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Douglas Gregor72c3f312008-12-05 18:15:24 +00001//===------- SemaTemplate.cpp - Semantic Analysis for C++ Templates -------===/
Douglas Gregor72c3f312008-12-05 18:15:24 +00002//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Douglas Gregor99ebf652009-02-27 19:31:52 +00007//===----------------------------------------------------------------------===/
Douglas Gregor72c3f312008-12-05 18:15:24 +00008//
9// This file implements semantic analysis for C++ templates.
Douglas Gregor99ebf652009-02-27 19:31:52 +000010//===----------------------------------------------------------------------===/
Douglas Gregor72c3f312008-12-05 18:15:24 +000011
John McCall2d887082010-08-25 22:03:47 +000012#include "clang/Sema/SemaInternal.h"
Douglas Gregore737f502010-08-12 20:07:10 +000013#include "clang/Sema/Lookup.h"
John McCall5f1e0942010-08-24 08:50:51 +000014#include "clang/Sema/Scope.h"
John McCall7cd088e2010-08-24 07:21:54 +000015#include "clang/Sema/Template.h"
John McCall2a7fb272010-08-25 05:32:35 +000016#include "clang/Sema/TemplateDeduction.h"
Douglas Gregor4a959d82009-08-06 16:20:37 +000017#include "TreeTransform.h"
Douglas Gregorddc29e12009-02-06 22:42:48 +000018#include "clang/AST/ASTContext.h"
Douglas Gregor898574e2008-12-05 23:32:09 +000019#include "clang/AST/Expr.h"
Douglas Gregorcc45cb32009-02-11 19:52:55 +000020#include "clang/AST/ExprCXX.h"
John McCall92b7f702010-03-11 07:50:04 +000021#include "clang/AST/DeclFriend.h"
Douglas Gregoraaba5e32009-02-04 19:02:06 +000022#include "clang/AST/DeclTemplate.h"
John McCall4e2cbb22010-10-20 05:44:58 +000023#include "clang/AST/RecursiveASTVisitor.h"
Douglas Gregor5f3aeb62010-10-13 00:27:52 +000024#include "clang/AST/TypeVisitor.h"
John McCall19510852010-08-20 18:27:03 +000025#include "clang/Sema/DeclSpec.h"
26#include "clang/Sema/ParsedTemplate.h"
Douglas Gregor72c3f312008-12-05 18:15:24 +000027#include "clang/Basic/LangOptions.h"
Douglas Gregord5a423b2009-09-25 18:43:00 +000028#include "clang/Basic/PartialDiagnostic.h"
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();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000259 assert((isDependent || !ObjectType->isIncompleteType()) &&
John McCallf7a1a742009-11-24 19:00:30 +0000260 "Caller should have completed object type");
Douglas Gregor1d7049a2012-01-12 16:11:24 +0000261
262 // Template names cannot appear inside an Objective-C class or object type.
263 if (ObjectType->isObjCObjectOrInterfaceType()) {
264 Found.clear();
265 return;
266 }
John McCallf7a1a742009-11-24 19:00:30 +0000267 } else if (SS.isSet()) {
268 // This nested-name-specifier occurs after another nested-name-specifier,
269 // so long into the context associated with the prior nested-name-specifier.
270 LookupCtx = computeDeclContext(SS, EnteringContext);
271 isDependent = isDependentScopeSpecifier(SS);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000272
John McCallf7a1a742009-11-24 19:00:30 +0000273 // The declaration context must be complete.
John McCall77bb1aa2010-05-01 00:40:08 +0000274 if (LookupCtx && RequireCompleteDeclContext(SS, LookupCtx))
John McCallf7a1a742009-11-24 19:00:30 +0000275 return;
276 }
277
278 bool ObjectTypeSearchedInScope = false;
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000279 bool AllowFunctionTemplatesInLookup = true;
John McCallf7a1a742009-11-24 19:00:30 +0000280 if (LookupCtx) {
281 // Perform "qualified" name lookup into the declaration context we
282 // computed, which is either the type of the base of a member access
283 // expression or the declaration context associated with a prior
284 // nested-name-specifier.
285 LookupQualifiedName(Found, LookupCtx);
John McCallf7a1a742009-11-24 19:00:30 +0000286 if (!ObjectType.isNull() && Found.empty()) {
287 // C++ [basic.lookup.classref]p1:
288 // In a class member access expression (5.2.5), if the . or -> token is
289 // immediately followed by an identifier followed by a <, the
290 // identifier must be looked up to determine whether the < is the
291 // beginning of a template argument list (14.2) or a less-than operator.
292 // The identifier is first looked up in the class of the object
293 // expression. If the identifier is not found, it is then looked up in
294 // the context of the entire postfix-expression and shall name a class
295 // or function template.
John McCallf7a1a742009-11-24 19:00:30 +0000296 if (S) LookupName(Found, S);
297 ObjectTypeSearchedInScope = true;
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000298 AllowFunctionTemplatesInLookup = false;
John McCallf7a1a742009-11-24 19:00:30 +0000299 }
Douglas Gregorf9f97a02010-07-16 16:54:17 +0000300 } else if (isDependent && (!S || ObjectType.isNull())) {
Douglas Gregor2e933882010-01-12 17:06:20 +0000301 // We cannot look into a dependent object type or nested nme
302 // specifier.
Douglas Gregor1fd6d442010-05-21 23:18:07 +0000303 MemberOfUnknownSpecialization = true;
John McCallf7a1a742009-11-24 19:00:30 +0000304 return;
305 } else {
306 // Perform unqualified name lookup in the current scope.
307 LookupName(Found, S);
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000308
309 if (!ObjectType.isNull())
310 AllowFunctionTemplatesInLookup = false;
John McCallf7a1a742009-11-24 19:00:30 +0000311 }
312
Douglas Gregor2e933882010-01-12 17:06:20 +0000313 if (Found.empty() && !isDependent) {
Douglas Gregorbfea2392009-12-31 08:11:17 +0000314 // If we did not find any names, attempt to correct any typos.
315 DeclarationName Name = Found.getLookupName();
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000316 Found.clear();
Kaelyn Uhrainf8ec8c92012-01-13 23:10:36 +0000317 // Simple filter callback that, for keywords, only accepts the C++ *_cast
318 CorrectionCandidateCallback FilterCCC;
319 FilterCCC.WantTypeSpecifiers = false;
320 FilterCCC.WantExpressionKeywords = false;
321 FilterCCC.WantRemainingKeywords = false;
322 FilterCCC.WantCXXNamedCasts = true;
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000323 if (TypoCorrection Corrected = CorrectTypo(Found.getLookupNameInfo(),
324 Found.getLookupKind(), S, &SS,
Kaelyn Uhrain16e46dd2012-01-31 23:49:25 +0000325 FilterCCC, LookupCtx)) {
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000326 Found.setLookupName(Corrected.getCorrection());
327 if (Corrected.getCorrectionDecl())
328 Found.addDecl(Corrected.getCorrectionDecl());
Douglas Gregor312eadb2011-04-24 05:37:28 +0000329 FilterAcceptableTemplateNames(Found);
John McCallad00b772010-06-16 08:42:20 +0000330 if (!Found.empty()) {
David Blaikie4e4d0842012-03-11 07:00:24 +0000331 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
332 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts()));
Douglas Gregorbfea2392009-12-31 08:11:17 +0000333 if (LookupCtx)
334 Diag(Found.getNameLoc(), diag::err_no_member_template_suggest)
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000335 << Name << LookupCtx << CorrectedQuotedStr << SS.getRange()
336 << FixItHint::CreateReplacement(Found.getNameLoc(), CorrectedStr);
Douglas Gregorbfea2392009-12-31 08:11:17 +0000337 else
338 Diag(Found.getNameLoc(), diag::err_no_template_suggest)
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000339 << Name << CorrectedQuotedStr
340 << FixItHint::CreateReplacement(Found.getNameLoc(), CorrectedStr);
Douglas Gregor67dd1d42010-01-07 00:17:44 +0000341 if (TemplateDecl *Template = Found.getAsSingle<TemplateDecl>())
342 Diag(Template->getLocation(), diag::note_previous_decl)
Douglas Gregord8bba9c2011-06-28 16:20:02 +0000343 << CorrectedQuotedStr;
John McCallad00b772010-06-16 08:42:20 +0000344 }
Douglas Gregorbfea2392009-12-31 08:11:17 +0000345 } else {
Douglas Gregor12eb5d62010-06-29 19:27:42 +0000346 Found.setLookupName(Name);
Douglas Gregorbfea2392009-12-31 08:11:17 +0000347 }
348 }
349
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000350 FilterAcceptableTemplateNames(Found, AllowFunctionTemplatesInLookup);
Douglas Gregorf9f97a02010-07-16 16:54:17 +0000351 if (Found.empty()) {
352 if (isDependent)
353 MemberOfUnknownSpecialization = true;
John McCallf7a1a742009-11-24 19:00:30 +0000354 return;
Douglas Gregorf9f97a02010-07-16 16:54:17 +0000355 }
John McCallf7a1a742009-11-24 19:00:30 +0000356
357 if (S && !ObjectType.isNull() && !ObjectTypeSearchedInScope) {
358 // C++ [basic.lookup.classref]p1:
359 // [...] If the lookup in the class of the object expression finds a
360 // template, the name is also looked up in the context of the entire
361 // postfix-expression and [...]
362 //
363 LookupResult FoundOuter(*this, Found.getLookupName(), Found.getNameLoc(),
364 LookupOrdinaryName);
365 LookupName(FoundOuter, S);
Douglas Gregor5a7a5bb2012-03-10 23:52:41 +0000366 FilterAcceptableTemplateNames(FoundOuter, /*AllowFunctionTemplates=*/false);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000367
John McCallf7a1a742009-11-24 19:00:30 +0000368 if (FoundOuter.empty()) {
369 // - if the name is not found, the name found in the class of the
370 // object expression is used, otherwise
Douglas Gregora6d1e762011-08-10 21:59:45 +0000371 } else if (!FoundOuter.getAsSingle<ClassTemplateDecl>() ||
372 FoundOuter.isAmbiguous()) {
John McCallf7a1a742009-11-24 19:00:30 +0000373 // - if the name is found in the context of the entire
374 // postfix-expression and does not name a class template, the name
375 // found in the class of the object expression is used, otherwise
Douglas Gregora6d1e762011-08-10 21:59:45 +0000376 FoundOuter.clear();
John McCallad00b772010-06-16 08:42:20 +0000377 } else if (!Found.isSuppressingDiagnostics()) {
John McCallf7a1a742009-11-24 19:00:30 +0000378 // - if the name found is a class template, it must refer to the same
379 // entity as the one found in the class of the object expression,
380 // otherwise the program is ill-formed.
381 if (!Found.isSingleResult() ||
382 Found.getFoundDecl()->getCanonicalDecl()
383 != FoundOuter.getFoundDecl()->getCanonicalDecl()) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000384 Diag(Found.getNameLoc(),
Jeffrey Yasskin21d07e42010-06-05 01:39:57 +0000385 diag::ext_nested_name_member_ref_lookup_ambiguous)
386 << Found.getLookupName()
387 << ObjectType;
John McCallf7a1a742009-11-24 19:00:30 +0000388 Diag(Found.getRepresentativeDecl()->getLocation(),
389 diag::note_ambig_member_ref_object_type)
390 << ObjectType;
391 Diag(FoundOuter.getFoundDecl()->getLocation(),
392 diag::note_ambig_member_ref_scope);
393
394 // Recover by taking the template that we found in the object
395 // expression's type.
396 }
397 }
398 }
399}
400
John McCall2f841ba2009-12-02 03:53:29 +0000401/// ActOnDependentIdExpression - Handle a dependent id-expression that
402/// was just parsed. This is only possible with an explicit scope
403/// specifier naming a dependent type.
John McCall60d7b3a2010-08-24 06:29:42 +0000404ExprResult
John McCallf7a1a742009-11-24 19:00:30 +0000405Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS,
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000406 SourceLocation TemplateKWLoc,
Abramo Bagnara25777432010-08-11 22:01:17 +0000407 const DeclarationNameInfo &NameInfo,
John McCall2f841ba2009-12-02 03:53:29 +0000408 bool isAddressOfOperand,
John McCallf7a1a742009-11-24 19:00:30 +0000409 const TemplateArgumentListInfo *TemplateArgs) {
John McCallea1471e2010-05-20 01:18:31 +0000410 DeclContext *DC = getFunctionLevelDeclContext();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000411
John McCall2f841ba2009-12-02 03:53:29 +0000412 if (!isAddressOfOperand &&
John McCallea1471e2010-05-20 01:18:31 +0000413 isa<CXXMethodDecl>(DC) &&
414 cast<CXXMethodDecl>(DC)->isInstance()) {
415 QualType ThisType = cast<CXXMethodDecl>(DC)->getThisType(Context);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000416
John McCallf7a1a742009-11-24 19:00:30 +0000417 // Since the 'this' expression is synthesized, we don't need to
418 // perform the double-lookup check.
419 NamedDecl *FirstQualifierInScope = 0;
420
John McCallaa81e162009-12-01 22:10:20 +0000421 return Owned(CXXDependentScopeMemberExpr::Create(Context,
422 /*This*/ 0, ThisType,
423 /*IsArrow*/ true,
John McCallf7a1a742009-11-24 19:00:30 +0000424 /*Op*/ SourceLocation(),
Douglas Gregor7c3179c2011-02-28 18:50:33 +0000425 SS.getWithLocInContext(Context),
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000426 TemplateKWLoc,
John McCallf7a1a742009-11-24 19:00:30 +0000427 FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +0000428 NameInfo,
John McCallf7a1a742009-11-24 19:00:30 +0000429 TemplateArgs));
430 }
431
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000432 return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs);
John McCallf7a1a742009-11-24 19:00:30 +0000433}
434
John McCall60d7b3a2010-08-24 06:29:42 +0000435ExprResult
John McCallf7a1a742009-11-24 19:00:30 +0000436Sema::BuildDependentDeclRefExpr(const CXXScopeSpec &SS,
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000437 SourceLocation TemplateKWLoc,
Abramo Bagnara25777432010-08-11 22:01:17 +0000438 const DeclarationNameInfo &NameInfo,
John McCallf7a1a742009-11-24 19:00:30 +0000439 const TemplateArgumentListInfo *TemplateArgs) {
440 return Owned(DependentScopeDeclRefExpr::Create(Context,
Douglas Gregor00cf3cc2011-02-25 20:49:16 +0000441 SS.getWithLocInContext(Context),
Abramo Bagnarae4b92762012-01-27 09:46:47 +0000442 TemplateKWLoc,
Abramo Bagnara25777432010-08-11 22:01:17 +0000443 NameInfo,
John McCallf7a1a742009-11-24 19:00:30 +0000444 TemplateArgs));
Douglas Gregord6fb7ef2008-12-18 19:37:40 +0000445}
446
Douglas Gregor72c3f312008-12-05 18:15:24 +0000447/// DiagnoseTemplateParameterShadow - Produce a diagnostic complaining
448/// that the template parameter 'PrevDecl' is being shadowed by a new
449/// declaration at location Loc. Returns true to indicate that this is
450/// an error, and false otherwise.
Douglas Gregorcb8f9512011-10-20 17:58:49 +0000451void Sema::DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl) {
Douglas Gregorf57172b2008-12-08 18:40:42 +0000452 assert(PrevDecl->isTemplateParameter() && "Not a template parameter");
Douglas Gregor72c3f312008-12-05 18:15:24 +0000453
454 // Microsoft Visual C++ permits template parameters to be shadowed.
David Blaikie4e4d0842012-03-11 07:00:24 +0000455 if (getLangOpts().MicrosoftExt)
Douglas Gregorcb8f9512011-10-20 17:58:49 +0000456 return;
Douglas Gregor72c3f312008-12-05 18:15:24 +0000457
458 // C++ [temp.local]p4:
459 // A template-parameter shall not be redeclared within its
460 // scope (including nested scopes).
Mike Stump1eb44332009-09-09 15:08:12 +0000461 Diag(Loc, diag::err_template_param_shadow)
Douglas Gregor72c3f312008-12-05 18:15:24 +0000462 << cast<NamedDecl>(PrevDecl)->getDeclName();
463 Diag(PrevDecl->getLocation(), diag::note_template_param_here);
Douglas Gregorcb8f9512011-10-20 17:58:49 +0000464 return;
Douglas Gregor72c3f312008-12-05 18:15:24 +0000465}
466
Douglas Gregor2943aed2009-03-03 04:44:36 +0000467/// AdjustDeclIfTemplate - If the given decl happens to be a template, reset
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000468/// the parameter D to reference the templated declaration and return a pointer
469/// to the template declaration. Otherwise, do nothing to D and return null.
John McCalld226f652010-08-21 09:40:31 +0000470TemplateDecl *Sema::AdjustDeclIfTemplate(Decl *&D) {
471 if (TemplateDecl *Temp = dyn_cast_or_null<TemplateDecl>(D)) {
472 D = Temp->getTemplatedDecl();
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000473 return Temp;
474 }
475 return 0;
476}
477
Douglas Gregorba68eca2011-01-05 17:40:24 +0000478ParsedTemplateArgument ParsedTemplateArgument::getTemplatePackExpansion(
479 SourceLocation EllipsisLoc) const {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000480 assert(Kind == Template &&
Douglas Gregorba68eca2011-01-05 17:40:24 +0000481 "Only template template arguments can be pack expansions here");
482 assert(getAsTemplate().get().containsUnexpandedParameterPack() &&
483 "Template template argument pack expansion without packs");
484 ParsedTemplateArgument Result(*this);
485 Result.EllipsisLoc = EllipsisLoc;
486 return Result;
487}
488
Douglas Gregor788cd062009-11-11 01:00:40 +0000489static TemplateArgumentLoc translateTemplateArgument(Sema &SemaRef,
490 const ParsedTemplateArgument &Arg) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000491
Douglas Gregor788cd062009-11-11 01:00:40 +0000492 switch (Arg.getKind()) {
493 case ParsedTemplateArgument::Type: {
John McCalla93c9342009-12-07 02:54:59 +0000494 TypeSourceInfo *DI;
Douglas Gregor788cd062009-11-11 01:00:40 +0000495 QualType T = SemaRef.GetTypeFromParser(Arg.getAsType(), &DI);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000496 if (!DI)
John McCalla93c9342009-12-07 02:54:59 +0000497 DI = SemaRef.Context.getTrivialTypeSourceInfo(T, Arg.getLocation());
Douglas Gregor788cd062009-11-11 01:00:40 +0000498 return TemplateArgumentLoc(TemplateArgument(T), DI);
499 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000500
Douglas Gregor788cd062009-11-11 01:00:40 +0000501 case ParsedTemplateArgument::NonType: {
502 Expr *E = static_cast<Expr *>(Arg.getAsExpr());
503 return TemplateArgumentLoc(TemplateArgument(E), E);
504 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000505
Douglas Gregor788cd062009-11-11 01:00:40 +0000506 case ParsedTemplateArgument::Template: {
John McCall2b5289b2010-08-23 07:28:44 +0000507 TemplateName Template = Arg.getAsTemplate().get();
Douglas Gregor2be29f42011-01-14 23:41:42 +0000508 TemplateArgument TArg;
509 if (Arg.getEllipsisLoc().isValid())
510 TArg = TemplateArgument(Template, llvm::Optional<unsigned int>());
511 else
512 TArg = Template;
513 return TemplateArgumentLoc(TArg,
Douglas Gregorb6744ef2011-03-02 17:09:35 +0000514 Arg.getScopeSpec().getWithLocInContext(
515 SemaRef.Context),
Douglas Gregorba68eca2011-01-05 17:40:24 +0000516 Arg.getLocation(),
517 Arg.getEllipsisLoc());
Douglas Gregor788cd062009-11-11 01:00:40 +0000518 }
519 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000520
Jeffrey Yasskin9f61aa92009-12-12 05:05:38 +0000521 llvm_unreachable("Unhandled parsed template argument");
Douglas Gregor788cd062009-11-11 01:00:40 +0000522}
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000523
Douglas Gregor788cd062009-11-11 01:00:40 +0000524/// \brief Translates template arguments as provided by the parser
525/// into template arguments used by semantic analysis.
John McCalld5532b62009-11-23 01:53:49 +0000526void Sema::translateTemplateArguments(const ASTTemplateArgsPtr &TemplateArgsIn,
527 TemplateArgumentListInfo &TemplateArgs) {
Douglas Gregor788cd062009-11-11 01:00:40 +0000528 for (unsigned I = 0, Last = TemplateArgsIn.size(); I != Last; ++I)
John McCalld5532b62009-11-23 01:53:49 +0000529 TemplateArgs.addArgument(translateTemplateArgument(*this,
530 TemplateArgsIn[I]));
Douglas Gregor788cd062009-11-11 01:00:40 +0000531}
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000532
Douglas Gregor72c3f312008-12-05 18:15:24 +0000533/// ActOnTypeParameter - Called when a C++ template type parameter
534/// (e.g., "typename T") has been parsed. Typename specifies whether
535/// the keyword "typename" was used to declare the type parameter
536/// (otherwise, "class" was used), and KeyLoc is the location of the
537/// "class" or "typename" keyword. ParamName is the name of the
538/// parameter (NULL indicates an unnamed template parameter) and
Chandler Carruth4fb86f82011-05-01 00:51:33 +0000539/// ParamNameLoc is the location of the parameter name (if any).
Douglas Gregor72c3f312008-12-05 18:15:24 +0000540/// If the type parameter has a default argument, it will be added
541/// later via ActOnTypeParameterDefault.
John McCalld226f652010-08-21 09:40:31 +0000542Decl *Sema::ActOnTypeParameter(Scope *S, bool Typename, bool Ellipsis,
543 SourceLocation EllipsisLoc,
544 SourceLocation KeyLoc,
545 IdentifierInfo *ParamName,
546 SourceLocation ParamNameLoc,
547 unsigned Depth, unsigned Position,
548 SourceLocation EqualLoc,
John McCallb3d87482010-08-24 05:47:05 +0000549 ParsedType DefaultArg) {
Mike Stump1eb44332009-09-09 15:08:12 +0000550 assert(S->isTemplateParamScope() &&
551 "Template type parameter not in template parameter scope!");
Douglas Gregor72c3f312008-12-05 18:15:24 +0000552 bool Invalid = false;
553
554 if (ParamName) {
Douglas Gregorc83c6872010-04-15 22:33:43 +0000555 NamedDecl *PrevDecl = LookupSingleName(S, ParamName, ParamNameLoc,
Douglas Gregorc0b39642010-04-15 23:40:53 +0000556 LookupOrdinaryName,
557 ForRedeclaration);
Douglas Gregorcb8f9512011-10-20 17:58:49 +0000558 if (PrevDecl && PrevDecl->isTemplateParameter()) {
559 DiagnoseTemplateParameterShadow(ParamNameLoc, PrevDecl);
560 PrevDecl = 0;
561 }
Douglas Gregor72c3f312008-12-05 18:15:24 +0000562 }
563
Douglas Gregorddc29e12009-02-06 22:42:48 +0000564 SourceLocation Loc = ParamNameLoc;
565 if (!ParamName)
566 Loc = KeyLoc;
567
Douglas Gregor72c3f312008-12-05 18:15:24 +0000568 TemplateTypeParmDecl *Param
John McCall7a9813c2010-01-22 00:28:27 +0000569 = TemplateTypeParmDecl::Create(Context, Context.getTranslationUnitDecl(),
Abramo Bagnara344577e2011-03-06 15:48:19 +0000570 KeyLoc, Loc, Depth, Position, ParamName,
571 Typename, Ellipsis);
Douglas Gregor9a299e02011-03-04 17:52:15 +0000572 Param->setAccess(AS_public);
Douglas Gregor72c3f312008-12-05 18:15:24 +0000573 if (Invalid)
574 Param->setInvalidDecl();
575
576 if (ParamName) {
577 // Add the template parameter into the current scope.
John McCalld226f652010-08-21 09:40:31 +0000578 S->AddDecl(Param);
Douglas Gregor72c3f312008-12-05 18:15:24 +0000579 IdResolver.AddDecl(Param);
580 }
581
Douglas Gregor61c4d282011-01-05 15:48:55 +0000582 // C++0x [temp.param]p9:
583 // A default template-argument may be specified for any kind of
584 // template-parameter that is not a template parameter pack.
585 if (DefaultArg && Ellipsis) {
586 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
587 DefaultArg = ParsedType();
588 }
589
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000590 // Handle the default argument, if provided.
591 if (DefaultArg) {
592 TypeSourceInfo *DefaultTInfo;
593 GetTypeFromParser(DefaultArg, &DefaultTInfo);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000594
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000595 assert(DefaultTInfo && "expected source information for type");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000596
Douglas Gregor6f526752010-12-16 08:48:57 +0000597 // Check for unexpanded parameter packs.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000598 if (DiagnoseUnexpandedParameterPack(Loc, DefaultTInfo,
Douglas Gregor6f526752010-12-16 08:48:57 +0000599 UPPC_DefaultArgument))
600 return Param;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000601
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000602 // Check the template argument itself.
603 if (CheckTemplateArgument(Param, DefaultTInfo)) {
604 Param->setInvalidDecl();
John McCalld226f652010-08-21 09:40:31 +0000605 return Param;
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000606 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000607
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000608 Param->setDefaultArgument(DefaultTInfo, false);
609 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000610
John McCalld226f652010-08-21 09:40:31 +0000611 return Param;
Douglas Gregor72c3f312008-12-05 18:15:24 +0000612}
613
Douglas Gregor2943aed2009-03-03 04:44:36 +0000614/// \brief Check that the type of a non-type template parameter is
615/// well-formed.
616///
617/// \returns the (possibly-promoted) parameter type if valid;
618/// otherwise, produces a diagnostic and returns a NULL type.
Mike Stump1eb44332009-09-09 15:08:12 +0000619QualType
Douglas Gregor2943aed2009-03-03 04:44:36 +0000620Sema::CheckNonTypeTemplateParameterType(QualType T, SourceLocation Loc) {
Douglas Gregora481ec42010-05-23 19:57:01 +0000621 // We don't allow variably-modified types as the type of non-type template
622 // parameters.
623 if (T->isVariablyModifiedType()) {
624 Diag(Loc, diag::err_variably_modified_nontype_template_param)
625 << T;
626 return QualType();
627 }
628
Douglas Gregor2943aed2009-03-03 04:44:36 +0000629 // C++ [temp.param]p4:
630 //
631 // A non-type template-parameter shall have one of the following
632 // (optionally cv-qualified) types:
633 //
634 // -- integral or enumeration type,
Douglas Gregor2ade35e2010-06-16 00:17:44 +0000635 if (T->isIntegralOrEnumerationType() ||
Mike Stump1eb44332009-09-09 15:08:12 +0000636 // -- pointer to object or pointer to function,
Eli Friedman13578692010-08-05 02:49:48 +0000637 T->isPointerType() ||
Mike Stump1eb44332009-09-09 15:08:12 +0000638 // -- reference to object or reference to function,
Douglas Gregor2943aed2009-03-03 04:44:36 +0000639 T->isReferenceType() ||
Douglas Gregor84ee2ee2011-05-21 23:15:46 +0000640 // -- pointer to member,
Douglas Gregor2943aed2009-03-03 04:44:36 +0000641 T->isMemberPointerType() ||
Douglas Gregor84ee2ee2011-05-21 23:15:46 +0000642 // -- std::nullptr_t.
643 T->isNullPtrType() ||
Douglas Gregor2943aed2009-03-03 04:44:36 +0000644 // If T is a dependent type, we can't do the check now, so we
645 // assume that it is well-formed.
Richard Smithe37f4842012-03-13 07:21:50 +0000646 T->isDependentType()) {
647 // C++ [temp.param]p5: The top-level cv-qualifiers on the template-parameter
648 // are ignored when determining its type.
649 return T.getUnqualifiedType();
650 }
651
Douglas Gregor2943aed2009-03-03 04:44:36 +0000652 // C++ [temp.param]p8:
653 //
654 // A non-type template-parameter of type "array of T" or
655 // "function returning T" is adjusted to be of type "pointer to
656 // T" or "pointer to function returning T", respectively.
657 else if (T->isArrayType())
658 // FIXME: Keep the type prior to promotion?
659 return Context.getArrayDecayedType(T);
660 else if (T->isFunctionType())
661 // FIXME: Keep the type prior to promotion?
662 return Context.getPointerType(T);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000663
Douglas Gregor2943aed2009-03-03 04:44:36 +0000664 Diag(Loc, diag::err_template_nontype_parm_bad_type)
665 << T;
666
667 return QualType();
668}
669
John McCalld226f652010-08-21 09:40:31 +0000670Decl *Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
671 unsigned Depth,
672 unsigned Position,
673 SourceLocation EqualLoc,
John McCall9ae2f072010-08-23 23:25:46 +0000674 Expr *Default) {
John McCallbf1a0282010-06-04 23:28:52 +0000675 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
676 QualType T = TInfo->getType();
Douglas Gregor72c3f312008-12-05 18:15:24 +0000677
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000678 assert(S->isTemplateParamScope() &&
679 "Non-type template parameter not in template parameter scope!");
Douglas Gregor72c3f312008-12-05 18:15:24 +0000680 bool Invalid = false;
681
682 IdentifierInfo *ParamName = D.getIdentifier();
683 if (ParamName) {
Douglas Gregorc83c6872010-04-15 22:33:43 +0000684 NamedDecl *PrevDecl = LookupSingleName(S, ParamName, D.getIdentifierLoc(),
Douglas Gregorc0b39642010-04-15 23:40:53 +0000685 LookupOrdinaryName,
686 ForRedeclaration);
Douglas Gregorcb8f9512011-10-20 17:58:49 +0000687 if (PrevDecl && PrevDecl->isTemplateParameter()) {
688 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
689 PrevDecl = 0;
690 }
Douglas Gregor72c3f312008-12-05 18:15:24 +0000691 }
692
Douglas Gregor4d2abba2010-12-16 15:36:43 +0000693 T = CheckNonTypeTemplateParameterType(T, D.getIdentifierLoc());
694 if (T.isNull()) {
Douglas Gregor2943aed2009-03-03 04:44:36 +0000695 T = Context.IntTy; // Recover with an 'int' type.
Douglas Gregorceef30c2009-03-09 16:46:39 +0000696 Invalid = true;
697 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000698
Douglas Gregor10738d32010-12-23 23:51:58 +0000699 bool IsParameterPack = D.hasEllipsis();
Douglas Gregor72c3f312008-12-05 18:15:24 +0000700 NonTypeTemplateParmDecl *Param
John McCall7a9813c2010-01-22 00:28:27 +0000701 = NonTypeTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(),
Daniel Dunbar96a00142012-03-09 18:35:03 +0000702 D.getLocStart(),
John McCall7a9813c2010-01-22 00:28:27 +0000703 D.getIdentifierLoc(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000704 Depth, Position, ParamName, T,
Douglas Gregor10738d32010-12-23 23:51:58 +0000705 IsParameterPack, TInfo);
Douglas Gregor9a299e02011-03-04 17:52:15 +0000706 Param->setAccess(AS_public);
707
Douglas Gregor72c3f312008-12-05 18:15:24 +0000708 if (Invalid)
709 Param->setInvalidDecl();
710
711 if (D.getIdentifier()) {
712 // Add the template parameter into the current scope.
John McCalld226f652010-08-21 09:40:31 +0000713 S->AddDecl(Param);
Douglas Gregor72c3f312008-12-05 18:15:24 +0000714 IdResolver.AddDecl(Param);
715 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000716
Douglas Gregor61c4d282011-01-05 15:48:55 +0000717 // C++0x [temp.param]p9:
718 // A default template-argument may be specified for any kind of
719 // template-parameter that is not a template parameter pack.
720 if (Default && IsParameterPack) {
721 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
722 Default = 0;
723 }
724
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000725 // Check the well-formedness of the default template argument, if provided.
Douglas Gregor10738d32010-12-23 23:51:58 +0000726 if (Default) {
Douglas Gregor6f526752010-12-16 08:48:57 +0000727 // Check for unexpanded parameter packs.
728 if (DiagnoseUnexpandedParameterPack(Default, UPPC_DefaultArgument))
729 return Param;
730
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000731 TemplateArgument Converted;
John Wiegley429bb272011-04-08 18:41:53 +0000732 ExprResult DefaultRes = CheckTemplateArgument(Param, Param->getType(), Default, Converted);
733 if (DefaultRes.isInvalid()) {
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000734 Param->setInvalidDecl();
John McCalld226f652010-08-21 09:40:31 +0000735 return Param;
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000736 }
John Wiegley429bb272011-04-08 18:41:53 +0000737 Default = DefaultRes.take();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000738
John McCall9ae2f072010-08-23 23:25:46 +0000739 Param->setDefaultArgument(Default, false);
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000740 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000741
John McCalld226f652010-08-21 09:40:31 +0000742 return Param;
Douglas Gregor72c3f312008-12-05 18:15:24 +0000743}
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000744
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000745/// ActOnTemplateTemplateParameter - Called when a C++ template template
746/// parameter (e.g. T in template <template <typename> class T> class array)
747/// has been parsed. S is the current scope.
John McCalld226f652010-08-21 09:40:31 +0000748Decl *Sema::ActOnTemplateTemplateParameter(Scope* S,
749 SourceLocation TmpLoc,
Richard Trieu90ab75b2011-09-09 03:18:59 +0000750 TemplateParameterList *Params,
Douglas Gregor61c4d282011-01-05 15:48:55 +0000751 SourceLocation EllipsisLoc,
John McCalld226f652010-08-21 09:40:31 +0000752 IdentifierInfo *Name,
753 SourceLocation NameLoc,
754 unsigned Depth,
755 unsigned Position,
756 SourceLocation EqualLoc,
Douglas Gregor61c4d282011-01-05 15:48:55 +0000757 ParsedTemplateArgument Default) {
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000758 assert(S->isTemplateParamScope() &&
759 "Template template parameter not in template parameter scope!");
760
761 // Construct the parameter object.
Douglas Gregor61c4d282011-01-05 15:48:55 +0000762 bool IsParameterPack = EllipsisLoc.isValid();
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000763 TemplateTemplateParmDecl *Param =
John McCall7a9813c2010-01-22 00:28:27 +0000764 TemplateTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000765 NameLoc.isInvalid()? TmpLoc : NameLoc,
766 Depth, Position, IsParameterPack,
Douglas Gregor61c4d282011-01-05 15:48:55 +0000767 Name, Params);
Douglas Gregor9a299e02011-03-04 17:52:15 +0000768 Param->setAccess(AS_public);
769
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000770 // If the template template parameter has a name, then link the identifier
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000771 // into the scope and lookup mechanisms.
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000772 if (Name) {
John McCalld226f652010-08-21 09:40:31 +0000773 S->AddDecl(Param);
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000774 IdResolver.AddDecl(Param);
775 }
776
Douglas Gregor6f526752010-12-16 08:48:57 +0000777 if (Params->size() == 0) {
778 Diag(Param->getLocation(), diag::err_template_template_parm_no_parms)
779 << SourceRange(Params->getLAngleLoc(), Params->getRAngleLoc());
780 Param->setInvalidDecl();
781 }
782
Douglas Gregor61c4d282011-01-05 15:48:55 +0000783 // C++0x [temp.param]p9:
784 // A default template-argument may be specified for any kind of
785 // template-parameter that is not a template parameter pack.
786 if (IsParameterPack && !Default.isInvalid()) {
787 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
788 Default = ParsedTemplateArgument();
789 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000790
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000791 if (!Default.isInvalid()) {
792 // Check only that we have a template template argument. We don't want to
793 // try to check well-formedness now, because our template template parameter
794 // might have dependent types in its template parameters, which we wouldn't
795 // be able to match now.
796 //
797 // If none of the template template parameter's template arguments mention
798 // other template parameters, we could actually perform more checking here.
799 // However, it isn't worth doing.
800 TemplateArgumentLoc DefaultArg = translateTemplateArgument(*this, Default);
801 if (DefaultArg.getArgument().getAsTemplate().isNull()) {
802 Diag(DefaultArg.getLocation(), diag::err_template_arg_not_class_template)
803 << DefaultArg.getSourceRange();
John McCalld226f652010-08-21 09:40:31 +0000804 return Param;
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000805 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000806
Douglas Gregor6f526752010-12-16 08:48:57 +0000807 // Check for unexpanded parameter packs.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000808 if (DiagnoseUnexpandedParameterPack(DefaultArg.getLocation(),
Douglas Gregor6f526752010-12-16 08:48:57 +0000809 DefaultArg.getArgument().getAsTemplate(),
810 UPPC_DefaultArgument))
811 return Param;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000812
Douglas Gregorbb3310a2010-07-01 00:00:45 +0000813 Param->setDefaultArgument(DefaultArg, false);
Douglas Gregord684b002009-02-10 19:49:53 +0000814 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000815
John McCalld226f652010-08-21 09:40:31 +0000816 return Param;
Douglas Gregord684b002009-02-10 19:49:53 +0000817}
818
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000819/// ActOnTemplateParameterList - Builds a TemplateParameterList that
820/// contains the template parameters in Params/NumParams.
Richard Trieu90ab75b2011-09-09 03:18:59 +0000821TemplateParameterList *
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000822Sema::ActOnTemplateParameterList(unsigned Depth,
823 SourceLocation ExportLoc,
Mike Stump1eb44332009-09-09 15:08:12 +0000824 SourceLocation TemplateLoc,
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000825 SourceLocation LAngleLoc,
John McCalld226f652010-08-21 09:40:31 +0000826 Decl **Params, unsigned NumParams,
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000827 SourceLocation RAngleLoc) {
828 if (ExportLoc.isValid())
Douglas Gregor51ffb0c2009-11-25 18:55:14 +0000829 Diag(ExportLoc, diag::warn_template_export_unsupported);
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000830
Douglas Gregorddc29e12009-02-06 22:42:48 +0000831 return TemplateParameterList::Create(Context, TemplateLoc, LAngleLoc,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000832 (NamedDecl**)Params, NumParams,
Douglas Gregorbf4ea562009-09-15 16:23:51 +0000833 RAngleLoc);
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000834}
Douglas Gregoraaba5e32009-02-04 19:02:06 +0000835
John McCallb6217662010-03-15 10:12:16 +0000836static void SetNestedNameSpecifier(TagDecl *T, const CXXScopeSpec &SS) {
837 if (SS.isSet())
Douglas Gregorc22b5ff2011-02-25 02:25:35 +0000838 T->setQualifierInfo(SS.getWithLocInContext(T->getASTContext()));
John McCallb6217662010-03-15 10:12:16 +0000839}
840
John McCallf312b1e2010-08-26 23:41:50 +0000841DeclResult
John McCall0f434ec2009-07-31 02:45:11 +0000842Sema::CheckClassTemplate(Scope *S, unsigned TagSpec, TagUseKind TUK,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +0000843 SourceLocation KWLoc, CXXScopeSpec &SS,
Douglas Gregorddc29e12009-02-06 22:42:48 +0000844 IdentifierInfo *Name, SourceLocation NameLoc,
845 AttributeList *Attr,
Douglas Gregor05396e22009-08-25 17:23:04 +0000846 TemplateParameterList *TemplateParams,
Douglas Gregore7612302011-09-09 19:05:14 +0000847 AccessSpecifier AS, SourceLocation ModulePrivateLoc,
Abramo Bagnarac57c17d2011-03-10 13:28:31 +0000848 unsigned NumOuterTemplateParamLists,
849 TemplateParameterList** OuterTemplateParamLists) {
Mike Stump1eb44332009-09-09 15:08:12 +0000850 assert(TemplateParams && TemplateParams->size() > 0 &&
Douglas Gregor05396e22009-08-25 17:23:04 +0000851 "No template parameters");
John McCall0f434ec2009-07-31 02:45:11 +0000852 assert(TUK != TUK_Reference && "Can only declare or define class templates");
Douglas Gregord684b002009-02-10 19:49:53 +0000853 bool Invalid = false;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000854
855 // Check that we can declare a template here.
Douglas Gregor05396e22009-08-25 17:23:04 +0000856 if (CheckTemplateDeclScope(S, TemplateParams))
Douglas Gregor212e81c2009-03-25 00:13:59 +0000857 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000858
Abramo Bagnara465d41b2010-05-11 21:36:43 +0000859 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
860 assert(Kind != TTK_Enum && "can't build template of enumerated type");
Douglas Gregorddc29e12009-02-06 22:42:48 +0000861
862 // There is no such thing as an unnamed class template.
863 if (!Name) {
864 Diag(KWLoc, diag::err_template_unnamed_class);
Douglas Gregor212e81c2009-03-25 00:13:59 +0000865 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000866 }
867
Richard Smith71c598f2012-04-21 01:27:54 +0000868 // Find any previous declaration with this name. For a friend with no
869 // scope explicitly specified, we only look for tag declarations (per
870 // C++11 [basic.lookup.elab]p2).
Douglas Gregor05396e22009-08-25 17:23:04 +0000871 DeclContext *SemanticContext;
Richard Smith71c598f2012-04-21 01:27:54 +0000872 LookupResult Previous(*this, Name, NameLoc,
873 (SS.isEmpty() && TUK == TUK_Friend)
874 ? LookupTagName : LookupOrdinaryName,
John McCall7d384dd2009-11-18 07:57:50 +0000875 ForRedeclaration);
Douglas Gregor05396e22009-08-25 17:23:04 +0000876 if (SS.isNotEmpty() && !SS.isInvalid()) {
877 SemanticContext = computeDeclContext(SS, true);
878 if (!SemanticContext) {
Douglas Gregor8b0fa522012-03-30 16:20:47 +0000879 // FIXME: Horrible, horrible hack! We can't currently represent this
880 // in the AST, and historically we have just ignored such friend
881 // class templates, so don't complain here.
882 if (TUK != TUK_Friend)
883 Diag(NameLoc, diag::err_template_qualified_declarator_no_match)
884 << SS.getScopeRep() << SS.getRange();
Douglas Gregor05396e22009-08-25 17:23:04 +0000885 return true;
886 }
Mike Stump1eb44332009-09-09 15:08:12 +0000887
John McCall77bb1aa2010-05-01 00:40:08 +0000888 if (RequireCompleteDeclContext(SS, SemanticContext))
889 return true;
890
Douglas Gregor20606502011-10-14 15:31:12 +0000891 // If we're adding a template to a dependent context, we may need to
892 // rebuilding some of the types used within the template parameter list,
893 // now that we know what the current instantiation is.
894 if (SemanticContext->isDependentContext()) {
895 ContextRAII SavedContext(*this, SemanticContext);
896 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams))
897 Invalid = true;
Douglas Gregor69605872012-03-28 16:01:27 +0000898 } else if (TUK != TUK_Friend && TUK != TUK_Reference)
899 diagnoseQualifiedDeclaration(SS, SemanticContext, Name, NameLoc);
Richard Smith71c598f2012-04-21 01:27:54 +0000900
John McCalla24dc2e2009-11-17 02:14:36 +0000901 LookupQualifiedName(Previous, SemanticContext);
Douglas Gregor05396e22009-08-25 17:23:04 +0000902 } else {
903 SemanticContext = CurContext;
John McCalla24dc2e2009-11-17 02:14:36 +0000904 LookupName(Previous, S);
Douglas Gregor05396e22009-08-25 17:23:04 +0000905 }
Mike Stump1eb44332009-09-09 15:08:12 +0000906
Douglas Gregor57265e32010-04-12 16:00:01 +0000907 if (Previous.isAmbiguous())
908 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000909
Douglas Gregorddc29e12009-02-06 22:42:48 +0000910 NamedDecl *PrevDecl = 0;
911 if (Previous.begin() != Previous.end())
Douglas Gregor57265e32010-04-12 16:00:01 +0000912 PrevDecl = (*Previous.begin())->getUnderlyingDecl();
Douglas Gregorddc29e12009-02-06 22:42:48 +0000913
Douglas Gregorddc29e12009-02-06 22:42:48 +0000914 // If there is a previous declaration with the same name, check
915 // whether this is a valid redeclaration.
Mike Stump1eb44332009-09-09 15:08:12 +0000916 ClassTemplateDecl *PrevClassTemplate
Douglas Gregorddc29e12009-02-06 22:42:48 +0000917 = dyn_cast_or_null<ClassTemplateDecl>(PrevDecl);
Douglas Gregord7e5bdb2009-10-09 21:11:42 +0000918
919 // We may have found the injected-class-name of a class template,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000920 // class template partial specialization, or class template specialization.
Douglas Gregord7e5bdb2009-10-09 21:11:42 +0000921 // In these cases, grab the template that is being defined or specialized.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000922 if (!PrevClassTemplate && PrevDecl && isa<CXXRecordDecl>(PrevDecl) &&
Douglas Gregord7e5bdb2009-10-09 21:11:42 +0000923 cast<CXXRecordDecl>(PrevDecl)->isInjectedClassName()) {
924 PrevDecl = cast<CXXRecordDecl>(PrevDecl->getDeclContext());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000925 PrevClassTemplate
Douglas Gregord7e5bdb2009-10-09 21:11:42 +0000926 = cast<CXXRecordDecl>(PrevDecl)->getDescribedClassTemplate();
927 if (!PrevClassTemplate && isa<ClassTemplateSpecializationDecl>(PrevDecl)) {
928 PrevClassTemplate
929 = cast<ClassTemplateSpecializationDecl>(PrevDecl)
930 ->getSpecializedTemplate();
931 }
932 }
933
John McCall65c49462009-12-18 11:25:59 +0000934 if (TUK == TUK_Friend) {
John McCalle129d442009-12-17 23:21:11 +0000935 // C++ [namespace.memdef]p3:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000936 // [...] When looking for a prior declaration of a class or a function
937 // declared as a friend, and when the name of the friend class or
John McCalle129d442009-12-17 23:21:11 +0000938 // function is neither a qualified name nor a template-id, scopes outside
939 // the innermost enclosing namespace scope are not considered.
Douglas Gregorc1c9df72010-04-18 17:37:40 +0000940 if (!SS.isSet()) {
941 DeclContext *OutermostContext = CurContext;
942 while (!OutermostContext->isFileContext())
943 OutermostContext = OutermostContext->getLookupParent();
John McCall65c49462009-12-18 11:25:59 +0000944
Richard Smithc93e0142012-04-20 07:12:26 +0000945 if (PrevDecl &&
Douglas Gregorc1c9df72010-04-18 17:37:40 +0000946 (OutermostContext->Equals(PrevDecl->getDeclContext()) ||
947 OutermostContext->Encloses(PrevDecl->getDeclContext()))) {
948 SemanticContext = PrevDecl->getDeclContext();
949 } else {
950 // Declarations in outer scopes don't matter. However, the outermost
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000951 // context we computed is the semantic context for our new
Douglas Gregorc1c9df72010-04-18 17:37:40 +0000952 // declaration.
953 PrevDecl = PrevClassTemplate = 0;
954 SemanticContext = OutermostContext;
Richard Smith71c598f2012-04-21 01:27:54 +0000955
956 // Check that the chosen semantic context doesn't already contain a
957 // declaration of this name as a non-tag type.
958 LookupResult Previous(*this, Name, NameLoc, LookupOrdinaryName,
959 ForRedeclaration);
960 DeclContext *LookupContext = SemanticContext;
961 while (LookupContext->isTransparentContext())
962 LookupContext = LookupContext->getLookupParent();
963 LookupQualifiedName(Previous, LookupContext);
964
965 if (Previous.isAmbiguous())
966 return true;
967
968 if (Previous.begin() != Previous.end())
969 PrevDecl = (*Previous.begin())->getUnderlyingDecl();
Douglas Gregorc1c9df72010-04-18 17:37:40 +0000970 }
John McCalle129d442009-12-17 23:21:11 +0000971 }
John McCalle129d442009-12-17 23:21:11 +0000972 } else if (PrevDecl && !isDeclInScope(PrevDecl, SemanticContext, S))
973 PrevDecl = PrevClassTemplate = 0;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +0000974
Douglas Gregorddc29e12009-02-06 22:42:48 +0000975 if (PrevClassTemplate) {
Richard Smith6e21b162012-04-22 02:13:50 +0000976 // Ensure that the template parameter lists are compatible. Skip this check
977 // for a friend in a dependent context: the template parameter list itself
978 // could be dependent.
979 if (!(TUK == TUK_Friend && CurContext->isDependentContext()) &&
980 !TemplateParameterListsAreEqual(TemplateParams,
Douglas Gregorddc29e12009-02-06 22:42:48 +0000981 PrevClassTemplate->getTemplateParameters(),
Douglas Gregorfb898e12009-11-12 16:20:59 +0000982 /*Complain=*/true,
983 TPL_TemplateMatch))
Douglas Gregor212e81c2009-03-25 00:13:59 +0000984 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +0000985
986 // C++ [temp.class]p4:
987 // In a redeclaration, partial specialization, explicit
988 // specialization or explicit instantiation of a class template,
989 // the class-key shall agree in kind with the original class
990 // template declaration (7.1.5.3).
991 RecordDecl *PrevRecordDecl = PrevClassTemplate->getTemplatedDecl();
Richard Trieubbf34c02011-06-10 03:11:26 +0000992 if (!isAcceptableTagRedeclaration(PrevRecordDecl, Kind,
993 TUK == TUK_Definition, KWLoc, *Name)) {
Mike Stump1eb44332009-09-09 15:08:12 +0000994 Diag(KWLoc, diag::err_use_with_wrong_tag)
Douglas Gregora3a83512009-04-01 23:51:29 +0000995 << Name
Douglas Gregor849b2432010-03-31 17:46:05 +0000996 << FixItHint::CreateReplacement(KWLoc, PrevRecordDecl->getKindName());
Douglas Gregorddc29e12009-02-06 22:42:48 +0000997 Diag(PrevRecordDecl->getLocation(), diag::note_previous_use);
Douglas Gregora3a83512009-04-01 23:51:29 +0000998 Kind = PrevRecordDecl->getTagKind();
Douglas Gregorddc29e12009-02-06 22:42:48 +0000999 }
1000
Douglas Gregorddc29e12009-02-06 22:42:48 +00001001 // Check for redefinition of this class template.
John McCall0f434ec2009-07-31 02:45:11 +00001002 if (TUK == TUK_Definition) {
Douglas Gregor952b0172010-02-11 01:04:33 +00001003 if (TagDecl *Def = PrevRecordDecl->getDefinition()) {
Douglas Gregorddc29e12009-02-06 22:42:48 +00001004 Diag(NameLoc, diag::err_redefinition) << Name;
1005 Diag(Def->getLocation(), diag::note_previous_definition);
1006 // FIXME: Would it make sense to try to "forget" the previous
1007 // definition, as part of error recovery?
Douglas Gregor212e81c2009-03-25 00:13:59 +00001008 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +00001009 }
Douglas Gregor6311d2b2011-09-09 18:32:39 +00001010 }
Douglas Gregorddc29e12009-02-06 22:42:48 +00001011 } else if (PrevDecl && PrevDecl->isTemplateParameter()) {
1012 // Maybe we will complain about the shadowed template parameter.
1013 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl);
1014 // Just pretend that we didn't see the previous declaration.
1015 PrevDecl = 0;
1016 } else if (PrevDecl) {
1017 // C++ [temp]p5:
1018 // A class template shall not have the same name as any other
1019 // template, class, function, object, enumeration, enumerator,
1020 // namespace, or type in the same scope (3.3), except as specified
1021 // in (14.5.4).
1022 Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
1023 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
Douglas Gregor212e81c2009-03-25 00:13:59 +00001024 return true;
Douglas Gregorddc29e12009-02-06 22:42:48 +00001025 }
1026
Douglas Gregord684b002009-02-10 19:49:53 +00001027 // Check the template parameter list of this declaration, possibly
1028 // merging in the template parameter list from the previous class
Richard Smith6e21b162012-04-22 02:13:50 +00001029 // template declaration. Skip this check for a friend in a dependent
1030 // context, because the template parameter list might be dependent.
1031 if (!(TUK == TUK_Friend && CurContext->isDependentContext()) &&
1032 CheckTemplateParameterList(TemplateParams,
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001033 PrevClassTemplate? PrevClassTemplate->getTemplateParameters() : 0,
Douglas Gregord89d86f2011-02-04 04:20:44 +00001034 (SS.isSet() && SemanticContext &&
Douglas Gregor461bf2e2011-02-04 12:22:53 +00001035 SemanticContext->isRecord() &&
1036 SemanticContext->isDependentContext())
Douglas Gregord89d86f2011-02-04 04:20:44 +00001037 ? TPC_ClassTemplateMember
1038 : TPC_ClassTemplate))
Douglas Gregord684b002009-02-10 19:49:53 +00001039 Invalid = true;
Mike Stump1eb44332009-09-09 15:08:12 +00001040
Douglas Gregor57265e32010-04-12 16:00:01 +00001041 if (SS.isSet()) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001042 // If the name of the template was qualified, we must be defining the
Douglas Gregor57265e32010-04-12 16:00:01 +00001043 // template out-of-line.
Richard Smith6e21b162012-04-22 02:13:50 +00001044 if (!SS.isInvalid() && !Invalid && !PrevClassTemplate) {
1045 Diag(NameLoc, TUK == TUK_Friend ? diag::err_friend_decl_does_not_match
1046 : diag::err_member_def_does_not_match)
Douglas Gregor57265e32010-04-12 16:00:01 +00001047 << Name << SemanticContext << SS.getRange();
Douglas Gregorea9f54a2011-11-01 21:35:16 +00001048 Invalid = true;
1049 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001050 }
1051
Mike Stump1eb44332009-09-09 15:08:12 +00001052 CXXRecordDecl *NewClass =
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00001053 CXXRecordDecl::Create(Context, Kind, SemanticContext, KWLoc, NameLoc, Name,
Mike Stump1eb44332009-09-09 15:08:12 +00001054 PrevClassTemplate?
Douglas Gregoraafc0cc2009-05-15 19:11:46 +00001055 PrevClassTemplate->getTemplatedDecl() : 0,
1056 /*DelayTypeCreation=*/true);
John McCallb6217662010-03-15 10:12:16 +00001057 SetNestedNameSpecifier(NewClass, SS);
Abramo Bagnarac57c17d2011-03-10 13:28:31 +00001058 if (NumOuterTemplateParamLists > 0)
1059 NewClass->setTemplateParameterListsInfo(Context,
1060 NumOuterTemplateParamLists,
1061 OuterTemplateParamLists);
Douglas Gregorddc29e12009-02-06 22:42:48 +00001062
Eli Friedman572ae0a2012-02-10 02:02:21 +00001063 // Add alignment attributes if necessary; these attributes are checked when
1064 // the ASTContext lays out the structure.
1065 AddAlignmentAttributesForRecord(NewClass);
1066 AddMsStructLayoutForRecord(NewClass);
1067
Douglas Gregorddc29e12009-02-06 22:42:48 +00001068 ClassTemplateDecl *NewTemplate
1069 = ClassTemplateDecl::Create(Context, SemanticContext, NameLoc,
1070 DeclarationName(Name), TemplateParams,
Douglas Gregor5953d8b2009-03-19 17:26:29 +00001071 NewClass, PrevClassTemplate);
Douglas Gregorbefc20e2009-03-26 00:10:35 +00001072 NewClass->setDescribedClassTemplate(NewTemplate);
Douglas Gregor6311d2b2011-09-09 18:32:39 +00001073
Douglas Gregor2ccd89c2011-12-20 18:11:52 +00001074 if (ModulePrivateLoc.isValid())
Douglas Gregor6311d2b2011-09-09 18:32:39 +00001075 NewTemplate->setModulePrivate();
Douglas Gregor8d267c52011-09-09 02:06:17 +00001076
Douglas Gregoraafc0cc2009-05-15 19:11:46 +00001077 // Build the type for the class template declaration now.
Douglas Gregor24bae922010-07-08 18:37:38 +00001078 QualType T = NewTemplate->getInjectedClassNameSpecialization();
John McCall3cb0ebd2010-03-10 03:28:59 +00001079 T = Context.getInjectedClassNameType(NewClass, T);
Douglas Gregoraafc0cc2009-05-15 19:11:46 +00001080 assert(T->isDependentType() && "Class template type is not dependent?");
1081 (void)T;
1082
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001083 // If we are providing an explicit specialization of a member that is a
Douglas Gregorfd056bc2009-10-13 16:30:37 +00001084 // class template, make a note of that.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001085 if (PrevClassTemplate &&
Douglas Gregorfd056bc2009-10-13 16:30:37 +00001086 PrevClassTemplate->getInstantiatedFromMemberTemplate())
1087 PrevClassTemplate->setMemberSpecialization();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001088
Anders Carlsson4cbe82c2009-03-26 01:24:28 +00001089 // Set the access specifier.
Douglas Gregor42acead2012-03-17 23:06:31 +00001090 if (!Invalid && TUK != TUK_Friend && NewTemplate->getDeclContext()->isRecord())
John McCall05b23ea2009-09-14 21:59:20 +00001091 SetMemberAccessSpecifier(NewTemplate, PrevClassTemplate, AS);
Mike Stump1eb44332009-09-09 15:08:12 +00001092
Douglas Gregorddc29e12009-02-06 22:42:48 +00001093 // Set the lexical context of these templates
1094 NewClass->setLexicalDeclContext(CurContext);
1095 NewTemplate->setLexicalDeclContext(CurContext);
1096
John McCall0f434ec2009-07-31 02:45:11 +00001097 if (TUK == TUK_Definition)
Douglas Gregorddc29e12009-02-06 22:42:48 +00001098 NewClass->startDefinition();
1099
1100 if (Attr)
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00001101 ProcessDeclAttributeList(S, NewClass, Attr);
Douglas Gregorddc29e12009-02-06 22:42:48 +00001102
John McCall05b23ea2009-09-14 21:59:20 +00001103 if (TUK != TUK_Friend)
1104 PushOnScopeChains(NewTemplate, S);
1105 else {
Douglas Gregord85bea22009-09-26 06:47:28 +00001106 if (PrevClassTemplate && PrevClassTemplate->getAccess() != AS_none) {
John McCall05b23ea2009-09-14 21:59:20 +00001107 NewTemplate->setAccess(PrevClassTemplate->getAccess());
Douglas Gregord85bea22009-09-26 06:47:28 +00001108 NewClass->setAccess(PrevClassTemplate->getAccess());
1109 }
John McCall05b23ea2009-09-14 21:59:20 +00001110
Douglas Gregord85bea22009-09-26 06:47:28 +00001111 NewTemplate->setObjectOfFriendDecl(/* PreviouslyDeclared = */
1112 PrevClassTemplate != NULL);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001113
John McCall05b23ea2009-09-14 21:59:20 +00001114 // Friend templates are visible in fairly strange ways.
1115 if (!CurContext->isDependentContext()) {
Sebastian Redl7a126a42010-08-31 00:36:30 +00001116 DeclContext *DC = SemanticContext->getRedeclContext();
Richard Smith1b7f9cb2012-03-13 03:12:56 +00001117 DC->makeDeclVisibleInContext(NewTemplate);
John McCall05b23ea2009-09-14 21:59:20 +00001118 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
1119 PushOnScopeChains(NewTemplate, EnclosingScope,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001120 /* AddToContext = */ false);
John McCall05b23ea2009-09-14 21:59:20 +00001121 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001122
Douglas Gregord85bea22009-09-26 06:47:28 +00001123 FriendDecl *Friend = FriendDecl::Create(Context, CurContext,
1124 NewClass->getLocation(),
1125 NewTemplate,
1126 /*FIXME:*/NewClass->getLocation());
1127 Friend->setAccess(AS_public);
1128 CurContext->addDecl(Friend);
John McCall05b23ea2009-09-14 21:59:20 +00001129 }
Douglas Gregorddc29e12009-02-06 22:42:48 +00001130
Douglas Gregord684b002009-02-10 19:49:53 +00001131 if (Invalid) {
1132 NewTemplate->setInvalidDecl();
1133 NewClass->setInvalidDecl();
1134 }
John McCalld226f652010-08-21 09:40:31 +00001135 return NewTemplate;
Douglas Gregorddc29e12009-02-06 22:42:48 +00001136}
1137
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001138/// \brief Diagnose the presence of a default template argument on a
1139/// template parameter, which is ill-formed in certain contexts.
1140///
1141/// \returns true if the default template argument should be dropped.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001142static bool DiagnoseDefaultTemplateArgument(Sema &S,
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001143 Sema::TemplateParamListContext TPC,
1144 SourceLocation ParamLoc,
1145 SourceRange DefArgRange) {
1146 switch (TPC) {
1147 case Sema::TPC_ClassTemplate:
Richard Smith3e4c6c42011-05-05 21:57:07 +00001148 case Sema::TPC_TypeAliasTemplate:
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001149 return false;
1150
1151 case Sema::TPC_FunctionTemplate:
Douglas Gregord89d86f2011-02-04 04:20:44 +00001152 case Sema::TPC_FriendFunctionTemplateDefinition:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001153 // C++ [temp.param]p9:
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001154 // A default template-argument shall not be specified in a
1155 // function template declaration or a function template
1156 // definition [...]
Douglas Gregord89d86f2011-02-04 04:20:44 +00001157 // If a friend function template declaration specifies a default
1158 // template-argument, that declaration shall be a definition and shall be
1159 // the only declaration of the function template in the translation unit.
1160 // (C++98/03 doesn't have this wording; see DR226).
David Blaikie4e4d0842012-03-11 07:00:24 +00001161 S.Diag(ParamLoc, S.getLangOpts().CPlusPlus0x ?
Richard Smithebaf0e62011-10-18 20:49:44 +00001162 diag::warn_cxx98_compat_template_parameter_default_in_function_template
1163 : diag::ext_template_parameter_default_in_function_template)
1164 << DefArgRange;
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001165 return false;
1166
1167 case Sema::TPC_ClassTemplateMember:
1168 // C++0x [temp.param]p9:
1169 // A default template-argument shall not be specified in the
1170 // template-parameter-lists of the definition of a member of a
1171 // class template that appears outside of the member's class.
1172 S.Diag(ParamLoc, diag::err_template_parameter_default_template_member)
1173 << DefArgRange;
1174 return true;
1175
1176 case Sema::TPC_FriendFunctionTemplate:
1177 // C++ [temp.param]p9:
1178 // A default template-argument shall not be specified in a
1179 // friend template declaration.
1180 S.Diag(ParamLoc, diag::err_template_parameter_default_friend_template)
1181 << DefArgRange;
1182 return true;
1183
1184 // FIXME: C++0x [temp.param]p9 allows default template-arguments
1185 // for friend function templates if there is only a single
1186 // declaration (and it is a definition). Strange!
1187 }
1188
David Blaikie7530c032012-01-17 06:56:22 +00001189 llvm_unreachable("Invalid TemplateParamListContext!");
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001190}
1191
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001192/// \brief Check for unexpanded parameter packs within the template parameters
1193/// of a template template parameter, recursively.
Benjamin Kramerda57f3e2011-03-26 12:38:21 +00001194static bool DiagnoseUnexpandedParameterPacks(Sema &S,
1195 TemplateTemplateParmDecl *TTP) {
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001196 TemplateParameterList *Params = TTP->getTemplateParameters();
1197 for (unsigned I = 0, N = Params->size(); I != N; ++I) {
1198 NamedDecl *P = Params->getParam(I);
1199 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001200 if (S.DiagnoseUnexpandedParameterPack(NTTP->getLocation(),
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001201 NTTP->getTypeSourceInfo(),
1202 Sema::UPPC_NonTypeTemplateParameterType))
1203 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001204
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001205 continue;
1206 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001207
1208 if (TemplateTemplateParmDecl *InnerTTP
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001209 = dyn_cast<TemplateTemplateParmDecl>(P))
1210 if (DiagnoseUnexpandedParameterPacks(S, InnerTTP))
1211 return true;
1212 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001213
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001214 return false;
1215}
1216
Douglas Gregord684b002009-02-10 19:49:53 +00001217/// \brief Checks the validity of a template parameter list, possibly
1218/// considering the template parameter list from a previous
1219/// declaration.
1220///
1221/// If an "old" template parameter list is provided, it must be
1222/// equivalent (per TemplateParameterListsAreEqual) to the "new"
1223/// template parameter list.
1224///
1225/// \param NewParams Template parameter list for a new template
1226/// declaration. This template parameter list will be updated with any
1227/// default arguments that are carried through from the previous
1228/// template parameter list.
1229///
1230/// \param OldParams If provided, template parameter list from a
1231/// previous declaration of the same template. Default template
1232/// arguments will be merged from the old template parameter list to
1233/// the new template parameter list.
1234///
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001235/// \param TPC Describes the context in which we are checking the given
1236/// template parameter list.
1237///
Douglas Gregord684b002009-02-10 19:49:53 +00001238/// \returns true if an error occurred, false otherwise.
1239bool Sema::CheckTemplateParameterList(TemplateParameterList *NewParams,
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001240 TemplateParameterList *OldParams,
1241 TemplateParamListContext TPC) {
Douglas Gregord684b002009-02-10 19:49:53 +00001242 bool Invalid = false;
Mike Stump1eb44332009-09-09 15:08:12 +00001243
Douglas Gregord684b002009-02-10 19:49:53 +00001244 // C++ [temp.param]p10:
1245 // The set of default template-arguments available for use with a
1246 // template declaration or definition is obtained by merging the
1247 // default arguments from the definition (if in scope) and all
1248 // declarations in scope in the same way default function
1249 // arguments are (8.3.6).
1250 bool SawDefaultArgument = false;
1251 SourceLocation PreviousDefaultArgLoc;
Douglas Gregorc15cb382009-02-09 23:23:08 +00001252
Mike Stump1a35fde2009-02-11 23:03:27 +00001253 // Dummy initialization to avoid warnings.
Douglas Gregor1bc69132009-02-11 20:46:19 +00001254 TemplateParameterList::iterator OldParam = NewParams->end();
Douglas Gregord684b002009-02-10 19:49:53 +00001255 if (OldParams)
1256 OldParam = OldParams->begin();
1257
Douglas Gregorfd1a8fd2011-01-27 01:40:17 +00001258 bool RemoveDefaultArguments = false;
Douglas Gregord684b002009-02-10 19:49:53 +00001259 for (TemplateParameterList::iterator NewParam = NewParams->begin(),
1260 NewParamEnd = NewParams->end();
1261 NewParam != NewParamEnd; ++NewParam) {
1262 // Variables used to diagnose redundant default arguments
1263 bool RedundantDefaultArg = false;
1264 SourceLocation OldDefaultLoc;
1265 SourceLocation NewDefaultLoc;
1266
David Blaikie1368e582011-10-19 05:19:50 +00001267 // Variable used to diagnose missing default arguments
Douglas Gregord684b002009-02-10 19:49:53 +00001268 bool MissingDefaultArg = false;
1269
David Blaikie1368e582011-10-19 05:19:50 +00001270 // Variable used to diagnose non-final parameter packs
1271 bool SawParameterPack = false;
Anders Carlsson49d25572009-06-12 23:20:15 +00001272
Douglas Gregord684b002009-02-10 19:49:53 +00001273 if (TemplateTypeParmDecl *NewTypeParm
1274 = dyn_cast<TemplateTypeParmDecl>(*NewParam)) {
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001275 // Check the presence of a default argument here.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001276 if (NewTypeParm->hasDefaultArgument() &&
1277 DiagnoseDefaultTemplateArgument(*this, TPC,
1278 NewTypeParm->getLocation(),
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001279 NewTypeParm->getDefaultArgumentInfo()->getTypeLoc()
Abramo Bagnarabd054db2010-05-20 10:00:11 +00001280 .getSourceRange()))
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001281 NewTypeParm->removeDefaultArgument();
1282
1283 // Merge default arguments for template type parameters.
Mike Stump1eb44332009-09-09 15:08:12 +00001284 TemplateTypeParmDecl *OldTypeParm
Douglas Gregord684b002009-02-10 19:49:53 +00001285 = OldParams? cast<TemplateTypeParmDecl>(*OldParam) : 0;
Mike Stump1eb44332009-09-09 15:08:12 +00001286
Anders Carlsson49d25572009-06-12 23:20:15 +00001287 if (NewTypeParm->isParameterPack()) {
1288 assert(!NewTypeParm->hasDefaultArgument() &&
1289 "Parameter packs can't have a default argument!");
1290 SawParameterPack = true;
Mike Stump1eb44332009-09-09 15:08:12 +00001291 } else if (OldTypeParm && OldTypeParm->hasDefaultArgument() &&
John McCall833ca992009-10-29 08:12:44 +00001292 NewTypeParm->hasDefaultArgument()) {
Douglas Gregord684b002009-02-10 19:49:53 +00001293 OldDefaultLoc = OldTypeParm->getDefaultArgumentLoc();
1294 NewDefaultLoc = NewTypeParm->getDefaultArgumentLoc();
1295 SawDefaultArgument = true;
1296 RedundantDefaultArg = true;
1297 PreviousDefaultArgLoc = NewDefaultLoc;
1298 } else if (OldTypeParm && OldTypeParm->hasDefaultArgument()) {
1299 // Merge the default argument from the old declaration to the
1300 // new declaration.
1301 SawDefaultArgument = true;
John McCall833ca992009-10-29 08:12:44 +00001302 NewTypeParm->setDefaultArgument(OldTypeParm->getDefaultArgumentInfo(),
Douglas Gregord684b002009-02-10 19:49:53 +00001303 true);
1304 PreviousDefaultArgLoc = OldTypeParm->getDefaultArgumentLoc();
1305 } else if (NewTypeParm->hasDefaultArgument()) {
1306 SawDefaultArgument = true;
1307 PreviousDefaultArgLoc = NewTypeParm->getDefaultArgumentLoc();
1308 } else if (SawDefaultArgument)
1309 MissingDefaultArg = true;
Mike Stumpac5fc7c2009-08-04 21:02:39 +00001310 } else if (NonTypeTemplateParmDecl *NewNonTypeParm
Douglas Gregord684b002009-02-10 19:49:53 +00001311 = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) {
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001312 // Check for unexpanded parameter packs.
1313 if (DiagnoseUnexpandedParameterPack(NewNonTypeParm->getLocation(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001314 NewNonTypeParm->getTypeSourceInfo(),
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001315 UPPC_NonTypeTemplateParameterType)) {
1316 Invalid = true;
1317 continue;
1318 }
1319
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001320 // Check the presence of a default argument here.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001321 if (NewNonTypeParm->hasDefaultArgument() &&
1322 DiagnoseDefaultTemplateArgument(*this, TPC,
1323 NewNonTypeParm->getLocation(),
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001324 NewNonTypeParm->getDefaultArgument()->getSourceRange())) {
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00001325 NewNonTypeParm->removeDefaultArgument();
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001326 }
1327
Mike Stumpac5fc7c2009-08-04 21:02:39 +00001328 // Merge default arguments for non-type template parameters
Douglas Gregord684b002009-02-10 19:49:53 +00001329 NonTypeTemplateParmDecl *OldNonTypeParm
1330 = OldParams? cast<NonTypeTemplateParmDecl>(*OldParam) : 0;
Douglas Gregor1ed64762011-01-05 16:19:19 +00001331 if (NewNonTypeParm->isParameterPack()) {
1332 assert(!NewNonTypeParm->hasDefaultArgument() &&
1333 "Parameter packs can't have a default argument!");
1334 SawParameterPack = true;
Douglas Gregor1ed64762011-01-05 16:19:19 +00001335 } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument() &&
Douglas Gregord684b002009-02-10 19:49:53 +00001336 NewNonTypeParm->hasDefaultArgument()) {
1337 OldDefaultLoc = OldNonTypeParm->getDefaultArgumentLoc();
1338 NewDefaultLoc = NewNonTypeParm->getDefaultArgumentLoc();
1339 SawDefaultArgument = true;
1340 RedundantDefaultArg = true;
1341 PreviousDefaultArgLoc = NewDefaultLoc;
1342 } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument()) {
1343 // Merge the default argument from the old declaration to the
1344 // new declaration.
1345 SawDefaultArgument = true;
1346 // FIXME: We need to create a new kind of "default argument"
Douglas Gregor61c4d282011-01-05 15:48:55 +00001347 // expression that points to a previous non-type template
Douglas Gregord684b002009-02-10 19:49:53 +00001348 // parameter.
1349 NewNonTypeParm->setDefaultArgument(
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00001350 OldNonTypeParm->getDefaultArgument(),
1351 /*Inherited=*/ true);
Douglas Gregord684b002009-02-10 19:49:53 +00001352 PreviousDefaultArgLoc = OldNonTypeParm->getDefaultArgumentLoc();
1353 } else if (NewNonTypeParm->hasDefaultArgument()) {
1354 SawDefaultArgument = true;
1355 PreviousDefaultArgLoc = NewNonTypeParm->getDefaultArgumentLoc();
1356 } else if (SawDefaultArgument)
Mike Stump1eb44332009-09-09 15:08:12 +00001357 MissingDefaultArg = true;
Mike Stumpac5fc7c2009-08-04 21:02:39 +00001358 } else {
Douglas Gregord684b002009-02-10 19:49:53 +00001359 TemplateTemplateParmDecl *NewTemplateParm
1360 = cast<TemplateTemplateParmDecl>(*NewParam);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001361
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001362 // Check for unexpanded parameter packs, recursively.
Douglas Gregor65019ac2011-10-25 03:44:56 +00001363 if (::DiagnoseUnexpandedParameterPacks(*this, NewTemplateParm)) {
Douglas Gregor4d2abba2010-12-16 15:36:43 +00001364 Invalid = true;
1365 continue;
1366 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001367
David Blaikie1368e582011-10-19 05:19:50 +00001368 // Check the presence of a default argument here.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001369 if (NewTemplateParm->hasDefaultArgument() &&
1370 DiagnoseDefaultTemplateArgument(*this, TPC,
1371 NewTemplateParm->getLocation(),
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001372 NewTemplateParm->getDefaultArgument().getSourceRange()))
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00001373 NewTemplateParm->removeDefaultArgument();
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001374
1375 // Merge default arguments for template template parameters
Douglas Gregord684b002009-02-10 19:49:53 +00001376 TemplateTemplateParmDecl *OldTemplateParm
1377 = OldParams? cast<TemplateTemplateParmDecl>(*OldParam) : 0;
Douglas Gregor1ed64762011-01-05 16:19:19 +00001378 if (NewTemplateParm->isParameterPack()) {
1379 assert(!NewTemplateParm->hasDefaultArgument() &&
1380 "Parameter packs can't have a default argument!");
1381 SawParameterPack = true;
Douglas Gregor1ed64762011-01-05 16:19:19 +00001382 } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument() &&
Douglas Gregord684b002009-02-10 19:49:53 +00001383 NewTemplateParm->hasDefaultArgument()) {
Douglas Gregor788cd062009-11-11 01:00:40 +00001384 OldDefaultLoc = OldTemplateParm->getDefaultArgument().getLocation();
1385 NewDefaultLoc = NewTemplateParm->getDefaultArgument().getLocation();
Douglas Gregord684b002009-02-10 19:49:53 +00001386 SawDefaultArgument = true;
1387 RedundantDefaultArg = true;
1388 PreviousDefaultArgLoc = NewDefaultLoc;
1389 } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument()) {
1390 // Merge the default argument from the old declaration to the
1391 // new declaration.
1392 SawDefaultArgument = true;
Mike Stump390b4cc2009-05-16 07:39:55 +00001393 // FIXME: We need to create a new kind of "default argument" expression
1394 // that points to a previous template template parameter.
Douglas Gregord684b002009-02-10 19:49:53 +00001395 NewTemplateParm->setDefaultArgument(
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00001396 OldTemplateParm->getDefaultArgument(),
1397 /*Inherited=*/ true);
Douglas Gregor788cd062009-11-11 01:00:40 +00001398 PreviousDefaultArgLoc
1399 = OldTemplateParm->getDefaultArgument().getLocation();
Douglas Gregord684b002009-02-10 19:49:53 +00001400 } else if (NewTemplateParm->hasDefaultArgument()) {
1401 SawDefaultArgument = true;
Douglas Gregor788cd062009-11-11 01:00:40 +00001402 PreviousDefaultArgLoc
1403 = NewTemplateParm->getDefaultArgument().getLocation();
Douglas Gregord684b002009-02-10 19:49:53 +00001404 } else if (SawDefaultArgument)
Mike Stump1eb44332009-09-09 15:08:12 +00001405 MissingDefaultArg = true;
Douglas Gregord684b002009-02-10 19:49:53 +00001406 }
1407
David Blaikie1368e582011-10-19 05:19:50 +00001408 // C++0x [temp.param]p11:
1409 // If a template parameter of a primary class template or alias template
1410 // is a template parameter pack, it shall be the last template parameter.
1411 if (SawParameterPack && (NewParam + 1) != NewParamEnd &&
1412 (TPC == TPC_ClassTemplate || TPC == TPC_TypeAliasTemplate)) {
1413 Diag((*NewParam)->getLocation(),
1414 diag::err_template_param_pack_must_be_last_template_parameter);
1415 Invalid = true;
1416 }
1417
Douglas Gregord684b002009-02-10 19:49:53 +00001418 if (RedundantDefaultArg) {
1419 // C++ [temp.param]p12:
1420 // A template-parameter shall not be given default arguments
1421 // by two different declarations in the same scope.
1422 Diag(NewDefaultLoc, diag::err_template_param_default_arg_redefinition);
1423 Diag(OldDefaultLoc, diag::note_template_param_prev_default_arg);
1424 Invalid = true;
Douglas Gregoree5d21f2011-02-04 03:57:22 +00001425 } else if (MissingDefaultArg && TPC != TPC_FunctionTemplate) {
Douglas Gregord684b002009-02-10 19:49:53 +00001426 // C++ [temp.param]p11:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001427 // If a template-parameter of a class template has a default
1428 // template-argument, each subsequent template-parameter shall either
Douglas Gregorb49e4152011-01-05 16:21:17 +00001429 // have a default template-argument supplied or be a template parameter
1430 // pack.
Mike Stump1eb44332009-09-09 15:08:12 +00001431 Diag((*NewParam)->getLocation(),
Douglas Gregord684b002009-02-10 19:49:53 +00001432 diag::err_template_param_default_arg_missing);
1433 Diag(PreviousDefaultArgLoc, diag::note_template_param_prev_default_arg);
1434 Invalid = true;
Douglas Gregorfd1a8fd2011-01-27 01:40:17 +00001435 RemoveDefaultArguments = true;
Douglas Gregord684b002009-02-10 19:49:53 +00001436 }
1437
1438 // If we have an old template parameter list that we're merging
1439 // in, move on to the next parameter.
1440 if (OldParams)
1441 ++OldParam;
1442 }
1443
Douglas Gregorfd1a8fd2011-01-27 01:40:17 +00001444 // We were missing some default arguments at the end of the list, so remove
1445 // all of the default arguments.
1446 if (RemoveDefaultArguments) {
1447 for (TemplateParameterList::iterator NewParam = NewParams->begin(),
1448 NewParamEnd = NewParams->end();
1449 NewParam != NewParamEnd; ++NewParam) {
1450 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*NewParam))
1451 TTP->removeDefaultArgument();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001452 else if (NonTypeTemplateParmDecl *NTTP
Douglas Gregorfd1a8fd2011-01-27 01:40:17 +00001453 = dyn_cast<NonTypeTemplateParmDecl>(*NewParam))
1454 NTTP->removeDefaultArgument();
1455 else
1456 cast<TemplateTemplateParmDecl>(*NewParam)->removeDefaultArgument();
1457 }
1458 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00001459
Douglas Gregord684b002009-02-10 19:49:53 +00001460 return Invalid;
1461}
Douglas Gregorc15cb382009-02-09 23:23:08 +00001462
John McCall4e2cbb22010-10-20 05:44:58 +00001463namespace {
1464
1465/// A class which looks for a use of a certain level of template
1466/// parameter.
1467struct DependencyChecker : RecursiveASTVisitor<DependencyChecker> {
1468 typedef RecursiveASTVisitor<DependencyChecker> super;
1469
1470 unsigned Depth;
1471 bool Match;
1472
1473 DependencyChecker(TemplateParameterList *Params) : Match(false) {
1474 NamedDecl *ND = Params->getParam(0);
1475 if (TemplateTypeParmDecl *PD = dyn_cast<TemplateTypeParmDecl>(ND)) {
1476 Depth = PD->getDepth();
1477 } else if (NonTypeTemplateParmDecl *PD =
1478 dyn_cast<NonTypeTemplateParmDecl>(ND)) {
1479 Depth = PD->getDepth();
1480 } else {
1481 Depth = cast<TemplateTemplateParmDecl>(ND)->getDepth();
1482 }
1483 }
1484
1485 bool Matches(unsigned ParmDepth) {
1486 if (ParmDepth >= Depth) {
1487 Match = true;
1488 return true;
1489 }
1490 return false;
1491 }
1492
1493 bool VisitTemplateTypeParmType(const TemplateTypeParmType *T) {
1494 return !Matches(T->getDepth());
1495 }
1496
1497 bool TraverseTemplateName(TemplateName N) {
1498 if (TemplateTemplateParmDecl *PD =
1499 dyn_cast_or_null<TemplateTemplateParmDecl>(N.getAsTemplateDecl()))
1500 if (Matches(PD->getDepth())) return false;
1501 return super::TraverseTemplateName(N);
1502 }
1503
1504 bool VisitDeclRefExpr(DeclRefExpr *E) {
1505 if (NonTypeTemplateParmDecl *PD =
1506 dyn_cast<NonTypeTemplateParmDecl>(E->getDecl())) {
1507 if (PD->getDepth() == Depth) {
1508 Match = true;
1509 return false;
1510 }
1511 }
1512 return super::VisitDeclRefExpr(E);
1513 }
Douglas Gregor18c83392011-05-13 00:34:01 +00001514
1515 bool TraverseInjectedClassNameType(const InjectedClassNameType *T) {
1516 return TraverseType(T->getInjectedSpecializationType());
1517 }
John McCall4e2cbb22010-10-20 05:44:58 +00001518};
1519}
1520
Douglas Gregorc8406492011-05-10 18:27:06 +00001521/// Determines whether a given type depends on the given parameter
John McCall4e2cbb22010-10-20 05:44:58 +00001522/// list.
1523static bool
Douglas Gregorc8406492011-05-10 18:27:06 +00001524DependsOnTemplateParameters(QualType T, TemplateParameterList *Params) {
John McCall4e2cbb22010-10-20 05:44:58 +00001525 DependencyChecker Checker(Params);
Douglas Gregorc8406492011-05-10 18:27:06 +00001526 Checker.TraverseType(T);
John McCall4e2cbb22010-10-20 05:44:58 +00001527 return Checker.Match;
1528}
1529
Douglas Gregorc8406492011-05-10 18:27:06 +00001530// Find the source range corresponding to the named type in the given
1531// nested-name-specifier, if any.
1532static SourceRange getRangeOfTypeInNestedNameSpecifier(ASTContext &Context,
1533 QualType T,
1534 const CXXScopeSpec &SS) {
1535 NestedNameSpecifierLoc NNSLoc(SS.getScopeRep(), SS.location_data());
1536 while (NestedNameSpecifier *NNS = NNSLoc.getNestedNameSpecifier()) {
1537 if (const Type *CurType = NNS->getAsType()) {
1538 if (Context.hasSameUnqualifiedType(T, QualType(CurType, 0)))
1539 return NNSLoc.getTypeLoc().getSourceRange();
1540 } else
1541 break;
1542
1543 NNSLoc = NNSLoc.getPrefix();
1544 }
1545
1546 return SourceRange();
1547}
1548
Mike Stump1eb44332009-09-09 15:08:12 +00001549/// \brief Match the given template parameter lists to the given scope
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001550/// specifier, returning the template parameter list that applies to the
1551/// name.
1552///
1553/// \param DeclStartLoc the start of the declaration that has a scope
1554/// specifier or a template parameter list.
Mike Stump1eb44332009-09-09 15:08:12 +00001555///
Douglas Gregorc8406492011-05-10 18:27:06 +00001556/// \param DeclLoc The location of the declaration itself.
1557///
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001558/// \param SS the scope specifier that will be matched to the given template
1559/// parameter lists. This scope specifier precedes a qualified name that is
1560/// being declared.
1561///
1562/// \param ParamLists the template parameter lists, from the outermost to the
1563/// innermost template parameter lists.
1564///
1565/// \param NumParamLists the number of template parameter lists in ParamLists.
1566///
John McCall77e8b112010-04-13 20:37:33 +00001567/// \param IsFriend Whether to apply the slightly different rules for
1568/// matching template parameters to scope specifiers in friend
1569/// declarations.
1570///
Douglas Gregor1fef4e62009-10-07 22:35:40 +00001571/// \param IsExplicitSpecialization will be set true if the entity being
1572/// declared is an explicit specialization, false otherwise.
1573///
Mike Stump1eb44332009-09-09 15:08:12 +00001574/// \returns the template parameter list, if any, that corresponds to the
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001575/// name that is preceded by the scope specifier @p SS. This template
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00001576/// parameter list may have template parameters (if we're declaring a
Mike Stump1eb44332009-09-09 15:08:12 +00001577/// template) or may have no template parameters (if we're declaring a
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00001578/// template specialization), or may be NULL (if what we're declaring isn't
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001579/// itself a template).
1580TemplateParameterList *
1581Sema::MatchTemplateParametersToScopeSpecifier(SourceLocation DeclStartLoc,
Douglas Gregorc8406492011-05-10 18:27:06 +00001582 SourceLocation DeclLoc,
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001583 const CXXScopeSpec &SS,
1584 TemplateParameterList **ParamLists,
Douglas Gregor1fef4e62009-10-07 22:35:40 +00001585 unsigned NumParamLists,
John McCall77e8b112010-04-13 20:37:33 +00001586 bool IsFriend,
Douglas Gregor0167f3c2010-07-14 23:14:12 +00001587 bool &IsExplicitSpecialization,
1588 bool &Invalid) {
Douglas Gregor1fef4e62009-10-07 22:35:40 +00001589 IsExplicitSpecialization = false;
Douglas Gregorc8406492011-05-10 18:27:06 +00001590 Invalid = false;
1591
1592 // The sequence of nested types to which we will match up the template
1593 // parameter lists. We first build this list by starting with the type named
1594 // by the nested-name-specifier and walking out until we run out of types.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001595 SmallVector<QualType, 4> NestedTypes;
Douglas Gregorc8406492011-05-10 18:27:06 +00001596 QualType T;
Douglas Gregor714c9922011-05-15 17:27:27 +00001597 if (SS.getScopeRep()) {
1598 if (CXXRecordDecl *Record
1599 = dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS, true)))
1600 T = Context.getTypeDeclType(Record);
1601 else
1602 T = QualType(SS.getScopeRep()->getAsType(), 0);
1603 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001604
1605 // If we found an explicit specialization that prevents us from needing
1606 // 'template<>' headers, this will be set to the location of that
1607 // explicit specialization.
1608 SourceLocation ExplicitSpecLoc;
1609
1610 while (!T.isNull()) {
1611 NestedTypes.push_back(T);
1612
1613 // Retrieve the parent of a record type.
1614 if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) {
1615 // If this type is an explicit specialization, we're done.
1616 if (ClassTemplateSpecializationDecl *Spec
1617 = dyn_cast<ClassTemplateSpecializationDecl>(Record)) {
1618 if (!isa<ClassTemplatePartialSpecializationDecl>(Spec) &&
1619 Spec->getSpecializationKind() == TSK_ExplicitSpecialization) {
1620 ExplicitSpecLoc = Spec->getLocation();
1621 break;
Douglas Gregor3ebd7532009-11-23 12:11:45 +00001622 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001623 } else if (Record->getTemplateSpecializationKind()
1624 == TSK_ExplicitSpecialization) {
1625 ExplicitSpecLoc = Record->getLocation();
John McCall77e8b112010-04-13 20:37:33 +00001626 break;
1627 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001628
1629 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Record->getParent()))
1630 T = Context.getTypeDeclType(Parent);
1631 else
1632 T = QualType();
1633 continue;
1634 }
1635
1636 if (const TemplateSpecializationType *TST
1637 = T->getAs<TemplateSpecializationType>()) {
1638 if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) {
1639 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Template->getDeclContext()))
1640 T = Context.getTypeDeclType(Parent);
1641 else
1642 T = QualType();
1643 continue;
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001644 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001645 }
1646
1647 // Look one step prior in a dependent template specialization type.
1648 if (const DependentTemplateSpecializationType *DependentTST
1649 = T->getAs<DependentTemplateSpecializationType>()) {
1650 if (NestedNameSpecifier *NNS = DependentTST->getQualifier())
1651 T = QualType(NNS->getAsType(), 0);
1652 else
1653 T = QualType();
1654 continue;
1655 }
1656
1657 // Look one step prior in a dependent name type.
1658 if (const DependentNameType *DependentName = T->getAs<DependentNameType>()){
1659 if (NestedNameSpecifier *NNS = DependentName->getQualifier())
1660 T = QualType(NNS->getAsType(), 0);
1661 else
1662 T = QualType();
1663 continue;
1664 }
1665
1666 // Retrieve the parent of an enumeration type.
1667 if (const EnumType *EnumT = T->getAs<EnumType>()) {
1668 // FIXME: Forward-declared enums require a TSK_ExplicitSpecialization
1669 // check here.
1670 EnumDecl *Enum = EnumT->getDecl();
1671
1672 // Get to the parent type.
1673 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Enum->getParent()))
1674 T = Context.getTypeDeclType(Parent);
1675 else
1676 T = QualType();
1677 continue;
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001678 }
Mike Stump1eb44332009-09-09 15:08:12 +00001679
Douglas Gregorc8406492011-05-10 18:27:06 +00001680 T = QualType();
1681 }
1682 // Reverse the nested types list, since we want to traverse from the outermost
1683 // to the innermost while checking template-parameter-lists.
1684 std::reverse(NestedTypes.begin(), NestedTypes.end());
Douglas Gregorb88e8882009-07-30 17:40:51 +00001685
Douglas Gregorc8406492011-05-10 18:27:06 +00001686 // C++0x [temp.expl.spec]p17:
1687 // A member or a member template may be nested within many
1688 // enclosing class templates. In an explicit specialization for
1689 // such a member, the member declaration shall be preceded by a
1690 // template<> for each enclosing class template that is
1691 // explicitly specialized.
Douglas Gregor89b9f102011-06-06 15:22:55 +00001692 bool SawNonEmptyTemplateParameterList = false;
Douglas Gregorc8406492011-05-10 18:27:06 +00001693 unsigned ParamIdx = 0;
1694 for (unsigned TypeIdx = 0, NumTypes = NestedTypes.size(); TypeIdx != NumTypes;
1695 ++TypeIdx) {
1696 T = NestedTypes[TypeIdx];
1697
1698 // Whether we expect a 'template<>' header.
1699 bool NeedEmptyTemplateHeader = false;
1700
1701 // Whether we expect a template header with parameters.
1702 bool NeedNonemptyTemplateHeader = false;
1703
1704 // For a dependent type, the set of template parameters that we
1705 // expect to see.
1706 TemplateParameterList *ExpectedTemplateParams = 0;
1707
Douglas Gregor175c5bb2011-05-11 23:26:17 +00001708 // C++0x [temp.expl.spec]p15:
1709 // A member or a member template may be nested within many enclosing
1710 // class templates. In an explicit specialization for such a member, the
1711 // member declaration shall be preceded by a template<> for each
1712 // enclosing class template that is explicitly specialized.
Douglas Gregorc8406492011-05-10 18:27:06 +00001713 if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) {
1714 if (ClassTemplatePartialSpecializationDecl *Partial
1715 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) {
1716 ExpectedTemplateParams = Partial->getTemplateParameters();
1717 NeedNonemptyTemplateHeader = true;
1718 } else if (Record->isDependentType()) {
1719 if (Record->getDescribedClassTemplate()) {
John McCall31f17ec2010-04-27 00:57:59 +00001720 ExpectedTemplateParams = Record->getDescribedClassTemplate()
Douglas Gregorc8406492011-05-10 18:27:06 +00001721 ->getTemplateParameters();
1722 NeedNonemptyTemplateHeader = true;
1723 }
1724 } else if (ClassTemplateSpecializationDecl *Spec
1725 = dyn_cast<ClassTemplateSpecializationDecl>(Record)) {
1726 // C++0x [temp.expl.spec]p4:
1727 // Members of an explicitly specialized class template are defined
1728 // in the same manner as members of normal classes, and not using
1729 // the template<> syntax.
1730 if (Spec->getSpecializationKind() != TSK_ExplicitSpecialization)
1731 NeedEmptyTemplateHeader = true;
1732 else
Douglas Gregor95ea4502011-06-01 22:37:07 +00001733 continue;
Douglas Gregorc8406492011-05-10 18:27:06 +00001734 } else if (Record->getTemplateSpecializationKind()) {
1735 if (Record->getTemplateSpecializationKind()
Douglas Gregor175c5bb2011-05-11 23:26:17 +00001736 != TSK_ExplicitSpecialization &&
1737 TypeIdx == NumTypes - 1)
1738 IsExplicitSpecialization = true;
1739
1740 continue;
Douglas Gregorc8406492011-05-10 18:27:06 +00001741 }
1742 } else if (const TemplateSpecializationType *TST
1743 = T->getAs<TemplateSpecializationType>()) {
1744 if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) {
1745 ExpectedTemplateParams = Template->getTemplateParameters();
1746 NeedNonemptyTemplateHeader = true;
1747 }
1748 } else if (T->getAs<DependentTemplateSpecializationType>()) {
1749 // FIXME: We actually could/should check the template arguments here
1750 // against the corresponding template parameter list.
1751 NeedNonemptyTemplateHeader = false;
1752 }
1753
Douglas Gregor89b9f102011-06-06 15:22:55 +00001754 // C++ [temp.expl.spec]p16:
1755 // In an explicit specialization declaration for a member of a class
1756 // template or a member template that ap- pears in namespace scope, the
1757 // member template and some of its enclosing class templates may remain
1758 // unspecialized, except that the declaration shall not explicitly
1759 // specialize a class member template if its en- closing class templates
1760 // are not explicitly specialized as well.
1761 if (ParamIdx < NumParamLists) {
1762 if (ParamLists[ParamIdx]->size() == 0) {
1763 if (SawNonEmptyTemplateParameterList) {
1764 Diag(DeclLoc, diag::err_specialize_member_of_template)
1765 << ParamLists[ParamIdx]->getSourceRange();
1766 Invalid = true;
1767 IsExplicitSpecialization = false;
1768 return 0;
1769 }
1770 } else
1771 SawNonEmptyTemplateParameterList = true;
1772 }
1773
Douglas Gregorc8406492011-05-10 18:27:06 +00001774 if (NeedEmptyTemplateHeader) {
1775 // If we're on the last of the types, and we need a 'template<>' header
1776 // here, then it's an explicit specialization.
1777 if (TypeIdx == NumTypes - 1)
1778 IsExplicitSpecialization = true;
1779
1780 if (ParamIdx < NumParamLists) {
1781 if (ParamLists[ParamIdx]->size() > 0) {
1782 // The header has template parameters when it shouldn't. Complain.
1783 Diag(ParamLists[ParamIdx]->getTemplateLoc(),
1784 diag::err_template_param_list_matches_nontemplate)
1785 << T
1786 << SourceRange(ParamLists[ParamIdx]->getLAngleLoc(),
1787 ParamLists[ParamIdx]->getRAngleLoc())
1788 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS);
1789 Invalid = true;
1790 return 0;
1791 }
1792
1793 // Consume this template header.
1794 ++ParamIdx;
1795 continue;
1796 }
1797
1798 if (!IsFriend) {
1799 // We don't have a template header, but we should.
1800 SourceLocation ExpectedTemplateLoc;
1801 if (NumParamLists > 0)
1802 ExpectedTemplateLoc = ParamLists[0]->getTemplateLoc();
1803 else
1804 ExpectedTemplateLoc = DeclStartLoc;
1805
1806 Diag(DeclLoc, diag::err_template_spec_needs_header)
1807 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS)
1808 << FixItHint::CreateInsertion(ExpectedTemplateLoc, "template<> ");
1809 }
1810
1811 continue;
1812 }
1813
1814 if (NeedNonemptyTemplateHeader) {
1815 // In friend declarations we can have template-ids which don't
1816 // depend on the corresponding template parameter lists. But
1817 // assume that empty parameter lists are supposed to match this
1818 // template-id.
1819 if (IsFriend && T->isDependentType()) {
1820 if (ParamIdx < NumParamLists &&
1821 DependsOnTemplateParameters(T, ParamLists[ParamIdx]))
1822 ExpectedTemplateParams = 0;
1823 else
1824 continue;
Mike Stump1eb44332009-09-09 15:08:12 +00001825 }
Douglas Gregor5b6d70e2009-11-25 17:50:39 +00001826
Douglas Gregorc8406492011-05-10 18:27:06 +00001827 if (ParamIdx < NumParamLists) {
1828 // Check the template parameter list, if we can.
1829 if (ExpectedTemplateParams &&
1830 !TemplateParameterListsAreEqual(ParamLists[ParamIdx],
1831 ExpectedTemplateParams,
1832 true, TPL_TemplateMatch))
1833 Invalid = true;
1834
1835 if (!Invalid &&
1836 CheckTemplateParameterList(ParamLists[ParamIdx], 0,
1837 TPC_ClassTemplateMember))
1838 Invalid = true;
1839
1840 ++ParamIdx;
1841 continue;
1842 }
1843
1844 Diag(DeclLoc, diag::err_template_spec_needs_template_parameters)
1845 << T
1846 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS);
1847 Invalid = true;
1848 continue;
1849 }
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001850 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001851
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001852 // If there were at least as many template-ids as there were template
1853 // parameter lists, then there are no template parameter lists remaining for
1854 // the declaration itself.
John McCall4e2cbb22010-10-20 05:44:58 +00001855 if (ParamIdx >= NumParamLists)
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001856 return 0;
Mike Stump1eb44332009-09-09 15:08:12 +00001857
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001858 // If there were too many template parameter lists, complain about that now.
Douglas Gregorc8406492011-05-10 18:27:06 +00001859 if (ParamIdx < NumParamLists - 1) {
1860 bool HasAnyExplicitSpecHeader = false;
1861 bool AllExplicitSpecHeaders = true;
1862 for (unsigned I = ParamIdx; I != NumParamLists - 1; ++I) {
1863 if (ParamLists[I]->size() == 0)
1864 HasAnyExplicitSpecHeader = true;
1865 else
1866 AllExplicitSpecHeaders = false;
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001867 }
Douglas Gregorc8406492011-05-10 18:27:06 +00001868
1869 Diag(ParamLists[ParamIdx]->getTemplateLoc(),
1870 AllExplicitSpecHeaders? diag::warn_template_spec_extra_headers
1871 : diag::err_template_spec_extra_headers)
1872 << SourceRange(ParamLists[ParamIdx]->getTemplateLoc(),
1873 ParamLists[NumParamLists - 2]->getRAngleLoc());
1874
1875 // If there was a specialization somewhere, such that 'template<>' is
1876 // not required, and there were any 'template<>' headers, note where the
1877 // specialization occurred.
1878 if (ExplicitSpecLoc.isValid() && HasAnyExplicitSpecHeader)
1879 Diag(ExplicitSpecLoc,
1880 diag::note_explicit_template_spec_does_not_need_header)
1881 << NestedTypes.back();
1882
1883 // We have a template parameter list with no corresponding scope, which
1884 // means that the resulting template declaration can't be instantiated
1885 // properly (we'll end up with dependent nodes when we shouldn't).
1886 if (!AllExplicitSpecHeaders)
1887 Invalid = true;
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001888 }
Mike Stump1eb44332009-09-09 15:08:12 +00001889
Douglas Gregor89b9f102011-06-06 15:22:55 +00001890 // C++ [temp.expl.spec]p16:
1891 // In an explicit specialization declaration for a member of a class
1892 // template or a member template that ap- pears in namespace scope, the
1893 // member template and some of its enclosing class templates may remain
1894 // unspecialized, except that the declaration shall not explicitly
1895 // specialize a class member template if its en- closing class templates
1896 // are not explicitly specialized as well.
1897 if (ParamLists[NumParamLists - 1]->size() == 0 &&
1898 SawNonEmptyTemplateParameterList) {
1899 Diag(DeclLoc, diag::err_specialize_member_of_template)
1900 << ParamLists[ParamIdx]->getSourceRange();
1901 Invalid = true;
1902 IsExplicitSpecialization = false;
1903 return 0;
1904 }
1905
Douglas Gregorf59a56e2009-07-21 23:53:31 +00001906 // Return the last template parameter list, which corresponds to the
1907 // entity being declared.
1908 return ParamLists[NumParamLists - 1];
1909}
1910
Douglas Gregor6cd9d4a2011-03-04 21:37:14 +00001911void Sema::NoteAllFoundTemplates(TemplateName Name) {
1912 if (TemplateDecl *Template = Name.getAsTemplateDecl()) {
1913 Diag(Template->getLocation(), diag::note_template_declared_here)
1914 << (isa<FunctionTemplateDecl>(Template)? 0
1915 : isa<ClassTemplateDecl>(Template)? 1
Richard Smith3e4c6c42011-05-05 21:57:07 +00001916 : isa<TypeAliasTemplateDecl>(Template)? 2
1917 : 3)
Douglas Gregor6cd9d4a2011-03-04 21:37:14 +00001918 << Template->getDeclName();
1919 return;
1920 }
1921
1922 if (OverloadedTemplateStorage *OST = Name.getAsOverloadedTemplate()) {
1923 for (OverloadedTemplateStorage::iterator I = OST->begin(),
1924 IEnd = OST->end();
1925 I != IEnd; ++I)
1926 Diag((*I)->getLocation(), diag::note_template_declared_here)
1927 << 0 << (*I)->getDeclName();
1928
1929 return;
1930 }
1931}
1932
Douglas Gregor7532dc62009-03-30 22:58:21 +00001933QualType Sema::CheckTemplateIdType(TemplateName Name,
1934 SourceLocation TemplateLoc,
Douglas Gregor67714232011-03-03 02:41:12 +00001935 TemplateArgumentListInfo &TemplateArgs) {
John McCall14606042011-06-30 08:33:18 +00001936 DependentTemplateName *DTN
1937 = Name.getUnderlying().getAsDependentTemplateName();
Richard Smith3e4c6c42011-05-05 21:57:07 +00001938 if (DTN && DTN->isIdentifier())
1939 // When building a template-id where the template-name is dependent,
1940 // assume the template is a type template. Either our assumption is
1941 // correct, or the code is ill-formed and will be diagnosed when the
1942 // dependent name is substituted.
1943 return Context.getDependentTemplateSpecializationType(ETK_None,
1944 DTN->getQualifier(),
1945 DTN->getIdentifier(),
1946 TemplateArgs);
1947
Douglas Gregor7532dc62009-03-30 22:58:21 +00001948 TemplateDecl *Template = Name.getAsTemplateDecl();
Douglas Gregor6cd9d4a2011-03-04 21:37:14 +00001949 if (!Template || isa<FunctionTemplateDecl>(Template)) {
1950 // We might have a substituted template template parameter pack. If so,
1951 // build a template specialization type for it.
1952 if (Name.getAsSubstTemplateTemplateParmPack())
1953 return Context.getTemplateSpecializationType(Name, TemplateArgs);
Richard Smith3e4c6c42011-05-05 21:57:07 +00001954
Douglas Gregor6cd9d4a2011-03-04 21:37:14 +00001955 Diag(TemplateLoc, diag::err_template_id_not_a_type)
1956 << Name;
1957 NoteAllFoundTemplates(Name);
1958 return QualType();
Douglas Gregorc45c2322009-03-31 00:43:58 +00001959 }
Douglas Gregor7532dc62009-03-30 22:58:21 +00001960
Douglas Gregor40808ce2009-03-09 23:48:35 +00001961 // Check that the template argument list is well-formed for this
1962 // template.
Chris Lattner5f9e2722011-07-23 10:55:15 +00001963 SmallVector<TemplateArgument, 4> Converted;
Douglas Gregorb70126a2012-02-03 17:16:23 +00001964 bool ExpansionIntoFixedList = false;
John McCalld5532b62009-11-23 01:53:49 +00001965 if (CheckTemplateArgumentList(Template, TemplateLoc, TemplateArgs,
Douglas Gregorb70126a2012-02-03 17:16:23 +00001966 false, Converted, &ExpansionIntoFixedList))
Douglas Gregor40808ce2009-03-09 23:48:35 +00001967 return QualType();
1968
Douglas Gregor40808ce2009-03-09 23:48:35 +00001969 QualType CanonType;
1970
Douglas Gregor561f8122011-07-01 01:22:09 +00001971 bool InstantiationDependent = false;
Douglas Gregorb70126a2012-02-03 17:16:23 +00001972 TypeAliasTemplateDecl *AliasTemplate = 0;
1973 if (!ExpansionIntoFixedList &&
1974 (AliasTemplate = dyn_cast<TypeAliasTemplateDecl>(Template))) {
Richard Smith3e4c6c42011-05-05 21:57:07 +00001975 // Find the canonical type for this type alias template specialization.
1976 TypeAliasDecl *Pattern = AliasTemplate->getTemplatedDecl();
1977 if (Pattern->isInvalidDecl())
1978 return QualType();
1979
1980 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
1981 Converted.data(), Converted.size());
1982
1983 // Only substitute for the innermost template argument list.
1984 MultiLevelTemplateArgumentList TemplateArgLists;
Richard Smith18041742011-05-14 15:04:18 +00001985 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
Richard Smithaff37b42011-05-12 00:06:17 +00001986 unsigned Depth = AliasTemplate->getTemplateParameters()->getDepth();
1987 for (unsigned I = 0; I < Depth; ++I)
1988 TemplateArgLists.addOuterTemplateArguments(0, 0);
Richard Smith3e4c6c42011-05-05 21:57:07 +00001989
1990 InstantiatingTemplate Inst(*this, TemplateLoc, Template);
1991 CanonType = SubstType(Pattern->getUnderlyingType(),
1992 TemplateArgLists, AliasTemplate->getLocation(),
1993 AliasTemplate->getDeclName());
1994 if (CanonType.isNull())
1995 return QualType();
1996 } else if (Name.isDependent() ||
1997 TemplateSpecializationType::anyDependentTemplateArguments(
Douglas Gregor561f8122011-07-01 01:22:09 +00001998 TemplateArgs, InstantiationDependent)) {
Douglas Gregor40808ce2009-03-09 23:48:35 +00001999 // This class template specialization is a dependent
2000 // type. Therefore, its canonical type is another class template
2001 // specialization type that contains all of the converted
2002 // arguments in canonical form. This ensures that, e.g., A<T> and
2003 // A<T, T> have identical types when A is declared as:
2004 //
2005 // template<typename T, typename U = T> struct A;
Douglas Gregor25a3ef72009-05-07 06:41:52 +00002006 TemplateName CanonName = Context.getCanonicalTemplateName(Name);
Mike Stump1eb44332009-09-09 15:08:12 +00002007 CanonType = Context.getTemplateSpecializationType(CanonName,
Douglas Gregor910f8002010-11-07 23:05:16 +00002008 Converted.data(),
2009 Converted.size());
Mike Stump1eb44332009-09-09 15:08:12 +00002010
Douglas Gregor1275ae02009-07-28 23:00:59 +00002011 // FIXME: CanonType is not actually the canonical type, and unfortunately
John McCall833ca992009-10-29 08:12:44 +00002012 // it is a TemplateSpecializationType that we will never use again.
Douglas Gregor1275ae02009-07-28 23:00:59 +00002013 // In the future, we need to teach getTemplateSpecializationType to only
2014 // build the canonical type and return that to us.
2015 CanonType = Context.getCanonicalType(CanonType);
John McCall31f17ec2010-04-27 00:57:59 +00002016
2017 // This might work out to be a current instantiation, in which
2018 // case the canonical type needs to be the InjectedClassNameType.
2019 //
2020 // TODO: in theory this could be a simple hashtable lookup; most
2021 // changes to CurContext don't change the set of current
2022 // instantiations.
2023 if (isa<ClassTemplateDecl>(Template)) {
2024 for (DeclContext *Ctx = CurContext; Ctx; Ctx = Ctx->getLookupParent()) {
2025 // If we get out to a namespace, we're done.
2026 if (Ctx->isFileContext()) break;
2027
2028 // If this isn't a record, keep looking.
2029 CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx);
2030 if (!Record) continue;
2031
2032 // Look for one of the two cases with InjectedClassNameTypes
2033 // and check whether it's the same template.
2034 if (!isa<ClassTemplatePartialSpecializationDecl>(Record) &&
2035 !Record->getDescribedClassTemplate())
2036 continue;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002037
John McCall31f17ec2010-04-27 00:57:59 +00002038 // Fetch the injected class name type and check whether its
2039 // injected type is equal to the type we just built.
2040 QualType ICNT = Context.getTypeDeclType(Record);
2041 QualType Injected = cast<InjectedClassNameType>(ICNT)
2042 ->getInjectedSpecializationType();
2043
2044 if (CanonType != Injected->getCanonicalTypeInternal())
2045 continue;
2046
2047 // If so, the canonical type of this TST is the injected
2048 // class name type of the record we just found.
2049 assert(ICNT.isCanonical());
2050 CanonType = ICNT;
John McCall31f17ec2010-04-27 00:57:59 +00002051 break;
2052 }
2053 }
Mike Stump1eb44332009-09-09 15:08:12 +00002054 } else if (ClassTemplateDecl *ClassTemplate
Douglas Gregor7532dc62009-03-30 22:58:21 +00002055 = dyn_cast<ClassTemplateDecl>(Template)) {
Douglas Gregor40808ce2009-03-09 23:48:35 +00002056 // Find the class template specialization declaration that
2057 // corresponds to these arguments.
Douglas Gregor40808ce2009-03-09 23:48:35 +00002058 void *InsertPos = 0;
2059 ClassTemplateSpecializationDecl *Decl
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002060 = ClassTemplate->findSpecialization(Converted.data(), Converted.size(),
Douglas Gregor910f8002010-11-07 23:05:16 +00002061 InsertPos);
Douglas Gregor40808ce2009-03-09 23:48:35 +00002062 if (!Decl) {
2063 // This is the first time we have referenced this class template
2064 // specialization. Create the canonical declaration and add it to
2065 // the set of specializations.
Mike Stump1eb44332009-09-09 15:08:12 +00002066 Decl = ClassTemplateSpecializationDecl::Create(Context,
Douglas Gregor13c85772010-05-06 00:28:52 +00002067 ClassTemplate->getTemplatedDecl()->getTagKind(),
2068 ClassTemplate->getDeclContext(),
Abramo Bagnara09d82122011-10-03 20:34:03 +00002069 ClassTemplate->getTemplatedDecl()->getLocStart(),
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00002070 ClassTemplate->getLocation(),
Douglas Gregor910f8002010-11-07 23:05:16 +00002071 ClassTemplate,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002072 Converted.data(),
Douglas Gregor910f8002010-11-07 23:05:16 +00002073 Converted.size(), 0);
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00002074 ClassTemplate->AddSpecialization(Decl, InsertPos);
Douglas Gregor40808ce2009-03-09 23:48:35 +00002075 Decl->setLexicalDeclContext(CurContext);
2076 }
2077
2078 CanonType = Context.getTypeDeclType(Decl);
John McCall3cb0ebd2010-03-10 03:28:59 +00002079 assert(isa<RecordType>(CanonType) &&
2080 "type of non-dependent specialization is not a RecordType");
Douglas Gregor40808ce2009-03-09 23:48:35 +00002081 }
Mike Stump1eb44332009-09-09 15:08:12 +00002082
Douglas Gregor40808ce2009-03-09 23:48:35 +00002083 // Build the fully-sugared type for this class template
2084 // specialization, which refers back to the class template
2085 // specialization we created or found.
John McCall71d74bc2010-06-13 09:25:03 +00002086 return Context.getTemplateSpecializationType(Name, TemplateArgs, CanonType);
Douglas Gregor40808ce2009-03-09 23:48:35 +00002087}
2088
John McCallf312b1e2010-08-26 23:41:50 +00002089TypeResult
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002090Sema::ActOnTemplateIdType(CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
Douglas Gregor059101f2011-03-02 00:47:37 +00002091 TemplateTy TemplateD, SourceLocation TemplateLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00002092 SourceLocation LAngleLoc,
Douglas Gregor7532dc62009-03-30 22:58:21 +00002093 ASTTemplateArgsPtr TemplateArgsIn,
Abramo Bagnarafad03b72012-01-27 08:46:19 +00002094 SourceLocation RAngleLoc,
2095 bool IsCtorOrDtorName) {
Douglas Gregor059101f2011-03-02 00:47:37 +00002096 if (SS.isInvalid())
2097 return true;
2098
Douglas Gregor7532dc62009-03-30 22:58:21 +00002099 TemplateName Template = TemplateD.getAsVal<TemplateName>();
Douglas Gregor55f6b142009-02-09 18:46:07 +00002100
Douglas Gregor40808ce2009-03-09 23:48:35 +00002101 // Translate the parser's template argument list in our AST format.
John McCalld5532b62009-11-23 01:53:49 +00002102 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
Douglas Gregor314b97f2009-11-10 19:49:08 +00002103 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
Douglas Gregorc15cb382009-02-09 23:23:08 +00002104
Douglas Gregora88f09f2011-02-28 17:23:35 +00002105 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
Abramo Bagnarafad03b72012-01-27 08:46:19 +00002106 QualType T
2107 = Context.getDependentTemplateSpecializationType(ETK_None,
2108 DTN->getQualifier(),
2109 DTN->getIdentifier(),
2110 TemplateArgs);
2111 // Build type-source information.
Douglas Gregora88f09f2011-02-28 17:23:35 +00002112 TypeLocBuilder TLB;
2113 DependentTemplateSpecializationTypeLoc SpecTL
2114 = TLB.push<DependentTemplateSpecializationTypeLoc>(T);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002115 SpecTL.setElaboratedKeywordLoc(SourceLocation());
2116 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
Abramo Bagnara66581d42012-02-06 22:45:07 +00002117 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002118 SpecTL.setTemplateNameLoc(TemplateLoc);
Douglas Gregora88f09f2011-02-28 17:23:35 +00002119 SpecTL.setLAngleLoc(LAngleLoc);
2120 SpecTL.setRAngleLoc(RAngleLoc);
Douglas Gregora88f09f2011-02-28 17:23:35 +00002121 for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I)
2122 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
2123 return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T));
2124 }
2125
John McCalld5532b62009-11-23 01:53:49 +00002126 QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs);
Douglas Gregor40808ce2009-03-09 23:48:35 +00002127 TemplateArgsIn.release();
Douglas Gregor31a19b62009-04-01 21:51:26 +00002128
2129 if (Result.isNull())
2130 return true;
2131
Douglas Gregor059101f2011-03-02 00:47:37 +00002132 // Build type-source information.
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002133 TypeLocBuilder TLB;
Douglas Gregor059101f2011-03-02 00:47:37 +00002134 TemplateSpecializationTypeLoc SpecTL
2135 = TLB.push<TemplateSpecializationTypeLoc>(Result);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002136 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00002137 SpecTL.setTemplateNameLoc(TemplateLoc);
2138 SpecTL.setLAngleLoc(LAngleLoc);
2139 SpecTL.setRAngleLoc(RAngleLoc);
2140 for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i)
2141 SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo());
John McCall833ca992009-10-29 08:12:44 +00002142
Abramo Bagnarafad03b72012-01-27 08:46:19 +00002143 // NOTE: avoid constructing an ElaboratedTypeLoc if this is a
2144 // constructor or destructor name (in such a case, the scope specifier
2145 // will be attached to the enclosing Decl or Expr node).
2146 if (SS.isNotEmpty() && !IsCtorOrDtorName) {
Douglas Gregor059101f2011-03-02 00:47:37 +00002147 // Create an elaborated-type-specifier containing the nested-name-specifier.
2148 Result = Context.getElaboratedType(ETK_None, SS.getScopeRep(), Result);
2149 ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result);
Abramo Bagnara38a42912012-02-06 19:09:27 +00002150 ElabTL.setElaboratedKeywordLoc(SourceLocation());
Douglas Gregor059101f2011-03-02 00:47:37 +00002151 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
2152 }
2153
2154 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
John McCall6b2becf2009-09-08 17:47:29 +00002155}
John McCallf1bbbb42009-09-04 01:14:41 +00002156
Douglas Gregor059101f2011-03-02 00:47:37 +00002157TypeResult Sema::ActOnTagTemplateIdType(TagUseKind TUK,
John McCallf312b1e2010-08-26 23:41:50 +00002158 TypeSpecifierType TagSpec,
Douglas Gregor059101f2011-03-02 00:47:37 +00002159 SourceLocation TagLoc,
2160 CXXScopeSpec &SS,
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002161 SourceLocation TemplateKWLoc,
2162 TemplateTy TemplateD,
Douglas Gregor059101f2011-03-02 00:47:37 +00002163 SourceLocation TemplateLoc,
2164 SourceLocation LAngleLoc,
2165 ASTTemplateArgsPtr TemplateArgsIn,
2166 SourceLocation RAngleLoc) {
2167 TemplateName Template = TemplateD.getAsVal<TemplateName>();
2168
2169 // Translate the parser's template argument list in our AST format.
2170 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
2171 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
2172
2173 // Determine the tag kind
Abramo Bagnara465d41b2010-05-11 21:36:43 +00002174 TagTypeKind TagKind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
Douglas Gregor059101f2011-03-02 00:47:37 +00002175 ElaboratedTypeKeyword Keyword
2176 = TypeWithKeyword::getKeywordForTagTypeKind(TagKind);
Mike Stump1eb44332009-09-09 15:08:12 +00002177
Douglas Gregor059101f2011-03-02 00:47:37 +00002178 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
2179 QualType T = Context.getDependentTemplateSpecializationType(Keyword,
2180 DTN->getQualifier(),
2181 DTN->getIdentifier(),
2182 TemplateArgs);
2183
2184 // Build type-source information.
2185 TypeLocBuilder TLB;
2186 DependentTemplateSpecializationTypeLoc SpecTL
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002187 = TLB.push<DependentTemplateSpecializationTypeLoc>(T);
2188 SpecTL.setElaboratedKeywordLoc(TagLoc);
2189 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
Abramo Bagnara66581d42012-02-06 22:45:07 +00002190 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002191 SpecTL.setTemplateNameLoc(TemplateLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00002192 SpecTL.setLAngleLoc(LAngleLoc);
2193 SpecTL.setRAngleLoc(RAngleLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00002194 for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I)
2195 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
2196 return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T));
2197 }
Richard Smith3e4c6c42011-05-05 21:57:07 +00002198
2199 if (TypeAliasTemplateDecl *TAT =
2200 dyn_cast_or_null<TypeAliasTemplateDecl>(Template.getAsTemplateDecl())) {
2201 // C++0x [dcl.type.elab]p2:
2202 // If the identifier resolves to a typedef-name or the simple-template-id
2203 // resolves to an alias template specialization, the
2204 // elaborated-type-specifier is ill-formed.
2205 Diag(TemplateLoc, diag::err_tag_reference_non_tag) << 4;
2206 Diag(TAT->getLocation(), diag::note_declared_at);
2207 }
Douglas Gregor059101f2011-03-02 00:47:37 +00002208
2209 QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs);
2210 if (Result.isNull())
Matt Beaumont-Gay3a51d412011-08-25 23:22:24 +00002211 return TypeResult(true);
Douglas Gregor059101f2011-03-02 00:47:37 +00002212
2213 // Check the tag kind
2214 if (const RecordType *RT = Result->getAs<RecordType>()) {
John McCall6b2becf2009-09-08 17:47:29 +00002215 RecordDecl *D = RT->getDecl();
Douglas Gregor059101f2011-03-02 00:47:37 +00002216
John McCall6b2becf2009-09-08 17:47:29 +00002217 IdentifierInfo *Id = D->getIdentifier();
2218 assert(Id && "templated class must have an identifier");
Douglas Gregor059101f2011-03-02 00:47:37 +00002219
Richard Trieubbf34c02011-06-10 03:11:26 +00002220 if (!isAcceptableTagRedeclaration(D, TagKind, TUK == TUK_Definition,
2221 TagLoc, *Id)) {
John McCall6b2becf2009-09-08 17:47:29 +00002222 Diag(TagLoc, diag::err_use_with_wrong_tag)
Douglas Gregor059101f2011-03-02 00:47:37 +00002223 << Result
Douglas Gregor849b2432010-03-31 17:46:05 +00002224 << FixItHint::CreateReplacement(SourceRange(TagLoc), D->getKindName());
John McCallc4e70192009-09-11 04:59:25 +00002225 Diag(D->getLocation(), diag::note_previous_use);
John McCallf1bbbb42009-09-04 01:14:41 +00002226 }
2227 }
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002228
Douglas Gregor059101f2011-03-02 00:47:37 +00002229 // Provide source-location information for the template specialization.
2230 TypeLocBuilder TLB;
2231 TemplateSpecializationTypeLoc SpecTL
2232 = TLB.push<TemplateSpecializationTypeLoc>(Result);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002233 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00002234 SpecTL.setTemplateNameLoc(TemplateLoc);
2235 SpecTL.setLAngleLoc(LAngleLoc);
2236 SpecTL.setRAngleLoc(RAngleLoc);
2237 for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i)
2238 SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo());
John McCallf1bbbb42009-09-04 01:14:41 +00002239
Douglas Gregor059101f2011-03-02 00:47:37 +00002240 // Construct an elaborated type containing the nested-name-specifier (if any)
Abramo Bagnara55d23c92012-02-06 14:41:24 +00002241 // and tag keyword.
Douglas Gregor059101f2011-03-02 00:47:37 +00002242 Result = Context.getElaboratedType(Keyword, SS.getScopeRep(), Result);
2243 ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result);
Abramo Bagnara38a42912012-02-06 19:09:27 +00002244 ElabTL.setElaboratedKeywordLoc(TagLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00002245 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
2246 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
Douglas Gregor55f6b142009-02-09 18:46:07 +00002247}
2248
John McCall60d7b3a2010-08-24 06:29:42 +00002249ExprResult Sema::BuildTemplateIdExpr(const CXXScopeSpec &SS,
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002250 SourceLocation TemplateKWLoc,
Douglas Gregor4c9be892011-02-28 20:01:57 +00002251 LookupResult &R,
2252 bool RequiresADL,
Abramo Bagnara9d9922a2012-02-06 14:31:00 +00002253 const TemplateArgumentListInfo *TemplateArgs) {
Douglas Gregoredce4dd2009-06-30 22:34:41 +00002254 // FIXME: Can we do any checking at this point? I guess we could check the
2255 // template arguments that we have against the template name, if the template
Mike Stump1eb44332009-09-09 15:08:12 +00002256 // name refers to a single template. That's not a terribly common case,
Douglas Gregoredce4dd2009-06-30 22:34:41 +00002257 // though.
Douglas Gregor1be8eec2011-02-19 21:32:49 +00002258 // foo<int> could identify a single function unambiguously
2259 // This approach does NOT work, since f<int>(1);
2260 // gets resolved prior to resorting to overload resolution
2261 // i.e., template<class T> void f(double);
2262 // vs template<class T, class U> void f(U);
John McCallf7a1a742009-11-24 19:00:30 +00002263
2264 // These should be filtered out by our callers.
2265 assert(!R.empty() && "empty lookup results when building templateid");
2266 assert(!R.isAmbiguous() && "ambiguous lookup when building templateid");
2267
John McCallc373d482010-01-27 01:50:18 +00002268 // We don't want lookup warnings at this point.
2269 R.suppressDiagnostics();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002270
John McCallf7a1a742009-11-24 19:00:30 +00002271 UnresolvedLookupExpr *ULE
Douglas Gregorbebbe0d2010-12-15 01:34:56 +00002272 = UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
Douglas Gregor4c9be892011-02-28 20:01:57 +00002273 SS.getWithLocInContext(Context),
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002274 TemplateKWLoc,
Abramo Bagnara25777432010-08-11 22:01:17 +00002275 R.getLookupNameInfo(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002276 RequiresADL, TemplateArgs,
Douglas Gregor5a84dec2010-05-23 18:57:34 +00002277 R.begin(), R.end());
John McCallf7a1a742009-11-24 19:00:30 +00002278
2279 return Owned(ULE);
Douglas Gregoredce4dd2009-06-30 22:34:41 +00002280}
2281
John McCallf7a1a742009-11-24 19:00:30 +00002282// We actually only call this from template instantiation.
John McCall60d7b3a2010-08-24 06:29:42 +00002283ExprResult
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00002284Sema::BuildQualifiedTemplateIdExpr(CXXScopeSpec &SS,
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002285 SourceLocation TemplateKWLoc,
Abramo Bagnara25777432010-08-11 22:01:17 +00002286 const DeclarationNameInfo &NameInfo,
Abramo Bagnara9d9922a2012-02-06 14:31:00 +00002287 const TemplateArgumentListInfo *TemplateArgs) {
2288 assert(TemplateArgs || TemplateKWLoc.isValid());
John McCallf7a1a742009-11-24 19:00:30 +00002289 DeclContext *DC;
2290 if (!(DC = computeDeclContext(SS, false)) ||
2291 DC->isDependentContext() ||
John McCall77bb1aa2010-05-01 00:40:08 +00002292 RequireCompleteDeclContext(SS, DC))
Abramo Bagnara9d9922a2012-02-06 14:31:00 +00002293 return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs);
Mike Stump1eb44332009-09-09 15:08:12 +00002294
Douglas Gregor1fd6d442010-05-21 23:18:07 +00002295 bool MemberOfUnknownSpecialization;
Abramo Bagnara25777432010-08-11 22:01:17 +00002296 LookupResult R(*this, NameInfo, LookupOrdinaryName);
Douglas Gregor1fd6d442010-05-21 23:18:07 +00002297 LookupTemplateName(R, (Scope*) 0, SS, QualType(), /*Entering*/ false,
2298 MemberOfUnknownSpecialization);
Mike Stump1eb44332009-09-09 15:08:12 +00002299
John McCallf7a1a742009-11-24 19:00:30 +00002300 if (R.isAmbiguous())
2301 return ExprError();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002302
John McCallf7a1a742009-11-24 19:00:30 +00002303 if (R.empty()) {
Abramo Bagnara25777432010-08-11 22:01:17 +00002304 Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_non_template)
2305 << NameInfo.getName() << SS.getRange();
John McCallf7a1a742009-11-24 19:00:30 +00002306 return ExprError();
2307 }
2308
2309 if (ClassTemplateDecl *Temp = R.getAsSingle<ClassTemplateDecl>()) {
Abramo Bagnara25777432010-08-11 22:01:17 +00002310 Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_class_template)
2311 << (NestedNameSpecifier*) SS.getScopeRep()
2312 << NameInfo.getName() << SS.getRange();
John McCallf7a1a742009-11-24 19:00:30 +00002313 Diag(Temp->getLocation(), diag::note_referenced_class_template);
2314 return ExprError();
2315 }
2316
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002317 return BuildTemplateIdExpr(SS, TemplateKWLoc, R, /*ADL*/ false, TemplateArgs);
Douglas Gregoredce4dd2009-06-30 22:34:41 +00002318}
2319
Douglas Gregorc45c2322009-03-31 00:43:58 +00002320/// \brief Form a dependent template name.
2321///
2322/// This action forms a dependent template name given the template
2323/// name and its (presumably dependent) scope specifier. For
2324/// example, given "MetaFun::template apply", the scope specifier \p
2325/// SS will be "MetaFun::", \p TemplateKWLoc contains the location
2326/// of the "template" keyword, and "apply" is the \p Name.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002327TemplateNameKind Sema::ActOnDependentTemplateName(Scope *S,
Douglas Gregord6ab2322010-06-16 23:00:59 +00002328 CXXScopeSpec &SS,
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002329 SourceLocation TemplateKWLoc,
Douglas Gregord6ab2322010-06-16 23:00:59 +00002330 UnqualifiedId &Name,
John McCallb3d87482010-08-24 05:47:05 +00002331 ParsedType ObjectType,
Douglas Gregord6ab2322010-06-16 23:00:59 +00002332 bool EnteringContext,
2333 TemplateTy &Result) {
Richard Smithebaf0e62011-10-18 20:49:44 +00002334 if (TemplateKWLoc.isValid() && S && !S->getTemplateParamParent())
2335 Diag(TemplateKWLoc,
David Blaikie4e4d0842012-03-11 07:00:24 +00002336 getLangOpts().CPlusPlus0x ?
Richard Smithebaf0e62011-10-18 20:49:44 +00002337 diag::warn_cxx98_compat_template_outside_of_template :
2338 diag::ext_template_outside_of_template)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002339 << FixItHint::CreateRemoval(TemplateKWLoc);
2340
Douglas Gregor0707bc52010-01-19 16:01:07 +00002341 DeclContext *LookupCtx = 0;
2342 if (SS.isSet())
2343 LookupCtx = computeDeclContext(SS, EnteringContext);
2344 if (!LookupCtx && ObjectType)
John McCallb3d87482010-08-24 05:47:05 +00002345 LookupCtx = computeDeclContext(ObjectType.get());
Douglas Gregor0707bc52010-01-19 16:01:07 +00002346 if (LookupCtx) {
Douglas Gregorc45c2322009-03-31 00:43:58 +00002347 // C++0x [temp.names]p5:
2348 // If a name prefixed by the keyword template is not the name of
2349 // a template, the program is ill-formed. [Note: the keyword
2350 // template may not be applied to non-template members of class
2351 // templates. -end note ] [ Note: as is the case with the
2352 // typename prefix, the template prefix is allowed in cases
2353 // where it is not strictly necessary; i.e., when the
2354 // nested-name-specifier or the expression on the left of the ->
2355 // or . is not dependent on a template-parameter, or the use
2356 // does not appear in the scope of a template. -end note]
2357 //
2358 // Note: C++03 was more strict here, because it banned the use of
2359 // the "template" keyword prior to a template-name that was not a
2360 // dependent name. C++ DR468 relaxed this requirement (the
2361 // "template" keyword is now permitted). We follow the C++0x
Douglas Gregor732281d2010-06-14 22:07:54 +00002362 // rules, even in C++03 mode with a warning, retroactively applying the DR.
Douglas Gregor1fd6d442010-05-21 23:18:07 +00002363 bool MemberOfUnknownSpecialization;
Abramo Bagnara7c153532010-08-06 12:11:11 +00002364 TemplateNameKind TNK = isTemplateName(0, SS, TemplateKWLoc.isValid(), Name,
2365 ObjectType, EnteringContext, Result,
Douglas Gregor1fd6d442010-05-21 23:18:07 +00002366 MemberOfUnknownSpecialization);
Douglas Gregor0707bc52010-01-19 16:01:07 +00002367 if (TNK == TNK_Non_template && LookupCtx->isDependentContext() &&
2368 isa<CXXRecordDecl>(LookupCtx) &&
Douglas Gregord078bd22011-03-11 23:27:41 +00002369 (!cast<CXXRecordDecl>(LookupCtx)->hasDefinition() ||
2370 cast<CXXRecordDecl>(LookupCtx)->hasAnyDependentBases())) {
Douglas Gregord6ab2322010-06-16 23:00:59 +00002371 // This is a dependent template. Handle it below.
Douglas Gregor9edad9b2010-01-14 17:47:39 +00002372 } else if (TNK == TNK_Non_template) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00002373 Diag(Name.getLocStart(),
Douglas Gregor014e88d2009-11-03 23:16:33 +00002374 diag::err_template_kw_refers_to_non_template)
Abramo Bagnara25777432010-08-11 22:01:17 +00002375 << GetNameFromUnqualifiedId(Name).getName()
Douglas Gregor0278e122010-05-05 05:58:24 +00002376 << Name.getSourceRange()
2377 << TemplateKWLoc;
Douglas Gregord6ab2322010-06-16 23:00:59 +00002378 return TNK_Non_template;
Douglas Gregor9edad9b2010-01-14 17:47:39 +00002379 } else {
2380 // We found something; return it.
Douglas Gregord6ab2322010-06-16 23:00:59 +00002381 return TNK;
Douglas Gregorc45c2322009-03-31 00:43:58 +00002382 }
Douglas Gregorc45c2322009-03-31 00:43:58 +00002383 }
2384
Mike Stump1eb44332009-09-09 15:08:12 +00002385 NestedNameSpecifier *Qualifier
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002386 = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002387
Douglas Gregor014e88d2009-11-03 23:16:33 +00002388 switch (Name.getKind()) {
2389 case UnqualifiedId::IK_Identifier:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002390 Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier,
Douglas Gregord6ab2322010-06-16 23:00:59 +00002391 Name.Identifier));
2392 return TNK_Dependent_template_name;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002393
Douglas Gregorca1bdd72009-11-04 00:56:37 +00002394 case UnqualifiedId::IK_OperatorFunctionId:
Douglas Gregord6ab2322010-06-16 23:00:59 +00002395 Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier,
Douglas Gregorca1bdd72009-11-04 00:56:37 +00002396 Name.OperatorFunctionId.Operator));
Douglas Gregord6ab2322010-06-16 23:00:59 +00002397 return TNK_Dependent_template_name;
Sean Hunte6252d12009-11-28 08:58:14 +00002398
2399 case UnqualifiedId::IK_LiteralOperatorId:
David Blaikieb219cfc2011-09-23 05:06:16 +00002400 llvm_unreachable(
2401 "We don't support these; Parse shouldn't have allowed propagation");
Sean Hunte6252d12009-11-28 08:58:14 +00002402
Douglas Gregor014e88d2009-11-03 23:16:33 +00002403 default:
2404 break;
2405 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002406
Daniel Dunbar96a00142012-03-09 18:35:03 +00002407 Diag(Name.getLocStart(),
Douglas Gregor014e88d2009-11-03 23:16:33 +00002408 diag::err_template_kw_refers_to_non_template)
Abramo Bagnara25777432010-08-11 22:01:17 +00002409 << GetNameFromUnqualifiedId(Name).getName()
Douglas Gregor0278e122010-05-05 05:58:24 +00002410 << Name.getSourceRange()
2411 << TemplateKWLoc;
Douglas Gregord6ab2322010-06-16 23:00:59 +00002412 return TNK_Non_template;
Douglas Gregorc45c2322009-03-31 00:43:58 +00002413}
2414
Mike Stump1eb44332009-09-09 15:08:12 +00002415bool Sema::CheckTemplateTypeArgument(TemplateTypeParmDecl *Param,
John McCall833ca992009-10-29 08:12:44 +00002416 const TemplateArgumentLoc &AL,
Chris Lattner5f9e2722011-07-23 10:55:15 +00002417 SmallVectorImpl<TemplateArgument> &Converted) {
John McCall833ca992009-10-29 08:12:44 +00002418 const TemplateArgument &Arg = AL.getArgument();
2419
Anders Carlsson436b1562009-06-13 00:33:33 +00002420 // Check template type parameter.
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00002421 switch(Arg.getKind()) {
2422 case TemplateArgument::Type:
Anders Carlsson436b1562009-06-13 00:33:33 +00002423 // C++ [temp.arg.type]p1:
2424 // A template-argument for a template-parameter which is a
2425 // type shall be a type-id.
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00002426 break;
2427 case TemplateArgument::Template: {
2428 // We have a template type parameter but the template argument
2429 // is a template without any arguments.
2430 SourceRange SR = AL.getSourceRange();
2431 TemplateName Name = Arg.getAsTemplate();
2432 Diag(SR.getBegin(), diag::err_template_missing_args)
2433 << Name << SR;
2434 if (TemplateDecl *Decl = Name.getAsTemplateDecl())
2435 Diag(Decl->getLocation(), diag::note_template_decl_here);
Anders Carlsson436b1562009-06-13 00:33:33 +00002436
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00002437 return true;
2438 }
2439 default: {
Anders Carlsson436b1562009-06-13 00:33:33 +00002440 // We have a template type parameter but the template argument
2441 // is not a type.
John McCall828bff22009-10-29 18:45:58 +00002442 SourceRange SR = AL.getSourceRange();
2443 Diag(SR.getBegin(), diag::err_template_arg_must_be_type) << SR;
Anders Carlsson436b1562009-06-13 00:33:33 +00002444 Diag(Param->getLocation(), diag::note_template_param_here);
Mike Stump1eb44332009-09-09 15:08:12 +00002445
Anders Carlsson436b1562009-06-13 00:33:33 +00002446 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00002447 }
Jeffrey Yasskindb88d8a2010-04-08 00:03:06 +00002448 }
Anders Carlsson436b1562009-06-13 00:33:33 +00002449
John McCalla93c9342009-12-07 02:54:59 +00002450 if (CheckTemplateArgument(Param, AL.getTypeSourceInfo()))
Anders Carlsson436b1562009-06-13 00:33:33 +00002451 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00002452
Anders Carlsson436b1562009-06-13 00:33:33 +00002453 // Add the converted template type argument.
Douglas Gregore559ca12011-06-17 22:11:49 +00002454 QualType ArgType = Context.getCanonicalType(Arg.getAsType());
2455
2456 // Objective-C ARC:
2457 // If an explicitly-specified template argument type is a lifetime type
2458 // with no lifetime qualifier, the __strong lifetime qualifier is inferred.
David Blaikie4e4d0842012-03-11 07:00:24 +00002459 if (getLangOpts().ObjCAutoRefCount &&
Douglas Gregore559ca12011-06-17 22:11:49 +00002460 ArgType->isObjCLifetimeType() &&
2461 !ArgType.getObjCLifetime()) {
2462 Qualifiers Qs;
2463 Qs.setObjCLifetime(Qualifiers::OCL_Strong);
2464 ArgType = Context.getQualifiedType(ArgType, Qs);
2465 }
2466
2467 Converted.push_back(TemplateArgument(ArgType));
Anders Carlsson436b1562009-06-13 00:33:33 +00002468 return false;
2469}
2470
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002471/// \brief Substitute template arguments into the default template argument for
2472/// the given template type parameter.
2473///
2474/// \param SemaRef the semantic analysis object for which we are performing
2475/// the substitution.
2476///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002477/// \param Template the template that we are synthesizing template arguments
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002478/// for.
2479///
2480/// \param TemplateLoc the location of the template name that started the
2481/// template-id we are checking.
2482///
2483/// \param RAngleLoc the location of the right angle bracket ('>') that
2484/// terminates the template-id.
2485///
2486/// \param Param the template template parameter whose default we are
2487/// substituting into.
2488///
2489/// \param Converted the list of template arguments provided for template
2490/// parameters that precede \p Param in the template parameter list.
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002491/// \returns the substituted template argument, or NULL if an error occurred.
John McCalla93c9342009-12-07 02:54:59 +00002492static TypeSourceInfo *
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002493SubstDefaultTemplateArgument(Sema &SemaRef,
2494 TemplateDecl *Template,
2495 SourceLocation TemplateLoc,
2496 SourceLocation RAngleLoc,
2497 TemplateTypeParmDecl *Param,
Chris Lattner5f9e2722011-07-23 10:55:15 +00002498 SmallVectorImpl<TemplateArgument> &Converted) {
John McCalla93c9342009-12-07 02:54:59 +00002499 TypeSourceInfo *ArgType = Param->getDefaultArgumentInfo();
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002500
2501 // If the argument type is dependent, instantiate it now based
2502 // on the previously-computed template arguments.
2503 if (ArgType->getType()->isDependentType()) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002504 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
Douglas Gregor910f8002010-11-07 23:05:16 +00002505 Converted.data(), Converted.size());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002506
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002507 MultiLevelTemplateArgumentList AllTemplateArgs
2508 = SemaRef.getTemplateInstantiationArgs(Template, &TemplateArgs);
2509
2510 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
Douglas Gregor910f8002010-11-07 23:05:16 +00002511 Template, Converted.data(),
2512 Converted.size(),
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002513 SourceRange(TemplateLoc, RAngleLoc));
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002514
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002515 ArgType = SemaRef.SubstType(ArgType, AllTemplateArgs,
2516 Param->getDefaultArgumentLoc(),
2517 Param->getDeclName());
2518 }
2519
2520 return ArgType;
2521}
2522
2523/// \brief Substitute template arguments into the default template argument for
2524/// the given non-type template parameter.
2525///
2526/// \param SemaRef the semantic analysis object for which we are performing
2527/// the substitution.
2528///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002529/// \param Template the template that we are synthesizing template arguments
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002530/// for.
2531///
2532/// \param TemplateLoc the location of the template name that started the
2533/// template-id we are checking.
2534///
2535/// \param RAngleLoc the location of the right angle bracket ('>') that
2536/// terminates the template-id.
2537///
Douglas Gregor788cd062009-11-11 01:00:40 +00002538/// \param Param the non-type template parameter whose default we are
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002539/// substituting into.
2540///
2541/// \param Converted the list of template arguments provided for template
2542/// parameters that precede \p Param in the template parameter list.
2543///
2544/// \returns the substituted template argument, or NULL if an error occurred.
John McCall60d7b3a2010-08-24 06:29:42 +00002545static ExprResult
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002546SubstDefaultTemplateArgument(Sema &SemaRef,
2547 TemplateDecl *Template,
2548 SourceLocation TemplateLoc,
2549 SourceLocation RAngleLoc,
2550 NonTypeTemplateParmDecl *Param,
Chris Lattner5f9e2722011-07-23 10:55:15 +00002551 SmallVectorImpl<TemplateArgument> &Converted) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002552 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
Douglas Gregor910f8002010-11-07 23:05:16 +00002553 Converted.data(), Converted.size());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002554
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002555 MultiLevelTemplateArgumentList AllTemplateArgs
2556 = SemaRef.getTemplateInstantiationArgs(Template, &TemplateArgs);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002557
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002558 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
Douglas Gregor910f8002010-11-07 23:05:16 +00002559 Template, Converted.data(),
2560 Converted.size(),
Douglas Gregor0f8716b2009-11-09 19:17:50 +00002561 SourceRange(TemplateLoc, RAngleLoc));
2562
2563 return SemaRef.SubstExpr(Param->getDefaultArgument(), AllTemplateArgs);
2564}
2565
Douglas Gregor788cd062009-11-11 01:00:40 +00002566/// \brief Substitute template arguments into the default template argument for
2567/// the given template template parameter.
2568///
2569/// \param SemaRef the semantic analysis object for which we are performing
2570/// the substitution.
2571///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002572/// \param Template the template that we are synthesizing template arguments
Douglas Gregor788cd062009-11-11 01:00:40 +00002573/// for.
2574///
2575/// \param TemplateLoc the location of the template name that started the
2576/// template-id we are checking.
2577///
2578/// \param RAngleLoc the location of the right angle bracket ('>') that
2579/// terminates the template-id.
2580///
2581/// \param Param the template template parameter whose default we are
2582/// substituting into.
2583///
2584/// \param Converted the list of template arguments provided for template
2585/// parameters that precede \p Param in the template parameter list.
2586///
Douglas Gregor1d752d72011-03-02 18:46:51 +00002587/// \param QualifierLoc Will be set to the nested-name-specifier (with
2588/// source-location information) that precedes the template name.
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002589///
Douglas Gregor788cd062009-11-11 01:00:40 +00002590/// \returns the substituted template argument, or NULL if an error occurred.
2591static TemplateName
2592SubstDefaultTemplateArgument(Sema &SemaRef,
2593 TemplateDecl *Template,
2594 SourceLocation TemplateLoc,
2595 SourceLocation RAngleLoc,
2596 TemplateTemplateParmDecl *Param,
Chris Lattner5f9e2722011-07-23 10:55:15 +00002597 SmallVectorImpl<TemplateArgument> &Converted,
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002598 NestedNameSpecifierLoc &QualifierLoc) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002599 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
Douglas Gregor910f8002010-11-07 23:05:16 +00002600 Converted.data(), Converted.size());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002601
Douglas Gregor788cd062009-11-11 01:00:40 +00002602 MultiLevelTemplateArgumentList AllTemplateArgs
2603 = SemaRef.getTemplateInstantiationArgs(Template, &TemplateArgs);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002604
Douglas Gregor788cd062009-11-11 01:00:40 +00002605 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
Douglas Gregor910f8002010-11-07 23:05:16 +00002606 Template, Converted.data(),
2607 Converted.size(),
Douglas Gregor788cd062009-11-11 01:00:40 +00002608 SourceRange(TemplateLoc, RAngleLoc));
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002609
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002610 // Substitute into the nested-name-specifier first,
Douglas Gregor1d752d72011-03-02 18:46:51 +00002611 QualifierLoc = Param->getDefaultArgument().getTemplateQualifierLoc();
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002612 if (QualifierLoc) {
2613 QualifierLoc = SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc,
2614 AllTemplateArgs);
2615 if (!QualifierLoc)
2616 return TemplateName();
2617 }
2618
Douglas Gregor1d752d72011-03-02 18:46:51 +00002619 return SemaRef.SubstTemplateName(QualifierLoc,
Douglas Gregor788cd062009-11-11 01:00:40 +00002620 Param->getDefaultArgument().getArgument().getAsTemplate(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002621 Param->getDefaultArgument().getTemplateNameLoc(),
Douglas Gregor788cd062009-11-11 01:00:40 +00002622 AllTemplateArgs);
2623}
2624
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002625/// \brief If the given template parameter has a default template
2626/// argument, substitute into that default template argument and
2627/// return the corresponding template argument.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002628TemplateArgumentLoc
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002629Sema::SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template,
2630 SourceLocation TemplateLoc,
2631 SourceLocation RAngleLoc,
2632 Decl *Param,
Chris Lattner5f9e2722011-07-23 10:55:15 +00002633 SmallVectorImpl<TemplateArgument> &Converted) {
Douglas Gregor910f8002010-11-07 23:05:16 +00002634 if (TemplateTypeParmDecl *TypeParm = dyn_cast<TemplateTypeParmDecl>(Param)) {
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002635 if (!TypeParm->hasDefaultArgument())
2636 return TemplateArgumentLoc();
2637
John McCalla93c9342009-12-07 02:54:59 +00002638 TypeSourceInfo *DI = SubstDefaultTemplateArgument(*this, Template,
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002639 TemplateLoc,
2640 RAngleLoc,
2641 TypeParm,
2642 Converted);
2643 if (DI)
2644 return TemplateArgumentLoc(TemplateArgument(DI->getType()), DI);
2645
2646 return TemplateArgumentLoc();
2647 }
2648
2649 if (NonTypeTemplateParmDecl *NonTypeParm
2650 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
2651 if (!NonTypeParm->hasDefaultArgument())
2652 return TemplateArgumentLoc();
2653
John McCall60d7b3a2010-08-24 06:29:42 +00002654 ExprResult Arg = SubstDefaultTemplateArgument(*this, Template,
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002655 TemplateLoc,
2656 RAngleLoc,
2657 NonTypeParm,
2658 Converted);
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002659 if (Arg.isInvalid())
2660 return TemplateArgumentLoc();
2661
2662 Expr *ArgE = Arg.takeAs<Expr>();
2663 return TemplateArgumentLoc(TemplateArgument(ArgE), ArgE);
2664 }
2665
2666 TemplateTemplateParmDecl *TempTempParm
2667 = cast<TemplateTemplateParmDecl>(Param);
2668 if (!TempTempParm->hasDefaultArgument())
2669 return TemplateArgumentLoc();
2670
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002671
Douglas Gregor1d752d72011-03-02 18:46:51 +00002672 NestedNameSpecifierLoc QualifierLoc;
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002673 TemplateName TName = SubstDefaultTemplateArgument(*this, Template,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002674 TemplateLoc,
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002675 RAngleLoc,
2676 TempTempParm,
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002677 Converted,
2678 QualifierLoc);
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002679 if (TName.isNull())
2680 return TemplateArgumentLoc();
2681
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002682 return TemplateArgumentLoc(TemplateArgument(TName),
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002683 TempTempParm->getDefaultArgument().getTemplateQualifierLoc(),
Douglas Gregor51ffb0c2009-11-25 18:55:14 +00002684 TempTempParm->getDefaultArgument().getTemplateNameLoc());
2685}
2686
Douglas Gregore7526412009-11-11 19:31:23 +00002687/// \brief Check that the given template argument corresponds to the given
2688/// template parameter.
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002689///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002690/// \param Param The template parameter against which the argument will be
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002691/// checked.
2692///
2693/// \param Arg The template argument.
2694///
2695/// \param Template The template in which the template argument resides.
2696///
2697/// \param TemplateLoc The location of the template name for the template
2698/// whose argument list we're matching.
2699///
2700/// \param RAngleLoc The location of the right angle bracket ('>') that closes
2701/// the template argument list.
2702///
2703/// \param ArgumentPackIndex The index into the argument pack where this
2704/// argument will be placed. Only valid if the parameter is a parameter pack.
2705///
2706/// \param Converted The checked, converted argument will be added to the
2707/// end of this small vector.
2708///
2709/// \param CTAK Describes how we arrived at this particular template argument:
2710/// explicitly written, deduced, etc.
2711///
2712/// \returns true on error, false otherwise.
Douglas Gregore7526412009-11-11 19:31:23 +00002713bool Sema::CheckTemplateArgument(NamedDecl *Param,
2714 const TemplateArgumentLoc &Arg,
Douglas Gregor54c53cc2011-01-04 23:35:54 +00002715 NamedDecl *Template,
Douglas Gregore7526412009-11-11 19:31:23 +00002716 SourceLocation TemplateLoc,
Douglas Gregore7526412009-11-11 19:31:23 +00002717 SourceLocation RAngleLoc,
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002718 unsigned ArgumentPackIndex,
Chris Lattner5f9e2722011-07-23 10:55:15 +00002719 SmallVectorImpl<TemplateArgument> &Converted,
Douglas Gregor02024a92010-03-28 02:42:43 +00002720 CheckTemplateArgumentKind CTAK) {
Douglas Gregord9e15302009-11-11 19:41:09 +00002721 // Check template type parameters.
2722 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param))
Douglas Gregore7526412009-11-11 19:31:23 +00002723 return CheckTemplateTypeArgument(TTP, Arg, Converted);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002724
Douglas Gregord9e15302009-11-11 19:41:09 +00002725 // Check non-type template parameters.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002726 if (NonTypeTemplateParmDecl *NTTP =dyn_cast<NonTypeTemplateParmDecl>(Param)) {
Douglas Gregore7526412009-11-11 19:31:23 +00002727 // Do substitution on the type of the non-type template parameter
Peter Collingbourne9f6f6a12010-12-10 17:08:53 +00002728 // with the template arguments we've seen thus far. But if the
2729 // template has a dependent context then we cannot substitute yet.
Douglas Gregore7526412009-11-11 19:31:23 +00002730 QualType NTTPType = NTTP->getType();
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002731 if (NTTP->isParameterPack() && NTTP->isExpandedParameterPack())
2732 NTTPType = NTTP->getExpansionType(ArgumentPackIndex);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002733
Peter Collingbourne9f6f6a12010-12-10 17:08:53 +00002734 if (NTTPType->isDependentType() &&
2735 !isa<TemplateTemplateParmDecl>(Template) &&
2736 !Template->getDeclContext()->isDependentContext()) {
Douglas Gregore7526412009-11-11 19:31:23 +00002737 // Do substitution on the type of the non-type template parameter.
2738 InstantiatingTemplate Inst(*this, TemplateLoc, Template,
Douglas Gregor910f8002010-11-07 23:05:16 +00002739 NTTP, Converted.data(), Converted.size(),
Douglas Gregore7526412009-11-11 19:31:23 +00002740 SourceRange(TemplateLoc, RAngleLoc));
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002741
2742 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
Douglas Gregor910f8002010-11-07 23:05:16 +00002743 Converted.data(), Converted.size());
Douglas Gregore7526412009-11-11 19:31:23 +00002744 NTTPType = SubstType(NTTPType,
2745 MultiLevelTemplateArgumentList(TemplateArgs),
2746 NTTP->getLocation(),
2747 NTTP->getDeclName());
2748 // If that worked, check the non-type template parameter type
2749 // for validity.
2750 if (!NTTPType.isNull())
2751 NTTPType = CheckNonTypeTemplateParameterType(NTTPType,
2752 NTTP->getLocation());
2753 if (NTTPType.isNull())
2754 return true;
2755 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002756
Douglas Gregore7526412009-11-11 19:31:23 +00002757 switch (Arg.getArgument().getKind()) {
2758 case TemplateArgument::Null:
David Blaikieb219cfc2011-09-23 05:06:16 +00002759 llvm_unreachable("Should never see a NULL template argument here");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002760
Douglas Gregore7526412009-11-11 19:31:23 +00002761 case TemplateArgument::Expression: {
Douglas Gregore7526412009-11-11 19:31:23 +00002762 TemplateArgument Result;
John Wiegley429bb272011-04-08 18:41:53 +00002763 ExprResult Res =
2764 CheckTemplateArgument(NTTP, NTTPType, Arg.getArgument().getAsExpr(),
2765 Result, CTAK);
2766 if (Res.isInvalid())
Douglas Gregore7526412009-11-11 19:31:23 +00002767 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002768
Douglas Gregor910f8002010-11-07 23:05:16 +00002769 Converted.push_back(Result);
Douglas Gregore7526412009-11-11 19:31:23 +00002770 break;
2771 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002772
Douglas Gregore7526412009-11-11 19:31:23 +00002773 case TemplateArgument::Declaration:
2774 case TemplateArgument::Integral:
2775 // We've already checked this template argument, so just copy
2776 // it to the list of converted arguments.
Douglas Gregor910f8002010-11-07 23:05:16 +00002777 Converted.push_back(Arg.getArgument());
Douglas Gregore7526412009-11-11 19:31:23 +00002778 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002779
Douglas Gregore7526412009-11-11 19:31:23 +00002780 case TemplateArgument::Template:
Douglas Gregora7fc9012011-01-05 18:58:31 +00002781 case TemplateArgument::TemplateExpansion:
Douglas Gregore7526412009-11-11 19:31:23 +00002782 // We were given a template template argument. It may not be ill-formed;
2783 // see below.
2784 if (DependentTemplateName *DTN
Douglas Gregora7fc9012011-01-05 18:58:31 +00002785 = Arg.getArgument().getAsTemplateOrTemplatePattern()
2786 .getAsDependentTemplateName()) {
Douglas Gregore7526412009-11-11 19:31:23 +00002787 // We have a template argument such as \c T::template X, which we
2788 // parsed as a template template argument. However, since we now
2789 // know that we need a non-type template argument, convert this
Abramo Bagnara25777432010-08-11 22:01:17 +00002790 // template name into an expression.
2791
2792 DeclarationNameInfo NameInfo(DTN->getIdentifier(),
2793 Arg.getTemplateNameLoc());
2794
Douglas Gregor00cf3cc2011-02-25 20:49:16 +00002795 CXXScopeSpec SS;
Douglas Gregorb6744ef2011-03-02 17:09:35 +00002796 SS.Adopt(Arg.getTemplateQualifierLoc());
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002797 // FIXME: the template-template arg was a DependentTemplateName,
2798 // so it was provided with a template keyword. However, its source
2799 // location is not stored in the template argument structure.
2800 SourceLocation TemplateKWLoc;
John Wiegley429bb272011-04-08 18:41:53 +00002801 ExprResult E = Owned(DependentScopeDeclRefExpr::Create(Context,
Douglas Gregor00cf3cc2011-02-25 20:49:16 +00002802 SS.getWithLocInContext(Context),
Abramo Bagnarae4b92762012-01-27 09:46:47 +00002803 TemplateKWLoc,
2804 NameInfo, 0));
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002805
Douglas Gregora7fc9012011-01-05 18:58:31 +00002806 // If we parsed the template argument as a pack expansion, create a
2807 // pack expansion expression.
2808 if (Arg.getArgument().getKind() == TemplateArgument::TemplateExpansion){
John Wiegley429bb272011-04-08 18:41:53 +00002809 E = ActOnPackExpansion(E.take(), Arg.getTemplateEllipsisLoc());
2810 if (E.isInvalid())
Douglas Gregora7fc9012011-01-05 18:58:31 +00002811 return true;
Douglas Gregora7fc9012011-01-05 18:58:31 +00002812 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002813
Douglas Gregore7526412009-11-11 19:31:23 +00002814 TemplateArgument Result;
John Wiegley429bb272011-04-08 18:41:53 +00002815 E = CheckTemplateArgument(NTTP, NTTPType, E.take(), Result);
2816 if (E.isInvalid())
Douglas Gregore7526412009-11-11 19:31:23 +00002817 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002818
Douglas Gregor910f8002010-11-07 23:05:16 +00002819 Converted.push_back(Result);
Douglas Gregore7526412009-11-11 19:31:23 +00002820 break;
2821 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002822
Douglas Gregore7526412009-11-11 19:31:23 +00002823 // We have a template argument that actually does refer to a class
Richard Smith3e4c6c42011-05-05 21:57:07 +00002824 // template, alias template, or template template parameter, and
Douglas Gregore7526412009-11-11 19:31:23 +00002825 // therefore cannot be a non-type template argument.
2826 Diag(Arg.getLocation(), diag::err_template_arg_must_be_expr)
2827 << Arg.getSourceRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002828
Douglas Gregore7526412009-11-11 19:31:23 +00002829 Diag(Param->getLocation(), diag::note_template_param_here);
2830 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002831
Douglas Gregore7526412009-11-11 19:31:23 +00002832 case TemplateArgument::Type: {
2833 // We have a non-type template parameter but the template
2834 // argument is a type.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002835
Douglas Gregore7526412009-11-11 19:31:23 +00002836 // C++ [temp.arg]p2:
2837 // In a template-argument, an ambiguity between a type-id and
2838 // an expression is resolved to a type-id, regardless of the
2839 // form of the corresponding template-parameter.
2840 //
2841 // We warn specifically about this case, since it can be rather
2842 // confusing for users.
2843 QualType T = Arg.getArgument().getAsType();
2844 SourceRange SR = Arg.getSourceRange();
2845 if (T->isFunctionType())
2846 Diag(SR.getBegin(), diag::err_template_arg_nontype_ambig) << SR << T;
2847 else
2848 Diag(SR.getBegin(), diag::err_template_arg_must_be_expr) << SR;
2849 Diag(Param->getLocation(), diag::note_template_param_here);
2850 return true;
2851 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002852
Douglas Gregore7526412009-11-11 19:31:23 +00002853 case TemplateArgument::Pack:
Jeffrey Yasskin9f61aa92009-12-12 05:05:38 +00002854 llvm_unreachable("Caller must expand template argument packs");
Douglas Gregore7526412009-11-11 19:31:23 +00002855 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002856
Douglas Gregore7526412009-11-11 19:31:23 +00002857 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002858 }
2859
2860
Douglas Gregore7526412009-11-11 19:31:23 +00002861 // Check template template parameters.
2862 TemplateTemplateParmDecl *TempParm = cast<TemplateTemplateParmDecl>(Param);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002863
Douglas Gregore7526412009-11-11 19:31:23 +00002864 // Substitute into the template parameter list of the template
2865 // template parameter, since previously-supplied template arguments
2866 // may appear within the template template parameter.
2867 {
2868 // Set up a template instantiation context.
2869 LocalInstantiationScope Scope(*this);
2870 InstantiatingTemplate Inst(*this, TemplateLoc, Template,
Douglas Gregor910f8002010-11-07 23:05:16 +00002871 TempParm, Converted.data(), Converted.size(),
Douglas Gregore7526412009-11-11 19:31:23 +00002872 SourceRange(TemplateLoc, RAngleLoc));
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002873
2874 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
Douglas Gregor910f8002010-11-07 23:05:16 +00002875 Converted.data(), Converted.size());
Douglas Gregore7526412009-11-11 19:31:23 +00002876 TempParm = cast_or_null<TemplateTemplateParmDecl>(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002877 SubstDecl(TempParm, CurContext,
Douglas Gregore7526412009-11-11 19:31:23 +00002878 MultiLevelTemplateArgumentList(TemplateArgs)));
2879 if (!TempParm)
2880 return true;
Douglas Gregore7526412009-11-11 19:31:23 +00002881 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002882
Douglas Gregore7526412009-11-11 19:31:23 +00002883 switch (Arg.getArgument().getKind()) {
2884 case TemplateArgument::Null:
David Blaikieb219cfc2011-09-23 05:06:16 +00002885 llvm_unreachable("Should never see a NULL template argument here");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002886
Douglas Gregore7526412009-11-11 19:31:23 +00002887 case TemplateArgument::Template:
Douglas Gregora7fc9012011-01-05 18:58:31 +00002888 case TemplateArgument::TemplateExpansion:
Douglas Gregore7526412009-11-11 19:31:23 +00002889 if (CheckTemplateArgument(TempParm, Arg))
2890 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002891
Douglas Gregor910f8002010-11-07 23:05:16 +00002892 Converted.push_back(Arg.getArgument());
Douglas Gregore7526412009-11-11 19:31:23 +00002893 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002894
Douglas Gregore7526412009-11-11 19:31:23 +00002895 case TemplateArgument::Expression:
2896 case TemplateArgument::Type:
2897 // We have a template template parameter but the template
2898 // argument does not refer to a template.
Richard Smith3e4c6c42011-05-05 21:57:07 +00002899 Diag(Arg.getLocation(), diag::err_template_arg_must_be_template)
David Blaikie4e4d0842012-03-11 07:00:24 +00002900 << getLangOpts().CPlusPlus0x;
Douglas Gregore7526412009-11-11 19:31:23 +00002901 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002902
Douglas Gregore7526412009-11-11 19:31:23 +00002903 case TemplateArgument::Declaration:
David Blaikie7530c032012-01-17 06:56:22 +00002904 llvm_unreachable("Declaration argument with template template parameter");
Douglas Gregore7526412009-11-11 19:31:23 +00002905 case TemplateArgument::Integral:
David Blaikie7530c032012-01-17 06:56:22 +00002906 llvm_unreachable("Integral argument with template template parameter");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002907
Douglas Gregore7526412009-11-11 19:31:23 +00002908 case TemplateArgument::Pack:
Jeffrey Yasskin9f61aa92009-12-12 05:05:38 +00002909 llvm_unreachable("Caller must expand template argument packs");
Douglas Gregore7526412009-11-11 19:31:23 +00002910 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002911
Douglas Gregore7526412009-11-11 19:31:23 +00002912 return false;
2913}
2914
Douglas Gregor8fbbae52012-02-03 07:34:46 +00002915/// \brief Diagnose an arity mismatch in the
2916static bool diagnoseArityMismatch(Sema &S, TemplateDecl *Template,
2917 SourceLocation TemplateLoc,
2918 TemplateArgumentListInfo &TemplateArgs) {
2919 TemplateParameterList *Params = Template->getTemplateParameters();
2920 unsigned NumParams = Params->size();
2921 unsigned NumArgs = TemplateArgs.size();
2922
2923 SourceRange Range;
2924 if (NumArgs > NumParams)
2925 Range = SourceRange(TemplateArgs[NumParams].getLocation(),
2926 TemplateArgs.getRAngleLoc());
2927 S.Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
2928 << (NumArgs > NumParams)
2929 << (isa<ClassTemplateDecl>(Template)? 0 :
2930 isa<FunctionTemplateDecl>(Template)? 1 :
2931 isa<TemplateTemplateParmDecl>(Template)? 2 : 3)
2932 << Template << Range;
2933 S.Diag(Template->getLocation(), diag::note_template_decl_here)
2934 << Params->getSourceRange();
2935 return true;
2936}
2937
Douglas Gregorc15cb382009-02-09 23:23:08 +00002938/// \brief Check that the given template argument list is well-formed
2939/// for specializing the given template.
2940bool Sema::CheckTemplateArgumentList(TemplateDecl *Template,
2941 SourceLocation TemplateLoc,
Douglas Gregor67714232011-03-03 02:41:12 +00002942 TemplateArgumentListInfo &TemplateArgs,
Douglas Gregor16134c62009-07-01 00:28:38 +00002943 bool PartialTemplateArgs,
Douglas Gregorb70126a2012-02-03 17:16:23 +00002944 SmallVectorImpl<TemplateArgument> &Converted,
2945 bool *ExpansionIntoFixedList) {
2946 if (ExpansionIntoFixedList)
2947 *ExpansionIntoFixedList = false;
2948
Douglas Gregorc15cb382009-02-09 23:23:08 +00002949 TemplateParameterList *Params = Template->getTemplateParameters();
2950 unsigned NumParams = Params->size();
John McCalld5532b62009-11-23 01:53:49 +00002951 unsigned NumArgs = TemplateArgs.size();
Douglas Gregorc15cb382009-02-09 23:23:08 +00002952 bool Invalid = false;
2953
John McCalld5532b62009-11-23 01:53:49 +00002954 SourceLocation RAngleLoc = TemplateArgs.getRAngleLoc();
2955
Mike Stump1eb44332009-09-09 15:08:12 +00002956 bool HasParameterPack =
Anders Carlsson0ceffb52009-06-13 02:08:00 +00002957 NumParams > 0 && Params->getParam(NumParams - 1)->isTemplateParameterPack();
Douglas Gregorb70126a2012-02-03 17:16:23 +00002958
Mike Stump1eb44332009-09-09 15:08:12 +00002959 // C++ [temp.arg]p1:
Douglas Gregorc15cb382009-02-09 23:23:08 +00002960 // [...] The type and form of each template-argument specified in
2961 // a template-id shall match the type and form specified for the
2962 // corresponding parameter declared by the template in its
2963 // template-parameter-list.
Douglas Gregor67714232011-03-03 02:41:12 +00002964 bool isTemplateTemplateParameter = isa<TemplateTemplateParmDecl>(Template);
Chris Lattner5f9e2722011-07-23 10:55:15 +00002965 SmallVector<TemplateArgument, 2> ArgumentPack;
Douglas Gregor14be16b2010-12-20 16:57:52 +00002966 TemplateParameterList::iterator Param = Params->begin(),
2967 ParamEnd = Params->end();
Douglas Gregorc15cb382009-02-09 23:23:08 +00002968 unsigned ArgIdx = 0;
Douglas Gregor8dde14e2011-01-24 16:14:37 +00002969 LocalInstantiationScope InstScope(*this, true);
Douglas Gregor8fbbae52012-02-03 07:34:46 +00002970 bool SawPackExpansion = false;
Douglas Gregor14be16b2010-12-20 16:57:52 +00002971 while (Param != ParamEnd) {
Douglas Gregorf35f8282009-11-11 21:54:23 +00002972 if (ArgIdx < NumArgs) {
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002973 // If we have an expanded parameter pack, make sure we don't have too
2974 // many arguments.
Douglas Gregor8fbbae52012-02-03 07:34:46 +00002975 // FIXME: This really should fall out from the normal arity checking.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002976 if (NonTypeTemplateParmDecl *NTTP
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002977 = dyn_cast<NonTypeTemplateParmDecl>(*Param)) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002978 if (NTTP->isExpandedParameterPack() &&
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002979 ArgumentPack.size() >= NTTP->getNumExpansionTypes()) {
2980 Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
2981 << true
2982 << (isa<ClassTemplateDecl>(Template)? 0 :
2983 isa<FunctionTemplateDecl>(Template)? 1 :
2984 isa<TemplateTemplateParmDecl>(Template)? 2 : 3)
2985 << Template;
2986 Diag(Template->getLocation(), diag::note_template_decl_here)
2987 << Params->getSourceRange();
2988 return true;
2989 }
2990 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002991
Douglas Gregorf35f8282009-11-11 21:54:23 +00002992 // Check the template argument we were given.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002993 if (CheckTemplateArgument(*Param, TemplateArgs[ArgIdx], Template,
2994 TemplateLoc, RAngleLoc,
Douglas Gregor6952f1e2011-01-19 20:10:05 +00002995 ArgumentPack.size(), Converted))
Douglas Gregorf35f8282009-11-11 21:54:23 +00002996 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00002997
Douglas Gregor14be16b2010-12-20 16:57:52 +00002998 if ((*Param)->isTemplateParameterPack()) {
2999 // The template parameter was a template parameter pack, so take the
3000 // deduced argument and place it on the argument pack. Note that we
3001 // stay on the same template parameter so that we can deduce more
3002 // arguments.
3003 ArgumentPack.push_back(Converted.back());
3004 Converted.pop_back();
3005 } else {
3006 // Move to the next template parameter.
3007 ++Param;
3008 }
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003009
3010 // If this template argument is a pack expansion, record that fact
3011 // and break out; we can't actually check any more.
3012 if (TemplateArgs[ArgIdx].getArgument().isPackExpansion()) {
3013 SawPackExpansion = true;
3014 ++ArgIdx;
3015 break;
3016 }
3017
Douglas Gregor14be16b2010-12-20 16:57:52 +00003018 ++ArgIdx;
Douglas Gregorf35f8282009-11-11 21:54:23 +00003019 continue;
Douglas Gregor3e00bad2009-02-17 01:05:43 +00003020 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003021
Douglas Gregor8735b292011-06-03 02:59:40 +00003022 // If we're checking a partial template argument list, we're done.
3023 if (PartialTemplateArgs) {
3024 if ((*Param)->isTemplateParameterPack() && !ArgumentPack.empty())
3025 Converted.push_back(TemplateArgument::CreatePackCopy(Context,
3026 ArgumentPack.data(),
3027 ArgumentPack.size()));
3028
3029 return Invalid;
3030 }
3031
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003032 // If we have a template parameter pack with no more corresponding
Douglas Gregor14be16b2010-12-20 16:57:52 +00003033 // arguments, just break out now and we'll fill in the argument pack below.
3034 if ((*Param)->isTemplateParameterPack())
3035 break;
Douglas Gregorf968d832011-05-27 01:19:52 +00003036
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003037 // Check whether we have a default argument.
Douglas Gregorf35f8282009-11-11 21:54:23 +00003038 TemplateArgumentLoc Arg;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003039
Douglas Gregorf35f8282009-11-11 21:54:23 +00003040 // Retrieve the default template argument from the template
3041 // parameter. For each kind of template parameter, we substitute the
3042 // template arguments provided thus far and any "outer" template arguments
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003043 // (when the template parameter was part of a nested template) into
Douglas Gregorf35f8282009-11-11 21:54:23 +00003044 // the default argument.
3045 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*Param)) {
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003046 if (!TTP->hasDefaultArgument())
3047 return diagnoseArityMismatch(*this, Template, TemplateLoc,
3048 TemplateArgs);
Douglas Gregorf35f8282009-11-11 21:54:23 +00003049
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003050 TypeSourceInfo *ArgType = SubstDefaultTemplateArgument(*this,
Douglas Gregorf35f8282009-11-11 21:54:23 +00003051 Template,
3052 TemplateLoc,
3053 RAngleLoc,
3054 TTP,
3055 Converted);
3056 if (!ArgType)
3057 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003058
Douglas Gregorf35f8282009-11-11 21:54:23 +00003059 Arg = TemplateArgumentLoc(TemplateArgument(ArgType->getType()),
3060 ArgType);
3061 } else if (NonTypeTemplateParmDecl *NTTP
3062 = dyn_cast<NonTypeTemplateParmDecl>(*Param)) {
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003063 if (!NTTP->hasDefaultArgument())
3064 return diagnoseArityMismatch(*this, Template, TemplateLoc,
3065 TemplateArgs);
Douglas Gregorf35f8282009-11-11 21:54:23 +00003066
John McCall60d7b3a2010-08-24 06:29:42 +00003067 ExprResult E = SubstDefaultTemplateArgument(*this, Template,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003068 TemplateLoc,
3069 RAngleLoc,
3070 NTTP,
Douglas Gregorf35f8282009-11-11 21:54:23 +00003071 Converted);
3072 if (E.isInvalid())
3073 return true;
3074
3075 Expr *Ex = E.takeAs<Expr>();
3076 Arg = TemplateArgumentLoc(TemplateArgument(Ex), Ex);
3077 } else {
3078 TemplateTemplateParmDecl *TempParm
3079 = cast<TemplateTemplateParmDecl>(*Param);
3080
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003081 if (!TempParm->hasDefaultArgument())
3082 return diagnoseArityMismatch(*this, Template, TemplateLoc,
3083 TemplateArgs);
Douglas Gregorf35f8282009-11-11 21:54:23 +00003084
Douglas Gregor1d752d72011-03-02 18:46:51 +00003085 NestedNameSpecifierLoc QualifierLoc;
Douglas Gregorf35f8282009-11-11 21:54:23 +00003086 TemplateName Name = SubstDefaultTemplateArgument(*this, Template,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003087 TemplateLoc,
3088 RAngleLoc,
Douglas Gregorf35f8282009-11-11 21:54:23 +00003089 TempParm,
Douglas Gregorb6744ef2011-03-02 17:09:35 +00003090 Converted,
3091 QualifierLoc);
Douglas Gregorf35f8282009-11-11 21:54:23 +00003092 if (Name.isNull())
3093 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003094
Douglas Gregorb6744ef2011-03-02 17:09:35 +00003095 Arg = TemplateArgumentLoc(TemplateArgument(Name), QualifierLoc,
3096 TempParm->getDefaultArgument().getTemplateNameLoc());
Douglas Gregorf35f8282009-11-11 21:54:23 +00003097 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003098
Douglas Gregorf35f8282009-11-11 21:54:23 +00003099 // Introduce an instantiation record that describes where we are using
3100 // the default template argument.
3101 InstantiatingTemplate Instantiating(*this, RAngleLoc, Template, *Param,
Douglas Gregor910f8002010-11-07 23:05:16 +00003102 Converted.data(), Converted.size(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003103 SourceRange(TemplateLoc, RAngleLoc));
3104
Douglas Gregorf35f8282009-11-11 21:54:23 +00003105 // Check the default template argument.
Douglas Gregord9e15302009-11-11 19:41:09 +00003106 if (CheckTemplateArgument(*Param, Arg, Template, TemplateLoc,
Douglas Gregor6952f1e2011-01-19 20:10:05 +00003107 RAngleLoc, 0, Converted))
Douglas Gregore7526412009-11-11 19:31:23 +00003108 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003109
Douglas Gregor67714232011-03-03 02:41:12 +00003110 // Core issue 150 (assumed resolution): if this is a template template
3111 // parameter, keep track of the default template arguments from the
3112 // template definition.
3113 if (isTemplateTemplateParameter)
3114 TemplateArgs.addArgument(Arg);
3115
Douglas Gregor14be16b2010-12-20 16:57:52 +00003116 // Move to the next template parameter and argument.
3117 ++Param;
3118 ++ArgIdx;
Douglas Gregorc15cb382009-02-09 23:23:08 +00003119 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003120
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003121 // If we saw a pack expansion, then directly convert the remaining arguments,
3122 // because we don't know what parameters they'll match up with.
3123 if (SawPackExpansion) {
3124 bool AddToArgumentPack
3125 = Param != ParamEnd && (*Param)->isTemplateParameterPack();
3126 while (ArgIdx < NumArgs) {
3127 if (AddToArgumentPack)
3128 ArgumentPack.push_back(TemplateArgs[ArgIdx].getArgument());
3129 else
3130 Converted.push_back(TemplateArgs[ArgIdx].getArgument());
3131 ++ArgIdx;
3132 }
3133
3134 // Push the argument pack onto the list of converted arguments.
3135 if (AddToArgumentPack) {
3136 if (ArgumentPack.empty())
3137 Converted.push_back(TemplateArgument(0, 0));
3138 else {
3139 Converted.push_back(
3140 TemplateArgument::CreatePackCopy(Context,
3141 ArgumentPack.data(),
3142 ArgumentPack.size()));
3143 ArgumentPack.clear();
3144 }
Douglas Gregorb70126a2012-02-03 17:16:23 +00003145 } else if (ExpansionIntoFixedList) {
3146 // We have expanded a pack into a fixed list.
3147 *ExpansionIntoFixedList = true;
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003148 }
3149
3150 return Invalid;
3151 }
3152
3153 // If we have any leftover arguments, then there were too many arguments.
3154 // Complain and fail.
3155 if (ArgIdx < NumArgs)
3156 return diagnoseArityMismatch(*this, Template, TemplateLoc, TemplateArgs);
3157
3158 // If we have an expanded parameter pack, make sure we don't have too
3159 // many arguments.
3160 // FIXME: This really should fall out from the normal arity checking.
3161 if (Param != ParamEnd) {
3162 if (NonTypeTemplateParmDecl *NTTP
3163 = dyn_cast<NonTypeTemplateParmDecl>(*Param)) {
3164 if (NTTP->isExpandedParameterPack() &&
3165 ArgumentPack.size() < NTTP->getNumExpansionTypes()) {
3166 Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
3167 << false
3168 << (isa<ClassTemplateDecl>(Template)? 0 :
3169 isa<FunctionTemplateDecl>(Template)? 1 :
3170 isa<TemplateTemplateParmDecl>(Template)? 2 : 3)
3171 << Template;
3172 Diag(Template->getLocation(), diag::note_template_decl_here)
3173 << Params->getSourceRange();
3174 return true;
3175 }
3176 }
3177 }
3178
Douglas Gregor14be16b2010-12-20 16:57:52 +00003179 // Form argument packs for each of the parameter packs remaining.
3180 while (Param != ParamEnd) {
Douglas Gregord3731192011-01-10 07:32:04 +00003181 // If we're checking a partial list of template arguments, don't fill
3182 // in arguments for non-template parameter packs.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003183 if ((*Param)->isTemplateParameterPack()) {
David Blaikie1368e582011-10-19 05:19:50 +00003184 if (!HasParameterPack)
3185 return true;
Douglas Gregor8735b292011-06-03 02:59:40 +00003186 if (ArgumentPack.empty())
Douglas Gregor14be16b2010-12-20 16:57:52 +00003187 Converted.push_back(TemplateArgument(0, 0));
Douglas Gregor203e6a32011-01-11 23:09:57 +00003188 else {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003189 Converted.push_back(TemplateArgument::CreatePackCopy(Context,
3190 ArgumentPack.data(),
Douglas Gregor203e6a32011-01-11 23:09:57 +00003191 ArgumentPack.size()));
Douglas Gregor14be16b2010-12-20 16:57:52 +00003192 ArgumentPack.clear();
3193 }
Douglas Gregor8fbbae52012-02-03 07:34:46 +00003194 } else if (!PartialTemplateArgs)
3195 return diagnoseArityMismatch(*this, Template, TemplateLoc, TemplateArgs);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003196
Douglas Gregor14be16b2010-12-20 16:57:52 +00003197 ++Param;
3198 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003199
Douglas Gregorc15cb382009-02-09 23:23:08 +00003200 return Invalid;
3201}
3202
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003203namespace {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003204 class UnnamedLocalNoLinkageFinder
3205 : public TypeVisitor<UnnamedLocalNoLinkageFinder, bool>
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003206 {
3207 Sema &S;
3208 SourceRange SR;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003209
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003210 typedef TypeVisitor<UnnamedLocalNoLinkageFinder, bool> inherited;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003211
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003212 public:
3213 UnnamedLocalNoLinkageFinder(Sema &S, SourceRange SR) : S(S), SR(SR) { }
3214
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003215 bool Visit(QualType T) {
3216 return inherited::Visit(T.getTypePtr());
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003217 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003218
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003219#define TYPE(Class, Parent) \
3220 bool Visit##Class##Type(const Class##Type *);
3221#define ABSTRACT_TYPE(Class, Parent) \
3222 bool Visit##Class##Type(const Class##Type *) { return false; }
3223#define NON_CANONICAL_TYPE(Class, Parent) \
3224 bool Visit##Class##Type(const Class##Type *) { return false; }
3225#include "clang/AST/TypeNodes.def"
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003226
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003227 bool VisitTagDecl(const TagDecl *Tag);
3228 bool VisitNestedNameSpecifier(NestedNameSpecifier *NNS);
3229 };
3230}
3231
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003232bool UnnamedLocalNoLinkageFinder::VisitBuiltinType(const BuiltinType*) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003233 return false;
3234}
3235
3236bool UnnamedLocalNoLinkageFinder::VisitComplexType(const ComplexType* T) {
3237 return Visit(T->getElementType());
3238}
3239
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003240bool UnnamedLocalNoLinkageFinder::VisitPointerType(const PointerType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003241 return Visit(T->getPointeeType());
3242}
3243
3244bool UnnamedLocalNoLinkageFinder::VisitBlockPointerType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003245 const BlockPointerType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003246 return Visit(T->getPointeeType());
3247}
3248
3249bool UnnamedLocalNoLinkageFinder::VisitLValueReferenceType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003250 const LValueReferenceType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003251 return Visit(T->getPointeeType());
3252}
3253
3254bool UnnamedLocalNoLinkageFinder::VisitRValueReferenceType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003255 const RValueReferenceType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003256 return Visit(T->getPointeeType());
3257}
3258
3259bool UnnamedLocalNoLinkageFinder::VisitMemberPointerType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003260 const MemberPointerType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003261 return Visit(T->getPointeeType()) || Visit(QualType(T->getClass(), 0));
3262}
3263
3264bool UnnamedLocalNoLinkageFinder::VisitConstantArrayType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003265 const ConstantArrayType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003266 return Visit(T->getElementType());
3267}
3268
3269bool UnnamedLocalNoLinkageFinder::VisitIncompleteArrayType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003270 const IncompleteArrayType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003271 return Visit(T->getElementType());
3272}
3273
3274bool UnnamedLocalNoLinkageFinder::VisitVariableArrayType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003275 const VariableArrayType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003276 return Visit(T->getElementType());
3277}
3278
3279bool UnnamedLocalNoLinkageFinder::VisitDependentSizedArrayType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003280 const DependentSizedArrayType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003281 return Visit(T->getElementType());
3282}
3283
3284bool UnnamedLocalNoLinkageFinder::VisitDependentSizedExtVectorType(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003285 const DependentSizedExtVectorType* T) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003286 return Visit(T->getElementType());
3287}
3288
3289bool UnnamedLocalNoLinkageFinder::VisitVectorType(const VectorType* T) {
3290 return Visit(T->getElementType());
3291}
3292
3293bool UnnamedLocalNoLinkageFinder::VisitExtVectorType(const ExtVectorType* T) {
3294 return Visit(T->getElementType());
3295}
3296
3297bool UnnamedLocalNoLinkageFinder::VisitFunctionProtoType(
3298 const FunctionProtoType* T) {
3299 for (FunctionProtoType::arg_type_iterator A = T->arg_type_begin(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003300 AEnd = T->arg_type_end();
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003301 A != AEnd; ++A) {
3302 if (Visit(*A))
3303 return true;
3304 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003305
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003306 return Visit(T->getResultType());
3307}
3308
3309bool UnnamedLocalNoLinkageFinder::VisitFunctionNoProtoType(
3310 const FunctionNoProtoType* T) {
3311 return Visit(T->getResultType());
3312}
3313
3314bool UnnamedLocalNoLinkageFinder::VisitUnresolvedUsingType(
3315 const UnresolvedUsingType*) {
3316 return false;
3317}
3318
3319bool UnnamedLocalNoLinkageFinder::VisitTypeOfExprType(const TypeOfExprType*) {
3320 return false;
3321}
3322
3323bool UnnamedLocalNoLinkageFinder::VisitTypeOfType(const TypeOfType* T) {
3324 return Visit(T->getUnderlyingType());
3325}
3326
3327bool UnnamedLocalNoLinkageFinder::VisitDecltypeType(const DecltypeType*) {
3328 return false;
3329}
3330
Sean Huntca63c202011-05-24 22:41:36 +00003331bool UnnamedLocalNoLinkageFinder::VisitUnaryTransformType(
3332 const UnaryTransformType*) {
3333 return false;
3334}
3335
Richard Smith34b41d92011-02-20 03:19:35 +00003336bool UnnamedLocalNoLinkageFinder::VisitAutoType(const AutoType *T) {
3337 return Visit(T->getDeducedType());
3338}
3339
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003340bool UnnamedLocalNoLinkageFinder::VisitRecordType(const RecordType* T) {
3341 return VisitTagDecl(T->getDecl());
3342}
3343
3344bool UnnamedLocalNoLinkageFinder::VisitEnumType(const EnumType* T) {
3345 return VisitTagDecl(T->getDecl());
3346}
3347
3348bool UnnamedLocalNoLinkageFinder::VisitTemplateTypeParmType(
3349 const TemplateTypeParmType*) {
3350 return false;
3351}
3352
Douglas Gregorc3069d62011-01-14 02:55:32 +00003353bool UnnamedLocalNoLinkageFinder::VisitSubstTemplateTypeParmPackType(
3354 const SubstTemplateTypeParmPackType *) {
3355 return false;
3356}
3357
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003358bool UnnamedLocalNoLinkageFinder::VisitTemplateSpecializationType(
3359 const TemplateSpecializationType*) {
3360 return false;
3361}
3362
3363bool UnnamedLocalNoLinkageFinder::VisitInjectedClassNameType(
3364 const InjectedClassNameType* T) {
3365 return VisitTagDecl(T->getDecl());
3366}
3367
3368bool UnnamedLocalNoLinkageFinder::VisitDependentNameType(
3369 const DependentNameType* T) {
3370 return VisitNestedNameSpecifier(T->getQualifier());
3371}
3372
3373bool UnnamedLocalNoLinkageFinder::VisitDependentTemplateSpecializationType(
3374 const DependentTemplateSpecializationType* T) {
3375 return VisitNestedNameSpecifier(T->getQualifier());
3376}
3377
Douglas Gregor7536dd52010-12-20 02:24:11 +00003378bool UnnamedLocalNoLinkageFinder::VisitPackExpansionType(
3379 const PackExpansionType* T) {
3380 return Visit(T->getPattern());
3381}
3382
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003383bool UnnamedLocalNoLinkageFinder::VisitObjCObjectType(const ObjCObjectType *) {
3384 return false;
3385}
3386
3387bool UnnamedLocalNoLinkageFinder::VisitObjCInterfaceType(
3388 const ObjCInterfaceType *) {
3389 return false;
3390}
3391
3392bool UnnamedLocalNoLinkageFinder::VisitObjCObjectPointerType(
3393 const ObjCObjectPointerType *) {
3394 return false;
3395}
3396
Eli Friedmanb001de72011-10-06 23:00:33 +00003397bool UnnamedLocalNoLinkageFinder::VisitAtomicType(const AtomicType* T) {
3398 return Visit(T->getValueType());
3399}
3400
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003401bool UnnamedLocalNoLinkageFinder::VisitTagDecl(const TagDecl *Tag) {
3402 if (Tag->getDeclContext()->isFunctionOrMethod()) {
Richard Smithebaf0e62011-10-18 20:49:44 +00003403 S.Diag(SR.getBegin(),
David Blaikie4e4d0842012-03-11 07:00:24 +00003404 S.getLangOpts().CPlusPlus0x ?
Richard Smithebaf0e62011-10-18 20:49:44 +00003405 diag::warn_cxx98_compat_template_arg_local_type :
3406 diag::ext_template_arg_local_type)
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003407 << S.Context.getTypeDeclType(Tag) << SR;
3408 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003409 }
3410
Richard Smith162e1c12011-04-15 14:24:37 +00003411 if (!Tag->getDeclName() && !Tag->getTypedefNameForAnonDecl()) {
Richard Smithebaf0e62011-10-18 20:49:44 +00003412 S.Diag(SR.getBegin(),
David Blaikie4e4d0842012-03-11 07:00:24 +00003413 S.getLangOpts().CPlusPlus0x ?
Richard Smithebaf0e62011-10-18 20:49:44 +00003414 diag::warn_cxx98_compat_template_arg_unnamed_type :
3415 diag::ext_template_arg_unnamed_type) << SR;
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003416 S.Diag(Tag->getLocation(), diag::note_template_unnamed_type_here);
3417 return true;
3418 }
3419
3420 return false;
3421}
3422
3423bool UnnamedLocalNoLinkageFinder::VisitNestedNameSpecifier(
3424 NestedNameSpecifier *NNS) {
3425 if (NNS->getPrefix() && VisitNestedNameSpecifier(NNS->getPrefix()))
3426 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003427
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003428 switch (NNS->getKind()) {
3429 case NestedNameSpecifier::Identifier:
3430 case NestedNameSpecifier::Namespace:
Douglas Gregor14aba762011-02-24 02:36:08 +00003431 case NestedNameSpecifier::NamespaceAlias:
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003432 case NestedNameSpecifier::Global:
3433 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003434
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003435 case NestedNameSpecifier::TypeSpec:
3436 case NestedNameSpecifier::TypeSpecWithTemplate:
3437 return Visit(QualType(NNS->getAsType(), 0));
3438 }
David Blaikie7530c032012-01-17 06:56:22 +00003439 llvm_unreachable("Invalid NestedNameSpecifier::Kind!");
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003440}
3441
3442
Douglas Gregorc15cb382009-02-09 23:23:08 +00003443/// \brief Check a template argument against its corresponding
3444/// template type parameter.
3445///
3446/// This routine implements the semantics of C++ [temp.arg.type]. It
3447/// returns true if an error occurred, and false otherwise.
Mike Stump1eb44332009-09-09 15:08:12 +00003448bool Sema::CheckTemplateArgument(TemplateTypeParmDecl *Param,
John McCalla93c9342009-12-07 02:54:59 +00003449 TypeSourceInfo *ArgInfo) {
3450 assert(ArgInfo && "invalid TypeSourceInfo");
John McCall833ca992009-10-29 08:12:44 +00003451 QualType Arg = ArgInfo->getType();
Douglas Gregor0fddb972010-05-22 16:17:30 +00003452 SourceRange SR = ArgInfo->getTypeLoc().getSourceRange();
Chandler Carruth17fb8552010-09-03 21:12:34 +00003453
3454 if (Arg->isVariablyModifiedType()) {
3455 return Diag(SR.getBegin(), diag::err_variably_modified_template_arg) << Arg;
Douglas Gregor4b52e252009-12-21 23:17:24 +00003456 } else if (Context.hasSameUnqualifiedType(Arg, Context.OverloadTy)) {
Douglas Gregor4b52e252009-12-21 23:17:24 +00003457 return Diag(SR.getBegin(), diag::err_template_arg_overload_type) << SR;
Douglas Gregorc15cb382009-02-09 23:23:08 +00003458 }
3459
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003460 // C++03 [temp.arg.type]p2:
3461 // A local type, a type with no linkage, an unnamed type or a type
3462 // compounded from any of these types shall not be used as a
3463 // template-argument for a template type-parameter.
3464 //
Richard Smithebaf0e62011-10-18 20:49:44 +00003465 // C++11 allows these, and even in C++03 we allow them as an extension with
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003466 // a warning.
Richard Smithebaf0e62011-10-18 20:49:44 +00003467 if (LangOpts.CPlusPlus0x ?
3468 Diags.getDiagnosticLevel(diag::warn_cxx98_compat_template_arg_unnamed_type,
3469 SR.getBegin()) != DiagnosticsEngine::Ignored ||
3470 Diags.getDiagnosticLevel(diag::warn_cxx98_compat_template_arg_local_type,
3471 SR.getBegin()) != DiagnosticsEngine::Ignored :
3472 Arg->hasUnnamedOrLocalType()) {
Douglas Gregor5f3aeb62010-10-13 00:27:52 +00003473 UnnamedLocalNoLinkageFinder Finder(*this, SR);
3474 (void)Finder.Visit(Context.getCanonicalType(Arg));
3475 }
3476
Douglas Gregorc15cb382009-02-09 23:23:08 +00003477 return false;
3478}
3479
Douglas Gregor42963612012-04-10 17:08:25 +00003480enum NullPointerValueKind {
3481 NPV_NotNullPointer,
3482 NPV_NullPointer,
3483 NPV_Error
3484};
3485
3486/// \brief Determine whether the given template argument is a null pointer
3487/// value of the appropriate type.
3488static NullPointerValueKind
3489isNullPointerValueTemplateArgument(Sema &S, NonTypeTemplateParmDecl *Param,
3490 QualType ParamType, Expr *Arg) {
3491 if (Arg->isValueDependent() || Arg->isTypeDependent())
3492 return NPV_NotNullPointer;
3493
3494 if (!S.getLangOpts().CPlusPlus0x)
3495 return NPV_NotNullPointer;
3496
3497 // Determine whether we have a constant expression.
Douglas Gregor50fadd12012-04-10 19:03:30 +00003498 ExprResult ArgRV = S.DefaultFunctionArrayConversion(Arg);
3499 if (ArgRV.isInvalid())
3500 return NPV_Error;
3501 Arg = ArgRV.take();
3502
Douglas Gregor42963612012-04-10 17:08:25 +00003503 Expr::EvalResult EvalResult;
Douglas Gregor50fadd12012-04-10 19:03:30 +00003504 llvm::SmallVector<PartialDiagnosticAt, 8> Notes;
3505 EvalResult.Diag = &Notes;
Douglas Gregor42963612012-04-10 17:08:25 +00003506 if (!Arg->EvaluateAsRValue(EvalResult, S.Context) ||
Douglas Gregor50fadd12012-04-10 19:03:30 +00003507 EvalResult.HasSideEffects) {
3508 SourceLocation DiagLoc = Arg->getExprLoc();
3509
3510 // If our only note is the usual "invalid subexpression" note, just point
3511 // the caret at its location rather than producing an essentially
3512 // redundant note.
3513 if (Notes.size() == 1 && Notes[0].second.getDiagID() ==
3514 diag::note_invalid_subexpr_in_const_expr) {
3515 DiagLoc = Notes[0].first;
3516 Notes.clear();
3517 }
3518
3519 S.Diag(DiagLoc, diag::err_template_arg_not_address_constant)
3520 << Arg->getType() << Arg->getSourceRange();
3521 for (unsigned I = 0, N = Notes.size(); I != N; ++I)
3522 S.Diag(Notes[I].first, Notes[I].second);
3523
3524 S.Diag(Param->getLocation(), diag::note_template_param_here);
3525 return NPV_Error;
3526 }
Douglas Gregor42963612012-04-10 17:08:25 +00003527
3528 // C++11 [temp.arg.nontype]p1:
3529 // - an address constant expression of type std::nullptr_t
3530 if (Arg->getType()->isNullPtrType())
3531 return NPV_NullPointer;
3532
3533 // - a constant expression that evaluates to a null pointer value (4.10); or
3534 // - a constant expression that evaluates to a null member pointer value
3535 // (4.11); or
3536 if ((EvalResult.Val.isLValue() && !EvalResult.Val.getLValueBase()) ||
3537 (EvalResult.Val.isMemberPointer() &&
3538 !EvalResult.Val.getMemberPointerDecl())) {
3539 // If our expression has an appropriate type, we've succeeded.
3540 bool ObjCLifetimeConversion;
3541 if (S.Context.hasSameUnqualifiedType(Arg->getType(), ParamType) ||
3542 S.IsQualificationConversion(Arg->getType(), ParamType, false,
3543 ObjCLifetimeConversion))
3544 return NPV_NullPointer;
3545
3546 // The types didn't match, but we know we got a null pointer; complain,
3547 // then recover as if the types were correct.
3548 S.Diag(Arg->getExprLoc(), diag::err_template_arg_wrongtype_null_constant)
3549 << Arg->getType() << ParamType << Arg->getSourceRange();
3550 S.Diag(Param->getLocation(), diag::note_template_param_here);
3551 return NPV_NullPointer;
3552 }
3553
3554 // If we don't have a null pointer value, but we do have a NULL pointer
3555 // constant, suggest a cast to the appropriate type.
3556 if (Arg->isNullPointerConstant(S.Context, Expr::NPC_NeverValueDependent)) {
3557 std::string Code = "static_cast<" + ParamType.getAsString() + ">(";
3558 S.Diag(Arg->getExprLoc(), diag::err_template_arg_untyped_null_constant)
3559 << ParamType
3560 << FixItHint::CreateInsertion(Arg->getLocStart(), Code)
3561 << FixItHint::CreateInsertion(S.PP.getLocForEndOfToken(Arg->getLocEnd()),
3562 ")");
3563 S.Diag(Param->getLocation(), diag::note_template_param_here);
3564 return NPV_NullPointer;
3565 }
3566
3567 // FIXME: If we ever want to support general, address-constant expressions
3568 // as non-type template arguments, we should return the ExprResult here to
3569 // be interpreted by the caller.
3570 return NPV_NotNullPointer;
3571}
3572
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003573/// \brief Checks whether the given template argument is the address
3574/// of an object or function according to C++ [temp.arg.nontype]p1.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003575static bool
Douglas Gregorb7a09262010-04-01 18:32:35 +00003576CheckTemplateArgumentAddressOfObjectOrFunction(Sema &S,
3577 NonTypeTemplateParmDecl *Param,
3578 QualType ParamType,
3579 Expr *ArgIn,
3580 TemplateArgument &Converted) {
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003581 bool Invalid = false;
Douglas Gregorb7a09262010-04-01 18:32:35 +00003582 Expr *Arg = ArgIn;
3583 QualType ArgType = Arg->getType();
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003584
Douglas Gregor42963612012-04-10 17:08:25 +00003585 // If our parameter has pointer type, check for a null template value.
3586 if (ParamType->isPointerType() || ParamType->isNullPtrType()) {
3587 switch (isNullPointerValueTemplateArgument(S, Param, ParamType, Arg)) {
3588 case NPV_NullPointer:
3589 Converted = TemplateArgument((Decl *)0);
3590 return false;
3591
3592 case NPV_Error:
3593 return true;
3594
3595 case NPV_NotNullPointer:
3596 break;
3597 }
3598 }
3599
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003600 // See through any implicit casts we added to fix the type.
John McCall91a57552011-07-15 05:09:51 +00003601 Arg = Arg->IgnoreImpCasts();
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003602
3603 // C++ [temp.arg.nontype]p1:
Mike Stump1eb44332009-09-09 15:08:12 +00003604 //
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003605 // A template-argument for a non-type, non-template
3606 // template-parameter shall be one of: [...]
3607 //
3608 // -- the address of an object or function with external
3609 // linkage, including function templates and function
3610 // template-ids but excluding non-static class members,
3611 // expressed as & id-expression where the & is optional if
3612 // the name refers to a function or array, or if the
3613 // corresponding template-parameter is a reference; or
Mike Stump1eb44332009-09-09 15:08:12 +00003614
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00003615 // In C++98/03 mode, give an extension warning on any extra parentheses.
3616 // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773
3617 bool ExtraParens = false;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003618 while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) {
Richard Smithebaf0e62011-10-18 20:49:44 +00003619 if (!Invalid && !ExtraParens) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00003620 S.Diag(Arg->getLocStart(),
David Blaikie4e4d0842012-03-11 07:00:24 +00003621 S.getLangOpts().CPlusPlus0x ?
Richard Smithebaf0e62011-10-18 20:49:44 +00003622 diag::warn_cxx98_compat_template_arg_extra_parens :
3623 diag::ext_template_arg_extra_parens)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003624 << Arg->getSourceRange();
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00003625 ExtraParens = true;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003626 }
3627
3628 Arg = Parens->getSubExpr();
3629 }
3630
John McCall91a57552011-07-15 05:09:51 +00003631 while (SubstNonTypeTemplateParmExpr *subst =
3632 dyn_cast<SubstNonTypeTemplateParmExpr>(Arg))
3633 Arg = subst->getReplacement()->IgnoreImpCasts();
3634
Douglas Gregorb7a09262010-04-01 18:32:35 +00003635 bool AddressTaken = false;
3636 SourceLocation AddrOpLoc;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003637 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
John McCall2de56d12010-08-25 11:45:40 +00003638 if (UnOp->getOpcode() == UO_AddrOf) {
John McCall91a57552011-07-15 05:09:51 +00003639 Arg = UnOp->getSubExpr();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003640 AddressTaken = true;
3641 AddrOpLoc = UnOp->getOperatorLoc();
3642 }
Francois Picheta343a412011-04-29 09:08:14 +00003643 }
John McCall91a57552011-07-15 05:09:51 +00003644
David Blaikie4e4d0842012-03-11 07:00:24 +00003645 if (S.getLangOpts().MicrosoftExt && isa<CXXUuidofExpr>(Arg)) {
John McCall91a57552011-07-15 05:09:51 +00003646 Converted = TemplateArgument(ArgIn);
3647 return false;
3648 }
3649
3650 while (SubstNonTypeTemplateParmExpr *subst =
3651 dyn_cast<SubstNonTypeTemplateParmExpr>(Arg))
3652 Arg = subst->getReplacement()->IgnoreImpCasts();
3653
Chandler Carruth038cc392010-01-31 10:01:20 +00003654 // Stop checking the precise nature of the argument if it is value dependent,
3655 // it should be checked when instantiated.
Douglas Gregorb7a09262010-04-01 18:32:35 +00003656 if (Arg->isValueDependent()) {
John McCall3fa5cae2010-10-26 07:05:15 +00003657 Converted = TemplateArgument(ArgIn);
Chandler Carruth038cc392010-01-31 10:01:20 +00003658 return false;
Douglas Gregorb7a09262010-04-01 18:32:35 +00003659 }
Douglas Gregord2008e22012-04-06 22:40:38 +00003660
3661 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg);
3662 if (!DRE) {
3663 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_decl_ref)
3664 << Arg->getSourceRange();
3665 S.Diag(Param->getLocation(), diag::note_template_param_here);
3666 return true;
3667 }
Chandler Carruth038cc392010-01-31 10:01:20 +00003668
Douglas Gregorb7a09262010-04-01 18:32:35 +00003669 if (!isa<ValueDecl>(DRE->getDecl())) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00003670 S.Diag(Arg->getLocStart(),
Douglas Gregorb7a09262010-04-01 18:32:35 +00003671 diag::err_template_arg_not_object_or_func_form)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003672 << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003673 S.Diag(Param->getLocation(), diag::note_template_param_here);
3674 return true;
3675 }
3676
Richard Smithb4051e72012-04-04 21:11:30 +00003677 NamedDecl *Entity = DRE->getDecl();
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003678
3679 // Cannot refer to non-static data members
Richard Smithb4051e72012-04-04 21:11:30 +00003680 if (FieldDecl *Field = dyn_cast<FieldDecl>(Entity)) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00003681 S.Diag(Arg->getLocStart(), diag::err_template_arg_field)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003682 << Field << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003683 S.Diag(Param->getLocation(), diag::note_template_param_here);
3684 return true;
3685 }
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003686
3687 // Cannot refer to non-static member functions
Richard Smithb4051e72012-04-04 21:11:30 +00003688 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Entity)) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00003689 if (!Method->isStatic()) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00003690 S.Diag(Arg->getLocStart(), diag::err_template_arg_method)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003691 << Method << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003692 S.Diag(Param->getLocation(), diag::note_template_param_here);
3693 return true;
3694 }
Richard Smithb4051e72012-04-04 21:11:30 +00003695 }
Mike Stump1eb44332009-09-09 15:08:12 +00003696
Richard Smithb4051e72012-04-04 21:11:30 +00003697 FunctionDecl *Func = dyn_cast<FunctionDecl>(Entity);
3698 VarDecl *Var = dyn_cast<VarDecl>(Entity);
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003699
Richard Smithb4051e72012-04-04 21:11:30 +00003700 // A non-type template argument must refer to an object or function.
3701 if (!Func && !Var) {
3702 // We found something, but we don't know specifically what it is.
3703 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_object_or_func)
3704 << Arg->getSourceRange();
3705 S.Diag(DRE->getDecl()->getLocation(), diag::note_template_arg_refers_here);
3706 return true;
3707 }
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003708
Richard Smithb4051e72012-04-04 21:11:30 +00003709 // Address / reference template args must have external linkage in C++98.
3710 if (Entity->getLinkage() == InternalLinkage) {
3711 S.Diag(Arg->getLocStart(), S.getLangOpts().CPlusPlus0x ?
3712 diag::warn_cxx98_compat_template_arg_object_internal :
3713 diag::ext_template_arg_object_internal)
3714 << !Func << Entity << Arg->getSourceRange();
3715 S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object)
3716 << !Func;
3717 } else if (Entity->getLinkage() == NoLinkage) {
3718 S.Diag(Arg->getLocStart(), diag::err_template_arg_object_no_linkage)
3719 << !Func << Entity << Arg->getSourceRange();
3720 S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object)
3721 << !Func;
3722 return true;
3723 }
3724
3725 if (Func) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00003726 // If the template parameter has pointer type, the function decays.
3727 if (ParamType->isPointerType() && !AddressTaken)
3728 ArgType = S.Context.getPointerType(Func->getType());
3729 else if (AddressTaken && ParamType->isReferenceType()) {
3730 // If we originally had an address-of operator, but the
3731 // parameter has reference type, complain and (if things look
3732 // like they will work) drop the address-of operator.
3733 if (!S.Context.hasSameUnqualifiedType(Func->getType(),
3734 ParamType.getNonReferenceType())) {
3735 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
3736 << ParamType;
3737 S.Diag(Param->getLocation(), diag::note_template_param_here);
3738 return true;
3739 }
3740
3741 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
3742 << ParamType
3743 << FixItHint::CreateRemoval(AddrOpLoc);
3744 S.Diag(Param->getLocation(), diag::note_template_param_here);
3745
3746 ArgType = Func->getType();
3747 }
Richard Smithb4051e72012-04-04 21:11:30 +00003748 } else {
Douglas Gregorb7a09262010-04-01 18:32:35 +00003749 // A value of reference type is not an object.
3750 if (Var->getType()->isReferenceType()) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00003751 S.Diag(Arg->getLocStart(),
Douglas Gregorb7a09262010-04-01 18:32:35 +00003752 diag::err_template_arg_reference_var)
3753 << Var->getType() << Arg->getSourceRange();
3754 S.Diag(Param->getLocation(), diag::note_template_param_here);
3755 return true;
3756 }
3757
Richard Smithb4051e72012-04-04 21:11:30 +00003758 // A template argument must have static storage duration.
3759 // FIXME: Ensure this works for thread_local as well as __thread.
3760 if (Var->isThreadSpecified()) {
3761 S.Diag(Arg->getLocStart(), diag::err_template_arg_thread_local)
3762 << Arg->getSourceRange();
3763 S.Diag(Var->getLocation(), diag::note_template_arg_refers_here);
3764 return true;
3765 }
Douglas Gregorb7a09262010-04-01 18:32:35 +00003766
3767 // If the template parameter has pointer type, we must have taken
3768 // the address of this object.
3769 if (ParamType->isReferenceType()) {
3770 if (AddressTaken) {
3771 // If we originally had an address-of operator, but the
3772 // parameter has reference type, complain and (if things look
3773 // like they will work) drop the address-of operator.
3774 if (!S.Context.hasSameUnqualifiedType(Var->getType(),
3775 ParamType.getNonReferenceType())) {
3776 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
3777 << ParamType;
3778 S.Diag(Param->getLocation(), diag::note_template_param_here);
3779 return true;
3780 }
3781
3782 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
3783 << ParamType
3784 << FixItHint::CreateRemoval(AddrOpLoc);
3785 S.Diag(Param->getLocation(), diag::note_template_param_here);
3786
3787 ArgType = Var->getType();
3788 }
3789 } else if (!AddressTaken && ParamType->isPointerType()) {
3790 if (Var->getType()->isArrayType()) {
3791 // Array-to-pointer decay.
3792 ArgType = S.Context.getArrayDecayedType(Var->getType());
3793 } else {
3794 // If the template parameter has pointer type but the address of
3795 // this object was not taken, complain and (possibly) recover by
3796 // taking the address of the entity.
3797 ArgType = S.Context.getPointerType(Var->getType());
3798 if (!S.Context.hasSameUnqualifiedType(ArgType, ParamType)) {
3799 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_address_of)
3800 << ParamType;
3801 S.Diag(Param->getLocation(), diag::note_template_param_here);
3802 return true;
3803 }
3804
3805 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_address_of)
3806 << ParamType
3807 << FixItHint::CreateInsertion(Arg->getLocStart(), "&");
3808
3809 S.Diag(Param->getLocation(), diag::note_template_param_here);
3810 }
3811 }
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003812 }
Mike Stump1eb44332009-09-09 15:08:12 +00003813
John McCallf85e1932011-06-15 23:02:42 +00003814 bool ObjCLifetimeConversion;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003815 if (ParamType->isPointerType() &&
Douglas Gregorb7a09262010-04-01 18:32:35 +00003816 !ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType() &&
John McCallf85e1932011-06-15 23:02:42 +00003817 S.IsQualificationConversion(ArgType, ParamType, false,
3818 ObjCLifetimeConversion)) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00003819 // For pointer-to-object types, qualification conversions are
3820 // permitted.
3821 } else {
3822 if (const ReferenceType *ParamRef = ParamType->getAs<ReferenceType>()) {
3823 if (!ParamRef->getPointeeType()->isFunctionType()) {
3824 // C++ [temp.arg.nontype]p5b3:
3825 // For a non-type template-parameter of type reference to
3826 // object, no conversions apply. The type referred to by the
3827 // reference may be more cv-qualified than the (otherwise
3828 // identical) type of the template- argument. The
3829 // template-parameter is bound directly to the
3830 // template-argument, which shall be an lvalue.
3831
3832 // FIXME: Other qualifiers?
3833 unsigned ParamQuals = ParamRef->getPointeeType().getCVRQualifiers();
3834 unsigned ArgQuals = ArgType.getCVRQualifiers();
3835
3836 if ((ParamQuals | ArgQuals) != ParamQuals) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00003837 S.Diag(Arg->getLocStart(),
Douglas Gregorb7a09262010-04-01 18:32:35 +00003838 diag::err_template_arg_ref_bind_ignores_quals)
3839 << ParamType << Arg->getType()
3840 << Arg->getSourceRange();
3841 S.Diag(Param->getLocation(), diag::note_template_param_here);
3842 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003843 }
Douglas Gregorb7a09262010-04-01 18:32:35 +00003844 }
3845 }
3846
3847 // At this point, the template argument refers to an object or
3848 // function with external linkage. We now need to check whether the
3849 // argument and parameter types are compatible.
3850 if (!S.Context.hasSameUnqualifiedType(ArgType,
3851 ParamType.getNonReferenceType())) {
3852 // We can't perform this conversion or binding.
3853 if (ParamType->isReferenceType())
3854 S.Diag(Arg->getLocStart(), diag::err_template_arg_no_ref_bind)
John McCall91a57552011-07-15 05:09:51 +00003855 << ParamType << ArgIn->getType() << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003856 else
3857 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_convertible)
John McCall91a57552011-07-15 05:09:51 +00003858 << ArgIn->getType() << ParamType << Arg->getSourceRange();
Douglas Gregorb7a09262010-04-01 18:32:35 +00003859 S.Diag(Param->getLocation(), diag::note_template_param_here);
3860 return true;
3861 }
3862 }
3863
3864 // Create the template argument.
3865 Converted = TemplateArgument(Entity->getCanonicalDecl());
Eli Friedman5f2987c2012-02-02 03:46:19 +00003866 S.MarkAnyDeclReferenced(Arg->getLocStart(), Entity);
Douglas Gregorb7a09262010-04-01 18:32:35 +00003867 return false;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003868}
3869
3870/// \brief Checks whether the given template argument is a pointer to
3871/// member constant according to C++ [temp.arg.nontype]p1.
Douglas Gregor42963612012-04-10 17:08:25 +00003872static bool CheckTemplateArgumentPointerToMember(Sema &S,
3873 NonTypeTemplateParmDecl *Param,
3874 QualType ParamType,
3875 Expr *&ResultArg,
3876 TemplateArgument &Converted) {
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003877 bool Invalid = false;
3878
Douglas Gregor42963612012-04-10 17:08:25 +00003879 // Check for a null pointer value.
3880 Expr *Arg = ResultArg;
3881 switch (isNullPointerValueTemplateArgument(S, Param, ParamType, Arg)) {
3882 case NPV_Error:
3883 return true;
3884 case NPV_NullPointer:
3885 Converted = TemplateArgument((Decl *)0);
3886 return false;
3887 case NPV_NotNullPointer:
3888 break;
3889 }
3890
3891 bool ObjCLifetimeConversion;
3892 if (S.IsQualificationConversion(Arg->getType(),
3893 ParamType.getNonReferenceType(),
3894 false, ObjCLifetimeConversion)) {
3895 Arg = S.ImpCastExprToType(Arg, ParamType, CK_NoOp,
3896 Arg->getValueKind()).take();
3897 ResultArg = Arg;
3898 } else if (!S.Context.hasSameUnqualifiedType(Arg->getType(),
3899 ParamType.getNonReferenceType())) {
3900 // We can't perform this conversion.
3901 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_convertible)
3902 << Arg->getType() << ParamType << Arg->getSourceRange();
3903 S.Diag(Param->getLocation(), diag::note_template_param_here);
3904 return true;
3905 }
3906
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003907 // See through any implicit casts we added to fix the type.
Eli Friedman73c39ab2009-10-20 08:27:19 +00003908 while (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg))
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003909 Arg = Cast->getSubExpr();
3910
3911 // C++ [temp.arg.nontype]p1:
Mike Stump1eb44332009-09-09 15:08:12 +00003912 //
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003913 // A template-argument for a non-type, non-template
3914 // template-parameter shall be one of: [...]
3915 //
3916 // -- a pointer to member expressed as described in 5.3.1.
Douglas Gregora2813ce2009-10-23 18:54:35 +00003917 DeclRefExpr *DRE = 0;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003918
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00003919 // In C++98/03 mode, give an extension warning on any extra parentheses.
3920 // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773
3921 bool ExtraParens = false;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003922 while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) {
Richard Smithebaf0e62011-10-18 20:49:44 +00003923 if (!Invalid && !ExtraParens) {
Douglas Gregor42963612012-04-10 17:08:25 +00003924 S.Diag(Arg->getLocStart(),
3925 S.getLangOpts().CPlusPlus0x ?
3926 diag::warn_cxx98_compat_template_arg_extra_parens :
3927 diag::ext_template_arg_extra_parens)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003928 << Arg->getSourceRange();
Abramo Bagnara2c5399f2010-09-13 06:06:58 +00003929 ExtraParens = true;
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003930 }
3931
3932 Arg = Parens->getSubExpr();
3933 }
3934
John McCall91a57552011-07-15 05:09:51 +00003935 while (SubstNonTypeTemplateParmExpr *subst =
3936 dyn_cast<SubstNonTypeTemplateParmExpr>(Arg))
3937 Arg = subst->getReplacement()->IgnoreImpCasts();
3938
Douglas Gregorcaddba02009-11-12 18:38:13 +00003939 // A pointer-to-member constant written &Class::member.
3940 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
John McCall2de56d12010-08-25 11:45:40 +00003941 if (UnOp->getOpcode() == UO_AddrOf) {
Douglas Gregora2813ce2009-10-23 18:54:35 +00003942 DRE = dyn_cast<DeclRefExpr>(UnOp->getSubExpr());
3943 if (DRE && !DRE->getQualifier())
3944 DRE = 0;
3945 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003946 }
Douglas Gregorcaddba02009-11-12 18:38:13 +00003947 // A constant of pointer-to-member type.
3948 else if ((DRE = dyn_cast<DeclRefExpr>(Arg))) {
3949 if (ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) {
3950 if (VD->getType()->isMemberPointerType()) {
3951 if (isa<NonTypeTemplateParmDecl>(VD) ||
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003952 (isa<VarDecl>(VD) &&
Douglas Gregor42963612012-04-10 17:08:25 +00003953 S.Context.getCanonicalType(VD->getType()).isConstQualified())) {
Douglas Gregorcaddba02009-11-12 18:38:13 +00003954 if (Arg->isTypeDependent() || Arg->isValueDependent())
John McCall3fa5cae2010-10-26 07:05:15 +00003955 Converted = TemplateArgument(Arg);
Douglas Gregorcaddba02009-11-12 18:38:13 +00003956 else
3957 Converted = TemplateArgument(VD->getCanonicalDecl());
3958 return Invalid;
3959 }
3960 }
3961 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003962
Douglas Gregorcaddba02009-11-12 18:38:13 +00003963 DRE = 0;
3964 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00003965
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003966 if (!DRE)
Douglas Gregor42963612012-04-10 17:08:25 +00003967 return S.Diag(Arg->getLocStart(),
3968 diag::err_template_arg_not_pointer_to_member_form)
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003969 << Arg->getSourceRange();
3970
3971 if (isa<FieldDecl>(DRE->getDecl()) || isa<CXXMethodDecl>(DRE->getDecl())) {
3972 assert((isa<FieldDecl>(DRE->getDecl()) ||
3973 !cast<CXXMethodDecl>(DRE->getDecl())->isStatic()) &&
3974 "Only non-static member pointers can make it here");
3975
3976 // Okay: this is the address of a non-static member, and therefore
3977 // a member pointer constant.
Douglas Gregorcaddba02009-11-12 18:38:13 +00003978 if (Arg->isTypeDependent() || Arg->isValueDependent())
John McCall3fa5cae2010-10-26 07:05:15 +00003979 Converted = TemplateArgument(Arg);
Douglas Gregorcaddba02009-11-12 18:38:13 +00003980 else
3981 Converted = TemplateArgument(DRE->getDecl()->getCanonicalDecl());
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003982 return Invalid;
3983 }
3984
3985 // We found something else, but we don't know specifically what it is.
Douglas Gregor42963612012-04-10 17:08:25 +00003986 S.Diag(Arg->getLocStart(),
3987 diag::err_template_arg_not_pointer_to_member_form)
3988 << Arg->getSourceRange();
3989 S.Diag(DRE->getDecl()->getLocation(), diag::note_template_arg_refers_here);
Douglas Gregorcc45cb32009-02-11 19:52:55 +00003990 return true;
3991}
3992
Douglas Gregorc15cb382009-02-09 23:23:08 +00003993/// \brief Check a template argument against its corresponding
3994/// non-type template parameter.
3995///
Douglas Gregor2943aed2009-03-03 04:44:36 +00003996/// This routine implements the semantics of C++ [temp.arg.nontype].
John Wiegley429bb272011-04-08 18:41:53 +00003997/// If an error occurred, it returns ExprError(); otherwise, it
3998/// returns the converted template argument. \p
Douglas Gregor2943aed2009-03-03 04:44:36 +00003999/// InstantiatedParamType is the type of the non-type template
4000/// parameter after it has been instantiated.
John Wiegley429bb272011-04-08 18:41:53 +00004001ExprResult Sema::CheckTemplateArgument(NonTypeTemplateParmDecl *Param,
4002 QualType InstantiatedParamType, Expr *Arg,
4003 TemplateArgument &Converted,
4004 CheckTemplateArgumentKind CTAK) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004005 SourceLocation StartLoc = Arg->getLocStart();
Douglas Gregor40808ce2009-03-09 23:48:35 +00004006
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004007 // If either the parameter has a dependent type or the argument is
4008 // type-dependent, there's nothing we can check now.
Douglas Gregor40808ce2009-03-09 23:48:35 +00004009 if (InstantiatedParamType->isDependentType() || Arg->isTypeDependent()) {
4010 // FIXME: Produce a cloned, canonical expression?
Douglas Gregor02cbbd22009-06-11 18:10:32 +00004011 Converted = TemplateArgument(Arg);
John Wiegley429bb272011-04-08 18:41:53 +00004012 return Owned(Arg);
Douglas Gregor40808ce2009-03-09 23:48:35 +00004013 }
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004014
4015 // C++ [temp.arg.nontype]p5:
4016 // The following conversions are performed on each expression used
4017 // as a non-type template-argument. If a non-type
4018 // template-argument cannot be converted to the type of the
4019 // corresponding template-parameter then the program is
4020 // ill-formed.
Douglas Gregor2943aed2009-03-03 04:44:36 +00004021 QualType ParamType = InstantiatedParamType;
Douglas Gregor2ade35e2010-06-16 00:17:44 +00004022 if (ParamType->isIntegralOrEnumerationType()) {
Richard Smith8ef7b202012-01-18 23:55:52 +00004023 // C++11:
4024 // -- for a non-type template-parameter of integral or
4025 // enumeration type, conversions permitted in a converted
4026 // constant expression are applied.
4027 //
4028 // C++98:
4029 // -- for a non-type template-parameter of integral or
4030 // enumeration type, integral promotions (4.5) and integral
4031 // conversions (4.7) are applied.
4032
4033 if (CTAK == CTAK_Deduced &&
4034 !Context.hasSameUnqualifiedType(ParamType, Arg->getType())) {
4035 // C++ [temp.deduct.type]p17:
4036 // If, in the declaration of a function template with a non-type
4037 // template-parameter, the non-type template-parameter is used
4038 // in an expression in the function parameter-list and, if the
4039 // corresponding template-argument is deduced, the
4040 // template-argument type shall match the type of the
4041 // template-parameter exactly, except that a template-argument
4042 // deduced from an array bound may be of any integral type.
4043 Diag(StartLoc, diag::err_deduced_non_type_template_arg_type_mismatch)
4044 << Arg->getType().getUnqualifiedType()
4045 << ParamType.getUnqualifiedType();
4046 Diag(Param->getLocation(), diag::note_template_param_here);
4047 return ExprError();
4048 }
4049
David Blaikie4e4d0842012-03-11 07:00:24 +00004050 if (getLangOpts().CPlusPlus0x) {
Richard Smith8ef7b202012-01-18 23:55:52 +00004051 // We can't check arbitrary value-dependent arguments.
4052 // FIXME: If there's no viable conversion to the template parameter type,
4053 // we should be able to diagnose that prior to instantiation.
4054 if (Arg->isValueDependent()) {
4055 Converted = TemplateArgument(Arg);
4056 return Owned(Arg);
4057 }
4058
4059 // C++ [temp.arg.nontype]p1:
4060 // A template-argument for a non-type, non-template template-parameter
4061 // shall be one of:
4062 //
4063 // -- for a non-type template-parameter of integral or enumeration
4064 // type, a converted constant expression of the type of the
4065 // template-parameter; or
4066 llvm::APSInt Value;
4067 ExprResult ArgResult =
4068 CheckConvertedConstantExpression(Arg, ParamType, Value,
4069 CCEK_TemplateArg);
4070 if (ArgResult.isInvalid())
4071 return ExprError();
4072
4073 // Widen the argument value to sizeof(parameter type). This is almost
4074 // always a no-op, except when the parameter type is bool. In
4075 // that case, this may extend the argument from 1 bit to 8 bits.
4076 QualType IntegerType = ParamType;
4077 if (const EnumType *Enum = IntegerType->getAs<EnumType>())
4078 IntegerType = Enum->getDecl()->getIntegerType();
4079 Value = Value.extOrTrunc(Context.getTypeSize(IntegerType));
4080
4081 Converted = TemplateArgument(Value, Context.getCanonicalType(ParamType));
4082 return ArgResult;
4083 }
4084
Richard Smith4f870622011-10-27 22:11:44 +00004085 ExprResult ArgResult = DefaultLvalueConversion(Arg);
4086 if (ArgResult.isInvalid())
4087 return ExprError();
4088 Arg = ArgResult.take();
4089
4090 QualType ArgType = Arg->getType();
4091
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004092 // C++ [temp.arg.nontype]p1:
4093 // A template-argument for a non-type, non-template
4094 // template-parameter shall be one of:
4095 //
4096 // -- an integral constant-expression of integral or enumeration
4097 // type; or
4098 // -- the name of a non-type template-parameter; or
4099 SourceLocation NonConstantLoc;
Douglas Gregor3e00bad2009-02-17 01:05:43 +00004100 llvm::APSInt Value;
Douglas Gregor2ade35e2010-06-16 00:17:44 +00004101 if (!ArgType->isIntegralOrEnumerationType()) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004102 Diag(Arg->getLocStart(),
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004103 diag::err_template_arg_not_integral_or_enumeral)
4104 << ArgType << Arg->getSourceRange();
4105 Diag(Param->getLocation(), diag::note_template_param_here);
John Wiegley429bb272011-04-08 18:41:53 +00004106 return ExprError();
Richard Smith282e7e62012-02-04 09:53:13 +00004107 } else if (!Arg->isValueDependent()) {
4108 Arg = VerifyIntegerConstantExpression(Arg, &Value,
4109 PDiag(diag::err_template_arg_not_ice) << ArgType, false).take();
4110 if (!Arg)
4111 return ExprError();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004112 }
4113
Douglas Gregor02024a92010-03-28 02:42:43 +00004114 // From here on out, all we care about are the unqualified forms
4115 // of the parameter and argument types.
4116 ParamType = ParamType.getUnqualifiedType();
4117 ArgType = ArgType.getUnqualifiedType();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004118
4119 // Try to convert the argument to the parameter's type.
Douglas Gregorff524392009-11-04 21:50:46 +00004120 if (Context.hasSameType(ParamType, ArgType)) {
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004121 // Okay: no conversion necessary
John McCalldaa8e4e2010-11-15 09:13:47 +00004122 } else if (ParamType->isBooleanType()) {
4123 // This is an integral-to-boolean conversion.
John Wiegley429bb272011-04-08 18:41:53 +00004124 Arg = ImpCastExprToType(Arg, ParamType, CK_IntegralToBoolean).take();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004125 } else if (IsIntegralPromotion(Arg, ArgType, ParamType) ||
4126 !ParamType->isEnumeralType()) {
4127 // This is an integral promotion or conversion.
John Wiegley429bb272011-04-08 18:41:53 +00004128 Arg = ImpCastExprToType(Arg, ParamType, CK_IntegralCast).take();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004129 } else {
4130 // We can't perform this conversion.
Daniel Dunbar96a00142012-03-09 18:35:03 +00004131 Diag(Arg->getLocStart(),
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004132 diag::err_template_arg_not_convertible)
Douglas Gregor2943aed2009-03-03 04:44:36 +00004133 << Arg->getType() << InstantiatedParamType << Arg->getSourceRange();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004134 Diag(Param->getLocation(), diag::note_template_param_here);
John Wiegley429bb272011-04-08 18:41:53 +00004135 return ExprError();
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004136 }
4137
Douglas Gregorc7469372011-05-04 21:55:00 +00004138 // Add the value of this argument to the list of converted
4139 // arguments. We use the bitwidth and signedness of the template
4140 // parameter.
4141 if (Arg->isValueDependent()) {
4142 // The argument is value-dependent. Create a new
4143 // TemplateArgument with the converted expression.
4144 Converted = TemplateArgument(Arg);
4145 return Owned(Arg);
4146 }
4147
Douglas Gregorf80a9d52009-03-14 00:20:21 +00004148 QualType IntegerType = Context.getCanonicalType(ParamType);
John McCall183700f2009-09-21 23:43:11 +00004149 if (const EnumType *Enum = IntegerType->getAs<EnumType>())
Douglas Gregor02cbbd22009-06-11 18:10:32 +00004150 IntegerType = Context.getCanonicalType(Enum->getDecl()->getIntegerType());
Douglas Gregorf80a9d52009-03-14 00:20:21 +00004151
Douglas Gregorc7469372011-05-04 21:55:00 +00004152 if (ParamType->isBooleanType()) {
4153 // Value must be zero or one.
4154 Value = Value != 0;
4155 unsigned AllowedBits = Context.getTypeSize(IntegerType);
4156 if (Value.getBitWidth() != AllowedBits)
4157 Value = Value.extOrTrunc(AllowedBits);
Douglas Gregor575a1c92011-05-20 16:38:50 +00004158 Value.setIsSigned(IntegerType->isSignedIntegerOrEnumerationType());
Douglas Gregorc7469372011-05-04 21:55:00 +00004159 } else {
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004160 llvm::APSInt OldValue = Value;
Douglas Gregorc7469372011-05-04 21:55:00 +00004161
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004162 // Coerce the template argument's value to the value it will have
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004163 // based on the template parameter's type.
Douglas Gregor0d4fd8e2010-03-26 00:39:40 +00004164 unsigned AllowedBits = Context.getTypeSize(IntegerType);
Douglas Gregor0d4fd8e2010-03-26 00:39:40 +00004165 if (Value.getBitWidth() != AllowedBits)
Jay Foad9f71a8f2010-12-07 08:25:34 +00004166 Value = Value.extOrTrunc(AllowedBits);
Douglas Gregor575a1c92011-05-20 16:38:50 +00004167 Value.setIsSigned(IntegerType->isSignedIntegerOrEnumerationType());
Douglas Gregorc7469372011-05-04 21:55:00 +00004168
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004169 // Complain if an unsigned parameter received a negative value.
Douglas Gregor575a1c92011-05-20 16:38:50 +00004170 if (IntegerType->isUnsignedIntegerOrEnumerationType()
Douglas Gregorc7469372011-05-04 21:55:00 +00004171 && (OldValue.isSigned() && OldValue.isNegative())) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004172 Diag(Arg->getLocStart(), diag::warn_template_arg_negative)
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004173 << OldValue.toString(10) << Value.toString(10) << Param->getType()
4174 << Arg->getSourceRange();
4175 Diag(Param->getLocation(), diag::note_template_param_here);
4176 }
Douglas Gregorc7469372011-05-04 21:55:00 +00004177
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004178 // Complain if we overflowed the template parameter's type.
4179 unsigned RequiredBits;
Douglas Gregor575a1c92011-05-20 16:38:50 +00004180 if (IntegerType->isUnsignedIntegerOrEnumerationType())
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004181 RequiredBits = OldValue.getActiveBits();
4182 else if (OldValue.isUnsigned())
4183 RequiredBits = OldValue.getActiveBits() + 1;
4184 else
4185 RequiredBits = OldValue.getMinSignedBits();
4186 if (RequiredBits > AllowedBits) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004187 Diag(Arg->getLocStart(),
Douglas Gregor1a6e0342010-03-26 02:38:37 +00004188 diag::warn_template_arg_too_large)
4189 << OldValue.toString(10) << Value.toString(10) << Param->getType()
4190 << Arg->getSourceRange();
4191 Diag(Param->getLocation(), diag::note_template_param_here);
4192 }
Douglas Gregorf80a9d52009-03-14 00:20:21 +00004193 }
Douglas Gregor3e00bad2009-02-17 01:05:43 +00004194
John McCall833ca992009-10-29 08:12:44 +00004195 Converted = TemplateArgument(Value,
Douglas Gregor6b63f552011-08-09 01:55:14 +00004196 ParamType->isEnumeralType()
4197 ? Context.getCanonicalType(ParamType)
4198 : IntegerType);
John Wiegley429bb272011-04-08 18:41:53 +00004199 return Owned(Arg);
Douglas Gregor6ae5e662009-02-10 23:36:10 +00004200 }
Douglas Gregora35284b2009-02-11 00:19:33 +00004201
Richard Smith4f870622011-10-27 22:11:44 +00004202 QualType ArgType = Arg->getType();
John McCall6bb80172010-03-30 21:47:33 +00004203 DeclAccessPair FoundResult; // temporary for ResolveOverloadedFunction
4204
Douglas Gregorb86b0572009-02-11 01:18:59 +00004205 // Handle pointer-to-function, reference-to-function, and
4206 // pointer-to-member-function all in (roughly) the same way.
4207 if (// -- For a non-type template-parameter of type pointer to
4208 // function, only the function-to-pointer conversion (4.3) is
4209 // applied. If the template-argument represents a set of
4210 // overloaded functions (or a pointer to such), the matching
4211 // function is selected from the set (13.4).
4212 (ParamType->isPointerType() &&
Ted Kremenek6217b802009-07-29 21:53:49 +00004213 ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType()) ||
Douglas Gregorb86b0572009-02-11 01:18:59 +00004214 // -- For a non-type template-parameter of type reference to
4215 // function, no conversions apply. If the template-argument
4216 // represents a set of overloaded functions, the matching
4217 // function is selected from the set (13.4).
4218 (ParamType->isReferenceType() &&
Ted Kremenek6217b802009-07-29 21:53:49 +00004219 ParamType->getAs<ReferenceType>()->getPointeeType()->isFunctionType()) ||
Douglas Gregorb86b0572009-02-11 01:18:59 +00004220 // -- For a non-type template-parameter of type pointer to
4221 // member function, no conversions apply. If the
4222 // template-argument represents a set of overloaded member
4223 // functions, the matching member function is selected from
4224 // the set (13.4).
4225 (ParamType->isMemberPointerType() &&
Ted Kremenek6217b802009-07-29 21:53:49 +00004226 ParamType->getAs<MemberPointerType>()->getPointeeType()
Douglas Gregorb86b0572009-02-11 01:18:59 +00004227 ->isFunctionType())) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00004228
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004229 if (Arg->getType() == Context.OverloadTy) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004230 if (FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Arg, ParamType,
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004231 true,
4232 FoundResult)) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004233 if (DiagnoseUseOfDecl(Fn, Arg->getLocStart()))
John Wiegley429bb272011-04-08 18:41:53 +00004234 return ExprError();
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004235
4236 Arg = FixOverloadedFunctionReference(Arg, FoundResult, Fn);
4237 ArgType = Arg->getType();
4238 } else
John Wiegley429bb272011-04-08 18:41:53 +00004239 return ExprError();
Douglas Gregora35284b2009-02-11 00:19:33 +00004240 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004241
John Wiegley429bb272011-04-08 18:41:53 +00004242 if (!ParamType->isMemberPointerType()) {
4243 if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param,
4244 ParamType,
4245 Arg, Converted))
4246 return ExprError();
4247 return Owned(Arg);
4248 }
Douglas Gregorb7a09262010-04-01 18:32:35 +00004249
Douglas Gregor42963612012-04-10 17:08:25 +00004250 if (CheckTemplateArgumentPointerToMember(*this, Param, ParamType, Arg,
4251 Converted))
John Wiegley429bb272011-04-08 18:41:53 +00004252 return ExprError();
4253 return Owned(Arg);
Douglas Gregora35284b2009-02-11 00:19:33 +00004254 }
4255
Chris Lattnerfe90de72009-02-20 21:37:53 +00004256 if (ParamType->isPointerType()) {
Douglas Gregorb86b0572009-02-11 01:18:59 +00004257 // -- for a non-type template-parameter of type pointer to
4258 // object, qualification conversions (4.4) and the
4259 // array-to-pointer conversion (4.2) are applied.
Sebastian Redl6e8ed162009-05-10 18:38:11 +00004260 // C++0x also allows a value of std::nullptr_t.
Eli Friedman13578692010-08-05 02:49:48 +00004261 assert(ParamType->getPointeeType()->isIncompleteOrObjectType() &&
Douglas Gregorb86b0572009-02-11 01:18:59 +00004262 "Only object pointers allowed here");
Douglas Gregorf684e6e2009-02-11 00:44:29 +00004263
John Wiegley429bb272011-04-08 18:41:53 +00004264 if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param,
4265 ParamType,
4266 Arg, Converted))
4267 return ExprError();
4268 return Owned(Arg);
Douglas Gregorf684e6e2009-02-11 00:44:29 +00004269 }
Mike Stump1eb44332009-09-09 15:08:12 +00004270
Ted Kremenek6217b802009-07-29 21:53:49 +00004271 if (const ReferenceType *ParamRefType = ParamType->getAs<ReferenceType>()) {
Douglas Gregorb86b0572009-02-11 01:18:59 +00004272 // -- For a non-type template-parameter of type reference to
4273 // object, no conversions apply. The type referred to by the
4274 // reference may be more cv-qualified than the (otherwise
4275 // identical) type of the template-argument. The
4276 // template-parameter is bound directly to the
4277 // template-argument, which must be an lvalue.
Eli Friedman13578692010-08-05 02:49:48 +00004278 assert(ParamRefType->getPointeeType()->isIncompleteOrObjectType() &&
Douglas Gregorb86b0572009-02-11 01:18:59 +00004279 "Only object references allowed here");
Douglas Gregorf684e6e2009-02-11 00:44:29 +00004280
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004281 if (Arg->getType() == Context.OverloadTy) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004282 if (FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Arg,
4283 ParamRefType->getPointeeType(),
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004284 true,
4285 FoundResult)) {
Daniel Dunbar96a00142012-03-09 18:35:03 +00004286 if (DiagnoseUseOfDecl(Fn, Arg->getLocStart()))
John Wiegley429bb272011-04-08 18:41:53 +00004287 return ExprError();
Douglas Gregor1a8cf732010-04-14 23:11:21 +00004288
4289 Arg = FixOverloadedFunctionReference(Arg, FoundResult, Fn);
4290 ArgType = Arg->getType();
4291 } else
John Wiegley429bb272011-04-08 18:41:53 +00004292 return ExprError();
Douglas Gregorb86b0572009-02-11 01:18:59 +00004293 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004294
John Wiegley429bb272011-04-08 18:41:53 +00004295 if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param,
4296 ParamType,
4297 Arg, Converted))
4298 return ExprError();
4299 return Owned(Arg);
Douglas Gregorb86b0572009-02-11 01:18:59 +00004300 }
Douglas Gregor658bbb52009-02-11 16:16:59 +00004301
Douglas Gregor42963612012-04-10 17:08:25 +00004302 // Deal with parameters of type std::nullptr_t.
4303 if (ParamType->isNullPtrType()) {
4304 if (Arg->isTypeDependent() || Arg->isValueDependent()) {
4305 Converted = TemplateArgument(Arg);
4306 return Owned(Arg);
4307 }
4308
4309 switch (isNullPointerValueTemplateArgument(*this, Param, ParamType, Arg)) {
4310 case NPV_NotNullPointer:
4311 Diag(Arg->getExprLoc(), diag::err_template_arg_not_convertible)
4312 << Arg->getType() << ParamType;
4313 Diag(Param->getLocation(), diag::note_template_param_here);
4314 return ExprError();
4315
4316 case NPV_Error:
4317 return ExprError();
4318
4319 case NPV_NullPointer:
4320 Converted = TemplateArgument((Decl *)0);
4321 return Owned(Arg);;
4322 }
4323 }
4324
Douglas Gregor658bbb52009-02-11 16:16:59 +00004325 // -- For a non-type template-parameter of type pointer to data
4326 // member, qualification conversions (4.4) are applied.
4327 assert(ParamType->isMemberPointerType() && "Only pointers to members remain");
4328
Douglas Gregor42963612012-04-10 17:08:25 +00004329 if (CheckTemplateArgumentPointerToMember(*this, Param, ParamType, Arg,
4330 Converted))
John Wiegley429bb272011-04-08 18:41:53 +00004331 return ExprError();
4332 return Owned(Arg);
Douglas Gregorc15cb382009-02-09 23:23:08 +00004333}
4334
4335/// \brief Check a template argument against its corresponding
4336/// template template parameter.
4337///
4338/// This routine implements the semantics of C++ [temp.arg.template].
4339/// It returns true if an error occurred, and false otherwise.
4340bool Sema::CheckTemplateArgument(TemplateTemplateParmDecl *Param,
Douglas Gregor788cd062009-11-11 01:00:40 +00004341 const TemplateArgumentLoc &Arg) {
4342 TemplateName Name = Arg.getArgument().getAsTemplate();
4343 TemplateDecl *Template = Name.getAsTemplateDecl();
4344 if (!Template) {
4345 // Any dependent template name is fine.
4346 assert(Name.isDependent() && "Non-dependent template isn't a declaration?");
4347 return false;
4348 }
Douglas Gregordd0574e2009-02-10 00:24:35 +00004349
Richard Smith3e4c6c42011-05-05 21:57:07 +00004350 // C++0x [temp.arg.template]p1:
Douglas Gregordd0574e2009-02-10 00:24:35 +00004351 // A template-argument for a template template-parameter shall be
Richard Smith3e4c6c42011-05-05 21:57:07 +00004352 // the name of a class template or an alias template, expressed as an
4353 // id-expression. When the template-argument names a class template, only
Douglas Gregordd0574e2009-02-10 00:24:35 +00004354 // primary class templates are considered when matching the
4355 // template template argument with the corresponding parameter;
4356 // partial specializations are not considered even if their
4357 // parameter lists match that of the template template parameter.
Douglas Gregorba1ecb52009-06-12 19:43:02 +00004358 //
4359 // Note that we also allow template template parameters here, which
4360 // will happen when we are dealing with, e.g., class template
4361 // partial specializations.
Mike Stump1eb44332009-09-09 15:08:12 +00004362 if (!isa<ClassTemplateDecl>(Template) &&
Richard Smith3e4c6c42011-05-05 21:57:07 +00004363 !isa<TemplateTemplateParmDecl>(Template) &&
4364 !isa<TypeAliasTemplateDecl>(Template)) {
Mike Stump1eb44332009-09-09 15:08:12 +00004365 assert(isa<FunctionTemplateDecl>(Template) &&
Douglas Gregordd0574e2009-02-10 00:24:35 +00004366 "Only function templates are possible here");
Douglas Gregor788cd062009-11-11 01:00:40 +00004367 Diag(Arg.getLocation(), diag::err_template_arg_not_class_template);
Douglas Gregore53060f2009-06-25 22:08:12 +00004368 Diag(Template->getLocation(), diag::note_template_arg_refers_here_func)
Douglas Gregordd0574e2009-02-10 00:24:35 +00004369 << Template;
4370 }
4371
4372 return !TemplateParameterListsAreEqual(Template->getTemplateParameters(),
4373 Param->getTemplateParameters(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004374 true,
Douglas Gregorfb898e12009-11-12 16:20:59 +00004375 TPL_TemplateTemplateArgumentMatch,
Douglas Gregor788cd062009-11-11 01:00:40 +00004376 Arg.getLocation());
Douglas Gregorc15cb382009-02-09 23:23:08 +00004377}
4378
Douglas Gregor02024a92010-03-28 02:42:43 +00004379/// \brief Given a non-type template argument that refers to a
4380/// declaration and the type of its corresponding non-type template
4381/// parameter, produce an expression that properly refers to that
4382/// declaration.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004383ExprResult
Douglas Gregor02024a92010-03-28 02:42:43 +00004384Sema::BuildExpressionFromDeclTemplateArgument(const TemplateArgument &Arg,
4385 QualType ParamType,
4386 SourceLocation Loc) {
4387 assert(Arg.getKind() == TemplateArgument::Declaration &&
4388 "Only declaration template arguments permitted here");
Douglas Gregord2008e22012-04-06 22:40:38 +00004389
4390 // For a NULL non-type template argument, return nullptr casted to the
4391 // parameter's type.
4392 if (!Arg.getAsDecl()) {
4393 return ImpCastExprToType(
4394 new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc),
4395 ParamType,
4396 ParamType->getAs<MemberPointerType>()
4397 ? CK_NullToMemberPointer
4398 : CK_NullToPointer);
4399 }
4400
Douglas Gregor02024a92010-03-28 02:42:43 +00004401 ValueDecl *VD = cast<ValueDecl>(Arg.getAsDecl());
4402
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004403 if (VD->getDeclContext()->isRecord() &&
Douglas Gregor02024a92010-03-28 02:42:43 +00004404 (isa<CXXMethodDecl>(VD) || isa<FieldDecl>(VD))) {
4405 // If the value is a class member, we might have a pointer-to-member.
4406 // Determine whether the non-type template template parameter is of
4407 // pointer-to-member type. If so, we need to build an appropriate
4408 // expression for a pointer-to-member, since a "normal" DeclRefExpr
4409 // would refer to the member itself.
4410 if (ParamType->isMemberPointerType()) {
4411 QualType ClassType
4412 = Context.getTypeDeclType(cast<RecordDecl>(VD->getDeclContext()));
4413 NestedNameSpecifier *Qualifier
John McCall9ae2f072010-08-23 23:25:46 +00004414 = NestedNameSpecifier::Create(Context, 0, false,
4415 ClassType.getTypePtr());
Douglas Gregor02024a92010-03-28 02:42:43 +00004416 CXXScopeSpec SS;
Douglas Gregorc34348a2011-02-24 17:54:50 +00004417 SS.MakeTrivial(Context, Qualifier, Loc);
John McCalldfa1edb2010-11-23 20:48:44 +00004418
4419 // The actual value-ness of this is unimportant, but for
4420 // internal consistency's sake, references to instance methods
4421 // are r-values.
4422 ExprValueKind VK = VK_LValue;
4423 if (isa<CXXMethodDecl>(VD) && cast<CXXMethodDecl>(VD)->isInstance())
4424 VK = VK_RValue;
4425
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004426 ExprResult RefExpr = BuildDeclRefExpr(VD,
John McCallf89e55a2010-11-18 06:31:45 +00004427 VD->getType().getNonReferenceType(),
John McCalldfa1edb2010-11-23 20:48:44 +00004428 VK,
John McCallf89e55a2010-11-18 06:31:45 +00004429 Loc,
4430 &SS);
Douglas Gregor02024a92010-03-28 02:42:43 +00004431 if (RefExpr.isInvalid())
4432 return ExprError();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004433
John McCall2de56d12010-08-25 11:45:40 +00004434 RefExpr = CreateBuiltinUnaryOp(Loc, UO_AddrOf, RefExpr.get());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004435
Douglas Gregorc0c83002010-04-30 21:46:38 +00004436 // We might need to perform a trailing qualification conversion, since
4437 // the element type on the parameter could be more qualified than the
4438 // element type in the expression we constructed.
John McCallf85e1932011-06-15 23:02:42 +00004439 bool ObjCLifetimeConversion;
Douglas Gregorc0c83002010-04-30 21:46:38 +00004440 if (IsQualificationConversion(((Expr*) RefExpr.get())->getType(),
John McCallf85e1932011-06-15 23:02:42 +00004441 ParamType.getUnqualifiedType(), false,
4442 ObjCLifetimeConversion))
John Wiegley429bb272011-04-08 18:41:53 +00004443 RefExpr = ImpCastExprToType(RefExpr.take(), ParamType.getUnqualifiedType(), CK_NoOp);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004444
Douglas Gregor02024a92010-03-28 02:42:43 +00004445 assert(!RefExpr.isInvalid() &&
4446 Context.hasSameType(((Expr*) RefExpr.get())->getType(),
Douglas Gregorc0c83002010-04-30 21:46:38 +00004447 ParamType.getUnqualifiedType()));
Douglas Gregor02024a92010-03-28 02:42:43 +00004448 return move(RefExpr);
4449 }
4450 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004451
Douglas Gregor02024a92010-03-28 02:42:43 +00004452 QualType T = VD->getType().getNonReferenceType();
4453 if (ParamType->isPointerType()) {
Douglas Gregorb7a09262010-04-01 18:32:35 +00004454 // When the non-type template parameter is a pointer, take the
4455 // address of the declaration.
John McCallf89e55a2010-11-18 06:31:45 +00004456 ExprResult RefExpr = BuildDeclRefExpr(VD, T, VK_LValue, Loc);
Douglas Gregor02024a92010-03-28 02:42:43 +00004457 if (RefExpr.isInvalid())
4458 return ExprError();
Douglas Gregorb7a09262010-04-01 18:32:35 +00004459
4460 if (T->isFunctionType() || T->isArrayType()) {
4461 // Decay functions and arrays.
John Wiegley429bb272011-04-08 18:41:53 +00004462 RefExpr = DefaultFunctionArrayConversion(RefExpr.take());
4463 if (RefExpr.isInvalid())
4464 return ExprError();
Douglas Gregorb7a09262010-04-01 18:32:35 +00004465
4466 return move(RefExpr);
Douglas Gregor02024a92010-03-28 02:42:43 +00004467 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004468
Douglas Gregorb7a09262010-04-01 18:32:35 +00004469 // Take the address of everything else
John McCall2de56d12010-08-25 11:45:40 +00004470 return CreateBuiltinUnaryOp(Loc, UO_AddrOf, RefExpr.get());
Douglas Gregor02024a92010-03-28 02:42:43 +00004471 }
4472
John McCallf89e55a2010-11-18 06:31:45 +00004473 ExprValueKind VK = VK_RValue;
4474
Douglas Gregor02024a92010-03-28 02:42:43 +00004475 // If the non-type template parameter has reference type, qualify the
4476 // resulting declaration reference with the extra qualifiers on the
4477 // type that the reference refers to.
John McCallf89e55a2010-11-18 06:31:45 +00004478 if (const ReferenceType *TargetRef = ParamType->getAs<ReferenceType>()) {
4479 VK = VK_LValue;
4480 T = Context.getQualifiedType(T,
4481 TargetRef->getPointeeType().getQualifiers());
4482 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004483
John McCallf89e55a2010-11-18 06:31:45 +00004484 return BuildDeclRefExpr(VD, T, VK, Loc);
Douglas Gregor02024a92010-03-28 02:42:43 +00004485}
4486
4487/// \brief Construct a new expression that refers to the given
4488/// integral template argument with the given source-location
4489/// information.
4490///
4491/// This routine takes care of the mapping from an integral template
4492/// argument (which may have any integral type) to the appropriate
4493/// literal value.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004494ExprResult
Douglas Gregor02024a92010-03-28 02:42:43 +00004495Sema::BuildExpressionFromIntegralTemplateArgument(const TemplateArgument &Arg,
4496 SourceLocation Loc) {
4497 assert(Arg.getKind() == TemplateArgument::Integral &&
Douglas Gregord3731192011-01-10 07:32:04 +00004498 "Operation is only valid for integral template arguments");
Douglas Gregor02024a92010-03-28 02:42:43 +00004499 QualType T = Arg.getIntegralType();
Douglas Gregor5cee1192011-07-27 05:40:30 +00004500 if (T->isAnyCharacterType()) {
4501 CharacterLiteral::CharacterKind Kind;
4502 if (T->isWideCharType())
4503 Kind = CharacterLiteral::Wide;
4504 else if (T->isChar16Type())
4505 Kind = CharacterLiteral::UTF16;
4506 else if (T->isChar32Type())
4507 Kind = CharacterLiteral::UTF32;
4508 else
4509 Kind = CharacterLiteral::Ascii;
4510
Douglas Gregor02024a92010-03-28 02:42:43 +00004511 return Owned(new (Context) CharacterLiteral(
Douglas Gregor5cee1192011-07-27 05:40:30 +00004512 Arg.getAsIntegral()->getZExtValue(),
4513 Kind, T, Loc));
4514 }
4515
Douglas Gregor02024a92010-03-28 02:42:43 +00004516 if (T->isBooleanType())
4517 return Owned(new (Context) CXXBoolLiteralExpr(
4518 Arg.getAsIntegral()->getBoolValue(),
Chris Lattner223de242011-04-25 20:37:58 +00004519 T, Loc));
Douglas Gregor02024a92010-03-28 02:42:43 +00004520
Douglas Gregor84ee2ee2011-05-21 23:15:46 +00004521 if (T->isNullPtrType())
4522 return Owned(new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc));
4523
Chris Lattner223de242011-04-25 20:37:58 +00004524 // If this is an enum type that we're instantiating, we need to use an integer
4525 // type the same size as the enumerator. We don't want to build an
4526 // IntegerLiteral with enum type.
Peter Collingbournefb7b3632010-12-15 15:06:14 +00004527 QualType BT;
4528 if (const EnumType *ET = T->getAs<EnumType>())
Chris Lattner223de242011-04-25 20:37:58 +00004529 BT = ET->getDecl()->getIntegerType();
Peter Collingbournefb7b3632010-12-15 15:06:14 +00004530 else
4531 BT = T;
4532
John McCall4e9272d2011-07-15 07:47:58 +00004533 Expr *E = IntegerLiteral::Create(Context, *Arg.getAsIntegral(), BT, Loc);
4534 if (T->isEnumeralType()) {
4535 // FIXME: This is a hack. We need a better way to handle substituted
4536 // non-type template parameters.
4537 E = CStyleCastExpr::Create(Context, T, VK_RValue, CK_IntegralCast, E, 0,
4538 Context.getTrivialTypeSourceInfo(T, Loc),
4539 Loc, Loc);
4540 }
4541
4542 return Owned(E);
Douglas Gregor02024a92010-03-28 02:42:43 +00004543}
4544
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004545/// \brief Match two template parameters within template parameter lists.
4546static bool MatchTemplateParameterKind(Sema &S, NamedDecl *New, NamedDecl *Old,
4547 bool Complain,
4548 Sema::TemplateParameterListEqualKind Kind,
4549 SourceLocation TemplateArgLoc) {
4550 // Check the actual kind (type, non-type, template).
4551 if (Old->getKind() != New->getKind()) {
4552 if (Complain) {
4553 unsigned NextDiag = diag::err_template_param_different_kind;
4554 if (TemplateArgLoc.isValid()) {
4555 S.Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch);
4556 NextDiag = diag::note_template_param_different_kind;
4557 }
4558 S.Diag(New->getLocation(), NextDiag)
4559 << (Kind != Sema::TPL_TemplateMatch);
4560 S.Diag(Old->getLocation(), diag::note_template_prev_declaration)
4561 << (Kind != Sema::TPL_TemplateMatch);
4562 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004563
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004564 return false;
4565 }
4566
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004567 // Check that both are parameter packs are neither are parameter packs.
4568 // However, if we are matching a template template argument to a
Douglas Gregora0347822011-01-13 00:08:50 +00004569 // template template parameter, the template template parameter can have
4570 // a parameter pack where the template template argument does not.
4571 if (Old->isTemplateParameterPack() != New->isTemplateParameterPack() &&
4572 !(Kind == Sema::TPL_TemplateTemplateArgumentMatch &&
4573 Old->isTemplateParameterPack())) {
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004574 if (Complain) {
4575 unsigned NextDiag = diag::err_template_parameter_pack_non_pack;
4576 if (TemplateArgLoc.isValid()) {
4577 S.Diag(TemplateArgLoc,
4578 diag::err_template_arg_template_params_mismatch);
4579 NextDiag = diag::note_template_parameter_pack_non_pack;
4580 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004581
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004582 unsigned ParamKind = isa<TemplateTypeParmDecl>(New)? 0
4583 : isa<NonTypeTemplateParmDecl>(New)? 1
4584 : 2;
4585 S.Diag(New->getLocation(), NextDiag)
4586 << ParamKind << New->isParameterPack();
4587 S.Diag(Old->getLocation(), diag::note_template_parameter_pack_here)
4588 << ParamKind << Old->isParameterPack();
4589 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004590
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004591 return false;
4592 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004593
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004594 // For non-type template parameters, check the type of the parameter.
4595 if (NonTypeTemplateParmDecl *OldNTTP
4596 = dyn_cast<NonTypeTemplateParmDecl>(Old)) {
4597 NonTypeTemplateParmDecl *NewNTTP = cast<NonTypeTemplateParmDecl>(New);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004598
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004599 // If we are matching a template template argument to a template
4600 // template parameter and one of the non-type template parameter types
4601 // is dependent, then we must wait until template instantiation time
4602 // to actually compare the arguments.
4603 if (Kind == Sema::TPL_TemplateTemplateArgumentMatch &&
4604 (OldNTTP->getType()->isDependentType() ||
4605 NewNTTP->getType()->isDependentType()))
4606 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004607
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004608 if (!S.Context.hasSameType(OldNTTP->getType(), NewNTTP->getType())) {
4609 if (Complain) {
4610 unsigned NextDiag = diag::err_template_nontype_parm_different_type;
4611 if (TemplateArgLoc.isValid()) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004612 S.Diag(TemplateArgLoc,
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004613 diag::err_template_arg_template_params_mismatch);
4614 NextDiag = diag::note_template_nontype_parm_different_type;
4615 }
4616 S.Diag(NewNTTP->getLocation(), NextDiag)
4617 << NewNTTP->getType()
4618 << (Kind != Sema::TPL_TemplateMatch);
4619 S.Diag(OldNTTP->getLocation(),
4620 diag::note_template_nontype_parm_prev_declaration)
4621 << OldNTTP->getType();
4622 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004623
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004624 return false;
4625 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004626
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004627 return true;
4628 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004629
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004630 // For template template parameters, check the template parameter types.
4631 // The template parameter lists of template template
4632 // parameters must agree.
4633 if (TemplateTemplateParmDecl *OldTTP
4634 = dyn_cast<TemplateTemplateParmDecl>(Old)) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004635 TemplateTemplateParmDecl *NewTTP = cast<TemplateTemplateParmDecl>(New);
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004636 return S.TemplateParameterListsAreEqual(NewTTP->getTemplateParameters(),
4637 OldTTP->getTemplateParameters(),
4638 Complain,
4639 (Kind == Sema::TPL_TemplateMatch
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004640 ? Sema::TPL_TemplateTemplateParmMatch
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004641 : Kind),
4642 TemplateArgLoc);
4643 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004644
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004645 return true;
4646}
Douglas Gregor02024a92010-03-28 02:42:43 +00004647
Douglas Gregora0347822011-01-13 00:08:50 +00004648/// \brief Diagnose a known arity mismatch when comparing template argument
4649/// lists.
4650static
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004651void DiagnoseTemplateParameterListArityMismatch(Sema &S,
Douglas Gregora0347822011-01-13 00:08:50 +00004652 TemplateParameterList *New,
4653 TemplateParameterList *Old,
4654 Sema::TemplateParameterListEqualKind Kind,
4655 SourceLocation TemplateArgLoc) {
4656 unsigned NextDiag = diag::err_template_param_list_different_arity;
4657 if (TemplateArgLoc.isValid()) {
4658 S.Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch);
4659 NextDiag = diag::note_template_param_list_different_arity;
4660 }
4661 S.Diag(New->getTemplateLoc(), NextDiag)
4662 << (New->size() > Old->size())
4663 << (Kind != Sema::TPL_TemplateMatch)
4664 << SourceRange(New->getTemplateLoc(), New->getRAngleLoc());
4665 S.Diag(Old->getTemplateLoc(), diag::note_template_prev_declaration)
4666 << (Kind != Sema::TPL_TemplateMatch)
4667 << SourceRange(Old->getTemplateLoc(), Old->getRAngleLoc());
4668}
4669
Douglas Gregorddc29e12009-02-06 22:42:48 +00004670/// \brief Determine whether the given template parameter lists are
4671/// equivalent.
4672///
Mike Stump1eb44332009-09-09 15:08:12 +00004673/// \param New The new template parameter list, typically written in the
Douglas Gregorddc29e12009-02-06 22:42:48 +00004674/// source code as part of a new template declaration.
4675///
4676/// \param Old The old template parameter list, typically found via
4677/// name lookup of the template declared with this template parameter
4678/// list.
4679///
4680/// \param Complain If true, this routine will produce a diagnostic if
4681/// the template parameter lists are not equivalent.
4682///
Douglas Gregorfb898e12009-11-12 16:20:59 +00004683/// \param Kind describes how we are to match the template parameter lists.
Douglas Gregordd0574e2009-02-10 00:24:35 +00004684///
4685/// \param TemplateArgLoc If this source location is valid, then we
4686/// are actually checking the template parameter list of a template
4687/// argument (New) against the template parameter list of its
4688/// corresponding template template parameter (Old). We produce
4689/// slightly different diagnostics in this scenario.
4690///
Douglas Gregorddc29e12009-02-06 22:42:48 +00004691/// \returns True if the template parameter lists are equal, false
4692/// otherwise.
Mike Stump1eb44332009-09-09 15:08:12 +00004693bool
Douglas Gregorddc29e12009-02-06 22:42:48 +00004694Sema::TemplateParameterListsAreEqual(TemplateParameterList *New,
4695 TemplateParameterList *Old,
4696 bool Complain,
Douglas Gregorfb898e12009-11-12 16:20:59 +00004697 TemplateParameterListEqualKind Kind,
Douglas Gregordd0574e2009-02-10 00:24:35 +00004698 SourceLocation TemplateArgLoc) {
Douglas Gregora0347822011-01-13 00:08:50 +00004699 if (Old->size() != New->size() && Kind != TPL_TemplateTemplateArgumentMatch) {
4700 if (Complain)
4701 DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind,
4702 TemplateArgLoc);
Douglas Gregorddc29e12009-02-06 22:42:48 +00004703
4704 return false;
4705 }
4706
Douglas Gregorab7ddf02011-01-12 23:45:44 +00004707 // C++0x [temp.arg.template]p3:
4708 // A template-argument matches a template template-parameter (call it P)
NAKAMURA Takumi00995302011-01-27 07:09:49 +00004709 // when each of the template parameters in the template-parameter-list of
Richard Smith3e4c6c42011-05-05 21:57:07 +00004710 // the template-argument's corresponding class template or alias template
NAKAMURA Takumi00995302011-01-27 07:09:49 +00004711 // (call it A) matches the corresponding template parameter in the
Douglas Gregora0347822011-01-13 00:08:50 +00004712 // template-parameter-list of P. [...]
4713 TemplateParameterList::iterator NewParm = New->begin();
4714 TemplateParameterList::iterator NewParmEnd = New->end();
Douglas Gregorddc29e12009-02-06 22:42:48 +00004715 for (TemplateParameterList::iterator OldParm = Old->begin(),
Douglas Gregora0347822011-01-13 00:08:50 +00004716 OldParmEnd = Old->end();
4717 OldParm != OldParmEnd; ++OldParm) {
Douglas Gregorc421f542011-01-13 18:47:47 +00004718 if (Kind != TPL_TemplateTemplateArgumentMatch ||
4719 !(*OldParm)->isTemplateParameterPack()) {
Douglas Gregora0347822011-01-13 00:08:50 +00004720 if (NewParm == NewParmEnd) {
4721 if (Complain)
4722 DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind,
4723 TemplateArgLoc);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004724
Douglas Gregora0347822011-01-13 00:08:50 +00004725 return false;
4726 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004727
Douglas Gregora0347822011-01-13 00:08:50 +00004728 if (!MatchTemplateParameterKind(*this, *NewParm, *OldParm, Complain,
4729 Kind, TemplateArgLoc))
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004730 return false;
4731
Douglas Gregora0347822011-01-13 00:08:50 +00004732 ++NewParm;
4733 continue;
4734 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004735
Douglas Gregora0347822011-01-13 00:08:50 +00004736 // C++0x [temp.arg.template]p3:
NAKAMURA Takumi00995302011-01-27 07:09:49 +00004737 // [...] When P's template- parameter-list contains a template parameter
4738 // pack (14.5.3), the template parameter pack will match zero or more
4739 // template parameters or template parameter packs in the
Douglas Gregora0347822011-01-13 00:08:50 +00004740 // template-parameter-list of A with the same type and form as the
4741 // template parameter pack in P (ignoring whether those template
4742 // parameters are template parameter packs).
4743 for (; NewParm != NewParmEnd; ++NewParm) {
4744 if (!MatchTemplateParameterKind(*this, *NewParm, *OldParm, Complain,
4745 Kind, TemplateArgLoc))
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004746 return false;
Douglas Gregora0347822011-01-13 00:08:50 +00004747 }
Douglas Gregorddc29e12009-02-06 22:42:48 +00004748 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004749
Douglas Gregora0347822011-01-13 00:08:50 +00004750 // Make sure we exhausted all of the arguments.
4751 if (NewParm != NewParmEnd) {
4752 if (Complain)
4753 DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind,
4754 TemplateArgLoc);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004755
Douglas Gregora0347822011-01-13 00:08:50 +00004756 return false;
4757 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004758
Douglas Gregorddc29e12009-02-06 22:42:48 +00004759 return true;
4760}
4761
4762/// \brief Check whether a template can be declared within this scope.
4763///
4764/// If the template declaration is valid in this scope, returns
4765/// false. Otherwise, issues a diagnostic and returns true.
Mike Stump1eb44332009-09-09 15:08:12 +00004766bool
Douglas Gregor05396e22009-08-25 17:23:04 +00004767Sema::CheckTemplateDeclScope(Scope *S, TemplateParameterList *TemplateParams) {
Douglas Gregorfb35e8f2011-11-03 16:37:14 +00004768 if (!S)
4769 return false;
4770
Douglas Gregorddc29e12009-02-06 22:42:48 +00004771 // Find the nearest enclosing declaration scope.
4772 while ((S->getFlags() & Scope::DeclScope) == 0 ||
4773 (S->getFlags() & Scope::TemplateParamScope) != 0)
4774 S = S->getParent();
Mike Stump1eb44332009-09-09 15:08:12 +00004775
Douglas Gregorddc29e12009-02-06 22:42:48 +00004776 // C++ [temp]p2:
4777 // A template-declaration can appear only as a namespace scope or
4778 // class scope declaration.
4779 DeclContext *Ctx = static_cast<DeclContext *>(S->getEntity());
Eli Friedman1503f772009-07-31 01:43:05 +00004780 if (Ctx && isa<LinkageSpecDecl>(Ctx) &&
4781 cast<LinkageSpecDecl>(Ctx)->getLanguage() != LinkageSpecDecl::lang_cxx)
Mike Stump1eb44332009-09-09 15:08:12 +00004782 return Diag(TemplateParams->getTemplateLoc(), diag::err_template_linkage)
Douglas Gregor05396e22009-08-25 17:23:04 +00004783 << TemplateParams->getSourceRange();
Mike Stump1eb44332009-09-09 15:08:12 +00004784
Eli Friedman1503f772009-07-31 01:43:05 +00004785 while (Ctx && isa<LinkageSpecDecl>(Ctx))
Douglas Gregorddc29e12009-02-06 22:42:48 +00004786 Ctx = Ctx->getParent();
Douglas Gregorddc29e12009-02-06 22:42:48 +00004787
4788 if (Ctx && (Ctx->isFileContext() || Ctx->isRecord()))
4789 return false;
4790
Mike Stump1eb44332009-09-09 15:08:12 +00004791 return Diag(TemplateParams->getTemplateLoc(),
Douglas Gregor05396e22009-08-25 17:23:04 +00004792 diag::err_template_outside_namespace_or_class_scope)
4793 << TemplateParams->getSourceRange();
Douglas Gregorddc29e12009-02-06 22:42:48 +00004794}
Douglas Gregorcc636682009-02-17 23:15:12 +00004795
Douglas Gregord5cb8762009-10-07 00:13:32 +00004796/// \brief Determine what kind of template specialization the given declaration
4797/// is.
Douglas Gregorf785a7d2012-01-14 15:55:47 +00004798static TemplateSpecializationKind getTemplateSpecializationKind(Decl *D) {
Douglas Gregord5cb8762009-10-07 00:13:32 +00004799 if (!D)
4800 return TSK_Undeclared;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004801
Douglas Gregorf6b11852009-10-08 15:14:33 +00004802 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D))
4803 return Record->getTemplateSpecializationKind();
Douglas Gregord5cb8762009-10-07 00:13:32 +00004804 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D))
4805 return Function->getTemplateSpecializationKind();
Douglas Gregor251b4ff2009-10-08 07:24:58 +00004806 if (VarDecl *Var = dyn_cast<VarDecl>(D))
4807 return Var->getTemplateSpecializationKind();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004808
Douglas Gregord5cb8762009-10-07 00:13:32 +00004809 return TSK_Undeclared;
4810}
4811
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004812/// \brief Check whether a specialization is well-formed in the current
Douglas Gregor9302da62009-10-14 23:50:59 +00004813/// context.
Douglas Gregor88b70942009-02-25 22:02:03 +00004814///
Douglas Gregor9302da62009-10-14 23:50:59 +00004815/// This routine determines whether a template specialization can be declared
4816/// in the current context (C++ [temp.expl.spec]p2).
Douglas Gregord5cb8762009-10-07 00:13:32 +00004817///
4818/// \param S the semantic analysis object for which this check is being
4819/// performed.
4820///
4821/// \param Specialized the entity being specialized or instantiated, which
4822/// may be a kind of template (class template, function template, etc.) or
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004823/// a member of a class template (member function, static data member,
Douglas Gregord5cb8762009-10-07 00:13:32 +00004824/// member class).
4825///
4826/// \param PrevDecl the previous declaration of this entity, if any.
4827///
4828/// \param Loc the location of the explicit specialization or instantiation of
4829/// this entity.
4830///
4831/// \param IsPartialSpecialization whether this is a partial specialization of
4832/// a class template.
4833///
Douglas Gregord5cb8762009-10-07 00:13:32 +00004834/// \returns true if there was an error that we cannot recover from, false
4835/// otherwise.
4836static bool CheckTemplateSpecializationScope(Sema &S,
4837 NamedDecl *Specialized,
4838 NamedDecl *PrevDecl,
4839 SourceLocation Loc,
Douglas Gregor9302da62009-10-14 23:50:59 +00004840 bool IsPartialSpecialization) {
Douglas Gregord5cb8762009-10-07 00:13:32 +00004841 // Keep these "kind" numbers in sync with the %select statements in the
4842 // various diagnostics emitted by this routine.
4843 int EntityKind = 0;
Ted Kremenekfe62b062011-01-14 22:31:36 +00004844 if (isa<ClassTemplateDecl>(Specialized))
Douglas Gregord5cb8762009-10-07 00:13:32 +00004845 EntityKind = IsPartialSpecialization? 1 : 0;
Ted Kremenekfe62b062011-01-14 22:31:36 +00004846 else if (isa<FunctionTemplateDecl>(Specialized))
Douglas Gregord5cb8762009-10-07 00:13:32 +00004847 EntityKind = 2;
Ted Kremenekfe62b062011-01-14 22:31:36 +00004848 else if (isa<CXXMethodDecl>(Specialized))
Douglas Gregord5cb8762009-10-07 00:13:32 +00004849 EntityKind = 3;
4850 else if (isa<VarDecl>(Specialized))
4851 EntityKind = 4;
4852 else if (isa<RecordDecl>(Specialized))
4853 EntityKind = 5;
Richard Smith1af83c42012-03-23 03:33:32 +00004854 else if (isa<EnumDecl>(Specialized) && S.getLangOpts().CPlusPlus0x)
4855 EntityKind = 6;
Douglas Gregord5cb8762009-10-07 00:13:32 +00004856 else {
Richard Smith1af83c42012-03-23 03:33:32 +00004857 S.Diag(Loc, diag::err_template_spec_unknown_kind)
4858 << S.getLangOpts().CPlusPlus0x;
Douglas Gregor9302da62009-10-14 23:50:59 +00004859 S.Diag(Specialized->getLocation(), diag::note_specialized_entity);
Douglas Gregord5cb8762009-10-07 00:13:32 +00004860 return true;
4861 }
4862
Douglas Gregor88b70942009-02-25 22:02:03 +00004863 // C++ [temp.expl.spec]p2:
4864 // An explicit specialization shall be declared in the namespace
4865 // of which the template is a member, or, for member templates, in
4866 // the namespace of which the enclosing class or enclosing class
4867 // template is a member. An explicit specialization of a member
4868 // function, member class or static data member of a class
4869 // template shall be declared in the namespace of which the class
4870 // template is a member. Such a declaration may also be a
4871 // definition. If the declaration is not a definition, the
4872 // specialization may be defined later in the name- space in which
4873 // the explicit specialization was declared, or in a namespace
4874 // that encloses the one in which the explicit specialization was
4875 // declared.
Sebastian Redl7a126a42010-08-31 00:36:30 +00004876 if (S.CurContext->getRedeclContext()->isFunctionOrMethod()) {
Douglas Gregord5cb8762009-10-07 00:13:32 +00004877 S.Diag(Loc, diag::err_template_spec_decl_function_scope)
Douglas Gregor9302da62009-10-14 23:50:59 +00004878 << Specialized;
Douglas Gregor88b70942009-02-25 22:02:03 +00004879 return true;
4880 }
Douglas Gregor7974c3b2009-10-07 17:21:34 +00004881
Douglas Gregor0a407472009-10-07 17:30:37 +00004882 if (S.CurContext->isRecord() && !IsPartialSpecialization) {
David Blaikie4e4d0842012-03-11 07:00:24 +00004883 if (S.getLangOpts().MicrosoftExt) {
Francois Pichetaf0f4d02011-08-14 03:52:19 +00004884 // Do not warn for class scope explicit specialization during
4885 // instantiation, warning was already emitted during pattern
4886 // semantic analysis.
4887 if (!S.ActiveTemplateInstantiations.size())
4888 S.Diag(Loc, diag::ext_function_specialization_in_class)
4889 << Specialized;
4890 } else {
4891 S.Diag(Loc, diag::err_template_spec_decl_class_scope)
4892 << Specialized;
4893 return true;
4894 }
Douglas Gregor0a407472009-10-07 17:30:37 +00004895 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004896
Douglas Gregor8e0c1182011-10-20 16:41:18 +00004897 if (S.CurContext->isRecord() &&
4898 !S.CurContext->Equals(Specialized->getDeclContext())) {
4899 // Make sure that we're specializing in the right record context.
4900 // Otherwise, things can go horribly wrong.
4901 S.Diag(Loc, diag::err_template_spec_decl_class_scope)
4902 << Specialized;
4903 return true;
4904 }
4905
Douglas Gregor7974c3b2009-10-07 17:21:34 +00004906 // C++ [temp.class.spec]p6:
4907 // A class template partial specialization may be declared or redeclared
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004908 // in any namespace scope in which its definition may be defined (14.5.1
4909 // and 14.5.2).
Douglas Gregord5cb8762009-10-07 00:13:32 +00004910 bool ComplainedAboutScope = false;
Douglas Gregor8e0c1182011-10-20 16:41:18 +00004911 DeclContext *SpecializedContext
Douglas Gregord5cb8762009-10-07 00:13:32 +00004912 = Specialized->getDeclContext()->getEnclosingNamespaceContext();
Douglas Gregor7974c3b2009-10-07 17:21:34 +00004913 DeclContext *DC = S.CurContext->getEnclosingNamespaceContext();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004914 if ((!PrevDecl ||
Douglas Gregor9302da62009-10-14 23:50:59 +00004915 getTemplateSpecializationKind(PrevDecl) == TSK_Undeclared ||
4916 getTemplateSpecializationKind(PrevDecl) == TSK_ImplicitInstantiation)){
Douglas Gregor121dc9a2010-09-12 05:08:28 +00004917 // C++ [temp.exp.spec]p2:
4918 // An explicit specialization shall be declared in the namespace of which
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004919 // the template is a member, or, for member templates, in the namespace
Douglas Gregor121dc9a2010-09-12 05:08:28 +00004920 // of which the enclosing class or enclosing class template is a member.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004921 // An explicit specialization of a member function, member class or
4922 // static data member of a class template shall be declared in the
Douglas Gregor121dc9a2010-09-12 05:08:28 +00004923 // namespace of which the class template is a member.
4924 //
4925 // C++0x [temp.expl.spec]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004926 // An explicit specialization shall be declared in a namespace enclosing
Douglas Gregor121dc9a2010-09-12 05:08:28 +00004927 // the specialized template.
Richard Smithebaf0e62011-10-18 20:49:44 +00004928 if (!DC->InEnclosingNamespaceSetOf(SpecializedContext)) {
4929 bool IsCPlusPlus0xExtension = DC->Encloses(SpecializedContext);
4930 if (isa<TranslationUnitDecl>(SpecializedContext)) {
4931 assert(!IsCPlusPlus0xExtension &&
4932 "DC encloses TU but isn't in enclosing namespace set");
4933 S.Diag(Loc, diag::err_template_spec_decl_out_of_scope_global)
Douglas Gregora4d5de52010-09-12 05:24:55 +00004934 << EntityKind << Specialized;
Richard Smithebaf0e62011-10-18 20:49:44 +00004935 } else if (isa<NamespaceDecl>(SpecializedContext)) {
4936 int Diag;
4937 if (!IsCPlusPlus0xExtension)
4938 Diag = diag::err_template_spec_decl_out_of_scope;
David Blaikie4e4d0842012-03-11 07:00:24 +00004939 else if (!S.getLangOpts().CPlusPlus0x)
Richard Smithebaf0e62011-10-18 20:49:44 +00004940 Diag = diag::ext_template_spec_decl_out_of_scope;
4941 else
4942 Diag = diag::warn_cxx98_compat_template_spec_decl_out_of_scope;
4943 S.Diag(Loc, Diag)
4944 << EntityKind << Specialized << cast<NamedDecl>(SpecializedContext);
4945 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004946
Douglas Gregor9302da62009-10-14 23:50:59 +00004947 S.Diag(Specialized->getLocation(), diag::note_specialized_entity);
Richard Smithebaf0e62011-10-18 20:49:44 +00004948 ComplainedAboutScope =
David Blaikie4e4d0842012-03-11 07:00:24 +00004949 !(IsCPlusPlus0xExtension && S.getLangOpts().CPlusPlus0x);
Douglas Gregor88b70942009-02-25 22:02:03 +00004950 }
Douglas Gregor88b70942009-02-25 22:02:03 +00004951 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004952
4953 // Make sure that this redeclaration (or definition) occurs in an enclosing
Douglas Gregor9302da62009-10-14 23:50:59 +00004954 // namespace.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004955 // Note that HandleDeclarator() performs this check for explicit
Douglas Gregord5cb8762009-10-07 00:13:32 +00004956 // specializations of function templates, static data members, and member
4957 // functions, so we skip the check here for those kinds of entities.
4958 // FIXME: HandleDeclarator's diagnostics aren't quite as good, though.
Douglas Gregor7974c3b2009-10-07 17:21:34 +00004959 // Should we refactor that check, so that it occurs later?
4960 if (!ComplainedAboutScope && !DC->Encloses(SpecializedContext) &&
Douglas Gregor9302da62009-10-14 23:50:59 +00004961 !(isa<FunctionTemplateDecl>(Specialized) || isa<VarDecl>(Specialized) ||
4962 isa<FunctionDecl>(Specialized))) {
Douglas Gregord5cb8762009-10-07 00:13:32 +00004963 if (isa<TranslationUnitDecl>(SpecializedContext))
4964 S.Diag(Loc, diag::err_template_spec_redecl_global_scope)
4965 << EntityKind << Specialized;
4966 else if (isa<NamespaceDecl>(SpecializedContext))
4967 S.Diag(Loc, diag::err_template_spec_redecl_out_of_scope)
4968 << EntityKind << Specialized
4969 << cast<NamedDecl>(SpecializedContext);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004970
Douglas Gregor9302da62009-10-14 23:50:59 +00004971 S.Diag(Specialized->getLocation(), diag::note_specialized_entity);
Douglas Gregor88b70942009-02-25 22:02:03 +00004972 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004973
Douglas Gregord5cb8762009-10-07 00:13:32 +00004974 // FIXME: check for specialization-after-instantiation errors and such.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004975
Douglas Gregor88b70942009-02-25 22:02:03 +00004976 return false;
4977}
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004978
Douglas Gregorbacb9492011-01-03 21:13:47 +00004979/// \brief Subroutine of Sema::CheckClassTemplatePartialSpecializationArgs
4980/// that checks non-type template partial specialization arguments.
4981static bool CheckNonTypeClassTemplatePartialSpecializationArgs(Sema &S,
4982 NonTypeTemplateParmDecl *Param,
4983 const TemplateArgument *Args,
4984 unsigned NumArgs) {
4985 for (unsigned I = 0; I != NumArgs; ++I) {
4986 if (Args[I].getKind() == TemplateArgument::Pack) {
4987 if (CheckNonTypeClassTemplatePartialSpecializationArgs(S, Param,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004988 Args[I].pack_begin(),
Douglas Gregorbacb9492011-01-03 21:13:47 +00004989 Args[I].pack_size()))
4990 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004991
Douglas Gregore94866f2009-06-12 21:21:02 +00004992 continue;
Douglas Gregorbacb9492011-01-03 21:13:47 +00004993 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00004994
Douglas Gregorbacb9492011-01-03 21:13:47 +00004995 Expr *ArgExpr = Args[I].getAsExpr();
Douglas Gregor6aa75cf2009-06-12 22:08:06 +00004996 if (!ArgExpr) {
Douglas Gregore94866f2009-06-12 21:21:02 +00004997 continue;
Douglas Gregor6aa75cf2009-06-12 22:08:06 +00004998 }
Douglas Gregore94866f2009-06-12 21:21:02 +00004999
Douglas Gregor7a21fd42011-01-03 21:37:45 +00005000 // We can have a pack expansion of any of the bullets below.
Douglas Gregorbacb9492011-01-03 21:13:47 +00005001 if (PackExpansionExpr *Expansion = dyn_cast<PackExpansionExpr>(ArgExpr))
5002 ArgExpr = Expansion->getPattern();
Douglas Gregor54c53cc2011-01-04 23:35:54 +00005003
5004 // Strip off any implicit casts we added as part of type checking.
5005 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr))
5006 ArgExpr = ICE->getSubExpr();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005007
Douglas Gregore94866f2009-06-12 21:21:02 +00005008 // C++ [temp.class.spec]p8:
5009 // A non-type argument is non-specialized if it is the name of a
5010 // non-type parameter. All other non-type arguments are
5011 // specialized.
5012 //
5013 // Below, we check the two conditions that only apply to
5014 // specialized non-type arguments, so skip any non-specialized
5015 // arguments.
5016 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ArgExpr))
Douglas Gregor54c53cc2011-01-04 23:35:54 +00005017 if (isa<NonTypeTemplateParmDecl>(DRE->getDecl()))
Douglas Gregore94866f2009-06-12 21:21:02 +00005018 continue;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005019
Douglas Gregore94866f2009-06-12 21:21:02 +00005020 // C++ [temp.class.spec]p9:
5021 // Within the argument list of a class template partial
5022 // specialization, the following restrictions apply:
5023 // -- A partially specialized non-type argument expression
5024 // shall not involve a template parameter of the partial
5025 // specialization except when the argument expression is a
5026 // simple identifier.
5027 if (ArgExpr->isTypeDependent() || ArgExpr->isValueDependent()) {
Douglas Gregorbacb9492011-01-03 21:13:47 +00005028 S.Diag(ArgExpr->getLocStart(),
Douglas Gregore94866f2009-06-12 21:21:02 +00005029 diag::err_dependent_non_type_arg_in_partial_spec)
5030 << ArgExpr->getSourceRange();
5031 return true;
5032 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005033
Douglas Gregore94866f2009-06-12 21:21:02 +00005034 // -- The type of a template parameter corresponding to a
5035 // specialized non-type argument shall not be dependent on a
5036 // parameter of the specialization.
5037 if (Param->getType()->isDependentType()) {
Douglas Gregorbacb9492011-01-03 21:13:47 +00005038 S.Diag(ArgExpr->getLocStart(),
Douglas Gregore94866f2009-06-12 21:21:02 +00005039 diag::err_dependent_typed_non_type_arg_in_partial_spec)
5040 << Param->getType()
5041 << ArgExpr->getSourceRange();
Douglas Gregorbacb9492011-01-03 21:13:47 +00005042 S.Diag(Param->getLocation(), diag::note_template_param_here);
Douglas Gregore94866f2009-06-12 21:21:02 +00005043 return true;
5044 }
5045 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005046
Douglas Gregorbacb9492011-01-03 21:13:47 +00005047 return false;
5048}
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005049
Douglas Gregorbacb9492011-01-03 21:13:47 +00005050/// \brief Check the non-type template arguments of a class template
5051/// partial specialization according to C++ [temp.class.spec]p9.
5052///
5053/// \param TemplateParams the template parameters of the primary class
5054/// template.
5055///
5056/// \param TemplateArg the template arguments of the class template
5057/// partial specialization.
5058///
5059/// \returns true if there was an error, false otherwise.
5060static bool CheckClassTemplatePartialSpecializationArgs(Sema &S,
5061 TemplateParameterList *TemplateParams,
Chris Lattner5f9e2722011-07-23 10:55:15 +00005062 SmallVectorImpl<TemplateArgument> &TemplateArgs) {
Douglas Gregorbacb9492011-01-03 21:13:47 +00005063 const TemplateArgument *ArgList = TemplateArgs.data();
5064
5065 for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) {
5066 NonTypeTemplateParmDecl *Param
5067 = dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(I));
5068 if (!Param)
5069 continue;
5070
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005071 if (CheckNonTypeClassTemplatePartialSpecializationArgs(S, Param,
Douglas Gregorbacb9492011-01-03 21:13:47 +00005072 &ArgList[I], 1))
5073 return true;
5074 }
Douglas Gregore94866f2009-06-12 21:21:02 +00005075
5076 return false;
5077}
5078
John McCalld226f652010-08-21 09:40:31 +00005079DeclResult
John McCall0f434ec2009-07-31 02:45:11 +00005080Sema::ActOnClassTemplateSpecialization(Scope *S, unsigned TagSpec,
5081 TagUseKind TUK,
Mike Stump1eb44332009-09-09 15:08:12 +00005082 SourceLocation KWLoc,
Douglas Gregord023aec2011-09-09 20:53:38 +00005083 SourceLocation ModulePrivateLoc,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00005084 CXXScopeSpec &SS,
Douglas Gregor7532dc62009-03-30 22:58:21 +00005085 TemplateTy TemplateD,
Douglas Gregorcc636682009-02-17 23:15:12 +00005086 SourceLocation TemplateNameLoc,
5087 SourceLocation LAngleLoc,
Douglas Gregor40808ce2009-03-09 23:48:35 +00005088 ASTTemplateArgsPtr TemplateArgsIn,
Douglas Gregorcc636682009-02-17 23:15:12 +00005089 SourceLocation RAngleLoc,
5090 AttributeList *Attr,
5091 MultiTemplateParamsArg TemplateParameterLists) {
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005092 assert(TUK != TUK_Reference && "References are not specializations");
John McCallf1bbbb42009-09-04 01:14:41 +00005093
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005094 // NOTE: KWLoc is the location of the tag keyword. This will instead
5095 // store the location of the outermost template keyword in the declaration.
5096 SourceLocation TemplateKWLoc = TemplateParameterLists.size() > 0
5097 ? TemplateParameterLists.get()[0]->getTemplateLoc() : SourceLocation();
5098
Douglas Gregorcc636682009-02-17 23:15:12 +00005099 // Find the class template we're specializing
Douglas Gregor7532dc62009-03-30 22:58:21 +00005100 TemplateName Name = TemplateD.getAsVal<TemplateName>();
Mike Stump1eb44332009-09-09 15:08:12 +00005101 ClassTemplateDecl *ClassTemplate
Douglas Gregor8b13c082009-11-12 00:46:20 +00005102 = dyn_cast_or_null<ClassTemplateDecl>(Name.getAsTemplateDecl());
5103
5104 if (!ClassTemplate) {
5105 Diag(TemplateNameLoc, diag::err_not_class_template_specialization)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005106 << (Name.getAsTemplateDecl() &&
Douglas Gregor8b13c082009-11-12 00:46:20 +00005107 isa<TemplateTemplateParmDecl>(Name.getAsTemplateDecl()));
5108 return true;
5109 }
Douglas Gregorcc636682009-02-17 23:15:12 +00005110
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005111 bool isExplicitSpecialization = false;
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005112 bool isPartialSpecialization = false;
5113
Douglas Gregor88b70942009-02-25 22:02:03 +00005114 // Check the validity of the template headers that introduce this
5115 // template.
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005116 // FIXME: We probably shouldn't complain about these headers for
5117 // friend declarations.
Douglas Gregor0167f3c2010-07-14 23:14:12 +00005118 bool Invalid = false;
Douglas Gregor05396e22009-08-25 17:23:04 +00005119 TemplateParameterList *TemplateParams
Douglas Gregorc8406492011-05-10 18:27:06 +00005120 = MatchTemplateParametersToScopeSpecifier(TemplateNameLoc,
5121 TemplateNameLoc,
5122 SS,
Mike Stump1eb44332009-09-09 15:08:12 +00005123 (TemplateParameterList**)TemplateParameterLists.get(),
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005124 TemplateParameterLists.size(),
John McCall77e8b112010-04-13 20:37:33 +00005125 TUK == TUK_Friend,
Douglas Gregor0167f3c2010-07-14 23:14:12 +00005126 isExplicitSpecialization,
5127 Invalid);
5128 if (Invalid)
5129 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005130
Douglas Gregor05396e22009-08-25 17:23:04 +00005131 if (TemplateParams && TemplateParams->size() > 0) {
5132 isPartialSpecialization = true;
Douglas Gregor88b70942009-02-25 22:02:03 +00005133
Douglas Gregorb0ee93c2010-12-21 08:14:57 +00005134 if (TUK == TUK_Friend) {
5135 Diag(KWLoc, diag::err_partial_specialization_friend)
5136 << SourceRange(LAngleLoc, RAngleLoc);
5137 return true;
5138 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005139
Douglas Gregor05396e22009-08-25 17:23:04 +00005140 // C++ [temp.class.spec]p10:
5141 // The template parameter list of a specialization shall not
5142 // contain default template argument values.
5143 for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) {
5144 Decl *Param = TemplateParams->getParam(I);
5145 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
5146 if (TTP->hasDefaultArgument()) {
Mike Stump1eb44332009-09-09 15:08:12 +00005147 Diag(TTP->getDefaultArgumentLoc(),
Douglas Gregor05396e22009-08-25 17:23:04 +00005148 diag::err_default_arg_in_partial_spec);
John McCall833ca992009-10-29 08:12:44 +00005149 TTP->removeDefaultArgument();
Douglas Gregor05396e22009-08-25 17:23:04 +00005150 }
5151 } else if (NonTypeTemplateParmDecl *NTTP
5152 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
5153 if (Expr *DefArg = NTTP->getDefaultArgument()) {
Mike Stump1eb44332009-09-09 15:08:12 +00005154 Diag(NTTP->getDefaultArgumentLoc(),
Douglas Gregor05396e22009-08-25 17:23:04 +00005155 diag::err_default_arg_in_partial_spec)
5156 << DefArg->getSourceRange();
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00005157 NTTP->removeDefaultArgument();
Douglas Gregor05396e22009-08-25 17:23:04 +00005158 }
5159 } else {
5160 TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(Param);
Douglas Gregor788cd062009-11-11 01:00:40 +00005161 if (TTP->hasDefaultArgument()) {
5162 Diag(TTP->getDefaultArgument().getLocation(),
Douglas Gregor05396e22009-08-25 17:23:04 +00005163 diag::err_default_arg_in_partial_spec)
Douglas Gregor788cd062009-11-11 01:00:40 +00005164 << TTP->getDefaultArgument().getSourceRange();
Abramo Bagnarad92f7a22010-06-09 09:26:05 +00005165 TTP->removeDefaultArgument();
Douglas Gregorba1ecb52009-06-12 19:43:02 +00005166 }
5167 }
5168 }
Douglas Gregora735b202009-10-13 14:39:41 +00005169 } else if (TemplateParams) {
5170 if (TUK == TUK_Friend)
5171 Diag(KWLoc, diag::err_template_spec_friend)
Douglas Gregor849b2432010-03-31 17:46:05 +00005172 << FixItHint::CreateRemoval(
Douglas Gregora735b202009-10-13 14:39:41 +00005173 SourceRange(TemplateParams->getTemplateLoc(),
5174 TemplateParams->getRAngleLoc()))
5175 << SourceRange(LAngleLoc, RAngleLoc);
5176 else
5177 isExplicitSpecialization = true;
5178 } else if (TUK != TUK_Friend) {
Douglas Gregor05396e22009-08-25 17:23:04 +00005179 Diag(KWLoc, diag::err_template_spec_needs_header)
Douglas Gregor849b2432010-03-31 17:46:05 +00005180 << FixItHint::CreateInsertion(KWLoc, "template<> ");
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005181 isExplicitSpecialization = true;
5182 }
Douglas Gregor88b70942009-02-25 22:02:03 +00005183
Douglas Gregorcc636682009-02-17 23:15:12 +00005184 // Check that the specialization uses the same tag kind as the
5185 // original template.
Abramo Bagnara465d41b2010-05-11 21:36:43 +00005186 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
5187 assert(Kind != TTK_Enum && "Invalid enum tag in class template spec!");
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005188 if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(),
Richard Trieubbf34c02011-06-10 03:11:26 +00005189 Kind, TUK == TUK_Definition, KWLoc,
Douglas Gregor501c5ce2009-05-14 16:41:31 +00005190 *ClassTemplate->getIdentifier())) {
Mike Stump1eb44332009-09-09 15:08:12 +00005191 Diag(KWLoc, diag::err_use_with_wrong_tag)
Douglas Gregora3a83512009-04-01 23:51:29 +00005192 << ClassTemplate
Douglas Gregor849b2432010-03-31 17:46:05 +00005193 << FixItHint::CreateReplacement(KWLoc,
Douglas Gregora3a83512009-04-01 23:51:29 +00005194 ClassTemplate->getTemplatedDecl()->getKindName());
Mike Stump1eb44332009-09-09 15:08:12 +00005195 Diag(ClassTemplate->getTemplatedDecl()->getLocation(),
Douglas Gregorcc636682009-02-17 23:15:12 +00005196 diag::note_previous_use);
5197 Kind = ClassTemplate->getTemplatedDecl()->getTagKind();
5198 }
5199
Douglas Gregor40808ce2009-03-09 23:48:35 +00005200 // Translate the parser's template argument list in our AST format.
John McCalld5532b62009-11-23 01:53:49 +00005201 TemplateArgumentListInfo TemplateArgs;
5202 TemplateArgs.setLAngleLoc(LAngleLoc);
5203 TemplateArgs.setRAngleLoc(RAngleLoc);
Douglas Gregor314b97f2009-11-10 19:49:08 +00005204 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
Douglas Gregor40808ce2009-03-09 23:48:35 +00005205
Douglas Gregor925910d2011-01-03 20:35:03 +00005206 // Check for unexpanded parameter packs in any of the template arguments.
5207 for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005208 if (DiagnoseUnexpandedParameterPack(TemplateArgs[I],
Douglas Gregor925910d2011-01-03 20:35:03 +00005209 UPPC_PartialSpecialization))
5210 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005211
Douglas Gregorcc636682009-02-17 23:15:12 +00005212 // Check that the template argument list is well-formed for this
5213 // template.
Chris Lattner5f9e2722011-07-23 10:55:15 +00005214 SmallVector<TemplateArgument, 4> Converted;
John McCalld5532b62009-11-23 01:53:49 +00005215 if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc,
5216 TemplateArgs, false, Converted))
Douglas Gregor212e81c2009-03-25 00:13:59 +00005217 return true;
Douglas Gregorcc636682009-02-17 23:15:12 +00005218
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005219 // Find the class template (partial) specialization declaration that
Douglas Gregorcc636682009-02-17 23:15:12 +00005220 // corresponds to these arguments.
Douglas Gregorba1ecb52009-06-12 19:43:02 +00005221 if (isPartialSpecialization) {
Douglas Gregorbacb9492011-01-03 21:13:47 +00005222 if (CheckClassTemplatePartialSpecializationArgs(*this,
Douglas Gregore94866f2009-06-12 21:21:02 +00005223 ClassTemplate->getTemplateParameters(),
Douglas Gregorb9c66312010-12-23 17:13:55 +00005224 Converted))
Douglas Gregore94866f2009-06-12 21:21:02 +00005225 return true;
5226
Douglas Gregor561f8122011-07-01 01:22:09 +00005227 bool InstantiationDependent;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005228 if (!Name.isDependent() &&
Douglas Gregorde090962010-02-09 00:37:32 +00005229 !TemplateSpecializationType::anyDependentTemplateArguments(
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005230 TemplateArgs.getArgumentArray(),
Douglas Gregor561f8122011-07-01 01:22:09 +00005231 TemplateArgs.size(),
5232 InstantiationDependent)) {
Douglas Gregorde090962010-02-09 00:37:32 +00005233 Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized)
5234 << ClassTemplate->getDeclName();
5235 isPartialSpecialization = false;
Douglas Gregorde090962010-02-09 00:37:32 +00005236 }
5237 }
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005238
Douglas Gregorcc636682009-02-17 23:15:12 +00005239 void *InsertPos = 0;
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005240 ClassTemplateSpecializationDecl *PrevDecl = 0;
5241
5242 if (isPartialSpecialization)
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005243 // FIXME: Template parameter list matters, too
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005244 PrevDecl
Douglas Gregor910f8002010-11-07 23:05:16 +00005245 = ClassTemplate->findPartialSpecialization(Converted.data(),
5246 Converted.size(),
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005247 InsertPos);
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005248 else
5249 PrevDecl
Douglas Gregor910f8002010-11-07 23:05:16 +00005250 = ClassTemplate->findSpecialization(Converted.data(),
5251 Converted.size(), InsertPos);
Douglas Gregorcc636682009-02-17 23:15:12 +00005252
5253 ClassTemplateSpecializationDecl *Specialization = 0;
5254
Douglas Gregor88b70942009-02-25 22:02:03 +00005255 // Check whether we can declare a class template specialization in
5256 // the current scope.
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005257 if (TUK != TUK_Friend &&
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005258 CheckTemplateSpecializationScope(*this, ClassTemplate, PrevDecl,
5259 TemplateNameLoc,
Douglas Gregor9302da62009-10-14 23:50:59 +00005260 isPartialSpecialization))
Douglas Gregor212e81c2009-03-25 00:13:59 +00005261 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005262
Douglas Gregorb88e8882009-07-30 17:40:51 +00005263 // The canonical type
5264 QualType CanonType;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005265 if (PrevDecl &&
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005266 (PrevDecl->getSpecializationKind() == TSK_Undeclared ||
Douglas Gregorde090962010-02-09 00:37:32 +00005267 TUK == TUK_Friend)) {
Douglas Gregorcc636682009-02-17 23:15:12 +00005268 // Since the only prior class template specialization with these
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005269 // arguments was referenced but not declared, or we're only
5270 // referencing this specialization as a friend, reuse that
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005271 // declaration node as our own, updating its source location and
5272 // the list of outer template parameters to reflect our new declaration.
Douglas Gregorcc636682009-02-17 23:15:12 +00005273 Specialization = PrevDecl;
Douglas Gregor6bc9f7e2009-02-25 22:18:32 +00005274 Specialization->setLocation(TemplateNameLoc);
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005275 if (TemplateParameterLists.size() > 0) {
5276 Specialization->setTemplateParameterListsInfo(Context,
5277 TemplateParameterLists.size(),
5278 (TemplateParameterList**) TemplateParameterLists.release());
5279 }
Douglas Gregorcc636682009-02-17 23:15:12 +00005280 PrevDecl = 0;
Douglas Gregorb88e8882009-07-30 17:40:51 +00005281 CanonType = Context.getTypeDeclType(Specialization);
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005282 } else if (isPartialSpecialization) {
Douglas Gregorb88e8882009-07-30 17:40:51 +00005283 // Build the canonical type that describes the converted template
5284 // arguments of the class template partial specialization.
Douglas Gregorde090962010-02-09 00:37:32 +00005285 TemplateName CanonTemplate = Context.getCanonicalTemplateName(Name);
5286 CanonType = Context.getTemplateSpecializationType(CanonTemplate,
Douglas Gregorb9c66312010-12-23 17:13:55 +00005287 Converted.data(),
5288 Converted.size());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005289
5290 if (Context.hasSameType(CanonType,
Douglas Gregorb9c66312010-12-23 17:13:55 +00005291 ClassTemplate->getInjectedClassNameSpecialization())) {
5292 // C++ [temp.class.spec]p9b3:
5293 //
5294 // -- The argument list of the specialization shall not be identical
5295 // to the implicit argument list of the primary template.
5296 Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template)
Douglas Gregor8d267c52011-09-09 02:06:17 +00005297 << (TUK == TUK_Definition)
5298 << FixItHint::CreateRemoval(SourceRange(LAngleLoc, RAngleLoc));
Douglas Gregorb9c66312010-12-23 17:13:55 +00005299 return CheckClassTemplate(S, TagSpec, TUK, KWLoc, SS,
5300 ClassTemplate->getIdentifier(),
5301 TemplateNameLoc,
5302 Attr,
5303 TemplateParams,
Douglas Gregore7612302011-09-09 19:05:14 +00005304 AS_none, /*ModulePrivateLoc=*/SourceLocation(),
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005305 TemplateParameterLists.size() - 1,
Abramo Bagnarac57c17d2011-03-10 13:28:31 +00005306 (TemplateParameterList**) TemplateParameterLists.release());
Douglas Gregorb9c66312010-12-23 17:13:55 +00005307 }
Douglas Gregorb88e8882009-07-30 17:40:51 +00005308
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005309 // Create a new class template partial specialization declaration node.
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005310 ClassTemplatePartialSpecializationDecl *PrevPartial
5311 = cast_or_null<ClassTemplatePartialSpecializationDecl>(PrevDecl);
Douglas Gregordc60c1e2010-04-30 05:56:50 +00005312 unsigned SequenceNumber = PrevPartial? PrevPartial->getSequenceNumber()
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005313 : ClassTemplate->getNextPartialSpecSequenceNumber();
Mike Stump1eb44332009-09-09 15:08:12 +00005314 ClassTemplatePartialSpecializationDecl *Partial
Douglas Gregor13c85772010-05-06 00:28:52 +00005315 = ClassTemplatePartialSpecializationDecl::Create(Context, Kind,
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005316 ClassTemplate->getDeclContext(),
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00005317 KWLoc, TemplateNameLoc,
Anders Carlsson91fdf6f2009-06-05 04:06:48 +00005318 TemplateParams,
5319 ClassTemplate,
Douglas Gregor910f8002010-11-07 23:05:16 +00005320 Converted.data(),
5321 Converted.size(),
John McCalld5532b62009-11-23 01:53:49 +00005322 TemplateArgs,
John McCall3cb0ebd2010-03-10 03:28:59 +00005323 CanonType,
Douglas Gregordc60c1e2010-04-30 05:56:50 +00005324 PrevPartial,
5325 SequenceNumber);
John McCallb6217662010-03-15 10:12:16 +00005326 SetNestedNameSpecifier(Partial, SS);
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005327 if (TemplateParameterLists.size() > 1 && SS.isSet()) {
Douglas Gregorc722ea42010-06-15 17:44:38 +00005328 Partial->setTemplateParameterListsInfo(Context,
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005329 TemplateParameterLists.size() - 1,
Abramo Bagnara9b934882010-06-12 08:15:14 +00005330 (TemplateParameterList**) TemplateParameterLists.release());
5331 }
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005332
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005333 if (!PrevPartial)
5334 ClassTemplate->AddPartialSpecialization(Partial, InsertPos);
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005335 Specialization = Partial;
Douglas Gregor031a5882009-06-13 00:26:55 +00005336
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005337 // If we are providing an explicit specialization of a member class
Douglas Gregored9c0f92009-10-29 00:04:11 +00005338 // template specialization, make a note of that.
5339 if (PrevPartial && PrevPartial->getInstantiatedFromMember())
5340 PrevPartial->setMemberSpecialization();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005341
Douglas Gregor031a5882009-06-13 00:26:55 +00005342 // Check that all of the template parameters of the class template
5343 // partial specialization are deducible from the template
5344 // arguments. If not, this class template partial specialization
5345 // will never be used.
Benjamin Kramer013b3662012-01-30 16:17:39 +00005346 llvm::SmallBitVector DeducibleParams(TemplateParams->size());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005347 MarkUsedTemplateParameters(Partial->getTemplateArgs(), true,
Douglas Gregored9c0f92009-10-29 00:04:11 +00005348 TemplateParams->getDepth(),
Douglas Gregore73bb602009-09-14 21:25:05 +00005349 DeducibleParams);
Douglas Gregor031a5882009-06-13 00:26:55 +00005350
Benjamin Kramer013b3662012-01-30 16:17:39 +00005351 if (!DeducibleParams.all()) {
5352 unsigned NumNonDeducible = DeducibleParams.size()-DeducibleParams.count();
Douglas Gregor031a5882009-06-13 00:26:55 +00005353 Diag(TemplateNameLoc, diag::warn_partial_specs_not_deducible)
5354 << (NumNonDeducible > 1)
5355 << SourceRange(TemplateNameLoc, RAngleLoc);
5356 for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I) {
5357 if (!DeducibleParams[I]) {
5358 NamedDecl *Param = cast<NamedDecl>(TemplateParams->getParam(I));
5359 if (Param->getDeclName())
Mike Stump1eb44332009-09-09 15:08:12 +00005360 Diag(Param->getLocation(),
Douglas Gregor031a5882009-06-13 00:26:55 +00005361 diag::note_partial_spec_unused_parameter)
5362 << Param->getDeclName();
5363 else
Mike Stump1eb44332009-09-09 15:08:12 +00005364 Diag(Param->getLocation(),
Douglas Gregor031a5882009-06-13 00:26:55 +00005365 diag::note_partial_spec_unused_parameter)
Benjamin Kramer476d8b82010-08-11 14:47:12 +00005366 << "<anonymous>";
Douglas Gregor031a5882009-06-13 00:26:55 +00005367 }
5368 }
5369 }
Douglas Gregorcc636682009-02-17 23:15:12 +00005370 } else {
5371 // Create a new class template specialization declaration node for
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005372 // this explicit specialization or friend declaration.
Douglas Gregorcc636682009-02-17 23:15:12 +00005373 Specialization
Douglas Gregor13c85772010-05-06 00:28:52 +00005374 = ClassTemplateSpecializationDecl::Create(Context, Kind,
Douglas Gregorcc636682009-02-17 23:15:12 +00005375 ClassTemplate->getDeclContext(),
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00005376 KWLoc, TemplateNameLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00005377 ClassTemplate,
Douglas Gregor910f8002010-11-07 23:05:16 +00005378 Converted.data(),
5379 Converted.size(),
Douglas Gregorcc636682009-02-17 23:15:12 +00005380 PrevDecl);
John McCallb6217662010-03-15 10:12:16 +00005381 SetNestedNameSpecifier(Specialization, SS);
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005382 if (TemplateParameterLists.size() > 0) {
Douglas Gregorc722ea42010-06-15 17:44:38 +00005383 Specialization->setTemplateParameterListsInfo(Context,
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005384 TemplateParameterLists.size(),
Abramo Bagnara9b934882010-06-12 08:15:14 +00005385 (TemplateParameterList**) TemplateParameterLists.release());
5386 }
Douglas Gregorcc636682009-02-17 23:15:12 +00005387
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00005388 if (!PrevDecl)
5389 ClassTemplate->AddSpecialization(Specialization, InsertPos);
Douglas Gregorb88e8882009-07-30 17:40:51 +00005390
5391 CanonType = Context.getTypeDeclType(Specialization);
Douglas Gregorcc636682009-02-17 23:15:12 +00005392 }
5393
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005394 // C++ [temp.expl.spec]p6:
5395 // If a template, a member template or the member of a class template is
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005396 // explicitly specialized then that specialization shall be declared
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005397 // before the first use of that specialization that would cause an implicit
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005398 // instantiation to take place, in every translation unit in which such a
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005399 // use occurs; no diagnostic is required.
5400 if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) {
Douglas Gregordc0a11c2010-02-26 06:03:23 +00005401 bool Okay = false;
Douglas Gregorf785a7d2012-01-14 15:55:47 +00005402 for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) {
Douglas Gregordc0a11c2010-02-26 06:03:23 +00005403 // Is there any previous explicit specialization declaration?
5404 if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) {
5405 Okay = true;
5406 break;
5407 }
5408 }
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005409
Douglas Gregordc0a11c2010-02-26 06:03:23 +00005410 if (!Okay) {
5411 SourceRange Range(TemplateNameLoc, RAngleLoc);
5412 Diag(TemplateNameLoc, diag::err_specialization_after_instantiation)
5413 << Context.getTypeDeclType(Specialization) << Range;
5414
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005415 Diag(PrevDecl->getPointOfInstantiation(),
Douglas Gregordc0a11c2010-02-26 06:03:23 +00005416 diag::note_instantiation_required_here)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005417 << (PrevDecl->getTemplateSpecializationKind()
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005418 != TSK_ImplicitInstantiation);
Douglas Gregordc0a11c2010-02-26 06:03:23 +00005419 return true;
5420 }
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005421 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005422
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005423 // If this is not a friend, note that this is an explicit specialization.
5424 if (TUK != TUK_Friend)
5425 Specialization->setSpecializationKind(TSK_ExplicitSpecialization);
Douglas Gregorcc636682009-02-17 23:15:12 +00005426
5427 // Check that this isn't a redefinition of this specialization.
John McCall0f434ec2009-07-31 02:45:11 +00005428 if (TUK == TUK_Definition) {
Douglas Gregor952b0172010-02-11 01:04:33 +00005429 if (RecordDecl *Def = Specialization->getDefinition()) {
Douglas Gregorcc636682009-02-17 23:15:12 +00005430 SourceRange Range(TemplateNameLoc, RAngleLoc);
Mike Stump1eb44332009-09-09 15:08:12 +00005431 Diag(TemplateNameLoc, diag::err_redefinition)
Douglas Gregorc8ab2562009-05-31 09:31:02 +00005432 << Context.getTypeDeclType(Specialization) << Range;
Douglas Gregorcc636682009-02-17 23:15:12 +00005433 Diag(Def->getLocation(), diag::note_previous_definition);
5434 Specialization->setInvalidDecl();
Douglas Gregor212e81c2009-03-25 00:13:59 +00005435 return true;
Douglas Gregorcc636682009-02-17 23:15:12 +00005436 }
5437 }
5438
John McCall7f1b9872010-12-18 03:30:47 +00005439 if (Attr)
5440 ProcessDeclAttributeList(S, Specialization, Attr);
5441
Douglas Gregord023aec2011-09-09 20:53:38 +00005442 if (ModulePrivateLoc.isValid())
5443 Diag(Specialization->getLocation(), diag::err_module_private_specialization)
5444 << (isPartialSpecialization? 1 : 0)
5445 << FixItHint::CreateRemoval(ModulePrivateLoc);
5446
Douglas Gregorfc705b82009-02-26 22:19:44 +00005447 // Build the fully-sugared type for this class template
5448 // specialization as the user wrote in the specialization
5449 // itself. This means that we'll pretty-print the type retrieved
5450 // from the specialization's declaration the way that the user
5451 // actually wrote the specialization, rather than formatting the
5452 // name based on the "canonical" representation used to store the
5453 // template arguments in the specialization.
John McCall3cb0ebd2010-03-10 03:28:59 +00005454 TypeSourceInfo *WrittenTy
5455 = Context.getTemplateSpecializationTypeInfo(Name, TemplateNameLoc,
5456 TemplateArgs, CanonType);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005457 if (TUK != TUK_Friend) {
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005458 Specialization->setTypeAsWritten(WrittenTy);
Abramo Bagnara7f0a9152011-03-18 15:16:37 +00005459 Specialization->setTemplateKeywordLoc(TemplateKWLoc);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005460 }
Douglas Gregor40808ce2009-03-09 23:48:35 +00005461 TemplateArgsIn.release();
Douglas Gregorcc636682009-02-17 23:15:12 +00005462
Douglas Gregor6bc9f7e2009-02-25 22:18:32 +00005463 // C++ [temp.expl.spec]p9:
5464 // A template explicit specialization is in the scope of the
5465 // namespace in which the template was defined.
5466 //
5467 // We actually implement this paragraph where we set the semantic
5468 // context (in the creation of the ClassTemplateSpecializationDecl),
5469 // but we also maintain the lexical context where the actual
5470 // definition occurs.
Douglas Gregorcc636682009-02-17 23:15:12 +00005471 Specialization->setLexicalDeclContext(CurContext);
Mike Stump1eb44332009-09-09 15:08:12 +00005472
Douglas Gregorcc636682009-02-17 23:15:12 +00005473 // We may be starting the definition of this specialization.
John McCall0f434ec2009-07-31 02:45:11 +00005474 if (TUK == TUK_Definition)
Douglas Gregorcc636682009-02-17 23:15:12 +00005475 Specialization->startDefinition();
5476
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005477 if (TUK == TUK_Friend) {
5478 FriendDecl *Friend = FriendDecl::Create(Context, CurContext,
5479 TemplateNameLoc,
John McCall32f2fb52010-03-25 18:04:51 +00005480 WrittenTy,
Douglas Gregorfc9cd612009-09-26 20:57:03 +00005481 /*FIXME:*/KWLoc);
5482 Friend->setAccess(AS_public);
5483 CurContext->addDecl(Friend);
5484 } else {
5485 // Add the specialization into its lexical context, so that it can
5486 // be seen when iterating through the list of declarations in that
5487 // context. However, specializations are not found by name lookup.
5488 CurContext->addDecl(Specialization);
5489 }
John McCalld226f652010-08-21 09:40:31 +00005490 return Specialization;
Douglas Gregorcc636682009-02-17 23:15:12 +00005491}
Douglas Gregord57959a2009-03-27 23:10:48 +00005492
John McCalld226f652010-08-21 09:40:31 +00005493Decl *Sema::ActOnTemplateDeclarator(Scope *S,
Douglas Gregore542c862009-06-23 23:11:28 +00005494 MultiTemplateParamsArg TemplateParameterLists,
John McCalld226f652010-08-21 09:40:31 +00005495 Declarator &D) {
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00005496 return HandleDeclarator(S, D, move(TemplateParameterLists));
Douglas Gregore542c862009-06-23 23:11:28 +00005497}
5498
John McCalld226f652010-08-21 09:40:31 +00005499Decl *Sema::ActOnStartOfFunctionTemplateDef(Scope *FnBodyScope,
Douglas Gregor52591bf2009-06-24 00:54:41 +00005500 MultiTemplateParamsArg TemplateParameterLists,
John McCalld226f652010-08-21 09:40:31 +00005501 Declarator &D) {
Douglas Gregor52591bf2009-06-24 00:54:41 +00005502 assert(getCurFunctionDecl() == 0 && "Function parsing confused");
Abramo Bagnara075f8f12010-12-10 16:29:40 +00005503 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
Mike Stump1eb44332009-09-09 15:08:12 +00005504
Douglas Gregor52591bf2009-06-24 00:54:41 +00005505 if (FTI.hasPrototype) {
Mike Stump1eb44332009-09-09 15:08:12 +00005506 // FIXME: Diagnose arguments without names in C.
Douglas Gregor52591bf2009-06-24 00:54:41 +00005507 }
Mike Stump1eb44332009-09-09 15:08:12 +00005508
Douglas Gregor52591bf2009-06-24 00:54:41 +00005509 Scope *ParentScope = FnBodyScope->getParent();
Mike Stump1eb44332009-09-09 15:08:12 +00005510
Douglas Gregor45fa5602011-11-07 20:56:01 +00005511 D.setFunctionDefinitionKind(FDK_Definition);
John McCalld226f652010-08-21 09:40:31 +00005512 Decl *DP = HandleDeclarator(ParentScope, D,
Kaelyn Uhrain2c712f52011-10-11 00:28:45 +00005513 move(TemplateParameterLists));
Mike Stump1eb44332009-09-09 15:08:12 +00005514 if (FunctionTemplateDecl *FunctionTemplate
John McCalld226f652010-08-21 09:40:31 +00005515 = dyn_cast_or_null<FunctionTemplateDecl>(DP))
Mike Stump1eb44332009-09-09 15:08:12 +00005516 return ActOnStartOfFunctionDef(FnBodyScope,
John McCalld226f652010-08-21 09:40:31 +00005517 FunctionTemplate->getTemplatedDecl());
5518 if (FunctionDecl *Function = dyn_cast_or_null<FunctionDecl>(DP))
5519 return ActOnStartOfFunctionDef(FnBodyScope, Function);
5520 return 0;
Douglas Gregor52591bf2009-06-24 00:54:41 +00005521}
5522
John McCall75042392010-02-11 01:33:53 +00005523/// \brief Strips various properties off an implicit instantiation
5524/// that has just been explicitly specialized.
5525static void StripImplicitInstantiation(NamedDecl *D) {
Rafael Espindola860097c2012-02-23 04:17:32 +00005526 // FIXME: "make check" is clean if the call to dropAttrs() is commented out.
Sean Huntcf807c42010-08-18 23:23:40 +00005527 D->dropAttrs();
John McCall75042392010-02-11 01:33:53 +00005528
5529 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
5530 FD->setInlineSpecified(false);
5531 }
5532}
5533
Nico Weberd1d512a2012-01-09 19:52:25 +00005534/// \brief Compute the diagnostic location for an explicit instantiation
5535// declaration or definition.
5536static SourceLocation DiagLocForExplicitInstantiation(
Douglas Gregorf785a7d2012-01-14 15:55:47 +00005537 NamedDecl* D, SourceLocation PointOfInstantiation) {
Nico Weberd1d512a2012-01-09 19:52:25 +00005538 // Explicit instantiations following a specialization have no effect and
5539 // hence no PointOfInstantiation. In that case, walk decl backwards
5540 // until a valid name loc is found.
5541 SourceLocation PrevDiagLoc = PointOfInstantiation;
Douglas Gregorf785a7d2012-01-14 15:55:47 +00005542 for (Decl *Prev = D; Prev && !PrevDiagLoc.isValid();
5543 Prev = Prev->getPreviousDecl()) {
Nico Weberd1d512a2012-01-09 19:52:25 +00005544 PrevDiagLoc = Prev->getLocation();
5545 }
5546 assert(PrevDiagLoc.isValid() &&
5547 "Explicit instantiation without point of instantiation?");
5548 return PrevDiagLoc;
5549}
5550
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005551/// \brief Diagnose cases where we have an explicit template specialization
Douglas Gregor454885e2009-10-15 15:54:05 +00005552/// before/after an explicit template instantiation, producing diagnostics
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005553/// for those cases where they are required and determining whether the
Douglas Gregor454885e2009-10-15 15:54:05 +00005554/// new specialization/instantiation will have any effect.
5555///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005556/// \param NewLoc the location of the new explicit specialization or
Douglas Gregor454885e2009-10-15 15:54:05 +00005557/// instantiation.
5558///
5559/// \param NewTSK the kind of the new explicit specialization or instantiation.
5560///
5561/// \param PrevDecl the previous declaration of the entity.
5562///
5563/// \param PrevTSK the kind of the old explicit specialization or instantiatin.
5564///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005565/// \param PrevPointOfInstantiation if valid, indicates where the previus
Douglas Gregor454885e2009-10-15 15:54:05 +00005566/// declaration was instantiated (either implicitly or explicitly).
5567///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005568/// \param HasNoEffect will be set to true to indicate that the new
Douglas Gregor454885e2009-10-15 15:54:05 +00005569/// specialization or instantiation has no effect and should be ignored.
5570///
5571/// \returns true if there was an error that should prevent the introduction of
5572/// the new declaration into the AST, false otherwise.
Douglas Gregor0d035142009-10-27 18:42:08 +00005573bool
5574Sema::CheckSpecializationInstantiationRedecl(SourceLocation NewLoc,
5575 TemplateSpecializationKind NewTSK,
5576 NamedDecl *PrevDecl,
5577 TemplateSpecializationKind PrevTSK,
5578 SourceLocation PrevPointOfInstantiation,
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005579 bool &HasNoEffect) {
5580 HasNoEffect = false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005581
Douglas Gregor454885e2009-10-15 15:54:05 +00005582 switch (NewTSK) {
5583 case TSK_Undeclared:
5584 case TSK_ImplicitInstantiation:
David Blaikieb219cfc2011-09-23 05:06:16 +00005585 llvm_unreachable("Don't check implicit instantiations here");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005586
Douglas Gregor454885e2009-10-15 15:54:05 +00005587 case TSK_ExplicitSpecialization:
5588 switch (PrevTSK) {
5589 case TSK_Undeclared:
5590 case TSK_ExplicitSpecialization:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005591 // Okay, we're just specializing something that is either already
Douglas Gregor454885e2009-10-15 15:54:05 +00005592 // explicitly specialized or has merely been mentioned without any
5593 // instantiation.
5594 return false;
5595
5596 case TSK_ImplicitInstantiation:
5597 if (PrevPointOfInstantiation.isInvalid()) {
5598 // The declaration itself has not actually been instantiated, so it is
5599 // still okay to specialize it.
John McCall75042392010-02-11 01:33:53 +00005600 StripImplicitInstantiation(PrevDecl);
Douglas Gregor454885e2009-10-15 15:54:05 +00005601 return false;
5602 }
5603 // Fall through
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005604
Douglas Gregor454885e2009-10-15 15:54:05 +00005605 case TSK_ExplicitInstantiationDeclaration:
5606 case TSK_ExplicitInstantiationDefinition:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005607 assert((PrevTSK == TSK_ImplicitInstantiation ||
5608 PrevPointOfInstantiation.isValid()) &&
Douglas Gregor454885e2009-10-15 15:54:05 +00005609 "Explicit instantiation without point of instantiation?");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005610
Douglas Gregor454885e2009-10-15 15:54:05 +00005611 // C++ [temp.expl.spec]p6:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005612 // If a template, a member template or the member of a class template
Douglas Gregor454885e2009-10-15 15:54:05 +00005613 // is explicitly specialized then that specialization shall be declared
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005614 // before the first use of that specialization that would cause an
Douglas Gregor454885e2009-10-15 15:54:05 +00005615 // implicit instantiation to take place, in every translation unit in
5616 // which such a use occurs; no diagnostic is required.
Douglas Gregorf785a7d2012-01-14 15:55:47 +00005617 for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) {
Douglas Gregordc0a11c2010-02-26 06:03:23 +00005618 // Is there any previous explicit specialization declaration?
5619 if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization)
5620 return false;
5621 }
5622
Douglas Gregor0d035142009-10-27 18:42:08 +00005623 Diag(NewLoc, diag::err_specialization_after_instantiation)
Douglas Gregor454885e2009-10-15 15:54:05 +00005624 << PrevDecl;
Douglas Gregor0d035142009-10-27 18:42:08 +00005625 Diag(PrevPointOfInstantiation, diag::note_instantiation_required_here)
Douglas Gregor454885e2009-10-15 15:54:05 +00005626 << (PrevTSK != TSK_ImplicitInstantiation);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005627
Douglas Gregor454885e2009-10-15 15:54:05 +00005628 return true;
5629 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005630
Douglas Gregor454885e2009-10-15 15:54:05 +00005631 case TSK_ExplicitInstantiationDeclaration:
5632 switch (PrevTSK) {
5633 case TSK_ExplicitInstantiationDeclaration:
5634 // This explicit instantiation declaration is redundant (that's okay).
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005635 HasNoEffect = true;
Douglas Gregor454885e2009-10-15 15:54:05 +00005636 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005637
Douglas Gregor454885e2009-10-15 15:54:05 +00005638 case TSK_Undeclared:
5639 case TSK_ImplicitInstantiation:
5640 // We're explicitly instantiating something that may have already been
5641 // implicitly instantiated; that's fine.
5642 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005643
Douglas Gregor454885e2009-10-15 15:54:05 +00005644 case TSK_ExplicitSpecialization:
5645 // C++0x [temp.explicit]p4:
5646 // For a given set of template parameters, if an explicit instantiation
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005647 // of a template appears after a declaration of an explicit
Douglas Gregor454885e2009-10-15 15:54:05 +00005648 // specialization for that template, the explicit instantiation has no
5649 // effect.
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005650 HasNoEffect = true;
Douglas Gregor454885e2009-10-15 15:54:05 +00005651 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005652
Douglas Gregor454885e2009-10-15 15:54:05 +00005653 case TSK_ExplicitInstantiationDefinition:
5654 // C++0x [temp.explicit]p10:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005655 // If an entity is the subject of both an explicit instantiation
5656 // declaration and an explicit instantiation definition in the same
Douglas Gregor454885e2009-10-15 15:54:05 +00005657 // translation unit, the definition shall follow the declaration.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005658 Diag(NewLoc,
Douglas Gregor0d035142009-10-27 18:42:08 +00005659 diag::err_explicit_instantiation_declaration_after_definition);
Nico Weberff91d242011-12-23 20:58:04 +00005660
5661 // Explicit instantiations following a specialization have no effect and
5662 // hence no PrevPointOfInstantiation. In that case, walk decl backwards
5663 // until a valid name loc is found.
Nico Weberd1d512a2012-01-09 19:52:25 +00005664 Diag(DiagLocForExplicitInstantiation(PrevDecl, PrevPointOfInstantiation),
5665 diag::note_explicit_instantiation_definition_here);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005666 HasNoEffect = true;
Douglas Gregor454885e2009-10-15 15:54:05 +00005667 return false;
5668 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005669
Douglas Gregor454885e2009-10-15 15:54:05 +00005670 case TSK_ExplicitInstantiationDefinition:
5671 switch (PrevTSK) {
5672 case TSK_Undeclared:
5673 case TSK_ImplicitInstantiation:
5674 // We're explicitly instantiating something that may have already been
5675 // implicitly instantiated; that's fine.
5676 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005677
Douglas Gregor454885e2009-10-15 15:54:05 +00005678 case TSK_ExplicitSpecialization:
5679 // C++ DR 259, C++0x [temp.explicit]p4:
5680 // For a given set of template parameters, if an explicit
5681 // instantiation of a template appears after a declaration of
5682 // an explicit specialization for that template, the explicit
5683 // instantiation has no effect.
5684 //
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005685 // In C++98/03 mode, we only give an extension warning here, because it
Douglas Gregorc42b6522010-04-09 21:02:29 +00005686 // is not harmful to try to explicitly instantiate something that
Douglas Gregor454885e2009-10-15 15:54:05 +00005687 // has been explicitly specialized.
David Blaikie4e4d0842012-03-11 07:00:24 +00005688 Diag(NewLoc, getLangOpts().CPlusPlus0x ?
Richard Smithebaf0e62011-10-18 20:49:44 +00005689 diag::warn_cxx98_compat_explicit_instantiation_after_specialization :
5690 diag::ext_explicit_instantiation_after_specialization)
5691 << PrevDecl;
5692 Diag(PrevDecl->getLocation(),
5693 diag::note_previous_template_specialization);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005694 HasNoEffect = true;
Douglas Gregor454885e2009-10-15 15:54:05 +00005695 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005696
Douglas Gregor454885e2009-10-15 15:54:05 +00005697 case TSK_ExplicitInstantiationDeclaration:
5698 // We're explicity instantiating a definition for something for which we
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005699 // were previously asked to suppress instantiations. That's fine.
Nico Weberff91d242011-12-23 20:58:04 +00005700
5701 // C++0x [temp.explicit]p4:
5702 // For a given set of template parameters, if an explicit instantiation
5703 // of a template appears after a declaration of an explicit
5704 // specialization for that template, the explicit instantiation has no
5705 // effect.
Douglas Gregorf785a7d2012-01-14 15:55:47 +00005706 for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) {
Nico Weberff91d242011-12-23 20:58:04 +00005707 // Is there any previous explicit specialization declaration?
5708 if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) {
5709 HasNoEffect = true;
5710 break;
5711 }
5712 }
5713
Douglas Gregor454885e2009-10-15 15:54:05 +00005714 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005715
Douglas Gregor454885e2009-10-15 15:54:05 +00005716 case TSK_ExplicitInstantiationDefinition:
5717 // C++0x [temp.spec]p5:
5718 // For a given template and a given set of template-arguments,
5719 // - an explicit instantiation definition shall appear at most once
5720 // in a program,
Douglas Gregor0d035142009-10-27 18:42:08 +00005721 Diag(NewLoc, diag::err_explicit_instantiation_duplicate)
Douglas Gregor454885e2009-10-15 15:54:05 +00005722 << PrevDecl;
Nico Weberd1d512a2012-01-09 19:52:25 +00005723 Diag(DiagLocForExplicitInstantiation(PrevDecl, PrevPointOfInstantiation),
Douglas Gregor0d035142009-10-27 18:42:08 +00005724 diag::note_previous_explicit_instantiation);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005725 HasNoEffect = true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005726 return false;
Douglas Gregor454885e2009-10-15 15:54:05 +00005727 }
Douglas Gregor454885e2009-10-15 15:54:05 +00005728 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005729
David Blaikieb219cfc2011-09-23 05:06:16 +00005730 llvm_unreachable("Missing specialization/instantiation case?");
Douglas Gregor454885e2009-10-15 15:54:05 +00005731}
5732
John McCallaf2094e2010-04-08 09:05:18 +00005733/// \brief Perform semantic analysis for the given dependent function
5734/// template specialization. The only possible way to get a dependent
5735/// function template specialization is with a friend declaration,
5736/// like so:
5737///
5738/// template <class T> void foo(T);
5739/// template <class T> class A {
5740/// friend void foo<>(T);
5741/// };
5742///
5743/// There really isn't any useful analysis we can do here, so we
5744/// just store the information.
5745bool
5746Sema::CheckDependentFunctionTemplateSpecialization(FunctionDecl *FD,
5747 const TemplateArgumentListInfo &ExplicitTemplateArgs,
5748 LookupResult &Previous) {
5749 // Remove anything from Previous that isn't a function template in
5750 // the correct context.
Sebastian Redl7a126a42010-08-31 00:36:30 +00005751 DeclContext *FDLookupContext = FD->getDeclContext()->getRedeclContext();
John McCallaf2094e2010-04-08 09:05:18 +00005752 LookupResult::Filter F = Previous.makeFilter();
5753 while (F.hasNext()) {
5754 NamedDecl *D = F.next()->getUnderlyingDecl();
5755 if (!isa<FunctionTemplateDecl>(D) ||
Sebastian Redl7a126a42010-08-31 00:36:30 +00005756 !FDLookupContext->InEnclosingNamespaceSetOf(
5757 D->getDeclContext()->getRedeclContext()))
John McCallaf2094e2010-04-08 09:05:18 +00005758 F.erase();
5759 }
5760 F.done();
5761
5762 // Should this be diagnosed here?
5763 if (Previous.empty()) return true;
5764
5765 FD->setDependentTemplateSpecialization(Context, Previous.asUnresolvedSet(),
5766 ExplicitTemplateArgs);
5767 return false;
5768}
5769
Abramo Bagnarae03db982010-05-20 15:32:11 +00005770/// \brief Perform semantic analysis for the given function template
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005771/// specialization.
5772///
Abramo Bagnarae03db982010-05-20 15:32:11 +00005773/// This routine performs all of the semantic analysis required for an
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005774/// explicit function template specialization. On successful completion,
5775/// the function declaration \p FD will become a function template
5776/// specialization.
5777///
5778/// \param FD the function declaration, which will be updated to become a
5779/// function template specialization.
5780///
Abramo Bagnarae03db982010-05-20 15:32:11 +00005781/// \param ExplicitTemplateArgs the explicitly-provided template arguments,
5782/// if any. Note that this may be valid info even when 0 arguments are
5783/// explicitly provided as in, e.g., \c void sort<>(char*, char*);
5784/// as it anyway contains info on the angle brackets locations.
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005785///
Francois Pichet59e7c562011-07-08 06:21:47 +00005786/// \param Previous the set of declarations that may be specialized by
Abramo Bagnarae03db982010-05-20 15:32:11 +00005787/// this function specialization.
5788bool
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005789Sema::CheckFunctionTemplateSpecialization(FunctionDecl *FD,
Douglas Gregor67714232011-03-03 02:41:12 +00005790 TemplateArgumentListInfo *ExplicitTemplateArgs,
John McCall68263142009-11-18 22:49:29 +00005791 LookupResult &Previous) {
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005792 // The set of function template specializations that could match this
5793 // explicit function template specialization.
John McCallc373d482010-01-27 01:50:18 +00005794 UnresolvedSet<8> Candidates;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005795
Sebastian Redl7a126a42010-08-31 00:36:30 +00005796 DeclContext *FDLookupContext = FD->getDeclContext()->getRedeclContext();
John McCall68263142009-11-18 22:49:29 +00005797 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
5798 I != E; ++I) {
5799 NamedDecl *Ovl = (*I)->getUnderlyingDecl();
5800 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Ovl)) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005801 // Only consider templates found within the same semantic lookup scope as
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005802 // FD.
Sebastian Redl7a126a42010-08-31 00:36:30 +00005803 if (!FDLookupContext->InEnclosingNamespaceSetOf(
5804 Ovl->getDeclContext()->getRedeclContext()))
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005805 continue;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005806
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005807 // C++ [temp.expl.spec]p11:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005808 // A trailing template-argument can be left unspecified in the
5809 // template-id naming an explicit function template specialization
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005810 // provided it can be deduced from the function argument type.
5811 // Perform template argument deduction to determine whether we may be
5812 // specializing this template.
5813 // FIXME: It is somewhat wasteful to build
John McCall5769d612010-02-08 23:07:23 +00005814 TemplateDeductionInfo Info(Context, FD->getLocation());
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005815 FunctionDecl *Specialization = 0;
5816 if (TemplateDeductionResult TDK
John McCalld5532b62009-11-23 01:53:49 +00005817 = DeduceTemplateArguments(FunTmpl, ExplicitTemplateArgs,
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005818 FD->getType(),
5819 Specialization,
5820 Info)) {
5821 // FIXME: Template argument deduction failed; record why it failed, so
5822 // that we can provide nifty diagnostics.
5823 (void)TDK;
5824 continue;
5825 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005826
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005827 // Record this candidate.
John McCallc373d482010-01-27 01:50:18 +00005828 Candidates.addDecl(Specialization, I.getAccess());
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005829 }
5830 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005831
Douglas Gregorc5df30f2009-09-26 03:41:46 +00005832 // Find the most specialized function template.
John McCallc373d482010-01-27 01:50:18 +00005833 UnresolvedSetIterator Result
5834 = getMostSpecialized(Candidates.begin(), Candidates.end(),
Douglas Gregor5c7bf422011-01-11 17:34:58 +00005835 TPOC_Other, 0, FD->getLocation(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005836 PDiag(diag::err_function_template_spec_no_match)
Douglas Gregorc5df30f2009-09-26 03:41:46 +00005837 << FD->getDeclName(),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00005838 PDiag(diag::err_function_template_spec_ambiguous)
John McCalld5532b62009-11-23 01:53:49 +00005839 << FD->getDeclName() << (ExplicitTemplateArgs != 0),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00005840 PDiag(diag::note_function_template_spec_matched));
John McCallc373d482010-01-27 01:50:18 +00005841 if (Result == Candidates.end())
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005842 return true;
John McCallc373d482010-01-27 01:50:18 +00005843
5844 // Ignore access information; it doesn't figure into redeclaration checking.
5845 FunctionDecl *Specialization = cast<FunctionDecl>(*Result);
Abramo Bagnaraabfb4052011-03-04 17:20:30 +00005846
5847 FunctionTemplateSpecializationInfo *SpecInfo
5848 = Specialization->getTemplateSpecializationInfo();
5849 assert(SpecInfo && "Function template specialization info missing?");
Francois Pichet59e7c562011-07-08 06:21:47 +00005850
5851 // Note: do not overwrite location info if previous template
5852 // specialization kind was explicit.
5853 TemplateSpecializationKind TSK = SpecInfo->getTemplateSpecializationKind();
Richard Smithff234882012-02-20 23:28:05 +00005854 if (TSK == TSK_Undeclared || TSK == TSK_ImplicitInstantiation) {
Francois Pichet59e7c562011-07-08 06:21:47 +00005855 Specialization->setLocation(FD->getLocation());
Richard Smithff234882012-02-20 23:28:05 +00005856 // C++11 [dcl.constexpr]p1: An explicit specialization of a constexpr
5857 // function can differ from the template declaration with respect to
5858 // the constexpr specifier.
5859 Specialization->setConstexpr(FD->isConstexpr());
5860 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005861
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005862 // FIXME: Check if the prior specialization has a point of instantiation.
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005863 // If so, we have run afoul of .
John McCall7ad650f2010-03-24 07:46:06 +00005864
5865 // If this is a friend declaration, then we're not really declaring
5866 // an explicit specialization.
5867 bool isFriend = (FD->getFriendObjectKind() != Decl::FOK_None);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005868
Douglas Gregord5cb8762009-10-07 00:13:32 +00005869 // Check the scope of this explicit specialization.
John McCall7ad650f2010-03-24 07:46:06 +00005870 if (!isFriend &&
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005871 CheckTemplateSpecializationScope(*this,
Douglas Gregord5cb8762009-10-07 00:13:32 +00005872 Specialization->getPrimaryTemplate(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005873 Specialization, FD->getLocation(),
Douglas Gregor9302da62009-10-14 23:50:59 +00005874 false))
Douglas Gregord5cb8762009-10-07 00:13:32 +00005875 return true;
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005876
5877 // C++ [temp.expl.spec]p6:
5878 // If a template, a member template or the member of a class template is
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005879 // explicitly specialized then that specialization shall be declared
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005880 // before the first use of that specialization that would cause an implicit
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005881 // instantiation to take place, in every translation unit in which such a
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005882 // use occurs; no diagnostic is required.
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005883 bool HasNoEffect = false;
John McCall7ad650f2010-03-24 07:46:06 +00005884 if (!isFriend &&
5885 CheckSpecializationInstantiationRedecl(FD->getLocation(),
John McCall75042392010-02-11 01:33:53 +00005886 TSK_ExplicitSpecialization,
5887 Specialization,
5888 SpecInfo->getTemplateSpecializationKind(),
5889 SpecInfo->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00005890 HasNoEffect))
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005891 return true;
Douglas Gregore885e182011-05-21 18:53:30 +00005892
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005893 // Mark the prior declaration as an explicit specialization, so that later
5894 // clients know that this is an explicit specialization.
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00005895 if (!isFriend) {
John McCall7ad650f2010-03-24 07:46:06 +00005896 SpecInfo->setTemplateSpecializationKind(TSK_ExplicitSpecialization);
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00005897 MarkUnusedFileScopedDecl(Specialization);
5898 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005899
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005900 // Turn the given function declaration into a function template
5901 // specialization, with the template arguments from the previous
5902 // specialization.
Abramo Bagnarae03db982010-05-20 15:32:11 +00005903 // Take copies of (semantic and syntactic) template argument lists.
5904 const TemplateArgumentList* TemplArgs = new (Context)
5905 TemplateArgumentList(Specialization->getTemplateSpecializationArgs());
Douglas Gregor838db382010-02-11 01:19:42 +00005906 FD->setFunctionTemplateSpecialization(Specialization->getPrimaryTemplate(),
Abramo Bagnarae03db982010-05-20 15:32:11 +00005907 TemplArgs, /*InsertPos=*/0,
5908 SpecInfo->getTemplateSpecializationKind(),
Argyrios Kyrtzidis71a76052011-09-22 20:07:09 +00005909 ExplicitTemplateArgs);
Douglas Gregore885e182011-05-21 18:53:30 +00005910 FD->setStorageClass(Specialization->getStorageClass());
5911
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005912 // The "previous declaration" for this function template specialization is
5913 // the prior function template specialization.
John McCall68263142009-11-18 22:49:29 +00005914 Previous.clear();
5915 Previous.addDecl(Specialization);
Douglas Gregorb9aa6b22009-09-24 23:14:47 +00005916 return false;
5917}
5918
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005919/// \brief Perform semantic analysis for the given non-template member
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005920/// specialization.
5921///
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005922/// This routine performs all of the semantic analysis required for an
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005923/// explicit member function specialization. On successful completion,
5924/// the function declaration \p FD will become a member function
5925/// specialization.
5926///
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005927/// \param Member the member declaration, which will be updated to become a
5928/// specialization.
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005929///
John McCall68263142009-11-18 22:49:29 +00005930/// \param Previous the set of declarations, one of which may be specialized
5931/// by this function specialization; the set will be modified to contain the
5932/// redeclared member.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005933bool
John McCall68263142009-11-18 22:49:29 +00005934Sema::CheckMemberSpecialization(NamedDecl *Member, LookupResult &Previous) {
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005935 assert(!isa<TemplateDecl>(Member) && "Only for non-template members");
John McCall77e8b112010-04-13 20:37:33 +00005936
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005937 // Try to find the member we are instantiating.
5938 NamedDecl *Instantiation = 0;
5939 NamedDecl *InstantiatedFrom = 0;
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005940 MemberSpecializationInfo *MSInfo = 0;
5941
John McCall68263142009-11-18 22:49:29 +00005942 if (Previous.empty()) {
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005943 // Nowhere to look anyway.
5944 } else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Member)) {
John McCall68263142009-11-18 22:49:29 +00005945 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
5946 I != E; ++I) {
5947 NamedDecl *D = (*I)->getUnderlyingDecl();
5948 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005949 if (Context.hasSameType(Function->getType(), Method->getType())) {
5950 Instantiation = Method;
5951 InstantiatedFrom = Method->getInstantiatedFromMemberFunction();
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005952 MSInfo = Method->getMemberSpecializationInfo();
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005953 break;
5954 }
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005955 }
5956 }
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005957 } else if (isa<VarDecl>(Member)) {
John McCall68263142009-11-18 22:49:29 +00005958 VarDecl *PrevVar;
5959 if (Previous.isSingleResult() &&
5960 (PrevVar = dyn_cast<VarDecl>(Previous.getFoundDecl())))
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005961 if (PrevVar->isStaticDataMember()) {
John McCall68263142009-11-18 22:49:29 +00005962 Instantiation = PrevVar;
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005963 InstantiatedFrom = PrevVar->getInstantiatedFromStaticDataMember();
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005964 MSInfo = PrevVar->getMemberSpecializationInfo();
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005965 }
5966 } else if (isa<RecordDecl>(Member)) {
John McCall68263142009-11-18 22:49:29 +00005967 CXXRecordDecl *PrevRecord;
5968 if (Previous.isSingleResult() &&
5969 (PrevRecord = dyn_cast<CXXRecordDecl>(Previous.getFoundDecl()))) {
5970 Instantiation = PrevRecord;
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005971 InstantiatedFrom = PrevRecord->getInstantiatedFromMemberClass();
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00005972 MSInfo = PrevRecord->getMemberSpecializationInfo();
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005973 }
Richard Smith1af83c42012-03-23 03:33:32 +00005974 } else if (isa<EnumDecl>(Member)) {
5975 EnumDecl *PrevEnum;
5976 if (Previous.isSingleResult() &&
5977 (PrevEnum = dyn_cast<EnumDecl>(Previous.getFoundDecl()))) {
5978 Instantiation = PrevEnum;
5979 InstantiatedFrom = PrevEnum->getInstantiatedFromMemberEnum();
5980 MSInfo = PrevEnum->getMemberSpecializationInfo();
5981 }
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005982 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00005983
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005984 if (!Instantiation) {
Douglas Gregor251b4ff2009-10-08 07:24:58 +00005985 // There is no previous declaration that matches. Since member
Douglas Gregor1fef4e62009-10-07 22:35:40 +00005986 // specializations are always out-of-line, the caller will complain about
5987 // this mismatch later.
5988 return false;
5989 }
John McCall77e8b112010-04-13 20:37:33 +00005990
5991 // If this is a friend, just bail out here before we start turning
5992 // things into explicit specializations.
5993 if (Member->getFriendObjectKind() != Decl::FOK_None) {
5994 // Preserve instantiation information.
5995 if (InstantiatedFrom && isa<CXXMethodDecl>(Member)) {
5996 cast<CXXMethodDecl>(Member)->setInstantiationOfMemberFunction(
5997 cast<CXXMethodDecl>(InstantiatedFrom),
5998 cast<CXXMethodDecl>(Instantiation)->getTemplateSpecializationKind());
5999 } else if (InstantiatedFrom && isa<CXXRecordDecl>(Member)) {
6000 cast<CXXRecordDecl>(Member)->setInstantiationOfMemberClass(
6001 cast<CXXRecordDecl>(InstantiatedFrom),
6002 cast<CXXRecordDecl>(Instantiation)->getTemplateSpecializationKind());
6003 }
6004
6005 Previous.clear();
6006 Previous.addDecl(Instantiation);
6007 return false;
6008 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006009
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006010 // Make sure that this is a specialization of a member.
6011 if (!InstantiatedFrom) {
6012 Diag(Member->getLocation(), diag::err_spec_member_not_instantiated)
6013 << Member;
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006014 Diag(Instantiation->getLocation(), diag::note_specialized_decl);
6015 return true;
6016 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006017
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006018 // C++ [temp.expl.spec]p6:
6019 // If a template, a member template or the member of a class template is
Nico Weberff91d242011-12-23 20:58:04 +00006020 // explicitly specialized then that specialization shall be declared
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006021 // before the first use of that specialization that would cause an implicit
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006022 // instantiation to take place, in every translation unit in which such a
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006023 // use occurs; no diagnostic is required.
6024 assert(MSInfo && "Member specialization info missing?");
John McCall75042392010-02-11 01:33:53 +00006025
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006026 bool HasNoEffect = false;
John McCall75042392010-02-11 01:33:53 +00006027 if (CheckSpecializationInstantiationRedecl(Member->getLocation(),
6028 TSK_ExplicitSpecialization,
6029 Instantiation,
6030 MSInfo->getTemplateSpecializationKind(),
6031 MSInfo->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006032 HasNoEffect))
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00006033 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006034
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006035 // Check the scope of this explicit specialization.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006036 if (CheckTemplateSpecializationScope(*this,
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006037 InstantiatedFrom,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006038 Instantiation, Member->getLocation(),
Douglas Gregor9302da62009-10-14 23:50:59 +00006039 false))
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006040 return true;
Douglas Gregor2db32322009-10-07 23:56:10 +00006041
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006042 // Note that this is an explicit instantiation of a member.
Douglas Gregorf6b11852009-10-08 15:14:33 +00006043 // the original declaration to note that it is an explicit specialization
6044 // (if it was previously an implicit instantiation). This latter step
6045 // makes bookkeeping easier.
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006046 if (isa<FunctionDecl>(Member)) {
Douglas Gregorf6b11852009-10-08 15:14:33 +00006047 FunctionDecl *InstantiationFunction = cast<FunctionDecl>(Instantiation);
6048 if (InstantiationFunction->getTemplateSpecializationKind() ==
6049 TSK_ImplicitInstantiation) {
6050 InstantiationFunction->setTemplateSpecializationKind(
6051 TSK_ExplicitSpecialization);
6052 InstantiationFunction->setLocation(Member->getLocation());
6053 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006054
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006055 cast<FunctionDecl>(Member)->setInstantiationOfMemberFunction(
6056 cast<CXXMethodDecl>(InstantiatedFrom),
6057 TSK_ExplicitSpecialization);
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00006058 MarkUnusedFileScopedDecl(InstantiationFunction);
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006059 } else if (isa<VarDecl>(Member)) {
Douglas Gregorf6b11852009-10-08 15:14:33 +00006060 VarDecl *InstantiationVar = cast<VarDecl>(Instantiation);
6061 if (InstantiationVar->getTemplateSpecializationKind() ==
6062 TSK_ImplicitInstantiation) {
6063 InstantiationVar->setTemplateSpecializationKind(
6064 TSK_ExplicitSpecialization);
6065 InstantiationVar->setLocation(Member->getLocation());
6066 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006067
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006068 Context.setInstantiatedFromStaticDataMember(cast<VarDecl>(Member),
6069 cast<VarDecl>(InstantiatedFrom),
6070 TSK_ExplicitSpecialization);
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +00006071 MarkUnusedFileScopedDecl(InstantiationVar);
Richard Smith1af83c42012-03-23 03:33:32 +00006072 } else if (isa<CXXRecordDecl>(Member)) {
Douglas Gregorf6b11852009-10-08 15:14:33 +00006073 CXXRecordDecl *InstantiationClass = cast<CXXRecordDecl>(Instantiation);
6074 if (InstantiationClass->getTemplateSpecializationKind() ==
6075 TSK_ImplicitInstantiation) {
6076 InstantiationClass->setTemplateSpecializationKind(
6077 TSK_ExplicitSpecialization);
6078 InstantiationClass->setLocation(Member->getLocation());
6079 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006080
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006081 cast<CXXRecordDecl>(Member)->setInstantiationOfMemberClass(
Douglas Gregorf6b11852009-10-08 15:14:33 +00006082 cast<CXXRecordDecl>(InstantiatedFrom),
6083 TSK_ExplicitSpecialization);
Richard Smith1af83c42012-03-23 03:33:32 +00006084 } else {
6085 assert(isa<EnumDecl>(Member) && "Only member enums remain");
6086 EnumDecl *InstantiationEnum = cast<EnumDecl>(Instantiation);
6087 if (InstantiationEnum->getTemplateSpecializationKind() ==
6088 TSK_ImplicitInstantiation) {
6089 InstantiationEnum->setTemplateSpecializationKind(
6090 TSK_ExplicitSpecialization);
6091 InstantiationEnum->setLocation(Member->getLocation());
6092 }
6093
6094 cast<EnumDecl>(Member)->setInstantiationOfMemberEnum(
6095 cast<EnumDecl>(InstantiatedFrom), TSK_ExplicitSpecialization);
Douglas Gregor251b4ff2009-10-08 07:24:58 +00006096 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006097
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006098 // Save the caller the trouble of having to figure out which declaration
6099 // this specialization matches.
John McCall68263142009-11-18 22:49:29 +00006100 Previous.clear();
6101 Previous.addDecl(Instantiation);
Douglas Gregor1fef4e62009-10-07 22:35:40 +00006102 return false;
6103}
6104
Douglas Gregor558c0322009-10-14 23:41:34 +00006105/// \brief Check the scope of an explicit instantiation.
Douglas Gregor669eed82010-07-13 00:10:04 +00006106///
6107/// \returns true if a serious error occurs, false otherwise.
6108static bool CheckExplicitInstantiationScope(Sema &S, NamedDecl *D,
Douglas Gregor558c0322009-10-14 23:41:34 +00006109 SourceLocation InstLoc,
6110 bool WasQualifiedName) {
Sebastian Redl7a126a42010-08-31 00:36:30 +00006111 DeclContext *OrigContext= D->getDeclContext()->getEnclosingNamespaceContext();
6112 DeclContext *CurContext = S.CurContext->getRedeclContext();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006113
Douglas Gregor669eed82010-07-13 00:10:04 +00006114 if (CurContext->isRecord()) {
6115 S.Diag(InstLoc, diag::err_explicit_instantiation_in_class)
6116 << D;
6117 return true;
6118 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006119
Richard Smith3e2e91e2011-10-18 02:28:33 +00006120 // C++11 [temp.explicit]p3:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006121 // An explicit instantiation shall appear in an enclosing namespace of its
Richard Smith3e2e91e2011-10-18 02:28:33 +00006122 // template. If the name declared in the explicit instantiation is an
6123 // unqualified name, the explicit instantiation shall appear in the
6124 // namespace where its template is declared or, if that namespace is inline
6125 // (7.3.1), any namespace from its enclosing namespace set.
Douglas Gregor558c0322009-10-14 23:41:34 +00006126 //
6127 // This is DR275, which we do not retroactively apply to C++98/03.
Richard Smith3e2e91e2011-10-18 02:28:33 +00006128 if (WasQualifiedName) {
6129 if (CurContext->Encloses(OrigContext))
6130 return false;
6131 } else {
6132 if (CurContext->InEnclosingNamespaceSetOf(OrigContext))
6133 return false;
6134 }
6135
6136 if (NamespaceDecl *NS = dyn_cast<NamespaceDecl>(OrigContext)) {
6137 if (WasQualifiedName)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006138 S.Diag(InstLoc,
David Blaikie4e4d0842012-03-11 07:00:24 +00006139 S.getLangOpts().CPlusPlus0x?
Richard Smith3e2e91e2011-10-18 02:28:33 +00006140 diag::err_explicit_instantiation_out_of_scope :
6141 diag::warn_explicit_instantiation_out_of_scope_0x)
Douglas Gregor558c0322009-10-14 23:41:34 +00006142 << D << NS;
6143 else
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006144 S.Diag(InstLoc,
David Blaikie4e4d0842012-03-11 07:00:24 +00006145 S.getLangOpts().CPlusPlus0x?
Richard Smith3e2e91e2011-10-18 02:28:33 +00006146 diag::err_explicit_instantiation_unqualified_wrong_namespace :
6147 diag::warn_explicit_instantiation_unqualified_wrong_namespace_0x)
6148 << D << NS;
6149 } else
6150 S.Diag(InstLoc,
David Blaikie4e4d0842012-03-11 07:00:24 +00006151 S.getLangOpts().CPlusPlus0x?
Richard Smith3e2e91e2011-10-18 02:28:33 +00006152 diag::err_explicit_instantiation_must_be_global :
6153 diag::warn_explicit_instantiation_must_be_global_0x)
6154 << D;
Douglas Gregor558c0322009-10-14 23:41:34 +00006155 S.Diag(D->getLocation(), diag::note_explicit_instantiation_here);
Douglas Gregor669eed82010-07-13 00:10:04 +00006156 return false;
Douglas Gregor558c0322009-10-14 23:41:34 +00006157}
6158
6159/// \brief Determine whether the given scope specifier has a template-id in it.
6160static bool ScopeSpecifierHasTemplateId(const CXXScopeSpec &SS) {
6161 if (!SS.isSet())
6162 return false;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006163
Richard Smith3e2e91e2011-10-18 02:28:33 +00006164 // C++11 [temp.explicit]p3:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006165 // If the explicit instantiation is for a member function, a member class
Douglas Gregor558c0322009-10-14 23:41:34 +00006166 // or a static data member of a class template specialization, the name of
6167 // the class template specialization in the qualified-id for the member
6168 // name shall be a simple-template-id.
6169 //
6170 // C++98 has the same restriction, just worded differently.
6171 for (NestedNameSpecifier *NNS = (NestedNameSpecifier *)SS.getScopeRep();
6172 NNS; NNS = NNS->getPrefix())
John McCallf4c73712011-01-19 06:33:43 +00006173 if (const Type *T = NNS->getAsType())
Douglas Gregor558c0322009-10-14 23:41:34 +00006174 if (isa<TemplateSpecializationType>(T))
6175 return true;
6176
6177 return false;
6178}
6179
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006180// Explicit instantiation of a class template specialization
John McCallf312b1e2010-08-26 23:41:50 +00006181DeclResult
Mike Stump1eb44332009-09-09 15:08:12 +00006182Sema::ActOnExplicitInstantiation(Scope *S,
Douglas Gregor45f96552009-09-04 06:33:52 +00006183 SourceLocation ExternLoc,
6184 SourceLocation TemplateLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00006185 unsigned TagSpec,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006186 SourceLocation KWLoc,
6187 const CXXScopeSpec &SS,
6188 TemplateTy TemplateD,
6189 SourceLocation TemplateNameLoc,
6190 SourceLocation LAngleLoc,
6191 ASTTemplateArgsPtr TemplateArgsIn,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006192 SourceLocation RAngleLoc,
6193 AttributeList *Attr) {
6194 // Find the class template we're specializing
6195 TemplateName Name = TemplateD.getAsVal<TemplateName>();
Mike Stump1eb44332009-09-09 15:08:12 +00006196 ClassTemplateDecl *ClassTemplate
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006197 = cast<ClassTemplateDecl>(Name.getAsTemplateDecl());
6198
6199 // Check that the specialization uses the same tag kind as the
6200 // original template.
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006201 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
6202 assert(Kind != TTK_Enum &&
6203 "Invalid enum tag in class template explicit instantiation!");
Douglas Gregor501c5ce2009-05-14 16:41:31 +00006204 if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(),
Richard Trieubbf34c02011-06-10 03:11:26 +00006205 Kind, /*isDefinition*/false, KWLoc,
Douglas Gregor501c5ce2009-05-14 16:41:31 +00006206 *ClassTemplate->getIdentifier())) {
Mike Stump1eb44332009-09-09 15:08:12 +00006207 Diag(KWLoc, diag::err_use_with_wrong_tag)
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006208 << ClassTemplate
Douglas Gregor849b2432010-03-31 17:46:05 +00006209 << FixItHint::CreateReplacement(KWLoc,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006210 ClassTemplate->getTemplatedDecl()->getKindName());
Mike Stump1eb44332009-09-09 15:08:12 +00006211 Diag(ClassTemplate->getTemplatedDecl()->getLocation(),
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006212 diag::note_previous_use);
6213 Kind = ClassTemplate->getTemplatedDecl()->getTagKind();
6214 }
6215
Douglas Gregor558c0322009-10-14 23:41:34 +00006216 // C++0x [temp.explicit]p2:
6217 // There are two forms of explicit instantiation: an explicit instantiation
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006218 // definition and an explicit instantiation declaration. An explicit
6219 // instantiation declaration begins with the extern keyword. [...]
Douglas Gregord5cb8762009-10-07 00:13:32 +00006220 TemplateSpecializationKind TSK
6221 = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition
6222 : TSK_ExplicitInstantiationDeclaration;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006223
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006224 // Translate the parser's template argument list in our AST format.
John McCalld5532b62009-11-23 01:53:49 +00006225 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
Douglas Gregor314b97f2009-11-10 19:49:08 +00006226 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006227
6228 // Check that the template argument list is well-formed for this
6229 // template.
Chris Lattner5f9e2722011-07-23 10:55:15 +00006230 SmallVector<TemplateArgument, 4> Converted;
John McCalld5532b62009-11-23 01:53:49 +00006231 if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc,
6232 TemplateArgs, false, Converted))
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006233 return true;
6234
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006235 // Find the class template specialization declaration that
6236 // corresponds to these arguments.
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006237 void *InsertPos = 0;
6238 ClassTemplateSpecializationDecl *PrevDecl
Douglas Gregor910f8002010-11-07 23:05:16 +00006239 = ClassTemplate->findSpecialization(Converted.data(),
6240 Converted.size(), InsertPos);
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006241
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006242 TemplateSpecializationKind PrevDecl_TSK
6243 = PrevDecl ? PrevDecl->getTemplateSpecializationKind() : TSK_Undeclared;
6244
Douglas Gregord5cb8762009-10-07 00:13:32 +00006245 // C++0x [temp.explicit]p2:
6246 // [...] An explicit instantiation shall appear in an enclosing
6247 // namespace of its template. [...]
6248 //
6249 // This is C++ DR 275.
Douglas Gregor669eed82010-07-13 00:10:04 +00006250 if (CheckExplicitInstantiationScope(*this, ClassTemplate, TemplateNameLoc,
6251 SS.isSet()))
6252 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006253
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006254 ClassTemplateSpecializationDecl *Specialization = 0;
6255
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006256 bool HasNoEffect = false;
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006257 if (PrevDecl) {
Douglas Gregor0d035142009-10-27 18:42:08 +00006258 if (CheckSpecializationInstantiationRedecl(TemplateNameLoc, TSK,
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006259 PrevDecl, PrevDecl_TSK,
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006260 PrevDecl->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006261 HasNoEffect))
John McCalld226f652010-08-21 09:40:31 +00006262 return PrevDecl;
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006263
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006264 // Even though HasNoEffect == true means that this explicit instantiation
6265 // has no effect on semantics, we go on to put its syntax in the AST.
6266
6267 if (PrevDecl_TSK == TSK_ImplicitInstantiation ||
6268 PrevDecl_TSK == TSK_Undeclared) {
Douglas Gregor52604ab2009-09-11 21:19:12 +00006269 // Since the only prior class template specialization with these
6270 // arguments was referenced but not declared, reuse that
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006271 // declaration node as our own, updating the source location
6272 // for the template name to reflect our new declaration.
6273 // (Other source locations will be updated later.)
Douglas Gregor52604ab2009-09-11 21:19:12 +00006274 Specialization = PrevDecl;
6275 Specialization->setLocation(TemplateNameLoc);
6276 PrevDecl = 0;
6277 }
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006278 }
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006279
Douglas Gregor52604ab2009-09-11 21:19:12 +00006280 if (!Specialization) {
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006281 // Create a new class template specialization declaration node for
6282 // this explicit specialization.
6283 Specialization
Douglas Gregor13c85772010-05-06 00:28:52 +00006284 = ClassTemplateSpecializationDecl::Create(Context, Kind,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006285 ClassTemplate->getDeclContext(),
Abramo Bagnaraba877ad2011-03-09 14:09:51 +00006286 KWLoc, TemplateNameLoc,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006287 ClassTemplate,
Douglas Gregor910f8002010-11-07 23:05:16 +00006288 Converted.data(),
6289 Converted.size(),
6290 PrevDecl);
John McCallb6217662010-03-15 10:12:16 +00006291 SetNestedNameSpecifier(Specialization, SS);
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006292
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00006293 if (!HasNoEffect && !PrevDecl) {
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006294 // Insert the new specialization.
Argyrios Kyrtzidiscc0b1bc2010-07-20 13:59:28 +00006295 ClassTemplate->AddSpecialization(Specialization, InsertPos);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006296 }
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006297 }
6298
6299 // Build the fully-sugared type for this explicit instantiation as
6300 // the user wrote in the explicit instantiation itself. This means
6301 // that we'll pretty-print the type retrieved from the
6302 // specialization's declaration the way that the user actually wrote
6303 // the explicit instantiation, rather than formatting the name based
6304 // on the "canonical" representation used to store the template
6305 // arguments in the specialization.
John McCall3cb0ebd2010-03-10 03:28:59 +00006306 TypeSourceInfo *WrittenTy
6307 = Context.getTemplateSpecializationTypeInfo(Name, TemplateNameLoc,
6308 TemplateArgs,
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006309 Context.getTypeDeclType(Specialization));
6310 Specialization->setTypeAsWritten(WrittenTy);
6311 TemplateArgsIn.release();
6312
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006313 // Set source locations for keywords.
6314 Specialization->setExternLoc(ExternLoc);
6315 Specialization->setTemplateKeywordLoc(TemplateLoc);
6316
Rafael Espindola0257b7f2012-01-03 06:04:21 +00006317 if (Attr)
6318 ProcessDeclAttributeList(S, Specialization, Attr);
6319
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006320 // Add the explicit instantiation into its lexical context. However,
6321 // since explicit instantiations are never found by name lookup, we
6322 // just put it into the declaration context directly.
6323 Specialization->setLexicalDeclContext(CurContext);
6324 CurContext->addDecl(Specialization);
6325
6326 // Syntax is now OK, so return if it has no other effect on semantics.
6327 if (HasNoEffect) {
6328 // Set the template specialization kind.
6329 Specialization->setTemplateSpecializationKind(TSK);
John McCalld226f652010-08-21 09:40:31 +00006330 return Specialization;
Douglas Gregord78f5982009-11-25 06:01:46 +00006331 }
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006332
6333 // C++ [temp.explicit]p3:
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006334 // A definition of a class template or class member template
6335 // shall be in scope at the point of the explicit instantiation of
6336 // the class template or class member template.
6337 //
6338 // This check comes when we actually try to perform the
6339 // instantiation.
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006340 ClassTemplateSpecializationDecl *Def
6341 = cast_or_null<ClassTemplateSpecializationDecl>(
Douglas Gregor952b0172010-02-11 01:04:33 +00006342 Specialization->getDefinition());
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006343 if (!Def)
Douglas Gregor972e6ce2009-10-27 06:26:26 +00006344 InstantiateClassTemplateSpecialization(TemplateNameLoc, Specialization, TSK);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006345 else if (TSK == TSK_ExplicitInstantiationDefinition) {
Douglas Gregor6fb745b2010-05-13 16:44:06 +00006346 MarkVTableUsed(TemplateNameLoc, Specialization, true);
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006347 Specialization->setPointOfInstantiation(Def->getPointOfInstantiation());
6348 }
Douglas Gregor6fb745b2010-05-13 16:44:06 +00006349
Douglas Gregor0d035142009-10-27 18:42:08 +00006350 // Instantiate the members of this class template specialization.
6351 Def = cast_or_null<ClassTemplateSpecializationDecl>(
Douglas Gregor952b0172010-02-11 01:04:33 +00006352 Specialization->getDefinition());
Rafael Espindolab0f65ca2010-03-22 23:12:48 +00006353 if (Def) {
Rafael Espindolaf075b222010-03-23 19:55:22 +00006354 TemplateSpecializationKind Old_TSK = Def->getTemplateSpecializationKind();
6355
6356 // Fix a TSK_ExplicitInstantiationDeclaration followed by a
6357 // TSK_ExplicitInstantiationDefinition
6358 if (Old_TSK == TSK_ExplicitInstantiationDeclaration &&
6359 TSK == TSK_ExplicitInstantiationDefinition)
6360 Def->setTemplateSpecializationKind(TSK);
Rafael Espindolab0f65ca2010-03-22 23:12:48 +00006361
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006362 InstantiateClassTemplateSpecializationMembers(TemplateNameLoc, Def, TSK);
Rafael Espindolab0f65ca2010-03-22 23:12:48 +00006363 }
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006364
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006365 // Set the template specialization kind.
6366 Specialization->setTemplateSpecializationKind(TSK);
John McCalld226f652010-08-21 09:40:31 +00006367 return Specialization;
Douglas Gregor93dfdb12009-05-13 00:25:59 +00006368}
6369
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006370// Explicit instantiation of a member class of a class template.
John McCalld226f652010-08-21 09:40:31 +00006371DeclResult
Mike Stump1eb44332009-09-09 15:08:12 +00006372Sema::ActOnExplicitInstantiation(Scope *S,
Douglas Gregor45f96552009-09-04 06:33:52 +00006373 SourceLocation ExternLoc,
6374 SourceLocation TemplateLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00006375 unsigned TagSpec,
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006376 SourceLocation KWLoc,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00006377 CXXScopeSpec &SS,
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006378 IdentifierInfo *Name,
6379 SourceLocation NameLoc,
6380 AttributeList *Attr) {
6381
Douglas Gregor402abb52009-05-28 23:31:59 +00006382 bool Owned = false;
John McCallc4e70192009-09-11 04:59:25 +00006383 bool IsDependent = false;
John McCallf312b1e2010-08-26 23:41:50 +00006384 Decl *TagD = ActOnTag(S, TagSpec, Sema::TUK_Reference,
John McCalld226f652010-08-21 09:40:31 +00006385 KWLoc, SS, Name, NameLoc, Attr, AS_none,
Douglas Gregore7612302011-09-09 19:05:14 +00006386 /*ModulePrivateLoc=*/SourceLocation(),
John McCalld226f652010-08-21 09:40:31 +00006387 MultiTemplateParamsArg(*this, 0, 0),
Richard Smithbdad7a22012-01-10 01:33:14 +00006388 Owned, IsDependent, SourceLocation(), false,
Douglas Gregor1274ccd2010-10-08 23:50:27 +00006389 TypeResult());
John McCallc4e70192009-09-11 04:59:25 +00006390 assert(!IsDependent && "explicit instantiation of dependent name not yet handled");
6391
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006392 if (!TagD)
6393 return true;
6394
John McCalld226f652010-08-21 09:40:31 +00006395 TagDecl *Tag = cast<TagDecl>(TagD);
Richard Smith1af83c42012-03-23 03:33:32 +00006396 assert(!Tag->isEnum() && "shouldn't see enumerations here");
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006397
Douglas Gregord0c87372009-05-27 17:30:49 +00006398 if (Tag->isInvalidDecl())
6399 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006400
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006401 CXXRecordDecl *Record = cast<CXXRecordDecl>(Tag);
6402 CXXRecordDecl *Pattern = Record->getInstantiatedFromMemberClass();
6403 if (!Pattern) {
6404 Diag(TemplateLoc, diag::err_explicit_instantiation_nontemplate_type)
6405 << Context.getTypeDeclType(Record);
6406 Diag(Record->getLocation(), diag::note_nontemplate_decl_here);
6407 return true;
6408 }
6409
Douglas Gregor558c0322009-10-14 23:41:34 +00006410 // C++0x [temp.explicit]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006411 // If the explicit instantiation is for a class or member class, the
6412 // elaborated-type-specifier in the declaration shall include a
Douglas Gregor558c0322009-10-14 23:41:34 +00006413 // simple-template-id.
6414 //
6415 // C++98 has the same restriction, just worded differently.
6416 if (!ScopeSpecifierHasTemplateId(SS))
Douglas Gregora2dd8282010-06-16 16:26:47 +00006417 Diag(TemplateLoc, diag::ext_explicit_instantiation_without_qualified_id)
Douglas Gregor558c0322009-10-14 23:41:34 +00006418 << Record << SS.getRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006419
Douglas Gregor558c0322009-10-14 23:41:34 +00006420 // C++0x [temp.explicit]p2:
6421 // There are two forms of explicit instantiation: an explicit instantiation
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006422 // definition and an explicit instantiation declaration. An explicit
Douglas Gregor558c0322009-10-14 23:41:34 +00006423 // instantiation declaration begins with the extern keyword. [...]
Douglas Gregora74bbe22009-10-14 21:46:58 +00006424 TemplateSpecializationKind TSK
6425 = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition
6426 : TSK_ExplicitInstantiationDeclaration;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006427
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006428 // C++0x [temp.explicit]p2:
6429 // [...] An explicit instantiation shall appear in an enclosing
6430 // namespace of its template. [...]
6431 //
6432 // This is C++ DR 275.
Douglas Gregor558c0322009-10-14 23:41:34 +00006433 CheckExplicitInstantiationScope(*this, Record, NameLoc, true);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006434
Douglas Gregor454885e2009-10-15 15:54:05 +00006435 // Verify that it is okay to explicitly instantiate here.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006436 CXXRecordDecl *PrevDecl
Douglas Gregoref96ee02012-01-14 16:38:05 +00006437 = cast_or_null<CXXRecordDecl>(Record->getPreviousDecl());
Douglas Gregor952b0172010-02-11 01:04:33 +00006438 if (!PrevDecl && Record->getDefinition())
Douglas Gregor583f33b2009-10-15 18:07:02 +00006439 PrevDecl = Record;
6440 if (PrevDecl) {
Douglas Gregor454885e2009-10-15 15:54:05 +00006441 MemberSpecializationInfo *MSInfo = PrevDecl->getMemberSpecializationInfo();
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006442 bool HasNoEffect = false;
Douglas Gregor454885e2009-10-15 15:54:05 +00006443 assert(MSInfo && "No member specialization information?");
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006444 if (CheckSpecializationInstantiationRedecl(TemplateLoc, TSK,
Douglas Gregor454885e2009-10-15 15:54:05 +00006445 PrevDecl,
6446 MSInfo->getTemplateSpecializationKind(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006447 MSInfo->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006448 HasNoEffect))
Douglas Gregor454885e2009-10-15 15:54:05 +00006449 return true;
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006450 if (HasNoEffect)
Douglas Gregor454885e2009-10-15 15:54:05 +00006451 return TagD;
6452 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006453
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006454 CXXRecordDecl *RecordDef
Douglas Gregor952b0172010-02-11 01:04:33 +00006455 = cast_or_null<CXXRecordDecl>(Record->getDefinition());
Douglas Gregor89a5bea2009-10-15 22:53:21 +00006456 if (!RecordDef) {
Douglas Gregorbf7643e2009-10-15 12:53:22 +00006457 // C++ [temp.explicit]p3:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006458 // A definition of a member class of a class template shall be in scope
Douglas Gregorbf7643e2009-10-15 12:53:22 +00006459 // at the point of an explicit instantiation of the member class.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006460 CXXRecordDecl *Def
Douglas Gregor952b0172010-02-11 01:04:33 +00006461 = cast_or_null<CXXRecordDecl>(Pattern->getDefinition());
Douglas Gregorbf7643e2009-10-15 12:53:22 +00006462 if (!Def) {
Douglas Gregore2d3a3d2009-10-15 14:05:49 +00006463 Diag(TemplateLoc, diag::err_explicit_instantiation_undefined_member)
6464 << 0 << Record->getDeclName() << Record->getDeclContext();
Douglas Gregorbf7643e2009-10-15 12:53:22 +00006465 Diag(Pattern->getLocation(), diag::note_forward_declaration)
6466 << Pattern;
6467 return true;
Douglas Gregor0d035142009-10-27 18:42:08 +00006468 } else {
6469 if (InstantiateClass(NameLoc, Record, Def,
6470 getTemplateInstantiationArgs(Record),
6471 TSK))
6472 return true;
6473
Douglas Gregor952b0172010-02-11 01:04:33 +00006474 RecordDef = cast_or_null<CXXRecordDecl>(Record->getDefinition());
Douglas Gregor0d035142009-10-27 18:42:08 +00006475 if (!RecordDef)
6476 return true;
6477 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006478 }
6479
Douglas Gregor0d035142009-10-27 18:42:08 +00006480 // Instantiate all of the members of the class.
6481 InstantiateClassMembers(NameLoc, RecordDef,
6482 getTemplateInstantiationArgs(Record), TSK);
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006483
Douglas Gregor6fb745b2010-05-13 16:44:06 +00006484 if (TSK == TSK_ExplicitInstantiationDefinition)
6485 MarkVTableUsed(NameLoc, RecordDef, true);
6486
Mike Stump390b4cc2009-05-16 07:39:55 +00006487 // FIXME: We don't have any representation for explicit instantiations of
6488 // member classes. Such a representation is not needed for compilation, but it
6489 // should be available for clients that want to see all of the declarations in
6490 // the source code.
Douglas Gregor3f5b61c2009-05-14 00:28:11 +00006491 return TagD;
6492}
6493
John McCallf312b1e2010-08-26 23:41:50 +00006494DeclResult Sema::ActOnExplicitInstantiation(Scope *S,
6495 SourceLocation ExternLoc,
6496 SourceLocation TemplateLoc,
6497 Declarator &D) {
Douglas Gregord5a423b2009-09-25 18:43:00 +00006498 // Explicit instantiations always require a name.
Abramo Bagnara25777432010-08-11 22:01:17 +00006499 // TODO: check if/when DNInfo should replace Name.
6500 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
6501 DeclarationName Name = NameInfo.getName();
Douglas Gregord5a423b2009-09-25 18:43:00 +00006502 if (!Name) {
6503 if (!D.isInvalidType())
Daniel Dunbar96a00142012-03-09 18:35:03 +00006504 Diag(D.getDeclSpec().getLocStart(),
Douglas Gregord5a423b2009-09-25 18:43:00 +00006505 diag::err_explicit_instantiation_requires_name)
6506 << D.getDeclSpec().getSourceRange()
6507 << D.getSourceRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006508
Douglas Gregord5a423b2009-09-25 18:43:00 +00006509 return true;
6510 }
6511
6512 // The scope passed in may not be a decl scope. Zip up the scope tree until
6513 // we find one that is.
6514 while ((S->getFlags() & Scope::DeclScope) == 0 ||
6515 (S->getFlags() & Scope::TemplateParamScope) != 0)
6516 S = S->getParent();
6517
6518 // Determine the type of the declaration.
John McCallbf1a0282010-06-04 23:28:52 +00006519 TypeSourceInfo *T = GetTypeForDeclarator(D, S);
6520 QualType R = T->getType();
Douglas Gregord5a423b2009-09-25 18:43:00 +00006521 if (R.isNull())
6522 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006523
Douglas Gregore885e182011-05-21 18:53:30 +00006524 // C++ [dcl.stc]p1:
6525 // A storage-class-specifier shall not be specified in [...] an explicit
6526 // instantiation (14.7.2) directive.
Douglas Gregord5a423b2009-09-25 18:43:00 +00006527 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) {
Douglas Gregord5a423b2009-09-25 18:43:00 +00006528 Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_of_typedef)
6529 << Name;
6530 return true;
Douglas Gregore885e182011-05-21 18:53:30 +00006531 } else if (D.getDeclSpec().getStorageClassSpec()
6532 != DeclSpec::SCS_unspecified) {
6533 // Complain about then remove the storage class specifier.
6534 Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_storage_class)
6535 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
6536
6537 D.getMutableDeclSpec().ClearStorageClassSpecs();
Douglas Gregord5a423b2009-09-25 18:43:00 +00006538 }
6539
Douglas Gregor663b5a02009-10-14 20:14:33 +00006540 // C++0x [temp.explicit]p1:
6541 // [...] An explicit instantiation of a function template shall not use the
6542 // inline or constexpr specifiers.
6543 // Presumably, this also applies to member functions of class templates as
6544 // well.
Richard Smith2dc7ece2011-10-18 03:44:03 +00006545 if (D.getDeclSpec().isInlineSpecified())
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006546 Diag(D.getDeclSpec().getInlineSpecLoc(),
David Blaikie4e4d0842012-03-11 07:00:24 +00006547 getLangOpts().CPlusPlus0x ?
Richard Smith2dc7ece2011-10-18 03:44:03 +00006548 diag::err_explicit_instantiation_inline :
6549 diag::warn_explicit_instantiation_inline_0x)
Richard Smithfe6f6482011-10-14 19:58:02 +00006550 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc());
6551 if (D.getDeclSpec().isConstexprSpecified())
6552 // FIXME: Add a fix-it to remove the 'constexpr' and add a 'const' if one is
6553 // not already specified.
6554 Diag(D.getDeclSpec().getConstexprSpecLoc(),
6555 diag::err_explicit_instantiation_constexpr);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006556
Douglas Gregor558c0322009-10-14 23:41:34 +00006557 // C++0x [temp.explicit]p2:
6558 // There are two forms of explicit instantiation: an explicit instantiation
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006559 // definition and an explicit instantiation declaration. An explicit
6560 // instantiation declaration begins with the extern keyword. [...]
Douglas Gregord5a423b2009-09-25 18:43:00 +00006561 TemplateSpecializationKind TSK
6562 = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition
6563 : TSK_ExplicitInstantiationDeclaration;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006564
Abramo Bagnara25777432010-08-11 22:01:17 +00006565 LookupResult Previous(*this, NameInfo, LookupOrdinaryName);
John McCalla24dc2e2009-11-17 02:14:36 +00006566 LookupParsedName(Previous, S, &D.getCXXScopeSpec());
Douglas Gregord5a423b2009-09-25 18:43:00 +00006567
6568 if (!R->isFunctionType()) {
6569 // C++ [temp.explicit]p1:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006570 // A [...] static data member of a class template can be explicitly
6571 // instantiated from the member definition associated with its class
Douglas Gregord5a423b2009-09-25 18:43:00 +00006572 // template.
John McCalla24dc2e2009-11-17 02:14:36 +00006573 if (Previous.isAmbiguous())
6574 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006575
John McCall1bcee0a2009-12-02 08:25:40 +00006576 VarDecl *Prev = Previous.getAsSingle<VarDecl>();
Douglas Gregord5a423b2009-09-25 18:43:00 +00006577 if (!Prev || !Prev->isStaticDataMember()) {
6578 // We expect to see a data data member here.
6579 Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_not_known)
6580 << Name;
6581 for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end();
6582 P != PEnd; ++P)
John McCallf36e02d2009-10-09 21:13:30 +00006583 Diag((*P)->getLocation(), diag::note_explicit_instantiation_here);
Douglas Gregord5a423b2009-09-25 18:43:00 +00006584 return true;
6585 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006586
Douglas Gregord5a423b2009-09-25 18:43:00 +00006587 if (!Prev->getInstantiatedFromStaticDataMember()) {
6588 // FIXME: Check for explicit specialization?
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006589 Diag(D.getIdentifierLoc(),
Douglas Gregord5a423b2009-09-25 18:43:00 +00006590 diag::err_explicit_instantiation_data_member_not_instantiated)
6591 << Prev;
6592 Diag(Prev->getLocation(), diag::note_explicit_instantiation_here);
6593 // FIXME: Can we provide a note showing where this was declared?
6594 return true;
6595 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006596
Douglas Gregor558c0322009-10-14 23:41:34 +00006597 // C++0x [temp.explicit]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006598 // If the explicit instantiation is for a member function, a member class
Douglas Gregor558c0322009-10-14 23:41:34 +00006599 // or a static data member of a class template specialization, the name of
6600 // the class template specialization in the qualified-id for the member
6601 // name shall be a simple-template-id.
6602 //
6603 // C++98 has the same restriction, just worded differently.
6604 if (!ScopeSpecifierHasTemplateId(D.getCXXScopeSpec()))
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006605 Diag(D.getIdentifierLoc(),
Douglas Gregora2dd8282010-06-16 16:26:47 +00006606 diag::ext_explicit_instantiation_without_qualified_id)
Douglas Gregor558c0322009-10-14 23:41:34 +00006607 << Prev << D.getCXXScopeSpec().getRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006608
Douglas Gregor558c0322009-10-14 23:41:34 +00006609 // Check the scope of this explicit instantiation.
6610 CheckExplicitInstantiationScope(*this, Prev, D.getIdentifierLoc(), true);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006611
Douglas Gregor454885e2009-10-15 15:54:05 +00006612 // Verify that it is okay to explicitly instantiate here.
6613 MemberSpecializationInfo *MSInfo = Prev->getMemberSpecializationInfo();
6614 assert(MSInfo && "Missing static data member specialization info?");
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006615 bool HasNoEffect = false;
Douglas Gregor0d035142009-10-27 18:42:08 +00006616 if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK, Prev,
Douglas Gregor454885e2009-10-15 15:54:05 +00006617 MSInfo->getTemplateSpecializationKind(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006618 MSInfo->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006619 HasNoEffect))
Douglas Gregor454885e2009-10-15 15:54:05 +00006620 return true;
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006621 if (HasNoEffect)
John McCalld226f652010-08-21 09:40:31 +00006622 return (Decl*) 0;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006623
Douglas Gregord5a423b2009-09-25 18:43:00 +00006624 // Instantiate static data member.
Douglas Gregor0a897e32009-10-15 17:21:20 +00006625 Prev->setTemplateSpecializationKind(TSK, D.getIdentifierLoc());
Douglas Gregord5a423b2009-09-25 18:43:00 +00006626 if (TSK == TSK_ExplicitInstantiationDefinition)
Chandler Carruth58e390e2010-08-25 08:27:02 +00006627 InstantiateStaticDataMemberDefinition(D.getIdentifierLoc(), Prev);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006628
Douglas Gregord5a423b2009-09-25 18:43:00 +00006629 // FIXME: Create an ExplicitInstantiation node?
John McCalld226f652010-08-21 09:40:31 +00006630 return (Decl*) 0;
Douglas Gregord5a423b2009-09-25 18:43:00 +00006631 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006632
6633 // If the declarator is a template-id, translate the parser's template
Douglas Gregor0b60d9e2009-09-25 23:53:26 +00006634 // argument list into our AST format.
Douglas Gregordb422df2009-09-25 21:45:23 +00006635 bool HasExplicitTemplateArgs = false;
John McCalld5532b62009-11-23 01:53:49 +00006636 TemplateArgumentListInfo TemplateArgs;
Douglas Gregor3f9a0562009-11-03 01:35:08 +00006637 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
6638 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
John McCalld5532b62009-11-23 01:53:49 +00006639 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc);
6640 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
Douglas Gregordb422df2009-09-25 21:45:23 +00006641 ASTTemplateArgsPtr TemplateArgsPtr(*this,
6642 TemplateId->getTemplateArgs(),
Douglas Gregordb422df2009-09-25 21:45:23 +00006643 TemplateId->NumArgs);
John McCalld5532b62009-11-23 01:53:49 +00006644 translateTemplateArguments(TemplateArgsPtr, TemplateArgs);
Douglas Gregordb422df2009-09-25 21:45:23 +00006645 HasExplicitTemplateArgs = true;
Douglas Gregorb2f81cf2009-10-01 23:51:25 +00006646 TemplateArgsPtr.release();
Douglas Gregordb422df2009-09-25 21:45:23 +00006647 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006648
Douglas Gregord5a423b2009-09-25 18:43:00 +00006649 // C++ [temp.explicit]p1:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006650 // A [...] function [...] can be explicitly instantiated from its template.
6651 // A member function [...] of a class template can be explicitly
6652 // instantiated from the member definition associated with its class
Douglas Gregord5a423b2009-09-25 18:43:00 +00006653 // template.
John McCallc373d482010-01-27 01:50:18 +00006654 UnresolvedSet<8> Matches;
Douglas Gregord5a423b2009-09-25 18:43:00 +00006655 for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end();
6656 P != PEnd; ++P) {
6657 NamedDecl *Prev = *P;
Douglas Gregordb422df2009-09-25 21:45:23 +00006658 if (!HasExplicitTemplateArgs) {
6659 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Prev)) {
6660 if (Context.hasSameUnqualifiedType(Method->getType(), R)) {
6661 Matches.clear();
Douglas Gregor48026d22010-01-11 18:40:55 +00006662
John McCallc373d482010-01-27 01:50:18 +00006663 Matches.addDecl(Method, P.getAccess());
Douglas Gregor48026d22010-01-11 18:40:55 +00006664 if (Method->getTemplateSpecializationKind() == TSK_Undeclared)
6665 break;
Douglas Gregordb422df2009-09-25 21:45:23 +00006666 }
Douglas Gregord5a423b2009-09-25 18:43:00 +00006667 }
6668 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006669
Douglas Gregord5a423b2009-09-25 18:43:00 +00006670 FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Prev);
6671 if (!FunTmpl)
6672 continue;
6673
John McCall5769d612010-02-08 23:07:23 +00006674 TemplateDeductionInfo Info(Context, D.getIdentifierLoc());
Douglas Gregord5a423b2009-09-25 18:43:00 +00006675 FunctionDecl *Specialization = 0;
6676 if (TemplateDeductionResult TDK
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006677 = DeduceTemplateArguments(FunTmpl,
John McCalld5532b62009-11-23 01:53:49 +00006678 (HasExplicitTemplateArgs ? &TemplateArgs : 0),
Douglas Gregord5a423b2009-09-25 18:43:00 +00006679 R, Specialization, Info)) {
6680 // FIXME: Keep track of almost-matches?
6681 (void)TDK;
6682 continue;
6683 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006684
John McCallc373d482010-01-27 01:50:18 +00006685 Matches.addDecl(Specialization, P.getAccess());
Douglas Gregord5a423b2009-09-25 18:43:00 +00006686 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006687
Douglas Gregord5a423b2009-09-25 18:43:00 +00006688 // Find the most specialized function template specialization.
John McCallc373d482010-01-27 01:50:18 +00006689 UnresolvedSetIterator Result
Douglas Gregor5c7bf422011-01-11 17:34:58 +00006690 = getMostSpecialized(Matches.begin(), Matches.end(), TPOC_Other, 0,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006691 D.getIdentifierLoc(),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00006692 PDiag(diag::err_explicit_instantiation_not_known) << Name,
6693 PDiag(diag::err_explicit_instantiation_ambiguous) << Name,
6694 PDiag(diag::note_explicit_instantiation_candidate));
Douglas Gregord5a423b2009-09-25 18:43:00 +00006695
John McCallc373d482010-01-27 01:50:18 +00006696 if (Result == Matches.end())
Douglas Gregord5a423b2009-09-25 18:43:00 +00006697 return true;
John McCallc373d482010-01-27 01:50:18 +00006698
6699 // Ignore access control bits, we don't need them for redeclaration checking.
6700 FunctionDecl *Specialization = cast<FunctionDecl>(*Result);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006701
Douglas Gregor0a897e32009-10-15 17:21:20 +00006702 if (Specialization->getTemplateSpecializationKind() == TSK_Undeclared) {
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006703 Diag(D.getIdentifierLoc(),
Douglas Gregord5a423b2009-09-25 18:43:00 +00006704 diag::err_explicit_instantiation_member_function_not_instantiated)
6705 << Specialization
6706 << (Specialization->getTemplateSpecializationKind() ==
6707 TSK_ExplicitSpecialization);
6708 Diag(Specialization->getLocation(), diag::note_explicit_instantiation_here);
6709 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006710 }
6711
Douglas Gregoref96ee02012-01-14 16:38:05 +00006712 FunctionDecl *PrevDecl = Specialization->getPreviousDecl();
Douglas Gregor583f33b2009-10-15 18:07:02 +00006713 if (!PrevDecl && Specialization->isThisDeclarationADefinition())
6714 PrevDecl = Specialization;
6715
Douglas Gregor0a897e32009-10-15 17:21:20 +00006716 if (PrevDecl) {
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006717 bool HasNoEffect = false;
Douglas Gregor0d035142009-10-27 18:42:08 +00006718 if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006719 PrevDecl,
6720 PrevDecl->getTemplateSpecializationKind(),
Douglas Gregor0a897e32009-10-15 17:21:20 +00006721 PrevDecl->getPointOfInstantiation(),
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006722 HasNoEffect))
Douglas Gregor0a897e32009-10-15 17:21:20 +00006723 return true;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006724
Douglas Gregor0a897e32009-10-15 17:21:20 +00006725 // FIXME: We may still want to build some representation of this
6726 // explicit specialization.
Abramo Bagnarac98971d2010-06-12 07:44:57 +00006727 if (HasNoEffect)
John McCalld226f652010-08-21 09:40:31 +00006728 return (Decl*) 0;
Douglas Gregor0a897e32009-10-15 17:21:20 +00006729 }
Anders Carlsson26d6e9d2009-11-24 05:34:41 +00006730
6731 Specialization->setTemplateSpecializationKind(TSK, D.getIdentifierLoc());
Rafael Espindola256fc4d2012-01-04 05:40:59 +00006732 AttributeList *Attr = D.getDeclSpec().getAttributes().getList();
6733 if (Attr)
6734 ProcessDeclAttributeList(S, Specialization, Attr);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006735
Douglas Gregor0a897e32009-10-15 17:21:20 +00006736 if (TSK == TSK_ExplicitInstantiationDefinition)
Chandler Carruth58e390e2010-08-25 08:27:02 +00006737 InstantiateFunctionDefinition(D.getIdentifierLoc(), Specialization);
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006738
Douglas Gregor558c0322009-10-14 23:41:34 +00006739 // C++0x [temp.explicit]p2:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006740 // If the explicit instantiation is for a member function, a member class
Douglas Gregor558c0322009-10-14 23:41:34 +00006741 // or a static data member of a class template specialization, the name of
6742 // the class template specialization in the qualified-id for the member
6743 // name shall be a simple-template-id.
6744 //
6745 // C++98 has the same restriction, just worded differently.
Douglas Gregor0a897e32009-10-15 17:21:20 +00006746 FunctionTemplateDecl *FunTmpl = Specialization->getPrimaryTemplate();
Douglas Gregor3f9a0562009-11-03 01:35:08 +00006747 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId && !FunTmpl &&
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006748 D.getCXXScopeSpec().isSet() &&
Douglas Gregor558c0322009-10-14 23:41:34 +00006749 !ScopeSpecifierHasTemplateId(D.getCXXScopeSpec()))
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006750 Diag(D.getIdentifierLoc(),
Douglas Gregora2dd8282010-06-16 16:26:47 +00006751 diag::ext_explicit_instantiation_without_qualified_id)
Douglas Gregor558c0322009-10-14 23:41:34 +00006752 << Specialization << D.getCXXScopeSpec().getRange();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006753
Douglas Gregor558c0322009-10-14 23:41:34 +00006754 CheckExplicitInstantiationScope(*this,
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006755 FunTmpl? (NamedDecl *)FunTmpl
Douglas Gregor558c0322009-10-14 23:41:34 +00006756 : Specialization->getInstantiatedFromMemberFunction(),
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006757 D.getIdentifierLoc(),
Douglas Gregor558c0322009-10-14 23:41:34 +00006758 D.getCXXScopeSpec().isSet());
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006759
Douglas Gregord5a423b2009-09-25 18:43:00 +00006760 // FIXME: Create some kind of ExplicitInstantiationDecl here.
John McCalld226f652010-08-21 09:40:31 +00006761 return (Decl*) 0;
Douglas Gregord5a423b2009-09-25 18:43:00 +00006762}
6763
John McCallf312b1e2010-08-26 23:41:50 +00006764TypeResult
John McCallc4e70192009-09-11 04:59:25 +00006765Sema::ActOnDependentTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
6766 const CXXScopeSpec &SS, IdentifierInfo *Name,
6767 SourceLocation TagLoc, SourceLocation NameLoc) {
6768 // This has to hold, because SS is expected to be defined.
6769 assert(Name && "Expected a name in a dependent tag");
6770
6771 NestedNameSpecifier *NNS
6772 = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
6773 if (!NNS)
6774 return true;
6775
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006776 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
Daniel Dunbar12c0ade2010-04-01 16:50:48 +00006777
Douglas Gregor48c89f42010-04-24 16:38:41 +00006778 if (TUK == TUK_Declaration || TUK == TUK_Definition) {
6779 Diag(NameLoc, diag::err_dependent_tag_decl)
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006780 << (TUK == TUK_Definition) << Kind << SS.getRange();
Douglas Gregor48c89f42010-04-24 16:38:41 +00006781 return true;
6782 }
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006783
Douglas Gregor059101f2011-03-02 00:47:37 +00006784 // Create the resulting type.
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006785 ElaboratedTypeKeyword Kwd = TypeWithKeyword::getKeywordForTagTypeKind(Kind);
Douglas Gregor059101f2011-03-02 00:47:37 +00006786 QualType Result = Context.getDependentNameType(Kwd, NNS, Name);
6787
6788 // Create type-source location information for this type.
6789 TypeLocBuilder TLB;
6790 DependentNameTypeLoc TL = TLB.push<DependentNameTypeLoc>(Result);
Abramo Bagnara38a42912012-02-06 19:09:27 +00006791 TL.setElaboratedKeywordLoc(TagLoc);
Douglas Gregor059101f2011-03-02 00:47:37 +00006792 TL.setQualifierLoc(SS.getWithLocInContext(Context));
6793 TL.setNameLoc(NameLoc);
6794 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
John McCallc4e70192009-09-11 04:59:25 +00006795}
6796
John McCallf312b1e2010-08-26 23:41:50 +00006797TypeResult
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006798Sema::ActOnTypenameType(Scope *S, SourceLocation TypenameLoc,
6799 const CXXScopeSpec &SS, const IdentifierInfo &II,
Douglas Gregor1a15dae2010-06-16 22:31:08 +00006800 SourceLocation IdLoc) {
Douglas Gregore29425b2011-02-28 22:42:13 +00006801 if (SS.isInvalid())
Douglas Gregord57959a2009-03-27 23:10:48 +00006802 return true;
Douglas Gregore29425b2011-02-28 22:42:13 +00006803
Richard Smithebaf0e62011-10-18 20:49:44 +00006804 if (TypenameLoc.isValid() && S && !S->getTemplateParamParent())
6805 Diag(TypenameLoc,
David Blaikie4e4d0842012-03-11 07:00:24 +00006806 getLangOpts().CPlusPlus0x ?
Richard Smithebaf0e62011-10-18 20:49:44 +00006807 diag::warn_cxx98_compat_typename_outside_of_template :
6808 diag::ext_typename_outside_of_template)
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006809 << FixItHint::CreateRemoval(TypenameLoc);
6810
Douglas Gregor2494dd02011-03-01 01:34:45 +00006811 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
Douglas Gregor9e876872011-03-01 18:12:44 +00006812 QualType T = CheckTypenameType(TypenameLoc.isValid()? ETK_Typename : ETK_None,
6813 TypenameLoc, QualifierLoc, II, IdLoc);
Douglas Gregor31a19b62009-04-01 21:51:26 +00006814 if (T.isNull())
6815 return true;
John McCall63b43852010-04-29 23:50:39 +00006816
6817 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T);
6818 if (isa<DependentNameType>(T)) {
6819 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc());
Abramo Bagnara38a42912012-02-06 19:09:27 +00006820 TL.setElaboratedKeywordLoc(TypenameLoc);
Douglas Gregor2494dd02011-03-01 01:34:45 +00006821 TL.setQualifierLoc(QualifierLoc);
John McCall4e449832010-05-28 23:32:21 +00006822 TL.setNameLoc(IdLoc);
John McCall63b43852010-04-29 23:50:39 +00006823 } else {
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006824 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc());
Abramo Bagnara38a42912012-02-06 19:09:27 +00006825 TL.setElaboratedKeywordLoc(TypenameLoc);
Douglas Gregor9e876872011-03-01 18:12:44 +00006826 TL.setQualifierLoc(QualifierLoc);
John McCall4e449832010-05-28 23:32:21 +00006827 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(IdLoc);
John McCall63b43852010-04-29 23:50:39 +00006828 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006829
John McCallb3d87482010-08-24 05:47:05 +00006830 return CreateParsedType(T, TSI);
Douglas Gregord57959a2009-03-27 23:10:48 +00006831}
6832
John McCallf312b1e2010-08-26 23:41:50 +00006833TypeResult
Abramo Bagnara55d23c92012-02-06 14:41:24 +00006834Sema::ActOnTypenameType(Scope *S,
6835 SourceLocation TypenameLoc,
6836 const CXXScopeSpec &SS,
6837 SourceLocation TemplateKWLoc,
Douglas Gregora02411e2011-02-27 22:46:49 +00006838 TemplateTy TemplateIn,
6839 SourceLocation TemplateNameLoc,
6840 SourceLocation LAngleLoc,
6841 ASTTemplateArgsPtr TemplateArgsIn,
6842 SourceLocation RAngleLoc) {
Richard Smithebaf0e62011-10-18 20:49:44 +00006843 if (TypenameLoc.isValid() && S && !S->getTemplateParamParent())
6844 Diag(TypenameLoc,
David Blaikie4e4d0842012-03-11 07:00:24 +00006845 getLangOpts().CPlusPlus0x ?
Richard Smithebaf0e62011-10-18 20:49:44 +00006846 diag::warn_cxx98_compat_typename_outside_of_template :
6847 diag::ext_typename_outside_of_template)
6848 << FixItHint::CreateRemoval(TypenameLoc);
Douglas Gregora02411e2011-02-27 22:46:49 +00006849
6850 // Translate the parser's template argument list in our AST format.
6851 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
6852 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
6853
6854 TemplateName Template = TemplateIn.get();
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006855 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
6856 // Construct a dependent template specialization type.
6857 assert(DTN && "dependent template has non-dependent name?");
6858 assert(DTN->getQualifier()
6859 == static_cast<NestedNameSpecifier*>(SS.getScopeRep()));
6860 QualType T = Context.getDependentTemplateSpecializationType(ETK_Typename,
6861 DTN->getQualifier(),
6862 DTN->getIdentifier(),
6863 TemplateArgs);
Douglas Gregora02411e2011-02-27 22:46:49 +00006864
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006865 // Create source-location information for this type.
John McCall4e449832010-05-28 23:32:21 +00006866 TypeLocBuilder Builder;
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006867 DependentTemplateSpecializationTypeLoc SpecTL
6868 = Builder.push<DependentTemplateSpecializationTypeLoc>(T);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00006869 SpecTL.setElaboratedKeywordLoc(TypenameLoc);
6870 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
Abramo Bagnara66581d42012-02-06 22:45:07 +00006871 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00006872 SpecTL.setTemplateNameLoc(TemplateNameLoc);
Douglas Gregora02411e2011-02-27 22:46:49 +00006873 SpecTL.setLAngleLoc(LAngleLoc);
6874 SpecTL.setRAngleLoc(RAngleLoc);
Douglas Gregora02411e2011-02-27 22:46:49 +00006875 for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
6876 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006877 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
Douglas Gregor6946baf2009-09-02 13:05:45 +00006878 }
Douglas Gregora02411e2011-02-27 22:46:49 +00006879
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006880 QualType T = CheckTemplateIdType(Template, TemplateNameLoc, TemplateArgs);
6881 if (T.isNull())
6882 return true;
Douglas Gregora02411e2011-02-27 22:46:49 +00006883
Abramo Bagnara55d23c92012-02-06 14:41:24 +00006884 // Provide source-location information for the template specialization type.
Douglas Gregora02411e2011-02-27 22:46:49 +00006885 TypeLocBuilder Builder;
Abramo Bagnara55d23c92012-02-06 14:41:24 +00006886 TemplateSpecializationTypeLoc SpecTL
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006887 = Builder.push<TemplateSpecializationTypeLoc>(T);
Abramo Bagnara55d23c92012-02-06 14:41:24 +00006888 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
6889 SpecTL.setTemplateNameLoc(TemplateNameLoc);
Douglas Gregora02411e2011-02-27 22:46:49 +00006890 SpecTL.setLAngleLoc(LAngleLoc);
6891 SpecTL.setRAngleLoc(RAngleLoc);
Douglas Gregora02411e2011-02-27 22:46:49 +00006892 for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
6893 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
6894
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006895 T = Context.getElaboratedType(ETK_Typename, SS.getScopeRep(), T);
6896 ElaboratedTypeLoc TL = Builder.push<ElaboratedTypeLoc>(T);
Abramo Bagnara38a42912012-02-06 19:09:27 +00006897 TL.setElaboratedKeywordLoc(TypenameLoc);
Douglas Gregor9e876872011-03-01 18:12:44 +00006898 TL.setQualifierLoc(SS.getWithLocInContext(Context));
6899
Douglas Gregoref24c4b2011-03-01 16:44:30 +00006900 TypeSourceInfo *TSI = Builder.getTypeSourceInfo(Context, T);
6901 return CreateParsedType(T, TSI);
Douglas Gregor17343172009-04-01 00:28:59 +00006902}
6903
Douglas Gregora02411e2011-02-27 22:46:49 +00006904
Douglas Gregord57959a2009-03-27 23:10:48 +00006905/// \brief Build the type that describes a C++ typename specifier,
6906/// e.g., "typename T::type".
6907QualType
Douglas Gregore29425b2011-02-28 22:42:13 +00006908Sema::CheckTypenameType(ElaboratedTypeKeyword Keyword,
6909 SourceLocation KeywordLoc,
6910 NestedNameSpecifierLoc QualifierLoc,
6911 const IdentifierInfo &II,
Abramo Bagnarae4da7a02010-05-19 21:37:53 +00006912 SourceLocation IILoc) {
John McCall77bb1aa2010-05-01 00:40:08 +00006913 CXXScopeSpec SS;
Douglas Gregore29425b2011-02-28 22:42:13 +00006914 SS.Adopt(QualifierLoc);
Douglas Gregord57959a2009-03-27 23:10:48 +00006915
John McCall77bb1aa2010-05-01 00:40:08 +00006916 DeclContext *Ctx = computeDeclContext(SS);
6917 if (!Ctx) {
6918 // If the nested-name-specifier is dependent and couldn't be
6919 // resolved to a type, build a typename type.
Douglas Gregore29425b2011-02-28 22:42:13 +00006920 assert(QualifierLoc.getNestedNameSpecifier()->isDependent());
6921 return Context.getDependentNameType(Keyword,
6922 QualifierLoc.getNestedNameSpecifier(),
6923 &II);
Douglas Gregor42af25f2009-05-11 19:58:34 +00006924 }
Douglas Gregord57959a2009-03-27 23:10:48 +00006925
John McCall77bb1aa2010-05-01 00:40:08 +00006926 // If the nested-name-specifier refers to the current instantiation,
6927 // the "typename" keyword itself is superfluous. In C++03, the
6928 // program is actually ill-formed. However, DR 382 (in C++0x CD1)
6929 // allows such extraneous "typename" keywords, and we retroactively
Douglas Gregor732281d2010-06-14 22:07:54 +00006930 // apply this DR to C++03 code with only a warning. In any case we continue.
Douglas Gregor42af25f2009-05-11 19:58:34 +00006931
John McCall77bb1aa2010-05-01 00:40:08 +00006932 if (RequireCompleteDeclContext(SS, Ctx))
6933 return QualType();
Douglas Gregord57959a2009-03-27 23:10:48 +00006934
6935 DeclarationName Name(&II);
Abramo Bagnarae4da7a02010-05-19 21:37:53 +00006936 LookupResult Result(*this, Name, IILoc, LookupOrdinaryName);
John McCalla24dc2e2009-11-17 02:14:36 +00006937 LookupQualifiedName(Result, Ctx);
Douglas Gregord57959a2009-03-27 23:10:48 +00006938 unsigned DiagID = 0;
6939 Decl *Referenced = 0;
John McCalla24dc2e2009-11-17 02:14:36 +00006940 switch (Result.getResultKind()) {
Douglas Gregord57959a2009-03-27 23:10:48 +00006941 case LookupResult::NotFound:
Douglas Gregor3f093272009-10-13 21:16:44 +00006942 DiagID = diag::err_typename_nested_not_found;
Douglas Gregord57959a2009-03-27 23:10:48 +00006943 break;
Douglas Gregord9545042010-12-09 00:06:27 +00006944
6945 case LookupResult::FoundUnresolvedValue: {
6946 // We found a using declaration that is a value. Most likely, the using
6947 // declaration itself is meant to have the 'typename' keyword.
Douglas Gregore29425b2011-02-28 22:42:13 +00006948 SourceRange FullRange(KeywordLoc.isValid() ? KeywordLoc : SS.getBeginLoc(),
Douglas Gregord9545042010-12-09 00:06:27 +00006949 IILoc);
6950 Diag(IILoc, diag::err_typename_refers_to_using_value_decl)
6951 << Name << Ctx << FullRange;
6952 if (UnresolvedUsingValueDecl *Using
6953 = dyn_cast<UnresolvedUsingValueDecl>(Result.getRepresentativeDecl())){
Douglas Gregordc355712011-02-25 00:36:19 +00006954 SourceLocation Loc = Using->getQualifierLoc().getBeginLoc();
Douglas Gregord9545042010-12-09 00:06:27 +00006955 Diag(Loc, diag::note_using_value_decl_missing_typename)
6956 << FixItHint::CreateInsertion(Loc, "typename ");
6957 }
6958 }
6959 // Fall through to create a dependent typename type, from which we can recover
6960 // better.
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006961
Douglas Gregor7d3f5762010-01-15 01:44:47 +00006962 case LookupResult::NotFoundInCurrentInstantiation:
6963 // Okay, it's a member of an unknown instantiation.
Douglas Gregore29425b2011-02-28 22:42:13 +00006964 return Context.getDependentNameType(Keyword,
6965 QualifierLoc.getNestedNameSpecifier(),
6966 &II);
Douglas Gregord57959a2009-03-27 23:10:48 +00006967
6968 case LookupResult::Found:
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00006969 if (TypeDecl *Type = dyn_cast<TypeDecl>(Result.getFoundDecl())) {
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006970 // We found a type. Build an ElaboratedType, since the
6971 // typename-specifier was just sugar.
Douglas Gregore29425b2011-02-28 22:42:13 +00006972 return Context.getElaboratedType(ETK_Typename,
6973 QualifierLoc.getNestedNameSpecifier(),
Abramo Bagnara465d41b2010-05-11 21:36:43 +00006974 Context.getTypeDeclType(Type));
Douglas Gregord57959a2009-03-27 23:10:48 +00006975 }
6976
6977 DiagID = diag::err_typename_nested_not_type;
John McCallf36e02d2009-10-09 21:13:30 +00006978 Referenced = Result.getFoundDecl();
Douglas Gregord57959a2009-03-27 23:10:48 +00006979 break;
6980
6981 case LookupResult::FoundOverloaded:
6982 DiagID = diag::err_typename_nested_not_type;
6983 Referenced = *Result.begin();
6984 break;
6985
John McCall6e247262009-10-10 05:48:19 +00006986 case LookupResult::Ambiguous:
Douglas Gregord57959a2009-03-27 23:10:48 +00006987 return QualType();
6988 }
6989
6990 // If we get here, it's because name lookup did not find a
6991 // type. Emit an appropriate diagnostic and return an error.
Douglas Gregore29425b2011-02-28 22:42:13 +00006992 SourceRange FullRange(KeywordLoc.isValid() ? KeywordLoc : SS.getBeginLoc(),
Abramo Bagnarae4da7a02010-05-19 21:37:53 +00006993 IILoc);
6994 Diag(IILoc, DiagID) << FullRange << Name << Ctx;
Douglas Gregord57959a2009-03-27 23:10:48 +00006995 if (Referenced)
6996 Diag(Referenced->getLocation(), diag::note_typename_refers_here)
6997 << Name;
6998 return QualType();
6999}
Douglas Gregor4a959d82009-08-06 16:20:37 +00007000
7001namespace {
7002 // See Sema::RebuildTypeInCurrentInstantiation
Benjamin Kramer85b45212009-11-28 19:45:26 +00007003 class CurrentInstantiationRebuilder
Mike Stump1eb44332009-09-09 15:08:12 +00007004 : public TreeTransform<CurrentInstantiationRebuilder> {
Douglas Gregor4a959d82009-08-06 16:20:37 +00007005 SourceLocation Loc;
7006 DeclarationName Entity;
Mike Stump1eb44332009-09-09 15:08:12 +00007007
Douglas Gregor4a959d82009-08-06 16:20:37 +00007008 public:
Douglas Gregor895162d2010-04-30 18:55:50 +00007009 typedef TreeTransform<CurrentInstantiationRebuilder> inherited;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007010
Mike Stump1eb44332009-09-09 15:08:12 +00007011 CurrentInstantiationRebuilder(Sema &SemaRef,
Douglas Gregor4a959d82009-08-06 16:20:37 +00007012 SourceLocation Loc,
Mike Stump1eb44332009-09-09 15:08:12 +00007013 DeclarationName Entity)
7014 : TreeTransform<CurrentInstantiationRebuilder>(SemaRef),
Douglas Gregor4a959d82009-08-06 16:20:37 +00007015 Loc(Loc), Entity(Entity) { }
Mike Stump1eb44332009-09-09 15:08:12 +00007016
7017 /// \brief Determine whether the given type \p T has already been
Douglas Gregor4a959d82009-08-06 16:20:37 +00007018 /// transformed.
7019 ///
7020 /// For the purposes of type reconstruction, a type has already been
7021 /// transformed if it is NULL or if it is not dependent.
7022 bool AlreadyTransformed(QualType T) {
7023 return T.isNull() || !T->isDependentType();
7024 }
Mike Stump1eb44332009-09-09 15:08:12 +00007025
7026 /// \brief Returns the location of the entity whose type is being
Douglas Gregor4a959d82009-08-06 16:20:37 +00007027 /// rebuilt.
7028 SourceLocation getBaseLocation() { return Loc; }
Mike Stump1eb44332009-09-09 15:08:12 +00007029
Douglas Gregor4a959d82009-08-06 16:20:37 +00007030 /// \brief Returns the name of the entity whose type is being rebuilt.
7031 DeclarationName getBaseEntity() { return Entity; }
Mike Stump1eb44332009-09-09 15:08:12 +00007032
Douglas Gregor972e6ce2009-10-27 06:26:26 +00007033 /// \brief Sets the "base" location and entity when that
7034 /// information is known based on another transformation.
7035 void setBase(SourceLocation Loc, DeclarationName Entity) {
7036 this->Loc = Loc;
7037 this->Entity = Entity;
7038 }
Douglas Gregordfca6f52012-02-13 22:00:16 +00007039
7040 ExprResult TransformLambdaExpr(LambdaExpr *E) {
7041 // Lambdas never need to be transformed.
7042 return E;
7043 }
Douglas Gregor4a959d82009-08-06 16:20:37 +00007044 };
7045}
7046
Douglas Gregor4a959d82009-08-06 16:20:37 +00007047/// \brief Rebuilds a type within the context of the current instantiation.
7048///
Mike Stump1eb44332009-09-09 15:08:12 +00007049/// The type \p T is part of the type of an out-of-line member definition of
Douglas Gregor4a959d82009-08-06 16:20:37 +00007050/// a class template (or class template partial specialization) that was parsed
Mike Stump1eb44332009-09-09 15:08:12 +00007051/// and constructed before we entered the scope of the class template (or
Douglas Gregor4a959d82009-08-06 16:20:37 +00007052/// partial specialization thereof). This routine will rebuild that type now
7053/// that we have entered the declarator's scope, which may produce different
7054/// canonical types, e.g.,
7055///
7056/// \code
7057/// template<typename T>
7058/// struct X {
7059/// typedef T* pointer;
7060/// pointer data();
7061/// };
7062///
7063/// template<typename T>
7064/// typename X<T>::pointer X<T>::data() { ... }
7065/// \endcode
7066///
Douglas Gregor4714c122010-03-31 17:34:00 +00007067/// Here, the type "typename X<T>::pointer" will be created as a DependentNameType,
Douglas Gregor4a959d82009-08-06 16:20:37 +00007068/// since we do not know that we can look into X<T> when we parsed the type.
7069/// This function will rebuild the type, performing the lookup of "pointer"
Abramo Bagnara465d41b2010-05-11 21:36:43 +00007070/// in X<T> and returning an ElaboratedType whose canonical type is the same
Douglas Gregor4a959d82009-08-06 16:20:37 +00007071/// as the canonical type of T*, allowing the return types of the out-of-line
7072/// definition and the declaration to match.
John McCall63b43852010-04-29 23:50:39 +00007073TypeSourceInfo *Sema::RebuildTypeInCurrentInstantiation(TypeSourceInfo *T,
7074 SourceLocation Loc,
7075 DeclarationName Name) {
7076 if (!T || !T->getType()->isDependentType())
Douglas Gregor4a959d82009-08-06 16:20:37 +00007077 return T;
Mike Stump1eb44332009-09-09 15:08:12 +00007078
Douglas Gregor4a959d82009-08-06 16:20:37 +00007079 CurrentInstantiationRebuilder Rebuilder(*this, Loc, Name);
7080 return Rebuilder.TransformType(T);
Benjamin Kramer27ba2f02009-08-11 22:33:06 +00007081}
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007082
John McCall60d7b3a2010-08-24 06:29:42 +00007083ExprResult Sema::RebuildExprInCurrentInstantiation(Expr *E) {
John McCallb3d87482010-08-24 05:47:05 +00007084 CurrentInstantiationRebuilder Rebuilder(*this, E->getExprLoc(),
7085 DeclarationName());
7086 return Rebuilder.TransformExpr(E);
7087}
7088
John McCall63b43852010-04-29 23:50:39 +00007089bool Sema::RebuildNestedNameSpecifierInCurrentInstantiation(CXXScopeSpec &SS) {
Douglas Gregor7e384942011-02-25 16:07:42 +00007090 if (SS.isInvalid())
7091 return true;
John McCall31f17ec2010-04-27 00:57:59 +00007092
Douglas Gregor7e384942011-02-25 16:07:42 +00007093 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
John McCall31f17ec2010-04-27 00:57:59 +00007094 CurrentInstantiationRebuilder Rebuilder(*this, SS.getRange().getBegin(),
7095 DeclarationName());
Douglas Gregor7e384942011-02-25 16:07:42 +00007096 NestedNameSpecifierLoc Rebuilt
7097 = Rebuilder.TransformNestedNameSpecifierLoc(QualifierLoc);
7098 if (!Rebuilt)
7099 return true;
John McCall63b43852010-04-29 23:50:39 +00007100
Douglas Gregor7e384942011-02-25 16:07:42 +00007101 SS.Adopt(Rebuilt);
John McCall63b43852010-04-29 23:50:39 +00007102 return false;
John McCall31f17ec2010-04-27 00:57:59 +00007103}
7104
Douglas Gregor20606502011-10-14 15:31:12 +00007105/// \brief Rebuild the template parameters now that we know we're in a current
7106/// instantiation.
7107bool Sema::RebuildTemplateParamsInCurrentInstantiation(
7108 TemplateParameterList *Params) {
7109 for (unsigned I = 0, N = Params->size(); I != N; ++I) {
7110 Decl *Param = Params->getParam(I);
7111
7112 // There is nothing to rebuild in a type parameter.
7113 if (isa<TemplateTypeParmDecl>(Param))
7114 continue;
7115
7116 // Rebuild the template parameter list of a template template parameter.
7117 if (TemplateTemplateParmDecl *TTP
7118 = dyn_cast<TemplateTemplateParmDecl>(Param)) {
7119 if (RebuildTemplateParamsInCurrentInstantiation(
7120 TTP->getTemplateParameters()))
7121 return true;
7122
7123 continue;
7124 }
7125
7126 // Rebuild the type of a non-type template parameter.
7127 NonTypeTemplateParmDecl *NTTP = cast<NonTypeTemplateParmDecl>(Param);
7128 TypeSourceInfo *NewTSI
7129 = RebuildTypeInCurrentInstantiation(NTTP->getTypeSourceInfo(),
7130 NTTP->getLocation(),
7131 NTTP->getDeclName());
7132 if (!NewTSI)
7133 return true;
7134
7135 if (NewTSI != NTTP->getTypeSourceInfo()) {
7136 NTTP->setTypeSourceInfo(NewTSI);
7137 NTTP->setType(NewTSI->getType());
7138 }
7139 }
7140
7141 return false;
7142}
7143
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007144/// \brief Produces a formatted string that describes the binding of
7145/// template parameters to template arguments.
7146std::string
7147Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params,
7148 const TemplateArgumentList &Args) {
Douglas Gregor910f8002010-11-07 23:05:16 +00007149 return getTemplateArgumentBindingsText(Params, Args.data(), Args.size());
Douglas Gregor9148c3f2009-11-11 19:13:48 +00007150}
7151
7152std::string
7153Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params,
7154 const TemplateArgument *Args,
7155 unsigned NumArgs) {
Dylan Noblesmithf7ccbad2012-02-05 02:13:05 +00007156 SmallString<128> Str;
Douglas Gregor87dd6972010-12-20 16:52:59 +00007157 llvm::raw_svector_ostream Out(Str);
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007158
Douglas Gregor9148c3f2009-11-11 19:13:48 +00007159 if (!Params || Params->size() == 0 || NumArgs == 0)
Douglas Gregor87dd6972010-12-20 16:52:59 +00007160 return std::string();
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007161
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007162 for (unsigned I = 0, N = Params->size(); I != N; ++I) {
Douglas Gregor9148c3f2009-11-11 19:13:48 +00007163 if (I >= NumArgs)
7164 break;
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007165
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007166 if (I == 0)
Douglas Gregor87dd6972010-12-20 16:52:59 +00007167 Out << "[with ";
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007168 else
Douglas Gregor87dd6972010-12-20 16:52:59 +00007169 Out << ", ";
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007170
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007171 if (const IdentifierInfo *Id = Params->getParam(I)->getIdentifier()) {
Douglas Gregor87dd6972010-12-20 16:52:59 +00007172 Out << Id->getName();
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007173 } else {
Douglas Gregor87dd6972010-12-20 16:52:59 +00007174 Out << '$' << I;
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007175 }
NAKAMURA Takumidfbb02a2011-01-27 07:10:08 +00007176
Douglas Gregor87dd6972010-12-20 16:52:59 +00007177 Out << " = ";
Douglas Gregor8987b232011-09-27 23:30:47 +00007178 Args[I].print(getPrintingPolicy(), Out);
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007179 }
Douglas Gregor87dd6972010-12-20 16:52:59 +00007180
7181 Out << ']';
7182 return Out.str();
Douglas Gregorbf4ea562009-09-15 16:23:51 +00007183}
Francois Pichet8387e2a2011-04-22 22:18:13 +00007184
7185void Sema::MarkAsLateParsedTemplate(FunctionDecl *FD, bool Flag) {
7186 if (!FD)
7187 return;
7188 FD->setLateTemplateParsed(Flag);
7189}
7190
7191bool Sema::IsInsideALocalClassWithinATemplateFunction() {
7192 DeclContext *DC = CurContext;
7193
7194 while (DC) {
7195 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) {
7196 const FunctionDecl *FD = RD->isLocalClass();
7197 return (FD && FD->getTemplatedKind() != FunctionDecl::TK_NonTemplate);
7198 } else if (DC->isTranslationUnit() || DC->isNamespace())
7199 return false;
7200
7201 DC = DC->getParent();
7202 }
7203 return false;
7204}