Bug Summary

File:tools/clang/lib/Sema/SemaTemplate.cpp
Warning:line 7128, column 9
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SemaTemplate.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-eagerly-assume -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -mrelocation-model pic -pic-level 2 -mthread-model posix -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-7/lib/clang/7.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn338205/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-7~svn338205/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn338205/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn338205/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn338205/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/x86_64-linux-gnu/c++/8 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/x86_64-linux-gnu/c++/8 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/include -internal-externc-isystem /usr/lib/gcc/x86_64-linux-gnu/8/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-7~svn338205/build-llvm/tools/clang/lib/Sema -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-07-29-043837-17923-1 -x c++ /build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp -faddrsig
1//===------- SemaTemplate.cpp - Semantic Analysis for C++ Templates -------===//
2//
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.
7//===----------------------------------------------------------------------===//
8//
9// This file implements semantic analysis for C++ templates.
10//===----------------------------------------------------------------------===//
11
12#include "TreeTransform.h"
13#include "clang/AST/ASTConsumer.h"
14#include "clang/AST/ASTContext.h"
15#include "clang/AST/DeclFriend.h"
16#include "clang/AST/DeclTemplate.h"
17#include "clang/AST/Expr.h"
18#include "clang/AST/ExprCXX.h"
19#include "clang/AST/RecursiveASTVisitor.h"
20#include "clang/AST/TypeVisitor.h"
21#include "clang/Basic/Builtins.h"
22#include "clang/Basic/LangOptions.h"
23#include "clang/Basic/PartialDiagnostic.h"
24#include "clang/Basic/TargetInfo.h"
25#include "clang/Sema/DeclSpec.h"
26#include "clang/Sema/Lookup.h"
27#include "clang/Sema/ParsedTemplate.h"
28#include "clang/Sema/Scope.h"
29#include "clang/Sema/SemaInternal.h"
30#include "clang/Sema/Template.h"
31#include "clang/Sema/TemplateDeduction.h"
32#include "llvm/ADT/SmallBitVector.h"
33#include "llvm/ADT/SmallString.h"
34#include "llvm/ADT/StringExtras.h"
35
36#include <iterator>
37using namespace clang;
38using namespace sema;
39
40// Exported for use by Parser.
41SourceRange
42clang::getTemplateParamsRange(TemplateParameterList const * const *Ps,
43 unsigned N) {
44 if (!N) return SourceRange();
45 return SourceRange(Ps[0]->getTemplateLoc(), Ps[N-1]->getRAngleLoc());
46}
47
48namespace clang {
49/// [temp.constr.decl]p2: A template's associated constraints are
50/// defined as a single constraint-expression derived from the introduced
51/// constraint-expressions [ ... ].
52///
53/// \param Params The template parameter list and optional requires-clause.
54///
55/// \param FD The underlying templated function declaration for a function
56/// template.
57static Expr *formAssociatedConstraints(TemplateParameterList *Params,
58 FunctionDecl *FD);
59}
60
61static Expr *clang::formAssociatedConstraints(TemplateParameterList *Params,
62 FunctionDecl *FD) {
63 // FIXME: Concepts: collect additional introduced constraint-expressions
64 assert(!FD && "Cannot collect constraints from function declaration yet.")(static_cast <bool> (!FD && "Cannot collect constraints from function declaration yet."
) ? void (0) : __assert_fail ("!FD && \"Cannot collect constraints from function declaration yet.\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 64, __extension__ __PRETTY_FUNCTION__))
;
65 return Params->getRequiresClause();
66}
67
68/// Determine whether the declaration found is acceptable as the name
69/// of a template and, if so, return that template declaration. Otherwise,
70/// returns NULL.
71static NamedDecl *isAcceptableTemplateName(ASTContext &Context,
72 NamedDecl *Orig,
73 bool AllowFunctionTemplates) {
74 NamedDecl *D = Orig->getUnderlyingDecl();
75
76 if (isa<TemplateDecl>(D)) {
77 if (!AllowFunctionTemplates && isa<FunctionTemplateDecl>(D))
78 return nullptr;
79
80 return Orig;
81 }
82
83 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) {
84 // C++ [temp.local]p1:
85 // Like normal (non-template) classes, class templates have an
86 // injected-class-name (Clause 9). The injected-class-name
87 // can be used with or without a template-argument-list. When
88 // it is used without a template-argument-list, it is
89 // equivalent to the injected-class-name followed by the
90 // template-parameters of the class template enclosed in
91 // <>. When it is used with a template-argument-list, it
92 // refers to the specified class template specialization,
93 // which could be the current specialization or another
94 // specialization.
95 if (Record->isInjectedClassName()) {
96 Record = cast<CXXRecordDecl>(Record->getDeclContext());
97 if (Record->getDescribedClassTemplate())
98 return Record->getDescribedClassTemplate();
99
100 if (ClassTemplateSpecializationDecl *Spec
101 = dyn_cast<ClassTemplateSpecializationDecl>(Record))
102 return Spec->getSpecializedTemplate();
103 }
104
105 return nullptr;
106 }
107
108 // 'using Dependent::foo;' can resolve to a template name.
109 // 'using typename Dependent::foo;' cannot (not even if 'foo' is an
110 // injected-class-name).
111 if (isa<UnresolvedUsingValueDecl>(D))
112 return D;
113
114 return nullptr;
115}
116
117void Sema::FilterAcceptableTemplateNames(LookupResult &R,
118 bool AllowFunctionTemplates) {
119 // The set of class templates we've already seen.
120 llvm::SmallPtrSet<ClassTemplateDecl *, 8> ClassTemplates;
121 LookupResult::Filter filter = R.makeFilter();
122 while (filter.hasNext()) {
123 NamedDecl *Orig = filter.next();
124 NamedDecl *Repl = isAcceptableTemplateName(Context, Orig,
125 AllowFunctionTemplates);
126 if (!Repl)
127 filter.erase();
128 else if (Repl != Orig) {
129
130 // C++ [temp.local]p3:
131 // A lookup that finds an injected-class-name (10.2) can result in an
132 // ambiguity in certain cases (for example, if it is found in more than
133 // one base class). If all of the injected-class-names that are found
134 // refer to specializations of the same class template, and if the name
135 // is used as a template-name, the reference refers to the class
136 // template itself and not a specialization thereof, and is not
137 // ambiguous.
138 if (ClassTemplateDecl *ClassTmpl = dyn_cast<ClassTemplateDecl>(Repl))
139 if (!ClassTemplates.insert(ClassTmpl).second) {
140 filter.erase();
141 continue;
142 }
143
144 // FIXME: we promote access to public here as a workaround to
145 // the fact that LookupResult doesn't let us remember that we
146 // found this template through a particular injected class name,
147 // which means we end up doing nasty things to the invariants.
148 // Pretending that access is public is *much* safer.
149 filter.replace(Repl, AS_public);
150 }
151 }
152 filter.done();
153}
154
155bool Sema::hasAnyAcceptableTemplateNames(LookupResult &R,
156 bool AllowFunctionTemplates) {
157 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I)
158 if (isAcceptableTemplateName(Context, *I, AllowFunctionTemplates))
159 return true;
160
161 return false;
162}
163
164TemplateNameKind Sema::isTemplateName(Scope *S,
165 CXXScopeSpec &SS,
166 bool hasTemplateKeyword,
167 const UnqualifiedId &Name,
168 ParsedType ObjectTypePtr,
169 bool EnteringContext,
170 TemplateTy &TemplateResult,
171 bool &MemberOfUnknownSpecialization) {
172 assert(getLangOpts().CPlusPlus && "No template names in C!")(static_cast <bool> (getLangOpts().CPlusPlus &&
"No template names in C!") ? void (0) : __assert_fail ("getLangOpts().CPlusPlus && \"No template names in C!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 172, __extension__ __PRETTY_FUNCTION__))
;
173
174 DeclarationName TName;
175 MemberOfUnknownSpecialization = false;
176
177 switch (Name.getKind()) {
178 case UnqualifiedIdKind::IK_Identifier:
179 TName = DeclarationName(Name.Identifier);
180 break;
181
182 case UnqualifiedIdKind::IK_OperatorFunctionId:
183 TName = Context.DeclarationNames.getCXXOperatorName(
184 Name.OperatorFunctionId.Operator);
185 break;
186
187 case UnqualifiedIdKind::IK_LiteralOperatorId:
188 TName = Context.DeclarationNames.getCXXLiteralOperatorName(Name.Identifier);
189 break;
190
191 default:
192 return TNK_Non_template;
193 }
194
195 QualType ObjectType = ObjectTypePtr.get();
196
197 LookupResult R(*this, TName, Name.getLocStart(), LookupOrdinaryName);
198 if (LookupTemplateName(R, S, SS, ObjectType, EnteringContext,
199 MemberOfUnknownSpecialization))
200 return TNK_Non_template;
201 if (R.empty()) return TNK_Non_template;
202 if (R.isAmbiguous()) {
203 // Suppress diagnostics; we'll redo this lookup later.
204 R.suppressDiagnostics();
205
206 // FIXME: we might have ambiguous templates, in which case we
207 // should at least parse them properly!
208 return TNK_Non_template;
209 }
210
211 TemplateName Template;
212 TemplateNameKind TemplateKind;
213
214 unsigned ResultCount = R.end() - R.begin();
215 if (ResultCount > 1) {
216 // We assume that we'll preserve the qualifier from a function
217 // template name in other ways.
218 Template = Context.getOverloadedTemplateName(R.begin(), R.end());
219 TemplateKind = TNK_Function_template;
220
221 // We'll do this lookup again later.
222 R.suppressDiagnostics();
223 } else if (isa<UnresolvedUsingValueDecl>((*R.begin())->getUnderlyingDecl())) {
224 // We don't yet know whether this is a template-name or not.
225 MemberOfUnknownSpecialization = true;
226 return TNK_Non_template;
227 } else {
228 TemplateDecl *TD = cast<TemplateDecl>((*R.begin())->getUnderlyingDecl());
229
230 if (SS.isSet() && !SS.isInvalid()) {
231 NestedNameSpecifier *Qualifier = SS.getScopeRep();
232 Template = Context.getQualifiedTemplateName(Qualifier,
233 hasTemplateKeyword, TD);
234 } else {
235 Template = TemplateName(TD);
236 }
237
238 if (isa<FunctionTemplateDecl>(TD)) {
239 TemplateKind = TNK_Function_template;
240
241 // We'll do this lookup again later.
242 R.suppressDiagnostics();
243 } else {
244 assert(isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) ||(static_cast <bool> (isa<ClassTemplateDecl>(TD) ||
isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl
>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl
>(TD)) ? void (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD)"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 246, __extension__ __PRETTY_FUNCTION__))
245 isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) ||(static_cast <bool> (isa<ClassTemplateDecl>(TD) ||
isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl
>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl
>(TD)) ? void (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD)"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 246, __extension__ __PRETTY_FUNCTION__))
246 isa<BuiltinTemplateDecl>(TD))(static_cast <bool> (isa<ClassTemplateDecl>(TD) ||
isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl
>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl
>(TD)) ? void (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD)"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 246, __extension__ __PRETTY_FUNCTION__))
;
247 TemplateKind =
248 isa<VarTemplateDecl>(TD) ? TNK_Var_template : TNK_Type_template;
249 }
250 }
251
252 TemplateResult = TemplateTy::make(Template);
253 return TemplateKind;
254}
255
256bool Sema::isDeductionGuideName(Scope *S, const IdentifierInfo &Name,
257 SourceLocation NameLoc,
258 ParsedTemplateTy *Template) {
259 CXXScopeSpec SS;
260 bool MemberOfUnknownSpecialization = false;
261
262 // We could use redeclaration lookup here, but we don't need to: the
263 // syntactic form of a deduction guide is enough to identify it even
264 // if we can't look up the template name at all.
265 LookupResult R(*this, DeclarationName(&Name), NameLoc, LookupOrdinaryName);
266 if (LookupTemplateName(R, S, SS, /*ObjectType*/ QualType(),
267 /*EnteringContext*/ false,
268 MemberOfUnknownSpecialization))
269 return false;
270
271 if (R.empty()) return false;
272 if (R.isAmbiguous()) {
273 // FIXME: Diagnose an ambiguity if we find at least one template.
274 R.suppressDiagnostics();
275 return false;
276 }
277
278 // We only treat template-names that name type templates as valid deduction
279 // guide names.
280 TemplateDecl *TD = R.getAsSingle<TemplateDecl>();
281 if (!TD || !getAsTypeTemplateDecl(TD))
282 return false;
283
284 if (Template)
285 *Template = TemplateTy::make(TemplateName(TD));
286 return true;
287}
288
289bool Sema::DiagnoseUnknownTemplateName(const IdentifierInfo &II,
290 SourceLocation IILoc,
291 Scope *S,
292 const CXXScopeSpec *SS,
293 TemplateTy &SuggestedTemplate,
294 TemplateNameKind &SuggestedKind) {
295 // We can't recover unless there's a dependent scope specifier preceding the
296 // template name.
297 // FIXME: Typo correction?
298 if (!SS || !SS->isSet() || !isDependentScopeSpecifier(*SS) ||
299 computeDeclContext(*SS))
300 return false;
301
302 // The code is missing a 'template' keyword prior to the dependent template
303 // name.
304 NestedNameSpecifier *Qualifier = (NestedNameSpecifier*)SS->getScopeRep();
305 Diag(IILoc, diag::err_template_kw_missing)
306 << Qualifier << II.getName()
307 << FixItHint::CreateInsertion(IILoc, "template ");
308 SuggestedTemplate
309 = TemplateTy::make(Context.getDependentTemplateName(Qualifier, &II));
310 SuggestedKind = TNK_Dependent_template_name;
311 return true;
312}
313
314bool Sema::LookupTemplateName(LookupResult &Found,
315 Scope *S, CXXScopeSpec &SS,
316 QualType ObjectType,
317 bool EnteringContext,
318 bool &MemberOfUnknownSpecialization,
319 SourceLocation TemplateKWLoc) {
320 // Determine where to perform name lookup
321 MemberOfUnknownSpecialization = false;
322 DeclContext *LookupCtx = nullptr;
323 bool IsDependent = false;
324 if (!ObjectType.isNull()) {
325 // This nested-name-specifier occurs in a member access expression, e.g.,
326 // x->B::f, and we are looking into the type of the object.
327 assert(!SS.isSet() && "ObjectType and scope specifier cannot coexist")(static_cast <bool> (!SS.isSet() && "ObjectType and scope specifier cannot coexist"
) ? void (0) : __assert_fail ("!SS.isSet() && \"ObjectType and scope specifier cannot coexist\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 327, __extension__ __PRETTY_FUNCTION__))
;
328 LookupCtx = computeDeclContext(ObjectType);
329 IsDependent = !LookupCtx;
330 assert((IsDependent || !ObjectType->isIncompleteType() ||(static_cast <bool> ((IsDependent || !ObjectType->isIncompleteType
() || ObjectType->castAs<TagType>()->isBeingDefined
()) && "Caller should have completed object type") ? void
(0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 332, __extension__ __PRETTY_FUNCTION__))
331 ObjectType->castAs<TagType>()->isBeingDefined()) &&(static_cast <bool> ((IsDependent || !ObjectType->isIncompleteType
() || ObjectType->castAs<TagType>()->isBeingDefined
()) && "Caller should have completed object type") ? void
(0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 332, __extension__ __PRETTY_FUNCTION__))
332 "Caller should have completed object type")(static_cast <bool> ((IsDependent || !ObjectType->isIncompleteType
() || ObjectType->castAs<TagType>()->isBeingDefined
()) && "Caller should have completed object type") ? void
(0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 332, __extension__ __PRETTY_FUNCTION__))
;
333
334 // Template names cannot appear inside an Objective-C class or object type.
335 if (ObjectType->isObjCObjectOrInterfaceType()) {
336 Found.clear();
337 return false;
338 }
339 } else if (SS.isSet()) {
340 // This nested-name-specifier occurs after another nested-name-specifier,
341 // so long into the context associated with the prior nested-name-specifier.
342 LookupCtx = computeDeclContext(SS, EnteringContext);
343 IsDependent = !LookupCtx;
344
345 // The declaration context must be complete.
346 if (LookupCtx && RequireCompleteDeclContext(SS, LookupCtx))
347 return true;
348 }
349
350 bool ObjectTypeSearchedInScope = false;
351 bool AllowFunctionTemplatesInLookup = true;
352 if (LookupCtx) {
353 // Perform "qualified" name lookup into the declaration context we
354 // computed, which is either the type of the base of a member access
355 // expression or the declaration context associated with a prior
356 // nested-name-specifier.
357 LookupQualifiedName(Found, LookupCtx);
358
359 // FIXME: The C++ standard does not clearly specify what happens in the
360 // case where the object type is dependent, and implementations vary. In
361 // Clang, we treat a name after a . or -> as a template-name if lookup
362 // finds a non-dependent member or member of the current instantiation that
363 // is a type template, or finds no such members and lookup in the context
364 // of the postfix-expression finds a type template. In the latter case, the
365 // name is nonetheless dependent, and we may resolve it to a member of an
366 // unknown specialization when we come to instantiate the template.
367 IsDependent |= Found.wasNotFoundInCurrentInstantiation();
368 }
369
370 if (!SS.isSet() && (ObjectType.isNull() || Found.empty())) {
371 // C++ [basic.lookup.classref]p1:
372 // In a class member access expression (5.2.5), if the . or -> token is
373 // immediately followed by an identifier followed by a <, the
374 // identifier must be looked up to determine whether the < is the
375 // beginning of a template argument list (14.2) or a less-than operator.
376 // The identifier is first looked up in the class of the object
377 // expression. If the identifier is not found, it is then looked up in
378 // the context of the entire postfix-expression and shall name a class
379 // template.
380 if (S)
381 LookupName(Found, S);
382
383 if (!ObjectType.isNull()) {
384 // FIXME: We should filter out all non-type templates here, particularly
385 // variable templates and concepts. But the exclusion of alias templates
386 // and template template parameters is a wording defect.
387 AllowFunctionTemplatesInLookup = false;
388 ObjectTypeSearchedInScope = true;
389 }
390
391 IsDependent |= Found.wasNotFoundInCurrentInstantiation();
392 }
393
394 if (Found.empty() && !IsDependent) {
395 // If we did not find any names, attempt to correct any typos.
396 DeclarationName Name = Found.getLookupName();
397 Found.clear();
398 // Simple filter callback that, for keywords, only accepts the C++ *_cast
399 auto FilterCCC = llvm::make_unique<CorrectionCandidateCallback>();
400 FilterCCC->WantTypeSpecifiers = false;
401 FilterCCC->WantExpressionKeywords = false;
402 FilterCCC->WantRemainingKeywords = false;
403 FilterCCC->WantCXXNamedCasts = true;
404 if (TypoCorrection Corrected = CorrectTypo(
405 Found.getLookupNameInfo(), Found.getLookupKind(), S, &SS,
406 std::move(FilterCCC), CTK_ErrorRecovery, LookupCtx)) {
407 Found.setLookupName(Corrected.getCorrection());
408 if (auto *ND = Corrected.getFoundDecl())
409 Found.addDecl(ND);
410 FilterAcceptableTemplateNames(Found);
411 if (!Found.empty()) {
412 if (LookupCtx) {
413 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
414 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
415 Name.getAsString() == CorrectedStr;
416 diagnoseTypo(Corrected, PDiag(diag::err_no_member_template_suggest)
417 << Name << LookupCtx << DroppedSpecifier
418 << SS.getRange());
419 } else {
420 diagnoseTypo(Corrected, PDiag(diag::err_no_template_suggest) << Name);
421 }
422 }
423 } else {
424 Found.setLookupName(Name);
425 }
426 }
427
428 NamedDecl *ExampleLookupResult =
429 Found.empty() ? nullptr : Found.getRepresentativeDecl();
430 FilterAcceptableTemplateNames(Found, AllowFunctionTemplatesInLookup);
431 if (Found.empty()) {
432 if (IsDependent) {
433 MemberOfUnknownSpecialization = true;
434 return false;
435 }
436
437 // If a 'template' keyword was used, a lookup that finds only non-template
438 // names is an error.
439 if (ExampleLookupResult && TemplateKWLoc.isValid()) {
440 Diag(Found.getNameLoc(), diag::err_template_kw_refers_to_non_template)
441 << Found.getLookupName() << SS.getRange();
442 Diag(ExampleLookupResult->getUnderlyingDecl()->getLocation(),
443 diag::note_template_kw_refers_to_non_template)
444 << Found.getLookupName();
445 return true;
446 }
447
448 return false;
449 }
450
451 if (S && !ObjectType.isNull() && !ObjectTypeSearchedInScope &&
452 !getLangOpts().CPlusPlus11) {
453 // C++03 [basic.lookup.classref]p1:
454 // [...] If the lookup in the class of the object expression finds a
455 // template, the name is also looked up in the context of the entire
456 // postfix-expression and [...]
457 //
458 // Note: C++11 does not perform this second lookup.
459 LookupResult FoundOuter(*this, Found.getLookupName(), Found.getNameLoc(),
460 LookupOrdinaryName);
461 LookupName(FoundOuter, S);
462 FilterAcceptableTemplateNames(FoundOuter, /*AllowFunctionTemplates=*/false);
463
464 if (FoundOuter.empty()) {
465 // - if the name is not found, the name found in the class of the
466 // object expression is used, otherwise
467 } else if (!FoundOuter.getAsSingle<ClassTemplateDecl>() ||
468 FoundOuter.isAmbiguous()) {
469 // - if the name is found in the context of the entire
470 // postfix-expression and does not name a class template, the name
471 // found in the class of the object expression is used, otherwise
472 FoundOuter.clear();
473 } else if (!Found.isSuppressingDiagnostics()) {
474 // - if the name found is a class template, it must refer to the same
475 // entity as the one found in the class of the object expression,
476 // otherwise the program is ill-formed.
477 if (!Found.isSingleResult() ||
478 Found.getFoundDecl()->getCanonicalDecl()
479 != FoundOuter.getFoundDecl()->getCanonicalDecl()) {
480 Diag(Found.getNameLoc(),
481 diag::ext_nested_name_member_ref_lookup_ambiguous)
482 << Found.getLookupName()
483 << ObjectType;
484 Diag(Found.getRepresentativeDecl()->getLocation(),
485 diag::note_ambig_member_ref_object_type)
486 << ObjectType;
487 Diag(FoundOuter.getFoundDecl()->getLocation(),
488 diag::note_ambig_member_ref_scope);
489
490 // Recover by taking the template that we found in the object
491 // expression's type.
492 }
493 }
494 }
495
496 return false;
497}
498
499void Sema::diagnoseExprIntendedAsTemplateName(Scope *S, ExprResult TemplateName,
500 SourceLocation Less,
501 SourceLocation Greater) {
502 if (TemplateName.isInvalid())
503 return;
504
505 DeclarationNameInfo NameInfo;
506 CXXScopeSpec SS;
507 LookupNameKind LookupKind;
508
509 DeclContext *LookupCtx = nullptr;
510 NamedDecl *Found = nullptr;
511 bool MissingTemplateKeyword = false;
512
513 // Figure out what name we looked up.
514 if (auto *DRE = dyn_cast<DeclRefExpr>(TemplateName.get())) {
515 NameInfo = DRE->getNameInfo();
516 SS.Adopt(DRE->getQualifierLoc());
517 LookupKind = LookupOrdinaryName;
518 Found = DRE->getFoundDecl();
519 } else if (auto *ME = dyn_cast<MemberExpr>(TemplateName.get())) {
520 NameInfo = ME->getMemberNameInfo();
521 SS.Adopt(ME->getQualifierLoc());
522 LookupKind = LookupMemberName;
523 LookupCtx = ME->getBase()->getType()->getAsCXXRecordDecl();
524 Found = ME->getMemberDecl();
525 } else if (auto *DSDRE =
526 dyn_cast<DependentScopeDeclRefExpr>(TemplateName.get())) {
527 NameInfo = DSDRE->getNameInfo();
528 SS.Adopt(DSDRE->getQualifierLoc());
529 MissingTemplateKeyword = true;
530 } else if (auto *DSME =
531 dyn_cast<CXXDependentScopeMemberExpr>(TemplateName.get())) {
532 NameInfo = DSME->getMemberNameInfo();
533 SS.Adopt(DSME->getQualifierLoc());
534 MissingTemplateKeyword = true;
535 } else {
536 llvm_unreachable("unexpected kind of potential template name")::llvm::llvm_unreachable_internal("unexpected kind of potential template name"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 536)
;
537 }
538
539 // If this is a dependent-scope lookup, diagnose that the 'template' keyword
540 // was missing.
541 if (MissingTemplateKeyword) {
542 Diag(NameInfo.getLocStart(), diag::err_template_kw_missing)
543 << "" << NameInfo.getName().getAsString()
544 << SourceRange(Less, Greater);
545 return;
546 }
547
548 // Try to correct the name by looking for templates and C++ named casts.
549 struct TemplateCandidateFilter : CorrectionCandidateCallback {
550 TemplateCandidateFilter() {
551 WantTypeSpecifiers = false;
552 WantExpressionKeywords = false;
553 WantRemainingKeywords = false;
554 WantCXXNamedCasts = true;
555 };
556 bool ValidateCandidate(const TypoCorrection &Candidate) override {
557 if (auto *ND = Candidate.getCorrectionDecl())
558 return isAcceptableTemplateName(ND->getASTContext(), ND, true);
559 return Candidate.isKeyword();
560 }
561 };
562
563 DeclarationName Name = NameInfo.getName();
564 if (TypoCorrection Corrected =
565 CorrectTypo(NameInfo, LookupKind, S, &SS,
566 llvm::make_unique<TemplateCandidateFilter>(),
567 CTK_ErrorRecovery, LookupCtx)) {
568 auto *ND = Corrected.getFoundDecl();
569 if (ND)
570 ND = isAcceptableTemplateName(Context, ND,
571 /*AllowFunctionTemplates*/ true);
572 if (ND || Corrected.isKeyword()) {
573 if (LookupCtx) {
574 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
575 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
576 Name.getAsString() == CorrectedStr;
577 diagnoseTypo(Corrected,
578 PDiag(diag::err_non_template_in_member_template_id_suggest)
579 << Name << LookupCtx << DroppedSpecifier
580 << SS.getRange(), false);
581 } else {
582 diagnoseTypo(Corrected,
583 PDiag(diag::err_non_template_in_template_id_suggest)
584 << Name, false);
585 }
586 if (Found)
587 Diag(Found->getLocation(),
588 diag::note_non_template_in_template_id_found);
589 return;
590 }
591 }
592
593 Diag(NameInfo.getLoc(), diag::err_non_template_in_template_id)
594 << Name << SourceRange(Less, Greater);
595 if (Found)
596 Diag(Found->getLocation(), diag::note_non_template_in_template_id_found);
597}
598
599/// ActOnDependentIdExpression - Handle a dependent id-expression that
600/// was just parsed. This is only possible with an explicit scope
601/// specifier naming a dependent type.
602ExprResult
603Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS,
604 SourceLocation TemplateKWLoc,
605 const DeclarationNameInfo &NameInfo,
606 bool isAddressOfOperand,
607 const TemplateArgumentListInfo *TemplateArgs) {
608 DeclContext *DC = getFunctionLevelDeclContext();
609
610 // C++11 [expr.prim.general]p12:
611 // An id-expression that denotes a non-static data member or non-static
612 // member function of a class can only be used:
613 // (...)
614 // - if that id-expression denotes a non-static data member and it
615 // appears in an unevaluated operand.
616 //
617 // If this might be the case, form a DependentScopeDeclRefExpr instead of a
618 // CXXDependentScopeMemberExpr. The former can instantiate to either
619 // DeclRefExpr or MemberExpr depending on lookup results, while the latter is
620 // always a MemberExpr.
621 bool MightBeCxx11UnevalField =
622 getLangOpts().CPlusPlus11 && isUnevaluatedContext();
623
624 // Check if the nested name specifier is an enum type.
625 bool IsEnum = false;
626 if (NestedNameSpecifier *NNS = SS.getScopeRep())
627 IsEnum = dyn_cast_or_null<EnumType>(NNS->getAsType());
628
629 if (!MightBeCxx11UnevalField && !isAddressOfOperand && !IsEnum &&
630 isa<CXXMethodDecl>(DC) && cast<CXXMethodDecl>(DC)->isInstance()) {
631 QualType ThisType = cast<CXXMethodDecl>(DC)->getThisType(Context);
632
633 // Since the 'this' expression is synthesized, we don't need to
634 // perform the double-lookup check.
635 NamedDecl *FirstQualifierInScope = nullptr;
636
637 return CXXDependentScopeMemberExpr::Create(
638 Context, /*This*/ nullptr, ThisType, /*IsArrow*/ true,
639 /*Op*/ SourceLocation(), SS.getWithLocInContext(Context), TemplateKWLoc,
640 FirstQualifierInScope, NameInfo, TemplateArgs);
641 }
642
643 return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs);
644}
645
646ExprResult
647Sema::BuildDependentDeclRefExpr(const CXXScopeSpec &SS,
648 SourceLocation TemplateKWLoc,
649 const DeclarationNameInfo &NameInfo,
650 const TemplateArgumentListInfo *TemplateArgs) {
651 return DependentScopeDeclRefExpr::Create(
652 Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo,
653 TemplateArgs);
654}
655
656
657/// Determine whether we would be unable to instantiate this template (because
658/// it either has no definition, or is in the process of being instantiated).
659bool Sema::DiagnoseUninstantiableTemplate(SourceLocation PointOfInstantiation,
660 NamedDecl *Instantiation,
661 bool InstantiatedFromMember,
662 const NamedDecl *Pattern,
663 const NamedDecl *PatternDef,
664 TemplateSpecializationKind TSK,
665 bool Complain /*= true*/) {
666 assert(isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) ||(static_cast <bool> (isa<TagDecl>(Instantiation) ||
isa<FunctionDecl>(Instantiation) || isa<VarDecl>
(Instantiation)) ? void (0) : __assert_fail ("isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) || isa<VarDecl>(Instantiation)"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 667, __extension__ __PRETTY_FUNCTION__))
667 isa<VarDecl>(Instantiation))(static_cast <bool> (isa<TagDecl>(Instantiation) ||
isa<FunctionDecl>(Instantiation) || isa<VarDecl>
(Instantiation)) ? void (0) : __assert_fail ("isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) || isa<VarDecl>(Instantiation)"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 667, __extension__ __PRETTY_FUNCTION__))
;
668
669 bool IsEntityBeingDefined = false;
670 if (const TagDecl *TD = dyn_cast_or_null<TagDecl>(PatternDef))
671 IsEntityBeingDefined = TD->isBeingDefined();
672
673 if (PatternDef && !IsEntityBeingDefined) {
674 NamedDecl *SuggestedDef = nullptr;
675 if (!hasVisibleDefinition(const_cast<NamedDecl*>(PatternDef), &SuggestedDef,
676 /*OnlyNeedComplete*/false)) {
677 // If we're allowed to diagnose this and recover, do so.
678 bool Recover = Complain && !isSFINAEContext();
679 if (Complain)
680 diagnoseMissingImport(PointOfInstantiation, SuggestedDef,
681 Sema::MissingImportKind::Definition, Recover);
682 return !Recover;
683 }
684 return false;
685 }
686
687 if (!Complain || (PatternDef && PatternDef->isInvalidDecl()))
688 return true;
689
690 llvm::Optional<unsigned> Note;
691 QualType InstantiationTy;
692 if (TagDecl *TD = dyn_cast<TagDecl>(Instantiation))
693 InstantiationTy = Context.getTypeDeclType(TD);
694 if (PatternDef) {
695 Diag(PointOfInstantiation,
696 diag::err_template_instantiate_within_definition)
697 << /*implicit|explicit*/(TSK != TSK_ImplicitInstantiation)
698 << InstantiationTy;
699 // Not much point in noting the template declaration here, since
700 // we're lexically inside it.
701 Instantiation->setInvalidDecl();
702 } else if (InstantiatedFromMember) {
703 if (isa<FunctionDecl>(Instantiation)) {
704 Diag(PointOfInstantiation,
705 diag::err_explicit_instantiation_undefined_member)
706 << /*member function*/ 1 << Instantiation->getDeclName()
707 << Instantiation->getDeclContext();
708 Note = diag::note_explicit_instantiation_here;
709 } else {
710 assert(isa<TagDecl>(Instantiation) && "Must be a TagDecl!")(static_cast <bool> (isa<TagDecl>(Instantiation) &&
"Must be a TagDecl!") ? void (0) : __assert_fail ("isa<TagDecl>(Instantiation) && \"Must be a TagDecl!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 710, __extension__ __PRETTY_FUNCTION__))
;
711 Diag(PointOfInstantiation,
712 diag::err_implicit_instantiate_member_undefined)
713 << InstantiationTy;
714 Note = diag::note_member_declared_at;
715 }
716 } else {
717 if (isa<FunctionDecl>(Instantiation)) {
718 Diag(PointOfInstantiation,
719 diag::err_explicit_instantiation_undefined_func_template)
720 << Pattern;
721 Note = diag::note_explicit_instantiation_here;
722 } else if (isa<TagDecl>(Instantiation)) {
723 Diag(PointOfInstantiation, diag::err_template_instantiate_undefined)
724 << (TSK != TSK_ImplicitInstantiation)
725 << InstantiationTy;
726 Note = diag::note_template_decl_here;
727 } else {
728 assert(isa<VarDecl>(Instantiation) && "Must be a VarDecl!")(static_cast <bool> (isa<VarDecl>(Instantiation) &&
"Must be a VarDecl!") ? void (0) : __assert_fail ("isa<VarDecl>(Instantiation) && \"Must be a VarDecl!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 728, __extension__ __PRETTY_FUNCTION__))
;
729 if (isa<VarTemplateSpecializationDecl>(Instantiation)) {
730 Diag(PointOfInstantiation,
731 diag::err_explicit_instantiation_undefined_var_template)
732 << Instantiation;
733 Instantiation->setInvalidDecl();
734 } else
735 Diag(PointOfInstantiation,
736 diag::err_explicit_instantiation_undefined_member)
737 << /*static data member*/ 2 << Instantiation->getDeclName()
738 << Instantiation->getDeclContext();
739 Note = diag::note_explicit_instantiation_here;
740 }
741 }
742 if (Note) // Diagnostics were emitted.
743 Diag(Pattern->getLocation(), Note.getValue());
744
745 // In general, Instantiation isn't marked invalid to get more than one
746 // error for multiple undefined instantiations. But the code that does
747 // explicit declaration -> explicit definition conversion can't handle
748 // invalid declarations, so mark as invalid in that case.
749 if (TSK == TSK_ExplicitInstantiationDeclaration)
750 Instantiation->setInvalidDecl();
751 return true;
752}
753
754/// DiagnoseTemplateParameterShadow - Produce a diagnostic complaining
755/// that the template parameter 'PrevDecl' is being shadowed by a new
756/// declaration at location Loc. Returns true to indicate that this is
757/// an error, and false otherwise.
758void Sema::DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl) {
759 assert(PrevDecl->isTemplateParameter() && "Not a template parameter")(static_cast <bool> (PrevDecl->isTemplateParameter()
&& "Not a template parameter") ? void (0) : __assert_fail
("PrevDecl->isTemplateParameter() && \"Not a template parameter\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 759, __extension__ __PRETTY_FUNCTION__))
;
760
761 // Microsoft Visual C++ permits template parameters to be shadowed.
762 if (getLangOpts().MicrosoftExt)
763 return;
764
765 // C++ [temp.local]p4:
766 // A template-parameter shall not be redeclared within its
767 // scope (including nested scopes).
768 Diag(Loc, diag::err_template_param_shadow)
769 << cast<NamedDecl>(PrevDecl)->getDeclName();
770 Diag(PrevDecl->getLocation(), diag::note_template_param_here);
771}
772
773/// AdjustDeclIfTemplate - If the given decl happens to be a template, reset
774/// the parameter D to reference the templated declaration and return a pointer
775/// to the template declaration. Otherwise, do nothing to D and return null.
776TemplateDecl *Sema::AdjustDeclIfTemplate(Decl *&D) {
777 if (TemplateDecl *Temp = dyn_cast_or_null<TemplateDecl>(D)) {
778 D = Temp->getTemplatedDecl();
779 return Temp;
780 }
781 return nullptr;
782}
783
784ParsedTemplateArgument ParsedTemplateArgument::getTemplatePackExpansion(
785 SourceLocation EllipsisLoc) const {
786 assert(Kind == Template &&(static_cast <bool> (Kind == Template && "Only template template arguments can be pack expansions here"
) ? void (0) : __assert_fail ("Kind == Template && \"Only template template arguments can be pack expansions here\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 787, __extension__ __PRETTY_FUNCTION__))
787 "Only template template arguments can be pack expansions here")(static_cast <bool> (Kind == Template && "Only template template arguments can be pack expansions here"
) ? void (0) : __assert_fail ("Kind == Template && \"Only template template arguments can be pack expansions here\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 787, __extension__ __PRETTY_FUNCTION__))
;
788 assert(getAsTemplate().get().containsUnexpandedParameterPack() &&(static_cast <bool> (getAsTemplate().get().containsUnexpandedParameterPack
() && "Template template argument pack expansion without packs"
) ? void (0) : __assert_fail ("getAsTemplate().get().containsUnexpandedParameterPack() && \"Template template argument pack expansion without packs\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 789, __extension__ __PRETTY_FUNCTION__))
789 "Template template argument pack expansion without packs")(static_cast <bool> (getAsTemplate().get().containsUnexpandedParameterPack
() && "Template template argument pack expansion without packs"
) ? void (0) : __assert_fail ("getAsTemplate().get().containsUnexpandedParameterPack() && \"Template template argument pack expansion without packs\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 789, __extension__ __PRETTY_FUNCTION__))
;
790 ParsedTemplateArgument Result(*this);
791 Result.EllipsisLoc = EllipsisLoc;
792 return Result;
793}
794
795static TemplateArgumentLoc translateTemplateArgument(Sema &SemaRef,
796 const ParsedTemplateArgument &Arg) {
797
798 switch (Arg.getKind()) {
799 case ParsedTemplateArgument::Type: {
800 TypeSourceInfo *DI;
801 QualType T = SemaRef.GetTypeFromParser(Arg.getAsType(), &DI);
802 if (!DI)
803 DI = SemaRef.Context.getTrivialTypeSourceInfo(T, Arg.getLocation());
804 return TemplateArgumentLoc(TemplateArgument(T), DI);
805 }
806
807 case ParsedTemplateArgument::NonType: {
808 Expr *E = static_cast<Expr *>(Arg.getAsExpr());
809 return TemplateArgumentLoc(TemplateArgument(E), E);
810 }
811
812 case ParsedTemplateArgument::Template: {
813 TemplateName Template = Arg.getAsTemplate().get();
814 TemplateArgument TArg;
815 if (Arg.getEllipsisLoc().isValid())
816 TArg = TemplateArgument(Template, Optional<unsigned int>());
817 else
818 TArg = Template;
819 return TemplateArgumentLoc(TArg,
820 Arg.getScopeSpec().getWithLocInContext(
821 SemaRef.Context),
822 Arg.getLocation(),
823 Arg.getEllipsisLoc());
824 }
825 }
826
827 llvm_unreachable("Unhandled parsed template argument")::llvm::llvm_unreachable_internal("Unhandled parsed template argument"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 827)
;
828}
829
830/// Translates template arguments as provided by the parser
831/// into template arguments used by semantic analysis.
832void Sema::translateTemplateArguments(const ASTTemplateArgsPtr &TemplateArgsIn,
833 TemplateArgumentListInfo &TemplateArgs) {
834 for (unsigned I = 0, Last = TemplateArgsIn.size(); I != Last; ++I)
835 TemplateArgs.addArgument(translateTemplateArgument(*this,
836 TemplateArgsIn[I]));
837}
838
839static void maybeDiagnoseTemplateParameterShadow(Sema &SemaRef, Scope *S,
840 SourceLocation Loc,
841 IdentifierInfo *Name) {
842 NamedDecl *PrevDecl = SemaRef.LookupSingleName(
843 S, Name, Loc, Sema::LookupOrdinaryName, Sema::ForVisibleRedeclaration);
844 if (PrevDecl && PrevDecl->isTemplateParameter())
845 SemaRef.DiagnoseTemplateParameterShadow(Loc, PrevDecl);
846}
847
848/// Convert a parsed type into a parsed template argument. This is mostly
849/// trivial, except that we may have parsed a C++17 deduced class template
850/// specialization type, in which case we should form a template template
851/// argument instead of a type template argument.
852ParsedTemplateArgument Sema::ActOnTemplateTypeArgument(TypeResult ParsedType) {
853 TypeSourceInfo *TInfo;
854 QualType T = GetTypeFromParser(ParsedType.get(), &TInfo);
855 if (T.isNull())
856 return ParsedTemplateArgument();
857 assert(TInfo && "template argument with no location")(static_cast <bool> (TInfo && "template argument with no location"
) ? void (0) : __assert_fail ("TInfo && \"template argument with no location\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 857, __extension__ __PRETTY_FUNCTION__))
;
858
859 // If we might have formed a deduced template specialization type, convert
860 // it to a template template argument.
861 if (getLangOpts().CPlusPlus17) {
862 TypeLoc TL = TInfo->getTypeLoc();
863 SourceLocation EllipsisLoc;
864 if (auto PET = TL.getAs<PackExpansionTypeLoc>()) {
865 EllipsisLoc = PET.getEllipsisLoc();
866 TL = PET.getPatternLoc();
867 }
868
869 CXXScopeSpec SS;
870 if (auto ET = TL.getAs<ElaboratedTypeLoc>()) {
871 SS.Adopt(ET.getQualifierLoc());
872 TL = ET.getNamedTypeLoc();
873 }
874
875 if (auto DTST = TL.getAs<DeducedTemplateSpecializationTypeLoc>()) {
876 TemplateName Name = DTST.getTypePtr()->getTemplateName();
877 if (SS.isSet())
878 Name = Context.getQualifiedTemplateName(SS.getScopeRep(),
879 /*HasTemplateKeyword*/ false,
880 Name.getAsTemplateDecl());
881 ParsedTemplateArgument Result(SS, TemplateTy::make(Name),
882 DTST.getTemplateNameLoc());
883 if (EllipsisLoc.isValid())
884 Result = Result.getTemplatePackExpansion(EllipsisLoc);
885 return Result;
886 }
887 }
888
889 // This is a normal type template argument. Note, if the type template
890 // argument is an injected-class-name for a template, it has a dual nature
891 // and can be used as either a type or a template. We handle that in
892 // convertTypeTemplateArgumentToTemplate.
893 return ParsedTemplateArgument(ParsedTemplateArgument::Type,
894 ParsedType.get().getAsOpaquePtr(),
895 TInfo->getTypeLoc().getLocStart());
896}
897
898/// ActOnTypeParameter - Called when a C++ template type parameter
899/// (e.g., "typename T") has been parsed. Typename specifies whether
900/// the keyword "typename" was used to declare the type parameter
901/// (otherwise, "class" was used), and KeyLoc is the location of the
902/// "class" or "typename" keyword. ParamName is the name of the
903/// parameter (NULL indicates an unnamed template parameter) and
904/// ParamNameLoc is the location of the parameter name (if any).
905/// If the type parameter has a default argument, it will be added
906/// later via ActOnTypeParameterDefault.
907NamedDecl *Sema::ActOnTypeParameter(Scope *S, bool Typename,
908 SourceLocation EllipsisLoc,
909 SourceLocation KeyLoc,
910 IdentifierInfo *ParamName,
911 SourceLocation ParamNameLoc,
912 unsigned Depth, unsigned Position,
913 SourceLocation EqualLoc,
914 ParsedType DefaultArg) {
915 assert(S->isTemplateParamScope() &&(static_cast <bool> (S->isTemplateParamScope() &&
"Template type parameter not in template parameter scope!") ?
void (0) : __assert_fail ("S->isTemplateParamScope() && \"Template type parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 916, __extension__ __PRETTY_FUNCTION__))
916 "Template type parameter not in template parameter scope!")(static_cast <bool> (S->isTemplateParamScope() &&
"Template type parameter not in template parameter scope!") ?
void (0) : __assert_fail ("S->isTemplateParamScope() && \"Template type parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 916, __extension__ __PRETTY_FUNCTION__))
;
917
918 SourceLocation Loc = ParamNameLoc;
919 if (!ParamName)
920 Loc = KeyLoc;
921
922 bool IsParameterPack = EllipsisLoc.isValid();
923 TemplateTypeParmDecl *Param
924 = TemplateTypeParmDecl::Create(Context, Context.getTranslationUnitDecl(),
925 KeyLoc, Loc, Depth, Position, ParamName,
926 Typename, IsParameterPack);
927 Param->setAccess(AS_public);
928
929 if (ParamName) {
930 maybeDiagnoseTemplateParameterShadow(*this, S, ParamNameLoc, ParamName);
931
932 // Add the template parameter into the current scope.
933 S->AddDecl(Param);
934 IdResolver.AddDecl(Param);
935 }
936
937 // C++0x [temp.param]p9:
938 // A default template-argument may be specified for any kind of
939 // template-parameter that is not a template parameter pack.
940 if (DefaultArg && IsParameterPack) {
941 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
942 DefaultArg = nullptr;
943 }
944
945 // Handle the default argument, if provided.
946 if (DefaultArg) {
947 TypeSourceInfo *DefaultTInfo;
948 GetTypeFromParser(DefaultArg, &DefaultTInfo);
949
950 assert(DefaultTInfo && "expected source information for type")(static_cast <bool> (DefaultTInfo && "expected source information for type"
) ? void (0) : __assert_fail ("DefaultTInfo && \"expected source information for type\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 950, __extension__ __PRETTY_FUNCTION__))
;
951
952 // Check for unexpanded parameter packs.
953 if (DiagnoseUnexpandedParameterPack(Loc, DefaultTInfo,
954 UPPC_DefaultArgument))
955 return Param;
956
957 // Check the template argument itself.
958 if (CheckTemplateArgument(Param, DefaultTInfo)) {
959 Param->setInvalidDecl();
960 return Param;
961 }
962
963 Param->setDefaultArgument(DefaultTInfo);
964 }
965
966 return Param;
967}
968
969/// Check that the type of a non-type template parameter is
970/// well-formed.
971///
972/// \returns the (possibly-promoted) parameter type if valid;
973/// otherwise, produces a diagnostic and returns a NULL type.
974QualType Sema::CheckNonTypeTemplateParameterType(TypeSourceInfo *&TSI,
975 SourceLocation Loc) {
976 if (TSI->getType()->isUndeducedType()) {
977 // C++1z [temp.dep.expr]p3:
978 // An id-expression is type-dependent if it contains
979 // - an identifier associated by name lookup with a non-type
980 // template-parameter declared with a type that contains a
981 // placeholder type (7.1.7.4),
982 TSI = SubstAutoTypeSourceInfo(TSI, Context.DependentTy);
983 }
984
985 return CheckNonTypeTemplateParameterType(TSI->getType(), Loc);
986}
987
988QualType Sema::CheckNonTypeTemplateParameterType(QualType T,
989 SourceLocation Loc) {
990 // We don't allow variably-modified types as the type of non-type template
991 // parameters.
992 if (T->isVariablyModifiedType()) {
993 Diag(Loc, diag::err_variably_modified_nontype_template_param)
994 << T;
995 return QualType();
996 }
997
998 // C++ [temp.param]p4:
999 //
1000 // A non-type template-parameter shall have one of the following
1001 // (optionally cv-qualified) types:
1002 //
1003 // -- integral or enumeration type,
1004 if (T->isIntegralOrEnumerationType() ||
1005 // -- pointer to object or pointer to function,
1006 T->isPointerType() ||
1007 // -- reference to object or reference to function,
1008 T->isReferenceType() ||
1009 // -- pointer to member,
1010 T->isMemberPointerType() ||
1011 // -- std::nullptr_t.
1012 T->isNullPtrType() ||
1013 // If T is a dependent type, we can't do the check now, so we
1014 // assume that it is well-formed.
1015 T->isDependentType() ||
1016 // Allow use of auto in template parameter declarations.
1017 T->isUndeducedType()) {
1018 // C++ [temp.param]p5: The top-level cv-qualifiers on the template-parameter
1019 // are ignored when determining its type.
1020 return T.getUnqualifiedType();
1021 }
1022
1023 // C++ [temp.param]p8:
1024 //
1025 // A non-type template-parameter of type "array of T" or
1026 // "function returning T" is adjusted to be of type "pointer to
1027 // T" or "pointer to function returning T", respectively.
1028 else if (T->isArrayType() || T->isFunctionType())
1029 return Context.getDecayedType(T);
1030
1031 Diag(Loc, diag::err_template_nontype_parm_bad_type)
1032 << T;
1033
1034 return QualType();
1035}
1036
1037NamedDecl *Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
1038 unsigned Depth,
1039 unsigned Position,
1040 SourceLocation EqualLoc,
1041 Expr *Default) {
1042 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
1043
1044 // Check that we have valid decl-specifiers specified.
1045 auto CheckValidDeclSpecifiers = [this, &D] {
1046 // C++ [temp.param]
1047 // p1
1048 // template-parameter:
1049 // ...
1050 // parameter-declaration
1051 // p2
1052 // ... A storage class shall not be specified in a template-parameter
1053 // declaration.
1054 // [dcl.typedef]p1:
1055 // The typedef specifier [...] shall not be used in the decl-specifier-seq
1056 // of a parameter-declaration
1057 const DeclSpec &DS = D.getDeclSpec();
1058 auto EmitDiag = [this](SourceLocation Loc) {
1059 Diag(Loc, diag::err_invalid_decl_specifier_in_nontype_parm)
1060 << FixItHint::CreateRemoval(Loc);
1061 };
1062 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified)
1063 EmitDiag(DS.getStorageClassSpecLoc());
1064
1065 if (DS.getThreadStorageClassSpec() != TSCS_unspecified)
1066 EmitDiag(DS.getThreadStorageClassSpecLoc());
1067
1068 // [dcl.inline]p1:
1069 // The inline specifier can be applied only to the declaration or
1070 // definition of a variable or function.
1071
1072 if (DS.isInlineSpecified())
1073 EmitDiag(DS.getInlineSpecLoc());
1074
1075 // [dcl.constexpr]p1:
1076 // The constexpr specifier shall be applied only to the definition of a
1077 // variable or variable template or the declaration of a function or
1078 // function template.
1079
1080 if (DS.isConstexprSpecified())
1081 EmitDiag(DS.getConstexprSpecLoc());
1082
1083 // [dcl.fct.spec]p1:
1084 // Function-specifiers can be used only in function declarations.
1085
1086 if (DS.isVirtualSpecified())
1087 EmitDiag(DS.getVirtualSpecLoc());
1088
1089 if (DS.isExplicitSpecified())
1090 EmitDiag(DS.getExplicitSpecLoc());
1091
1092 if (DS.isNoreturnSpecified())
1093 EmitDiag(DS.getNoreturnSpecLoc());
1094 };
1095
1096 CheckValidDeclSpecifiers();
1097
1098 if (TInfo->getType()->isUndeducedType()) {
1099 Diag(D.getIdentifierLoc(),
1100 diag::warn_cxx14_compat_template_nontype_parm_auto_type)
1101 << QualType(TInfo->getType()->getContainedAutoType(), 0);
1102 }
1103
1104 assert(S->isTemplateParamScope() &&(static_cast <bool> (S->isTemplateParamScope() &&
"Non-type template parameter not in template parameter scope!"
) ? void (0) : __assert_fail ("S->isTemplateParamScope() && \"Non-type template parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1105, __extension__ __PRETTY_FUNCTION__))
1105 "Non-type template parameter not in template parameter scope!")(static_cast <bool> (S->isTemplateParamScope() &&
"Non-type template parameter not in template parameter scope!"
) ? void (0) : __assert_fail ("S->isTemplateParamScope() && \"Non-type template parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1105, __extension__ __PRETTY_FUNCTION__))
;
1106 bool Invalid = false;
1107
1108 QualType T = CheckNonTypeTemplateParameterType(TInfo, D.getIdentifierLoc());
1109 if (T.isNull()) {
1110 T = Context.IntTy; // Recover with an 'int' type.
1111 Invalid = true;
1112 }
1113
1114 IdentifierInfo *ParamName = D.getIdentifier();
1115 bool IsParameterPack = D.hasEllipsis();
1116 NonTypeTemplateParmDecl *Param
1117 = NonTypeTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(),
1118 D.getLocStart(),
1119 D.getIdentifierLoc(),
1120 Depth, Position, ParamName, T,
1121 IsParameterPack, TInfo);
1122 Param->setAccess(AS_public);
1123
1124 if (Invalid)
1125 Param->setInvalidDecl();
1126
1127 if (ParamName) {
1128 maybeDiagnoseTemplateParameterShadow(*this, S, D.getIdentifierLoc(),
1129 ParamName);
1130
1131 // Add the template parameter into the current scope.
1132 S->AddDecl(Param);
1133 IdResolver.AddDecl(Param);
1134 }
1135
1136 // C++0x [temp.param]p9:
1137 // A default template-argument may be specified for any kind of
1138 // template-parameter that is not a template parameter pack.
1139 if (Default && IsParameterPack) {
1140 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
1141 Default = nullptr;
1142 }
1143
1144 // Check the well-formedness of the default template argument, if provided.
1145 if (Default) {
1146 // Check for unexpanded parameter packs.
1147 if (DiagnoseUnexpandedParameterPack(Default, UPPC_DefaultArgument))
1148 return Param;
1149
1150 TemplateArgument Converted;
1151 ExprResult DefaultRes =
1152 CheckTemplateArgument(Param, Param->getType(), Default, Converted);
1153 if (DefaultRes.isInvalid()) {
1154 Param->setInvalidDecl();
1155 return Param;
1156 }
1157 Default = DefaultRes.get();
1158
1159 Param->setDefaultArgument(Default);
1160 }
1161
1162 return Param;
1163}
1164
1165/// ActOnTemplateTemplateParameter - Called when a C++ template template
1166/// parameter (e.g. T in template <template \<typename> class T> class array)
1167/// has been parsed. S is the current scope.
1168NamedDecl *Sema::ActOnTemplateTemplateParameter(Scope* S,
1169 SourceLocation TmpLoc,
1170 TemplateParameterList *Params,
1171 SourceLocation EllipsisLoc,
1172 IdentifierInfo *Name,
1173 SourceLocation NameLoc,
1174 unsigned Depth,
1175 unsigned Position,
1176 SourceLocation EqualLoc,
1177 ParsedTemplateArgument Default) {
1178 assert(S->isTemplateParamScope() &&(static_cast <bool> (S->isTemplateParamScope() &&
"Template template parameter not in template parameter scope!"
) ? void (0) : __assert_fail ("S->isTemplateParamScope() && \"Template template parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1179, __extension__ __PRETTY_FUNCTION__))
1179 "Template template parameter not in template parameter scope!")(static_cast <bool> (S->isTemplateParamScope() &&
"Template template parameter not in template parameter scope!"
) ? void (0) : __assert_fail ("S->isTemplateParamScope() && \"Template template parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1179, __extension__ __PRETTY_FUNCTION__))
;
1180
1181 // Construct the parameter object.
1182 bool IsParameterPack = EllipsisLoc.isValid();
1183 TemplateTemplateParmDecl *Param =
1184 TemplateTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(),
1185 NameLoc.isInvalid()? TmpLoc : NameLoc,
1186 Depth, Position, IsParameterPack,
1187 Name, Params);
1188 Param->setAccess(AS_public);
1189
1190 // If the template template parameter has a name, then link the identifier
1191 // into the scope and lookup mechanisms.
1192 if (Name) {
1193 maybeDiagnoseTemplateParameterShadow(*this, S, NameLoc, Name);
1194
1195 S->AddDecl(Param);
1196 IdResolver.AddDecl(Param);
1197 }
1198
1199 if (Params->size() == 0) {
1200 Diag(Param->getLocation(), diag::err_template_template_parm_no_parms)
1201 << SourceRange(Params->getLAngleLoc(), Params->getRAngleLoc());
1202 Param->setInvalidDecl();
1203 }
1204
1205 // C++0x [temp.param]p9:
1206 // A default template-argument may be specified for any kind of
1207 // template-parameter that is not a template parameter pack.
1208 if (IsParameterPack && !Default.isInvalid()) {
1209 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
1210 Default = ParsedTemplateArgument();
1211 }
1212
1213 if (!Default.isInvalid()) {
1214 // Check only that we have a template template argument. We don't want to
1215 // try to check well-formedness now, because our template template parameter
1216 // might have dependent types in its template parameters, which we wouldn't
1217 // be able to match now.
1218 //
1219 // If none of the template template parameter's template arguments mention
1220 // other template parameters, we could actually perform more checking here.
1221 // However, it isn't worth doing.
1222 TemplateArgumentLoc DefaultArg = translateTemplateArgument(*this, Default);
1223 if (DefaultArg.getArgument().getAsTemplate().isNull()) {
1224 Diag(DefaultArg.getLocation(), diag::err_template_arg_not_valid_template)
1225 << DefaultArg.getSourceRange();
1226 return Param;
1227 }
1228
1229 // Check for unexpanded parameter packs.
1230 if (DiagnoseUnexpandedParameterPack(DefaultArg.getLocation(),
1231 DefaultArg.getArgument().getAsTemplate(),
1232 UPPC_DefaultArgument))
1233 return Param;
1234
1235 Param->setDefaultArgument(Context, DefaultArg);
1236 }
1237
1238 return Param;
1239}
1240
1241/// ActOnTemplateParameterList - Builds a TemplateParameterList, optionally
1242/// constrained by RequiresClause, that contains the template parameters in
1243/// Params.
1244TemplateParameterList *
1245Sema::ActOnTemplateParameterList(unsigned Depth,
1246 SourceLocation ExportLoc,
1247 SourceLocation TemplateLoc,
1248 SourceLocation LAngleLoc,
1249 ArrayRef<NamedDecl *> Params,
1250 SourceLocation RAngleLoc,
1251 Expr *RequiresClause) {
1252 if (ExportLoc.isValid())
1253 Diag(ExportLoc, diag::warn_template_export_unsupported);
1254
1255 return TemplateParameterList::Create(
1256 Context, TemplateLoc, LAngleLoc,
1257 llvm::makeArrayRef(Params.data(), Params.size()),
1258 RAngleLoc, RequiresClause);
1259}
1260
1261static void SetNestedNameSpecifier(TagDecl *T, const CXXScopeSpec &SS) {
1262 if (SS.isSet())
1263 T->setQualifierInfo(SS.getWithLocInContext(T->getASTContext()));
1264}
1265
1266DeclResult Sema::CheckClassTemplate(
1267 Scope *S, unsigned TagSpec, TagUseKind TUK, SourceLocation KWLoc,
1268 CXXScopeSpec &SS, IdentifierInfo *Name, SourceLocation NameLoc,
1269 const ParsedAttributesView &Attr, TemplateParameterList *TemplateParams,
1270 AccessSpecifier AS, SourceLocation ModulePrivateLoc,
1271 SourceLocation FriendLoc, unsigned NumOuterTemplateParamLists,
1272 TemplateParameterList **OuterTemplateParamLists, SkipBodyInfo *SkipBody) {
1273 assert(TemplateParams && TemplateParams->size() > 0 &&(static_cast <bool> (TemplateParams && TemplateParams
->size() > 0 && "No template parameters") ? void
(0) : __assert_fail ("TemplateParams && TemplateParams->size() > 0 && \"No template parameters\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1274, __extension__ __PRETTY_FUNCTION__))
1274 "No template parameters")(static_cast <bool> (TemplateParams && TemplateParams
->size() > 0 && "No template parameters") ? void
(0) : __assert_fail ("TemplateParams && TemplateParams->size() > 0 && \"No template parameters\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1274, __extension__ __PRETTY_FUNCTION__))
;
1275 assert(TUK != TUK_Reference && "Can only declare or define class templates")(static_cast <bool> (TUK != TUK_Reference && "Can only declare or define class templates"
) ? void (0) : __assert_fail ("TUK != TUK_Reference && \"Can only declare or define class templates\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1275, __extension__ __PRETTY_FUNCTION__))
;
1276 bool Invalid = false;
1277
1278 // Check that we can declare a template here.
1279 if (CheckTemplateDeclScope(S, TemplateParams))
1
Calling 'Sema::CheckTemplateDeclScope'
1280 return true;
1281
1282 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
1283 assert(Kind != TTK_Enum && "can't build template of enumerated type")(static_cast <bool> (Kind != TTK_Enum && "can't build template of enumerated type"
) ? void (0) : __assert_fail ("Kind != TTK_Enum && \"can't build template of enumerated type\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1283, __extension__ __PRETTY_FUNCTION__))
;
1284
1285 // There is no such thing as an unnamed class template.
1286 if (!Name) {
1287 Diag(KWLoc, diag::err_template_unnamed_class);
1288 return true;
1289 }
1290
1291 // Find any previous declaration with this name. For a friend with no
1292 // scope explicitly specified, we only look for tag declarations (per
1293 // C++11 [basic.lookup.elab]p2).
1294 DeclContext *SemanticContext;
1295 LookupResult Previous(*this, Name, NameLoc,
1296 (SS.isEmpty() && TUK == TUK_Friend)
1297 ? LookupTagName : LookupOrdinaryName,
1298 forRedeclarationInCurContext());
1299 if (SS.isNotEmpty() && !SS.isInvalid()) {
1300 SemanticContext = computeDeclContext(SS, true);
1301 if (!SemanticContext) {
1302 // FIXME: Horrible, horrible hack! We can't currently represent this
1303 // in the AST, and historically we have just ignored such friend
1304 // class templates, so don't complain here.
1305 Diag(NameLoc, TUK == TUK_Friend
1306 ? diag::warn_template_qualified_friend_ignored
1307 : diag::err_template_qualified_declarator_no_match)
1308 << SS.getScopeRep() << SS.getRange();
1309 return TUK != TUK_Friend;
1310 }
1311
1312 if (RequireCompleteDeclContext(SS, SemanticContext))
1313 return true;
1314
1315 // If we're adding a template to a dependent context, we may need to
1316 // rebuilding some of the types used within the template parameter list,
1317 // now that we know what the current instantiation is.
1318 if (SemanticContext->isDependentContext()) {
1319 ContextRAII SavedContext(*this, SemanticContext);
1320 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams))
1321 Invalid = true;
1322 } else if (TUK != TUK_Friend && TUK != TUK_Reference)
1323 diagnoseQualifiedDeclaration(SS, SemanticContext, Name, NameLoc, false);
1324
1325 LookupQualifiedName(Previous, SemanticContext);
1326 } else {
1327 SemanticContext = CurContext;
1328
1329 // C++14 [class.mem]p14:
1330 // If T is the name of a class, then each of the following shall have a
1331 // name different from T:
1332 // -- every member template of class T
1333 if (TUK != TUK_Friend &&
1334 DiagnoseClassNameShadow(SemanticContext,
1335 DeclarationNameInfo(Name, NameLoc)))
1336 return true;
1337
1338 LookupName(Previous, S);
1339 }
1340
1341 if (Previous.isAmbiguous())
1342 return true;
1343
1344 NamedDecl *PrevDecl = nullptr;
1345 if (Previous.begin() != Previous.end())
1346 PrevDecl = (*Previous.begin())->getUnderlyingDecl();
1347
1348 if (PrevDecl && PrevDecl->isTemplateParameter()) {
1349 // Maybe we will complain about the shadowed template parameter.
1350 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl);
1351 // Just pretend that we didn't see the previous declaration.
1352 PrevDecl = nullptr;
1353 }
1354
1355 // If there is a previous declaration with the same name, check
1356 // whether this is a valid redeclaration.
1357 ClassTemplateDecl *PrevClassTemplate =
1358 dyn_cast_or_null<ClassTemplateDecl>(PrevDecl);
1359
1360 // We may have found the injected-class-name of a class template,
1361 // class template partial specialization, or class template specialization.
1362 // In these cases, grab the template that is being defined or specialized.
1363 if (!PrevClassTemplate && PrevDecl && isa<CXXRecordDecl>(PrevDecl) &&
1364 cast<CXXRecordDecl>(PrevDecl)->isInjectedClassName()) {
1365 PrevDecl = cast<CXXRecordDecl>(PrevDecl->getDeclContext());
1366 PrevClassTemplate
1367 = cast<CXXRecordDecl>(PrevDecl)->getDescribedClassTemplate();
1368 if (!PrevClassTemplate && isa<ClassTemplateSpecializationDecl>(PrevDecl)) {
1369 PrevClassTemplate
1370 = cast<ClassTemplateSpecializationDecl>(PrevDecl)
1371 ->getSpecializedTemplate();
1372 }
1373 }
1374
1375 if (TUK == TUK_Friend) {
1376 // C++ [namespace.memdef]p3:
1377 // [...] When looking for a prior declaration of a class or a function
1378 // declared as a friend, and when the name of the friend class or
1379 // function is neither a qualified name nor a template-id, scopes outside
1380 // the innermost enclosing namespace scope are not considered.
1381 if (!SS.isSet()) {
1382 DeclContext *OutermostContext = CurContext;
1383 while (!OutermostContext->isFileContext())
1384 OutermostContext = OutermostContext->getLookupParent();
1385
1386 if (PrevDecl &&
1387 (OutermostContext->Equals(PrevDecl->getDeclContext()) ||
1388 OutermostContext->Encloses(PrevDecl->getDeclContext()))) {
1389 SemanticContext = PrevDecl->getDeclContext();
1390 } else {
1391 // Declarations in outer scopes don't matter. However, the outermost
1392 // context we computed is the semantic context for our new
1393 // declaration.
1394 PrevDecl = PrevClassTemplate = nullptr;
1395 SemanticContext = OutermostContext;
1396
1397 // Check that the chosen semantic context doesn't already contain a
1398 // declaration of this name as a non-tag type.
1399 Previous.clear(LookupOrdinaryName);
1400 DeclContext *LookupContext = SemanticContext;
1401 while (LookupContext->isTransparentContext())
1402 LookupContext = LookupContext->getLookupParent();
1403 LookupQualifiedName(Previous, LookupContext);
1404
1405 if (Previous.isAmbiguous())
1406 return true;
1407
1408 if (Previous.begin() != Previous.end())
1409 PrevDecl = (*Previous.begin())->getUnderlyingDecl();
1410 }
1411 }
1412 } else if (PrevDecl &&
1413 !isDeclInScope(Previous.getRepresentativeDecl(), SemanticContext,
1414 S, SS.isValid()))
1415 PrevDecl = PrevClassTemplate = nullptr;
1416
1417 if (auto *Shadow = dyn_cast_or_null<UsingShadowDecl>(
1418 PrevDecl ? Previous.getRepresentativeDecl() : nullptr)) {
1419 if (SS.isEmpty() &&
1420 !(PrevClassTemplate &&
1421 PrevClassTemplate->getDeclContext()->getRedeclContext()->Equals(
1422 SemanticContext->getRedeclContext()))) {
1423 Diag(KWLoc, diag::err_using_decl_conflict_reverse);
1424 Diag(Shadow->getTargetDecl()->getLocation(),
1425 diag::note_using_decl_target);
1426 Diag(Shadow->getUsingDecl()->getLocation(), diag::note_using_decl) << 0;
1427 // Recover by ignoring the old declaration.
1428 PrevDecl = PrevClassTemplate = nullptr;
1429 }
1430 }
1431
1432 // TODO Memory management; associated constraints are not always stored.
1433 Expr *const CurAC = formAssociatedConstraints(TemplateParams, nullptr);
1434
1435 if (PrevClassTemplate) {
1436 // Ensure that the template parameter lists are compatible. Skip this check
1437 // for a friend in a dependent context: the template parameter list itself
1438 // could be dependent.
1439 if (!(TUK == TUK_Friend && CurContext->isDependentContext()) &&
1440 !TemplateParameterListsAreEqual(TemplateParams,
1441 PrevClassTemplate->getTemplateParameters(),
1442 /*Complain=*/true,
1443 TPL_TemplateMatch))
1444 return true;
1445
1446 // Check for matching associated constraints on redeclarations.
1447 const Expr *const PrevAC = PrevClassTemplate->getAssociatedConstraints();
1448 const bool RedeclACMismatch = [&] {
1449 if (!(CurAC || PrevAC))
1450 return false; // Nothing to check; no mismatch.
1451 if (CurAC && PrevAC) {
1452 llvm::FoldingSetNodeID CurACInfo, PrevACInfo;
1453 CurAC->Profile(CurACInfo, Context, /*Canonical=*/true);
1454 PrevAC->Profile(PrevACInfo, Context, /*Canonical=*/true);
1455 if (CurACInfo == PrevACInfo)
1456 return false; // All good; no mismatch.
1457 }
1458 return true;
1459 }();
1460
1461 if (RedeclACMismatch) {
1462 Diag(CurAC ? CurAC->getLocStart() : NameLoc,
1463 diag::err_template_different_associated_constraints);
1464 Diag(PrevAC ? PrevAC->getLocStart() : PrevClassTemplate->getLocation(),
1465 diag::note_template_prev_declaration) << /*declaration*/0;
1466 return true;
1467 }
1468
1469 // C++ [temp.class]p4:
1470 // In a redeclaration, partial specialization, explicit
1471 // specialization or explicit instantiation of a class template,
1472 // the class-key shall agree in kind with the original class
1473 // template declaration (7.1.5.3).
1474 RecordDecl *PrevRecordDecl = PrevClassTemplate->getTemplatedDecl();
1475 if (!isAcceptableTagRedeclaration(PrevRecordDecl, Kind,
1476 TUK == TUK_Definition, KWLoc, Name)) {
1477 Diag(KWLoc, diag::err_use_with_wrong_tag)
1478 << Name
1479 << FixItHint::CreateReplacement(KWLoc, PrevRecordDecl->getKindName());
1480 Diag(PrevRecordDecl->getLocation(), diag::note_previous_use);
1481 Kind = PrevRecordDecl->getTagKind();
1482 }
1483
1484 // Check for redefinition of this class template.
1485 if (TUK == TUK_Definition) {
1486 if (TagDecl *Def = PrevRecordDecl->getDefinition()) {
1487 // If we have a prior definition that is not visible, treat this as
1488 // simply making that previous definition visible.
1489 NamedDecl *Hidden = nullptr;
1490 if (SkipBody && !hasVisibleDefinition(Def, &Hidden)) {
1491 SkipBody->ShouldSkip = true;
1492 auto *Tmpl = cast<CXXRecordDecl>(Hidden)->getDescribedClassTemplate();
1493 assert(Tmpl && "original definition of a class template is not a "(static_cast <bool> (Tmpl && "original definition of a class template is not a "
"class template?") ? void (0) : __assert_fail ("Tmpl && \"original definition of a class template is not a \" \"class template?\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1494, __extension__ __PRETTY_FUNCTION__))
1494 "class template?")(static_cast <bool> (Tmpl && "original definition of a class template is not a "
"class template?") ? void (0) : __assert_fail ("Tmpl && \"original definition of a class template is not a \" \"class template?\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1494, __extension__ __PRETTY_FUNCTION__))
;
1495 makeMergedDefinitionVisible(Hidden);
1496 makeMergedDefinitionVisible(Tmpl);
1497 return Def;
1498 }
1499
1500 Diag(NameLoc, diag::err_redefinition) << Name;
1501 Diag(Def->getLocation(), diag::note_previous_definition);
1502 // FIXME: Would it make sense to try to "forget" the previous
1503 // definition, as part of error recovery?
1504 return true;
1505 }
1506 }
1507 } else if (PrevDecl) {
1508 // C++ [temp]p5:
1509 // A class template shall not have the same name as any other
1510 // template, class, function, object, enumeration, enumerator,
1511 // namespace, or type in the same scope (3.3), except as specified
1512 // in (14.5.4).
1513 Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
1514 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
1515 return true;
1516 }
1517
1518 // Check the template parameter list of this declaration, possibly
1519 // merging in the template parameter list from the previous class
1520 // template declaration. Skip this check for a friend in a dependent
1521 // context, because the template parameter list might be dependent.
1522 if (!(TUK == TUK_Friend && CurContext->isDependentContext()) &&
1523 CheckTemplateParameterList(
1524 TemplateParams,
1525 PrevClassTemplate ? PrevClassTemplate->getTemplateParameters()
1526 : nullptr,
1527 (SS.isSet() && SemanticContext && SemanticContext->isRecord() &&
1528 SemanticContext->isDependentContext())
1529 ? TPC_ClassTemplateMember
1530 : TUK == TUK_Friend ? TPC_FriendClassTemplate
1531 : TPC_ClassTemplate))
1532 Invalid = true;
1533
1534 if (SS.isSet()) {
1535 // If the name of the template was qualified, we must be defining the
1536 // template out-of-line.
1537 if (!SS.isInvalid() && !Invalid && !PrevClassTemplate) {
1538 Diag(NameLoc, TUK == TUK_Friend ? diag::err_friend_decl_does_not_match
1539 : diag::err_member_decl_does_not_match)
1540 << Name << SemanticContext << /*IsDefinition*/true << SS.getRange();
1541 Invalid = true;
1542 }
1543 }
1544
1545 // If this is a templated friend in a dependent context we should not put it
1546 // on the redecl chain. In some cases, the templated friend can be the most
1547 // recent declaration tricking the template instantiator to make substitutions
1548 // there.
1549 // FIXME: Figure out how to combine with shouldLinkDependentDeclWithPrevious
1550 bool ShouldAddRedecl
1551 = !(TUK == TUK_Friend && CurContext->isDependentContext());
1552
1553 CXXRecordDecl *NewClass =
1554 CXXRecordDecl::Create(Context, Kind, SemanticContext, KWLoc, NameLoc, Name,
1555 PrevClassTemplate && ShouldAddRedecl ?
1556 PrevClassTemplate->getTemplatedDecl() : nullptr,
1557 /*DelayTypeCreation=*/true);
1558 SetNestedNameSpecifier(NewClass, SS);
1559 if (NumOuterTemplateParamLists > 0)
1560 NewClass->setTemplateParameterListsInfo(
1561 Context, llvm::makeArrayRef(OuterTemplateParamLists,
1562 NumOuterTemplateParamLists));
1563
1564 // Add alignment attributes if necessary; these attributes are checked when
1565 // the ASTContext lays out the structure.
1566 if (TUK == TUK_Definition) {
1567 AddAlignmentAttributesForRecord(NewClass);
1568 AddMsStructLayoutForRecord(NewClass);
1569 }
1570
1571 // Attach the associated constraints when the declaration will not be part of
1572 // a decl chain.
1573 Expr *const ACtoAttach =
1574 PrevClassTemplate && ShouldAddRedecl ? nullptr : CurAC;
1575
1576 ClassTemplateDecl *NewTemplate
1577 = ClassTemplateDecl::Create(Context, SemanticContext, NameLoc,
1578 DeclarationName(Name), TemplateParams,
1579 NewClass, ACtoAttach);
1580
1581 if (ShouldAddRedecl)
1582 NewTemplate->setPreviousDecl(PrevClassTemplate);
1583
1584 NewClass->setDescribedClassTemplate(NewTemplate);
1585
1586 if (ModulePrivateLoc.isValid())
1587 NewTemplate->setModulePrivate();
1588
1589 // Build the type for the class template declaration now.
1590 QualType T = NewTemplate->getInjectedClassNameSpecialization();
1591 T = Context.getInjectedClassNameType(NewClass, T);
1592 assert(T->isDependentType() && "Class template type is not dependent?")(static_cast <bool> (T->isDependentType() &&
"Class template type is not dependent?") ? void (0) : __assert_fail
("T->isDependentType() && \"Class template type is not dependent?\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1592, __extension__ __PRETTY_FUNCTION__))
;
1593 (void)T;
1594
1595 // If we are providing an explicit specialization of a member that is a
1596 // class template, make a note of that.
1597 if (PrevClassTemplate &&
1598 PrevClassTemplate->getInstantiatedFromMemberTemplate())
1599 PrevClassTemplate->setMemberSpecialization();
1600
1601 // Set the access specifier.
1602 if (!Invalid && TUK != TUK_Friend && NewTemplate->getDeclContext()->isRecord())
1603 SetMemberAccessSpecifier(NewTemplate, PrevClassTemplate, AS);
1604
1605 // Set the lexical context of these templates
1606 NewClass->setLexicalDeclContext(CurContext);
1607 NewTemplate->setLexicalDeclContext(CurContext);
1608
1609 if (TUK == TUK_Definition)
1610 NewClass->startDefinition();
1611
1612 ProcessDeclAttributeList(S, NewClass, Attr);
1613
1614 if (PrevClassTemplate)
1615 mergeDeclAttributes(NewClass, PrevClassTemplate->getTemplatedDecl());
1616
1617 AddPushedVisibilityAttribute(NewClass);
1618
1619 if (TUK != TUK_Friend) {
1620 // Per C++ [basic.scope.temp]p2, skip the template parameter scopes.
1621 Scope *Outer = S;
1622 while ((Outer->getFlags() & Scope::TemplateParamScope) != 0)
1623 Outer = Outer->getParent();
1624 PushOnScopeChains(NewTemplate, Outer);
1625 } else {
1626 if (PrevClassTemplate && PrevClassTemplate->getAccess() != AS_none) {
1627 NewTemplate->setAccess(PrevClassTemplate->getAccess());
1628 NewClass->setAccess(PrevClassTemplate->getAccess());
1629 }
1630
1631 NewTemplate->setObjectOfFriendDecl();
1632
1633 // Friend templates are visible in fairly strange ways.
1634 if (!CurContext->isDependentContext()) {
1635 DeclContext *DC = SemanticContext->getRedeclContext();
1636 DC->makeDeclVisibleInContext(NewTemplate);
1637 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
1638 PushOnScopeChains(NewTemplate, EnclosingScope,
1639 /* AddToContext = */ false);
1640 }
1641
1642 FriendDecl *Friend = FriendDecl::Create(
1643 Context, CurContext, NewClass->getLocation(), NewTemplate, FriendLoc);
1644 Friend->setAccess(AS_public);
1645 CurContext->addDecl(Friend);
1646 }
1647
1648 if (PrevClassTemplate)
1649 CheckRedeclarationModuleOwnership(NewTemplate, PrevClassTemplate);
1650
1651 if (Invalid) {
1652 NewTemplate->setInvalidDecl();
1653 NewClass->setInvalidDecl();
1654 }
1655
1656 ActOnDocumentableDecl(NewTemplate);
1657
1658 return NewTemplate;
1659}
1660
1661namespace {
1662/// Tree transform to "extract" a transformed type from a class template's
1663/// constructor to a deduction guide.
1664class ExtractTypeForDeductionGuide
1665 : public TreeTransform<ExtractTypeForDeductionGuide> {
1666public:
1667 typedef TreeTransform<ExtractTypeForDeductionGuide> Base;
1668 ExtractTypeForDeductionGuide(Sema &SemaRef) : Base(SemaRef) {}
1669
1670 TypeSourceInfo *transform(TypeSourceInfo *TSI) { return TransformType(TSI); }
1671
1672 QualType TransformTypedefType(TypeLocBuilder &TLB, TypedefTypeLoc TL) {
1673 return TransformType(
1674 TLB,
1675 TL.getTypedefNameDecl()->getTypeSourceInfo()->getTypeLoc());
1676 }
1677};
1678
1679/// Transform to convert portions of a constructor declaration into the
1680/// corresponding deduction guide, per C++1z [over.match.class.deduct]p1.
1681struct ConvertConstructorToDeductionGuideTransform {
1682 ConvertConstructorToDeductionGuideTransform(Sema &S,
1683 ClassTemplateDecl *Template)
1684 : SemaRef(S), Template(Template) {}
1685
1686 Sema &SemaRef;
1687 ClassTemplateDecl *Template;
1688
1689 DeclContext *DC = Template->getDeclContext();
1690 CXXRecordDecl *Primary = Template->getTemplatedDecl();
1691 DeclarationName DeductionGuideName =
1692 SemaRef.Context.DeclarationNames.getCXXDeductionGuideName(Template);
1693
1694 QualType DeducedType = SemaRef.Context.getTypeDeclType(Primary);
1695
1696 // Index adjustment to apply to convert depth-1 template parameters into
1697 // depth-0 template parameters.
1698 unsigned Depth1IndexAdjustment = Template->getTemplateParameters()->size();
1699
1700 /// Transform a constructor declaration into a deduction guide.
1701 NamedDecl *transformConstructor(FunctionTemplateDecl *FTD,
1702 CXXConstructorDecl *CD) {
1703 SmallVector<TemplateArgument, 16> SubstArgs;
1704
1705 LocalInstantiationScope Scope(SemaRef);
1706
1707 // C++ [over.match.class.deduct]p1:
1708 // -- For each constructor of the class template designated by the
1709 // template-name, a function template with the following properties:
1710
1711 // -- The template parameters are the template parameters of the class
1712 // template followed by the template parameters (including default
1713 // template arguments) of the constructor, if any.
1714 TemplateParameterList *TemplateParams = Template->getTemplateParameters();
1715 if (FTD) {
1716 TemplateParameterList *InnerParams = FTD->getTemplateParameters();
1717 SmallVector<NamedDecl *, 16> AllParams;
1718 AllParams.reserve(TemplateParams->size() + InnerParams->size());
1719 AllParams.insert(AllParams.begin(),
1720 TemplateParams->begin(), TemplateParams->end());
1721 SubstArgs.reserve(InnerParams->size());
1722
1723 // Later template parameters could refer to earlier ones, so build up
1724 // a list of substituted template arguments as we go.
1725 for (NamedDecl *Param : *InnerParams) {
1726 MultiLevelTemplateArgumentList Args;
1727 Args.addOuterTemplateArguments(SubstArgs);
1728 Args.addOuterRetainedLevel();
1729 NamedDecl *NewParam = transformTemplateParameter(Param, Args);
1730 if (!NewParam)
1731 return nullptr;
1732 AllParams.push_back(NewParam);
1733 SubstArgs.push_back(SemaRef.Context.getCanonicalTemplateArgument(
1734 SemaRef.Context.getInjectedTemplateArg(NewParam)));
1735 }
1736 TemplateParams = TemplateParameterList::Create(
1737 SemaRef.Context, InnerParams->getTemplateLoc(),
1738 InnerParams->getLAngleLoc(), AllParams, InnerParams->getRAngleLoc(),
1739 /*FIXME: RequiresClause*/ nullptr);
1740 }
1741
1742 // If we built a new template-parameter-list, track that we need to
1743 // substitute references to the old parameters into references to the
1744 // new ones.
1745 MultiLevelTemplateArgumentList Args;
1746 if (FTD) {
1747 Args.addOuterTemplateArguments(SubstArgs);
1748 Args.addOuterRetainedLevel();
1749 }
1750
1751 FunctionProtoTypeLoc FPTL = CD->getTypeSourceInfo()->getTypeLoc()
1752 .getAsAdjusted<FunctionProtoTypeLoc>();
1753 assert(FPTL && "no prototype for constructor declaration")(static_cast <bool> (FPTL && "no prototype for constructor declaration"
) ? void (0) : __assert_fail ("FPTL && \"no prototype for constructor declaration\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1753, __extension__ __PRETTY_FUNCTION__))
;
1754
1755 // Transform the type of the function, adjusting the return type and
1756 // replacing references to the old parameters with references to the
1757 // new ones.
1758 TypeLocBuilder TLB;
1759 SmallVector<ParmVarDecl*, 8> Params;
1760 QualType NewType = transformFunctionProtoType(TLB, FPTL, Params, Args);
1761 if (NewType.isNull())
1762 return nullptr;
1763 TypeSourceInfo *NewTInfo = TLB.getTypeSourceInfo(SemaRef.Context, NewType);
1764
1765 return buildDeductionGuide(TemplateParams, CD->isExplicit(), NewTInfo,
1766 CD->getLocStart(), CD->getLocation(),
1767 CD->getLocEnd());
1768 }
1769
1770 /// Build a deduction guide with the specified parameter types.
1771 NamedDecl *buildSimpleDeductionGuide(MutableArrayRef<QualType> ParamTypes) {
1772 SourceLocation Loc = Template->getLocation();
1773
1774 // Build the requested type.
1775 FunctionProtoType::ExtProtoInfo EPI;
1776 EPI.HasTrailingReturn = true;
1777 QualType Result = SemaRef.BuildFunctionType(DeducedType, ParamTypes, Loc,
1778 DeductionGuideName, EPI);
1779 TypeSourceInfo *TSI = SemaRef.Context.getTrivialTypeSourceInfo(Result, Loc);
1780
1781 FunctionProtoTypeLoc FPTL =
1782 TSI->getTypeLoc().castAs<FunctionProtoTypeLoc>();
1783
1784 // Build the parameters, needed during deduction / substitution.
1785 SmallVector<ParmVarDecl*, 4> Params;
1786 for (auto T : ParamTypes) {
1787 ParmVarDecl *NewParam = ParmVarDecl::Create(
1788 SemaRef.Context, DC, Loc, Loc, nullptr, T,
1789 SemaRef.Context.getTrivialTypeSourceInfo(T, Loc), SC_None, nullptr);
1790 NewParam->setScopeInfo(0, Params.size());
1791 FPTL.setParam(Params.size(), NewParam);
1792 Params.push_back(NewParam);
1793 }
1794
1795 return buildDeductionGuide(Template->getTemplateParameters(), false, TSI,
1796 Loc, Loc, Loc);
1797 }
1798
1799private:
1800 /// Transform a constructor template parameter into a deduction guide template
1801 /// parameter, rebuilding any internal references to earlier parameters and
1802 /// renumbering as we go.
1803 NamedDecl *transformTemplateParameter(NamedDecl *TemplateParam,
1804 MultiLevelTemplateArgumentList &Args) {
1805 if (auto *TTP = dyn_cast<TemplateTypeParmDecl>(TemplateParam)) {
1806 // TemplateTypeParmDecl's index cannot be changed after creation, so
1807 // substitute it directly.
1808 auto *NewTTP = TemplateTypeParmDecl::Create(
1809 SemaRef.Context, DC, TTP->getLocStart(), TTP->getLocation(),
1810 /*Depth*/0, Depth1IndexAdjustment + TTP->getIndex(),
1811 TTP->getIdentifier(), TTP->wasDeclaredWithTypename(),
1812 TTP->isParameterPack());
1813 if (TTP->hasDefaultArgument()) {
1814 TypeSourceInfo *InstantiatedDefaultArg =
1815 SemaRef.SubstType(TTP->getDefaultArgumentInfo(), Args,
1816 TTP->getDefaultArgumentLoc(), TTP->getDeclName());
1817 if (InstantiatedDefaultArg)
1818 NewTTP->setDefaultArgument(InstantiatedDefaultArg);
1819 }
1820 SemaRef.CurrentInstantiationScope->InstantiatedLocal(TemplateParam,
1821 NewTTP);
1822 return NewTTP;
1823 }
1824
1825 if (auto *TTP = dyn_cast<TemplateTemplateParmDecl>(TemplateParam))
1826 return transformTemplateParameterImpl(TTP, Args);
1827
1828 return transformTemplateParameterImpl(
1829 cast<NonTypeTemplateParmDecl>(TemplateParam), Args);
1830 }
1831 template<typename TemplateParmDecl>
1832 TemplateParmDecl *
1833 transformTemplateParameterImpl(TemplateParmDecl *OldParam,
1834 MultiLevelTemplateArgumentList &Args) {
1835 // Ask the template instantiator to do the heavy lifting for us, then adjust
1836 // the index of the parameter once it's done.
1837 auto *NewParam =
1838 cast_or_null<TemplateParmDecl>(SemaRef.SubstDecl(OldParam, DC, Args));
1839 assert(NewParam->getDepth() == 0 && "unexpected template param depth")(static_cast <bool> (NewParam->getDepth() == 0 &&
"unexpected template param depth") ? void (0) : __assert_fail
("NewParam->getDepth() == 0 && \"unexpected template param depth\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1839, __extension__ __PRETTY_FUNCTION__))
;
1840 NewParam->setPosition(NewParam->getPosition() + Depth1IndexAdjustment);
1841 return NewParam;
1842 }
1843
1844 QualType transformFunctionProtoType(TypeLocBuilder &TLB,
1845 FunctionProtoTypeLoc TL,
1846 SmallVectorImpl<ParmVarDecl*> &Params,
1847 MultiLevelTemplateArgumentList &Args) {
1848 SmallVector<QualType, 4> ParamTypes;
1849 const FunctionProtoType *T = TL.getTypePtr();
1850
1851 // -- The types of the function parameters are those of the constructor.
1852 for (auto *OldParam : TL.getParams()) {
1853 ParmVarDecl *NewParam = transformFunctionTypeParam(OldParam, Args);
1854 if (!NewParam)
1855 return QualType();
1856 ParamTypes.push_back(NewParam->getType());
1857 Params.push_back(NewParam);
1858 }
1859
1860 // -- The return type is the class template specialization designated by
1861 // the template-name and template arguments corresponding to the
1862 // template parameters obtained from the class template.
1863 //
1864 // We use the injected-class-name type of the primary template instead.
1865 // This has the convenient property that it is different from any type that
1866 // the user can write in a deduction-guide (because they cannot enter the
1867 // context of the template), so implicit deduction guides can never collide
1868 // with explicit ones.
1869 QualType ReturnType = DeducedType;
1870 TLB.pushTypeSpec(ReturnType).setNameLoc(Primary->getLocation());
1871
1872 // Resolving a wording defect, we also inherit the variadicness of the
1873 // constructor.
1874 FunctionProtoType::ExtProtoInfo EPI;
1875 EPI.Variadic = T->isVariadic();
1876 EPI.HasTrailingReturn = true;
1877
1878 QualType Result = SemaRef.BuildFunctionType(
1879 ReturnType, ParamTypes, TL.getLocStart(), DeductionGuideName, EPI);
1880 if (Result.isNull())
1881 return QualType();
1882
1883 FunctionProtoTypeLoc NewTL = TLB.push<FunctionProtoTypeLoc>(Result);
1884 NewTL.setLocalRangeBegin(TL.getLocalRangeBegin());
1885 NewTL.setLParenLoc(TL.getLParenLoc());
1886 NewTL.setRParenLoc(TL.getRParenLoc());
1887 NewTL.setExceptionSpecRange(SourceRange());
1888 NewTL.setLocalRangeEnd(TL.getLocalRangeEnd());
1889 for (unsigned I = 0, E = NewTL.getNumParams(); I != E; ++I)
1890 NewTL.setParam(I, Params[I]);
1891
1892 return Result;
1893 }
1894
1895 ParmVarDecl *
1896 transformFunctionTypeParam(ParmVarDecl *OldParam,
1897 MultiLevelTemplateArgumentList &Args) {
1898 TypeSourceInfo *OldDI = OldParam->getTypeSourceInfo();
1899 TypeSourceInfo *NewDI;
1900 if (auto PackTL = OldDI->getTypeLoc().getAs<PackExpansionTypeLoc>()) {
1901 // Expand out the one and only element in each inner pack.
1902 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, 0);
1903 NewDI =
1904 SemaRef.SubstType(PackTL.getPatternLoc(), Args,
1905 OldParam->getLocation(), OldParam->getDeclName());
1906 if (!NewDI) return nullptr;
1907 NewDI =
1908 SemaRef.CheckPackExpansion(NewDI, PackTL.getEllipsisLoc(),
1909 PackTL.getTypePtr()->getNumExpansions());
1910 } else
1911 NewDI = SemaRef.SubstType(OldDI, Args, OldParam->getLocation(),
1912 OldParam->getDeclName());
1913 if (!NewDI)
1914 return nullptr;
1915
1916 // Extract the type. This (for instance) replaces references to typedef
1917 // members of the current instantiations with the definitions of those
1918 // typedefs, avoiding triggering instantiation of the deduced type during
1919 // deduction.
1920 NewDI = ExtractTypeForDeductionGuide(SemaRef).transform(NewDI);
1921
1922 // Resolving a wording defect, we also inherit default arguments from the
1923 // constructor.
1924 ExprResult NewDefArg;
1925 if (OldParam->hasDefaultArg()) {
1926 NewDefArg = SemaRef.SubstExpr(OldParam->getDefaultArg(), Args);
1927 if (NewDefArg.isInvalid())
1928 return nullptr;
1929 }
1930
1931 ParmVarDecl *NewParam = ParmVarDecl::Create(SemaRef.Context, DC,
1932 OldParam->getInnerLocStart(),
1933 OldParam->getLocation(),
1934 OldParam->getIdentifier(),
1935 NewDI->getType(),
1936 NewDI,
1937 OldParam->getStorageClass(),
1938 NewDefArg.get());
1939 NewParam->setScopeInfo(OldParam->getFunctionScopeDepth(),
1940 OldParam->getFunctionScopeIndex());
1941 SemaRef.CurrentInstantiationScope->InstantiatedLocal(OldParam, NewParam);
1942 return NewParam;
1943 }
1944
1945 NamedDecl *buildDeductionGuide(TemplateParameterList *TemplateParams,
1946 bool Explicit, TypeSourceInfo *TInfo,
1947 SourceLocation LocStart, SourceLocation Loc,
1948 SourceLocation LocEnd) {
1949 DeclarationNameInfo Name(DeductionGuideName, Loc);
1950 ArrayRef<ParmVarDecl *> Params =
1951 TInfo->getTypeLoc().castAs<FunctionProtoTypeLoc>().getParams();
1952
1953 // Build the implicit deduction guide template.
1954 auto *Guide =
1955 CXXDeductionGuideDecl::Create(SemaRef.Context, DC, LocStart, Explicit,
1956 Name, TInfo->getType(), TInfo, LocEnd);
1957 Guide->setImplicit();
1958 Guide->setParams(Params);
1959
1960 for (auto *Param : Params)
1961 Param->setDeclContext(Guide);
1962
1963 auto *GuideTemplate = FunctionTemplateDecl::Create(
1964 SemaRef.Context, DC, Loc, DeductionGuideName, TemplateParams, Guide);
1965 GuideTemplate->setImplicit();
1966 Guide->setDescribedFunctionTemplate(GuideTemplate);
1967
1968 if (isa<CXXRecordDecl>(DC)) {
1969 Guide->setAccess(AS_public);
1970 GuideTemplate->setAccess(AS_public);
1971 }
1972
1973 DC->addDecl(GuideTemplate);
1974 return GuideTemplate;
1975 }
1976};
1977}
1978
1979void Sema::DeclareImplicitDeductionGuides(TemplateDecl *Template,
1980 SourceLocation Loc) {
1981 DeclContext *DC = Template->getDeclContext();
1982 if (DC->isDependentContext())
1983 return;
1984
1985 ConvertConstructorToDeductionGuideTransform Transform(
1986 *this, cast<ClassTemplateDecl>(Template));
1987 if (!isCompleteType(Loc, Transform.DeducedType))
1988 return;
1989
1990 // Check whether we've already declared deduction guides for this template.
1991 // FIXME: Consider storing a flag on the template to indicate this.
1992 auto Existing = DC->lookup(Transform.DeductionGuideName);
1993 for (auto *D : Existing)
1994 if (D->isImplicit())
1995 return;
1996
1997 // In case we were expanding a pack when we attempted to declare deduction
1998 // guides, turn off pack expansion for everything we're about to do.
1999 ArgumentPackSubstitutionIndexRAII SubstIndex(*this, -1);
2000 // Create a template instantiation record to track the "instantiation" of
2001 // constructors into deduction guides.
2002 // FIXME: Add a kind for this to give more meaningful diagnostics. But can
2003 // this substitution process actually fail?
2004 InstantiatingTemplate BuildingDeductionGuides(*this, Loc, Template);
2005 if (BuildingDeductionGuides.isInvalid())
2006 return;
2007
2008 // Convert declared constructors into deduction guide templates.
2009 // FIXME: Skip constructors for which deduction must necessarily fail (those
2010 // for which some class template parameter without a default argument never
2011 // appears in a deduced context).
2012 bool AddedAny = false;
2013 for (NamedDecl *D : LookupConstructors(Transform.Primary)) {
2014 D = D->getUnderlyingDecl();
2015 if (D->isInvalidDecl() || D->isImplicit())
2016 continue;
2017 D = cast<NamedDecl>(D->getCanonicalDecl());
2018
2019 auto *FTD = dyn_cast<FunctionTemplateDecl>(D);
2020 auto *CD =
2021 dyn_cast_or_null<CXXConstructorDecl>(FTD ? FTD->getTemplatedDecl() : D);
2022 // Class-scope explicit specializations (MS extension) do not result in
2023 // deduction guides.
2024 if (!CD || (!FTD && CD->isFunctionTemplateSpecialization()))
2025 continue;
2026
2027 Transform.transformConstructor(FTD, CD);
2028 AddedAny = true;
2029 }
2030
2031 // C++17 [over.match.class.deduct]
2032 // -- If C is not defined or does not declare any constructors, an
2033 // additional function template derived as above from a hypothetical
2034 // constructor C().
2035 if (!AddedAny)
2036 Transform.buildSimpleDeductionGuide(None);
2037
2038 // -- An additional function template derived as above from a hypothetical
2039 // constructor C(C), called the copy deduction candidate.
2040 cast<CXXDeductionGuideDecl>(
2041 cast<FunctionTemplateDecl>(
2042 Transform.buildSimpleDeductionGuide(Transform.DeducedType))
2043 ->getTemplatedDecl())
2044 ->setIsCopyDeductionCandidate();
2045}
2046
2047/// Diagnose the presence of a default template argument on a
2048/// template parameter, which is ill-formed in certain contexts.
2049///
2050/// \returns true if the default template argument should be dropped.
2051static bool DiagnoseDefaultTemplateArgument(Sema &S,
2052 Sema::TemplateParamListContext TPC,
2053 SourceLocation ParamLoc,
2054 SourceRange DefArgRange) {
2055 switch (TPC) {
2056 case Sema::TPC_ClassTemplate:
2057 case Sema::TPC_VarTemplate:
2058 case Sema::TPC_TypeAliasTemplate:
2059 return false;
2060
2061 case Sema::TPC_FunctionTemplate:
2062 case Sema::TPC_FriendFunctionTemplateDefinition:
2063 // C++ [temp.param]p9:
2064 // A default template-argument shall not be specified in a
2065 // function template declaration or a function template
2066 // definition [...]
2067 // If a friend function template declaration specifies a default
2068 // template-argument, that declaration shall be a definition and shall be
2069 // the only declaration of the function template in the translation unit.
2070 // (C++98/03 doesn't have this wording; see DR226).
2071 S.Diag(ParamLoc, S.getLangOpts().CPlusPlus11 ?
2072 diag::warn_cxx98_compat_template_parameter_default_in_function_template
2073 : diag::ext_template_parameter_default_in_function_template)
2074 << DefArgRange;
2075 return false;
2076
2077 case Sema::TPC_ClassTemplateMember:
2078 // C++0x [temp.param]p9:
2079 // A default template-argument shall not be specified in the
2080 // template-parameter-lists of the definition of a member of a
2081 // class template that appears outside of the member's class.
2082 S.Diag(ParamLoc, diag::err_template_parameter_default_template_member)
2083 << DefArgRange;
2084 return true;
2085
2086 case Sema::TPC_FriendClassTemplate:
2087 case Sema::TPC_FriendFunctionTemplate:
2088 // C++ [temp.param]p9:
2089 // A default template-argument shall not be specified in a
2090 // friend template declaration.
2091 S.Diag(ParamLoc, diag::err_template_parameter_default_friend_template)
2092 << DefArgRange;
2093 return true;
2094
2095 // FIXME: C++0x [temp.param]p9 allows default template-arguments
2096 // for friend function templates if there is only a single
2097 // declaration (and it is a definition). Strange!
2098 }
2099
2100 llvm_unreachable("Invalid TemplateParamListContext!")::llvm::llvm_unreachable_internal("Invalid TemplateParamListContext!"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2100)
;
2101}
2102
2103/// Check for unexpanded parameter packs within the template parameters
2104/// of a template template parameter, recursively.
2105static bool DiagnoseUnexpandedParameterPacks(Sema &S,
2106 TemplateTemplateParmDecl *TTP) {
2107 // A template template parameter which is a parameter pack is also a pack
2108 // expansion.
2109 if (TTP->isParameterPack())
2110 return false;
2111
2112 TemplateParameterList *Params = TTP->getTemplateParameters();
2113 for (unsigned I = 0, N = Params->size(); I != N; ++I) {
2114 NamedDecl *P = Params->getParam(I);
2115 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
2116 if (!NTTP->isParameterPack() &&
2117 S.DiagnoseUnexpandedParameterPack(NTTP->getLocation(),
2118 NTTP->getTypeSourceInfo(),
2119 Sema::UPPC_NonTypeTemplateParameterType))
2120 return true;
2121
2122 continue;
2123 }
2124
2125 if (TemplateTemplateParmDecl *InnerTTP
2126 = dyn_cast<TemplateTemplateParmDecl>(P))
2127 if (DiagnoseUnexpandedParameterPacks(S, InnerTTP))
2128 return true;
2129 }
2130
2131 return false;
2132}
2133
2134/// Checks the validity of a template parameter list, possibly
2135/// considering the template parameter list from a previous
2136/// declaration.
2137///
2138/// If an "old" template parameter list is provided, it must be
2139/// equivalent (per TemplateParameterListsAreEqual) to the "new"
2140/// template parameter list.
2141///
2142/// \param NewParams Template parameter list for a new template
2143/// declaration. This template parameter list will be updated with any
2144/// default arguments that are carried through from the previous
2145/// template parameter list.
2146///
2147/// \param OldParams If provided, template parameter list from a
2148/// previous declaration of the same template. Default template
2149/// arguments will be merged from the old template parameter list to
2150/// the new template parameter list.
2151///
2152/// \param TPC Describes the context in which we are checking the given
2153/// template parameter list.
2154///
2155/// \returns true if an error occurred, false otherwise.
2156bool Sema::CheckTemplateParameterList(TemplateParameterList *NewParams,
2157 TemplateParameterList *OldParams,
2158 TemplateParamListContext TPC) {
2159 bool Invalid = false;
2160
2161 // C++ [temp.param]p10:
2162 // The set of default template-arguments available for use with a
2163 // template declaration or definition is obtained by merging the
2164 // default arguments from the definition (if in scope) and all
2165 // declarations in scope in the same way default function
2166 // arguments are (8.3.6).
2167 bool SawDefaultArgument = false;
2168 SourceLocation PreviousDefaultArgLoc;
2169
2170 // Dummy initialization to avoid warnings.
2171 TemplateParameterList::iterator OldParam = NewParams->end();
2172 if (OldParams)
2173 OldParam = OldParams->begin();
2174
2175 bool RemoveDefaultArguments = false;
2176 for (TemplateParameterList::iterator NewParam = NewParams->begin(),
2177 NewParamEnd = NewParams->end();
2178 NewParam != NewParamEnd; ++NewParam) {
2179 // Variables used to diagnose redundant default arguments
2180 bool RedundantDefaultArg = false;
2181 SourceLocation OldDefaultLoc;
2182 SourceLocation NewDefaultLoc;
2183
2184 // Variable used to diagnose missing default arguments
2185 bool MissingDefaultArg = false;
2186
2187 // Variable used to diagnose non-final parameter packs
2188 bool SawParameterPack = false;
2189
2190 if (TemplateTypeParmDecl *NewTypeParm
2191 = dyn_cast<TemplateTypeParmDecl>(*NewParam)) {
2192 // Check the presence of a default argument here.
2193 if (NewTypeParm->hasDefaultArgument() &&
2194 DiagnoseDefaultTemplateArgument(*this, TPC,
2195 NewTypeParm->getLocation(),
2196 NewTypeParm->getDefaultArgumentInfo()->getTypeLoc()
2197 .getSourceRange()))
2198 NewTypeParm->removeDefaultArgument();
2199
2200 // Merge default arguments for template type parameters.
2201 TemplateTypeParmDecl *OldTypeParm
2202 = OldParams? cast<TemplateTypeParmDecl>(*OldParam) : nullptr;
2203 if (NewTypeParm->isParameterPack()) {
2204 assert(!NewTypeParm->hasDefaultArgument() &&(static_cast <bool> (!NewTypeParm->hasDefaultArgument
() && "Parameter packs can't have a default argument!"
) ? void (0) : __assert_fail ("!NewTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2205, __extension__ __PRETTY_FUNCTION__))
2205 "Parameter packs can't have a default argument!")(static_cast <bool> (!NewTypeParm->hasDefaultArgument
() && "Parameter packs can't have a default argument!"
) ? void (0) : __assert_fail ("!NewTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2205, __extension__ __PRETTY_FUNCTION__))
;
2206 SawParameterPack = true;
2207 } else if (OldTypeParm && hasVisibleDefaultArgument(OldTypeParm) &&
2208 NewTypeParm->hasDefaultArgument()) {
2209 OldDefaultLoc = OldTypeParm->getDefaultArgumentLoc();
2210 NewDefaultLoc = NewTypeParm->getDefaultArgumentLoc();
2211 SawDefaultArgument = true;
2212 RedundantDefaultArg = true;
2213 PreviousDefaultArgLoc = NewDefaultLoc;
2214 } else if (OldTypeParm && OldTypeParm->hasDefaultArgument()) {
2215 // Merge the default argument from the old declaration to the
2216 // new declaration.
2217 NewTypeParm->setInheritedDefaultArgument(Context, OldTypeParm);
2218 PreviousDefaultArgLoc = OldTypeParm->getDefaultArgumentLoc();
2219 } else if (NewTypeParm->hasDefaultArgument()) {
2220 SawDefaultArgument = true;
2221 PreviousDefaultArgLoc = NewTypeParm->getDefaultArgumentLoc();
2222 } else if (SawDefaultArgument)
2223 MissingDefaultArg = true;
2224 } else if (NonTypeTemplateParmDecl *NewNonTypeParm
2225 = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) {
2226 // Check for unexpanded parameter packs.
2227 if (!NewNonTypeParm->isParameterPack() &&
2228 DiagnoseUnexpandedParameterPack(NewNonTypeParm->getLocation(),
2229 NewNonTypeParm->getTypeSourceInfo(),
2230 UPPC_NonTypeTemplateParameterType)) {
2231 Invalid = true;
2232 continue;
2233 }
2234
2235 // Check the presence of a default argument here.
2236 if (NewNonTypeParm->hasDefaultArgument() &&
2237 DiagnoseDefaultTemplateArgument(*this, TPC,
2238 NewNonTypeParm->getLocation(),
2239 NewNonTypeParm->getDefaultArgument()->getSourceRange())) {
2240 NewNonTypeParm->removeDefaultArgument();
2241 }
2242
2243 // Merge default arguments for non-type template parameters
2244 NonTypeTemplateParmDecl *OldNonTypeParm
2245 = OldParams? cast<NonTypeTemplateParmDecl>(*OldParam) : nullptr;
2246 if (NewNonTypeParm->isParameterPack()) {
2247 assert(!NewNonTypeParm->hasDefaultArgument() &&(static_cast <bool> (!NewNonTypeParm->hasDefaultArgument
() && "Parameter packs can't have a default argument!"
) ? void (0) : __assert_fail ("!NewNonTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2248, __extension__ __PRETTY_FUNCTION__))
2248 "Parameter packs can't have a default argument!")(static_cast <bool> (!NewNonTypeParm->hasDefaultArgument
() && "Parameter packs can't have a default argument!"
) ? void (0) : __assert_fail ("!NewNonTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2248, __extension__ __PRETTY_FUNCTION__))
;
2249 if (!NewNonTypeParm->isPackExpansion())
2250 SawParameterPack = true;
2251 } else if (OldNonTypeParm && hasVisibleDefaultArgument(OldNonTypeParm) &&
2252 NewNonTypeParm->hasDefaultArgument()) {
2253 OldDefaultLoc = OldNonTypeParm->getDefaultArgumentLoc();
2254 NewDefaultLoc = NewNonTypeParm->getDefaultArgumentLoc();
2255 SawDefaultArgument = true;
2256 RedundantDefaultArg = true;
2257 PreviousDefaultArgLoc = NewDefaultLoc;
2258 } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument()) {
2259 // Merge the default argument from the old declaration to the
2260 // new declaration.
2261 NewNonTypeParm->setInheritedDefaultArgument(Context, OldNonTypeParm);
2262 PreviousDefaultArgLoc = OldNonTypeParm->getDefaultArgumentLoc();
2263 } else if (NewNonTypeParm->hasDefaultArgument()) {
2264 SawDefaultArgument = true;
2265 PreviousDefaultArgLoc = NewNonTypeParm->getDefaultArgumentLoc();
2266 } else if (SawDefaultArgument)
2267 MissingDefaultArg = true;
2268 } else {
2269 TemplateTemplateParmDecl *NewTemplateParm
2270 = cast<TemplateTemplateParmDecl>(*NewParam);
2271
2272 // Check for unexpanded parameter packs, recursively.
2273 if (::DiagnoseUnexpandedParameterPacks(*this, NewTemplateParm)) {
2274 Invalid = true;
2275 continue;
2276 }
2277
2278 // Check the presence of a default argument here.
2279 if (NewTemplateParm->hasDefaultArgument() &&
2280 DiagnoseDefaultTemplateArgument(*this, TPC,
2281 NewTemplateParm->getLocation(),
2282 NewTemplateParm->getDefaultArgument().getSourceRange()))
2283 NewTemplateParm->removeDefaultArgument();
2284
2285 // Merge default arguments for template template parameters
2286 TemplateTemplateParmDecl *OldTemplateParm
2287 = OldParams? cast<TemplateTemplateParmDecl>(*OldParam) : nullptr;
2288 if (NewTemplateParm->isParameterPack()) {
2289 assert(!NewTemplateParm->hasDefaultArgument() &&(static_cast <bool> (!NewTemplateParm->hasDefaultArgument
() && "Parameter packs can't have a default argument!"
) ? void (0) : __assert_fail ("!NewTemplateParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2290, __extension__ __PRETTY_FUNCTION__))
2290 "Parameter packs can't have a default argument!")(static_cast <bool> (!NewTemplateParm->hasDefaultArgument
() && "Parameter packs can't have a default argument!"
) ? void (0) : __assert_fail ("!NewTemplateParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2290, __extension__ __PRETTY_FUNCTION__))
;
2291 if (!NewTemplateParm->isPackExpansion())
2292 SawParameterPack = true;
2293 } else if (OldTemplateParm &&
2294 hasVisibleDefaultArgument(OldTemplateParm) &&
2295 NewTemplateParm->hasDefaultArgument()) {
2296 OldDefaultLoc = OldTemplateParm->getDefaultArgument().getLocation();
2297 NewDefaultLoc = NewTemplateParm->getDefaultArgument().getLocation();
2298 SawDefaultArgument = true;
2299 RedundantDefaultArg = true;
2300 PreviousDefaultArgLoc = NewDefaultLoc;
2301 } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument()) {
2302 // Merge the default argument from the old declaration to the
2303 // new declaration.
2304 NewTemplateParm->setInheritedDefaultArgument(Context, OldTemplateParm);
2305 PreviousDefaultArgLoc
2306 = OldTemplateParm->getDefaultArgument().getLocation();
2307 } else if (NewTemplateParm->hasDefaultArgument()) {
2308 SawDefaultArgument = true;
2309 PreviousDefaultArgLoc
2310 = NewTemplateParm->getDefaultArgument().getLocation();
2311 } else if (SawDefaultArgument)
2312 MissingDefaultArg = true;
2313 }
2314
2315 // C++11 [temp.param]p11:
2316 // If a template parameter of a primary class template or alias template
2317 // is a template parameter pack, it shall be the last template parameter.
2318 if (SawParameterPack && (NewParam + 1) != NewParamEnd &&
2319 (TPC == TPC_ClassTemplate || TPC == TPC_VarTemplate ||
2320 TPC == TPC_TypeAliasTemplate)) {
2321 Diag((*NewParam)->getLocation(),
2322 diag::err_template_param_pack_must_be_last_template_parameter);
2323 Invalid = true;
2324 }
2325
2326 if (RedundantDefaultArg) {
2327 // C++ [temp.param]p12:
2328 // A template-parameter shall not be given default arguments
2329 // by two different declarations in the same scope.
2330 Diag(NewDefaultLoc, diag::err_template_param_default_arg_redefinition);
2331 Diag(OldDefaultLoc, diag::note_template_param_prev_default_arg);
2332 Invalid = true;
2333 } else if (MissingDefaultArg && TPC != TPC_FunctionTemplate) {
2334 // C++ [temp.param]p11:
2335 // If a template-parameter of a class template has a default
2336 // template-argument, each subsequent template-parameter shall either
2337 // have a default template-argument supplied or be a template parameter
2338 // pack.
2339 Diag((*NewParam)->getLocation(),
2340 diag::err_template_param_default_arg_missing);
2341 Diag(PreviousDefaultArgLoc, diag::note_template_param_prev_default_arg);
2342 Invalid = true;
2343 RemoveDefaultArguments = true;
2344 }
2345
2346 // If we have an old template parameter list that we're merging
2347 // in, move on to the next parameter.
2348 if (OldParams)
2349 ++OldParam;
2350 }
2351
2352 // We were missing some default arguments at the end of the list, so remove
2353 // all of the default arguments.
2354 if (RemoveDefaultArguments) {
2355 for (TemplateParameterList::iterator NewParam = NewParams->begin(),
2356 NewParamEnd = NewParams->end();
2357 NewParam != NewParamEnd; ++NewParam) {
2358 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*NewParam))
2359 TTP->removeDefaultArgument();
2360 else if (NonTypeTemplateParmDecl *NTTP
2361 = dyn_cast<NonTypeTemplateParmDecl>(*NewParam))
2362 NTTP->removeDefaultArgument();
2363 else
2364 cast<TemplateTemplateParmDecl>(*NewParam)->removeDefaultArgument();
2365 }
2366 }
2367
2368 return Invalid;
2369}
2370
2371namespace {
2372
2373/// A class which looks for a use of a certain level of template
2374/// parameter.
2375struct DependencyChecker : RecursiveASTVisitor<DependencyChecker> {
2376 typedef RecursiveASTVisitor<DependencyChecker> super;
2377
2378 unsigned Depth;
2379
2380 // Whether we're looking for a use of a template parameter that makes the
2381 // overall construct type-dependent / a dependent type. This is strictly
2382 // best-effort for now; we may fail to match at all for a dependent type
2383 // in some cases if this is set.
2384 bool IgnoreNonTypeDependent;
2385
2386 bool Match;
2387 SourceLocation MatchLoc;
2388
2389 DependencyChecker(unsigned Depth, bool IgnoreNonTypeDependent)
2390 : Depth(Depth), IgnoreNonTypeDependent(IgnoreNonTypeDependent),
2391 Match(false) {}
2392
2393 DependencyChecker(TemplateParameterList *Params, bool IgnoreNonTypeDependent)
2394 : IgnoreNonTypeDependent(IgnoreNonTypeDependent), Match(false) {
2395 NamedDecl *ND = Params->getParam(0);
2396 if (TemplateTypeParmDecl *PD = dyn_cast<TemplateTypeParmDecl>(ND)) {
2397 Depth = PD->getDepth();
2398 } else if (NonTypeTemplateParmDecl *PD =
2399 dyn_cast<NonTypeTemplateParmDecl>(ND)) {
2400 Depth = PD->getDepth();
2401 } else {
2402 Depth = cast<TemplateTemplateParmDecl>(ND)->getDepth();
2403 }
2404 }
2405
2406 bool Matches(unsigned ParmDepth, SourceLocation Loc = SourceLocation()) {
2407 if (ParmDepth >= Depth) {
2408 Match = true;
2409 MatchLoc = Loc;
2410 return true;
2411 }
2412 return false;
2413 }
2414
2415 bool TraverseStmt(Stmt *S, DataRecursionQueue *Q = nullptr) {
2416 // Prune out non-type-dependent expressions if requested. This can
2417 // sometimes result in us failing to find a template parameter reference
2418 // (if a value-dependent expression creates a dependent type), but this
2419 // mode is best-effort only.
2420 if (auto *E = dyn_cast_or_null<Expr>(S))
2421 if (IgnoreNonTypeDependent && !E->isTypeDependent())
2422 return true;
2423 return super::TraverseStmt(S, Q);
2424 }
2425
2426 bool TraverseTypeLoc(TypeLoc TL) {
2427 if (IgnoreNonTypeDependent && !TL.isNull() &&
2428 !TL.getType()->isDependentType())
2429 return true;
2430 return super::TraverseTypeLoc(TL);
2431 }
2432
2433 bool VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL) {
2434 return !Matches(TL.getTypePtr()->getDepth(), TL.getNameLoc());
2435 }
2436
2437 bool VisitTemplateTypeParmType(const TemplateTypeParmType *T) {
2438 // For a best-effort search, keep looking until we find a location.
2439 return IgnoreNonTypeDependent || !Matches(T->getDepth());
2440 }
2441
2442 bool TraverseTemplateName(TemplateName N) {
2443 if (TemplateTemplateParmDecl *PD =
2444 dyn_cast_or_null<TemplateTemplateParmDecl>(N.getAsTemplateDecl()))
2445 if (Matches(PD->getDepth()))
2446 return false;
2447 return super::TraverseTemplateName(N);
2448 }
2449
2450 bool VisitDeclRefExpr(DeclRefExpr *E) {
2451 if (NonTypeTemplateParmDecl *PD =
2452 dyn_cast<NonTypeTemplateParmDecl>(E->getDecl()))
2453 if (Matches(PD->getDepth(), E->getExprLoc()))
2454 return false;
2455 return super::VisitDeclRefExpr(E);
2456 }
2457
2458 bool VisitSubstTemplateTypeParmType(const SubstTemplateTypeParmType *T) {
2459 return TraverseType(T->getReplacementType());
2460 }
2461
2462 bool
2463 VisitSubstTemplateTypeParmPackType(const SubstTemplateTypeParmPackType *T) {
2464 return TraverseTemplateArgument(T->getArgumentPack());
2465 }
2466
2467 bool TraverseInjectedClassNameType(const InjectedClassNameType *T) {
2468 return TraverseType(T->getInjectedSpecializationType());
2469 }
2470};
2471} // end anonymous namespace
2472
2473/// Determines whether a given type depends on the given parameter
2474/// list.
2475static bool
2476DependsOnTemplateParameters(QualType T, TemplateParameterList *Params) {
2477 DependencyChecker Checker(Params, /*IgnoreNonTypeDependent*/false);
2478 Checker.TraverseType(T);
2479 return Checker.Match;
2480}
2481
2482// Find the source range corresponding to the named type in the given
2483// nested-name-specifier, if any.
2484static SourceRange getRangeOfTypeInNestedNameSpecifier(ASTContext &Context,
2485 QualType T,
2486 const CXXScopeSpec &SS) {
2487 NestedNameSpecifierLoc NNSLoc(SS.getScopeRep(), SS.location_data());
2488 while (NestedNameSpecifier *NNS = NNSLoc.getNestedNameSpecifier()) {
2489 if (const Type *CurType = NNS->getAsType()) {
2490 if (Context.hasSameUnqualifiedType(T, QualType(CurType, 0)))
2491 return NNSLoc.getTypeLoc().getSourceRange();
2492 } else
2493 break;
2494
2495 NNSLoc = NNSLoc.getPrefix();
2496 }
2497
2498 return SourceRange();
2499}
2500
2501/// Match the given template parameter lists to the given scope
2502/// specifier, returning the template parameter list that applies to the
2503/// name.
2504///
2505/// \param DeclStartLoc the start of the declaration that has a scope
2506/// specifier or a template parameter list.
2507///
2508/// \param DeclLoc The location of the declaration itself.
2509///
2510/// \param SS the scope specifier that will be matched to the given template
2511/// parameter lists. This scope specifier precedes a qualified name that is
2512/// being declared.
2513///
2514/// \param TemplateId The template-id following the scope specifier, if there
2515/// is one. Used to check for a missing 'template<>'.
2516///
2517/// \param ParamLists the template parameter lists, from the outermost to the
2518/// innermost template parameter lists.
2519///
2520/// \param IsFriend Whether to apply the slightly different rules for
2521/// matching template parameters to scope specifiers in friend
2522/// declarations.
2523///
2524/// \param IsMemberSpecialization will be set true if the scope specifier
2525/// denotes a fully-specialized type, and therefore this is a declaration of
2526/// a member specialization.
2527///
2528/// \returns the template parameter list, if any, that corresponds to the
2529/// name that is preceded by the scope specifier @p SS. This template
2530/// parameter list may have template parameters (if we're declaring a
2531/// template) or may have no template parameters (if we're declaring a
2532/// template specialization), or may be NULL (if what we're declaring isn't
2533/// itself a template).
2534TemplateParameterList *Sema::MatchTemplateParametersToScopeSpecifier(
2535 SourceLocation DeclStartLoc, SourceLocation DeclLoc, const CXXScopeSpec &SS,
2536 TemplateIdAnnotation *TemplateId,
2537 ArrayRef<TemplateParameterList *> ParamLists, bool IsFriend,
2538 bool &IsMemberSpecialization, bool &Invalid) {
2539 IsMemberSpecialization = false;
2540 Invalid = false;
2541
2542 // The sequence of nested types to which we will match up the template
2543 // parameter lists. We first build this list by starting with the type named
2544 // by the nested-name-specifier and walking out until we run out of types.
2545 SmallVector<QualType, 4> NestedTypes;
2546 QualType T;
2547 if (SS.getScopeRep()) {
2548 if (CXXRecordDecl *Record
2549 = dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS, true)))
2550 T = Context.getTypeDeclType(Record);
2551 else
2552 T = QualType(SS.getScopeRep()->getAsType(), 0);
2553 }
2554
2555 // If we found an explicit specialization that prevents us from needing
2556 // 'template<>' headers, this will be set to the location of that
2557 // explicit specialization.
2558 SourceLocation ExplicitSpecLoc;
2559
2560 while (!T.isNull()) {
2561 NestedTypes.push_back(T);
2562
2563 // Retrieve the parent of a record type.
2564 if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) {
2565 // If this type is an explicit specialization, we're done.
2566 if (ClassTemplateSpecializationDecl *Spec
2567 = dyn_cast<ClassTemplateSpecializationDecl>(Record)) {
2568 if (!isa<ClassTemplatePartialSpecializationDecl>(Spec) &&
2569 Spec->getSpecializationKind() == TSK_ExplicitSpecialization) {
2570 ExplicitSpecLoc = Spec->getLocation();
2571 break;
2572 }
2573 } else if (Record->getTemplateSpecializationKind()
2574 == TSK_ExplicitSpecialization) {
2575 ExplicitSpecLoc = Record->getLocation();
2576 break;
2577 }
2578
2579 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Record->getParent()))
2580 T = Context.getTypeDeclType(Parent);
2581 else
2582 T = QualType();
2583 continue;
2584 }
2585
2586 if (const TemplateSpecializationType *TST
2587 = T->getAs<TemplateSpecializationType>()) {
2588 if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) {
2589 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Template->getDeclContext()))
2590 T = Context.getTypeDeclType(Parent);
2591 else
2592 T = QualType();
2593 continue;
2594 }
2595 }
2596
2597 // Look one step prior in a dependent template specialization type.
2598 if (const DependentTemplateSpecializationType *DependentTST
2599 = T->getAs<DependentTemplateSpecializationType>()) {
2600 if (NestedNameSpecifier *NNS = DependentTST->getQualifier())
2601 T = QualType(NNS->getAsType(), 0);
2602 else
2603 T = QualType();
2604 continue;
2605 }
2606
2607 // Look one step prior in a dependent name type.
2608 if (const DependentNameType *DependentName = T->getAs<DependentNameType>()){
2609 if (NestedNameSpecifier *NNS = DependentName->getQualifier())
2610 T = QualType(NNS->getAsType(), 0);
2611 else
2612 T = QualType();
2613 continue;
2614 }
2615
2616 // Retrieve the parent of an enumeration type.
2617 if (const EnumType *EnumT = T->getAs<EnumType>()) {
2618 // FIXME: Forward-declared enums require a TSK_ExplicitSpecialization
2619 // check here.
2620 EnumDecl *Enum = EnumT->getDecl();
2621
2622 // Get to the parent type.
2623 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Enum->getParent()))
2624 T = Context.getTypeDeclType(Parent);
2625 else
2626 T = QualType();
2627 continue;
2628 }
2629
2630 T = QualType();
2631 }
2632 // Reverse the nested types list, since we want to traverse from the outermost
2633 // to the innermost while checking template-parameter-lists.
2634 std::reverse(NestedTypes.begin(), NestedTypes.end());
2635
2636 // C++0x [temp.expl.spec]p17:
2637 // A member or a member template may be nested within many
2638 // enclosing class templates. In an explicit specialization for
2639 // such a member, the member declaration shall be preceded by a
2640 // template<> for each enclosing class template that is
2641 // explicitly specialized.
2642 bool SawNonEmptyTemplateParameterList = false;
2643
2644 auto CheckExplicitSpecialization = [&](SourceRange Range, bool Recovery) {
2645 if (SawNonEmptyTemplateParameterList) {
2646 Diag(DeclLoc, diag::err_specialize_member_of_template)
2647 << !Recovery << Range;
2648 Invalid = true;
2649 IsMemberSpecialization = false;
2650 return true;
2651 }
2652
2653 return false;
2654 };
2655
2656 auto DiagnoseMissingExplicitSpecialization = [&] (SourceRange Range) {
2657 // Check that we can have an explicit specialization here.
2658 if (CheckExplicitSpecialization(Range, true))
2659 return true;
2660
2661 // We don't have a template header, but we should.
2662 SourceLocation ExpectedTemplateLoc;
2663 if (!ParamLists.empty())
2664 ExpectedTemplateLoc = ParamLists[0]->getTemplateLoc();
2665 else
2666 ExpectedTemplateLoc = DeclStartLoc;
2667
2668 Diag(DeclLoc, diag::err_template_spec_needs_header)
2669 << Range
2670 << FixItHint::CreateInsertion(ExpectedTemplateLoc, "template<> ");
2671 return false;
2672 };
2673
2674 unsigned ParamIdx = 0;
2675 for (unsigned TypeIdx = 0, NumTypes = NestedTypes.size(); TypeIdx != NumTypes;
2676 ++TypeIdx) {
2677 T = NestedTypes[TypeIdx];
2678
2679 // Whether we expect a 'template<>' header.
2680 bool NeedEmptyTemplateHeader = false;
2681
2682 // Whether we expect a template header with parameters.
2683 bool NeedNonemptyTemplateHeader = false;
2684
2685 // For a dependent type, the set of template parameters that we
2686 // expect to see.
2687 TemplateParameterList *ExpectedTemplateParams = nullptr;
2688
2689 // C++0x [temp.expl.spec]p15:
2690 // A member or a member template may be nested within many enclosing
2691 // class templates. In an explicit specialization for such a member, the
2692 // member declaration shall be preceded by a template<> for each
2693 // enclosing class template that is explicitly specialized.
2694 if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) {
2695 if (ClassTemplatePartialSpecializationDecl *Partial
2696 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) {
2697 ExpectedTemplateParams = Partial->getTemplateParameters();
2698 NeedNonemptyTemplateHeader = true;
2699 } else if (Record->isDependentType()) {
2700 if (Record->getDescribedClassTemplate()) {
2701 ExpectedTemplateParams = Record->getDescribedClassTemplate()
2702 ->getTemplateParameters();
2703 NeedNonemptyTemplateHeader = true;
2704 }
2705 } else if (ClassTemplateSpecializationDecl *Spec
2706 = dyn_cast<ClassTemplateSpecializationDecl>(Record)) {
2707 // C++0x [temp.expl.spec]p4:
2708 // Members of an explicitly specialized class template are defined
2709 // in the same manner as members of normal classes, and not using
2710 // the template<> syntax.
2711 if (Spec->getSpecializationKind() != TSK_ExplicitSpecialization)
2712 NeedEmptyTemplateHeader = true;
2713 else
2714 continue;
2715 } else if (Record->getTemplateSpecializationKind()) {
2716 if (Record->getTemplateSpecializationKind()
2717 != TSK_ExplicitSpecialization &&
2718 TypeIdx == NumTypes - 1)
2719 IsMemberSpecialization = true;
2720
2721 continue;
2722 }
2723 } else if (const TemplateSpecializationType *TST
2724 = T->getAs<TemplateSpecializationType>()) {
2725 if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) {
2726 ExpectedTemplateParams = Template->getTemplateParameters();
2727 NeedNonemptyTemplateHeader = true;
2728 }
2729 } else if (T->getAs<DependentTemplateSpecializationType>()) {
2730 // FIXME: We actually could/should check the template arguments here
2731 // against the corresponding template parameter list.
2732 NeedNonemptyTemplateHeader = false;
2733 }
2734
2735 // C++ [temp.expl.spec]p16:
2736 // In an explicit specialization declaration for a member of a class
2737 // template or a member template that ap- pears in namespace scope, the
2738 // member template and some of its enclosing class templates may remain
2739 // unspecialized, except that the declaration shall not explicitly
2740 // specialize a class member template if its en- closing class templates
2741 // are not explicitly specialized as well.
2742 if (ParamIdx < ParamLists.size()) {
2743 if (ParamLists[ParamIdx]->size() == 0) {
2744 if (CheckExplicitSpecialization(ParamLists[ParamIdx]->getSourceRange(),
2745 false))
2746 return nullptr;
2747 } else
2748 SawNonEmptyTemplateParameterList = true;
2749 }
2750
2751 if (NeedEmptyTemplateHeader) {
2752 // If we're on the last of the types, and we need a 'template<>' header
2753 // here, then it's a member specialization.
2754 if (TypeIdx == NumTypes - 1)
2755 IsMemberSpecialization = true;
2756
2757 if (ParamIdx < ParamLists.size()) {
2758 if (ParamLists[ParamIdx]->size() > 0) {
2759 // The header has template parameters when it shouldn't. Complain.
2760 Diag(ParamLists[ParamIdx]->getTemplateLoc(),
2761 diag::err_template_param_list_matches_nontemplate)
2762 << T
2763 << SourceRange(ParamLists[ParamIdx]->getLAngleLoc(),
2764 ParamLists[ParamIdx]->getRAngleLoc())
2765 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS);
2766 Invalid = true;
2767 return nullptr;
2768 }
2769
2770 // Consume this template header.
2771 ++ParamIdx;
2772 continue;
2773 }
2774
2775 if (!IsFriend)
2776 if (DiagnoseMissingExplicitSpecialization(
2777 getRangeOfTypeInNestedNameSpecifier(Context, T, SS)))
2778 return nullptr;
2779
2780 continue;
2781 }
2782
2783 if (NeedNonemptyTemplateHeader) {
2784 // In friend declarations we can have template-ids which don't
2785 // depend on the corresponding template parameter lists. But
2786 // assume that empty parameter lists are supposed to match this
2787 // template-id.
2788 if (IsFriend && T->isDependentType()) {
2789 if (ParamIdx < ParamLists.size() &&
2790 DependsOnTemplateParameters(T, ParamLists[ParamIdx]))
2791 ExpectedTemplateParams = nullptr;
2792 else
2793 continue;
2794 }
2795
2796 if (ParamIdx < ParamLists.size()) {
2797 // Check the template parameter list, if we can.
2798 if (ExpectedTemplateParams &&
2799 !TemplateParameterListsAreEqual(ParamLists[ParamIdx],
2800 ExpectedTemplateParams,
2801 true, TPL_TemplateMatch))
2802 Invalid = true;
2803
2804 if (!Invalid &&
2805 CheckTemplateParameterList(ParamLists[ParamIdx], nullptr,
2806 TPC_ClassTemplateMember))
2807 Invalid = true;
2808
2809 ++ParamIdx;
2810 continue;
2811 }
2812
2813 Diag(DeclLoc, diag::err_template_spec_needs_template_parameters)
2814 << T
2815 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS);
2816 Invalid = true;
2817 continue;
2818 }
2819 }
2820
2821 // If there were at least as many template-ids as there were template
2822 // parameter lists, then there are no template parameter lists remaining for
2823 // the declaration itself.
2824 if (ParamIdx >= ParamLists.size()) {
2825 if (TemplateId && !IsFriend) {
2826 // We don't have a template header for the declaration itself, but we
2827 // should.
2828 DiagnoseMissingExplicitSpecialization(SourceRange(TemplateId->LAngleLoc,
2829 TemplateId->RAngleLoc));
2830
2831 // Fabricate an empty template parameter list for the invented header.
2832 return TemplateParameterList::Create(Context, SourceLocation(),
2833 SourceLocation(), None,
2834 SourceLocation(), nullptr);
2835 }
2836
2837 return nullptr;
2838 }
2839
2840 // If there were too many template parameter lists, complain about that now.
2841 if (ParamIdx < ParamLists.size() - 1) {
2842 bool HasAnyExplicitSpecHeader = false;
2843 bool AllExplicitSpecHeaders = true;
2844 for (unsigned I = ParamIdx, E = ParamLists.size() - 1; I != E; ++I) {
2845 if (ParamLists[I]->size() == 0)
2846 HasAnyExplicitSpecHeader = true;
2847 else
2848 AllExplicitSpecHeaders = false;
2849 }
2850
2851 Diag(ParamLists[ParamIdx]->getTemplateLoc(),
2852 AllExplicitSpecHeaders ? diag::warn_template_spec_extra_headers
2853 : diag::err_template_spec_extra_headers)
2854 << SourceRange(ParamLists[ParamIdx]->getTemplateLoc(),
2855 ParamLists[ParamLists.size() - 2]->getRAngleLoc());
2856
2857 // If there was a specialization somewhere, such that 'template<>' is
2858 // not required, and there were any 'template<>' headers, note where the
2859 // specialization occurred.
2860 if (ExplicitSpecLoc.isValid() && HasAnyExplicitSpecHeader)
2861 Diag(ExplicitSpecLoc,
2862 diag::note_explicit_template_spec_does_not_need_header)
2863 << NestedTypes.back();
2864
2865 // We have a template parameter list with no corresponding scope, which
2866 // means that the resulting template declaration can't be instantiated
2867 // properly (we'll end up with dependent nodes when we shouldn't).
2868 if (!AllExplicitSpecHeaders)
2869 Invalid = true;
2870 }
2871
2872 // C++ [temp.expl.spec]p16:
2873 // In an explicit specialization declaration for a member of a class
2874 // template or a member template that ap- pears in namespace scope, the
2875 // member template and some of its enclosing class templates may remain
2876 // unspecialized, except that the declaration shall not explicitly
2877 // specialize a class member template if its en- closing class templates
2878 // are not explicitly specialized as well.
2879 if (ParamLists.back()->size() == 0 &&
2880 CheckExplicitSpecialization(ParamLists[ParamIdx]->getSourceRange(),
2881 false))
2882 return nullptr;
2883
2884 // Return the last template parameter list, which corresponds to the
2885 // entity being declared.
2886 return ParamLists.back();
2887}
2888
2889void Sema::NoteAllFoundTemplates(TemplateName Name) {
2890 if (TemplateDecl *Template = Name.getAsTemplateDecl()) {
2891 Diag(Template->getLocation(), diag::note_template_declared_here)
2892 << (isa<FunctionTemplateDecl>(Template)
2893 ? 0
2894 : isa<ClassTemplateDecl>(Template)
2895 ? 1
2896 : isa<VarTemplateDecl>(Template)
2897 ? 2
2898 : isa<TypeAliasTemplateDecl>(Template) ? 3 : 4)
2899 << Template->getDeclName();
2900 return;
2901 }
2902
2903 if (OverloadedTemplateStorage *OST = Name.getAsOverloadedTemplate()) {
2904 for (OverloadedTemplateStorage::iterator I = OST->begin(),
2905 IEnd = OST->end();
2906 I != IEnd; ++I)
2907 Diag((*I)->getLocation(), diag::note_template_declared_here)
2908 << 0 << (*I)->getDeclName();
2909
2910 return;
2911 }
2912}
2913
2914static QualType
2915checkBuiltinTemplateIdType(Sema &SemaRef, BuiltinTemplateDecl *BTD,
2916 const SmallVectorImpl<TemplateArgument> &Converted,
2917 SourceLocation TemplateLoc,
2918 TemplateArgumentListInfo &TemplateArgs) {
2919 ASTContext &Context = SemaRef.getASTContext();
2920 switch (BTD->getBuiltinTemplateKind()) {
2921 case BTK__make_integer_seq: {
2922 // Specializations of __make_integer_seq<S, T, N> are treated like
2923 // S<T, 0, ..., N-1>.
2924
2925 // C++14 [inteseq.intseq]p1:
2926 // T shall be an integer type.
2927 if (!Converted[1].getAsType()->isIntegralType(Context)) {
2928 SemaRef.Diag(TemplateArgs[1].getLocation(),
2929 diag::err_integer_sequence_integral_element_type);
2930 return QualType();
2931 }
2932
2933 // C++14 [inteseq.make]p1:
2934 // If N is negative the program is ill-formed.
2935 TemplateArgument NumArgsArg = Converted[2];
2936 llvm::APSInt NumArgs = NumArgsArg.getAsIntegral();
2937 if (NumArgs < 0) {
2938 SemaRef.Diag(TemplateArgs[2].getLocation(),
2939 diag::err_integer_sequence_negative_length);
2940 return QualType();
2941 }
2942
2943 QualType ArgTy = NumArgsArg.getIntegralType();
2944 TemplateArgumentListInfo SyntheticTemplateArgs;
2945 // The type argument gets reused as the first template argument in the
2946 // synthetic template argument list.
2947 SyntheticTemplateArgs.addArgument(TemplateArgs[1]);
2948 // Expand N into 0 ... N-1.
2949 for (llvm::APSInt I(NumArgs.getBitWidth(), NumArgs.isUnsigned());
2950 I < NumArgs; ++I) {
2951 TemplateArgument TA(Context, I, ArgTy);
2952 SyntheticTemplateArgs.addArgument(SemaRef.getTrivialTemplateArgumentLoc(
2953 TA, ArgTy, TemplateArgs[2].getLocation()));
2954 }
2955 // The first template argument will be reused as the template decl that
2956 // our synthetic template arguments will be applied to.
2957 return SemaRef.CheckTemplateIdType(Converted[0].getAsTemplate(),
2958 TemplateLoc, SyntheticTemplateArgs);
2959 }
2960
2961 case BTK__type_pack_element:
2962 // Specializations of
2963 // __type_pack_element<Index, T_1, ..., T_N>
2964 // are treated like T_Index.
2965 assert(Converted.size() == 2 &&(static_cast <bool> (Converted.size() == 2 && "__type_pack_element should be given an index and a parameter pack"
) ? void (0) : __assert_fail ("Converted.size() == 2 && \"__type_pack_element should be given an index and a parameter pack\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2966, __extension__ __PRETTY_FUNCTION__))
2966 "__type_pack_element should be given an index and a parameter pack")(static_cast <bool> (Converted.size() == 2 && "__type_pack_element should be given an index and a parameter pack"
) ? void (0) : __assert_fail ("Converted.size() == 2 && \"__type_pack_element should be given an index and a parameter pack\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2966, __extension__ __PRETTY_FUNCTION__))
;
2967
2968 // If the Index is out of bounds, the program is ill-formed.
2969 TemplateArgument IndexArg = Converted[0], Ts = Converted[1];
2970 llvm::APSInt Index = IndexArg.getAsIntegral();
2971 assert(Index >= 0 && "the index used with __type_pack_element should be of "(static_cast <bool> (Index >= 0 && "the index used with __type_pack_element should be of "
"type std::size_t, and hence be non-negative") ? void (0) : __assert_fail
("Index >= 0 && \"the index used with __type_pack_element should be of \" \"type std::size_t, and hence be non-negative\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2972, __extension__ __PRETTY_FUNCTION__))
2972 "type std::size_t, and hence be non-negative")(static_cast <bool> (Index >= 0 && "the index used with __type_pack_element should be of "
"type std::size_t, and hence be non-negative") ? void (0) : __assert_fail
("Index >= 0 && \"the index used with __type_pack_element should be of \" \"type std::size_t, and hence be non-negative\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2972, __extension__ __PRETTY_FUNCTION__))
;
2973 if (Index >= Ts.pack_size()) {
2974 SemaRef.Diag(TemplateArgs[0].getLocation(),
2975 diag::err_type_pack_element_out_of_bounds);
2976 return QualType();
2977 }
2978
2979 // We simply return the type at index `Index`.
2980 auto Nth = std::next(Ts.pack_begin(), Index.getExtValue());
2981 return Nth->getAsType();
2982 }
2983 llvm_unreachable("unexpected BuiltinTemplateDecl!")::llvm::llvm_unreachable_internal("unexpected BuiltinTemplateDecl!"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2983)
;
2984}
2985
2986/// Determine whether this alias template is "enable_if_t".
2987static bool isEnableIfAliasTemplate(TypeAliasTemplateDecl *AliasTemplate) {
2988 return AliasTemplate->getName().equals("enable_if_t");
2989}
2990
2991/// Collect all of the separable terms in the given condition, which
2992/// might be a conjunction.
2993///
2994/// FIXME: The right answer is to convert the logical expression into
2995/// disjunctive normal form, so we can find the first failed term
2996/// within each possible clause.
2997static void collectConjunctionTerms(Expr *Clause,
2998 SmallVectorImpl<Expr *> &Terms) {
2999 if (auto BinOp = dyn_cast<BinaryOperator>(Clause->IgnoreParenImpCasts())) {
3000 if (BinOp->getOpcode() == BO_LAnd) {
3001 collectConjunctionTerms(BinOp->getLHS(), Terms);
3002 collectConjunctionTerms(BinOp->getRHS(), Terms);
3003 }
3004
3005 return;
3006 }
3007
3008 Terms.push_back(Clause);
3009}
3010
3011// The ranges-v3 library uses an odd pattern of a top-level "||" with
3012// a left-hand side that is value-dependent but never true. Identify
3013// the idiom and ignore that term.
3014static Expr *lookThroughRangesV3Condition(Preprocessor &PP, Expr *Cond) {
3015 // Top-level '||'.
3016 auto *BinOp = dyn_cast<BinaryOperator>(Cond->IgnoreParenImpCasts());
3017 if (!BinOp) return Cond;
3018
3019 if (BinOp->getOpcode() != BO_LOr) return Cond;
3020
3021 // With an inner '==' that has a literal on the right-hand side.
3022 Expr *LHS = BinOp->getLHS();
3023 auto *InnerBinOp = dyn_cast<BinaryOperator>(LHS->IgnoreParenImpCasts());
3024 if (!InnerBinOp) return Cond;
3025
3026 if (InnerBinOp->getOpcode() != BO_EQ ||
3027 !isa<IntegerLiteral>(InnerBinOp->getRHS()))
3028 return Cond;
3029
3030 // If the inner binary operation came from a macro expansion named
3031 // CONCEPT_REQUIRES or CONCEPT_REQUIRES_, return the right-hand side
3032 // of the '||', which is the real, user-provided condition.
3033 SourceLocation Loc = InnerBinOp->getExprLoc();
3034 if (!Loc.isMacroID()) return Cond;
3035
3036 StringRef MacroName = PP.getImmediateMacroName(Loc);
3037 if (MacroName == "CONCEPT_REQUIRES" || MacroName == "CONCEPT_REQUIRES_")
3038 return BinOp->getRHS();
3039
3040 return Cond;
3041}
3042
3043std::pair<Expr *, std::string>
3044Sema::findFailedBooleanCondition(Expr *Cond, bool AllowTopLevelCond) {
3045 Cond = lookThroughRangesV3Condition(PP, Cond);
3046
3047 // Separate out all of the terms in a conjunction.
3048 SmallVector<Expr *, 4> Terms;
3049 collectConjunctionTerms(Cond, Terms);
3050
3051 // Determine which term failed.
3052 Expr *FailedCond = nullptr;
3053 for (Expr *Term : Terms) {
3054 Expr *TermAsWritten = Term->IgnoreParenImpCasts();
3055
3056 // Literals are uninteresting.
3057 if (isa<CXXBoolLiteralExpr>(TermAsWritten) ||
3058 isa<IntegerLiteral>(TermAsWritten))
3059 continue;
3060
3061 // The initialization of the parameter from the argument is
3062 // a constant-evaluated context.
3063 EnterExpressionEvaluationContext ConstantEvaluated(
3064 *this, Sema::ExpressionEvaluationContext::ConstantEvaluated);
3065
3066 bool Succeeded;
3067 if (Term->EvaluateAsBooleanCondition(Succeeded, Context) &&
3068 !Succeeded) {
3069 FailedCond = TermAsWritten;
3070 break;
3071 }
3072 }
3073
3074 if (!FailedCond) {
3075 if (!AllowTopLevelCond)
3076 return { nullptr, "" };
3077
3078 FailedCond = Cond->IgnoreParenImpCasts();
3079 }
3080
3081 std::string Description;
3082 {
3083 llvm::raw_string_ostream Out(Description);
3084 FailedCond->printPretty(Out, nullptr, getPrintingPolicy());
3085 }
3086 return { FailedCond, Description };
3087}
3088
3089QualType Sema::CheckTemplateIdType(TemplateName Name,
3090 SourceLocation TemplateLoc,
3091 TemplateArgumentListInfo &TemplateArgs) {
3092 DependentTemplateName *DTN
3093 = Name.getUnderlying().getAsDependentTemplateName();
3094 if (DTN && DTN->isIdentifier())
3095 // When building a template-id where the template-name is dependent,
3096 // assume the template is a type template. Either our assumption is
3097 // correct, or the code is ill-formed and will be diagnosed when the
3098 // dependent name is substituted.
3099 return Context.getDependentTemplateSpecializationType(ETK_None,
3100 DTN->getQualifier(),
3101 DTN->getIdentifier(),
3102 TemplateArgs);
3103
3104 TemplateDecl *Template = Name.getAsTemplateDecl();
3105 if (!Template || isa<FunctionTemplateDecl>(Template) ||
3106 isa<VarTemplateDecl>(Template)) {
3107 // We might have a substituted template template parameter pack. If so,
3108 // build a template specialization type for it.
3109 if (Name.getAsSubstTemplateTemplateParmPack())
3110 return Context.getTemplateSpecializationType(Name, TemplateArgs);
3111
3112 Diag(TemplateLoc, diag::err_template_id_not_a_type)
3113 << Name;
3114 NoteAllFoundTemplates(Name);
3115 return QualType();
3116 }
3117
3118 // Check that the template argument list is well-formed for this
3119 // template.
3120 SmallVector<TemplateArgument, 4> Converted;
3121 if (CheckTemplateArgumentList(Template, TemplateLoc, TemplateArgs,
3122 false, Converted))
3123 return QualType();
3124
3125 QualType CanonType;
3126
3127 bool InstantiationDependent = false;
3128 if (TypeAliasTemplateDecl *AliasTemplate =
3129 dyn_cast<TypeAliasTemplateDecl>(Template)) {
3130 // Find the canonical type for this type alias template specialization.
3131 TypeAliasDecl *Pattern = AliasTemplate->getTemplatedDecl();
3132 if (Pattern->isInvalidDecl())
3133 return QualType();
3134
3135 TemplateArgumentList StackTemplateArgs(TemplateArgumentList::OnStack,
3136 Converted);
3137
3138 // Only substitute for the innermost template argument list.
3139 MultiLevelTemplateArgumentList TemplateArgLists;
3140 TemplateArgLists.addOuterTemplateArguments(&StackTemplateArgs);
3141 unsigned Depth = AliasTemplate->getTemplateParameters()->getDepth();
3142 for (unsigned I = 0; I < Depth; ++I)
3143 TemplateArgLists.addOuterTemplateArguments(None);
3144
3145 LocalInstantiationScope Scope(*this);
3146 InstantiatingTemplate Inst(*this, TemplateLoc, Template);
3147 if (Inst.isInvalid())
3148 return QualType();
3149
3150 CanonType = SubstType(Pattern->getUnderlyingType(),
3151 TemplateArgLists, AliasTemplate->getLocation(),
3152 AliasTemplate->getDeclName());
3153 if (CanonType.isNull()) {
3154 // If this was enable_if and we failed to find the nested type
3155 // within enable_if in a SFINAE context, dig out the specific
3156 // enable_if condition that failed and present that instead.
3157 if (isEnableIfAliasTemplate(AliasTemplate)) {
3158 if (auto DeductionInfo = isSFINAEContext()) {
3159 if (*DeductionInfo &&
3160 (*DeductionInfo)->hasSFINAEDiagnostic() &&
3161 (*DeductionInfo)->peekSFINAEDiagnostic().second.getDiagID() ==
3162 diag::err_typename_nested_not_found_enable_if &&
3163 TemplateArgs[0].getArgument().getKind()
3164 == TemplateArgument::Expression) {
3165 Expr *FailedCond;
3166 std::string FailedDescription;
3167 std::tie(FailedCond, FailedDescription) =
3168 findFailedBooleanCondition(
3169 TemplateArgs[0].getSourceExpression(),
3170 /*AllowTopLevelCond=*/true);
3171
3172 // Remove the old SFINAE diagnostic.
3173 PartialDiagnosticAt OldDiag =
3174 {SourceLocation(), PartialDiagnostic::NullDiagnostic()};
3175 (*DeductionInfo)->takeSFINAEDiagnostic(OldDiag);
3176
3177 // Add a new SFINAE diagnostic specifying which condition
3178 // failed.
3179 (*DeductionInfo)->addSFINAEDiagnostic(
3180 OldDiag.first,
3181 PDiag(diag::err_typename_nested_not_found_requirement)
3182 << FailedDescription
3183 << FailedCond->getSourceRange());
3184 }
3185 }
3186 }
3187
3188 return QualType();
3189 }
3190 } else if (Name.isDependent() ||
3191 TemplateSpecializationType::anyDependentTemplateArguments(
3192 TemplateArgs, InstantiationDependent)) {
3193 // This class template specialization is a dependent
3194 // type. Therefore, its canonical type is another class template
3195 // specialization type that contains all of the converted
3196 // arguments in canonical form. This ensures that, e.g., A<T> and
3197 // A<T, T> have identical types when A is declared as:
3198 //
3199 // template<typename T, typename U = T> struct A;
3200 CanonType = Context.getCanonicalTemplateSpecializationType(Name, Converted);
3201
3202 // This might work out to be a current instantiation, in which
3203 // case the canonical type needs to be the InjectedClassNameType.
3204 //
3205 // TODO: in theory this could be a simple hashtable lookup; most
3206 // changes to CurContext don't change the set of current
3207 // instantiations.
3208 if (isa<ClassTemplateDecl>(Template)) {
3209 for (DeclContext *Ctx = CurContext; Ctx; Ctx = Ctx->getLookupParent()) {
3210 // If we get out to a namespace, we're done.
3211 if (Ctx->isFileContext()) break;
3212
3213 // If this isn't a record, keep looking.
3214 CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx);
3215 if (!Record) continue;
3216
3217 // Look for one of the two cases with InjectedClassNameTypes
3218 // and check whether it's the same template.
3219 if (!isa<ClassTemplatePartialSpecializationDecl>(Record) &&
3220 !Record->getDescribedClassTemplate())
3221 continue;
3222
3223 // Fetch the injected class name type and check whether its
3224 // injected type is equal to the type we just built.
3225 QualType ICNT = Context.getTypeDeclType(Record);
3226 QualType Injected = cast<InjectedClassNameType>(ICNT)
3227 ->getInjectedSpecializationType();
3228
3229 if (CanonType != Injected->getCanonicalTypeInternal())
3230 continue;
3231
3232 // If so, the canonical type of this TST is the injected
3233 // class name type of the record we just found.
3234 assert(ICNT.isCanonical())(static_cast <bool> (ICNT.isCanonical()) ? void (0) : __assert_fail
("ICNT.isCanonical()", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3234, __extension__ __PRETTY_FUNCTION__))
;
3235 CanonType = ICNT;
3236 break;
3237 }
3238 }
3239 } else if (ClassTemplateDecl *ClassTemplate
3240 = dyn_cast<ClassTemplateDecl>(Template)) {
3241 // Find the class template specialization declaration that
3242 // corresponds to these arguments.
3243 void *InsertPos = nullptr;
3244 ClassTemplateSpecializationDecl *Decl
3245 = ClassTemplate->findSpecialization(Converted, InsertPos);
3246 if (!Decl) {
3247 // This is the first time we have referenced this class template
3248 // specialization. Create the canonical declaration and add it to
3249 // the set of specializations.
3250 Decl = ClassTemplateSpecializationDecl::Create(Context,
3251 ClassTemplate->getTemplatedDecl()->getTagKind(),
3252 ClassTemplate->getDeclContext(),
3253 ClassTemplate->getTemplatedDecl()->getLocStart(),
3254 ClassTemplate->getLocation(),
3255 ClassTemplate,
3256 Converted, nullptr);
3257 ClassTemplate->AddSpecialization(Decl, InsertPos);
3258 if (ClassTemplate->isOutOfLine())
3259 Decl->setLexicalDeclContext(ClassTemplate->getLexicalDeclContext());
3260 }
3261
3262 if (Decl->getSpecializationKind() == TSK_Undeclared) {
3263 MultiLevelTemplateArgumentList TemplateArgLists;
3264 TemplateArgLists.addOuterTemplateArguments(Converted);
3265 InstantiateAttrsForDecl(TemplateArgLists, ClassTemplate->getTemplatedDecl(),
3266 Decl);
3267 }
3268
3269 // Diagnose uses of this specialization.
3270 (void)DiagnoseUseOfDecl(Decl, TemplateLoc);
3271
3272 CanonType = Context.getTypeDeclType(Decl);
3273 assert(isa<RecordType>(CanonType) &&(static_cast <bool> (isa<RecordType>(CanonType) &&
"type of non-dependent specialization is not a RecordType") ?
void (0) : __assert_fail ("isa<RecordType>(CanonType) && \"type of non-dependent specialization is not a RecordType\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3274, __extension__ __PRETTY_FUNCTION__))
3274 "type of non-dependent specialization is not a RecordType")(static_cast <bool> (isa<RecordType>(CanonType) &&
"type of non-dependent specialization is not a RecordType") ?
void (0) : __assert_fail ("isa<RecordType>(CanonType) && \"type of non-dependent specialization is not a RecordType\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3274, __extension__ __PRETTY_FUNCTION__))
;
3275 } else if (auto *BTD = dyn_cast<BuiltinTemplateDecl>(Template)) {
3276 CanonType = checkBuiltinTemplateIdType(*this, BTD, Converted, TemplateLoc,
3277 TemplateArgs);
3278 }
3279
3280 // Build the fully-sugared type for this class template
3281 // specialization, which refers back to the class template
3282 // specialization we created or found.
3283 return Context.getTemplateSpecializationType(Name, TemplateArgs, CanonType);
3284}
3285
3286TypeResult
3287Sema::ActOnTemplateIdType(CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
3288 TemplateTy TemplateD, IdentifierInfo *TemplateII,
3289 SourceLocation TemplateIILoc,
3290 SourceLocation LAngleLoc,
3291 ASTTemplateArgsPtr TemplateArgsIn,
3292 SourceLocation RAngleLoc,
3293 bool IsCtorOrDtorName, bool IsClassName) {
3294 if (SS.isInvalid())
3295 return true;
3296
3297 if (!IsCtorOrDtorName && !IsClassName && SS.isSet()) {
3298 DeclContext *LookupCtx = computeDeclContext(SS, /*EnteringContext*/false);
3299
3300 // C++ [temp.res]p3:
3301 // A qualified-id that refers to a type and in which the
3302 // nested-name-specifier depends on a template-parameter (14.6.2)
3303 // shall be prefixed by the keyword typename to indicate that the
3304 // qualified-id denotes a type, forming an
3305 // elaborated-type-specifier (7.1.5.3).
3306 if (!LookupCtx && isDependentScopeSpecifier(SS)) {
3307 Diag(SS.getBeginLoc(), diag::err_typename_missing_template)
3308 << SS.getScopeRep() << TemplateII->getName();
3309 // Recover as if 'typename' were specified.
3310 // FIXME: This is not quite correct recovery as we don't transform SS
3311 // into the corresponding dependent form (and we don't diagnose missing
3312 // 'template' keywords within SS as a result).
3313 return ActOnTypenameType(nullptr, SourceLocation(), SS, TemplateKWLoc,
3314 TemplateD, TemplateII, TemplateIILoc, LAngleLoc,
3315 TemplateArgsIn, RAngleLoc);
3316 }
3317
3318 // Per C++ [class.qual]p2, if the template-id was an injected-class-name,
3319 // it's not actually allowed to be used as a type in most cases. Because
3320 // we annotate it before we know whether it's valid, we have to check for
3321 // this case here.
3322 auto *LookupRD = dyn_cast_or_null<CXXRecordDecl>(LookupCtx);
3323 if (LookupRD && LookupRD->getIdentifier() == TemplateII) {
3324 Diag(TemplateIILoc,
3325 TemplateKWLoc.isInvalid()
3326 ? diag::err_out_of_line_qualified_id_type_names_constructor
3327 : diag::ext_out_of_line_qualified_id_type_names_constructor)
3328 << TemplateII << 0 /*injected-class-name used as template name*/
3329 << 1 /*if any keyword was present, it was 'template'*/;
3330 }
3331 }
3332
3333 TemplateName Template = TemplateD.get();
3334
3335 // Translate the parser's template argument list in our AST format.
3336 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
3337 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
3338
3339 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
3340 QualType T
3341 = Context.getDependentTemplateSpecializationType(ETK_None,
3342 DTN->getQualifier(),
3343 DTN->getIdentifier(),
3344 TemplateArgs);
3345 // Build type-source information.
3346 TypeLocBuilder TLB;
3347 DependentTemplateSpecializationTypeLoc SpecTL
3348 = TLB.push<DependentTemplateSpecializationTypeLoc>(T);
3349 SpecTL.setElaboratedKeywordLoc(SourceLocation());
3350 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
3351 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
3352 SpecTL.setTemplateNameLoc(TemplateIILoc);
3353 SpecTL.setLAngleLoc(LAngleLoc);
3354 SpecTL.setRAngleLoc(RAngleLoc);
3355 for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I)
3356 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
3357 return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T));
3358 }
3359
3360 QualType Result = CheckTemplateIdType(Template, TemplateIILoc, TemplateArgs);
3361 if (Result.isNull())
3362 return true;
3363
3364 // Build type-source information.
3365 TypeLocBuilder TLB;
3366 TemplateSpecializationTypeLoc SpecTL
3367 = TLB.push<TemplateSpecializationTypeLoc>(Result);
3368 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
3369 SpecTL.setTemplateNameLoc(TemplateIILoc);
3370 SpecTL.setLAngleLoc(LAngleLoc);
3371 SpecTL.setRAngleLoc(RAngleLoc);
3372 for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i)
3373 SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo());
3374
3375 // NOTE: avoid constructing an ElaboratedTypeLoc if this is a
3376 // constructor or destructor name (in such a case, the scope specifier
3377 // will be attached to the enclosing Decl or Expr node).
3378 if (SS.isNotEmpty() && !IsCtorOrDtorName) {
3379 // Create an elaborated-type-specifier containing the nested-name-specifier.
3380 Result = Context.getElaboratedType(ETK_None, SS.getScopeRep(), Result);
3381 ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result);
3382 ElabTL.setElaboratedKeywordLoc(SourceLocation());
3383 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
3384 }
3385
3386 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
3387}
3388
3389TypeResult Sema::ActOnTagTemplateIdType(TagUseKind TUK,
3390 TypeSpecifierType TagSpec,
3391 SourceLocation TagLoc,
3392 CXXScopeSpec &SS,
3393 SourceLocation TemplateKWLoc,
3394 TemplateTy TemplateD,
3395 SourceLocation TemplateLoc,
3396 SourceLocation LAngleLoc,
3397 ASTTemplateArgsPtr TemplateArgsIn,
3398 SourceLocation RAngleLoc) {
3399 TemplateName Template = TemplateD.get();
3400
3401 // Translate the parser's template argument list in our AST format.
3402 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
3403 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
3404
3405 // Determine the tag kind
3406 TagTypeKind TagKind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
3407 ElaboratedTypeKeyword Keyword
3408 = TypeWithKeyword::getKeywordForTagTypeKind(TagKind);
3409
3410 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
3411 QualType T = Context.getDependentTemplateSpecializationType(Keyword,
3412 DTN->getQualifier(),
3413 DTN->getIdentifier(),
3414 TemplateArgs);
3415
3416 // Build type-source information.
3417 TypeLocBuilder TLB;
3418 DependentTemplateSpecializationTypeLoc SpecTL
3419 = TLB.push<DependentTemplateSpecializationTypeLoc>(T);
3420 SpecTL.setElaboratedKeywordLoc(TagLoc);
3421 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
3422 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
3423 SpecTL.setTemplateNameLoc(TemplateLoc);
3424 SpecTL.setLAngleLoc(LAngleLoc);
3425 SpecTL.setRAngleLoc(RAngleLoc);
3426 for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I)
3427 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
3428 return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T));
3429 }
3430
3431 if (TypeAliasTemplateDecl *TAT =
3432 dyn_cast_or_null<TypeAliasTemplateDecl>(Template.getAsTemplateDecl())) {
3433 // C++0x [dcl.type.elab]p2:
3434 // If the identifier resolves to a typedef-name or the simple-template-id
3435 // resolves to an alias template specialization, the
3436 // elaborated-type-specifier is ill-formed.
3437 Diag(TemplateLoc, diag::err_tag_reference_non_tag)
3438 << TAT << NTK_TypeAliasTemplate << TagKind;
3439 Diag(TAT->getLocation(), diag::note_declared_at);
3440 }
3441
3442 QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs);
3443 if (Result.isNull())
3444 return TypeResult(true);
3445
3446 // Check the tag kind
3447 if (const RecordType *RT = Result->getAs<RecordType>()) {
3448 RecordDecl *D = RT->getDecl();
3449
3450 IdentifierInfo *Id = D->getIdentifier();
3451 assert(Id && "templated class must have an identifier")(static_cast <bool> (Id && "templated class must have an identifier"
) ? void (0) : __assert_fail ("Id && \"templated class must have an identifier\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3451, __extension__ __PRETTY_FUNCTION__))
;
3452
3453 if (!isAcceptableTagRedeclaration(D, TagKind, TUK == TUK_Definition,
3454 TagLoc, Id)) {
3455 Diag(TagLoc, diag::err_use_with_wrong_tag)
3456 << Result
3457 << FixItHint::CreateReplacement(SourceRange(TagLoc), D->getKindName());
3458 Diag(D->getLocation(), diag::note_previous_use);
3459 }
3460 }
3461
3462 // Provide source-location information for the template specialization.
3463 TypeLocBuilder TLB;
3464 TemplateSpecializationTypeLoc SpecTL
3465 = TLB.push<TemplateSpecializationTypeLoc>(Result);
3466 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
3467 SpecTL.setTemplateNameLoc(TemplateLoc);
3468 SpecTL.setLAngleLoc(LAngleLoc);
3469 SpecTL.setRAngleLoc(RAngleLoc);
3470 for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i)
3471 SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo());
3472
3473 // Construct an elaborated type containing the nested-name-specifier (if any)
3474 // and tag keyword.
3475 Result = Context.getElaboratedType(Keyword, SS.getScopeRep(), Result);
3476 ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result);
3477 ElabTL.setElaboratedKeywordLoc(TagLoc);
3478 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
3479 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
3480}
3481
3482static bool CheckTemplateSpecializationScope(Sema &S, NamedDecl *Specialized,
3483 NamedDecl *PrevDecl,
3484 SourceLocation Loc,
3485 bool IsPartialSpecialization);
3486
3487static TemplateSpecializationKind getTemplateSpecializationKind(Decl *D);
3488
3489static bool isTemplateArgumentTemplateParameter(
3490 const TemplateArgument &Arg, unsigned Depth, unsigned Index) {
3491 switch (Arg.getKind()) {
3492 case TemplateArgument::Null:
3493 case TemplateArgument::NullPtr:
3494 case TemplateArgument::Integral:
3495 case TemplateArgument::Declaration:
3496 case TemplateArgument::Pack:
3497 case TemplateArgument::TemplateExpansion:
3498 return false;
3499
3500 case TemplateArgument::Type: {
3501 QualType Type = Arg.getAsType();
3502 const TemplateTypeParmType *TPT =
3503 Arg.getAsType()->getAs<TemplateTypeParmType>();
3504 return TPT && !Type.hasQualifiers() &&
3505 TPT->getDepth() == Depth && TPT->getIndex() == Index;
3506 }
3507
3508 case TemplateArgument::Expression: {
3509 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg.getAsExpr());
3510 if (!DRE || !DRE->getDecl())
3511 return false;
3512 const NonTypeTemplateParmDecl *NTTP =
3513 dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl());
3514 return NTTP && NTTP->getDepth() == Depth && NTTP->getIndex() == Index;
3515 }
3516
3517 case TemplateArgument::Template:
3518 const TemplateTemplateParmDecl *TTP =
3519 dyn_cast_or_null<TemplateTemplateParmDecl>(
3520 Arg.getAsTemplateOrTemplatePattern().getAsTemplateDecl());
3521 return TTP && TTP->getDepth() == Depth && TTP->getIndex() == Index;
3522 }
3523 llvm_unreachable("unexpected kind of template argument")::llvm::llvm_unreachable_internal("unexpected kind of template argument"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3523)
;
3524}
3525
3526static bool isSameAsPrimaryTemplate(TemplateParameterList *Params,
3527 ArrayRef<TemplateArgument> Args) {
3528 if (Params->size() != Args.size())
3529 return false;
3530
3531 unsigned Depth = Params->getDepth();
3532
3533 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
3534 TemplateArgument Arg = Args[I];
3535
3536 // If the parameter is a pack expansion, the argument must be a pack
3537 // whose only element is a pack expansion.
3538 if (Params->getParam(I)->isParameterPack()) {
3539 if (Arg.getKind() != TemplateArgument::Pack || Arg.pack_size() != 1 ||
3540 !Arg.pack_begin()->isPackExpansion())
3541 return false;
3542 Arg = Arg.pack_begin()->getPackExpansionPattern();
3543 }
3544
3545 if (!isTemplateArgumentTemplateParameter(Arg, Depth, I))
3546 return false;
3547 }
3548
3549 return true;
3550}
3551
3552/// Convert the parser's template argument list representation into our form.
3553static TemplateArgumentListInfo
3554makeTemplateArgumentListInfo(Sema &S, TemplateIdAnnotation &TemplateId) {
3555 TemplateArgumentListInfo TemplateArgs(TemplateId.LAngleLoc,
3556 TemplateId.RAngleLoc);
3557 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId.getTemplateArgs(),
3558 TemplateId.NumArgs);
3559 S.translateTemplateArguments(TemplateArgsPtr, TemplateArgs);
3560 return TemplateArgs;
3561}
3562
3563template<typename PartialSpecDecl>
3564static void checkMoreSpecializedThanPrimary(Sema &S, PartialSpecDecl *Partial) {
3565 if (Partial->getDeclContext()->isDependentContext())
3566 return;
3567
3568 // FIXME: Get the TDK from deduction in order to provide better diagnostics
3569 // for non-substitution-failure issues?
3570 TemplateDeductionInfo Info(Partial->getLocation());
3571 if (S.isMoreSpecializedThanPrimary(Partial, Info))
3572 return;
3573
3574 auto *Template = Partial->getSpecializedTemplate();
3575 S.Diag(Partial->getLocation(),
3576 diag::ext_partial_spec_not_more_specialized_than_primary)
3577 << isa<VarTemplateDecl>(Template);
3578
3579 if (Info.hasSFINAEDiagnostic()) {
3580 PartialDiagnosticAt Diag = {SourceLocation(),
3581 PartialDiagnostic::NullDiagnostic()};
3582 Info.takeSFINAEDiagnostic(Diag);
3583 SmallString<128> SFINAEArgString;
3584 Diag.second.EmitToString(S.getDiagnostics(), SFINAEArgString);
3585 S.Diag(Diag.first,
3586 diag::note_partial_spec_not_more_specialized_than_primary)
3587 << SFINAEArgString;
3588 }
3589
3590 S.Diag(Template->getLocation(), diag::note_template_decl_here);
3591}
3592
3593static void
3594noteNonDeducibleParameters(Sema &S, TemplateParameterList *TemplateParams,
3595 const llvm::SmallBitVector &DeducibleParams) {
3596 for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I) {
3597 if (!DeducibleParams[I]) {
3598 NamedDecl *Param = TemplateParams->getParam(I);
3599 if (Param->getDeclName())
3600 S.Diag(Param->getLocation(), diag::note_non_deducible_parameter)
3601 << Param->getDeclName();
3602 else
3603 S.Diag(Param->getLocation(), diag::note_non_deducible_parameter)
3604 << "(anonymous)";
3605 }
3606 }
3607}
3608
3609
3610template<typename PartialSpecDecl>
3611static void checkTemplatePartialSpecialization(Sema &S,
3612 PartialSpecDecl *Partial) {
3613 // C++1z [temp.class.spec]p8: (DR1495)
3614 // - The specialization shall be more specialized than the primary
3615 // template (14.5.5.2).
3616 checkMoreSpecializedThanPrimary(S, Partial);
3617
3618 // C++ [temp.class.spec]p8: (DR1315)
3619 // - Each template-parameter shall appear at least once in the
3620 // template-id outside a non-deduced context.
3621 // C++1z [temp.class.spec.match]p3 (P0127R2)
3622 // If the template arguments of a partial specialization cannot be
3623 // deduced because of the structure of its template-parameter-list
3624 // and the template-id, the program is ill-formed.
3625 auto *TemplateParams = Partial->getTemplateParameters();
3626 llvm::SmallBitVector DeducibleParams(TemplateParams->size());
3627 S.MarkUsedTemplateParameters(Partial->getTemplateArgs(), true,
3628 TemplateParams->getDepth(), DeducibleParams);
3629
3630 if (!DeducibleParams.all()) {
3631 unsigned NumNonDeducible = DeducibleParams.size() - DeducibleParams.count();
3632 S.Diag(Partial->getLocation(), diag::ext_partial_specs_not_deducible)
3633 << isa<VarTemplatePartialSpecializationDecl>(Partial)
3634 << (NumNonDeducible > 1)
3635 << SourceRange(Partial->getLocation(),
3636 Partial->getTemplateArgsAsWritten()->RAngleLoc);
3637 noteNonDeducibleParameters(S, TemplateParams, DeducibleParams);
3638 }
3639}
3640
3641void Sema::CheckTemplatePartialSpecialization(
3642 ClassTemplatePartialSpecializationDecl *Partial) {
3643 checkTemplatePartialSpecialization(*this, Partial);
3644}
3645
3646void Sema::CheckTemplatePartialSpecialization(
3647 VarTemplatePartialSpecializationDecl *Partial) {
3648 checkTemplatePartialSpecialization(*this, Partial);
3649}
3650
3651void Sema::CheckDeductionGuideTemplate(FunctionTemplateDecl *TD) {
3652 // C++1z [temp.param]p11:
3653 // A template parameter of a deduction guide template that does not have a
3654 // default-argument shall be deducible from the parameter-type-list of the
3655 // deduction guide template.
3656 auto *TemplateParams = TD->getTemplateParameters();
3657 llvm::SmallBitVector DeducibleParams(TemplateParams->size());
3658 MarkDeducedTemplateParameters(TD, DeducibleParams);
3659 for (unsigned I = 0; I != TemplateParams->size(); ++I) {
3660 // A parameter pack is deducible (to an empty pack).
3661 auto *Param = TemplateParams->getParam(I);
3662 if (Param->isParameterPack() || hasVisibleDefaultArgument(Param))
3663 DeducibleParams[I] = true;
3664 }
3665
3666 if (!DeducibleParams.all()) {
3667 unsigned NumNonDeducible = DeducibleParams.size() - DeducibleParams.count();
3668 Diag(TD->getLocation(), diag::err_deduction_guide_template_not_deducible)
3669 << (NumNonDeducible > 1);
3670 noteNonDeducibleParameters(*this, TemplateParams, DeducibleParams);
3671 }
3672}
3673
3674DeclResult Sema::ActOnVarTemplateSpecialization(
3675 Scope *S, Declarator &D, TypeSourceInfo *DI, SourceLocation TemplateKWLoc,
3676 TemplateParameterList *TemplateParams, StorageClass SC,
3677 bool IsPartialSpecialization) {
3678 // D must be variable template id.
3679 assert(D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId &&(static_cast <bool> (D.getName().getKind() == UnqualifiedIdKind
::IK_TemplateId && "Variable template specialization is declared with a template it."
) ? void (0) : __assert_fail ("D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId && \"Variable template specialization is declared with a template it.\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3680, __extension__ __PRETTY_FUNCTION__))
3680 "Variable template specialization is declared with a template it.")(static_cast <bool> (D.getName().getKind() == UnqualifiedIdKind
::IK_TemplateId && "Variable template specialization is declared with a template it."
) ? void (0) : __assert_fail ("D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId && \"Variable template specialization is declared with a template it.\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3680, __extension__ __PRETTY_FUNCTION__))
;
3681
3682 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
3683 TemplateArgumentListInfo TemplateArgs =
3684 makeTemplateArgumentListInfo(*this, *TemplateId);
3685 SourceLocation TemplateNameLoc = D.getIdentifierLoc();
3686 SourceLocation LAngleLoc = TemplateId->LAngleLoc;
3687 SourceLocation RAngleLoc = TemplateId->RAngleLoc;
3688
3689 TemplateName Name = TemplateId->Template.get();
3690
3691 // The template-id must name a variable template.
3692 VarTemplateDecl *VarTemplate =
3693 dyn_cast_or_null<VarTemplateDecl>(Name.getAsTemplateDecl());
3694 if (!VarTemplate) {
3695 NamedDecl *FnTemplate;
3696 if (auto *OTS = Name.getAsOverloadedTemplate())
3697 FnTemplate = *OTS->begin();
3698 else
3699 FnTemplate = dyn_cast_or_null<FunctionTemplateDecl>(Name.getAsTemplateDecl());
3700 if (FnTemplate)
3701 return Diag(D.getIdentifierLoc(), diag::err_var_spec_no_template_but_method)
3702 << FnTemplate->getDeclName();
3703 return Diag(D.getIdentifierLoc(), diag::err_var_spec_no_template)
3704 << IsPartialSpecialization;
3705 }
3706
3707 // Check for unexpanded parameter packs in any of the template arguments.
3708 for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
3709 if (DiagnoseUnexpandedParameterPack(TemplateArgs[I],
3710 UPPC_PartialSpecialization))
3711 return true;
3712
3713 // Check that the template argument list is well-formed for this
3714 // template.
3715 SmallVector<TemplateArgument, 4> Converted;
3716 if (CheckTemplateArgumentList(VarTemplate, TemplateNameLoc, TemplateArgs,
3717 false, Converted))
3718 return true;
3719
3720 // Find the variable template (partial) specialization declaration that
3721 // corresponds to these arguments.
3722 if (IsPartialSpecialization) {
3723 if (CheckTemplatePartialSpecializationArgs(TemplateNameLoc, VarTemplate,
3724 TemplateArgs.size(), Converted))
3725 return true;
3726
3727 // FIXME: Move these checks to CheckTemplatePartialSpecializationArgs so we
3728 // also do them during instantiation.
3729 bool InstantiationDependent;
3730 if (!Name.isDependent() &&
3731 !TemplateSpecializationType::anyDependentTemplateArguments(
3732 TemplateArgs.arguments(),
3733 InstantiationDependent)) {
3734 Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized)
3735 << VarTemplate->getDeclName();
3736 IsPartialSpecialization = false;
3737 }
3738
3739 if (isSameAsPrimaryTemplate(VarTemplate->getTemplateParameters(),
3740 Converted)) {
3741 // C++ [temp.class.spec]p9b3:
3742 //
3743 // -- The argument list of the specialization shall not be identical
3744 // to the implicit argument list of the primary template.
3745 Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template)
3746 << /*variable template*/ 1
3747 << /*is definition*/(SC != SC_Extern && !CurContext->isRecord())
3748 << FixItHint::CreateRemoval(SourceRange(LAngleLoc, RAngleLoc));
3749 // FIXME: Recover from this by treating the declaration as a redeclaration
3750 // of the primary template.
3751 return true;
3752 }
3753 }
3754
3755 void *InsertPos = nullptr;
3756 VarTemplateSpecializationDecl *PrevDecl = nullptr;
3757
3758 if (IsPartialSpecialization)
3759 // FIXME: Template parameter list matters too
3760 PrevDecl = VarTemplate->findPartialSpecialization(Converted, InsertPos);
3761 else
3762 PrevDecl = VarTemplate->findSpecialization(Converted, InsertPos);
3763
3764 VarTemplateSpecializationDecl *Specialization = nullptr;
3765
3766 // Check whether we can declare a variable template specialization in
3767 // the current scope.
3768 if (CheckTemplateSpecializationScope(*this, VarTemplate, PrevDecl,
3769 TemplateNameLoc,
3770 IsPartialSpecialization))
3771 return true;
3772
3773 if (PrevDecl && PrevDecl->getSpecializationKind() == TSK_Undeclared) {
3774 // Since the only prior variable template specialization with these
3775 // arguments was referenced but not declared, reuse that
3776 // declaration node as our own, updating its source location and
3777 // the list of outer template parameters to reflect our new declaration.
3778 Specialization = PrevDecl;
3779 Specialization->setLocation(TemplateNameLoc);
3780 PrevDecl = nullptr;
3781 } else if (IsPartialSpecialization) {
3782 // Create a new class template partial specialization declaration node.
3783 VarTemplatePartialSpecializationDecl *PrevPartial =
3784 cast_or_null<VarTemplatePartialSpecializationDecl>(PrevDecl);
3785 VarTemplatePartialSpecializationDecl *Partial =
3786 VarTemplatePartialSpecializationDecl::Create(
3787 Context, VarTemplate->getDeclContext(), TemplateKWLoc,
3788 TemplateNameLoc, TemplateParams, VarTemplate, DI->getType(), DI, SC,
3789 Converted, TemplateArgs);
3790
3791 if (!PrevPartial)
3792 VarTemplate->AddPartialSpecialization(Partial, InsertPos);
3793 Specialization = Partial;
3794
3795 // If we are providing an explicit specialization of a member variable
3796 // template specialization, make a note of that.
3797 if (PrevPartial && PrevPartial->getInstantiatedFromMember())
3798 PrevPartial->setMemberSpecialization();
3799
3800 CheckTemplatePartialSpecialization(Partial);
3801 } else {
3802 // Create a new class template specialization declaration node for
3803 // this explicit specialization or friend declaration.
3804 Specialization = VarTemplateSpecializationDecl::Create(
3805 Context, VarTemplate->getDeclContext(), TemplateKWLoc, TemplateNameLoc,
3806 VarTemplate, DI->getType(), DI, SC, Converted);
3807 Specialization->setTemplateArgsInfo(TemplateArgs);
3808
3809 if (!PrevDecl)
3810 VarTemplate->AddSpecialization(Specialization, InsertPos);
3811 }
3812
3813 // C++ [temp.expl.spec]p6:
3814 // If a template, a member template or the member of a class template is
3815 // explicitly specialized then that specialization shall be declared
3816 // before the first use of that specialization that would cause an implicit
3817 // instantiation to take place, in every translation unit in which such a
3818 // use occurs; no diagnostic is required.
3819 if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) {
3820 bool Okay = false;
3821 for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) {
3822 // Is there any previous explicit specialization declaration?
3823 if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) {
3824 Okay = true;
3825 break;
3826 }
3827 }
3828
3829 if (!Okay) {
3830 SourceRange Range(TemplateNameLoc, RAngleLoc);
3831 Diag(TemplateNameLoc, diag::err_specialization_after_instantiation)
3832 << Name << Range;
3833
3834 Diag(PrevDecl->getPointOfInstantiation(),
3835 diag::note_instantiation_required_here)
3836 << (PrevDecl->getTemplateSpecializationKind() !=
3837 TSK_ImplicitInstantiation);
3838 return true;
3839 }
3840 }
3841
3842 Specialization->setTemplateKeywordLoc(TemplateKWLoc);
3843 Specialization->setLexicalDeclContext(CurContext);
3844
3845 // Add the specialization into its lexical context, so that it can
3846 // be seen when iterating through the list of declarations in that
3847 // context. However, specializations are not found by name lookup.
3848 CurContext->addDecl(Specialization);
3849
3850 // Note that this is an explicit specialization.
3851 Specialization->setSpecializationKind(TSK_ExplicitSpecialization);
3852
3853 if (PrevDecl) {
3854 // Check that this isn't a redefinition of this specialization,
3855 // merging with previous declarations.
3856 LookupResult PrevSpec(*this, GetNameForDeclarator(D), LookupOrdinaryName,
3857 forRedeclarationInCurContext());
3858 PrevSpec.addDecl(PrevDecl);
3859 D.setRedeclaration(CheckVariableDeclaration(Specialization, PrevSpec));
3860 } else if (Specialization->isStaticDataMember() &&
3861 Specialization->isOutOfLine()) {
3862 Specialization->setAccess(VarTemplate->getAccess());
3863 }
3864
3865 // Link instantiations of static data members back to the template from
3866 // which they were instantiated.
3867 if (Specialization->isStaticDataMember())
3868 Specialization->setInstantiationOfStaticDataMember(
3869 VarTemplate->getTemplatedDecl(),
3870 Specialization->getSpecializationKind());
3871
3872 return Specialization;
3873}
3874
3875namespace {
3876/// A partial specialization whose template arguments have matched
3877/// a given template-id.
3878struct PartialSpecMatchResult {
3879 VarTemplatePartialSpecializationDecl *Partial;
3880 TemplateArgumentList *Args;
3881};
3882} // end anonymous namespace
3883
3884DeclResult
3885Sema::CheckVarTemplateId(VarTemplateDecl *Template, SourceLocation TemplateLoc,
3886 SourceLocation TemplateNameLoc,
3887 const TemplateArgumentListInfo &TemplateArgs) {
3888 assert(Template && "A variable template id without template?")(static_cast <bool> (Template && "A variable template id without template?"
) ? void (0) : __assert_fail ("Template && \"A variable template id without template?\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3888, __extension__ __PRETTY_FUNCTION__))
;
3889
3890 // Check that the template argument list is well-formed for this template.
3891 SmallVector<TemplateArgument, 4> Converted;
3892 if (CheckTemplateArgumentList(
3893 Template, TemplateNameLoc,
3894 const_cast<TemplateArgumentListInfo &>(TemplateArgs), false,
3895 Converted))
3896 return true;
3897
3898 // Find the variable template specialization declaration that
3899 // corresponds to these arguments.
3900 void *InsertPos = nullptr;
3901 if (VarTemplateSpecializationDecl *Spec = Template->findSpecialization(
3902 Converted, InsertPos)) {
3903 checkSpecializationVisibility(TemplateNameLoc, Spec);
3904 // If we already have a variable template specialization, return it.
3905 return Spec;
3906 }
3907
3908 // This is the first time we have referenced this variable template
3909 // specialization. Create the canonical declaration and add it to
3910 // the set of specializations, based on the closest partial specialization
3911 // that it represents. That is,
3912 VarDecl *InstantiationPattern = Template->getTemplatedDecl();
3913 TemplateArgumentList TemplateArgList(TemplateArgumentList::OnStack,
3914 Converted);
3915 TemplateArgumentList *InstantiationArgs = &TemplateArgList;
3916 bool AmbiguousPartialSpec = false;
3917 typedef PartialSpecMatchResult MatchResult;
3918 SmallVector<MatchResult, 4> Matched;
3919 SourceLocation PointOfInstantiation = TemplateNameLoc;
3920 TemplateSpecCandidateSet FailedCandidates(PointOfInstantiation,
3921 /*ForTakingAddress=*/false);
3922
3923 // 1. Attempt to find the closest partial specialization that this
3924 // specializes, if any.
3925 // If any of the template arguments is dependent, then this is probably
3926 // a placeholder for an incomplete declarative context; which must be
3927 // complete by instantiation time. Thus, do not search through the partial
3928 // specializations yet.
3929 // TODO: Unify with InstantiateClassTemplateSpecialization()?
3930 // Perhaps better after unification of DeduceTemplateArguments() and
3931 // getMoreSpecializedPartialSpecialization().
3932 bool InstantiationDependent = false;
3933 if (!TemplateSpecializationType::anyDependentTemplateArguments(
3934 TemplateArgs, InstantiationDependent)) {
3935
3936 SmallVector<VarTemplatePartialSpecializationDecl *, 4> PartialSpecs;
3937 Template->getPartialSpecializations(PartialSpecs);
3938
3939 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) {
3940 VarTemplatePartialSpecializationDecl *Partial = PartialSpecs[I];
3941 TemplateDeductionInfo Info(FailedCandidates.getLocation());
3942
3943 if (TemplateDeductionResult Result =
3944 DeduceTemplateArguments(Partial, TemplateArgList, Info)) {
3945 // Store the failed-deduction information for use in diagnostics, later.
3946 // TODO: Actually use the failed-deduction info?
3947 FailedCandidates.addCandidate().set(
3948 DeclAccessPair::make(Template, AS_public), Partial,
3949 MakeDeductionFailureInfo(Context, Result, Info));
3950 (void)Result;
3951 } else {
3952 Matched.push_back(PartialSpecMatchResult());
3953 Matched.back().Partial = Partial;
3954 Matched.back().Args = Info.take();
3955 }
3956 }
3957
3958 if (Matched.size() >= 1) {
3959 SmallVector<MatchResult, 4>::iterator Best = Matched.begin();
3960 if (Matched.size() == 1) {
3961 // -- If exactly one matching specialization is found, the
3962 // instantiation is generated from that specialization.
3963 // We don't need to do anything for this.
3964 } else {
3965 // -- If more than one matching specialization is found, the
3966 // partial order rules (14.5.4.2) are used to determine
3967 // whether one of the specializations is more specialized
3968 // than the others. If none of the specializations is more
3969 // specialized than all of the other matching
3970 // specializations, then the use of the variable template is
3971 // ambiguous and the program is ill-formed.
3972 for (SmallVector<MatchResult, 4>::iterator P = Best + 1,
3973 PEnd = Matched.end();
3974 P != PEnd; ++P) {
3975 if (getMoreSpecializedPartialSpecialization(P->Partial, Best->Partial,
3976 PointOfInstantiation) ==
3977 P->Partial)
3978 Best = P;
3979 }
3980
3981 // Determine if the best partial specialization is more specialized than
3982 // the others.
3983 for (SmallVector<MatchResult, 4>::iterator P = Matched.begin(),
3984 PEnd = Matched.end();
3985 P != PEnd; ++P) {
3986 if (P != Best && getMoreSpecializedPartialSpecialization(
3987 P->Partial, Best->Partial,
3988 PointOfInstantiation) != Best->Partial) {
3989 AmbiguousPartialSpec = true;
3990 break;
3991 }
3992 }
3993 }
3994
3995 // Instantiate using the best variable template partial specialization.
3996 InstantiationPattern = Best->Partial;
3997 InstantiationArgs = Best->Args;
3998 } else {
3999 // -- If no match is found, the instantiation is generated
4000 // from the primary template.
4001 // InstantiationPattern = Template->getTemplatedDecl();
4002 }
4003 }
4004
4005 // 2. Create the canonical declaration.
4006 // Note that we do not instantiate a definition until we see an odr-use
4007 // in DoMarkVarDeclReferenced().
4008 // FIXME: LateAttrs et al.?
4009 VarTemplateSpecializationDecl *Decl = BuildVarTemplateInstantiation(
4010 Template, InstantiationPattern, *InstantiationArgs, TemplateArgs,
4011 Converted, TemplateNameLoc, InsertPos /*, LateAttrs, StartingScope*/);
4012 if (!Decl)
4013 return true;
4014
4015 if (AmbiguousPartialSpec) {
4016 // Partial ordering did not produce a clear winner. Complain.
4017 Decl->setInvalidDecl();
4018 Diag(PointOfInstantiation, diag::err_partial_spec_ordering_ambiguous)
4019 << Decl;
4020
4021 // Print the matching partial specializations.
4022 for (MatchResult P : Matched)
4023 Diag(P.Partial->getLocation(), diag::note_partial_spec_match)
4024 << getTemplateArgumentBindingsText(P.Partial->getTemplateParameters(),
4025 *P.Args);
4026 return true;
4027 }
4028
4029 if (VarTemplatePartialSpecializationDecl *D =
4030 dyn_cast<VarTemplatePartialSpecializationDecl>(InstantiationPattern))
4031 Decl->setInstantiationOf(D, InstantiationArgs);
4032
4033 checkSpecializationVisibility(TemplateNameLoc, Decl);
4034
4035 assert(Decl && "No variable template specialization?")(static_cast <bool> (Decl && "No variable template specialization?"
) ? void (0) : __assert_fail ("Decl && \"No variable template specialization?\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4035, __extension__ __PRETTY_FUNCTION__))
;
4036 return Decl;
4037}
4038
4039ExprResult
4040Sema::CheckVarTemplateId(const CXXScopeSpec &SS,
4041 const DeclarationNameInfo &NameInfo,
4042 VarTemplateDecl *Template, SourceLocation TemplateLoc,
4043 const TemplateArgumentListInfo *TemplateArgs) {
4044
4045 DeclResult Decl = CheckVarTemplateId(Template, TemplateLoc, NameInfo.getLoc(),
4046 *TemplateArgs);
4047 if (Decl.isInvalid())
4048 return ExprError();
4049
4050 VarDecl *Var = cast<VarDecl>(Decl.get());
4051 if (!Var->getTemplateSpecializationKind())
4052 Var->setTemplateSpecializationKind(TSK_ImplicitInstantiation,
4053 NameInfo.getLoc());
4054
4055 // Build an ordinary singleton decl ref.
4056 return BuildDeclarationNameExpr(SS, NameInfo, Var,
4057 /*FoundD=*/nullptr, TemplateArgs);
4058}
4059
4060void Sema::diagnoseMissingTemplateArguments(TemplateName Name,
4061 SourceLocation Loc) {
4062 Diag(Loc, diag::err_template_missing_args)
4063 << (int)getTemplateNameKindForDiagnostics(Name) << Name;
4064 if (TemplateDecl *TD = Name.getAsTemplateDecl()) {
4065 Diag(TD->getLocation(), diag::note_template_decl_here)
4066 << TD->getTemplateParameters()->getSourceRange();
4067 }
4068}
4069
4070ExprResult Sema::BuildTemplateIdExpr(const CXXScopeSpec &SS,
4071 SourceLocation TemplateKWLoc,
4072 LookupResult &R,
4073 bool RequiresADL,
4074 const TemplateArgumentListInfo *TemplateArgs) {
4075 // FIXME: Can we do any checking at this point? I guess we could check the
4076 // template arguments that we have against the template name, if the template
4077 // name refers to a single template. That's not a terribly common case,
4078 // though.
4079 // foo<int> could identify a single function unambiguously
4080 // This approach does NOT work, since f<int>(1);
4081 // gets resolved prior to resorting to overload resolution
4082 // i.e., template<class T> void f(double);
4083 // vs template<class T, class U> void f(U);
4084
4085 // These should be filtered out by our callers.
4086 assert(!R.empty() && "empty lookup results when building templateid")(static_cast <bool> (!R.empty() && "empty lookup results when building templateid"
) ? void (0) : __assert_fail ("!R.empty() && \"empty lookup results when building templateid\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4086, __extension__ __PRETTY_FUNCTION__))
;
4087 assert(!R.isAmbiguous() && "ambiguous lookup when building templateid")(static_cast <bool> (!R.isAmbiguous() && "ambiguous lookup when building templateid"
) ? void (0) : __assert_fail ("!R.isAmbiguous() && \"ambiguous lookup when building templateid\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4087, __extension__ __PRETTY_FUNCTION__))
;
4088
4089 // Non-function templates require a template argument list.
4090 if (auto *TD = R.getAsSingle<TemplateDecl>()) {
4091 if (!TemplateArgs && !isa<FunctionTemplateDecl>(TD)) {
4092 diagnoseMissingTemplateArguments(TemplateName(TD), R.getNameLoc());
4093 return ExprError();
4094 }
4095 }
4096
4097 auto AnyDependentArguments = [&]() -> bool {
4098 bool InstantiationDependent;
4099 return TemplateArgs &&
4100 TemplateSpecializationType::anyDependentTemplateArguments(
4101 *TemplateArgs, InstantiationDependent);
4102 };
4103
4104 // In C++1y, check variable template ids.
4105 if (R.getAsSingle<VarTemplateDecl>() && !AnyDependentArguments()) {
4106 return CheckVarTemplateId(SS, R.getLookupNameInfo(),
4107 R.getAsSingle<VarTemplateDecl>(),
4108 TemplateKWLoc, TemplateArgs);
4109 }
4110
4111 // We don't want lookup warnings at this point.
4112 R.suppressDiagnostics();
4113
4114 UnresolvedLookupExpr *ULE
4115 = UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
4116 SS.getWithLocInContext(Context),
4117 TemplateKWLoc,
4118 R.getLookupNameInfo(),
4119 RequiresADL, TemplateArgs,
4120 R.begin(), R.end());
4121
4122 return ULE;
4123}
4124
4125// We actually only call this from template instantiation.
4126ExprResult
4127Sema::BuildQualifiedTemplateIdExpr(CXXScopeSpec &SS,
4128 SourceLocation TemplateKWLoc,
4129 const DeclarationNameInfo &NameInfo,
4130 const TemplateArgumentListInfo *TemplateArgs) {
4131
4132 assert(TemplateArgs || TemplateKWLoc.isValid())(static_cast <bool> (TemplateArgs || TemplateKWLoc.isValid
()) ? void (0) : __assert_fail ("TemplateArgs || TemplateKWLoc.isValid()"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4132, __extension__ __PRETTY_FUNCTION__))
;
4133 DeclContext *DC;
4134 if (!(DC = computeDeclContext(SS, false)) ||
4135 DC->isDependentContext() ||
4136 RequireCompleteDeclContext(SS, DC))
4137 return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs);
4138
4139 bool MemberOfUnknownSpecialization;
4140 LookupResult R(*this, NameInfo, LookupOrdinaryName);
4141 if (LookupTemplateName(R, (Scope *)nullptr, SS, QualType(),
4142 /*Entering*/false, MemberOfUnknownSpecialization,
4143 TemplateKWLoc))
4144 return ExprError();
4145
4146 if (R.isAmbiguous())
4147 return ExprError();
4148
4149 if (R.empty()) {
4150 Diag(NameInfo.getLoc(), diag::err_no_member)
4151 << NameInfo.getName() << DC << SS.getRange();
4152 return ExprError();
4153 }
4154
4155 if (ClassTemplateDecl *Temp = R.getAsSingle<ClassTemplateDecl>()) {
4156 Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_class_template)
4157 << SS.getScopeRep()
4158 << NameInfo.getName().getAsString() << SS.getRange();
4159 Diag(Temp->getLocation(), diag::note_referenced_class_template);
4160 return ExprError();
4161 }
4162
4163 return BuildTemplateIdExpr(SS, TemplateKWLoc, R, /*ADL*/ false, TemplateArgs);
4164}
4165
4166/// Form a dependent template name.
4167///
4168/// This action forms a dependent template name given the template
4169/// name and its (presumably dependent) scope specifier. For
4170/// example, given "MetaFun::template apply", the scope specifier \p
4171/// SS will be "MetaFun::", \p TemplateKWLoc contains the location
4172/// of the "template" keyword, and "apply" is the \p Name.
4173TemplateNameKind Sema::ActOnDependentTemplateName(Scope *S,
4174 CXXScopeSpec &SS,
4175 SourceLocation TemplateKWLoc,
4176 const UnqualifiedId &Name,
4177 ParsedType ObjectType,
4178 bool EnteringContext,
4179 TemplateTy &Result,
4180 bool AllowInjectedClassName) {
4181 if (TemplateKWLoc.isValid() && S && !S->getTemplateParamParent())
4182 Diag(TemplateKWLoc,
4183 getLangOpts().CPlusPlus11 ?
4184 diag::warn_cxx98_compat_template_outside_of_template :
4185 diag::ext_template_outside_of_template)
4186 << FixItHint::CreateRemoval(TemplateKWLoc);
4187
4188 DeclContext *LookupCtx = nullptr;
4189 if (SS.isSet())
4190 LookupCtx = computeDeclContext(SS, EnteringContext);
4191 if (!LookupCtx && ObjectType)
4192 LookupCtx = computeDeclContext(ObjectType.get());
4193 if (LookupCtx) {
4194 // C++0x [temp.names]p5:
4195 // If a name prefixed by the keyword template is not the name of
4196 // a template, the program is ill-formed. [Note: the keyword
4197 // template may not be applied to non-template members of class
4198 // templates. -end note ] [ Note: as is the case with the
4199 // typename prefix, the template prefix is allowed in cases
4200 // where it is not strictly necessary; i.e., when the
4201 // nested-name-specifier or the expression on the left of the ->
4202 // or . is not dependent on a template-parameter, or the use
4203 // does not appear in the scope of a template. -end note]
4204 //
4205 // Note: C++03 was more strict here, because it banned the use of
4206 // the "template" keyword prior to a template-name that was not a
4207 // dependent name. C++ DR468 relaxed this requirement (the
4208 // "template" keyword is now permitted). We follow the C++0x
4209 // rules, even in C++03 mode with a warning, retroactively applying the DR.
4210 bool MemberOfUnknownSpecialization;
4211 TemplateNameKind TNK = isTemplateName(S, SS, TemplateKWLoc.isValid(), Name,
4212 ObjectType, EnteringContext, Result,
4213 MemberOfUnknownSpecialization);
4214 if (TNK == TNK_Non_template && MemberOfUnknownSpecialization) {
4215 // This is a dependent template. Handle it below.
4216 } else if (TNK == TNK_Non_template) {
4217 // Do the lookup again to determine if this is a "nothing found" case or
4218 // a "not a template" case. FIXME: Refactor isTemplateName so we don't
4219 // need to do this.
4220 DeclarationNameInfo DNI = GetNameFromUnqualifiedId(Name);
4221 LookupResult R(*this, DNI.getName(), Name.getLocStart(),
4222 LookupOrdinaryName);
4223 bool MOUS;
4224 if (!LookupTemplateName(R, S, SS, ObjectType.get(), EnteringContext,
4225 MOUS, TemplateKWLoc))
4226 Diag(Name.getLocStart(), diag::err_no_member)
4227 << DNI.getName() << LookupCtx << SS.getRange();
4228 return TNK_Non_template;
4229 } else {
4230 // We found something; return it.
4231 auto *LookupRD = dyn_cast<CXXRecordDecl>(LookupCtx);
4232 if (!AllowInjectedClassName && SS.isSet() && LookupRD &&
4233 Name.getKind() == UnqualifiedIdKind::IK_Identifier &&
4234 Name.Identifier && LookupRD->getIdentifier() == Name.Identifier) {
4235 // C++14 [class.qual]p2:
4236 // In a lookup in which function names are not ignored and the
4237 // nested-name-specifier nominates a class C, if the name specified
4238 // [...] is the injected-class-name of C, [...] the name is instead
4239 // considered to name the constructor
4240 //
4241 // We don't get here if naming the constructor would be valid, so we
4242 // just reject immediately and recover by treating the
4243 // injected-class-name as naming the template.
4244 Diag(Name.getLocStart(),
4245 diag::ext_out_of_line_qualified_id_type_names_constructor)
4246 << Name.Identifier << 0 /*injected-class-name used as template name*/
4247 << 1 /*'template' keyword was used*/;
4248 }
4249 return TNK;
4250 }
4251 }
4252
4253 NestedNameSpecifier *Qualifier = SS.getScopeRep();
4254
4255 switch (Name.getKind()) {
4256 case UnqualifiedIdKind::IK_Identifier:
4257 Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier,
4258 Name.Identifier));
4259 return TNK_Dependent_template_name;
4260
4261 case UnqualifiedIdKind::IK_OperatorFunctionId:
4262 Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier,
4263 Name.OperatorFunctionId.Operator));
4264 return TNK_Function_template;
4265
4266 case UnqualifiedIdKind::IK_LiteralOperatorId:
4267 llvm_unreachable("literal operator id cannot have a dependent scope")::llvm::llvm_unreachable_internal("literal operator id cannot have a dependent scope"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4267)
;
4268
4269 default:
4270 break;
4271 }
4272
4273 Diag(Name.getLocStart(),
4274 diag::err_template_kw_refers_to_non_template)
4275 << GetNameFromUnqualifiedId(Name).getName()
4276 << Name.getSourceRange()
4277 << TemplateKWLoc;
4278 return TNK_Non_template;
4279}
4280
4281bool Sema::CheckTemplateTypeArgument(TemplateTypeParmDecl *Param,
4282 TemplateArgumentLoc &AL,
4283 SmallVectorImpl<TemplateArgument> &Converted) {
4284 const TemplateArgument &Arg = AL.getArgument();
4285 QualType ArgType;
4286 TypeSourceInfo *TSI = nullptr;
4287
4288 // Check template type parameter.
4289 switch(Arg.getKind()) {
4290 case TemplateArgument::Type:
4291 // C++ [temp.arg.type]p1:
4292 // A template-argument for a template-parameter which is a
4293 // type shall be a type-id.
4294 ArgType = Arg.getAsType();
4295 TSI = AL.getTypeSourceInfo();
4296 break;
4297 case TemplateArgument::Template:
4298 case TemplateArgument::TemplateExpansion: {
4299 // We have a template type parameter but the template argument
4300 // is a template without any arguments.
4301 SourceRange SR = AL.getSourceRange();
4302 TemplateName Name = Arg.getAsTemplateOrTemplatePattern();
4303 diagnoseMissingTemplateArguments(Name, SR.getEnd());
4304 return true;
4305 }
4306 case TemplateArgument::Expression: {
4307 // We have a template type parameter but the template argument is an
4308 // expression; see if maybe it is missing the "typename" keyword.
4309 CXXScopeSpec SS;
4310 DeclarationNameInfo NameInfo;
4311
4312 if (DeclRefExpr *ArgExpr = dyn_cast<DeclRefExpr>(Arg.getAsExpr())) {
4313 SS.Adopt(ArgExpr->getQualifierLoc());
4314 NameInfo = ArgExpr->getNameInfo();
4315 } else if (DependentScopeDeclRefExpr *ArgExpr =
4316 dyn_cast<DependentScopeDeclRefExpr>(Arg.getAsExpr())) {
4317 SS.Adopt(ArgExpr->getQualifierLoc());
4318 NameInfo = ArgExpr->getNameInfo();
4319 } else if (CXXDependentScopeMemberExpr *ArgExpr =
4320 dyn_cast<CXXDependentScopeMemberExpr>(Arg.getAsExpr())) {
4321 if (ArgExpr->isImplicitAccess()) {
4322 SS.Adopt(ArgExpr->getQualifierLoc());
4323 NameInfo = ArgExpr->getMemberNameInfo();
4324 }
4325 }
4326
4327 if (auto *II = NameInfo.getName().getAsIdentifierInfo()) {
4328 LookupResult Result(*this, NameInfo, LookupOrdinaryName);
4329 LookupParsedName(Result, CurScope, &SS);
4330
4331 if (Result.getAsSingle<TypeDecl>() ||
4332 Result.getResultKind() ==
4333 LookupResult::NotFoundInCurrentInstantiation) {
4334 // Suggest that the user add 'typename' before the NNS.
4335 SourceLocation Loc = AL.getSourceRange().getBegin();
4336 Diag(Loc, getLangOpts().MSVCCompat
4337 ? diag::ext_ms_template_type_arg_missing_typename
4338 : diag::err_template_arg_must_be_type_suggest)
4339 << FixItHint::CreateInsertion(Loc, "typename ");
4340 Diag(Param->getLocation(), diag::note_template_param_here);
4341
4342 // Recover by synthesizing a type using the location information that we
4343 // already have.
4344 ArgType =
4345 Context.getDependentNameType(ETK_Typename, SS.getScopeRep(), II);
4346 TypeLocBuilder TLB;
4347 DependentNameTypeLoc TL = TLB.push<DependentNameTypeLoc>(ArgType);
4348 TL.setElaboratedKeywordLoc(SourceLocation(/*synthesized*/));
4349 TL.setQualifierLoc(SS.getWithLocInContext(Context));
4350 TL.setNameLoc(NameInfo.getLoc());
4351 TSI = TLB.getTypeSourceInfo(Context, ArgType);
4352
4353 // Overwrite our input TemplateArgumentLoc so that we can recover
4354 // properly.
4355 AL = TemplateArgumentLoc(TemplateArgument(ArgType),
4356 TemplateArgumentLocInfo(TSI));
4357
4358 break;
4359 }
4360 }
4361 // fallthrough
4362 LLVM_FALLTHROUGH[[clang::fallthrough]];
4363 }
4364 default: {
4365 // We have a template type parameter but the template argument
4366 // is not a type.
4367 SourceRange SR = AL.getSourceRange();
4368 Diag(SR.getBegin(), diag::err_template_arg_must_be_type) << SR;
4369 Diag(Param->getLocation(), diag::note_template_param_here);
4370
4371 return true;
4372 }
4373 }
4374
4375 if (CheckTemplateArgument(Param, TSI))
4376 return true;
4377
4378 // Add the converted template type argument.
4379 ArgType = Context.getCanonicalType(ArgType);
4380
4381 // Objective-C ARC:
4382 // If an explicitly-specified template argument type is a lifetime type
4383 // with no lifetime qualifier, the __strong lifetime qualifier is inferred.
4384 if (getLangOpts().ObjCAutoRefCount &&
4385 ArgType->isObjCLifetimeType() &&
4386 !ArgType.getObjCLifetime()) {
4387 Qualifiers Qs;
4388 Qs.setObjCLifetime(Qualifiers::OCL_Strong);
4389 ArgType = Context.getQualifiedType(ArgType, Qs);
4390 }
4391
4392 Converted.push_back(TemplateArgument(ArgType));
4393 return false;
4394}
4395
4396/// Substitute template arguments into the default template argument for
4397/// the given template type parameter.
4398///
4399/// \param SemaRef the semantic analysis object for which we are performing
4400/// the substitution.
4401///
4402/// \param Template the template that we are synthesizing template arguments
4403/// for.
4404///
4405/// \param TemplateLoc the location of the template name that started the
4406/// template-id we are checking.
4407///
4408/// \param RAngleLoc the location of the right angle bracket ('>') that
4409/// terminates the template-id.
4410///
4411/// \param Param the template template parameter whose default we are
4412/// substituting into.
4413///
4414/// \param Converted the list of template arguments provided for template
4415/// parameters that precede \p Param in the template parameter list.
4416/// \returns the substituted template argument, or NULL if an error occurred.
4417static TypeSourceInfo *
4418SubstDefaultTemplateArgument(Sema &SemaRef,
4419 TemplateDecl *Template,
4420 SourceLocation TemplateLoc,
4421 SourceLocation RAngleLoc,
4422 TemplateTypeParmDecl *Param,
4423 SmallVectorImpl<TemplateArgument> &Converted) {
4424 TypeSourceInfo *ArgType = Param->getDefaultArgumentInfo();
4425
4426 // If the argument type is dependent, instantiate it now based
4427 // on the previously-computed template arguments.
4428 if (ArgType->getType()->isDependentType()) {
4429 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
4430 Param, Template, Converted,
4431 SourceRange(TemplateLoc, RAngleLoc));
4432 if (Inst.isInvalid())
4433 return nullptr;
4434
4435 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted);
4436
4437 // Only substitute for the innermost template argument list.
4438 MultiLevelTemplateArgumentList TemplateArgLists;
4439 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
4440 for (unsigned i = 0, e = Param->getDepth(); i != e; ++i)
4441 TemplateArgLists.addOuterTemplateArguments(None);
4442
4443 Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext());
4444 ArgType =
4445 SemaRef.SubstType(ArgType, TemplateArgLists,
4446 Param->getDefaultArgumentLoc(), Param->getDeclName());
4447 }
4448
4449 return ArgType;
4450}
4451
4452/// Substitute template arguments into the default template argument for
4453/// the given non-type template parameter.
4454///
4455/// \param SemaRef the semantic analysis object for which we are performing
4456/// the substitution.
4457///
4458/// \param Template the template that we are synthesizing template arguments
4459/// for.
4460///
4461/// \param TemplateLoc the location of the template name that started the
4462/// template-id we are checking.
4463///
4464/// \param RAngleLoc the location of the right angle bracket ('>') that
4465/// terminates the template-id.
4466///
4467/// \param Param the non-type template parameter whose default we are
4468/// substituting into.
4469///
4470/// \param Converted the list of template arguments provided for template
4471/// parameters that precede \p Param in the template parameter list.
4472///
4473/// \returns the substituted template argument, or NULL if an error occurred.
4474static ExprResult
4475SubstDefaultTemplateArgument(Sema &SemaRef,
4476 TemplateDecl *Template,
4477 SourceLocation TemplateLoc,
4478 SourceLocation RAngleLoc,
4479 NonTypeTemplateParmDecl *Param,
4480 SmallVectorImpl<TemplateArgument> &Converted) {
4481 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
4482 Param, Template, Converted,
4483 SourceRange(TemplateLoc, RAngleLoc));
4484 if (Inst.isInvalid())
4485 return ExprError();
4486
4487 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted);
4488
4489 // Only substitute for the innermost template argument list.
4490 MultiLevelTemplateArgumentList TemplateArgLists;
4491 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
4492 for (unsigned i = 0, e = Param->getDepth(); i != e; ++i)
4493 TemplateArgLists.addOuterTemplateArguments(None);
4494
4495 EnterExpressionEvaluationContext ConstantEvaluated(
4496 SemaRef, Sema::ExpressionEvaluationContext::ConstantEvaluated);
4497 return SemaRef.SubstExpr(Param->getDefaultArgument(), TemplateArgLists);
4498}
4499
4500/// Substitute template arguments into the default template argument for
4501/// the given template template parameter.
4502///
4503/// \param SemaRef the semantic analysis object for which we are performing
4504/// the substitution.
4505///
4506/// \param Template the template that we are synthesizing template arguments
4507/// for.
4508///
4509/// \param TemplateLoc the location of the template name that started the
4510/// template-id we are checking.
4511///
4512/// \param RAngleLoc the location of the right angle bracket ('>') that
4513/// terminates the template-id.
4514///
4515/// \param Param the template template parameter whose default we are
4516/// substituting into.
4517///
4518/// \param Converted the list of template arguments provided for template
4519/// parameters that precede \p Param in the template parameter list.
4520///
4521/// \param QualifierLoc Will be set to the nested-name-specifier (with
4522/// source-location information) that precedes the template name.
4523///
4524/// \returns the substituted template argument, or NULL if an error occurred.
4525static TemplateName
4526SubstDefaultTemplateArgument(Sema &SemaRef,
4527 TemplateDecl *Template,
4528 SourceLocation TemplateLoc,
4529 SourceLocation RAngleLoc,
4530 TemplateTemplateParmDecl *Param,
4531 SmallVectorImpl<TemplateArgument> &Converted,
4532 NestedNameSpecifierLoc &QualifierLoc) {
4533 Sema::InstantiatingTemplate Inst(
4534 SemaRef, TemplateLoc, TemplateParameter(Param), Template, Converted,
4535 SourceRange(TemplateLoc, RAngleLoc));
4536 if (Inst.isInvalid())
4537 return TemplateName();
4538
4539 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted);
4540
4541 // Only substitute for the innermost template argument list.
4542 MultiLevelTemplateArgumentList TemplateArgLists;
4543 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
4544 for (unsigned i = 0, e = Param->getDepth(); i != e; ++i)
4545 TemplateArgLists.addOuterTemplateArguments(None);
4546
4547 Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext());
4548 // Substitute into the nested-name-specifier first,
4549 QualifierLoc = Param->getDefaultArgument().getTemplateQualifierLoc();
4550 if (QualifierLoc) {
4551 QualifierLoc =
4552 SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, TemplateArgLists);
4553 if (!QualifierLoc)
4554 return TemplateName();
4555 }
4556
4557 return SemaRef.SubstTemplateName(
4558 QualifierLoc,
4559 Param->getDefaultArgument().getArgument().getAsTemplate(),
4560 Param->getDefaultArgument().getTemplateNameLoc(),
4561 TemplateArgLists);
4562}
4563
4564/// If the given template parameter has a default template
4565/// argument, substitute into that default template argument and
4566/// return the corresponding template argument.
4567TemplateArgumentLoc
4568Sema::SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template,
4569 SourceLocation TemplateLoc,
4570 SourceLocation RAngleLoc,
4571 Decl *Param,
4572 SmallVectorImpl<TemplateArgument>
4573 &Converted,
4574 bool &HasDefaultArg) {
4575 HasDefaultArg = false;
4576
4577 if (TemplateTypeParmDecl *TypeParm = dyn_cast<TemplateTypeParmDecl>(Param)) {
4578 if (!hasVisibleDefaultArgument(TypeParm))
4579 return TemplateArgumentLoc();
4580
4581 HasDefaultArg = true;
4582 TypeSourceInfo *DI = SubstDefaultTemplateArgument(*this, Template,
4583 TemplateLoc,
4584 RAngleLoc,
4585 TypeParm,
4586 Converted);
4587 if (DI)
4588 return TemplateArgumentLoc(TemplateArgument(DI->getType()), DI);
4589
4590 return TemplateArgumentLoc();
4591 }
4592
4593 if (NonTypeTemplateParmDecl *NonTypeParm
4594 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
4595 if (!hasVisibleDefaultArgument(NonTypeParm))
4596 return TemplateArgumentLoc();
4597
4598 HasDefaultArg = true;
4599 ExprResult Arg = SubstDefaultTemplateArgument(*this, Template,
4600 TemplateLoc,
4601 RAngleLoc,
4602 NonTypeParm,
4603 Converted);
4604 if (Arg.isInvalid())
4605 return TemplateArgumentLoc();
4606
4607 Expr *ArgE = Arg.getAs<Expr>();
4608 return TemplateArgumentLoc(TemplateArgument(ArgE), ArgE);
4609 }
4610
4611 TemplateTemplateParmDecl *TempTempParm
4612 = cast<TemplateTemplateParmDecl>(Param);
4613 if (!hasVisibleDefaultArgument(TempTempParm))
4614 return TemplateArgumentLoc();
4615
4616 HasDefaultArg = true;
4617 NestedNameSpecifierLoc QualifierLoc;
4618 TemplateName TName = SubstDefaultTemplateArgument(*this, Template,
4619 TemplateLoc,
4620 RAngleLoc,
4621 TempTempParm,
4622 Converted,
4623 QualifierLoc);
4624 if (TName.isNull())
4625 return TemplateArgumentLoc();
4626
4627 return TemplateArgumentLoc(TemplateArgument(TName),
4628 TempTempParm->getDefaultArgument().getTemplateQualifierLoc(),
4629 TempTempParm->getDefaultArgument().getTemplateNameLoc());
4630}
4631
4632/// Convert a template-argument that we parsed as a type into a template, if
4633/// possible. C++ permits injected-class-names to perform dual service as
4634/// template template arguments and as template type arguments.
4635static TemplateArgumentLoc convertTypeTemplateArgumentToTemplate(TypeLoc TLoc) {
4636 // Extract and step over any surrounding nested-name-specifier.
4637 NestedNameSpecifierLoc QualLoc;
4638 if (auto ETLoc = TLoc.getAs<ElaboratedTypeLoc>()) {
4639 if (ETLoc.getTypePtr()->getKeyword() != ETK_None)
4640 return TemplateArgumentLoc();
4641
4642 QualLoc = ETLoc.getQualifierLoc();
4643 TLoc = ETLoc.getNamedTypeLoc();
4644 }
4645
4646 // If this type was written as an injected-class-name, it can be used as a
4647 // template template argument.
4648 if (auto InjLoc = TLoc.getAs<InjectedClassNameTypeLoc>())
4649 return TemplateArgumentLoc(InjLoc.getTypePtr()->getTemplateName(),
4650 QualLoc, InjLoc.getNameLoc());
4651
4652 // If this type was written as an injected-class-name, it may have been
4653 // converted to a RecordType during instantiation. If the RecordType is
4654 // *not* wrapped in a TemplateSpecializationType and denotes a class
4655 // template specialization, it must have come from an injected-class-name.
4656 if (auto RecLoc = TLoc.getAs<RecordTypeLoc>())
4657 if (auto *CTSD =
4658 dyn_cast<ClassTemplateSpecializationDecl>(RecLoc.getDecl()))
4659 return TemplateArgumentLoc(TemplateName(CTSD->getSpecializedTemplate()),
4660 QualLoc, RecLoc.getNameLoc());
4661
4662 return TemplateArgumentLoc();
4663}
4664
4665/// Check that the given template argument corresponds to the given
4666/// template parameter.
4667///
4668/// \param Param The template parameter against which the argument will be
4669/// checked.
4670///
4671/// \param Arg The template argument, which may be updated due to conversions.
4672///
4673/// \param Template The template in which the template argument resides.
4674///
4675/// \param TemplateLoc The location of the template name for the template
4676/// whose argument list we're matching.
4677///
4678/// \param RAngleLoc The location of the right angle bracket ('>') that closes
4679/// the template argument list.
4680///
4681/// \param ArgumentPackIndex The index into the argument pack where this
4682/// argument will be placed. Only valid if the parameter is a parameter pack.
4683///
4684/// \param Converted The checked, converted argument will be added to the
4685/// end of this small vector.
4686///
4687/// \param CTAK Describes how we arrived at this particular template argument:
4688/// explicitly written, deduced, etc.
4689///
4690/// \returns true on error, false otherwise.
4691bool Sema::CheckTemplateArgument(NamedDecl *Param,
4692 TemplateArgumentLoc &Arg,
4693 NamedDecl *Template,
4694 SourceLocation TemplateLoc,
4695 SourceLocation RAngleLoc,
4696 unsigned ArgumentPackIndex,
4697 SmallVectorImpl<TemplateArgument> &Converted,
4698 CheckTemplateArgumentKind CTAK) {
4699 // Check template type parameters.
4700 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param))
4701 return CheckTemplateTypeArgument(TTP, Arg, Converted);
4702
4703 // Check non-type template parameters.
4704 if (NonTypeTemplateParmDecl *NTTP =dyn_cast<NonTypeTemplateParmDecl>(Param)) {
4705 // Do substitution on the type of the non-type template parameter
4706 // with the template arguments we've seen thus far. But if the
4707 // template has a dependent context then we cannot substitute yet.
4708 QualType NTTPType = NTTP->getType();
4709 if (NTTP->isParameterPack() && NTTP->isExpandedParameterPack())
4710 NTTPType = NTTP->getExpansionType(ArgumentPackIndex);
4711
4712 // FIXME: Do we need to substitute into parameters here if they're
4713 // instantiation-dependent but not dependent?
4714 if (NTTPType->isDependentType() &&
4715 !isa<TemplateTemplateParmDecl>(Template) &&
4716 !Template->getDeclContext()->isDependentContext()) {
4717 // Do substitution on the type of the non-type template parameter.
4718 InstantiatingTemplate Inst(*this, TemplateLoc, Template,
4719 NTTP, Converted,
4720 SourceRange(TemplateLoc, RAngleLoc));
4721 if (Inst.isInvalid())
4722 return true;
4723
4724 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
4725 Converted);
4726 NTTPType = SubstType(NTTPType,
4727 MultiLevelTemplateArgumentList(TemplateArgs),
4728 NTTP->getLocation(),
4729 NTTP->getDeclName());
4730 // If that worked, check the non-type template parameter type
4731 // for validity.
4732 if (!NTTPType.isNull())
4733 NTTPType = CheckNonTypeTemplateParameterType(NTTPType,
4734 NTTP->getLocation());
4735 if (NTTPType.isNull())
4736 return true;
4737 }
4738
4739 switch (Arg.getArgument().getKind()) {
4740 case TemplateArgument::Null:
4741 llvm_unreachable("Should never see a NULL template argument here")::llvm::llvm_unreachable_internal("Should never see a NULL template argument here"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4741)
;
4742
4743 case TemplateArgument::Expression: {
4744 TemplateArgument Result;
4745 unsigned CurSFINAEErrors = NumSFINAEErrors;
4746 ExprResult Res =
4747 CheckTemplateArgument(NTTP, NTTPType, Arg.getArgument().getAsExpr(),
4748 Result, CTAK);
4749 if (Res.isInvalid())
4750 return true;
4751 // If the current template argument causes an error, give up now.
4752 if (CurSFINAEErrors < NumSFINAEErrors)
4753 return true;
4754
4755 // If the resulting expression is new, then use it in place of the
4756 // old expression in the template argument.
4757 if (Res.get() != Arg.getArgument().getAsExpr()) {
4758 TemplateArgument TA(Res.get());
4759 Arg = TemplateArgumentLoc(TA, Res.get());
4760 }
4761
4762 Converted.push_back(Result);
4763 break;
4764 }
4765
4766 case TemplateArgument::Declaration:
4767 case TemplateArgument::Integral:
4768 case TemplateArgument::NullPtr:
4769 // We've already checked this template argument, so just copy
4770 // it to the list of converted arguments.
4771 Converted.push_back(Arg.getArgument());
4772 break;
4773
4774 case TemplateArgument::Template:
4775 case TemplateArgument::TemplateExpansion:
4776 // We were given a template template argument. It may not be ill-formed;
4777 // see below.
4778 if (DependentTemplateName *DTN
4779 = Arg.getArgument().getAsTemplateOrTemplatePattern()
4780 .getAsDependentTemplateName()) {
4781 // We have a template argument such as \c T::template X, which we
4782 // parsed as a template template argument. However, since we now
4783 // know that we need a non-type template argument, convert this
4784 // template name into an expression.
4785
4786 DeclarationNameInfo NameInfo(DTN->getIdentifier(),
4787 Arg.getTemplateNameLoc());
4788
4789 CXXScopeSpec SS;
4790 SS.Adopt(Arg.getTemplateQualifierLoc());
4791 // FIXME: the template-template arg was a DependentTemplateName,
4792 // so it was provided with a template keyword. However, its source
4793 // location is not stored in the template argument structure.
4794 SourceLocation TemplateKWLoc;
4795 ExprResult E = DependentScopeDeclRefExpr::Create(
4796 Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo,
4797 nullptr);
4798
4799 // If we parsed the template argument as a pack expansion, create a
4800 // pack expansion expression.
4801 if (Arg.getArgument().getKind() == TemplateArgument::TemplateExpansion){
4802 E = ActOnPackExpansion(E.get(), Arg.getTemplateEllipsisLoc());
4803 if (E.isInvalid())
4804 return true;
4805 }
4806
4807 TemplateArgument Result;
4808 E = CheckTemplateArgument(NTTP, NTTPType, E.get(), Result);
4809 if (E.isInvalid())
4810 return true;
4811
4812 Converted.push_back(Result);
4813 break;
4814 }
4815
4816 // We have a template argument that actually does refer to a class
4817 // template, alias template, or template template parameter, and
4818 // therefore cannot be a non-type template argument.
4819 Diag(Arg.getLocation(), diag::err_template_arg_must_be_expr)
4820 << Arg.getSourceRange();
4821
4822 Diag(Param->getLocation(), diag::note_template_param_here);
4823 return true;
4824
4825 case TemplateArgument::Type: {
4826 // We have a non-type template parameter but the template
4827 // argument is a type.
4828
4829 // C++ [temp.arg]p2:
4830 // In a template-argument, an ambiguity between a type-id and
4831 // an expression is resolved to a type-id, regardless of the
4832 // form of the corresponding template-parameter.
4833 //
4834 // We warn specifically about this case, since it can be rather
4835 // confusing for users.
4836 QualType T = Arg.getArgument().getAsType();
4837 SourceRange SR = Arg.getSourceRange();
4838 if (T->isFunctionType())
4839 Diag(SR.getBegin(), diag::err_template_arg_nontype_ambig) << SR << T;
4840 else
4841 Diag(SR.getBegin(), diag::err_template_arg_must_be_expr) << SR;
4842 Diag(Param->getLocation(), diag::note_template_param_here);
4843 return true;
4844 }
4845
4846 case TemplateArgument::Pack:
4847 llvm_unreachable("Caller must expand template argument packs")::llvm::llvm_unreachable_internal("Caller must expand template argument packs"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4847)
;
4848 }
4849
4850 return false;
4851 }
4852
4853
4854 // Check template template parameters.
4855 TemplateTemplateParmDecl *TempParm = cast<TemplateTemplateParmDecl>(Param);
4856
4857 TemplateParameterList *Params = TempParm->getTemplateParameters();
4858 if (TempParm->isExpandedParameterPack())
4859 Params = TempParm->getExpansionTemplateParameters(ArgumentPackIndex);
4860
4861 // Substitute into the template parameter list of the template
4862 // template parameter, since previously-supplied template arguments
4863 // may appear within the template template parameter.
4864 //
4865 // FIXME: Skip this if the parameters aren't instantiation-dependent.
4866 {
4867 // Set up a template instantiation context.
4868 LocalInstantiationScope Scope(*this);
4869 InstantiatingTemplate Inst(*this, TemplateLoc, Template,
4870 TempParm, Converted,
4871 SourceRange(TemplateLoc, RAngleLoc));
4872 if (Inst.isInvalid())
4873 return true;
4874
4875 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted);
4876 Params = SubstTemplateParams(Params, CurContext,
4877 MultiLevelTemplateArgumentList(TemplateArgs));
4878 if (!Params)
4879 return true;
4880 }
4881
4882 // C++1z [temp.local]p1: (DR1004)
4883 // When [the injected-class-name] is used [...] as a template-argument for
4884 // a template template-parameter [...] it refers to the class template
4885 // itself.
4886 if (Arg.getArgument().getKind() == TemplateArgument::Type) {
4887 TemplateArgumentLoc ConvertedArg = convertTypeTemplateArgumentToTemplate(
4888 Arg.getTypeSourceInfo()->getTypeLoc());
4889 if (!ConvertedArg.getArgument().isNull())
4890 Arg = ConvertedArg;
4891 }
4892
4893 switch (Arg.getArgument().getKind()) {
4894 case TemplateArgument::Null:
4895 llvm_unreachable("Should never see a NULL template argument here")::llvm::llvm_unreachable_internal("Should never see a NULL template argument here"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4895)
;
4896
4897 case TemplateArgument::Template:
4898 case TemplateArgument::TemplateExpansion:
4899 if (CheckTemplateTemplateArgument(Params, Arg))
4900 return true;
4901
4902 Converted.push_back(Arg.getArgument());
4903 break;
4904
4905 case TemplateArgument::Expression:
4906 case TemplateArgument::Type:
4907 // We have a template template parameter but the template
4908 // argument does not refer to a template.
4909 Diag(Arg.getLocation(), diag::err_template_arg_must_be_template)
4910 << getLangOpts().CPlusPlus11;
4911 return true;
4912
4913 case TemplateArgument::Declaration:
4914 llvm_unreachable("Declaration argument with template template parameter")::llvm::llvm_unreachable_internal("Declaration argument with template template parameter"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4914)
;
4915 case TemplateArgument::Integral:
4916 llvm_unreachable("Integral argument with template template parameter")::llvm::llvm_unreachable_internal("Integral argument with template template parameter"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4916)
;
4917 case TemplateArgument::NullPtr:
4918 llvm_unreachable("Null pointer argument with template template parameter")::llvm::llvm_unreachable_internal("Null pointer argument with template template parameter"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4918)
;
4919
4920 case TemplateArgument::Pack:
4921 llvm_unreachable("Caller must expand template argument packs")::llvm::llvm_unreachable_internal("Caller must expand template argument packs"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4921)
;
4922 }
4923
4924 return false;
4925}
4926
4927/// Check whether the template parameter is a pack expansion, and if so,
4928/// determine the number of parameters produced by that expansion. For instance:
4929///
4930/// \code
4931/// template<typename ...Ts> struct A {
4932/// template<Ts ...NTs, template<Ts> class ...TTs, typename ...Us> struct B;
4933/// };
4934/// \endcode
4935///
4936/// In \c A<int,int>::B, \c NTs and \c TTs have expanded pack size 2, and \c Us
4937/// is not a pack expansion, so returns an empty Optional.
4938static Optional<unsigned> getExpandedPackSize(NamedDecl *Param) {
4939 if (NonTypeTemplateParmDecl *NTTP
4940 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
4941 if (NTTP->isExpandedParameterPack())
4942 return NTTP->getNumExpansionTypes();
4943 }
4944
4945 if (TemplateTemplateParmDecl *TTP
4946 = dyn_cast<TemplateTemplateParmDecl>(Param)) {
4947 if (TTP->isExpandedParameterPack())
4948 return TTP->getNumExpansionTemplateParameters();
4949 }
4950
4951 return None;
4952}
4953
4954/// Diagnose a missing template argument.
4955template<typename TemplateParmDecl>
4956static bool diagnoseMissingArgument(Sema &S, SourceLocation Loc,
4957 TemplateDecl *TD,
4958 const TemplateParmDecl *D,
4959 TemplateArgumentListInfo &Args) {
4960 // Dig out the most recent declaration of the template parameter; there may be
4961 // declarations of the template that are more recent than TD.
4962 D = cast<TemplateParmDecl>(cast<TemplateDecl>(TD->getMostRecentDecl())
4963 ->getTemplateParameters()
4964 ->getParam(D->getIndex()));
4965
4966 // If there's a default argument that's not visible, diagnose that we're
4967 // missing a module import.
4968 llvm::SmallVector<Module*, 8> Modules;
4969 if (D->hasDefaultArgument() && !S.hasVisibleDefaultArgument(D, &Modules)) {
4970 S.diagnoseMissingImport(Loc, cast<NamedDecl>(TD),
4971 D->getDefaultArgumentLoc(), Modules,
4972 Sema::MissingImportKind::DefaultArgument,
4973 /*Recover*/true);
4974 return true;
4975 }
4976
4977 // FIXME: If there's a more recent default argument that *is* visible,
4978 // diagnose that it was declared too late.
4979
4980 TemplateParameterList *Params = TD->getTemplateParameters();
4981
4982 S.Diag(Loc, diag::err_template_arg_list_different_arity)
4983 << /*not enough args*/0
4984 << (int)S.getTemplateNameKindForDiagnostics(TemplateName(TD))
4985 << TD;
4986 S.Diag(TD->getLocation(), diag::note_template_decl_here)
4987 << Params->getSourceRange();
4988 return true;
4989}
4990
4991/// Check that the given template argument list is well-formed
4992/// for specializing the given template.
4993bool Sema::CheckTemplateArgumentList(
4994 TemplateDecl *Template, SourceLocation TemplateLoc,
4995 TemplateArgumentListInfo &TemplateArgs, bool PartialTemplateArgs,
4996 SmallVectorImpl<TemplateArgument> &Converted,
4997 bool UpdateArgsWithConversions) {
4998 // Make a copy of the template arguments for processing. Only make the
4999 // changes at the end when successful in matching the arguments to the
5000 // template.
5001 TemplateArgumentListInfo NewArgs = TemplateArgs;
5002
5003 // Make sure we get the template parameter list from the most
5004 // recentdeclaration, since that is the only one that has is guaranteed to
5005 // have all the default template argument information.
5006 TemplateParameterList *Params =
5007 cast<TemplateDecl>(Template->getMostRecentDecl())
5008 ->getTemplateParameters();
5009
5010 SourceLocation RAngleLoc = NewArgs.getRAngleLoc();
5011
5012 // C++ [temp.arg]p1:
5013 // [...] The type and form of each template-argument specified in
5014 // a template-id shall match the type and form specified for the
5015 // corresponding parameter declared by the template in its
5016 // template-parameter-list.
5017 bool isTemplateTemplateParameter = isa<TemplateTemplateParmDecl>(Template);
5018 SmallVector<TemplateArgument, 2> ArgumentPack;
5019 unsigned ArgIdx = 0, NumArgs = NewArgs.size();
5020 LocalInstantiationScope InstScope(*this, true);
5021 for (TemplateParameterList::iterator Param = Params->begin(),
5022 ParamEnd = Params->end();
5023 Param != ParamEnd; /* increment in loop */) {
5024 // If we have an expanded parameter pack, make sure we don't have too
5025 // many arguments.
5026 if (Optional<unsigned> Expansions = getExpandedPackSize(*Param)) {
5027 if (*Expansions == ArgumentPack.size()) {
5028 // We're done with this parameter pack. Pack up its arguments and add
5029 // them to the list.
5030 Converted.push_back(
5031 TemplateArgument::CreatePackCopy(Context, ArgumentPack));
5032 ArgumentPack.clear();
5033
5034 // This argument is assigned to the next parameter.
5035 ++Param;
5036 continue;
5037 } else if (ArgIdx == NumArgs && !PartialTemplateArgs) {
5038 // Not enough arguments for this parameter pack.
5039 Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
5040 << /*not enough args*/0
5041 << (int)getTemplateNameKindForDiagnostics(TemplateName(Template))
5042 << Template;
5043 Diag(Template->getLocation(), diag::note_template_decl_here)
5044 << Params->getSourceRange();
5045 return true;
5046 }
5047 }
5048
5049 if (ArgIdx < NumArgs) {
5050 // Check the template argument we were given.
5051 if (CheckTemplateArgument(*Param, NewArgs[ArgIdx], Template,
5052 TemplateLoc, RAngleLoc,
5053 ArgumentPack.size(), Converted))
5054 return true;
5055
5056 bool PackExpansionIntoNonPack =
5057 NewArgs[ArgIdx].getArgument().isPackExpansion() &&
5058 (!(*Param)->isTemplateParameterPack() || getExpandedPackSize(*Param));
5059 if (PackExpansionIntoNonPack && isa<TypeAliasTemplateDecl>(Template)) {
5060 // Core issue 1430: we have a pack expansion as an argument to an
5061 // alias template, and it's not part of a parameter pack. This
5062 // can't be canonicalized, so reject it now.
5063 Diag(NewArgs[ArgIdx].getLocation(),
5064 diag::err_alias_template_expansion_into_fixed_list)
5065 << NewArgs[ArgIdx].getSourceRange();
5066 Diag((*Param)->getLocation(), diag::note_template_param_here);
5067 return true;
5068 }
5069
5070 // We're now done with this argument.
5071 ++ArgIdx;
5072
5073 if ((*Param)->isTemplateParameterPack()) {
5074 // The template parameter was a template parameter pack, so take the
5075 // deduced argument and place it on the argument pack. Note that we
5076 // stay on the same template parameter so that we can deduce more
5077 // arguments.
5078 ArgumentPack.push_back(Converted.pop_back_val());
5079 } else {
5080 // Move to the next template parameter.
5081 ++Param;
5082 }
5083
5084 // If we just saw a pack expansion into a non-pack, then directly convert
5085 // the remaining arguments, because we don't know what parameters they'll
5086 // match up with.
5087 if (PackExpansionIntoNonPack) {
5088 if (!ArgumentPack.empty()) {
5089 // If we were part way through filling in an expanded parameter pack,
5090 // fall back to just producing individual arguments.
5091 Converted.insert(Converted.end(),
5092 ArgumentPack.begin(), ArgumentPack.end());
5093 ArgumentPack.clear();
5094 }
5095
5096 while (ArgIdx < NumArgs) {
5097 Converted.push_back(NewArgs[ArgIdx].getArgument());
5098 ++ArgIdx;
5099 }
5100
5101 return false;
5102 }
5103
5104 continue;
5105 }
5106
5107 // If we're checking a partial template argument list, we're done.
5108 if (PartialTemplateArgs) {
5109 if ((*Param)->isTemplateParameterPack() && !ArgumentPack.empty())
5110 Converted.push_back(
5111 TemplateArgument::CreatePackCopy(Context, ArgumentPack));
5112
5113 return false;
5114 }
5115
5116 // If we have a template parameter pack with no more corresponding
5117 // arguments, just break out now and we'll fill in the argument pack below.
5118 if ((*Param)->isTemplateParameterPack()) {
5119 assert(!getExpandedPackSize(*Param) &&(static_cast <bool> (!getExpandedPackSize(*Param) &&
"Should have dealt with this already") ? void (0) : __assert_fail
("!getExpandedPackSize(*Param) && \"Should have dealt with this already\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5120, __extension__ __PRETTY_FUNCTION__))
5120 "Should have dealt with this already")(static_cast <bool> (!getExpandedPackSize(*Param) &&
"Should have dealt with this already") ? void (0) : __assert_fail
("!getExpandedPackSize(*Param) && \"Should have dealt with this already\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5120, __extension__ __PRETTY_FUNCTION__))
;
5121
5122 // A non-expanded parameter pack before the end of the parameter list
5123 // only occurs for an ill-formed template parameter list, unless we've
5124 // got a partial argument list for a function template, so just bail out.
5125 if (Param + 1 != ParamEnd)
5126 return true;
5127
5128 Converted.push_back(
5129 TemplateArgument::CreatePackCopy(Context, ArgumentPack));
5130 ArgumentPack.clear();
5131
5132 ++Param;
5133 continue;
5134 }
5135
5136 // Check whether we have a default argument.
5137 TemplateArgumentLoc Arg;
5138
5139 // Retrieve the default template argument from the template
5140 // parameter. For each kind of template parameter, we substitute the
5141 // template arguments provided thus far and any "outer" template arguments
5142 // (when the template parameter was part of a nested template) into
5143 // the default argument.
5144 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*Param)) {
5145 if (!hasVisibleDefaultArgument(TTP))
5146 return diagnoseMissingArgument(*this, TemplateLoc, Template, TTP,
5147 NewArgs);
5148
5149 TypeSourceInfo *ArgType = SubstDefaultTemplateArgument(*this,
5150 Template,
5151 TemplateLoc,
5152 RAngleLoc,
5153 TTP,
5154 Converted);
5155 if (!ArgType)
5156 return true;
5157
5158 Arg = TemplateArgumentLoc(TemplateArgument(ArgType->getType()),
5159 ArgType);
5160 } else if (NonTypeTemplateParmDecl *NTTP
5161 = dyn_cast<NonTypeTemplateParmDecl>(*Param)) {
5162 if (!hasVisibleDefaultArgument(NTTP))
5163 return diagnoseMissingArgument(*this, TemplateLoc, Template, NTTP,
5164 NewArgs);
5165
5166 ExprResult E = SubstDefaultTemplateArgument(*this, Template,
5167 TemplateLoc,
5168 RAngleLoc,
5169 NTTP,
5170 Converted);
5171 if (E.isInvalid())
5172 return true;
5173
5174 Expr *Ex = E.getAs<Expr>();
5175 Arg = TemplateArgumentLoc(TemplateArgument(Ex), Ex);
5176 } else {
5177 TemplateTemplateParmDecl *TempParm
5178 = cast<TemplateTemplateParmDecl>(*Param);
5179
5180 if (!hasVisibleDefaultArgument(TempParm))
5181 return diagnoseMissingArgument(*this, TemplateLoc, Template, TempParm,
5182 NewArgs);
5183
5184 NestedNameSpecifierLoc QualifierLoc;
5185 TemplateName Name = SubstDefaultTemplateArgument(*this, Template,
5186 TemplateLoc,
5187 RAngleLoc,
5188 TempParm,
5189 Converted,
5190 QualifierLoc);
5191 if (Name.isNull())
5192 return true;
5193
5194 Arg = TemplateArgumentLoc(TemplateArgument(Name), QualifierLoc,
5195 TempParm->getDefaultArgument().getTemplateNameLoc());
5196 }
5197
5198 // Introduce an instantiation record that describes where we are using
5199 // the default template argument. We're not actually instantiating a
5200 // template here, we just create this object to put a note into the
5201 // context stack.
5202 InstantiatingTemplate Inst(*this, RAngleLoc, Template, *Param, Converted,
5203 SourceRange(TemplateLoc, RAngleLoc));
5204 if (Inst.isInvalid())
5205 return true;
5206
5207 // Check the default template argument.
5208 if (CheckTemplateArgument(*Param, Arg, Template, TemplateLoc,
5209 RAngleLoc, 0, Converted))
5210 return true;
5211
5212 // Core issue 150 (assumed resolution): if this is a template template
5213 // parameter, keep track of the default template arguments from the
5214 // template definition.
5215 if (isTemplateTemplateParameter)
5216 NewArgs.addArgument(Arg);
5217
5218 // Move to the next template parameter and argument.
5219 ++Param;
5220 ++ArgIdx;
5221 }
5222
5223 // If we're performing a partial argument substitution, allow any trailing
5224 // pack expansions; they might be empty. This can happen even if
5225 // PartialTemplateArgs is false (the list of arguments is complete but
5226 // still dependent).
5227 if (ArgIdx < NumArgs && CurrentInstantiationScope &&
5228 CurrentInstantiationScope->getPartiallySubstitutedPack()) {
5229 while (ArgIdx < NumArgs && NewArgs[ArgIdx].getArgument().isPackExpansion())
5230 Converted.push_back(NewArgs[ArgIdx++].getArgument());
5231 }
5232
5233 // If we have any leftover arguments, then there were too many arguments.
5234 // Complain and fail.
5235 if (ArgIdx < NumArgs) {
5236 Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
5237 << /*too many args*/1
5238 << (int)getTemplateNameKindForDiagnostics(TemplateName(Template))
5239 << Template
5240 << SourceRange(NewArgs[ArgIdx].getLocation(), NewArgs.getRAngleLoc());
5241 Diag(Template->getLocation(), diag::note_template_decl_here)
5242 << Params->getSourceRange();
5243 return true;
5244 }
5245
5246 // No problems found with the new argument list, propagate changes back
5247 // to caller.
5248 if (UpdateArgsWithConversions)
5249 TemplateArgs = std::move(NewArgs);
5250
5251 return false;
5252}
5253
5254namespace {
5255 class UnnamedLocalNoLinkageFinder
5256 : public TypeVisitor<UnnamedLocalNoLinkageFinder, bool>
5257 {
5258 Sema &S;
5259 SourceRange SR;
5260
5261 typedef TypeVisitor<UnnamedLocalNoLinkageFinder, bool> inherited;
5262
5263 public:
5264 UnnamedLocalNoLinkageFinder(Sema &S, SourceRange SR) : S(S), SR(SR) { }
5265
5266 bool Visit(QualType T) {
5267 return T.isNull() ? false : inherited::Visit(T.getTypePtr());
5268 }
5269
5270#define TYPE(Class, Parent) \
5271 bool Visit##Class##Type(const Class##Type *);
5272#define ABSTRACT_TYPE(Class, Parent) \
5273 bool Visit##Class##Type(const Class##Type *) { return false; }
5274#define NON_CANONICAL_TYPE(Class, Parent) \
5275 bool Visit##Class##Type(const Class##Type *) { return false; }
5276#include "clang/AST/TypeNodes.def"
5277
5278 bool VisitTagDecl(const TagDecl *Tag);
5279 bool VisitNestedNameSpecifier(NestedNameSpecifier *NNS);
5280 };
5281} // end anonymous namespace
5282
5283bool UnnamedLocalNoLinkageFinder::VisitBuiltinType(const BuiltinType*) {
5284 return false;
5285}
5286
5287bool UnnamedLocalNoLinkageFinder::VisitComplexType(const ComplexType* T) {
5288 return Visit(T->getElementType());
5289}
5290
5291bool UnnamedLocalNoLinkageFinder::VisitPointerType(const PointerType* T) {
5292 return Visit(T->getPointeeType());
5293}
5294
5295bool UnnamedLocalNoLinkageFinder::VisitBlockPointerType(
5296 const BlockPointerType* T) {
5297 return Visit(T->getPointeeType());
5298}
5299
5300bool UnnamedLocalNoLinkageFinder::VisitLValueReferenceType(
5301 const LValueReferenceType* T) {
5302 return Visit(T->getPointeeType());
5303}
5304
5305bool UnnamedLocalNoLinkageFinder::VisitRValueReferenceType(
5306 const RValueReferenceType* T) {
5307 return Visit(T->getPointeeType());
5308}
5309
5310bool UnnamedLocalNoLinkageFinder::VisitMemberPointerType(
5311 const MemberPointerType* T) {
5312 return Visit(T->getPointeeType()) || Visit(QualType(T->getClass(), 0));
5313}
5314
5315bool UnnamedLocalNoLinkageFinder::VisitConstantArrayType(
5316 const ConstantArrayType* T) {
5317 return Visit(T->getElementType());
5318}
5319
5320bool UnnamedLocalNoLinkageFinder::VisitIncompleteArrayType(
5321 const IncompleteArrayType* T) {
5322 return Visit(T->getElementType());
5323}
5324
5325bool UnnamedLocalNoLinkageFinder::VisitVariableArrayType(
5326 const VariableArrayType* T) {
5327 return Visit(T->getElementType());
5328}
5329
5330bool UnnamedLocalNoLinkageFinder::VisitDependentSizedArrayType(
5331 const DependentSizedArrayType* T) {
5332 return Visit(T->getElementType());
5333}
5334
5335bool UnnamedLocalNoLinkageFinder::VisitDependentSizedExtVectorType(
5336 const DependentSizedExtVectorType* T) {
5337 return Visit(T->getElementType());
5338}
5339
5340bool UnnamedLocalNoLinkageFinder::VisitDependentAddressSpaceType(
5341 const DependentAddressSpaceType *T) {
5342 return Visit(T->getPointeeType());
5343}
5344
5345bool UnnamedLocalNoLinkageFinder::VisitVectorType(const VectorType* T) {
5346 return Visit(T->getElementType());
5347}
5348
5349bool UnnamedLocalNoLinkageFinder::VisitDependentVectorType(
5350 const DependentVectorType *T) {
5351 return Visit(T->getElementType());
5352}
5353
5354bool UnnamedLocalNoLinkageFinder::VisitExtVectorType(const ExtVectorType* T) {
5355 return Visit(T->getElementType());
5356}
5357
5358bool UnnamedLocalNoLinkageFinder::VisitFunctionProtoType(
5359 const FunctionProtoType* T) {
5360 for (const auto &A : T->param_types()) {
5361 if (Visit(A))
5362 return true;
5363 }
5364
5365 return Visit(T->getReturnType());
5366}
5367
5368bool UnnamedLocalNoLinkageFinder::VisitFunctionNoProtoType(
5369 const FunctionNoProtoType* T) {
5370 return Visit(T->getReturnType());
5371}
5372
5373bool UnnamedLocalNoLinkageFinder::VisitUnresolvedUsingType(
5374 const UnresolvedUsingType*) {
5375 return false;
5376}
5377
5378bool UnnamedLocalNoLinkageFinder::VisitTypeOfExprType(const TypeOfExprType*) {
5379 return false;
5380}
5381
5382bool UnnamedLocalNoLinkageFinder::VisitTypeOfType(const TypeOfType* T) {
5383 return Visit(T->getUnderlyingType());
5384}
5385
5386bool UnnamedLocalNoLinkageFinder::VisitDecltypeType(const DecltypeType*) {
5387 return false;
5388}
5389
5390bool UnnamedLocalNoLinkageFinder::VisitUnaryTransformType(
5391 const UnaryTransformType*) {
5392 return false;
5393}
5394
5395bool UnnamedLocalNoLinkageFinder::VisitAutoType(const AutoType *T) {
5396 return Visit(T->getDeducedType());
5397}
5398
5399bool UnnamedLocalNoLinkageFinder::VisitDeducedTemplateSpecializationType(
5400 const DeducedTemplateSpecializationType *T) {
5401 return Visit(T->getDeducedType());
5402}
5403
5404bool UnnamedLocalNoLinkageFinder::VisitRecordType(const RecordType* T) {
5405 return VisitTagDecl(T->getDecl());
5406}
5407
5408bool UnnamedLocalNoLinkageFinder::VisitEnumType(const EnumType* T) {
5409 return VisitTagDecl(T->getDecl());
5410}
5411
5412bool UnnamedLocalNoLinkageFinder::VisitTemplateTypeParmType(
5413 const TemplateTypeParmType*) {
5414 return false;
5415}
5416
5417bool UnnamedLocalNoLinkageFinder::VisitSubstTemplateTypeParmPackType(
5418 const SubstTemplateTypeParmPackType *) {
5419 return false;
5420}
5421
5422bool UnnamedLocalNoLinkageFinder::VisitTemplateSpecializationType(
5423 const TemplateSpecializationType*) {
5424 return false;
5425}
5426
5427bool UnnamedLocalNoLinkageFinder::VisitInjectedClassNameType(
5428 const InjectedClassNameType* T) {
5429 return VisitTagDecl(T->getDecl());
5430}
5431
5432bool UnnamedLocalNoLinkageFinder::VisitDependentNameType(
5433 const DependentNameType* T) {
5434 return VisitNestedNameSpecifier(T->getQualifier());
5435}
5436
5437bool UnnamedLocalNoLinkageFinder::VisitDependentTemplateSpecializationType(
5438 const DependentTemplateSpecializationType* T) {
5439 return VisitNestedNameSpecifier(T->getQualifier());
5440}
5441
5442bool UnnamedLocalNoLinkageFinder::VisitPackExpansionType(
5443 const PackExpansionType* T) {
5444 return Visit(T->getPattern());
5445}
5446
5447bool UnnamedLocalNoLinkageFinder::VisitObjCObjectType(const ObjCObjectType *) {
5448 return false;
5449}
5450
5451bool UnnamedLocalNoLinkageFinder::VisitObjCInterfaceType(
5452 const ObjCInterfaceType *) {
5453 return false;
5454}
5455
5456bool UnnamedLocalNoLinkageFinder::VisitObjCObjectPointerType(
5457 const ObjCObjectPointerType *) {
5458 return false;
5459}
5460
5461bool UnnamedLocalNoLinkageFinder::VisitAtomicType(const AtomicType* T) {
5462 return Visit(T->getValueType());
5463}
5464
5465bool UnnamedLocalNoLinkageFinder::VisitPipeType(const PipeType* T) {
5466 return false;
5467}
5468
5469bool UnnamedLocalNoLinkageFinder::VisitTagDecl(const TagDecl *Tag) {
5470 if (Tag->getDeclContext()->isFunctionOrMethod()) {
5471 S.Diag(SR.getBegin(),
5472 S.getLangOpts().CPlusPlus11 ?
5473 diag::warn_cxx98_compat_template_arg_local_type :
5474 diag::ext_template_arg_local_type)
5475 << S.Context.getTypeDeclType(Tag) << SR;
5476 return true;
5477 }
5478
5479 if (!Tag->hasNameForLinkage()) {
5480 S.Diag(SR.getBegin(),
5481 S.getLangOpts().CPlusPlus11 ?
5482 diag::warn_cxx98_compat_template_arg_unnamed_type :
5483 diag::ext_template_arg_unnamed_type) << SR;
5484 S.Diag(Tag->getLocation(), diag::note_template_unnamed_type_here);
5485 return true;
5486 }
5487
5488 return false;
5489}
5490
5491bool UnnamedLocalNoLinkageFinder::VisitNestedNameSpecifier(
5492 NestedNameSpecifier *NNS) {
5493 if (NNS->getPrefix() && VisitNestedNameSpecifier(NNS->getPrefix()))
5494 return true;
5495
5496 switch (NNS->getKind()) {
5497 case NestedNameSpecifier::Identifier:
5498 case NestedNameSpecifier::Namespace:
5499 case NestedNameSpecifier::NamespaceAlias:
5500 case NestedNameSpecifier::Global:
5501 case NestedNameSpecifier::Super:
5502 return false;
5503
5504 case NestedNameSpecifier::TypeSpec:
5505 case NestedNameSpecifier::TypeSpecWithTemplate:
5506 return Visit(QualType(NNS->getAsType(), 0));
5507 }
5508 llvm_unreachable("Invalid NestedNameSpecifier::Kind!")::llvm::llvm_unreachable_internal("Invalid NestedNameSpecifier::Kind!"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5508)
;
5509}
5510
5511/// Check a template argument against its corresponding
5512/// template type parameter.
5513///
5514/// This routine implements the semantics of C++ [temp.arg.type]. It
5515/// returns true if an error occurred, and false otherwise.
5516bool Sema::CheckTemplateArgument(TemplateTypeParmDecl *Param,
5517 TypeSourceInfo *ArgInfo) {
5518 assert(ArgInfo && "invalid TypeSourceInfo")(static_cast <bool> (ArgInfo && "invalid TypeSourceInfo"
) ? void (0) : __assert_fail ("ArgInfo && \"invalid TypeSourceInfo\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5518, __extension__ __PRETTY_FUNCTION__))
;
5519 QualType Arg = ArgInfo->getType();
5520 SourceRange SR = ArgInfo->getTypeLoc().getSourceRange();
5521
5522 if (Arg->isVariablyModifiedType()) {
5523 return Diag(SR.getBegin(), diag::err_variably_modified_template_arg) << Arg;
5524 } else if (Context.hasSameUnqualifiedType(Arg, Context.OverloadTy)) {
5525 return Diag(SR.getBegin(), diag::err_template_arg_overload_type) << SR;
5526 }
5527
5528 // C++03 [temp.arg.type]p2:
5529 // A local type, a type with no linkage, an unnamed type or a type
5530 // compounded from any of these types shall not be used as a
5531 // template-argument for a template type-parameter.
5532 //
5533 // C++11 allows these, and even in C++03 we allow them as an extension with
5534 // a warning.
5535 if (LangOpts.CPlusPlus11 || Arg->hasUnnamedOrLocalType()) {
5536 UnnamedLocalNoLinkageFinder Finder(*this, SR);
5537 (void)Finder.Visit(Context.getCanonicalType(Arg));
5538 }
5539
5540 return false;
5541}
5542
5543enum NullPointerValueKind {
5544 NPV_NotNullPointer,
5545 NPV_NullPointer,
5546 NPV_Error
5547};
5548
5549/// Determine whether the given template argument is a null pointer
5550/// value of the appropriate type.
5551static NullPointerValueKind
5552isNullPointerValueTemplateArgument(Sema &S, NonTypeTemplateParmDecl *Param,
5553 QualType ParamType, Expr *Arg,
5554 Decl *Entity = nullptr) {
5555 if (Arg->isValueDependent() || Arg->isTypeDependent())
5556 return NPV_NotNullPointer;
5557
5558 // dllimport'd entities aren't constant but are available inside of template
5559 // arguments.
5560 if (Entity && Entity->hasAttr<DLLImportAttr>())
5561 return NPV_NotNullPointer;
5562
5563 if (!S.isCompleteType(Arg->getExprLoc(), ParamType))
5564 llvm_unreachable(::llvm::llvm_unreachable_internal("Incomplete parameter type in isNullPointerValueTemplateArgument!"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5565)
5565 "Incomplete parameter type in isNullPointerValueTemplateArgument!")::llvm::llvm_unreachable_internal("Incomplete parameter type in isNullPointerValueTemplateArgument!"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5565)
;
5566
5567 if (!S.getLangOpts().CPlusPlus11)
5568 return NPV_NotNullPointer;
5569
5570 // Determine whether we have a constant expression.
5571 ExprResult ArgRV = S.DefaultFunctionArrayConversion(Arg);
5572 if (ArgRV.isInvalid())
5573 return NPV_Error;
5574 Arg = ArgRV.get();
5575
5576 Expr::EvalResult EvalResult;
5577 SmallVector<PartialDiagnosticAt, 8> Notes;
5578 EvalResult.Diag = &Notes;
5579 if (!Arg->EvaluateAsRValue(EvalResult, S.Context) ||
5580 EvalResult.HasSideEffects) {
5581 SourceLocation DiagLoc = Arg->getExprLoc();
5582
5583 // If our only note is the usual "invalid subexpression" note, just point
5584 // the caret at its location rather than producing an essentially
5585 // redundant note.
5586 if (Notes.size() == 1 && Notes[0].second.getDiagID() ==
5587 diag::note_invalid_subexpr_in_const_expr) {
5588 DiagLoc = Notes[0].first;
5589 Notes.clear();
5590 }
5591
5592 S.Diag(DiagLoc, diag::err_template_arg_not_address_constant)
5593 << Arg->getType() << Arg->getSourceRange();
5594 for (unsigned I = 0, N = Notes.size(); I != N; ++I)
5595 S.Diag(Notes[I].first, Notes[I].second);
5596
5597 S.Diag(Param->getLocation(), diag::note_template_param_here);
5598 return NPV_Error;
5599 }
5600
5601 // C++11 [temp.arg.nontype]p1:
5602 // - an address constant expression of type std::nullptr_t
5603 if (Arg->getType()->isNullPtrType())
5604 return NPV_NullPointer;
5605
5606 // - a constant expression that evaluates to a null pointer value (4.10); or
5607 // - a constant expression that evaluates to a null member pointer value
5608 // (4.11); or
5609 if ((EvalResult.Val.isLValue() && !EvalResult.Val.getLValueBase()) ||
5610 (EvalResult.Val.isMemberPointer() &&
5611 !EvalResult.Val.getMemberPointerDecl())) {
5612 // If our expression has an appropriate type, we've succeeded.
5613 bool ObjCLifetimeConversion;
5614 if (S.Context.hasSameUnqualifiedType(Arg->getType(), ParamType) ||
5615 S.IsQualificationConversion(Arg->getType(), ParamType, false,
5616 ObjCLifetimeConversion))
5617 return NPV_NullPointer;
5618
5619 // The types didn't match, but we know we got a null pointer; complain,
5620 // then recover as if the types were correct.
5621 S.Diag(Arg->getExprLoc(), diag::err_template_arg_wrongtype_null_constant)
5622 << Arg->getType() << ParamType << Arg->getSourceRange();
5623 S.Diag(Param->getLocation(), diag::note_template_param_here);
5624 return NPV_NullPointer;
5625 }
5626
5627 // If we don't have a null pointer value, but we do have a NULL pointer
5628 // constant, suggest a cast to the appropriate type.
5629 if (Arg->isNullPointerConstant(S.Context, Expr::NPC_NeverValueDependent)) {
5630 std::string Code = "static_cast<" + ParamType.getAsString() + ">(";
5631 S.Diag(Arg->getExprLoc(), diag::err_template_arg_untyped_null_constant)
5632 << ParamType << FixItHint::CreateInsertion(Arg->getLocStart(), Code)
5633 << FixItHint::CreateInsertion(S.getLocForEndOfToken(Arg->getLocEnd()),
5634 ")");
5635 S.Diag(Param->getLocation(), diag::note_template_param_here);
5636 return NPV_NullPointer;
5637 }
5638
5639 // FIXME: If we ever want to support general, address-constant expressions
5640 // as non-type template arguments, we should return the ExprResult here to
5641 // be interpreted by the caller.
5642 return NPV_NotNullPointer;
5643}
5644
5645/// Checks whether the given template argument is compatible with its
5646/// template parameter.
5647static bool CheckTemplateArgumentIsCompatibleWithParameter(
5648 Sema &S, NonTypeTemplateParmDecl *Param, QualType ParamType, Expr *ArgIn,
5649 Expr *Arg, QualType ArgType) {
5650 bool ObjCLifetimeConversion;
5651 if (ParamType->isPointerType() &&
5652 !ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType() &&
5653 S.IsQualificationConversion(ArgType, ParamType, false,
5654 ObjCLifetimeConversion)) {
5655 // For pointer-to-object types, qualification conversions are
5656 // permitted.
5657 } else {
5658 if (const ReferenceType *ParamRef = ParamType->getAs<ReferenceType>()) {
5659 if (!ParamRef->getPointeeType()->isFunctionType()) {
5660 // C++ [temp.arg.nontype]p5b3:
5661 // For a non-type template-parameter of type reference to
5662 // object, no conversions apply. The type referred to by the
5663 // reference may be more cv-qualified than the (otherwise
5664 // identical) type of the template- argument. The
5665 // template-parameter is bound directly to the
5666 // template-argument, which shall be an lvalue.
5667
5668 // FIXME: Other qualifiers?
5669 unsigned ParamQuals = ParamRef->getPointeeType().getCVRQualifiers();
5670 unsigned ArgQuals = ArgType.getCVRQualifiers();
5671
5672 if ((ParamQuals | ArgQuals) != ParamQuals) {
5673 S.Diag(Arg->getLocStart(),
5674 diag::err_template_arg_ref_bind_ignores_quals)
5675 << ParamType << Arg->getType() << Arg->getSourceRange();
5676 S.Diag(Param->getLocation(), diag::note_template_param_here);
5677 return true;
5678 }
5679 }
5680 }
5681
5682 // At this point, the template argument refers to an object or
5683 // function with external linkage. We now need to check whether the
5684 // argument and parameter types are compatible.
5685 if (!S.Context.hasSameUnqualifiedType(ArgType,
5686 ParamType.getNonReferenceType())) {
5687 // We can't perform this conversion or binding.
5688 if (ParamType->isReferenceType())
5689 S.Diag(Arg->getLocStart(), diag::err_template_arg_no_ref_bind)
5690 << ParamType << ArgIn->getType() << Arg->getSourceRange();
5691 else
5692 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_convertible)
5693 << ArgIn->getType() << ParamType << Arg->getSourceRange();
5694 S.Diag(Param->getLocation(), diag::note_template_param_here);
5695 return true;
5696 }
5697 }
5698
5699 return false;
5700}
5701
5702/// Checks whether the given template argument is the address
5703/// of an object or function according to C++ [temp.arg.nontype]p1.
5704static bool
5705CheckTemplateArgumentAddressOfObjectOrFunction(Sema &S,
5706 NonTypeTemplateParmDecl *Param,
5707 QualType ParamType,
5708 Expr *ArgIn,
5709 TemplateArgument &Converted) {
5710 bool Invalid = false;
5711 Expr *Arg = ArgIn;
5712 QualType ArgType = Arg->getType();
5713
5714 bool AddressTaken = false;
5715 SourceLocation AddrOpLoc;
5716 if (S.getLangOpts().MicrosoftExt) {
5717 // Microsoft Visual C++ strips all casts, allows an arbitrary number of
5718 // dereference and address-of operators.
5719 Arg = Arg->IgnoreParenCasts();
5720
5721 bool ExtWarnMSTemplateArg = false;
5722 UnaryOperatorKind FirstOpKind;
5723 SourceLocation FirstOpLoc;
5724 while (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
5725 UnaryOperatorKind UnOpKind = UnOp->getOpcode();
5726 if (UnOpKind == UO_Deref)
5727 ExtWarnMSTemplateArg = true;
5728 if (UnOpKind == UO_AddrOf || UnOpKind == UO_Deref) {
5729 Arg = UnOp->getSubExpr()->IgnoreParenCasts();
5730 if (!AddrOpLoc.isValid()) {
5731 FirstOpKind = UnOpKind;
5732 FirstOpLoc = UnOp->getOperatorLoc();
5733 }
5734 } else
5735 break;
5736 }
5737 if (FirstOpLoc.isValid()) {
5738 if (ExtWarnMSTemplateArg)
5739 S.Diag(ArgIn->getLocStart(), diag::ext_ms_deref_template_argument)
5740 << ArgIn->getSourceRange();
5741
5742 if (FirstOpKind == UO_AddrOf)
5743 AddressTaken = true;
5744 else if (Arg->getType()->isPointerType()) {
5745 // We cannot let pointers get dereferenced here, that is obviously not a
5746 // constant expression.
5747 assert(FirstOpKind == UO_Deref)(static_cast <bool> (FirstOpKind == UO_Deref) ? void (0
) : __assert_fail ("FirstOpKind == UO_Deref", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5747, __extension__ __PRETTY_FUNCTION__))
;
5748 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_decl_ref)
5749 << Arg->getSourceRange();
5750 }
5751 }
5752 } else {
5753 // See through any implicit casts we added to fix the type.
5754 Arg = Arg->IgnoreImpCasts();
5755
5756 // C++ [temp.arg.nontype]p1:
5757 //
5758 // A template-argument for a non-type, non-template
5759 // template-parameter shall be one of: [...]
5760 //
5761 // -- the address of an object or function with external
5762 // linkage, including function templates and function
5763 // template-ids but excluding non-static class members,
5764 // expressed as & id-expression where the & is optional if
5765 // the name refers to a function or array, or if the
5766 // corresponding template-parameter is a reference; or
5767
5768 // In C++98/03 mode, give an extension warning on any extra parentheses.
5769 // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773
5770 bool ExtraParens = false;
5771 while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) {
5772 if (!Invalid && !ExtraParens) {
5773 S.Diag(Arg->getLocStart(),
5774 S.getLangOpts().CPlusPlus11
5775 ? diag::warn_cxx98_compat_template_arg_extra_parens
5776 : diag::ext_template_arg_extra_parens)
5777 << Arg->getSourceRange();
5778 ExtraParens = true;
5779 }
5780
5781 Arg = Parens->getSubExpr();
5782 }
5783
5784 while (SubstNonTypeTemplateParmExpr *subst =
5785 dyn_cast<SubstNonTypeTemplateParmExpr>(Arg))
5786 Arg = subst->getReplacement()->IgnoreImpCasts();
5787
5788 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
5789 if (UnOp->getOpcode() == UO_AddrOf) {
5790 Arg = UnOp->getSubExpr();
5791 AddressTaken = true;
5792 AddrOpLoc = UnOp->getOperatorLoc();
5793 }
5794 }
5795
5796 while (SubstNonTypeTemplateParmExpr *subst =
5797 dyn_cast<SubstNonTypeTemplateParmExpr>(Arg))
5798 Arg = subst->getReplacement()->IgnoreImpCasts();
5799 }
5800
5801 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg);
5802 ValueDecl *Entity = DRE ? DRE->getDecl() : nullptr;
5803
5804 // If our parameter has pointer type, check for a null template value.
5805 if (ParamType->isPointerType() || ParamType->isNullPtrType()) {
5806 switch (isNullPointerValueTemplateArgument(S, Param, ParamType, ArgIn,
5807 Entity)) {
5808 case NPV_NullPointer:
5809 S.Diag(Arg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null);
5810 Converted = TemplateArgument(S.Context.getCanonicalType(ParamType),
5811 /*isNullPtr=*/true);
5812 return false;
5813
5814 case NPV_Error:
5815 return true;
5816
5817 case NPV_NotNullPointer:
5818 break;
5819 }
5820 }
5821
5822 // Stop checking the precise nature of the argument if it is value dependent,
5823 // it should be checked when instantiated.
5824 if (Arg->isValueDependent()) {
5825 Converted = TemplateArgument(ArgIn);
5826 return false;
5827 }
5828
5829 if (isa<CXXUuidofExpr>(Arg)) {
5830 if (CheckTemplateArgumentIsCompatibleWithParameter(S, Param, ParamType,
5831 ArgIn, Arg, ArgType))
5832 return true;
5833
5834 Converted = TemplateArgument(ArgIn);
5835 return false;
5836 }
5837
5838 if (!DRE) {
5839 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_decl_ref)
5840 << Arg->getSourceRange();
5841 S.Diag(Param->getLocation(), diag::note_template_param_here);
5842 return true;
5843 }
5844
5845 // Cannot refer to non-static data members
5846 if (isa<FieldDecl>(Entity) || isa<IndirectFieldDecl>(Entity)) {
5847 S.Diag(Arg->getLocStart(), diag::err_template_arg_field)
5848 << Entity << Arg->getSourceRange();
5849 S.Diag(Param->getLocation(), diag::note_template_param_here);
5850 return true;
5851 }
5852
5853 // Cannot refer to non-static member functions
5854 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Entity)) {
5855 if (!Method->isStatic()) {
5856 S.Diag(Arg->getLocStart(), diag::err_template_arg_method)
5857 << Method << Arg->getSourceRange();
5858 S.Diag(Param->getLocation(), diag::note_template_param_here);
5859 return true;
5860 }
5861 }
5862
5863 FunctionDecl *Func = dyn_cast<FunctionDecl>(Entity);
5864 VarDecl *Var = dyn_cast<VarDecl>(Entity);
5865
5866 // A non-type template argument must refer to an object or function.
5867 if (!Func && !Var) {
5868 // We found something, but we don't know specifically what it is.
5869 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_object_or_func)
5870 << Arg->getSourceRange();
5871 S.Diag(DRE->getDecl()->getLocation(), diag::note_template_arg_refers_here);
5872 return true;
5873 }
5874
5875 // Address / reference template args must have external linkage in C++98.
5876 if (Entity->getFormalLinkage() == InternalLinkage) {
5877 S.Diag(Arg->getLocStart(), S.getLangOpts().CPlusPlus11 ?
5878 diag::warn_cxx98_compat_template_arg_object_internal :
5879 diag::ext_template_arg_object_internal)
5880 << !Func << Entity << Arg->getSourceRange();
5881 S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object)
5882 << !Func;
5883 } else if (!Entity->hasLinkage()) {
5884 S.Diag(Arg->getLocStart(), diag::err_template_arg_object_no_linkage)
5885 << !Func << Entity << Arg->getSourceRange();
5886 S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object)
5887 << !Func;
5888 return true;
5889 }
5890
5891 if (Func) {
5892 // If the template parameter has pointer type, the function decays.
5893 if (ParamType->isPointerType() && !AddressTaken)
5894 ArgType = S.Context.getPointerType(Func->getType());
5895 else if (AddressTaken && ParamType->isReferenceType()) {
5896 // If we originally had an address-of operator, but the
5897 // parameter has reference type, complain and (if things look
5898 // like they will work) drop the address-of operator.
5899 if (!S.Context.hasSameUnqualifiedType(Func->getType(),
5900 ParamType.getNonReferenceType())) {
5901 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
5902 << ParamType;
5903 S.Diag(Param->getLocation(), diag::note_template_param_here);
5904 return true;
5905 }
5906
5907 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
5908 << ParamType
5909 << FixItHint::CreateRemoval(AddrOpLoc);
5910 S.Diag(Param->getLocation(), diag::note_template_param_here);
5911
5912 ArgType = Func->getType();
5913 }
5914 } else {
5915 // A value of reference type is not an object.
5916 if (Var->getType()->isReferenceType()) {
5917 S.Diag(Arg->getLocStart(),
5918 diag::err_template_arg_reference_var)
5919 << Var->getType() << Arg->getSourceRange();
5920 S.Diag(Param->getLocation(), diag::note_template_param_here);
5921 return true;
5922 }
5923
5924 // A template argument must have static storage duration.
5925 if (Var->getTLSKind()) {
5926 S.Diag(Arg->getLocStart(), diag::err_template_arg_thread_local)
5927 << Arg->getSourceRange();
5928 S.Diag(Var->getLocation(), diag::note_template_arg_refers_here);
5929 return true;
5930 }
5931
5932 // If the template parameter has pointer type, we must have taken
5933 // the address of this object.
5934 if (ParamType->isReferenceType()) {
5935 if (AddressTaken) {
5936 // If we originally had an address-of operator, but the
5937 // parameter has reference type, complain and (if things look
5938 // like they will work) drop the address-of operator.
5939 if (!S.Context.hasSameUnqualifiedType(Var->getType(),
5940 ParamType.getNonReferenceType())) {
5941 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
5942 << ParamType;
5943 S.Diag(Param->getLocation(), diag::note_template_param_here);
5944 return true;
5945 }
5946
5947 S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer)
5948 << ParamType
5949 << FixItHint::CreateRemoval(AddrOpLoc);
5950 S.Diag(Param->getLocation(), diag::note_template_param_here);
5951
5952 ArgType = Var->getType();
5953 }
5954 } else if (!AddressTaken && ParamType->isPointerType()) {
5955 if (Var->getType()->isArrayType()) {
5956 // Array-to-pointer decay.
5957 ArgType = S.Context.getArrayDecayedType(Var->getType());
5958 } else {
5959 // If the template parameter has pointer type but the address of
5960 // this object was not taken, complain and (possibly) recover by
5961 // taking the address of the entity.
5962 ArgType = S.Context.getPointerType(Var->getType());
5963 if (!S.Context.hasSameUnqualifiedType(ArgType, ParamType)) {
5964 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_address_of)
5965 << ParamType;
5966 S.Diag(Param->getLocation(), diag::note_template_param_here);
5967 return true;
5968 }
5969
5970 S.Diag(Arg->getLocStart(), diag::err_template_arg_not_address_of)
5971 << ParamType
5972 << FixItHint::CreateInsertion(Arg->getLocStart(), "&");
5973
5974 S.Diag(Param->getLocation(), diag::note_template_param_here);
5975 }
5976 }
5977 }
5978
5979 if (CheckTemplateArgumentIsCompatibleWithParameter(S, Param, ParamType, ArgIn,
5980 Arg, ArgType))
5981 return true;
5982
5983 // Create the template argument.
5984 Converted =
5985 TemplateArgument(cast<ValueDecl>(Entity->getCanonicalDecl()), ParamType);
5986 S.MarkAnyDeclReferenced(Arg->getLocStart(), Entity, false);
5987 return false;
5988}
5989
5990/// Checks whether the given template argument is a pointer to
5991/// member constant according to C++ [temp.arg.nontype]p1.
5992static bool CheckTemplateArgumentPointerToMember(Sema &S,
5993 NonTypeTemplateParmDecl *Param,
5994 QualType ParamType,
5995 Expr *&ResultArg,
5996 TemplateArgument &Converted) {
5997 bool Invalid = false;
5998
5999 Expr *Arg = ResultArg;
6000 bool ObjCLifetimeConversion;
6001
6002 // C++ [temp.arg.nontype]p1:
6003 //
6004 // A template-argument for a non-type, non-template
6005 // template-parameter shall be one of: [...]
6006 //
6007 // -- a pointer to member expressed as described in 5.3.1.
6008 DeclRefExpr *DRE = nullptr;
6009
6010 // In C++98/03 mode, give an extension warning on any extra parentheses.
6011 // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773
6012 bool ExtraParens = false;
6013 while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) {
6014 if (!Invalid && !ExtraParens) {
6015 S.Diag(Arg->getLocStart(),
6016 S.getLangOpts().CPlusPlus11 ?
6017 diag::warn_cxx98_compat_template_arg_extra_parens :
6018 diag::ext_template_arg_extra_parens)
6019 << Arg->getSourceRange();
6020 ExtraParens = true;
6021 }
6022
6023 Arg = Parens->getSubExpr();
6024 }
6025
6026 while (SubstNonTypeTemplateParmExpr *subst =
6027 dyn_cast<SubstNonTypeTemplateParmExpr>(Arg))
6028 Arg = subst->getReplacement()->IgnoreImpCasts();
6029
6030 // A pointer-to-member constant written &Class::member.
6031 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) {
6032 if (UnOp->getOpcode() == UO_AddrOf) {
6033 DRE = dyn_cast<DeclRefExpr>(UnOp->getSubExpr());
6034 if (DRE && !DRE->getQualifier())
6035 DRE = nullptr;
6036 }
6037 }
6038 // A constant of pointer-to-member type.
6039 else if ((DRE = dyn_cast<DeclRefExpr>(Arg))) {
6040 ValueDecl *VD = DRE->getDecl();
6041 if (VD->getType()->isMemberPointerType()) {
6042 if (isa<NonTypeTemplateParmDecl>(VD)) {
6043 if (Arg->isTypeDependent() || Arg->isValueDependent()) {
6044 Converted = TemplateArgument(Arg);
6045 } else {
6046 VD = cast<ValueDecl>(VD->getCanonicalDecl());