Bug Summary

File:clang/lib/Sema/SemaTemplateInstantiate.cpp
Warning:line 2793, column 41
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -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 -fhalf-no-semantic-interposition -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -fno-split-dwarf-inlining -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-13/lib/clang/13.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema -I /build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/include -I /build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/build-llvm/include -I /build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/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-13/lib/clang/13.0.0/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-13~++20210223111116+16ede0956cb1/build-llvm/tools/clang/lib/Sema -fdebug-prefix-map=/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1=. -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2021-02-23-121308-24221-1 -x c++ /build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp

/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/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 "TreeTransform.h"
13#include "clang/AST/ASTConsumer.h"
14#include "clang/AST/ASTContext.h"
15#include "clang/AST/ASTLambda.h"
16#include "clang/AST/ASTMutationListener.h"
17#include "clang/AST/DeclTemplate.h"
18#include "clang/AST/Expr.h"
19#include "clang/AST/PrettyDeclStackTrace.h"
20#include "clang/AST/TypeVisitor.h"
21#include "clang/Basic/LangOptions.h"
22#include "clang/Basic/Stack.h"
23#include "clang/Basic/TargetInfo.h"
24#include "clang/Sema/DeclSpec.h"
25#include "clang/Sema/Initialization.h"
26#include "clang/Sema/Lookup.h"
27#include "clang/Sema/SemaConcept.h"
28#include "clang/Sema/SemaInternal.h"
29#include "clang/Sema/Template.h"
30#include "clang/Sema/TemplateDeduction.h"
31#include "clang/Sema/TemplateInstCallback.h"
32#include "llvm/Support/TimeProfiler.h"
33
34using namespace clang;
35using namespace sema;
36
37//===----------------------------------------------------------------------===/
38// Template Instantiation Support
39//===----------------------------------------------------------------------===/
40
41/// Retrieve the template argument list(s) that should be used to
42/// instantiate the definition of the given declaration.
43///
44/// \param D the declaration for which we are computing template instantiation
45/// arguments.
46///
47/// \param Innermost if non-NULL, the innermost template argument list.
48///
49/// \param RelativeToPrimary true if we should get the template
50/// arguments relative to the primary template, even when we're
51/// dealing with a specialization. This is only relevant for function
52/// template specializations.
53///
54/// \param Pattern If non-NULL, indicates the pattern from which we will be
55/// instantiating the definition of the given declaration, \p D. This is
56/// used to determine the proper set of template instantiation arguments for
57/// friend function template specializations.
58MultiLevelTemplateArgumentList
59Sema::getTemplateInstantiationArgs(NamedDecl *D,
60 const TemplateArgumentList *Innermost,
61 bool RelativeToPrimary,
62 const FunctionDecl *Pattern) {
63 // Accumulate the set of template argument lists in this structure.
64 MultiLevelTemplateArgumentList Result;
65
66 if (Innermost)
67 Result.addOuterTemplateArguments(Innermost);
68
69 DeclContext *Ctx = dyn_cast<DeclContext>(D);
70 if (!Ctx) {
71 Ctx = D->getDeclContext();
72
73 // Add template arguments from a variable template instantiation. For a
74 // class-scope explicit specialization, there are no template arguments
75 // at this level, but there may be enclosing template arguments.
76 VarTemplateSpecializationDecl *Spec =
77 dyn_cast<VarTemplateSpecializationDecl>(D);
78 if (Spec && !Spec->isClassScopeExplicitSpecialization()) {
79 // We're done when we hit an explicit specialization.
80 if (Spec->getSpecializationKind() == TSK_ExplicitSpecialization &&
81 !isa<VarTemplatePartialSpecializationDecl>(Spec))
82 return Result;
83
84 Result.addOuterTemplateArguments(&Spec->getTemplateInstantiationArgs());
85
86 // If this variable template specialization was instantiated from a
87 // specialized member that is a variable template, we're done.
88 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 88, __PRETTY_FUNCTION__))
;
89 llvm::PointerUnion<VarTemplateDecl*,
90 VarTemplatePartialSpecializationDecl*> Specialized
91 = Spec->getSpecializedTemplateOrPartial();
92 if (VarTemplatePartialSpecializationDecl *Partial =
93 Specialized.dyn_cast<VarTemplatePartialSpecializationDecl *>()) {
94 if (Partial->isMemberSpecialization())
95 return Result;
96 } else {
97 VarTemplateDecl *Tmpl = Specialized.get<VarTemplateDecl *>();
98 if (Tmpl->isMemberSpecialization())
99 return Result;
100 }
101 }
102
103 // If we have a template template parameter with translation unit context,
104 // then we're performing substitution into a default template argument of
105 // this template template parameter before we've constructed the template
106 // that will own this template template parameter. In this case, we
107 // use empty template parameter lists for all of the outer templates
108 // to avoid performing any substitutions.
109 if (Ctx->isTranslationUnit()) {
110 if (TemplateTemplateParmDecl *TTP
111 = dyn_cast<TemplateTemplateParmDecl>(D)) {
112 for (unsigned I = 0, N = TTP->getDepth() + 1; I != N; ++I)
113 Result.addOuterTemplateArguments(None);
114 return Result;
115 }
116 }
117 }
118
119 while (!Ctx->isFileContext()) {
120 // Add template arguments from a class template instantiation.
121 ClassTemplateSpecializationDecl *Spec
122 = dyn_cast<ClassTemplateSpecializationDecl>(Ctx);
123 if (Spec && !Spec->isClassScopeExplicitSpecialization()) {
124 // We're done when we hit an explicit specialization.
125 if (Spec->getSpecializationKind() == TSK_ExplicitSpecialization &&
126 !isa<ClassTemplatePartialSpecializationDecl>(Spec))
127 break;
128
129 Result.addOuterTemplateArguments(&Spec->getTemplateInstantiationArgs());
130
131 // If this class template specialization was instantiated from a
132 // specialized member that is a class template, we're done.
133 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 133, __PRETTY_FUNCTION__))
;
134 if (Spec->getSpecializedTemplate()->isMemberSpecialization())
135 break;
136 }
137 // Add template arguments from a function template specialization.
138 else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Ctx)) {
139 if (!RelativeToPrimary &&
140 Function->getTemplateSpecializationKindForInstantiation() ==
141 TSK_ExplicitSpecialization)
142 break;
143
144 if (!RelativeToPrimary && Function->getTemplateSpecializationKind() ==
145 TSK_ExplicitSpecialization) {
146 // This is an implicit instantiation of an explicit specialization. We
147 // don't get any template arguments from this function but might get
148 // some from an enclosing template.
149 } else if (const TemplateArgumentList *TemplateArgs
150 = Function->getTemplateSpecializationArgs()) {
151 // Add the template arguments for this specialization.
152 Result.addOuterTemplateArguments(TemplateArgs);
153
154 // If this function was instantiated from a specialized member that is
155 // a function template, we're done.
156 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 156, __PRETTY_FUNCTION__))
;
157 if (Function->getPrimaryTemplate()->isMemberSpecialization())
158 break;
159
160 // If this function is a generic lambda specialization, we are done.
161 if (isGenericLambdaCallOperatorOrStaticInvokerSpecialization(Function))
162 break;
163
164 } else if (FunctionTemplateDecl *FunTmpl
165 = Function->getDescribedFunctionTemplate()) {
166 // Add the "injected" template arguments.
167 Result.addOuterTemplateArguments(FunTmpl->getInjectedTemplateArgs());
168 }
169
170 // If this is a friend declaration and it declares an entity at
171 // namespace scope, take arguments from its lexical parent
172 // instead of its semantic parent, unless of course the pattern we're
173 // instantiating actually comes from the file's context!
174 if (Function->getFriendObjectKind() &&
175 Function->getDeclContext()->isFileContext() &&
176 (!Pattern || !Pattern->getLexicalDeclContext()->isFileContext())) {
177 Ctx = Function->getLexicalDeclContext();
178 RelativeToPrimary = false;
179 continue;
180 }
181 } else if (CXXRecordDecl *Rec = dyn_cast<CXXRecordDecl>(Ctx)) {
182 if (ClassTemplateDecl *ClassTemplate = Rec->getDescribedClassTemplate()) {
183 QualType T = ClassTemplate->getInjectedClassNameSpecialization();
184 const TemplateSpecializationType *TST =
185 cast<TemplateSpecializationType>(Context.getCanonicalType(T));
186 Result.addOuterTemplateArguments(
187 llvm::makeArrayRef(TST->getArgs(), TST->getNumArgs()));
188 if (ClassTemplate->isMemberSpecialization())
189 break;
190 }
191 }
192
193 Ctx = Ctx->getParent();
194 RelativeToPrimary = false;
195 }
196
197 return Result;
198}
199
200bool Sema::CodeSynthesisContext::isInstantiationRecord() const {
201 switch (Kind) {
202 case TemplateInstantiation:
203 case ExceptionSpecInstantiation:
204 case DefaultTemplateArgumentInstantiation:
205 case DefaultFunctionArgumentInstantiation:
206 case ExplicitTemplateArgumentSubstitution:
207 case DeducedTemplateArgumentSubstitution:
208 case PriorTemplateArgumentSubstitution:
209 case ConstraintsCheck:
210 case NestedRequirementConstraintsCheck:
211 return true;
212
213 case RequirementInstantiation:
214 case DefaultTemplateArgumentChecking:
215 case DeclaringSpecialMember:
216 case DeclaringImplicitEqualityComparison:
217 case DefiningSynthesizedFunction:
218 case ExceptionSpecEvaluation:
219 case ConstraintSubstitution:
220 case ParameterMappingSubstitution:
221 case ConstraintNormalization:
222 case RewritingOperatorAsSpaceship:
223 case InitializingStructuredBinding:
224 case MarkingClassDllexported:
225 return false;
226
227 // This function should never be called when Kind's value is Memoization.
228 case Memoization:
229 break;
230 }
231
232 llvm_unreachable("Invalid SynthesisKind!")::llvm::llvm_unreachable_internal("Invalid SynthesisKind!", "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 232)
;
233}
234
235Sema::InstantiatingTemplate::InstantiatingTemplate(
236 Sema &SemaRef, CodeSynthesisContext::SynthesisKind Kind,
237 SourceLocation PointOfInstantiation, SourceRange InstantiationRange,
238 Decl *Entity, NamedDecl *Template, ArrayRef<TemplateArgument> TemplateArgs,
239 sema::TemplateDeductionInfo *DeductionInfo)
240 : SemaRef(SemaRef) {
241 // Don't allow further instantiation if a fatal error and an uncompilable
242 // error have occurred. Any diagnostics we might have raised will not be
243 // visible, and we do not need to construct a correct AST.
244 if (SemaRef.Diags.hasFatalErrorOccurred() &&
36
Assuming the condition is false
245 SemaRef.hasUncompilableErrorOccurred()) {
246 Invalid = true;
247 return;
248 }
249 Invalid = CheckInstantiationDepth(PointOfInstantiation, InstantiationRange);
37
Calling 'InstantiatingTemplate::CheckInstantiationDepth'
43
Returning from 'InstantiatingTemplate::CheckInstantiationDepth'
250 if (!Invalid
43.1
Field 'Invalid' is false
43.1
Field 'Invalid' is false
) {
44
Taking true branch
251 CodeSynthesisContext Inst;
252 Inst.Kind = Kind;
253 Inst.PointOfInstantiation = PointOfInstantiation;
254 Inst.Entity = Entity;
255 Inst.Template = Template;
256 Inst.TemplateArgs = TemplateArgs.data();
257 Inst.NumTemplateArgs = TemplateArgs.size();
258 Inst.DeductionInfo = DeductionInfo;
259 Inst.InstantiationRange = InstantiationRange;
260 SemaRef.pushCodeSynthesisContext(Inst);
261
262 AlreadyInstantiating = !Inst.Entity
44.1
Field 'Entity' is non-null
44.1
Field 'Entity' is non-null
? false :
45
'?' condition is false
263 !SemaRef.InstantiatingSpecializations
46
Assuming field 'second' is true
264 .insert({Inst.Entity->getCanonicalDecl(), Inst.Kind})
265 .second;
266 atTemplateBegin(SemaRef.TemplateInstCallbacks, SemaRef, Inst);
267 }
268}
269
270Sema::InstantiatingTemplate::InstantiatingTemplate(
271 Sema &SemaRef, SourceLocation PointOfInstantiation, Decl *Entity,
272 SourceRange InstantiationRange)
273 : InstantiatingTemplate(SemaRef,
35
Calling constructor for 'InstantiatingTemplate'
47
Returning from constructor for 'InstantiatingTemplate'
274 CodeSynthesisContext::TemplateInstantiation,
275 PointOfInstantiation, InstantiationRange, Entity) {}
276
277Sema::InstantiatingTemplate::InstantiatingTemplate(
278 Sema &SemaRef, SourceLocation PointOfInstantiation, FunctionDecl *Entity,
279 ExceptionSpecification, SourceRange InstantiationRange)
280 : InstantiatingTemplate(
281 SemaRef, CodeSynthesisContext::ExceptionSpecInstantiation,
282 PointOfInstantiation, InstantiationRange, Entity) {}
283
284Sema::InstantiatingTemplate::InstantiatingTemplate(
285 Sema &SemaRef, SourceLocation PointOfInstantiation, TemplateParameter Param,
286 TemplateDecl *Template, ArrayRef<TemplateArgument> TemplateArgs,
287 SourceRange InstantiationRange)
288 : InstantiatingTemplate(
289 SemaRef,
290 CodeSynthesisContext::DefaultTemplateArgumentInstantiation,
291 PointOfInstantiation, InstantiationRange, getAsNamedDecl(Param),
292 Template, TemplateArgs) {}
293
294Sema::InstantiatingTemplate::InstantiatingTemplate(
295 Sema &SemaRef, SourceLocation PointOfInstantiation,
296 FunctionTemplateDecl *FunctionTemplate,
297 ArrayRef<TemplateArgument> TemplateArgs,
298 CodeSynthesisContext::SynthesisKind Kind,
299 sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
300 : InstantiatingTemplate(SemaRef, Kind, PointOfInstantiation,
301 InstantiationRange, FunctionTemplate, nullptr,
302 TemplateArgs, &DeductionInfo) {
303 assert(((Kind == CodeSynthesisContext::ExplicitTemplateArgumentSubstitution
|| Kind == CodeSynthesisContext::DeducedTemplateArgumentSubstitution
) ? static_cast<void> (0) : __assert_fail ("Kind == CodeSynthesisContext::ExplicitTemplateArgumentSubstitution || Kind == CodeSynthesisContext::DeducedTemplateArgumentSubstitution"
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 305, __PRETTY_FUNCTION__))
304 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 305, __PRETTY_FUNCTION__))
305 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 305, __PRETTY_FUNCTION__))
;
306}
307
308Sema::InstantiatingTemplate::InstantiatingTemplate(
309 Sema &SemaRef, SourceLocation PointOfInstantiation,
310 TemplateDecl *Template,
311 ArrayRef<TemplateArgument> TemplateArgs,
312 sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
313 : InstantiatingTemplate(
314 SemaRef,
315 CodeSynthesisContext::DeducedTemplateArgumentSubstitution,
316 PointOfInstantiation, InstantiationRange, Template, nullptr,
317 TemplateArgs, &DeductionInfo) {}
318
319Sema::InstantiatingTemplate::InstantiatingTemplate(
320 Sema &SemaRef, SourceLocation PointOfInstantiation,
321 ClassTemplatePartialSpecializationDecl *PartialSpec,
322 ArrayRef<TemplateArgument> TemplateArgs,
323 sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
324 : InstantiatingTemplate(
325 SemaRef,
326 CodeSynthesisContext::DeducedTemplateArgumentSubstitution,
327 PointOfInstantiation, InstantiationRange, PartialSpec, nullptr,
328 TemplateArgs, &DeductionInfo) {}
329
330Sema::InstantiatingTemplate::InstantiatingTemplate(
331 Sema &SemaRef, SourceLocation PointOfInstantiation,
332 VarTemplatePartialSpecializationDecl *PartialSpec,
333 ArrayRef<TemplateArgument> TemplateArgs,
334 sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
335 : InstantiatingTemplate(
336 SemaRef,
337 CodeSynthesisContext::DeducedTemplateArgumentSubstitution,
338 PointOfInstantiation, InstantiationRange, PartialSpec, nullptr,
339 TemplateArgs, &DeductionInfo) {}
340
341Sema::InstantiatingTemplate::InstantiatingTemplate(
342 Sema &SemaRef, SourceLocation PointOfInstantiation, ParmVarDecl *Param,
343 ArrayRef<TemplateArgument> TemplateArgs, SourceRange InstantiationRange)
344 : InstantiatingTemplate(
345 SemaRef,
346 CodeSynthesisContext::DefaultFunctionArgumentInstantiation,
347 PointOfInstantiation, InstantiationRange, Param, nullptr,
348 TemplateArgs) {}
349
350Sema::InstantiatingTemplate::InstantiatingTemplate(
351 Sema &SemaRef, SourceLocation PointOfInstantiation, NamedDecl *Template,
352 NonTypeTemplateParmDecl *Param, ArrayRef<TemplateArgument> TemplateArgs,
353 SourceRange InstantiationRange)
354 : InstantiatingTemplate(
355 SemaRef,
356 CodeSynthesisContext::PriorTemplateArgumentSubstitution,
357 PointOfInstantiation, InstantiationRange, Param, Template,
358 TemplateArgs) {}
359
360Sema::InstantiatingTemplate::InstantiatingTemplate(
361 Sema &SemaRef, SourceLocation PointOfInstantiation, NamedDecl *Template,
362 TemplateTemplateParmDecl *Param, ArrayRef<TemplateArgument> TemplateArgs,
363 SourceRange InstantiationRange)
364 : InstantiatingTemplate(
365 SemaRef,
366 CodeSynthesisContext::PriorTemplateArgumentSubstitution,
367 PointOfInstantiation, InstantiationRange, Param, Template,
368 TemplateArgs) {}
369
370Sema::InstantiatingTemplate::InstantiatingTemplate(
371 Sema &SemaRef, SourceLocation PointOfInstantiation, TemplateDecl *Template,
372 NamedDecl *Param, ArrayRef<TemplateArgument> TemplateArgs,
373 SourceRange InstantiationRange)
374 : InstantiatingTemplate(
375 SemaRef, CodeSynthesisContext::DefaultTemplateArgumentChecking,
376 PointOfInstantiation, InstantiationRange, Param, Template,
377 TemplateArgs) {}
378
379Sema::InstantiatingTemplate::InstantiatingTemplate(
380 Sema &SemaRef, SourceLocation PointOfInstantiation,
381 concepts::Requirement *Req, sema::TemplateDeductionInfo &DeductionInfo,
382 SourceRange InstantiationRange)
383 : InstantiatingTemplate(
384 SemaRef, CodeSynthesisContext::RequirementInstantiation,
385 PointOfInstantiation, InstantiationRange, /*Entity=*/nullptr,
386 /*Template=*/nullptr, /*TemplateArgs=*/None, &DeductionInfo) {}
387
388
389Sema::InstantiatingTemplate::InstantiatingTemplate(
390 Sema &SemaRef, SourceLocation PointOfInstantiation,
391 concepts::NestedRequirement *Req, ConstraintsCheck,
392 SourceRange InstantiationRange)
393 : InstantiatingTemplate(
394 SemaRef, CodeSynthesisContext::NestedRequirementConstraintsCheck,
395 PointOfInstantiation, InstantiationRange, /*Entity=*/nullptr,
396 /*Template=*/nullptr, /*TemplateArgs=*/None) {}
397
398
399Sema::InstantiatingTemplate::InstantiatingTemplate(
400 Sema &SemaRef, SourceLocation PointOfInstantiation,
401 ConstraintsCheck, NamedDecl *Template,
402 ArrayRef<TemplateArgument> TemplateArgs, SourceRange InstantiationRange)
403 : InstantiatingTemplate(
404 SemaRef, CodeSynthesisContext::ConstraintsCheck,
405 PointOfInstantiation, InstantiationRange, Template, nullptr,
406 TemplateArgs) {}
407
408Sema::InstantiatingTemplate::InstantiatingTemplate(
409 Sema &SemaRef, SourceLocation PointOfInstantiation,
410 ConstraintSubstitution, NamedDecl *Template,
411 sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
412 : InstantiatingTemplate(
413 SemaRef, CodeSynthesisContext::ConstraintSubstitution,
414 PointOfInstantiation, InstantiationRange, Template, nullptr,
415 {}, &DeductionInfo) {}
416
417Sema::InstantiatingTemplate::InstantiatingTemplate(
418 Sema &SemaRef, SourceLocation PointOfInstantiation,
419 ConstraintNormalization, NamedDecl *Template,
420 SourceRange InstantiationRange)
421 : InstantiatingTemplate(
422 SemaRef, CodeSynthesisContext::ConstraintNormalization,
423 PointOfInstantiation, InstantiationRange, Template) {}
424
425Sema::InstantiatingTemplate::InstantiatingTemplate(
426 Sema &SemaRef, SourceLocation PointOfInstantiation,
427 ParameterMappingSubstitution, NamedDecl *Template,
428 SourceRange InstantiationRange)
429 : InstantiatingTemplate(
430 SemaRef, CodeSynthesisContext::ParameterMappingSubstitution,
431 PointOfInstantiation, InstantiationRange, Template) {}
432
433void Sema::pushCodeSynthesisContext(CodeSynthesisContext Ctx) {
434 Ctx.SavedInNonInstantiationSFINAEContext = InNonInstantiationSFINAEContext;
435 InNonInstantiationSFINAEContext = false;
436
437 CodeSynthesisContexts.push_back(Ctx);
438
439 if (!Ctx.isInstantiationRecord())
440 ++NonInstantiationEntries;
441
442 // Check to see if we're low on stack space. We can't do anything about this
443 // from here, but we can at least warn the user.
444 if (isStackNearlyExhausted())
445 warnStackExhausted(Ctx.PointOfInstantiation);
446}
447
448void Sema::popCodeSynthesisContext() {
449 auto &Active = CodeSynthesisContexts.back();
450 if (!Active.isInstantiationRecord()) {
451 assert(NonInstantiationEntries > 0)((NonInstantiationEntries > 0) ? static_cast<void> (
0) : __assert_fail ("NonInstantiationEntries > 0", "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 451, __PRETTY_FUNCTION__))
;
452 --NonInstantiationEntries;
453 }
454
455 InNonInstantiationSFINAEContext = Active.SavedInNonInstantiationSFINAEContext;
456
457 // Name lookup no longer looks in this template's defining module.
458 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 460, __PRETTY_FUNCTION__))
459 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 460, __PRETTY_FUNCTION__))
460 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 460, __PRETTY_FUNCTION__))
;
461 if (CodeSynthesisContexts.size() ==
462 CodeSynthesisContextLookupModules.size()) {
463 if (Module *M = CodeSynthesisContextLookupModules.back())
464 LookupModulesCache.erase(M);
465 CodeSynthesisContextLookupModules.pop_back();
466 }
467
468 // If we've left the code synthesis context for the current context stack,
469 // stop remembering that we've emitted that stack.
470 if (CodeSynthesisContexts.size() ==
471 LastEmittedCodeSynthesisContextDepth)
472 LastEmittedCodeSynthesisContextDepth = 0;
473
474 CodeSynthesisContexts.pop_back();
475}
476
477void Sema::InstantiatingTemplate::Clear() {
478 if (!Invalid) {
479 if (!AlreadyInstantiating) {
480 auto &Active = SemaRef.CodeSynthesisContexts.back();
481 if (Active.Entity)
482 SemaRef.InstantiatingSpecializations.erase(
483 {Active.Entity->getCanonicalDecl(), Active.Kind});
484 }
485
486 atTemplateEnd(SemaRef.TemplateInstCallbacks, SemaRef,
487 SemaRef.CodeSynthesisContexts.back());
488
489 SemaRef.popCodeSynthesisContext();
490 Invalid = true;
491 }
492}
493
494bool Sema::InstantiatingTemplate::CheckInstantiationDepth(
495 SourceLocation PointOfInstantiation,
496 SourceRange InstantiationRange) {
497 assert(SemaRef.NonInstantiationEntries <=((SemaRef.NonInstantiationEntries <= SemaRef.CodeSynthesisContexts
.size()) ? static_cast<void> (0) : __assert_fail ("SemaRef.NonInstantiationEntries <= SemaRef.CodeSynthesisContexts.size()"
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 498, __PRETTY_FUNCTION__))
38
Assuming the condition is true
39
'?' condition is true
498 SemaRef.CodeSynthesisContexts.size())((SemaRef.NonInstantiationEntries <= SemaRef.CodeSynthesisContexts
.size()) ? static_cast<void> (0) : __assert_fail ("SemaRef.NonInstantiationEntries <= SemaRef.CodeSynthesisContexts.size()"
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 498, __PRETTY_FUNCTION__))
;
499 if ((SemaRef.CodeSynthesisContexts.size() -
40
Assuming the condition is true
41
Taking true branch
500 SemaRef.NonInstantiationEntries)
501 <= SemaRef.getLangOpts().InstantiationDepth)
502 return false;
42
Returning zero, which participates in a condition later
503
504 SemaRef.Diag(PointOfInstantiation,
505 diag::err_template_recursion_depth_exceeded)
506 << SemaRef.getLangOpts().InstantiationDepth
507 << InstantiationRange;
508 SemaRef.Diag(PointOfInstantiation, diag::note_template_recursion_depth)
509 << SemaRef.getLangOpts().InstantiationDepth;
510 return true;
511}
512
513/// Prints the current instantiation stack through a series of
514/// notes.
515void Sema::PrintInstantiationStack() {
516 // Determine which template instantiations to skip, if any.
517 unsigned SkipStart = CodeSynthesisContexts.size(), SkipEnd = SkipStart;
518 unsigned Limit = Diags.getTemplateBacktraceLimit();
519 if (Limit && Limit < CodeSynthesisContexts.size()) {
520 SkipStart = Limit / 2 + Limit % 2;
521 SkipEnd = CodeSynthesisContexts.size() - Limit / 2;
522 }
523
524 // FIXME: In all of these cases, we need to show the template arguments
525 unsigned InstantiationIdx = 0;
526 for (SmallVectorImpl<CodeSynthesisContext>::reverse_iterator
527 Active = CodeSynthesisContexts.rbegin(),
528 ActiveEnd = CodeSynthesisContexts.rend();
529 Active != ActiveEnd;
530 ++Active, ++InstantiationIdx) {
531 // Skip this instantiation?
532 if (InstantiationIdx >= SkipStart && InstantiationIdx < SkipEnd) {
533 if (InstantiationIdx == SkipStart) {
534 // Note that we're skipping instantiations.
535 Diags.Report(Active->PointOfInstantiation,
536 diag::note_instantiation_contexts_suppressed)
537 << unsigned(CodeSynthesisContexts.size() - Limit);
538 }
539 continue;
540 }
541
542 switch (Active->Kind) {
543 case CodeSynthesisContext::TemplateInstantiation: {
544 Decl *D = Active->Entity;
545 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) {
546 unsigned DiagID = diag::note_template_member_class_here;
547 if (isa<ClassTemplateSpecializationDecl>(Record))
548 DiagID = diag::note_template_class_instantiation_here;
549 Diags.Report(Active->PointOfInstantiation, DiagID)
550 << Record << Active->InstantiationRange;
551 } else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) {
552 unsigned DiagID;
553 if (Function->getPrimaryTemplate())
554 DiagID = diag::note_function_template_spec_here;
555 else
556 DiagID = diag::note_template_member_function_here;
557 Diags.Report(Active->PointOfInstantiation, DiagID)
558 << Function
559 << Active->InstantiationRange;
560 } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
561 Diags.Report(Active->PointOfInstantiation,
562 VD->isStaticDataMember()?
563 diag::note_template_static_data_member_def_here
564 : diag::note_template_variable_def_here)
565 << VD
566 << Active->InstantiationRange;
567 } else if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) {
568 Diags.Report(Active->PointOfInstantiation,
569 diag::note_template_enum_def_here)
570 << ED
571 << Active->InstantiationRange;
572 } else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
573 Diags.Report(Active->PointOfInstantiation,
574 diag::note_template_nsdmi_here)
575 << FD << Active->InstantiationRange;
576 } else {
577 Diags.Report(Active->PointOfInstantiation,
578 diag::note_template_type_alias_instantiation_here)
579 << cast<TypeAliasTemplateDecl>(D)
580 << Active->InstantiationRange;
581 }
582 break;
583 }
584
585 case CodeSynthesisContext::DefaultTemplateArgumentInstantiation: {
586 TemplateDecl *Template = cast<TemplateDecl>(Active->Template);
587 SmallString<128> TemplateArgsStr;
588 llvm::raw_svector_ostream OS(TemplateArgsStr);
589 Template->printName(OS);
590 printTemplateArgumentList(OS, Active->template_arguments(),
591 getPrintingPolicy());
592 Diags.Report(Active->PointOfInstantiation,
593 diag::note_default_arg_instantiation_here)
594 << OS.str()
595 << Active->InstantiationRange;
596 break;
597 }
598
599 case CodeSynthesisContext::ExplicitTemplateArgumentSubstitution: {
600 FunctionTemplateDecl *FnTmpl = cast<FunctionTemplateDecl>(Active->Entity);
601 Diags.Report(Active->PointOfInstantiation,
602 diag::note_explicit_template_arg_substitution_here)
603 << FnTmpl
604 << getTemplateArgumentBindingsText(FnTmpl->getTemplateParameters(),
605 Active->TemplateArgs,
606 Active->NumTemplateArgs)
607 << Active->InstantiationRange;
608 break;
609 }
610
611 case CodeSynthesisContext::DeducedTemplateArgumentSubstitution: {
612 if (FunctionTemplateDecl *FnTmpl =
613 dyn_cast<FunctionTemplateDecl>(Active->Entity)) {
614 Diags.Report(Active->PointOfInstantiation,
615 diag::note_function_template_deduction_instantiation_here)
616 << FnTmpl
617 << getTemplateArgumentBindingsText(FnTmpl->getTemplateParameters(),
618 Active->TemplateArgs,
619 Active->NumTemplateArgs)
620 << Active->InstantiationRange;
621 } else {
622 bool IsVar = isa<VarTemplateDecl>(Active->Entity) ||
623 isa<VarTemplateSpecializationDecl>(Active->Entity);
624 bool IsTemplate = false;
625 TemplateParameterList *Params;
626 if (auto *D = dyn_cast<TemplateDecl>(Active->Entity)) {
627 IsTemplate = true;
628 Params = D->getTemplateParameters();
629 } else if (auto *D = dyn_cast<ClassTemplatePartialSpecializationDecl>(
630 Active->Entity)) {
631 Params = D->getTemplateParameters();
632 } else if (auto *D = dyn_cast<VarTemplatePartialSpecializationDecl>(
633 Active->Entity)) {
634 Params = D->getTemplateParameters();
635 } else {
636 llvm_unreachable("unexpected template kind")::llvm::llvm_unreachable_internal("unexpected template kind",
"/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 636)
;
637 }
638
639 Diags.Report(Active->PointOfInstantiation,
640 diag::note_deduced_template_arg_substitution_here)
641 << IsVar << IsTemplate << cast<NamedDecl>(Active->Entity)
642 << getTemplateArgumentBindingsText(Params, Active->TemplateArgs,
643 Active->NumTemplateArgs)
644 << Active->InstantiationRange;
645 }
646 break;
647 }
648
649 case CodeSynthesisContext::DefaultFunctionArgumentInstantiation: {
650 ParmVarDecl *Param = cast<ParmVarDecl>(Active->Entity);
651 FunctionDecl *FD = cast<FunctionDecl>(Param->getDeclContext());
652
653 SmallString<128> TemplateArgsStr;
654 llvm::raw_svector_ostream OS(TemplateArgsStr);
655 FD->printName(OS);
656 printTemplateArgumentList(OS, Active->template_arguments(),
657 getPrintingPolicy());
658 Diags.Report(Active->PointOfInstantiation,
659 diag::note_default_function_arg_instantiation_here)
660 << OS.str()
661 << Active->InstantiationRange;
662 break;
663 }
664
665 case CodeSynthesisContext::PriorTemplateArgumentSubstitution: {
666 NamedDecl *Parm = cast<NamedDecl>(Active->Entity);
667 std::string Name;
668 if (!Parm->getName().empty())
669 Name = std::string(" '") + Parm->getName().str() + "'";
670
671 TemplateParameterList *TemplateParams = nullptr;
672 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(Active->Template))
673 TemplateParams = Template->getTemplateParameters();
674 else
675 TemplateParams =
676 cast<ClassTemplatePartialSpecializationDecl>(Active->Template)
677 ->getTemplateParameters();
678 Diags.Report(Active->PointOfInstantiation,
679 diag::note_prior_template_arg_substitution)
680 << isa<TemplateTemplateParmDecl>(Parm)
681 << Name
682 << getTemplateArgumentBindingsText(TemplateParams,
683 Active->TemplateArgs,
684 Active->NumTemplateArgs)
685 << Active->InstantiationRange;
686 break;
687 }
688
689 case CodeSynthesisContext::DefaultTemplateArgumentChecking: {
690 TemplateParameterList *TemplateParams = nullptr;
691 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(Active->Template))
692 TemplateParams = Template->getTemplateParameters();
693 else
694 TemplateParams =
695 cast<ClassTemplatePartialSpecializationDecl>(Active->Template)
696 ->getTemplateParameters();
697
698 Diags.Report(Active->PointOfInstantiation,
699 diag::note_template_default_arg_checking)
700 << getTemplateArgumentBindingsText(TemplateParams,
701 Active->TemplateArgs,
702 Active->NumTemplateArgs)
703 << Active->InstantiationRange;
704 break;
705 }
706
707 case CodeSynthesisContext::ExceptionSpecEvaluation:
708 Diags.Report(Active->PointOfInstantiation,
709 diag::note_evaluating_exception_spec_here)
710 << cast<FunctionDecl>(Active->Entity);
711 break;
712
713 case CodeSynthesisContext::ExceptionSpecInstantiation:
714 Diags.Report(Active->PointOfInstantiation,
715 diag::note_template_exception_spec_instantiation_here)
716 << cast<FunctionDecl>(Active->Entity)
717 << Active->InstantiationRange;
718 break;
719
720 case CodeSynthesisContext::RequirementInstantiation:
721 Diags.Report(Active->PointOfInstantiation,
722 diag::note_template_requirement_instantiation_here)
723 << Active->InstantiationRange;
724 break;
725
726 case CodeSynthesisContext::NestedRequirementConstraintsCheck:
727 Diags.Report(Active->PointOfInstantiation,
728 diag::note_nested_requirement_here)
729 << Active->InstantiationRange;
730 break;
731
732 case CodeSynthesisContext::DeclaringSpecialMember:
733 Diags.Report(Active->PointOfInstantiation,
734 diag::note_in_declaration_of_implicit_special_member)
735 << cast<CXXRecordDecl>(Active->Entity) << Active->SpecialMember;
736 break;
737
738 case CodeSynthesisContext::DeclaringImplicitEqualityComparison:
739 Diags.Report(Active->Entity->getLocation(),
740 diag::note_in_declaration_of_implicit_equality_comparison);
741 break;
742
743 case CodeSynthesisContext::DefiningSynthesizedFunction: {
744 // FIXME: For synthesized functions that are not defaulted,
745 // produce a note.
746 auto *FD = dyn_cast<FunctionDecl>(Active->Entity);
747 DefaultedFunctionKind DFK =
748 FD ? getDefaultedFunctionKind(FD) : DefaultedFunctionKind();
749 if (DFK.isSpecialMember()) {
750 auto *MD = cast<CXXMethodDecl>(FD);
751 Diags.Report(Active->PointOfInstantiation,
752 diag::note_member_synthesized_at)
753 << MD->isExplicitlyDefaulted() << DFK.asSpecialMember()
754 << Context.getTagDeclType(MD->getParent());
755 } else if (DFK.isComparison()) {
756 Diags.Report(Active->PointOfInstantiation,
757 diag::note_comparison_synthesized_at)
758 << (int)DFK.asComparison()
759 << Context.getTagDeclType(
760 cast<CXXRecordDecl>(FD->getLexicalDeclContext()));
761 }
762 break;
763 }
764
765 case CodeSynthesisContext::RewritingOperatorAsSpaceship:
766 Diags.Report(Active->Entity->getLocation(),
767 diag::note_rewriting_operator_as_spaceship);
768 break;
769
770 case CodeSynthesisContext::InitializingStructuredBinding:
771 Diags.Report(Active->PointOfInstantiation,
772 diag::note_in_binding_decl_init)
773 << cast<BindingDecl>(Active->Entity);
774 break;
775
776 case CodeSynthesisContext::MarkingClassDllexported:
777 Diags.Report(Active->PointOfInstantiation,
778 diag::note_due_to_dllexported_class)
779 << cast<CXXRecordDecl>(Active->Entity) << !getLangOpts().CPlusPlus11;
780 break;
781
782 case CodeSynthesisContext::Memoization:
783 break;
784
785 case CodeSynthesisContext::ConstraintsCheck: {
786 unsigned DiagID = 0;
787 if (!Active->Entity) {
788 Diags.Report(Active->PointOfInstantiation,
789 diag::note_nested_requirement_here)
790 << Active->InstantiationRange;
791 break;
792 }
793 if (isa<ConceptDecl>(Active->Entity))
794 DiagID = diag::note_concept_specialization_here;
795 else if (isa<TemplateDecl>(Active->Entity))
796 DiagID = diag::note_checking_constraints_for_template_id_here;
797 else if (isa<VarTemplatePartialSpecializationDecl>(Active->Entity))
798 DiagID = diag::note_checking_constraints_for_var_spec_id_here;
799 else if (isa<ClassTemplatePartialSpecializationDecl>(Active->Entity))
800 DiagID = diag::note_checking_constraints_for_class_spec_id_here;
801 else {
802 assert(isa<FunctionDecl>(Active->Entity))((isa<FunctionDecl>(Active->Entity)) ? static_cast<
void> (0) : __assert_fail ("isa<FunctionDecl>(Active->Entity)"
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 802, __PRETTY_FUNCTION__))
;
803 DiagID = diag::note_checking_constraints_for_function_here;
804 }
805 SmallString<128> TemplateArgsStr;
806 llvm::raw_svector_ostream OS(TemplateArgsStr);
807 cast<NamedDecl>(Active->Entity)->printName(OS);
808 if (!isa<FunctionDecl>(Active->Entity))
809 printTemplateArgumentList(OS, Active->template_arguments(),
810 getPrintingPolicy());
811 Diags.Report(Active->PointOfInstantiation, DiagID) << OS.str()
812 << Active->InstantiationRange;
813 break;
814 }
815 case CodeSynthesisContext::ConstraintSubstitution:
816 Diags.Report(Active->PointOfInstantiation,
817 diag::note_constraint_substitution_here)
818 << Active->InstantiationRange;
819 break;
820 case CodeSynthesisContext::ConstraintNormalization:
821 Diags.Report(Active->PointOfInstantiation,
822 diag::note_constraint_normalization_here)
823 << cast<NamedDecl>(Active->Entity)->getName()
824 << Active->InstantiationRange;
825 break;
826 case CodeSynthesisContext::ParameterMappingSubstitution:
827 Diags.Report(Active->PointOfInstantiation,
828 diag::note_parameter_mapping_substitution_here)
829 << Active->InstantiationRange;
830 break;
831 }
832 }
833}
834
835Optional<TemplateDeductionInfo *> Sema::isSFINAEContext() const {
836 if (InNonInstantiationSFINAEContext)
837 return Optional<TemplateDeductionInfo *>(nullptr);
838
839 for (SmallVectorImpl<CodeSynthesisContext>::const_reverse_iterator
840 Active = CodeSynthesisContexts.rbegin(),
841 ActiveEnd = CodeSynthesisContexts.rend();
842 Active != ActiveEnd;
843 ++Active)
844 {
845 switch (Active->Kind) {
846 case CodeSynthesisContext::TemplateInstantiation:
847 // An instantiation of an alias template may or may not be a SFINAE
848 // context, depending on what else is on the stack.
849 if (isa<TypeAliasTemplateDecl>(Active->Entity))
850 break;
851 LLVM_FALLTHROUGH[[gnu::fallthrough]];
852 case CodeSynthesisContext::DefaultFunctionArgumentInstantiation:
853 case CodeSynthesisContext::ExceptionSpecInstantiation:
854 case CodeSynthesisContext::ConstraintsCheck:
855 case CodeSynthesisContext::ParameterMappingSubstitution:
856 case CodeSynthesisContext::ConstraintNormalization:
857 case CodeSynthesisContext::NestedRequirementConstraintsCheck:
858 // This is a template instantiation, so there is no SFINAE.
859 return None;
860
861 case CodeSynthesisContext::DefaultTemplateArgumentInstantiation:
862 case CodeSynthesisContext::PriorTemplateArgumentSubstitution:
863 case CodeSynthesisContext::DefaultTemplateArgumentChecking:
864 case CodeSynthesisContext::RewritingOperatorAsSpaceship:
865 // A default template argument instantiation and substitution into
866 // template parameters with arguments for prior parameters may or may
867 // not be a SFINAE context; look further up the stack.
868 break;
869
870 case CodeSynthesisContext::ExplicitTemplateArgumentSubstitution:
871 case CodeSynthesisContext::DeducedTemplateArgumentSubstitution:
872 case CodeSynthesisContext::ConstraintSubstitution:
873 case CodeSynthesisContext::RequirementInstantiation:
874 // We're either substituting explicitly-specified template arguments,
875 // deduced template arguments, a constraint expression or a requirement
876 // in a requires expression, so SFINAE applies.
877 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 877, __PRETTY_FUNCTION__))
;
878 return Active->DeductionInfo;
879
880 case CodeSynthesisContext::DeclaringSpecialMember:
881 case CodeSynthesisContext::DeclaringImplicitEqualityComparison:
882 case CodeSynthesisContext::DefiningSynthesizedFunction:
883 case CodeSynthesisContext::InitializingStructuredBinding:
884 case CodeSynthesisContext::MarkingClassDllexported:
885 // This happens in a context unrelated to template instantiation, so
886 // there is no SFINAE.
887 return None;
888
889 case CodeSynthesisContext::ExceptionSpecEvaluation:
890 // FIXME: This should not be treated as a SFINAE context, because
891 // we will cache an incorrect exception specification. However, clang
892 // bootstrap relies this! See PR31692.
893 break;
894
895 case CodeSynthesisContext::Memoization:
896 break;
897 }
898
899 // The inner context was transparent for SFINAE. If it occurred within a
900 // non-instantiation SFINAE context, then SFINAE applies.
901 if (Active->SavedInNonInstantiationSFINAEContext)
902 return Optional<TemplateDeductionInfo *>(nullptr);
903 }
904
905 return None;
906}
907
908//===----------------------------------------------------------------------===/
909// Template Instantiation for Types
910//===----------------------------------------------------------------------===/
911namespace {
912 class TemplateInstantiator : public TreeTransform<TemplateInstantiator> {
913 const MultiLevelTemplateArgumentList &TemplateArgs;
914 SourceLocation Loc;
915 DeclarationName Entity;
916
917 public:
918 typedef TreeTransform<TemplateInstantiator> inherited;
919
920 TemplateInstantiator(Sema &SemaRef,
921 const MultiLevelTemplateArgumentList &TemplateArgs,
922 SourceLocation Loc,
923 DeclarationName Entity)
924 : inherited(SemaRef), TemplateArgs(TemplateArgs), Loc(Loc),
925 Entity(Entity) { }
926
927 /// Determine whether the given type \p T has already been
928 /// transformed.
929 ///
930 /// For the purposes of template instantiation, a type has already been
931 /// transformed if it is NULL or if it is not dependent.
932 bool AlreadyTransformed(QualType T);
933
934 /// Returns the location of the entity being instantiated, if known.
935 SourceLocation getBaseLocation() { return Loc; }
936
937 /// Returns the name of the entity being instantiated, if any.
938 DeclarationName getBaseEntity() { return Entity; }
939
940 /// Sets the "base" location and entity when that
941 /// information is known based on another transformation.
942 void setBase(SourceLocation Loc, DeclarationName Entity) {
943 this->Loc = Loc;
944 this->Entity = Entity;
945 }
946
947 unsigned TransformTemplateDepth(unsigned Depth) {
948 return TemplateArgs.getNewDepth(Depth);
949 }
950
951 bool TryExpandParameterPacks(SourceLocation EllipsisLoc,
952 SourceRange PatternRange,
953 ArrayRef<UnexpandedParameterPack> Unexpanded,
954 bool &ShouldExpand, bool &RetainExpansion,
955 Optional<unsigned> &NumExpansions) {
956 return getSema().CheckParameterPacksForExpansion(EllipsisLoc,
957 PatternRange, Unexpanded,
958 TemplateArgs,
959 ShouldExpand,
960 RetainExpansion,
961 NumExpansions);
962 }
963
964 void ExpandingFunctionParameterPack(ParmVarDecl *Pack) {
965 SemaRef.CurrentInstantiationScope->MakeInstantiatedLocalArgPack(Pack);
966 }
967
968 TemplateArgument ForgetPartiallySubstitutedPack() {
969 TemplateArgument Result;
970 if (NamedDecl *PartialPack
971 = SemaRef.CurrentInstantiationScope->getPartiallySubstitutedPack()){
972 MultiLevelTemplateArgumentList &TemplateArgs
973 = const_cast<MultiLevelTemplateArgumentList &>(this->TemplateArgs);
974 unsigned Depth, Index;
975 std::tie(Depth, Index) = getDepthAndIndex(PartialPack);
976 if (TemplateArgs.hasTemplateArgument(Depth, Index)) {
977 Result = TemplateArgs(Depth, Index);
978 TemplateArgs.setArgument(Depth, Index, TemplateArgument());
979 }
980 }
981
982 return Result;
983 }
984
985 void RememberPartiallySubstitutedPack(TemplateArgument Arg) {
986 if (Arg.isNull())
987 return;
988
989 if (NamedDecl *PartialPack
990 = SemaRef.CurrentInstantiationScope->getPartiallySubstitutedPack()){
991 MultiLevelTemplateArgumentList &TemplateArgs
992 = const_cast<MultiLevelTemplateArgumentList &>(this->TemplateArgs);
993 unsigned Depth, Index;
994 std::tie(Depth, Index) = getDepthAndIndex(PartialPack);
995 TemplateArgs.setArgument(Depth, Index, Arg);
996 }
997 }
998
999 /// Transform the given declaration by instantiating a reference to
1000 /// this declaration.
1001 Decl *TransformDecl(SourceLocation Loc, Decl *D);
1002
1003 void transformAttrs(Decl *Old, Decl *New) {
1004 SemaRef.InstantiateAttrs(TemplateArgs, Old, New);
1005 }
1006
1007 void transformedLocalDecl(Decl *Old, ArrayRef<Decl *> NewDecls) {
1008 if (Old->isParameterPack()) {
1009 SemaRef.CurrentInstantiationScope->MakeInstantiatedLocalArgPack(Old);
1010 for (auto *New : NewDecls)
1011 SemaRef.CurrentInstantiationScope->InstantiatedLocalPackArg(
1012 Old, cast<VarDecl>(New));
1013 return;
1014 }
1015
1016 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1017, __PRETTY_FUNCTION__))
1017 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1017, __PRETTY_FUNCTION__))
;
1018 Decl *New = NewDecls.front();
1019
1020 // If we've instantiated the call operator of a lambda or the call
1021 // operator template of a generic lambda, update the "instantiation of"
1022 // information.
1023 auto *NewMD = dyn_cast<CXXMethodDecl>(New);
1024 if (NewMD && isLambdaCallOperator(NewMD)) {
1025 auto *OldMD = dyn_cast<CXXMethodDecl>(Old);
1026 if (auto *NewTD = NewMD->getDescribedFunctionTemplate())
1027 NewTD->setInstantiatedFromMemberTemplate(
1028 OldMD->getDescribedFunctionTemplate());
1029 else
1030 NewMD->setInstantiationOfMemberFunction(OldMD,
1031 TSK_ImplicitInstantiation);
1032 }
1033
1034 SemaRef.CurrentInstantiationScope->InstantiatedLocal(Old, New);
1035
1036 // We recreated a local declaration, but not by instantiating it. There
1037 // may be pending dependent diagnostics to produce.
1038 if (auto *DC = dyn_cast<DeclContext>(Old))
1039 SemaRef.PerformDependentDiagnostics(DC, TemplateArgs);
1040 }
1041
1042 /// Transform the definition of the given declaration by
1043 /// instantiating it.
1044 Decl *TransformDefinition(SourceLocation Loc, Decl *D);
1045
1046 /// Transform the first qualifier within a scope by instantiating the
1047 /// declaration.
1048 NamedDecl *TransformFirstQualifierInScope(NamedDecl *D, SourceLocation Loc);
1049
1050 /// Rebuild the exception declaration and register the declaration
1051 /// as an instantiated local.
1052 VarDecl *RebuildExceptionDecl(VarDecl *ExceptionDecl,
1053 TypeSourceInfo *Declarator,
1054 SourceLocation StartLoc,
1055 SourceLocation NameLoc,
1056 IdentifierInfo *Name);
1057
1058 /// Rebuild the Objective-C exception declaration and register the
1059 /// declaration as an instantiated local.
1060 VarDecl *RebuildObjCExceptionDecl(VarDecl *ExceptionDecl,
1061 TypeSourceInfo *TSInfo, QualType T);
1062
1063 /// Check for tag mismatches when instantiating an
1064 /// elaborated type.
1065 QualType RebuildElaboratedType(SourceLocation KeywordLoc,
1066 ElaboratedTypeKeyword Keyword,
1067 NestedNameSpecifierLoc QualifierLoc,
1068 QualType T);
1069
1070 TemplateName
1071 TransformTemplateName(CXXScopeSpec &SS, TemplateName Name,
1072 SourceLocation NameLoc,
1073 QualType ObjectType = QualType(),
1074 NamedDecl *FirstQualifierInScope = nullptr,
1075 bool AllowInjectedClassName = false);
1076
1077 const LoopHintAttr *TransformLoopHintAttr(const LoopHintAttr *LH);
1078
1079 ExprResult TransformPredefinedExpr(PredefinedExpr *E);
1080 ExprResult TransformDeclRefExpr(DeclRefExpr *E);
1081 ExprResult TransformCXXDefaultArgExpr(CXXDefaultArgExpr *E);
1082
1083 ExprResult TransformTemplateParmRefExpr(DeclRefExpr *E,
1084 NonTypeTemplateParmDecl *D);
1085 ExprResult TransformSubstNonTypeTemplateParmPackExpr(
1086 SubstNonTypeTemplateParmPackExpr *E);
1087 ExprResult TransformSubstNonTypeTemplateParmExpr(
1088 SubstNonTypeTemplateParmExpr *E);
1089
1090 /// Rebuild a DeclRefExpr for a VarDecl reference.
1091 ExprResult RebuildVarDeclRefExpr(VarDecl *PD, SourceLocation Loc);
1092
1093 /// Transform a reference to a function or init-capture parameter pack.
1094 ExprResult TransformFunctionParmPackRefExpr(DeclRefExpr *E, VarDecl *PD);
1095
1096 /// Transform a FunctionParmPackExpr which was built when we couldn't
1097 /// expand a function parameter pack reference which refers to an expanded
1098 /// pack.
1099 ExprResult TransformFunctionParmPackExpr(FunctionParmPackExpr *E);
1100
1101 QualType TransformFunctionProtoType(TypeLocBuilder &TLB,
1102 FunctionProtoTypeLoc TL) {
1103 // Call the base version; it will forward to our overridden version below.
1104 return inherited::TransformFunctionProtoType(TLB, TL);
1105 }
1106
1107 template<typename Fn>
1108 QualType TransformFunctionProtoType(TypeLocBuilder &TLB,
1109 FunctionProtoTypeLoc TL,
1110 CXXRecordDecl *ThisContext,
1111 Qualifiers ThisTypeQuals,
1112 Fn TransformExceptionSpec);
1113
1114 ParmVarDecl *TransformFunctionTypeParam(ParmVarDecl *OldParm,
1115 int indexAdjustment,
1116 Optional<unsigned> NumExpansions,
1117 bool ExpectParameterPack);
1118
1119 /// Transforms a template type parameter type by performing
1120 /// substitution of the corresponding template type argument.
1121 QualType TransformTemplateTypeParmType(TypeLocBuilder &TLB,
1122 TemplateTypeParmTypeLoc TL);
1123
1124 /// Transforms an already-substituted template type parameter pack
1125 /// into either itself (if we aren't substituting into its pack expansion)
1126 /// or the appropriate substituted argument.
1127 QualType TransformSubstTemplateTypeParmPackType(TypeLocBuilder &TLB,
1128 SubstTemplateTypeParmPackTypeLoc TL);
1129
1130 ExprResult TransformLambdaExpr(LambdaExpr *E) {
1131 LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true);
1132 return TreeTransform<TemplateInstantiator>::TransformLambdaExpr(E);
1133 }
1134
1135 ExprResult TransformRequiresExpr(RequiresExpr *E) {
1136 LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true);
1137 return TreeTransform<TemplateInstantiator>::TransformRequiresExpr(E);
1138 }
1139
1140 bool TransformRequiresExprRequirements(
1141 ArrayRef<concepts::Requirement *> Reqs,
1142 SmallVectorImpl<concepts::Requirement *> &Transformed) {
1143 bool SatisfactionDetermined = false;
1144 for (concepts::Requirement *Req : Reqs) {
1145 concepts::Requirement *TransReq = nullptr;
1146 if (!SatisfactionDetermined) {
1147 if (auto *TypeReq = dyn_cast<concepts::TypeRequirement>(Req))
1148 TransReq = TransformTypeRequirement(TypeReq);
1149 else if (auto *ExprReq = dyn_cast<concepts::ExprRequirement>(Req))
1150 TransReq = TransformExprRequirement(ExprReq);
1151 else
1152 TransReq = TransformNestedRequirement(
1153 cast<concepts::NestedRequirement>(Req));
1154 if (!TransReq)
1155 return true;
1156 if (!TransReq->isDependent() && !TransReq->isSatisfied())
1157 // [expr.prim.req]p6
1158 // [...] The substitution and semantic constraint checking
1159 // proceeds in lexical order and stops when a condition that
1160 // determines the result of the requires-expression is
1161 // encountered. [..]
1162 SatisfactionDetermined = true;
1163 } else
1164 TransReq = Req;
1165 Transformed.push_back(TransReq);
1166 }
1167 return false;
1168 }
1169
1170 TemplateParameterList *TransformTemplateParameterList(
1171 TemplateParameterList *OrigTPL) {
1172 if (!OrigTPL || !OrigTPL->size()) return OrigTPL;
1173
1174 DeclContext *Owner = OrigTPL->getParam(0)->getDeclContext();
1175 TemplateDeclInstantiator DeclInstantiator(getSema(),
1176 /* DeclContext *Owner */ Owner, TemplateArgs);
1177 return DeclInstantiator.SubstTemplateParams(OrigTPL);
1178 }
1179
1180 concepts::TypeRequirement *
1181 TransformTypeRequirement(concepts::TypeRequirement *Req);
1182 concepts::ExprRequirement *
1183 TransformExprRequirement(concepts::ExprRequirement *Req);
1184 concepts::NestedRequirement *
1185 TransformNestedRequirement(concepts::NestedRequirement *Req);
1186
1187 private:
1188 ExprResult transformNonTypeTemplateParmRef(NonTypeTemplateParmDecl *parm,
1189 SourceLocation loc,
1190 TemplateArgument arg);
1191 };
1192}
1193
1194bool TemplateInstantiator::AlreadyTransformed(QualType T) {
1195 if (T.isNull())
1196 return true;
1197
1198 if (T->isInstantiationDependentType() || T->isVariablyModifiedType())
1199 return false;
1200
1201 getSema().MarkDeclarationsReferencedInType(Loc, T);
1202 return true;
1203}
1204
1205static TemplateArgument
1206getPackSubstitutedTemplateArgument(Sema &S, TemplateArgument Arg) {
1207 assert(S.ArgumentPackSubstitutionIndex >= 0)((S.ArgumentPackSubstitutionIndex >= 0) ? static_cast<void
> (0) : __assert_fail ("S.ArgumentPackSubstitutionIndex >= 0"
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1207, __PRETTY_FUNCTION__))
;
1208 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1208, __PRETTY_FUNCTION__))
;
1209 Arg = Arg.pack_begin()[S.ArgumentPackSubstitutionIndex];
1210 if (Arg.isPackExpansion())
1211 Arg = Arg.getPackExpansionPattern();
1212 return Arg;
1213}
1214
1215Decl *TemplateInstantiator::TransformDecl(SourceLocation Loc, Decl *D) {
1216 if (!D)
1217 return nullptr;
1218
1219 if (TemplateTemplateParmDecl *TTP = dyn_cast<TemplateTemplateParmDecl>(D)) {
1220 if (TTP->getDepth() < TemplateArgs.getNumLevels()) {
1221 // If the corresponding template argument is NULL or non-existent, it's
1222 // because we are performing instantiation from explicitly-specified
1223 // template arguments in a function template, but there were some
1224 // arguments left unspecified.
1225 if (!TemplateArgs.hasTemplateArgument(TTP->getDepth(),
1226 TTP->getPosition()))
1227 return D;
1228
1229 TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getPosition());
1230
1231 if (TTP->isParameterPack()) {
1232 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1233, __PRETTY_FUNCTION__))
1233 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1233, __PRETTY_FUNCTION__))
;
1234 Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
1235 }
1236
1237 TemplateName Template = Arg.getAsTemplate().getNameToSubstitute();
1238 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1239, __PRETTY_FUNCTION__))
1239 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1239, __PRETTY_FUNCTION__))
;
1240 return Template.getAsTemplateDecl();
1241 }
1242
1243 // Fall through to find the instantiated declaration for this template
1244 // template parameter.
1245 }
1246
1247 return SemaRef.FindInstantiatedDecl(Loc, cast<NamedDecl>(D), TemplateArgs);
1248}
1249
1250Decl *TemplateInstantiator::TransformDefinition(SourceLocation Loc, Decl *D) {
1251 Decl *Inst = getSema().SubstDecl(D, getSema().CurContext, TemplateArgs);
1252 if (!Inst)
1253 return nullptr;
1254
1255 getSema().CurrentInstantiationScope->InstantiatedLocal(D, Inst);
1256 return Inst;
1257}
1258
1259NamedDecl *
1260TemplateInstantiator::TransformFirstQualifierInScope(NamedDecl *D,
1261 SourceLocation Loc) {
1262 // If the first part of the nested-name-specifier was a template type
1263 // parameter, instantiate that type parameter down to a tag type.
1264 if (TemplateTypeParmDecl *TTPD = dyn_cast_or_null<TemplateTypeParmDecl>(D)) {
1265 const TemplateTypeParmType *TTP
1266 = cast<TemplateTypeParmType>(getSema().Context.getTypeDeclType(TTPD));
1267
1268 if (TTP->getDepth() < TemplateArgs.getNumLevels()) {
1269 // FIXME: This needs testing w/ member access expressions.
1270 TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getIndex());
1271
1272 if (TTP->isParameterPack()) {
1273 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1274, __PRETTY_FUNCTION__))
1274 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1274, __PRETTY_FUNCTION__))
;
1275
1276 if (getSema().ArgumentPackSubstitutionIndex == -1)
1277 return nullptr;
1278
1279 Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
1280 }
1281
1282 QualType T = Arg.getAsType();
1283 if (T.isNull())
1284 return cast_or_null<NamedDecl>(TransformDecl(Loc, D));
1285
1286 if (const TagType *Tag = T->getAs<TagType>())
1287 return Tag->getDecl();
1288
1289 // The resulting type is not a tag; complain.
1290 getSema().Diag(Loc, diag::err_nested_name_spec_non_tag) << T;
1291 return nullptr;
1292 }
1293 }
1294
1295 return cast_or_null<NamedDecl>(TransformDecl(Loc, D));
1296}
1297
1298VarDecl *
1299TemplateInstantiator::RebuildExceptionDecl(VarDecl *ExceptionDecl,
1300 TypeSourceInfo *Declarator,
1301 SourceLocation StartLoc,
1302 SourceLocation NameLoc,
1303 IdentifierInfo *Name) {
1304 VarDecl *Var = inherited::RebuildExceptionDecl(ExceptionDecl, Declarator,
1305 StartLoc, NameLoc, Name);
1306 if (Var)
1307 getSema().CurrentInstantiationScope->InstantiatedLocal(ExceptionDecl, Var);
1308 return Var;
1309}
1310
1311VarDecl *TemplateInstantiator::RebuildObjCExceptionDecl(VarDecl *ExceptionDecl,
1312 TypeSourceInfo *TSInfo,
1313 QualType T) {
1314 VarDecl *Var = inherited::RebuildObjCExceptionDecl(ExceptionDecl, TSInfo, T);
1315 if (Var)
1316 getSema().CurrentInstantiationScope->InstantiatedLocal(ExceptionDecl, Var);
1317 return Var;
1318}
1319
1320QualType
1321TemplateInstantiator::RebuildElaboratedType(SourceLocation KeywordLoc,
1322 ElaboratedTypeKeyword Keyword,
1323 NestedNameSpecifierLoc QualifierLoc,
1324 QualType T) {
1325 if (const TagType *TT = T->getAs<TagType>()) {
1326 TagDecl* TD = TT->getDecl();
1327
1328 SourceLocation TagLocation = KeywordLoc;
1329
1330 IdentifierInfo *Id = TD->getIdentifier();
1331
1332 // TODO: should we even warn on struct/class mismatches for this? Seems
1333 // like it's likely to produce a lot of spurious errors.
1334 if (Id && Keyword != ETK_None && Keyword != ETK_Typename) {
1335 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForKeyword(Keyword);
1336 if (!SemaRef.isAcceptableTagRedeclaration(TD, Kind, /*isDefinition*/false,
1337 TagLocation, Id)) {
1338 SemaRef.Diag(TagLocation, diag::err_use_with_wrong_tag)
1339 << Id
1340 << FixItHint::CreateReplacement(SourceRange(TagLocation),
1341 TD->getKindName());
1342 SemaRef.Diag(TD->getLocation(), diag::note_previous_use);
1343 }
1344 }
1345 }
1346
1347 return TreeTransform<TemplateInstantiator>::RebuildElaboratedType(KeywordLoc,
1348 Keyword,
1349 QualifierLoc,
1350 T);
1351}
1352
1353TemplateName TemplateInstantiator::TransformTemplateName(
1354 CXXScopeSpec &SS, TemplateName Name, SourceLocation NameLoc,
1355 QualType ObjectType, NamedDecl *FirstQualifierInScope,
1356 bool AllowInjectedClassName) {
1357 if (TemplateTemplateParmDecl *TTP
1358 = dyn_cast_or_null<TemplateTemplateParmDecl>(Name.getAsTemplateDecl())) {
1359 if (TTP->getDepth() < TemplateArgs.getNumLevels()) {
1360 // If the corresponding template argument is NULL or non-existent, it's
1361 // because we are performing instantiation from explicitly-specified
1362 // template arguments in a function template, but there were some
1363 // arguments left unspecified.
1364 if (!TemplateArgs.hasTemplateArgument(TTP->getDepth(),
1365 TTP->getPosition()))
1366 return Name;
1367
1368 TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getPosition());
1369
1370 if (TemplateArgs.isRewrite()) {
1371 // We're rewriting the template parameter as a reference to another
1372 // template parameter.
1373 if (Arg.getKind() == TemplateArgument::Pack) {
1374 assert(Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() &&((Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion
() && "unexpected pack arguments in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() && \"unexpected pack arguments in template rewrite\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1375, __PRETTY_FUNCTION__))
1375 "unexpected pack arguments in template rewrite")((Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion
() && "unexpected pack arguments in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() && \"unexpected pack arguments in template rewrite\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1375, __PRETTY_FUNCTION__))
;
1376 Arg = Arg.pack_begin()->getPackExpansionPattern();
1377 }
1378 assert(Arg.getKind() == TemplateArgument::Template &&((Arg.getKind() == TemplateArgument::Template && "unexpected nontype template argument kind in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Template && \"unexpected nontype template argument kind in template rewrite\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1379, __PRETTY_FUNCTION__))
1379 "unexpected nontype template argument kind in template rewrite")((Arg.getKind() == TemplateArgument::Template && "unexpected nontype template argument kind in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Template && \"unexpected nontype template argument kind in template rewrite\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1379, __PRETTY_FUNCTION__))
;
1380 return Arg.getAsTemplate();
1381 }
1382
1383 if (TTP->isParameterPack()) {
1384 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1385, __PRETTY_FUNCTION__))
1385 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1385, __PRETTY_FUNCTION__))
;
1386
1387 if (getSema().ArgumentPackSubstitutionIndex == -1) {
1388 // We have the template argument pack to substitute, but we're not
1389 // actually expanding the enclosing pack expansion yet. So, just
1390 // keep the entire argument pack.
1391 return getSema().Context.getSubstTemplateTemplateParmPack(TTP, Arg);
1392 }
1393
1394 Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
1395 }
1396
1397 TemplateName Template = Arg.getAsTemplate().getNameToSubstitute();
1398 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1398, __PRETTY_FUNCTION__))
;
1399 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1400, __PRETTY_FUNCTION__))
1400 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1400, __PRETTY_FUNCTION__))
;
1401
1402 Template = getSema().Context.getSubstTemplateTemplateParm(TTP, Template);
1403 return Template;
1404 }
1405 }
1406
1407 if (SubstTemplateTemplateParmPackStorage *SubstPack
1408 = Name.getAsSubstTemplateTemplateParmPack()) {
1409 if (getSema().ArgumentPackSubstitutionIndex == -1)
1410 return Name;
1411
1412 TemplateArgument Arg = SubstPack->getArgumentPack();
1413 Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
1414 return Arg.getAsTemplate().getNameToSubstitute();
1415 }
1416
1417 return inherited::TransformTemplateName(SS, Name, NameLoc, ObjectType,
1418 FirstQualifierInScope,
1419 AllowInjectedClassName);
1420}
1421
1422ExprResult
1423TemplateInstantiator::TransformPredefinedExpr(PredefinedExpr *E) {
1424 if (!E->isTypeDependent())
1425 return E;
1426
1427 return getSema().BuildPredefinedExpr(E->getLocation(), E->getIdentKind());
1428}
1429
1430ExprResult
1431TemplateInstantiator::TransformTemplateParmRefExpr(DeclRefExpr *E,
1432 NonTypeTemplateParmDecl *NTTP) {
1433 // If the corresponding template argument is NULL or non-existent, it's
1434 // because we are performing instantiation from explicitly-specified
1435 // template arguments in a function template, but there were some
1436 // arguments left unspecified.
1437 if (!TemplateArgs.hasTemplateArgument(NTTP->getDepth(),
1438 NTTP->getPosition()))
1439 return E;
1440
1441 TemplateArgument Arg = TemplateArgs(NTTP->getDepth(), NTTP->getPosition());
1442
1443 if (TemplateArgs.isRewrite()) {
1444 // We're rewriting the template parameter as a reference to another
1445 // template parameter.
1446 if (Arg.getKind() == TemplateArgument::Pack) {
1447 assert(Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() &&((Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion
() && "unexpected pack arguments in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() && \"unexpected pack arguments in template rewrite\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1448, __PRETTY_FUNCTION__))
1448 "unexpected pack arguments in template rewrite")((Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion
() && "unexpected pack arguments in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() && \"unexpected pack arguments in template rewrite\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1448, __PRETTY_FUNCTION__))
;
1449 Arg = Arg.pack_begin()->getPackExpansionPattern();
1450 }
1451 assert(Arg.getKind() == TemplateArgument::Expression &&((Arg.getKind() == TemplateArgument::Expression && "unexpected nontype template argument kind in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Expression && \"unexpected nontype template argument kind in template rewrite\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1452, __PRETTY_FUNCTION__))
1452 "unexpected nontype template argument kind in template rewrite")((Arg.getKind() == TemplateArgument::Expression && "unexpected nontype template argument kind in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Expression && \"unexpected nontype template argument kind in template rewrite\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1452, __PRETTY_FUNCTION__))
;
1453 // FIXME: This can lead to the same subexpression appearing multiple times
1454 // in a complete expression.
1455 return Arg.getAsExpr();
1456 }
1457
1458 if (NTTP->isParameterPack()) {
1459 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1460, __PRETTY_FUNCTION__))
1460 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1460, __PRETTY_FUNCTION__))
;
1461
1462 if (getSema().ArgumentPackSubstitutionIndex == -1) {
1463 // We have an argument pack, but we can't select a particular argument
1464 // out of it yet. Therefore, we'll build an expression to hold on to that
1465 // argument pack.
1466 QualType TargetType = SemaRef.SubstType(NTTP->getType(), TemplateArgs,
1467 E->getLocation(),
1468 NTTP->getDeclName());
1469 if (TargetType.isNull())
1470 return ExprError();
1471
1472 QualType ExprType = TargetType.getNonLValueExprType(SemaRef.Context);
1473 if (TargetType->isRecordType())
1474 ExprType.addConst();
1475
1476 return new (SemaRef.Context) SubstNonTypeTemplateParmPackExpr(
1477 ExprType, TargetType->isReferenceType() ? VK_LValue : VK_RValue, NTTP,
1478 E->getLocation(), Arg);
1479 }
1480
1481 Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
1482 }
1483
1484 return transformNonTypeTemplateParmRef(NTTP, E->getLocation(), Arg);
1485}
1486
1487const LoopHintAttr *
1488TemplateInstantiator::TransformLoopHintAttr(const LoopHintAttr *LH) {
1489 Expr *TransformedExpr = getDerived().TransformExpr(LH->getValue()).get();
1490
1491 if (TransformedExpr == LH->getValue())
1492 return LH;
1493
1494 // Generate error if there is a problem with the value.
1495 if (getSema().CheckLoopHintExpr(TransformedExpr, LH->getLocation()))
1496 return LH;
1497
1498 // Create new LoopHintValueAttr with integral expression in place of the
1499 // non-type template parameter.
1500 return LoopHintAttr::CreateImplicit(getSema().Context, LH->getOption(),
1501 LH->getState(), TransformedExpr, *LH);
1502}
1503
1504ExprResult TemplateInstantiator::transformNonTypeTemplateParmRef(
1505 NonTypeTemplateParmDecl *parm,
1506 SourceLocation loc,
1507 TemplateArgument arg) {
1508 ExprResult result;
1509
1510 // Determine the substituted parameter type. We can usually infer this from
1511 // the template argument, but not always.
1512 auto SubstParamType = [&] {
1513 QualType T;
1514 if (parm->isExpandedParameterPack())
1515 T = parm->getExpansionType(SemaRef.ArgumentPackSubstitutionIndex);
1516 else
1517 T = parm->getType();
1518 if (parm->isParameterPack() && isa<PackExpansionType>(T))
1519 T = cast<PackExpansionType>(T)->getPattern();
1520 return SemaRef.SubstType(T, TemplateArgs, loc, parm->getDeclName());
1521 };
1522
1523 bool refParam = false;
1524
1525 // The template argument itself might be an expression, in which case we just
1526 // return that expression. This happens when substituting into an alias
1527 // template.
1528 if (arg.getKind() == TemplateArgument::Expression) {
1529 Expr *argExpr = arg.getAsExpr();
1530 result = argExpr;
1531 if (argExpr->isLValue()) {
1532 if (argExpr->getType()->isRecordType()) {
1533 // Check whether the parameter was actually a reference.
1534 QualType paramType = SubstParamType();
1535 if (paramType.isNull())
1536 return ExprError();
1537 refParam = paramType->isReferenceType();
1538 } else {
1539 refParam = true;
1540 }
1541 }
1542 } else if (arg.getKind() == TemplateArgument::Declaration ||
1543 arg.getKind() == TemplateArgument::NullPtr) {
1544 ValueDecl *VD;
1545 if (arg.getKind() == TemplateArgument::Declaration) {
1546 VD = arg.getAsDecl();
1547
1548 // Find the instantiation of the template argument. This is
1549 // required for nested templates.
1550 VD = cast_or_null<ValueDecl>(
1551 getSema().FindInstantiatedDecl(loc, VD, TemplateArgs));
1552 if (!VD)
1553 return ExprError();
1554 } else {
1555 // Propagate NULL template argument.
1556 VD = nullptr;
1557 }
1558
1559 QualType paramType = VD ? arg.getParamTypeForDecl() : arg.getNullPtrType();
1560 assert(!paramType.isNull() && "type substitution failed for param type")((!paramType.isNull() && "type substitution failed for param type"
) ? static_cast<void> (0) : __assert_fail ("!paramType.isNull() && \"type substitution failed for param type\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1560, __PRETTY_FUNCTION__))
;
1561 assert(!paramType->isDependentType() && "param type still dependent")((!paramType->isDependentType() && "param type still dependent"
) ? static_cast<void> (0) : __assert_fail ("!paramType->isDependentType() && \"param type still dependent\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1561, __PRETTY_FUNCTION__))
;
1562 result = SemaRef.BuildExpressionFromDeclTemplateArgument(arg, paramType, loc);
1563 refParam = paramType->isReferenceType();
1564 } else {
1565 result = SemaRef.BuildExpressionFromIntegralTemplateArgument(arg, loc);
1566 assert(result.isInvalid() ||((result.isInvalid() || SemaRef.Context.hasSameType(result.get
()->getType(), arg.getIntegralType())) ? static_cast<void
> (0) : __assert_fail ("result.isInvalid() || SemaRef.Context.hasSameType(result.get()->getType(), arg.getIntegralType())"
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1568, __PRETTY_FUNCTION__))
1567 SemaRef.Context.hasSameType(result.get()->getType(),((result.isInvalid() || SemaRef.Context.hasSameType(result.get
()->getType(), arg.getIntegralType())) ? static_cast<void
> (0) : __assert_fail ("result.isInvalid() || SemaRef.Context.hasSameType(result.get()->getType(), arg.getIntegralType())"
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1568, __PRETTY_FUNCTION__))
1568 arg.getIntegralType()))((result.isInvalid() || SemaRef.Context.hasSameType(result.get
()->getType(), arg.getIntegralType())) ? static_cast<void
> (0) : __assert_fail ("result.isInvalid() || SemaRef.Context.hasSameType(result.get()->getType(), arg.getIntegralType())"
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1568, __PRETTY_FUNCTION__))
;
1569 }
1570
1571 if (result.isInvalid())
1572 return ExprError();
1573
1574 Expr *resultExpr = result.get();
1575 return new (SemaRef.Context) SubstNonTypeTemplateParmExpr(
1576 resultExpr->getType(), resultExpr->getValueKind(), loc, parm, refParam,
1577 resultExpr);
1578}
1579
1580ExprResult
1581TemplateInstantiator::TransformSubstNonTypeTemplateParmPackExpr(
1582 SubstNonTypeTemplateParmPackExpr *E) {
1583 if (getSema().ArgumentPackSubstitutionIndex == -1) {
1584 // We aren't expanding the parameter pack, so just return ourselves.
1585 return E;
1586 }
1587
1588 TemplateArgument Arg = E->getArgumentPack();
1589 Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
1590 return transformNonTypeTemplateParmRef(E->getParameterPack(),
1591 E->getParameterPackLocation(),
1592 Arg);
1593}
1594
1595ExprResult
1596TemplateInstantiator::TransformSubstNonTypeTemplateParmExpr(
1597 SubstNonTypeTemplateParmExpr *E) {
1598 ExprResult SubstReplacement = E->getReplacement();
1599 if (!isa<ConstantExpr>(SubstReplacement.get()))
1600 SubstReplacement = TransformExpr(E->getReplacement());
1601 if (SubstReplacement.isInvalid())
1602 return true;
1603 QualType SubstType = TransformType(E->getParameterType(getSema().Context));
1604 if (SubstType.isNull())
1605 return true;
1606 // The type may have been previously dependent and not now, which means we
1607 // might have to implicit cast the argument to the new type, for example:
1608 // template<auto T, decltype(T) U>
1609 // concept C = sizeof(U) == 4;
1610 // void foo() requires C<2, 'a'> { }
1611 // When normalizing foo(), we first form the normalized constraints of C:
1612 // AtomicExpr(sizeof(U) == 4,
1613 // U=SubstNonTypeTemplateParmExpr(Param=U,
1614 // Expr=DeclRef(U),
1615 // Type=decltype(T)))
1616 // Then we substitute T = 2, U = 'a' into the parameter mapping, and need to
1617 // produce:
1618 // AtomicExpr(sizeof(U) == 4,
1619 // U=SubstNonTypeTemplateParmExpr(Param=U,
1620 // Expr=ImpCast(
1621 // decltype(2),
1622 // SubstNTTPE(Param=U, Expr='a',
1623 // Type=char)),
1624 // Type=decltype(2)))
1625 // The call to CheckTemplateArgument here produces the ImpCast.
1626 TemplateArgument Converted;
1627 if (SemaRef.CheckTemplateArgument(E->getParameter(), SubstType,
1628 SubstReplacement.get(),
1629 Converted).isInvalid())
1630 return true;
1631 return transformNonTypeTemplateParmRef(E->getParameter(),
1632 E->getExprLoc(), Converted);
1633}
1634
1635ExprResult TemplateInstantiator::RebuildVarDeclRefExpr(VarDecl *PD,
1636 SourceLocation Loc) {
1637 DeclarationNameInfo NameInfo(PD->getDeclName(), Loc);
1638 return getSema().BuildDeclarationNameExpr(CXXScopeSpec(), NameInfo, PD);
1639}
1640
1641ExprResult
1642TemplateInstantiator::TransformFunctionParmPackExpr(FunctionParmPackExpr *E) {
1643 if (getSema().ArgumentPackSubstitutionIndex != -1) {
1644 // We can expand this parameter pack now.
1645 VarDecl *D = E->getExpansion(getSema().ArgumentPackSubstitutionIndex);
1646 VarDecl *VD = cast_or_null<VarDecl>(TransformDecl(E->getExprLoc(), D));
1647 if (!VD)
1648 return ExprError();
1649 return RebuildVarDeclRefExpr(VD, E->getExprLoc());
1650 }
1651
1652 QualType T = TransformType(E->getType());
1653 if (T.isNull())
1654 return ExprError();
1655
1656 // Transform each of the parameter expansions into the corresponding
1657 // parameters in the instantiation of the function decl.
1658 SmallVector<VarDecl *, 8> Vars;
1659 Vars.reserve(E->getNumExpansions());
1660 for (FunctionParmPackExpr::iterator I = E->begin(), End = E->end();
1661 I != End; ++I) {
1662 VarDecl *D = cast_or_null<VarDecl>(TransformDecl(E->getExprLoc(), *I));
1663 if (!D)
1664 return ExprError();
1665 Vars.push_back(D);
1666 }
1667
1668 auto *PackExpr =
1669 FunctionParmPackExpr::Create(getSema().Context, T, E->getParameterPack(),
1670 E->getParameterPackLocation(), Vars);
1671 getSema().MarkFunctionParmPackReferenced(PackExpr);
1672 return PackExpr;
1673}
1674
1675ExprResult
1676TemplateInstantiator::TransformFunctionParmPackRefExpr(DeclRefExpr *E,
1677 VarDecl *PD) {
1678 typedef LocalInstantiationScope::DeclArgumentPack DeclArgumentPack;
1679 llvm::PointerUnion<Decl *, DeclArgumentPack *> *Found
1680 = getSema().CurrentInstantiationScope->findInstantiationOf(PD);
1681 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1681, __PRETTY_FUNCTION__))
;
1682
1683 Decl *TransformedDecl;
1684 if (DeclArgumentPack *Pack = Found->dyn_cast<DeclArgumentPack *>()) {
1685 // If this is a reference to a function parameter pack which we can
1686 // substitute but can't yet expand, build a FunctionParmPackExpr for it.
1687 if (getSema().ArgumentPackSubstitutionIndex == -1) {
1688 QualType T = TransformType(E->getType());
1689 if (T.isNull())
1690 return ExprError();
1691 auto *PackExpr = FunctionParmPackExpr::Create(getSema().Context, T, PD,
1692 E->getExprLoc(), *Pack);
1693 getSema().MarkFunctionParmPackReferenced(PackExpr);
1694 return PackExpr;
1695 }
1696
1697 TransformedDecl = (*Pack)[getSema().ArgumentPackSubstitutionIndex];
1698 } else {
1699 TransformedDecl = Found->get<Decl*>();
1700 }
1701
1702 // We have either an unexpanded pack or a specific expansion.
1703 return RebuildVarDeclRefExpr(cast<VarDecl>(TransformedDecl), E->getExprLoc());
1704}
1705
1706ExprResult
1707TemplateInstantiator::TransformDeclRefExpr(DeclRefExpr *E) {
1708 NamedDecl *D = E->getDecl();
1709
1710 // Handle references to non-type template parameters and non-type template
1711 // parameter packs.
1712 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(D)) {
1713 if (NTTP->getDepth() < TemplateArgs.getNumLevels())
1714 return TransformTemplateParmRefExpr(E, NTTP);
1715
1716 // We have a non-type template parameter that isn't fully substituted;
1717 // FindInstantiatedDecl will find it in the local instantiation scope.
1718 }
1719
1720 // Handle references to function parameter packs.
1721 if (VarDecl *PD = dyn_cast<VarDecl>(D))
1722 if (PD->isParameterPack())
1723 return TransformFunctionParmPackRefExpr(E, PD);
1724
1725 return TreeTransform<TemplateInstantiator>::TransformDeclRefExpr(E);
1726}
1727
1728ExprResult TemplateInstantiator::TransformCXXDefaultArgExpr(
1729 CXXDefaultArgExpr *E) {
1730 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1732, __PRETTY_FUNCTION__))
1731 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1732, __PRETTY_FUNCTION__))
1732 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1732, __PRETTY_FUNCTION__))
;
1733 return SemaRef.BuildCXXDefaultArgExpr(E->getUsedLocation(),
1734 cast<FunctionDecl>(E->getParam()->getDeclContext()),
1735 E->getParam());
1736}
1737
1738template<typename Fn>
1739QualType TemplateInstantiator::TransformFunctionProtoType(TypeLocBuilder &TLB,
1740 FunctionProtoTypeLoc TL,
1741 CXXRecordDecl *ThisContext,
1742 Qualifiers ThisTypeQuals,
1743 Fn TransformExceptionSpec) {
1744 // We need a local instantiation scope for this function prototype.
1745 LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true);
1746 return inherited::TransformFunctionProtoType(
1747 TLB, TL, ThisContext, ThisTypeQuals, TransformExceptionSpec);
1748}
1749
1750ParmVarDecl *
1751TemplateInstantiator::TransformFunctionTypeParam(ParmVarDecl *OldParm,
1752 int indexAdjustment,
1753 Optional<unsigned> NumExpansions,
1754 bool ExpectParameterPack) {
1755 auto NewParm =
1756 SemaRef.SubstParmVarDecl(OldParm, TemplateArgs, indexAdjustment,
1757 NumExpansions, ExpectParameterPack);
1758 if (NewParm && SemaRef.getLangOpts().OpenCL)
1759 SemaRef.deduceOpenCLAddressSpace(NewParm);
1760 return NewParm;
1761}
1762
1763QualType
1764TemplateInstantiator::TransformTemplateTypeParmType(TypeLocBuilder &TLB,
1765 TemplateTypeParmTypeLoc TL) {
1766 const TemplateTypeParmType *T = TL.getTypePtr();
1767 if (T->getDepth() < TemplateArgs.getNumLevels()) {
1768 // Replace the template type parameter with its corresponding
1769 // template argument.
1770
1771 // If the corresponding template argument is NULL or doesn't exist, it's
1772 // because we are performing instantiation from explicitly-specified
1773 // template arguments in a function template class, but there were some
1774 // arguments left unspecified.
1775 if (!TemplateArgs.hasTemplateArgument(T->getDepth(), T->getIndex())) {
1776 TemplateTypeParmTypeLoc NewTL
1777 = TLB.push<TemplateTypeParmTypeLoc>(TL.getType());
1778 NewTL.setNameLoc(TL.getNameLoc());
1779 return TL.getType();
1780 }
1781
1782 TemplateArgument Arg = TemplateArgs(T->getDepth(), T->getIndex());
1783
1784 if (TemplateArgs.isRewrite()) {
1785 // We're rewriting the template parameter as a reference to another
1786 // template parameter.
1787 if (Arg.getKind() == TemplateArgument::Pack) {
1788 assert(Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() &&((Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion
() && "unexpected pack arguments in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() && \"unexpected pack arguments in template rewrite\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1789, __PRETTY_FUNCTION__))
1789 "unexpected pack arguments in template rewrite")((Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion
() && "unexpected pack arguments in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() && \"unexpected pack arguments in template rewrite\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1789, __PRETTY_FUNCTION__))
;
1790 Arg = Arg.pack_begin()->getPackExpansionPattern();
1791 }
1792 assert(Arg.getKind() == TemplateArgument::Type &&((Arg.getKind() == TemplateArgument::Type && "unexpected nontype template argument kind in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Type && \"unexpected nontype template argument kind in template rewrite\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1793, __PRETTY_FUNCTION__))
1793 "unexpected nontype template argument kind in template rewrite")((Arg.getKind() == TemplateArgument::Type && "unexpected nontype template argument kind in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Type && \"unexpected nontype template argument kind in template rewrite\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1793, __PRETTY_FUNCTION__))
;
1794 QualType NewT = Arg.getAsType();
1795 assert(isa<TemplateTypeParmType>(NewT) &&((isa<TemplateTypeParmType>(NewT) && "type parm not rewritten to type parm"
) ? static_cast<void> (0) : __assert_fail ("isa<TemplateTypeParmType>(NewT) && \"type parm not rewritten to type parm\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1796, __PRETTY_FUNCTION__))
1796 "type parm not rewritten to type parm")((isa<TemplateTypeParmType>(NewT) && "type parm not rewritten to type parm"
) ? static_cast<void> (0) : __assert_fail ("isa<TemplateTypeParmType>(NewT) && \"type parm not rewritten to type parm\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1796, __PRETTY_FUNCTION__))
;
1797 auto NewTL = TLB.push<TemplateTypeParmTypeLoc>(NewT);
1798 NewTL.setNameLoc(TL.getNameLoc());
1799 return NewT;
1800 }
1801
1802 if (T->isParameterPack()) {
1803 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1804, __PRETTY_FUNCTION__))
1804 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1804, __PRETTY_FUNCTION__))
;
1805
1806 if (getSema().ArgumentPackSubstitutionIndex == -1) {
1807 // We have the template argument pack, but we're not expanding the
1808 // enclosing pack expansion yet. Just save the template argument
1809 // pack for later substitution.
1810 QualType Result
1811 = getSema().Context.getSubstTemplateTypeParmPackType(T, Arg);
1812 SubstTemplateTypeParmPackTypeLoc NewTL
1813 = TLB.push<SubstTemplateTypeParmPackTypeLoc>(Result);
1814 NewTL.setNameLoc(TL.getNameLoc());
1815 return Result;
1816 }
1817
1818 Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
1819 }
1820
1821 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1822, __PRETTY_FUNCTION__))
1822 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1822, __PRETTY_FUNCTION__))
;
1823
1824 QualType Replacement = Arg.getAsType();
1825
1826 // TODO: only do this uniquing once, at the start of instantiation.
1827 QualType Result
1828 = getSema().Context.getSubstTemplateTypeParmType(T, Replacement);
1829 SubstTemplateTypeParmTypeLoc NewTL
1830 = TLB.push<SubstTemplateTypeParmTypeLoc>(Result);
1831 NewTL.setNameLoc(TL.getNameLoc());
1832 return Result;
1833 }
1834
1835 // The template type parameter comes from an inner template (e.g.,
1836 // the template parameter list of a member template inside the
1837 // template we are instantiating). Create a new template type
1838 // parameter with the template "level" reduced by one.
1839 TemplateTypeParmDecl *NewTTPDecl = nullptr;
1840 if (TemplateTypeParmDecl *OldTTPDecl = T->getDecl())
1841 NewTTPDecl = cast_or_null<TemplateTypeParmDecl>(
1842 TransformDecl(TL.getNameLoc(), OldTTPDecl));
1843
1844 QualType Result = getSema().Context.getTemplateTypeParmType(
1845 T->getDepth() - TemplateArgs.getNumSubstitutedLevels(), T->getIndex(),
1846 T->isParameterPack(), NewTTPDecl);
1847 TemplateTypeParmTypeLoc NewTL = TLB.push<TemplateTypeParmTypeLoc>(Result);
1848 NewTL.setNameLoc(TL.getNameLoc());
1849 return Result;
1850}
1851
1852QualType
1853TemplateInstantiator::TransformSubstTemplateTypeParmPackType(
1854 TypeLocBuilder &TLB,
1855 SubstTemplateTypeParmPackTypeLoc TL) {
1856 if (getSema().ArgumentPackSubstitutionIndex == -1) {
1857 // We aren't expanding the parameter pack, so just return ourselves.
1858 SubstTemplateTypeParmPackTypeLoc NewTL
1859 = TLB.push<SubstTemplateTypeParmPackTypeLoc>(TL.getType());
1860 NewTL.setNameLoc(TL.getNameLoc());
1861 return TL.getType();
1862 }
1863
1864 TemplateArgument Arg = TL.getTypePtr()->getArgumentPack();
1865 Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
1866 QualType Result = Arg.getAsType();
1867
1868 Result = getSema().Context.getSubstTemplateTypeParmType(
1869 TL.getTypePtr()->getReplacedParameter(),
1870 Result);
1871 SubstTemplateTypeParmTypeLoc NewTL
1872 = TLB.push<SubstTemplateTypeParmTypeLoc>(Result);
1873 NewTL.setNameLoc(TL.getNameLoc());
1874 return Result;
1875}
1876
1877template<typename EntityPrinter>
1878static concepts::Requirement::SubstitutionDiagnostic *
1879createSubstDiag(Sema &S, TemplateDeductionInfo &Info, EntityPrinter Printer) {
1880 SmallString<128> Message;
1881 SourceLocation ErrorLoc;
1882 if (Info.hasSFINAEDiagnostic()) {
1883 PartialDiagnosticAt PDA(SourceLocation(),
1884 PartialDiagnostic::NullDiagnostic{});
1885 Info.takeSFINAEDiagnostic(PDA);
1886 PDA.second.EmitToString(S.getDiagnostics(), Message);
1887 ErrorLoc = PDA.first;
1888 } else {
1889 ErrorLoc = Info.getLocation();
1890 }
1891 char *MessageBuf = new (S.Context) char[Message.size()];
1892 std::copy(Message.begin(), Message.end(), MessageBuf);
1893 SmallString<128> Entity;
1894 llvm::raw_svector_ostream OS(Entity);
1895 Printer(OS);
1896 char *EntityBuf = new (S.Context) char[Entity.size()];
1897 std::copy(Entity.begin(), Entity.end(), EntityBuf);
1898 return new (S.Context) concepts::Requirement::SubstitutionDiagnostic{
1899 StringRef(EntityBuf, Entity.size()), ErrorLoc,
1900 StringRef(MessageBuf, Message.size())};
1901}
1902
1903concepts::TypeRequirement *
1904TemplateInstantiator::TransformTypeRequirement(concepts::TypeRequirement *Req) {
1905 if (!Req->isDependent() && !AlwaysRebuild())
1906 return Req;
1907 if (Req->isSubstitutionFailure()) {
1908 if (AlwaysRebuild())
1909 return RebuildTypeRequirement(
1910 Req->getSubstitutionDiagnostic());
1911 return Req;
1912 }
1913
1914 Sema::SFINAETrap Trap(SemaRef);
1915 TemplateDeductionInfo Info(Req->getType()->getTypeLoc().getBeginLoc());
1916 Sema::InstantiatingTemplate TypeInst(SemaRef,
1917 Req->getType()->getTypeLoc().getBeginLoc(), Req, Info,
1918 Req->getType()->getTypeLoc().getSourceRange());
1919 if (TypeInst.isInvalid())
1920 return nullptr;
1921 TypeSourceInfo *TransType = TransformType(Req->getType());
1922 if (!TransType || Trap.hasErrorOccurred())
1923 return RebuildTypeRequirement(createSubstDiag(SemaRef, Info,
1924 [&] (llvm::raw_ostream& OS) {
1925 Req->getType()->getType().print(OS, SemaRef.getPrintingPolicy());
1926 }));
1927 return RebuildTypeRequirement(TransType);
1928}
1929
1930concepts::ExprRequirement *
1931TemplateInstantiator::TransformExprRequirement(concepts::ExprRequirement *Req) {
1932 if (!Req->isDependent() && !AlwaysRebuild())
1933 return Req;
1934
1935 Sema::SFINAETrap Trap(SemaRef);
1936 TemplateDeductionInfo Info(Req->getExpr()->getBeginLoc());
1937
1938 llvm::PointerUnion<Expr *, concepts::Requirement::SubstitutionDiagnostic *>
1939 TransExpr;
1940 if (Req->isExprSubstitutionFailure())
1941 TransExpr = Req->getExprSubstitutionDiagnostic();
1942 else {
1943 Sema::InstantiatingTemplate ExprInst(SemaRef, Req->getExpr()->getBeginLoc(),
1944 Req, Info,
1945 Req->getExpr()->getSourceRange());
1946 if (ExprInst.isInvalid())
1947 return nullptr;
1948 ExprResult TransExprRes = TransformExpr(Req->getExpr());
1949 if (TransExprRes.isInvalid() || Trap.hasErrorOccurred())
1950 TransExpr = createSubstDiag(SemaRef, Info,
1951 [&] (llvm::raw_ostream& OS) {
1952 Req->getExpr()->printPretty(OS, nullptr,
1953 SemaRef.getPrintingPolicy());
1954 });
1955 else
1956 TransExpr = TransExprRes.get();
1957 }
1958
1959 llvm::Optional<concepts::ExprRequirement::ReturnTypeRequirement> TransRetReq;
1960 const auto &RetReq = Req->getReturnTypeRequirement();
1961 if (RetReq.isEmpty())
1962 TransRetReq.emplace();
1963 else if (RetReq.isSubstitutionFailure())
1964 TransRetReq.emplace(RetReq.getSubstitutionDiagnostic());
1965 else if (RetReq.isTypeConstraint()) {
1966 TemplateParameterList *OrigTPL =
1967 RetReq.getTypeConstraintTemplateParameterList();
1968 Sema::InstantiatingTemplate TPLInst(SemaRef, OrigTPL->getTemplateLoc(),
1969 Req, Info, OrigTPL->getSourceRange());
1970 if (TPLInst.isInvalid())
1971 return nullptr;
1972 TemplateParameterList *TPL =
1973 TransformTemplateParameterList(OrigTPL);
1974 if (!TPL)
1975 TransRetReq.emplace(createSubstDiag(SemaRef, Info,
1976 [&] (llvm::raw_ostream& OS) {
1977 RetReq.getTypeConstraint()->getImmediatelyDeclaredConstraint()
1978 ->printPretty(OS, nullptr, SemaRef.getPrintingPolicy());
1979 }));
1980 else {
1981 TPLInst.Clear();
1982 TransRetReq.emplace(TPL);
1983 }
1984 }
1985 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1986, __PRETTY_FUNCTION__))
1986 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1986, __PRETTY_FUNCTION__))
;
1987 if (Expr *E = TransExpr.dyn_cast<Expr *>())
1988 return RebuildExprRequirement(E, Req->isSimple(), Req->getNoexceptLoc(),
1989 std::move(*TransRetReq));
1990 return RebuildExprRequirement(
1991 TransExpr.get<concepts::Requirement::SubstitutionDiagnostic *>(),
1992 Req->isSimple(), Req->getNoexceptLoc(), std::move(*TransRetReq));
1993}
1994
1995concepts::NestedRequirement *
1996TemplateInstantiator::TransformNestedRequirement(
1997 concepts::NestedRequirement *Req) {
1998 if (!Req->isDependent() && !AlwaysRebuild())
1999 return Req;
2000 if (Req->isSubstitutionFailure()) {
2001 if (AlwaysRebuild())
2002 return RebuildNestedRequirement(
2003 Req->getSubstitutionDiagnostic());
2004 return Req;
2005 }
2006 Sema::InstantiatingTemplate ReqInst(SemaRef,
2007 Req->getConstraintExpr()->getBeginLoc(), Req,
2008 Sema::InstantiatingTemplate::ConstraintsCheck{},
2009 Req->getConstraintExpr()->getSourceRange());
2010
2011 ExprResult TransConstraint;
2012 TemplateDeductionInfo Info(Req->getConstraintExpr()->getBeginLoc());
2013 {
2014 EnterExpressionEvaluationContext ContextRAII(
2015 SemaRef, Sema::ExpressionEvaluationContext::ConstantEvaluated);
2016 Sema::SFINAETrap Trap(SemaRef);
2017 Sema::InstantiatingTemplate ConstrInst(SemaRef,
2018 Req->getConstraintExpr()->getBeginLoc(), Req, Info,
2019 Req->getConstraintExpr()->getSourceRange());
2020 if (ConstrInst.isInvalid())
2021 return nullptr;
2022 TransConstraint = TransformExpr(Req->getConstraintExpr());
2023 if (TransConstraint.isInvalid() || Trap.hasErrorOccurred())
2024 return RebuildNestedRequirement(createSubstDiag(SemaRef, Info,
2025 [&] (llvm::raw_ostream& OS) {
2026 Req->getConstraintExpr()->printPretty(OS, nullptr,
2027 SemaRef.getPrintingPolicy());
2028 }));
2029 }
2030 return RebuildNestedRequirement(TransConstraint.get());
2031}
2032
2033
2034/// Perform substitution on the type T with a given set of template
2035/// arguments.
2036///
2037/// This routine substitutes the given template arguments into the
2038/// type T and produces the instantiated type.
2039///
2040/// \param T the type into which the template arguments will be
2041/// substituted. If this type is not dependent, it will be returned
2042/// immediately.
2043///
2044/// \param Args the template arguments that will be
2045/// substituted for the top-level template parameters within T.
2046///
2047/// \param Loc the location in the source code where this substitution
2048/// is being performed. It will typically be the location of the
2049/// declarator (if we're instantiating the type of some declaration)
2050/// or the location of the type in the source code (if, e.g., we're
2051/// instantiating the type of a cast expression).
2052///
2053/// \param Entity the name of the entity associated with a declaration
2054/// being instantiated (if any). May be empty to indicate that there
2055/// is no such entity (if, e.g., this is a type that occurs as part of
2056/// a cast expression) or that the entity has no name (e.g., an
2057/// unnamed function parameter).
2058///
2059/// \param AllowDeducedTST Whether a DeducedTemplateSpecializationType is
2060/// acceptable as the top level type of the result.
2061///
2062/// \returns If the instantiation succeeds, the instantiated
2063/// type. Otherwise, produces diagnostics and returns a NULL type.
2064TypeSourceInfo *Sema::SubstType(TypeSourceInfo *T,
2065 const MultiLevelTemplateArgumentList &Args,
2066 SourceLocation Loc,
2067 DeclarationName Entity,
2068 bool AllowDeducedTST) {
2069 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2071, __PRETTY_FUNCTION__))
2070 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2071, __PRETTY_FUNCTION__))
2071 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2071, __PRETTY_FUNCTION__))
;
2072
2073 if (!T->getType()->isInstantiationDependentType() &&
2074 !T->getType()->isVariablyModifiedType())
2075 return T;
2076
2077 TemplateInstantiator Instantiator(*this, Args, Loc, Entity);
2078 return AllowDeducedTST ? Instantiator.TransformTypeWithDeducedTST(T)
2079 : Instantiator.TransformType(T);
2080}
2081
2082TypeSourceInfo *Sema::SubstType(TypeLoc TL,
2083 const MultiLevelTemplateArgumentList &Args,
2084 SourceLocation Loc,
2085 DeclarationName Entity) {
2086 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2088, __PRETTY_FUNCTION__))
2087 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2088, __PRETTY_FUNCTION__))
2088 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2088, __PRETTY_FUNCTION__))
;
2089
2090 if (TL.getType().isNull())
2091 return nullptr;
2092
2093 if (!TL.getType()->isInstantiationDependentType() &&
2094 !TL.getType()->isVariablyModifiedType()) {
2095 // FIXME: Make a copy of the TypeLoc data here, so that we can
2096 // return a new TypeSourceInfo. Inefficient!
2097 TypeLocBuilder TLB;
2098 TLB.pushFullCopy(TL);
2099 return TLB.getTypeSourceInfo(Context, TL.getType());
2100 }
2101
2102 TemplateInstantiator Instantiator(*this, Args, Loc, Entity);
2103 TypeLocBuilder TLB;
2104 TLB.reserve(TL.getFullDataSize());
2105 QualType Result = Instantiator.TransformType(TLB, TL);
2106 if (Result.isNull())
2107 return nullptr;
2108
2109 return TLB.getTypeSourceInfo(Context, Result);
2110}
2111
2112/// Deprecated form of the above.
2113QualType Sema::SubstType(QualType T,
2114 const MultiLevelTemplateArgumentList &TemplateArgs,
2115 SourceLocation Loc, DeclarationName Entity) {
2116 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2118, __PRETTY_FUNCTION__))
2117 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2118, __PRETTY_FUNCTION__))
2118 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2118, __PRETTY_FUNCTION__))
;
2119
2120 // If T is not a dependent type or a variably-modified type, there
2121 // is nothing to do.
2122 if (!T->isInstantiationDependentType() && !T->isVariablyModifiedType())
2123 return T;
2124
2125 TemplateInstantiator Instantiator(*this, TemplateArgs, Loc, Entity);
2126 return Instantiator.TransformType(T);
2127}
2128
2129static bool NeedsInstantiationAsFunctionType(TypeSourceInfo *T) {
2130 if (T->getType()->isInstantiationDependentType() ||
2131 T->getType()->isVariablyModifiedType())
2132 return true;
2133
2134 TypeLoc TL = T->getTypeLoc().IgnoreParens();
2135 if (!TL.getAs<FunctionProtoTypeLoc>())
2136 return false;
2137
2138 FunctionProtoTypeLoc FP = TL.castAs<FunctionProtoTypeLoc>();
2139 for (ParmVarDecl *P : FP.getParams()) {
2140 // This must be synthesized from a typedef.
2141 if (!P) continue;
2142
2143 // If there are any parameters, a new TypeSourceInfo that refers to the
2144 // instantiated parameters must be built.
2145 return true;
2146 }
2147
2148 return false;
2149}
2150
2151/// A form of SubstType intended specifically for instantiating the
2152/// type of a FunctionDecl. Its purpose is solely to force the
2153/// instantiation of default-argument expressions and to avoid
2154/// instantiating an exception-specification.
2155TypeSourceInfo *Sema::SubstFunctionDeclType(TypeSourceInfo *T,
2156 const MultiLevelTemplateArgumentList &Args,
2157 SourceLocation Loc,
2158 DeclarationName Entity,
2159 CXXRecordDecl *ThisContext,
2160 Qualifiers ThisTypeQuals) {
2161 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2163, __PRETTY_FUNCTION__))
2162 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2163, __PRETTY_FUNCTION__))
2163 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2163, __PRETTY_FUNCTION__))
;
2164
2165 if (!NeedsInstantiationAsFunctionType(T))
2166 return T;
2167
2168 TemplateInstantiator Instantiator(*this, Args, Loc, Entity);
2169
2170 TypeLocBuilder TLB;
2171
2172 TypeLoc TL = T->getTypeLoc();
2173 TLB.reserve(TL.getFullDataSize());
2174
2175 QualType Result;
2176
2177 if (FunctionProtoTypeLoc Proto =
2178 TL.IgnoreParens().getAs<FunctionProtoTypeLoc>()) {
2179 // Instantiate the type, other than its exception specification. The
2180 // exception specification is instantiated in InitFunctionInstantiation
2181 // once we've built the FunctionDecl.
2182 // FIXME: Set the exception specification to EST_Uninstantiated here,
2183 // instead of rebuilding the function type again later.
2184 Result = Instantiator.TransformFunctionProtoType(
2185 TLB, Proto, ThisContext, ThisTypeQuals,
2186 [](FunctionProtoType::ExceptionSpecInfo &ESI,
2187 bool &Changed) { return false; });
2188 } else {
2189 Result = Instantiator.TransformType(TLB, TL);
2190 }
2191 if (Result.isNull())
2192 return nullptr;
2193
2194 return TLB.getTypeSourceInfo(Context, Result);
2195}
2196
2197bool Sema::SubstExceptionSpec(SourceLocation Loc,
2198 FunctionProtoType::ExceptionSpecInfo &ESI,
2199 SmallVectorImpl<QualType> &ExceptionStorage,
2200 const MultiLevelTemplateArgumentList &Args) {
2201 assert(ESI.Type != EST_Uninstantiated)((ESI.Type != EST_Uninstantiated) ? static_cast<void> (
0) : __assert_fail ("ESI.Type != EST_Uninstantiated", "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2201, __PRETTY_FUNCTION__))
;
2202
2203 bool Changed = false;
2204 TemplateInstantiator Instantiator(*this, Args, Loc, DeclarationName());
2205 return Instantiator.TransformExceptionSpec(Loc, ESI, ExceptionStorage,
2206 Changed);
2207}
2208
2209void Sema::SubstExceptionSpec(FunctionDecl *New, const FunctionProtoType *Proto,
2210 const MultiLevelTemplateArgumentList &Args) {
2211 FunctionProtoType::ExceptionSpecInfo ESI =
2212 Proto->getExtProtoInfo().ExceptionSpec;
2213
2214 SmallVector<QualType, 4> ExceptionStorage;
2215 if (SubstExceptionSpec(New->getTypeSourceInfo()->getTypeLoc().getEndLoc(),
2216 ESI, ExceptionStorage, Args))
2217 // On error, recover by dropping the exception specification.
2218 ESI.Type = EST_None;
2219
2220 UpdateExceptionSpec(New, ESI);
2221}
2222
2223namespace {
2224
2225 struct GetContainedInventedTypeParmVisitor :
2226 public TypeVisitor<GetContainedInventedTypeParmVisitor,
2227 TemplateTypeParmDecl *> {
2228 using TypeVisitor<GetContainedInventedTypeParmVisitor,
2229 TemplateTypeParmDecl *>::Visit;
2230
2231 TemplateTypeParmDecl *Visit(QualType T) {
2232 if (T.isNull())
2233 return nullptr;
2234 return Visit(T.getTypePtr());
2235 }
2236 // The deduced type itself.
2237 TemplateTypeParmDecl *VisitTemplateTypeParmType(
2238 const TemplateTypeParmType *T) {
2239 if (!T->getDecl() || !T->getDecl()->isImplicit())
2240 return nullptr;
2241 return T->getDecl();
2242 }
2243
2244 // Only these types can contain 'auto' types, and subsequently be replaced
2245 // by references to invented parameters.
2246
2247 TemplateTypeParmDecl *VisitElaboratedType(const ElaboratedType *T) {
2248 return Visit(T->getNamedType());
2249 }
2250
2251 TemplateTypeParmDecl *VisitPointerType(const PointerType *T) {
2252 return Visit(T->getPointeeType());
2253 }
2254
2255 TemplateTypeParmDecl *VisitBlockPointerType(const BlockPointerType *T) {
2256 return Visit(T->getPointeeType());
2257 }
2258
2259 TemplateTypeParmDecl *VisitReferenceType(const ReferenceType *T) {
2260 return Visit(T->getPointeeTypeAsWritten());
2261 }
2262
2263 TemplateTypeParmDecl *VisitMemberPointerType(const MemberPointerType *T) {
2264 return Visit(T->getPointeeType());
2265 }
2266
2267 TemplateTypeParmDecl *VisitArrayType(const ArrayType *T) {
2268 return Visit(T->getElementType());
2269 }
2270
2271 TemplateTypeParmDecl *VisitDependentSizedExtVectorType(
2272 const DependentSizedExtVectorType *T) {
2273 return Visit(T->getElementType());
2274 }
2275
2276 TemplateTypeParmDecl *VisitVectorType(const VectorType *T) {
2277 return Visit(T->getElementType());
2278 }
2279
2280 TemplateTypeParmDecl *VisitFunctionProtoType(const FunctionProtoType *T) {
2281 return VisitFunctionType(T);
2282 }
2283
2284 TemplateTypeParmDecl *VisitFunctionType(const FunctionType *T) {
2285 return Visit(T->getReturnType());
2286 }
2287
2288 TemplateTypeParmDecl *VisitParenType(const ParenType *T) {
2289 return Visit(T->getInnerType());
2290 }
2291
2292 TemplateTypeParmDecl *VisitAttributedType(const AttributedType *T) {
2293 return Visit(T->getModifiedType());
2294 }
2295
2296 TemplateTypeParmDecl *VisitMacroQualifiedType(const MacroQualifiedType *T) {
2297 return Visit(T->getUnderlyingType());
2298 }
2299
2300 TemplateTypeParmDecl *VisitAdjustedType(const AdjustedType *T) {
2301 return Visit(T->getOriginalType());
2302 }
2303
2304 TemplateTypeParmDecl *VisitPackExpansionType(const PackExpansionType *T) {
2305 return Visit(T->getPattern());
2306 }
2307 };
2308
2309} // namespace
2310
2311ParmVarDecl *Sema::SubstParmVarDecl(ParmVarDecl *OldParm,
2312 const MultiLevelTemplateArgumentList &TemplateArgs,
2313 int indexAdjustment,
2314 Optional<unsigned> NumExpansions,
2315 bool ExpectParameterPack) {
2316 TypeSourceInfo *OldDI = OldParm->getTypeSourceInfo();
2317 TypeSourceInfo *NewDI = nullptr;
2318
2319 TypeLoc OldTL = OldDI->getTypeLoc();
2320 if (PackExpansionTypeLoc ExpansionTL = OldTL.getAs<PackExpansionTypeLoc>()) {
2321
2322 // We have a function parameter pack. Substitute into the pattern of the
2323 // expansion.
2324 NewDI = SubstType(ExpansionTL.getPatternLoc(), TemplateArgs,
2325 OldParm->getLocation(), OldParm->getDeclName());
2326 if (!NewDI)
2327 return nullptr;
2328
2329 if (NewDI->getType()->containsUnexpandedParameterPack()) {
2330 // We still have unexpanded parameter packs, which means that
2331 // our function parameter is still a function parameter pack.
2332 // Therefore, make its type a pack expansion type.
2333 NewDI = CheckPackExpansion(NewDI, ExpansionTL.getEllipsisLoc(),
2334 NumExpansions);
2335 } else if (ExpectParameterPack) {
2336 // We expected to get a parameter pack but didn't (because the type
2337 // itself is not a pack expansion type), so complain. This can occur when
2338 // the substitution goes through an alias template that "loses" the
2339 // pack expansion.
2340 Diag(OldParm->getLocation(),
2341 diag::err_function_parameter_pack_without_parameter_packs)
2342 << NewDI->getType();
2343 return nullptr;
2344 }
2345 } else {
2346 NewDI = SubstType(OldDI, TemplateArgs, OldParm->getLocation(),
2347 OldParm->getDeclName());
2348 }
2349
2350 if (!NewDI)
2351 return nullptr;
2352
2353 if (NewDI->getType()->isVoidType()) {
2354 Diag(OldParm->getLocation(), diag::err_param_with_void_type);
2355 return nullptr;
2356 }
2357
2358 // In abbreviated templates, TemplateTypeParmDecls with possible
2359 // TypeConstraints are created when the parameter list is originally parsed.
2360 // The TypeConstraints can therefore reference other functions parameters in
2361 // the abbreviated function template, which is why we must instantiate them
2362 // here, when the instantiated versions of those referenced parameters are in
2363 // scope.
2364 if (TemplateTypeParmDecl *TTP =
2365 GetContainedInventedTypeParmVisitor().Visit(OldDI->getType())) {
2366 if (const TypeConstraint *TC = TTP->getTypeConstraint()) {
2367 auto *Inst = cast_or_null<TemplateTypeParmDecl>(
2368 FindInstantiatedDecl(TTP->getLocation(), TTP, TemplateArgs));
2369 // We will first get here when instantiating the abbreviated function
2370 // template's described function, but we might also get here later.
2371 // Make sure we do not instantiate the TypeConstraint more than once.
2372 if (Inst && !Inst->getTypeConstraint()) {
2373 // TODO: Concepts: do not instantiate the constraint (delayed constraint
2374 // substitution)
2375 const ASTTemplateArgumentListInfo *TemplArgInfo
2376 = TC->getTemplateArgsAsWritten();
2377 TemplateArgumentListInfo InstArgs;
2378
2379 if (TemplArgInfo) {
2380 InstArgs.setLAngleLoc(TemplArgInfo->LAngleLoc);
2381 InstArgs.setRAngleLoc(TemplArgInfo->RAngleLoc);
2382 if (Subst(TemplArgInfo->getTemplateArgs(),
2383 TemplArgInfo->NumTemplateArgs, InstArgs, TemplateArgs))
2384 return nullptr;
2385 }
2386 if (AttachTypeConstraint(
2387 TC->getNestedNameSpecifierLoc(), TC->getConceptNameInfo(),
2388 TC->getNamedConcept(), &InstArgs, Inst,
2389 TTP->isParameterPack()
2390 ? cast<CXXFoldExpr>(TC->getImmediatelyDeclaredConstraint())
2391 ->getEllipsisLoc()
2392 : SourceLocation()))
2393 return nullptr;
2394 }
2395 }
2396 }
2397
2398 ParmVarDecl *NewParm = CheckParameter(Context.getTranslationUnitDecl(),
2399 OldParm->getInnerLocStart(),
2400 OldParm->getLocation(),
2401 OldParm->getIdentifier(),
2402 NewDI->getType(), NewDI,
2403 OldParm->getStorageClass());
2404 if (!NewParm)
2405 return nullptr;
2406
2407 // Mark the (new) default argument as uninstantiated (if any).
2408 if (OldParm->hasUninstantiatedDefaultArg()) {
2409 Expr *Arg = OldParm->getUninstantiatedDefaultArg();
2410 NewParm->setUninstantiatedDefaultArg(Arg);
2411 } else if (OldParm->hasUnparsedDefaultArg()) {
2412 NewParm->setUnparsedDefaultArg();
2413 UnparsedDefaultArgInstantiations[OldParm].push_back(NewParm);
2414 } else if (Expr *Arg = OldParm->getDefaultArg()) {
2415 FunctionDecl *OwningFunc = cast<FunctionDecl>(OldParm->getDeclContext());
2416 if (OwningFunc->isInLocalScopeForInstantiation()) {
2417 // Instantiate default arguments for methods of local classes (DR1484)
2418 // and non-defining declarations.
2419 Sema::ContextRAII SavedContext(*this, OwningFunc);
2420 LocalInstantiationScope Local(*this, true);
2421 ExprResult NewArg = SubstExpr(Arg, TemplateArgs);
2422 if (NewArg.isUsable()) {
2423 // It would be nice if we still had this.
2424 SourceLocation EqualLoc = NewArg.get()->getBeginLoc();
2425 ExprResult Result =
2426 ConvertParamDefaultArgument(NewParm, NewArg.get(), EqualLoc);
2427 if (Result.isInvalid())
2428 return nullptr;
2429
2430 SetParamDefaultArgument(NewParm, Result.getAs<Expr>(), EqualLoc);
2431 }
2432 } else {
2433 // FIXME: if we non-lazily instantiated non-dependent default args for
2434 // non-dependent parameter types we could remove a bunch of duplicate
2435 // conversion warnings for such arguments.
2436 NewParm->setUninstantiatedDefaultArg(Arg);
2437 }
2438 }
2439
2440 NewParm->setHasInheritedDefaultArg(OldParm->hasInheritedDefaultArg());
2441
2442 if (OldParm->isParameterPack() && !NewParm->isParameterPack()) {
2443 // Add the new parameter to the instantiated parameter pack.
2444 CurrentInstantiationScope->InstantiatedLocalPackArg(OldParm, NewParm);
2445 } else {
2446 // Introduce an Old -> New mapping
2447 CurrentInstantiationScope->InstantiatedLocal(OldParm, NewParm);
2448 }
2449
2450 // FIXME: OldParm may come from a FunctionProtoType, in which case CurContext
2451 // can be anything, is this right ?
2452 NewParm->setDeclContext(CurContext);
2453
2454 NewParm->setScopeInfo(OldParm->getFunctionScopeDepth(),
2455 OldParm->getFunctionScopeIndex() + indexAdjustment);
2456
2457 InstantiateAttrs(TemplateArgs, OldParm, NewParm);
2458
2459 return NewParm;
2460}
2461
2462/// Substitute the given template arguments into the given set of
2463/// parameters, producing the set of parameter types that would be generated
2464/// from such a substitution.
2465bool Sema::SubstParmTypes(
2466 SourceLocation Loc, ArrayRef<ParmVarDecl *> Params,
2467 const FunctionProtoType::ExtParameterInfo *ExtParamInfos,
2468 const MultiLevelTemplateArgumentList &TemplateArgs,
2469 SmallVectorImpl<QualType> &ParamTypes,
2470 SmallVectorImpl<ParmVarDecl *> *OutParams,
2471 ExtParameterInfoBuilder &ParamInfos) {
2472 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2474, __PRETTY_FUNCTION__))
2473 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2474, __PRETTY_FUNCTION__))
2474 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2474, __PRETTY_FUNCTION__))
;
2475
2476 TemplateInstantiator Instantiator(*this, TemplateArgs, Loc,
2477 DeclarationName());
2478 return Instantiator.TransformFunctionTypeParams(
2479 Loc, Params, nullptr, ExtParamInfos, ParamTypes, OutParams, ParamInfos);
2480}
2481
2482/// Perform substitution on the base class specifiers of the
2483/// given class template specialization.
2484///
2485/// Produces a diagnostic and returns true on error, returns false and
2486/// attaches the instantiated base classes to the class template
2487/// specialization if successful.
2488bool
2489Sema::SubstBaseSpecifiers(CXXRecordDecl *Instantiation,
2490 CXXRecordDecl *Pattern,
2491 const MultiLevelTemplateArgumentList &TemplateArgs) {
2492 bool Invalid = false;
2493 SmallVector<CXXBaseSpecifier*, 4> InstantiatedBases;
2494 for (const auto &Base : Pattern->bases()) {
2495 if (!Base.getType()->isDependentType()) {
2496 if (const CXXRecordDecl *RD = Base.getType()->getAsCXXRecordDecl()) {
2497 if (RD->isInvalidDecl())
2498 Instantiation->setInvalidDecl();
2499 }
2500 InstantiatedBases.push_back(new (Context) CXXBaseSpecifier(Base));
2501 continue;
2502 }
2503
2504 SourceLocation EllipsisLoc;
2505 TypeSourceInfo *BaseTypeLoc;
2506 if (Base.isPackExpansion()) {
2507 // This is a pack expansion. See whether we should expand it now, or
2508 // wait until later.
2509 SmallVector<UnexpandedParameterPack, 2> Unexpanded;
2510 collectUnexpandedParameterPacks(Base.getTypeSourceInfo()->getTypeLoc(),
2511 Unexpanded);
2512 bool ShouldExpand = false;
2513 bool RetainExpansion = false;
2514 Optional<unsigned> NumExpansions;
2515 if (CheckParameterPacksForExpansion(Base.getEllipsisLoc(),
2516 Base.getSourceRange(),
2517 Unexpanded,
2518 TemplateArgs, ShouldExpand,
2519 RetainExpansion,
2520 NumExpansions)) {
2521 Invalid = true;
2522 continue;
2523 }
2524
2525 // If we should expand this pack expansion now, do so.
2526 if (ShouldExpand) {
2527 for (unsigned I = 0; I != *NumExpansions; ++I) {
2528 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(*this, I);
2529
2530 TypeSourceInfo *BaseTypeLoc = SubstType(Base.getTypeSourceInfo(),
2531 TemplateArgs,
2532 Base.getSourceRange().getBegin(),
2533 DeclarationName());
2534 if (!BaseTypeLoc) {
2535 Invalid = true;
2536 continue;
2537 }
2538
2539 if (CXXBaseSpecifier *InstantiatedBase
2540 = CheckBaseSpecifier(Instantiation,
2541 Base.getSourceRange(),
2542 Base.isVirtual(),
2543 Base.getAccessSpecifierAsWritten(),
2544 BaseTypeLoc,
2545 SourceLocation()))
2546 InstantiatedBases.push_back(InstantiatedBase);
2547 else
2548 Invalid = true;
2549 }
2550
2551 continue;
2552 }
2553
2554 // The resulting base specifier will (still) be a pack expansion.
2555 EllipsisLoc = Base.getEllipsisLoc();
2556 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(*this, -1);
2557 BaseTypeLoc = SubstType(Base.getTypeSourceInfo(),
2558 TemplateArgs,
2559 Base.getSourceRange().getBegin(),
2560 DeclarationName());
2561 } else {
2562 BaseTypeLoc = SubstType(Base.getTypeSourceInfo(),
2563 TemplateArgs,
2564 Base.getSourceRange().getBegin(),
2565 DeclarationName());
2566 }
2567
2568 if (!BaseTypeLoc) {
2569 Invalid = true;
2570 continue;
2571 }
2572
2573 if (CXXBaseSpecifier *InstantiatedBase
2574 = CheckBaseSpecifier(Instantiation,
2575 Base.getSourceRange(),
2576 Base.isVirtual(),
2577 Base.getAccessSpecifierAsWritten(),
2578 BaseTypeLoc,
2579 EllipsisLoc))
2580 InstantiatedBases.push_back(InstantiatedBase);
2581 else
2582 Invalid = true;
2583 }
2584
2585 if (!Invalid && AttachBaseSpecifiers(Instantiation, InstantiatedBases))
2586 Invalid = true;
2587
2588 return Invalid;
2589}
2590
2591// Defined via #include from SemaTemplateInstantiateDecl.cpp
2592namespace clang {
2593 namespace sema {
2594 Attr *instantiateTemplateAttribute(const Attr *At, ASTContext &C, Sema &S,
2595 const MultiLevelTemplateArgumentList &TemplateArgs);
2596 Attr *instantiateTemplateAttributeForDecl(
2597 const Attr *At, ASTContext &C, Sema &S,
2598 const MultiLevelTemplateArgumentList &TemplateArgs);
2599 }
2600}
2601
2602/// Instantiate the definition of a class from a given pattern.
2603///
2604/// \param PointOfInstantiation The point of instantiation within the
2605/// source code.
2606///
2607/// \param Instantiation is the declaration whose definition is being
2608/// instantiated. This will be either a class template specialization
2609/// or a member class of a class template specialization.
2610///
2611/// \param Pattern is the pattern from which the instantiation
2612/// occurs. This will be either the declaration of a class template or
2613/// the declaration of a member class of a class template.
2614///
2615/// \param TemplateArgs The template arguments to be substituted into
2616/// the pattern.
2617///
2618/// \param TSK the kind of implicit or explicit instantiation to perform.
2619///
2620/// \param Complain whether to complain if the class cannot be instantiated due
2621/// to the lack of a definition.
2622///
2623/// \returns true if an error occurred, false otherwise.
2624bool
2625Sema::InstantiateClass(SourceLocation PointOfInstantiation,
2626 CXXRecordDecl *Instantiation, CXXRecordDecl *Pattern,
2627 const MultiLevelTemplateArgumentList &TemplateArgs,
2628 TemplateSpecializationKind TSK,
2629 bool Complain) {
2630 CXXRecordDecl *PatternDef
2631 = cast_or_null<CXXRecordDecl>(Pattern->getDefinition());
27
Assuming the object is a 'CXXRecordDecl'
2632 if (DiagnoseUninstantiableTemplate(PointOfInstantiation, Instantiation,
28
Assuming the condition is false
29
Taking false branch
2633 Instantiation->getInstantiatedFromMemberClass(),
2634 Pattern, PatternDef, TSK, Complain))
2635 return true;
2636
2637 llvm::TimeTraceScope TimeScope("InstantiateClass", [&]() {
2638 std::string Name;
2639 llvm::raw_string_ostream OS(Name);
2640 Instantiation->getNameForDiagnostic(OS, getPrintingPolicy(),
2641 /*Qualified=*/true);
2642 return Name;
2643 });
2644
2645 Pattern = PatternDef;
2646
2647 // Record the point of instantiation.
2648 if (MemberSpecializationInfo *MSInfo
30
Assuming 'MSInfo' is null
31
Taking false branch
2649 = Instantiation->getMemberSpecializationInfo()) {
2650 MSInfo->setTemplateSpecializationKind(TSK);
2651 MSInfo->setPointOfInstantiation(PointOfInstantiation);
2652 } else if (ClassTemplateSpecializationDecl *Spec
32.1
'Spec' is null
32.1
'Spec' is null
33
Taking false branch
2653 = dyn_cast<ClassTemplateSpecializationDecl>(Instantiation)) {
32
Assuming 'Instantiation' is not a 'ClassTemplateSpecializationDecl'
2654 Spec->setTemplateSpecializationKind(TSK); 2655 Spec->setPointOfInstantiation(PointOfInstantiation); 2656 } 2657 2658 InstantiatingTemplate Inst(*this, PointOfInstantiation, Instantiation);
34
Calling constructor for 'InstantiatingTemplate'
48
Returning from constructor for 'InstantiatingTemplate'
2659 if (Inst.isInvalid())
49
Calling 'InstantiatingTemplate::isInvalid'
51
Returning from 'InstantiatingTemplate::isInvalid'
52
Taking false branch
2660 return true; 2661 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2661, __PRETTY_FUNCTION__))
;
53
'?' condition is true
2662 PrettyDeclStackTraceEntry CrashInfo(Context, Instantiation, SourceLocation(), 2663 "instantiating class definition"); 2664 2665 // Enter the scope of this instantiation. We don't use 2666 // PushDeclContext because we don't have a scope. 2667 ContextRAII SavedContext(*this, Instantiation); 2668 EnterExpressionEvaluationContext EvalContext( 2669 *this, Sema::ExpressionEvaluationContext::PotentiallyEvaluated); 2670 2671 // If this is an instantiation of a local class, merge this local 2672 // instantiation scope with the enclosing scope. Otherwise, every 2673 // instantiation of a class has its own local instantiation scope. 2674 bool MergeWithParentScope = !Instantiation->isDefinedOutsideFunctionOrMethod(); 2675 LocalInstantiationScope Scope(*this, MergeWithParentScope); 2676 2677 // Some class state isn't processed immediately but delayed till class 2678 // instantiation completes. We may not be ready to handle any delayed state 2679 // already on the stack as it might correspond to a different class, so save 2680 // it now and put it back later. 2681 SavePendingParsedClassStateRAII SavedPendingParsedClassState(*this); 2682 2683 // Pull attributes from the pattern onto the instantiation. 2684 InstantiateAttrs(TemplateArgs, Pattern, Instantiation); 2685 2686 // Start the definition of this instantiation. 2687 Instantiation->startDefinition(); 2688 2689 // The instantiation is visible here, even if it was first declared in an 2690 // unimported module. 2691 Instantiation->setVisibleDespiteOwningModule(); 2692 2693 // FIXME: This loses the as-written tag kind for an explicit instantiation. 2694 Instantiation->setTagKind(Pattern->getTagKind()); 2695 2696 // Do substitution on the base class specifiers. 2697 if (SubstBaseSpecifiers(Instantiation, Pattern, TemplateArgs))
54
Taking false branch
2698 Instantiation->setInvalidDecl(); 2699 2700 TemplateDeclInstantiator Instantiator(*this, Instantiation, TemplateArgs); 2701 SmallVector<Decl*, 4> Fields; 2702 // Delay instantiation of late parsed attributes. 2703 LateInstantiatedAttrVec LateAttrs; 2704 Instantiator.enableLateAttributeInstantiation(&LateAttrs); 2705 2706 bool MightHaveConstexprVirtualFunctions = false; 2707 for (auto *Member : Pattern->decls()) { 2708 // Don't instantiate members not belonging in this semantic context. 2709 // e.g. for: 2710 // @code 2711 // template <int i> class A { 2712 // class B *g; 2713 // }; 2714 // @endcode 2715 // 'class B' has the template as lexical context but semantically it is 2716 // introduced in namespace scope. 2717 if (Member->getDeclContext() != Pattern) 2718 continue; 2719 2720 // BlockDecls can appear in a default-member-initializer. They must be the 2721 // child of a BlockExpr, so we only know how to instantiate them from there. 2722 // Similarly, lambda closure types are recreated when instantiating the 2723 // corresponding LambdaExpr. 2724 if (isa<BlockDecl>(Member) || 2725 (isa<CXXRecordDecl>(Member) && cast<CXXRecordDecl>(Member)->isLambda())) 2726 continue; 2727 2728 if (Member->isInvalidDecl()) { 2729 Instantiation->setInvalidDecl(); 2730 continue; 2731 } 2732 2733 Decl *NewMember = Instantiator.Visit(Member); 2734 if (NewMember) { 2735 if (FieldDecl *Field = dyn_cast<FieldDecl>(NewMember)) { 2736 Fields.push_back(Field); 2737 } else if (EnumDecl *Enum = dyn_cast<EnumDecl>(NewMember)) { 2738 // C++11 [temp.inst]p1: The implicit instantiation of a class template 2739 // specialization causes the implicit instantiation of the definitions 2740 // of unscoped member enumerations. 2741 // Record a point of instantiation for this implicit instantiation. 2742 if (TSK == TSK_ImplicitInstantiation && !Enum->isScoped() && 2743 Enum->isCompleteDefinition()) { 2744 MemberSpecializationInfo *MSInfo =Enum->getMemberSpecializationInfo(); 2745 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2745, __PRETTY_FUNCTION__))
; 2746 MSInfo->setTemplateSpecializationKind(TSK_ImplicitInstantiation); 2747 MSInfo->setPointOfInstantiation(PointOfInstantiation); 2748 } 2749 } else if (StaticAssertDecl *SA = dyn_cast<StaticAssertDecl>(NewMember)) { 2750 if (SA->isFailed()) { 2751 // A static_assert failed. Bail out; instantiating this 2752 // class is probably not meaningful. 2753 Instantiation->setInvalidDecl(); 2754 break; 2755 } 2756 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewMember)) { 2757 if (MD->isConstexpr() && !MD->getFriendObjectKind() && 2758 (MD->isVirtualAsWritten() || Instantiation->getNumBases())) 2759 MightHaveConstexprVirtualFunctions = true; 2760 } 2761 2762 if (NewMember->isInvalidDecl()) 2763 Instantiation->setInvalidDecl(); 2764 } else { 2765 // FIXME: Eventually, a NULL return will mean that one of the 2766 // instantiations was a semantic disaster, and we'll want to mark the 2767 // declaration invalid. 2768 // For now, we expect to skip some members that we can't yet handle. 2769 } 2770 } 2771 2772 // Finish checking fields. 2773 ActOnFields(nullptr, Instantiation->getLocation(), Instantiation, Fields, 2774 SourceLocation(), SourceLocation(), ParsedAttributesView()); 2775 CheckCompletedCXXClass(nullptr, Instantiation); 2776 2777 // Default arguments are parsed, if not instantiated. We can go instantiate 2778 // default arg exprs for default constructors if necessary now. Unless we're 2779 // parsing a class, in which case wait until that's finished. 2780 if (ParsingClassDepth == 0)
55
Assuming field 'ParsingClassDepth' is not equal to 0
56
Taking false branch
2781 ActOnFinishCXXNonNestedClass(); 2782 2783 // Instantiate late parsed attributes, and attach them to their decls. 2784 // See Sema::InstantiateAttrs 2785 for (LateInstantiatedAttrVec::iterator I = LateAttrs.begin(),
58
Loop condition is true. Entering loop body
2786 E = LateAttrs.end(); I != E; ++I) {
57
Assuming 'I' is not equal to 'E'
2787 assert(CurrentInstantiationScope == Instantiator.getStartingScope())((CurrentInstantiationScope == Instantiator.getStartingScope(
)) ? static_cast<void> (0) : __assert_fail ("CurrentInstantiationScope == Instantiator.getStartingScope()"
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2787, __PRETTY_FUNCTION__))
;
59
Assuming the condition is true
60
'?' condition is true
2788 CurrentInstantiationScope = I->Scope; 2789 2790 // Allow 'this' within late-parsed attributes. 2791 NamedDecl *ND = dyn_cast<NamedDecl>(I->NewDecl);
61
Assuming field 'NewDecl' is not a 'NamedDecl'
62
'ND' initialized to a null pointer value
2792 CXXRecordDecl *ThisContext = 2793 dyn_cast_or_null<CXXRecordDecl>(ND->getDeclContext());
63
Called C++ object pointer is null
2794 CXXThisScopeRAII ThisScope(*this, ThisContext, Qualifiers(), 2795 ND && ND->isCXXInstanceMember()); 2796 2797 Attr *NewAttr = 2798 instantiateTemplateAttribute(I->TmplAttr, Context, *this, TemplateArgs); 2799 if (NewAttr) 2800 I->NewDecl->addAttr(NewAttr); 2801 LocalInstantiationScope::deleteScopes(I->Scope, 2802 Instantiator.getStartingScope()); 2803 } 2804 Instantiator.disableLateAttributeInstantiation(); 2805 LateAttrs.clear(); 2806 2807 ActOnFinishDelayedMemberInitializers(Instantiation); 2808 2809 // FIXME: We should do something similar for explicit instantiations so they 2810 // end up in the right module. 2811 if (TSK == TSK_ImplicitInstantiation) { 2812 Instantiation->setLocation(Pattern->getLocation()); 2813 Instantiation->setLocStart(Pattern->getInnerLocStart()); 2814 Instantiation->setBraceRange(Pattern->getBraceRange()); 2815 } 2816 2817 if (!Instantiation->isInvalidDecl()) { 2818 // Perform any dependent diagnostics from the pattern. 2819 PerformDependentDiagnostics(Pattern, TemplateArgs); 2820 2821 // Instantiate any out-of-line class template partial 2822 // specializations now. 2823 for (TemplateDeclInstantiator::delayed_partial_spec_iterator 2824 P = Instantiator.delayed_partial_spec_begin(), 2825 PEnd = Instantiator.delayed_partial_spec_end(); 2826 P != PEnd; ++P) { 2827 if (!Instantiator.InstantiateClassTemplatePartialSpecialization( 2828 P->first, P->second)) { 2829 Instantiation->setInvalidDecl(); 2830 break; 2831 } 2832 } 2833 2834 // Instantiate any out-of-line variable template partial 2835 // specializations now. 2836 for (TemplateDeclInstantiator::delayed_var_partial_spec_iterator 2837 P = Instantiator.delayed_var_partial_spec_begin(), 2838 PEnd = Instantiator.delayed_var_partial_spec_end(); 2839 P != PEnd; ++P) { 2840 if (!Instantiator.InstantiateVarTemplatePartialSpecialization( 2841 P->first, P->second)) { 2842 Instantiation->setInvalidDecl(); 2843 break; 2844 } 2845 } 2846 } 2847 2848 // Exit the scope of this instantiation. 2849 SavedContext.pop(); 2850 2851 if (!Instantiation->isInvalidDecl()) { 2852 // Always emit the vtable for an explicit instantiation definition 2853 // of a polymorphic class template specialization. Otherwise, eagerly 2854 // instantiate only constexpr virtual functions in preparation for their use 2855 // in constant evaluation. 2856 if (TSK == TSK_ExplicitInstantiationDefinition) 2857 MarkVTableUsed(PointOfInstantiation, Instantiation, true); 2858 else if (MightHaveConstexprVirtualFunctions) 2859 MarkVirtualMembersReferenced(PointOfInstantiation, Instantiation, 2860 /*ConstexprOnly*/ true); 2861 } 2862 2863 Consumer.HandleTagDeclDefinition(Instantiation); 2864 2865 return Instantiation->isInvalidDecl(); 2866} 2867 2868/// Instantiate the definition of an enum from a given pattern. 2869/// 2870/// \param PointOfInstantiation The point of instantiation within the 2871/// source code. 2872/// \param Instantiation is the declaration whose definition is being 2873/// instantiated. This will be a member enumeration of a class 2874/// temploid specialization, or a local enumeration within a 2875/// function temploid specialization. 2876/// \param Pattern The templated declaration from which the instantiation 2877/// occurs. 2878/// \param TemplateArgs The template arguments to be substituted into 2879/// the pattern. 2880/// \param TSK The kind of implicit or explicit instantiation to perform. 2881/// 2882/// \return \c true if an error occurred, \c false otherwise. 2883bool Sema::InstantiateEnum(SourceLocation PointOfInstantiation, 2884 EnumDecl *Instantiation, EnumDecl *Pattern, 2885 const MultiLevelTemplateArgumentList &TemplateArgs, 2886 TemplateSpecializationKind TSK) { 2887 EnumDecl *PatternDef = Pattern->getDefinition(); 2888 if (DiagnoseUninstantiableTemplate(PointOfInstantiation, Instantiation, 2889 Instantiation->getInstantiatedFromMemberEnum(), 2890 Pattern, PatternDef, TSK,/*Complain*/true)) 2891 return true; 2892 Pattern = PatternDef; 2893 2894 // Record the point of instantiation. 2895 if (MemberSpecializationInfo *MSInfo 2896 = Instantiation->getMemberSpecializationInfo()) { 2897 MSInfo->setTemplateSpecializationKind(TSK); 2898 MSInfo->setPointOfInstantiation(PointOfInstantiation); 2899 } 2900 2901 InstantiatingTemplate Inst(*this, PointOfInstantiation, Instantiation); 2902 if (Inst.isInvalid()) 2903 return true; 2904 if (Inst.isAlreadyInstantiating()) 2905 return false; 2906 PrettyDeclStackTraceEntry CrashInfo(Context, Instantiation, SourceLocation(), 2907 "instantiating enum definition"); 2908 2909 // The instantiation is visible here, even if it was first declared in an 2910 // unimported module. 2911 Instantiation->setVisibleDespiteOwningModule(); 2912 2913 // Enter the scope of this instantiation. We don't use 2914 // PushDeclContext because we don't have a scope. 2915 ContextRAII SavedContext(*this, Instantiation); 2916 EnterExpressionEvaluationContext EvalContext( 2917 *this, Sema::ExpressionEvaluationContext::PotentiallyEvaluated); 2918 2919 LocalInstantiationScope Scope(*this, /*MergeWithParentScope*/true); 2920 2921 // Pull attributes from the pattern onto the instantiation. 2922 InstantiateAttrs(TemplateArgs, Pattern, Instantiation); 2923 2924 TemplateDeclInstantiator Instantiator(*this, Instantiation, TemplateArgs); 2925 Instantiator.InstantiateEnumDefinition(Instantiation, Pattern); 2926 2927 // Exit the scope of this instantiation. 2928 SavedContext.pop(); 2929 2930 return Instantiation->isInvalidDecl(); 2931} 2932 2933 2934/// Instantiate the definition of a field from the given pattern. 2935/// 2936/// \param PointOfInstantiation The point of instantiation within the 2937/// source code. 2938/// \param Instantiation is the declaration whose definition is being 2939/// instantiated. This will be a class of a class temploid 2940/// specialization, or a local enumeration within a function temploid 2941/// specialization. 2942/// \param Pattern The templated declaration from which the instantiation 2943/// occurs. 2944/// \param TemplateArgs The template arguments to be substituted into 2945/// the pattern. 2946/// 2947/// \return \c true if an error occurred, \c false otherwise. 2948bool Sema::InstantiateInClassInitializer( 2949 SourceLocation PointOfInstantiation, FieldDecl *Instantiation, 2950 FieldDecl *Pattern, const MultiLevelTemplateArgumentList &TemplateArgs) { 2951 // If there is no initializer, we don't need to do anything. 2952 if (!Pattern->hasInClassInitializer()) 2953 return false; 2954 2955 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2957, __PRETTY_FUNCTION__))
2956 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2957, __PRETTY_FUNCTION__))
2957 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2957, __PRETTY_FUNCTION__))
; 2958 2959 // Error out if we haven't parsed the initializer of the pattern yet because 2960 // we are waiting for the closing brace of the outer class. 2961 Expr *OldInit = Pattern->getInClassInitializer(); 2962 if (!OldInit) { 2963 RecordDecl *PatternRD = Pattern->getParent(); 2964 RecordDecl *OutermostClass = PatternRD->getOuterLexicalRecordContext(); 2965 Diag(PointOfInstantiation, 2966 diag::err_default_member_initializer_not_yet_parsed) 2967 << OutermostClass << Pattern; 2968 Diag(Pattern->getEndLoc(), 2969 diag::note_default_member_initializer_not_yet_parsed); 2970 Instantiation->setInvalidDecl(); 2971 return true; 2972 } 2973 2974 InstantiatingTemplate Inst(*this, PointOfInstantiation, Instantiation); 2975 if (Inst.isInvalid()) 2976 return true; 2977 if (Inst.isAlreadyInstantiating()) { 2978 // Error out if we hit an instantiation cycle for this initializer. 2979 Diag(PointOfInstantiation, diag::err_default_member_initializer_cycle) 2980 << Instantiation; 2981 return true; 2982 } 2983 PrettyDeclStackTraceEntry CrashInfo(Context, Instantiation, SourceLocation(), 2984 "instantiating default member init"); 2985 2986 // Enter the scope of this instantiation. We don't use PushDeclContext because 2987 // we don't have a scope. 2988 ContextRAII SavedContext(*this, Instantiation->getParent()); 2989 EnterExpressionEvaluationContext EvalContext( 2990 *this, Sema::ExpressionEvaluationContext::PotentiallyEvaluated); 2991 2992 LocalInstantiationScope Scope(*this, true); 2993 2994 // Instantiate the initializer. 2995 ActOnStartCXXInClassMemberInitializer(); 2996 CXXThisScopeRAII ThisScope(*this, Instantiation->getParent(), Qualifiers()); 2997 2998 ExprResult NewInit = SubstInitializer(OldInit, TemplateArgs, 2999 /*CXXDirectInit=*/false); 3000 Expr *Init = NewInit.get(); 3001 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3001, __PRETTY_FUNCTION__))
; 3002 ActOnFinishCXXInClassMemberInitializer( 3003 Instantiation, Init ? Init->getBeginLoc() : SourceLocation(), Init); 3004 3005 if (auto *L = getASTMutationListener()) 3006 L->DefaultMemberInitializerInstantiated(Instantiation); 3007 3008 // Return true if the in-class initializer is still missing. 3009 return !Instantiation->getInClassInitializer(); 3010} 3011 3012namespace { 3013 /// A partial specialization whose template arguments have matched 3014 /// a given template-id. 3015 struct PartialSpecMatchResult { 3016 ClassTemplatePartialSpecializationDecl *Partial; 3017 TemplateArgumentList *Args; 3018 }; 3019} 3020 3021bool Sema::usesPartialOrExplicitSpecialization( 3022 SourceLocation Loc, ClassTemplateSpecializationDecl *ClassTemplateSpec) { 3023 if (ClassTemplateSpec->getTemplateSpecializationKind() == 3024 TSK_ExplicitSpecialization) 3025 return true; 3026 3027 SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs; 3028 ClassTemplateSpec->getSpecializedTemplate() 3029 ->getPartialSpecializations(PartialSpecs); 3030 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) { 3031 TemplateDeductionInfo Info(Loc); 3032 if (!DeduceTemplateArguments(PartialSpecs[I], 3033 ClassTemplateSpec->getTemplateArgs(), Info)) 3034 return true; 3035 } 3036 3037 return false; 3038} 3039 3040/// Get the instantiation pattern to use to instantiate the definition of a 3041/// given ClassTemplateSpecializationDecl (either the pattern of the primary 3042/// template or of a partial specialization). 3043static ActionResult<CXXRecordDecl *> 3044getPatternForClassTemplateSpecialization( 3045 Sema &S, SourceLocation PointOfInstantiation, 3046 ClassTemplateSpecializationDecl *ClassTemplateSpec, 3047 TemplateSpecializationKind TSK) { 3048 Sema::InstantiatingTemplate Inst(S, PointOfInstantiation, ClassTemplateSpec); 3049 if (Inst.isInvalid()) 3050 return {/*Invalid=*/true}; 3051 if (Inst.isAlreadyInstantiating()) 3052 return {/*Invalid=*/false}; 3053 3054 llvm::PointerUnion<ClassTemplateDecl *, 3055 ClassTemplatePartialSpecializationDecl *> 3056 Specialized = ClassTemplateSpec->getSpecializedTemplateOrPartial(); 3057 if (!Specialized.is<ClassTemplatePartialSpecializationDecl *>()) { 3058 // Find best matching specialization. 3059 ClassTemplateDecl *Template = ClassTemplateSpec->getSpecializedTemplate(); 3060 3061 // C++ [temp.class.spec.match]p1: 3062 // When a class template is used in a context that requires an 3063 // instantiation of the class, it is necessary to determine 3064 // whether the instantiation is to be generated using the primary 3065 // template or one of the partial specializations. This is done by 3066 // matching the template arguments of the class template 3067 // specialization with the template argument lists of the partial 3068 // specializations. 3069 typedef PartialSpecMatchResult MatchResult; 3070 SmallVector<MatchResult, 4> Matched; 3071 SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs; 3072 Template->getPartialSpecializations(PartialSpecs); 3073 TemplateSpecCandidateSet FailedCandidates(PointOfInstantiation); 3074 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) { 3075 ClassTemplatePartialSpecializationDecl *Partial = PartialSpecs[I]; 3076 TemplateDeductionInfo Info(FailedCandidates.getLocation()); 3077 if (Sema::TemplateDeductionResult Result = S.DeduceTemplateArguments( 3078 Partial, ClassTemplateSpec->getTemplateArgs(), Info)) { 3079 // Store the failed-deduction information for use in diagnostics, later. 3080 // TODO: Actually use the failed-deduction info? 3081 FailedCandidates.addCandidate().set( 3082 DeclAccessPair::make(Template, AS_public), Partial, 3083 MakeDeductionFailureInfo(S.Context, Result, Info)); 3084 (void)Result; 3085 } else { 3086 Matched.push_back(PartialSpecMatchResult()); 3087 Matched.back().Partial = Partial; 3088 Matched.back().Args = Info.take(); 3089 } 3090 } 3091 3092 // If we're dealing with a member template where the template parameters 3093 // have been instantiated, this provides the original template parameters 3094 // from which the member template's parameters were instantiated. 3095 3096 if (Matched.size() >= 1) { 3097 SmallVectorImpl<MatchResult>::iterator Best = Matched.begin(); 3098 if (Matched.size() == 1) { 3099 // -- If exactly one matching specialization is found, the 3100 // instantiation is generated from that specialization. 3101 // We don't need to do anything for this. 3102 } else { 3103 // -- If more than one matching specialization is found, the 3104 // partial order rules (14.5.4.2) are used to determine 3105 // whether one of the specializations is more specialized 3106 // than the others. If none of the specializations is more 3107 // specialized than all of the other matching 3108 // specializations, then the use of the class template is 3109 // ambiguous and the program is ill-formed. 3110 for (SmallVectorImpl<MatchResult>::iterator P = Best + 1, 3111 PEnd = Matched.end(); 3112 P != PEnd; ++P) { 3113 if (S.getMoreSpecializedPartialSpecialization( 3114 P->Partial, Best->Partial, PointOfInstantiation) == 3115 P->Partial) 3116 Best = P; 3117 } 3118 3119 // Determine if the best partial specialization is more specialized than 3120 // the others. 3121 bool Ambiguous = false; 3122 for (SmallVectorImpl<MatchResult>::iterator P = Matched.begin(), 3123 PEnd = Matched.end(); 3124 P != PEnd; ++P) { 3125 if (P != Best && S.getMoreSpecializedPartialSpecialization( 3126 P->Partial, Best->Partial, 3127 PointOfInstantiation) != Best->Partial) { 3128 Ambiguous = true; 3129 break; 3130 } 3131 } 3132 3133 if (Ambiguous) { 3134 // Partial ordering did not produce a clear winner. Complain. 3135 Inst.Clear(); 3136 ClassTemplateSpec->setInvalidDecl(); 3137 S.Diag(PointOfInstantiation, 3138 diag::err_partial_spec_ordering_ambiguous) 3139 << ClassTemplateSpec; 3140 3141 // Print the matching partial specializations. 3142 for (SmallVectorImpl<MatchResult>::iterator P = Matched.begin(), 3143 PEnd = Matched.end(); 3144 P != PEnd; ++P) 3145 S.Diag(P->Partial->getLocation(), diag::note_partial_spec_match) 3146 << S.getTemplateArgumentBindingsText( 3147 P->Partial->getTemplateParameters(), *P->Args); 3148 3149 return {/*Invalid=*/true}; 3150 } 3151 } 3152 3153 ClassTemplateSpec->setInstantiationOf(Best->Partial, Best->Args); 3154 } else { 3155 // -- If no matches are found, the instantiation is generated 3156 // from the primary template. 3157 } 3158 } 3159 3160 CXXRecordDecl *Pattern = nullptr; 3161 Specialized = ClassTemplateSpec->getSpecializedTemplateOrPartial(); 3162 if (auto *PartialSpec = 3163 Specialized.dyn_cast<ClassTemplatePartialSpecializationDecl *>()) { 3164 // Instantiate using the best class template partial specialization. 3165 while (PartialSpec->getInstantiatedFromMember()) { 3166 // If we've found an explicit specialization of this class template, 3167 // stop here and use that as the pattern. 3168 if (PartialSpec->isMemberSpecialization()) 3169 break; 3170 3171 PartialSpec = PartialSpec->getInstantiatedFromMember(); 3172 } 3173 Pattern = PartialSpec; 3174 } else { 3175 ClassTemplateDecl *Template = ClassTemplateSpec->getSpecializedTemplate(); 3176 while (Template->getInstantiatedFromMemberTemplate()) { 3177 // If we've found an explicit specialization of this class template, 3178 // stop here and use that as the pattern. 3179 if (Template->isMemberSpecialization()) 3180 break; 3181 3182 Template = Template->getInstantiatedFromMemberTemplate(); 3183 } 3184 Pattern = Template->getTemplatedDecl(); 3185 } 3186 3187 return Pattern; 3188} 3189 3190bool Sema::InstantiateClassTemplateSpecialization( 3191 SourceLocation PointOfInstantiation, 3192 ClassTemplateSpecializationDecl *ClassTemplateSpec, 3193 TemplateSpecializationKind TSK, bool Complain) { 3194 // Perform the actual instantiation on the canonical declaration. 3195 ClassTemplateSpec = cast<ClassTemplateSpecializationDecl>( 3196 ClassTemplateSpec->getCanonicalDecl()); 3197 if (ClassTemplateSpec->isInvalidDecl()) 3198 return true; 3199 3200 ActionResult<CXXRecordDecl *> Pattern = 3201 getPatternForClassTemplateSpecialization(*this, PointOfInstantiation, 3202 ClassTemplateSpec, TSK); 3203 if (!Pattern.isUsable()) 3204 return Pattern.isInvalid(); 3205 3206 return InstantiateClass( 3207 PointOfInstantiation, ClassTemplateSpec, Pattern.get(), 3208 getTemplateInstantiationArgs(ClassTemplateSpec), TSK, Complain); 3209} 3210 3211/// Instantiates the definitions of all of the member 3212/// of the given class, which is an instantiation of a class template 3213/// or a member class of a template. 3214void 3215Sema::InstantiateClassMembers(SourceLocation PointOfInstantiation, 3216 CXXRecordDecl *Instantiation, 3217 const MultiLevelTemplateArgumentList &TemplateArgs, 3218 TemplateSpecializationKind TSK) { 3219 // FIXME: We need to notify the ASTMutationListener that we did all of these 3220 // things, in case we have an explicit instantiation definition in a PCM, a 3221 // module, or preamble, and the declaration is in an imported AST. 3222 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3226, __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
3223 (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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3226, __PRETTY_FUNCTION__))
3224 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3226, __PRETTY_FUNCTION__))
3225 (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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3226, __PRETTY_FUNCTION__))
3226 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3226, __PRETTY_FUNCTION__))
; 3227 for (auto *D : Instantiation->decls()) { 3228 bool SuppressNew = false; 3229 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
3230 if (FunctionDecl *Pattern = 3231 Function->getInstantiatedFromMemberFunction()) { 3232 3233 if (Function->hasAttr<ExcludeFromExplicitInstantiationAttr>()) 3234 continue; 3235 3236 MemberSpecializationInfo *MSInfo = 3237 Function->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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3238, __PRETTY_FUNCTION__))
; 3239 if (MSInfo->getTemplateSpecializationKind() 3240 == TSK_ExplicitSpecialization) 3241 continue; 3242 3243 if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK, 3244 Function, 3245 MSInfo->getTemplateSpecializationKind(), 3246 MSInfo->getPointOfInstantiation(), 3247 SuppressNew) || 3248 SuppressNew) 3249 continue; 3250 3251 // C++11 [temp.explicit]p8: 3252 // An explicit instantiation definition that names a class template 3253 // specialization explicitly instantiates the class template 3254 // specialization and is only an explicit instantiation definition 3255 // of members whose definition is visible at the point of 3256 // instantiation. 3257 if (TSK == TSK_ExplicitInstantiationDefinition && !Pattern->isDefined()) 3258 continue; 3259 3260 Function->setTemplateSpecializationKind(TSK, PointOfInstantiation); 3261 3262 if (Function->isDefined()) { 3263 // Let the ASTConsumer know that this function has been explicitly 3264 // instantiated now, and its linkage might have changed. 3265 Consumer.HandleTopLevelDecl(DeclGroupRef(Function)); 3266 } else if (TSK == TSK_ExplicitInstantiationDefinition) { 3267 InstantiateFunctionDefinition(PointOfInstantiation, Function); 3268 } else if (TSK == TSK_ImplicitInstantiation) { 3269 PendingLocalImplicitInstantiations.push_back( 3270 std::make_pair(Function, PointOfInstantiation)); 3271 } 3272 } 3273 } 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
3274 if (isa<VarTemplateSpecializationDecl>(Var)) 3275 continue; 3276 3277 if (Var->isStaticDataMember()) { 3278 if (Var->hasAttr<ExcludeFromExplicitInstantiationAttr>()) 3279 continue; 3280 3281 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 3282 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3282, __PRETTY_FUNCTION__))
; 3283 if (MSInfo->getTemplateSpecializationKind() 3284 == TSK_ExplicitSpecialization) 3285 continue; 3286 3287 if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK, 3288 Var, 3289 MSInfo->getTemplateSpecializationKind(), 3290 MSInfo->getPointOfInstantiation(), 3291 SuppressNew) || 3292 SuppressNew) 3293 continue; 3294 3295 if (TSK == TSK_ExplicitInstantiationDefinition) { 3296 // C++0x [temp.explicit]p8: 3297 // An explicit instantiation definition that names a class template 3298 // specialization explicitly instantiates the class template 3299 // specialization and is only an explicit instantiation definition 3300 // of members whose definition is visible at the point of 3301 // instantiation. 3302 if (!Var->getInstantiatedFromStaticDataMember()->getDefinition()) 3303 continue; 3304 3305 Var->setTemplateSpecializationKind(TSK, PointOfInstantiation); 3306 InstantiateVariableDefinition(PointOfInstantiation, Var); 3307 } else { 3308 Var->setTemplateSpecializationKind(TSK, PointOfInstantiation); 3309 } 3310 } 3311 } 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
3312 if (Record->hasAttr<ExcludeFromExplicitInstantiationAttr>())
11
Taking false branch
3313 continue; 3314 3315 // Always skip the injected-class-name, along with any 3316 // redeclarations of nested classes, since both would cause us 3317 // to try to instantiate the members of a class twice. 3318 // Skip closure types; they'll get instantiated when we instantiate 3319 // the corresponding lambda-expression. 3320 if (Record->isInjectedClassName() || Record->getPreviousDecl() ||
12
Assuming the condition is false
13
Taking false branch
3321 Record->isLambda()) 3322 continue; 3323 3324 MemberSpecializationInfo *MSInfo = Record->getMemberSpecializationInfo(); 3325 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3325, __PRETTY_FUNCTION__))
;
14
Assuming 'MSInfo' is non-null
15
'?' condition is true
3326 3327 if (MSInfo->getTemplateSpecializationKind()
16
Assuming the condition is false
17
Taking false branch
3328 == TSK_ExplicitSpecialization) 3329 continue; 3330 3331 if (Context.getTargetInfo().getTriple().isOSWindows() && 3332 TSK == TSK_ExplicitInstantiationDeclaration) { 3333 // On Windows, explicit instantiation decl of the outer class doesn't 3334 // affect the inner class. Typically extern template declarations are 3335 // used in combination with dll import/export annotations, but those 3336 // are not propagated from the outer class templates to inner classes. 3337 // Therefore, do not instantiate inner classes on this platform, so 3338 // that users don't end up with undefined symbols during linking. 3339 continue; 3340 } 3341 3342 if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK,
18
Assuming the condition is false
19
Assuming the condition is false
20
Taking false branch
3343 Record, 3344 MSInfo->getTemplateSpecializationKind(), 3345 MSInfo->getPointOfInstantiation(), 3346 SuppressNew) || 3347 SuppressNew) 3348 continue; 3349 3350 CXXRecordDecl *Pattern = Record->getInstantiatedFromMemberClass(); 3351 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3351, __PRETTY_FUNCTION__))
;
21
Assuming 'Pattern' is non-null
22
'?' condition is true
3352 3353 if (!Record->getDefinition()) {
23
Taking true branch
3354 if (!Pattern->getDefinition()) {
24
Assuming the condition is false
25
Taking false branch
3355 // C++0x [temp.explicit]p8: 3356 // An explicit instantiation definition that names a class template 3357 // specialization explicitly instantiates the class template 3358 // specialization and is only an explicit instantiation definition 3359 // of members whose definition is visible at the point of 3360 // instantiation. 3361 if (TSK == TSK_ExplicitInstantiationDeclaration) { 3362 MSInfo->setTemplateSpecializationKind(TSK); 3363 MSInfo->setPointOfInstantiation(PointOfInstantiation); 3364 } 3365 3366 continue; 3367 } 3368 3369 InstantiateClass(PointOfInstantiation, Record, Pattern,
26
Calling 'Sema::InstantiateClass'
3370 TemplateArgs, 3371 TSK); 3372 } else { 3373 if (TSK == TSK_ExplicitInstantiationDefinition && 3374 Record->getTemplateSpecializationKind() == 3375 TSK_ExplicitInstantiationDeclaration) { 3376 Record->setTemplateSpecializationKind(TSK); 3377 MarkVTableUsed(PointOfInstantiation, Record, true); 3378 } 3379 } 3380 3381 Pattern = cast_or_null<CXXRecordDecl>(Record->getDefinition()); 3382 if (Pattern) 3383 InstantiateClassMembers(PointOfInstantiation, Pattern, TemplateArgs, 3384 TSK); 3385 } else if (auto *Enum = dyn_cast<EnumDecl>(D)) { 3386 MemberSpecializationInfo *MSInfo = Enum->getMemberSpecializationInfo(); 3387 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3387, __PRETTY_FUNCTION__))
; 3388 3389 if (MSInfo->getTemplateSpecializationKind() 3390 == TSK_ExplicitSpecialization) 3391 continue; 3392 3393 if (CheckSpecializationInstantiationRedecl( 3394 PointOfInstantiation, TSK, Enum, 3395 MSInfo->getTemplateSpecializationKind(), 3396 MSInfo->getPointOfInstantiation(), SuppressNew) || 3397 SuppressNew) 3398 continue; 3399 3400 if (Enum->getDefinition()) 3401 continue; 3402 3403 EnumDecl *Pattern = Enum->getTemplateInstantiationPattern(); 3404 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3404, __PRETTY_FUNCTION__))
; 3405 3406 if (TSK == TSK_ExplicitInstantiationDefinition) { 3407 if (!Pattern->getDefinition()) 3408 continue; 3409 3410 InstantiateEnum(PointOfInstantiation, Enum, Pattern, TemplateArgs, TSK); 3411 } else { 3412 MSInfo->setTemplateSpecializationKind(TSK); 3413 MSInfo->setPointOfInstantiation(PointOfInstantiation); 3414 } 3415 } else if (auto *Field = dyn_cast<FieldDecl>(D)) { 3416 // No need to instantiate in-class initializers during explicit 3417 // instantiation. 3418 if (Field->hasInClassInitializer() && TSK == TSK_ImplicitInstantiation) { 3419 CXXRecordDecl *ClassPattern = 3420 Instantiation->getTemplateInstantiationPattern(); 3421 DeclContext::lookup_result Lookup = 3422 ClassPattern->lookup(Field->getDeclName()); 3423 FieldDecl *Pattern = cast<FieldDecl>(Lookup.front()); 3424 InstantiateInClassInitializer(PointOfInstantiation, Field, Pattern, 3425 TemplateArgs); 3426 } 3427 } 3428 } 3429} 3430 3431/// Instantiate the definitions of all of the members of the 3432/// given class template specialization, which was named as part of an 3433/// explicit instantiation. 3434void 3435Sema::InstantiateClassTemplateSpecializationMembers( 3436 SourceLocation PointOfInstantiation, 3437 ClassTemplateSpecializationDecl *ClassTemplateSpec, 3438 TemplateSpecializationKind TSK) { 3439 // C++0x [temp.explicit]p7: 3440 // An explicit instantiation that names a class template 3441 // specialization is an explicit instantion of the same kind 3442 // (declaration or definition) of each of its members (not 3443 // including members inherited from base classes) that has not 3444 // been previously explicitly specialized in the translation unit 3445 // containing the explicit instantiation, except as described 3446 // below. 3447 InstantiateClassMembers(PointOfInstantiation, ClassTemplateSpec, 3448 getTemplateInstantiationArgs(ClassTemplateSpec), 3449 TSK); 3450} 3451 3452StmtResult 3453Sema::SubstStmt(Stmt *S, const MultiLevelTemplateArgumentList &TemplateArgs) { 3454 if (!S) 3455 return S; 3456 3457 TemplateInstantiator Instantiator(*this, TemplateArgs, 3458 SourceLocation(), 3459 DeclarationName()); 3460 return Instantiator.TransformStmt(S); 3461} 3462 3463bool Sema::SubstTemplateArguments( 3464 ArrayRef<TemplateArgumentLoc> Args, 3465 const MultiLevelTemplateArgumentList &TemplateArgs, 3466 TemplateArgumentListInfo &Out) { 3467 TemplateInstantiator Instantiator(*this, TemplateArgs, 3468 SourceLocation(), 3469 DeclarationName()); 3470 return Instantiator.TransformTemplateArguments(Args.begin(), Args.end(), 3471 Out); 3472} 3473 3474ExprResult 3475Sema::SubstExpr(Expr *E, const MultiLevelTemplateArgumentList &TemplateArgs) { 3476 if (!E) 3477 return E; 3478 3479 TemplateInstantiator Instantiator(*this, TemplateArgs, 3480 SourceLocation(), 3481 DeclarationName()); 3482 return Instantiator.TransformExpr(E); 3483} 3484 3485ExprResult Sema::SubstInitializer(Expr *Init, 3486 const MultiLevelTemplateArgumentList &TemplateArgs, 3487 bool CXXDirectInit) { 3488 TemplateInstantiator Instantiator(*this, TemplateArgs, 3489 SourceLocation(), 3490 DeclarationName()); 3491 return Instantiator.TransformInitializer(Init, CXXDirectInit); 3492} 3493 3494bool Sema::SubstExprs(ArrayRef<Expr *> Exprs, bool IsCall, 3495 const MultiLevelTemplateArgumentList &TemplateArgs, 3496 SmallVectorImpl<Expr *> &Outputs) { 3497 if (Exprs.empty()) 3498 return false; 3499 3500 TemplateInstantiator Instantiator(*this, TemplateArgs, 3501 SourceLocation(), 3502 DeclarationName()); 3503 return Instantiator.TransformExprs(Exprs.data(), Exprs.size(), 3504 IsCall, Outputs); 3505} 3506 3507NestedNameSpecifierLoc 3508Sema::SubstNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS, 3509 const MultiLevelTemplateArgumentList &TemplateArgs) { 3510 if (!NNS) 3511 return NestedNameSpecifierLoc(); 3512 3513 TemplateInstantiator Instantiator(*this, TemplateArgs, NNS.getBeginLoc(), 3514 DeclarationName()); 3515 return Instantiator.TransformNestedNameSpecifierLoc(NNS); 3516} 3517 3518/// Do template substitution on declaration name info. 3519DeclarationNameInfo 3520Sema::SubstDeclarationNameInfo(const DeclarationNameInfo &NameInfo, 3521 const MultiLevelTemplateArgumentList &TemplateArgs) { 3522 TemplateInstantiator Instantiator(*this, TemplateArgs, NameInfo.getLoc(), 3523 NameInfo.getName()); 3524 return Instantiator.TransformDeclarationNameInfo(NameInfo); 3525} 3526 3527TemplateName 3528Sema::SubstTemplateName(NestedNameSpecifierLoc QualifierLoc, 3529 TemplateName Name, SourceLocation Loc, 3530 const MultiLevelTemplateArgumentList &TemplateArgs) { 3531 TemplateInstantiator Instantiator(*this, TemplateArgs, Loc, 3532 DeclarationName()); 3533 CXXScopeSpec SS; 3534 SS.Adopt(QualifierLoc); 3535 return Instantiator.TransformTemplateName(SS, Name, Loc); 3536} 3537 3538bool Sema::Subst(const TemplateArgumentLoc *Args, unsigned NumArgs, 3539 TemplateArgumentListInfo &Result, 3540 const MultiLevelTemplateArgumentList &TemplateArgs) { 3541 TemplateInstantiator Instantiator(*this, TemplateArgs, SourceLocation(), 3542 DeclarationName()); 3543 3544 return Instantiator.TransformTemplateArguments(Args, NumArgs, Result); 3545} 3546 3547static const Decl *getCanonicalParmVarDecl(const Decl *D) { 3548 // When storing ParmVarDecls in the local instantiation scope, we always 3549 // want to use the ParmVarDecl from the canonical function declaration, 3550 // since the map is then valid for any redeclaration or definition of that 3551 // function. 3552 if (const ParmVarDecl *PV = dyn_cast<ParmVarDecl>(D)) { 3553 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(PV->getDeclContext())) { 3554 unsigned i = PV->getFunctionScopeIndex(); 3555 // This parameter might be from a freestanding function type within the 3556 // function and isn't necessarily referring to one of FD's parameters. 3557 if (i < FD->getNumParams() && FD->getParamDecl(i) == PV) 3558 return FD->getCanonicalDecl()->getParamDecl(i); 3559 } 3560 } 3561 return D; 3562} 3563 3564 3565llvm::PointerUnion<Decl *, LocalInstantiationScope::DeclArgumentPack *> * 3566LocalInstantiationScope::findInstantiationOf(const Decl *D) { 3567 D = getCanonicalParmVarDecl(D); 3568 for (LocalInstantiationScope *Current = this; Current; 3569 Current = Current->Outer) { 3570 3571 // Check if we found something within this scope. 3572 const Decl *CheckD = D; 3573 do { 3574 LocalDeclsMap::iterator Found = Current->LocalDecls.find(CheckD); 3575 if (Found != Current->LocalDecls.end()) 3576 return &Found->second; 3577 3578 // If this is a tag declaration, it's possible that we need to look for 3579 // a previous declaration. 3580 if (const TagDecl *Tag = dyn_cast<TagDecl>(CheckD)) 3581 CheckD = Tag->getPreviousDecl(); 3582 else 3583 CheckD = nullptr; 3584 } while (CheckD); 3585 3586 // If we aren't combined with our outer scope, we're done. 3587 if (!Current->CombineWithOuterScope) 3588 break; 3589 } 3590 3591 // If we're performing a partial substitution during template argument 3592 // deduction, we may not have values for template parameters yet. 3593 if (isa<NonTypeTemplateParmDecl>(D) || isa<TemplateTypeParmDecl>(D) || 3594 isa<TemplateTemplateParmDecl>(D)) 3595 return nullptr; 3596 3597 // Local types referenced prior to definition may require instantiation. 3598 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D)) 3599 if (RD->isLocalClass()) 3600 return nullptr; 3601 3602 // Enumeration types referenced prior to definition may appear as a result of 3603 // error recovery. 3604 if (isa<EnumDecl>(D)) 3605 return nullptr; 3606 3607 // Materialized typedefs/type alias for implicit deduction guides may require 3608 // instantiation. 3609 if (isa<TypedefNameDecl>(D) && 3610 isa<CXXDeductionGuideDecl>(D->getDeclContext())) 3611 return nullptr; 3612 3613 // If we didn't find the decl, then we either have a sema bug, or we have a 3614 // forward reference to a label declaration. Return null to indicate that 3615 // we have an uninstantiated label. 3616 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3616, __PRETTY_FUNCTION__))
; 3617 return nullptr; 3618} 3619 3620void LocalInstantiationScope::InstantiatedLocal(const Decl *D, Decl *Inst) { 3621 D = getCanonicalParmVarDecl(D); 3622 llvm::PointerUnion<Decl *, DeclArgumentPack *> &Stored = LocalDecls[D]; 3623 if (Stored.isNull()) { 3624#ifndef NDEBUG 3625 // It should not be present in any surrounding scope either. 3626 LocalInstantiationScope *Current = this; 3627 while (Current->CombineWithOuterScope && Current->Outer) { 3628 Current = Current->Outer; 3629 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3630, __PRETTY_FUNCTION__))
3630 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3630, __PRETTY_FUNCTION__))
; 3631 } 3632#endif 3633 Stored = Inst; 3634 } else if (DeclArgumentPack *Pack = Stored.dyn_cast<DeclArgumentPack *>()) { 3635 Pack->push_back(cast<VarDecl>(Inst)); 3636 } else { 3637 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3637, __PRETTY_FUNCTION__))
; 3638 } 3639} 3640 3641void LocalInstantiationScope::InstantiatedLocalPackArg(const Decl *D, 3642 VarDecl *Inst) { 3643 D = getCanonicalParmVarDecl(D); 3644 DeclArgumentPack *Pack = LocalDecls[D].get<DeclArgumentPack *>(); 3645 Pack->push_back(Inst); 3646} 3647 3648void LocalInstantiationScope::MakeInstantiatedLocalArgPack(const Decl *D) { 3649#ifndef NDEBUG 3650 // This should be the first time we've been told about this decl. 3651 for (LocalInstantiationScope *Current = this; 3652 Current && Current->CombineWithOuterScope; Current = Current->Outer) 3653 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3654, __PRETTY_FUNCTION__))
3654 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3654, __PRETTY_FUNCTION__))
; 3655#endif 3656 3657 D = getCanonicalParmVarDecl(D); 3658 llvm::PointerUnion<Decl *, DeclArgumentPack *> &Stored = LocalDecls[D]; 3659 DeclArgumentPack *Pack = new DeclArgumentPack; 3660 Stored = Pack; 3661 ArgumentPacks.push_back(Pack); 3662} 3663 3664bool LocalInstantiationScope::isLocalPackExpansion(const Decl *D) { 3665 for (DeclArgumentPack *Pack : ArgumentPacks) 3666 if (std::find(Pack->begin(), Pack->end(), D) != Pack->end()) 3667 return true; 3668 return false; 3669} 3670 3671void LocalInstantiationScope::SetPartiallySubstitutedPack(NamedDecl *Pack, 3672 const TemplateArgument *ExplicitArgs, 3673 unsigned NumExplicitArgs) { 3674 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3675, __PRETTY_FUNCTION__))
3675 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3675, __PRETTY_FUNCTION__))
; 3676 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3678, __PRETTY_FUNCTION__))
3677 || 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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3678, __PRETTY_FUNCTION__))
3678 "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-13~++20210223111116+16ede0956cb1/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3678, __PRETTY_FUNCTION__))
; 3679 PartiallySubstitutedPack = Pack; 3680 ArgsInPartiallySubstitutedPack = ExplicitArgs; 3681 NumArgsInPartiallySubstitutedPack = NumExplicitArgs; 3682} 3683 3684NamedDecl *LocalInstantiationScope::getPartiallySubstitutedPack( 3685 const TemplateArgument **ExplicitArgs, 3686 unsigned *NumExplicitArgs) const { 3687 if (ExplicitArgs) 3688 *ExplicitArgs = nullptr; 3689 if (NumExplicitArgs) 3690 *NumExplicitArgs = 0; 3691 3692 for (const LocalInstantiationScope *Current = this; Current; 3693 Current = Current->Outer) { 3694 if (Current->PartiallySubstitutedPack) { 3695 if (ExplicitArgs) 3696 *ExplicitArgs = Current->ArgsInPartiallySubstitutedPack; 3697 if (NumExplicitArgs) 3698 *NumExplicitArgs = Current->NumArgsInPartiallySubstitutedPack; 3699 3700 return Current->PartiallySubstitutedPack; 3701 } 3702 3703 if (!Current->CombineWithOuterScope) 3704 break; 3705 } 3706 3707 return nullptr; 3708}

/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/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/ExprCXX.h"
26#include "clang/AST/ExprConcepts.h"
27#include "clang/AST/ExprObjC.h"
28#include "clang/AST/ExprOpenMP.h"
29#include "clang/AST/ExternalASTSource.h"
30#include "clang/AST/LocInfoType.h"
31#include "clang/AST/MangleNumberingContext.h"
32#include "clang/AST/NSAPI.h"
33#include "clang/AST/PrettyPrinter.h"
34#include "clang/AST/StmtCXX.h"
35#include "clang/AST/TypeLoc.h"
36#include "clang/AST/TypeOrdering.h"
37#include "clang/Basic/BitmaskEnum.h"
38#include "clang/Basic/ExpressionTraits.h"
39#include "clang/Basic/Module.h"
40#include "clang/Basic/OpenCLOptions.h"
41#include "clang/Basic/OpenMPKinds.h"
42#include "clang/Basic/PragmaKinds.h"
43#include "clang/Basic/Specifiers.h"
44#include "clang/Basic/TemplateKinds.h"
45#include "clang/Basic/TypeTraits.h"
46#include "clang/Sema/AnalysisBasedWarnings.h"
47#include "clang/Sema/CleanupInfo.h"
48#include "clang/Sema/DeclSpec.h"
49#include "clang/Sema/ExternalSemaSource.h"
50#include "clang/Sema/IdentifierResolver.h"
51#include "clang/Sema/ObjCMethodList.h"
52#include "clang/Sema/Ownership.h"
53#include "clang/Sema/Scope.h"
54#include "clang/Sema/SemaConcept.h"
55#include "clang/Sema/TypoCorrection.h"
56#include "clang/Sema/Weak.h"
57#include "llvm/ADT/ArrayRef.h"
58#include "llvm/ADT/Optional.h"
59#include "llvm/ADT/SetVector.h"
60#include "llvm/ADT/SmallBitVector.h"
61#include "llvm/ADT/SmallPtrSet.h"
62#include "llvm/ADT/SmallSet.h"
63#include "llvm/ADT/SmallVector.h"
64#include "llvm/ADT/TinyPtrVector.h"
65#include "llvm/Frontend/OpenMP/OMPConstants.h"
66#include <deque>
67#include <memory>
68#include <string>
69#include <tuple>
70#include <vector>
71
72namespace llvm {
73 class APSInt;
74 template <typename ValueT> struct DenseMapInfo;
75 template <typename ValueT, typename ValueInfoT> class DenseSet;
76 class SmallBitVector;
77 struct InlineAsmIdentifierInfo;
78}
79
80namespace clang {
81 class ADLResult;
82 class ASTConsumer;
83 class ASTContext;
84 class ASTMutationListener;
85 class ASTReader;
86 class ASTWriter;
87 class ArrayType;
88 class ParsedAttr;
89 class BindingDecl;
90 class BlockDecl;
91 class CapturedDecl;
92 class CXXBasePath;
93 class CXXBasePaths;
94 class CXXBindTemporaryExpr;
95 typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath;
96 class CXXConstructorDecl;
97 class CXXConversionDecl;
98 class CXXDeleteExpr;
99 class CXXDestructorDecl;
100 class CXXFieldCollector;
101 class CXXMemberCallExpr;
102 class CXXMethodDecl;
103 class CXXScopeSpec;
104 class CXXTemporary;
105 class CXXTryStmt;
106 class CallExpr;
107 class ClassTemplateDecl;
108 class ClassTemplatePartialSpecializationDecl;
109 class ClassTemplateSpecializationDecl;
110 class VarTemplatePartialSpecializationDecl;
111 class CodeCompleteConsumer;
112 class CodeCompletionAllocator;
113 class CodeCompletionTUInfo;
114 class CodeCompletionResult;
115 class CoroutineBodyStmt;
116 class Decl;
117 class DeclAccessPair;
118 class DeclContext;
119 class DeclRefExpr;
120 class DeclaratorDecl;
121 class DeducedTemplateArgument;
122 class DependentDiagnostic;
123 class DesignatedInitExpr;
124 class Designation;
125 class EnableIfAttr;
126 class EnumConstantDecl;
127 class Expr;
128 class ExtVectorType;
129 class FormatAttr;
130 class FriendDecl;
131 class FunctionDecl;
132 class FunctionProtoType;
133 class FunctionTemplateDecl;
134 class ImplicitConversionSequence;
135 typedef MutableArrayRef<ImplicitConversionSequence> ConversionSequenceList;
136 class InitListExpr;
137 class InitializationKind;
138 class InitializationSequence;
139 class InitializedEntity;
140 class IntegerLiteral;
141 class LabelStmt;
142 class LambdaExpr;
143 class LangOptions;
144 class LocalInstantiationScope;
145 class LookupResult;
146 class MacroInfo;
147 typedef ArrayRef<std::pair<IdentifierInfo *, SourceLocation>> ModuleIdPath;
148 class ModuleLoader;
149 class MultiLevelTemplateArgumentList;
150 class NamedDecl;
151 class ObjCCategoryDecl;
152 class ObjCCategoryImplDecl;
153 class ObjCCompatibleAliasDecl;
154 class ObjCContainerDecl;
155 class ObjCImplDecl;
156 class ObjCImplementationDecl;
157 class ObjCInterfaceDecl;
158 class ObjCIvarDecl;
159 template <class T> class ObjCList;
160 class ObjCMessageExpr;
161 class ObjCMethodDecl;
162 class ObjCPropertyDecl;
163 class ObjCProtocolDecl;
164 class OMPThreadPrivateDecl;
165 class OMPRequiresDecl;
166 class OMPDeclareReductionDecl;
167 class OMPDeclareSimdDecl;
168 class OMPClause;
169 struct OMPVarListLocTy;
170 struct OverloadCandidate;
171 enum class OverloadCandidateParamOrder : char;
172 enum OverloadCandidateRewriteKind : unsigned;
173 class OverloadCandidateSet;
174 class OverloadExpr;
175 class ParenListExpr;
176 class ParmVarDecl;
177 class Preprocessor;
178 class PseudoDestructorTypeStorage;
179 class PseudoObjectExpr;
180 class QualType;
181 class StandardConversionSequence;
182 class Stmt;
183 class StringLiteral;
184 class SwitchStmt;
185 class TemplateArgument;
186 class TemplateArgumentList;
187 class TemplateArgumentLoc;
188 class TemplateDecl;
189 class TemplateInstantiationCallback;
190 class TemplateParameterList;
191 class TemplatePartialOrderingContext;
192 class TemplateTemplateParmDecl;
193 class Token;
194 class TypeAliasDecl;
195 class TypedefDecl;
196 class TypedefNameDecl;
197 class TypeLoc;
198 class TypoCorrectionConsumer;
199 class UnqualifiedId;
200 class UnresolvedLookupExpr;
201 class UnresolvedMemberExpr;
202 class UnresolvedSetImpl;
203 class UnresolvedSetIterator;
204 class UsingDecl;
205 class UsingShadowDecl;
206 class ValueDecl;
207 class VarDecl;
208 class VarTemplateSpecializationDecl;
209 class VisibilityAttr;
210 class VisibleDeclConsumer;
211 class IndirectFieldDecl;
212 struct DeductionFailureInfo;
213 class TemplateSpecCandidateSet;
214
215namespace sema {
216 class AccessedEntity;
217 class BlockScopeInfo;
218 class Capture;
219 class CapturedRegionScopeInfo;
220 class CapturingScopeInfo;
221 class CompoundScopeInfo;
222 class DelayedDiagnostic;
223 class DelayedDiagnosticPool;
224 class FunctionScopeInfo;
225 class LambdaScopeInfo;
226 class PossiblyUnreachableDiag;
227 class SemaPPCallbacks;
228 class TemplateDeductionInfo;
229}
230
231namespace threadSafety {
232 class BeforeSet;
233 void threadSafetyCleanup(BeforeSet* Cache);
234}
235
236// FIXME: No way to easily map from TemplateTypeParmTypes to
237// TemplateTypeParmDecls, so we have this horrible PointerUnion.
238typedef std::pair<llvm::PointerUnion<const TemplateTypeParmType*, NamedDecl*>,
239 SourceLocation> UnexpandedParameterPack;
240
241/// Describes whether we've seen any nullability information for the given
242/// file.
243struct FileNullability {
244 /// The first pointer declarator (of any pointer kind) in the file that does
245 /// not have a corresponding nullability annotation.
246 SourceLocation PointerLoc;
247
248 /// The end location for the first pointer declarator in the file. Used for
249 /// placing fix-its.
250 SourceLocation PointerEndLoc;
251
252 /// Which kind of pointer declarator we saw.
253 uint8_t PointerKind;
254
255 /// Whether we saw any type nullability annotations in the given file.
256 bool SawTypeNullability = false;
257};
258
259/// A mapping from file IDs to a record of whether we've seen nullability
260/// information in that file.
261class FileNullabilityMap {
262 /// A mapping from file IDs to the nullability information for each file ID.
263 llvm::DenseMap<FileID, FileNullability> Map;
264
265 /// A single-element cache based on the file ID.
266 struct {
267 FileID File;
268 FileNullability Nullability;
269 } Cache;
270
271public:
272 FileNullability &operator[](FileID file) {
273 // Check the single-element cache.
274 if (file == Cache.File)
275 return Cache.Nullability;
276
277 // It's not in the single-element cache; flush the cache if we have one.
278 if (!Cache.File.isInvalid()) {
279 Map[Cache.File] = Cache.Nullability;
280 }
281
282 // Pull this entry into the cache.
283 Cache.File = file;
284 Cache.Nullability = Map[file];
285 return Cache.Nullability;
286 }
287};
288
289/// Keeps track of expected type during expression parsing. The type is tied to
290/// a particular token, all functions that update or consume the type take a
291/// start location of the token they are looking at as a parameter. This allows
292/// to avoid updating the type on hot paths in the parser.
293class PreferredTypeBuilder {
294public:
295 PreferredTypeBuilder() = default;
296 explicit PreferredTypeBuilder(QualType Type) : Type(Type) {}
297
298 void enterCondition(Sema &S, SourceLocation Tok);
299 void enterReturn(Sema &S, SourceLocation Tok);
300 void enterVariableInit(SourceLocation Tok, Decl *D);
301 /// Handles e.g. BaseType{ .D = Tok...
302 void enterDesignatedInitializer(SourceLocation Tok, QualType BaseType,
303 const Designation &D);
304 /// Computing a type for the function argument may require running
305 /// overloading, so we postpone its computation until it is actually needed.
306 ///
307 /// Clients should be very careful when using this funciton, as it stores a
308 /// function_ref, clients should make sure all calls to get() with the same
309 /// location happen while function_ref is alive.
310 void enterFunctionArgument(SourceLocation Tok,
311 llvm::function_ref<QualType()> ComputeType);
312
313 void enterParenExpr(SourceLocation Tok, SourceLocation LParLoc);
314 void enterUnary(Sema &S, SourceLocation Tok, tok::TokenKind OpKind,
315 SourceLocation OpLoc);
316 void enterBinary(Sema &S, SourceLocation Tok, Expr *LHS, tok::TokenKind Op);
317 void enterMemAccess(Sema &S, SourceLocation Tok, Expr *Base);
318 void enterSubscript(Sema &S, SourceLocation Tok, Expr *LHS);
319 /// Handles all type casts, including C-style cast, C++ casts, etc.
320 void enterTypeCast(SourceLocation Tok, QualType CastType);
321
322 QualType get(SourceLocation Tok) const {
323 if (Tok != ExpectedLoc)
324 return QualType();
325 if (!Type.isNull())
326 return Type;
327 if (ComputeType)
328 return ComputeType();
329 return QualType();
330 }
331
332private:
333 /// Start position of a token for which we store expected type.
334 SourceLocation ExpectedLoc;
335 /// Expected type for a token starting at ExpectedLoc.
336 QualType Type;
337 /// A function to compute expected type at ExpectedLoc. It is only considered
338 /// if Type is null.
339 llvm::function_ref<QualType()> ComputeType;
340};
341
342/// Sema - This implements semantic analysis and AST building for C.
343class Sema final {
344 Sema(const Sema &) = delete;
345 void operator=(const Sema &) = delete;
346
347 /// A key method to reduce duplicate debug info from Sema.
348 virtual void anchor();
349
350 ///Source of additional semantic information.
351 ExternalSemaSource *ExternalSource;
352
353 ///Whether Sema has generated a multiplexer and has to delete it.
354 bool isMultiplexExternalSource;
355
356 static bool mightHaveNonExternalLinkage(const DeclaratorDecl *FD);
357
358 bool isVisibleSlow(const NamedDecl *D);
359
360 /// Determine whether two declarations should be linked together, given that
361 /// the old declaration might not be visible and the new declaration might
362 /// not have external linkage.
363 bool shouldLinkPossiblyHiddenDecl(const NamedDecl *Old,
364 const NamedDecl *New) {
365 if (isVisible(Old))
366 return true;
367 // See comment in below overload for why it's safe to compute the linkage
368 // of the new declaration here.
369 if (New->isExternallyDeclarable()) {
370 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-13~++20210223111116+16ede0956cb1/clang/include/clang/Sema/Sema.h"
, 371, __PRETTY_FUNCTION__))
371 "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-13~++20210223111116+16ede0956cb1/clang/include/clang/Sema/Sema.h"
, 371, __PRETTY_FUNCTION__))
;
372 return true;
373 }
374 return false;
375 }
376 bool shouldLinkPossiblyHiddenDecl(LookupResult &Old, const NamedDecl *New);
377
378 void setupImplicitSpecialMemberType(CXXMethodDecl *SpecialMem,
379 QualType ResultTy,
380 ArrayRef<QualType> Args);
381
382public:
383 /// The maximum alignment, same as in llvm::Value. We duplicate them here
384 /// because that allows us not to duplicate the constants in clang code,
385 /// which we must to since we can't directly use the llvm constants.
386 /// The value is verified against llvm here: lib/CodeGen/CGDecl.cpp
387 ///
388 /// This is the greatest alignment value supported by load, store, and alloca
389 /// instructions, and global values.
390 static const unsigned MaxAlignmentExponent = 29;
391 static const unsigned MaximumAlignment = 1u << MaxAlignmentExponent;
392
393 typedef OpaquePtr<DeclGroupRef> DeclGroupPtrTy;
394 typedef OpaquePtr<TemplateName> TemplateTy;
395 typedef OpaquePtr<QualType> TypeTy;
396
397 OpenCLOptions OpenCLFeatures;
398 FPOptions CurFPFeatures;
399
400 const LangOptions &LangOpts;
401 Preprocessor &PP;
402 ASTContext &Context;
403 ASTConsumer &Consumer;
404 DiagnosticsEngine &Diags;
405 SourceManager &SourceMgr;
406
407 /// Flag indicating whether or not to collect detailed statistics.
408 bool CollectStats;
409
410 /// Code-completion consumer.
411 CodeCompleteConsumer *CodeCompleter;
412
413 /// CurContext - This is the current declaration context of parsing.
414 DeclContext *CurContext;
415
416 /// Generally null except when we temporarily switch decl contexts,
417 /// like in \see ActOnObjCTemporaryExitContainerContext.
418 DeclContext *OriginalLexicalContext;
419
420 /// VAListTagName - The declaration name corresponding to __va_list_tag.
421 /// This is used as part of a hack to omit that class from ADL results.
422 DeclarationName VAListTagName;
423
424 bool MSStructPragmaOn; // True when \#pragma ms_struct on
425
426 /// Controls member pointer representation format under the MS ABI.
427 LangOptions::PragmaMSPointersToMembersKind
428 MSPointerToMemberRepresentationMethod;
429
430 /// Stack of active SEH __finally scopes. Can be empty.
431 SmallVector<Scope*, 2> CurrentSEHFinally;
432
433 /// Source location for newly created implicit MSInheritanceAttrs
434 SourceLocation ImplicitMSInheritanceAttrLoc;
435
436 /// Holds TypoExprs that are created from `createDelayedTypo`. This is used by
437 /// `TransformTypos` in order to keep track of any TypoExprs that are created
438 /// recursively during typo correction and wipe them away if the correction
439 /// fails.
440 llvm::SmallVector<TypoExpr *, 2> TypoExprs;
441
442 /// pragma clang section kind
443 enum PragmaClangSectionKind {
444 PCSK_Invalid = 0,
445 PCSK_BSS = 1,
446 PCSK_Data = 2,
447 PCSK_Rodata = 3,
448 PCSK_Text = 4,
449 PCSK_Relro = 5
450 };
451
452 enum PragmaClangSectionAction {
453 PCSA_Set = 0,
454 PCSA_Clear = 1
455 };
456
457 struct PragmaClangSection {
458 std::string SectionName;
459 bool Valid = false;
460 SourceLocation PragmaLocation;
461 };
462
463 PragmaClangSection PragmaClangBSSSection;
464 PragmaClangSection PragmaClangDataSection;
465 PragmaClangSection PragmaClangRodataSection;
466 PragmaClangSection PragmaClangRelroSection;
467 PragmaClangSection PragmaClangTextSection;
468
469 enum PragmaMsStackAction {
470 PSK_Reset = 0x0, // #pragma ()
471 PSK_Set = 0x1, // #pragma (value)
472 PSK_Push = 0x2, // #pragma (push[, id])
473 PSK_Pop = 0x4, // #pragma (pop[, id])
474 PSK_Show = 0x8, // #pragma (show) -- only for "pack"!
475 PSK_Push_Set = PSK_Push | PSK_Set, // #pragma (push[, id], value)
476 PSK_Pop_Set = PSK_Pop | PSK_Set, // #pragma (pop[, id], value)
477 };
478
479 // #pragma pack and align.
480 class AlignPackInfo {
481 public:
482 // `Native` represents default align mode, which may vary based on the
483 // platform.
484 enum Mode : unsigned char { Native, Natural, Packed, Mac68k };
485
486 // #pragma pack info constructor
487 AlignPackInfo(AlignPackInfo::Mode M, unsigned Num, bool IsXL)
488 : PackAttr(true), AlignMode(M), PackNumber(Num), XLStack(IsXL) {
489 assert(Num == PackNumber && "The pack number has been truncated.")((Num == PackNumber && "The pack number has been truncated."
) ? static_cast<void> (0) : __assert_fail ("Num == PackNumber && \"The pack number has been truncated.\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/include/clang/Sema/Sema.h"
, 489, __PRETTY_FUNCTION__))
;
490 }
491
492 // #pragma align info constructor
493 AlignPackInfo(AlignPackInfo::Mode M, bool IsXL)
494 : PackAttr(false), AlignMode(M),
495 PackNumber(M == Packed ? 1 : UninitPackVal), XLStack(IsXL) {}
496
497 explicit AlignPackInfo(bool IsXL) : AlignPackInfo(Native, IsXL) {}
498
499 AlignPackInfo() : AlignPackInfo(Native, false) {}
500
501 // When a AlignPackInfo itself cannot be used, this returns an 32-bit
502 // integer encoding for it. This should only be passed to
503 // AlignPackInfo::getFromRawEncoding, it should not be inspected directly.
504 static uint32_t getRawEncoding(const AlignPackInfo &Info) {
505 std::uint32_t Encoding{};
506 if (Info.IsXLStack())
507 Encoding |= IsXLMask;
508
509 Encoding |= static_cast<uint32_t>(Info.getAlignMode()) << 1;
510
511 if (Info.IsPackAttr())
512 Encoding |= PackAttrMask;
513
514 Encoding |= static_cast<uint32_t>(Info.getPackNumber()) << 4;
515
516 return Encoding;
517 }
518
519 static AlignPackInfo getFromRawEncoding(unsigned Encoding) {
520 bool IsXL = static_cast<bool>(Encoding & IsXLMask);
521 AlignPackInfo::Mode M =
522 static_cast<AlignPackInfo::Mode>((Encoding & AlignModeMask) >> 1);
523 int PackNumber = (Encoding & PackNumMask) >> 4;
524
525 if (Encoding & PackAttrMask)
526 return AlignPackInfo(M, PackNumber, IsXL);
527
528 return AlignPackInfo(M, IsXL);
529 }
530
531 bool IsPackAttr() const { return PackAttr; }
532
533 bool IsAlignAttr() const { return !PackAttr; }
534
535 Mode getAlignMode() const { return AlignMode; }
536
537 unsigned getPackNumber() const { return PackNumber; }
538
539 bool IsPackSet() const {
540 // #pragma align, #pragma pack(), and #pragma pack(0) do not set the pack
541 // attriute on a decl.
542 return PackNumber != UninitPackVal && PackNumber != 0;
543 }
544
545 bool IsXLStack() const { return XLStack; }
546
547 bool operator==(const AlignPackInfo &Info) const {
548 return std::tie(AlignMode, PackNumber, PackAttr, XLStack) ==
549 std::tie(Info.AlignMode, Info.PackNumber, Info.PackAttr,
550 Info.XLStack);
551 }
552
553 bool operator!=(const AlignPackInfo &Info) const {
554 return !(*this == Info);
555 }
556
557 private:
558 /// \brief True if this is a pragma pack attribute,
559 /// not a pragma align attribute.
560 bool PackAttr;
561
562 /// \brief The alignment mode that is in effect.
563 Mode AlignMode;
564
565 /// \brief The pack number of the stack.
566 unsigned char PackNumber;
567
568 /// \brief True if it is a XL #pragma align/pack stack.
569 bool XLStack;
570
571 /// \brief Uninitialized pack value.
572 static constexpr unsigned char UninitPackVal = -1;
573
574 // Masks to encode and decode an AlignPackInfo.
575 static constexpr uint32_t IsXLMask{0x0000'0001};
576 static constexpr uint32_t AlignModeMask{0x0000'0006};
577 static constexpr uint32_t PackAttrMask{0x00000'0008};
578 static constexpr uint32_t PackNumMask{0x0000'01F0};
579 };
580
581 template<typename ValueType>
582 struct PragmaStack {
583 struct Slot {
584 llvm::StringRef StackSlotLabel;
585 ValueType Value;
586 SourceLocation PragmaLocation;
587 SourceLocation PragmaPushLocation;
588 Slot(llvm::StringRef StackSlotLabel, ValueType Value,
589 SourceLocation PragmaLocation, SourceLocation PragmaPushLocation)
590 : StackSlotLabel(StackSlotLabel), Value(Value),
591 PragmaLocation(PragmaLocation),
592 PragmaPushLocation(PragmaPushLocation) {}
593 };
594
595 void Act(SourceLocation PragmaLocation, PragmaMsStackAction Action,
596 llvm::StringRef StackSlotLabel, ValueType Value) {
597 if (Action == PSK_Reset) {
598 CurrentValue = DefaultValue;
599 CurrentPragmaLocation = PragmaLocation;
600 return;
601 }
602 if (Action & PSK_Push)
603 Stack.emplace_back(StackSlotLabel, CurrentValue, CurrentPragmaLocation,
604 PragmaLocation);
605 else if (Action & PSK_Pop) {
606 if (!StackSlotLabel.empty()) {
607 // If we've got a label, try to find it and jump there.
608 auto I = llvm::find_if(llvm::reverse(Stack), [&](const Slot &x) {
609 return x.StackSlotLabel == StackSlotLabel;
610 });
611 // If we found the label so pop from there.
612 if (I != Stack.rend()) {
613 CurrentValue = I->Value;
614 CurrentPragmaLocation = I->PragmaLocation;
615 Stack.erase(std::prev(I.base()), Stack.end());
616 }
617 } else if (!Stack.empty()) {
618 // We do not have a label, just pop the last entry.
619 CurrentValue = Stack.back().Value;
620 CurrentPragmaLocation = Stack.back().PragmaLocation;
621 Stack.pop_back();
622 }
623 }
624 if (Action & PSK_Set) {
625 CurrentValue = Value;
626 CurrentPragmaLocation = PragmaLocation;
627 }
628 }
629
630 // MSVC seems to add artificial slots to #pragma stacks on entering a C++
631 // method body to restore the stacks on exit, so it works like this:
632 //
633 // struct S {
634 // #pragma <name>(push, InternalPragmaSlot, <current_pragma_value>)
635 // void Method {}
636 // #pragma <name>(pop, InternalPragmaSlot)
637 // };
638 //
639 // It works even with #pragma vtordisp, although MSVC doesn't support
640 // #pragma vtordisp(push [, id], n)
641 // syntax.
642 //
643 // Push / pop a named sentinel slot.
644 void SentinelAction(PragmaMsStackAction Action, StringRef Label) {
645 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-13~++20210223111116+16ede0956cb1/clang/include/clang/Sema/Sema.h"
, 646, __PRETTY_FUNCTION__))
646 "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-13~++20210223111116+16ede0956cb1/clang/include/clang/Sema/Sema.h"
, 646, __PRETTY_FUNCTION__))
;
647 Act(CurrentPragmaLocation, Action, Label, CurrentValue);
648 }
649
650 // Constructors.
651 explicit PragmaStack(const ValueType &Default)
652 : DefaultValue(Default), CurrentValue(Default) {}
653
654 bool hasValue() const { return CurrentValue != DefaultValue; }
655
656 SmallVector<Slot, 2> Stack;
657 ValueType DefaultValue; // Value used for PSK_Reset action.
658 ValueType CurrentValue;
659 SourceLocation CurrentPragmaLocation;
660 };
661 // FIXME: We should serialize / deserialize these if they occur in a PCH (but
662 // we shouldn't do so if they're in a module).
663
664 /// Whether to insert vtordisps prior to virtual bases in the Microsoft
665 /// C++ ABI. Possible values are 0, 1, and 2, which mean:
666 ///
667 /// 0: Suppress all vtordisps
668 /// 1: Insert vtordisps in the presence of vbase overrides and non-trivial
669 /// structors
670 /// 2: Always insert vtordisps to support RTTI on partially constructed
671 /// objects
672 PragmaStack<MSVtorDispMode> VtorDispStack;
673 PragmaStack<AlignPackInfo> AlignPackStack;
674 // The current #pragma align/pack values and locations at each #include.
675 struct AlignPackIncludeState {
676 AlignPackInfo CurrentValue;
677 SourceLocation CurrentPragmaLocation;
678 bool HasNonDefaultValue, ShouldWarnOnInclude;
679 };
680 SmallVector<AlignPackIncludeState, 8> AlignPackIncludeStack;
681 // Segment #pragmas.
682 PragmaStack<StringLiteral *> DataSegStack;
683 PragmaStack<StringLiteral *> BSSSegStack;
684 PragmaStack<StringLiteral *> ConstSegStack;
685 PragmaStack<StringLiteral *> CodeSegStack;
686
687 // This stack tracks the current state of Sema.CurFPFeatures.
688 PragmaStack<FPOptionsOverride> FpPragmaStack;
689 FPOptionsOverride CurFPFeatureOverrides() {
690 FPOptionsOverride result;
691 if (!FpPragmaStack.hasValue()) {
692 result = FPOptionsOverride();
693 } else {
694 result = FpPragmaStack.CurrentValue;
695 }
696 return result;
697 }
698
699 // RAII object to push / pop sentinel slots for all MS #pragma stacks.
700 // Actions should be performed only if we enter / exit a C++ method body.
701 class PragmaStackSentinelRAII {
702 public:
703 PragmaStackSentinelRAII(Sema &S, StringRef SlotLabel, bool ShouldAct);
704 ~PragmaStackSentinelRAII();
705
706 private:
707 Sema &S;
708 StringRef SlotLabel;
709 bool ShouldAct;
710 };
711
712 /// A mapping that describes the nullability we've seen in each header file.
713 FileNullabilityMap NullabilityMap;
714
715 /// Last section used with #pragma init_seg.
716 StringLiteral *CurInitSeg;
717 SourceLocation CurInitSegLoc;
718
719 /// VisContext - Manages the stack for \#pragma GCC visibility.
720 void *VisContext; // Really a "PragmaVisStack*"
721
722 /// This an attribute introduced by \#pragma clang attribute.
723 struct PragmaAttributeEntry {
724 SourceLocation Loc;
725 ParsedAttr *Attribute;
726 SmallVector<attr::SubjectMatchRule, 4> MatchRules;
727 bool IsUsed;
728 };
729
730 /// A push'd group of PragmaAttributeEntries.
731 struct PragmaAttributeGroup {
732 /// The location of the push attribute.
733 SourceLocation Loc;
734 /// The namespace of this push group.
735 const IdentifierInfo *Namespace;
736 SmallVector<PragmaAttributeEntry, 2> Entries;
737 };
738
739 SmallVector<PragmaAttributeGroup, 2> PragmaAttributeStack;
740
741 /// The declaration that is currently receiving an attribute from the
742 /// #pragma attribute stack.
743 const Decl *PragmaAttributeCurrentTargetDecl;
744
745 /// This represents the last location of a "#pragma clang optimize off"
746 /// directive if such a directive has not been closed by an "on" yet. If
747 /// optimizations are currently "on", this is set to an invalid location.
748 SourceLocation OptimizeOffPragmaLocation;
749
750 /// Flag indicating if Sema is building a recovery call expression.
751 ///
752 /// This flag is used to avoid building recovery call expressions
753 /// if Sema is already doing so, which would cause infinite recursions.
754 bool IsBuildingRecoveryCallExpr;
755
756 /// Used to control the generation of ExprWithCleanups.
757 CleanupInfo Cleanup;
758
759 /// ExprCleanupObjects - This is the stack of objects requiring
760 /// cleanup that are created by the current full expression.
761 SmallVector<ExprWithCleanups::CleanupObject, 8> ExprCleanupObjects;
762
763 /// Store a set of either DeclRefExprs or MemberExprs that contain a reference
764 /// to a variable (constant) that may or may not be odr-used in this Expr, and
765 /// we won't know until all lvalue-to-rvalue and discarded value conversions
766 /// have been applied to all subexpressions of the enclosing full expression.
767 /// This is cleared at the end of each full expression.
768 using MaybeODRUseExprSet = llvm::SetVector<Expr *, SmallVector<Expr *, 4>,
769 llvm::SmallPtrSet<Expr *, 4>>;
770 MaybeODRUseExprSet MaybeODRUseExprs;
771
772 std::unique_ptr<sema::FunctionScopeInfo> CachedFunctionScope;
773
774 /// Stack containing information about each of the nested
775 /// function, block, and method scopes that are currently active.
776 SmallVector<sema::FunctionScopeInfo *, 4> FunctionScopes;
777
778 /// The index of the first FunctionScope that corresponds to the current
779 /// context.
780 unsigned FunctionScopesStart = 0;
781
782 ArrayRef<sema::FunctionScopeInfo*> getFunctionScopes() const {
783 return llvm::makeArrayRef(FunctionScopes.begin() + FunctionScopesStart,
784 FunctionScopes.end());
785 }
786
787 /// Stack containing information needed when in C++2a an 'auto' is encountered
788 /// in a function declaration parameter type specifier in order to invent a
789 /// corresponding template parameter in the enclosing abbreviated function
790 /// template. This information is also present in LambdaScopeInfo, stored in
791 /// the FunctionScopes stack.
792 SmallVector<InventedTemplateParameterInfo, 4> InventedParameterInfos;
793
794 /// The index of the first InventedParameterInfo that refers to the current
795 /// context.
796 unsigned InventedParameterInfosStart = 0;
797
798 ArrayRef<InventedTemplateParameterInfo> getInventedParameterInfos() const {
799 return llvm::makeArrayRef(InventedParameterInfos.begin() +
800 InventedParameterInfosStart,
801 InventedParameterInfos.end());
802 }
803
804 typedef LazyVector<TypedefNameDecl *, ExternalSemaSource,
805 &ExternalSemaSource::ReadExtVectorDecls, 2, 2>
806 ExtVectorDeclsType;
807
808 /// ExtVectorDecls - This is a list all the extended vector types. This allows
809 /// us to associate a raw vector type with one of the ext_vector type names.
810 /// This is only necessary for issuing pretty diagnostics.
811 ExtVectorDeclsType ExtVectorDecls;
812
813 /// FieldCollector - Collects CXXFieldDecls during parsing of C++ classes.
814 std::unique_ptr<CXXFieldCollector> FieldCollector;
815
816 typedef llvm::SmallSetVector<NamedDecl *, 16> NamedDeclSetType;
817
818 /// Set containing all declared private fields that are not used.
819 NamedDeclSetType UnusedPrivateFields;
820
821 /// Set containing all typedefs that are likely unused.
822 llvm::SmallSetVector<const TypedefNameDecl *, 4>
823 UnusedLocalTypedefNameCandidates;
824
825 /// Delete-expressions to be analyzed at the end of translation unit
826 ///
827 /// This list contains class members, and locations of delete-expressions
828 /// that could not be proven as to whether they mismatch with new-expression
829 /// used in initializer of the field.
830 typedef std::pair<SourceLocation, bool> DeleteExprLoc;
831 typedef llvm::SmallVector<DeleteExprLoc, 4> DeleteLocs;
832 llvm::MapVector<FieldDecl *, DeleteLocs> DeleteExprs;
833
834 typedef llvm::SmallPtrSet<const CXXRecordDecl*, 8> RecordDeclSetTy;
835
836 /// PureVirtualClassDiagSet - a set of class declarations which we have
837 /// emitted a list of pure virtual functions. Used to prevent emitting the
838 /// same list more than once.
839 std::unique_ptr<RecordDeclSetTy> PureVirtualClassDiagSet;
840
841 /// ParsingInitForAutoVars - a set of declarations with auto types for which
842 /// we are currently parsing the initializer.
843 llvm::SmallPtrSet<const Decl*, 4> ParsingInitForAutoVars;
844
845 /// Look for a locally scoped extern "C" declaration by the given name.
846 NamedDecl *findLocallyScopedExternCDecl(DeclarationName Name);
847
848 typedef LazyVector<VarDecl *, ExternalSemaSource,
849 &ExternalSemaSource::ReadTentativeDefinitions, 2, 2>
850 TentativeDefinitionsType;
851
852 /// All the tentative definitions encountered in the TU.
853 TentativeDefinitionsType TentativeDefinitions;
854
855 /// All the external declarations encoutered and used in the TU.
856 SmallVector<VarDecl *, 4> ExternalDeclarations;
857
858 typedef LazyVector<const DeclaratorDecl *, ExternalSemaSource,
859 &ExternalSemaSource::ReadUnusedFileScopedDecls, 2, 2>
860 UnusedFileScopedDeclsType;
861
862 /// The set of file scoped decls seen so far that have not been used
863 /// and must warn if not used. Only contains the first declaration.
864 UnusedFileScopedDeclsType UnusedFileScopedDecls;
865
866 typedef LazyVector<CXXConstructorDecl *, ExternalSemaSource,
867 &ExternalSemaSource::ReadDelegatingConstructors, 2, 2>
868 DelegatingCtorDeclsType;
869
870 /// All the delegating constructors seen so far in the file, used for
871 /// cycle detection at the end of the TU.
872 DelegatingCtorDeclsType DelegatingCtorDecls;
873
874 /// All the overriding functions seen during a class definition
875 /// that had their exception spec checks delayed, plus the overridden
876 /// function.
877 SmallVector<std::pair<const CXXMethodDecl*, const CXXMethodDecl*>, 2>
878 DelayedOverridingExceptionSpecChecks;
879
880 /// All the function redeclarations seen during a class definition that had
881 /// their exception spec checks delayed, plus the prior declaration they
882 /// should be checked against. Except during error recovery, the new decl
883 /// should always be a friend declaration, as that's the only valid way to
884 /// redeclare a special member before its class is complete.
885 SmallVector<std::pair<FunctionDecl*, FunctionDecl*>, 2>
886 DelayedEquivalentExceptionSpecChecks;
887
888 typedef llvm::MapVector<const FunctionDecl *,
889 std::unique_ptr<LateParsedTemplate>>
890 LateParsedTemplateMapT;
891 LateParsedTemplateMapT LateParsedTemplateMap;
892
893 /// Callback to the parser to parse templated functions when needed.
894 typedef void LateTemplateParserCB(void *P, LateParsedTemplate &LPT);
895 typedef void LateTemplateParserCleanupCB(void *P);
896 LateTemplateParserCB *LateTemplateParser;
897 LateTemplateParserCleanupCB *LateTemplateParserCleanup;
898 void *OpaqueParser;
899
900 void SetLateTemplateParser(LateTemplateParserCB *LTP,
901 LateTemplateParserCleanupCB *LTPCleanup,
902 void *P) {
903 LateTemplateParser = LTP;
904 LateTemplateParserCleanup = LTPCleanup;
905 OpaqueParser = P;
906 }
907
908 class DelayedDiagnostics;
909
910 class DelayedDiagnosticsState {
911 sema::DelayedDiagnosticPool *SavedPool;
912 friend class Sema::DelayedDiagnostics;
913 };
914 typedef DelayedDiagnosticsState ParsingDeclState;
915 typedef DelayedDiagnosticsState ProcessingContextState;
916
917 /// A class which encapsulates the logic for delaying diagnostics
918 /// during parsing and other processing.
919 class DelayedDiagnostics {
920 /// The current pool of diagnostics into which delayed
921 /// diagnostics should go.
922 sema::DelayedDiagnosticPool *CurPool;
923
924 public:
925 DelayedDiagnostics() : CurPool(nullptr) {}
926
927 /// Adds a delayed diagnostic.
928 void add(const sema::DelayedDiagnostic &diag); // in DelayedDiagnostic.h
929
930 /// Determines whether diagnostics should be delayed.
931 bool shouldDelayDiagnostics() { return CurPool != nullptr; }
932
933 /// Returns the current delayed-diagnostics pool.
934 sema::DelayedDiagnosticPool *getCurrentPool() const {
935 return CurPool;
936 }
937
938 /// Enter a new scope. Access and deprecation diagnostics will be
939 /// collected in this pool.
940 DelayedDiagnosticsState push(sema::DelayedDiagnosticPool &pool) {
941 DelayedDiagnosticsState state;
942 state.SavedPool = CurPool;
943 CurPool = &pool;
944 return state;
945 }
946
947 /// Leave a delayed-diagnostic state that was previously pushed.
948 /// Do not emit any of the diagnostics. This is performed as part
949 /// of the bookkeeping of popping a pool "properly".
950 void popWithoutEmitting(DelayedDiagnosticsState state) {
951 CurPool = state.SavedPool;
952 }
953
954 /// Enter a new scope where access and deprecation diagnostics are
955 /// not delayed.
956 DelayedDiagnosticsState pushUndelayed() {
957 DelayedDiagnosticsState state;
958 state.SavedPool = CurPool;
959 CurPool = nullptr;
960 return state;
961 }
962
963 /// Undo a previous pushUndelayed().
964 void popUndelayed(DelayedDiagnosticsState state) {
965 assert(CurPool == nullptr)((CurPool == nullptr) ? static_cast<void> (0) : __assert_fail
("CurPool == nullptr", "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/include/clang/Sema/Sema.h"
, 965, __PRETTY_FUNCTION__))
;
966 CurPool = state.SavedPool;
967 }
968 } DelayedDiagnostics;
969
970 /// A RAII object to temporarily push a declaration context.
971 class ContextRAII {
972 private:
973 Sema &S;
974 DeclContext *SavedContext;
975 ProcessingContextState SavedContextState;
976 QualType SavedCXXThisTypeOverride;
977 unsigned SavedFunctionScopesStart;
978 unsigned SavedInventedParameterInfosStart;
979
980 public:
981 ContextRAII(Sema &S, DeclContext *ContextToPush, bool NewThisContext = true)
982 : S(S), SavedContext(S.CurContext),
983 SavedContextState(S.DelayedDiagnostics.pushUndelayed()),
984 SavedCXXThisTypeOverride(S.CXXThisTypeOverride),
985 SavedFunctionScopesStart(S.FunctionScopesStart),
986 SavedInventedParameterInfosStart(S.InventedParameterInfosStart)
987 {
988 assert(ContextToPush && "pushing null context")((ContextToPush && "pushing null context") ? static_cast
<void> (0) : __assert_fail ("ContextToPush && \"pushing null context\""
, "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/include/clang/Sema/Sema.h"
, 988, __PRETTY_FUNCTION__))
;
989 S.CurContext = ContextToPush;
990 if (NewThisContext)
991 S.CXXThisTypeOverride = QualType();
992 // Any saved FunctionScopes do not refer to this context.
993 S.FunctionScopesStart = S.FunctionScopes.size();
994 S.InventedParameterInfosStart = S.InventedParameterInfos.size();
995 }
996
997 void pop() {
998 if (!SavedContext) return;
999 S.CurContext = SavedContext;
1000 S.DelayedDiagnostics.popUndelayed(SavedContextState);
1001 S.CXXThisTypeOverride = SavedCXXThisTypeOverride;
1002 S.FunctionScopesStart = SavedFunctionScopesStart;
1003 S.InventedParameterInfosStart = SavedInventedParameterInfosStart;
1004 SavedContext = nullptr;
1005 }
1006
1007 ~ContextRAII() {
1008 pop();
1009 }
1010 };
1011
1012 /// Whether the AST is currently being rebuilt to correct immediate
1013 /// invocations. Immediate invocation candidates and references to consteval
1014 /// functions aren't tracked when this is set.
1015 bool RebuildingImmediateInvocation = false;
1016
1017 /// Used to change context to isConstantEvaluated without pushing a heavy
1018 /// ExpressionEvaluationContextRecord object.
1019 bool isConstantEvaluatedOverride;
1020
1021 bool isConstantEvaluated() {
1022 return ExprEvalContexts.back().isConstantEvaluated() ||
1023 isConstantEvaluatedOverride;
1024 }
1025
1026 /// RAII object to handle the state changes required to synthesize
1027 /// a function body.
1028 class SynthesizedFunctionScope {
1029 Sema &S;
1030 Sema::ContextRAII SavedContext;
1031 bool PushedCodeSynthesisContext = false;
1032
1033 public:
1034 SynthesizedFunctionScope(Sema &S, DeclContext *DC)
1035 : S(S), SavedContext(S, DC) {
1036 S.PushFunctionScope();
1037 S.PushExpressionEvaluationContext(
1038 Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
1039 if (auto *FD = dyn_cast<FunctionDecl>(DC))
1040 FD->setWillHaveBody(true);
1041 else
1042 assert(isa<ObjCMethodDecl>(DC))((isa<ObjCMethodDecl>(DC)) ? static_cast<void> (0
) : __assert_fail ("isa<ObjCMethodDecl>(DC)", "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/include/clang/Sema/Sema.h"
, 1042, __PRETTY_FUNCTION__))
;
1043 }
1044
1045 void addContextNote(SourceLocation UseLoc) {
1046 assert(!PushedCodeSynthesisContext)((!PushedCodeSynthesisContext) ? static_cast<void> (0) :
__assert_fail ("!PushedCodeSynthesisContext", "/build/llvm-toolchain-snapshot-13~++20210223111116+16ede0956cb1/clang/include/clang/Sema/Sema.h"
, 1046, __PRETTY_FUNCTION__))
;
1047
1048 Sema::CodeSynthesisContext Ctx;
1049 Ctx.Kind = Sema::CodeSynthesisContext::DefiningSynthesizedFunction;
1050 Ctx.PointOfInstantiation = UseLoc;
1051 Ctx.Entity = cast<Decl>(S.CurContext);
1052 S.pushCodeSynthesisContext(Ctx);
1053
1054 PushedCodeSynthesisContext = true;
1055 }
1056
1057 ~SynthesizedFunctionScope() {
1058 if (PushedCodeSynthesisContext)
1059 S.popCodeSynthesisContext();
1060 if (auto *FD = dyn_cast<FunctionDecl>(S.CurContext))
1061 FD->setWillHaveBody(false);
1062 S.PopExpressionEvaluationContext();
1063 S.PopFunctionScopeInfo();
1064 }
1065 };
1066
1067 /// WeakUndeclaredIdentifiers - Identifiers contained in
1068 /// \#pragma weak before declared. rare. may alias another
1069 /// identifier, declared or undeclared
1070 llvm::MapVector<IdentifierInfo *, WeakInfo> WeakUndeclaredIdentifiers;
1071
1072 /// ExtnameUndeclaredIdentifiers - Identifiers contained in
1073 /// \#pragma redefine_extname before declared. Used in Solaris system headers
1074 /// to define functions that occur in multiple standards to call the version
1075 /// in the currently selected standard.
1076 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*> ExtnameUndeclaredIdentifiers;
1077
1078
1079 /// Load weak undeclared identifiers from the external source.
1080 void LoadExternalWeakUndeclaredIdentifiers();
1081
1082 /// WeakTopLevelDecl - Translation-unit scoped declarations generated by
1083 /// \#pragma weak during processing of other Decls.
1084 /// I couldn't figure out a clean way to generate these in-line, so
1085 /// we store them here and handle separately -- which is a hack.
1086 /// It would be best to refactor this.
1087 SmallVector<Decl*,2> WeakTopLevelDecl;
1088
1089 IdentifierResolver IdResolver;
1090
1091 /// Translation Unit Scope - useful to Objective-C actions that need
1092 /// to lookup file scope declarations in the "ordinary" C decl namespace.
1093 /// For example, user-defined classes, built-in "id" type, etc.
1094 Scope *TUScope;
1095
1096 /// The C++ "std" namespace, where the standard library resides.
1097 LazyDeclPtr StdNamespace;
1098
1099 /// The C++ "std::bad_alloc" class, which is defined by the C++
1100 /// standard library.
1101 LazyDeclPtr StdBadAlloc;
1102
1103 /// The C++ "std::align_val_t" enum class, which is defined by the C++
1104 /// standard library.
1105 LazyDeclPtr StdAlignValT;
1106
1107 /// The C++ "std::experimental" namespace, where the experimental parts
1108 /// of the standard library resides.
1109 NamespaceDecl *StdExperimentalNamespaceCache;
1110
1111 /// The C++ "std::initializer_list" template, which is defined in
1112 /// \<initializer_list>.
1113 ClassTemplateDecl *StdInitializerList;
1114
1115 /// The C++ "std::coroutine_traits" template, which is defined in
1116 /// \<coroutine_traits>
1117 ClassTemplateDecl *StdCoroutineTraitsCache;
1118
1119 /// The C++ "type_info" declaration, which is defined in \<typeinfo>.
1120 RecordDecl *CXXTypeInfoDecl;
1121
1122 /// The MSVC "_GUID" struct, which is defined in MSVC header files.
1123 RecordDecl *MSVCGuidDecl;
1124
1125 /// Caches identifiers/selectors for NSFoundation APIs.
1126 std::unique_ptr<NSAPI> NSAPIObj;
1127
1128 /// The declaration of the Objective-C NSNumber class.
1129 ObjCInterfaceDecl *NSNumberDecl;
1130
1131 /// The declaration of the Objective-C NSValue class.
1132 ObjCInterfaceDecl *NSValueDecl;
1133
1134 /// Pointer to NSNumber type (NSNumber *).
1135 QualType NSNumberPointer;
1136
1137 /// Pointer to NSValue type (NSValue *).
1138 QualType NSValuePointer;
1139
1140 /// The Objective-C NSNumber methods used to create NSNumber literals.
1141 ObjCMethodDecl *NSNumberLiteralMethods[NSAPI::NumNSNumberLiteralMethods];
1142
1143 /// The declaration of the Objective-C NSString class.
1144 ObjCInterfaceDecl *NSStringDecl;
1145
1146 /// Pointer to NSString type (NSString *).
1147 QualType NSStringPointer;
1148
1149 /// The declaration of the stringWithUTF8String: method.
1150 ObjCMethodDecl *StringWithUTF8StringMethod;
1151
1152 /// The declaration of the valueWithBytes:objCType: method.
1153 ObjCMethodDecl *ValueWithBytesObjCTypeMethod;
1154
1155 /// The declaration of the Objective-C NSArray class.
1156 ObjCInterfaceDecl *NSArrayDecl;
1157
1158 /// The declaration of the arrayWithObjects:count: method.
1159 ObjCMethodDecl *ArrayWithObjectsMethod;
1160
1161 /// The declaration of the Objective-C NSDictionary class.
1162 ObjCInterfaceDecl *NSDictionaryDecl;
1163
1164 /// The declaration of the dictionaryWithObjects:forKeys:count: method.
1165 ObjCMethodDecl *DictionaryWithObjectsMethod;
1166
1167 /// id<NSCopying> type.
1168 QualType QIDNSCopying;
1169
1170 /// will hold 'respondsToSelector:'
1171 Selector RespondsToSelectorSel;
1172
1173 /// A flag to remember whether the implicit forms of operator new and delete
1174 /// have been declared.
1175 bool GlobalNewDeleteDeclared;
1176
1177 /// Describes how the expressions currently being parsed are
1178 /// evaluated at run-time, if at all.
1179 enum class ExpressionEvaluationContext {
1180 /// The current expression and its subexpressions occur within an
1181 /// unevaluated operand (C++11 [expr]p7), such as the subexpression of
1182 /// \c sizeof, where the type of the expression may be significant but
1183 /// no code will be generated to evaluate the value of the expression at
1184 /// run time.
1185 Unevaluated,
1186
1187 /// The current expression occurs within a braced-init-list within
1188 /// an unevaluated operand. This is mostly like a regular unevaluated
1189 /// context, except that we still instantiate constexpr functions that are
1190 /// referenced here so that we can perform narrowing checks correctly.
1191 UnevaluatedList,
1192
1193 /// The current expression occurs within a discarded statement.
1194 /// This behaves largely similarly to an unevaluated operand in preventing
1195 /// definitions from being required, but not in other ways.
1196 DiscardedStatement,
1197
1198 /// The current expression occurs within an unevaluated
1199 /// operand that unconditionally permits abstract references to
1200 /// fields, such as a SIZE operator in MS-style inline assembly.
1201 UnevaluatedAbstract,
1202
1203 /// The current context is "potentially evaluated" in C++11 terms,
1204 /// but the expression is evaluated at compile-time (like the values of
1205 /// cases in a switch statement).
1206 ConstantEvaluated,
1207
1208 /// The current expression is potentially evaluated at run time,
1209 /// which means that code may be generated to evaluate the value of the
1210 /// expression at run time.
1211 PotentiallyEvaluated,
1212
1213 /// The current expression is potentially evaluated, but any
1214 /// declarations referenced inside that expression are only used if
1215 /// in fact the current expression is used.
1216 ///
1217 /// This value is used when parsing default function arguments, for which
1218 /// we would like to provide diagnostics (e.g., passing non-POD arguments
1219 /// through varargs) but do not want to mark declarations as "referenced"
1220 /// until the default argument is used.
1221 PotentiallyEvaluatedIfUsed
1222 };
1223
1224 using ImmediateInvocationCandidate = llvm::PointerIntPair<ConstantExpr *, 1>;
1225
1226 /// Data structure used to record current or nested
1227 /// expression evaluation contexts.
1228 struct ExpressionEvaluationContextRecord {
1229 /// The expression evaluation context.
1230 ExpressionEvaluationContext Context;
1231
1232 /// Whether the enclosing context needed a cleanup.
1233 CleanupInfo ParentCleanup;
1234
1235 /// The number of active cleanup objects when we entered
1236 /// this expression evaluation context.
1237 unsigned NumCleanupObjects;
1238
1239 /// The number of typos encountered during this expression evaluation
1240 /// context (i.e. the number of TypoExprs created).
1241 unsigned NumTypos;
1242
1243 MaybeODRUseExprSet SavedMaybeODRUseExprs;
1244
1245 /// The lambdas that are present within this context, if it
1246 /// is indeed an unevaluated context.
1247 SmallVector<LambdaExpr *, 2> Lambdas;
1248
1249 /// The declaration that provides context for lambda expressions
1250 /// and block literals if the normal declaration context does not
1251 /// suffice, e.g., in a default function argument.
1252 Decl *ManglingContextDecl;
1253
1254 /// If we are processing a decltype type, a set of call expressions
1255 /// for which we have deferred checking the completeness of the return type.
1256 SmallVector<CallExpr *, 8> DelayedDecltypeCalls;
1257
1258 /// If we are processing a decltype type, a set of temporary binding
1259 /// expressions for which we have deferred checking the destructor.
1260 SmallVector<CXXBindTemporaryExpr *, 8> DelayedDecltypeBinds;
1261
1262 llvm::SmallPtrSet<const Expr *, 8> PossibleDerefs;
1263
1264 /// Expressions appearing as the LHS of a volatile assignment in this
1265 /// context. We produce a warning for these when popping the context if
1266 /// they are not discarded-value expressions nor unevaluated operands.
1267 SmallVector<Expr*, 2> VolatileAssignmentLHSs;
1268
1269 /// Set of candidates for starting an immediate invocation.
1270 llvm::SmallVector<ImmediateInvocationCandidate, 4> ImmediateInvocationCandidates;
1271
1272 /// Set of DeclRefExprs referencing a consteval function when used in a
1273 /// context not already known to be immediately invoked.
1274 llvm::SmallPtrSet<DeclRefExpr *, 4> ReferenceToConsteval;
1275
1276 /// \brief Describes whether we are in an expression constext which we have
1277 /// to handle differently.
1278 enum ExpressionKind {
1279 EK_Decltype, EK_TemplateArgument, EK_Other
1280 } ExprContext;
1281
1282 ExpressionEvaluationContextRecord(ExpressionEvaluationContext Context,
1283 unsigned NumCleanupObjects,
1284 CleanupInfo ParentCleanup,
1285 Decl *ManglingContextDecl,
1286 ExpressionKind ExprContext)
1287 : Context(Context), ParentCleanup(ParentCleanup),
1288 NumCleanupObjects(NumCleanupObjects), NumTypos(0),
1289 ManglingContextDecl(ManglingContextDecl), ExprContext(ExprContext) {}
1290
1291 bool isUnevaluated() const {
1292 return Context == ExpressionEvaluationContext::Unevaluated ||
1293 Context == ExpressionEvaluationContext::UnevaluatedAbstract ||
1294 Context == ExpressionEvaluationContext::UnevaluatedList;
1295 }
1296 bool isConstantEvaluated() const {
1297 return Context == ExpressionEvaluationContext::ConstantEvaluated;
1298 }
1299 };
1300
1301 /// A stack of expression evaluation contexts.
1302 SmallVector<ExpressionEvaluationContextRecord, 8> ExprEvalContexts;
1303
1304 /// Emit a warning for all pending noderef expressions that we recorded.
1305 void WarnOnPendingNoDerefs(ExpressionEvaluationContextRecord &Rec);
1306
1307 /// Compute the mangling number context for a lambda expression or
1308 /// block literal. Also return the extra mangling decl if any.
1309 ///
1310 /// \param DC - The DeclContext containing the lambda expression or
1311 /// block literal.
1312 std::tuple<MangleNumberingContext *, Decl *>
1313 getCurrentMangleNumberContext(const DeclContext *DC);
1314
1315
1316 /// SpecialMemberOverloadResult - The overloading result for a special member
1317 /// function.
1318 ///
1319 /// This is basically a wrapper around PointerIntPair. The lowest bits of the
1320 /// integer are used to determine whether overload resolution succeeded.
1321 class SpecialMemberOverloadResult {
1322 public:
1323 enum Kind {
1324 NoMemberOrDeleted,
1325 Ambiguous,
1326 Success
1327 };
1328
1329 private:
1330 llvm::PointerIntPair<CXXMethodDecl*, 2> Pair;
1331
1332 public:
1333 SpecialMemberOverloadResult() : Pair() {}
1334 SpecialMemberOverloadResult(CXXMethodDecl *MD)
1335 : Pair(MD, MD->isDeleted() ? NoMemberOrDeleted : Success) {}
1336
1337 CXXMethodDecl *getMethod() const { return Pair.getPointer(); }
1338 void setMethod(CXXMethodDecl *MD) { Pair.setPointer(MD); }
1339
1340 Kind getKind() const { return static_cast<Kind>(Pair.getInt()); }
1341 void setKind(Kind K) { Pair.setInt(K); }
1342 };
1343
1344 class SpecialMemberOverloadResultEntry
1345 : public llvm::FastFoldingSetNode,
1346 public SpecialMemberOverloadResult {
1347 public:
1348 SpecialMemberOverloadResultEntry(const llvm::FoldingSetNodeID &ID)
1349 : FastFoldingSetNode(ID)
1350 {}
1351 };
1352
1353 /// A cache of special member function overload resolution results
1354 /// for C++ records.
1355 llvm::FoldingSet<SpecialMemberOverloadResultEntry> SpecialMemberCache;
1356
1357 /// A cache of the flags available in enumerations with the flag_bits
1358 /// attribute.
1359 mutable llvm::DenseMap<const EnumDecl*, llvm::APInt> FlagBitsCache;
1360
1361 /// The kind of translation unit we are processing.
1362 ///
1363 /// When we're processing a complete translation unit, Sema will perform
1364 /// end-of-translation-unit semantic tasks (such as creating
1365 /// initializers for tentative definitions in C) once parsing has
1366 /// completed. Modules and precompiled headers perform different kinds of
1367 /// checks.
1368 TranslationUnitKind TUKind;
1369
1370 llvm::BumpPtrAllocator BumpAlloc;
1371
1372 /// The number of SFINAE diagnostics that have been trapped.
1373 unsigned NumSFINAEErrors;
1374
1375 typedef llvm::DenseMap<ParmVarDecl *, llvm::TinyPtrVector<ParmVarDecl *>>
1376 UnparsedDefaultArgInstantiationsMap;
1377
1378 /// A mapping from parameters with unparsed default arguments to the
1379 /// set of instantiations of each parameter.
1380 ///
1381 /// This mapping is a temporary data structure used when parsing
1382 /// nested class templates or nested classes of class templates,
1383 /// where we might end up instantiating an inner class before the
1384 /// default arguments of its methods have been parsed.
1385 UnparsedDefaultArgInstantiationsMap UnparsedDefaultArgInstantiations;
1386
1387 // Contains the locations of the beginning of unparsed default
1388 // argument locations.
1389 llvm::DenseMap<ParmVarDecl *, SourceLocation> UnparsedDefaultArgLocs;
1390
1391 /// UndefinedInternals - all the used, undefined objects which require a
1392 /// definition in this translation unit.
1393 llvm::MapVector<NamedDecl *, SourceLocation> UndefinedButUsed;
1394
1395 /// Determine if VD, which must be a variable or function, is an external
1396 /// symbol that nonetheless can't be referenced from outside this translation
1397 /// unit because its type has no linkage and it's not extern "C".
1398 bool isExternalWithNoLinkageType(ValueDecl *VD);
1399
1400 /// Obtain a sorted list of functions that are undefined but ODR-used.
1401 void getUndefinedButUsed(
1402 SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined);
1403
1404 /// Retrieves list of suspicious delete-expressions that will be checked at
1405 /// the end of translation unit.
1406 const llvm::MapVector<FieldDecl *, DeleteLocs> &
1407 getMismatchingDeleteExpressions() const;
1408
1409 typedef std::pair<ObjCMethodList, ObjCMethodList> GlobalMethods;
1410 typedef llvm::DenseMap<Selector, GlobalMethods> GlobalMethodPool;
1411
1412 /// Method Pool - allows efficient lookup when typechecking messages to "id".
1413 /// We need to maintain a list, since selectors can have differing signatures
1414 /// across classes. In Cocoa, this happens to be extremely uncommon (only 1%
1415 /// of selectors are "overloaded").
1416 /// At the head of the list it is recorded whether there were 0, 1, or >= 2
1417 /// methods inside categories with a particular selector.
1418 GlobalMethodPool MethodPool;
1419
1420 /// Method selectors used in a \@selector expression. Used for implementation
1421 /// of -Wselector.
1422 llvm::MapVector<Selector, SourceLocation> ReferencedSelectors;
1423
1424 /// List of SourceLocations where 'self' is implicitly retained inside a
1425 /// block.
1426 llvm::SmallVector<std::pair<SourceLocation, const BlockDecl *>, 1>
1427 ImplicitlyRetainedSelfLocs;
1428
1429 /// Kinds of C++ special members.
1430 enum CXXSpecialMember {
1431 CXXDefaultConstructor,
1432 CXXCopyConstructor,
1433 CXXMoveConstructor,
1434 CXXCopyAssignment,
1435 CXXMoveAssignment,
1436 CXXDestructor,
1437 CXXInvalid
1438 };
1439
1440 typedef llvm::PointerIntPair<CXXRecordDecl *, 3, CXXSpecialMember>
1441 SpecialMemberDecl;
1442
1443 /// The C++ special members which we are currently in the process of
1444 /// declaring. If this process recursively triggers the declaration of the
1445 /// same special member, we should act as if it is not yet declared.
1446 llvm::SmallPtrSet<SpecialMemberDecl, 4> SpecialMembersBeingDeclared;
1447
1448 /// Kinds of defaulted comparison operator functions.
1449 enum class DefaultedComparisonKind : unsigned char {
1450 /// This is not a defaultable comparison operator.
1451 None,
1452 /// This is an operator== that should be implemented as a series of
1453 /// subobject comparisons.
1454 Equal,
1455 /// This is an operator<=> that should be implemented as a series of
1456 /// subobject comparisons.
1457 ThreeWay,
1458 /// This is an operator!= that should be implemented as a rewrite in terms
1459 /// of a == comparison.
1460 NotEqual,
1461 /// This is an <, <=, >, or >= that should be implemented as a rewrite in
1462 /// terms of a <=> comparison.
1463 Relational,
1464 };
1465
1466 /// The function definitions which were renamed as part of typo-correction
1467 /// to match their respective declarations. We want to keep track of them
1468 /// to ensure that we don't emit a "redefinition" error if we encounter a
1469 /// correctly named definition after the renamed definition.
1470 llvm::SmallPtrSet<const NamedDecl *, 4> TypoCorrectedFunctionDefinitions;
1471
1472 /// Stack of types that correspond to the parameter entities that are
1473 /// currently being copy-initialized. Can be empty.
1474 llvm::SmallVector<QualType, 4> CurrentParameterCopyTypes;
1475
1476 void ReadMethodPool(Selector Sel);
1477 void updateOutOfDateSelector(Selector Sel);
1478
1479 /// Private Helper predicate to check for 'self'.
1480 bool isSelfExpr(Expr *RExpr);
1481 bool isSelfExpr(Expr *RExpr, const ObjCMethodDecl *Method);
1482
1483 /// Cause the active diagnostic on the DiagosticsEngine to be
1484 /// emitted. This is closely coupled to the SemaDiagnosticBuilder class and
1485 /// should not be used elsewhere.
1486 void EmitCurrentDiagnostic(unsigned DiagID);
1487
1488 /// Records and restores the CurFPFeatures state on entry/exit of compound
1489 /// statements.
1490 class FPFeaturesStateRAII {
1491 public:
1492 FPFeaturesStateRAII(Sema &S) : S(S), OldFPFeaturesState(S.CurFPFeatures) {
1493 OldOverrides = S.FpPragmaStack.CurrentValue;
1494 }
1495 ~FPFeaturesStateRAII() {
1496 S.CurFPFeatures = OldFPFeaturesState;
1497 S.FpPragmaStack.CurrentValue = OldOverrides;
1498 }
1499 FPOptionsOverride getOverrides() { return OldOverrides; }
1500
1501 private:
1502 Sema& S;
1503 FPOptions OldFPFeaturesState;
1504 FPOptionsOverride OldOverrides;
1505 };
1506
1507 void addImplicitTypedef(StringRef Name, QualType T);
1508
1509 bool WarnedStackExhausted = false;
1510
1511public:
1512 Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
1513 TranslationUnitKind TUKind = TU_Complete,
1514 CodeCompleteConsumer *CompletionConsumer = nullptr);
1515 ~Sema();
1516
1517 /// Perform initialization that occurs after the parser has been
1518 /// initialized but before it parses anything.
1519 void Initialize();
1520
1521 const LangOptions &getLangOpts() const { return LangOpts; }
1522 OpenCLOptions &getOpenCLOptions() { return OpenCLFeatures; }
1523 FPOptions &getCurFPFeatures() { return CurFPFeatures; }
1524
1525 DiagnosticsEngine &getDiagnostics() const { return Diags; }
1526 SourceManager &getSourceManager() const { return SourceMgr; }
1527 Preprocessor &getPreprocessor() const { return PP; }
1528 ASTContext &getASTContext() const { return Context; }
1529 ASTConsumer &getASTConsumer() const { return Consumer; }
1530 ASTMutationListener *getASTMutationListener() const;
1531 ExternalSemaSource* getExternalSource() const { return ExternalSource; }
1532
1533 ///Registers an external source. If an external source already exists,
1534 /// creates a multiplex external source and appends to it.
1535 ///
1536 ///\param[in] E - A non-null external sema source.
1537 ///
1538 void addExternalSource(ExternalSemaSource *E);
1539
1540 void PrintStats() const;
1541
1542 /// Warn that the stack is nearly exhausted.
1543 void warnStackExhausted(SourceLocation Loc);
1544
1545 /// Run some code with "sufficient" stack space. (Currently, at least 256K is
1546 /// guaranteed). Produces a warning if we're low on stack space and allocates
1547 /// more in that case. Use this in code that may recurse deeply (for example,
1548 /// in template instantiation) to avoid stack overflow.
1549 void runWithSufficientStackSpace(SourceLocation Loc,
1550 llvm::function_ref<void()> Fn);
1551
1552 /// Helper class that creates diagnostics with optional
1553 /// template instantiation stacks.
1554 ///
1555 /// This class provides a wrapper around the basic DiagnosticBuilder
1556 /// class that emits diagnostics. ImmediateDiagBuilder is
1557 /// responsible for emitting the diagnostic (as DiagnosticBuilder
1558 /// does) and, if the diagnostic comes from inside a template
1559 /// instantiation, printing the template instantiation stack as
1560 /// well.
1561 class ImmediateDiagBuilder : public DiagnosticBuilder {
1562 Sema &SemaRef;
1563 unsigned DiagID;
1564
1565 public:
1566 ImmediateDiagBuilder(DiagnosticBuilder &DB, Sema &SemaRef, unsigned DiagID)
1567 : DiagnosticBuilder(DB), SemaRef(SemaRef), DiagID(DiagID) {}
1568 ImmediateDiagBuilder(DiagnosticBuilder &&DB, Sema &SemaRef, unsigned DiagID)
1569 : DiagnosticBuilder(DB), SemaRef(SemaRef), DiagID(DiagID) {}
1570
1571 // This is a cunning lie. DiagnosticBuilder actually performs move
1572 // construction in its copy constructor (but due to varied uses, it's not
1573 // possible to conveniently express this as actual move construction). So
1574 // the default copy ctor here is fine, because the base class disables the
1575 // source anyway, so the user-defined ~ImmediateDiagBuilder is a safe no-op
1576 // in that case anwyay.
1577 ImmediateDiagBuilder(const ImmediateDiagBuilder &) = default;
1578
1579 ~ImmediateDiagBuilder() {
1580 // If we aren't active, there is nothing to do.
1581 if (!isActive()) return;
1582
1583 // Otherwise, we need to emit the diagnostic. First clear the diagnostic
1584 // builder itself so it won't emit the diagnostic in its own destructor.
1585 //
1586 // This seems wasteful, in that as written the DiagnosticBuilder dtor will
1587 // do its own needless checks to see if the diagnostic needs to be
1588 // emitted. However, because we take care to ensure that the builder
1589 // objects never escape, a sufficiently smart compiler will be able to
1590 // eliminate that code.
1591 Clear();
1592
1593 // Dispatch to Sema to emit the diagnostic.
1594 SemaRef.EmitCurrentDiagnostic(DiagID);
1595 }
1596
1597 /// Teach operator<< to produce an object of the correct type.
1598 template <typename T>
1599 friend const ImmediateDiagBuilder &
1600 operator<<(const ImmediateDiagBuilder &Diag, const T &Value) {
1601 const DiagnosticBuilder &BaseDiag = Diag;
1602 BaseDiag << Value;
1603 return Diag;
1604 }
1605
1606 // It is necessary to limit this to rvalue reference to avoid calling this
1607 // function with a bitfield lvalue argument since non-const reference to
1608 // bitfield is not allowed.
1609 template <typename T, typename = typename std::enable_if<
1610 !std::is_lvalue_reference<T>::value>::type>
1611 const ImmediateDiagBuilder &operator<<(T &&V) const {
1612 const DiagnosticBuilder &BaseDiag = *this;
1613 BaseDiag << std::move(V);
1614 return *this;
1615 }
1616 };
1617
1618 /// A generic diagnostic builder for errors which may or may not be deferred.
1619 ///
1620 /// In CUDA, there exist constructs (e.g. variable-length arrays, try/catch)
1621 /// which are not allowed to appear inside __device__ functions and are
1622 /// allowed to appear in __host__ __device__ functions only if the host+device
1623 /// function is never codegen'ed.
1624 ///
1625 /// To handle this, we use the notion of "deferred diagnostics", where we
1626 /// attach a diagnostic to a FunctionDecl that's emitted iff it's codegen'ed.
1627 ///
1628 /// This class lets you emit either a regular diagnostic, a deferred
1629 /// diagnostic, or no diagnostic at all, according to an argument you pass to
1630 /// its constructor, thus simplifying the process of creating these "maybe
1631 /// deferred" diagnostics.
1632 class SemaDiagnosticBuilder {
1633 public:
1634 enum Kind {
1635 /// Emit no diagnostics.
1636 K_Nop,
1637 /// Emit the diagnostic immediately (i.e., behave like Sema::Diag()).
1638 K_Immediate,
1639 /// Emit the diagnostic immediately, and, if it's a warning or error, also
1640 /// emit a call stack showing how this function can be reached by an a
1641 /// priori known-emitted function.
1642 K_ImmediateWithCallStack,
1643 /// Create a deferred diagnostic, which is emitted only if the function
1644 /// it's attached to is codegen'ed. Also emit a call stack as with
1645 /// K_ImmediateWithCallStack.
1646 K_Deferred
1647 };
1648
1649 SemaDiagnosticBuilder(Kind K, SourceLocation Loc, unsigned DiagID,
1650 FunctionDecl *Fn, Sema &S);
1651 SemaDiagnosticBuilder(SemaDiagnosticBuilder &&D);
1652 SemaDiagnosticBuilder(const SemaDiagnosticBuilder &) = default;
1653 ~SemaDiagnosticBuilder();
1654
1655 bool isImmediate() const { return ImmediateDiag.hasValue(); }
1656
1657 /// Convertible to bool: True if we immediately emitted an error, false if
1658 /// we didn't emit an error or we created a deferred error.
1659 ///
1660 /// Example usage:
1661 ///
1662 /// if (SemaDiagnosticBuilder(...) << foo << bar)
1663 /// return ExprError();
1664 ///
1665 /// But see CUDADiagIfDeviceCode() and CUDADiagIfHostCode() -- you probably
1666 /// want to use these instead of creating a SemaDiagnosticBuilder yourself.
1667 operator bool() const { return isImmediate(); }
1668
1669 template <typename T>
1670 friend const SemaDiagnosticBuilder &
1671 operator<<(const SemaDiagnosticBuilder &Diag, const T &Value) {
1672 if (Diag.ImmediateDiag.hasValue())
1673 *Diag.ImmediateDiag << Value;
1674 else if (Diag.PartialDiagId.hasValue())
1675 Diag.S.DeviceDeferredDiags[Diag.Fn][*Diag.PartialDiagId].second
1676 << Value;
1677 return Diag;
1678 }
1679
1680 // It is necessary to limit this to rvalue reference to avoid calling this
1681 // function with a bitfield lvalue argument since non-const reference to
1682 // bitfield is not allowed.
1683 template <typename T, typename = typename std::enable_if<
1684 !std::is_lvalue_reference<T>::value>::type>
1685 const SemaDiagnosticBuilder &operator<<(T &&V) const {
1686 if (ImmediateDiag.hasValue())
1687 *ImmediateDiag << std::move(V);
1688 else if (PartialDiagId.hasValue())
1689 S.DeviceDeferredDiags[Fn][*PartialDiagId].second << std::move(V);
1690 return *this;
1691 }
1692
1693 friend const SemaDiagnosticBuilder &
1694 operator<<(const SemaDiagnosticBuilder &Diag, const PartialDiagnostic &PD) {
1695 if (Diag.ImmediateDiag.hasValue())
1696 PD.Emit(*Diag.ImmediateDiag);
1697 else if (Diag.PartialDiagId.hasValue())
1698 Diag.S.DeviceDeferredDiags[Diag.Fn][*Diag.PartialDiagId].second = PD;
1699 return Diag;
1700 }
1701
1702 void AddFixItHint(const FixItHint &Hint) const {
1703 if (ImmediateDiag.hasValue())
1704 ImmediateDiag->AddFixItHint(Hint);
1705 else if (PartialDiagId.hasValue())
1706 S.DeviceDeferredDiags[Fn][*PartialDiagId].second.AddFixItHint(Hint);
1707 }
1708
1709 friend ExprResult ExprError(const SemaDiagnosticBuilder &) {
1710 return ExprError();
1711 }
1712 friend StmtResult StmtError(const SemaDiagnosticBuilder &) {
1713 return StmtError();
1714 }
1715 operator ExprResult() const { return ExprError(); }
1716 operator StmtResult() const { return StmtError(); }
1717 operator TypeResult() const { return TypeError(); }
1718 operator DeclResult() const { return DeclResult(true); }
1719 operator MemInitResult() const { return MemInitResult(true); }
1720
1721 private:
1722 Sema &S;
1723 SourceLocation Loc;
1724 unsigned DiagID;
1725 FunctionDecl *Fn;
1726 bool ShowCallStack;
1727
1728 // Invariant: At most one of these Optionals has a value.
1729 // FIXME: Switch these to a Variant once that exists.
1730 llvm::Optional<ImmediateDiagBuilder> ImmediateDiag;
1731 llvm::Optional<unsigned> PartialDiagId;
1732 };
1733
1734 /// Is the last error level diagnostic immediate. This is used to determined
1735 /// whether the next info diagnostic should be immediate.
1736 bool IsLastErrorImmediate = true;
1737
1738 /// Emit a diagnostic.
1739 SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID,
1740 bool DeferHint = false);
1741
1742 /// Emit a partial diagnostic.
1743 SemaDiagnosticBuilder Diag(SourceLocation Loc, const PartialDiagnostic &PD,
1744 bool DeferHint = false);
1745
1746 /// Build a partial diagnostic.
1747 PartialDiagnostic PDiag(unsigned DiagID = 0); // in SemaInternal.h
1748
1749 /// Whether uncompilable error has occurred. This includes error happens
1750 /// in deferred diagnostics.
1751 bool hasUncompilableErrorOccurred() const;
1752
1753 bool findMacroSpelling(SourceLocation &loc, StringRef name);
1754
1755 /// Get a string to suggest for zero-initialization of a type.
1756 std::string
1757 getFixItZeroInitializerForType(QualType T, SourceLocation Loc) const;
1758 std::string getFixItZeroLiteralForType(QualType T, SourceLocation Loc) const;
1759
1760 /// Calls \c Lexer::getLocForEndOfToken()
1761 SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset = 0);
1762
1763 /// Retrieve the module loader associated with the preprocessor.
1764 ModuleLoader &getModuleLoader() const;
1765
1766 /// Invent a new identifier for parameters of abbreviated templates.
1767 IdentifierInfo *
1768 InventAbbreviatedTemplateParameterTypeName(IdentifierInfo *ParamName,
1769 unsigned Index);
1770
1771 void emitAndClearUnusedLocalTypedefWarnings();
1772
1773 private:
1774 /// Function or variable declarations to be checked for whether the deferred
1775 /// diagnostics should be emitted.
1776 SmallVector<Decl *, 4> DeclsToCheckForDeferredDiags;
1777
1778 public:
1779 // Emit all deferred diagnostics.
1780 void emitDeferredDiags();
1781
1782 enum TUFragmentKind {
1783 /// The global module fragment, between 'module;' and a module-declaration.
1784 Global,
1785 /// A normal translation unit fragment. For a non-module unit, this is the
1786 /// entire translation unit. Otherwise, it runs from the module-declaration
1787 /// to the private-module-fragment (if any) or the end of the TU (if not).
1788 Normal,
1789 /// The private module fragment, between 'module :private;' and the end of
1790 /// the translation unit.
1791 Private
1792 };
1793
1794 void ActOnStartOfTranslationUnit();
1795 void ActOnEndOfTranslationUnit();
1796 void ActOnEndOfTranslationUnitFragment(TUFragmentKind Kind);
1797
1798 void CheckDelegatingCtorCycles();
1799
1800 Scope *getScopeForContext(DeclContext *Ctx);
1801
1802 void PushFunctionScope();
1803 void PushBlockScope(Scope *BlockScope, BlockDecl *Block);
1804 sema::LambdaScopeInfo *PushLambdaScope();
1805
1806 /// This is used to inform Sema what the current TemplateParameterDepth
1807 /// is during Parsing. Currently it is used to pass on the depth
1808 /// when parsing generic lambda 'auto' parameters.
1809 void RecordParsingTemplateParameterDepth(unsigned Depth);
1810
1811 void PushCapturedRegionScope(Scope *RegionScope, CapturedDecl *CD,
1812 RecordDecl *RD, CapturedRegionKind K,
1813 unsigned OpenMPCaptureLevel = 0);
1814
1815 /// Custom deleter to allow FunctionScopeInfos to be kept alive for a short
1816 /// time after they've been popped.
1817 class PoppedFunctionScopeDeleter {
1818 Sema *Self;
1819
1820 public:
1821 explicit PoppedFunctionScopeDeleter(Sema *Self) : Self(Self) {}
1822 void operator()(sema::FunctionScopeInfo *Scope) const;
1823 };
1824
1825 using PoppedFunctionScopePtr =
1826 std::unique_ptr<sema::FunctionScopeInfo, PoppedFunctionScopeDeleter>;
1827
1828 PoppedFunctionScopePtr
1829 PopFunctionScopeInfo(const sema::AnalysisBasedWarnings::Policy *WP = nullptr,
1830 const Decl *D = nullptr,
1831 QualType BlockType = QualType());
1832
1833 sema::FunctionScopeInfo *getCurFunction() const {
1834 return FunctionScopes.empty() ? nullptr : FunctionScopes.back();
1835 }
1836
1837 sema::FunctionScopeInfo *getEnclosingFunction() const;
1838
1839 void setFunctionHasBranchIntoScope();
1840 void setFunctionHasBranchProtectedScope();
1841 void setFunctionHasIndirectGoto();
1842
1843 void PushCompoundScope(bool IsStmtExpr);
1844 void PopCompoundScope();
1845
1846 sema::CompoundScopeInfo &getCurCompoundScope() const;
1847
1848 bool hasAnyUnrecoverableErrorsInThisFunction() const;
1849
1850 /// Retrieve the current block, if any.
1851 sema::BlockScopeInfo *getCurBlock();
1852
1853 /// Get the innermost lambda enclosing the current location, if any. This
1854 /// looks through intervening non-lambda scopes such as local functions and
1855 /// blocks.
1856 sema::LambdaScopeInfo *getEnclosingLambda() const;
1857
1858 /// Retrieve the current lambda scope info, if any.
1859 /// \param IgnoreNonLambdaCapturingScope true if should find the top-most
1860 /// lambda scope info ignoring all inner capturing scopes that are not
1861 /// lambda scopes.
1862 sema::LambdaScopeInfo *
1863 getCurLambda(bool IgnoreNonLambdaCapturingScope = false);
1864
1865 /// Retrieve the current generic lambda info, if any.
1866 sema::LambdaScopeInfo *getCurGenericLambda();
1867
1868 /// Retrieve the current captured region, if any.
1869 sema::CapturedRegionScopeInfo *getCurCapturedRegion();
1870
1871 /// WeakTopLevelDeclDecls - access to \#pragma weak-generated Decls
1872 SmallVectorImpl<Decl *> &WeakTopLevelDecls() { return WeakTopLevelDecl; }
1873
1874 /// Called before parsing a function declarator belonging to a function
1875 /// declaration.
1876 void ActOnStartFunctionDeclarationDeclarator(Declarator &D,
1877 unsigned TemplateParameterDepth);
1878
1879 /// Called after parsing a function declarator belonging to a function
1880 /// declaration.
1881 void ActOnFinishFunctionDeclarationDeclarator(Declarator &D);
1882
1883 void ActOnComment(SourceRange Comment);
1884
1885 //===--------------------------------------------------------------------===//
1886 // Type Analysis / Processing: SemaType.cpp.
1887 //
1888
1889 QualType BuildQualifiedType(QualType T, SourceLocation Loc, Qualifiers Qs,
1890 const DeclSpec *DS = nullptr);
1891 QualType BuildQualifiedType(QualType T, SourceLocation Loc, unsigned CVRA,
1892 const DeclSpec *DS = nullptr);
1893 QualType BuildPointerType(QualType T,
1894 SourceLocation Loc, DeclarationName Entity);
1895 QualType BuildReferenceType(QualType T, bool LValueRef,
1896 SourceLocation Loc, DeclarationName Entity);
1897 QualType BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
1898 Expr *ArraySize, unsigned Quals,
1899 SourceRange Brackets, DeclarationName Entity);
1900 QualType BuildVectorType(QualType T, Expr *VecSize, SourceLocation AttrLoc);
1901 QualType BuildExtVectorType(QualType T, Expr *ArraySize,
1902 SourceLocation AttrLoc);
1903 QualType BuildMatrixType(QualType T, Expr *NumRows, Expr *NumColumns,
1904 SourceLocation AttrLoc);
1905
1906 QualType BuildAddressSpaceAttr(QualType &T, LangAS ASIdx, Expr *AddrSpace,
1907 SourceLocation AttrLoc);
1908
1909 /// Same as above, but constructs the AddressSpace index if not provided.
1910 QualType BuildAddressSpaceAttr(QualType &T, Expr *AddrSpace,
1911 SourceLocation AttrLoc);
1912
1913 bool CheckQualifiedFunctionForTypeId(QualType T, SourceLocation Loc);
1914
1915 bool CheckFunctionReturnType(QualType T, SourceLocation Loc);
1916
1917 /// Build a function type.
1918 ///
1919 /// This routine checks the function type according to C++ rules and
1920 /// under the assumption that the result type and parameter types have
1921 /// just been instantiated from a template. It therefore duplicates
1922 /// some of the behavior of GetTypeForDeclarator, but in a much
1923 /// simpler form that is only suitable for this narrow use case.
1924 ///
1925 /// \param T The return type of the function.
1926 ///
1927 /// \param ParamTypes The parameter types of the function. This array
1928 /// will be modified to account for adjustments to the types of the
1929 /// function parameters.
1930 ///
1931 /// \param Loc The location of the entity whose type involves this
1932 /// function type or, if there is no such entity, the location of the
1933 /// type that will have function type.
1934 ///
1935 /// \param Entity The name of the entity that involves the function
1936 /// type, if known.
1937 ///
1938 /// \param EPI Extra information about the function type. Usually this will
1939 /// be taken from an existing function with the same prototype.
1940 ///
1941 /// \returns A suitable function type, if there are no errors. The
1942 /// unqualified type will always be a FunctionProtoType.
1943 /// Otherwise, returns a NULL type.
1944 QualType BuildFunctionType(QualType T,
1945 MutableArrayRef<QualType> ParamTypes,
1946 SourceLocation Loc, DeclarationName Entity,
1947 const FunctionProtoType::ExtProtoInfo &EPI);
1948
1949 QualType BuildMemberPointerType(QualType T, QualType Class,
1950 SourceLocation Loc,
1951 DeclarationName Entity);
1952 QualType BuildBlockPointerType(QualType T,
1953 SourceLocation Loc, DeclarationName Entity);
1954 QualType BuildParenType(QualType T);
1955 QualType BuildAtomicType(QualType T, SourceLocation Loc);
1956 QualType BuildReadPipeType(QualType T,
1957 SourceLocation Loc);
1958 QualType BuildWritePipeType(QualType T,
1959 SourceLocation Loc);
1960 QualType BuildExtIntType(bool IsUnsigned, Expr *BitWidth, SourceLocation Loc);
1961
1962 TypeSourceInfo *GetTypeForDeclarator(Declarator &D, Scope *S);
1963 TypeSourceInfo *GetTypeForDeclaratorCast(Declarator &D, QualType FromTy);
1964
1965 /// Package the given type and TSI into a ParsedType.
1966 ParsedType CreateParsedType(QualType T, TypeSourceInfo *TInfo);
1967 DeclarationNameInfo GetNameForDeclarator(Declarator &D);
1968 DeclarationNameInfo GetNameFromUnqualifiedId(const UnqualifiedId &Name);
1969 static QualType GetTypeFromParser(ParsedType Ty,
1970 TypeSourceInfo **TInfo = nullptr);
1971 CanThrowResult canThrow(const Stmt *E);
1972 /// Determine whether the callee of a particular function call can throw.
1973 /// E, D and Loc are all optional.
1974 static CanThrowResult canCalleeThrow(Sema &S, const Expr *E, const Decl *D,
1975 SourceLocation Loc = SourceLocation());
1976 const FunctionProtoType *ResolveExceptionSpec(SourceLocation Loc,
1977 const FunctionProtoType *FPT);
1978 void UpdateExceptionSpec(FunctionDecl *FD,
1979 const FunctionProtoType::ExceptionSpecInfo &ESI);
1980 bool CheckSpecifiedExceptionType(QualType &T, SourceRange Range);
1981 bool CheckDistantExceptionSpec(QualType T);
1982 bool CheckEquivalentExceptionSpec(FunctionDecl *Old, FunctionDecl *New);
1983 bool CheckEquivalentExceptionSpec(
1984 const FunctionProtoType *Old, SourceLocation OldLoc,
1985 const FunctionProtoType *New, SourceLocation NewLoc);
1986 bool CheckEquivalentExceptionSpec(
1987 const PartialDiagnostic &DiagID, const PartialDiagnostic & NoteID,
1988 const FunctionProtoType *Old, SourceLocation OldLoc,
1989 const FunctionProtoType *New, SourceLocation NewLoc);
1990 bool handlerCanCatch(QualType HandlerType, QualType ExceptionType);
1991 bool CheckExceptionSpecSubset(const PartialDiagnostic &DiagID,
1992 const PartialDiagnostic &NestedDiagID,
1993 const PartialDiagnostic &NoteID,
1994 const PartialDiagnostic &NoThrowDiagID,
1995 const FunctionProtoType *Superset,
1996 SourceLocation SuperLoc,
1997 const FunctionProtoType *Subset,
1998 SourceLocation SubLoc);
1999 bool CheckParamExceptionSpec(const PartialDiagnostic &NestedDiagID,
2000 const PartialDiagnostic &NoteID,
2001 const FunctionProtoType *Target,
2002 SourceLocation TargetLoc,
2003 const FunctionProtoType *Source,
2004 SourceLocation SourceLoc);
2005
2006 TypeResult ActOnTypeName(Scope *S, Declarator &D);
2007
2008 /// The parser has parsed the context-sensitive type 'instancetype'
2009 /// in an Objective-C message declaration. Return the appropriate type.
2010 ParsedType ActOnObjCInstanceType(SourceLocation Loc);
2011
2012 /// Abstract cl