Bug Summary

File:tools/clang/lib/Sema/SemaTemplate.cpp
Warning:line 1949, column 5
Called C++ object pointer is null

Annotated Source Code

Press '?' to see keyboard shortcuts

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-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 -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mthread-model posix -mframe-pointer=none -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-10/lib/clang/10.0.0 -D CLANG_VENDOR="Debian " -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-10~svn374877/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-10~svn374877/tools/clang/include -I /build/llvm-toolchain-snapshot-10~svn374877/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-10~svn374877/build-llvm/include -I /build/llvm-toolchain-snapshot-10~svn374877/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-10/lib/clang/10.0.0/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-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-10~svn374877/build-llvm/tools/clang/lib/Sema -fdebug-prefix-map=/build/llvm-toolchain-snapshot-10~svn374877=. -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2019-10-15-233810-7101-1 -x c++ /build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp
1//===------- SemaTemplate.cpp - Semantic Analysis for C++ Templates -------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//===----------------------------------------------------------------------===//
7//
8// This file implements semantic analysis for C++ templates.
9//===----------------------------------------------------------------------===//
10
11#include "TreeTransform.h"
12#include "clang/AST/ASTConsumer.h"
13#include "clang/AST/ASTContext.h"
14#include "clang/AST/DeclFriend.h"
15#include "clang/AST/DeclTemplate.h"
16#include "clang/AST/Expr.h"
17#include "clang/AST/ExprCXX.h"
18#include "clang/AST/RecursiveASTVisitor.h"
19#include "clang/AST/TypeVisitor.h"
20#include "clang/Basic/Builtins.h"
21#include "clang/Basic/LangOptions.h"
22#include "clang/Basic/PartialDiagnostic.h"
23#include "clang/Basic/Stack.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.")((!FD && "Cannot collect constraints from function declaration yet."
) ? static_cast<void> (0) : __assert_fail ("!FD && \"Cannot collect constraints from function declaration yet.\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 64, __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.
71///
72/// Note that this may return an UnresolvedUsingValueDecl if AllowDependent
73/// is true. In all other cases it will return a TemplateDecl (or null).
74NamedDecl *Sema::getAsTemplateNameDecl(NamedDecl *D,
75 bool AllowFunctionTemplates,
76 bool AllowDependent) {
77 D = D->getUnderlyingDecl();
78
79 if (isa<TemplateDecl>(D)) {
80 if (!AllowFunctionTemplates && isa<FunctionTemplateDecl>(D))
81 return nullptr;
82
83 return D;
84 }
85
86 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) {
87 // C++ [temp.local]p1:
88 // Like normal (non-template) classes, class templates have an
89 // injected-class-name (Clause 9). The injected-class-name
90 // can be used with or without a template-argument-list. When
91 // it is used without a template-argument-list, it is
92 // equivalent to the injected-class-name followed by the
93 // template-parameters of the class template enclosed in
94 // <>. When it is used with a template-argument-list, it
95 // refers to the specified class template specialization,
96 // which could be the current specialization or another
97 // specialization.
98 if (Record->isInjectedClassName()) {
99 Record = cast<CXXRecordDecl>(Record->getDeclContext());
100 if (Record->getDescribedClassTemplate())
101 return Record->getDescribedClassTemplate();
102
103 if (ClassTemplateSpecializationDecl *Spec
104 = dyn_cast<ClassTemplateSpecializationDecl>(Record))
105 return Spec->getSpecializedTemplate();
106 }
107
108 return nullptr;
109 }
110
111 // 'using Dependent::foo;' can resolve to a template name.
112 // 'using typename Dependent::foo;' cannot (not even if 'foo' is an
113 // injected-class-name).
114 if (AllowDependent && isa<UnresolvedUsingValueDecl>(D))
115 return D;
116
117 return nullptr;
118}
119
120void Sema::FilterAcceptableTemplateNames(LookupResult &R,
121 bool AllowFunctionTemplates,
122 bool AllowDependent) {
123 LookupResult::Filter filter = R.makeFilter();
124 while (filter.hasNext()) {
125 NamedDecl *Orig = filter.next();
126 if (!getAsTemplateNameDecl(Orig, AllowFunctionTemplates, AllowDependent))
127 filter.erase();
128 }
129 filter.done();
130}
131
132bool Sema::hasAnyAcceptableTemplateNames(LookupResult &R,
133 bool AllowFunctionTemplates,
134 bool AllowDependent,
135 bool AllowNonTemplateFunctions) {
136 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) {
137 if (getAsTemplateNameDecl(*I, AllowFunctionTemplates, AllowDependent))
138 return true;
139 if (AllowNonTemplateFunctions &&
140 isa<FunctionDecl>((*I)->getUnderlyingDecl()))
141 return true;
142 }
143
144 return false;
145}
146
147TemplateNameKind Sema::isTemplateName(Scope *S,
148 CXXScopeSpec &SS,
149 bool hasTemplateKeyword,
150 const UnqualifiedId &Name,
151 ParsedType ObjectTypePtr,
152 bool EnteringContext,
153 TemplateTy &TemplateResult,
154 bool &MemberOfUnknownSpecialization) {
155 assert(getLangOpts().CPlusPlus && "No template names in C!")((getLangOpts().CPlusPlus && "No template names in C!"
) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"No template names in C!\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 155, __PRETTY_FUNCTION__))
;
156
157 DeclarationName TName;
158 MemberOfUnknownSpecialization = false;
159
160 switch (Name.getKind()) {
161 case UnqualifiedIdKind::IK_Identifier:
162 TName = DeclarationName(Name.Identifier);
163 break;
164
165 case UnqualifiedIdKind::IK_OperatorFunctionId:
166 TName = Context.DeclarationNames.getCXXOperatorName(
167 Name.OperatorFunctionId.Operator);
168 break;
169
170 case UnqualifiedIdKind::IK_LiteralOperatorId:
171 TName = Context.DeclarationNames.getCXXLiteralOperatorName(Name.Identifier);
172 break;
173
174 default:
175 return TNK_Non_template;
176 }
177
178 QualType ObjectType = ObjectTypePtr.get();
179
180 AssumedTemplateKind AssumedTemplate;
181 LookupResult R(*this, TName, Name.getBeginLoc(), LookupOrdinaryName);
182 if (LookupTemplateName(R, S, SS, ObjectType, EnteringContext,
183 MemberOfUnknownSpecialization, SourceLocation(),
184 &AssumedTemplate))
185 return TNK_Non_template;
186
187 if (AssumedTemplate != AssumedTemplateKind::None) {
188 TemplateResult = TemplateTy::make(Context.getAssumedTemplateName(TName));
189 // Let the parser know whether we found nothing or found functions; if we
190 // found nothing, we want to more carefully check whether this is actually
191 // a function template name versus some other kind of undeclared identifier.
192 return AssumedTemplate == AssumedTemplateKind::FoundNothing
193 ? TNK_Undeclared_template
194 : TNK_Function_template;
195 }
196
197 if (R.empty())
198 return TNK_Non_template;
199
200 NamedDecl *D = nullptr;
201 if (R.isAmbiguous()) {
202 // If we got an ambiguity involving a non-function template, treat this
203 // as a template name, and pick an arbitrary template for error recovery.
204 bool AnyFunctionTemplates = false;
205 for (NamedDecl *FoundD : R) {
206 if (NamedDecl *FoundTemplate = getAsTemplateNameDecl(FoundD)) {
207 if (isa<FunctionTemplateDecl>(FoundTemplate))
208 AnyFunctionTemplates = true;
209 else {
210 D = FoundTemplate;
211 break;
212 }
213 }
214 }
215
216 // If we didn't find any templates at all, this isn't a template name.
217 // Leave the ambiguity for a later lookup to diagnose.
218 if (!D && !AnyFunctionTemplates) {
219 R.suppressDiagnostics();
220 return TNK_Non_template;
221 }
222
223 // If the only templates were function templates, filter out the rest.
224 // We'll diagnose the ambiguity later.
225 if (!D)
226 FilterAcceptableTemplateNames(R);
227 }
228
229 // At this point, we have either picked a single template name declaration D
230 // or we have a non-empty set of results R containing either one template name
231 // declaration or a set of function templates.
232
233 TemplateName Template;
234 TemplateNameKind TemplateKind;
235
236 unsigned ResultCount = R.end() - R.begin();
237 if (!D && ResultCount > 1) {
238 // We assume that we'll preserve the qualifier from a function
239 // template name in other ways.
240 Template = Context.getOverloadedTemplateName(R.begin(), R.end());
241 TemplateKind = TNK_Function_template;
242
243 // We'll do this lookup again later.
244 R.suppressDiagnostics();
245 } else {
246 if (!D) {
247 D = getAsTemplateNameDecl(*R.begin());
248 assert(D && "unambiguous result is not a template name")((D && "unambiguous result is not a template name") ?
static_cast<void> (0) : __assert_fail ("D && \"unambiguous result is not a template name\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 248, __PRETTY_FUNCTION__))
;
249 }
250
251 if (isa<UnresolvedUsingValueDecl>(D)) {
252 // We don't yet know whether this is a template-name or not.
253 MemberOfUnknownSpecialization = true;
254 return TNK_Non_template;
255 }
256
257 TemplateDecl *TD = cast<TemplateDecl>(D);
258
259 if (SS.isSet() && !SS.isInvalid()) {
260 NestedNameSpecifier *Qualifier = SS.getScopeRep();
261 Template = Context.getQualifiedTemplateName(Qualifier,
262 hasTemplateKeyword, TD);
263 } else {
264 Template = TemplateName(TD);
265 }
266
267 if (isa<FunctionTemplateDecl>(TD)) {
268 TemplateKind = TNK_Function_template;
269
270 // We'll do this lookup again later.
271 R.suppressDiagnostics();
272 } else {
273 assert(isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) ||((isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl
>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl
>(TD) || isa<BuiltinTemplateDecl>(TD) || isa<ConceptDecl
>(TD)) ? static_cast<void> (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD) || isa<ConceptDecl>(TD)"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 275, __PRETTY_FUNCTION__))
274 isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) ||((isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl
>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl
>(TD) || isa<BuiltinTemplateDecl>(TD) || isa<ConceptDecl
>(TD)) ? static_cast<void> (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD) || isa<ConceptDecl>(TD)"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 275, __PRETTY_FUNCTION__))
275 isa<BuiltinTemplateDecl>(TD) || isa<ConceptDecl>(TD))((isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl
>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl
>(TD) || isa<BuiltinTemplateDecl>(TD) || isa<ConceptDecl
>(TD)) ? static_cast<void> (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD) || isa<ConceptDecl>(TD)"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 275, __PRETTY_FUNCTION__))
;
276 TemplateKind =
277 isa<VarTemplateDecl>(TD) ? TNK_Var_template :
278 isa<ConceptDecl>(TD) ? TNK_Concept_template :
279 TNK_Type_template;
280 }
281 }
282
283 TemplateResult = TemplateTy::make(Template);
284 return TemplateKind;
285}
286
287bool Sema::isDeductionGuideName(Scope *S, const IdentifierInfo &Name,
288 SourceLocation NameLoc,
289 ParsedTemplateTy *Template) {
290 CXXScopeSpec SS;
291 bool MemberOfUnknownSpecialization = false;
292
293 // We could use redeclaration lookup here, but we don't need to: the
294 // syntactic form of a deduction guide is enough to identify it even
295 // if we can't look up the template name at all.
296 LookupResult R(*this, DeclarationName(&Name), NameLoc, LookupOrdinaryName);
297 if (LookupTemplateName(R, S, SS, /*ObjectType*/ QualType(),
298 /*EnteringContext*/ false,
299 MemberOfUnknownSpecialization))
300 return false;
301
302 if (R.empty()) return false;
303 if (R.isAmbiguous()) {
304 // FIXME: Diagnose an ambiguity if we find at least one template.
305 R.suppressDiagnostics();
306 return false;
307 }
308
309 // We only treat template-names that name type templates as valid deduction
310 // guide names.
311 TemplateDecl *TD = R.getAsSingle<TemplateDecl>();
312 if (!TD || !getAsTypeTemplateDecl(TD))
313 return false;
314
315 if (Template)
316 *Template = TemplateTy::make(TemplateName(TD));
317 return true;
318}
319
320bool Sema::DiagnoseUnknownTemplateName(const IdentifierInfo &II,
321 SourceLocation IILoc,
322 Scope *S,
323 const CXXScopeSpec *SS,
324 TemplateTy &SuggestedTemplate,
325 TemplateNameKind &SuggestedKind) {
326 // We can't recover unless there's a dependent scope specifier preceding the
327 // template name.
328 // FIXME: Typo correction?
329 if (!SS || !SS->isSet() || !isDependentScopeSpecifier(*SS) ||
330 computeDeclContext(*SS))
331 return false;
332
333 // The code is missing a 'template' keyword prior to the dependent template
334 // name.
335 NestedNameSpecifier *Qualifier = (NestedNameSpecifier*)SS->getScopeRep();
336 Diag(IILoc, diag::err_template_kw_missing)
337 << Qualifier << II.getName()
338 << FixItHint::CreateInsertion(IILoc, "template ");
339 SuggestedTemplate
340 = TemplateTy::make(Context.getDependentTemplateName(Qualifier, &II));
341 SuggestedKind = TNK_Dependent_template_name;
342 return true;
343}
344
345bool Sema::LookupTemplateName(LookupResult &Found,
346 Scope *S, CXXScopeSpec &SS,
347 QualType ObjectType,
348 bool EnteringContext,
349 bool &MemberOfUnknownSpecialization,
350 SourceLocation TemplateKWLoc,
351 AssumedTemplateKind *ATK) {
352 if (ATK)
353 *ATK = AssumedTemplateKind::None;
354
355 Found.setTemplateNameLookup(true);
356
357 // Determine where to perform name lookup
358 MemberOfUnknownSpecialization = false;
359 DeclContext *LookupCtx = nullptr;
360 bool IsDependent = false;
361 if (!ObjectType.isNull()) {
362 // This nested-name-specifier occurs in a member access expression, e.g.,
363 // x->B::f, and we are looking into the type of the object.
364 assert(!SS.isSet() && "ObjectType and scope specifier cannot coexist")((!SS.isSet() && "ObjectType and scope specifier cannot coexist"
) ? static_cast<void> (0) : __assert_fail ("!SS.isSet() && \"ObjectType and scope specifier cannot coexist\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 364, __PRETTY_FUNCTION__))
;
365 LookupCtx = computeDeclContext(ObjectType);
366 IsDependent = !LookupCtx && ObjectType->isDependentType();
367 assert((IsDependent || !ObjectType->isIncompleteType() ||(((IsDependent || !ObjectType->isIncompleteType() || ObjectType
->castAs<TagType>()->isBeingDefined()) &&
"Caller should have completed object type") ? static_cast<
void> (0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 369, __PRETTY_FUNCTION__))
368 ObjectType->castAs<TagType>()->isBeingDefined()) &&(((IsDependent || !ObjectType->isIncompleteType() || ObjectType
->castAs<TagType>()->isBeingDefined()) &&
"Caller should have completed object type") ? static_cast<
void> (0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 369, __PRETTY_FUNCTION__))
369 "Caller should have completed object type")(((IsDependent || !ObjectType->isIncompleteType() || ObjectType
->castAs<TagType>()->isBeingDefined()) &&
"Caller should have completed object type") ? static_cast<
void> (0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 369, __PRETTY_FUNCTION__))
;
370
371 // Template names cannot appear inside an Objective-C class or object type
372 // or a vector type.
373 //
374 // FIXME: This is wrong. For example:
375 //
376 // template<typename T> using Vec = T __attribute__((ext_vector_type(4)));
377 // Vec<int> vi;
378 // vi.Vec<int>::~Vec<int>();
379 //
380 // ... should be accepted but we will not treat 'Vec' as a template name
381 // here. The right thing to do would be to check if the name is a valid
382 // vector component name, and look up a template name if not. And similarly
383 // for lookups into Objective-C class and object types, where the same
384 // problem can arise.
385 if (ObjectType->isObjCObjectOrInterfaceType() ||
386 ObjectType->isVectorType()) {
387 Found.clear();
388 return false;
389 }
390 } else if (SS.isSet()) {
391 // This nested-name-specifier occurs after another nested-name-specifier,
392 // so long into the context associated with the prior nested-name-specifier.
393 LookupCtx = computeDeclContext(SS, EnteringContext);
394 IsDependent = !LookupCtx;
395
396 // The declaration context must be complete.
397 if (LookupCtx && RequireCompleteDeclContext(SS, LookupCtx))
398 return true;
399 }
400
401 bool ObjectTypeSearchedInScope = false;
402 bool AllowFunctionTemplatesInLookup = true;
403 if (LookupCtx) {
404 // Perform "qualified" name lookup into the declaration context we
405 // computed, which is either the type of the base of a member access
406 // expression or the declaration context associated with a prior
407 // nested-name-specifier.
408 LookupQualifiedName(Found, LookupCtx);
409
410 // FIXME: The C++ standard does not clearly specify what happens in the
411 // case where the object type is dependent, and implementations vary. In
412 // Clang, we treat a name after a . or -> as a template-name if lookup
413 // finds a non-dependent member or member of the current instantiation that
414 // is a type template, or finds no such members and lookup in the context
415 // of the postfix-expression finds a type template. In the latter case, the
416 // name is nonetheless dependent, and we may resolve it to a member of an
417 // unknown specialization when we come to instantiate the template.
418 IsDependent |= Found.wasNotFoundInCurrentInstantiation();
419 }
420
421 if (!SS.isSet() && (ObjectType.isNull() || Found.empty())) {
422 // C++ [basic.lookup.classref]p1:
423 // In a class member access expression (5.2.5), if the . or -> token is
424 // immediately followed by an identifier followed by a <, the
425 // identifier must be looked up to determine whether the < is the
426 // beginning of a template argument list (14.2) or a less-than operator.
427 // The identifier is first looked up in the class of the object
428 // expression. If the identifier is not found, it is then looked up in
429 // the context of the entire postfix-expression and shall name a class
430 // template.
431 if (S)
432 LookupName(Found, S);
433
434 if (!ObjectType.isNull()) {
435 // FIXME: We should filter out all non-type templates here, particularly
436 // variable templates and concepts. But the exclusion of alias templates
437 // and template template parameters is a wording defect.
438 AllowFunctionTemplatesInLookup = false;
439 ObjectTypeSearchedInScope = true;
440 }
441
442 IsDependent |= Found.wasNotFoundInCurrentInstantiation();
443 }
444
445 if (Found.isAmbiguous())
446 return false;
447
448 if (ATK && !SS.isSet() && ObjectType.isNull() && TemplateKWLoc.isInvalid()) {
449 // C++2a [temp.names]p2:
450 // A name is also considered to refer to a template if it is an
451 // unqualified-id followed by a < and name lookup finds either one or more
452 // functions or finds nothing.
453 //
454 // To keep our behavior consistent, we apply the "finds nothing" part in
455 // all language modes, and diagnose the empty lookup in ActOnCallExpr if we
456 // successfully form a call to an undeclared template-id.
457 bool AllFunctions =
458 getLangOpts().CPlusPlus2a &&
459 std::all_of(Found.begin(), Found.end(), [](NamedDecl *ND) {
460 return isa<FunctionDecl>(ND->getUnderlyingDecl());
461 });
462 if (AllFunctions || (Found.empty() && !IsDependent)) {
463 // If lookup found any functions, or if this is a name that can only be
464 // used for a function, then strongly assume this is a function
465 // template-id.
466 *ATK = (Found.empty() && Found.getLookupName().isIdentifier())
467 ? AssumedTemplateKind::FoundNothing
468 : AssumedTemplateKind::FoundFunctions;
469 Found.clear();
470 return false;
471 }
472 }
473
474 if (Found.empty() && !IsDependent) {
475 // If we did not find any names, attempt to correct any typos.
476 DeclarationName Name = Found.getLookupName();
477 Found.clear();
478 // Simple filter callback that, for keywords, only accepts the C++ *_cast
479 DefaultFilterCCC FilterCCC{};
480 FilterCCC.WantTypeSpecifiers = false;
481 FilterCCC.WantExpressionKeywords = false;
482 FilterCCC.WantRemainingKeywords = false;
483 FilterCCC.WantCXXNamedCasts = true;
484 if (TypoCorrection Corrected =
485 CorrectTypo(Found.getLookupNameInfo(), Found.getLookupKind(), S,
486 &SS, FilterCCC, CTK_ErrorRecovery, LookupCtx)) {
487 if (auto *ND = Corrected.getFoundDecl())
488 Found.addDecl(ND);
489 FilterAcceptableTemplateNames(Found);
490 if (Found.isAmbiguous()) {
491 Found.clear();
492 } else if (!Found.empty()) {
493 Found.setLookupName(Corrected.getCorrection());
494 if (LookupCtx) {
495 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
496 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
497 Name.getAsString() == CorrectedStr;
498 diagnoseTypo(Corrected, PDiag(diag::err_no_member_template_suggest)
499 << Name << LookupCtx << DroppedSpecifier
500 << SS.getRange());
501 } else {
502 diagnoseTypo(Corrected, PDiag(diag::err_no_template_suggest) << Name);
503 }
504 }
505 }
506 }
507
508 NamedDecl *ExampleLookupResult =
509 Found.empty() ? nullptr : Found.getRepresentativeDecl();
510 FilterAcceptableTemplateNames(Found, AllowFunctionTemplatesInLookup);
511 if (Found.empty()) {
512 if (IsDependent) {
513 MemberOfUnknownSpecialization = true;
514 return false;
515 }
516
517 // If a 'template' keyword was used, a lookup that finds only non-template
518 // names is an error.
519 if (ExampleLookupResult && TemplateKWLoc.isValid()) {
520 Diag(Found.getNameLoc(), diag::err_template_kw_refers_to_non_template)
521 << Found.getLookupName() << SS.getRange();
522 Diag(ExampleLookupResult->getUnderlyingDecl()->getLocation(),
523 diag::note_template_kw_refers_to_non_template)
524 << Found.getLookupName();
525 return true;
526 }
527
528 return false;
529 }
530
531 if (S && !ObjectType.isNull() && !ObjectTypeSearchedInScope &&
532 !getLangOpts().CPlusPlus11) {
533 // C++03 [basic.lookup.classref]p1:
534 // [...] If the lookup in the class of the object expression finds a
535 // template, the name is also looked up in the context of the entire
536 // postfix-expression and [...]
537 //
538 // Note: C++11 does not perform this second lookup.
539 LookupResult FoundOuter(*this, Found.getLookupName(), Found.getNameLoc(),
540 LookupOrdinaryName);
541 FoundOuter.setTemplateNameLookup(true);
542 LookupName(FoundOuter, S);
543 // FIXME: We silently accept an ambiguous lookup here, in violation of
544 // [basic.lookup]/1.
545 FilterAcceptableTemplateNames(FoundOuter, /*AllowFunctionTemplates=*/false);
546
547 NamedDecl *OuterTemplate;
548 if (FoundOuter.empty()) {
549 // - if the name is not found, the name found in the class of the
550 // object expression is used, otherwise
551 } else if (FoundOuter.isAmbiguous() || !FoundOuter.isSingleResult() ||
552 !(OuterTemplate =
553 getAsTemplateNameDecl(FoundOuter.getFoundDecl()))) {
554 // - if the name is found in the context of the entire
555 // postfix-expression and does not name a class template, the name
556 // found in the class of the object expression is used, otherwise
557 FoundOuter.clear();
558 } else if (!Found.isSuppressingDiagnostics()) {
559 // - if the name found is a class template, it must refer to the same
560 // entity as the one found in the class of the object expression,
561 // otherwise the program is ill-formed.
562 if (!Found.isSingleResult() ||
563 getAsTemplateNameDecl(Found.getFoundDecl())->getCanonicalDecl() !=
564 OuterTemplate->getCanonicalDecl()) {
565 Diag(Found.getNameLoc(),
566 diag::ext_nested_name_member_ref_lookup_ambiguous)
567 << Found.getLookupName()
568 << ObjectType;
569 Diag(Found.getRepresentativeDecl()->getLocation(),
570 diag::note_ambig_member_ref_object_type)
571 << ObjectType;
572 Diag(FoundOuter.getFoundDecl()->getLocation(),
573 diag::note_ambig_member_ref_scope);
574
575 // Recover by taking the template that we found in the object
576 // expression's type.
577 }
578 }
579 }
580
581 return false;
582}
583
584void Sema::diagnoseExprIntendedAsTemplateName(Scope *S, ExprResult TemplateName,
585 SourceLocation Less,
586 SourceLocation Greater) {
587 if (TemplateName.isInvalid())
588 return;
589
590 DeclarationNameInfo NameInfo;
591 CXXScopeSpec SS;
592 LookupNameKind LookupKind;
593
594 DeclContext *LookupCtx = nullptr;
595 NamedDecl *Found = nullptr;
596 bool MissingTemplateKeyword = false;
597
598 // Figure out what name we looked up.
599 if (auto *DRE = dyn_cast<DeclRefExpr>(TemplateName.get())) {
600 NameInfo = DRE->getNameInfo();
601 SS.Adopt(DRE->getQualifierLoc());
602 LookupKind = LookupOrdinaryName;
603 Found = DRE->getFoundDecl();
604 } else if (auto *ME = dyn_cast<MemberExpr>(TemplateName.get())) {
605 NameInfo = ME->getMemberNameInfo();
606 SS.Adopt(ME->getQualifierLoc());
607 LookupKind = LookupMemberName;
608 LookupCtx = ME->getBase()->getType()->getAsCXXRecordDecl();
609 Found = ME->getMemberDecl();
610 } else if (auto *DSDRE =
611 dyn_cast<DependentScopeDeclRefExpr>(TemplateName.get())) {
612 NameInfo = DSDRE->getNameInfo();
613 SS.Adopt(DSDRE->getQualifierLoc());
614 MissingTemplateKeyword = true;
615 } else if (auto *DSME =
616 dyn_cast<CXXDependentScopeMemberExpr>(TemplateName.get())) {
617 NameInfo = DSME->getMemberNameInfo();
618 SS.Adopt(DSME->getQualifierLoc());
619 MissingTemplateKeyword = true;
620 } else {
621 llvm_unreachable("unexpected kind of potential template name")::llvm::llvm_unreachable_internal("unexpected kind of potential template name"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 621)
;
622 }
623
624 // If this is a dependent-scope lookup, diagnose that the 'template' keyword
625 // was missing.
626 if (MissingTemplateKeyword) {
627 Diag(NameInfo.getBeginLoc(), diag::err_template_kw_missing)
628 << "" << NameInfo.getName().getAsString() << SourceRange(Less, Greater);
629 return;
630 }
631
632 // Try to correct the name by looking for templates and C++ named casts.
633 struct TemplateCandidateFilter : CorrectionCandidateCallback {
634 Sema &S;
635 TemplateCandidateFilter(Sema &S) : S(S) {
636 WantTypeSpecifiers = false;
637 WantExpressionKeywords = false;
638 WantRemainingKeywords = false;
639 WantCXXNamedCasts = true;
640 };
641 bool ValidateCandidate(const TypoCorrection &Candidate) override {
642 if (auto *ND = Candidate.getCorrectionDecl())
643 return S.getAsTemplateNameDecl(ND);
644 return Candidate.isKeyword();
645 }
646
647 std::unique_ptr<CorrectionCandidateCallback> clone() override {
648 return std::make_unique<TemplateCandidateFilter>(*this);
649 }
650 };
651
652 DeclarationName Name = NameInfo.getName();
653 TemplateCandidateFilter CCC(*this);
654 if (TypoCorrection Corrected = CorrectTypo(NameInfo, LookupKind, S, &SS, CCC,
655 CTK_ErrorRecovery, LookupCtx)) {
656 auto *ND = Corrected.getFoundDecl();
657 if (ND)
658 ND = getAsTemplateNameDecl(ND);
659 if (ND || Corrected.isKeyword()) {
660 if (LookupCtx) {
661 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
662 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
663 Name.getAsString() == CorrectedStr;
664 diagnoseTypo(Corrected,
665 PDiag(diag::err_non_template_in_member_template_id_suggest)
666 << Name << LookupCtx << DroppedSpecifier
667 << SS.getRange(), false);
668 } else {
669 diagnoseTypo(Corrected,
670 PDiag(diag::err_non_template_in_template_id_suggest)
671 << Name, false);
672 }
673 if (Found)
674 Diag(Found->getLocation(),
675 diag::note_non_template_in_template_id_found);
676 return;
677 }
678 }
679
680 Diag(NameInfo.getLoc(), diag::err_non_template_in_template_id)
681 << Name << SourceRange(Less, Greater);
682 if (Found)
683 Diag(Found->getLocation(), diag::note_non_template_in_template_id_found);
684}
685
686/// ActOnDependentIdExpression - Handle a dependent id-expression that
687/// was just parsed. This is only possible with an explicit scope
688/// specifier naming a dependent type.
689ExprResult
690Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS,
691 SourceLocation TemplateKWLoc,
692 const DeclarationNameInfo &NameInfo,
693 bool isAddressOfOperand,
694 const TemplateArgumentListInfo *TemplateArgs) {
695 DeclContext *DC = getFunctionLevelDeclContext();
696
697 // C++11 [expr.prim.general]p12:
698 // An id-expression that denotes a non-static data member or non-static
699 // member function of a class can only be used:
700 // (...)
701 // - if that id-expression denotes a non-static data member and it
702 // appears in an unevaluated operand.
703 //
704 // If this might be the case, form a DependentScopeDeclRefExpr instead of a
705 // CXXDependentScopeMemberExpr. The former can instantiate to either
706 // DeclRefExpr or MemberExpr depending on lookup results, while the latter is
707 // always a MemberExpr.
708 bool MightBeCxx11UnevalField =
709 getLangOpts().CPlusPlus11 && isUnevaluatedContext();
710
711 // Check if the nested name specifier is an enum type.
712 bool IsEnum = false;
713 if (NestedNameSpecifier *NNS = SS.getScopeRep())
714 IsEnum = dyn_cast_or_null<EnumType>(NNS->getAsType());
715
716 if (!MightBeCxx11UnevalField && !isAddressOfOperand && !IsEnum &&
717 isa<CXXMethodDecl>(DC) && cast<CXXMethodDecl>(DC)->isInstance()) {
718 QualType ThisType = cast<CXXMethodDecl>(DC)->getThisType();
719
720 // Since the 'this' expression is synthesized, we don't need to
721 // perform the double-lookup check.
722 NamedDecl *FirstQualifierInScope = nullptr;
723
724 return CXXDependentScopeMemberExpr::Create(
725 Context, /*This*/ nullptr, ThisType, /*IsArrow*/ true,
726 /*Op*/ SourceLocation(), SS.getWithLocInContext(Context), TemplateKWLoc,
727 FirstQualifierInScope, NameInfo, TemplateArgs);
728 }
729
730 return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs);
731}
732
733ExprResult
734Sema::BuildDependentDeclRefExpr(const CXXScopeSpec &SS,
735 SourceLocation TemplateKWLoc,
736 const DeclarationNameInfo &NameInfo,
737 const TemplateArgumentListInfo *TemplateArgs) {
738 // DependentScopeDeclRefExpr::Create requires a valid QualifierLoc
739 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
740 if (!QualifierLoc)
741 return ExprError();
742
743 return DependentScopeDeclRefExpr::Create(
744 Context, QualifierLoc, TemplateKWLoc, NameInfo, TemplateArgs);
745}
746
747
748/// Determine whether we would be unable to instantiate this template (because
749/// it either has no definition, or is in the process of being instantiated).
750bool Sema::DiagnoseUninstantiableTemplate(SourceLocation PointOfInstantiation,
751 NamedDecl *Instantiation,
752 bool InstantiatedFromMember,
753 const NamedDecl *Pattern,
754 const NamedDecl *PatternDef,
755 TemplateSpecializationKind TSK,
756 bool Complain /*= true*/) {
757 assert(isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) ||((isa<TagDecl>(Instantiation) || isa<FunctionDecl>
(Instantiation) || isa<VarDecl>(Instantiation)) ? static_cast
<void> (0) : __assert_fail ("isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) || isa<VarDecl>(Instantiation)"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 758, __PRETTY_FUNCTION__))
758 isa<VarDecl>(Instantiation))((isa<TagDecl>(Instantiation) || isa<FunctionDecl>
(Instantiation) || isa<VarDecl>(Instantiation)) ? static_cast
<void> (0) : __assert_fail ("isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) || isa<VarDecl>(Instantiation)"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 758, __PRETTY_FUNCTION__))
;
759
760 bool IsEntityBeingDefined = false;
761 if (const TagDecl *TD = dyn_cast_or_null<TagDecl>(PatternDef))
762 IsEntityBeingDefined = TD->isBeingDefined();
763
764 if (PatternDef && !IsEntityBeingDefined) {
765 NamedDecl *SuggestedDef = nullptr;
766 if (!hasVisibleDefinition(const_cast<NamedDecl*>(PatternDef), &SuggestedDef,
767 /*OnlyNeedComplete*/false)) {
768 // If we're allowed to diagnose this and recover, do so.
769 bool Recover = Complain && !isSFINAEContext();
770 if (Complain)
771 diagnoseMissingImport(PointOfInstantiation, SuggestedDef,
772 Sema::MissingImportKind::Definition, Recover);
773 return !Recover;
774 }
775 return false;
776 }
777
778 if (!Complain || (PatternDef && PatternDef->isInvalidDecl()))
779 return true;
780
781 llvm::Optional<unsigned> Note;
782 QualType InstantiationTy;
783 if (TagDecl *TD = dyn_cast<TagDecl>(Instantiation))
784 InstantiationTy = Context.getTypeDeclType(TD);
785 if (PatternDef) {
786 Diag(PointOfInstantiation,
787 diag::err_template_instantiate_within_definition)
788 << /*implicit|explicit*/(TSK != TSK_ImplicitInstantiation)
789 << InstantiationTy;
790 // Not much point in noting the template declaration here, since
791 // we're lexically inside it.
792 Instantiation->setInvalidDecl();
793 } else if (InstantiatedFromMember) {
794 if (isa<FunctionDecl>(Instantiation)) {
795 Diag(PointOfInstantiation,
796 diag::err_explicit_instantiation_undefined_member)
797 << /*member function*/ 1 << Instantiation->getDeclName()
798 << Instantiation->getDeclContext();
799 Note = diag::note_explicit_instantiation_here;
800 } else {
801 assert(isa<TagDecl>(Instantiation) && "Must be a TagDecl!")((isa<TagDecl>(Instantiation) && "Must be a TagDecl!"
) ? static_cast<void> (0) : __assert_fail ("isa<TagDecl>(Instantiation) && \"Must be a TagDecl!\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 801, __PRETTY_FUNCTION__))
;
802 Diag(PointOfInstantiation,
803 diag::err_implicit_instantiate_member_undefined)
804 << InstantiationTy;
805 Note = diag::note_member_declared_at;
806 }
807 } else {
808 if (isa<FunctionDecl>(Instantiation)) {
809 Diag(PointOfInstantiation,
810 diag::err_explicit_instantiation_undefined_func_template)
811 << Pattern;
812 Note = diag::note_explicit_instantiation_here;
813 } else if (isa<TagDecl>(Instantiation)) {
814 Diag(PointOfInstantiation, diag::err_template_instantiate_undefined)
815 << (TSK != TSK_ImplicitInstantiation)
816 << InstantiationTy;
817 Note = diag::note_template_decl_here;
818 } else {
819 assert(isa<VarDecl>(Instantiation) && "Must be a VarDecl!")((isa<VarDecl>(Instantiation) && "Must be a VarDecl!"
) ? static_cast<void> (0) : __assert_fail ("isa<VarDecl>(Instantiation) && \"Must be a VarDecl!\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 819, __PRETTY_FUNCTION__))
;
820 if (isa<VarTemplateSpecializationDecl>(Instantiation)) {
821 Diag(PointOfInstantiation,
822 diag::err_explicit_instantiation_undefined_var_template)
823 << Instantiation;
824 Instantiation->setInvalidDecl();
825 } else
826 Diag(PointOfInstantiation,
827 diag::err_explicit_instantiation_undefined_member)
828 << /*static data member*/ 2 << Instantiation->getDeclName()
829 << Instantiation->getDeclContext();
830 Note = diag::note_explicit_instantiation_here;
831 }
832 }
833 if (Note) // Diagnostics were emitted.
834 Diag(Pattern->getLocation(), Note.getValue());
835
836 // In general, Instantiation isn't marked invalid to get more than one
837 // error for multiple undefined instantiations. But the code that does
838 // explicit declaration -> explicit definition conversion can't handle
839 // invalid declarations, so mark as invalid in that case.
840 if (TSK == TSK_ExplicitInstantiationDeclaration)
841 Instantiation->setInvalidDecl();
842 return true;
843}
844
845/// DiagnoseTemplateParameterShadow - Produce a diagnostic complaining
846/// that the template parameter 'PrevDecl' is being shadowed by a new
847/// declaration at location Loc. Returns true to indicate that this is
848/// an error, and false otherwise.
849void Sema::DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl) {
850 assert(PrevDecl->isTemplateParameter() && "Not a template parameter")((PrevDecl->isTemplateParameter() && "Not a template parameter"
) ? static_cast<void> (0) : __assert_fail ("PrevDecl->isTemplateParameter() && \"Not a template parameter\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 850, __PRETTY_FUNCTION__))
;
851
852 // C++ [temp.local]p4:
853 // A template-parameter shall not be redeclared within its
854 // scope (including nested scopes).
855 //
856 // Make this a warning when MSVC compatibility is requested.
857 unsigned DiagId = getLangOpts().MSVCCompat ? diag::ext_template_param_shadow
858 : diag::err_template_param_shadow;
859 Diag(Loc, DiagId) << cast<NamedDecl>(PrevDecl)->getDeclName();
860 Diag(PrevDecl->getLocation(), diag::note_template_param_here);
861}
862
863/// AdjustDeclIfTemplate - If the given decl happens to be a template, reset
864/// the parameter D to reference the templated declaration and return a pointer
865/// to the template declaration. Otherwise, do nothing to D and return null.
866TemplateDecl *Sema::AdjustDeclIfTemplate(Decl *&D) {
867 if (TemplateDecl *Temp = dyn_cast_or_null<TemplateDecl>(D)) {
868 D = Temp->getTemplatedDecl();
869 return Temp;
870 }
871 return nullptr;
872}
873
874ParsedTemplateArgument ParsedTemplateArgument::getTemplatePackExpansion(
875 SourceLocation EllipsisLoc) const {
876 assert(Kind == Template &&((Kind == Template && "Only template template arguments can be pack expansions here"
) ? static_cast<void> (0) : __assert_fail ("Kind == Template && \"Only template template arguments can be pack expansions here\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 877, __PRETTY_FUNCTION__))
877 "Only template template arguments can be pack expansions here")((Kind == Template && "Only template template arguments can be pack expansions here"
) ? static_cast<void> (0) : __assert_fail ("Kind == Template && \"Only template template arguments can be pack expansions here\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 877, __PRETTY_FUNCTION__))
;
878 assert(getAsTemplate().get().containsUnexpandedParameterPack() &&((getAsTemplate().get().containsUnexpandedParameterPack() &&
"Template template argument pack expansion without packs") ?
static_cast<void> (0) : __assert_fail ("getAsTemplate().get().containsUnexpandedParameterPack() && \"Template template argument pack expansion without packs\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 879, __PRETTY_FUNCTION__))
879 "Template template argument pack expansion without packs")((getAsTemplate().get().containsUnexpandedParameterPack() &&
"Template template argument pack expansion without packs") ?
static_cast<void> (0) : __assert_fail ("getAsTemplate().get().containsUnexpandedParameterPack() && \"Template template argument pack expansion without packs\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 879, __PRETTY_FUNCTION__))
;
880 ParsedTemplateArgument Result(*this);
881 Result.EllipsisLoc = EllipsisLoc;
882 return Result;
883}
884
885static TemplateArgumentLoc translateTemplateArgument(Sema &SemaRef,
886 const ParsedTemplateArgument &Arg) {
887
888 switch (Arg.getKind()) {
889 case ParsedTemplateArgument::Type: {
890 TypeSourceInfo *DI;
891 QualType T = SemaRef.GetTypeFromParser(Arg.getAsType(), &DI);
892 if (!DI)
893 DI = SemaRef.Context.getTrivialTypeSourceInfo(T, Arg.getLocation());
894 return TemplateArgumentLoc(TemplateArgument(T), DI);
895 }
896
897 case ParsedTemplateArgument::NonType: {
898 Expr *E = static_cast<Expr *>(Arg.getAsExpr());
899 return TemplateArgumentLoc(TemplateArgument(E), E);
900 }
901
902 case ParsedTemplateArgument::Template: {
903 TemplateName Template = Arg.getAsTemplate().get();
904 TemplateArgument TArg;
905 if (Arg.getEllipsisLoc().isValid())
906 TArg = TemplateArgument(Template, Optional<unsigned int>());
907 else
908 TArg = Template;
909 return TemplateArgumentLoc(TArg,
910 Arg.getScopeSpec().getWithLocInContext(
911 SemaRef.Context),
912 Arg.getLocation(),
913 Arg.getEllipsisLoc());
914 }
915 }
916
917 llvm_unreachable("Unhandled parsed template argument")::llvm::llvm_unreachable_internal("Unhandled parsed template argument"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 917)
;
918}
919
920/// Translates template arguments as provided by the parser
921/// into template arguments used by semantic analysis.
922void Sema::translateTemplateArguments(const ASTTemplateArgsPtr &TemplateArgsIn,
923 TemplateArgumentListInfo &TemplateArgs) {
924 for (unsigned I = 0, Last = TemplateArgsIn.size(); I != Last; ++I)
925 TemplateArgs.addArgument(translateTemplateArgument(*this,
926 TemplateArgsIn[I]));
927}
928
929static void maybeDiagnoseTemplateParameterShadow(Sema &SemaRef, Scope *S,
930 SourceLocation Loc,
931 IdentifierInfo *Name) {
932 NamedDecl *PrevDecl = SemaRef.LookupSingleName(
933 S, Name, Loc, Sema::LookupOrdinaryName, Sema::ForVisibleRedeclaration);
934 if (PrevDecl && PrevDecl->isTemplateParameter())
935 SemaRef.DiagnoseTemplateParameterShadow(Loc, PrevDecl);
936}
937
938/// Convert a parsed type into a parsed template argument. This is mostly
939/// trivial, except that we may have parsed a C++17 deduced class template
940/// specialization type, in which case we should form a template template
941/// argument instead of a type template argument.
942ParsedTemplateArgument Sema::ActOnTemplateTypeArgument(TypeResult ParsedType) {
943 TypeSourceInfo *TInfo;
944 QualType T = GetTypeFromParser(ParsedType.get(), &TInfo);
945 if (T.isNull())
946 return ParsedTemplateArgument();
947 assert(TInfo && "template argument with no location")((TInfo && "template argument with no location") ? static_cast
<void> (0) : __assert_fail ("TInfo && \"template argument with no location\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 947, __PRETTY_FUNCTION__))
;
948
949 // If we might have formed a deduced template specialization type, convert
950 // it to a template template argument.
951 if (getLangOpts().CPlusPlus17) {
952 TypeLoc TL = TInfo->getTypeLoc();
953 SourceLocation EllipsisLoc;
954 if (auto PET = TL.getAs<PackExpansionTypeLoc>()) {
955 EllipsisLoc = PET.getEllipsisLoc();
956 TL = PET.getPatternLoc();
957 }
958
959 CXXScopeSpec SS;
960 if (auto ET = TL.getAs<ElaboratedTypeLoc>()) {
961 SS.Adopt(ET.getQualifierLoc());
962 TL = ET.getNamedTypeLoc();
963 }
964
965 if (auto DTST = TL.getAs<DeducedTemplateSpecializationTypeLoc>()) {
966 TemplateName Name = DTST.getTypePtr()->getTemplateName();
967 if (SS.isSet())
968 Name = Context.getQualifiedTemplateName(SS.getScopeRep(),
969 /*HasTemplateKeyword*/ false,
970 Name.getAsTemplateDecl());
971 ParsedTemplateArgument Result(SS, TemplateTy::make(Name),
972 DTST.getTemplateNameLoc());
973 if (EllipsisLoc.isValid())
974 Result = Result.getTemplatePackExpansion(EllipsisLoc);
975 return Result;
976 }
977 }
978
979 // This is a normal type template argument. Note, if the type template
980 // argument is an injected-class-name for a template, it has a dual nature
981 // and can be used as either a type or a template. We handle that in
982 // convertTypeTemplateArgumentToTemplate.
983 return ParsedTemplateArgument(ParsedTemplateArgument::Type,
984 ParsedType.get().getAsOpaquePtr(),
985 TInfo->getTypeLoc().getBeginLoc());
986}
987
988/// ActOnTypeParameter - Called when a C++ template type parameter
989/// (e.g., "typename T") has been parsed. Typename specifies whether
990/// the keyword "typename" was used to declare the type parameter
991/// (otherwise, "class" was used), and KeyLoc is the location of the
992/// "class" or "typename" keyword. ParamName is the name of the
993/// parameter (NULL indicates an unnamed template parameter) and
994/// ParamNameLoc is the location of the parameter name (if any).
995/// If the type parameter has a default argument, it will be added
996/// later via ActOnTypeParameterDefault.
997NamedDecl *Sema::ActOnTypeParameter(Scope *S, bool Typename,
998 SourceLocation EllipsisLoc,
999 SourceLocation KeyLoc,
1000 IdentifierInfo *ParamName,
1001 SourceLocation ParamNameLoc,
1002 unsigned Depth, unsigned Position,
1003 SourceLocation EqualLoc,
1004 ParsedType DefaultArg) {
1005 assert(S->isTemplateParamScope() &&((S->isTemplateParamScope() && "Template type parameter not in template parameter scope!"
) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Template type parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1006, __PRETTY_FUNCTION__))
1006 "Template type parameter not in template parameter scope!")((S->isTemplateParamScope() && "Template type parameter not in template parameter scope!"
) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Template type parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1006, __PRETTY_FUNCTION__))
;
1007
1008 bool IsParameterPack = EllipsisLoc.isValid();
1009 TemplateTypeParmDecl *Param = TemplateTypeParmDecl::Create(
1010 Context, Context.getTranslationUnitDecl(), KeyLoc, ParamNameLoc, Depth,
1011 Position, ParamName, Typename, IsParameterPack);
1012 Param->setAccess(AS_public);
1013
1014 if (Param->isParameterPack())
1015 if (auto *LSI = getEnclosingLambda())
1016 LSI->LocalPacks.push_back(Param);
1017
1018 if (ParamName) {
1019 maybeDiagnoseTemplateParameterShadow(*this, S, ParamNameLoc, ParamName);
1020
1021 // Add the template parameter into the current scope.
1022 S->AddDecl(Param);
1023 IdResolver.AddDecl(Param);
1024 }
1025
1026 // C++0x [temp.param]p9:
1027 // A default template-argument may be specified for any kind of
1028 // template-parameter that is not a template parameter pack.
1029 if (DefaultArg && IsParameterPack) {
1030 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
1031 DefaultArg = nullptr;
1032 }
1033
1034 // Handle the default argument, if provided.
1035 if (DefaultArg) {
1036 TypeSourceInfo *DefaultTInfo;
1037 GetTypeFromParser(DefaultArg, &DefaultTInfo);
1038
1039 assert(DefaultTInfo && "expected source information for type")((DefaultTInfo && "expected source information for type"
) ? static_cast<void> (0) : __assert_fail ("DefaultTInfo && \"expected source information for type\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1039, __PRETTY_FUNCTION__))
;
1040
1041 // Check for unexpanded parameter packs.
1042 if (DiagnoseUnexpandedParameterPack(ParamNameLoc, DefaultTInfo,
1043 UPPC_DefaultArgument))
1044 return Param;
1045
1046 // Check the template argument itself.
1047 if (CheckTemplateArgument(Param, DefaultTInfo)) {
1048 Param->setInvalidDecl();
1049 return Param;
1050 }
1051
1052 Param->setDefaultArgument(DefaultTInfo);
1053 }
1054
1055 return Param;
1056}
1057
1058/// Check that the type of a non-type template parameter is
1059/// well-formed.
1060///
1061/// \returns the (possibly-promoted) parameter type if valid;
1062/// otherwise, produces a diagnostic and returns a NULL type.
1063QualType Sema::CheckNonTypeTemplateParameterType(TypeSourceInfo *&TSI,
1064 SourceLocation Loc) {
1065 if (TSI->getType()->isUndeducedType()) {
1066 // C++17 [temp.dep.expr]p3:
1067 // An id-expression is type-dependent if it contains
1068 // - an identifier associated by name lookup with a non-type
1069 // template-parameter declared with a type that contains a
1070 // placeholder type (7.1.7.4),
1071 TSI = SubstAutoTypeSourceInfo(TSI, Context.DependentTy);
1072 }
1073
1074 return CheckNonTypeTemplateParameterType(TSI->getType(), Loc);
1075}
1076
1077QualType Sema::CheckNonTypeTemplateParameterType(QualType T,
1078 SourceLocation Loc) {
1079 // We don't allow variably-modified types as the type of non-type template
1080 // parameters.
1081 if (T->isVariablyModifiedType()) {
1082 Diag(Loc, diag::err_variably_modified_nontype_template_param)
1083 << T;
1084 return QualType();
1085 }
1086
1087 // C++ [temp.param]p4:
1088 //
1089 // A non-type template-parameter shall have one of the following
1090 // (optionally cv-qualified) types:
1091 //
1092 // -- integral or enumeration type,
1093 if (T->isIntegralOrEnumerationType() ||
1094 // -- pointer to object or pointer to function,
1095 T->isPointerType() ||
1096 // -- reference to object or reference to function,
1097 T->isReferenceType() ||
1098 // -- pointer to member,
1099 T->isMemberPointerType() ||
1100 // -- std::nullptr_t.
1101 T->isNullPtrType() ||
1102 // Allow use of auto in template parameter declarations.
1103 T->isUndeducedType()) {
1104 // C++ [temp.param]p5: The top-level cv-qualifiers on the template-parameter
1105 // are ignored when determining its type.
1106 return T.getUnqualifiedType();
1107 }
1108
1109 // C++ [temp.param]p8:
1110 //
1111 // A non-type template-parameter of type "array of T" or
1112 // "function returning T" is adjusted to be of type "pointer to
1113 // T" or "pointer to function returning T", respectively.
1114 if (T->isArrayType() || T->isFunctionType())
1115 return Context.getDecayedType(T);
1116
1117 // If T is a dependent type, we can't do the check now, so we
1118 // assume that it is well-formed. Note that stripping off the
1119 // qualifiers here is not really correct if T turns out to be
1120 // an array type, but we'll recompute the type everywhere it's
1121 // used during instantiation, so that should be OK. (Using the
1122 // qualified type is equally wrong.)
1123 if (T->isDependentType())
1124 return T.getUnqualifiedType();
1125
1126 Diag(Loc, diag::err_template_nontype_parm_bad_type)
1127 << T;
1128
1129 return QualType();
1130}
1131
1132NamedDecl *Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
1133 unsigned Depth,
1134 unsigned Position,
1135 SourceLocation EqualLoc,
1136 Expr *Default) {
1137 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
1138
1139 // Check that we have valid decl-specifiers specified.
1140 auto CheckValidDeclSpecifiers = [this, &D] {
1141 // C++ [temp.param]
1142 // p1
1143 // template-parameter:
1144 // ...
1145 // parameter-declaration
1146 // p2
1147 // ... A storage class shall not be specified in a template-parameter
1148 // declaration.
1149 // [dcl.typedef]p1:
1150 // The typedef specifier [...] shall not be used in the decl-specifier-seq
1151 // of a parameter-declaration
1152 const DeclSpec &DS = D.getDeclSpec();
1153 auto EmitDiag = [this](SourceLocation Loc) {
1154 Diag(Loc, diag::err_invalid_decl_specifier_in_nontype_parm)
1155 << FixItHint::CreateRemoval(Loc);
1156 };
1157 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified)
1158 EmitDiag(DS.getStorageClassSpecLoc());
1159
1160 if (DS.getThreadStorageClassSpec() != TSCS_unspecified)
1161 EmitDiag(DS.getThreadStorageClassSpecLoc());
1162
1163 // [dcl.inline]p1:
1164 // The inline specifier can be applied only to the declaration or
1165 // definition of a variable or function.
1166
1167 if (DS.isInlineSpecified())
1168 EmitDiag(DS.getInlineSpecLoc());
1169
1170 // [dcl.constexpr]p1:
1171 // The constexpr specifier shall be applied only to the definition of a
1172 // variable or variable template or the declaration of a function or
1173 // function template.
1174
1175 if (DS.hasConstexprSpecifier())
1176 EmitDiag(DS.getConstexprSpecLoc());
1177
1178 // [dcl.fct.spec]p1:
1179 // Function-specifiers can be used only in function declarations.
1180
1181 if (DS.isVirtualSpecified())
1182 EmitDiag(DS.getVirtualSpecLoc());
1183
1184 if (DS.hasExplicitSpecifier())
1185 EmitDiag(DS.getExplicitSpecLoc());
1186
1187 if (DS.isNoreturnSpecified())
1188 EmitDiag(DS.getNoreturnSpecLoc());
1189 };
1190
1191 CheckValidDeclSpecifiers();
1192
1193 if (TInfo->getType()->isUndeducedType()) {
1194 Diag(D.getIdentifierLoc(),
1195 diag::warn_cxx14_compat_template_nontype_parm_auto_type)
1196 << QualType(TInfo->getType()->getContainedAutoType(), 0);
1197 }
1198
1199 assert(S->isTemplateParamScope() &&((S->isTemplateParamScope() && "Non-type template parameter not in template parameter scope!"
) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Non-type template parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1200, __PRETTY_FUNCTION__))
1200 "Non-type template parameter not in template parameter scope!")((S->isTemplateParamScope() && "Non-type template parameter not in template parameter scope!"
) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Non-type template parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1200, __PRETTY_FUNCTION__))
;
1201 bool Invalid = false;
1202
1203 QualType T = CheckNonTypeTemplateParameterType(TInfo, D.getIdentifierLoc());
1204 if (T.isNull()) {
1205 T = Context.IntTy; // Recover with an 'int' type.
1206 Invalid = true;
1207 }
1208
1209 CheckFunctionOrTemplateParamDeclarator(S, D);
1210
1211 IdentifierInfo *ParamName = D.getIdentifier();
1212 bool IsParameterPack = D.hasEllipsis();
1213 NonTypeTemplateParmDecl *Param = NonTypeTemplateParmDecl::Create(
1214 Context, Context.getTranslationUnitDecl(), D.getBeginLoc(),
1215 D.getIdentifierLoc(), Depth, Position, ParamName, T, IsParameterPack,
1216 TInfo);
1217 Param->setAccess(AS_public);
1218
1219 if (Invalid)
1220 Param->setInvalidDecl();
1221
1222 if (Param->isParameterPack())
1223 if (auto *LSI = getEnclosingLambda())
1224 LSI->LocalPacks.push_back(Param);
1225
1226 if (ParamName) {
1227 maybeDiagnoseTemplateParameterShadow(*this, S, D.getIdentifierLoc(),
1228 ParamName);
1229
1230 // Add the template parameter into the current scope.
1231 S->AddDecl(Param);
1232 IdResolver.AddDecl(Param);
1233 }
1234
1235 // C++0x [temp.param]p9:
1236 // A default template-argument may be specified for any kind of
1237 // template-parameter that is not a template parameter pack.
1238 if (Default && IsParameterPack) {
1239 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
1240 Default = nullptr;
1241 }
1242
1243 // Check the well-formedness of the default template argument, if provided.
1244 if (Default) {
1245 // Check for unexpanded parameter packs.
1246 if (DiagnoseUnexpandedParameterPack(Default, UPPC_DefaultArgument))
1247 return Param;
1248
1249 TemplateArgument Converted;
1250 ExprResult DefaultRes =
1251 CheckTemplateArgument(Param, Param->getType(), Default, Converted);
1252 if (DefaultRes.isInvalid()) {
1253 Param->setInvalidDecl();
1254 return Param;
1255 }
1256 Default = DefaultRes.get();
1257
1258 Param->setDefaultArgument(Default);
1259 }
1260
1261 return Param;
1262}
1263
1264/// ActOnTemplateTemplateParameter - Called when a C++ template template
1265/// parameter (e.g. T in template <template \<typename> class T> class array)
1266/// has been parsed. S is the current scope.
1267NamedDecl *Sema::ActOnTemplateTemplateParameter(Scope* S,
1268 SourceLocation TmpLoc,
1269 TemplateParameterList *Params,
1270 SourceLocation EllipsisLoc,
1271 IdentifierInfo *Name,
1272 SourceLocation NameLoc,
1273 unsigned Depth,
1274 unsigned Position,
1275 SourceLocation EqualLoc,
1276 ParsedTemplateArgument Default) {
1277 assert(S->isTemplateParamScope() &&((S->isTemplateParamScope() && "Template template parameter not in template parameter scope!"
) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Template template parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1278, __PRETTY_FUNCTION__))
1278 "Template template parameter not in template parameter scope!")((S->isTemplateParamScope() && "Template template parameter not in template parameter scope!"
) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Template template parameter not in template parameter scope!\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1278, __PRETTY_FUNCTION__))
;
1279
1280 // Construct the parameter object.
1281 bool IsParameterPack = EllipsisLoc.isValid();
1282 TemplateTemplateParmDecl *Param =
1283 TemplateTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(),
1284 NameLoc.isInvalid()? TmpLoc : NameLoc,
1285 Depth, Position, IsParameterPack,
1286 Name, Params);
1287 Param->setAccess(AS_public);
1288
1289 if (Param->isParameterPack())
1290 if (auto *LSI = getEnclosingLambda())
1291 LSI->LocalPacks.push_back(Param);
1292
1293 // If the template template parameter has a name, then link the identifier
1294 // into the scope and lookup mechanisms.
1295 if (Name) {
1296 maybeDiagnoseTemplateParameterShadow(*this, S, NameLoc, Name);
1297
1298 S->AddDecl(Param);
1299 IdResolver.AddDecl(Param);
1300 }
1301
1302 if (Params->size() == 0) {
1303 Diag(Param->getLocation(), diag::err_template_template_parm_no_parms)
1304 << SourceRange(Params->getLAngleLoc(), Params->getRAngleLoc());
1305 Param->setInvalidDecl();
1306 }
1307
1308 // C++0x [temp.param]p9:
1309 // A default template-argument may be specified for any kind of
1310 // template-parameter that is not a template parameter pack.
1311 if (IsParameterPack && !Default.isInvalid()) {
1312 Diag(EqualLoc, diag::err_template_param_pack_default_arg);
1313 Default = ParsedTemplateArgument();
1314 }
1315
1316 if (!Default.isInvalid()) {
1317 // Check only that we have a template template argument. We don't want to
1318 // try to check well-formedness now, because our template template parameter
1319 // might have dependent types in its template parameters, which we wouldn't
1320 // be able to match now.
1321 //
1322 // If none of the template template parameter's template arguments mention
1323 // other template parameters, we could actually perform more checking here.
1324 // However, it isn't worth doing.
1325 TemplateArgumentLoc DefaultArg = translateTemplateArgument(*this, Default);
1326 if (DefaultArg.getArgument().getAsTemplate().isNull()) {
1327 Diag(DefaultArg.getLocation(), diag::err_template_arg_not_valid_template)
1328 << DefaultArg.getSourceRange();
1329 return Param;
1330 }
1331
1332 // Check for unexpanded parameter packs.
1333 if (DiagnoseUnexpandedParameterPack(DefaultArg.getLocation(),
1334 DefaultArg.getArgument().getAsTemplate(),
1335 UPPC_DefaultArgument))
1336 return Param;
1337
1338 Param->setDefaultArgument(Context, DefaultArg);
1339 }
1340
1341 return Param;
1342}
1343
1344/// ActOnTemplateParameterList - Builds a TemplateParameterList, optionally
1345/// constrained by RequiresClause, that contains the template parameters in
1346/// Params.
1347TemplateParameterList *
1348Sema::ActOnTemplateParameterList(unsigned Depth,
1349 SourceLocation ExportLoc,
1350 SourceLocation TemplateLoc,
1351 SourceLocation LAngleLoc,
1352 ArrayRef<NamedDecl *> Params,
1353 SourceLocation RAngleLoc,
1354 Expr *RequiresClause) {
1355 if (ExportLoc.isValid())
1356 Diag(ExportLoc, diag::warn_template_export_unsupported);
1357
1358 return TemplateParameterList::Create(
1359 Context, TemplateLoc, LAngleLoc,
1360 llvm::makeArrayRef(Params.data(), Params.size()),
1361 RAngleLoc, RequiresClause);
1362}
1363
1364static void SetNestedNameSpecifier(Sema &S, TagDecl *T,
1365 const CXXScopeSpec &SS) {
1366 if (SS.isSet())
1367 T->setQualifierInfo(SS.getWithLocInContext(S.Context));
1368}
1369
1370DeclResult Sema::CheckClassTemplate(
1371 Scope *S, unsigned TagSpec, TagUseKind TUK, SourceLocation KWLoc,
1372 CXXScopeSpec &SS, IdentifierInfo *Name, SourceLocation NameLoc,
1373 const ParsedAttributesView &Attr, TemplateParameterList *TemplateParams,
1374 AccessSpecifier AS, SourceLocation ModulePrivateLoc,
1375 SourceLocation FriendLoc, unsigned NumOuterTemplateParamLists,
1376 TemplateParameterList **OuterTemplateParamLists, SkipBodyInfo *SkipBody) {
1377 assert(TemplateParams && TemplateParams->size() > 0 &&((TemplateParams && TemplateParams->size() > 0 &&
"No template parameters") ? static_cast<void> (0) : __assert_fail
("TemplateParams && TemplateParams->size() > 0 && \"No template parameters\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1378, __PRETTY_FUNCTION__))
1378 "No template parameters")((TemplateParams && TemplateParams->size() > 0 &&
"No template parameters") ? static_cast<void> (0) : __assert_fail
("TemplateParams && TemplateParams->size() > 0 && \"No template parameters\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1378, __PRETTY_FUNCTION__))
;
1379 assert(TUK != TUK_Reference && "Can only declare or define class templates")((TUK != TUK_Reference && "Can only declare or define class templates"
) ? static_cast<void> (0) : __assert_fail ("TUK != TUK_Reference && \"Can only declare or define class templates\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1379, __PRETTY_FUNCTION__))
;
1380 bool Invalid = false;
1381
1382 // Check that we can declare a template here.
1383 if (CheckTemplateDeclScope(S, TemplateParams))
1384 return true;
1385
1386 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
1387 assert(Kind != TTK_Enum && "can't build template of enumerated type")((Kind != TTK_Enum && "can't build template of enumerated type"
) ? static_cast<void> (0) : __assert_fail ("Kind != TTK_Enum && \"can't build template of enumerated type\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1387, __PRETTY_FUNCTION__))
;
1388
1389 // There is no such thing as an unnamed class template.
1390 if (!Name) {
1391 Diag(KWLoc, diag::err_template_unnamed_class);
1392 return true;
1393 }
1394
1395 // Find any previous declaration with this name. For a friend with no
1396 // scope explicitly specified, we only look for tag declarations (per
1397 // C++11 [basic.lookup.elab]p2).
1398 DeclContext *SemanticContext;
1399 LookupResult Previous(*this, Name, NameLoc,
1400 (SS.isEmpty() && TUK == TUK_Friend)
1401 ? LookupTagName : LookupOrdinaryName,
1402 forRedeclarationInCurContext());
1403 if (SS.isNotEmpty() && !SS.isInvalid()) {
1404 SemanticContext = computeDeclContext(SS, true);
1405 if (!SemanticContext) {
1406 // FIXME: Horrible, horrible hack! We can't currently represent this
1407 // in the AST, and historically we have just ignored such friend
1408 // class templates, so don't complain here.
1409 Diag(NameLoc, TUK == TUK_Friend
1410 ? diag::warn_template_qualified_friend_ignored
1411 : diag::err_template_qualified_declarator_no_match)
1412 << SS.getScopeRep() << SS.getRange();
1413 return TUK != TUK_Friend;
1414 }
1415
1416 if (RequireCompleteDeclContext(SS, SemanticContext))
1417 return true;
1418
1419 // If we're adding a template to a dependent context, we may need to
1420 // rebuilding some of the types used within the template parameter list,
1421 // now that we know what the current instantiation is.
1422 if (SemanticContext->isDependentContext()) {
1423 ContextRAII SavedContext(*this, SemanticContext);
1424 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams))
1425 Invalid = true;
1426 } else if (TUK != TUK_Friend && TUK != TUK_Reference)
1427 diagnoseQualifiedDeclaration(SS, SemanticContext, Name, NameLoc, false);
1428
1429 LookupQualifiedName(Previous, SemanticContext);
1430 } else {
1431 SemanticContext = CurContext;
1432
1433 // C++14 [class.mem]p14:
1434 // If T is the name of a class, then each of the following shall have a
1435 // name different from T:
1436 // -- every member template of class T
1437 if (TUK != TUK_Friend &&
1438 DiagnoseClassNameShadow(SemanticContext,
1439 DeclarationNameInfo(Name, NameLoc)))
1440 return true;
1441
1442 LookupName(Previous, S);
1443 }
1444
1445 if (Previous.isAmbiguous())
1446 return true;
1447
1448 NamedDecl *PrevDecl = nullptr;
1449 if (Previous.begin() != Previous.end())
1450 PrevDecl = (*Previous.begin())->getUnderlyingDecl();
1451
1452 if (PrevDecl && PrevDecl->isTemplateParameter()) {
1453 // Maybe we will complain about the shadowed template parameter.
1454 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl);
1455 // Just pretend that we didn't see the previous declaration.
1456 PrevDecl = nullptr;
1457 }
1458
1459 // If there is a previous declaration with the same name, check
1460 // whether this is a valid redeclaration.
1461 ClassTemplateDecl *PrevClassTemplate =
1462 dyn_cast_or_null<ClassTemplateDecl>(PrevDecl);
1463
1464 // We may have found the injected-class-name of a class template,
1465 // class template partial specialization, or class template specialization.
1466 // In these cases, grab the template that is being defined or specialized.
1467 if (!PrevClassTemplate && PrevDecl && isa<CXXRecordDecl>(PrevDecl) &&
1468 cast<CXXRecordDecl>(PrevDecl)->isInjectedClassName()) {
1469 PrevDecl = cast<CXXRecordDecl>(PrevDecl->getDeclContext());
1470 PrevClassTemplate
1471 = cast<CXXRecordDecl>(PrevDecl)->getDescribedClassTemplate();
1472 if (!PrevClassTemplate && isa<ClassTemplateSpecializationDecl>(PrevDecl)) {
1473 PrevClassTemplate
1474 = cast<ClassTemplateSpecializationDecl>(PrevDecl)
1475 ->getSpecializedTemplate();
1476 }
1477 }
1478
1479 if (TUK == TUK_Friend) {
1480 // C++ [namespace.memdef]p3:
1481 // [...] When looking for a prior declaration of a class or a function
1482 // declared as a friend, and when the name of the friend class or
1483 // function is neither a qualified name nor a template-id, scopes outside
1484 // the innermost enclosing namespace scope are not considered.
1485 if (!SS.isSet()) {
1486 DeclContext *OutermostContext = CurContext;
1487 while (!OutermostContext->isFileContext())
1488 OutermostContext = OutermostContext->getLookupParent();
1489
1490 if (PrevDecl &&
1491 (OutermostContext->Equals(PrevDecl->getDeclContext()) ||
1492 OutermostContext->Encloses(PrevDecl->getDeclContext()))) {
1493 SemanticContext = PrevDecl->getDeclContext();
1494 } else {
1495 // Declarations in outer scopes don't matter. However, the outermost
1496 // context we computed is the semantic context for our new
1497 // declaration.
1498 PrevDecl = PrevClassTemplate = nullptr;
1499 SemanticContext = OutermostContext;
1500
1501 // Check that the chosen semantic context doesn't already contain a
1502 // declaration of this name as a non-tag type.
1503 Previous.clear(LookupOrdinaryName);
1504 DeclContext *LookupContext = SemanticContext;
1505 while (LookupContext->isTransparentContext())
1506 LookupContext = LookupContext->getLookupParent();
1507 LookupQualifiedName(Previous, LookupContext);
1508
1509 if (Previous.isAmbiguous())
1510 return true;
1511
1512 if (Previous.begin() != Previous.end())
1513 PrevDecl = (*Previous.begin())->getUnderlyingDecl();
1514 }
1515 }
1516 } else if (PrevDecl &&
1517 !isDeclInScope(Previous.getRepresentativeDecl(), SemanticContext,
1518 S, SS.isValid()))
1519 PrevDecl = PrevClassTemplate = nullptr;
1520
1521 if (auto *Shadow = dyn_cast_or_null<UsingShadowDecl>(
1522 PrevDecl ? Previous.getRepresentativeDecl() : nullptr)) {
1523 if (SS.isEmpty() &&
1524 !(PrevClassTemplate &&
1525 PrevClassTemplate->getDeclContext()->getRedeclContext()->Equals(
1526 SemanticContext->getRedeclContext()))) {
1527 Diag(KWLoc, diag::err_using_decl_conflict_reverse);
1528 Diag(Shadow->getTargetDecl()->getLocation(),
1529 diag::note_using_decl_target);
1530 Diag(Shadow->getUsingDecl()->getLocation(), diag::note_using_decl) << 0;
1531 // Recover by ignoring the old declaration.
1532 PrevDecl = PrevClassTemplate = nullptr;
1533 }
1534 }
1535
1536 // TODO Memory management; associated constraints are not always stored.
1537 Expr *const CurAC = formAssociatedConstraints(TemplateParams, nullptr);
1538
1539 if (PrevClassTemplate) {
1540 // Ensure that the template parameter lists are compatible. Skip this check
1541 // for a friend in a dependent context: the template parameter list itself
1542 // could be dependent.
1543 if (!(TUK == TUK_Friend && CurContext->isDependentContext()) &&
1544 !TemplateParameterListsAreEqual(TemplateParams,
1545 PrevClassTemplate->getTemplateParameters(),
1546 /*Complain=*/true,
1547 TPL_TemplateMatch))
1548 return true;
1549
1550 // Check for matching associated constraints on redeclarations.
1551 const Expr *const PrevAC = PrevClassTemplate->getAssociatedConstraints();
1552 const bool RedeclACMismatch = [&] {
1553 if (!(CurAC || PrevAC))
1554 return false; // Nothing to check; no mismatch.
1555 if (CurAC && PrevAC) {
1556 llvm::FoldingSetNodeID CurACInfo, PrevACInfo;
1557 CurAC->Profile(CurACInfo, Context, /*Canonical=*/true);
1558 PrevAC->Profile(PrevACInfo, Context, /*Canonical=*/true);
1559 if (CurACInfo == PrevACInfo)
1560 return false; // All good; no mismatch.
1561 }
1562 return true;
1563 }();
1564
1565 if (RedeclACMismatch) {
1566 Diag(CurAC ? CurAC->getBeginLoc() : NameLoc,
1567 diag::err_template_different_associated_constraints);
1568 Diag(PrevAC ? PrevAC->getBeginLoc() : PrevClassTemplate->getLocation(),
1569 diag::note_template_prev_declaration)
1570 << /*declaration*/ 0;
1571 return true;
1572 }
1573
1574 // C++ [temp.class]p4:
1575 // In a redeclaration, partial specialization, explicit
1576 // specialization or explicit instantiation of a class template,
1577 // the class-key shall agree in kind with the original class
1578 // template declaration (7.1.5.3).
1579 RecordDecl *PrevRecordDecl = PrevClassTemplate->getTemplatedDecl();
1580 if (!isAcceptableTagRedeclaration(PrevRecordDecl, Kind,
1581 TUK == TUK_Definition, KWLoc, Name)) {
1582 Diag(KWLoc, diag::err_use_with_wrong_tag)
1583 << Name
1584 << FixItHint::CreateReplacement(KWLoc, PrevRecordDecl->getKindName());
1585 Diag(PrevRecordDecl->getLocation(), diag::note_previous_use);
1586 Kind = PrevRecordDecl->getTagKind();
1587 }
1588
1589 // Check for redefinition of this class template.
1590 if (TUK == TUK_Definition) {
1591 if (TagDecl *Def = PrevRecordDecl->getDefinition()) {
1592 // If we have a prior definition that is not visible, treat this as
1593 // simply making that previous definition visible.
1594 NamedDecl *Hidden = nullptr;
1595 if (SkipBody && !hasVisibleDefinition(Def, &Hidden)) {
1596 SkipBody->ShouldSkip = true;
1597 SkipBody->Previous = Def;
1598 auto *Tmpl = cast<CXXRecordDecl>(Hidden)->getDescribedClassTemplate();
1599 assert(Tmpl && "original definition of a class template is not a "((Tmpl && "original definition of a class template is not a "
"class template?") ? static_cast<void> (0) : __assert_fail
("Tmpl && \"original definition of a class template is not a \" \"class template?\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1600, __PRETTY_FUNCTION__))
1600 "class template?")((Tmpl && "original definition of a class template is not a "
"class template?") ? static_cast<void> (0) : __assert_fail
("Tmpl && \"original definition of a class template is not a \" \"class template?\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1600, __PRETTY_FUNCTION__))
;
1601 makeMergedDefinitionVisible(Hidden);
1602 makeMergedDefinitionVisible(Tmpl);
1603 } else {
1604 Diag(NameLoc, diag::err_redefinition) << Name;
1605 Diag(Def->getLocation(), diag::note_previous_definition);
1606 // FIXME: Would it make sense to try to "forget" the previous
1607 // definition, as part of error recovery?
1608 return true;
1609 }
1610 }
1611 }
1612 } else if (PrevDecl) {
1613 // C++ [temp]p5:
1614 // A class template shall not have the same name as any other
1615 // template, class, function, object, enumeration, enumerator,
1616 // namespace, or type in the same scope (3.3), except as specified
1617 // in (14.5.4).
1618 Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
1619 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
1620 return true;
1621 }
1622
1623 // Check the template parameter list of this declaration, possibly
1624 // merging in the template parameter list from the previous class
1625 // template declaration. Skip this check for a friend in a dependent
1626 // context, because the template parameter list might be dependent.
1627 if (!(TUK == TUK_Friend && CurContext->isDependentContext()) &&
1628 CheckTemplateParameterList(
1629 TemplateParams,
1630 PrevClassTemplate
1631 ? PrevClassTemplate->getMostRecentDecl()->getTemplateParameters()
1632 : nullptr,
1633 (SS.isSet() && SemanticContext && SemanticContext->isRecord() &&
1634 SemanticContext->isDependentContext())
1635 ? TPC_ClassTemplateMember
1636 : TUK == TUK_Friend ? TPC_FriendClassTemplate : TPC_ClassTemplate,
1637 SkipBody))
1638 Invalid = true;
1639
1640 if (SS.isSet()) {
1641 // If the name of the template was qualified, we must be defining the
1642 // template out-of-line.
1643 if (!SS.isInvalid() && !Invalid && !PrevClassTemplate) {
1644 Diag(NameLoc, TUK == TUK_Friend ? diag::err_friend_decl_does_not_match
1645 : diag::err_member_decl_does_not_match)
1646 << Name << SemanticContext << /*IsDefinition*/true << SS.getRange();
1647 Invalid = true;
1648 }
1649 }
1650
1651 // If this is a templated friend in a dependent context we should not put it
1652 // on the redecl chain. In some cases, the templated friend can be the most
1653 // recent declaration tricking the template instantiator to make substitutions
1654 // there.
1655 // FIXME: Figure out how to combine with shouldLinkDependentDeclWithPrevious
1656 bool ShouldAddRedecl
1657 = !(TUK == TUK_Friend && CurContext->isDependentContext());
1658
1659 CXXRecordDecl *NewClass =
1660 CXXRecordDecl::Create(Context, Kind, SemanticContext, KWLoc, NameLoc, Name,
1661 PrevClassTemplate && ShouldAddRedecl ?
1662 PrevClassTemplate->getTemplatedDecl() : nullptr,
1663 /*DelayTypeCreation=*/true);
1664 SetNestedNameSpecifier(*this, NewClass, SS);
1665 if (NumOuterTemplateParamLists > 0)
1666 NewClass->setTemplateParameterListsInfo(
1667 Context, llvm::makeArrayRef(OuterTemplateParamLists,
1668 NumOuterTemplateParamLists));
1669
1670 // Add alignment attributes if necessary; these attributes are checked when
1671 // the ASTContext lays out the structure.
1672 if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) {
1673 AddAlignmentAttributesForRecord(NewClass);
1674 AddMsStructLayoutForRecord(NewClass);
1675 }
1676
1677 // Attach the associated constraints when the declaration will not be part of
1678 // a decl chain.
1679 Expr *const ACtoAttach =
1680 PrevClassTemplate && ShouldAddRedecl ? nullptr : CurAC;
1681
1682 ClassTemplateDecl *NewTemplate
1683 = ClassTemplateDecl::Create(Context, SemanticContext, NameLoc,
1684 DeclarationName(Name), TemplateParams,
1685 NewClass, ACtoAttach);
1686
1687 if (ShouldAddRedecl)
1688 NewTemplate->setPreviousDecl(PrevClassTemplate);
1689
1690 NewClass->setDescribedClassTemplate(NewTemplate);
1691
1692 if (ModulePrivateLoc.isValid())
1693 NewTemplate->setModulePrivate();
1694
1695 // Build the type for the class template declaration now.
1696 QualType T = NewTemplate->getInjectedClassNameSpecialization();
1697 T = Context.getInjectedClassNameType(NewClass, T);
1698 assert(T->isDependentType() && "Class template type is not dependent?")((T->isDependentType() && "Class template type is not dependent?"
) ? static_cast<void> (0) : __assert_fail ("T->isDependentType() && \"Class template type is not dependent?\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1698, __PRETTY_FUNCTION__))
;
1699 (void)T;
1700
1701 // If we are providing an explicit specialization of a member that is a
1702 // class template, make a note of that.
1703 if (PrevClassTemplate &&
1704 PrevClassTemplate->getInstantiatedFromMemberTemplate())
1705 PrevClassTemplate->setMemberSpecialization();
1706
1707 // Set the access specifier.
1708 if (!Invalid && TUK != TUK_Friend && NewTemplate->getDeclContext()->isRecord())
1709 SetMemberAccessSpecifier(NewTemplate, PrevClassTemplate, AS);
1710
1711 // Set the lexical context of these templates
1712 NewClass->setLexicalDeclContext(CurContext);
1713 NewTemplate->setLexicalDeclContext(CurContext);
1714
1715 if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip))
1716 NewClass->startDefinition();
1717
1718 ProcessDeclAttributeList(S, NewClass, Attr);
1719
1720 if (PrevClassTemplate)
1721 mergeDeclAttributes(NewClass, PrevClassTemplate->getTemplatedDecl());
1722
1723 AddPushedVisibilityAttribute(NewClass);
1724 inferGslOwnerPointerAttribute(NewClass);
1725
1726 if (TUK != TUK_Friend) {
1727 // Per C++ [basic.scope.temp]p2, skip the template parameter scopes.
1728 Scope *Outer = S;
1729 while ((Outer->getFlags() & Scope::TemplateParamScope) != 0)
1730 Outer = Outer->getParent();
1731 PushOnScopeChains(NewTemplate, Outer);
1732 } else {
1733 if (PrevClassTemplate && PrevClassTemplate->getAccess() != AS_none) {
1734 NewTemplate->setAccess(PrevClassTemplate->getAccess());
1735 NewClass->setAccess(PrevClassTemplate->getAccess());
1736 }
1737
1738 NewTemplate->setObjectOfFriendDecl();
1739
1740 // Friend templates are visible in fairly strange ways.
1741 if (!CurContext->isDependentContext()) {
1742 DeclContext *DC = SemanticContext->getRedeclContext();
1743 DC->makeDeclVisibleInContext(NewTemplate);
1744 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
1745 PushOnScopeChains(NewTemplate, EnclosingScope,
1746 /* AddToContext = */ false);
1747 }
1748
1749 FriendDecl *Friend = FriendDecl::Create(
1750 Context, CurContext, NewClass->getLocation(), NewTemplate, FriendLoc);
1751 Friend->setAccess(AS_public);
1752 CurContext->addDecl(Friend);
1753 }
1754
1755 if (PrevClassTemplate)
1756 CheckRedeclarationModuleOwnership(NewTemplate, PrevClassTemplate);
1757
1758 if (Invalid) {
1759 NewTemplate->setInvalidDecl();
1760 NewClass->setInvalidDecl();
1761 }
1762
1763 ActOnDocumentableDecl(NewTemplate);
1764
1765 if (SkipBody && SkipBody->ShouldSkip)
1766 return SkipBody->Previous;
1767
1768 return NewTemplate;
1769}
1770
1771namespace {
1772/// Tree transform to "extract" a transformed type from a class template's
1773/// constructor to a deduction guide.
1774class ExtractTypeForDeductionGuide
1775 : public TreeTransform<ExtractTypeForDeductionGuide> {
1776public:
1777 typedef TreeTransform<ExtractTypeForDeductionGuide> Base;
1778 ExtractTypeForDeductionGuide(Sema &SemaRef) : Base(SemaRef) {}
1779
1780 TypeSourceInfo *transform(TypeSourceInfo *TSI) { return TransformType(TSI); }
1781
1782 QualType TransformTypedefType(TypeLocBuilder &TLB, TypedefTypeLoc TL) {
1783 return TransformType(
1784 TLB,
1785 TL.getTypedefNameDecl()->getTypeSourceInfo()->getTypeLoc());
1786 }
1787};
1788
1789/// Transform to convert portions of a constructor declaration into the
1790/// corresponding deduction guide, per C++1z [over.match.class.deduct]p1.
1791struct ConvertConstructorToDeductionGuideTransform {
1792 ConvertConstructorToDeductionGuideTransform(Sema &S,
1793 ClassTemplateDecl *Template)
1794 : SemaRef(S), Template(Template) {}
1795
1796 Sema &SemaRef;
1797 ClassTemplateDecl *Template;
1798
1799 DeclContext *DC = Template->getDeclContext();
1800 CXXRecordDecl *Primary = Template->getTemplatedDecl();
1801 DeclarationName DeductionGuideName =
1802 SemaRef.Context.DeclarationNames.getCXXDeductionGuideName(Template);
1803
1804 QualType DeducedType = SemaRef.Context.getTypeDeclType(Primary);
1805
1806 // Index adjustment to apply to convert depth-1 template parameters into
1807 // depth-0 template parameters.
1808 unsigned Depth1IndexAdjustment = Template->getTemplateParameters()->size();
1809
1810 /// Transform a constructor declaration into a deduction guide.
1811 NamedDecl *transformConstructor(FunctionTemplateDecl *FTD,
1812 CXXConstructorDecl *CD) {
1813 SmallVector<TemplateArgument, 16> SubstArgs;
1814
1815 LocalInstantiationScope Scope(SemaRef);
1816
1817 // C++ [over.match.class.deduct]p1:
1818 // -- For each constructor of the class template designated by the
1819 // template-name, a function template with the following properties:
1820
1821 // -- The template parameters are the template parameters of the class
1822 // template followed by the template parameters (including default
1823 // template arguments) of the constructor, if any.
1824 TemplateParameterList *TemplateParams = Template->getTemplateParameters();
1825 if (FTD
16.1
'FTD' is non-null
) {
17
Taking true branch
1826 TemplateParameterList *InnerParams = FTD->getTemplateParameters();
1827 SmallVector<NamedDecl *, 16> AllParams;
1828 AllParams.reserve(TemplateParams->size() + InnerParams->size());
1829 AllParams.insert(AllParams.begin(),
1830 TemplateParams->begin(), TemplateParams->end());
1831 SubstArgs.reserve(InnerParams->size());
1832
1833 // Later template parameters could refer to earlier ones, so build up
1834 // a list of substituted template arguments as we go.
1835 for (NamedDecl *Param : *InnerParams) {
18
Assuming '__begin3' is not equal to '__end3'
1836 MultiLevelTemplateArgumentList Args;
1837 Args.addOuterTemplateArguments(SubstArgs);
1838 Args.addOuterRetainedLevel();
1839 NamedDecl *NewParam = transformTemplateParameter(Param, Args);
19
Calling 'ConvertConstructorToDeductionGuideTransform::transformTemplateParameter'
1840 if (!NewParam)
1841 return nullptr;
1842 AllParams.push_back(NewParam);
1843 SubstArgs.push_back(SemaRef.Context.getCanonicalTemplateArgument(
1844 SemaRef.Context.getInjectedTemplateArg(NewParam)));
1845 }
1846 TemplateParams = TemplateParameterList::Create(
1847 SemaRef.Context, InnerParams->getTemplateLoc(),
1848 InnerParams->getLAngleLoc(), AllParams, InnerParams->getRAngleLoc(),
1849 /*FIXME: RequiresClause*/ nullptr);
1850 }
1851
1852 // If we built a new template-parameter-list, track that we need to
1853 // substitute references to the old parameters into references to the
1854 // new ones.
1855 MultiLevelTemplateArgumentList Args;
1856 if (FTD) {
1857 Args.addOuterTemplateArguments(SubstArgs);
1858 Args.addOuterRetainedLevel();
1859 }
1860
1861 FunctionProtoTypeLoc FPTL = CD->getTypeSourceInfo()->getTypeLoc()
1862 .getAsAdjusted<FunctionProtoTypeLoc>();
1863 assert(FPTL && "no prototype for constructor declaration")((FPTL && "no prototype for constructor declaration")
? static_cast<void> (0) : __assert_fail ("FPTL && \"no prototype for constructor declaration\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1863, __PRETTY_FUNCTION__))
;
1864
1865 // Transform the type of the function, adjusting the return type and
1866 // replacing references to the old parameters with references to the
1867 // new ones.
1868 TypeLocBuilder TLB;
1869 SmallVector<ParmVarDecl*, 8> Params;
1870 QualType NewType = transformFunctionProtoType(TLB, FPTL, Params, Args);
1871 if (NewType.isNull())
1872 return nullptr;
1873 TypeSourceInfo *NewTInfo = TLB.getTypeSourceInfo(SemaRef.Context, NewType);
1874
1875 return buildDeductionGuide(TemplateParams, CD->getExplicitSpecifier(),
1876 NewTInfo, CD->getBeginLoc(), CD->getLocation(),
1877 CD->getEndLoc());
1878 }
1879
1880 /// Build a deduction guide with the specified parameter types.
1881 NamedDecl *buildSimpleDeductionGuide(MutableArrayRef<QualType> ParamTypes) {
1882 SourceLocation Loc = Template->getLocation();
1883
1884 // Build the requested type.
1885 FunctionProtoType::ExtProtoInfo EPI;
1886 EPI.HasTrailingReturn = true;
1887 QualType Result = SemaRef.BuildFunctionType(DeducedType, ParamTypes, Loc,
1888 DeductionGuideName, EPI);
1889 TypeSourceInfo *TSI = SemaRef.Context.getTrivialTypeSourceInfo(Result, Loc);
1890
1891 FunctionProtoTypeLoc FPTL =
1892 TSI->getTypeLoc().castAs<FunctionProtoTypeLoc>();
1893
1894 // Build the parameters, needed during deduction / substitution.
1895 SmallVector<ParmVarDecl*, 4> Params;
1896 for (auto T : ParamTypes) {
1897 ParmVarDecl *NewParam = ParmVarDecl::Create(
1898 SemaRef.Context, DC, Loc, Loc, nullptr, T,
1899 SemaRef.Context.getTrivialTypeSourceInfo(T, Loc), SC_None, nullptr);
1900 NewParam->setScopeInfo(0, Params.size());
1901 FPTL.setParam(Params.size(), NewParam);
1902 Params.push_back(NewParam);
1903 }
1904
1905 return buildDeductionGuide(Template->getTemplateParameters(),
1906 ExplicitSpecifier(), TSI, Loc, Loc, Loc);
1907 }
1908
1909private:
1910 /// Transform a constructor template parameter into a deduction guide template
1911 /// parameter, rebuilding any internal references to earlier parameters and
1912 /// renumbering as we go.
1913 NamedDecl *transformTemplateParameter(NamedDecl *TemplateParam,
1914 MultiLevelTemplateArgumentList &Args) {
1915 if (auto *TTP
20.1
'TTP' is null
= dyn_cast<TemplateTypeParmDecl>(TemplateParam)) {
20
Assuming 'TemplateParam' is not a 'TemplateTypeParmDecl'
21
Taking false branch
1916 // TemplateTypeParmDecl's index cannot be changed after creation, so
1917 // substitute it directly.
1918 auto *NewTTP = TemplateTypeParmDecl::Create(
1919 SemaRef.Context, DC, TTP->getBeginLoc(), TTP->getLocation(),
1920 /*Depth*/ 0, Depth1IndexAdjustment + TTP->getIndex(),
1921 TTP->getIdentifier(), TTP->wasDeclaredWithTypename(),
1922 TTP->isParameterPack());
1923 if (TTP->hasDefaultArgument()) {
1924 TypeSourceInfo *InstantiatedDefaultArg =
1925 SemaRef.SubstType(TTP->getDefaultArgumentInfo(), Args,
1926 TTP->getDefaultArgumentLoc(), TTP->getDeclName());
1927 if (InstantiatedDefaultArg)
1928 NewTTP->setDefaultArgument(InstantiatedDefaultArg);
1929 }
1930 SemaRef.CurrentInstantiationScope->InstantiatedLocal(TemplateParam,
1931 NewTTP);
1932 return NewTTP;
1933 }
1934
1935 if (auto *TTP
22.1
'TTP' is non-null
= dyn_cast<TemplateTemplateParmDecl>(TemplateParam))
22
Assuming 'TemplateParam' is a 'TemplateTemplateParmDecl'
23
Taking true branch
1936 return transformTemplateParameterImpl(TTP, Args);
24
Calling 'ConvertConstructorToDeductionGuideTransform::transformTemplateParameterImpl'
1937
1938 return transformTemplateParameterImpl(
1939 cast<NonTypeTemplateParmDecl>(TemplateParam), Args);
1940 }
1941 template<typename TemplateParmDecl>
1942 TemplateParmDecl *
1943 transformTemplateParameterImpl(TemplateParmDecl *OldParam,
1944 MultiLevelTemplateArgumentList &Args) {
1945 // Ask the template instantiator to do the heavy lifting for us, then adjust
1946 // the index of the parameter once it's done.
1947 auto *NewParam =
26
'NewParam' initialized to a null pointer value
1948 cast_or_null<TemplateParmDecl>(SemaRef.SubstDecl(OldParam, DC, Args));
25
Assuming null pointer is passed into cast
1949 assert(NewParam->getDepth() == 0 && "unexpected template param depth")((NewParam->getDepth() == 0 && "unexpected template param depth"
) ? static_cast<void> (0) : __assert_fail ("NewParam->getDepth() == 0 && \"unexpected template param depth\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 1949, __PRETTY_FUNCTION__))
;
27
Called C++ object pointer is null
1950 NewParam->setPosition(NewParam->getPosition() + Depth1IndexAdjustment);
1951 return NewParam;
1952 }
1953
1954 QualType transformFunctionProtoType(TypeLocBuilder &TLB,
1955 FunctionProtoTypeLoc TL,
1956 SmallVectorImpl<ParmVarDecl*> &Params,
1957 MultiLevelTemplateArgumentList &Args) {
1958 SmallVector<QualType, 4> ParamTypes;
1959 const FunctionProtoType *T = TL.getTypePtr();
1960
1961 // -- The types of the function parameters are those of the constructor.
1962 for (auto *OldParam : TL.getParams()) {
1963 ParmVarDecl *NewParam = transformFunctionTypeParam(OldParam, Args);
1964 if (!NewParam)
1965 return QualType();
1966 ParamTypes.push_back(NewParam->getType());
1967 Params.push_back(NewParam);
1968 }
1969
1970 // -- The return type is the class template specialization designated by
1971 // the template-name and template arguments corresponding to the
1972 // template parameters obtained from the class template.
1973 //
1974 // We use the injected-class-name type of the primary template instead.
1975 // This has the convenient property that it is different from any type that
1976 // the user can write in a deduction-guide (because they cannot enter the
1977 // context of the template), so implicit deduction guides can never collide
1978 // with explicit ones.
1979 QualType ReturnType = DeducedType;
1980 TLB.pushTypeSpec(ReturnType).setNameLoc(Primary->getLocation());
1981
1982 // Resolving a wording defect, we also inherit the variadicness of the
1983 // constructor.
1984 FunctionProtoType::ExtProtoInfo EPI;
1985 EPI.Variadic = T->isVariadic();
1986 EPI.HasTrailingReturn = true;
1987
1988 QualType Result = SemaRef.BuildFunctionType(
1989 ReturnType, ParamTypes, TL.getBeginLoc(), DeductionGuideName, EPI);
1990 if (Result.isNull())
1991 return QualType();
1992
1993 FunctionProtoTypeLoc NewTL = TLB.push<FunctionProtoTypeLoc>(Result);
1994 NewTL.setLocalRangeBegin(TL.getLocalRangeBegin());
1995 NewTL.setLParenLoc(TL.getLParenLoc());
1996 NewTL.setRParenLoc(TL.getRParenLoc());
1997 NewTL.setExceptionSpecRange(SourceRange());
1998 NewTL.setLocalRangeEnd(TL.getLocalRangeEnd());
1999 for (unsigned I = 0, E = NewTL.getNumParams(); I != E; ++I)
2000 NewTL.setParam(I, Params[I]);
2001
2002 return Result;
2003 }
2004
2005 ParmVarDecl *
2006 transformFunctionTypeParam(ParmVarDecl *OldParam,
2007 MultiLevelTemplateArgumentList &Args) {
2008 TypeSourceInfo *OldDI = OldParam->getTypeSourceInfo();
2009 TypeSourceInfo *NewDI;
2010 if (auto PackTL = OldDI->getTypeLoc().getAs<PackExpansionTypeLoc>()) {
2011 // Expand out the one and only element in each inner pack.
2012 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, 0);
2013 NewDI =
2014 SemaRef.SubstType(PackTL.getPatternLoc(), Args,
2015 OldParam->getLocation(), OldParam->getDeclName());
2016 if (!NewDI) return nullptr;
2017 NewDI =
2018 SemaRef.CheckPackExpansion(NewDI, PackTL.getEllipsisLoc(),
2019 PackTL.getTypePtr()->getNumExpansions());
2020 } else
2021 NewDI = SemaRef.SubstType(OldDI, Args, OldParam->getLocation(),
2022 OldParam->getDeclName());
2023 if (!NewDI)
2024 return nullptr;
2025
2026 // Extract the type. This (for instance) replaces references to typedef
2027 // members of the current instantiations with the definitions of those
2028 // typedefs, avoiding triggering instantiation of the deduced type during
2029 // deduction.
2030 NewDI = ExtractTypeForDeductionGuide(SemaRef).transform(NewDI);
2031
2032 // Resolving a wording defect, we also inherit default arguments from the
2033 // constructor.
2034 ExprResult NewDefArg;
2035 if (OldParam->hasDefaultArg()) {
2036 NewDefArg = SemaRef.SubstExpr(OldParam->getDefaultArg(), Args);
2037 if (NewDefArg.isInvalid())
2038 return nullptr;
2039 }
2040
2041 ParmVarDecl *NewParam = ParmVarDecl::Create(SemaRef.Context, DC,
2042 OldParam->getInnerLocStart(),
2043 OldParam->getLocation(),
2044 OldParam->getIdentifier(),
2045 NewDI->getType(),
2046 NewDI,
2047 OldParam->getStorageClass(),
2048 NewDefArg.get());
2049 NewParam->setScopeInfo(OldParam->getFunctionScopeDepth(),
2050 OldParam->getFunctionScopeIndex());
2051 SemaRef.CurrentInstantiationScope->InstantiatedLocal(OldParam, NewParam);
2052 return NewParam;
2053 }
2054
2055 NamedDecl *buildDeductionGuide(TemplateParameterList *TemplateParams,
2056 ExplicitSpecifier ES, TypeSourceInfo *TInfo,
2057 SourceLocation LocStart, SourceLocation Loc,
2058 SourceLocation LocEnd) {
2059 DeclarationNameInfo Name(DeductionGuideName, Loc);
2060 ArrayRef<ParmVarDecl *> Params =
2061 TInfo->getTypeLoc().castAs<FunctionProtoTypeLoc>().getParams();
2062
2063 // Build the implicit deduction guide template.
2064 auto *Guide =
2065 CXXDeductionGuideDecl::Create(SemaRef.Context, DC, LocStart, ES, Name,
2066 TInfo->getType(), TInfo, LocEnd);
2067 Guide->setImplicit();
2068 Guide->setParams(Params);
2069
2070 for (auto *Param : Params)
2071 Param->setDeclContext(Guide);
2072
2073 auto *GuideTemplate = FunctionTemplateDecl::Create(
2074 SemaRef.Context, DC, Loc, DeductionGuideName, TemplateParams, Guide);
2075 GuideTemplate->setImplicit();
2076 Guide->setDescribedFunctionTemplate(GuideTemplate);
2077
2078 if (isa<CXXRecordDecl>(DC)) {
2079 Guide->setAccess(AS_public);
2080 GuideTemplate->setAccess(AS_public);
2081 }
2082
2083 DC->addDecl(GuideTemplate);
2084 return GuideTemplate;
2085 }
2086};
2087}
2088
2089void Sema::DeclareImplicitDeductionGuides(TemplateDecl *Template,
2090 SourceLocation Loc) {
2091 if (CXXRecordDecl *DefRecord
1.1
'DefRecord' is null
=
2
Taking false branch
2092 cast<CXXRecordDecl>(Template->getTemplatedDecl())->getDefinition()) {
1
The object is a 'CXXRecordDecl'
2093 TemplateDecl *DescribedTemplate = DefRecord->getDescribedClassTemplate();
2094 Template = DescribedTemplate ? DescribedTemplate : Template;
2095 }
2096
2097 DeclContext *DC = Template->getDeclContext();
2098 if (DC->isDependentContext())
3
Assuming the condition is false
4
Taking false branch
2099 return;
2100
2101 ConvertConstructorToDeductionGuideTransform Transform(
2102 *this, cast<ClassTemplateDecl>(Template));
5
'Template' is a 'ClassTemplateDecl'
2103 if (!isCompleteType(Loc, Transform.DeducedType))
6
Taking false branch
2104 return;
2105
2106 // Check whether we've already declared deduction guides for this template.
2107 // FIXME: Consider storing a flag on the template to indicate this.
2108 auto Existing = DC->lookup(Transform.DeductionGuideName);
2109 for (auto *D : Existing)
2110 if (D->isImplicit())
2111 return;
2112
2113 // In case we were expanding a pack when we attempted to declare deduction
2114 // guides, turn off pack expansion for everything we're about to do.
2115 ArgumentPackSubstitutionIndexRAII SubstIndex(*this, -1);
2116 // Create a template instantiation record to track the "instantiation" of
2117 // constructors into deduction guides.
2118 // FIXME: Add a kind for this to give more meaningful diagnostics. But can
2119 // this substitution process actually fail?
2120 InstantiatingTemplate BuildingDeductionGuides(*this, Loc, Template);
2121 if (BuildingDeductionGuides.isInvalid())
7
Assuming the condition is false
8
Taking false branch
2122 return;
2123
2124 // Convert declared constructors into deduction guide templates.
2125 // FIXME: Skip constructors for which deduction must necessarily fail (those
2126 // for which some class template parameter without a default argument never
2127 // appears in a deduced context).
2128 bool AddedAny = false;
2129 for (NamedDecl *D : LookupConstructors(Transform.Primary)) {
2130 D = D->getUnderlyingDecl();
2131 if (D->isInvalidDecl() || D->isImplicit())
9
Assuming the condition is false
10
Assuming the condition is false
11
Taking false branch
2132 continue;
2133 D = cast<NamedDecl>(D->getCanonicalDecl());
12
The object is a 'NamedDecl'
2134
2135 auto *FTD = dyn_cast<FunctionTemplateDecl>(D);
13
Assuming 'D' is a 'FunctionTemplateDecl'
2136 auto *CD =
2137 dyn_cast_or_null<CXXConstructorDecl>(FTD
13.1
'FTD' is non-null
? FTD->getTemplatedDecl() : D)
;
14
'?' condition is true
15
Assuming the object is a 'CXXConstructorDecl'
2138 // Class-scope explicit specializations (MS extension) do not result in
2139 // deduction guides.
2140 if (!CD
15.1
'CD' is non-null
|| (!FTD
15.2
'FTD' is non-null
&& CD->isFunctionTemplateSpecialization()))
2141 continue;
2142
2143 Transform.transformConstructor(FTD, CD);
16
Calling 'ConvertConstructorToDeductionGuideTransform::transformConstructor'
2144 AddedAny = true;
2145 }
2146
2147 // C++17 [over.match.class.deduct]
2148 // -- If C is not defined or does not declare any constructors, an
2149 // additional function template derived as above from a hypothetical
2150 // constructor C().
2151 if (!AddedAny)
2152 Transform.buildSimpleDeductionGuide(None);
2153
2154 // -- An additional function template derived as above from a hypothetical
2155 // constructor C(C), called the copy deduction candidate.
2156 cast<CXXDeductionGuideDecl>(
2157 cast<FunctionTemplateDecl>(
2158 Transform.buildSimpleDeductionGuide(Transform.DeducedType))
2159 ->getTemplatedDecl())
2160 ->setIsCopyDeductionCandidate();
2161}
2162
2163/// Diagnose the presence of a default template argument on a
2164/// template parameter, which is ill-formed in certain contexts.
2165///
2166/// \returns true if the default template argument should be dropped.
2167static bool DiagnoseDefaultTemplateArgument(Sema &S,
2168 Sema::TemplateParamListContext TPC,
2169 SourceLocation ParamLoc,
2170 SourceRange DefArgRange) {
2171 switch (TPC) {
2172 case Sema::TPC_ClassTemplate:
2173 case Sema::TPC_VarTemplate:
2174 case Sema::TPC_TypeAliasTemplate:
2175 return false;
2176
2177 case Sema::TPC_FunctionTemplate:
2178 case Sema::TPC_FriendFunctionTemplateDefinition:
2179 // C++ [temp.param]p9:
2180 // A default template-argument shall not be specified in a
2181 // function template declaration or a function template
2182 // definition [...]
2183 // If a friend function template declaration specifies a default
2184 // template-argument, that declaration shall be a definition and shall be
2185 // the only declaration of the function template in the translation unit.
2186 // (C++98/03 doesn't have this wording; see DR226).
2187 S.Diag(ParamLoc, S.getLangOpts().CPlusPlus11 ?
2188 diag::warn_cxx98_compat_template_parameter_default_in_function_template
2189 : diag::ext_template_parameter_default_in_function_template)
2190 << DefArgRange;
2191 return false;
2192
2193 case Sema::TPC_ClassTemplateMember:
2194 // C++0x [temp.param]p9:
2195 // A default template-argument shall not be specified in the
2196 // template-parameter-lists of the definition of a member of a
2197 // class template that appears outside of the member's class.
2198 S.Diag(ParamLoc, diag::err_template_parameter_default_template_member)
2199 << DefArgRange;
2200 return true;
2201
2202 case Sema::TPC_FriendClassTemplate:
2203 case Sema::TPC_FriendFunctionTemplate:
2204 // C++ [temp.param]p9:
2205 // A default template-argument shall not be specified in a
2206 // friend template declaration.
2207 S.Diag(ParamLoc, diag::err_template_parameter_default_friend_template)
2208 << DefArgRange;
2209 return true;
2210
2211 // FIXME: C++0x [temp.param]p9 allows default template-arguments
2212 // for friend function templates if there is only a single
2213 // declaration (and it is a definition). Strange!
2214 }
2215
2216 llvm_unreachable("Invalid TemplateParamListContext!")::llvm::llvm_unreachable_internal("Invalid TemplateParamListContext!"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2216)
;
2217}
2218
2219/// Check for unexpanded parameter packs within the template parameters
2220/// of a template template parameter, recursively.
2221static bool DiagnoseUnexpandedParameterPacks(Sema &S,
2222 TemplateTemplateParmDecl *TTP) {
2223 // A template template parameter which is a parameter pack is also a pack
2224 // expansion.
2225 if (TTP->isParameterPack())
2226 return false;
2227
2228 TemplateParameterList *Params = TTP->getTemplateParameters();
2229 for (unsigned I = 0, N = Params->size(); I != N; ++I) {
2230 NamedDecl *P = Params->getParam(I);
2231 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
2232 if (!NTTP->isParameterPack() &&
2233 S.DiagnoseUnexpandedParameterPack(NTTP->getLocation(),
2234 NTTP->getTypeSourceInfo(),
2235 Sema::UPPC_NonTypeTemplateParameterType))
2236 return true;
2237
2238 continue;
2239 }
2240
2241 if (TemplateTemplateParmDecl *InnerTTP
2242 = dyn_cast<TemplateTemplateParmDecl>(P))
2243 if (DiagnoseUnexpandedParameterPacks(S, InnerTTP))
2244 return true;
2245 }
2246
2247 return false;
2248}
2249
2250/// Checks the validity of a template parameter list, possibly
2251/// considering the template parameter list from a previous
2252/// declaration.
2253///
2254/// If an "old" template parameter list is provided, it must be
2255/// equivalent (per TemplateParameterListsAreEqual) to the "new"
2256/// template parameter list.
2257///
2258/// \param NewParams Template parameter list for a new template
2259/// declaration. This template parameter list will be updated with any
2260/// default arguments that are carried through from the previous
2261/// template parameter list.
2262///
2263/// \param OldParams If provided, template parameter list from a
2264/// previous declaration of the same template. Default template
2265/// arguments will be merged from the old template parameter list to
2266/// the new template parameter list.
2267///
2268/// \param TPC Describes the context in which we are checking the given
2269/// template parameter list.
2270///
2271/// \param SkipBody If we might have already made a prior merged definition
2272/// of this template visible, the corresponding body-skipping information.
2273/// Default argument redefinition is not an error when skipping such a body,
2274/// because (under the ODR) we can assume the default arguments are the same
2275/// as the prior merged definition.
2276///
2277/// \returns true if an error occurred, false otherwise.
2278bool Sema::CheckTemplateParameterList(TemplateParameterList *NewParams,
2279 TemplateParameterList *OldParams,
2280 TemplateParamListContext TPC,
2281 SkipBodyInfo *SkipBody) {
2282 bool Invalid = false;
2283
2284 // C++ [temp.param]p10:
2285 // The set of default template-arguments available for use with a
2286 // template declaration or definition is obtained by merging the
2287 // default arguments from the definition (if in scope) and all
2288 // declarations in scope in the same way default function
2289 // arguments are (8.3.6).
2290 bool SawDefaultArgument = false;
2291 SourceLocation PreviousDefaultArgLoc;
2292
2293 // Dummy initialization to avoid warnings.
2294 TemplateParameterList::iterator OldParam = NewParams->end();
2295 if (OldParams)
2296 OldParam = OldParams->begin();
2297
2298 bool RemoveDefaultArguments = false;
2299 for (TemplateParameterList::iterator NewParam = NewParams->begin(),
2300 NewParamEnd = NewParams->end();
2301 NewParam != NewParamEnd; ++NewParam) {
2302 // Variables used to diagnose redundant default arguments
2303 bool RedundantDefaultArg = false;
2304 SourceLocation OldDefaultLoc;
2305 SourceLocation NewDefaultLoc;
2306
2307 // Variable used to diagnose missing default arguments
2308 bool MissingDefaultArg = false;
2309
2310 // Variable used to diagnose non-final parameter packs
2311 bool SawParameterPack = false;
2312
2313 if (TemplateTypeParmDecl *NewTypeParm
2314 = dyn_cast<TemplateTypeParmDecl>(*NewParam)) {
2315 // Check the presence of a default argument here.
2316 if (NewTypeParm->hasDefaultArgument() &&
2317 DiagnoseDefaultTemplateArgument(*this, TPC,
2318 NewTypeParm->getLocation(),
2319 NewTypeParm->getDefaultArgumentInfo()->getTypeLoc()
2320 .getSourceRange()))
2321 NewTypeParm->removeDefaultArgument();
2322
2323 // Merge default arguments for template type parameters.
2324 TemplateTypeParmDecl *OldTypeParm
2325 = OldParams? cast<TemplateTypeParmDecl>(*OldParam) : nullptr;
2326 if (NewTypeParm->isParameterPack()) {
2327 assert(!NewTypeParm->hasDefaultArgument() &&((!NewTypeParm->hasDefaultArgument() && "Parameter packs can't have a default argument!"
) ? static_cast<void> (0) : __assert_fail ("!NewTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2328, __PRETTY_FUNCTION__))
2328 "Parameter packs can't have a default argument!")((!NewTypeParm->hasDefaultArgument() && "Parameter packs can't have a default argument!"
) ? static_cast<void> (0) : __assert_fail ("!NewTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2328, __PRETTY_FUNCTION__))
;
2329 SawParameterPack = true;
2330 } else if (OldTypeParm && hasVisibleDefaultArgument(OldTypeParm) &&
2331 NewTypeParm->hasDefaultArgument() &&
2332 (!SkipBody || !SkipBody->ShouldSkip)) {
2333 OldDefaultLoc = OldTypeParm->getDefaultArgumentLoc();
2334 NewDefaultLoc = NewTypeParm->getDefaultArgumentLoc();
2335 SawDefaultArgument = true;
2336 RedundantDefaultArg = true;
2337 PreviousDefaultArgLoc = NewDefaultLoc;
2338 } else if (OldTypeParm && OldTypeParm->hasDefaultArgument()) {
2339 // Merge the default argument from the old declaration to the
2340 // new declaration.
2341 NewTypeParm->setInheritedDefaultArgument(Context, OldTypeParm);
2342 PreviousDefaultArgLoc = OldTypeParm->getDefaultArgumentLoc();
2343 } else if (NewTypeParm->hasDefaultArgument()) {
2344 SawDefaultArgument = true;
2345 PreviousDefaultArgLoc = NewTypeParm->getDefaultArgumentLoc();
2346 } else if (SawDefaultArgument)
2347 MissingDefaultArg = true;
2348 } else if (NonTypeTemplateParmDecl *NewNonTypeParm
2349 = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) {
2350 // Check for unexpanded parameter packs.
2351 if (!NewNonTypeParm->isParameterPack() &&
2352 DiagnoseUnexpandedParameterPack(NewNonTypeParm->getLocation(),
2353 NewNonTypeParm->getTypeSourceInfo(),
2354 UPPC_NonTypeTemplateParameterType)) {
2355 Invalid = true;
2356 continue;
2357 }
2358
2359 // Check the presence of a default argument here.
2360 if (NewNonTypeParm->hasDefaultArgument() &&
2361 DiagnoseDefaultTemplateArgument(*this, TPC,
2362 NewNonTypeParm->getLocation(),
2363 NewNonTypeParm->getDefaultArgument()->getSourceRange())) {
2364 NewNonTypeParm->removeDefaultArgument();
2365 }
2366
2367 // Merge default arguments for non-type template parameters
2368 NonTypeTemplateParmDecl *OldNonTypeParm
2369 = OldParams? cast<NonTypeTemplateParmDecl>(*OldParam) : nullptr;
2370 if (NewNonTypeParm->isParameterPack()) {
2371 assert(!NewNonTypeParm->hasDefaultArgument() &&((!NewNonTypeParm->hasDefaultArgument() && "Parameter packs can't have a default argument!"
) ? static_cast<void> (0) : __assert_fail ("!NewNonTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2372, __PRETTY_FUNCTION__))
2372 "Parameter packs can't have a default argument!")((!NewNonTypeParm->hasDefaultArgument() && "Parameter packs can't have a default argument!"
) ? static_cast<void> (0) : __assert_fail ("!NewNonTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2372, __PRETTY_FUNCTION__))
;
2373 if (!NewNonTypeParm->isPackExpansion())
2374 SawParameterPack = true;
2375 } else if (OldNonTypeParm && hasVisibleDefaultArgument(OldNonTypeParm) &&
2376 NewNonTypeParm->hasDefaultArgument() &&
2377 (!SkipBody || !SkipBody->ShouldSkip)) {
2378 OldDefaultLoc = OldNonTypeParm->getDefaultArgumentLoc();
2379 NewDefaultLoc = NewNonTypeParm->getDefaultArgumentLoc();
2380 SawDefaultArgument = true;
2381 RedundantDefaultArg = true;
2382 PreviousDefaultArgLoc = NewDefaultLoc;
2383 } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument()) {
2384 // Merge the default argument from the old declaration to the
2385 // new declaration.
2386 NewNonTypeParm->setInheritedDefaultArgument(Context, OldNonTypeParm);
2387 PreviousDefaultArgLoc = OldNonTypeParm->getDefaultArgumentLoc();
2388 } else if (NewNonTypeParm->hasDefaultArgument()) {
2389 SawDefaultArgument = true;
2390 PreviousDefaultArgLoc = NewNonTypeParm->getDefaultArgumentLoc();
2391 } else if (SawDefaultArgument)
2392 MissingDefaultArg = true;
2393 } else {
2394 TemplateTemplateParmDecl *NewTemplateParm
2395 = cast<TemplateTemplateParmDecl>(*NewParam);
2396
2397 // Check for unexpanded parameter packs, recursively.
2398 if (::DiagnoseUnexpandedParameterPacks(*this, NewTemplateParm)) {
2399 Invalid = true;
2400 continue;
2401 }
2402
2403 // Check the presence of a default argument here.
2404 if (NewTemplateParm->hasDefaultArgument() &&
2405 DiagnoseDefaultTemplateArgument(*this, TPC,
2406 NewTemplateParm->getLocation(),
2407 NewTemplateParm->getDefaultArgument().getSourceRange()))
2408 NewTemplateParm->removeDefaultArgument();
2409
2410 // Merge default arguments for template template parameters
2411 TemplateTemplateParmDecl *OldTemplateParm
2412 = OldParams? cast<TemplateTemplateParmDecl>(*OldParam) : nullptr;
2413 if (NewTemplateParm->isParameterPack()) {
2414 assert(!NewTemplateParm->hasDefaultArgument() &&((!NewTemplateParm->hasDefaultArgument() && "Parameter packs can't have a default argument!"
) ? static_cast<void> (0) : __assert_fail ("!NewTemplateParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2415, __PRETTY_FUNCTION__))
2415 "Parameter packs can't have a default argument!")((!NewTemplateParm->hasDefaultArgument() && "Parameter packs can't have a default argument!"
) ? static_cast<void> (0) : __assert_fail ("!NewTemplateParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 2415, __PRETTY_FUNCTION__))
;
2416 if (!NewTemplateParm->isPackExpansion())
2417 SawParameterPack = true;
2418 } else if (OldTemplateParm &&
2419 hasVisibleDefaultArgument(OldTemplateParm) &&
2420 NewTemplateParm->hasDefaultArgument() &&
2421 (!SkipBody || !SkipBody->ShouldSkip)) {
2422 OldDefaultLoc = OldTemplateParm->getDefaultArgument().getLocation();
2423 NewDefaultLoc = NewTemplateParm->getDefaultArgument().getLocation();
2424 SawDefaultArgument = true;
2425 RedundantDefaultArg = true;
2426 PreviousDefaultArgLoc = NewDefaultLoc;
2427 } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument()) {
2428 // Merge the default argument from the old declaration to the
2429 // new declaration.
2430 NewTemplateParm->setInheritedDefaultArgument(Context, OldTemplateParm);
2431 PreviousDefaultArgLoc
2432 = OldTemplateParm->getDefaultArgument().getLocation();
2433 } else if (NewTemplateParm->hasDefaultArgument()) {
2434 SawDefaultArgument = true;
2435 PreviousDefaultArgLoc
2436 = NewTemplateParm->getDefaultArgument().getLocation();
2437 } else if (SawDefaultArgument)
2438 MissingDefaultArg = true;
2439 }
2440
2441 // C++11 [temp.param]p11:
2442 // If a template parameter of a primary class template or alias template
2443 // is a template parameter pack, it shall be the last template parameter.
2444 if (SawParameterPack && (NewParam + 1) != NewParamEnd &&
2445 (TPC == TPC_ClassTemplate || TPC == TPC_VarTemplate ||
2446 TPC == TPC_TypeAliasTemplate)) {
2447 Diag((*NewParam)->getLocation(),
2448 diag::err_template_param_pack_must_be_last_template_parameter);
2449 Invalid = true;
2450 }
2451
2452 if (RedundantDefaultArg) {
2453 // C++ [temp.param]p12:
2454 // A template-parameter shall not be given default arguments
2455 // by two different declarations in the same scope.
2456 Diag(NewDefaultLoc, diag::err_template_param_default_arg_redefinition);
2457 Diag(OldDefaultLoc, diag::note_template_param_prev_default_arg);
2458 Invalid = true;
2459 } else if (MissingDefaultArg && TPC != TPC_FunctionTemplate) {
2460 // C++ [temp.param]p11:
2461 // If a template-parameter of a class template has a default
2462 // template-argument, each subsequent template-parameter shall either
2463 // have a default template-argument supplied or be a template parameter
2464 // pack.
2465 Diag((*NewParam)->getLocation(),
2466 diag::err_template_param_default_arg_missing);
2467 Diag(PreviousDefaultArgLoc, diag::note_template_param_prev_default_arg);
2468 Invalid = true;
2469 RemoveDefaultArguments = true;
2470 }
2471
2472 // If we have an old template parameter list that we're merging
2473 // in, move on to the next parameter.
2474 if (OldParams)
2475 ++OldParam;
2476 }
2477
2478 // We were missing some default arguments at the end of the list, so remove
2479 // all of the default arguments.
2480 if (RemoveDefaultArguments) {
2481 for (TemplateParameterList::iterator NewParam = NewParams->begin(),
2482 NewParamEnd = NewParams->end();
2483 NewParam != NewParamEnd; ++NewParam) {
2484 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*NewParam))
2485 TTP->removeDefaultArgument();
2486 else if (NonTypeTemplateParmDecl *NTTP
2487 = dyn_cast<NonTypeTemplateParmDecl>(*NewParam))
2488 NTTP->removeDefaultArgument();
2489 else
2490 cast<TemplateTemplateParmDecl>(*NewParam)->removeDefaultArgument();
2491 }
2492 }
2493
2494 return Invalid;
2495}
2496
2497namespace {
2498
2499/// A class which looks for a use of a certain level of template
2500/// parameter.
2501struct DependencyChecker : RecursiveASTVisitor<DependencyChecker> {
2502 typedef RecursiveASTVisitor<DependencyChecker> super;
2503
2504 unsigned Depth;
2505
2506 // Whether we're looking for a use of a template parameter that makes the
2507 // overall construct type-dependent / a dependent type. This is strictly
2508 // best-effort for now; we may fail to match at all for a dependent type
2509 // in some cases if this is set.
2510 bool IgnoreNonTypeDependent;
2511
2512 bool Match;
2513 SourceLocation MatchLoc;
2514
2515 DependencyChecker(unsigned Depth, bool IgnoreNonTypeDependent)
2516 : Depth(Depth), IgnoreNonTypeDependent(IgnoreNonTypeDependent),
2517 Match(false) {}
2518
2519 DependencyChecker(TemplateParameterList *Params, bool IgnoreNonTypeDependent)
2520 : IgnoreNonTypeDependent(IgnoreNonTypeDependent), Match(false) {
2521 NamedDecl *ND = Params->getParam(0);
2522 if (TemplateTypeParmDecl *PD = dyn_cast<TemplateTypeParmDecl>(ND)) {
2523 Depth = PD->getDepth();
2524 } else if (NonTypeTemplateParmDecl *PD =
2525 dyn_cast<NonTypeTemplateParmDecl>(ND)) {
2526 Depth = PD->getDepth();
2527 } else {
2528 Depth = cast<TemplateTemplateParmDecl>(ND)->getDepth();
2529 }
2530 }
2531
2532 bool Matches(unsigned ParmDepth, SourceLocation Loc = SourceLocation()) {
2533 if (ParmDepth >= Depth) {
2534 Match = true;
2535 MatchLoc = Loc;
2536 return true;
2537 }
2538 return false;
2539 }
2540
2541 bool TraverseStmt(Stmt *S, DataRecursionQueue *Q = nullptr) {
2542 // Prune out non-type-dependent expressions if requested. This can
2543 // sometimes result in us failing to find a template parameter reference
2544 // (if a value-dependent expression creates a dependent type), but this
2545 // mode is best-effort only.
2546 if (auto *E = dyn_cast_or_null<Expr>(S))
2547 if (IgnoreNonTypeDependent && !E->isTypeDependent())
2548 return true;
2549 return super::TraverseStmt(S, Q);
2550 }
2551
2552 bool TraverseTypeLoc(TypeLoc TL) {
2553 if (IgnoreNonTypeDependent && !TL.isNull() &&
2554 !TL.getType()->isDependentType())
2555 return true;
2556 return super::TraverseTypeLoc(TL);
2557 }
2558
2559 bool VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL) {
2560 return !Matches(TL.getTypePtr()->getDepth(), TL.getNameLoc());
2561 }
2562
2563 bool VisitTemplateTypeParmType(const TemplateTypeParmType *T) {
2564 // For a best-effort search, keep looking until we find a location.
2565 return IgnoreNonTypeDependent || !Matches(T->getDepth());
2566 }
2567
2568 bool TraverseTemplateName(TemplateName N) {
2569 if (TemplateTemplateParmDecl *PD =
2570 dyn_cast_or_null<TemplateTemplateParmDecl>(N.getAsTemplateDecl()))
2571 if (Matches(PD->getDepth()))
2572 return false;
2573 return super::TraverseTemplateName(N);
2574 }
2575
2576 bool VisitDeclRefExpr(DeclRefExpr *E) {
2577 if (NonTypeTemplateParmDecl *PD =
2578 dyn_cast<NonTypeTemplateParmDecl>(E->getDecl()))
2579 if (Matches(PD->getDepth(), E->getExprLoc()))
2580 return false;
2581 return super::VisitDeclRefExpr(E);
2582 }
2583
2584 bool VisitSubstTemplateTypeParmType(const SubstTemplateTypeParmType *T) {
2585 return TraverseType(T->getReplacementType());
2586 }
2587
2588 bool
2589 VisitSubstTemplateTypeParmPackType(const SubstTemplateTypeParmPackType *T) {
2590 return TraverseTemplateArgument(T->getArgumentPack());
2591 }
2592
2593 bool TraverseInjectedClassNameType(const InjectedClassNameType *T) {
2594 return TraverseType(T->getInjectedSpecializationType());
2595 }
2596};
2597} // end anonymous namespace
2598
2599/// Determines whether a given type depends on the given parameter
2600/// list.
2601static bool
2602DependsOnTemplateParameters(QualType T, TemplateParameterList *Params) {
2603 DependencyChecker Checker(Params, /*IgnoreNonTypeDependent*/false);
2604 Checker.TraverseType(T);
2605 return Checker.Match;
2606}
2607
2608// Find the source range corresponding to the named type in the given
2609// nested-name-specifier, if any.
2610static SourceRange getRangeOfTypeInNestedNameSpecifier(ASTContext &Context,
2611 QualType T,
2612 const CXXScopeSpec &SS) {
2613 NestedNameSpecifierLoc NNSLoc(SS.getScopeRep(), SS.location_data());
2614 while (NestedNameSpecifier *NNS = NNSLoc.getNestedNameSpecifier()) {
2615 if (const Type *CurType = NNS->getAsType()) {
2616 if (Context.hasSameUnqualifiedType(T, QualType(CurType, 0)))
2617 return NNSLoc.getTypeLoc().getSourceRange();
2618 } else
2619 break;
2620
2621 NNSLoc = NNSLoc.getPrefix();
2622 }
2623
2624 return SourceRange();
2625}
2626
2627/// Match the given template parameter lists to the given scope
2628/// specifier, returning the template parameter list that applies to the
2629/// name.
2630///
2631/// \param DeclStartLoc the start of the declaration that has a scope
2632/// specifier or a template parameter list.
2633///
2634/// \param DeclLoc The location of the declaration itself.
2635///
2636/// \param SS the scope specifier that will be matched to the given template
2637/// parameter lists. This scope specifier precedes a qualified name that is
2638/// being declared.
2639///
2640/// \param TemplateId The template-id following the scope specifier, if there
2641/// is one. Used to check for a missing 'template<>'.
2642///
2643/// \param ParamLists the template parameter lists, from the outermost to the
2644/// innermost template parameter lists.
2645///
2646/// \param IsFriend Whether to apply the slightly different rules for
2647/// matching template parameters to scope specifiers in friend
2648/// declarations.
2649///
2650/// \param IsMemberSpecialization will be set true if the scope specifier
2651/// denotes a fully-specialized type, and therefore this is a declaration of
2652/// a member specialization.
2653///
2654/// \returns the template parameter list, if any, that corresponds to the
2655/// name that is preceded by the scope specifier @p SS. This template
2656/// parameter list may have template parameters (if we're declaring a
2657/// template) or may have no template parameters (if we're declaring a
2658/// template specialization), or may be NULL (if what we're declaring isn't
2659/// itself a template).
2660TemplateParameterList *Sema::MatchTemplateParametersToScopeSpecifier(
2661 SourceLocation DeclStartLoc, SourceLocation DeclLoc, const CXXScopeSpec &SS,
2662 TemplateIdAnnotation *TemplateId,
2663 ArrayRef<TemplateParameterList *> ParamLists, bool IsFriend,
2664 bool &IsMemberSpecialization, bool &Invalid) {
2665 IsMemberSpecialization = false;
2666 Invalid = false;
2667
2668 // The sequence of nested types to which we will match up the template
2669 // parameter lists. We first build this list by starting with the type named
2670 // by the nested-name-specifier and walking out until we run out of types.
2671 SmallVector<QualType, 4> NestedTypes;
2672 QualType T;
2673 if (SS.getScopeRep()) {
2674 if (CXXRecordDecl *Record
2675 = dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS, true)))
2676 T = Context.getTypeDeclType(Record);
2677 else
2678 T = QualType(SS.getScopeRep()->getAsType(), 0);
2679 }
2680
2681 // If we found an explicit specialization that prevents us from needing
2682 // 'template<>' headers, this will be set to the location of that
2683 // explicit specialization.
2684 SourceLocation ExplicitSpecLoc;
2685
2686 while (!T.isNull()) {
2687 NestedTypes.push_back(T);
2688
2689 // Retrieve the parent of a record type.
2690 if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) {
2691 // If this type is an explicit specialization, we're done.
2692 if (ClassTemplateSpecializationDecl *Spec
2693 = dyn_cast<ClassTemplateSpecializationDecl>(Record)) {
2694 if (!isa<ClassTemplatePartialSpecializationDecl>(Spec) &&
2695 Spec->getSpecializationKind() == TSK_ExplicitSpecialization) {
2696 ExplicitSpecLoc = Spec->getLocation();
2697 break;
2698 }
2699 } else if (Record->getTemplateSpecializationKind()
2700 == TSK_ExplicitSpecialization) {
2701 ExplicitSpecLoc = Record->getLocation();
2702 break;
2703 }
2704
2705 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Record->getParent()))
2706 T = Context.getTypeDeclType(Parent);
2707 else
2708 T = QualType();
2709 continue;
2710 }
2711
2712 if (const TemplateSpecializationType *TST
2713 = T->getAs<TemplateSpecializationType>()) {
2714 if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) {
2715 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Template->getDeclContext()))
2716 T = Context.getTypeDeclType(Parent);
2717 else
2718 T = QualType();
2719 continue;
2720 }
2721 }
2722
2723 // Look one step prior in a dependent template specialization type.
2724 if (const DependentTemplateSpecializationType *DependentTST
2725 = T->getAs<DependentTemplateSpecializationType>()) {
2726 if (NestedNameSpecifier *NNS = DependentTST->getQualifier())
2727 T = QualType(NNS->getAsType(), 0);
2728 else
2729 T = QualType();
2730 continue;
2731 }
2732
2733 // Look one step prior in a dependent name type.
2734 if (const DependentNameType *DependentName = T->getAs<DependentNameType>()){
2735 if (NestedNameSpecifier *NNS = DependentName->getQualifier())
2736 T = QualType(NNS->getAsType(), 0);
2737 else
2738 T = QualType();
2739 continue;
2740 }
2741
2742 // Retrieve the parent of an enumeration type.
2743 if (const EnumType *EnumT = T->getAs<EnumType>()) {
2744 // FIXME: Forward-declared enums require a TSK_ExplicitSpecialization
2745 // check here.
2746 EnumDecl *Enum = EnumT->getDecl();
2747
2748 // Get to the parent type.
2749 if (TypeDecl *Parent = dyn_cast<TypeDecl>(Enum->getParent()))
2750 T = Context.getTypeDeclType(Parent);
2751 else
2752 T = QualType();
2753 continue;
2754 }
2755
2756 T = QualType();
2757 }
2758 // Reverse the nested types list, since we want to traverse from the outermost
2759 // to the innermost while checking template-parameter-lists.
2760 std::reverse(NestedTypes.begin(), NestedTypes.end());
2761
2762 // C++0x [temp.expl.spec]p17:
2763 // A member or a member template may be nested within many
2764 // enclosing class templates. In an explicit specialization for
2765 // such a member, the member declaration shall be preceded by a
2766 // template<> for each enclosing class template that is
2767 // explicitly specialized.
2768 bool SawNonEmptyTemplateParameterList = false;
2769
2770 auto CheckExplicitSpecialization = [&](SourceRange Range, bool Recovery) {
2771 if (SawNonEmptyTemplateParameterList) {
2772 Diag(DeclLoc, diag::err_specialize_member_of_template)
2773 << !Recovery << Range;
2774 Invalid = true;
2775 IsMemberSpecialization = false;
2776 return true;
2777 }
2778
2779 return false;
2780 };
2781
2782 auto DiagnoseMissingExplicitSpecialization = [&] (SourceRange Range) {
2783 // Check that we can have an explicit specialization here.
2784 if (CheckExplicitSpecialization(Range, true))
2785 return true;
2786
2787 // We don't have a template header, but we should.
2788 SourceLocation ExpectedTemplateLoc;
2789 if (!ParamLists.empty())
2790 ExpectedTemplateLoc = ParamLists[0]->getTemplateLoc();
2791 else
2792 ExpectedTemplateLoc = DeclStartLoc;
2793
2794 Diag(DeclLoc, diag::err_template_spec_needs_header)
2795 << Range
2796 << FixItHint::CreateInsertion(ExpectedTemplateLoc, "template<> ");
2797 return false;
2798 };
2799
2800 unsigned ParamIdx = 0;
2801 for (unsigned TypeIdx = 0, NumTypes = NestedTypes.size(); TypeIdx != NumTypes;
2802 ++TypeIdx) {
2803 T = NestedTypes[TypeIdx];
2804
2805 // Whether we expect a 'template<>' header.
2806 bool NeedEmptyTemplateHeader = false;
2807
2808 // Whether we expect a template header with parameters.
2809 bool NeedNonemptyTemplateHeader = false;
2810
2811 // For a dependent type, the set of template parameters that we
2812 // expect to see.
2813 TemplateParameterList *ExpectedTemplateParams = nullptr;
2814
2815 // C++0x [temp.expl.spec]p15:
2816 // A member or a member template may be nested within many enclosing
2817 // class templates. In an explicit specialization for such a member, the
2818 // member declaration shall be preceded by a template<> for each
2819 // enclosing class template that is explicitly specialized.
2820 if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) {
2821 if (ClassTemplatePartialSpecializationDecl *Partial
2822 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) {
2823 ExpectedTemplateParams = Partial->getTemplateParameters();
2824 NeedNonemptyTemplateHeader = true;
2825 } else if (Record->isDependentType()) {
2826 if (Record->getDescribedClassTemplate()) {
2827 ExpectedTemplateParams = Record->getDescribedClassTemplate()
2828 ->getTemplateParameters();
2829 NeedNonemptyTemplateHeader = true;
2830 }
2831 } else if (ClassTemplateSpecializationDecl *Spec
2832 = dyn_cast<ClassTemplateSpecializationDecl>(Record)) {
2833 // C++0x [temp.expl.spec]p4:
2834 // Members of an explicitly specialized class template are defined
2835 // in the same manner as members of normal classes, and not using
2836 // the template<> syntax.
2837 if (Spec->getSpecializationKind() != TSK_ExplicitSpecialization)
2838 NeedEmptyTemplateHeader = true;
2839 else
2840 continue;
2841 } else if (Record->getTemplateSpecializationKind()) {
2842 if (Record->getTemplateSpecializationKind()
2843 != TSK_ExplicitSpecialization &&
2844 TypeIdx == NumTypes - 1)
2845 IsMemberSpecialization = true;
2846
2847 continue;
2848 }
2849 } else if (const TemplateSpecializationType *TST
2850 = T->getAs<TemplateSpecializationType>()) {
2851 if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) {
2852 ExpectedTemplateParams = Template->getTemplateParameters();
2853 NeedNonemptyTemplateHeader = true;
2854 }
2855 } else if (T->getAs<DependentTemplateSpecializationType>()) {
2856 // FIXME: We actually could/should check the template arguments here
2857 // against the corresponding template parameter list.
2858 NeedNonemptyTemplateHeader = false;
2859 }
2860
2861 // C++ [temp.expl.spec]p16:
2862 // In an explicit specialization declaration for a member of a class
2863 // template or a member template that ap- pears in namespace scope, the
2864 // member template and some of its enclosing class templates may remain
2865 // unspecialized, except that the declaration shall not explicitly
2866 // specialize a class member template if its en- closing class templates
2867 // are not explicitly specialized as well.
2868 if (ParamIdx < ParamLists.size()) {
2869 if (ParamLists[ParamIdx]->size() == 0) {
2870 if (CheckExplicitSpecialization(ParamLists[ParamIdx]->getSourceRange(),
2871 false))
2872 return nullptr;
2873 } else
2874 SawNonEmptyTemplateParameterList = true;
2875 }
2876
2877 if (NeedEmptyTemplateHeader) {
2878 // If we're on the last of the types, and we need a 'template<>' header
2879 // here, then it's a member specialization.
2880 if (TypeIdx == NumTypes - 1)
2881 IsMemberSpecialization = true;
2882
2883 if (ParamIdx < ParamLists.size()) {
2884 if (ParamLists[ParamIdx]->size() > 0) {
2885 // The header has template parameters when it shouldn't. Complain.
2886 Diag(ParamLists[ParamIdx]->getTemplateLoc(),
2887 diag::err_template_param_list_matches_nontemplate)
2888 << T
2889 << SourceRange(ParamLists[ParamIdx]->getLAngleLoc(),
2890 ParamLists[ParamIdx]->getRAngleLoc())
2891 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS);
2892 Invalid = true;
2893 return nullptr;
2894 }
2895
2896 // Consume this template header.
2897 ++ParamIdx;
2898 continue;
2899 }
2900
2901 if (!IsFriend)
2902 if (DiagnoseMissingExplicitSpecialization(
2903 getRangeOfTypeInNestedNameSpecifier(Context, T, SS)))
2904 return nullptr;
2905
2906 continue;
2907 }
2908
2909 if (NeedNonemptyTemplateHeader) {
2910 // In friend declarations we can have template-ids which don't
2911 // depend on the corresponding template parameter lists. But
2912 // assume that empty parameter lists are supposed to match this
2913 // template-id.
2914 if (IsFriend && T->isDependentType()) {
2915 if (ParamIdx < ParamLists.size() &&
2916 DependsOnTemplateParameters(T, ParamLists[ParamIdx]))
2917 ExpectedTemplateParams = nullptr;
2918 else
2919 continue;
2920 }
2921
2922 if (ParamIdx < ParamLists.size()) {
2923 // Check the template parameter list, if we can.
2924 if (ExpectedTemplateParams &&
2925 !TemplateParameterListsAreEqual(ParamLists[ParamIdx],
2926 ExpectedTemplateParams,
2927 true, TPL_TemplateMatch))
2928 Invalid = true;
2929
2930 if (!Invalid &&
2931 CheckTemplateParameterList(ParamLists[ParamIdx], nullptr,
2932 TPC_ClassTemplateMember))
2933 Invalid = true;
2934
2935 ++ParamIdx;
2936 continue;
2937 }
2938
2939 Diag(DeclLoc, diag::err_template_spec_needs_template_parameters)
2940 << T
2941 << getRangeOfTypeInNestedNameSpecifier(Context, T, SS);
2942 Invalid = true;
2943 continue;
2944 }
2945 }
2946
2947 // If there were at least as many template-ids as there were template
2948 // parameter lists, then there are no template parameter lists remaining for
2949 // the declaration itself.
2950 if (ParamIdx >= ParamLists.size()) {
2951 if (TemplateId && !IsFriend) {
2952 // We don't have a template header for the declaration itself, but we
2953 // should.
2954 DiagnoseMissingExplicitSpecialization(SourceRange(TemplateId->LAngleLoc,
2955 TemplateId->RAngleLoc));
2956
2957 // Fabricate an empty template parameter list for the invented header.
2958 return TemplateParameterList::Create(Context, SourceLocation(),
2959 SourceLocation(), None,
2960 SourceLocation(), nullptr);
2961 }
2962
2963 return nullptr;
2964 }
2965
2966 // If there were too many template parameter lists, complain about that now.
2967 if (ParamIdx < ParamLists.size() - 1) {
2968 bool HasAnyExplicitSpecHeader = false;
2969 bool AllExplicitSpecHeaders = true;
2970 for (unsigned I = ParamIdx, E = ParamLists.size() - 1; I != E; ++I) {
2971 if (ParamLists[I]->size() == 0)
2972 HasAnyExplicitSpecHeader = true;
2973 else
2974 AllExplicitSpecHeaders = false;
2975 }
2976
2977 Diag(ParamLists[ParamIdx]->getTemplateLoc(),
2978 AllExplicitSpecHeaders ? diag::warn_template_spec_extra_headers
2979 : diag::err_template_spec_extra_headers)
2980 << SourceRange(ParamLists[ParamIdx]->getTemplateLoc(),
2981 ParamLists[ParamLists.size() - 2]->getRAngleLoc());
2982
2983 // If there was a specialization somewhere, such that 'template<>' is
2984 // not required, and there were any 'template<>' headers, note where the
2985 // specialization occurred.
2986 if (ExplicitSpecLoc.isValid() && HasAnyExplicitSpecHeader)
2987 Diag(ExplicitSpecLoc,
2988 diag::note_explicit_template_spec_does_not_need_header)
2989 << NestedTypes.back();
2990
2991 // We have a template parameter list with no corresponding scope, which
2992 // means that the resulting template declaration can't be instantiated
2993 // properly (we'll end up with dependent nodes when we shouldn't).
2994 if (!AllExplicitSpecHeaders)
2995 Invalid = true;
2996 }
2997
2998 // C++ [temp.expl.spec]p16:
2999 // In an explicit specialization declaration for a member of a class
3000 // template or a member template that ap- pears in namespace scope, the
3001 // member template and some of its enclosing class templates may remain
3002 // unspecialized, except that the declaration shall not explicitly
3003 // specialize a class member template if its en- closing class templates
3004 // are not explicitly specialized as well.
3005 if (ParamLists.back()->size() == 0 &&
3006 CheckExplicitSpecialization(ParamLists[ParamIdx]->getSourceRange(),
3007 false))
3008 return nullptr;
3009
3010 // Return the last template parameter list, which corresponds to the
3011 // entity being declared.
3012 return ParamLists.back();
3013}
3014
3015void Sema::NoteAllFoundTemplates(TemplateName Name) {
3016 if (TemplateDecl *Template = Name.getAsTemplateDecl()) {
3017 Diag(Template->getLocation(), diag::note_template_declared_here)
3018 << (isa<FunctionTemplateDecl>(Template)
3019 ? 0
3020 : isa<ClassTemplateDecl>(Template)
3021 ? 1
3022 : isa<VarTemplateDecl>(Template)
3023 ? 2
3024 : isa<TypeAliasTemplateDecl>(Template) ? 3 : 4)
3025 << Template->getDeclName();
3026 return;
3027 }
3028
3029 if (OverloadedTemplateStorage *OST = Name.getAsOverloadedTemplate()) {
3030 for (OverloadedTemplateStorage::iterator I = OST->begin(),
3031 IEnd = OST->end();
3032 I != IEnd; ++I)
3033 Diag((*I)->getLocation(), diag::note_template_declared_here)
3034 << 0 << (*I)->getDeclName();
3035
3036 return;
3037 }
3038}
3039
3040static QualType
3041checkBuiltinTemplateIdType(Sema &SemaRef, BuiltinTemplateDecl *BTD,
3042 const SmallVectorImpl<TemplateArgument> &Converted,
3043 SourceLocation TemplateLoc,
3044 TemplateArgumentListInfo &TemplateArgs) {
3045 ASTContext &Context = SemaRef.getASTContext();
3046 switch (BTD->getBuiltinTemplateKind()) {
3047 case BTK__make_integer_seq: {
3048 // Specializations of __make_integer_seq<S, T, N> are treated like
3049 // S<T, 0, ..., N-1>.
3050
3051 // C++14 [inteseq.intseq]p1:
3052 // T shall be an integer type.
3053 if (!Converted[1].getAsType()->isIntegralType(Context)) {
3054 SemaRef.Diag(TemplateArgs[1].getLocation(),
3055 diag::err_integer_sequence_integral_element_type);
3056 return QualType();
3057 }
3058
3059 // C++14 [inteseq.make]p1:
3060 // If N is negative the program is ill-formed.
3061 TemplateArgument NumArgsArg = Converted[2];
3062 llvm::APSInt NumArgs = NumArgsArg.getAsIntegral();
3063 if (NumArgs < 0) {
3064 SemaRef.Diag(TemplateArgs[2].getLocation(),
3065 diag::err_integer_sequence_negative_length);
3066 return QualType();
3067 }
3068
3069 QualType ArgTy = NumArgsArg.getIntegralType();
3070 TemplateArgumentListInfo SyntheticTemplateArgs;
3071 // The type argument gets reused as the first template argument in the
3072 // synthetic template argument list.
3073 SyntheticTemplateArgs.addArgument(TemplateArgs[1]);
3074 // Expand N into 0 ... N-1.
3075 for (llvm::APSInt I(NumArgs.getBitWidth(), NumArgs.isUnsigned());
3076 I < NumArgs; ++I) {
3077 TemplateArgument TA(Context, I, ArgTy);
3078 SyntheticTemplateArgs.addArgument(SemaRef.getTrivialTemplateArgumentLoc(
3079 TA, ArgTy, TemplateArgs[2].getLocation()));
3080 }
3081 // The first template argument will be reused as the template decl that
3082 // our synthetic template arguments will be applied to.
3083 return SemaRef.CheckTemplateIdType(Converted[0].getAsTemplate(),
3084 TemplateLoc, SyntheticTemplateArgs);
3085 }
3086
3087 case BTK__type_pack_element:
3088 // Specializations of
3089 // __type_pack_element<Index, T_1, ..., T_N>
3090 // are treated like T_Index.
3091 assert(Converted.size() == 2 &&((Converted.size() == 2 && "__type_pack_element should be given an index and a parameter pack"
) ? static_cast<void> (0) : __assert_fail ("Converted.size() == 2 && \"__type_pack_element should be given an index and a parameter pack\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3092, __PRETTY_FUNCTION__))
3092 "__type_pack_element should be given an index and a parameter pack")((Converted.size() == 2 && "__type_pack_element should be given an index and a parameter pack"
) ? static_cast<void> (0) : __assert_fail ("Converted.size() == 2 && \"__type_pack_element should be given an index and a parameter pack\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3092, __PRETTY_FUNCTION__))
;
3093
3094 // If the Index is out of bounds, the program is ill-formed.
3095 TemplateArgument IndexArg = Converted[0], Ts = Converted[1];
3096 llvm::APSInt Index = IndexArg.getAsIntegral();
3097 assert(Index >= 0 && "the index used with __type_pack_element should be of "((Index >= 0 && "the index used with __type_pack_element should be of "
"type std::size_t, and hence be non-negative") ? static_cast
<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-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3098, __PRETTY_FUNCTION__))
3098 "type std::size_t, and hence be non-negative")((Index >= 0 && "the index used with __type_pack_element should be of "
"type std::size_t, and hence be non-negative") ? static_cast
<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-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3098, __PRETTY_FUNCTION__))
;
3099 if (Index >= Ts.pack_size()) {
3100 SemaRef.Diag(TemplateArgs[0].getLocation(),
3101 diag::err_type_pack_element_out_of_bounds);
3102 return QualType();
3103 }
3104
3105 // We simply return the type at index `Index`.
3106 auto Nth = std::next(Ts.pack_begin(), Index.getExtValue());
3107 return Nth->getAsType();
3108 }
3109 llvm_unreachable("unexpected BuiltinTemplateDecl!")::llvm::llvm_unreachable_internal("unexpected BuiltinTemplateDecl!"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3109)
;
3110}
3111
3112/// Determine whether this alias template is "enable_if_t".
3113static bool isEnableIfAliasTemplate(TypeAliasTemplateDecl *AliasTemplate) {
3114 return AliasTemplate->getName().equals("enable_if_t");
3115}
3116
3117/// Collect all of the separable terms in the given condition, which
3118/// might be a conjunction.
3119///
3120/// FIXME: The right answer is to convert the logical expression into
3121/// disjunctive normal form, so we can find the first failed term
3122/// within each possible clause.
3123static void collectConjunctionTerms(Expr *Clause,
3124 SmallVectorImpl<Expr *> &Terms) {
3125 if (auto BinOp = dyn_cast<BinaryOperator>(Clause->IgnoreParenImpCasts())) {
3126 if (BinOp->getOpcode() == BO_LAnd) {
3127 collectConjunctionTerms(BinOp->getLHS(), Terms);
3128 collectConjunctionTerms(BinOp->getRHS(), Terms);
3129 }
3130
3131 return;
3132 }
3133
3134 Terms.push_back(Clause);
3135}
3136
3137// The ranges-v3 library uses an odd pattern of a top-level "||" with
3138// a left-hand side that is value-dependent but never true. Identify
3139// the idiom and ignore that term.
3140static Expr *lookThroughRangesV3Condition(Preprocessor &PP, Expr *Cond) {
3141 // Top-level '||'.
3142 auto *BinOp = dyn_cast<BinaryOperator>(Cond->IgnoreParenImpCasts());
3143 if (!BinOp) return Cond;
3144
3145 if (BinOp->getOpcode() != BO_LOr) return Cond;
3146
3147 // With an inner '==' that has a literal on the right-hand side.
3148 Expr *LHS = BinOp->getLHS();
3149 auto *InnerBinOp = dyn_cast<BinaryOperator>(LHS->IgnoreParenImpCasts());
3150 if (!InnerBinOp) return Cond;
3151
3152 if (InnerBinOp->getOpcode() != BO_EQ ||
3153 !isa<IntegerLiteral>(InnerBinOp->getRHS()))
3154 return Cond;
3155
3156 // If the inner binary operation came from a macro expansion named
3157 // CONCEPT_REQUIRES or CONCEPT_REQUIRES_, return the right-hand side
3158 // of the '||', which is the real, user-provided condition.
3159 SourceLocation Loc = InnerBinOp->getExprLoc();
3160 if (!Loc.isMacroID()) return Cond;
3161
3162 StringRef MacroName = PP.getImmediateMacroName(Loc);
3163 if (MacroName == "CONCEPT_REQUIRES" || MacroName == "CONCEPT_REQUIRES_")
3164 return BinOp->getRHS();
3165
3166 return Cond;
3167}
3168
3169namespace {
3170
3171// A PrinterHelper that prints more helpful diagnostics for some sub-expressions
3172// within failing boolean expression, such as substituting template parameters
3173// for actual types.
3174class FailedBooleanConditionPrinterHelper : public PrinterHelper {
3175public:
3176 explicit FailedBooleanConditionPrinterHelper(const PrintingPolicy &P)
3177 : Policy(P) {}
3178
3179 bool handledStmt(Stmt *E, raw_ostream &OS) override {
3180 const auto *DR = dyn_cast<DeclRefExpr>(E);
3181 if (DR && DR->getQualifier()) {
3182 // If this is a qualified name, expand the template arguments in nested
3183 // qualifiers.
3184 DR->getQualifier()->print(OS, Policy, true);
3185 // Then print the decl itself.
3186 const ValueDecl *VD = DR->getDecl();
3187 OS << VD->getName();
3188 if (const auto *IV = dyn_cast<VarTemplateSpecializationDecl>(VD)) {
3189 // This is a template variable, print the expanded template arguments.
3190 printTemplateArgumentList(OS, IV->getTemplateArgs().asArray(), Policy);
3191 }
3192 return true;
3193 }
3194 return false;
3195 }
3196
3197private:
3198 const PrintingPolicy Policy;
3199};
3200
3201} // end anonymous namespace
3202
3203std::pair<Expr *, std::string>
3204Sema::findFailedBooleanCondition(Expr *Cond) {
3205 Cond = lookThroughRangesV3Condition(PP, Cond);
3206
3207 // Separate out all of the terms in a conjunction.
3208 SmallVector<Expr *, 4> Terms;
3209 collectConjunctionTerms(Cond, Terms);
3210
3211 // Determine which term failed.
3212 Expr *FailedCond = nullptr;
3213 for (Expr *Term : Terms) {
3214 Expr *TermAsWritten = Term->IgnoreParenImpCasts();
3215
3216 // Literals are uninteresting.
3217 if (isa<CXXBoolLiteralExpr>(TermAsWritten) ||
3218 isa<IntegerLiteral>(TermAsWritten))
3219 continue;
3220
3221 // The initialization of the parameter from the argument is
3222 // a constant-evaluated context.
3223 EnterExpressionEvaluationContext ConstantEvaluated(
3224 *this, Sema::ExpressionEvaluationContext::ConstantEvaluated);
3225
3226 bool Succeeded;
3227 if (Term->EvaluateAsBooleanCondition(Succeeded, Context) &&
3228 !Succeeded) {
3229 FailedCond = TermAsWritten;
3230 break;
3231 }
3232 }
3233 if (!FailedCond)
3234 FailedCond = Cond->IgnoreParenImpCasts();
3235
3236 std::string Description;
3237 {
3238 llvm::raw_string_ostream Out(Description);
3239 PrintingPolicy Policy = getPrintingPolicy();
3240 Policy.PrintCanonicalTypes = true;
3241 FailedBooleanConditionPrinterHelper Helper(Policy);
3242 FailedCond->printPretty(Out, &Helper, Policy, 0, "\n", nullptr);
3243 }
3244 return { FailedCond, Description };
3245}
3246
3247QualType Sema::CheckTemplateIdType(TemplateName Name,
3248 SourceLocation TemplateLoc,
3249 TemplateArgumentListInfo &TemplateArgs) {
3250 DependentTemplateName *DTN
3251 = Name.getUnderlying().getAsDependentTemplateName();
3252 if (DTN && DTN->isIdentifier())
3253 // When building a template-id where the template-name is dependent,
3254 // assume the template is a type template. Either our assumption is
3255 // correct, or the code is ill-formed and will be diagnosed when the
3256 // dependent name is substituted.
3257 return Context.getDependentTemplateSpecializationType(ETK_None,
3258 DTN->getQualifier(),
3259 DTN->getIdentifier(),
3260 TemplateArgs);
3261
3262 TemplateDecl *Template = Name.getAsTemplateDecl();
3263 if (!Template || isa<FunctionTemplateDecl>(Template) ||
3264 isa<VarTemplateDecl>(Template) ||
3265 isa<ConceptDecl>(Template)) {
3266 // We might have a substituted template template parameter pack. If so,
3267 // build a template specialization type for it.
3268 if (Name.getAsSubstTemplateTemplateParmPack())
3269 return Context.getTemplateSpecializationType(Name, TemplateArgs);
3270
3271 Diag(TemplateLoc, diag::err_template_id_not_a_type)
3272 << Name;
3273 NoteAllFoundTemplates(Name);
3274 return QualType();
3275 }
3276
3277 // Check that the template argument list is well-formed for this
3278 // template.
3279 SmallVector<TemplateArgument, 4> Converted;
3280 if (CheckTemplateArgumentList(Template, TemplateLoc, TemplateArgs,
3281 false, Converted))
3282 return QualType();
3283
3284 QualType CanonType;
3285
3286 bool InstantiationDependent = false;
3287 if (TypeAliasTemplateDecl *AliasTemplate =
3288 dyn_cast<TypeAliasTemplateDecl>(Template)) {
3289 // Find the canonical type for this type alias template specialization.
3290 TypeAliasDecl *Pattern = AliasTemplate->getTemplatedDecl();
3291 if (Pattern->isInvalidDecl())
3292 return QualType();
3293
3294 TemplateArgumentList StackTemplateArgs(TemplateArgumentList::OnStack,
3295 Converted);
3296
3297 // Only substitute for the innermost template argument list.
3298 MultiLevelTemplateArgumentList TemplateArgLists;
3299 TemplateArgLists.addOuterTemplateArguments(&StackTemplateArgs);
3300 unsigned Depth = AliasTemplate->getTemplateParameters()->getDepth();
3301 for (unsigned I = 0; I < Depth; ++I)
3302 TemplateArgLists.addOuterTemplateArguments(None);
3303
3304 LocalInstantiationScope Scope(*this);
3305 InstantiatingTemplate Inst(*this, TemplateLoc, Template);
3306 if (Inst.isInvalid())
3307 return QualType();
3308
3309 CanonType = SubstType(Pattern->getUnderlyingType(),
3310 TemplateArgLists, AliasTemplate->getLocation(),
3311 AliasTemplate->getDeclName());
3312 if (CanonType.isNull()) {
3313 // If this was enable_if and we failed to find the nested type
3314 // within enable_if in a SFINAE context, dig out the specific
3315 // enable_if condition that failed and present that instead.
3316 if (isEnableIfAliasTemplate(AliasTemplate)) {
3317 if (auto DeductionInfo = isSFINAEContext()) {
3318 if (*DeductionInfo &&
3319 (*DeductionInfo)->hasSFINAEDiagnostic() &&
3320 (*DeductionInfo)->peekSFINAEDiagnostic().second.getDiagID() ==
3321 diag::err_typename_nested_not_found_enable_if &&
3322 TemplateArgs[0].getArgument().getKind()
3323 == TemplateArgument::Expression) {
3324 Expr *FailedCond;
3325 std::string FailedDescription;
3326 std::tie(FailedCond, FailedDescription) =
3327 findFailedBooleanCondition(TemplateArgs[0].getSourceExpression());
3328
3329 // Remove the old SFINAE diagnostic.
3330 PartialDiagnosticAt OldDiag =
3331 {SourceLocation(), PartialDiagnostic::NullDiagnostic()};
3332 (*DeductionInfo)->takeSFINAEDiagnostic(OldDiag);
3333
3334 // Add a new SFINAE diagnostic specifying which condition
3335 // failed.
3336 (*DeductionInfo)->addSFINAEDiagnostic(
3337 OldDiag.first,
3338 PDiag(diag::err_typename_nested_not_found_requirement)
3339 << FailedDescription
3340 << FailedCond->getSourceRange());
3341 }
3342 }
3343 }
3344
3345 return QualType();
3346 }
3347 } else if (Name.isDependent() ||
3348 TemplateSpecializationType::anyDependentTemplateArguments(
3349 TemplateArgs, InstantiationDependent)) {
3350 // This class template specialization is a dependent
3351 // type. Therefore, its canonical type is another class template
3352 // specialization type that contains all of the converted
3353 // arguments in canonical form. This ensures that, e.g., A<T> and
3354 // A<T, T> have identical types when A is declared as:
3355 //
3356 // template<typename T, typename U = T> struct A;
3357 CanonType = Context.getCanonicalTemplateSpecializationType(Name, Converted);
3358
3359 // This might work out to be a current instantiation, in which
3360 // case the canonical type needs to be the InjectedClassNameType.
3361 //
3362 // TODO: in theory this could be a simple hashtable lookup; most
3363 // changes to CurContext don't change the set of current
3364 // instantiations.
3365 if (isa<ClassTemplateDecl>(Template)) {
3366 for (DeclContext *Ctx = CurContext; Ctx; Ctx = Ctx->getLookupParent()) {
3367 // If we get out to a namespace, we're done.
3368 if (Ctx->isFileContext()) break;
3369
3370 // If this isn't a record, keep looking.
3371 CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx);
3372 if (!Record) continue;
3373
3374 // Look for one of the two cases with InjectedClassNameTypes
3375 // and check whether it's the same template.
3376 if (!isa<ClassTemplatePartialSpecializationDecl>(Record) &&
3377 !Record->getDescribedClassTemplate())
3378 continue;
3379
3380 // Fetch the injected class name type and check whether its
3381 // injected type is equal to the type we just built.
3382 QualType ICNT = Context.getTypeDeclType(Record);
3383 QualType Injected = cast<InjectedClassNameType>(ICNT)
3384 ->getInjectedSpecializationType();
3385
3386 if (CanonType != Injected->getCanonicalTypeInternal())
3387 continue;
3388
3389 // If so, the canonical type of this TST is the injected
3390 // class name type of the record we just found.
3391 assert(ICNT.isCanonical())((ICNT.isCanonical()) ? static_cast<void> (0) : __assert_fail
("ICNT.isCanonical()", "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3391, __PRETTY_FUNCTION__))
;
3392 CanonType = ICNT;
3393 break;
3394 }
3395 }
3396 } else if (ClassTemplateDecl *ClassTemplate
3397 = dyn_cast<ClassTemplateDecl>(Template)) {
3398 // Find the class template specialization declaration that
3399 // corresponds to these arguments.
3400 void *InsertPos = nullptr;
3401 ClassTemplateSpecializationDecl *Decl
3402 = ClassTemplate->findSpecialization(Converted, InsertPos);
3403 if (!Decl) {
3404 // This is the first time we have referenced this class template
3405 // specialization. Create the canonical declaration and add it to
3406 // the set of specializations.
3407 Decl = ClassTemplateSpecializationDecl::Create(
3408 Context, ClassTemplate->getTemplatedDecl()->getTagKind(),
3409 ClassTemplate->getDeclContext(),
3410 ClassTemplate->getTemplatedDecl()->getBeginLoc(),
3411 ClassTemplate->getLocation(), ClassTemplate, Converted, nullptr);
3412 ClassTemplate->AddSpecialization(Decl, InsertPos);
3413 if (ClassTemplate->isOutOfLine())
3414 Decl->setLexicalDeclContext(ClassTemplate->getLexicalDeclContext());
3415 }
3416
3417 if (Decl->getSpecializationKind() == TSK_Undeclared) {
3418 MultiLevelTemplateArgumentList TemplateArgLists;
3419 TemplateArgLists.addOuterTemplateArguments(Converted);
3420 InstantiateAttrsForDecl(TemplateArgLists, ClassTemplate->getTemplatedDecl(),
3421 Decl);
3422 }
3423
3424 // Diagnose uses of this specialization.
3425 (void)DiagnoseUseOfDecl(Decl, TemplateLoc);
3426
3427 CanonType = Context.getTypeDeclType(Decl);
3428 assert(isa<RecordType>(CanonType) &&((isa<RecordType>(CanonType) && "type of non-dependent specialization is not a RecordType"
) ? static_cast<void> (0) : __assert_fail ("isa<RecordType>(CanonType) && \"type of non-dependent specialization is not a RecordType\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3429, __PRETTY_FUNCTION__))
3429 "type of non-dependent specialization is not a RecordType")((isa<RecordType>(CanonType) && "type of non-dependent specialization is not a RecordType"
) ? static_cast<void> (0) : __assert_fail ("isa<RecordType>(CanonType) && \"type of non-dependent specialization is not a RecordType\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3429, __PRETTY_FUNCTION__))
;
3430 } else if (auto *BTD = dyn_cast<BuiltinTemplateDecl>(Template)) {
3431 CanonType = checkBuiltinTemplateIdType(*this, BTD, Converted, TemplateLoc,
3432 TemplateArgs);
3433 }
3434
3435 // Build the fully-sugared type for this class template
3436 // specialization, which refers back to the class template
3437 // specialization we created or found.
3438 return Context.getTemplateSpecializationType(Name, TemplateArgs, CanonType);
3439}
3440
3441void Sema::ActOnUndeclaredTypeTemplateName(Scope *S, TemplateTy &ParsedName,
3442 TemplateNameKind &TNK,
3443 SourceLocation NameLoc,
3444 IdentifierInfo *&II) {
3445 assert(TNK == TNK_Undeclared_template && "not an undeclared template name")((TNK == TNK_Undeclared_template && "not an undeclared template name"
) ? static_cast<void> (0) : __assert_fail ("TNK == TNK_Undeclared_template && \"not an undeclared template name\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3445, __PRETTY_FUNCTION__))
;
3446
3447 TemplateName Name = ParsedName.get();
3448 auto *ATN = Name.getAsAssumedTemplateName();
3449 assert(ATN && "not an assumed template name")((ATN && "not an assumed template name") ? static_cast
<void> (0) : __assert_fail ("ATN && \"not an assumed template name\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3449, __PRETTY_FUNCTION__))
;
3450 II = ATN->getDeclName().getAsIdentifierInfo();
3451
3452 if (!resolveAssumedTemplateNameAsType(S, Name, NameLoc, /*Diagnose*/false)) {
3453 // Resolved to a type template name.
3454 ParsedName = TemplateTy::make(Name);
3455 TNK = TNK_Type_template;
3456 }
3457}
3458
3459bool Sema::resolveAssumedTemplateNameAsType(Scope *S, TemplateName &Name,
3460 SourceLocation NameLoc,
3461 bool Diagnose) {
3462 // We assumed this undeclared identifier to be an (ADL-only) function
3463 // template name, but it was used in a context where a type was required.
3464 // Try to typo-correct it now.
3465 AssumedTemplateStorage *ATN = Name.getAsAssumedTemplateName();
3466 assert(ATN && "not an assumed template name")((ATN && "not an assumed template name") ? static_cast
<void> (0) : __assert_fail ("ATN && \"not an assumed template name\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3466, __PRETTY_FUNCTION__))
;
3467
3468 LookupResult R(*this, ATN->getDeclName(), NameLoc, LookupOrdinaryName);
3469 struct CandidateCallback : CorrectionCandidateCallback {
3470 bool ValidateCandidate(const TypoCorrection &TC) override {
3471 return TC.getCorrectionDecl() &&
3472 getAsTypeTemplateDecl(TC.getCorrectionDecl());
3473 }
3474 std::unique_ptr<CorrectionCandidateCallback> clone() override {
3475 return std::make_unique<CandidateCallback>(*this);
3476 }
3477 } FilterCCC;
3478
3479 TypoCorrection Corrected =
3480 CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, nullptr,
3481 FilterCCC, CTK_ErrorRecovery);
3482 if (Corrected && Corrected.getFoundDecl()) {
3483 diagnoseTypo(Corrected, PDiag(diag::err_no_template_suggest)
3484 << ATN->getDeclName());
3485 Name = TemplateName(Corrected.getCorrectionDeclAs<TemplateDecl>());
3486 return false;
3487 }
3488
3489 if (Diagnose)
3490 Diag(R.getNameLoc(), diag::err_no_template) << R.getLookupName();
3491 return true;
3492}
3493
3494TypeResult Sema::ActOnTemplateIdType(
3495 Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc,
3496 TemplateTy TemplateD, IdentifierInfo *TemplateII,
3497 SourceLocation TemplateIILoc, SourceLocation LAngleLoc,
3498 ASTTemplateArgsPtr TemplateArgsIn, SourceLocation RAngleLoc,
3499 bool IsCtorOrDtorName, bool IsClassName) {
3500 if (SS.isInvalid())
3501 return true;
3502
3503 if (!IsCtorOrDtorName && !IsClassName && SS.isSet()) {
3504 DeclContext *LookupCtx = computeDeclContext(SS, /*EnteringContext*/false);
3505
3506 // C++ [temp.res]p3:
3507 // A qualified-id that refers to a type and in which the
3508 // nested-name-specifier depends on a template-parameter (14.6.2)
3509 // shall be prefixed by the keyword typename to indicate that the
3510 // qualified-id denotes a type, forming an
3511 // elaborated-type-specifier (7.1.5.3).
3512 if (!LookupCtx && isDependentScopeSpecifier(SS)) {
3513 Diag(SS.getBeginLoc(), diag::err_typename_missing_template)
3514 << SS.getScopeRep() << TemplateII->getName();
3515 // Recover as if 'typename' were specified.
3516 // FIXME: This is not quite correct recovery as we don't transform SS
3517 // into the corresponding dependent form (and we don't diagnose missing
3518 // 'template' keywords within SS as a result).
3519 return ActOnTypenameType(nullptr, SourceLocation(), SS, TemplateKWLoc,
3520 TemplateD, TemplateII, TemplateIILoc, LAngleLoc,
3521 TemplateArgsIn, RAngleLoc);
3522 }
3523
3524 // Per C++ [class.qual]p2, if the template-id was an injected-class-name,
3525 // it's not actually allowed to be used as a type in most cases. Because
3526 // we annotate it before we know whether it's valid, we have to check for
3527 // this case here.
3528 auto *LookupRD = dyn_cast_or_null<CXXRecordDecl>(LookupCtx);
3529 if (LookupRD && LookupRD->getIdentifier() == TemplateII) {
3530 Diag(TemplateIILoc,
3531 TemplateKWLoc.isInvalid()
3532 ? diag::err_out_of_line_qualified_id_type_names_constructor
3533 : diag::ext_out_of_line_qualified_id_type_names_constructor)
3534 << TemplateII << 0 /*injected-class-name used as template name*/
3535 << 1 /*if any keyword was present, it was 'template'*/;
3536 }
3537 }
3538
3539 TemplateName Template = TemplateD.get();
3540 if (Template.getAsAssumedTemplateName() &&
3541 resolveAssumedTemplateNameAsType(S, Template, TemplateIILoc))
3542 return true;
3543
3544 // Translate the parser's template argument list in our AST format.
3545 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
3546 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
3547
3548 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
3549 QualType T
3550 = Context.getDependentTemplateSpecializationType(ETK_None,
3551 DTN->getQualifier(),
3552 DTN->getIdentifier(),
3553 TemplateArgs);
3554 // Build type-source information.
3555 TypeLocBuilder TLB;
3556 DependentTemplateSpecializationTypeLoc SpecTL
3557 = TLB.push<DependentTemplateSpecializationTypeLoc>(T);
3558 SpecTL.setElaboratedKeywordLoc(SourceLocation());
3559 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
3560 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
3561 SpecTL.setTemplateNameLoc(TemplateIILoc);
3562 SpecTL.setLAngleLoc(LAngleLoc);
3563 SpecTL.setRAngleLoc(RAngleLoc);
3564 for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I)
3565 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
3566 return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T));
3567 }
3568
3569 QualType Result = CheckTemplateIdType(Template, TemplateIILoc, TemplateArgs);
3570 if (Result.isNull())
3571 return true;
3572
3573 // Build type-source information.
3574 TypeLocBuilder TLB;
3575 TemplateSpecializationTypeLoc SpecTL
3576 = TLB.push<TemplateSpecializationTypeLoc>(Result);
3577 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
3578 SpecTL.setTemplateNameLoc(TemplateIILoc);
3579 SpecTL.setLAngleLoc(LAngleLoc);
3580 SpecTL.setRAngleLoc(RAngleLoc);
3581 for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i)
3582 SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo());
3583
3584 // NOTE: avoid constructing an ElaboratedTypeLoc if this is a
3585 // constructor or destructor name (in such a case, the scope specifier
3586 // will be attached to the enclosing Decl or Expr node).
3587 if (SS.isNotEmpty() && !IsCtorOrDtorName) {
3588 // Create an elaborated-type-specifier containing the nested-name-specifier.
3589 Result = Context.getElaboratedType(ETK_None, SS.getScopeRep(), Result);
3590 ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result);
3591 ElabTL.setElaboratedKeywordLoc(SourceLocation());
3592 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
3593 }
3594
3595 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
3596}
3597
3598TypeResult Sema::ActOnTagTemplateIdType(TagUseKind TUK,
3599 TypeSpecifierType TagSpec,
3600 SourceLocation TagLoc,
3601 CXXScopeSpec &SS,
3602 SourceLocation TemplateKWLoc,
3603 TemplateTy TemplateD,
3604 SourceLocation TemplateLoc,
3605 SourceLocation LAngleLoc,
3606 ASTTemplateArgsPtr TemplateArgsIn,
3607 SourceLocation RAngleLoc) {
3608 TemplateName Template = TemplateD.get();
3609
3610 // Translate the parser's template argument list in our AST format.
3611 TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
3612 translateTemplateArguments(TemplateArgsIn, TemplateArgs);
3613
3614 // Determine the tag kind
3615 TagTypeKind TagKind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
3616 ElaboratedTypeKeyword Keyword
3617 = TypeWithKeyword::getKeywordForTagTypeKind(TagKind);
3618
3619 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) {
3620 QualType T = Context.getDependentTemplateSpecializationType(Keyword,
3621 DTN->getQualifier(),
3622 DTN->getIdentifier(),
3623 TemplateArgs);
3624
3625 // Build type-source information.
3626 TypeLocBuilder TLB;
3627 DependentTemplateSpecializationTypeLoc SpecTL
3628 = TLB.push<DependentTemplateSpecializationTypeLoc>(T);
3629 SpecTL.setElaboratedKeywordLoc(TagLoc);
3630 SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
3631 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
3632 SpecTL.setTemplateNameLoc(TemplateLoc);
3633 SpecTL.setLAngleLoc(LAngleLoc);
3634 SpecTL.setRAngleLoc(RAngleLoc);
3635 for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I)
3636 SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
3637 return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T));
3638 }
3639
3640 if (TypeAliasTemplateDecl *TAT =
3641 dyn_cast_or_null<TypeAliasTemplateDecl>(Template.getAsTemplateDecl())) {
3642 // C++0x [dcl.type.elab]p2:
3643 // If the identifier resolves to a typedef-name or the simple-template-id
3644 // resolves to an alias template specialization, the
3645 // elaborated-type-specifier is ill-formed.
3646 Diag(TemplateLoc, diag::err_tag_reference_non_tag)
3647 << TAT << NTK_TypeAliasTemplate << TagKind;
3648 Diag(TAT->getLocation(), diag::note_declared_at);
3649 }
3650
3651 QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs);
3652 if (Result.isNull())
3653 return TypeResult(true);
3654
3655 // Check the tag kind
3656 if (const RecordType *RT = Result->getAs<RecordType>()) {
3657 RecordDecl *D = RT->getDecl();
3658
3659 IdentifierInfo *Id = D->getIdentifier();
3660 assert(Id && "templated class must have an identifier")((Id && "templated class must have an identifier") ? static_cast
<void> (0) : __assert_fail ("Id && \"templated class must have an identifier\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3660, __PRETTY_FUNCTION__))
;
3661
3662 if (!isAcceptableTagRedeclaration(D, TagKind, TUK == TUK_Definition,
3663 TagLoc, Id)) {
3664 Diag(TagLoc, diag::err_use_with_wrong_tag)
3665 << Result
3666 << FixItHint::CreateReplacement(SourceRange(TagLoc), D->getKindName());
3667 Diag(D->getLocation(), diag::note_previous_use);
3668 }
3669 }
3670
3671 // Provide source-location information for the template specialization.
3672 TypeLocBuilder TLB;
3673 TemplateSpecializationTypeLoc SpecTL
3674 = TLB.push<TemplateSpecializationTypeLoc>(Result);
3675 SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
3676 SpecTL.setTemplateNameLoc(TemplateLoc);
3677 SpecTL.setLAngleLoc(LAngleLoc);
3678 SpecTL.setRAngleLoc(RAngleLoc);
3679 for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i)
3680 SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo());
3681
3682 // Construct an elaborated type containing the nested-name-specifier (if any)
3683 // and tag keyword.
3684 Result = Context.getElaboratedType(Keyword, SS.getScopeRep(), Result);
3685 ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result);
3686 ElabTL.setElaboratedKeywordLoc(TagLoc);
3687 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
3688 return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result));
3689}
3690
3691static bool CheckTemplateSpecializationScope(Sema &S, NamedDecl *Specialized,
3692 NamedDecl *PrevDecl,
3693 SourceLocation Loc,
3694 bool IsPartialSpecialization);
3695
3696static TemplateSpecializationKind getTemplateSpecializationKind(Decl *D);
3697
3698static bool isTemplateArgumentTemplateParameter(
3699 const TemplateArgument &Arg, unsigned Depth, unsigned Index) {
3700 switch (Arg.getKind()) {
3701 case TemplateArgument::Null:
3702 case TemplateArgument::NullPtr:
3703 case TemplateArgument::Integral:
3704 case TemplateArgument::Declaration:
3705 case TemplateArgument::Pack:
3706 case TemplateArgument::TemplateExpansion:
3707 return false;
3708
3709 case TemplateArgument::Type: {
3710 QualType Type = Arg.getAsType();
3711 const TemplateTypeParmType *TPT =
3712 Arg.getAsType()->getAs<TemplateTypeParmType>();
3713 return TPT && !Type.hasQualifiers() &&
3714 TPT->getDepth() == Depth && TPT->getIndex() == Index;
3715 }
3716
3717 case TemplateArgument::Expression: {
3718 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg.getAsExpr());
3719 if (!DRE || !DRE->getDecl())
3720 return false;
3721 const NonTypeTemplateParmDecl *NTTP =
3722 dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl());
3723 return NTTP && NTTP->getDepth() == Depth && NTTP->getIndex() == Index;
3724 }
3725
3726 case TemplateArgument::Template:
3727 const TemplateTemplateParmDecl *TTP =
3728 dyn_cast_or_null<TemplateTemplateParmDecl>(
3729 Arg.getAsTemplateOrTemplatePattern().getAsTemplateDecl());
3730 return TTP && TTP->getDepth() == Depth && TTP->getIndex() == Index;
3731 }
3732 llvm_unreachable("unexpected kind of template argument")::llvm::llvm_unreachable_internal("unexpected kind of template argument"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3732)
;
3733}
3734
3735static bool isSameAsPrimaryTemplate(TemplateParameterList *Params,
3736 ArrayRef<TemplateArgument> Args) {
3737 if (Params->size() != Args.size())
3738 return false;
3739
3740 unsigned Depth = Params->getDepth();
3741
3742 for (unsigned I = 0, N = Args.size(); I != N; ++I) {
3743 TemplateArgument Arg = Args[I];
3744
3745 // If the parameter is a pack expansion, the argument must be a pack
3746 // whose only element is a pack expansion.
3747 if (Params->getParam(I)->isParameterPack()) {
3748 if (Arg.getKind() != TemplateArgument::Pack || Arg.pack_size() != 1 ||
3749 !Arg.pack_begin()->isPackExpansion())
3750 return false;
3751 Arg = Arg.pack_begin()->getPackExpansionPattern();
3752 }
3753
3754 if (!isTemplateArgumentTemplateParameter(Arg, Depth, I))
3755 return false;
3756 }
3757
3758 return true;
3759}
3760
3761/// Convert the parser's template argument list representation into our form.
3762static TemplateArgumentListInfo
3763makeTemplateArgumentListInfo(Sema &S, TemplateIdAnnotation &TemplateId) {
3764 TemplateArgumentListInfo TemplateArgs(TemplateId.LAngleLoc,
3765 TemplateId.RAngleLoc);
3766 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId.getTemplateArgs(),
3767 TemplateId.NumArgs);
3768 S.translateTemplateArguments(TemplateArgsPtr, TemplateArgs);
3769 return TemplateArgs;
3770}
3771
3772template<typename PartialSpecDecl>
3773static void checkMoreSpecializedThanPrimary(Sema &S, PartialSpecDecl *Partial) {
3774 if (Partial->getDeclContext()->isDependentContext())
3775 return;
3776
3777 // FIXME: Get the TDK from deduction in order to provide better diagnostics
3778 // for non-substitution-failure issues?
3779 TemplateDeductionInfo Info(Partial->getLocation());
3780 if (S.isMoreSpecializedThanPrimary(Partial, Info))
3781 return;
3782
3783 auto *Template = Partial->getSpecializedTemplate();
3784 S.Diag(Partial->getLocation(),
3785 diag::ext_partial_spec_not_more_specialized_than_primary)
3786 << isa<VarTemplateDecl>(Template);
3787
3788 if (Info.hasSFINAEDiagnostic()) {
3789 PartialDiagnosticAt Diag = {SourceLocation(),
3790 PartialDiagnostic::NullDiagnostic()};
3791 Info.takeSFINAEDiagnostic(Diag);
3792 SmallString<128> SFINAEArgString;
3793 Diag.second.EmitToString(S.getDiagnostics(), SFINAEArgString);
3794 S.Diag(Diag.first,
3795 diag::note_partial_spec_not_more_specialized_than_primary)
3796 << SFINAEArgString;
3797 }
3798
3799 S.Diag(Template->getLocation(), diag::note_template_decl_here);
3800}
3801
3802static void
3803noteNonDeducibleParameters(Sema &S, TemplateParameterList *TemplateParams,
3804 const llvm::SmallBitVector &DeducibleParams) {
3805 for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I) {
3806 if (!DeducibleParams[I]) {
3807 NamedDecl *Param = TemplateParams->getParam(I);
3808 if (Param->getDeclName())
3809 S.Diag(Param->getLocation(), diag::note_non_deducible_parameter)
3810 << Param->getDeclName();
3811 else
3812 S.Diag(Param->getLocation(), diag::note_non_deducible_parameter)
3813 << "(anonymous)";
3814 }
3815 }
3816}
3817
3818
3819template<typename PartialSpecDecl>
3820static void checkTemplatePartialSpecialization(Sema &S,
3821 PartialSpecDecl *Partial) {
3822 // C++1z [temp.class.spec]p8: (DR1495)
3823 // - The specialization shall be more specialized than the primary
3824 // template (14.5.5.2).
3825 checkMoreSpecializedThanPrimary(S, Partial);
3826
3827 // C++ [temp.class.spec]p8: (DR1315)
3828 // - Each template-parameter shall appear at least once in the
3829 // template-id outside a non-deduced context.
3830 // C++1z [temp.class.spec.match]p3 (P0127R2)
3831 // If the template arguments of a partial specialization cannot be
3832 // deduced because of the structure of its template-parameter-list
3833 // and the template-id, the program is ill-formed.
3834 auto *TemplateParams = Partial->getTemplateParameters();
3835 llvm::SmallBitVector DeducibleParams(TemplateParams->size());
3836 S.MarkUsedTemplateParameters(Partial->getTemplateArgs(), true,
3837 TemplateParams->getDepth(), DeducibleParams);
3838
3839 if (!DeducibleParams.all()) {
3840 unsigned NumNonDeducible = DeducibleParams.size() - DeducibleParams.count();
3841 S.Diag(Partial->getLocation(), diag::ext_partial_specs_not_deducible)
3842 << isa<VarTemplatePartialSpecializationDecl>(Partial)
3843 << (NumNonDeducible > 1)
3844 << SourceRange(Partial->getLocation(),
3845 Partial->getTemplateArgsAsWritten()->RAngleLoc);
3846 noteNonDeducibleParameters(S, TemplateParams, DeducibleParams);
3847 }
3848}
3849
3850void Sema::CheckTemplatePartialSpecialization(
3851 ClassTemplatePartialSpecializationDecl *Partial) {
3852 checkTemplatePartialSpecialization(*this, Partial);
3853}
3854
3855void Sema::CheckTemplatePartialSpecialization(
3856 VarTemplatePartialSpecializationDecl *Partial) {
3857 checkTemplatePartialSpecialization(*this, Partial);
3858}
3859
3860void Sema::CheckDeductionGuideTemplate(FunctionTemplateDecl *TD) {
3861 // C++1z [temp.param]p11:
3862 // A template parameter of a deduction guide template that does not have a
3863 // default-argument shall be deducible from the parameter-type-list of the
3864 // deduction guide template.
3865 auto *TemplateParams = TD->getTemplateParameters();
3866 llvm::SmallBitVector DeducibleParams(TemplateParams->size());
3867 MarkDeducedTemplateParameters(TD, DeducibleParams);
3868 for (unsigned I = 0; I != TemplateParams->size(); ++I) {
3869 // A parameter pack is deducible (to an empty pack).
3870 auto *Param = TemplateParams->getParam(I);
3871 if (Param->isParameterPack() || hasVisibleDefaultArgument(Param))
3872 DeducibleParams[I] = true;
3873 }
3874
3875 if (!DeducibleParams.all()) {
3876 unsigned NumNonDeducible = DeducibleParams.size() - DeducibleParams.count();
3877 Diag(TD->getLocation(), diag::err_deduction_guide_template_not_deducible)
3878 << (NumNonDeducible > 1);
3879 noteNonDeducibleParameters(*this, TemplateParams, DeducibleParams);
3880 }
3881}
3882
3883DeclResult Sema::ActOnVarTemplateSpecialization(
3884 Scope *S, Declarator &D, TypeSourceInfo *DI, SourceLocation TemplateKWLoc,
3885 TemplateParameterList *TemplateParams, StorageClass SC,
3886 bool IsPartialSpecialization) {
3887 // D must be variable template id.
3888 assert(D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId &&((D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId &&
"Variable template specialization is declared with a template it."
) ? static_cast<void> (0) : __assert_fail ("D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId && \"Variable template specialization is declared with a template it.\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3889, __PRETTY_FUNCTION__))
3889 "Variable template specialization is declared with a template it.")((D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId &&
"Variable template specialization is declared with a template it."
) ? static_cast<void> (0) : __assert_fail ("D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId && \"Variable template specialization is declared with a template it.\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 3889, __PRETTY_FUNCTION__))
;
3890
3891 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
3892 TemplateArgumentListInfo TemplateArgs =
3893 makeTemplateArgumentListInfo(*this, *TemplateId);
3894 SourceLocation TemplateNameLoc = D.getIdentifierLoc();
3895 SourceLocation LAngleLoc = TemplateId->LAngleLoc;
3896 SourceLocation RAngleLoc = TemplateId->RAngleLoc;
3897
3898 TemplateName Name = TemplateId->Template.get();
3899
3900 // The template-id must name a variable template.
3901 VarTemplateDecl *VarTemplate =
3902 dyn_cast_or_null<VarTemplateDecl>(Name.getAsTemplateDecl());
3903 if (!VarTemplate) {
3904 NamedDecl *FnTemplate;
3905 if (auto *OTS = Name.getAsOverloadedTemplate())
3906 FnTemplate = *OTS->begin();
3907 else
3908 FnTemplate = dyn_cast_or_null<FunctionTemplateDecl>(Name.getAsTemplateDecl());
3909 if (FnTemplate)
3910 return Diag(D.getIdentifierLoc(), diag::err_var_spec_no_template_but_method)
3911 << FnTemplate->getDeclName();
3912 return Diag(D.getIdentifierLoc(), diag::err_var_spec_no_template)
3913 << IsPartialSpecialization;
3914 }
3915
3916 // Check for unexpanded parameter packs in any of the template arguments.
3917 for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
3918 if (DiagnoseUnexpandedParameterPack(TemplateArgs[I],
3919 UPPC_PartialSpecialization))
3920 return true;
3921
3922 // Check that the template argument list is well-formed for this
3923 // template.
3924 SmallVector<TemplateArgument, 4> Converted;
3925 if (CheckTemplateArgumentList(VarTemplate, TemplateNameLoc, TemplateArgs,
3926 false, Converted))
3927 return true;
3928
3929 // Find the variable template (partial) specialization declaration that
3930 // corresponds to these arguments.
3931 if (IsPartialSpecialization) {
3932 if (CheckTemplatePartialSpecializationArgs(TemplateNameLoc, VarTemplate,
3933 TemplateArgs.size(), Converted))
3934 return true;
3935
3936 // FIXME: Move these checks to CheckTemplatePartialSpecializationArgs so we
3937 // also do them during instantiation.
3938 bool InstantiationDependent;
3939 if (!Name.isDependent() &&
3940 !TemplateSpecializationType::anyDependentTemplateArguments(
3941 TemplateArgs.arguments(),
3942 InstantiationDependent)) {
3943 Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized)
3944 << VarTemplate->getDeclName();
3945 IsPartialSpecialization = false;
3946 }
3947
3948 if (isSameAsPrimaryTemplate(VarTemplate->getTemplateParameters(),
3949 Converted)) {
3950 // C++ [temp.class.spec]p9b3:
3951 //
3952 // -- The argument list of the specialization shall not be identical
3953 // to the implicit argument list of the primary template.
3954 Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template)
3955 << /*variable template*/ 1
3956 << /*is definition*/(SC != SC_Extern && !CurContext->isRecord())
3957 << FixItHint::CreateRemoval(SourceRange(LAngleLoc, RAngleLoc));
3958 // FIXME: Recover from this by treating the declaration as a redeclaration
3959 // of the primary template.
3960 return true;
3961 }
3962 }
3963
3964 void *InsertPos = nullptr;
3965 VarTemplateSpecializationDecl *PrevDecl = nullptr;
3966
3967 if (IsPartialSpecialization)
3968 // FIXME: Template parameter list matters too
3969 PrevDecl = VarTemplate->findPartialSpecialization(Converted, InsertPos);
3970 else
3971 PrevDecl = VarTemplate->findSpecialization(Converted, InsertPos);
3972
3973 VarTemplateSpecializationDecl *Specialization = nullptr;
3974
3975 // Check whether we can declare a variable template specialization in
3976 // the current scope.
3977 if (CheckTemplateSpecializationScope(*this, VarTemplate, PrevDecl,
3978 TemplateNameLoc,
3979 IsPartialSpecialization))
3980 return true;
3981
3982 if (PrevDecl && PrevDecl->getSpecializationKind() == TSK_Undeclared) {
3983 // Since the only prior variable template specialization with these
3984 // arguments was referenced but not declared, reuse that
3985 // declaration node as our own, updating its source location and
3986 // the list of outer template parameters to reflect our new declaration.
3987 Specialization = PrevDecl;
3988 Specialization->setLocation(TemplateNameLoc);
3989 PrevDecl = nullptr;
3990 } else if (IsPartialSpecialization) {
3991 // Create a new class template partial specialization declaration node.
3992 VarTemplatePartialSpecializationDecl *PrevPartial =
3993 cast_or_null<VarTemplatePartialSpecializationDecl>(PrevDecl);
3994 VarTemplatePartialSpecializationDecl *Partial =
3995 VarTemplatePartialSpecializationDecl::Create(
3996 Context, VarTemplate->getDeclContext(), TemplateKWLoc,
3997 TemplateNameLoc, TemplateParams, VarTemplate, DI->getType(), DI, SC,
3998 Converted, TemplateArgs);
3999
4000 if (!PrevPartial)
4001 VarTemplate->AddPartialSpecialization(Partial, InsertPos);
4002 Specialization = Partial;
4003
4004 // If we are providing an explicit specialization of a member variable
4005 // template specialization, make a note of that.
4006 if (PrevPartial && PrevPartial->getInstantiatedFromMember())
4007 PrevPartial->setMemberSpecialization();
4008
4009 CheckTemplatePartialSpecialization(Partial);
4010 } else {
4011 // Create a new class template specialization declaration node for
4012 // this explicit specialization or friend declaration.
4013 Specialization = VarTemplateSpecializationDecl::Create(
4014 Context, VarTemplate->getDeclContext(), TemplateKWLoc, TemplateNameLoc,
4015 VarTemplate, DI->getType(), DI, SC, Converted);
4016 Specialization->setTemplateArgsInfo(TemplateArgs);
4017
4018 if (!PrevDecl)
4019 VarTemplate->AddSpecialization(Specialization, InsertPos);
4020 }
4021
4022 // C++ [temp.expl.spec]p6:
4023 // If a template, a member template or the member of a class template is
4024 // explicitly specialized then that specialization shall be declared
4025 // before the first use of that specialization that would cause an implicit
4026 // instantiation to take place, in every translation unit in which such a
4027 // use occurs; no diagnostic is required.
4028 if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) {
4029 bool Okay = false;
4030 for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) {
4031 // Is there any previous explicit specialization declaration?
4032 if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) {
4033 Okay = true;
4034 break;
4035 }
4036 }
4037
4038 if (!Okay) {
4039 SourceRange Range(TemplateNameLoc, RAngleLoc);
4040 Diag(TemplateNameLoc, diag::err_specialization_after_instantiation)
4041 << Name << Range;
4042
4043 Diag(PrevDecl->getPointOfInstantiation(),
4044 diag::note_instantiation_required_here)
4045 << (PrevDecl->getTemplateSpecializationKind() !=
4046 TSK_ImplicitInstantiation);
4047 return true;
4048 }
4049 }
4050
4051 Specialization->setTemplateKeywordLoc(TemplateKWLoc);
4052 Specialization->setLexicalDeclContext(CurContext);
4053
4054 // Add the specialization into its lexical context, so that it can
4055 // be seen when iterating through the list of declarations in that
4056 // context. However, specializations are not found by name lookup.
4057 CurContext->addDecl(Specialization);
4058
4059 // Note that this is an explicit specialization.
4060 Specialization->setSpecializationKind(TSK_ExplicitSpecialization);
4061
4062 if (PrevDecl) {
4063 // Check that this isn't a redefinition of this specialization,
4064 // merging with previous declarations.
4065 LookupResult PrevSpec(*this, GetNameForDeclarator(D), LookupOrdinaryName,
4066 forRedeclarationInCurContext());
4067 PrevSpec.addDecl(PrevDecl);
4068 D.setRedeclaration(CheckVariableDeclaration(Specialization, PrevSpec));
4069 } else if (Specialization->isStaticDataMember() &&
4070 Specialization->isOutOfLine()) {
4071 Specialization->setAccess(VarTemplate->getAccess());
4072 }
4073
4074 return Specialization;
4075}
4076
4077namespace {
4078/// A partial specialization whose template arguments have matched
4079/// a given template-id.
4080struct PartialSpecMatchResult {
4081 VarTemplatePartialSpecializationDecl *Partial;
4082 TemplateArgumentList *Args;
4083};
4084} // end anonymous namespace
4085
4086DeclResult
4087Sema::CheckVarTemplateId(VarTemplateDecl *Template, SourceLocation TemplateLoc,
4088 SourceLocation TemplateNameLoc,
4089 const TemplateArgumentListInfo &TemplateArgs) {
4090 assert(Template && "A variable template id without template?")((Template && "A variable template id without template?"
) ? static_cast<void> (0) : __assert_fail ("Template && \"A variable template id without template?\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4090, __PRETTY_FUNCTION__))
;
4091
4092 // Check that the template argument list is well-formed for this template.
4093 SmallVector<TemplateArgument, 4> Converted;
4094 if (CheckTemplateArgumentList(
4095 Template, TemplateNameLoc,
4096 const_cast<TemplateArgumentListInfo &>(TemplateArgs), false,
4097 Converted))
4098 return true;
4099
4100 // Find the variable template specialization declaration that
4101 // corresponds to these arguments.
4102 void *InsertPos = nullptr;
4103 if (VarTemplateSpecializationDecl *Spec = Template->findSpecialization(
4104 Converted, InsertPos)) {
4105 checkSpecializationVisibility(TemplateNameLoc, Spec);
4106 // If we already have a variable template specialization, return it.
4107 return Spec;
4108 }
4109
4110 // This is the first time we have referenced this variable template
4111 // specialization. Create the canonical declaration and add it to
4112 // the set of specializations, based on the closest partial specialization
4113 // that it represents. That is,
4114 VarDecl *InstantiationPattern = Template->getTemplatedDecl();
4115 TemplateArgumentList TemplateArgList(TemplateArgumentList::OnStack,
4116 Converted);
4117 TemplateArgumentList *InstantiationArgs = &TemplateArgList;
4118 bool AmbiguousPartialSpec = false;
4119 typedef PartialSpecMatchResult MatchResult;
4120 SmallVector<MatchResult, 4> Matched;
4121 SourceLocation PointOfInstantiation = TemplateNameLoc;
4122 TemplateSpecCandidateSet FailedCandidates(PointOfInstantiation,
4123 /*ForTakingAddress=*/false);
4124
4125 // 1. Attempt to find the closest partial specialization that this
4126 // specializes, if any.
4127 // If any of the template arguments is dependent, then this is probably
4128 // a placeholder for an incomplete declarative context; which must be
4129 // complete by instantiation time. Thus, do not search through the partial
4130 // specializations yet.
4131 // TODO: Unify with InstantiateClassTemplateSpecialization()?
4132 // Perhaps better after unification of DeduceTemplateArguments() and
4133 // getMoreSpecializedPartialSpecialization().
4134 bool InstantiationDependent = false;
4135 if (!TemplateSpecializationType::anyDependentTemplateArguments(
4136 TemplateArgs, InstantiationDependent)) {
4137
4138 SmallVector<VarTemplatePartialSpecializationDecl *, 4> PartialSpecs;
4139 Template->getPartialSpecializations(PartialSpecs);
4140
4141 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) {
4142 VarTemplatePartialSpecializationDecl *Partial = PartialSpecs[I];
4143 TemplateDeductionInfo Info(FailedCandidates.getLocation());
4144
4145 if (TemplateDeductionResult Result =
4146 DeduceTemplateArguments(Partial, TemplateArgList, Info)) {
4147 // Store the failed-deduction information for use in diagnostics, later.
4148 // TODO: Actually use the failed-deduction info?
4149 FailedCandidates.addCandidate().set(
4150 DeclAccessPair::make(Template, AS_public), Partial,
4151 MakeDeductionFailureInfo(Context, Result, Info));
4152 (void)Result;
4153 } else {
4154 Matched.push_back(PartialSpecMatchResult());
4155 Matched.back().Partial = Partial;
4156 Matched.back().Args = Info.take();
4157 }
4158 }
4159
4160 if (Matched.size() >= 1) {
4161 SmallVector<MatchResult, 4>::iterator Best = Matched.begin();
4162 if (Matched.size() == 1) {
4163 // -- If exactly one matching specialization is found, the
4164 // instantiation is generated from that specialization.
4165 // We don't need to do anything for this.
4166 } else {
4167 // -- If more than one matching specialization is found, the
4168 // partial order rules (14.5.4.2) are used to determine
4169 // whether one of the specializations is more specialized
4170 // than the others. If none of the specializations is more
4171 // specialized than all of the other matching
4172 // specializations, then the use of the variable template is
4173 // ambiguous and the program is ill-formed.
4174 for (SmallVector<MatchResult, 4>::iterator P = Best + 1,
4175 PEnd = Matched.end();
4176 P != PEnd; ++P) {
4177 if (getMoreSpecializedPartialSpecialization(P->Partial, Best->Partial,
4178 PointOfInstantiation) ==
4179 P->Partial)
4180 Best = P;
4181 }
4182
4183 // Determine if the best partial specialization is more specialized than
4184 // the others.
4185 for (SmallVector<MatchResult, 4>::iterator P = Matched.begin(),
4186 PEnd = Matched.end();
4187 P != PEnd; ++P) {
4188 if (P != Best && getMoreSpecializedPartialSpecialization(
4189 P->Partial, Best->Partial,
4190 PointOfInstantiation) != Best->Partial) {
4191 AmbiguousPartialSpec = true;
4192 break;
4193 }
4194 }
4195 }
4196
4197 // Instantiate using the best variable template partial specialization.
4198 InstantiationPattern = Best->Partial;
4199 InstantiationArgs = Best->Args;
4200 } else {
4201 // -- If no match is found, the instantiation is generated
4202 // from the primary template.
4203 // InstantiationPattern = Template->getTemplatedDecl();
4204 }
4205 }
4206
4207 // 2. Create the canonical declaration.
4208 // Note that we do not instantiate a definition until we see an odr-use
4209 // in DoMarkVarDeclReferenced().
4210 // FIXME: LateAttrs et al.?
4211 VarTemplateSpecializationDecl *Decl = BuildVarTemplateInstantiation(
4212 Template, InstantiationPattern, *InstantiationArgs, TemplateArgs,
4213 Converted, TemplateNameLoc, InsertPos /*, LateAttrs, StartingScope*/);
4214 if (!Decl)
4215 return true;
4216
4217 if (AmbiguousPartialSpec) {
4218 // Partial ordering did not produce a clear winner. Complain.
4219 Decl->setInvalidDecl();
4220 Diag(PointOfInstantiation, diag::err_partial_spec_ordering_ambiguous)
4221 << Decl;
4222
4223 // Print the matching partial specializations.
4224 for (MatchResult P : Matched)
4225 Diag(P.Partial->getLocation(), diag::note_partial_spec_match)
4226 << getTemplateArgumentBindingsText(P.Partial->getTemplateParameters(),
4227 *P.Args);
4228 return true;
4229 }
4230
4231 if (VarTemplatePartialSpecializationDecl *D =
4232 dyn_cast<VarTemplatePartialSpecializationDecl>(InstantiationPattern))
4233 Decl->setInstantiationOf(D, InstantiationArgs);
4234
4235 checkSpecializationVisibility(TemplateNameLoc, Decl);
4236
4237 assert(Decl && "No variable template specialization?")((Decl && "No variable template specialization?") ? static_cast
<void> (0) : __assert_fail ("Decl && \"No variable template specialization?\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4237, __PRETTY_FUNCTION__))
;
4238 return Decl;
4239}
4240
4241ExprResult
4242Sema::CheckVarTemplateId(const CXXScopeSpec &SS,
4243 const DeclarationNameInfo &NameInfo,
4244 VarTemplateDecl *Template, SourceLocation TemplateLoc,
4245 const TemplateArgumentListInfo *TemplateArgs) {
4246
4247 DeclResult Decl = CheckVarTemplateId(Template, TemplateLoc, NameInfo.getLoc(),
4248 *TemplateArgs);
4249 if (Decl.isInvalid())
4250 return ExprError();
4251
4252 VarDecl *Var = cast<VarDecl>(Decl.get());
4253 if (!Var->getTemplateSpecializationKind())
4254 Var->setTemplateSpecializationKind(TSK_ImplicitInstantiation,
4255 NameInfo.getLoc());
4256
4257 // Build an ordinary singleton decl ref.
4258 return BuildDeclarationNameExpr(SS, NameInfo, Var,
4259 /*FoundD=*/nullptr, TemplateArgs);
4260}
4261
4262void Sema::diagnoseMissingTemplateArguments(TemplateName Name,
4263 SourceLocation Loc) {
4264 Diag(Loc, diag::err_template_missing_args)
4265 << (int)getTemplateNameKindForDiagnostics(Name) << Name;
4266 if (TemplateDecl *TD = Name.getAsTemplateDecl()) {
4267 Diag(TD->getLocation(), diag::note_template_decl_here)
4268 << TD->getTemplateParameters()->getSourceRange();
4269 }
4270}
4271
4272ExprResult
4273Sema::CheckConceptTemplateId(const CXXScopeSpec &SS,
4274 const DeclarationNameInfo &NameInfo,
4275 ConceptDecl *Template,
4276 SourceLocation TemplateLoc,
4277 const TemplateArgumentListInfo *TemplateArgs) {
4278 // TODO: Do concept specialization here.
4279 Diag(NameInfo.getBeginLoc(), diag::err_concept_not_implemented) <<
4280 "concept specialization";
4281 return ExprError();
4282}
4283
4284ExprResult Sema::BuildTemplateIdExpr(const CXXScopeSpec &SS,
4285 SourceLocation TemplateKWLoc,
4286 LookupResult &R,
4287 bool RequiresADL,
4288 const TemplateArgumentListInfo *TemplateArgs) {
4289 // FIXME: Can we do any checking at this point? I guess we could check the
4290 // template arguments that we have against the template name, if the template
4291 // name refers to a single template. That's not a terribly common case,
4292 // though.
4293 // foo<int> could identify a single function unambiguously
4294 // This approach does NOT work, since f<int>(1);
4295 // gets resolved prior to resorting to overload resolution
4296 // i.e., template<class T> void f(double);
4297 // vs template<class T, class U> void f(U);
4298
4299 // These should be filtered out by our callers.
4300 assert(!R.isAmbiguous() && "ambiguous lookup when building templateid")((!R.isAmbiguous() && "ambiguous lookup when building templateid"
) ? static_cast<void> (0) : __assert_fail ("!R.isAmbiguous() && \"ambiguous lookup when building templateid\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4300, __PRETTY_FUNCTION__))
;
4301
4302 // Non-function templates require a template argument list.
4303 if (auto *TD = R.getAsSingle<TemplateDecl>()) {
4304 if (!TemplateArgs && !isa<FunctionTemplateDecl>(TD)) {
4305 diagnoseMissingTemplateArguments(TemplateName(TD), R.getNameLoc());
4306 return ExprError();
4307 }
4308 }
4309
4310 auto AnyDependentArguments = [&]() -> bool {
4311 bool InstantiationDependent;
4312 return TemplateArgs &&
4313 TemplateSpecializationType::anyDependentTemplateArguments(
4314 *TemplateArgs, InstantiationDependent);
4315 };
4316
4317 // In C++1y, check variable template ids.
4318 if (R.getAsSingle<VarTemplateDecl>() && !AnyDependentArguments()) {
4319 return CheckVarTemplateId(SS, R.getLookupNameInfo(),
4320 R.getAsSingle<VarTemplateDecl>(),
4321 TemplateKWLoc, TemplateArgs);
4322 }
4323
4324 if (R.getAsSingle<ConceptDecl>() && !AnyDependentArguments()) {
4325 return CheckConceptTemplateId(SS, R.getLookupNameInfo(),
4326 R.getAsSingle<ConceptDecl>(),
4327 TemplateKWLoc, TemplateArgs);
4328 }
4329
4330 // We don't want lookup warnings at this point.
4331 R.suppressDiagnostics();
4332
4333 UnresolvedLookupExpr *ULE
4334 = UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
4335 SS.getWithLocInContext(Context),
4336 TemplateKWLoc,
4337 R.getLookupNameInfo(),
4338 RequiresADL, TemplateArgs,
4339 R.begin(), R.end());
4340
4341 return ULE;
4342}
4343
4344// We actually only call this from template instantiation.
4345ExprResult
4346Sema::BuildQualifiedTemplateIdExpr(CXXScopeSpec &SS,
4347 SourceLocation TemplateKWLoc,
4348 const DeclarationNameInfo &NameInfo,
4349 const TemplateArgumentListInfo *TemplateArgs) {
4350
4351 assert(TemplateArgs || TemplateKWLoc.isValid())((TemplateArgs || TemplateKWLoc.isValid()) ? static_cast<void
> (0) : __assert_fail ("TemplateArgs || TemplateKWLoc.isValid()"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4351, __PRETTY_FUNCTION__))
;
4352 DeclContext *DC;
4353 if (!(DC = computeDeclContext(SS, false)) ||
4354 DC->isDependentContext() ||
4355 RequireCompleteDeclContext(SS, DC))
4356 return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs);
4357
4358 bool MemberOfUnknownSpecialization;
4359 LookupResult R(*this, NameInfo, LookupOrdinaryName);
4360 if (LookupTemplateName(R, (Scope *)nullptr, SS, QualType(),
4361 /*Entering*/false, MemberOfUnknownSpecialization,
4362 TemplateKWLoc))
4363 return ExprError();
4364
4365 if (R.isAmbiguous())
4366 return ExprError();
4367
4368 if (R.empty()) {
4369 Diag(NameInfo.getLoc(), diag::err_no_member)
4370 << NameInfo.getName() << DC << SS.getRange();
4371 return ExprError();
4372 }
4373
4374 if (ClassTemplateDecl *Temp = R.getAsSingle<ClassTemplateDecl>()) {
4375 Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_class_template)
4376 << SS.getScopeRep()
4377 << NameInfo.getName().getAsString() << SS.getRange();
4378 Diag(Temp->getLocation(), diag::note_referenced_class_template);
4379 return ExprError();
4380 }
4381
4382 return BuildTemplateIdExpr(SS, TemplateKWLoc, R, /*ADL*/ false, TemplateArgs);
4383}
4384
4385/// Form a dependent template name.
4386///
4387/// This action forms a dependent template name given the template
4388/// name and its (presumably dependent) scope specifier. For
4389/// example, given "MetaFun::template apply", the scope specifier \p
4390/// SS will be "MetaFun::", \p TemplateKWLoc contains the location
4391/// of the "template" keyword, and "apply" is the \p Name.
4392TemplateNameKind Sema::ActOnDependentTemplateName(Scope *S,
4393 CXXScopeSpec &SS,
4394 SourceLocation TemplateKWLoc,
4395 const UnqualifiedId &Name,
4396 ParsedType ObjectType,
4397 bool EnteringContext,
4398 TemplateTy &Result,
4399 bool AllowInjectedClassName) {
4400 if (TemplateKWLoc.isValid() && S && !S->getTemplateParamParent())
4401 Diag(TemplateKWLoc,
4402 getLangOpts().CPlusPlus11 ?
4403 diag::warn_cxx98_compat_template_outside_of_template :
4404 diag::ext_template_outside_of_template)
4405 << FixItHint::CreateRemoval(TemplateKWLoc);
4406
4407 DeclContext *LookupCtx = nullptr;
4408 if (SS.isSet())
4409 LookupCtx = computeDeclContext(SS, EnteringContext);
4410 if (!LookupCtx && ObjectType)
4411 LookupCtx = computeDeclContext(ObjectType.get());
4412 if (LookupCtx) {
4413 // C++0x [temp.names]p5:
4414 // If a name prefixed by the keyword template is not the name of
4415 // a template, the program is ill-formed. [Note: the keyword
4416 // template may not be applied to non-template members of class
4417 // templates. -end note ] [ Note: as is the case with the
4418 // typename prefix, the template prefix is allowed in cases
4419 // where it is not strictly necessary; i.e., when the
4420 // nested-name-specifier or the expression on the left of the ->
4421 // or . is not dependent on a template-parameter, or the use
4422 // does not appear in the scope of a template. -end note]
4423 //
4424 // Note: C++03 was more strict here, because it banned the use of
4425 // the "template" keyword prior to a template-name that was not a
4426 // dependent name. C++ DR468 relaxed this requirement (the
4427 // "template" keyword is now permitted). We follow the C++0x
4428 // rules, even in C++03 mode with a warning, retroactively applying the DR.
4429 bool MemberOfUnknownSpecialization;
4430 TemplateNameKind TNK = isTemplateName(S, SS, TemplateKWLoc.isValid(), Name,
4431 ObjectType, EnteringContext, Result,
4432 MemberOfUnknownSpecialization);
4433 if (TNK == TNK_Non_template && MemberOfUnknownSpecialization) {
4434 // This is a dependent template. Handle it below.
4435 } else if (TNK == TNK_Non_template) {
4436 // Do the lookup again to determine if this is a "nothing found" case or
4437 // a "not a template" case. FIXME: Refactor isTemplateName so we don't
4438 // need to do this.
4439 DeclarationNameInfo DNI = GetNameFromUnqualifiedId(Name);
4440 LookupResult R(*this, DNI.getName(), Name.getBeginLoc(),
4441 LookupOrdinaryName);
4442 bool MOUS;
4443 if (!LookupTemplateName(R, S, SS, ObjectType.get(), EnteringContext,
4444 MOUS, TemplateKWLoc) && !R.isAmbiguous())
4445 Diag(Name.getBeginLoc(), diag::err_no_member)
4446 << DNI.getName() << LookupCtx << SS.getRange();
4447 return TNK_Non_template;
4448 } else {
4449 // We found something; return it.
4450 auto *LookupRD = dyn_cast<CXXRecordDecl>(LookupCtx);
4451 if (!AllowInjectedClassName && SS.isSet() && LookupRD &&
4452 Name.getKind() == UnqualifiedIdKind::IK_Identifier &&
4453 Name.Identifier && LookupRD->getIdentifier() == Name.Identifier) {
4454 // C++14 [class.qual]p2:
4455 // In a lookup in which function names are not ignored and the
4456 // nested-name-specifier nominates a class C, if the name specified
4457 // [...] is the injected-class-name of C, [...] the name is instead
4458 // considered to name the constructor
4459 //
4460 // We don't get here if naming the constructor would be valid, so we
4461 // just reject immediately and recover by treating the
4462 // injected-class-name as naming the template.
4463 Diag(Name.getBeginLoc(),
4464 diag::ext_out_of_line_qualified_id_type_names_constructor)
4465 << Name.Identifier
4466 << 0 /*injected-class-name used as template name*/
4467 << 1 /*'template' keyword was used*/;
4468 }
4469 return TNK;
4470 }
4471 }
4472
4473 NestedNameSpecifier *Qualifier = SS.getScopeRep();
4474
4475 switch (Name.getKind()) {
4476 case UnqualifiedIdKind::IK_Identifier:
4477 Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier,
4478 Name.Identifier));
4479 return TNK_Dependent_template_name;
4480
4481 case UnqualifiedIdKind::IK_OperatorFunctionId:
4482 Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier,
4483 Name.OperatorFunctionId.Operator));
4484 return TNK_Function_template;
4485
4486 case UnqualifiedIdKind::IK_LiteralOperatorId:
4487 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-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4487)
;
4488
4489 default:
4490 break;
4491 }
4492
4493 Diag(Name.getBeginLoc(), diag::err_template_kw_refers_to_non_template)
4494 << GetNameFromUnqualifiedId(Name).getName() << Name.getSourceRange()
4495 << TemplateKWLoc;
4496 return TNK_Non_template;
4497}
4498
4499bool Sema::CheckTemplateTypeArgument(TemplateTypeParmDecl *Param,
4500 TemplateArgumentLoc &AL,
4501 SmallVectorImpl<TemplateArgument> &Converted) {
4502 const TemplateArgument &Arg = AL.getArgument();
4503 QualType ArgType;
4504 TypeSourceInfo *TSI = nullptr;
4505
4506 // Check template type parameter.
4507 switch(Arg.getKind()) {
4508 case TemplateArgument::Type:
4509 // C++ [temp.arg.type]p1:
4510 // A template-argument for a template-parameter which is a
4511 // type shall be a type-id.
4512 ArgType = Arg.getAsType();
4513 TSI = AL.getTypeSourceInfo();
4514 break;
4515 case TemplateArgument::Template:
4516 case TemplateArgument::TemplateExpansion: {
4517 // We have a template type parameter but the template argument
4518 // is a template without any arguments.
4519 SourceRange SR = AL.getSourceRange();
4520 TemplateName Name = Arg.getAsTemplateOrTemplatePattern();
4521 diagnoseMissingTemplateArguments(Name, SR.getEnd());
4522 return true;
4523 }
4524 case TemplateArgument::Expression: {
4525 // We have a template type parameter but the template argument is an
4526 // expression; see if maybe it is missing the "typename" keyword.
4527 CXXScopeSpec SS;
4528 DeclarationNameInfo NameInfo;
4529
4530 if (DeclRefExpr *ArgExpr = dyn_cast<DeclRefExpr>(Arg.getAsExpr())) {
4531 SS.Adopt(ArgExpr->getQualifierLoc());
4532 NameInfo = ArgExpr->getNameInfo();
4533 } else if (DependentScopeDeclRefExpr *ArgExpr =
4534 dyn_cast<DependentScopeDeclRefExpr>(Arg.getAsExpr())) {
4535 SS.Adopt(ArgExpr->getQualifierLoc());
4536 NameInfo = ArgExpr->getNameInfo();
4537 } else if (CXXDependentScopeMemberExpr *ArgExpr =
4538 dyn_cast<CXXDependentScopeMemberExpr>(Arg.getAsExpr())) {
4539 if (ArgExpr->isImplicitAccess()) {
4540 SS.Adopt(ArgExpr->getQualifierLoc());
4541 NameInfo = ArgExpr->getMemberNameInfo();
4542 }
4543 }
4544
4545 if (auto *II = NameInfo.getName().getAsIdentifierInfo()) {
4546 LookupResult Result(*this, NameInfo, LookupOrdinaryName);
4547 LookupParsedName(Result, CurScope, &SS);
4548
4549 if (Result.getAsSingle<TypeDecl>() ||
4550 Result.getResultKind() ==
4551 LookupResult::NotFoundInCurrentInstantiation) {
4552 // Suggest that the user add 'typename' before the NNS.
4553 SourceLocation Loc = AL.getSourceRange().getBegin();
4554 Diag(Loc, getLangOpts().MSVCCompat
4555 ? diag::ext_ms_template_type_arg_missing_typename
4556 : diag::err_template_arg_must_be_type_suggest)
4557 << FixItHint::CreateInsertion(Loc, "typename ");
4558 Diag(Param->getLocation(), diag::note_template_param_here);
4559
4560 // Recover by synthesizing a type using the location information that we
4561 // already have.
4562 ArgType =
4563 Context.getDependentNameType(ETK_Typename, SS.getScopeRep(), II);
4564 TypeLocBuilder TLB;
4565 DependentNameTypeLoc TL = TLB.push<DependentNameTypeLoc>(ArgType);
4566 TL.setElaboratedKeywordLoc(SourceLocation(/*synthesized*/));
4567 TL.setQualifierLoc(SS.getWithLocInContext(Context));
4568 TL.setNameLoc(NameInfo.getLoc());
4569 TSI = TLB.getTypeSourceInfo(Context, ArgType);
4570
4571 // Overwrite our input TemplateArgumentLoc so that we can recover
4572 // properly.
4573 AL = TemplateArgumentLoc(TemplateArgument(ArgType),
4574 TemplateArgumentLocInfo(TSI));
4575
4576 break;
4577 }
4578 }
4579 // fallthrough
4580 LLVM_FALLTHROUGH[[gnu::fallthrough]];
4581 }
4582 default: {
4583 // We have a template type parameter but the template argument
4584 // is not a type.
4585 SourceRange SR = AL.getSourceRange();
4586 Diag(SR.getBegin(), diag::err_template_arg_must_be_type) << SR;
4587 Diag(Param->getLocation(), diag::note_template_param_here);
4588
4589 return true;
4590 }
4591 }
4592
4593 if (CheckTemplateArgument(Param, TSI))
4594 return true;
4595
4596 // Add the converted template type argument.
4597 ArgType = Context.getCanonicalType(ArgType);
4598
4599 // Objective-C ARC:
4600 // If an explicitly-specified template argument type is a lifetime type
4601 // with no lifetime qualifier, the __strong lifetime qualifier is inferred.
4602 if (getLangOpts().ObjCAutoRefCount &&
4603 ArgType->isObjCLifetimeType() &&
4604 !ArgType.getObjCLifetime()) {
4605 Qualifiers Qs;
4606 Qs.setObjCLifetime(Qualifiers::OCL_Strong);
4607 ArgType = Context.getQualifiedType(ArgType, Qs);
4608 }
4609
4610 Converted.push_back(TemplateArgument(ArgType));
4611 return false;
4612}
4613
4614/// Substitute template arguments into the default template argument for
4615/// the given template type parameter.
4616///
4617/// \param SemaRef the semantic analysis object for which we are performing
4618/// the substitution.
4619///
4620/// \param Template the template that we are synthesizing template arguments
4621/// for.
4622///
4623/// \param TemplateLoc the location of the template name that started the
4624/// template-id we are checking.
4625///
4626/// \param RAngleLoc the location of the right angle bracket ('>') that
4627/// terminates the template-id.
4628///
4629/// \param Param the template template parameter whose default we are
4630/// substituting into.
4631///
4632/// \param Converted the list of template arguments provided for template
4633/// parameters that precede \p Param in the template parameter list.
4634/// \returns the substituted template argument, or NULL if an error occurred.
4635static TypeSourceInfo *
4636SubstDefaultTemplateArgument(Sema &SemaRef,
4637 TemplateDecl *Template,
4638 SourceLocation TemplateLoc,
4639 SourceLocation RAngleLoc,
4640 TemplateTypeParmDecl *Param,
4641 SmallVectorImpl<TemplateArgument> &Converted) {
4642 TypeSourceInfo *ArgType = Param->getDefaultArgumentInfo();
4643
4644 // If the argument type is dependent, instantiate it now based
4645 // on the previously-computed template arguments.
4646 if (ArgType->getType()->isInstantiationDependentType()) {
4647 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
4648 Param, Template, Converted,
4649 SourceRange(TemplateLoc, RAngleLoc));
4650 if (Inst.isInvalid())
4651 return nullptr;
4652
4653 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted);
4654
4655 // Only substitute for the innermost template argument list.
4656 MultiLevelTemplateArgumentList TemplateArgLists;
4657 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
4658 for (unsigned i = 0, e = Param->getDepth(); i != e; ++i)
4659 TemplateArgLists.addOuterTemplateArguments(None);
4660
4661 Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext());
4662 ArgType =
4663 SemaRef.SubstType(ArgType, TemplateArgLists,
4664 Param->getDefaultArgumentLoc(), Param->getDeclName());
4665 }
4666
4667 return ArgType;
4668}
4669
4670/// Substitute template arguments into the default template argument for
4671/// the given non-type template parameter.
4672///
4673/// \param SemaRef the semantic analysis object for which we are performing
4674/// the substitution.
4675///
4676/// \param Template the template that we are synthesizing template arguments
4677/// for.
4678///
4679/// \param TemplateLoc the location of the template name that started the
4680/// template-id we are checking.
4681///
4682/// \param RAngleLoc the location of the right angle bracket ('>') that
4683/// terminates the template-id.
4684///
4685/// \param Param the non-type template parameter whose default we are
4686/// substituting into.
4687///
4688/// \param Converted the list of template arguments provided for template
4689/// parameters that precede \p Param in the template parameter list.
4690///
4691/// \returns the substituted template argument, or NULL if an error occurred.
4692static ExprResult
4693SubstDefaultTemplateArgument(Sema &SemaRef,
4694 TemplateDecl *Template,
4695 SourceLocation TemplateLoc,
4696 SourceLocation RAngleLoc,
4697 NonTypeTemplateParmDecl *Param,
4698 SmallVectorImpl<TemplateArgument> &Converted) {
4699 Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc,
4700 Param, Template, Converted,
4701 SourceRange(TemplateLoc, RAngleLoc));
4702 if (Inst.isInvalid())
4703 return ExprError();
4704
4705 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted);
4706
4707 // Only substitute for the innermost template argument list.
4708 MultiLevelTemplateArgumentList TemplateArgLists;
4709 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
4710 for (unsigned i = 0, e = Param->getDepth(); i != e; ++i)
4711 TemplateArgLists.addOuterTemplateArguments(None);
4712
4713 Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext());
4714 EnterExpressionEvaluationContext ConstantEvaluated(
4715 SemaRef, Sema::ExpressionEvaluationContext::ConstantEvaluated);
4716 return SemaRef.SubstExpr(Param->getDefaultArgument(), TemplateArgLists);
4717}
4718
4719/// Substitute template arguments into the default template argument for
4720/// the given template template parameter.
4721///
4722/// \param SemaRef the semantic analysis object for which we are performing
4723/// the substitution.
4724///
4725/// \param Template the template that we are synthesizing template arguments
4726/// for.
4727///
4728/// \param TemplateLoc the location of the template name that started the
4729/// template-id we are checking.
4730///
4731/// \param RAngleLoc the location of the right angle bracket ('>') that
4732/// terminates the template-id.
4733///
4734/// \param Param the template template parameter whose default we are
4735/// substituting into.
4736///
4737/// \param Converted the list of template arguments provided for template
4738/// parameters that precede \p Param in the template parameter list.
4739///
4740/// \param QualifierLoc Will be set to the nested-name-specifier (with
4741/// source-location information) that precedes the template name.
4742///
4743/// \returns the substituted template argument, or NULL if an error occurred.
4744static TemplateName
4745SubstDefaultTemplateArgument(Sema &SemaRef,
4746 TemplateDecl *Template,
4747 SourceLocation TemplateLoc,
4748 SourceLocation RAngleLoc,
4749 TemplateTemplateParmDecl *Param,
4750 SmallVectorImpl<TemplateArgument> &Converted,
4751 NestedNameSpecifierLoc &QualifierLoc) {
4752 Sema::InstantiatingTemplate Inst(
4753 SemaRef, TemplateLoc, TemplateParameter(Param), Template, Converted,
4754 SourceRange(TemplateLoc, RAngleLoc));
4755 if (Inst.isInvalid())
4756 return TemplateName();
4757
4758 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted);
4759
4760 // Only substitute for the innermost template argument list.
4761 MultiLevelTemplateArgumentList TemplateArgLists;
4762 TemplateArgLists.addOuterTemplateArguments(&TemplateArgs);
4763 for (unsigned i = 0, e = Param->getDepth(); i != e; ++i)
4764 TemplateArgLists.addOuterTemplateArguments(None);
4765
4766 Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext());
4767 // Substitute into the nested-name-specifier first,
4768 QualifierLoc = Param->getDefaultArgument().getTemplateQualifierLoc();
4769 if (QualifierLoc) {
4770 QualifierLoc =
4771 SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, TemplateArgLists);
4772 if (!QualifierLoc)
4773 return TemplateName();
4774 }
4775
4776 return SemaRef.SubstTemplateName(
4777 QualifierLoc,
4778 Param->getDefaultArgument().getArgument().getAsTemplate(),
4779 Param->getDefaultArgument().getTemplateNameLoc(),
4780 TemplateArgLists);
4781}
4782
4783/// If the given template parameter has a default template
4784/// argument, substitute into that default template argument and
4785/// return the corresponding template argument.
4786TemplateArgumentLoc
4787Sema::SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template,
4788 SourceLocation TemplateLoc,
4789 SourceLocation RAngleLoc,
4790 Decl *Param,
4791 SmallVectorImpl<TemplateArgument>
4792 &Converted,
4793 bool &HasDefaultArg) {
4794 HasDefaultArg = false;
4795
4796 if (TemplateTypeParmDecl *TypeParm = dyn_cast<TemplateTypeParmDecl>(Param)) {
4797 if (!hasVisibleDefaultArgument(TypeParm))
4798 return TemplateArgumentLoc();
4799
4800 HasDefaultArg = true;
4801 TypeSourceInfo *DI = SubstDefaultTemplateArgument(*this, Template,
4802 TemplateLoc,
4803 RAngleLoc,
4804 TypeParm,
4805 Converted);
4806 if (DI)
4807 return TemplateArgumentLoc(TemplateArgument(DI->getType()), DI);
4808
4809 return TemplateArgumentLoc();
4810 }
4811
4812 if (NonTypeTemplateParmDecl *NonTypeParm
4813 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
4814 if (!hasVisibleDefaultArgument(NonTypeParm))
4815 return TemplateArgumentLoc();
4816
4817 HasDefaultArg = true;
4818 ExprResult Arg = SubstDefaultTemplateArgument(*this, Template,
4819 TemplateLoc,
4820 RAngleLoc,
4821 NonTypeParm,
4822 Converted);
4823 if (Arg.isInvalid())
4824 return TemplateArgumentLoc();
4825
4826 Expr *ArgE = Arg.getAs<Expr>();
4827 return TemplateArgumentLoc(TemplateArgument(ArgE), ArgE);
4828 }
4829
4830 TemplateTemplateParmDecl *TempTempParm
4831 = cast<TemplateTemplateParmDecl>(Param);
4832 if (!hasVisibleDefaultArgument(TempTempParm))
4833 return TemplateArgumentLoc();
4834
4835 HasDefaultArg = true;
4836 NestedNameSpecifierLoc QualifierLoc;
4837 TemplateName TName = SubstDefaultTemplateArgument(*this, Template,
4838 TemplateLoc,
4839 RAngleLoc,
4840 TempTempParm,
4841 Converted,
4842 QualifierLoc);
4843 if (TName.isNull())
4844 return TemplateArgumentLoc();
4845
4846 return TemplateArgumentLoc(TemplateArgument(TName),
4847 TempTempParm->getDefaultArgument().getTemplateQualifierLoc(),
4848 TempTempParm->getDefaultArgument().getTemplateNameLoc());
4849}
4850
4851/// Convert a template-argument that we parsed as a type into a template, if
4852/// possible. C++ permits injected-class-names to perform dual service as
4853/// template template arguments and as template type arguments.
4854static TemplateArgumentLoc convertTypeTemplateArgumentToTemplate(TypeLoc TLoc) {
4855 // Extract and step over any surrounding nested-name-specifier.
4856 NestedNameSpecifierLoc QualLoc;
4857 if (auto ETLoc = TLoc.getAs<ElaboratedTypeLoc>()) {
4858 if (ETLoc.getTypePtr()->getKeyword() != ETK_None)
4859 return TemplateArgumentLoc();
4860
4861 QualLoc = ETLoc.getQualifierLoc();
4862 TLoc = ETLoc.getNamedTypeLoc();
4863 }
4864
4865 // If this type was written as an injected-class-name, it can be used as a
4866 // template template argument.
4867 if (auto InjLoc = TLoc.getAs<InjectedClassNameTypeLoc>())
4868 return TemplateArgumentLoc(InjLoc.getTypePtr()->getTemplateName(),
4869 QualLoc, InjLoc.getNameLoc());
4870
4871 // If this type was written as an injected-class-name, it may have been
4872 // converted to a RecordType during instantiation. If the RecordType is
4873 // *not* wrapped in a TemplateSpecializationType and denotes a class
4874 // template specialization, it must have come from an injected-class-name.
4875 if (auto RecLoc = TLoc.getAs<RecordTypeLoc>())
4876 if (auto *CTSD =
4877 dyn_cast<ClassTemplateSpecializationDecl>(RecLoc.getDecl()))
4878 return TemplateArgumentLoc(TemplateName(CTSD->getSpecializedTemplate()),
4879 QualLoc, RecLoc.getNameLoc());
4880
4881 return TemplateArgumentLoc();
4882}
4883
4884/// Check that the given template argument corresponds to the given
4885/// template parameter.
4886///
4887/// \param Param The template parameter against which the argument will be
4888/// checked.
4889///
4890/// \param Arg The template argument, which may be updated due to conversions.
4891///
4892/// \param Template The template in which the template argument resides.
4893///
4894/// \param TemplateLoc The location of the template name for the template
4895/// whose argument list we're matching.
4896///
4897/// \param RAngleLoc The location of the right angle bracket ('>') that closes
4898/// the template argument list.
4899///
4900/// \param ArgumentPackIndex The index into the argument pack where this
4901/// argument will be placed. Only valid if the parameter is a parameter pack.
4902///
4903/// \param Converted The checked, converted argument will be added to the
4904/// end of this small vector.
4905///
4906/// \param CTAK Describes how we arrived at this particular template argument:
4907/// explicitly written, deduced, etc.
4908///
4909/// \returns true on error, false otherwise.
4910bool Sema::CheckTemplateArgument(NamedDecl *Param,
4911 TemplateArgumentLoc &Arg,
4912 NamedDecl *Template,
4913 SourceLocation TemplateLoc,
4914 SourceLocation RAngleLoc,
4915 unsigned ArgumentPackIndex,
4916 SmallVectorImpl<TemplateArgument> &Converted,
4917 CheckTemplateArgumentKind CTAK) {
4918 // Check template type parameters.
4919 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param))
4920 return CheckTemplateTypeArgument(TTP, Arg, Converted);
4921
4922 // Check non-type template parameters.
4923 if (NonTypeTemplateParmDecl *NTTP =dyn_cast<NonTypeTemplateParmDecl>(Param)) {
4924 // Do substitution on the type of the non-type template parameter
4925 // with the template arguments we've seen thus far. But if the
4926 // template has a dependent context then we cannot substitute yet.
4927 QualType NTTPType = NTTP->getType();
4928 if (NTTP->isParameterPack() && NTTP->isExpandedParameterPack())
4929 NTTPType = NTTP->getExpansionType(ArgumentPackIndex);
4930
4931 if (NTTPType->isInstantiationDependentType() &&
4932 !isa<TemplateTemplateParmDecl>(Template) &&
4933 !Template->getDeclContext()->isDependentContext()) {
4934 // Do substitution on the type of the non-type template parameter.
4935 InstantiatingTemplate Inst(*this, TemplateLoc, Template,
4936 NTTP, Converted,
4937 SourceRange(TemplateLoc, RAngleLoc));
4938 if (Inst.isInvalid())
4939 return true;
4940
4941 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack,
4942 Converted);
4943
4944 // If the parameter is a pack expansion, expand this slice of the pack.
4945 if (auto *PET = NTTPType->getAs<PackExpansionType>()) {
4946 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(*this,
4947 ArgumentPackIndex);
4948 NTTPType = SubstType(PET->getPattern(),
4949 MultiLevelTemplateArgumentList(TemplateArgs),
4950 NTTP->getLocation(),
4951 NTTP->getDeclName());
4952 } else {
4953 NTTPType = SubstType(NTTPType,
4954 MultiLevelTemplateArgumentList(TemplateArgs),
4955 NTTP->getLocation(),
4956 NTTP->getDeclName());
4957 }
4958
4959 // If that worked, check the non-type template parameter type
4960 // for validity.
4961 if (!NTTPType.isNull())
4962 NTTPType = CheckNonTypeTemplateParameterType(NTTPType,
4963 NTTP->getLocation());
4964 if (NTTPType.isNull())
4965 return true;
4966 }
4967
4968 switch (Arg.getArgument().getKind()) {
4969 case TemplateArgument::Null:
4970 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-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 4970)
;
4971
4972 case TemplateArgument::Expression: {
4973 TemplateArgument Result;
4974 unsigned CurSFINAEErrors = NumSFINAEErrors;
4975 ExprResult Res =
4976 CheckTemplateArgument(NTTP, NTTPType, Arg.getArgument().getAsExpr(),
4977 Result, CTAK);
4978 if (Res.isInvalid())
4979 return true;
4980 // If the current template argument causes an error, give up now.
4981 if (CurSFINAEErrors < NumSFINAEErrors)
4982 return true;
4983
4984 // If the resulting expression is new, then use it in place of the
4985 // old expression in the template argument.
4986 if (Res.get() != Arg.getArgument().getAsExpr()) {
4987 TemplateArgument TA(Res.get());
4988 Arg = TemplateArgumentLoc(TA, Res.get());
4989 }
4990
4991 Converted.push_back(Result);
4992 break;
4993 }
4994
4995 case TemplateArgument::Declaration:
4996 case TemplateArgument::Integral:
4997 case TemplateArgument::NullPtr:
4998 // We've already checked this template argument, so just copy
4999 // it to the list of converted arguments.
5000 Converted.push_back(Arg.getArgument());
5001 break;
5002
5003 case TemplateArgument::Template:
5004 case TemplateArgument::TemplateExpansion:
5005 // We were given a template template argument. It may not be ill-formed;
5006 // see below.
5007 if (DependentTemplateName *DTN
5008 = Arg.getArgument().getAsTemplateOrTemplatePattern()
5009 .getAsDependentTemplateName()) {
5010 // We have a template argument such as \c T::template X, which we
5011 // parsed as a template template argument. However, since we now
5012 // know that we need a non-type template argument, convert this
5013 // template name into an expression.
5014
5015 DeclarationNameInfo NameInfo(DTN->getIdentifier(),
5016 Arg.getTemplateNameLoc());
5017
5018 CXXScopeSpec SS;
5019 SS.Adopt(Arg.getTemplateQualifierLoc());
5020 // FIXME: the template-template arg was a DependentTemplateName,
5021 // so it was provided with a template keyword. However, its source
5022 // location is not stored in the template argument structure.
5023 SourceLocation TemplateKWLoc;
5024 ExprResult E = DependentScopeDeclRefExpr::Create(
5025 Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo,
5026 nullptr);
5027
5028 // If we parsed the template argument as a pack expansion, create a
5029 // pack expansion expression.
5030 if (Arg.getArgument().getKind() == TemplateArgument::TemplateExpansion){
5031 E = ActOnPackExpansion(E.get(), Arg.getTemplateEllipsisLoc());
5032 if (E.isInvalid())
5033 return true;
5034 }
5035
5036 TemplateArgument Result;
5037 E = CheckTemplateArgument(NTTP, NTTPType, E.get(), Result);
5038 if (E.isInvalid())
5039 return true;
5040
5041 Converted.push_back(Result);
5042 break;
5043 }
5044
5045 // We have a template argument that actually does refer to a class
5046 // template, alias template, or template template parameter, and
5047 // therefore cannot be a non-type template argument.
5048 Diag(Arg.getLocation(), diag::err_template_arg_must_be_expr)
5049 << Arg.getSourceRange();
5050
5051 Diag(Param->getLocation(), diag::note_template_param_here);
5052 return true;
5053
5054 case TemplateArgument::Type: {
5055 // We have a non-type template parameter but the template
5056 // argument is a type.
5057
5058 // C++ [temp.arg]p2:
5059 // In a template-argument, an ambiguity between a type-id and
5060 // an expression is resolved to a type-id, regardless of the
5061 // form of the corresponding template-parameter.
5062 //
5063 // We warn specifically about this case, since it can be rather
5064 // confusing for users.
5065 QualType T = Arg.getArgument().getAsType();
5066 SourceRange SR = Arg.getSourceRange();
5067 if (T->isFunctionType())
5068 Diag(SR.getBegin(), diag::err_template_arg_nontype_ambig) << SR << T;
5069 else
5070 Diag(SR.getBegin(), diag::err_template_arg_must_be_expr) << SR;
5071 Diag(Param->getLocation(), diag::note_template_param_here);
5072 return true;
5073 }
5074
5075 case TemplateArgument::Pack:
5076 llvm_unreachable("Caller must expand template argument packs")::llvm::llvm_unreachable_internal("Caller must expand template argument packs"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5076)
;
5077 }
5078
5079 return false;
5080 }
5081
5082
5083 // Check template template parameters.
5084 TemplateTemplateParmDecl *TempParm = cast<TemplateTemplateParmDecl>(Param);
5085
5086 TemplateParameterList *Params = TempParm->getTemplateParameters();
5087 if (TempParm->isExpandedParameterPack())
5088 Params = TempParm->getExpansionTemplateParameters(ArgumentPackIndex);
5089
5090 // Substitute into the template parameter list of the template
5091 // template parameter, since previously-supplied template arguments
5092 // may appear within the template template parameter.
5093 //
5094 // FIXME: Skip this if the parameters aren't instantiation-dependent.
5095 {
5096 // Set up a template instantiation context.
5097 LocalInstantiationScope Scope(*this);
5098 InstantiatingTemplate Inst(*this, TemplateLoc, Template,
5099 TempParm, Converted,
5100 SourceRange(TemplateLoc, RAngleLoc));
5101 if (Inst.isInvalid())
5102 return true;
5103
5104 TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted);
5105 Params = SubstTemplateParams(Params, CurContext,
5106 MultiLevelTemplateArgumentList(TemplateArgs));
5107 if (!Params)
5108 return true;
5109 }
5110
5111 // C++1z [temp.local]p1: (DR1004)
5112 // When [the injected-class-name] is used [...] as a template-argument for
5113 // a template template-parameter [...] it refers to the class template
5114 // itself.
5115 if (Arg.getArgument().getKind() == TemplateArgument::Type) {
5116 TemplateArgumentLoc ConvertedArg = convertTypeTemplateArgumentToTemplate(
5117 Arg.getTypeSourceInfo()->getTypeLoc());
5118 if (!ConvertedArg.getArgument().isNull())
5119 Arg = ConvertedArg;
5120 }
5121
5122 switch (Arg.getArgument().getKind()) {
5123 case TemplateArgument::Null:
5124 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-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5124)
;
5125
5126 case TemplateArgument::Template:
5127 case TemplateArgument::TemplateExpansion:
5128 if (CheckTemplateTemplateArgument(Params, Arg))
5129 return true;
5130
5131 Converted.push_back(Arg.getArgument());
5132 break;
5133
5134 case TemplateArgument::Expression:
5135 case TemplateArgument::Type:
5136 // We have a template template parameter but the template
5137 // argument does not refer to a template.
5138 Diag(Arg.getLocation(), diag::err_template_arg_must_be_template)
5139 << getLangOpts().CPlusPlus11;
5140 return true;
5141
5142 case TemplateArgument::Declaration:
5143 llvm_unreachable("Declaration argument with template template parameter")::llvm::llvm_unreachable_internal("Declaration argument with template template parameter"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5143)
;
5144 case TemplateArgument::Integral:
5145 llvm_unreachable("Integral argument with template template parameter")::llvm::llvm_unreachable_internal("Integral argument with template template parameter"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5145)
;
5146 case TemplateArgument::NullPtr:
5147 llvm_unreachable("Null pointer argument with template template parameter")::llvm::llvm_unreachable_internal("Null pointer argument with template template parameter"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5147)
;
5148
5149 case TemplateArgument::Pack:
5150 llvm_unreachable("Caller must expand template argument packs")::llvm::llvm_unreachable_internal("Caller must expand template argument packs"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5150)
;
5151 }
5152
5153 return false;
5154}
5155
5156/// Check whether the template parameter is a pack expansion, and if so,
5157/// determine the number of parameters produced by that expansion. For instance:
5158///
5159/// \code
5160/// template<typename ...Ts> struct A {
5161/// template<Ts ...NTs, template<Ts> class ...TTs, typename ...Us> struct B;
5162/// };
5163/// \endcode
5164///
5165/// In \c A<int,int>::B, \c NTs and \c TTs have expanded pack size 2, and \c Us
5166/// is not a pack expansion, so returns an empty Optional.
5167static Optional<unsigned> getExpandedPackSize(NamedDecl *Param) {
5168 if (NonTypeTemplateParmDecl *NTTP
5169 = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
5170 if (NTTP->isExpandedParameterPack())
5171 return NTTP->getNumExpansionTypes();
5172 }
5173
5174 if (TemplateTemplateParmDecl *TTP
5175 = dyn_cast<TemplateTemplateParmDecl>(Param)) {
5176 if (TTP->isExpandedParameterPack())
5177 return TTP->getNumExpansionTemplateParameters();
5178 }
5179
5180 return None;
5181}
5182
5183/// Diagnose a missing template argument.
5184template<typename TemplateParmDecl>
5185static bool diagnoseMissingArgument(Sema &S, SourceLocation Loc,
5186 TemplateDecl *TD,
5187 const TemplateParmDecl *D,
5188 TemplateArgumentListInfo &Args) {
5189 // Dig out the most recent declaration of the template parameter; there may be
5190 // declarations of the template that are more recent than TD.
5191 D = cast<TemplateParmDecl>(cast<TemplateDecl>(TD->getMostRecentDecl())
5192 ->getTemplateParameters()
5193 ->getParam(D->getIndex()));
5194
5195 // If there's a default argument that's not visible, diagnose that we're
5196 // missing a module import.
5197 llvm::SmallVector<Module*, 8> Modules;
5198 if (D->hasDefaultArgument() && !S.hasVisibleDefaultArgument(D, &Modules)) {
5199 S.diagnoseMissingImport(Loc, cast<NamedDecl>(TD),
5200 D->getDefaultArgumentLoc(), Modules,
5201 Sema::MissingImportKind::DefaultArgument,
5202 /*Recover*/true);
5203 return true;
5204 }
5205
5206 // FIXME: If there's a more recent default argument that *is* visible,
5207 // diagnose that it was declared too late.
5208
5209 TemplateParameterList *Params = TD->getTemplateParameters();
5210
5211 S.Diag(Loc, diag::err_template_arg_list_different_arity)
5212 << /*not enough args*/0
5213 << (int)S.getTemplateNameKindForDiagnostics(TemplateName(TD))
5214 << TD;
5215 S.Diag(TD->getLocation(), diag::note_template_decl_here)
5216 << Params->getSourceRange();
5217 return true;
5218}
5219
5220/// Check that the given template argument list is well-formed
5221/// for specializing the given template.
5222bool Sema::CheckTemplateArgumentList(
5223 TemplateDecl *Template, SourceLocation TemplateLoc,
5224 TemplateArgumentListInfo &TemplateArgs, bool PartialTemplateArgs,
5225 SmallVectorImpl<TemplateArgument> &Converted,
5226 bool UpdateArgsWithConversions) {
5227 // Make a copy of the template arguments for processing. Only make the
5228 // changes at the end when successful in matching the arguments to the
5229 // template.
5230 TemplateArgumentListInfo NewArgs = TemplateArgs;
5231
5232 // Make sure we get the template parameter list from the most
5233 // recentdeclaration, since that is the only one that has is guaranteed to
5234 // have all the default template argument information.
5235 TemplateParameterList *Params =
5236 cast<TemplateDecl>(Template->getMostRecentDecl())
5237 ->getTemplateParameters();
5238
5239 SourceLocation RAngleLoc = NewArgs.getRAngleLoc();
5240
5241 // C++ [temp.arg]p1:
5242 // [...] The type and form of each template-argument specified in
5243 // a template-id shall match the type and form specified for the
5244 // corresponding parameter declared by the template in its
5245 // template-parameter-list.
5246 bool isTemplateTemplateParameter = isa<TemplateTemplateParmDecl>(Template);
5247 SmallVector<TemplateArgument, 2> ArgumentPack;
5248 unsigned ArgIdx = 0, NumArgs = NewArgs.size();
5249 LocalInstantiationScope InstScope(*this, true);
5250 for (TemplateParameterList::iterator Param = Params->begin(),
5251 ParamEnd = Params->end();
5252 Param != ParamEnd; /* increment in loop */) {
5253 // If we have an expanded parameter pack, make sure we don't have too
5254 // many arguments.
5255 if (Optional<unsigned> Expansions = getExpandedPackSize(*Param)) {
5256 if (*Expansions == ArgumentPack.size()) {
5257 // We're done with this parameter pack. Pack up its arguments and add
5258 // them to the list.
5259 Converted.push_back(
5260 TemplateArgument::CreatePackCopy(Context, ArgumentPack));
5261 ArgumentPack.clear();
5262
5263 // This argument is assigned to the next parameter.
5264 ++Param;
5265 continue;
5266 } else if (ArgIdx == NumArgs && !PartialTemplateArgs) {
5267 // Not enough arguments for this parameter pack.
5268 Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
5269 << /*not enough args*/0
5270 << (int)getTemplateNameKindForDiagnostics(TemplateName(Template))
5271 << Template;
5272 Diag(Template->getLocation(), diag::note_template_decl_here)
5273 << Params->getSourceRange();
5274 return true;
5275 }
5276 }
5277
5278 if (ArgIdx < NumArgs) {
5279 // Check the template argument we were given.
5280 if (CheckTemplateArgument(*Param, NewArgs[ArgIdx], Template,
5281 TemplateLoc, RAngleLoc,
5282 ArgumentPack.size(), Converted))
5283 return true;
5284
5285 bool PackExpansionIntoNonPack =
5286 NewArgs[ArgIdx].getArgument().isPackExpansion() &&
5287 (!(*Param)->isTemplateParameterPack() || getExpandedPackSize(*Param));
5288 if (PackExpansionIntoNonPack && isa<TypeAliasTemplateDecl>(Template)) {
5289 // Core issue 1430: we have a pack expansion as an argument to an
5290 // alias template, and it's not part of a parameter pack. This
5291 // can't be canonicalized, so reject it now.
5292 Diag(NewArgs[ArgIdx].getLocation(),
5293 diag::err_alias_template_expansion_into_fixed_list)
5294 << NewArgs[ArgIdx].getSourceRange();
5295 Diag((*Param)->getLocation(), diag::note_template_param_here);
5296 return true;
5297 }
5298
5299 // We're now done with this argument.
5300 ++ArgIdx;
5301
5302 if ((*Param)->isTemplateParameterPack()) {
5303 // The template parameter was a template parameter pack, so take the
5304 // deduced argument and place it on the argument pack. Note that we
5305 // stay on the same template parameter so that we can deduce more
5306 // arguments.
5307 ArgumentPack.push_back(Converted.pop_back_val());
5308 } else {
5309 // Move to the next template parameter.
5310 ++Param;
5311 }
5312
5313 // If we just saw a pack expansion into a non-pack, then directly convert
5314 // the remaining arguments, because we don't know what parameters they'll
5315 // match up with.
5316 if (PackExpansionIntoNonPack) {
5317 if (!ArgumentPack.empty()) {
5318 // If we were part way through filling in an expanded parameter pack,
5319 // fall back to just producing individual arguments.
5320 Converted.insert(Converted.end(),
5321 ArgumentPack.begin(), ArgumentPack.end());
5322 ArgumentPack.clear();
5323 }
5324
5325 while (ArgIdx < NumArgs) {
5326 Converted.push_back(NewArgs[ArgIdx].getArgument());
5327 ++ArgIdx;
5328 }
5329
5330 return false;
5331 }
5332
5333 continue;
5334 }
5335
5336 // If we're checking a partial template argument list, we're done.
5337 if (PartialTemplateArgs) {
5338 if ((*Param)->isTemplateParameterPack() && !ArgumentPack.empty())
5339 Converted.push_back(
5340 TemplateArgument::CreatePackCopy(Context, ArgumentPack));
5341
5342 return false;
5343 }
5344
5345 // If we have a template parameter pack with no more corresponding
5346 // arguments, just break out now and we'll fill in the argument pack below.
5347 if ((*Param)->isTemplateParameterPack()) {
5348 assert(!getExpandedPackSize(*Param) &&((!getExpandedPackSize(*Param) && "Should have dealt with this already"
) ? static_cast<void> (0) : __assert_fail ("!getExpandedPackSize(*Param) && \"Should have dealt with this already\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5349, __PRETTY_FUNCTION__))
5349 "Should have dealt with this already")((!getExpandedPackSize(*Param) && "Should have dealt with this already"
) ? static_cast<void> (0) : __assert_fail ("!getExpandedPackSize(*Param) && \"Should have dealt with this already\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5349, __PRETTY_FUNCTION__))
;
5350
5351 // A non-expanded parameter pack before the end of the parameter list
5352 // only occurs for an ill-formed template parameter list, unless we've
5353 // got a partial argument list for a function template, so just bail out.
5354 if (Param + 1 != ParamEnd)
5355 return true;
5356
5357 Converted.push_back(
5358 TemplateArgument::CreatePackCopy(Context, ArgumentPack));
5359 ArgumentPack.clear();
5360
5361 ++Param;
5362 continue;
5363 }
5364
5365 // Check whether we have a default argument.
5366 TemplateArgumentLoc Arg;
5367
5368 // Retrieve the default template argument from the template
5369 // parameter. For each kind of template parameter, we substitute the
5370 // template arguments provided thus far and any "outer" template arguments
5371 // (when the template parameter was part of a nested template) into
5372 // the default argument.
5373 if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*Param)) {
5374 if (!hasVisibleDefaultArgument(TTP))
5375 return diagnoseMissingArgument(*this, TemplateLoc, Template, TTP,
5376 NewArgs);
5377
5378 TypeSourceInfo *ArgType = SubstDefaultTemplateArgument(*this,
5379 Template,
5380 TemplateLoc,
5381 RAngleLoc,
5382 TTP,
5383 Converted);
5384 if (!ArgType)
5385 return true;
5386
5387 Arg = TemplateArgumentLoc(TemplateArgument(ArgType->getType()),
5388 ArgType);
5389 } else if (NonTypeTemplateParmDecl *NTTP
5390 = dyn_cast<NonTypeTemplateParmDecl>(*Param)) {
5391 if (!hasVisibleDefaultArgument(NTTP))
5392 return diagnoseMissingArgument(*this, TemplateLoc, Template, NTTP,
5393 NewArgs);
5394
5395 ExprResult E = SubstDefaultTemplateArgument(*this, Template,
5396 TemplateLoc,
5397 RAngleLoc,
5398 NTTP,
5399 Converted);
5400 if (E.isInvalid())
5401 return true;
5402
5403 Expr *Ex = E.getAs<Expr>();
5404 Arg = TemplateArgumentLoc(TemplateArgument(Ex), Ex);
5405 } else {
5406 TemplateTemplateParmDecl *TempParm
5407 = cast<TemplateTemplateParmDecl>(*Param);
5408
5409 if (!hasVisibleDefaultArgument(TempParm))
5410 return diagnoseMissingArgument(*this, TemplateLoc, Template, TempParm,
5411 NewArgs);
5412
5413 NestedNameSpecifierLoc QualifierLoc;
5414 TemplateName Name = SubstDefaultTemplateArgument(*this, Template,
5415 TemplateLoc,
5416 RAngleLoc,
5417 TempParm,
5418 Converted,
5419 QualifierLoc);
5420 if (Name.isNull())
5421 return true;
5422
5423 Arg = TemplateArgumentLoc(TemplateArgument(Name), QualifierLoc,
5424 TempParm->getDefaultArgument().getTemplateNameLoc());
5425 }
5426
5427 // Introduce an instantiation record that describes where we are using
5428 // the default template argument. We're not actually instantiating a
5429 // template here, we just create this object to put a note into the
5430 // context stack.
5431 InstantiatingTemplate Inst(*this, RAngleLoc, Template, *Param, Converted,
5432 SourceRange(TemplateLoc, RAngleLoc));
5433 if (Inst.isInvalid())
5434 return true;
5435
5436 // Check the default template argument.
5437 if (CheckTemplateArgument(*Param, Arg, Template, TemplateLoc,
5438 RAngleLoc, 0, Converted))
5439 return true;
5440
5441 // Core issue 150 (assumed resolution): if this is a template template
5442 // parameter, keep track of the default template arguments from the
5443 // template definition.
5444 if (isTemplateTemplateParameter)
5445 NewArgs.addArgument(Arg);
5446
5447 // Move to the next template parameter and argument.
5448 ++Param;
5449 ++ArgIdx;
5450 }
5451
5452 // If we're performing a partial argument substitution, allow any trailing
5453 // pack expansions; they might be empty. This can happen even if
5454 // PartialTemplateArgs is false (the list of arguments is complete but
5455 // still dependent).
5456 if (ArgIdx < NumArgs && CurrentInstantiationScope &&
5457 CurrentInstantiationScope->getPartiallySubstitutedPack()) {
5458 while (ArgIdx < NumArgs && NewArgs[ArgIdx].getArgument().isPackExpansion())
5459 Converted.push_back(NewArgs[ArgIdx++].getArgument());
5460 }
5461
5462 // If we have any leftover arguments, then there were too many arguments.
5463 // Complain and fail.
5464 if (ArgIdx < NumArgs) {
5465 Diag(TemplateLoc, diag::err_template_arg_list_different_arity)
5466 << /*too many args*/1
5467 << (int)getTemplateNameKindForDiagnostics(TemplateName(Template))
5468 << Template
5469 << SourceRange(NewArgs[ArgIdx].getLocation(), NewArgs.getRAngleLoc());
5470 Diag(Template->getLocation(), diag::note_template_decl_here)
5471 << Params->getSourceRange();
5472 return true;
5473 }
5474
5475 // No problems found with the new argument list, propagate changes back
5476 // to caller.
5477 if (UpdateArgsWithConversions)
5478 TemplateArgs = std::move(NewArgs);
5479
5480 return false;
5481}
5482
5483namespace {
5484 class UnnamedLocalNoLinkageFinder
5485 : public TypeVisitor<UnnamedLocalNoLinkageFinder, bool>
5486 {
5487 Sema &S;
5488 SourceRange SR;
5489
5490 typedef TypeVisitor<UnnamedLocalNoLinkageFinder, bool> inherited;
5491
5492 public:
5493 UnnamedLocalNoLinkageFinder(Sema &S, SourceRange SR) : S(S), SR(SR) { }
5494
5495 bool Visit(QualType T) {
5496 return T.isNull() ? false : inherited::Visit(T.getTypePtr());
5497 }
5498
5499#define TYPE(Class, Parent) \
5500 bool Visit##Class##Type(const Class##Type *);
5501#define ABSTRACT_TYPE(Class, Parent) \
5502 bool Visit##Class##Type(const Class##Type *) { return false; }
5503#define NON_CANONICAL_TYPE(Class, Parent) \
5504 bool Visit##Class##Type(const Class##Type *) { return false; }
5505#include "clang/AST/TypeNodes.inc"
5506
5507 bool VisitTagDecl(const TagDecl *Tag);
5508 bool VisitNestedNameSpecifier(NestedNameSpecifier *NNS);
5509 };
5510} // end anonymous namespace
5511
5512bool UnnamedLocalNoLinkageFinder::VisitBuiltinType(const BuiltinType*) {
5513 return false;
5514}
5515
5516bool UnnamedLocalNoLinkageFinder::VisitComplexType(const ComplexType* T) {
5517 return Visit(T->getElementType());
5518}
5519
5520bool UnnamedLocalNoLinkageFinder::VisitPointerType(const PointerType* T) {
5521 return Visit(T->getPointeeType());
5522}
5523
5524bool UnnamedLocalNoLinkageFinder::VisitBlockPointerType(
5525 const BlockPointerType* T) {
5526 return Visit(T->getPointeeType());
5527}
5528
5529bool UnnamedLocalNoLinkageFinder::VisitLValueReferenceType(
5530 const LValueReferenceType* T) {
5531 return Visit(T->getPointeeType());
5532}
5533
5534bool UnnamedLocalNoLinkageFinder::VisitRValueReferenceType(
5535 const RValueReferenceType* T) {
5536 return Visit(T->getPointeeType());
5537}
5538
5539bool UnnamedLocalNoLinkageFinder::VisitMemberPointerType(
5540 const MemberPointerType* T) {
5541 return Visit(T->getPointeeType()) || Visit(QualType(T->getClass(), 0));
5542}
5543
5544bool UnnamedLocalNoLinkageFinder::VisitConstantArrayType(
5545 const ConstantArrayType* T) {
5546 return Visit(T->getElementType());
5547}
5548
5549bool UnnamedLocalNoLinkageFinder::VisitIncompleteArrayType(
5550 const IncompleteArrayType* T) {
5551 return Visit(T->getElementType());
5552}
5553
5554bool UnnamedLocalNoLinkageFinder::VisitVariableArrayType(
5555 const VariableArrayType* T) {
5556 return Visit(T->getElementType());
5557}
5558
5559bool UnnamedLocalNoLinkageFinder::VisitDependentSizedArrayType(
5560 const DependentSizedArrayType* T) {
5561 return Visit(T->getElementType());
5562}
5563
5564bool UnnamedLocalNoLinkageFinder::VisitDependentSizedExtVectorType(
5565 const DependentSizedExtVectorType* T) {
5566 return Visit(T->getElementType());
5567}
5568
5569bool UnnamedLocalNoLinkageFinder::VisitDependentAddressSpaceType(
5570 const DependentAddressSpaceType *T) {
5571 return Visit(T->getPointeeType());
5572}
5573
5574bool UnnamedLocalNoLinkageFinder::VisitVectorType(const VectorType* T) {
5575 return Visit(T->getElementType());
5576}
5577
5578bool UnnamedLocalNoLinkageFinder::VisitDependentVectorType(
5579 const DependentVectorType *T) {
5580 return Visit(T->getElementType());
5581}
5582
5583bool UnnamedLocalNoLinkageFinder::VisitExtVectorType(const ExtVectorType* T) {
5584 return Visit(T->getElementType());
5585}
5586
5587bool UnnamedLocalNoLinkageFinder::VisitFunctionProtoType(
5588 const FunctionProtoType* T) {
5589 for (const auto &A : T->param_types()) {
5590 if (Visit(A))
5591 return true;
5592 }
5593
5594 return Visit(T->getReturnType());
5595}
5596
5597bool UnnamedLocalNoLinkageFinder::VisitFunctionNoProtoType(
5598 const FunctionNoProtoType* T) {
5599 return Visit(T->getReturnType());
5600}
5601
5602bool UnnamedLocalNoLinkageFinder::VisitUnresolvedUsingType(
5603 const UnresolvedUsingType*) {
5604 return false;
5605}
5606
5607bool UnnamedLocalNoLinkageFinder::VisitTypeOfExprType(const TypeOfExprType*) {
5608 return false;
5609}
5610
5611bool UnnamedLocalNoLinkageFinder::VisitTypeOfType(const TypeOfType* T) {
5612 return Visit(T->getUnderlyingType());
5613}
5614
5615bool UnnamedLocalNoLinkageFinder::VisitDecltypeType(const DecltypeType*) {
5616 return false;
5617}
5618
5619bool UnnamedLocalNoLinkageFinder::VisitUnaryTransformType(
5620 const UnaryTransformType*) {
5621 return false;
5622}
5623
5624bool UnnamedLocalNoLinkageFinder::VisitAutoType(const AutoType *T) {
5625 return Visit(T->getDeducedType());
5626}
5627
5628bool UnnamedLocalNoLinkageFinder::VisitDeducedTemplateSpecializationType(
5629 const DeducedTemplateSpecializationType *T) {
5630 return Visit(T->getDeducedType());
5631}
5632
5633bool UnnamedLocalNoLinkageFinder::VisitRecordType(const RecordType* T) {
5634 return VisitTagDecl(T->getDecl());
5635}
5636
5637bool UnnamedLocalNoLinkageFinder::VisitEnumType(const EnumType* T) {
5638 return VisitTagDecl(T->getDecl());
5639}
5640
5641bool UnnamedLocalNoLinkageFinder::VisitTemplateTypeParmType(
5642 const TemplateTypeParmType*) {
5643 return false;
5644}
5645
5646bool UnnamedLocalNoLinkageFinder::VisitSubstTemplateTypeParmPackType(
5647 const SubstTemplateTypeParmPackType *) {
5648 return false;
5649}
5650
5651bool UnnamedLocalNoLinkageFinder::VisitTemplateSpecializationType(
5652 const TemplateSpecializationType*) {
5653 return false;
5654}
5655
5656bool UnnamedLocalNoLinkageFinder::VisitInjectedClassNameType(
5657 const InjectedClassNameType* T) {
5658 return VisitTagDecl(T->getDecl());
5659}
5660
5661bool UnnamedLocalNoLinkageFinder::VisitDependentNameType(
5662 const DependentNameType* T) {
5663 return VisitNestedNameSpecifier(T->getQualifier());
5664}
5665
5666bool UnnamedLocalNoLinkageFinder::VisitDependentTemplateSpecializationType(
5667 const DependentTemplateSpecializationType* T) {
5668 return VisitNestedNameSpecifier(T->getQualifier());
5669}
5670
5671bool UnnamedLocalNoLinkageFinder::VisitPackExpansionType(
5672 const PackExpansionType* T) {
5673 return Visit(T->getPattern());
5674}
5675
5676bool UnnamedLocalNoLinkageFinder::VisitObjCObjectType(const ObjCObjectType *) {
5677 return false;
5678}
5679
5680bool UnnamedLocalNoLinkageFinder::VisitObjCInterfaceType(
5681 const ObjCInterfaceType *) {
5682 return false;
5683}
5684
5685bool UnnamedLocalNoLinkageFinder::VisitObjCObjectPointerType(
5686 const ObjCObjectPointerType *) {
5687 return false;
5688}
5689
5690bool UnnamedLocalNoLinkageFinder::VisitAtomicType(const AtomicType* T) {
5691 return Visit(T->getValueType());
5692}
5693
5694bool UnnamedLocalNoLinkageFinder::VisitPipeType(const PipeType* T) {
5695 return false;
5696}
5697
5698bool UnnamedLocalNoLinkageFinder::VisitTagDecl(const TagDecl *Tag) {
5699 if (Tag->getDeclContext()->isFunctionOrMethod()) {
5700 S.Diag(SR.getBegin(),
5701 S.getLangOpts().CPlusPlus11 ?
5702 diag::warn_cxx98_compat_template_arg_local_type :
5703 diag::ext_template_arg_local_type)
5704 << S.Context.getTypeDeclType(Tag) << SR;
5705 return true;
5706 }
5707
5708 if (!Tag->hasNameForLinkage()) {
5709 S.Diag(SR.getBegin(),
5710 S.getLangOpts().CPlusPlus11 ?
5711 diag::warn_cxx98_compat_template_arg_unnamed_type :
5712 diag::ext_template_arg_unnamed_type) << SR;
5713 S.Diag(Tag->getLocation(), diag::note_template_unnamed_type_here);
5714 return true;
5715 }
5716
5717 return false;
5718}
5719
5720bool UnnamedLocalNoLinkageFinder::VisitNestedNameSpecifier(
5721 NestedNameSpecifier *NNS) {
5722 if (NNS->getPrefix() && VisitNestedNameSpecifier(NNS->getPrefix()))
5723 return true;
5724
5725 switch (NNS->getKind()) {
5726 case NestedNameSpecifier::Identifier:
5727 case NestedNameSpecifier::Namespace:
5728 case NestedNameSpecifier::NamespaceAlias:
5729 case NestedNameSpecifier::Global:
5730 case NestedNameSpecifier::Super:
5731 return false;
5732
5733 case NestedNameSpecifier::TypeSpec:
5734 case NestedNameSpecifier::TypeSpecWithTemplate:
5735 return Visit(QualType(NNS->getAsType(), 0));
5736 }
5737 llvm_unreachable("Invalid NestedNameSpecifier::Kind!")::llvm::llvm_unreachable_internal("Invalid NestedNameSpecifier::Kind!"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5737)
;
5738}
5739
5740/// Check a template argument against its corresponding
5741/// template type parameter.
5742///
5743/// This routine implements the semantics of C++ [temp.arg.type]. It
5744/// returns true if an error occurred, and false otherwise.
5745bool Sema::CheckTemplateArgument(TemplateTypeParmDecl *Param,
5746 TypeSourceInfo *ArgInfo) {
5747 assert(ArgInfo && "invalid TypeSourceInfo")((ArgInfo && "invalid TypeSourceInfo") ? static_cast<
void> (0) : __assert_fail ("ArgInfo && \"invalid TypeSourceInfo\""
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5747, __PRETTY_FUNCTION__))
;
5748 QualType Arg = ArgInfo->getType();
5749 SourceRange SR = ArgInfo->getTypeLoc().getSourceRange();
5750
5751 if (Arg->isVariablyModifiedType()) {
5752 return Diag(SR.getBegin(), diag::err_variably_modified_template_arg) << Arg;
5753 } else if (Context.hasSameUnqualifiedType(Arg, Context.OverloadTy)) {
5754 return Diag(SR.getBegin(), diag::err_template_arg_overload_type) << SR;
5755 }
5756
5757 // C++03 [temp.arg.type]p2:
5758 // A local type, a type with no linkage, an unnamed type or a type
5759 // compounded from any of these types shall not be used as a
5760 // template-argument for a template type-parameter.
5761 //
5762 // C++11 allows these, and even in C++03 we allow them as an extension with
5763 // a warning.
5764 if (LangOpts.CPlusPlus11 || Arg->hasUnnamedOrLocalType()) {
5765 UnnamedLocalNoLinkageFinder Finder(*this, SR);
5766 (void)Finder.Visit(Context.getCanonicalType(Arg));
5767 }
5768
5769 return false;
5770}
5771
5772enum NullPointerValueKind {
5773 NPV_NotNullPointer,
5774 NPV_NullPointer,
5775 NPV_Error
5776};
5777
5778/// Determine whether the given template argument is a null pointer
5779/// value of the appropriate type.
5780static NullPointerValueKind
5781isNullPointerValueTemplateArgument(Sema &S, NonTypeTemplateParmDecl *Param,
5782 QualType ParamType, Expr *Arg,
5783 Decl *Entity = nullptr) {
5784 if (Arg->isValueDependent() || Arg->isTypeDependent())
5785 return NPV_NotNullPointer;
5786
5787 // dllimport'd entities aren't constant but are available inside of template
5788 // arguments.
5789 if (Entity && Entity->hasAttr<DLLImportAttr>())
5790 return NPV_NotNullPointer;
5791
5792 if (!S.isCompleteType(Arg->getExprLoc(), ParamType))
5793 llvm_unreachable(::llvm::llvm_unreachable_internal("Incomplete parameter type in isNullPointerValueTemplateArgument!"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5794)
5794 "Incomplete parameter type in isNullPointerValueTemplateArgument!")::llvm::llvm_unreachable_internal("Incomplete parameter type in isNullPointerValueTemplateArgument!"
, "/build/llvm-toolchain-snapshot-10~svn374877/tools/clang/lib/Sema/SemaTemplate.cpp"
, 5794)
;
5795
5796 if (!S.getLangOpts().CPlusPlus11)
5797 return NPV_NotNullPointer;
5798
5799 // Determine whether we have a constant expression.
5800 ExprResult ArgRV = S.DefaultFunctionArrayConversion(Arg);
5801 if (ArgRV.isInvalid())
5802 return NPV_Error;
5803 Arg = ArgRV.get();
5804
5805 Expr::EvalResult EvalResult;
5806 SmallVector<PartialDiagnosticAt, 8> Notes;
5807 EvalResult.Diag = &Notes;
5808 if (!Arg->EvaluateAsRValue(EvalResult, S.Context) ||
5809 EvalResult.HasSideEffects) {
5810 SourceLocation DiagLoc = Arg->getExprLoc();
5811
5812 // If our only note is the usual "invalid subexpression" note, just point
5813 // the caret at its location rather than producing an essentially
5814 // redundant note.
5815 if (Notes.size() == 1 && Notes[0].second.getDiagID() ==
5816 diag::note_invalid_subexpr_in_const_expr) {
5817 DiagLoc = Notes[0].first;
5818 Notes.clear();
5819 }
5820
5821 S.Diag(DiagLoc, diag::err_template_arg_not_address_constant)
5822 << Arg->getType() << Arg->getSourceRange();
5823 for (unsigned I = 0, N = Notes.size(); I != N; ++I)
5824 S.Diag(Notes[I].first, Notes[I].second);
5825
5826 S.Diag(Param->getLocation(), diag::note_template_param_here);
5827 return NPV_Error;
5828 }
5829
5830 // C++11 [temp.arg.nontype]p1:
5831 // - an address constant expression of type std::nullptr_t
5832 if (Arg->getType()->isNullPtrType())
5833 return NPV_NullPointer;
5834
5835 // - a constant expression that evaluates to a null pointer value (4.10); or
5836 // - a constant expression that evaluates to a null member pointer value
5837 // (4.11); or
5838 if ((EvalResult.Val.isLValue() && !EvalResult.Val.getLValueBase()) ||
5839 (EvalResult.Val.isMemberPointer() &&
5840 !EvalResult.Val.getMemberPointerDecl())) {
5841 // If our expression has an appropriate type, we've succeeded.
5842 bool ObjCLifetimeConversion;
5843 if (S.Context.hasSameUnqualifiedType(Arg->getType(), ParamType) ||
5844 S.IsQualificationConversion(Arg->getType(), ParamType, false,
5845 ObjCLifetimeConversion))
5846 return NPV_NullPointer;
5847
5848 // The types didn't match, but we know we got a null pointer; complain,
5849 // then recover as if the types were correct.
5850 S.Diag(Arg->getExprLoc(), diag::err_template_arg_wrongtype_null_constant)
5851 << Arg->getType() << ParamType << Arg->getSourceRange();
5852 S.Diag(Param->getLocation(), diag::note_template_param_here);
5853 return NPV_NullPointer;
5854 }
5855
5856 // If we don't have a null pointer value, but we do have a NULL pointer
5857 // constant, suggest a cast to the appropriate type.
5858 if (Arg->isNullPointerConstant(S.Context, Expr::NPC_NeverValueDependent)) {
5859 std::string Code = "static_cast<" + ParamType.getAsString() + ">(";
5860 S.Diag(Arg->getExprLoc(), diag::err_template_arg_untyped_null_constant)
5861 << ParamType << FixItHint::CreateInsertion(Arg->getBeginLoc(), Code)
5862 << FixItHint::CreateInsertion(S.getLocForEndOfToken(Arg->getEndLoc()),
5863 ")");
5864 S.Diag(Param->getLocation(), diag::note_template_param_here);
5865 return NPV_NullPointer;
5866 }
5867
5868 // FIXME: If we ever want to support general, address-constant expressions
5869 // as non-type template arguments, we should return the ExprResult here to
5870 // be interpreted by the caller.
5871 return NPV_NotNullPointer;
5872}
5873
5874/// Checks whether the given template argument is compatible with its
5875/// template parameter.
5876static bool CheckTemplateArgumentIsCompatibleWithParameter(
5877 Sema &S, NonTypeTemplateParmDecl *Param, QualType ParamType, Expr *ArgIn,
5878 Expr *Arg, QualType ArgType) {
5879 bool ObjCLifetimeConversion;
5880 if (ParamType->isPointerType() &&
5881 !ParamType->castAs<PointerType>()->getPointeeType()->isFunctionType() &&
5882 S.IsQualificationConversion(ArgType, ParamType, false,
5883 ObjCLifetimeConversion)) {
5884 // For pointer-to-object types, qualification conversions are
5885 // permitted.
5886 } else {
5887 if (const ReferenceType *ParamRef = ParamType->getAs<ReferenceType>()) {
5888 if (!ParamRef->getPointeeType()->isFunctionType()) {
5889 // C++ [temp.arg.nontype]p5b3:
5890 // For a non-type template-parameter of type reference to
5891 // object, no conversions apply. The type referred to by the
5892 // reference may be more cv-qualified than the (otherwise
5893 // identical) type of the template- argument. The
5894 // template-parameter is bound directly to the
5895 // template-argument, which shall be an lvalue.
5896
5897 // FIXME: Other qualifiers?
5898 unsigned ParamQuals = ParamRef->getPointeeType().getCVRQualifiers();
5899 unsigned ArgQuals = ArgType.getCVRQualifiers();
5900
5901 if ((ParamQuals | ArgQuals) != ParamQuals) {
5902 S.Diag(Arg->getBeginLoc(),
5903 diag::err_template_arg_ref_bind_ignores_quals)
5904 << ParamType << Arg->getType() << Arg->getSourceRange();
5905 S.Diag(Param->getLocation(), diag::note_template_param_here);
5906 return true;
5907 }
5908 }
5909 }
5910
5911 // At this point, the template argument refers to an object or
5912 // function with external linkage. We now need to check whether the
5913 // argument and parameter types are compatible.
5914 if (!S.Context.hasSameUnqualifiedType(ArgType,
5915 ParamType.getNonReferenceType())) {
5916 // We can't perform this conversion or binding.
5917 if (ParamType->isReferenceType())
5918 S.Diag(Arg->getBeginLoc(), diag::err_template_arg_no_ref_bind)
5919 << ParamType << ArgIn->getType() << Arg->getSourceRange();
5920 else
5921 S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_convertible)
5922 << ArgIn->getType() << ParamType << Arg->getSourceRange();
5923 S.Diag(Param->getLocation(), diag::note_template_param_here);
5924 return true;
5925 }
5926 }
5927
5928 return false;
5929}
5930
5931/// Checks whether the given template argument is the address
5932/// of an object or function according to C++ [temp.arg.nontype]p1.
5933static bool
5934CheckTemplateArgumentAddressOfObjectOrFunction(Sema &S,
5935 NonTypeTemplateParmDecl *Param,
5936 QualType ParamType,
5937 Expr *ArgIn,
5938 TemplateArgument &Converted) {
5939 bool Invalid = false;
5940 Expr *Arg = ArgIn;
5941 QualType ArgType = Arg->getType();
5942
5943 bool AddressTaken = false;
5944 SourceLocation AddrOpLoc;
5945 if (S.getLangOpts().MicrosoftExt) {
5946 // Microsoft Visual C++ strips all casts, allows an arbitrary number of