Bug Summary

File:clang/lib/Sema/SemaTemplateInstantiate.cpp
Warning:line 2711, column 41
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SemaTemplateInstantiate.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 -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mthread-model posix -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -masm-verbose -mconstructor-aliases -munwind-tables -target-cpu x86-64 -dwarf-column-info -fno-split-dwarf-inlining -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-11/lib/clang/11.0.0 -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-11~++20200309111110+2c36c23f347/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema -I /build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include -I /build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/build-llvm/include -I /build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/llvm/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-11/lib/clang/11.0.0/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-11~++20200309111110+2c36c23f347/build-llvm/tools/clang/lib/Sema -fdebug-prefix-map=/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347=. -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-2020-03-09-184146-41876-1 -x c++ /build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp

/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp

1//===------- SemaTemplateInstantiate.cpp - C++ Template Instantiation ------===/
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 C++ template instantiation.
9//
10//===----------------------------------------------------------------------===/
11
12#include "clang/Sema/SemaInternal.h"
13#include "TreeTransform.h"
14#include "clang/AST/ASTConsumer.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/ASTLambda.h"
17#include "clang/AST/ASTMutationListener.h"
18#include "clang/AST/DeclTemplate.h"
19#include "clang/AST/Expr.h"
20#include "clang/AST/PrettyDeclStackTrace.h"
21#include "clang/AST/TypeVisitor.h"
22#include "clang/Basic/LangOptions.h"
23#include "clang/Basic/Stack.h"
24#include "clang/Sema/DeclSpec.h"
25#include "clang/Sema/Initialization.h"
26#include "clang/Sema/Lookup.h"
27#include "clang/Sema/Template.h"
28#include "clang/Sema/TemplateDeduction.h"
29#include "clang/Sema/TemplateInstCallback.h"
30#include "clang/Sema/SemaConcept.h"
31#include "llvm/Support/TimeProfiler.h"
32
33using namespace clang;
34using namespace sema;
35
36//===----------------------------------------------------------------------===/
37// Template Instantiation Support
38//===----------------------------------------------------------------------===/
39
40/// Retrieve the template argument list(s) that should be used to
41/// instantiate the definition of the given declaration.
42///
43/// \param D the declaration for which we are computing template instantiation
44/// arguments.
45///
46/// \param Innermost if non-NULL, the innermost template argument list.
47///
48/// \param RelativeToPrimary true if we should get the template
49/// arguments relative to the primary template, even when we're
50/// dealing with a specialization. This is only relevant for function
51/// template specializations.
52///
53/// \param Pattern If non-NULL, indicates the pattern from which we will be
54/// instantiating the definition of the given declaration, \p D. This is
55/// used to determine the proper set of template instantiation arguments for
56/// friend function template specializations.
57MultiLevelTemplateArgumentList
58Sema::getTemplateInstantiationArgs(NamedDecl *D,
59 const TemplateArgumentList *Innermost,
60 bool RelativeToPrimary,
61 const FunctionDecl *Pattern) {
62 // Accumulate the set of template argument lists in this structure.
63 MultiLevelTemplateArgumentList Result;
64
65 if (Innermost)
66 Result.addOuterTemplateArguments(Innermost);
67
68 DeclContext *Ctx = dyn_cast<DeclContext>(D);
69 if (!Ctx) {
70 Ctx = D->getDeclContext();
71
72 // Add template arguments from a variable template instantiation. For a
73 // class-scope explicit specialization, there are no template arguments
74 // at this level, but there may be enclosing template arguments.
75 VarTemplateSpecializationDecl *Spec =
76 dyn_cast<VarTemplateSpecializationDecl>(D);
77 if (Spec && !Spec->isClassScopeExplicitSpecialization()) {
78 // We're done when we hit an explicit specialization.
79 if (Spec->getSpecializationKind() == TSK_ExplicitSpecialization &&
80 !isa<VarTemplatePartialSpecializationDecl>(Spec))
81 return Result;
82
83 Result.addOuterTemplateArguments(&Spec->getTemplateInstantiationArgs());
84
85 // If this variable template specialization was instantiated from a
86 // specialized member that is a variable template, we're done.
87 assert(Spec->getSpecializedTemplate() && "No variable template?")((Spec->getSpecializedTemplate() && "No variable template?"
) ? static_cast<void> (0) : __assert_fail ("Spec->getSpecializedTemplate() && \"No variable template?\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 87, __PRETTY_FUNCTION__))
;
88 llvm::PointerUnion<VarTemplateDecl*,
89 VarTemplatePartialSpecializationDecl*> Specialized
90 = Spec->getSpecializedTemplateOrPartial();
91 if (VarTemplatePartialSpecializationDecl *Partial =
92 Specialized.dyn_cast<VarTemplatePartialSpecializationDecl *>()) {
93 if (Partial->isMemberSpecialization())
94 return Result;
95 } else {
96 VarTemplateDecl *Tmpl = Specialized.get<VarTemplateDecl *>();
97 if (Tmpl->isMemberSpecialization())
98 return Result;
99 }
100 }
101
102 // If we have a template template parameter with translation unit context,
103 // then we're performing substitution into a default template argument of
104 // this template template parameter before we've constructed the template
105 // that will own this template template parameter. In this case, we
106 // use empty template parameter lists for all of the outer templates
107 // to avoid performing any substitutions.
108 if (Ctx->isTranslationUnit()) {
109 if (TemplateTemplateParmDecl *TTP
110 = dyn_cast<TemplateTemplateParmDecl>(D)) {
111 for (unsigned I = 0, N = TTP->getDepth() + 1; I != N; ++I)
112 Result.addOuterTemplateArguments(None);
113 return Result;
114 }
115 }
116 }
117
118 while (!Ctx->isFileContext()) {
119 // Add template arguments from a class template instantiation.
120 ClassTemplateSpecializationDecl *Spec
121 = dyn_cast<ClassTemplateSpecializationDecl>(Ctx);
122 if (Spec && !Spec->isClassScopeExplicitSpecialization()) {
123 // We're done when we hit an explicit specialization.
124 if (Spec->getSpecializationKind() == TSK_ExplicitSpecialization &&
125 !isa<ClassTemplatePartialSpecializationDecl>(Spec))
126 break;
127
128 Result.addOuterTemplateArguments(&Spec->getTemplateInstantiationArgs());
129
130 // If this class template specialization was instantiated from a
131 // specialized member that is a class template, we're done.
132 assert(Spec->getSpecializedTemplate() && "No class template?")((Spec->getSpecializedTemplate() && "No class template?"
) ? static_cast<void> (0) : __assert_fail ("Spec->getSpecializedTemplate() && \"No class template?\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 132, __PRETTY_FUNCTION__))
;
133 if (Spec->getSpecializedTemplate()->isMemberSpecialization())
134 break;
135 }
136 // Add template arguments from a function template specialization.
137 else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Ctx)) {
138 if (!RelativeToPrimary &&
139 Function->getTemplateSpecializationKindForInstantiation() ==
140 TSK_ExplicitSpecialization)
141 break;
142
143 if (const TemplateArgumentList *TemplateArgs
144 = Function->getTemplateSpecializationArgs()) {
145 // Add the template arguments for this specialization.
146 Result.addOuterTemplateArguments(TemplateArgs);
147
148 // If this function was instantiated from a specialized member that is
149 // a function template, we're done.
150 assert(Function->getPrimaryTemplate() && "No function template?")((Function->getPrimaryTemplate() && "No function template?"
) ? static_cast<void> (0) : __assert_fail ("Function->getPrimaryTemplate() && \"No function template?\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 150, __PRETTY_FUNCTION__))
;
151 if (Function->getPrimaryTemplate()->isMemberSpecialization())
152 break;
153
154 // If this function is a generic lambda specialization, we are done.
155 if (isGenericLambdaCallOperatorOrStaticInvokerSpecialization(Function))
156 break;
157
158 } else if (FunctionTemplateDecl *FunTmpl
159 = Function->getDescribedFunctionTemplate()) {
160 // Add the "injected" template arguments.
161 Result.addOuterTemplateArguments(FunTmpl->getInjectedTemplateArgs());
162 }
163
164 // If this is a friend declaration and it declares an entity at
165 // namespace scope, take arguments from its lexical parent
166 // instead of its semantic parent, unless of course the pattern we're
167 // instantiating actually comes from the file's context!
168 if (Function->getFriendObjectKind() &&
169 Function->getDeclContext()->isFileContext() &&
170 (!Pattern || !Pattern->getLexicalDeclContext()->isFileContext())) {
171 Ctx = Function->getLexicalDeclContext();
172 RelativeToPrimary = false;
173 continue;
174 }
175 } else if (CXXRecordDecl *Rec = dyn_cast<CXXRecordDecl>(Ctx)) {
176 if (ClassTemplateDecl *ClassTemplate = Rec->getDescribedClassTemplate()) {
177 QualType T = ClassTemplate->getInjectedClassNameSpecialization();
178 const TemplateSpecializationType *TST =
179 cast<TemplateSpecializationType>(Context.getCanonicalType(T));
180 Result.addOuterTemplateArguments(
181 llvm::makeArrayRef(TST->getArgs(), TST->getNumArgs()));
182 if (ClassTemplate->isMemberSpecialization())
183 break;
184 }
185 }
186
187 Ctx = Ctx->getParent();
188 RelativeToPrimary = false;
189 }
190
191 return Result;
192}
193
194bool Sema::CodeSynthesisContext::isInstantiationRecord() const {
195 switch (Kind) {
196 case TemplateInstantiation:
197 case ExceptionSpecInstantiation:
198 case DefaultTemplateArgumentInstantiation:
199 case DefaultFunctionArgumentInstantiation:
200 case ExplicitTemplateArgumentSubstitution:
201 case DeducedTemplateArgumentSubstitution:
202 case PriorTemplateArgumentSubstitution:
203 case ConstraintsCheck:
204 case NestedRequirementConstraintsCheck:
205 return true;
206
207 case RequirementInstantiation:
208 case DefaultTemplateArgumentChecking:
209 case DeclaringSpecialMember:
210 case DeclaringImplicitEqualityComparison:
211 case DefiningSynthesizedFunction:
212 case ExceptionSpecEvaluation:
213 case ConstraintSubstitution:
214 case ParameterMappingSubstitution:
215 case ConstraintNormalization:
216 case RewritingOperatorAsSpaceship:
217 return false;
218
219 // This function should never be called when Kind's value is Memoization.
220 case Memoization:
221 break;
222 }
223
224 llvm_unreachable("Invalid SynthesisKind!")::llvm::llvm_unreachable_internal("Invalid SynthesisKind!", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 224)
;
225}
226
227Sema::InstantiatingTemplate::InstantiatingTemplate(
228 Sema &SemaRef, CodeSynthesisContext::SynthesisKind Kind,
229 SourceLocation PointOfInstantiation, SourceRange InstantiationRange,
230 Decl *Entity, NamedDecl *Template, ArrayRef<TemplateArgument> TemplateArgs,
231 sema::TemplateDeductionInfo *DeductionInfo)
232 : SemaRef(SemaRef) {
233 // Don't allow further instantiation if a fatal error and an uncompilable
234 // error have occurred. Any diagnostics we might have raised will not be
235 // visible, and we do not need to construct a correct AST.
236 if (SemaRef.Diags.hasFatalErrorOccurred() &&
36
Assuming the condition is false
237 SemaRef.Diags.hasUncompilableErrorOccurred()) {
238 Invalid = true;
239 return;
240 }
241 Invalid = CheckInstantiationDepth(PointOfInstantiation, InstantiationRange);
37
Calling 'InstantiatingTemplate::CheckInstantiationDepth'
43
Returning from 'InstantiatingTemplate::CheckInstantiationDepth'
242 if (!Invalid
43.1
Field 'Invalid' is false
43.1
Field 'Invalid' is false
) {
44
Taking true branch
243 CodeSynthesisContext Inst;
244 Inst.Kind = Kind;
245 Inst.PointOfInstantiation = PointOfInstantiation;
246 Inst.Entity = Entity;
247 Inst.Template = Template;
248 Inst.TemplateArgs = TemplateArgs.data();
249 Inst.NumTemplateArgs = TemplateArgs.size();
250 Inst.DeductionInfo = DeductionInfo;
251 Inst.InstantiationRange = InstantiationRange;
252 SemaRef.pushCodeSynthesisContext(Inst);
253
254 AlreadyInstantiating = !Inst.Entity
44.1
Field 'Entity' is non-null
44.1
Field 'Entity' is non-null
? false :
45
'?' condition is false
255 !SemaRef.InstantiatingSpecializations
46
Assuming field 'second' is true
256 .insert(std::make_pair(Inst.Entity->getCanonicalDecl(), Inst.Kind))
257 .second;
258 atTemplateBegin(SemaRef.TemplateInstCallbacks, SemaRef, Inst);
259 }
260}
261
262Sema::InstantiatingTemplate::InstantiatingTemplate(
263 Sema &SemaRef, SourceLocation PointOfInstantiation, Decl *Entity,
264 SourceRange InstantiationRange)
265 : InstantiatingTemplate(SemaRef,
35
Calling constructor for 'InstantiatingTemplate'
47
Returning from constructor for 'InstantiatingTemplate'
266 CodeSynthesisContext::TemplateInstantiation,
267 PointOfInstantiation, InstantiationRange, Entity) {}
268
269Sema::InstantiatingTemplate::InstantiatingTemplate(
270 Sema &SemaRef, SourceLocation PointOfInstantiation, FunctionDecl *Entity,
271 ExceptionSpecification, SourceRange InstantiationRange)
272 : InstantiatingTemplate(
273 SemaRef, CodeSynthesisContext::ExceptionSpecInstantiation,
274 PointOfInstantiation, InstantiationRange, Entity) {}
275
276Sema::InstantiatingTemplate::InstantiatingTemplate(
277 Sema &SemaRef, SourceLocation PointOfInstantiation, TemplateParameter Param,
278 TemplateDecl *Template, ArrayRef<TemplateArgument> TemplateArgs,
279 SourceRange InstantiationRange)
280 : InstantiatingTemplate(
281 SemaRef,
282 CodeSynthesisContext::DefaultTemplateArgumentInstantiation,
283 PointOfInstantiation, InstantiationRange, getAsNamedDecl(Param),
284 Template, TemplateArgs) {}
285
286Sema::InstantiatingTemplate::InstantiatingTemplate(
287 Sema &SemaRef, SourceLocation PointOfInstantiation,
288 FunctionTemplateDecl *FunctionTemplate,
289 ArrayRef<TemplateArgument> TemplateArgs,
290 CodeSynthesisContext::SynthesisKind Kind,
291 sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
292 : InstantiatingTemplate(SemaRef, Kind, PointOfInstantiation,
293 InstantiationRange, FunctionTemplate, nullptr,
294 TemplateArgs, &DeductionInfo) {
295 assert(((Kind == CodeSynthesisContext::ExplicitTemplateArgumentSubstitution
|| Kind == CodeSynthesisContext::DeducedTemplateArgumentSubstitution
) ? static_cast<void> (0) : __assert_fail ("Kind == CodeSynthesisContext::ExplicitTemplateArgumentSubstitution || Kind == CodeSynthesisContext::DeducedTemplateArgumentSubstitution"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 297, __PRETTY_FUNCTION__))
296 Kind == CodeSynthesisContext::ExplicitTemplateArgumentSubstitution ||((Kind == CodeSynthesisContext::ExplicitTemplateArgumentSubstitution
|| Kind == CodeSynthesisContext::DeducedTemplateArgumentSubstitution
) ? static_cast<void> (0) : __assert_fail ("Kind == CodeSynthesisContext::ExplicitTemplateArgumentSubstitution || Kind == CodeSynthesisContext::DeducedTemplateArgumentSubstitution"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 297, __PRETTY_FUNCTION__))
297 Kind == CodeSynthesisContext::DeducedTemplateArgumentSubstitution)((Kind == CodeSynthesisContext::ExplicitTemplateArgumentSubstitution
|| Kind == CodeSynthesisContext::DeducedTemplateArgumentSubstitution
) ? static_cast<void> (0) : __assert_fail ("Kind == CodeSynthesisContext::ExplicitTemplateArgumentSubstitution || Kind == CodeSynthesisContext::DeducedTemplateArgumentSubstitution"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 297, __PRETTY_FUNCTION__))
;
298}
299
300Sema::InstantiatingTemplate::InstantiatingTemplate(
301 Sema &SemaRef, SourceLocation PointOfInstantiation,
302 TemplateDecl *Template,
303 ArrayRef<TemplateArgument> TemplateArgs,
304 sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
305 : InstantiatingTemplate(
306 SemaRef,
307 CodeSynthesisContext::DeducedTemplateArgumentSubstitution,
308 PointOfInstantiation, InstantiationRange, Template, nullptr,
309 TemplateArgs, &DeductionInfo) {}
310
311Sema::InstantiatingTemplate::InstantiatingTemplate(
312 Sema &SemaRef, SourceLocation PointOfInstantiation,
313 ClassTemplatePartialSpecializationDecl *PartialSpec,
314 ArrayRef<TemplateArgument> TemplateArgs,
315 sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
316 : InstantiatingTemplate(
317 SemaRef,
318 CodeSynthesisContext::DeducedTemplateArgumentSubstitution,
319 PointOfInstantiation, InstantiationRange, PartialSpec, nullptr,
320 TemplateArgs, &DeductionInfo) {}
321
322Sema::InstantiatingTemplate::InstantiatingTemplate(
323 Sema &SemaRef, SourceLocation PointOfInstantiation,
324 VarTemplatePartialSpecializationDecl *PartialSpec,
325 ArrayRef<TemplateArgument> TemplateArgs,
326 sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
327 : InstantiatingTemplate(
328 SemaRef,
329 CodeSynthesisContext::DeducedTemplateArgumentSubstitution,
330 PointOfInstantiation, InstantiationRange, PartialSpec, nullptr,
331 TemplateArgs, &DeductionInfo) {}
332
333Sema::InstantiatingTemplate::InstantiatingTemplate(
334 Sema &SemaRef, SourceLocation PointOfInstantiation, ParmVarDecl *Param,
335 ArrayRef<TemplateArgument> TemplateArgs, SourceRange InstantiationRange)
336 : InstantiatingTemplate(
337 SemaRef,
338 CodeSynthesisContext::DefaultFunctionArgumentInstantiation,
339 PointOfInstantiation, InstantiationRange, Param, nullptr,
340 TemplateArgs) {}
341
342Sema::InstantiatingTemplate::InstantiatingTemplate(
343 Sema &SemaRef, SourceLocation PointOfInstantiation, NamedDecl *Template,
344 NonTypeTemplateParmDecl *Param, ArrayRef<TemplateArgument> TemplateArgs,
345 SourceRange InstantiationRange)
346 : InstantiatingTemplate(
347 SemaRef,
348 CodeSynthesisContext::PriorTemplateArgumentSubstitution,
349 PointOfInstantiation, InstantiationRange, Param, Template,
350 TemplateArgs) {}
351
352Sema::InstantiatingTemplate::InstantiatingTemplate(
353 Sema &SemaRef, SourceLocation PointOfInstantiation, NamedDecl *Template,
354 TemplateTemplateParmDecl *Param, ArrayRef<TemplateArgument> TemplateArgs,
355 SourceRange InstantiationRange)
356 : InstantiatingTemplate(
357 SemaRef,
358 CodeSynthesisContext::PriorTemplateArgumentSubstitution,
359 PointOfInstantiation, InstantiationRange, Param, Template,
360 TemplateArgs) {}
361
362Sema::InstantiatingTemplate::InstantiatingTemplate(
363 Sema &SemaRef, SourceLocation PointOfInstantiation, TemplateDecl *Template,
364 NamedDecl *Param, ArrayRef<TemplateArgument> TemplateArgs,
365 SourceRange InstantiationRange)
366 : InstantiatingTemplate(
367 SemaRef, CodeSynthesisContext::DefaultTemplateArgumentChecking,
368 PointOfInstantiation, InstantiationRange, Param, Template,
369 TemplateArgs) {}
370
371Sema::InstantiatingTemplate::InstantiatingTemplate(
372 Sema &SemaRef, SourceLocation PointOfInstantiation,
373 concepts::Requirement *Req, sema::TemplateDeductionInfo &DeductionInfo,
374 SourceRange InstantiationRange)
375 : InstantiatingTemplate(
376 SemaRef, CodeSynthesisContext::RequirementInstantiation,
377 PointOfInstantiation, InstantiationRange, /*Entity=*/nullptr,
378 /*Template=*/nullptr, /*TemplateArgs=*/None, &DeductionInfo) {}
379
380
381Sema::InstantiatingTemplate::InstantiatingTemplate(
382 Sema &SemaRef, SourceLocation PointOfInstantiation,
383 concepts::NestedRequirement *Req, ConstraintsCheck,
384 SourceRange InstantiationRange)
385 : InstantiatingTemplate(
386 SemaRef, CodeSynthesisContext::NestedRequirementConstraintsCheck,
387 PointOfInstantiation, InstantiationRange, /*Entity=*/nullptr,
388 /*Template=*/nullptr, /*TemplateArgs=*/None) {}
389
390
391Sema::InstantiatingTemplate::InstantiatingTemplate(
392 Sema &SemaRef, SourceLocation PointOfInstantiation,
393 ConstraintsCheck, NamedDecl *Template,
394 ArrayRef<TemplateArgument> TemplateArgs, SourceRange InstantiationRange)
395 : InstantiatingTemplate(
396 SemaRef, CodeSynthesisContext::ConstraintsCheck,
397 PointOfInstantiation, InstantiationRange, Template, nullptr,
398 TemplateArgs) {}
399
400Sema::InstantiatingTemplate::InstantiatingTemplate(
401 Sema &SemaRef, SourceLocation PointOfInstantiation,
402 ConstraintSubstitution, NamedDecl *Template,
403 sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
404 : InstantiatingTemplate(
405 SemaRef, CodeSynthesisContext::ConstraintSubstitution,
406 PointOfInstantiation, InstantiationRange, Template, nullptr,
407 {}, &DeductionInfo) {}
408
409Sema::InstantiatingTemplate::InstantiatingTemplate(
410 Sema &SemaRef, SourceLocation PointOfInstantiation,
411 ConstraintNormalization, NamedDecl *Template,
412 SourceRange InstantiationRange)
413 : InstantiatingTemplate(
414 SemaRef, CodeSynthesisContext::ConstraintNormalization,
415 PointOfInstantiation, InstantiationRange, Template) {}
416
417Sema::InstantiatingTemplate::InstantiatingTemplate(
418 Sema &SemaRef, SourceLocation PointOfInstantiation,
419 ParameterMappingSubstitution, NamedDecl *Template,
420 SourceRange InstantiationRange)
421 : InstantiatingTemplate(
422 SemaRef, CodeSynthesisContext::ParameterMappingSubstitution,
423 PointOfInstantiation, InstantiationRange, Template) {}
424
425void Sema::pushCodeSynthesisContext(CodeSynthesisContext Ctx) {
426 Ctx.SavedInNonInstantiationSFINAEContext = InNonInstantiationSFINAEContext;
427 InNonInstantiationSFINAEContext = false;
428
429 CodeSynthesisContexts.push_back(Ctx);
430
431 if (!Ctx.isInstantiationRecord())
432 ++NonInstantiationEntries;
433
434 // Check to see if we're low on stack space. We can't do anything about this
435 // from here, but we can at least warn the user.
436 if (isStackNearlyExhausted())
437 warnStackExhausted(Ctx.PointOfInstantiation);
438}
439
440void Sema::popCodeSynthesisContext() {
441 auto &Active = CodeSynthesisContexts.back();
442 if (!Active.isInstantiationRecord()) {
443 assert(NonInstantiationEntries > 0)((NonInstantiationEntries > 0) ? static_cast<void> (
0) : __assert_fail ("NonInstantiationEntries > 0", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 443, __PRETTY_FUNCTION__))
;
444 --NonInstantiationEntries;
445 }
446
447 InNonInstantiationSFINAEContext = Active.SavedInNonInstantiationSFINAEContext;
448
449 // Name lookup no longer looks in this template's defining module.
450 assert(CodeSynthesisContexts.size() >=((CodeSynthesisContexts.size() >= CodeSynthesisContextLookupModules
.size() && "forgot to remove a lookup module for a template instantiation"
) ? static_cast<void> (0) : __assert_fail ("CodeSynthesisContexts.size() >= CodeSynthesisContextLookupModules.size() && \"forgot to remove a lookup module for a template instantiation\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 452, __PRETTY_FUNCTION__))
451 CodeSynthesisContextLookupModules.size() &&((CodeSynthesisContexts.size() >= CodeSynthesisContextLookupModules
.size() && "forgot to remove a lookup module for a template instantiation"
) ? static_cast<void> (0) : __assert_fail ("CodeSynthesisContexts.size() >= CodeSynthesisContextLookupModules.size() && \"forgot to remove a lookup module for a template instantiation\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 452, __PRETTY_FUNCTION__))
452 "forgot to remove a lookup module for a template instantiation")((CodeSynthesisContexts.size() >= CodeSynthesisContextLookupModules
.size() && "forgot to remove a lookup module for a template instantiation"
) ? static_cast<void> (0) : __assert_fail ("CodeSynthesisContexts.size() >= CodeSynthesisContextLookupModules.size() && \"forgot to remove a lookup module for a template instantiation\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 452, __PRETTY_FUNCTION__))
;
453 if (CodeSynthesisContexts.size() ==
454 CodeSynthesisContextLookupModules.size()) {
455 if (Module *M = CodeSynthesisContextLookupModules.back())
456 LookupModulesCache.erase(M);
457 CodeSynthesisContextLookupModules.pop_back();
458 }
459
460 // If we've left the code synthesis context for the current context stack,
461 // stop remembering that we've emitted that stack.
462 if (CodeSynthesisContexts.size() ==
463 LastEmittedCodeSynthesisContextDepth)
464 LastEmittedCodeSynthesisContextDepth = 0;
465
466 CodeSynthesisContexts.pop_back();
467}
468
469void Sema::InstantiatingTemplate::Clear() {
470 if (!Invalid) {
471 if (!AlreadyInstantiating) {
472 auto &Active = SemaRef.CodeSynthesisContexts.back();
473 if (Active.Entity)
474 SemaRef.InstantiatingSpecializations.erase(
475 std::make_pair(Active.Entity, Active.Kind));
476 }
477
478 atTemplateEnd(SemaRef.TemplateInstCallbacks, SemaRef,
479 SemaRef.CodeSynthesisContexts.back());
480
481 SemaRef.popCodeSynthesisContext();
482 Invalid = true;
483 }
484}
485
486bool Sema::InstantiatingTemplate::CheckInstantiationDepth(
487 SourceLocation PointOfInstantiation,
488 SourceRange InstantiationRange) {
489 assert(SemaRef.NonInstantiationEntries <=((SemaRef.NonInstantiationEntries <= SemaRef.CodeSynthesisContexts
.size()) ? static_cast<void> (0) : __assert_fail ("SemaRef.NonInstantiationEntries <= SemaRef.CodeSynthesisContexts.size()"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 490, __PRETTY_FUNCTION__))
38
Assuming the condition is true
39
'?' condition is true
490 SemaRef.CodeSynthesisContexts.size())((SemaRef.NonInstantiationEntries <= SemaRef.CodeSynthesisContexts
.size()) ? static_cast<void> (0) : __assert_fail ("SemaRef.NonInstantiationEntries <= SemaRef.CodeSynthesisContexts.size()"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 490, __PRETTY_FUNCTION__))
;
491 if ((SemaRef.CodeSynthesisContexts.size() -
40
Assuming the condition is true
41
Taking true branch
492 SemaRef.NonInstantiationEntries)
493 <= SemaRef.getLangOpts().InstantiationDepth)
494 return false;
42
Returning zero, which participates in a condition later
495
496 SemaRef.Diag(PointOfInstantiation,
497 diag::err_template_recursion_depth_exceeded)
498 << SemaRef.getLangOpts().InstantiationDepth
499 << InstantiationRange;
500 SemaRef.Diag(PointOfInstantiation, diag::note_template_recursion_depth)
501 << SemaRef.getLangOpts().InstantiationDepth;
502 return true;
503}
504
505/// Prints the current instantiation stack through a series of
506/// notes.
507void Sema::PrintInstantiationStack() {
508 // Determine which template instantiations to skip, if any.
509 unsigned SkipStart = CodeSynthesisContexts.size(), SkipEnd = SkipStart;
510 unsigned Limit = Diags.getTemplateBacktraceLimit();
511 if (Limit && Limit < CodeSynthesisContexts.size()) {
512 SkipStart = Limit / 2 + Limit % 2;
513 SkipEnd = CodeSynthesisContexts.size() - Limit / 2;
514 }
515
516 // FIXME: In all of these cases, we need to show the template arguments
517 unsigned InstantiationIdx = 0;
518 for (SmallVectorImpl<CodeSynthesisContext>::reverse_iterator
519 Active = CodeSynthesisContexts.rbegin(),
520 ActiveEnd = CodeSynthesisContexts.rend();
521 Active != ActiveEnd;
522 ++Active, ++InstantiationIdx) {
523 // Skip this instantiation?
524 if (InstantiationIdx >= SkipStart && InstantiationIdx < SkipEnd) {
525 if (InstantiationIdx == SkipStart) {
526 // Note that we're skipping instantiations.
527 Diags.Report(Active->PointOfInstantiation,
528 diag::note_instantiation_contexts_suppressed)
529 << unsigned(CodeSynthesisContexts.size() - Limit);
530 }
531 continue;
532 }
533
534 switch (Active->Kind) {
535 case CodeSynthesisContext::TemplateInstantiation: {
536 Decl *D = Active->Entity;
537 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) {
538 unsigned DiagID = diag::note_template_member_class_here;
539 if (isa<ClassTemplateSpecializationDecl>(Record))
540 DiagID = diag::note_template_class_instantiation_here;
541 Diags.Report(Active->PointOfInstantiation, DiagID)
542 << Record << Active->InstantiationRange;
543 } else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) {
544 unsigned DiagID;
545 if (Function->getPrimaryTemplate())
546 DiagID = diag::note_function_template_spec_here;
547 else
548 DiagID = diag::note_template_member_function_here;
549 Diags.Report(Active->PointOfInstantiation, DiagID)
550 << Function
551 << Active->InstantiationRange;
552 } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
553 Diags.Report(Active->PointOfInstantiation,
554 VD->isStaticDataMember()?
555 diag::note_template_static_data_member_def_here
556 : diag::note_template_variable_def_here)
557 << VD
558 << Active->InstantiationRange;
559 } else if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) {
560 Diags.Report(Active->PointOfInstantiation,
561 diag::note_template_enum_def_here)
562 << ED
563 << Active->InstantiationRange;
564 } else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
565 Diags.Report(Active->PointOfInstantiation,
566 diag::note_template_nsdmi_here)
567 << FD << Active->InstantiationRange;
568 } else {
569 Diags.Report(Active->PointOfInstantiation,
570 diag::note_template_type_alias_instantiation_here)
571 << cast<TypeAliasTemplateDecl>(D)
572 << Active->InstantiationRange;
573 }
574 break;
575 }
576
577 case CodeSynthesisContext::DefaultTemplateArgumentInstantiation: {
578 TemplateDecl *Template = cast<TemplateDecl>(Active->Template);
579 SmallVector<char, 128> TemplateArgsStr;
580 llvm::raw_svector_ostream OS(TemplateArgsStr);
581 Template->printName(OS);
582 printTemplateArgumentList(OS, Active->template_arguments(),
583 getPrintingPolicy());
584 Diags.Report(Active->PointOfInstantiation,
585 diag::note_default_arg_instantiation_here)
586 << OS.str()
587 << Active->InstantiationRange;
588 break;
589 }
590
591 case CodeSynthesisContext::ExplicitTemplateArgumentSubstitution: {
592 FunctionTemplateDecl *FnTmpl = cast<FunctionTemplateDecl>(Active->Entity);
593 Diags.Report(Active->PointOfInstantiation,
594 diag::note_explicit_template_arg_substitution_here)
595 << FnTmpl
596 << getTemplateArgumentBindingsText(FnTmpl->getTemplateParameters(),
597 Active->TemplateArgs,
598 Active->NumTemplateArgs)
599 << Active->InstantiationRange;
600 break;
601 }
602
603 case CodeSynthesisContext::DeducedTemplateArgumentSubstitution: {
604 if (FunctionTemplateDecl *FnTmpl =
605 dyn_cast<FunctionTemplateDecl>(Active->Entity)) {
606 Diags.Report(Active->PointOfInstantiation,
607 diag::note_function_template_deduction_instantiation_here)
608 << FnTmpl
609 << getTemplateArgumentBindingsText(FnTmpl->getTemplateParameters(),
610 Active->TemplateArgs,
611 Active->NumTemplateArgs)
612 << Active->InstantiationRange;
613 } else {
614 bool IsVar = isa<VarTemplateDecl>(Active->Entity) ||
615 isa<VarTemplateSpecializationDecl>(Active->Entity);
616 bool IsTemplate = false;
617 TemplateParameterList *Params;
618 if (auto *D = dyn_cast<TemplateDecl>(Active->Entity)) {
619 IsTemplate = true;
620 Params = D->getTemplateParameters();
621 } else if (auto *D = dyn_cast<ClassTemplatePartialSpecializationDecl>(
622 Active->Entity)) {
623 Params = D->getTemplateParameters();
624 } else if (auto *D = dyn_cast<VarTemplatePartialSpecializationDecl>(
625 Active->Entity)) {
626 Params = D->getTemplateParameters();
627 } else {
628 llvm_unreachable("unexpected template kind")::llvm::llvm_unreachable_internal("unexpected template kind",
"/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 628)
;
629 }
630
631 Diags.Report(Active->PointOfInstantiation,
632 diag::note_deduced_template_arg_substitution_here)
633 << IsVar << IsTemplate << cast<NamedDecl>(Active->Entity)
634 << getTemplateArgumentBindingsText(Params, Active->TemplateArgs,
635 Active->NumTemplateArgs)
636 << Active->InstantiationRange;
637 }
638 break;
639 }
640
641 case CodeSynthesisContext::DefaultFunctionArgumentInstantiation: {
642 ParmVarDecl *Param = cast<ParmVarDecl>(Active->Entity);
643 FunctionDecl *FD = cast<FunctionDecl>(Param->getDeclContext());
644
645 SmallVector<char, 128> TemplateArgsStr;
646 llvm::raw_svector_ostream OS(TemplateArgsStr);
647 FD->printName(OS);
648 printTemplateArgumentList(OS, Active->template_arguments(),
649 getPrintingPolicy());
650 Diags.Report(Active->PointOfInstantiation,
651 diag::note_default_function_arg_instantiation_here)
652 << OS.str()
653 << Active->InstantiationRange;
654 break;
655 }
656
657 case CodeSynthesisContext::PriorTemplateArgumentSubstitution: {
658 NamedDecl *Parm = cast<NamedDecl>(Active->Entity);
659 std::string Name;
660 if (!Parm->getName().empty())
661 Name = std::string(" '") + Parm->getName().str() + "'";
662
663 TemplateParameterList *TemplateParams = nullptr;
664 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(Active->Template))
665 TemplateParams = Template->getTemplateParameters();
666 else
667 TemplateParams =
668 cast<ClassTemplatePartialSpecializationDecl>(Active->Template)
669 ->getTemplateParameters();
670 Diags.Report(Active->PointOfInstantiation,
671 diag::note_prior_template_arg_substitution)
672 << isa<TemplateTemplateParmDecl>(Parm)
673 << Name
674 << getTemplateArgumentBindingsText(TemplateParams,
675 Active->TemplateArgs,
676 Active->NumTemplateArgs)
677 << Active->InstantiationRange;
678 break;
679 }
680
681 case CodeSynthesisContext::DefaultTemplateArgumentChecking: {
682 TemplateParameterList *TemplateParams = nullptr;
683 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(Active->Template))
684 TemplateParams = Template->getTemplateParameters();
685 else
686 TemplateParams =
687 cast<ClassTemplatePartialSpecializationDecl>(Active->Template)
688 ->getTemplateParameters();
689
690 Diags.Report(Active->PointOfInstantiation,
691 diag::note_template_default_arg_checking)
692 << getTemplateArgumentBindingsText(TemplateParams,
693 Active->TemplateArgs,
694 Active->NumTemplateArgs)
695 << Active->InstantiationRange;
696 break;
697 }
698
699 case CodeSynthesisContext::ExceptionSpecEvaluation:
700 Diags.Report(Active->PointOfInstantiation,
701 diag::note_evaluating_exception_spec_here)
702 << cast<FunctionDecl>(Active->Entity);
703 break;
704
705 case CodeSynthesisContext::ExceptionSpecInstantiation:
706 Diags.Report(Active->PointOfInstantiation,
707 diag::note_template_exception_spec_instantiation_here)
708 << cast<FunctionDecl>(Active->Entity)
709 << Active->InstantiationRange;
710 break;
711
712 case CodeSynthesisContext::RequirementInstantiation:
713 Diags.Report(Active->PointOfInstantiation,
714 diag::note_template_requirement_instantiation_here)
715 << Active->InstantiationRange;
716 break;
717
718 case CodeSynthesisContext::NestedRequirementConstraintsCheck:
719 Diags.Report(Active->PointOfInstantiation,
720 diag::note_nested_requirement_here)
721 << Active->InstantiationRange;
722 break;
723
724 case CodeSynthesisContext::DeclaringSpecialMember:
725 Diags.Report(Active->PointOfInstantiation,
726 diag::note_in_declaration_of_implicit_special_member)
727 << cast<CXXRecordDecl>(Active->Entity) << Active->SpecialMember;
728 break;
729
730 case CodeSynthesisContext::DeclaringImplicitEqualityComparison:
731 Diags.Report(Active->Entity->getLocation(),
732 diag::note_in_declaration_of_implicit_equality_comparison);
733 break;
734
735 case CodeSynthesisContext::DefiningSynthesizedFunction: {
736 // FIXME: For synthesized functions that are not defaulted,
737 // produce a note.
738 auto *FD = dyn_cast<FunctionDecl>(Active->Entity);
739 DefaultedFunctionKind DFK =
740 FD ? getDefaultedFunctionKind(FD) : DefaultedFunctionKind();
741 if (DFK.isSpecialMember()) {
742 auto *MD = cast<CXXMethodDecl>(FD);
743 Diags.Report(Active->PointOfInstantiation,
744 diag::note_member_synthesized_at)
745 << MD->isExplicitlyDefaulted() << DFK.asSpecialMember()
746 << Context.getTagDeclType(MD->getParent());
747 } else if (DFK.isComparison()) {
748 Diags.Report(Active->PointOfInstantiation,
749 diag::note_comparison_synthesized_at)
750 << (int)DFK.asComparison()
751 << Context.getTagDeclType(
752 cast<CXXRecordDecl>(FD->getLexicalDeclContext()));
753 }
754 break;
755 }
756
757 case CodeSynthesisContext::RewritingOperatorAsSpaceship:
758 Diags.Report(Active->Entity->getLocation(),
759 diag::note_rewriting_operator_as_spaceship);
760 break;
761
762 case CodeSynthesisContext::Memoization:
763 break;
764
765 case CodeSynthesisContext::ConstraintsCheck: {
766 unsigned DiagID = 0;
767 if (!Active->Entity) {
768 Diags.Report(Active->PointOfInstantiation,
769 diag::note_nested_requirement_here)
770 << Active->InstantiationRange;
771 break;
772 }
773 if (isa<ConceptDecl>(Active->Entity))
774 DiagID = diag::note_concept_specialization_here;
775 else if (isa<TemplateDecl>(Active->Entity))
776 DiagID = diag::note_checking_constraints_for_template_id_here;
777 else if (isa<VarTemplatePartialSpecializationDecl>(Active->Entity))
778 DiagID = diag::note_checking_constraints_for_var_spec_id_here;
779 else if (isa<ClassTemplatePartialSpecializationDecl>(Active->Entity))
780 DiagID = diag::note_checking_constraints_for_class_spec_id_here;
781 else {
782 assert(isa<FunctionDecl>(Active->Entity))((isa<FunctionDecl>(Active->Entity)) ? static_cast<
void> (0) : __assert_fail ("isa<FunctionDecl>(Active->Entity)"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 782, __PRETTY_FUNCTION__))
;
783 DiagID = diag::note_checking_constraints_for_function_here;
784 }
785 SmallVector<char, 128> TemplateArgsStr;
786 llvm::raw_svector_ostream OS(TemplateArgsStr);
787 cast<NamedDecl>(Active->Entity)->printName(OS);
788 if (!isa<FunctionDecl>(Active->Entity))
789 printTemplateArgumentList(OS, Active->template_arguments(),
790 getPrintingPolicy());
791 Diags.Report(Active->PointOfInstantiation, DiagID) << OS.str()
792 << Active->InstantiationRange;
793 break;
794 }
795 case CodeSynthesisContext::ConstraintSubstitution:
796 Diags.Report(Active->PointOfInstantiation,
797 diag::note_constraint_substitution_here)
798 << Active->InstantiationRange;
799 break;
800 case CodeSynthesisContext::ConstraintNormalization:
801 Diags.Report(Active->PointOfInstantiation,
802 diag::note_constraint_normalization_here)
803 << cast<NamedDecl>(Active->Entity)->getName()
804 << Active->InstantiationRange;
805 break;
806 case CodeSynthesisContext::ParameterMappingSubstitution:
807 Diags.Report(Active->PointOfInstantiation,
808 diag::note_parameter_mapping_substitution_here)
809 << Active->InstantiationRange;
810 break;
811 }
812 }
813}
814
815Optional<TemplateDeductionInfo *> Sema::isSFINAEContext() const {
816 if (InNonInstantiationSFINAEContext)
817 return Optional<TemplateDeductionInfo *>(nullptr);
818
819 for (SmallVectorImpl<CodeSynthesisContext>::const_reverse_iterator
820 Active = CodeSynthesisContexts.rbegin(),
821 ActiveEnd = CodeSynthesisContexts.rend();
822 Active != ActiveEnd;
823 ++Active)
824 {
825 switch (Active->Kind) {
826 case CodeSynthesisContext::TemplateInstantiation:
827 // An instantiation of an alias template may or may not be a SFINAE
828 // context, depending on what else is on the stack.
829 if (isa<TypeAliasTemplateDecl>(Active->Entity))
830 break;
831 LLVM_FALLTHROUGH[[gnu::fallthrough]];
832 case CodeSynthesisContext::DefaultFunctionArgumentInstantiation:
833 case CodeSynthesisContext::ExceptionSpecInstantiation:
834 case CodeSynthesisContext::ConstraintsCheck:
835 case CodeSynthesisContext::ParameterMappingSubstitution:
836 case CodeSynthesisContext::ConstraintNormalization:
837 case CodeSynthesisContext::NestedRequirementConstraintsCheck:
838 // This is a template instantiation, so there is no SFINAE.
839 return None;
840
841 case CodeSynthesisContext::DefaultTemplateArgumentInstantiation:
842 case CodeSynthesisContext::PriorTemplateArgumentSubstitution:
843 case CodeSynthesisContext::DefaultTemplateArgumentChecking:
844 // A default template argument instantiation and substitution into
845 // template parameters with arguments for prior parameters may or may
846 // not be a SFINAE context; look further up the stack.
847 break;
848
849 case CodeSynthesisContext::ExplicitTemplateArgumentSubstitution:
850 case CodeSynthesisContext::DeducedTemplateArgumentSubstitution:
851 case CodeSynthesisContext::ConstraintSubstitution:
852 case CodeSynthesisContext::RequirementInstantiation:
853 // We're either substituting explicitly-specified template arguments,
854 // deduced template arguments, a constraint expression or a requirement
855 // in a requires expression, so SFINAE applies.
856 assert(Active->DeductionInfo && "Missing deduction info pointer")((Active->DeductionInfo && "Missing deduction info pointer"
) ? static_cast<void> (0) : __assert_fail ("Active->DeductionInfo && \"Missing deduction info pointer\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 856, __PRETTY_FUNCTION__))
;
857 return Active->DeductionInfo;
858
859 case CodeSynthesisContext::DeclaringSpecialMember:
860 case CodeSynthesisContext::DeclaringImplicitEqualityComparison:
861 case CodeSynthesisContext::DefiningSynthesizedFunction:
862 case CodeSynthesisContext::RewritingOperatorAsSpaceship:
863 // This happens in a context unrelated to template instantiation, so
864 // there is no SFINAE.
865 return None;
866
867 case CodeSynthesisContext::ExceptionSpecEvaluation:
868 // FIXME: This should not be treated as a SFINAE context, because
869 // we will cache an incorrect exception specification. However, clang
870 // bootstrap relies this! See PR31692.
871 break;
872
873 case CodeSynthesisContext::Memoization:
874 break;
875 }
876
877 // The inner context was transparent for SFINAE. If it occurred within a
878 // non-instantiation SFINAE context, then SFINAE applies.
879 if (Active->SavedInNonInstantiationSFINAEContext)
880 return Optional<TemplateDeductionInfo *>(nullptr);
881 }
882
883 return None;
884}
885
886//===----------------------------------------------------------------------===/
887// Template Instantiation for Types
888//===----------------------------------------------------------------------===/
889namespace {
890 class TemplateInstantiator : public TreeTransform<TemplateInstantiator> {
891 const MultiLevelTemplateArgumentList &TemplateArgs;
892 SourceLocation Loc;
893 DeclarationName Entity;
894
895 public:
896 typedef TreeTransform<TemplateInstantiator> inherited;
897
898 TemplateInstantiator(Sema &SemaRef,
899 const MultiLevelTemplateArgumentList &TemplateArgs,
900 SourceLocation Loc,
901 DeclarationName Entity)
902 : inherited(SemaRef), TemplateArgs(TemplateArgs), Loc(Loc),
903 Entity(Entity) { }
904
905 /// Determine whether the given type \p T has already been
906 /// transformed.
907 ///
908 /// For the purposes of template instantiation, a type has already been
909 /// transformed if it is NULL or if it is not dependent.
910 bool AlreadyTransformed(QualType T);
911
912 /// Returns the location of the entity being instantiated, if known.
913 SourceLocation getBaseLocation() { return Loc; }
914
915 /// Returns the name of the entity being instantiated, if any.
916 DeclarationName getBaseEntity() { return Entity; }
917
918 /// Sets the "base" location and entity when that
919 /// information is known based on another transformation.
920 void setBase(SourceLocation Loc, DeclarationName Entity) {
921 this->Loc = Loc;
922 this->Entity = Entity;
923 }
924
925 bool TryExpandParameterPacks(SourceLocation EllipsisLoc,
926 SourceRange PatternRange,
927 ArrayRef<UnexpandedParameterPack> Unexpanded,
928 bool &ShouldExpand, bool &RetainExpansion,
929 Optional<unsigned> &NumExpansions) {
930 return getSema().CheckParameterPacksForExpansion(EllipsisLoc,
931 PatternRange, Unexpanded,
932 TemplateArgs,
933 ShouldExpand,
934 RetainExpansion,
935 NumExpansions);
936 }
937
938 void ExpandingFunctionParameterPack(ParmVarDecl *Pack) {
939 SemaRef.CurrentInstantiationScope->MakeInstantiatedLocalArgPack(Pack);
940 }
941
942 TemplateArgument ForgetPartiallySubstitutedPack() {
943 TemplateArgument Result;
944 if (NamedDecl *PartialPack
945 = SemaRef.CurrentInstantiationScope->getPartiallySubstitutedPack()){
946 MultiLevelTemplateArgumentList &TemplateArgs
947 = const_cast<MultiLevelTemplateArgumentList &>(this->TemplateArgs);
948 unsigned Depth, Index;
949 std::tie(Depth, Index) = getDepthAndIndex(PartialPack);
950 if (TemplateArgs.hasTemplateArgument(Depth, Index)) {
951 Result = TemplateArgs(Depth, Index);
952 TemplateArgs.setArgument(Depth, Index, TemplateArgument());
953 }
954 }
955
956 return Result;
957 }
958
959 void RememberPartiallySubstitutedPack(TemplateArgument Arg) {
960 if (Arg.isNull())
961 return;
962
963 if (NamedDecl *PartialPack
964 = SemaRef.CurrentInstantiationScope->getPartiallySubstitutedPack()){
965 MultiLevelTemplateArgumentList &TemplateArgs
966 = const_cast<MultiLevelTemplateArgumentList &>(this->TemplateArgs);
967 unsigned Depth, Index;
968 std::tie(Depth, Index) = getDepthAndIndex(PartialPack);
969 TemplateArgs.setArgument(Depth, Index, Arg);
970 }
971 }
972
973 /// Transform the given declaration by instantiating a reference to
974 /// this declaration.
975 Decl *TransformDecl(SourceLocation Loc, Decl *D);
976
977 void transformAttrs(Decl *Old, Decl *New) {
978 SemaRef.InstantiateAttrs(TemplateArgs, Old, New);
979 }
980
981 void transformedLocalDecl(Decl *Old, ArrayRef<Decl *> NewDecls) {
982 if (Old->isParameterPack()) {
983 SemaRef.CurrentInstantiationScope->MakeInstantiatedLocalArgPack(Old);
984 for (auto *New : NewDecls)
985 SemaRef.CurrentInstantiationScope->InstantiatedLocalPackArg(
986 Old, cast<VarDecl>(New));
987 return;
988 }
989
990 assert(NewDecls.size() == 1 &&((NewDecls.size() == 1 && "should only have multiple expansions for a pack"
) ? static_cast<void> (0) : __assert_fail ("NewDecls.size() == 1 && \"should only have multiple expansions for a pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 991, __PRETTY_FUNCTION__))
991 "should only have multiple expansions for a pack")((NewDecls.size() == 1 && "should only have multiple expansions for a pack"
) ? static_cast<void> (0) : __assert_fail ("NewDecls.size() == 1 && \"should only have multiple expansions for a pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 991, __PRETTY_FUNCTION__))
;
992 Decl *New = NewDecls.front();
993
994 // If we've instantiated the call operator of a lambda or the call
995 // operator template of a generic lambda, update the "instantiation of"
996 // information.
997 auto *NewMD = dyn_cast<CXXMethodDecl>(New);
998 if (NewMD && isLambdaCallOperator(NewMD)) {
999 auto *OldMD = dyn_cast<CXXMethodDecl>(Old);
1000 if (auto *NewTD = NewMD->getDescribedFunctionTemplate())
1001 NewTD->setInstantiatedFromMemberTemplate(
1002 OldMD->getDescribedFunctionTemplate());
1003 else
1004 NewMD->setInstantiationOfMemberFunction(OldMD,
1005 TSK_ImplicitInstantiation);
1006 }
1007
1008 SemaRef.CurrentInstantiationScope->InstantiatedLocal(Old, New);
1009
1010 // We recreated a local declaration, but not by instantiating it. There
1011 // may be pending dependent diagnostics to produce.
1012 if (auto *DC = dyn_cast<DeclContext>(Old))
1013 SemaRef.PerformDependentDiagnostics(DC, TemplateArgs);
1014 }
1015
1016 /// Transform the definition of the given declaration by
1017 /// instantiating it.
1018 Decl *TransformDefinition(SourceLocation Loc, Decl *D);
1019
1020 /// Transform the first qualifier within a scope by instantiating the
1021 /// declaration.
1022 NamedDecl *TransformFirstQualifierInScope(NamedDecl *D, SourceLocation Loc);
1023
1024 /// Rebuild the exception declaration and register the declaration
1025 /// as an instantiated local.
1026 VarDecl *RebuildExceptionDecl(VarDecl *ExceptionDecl,
1027 TypeSourceInfo *Declarator,
1028 SourceLocation StartLoc,
1029 SourceLocation NameLoc,
1030 IdentifierInfo *Name);
1031
1032 /// Rebuild the Objective-C exception declaration and register the
1033 /// declaration as an instantiated local.
1034 VarDecl *RebuildObjCExceptionDecl(VarDecl *ExceptionDecl,
1035 TypeSourceInfo *TSInfo, QualType T);
1036
1037 /// Check for tag mismatches when instantiating an
1038 /// elaborated type.
1039 QualType RebuildElaboratedType(SourceLocation KeywordLoc,
1040 ElaboratedTypeKeyword Keyword,
1041 NestedNameSpecifierLoc QualifierLoc,
1042 QualType T);
1043
1044 TemplateName
1045 TransformTemplateName(CXXScopeSpec &SS, TemplateName Name,
1046 SourceLocation NameLoc,
1047 QualType ObjectType = QualType(),
1048 NamedDecl *FirstQualifierInScope = nullptr,
1049 bool AllowInjectedClassName = false);
1050
1051 const LoopHintAttr *TransformLoopHintAttr(const LoopHintAttr *LH);
1052
1053 ExprResult TransformPredefinedExpr(PredefinedExpr *E);
1054 ExprResult TransformDeclRefExpr(DeclRefExpr *E);
1055 ExprResult TransformCXXDefaultArgExpr(CXXDefaultArgExpr *E);
1056
1057 ExprResult TransformTemplateParmRefExpr(DeclRefExpr *E,
1058 NonTypeTemplateParmDecl *D);
1059 ExprResult TransformSubstNonTypeTemplateParmPackExpr(
1060 SubstNonTypeTemplateParmPackExpr *E);
1061 ExprResult TransformSubstNonTypeTemplateParmExpr(
1062 SubstNonTypeTemplateParmExpr *E);
1063
1064 /// Rebuild a DeclRefExpr for a VarDecl reference.
1065 ExprResult RebuildVarDeclRefExpr(VarDecl *PD, SourceLocation Loc);
1066
1067 /// Transform a reference to a function or init-capture parameter pack.
1068 ExprResult TransformFunctionParmPackRefExpr(DeclRefExpr *E, VarDecl *PD);
1069
1070 /// Transform a FunctionParmPackExpr which was built when we couldn't
1071 /// expand a function parameter pack reference which refers to an expanded
1072 /// pack.
1073 ExprResult TransformFunctionParmPackExpr(FunctionParmPackExpr *E);
1074
1075 QualType TransformFunctionProtoType(TypeLocBuilder &TLB,
1076 FunctionProtoTypeLoc TL) {
1077 // Call the base version; it will forward to our overridden version below.
1078 return inherited::TransformFunctionProtoType(TLB, TL);
1079 }
1080
1081 template<typename Fn>
1082 QualType TransformFunctionProtoType(TypeLocBuilder &TLB,
1083 FunctionProtoTypeLoc TL,
1084 CXXRecordDecl *ThisContext,
1085 Qualifiers ThisTypeQuals,
1086 Fn TransformExceptionSpec);
1087
1088 ParmVarDecl *TransformFunctionTypeParam(ParmVarDecl *OldParm,
1089 int indexAdjustment,
1090 Optional<unsigned> NumExpansions,
1091 bool ExpectParameterPack);
1092
1093 /// Transforms a template type parameter type by performing
1094 /// substitution of the corresponding template type argument.
1095 QualType TransformTemplateTypeParmType(TypeLocBuilder &TLB,
1096 TemplateTypeParmTypeLoc TL);
1097
1098 /// Transforms an already-substituted template type parameter pack
1099 /// into either itself (if we aren't substituting into its pack expansion)
1100 /// or the appropriate substituted argument.
1101 QualType TransformSubstTemplateTypeParmPackType(TypeLocBuilder &TLB,
1102 SubstTemplateTypeParmPackTypeLoc TL);
1103
1104 ExprResult TransformLambdaExpr(LambdaExpr *E) {
1105 LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true);
1106 return TreeTransform<TemplateInstantiator>::TransformLambdaExpr(E);
1107 }
1108
1109 ExprResult TransformRequiresExpr(RequiresExpr *E) {
1110 LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true);
1111 return TreeTransform<TemplateInstantiator>::TransformRequiresExpr(E);
1112 }
1113
1114 bool TransformRequiresExprRequirements(
1115 ArrayRef<concepts::Requirement *> Reqs,
1116 SmallVectorImpl<concepts::Requirement *> &Transformed) {
1117 bool SatisfactionDetermined = false;
1118 for (concepts::Requirement *Req : Reqs) {
1119 concepts::Requirement *TransReq = nullptr;
1120 if (!SatisfactionDetermined) {
1121 if (auto *TypeReq = dyn_cast<concepts::TypeRequirement>(Req))
1122 TransReq = TransformTypeRequirement(TypeReq);
1123 else if (auto *ExprReq = dyn_cast<concepts::ExprRequirement>(Req))
1124 TransReq = TransformExprRequirement(ExprReq);
1125 else
1126 TransReq = TransformNestedRequirement(
1127 cast<concepts::NestedRequirement>(Req));
1128 if (!TransReq)
1129 return true;
1130 if (!TransReq->isDependent() && !TransReq->isSatisfied())
1131 // [expr.prim.req]p6
1132 // [...] The substitution and semantic constraint checking
1133 // proceeds in lexical order and stops when a condition that
1134 // determines the result of the requires-expression is
1135 // encountered. [..]
1136 SatisfactionDetermined = true;
1137 } else
1138 TransReq = Req;
1139 Transformed.push_back(TransReq);
1140 }
1141 return false;
1142 }
1143
1144 TemplateParameterList *TransformTemplateParameterList(
1145 TemplateParameterList *OrigTPL) {
1146 if (!OrigTPL || !OrigTPL->size()) return OrigTPL;
1147
1148 DeclContext *Owner = OrigTPL->getParam(0)->getDeclContext();
1149 TemplateDeclInstantiator DeclInstantiator(getSema(),
1150 /* DeclContext *Owner */ Owner, TemplateArgs);
1151 return DeclInstantiator.SubstTemplateParams(OrigTPL);
1152 }
1153
1154 concepts::TypeRequirement *
1155 TransformTypeRequirement(concepts::TypeRequirement *Req);
1156 concepts::ExprRequirement *
1157 TransformExprRequirement(concepts::ExprRequirement *Req);
1158 concepts::NestedRequirement *
1159 TransformNestedRequirement(concepts::NestedRequirement *Req);
1160
1161 private:
1162 ExprResult transformNonTypeTemplateParmRef(NonTypeTemplateParmDecl *parm,
1163 SourceLocation loc,
1164 TemplateArgument arg);
1165 };
1166}
1167
1168bool TemplateInstantiator::AlreadyTransformed(QualType T) {
1169 if (T.isNull())
1170 return true;
1171
1172 if (T->isInstantiationDependentType() || T->isVariablyModifiedType())
1173 return false;
1174
1175 getSema().MarkDeclarationsReferencedInType(Loc, T);
1176 return true;
1177}
1178
1179static TemplateArgument
1180getPackSubstitutedTemplateArgument(Sema &S, TemplateArgument Arg) {
1181 assert(S.ArgumentPackSubstitutionIndex >= 0)((S.ArgumentPackSubstitutionIndex >= 0) ? static_cast<void
> (0) : __assert_fail ("S.ArgumentPackSubstitutionIndex >= 0"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1181, __PRETTY_FUNCTION__))
;
1182 assert(S.ArgumentPackSubstitutionIndex < (int)Arg.pack_size())((S.ArgumentPackSubstitutionIndex < (int)Arg.pack_size()) ?
static_cast<void> (0) : __assert_fail ("S.ArgumentPackSubstitutionIndex < (int)Arg.pack_size()"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1182, __PRETTY_FUNCTION__))
;
1183 Arg = Arg.pack_begin()[S.ArgumentPackSubstitutionIndex];
1184 if (Arg.isPackExpansion())
1185 Arg = Arg.getPackExpansionPattern();
1186 return Arg;
1187}
1188
1189Decl *TemplateInstantiator::TransformDecl(SourceLocation Loc, Decl *D) {
1190 if (!D)
1191 return nullptr;
1192
1193 if (TemplateTemplateParmDecl *TTP = dyn_cast<TemplateTemplateParmDecl>(D)) {
1194 if (TTP->getDepth() < TemplateArgs.getNumLevels()) {
1195 // If the corresponding template argument is NULL or non-existent, it's
1196 // because we are performing instantiation from explicitly-specified
1197 // template arguments in a function template, but there were some
1198 // arguments left unspecified.
1199 if (!TemplateArgs.hasTemplateArgument(TTP->getDepth(),
1200 TTP->getPosition()))
1201 return D;
1202
1203 TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getPosition());
1204
1205 if (TTP->isParameterPack()) {
1206 assert(Arg.getKind() == TemplateArgument::Pack &&((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1207, __PRETTY_FUNCTION__))
1207 "Missing argument pack")((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1207, __PRETTY_FUNCTION__))
;
1208 Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
1209 }
1210
1211 TemplateName Template = Arg.getAsTemplate().getNameToSubstitute();
1212 assert(!Template.isNull() && Template.getAsTemplateDecl() &&((!Template.isNull() && Template.getAsTemplateDecl() &&
"Wrong kind of template template argument") ? static_cast<
void> (0) : __assert_fail ("!Template.isNull() && Template.getAsTemplateDecl() && \"Wrong kind of template template argument\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1213, __PRETTY_FUNCTION__))
1213 "Wrong kind of template template argument")((!Template.isNull() && Template.getAsTemplateDecl() &&
"Wrong kind of template template argument") ? static_cast<
void> (0) : __assert_fail ("!Template.isNull() && Template.getAsTemplateDecl() && \"Wrong kind of template template argument\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1213, __PRETTY_FUNCTION__))
;
1214 return Template.getAsTemplateDecl();
1215 }
1216
1217 // Fall through to find the instantiated declaration for this template
1218 // template parameter.
1219 }
1220
1221 return SemaRef.FindInstantiatedDecl(Loc, cast<NamedDecl>(D), TemplateArgs);
1222}
1223
1224Decl *TemplateInstantiator::TransformDefinition(SourceLocation Loc, Decl *D) {
1225 Decl *Inst = getSema().SubstDecl(D, getSema().CurContext, TemplateArgs);
1226 if (!Inst)
1227 return nullptr;
1228
1229 getSema().CurrentInstantiationScope->InstantiatedLocal(D, Inst);
1230 return Inst;
1231}
1232
1233NamedDecl *
1234TemplateInstantiator::TransformFirstQualifierInScope(NamedDecl *D,
1235 SourceLocation Loc) {
1236 // If the first part of the nested-name-specifier was a template type
1237 // parameter, instantiate that type parameter down to a tag type.
1238 if (TemplateTypeParmDecl *TTPD = dyn_cast_or_null<TemplateTypeParmDecl>(D)) {
1239 const TemplateTypeParmType *TTP
1240 = cast<TemplateTypeParmType>(getSema().Context.getTypeDeclType(TTPD));
1241
1242 if (TTP->getDepth() < TemplateArgs.getNumLevels()) {
1243 // FIXME: This needs testing w/ member access expressions.
1244 TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getIndex());
1245
1246 if (TTP->isParameterPack()) {
1247 assert(Arg.getKind() == TemplateArgument::Pack &&((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1248, __PRETTY_FUNCTION__))
1248 "Missing argument pack")((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1248, __PRETTY_FUNCTION__))
;
1249
1250 if (getSema().ArgumentPackSubstitutionIndex == -1)
1251 return nullptr;
1252
1253 Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
1254 }
1255
1256 QualType T = Arg.getAsType();
1257 if (T.isNull())
1258 return cast_or_null<NamedDecl>(TransformDecl(Loc, D));
1259
1260 if (const TagType *Tag = T->getAs<TagType>())
1261 return Tag->getDecl();
1262
1263 // The resulting type is not a tag; complain.
1264 getSema().Diag(Loc, diag::err_nested_name_spec_non_tag) << T;
1265 return nullptr;
1266 }
1267 }
1268
1269 return cast_or_null<NamedDecl>(TransformDecl(Loc, D));
1270}
1271
1272VarDecl *
1273TemplateInstantiator::RebuildExceptionDecl(VarDecl *ExceptionDecl,
1274 TypeSourceInfo *Declarator,
1275 SourceLocation StartLoc,
1276 SourceLocation NameLoc,
1277 IdentifierInfo *Name) {
1278 VarDecl *Var = inherited::RebuildExceptionDecl(ExceptionDecl, Declarator,
1279 StartLoc, NameLoc, Name);
1280 if (Var)
1281 getSema().CurrentInstantiationScope->InstantiatedLocal(ExceptionDecl, Var);
1282 return Var;
1283}
1284
1285VarDecl *TemplateInstantiator::RebuildObjCExceptionDecl(VarDecl *ExceptionDecl,
1286 TypeSourceInfo *TSInfo,
1287 QualType T) {
1288 VarDecl *Var = inherited::RebuildObjCExceptionDecl(ExceptionDecl, TSInfo, T);
1289 if (Var)
1290 getSema().CurrentInstantiationScope->InstantiatedLocal(ExceptionDecl, Var);
1291 return Var;
1292}
1293
1294QualType
1295TemplateInstantiator::RebuildElaboratedType(SourceLocation KeywordLoc,
1296 ElaboratedTypeKeyword Keyword,
1297 NestedNameSpecifierLoc QualifierLoc,
1298 QualType T) {
1299 if (const TagType *TT = T->getAs<TagType>()) {
1300 TagDecl* TD = TT->getDecl();
1301
1302 SourceLocation TagLocation = KeywordLoc;
1303
1304 IdentifierInfo *Id = TD->getIdentifier();
1305
1306 // TODO: should we even warn on struct/class mismatches for this? Seems
1307 // like it's likely to produce a lot of spurious errors.
1308 if (Id && Keyword != ETK_None && Keyword != ETK_Typename) {
1309 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForKeyword(Keyword);
1310 if (!SemaRef.isAcceptableTagRedeclaration(TD, Kind, /*isDefinition*/false,
1311 TagLocation, Id)) {
1312 SemaRef.Diag(TagLocation, diag::err_use_with_wrong_tag)
1313 << Id
1314 << FixItHint::CreateReplacement(SourceRange(TagLocation),
1315 TD->getKindName());
1316 SemaRef.Diag(TD->getLocation(), diag::note_previous_use);
1317 }
1318 }
1319 }
1320
1321 return TreeTransform<TemplateInstantiator>::RebuildElaboratedType(KeywordLoc,
1322 Keyword,
1323 QualifierLoc,
1324 T);
1325}
1326
1327TemplateName TemplateInstantiator::TransformTemplateName(
1328 CXXScopeSpec &SS, TemplateName Name, SourceLocation NameLoc,
1329 QualType ObjectType, NamedDecl *FirstQualifierInScope,
1330 bool AllowInjectedClassName) {
1331 if (TemplateTemplateParmDecl *TTP
1332 = dyn_cast_or_null<TemplateTemplateParmDecl>(Name.getAsTemplateDecl())) {
1333 if (TTP->getDepth() < TemplateArgs.getNumLevels()) {
1334 // If the corresponding template argument is NULL or non-existent, it's
1335 // because we are performing instantiation from explicitly-specified
1336 // template arguments in a function template, but there were some
1337 // arguments left unspecified.
1338 if (!TemplateArgs.hasTemplateArgument(TTP->getDepth(),
1339 TTP->getPosition()))
1340 return Name;
1341
1342 TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getPosition());
1343
1344 if (TTP->isParameterPack()) {
1345 assert(Arg.getKind() == TemplateArgument::Pack &&((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1346, __PRETTY_FUNCTION__))
1346 "Missing argument pack")((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1346, __PRETTY_FUNCTION__))
;
1347
1348 if (getSema().ArgumentPackSubstitutionIndex == -1) {
1349 // We have the template argument pack to substitute, but we're not
1350 // actually expanding the enclosing pack expansion yet. So, just
1351 // keep the entire argument pack.
1352 return getSema().Context.getSubstTemplateTemplateParmPack(TTP, Arg);
1353 }
1354
1355 Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
1356 }
1357
1358 TemplateName Template = Arg.getAsTemplate().getNameToSubstitute();
1359 assert(!Template.isNull() && "Null template template argument")((!Template.isNull() && "Null template template argument"
) ? static_cast<void> (0) : __assert_fail ("!Template.isNull() && \"Null template template argument\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1359, __PRETTY_FUNCTION__))
;
1360 assert(!Template.getAsQualifiedTemplateName() &&((!Template.getAsQualifiedTemplateName() && "template decl to substitute is qualified?"
) ? static_cast<void> (0) : __assert_fail ("!Template.getAsQualifiedTemplateName() && \"template decl to substitute is qualified?\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1361, __PRETTY_FUNCTION__))
1361 "template decl to substitute is qualified?")((!Template.getAsQualifiedTemplateName() && "template decl to substitute is qualified?"
) ? static_cast<void> (0) : __assert_fail ("!Template.getAsQualifiedTemplateName() && \"template decl to substitute is qualified?\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1361, __PRETTY_FUNCTION__))
;
1362
1363 Template = getSema().Context.getSubstTemplateTemplateParm(TTP, Template);
1364 return Template;
1365 }
1366 }
1367
1368 if (SubstTemplateTemplateParmPackStorage *SubstPack
1369 = Name.getAsSubstTemplateTemplateParmPack()) {
1370 if (getSema().ArgumentPackSubstitutionIndex == -1)
1371 return Name;
1372
1373 TemplateArgument Arg = SubstPack->getArgumentPack();
1374 Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
1375 return Arg.getAsTemplate().getNameToSubstitute();
1376 }
1377
1378 return inherited::TransformTemplateName(SS, Name, NameLoc, ObjectType,
1379 FirstQualifierInScope,
1380 AllowInjectedClassName);
1381}
1382
1383ExprResult
1384TemplateInstantiator::TransformPredefinedExpr(PredefinedExpr *E) {
1385 if (!E->isTypeDependent())
1386 return E;
1387
1388 return getSema().BuildPredefinedExpr(E->getLocation(), E->getIdentKind());
1389}
1390
1391ExprResult
1392TemplateInstantiator::TransformTemplateParmRefExpr(DeclRefExpr *E,
1393 NonTypeTemplateParmDecl *NTTP) {
1394 // If the corresponding template argument is NULL or non-existent, it's
1395 // because we are performing instantiation from explicitly-specified
1396 // template arguments in a function template, but there were some
1397 // arguments left unspecified.
1398 if (!TemplateArgs.hasTemplateArgument(NTTP->getDepth(),
1399 NTTP->getPosition()))
1400 return E;
1401
1402 TemplateArgument Arg = TemplateArgs(NTTP->getDepth(), NTTP->getPosition());
1403
1404 if (TemplateArgs.getNumLevels() != TemplateArgs.getNumSubstitutedLevels()) {
1405 // We're performing a partial substitution, so the substituted argument
1406 // could be dependent. As a result we can't create a SubstNonType*Expr
1407 // node now, since that represents a fully-substituted argument.
1408 // FIXME: We should have some AST representation for this.
1409 if (Arg.getKind() == TemplateArgument::Pack) {
1410 // FIXME: This won't work for alias templates.
1411 assert(Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() &&((Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion
() && "unexpected pack arguments in partial substitution"
) ? static_cast<void> (0) : __assert_fail ("Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() && \"unexpected pack arguments in partial substitution\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1412, __PRETTY_FUNCTION__))
1412 "unexpected pack arguments in partial substitution")((Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion
() && "unexpected pack arguments in partial substitution"
) ? static_cast<void> (0) : __assert_fail ("Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() && \"unexpected pack arguments in partial substitution\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1412, __PRETTY_FUNCTION__))
;
1413 Arg = Arg.pack_begin()->getPackExpansionPattern();
1414 }
1415 assert(Arg.getKind() == TemplateArgument::Expression &&((Arg.getKind() == TemplateArgument::Expression && "unexpected nontype template argument kind in partial substitution"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Expression && \"unexpected nontype template argument kind in partial substitution\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1416, __PRETTY_FUNCTION__))
1416 "unexpected nontype template argument kind in partial substitution")((Arg.getKind() == TemplateArgument::Expression && "unexpected nontype template argument kind in partial substitution"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Expression && \"unexpected nontype template argument kind in partial substitution\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1416, __PRETTY_FUNCTION__))
;
1417 return Arg.getAsExpr();
1418 }
1419
1420 if (NTTP->isParameterPack()) {
1421 assert(Arg.getKind() == TemplateArgument::Pack &&((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1422, __PRETTY_FUNCTION__))
1422 "Missing argument pack")((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1422, __PRETTY_FUNCTION__))
;
1423
1424 if (getSema().ArgumentPackSubstitutionIndex == -1) {
1425 // We have an argument pack, but we can't select a particular argument
1426 // out of it yet. Therefore, we'll build an expression to hold on to that
1427 // argument pack.
1428 QualType TargetType = SemaRef.SubstType(NTTP->getType(), TemplateArgs,
1429 E->getLocation(),
1430 NTTP->getDeclName());
1431 if (TargetType.isNull())
1432 return ExprError();
1433
1434 return new (SemaRef.Context) SubstNonTypeTemplateParmPackExpr(
1435 TargetType.getNonLValueExprType(SemaRef.Context),
1436 TargetType->isReferenceType() ? VK_LValue : VK_RValue, NTTP,
1437 E->getLocation(), Arg);
1438 }
1439
1440 Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
1441 }
1442
1443 return transformNonTypeTemplateParmRef(NTTP, E->getLocation(), Arg);
1444}
1445
1446const LoopHintAttr *
1447TemplateInstantiator::TransformLoopHintAttr(const LoopHintAttr *LH) {
1448 Expr *TransformedExpr = getDerived().TransformExpr(LH->getValue()).get();
1449
1450 if (TransformedExpr == LH->getValue())
1451 return LH;
1452
1453 // Generate error if there is a problem with the value.
1454 if (getSema().CheckLoopHintExpr(TransformedExpr, LH->getLocation()))
1455 return LH;
1456
1457 // Create new LoopHintValueAttr with integral expression in place of the
1458 // non-type template parameter.
1459 return LoopHintAttr::CreateImplicit(getSema().Context, LH->getOption(),
1460 LH->getState(), TransformedExpr, *LH);
1461}
1462
1463ExprResult TemplateInstantiator::transformNonTypeTemplateParmRef(
1464 NonTypeTemplateParmDecl *parm,
1465 SourceLocation loc,
1466 TemplateArgument arg) {
1467 ExprResult result;
1468 QualType type;
1469
1470 // The template argument itself might be an expression, in which
1471 // case we just return that expression.
1472 if (arg.getKind() == TemplateArgument::Expression) {
1473 Expr *argExpr = arg.getAsExpr();
1474 result = argExpr;
1475 type = argExpr->getType();
1476
1477 } else if (arg.getKind() == TemplateArgument::Declaration ||
1478 arg.getKind() == TemplateArgument::NullPtr) {
1479 ValueDecl *VD;
1480 if (arg.getKind() == TemplateArgument::Declaration) {
1481 VD = arg.getAsDecl();
1482
1483 // Find the instantiation of the template argument. This is
1484 // required for nested templates.
1485 VD = cast_or_null<ValueDecl>(
1486 getSema().FindInstantiatedDecl(loc, VD, TemplateArgs));
1487 if (!VD)
1488 return ExprError();
1489 } else {
1490 // Propagate NULL template argument.
1491 VD = nullptr;
1492 }
1493
1494 // Derive the type we want the substituted decl to have. This had
1495 // better be non-dependent, or these checks will have serious problems.
1496 if (parm->isExpandedParameterPack()) {
1497 type = parm->getExpansionType(SemaRef.ArgumentPackSubstitutionIndex);
1498 } else if (parm->isParameterPack() &&
1499 isa<PackExpansionType>(parm->getType())) {
1500 type = SemaRef.SubstType(
1501 cast<PackExpansionType>(parm->getType())->getPattern(),
1502 TemplateArgs, loc, parm->getDeclName());
1503 } else {
1504 type = SemaRef.SubstType(VD ? arg.getParamTypeForDecl() : arg.getNullPtrType(),
1505 TemplateArgs, loc, parm->getDeclName());
1506 }
1507 assert(!type.isNull() && "type substitution failed for param type")((!type.isNull() && "type substitution failed for param type"
) ? static_cast<void> (0) : __assert_fail ("!type.isNull() && \"type substitution failed for param type\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1507, __PRETTY_FUNCTION__))
;
1508 assert(!type->isDependentType() && "param type still dependent")((!type->isDependentType() && "param type still dependent"
) ? static_cast<void> (0) : __assert_fail ("!type->isDependentType() && \"param type still dependent\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1508, __PRETTY_FUNCTION__))
;
1509 result = SemaRef.BuildExpressionFromDeclTemplateArgument(arg, type, loc);
1510
1511 if (!result.isInvalid()) type = result.get()->getType();
1512 } else {
1513 result = SemaRef.BuildExpressionFromIntegralTemplateArgument(arg, loc);
1514
1515 // Note that this type can be different from the type of 'result',
1516 // e.g. if it's an enum type.
1517 type = arg.getIntegralType();
1518 }
1519 if (result.isInvalid()) return ExprError();
1520
1521 Expr *resultExpr = result.get();
1522 return new (SemaRef.Context) SubstNonTypeTemplateParmExpr(
1523 type, resultExpr->getValueKind(), loc, parm, resultExpr);
1524}
1525
1526ExprResult
1527TemplateInstantiator::TransformSubstNonTypeTemplateParmPackExpr(
1528 SubstNonTypeTemplateParmPackExpr *E) {
1529 if (getSema().ArgumentPackSubstitutionIndex == -1) {
1530 // We aren't expanding the parameter pack, so just return ourselves.
1531 return E;
1532 }
1533
1534 TemplateArgument Arg = E->getArgumentPack();
1535 Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
1536 return transformNonTypeTemplateParmRef(E->getParameterPack(),
1537 E->getParameterPackLocation(),
1538 Arg);
1539}
1540
1541ExprResult
1542TemplateInstantiator::TransformSubstNonTypeTemplateParmExpr(
1543 SubstNonTypeTemplateParmExpr *E) {
1544 ExprResult SubstReplacement = TransformExpr(E->getReplacement());
1545 if (SubstReplacement.isInvalid())
1546 return true;
1547 QualType SubstType = TransformType(E->getType());
1548 if (SubstType.isNull())
1549 return true;
1550 // The type may have been previously dependent and not now, which means we
1551 // might have to implicit cast the argument to the new type, for example:
1552 // template<auto T, decltype(T) U>
1553 // concept C = sizeof(U) == 4;
1554 // void foo() requires C<2, 'a'> { }
1555 // When normalizing foo(), we first form the normalized constraints of C:
1556 // AtomicExpr(sizeof(U) == 4,
1557 // U=SubstNonTypeTemplateParmExpr(Param=U,
1558 // Expr=DeclRef(U),
1559 // Type=decltype(T)))
1560 // Then we substitute T = 2, U = 'a' into the parameter mapping, and need to
1561 // produce:
1562 // AtomicExpr(sizeof(U) == 4,
1563 // U=SubstNonTypeTemplateParmExpr(Param=U,
1564 // Expr=ImpCast(
1565 // decltype(2),
1566 // SubstNTTPE(Param=U, Expr='a',
1567 // Type=char)),
1568 // Type=decltype(2)))
1569 // The call to CheckTemplateArgument here produces the ImpCast.
1570 TemplateArgument Converted;
1571 if (SemaRef.CheckTemplateArgument(E->getParameter(), SubstType,
1572 SubstReplacement.get(),
1573 Converted).isInvalid())
1574 return true;
1575 return transformNonTypeTemplateParmRef(E->getParameter(),
1576 E->getExprLoc(), Converted);
1577}
1578
1579ExprResult TemplateInstantiator::RebuildVarDeclRefExpr(VarDecl *PD,
1580 SourceLocation Loc) {
1581 DeclarationNameInfo NameInfo(PD->getDeclName(), Loc);
1582 return getSema().BuildDeclarationNameExpr(CXXScopeSpec(), NameInfo, PD);
1583}
1584
1585ExprResult
1586TemplateInstantiator::TransformFunctionParmPackExpr(FunctionParmPackExpr *E) {
1587 if (getSema().ArgumentPackSubstitutionIndex != -1) {
1588 // We can expand this parameter pack now.
1589 VarDecl *D = E->getExpansion(getSema().ArgumentPackSubstitutionIndex);
1590 VarDecl *VD = cast_or_null<VarDecl>(TransformDecl(E->getExprLoc(), D));
1591 if (!VD)
1592 return ExprError();
1593 return RebuildVarDeclRefExpr(VD, E->getExprLoc());
1594 }
1595
1596 QualType T = TransformType(E->getType());
1597 if (T.isNull())
1598 return ExprError();
1599
1600 // Transform each of the parameter expansions into the corresponding
1601 // parameters in the instantiation of the function decl.
1602 SmallVector<VarDecl *, 8> Vars;
1603 Vars.reserve(E->getNumExpansions());
1604 for (FunctionParmPackExpr::iterator I = E->begin(), End = E->end();
1605 I != End; ++I) {
1606 VarDecl *D = cast_or_null<VarDecl>(TransformDecl(E->getExprLoc(), *I));
1607 if (!D)
1608 return ExprError();
1609 Vars.push_back(D);
1610 }
1611
1612 auto *PackExpr =
1613 FunctionParmPackExpr::Create(getSema().Context, T, E->getParameterPack(),
1614 E->getParameterPackLocation(), Vars);
1615 getSema().MarkFunctionParmPackReferenced(PackExpr);
1616 return PackExpr;
1617}
1618
1619ExprResult
1620TemplateInstantiator::TransformFunctionParmPackRefExpr(DeclRefExpr *E,
1621 VarDecl *PD) {
1622 typedef LocalInstantiationScope::DeclArgumentPack DeclArgumentPack;
1623 llvm::PointerUnion<Decl *, DeclArgumentPack *> *Found
1624 = getSema().CurrentInstantiationScope->findInstantiationOf(PD);
1625 assert(Found && "no instantiation for parameter pack")((Found && "no instantiation for parameter pack") ? static_cast
<void> (0) : __assert_fail ("Found && \"no instantiation for parameter pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1625, __PRETTY_FUNCTION__))
;
1626
1627 Decl *TransformedDecl;
1628 if (DeclArgumentPack *Pack = Found->dyn_cast<DeclArgumentPack *>()) {
1629 // If this is a reference to a function parameter pack which we can
1630 // substitute but can't yet expand, build a FunctionParmPackExpr for it.
1631 if (getSema().ArgumentPackSubstitutionIndex == -1) {
1632 QualType T = TransformType(E->getType());
1633 if (T.isNull())
1634 return ExprError();
1635 auto *PackExpr = FunctionParmPackExpr::Create(getSema().Context, T, PD,
1636 E->getExprLoc(), *Pack);
1637 getSema().MarkFunctionParmPackReferenced(PackExpr);
1638 return PackExpr;
1639 }
1640
1641 TransformedDecl = (*Pack)[getSema().ArgumentPackSubstitutionIndex];
1642 } else {
1643 TransformedDecl = Found->get<Decl*>();
1644 }
1645
1646 // We have either an unexpanded pack or a specific expansion.
1647 return RebuildVarDeclRefExpr(cast<VarDecl>(TransformedDecl), E->getExprLoc());
1648}
1649
1650ExprResult
1651TemplateInstantiator::TransformDeclRefExpr(DeclRefExpr *E) {
1652 NamedDecl *D = E->getDecl();
1653
1654 // Handle references to non-type template parameters and non-type template
1655 // parameter packs.
1656 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(D)) {
1657 if (NTTP->getDepth() < TemplateArgs.getNumLevels())
1658 return TransformTemplateParmRefExpr(E, NTTP);
1659
1660 // We have a non-type template parameter that isn't fully substituted;
1661 // FindInstantiatedDecl will find it in the local instantiation scope.
1662 }
1663
1664 // Handle references to function parameter packs.
1665 if (VarDecl *PD = dyn_cast<VarDecl>(D))
1666 if (PD->isParameterPack())
1667 return TransformFunctionParmPackRefExpr(E, PD);
1668
1669 return TreeTransform<TemplateInstantiator>::TransformDeclRefExpr(E);
1670}
1671
1672ExprResult TemplateInstantiator::TransformCXXDefaultArgExpr(
1673 CXXDefaultArgExpr *E) {
1674 assert(!cast<FunctionDecl>(E->getParam()->getDeclContext())->((!cast<FunctionDecl>(E->getParam()->getDeclContext
())-> getDescribedFunctionTemplate() && "Default arg expressions are never formed in dependent cases."
) ? static_cast<void> (0) : __assert_fail ("!cast<FunctionDecl>(E->getParam()->getDeclContext())-> getDescribedFunctionTemplate() && \"Default arg expressions are never formed in dependent cases.\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1676, __PRETTY_FUNCTION__))
1675 getDescribedFunctionTemplate() &&((!cast<FunctionDecl>(E->getParam()->getDeclContext
())-> getDescribedFunctionTemplate() && "Default arg expressions are never formed in dependent cases."
) ? static_cast<void> (0) : __assert_fail ("!cast<FunctionDecl>(E->getParam()->getDeclContext())-> getDescribedFunctionTemplate() && \"Default arg expressions are never formed in dependent cases.\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1676, __PRETTY_FUNCTION__))
1676 "Default arg expressions are never formed in dependent cases.")((!cast<FunctionDecl>(E->getParam()->getDeclContext
())-> getDescribedFunctionTemplate() && "Default arg expressions are never formed in dependent cases."
) ? static_cast<void> (0) : __assert_fail ("!cast<FunctionDecl>(E->getParam()->getDeclContext())-> getDescribedFunctionTemplate() && \"Default arg expressions are never formed in dependent cases.\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1676, __PRETTY_FUNCTION__))
;
1677 return SemaRef.BuildCXXDefaultArgExpr(E->getUsedLocation(),
1678 cast<FunctionDecl>(E->getParam()->getDeclContext()),
1679 E->getParam());
1680}
1681
1682template<typename Fn>
1683QualType TemplateInstantiator::TransformFunctionProtoType(TypeLocBuilder &TLB,
1684 FunctionProtoTypeLoc TL,
1685 CXXRecordDecl *ThisContext,
1686 Qualifiers ThisTypeQuals,
1687 Fn TransformExceptionSpec) {
1688 // We need a local instantiation scope for this function prototype.
1689 LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true);
1690 return inherited::TransformFunctionProtoType(
1691 TLB, TL, ThisContext, ThisTypeQuals, TransformExceptionSpec);
1692}
1693
1694ParmVarDecl *
1695TemplateInstantiator::TransformFunctionTypeParam(ParmVarDecl *OldParm,
1696 int indexAdjustment,
1697 Optional<unsigned> NumExpansions,
1698 bool ExpectParameterPack) {
1699 auto NewParm =
1700 SemaRef.SubstParmVarDecl(OldParm, TemplateArgs, indexAdjustment,
1701 NumExpansions, ExpectParameterPack);
1702 if (NewParm && SemaRef.getLangOpts().OpenCL)
1703 SemaRef.deduceOpenCLAddressSpace(NewParm);
1704 return NewParm;
1705}
1706
1707QualType
1708TemplateInstantiator::TransformTemplateTypeParmType(TypeLocBuilder &TLB,
1709 TemplateTypeParmTypeLoc TL) {
1710 const TemplateTypeParmType *T = TL.getTypePtr();
1711 if (T->getDepth() < TemplateArgs.getNumLevels()) {
1712 // Replace the template type parameter with its corresponding
1713 // template argument.
1714
1715 // If the corresponding template argument is NULL or doesn't exist, it's
1716 // because we are performing instantiation from explicitly-specified
1717 // template arguments in a function template class, but there were some
1718 // arguments left unspecified.
1719 if (!TemplateArgs.hasTemplateArgument(T->getDepth(), T->getIndex())) {
1720 TemplateTypeParmTypeLoc NewTL
1721 = TLB.push<TemplateTypeParmTypeLoc>(TL.getType());
1722 NewTL.setNameLoc(TL.getNameLoc());
1723 return TL.getType();
1724 }
1725
1726 TemplateArgument Arg = TemplateArgs(T->getDepth(), T->getIndex());
1727
1728 if (T->isParameterPack()) {
1729 assert(Arg.getKind() == TemplateArgument::Pack &&((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1730, __PRETTY_FUNCTION__))
1730 "Missing argument pack")((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1730, __PRETTY_FUNCTION__))
;
1731
1732 if (getSema().ArgumentPackSubstitutionIndex == -1) {
1733 // We have the template argument pack, but we're not expanding the
1734 // enclosing pack expansion yet. Just save the template argument
1735 // pack for later substitution.
1736 QualType Result
1737 = getSema().Context.getSubstTemplateTypeParmPackType(T, Arg);
1738 SubstTemplateTypeParmPackTypeLoc NewTL
1739 = TLB.push<SubstTemplateTypeParmPackTypeLoc>(Result);
1740 NewTL.setNameLoc(TL.getNameLoc());
1741 return Result;
1742 }
1743
1744 Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
1745 }
1746
1747 assert(Arg.getKind() == TemplateArgument::Type &&((Arg.getKind() == TemplateArgument::Type && "Template argument kind mismatch"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Type && \"Template argument kind mismatch\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1748, __PRETTY_FUNCTION__))
1748 "Template argument kind mismatch")((Arg.getKind() == TemplateArgument::Type && "Template argument kind mismatch"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Type && \"Template argument kind mismatch\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1748, __PRETTY_FUNCTION__))
;
1749
1750 QualType Replacement = Arg.getAsType();
1751
1752 // TODO: only do this uniquing once, at the start of instantiation.
1753 QualType Result
1754 = getSema().Context.getSubstTemplateTypeParmType(T, Replacement);
1755 SubstTemplateTypeParmTypeLoc NewTL
1756 = TLB.push<SubstTemplateTypeParmTypeLoc>(Result);
1757 NewTL.setNameLoc(TL.getNameLoc());
1758 return Result;
1759 }
1760
1761 // The template type parameter comes from an inner template (e.g.,
1762 // the template parameter list of a member template inside the
1763 // template we are instantiating). Create a new template type
1764 // parameter with the template "level" reduced by one.
1765 TemplateTypeParmDecl *NewTTPDecl = nullptr;
1766 if (TemplateTypeParmDecl *OldTTPDecl = T->getDecl())
1767 NewTTPDecl = cast_or_null<TemplateTypeParmDecl>(
1768 TransformDecl(TL.getNameLoc(), OldTTPDecl));
1769
1770 QualType Result = getSema().Context.getTemplateTypeParmType(
1771 T->getDepth() - TemplateArgs.getNumSubstitutedLevels(), T->getIndex(),
1772 T->isParameterPack(), NewTTPDecl);
1773 TemplateTypeParmTypeLoc NewTL = TLB.push<TemplateTypeParmTypeLoc>(Result);
1774 NewTL.setNameLoc(TL.getNameLoc());
1775 return Result;
1776}
1777
1778QualType
1779TemplateInstantiator::TransformSubstTemplateTypeParmPackType(
1780 TypeLocBuilder &TLB,
1781 SubstTemplateTypeParmPackTypeLoc TL) {
1782 if (getSema().ArgumentPackSubstitutionIndex == -1) {
1783 // We aren't expanding the parameter pack, so just return ourselves.
1784 SubstTemplateTypeParmPackTypeLoc NewTL
1785 = TLB.push<SubstTemplateTypeParmPackTypeLoc>(TL.getType());
1786 NewTL.setNameLoc(TL.getNameLoc());
1787 return TL.getType();
1788 }
1789
1790 TemplateArgument Arg = TL.getTypePtr()->getArgumentPack();
1791 Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
1792 QualType Result = Arg.getAsType();
1793
1794 Result = getSema().Context.getSubstTemplateTypeParmType(
1795 TL.getTypePtr()->getReplacedParameter(),
1796 Result);
1797 SubstTemplateTypeParmTypeLoc NewTL
1798 = TLB.push<SubstTemplateTypeParmTypeLoc>(Result);
1799 NewTL.setNameLoc(TL.getNameLoc());
1800 return Result;
1801}
1802
1803template<typename EntityPrinter>
1804static concepts::Requirement::SubstitutionDiagnostic *
1805createSubstDiag(Sema &S, TemplateDeductionInfo &Info, EntityPrinter Printer) {
1806 SmallString<128> Message;
1807 SourceLocation ErrorLoc;
1808 if (Info.hasSFINAEDiagnostic()) {
1809 PartialDiagnosticAt PDA(SourceLocation(),
1810 PartialDiagnostic::NullDiagnostic{});
1811 Info.takeSFINAEDiagnostic(PDA);
1812 PDA.second.EmitToString(S.getDiagnostics(), Message);
1813 ErrorLoc = PDA.first;
1814 } else {
1815 ErrorLoc = Info.getLocation();
1816 }
1817 char *MessageBuf = new (S.Context) char[Message.size()];
1818 std::copy(Message.begin(), Message.end(), MessageBuf);
1819 SmallString<128> Entity;
1820 llvm::raw_svector_ostream OS(Entity);
1821 Printer(OS);
1822 char *EntityBuf = new (S.Context) char[Entity.size()];
1823 std::copy(Entity.begin(), Entity.end(), EntityBuf);
1824 return new (S.Context) concepts::Requirement::SubstitutionDiagnostic{
1825 StringRef(EntityBuf, Entity.size()), ErrorLoc,
1826 StringRef(MessageBuf, Message.size())};
1827}
1828
1829concepts::TypeRequirement *
1830TemplateInstantiator::TransformTypeRequirement(concepts::TypeRequirement *Req) {
1831 if (!Req->isDependent() && !AlwaysRebuild())
1832 return Req;
1833 if (Req->isSubstitutionFailure()) {
1834 if (AlwaysRebuild())
1835 return RebuildTypeRequirement(
1836 Req->getSubstitutionDiagnostic());
1837 return Req;
1838 }
1839
1840 Sema::SFINAETrap Trap(SemaRef);
1841 TemplateDeductionInfo Info(Req->getType()->getTypeLoc().getBeginLoc());
1842 Sema::InstantiatingTemplate TypeInst(SemaRef,
1843 Req->getType()->getTypeLoc().getBeginLoc(), Req, Info,
1844 Req->getType()->getTypeLoc().getSourceRange());
1845 if (TypeInst.isInvalid())
1846 return nullptr;
1847 TypeSourceInfo *TransType = TransformType(Req->getType());
1848 if (!TransType || Trap.hasErrorOccurred())
1849 return RebuildTypeRequirement(createSubstDiag(SemaRef, Info,
1850 [&] (llvm::raw_ostream& OS) {
1851 Req->getType()->getType().print(OS, SemaRef.getPrintingPolicy());
1852 }));
1853 return RebuildTypeRequirement(TransType);
1854}
1855
1856concepts::ExprRequirement *
1857TemplateInstantiator::TransformExprRequirement(concepts::ExprRequirement *Req) {
1858 if (!Req->isDependent() && !AlwaysRebuild())
1859 return Req;
1860
1861 Sema::SFINAETrap Trap(SemaRef);
1862 TemplateDeductionInfo Info(Req->getExpr()->getBeginLoc());
1863
1864 llvm::PointerUnion<Expr *, concepts::Requirement::SubstitutionDiagnostic *>
1865 TransExpr;
1866 if (Req->isExprSubstitutionFailure())
1867 TransExpr = Req->getExprSubstitutionDiagnostic();
1868 else {
1869 Sema::InstantiatingTemplate ExprInst(SemaRef, Req->getExpr()->getBeginLoc(),
1870 Req, Info,
1871 Req->getExpr()->getSourceRange());
1872 if (ExprInst.isInvalid())
1873 return nullptr;
1874 ExprResult TransExprRes = TransformExpr(Req->getExpr());
1875 if (TransExprRes.isInvalid() || Trap.hasErrorOccurred())
1876 TransExpr = createSubstDiag(SemaRef, Info,
1877 [&] (llvm::raw_ostream& OS) {
1878 Req->getExpr()->printPretty(OS, nullptr,
1879 SemaRef.getPrintingPolicy());
1880 });
1881 else
1882 TransExpr = TransExprRes.get();
1883 }
1884
1885 llvm::Optional<concepts::ExprRequirement::ReturnTypeRequirement> TransRetReq;
1886 const auto &RetReq = Req->getReturnTypeRequirement();
1887 if (RetReq.isEmpty())
1888 TransRetReq.emplace();
1889 else if (RetReq.isSubstitutionFailure())
1890 TransRetReq.emplace(RetReq.getSubstitutionDiagnostic());
1891 else if (RetReq.isTypeConstraint()) {
1892 TemplateParameterList *OrigTPL =
1893 RetReq.getTypeConstraintTemplateParameterList();
1894 Sema::InstantiatingTemplate TPLInst(SemaRef, OrigTPL->getTemplateLoc(),
1895 Req, Info, OrigTPL->getSourceRange());
1896 if (TPLInst.isInvalid())
1897 return nullptr;
1898 TemplateParameterList *TPL =
1899 TransformTemplateParameterList(OrigTPL);
1900 if (!TPL)
1901 TransRetReq.emplace(createSubstDiag(SemaRef, Info,
1902 [&] (llvm::raw_ostream& OS) {
1903 RetReq.getTypeConstraint()->getImmediatelyDeclaredConstraint()
1904 ->printPretty(OS, nullptr, SemaRef.getPrintingPolicy());
1905 }));
1906 else {
1907 TPLInst.Clear();
1908 TransRetReq.emplace(TPL);
1909 }
1910 }
1911 assert(TransRetReq.hasValue() &&((TransRetReq.hasValue() && "All code paths leading here must set TransRetReq"
) ? static_cast<void> (0) : __assert_fail ("TransRetReq.hasValue() && \"All code paths leading here must set TransRetReq\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1912, __PRETTY_FUNCTION__))
1912 "All code paths leading here must set TransRetReq")((TransRetReq.hasValue() && "All code paths leading here must set TransRetReq"
) ? static_cast<void> (0) : __assert_fail ("TransRetReq.hasValue() && \"All code paths leading here must set TransRetReq\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1912, __PRETTY_FUNCTION__))
;
1913 if (Expr *E = TransExpr.dyn_cast<Expr *>())
1914 return RebuildExprRequirement(E, Req->isSimple(), Req->getNoexceptLoc(),
1915 std::move(*TransRetReq));
1916 return RebuildExprRequirement(
1917 TransExpr.get<concepts::Requirement::SubstitutionDiagnostic *>(),
1918 Req->isSimple(), Req->getNoexceptLoc(), std::move(*TransRetReq));
1919}
1920
1921concepts::NestedRequirement *
1922TemplateInstantiator::TransformNestedRequirement(
1923 concepts::NestedRequirement *Req) {
1924 if (!Req->isDependent() && !AlwaysRebuild())
1925 return Req;
1926 if (Req->isSubstitutionFailure()) {
1927 if (AlwaysRebuild())
1928 return RebuildNestedRequirement(
1929 Req->getSubstitutionDiagnostic());
1930 return Req;
1931 }
1932 Sema::InstantiatingTemplate ReqInst(SemaRef,
1933 Req->getConstraintExpr()->getBeginLoc(), Req,
1934 Sema::InstantiatingTemplate::ConstraintsCheck{},
1935 Req->getConstraintExpr()->getSourceRange());
1936
1937 ExprResult TransConstraint;
1938 TemplateDeductionInfo Info(Req->getConstraintExpr()->getBeginLoc());
1939 {
1940 EnterExpressionEvaluationContext ContextRAII(
1941 SemaRef, Sema::ExpressionEvaluationContext::ConstantEvaluated);
1942 Sema::SFINAETrap Trap(SemaRef);
1943 Sema::InstantiatingTemplate ConstrInst(SemaRef,
1944 Req->getConstraintExpr()->getBeginLoc(), Req, Info,
1945 Req->getConstraintExpr()->getSourceRange());
1946 if (ConstrInst.isInvalid())
1947 return nullptr;
1948 TransConstraint = TransformExpr(Req->getConstraintExpr());
1949 if (TransConstraint.isInvalid() || Trap.hasErrorOccurred())
1950 return RebuildNestedRequirement(createSubstDiag(SemaRef, Info,
1951 [&] (llvm::raw_ostream& OS) {
1952 Req->getConstraintExpr()->printPretty(OS, nullptr,
1953 SemaRef.getPrintingPolicy());
1954 }));
1955 }
1956 return RebuildNestedRequirement(TransConstraint.get());
1957}
1958
1959
1960/// Perform substitution on the type T with a given set of template
1961/// arguments.
1962///
1963/// This routine substitutes the given template arguments into the
1964/// type T and produces the instantiated type.
1965///
1966/// \param T the type into which the template arguments will be
1967/// substituted. If this type is not dependent, it will be returned
1968/// immediately.
1969///
1970/// \param Args the template arguments that will be
1971/// substituted for the top-level template parameters within T.
1972///
1973/// \param Loc the location in the source code where this substitution
1974/// is being performed. It will typically be the location of the
1975/// declarator (if we're instantiating the type of some declaration)
1976/// or the location of the type in the source code (if, e.g., we're
1977/// instantiating the type of a cast expression).
1978///
1979/// \param Entity the name of the entity associated with a declaration
1980/// being instantiated (if any). May be empty to indicate that there
1981/// is no such entity (if, e.g., this is a type that occurs as part of
1982/// a cast expression) or that the entity has no name (e.g., an
1983/// unnamed function parameter).
1984///
1985/// \param AllowDeducedTST Whether a DeducedTemplateSpecializationType is
1986/// acceptable as the top level type of the result.
1987///
1988/// \returns If the instantiation succeeds, the instantiated
1989/// type. Otherwise, produces diagnostics and returns a NULL type.
1990TypeSourceInfo *Sema::SubstType(TypeSourceInfo *T,
1991 const MultiLevelTemplateArgumentList &Args,
1992 SourceLocation Loc,
1993 DeclarationName Entity,
1994 bool AllowDeducedTST) {
1995 assert(!CodeSynthesisContexts.empty() &&((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
"instantiation stack") ? static_cast<void> (0) : __assert_fail
("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1997, __PRETTY_FUNCTION__))
1996 "Cannot perform an instantiation without some context on the "((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
"instantiation stack") ? static_cast<void> (0) : __assert_fail
("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1997, __PRETTY_FUNCTION__))
1997 "instantiation stack")((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
"instantiation stack") ? static_cast<void> (0) : __assert_fail
("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1997, __PRETTY_FUNCTION__))
;
1998
1999 if (!T->getType()->isInstantiationDependentType() &&
2000 !T->getType()->isVariablyModifiedType())
2001 return T;
2002
2003 TemplateInstantiator Instantiator(*this, Args, Loc, Entity);
2004 return AllowDeducedTST ? Instantiator.TransformTypeWithDeducedTST(T)
2005 : Instantiator.TransformType(T);
2006}
2007
2008TypeSourceInfo *Sema::SubstType(TypeLoc TL,
2009 const MultiLevelTemplateArgumentList &Args,
2010 SourceLocation Loc,
2011 DeclarationName Entity) {
2012 assert(!CodeSynthesisContexts.empty() &&((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
"instantiation stack") ? static_cast<void> (0) : __assert_fail
("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2014, __PRETTY_FUNCTION__))
2013 "Cannot perform an instantiation without some context on the "((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
"instantiation stack") ? static_cast<void> (0) : __assert_fail
("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2014, __PRETTY_FUNCTION__))
2014 "instantiation stack")((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
"instantiation stack") ? static_cast<void> (0) : __assert_fail
("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2014, __PRETTY_FUNCTION__))
;
2015
2016 if (TL.getType().isNull())
2017 return nullptr;
2018
2019 if (!TL.getType()->isInstantiationDependentType() &&
2020 !TL.getType()->isVariablyModifiedType()) {
2021 // FIXME: Make a copy of the TypeLoc data here, so that we can
2022 // return a new TypeSourceInfo. Inefficient!
2023 TypeLocBuilder TLB;
2024 TLB.pushFullCopy(TL);
2025 return TLB.getTypeSourceInfo(Context, TL.getType());
2026 }
2027
2028 TemplateInstantiator Instantiator(*this, Args, Loc, Entity);
2029 TypeLocBuilder TLB;
2030 TLB.reserve(TL.getFullDataSize());
2031 QualType Result = Instantiator.TransformType(TLB, TL);
2032 if (Result.isNull())
2033 return nullptr;
2034
2035 return TLB.getTypeSourceInfo(Context, Result);
2036}
2037
2038/// Deprecated form of the above.
2039QualType Sema::SubstType(QualType T,
2040 const MultiLevelTemplateArgumentList &TemplateArgs,
2041 SourceLocation Loc, DeclarationName Entity) {
2042 assert(!CodeSynthesisContexts.empty() &&((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
"instantiation stack") ? static_cast<void> (0) : __assert_fail
("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2044, __PRETTY_FUNCTION__))
2043 "Cannot perform an instantiation without some context on the "((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
"instantiation stack") ? static_cast<void> (0) : __assert_fail
("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2044, __PRETTY_FUNCTION__))
2044 "instantiation stack")((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
"instantiation stack") ? static_cast<void> (0) : __assert_fail
("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2044, __PRETTY_FUNCTION__))
;
2045
2046 // If T is not a dependent type or a variably-modified type, there
2047 // is nothing to do.
2048 if (!T->isInstantiationDependentType() && !T->isVariablyModifiedType())
2049 return T;
2050
2051 TemplateInstantiator Instantiator(*this, TemplateArgs, Loc, Entity);
2052 return Instantiator.TransformType(T);
2053}
2054
2055static bool NeedsInstantiationAsFunctionType(TypeSourceInfo *T) {
2056 if (T->getType()->isInstantiationDependentType() ||
2057 T->getType()->isVariablyModifiedType())
2058 return true;
2059
2060 TypeLoc TL = T->getTypeLoc().IgnoreParens();
2061 if (!TL.getAs<FunctionProtoTypeLoc>())
2062 return false;
2063
2064 FunctionProtoTypeLoc FP = TL.castAs<FunctionProtoTypeLoc>();
2065 for (ParmVarDecl *P : FP.getParams()) {
2066 // This must be synthesized from a typedef.
2067 if (!P) continue;
2068
2069 // If there are any parameters, a new TypeSourceInfo that refers to the
2070 // instantiated parameters must be built.
2071 return true;
2072 }
2073
2074 return false;
2075}
2076
2077/// A form of SubstType intended specifically for instantiating the
2078/// type of a FunctionDecl. Its purpose is solely to force the
2079/// instantiation of default-argument expressions and to avoid
2080/// instantiating an exception-specification.
2081TypeSourceInfo *Sema::SubstFunctionDeclType(TypeSourceInfo *T,
2082 const MultiLevelTemplateArgumentList &Args,
2083 SourceLocation Loc,
2084 DeclarationName Entity,
2085 CXXRecordDecl *ThisContext,
2086 Qualifiers ThisTypeQuals) {
2087 assert(!CodeSynthesisContexts.empty() &&((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
"instantiation stack") ? static_cast<void> (0) : __assert_fail
("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2089, __PRETTY_FUNCTION__))
2088 "Cannot perform an instantiation without some context on the "((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
"instantiation stack") ? static_cast<void> (0) : __assert_fail
("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2089, __PRETTY_FUNCTION__))
2089 "instantiation stack")((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
"instantiation stack") ? static_cast<void> (0) : __assert_fail
("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2089, __PRETTY_FUNCTION__))
;
2090
2091 if (!NeedsInstantiationAsFunctionType(T))
2092 return T;
2093
2094 TemplateInstantiator Instantiator(*this, Args, Loc, Entity);
2095
2096 TypeLocBuilder TLB;
2097
2098 TypeLoc TL = T->getTypeLoc();
2099 TLB.reserve(TL.getFullDataSize());
2100
2101 QualType Result;
2102
2103 if (FunctionProtoTypeLoc Proto =
2104 TL.IgnoreParens().getAs<FunctionProtoTypeLoc>()) {
2105 // Instantiate the type, other than its exception specification. The
2106 // exception specification is instantiated in InitFunctionInstantiation
2107 // once we've built the FunctionDecl.
2108 // FIXME: Set the exception specification to EST_Uninstantiated here,
2109 // instead of rebuilding the function type again later.
2110 Result = Instantiator.TransformFunctionProtoType(
2111 TLB, Proto, ThisContext, ThisTypeQuals,
2112 [](FunctionProtoType::ExceptionSpecInfo &ESI,
2113 bool &Changed) { return false; });
2114 } else {
2115 Result = Instantiator.TransformType(TLB, TL);
2116 }
2117 if (Result.isNull())
2118 return nullptr;
2119
2120 return TLB.getTypeSourceInfo(Context, Result);
2121}
2122
2123bool Sema::SubstExceptionSpec(SourceLocation Loc,
2124 FunctionProtoType::ExceptionSpecInfo &ESI,
2125 SmallVectorImpl<QualType> &ExceptionStorage,
2126 const MultiLevelTemplateArgumentList &Args) {
2127 assert(ESI.Type != EST_Uninstantiated)((ESI.Type != EST_Uninstantiated) ? static_cast<void> (
0) : __assert_fail ("ESI.Type != EST_Uninstantiated", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2127, __PRETTY_FUNCTION__))
;
2128
2129 bool Changed = false;
2130 TemplateInstantiator Instantiator(*this, Args, Loc, DeclarationName());
2131 return Instantiator.TransformExceptionSpec(Loc, ESI, ExceptionStorage,
2132 Changed);
2133}
2134
2135void Sema::SubstExceptionSpec(FunctionDecl *New, const FunctionProtoType *Proto,
2136 const MultiLevelTemplateArgumentList &Args) {
2137 FunctionProtoType::ExceptionSpecInfo ESI =
2138 Proto->getExtProtoInfo().ExceptionSpec;
2139
2140 SmallVector<QualType, 4> ExceptionStorage;
2141 if (SubstExceptionSpec(New->getTypeSourceInfo()->getTypeLoc().getEndLoc(),
2142 ESI, ExceptionStorage, Args))
2143 // On error, recover by dropping the exception specification.
2144 ESI.Type = EST_None;
2145
2146 UpdateExceptionSpec(New, ESI);
2147}
2148
2149namespace {
2150
2151 struct GetContainedInventedTypeParmVisitor :
2152 public TypeVisitor<GetContainedInventedTypeParmVisitor,
2153 TemplateTypeParmDecl *> {
2154 using TypeVisitor<GetContainedInventedTypeParmVisitor,
2155 TemplateTypeParmDecl *>::Visit;
2156
2157 TemplateTypeParmDecl *Visit(QualType T) {
2158 if (T.isNull())
2159 return nullptr;
2160 return Visit(T.getTypePtr());
2161 }
2162 // The deduced type itself.
2163 TemplateTypeParmDecl *VisitTemplateTypeParmType(
2164 const TemplateTypeParmType *T) {
2165 if (!T->getDecl() || !T->getDecl()->isImplicit())
2166 return nullptr;
2167 return T->getDecl();
2168 }
2169
2170 // Only these types can contain 'auto' types, and subsequently be replaced
2171 // by references to invented parameters.
2172
2173 TemplateTypeParmDecl *VisitElaboratedType(const ElaboratedType *T) {
2174 return Visit(T->getNamedType());
2175 }
2176
2177 TemplateTypeParmDecl *VisitPointerType(const PointerType *T) {
2178 return Visit(T->getPointeeType());
2179 }
2180
2181 TemplateTypeParmDecl *VisitBlockPointerType(const BlockPointerType *T) {
2182 return Visit(T->getPointeeType());
2183 }
2184
2185 TemplateTypeParmDecl *VisitReferenceType(const ReferenceType *T) {
2186 return Visit(T->getPointeeTypeAsWritten());
2187 }
2188
2189 TemplateTypeParmDecl *VisitMemberPointerType(const MemberPointerType *T) {
2190 return Visit(T->getPointeeType());
2191 }
2192
2193 TemplateTypeParmDecl *VisitArrayType(const ArrayType *T) {
2194 return Visit(T->getElementType());
2195 }
2196
2197 TemplateTypeParmDecl *VisitDependentSizedExtVectorType(
2198 const DependentSizedExtVectorType *T) {
2199 return Visit(T->getElementType());
2200 }
2201
2202 TemplateTypeParmDecl *VisitVectorType(const VectorType *T) {
2203 return Visit(T->getElementType());
2204 }
2205
2206 TemplateTypeParmDecl *VisitFunctionProtoType(const FunctionProtoType *T) {
2207 return VisitFunctionType(T);
2208 }
2209
2210 TemplateTypeParmDecl *VisitFunctionType(const FunctionType *T) {
2211 return Visit(T->getReturnType());
2212 }
2213
2214 TemplateTypeParmDecl *VisitParenType(const ParenType *T) {
2215 return Visit(T->getInnerType());
2216 }
2217
2218 TemplateTypeParmDecl *VisitAttributedType(const AttributedType *T) {
2219 return Visit(T->getModifiedType());
2220 }
2221
2222 TemplateTypeParmDecl *VisitMacroQualifiedType(const MacroQualifiedType *T) {
2223 return Visit(T->getUnderlyingType());
2224 }
2225
2226 TemplateTypeParmDecl *VisitAdjustedType(const AdjustedType *T) {
2227 return Visit(T->getOriginalType());
2228 }
2229
2230 TemplateTypeParmDecl *VisitPackExpansionType(const PackExpansionType *T) {
2231 return Visit(T->getPattern());
2232 }
2233 };
2234
2235} // namespace
2236
2237ParmVarDecl *Sema::SubstParmVarDecl(ParmVarDecl *OldParm,
2238 const MultiLevelTemplateArgumentList &TemplateArgs,
2239 int indexAdjustment,
2240 Optional<unsigned> NumExpansions,
2241 bool ExpectParameterPack) {
2242 TypeSourceInfo *OldDI = OldParm->getTypeSourceInfo();
2243 TypeSourceInfo *NewDI = nullptr;
2244
2245 TypeLoc OldTL = OldDI->getTypeLoc();
2246 if (PackExpansionTypeLoc ExpansionTL = OldTL.getAs<PackExpansionTypeLoc>()) {
2247
2248 // We have a function parameter pack. Substitute into the pattern of the
2249 // expansion.
2250 NewDI = SubstType(ExpansionTL.getPatternLoc(), TemplateArgs,
2251 OldParm->getLocation(), OldParm->getDeclName());
2252 if (!NewDI)
2253 return nullptr;
2254
2255 if (NewDI->getType()->containsUnexpandedParameterPack()) {
2256 // We still have unexpanded parameter packs, which means that
2257 // our function parameter is still a function parameter pack.
2258 // Therefore, make its type a pack expansion type.
2259 NewDI = CheckPackExpansion(NewDI, ExpansionTL.getEllipsisLoc(),
2260 NumExpansions);
2261 } else if (ExpectParameterPack) {
2262 // We expected to get a parameter pack but didn't (because the type
2263 // itself is not a pack expansion type), so complain. This can occur when
2264 // the substitution goes through an alias template that "loses" the
2265 // pack expansion.
2266 Diag(OldParm->getLocation(),
2267 diag::err_function_parameter_pack_without_parameter_packs)
2268 << NewDI->getType();
2269 return nullptr;
2270 }
2271 } else {
2272 NewDI = SubstType(OldDI, TemplateArgs, OldParm->getLocation(),
2273 OldParm->getDeclName());
2274 }
2275
2276 if (!NewDI)
2277 return nullptr;
2278
2279 if (NewDI->getType()->isVoidType()) {
2280 Diag(OldParm->getLocation(), diag::err_param_with_void_type);
2281 return nullptr;
2282 }
2283
2284 // In abbreviated templates, TemplateTypeParmDecls with possible
2285 // TypeConstraints are created when the parameter list is originally parsed.
2286 // The TypeConstraints can therefore reference other functions parameters in
2287 // the abbreviated function template, which is why we must instantiate them
2288 // here, when the instantiated versions of those referenced parameters are in
2289 // scope.
2290 if (TemplateTypeParmDecl *TTP =
2291 GetContainedInventedTypeParmVisitor().Visit(OldDI->getType())) {
2292 if (const TypeConstraint *TC = TTP->getTypeConstraint()) {
2293 auto *Inst = cast_or_null<TemplateTypeParmDecl>(
2294 FindInstantiatedDecl(TTP->getLocation(), TTP, TemplateArgs));
2295 // We will first get here when instantiating the abbreviated function
2296 // template's described function, but we might also get here later.
2297 // Make sure we do not instantiate the TypeConstraint more than once.
2298 if (Inst && !Inst->getTypeConstraint()) {
2299 // TODO: Concepts: do not instantiate the constraint (delayed constraint
2300 // substitution)
2301 const ASTTemplateArgumentListInfo *TemplArgInfo
2302 = TC->getTemplateArgsAsWritten();
2303 TemplateArgumentListInfo InstArgs;
2304
2305 if (TemplArgInfo) {
2306 InstArgs.setLAngleLoc(TemplArgInfo->LAngleLoc);
2307 InstArgs.setRAngleLoc(TemplArgInfo->RAngleLoc);
2308 if (Subst(TemplArgInfo->getTemplateArgs(),
2309 TemplArgInfo->NumTemplateArgs, InstArgs, TemplateArgs))
2310 return nullptr;
2311 }
2312 if (AttachTypeConstraint(
2313 TC->getNestedNameSpecifierLoc(), TC->getConceptNameInfo(),
2314 TC->getNamedConcept(), &InstArgs, Inst,
2315 TTP->isParameterPack()
2316 ? cast<CXXFoldExpr>(TC->getImmediatelyDeclaredConstraint())
2317 ->getEllipsisLoc()
2318 : SourceLocation()))
2319 return nullptr;
2320 }
2321 }
2322 }
2323
2324 ParmVarDecl *NewParm = CheckParameter(Context.getTranslationUnitDecl(),
2325 OldParm->getInnerLocStart(),
2326 OldParm->getLocation(),
2327 OldParm->getIdentifier(),
2328 NewDI->getType(), NewDI,
2329 OldParm->getStorageClass());
2330 if (!NewParm)
2331 return nullptr;
2332
2333 // Mark the (new) default argument as uninstantiated (if any).
2334 if (OldParm->hasUninstantiatedDefaultArg()) {
2335 Expr *Arg = OldParm->getUninstantiatedDefaultArg();
2336 NewParm->setUninstantiatedDefaultArg(Arg);
2337 } else if (OldParm->hasUnparsedDefaultArg()) {
2338 NewParm->setUnparsedDefaultArg();
2339 UnparsedDefaultArgInstantiations[OldParm].push_back(NewParm);
2340 } else if (Expr *Arg = OldParm->getDefaultArg()) {
2341 FunctionDecl *OwningFunc = cast<FunctionDecl>(OldParm->getDeclContext());
2342 if (OwningFunc->isLexicallyWithinFunctionOrMethod()) {
2343 // Instantiate default arguments for methods of local classes (DR1484)
2344 // and non-defining declarations.
2345 Sema::ContextRAII SavedContext(*this, OwningFunc);
2346 LocalInstantiationScope Local(*this, true);
2347 ExprResult NewArg = SubstExpr(Arg, TemplateArgs);
2348 if (NewArg.isUsable()) {
2349 // It would be nice if we still had this.
2350 SourceLocation EqualLoc = NewArg.get()->getBeginLoc();
2351 SetParamDefaultArgument(NewParm, NewArg.get(), EqualLoc);
2352 }
2353 } else {
2354 // FIXME: if we non-lazily instantiated non-dependent default args for
2355 // non-dependent parameter types we could remove a bunch of duplicate
2356 // conversion warnings for such arguments.
2357 NewParm->setUninstantiatedDefaultArg(Arg);
2358 }
2359 }
2360
2361 NewParm->setHasInheritedDefaultArg(OldParm->hasInheritedDefaultArg());
2362
2363 if (OldParm->isParameterPack() && !NewParm->isParameterPack()) {
2364 // Add the new parameter to the instantiated parameter pack.
2365 CurrentInstantiationScope->InstantiatedLocalPackArg(OldParm, NewParm);
2366 } else {
2367 // Introduce an Old -> New mapping
2368 CurrentInstantiationScope->InstantiatedLocal(OldParm, NewParm);
2369 }
2370
2371 // FIXME: OldParm may come from a FunctionProtoType, in which case CurContext
2372 // can be anything, is this right ?
2373 NewParm->setDeclContext(CurContext);
2374
2375 NewParm->setScopeInfo(OldParm->getFunctionScopeDepth(),
2376 OldParm->getFunctionScopeIndex() + indexAdjustment);
2377
2378 InstantiateAttrs(TemplateArgs, OldParm, NewParm);
2379
2380 return NewParm;
2381}
2382
2383/// Substitute the given template arguments into the given set of
2384/// parameters, producing the set of parameter types that would be generated
2385/// from such a substitution.
2386bool Sema::SubstParmTypes(
2387 SourceLocation Loc, ArrayRef<ParmVarDecl *> Params,
2388 const FunctionProtoType::ExtParameterInfo *ExtParamInfos,
2389 const MultiLevelTemplateArgumentList &TemplateArgs,
2390 SmallVectorImpl<QualType> &ParamTypes,
2391 SmallVectorImpl<ParmVarDecl *> *OutParams,
2392 ExtParameterInfoBuilder &ParamInfos) {
2393 assert(!CodeSynthesisContexts.empty() &&((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
"instantiation stack") ? static_cast<void> (0) : __assert_fail
("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2395, __PRETTY_FUNCTION__))
2394 "Cannot perform an instantiation without some context on the "((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
"instantiation stack") ? static_cast<void> (0) : __assert_fail
("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2395, __PRETTY_FUNCTION__))
2395 "instantiation stack")((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
"instantiation stack") ? static_cast<void> (0) : __assert_fail
("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2395, __PRETTY_FUNCTION__))
;
2396
2397 TemplateInstantiator Instantiator(*this, TemplateArgs, Loc,
2398 DeclarationName());
2399 return Instantiator.TransformFunctionTypeParams(
2400 Loc, Params, nullptr, ExtParamInfos, ParamTypes, OutParams, ParamInfos);
2401}
2402
2403/// Perform substitution on the base class specifiers of the
2404/// given class template specialization.
2405///
2406/// Produces a diagnostic and returns true on error, returns false and
2407/// attaches the instantiated base classes to the class template
2408/// specialization if successful.
2409bool
2410Sema::SubstBaseSpecifiers(CXXRecordDecl *Instantiation,
2411 CXXRecordDecl *Pattern,
2412 const MultiLevelTemplateArgumentList &TemplateArgs) {
2413 bool Invalid = false;
2414 SmallVector<CXXBaseSpecifier*, 4> InstantiatedBases;
2415 for (const auto &Base : Pattern->bases()) {
2416 if (!Base.getType()->isDependentType()) {
2417 if (const CXXRecordDecl *RD = Base.getType()->getAsCXXRecordDecl()) {
2418 if (RD->isInvalidDecl())
2419 Instantiation->setInvalidDecl();
2420 }
2421 InstantiatedBases.push_back(new (Context) CXXBaseSpecifier(Base));
2422 continue;
2423 }
2424
2425 SourceLocation EllipsisLoc;
2426 TypeSourceInfo *BaseTypeLoc;
2427 if (Base.isPackExpansion()) {
2428 // This is a pack expansion. See whether we should expand it now, or
2429 // wait until later.
2430 SmallVector<UnexpandedParameterPack, 2> Unexpanded;
2431 collectUnexpandedParameterPacks(Base.getTypeSourceInfo()->getTypeLoc(),
2432 Unexpanded);
2433 bool ShouldExpand = false;
2434 bool RetainExpansion = false;
2435 Optional<unsigned> NumExpansions;
2436 if (CheckParameterPacksForExpansion(Base.getEllipsisLoc(),
2437 Base.getSourceRange(),
2438 Unexpanded,
2439 TemplateArgs, ShouldExpand,
2440 RetainExpansion,
2441 NumExpansions)) {
2442 Invalid = true;
2443 continue;
2444 }
2445
2446 // If we should expand this pack expansion now, do so.
2447 if (ShouldExpand) {
2448 for (unsigned I = 0; I != *NumExpansions; ++I) {
2449 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(*this, I);
2450
2451 TypeSourceInfo *BaseTypeLoc = SubstType(Base.getTypeSourceInfo(),
2452 TemplateArgs,
2453 Base.getSourceRange().getBegin(),
2454 DeclarationName());
2455 if (!BaseTypeLoc) {
2456 Invalid = true;
2457 continue;
2458 }
2459
2460 if (CXXBaseSpecifier *InstantiatedBase
2461 = CheckBaseSpecifier(Instantiation,
2462 Base.getSourceRange(),
2463 Base.isVirtual(),
2464 Base.getAccessSpecifierAsWritten(),
2465 BaseTypeLoc,
2466 SourceLocation()))
2467 InstantiatedBases.push_back(InstantiatedBase);
2468 else
2469 Invalid = true;
2470 }
2471
2472 continue;
2473 }
2474
2475 // The resulting base specifier will (still) be a pack expansion.
2476 EllipsisLoc = Base.getEllipsisLoc();
2477 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(*this, -1);
2478 BaseTypeLoc = SubstType(Base.getTypeSourceInfo(),
2479 TemplateArgs,
2480 Base.getSourceRange().getBegin(),
2481 DeclarationName());
2482 } else {
2483 BaseTypeLoc = SubstType(Base.getTypeSourceInfo(),
2484 TemplateArgs,
2485 Base.getSourceRange().getBegin(),
2486 DeclarationName());
2487 }
2488
2489 if (!BaseTypeLoc) {
2490 Invalid = true;
2491 continue;
2492 }
2493
2494 if (CXXBaseSpecifier *InstantiatedBase
2495 = CheckBaseSpecifier(Instantiation,
2496 Base.getSourceRange(),
2497 Base.isVirtual(),
2498 Base.getAccessSpecifierAsWritten(),
2499 BaseTypeLoc,
2500 EllipsisLoc))
2501 InstantiatedBases.push_back(InstantiatedBase);
2502 else
2503 Invalid = true;
2504 }
2505
2506 if (!Invalid && AttachBaseSpecifiers(Instantiation, InstantiatedBases))
2507 Invalid = true;
2508
2509 return Invalid;
2510}
2511
2512// Defined via #include from SemaTemplateInstantiateDecl.cpp
2513namespace clang {
2514 namespace sema {
2515 Attr *instantiateTemplateAttribute(const Attr *At, ASTContext &C, Sema &S,
2516 const MultiLevelTemplateArgumentList &TemplateArgs);
2517 Attr *instantiateTemplateAttributeForDecl(
2518 const Attr *At, ASTContext &C, Sema &S,
2519 const MultiLevelTemplateArgumentList &TemplateArgs);
2520 }
2521}
2522
2523/// Instantiate the definition of a class from a given pattern.
2524///
2525/// \param PointOfInstantiation The point of instantiation within the
2526/// source code.
2527///
2528/// \param Instantiation is the declaration whose definition is being
2529/// instantiated. This will be either a class template specialization
2530/// or a member class of a class template specialization.
2531///
2532/// \param Pattern is the pattern from which the instantiation
2533/// occurs. This will be either the declaration of a class template or
2534/// the declaration of a member class of a class template.
2535///
2536/// \param TemplateArgs The template arguments to be substituted into
2537/// the pattern.
2538///
2539/// \param TSK the kind of implicit or explicit instantiation to perform.
2540///
2541/// \param Complain whether to complain if the class cannot be instantiated due
2542/// to the lack of a definition.
2543///
2544/// \returns true if an error occurred, false otherwise.
2545bool
2546Sema::InstantiateClass(SourceLocation PointOfInstantiation,
2547 CXXRecordDecl *Instantiation, CXXRecordDecl *Pattern,
2548 const MultiLevelTemplateArgumentList &TemplateArgs,
2549 TemplateSpecializationKind TSK,
2550 bool Complain) {
2551 CXXRecordDecl *PatternDef
2552 = cast_or_null<CXXRecordDecl>(Pattern->getDefinition());
27
Assuming the object is a 'CXXRecordDecl'
2553 if (DiagnoseUninstantiableTemplate(PointOfInstantiation, Instantiation,
28
Assuming the condition is false
29
Taking false branch
2554 Instantiation->getInstantiatedFromMemberClass(),
2555 Pattern, PatternDef, TSK, Complain))
2556 return true;
2557
2558 llvm::TimeTraceScope TimeScope("InstantiateClass", [&]() {
2559 std::string Name;
2560 llvm::raw_string_ostream OS(Name);
2561 Instantiation->getNameForDiagnostic(OS, getPrintingPolicy(),
2562 /*Qualified=*/true);
2563 return Name;
2564 });
2565
2566 Pattern = PatternDef;
2567
2568 // Record the point of instantiation.
2569 if (MemberSpecializationInfo *MSInfo
30
Assuming 'MSInfo' is null
31
Taking false branch
2570 = Instantiation->getMemberSpecializationInfo()) {
2571 MSInfo->setTemplateSpecializationKind(TSK);
2572 MSInfo->setPointOfInstantiation(PointOfInstantiation);
2573 } else if (ClassTemplateSpecializationDecl *Spec
32.1
'Spec' is null
32.1
'Spec' is null
33
Taking false branch
2574 = dyn_cast<ClassTemplateSpecializationDecl>(Instantiation)) {
32
Assuming 'Instantiation' is not a 'ClassTemplateSpecializationDecl'
2575 Spec->setTemplateSpecializationKind(TSK); 2576 Spec->setPointOfInstantiation(PointOfInstantiation); 2577 } 2578 2579 InstantiatingTemplate Inst(*this, PointOfInstantiation, Instantiation);
34
Calling constructor for 'InstantiatingTemplate'
48
Returning from constructor for 'InstantiatingTemplate'
2580 if (Inst.isInvalid())
49
Calling 'InstantiatingTemplate::isInvalid'
51
Returning from 'InstantiatingTemplate::isInvalid'
52
Taking false branch
2581 return true; 2582 assert(!Inst.isAlreadyInstantiating() && "should have been caught by caller")((!Inst.isAlreadyInstantiating() && "should have been caught by caller"
) ? static_cast<void> (0) : __assert_fail ("!Inst.isAlreadyInstantiating() && \"should have been caught by caller\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2582, __PRETTY_FUNCTION__))
;
53
'?' condition is true
2583 PrettyDeclStackTraceEntry CrashInfo(Context, Instantiation, SourceLocation(), 2584 "instantiating class definition"); 2585 2586 // Enter the scope of this instantiation. We don't use 2587 // PushDeclContext because we don't have a scope. 2588 ContextRAII SavedContext(*this, Instantiation); 2589 EnterExpressionEvaluationContext EvalContext( 2590 *this, Sema::ExpressionEvaluationContext::PotentiallyEvaluated); 2591 2592 // If this is an instantiation of a local class, merge this local 2593 // instantiation scope with the enclosing scope. Otherwise, every 2594 // instantiation of a class has its own local instantiation scope. 2595 bool MergeWithParentScope = !Instantiation->isDefinedOutsideFunctionOrMethod(); 2596 LocalInstantiationScope Scope(*this, MergeWithParentScope); 2597 2598 // Some class state isn't processed immediately but delayed till class 2599 // instantiation completes. We may not be ready to handle any delayed state 2600 // already on the stack as it might correspond to a different class, so save 2601 // it now and put it back later. 2602 SavePendingParsedClassStateRAII SavedPendingParsedClassState(*this); 2603 2604 // Pull attributes from the pattern onto the instantiation. 2605 InstantiateAttrs(TemplateArgs, Pattern, Instantiation); 2606 2607 // Start the definition of this instantiation. 2608 Instantiation->startDefinition(); 2609 2610 // The instantiation is visible here, even if it was first declared in an 2611 // unimported module. 2612 Instantiation->setVisibleDespiteOwningModule(); 2613 2614 // FIXME: This loses the as-written tag kind for an explicit instantiation. 2615 Instantiation->setTagKind(Pattern->getTagKind()); 2616 2617 // Do substitution on the base class specifiers. 2618 if (SubstBaseSpecifiers(Instantiation, Pattern, TemplateArgs))
54
Taking false branch
2619 Instantiation->setInvalidDecl(); 2620 2621 TemplateDeclInstantiator Instantiator(*this, Instantiation, TemplateArgs); 2622 SmallVector<Decl*, 4> Fields; 2623 // Delay instantiation of late parsed attributes. 2624 LateInstantiatedAttrVec LateAttrs; 2625 Instantiator.enableLateAttributeInstantiation(&LateAttrs); 2626 2627 bool MightHaveConstexprVirtualFunctions = false; 2628 for (auto *Member : Pattern->decls()) { 2629 // Don't instantiate members not belonging in this semantic context. 2630 // e.g. for: 2631 // @code 2632 // template <int i> class A { 2633 // class B *g; 2634 // }; 2635 // @endcode 2636 // 'class B' has the template as lexical context but semantically it is 2637 // introduced in namespace scope. 2638 if (Member->getDeclContext() != Pattern) 2639 continue; 2640 2641 // BlockDecls can appear in a default-member-initializer. They must be the 2642 // child of a BlockExpr, so we only know how to instantiate them from there. 2643 if (isa<BlockDecl>(Member)) 2644 continue; 2645 2646 if (Member->isInvalidDecl()) { 2647 Instantiation->setInvalidDecl(); 2648 continue; 2649 } 2650 2651 Decl *NewMember = Instantiator.Visit(Member); 2652 if (NewMember) { 2653 if (FieldDecl *Field = dyn_cast<FieldDecl>(NewMember)) { 2654 Fields.push_back(Field); 2655 } else if (EnumDecl *Enum = dyn_cast<EnumDecl>(NewMember)) { 2656 // C++11 [temp.inst]p1: The implicit instantiation of a class template 2657 // specialization causes the implicit instantiation of the definitions 2658 // of unscoped member enumerations. 2659 // Record a point of instantiation for this implicit instantiation. 2660 if (TSK == TSK_ImplicitInstantiation && !Enum->isScoped() && 2661 Enum->isCompleteDefinition()) { 2662 MemberSpecializationInfo *MSInfo =Enum->getMemberSpecializationInfo(); 2663 assert(MSInfo && "no spec info for member enum specialization")((MSInfo && "no spec info for member enum specialization"
) ? static_cast<void> (0) : __assert_fail ("MSInfo && \"no spec info for member enum specialization\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2663, __PRETTY_FUNCTION__))
; 2664 MSInfo->setTemplateSpecializationKind(TSK_ImplicitInstantiation); 2665 MSInfo->setPointOfInstantiation(PointOfInstantiation); 2666 } 2667 } else if (StaticAssertDecl *SA = dyn_cast<StaticAssertDecl>(NewMember)) { 2668 if (SA->isFailed()) { 2669 // A static_assert failed. Bail out; instantiating this 2670 // class is probably not meaningful. 2671 Instantiation->setInvalidDecl(); 2672 break; 2673 } 2674 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewMember)) { 2675 if (MD->isConstexpr() && !MD->getFriendObjectKind() && 2676 (MD->isVirtualAsWritten() || Instantiation->getNumBases())) 2677 MightHaveConstexprVirtualFunctions = true; 2678 } 2679 2680 if (NewMember->isInvalidDecl()) 2681 Instantiation->setInvalidDecl(); 2682 } else { 2683 // FIXME: Eventually, a NULL return will mean that one of the 2684 // instantiations was a semantic disaster, and we'll want to mark the 2685 // declaration invalid. 2686 // For now, we expect to skip some members that we can't yet handle. 2687 } 2688 } 2689 2690 // Finish checking fields. 2691 ActOnFields(nullptr, Instantiation->getLocation(), Instantiation, Fields, 2692 SourceLocation(), SourceLocation(), ParsedAttributesView()); 2693 CheckCompletedCXXClass(nullptr, Instantiation); 2694 2695 // Default arguments are parsed, if not instantiated. We can go instantiate 2696 // default arg exprs for default constructors if necessary now. Unless we're 2697 // parsing a class, in which case wait until that's finished. 2698 if (ParsingClassDepth == 0)
55
Assuming field 'ParsingClassDepth' is not equal to 0
56
Taking false branch
2699 ActOnFinishCXXNonNestedClass(); 2700 2701 // Instantiate late parsed attributes, and attach them to their decls. 2702 // See Sema::InstantiateAttrs 2703 for (LateInstantiatedAttrVec::iterator I = LateAttrs.begin(),
58
Loop condition is true. Entering loop body
2704 E = LateAttrs.end(); I != E; ++I) {
57
Assuming 'I' is not equal to 'E'
2705 assert(CurrentInstantiationScope == Instantiator.getStartingScope())((CurrentInstantiationScope == Instantiator.getStartingScope(
)) ? static_cast<void> (0) : __assert_fail ("CurrentInstantiationScope == Instantiator.getStartingScope()"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2705, __PRETTY_FUNCTION__))
;
59
Assuming the condition is true
60
'?' condition is true
2706 CurrentInstantiationScope = I->Scope; 2707 2708 // Allow 'this' within late-parsed attributes. 2709 NamedDecl *ND = dyn_cast<NamedDecl>(I->NewDecl);
61
Assuming field 'NewDecl' is not a 'NamedDecl'
62
'ND' initialized to a null pointer value
2710 CXXRecordDecl *ThisContext = 2711 dyn_cast_or_null<CXXRecordDecl>(ND->getDeclContext());
63
Called C++ object pointer is null
2712 CXXThisScopeRAII ThisScope(*this, ThisContext, Qualifiers(), 2713 ND && ND->isCXXInstanceMember()); 2714 2715 Attr *NewAttr = 2716 instantiateTemplateAttribute(I->TmplAttr, Context, *this, TemplateArgs); 2717 I->NewDecl->addAttr(NewAttr); 2718 LocalInstantiationScope::deleteScopes(I->Scope, 2719 Instantiator.getStartingScope()); 2720 } 2721 Instantiator.disableLateAttributeInstantiation(); 2722 LateAttrs.clear(); 2723 2724 ActOnFinishDelayedMemberInitializers(Instantiation); 2725 2726 // FIXME: We should do something similar for explicit instantiations so they 2727 // end up in the right module. 2728 if (TSK == TSK_ImplicitInstantiation) { 2729 Instantiation->setLocation(Pattern->getLocation()); 2730 Instantiation->setLocStart(Pattern->getInnerLocStart()); 2731 Instantiation->setBraceRange(Pattern->getBraceRange()); 2732 } 2733 2734 if (!Instantiation->isInvalidDecl()) { 2735 // Perform any dependent diagnostics from the pattern. 2736 PerformDependentDiagnostics(Pattern, TemplateArgs); 2737 2738 // Instantiate any out-of-line class template partial 2739 // specializations now. 2740 for (TemplateDeclInstantiator::delayed_partial_spec_iterator 2741 P = Instantiator.delayed_partial_spec_begin(), 2742 PEnd = Instantiator.delayed_partial_spec_end(); 2743 P != PEnd; ++P) { 2744 if (!Instantiator.InstantiateClassTemplatePartialSpecialization( 2745 P->first, P->second)) { 2746 Instantiation->setInvalidDecl(); 2747 break; 2748 } 2749 } 2750 2751 // Instantiate any out-of-line variable template partial 2752 // specializations now. 2753 for (TemplateDeclInstantiator::delayed_var_partial_spec_iterator 2754 P = Instantiator.delayed_var_partial_spec_begin(), 2755 PEnd = Instantiator.delayed_var_partial_spec_end(); 2756 P != PEnd; ++P) { 2757 if (!Instantiator.InstantiateVarTemplatePartialSpecialization( 2758 P->first, P->second)) { 2759 Instantiation->setInvalidDecl(); 2760 break; 2761 } 2762 } 2763 } 2764 2765 // Exit the scope of this instantiation. 2766 SavedContext.pop(); 2767 2768 if (!Instantiation->isInvalidDecl()) { 2769 Consumer.HandleTagDeclDefinition(Instantiation); 2770 2771 // Always emit the vtable for an explicit instantiation definition 2772 // of a polymorphic class template specialization. Otherwise, eagerly 2773 // instantiate only constexpr virtual functions in preparation for their use 2774 // in constant evaluation. 2775 if (TSK == TSK_ExplicitInstantiationDefinition) 2776 MarkVTableUsed(PointOfInstantiation, Instantiation, true); 2777 else if (MightHaveConstexprVirtualFunctions) 2778 MarkVirtualMembersReferenced(PointOfInstantiation, Instantiation, 2779 /*ConstexprOnly*/ true); 2780 } 2781 2782 return Instantiation->isInvalidDecl(); 2783} 2784 2785/// Instantiate the definition of an enum from a given pattern. 2786/// 2787/// \param PointOfInstantiation The point of instantiation within the 2788/// source code. 2789/// \param Instantiation is the declaration whose definition is being 2790/// instantiated. This will be a member enumeration of a class 2791/// temploid specialization, or a local enumeration within a 2792/// function temploid specialization. 2793/// \param Pattern The templated declaration from which the instantiation 2794/// occurs. 2795/// \param TemplateArgs The template arguments to be substituted into 2796/// the pattern. 2797/// \param TSK The kind of implicit or explicit instantiation to perform. 2798/// 2799/// \return \c true if an error occurred, \c false otherwise. 2800bool Sema::InstantiateEnum(SourceLocation PointOfInstantiation, 2801 EnumDecl *Instantiation, EnumDecl *Pattern, 2802 const MultiLevelTemplateArgumentList &TemplateArgs, 2803 TemplateSpecializationKind TSK) { 2804 EnumDecl *PatternDef = Pattern->getDefinition(); 2805 if (DiagnoseUninstantiableTemplate(PointOfInstantiation, Instantiation, 2806 Instantiation->getInstantiatedFromMemberEnum(), 2807 Pattern, PatternDef, TSK,/*Complain*/true)) 2808 return true; 2809 Pattern = PatternDef; 2810 2811 // Record the point of instantiation. 2812 if (MemberSpecializationInfo *MSInfo 2813 = Instantiation->getMemberSpecializationInfo()) { 2814 MSInfo->setTemplateSpecializationKind(TSK); 2815 MSInfo->setPointOfInstantiation(PointOfInstantiation); 2816 } 2817 2818 InstantiatingTemplate Inst(*this, PointOfInstantiation, Instantiation); 2819 if (Inst.isInvalid()) 2820 return true; 2821 if (Inst.isAlreadyInstantiating()) 2822 return false; 2823 PrettyDeclStackTraceEntry CrashInfo(Context, Instantiation, SourceLocation(), 2824 "instantiating enum definition"); 2825 2826 // The instantiation is visible here, even if it was first declared in an 2827 // unimported module. 2828 Instantiation->setVisibleDespiteOwningModule(); 2829 2830 // Enter the scope of this instantiation. We don't use 2831 // PushDeclContext because we don't have a scope. 2832 ContextRAII SavedContext(*this, Instantiation); 2833 EnterExpressionEvaluationContext EvalContext( 2834 *this, Sema::ExpressionEvaluationContext::PotentiallyEvaluated); 2835 2836 LocalInstantiationScope Scope(*this, /*MergeWithParentScope*/true); 2837 2838 // Pull attributes from the pattern onto the instantiation. 2839 InstantiateAttrs(TemplateArgs, Pattern, Instantiation); 2840 2841 TemplateDeclInstantiator Instantiator(*this, Instantiation, TemplateArgs); 2842 Instantiator.InstantiateEnumDefinition(Instantiation, Pattern); 2843 2844 // Exit the scope of this instantiation. 2845 SavedContext.pop(); 2846 2847 return Instantiation->isInvalidDecl(); 2848} 2849 2850 2851/// Instantiate the definition of a field from the given pattern. 2852/// 2853/// \param PointOfInstantiation The point of instantiation within the 2854/// source code. 2855/// \param Instantiation is the declaration whose definition is being 2856/// instantiated. This will be a class of a class temploid 2857/// specialization, or a local enumeration within a function temploid 2858/// specialization. 2859/// \param Pattern The templated declaration from which the instantiation 2860/// occurs. 2861/// \param TemplateArgs The template arguments to be substituted into 2862/// the pattern. 2863/// 2864/// \return \c true if an error occurred, \c false otherwise. 2865bool Sema::InstantiateInClassInitializer( 2866 SourceLocation PointOfInstantiation, FieldDecl *Instantiation, 2867 FieldDecl *Pattern, const MultiLevelTemplateArgumentList &TemplateArgs) { 2868 // If there is no initializer, we don't need to do anything. 2869 if (!Pattern->hasInClassInitializer()) 2870 return false; 2871 2872 assert(Instantiation->getInClassInitStyle() ==((Instantiation->getInClassInitStyle() == Pattern->getInClassInitStyle
() && "pattern and instantiation disagree about init style"
) ? static_cast<void> (0) : __assert_fail ("Instantiation->getInClassInitStyle() == Pattern->getInClassInitStyle() && \"pattern and instantiation disagree about init style\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2874, __PRETTY_FUNCTION__))
2873 Pattern->getInClassInitStyle() &&((Instantiation->getInClassInitStyle() == Pattern->getInClassInitStyle
() && "pattern and instantiation disagree about init style"
) ? static_cast<void> (0) : __assert_fail ("Instantiation->getInClassInitStyle() == Pattern->getInClassInitStyle() && \"pattern and instantiation disagree about init style\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2874, __PRETTY_FUNCTION__))
2874 "pattern and instantiation disagree about init style")((Instantiation->getInClassInitStyle() == Pattern->getInClassInitStyle
() && "pattern and instantiation disagree about init style"
) ? static_cast<void> (0) : __assert_fail ("Instantiation->getInClassInitStyle() == Pattern->getInClassInitStyle() && \"pattern and instantiation disagree about init style\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2874, __PRETTY_FUNCTION__))
; 2875 2876 // Error out if we haven't parsed the initializer of the pattern yet because 2877 // we are waiting for the closing brace of the outer class. 2878 Expr *OldInit = Pattern->getInClassInitializer(); 2879 if (!OldInit) { 2880 RecordDecl *PatternRD = Pattern->getParent(); 2881 RecordDecl *OutermostClass = PatternRD->getOuterLexicalRecordContext(); 2882 Diag(PointOfInstantiation, 2883 diag::err_in_class_initializer_not_yet_parsed) 2884 << OutermostClass << Pattern; 2885 Diag(Pattern->getEndLoc(), diag::note_in_class_initializer_not_yet_parsed); 2886 Instantiation->setInvalidDecl(); 2887 return true; 2888 } 2889 2890 InstantiatingTemplate Inst(*this, PointOfInstantiation, Instantiation); 2891 if (Inst.isInvalid()) 2892 return true; 2893 if (Inst.isAlreadyInstantiating()) { 2894 // Error out if we hit an instantiation cycle for this initializer. 2895 Diag(PointOfInstantiation, diag::err_in_class_initializer_cycle) 2896 << Instantiation; 2897 return true; 2898 } 2899 PrettyDeclStackTraceEntry CrashInfo(Context, Instantiation, SourceLocation(), 2900 "instantiating default member init"); 2901 2902 // Enter the scope of this instantiation. We don't use PushDeclContext because 2903 // we don't have a scope. 2904 ContextRAII SavedContext(*this, Instantiation->getParent()); 2905 EnterExpressionEvaluationContext EvalContext( 2906 *this, Sema::ExpressionEvaluationContext::PotentiallyEvaluated); 2907 2908 LocalInstantiationScope Scope(*this, true); 2909 2910 // Instantiate the initializer. 2911 ActOnStartCXXInClassMemberInitializer(); 2912 CXXThisScopeRAII ThisScope(*this, Instantiation->getParent(), Qualifiers()); 2913 2914 ExprResult NewInit = SubstInitializer(OldInit, TemplateArgs, 2915 /*CXXDirectInit=*/false); 2916 Expr *Init = NewInit.get(); 2917 assert((!Init || !isa<ParenListExpr>(Init)) && "call-style init in class")(((!Init || !isa<ParenListExpr>(Init)) && "call-style init in class"
) ? static_cast<void> (0) : __assert_fail ("(!Init || !isa<ParenListExpr>(Init)) && \"call-style init in class\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2917, __PRETTY_FUNCTION__))
; 2918 ActOnFinishCXXInClassMemberInitializer( 2919 Instantiation, Init ? Init->getBeginLoc() : SourceLocation(), Init); 2920 2921 if (auto *L = getASTMutationListener()) 2922 L->DefaultMemberInitializerInstantiated(Instantiation); 2923 2924 // Return true if the in-class initializer is still missing. 2925 return !Instantiation->getInClassInitializer(); 2926} 2927 2928namespace { 2929 /// A partial specialization whose template arguments have matched 2930 /// a given template-id. 2931 struct PartialSpecMatchResult { 2932 ClassTemplatePartialSpecializationDecl *Partial; 2933 TemplateArgumentList *Args; 2934 }; 2935} 2936 2937bool Sema::usesPartialOrExplicitSpecialization( 2938 SourceLocation Loc, ClassTemplateSpecializationDecl *ClassTemplateSpec) { 2939 if (ClassTemplateSpec->getTemplateSpecializationKind() == 2940 TSK_ExplicitSpecialization) 2941 return true; 2942 2943 SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs; 2944 ClassTemplateSpec->getSpecializedTemplate() 2945 ->getPartialSpecializations(PartialSpecs); 2946 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) { 2947 TemplateDeductionInfo Info(Loc); 2948 if (!DeduceTemplateArguments(PartialSpecs[I], 2949 ClassTemplateSpec->getTemplateArgs(), Info)) 2950 return true; 2951 } 2952 2953 return false; 2954} 2955 2956/// Get the instantiation pattern to use to instantiate the definition of a 2957/// given ClassTemplateSpecializationDecl (either the pattern of the primary 2958/// template or of a partial specialization). 2959static CXXRecordDecl * 2960getPatternForClassTemplateSpecialization( 2961 Sema &S, SourceLocation PointOfInstantiation, 2962 ClassTemplateSpecializationDecl *ClassTemplateSpec, 2963 TemplateSpecializationKind TSK, bool Complain) { 2964 Sema::InstantiatingTemplate Inst(S, PointOfInstantiation, ClassTemplateSpec); 2965 if (Inst.isInvalid() || Inst.isAlreadyInstantiating()) 2966 return nullptr; 2967 2968 llvm::PointerUnion<ClassTemplateDecl *, 2969 ClassTemplatePartialSpecializationDecl *> 2970 Specialized = ClassTemplateSpec->getSpecializedTemplateOrPartial(); 2971 if (!Specialized.is<ClassTemplatePartialSpecializationDecl *>()) { 2972 // Find best matching specialization. 2973 ClassTemplateDecl *Template = ClassTemplateSpec->getSpecializedTemplate(); 2974 2975 // C++ [temp.class.spec.match]p1: 2976 // When a class template is used in a context that requires an 2977 // instantiation of the class, it is necessary to determine 2978 // whether the instantiation is to be generated using the primary 2979 // template or one of the partial specializations. This is done by 2980 // matching the template arguments of the class template 2981 // specialization with the template argument lists of the partial 2982 // specializations. 2983 typedef PartialSpecMatchResult MatchResult; 2984 SmallVector<MatchResult, 4> Matched; 2985 SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs; 2986 Template->getPartialSpecializations(PartialSpecs); 2987 TemplateSpecCandidateSet FailedCandidates(PointOfInstantiation); 2988 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) { 2989 ClassTemplatePartialSpecializationDecl *Partial = PartialSpecs[I]; 2990 TemplateDeductionInfo Info(FailedCandidates.getLocation()); 2991 if (Sema::TemplateDeductionResult Result = S.DeduceTemplateArguments( 2992 Partial, ClassTemplateSpec->getTemplateArgs(), Info)) { 2993 // Store the failed-deduction information for use in diagnostics, later. 2994 // TODO: Actually use the failed-deduction info? 2995 FailedCandidates.addCandidate().set( 2996 DeclAccessPair::make(Template, AS_public), Partial, 2997 MakeDeductionFailureInfo(S.Context, Result, Info)); 2998 (void)Result; 2999 } else { 3000 Matched.push_back(PartialSpecMatchResult()); 3001 Matched.back().Partial = Partial; 3002 Matched.back().Args = Info.take(); 3003 } 3004 } 3005 3006 // If we're dealing with a member template where the template parameters 3007 // have been instantiated, this provides the original template parameters 3008 // from which the member template's parameters were instantiated. 3009 3010 if (Matched.size() >= 1) { 3011 SmallVectorImpl<MatchResult>::iterator Best = Matched.begin(); 3012 if (Matched.size() == 1) { 3013 // -- If exactly one matching specialization is found, the 3014 // instantiation is generated from that specialization. 3015 // We don't need to do anything for this. 3016 } else { 3017 // -- If more than one matching specialization is found, the 3018 // partial order rules (14.5.4.2) are used to determine 3019 // whether one of the specializations is more specialized 3020 // than the others. If none of the specializations is more 3021 // specialized than all of the other matching 3022 // specializations, then the use of the class template is 3023 // ambiguous and the program is ill-formed. 3024 for (SmallVectorImpl<MatchResult>::iterator P = Best + 1, 3025 PEnd = Matched.end(); 3026 P != PEnd; ++P) { 3027 if (S.getMoreSpecializedPartialSpecialization( 3028 P->Partial, Best->Partial, PointOfInstantiation) == 3029 P->Partial) 3030 Best = P; 3031 } 3032 3033 // Determine if the best partial specialization is more specialized than 3034 // the others. 3035 bool Ambiguous = false; 3036 for (SmallVectorImpl<MatchResult>::iterator P = Matched.begin(), 3037 PEnd = Matched.end(); 3038 P != PEnd; ++P) { 3039 if (P != Best && S.getMoreSpecializedPartialSpecialization( 3040 P->Partial, Best->Partial, 3041 PointOfInstantiation) != Best->Partial) { 3042 Ambiguous = true; 3043 break; 3044 } 3045 } 3046 3047 if (Ambiguous) { 3048 // Partial ordering did not produce a clear winner. Complain. 3049 Inst.Clear(); 3050 ClassTemplateSpec->setInvalidDecl(); 3051 S.Diag(PointOfInstantiation, 3052 diag::err_partial_spec_ordering_ambiguous) 3053 << ClassTemplateSpec; 3054 3055 // Print the matching partial specializations. 3056 for (SmallVectorImpl<MatchResult>::iterator P = Matched.begin(), 3057 PEnd = Matched.end(); 3058 P != PEnd; ++P) 3059 S.Diag(P->Partial->getLocation(), diag::note_partial_spec_match) 3060 << S.getTemplateArgumentBindingsText( 3061 P->Partial->getTemplateParameters(), *P->Args); 3062 3063 return nullptr; 3064 } 3065 } 3066 3067 ClassTemplateSpec->setInstantiationOf(Best->Partial, Best->Args); 3068 } else { 3069 // -- If no matches are found, the instantiation is generated 3070 // from the primary template. 3071 } 3072 } 3073 3074 CXXRecordDecl *Pattern = nullptr; 3075 Specialized = ClassTemplateSpec->getSpecializedTemplateOrPartial(); 3076 if (auto *PartialSpec = 3077 Specialized.dyn_cast<ClassTemplatePartialSpecializationDecl *>()) { 3078 // Instantiate using the best class template partial specialization. 3079 while (PartialSpec->getInstantiatedFromMember()) { 3080 // If we've found an explicit specialization of this class template, 3081 // stop here and use that as the pattern. 3082 if (PartialSpec->isMemberSpecialization()) 3083 break; 3084 3085 PartialSpec = PartialSpec->getInstantiatedFromMember(); 3086 } 3087 Pattern = PartialSpec; 3088 } else { 3089 ClassTemplateDecl *Template = ClassTemplateSpec->getSpecializedTemplate(); 3090 while (Template->getInstantiatedFromMemberTemplate()) { 3091 // If we've found an explicit specialization of this class template, 3092 // stop here and use that as the pattern. 3093 if (Template->isMemberSpecialization()) 3094 break; 3095 3096 Template = Template->getInstantiatedFromMemberTemplate(); 3097 } 3098 Pattern = Template->getTemplatedDecl(); 3099 } 3100 3101 return Pattern; 3102} 3103 3104bool Sema::InstantiateClassTemplateSpecialization( 3105 SourceLocation PointOfInstantiation, 3106 ClassTemplateSpecializationDecl *ClassTemplateSpec, 3107 TemplateSpecializationKind TSK, bool Complain) { 3108 // Perform the actual instantiation on the canonical declaration. 3109 ClassTemplateSpec = cast<ClassTemplateSpecializationDecl>( 3110 ClassTemplateSpec->getCanonicalDecl()); 3111 if (ClassTemplateSpec->isInvalidDecl()) 3112 return true; 3113 3114 CXXRecordDecl *Pattern = getPatternForClassTemplateSpecialization( 3115 *this, PointOfInstantiation, ClassTemplateSpec, TSK, Complain); 3116 if (!Pattern) 3117 return true; 3118 3119 return InstantiateClass(PointOfInstantiation, ClassTemplateSpec, Pattern, 3120 getTemplateInstantiationArgs(ClassTemplateSpec), TSK, 3121 Complain); 3122} 3123 3124/// Instantiates the definitions of all of the member 3125/// of the given class, which is an instantiation of a class template 3126/// or a member class of a template. 3127void 3128Sema::InstantiateClassMembers(SourceLocation PointOfInstantiation, 3129 CXXRecordDecl *Instantiation, 3130 const MultiLevelTemplateArgumentList &TemplateArgs, 3131 TemplateSpecializationKind TSK) { 3132 // FIXME: We need to notify the ASTMutationListener that we did all of these 3133 // things, in case we have an explicit instantiation definition in a PCM, a 3134 // module, or preamble, and the declaration is in an imported AST. 3135 assert((((TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration
|| (TSK == TSK_ImplicitInstantiation && Instantiation
->isLocalClass())) && "Unexpected template specialization kind!"
) ? static_cast<void> (0) : __assert_fail ("(TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration || (TSK == TSK_ImplicitInstantiation && Instantiation->isLocalClass())) && \"Unexpected template specialization kind!\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3139, __PRETTY_FUNCTION__))
1
Assuming 'TSK' is not equal to TSK_ExplicitInstantiationDefinition
2
Assuming 'TSK' is not equal to TSK_ExplicitInstantiationDeclaration
3
Assuming 'TSK' is equal to TSK_ImplicitInstantiation
4
'?' condition is true
3136 (TSK == TSK_ExplicitInstantiationDefinition ||(((TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration
|| (TSK == TSK_ImplicitInstantiation && Instantiation
->isLocalClass())) && "Unexpected template specialization kind!"
) ? static_cast<void> (0) : __assert_fail ("(TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration || (TSK == TSK_ImplicitInstantiation && Instantiation->isLocalClass())) && \"Unexpected template specialization kind!\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3139, __PRETTY_FUNCTION__))
3137 TSK == TSK_ExplicitInstantiationDeclaration ||(((TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration
|| (TSK == TSK_ImplicitInstantiation && Instantiation
->isLocalClass())) && "Unexpected template specialization kind!"
) ? static_cast<void> (0) : __assert_fail ("(TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration || (TSK == TSK_ImplicitInstantiation && Instantiation->isLocalClass())) && \"Unexpected template specialization kind!\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3139, __PRETTY_FUNCTION__))
3138 (TSK == TSK_ImplicitInstantiation && Instantiation->isLocalClass())) &&(((TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration
|| (TSK == TSK_ImplicitInstantiation && Instantiation
->isLocalClass())) && "Unexpected template specialization kind!"
) ? static_cast<void> (0) : __assert_fail ("(TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration || (TSK == TSK_ImplicitInstantiation && Instantiation->isLocalClass())) && \"Unexpected template specialization kind!\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3139, __PRETTY_FUNCTION__))
3139 "Unexpected template specialization kind!")(((TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration
|| (TSK == TSK_ImplicitInstantiation && Instantiation
->isLocalClass())) && "Unexpected template specialization kind!"
) ? static_cast<void> (0) : __assert_fail ("(TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration || (TSK == TSK_ImplicitInstantiation && Instantiation->isLocalClass())) && \"Unexpected template specialization kind!\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3139, __PRETTY_FUNCTION__))
; 3140 for (auto *D : Instantiation->decls()) { 3141 bool SuppressNew = false; 3142 if (auto *Function
5.1
'Function' is null
5.1
'Function' is null
= dyn_cast<FunctionDecl>(D)) {
5
Assuming 'D' is not a 'FunctionDecl'
6
Taking false branch
3143 if (FunctionDecl *Pattern = 3144 Function->getInstantiatedFromMemberFunction()) { 3145 3146 if (Function->hasAttr<ExcludeFromExplicitInstantiationAttr>()) 3147 continue; 3148 3149 MemberSpecializationInfo *MSInfo = 3150 Function->getMemberSpecializationInfo(); 3151 assert(MSInfo && "No member specialization information?")((MSInfo && "No member specialization information?") ?
static_cast<void> (0) : __assert_fail ("MSInfo && \"No member specialization information?\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3151, __PRETTY_FUNCTION__))
; 3152 if (MSInfo->getTemplateSpecializationKind() 3153 == TSK_ExplicitSpecialization) 3154 continue; 3155 3156 if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK, 3157 Function, 3158 MSInfo->getTemplateSpecializationKind(), 3159 MSInfo->getPointOfInstantiation(), 3160 SuppressNew) || 3161 SuppressNew) 3162 continue; 3163 3164 // C++11 [temp.explicit]p8: 3165 // An explicit instantiation definition that names a class template 3166 // specialization explicitly instantiates the class template 3167 // specialization and is only an explicit instantiation definition 3168 // of members whose definition is visible at the point of 3169 // instantiation. 3170 if (TSK == TSK_ExplicitInstantiationDefinition && !Pattern->isDefined()) 3171 continue; 3172 3173 Function->setTemplateSpecializationKind(TSK, PointOfInstantiation); 3174 3175 if (Function->isDefined()) { 3176 // Let the ASTConsumer know that this function has been explicitly 3177 // instantiated now, and its linkage might have changed. 3178 Consumer.HandleTopLevelDecl(DeclGroupRef(Function)); 3179 } else if (TSK == TSK_ExplicitInstantiationDefinition) { 3180 InstantiateFunctionDefinition(PointOfInstantiation, Function); 3181 } else if (TSK == TSK_ImplicitInstantiation) { 3182 PendingLocalImplicitInstantiations.push_back( 3183 std::make_pair(Function, PointOfInstantiation)); 3184 } 3185 } 3186 } else if (auto *Var
7.1
'Var' is null
7.1
'Var' is null
= dyn_cast<VarDecl>(D)) {
7
Assuming 'D' is not a 'VarDecl'
8
Taking false branch
3187 if (isa<VarTemplateSpecializationDecl>(Var)) 3188 continue; 3189 3190 if (Var->isStaticDataMember()) { 3191 if (Var->hasAttr<ExcludeFromExplicitInstantiationAttr>()) 3192 continue; 3193 3194 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 3195 assert(MSInfo && "No member specialization information?")((MSInfo && "No member specialization information?") ?
static_cast<void> (0) : __assert_fail ("MSInfo && \"No member specialization information?\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3195, __PRETTY_FUNCTION__))
; 3196 if (MSInfo->getTemplateSpecializationKind() 3197 == TSK_ExplicitSpecialization) 3198 continue; 3199 3200 if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK, 3201 Var, 3202 MSInfo->getTemplateSpecializationKind(), 3203 MSInfo->getPointOfInstantiation(), 3204 SuppressNew) || 3205 SuppressNew) 3206 continue; 3207 3208 if (TSK == TSK_ExplicitInstantiationDefinition) { 3209 // C++0x [temp.explicit]p8: 3210 // An explicit instantiation definition that names a class template 3211 // specialization explicitly instantiates the class template 3212 // specialization and is only an explicit instantiation definition 3213 // of members whose definition is visible at the point of 3214 // instantiation. 3215 if (!Var->getInstantiatedFromStaticDataMember()->getDefinition()) 3216 continue; 3217 3218 Var->setTemplateSpecializationKind(TSK, PointOfInstantiation); 3219 InstantiateVariableDefinition(PointOfInstantiation, Var); 3220 } else { 3221 Var->setTemplateSpecializationKind(TSK, PointOfInstantiation); 3222 } 3223 } 3224 } else if (auto *Record
9.1
'Record' is non-null
9.1
'Record' is non-null
= dyn_cast<CXXRecordDecl>(D)) {
9
Assuming 'D' is a 'CXXRecordDecl'
10
Taking true branch
3225 if (Record->hasAttr<ExcludeFromExplicitInstantiationAttr>())
11
Taking false branch
3226 continue; 3227 3228 // Always skip the injected-class-name, along with any 3229 // redeclarations of nested classes, since both would cause us 3230 // to try to instantiate the members of a class twice. 3231 // Skip closure types; they'll get instantiated when we instantiate 3232 // the corresponding lambda-expression. 3233 if (Record->isInjectedClassName() || Record->getPreviousDecl() ||
12
Assuming the condition is false
13
Taking false branch
3234 Record->isLambda()) 3235 continue; 3236 3237 MemberSpecializationInfo *MSInfo = Record->getMemberSpecializationInfo(); 3238 assert(MSInfo && "No member specialization information?")((MSInfo && "No member specialization information?") ?
static_cast<void> (0) : __assert_fail ("MSInfo && \"No member specialization information?\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3238, __PRETTY_FUNCTION__))
;
14
Assuming 'MSInfo' is non-null
15
'?' condition is true
3239 3240 if (MSInfo->getTemplateSpecializationKind()
16
Assuming the condition is false
17
Taking false branch
3241 == TSK_ExplicitSpecialization) 3242 continue; 3243 3244 if (Context.getTargetInfo().getTriple().isOSWindows() && 3245 TSK == TSK_ExplicitInstantiationDeclaration) { 3246 // On Windows, explicit instantiation decl of the outer class doesn't 3247 // affect the inner class. Typically extern template declarations are 3248 // used in combination with dll import/export annotations, but those 3249 // are not propagated from the outer class templates to inner classes. 3250 // Therefore, do not instantiate inner classes on this platform, so 3251 // that users don't end up with undefined symbols during linking. 3252 continue; 3253 } 3254 3255 if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK,
18
Assuming the condition is false
19
Assuming the condition is false
20
Taking false branch
3256 Record, 3257 MSInfo->getTemplateSpecializationKind(), 3258 MSInfo->getPointOfInstantiation(), 3259 SuppressNew) || 3260 SuppressNew) 3261 continue; 3262 3263 CXXRecordDecl *Pattern = Record->getInstantiatedFromMemberClass(); 3264 assert(Pattern && "Missing instantiated-from-template information")((Pattern && "Missing instantiated-from-template information"
) ? static_cast<void> (0) : __assert_fail ("Pattern && \"Missing instantiated-from-template information\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3264, __PRETTY_FUNCTION__))
;
21
Assuming 'Pattern' is non-null
22
'?' condition is true
3265 3266 if (!Record->getDefinition()) {
23
Taking true branch
3267 if (!Pattern->getDefinition()) {
24
Assuming the condition is false
25
Taking false branch
3268 // C++0x [temp.explicit]p8: 3269 // An explicit instantiation definition that names a class template 3270 // specialization explicitly instantiates the class template 3271 // specialization and is only an explicit instantiation definition 3272 // of members whose definition is visible at the point of 3273 // instantiation. 3274 if (TSK == TSK_ExplicitInstantiationDeclaration) { 3275 MSInfo->setTemplateSpecializationKind(TSK); 3276 MSInfo->setPointOfInstantiation(PointOfInstantiation); 3277 } 3278 3279 continue; 3280 } 3281 3282 InstantiateClass(PointOfInstantiation, Record, Pattern,
26
Calling 'Sema::InstantiateClass'
3283 TemplateArgs, 3284 TSK); 3285 } else { 3286 if (TSK == TSK_ExplicitInstantiationDefinition && 3287 Record->getTemplateSpecializationKind() == 3288 TSK_ExplicitInstantiationDeclaration) { 3289 Record->setTemplateSpecializationKind(TSK); 3290 MarkVTableUsed(PointOfInstantiation, Record, true); 3291 } 3292 } 3293 3294 Pattern = cast_or_null<CXXRecordDecl>(Record->getDefinition()); 3295 if (Pattern) 3296 InstantiateClassMembers(PointOfInstantiation, Pattern, TemplateArgs, 3297 TSK); 3298 } else if (auto *Enum = dyn_cast<EnumDecl>(D)) { 3299 MemberSpecializationInfo *MSInfo = Enum->getMemberSpecializationInfo(); 3300 assert(MSInfo && "No member specialization information?")((MSInfo && "No member specialization information?") ?
static_cast<void> (0) : __assert_fail ("MSInfo && \"No member specialization information?\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3300, __PRETTY_FUNCTION__))
; 3301 3302 if (MSInfo->getTemplateSpecializationKind() 3303 == TSK_ExplicitSpecialization) 3304 continue; 3305 3306 if (CheckSpecializationInstantiationRedecl( 3307 PointOfInstantiation, TSK, Enum, 3308 MSInfo->getTemplateSpecializationKind(), 3309 MSInfo->getPointOfInstantiation(), SuppressNew) || 3310 SuppressNew) 3311 continue; 3312 3313 if (Enum->getDefinition()) 3314 continue; 3315 3316 EnumDecl *Pattern = Enum->getTemplateInstantiationPattern(); 3317 assert(Pattern && "Missing instantiated-from-template information")((Pattern && "Missing instantiated-from-template information"
) ? static_cast<void> (0) : __assert_fail ("Pattern && \"Missing instantiated-from-template information\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3317, __PRETTY_FUNCTION__))
; 3318 3319 if (TSK == TSK_ExplicitInstantiationDefinition) { 3320 if (!Pattern->getDefinition()) 3321 continue; 3322 3323 InstantiateEnum(PointOfInstantiation, Enum, Pattern, TemplateArgs, TSK); 3324 } else { 3325 MSInfo->setTemplateSpecializationKind(TSK); 3326 MSInfo->setPointOfInstantiation(PointOfInstantiation); 3327 } 3328 } else if (auto *Field = dyn_cast<FieldDecl>(D)) { 3329 // No need to instantiate in-class initializers during explicit 3330 // instantiation. 3331 if (Field->hasInClassInitializer() && TSK == TSK_ImplicitInstantiation) { 3332 CXXRecordDecl *ClassPattern = 3333 Instantiation->getTemplateInstantiationPattern(); 3334 DeclContext::lookup_result Lookup = 3335 ClassPattern->lookup(Field->getDeclName()); 3336 FieldDecl *Pattern = cast<FieldDecl>(Lookup.front()); 3337 InstantiateInClassInitializer(PointOfInstantiation, Field, Pattern, 3338 TemplateArgs); 3339 } 3340 } 3341 } 3342} 3343 3344/// Instantiate the definitions of all of the members of the 3345/// given class template specialization, which was named as part of an 3346/// explicit instantiation. 3347void 3348Sema::InstantiateClassTemplateSpecializationMembers( 3349 SourceLocation PointOfInstantiation, 3350 ClassTemplateSpecializationDecl *ClassTemplateSpec, 3351 TemplateSpecializationKind TSK) { 3352 // C++0x [temp.explicit]p7: 3353 // An explicit instantiation that names a class template 3354 // specialization is an explicit instantion of the same kind 3355 // (declaration or definition) of each of its members (not 3356 // including members inherited from base classes) that has not 3357 // been previously explicitly specialized in the translation unit 3358 // containing the explicit instantiation, except as described 3359 // below. 3360 InstantiateClassMembers(PointOfInstantiation, ClassTemplateSpec, 3361 getTemplateInstantiationArgs(ClassTemplateSpec), 3362 TSK); 3363} 3364 3365StmtResult 3366Sema::SubstStmt(Stmt *S, const MultiLevelTemplateArgumentList &TemplateArgs) { 3367 if (!S) 3368 return S; 3369 3370 TemplateInstantiator Instantiator(*this, TemplateArgs, 3371 SourceLocation(), 3372 DeclarationName()); 3373 return Instantiator.TransformStmt(S); 3374} 3375 3376bool Sema::SubstTemplateArguments( 3377 ArrayRef<TemplateArgumentLoc> Args, 3378 const MultiLevelTemplateArgumentList &TemplateArgs, 3379 TemplateArgumentListInfo &Out) { 3380 TemplateInstantiator Instantiator(*this, TemplateArgs, 3381 SourceLocation(), 3382 DeclarationName()); 3383 return Instantiator.TransformTemplateArguments(Args.begin(), Args.end(), 3384 Out); 3385} 3386 3387ExprResult 3388Sema::SubstExpr(Expr *E, const MultiLevelTemplateArgumentList &TemplateArgs) { 3389 if (!E) 3390 return E; 3391 3392 TemplateInstantiator Instantiator(*this, TemplateArgs, 3393 SourceLocation(), 3394 DeclarationName()); 3395 return Instantiator.TransformExpr(E); 3396} 3397 3398ExprResult Sema::SubstInitializer(Expr *Init, 3399 const MultiLevelTemplateArgumentList &TemplateArgs, 3400 bool CXXDirectInit) { 3401 TemplateInstantiator Instantiator(*this, TemplateArgs, 3402 SourceLocation(), 3403 DeclarationName()); 3404 return Instantiator.TransformInitializer(Init, CXXDirectInit); 3405} 3406 3407bool Sema::SubstExprs(ArrayRef<Expr *> Exprs, bool IsCall, 3408 const MultiLevelTemplateArgumentList &TemplateArgs, 3409 SmallVectorImpl<Expr *> &Outputs) { 3410 if (Exprs.empty()) 3411 return false; 3412 3413 TemplateInstantiator Instantiator(*this, TemplateArgs, 3414 SourceLocation(), 3415 DeclarationName()); 3416 return Instantiator.TransformExprs(Exprs.data(), Exprs.size(), 3417 IsCall, Outputs); 3418} 3419 3420NestedNameSpecifierLoc 3421Sema::SubstNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS, 3422 const MultiLevelTemplateArgumentList &TemplateArgs) { 3423 if (!NNS) 3424 return NestedNameSpecifierLoc(); 3425 3426 TemplateInstantiator Instantiator(*this, TemplateArgs, NNS.getBeginLoc(), 3427 DeclarationName()); 3428 return Instantiator.TransformNestedNameSpecifierLoc(NNS); 3429} 3430 3431/// Do template substitution on declaration name info. 3432DeclarationNameInfo 3433Sema::SubstDeclarationNameInfo(const DeclarationNameInfo &NameInfo, 3434 const MultiLevelTemplateArgumentList &TemplateArgs) { 3435 TemplateInstantiator Instantiator(*this, TemplateArgs, NameInfo.getLoc(), 3436 NameInfo.getName()); 3437 return Instantiator.TransformDeclarationNameInfo(NameInfo); 3438} 3439 3440TemplateName 3441Sema::SubstTemplateName(NestedNameSpecifierLoc QualifierLoc, 3442 TemplateName Name, SourceLocation Loc, 3443 const MultiLevelTemplateArgumentList &TemplateArgs) { 3444 TemplateInstantiator Instantiator(*this, TemplateArgs, Loc, 3445 DeclarationName()); 3446 CXXScopeSpec SS; 3447 SS.Adopt(QualifierLoc); 3448 return Instantiator.TransformTemplateName(SS, Name, Loc); 3449} 3450 3451bool Sema::Subst(const TemplateArgumentLoc *Args, unsigned NumArgs, 3452 TemplateArgumentListInfo &Result, 3453 const MultiLevelTemplateArgumentList &TemplateArgs) { 3454 TemplateInstantiator Instantiator(*this, TemplateArgs, SourceLocation(), 3455 DeclarationName()); 3456 3457 return Instantiator.TransformTemplateArguments(Args, NumArgs, Result); 3458} 3459 3460static const Decl *getCanonicalParmVarDecl(const Decl *D) { 3461 // When storing ParmVarDecls in the local instantiation scope, we always 3462 // want to use the ParmVarDecl from the canonical function declaration, 3463 // since the map is then valid for any redeclaration or definition of that 3464 // function. 3465 if (const ParmVarDecl *PV = dyn_cast<ParmVarDecl>(D)) { 3466 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(PV->getDeclContext())) { 3467 unsigned i = PV->getFunctionScopeIndex(); 3468 // This parameter might be from a freestanding function type within the 3469 // function and isn't necessarily referring to one of FD's parameters. 3470 if (i < FD->getNumParams() && FD->getParamDecl(i) == PV) 3471 return FD->getCanonicalDecl()->getParamDecl(i); 3472 } 3473 } 3474 return D; 3475} 3476 3477 3478llvm::PointerUnion<Decl *, LocalInstantiationScope::DeclArgumentPack *> * 3479LocalInstantiationScope::findInstantiationOf(const Decl *D) { 3480 D = getCanonicalParmVarDecl(D); 3481 for (LocalInstantiationScope *Current = this; Current; 3482 Current = Current->Outer) { 3483 3484 // Check if we found something within this scope. 3485 const Decl *CheckD = D; 3486 do { 3487 LocalDeclsMap::iterator Found = Current->LocalDecls.find(CheckD); 3488 if (Found != Current->LocalDecls.end()) 3489 return &Found->second; 3490 3491 // If this is a tag declaration, it's possible that we need to look for 3492 // a previous declaration. 3493 if (const TagDecl *Tag = dyn_cast<TagDecl>(CheckD)) 3494 CheckD = Tag->getPreviousDecl(); 3495 else 3496 CheckD = nullptr; 3497 } while (CheckD); 3498 3499 // If we aren't combined with our outer scope, we're done. 3500 if (!Current->CombineWithOuterScope) 3501 break; 3502 } 3503 3504 // If we're performing a partial substitution during template argument 3505 // deduction, we may not have values for template parameters yet. 3506 if (isa<NonTypeTemplateParmDecl>(D) || isa<TemplateTypeParmDecl>(D) || 3507 isa<TemplateTemplateParmDecl>(D)) 3508 return nullptr; 3509 3510 // Local types referenced prior to definition may require instantiation. 3511 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D)) 3512 if (RD->isLocalClass()) 3513 return nullptr; 3514 3515 // Enumeration types referenced prior to definition may appear as a result of 3516 // error recovery. 3517 if (isa<EnumDecl>(D)) 3518 return nullptr; 3519 3520 // If we didn't find the decl, then we either have a sema bug, or we have a 3521 // forward reference to a label declaration. Return null to indicate that 3522 // we have an uninstantiated label. 3523 assert(isa<LabelDecl>(D) && "declaration not instantiated in this scope")((isa<LabelDecl>(D) && "declaration not instantiated in this scope"
) ? static_cast<void> (0) : __assert_fail ("isa<LabelDecl>(D) && \"declaration not instantiated in this scope\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3523, __PRETTY_FUNCTION__))
; 3524 return nullptr; 3525} 3526 3527void LocalInstantiationScope::InstantiatedLocal(const Decl *D, Decl *Inst) { 3528 D = getCanonicalParmVarDecl(D); 3529 llvm::PointerUnion<Decl *, DeclArgumentPack *> &Stored = LocalDecls[D]; 3530 if (Stored.isNull()) { 3531#ifndef NDEBUG 3532 // It should not be present in any surrounding scope either. 3533 LocalInstantiationScope *Current = this; 3534 while (Current->CombineWithOuterScope && Current->Outer) { 3535 Current = Current->Outer; 3536 assert(Current->LocalDecls.find(D) == Current->LocalDecls.end() &&((Current->LocalDecls.find(D) == Current->LocalDecls.end
() && "Instantiated local in inner and outer scopes")
? static_cast<void> (0) : __assert_fail ("Current->LocalDecls.find(D) == Current->LocalDecls.end() && \"Instantiated local in inner and outer scopes\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3537, __PRETTY_FUNCTION__))
3537 "Instantiated local in inner and outer scopes")((Current->LocalDecls.find(D) == Current->LocalDecls.end
() && "Instantiated local in inner and outer scopes")
? static_cast<void> (0) : __assert_fail ("Current->LocalDecls.find(D) == Current->LocalDecls.end() && \"Instantiated local in inner and outer scopes\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3537, __PRETTY_FUNCTION__))
; 3538 } 3539#endif 3540 Stored = Inst; 3541 } else if (DeclArgumentPack *Pack = Stored.dyn_cast<DeclArgumentPack *>()) { 3542 Pack->push_back(cast<VarDecl>(Inst)); 3543 } else { 3544 assert(Stored.get<Decl *>() == Inst && "Already instantiated this local")((Stored.get<Decl *>() == Inst && "Already instantiated this local"
) ? static_cast<void> (0) : __assert_fail ("Stored.get<Decl *>() == Inst && \"Already instantiated this local\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3544, __PRETTY_FUNCTION__))
; 3545 } 3546} 3547 3548void LocalInstantiationScope::InstantiatedLocalPackArg(const Decl *D, 3549 VarDecl *Inst) { 3550 D = getCanonicalParmVarDecl(D); 3551 DeclArgumentPack *Pack = LocalDecls[D].get<DeclArgumentPack *>(); 3552 Pack->push_back(Inst); 3553} 3554 3555void LocalInstantiationScope::MakeInstantiatedLocalArgPack(const Decl *D) { 3556#ifndef NDEBUG 3557 // This should be the first time we've been told about this decl. 3558 for (LocalInstantiationScope *Current = this; 3559 Current && Current->CombineWithOuterScope; Current = Current->Outer) 3560 assert(Current->LocalDecls.find(D) == Current->LocalDecls.end() &&((Current->LocalDecls.find(D) == Current->LocalDecls.end
() && "Creating local pack after instantiation of local"
) ? static_cast<void> (0) : __assert_fail ("Current->LocalDecls.find(D) == Current->LocalDecls.end() && \"Creating local pack after instantiation of local\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3561, __PRETTY_FUNCTION__))
3561 "Creating local pack after instantiation of local")((Current->LocalDecls.find(D) == Current->LocalDecls.end
() && "Creating local pack after instantiation of local"
) ? static_cast<void> (0) : __assert_fail ("Current->LocalDecls.find(D) == Current->LocalDecls.end() && \"Creating local pack after instantiation of local\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3561, __PRETTY_FUNCTION__))
; 3562#endif 3563 3564 D = getCanonicalParmVarDecl(D); 3565 llvm::PointerUnion<Decl *, DeclArgumentPack *> &Stored = LocalDecls[D]; 3566 DeclArgumentPack *Pack = new DeclArgumentPack; 3567 Stored = Pack; 3568 ArgumentPacks.push_back(Pack); 3569} 3570 3571void LocalInstantiationScope::SetPartiallySubstitutedPack(NamedDecl *Pack, 3572 const TemplateArgument *ExplicitArgs, 3573 unsigned NumExplicitArgs) { 3574 assert((!PartiallySubstitutedPack || PartiallySubstitutedPack == Pack) &&(((!PartiallySubstitutedPack || PartiallySubstitutedPack == Pack
) && "Already have a partially-substituted pack") ? static_cast
<void> (0) : __assert_fail ("(!PartiallySubstitutedPack || PartiallySubstitutedPack == Pack) && \"Already have a partially-substituted pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3575, __PRETTY_FUNCTION__))
3575 "Already have a partially-substituted pack")(((!PartiallySubstitutedPack || PartiallySubstitutedPack == Pack
) && "Already have a partially-substituted pack") ? static_cast
<void> (0) : __assert_fail ("(!PartiallySubstitutedPack || PartiallySubstitutedPack == Pack) && \"Already have a partially-substituted pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3575, __PRETTY_FUNCTION__))
; 3576 assert((!PartiallySubstitutedPack(((!PartiallySubstitutedPack || NumArgsInPartiallySubstitutedPack
== NumExplicitArgs) && "Wrong number of arguments in partially-substituted pack"
) ? static_cast<void> (0) : __assert_fail ("(!PartiallySubstitutedPack || NumArgsInPartiallySubstitutedPack == NumExplicitArgs) && \"Wrong number of arguments in partially-substituted pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3578, __PRETTY_FUNCTION__))
3577 || NumArgsInPartiallySubstitutedPack == NumExplicitArgs) &&(((!PartiallySubstitutedPack || NumArgsInPartiallySubstitutedPack
== NumExplicitArgs) && "Wrong number of arguments in partially-substituted pack"
) ? static_cast<void> (0) : __assert_fail ("(!PartiallySubstitutedPack || NumArgsInPartiallySubstitutedPack == NumExplicitArgs) && \"Wrong number of arguments in partially-substituted pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3578, __PRETTY_FUNCTION__))
3578 "Wrong number of arguments in partially-substituted pack")(((!PartiallySubstitutedPack || NumArgsInPartiallySubstitutedPack
== NumExplicitArgs) && "Wrong number of arguments in partially-substituted pack"
) ? static_cast<void> (0) : __assert_fail ("(!PartiallySubstitutedPack || NumArgsInPartiallySubstitutedPack == NumExplicitArgs) && \"Wrong number of arguments in partially-substituted pack\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3578, __PRETTY_FUNCTION__))
; 3579 PartiallySubstitutedPack = Pack; 3580 ArgsInPartiallySubstitutedPack = ExplicitArgs; 3581 NumArgsInPartiallySubstitutedPack = NumExplicitArgs; 3582} 3583 3584NamedDecl *LocalInstantiationScope::getPartiallySubstitutedPack( 3585 const TemplateArgument **ExplicitArgs, 3586 unsigned *NumExplicitArgs) const { 3587 if (ExplicitArgs) 3588 *ExplicitArgs = nullptr; 3589 if (NumExplicitArgs) 3590 *NumExplicitArgs = 0; 3591 3592 for (const LocalInstantiationScope *Current = this; Current; 3593 Current = Current->Outer) { 3594 if (Current->PartiallySubstitutedPack) { 3595 if (ExplicitArgs) 3596 *ExplicitArgs = Current->ArgsInPartiallySubstitutedPack; 3597 if (NumExplicitArgs) 3598 *NumExplicitArgs = Current->NumArgsInPartiallySubstitutedPack; 3599 3600 return Current->PartiallySubstitutedPack; 3601 } 3602 3603 if (!Current->CombineWithOuterScope) 3604 break; 3605 } 3606 3607 return nullptr; 3608}

/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/Sema/Sema.h

1//===--- Sema.h - Semantic Analysis & AST Building --------------*- C++ -*-===//
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//
9// This file defines the Sema class, which performs semantic analysis and
10// builds ASTs.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_CLANG_SEMA_SEMA_H
15#define LLVM_CLANG_SEMA_SEMA_H
16
17#include "clang/AST/ASTConcept.h"
18#include "clang/AST/ASTFwd.h"
19#include "clang/AST/Attr.h"
20#include "clang/AST/Availability.h"
21#include "clang/AST/ComparisonCategories.h"
22#include "clang/AST/DeclTemplate.h"
23#include "clang/AST/DeclarationName.h"
24#include "clang/AST/Expr.h"
25#include "clang/AST/ExprConcepts.h"
26#include "clang/AST/ExprCXX.h"
27#include "clang/AST/ExprObjC.h"
28#include "clang/AST/ExternalASTSource.h"
29#include "clang/AST/LocInfoType.h"
30#include "clang/AST/MangleNumberingContext.h"
31#include "clang/AST/NSAPI.h"
32#include "clang/AST/PrettyPrinter.h"
33#include "clang/AST/StmtCXX.h"
34#include "clang/AST/TypeLoc.h"
35#include "clang/AST/TypeOrdering.h"
36#include "clang/Basic/BitmaskEnum.h"
37#include "clang/Basic/ExpressionTraits.h"
38#include "clang/Basic/Module.h"
39#include "clang/Basic/OpenMPKinds.h"
40#include "clang/Basic/PragmaKinds.h"
41#include "clang/Basic/Specifiers.h"
42#include "clang/Basic/TemplateKinds.h"
43#include "clang/Basic/TypeTraits.h"
44#include "clang/Sema/AnalysisBasedWarnings.h"
45#include "clang/Sema/CleanupInfo.h"
46#include "clang/Sema/DeclSpec.h"
47#include "clang/Sema/ExternalSemaSource.h"
48#include "clang/Sema/IdentifierResolver.h"
49#include "clang/Sema/ObjCMethodList.h"
50#include "clang/Sema/Ownership.h"
51#include "clang/Sema/Scope.h"
52#include "clang/Sema/SemaConcept.h"
53#include "clang/Sema/TypoCorrection.h"
54#include "clang/Sema/Weak.h"
55#include "llvm/ADT/ArrayRef.h"
56#include "llvm/ADT/Optional.h"
57#include "llvm/ADT/SetVector.h"
58#include "llvm/ADT/SmallBitVector.h"
59#include "llvm/ADT/SmallPtrSet.h"
60#include "llvm/ADT/SmallVector.h"
61#include "llvm/ADT/TinyPtrVector.h"
62#include "llvm/Frontend/OpenMP/OMPConstants.h"
63#include <deque>
64#include <memory>
65#include <string>
66#include <tuple>
67#include <vector>
68
69namespace llvm {
70 class APSInt;
71 template <typename ValueT> struct DenseMapInfo;
72 template <typename ValueT, typename ValueInfoT> class DenseSet;
73 class SmallBitVector;
74 struct InlineAsmIdentifierInfo;
75}
76
77namespace clang {
78 class ADLResult;
79 class ASTConsumer;
80 class ASTContext;
81 class ASTMutationListener;
82 class ASTReader;
83 class ASTWriter;
84 class ArrayType;
85 class ParsedAttr;
86 class BindingDecl;
87 class BlockDecl;
88 class CapturedDecl;
89 class CXXBasePath;
90 class CXXBasePaths;
91 class CXXBindTemporaryExpr;
92 typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath;
93 class CXXConstructorDecl;
94 class CXXConversionDecl;
95 class CXXDeleteExpr;
96 class CXXDestructorDecl;
97 class CXXFieldCollector;
98 class CXXMemberCallExpr;
99 class CXXMethodDecl;
100 class CXXScopeSpec;
101 class CXXTemporary;
102 class CXXTryStmt;
103 class CallExpr;
104 class ClassTemplateDecl;
105 class ClassTemplatePartialSpecializationDecl;
106 class ClassTemplateSpecializationDecl;
107 class VarTemplatePartialSpecializationDecl;
108 class CodeCompleteConsumer;
109 class CodeCompletionAllocator;
110 class CodeCompletionTUInfo;
111 class CodeCompletionResult;
112 class CoroutineBodyStmt;
113 class Decl;
114 class DeclAccessPair;
115 class DeclContext;
116 class DeclRefExpr;
117 class DeclaratorDecl;
118 class DeducedTemplateArgument;
119 class DependentDiagnostic;
120 class DesignatedInitExpr;
121 class Designation;
122 class EnableIfAttr;
123 class EnumConstantDecl;
124 class Expr;
125 class ExtVectorType;
126 class FormatAttr;
127 class FriendDecl;
128 class FunctionDecl;
129 class FunctionProtoType;
130 class FunctionTemplateDecl;
131 class ImplicitConversionSequence;
132 typedef MutableArrayRef<ImplicitConversionSequence> ConversionSequenceList;
133 class InitListExpr;
134 class InitializationKind;
135 class InitializationSequence;
136 class InitializedEntity;
137 class IntegerLiteral;
138 class LabelStmt;
139 class LambdaExpr;
140 class LangOptions;
141 class LocalInstantiationScope;
142 class LookupResult;
143 class MacroInfo;
144 typedef ArrayRef<std::pair<IdentifierInfo *, SourceLocation>> ModuleIdPath;
145 class ModuleLoader;
146 class MultiLevelTemplateArgumentList;
147 class NamedDecl;
148 class ObjCCategoryDecl;
149 class ObjCCategoryImplDecl;
150 class ObjCCompatibleAliasDecl;
151 class ObjCContainerDecl;
152 class ObjCImplDecl;
153 class ObjCImplementationDecl;
154 class ObjCInterfaceDecl;
155 class ObjCIvarDecl;
156 template <class T> class ObjCList;
157 class ObjCMessageExpr;
158 class ObjCMethodDecl;
159 class ObjCPropertyDecl;
160 class ObjCProtocolDecl;
161 class OMPThreadPrivateDecl;
162 class OMPRequiresDecl;
163 class OMPDeclareReductionDecl;
164 class OMPDeclareSimdDecl;
165 class OMPClause;
166 struct OMPVarListLocTy;
167 struct OverloadCandidate;
168 enum class OverloadCandidateParamOrder : char;
169 enum OverloadCandidateRewriteKind : unsigned;
170 class OverloadCandidateSet;
171 class OverloadExpr;
172 class ParenListExpr;
173 class ParmVarDecl;
174 class Preprocessor;
175 class PseudoDestructorTypeStorage;
176 class PseudoObjectExpr;
177 class QualType;
178 class StandardConversionSequence;
179 class Stmt;
180 class StringLiteral;
181 class SwitchStmt;
182 class TemplateArgument;
183 class TemplateArgumentList;
184 class TemplateArgumentLoc;
185 class TemplateDecl;
186 class TemplateInstantiationCallback;
187 class TemplateParameterList;
188 class TemplatePartialOrderingContext;
189 class TemplateTemplateParmDecl;
190 class Token;
191 class TypeAliasDecl;
192 class TypedefDecl;
193 class TypedefNameDecl;
194 class TypeLoc;
195 class TypoCorrectionConsumer;
196 class UnqualifiedId;
197 class UnresolvedLookupExpr;
198 class UnresolvedMemberExpr;
199 class UnresolvedSetImpl;
200 class UnresolvedSetIterator;
201 class UsingDecl;
202 class UsingShadowDecl;
203 class ValueDecl;
204 class VarDecl;
205 class VarTemplateSpecializationDecl;
206 class VisibilityAttr;
207 class VisibleDeclConsumer;
208 class IndirectFieldDecl;
209 struct DeductionFailureInfo;
210 class TemplateSpecCandidateSet;
211
212namespace sema {
213 class AccessedEntity;
214 class BlockScopeInfo;
215 class Capture;
216 class CapturedRegionScopeInfo;
217 class CapturingScopeInfo;
218 class CompoundScopeInfo;
219 class DelayedDiagnostic;
220 class DelayedDiagnosticPool;
221 class FunctionScopeInfo;
222 class LambdaScopeInfo;
223 class PossiblyUnreachableDiag;
224 class SemaPPCallbacks;
225 class TemplateDeductionInfo;
226}
227
228namespace threadSafety {
229 class BeforeSet;
230 void threadSafetyCleanup(BeforeSet* Cache);
231}
232
233// FIXME: No way to easily map from TemplateTypeParmTypes to
234// TemplateTypeParmDecls, so we have this horrible PointerUnion.
235typedef std::pair<llvm::PointerUnion<const TemplateTypeParmType*, NamedDecl*>,
236 SourceLocation> UnexpandedParameterPack;
237
238/// Describes whether we've seen any nullability information for the given
239/// file.
240struct FileNullability {
241 /// The first pointer declarator (of any pointer kind) in the file that does
242 /// not have a corresponding nullability annotation.
243 SourceLocation PointerLoc;
244
245 /// The end location for the first pointer declarator in the file. Used for
246 /// placing fix-its.
247 SourceLocation PointerEndLoc;
248
249 /// Which kind of pointer declarator we saw.
250 uint8_t PointerKind;
251
252 /// Whether we saw any type nullability annotations in the given file.
253 bool SawTypeNullability = false;
254};
255
256/// A mapping from file IDs to a record of whether we've seen nullability
257/// information in that file.
258class FileNullabilityMap {
259 /// A mapping from file IDs to the nullability information for each file ID.
260 llvm::DenseMap<FileID, FileNullability> Map;
261
262 /// A single-element cache based on the file ID.
263 struct {
264 FileID File;
265 FileNullability Nullability;
266 } Cache;
267
268public:
269 FileNullability &operator[](FileID file) {
270 // Check the single-element cache.
271 if (file == Cache.File)
272 return Cache.Nullability;
273
274 // It's not in the single-element cache; flush the cache if we have one.
275 if (!Cache.File.isInvalid()) {
276 Map[Cache.File] = Cache.Nullability;
277 }
278
279 // Pull this entry into the cache.
280 Cache.File = file;
281 Cache.Nullability = Map[file];
282 return Cache.Nullability;
283 }
284};
285
286/// Keeps track of expected type during expression parsing. The type is tied to
287/// a particular token, all functions that update or consume the type take a
288/// start location of the token they are looking at as a parameter. This allows
289/// to avoid updating the type on hot paths in the parser.
290class PreferredTypeBuilder {
291public:
292 PreferredTypeBuilder() = default;
293 explicit PreferredTypeBuilder(QualType Type) : Type(Type) {}
294
295 void enterCondition(Sema &S, SourceLocation Tok);
296 void enterReturn(Sema &S, SourceLocation Tok);
297 void enterVariableInit(SourceLocation Tok, Decl *D);
298 /// Computing a type for the function argument may require running
299 /// overloading, so we postpone its computation until it is actually needed.
300 ///
301 /// Clients should be very careful when using this funciton, as it stores a
302 /// function_ref, clients should make sure all calls to get() with the same
303 /// location happen while function_ref is alive.
304 void enterFunctionArgument(SourceLocation Tok,
305 llvm::function_ref<QualType()> ComputeType);
306
307 void enterParenExpr(SourceLocation Tok, SourceLocation LParLoc);
308 void enterUnary(Sema &S, SourceLocation Tok, tok::TokenKind OpKind,
309 SourceLocation OpLoc);
310 void enterBinary(Sema &S, SourceLocation Tok, Expr *LHS, tok::TokenKind Op);
311 void enterMemAccess(Sema &S, SourceLocation Tok, Expr *Base);
312 void enterSubscript(Sema &S, SourceLocation Tok, Expr *LHS);
313 /// Handles all type casts, including C-style cast, C++ casts, etc.
314 void enterTypeCast(SourceLocation Tok, QualType CastType);
315
316 QualType get(SourceLocation Tok) const {
317 if (Tok != ExpectedLoc)
318 return QualType();
319 if (!Type.isNull())
320 return Type;
321 if (ComputeType)
322 return ComputeType();
323 return QualType();
324 }
325
326private:
327 /// Start position of a token for which we store expected type.
328 SourceLocation ExpectedLoc;
329 /// Expected type for a token starting at ExpectedLoc.
330 QualType Type;
331 /// A function to compute expected type at ExpectedLoc. It is only considered
332 /// if Type is null.
333 llvm::function_ref<QualType()> ComputeType;
334};
335
336/// Sema - This implements semantic analysis and AST building for C.
337class Sema final {
338 Sema(const Sema &) = delete;
339 void operator=(const Sema &) = delete;
340
341 /// A key method to reduce duplicate debug info from Sema.
342 virtual void anchor();
343
344 ///Source of additional semantic information.
345 ExternalSemaSource *ExternalSource;
346
347 ///Whether Sema has generated a multiplexer and has to delete it.
348 bool isMultiplexExternalSource;
349
350 static bool mightHaveNonExternalLinkage(const DeclaratorDecl *FD);
351
352 bool isVisibleSlow(const NamedDecl *D);
353
354 /// Determine whether two declarations should be linked together, given that
355 /// the old declaration might not be visible and the new declaration might
356 /// not have external linkage.
357 bool shouldLinkPossiblyHiddenDecl(const NamedDecl *Old,
358 const NamedDecl *New) {
359 if (isVisible(Old))
360 return true;
361 // See comment in below overload for why it's safe to compute the linkage
362 // of the new declaration here.
363 if (New->isExternallyDeclarable()) {
364 assert(Old->isExternallyDeclarable() &&((Old->isExternallyDeclarable() && "should not have found a non-externally-declarable previous decl"
) ? static_cast<void> (0) : __assert_fail ("Old->isExternallyDeclarable() && \"should not have found a non-externally-declarable previous decl\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/Sema/Sema.h"
, 365, __PRETTY_FUNCTION__))
365 "should not have found a non-externally-declarable previous decl")((Old->isExternallyDeclarable() && "should not have found a non-externally-declarable previous decl"
) ? static_cast<void> (0) : __assert_fail ("Old->isExternallyDeclarable() && \"should not have found a non-externally-declarable previous decl\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/Sema/Sema.h"
, 365, __PRETTY_FUNCTION__))
;
366 return true;
367 }
368 return false;
369 }
370 bool shouldLinkPossiblyHiddenDecl(LookupResult &Old, const NamedDecl *New);
371
372 void setupImplicitSpecialMemberType(CXXMethodDecl *SpecialMem,
373 QualType ResultTy,
374 ArrayRef<QualType> Args);
375
376public:
377 /// The maximum alignment, same as in llvm::Value. We duplicate them here
378 /// because that allows us not to duplicate the constants in clang code,
379 /// which we must to since we can't directly use the llvm constants.
380 /// The value is verified against llvm here: lib/CodeGen/CGDecl.cpp
381 ///
382 /// This is the greatest alignment value supported by load, store, and alloca
383 /// instructions, and global values.
384 static const unsigned MaxAlignmentExponent = 29;
385 static const unsigned MaximumAlignment = 1u << MaxAlignmentExponent;
386
387 typedef OpaquePtr<DeclGroupRef> DeclGroupPtrTy;
388 typedef OpaquePtr<TemplateName> TemplateTy;
389 typedef OpaquePtr<QualType> TypeTy;
390
391 OpenCLOptions OpenCLFeatures;
392 FPOptions FPFeatures;
393
394 const LangOptions &LangOpts;
395 Preprocessor &PP;
396 ASTContext &Context;
397 ASTConsumer &Consumer;
398 DiagnosticsEngine &Diags;
399 SourceManager &SourceMgr;
400
401 /// Flag indicating whether or not to collect detailed statistics.
402 bool CollectStats;
403
404 /// Code-completion consumer.
405 CodeCompleteConsumer *CodeCompleter;
406
407 /// CurContext - This is the current declaration context of parsing.
408 DeclContext *CurContext;
409
410 /// Generally null except when we temporarily switch decl contexts,
411 /// like in \see ActOnObjCTemporaryExitContainerContext.
412 DeclContext *OriginalLexicalContext;
413
414 /// VAListTagName - The declaration name corresponding to __va_list_tag.
415 /// This is used as part of a hack to omit that class from ADL results.
416 DeclarationName VAListTagName;
417
418 bool MSStructPragmaOn; // True when \#pragma ms_struct on
419
420 /// Controls member pointer representation format under the MS ABI.
421 LangOptions::PragmaMSPointersToMembersKind
422 MSPointerToMemberRepresentationMethod;
423
424 /// Stack of active SEH __finally scopes. Can be empty.
425 SmallVector<Scope*, 2> CurrentSEHFinally;
426
427 /// Source location for newly created implicit MSInheritanceAttrs
428 SourceLocation ImplicitMSInheritanceAttrLoc;
429
430 /// Holds TypoExprs that are created from `createDelayedTypo`. This is used by
431 /// `TransformTypos` in order to keep track of any TypoExprs that are created
432 /// recursively during typo correction and wipe them away if the correction
433 /// fails.
434 llvm::SmallVector<TypoExpr *, 2> TypoExprs;
435
436 /// pragma clang section kind
437 enum PragmaClangSectionKind {
438 PCSK_Invalid = 0,
439 PCSK_BSS = 1,
440 PCSK_Data = 2,
441 PCSK_Rodata = 3,
442 PCSK_Text = 4,
443 PCSK_Relro = 5
444 };
445
446 enum PragmaClangSectionAction {
447 PCSA_Set = 0,
448 PCSA_Clear = 1
449 };
450
451 struct PragmaClangSection {
452 std::string SectionName;
453 bool Valid = false;
454 SourceLocation PragmaLocation;
455
456 void Act(SourceLocation PragmaLocation,
457 PragmaClangSectionAction Action,
458 StringLiteral* Name);
459 };
460
461 PragmaClangSection PragmaClangBSSSection;
462 PragmaClangSection PragmaClangDataSection;
463 PragmaClangSection PragmaClangRodataSection;
464 PragmaClangSection PragmaClangRelroSection;
465 PragmaClangSection PragmaClangTextSection;
466
467 enum PragmaMsStackAction {
468 PSK_Reset = 0x0, // #pragma ()
469 PSK_Set = 0x1, // #pragma (value)
470 PSK_Push = 0x2, // #pragma (push[, id])
471 PSK_Pop = 0x4, // #pragma (pop[, id])
472 PSK_Show = 0x8, // #pragma (show) -- only for "pack"!
473 PSK_Push_Set = PSK_Push | PSK_Set, // #pragma (push[, id], value)
474 PSK_Pop_Set = PSK_Pop | PSK_Set, // #pragma (pop[, id], value)
475 };
476
477 template<typename ValueType>
478 struct PragmaStack {
479 struct Slot {
480 llvm::StringRef StackSlotLabel;
481 ValueType Value;
482 SourceLocation PragmaLocation;
483 SourceLocation PragmaPushLocation;
484 Slot(llvm::StringRef StackSlotLabel, ValueType Value,
485 SourceLocation PragmaLocation, SourceLocation PragmaPushLocation)
486 : StackSlotLabel(StackSlotLabel), Value(Value),
487 PragmaLocation(PragmaLocation),
488 PragmaPushLocation(PragmaPushLocation) {}
489 };
490 void Act(SourceLocation PragmaLocation,
491 PragmaMsStackAction Action,
492 llvm::StringRef StackSlotLabel,
493 ValueType Value);
494
495 // MSVC seems to add artificial slots to #pragma stacks on entering a C++
496 // method body to restore the stacks on exit, so it works like this:
497 //
498 // struct S {
499 // #pragma <name>(push, InternalPragmaSlot, <current_pragma_value>)
500 // void Method {}
501 // #pragma <name>(pop, InternalPragmaSlot)
502 // };
503 //
504 // It works even with #pragma vtordisp, although MSVC doesn't support
505 // #pragma vtordisp(push [, id], n)
506 // syntax.
507 //
508 // Push / pop a named sentinel slot.
509 void SentinelAction(PragmaMsStackAction Action, StringRef Label) {
510 assert((Action == PSK_Push || Action == PSK_Pop) &&(((Action == PSK_Push || Action == PSK_Pop) && "Can only push / pop #pragma stack sentinels!"
) ? static_cast<void> (0) : __assert_fail ("(Action == PSK_Push || Action == PSK_Pop) && \"Can only push / pop #pragma stack sentinels!\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/Sema/Sema.h"
, 511, __PRETTY_FUNCTION__))
511 "Can only push / pop #pragma stack sentinels!")(((Action == PSK_Push || Action == PSK_Pop) && "Can only push / pop #pragma stack sentinels!"
) ? static_cast<void> (0) : __assert_fail ("(Action == PSK_Push || Action == PSK_Pop) && \"Can only push / pop #pragma stack sentinels!\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/Sema/Sema.h"
, 511, __PRETTY_FUNCTION__))
;
512 Act(CurrentPragmaLocation, Action, Label, CurrentValue);
513 }
514
515 // Constructors.
516 explicit PragmaStack(const ValueType &Default)
517 : DefaultValue(Default), CurrentValue(Default) {}
518
519 bool hasValue() const { return CurrentValue != DefaultValue; }
520
521 SmallVector<Slot, 2> Stack;
522 ValueType DefaultValue; // Value used for PSK_Reset action.
523 ValueType CurrentValue;
524 SourceLocation CurrentPragmaLocation;
525 };
526 // FIXME: We should serialize / deserialize these if they occur in a PCH (but
527 // we shouldn't do so if they're in a module).
528
529 /// Whether to insert vtordisps prior to virtual bases in the Microsoft
530 /// C++ ABI. Possible values are 0, 1, and 2, which mean:
531 ///
532 /// 0: Suppress all vtordisps
533 /// 1: Insert vtordisps in the presence of vbase overrides and non-trivial
534 /// structors
535 /// 2: Always insert vtordisps to support RTTI on partially constructed
536 /// objects
537 PragmaStack<MSVtorDispMode> VtorDispStack;
538 // #pragma pack.
539 // Sentinel to represent when the stack is set to mac68k alignment.
540 static const unsigned kMac68kAlignmentSentinel = ~0U;
541 PragmaStack<unsigned> PackStack;
542 // The current #pragma pack values and locations at each #include.
543 struct PackIncludeState {
544 unsigned CurrentValue;
545 SourceLocation CurrentPragmaLocation;
546 bool HasNonDefaultValue, ShouldWarnOnInclude;
547 };
548 SmallVector<PackIncludeState, 8> PackIncludeStack;
549 // Segment #pragmas.
550 PragmaStack<StringLiteral *> DataSegStack;
551 PragmaStack<StringLiteral *> BSSSegStack;
552 PragmaStack<StringLiteral *> ConstSegStack;
553 PragmaStack<StringLiteral *> CodeSegStack;
554
555 // RAII object to push / pop sentinel slots for all MS #pragma stacks.
556 // Actions should be performed only if we enter / exit a C++ method body.
557 class PragmaStackSentinelRAII {
558 public:
559 PragmaStackSentinelRAII(Sema &S, StringRef SlotLabel, bool ShouldAct);
560 ~PragmaStackSentinelRAII();
561
562 private:
563 Sema &S;
564 StringRef SlotLabel;
565 bool ShouldAct;
566 };
567
568 /// A mapping that describes the nullability we've seen in each header file.
569 FileNullabilityMap NullabilityMap;
570
571 /// Last section used with #pragma init_seg.
572 StringLiteral *CurInitSeg;
573 SourceLocation CurInitSegLoc;
574
575 /// VisContext - Manages the stack for \#pragma GCC visibility.
576 void *VisContext; // Really a "PragmaVisStack*"
577
578 /// This an attribute introduced by \#pragma clang attribute.
579 struct PragmaAttributeEntry {
580 SourceLocation Loc;
581 ParsedAttr *Attribute;
582 SmallVector<attr::SubjectMatchRule, 4> MatchRules;
583 bool IsUsed;
584 };
585
586 /// A push'd group of PragmaAttributeEntries.
587 struct PragmaAttributeGroup {
588 /// The location of the push attribute.
589 SourceLocation Loc;
590 /// The namespace of this push group.
591 const IdentifierInfo *Namespace;
592 SmallVector<PragmaAttributeEntry, 2> Entries;
593 };
594
595 SmallVector<PragmaAttributeGroup, 2> PragmaAttributeStack;
596
597 /// The declaration that is currently receiving an attribute from the
598 /// #pragma attribute stack.
599 const Decl *PragmaAttributeCurrentTargetDecl;
600
601 /// This represents the last location of a "#pragma clang optimize off"
602 /// directive if such a directive has not been closed by an "on" yet. If
603 /// optimizations are currently "on", this is set to an invalid location.
604 SourceLocation OptimizeOffPragmaLocation;
605
606 /// Flag indicating if Sema is building a recovery call expression.
607 ///
608 /// This flag is used to avoid building recovery call expressions
609 /// if Sema is already doing so, which would cause infinite recursions.
610 bool IsBuildingRecoveryCallExpr;
611
612 /// Used to control the generation of ExprWithCleanups.
613 CleanupInfo Cleanup;
614
615 /// ExprCleanupObjects - This is the stack of objects requiring
616 /// cleanup that are created by the current full expression. The
617 /// element type here is ExprWithCleanups::Object.
618 SmallVector<BlockDecl*, 8> ExprCleanupObjects;
619
620 /// Store a set of either DeclRefExprs or MemberExprs that contain a reference
621 /// to a variable (constant) that may or may not be odr-used in this Expr, and
622 /// we won't know until all lvalue-to-rvalue and discarded value conversions
623 /// have been applied to all subexpressions of the enclosing full expression.
624 /// This is cleared at the end of each full expression.
625 using MaybeODRUseExprSet = llvm::SmallPtrSet<Expr *, 2>;
626 MaybeODRUseExprSet MaybeODRUseExprs;
627
628 std::unique_ptr<sema::FunctionScopeInfo> CachedFunctionScope;
629
630 /// Stack containing information about each of the nested
631 /// function, block, and method scopes that are currently active.
632 SmallVector<sema::FunctionScopeInfo *, 4> FunctionScopes;
633
634 /// Stack containing information needed when in C++2a an 'auto' is encountered
635 /// in a function declaration parameter type specifier in order to invent a
636 /// corresponding template parameter in the enclosing abbreviated function
637 /// template. This information is also present in LambdaScopeInfo, stored in
638 /// the FunctionScopes stack.
639 SmallVector<InventedTemplateParameterInfo, 4> InventedParameterInfos;
640
641 typedef LazyVector<TypedefNameDecl *, ExternalSemaSource,
642 &ExternalSemaSource::ReadExtVectorDecls, 2, 2>
643 ExtVectorDeclsType;
644
645 /// ExtVectorDecls - This is a list all the extended vector types. This allows
646 /// us to associate a raw vector type with one of the ext_vector type names.
647 /// This is only necessary for issuing pretty diagnostics.
648 ExtVectorDeclsType ExtVectorDecls;
649
650 /// FieldCollector - Collects CXXFieldDecls during parsing of C++ classes.
651 std::unique_ptr<CXXFieldCollector> FieldCollector;
652
653 typedef llvm::SmallSetVector<NamedDecl *, 16> NamedDeclSetType;
654
655 /// Set containing all declared private fields that are not used.
656 NamedDeclSetType UnusedPrivateFields;
657
658 /// Set containing all typedefs that are likely unused.
659 llvm::SmallSetVector<const TypedefNameDecl *, 4>
660 UnusedLocalTypedefNameCandidates;
661
662 /// Delete-expressions to be analyzed at the end of translation unit
663 ///
664 /// This list contains class members, and locations of delete-expressions
665 /// that could not be proven as to whether they mismatch with new-expression
666 /// used in initializer of the field.
667 typedef std::pair<SourceLocation, bool> DeleteExprLoc;
668 typedef llvm::SmallVector<DeleteExprLoc, 4> DeleteLocs;
669 llvm::MapVector<FieldDecl *, DeleteLocs> DeleteExprs;
670
671 typedef llvm::SmallPtrSet<const CXXRecordDecl*, 8> RecordDeclSetTy;
672
673 /// PureVirtualClassDiagSet - a set of class declarations which we have
674 /// emitted a list of pure virtual functions. Used to prevent emitting the
675 /// same list more than once.
676 std::unique_ptr<RecordDeclSetTy> PureVirtualClassDiagSet;
677
678 /// ParsingInitForAutoVars - a set of declarations with auto types for which
679 /// we are currently parsing the initializer.
680 llvm::SmallPtrSet<const Decl*, 4> ParsingInitForAutoVars;
681
682 /// Look for a locally scoped extern "C" declaration by the given name.
683 NamedDecl *findLocallyScopedExternCDecl(DeclarationName Name);
684
685 typedef LazyVector<VarDecl *, ExternalSemaSource,
686 &ExternalSemaSource::ReadTentativeDefinitions, 2, 2>
687 TentativeDefinitionsType;
688
689 /// All the tentative definitions encountered in the TU.
690 TentativeDefinitionsType TentativeDefinitions;
691
692 /// All the external declarations encoutered and used in the TU.
693 SmallVector<VarDecl *, 4> ExternalDeclarations;
694
695 typedef LazyVector<const DeclaratorDecl *, ExternalSemaSource,
696 &ExternalSemaSource::ReadUnusedFileScopedDecls, 2, 2>
697 UnusedFileScopedDeclsType;
698
699 /// The set of file scoped decls seen so far that have not been used
700 /// and must warn if not used. Only contains the first declaration.
701 UnusedFileScopedDeclsType UnusedFileScopedDecls;
702
703 typedef LazyVector<CXXConstructorDecl *, ExternalSemaSource,
704 &ExternalSemaSource::ReadDelegatingConstructors, 2, 2>
705 DelegatingCtorDeclsType;
706
707 /// All the delegating constructors seen so far in the file, used for
708 /// cycle detection at the end of the TU.
709 DelegatingCtorDeclsType DelegatingCtorDecls;
710
711 /// All the overriding functions seen during a class definition
712 /// that had their exception spec checks delayed, plus the overridden
713 /// function.
714 SmallVector<std::pair<const CXXMethodDecl*, const CXXMethodDecl*>, 2>
715 DelayedOverridingExceptionSpecChecks;
716
717 /// All the function redeclarations seen during a class definition that had
718 /// their exception spec checks delayed, plus the prior declaration they
719 /// should be checked against. Except during error recovery, the new decl
720 /// should always be a friend declaration, as that's the only valid way to
721 /// redeclare a special member before its class is complete.
722 SmallVector<std::pair<FunctionDecl*, FunctionDecl*>, 2>
723 DelayedEquivalentExceptionSpecChecks;
724
725 typedef llvm::MapVector<const FunctionDecl *,
726 std::unique_ptr<LateParsedTemplate>>
727 LateParsedTemplateMapT;
728 LateParsedTemplateMapT LateParsedTemplateMap;
729
730 /// Callback to the parser to parse templated functions when needed.
731 typedef void LateTemplateParserCB(void *P, LateParsedTemplate &LPT);
732 typedef void LateTemplateParserCleanupCB(void *P);
733 LateTemplateParserCB *LateTemplateParser;
734 LateTemplateParserCleanupCB *LateTemplateParserCleanup;
735 void *OpaqueParser;
736
737 void SetLateTemplateParser(LateTemplateParserCB *LTP,
738 LateTemplateParserCleanupCB *LTPCleanup,
739 void *P) {
740 LateTemplateParser = LTP;
741 LateTemplateParserCleanup = LTPCleanup;
742 OpaqueParser = P;
743 }
744
745 class DelayedDiagnostics;
746
747 class DelayedDiagnosticsState {
748 sema::DelayedDiagnosticPool *SavedPool;
749 friend class Sema::DelayedDiagnostics;
750 };
751 typedef DelayedDiagnosticsState ParsingDeclState;
752 typedef DelayedDiagnosticsState ProcessingContextState;
753
754 /// A class which encapsulates the logic for delaying diagnostics
755 /// during parsing and other processing.
756 class DelayedDiagnostics {
757 /// The current pool of diagnostics into which delayed
758 /// diagnostics should go.
759 sema::DelayedDiagnosticPool *CurPool;
760
761 public:
762 DelayedDiagnostics() : CurPool(nullptr) {}
763
764 /// Adds a delayed diagnostic.
765 void add(const sema::DelayedDiagnostic &diag); // in DelayedDiagnostic.h
766
767 /// Determines whether diagnostics should be delayed.
768 bool shouldDelayDiagnostics() { return CurPool != nullptr; }
769
770 /// Returns the current delayed-diagnostics pool.
771 sema::DelayedDiagnosticPool *getCurrentPool() const {
772 return CurPool;
773 }
774
775 /// Enter a new scope. Access and deprecation diagnostics will be
776 /// collected in this pool.
777 DelayedDiagnosticsState push(sema::DelayedDiagnosticPool &pool) {
778 DelayedDiagnosticsState state;
779 state.SavedPool = CurPool;
780 CurPool = &pool;
781 return state;
782 }
783
784 /// Leave a delayed-diagnostic state that was previously pushed.
785 /// Do not emit any of the diagnostics. This is performed as part
786 /// of the bookkeeping of popping a pool "properly".
787 void popWithoutEmitting(DelayedDiagnosticsState state) {
788 CurPool = state.SavedPool;
789 }
790
791 /// Enter a new scope where access and deprecation diagnostics are
792 /// not delayed.
793 DelayedDiagnosticsState pushUndelayed() {
794 DelayedDiagnosticsState state;
795 state.SavedPool = CurPool;
796 CurPool = nullptr;
797 return state;
798 }
799
800 /// Undo a previous pushUndelayed().
801 void popUndelayed(DelayedDiagnosticsState state) {
802 assert(CurPool == nullptr)((CurPool == nullptr) ? static_cast<void> (0) : __assert_fail
("CurPool == nullptr", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/Sema/Sema.h"
, 802, __PRETTY_FUNCTION__))
;
803 CurPool = state.SavedPool;
804 }
805 } DelayedDiagnostics;
806
807 /// A RAII object to temporarily push a declaration context.
808 class ContextRAII {
809 private:
810 Sema &S;
811 DeclContext *SavedContext;
812 ProcessingContextState SavedContextState;
813 QualType SavedCXXThisTypeOverride;
814
815 public:
816 ContextRAII(Sema &S, DeclContext *ContextToPush, bool NewThisContext = true)
817 : S(S), SavedContext(S.CurContext),
818 SavedContextState(S.DelayedDiagnostics.pushUndelayed()),
819 SavedCXXThisTypeOverride(S.CXXThisTypeOverride)
820 {
821 assert(ContextToPush && "pushing null context")((ContextToPush && "pushing null context") ? static_cast
<void> (0) : __assert_fail ("ContextToPush && \"pushing null context\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/Sema/Sema.h"
, 821, __PRETTY_FUNCTION__))
;
822 S.CurContext = ContextToPush;
823 if (NewThisContext)
824 S.CXXThisTypeOverride = QualType();
825 }
826
827 void pop() {
828 if (!SavedContext) return;
829 S.CurContext = SavedContext;
830 S.DelayedDiagnostics.popUndelayed(SavedContextState);
831 S.CXXThisTypeOverride = SavedCXXThisTypeOverride;
832 SavedContext = nullptr;
833 }
834
835 ~ContextRAII() {
836 pop();
837 }
838 };
839
840 /// Whether the AST is currently being rebuilt to correct immediate
841 /// invocations. Immediate invocation candidates and references to consteval
842 /// functions aren't tracked when this is set.
843 bool RebuildingImmediateInvocation = false;
844
845 /// Used to change context to isConstantEvaluated without pushing a heavy
846 /// ExpressionEvaluationContextRecord object.
847 bool isConstantEvaluatedOverride;
848
849 bool isConstantEvaluated() {
850 return ExprEvalContexts.back().isConstantEvaluated() ||
851 isConstantEvaluatedOverride;
852 }
853
854 /// RAII object to handle the state changes required to synthesize
855 /// a function body.
856 class SynthesizedFunctionScope {
857 Sema &S;
858 Sema::ContextRAII SavedContext;
859 bool PushedCodeSynthesisContext = false;
860
861 public:
862 SynthesizedFunctionScope(Sema &S, DeclContext *DC)
863 : S(S), SavedContext(S, DC) {
864 S.PushFunctionScope();
865 S.PushExpressionEvaluationContext(
866 Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
867 if (auto *FD = dyn_cast<FunctionDecl>(DC))
868 FD->setWillHaveBody(true);
869 else
870 assert(isa<ObjCMethodDecl>(DC))((isa<ObjCMethodDecl>(DC)) ? static_cast<void> (0
) : __assert_fail ("isa<ObjCMethodDecl>(DC)", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/Sema/Sema.h"
, 870, __PRETTY_FUNCTION__))
;
871 }
872
873 void addContextNote(SourceLocation UseLoc) {
874 assert(!PushedCodeSynthesisContext)((!PushedCodeSynthesisContext) ? static_cast<void> (0) :
__assert_fail ("!PushedCodeSynthesisContext", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/Sema/Sema.h"
, 874, __PRETTY_FUNCTION__))
;
875
876 Sema::CodeSynthesisContext Ctx;
877 Ctx.Kind = Sema::CodeSynthesisContext::DefiningSynthesizedFunction;
878 Ctx.PointOfInstantiation = UseLoc;
879 Ctx.Entity = cast<Decl>(S.CurContext);
880 S.pushCodeSynthesisContext(Ctx);
881
882 PushedCodeSynthesisContext = true;
883 }
884
885 ~SynthesizedFunctionScope() {
886 if (PushedCodeSynthesisContext)
887 S.popCodeSynthesisContext();
888 if (auto *FD = dyn_cast<FunctionDecl>(S.CurContext))
889 FD->setWillHaveBody(false);
890 S.PopExpressionEvaluationContext();
891 S.PopFunctionScopeInfo();
892 }
893 };
894
895 /// WeakUndeclaredIdentifiers - Identifiers contained in
896 /// \#pragma weak before declared. rare. may alias another
897 /// identifier, declared or undeclared
898 llvm::MapVector<IdentifierInfo *, WeakInfo> WeakUndeclaredIdentifiers;
899
900 /// ExtnameUndeclaredIdentifiers - Identifiers contained in
901 /// \#pragma redefine_extname before declared. Used in Solaris system headers
902 /// to define functions that occur in multiple standards to call the version
903 /// in the currently selected standard.
904 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*> ExtnameUndeclaredIdentifiers;
905
906
907 /// Load weak undeclared identifiers from the external source.
908 void LoadExternalWeakUndeclaredIdentifiers();
909
910 /// WeakTopLevelDecl - Translation-unit scoped declarations generated by
911 /// \#pragma weak during processing of other Decls.
912 /// I couldn't figure out a clean way to generate these in-line, so
913 /// we store them here and handle separately -- which is a hack.
914 /// It would be best to refactor this.
915 SmallVector<Decl*,2> WeakTopLevelDecl;
916
917 IdentifierResolver IdResolver;
918
919 /// Translation Unit Scope - useful to Objective-C actions that need
920 /// to lookup file scope declarations in the "ordinary" C decl namespace.
921 /// For example, user-defined classes, built-in "id" type, etc.
922 Scope *TUScope;
923
924 /// The C++ "std" namespace, where the standard library resides.
925 LazyDeclPtr StdNamespace;
926
927 /// The C++ "std::bad_alloc" class, which is defined by the C++
928 /// standard library.
929 LazyDeclPtr StdBadAlloc;
930
931 /// The C++ "std::align_val_t" enum class, which is defined by the C++
932 /// standard library.
933 LazyDeclPtr StdAlignValT;
934
935 /// The C++ "std::experimental" namespace, where the experimental parts
936 /// of the standard library resides.
937 NamespaceDecl *StdExperimentalNamespaceCache;
938
939 /// The C++ "std::initializer_list" template, which is defined in
940 /// \<initializer_list>.
941 ClassTemplateDecl *StdInitializerList;
942
943 /// The C++ "std::coroutine_traits" template, which is defined in
944 /// \<coroutine_traits>
945 ClassTemplateDecl *StdCoroutineTraitsCache;
946
947 /// The C++ "type_info" declaration, which is defined in \<typeinfo>.
948 RecordDecl *CXXTypeInfoDecl;
949
950 /// The MSVC "_GUID" struct, which is defined in MSVC header files.
951 RecordDecl *MSVCGuidDecl;
952
953 /// Caches identifiers/selectors for NSFoundation APIs.
954 std::unique_ptr<NSAPI> NSAPIObj;
955
956 /// The declaration of the Objective-C NSNumber class.
957 ObjCInterfaceDecl *NSNumberDecl;
958
959 /// The declaration of the Objective-C NSValue class.
960 ObjCInterfaceDecl *NSValueDecl;
961
962 /// Pointer to NSNumber type (NSNumber *).
963 QualType NSNumberPointer;
964
965 /// Pointer to NSValue type (NSValue *).
966 QualType NSValuePointer;
967
968 /// The Objective-C NSNumber methods used to create NSNumber literals.
969 ObjCMethodDecl *NSNumberLiteralMethods[NSAPI::NumNSNumberLiteralMethods];
970
971 /// The declaration of the Objective-C NSString class.
972 ObjCInterfaceDecl *NSStringDecl;
973
974 /// Pointer to NSString type (NSString *).
975 QualType NSStringPointer;
976
977 /// The declaration of the stringWithUTF8String: method.
978 ObjCMethodDecl *StringWithUTF8StringMethod;
979
980 /// The declaration of the valueWithBytes:objCType: method.
981 ObjCMethodDecl *ValueWithBytesObjCTypeMethod;
982
983 /// The declaration of the Objective-C NSArray class.
984 ObjCInterfaceDecl *NSArrayDecl;
985
986 /// The declaration of the arrayWithObjects:count: method.
987 ObjCMethodDecl *ArrayWithObjectsMethod;
988
989 /// The declaration of the Objective-C NSDictionary class.
990 ObjCInterfaceDecl *NSDictionaryDecl;
991
992 /// The declaration of the dictionaryWithObjects:forKeys:count: method.
993 ObjCMethodDecl *DictionaryWithObjectsMethod;
994
995 /// id<NSCopying> type.
996 QualType QIDNSCopying;
997
998 /// will hold 'respondsToSelector:'
999 Selector RespondsToSelectorSel;
1000
1001 /// A flag to remember whether the implicit forms of operator new and delete
1002 /// have been declared.
1003 bool GlobalNewDeleteDeclared;
1004
1005 /// A flag to indicate that we're in a context that permits abstract
1006 /// references to fields. This is really a
1007 bool AllowAbstractFieldReference;
1008
1009 /// Describes how the expressions currently being parsed are
1010 /// evaluated at run-time, if at all.
1011 enum class ExpressionEvaluationContext {
1012 /// The current expression and its subexpressions occur within an
1013 /// unevaluated operand (C++11 [expr]p7), such as the subexpression of
1014 /// \c sizeof, where the type of the expression may be significant but
1015 /// no code will be generated to evaluate the value of the expression at
1016 /// run time.
1017 Unevaluated,
1018
1019 /// The current expression occurs within a braced-init-list within
1020 /// an unevaluated operand. This is mostly like a regular unevaluated
1021 /// context, except that we still instantiate constexpr functions that are
1022 /// referenced here so that we can perform narrowing checks correctly.
1023 UnevaluatedList,
1024
1025 /// The current expression occurs within a discarded statement.
1026 /// This behaves largely similarly to an unevaluated operand in preventing
1027 /// definitions from being required, but not in other ways.
1028 DiscardedStatement,
1029
1030 /// The current expression occurs within an unevaluated
1031 /// operand that unconditionally permits abstract references to
1032 /// fields, such as a SIZE operator in MS-style inline assembly.
1033 UnevaluatedAbstract,
1034
1035 /// The current context is "potentially evaluated" in C++11 terms,
1036 /// but the expression is evaluated at compile-time (like the values of
1037 /// cases in a switch statement).
1038 ConstantEvaluated,
1039
1040 /// The current expression is potentially evaluated at run time,
1041 /// which means that code may be generated to evaluate the value of the
1042 /// expression at run time.
1043 PotentiallyEvaluated,
1044
1045 /// The current expression is potentially evaluated, but any
1046 /// declarations referenced inside that expression are only used if
1047 /// in fact the current expression is used.
1048 ///
1049 /// This value is used when parsing default function arguments, for which
1050 /// we would like to provide diagnostics (e.g., passing non-POD arguments
1051 /// through varargs) but do not want to mark declarations as "referenced"
1052 /// until the default argument is used.
1053 PotentiallyEvaluatedIfUsed
1054 };
1055
1056 using ImmediateInvocationCandidate = llvm::PointerIntPair<ConstantExpr *, 1>;
1057
1058 /// Data structure used to record current or nested
1059 /// expression evaluation contexts.
1060 struct ExpressionEvaluationContextRecord {
1061 /// The expression evaluation context.
1062 ExpressionEvaluationContext Context;
1063
1064 /// Whether the enclosing context needed a cleanup.
1065 CleanupInfo ParentCleanup;
1066
1067 /// Whether we are in a decltype expression.
1068 bool IsDecltype;
1069
1070 /// The number of active cleanup objects when we entered
1071 /// this expression evaluation context.
1072 unsigned NumCleanupObjects;
1073
1074 /// The number of typos encountered during this expression evaluation
1075 /// context (i.e. the number of TypoExprs created).
1076 unsigned NumTypos;
1077
1078 MaybeODRUseExprSet SavedMaybeODRUseExprs;
1079
1080 /// The lambdas that are present within this context, if it
1081 /// is indeed an unevaluated context.
1082 SmallVector<LambdaExpr *, 2> Lambdas;
1083
1084 /// The declaration that provides context for lambda expressions
1085 /// and block literals if the normal declaration context does not
1086 /// suffice, e.g., in a default function argument.
1087 Decl *ManglingContextDecl;
1088
1089 /// If we are processing a decltype type, a set of call expressions
1090 /// for which we have deferred checking the completeness of the return type.
1091 SmallVector<CallExpr *, 8> DelayedDecltypeCalls;
1092
1093 /// If we are processing a decltype type, a set of temporary binding
1094 /// expressions for which we have deferred checking the destructor.
1095 SmallVector<CXXBindTemporaryExpr *, 8> DelayedDecltypeBinds;
1096
1097 llvm::SmallPtrSet<const Expr *, 8> PossibleDerefs;
1098
1099 /// Expressions appearing as the LHS of a volatile assignment in this
1100 /// context. We produce a warning for these when popping the context if
1101 /// they are not discarded-value expressions nor unevaluated operands.
1102 SmallVector<Expr*, 2> VolatileAssignmentLHSs;
1103
1104 /// Set of candidates for starting an immediate invocation.
1105 llvm::SmallVector<ImmediateInvocationCandidate, 4> ImmediateInvocationCandidates;
1106
1107 /// Set of DeclRefExprs referencing a consteval function when used in a
1108 /// context not already known to be immediately invoked.
1109 llvm::SmallPtrSet<DeclRefExpr *, 4> ReferenceToConsteval;
1110
1111 /// \brief Describes whether we are in an expression constext which we have
1112 /// to handle differently.
1113 enum ExpressionKind {
1114 EK_Decltype, EK_TemplateArgument, EK_Other
1115 } ExprContext;
1116
1117 ExpressionEvaluationContextRecord(ExpressionEvaluationContext Context,
1118 unsigned NumCleanupObjects,
1119 CleanupInfo ParentCleanup,
1120 Decl *ManglingContextDecl,
1121 ExpressionKind ExprContext)
1122 : Context(Context), ParentCleanup(ParentCleanup),
1123 NumCleanupObjects(NumCleanupObjects), NumTypos(0),
1124 ManglingContextDecl(ManglingContextDecl), ExprContext(ExprContext) {}
1125
1126 bool isUnevaluated() const {
1127 return Context == ExpressionEvaluationContext::Unevaluated ||
1128 Context == ExpressionEvaluationContext::UnevaluatedAbstract ||
1129 Context == ExpressionEvaluationContext::UnevaluatedList;
1130 }
1131 bool isConstantEvaluated() const {
1132 return Context == ExpressionEvaluationContext::ConstantEvaluated;
1133 }
1134 };
1135
1136 /// A stack of expression evaluation contexts.
1137 SmallVector<ExpressionEvaluationContextRecord, 8> ExprEvalContexts;
1138
1139 /// Emit a warning for all pending noderef expressions that we recorded.
1140 void WarnOnPendingNoDerefs(ExpressionEvaluationContextRecord &Rec);
1141
1142 /// Compute the mangling number context for a lambda expression or
1143 /// block literal. Also return the extra mangling decl if any.
1144 ///
1145 /// \param DC - The DeclContext containing the lambda expression or
1146 /// block literal.
1147 std::tuple<MangleNumberingContext *, Decl *>
1148 getCurrentMangleNumberContext(const DeclContext *DC);
1149
1150
1151 /// SpecialMemberOverloadResult - The overloading result for a special member
1152 /// function.
1153 ///
1154 /// This is basically a wrapper around PointerIntPair. The lowest bits of the
1155 /// integer are used to determine whether overload resolution succeeded.
1156 class SpecialMemberOverloadResult {
1157 public:
1158 enum Kind {
1159 NoMemberOrDeleted,
1160 Ambiguous,
1161 Success
1162 };
1163
1164 private:
1165 llvm::PointerIntPair<CXXMethodDecl*, 2> Pair;
1166
1167 public:
1168 SpecialMemberOverloadResult() : Pair() {}
1169 SpecialMemberOverloadResult(CXXMethodDecl *MD)
1170 : Pair(MD, MD->isDeleted() ? NoMemberOrDeleted : Success) {}
1171
1172 CXXMethodDecl *getMethod() const { return Pair.getPointer(); }
1173 void setMethod(CXXMethodDecl *MD) { Pair.setPointer(MD); }
1174
1175 Kind getKind() const { return static_cast<Kind>(Pair.getInt()); }
1176 void setKind(Kind K) { Pair.setInt(K); }
1177 };
1178
1179 class SpecialMemberOverloadResultEntry
1180 : public llvm::FastFoldingSetNode,
1181 public SpecialMemberOverloadResult {
1182 public:
1183 SpecialMemberOverloadResultEntry(const llvm::FoldingSetNodeID &ID)
1184 : FastFoldingSetNode(ID)
1185 {}
1186 };
1187
1188 /// A cache of special member function overload resolution results
1189 /// for C++ records.
1190 llvm::FoldingSet<SpecialMemberOverloadResultEntry> SpecialMemberCache;
1191
1192 /// A cache of the flags available in enumerations with the flag_bits
1193 /// attribute.
1194 mutable llvm::DenseMap<const EnumDecl*, llvm::APInt> FlagBitsCache;
1195
1196 /// The kind of translation unit we are processing.
1197 ///
1198 /// When we're processing a complete translation unit, Sema will perform
1199 /// end-of-translation-unit semantic tasks (such as creating
1200 /// initializers for tentative definitions in C) once parsing has
1201 /// completed. Modules and precompiled headers perform different kinds of
1202 /// checks.
1203 TranslationUnitKind TUKind;
1204
1205 llvm::BumpPtrAllocator BumpAlloc;
1206
1207 /// The number of SFINAE diagnostics that have been trapped.
1208 unsigned NumSFINAEErrors;
1209
1210 typedef llvm::DenseMap<ParmVarDecl *, llvm::TinyPtrVector<ParmVarDecl *>>
1211 UnparsedDefaultArgInstantiationsMap;
1212
1213 /// A mapping from parameters with unparsed default arguments to the
1214 /// set of instantiations of each parameter.
1215 ///
1216 /// This mapping is a temporary data structure used when parsing
1217 /// nested class templates or nested classes of class templates,
1218 /// where we might end up instantiating an inner class before the
1219 /// default arguments of its methods have been parsed.
1220 UnparsedDefaultArgInstantiationsMap UnparsedDefaultArgInstantiations;
1221
1222 // Contains the locations of the beginning of unparsed default
1223 // argument locations.
1224 llvm::DenseMap<ParmVarDecl *, SourceLocation> UnparsedDefaultArgLocs;
1225
1226 /// UndefinedInternals - all the used, undefined objects which require a
1227 /// definition in this translation unit.
1228 llvm::MapVector<NamedDecl *, SourceLocation> UndefinedButUsed;
1229
1230 /// Determine if VD, which must be a variable or function, is an external
1231 /// symbol that nonetheless can't be referenced from outside this translation
1232 /// unit because its type has no linkage and it's not extern "C".
1233 bool isExternalWithNoLinkageType(ValueDecl *VD);
1234
1235 /// Obtain a sorted list of functions that are undefined but ODR-used.
1236 void getUndefinedButUsed(
1237 SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined);
1238
1239 /// Retrieves list of suspicious delete-expressions that will be checked at
1240 /// the end of translation unit.
1241 const llvm::MapVector<FieldDecl *, DeleteLocs> &
1242 getMismatchingDeleteExpressions() const;
1243
1244 typedef std::pair<ObjCMethodList, ObjCMethodList> GlobalMethods;
1245 typedef llvm::DenseMap<Selector, GlobalMethods> GlobalMethodPool;
1246
1247 /// Method Pool - allows efficient lookup when typechecking messages to "id".
1248 /// We need to maintain a list, since selectors can have differing signatures
1249 /// across classes. In Cocoa, this happens to be extremely uncommon (only 1%
1250 /// of selectors are "overloaded").
1251 /// At the head of the list it is recorded whether there were 0, 1, or >= 2
1252 /// methods inside categories with a particular selector.
1253 GlobalMethodPool MethodPool;
1254
1255 /// Method selectors used in a \@selector expression. Used for implementation
1256 /// of -Wselector.
1257 llvm::MapVector<Selector, SourceLocation> ReferencedSelectors;
1258
1259 /// List of SourceLocations where 'self' is implicitly retained inside a
1260 /// block.
1261 llvm::SmallVector<std::pair<SourceLocation, const BlockDecl *>, 1>
1262 ImplicitlyRetainedSelfLocs;
1263
1264 /// Kinds of C++ special members.
1265 enum CXXSpecialMember {
1266 CXXDefaultConstructor,
1267 CXXCopyConstructor,
1268 CXXMoveConstructor,
1269 CXXCopyAssignment,
1270 CXXMoveAssignment,
1271 CXXDestructor,
1272 CXXInvalid
1273 };
1274
1275 typedef llvm::PointerIntPair<CXXRecordDecl *, 3, CXXSpecialMember>
1276 SpecialMemberDecl;
1277
1278 /// The C++ special members which we are currently in the process of
1279 /// declaring. If this process recursively triggers the declaration of the
1280 /// same special member, we should act as if it is not yet declared.
1281 llvm::SmallPtrSet<SpecialMemberDecl, 4> SpecialMembersBeingDeclared;
1282
1283 /// Kinds of defaulted comparison operator functions.
1284 enum class DefaultedComparisonKind : unsigned char {
1285 /// This is not a defaultable comparison operator.
1286 None,
1287 /// This is an operator== that should be implemented as a series of
1288 /// subobject comparisons.
1289 Equal,
1290 /// This is an operator<=> that should be implemented as a series of
1291 /// subobject comparisons.
1292 ThreeWay,
1293 /// This is an operator!= that should be implemented as a rewrite in terms
1294 /// of a == comparison.
1295 NotEqual,
1296 /// This is an <, <=, >, or >= that should be implemented as a rewrite in
1297 /// terms of a <=> comparison.
1298 Relational,
1299 };
1300
1301 /// The function definitions which were renamed as part of typo-correction
1302 /// to match their respective declarations. We want to keep track of them
1303 /// to ensure that we don't emit a "redefinition" error if we encounter a
1304 /// correctly named definition after the renamed definition.
1305 llvm::SmallPtrSet<const NamedDecl *, 4> TypoCorrectedFunctionDefinitions;
1306
1307 /// Stack of types that correspond to the parameter entities that are
1308 /// currently being copy-initialized. Can be empty.
1309 llvm::SmallVector<QualType, 4> CurrentParameterCopyTypes;
1310
1311 void ReadMethodPool(Selector Sel);
1312 void updateOutOfDateSelector(Selector Sel);
1313
1314 /// Private Helper predicate to check for 'self'.
1315 bool isSelfExpr(Expr *RExpr);
1316 bool isSelfExpr(Expr *RExpr, const ObjCMethodDecl *Method);
1317
1318 /// Cause the active diagnostic on the DiagosticsEngine to be
1319 /// emitted. This is closely coupled to the SemaDiagnosticBuilder class and
1320 /// should not be used elsewhere.
1321 void EmitCurrentDiagnostic(unsigned DiagID);
1322
1323 /// Records and restores the FPFeatures state on entry/exit of compound
1324 /// statements.
1325 class FPFeaturesStateRAII {
1326 public:
1327 FPFeaturesStateRAII(Sema &S) : S(S), OldFPFeaturesState(S.FPFeatures) {}
1328 ~FPFeaturesStateRAII() { S.FPFeatures = OldFPFeaturesState; }
1329
1330 private:
1331 Sema& S;
1332 FPOptions OldFPFeaturesState;
1333 };
1334
1335 void addImplicitTypedef(StringRef Name, QualType T);
1336
1337 bool WarnedStackExhausted = false;
1338
1339public:
1340 Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
1341 TranslationUnitKind TUKind = TU_Complete,
1342 CodeCompleteConsumer *CompletionConsumer = nullptr);
1343 ~Sema();
1344
1345 /// Perform initialization that occurs after the parser has been
1346 /// initialized but before it parses anything.
1347 void Initialize();
1348
1349 const LangOptions &getLangOpts() const { return LangOpts; }
1350 OpenCLOptions &getOpenCLOptions() { return OpenCLFeatures; }
1351 FPOptions &getFPOptions() { return FPFeatures; }
1352
1353 DiagnosticsEngine &getDiagnostics() const { return Diags; }
1354 SourceManager &getSourceManager() const { return SourceMgr; }
1355 Preprocessor &getPreprocessor() const { return PP; }
1356 ASTContext &getASTContext() const { return Context; }
1357 ASTConsumer &getASTConsumer() const { return Consumer; }
1358 ASTMutationListener *getASTMutationListener() const;
1359 ExternalSemaSource* getExternalSource() const { return ExternalSource; }
1360
1361 ///Registers an external source. If an external source already exists,
1362 /// creates a multiplex external source and appends to it.
1363 ///
1364 ///\param[in] E - A non-null external sema source.
1365 ///
1366 void addExternalSource(ExternalSemaSource *E);
1367
1368 void PrintStats() const;
1369
1370 /// Warn that the stack is nearly exhausted.
1371 void warnStackExhausted(SourceLocation Loc);
1372
1373 /// Run some code with "sufficient" stack space. (Currently, at least 256K is
1374 /// guaranteed). Produces a warning if we're low on stack space and allocates
1375 /// more in that case. Use this in code that may recurse deeply (for example,
1376 /// in template instantiation) to avoid stack overflow.
1377 void runWithSufficientStackSpace(SourceLocation Loc,
1378 llvm::function_ref<void()> Fn);
1379
1380 /// Helper class that creates diagnostics with optional
1381 /// template instantiation stacks.
1382 ///
1383 /// This class provides a wrapper around the basic DiagnosticBuilder
1384 /// class that emits diagnostics. SemaDiagnosticBuilder is
1385 /// responsible for emitting the diagnostic (as DiagnosticBuilder
1386 /// does) and, if the diagnostic comes from inside a template
1387 /// instantiation, printing the template instantiation stack as
1388 /// well.
1389 class SemaDiagnosticBuilder : public DiagnosticBuilder {
1390 Sema &SemaRef;
1391 unsigned DiagID;
1392
1393 public:
1394 SemaDiagnosticBuilder(DiagnosticBuilder &DB, Sema &SemaRef, unsigned DiagID)
1395 : DiagnosticBuilder(DB), SemaRef(SemaRef), DiagID(DiagID) { }
1396
1397 // This is a cunning lie. DiagnosticBuilder actually performs move
1398 // construction in its copy constructor (but due to varied uses, it's not
1399 // possible to conveniently express this as actual move construction). So
1400 // the default copy ctor here is fine, because the base class disables the
1401 // source anyway, so the user-defined ~SemaDiagnosticBuilder is a safe no-op
1402 // in that case anwyay.
1403 SemaDiagnosticBuilder(const SemaDiagnosticBuilder&) = default;
1404
1405 ~SemaDiagnosticBuilder() {
1406 // If we aren't active, there is nothing to do.
1407 if (!isActive()) return;
1408
1409 // Otherwise, we need to emit the diagnostic. First flush the underlying
1410 // DiagnosticBuilder data, and clear the diagnostic builder itself so it
1411 // won't emit the diagnostic in its own destructor.
1412 //
1413 // This seems wasteful, in that as written the DiagnosticBuilder dtor will
1414 // do its own needless checks to see if the diagnostic needs to be
1415 // emitted. However, because we take care to ensure that the builder
1416 // objects never escape, a sufficiently smart compiler will be able to
1417 // eliminate that code.
1418 FlushCounts();
1419 Clear();
1420
1421 // Dispatch to Sema to emit the diagnostic.
1422 SemaRef.EmitCurrentDiagnostic(DiagID);
1423 }
1424
1425 /// Teach operator<< to produce an object of the correct type.
1426 template<typename T>
1427 friend const SemaDiagnosticBuilder &operator<<(
1428 const SemaDiagnosticBuilder &Diag, const T &Value) {
1429 const DiagnosticBuilder &BaseDiag = Diag;
1430 BaseDiag << Value;
1431 return Diag;
1432 }
1433 };
1434
1435 /// Emit a diagnostic.
1436 SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID) {
1437 DiagnosticBuilder DB = Diags.Report(Loc, DiagID);
1438 return SemaDiagnosticBuilder(DB, *this, DiagID);
1439 }
1440
1441 /// Emit a partial diagnostic.
1442 SemaDiagnosticBuilder Diag(SourceLocation Loc, const PartialDiagnostic& PD);
1443
1444 /// Build a partial diagnostic.
1445 PartialDiagnostic PDiag(unsigned DiagID = 0); // in SemaInternal.h
1446
1447 bool findMacroSpelling(SourceLocation &loc, StringRef name);
1448
1449 /// Get a string to suggest for zero-initialization of a type.
1450 std::string
1451 getFixItZeroInitializerForType(QualType T, SourceLocation Loc) const;
1452 std::string getFixItZeroLiteralForType(QualType T, SourceLocation Loc) const;
1453
1454 /// Calls \c Lexer::getLocForEndOfToken()
1455 SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset = 0);
1456
1457 /// Retrieve the module loader associated with the preprocessor.
1458 ModuleLoader &getModuleLoader() const;
1459
1460 /// Invent a new identifier for parameters of abbreviated templates.
1461 IdentifierInfo *
1462 InventAbbreviatedTemplateParameterTypeName(IdentifierInfo *ParamName,
1463 unsigned Index);
1464
1465 void emitAndClearUnusedLocalTypedefWarnings();
1466
1467 enum TUFragmentKind {
1468 /// The global module fragment, between 'module;' and a module-declaration.
1469 Global,
1470 /// A normal translation unit fragment. For a non-module unit, this is the
1471 /// entire translation unit. Otherwise, it runs from the module-declaration
1472 /// to the private-module-fragment (if any) or the end of the TU (if not).
1473 Normal,
1474 /// The private module fragment, between 'module :private;' and the end of
1475 /// the translation unit.
1476 Private
1477 };
1478
1479 void ActOnStartOfTranslationUnit();
1480 void ActOnEndOfTranslationUnit();
1481 void ActOnEndOfTranslationUnitFragment(TUFragmentKind Kind);
1482
1483 void CheckDelegatingCtorCycles();
1484
1485 Scope *getScopeForContext(DeclContext *Ctx);
1486
1487 void PushFunctionScope();
1488 void PushBlockScope(Scope *BlockScope, BlockDecl *Block);
1489 sema::LambdaScopeInfo *PushLambdaScope();
1490
1491 /// This is used to inform Sema what the current TemplateParameterDepth
1492 /// is during Parsing. Currently it is used to pass on the depth
1493 /// when parsing generic lambda 'auto' parameters.
1494 void RecordParsingTemplateParameterDepth(unsigned Depth);
1495
1496 void PushCapturedRegionScope(Scope *RegionScope, CapturedDecl *CD,
1497 RecordDecl *RD, CapturedRegionKind K,
1498 unsigned OpenMPCaptureLevel = 0);
1499
1500 /// Custom deleter to allow FunctionScopeInfos to be kept alive for a short
1501 /// time after they've been popped.
1502 class PoppedFunctionScopeDeleter {
1503 Sema *Self;
1504
1505 public:
1506 explicit PoppedFunctionScopeDeleter(Sema *Self) : Self(Self) {}
1507 void operator()(sema::FunctionScopeInfo *Scope) const;
1508 };
1509
1510 using PoppedFunctionScopePtr =
1511 std::unique_ptr<sema::FunctionScopeInfo, PoppedFunctionScopeDeleter>;
1512
1513 PoppedFunctionScopePtr
1514 PopFunctionScopeInfo(const sema::AnalysisBasedWarnings::Policy *WP = nullptr,
1515 const Decl *D = nullptr,
1516 QualType BlockType = QualType());
1517
1518 sema::FunctionScopeInfo *getCurFunction() const {
1519 return FunctionScopes.empty() ? nullptr : FunctionScopes.back();
1520 }
1521
1522 sema::FunctionScopeInfo *getEnclosingFunction() const;
1523
1524 void setFunctionHasBranchIntoScope();
1525 void setFunctionHasBranchProtectedScope();
1526 void setFunctionHasIndirectGoto();
1527
1528 void PushCompoundScope(bool IsStmtExpr);
1529 void PopCompoundScope();
1530
1531 sema::CompoundScopeInfo &getCurCompoundScope() const;
1532
1533 bool hasAnyUnrecoverableErrorsInThisFunction() const;
1534
1535 /// Retrieve the current block, if any.
1536 sema::BlockScopeInfo *getCurBlock();
1537
1538 /// Get the innermost lambda enclosing the current location, if any. This
1539 /// looks through intervening non-lambda scopes such as local functions and
1540 /// blocks.
1541 sema::LambdaScopeInfo *getEnclosingLambda() const;
1542
1543 /// Retrieve the current lambda scope info, if any.
1544 /// \param IgnoreNonLambdaCapturingScope true if should find the top-most
1545 /// lambda scope info ignoring all inner capturing scopes that are not
1546 /// lambda scopes.
1547 sema::LambdaScopeInfo *
1548 getCurLambda(bool IgnoreNonLambdaCapturingScope = false);
1549
1550 /// Retrieve the current generic lambda info, if any.
1551 sema::LambdaScopeInfo *getCurGenericLambda();
1552
1553 /// Retrieve the current captured region, if any.
1554 sema::CapturedRegionScopeInfo *getCurCapturedRegion();
1555
1556 /// WeakTopLevelDeclDecls - access to \#pragma weak-generated Decls
1557 SmallVectorImpl<Decl *> &WeakTopLevelDecls() { return WeakTopLevelDecl; }
1558
1559 /// Called before parsing a function declarator belonging to a function
1560 /// declaration.
1561 void ActOnStartFunctionDeclarationDeclarator(Declarator &D,
1562 unsigned TemplateParameterDepth);
1563
1564 /// Called after parsing a function declarator belonging to a function
1565 /// declaration.
1566 void ActOnFinishFunctionDeclarationDeclarator(Declarator &D);
1567
1568 void ActOnComment(SourceRange Comment);
1569
1570 //===--------------------------------------------------------------------===//
1571 // Type Analysis / Processing: SemaType.cpp.
1572 //
1573
1574 QualType BuildQualifiedType(QualType T, SourceLocation Loc, Qualifiers Qs,
1575 const DeclSpec *DS = nullptr);
1576 QualType BuildQualifiedType(QualType T, SourceLocation Loc, unsigned CVRA,
1577 const DeclSpec *DS = nullptr);
1578 QualType BuildPointerType(QualType T,
1579 SourceLocation Loc, DeclarationName Entity);
1580 QualType BuildReferenceType(QualType T, bool LValueRef,
1581 SourceLocation Loc, DeclarationName Entity);
1582 QualType BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
1583 Expr *ArraySize, unsigned Quals,
1584 SourceRange Brackets, DeclarationName Entity);
1585 QualType BuildVectorType(QualType T, Expr *VecSize, SourceLocation AttrLoc);
1586 QualType BuildExtVectorType(QualType T, Expr *ArraySize,
1587 SourceLocation AttrLoc);
1588 QualType BuildAddressSpaceAttr(QualType &T, LangAS ASIdx, Expr *AddrSpace,
1589 SourceLocation AttrLoc);
1590
1591 /// Same as above, but constructs the AddressSpace index if not provided.
1592 QualType BuildAddressSpaceAttr(QualType &T, Expr *AddrSpace,
1593 SourceLocation AttrLoc);
1594
1595 bool CheckQualifiedFunctionForTypeId(QualType T, SourceLocation Loc);
1596
1597 bool CheckFunctionReturnType(QualType T, SourceLocation Loc);
1598
1599 /// Build a function type.
1600 ///
1601 /// This routine checks the function type according to C++ rules and
1602 /// under the assumption that the result type and parameter types have
1603 /// just been instantiated from a template. It therefore duplicates
1604 /// some of the behavior of GetTypeForDeclarator, but in a much
1605 /// simpler form that is only suitable for this narrow use case.
1606 ///
1607 /// \param T The return type of the function.
1608 ///
1609 /// \param ParamTypes The parameter types of the function. This array
1610 /// will be modified to account for adjustments to the types of the
1611 /// function parameters.
1612 ///
1613 /// \param Loc The location of the entity whose type involves this
1614 /// function type or, if there is no such entity, the location of the
1615 /// type that will have function type.
1616 ///
1617 /// \param Entity The name of the entity that involves the function
1618 /// type, if known.
1619 ///
1620 /// \param EPI Extra information about the function type. Usually this will
1621 /// be taken from an existing function with the same prototype.
1622 ///
1623 /// \returns A suitable function type, if there are no errors. The
1624 /// unqualified type will always be a FunctionProtoType.
1625 /// Otherwise, returns a NULL type.
1626 QualType BuildFunctionType(QualType T,
1627 MutableArrayRef<QualType> ParamTypes,
1628 SourceLocation Loc, DeclarationName Entity,
1629 const FunctionProtoType::ExtProtoInfo &EPI);
1630
1631 QualType BuildMemberPointerType(QualType T, QualType Class,
1632 SourceLocation Loc,
1633 DeclarationName Entity);
1634 QualType BuildBlockPointerType(QualType T,
1635 SourceLocation Loc, DeclarationName Entity);
1636 QualType BuildParenType(QualType T);
1637 QualType BuildAtomicType(QualType T, SourceLocation Loc);
1638 QualType BuildReadPipeType(QualType T,
1639 SourceLocation Loc);
1640 QualType BuildWritePipeType(QualType T,
1641 SourceLocation Loc);
1642
1643 TypeSourceInfo *GetTypeForDeclarator(Declarator &D, Scope *S);
1644 TypeSourceInfo *GetTypeForDeclaratorCast(Declarator &D, QualType FromTy);
1645
1646 /// Package the given type and TSI into a ParsedType.
1647 ParsedType CreateParsedType(QualType T, TypeSourceInfo *TInfo);
1648 DeclarationNameInfo GetNameForDeclarator(Declarator &D);
1649 DeclarationNameInfo GetNameFromUnqualifiedId(const UnqualifiedId &Name);
1650 static QualType GetTypeFromParser(ParsedType Ty,
1651 TypeSourceInfo **TInfo = nullptr);
1652 CanThrowResult canThrow(const Stmt *E);
1653 const FunctionProtoType *ResolveExceptionSpec(SourceLocation Loc,
1654 const FunctionProtoType *FPT);
1655 void UpdateExceptionSpec(FunctionDecl *FD,
1656 const FunctionProtoType::ExceptionSpecInfo &ESI);
1657 bool CheckSpecifiedExceptionType(QualType &T, SourceRange Range);
1658 bool CheckDistantExceptionSpec(QualType T);
1659 bool CheckEquivalentExceptionSpec(FunctionDecl *Old, FunctionDecl *New);
1660 bool CheckEquivalentExceptionSpec(
1661 const FunctionProtoType *Old, SourceLocation OldLoc,
1662 const FunctionProtoType *New, SourceLocation NewLoc);
1663 bool CheckEquivalentExceptionSpec(
1664 const PartialDiagnostic &DiagID, const PartialDiagnostic & NoteID,
1665 const FunctionProtoType *Old, SourceLocation OldLoc,
1666 const FunctionProtoType *New, SourceLocation NewLoc);
1667 bool handlerCanCatch(QualType HandlerType, QualType ExceptionType);
1668 bool CheckExceptionSpecSubset(const PartialDiagnostic &DiagID,
1669 const PartialDiagnostic &NestedDiagID,
1670 const PartialDiagnostic &NoteID,
1671 const PartialDiagnostic &NoThrowDiagID,
1672 const FunctionProtoType *Superset,
1673 SourceLocation SuperLoc,
1674 const FunctionProtoType *Subset,
1675 SourceLocation SubLoc);
1676 bool CheckParamExceptionSpec(const PartialDiagnostic &NestedDiagID,
1677 const PartialDiagnostic &NoteID,
1678 const FunctionProtoType *Target,
1679 SourceLocation TargetLoc,
1680 const FunctionProtoType *Source,
1681 SourceLocation SourceLoc);
1682
1683 TypeResult ActOnTypeName(Scope *S, Declarator &D);
1684
1685 /// The parser has parsed the context-sensitive type 'instancetype'
1686 /// in an Objective-C message declaration. Return the appropriate type.
1687 ParsedType ActOnObjCInstanceType(SourceLocation Loc);
1688
1689 /// Abstract class used to diagnose incomplete types.
1690 struct TypeDiagnoser {
1691 TypeDiagnoser() {}
1692
1693 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) = 0;
1694 virtual ~TypeDiagnoser() {}
1695 };
1696
1697 static int getPrintable(int I) { return I; }
1698 static unsigned getPrintable(unsigned I) { return I; }
1699 static bool getPrintable(bool B) { return B; }
1700 static const char * getPrintable(const char *S) { return S; }
1701 static StringRef getPrintable(StringRef S) { return S; }
1702 static const std::string &getPrintable(const std::string &S) { return S; }
1703 static const IdentifierInfo *getPrintable(const IdentifierInfo *II) {
1704 return II;
1705 }
1706 static DeclarationName getPrintable(DeclarationName N) { return N; }
1707 static QualType getPrintable(QualType T) { return T; }
1708 static SourceRange getPrintable(SourceRange R) { return R; }
1709 static SourceRange getPrintable(SourceLocation L) { return L; }
1710 static SourceRange getPrintable(const Expr *E) { return E->getSourceRange(); }
1711 static SourceRange getPrintable(TypeLoc TL) { return TL.getSourceRange();}
1712
1713 template <typename... Ts> class BoundTypeDiagnoser : public TypeDiagnoser {
1714 unsigned DiagID;
1715 std::tuple<const Ts &...> Args;
1716
1717 template <std::size_t... Is>
1718 void emit(const SemaDiagnosticBuilder &DB,
1719 std::index_sequence<Is...>) const {
1720 // Apply all tuple elements to the builder in order.
1721 bool Dummy[] = {false, (DB << getPrintable(std::get<Is>(Args)))...};
1722 (void)Dummy;
1723 }
1724
1725 public:
1726 BoundTypeDiagnoser(unsigned DiagID, const Ts &...Args)
1727 : TypeDiagnoser(), DiagID(DiagID), Args(Args...) {
1728 assert(DiagID != 0 && "no diagnostic for type diagnoser")((DiagID != 0 && "no diagnostic for type diagnoser") ?
static_cast<void> (0) : __assert_fail ("DiagID != 0 && \"no diagnostic for type diagnoser\""
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/Sema/Sema.h"
, 1728, __PRETTY_FUNCTION__))
;
1729 }
1730
1731 void diagnose(Sema &S, SourceLocation Loc, QualType T) override {
1732 const SemaDiagnosticBuilder &DB = S.Diag(Loc, DiagID);
1733 emit(DB, std::index_sequence_for<Ts...>());
1734 DB << T;
1735 }
1736 };
1737
1738private:
1739 /// Methods for marking which expressions involve dereferencing a pointer
1740 /// marked with the 'noderef' attribute. Expressions are checked bottom up as
1741 /// they are parsed, meaning that a noderef pointer may not be accessed. For
1742 /// example, in `&*p` where `p` is a noderef pointer, we will first parse the
1743 /// `*p`, but need to check that `address of` is called on it. This requires
1744 /// keeping a container of all pending expressions and checking if the address
1745 /// of them are eventually taken.
1746 void CheckSubscriptAccessOfNoDeref(const ArraySubscriptExpr *E);
1747 void CheckAddressOfNoDeref(const Expr *E);
1748 void CheckMemberAccessOfNoDeref(const MemberExpr *E);
1749
1750 bool RequireCompleteTypeImpl(SourceLocation Loc, QualType T,
1751 TypeDiagnoser *Diagnoser);
1752
1753 struct ModuleScope {
1754 SourceLocation BeginLoc;
1755 clang::Module *Module = nullptr;
1756 bool ModuleInterface = false;
1757 bool ImplicitGlobalModuleFragment = false;
1758 VisibleModuleSet OuterVisibleModules;
1759 };
1760 /// The modules we're currently parsing.
1761 llvm::SmallVector<ModuleScope, 16> ModuleScopes;
1762
1763 /// Namespace definitions that we will export when they finish.
1764 llvm::SmallPtrSet<const NamespaceDecl*, 8> DeferredExportedNamespaces;
1765
1766 /// Get the module whose scope we are currently within.
1767 Module *getCurrentModule() const {
1768 return ModuleScopes.empty() ? nullptr : ModuleScopes.back().Module;
1769 }
1770
1771 VisibleModuleSet VisibleModules;
1772
1773public:
1774 /// Get the module owning an entity.
1775 Module *getOwningModule(const Decl *Entity) {
1776 return Entity->getOwningModule();
1777 }
1778
1779 /// Make a merged definition of an existing hidden definition \p ND
1780 /// visible at the specified location.
1781 void makeMergedDefinitionVisible(NamedDecl *ND);
1782
1783 bool isModuleVisible(const Module *M, bool ModulePrivate = false);
1784
1785 /// Determine whether a declaration is visible to name lookup.
1786 bool isVisible(const NamedDecl *D) {
1787 return !D->isHidden() || isVisibleSlow(D);
1788 }
1789
1790 /// Determine whether any declaration of an entity is visible.
1791 bool
1792 hasVisibleDeclaration(const NamedDecl *D,
1793 llvm::SmallVectorImpl<Module *> *Modules = nullptr) {
1794 return isVisible(D) || hasVisibleDeclarationSlow(D, Modules);
1795 }
1796 bool hasVisibleDeclarationSlow(const NamedDecl *D,
1797 llvm::SmallVectorImpl<Module *> *Modules);
1798
1799 bool hasVisibleMergedDefinition(NamedDecl *Def);
1800 bool hasMergedDefinitionInCurrentModule(NamedDecl *Def);
1801
1802 /// Determine if \p D and \p Suggested have a structurally compatible
1803 /// layout as described in C11 6.2.7/1.
1804 bool hasStructuralCompatLayout(Decl *D, Decl *Suggested);
1805
1806 /// Determine if \p D has a visible definition. If not, suggest a declaration
1807 /// that should be made visible to expose the definition.
1808 bool hasVisibleDefinition(NamedDecl *D, NamedDecl **Suggested,
1809 bool OnlyNeedComplete = false);
1810 bool hasVisibleDefinition(const NamedDecl *D) {
1811 NamedDecl *Hidden;
1812 return hasVisibleDefinition(const_cast<NamedDecl*>(D), &Hidden);
1813 }
1814
1815 /// Determine if the template parameter \p D has a visible default argument.
1816 bool
1817 hasVisibleDefaultArgument(const NamedDecl *D,
1818 llvm::SmallVectorImpl<Module *> *Modules = nullptr);
1819
1820 /// Determine if there is a visible declaration of \p D that is an explicit
1821 /// specialization declaration for a specialization of a template. (For a
1822 /// member specialization, use hasVisibleMemberSpecialization.)
1823 bool hasVisibleExplicitSpecialization(
1824 const NamedDecl *D, llvm::SmallVectorImpl<Module *> *Modules = nullptr);
1825
1826 /// Determine if there is a visible declaration of \p D that is a member
1827 /// specialization declaration (as opposed to an instantiated declaration).
1828 bool hasVisibleMemberSpecialization(
1829 const NamedDecl *D, llvm::SmallVectorImpl<Module *> *Modules = nullptr);
1830
1831 /// Determine if \p A and \p B are equivalent internal linkage declarations
1832 /// from different modules, and thus an ambiguity error can be downgraded to
1833 /// an extension warning.
1834 bool isEquivalentInternalLinkageDeclaration(const NamedDecl *A,
1835 const NamedDecl *B);
1836 void diagnoseEquivalentInternalLinkageDeclarations(
1837 SourceLocation Loc, const NamedDecl *D,
1838 ArrayRef<const NamedDecl *> Equiv);
1839
1840 bool isUsualDeallocationFunction(const CXXMethodDecl *FD);
1841
1842 bool isCompleteType(SourceLocation Loc, QualType T) {
1843 return !RequireCompleteTypeImpl(Loc, T, nullptr);
1844 }
1845 bool RequireCompleteType(SourceLocation Loc, QualType T,
1846 TypeDiagnoser &Diagnoser);
1847 bool RequireCompleteType(SourceLocation Loc, QualType T,
1848 unsigned DiagID);
1849
1850 template <typename... Ts>
1851 bool RequireCompleteType(SourceLocation Loc, QualType T, unsigned DiagID,
1852 const Ts &...Args) {
1853 BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
1854 return RequireCompleteType(Loc, T, Diagnoser);
1855 }
1856
1857 void completeExprArrayBound(Expr *E);
1858 bool RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser);
1859 bool RequireCompleteExprType(Expr *E, unsigned DiagID);
1860
1861 template <typename... Ts>
1862 bool RequireCompleteExprType(Expr *E, unsigned DiagID, const Ts &...Args) {
1863 BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
1864 return RequireCompleteExprType(E, Diagnoser);
1865 }
1866
1867 bool RequireLiteralType(SourceLocation Loc, QualType T,
1868 TypeDiagnoser &Diagnoser);
1869 bool RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID);
1870
1871 template <typename... Ts>
1872 bool RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID,
1873 const Ts &...Args) {
1874 BoundTypeDiagnoser<Ts...> Diagnoser(DiagID, Args...);
1875 return RequireLiteralType(Loc, T, Diagnoser);
1876 }
1877
1878 QualType getElaboratedType(ElaboratedTypeKeyword Keyword,
1879 const CXXScopeSpec &SS, QualType T,
1880 TagDecl *OwnedTagDecl = nullptr);
1881
1882 QualType BuildTypeofExprType(Expr *E, SourceLocation Loc);
1883 /// If AsUnevaluated is false, E is treated as though it were an evaluated
1884 /// context, such as when building a type for decltype(auto).
1885 QualType BuildDecltypeType(Expr *E, SourceLocation Loc,
1886 bool AsUnevaluated = true);
1887 QualType BuildUnaryTransformType(QualType BaseType,
1888 UnaryTransformType::UTTKind UKind,
1889 SourceLocation Loc);
1890
1891 //===--------------------------------------------------------------------===//
1892 // Symbol table / Decl tracking callbacks: SemaDecl.cpp.
1893 //
1894
1895 struct SkipBodyInfo {
1896 SkipBodyInfo()
1897 : ShouldSkip(false), CheckSameAsPrevious(false), Previous(nullptr),
1898 New(nullptr) {}
1899 bool ShouldSkip;
1900 bool CheckSameAsPrevious;
1901 NamedDecl *Previous;
1902 NamedDecl *New;
1903 };
1904
1905 DeclGroupPtrTy ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType = nullptr);
1906
1907 void DiagnoseUseOfUnimplementedSelectors();
1908
1909 bool isSimpleTypeSpecifier(tok::TokenKind Kind) const;
1910
1911 ParsedType getTypeName(const IdentifierInfo &II, SourceLocation NameLoc,
1912 Scope *S, CXXScopeSpec *SS = nullptr,
1913 bool isClassName = false, bool HasTrailingDot = false,
1914 ParsedType ObjectType = nullptr,
1915 bool IsCtorOrDtorName = false,
1916 bool WantNontrivialTypeSourceInfo = false,
1917 bool IsClassTemplateDeductionContext = true,
1918 IdentifierInfo **CorrectedII = nullptr);
1919 TypeSpecifierType isTagName(IdentifierInfo &II, Scope *S);
1920 bool isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S);
1921 void DiagnoseUnknownTypeName(IdentifierInfo *&II,
1922 SourceLocation IILoc,
1923 Scope *S,
1924 CXXScopeSpec *SS,
1925 ParsedType &SuggestedType,
1926 bool IsTemplateName = false);
1927
1928 /// Attempt to behave like MSVC in situations where lookup of an unqualified
1929 /// type name has failed in a dependent context. In these situations, we
1930 /// automatically form a DependentTypeName that will retry lookup in a related
1931 /// scope during instantiation.
1932 ParsedType ActOnMSVCUnknownTypeName(const IdentifierInfo &II,
1933 SourceLocation NameLoc,
1934 bool IsTemplateTypeArg);
1935
1936 /// Describes the result of the name lookup and resolution performed
1937 /// by \c ClassifyName().
1938 enum NameClassificationKind {
1939 /// This name is not a type or template in this context, but might be
1940 /// something else.
1941 NC_Unknown,
1942 /// Classification failed; an error has been produced.
1943 NC_Error,
1944 /// The name has been typo-corrected to a keyword.
1945 NC_Keyword,
1946 /// The name was classified as a type.
1947 NC_Type,
1948 /// The name was classified as a specific non-type, non-template
1949 /// declaration. ActOnNameClassifiedAsNonType should be called to
1950 /// convert the declaration to an expression.
1951 NC_NonType,
1952 /// The name was classified as an ADL-only function name.
1953 /// ActOnNameClassifiedAsUndeclaredNonType should be called to convert the
1954 /// result to an expression.
1955 NC_UndeclaredNonType,
1956 /// The name denotes a member of a dependent type that could not be
1957 /// resolved. ActOnNameClassifiedAsDependentNonType should be called to
1958 /// convert the result to an expression.
1959 NC_DependentNonType,
1960 /// The name was classified as a non-type, and an expression representing
1961 /// that name has been formed.
1962 NC_ContextIndependentExpr,
1963 /// The name was classified as a template whose specializations are types.
1964 NC_TypeTemplate,
1965 /// The name was classified as a variable template name.
1966 NC_VarTemplate,
1967 /// The name was classified as a function template name.
1968 NC_FunctionTemplate,
1969 /// The name was classified as an ADL-only function template name.
1970 NC_UndeclaredTemplate,
1971 /// The name was classified as a concept name.
1972 NC_Concept,
1973 };
1974
1975 class NameClassification {
1976 NameClassificationKind Kind;
1977 union {
1978 ExprResult Expr;
1979 NamedDecl *NonTypeDecl;
1980 TemplateName Template;
1981 ParsedType Type;
1982 };
1983
1984 explicit NameClassification(NameClassificationKind Kind) : Kind(Kind) {}
1985
1986 public:
1987 NameClassification(ParsedType Type) : Kind(NC_Type), Type(Type) {}
1988
1989 NameClassification(const IdentifierInfo *Keyword) : Kind(NC_Keyword) {}
1990
1991 static NameClassification Error() {
1992 return NameClassification(NC_Error);
1993 }
1994
1995 static NameClassification Unknown() {
1996 return NameClassification(NC_Unknown);
1997 }
1998
1999 static NameClassification ContextIndependentExpr(ExprResult E) {
2000 NameClassification Result(NC_ContextIndependentExpr);
2001 Result.Expr = E;
2002 return Result;
2003 }
2004
2005 static NameClassification NonType(NamedDecl *D) {
2006 NameClassification Result(NC_NonType);
2007 Result.NonTypeDecl = D;
2008 return Result;
2009 }
2010
2011 static NameClassification UndeclaredNonType() {
2012 return NameClassification(NC_UndeclaredNonType);
2013 }
2014
2015 static NameClassification DependentNonType() {
2016 return NameClassification(NC_DependentNonType);
2017 }
2018
2019 static NameClassification TypeTemplate(TemplateName Name) {
2020 NameClassification Result(NC_TypeTemplate);
2021 Result.Template = Name;
2022 return Result;
2023 }
2024
2025 static NameClassification VarTemplate(TemplateName Name) {
2026 NameClassification Result(NC_VarTemplate);
2027 Result.Template = Name;
2028 return Result;
2029 }
2030
2031 static NameClassification FunctionTemplate(TemplateName Name) {
2032 NameClassification Result(NC_FunctionTemplate);
2033 Result.Template = Name;
2034 return Result;
2035 }
2036
2037 static NameClassification Concept(TemplateName Name) {
2038 NameClassification Result(NC_Concept);
2039 Result.Template = Name;
2040 return Result;
2041 }
2042
2043 static NameClassification UndeclaredTemplate(TemplateName Name) {
2044 NameClassification Result(NC_UndeclaredTemplate);
2045 Result.Template = Name;
2046 return Result;
2047 }
2048
2049 NameClassificationKind getKind() const { return Kind; }
2050
2051 ExprResult getExpression() const {
2052 assert(Kind == NC_ContextIndependentExpr)((Kind == NC_ContextIndependentExpr) ? static_cast<void>
(0) : __assert_fail ("Kind == NC_ContextIndependentExpr", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/Sema/Sema.h"
, 2052, __PRETTY_FUNCTION__))
;
2053 return Expr;
2054 }
2055
2056 ParsedType getType() const {
2057 assert(Kind == NC_Type)((Kind == NC_Type) ? static_cast<void> (0) : __assert_fail
("Kind == NC_Type", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/Sema/Sema.h"
, 2057, __PRETTY_FUNCTION__))
;
2058 return Type;
2059 }
2060
2061 NamedDecl *getNonTypeDecl() const {
2062 assert(Kind == NC_NonType)((Kind == NC_NonType) ? static_cast<void> (0) : __assert_fail
("Kind == NC_NonType", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/Sema/Sema.h"
, 2062, __PRETTY_FUNCTION__))
;
2063 return NonTypeDecl;
2064 }
2065
2066 TemplateName getTemplateName() const {
2067 assert(Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate ||((Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate || Kind
== NC_VarTemplate || Kind == NC_Concept || Kind == NC_UndeclaredTemplate
) ? static_cast<void> (0) : __assert_fail ("Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate || Kind == NC_VarTemplate || Kind == NC_Concept || Kind == NC_UndeclaredTemplate"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/Sema/Sema.h"
, 2069, __PRETTY_FUNCTION__))
2068 Kind == NC_VarTemplate || Kind == NC_Concept ||((Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate || Kind
== NC_VarTemplate || Kind == NC_Concept || Kind == NC_UndeclaredTemplate
) ? static_cast<void> (0) : __assert_fail ("Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate || Kind == NC_VarTemplate || Kind == NC_Concept || Kind == NC_UndeclaredTemplate"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/Sema/Sema.h"
, 2069, __PRETTY_FUNCTION__))
2069 Kind == NC_UndeclaredTemplate)((Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate || Kind
== NC_VarTemplate || Kind == NC_Concept || Kind == NC_UndeclaredTemplate
) ? static_cast<void> (0) : __assert_fail ("Kind == NC_TypeTemplate || Kind == NC_FunctionTemplate || Kind == NC_VarTemplate || Kind == NC_Concept || Kind == NC_UndeclaredTemplate"
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/Sema/Sema.h"
, 2069, __PRETTY_FUNCTION__))
;
2070 return Template;
2071 }
2072
2073 TemplateNameKind getTemplateNameKind() const {
2074 switch (Kind) {
2075 case NC_TypeTemplate:
2076 return TNK_Type_template;
2077 case NC_FunctionTemplate:
2078 return TNK_Function_template;
2079 case NC_VarTemplate:
2080 return TNK_Var_template;
2081 case NC_Concept:
2082 return TNK_Concept_template;
2083 case NC_UndeclaredTemplate:
2084 return TNK_Undeclared_template;
2085 default:
2086 llvm_unreachable("unsupported name classification.")::llvm::llvm_unreachable_internal("unsupported name classification."
, "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/Sema/Sema.h"
, 2086)
;
2087 }
2088 }
2089 };
2090
2091 /// Perform name lookup on the given name, classifying it based on
2092 /// the results of name lookup and the following token.
2093 ///
2094 /// This routine is used by the parser to resolve identifiers and help direct
2095 /// parsing. When the identifier cannot be found, this routine will attempt
2096 /// to correct the typo and classify based on the resulting name.
2097 ///
2098 /// \param S The scope in which we're performing name lookup.
2099 ///
2100 /// \param SS The nested-name-specifier that precedes the name.
2101 ///
2102 /// \param Name The identifier. If typo correction finds an alternative name,
2103 /// this pointer parameter will be updated accordingly.
2104 ///
2105 /// \param NameLoc The location of the identifier.
2106 ///
2107 /// \param NextToken The token following the identifier. Used to help
2108 /// disambiguate the name.
2109 ///
2110 /// \param CCC The correction callback, if typo correction is desired.
2111 NameClassification ClassifyName(Scope *S, CXXScopeSpec &SS,
2112 IdentifierInfo *&Name, SourceLocation NameLoc,
2113 const Token &NextToken,
2114 CorrectionCandidateCallback *CCC = nullptr);
2115
2116 /// Act on the result of classifying a name as an undeclared (ADL-only)
2117 /// non-type declaration.
2118 ExprResult ActOnNameClassifiedAsUndeclaredNonType(IdentifierInfo *Name,
2119 SourceLocation NameLoc);
2120 /// Act on the result of classifying a name as an undeclared member of a
2121 /// dependent base class.
2122 ExprResult ActOnNameClassifiedAsDependentNonType(const CXXScopeSpec &SS,
2123 IdentifierInfo *Name,
2124 SourceLocation NameLoc,
2125 bool IsAddressOfOperand);
2126 /// Act on the result of classifying a name as a specific non-type
2127 /// declaration.
2128 ExprResult ActOnNameClassifiedAsNonType(Scope *S, const CXXScopeSpec &SS,
2129 NamedDecl *Found,
2130 SourceLocation NameLoc,
2131 const Token &NextToken);
2132
2133 /// Describes the detailed kind of a template name. Used in diagnostics.
2134 enum class TemplateNameKindForDiagnostics {
2135 ClassTemplate,
2136 FunctionTemplate,
2137 VarTemplate,
2138 AliasT