Bug Summary

File:build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/clang/lib/AST/Decl.cpp
Warning:line 3974, column 5
Storage provided to placement new is only 0 bytes, whereas the allocated type requires 32 bytes

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name Decl.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 -mframe-pointer=none -relaxed-aliasing -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/build-llvm -resource-dir /usr/lib/llvm-15/lib/clang/15.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I tools/clang/lib/AST -I /build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/clang/lib/AST -I /build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/clang/include -I tools/clang/include -I include -I /build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/llvm/include -D _FORTIFY_SOURCE=2 -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-15/lib/clang/15.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/build-llvm=build-llvm -fmacro-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/= -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/build-llvm=build-llvm -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/= -O3 -Wno-unused-command-line-argument -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/build-llvm -fdebug-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/build-llvm=build-llvm -fdebug-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/= -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fcolor-diagnostics -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2022-04-20-140412-16051-1 -x c++ /build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/clang/lib/AST/Decl.cpp

/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/clang/lib/AST/Decl.cpp

1//===- Decl.cpp - Declaration AST Node Implementation ---------------------===//
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 implements the Decl subclasses.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/AST/Decl.h"
14#include "Linkage.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/ASTDiagnostic.h"
17#include "clang/AST/ASTLambda.h"
18#include "clang/AST/ASTMutationListener.h"
19#include "clang/AST/Attr.h"
20#include "clang/AST/CanonicalType.h"
21#include "clang/AST/DeclBase.h"
22#include "clang/AST/DeclCXX.h"
23#include "clang/AST/DeclObjC.h"
24#include "clang/AST/DeclOpenMP.h"
25#include "clang/AST/DeclTemplate.h"
26#include "clang/AST/DeclarationName.h"
27#include "clang/AST/Expr.h"
28#include "clang/AST/ExprCXX.h"
29#include "clang/AST/ExternalASTSource.h"
30#include "clang/AST/ODRHash.h"
31#include "clang/AST/PrettyDeclStackTrace.h"
32#include "clang/AST/PrettyPrinter.h"
33#include "clang/AST/Randstruct.h"
34#include "clang/AST/RecordLayout.h"
35#include "clang/AST/Redeclarable.h"
36#include "clang/AST/Stmt.h"
37#include "clang/AST/TemplateBase.h"
38#include "clang/AST/Type.h"
39#include "clang/AST/TypeLoc.h"
40#include "clang/Basic/Builtins.h"
41#include "clang/Basic/IdentifierTable.h"
42#include "clang/Basic/LLVM.h"
43#include "clang/Basic/LangOptions.h"
44#include "clang/Basic/Linkage.h"
45#include "clang/Basic/Module.h"
46#include "clang/Basic/NoSanitizeList.h"
47#include "clang/Basic/PartialDiagnostic.h"
48#include "clang/Basic/Sanitizers.h"
49#include "clang/Basic/SourceLocation.h"
50#include "clang/Basic/SourceManager.h"
51#include "clang/Basic/Specifiers.h"
52#include "clang/Basic/TargetCXXABI.h"
53#include "clang/Basic/TargetInfo.h"
54#include "clang/Basic/Visibility.h"
55#include "llvm/ADT/APSInt.h"
56#include "llvm/ADT/ArrayRef.h"
57#include "llvm/ADT/None.h"
58#include "llvm/ADT/Optional.h"
59#include "llvm/ADT/STLExtras.h"
60#include "llvm/ADT/SmallVector.h"
61#include "llvm/ADT/StringRef.h"
62#include "llvm/ADT/StringSwitch.h"
63#include "llvm/ADT/Triple.h"
64#include "llvm/Support/Casting.h"
65#include "llvm/Support/ErrorHandling.h"
66#include "llvm/Support/raw_ostream.h"
67#include <algorithm>
68#include <cassert>
69#include <cstddef>
70#include <cstring>
71#include <memory>
72#include <string>
73#include <tuple>
74#include <type_traits>
75
76using namespace clang;
77
78Decl *clang::getPrimaryMergedDecl(Decl *D) {
79 return D->getASTContext().getPrimaryMergedDecl(D);
80}
81
82void PrettyDeclStackTraceEntry::print(raw_ostream &OS) const {
83 SourceLocation Loc = this->Loc;
84 if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
85 if (Loc.isValid()) {
86 Loc.print(OS, Context.getSourceManager());
87 OS << ": ";
88 }
89 OS << Message;
90
91 if (auto *ND = dyn_cast_or_null<NamedDecl>(TheDecl)) {
92 OS << " '";
93 ND->getNameForDiagnostic(OS, Context.getPrintingPolicy(), true);
94 OS << "'";
95 }
96
97 OS << '\n';
98}
99
100// Defined here so that it can be inlined into its direct callers.
101bool Decl::isOutOfLine() const {
102 return !getLexicalDeclContext()->Equals(getDeclContext());
103}
104
105TranslationUnitDecl::TranslationUnitDecl(ASTContext &ctx)
106 : Decl(TranslationUnit, nullptr, SourceLocation()),
107 DeclContext(TranslationUnit), redeclarable_base(ctx), Ctx(ctx) {}
108
109//===----------------------------------------------------------------------===//
110// NamedDecl Implementation
111//===----------------------------------------------------------------------===//
112
113// Visibility rules aren't rigorously externally specified, but here
114// are the basic principles behind what we implement:
115//
116// 1. An explicit visibility attribute is generally a direct expression
117// of the user's intent and should be honored. Only the innermost
118// visibility attribute applies. If no visibility attribute applies,
119// global visibility settings are considered.
120//
121// 2. There is one caveat to the above: on or in a template pattern,
122// an explicit visibility attribute is just a default rule, and
123// visibility can be decreased by the visibility of template
124// arguments. But this, too, has an exception: an attribute on an
125// explicit specialization or instantiation causes all the visibility
126// restrictions of the template arguments to be ignored.
127//
128// 3. A variable that does not otherwise have explicit visibility can
129// be restricted by the visibility of its type.
130//
131// 4. A visibility restriction is explicit if it comes from an
132// attribute (or something like it), not a global visibility setting.
133// When emitting a reference to an external symbol, visibility
134// restrictions are ignored unless they are explicit.
135//
136// 5. When computing the visibility of a non-type, including a
137// non-type member of a class, only non-type visibility restrictions
138// are considered: the 'visibility' attribute, global value-visibility
139// settings, and a few special cases like __private_extern.
140//
141// 6. When computing the visibility of a type, including a type member
142// of a class, only type visibility restrictions are considered:
143// the 'type_visibility' attribute and global type-visibility settings.
144// However, a 'visibility' attribute counts as a 'type_visibility'
145// attribute on any declaration that only has the former.
146//
147// The visibility of a "secondary" entity, like a template argument,
148// is computed using the kind of that entity, not the kind of the
149// primary entity for which we are computing visibility. For example,
150// the visibility of a specialization of either of these templates:
151// template <class T, bool (&compare)(T, X)> bool has_match(list<T>, X);
152// template <class T, bool (&compare)(T, X)> class matcher;
153// is restricted according to the type visibility of the argument 'T',
154// the type visibility of 'bool(&)(T,X)', and the value visibility of
155// the argument function 'compare'. That 'has_match' is a value
156// and 'matcher' is a type only matters when looking for attributes
157// and settings from the immediate context.
158
159/// Does this computation kind permit us to consider additional
160/// visibility settings from attributes and the like?
161static bool hasExplicitVisibilityAlready(LVComputationKind computation) {
162 return computation.IgnoreExplicitVisibility;
163}
164
165/// Given an LVComputationKind, return one of the same type/value sort
166/// that records that it already has explicit visibility.
167static LVComputationKind
168withExplicitVisibilityAlready(LVComputationKind Kind) {
169 Kind.IgnoreExplicitVisibility = true;
170 return Kind;
171}
172
173static Optional<Visibility> getExplicitVisibility(const NamedDecl *D,
174 LVComputationKind kind) {
175 assert(!kind.IgnoreExplicitVisibility &&(static_cast <bool> (!kind.IgnoreExplicitVisibility &&
"asking for explicit visibility when we shouldn't be") ? void
(0) : __assert_fail ("!kind.IgnoreExplicitVisibility && \"asking for explicit visibility when we shouldn't be\""
, "clang/lib/AST/Decl.cpp", 176, __extension__ __PRETTY_FUNCTION__
))
176 "asking for explicit visibility when we shouldn't be")(static_cast <bool> (!kind.IgnoreExplicitVisibility &&
"asking for explicit visibility when we shouldn't be") ? void
(0) : __assert_fail ("!kind.IgnoreExplicitVisibility && \"asking for explicit visibility when we shouldn't be\""
, "clang/lib/AST/Decl.cpp", 176, __extension__ __PRETTY_FUNCTION__
))
;
177 return D->getExplicitVisibility(kind.getExplicitVisibilityKind());
178}
179
180/// Is the given declaration a "type" or a "value" for the purposes of
181/// visibility computation?
182static bool usesTypeVisibility(const NamedDecl *D) {
183 return isa<TypeDecl>(D) ||
184 isa<ClassTemplateDecl>(D) ||
185 isa<ObjCInterfaceDecl>(D);
186}
187
188/// Does the given declaration have member specialization information,
189/// and if so, is it an explicit specialization?
190template <class T> static typename
191std::enable_if<!std::is_base_of<RedeclarableTemplateDecl, T>::value, bool>::type
192isExplicitMemberSpecialization(const T *D) {
193 if (const MemberSpecializationInfo *member =
194 D->getMemberSpecializationInfo()) {
195 return member->isExplicitSpecialization();
196 }
197 return false;
198}
199
200/// For templates, this question is easier: a member template can't be
201/// explicitly instantiated, so there's a single bit indicating whether
202/// or not this is an explicit member specialization.
203static bool isExplicitMemberSpecialization(const RedeclarableTemplateDecl *D) {
204 return D->isMemberSpecialization();
205}
206
207/// Given a visibility attribute, return the explicit visibility
208/// associated with it.
209template <class T>
210static Visibility getVisibilityFromAttr(const T *attr) {
211 switch (attr->getVisibility()) {
212 case T::Default:
213 return DefaultVisibility;
214 case T::Hidden:
215 return HiddenVisibility;
216 case T::Protected:
217 return ProtectedVisibility;
218 }
219 llvm_unreachable("bad visibility kind")::llvm::llvm_unreachable_internal("bad visibility kind", "clang/lib/AST/Decl.cpp"
, 219)
;
220}
221
222/// Return the explicit visibility of the given declaration.
223static Optional<Visibility> getVisibilityOf(const NamedDecl *D,
224 NamedDecl::ExplicitVisibilityKind kind) {
225 // If we're ultimately computing the visibility of a type, look for
226 // a 'type_visibility' attribute before looking for 'visibility'.
227 if (kind == NamedDecl::VisibilityForType) {
228 if (const auto *A = D->getAttr<TypeVisibilityAttr>()) {
229 return getVisibilityFromAttr(A);
230 }
231 }
232
233 // If this declaration has an explicit visibility attribute, use it.
234 if (const auto *A = D->getAttr<VisibilityAttr>()) {
235 return getVisibilityFromAttr(A);
236 }
237
238 return None;
239}
240
241LinkageInfo LinkageComputer::getLVForType(const Type &T,
242 LVComputationKind computation) {
243 if (computation.IgnoreAllVisibility)
244 return LinkageInfo(T.getLinkage(), DefaultVisibility, true);
245 return getTypeLinkageAndVisibility(&T);
246}
247
248/// Get the most restrictive linkage for the types in the given
249/// template parameter list. For visibility purposes, template
250/// parameters are part of the signature of a template.
251LinkageInfo LinkageComputer::getLVForTemplateParameterList(
252 const TemplateParameterList *Params, LVComputationKind computation) {
253 LinkageInfo LV;
254 for (const NamedDecl *P : *Params) {
255 // Template type parameters are the most common and never
256 // contribute to visibility, pack or not.
257 if (isa<TemplateTypeParmDecl>(P))
258 continue;
259
260 // Non-type template parameters can be restricted by the value type, e.g.
261 // template <enum X> class A { ... };
262 // We have to be careful here, though, because we can be dealing with
263 // dependent types.
264 if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
265 // Handle the non-pack case first.
266 if (!NTTP->isExpandedParameterPack()) {
267 if (!NTTP->getType()->isDependentType()) {
268 LV.merge(getLVForType(*NTTP->getType(), computation));
269 }
270 continue;
271 }
272
273 // Look at all the types in an expanded pack.
274 for (unsigned i = 0, n = NTTP->getNumExpansionTypes(); i != n; ++i) {
275 QualType type = NTTP->getExpansionType(i);
276 if (!type->isDependentType())
277 LV.merge(getTypeLinkageAndVisibility(type));
278 }
279 continue;
280 }
281
282 // Template template parameters can be restricted by their
283 // template parameters, recursively.
284 const auto *TTP = cast<TemplateTemplateParmDecl>(P);
285
286 // Handle the non-pack case first.
287 if (!TTP->isExpandedParameterPack()) {
288 LV.merge(getLVForTemplateParameterList(TTP->getTemplateParameters(),
289 computation));
290 continue;
291 }
292
293 // Look at all expansions in an expanded pack.
294 for (unsigned i = 0, n = TTP->getNumExpansionTemplateParameters();
295 i != n; ++i) {
296 LV.merge(getLVForTemplateParameterList(
297 TTP->getExpansionTemplateParameters(i), computation));
298 }
299 }
300
301 return LV;
302}
303
304static const Decl *getOutermostFuncOrBlockContext(const Decl *D) {
305 const Decl *Ret = nullptr;
306 const DeclContext *DC = D->getDeclContext();
307 while (DC->getDeclKind() != Decl::TranslationUnit) {
308 if (isa<FunctionDecl>(DC) || isa<BlockDecl>(DC))
309 Ret = cast<Decl>(DC);
310 DC = DC->getParent();
311 }
312 return Ret;
313}
314
315/// Get the most restrictive linkage for the types and
316/// declarations in the given template argument list.
317///
318/// Note that we don't take an LVComputationKind because we always
319/// want to honor the visibility of template arguments in the same way.
320LinkageInfo
321LinkageComputer::getLVForTemplateArgumentList(ArrayRef<TemplateArgument> Args,
322 LVComputationKind computation) {
323 LinkageInfo LV;
324
325 for (const TemplateArgument &Arg : Args) {
326 switch (Arg.getKind()) {
327 case TemplateArgument::Null:
328 case TemplateArgument::Integral:
329 case TemplateArgument::Expression:
330 continue;
331
332 case TemplateArgument::Type:
333 LV.merge(getLVForType(*Arg.getAsType(), computation));
334 continue;
335
336 case TemplateArgument::Declaration: {
337 const NamedDecl *ND = Arg.getAsDecl();
338 assert(!usesTypeVisibility(ND))(static_cast <bool> (!usesTypeVisibility(ND)) ? void (0
) : __assert_fail ("!usesTypeVisibility(ND)", "clang/lib/AST/Decl.cpp"
, 338, __extension__ __PRETTY_FUNCTION__))
;
339 LV.merge(getLVForDecl(ND, computation));
340 continue;
341 }
342
343 case TemplateArgument::NullPtr:
344 LV.merge(getTypeLinkageAndVisibility(Arg.getNullPtrType()));
345 continue;
346
347 case TemplateArgument::Template:
348 case TemplateArgument::TemplateExpansion:
349 if (TemplateDecl *Template =
350 Arg.getAsTemplateOrTemplatePattern().getAsTemplateDecl())
351 LV.merge(getLVForDecl(Template, computation));
352 continue;
353
354 case TemplateArgument::Pack:
355 LV.merge(getLVForTemplateArgumentList(Arg.getPackAsArray(), computation));
356 continue;
357 }
358 llvm_unreachable("bad template argument kind")::llvm::llvm_unreachable_internal("bad template argument kind"
, "clang/lib/AST/Decl.cpp", 358)
;
359 }
360
361 return LV;
362}
363
364LinkageInfo
365LinkageComputer::getLVForTemplateArgumentList(const TemplateArgumentList &TArgs,
366 LVComputationKind computation) {
367 return getLVForTemplateArgumentList(TArgs.asArray(), computation);
368}
369
370static bool shouldConsiderTemplateVisibility(const FunctionDecl *fn,
371 const FunctionTemplateSpecializationInfo *specInfo) {
372 // Include visibility from the template parameters and arguments
373 // only if this is not an explicit instantiation or specialization
374 // with direct explicit visibility. (Implicit instantiations won't
375 // have a direct attribute.)
376 if (!specInfo->isExplicitInstantiationOrSpecialization())
377 return true;
378
379 return !fn->hasAttr<VisibilityAttr>();
380}
381
382/// Merge in template-related linkage and visibility for the given
383/// function template specialization.
384///
385/// We don't need a computation kind here because we can assume
386/// LVForValue.
387///
388/// \param[out] LV the computation to use for the parent
389void LinkageComputer::mergeTemplateLV(
390 LinkageInfo &LV, const FunctionDecl *fn,
391 const FunctionTemplateSpecializationInfo *specInfo,
392 LVComputationKind computation) {
393 bool considerVisibility =
394 shouldConsiderTemplateVisibility(fn, specInfo);
395
396 FunctionTemplateDecl *temp = specInfo->getTemplate();
397
398 // Merge information from the template declaration.
399 LinkageInfo tempLV = getLVForDecl(temp, computation);
400 // The linkage of the specialization should be consistent with the
401 // template declaration.
402 LV.setLinkage(tempLV.getLinkage());
403
404 // Merge information from the template parameters.
405 LinkageInfo paramsLV =
406 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
407 LV.mergeMaybeWithVisibility(paramsLV, considerVisibility);
408
409 // Merge information from the template arguments.
410 const TemplateArgumentList &templateArgs = *specInfo->TemplateArguments;
411 LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
412 LV.mergeMaybeWithVisibility(argsLV, considerVisibility);
413}
414
415/// Does the given declaration have a direct visibility attribute
416/// that would match the given rules?
417static bool hasDirectVisibilityAttribute(const NamedDecl *D,
418 LVComputationKind computation) {
419 if (computation.IgnoreAllVisibility)
420 return false;
421
422 return (computation.isTypeVisibility() && D->hasAttr<TypeVisibilityAttr>()) ||
423 D->hasAttr<VisibilityAttr>();
424}
425
426/// Should we consider visibility associated with the template
427/// arguments and parameters of the given class template specialization?
428static bool shouldConsiderTemplateVisibility(
429 const ClassTemplateSpecializationDecl *spec,
430 LVComputationKind computation) {
431 // Include visibility from the template parameters and arguments
432 // only if this is not an explicit instantiation or specialization
433 // with direct explicit visibility (and note that implicit
434 // instantiations won't have a direct attribute).
435 //
436 // Furthermore, we want to ignore template parameters and arguments
437 // for an explicit specialization when computing the visibility of a
438 // member thereof with explicit visibility.
439 //
440 // This is a bit complex; let's unpack it.
441 //
442 // An explicit class specialization is an independent, top-level
443 // declaration. As such, if it or any of its members has an
444 // explicit visibility attribute, that must directly express the
445 // user's intent, and we should honor it. The same logic applies to
446 // an explicit instantiation of a member of such a thing.
447
448 // Fast path: if this is not an explicit instantiation or
449 // specialization, we always want to consider template-related
450 // visibility restrictions.
451 if (!spec->isExplicitInstantiationOrSpecialization())
452 return true;
453
454 // This is the 'member thereof' check.
455 if (spec->isExplicitSpecialization() &&
456 hasExplicitVisibilityAlready(computation))
457 return false;
458
459 return !hasDirectVisibilityAttribute(spec, computation);
460}
461
462/// Merge in template-related linkage and visibility for the given
463/// class template specialization.
464void LinkageComputer::mergeTemplateLV(
465 LinkageInfo &LV, const ClassTemplateSpecializationDecl *spec,
466 LVComputationKind computation) {
467 bool considerVisibility = shouldConsiderTemplateVisibility(spec, computation);
468
469 // Merge information from the template parameters, but ignore
470 // visibility if we're only considering template arguments.
471
472 ClassTemplateDecl *temp = spec->getSpecializedTemplate();
473 LinkageInfo tempLV =
474 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
475 LV.mergeMaybeWithVisibility(tempLV,
476 considerVisibility && !hasExplicitVisibilityAlready(computation));
477
478 // Merge information from the template arguments. We ignore
479 // template-argument visibility if we've got an explicit
480 // instantiation with a visibility attribute.
481 const TemplateArgumentList &templateArgs = spec->getTemplateArgs();
482 LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
483 if (considerVisibility)
484 LV.mergeVisibility(argsLV);
485 LV.mergeExternalVisibility(argsLV);
486}
487
488/// Should we consider visibility associated with the template
489/// arguments and parameters of the given variable template
490/// specialization? As usual, follow class template specialization
491/// logic up to initialization.
492static bool shouldConsiderTemplateVisibility(
493 const VarTemplateSpecializationDecl *spec,
494 LVComputationKind computation) {
495 // Include visibility from the template parameters and arguments
496 // only if this is not an explicit instantiation or specialization
497 // with direct explicit visibility (and note that implicit
498 // instantiations won't have a direct attribute).
499 if (!spec->isExplicitInstantiationOrSpecialization())
500 return true;
501
502 // An explicit variable specialization is an independent, top-level
503 // declaration. As such, if it has an explicit visibility attribute,
504 // that must directly express the user's intent, and we should honor
505 // it.
506 if (spec->isExplicitSpecialization() &&
507 hasExplicitVisibilityAlready(computation))
508 return false;
509
510 return !hasDirectVisibilityAttribute(spec, computation);
511}
512
513/// Merge in template-related linkage and visibility for the given
514/// variable template specialization. As usual, follow class template
515/// specialization logic up to initialization.
516void LinkageComputer::mergeTemplateLV(LinkageInfo &LV,
517 const VarTemplateSpecializationDecl *spec,
518 LVComputationKind computation) {
519 bool considerVisibility = shouldConsiderTemplateVisibility(spec, computation);
520
521 // Merge information from the template parameters, but ignore
522 // visibility if we're only considering template arguments.
523
524 VarTemplateDecl *temp = spec->getSpecializedTemplate();
525 LinkageInfo tempLV =
526 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
527 LV.mergeMaybeWithVisibility(tempLV,
528 considerVisibility && !hasExplicitVisibilityAlready(computation));
529
530 // Merge information from the template arguments. We ignore
531 // template-argument visibility if we've got an explicit
532 // instantiation with a visibility attribute.
533 const TemplateArgumentList &templateArgs = spec->getTemplateArgs();
534 LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
535 if (considerVisibility)
536 LV.mergeVisibility(argsLV);
537 LV.mergeExternalVisibility(argsLV);
538}
539
540static bool useInlineVisibilityHidden(const NamedDecl *D) {
541 // FIXME: we should warn if -fvisibility-inlines-hidden is used with c.
542 const LangOptions &Opts = D->getASTContext().getLangOpts();
543 if (!Opts.CPlusPlus || !Opts.InlineVisibilityHidden)
544 return false;
545
546 const auto *FD = dyn_cast<FunctionDecl>(D);
547 if (!FD)
548 return false;
549
550 TemplateSpecializationKind TSK = TSK_Undeclared;
551 if (FunctionTemplateSpecializationInfo *spec
552 = FD->getTemplateSpecializationInfo()) {
553 TSK = spec->getTemplateSpecializationKind();
554 } else if (MemberSpecializationInfo *MSI =
555 FD->getMemberSpecializationInfo()) {
556 TSK = MSI->getTemplateSpecializationKind();
557 }
558
559 const FunctionDecl *Def = nullptr;
560 // InlineVisibilityHidden only applies to definitions, and
561 // isInlined() only gives meaningful answers on definitions
562 // anyway.
563 return TSK != TSK_ExplicitInstantiationDeclaration &&
564 TSK != TSK_ExplicitInstantiationDefinition &&
565 FD->hasBody(Def) && Def->isInlined() && !Def->hasAttr<GNUInlineAttr>();
566}
567
568template <typename T> static bool isFirstInExternCContext(T *D) {
569 const T *First = D->getFirstDecl();
570 return First->isInExternCContext();
571}
572
573static bool isSingleLineLanguageLinkage(const Decl &D) {
574 if (const auto *SD = dyn_cast<LinkageSpecDecl>(D.getDeclContext()))
575 if (!SD->hasBraces())
576 return true;
577 return false;
578}
579
580/// Determine whether D is declared in the purview of a named module.
581static bool isInModulePurview(const NamedDecl *D) {
582 if (auto *M = D->getOwningModule())
583 return M->isModulePurview();
584 return false;
585}
586
587static bool isExportedFromModuleInterfaceUnit(const NamedDecl *D) {
588 // FIXME: Handle isModulePrivate.
589 switch (D->getModuleOwnershipKind()) {
590 case Decl::ModuleOwnershipKind::Unowned:
591 case Decl::ModuleOwnershipKind::ModulePrivate:
592 return false;
593 case Decl::ModuleOwnershipKind::Visible:
594 case Decl::ModuleOwnershipKind::VisibleWhenImported:
595 return isInModulePurview(D);
596 }
597 llvm_unreachable("unexpected module ownership kind")::llvm::llvm_unreachable_internal("unexpected module ownership kind"
, "clang/lib/AST/Decl.cpp", 597)
;
598}
599
600static LinkageInfo getInternalLinkageFor(const NamedDecl *D) {
601 // (for the modules ts) Internal linkage declarations within a module
602 // interface unit are modeled as "module-internal linkage", which means that
603 // they have internal linkage formally but can be indirectly accessed from
604 // outside the module via inline functions and templates defined within the
605 // module.
606 if (isInModulePurview(D) && D->getASTContext().getLangOpts().ModulesTS)
607 return LinkageInfo(ModuleInternalLinkage, DefaultVisibility, false);
608
609 return LinkageInfo::internal();
610}
611
612static LinkageInfo getExternalLinkageFor(const NamedDecl *D) {
613 // C++ Modules TS [basic.link]/6.8:
614 // - A name declared at namespace scope that does not have internal linkage
615 // by the previous rules and that is introduced by a non-exported
616 // declaration has module linkage.
617 //
618 // [basic.namespace.general]/p2
619 // A namespace is never attached to a named module and never has a name with
620 // module linkage.
621 if (isInModulePurview(D) &&
622 !isExportedFromModuleInterfaceUnit(
623 cast<NamedDecl>(D->getCanonicalDecl())) &&
624 !isa<NamespaceDecl>(D))
625 return LinkageInfo(ModuleLinkage, DefaultVisibility, false);
626
627 return LinkageInfo::external();
628}
629
630static StorageClass getStorageClass(const Decl *D) {
631 if (auto *TD = dyn_cast<TemplateDecl>(D))
632 D = TD->getTemplatedDecl();
633 if (D) {
634 if (auto *VD = dyn_cast<VarDecl>(D))
635 return VD->getStorageClass();
636 if (auto *FD = dyn_cast<FunctionDecl>(D))
637 return FD->getStorageClass();
638 }
639 return SC_None;
640}
641
642LinkageInfo
643LinkageComputer::getLVForNamespaceScopeDecl(const NamedDecl *D,
644 LVComputationKind computation,
645 bool IgnoreVarTypeLinkage) {
646 assert(D->getDeclContext()->getRedeclContext()->isFileContext() &&(static_cast <bool> (D->getDeclContext()->getRedeclContext
()->isFileContext() && "Not a name having namespace scope"
) ? void (0) : __assert_fail ("D->getDeclContext()->getRedeclContext()->isFileContext() && \"Not a name having namespace scope\""
, "clang/lib/AST/Decl.cpp", 647, __extension__ __PRETTY_FUNCTION__
))
647 "Not a name having namespace scope")(static_cast <bool> (D->getDeclContext()->getRedeclContext
()->isFileContext() && "Not a name having namespace scope"
) ? void (0) : __assert_fail ("D->getDeclContext()->getRedeclContext()->isFileContext() && \"Not a name having namespace scope\""
, "clang/lib/AST/Decl.cpp", 647, __extension__ __PRETTY_FUNCTION__
))
;
648 ASTContext &Context = D->getASTContext();
649
650 // C++ [basic.link]p3:
651 // A name having namespace scope (3.3.6) has internal linkage if it
652 // is the name of
653
654 if (getStorageClass(D->getCanonicalDecl()) == SC_Static) {
655 // - a variable, variable template, function, or function template
656 // that is explicitly declared static; or
657 // (This bullet corresponds to C99 6.2.2p3.)
658 return getInternalLinkageFor(D);
659 }
660
661 if (const auto *Var = dyn_cast<VarDecl>(D)) {
662 // - a non-template variable of non-volatile const-qualified type, unless
663 // - it is explicitly declared extern, or
664 // - it is inline or exported, or
665 // - it was previously declared and the prior declaration did not have
666 // internal linkage
667 // (There is no equivalent in C99.)
668 if (Context.getLangOpts().CPlusPlus &&
669 Var->getType().isConstQualified() &&
670 !Var->getType().isVolatileQualified() &&
671 !Var->isInline() &&
672 !isExportedFromModuleInterfaceUnit(Var) &&
673 !isa<VarTemplateSpecializationDecl>(Var) &&
674 !Var->getDescribedVarTemplate()) {
675 const VarDecl *PrevVar = Var->getPreviousDecl();
676 if (PrevVar)
677 return getLVForDecl(PrevVar, computation);
678
679 if (Var->getStorageClass() != SC_Extern &&
680 Var->getStorageClass() != SC_PrivateExtern &&
681 !isSingleLineLanguageLinkage(*Var))
682 return getInternalLinkageFor(Var);
683 }
684
685 for (const VarDecl *PrevVar = Var->getPreviousDecl(); PrevVar;
686 PrevVar = PrevVar->getPreviousDecl()) {
687 if (PrevVar->getStorageClass() == SC_PrivateExtern &&
688 Var->getStorageClass() == SC_None)
689 return getDeclLinkageAndVisibility(PrevVar);
690 // Explicitly declared static.
691 if (PrevVar->getStorageClass() == SC_Static)
692 return getInternalLinkageFor(Var);
693 }
694 } else if (const auto *IFD = dyn_cast<IndirectFieldDecl>(D)) {
695 // - a data member of an anonymous union.
696 const VarDecl *VD = IFD->getVarDecl();
697 assert(VD && "Expected a VarDecl in this IndirectFieldDecl!")(static_cast <bool> (VD && "Expected a VarDecl in this IndirectFieldDecl!"
) ? void (0) : __assert_fail ("VD && \"Expected a VarDecl in this IndirectFieldDecl!\""
, "clang/lib/AST/Decl.cpp", 697, __extension__ __PRETTY_FUNCTION__
))
;
698 return getLVForNamespaceScopeDecl(VD, computation, IgnoreVarTypeLinkage);
699 }
700 assert(!isa<FieldDecl>(D) && "Didn't expect a FieldDecl!")(static_cast <bool> (!isa<FieldDecl>(D) &&
"Didn't expect a FieldDecl!") ? void (0) : __assert_fail ("!isa<FieldDecl>(D) && \"Didn't expect a FieldDecl!\""
, "clang/lib/AST/Decl.cpp", 700, __extension__ __PRETTY_FUNCTION__
))
;
701
702 // FIXME: This gives internal linkage to names that should have no linkage
703 // (those not covered by [basic.link]p6).
704 if (D->isInAnonymousNamespace()) {
705 const auto *Var = dyn_cast<VarDecl>(D);
706 const auto *Func = dyn_cast<FunctionDecl>(D);
707 // FIXME: The check for extern "C" here is not justified by the standard
708 // wording, but we retain it from the pre-DR1113 model to avoid breaking
709 // code.
710 //
711 // C++11 [basic.link]p4:
712 // An unnamed namespace or a namespace declared directly or indirectly
713 // within an unnamed namespace has internal linkage.
714 if ((!Var || !isFirstInExternCContext(Var)) &&
715 (!Func || !isFirstInExternCContext(Func)))
716 return getInternalLinkageFor(D);
717 }
718
719 // Set up the defaults.
720
721 // C99 6.2.2p5:
722 // If the declaration of an identifier for an object has file
723 // scope and no storage-class specifier, its linkage is
724 // external.
725 LinkageInfo LV = getExternalLinkageFor(D);
726
727 if (!hasExplicitVisibilityAlready(computation)) {
728 if (Optional<Visibility> Vis = getExplicitVisibility(D, computation)) {
729 LV.mergeVisibility(*Vis, true);
730 } else {
731 // If we're declared in a namespace with a visibility attribute,
732 // use that namespace's visibility, and it still counts as explicit.
733 for (const DeclContext *DC = D->getDeclContext();
734 !isa<TranslationUnitDecl>(DC);
735 DC = DC->getParent()) {
736 const auto *ND = dyn_cast<NamespaceDecl>(DC);
737 if (!ND) continue;
738 if (Optional<Visibility> Vis = getExplicitVisibility(ND, computation)) {
739 LV.mergeVisibility(*Vis, true);
740 break;
741 }
742 }
743 }
744
745 // Add in global settings if the above didn't give us direct visibility.
746 if (!LV.isVisibilityExplicit()) {
747 // Use global type/value visibility as appropriate.
748 Visibility globalVisibility =
749 computation.isValueVisibility()
750 ? Context.getLangOpts().getValueVisibilityMode()
751 : Context.getLangOpts().getTypeVisibilityMode();
752 LV.mergeVisibility(globalVisibility, /*explicit*/ false);
753
754 // If we're paying attention to global visibility, apply
755 // -finline-visibility-hidden if this is an inline method.
756 if (useInlineVisibilityHidden(D))
757 LV.mergeVisibility(HiddenVisibility, /*visibilityExplicit=*/false);
758 }
759 }
760
761 // C++ [basic.link]p4:
762
763 // A name having namespace scope that has not been given internal linkage
764 // above and that is the name of
765 // [...bullets...]
766 // has its linkage determined as follows:
767 // - if the enclosing namespace has internal linkage, the name has
768 // internal linkage; [handled above]
769 // - otherwise, if the declaration of the name is attached to a named
770 // module and is not exported, the name has module linkage;
771 // - otherwise, the name has external linkage.
772 // LV is currently set up to handle the last two bullets.
773 //
774 // The bullets are:
775
776 // - a variable; or
777 if (const auto *Var = dyn_cast<VarDecl>(D)) {
778 // GCC applies the following optimization to variables and static
779 // data members, but not to functions:
780 //
781 // Modify the variable's LV by the LV of its type unless this is
782 // C or extern "C". This follows from [basic.link]p9:
783 // A type without linkage shall not be used as the type of a
784 // variable or function with external linkage unless
785 // - the entity has C language linkage, or
786 // - the entity is declared within an unnamed namespace, or
787 // - the entity is not used or is defined in the same
788 // translation unit.
789 // and [basic.link]p10:
790 // ...the types specified by all declarations referring to a
791 // given variable or function shall be identical...
792 // C does not have an equivalent rule.
793 //
794 // Ignore this if we've got an explicit attribute; the user
795 // probably knows what they're doing.
796 //
797 // Note that we don't want to make the variable non-external
798 // because of this, but unique-external linkage suits us.
799
800 if (Context.getLangOpts().CPlusPlus && !isFirstInExternCContext(Var) &&
801 !IgnoreVarTypeLinkage) {
802 LinkageInfo TypeLV = getLVForType(*Var->getType(), computation);
803 if (!isExternallyVisible(TypeLV.getLinkage()))
804 return LinkageInfo::uniqueExternal();
805 if (!LV.isVisibilityExplicit())
806 LV.mergeVisibility(TypeLV);
807 }
808
809 if (Var->getStorageClass() == SC_PrivateExtern)
810 LV.mergeVisibility(HiddenVisibility, true);
811
812 // Note that Sema::MergeVarDecl already takes care of implementing
813 // C99 6.2.2p4 and propagating the visibility attribute, so we don't have
814 // to do it here.
815
816 // As per function and class template specializations (below),
817 // consider LV for the template and template arguments. We're at file
818 // scope, so we do not need to worry about nested specializations.
819 if (const auto *spec = dyn_cast<VarTemplateSpecializationDecl>(Var)) {
820 mergeTemplateLV(LV, spec, computation);
821 }
822
823 // - a function; or
824 } else if (const auto *Function = dyn_cast<FunctionDecl>(D)) {
825 // In theory, we can modify the function's LV by the LV of its
826 // type unless it has C linkage (see comment above about variables
827 // for justification). In practice, GCC doesn't do this, so it's
828 // just too painful to make work.
829
830 if (Function->getStorageClass() == SC_PrivateExtern)
831 LV.mergeVisibility(HiddenVisibility, true);
832
833 // Note that Sema::MergeCompatibleFunctionDecls already takes care of
834 // merging storage classes and visibility attributes, so we don't have to
835 // look at previous decls in here.
836
837 // In C++, then if the type of the function uses a type with
838 // unique-external linkage, it's not legally usable from outside
839 // this translation unit. However, we should use the C linkage
840 // rules instead for extern "C" declarations.
841 if (Context.getLangOpts().CPlusPlus && !isFirstInExternCContext(Function)) {
842 // Only look at the type-as-written. Otherwise, deducing the return type
843 // of a function could change its linkage.
844 QualType TypeAsWritten = Function->getType();
845 if (TypeSourceInfo *TSI = Function->getTypeSourceInfo())
846 TypeAsWritten = TSI->getType();
847 if (!isExternallyVisible(TypeAsWritten->getLinkage()))
848 return LinkageInfo::uniqueExternal();
849 }
850
851 // Consider LV from the template and the template arguments.
852 // We're at file scope, so we do not need to worry about nested
853 // specializations.
854 if (FunctionTemplateSpecializationInfo *specInfo
855 = Function->getTemplateSpecializationInfo()) {
856 mergeTemplateLV(LV, Function, specInfo, computation);
857 }
858
859 // - a named class (Clause 9), or an unnamed class defined in a
860 // typedef declaration in which the class has the typedef name
861 // for linkage purposes (7.1.3); or
862 // - a named enumeration (7.2), or an unnamed enumeration
863 // defined in a typedef declaration in which the enumeration
864 // has the typedef name for linkage purposes (7.1.3); or
865 } else if (const auto *Tag = dyn_cast<TagDecl>(D)) {
866 // Unnamed tags have no linkage.
867 if (!Tag->hasNameForLinkage())
868 return LinkageInfo::none();
869
870 // If this is a class template specialization, consider the
871 // linkage of the template and template arguments. We're at file
872 // scope, so we do not need to worry about nested specializations.
873 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(Tag)) {
874 mergeTemplateLV(LV, spec, computation);
875 }
876
877 // FIXME: This is not part of the C++ standard any more.
878 // - an enumerator belonging to an enumeration with external linkage; or
879 } else if (isa<EnumConstantDecl>(D)) {
880 LinkageInfo EnumLV = getLVForDecl(cast<NamedDecl>(D->getDeclContext()),
881 computation);
882 if (!isExternalFormalLinkage(EnumLV.getLinkage()))
883 return LinkageInfo::none();
884 LV.merge(EnumLV);
885
886 // - a template
887 } else if (const auto *temp = dyn_cast<TemplateDecl>(D)) {
888 bool considerVisibility = !hasExplicitVisibilityAlready(computation);
889 LinkageInfo tempLV =
890 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
891 LV.mergeMaybeWithVisibility(tempLV, considerVisibility);
892
893 // An unnamed namespace or a namespace declared directly or indirectly
894 // within an unnamed namespace has internal linkage. All other namespaces
895 // have external linkage.
896 //
897 // We handled names in anonymous namespaces above.
898 } else if (isa<NamespaceDecl>(D)) {
899 return LV;
900
901 // By extension, we assign external linkage to Objective-C
902 // interfaces.
903 } else if (isa<ObjCInterfaceDecl>(D)) {
904 // fallout
905
906 } else if (auto *TD = dyn_cast<TypedefNameDecl>(D)) {
907 // A typedef declaration has linkage if it gives a type a name for
908 // linkage purposes.
909 if (!TD->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
910 return LinkageInfo::none();
911
912 } else if (isa<MSGuidDecl>(D)) {
913 // A GUID behaves like an inline variable with external linkage. Fall
914 // through.
915
916 // Everything not covered here has no linkage.
917 } else {
918 return LinkageInfo::none();
919 }
920
921 // If we ended up with non-externally-visible linkage, visibility should
922 // always be default.
923 if (!isExternallyVisible(LV.getLinkage()))
924 return LinkageInfo(LV.getLinkage(), DefaultVisibility, false);
925
926 return LV;
927}
928
929LinkageInfo
930LinkageComputer::getLVForClassMember(const NamedDecl *D,
931 LVComputationKind computation,
932 bool IgnoreVarTypeLinkage) {
933 // Only certain class members have linkage. Note that fields don't
934 // really have linkage, but it's convenient to say they do for the
935 // purposes of calculating linkage of pointer-to-data-member
936 // template arguments.
937 //
938 // Templates also don't officially have linkage, but since we ignore
939 // the C++ standard and look at template arguments when determining
940 // linkage and visibility of a template specialization, we might hit
941 // a template template argument that way. If we do, we need to
942 // consider its linkage.
943 if (!(isa<CXXMethodDecl>(D) ||
944 isa<VarDecl>(D) ||
945 isa<FieldDecl>(D) ||
946 isa<IndirectFieldDecl>(D) ||
947 isa<TagDecl>(D) ||
948 isa<TemplateDecl>(D)))
949 return LinkageInfo::none();
950
951 LinkageInfo LV;
952
953 // If we have an explicit visibility attribute, merge that in.
954 if (!hasExplicitVisibilityAlready(computation)) {
955 if (Optional<Visibility> Vis = getExplicitVisibility(D, computation))
956 LV.mergeVisibility(*Vis, true);
957 // If we're paying attention to global visibility, apply
958 // -finline-visibility-hidden if this is an inline method.
959 //
960 // Note that we do this before merging information about
961 // the class visibility.
962 if (!LV.isVisibilityExplicit() && useInlineVisibilityHidden(D))
963 LV.mergeVisibility(HiddenVisibility, /*visibilityExplicit=*/false);
964 }
965
966 // If this class member has an explicit visibility attribute, the only
967 // thing that can change its visibility is the template arguments, so
968 // only look for them when processing the class.
969 LVComputationKind classComputation = computation;
970 if (LV.isVisibilityExplicit())
971 classComputation = withExplicitVisibilityAlready(computation);
972
973 LinkageInfo classLV =
974 getLVForDecl(cast<RecordDecl>(D->getDeclContext()), classComputation);
975 // The member has the same linkage as the class. If that's not externally
976 // visible, we don't need to compute anything about the linkage.
977 // FIXME: If we're only computing linkage, can we bail out here?
978 if (!isExternallyVisible(classLV.getLinkage()))
979 return classLV;
980
981
982 // Otherwise, don't merge in classLV yet, because in certain cases
983 // we need to completely ignore the visibility from it.
984
985 // Specifically, if this decl exists and has an explicit attribute.
986 const NamedDecl *explicitSpecSuppressor = nullptr;
987
988 if (const auto *MD = dyn_cast<CXXMethodDecl>(D)) {
989 // Only look at the type-as-written. Otherwise, deducing the return type
990 // of a function could change its linkage.
991 QualType TypeAsWritten = MD->getType();
992 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
993 TypeAsWritten = TSI->getType();
994 if (!isExternallyVisible(TypeAsWritten->getLinkage()))
995 return LinkageInfo::uniqueExternal();
996
997 // If this is a method template specialization, use the linkage for
998 // the template parameters and arguments.
999 if (FunctionTemplateSpecializationInfo *spec
1000 = MD->getTemplateSpecializationInfo()) {
1001 mergeTemplateLV(LV, MD, spec, computation);
1002 if (spec->isExplicitSpecialization()) {
1003 explicitSpecSuppressor = MD;
1004 } else if (isExplicitMemberSpecialization(spec->getTemplate())) {
1005 explicitSpecSuppressor = spec->getTemplate()->getTemplatedDecl();
1006 }
1007 } else if (isExplicitMemberSpecialization(MD)) {
1008 explicitSpecSuppressor = MD;
1009 }
1010
1011 } else if (const auto *RD = dyn_cast<CXXRecordDecl>(D)) {
1012 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(RD)) {
1013 mergeTemplateLV(LV, spec, computation);
1014 if (spec->isExplicitSpecialization()) {
1015 explicitSpecSuppressor = spec;
1016 } else {
1017 const ClassTemplateDecl *temp = spec->getSpecializedTemplate();
1018 if (isExplicitMemberSpecialization(temp)) {
1019 explicitSpecSuppressor = temp->getTemplatedDecl();
1020 }
1021 }
1022 } else if (isExplicitMemberSpecialization(RD)) {
1023 explicitSpecSuppressor = RD;
1024 }
1025
1026 // Static data members.
1027 } else if (const auto *VD = dyn_cast<VarDecl>(D)) {
1028 if (const auto *spec = dyn_cast<VarTemplateSpecializationDecl>(VD))
1029 mergeTemplateLV(LV, spec, computation);
1030
1031 // Modify the variable's linkage by its type, but ignore the
1032 // type's visibility unless it's a definition.
1033 if (!IgnoreVarTypeLinkage) {
1034 LinkageInfo typeLV = getLVForType(*VD->getType(), computation);
1035 // FIXME: If the type's linkage is not externally visible, we can
1036 // give this static data member UniqueExternalLinkage.
1037 if (!LV.isVisibilityExplicit() && !classLV.isVisibilityExplicit())
1038 LV.mergeVisibility(typeLV);
1039 LV.mergeExternalVisibility(typeLV);
1040 }
1041
1042 if (isExplicitMemberSpecialization(VD)) {
1043 explicitSpecSuppressor = VD;
1044 }
1045
1046 // Template members.
1047 } else if (const auto *temp = dyn_cast<TemplateDecl>(D)) {
1048 bool considerVisibility =
1049 (!LV.isVisibilityExplicit() &&
1050 !classLV.isVisibilityExplicit() &&
1051 !hasExplicitVisibilityAlready(computation));
1052 LinkageInfo tempLV =
1053 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
1054 LV.mergeMaybeWithVisibility(tempLV, considerVisibility);
1055
1056 if (const auto *redeclTemp = dyn_cast<RedeclarableTemplateDecl>(temp)) {
1057 if (isExplicitMemberSpecialization(redeclTemp)) {
1058 explicitSpecSuppressor = temp->getTemplatedDecl();
1059 }
1060 }
1061 }
1062
1063 // We should never be looking for an attribute directly on a template.
1064 assert(!explicitSpecSuppressor || !isa<TemplateDecl>(explicitSpecSuppressor))(static_cast <bool> (!explicitSpecSuppressor || !isa<
TemplateDecl>(explicitSpecSuppressor)) ? void (0) : __assert_fail
("!explicitSpecSuppressor || !isa<TemplateDecl>(explicitSpecSuppressor)"
, "clang/lib/AST/Decl.cpp", 1064, __extension__ __PRETTY_FUNCTION__
))
;
1065
1066 // If this member is an explicit member specialization, and it has
1067 // an explicit attribute, ignore visibility from the parent.
1068 bool considerClassVisibility = true;
1069 if (explicitSpecSuppressor &&
1070 // optimization: hasDVA() is true only with explicit visibility.
1071 LV.isVisibilityExplicit() &&
1072 classLV.getVisibility() != DefaultVisibility &&
1073 hasDirectVisibilityAttribute(explicitSpecSuppressor, computation)) {
1074 considerClassVisibility = false;
1075 }
1076
1077 // Finally, merge in information from the class.
1078 LV.mergeMaybeWithVisibility(classLV, considerClassVisibility);
1079
1080 return LV;
1081}
1082
1083void NamedDecl::anchor() {}
1084
1085bool NamedDecl::isLinkageValid() const {
1086 if (!hasCachedLinkage())
1087 return true;
1088
1089 Linkage L = LinkageComputer{}
1090 .computeLVForDecl(this, LVComputationKind::forLinkageOnly())
1091 .getLinkage();
1092 return L == getCachedLinkage();
1093}
1094
1095ReservedIdentifierStatus
1096NamedDecl::isReserved(const LangOptions &LangOpts) const {
1097 const IdentifierInfo *II = getIdentifier();
1098
1099 // This triggers at least for CXXLiteralIdentifiers, which we already checked
1100 // at lexing time.
1101 if (!II)
1102 return ReservedIdentifierStatus::NotReserved;
1103
1104 ReservedIdentifierStatus Status = II->isReserved(LangOpts);
1105 if (isReservedAtGlobalScope(Status) && !isReservedInAllContexts(Status)) {
1106 // This name is only reserved at global scope. Check if this declaration
1107 // conflicts with a global scope declaration.
1108 if (isa<ParmVarDecl>(this) || isTemplateParameter())
1109 return ReservedIdentifierStatus::NotReserved;
1110
1111 // C++ [dcl.link]/7:
1112 // Two declarations [conflict] if [...] one declares a function or
1113 // variable with C language linkage, and the other declares [...] a
1114 // variable that belongs to the global scope.
1115 //
1116 // Therefore names that are reserved at global scope are also reserved as
1117 // names of variables and functions with C language linkage.
1118 const DeclContext *DC = getDeclContext()->getRedeclContext();
1119 if (DC->isTranslationUnit())
1120 return Status;
1121 if (auto *VD = dyn_cast<VarDecl>(this))
1122 if (VD->isExternC())
1123 return ReservedIdentifierStatus::StartsWithUnderscoreAndIsExternC;
1124 if (auto *FD = dyn_cast<FunctionDecl>(this))
1125 if (FD->isExternC())
1126 return ReservedIdentifierStatus::StartsWithUnderscoreAndIsExternC;
1127 return ReservedIdentifierStatus::NotReserved;
1128 }
1129
1130 return Status;
1131}
1132
1133ObjCStringFormatFamily NamedDecl::getObjCFStringFormattingFamily() const {
1134 StringRef name = getName();
1135 if (name.empty()) return SFF_None;
1136
1137 if (name.front() == 'C')
1138 if (name == "CFStringCreateWithFormat" ||
1139 name == "CFStringCreateWithFormatAndArguments" ||
1140 name == "CFStringAppendFormat" ||
1141 name == "CFStringAppendFormatAndArguments")
1142 return SFF_CFString;
1143 return SFF_None;
1144}
1145
1146Linkage NamedDecl::getLinkageInternal() const {
1147 // We don't care about visibility here, so ask for the cheapest
1148 // possible visibility analysis.
1149 return LinkageComputer{}
1150 .getLVForDecl(this, LVComputationKind::forLinkageOnly())
1151 .getLinkage();
1152}
1153
1154LinkageInfo NamedDecl::getLinkageAndVisibility() const {
1155 return LinkageComputer{}.getDeclLinkageAndVisibility(this);
1156}
1157
1158static Optional<Visibility>
1159getExplicitVisibilityAux(const NamedDecl *ND,
1160 NamedDecl::ExplicitVisibilityKind kind,
1161 bool IsMostRecent) {
1162 assert(!IsMostRecent || ND == ND->getMostRecentDecl())(static_cast <bool> (!IsMostRecent || ND == ND->getMostRecentDecl
()) ? void (0) : __assert_fail ("!IsMostRecent || ND == ND->getMostRecentDecl()"
, "clang/lib/AST/Decl.cpp", 1162, __extension__ __PRETTY_FUNCTION__
))
;
1163
1164 // Check the declaration itself first.
1165 if (Optional<Visibility> V = getVisibilityOf(ND, kind))
1166 return V;
1167
1168 // If this is a member class of a specialization of a class template
1169 // and the corresponding decl has explicit visibility, use that.
1170 if (const auto *RD = dyn_cast<CXXRecordDecl>(ND)) {
1171 CXXRecordDecl *InstantiatedFrom = RD->getInstantiatedFromMemberClass();
1172 if (InstantiatedFrom)
1173 return getVisibilityOf(InstantiatedFrom, kind);
1174 }
1175
1176 // If there wasn't explicit visibility there, and this is a
1177 // specialization of a class template, check for visibility
1178 // on the pattern.
1179 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(ND)) {
1180 // Walk all the template decl till this point to see if there are
1181 // explicit visibility attributes.
1182 const auto *TD = spec->getSpecializedTemplate()->getTemplatedDecl();
1183 while (TD != nullptr) {
1184 auto Vis = getVisibilityOf(TD, kind);
1185 if (Vis != None)
1186 return Vis;
1187 TD = TD->getPreviousDecl();
1188 }
1189 return None;
1190 }
1191
1192 // Use the most recent declaration.
1193 if (!IsMostRecent && !isa<NamespaceDecl>(ND)) {
1194 const NamedDecl *MostRecent = ND->getMostRecentDecl();
1195 if (MostRecent != ND)
1196 return getExplicitVisibilityAux(MostRecent, kind, true);
1197 }
1198
1199 if (const auto *Var = dyn_cast<VarDecl>(ND)) {
1200 if (Var->isStaticDataMember()) {
1201 VarDecl *InstantiatedFrom = Var->getInstantiatedFromStaticDataMember();
1202 if (InstantiatedFrom)
1203 return getVisibilityOf(InstantiatedFrom, kind);
1204 }
1205
1206 if (const auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(Var))
1207 return getVisibilityOf(VTSD->getSpecializedTemplate()->getTemplatedDecl(),
1208 kind);
1209
1210 return None;
1211 }
1212 // Also handle function template specializations.
1213 if (const auto *fn = dyn_cast<FunctionDecl>(ND)) {
1214 // If the function is a specialization of a template with an
1215 // explicit visibility attribute, use that.
1216 if (FunctionTemplateSpecializationInfo *templateInfo
1217 = fn->getTemplateSpecializationInfo())
1218 return getVisibilityOf(templateInfo->getTemplate()->getTemplatedDecl(),
1219 kind);
1220
1221 // If the function is a member of a specialization of a class template
1222 // and the corresponding decl has explicit visibility, use that.
1223 FunctionDecl *InstantiatedFrom = fn->getInstantiatedFromMemberFunction();
1224 if (InstantiatedFrom)
1225 return getVisibilityOf(InstantiatedFrom, kind);
1226
1227 return None;
1228 }
1229
1230 // The visibility of a template is stored in the templated decl.
1231 if (const auto *TD = dyn_cast<TemplateDecl>(ND))
1232 return getVisibilityOf(TD->getTemplatedDecl(), kind);
1233
1234 return None;
1235}
1236
1237Optional<Visibility>
1238NamedDecl::getExplicitVisibility(ExplicitVisibilityKind kind) const {
1239 return getExplicitVisibilityAux(this, kind, false);
1240}
1241
1242LinkageInfo LinkageComputer::getLVForClosure(const DeclContext *DC,
1243 Decl *ContextDecl,
1244 LVComputationKind computation) {
1245 // This lambda has its linkage/visibility determined by its owner.
1246 const NamedDecl *Owner;
1247 if (!ContextDecl)
1248 Owner = dyn_cast<NamedDecl>(DC);
1249 else if (isa<ParmVarDecl>(ContextDecl))
1250 Owner =
1251 dyn_cast<NamedDecl>(ContextDecl->getDeclContext()->getRedeclContext());
1252 else
1253 Owner = cast<NamedDecl>(ContextDecl);
1254
1255 if (!Owner)
1256 return LinkageInfo::none();
1257
1258 // If the owner has a deduced type, we need to skip querying the linkage and
1259 // visibility of that type, because it might involve this closure type. The
1260 // only effect of this is that we might give a lambda VisibleNoLinkage rather
1261 // than NoLinkage when we don't strictly need to, which is benign.
1262 auto *VD = dyn_cast<VarDecl>(Owner);
1263 LinkageInfo OwnerLV =
1264 VD && VD->getType()->getContainedDeducedType()
1265 ? computeLVForDecl(Owner, computation, /*IgnoreVarTypeLinkage*/true)
1266 : getLVForDecl(Owner, computation);
1267
1268 // A lambda never formally has linkage. But if the owner is externally
1269 // visible, then the lambda is too. We apply the same rules to blocks.
1270 if (!isExternallyVisible(OwnerLV.getLinkage()))
1271 return LinkageInfo::none();
1272 return LinkageInfo(VisibleNoLinkage, OwnerLV.getVisibility(),
1273 OwnerLV.isVisibilityExplicit());
1274}
1275
1276LinkageInfo LinkageComputer::getLVForLocalDecl(const NamedDecl *D,
1277 LVComputationKind computation) {
1278 if (const auto *Function = dyn_cast<FunctionDecl>(D)) {
1279 if (Function->isInAnonymousNamespace() &&
1280 !isFirstInExternCContext(Function))
1281 return getInternalLinkageFor(Function);
1282
1283 // This is a "void f();" which got merged with a file static.
1284 if (Function->getCanonicalDecl()->getStorageClass() == SC_Static)
1285 return getInternalLinkageFor(Function);
1286
1287 LinkageInfo LV;
1288 if (!hasExplicitVisibilityAlready(computation)) {
1289 if (Optional<Visibility> Vis =
1290 getExplicitVisibility(Function, computation))
1291 LV.mergeVisibility(*Vis, true);
1292 }
1293
1294 // Note that Sema::MergeCompatibleFunctionDecls already takes care of
1295 // merging storage classes and visibility attributes, so we don't have to
1296 // look at previous decls in here.
1297
1298 return LV;
1299 }
1300
1301 if (const auto *Var = dyn_cast<VarDecl>(D)) {
1302 if (Var->hasExternalStorage()) {
1303 if (Var->isInAnonymousNamespace() && !isFirstInExternCContext(Var))
1304 return getInternalLinkageFor(Var);
1305
1306 LinkageInfo LV;
1307 if (Var->getStorageClass() == SC_PrivateExtern)
1308 LV.mergeVisibility(HiddenVisibility, true);
1309 else if (!hasExplicitVisibilityAlready(computation)) {
1310 if (Optional<Visibility> Vis = getExplicitVisibility(Var, computation))
1311 LV.mergeVisibility(*Vis, true);
1312 }
1313
1314 if (const VarDecl *Prev = Var->getPreviousDecl()) {
1315 LinkageInfo PrevLV = getLVForDecl(Prev, computation);
1316 if (PrevLV.getLinkage())
1317 LV.setLinkage(PrevLV.getLinkage());
1318 LV.mergeVisibility(PrevLV);
1319 }
1320
1321 return LV;
1322 }
1323
1324 if (!Var->isStaticLocal())
1325 return LinkageInfo::none();
1326 }
1327
1328 ASTContext &Context = D->getASTContext();
1329 if (!Context.getLangOpts().CPlusPlus)
1330 return LinkageInfo::none();
1331
1332 const Decl *OuterD = getOutermostFuncOrBlockContext(D);
1333 if (!OuterD || OuterD->isInvalidDecl())
1334 return LinkageInfo::none();
1335
1336 LinkageInfo LV;
1337 if (const auto *BD = dyn_cast<BlockDecl>(OuterD)) {
1338 if (!BD->getBlockManglingNumber())
1339 return LinkageInfo::none();
1340
1341 LV = getLVForClosure(BD->getDeclContext()->getRedeclContext(),
1342 BD->getBlockManglingContextDecl(), computation);
1343 } else {
1344 const auto *FD = cast<FunctionDecl>(OuterD);
1345 if (!FD->isInlined() &&
1346 !isTemplateInstantiation(FD->getTemplateSpecializationKind()))
1347 return LinkageInfo::none();
1348
1349 // If a function is hidden by -fvisibility-inlines-hidden option and
1350 // is not explicitly attributed as a hidden function,
1351 // we should not make static local variables in the function hidden.
1352 LV = getLVForDecl(FD, computation);
1353 if (isa<VarDecl>(D) && useInlineVisibilityHidden(FD) &&
1354 !LV.isVisibilityExplicit() &&
1355 !Context.getLangOpts().VisibilityInlinesHiddenStaticLocalVar) {
1356 assert(cast<VarDecl>(D)->isStaticLocal())(static_cast <bool> (cast<VarDecl>(D)->isStaticLocal
()) ? void (0) : __assert_fail ("cast<VarDecl>(D)->isStaticLocal()"
, "clang/lib/AST/Decl.cpp", 1356, __extension__ __PRETTY_FUNCTION__
))
;
1357 // If this was an implicitly hidden inline method, check again for
1358 // explicit visibility on the parent class, and use that for static locals
1359 // if present.
1360 if (const auto *MD = dyn_cast<CXXMethodDecl>(FD))
1361 LV = getLVForDecl(MD->getParent(), computation);
1362 if (!LV.isVisibilityExplicit()) {
1363 Visibility globalVisibility =
1364 computation.isValueVisibility()
1365 ? Context.getLangOpts().getValueVisibilityMode()
1366 : Context.getLangOpts().getTypeVisibilityMode();
1367 return LinkageInfo(VisibleNoLinkage, globalVisibility,
1368 /*visibilityExplicit=*/false);
1369 }
1370 }
1371 }
1372 if (!isExternallyVisible(LV.getLinkage()))
1373 return LinkageInfo::none();
1374 return LinkageInfo(VisibleNoLinkage, LV.getVisibility(),
1375 LV.isVisibilityExplicit());
1376}
1377
1378LinkageInfo LinkageComputer::computeLVForDecl(const NamedDecl *D,
1379 LVComputationKind computation,
1380 bool IgnoreVarTypeLinkage) {
1381 // Internal_linkage attribute overrides other considerations.
1382 if (D->hasAttr<InternalLinkageAttr>())
1383 return getInternalLinkageFor(D);
1384
1385 // Objective-C: treat all Objective-C declarations as having external
1386 // linkage.
1387 switch (D->getKind()) {
1388 default:
1389 break;
1390
1391 // Per C++ [basic.link]p2, only the names of objects, references,
1392 // functions, types, templates, namespaces, and values ever have linkage.
1393 //
1394 // Note that the name of a typedef, namespace alias, using declaration,
1395 // and so on are not the name of the corresponding type, namespace, or
1396 // declaration, so they do *not* have linkage.
1397 case Decl::ImplicitParam:
1398 case Decl::Label:
1399 case Decl::NamespaceAlias:
1400 case Decl::ParmVar:
1401 case Decl::Using:
1402 case Decl::UsingEnum:
1403 case Decl::UsingShadow:
1404 case Decl::UsingDirective:
1405 return LinkageInfo::none();
1406
1407 case Decl::EnumConstant:
1408 // C++ [basic.link]p4: an enumerator has the linkage of its enumeration.
1409 if (D->getASTContext().getLangOpts().CPlusPlus)
1410 return getLVForDecl(cast<EnumDecl>(D->getDeclContext()), computation);
1411 return LinkageInfo::visible_none();
1412
1413 case Decl::Typedef:
1414 case Decl::TypeAlias:
1415 // A typedef declaration has linkage if it gives a type a name for
1416 // linkage purposes.
1417 if (!cast<TypedefNameDecl>(D)
1418 ->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
1419 return LinkageInfo::none();
1420 break;
1421
1422 case Decl::TemplateTemplateParm: // count these as external
1423 case Decl::NonTypeTemplateParm:
1424 case Decl::ObjCAtDefsField:
1425 case Decl::ObjCCategory:
1426 case Decl::ObjCCategoryImpl:
1427 case Decl::ObjCCompatibleAlias:
1428 case Decl::ObjCImplementation:
1429 case Decl::ObjCMethod:
1430 case Decl::ObjCProperty:
1431 case Decl::ObjCPropertyImpl:
1432 case Decl::ObjCProtocol:
1433 return getExternalLinkageFor(D);
1434
1435 case Decl::CXXRecord: {
1436 const auto *Record = cast<CXXRecordDecl>(D);
1437 if (Record->isLambda()) {
1438 if (Record->hasKnownLambdaInternalLinkage() ||
1439 !Record->getLambdaManglingNumber()) {
1440 // This lambda has no mangling number, so it's internal.
1441 return getInternalLinkageFor(D);
1442 }
1443
1444 return getLVForClosure(
1445 Record->getDeclContext()->getRedeclContext(),
1446 Record->getLambdaContextDecl(), computation);
1447 }
1448
1449 break;
1450 }
1451
1452 case Decl::TemplateParamObject: {
1453 // The template parameter object can be referenced from anywhere its type
1454 // and value can be referenced.
1455 auto *TPO = cast<TemplateParamObjectDecl>(D);
1456 LinkageInfo LV = getLVForType(*TPO->getType(), computation);
1457 LV.merge(getLVForValue(TPO->getValue(), computation));
1458 return LV;
1459 }
1460 }
1461
1462 // Handle linkage for namespace-scope names.
1463 if (D->getDeclContext()->getRedeclContext()->isFileContext())
1464 return getLVForNamespaceScopeDecl(D, computation, IgnoreVarTypeLinkage);
1465
1466 // C++ [basic.link]p5:
1467 // In addition, a member function, static data member, a named
1468 // class or enumeration of class scope, or an unnamed class or
1469 // enumeration defined in a class-scope typedef declaration such
1470 // that the class or enumeration has the typedef name for linkage
1471 // purposes (7.1.3), has external linkage if the name of the class
1472 // has external linkage.
1473 if (D->getDeclContext()->isRecord())
1474 return getLVForClassMember(D, computation, IgnoreVarTypeLinkage);
1475
1476 // C++ [basic.link]p6:
1477 // The name of a function declared in block scope and the name of
1478 // an object declared by a block scope extern declaration have
1479 // linkage. If there is a visible declaration of an entity with
1480 // linkage having the same name and type, ignoring entities
1481 // declared outside the innermost enclosing namespace scope, the
1482 // block scope declaration declares that same entity and receives
1483 // the linkage of the previous declaration. If there is more than
1484 // one such matching entity, the program is ill-formed. Otherwise,
1485 // if no matching entity is found, the block scope entity receives
1486 // external linkage.
1487 if (D->getDeclContext()->isFunctionOrMethod())
1488 return getLVForLocalDecl(D, computation);
1489
1490 // C++ [basic.link]p6:
1491 // Names not covered by these rules have no linkage.
1492 return LinkageInfo::none();
1493}
1494
1495/// getLVForDecl - Get the linkage and visibility for the given declaration.
1496LinkageInfo LinkageComputer::getLVForDecl(const NamedDecl *D,
1497 LVComputationKind computation) {
1498 // Internal_linkage attribute overrides other considerations.
1499 if (D->hasAttr<InternalLinkageAttr>())
1500 return getInternalLinkageFor(D);
1501
1502 if (computation.IgnoreAllVisibility && D->hasCachedLinkage())
1503 return LinkageInfo(D->getCachedLinkage(), DefaultVisibility, false);
1504
1505 if (llvm::Optional<LinkageInfo> LI = lookup(D, computation))
1506 return *LI;
1507
1508 LinkageInfo LV = computeLVForDecl(D, computation);
1509 if (D->hasCachedLinkage())
1510 assert(D->getCachedLinkage() == LV.getLinkage())(static_cast <bool> (D->getCachedLinkage() == LV.getLinkage
()) ? void (0) : __assert_fail ("D->getCachedLinkage() == LV.getLinkage()"
, "clang/lib/AST/Decl.cpp", 1510, __extension__ __PRETTY_FUNCTION__
))
;
1511
1512 D->setCachedLinkage(LV.getLinkage());
1513 cache(D, computation, LV);
1514
1515#ifndef NDEBUG
1516 // In C (because of gnu inline) and in c++ with microsoft extensions an
1517 // static can follow an extern, so we can have two decls with different
1518 // linkages.
1519 const LangOptions &Opts = D->getASTContext().getLangOpts();
1520 if (!Opts.CPlusPlus || Opts.MicrosoftExt)
1521 return LV;
1522
1523 // We have just computed the linkage for this decl. By induction we know
1524 // that all other computed linkages match, check that the one we just
1525 // computed also does.
1526 NamedDecl *Old = nullptr;
1527 for (auto I : D->redecls()) {
1528 auto *T = cast<NamedDecl>(I);
1529 if (T == D)
1530 continue;
1531 if (!T->isInvalidDecl() && T->hasCachedLinkage()) {
1532 Old = T;
1533 break;
1534 }
1535 }
1536 assert(!Old || Old->getCachedLinkage() == D->getCachedLinkage())(static_cast <bool> (!Old || Old->getCachedLinkage()
== D->getCachedLinkage()) ? void (0) : __assert_fail ("!Old || Old->getCachedLinkage() == D->getCachedLinkage()"
, "clang/lib/AST/Decl.cpp", 1536, __extension__ __PRETTY_FUNCTION__
))
;
1537#endif
1538
1539 return LV;
1540}
1541
1542LinkageInfo LinkageComputer::getDeclLinkageAndVisibility(const NamedDecl *D) {
1543 NamedDecl::ExplicitVisibilityKind EK = usesTypeVisibility(D)
1544 ? NamedDecl::VisibilityForType
1545 : NamedDecl::VisibilityForValue;
1546 LVComputationKind CK(EK);
1547 return getLVForDecl(D, D->getASTContext().getLangOpts().IgnoreXCOFFVisibility
1548 ? CK.forLinkageOnly()
1549 : CK);
1550}
1551
1552Module *Decl::getOwningModuleForLinkage(bool IgnoreLinkage) const {
1553 if (isa<NamespaceDecl>(this))
1554 // Namespaces never have module linkage. It is the entities within them
1555 // that [may] do.
1556 return nullptr;
1557
1558 Module *M = getOwningModule();
1559 if (!M)
1560 return nullptr;
1561
1562 switch (M->Kind) {
1563 case Module::ModuleMapModule:
1564 // Module map modules have no special linkage semantics.
1565 return nullptr;
1566
1567 case Module::ModuleInterfaceUnit:
1568 case Module::ModulePartitionInterface:
1569 case Module::ModulePartitionImplementation:
1570 return M;
1571
1572 case Module::ModuleHeaderUnit:
1573 case Module::GlobalModuleFragment: {
1574 // External linkage declarations in the global module have no owning module
1575 // for linkage purposes. But internal linkage declarations in the global
1576 // module fragment of a particular module are owned by that module for
1577 // linkage purposes.
1578 // FIXME: p1815 removes the need for this distinction -- there are no
1579 // internal linkage declarations that need to be referred to from outside
1580 // this TU.
1581 if (IgnoreLinkage)
1582 return nullptr;
1583 bool InternalLinkage;
1584 if (auto *ND = dyn_cast<NamedDecl>(this))
1585 InternalLinkage = !ND->hasExternalFormalLinkage();
1586 else
1587 InternalLinkage = isInAnonymousNamespace();
1588 return InternalLinkage ? M->Kind == Module::ModuleHeaderUnit ? M : M->Parent
1589 : nullptr;
1590 }
1591
1592 case Module::PrivateModuleFragment:
1593 // The private module fragment is part of its containing module for linkage
1594 // purposes.
1595 return M->Parent;
1596 }
1597
1598 llvm_unreachable("unknown module kind")::llvm::llvm_unreachable_internal("unknown module kind", "clang/lib/AST/Decl.cpp"
, 1598)
;
1599}
1600
1601void NamedDecl::printName(raw_ostream &os) const {
1602 os << Name;
1603}
1604
1605std::string NamedDecl::getQualifiedNameAsString() const {
1606 std::string QualName;
1607 llvm::raw_string_ostream OS(QualName);
1608 printQualifiedName(OS, getASTContext().getPrintingPolicy());
1609 return QualName;
1610}
1611
1612void NamedDecl::printQualifiedName(raw_ostream &OS) const {
1613 printQualifiedName(OS, getASTContext().getPrintingPolicy());
1614}
1615
1616void NamedDecl::printQualifiedName(raw_ostream &OS,
1617 const PrintingPolicy &P) const {
1618 if (getDeclContext()->isFunctionOrMethod()) {
1619 // We do not print '(anonymous)' for function parameters without name.
1620 printName(OS);
1621 return;
1622 }
1623 printNestedNameSpecifier(OS, P);
1624 if (getDeclName())
1625 OS << *this;
1626 else {
1627 // Give the printName override a chance to pick a different name before we
1628 // fall back to "(anonymous)".
1629 SmallString<64> NameBuffer;
1630 llvm::raw_svector_ostream NameOS(NameBuffer);
1631 printName(NameOS);
1632 if (NameBuffer.empty())
1633 OS << "(anonymous)";
1634 else
1635 OS << NameBuffer;
1636 }
1637}
1638
1639void NamedDecl::printNestedNameSpecifier(raw_ostream &OS) const {
1640 printNestedNameSpecifier(OS, getASTContext().getPrintingPolicy());
1641}
1642
1643void NamedDecl::printNestedNameSpecifier(raw_ostream &OS,
1644 const PrintingPolicy &P) const {
1645 const DeclContext *Ctx = getDeclContext();
1646
1647 // For ObjC methods and properties, look through categories and use the
1648 // interface as context.
1649 if (auto *MD = dyn_cast<ObjCMethodDecl>(this)) {
1650 if (auto *ID = MD->getClassInterface())
1651 Ctx = ID;
1652 } else if (auto *PD = dyn_cast<ObjCPropertyDecl>(this)) {
1653 if (auto *MD = PD->getGetterMethodDecl())
1654 if (auto *ID = MD->getClassInterface())
1655 Ctx = ID;
1656 } else if (auto *ID = dyn_cast<ObjCIvarDecl>(this)) {
1657 if (auto *CI = ID->getContainingInterface())
1658 Ctx = CI;
1659 }
1660
1661 if (Ctx->isFunctionOrMethod())
1662 return;
1663
1664 using ContextsTy = SmallVector<const DeclContext *, 8>;
1665 ContextsTy Contexts;
1666
1667 // Collect named contexts.
1668 DeclarationName NameInScope = getDeclName();
1669 for (; Ctx; Ctx = Ctx->getParent()) {
1670 // Suppress anonymous namespace if requested.
1671 if (P.SuppressUnwrittenScope && isa<NamespaceDecl>(Ctx) &&
1672 cast<NamespaceDecl>(Ctx)->isAnonymousNamespace())
1673 continue;
1674
1675 // Suppress inline namespace if it doesn't make the result ambiguous.
1676 if (P.SuppressInlineNamespace && Ctx->isInlineNamespace() && NameInScope &&
1677 cast<NamespaceDecl>(Ctx)->isRedundantInlineQualifierFor(NameInScope))
1678 continue;
1679
1680 // Skip non-named contexts such as linkage specifications and ExportDecls.
1681 const NamedDecl *ND = dyn_cast<NamedDecl>(Ctx);
1682 if (!ND)
1683 continue;
1684
1685 Contexts.push_back(Ctx);
1686 NameInScope = ND->getDeclName();
1687 }
1688
1689 for (const DeclContext *DC : llvm::reverse(Contexts)) {
1690 if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(DC)) {
1691 OS << Spec->getName();
1692 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
1693 printTemplateArgumentList(
1694 OS, TemplateArgs.asArray(), P,
1695 Spec->getSpecializedTemplate()->getTemplateParameters());
1696 } else if (const auto *ND = dyn_cast<NamespaceDecl>(DC)) {
1697 if (ND->isAnonymousNamespace()) {
1698 OS << (P.MSVCFormatting ? "`anonymous namespace\'"
1699 : "(anonymous namespace)");
1700 }
1701 else
1702 OS << *ND;
1703 } else if (const auto *RD = dyn_cast<RecordDecl>(DC)) {
1704 if (!RD->getIdentifier())
1705 OS << "(anonymous " << RD->getKindName() << ')';
1706 else
1707 OS << *RD;
1708 } else if (const auto *FD = dyn_cast<FunctionDecl>(DC)) {
1709 const FunctionProtoType *FT = nullptr;
1710 if (FD->hasWrittenPrototype())
1711 FT = dyn_cast<FunctionProtoType>(FD->getType()->castAs<FunctionType>());
1712
1713 OS << *FD << '(';
1714 if (FT) {
1715 unsigned NumParams = FD->getNumParams();
1716 for (unsigned i = 0; i < NumParams; ++i) {
1717 if (i)
1718 OS << ", ";
1719 OS << FD->getParamDecl(i)->getType().stream(P);
1720 }
1721
1722 if (FT->isVariadic()) {
1723 if (NumParams > 0)
1724 OS << ", ";
1725 OS << "...";
1726 }
1727 }
1728 OS << ')';
1729 } else if (const auto *ED = dyn_cast<EnumDecl>(DC)) {
1730 // C++ [dcl.enum]p10: Each enum-name and each unscoped
1731 // enumerator is declared in the scope that immediately contains
1732 // the enum-specifier. Each scoped enumerator is declared in the
1733 // scope of the enumeration.
1734 // For the case of unscoped enumerator, do not include in the qualified
1735 // name any information about its enum enclosing scope, as its visibility
1736 // is global.
1737 if (ED->isScoped())
1738 OS << *ED;
1739 else
1740 continue;
1741 } else {
1742 OS << *cast<NamedDecl>(DC);
1743 }
1744 OS << "::";
1745 }
1746}
1747
1748void NamedDecl::getNameForDiagnostic(raw_ostream &OS,
1749 const PrintingPolicy &Policy,
1750 bool Qualified) const {
1751 if (Qualified)
1752 printQualifiedName(OS, Policy);
1753 else
1754 printName(OS);
1755}
1756
1757template<typename T> static bool isRedeclarableImpl(Redeclarable<T> *) {
1758 return true;
1759}
1760static bool isRedeclarableImpl(...) { return false; }
1761static bool isRedeclarable(Decl::Kind K) {
1762 switch (K) {
1763#define DECL(Type, Base) \
1764 case Decl::Type: \
1765 return isRedeclarableImpl((Type##Decl *)nullptr);
1766#define ABSTRACT_DECL(DECL)
1767#include "clang/AST/DeclNodes.inc"
1768 }
1769 llvm_unreachable("unknown decl kind")::llvm::llvm_unreachable_internal("unknown decl kind", "clang/lib/AST/Decl.cpp"
, 1769)
;
1770}
1771
1772bool NamedDecl::declarationReplaces(NamedDecl *OldD, bool IsKnownNewer) const {
1773 assert(getDeclName() == OldD->getDeclName() && "Declaration name mismatch")(static_cast <bool> (getDeclName() == OldD->getDeclName
() && "Declaration name mismatch") ? void (0) : __assert_fail
("getDeclName() == OldD->getDeclName() && \"Declaration name mismatch\""
, "clang/lib/AST/Decl.cpp", 1773, __extension__ __PRETTY_FUNCTION__
))
;
1774
1775 // Never replace one imported declaration with another; we need both results
1776 // when re-exporting.
1777 if (OldD->isFromASTFile() && isFromASTFile())
1778 return false;
1779
1780 // A kind mismatch implies that the declaration is not replaced.
1781 if (OldD->getKind() != getKind())
1782 return false;
1783
1784 // For method declarations, we never replace. (Why?)
1785 if (isa<ObjCMethodDecl>(this))
1786 return false;
1787
1788 // For parameters, pick the newer one. This is either an error or (in
1789 // Objective-C) permitted as an extension.
1790 if (isa<ParmVarDecl>(this))
1791 return true;
1792
1793 // Inline namespaces can give us two declarations with the same
1794 // name and kind in the same scope but different contexts; we should
1795 // keep both declarations in this case.
1796 if (!this->getDeclContext()->getRedeclContext()->Equals(
1797 OldD->getDeclContext()->getRedeclContext()))
1798 return false;
1799
1800 // Using declarations can be replaced if they import the same name from the
1801 // same context.
1802 if (auto *UD = dyn_cast<UsingDecl>(this)) {
1803 ASTContext &Context = getASTContext();
1804 return Context.getCanonicalNestedNameSpecifier(UD->getQualifier()) ==
1805 Context.getCanonicalNestedNameSpecifier(
1806 cast<UsingDecl>(OldD)->getQualifier());
1807 }
1808 if (auto *UUVD = dyn_cast<UnresolvedUsingValueDecl>(this)) {
1809 ASTContext &Context = getASTContext();
1810 return Context.getCanonicalNestedNameSpecifier(UUVD->getQualifier()) ==
1811 Context.getCanonicalNestedNameSpecifier(
1812 cast<UnresolvedUsingValueDecl>(OldD)->getQualifier());
1813 }
1814
1815 if (isRedeclarable(getKind())) {
1816 if (getCanonicalDecl() != OldD->getCanonicalDecl())
1817 return false;
1818
1819 if (IsKnownNewer)
1820 return true;
1821
1822 // Check whether this is actually newer than OldD. We want to keep the
1823 // newer declaration. This loop will usually only iterate once, because
1824 // OldD is usually the previous declaration.
1825 for (auto D : redecls()) {
1826 if (D == OldD)
1827 break;
1828
1829 // If we reach the canonical declaration, then OldD is not actually older
1830 // than this one.
1831 //
1832 // FIXME: In this case, we should not add this decl to the lookup table.
1833 if (D->isCanonicalDecl())
1834 return false;
1835 }
1836
1837 // It's a newer declaration of the same kind of declaration in the same
1838 // scope: we want this decl instead of the existing one.
1839 return true;
1840 }
1841
1842 // In all other cases, we need to keep both declarations in case they have
1843 // different visibility. Any attempt to use the name will result in an
1844 // ambiguity if more than one is visible.
1845 return false;
1846}
1847
1848bool NamedDecl::hasLinkage() const {
1849 return getFormalLinkage() != NoLinkage;
1850}
1851
1852NamedDecl *NamedDecl::getUnderlyingDeclImpl() {
1853 NamedDecl *ND = this;
1854 while (auto *UD = dyn_cast<UsingShadowDecl>(ND))
1855 ND = UD->getTargetDecl();
1856
1857 if (auto *AD = dyn_cast<ObjCCompatibleAliasDecl>(ND))
1858 return AD->getClassInterface();
1859
1860 if (auto *AD = dyn_cast<NamespaceAliasDecl>(ND))
1861 return AD->getNamespace();
1862
1863 return ND;
1864}
1865
1866bool NamedDecl::isCXXInstanceMember() const {
1867 if (!isCXXClassMember())
1868 return false;
1869
1870 const NamedDecl *D = this;
1871 if (isa<UsingShadowDecl>(D))
1872 D = cast<UsingShadowDecl>(D)->getTargetDecl();
1873
1874 if (isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D) || isa<MSPropertyDecl>(D))
1875 return true;
1876 if (const auto *MD = dyn_cast_or_null<CXXMethodDecl>(D->getAsFunction()))
1877 return MD->isInstance();
1878 return false;
1879}
1880
1881//===----------------------------------------------------------------------===//
1882// DeclaratorDecl Implementation
1883//===----------------------------------------------------------------------===//
1884
1885template <typename DeclT>
1886static SourceLocation getTemplateOrInnerLocStart(const DeclT *decl) {
1887 if (decl->getNumTemplateParameterLists() > 0)
1888 return decl->getTemplateParameterList(0)->getTemplateLoc();
1889 return decl->getInnerLocStart();
1890}
1891
1892SourceLocation DeclaratorDecl::getTypeSpecStartLoc() const {
1893 TypeSourceInfo *TSI = getTypeSourceInfo();
1894 if (TSI) return TSI->getTypeLoc().getBeginLoc();
1895 return SourceLocation();
1896}
1897
1898SourceLocation DeclaratorDecl::getTypeSpecEndLoc() const {
1899 TypeSourceInfo *TSI = getTypeSourceInfo();
1900 if (TSI) return TSI->getTypeLoc().getEndLoc();
1901 return SourceLocation();
1902}
1903
1904void DeclaratorDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
1905 if (QualifierLoc) {
1906 // Make sure the extended decl info is allocated.
1907 if (!hasExtInfo()) {
1908 // Save (non-extended) type source info pointer.
1909 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1910 // Allocate external info struct.
1911 DeclInfo = new (getASTContext()) ExtInfo;
1912 // Restore savedTInfo into (extended) decl info.
1913 getExtInfo()->TInfo = savedTInfo;
1914 }
1915 // Set qualifier info.
1916 getExtInfo()->QualifierLoc = QualifierLoc;
1917 } else if (hasExtInfo()) {
1918 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
1919 getExtInfo()->QualifierLoc = QualifierLoc;
1920 }
1921}
1922
1923void DeclaratorDecl::setTrailingRequiresClause(Expr *TrailingRequiresClause) {
1924 assert(TrailingRequiresClause)(static_cast <bool> (TrailingRequiresClause) ? void (0)
: __assert_fail ("TrailingRequiresClause", "clang/lib/AST/Decl.cpp"
, 1924, __extension__ __PRETTY_FUNCTION__))
;
1925 // Make sure the extended decl info is allocated.
1926 if (!hasExtInfo()) {
1927 // Save (non-extended) type source info pointer.
1928 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1929 // Allocate external info struct.
1930 DeclInfo = new (getASTContext()) ExtInfo;
1931 // Restore savedTInfo into (extended) decl info.
1932 getExtInfo()->TInfo = savedTInfo;
1933 }
1934 // Set requires clause info.
1935 getExtInfo()->TrailingRequiresClause = TrailingRequiresClause;
1936}
1937
1938void DeclaratorDecl::setTemplateParameterListsInfo(
1939 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
1940 assert(!TPLists.empty())(static_cast <bool> (!TPLists.empty()) ? void (0) : __assert_fail
("!TPLists.empty()", "clang/lib/AST/Decl.cpp", 1940, __extension__
__PRETTY_FUNCTION__))
;
1941 // Make sure the extended decl info is allocated.
1942 if (!hasExtInfo()) {
1943 // Save (non-extended) type source info pointer.
1944 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1945 // Allocate external info struct.
1946 DeclInfo = new (getASTContext()) ExtInfo;
1947 // Restore savedTInfo into (extended) decl info.
1948 getExtInfo()->TInfo = savedTInfo;
1949 }
1950 // Set the template parameter lists info.
1951 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
1952}
1953
1954SourceLocation DeclaratorDecl::getOuterLocStart() const {
1955 return getTemplateOrInnerLocStart(this);
1956}
1957
1958// Helper function: returns true if QT is or contains a type
1959// having a postfix component.
1960static bool typeIsPostfix(QualType QT) {
1961 while (true) {
1962 const Type* T = QT.getTypePtr();
1963 switch (T->getTypeClass()) {
1964 default:
1965 return false;
1966 case Type::Pointer:
1967 QT = cast<PointerType>(T)->getPointeeType();
1968 break;
1969 case Type::BlockPointer:
1970 QT = cast<BlockPointerType>(T)->getPointeeType();
1971 break;
1972 case Type::MemberPointer:
1973 QT = cast<MemberPointerType>(T)->getPointeeType();
1974 break;
1975 case Type::LValueReference:
1976 case Type::RValueReference:
1977 QT = cast<ReferenceType>(T)->getPointeeType();
1978 break;
1979 case Type::PackExpansion:
1980 QT = cast<PackExpansionType>(T)->getPattern();
1981 break;
1982 case Type::Paren:
1983 case Type::ConstantArray:
1984 case Type::DependentSizedArray:
1985 case Type::IncompleteArray:
1986 case Type::VariableArray:
1987 case Type::FunctionProto:
1988 case Type::FunctionNoProto:
1989 return true;
1990 }
1991 }
1992}
1993
1994SourceRange DeclaratorDecl::getSourceRange() const {
1995 SourceLocation RangeEnd = getLocation();
1996 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
1997 // If the declaration has no name or the type extends past the name take the
1998 // end location of the type.
1999 if (!getDeclName() || typeIsPostfix(TInfo->getType()))
2000 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
2001 }
2002 return SourceRange(getOuterLocStart(), RangeEnd);
2003}
2004
2005void QualifierInfo::setTemplateParameterListsInfo(
2006 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
2007 // Free previous template parameters (if any).
2008 if (NumTemplParamLists > 0) {
2009 Context.Deallocate(TemplParamLists);
2010 TemplParamLists = nullptr;
2011 NumTemplParamLists = 0;
2012 }
2013 // Set info on matched template parameter lists (if any).
2014 if (!TPLists.empty()) {
2015 TemplParamLists = new (Context) TemplateParameterList *[TPLists.size()];
2016 NumTemplParamLists = TPLists.size();
2017 std::copy(TPLists.begin(), TPLists.end(), TemplParamLists);
2018 }
2019}
2020
2021//===----------------------------------------------------------------------===//
2022// VarDecl Implementation
2023//===----------------------------------------------------------------------===//
2024
2025const char *VarDecl::getStorageClassSpecifierString(StorageClass SC) {
2026 switch (SC) {
2027 case SC_None: break;
2028 case SC_Auto: return "auto";
2029 case SC_Extern: return "extern";
2030 case SC_PrivateExtern: return "__private_extern__";
2031 case SC_Register: return "register";
2032 case SC_Static: return "static";
2033 }
2034
2035 llvm_unreachable("Invalid storage class")::llvm::llvm_unreachable_internal("Invalid storage class", "clang/lib/AST/Decl.cpp"
, 2035)
;
2036}
2037
2038VarDecl::VarDecl(Kind DK, ASTContext &C, DeclContext *DC,
2039 SourceLocation StartLoc, SourceLocation IdLoc,
2040 const IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
2041 StorageClass SC)
2042 : DeclaratorDecl(DK, DC, IdLoc, Id, T, TInfo, StartLoc),
2043 redeclarable_base(C) {
2044 static_assert(sizeof(VarDeclBitfields) <= sizeof(unsigned),
2045 "VarDeclBitfields too large!");
2046 static_assert(sizeof(ParmVarDeclBitfields) <= sizeof(unsigned),
2047 "ParmVarDeclBitfields too large!");
2048 static_assert(sizeof(NonParmVarDeclBitfields) <= sizeof(unsigned),
2049 "NonParmVarDeclBitfields too large!");
2050 AllBits = 0;
2051 VarDeclBits.SClass = SC;
2052 // Everything else is implicitly initialized to false.
2053}
2054
2055VarDecl *VarDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation StartL,
2056 SourceLocation IdL, const IdentifierInfo *Id,
2057 QualType T, TypeSourceInfo *TInfo, StorageClass S) {
2058 return new (C, DC) VarDecl(Var, C, DC, StartL, IdL, Id, T, TInfo, S);
2059}
2060
2061VarDecl *VarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
2062 return new (C, ID)
2063 VarDecl(Var, C, nullptr, SourceLocation(), SourceLocation(), nullptr,
2064 QualType(), nullptr, SC_None);
2065}
2066
2067void VarDecl::setStorageClass(StorageClass SC) {
2068 assert(isLegalForVariable(SC))(static_cast <bool> (isLegalForVariable(SC)) ? void (0)
: __assert_fail ("isLegalForVariable(SC)", "clang/lib/AST/Decl.cpp"
, 2068, __extension__ __PRETTY_FUNCTION__))
;
2069 VarDeclBits.SClass = SC;
2070}
2071
2072VarDecl::TLSKind VarDecl::getTLSKind() const {
2073 switch (VarDeclBits.TSCSpec) {
2074 case TSCS_unspecified:
2075 if (!hasAttr<ThreadAttr>() &&
2076 !(getASTContext().getLangOpts().OpenMPUseTLS &&
2077 getASTContext().getTargetInfo().isTLSSupported() &&
2078 hasAttr<OMPThreadPrivateDeclAttr>()))
2079 return TLS_None;
2080 return ((getASTContext().getLangOpts().isCompatibleWithMSVC(
2081 LangOptions::MSVC2015)) ||
2082 hasAttr<OMPThreadPrivateDeclAttr>())
2083 ? TLS_Dynamic
2084 : TLS_Static;
2085 case TSCS___thread: // Fall through.
2086 case TSCS__Thread_local:
2087 return TLS_Static;
2088 case TSCS_thread_local:
2089 return TLS_Dynamic;
2090 }
2091 llvm_unreachable("Unknown thread storage class specifier!")::llvm::llvm_unreachable_internal("Unknown thread storage class specifier!"
, "clang/lib/AST/Decl.cpp", 2091)
;
2092}
2093
2094SourceRange VarDecl::getSourceRange() const {
2095 if (const Expr *Init = getInit()) {
2096 SourceLocation InitEnd = Init->getEndLoc();
2097 // If Init is implicit, ignore its source range and fallback on
2098 // DeclaratorDecl::getSourceRange() to handle postfix elements.
2099 if (InitEnd.isValid() && InitEnd != getLocation())
2100 return SourceRange(getOuterLocStart(), InitEnd);
2101 }
2102 return DeclaratorDecl::getSourceRange();
2103}
2104
2105template<typename T>
2106static LanguageLinkage getDeclLanguageLinkage(const T &D) {
2107 // C++ [dcl.link]p1: All function types, function names with external linkage,
2108 // and variable names with external linkage have a language linkage.
2109 if (!D.hasExternalFormalLinkage())
2110 return NoLanguageLinkage;
2111
2112 // Language linkage is a C++ concept, but saying that everything else in C has
2113 // C language linkage fits the implementation nicely.
2114 ASTContext &Context = D.getASTContext();
2115 if (!Context.getLangOpts().CPlusPlus)
2116 return CLanguageLinkage;
2117
2118 // C++ [dcl.link]p4: A C language linkage is ignored in determining the
2119 // language linkage of the names of class members and the function type of
2120 // class member functions.
2121 const DeclContext *DC = D.getDeclContext();
2122 if (DC->isRecord())
2123 return CXXLanguageLinkage;
2124
2125 // If the first decl is in an extern "C" context, any other redeclaration
2126 // will have C language linkage. If the first one is not in an extern "C"
2127 // context, we would have reported an error for any other decl being in one.
2128 if (isFirstInExternCContext(&D))
2129 return CLanguageLinkage;
2130 return CXXLanguageLinkage;
2131}
2132
2133template<typename T>
2134static bool isDeclExternC(const T &D) {
2135 // Since the context is ignored for class members, they can only have C++
2136 // language linkage or no language linkage.
2137 const DeclContext *DC = D.getDeclContext();
2138 if (DC->isRecord()) {
2139 assert(D.getASTContext().getLangOpts().CPlusPlus)(static_cast <bool> (D.getASTContext().getLangOpts().CPlusPlus
) ? void (0) : __assert_fail ("D.getASTContext().getLangOpts().CPlusPlus"
, "clang/lib/AST/Decl.cpp", 2139, __extension__ __PRETTY_FUNCTION__
))
;
2140 return false;
2141 }
2142
2143 return D.getLanguageLinkage() == CLanguageLinkage;
2144}
2145
2146LanguageLinkage VarDecl::getLanguageLinkage() const {
2147 return getDeclLanguageLinkage(*this);
2148}
2149
2150bool VarDecl::isExternC() const {
2151 return isDeclExternC(*this);
2152}
2153
2154bool VarDecl::isInExternCContext() const {
2155 return getLexicalDeclContext()->isExternCContext();
2156}
2157
2158bool VarDecl::isInExternCXXContext() const {
2159 return getLexicalDeclContext()->isExternCXXContext();
2160}
2161
2162VarDecl *VarDecl::getCanonicalDecl() { return getFirstDecl(); }
2163
2164VarDecl::DefinitionKind
2165VarDecl::isThisDeclarationADefinition(ASTContext &C) const {
2166 if (isThisDeclarationADemotedDefinition())
2167 return DeclarationOnly;
2168
2169 // C++ [basic.def]p2:
2170 // A declaration is a definition unless [...] it contains the 'extern'
2171 // specifier or a linkage-specification and neither an initializer [...],
2172 // it declares a non-inline static data member in a class declaration [...],
2173 // it declares a static data member outside a class definition and the variable
2174 // was defined within the class with the constexpr specifier [...],
2175 // C++1y [temp.expl.spec]p15:
2176 // An explicit specialization of a static data member or an explicit
2177 // specialization of a static data member template is a definition if the
2178 // declaration includes an initializer; otherwise, it is a declaration.
2179 //
2180 // FIXME: How do you declare (but not define) a partial specialization of
2181 // a static data member template outside the containing class?
2182 if (isStaticDataMember()) {
2183 if (isOutOfLine() &&
2184 !(getCanonicalDecl()->isInline() &&
2185 getCanonicalDecl()->isConstexpr()) &&
2186 (hasInit() ||
2187 // If the first declaration is out-of-line, this may be an
2188 // instantiation of an out-of-line partial specialization of a variable
2189 // template for which we have not yet instantiated the initializer.
2190 (getFirstDecl()->isOutOfLine()
2191 ? getTemplateSpecializationKind() == TSK_Undeclared
2192 : getTemplateSpecializationKind() !=
2193 TSK_ExplicitSpecialization) ||
2194 isa<VarTemplatePartialSpecializationDecl>(this)))
2195 return Definition;
2196 if (!isOutOfLine() && isInline())
2197 return Definition;
2198 return DeclarationOnly;
2199 }
2200 // C99 6.7p5:
2201 // A definition of an identifier is a declaration for that identifier that
2202 // [...] causes storage to be reserved for that object.
2203 // Note: that applies for all non-file-scope objects.
2204 // C99 6.9.2p1:
2205 // If the declaration of an identifier for an object has file scope and an
2206 // initializer, the declaration is an external definition for the identifier
2207 if (hasInit())
2208 return Definition;
2209
2210 if (hasDefiningAttr())
2211 return Definition;
2212
2213 if (const auto *SAA = getAttr<SelectAnyAttr>())
2214 if (!SAA->isInherited())
2215 return Definition;
2216
2217 // A variable template specialization (other than a static data member
2218 // template or an explicit specialization) is a declaration until we
2219 // instantiate its initializer.
2220 if (auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(this)) {
2221 if (VTSD->getTemplateSpecializationKind() != TSK_ExplicitSpecialization &&
2222 !isa<VarTemplatePartialSpecializationDecl>(VTSD) &&
2223 !VTSD->IsCompleteDefinition)
2224 return DeclarationOnly;
2225 }
2226
2227 if (hasExternalStorage())
2228 return DeclarationOnly;
2229
2230 // [dcl.link] p7:
2231 // A declaration directly contained in a linkage-specification is treated
2232 // as if it contains the extern specifier for the purpose of determining
2233 // the linkage of the declared name and whether it is a definition.
2234 if (isSingleLineLanguageLinkage(*this))
2235 return DeclarationOnly;
2236
2237 // C99 6.9.2p2:
2238 // A declaration of an object that has file scope without an initializer,
2239 // and without a storage class specifier or the scs 'static', constitutes
2240 // a tentative definition.
2241 // No such thing in C++.
2242 if (!C.getLangOpts().CPlusPlus && isFileVarDecl())
2243 return TentativeDefinition;
2244
2245 // What's left is (in C, block-scope) declarations without initializers or
2246 // external storage. These are definitions.
2247 return Definition;
2248}
2249
2250VarDecl *VarDecl::getActingDefinition() {
2251 DefinitionKind Kind = isThisDeclarationADefinition();
2252 if (Kind != TentativeDefinition)
2253 return nullptr;
2254
2255 VarDecl *LastTentative = nullptr;
2256
2257 // Loop through the declaration chain, starting with the most recent.
2258 for (VarDecl *Decl = getMostRecentDecl(); Decl;
2259 Decl = Decl->getPreviousDecl()) {
2260 Kind = Decl->isThisDeclarationADefinition();
2261 if (Kind == Definition)
2262 return nullptr;
2263 // Record the first (most recent) TentativeDefinition that is encountered.
2264 if (Kind == TentativeDefinition && !LastTentative)
2265 LastTentative = Decl;
2266 }
2267
2268 return LastTentative;
2269}
2270
2271VarDecl *VarDecl::getDefinition(ASTContext &C) {
2272 VarDecl *First = getFirstDecl();
2273 for (auto I : First->redecls()) {
2274 if (I->isThisDeclarationADefinition(C) == Definition)
2275 return I;
2276 }
2277 return nullptr;
2278}
2279
2280VarDecl::DefinitionKind VarDecl::hasDefinition(ASTContext &C) const {
2281 DefinitionKind Kind = DeclarationOnly;
2282
2283 const VarDecl *First = getFirstDecl();
2284 for (auto I : First->redecls()) {
2285 Kind = std::max(Kind, I->isThisDeclarationADefinition(C));
2286 if (Kind == Definition)
2287 break;
2288 }
2289
2290 return Kind;
2291}
2292
2293const Expr *VarDecl::getAnyInitializer(const VarDecl *&D) const {
2294 for (auto I : redecls()) {
2295 if (auto Expr = I->getInit()) {
2296 D = I;
2297 return Expr;
2298 }
2299 }
2300 return nullptr;
2301}
2302
2303bool VarDecl::hasInit() const {
2304 if (auto *P = dyn_cast<ParmVarDecl>(this))
2305 if (P->hasUnparsedDefaultArg() || P->hasUninstantiatedDefaultArg())
2306 return false;
2307
2308 return !Init.isNull();
2309}
2310
2311Expr *VarDecl::getInit() {
2312 if (!hasInit())
2313 return nullptr;
2314
2315 if (auto *S = Init.dyn_cast<Stmt *>())
2316 return cast<Expr>(S);
2317
2318 return cast_or_null<Expr>(Init.get<EvaluatedStmt *>()->Value);
2319}
2320
2321Stmt **VarDecl::getInitAddress() {
2322 if (auto *ES = Init.dyn_cast<EvaluatedStmt *>())
2323 return &ES->Value;
2324
2325 return Init.getAddrOfPtr1();
2326}
2327
2328VarDecl *VarDecl::getInitializingDeclaration() {
2329 VarDecl *Def = nullptr;
2330 for (auto I : redecls()) {
2331 if (I->hasInit())
2332 return I;
2333
2334 if (I->isThisDeclarationADefinition()) {
2335 if (isStaticDataMember())
2336 return I;
2337 Def = I;
2338 }
2339 }
2340 return Def;
2341}
2342
2343bool VarDecl::isOutOfLine() const {
2344 if (Decl::isOutOfLine())
2345 return true;
2346
2347 if (!isStaticDataMember())
2348 return false;
2349
2350 // If this static data member was instantiated from a static data member of
2351 // a class template, check whether that static data member was defined
2352 // out-of-line.
2353 if (VarDecl *VD = getInstantiatedFromStaticDataMember())
2354 return VD->isOutOfLine();
2355
2356 return false;
2357}
2358
2359void VarDecl::setInit(Expr *I) {
2360 if (auto *Eval = Init.dyn_cast<EvaluatedStmt *>()) {
2361 Eval->~EvaluatedStmt();
2362 getASTContext().Deallocate(Eval);
2363 }
2364
2365 Init = I;
2366}
2367
2368bool VarDecl::mightBeUsableInConstantExpressions(const ASTContext &C) const {
2369 const LangOptions &Lang = C.getLangOpts();
2370
2371 // OpenCL permits const integral variables to be used in constant
2372 // expressions, like in C++98.
2373 if (!Lang.CPlusPlus && !Lang.OpenCL)
2374 return false;
2375
2376 // Function parameters are never usable in constant expressions.
2377 if (isa<ParmVarDecl>(this))
2378 return false;
2379
2380 // The values of weak variables are never usable in constant expressions.
2381 if (isWeak())
2382 return false;
2383
2384 // In C++11, any variable of reference type can be used in a constant
2385 // expression if it is initialized by a constant expression.
2386 if (Lang.CPlusPlus11 && getType()->isReferenceType())
2387 return true;
2388
2389 // Only const objects can be used in constant expressions in C++. C++98 does
2390 // not require the variable to be non-volatile, but we consider this to be a
2391 // defect.
2392 if (!getType().isConstant(C) || getType().isVolatileQualified())
2393 return false;
2394
2395 // In C++, const, non-volatile variables of integral or enumeration types
2396 // can be used in constant expressions.
2397 if (getType()->isIntegralOrEnumerationType())
2398 return true;
2399
2400 // Additionally, in C++11, non-volatile constexpr variables can be used in
2401 // constant expressions.
2402 return Lang.CPlusPlus11 && isConstexpr();
2403}
2404
2405bool VarDecl::isUsableInConstantExpressions(const ASTContext &Context) const {
2406 // C++2a [expr.const]p3:
2407 // A variable is usable in constant expressions after its initializing
2408 // declaration is encountered...
2409 const VarDecl *DefVD = nullptr;
2410 const Expr *Init = getAnyInitializer(DefVD);
2411 if (!Init || Init->isValueDependent() || getType()->isDependentType())
2412 return false;
2413 // ... if it is a constexpr variable, or it is of reference type or of
2414 // const-qualified integral or enumeration type, ...
2415 if (!DefVD->mightBeUsableInConstantExpressions(Context))
2416 return false;
2417 // ... and its initializer is a constant initializer.
2418 if (Context.getLangOpts().CPlusPlus && !DefVD->hasConstantInitialization())
2419 return false;
2420 // C++98 [expr.const]p1:
2421 // An integral constant-expression can involve only [...] const variables
2422 // or static data members of integral or enumeration types initialized with
2423 // [integer] constant expressions (dcl.init)
2424 if ((Context.getLangOpts().CPlusPlus || Context.getLangOpts().OpenCL) &&
2425 !Context.getLangOpts().CPlusPlus11 && !DefVD->hasICEInitializer(Context))
2426 return false;
2427 return true;
2428}
2429
2430/// Convert the initializer for this declaration to the elaborated EvaluatedStmt
2431/// form, which contains extra information on the evaluated value of the
2432/// initializer.
2433EvaluatedStmt *VarDecl::ensureEvaluatedStmt() const {
2434 auto *Eval = Init.dyn_cast<EvaluatedStmt *>();
2435 if (!Eval) {
2436 // Note: EvaluatedStmt contains an APValue, which usually holds
2437 // resources not allocated from the ASTContext. We need to do some
2438 // work to avoid leaking those, but we do so in VarDecl::evaluateValue
2439 // where we can detect whether there's anything to clean up or not.
2440 Eval = new (getASTContext()) EvaluatedStmt;
2441 Eval->Value = Init.get<Stmt *>();
2442 Init = Eval;
2443 }
2444 return Eval;
2445}
2446
2447EvaluatedStmt *VarDecl::getEvaluatedStmt() const {
2448 return Init.dyn_cast<EvaluatedStmt *>();
2449}
2450
2451APValue *VarDecl::evaluateValue() const {
2452 SmallVector<PartialDiagnosticAt, 8> Notes;
2453 return evaluateValueImpl(Notes, hasConstantInitialization());
2454}
2455
2456APValue *VarDecl::evaluateValueImpl(SmallVectorImpl<PartialDiagnosticAt> &Notes,
2457 bool IsConstantInitialization) const {
2458 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2459
2460 const auto *Init = cast<Expr>(Eval->Value);
2461 assert(!Init->isValueDependent())(static_cast <bool> (!Init->isValueDependent()) ? void
(0) : __assert_fail ("!Init->isValueDependent()", "clang/lib/AST/Decl.cpp"
, 2461, __extension__ __PRETTY_FUNCTION__))
;
2462
2463 // We only produce notes indicating why an initializer is non-constant the
2464 // first time it is evaluated. FIXME: The notes won't always be emitted the
2465 // first time we try evaluation, so might not be produced at all.
2466 if (Eval->WasEvaluated)
2467 return Eval->Evaluated.isAbsent() ? nullptr : &Eval->Evaluated;
2468
2469 if (Eval->IsEvaluating) {
2470 // FIXME: Produce a diagnostic for self-initialization.
2471 return nullptr;
2472 }
2473
2474 Eval->IsEvaluating = true;
2475
2476 ASTContext &Ctx = getASTContext();
2477 bool Result = Init->EvaluateAsInitializer(Eval->Evaluated, Ctx, this, Notes,
2478 IsConstantInitialization);
2479
2480 // In C++11, this isn't a constant initializer if we produced notes. In that
2481 // case, we can't keep the result, because it may only be correct under the
2482 // assumption that the initializer is a constant context.
2483 if (IsConstantInitialization && Ctx.getLangOpts().CPlusPlus11 &&
2484 !Notes.empty())
2485 Result = false;
2486
2487 // Ensure the computed APValue is cleaned up later if evaluation succeeded,
2488 // or that it's empty (so that there's nothing to clean up) if evaluation
2489 // failed.
2490 if (!Result)
2491 Eval->Evaluated = APValue();
2492 else if (Eval->Evaluated.needsCleanup())
2493 Ctx.addDestruction(&Eval->Evaluated);
2494
2495 Eval->IsEvaluating = false;
2496 Eval->WasEvaluated = true;
2497
2498 return Result ? &Eval->Evaluated : nullptr;
2499}
2500
2501APValue *VarDecl::getEvaluatedValue() const {
2502 if (EvaluatedStmt *Eval = getEvaluatedStmt())
2503 if (Eval->WasEvaluated)
2504 return &Eval->Evaluated;
2505
2506 return nullptr;
2507}
2508
2509bool VarDecl::hasICEInitializer(const ASTContext &Context) const {
2510 const Expr *Init = getInit();
2511 assert(Init && "no initializer")(static_cast <bool> (Init && "no initializer") ?
void (0) : __assert_fail ("Init && \"no initializer\""
, "clang/lib/AST/Decl.cpp", 2511, __extension__ __PRETTY_FUNCTION__
))
;
2512
2513 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2514 if (!Eval->CheckedForICEInit) {
2515 Eval->CheckedForICEInit = true;
2516 Eval->HasICEInit = Init->isIntegerConstantExpr(Context);
2517 }
2518 return Eval->HasICEInit;
2519}
2520
2521bool VarDecl::hasConstantInitialization() const {
2522 // In C, all globals (and only globals) have constant initialization.
2523 if (hasGlobalStorage() && !getASTContext().getLangOpts().CPlusPlus)
2524 return true;
2525
2526 // In C++, it depends on whether the evaluation at the point of definition
2527 // was evaluatable as a constant initializer.
2528 if (EvaluatedStmt *Eval = getEvaluatedStmt())
2529 return Eval->HasConstantInitialization;
2530
2531 return false;
2532}
2533
2534bool VarDecl::checkForConstantInitialization(
2535 SmallVectorImpl<PartialDiagnosticAt> &Notes) const {
2536 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2537 // If we ask for the value before we know whether we have a constant
2538 // initializer, we can compute the wrong value (for example, due to
2539 // std::is_constant_evaluated()).
2540 assert(!Eval->WasEvaluated &&(static_cast <bool> (!Eval->WasEvaluated && "already evaluated var value before checking for constant init"
) ? void (0) : __assert_fail ("!Eval->WasEvaluated && \"already evaluated var value before checking for constant init\""
, "clang/lib/AST/Decl.cpp", 2541, __extension__ __PRETTY_FUNCTION__
))
2541 "already evaluated var value before checking for constant init")(static_cast <bool> (!Eval->WasEvaluated && "already evaluated var value before checking for constant init"
) ? void (0) : __assert_fail ("!Eval->WasEvaluated && \"already evaluated var value before checking for constant init\""
, "clang/lib/AST/Decl.cpp", 2541, __extension__ __PRETTY_FUNCTION__
))
;
2542 assert(getASTContext().getLangOpts().CPlusPlus && "only meaningful in C++")(static_cast <bool> (getASTContext().getLangOpts().CPlusPlus
&& "only meaningful in C++") ? void (0) : __assert_fail
("getASTContext().getLangOpts().CPlusPlus && \"only meaningful in C++\""
, "clang/lib/AST/Decl.cpp", 2542, __extension__ __PRETTY_FUNCTION__
))
;
2543
2544 assert(!cast<Expr>(Eval->Value)->isValueDependent())(static_cast <bool> (!cast<Expr>(Eval->Value)->
isValueDependent()) ? void (0) : __assert_fail ("!cast<Expr>(Eval->Value)->isValueDependent()"
, "clang/lib/AST/Decl.cpp", 2544, __extension__ __PRETTY_FUNCTION__
))
;
2545
2546 // Evaluate the initializer to check whether it's a constant expression.
2547 Eval->HasConstantInitialization =
2548 evaluateValueImpl(Notes, true) && Notes.empty();
2549
2550 // If evaluation as a constant initializer failed, allow re-evaluation as a
2551 // non-constant initializer if we later find we want the value.
2552 if (!Eval->HasConstantInitialization)
2553 Eval->WasEvaluated = false;
2554
2555 return Eval->HasConstantInitialization;
2556}
2557
2558bool VarDecl::isParameterPack() const {
2559 return isa<PackExpansionType>(getType());
2560}
2561
2562template<typename DeclT>
2563static DeclT *getDefinitionOrSelf(DeclT *D) {
2564 assert(D)(static_cast <bool> (D) ? void (0) : __assert_fail ("D"
, "clang/lib/AST/Decl.cpp", 2564, __extension__ __PRETTY_FUNCTION__
))
;
2565 if (auto *Def = D->getDefinition())
2566 return Def;
2567 return D;
2568}
2569
2570bool VarDecl::isEscapingByref() const {
2571 return hasAttr<BlocksAttr>() && NonParmVarDeclBits.EscapingByref;
2572}
2573
2574bool VarDecl::isNonEscapingByref() const {
2575 return hasAttr<BlocksAttr>() && !NonParmVarDeclBits.EscapingByref;
2576}
2577
2578bool VarDecl::hasDependentAlignment() const {
2579 QualType T = getType();
2580 return T->isDependentType() || T->isUndeducedAutoType() ||
2581 llvm::any_of(specific_attrs<AlignedAttr>(), [](const AlignedAttr *AA) {
2582 return AA->isAlignmentDependent();
2583 });
2584}
2585
2586VarDecl *VarDecl::getTemplateInstantiationPattern() const {
2587 const VarDecl *VD = this;
2588
2589 // If this is an instantiated member, walk back to the template from which
2590 // it was instantiated.
2591 if (MemberSpecializationInfo *MSInfo = VD->getMemberSpecializationInfo()) {
2592 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
2593 VD = VD->getInstantiatedFromStaticDataMember();
2594 while (auto *NewVD = VD->getInstantiatedFromStaticDataMember())
2595 VD = NewVD;
2596 }
2597 }
2598
2599 // If it's an instantiated variable template specialization, find the
2600 // template or partial specialization from which it was instantiated.
2601 if (auto *VDTemplSpec = dyn_cast<VarTemplateSpecializationDecl>(VD)) {
2602 if (isTemplateInstantiation(VDTemplSpec->getTemplateSpecializationKind())) {
2603 auto From = VDTemplSpec->getInstantiatedFrom();
2604 if (auto *VTD = From.dyn_cast<VarTemplateDecl *>()) {
2605 while (!VTD->isMemberSpecialization()) {
2606 auto *NewVTD = VTD->getInstantiatedFromMemberTemplate();
2607 if (!NewVTD)
2608 break;
2609 VTD = NewVTD;
2610 }
2611 return getDefinitionOrSelf(VTD->getTemplatedDecl());
2612 }
2613 if (auto *VTPSD =
2614 From.dyn_cast<VarTemplatePartialSpecializationDecl *>()) {
2615 while (!VTPSD->isMemberSpecialization()) {
2616 auto *NewVTPSD = VTPSD->getInstantiatedFromMember();
2617 if (!NewVTPSD)
2618 break;
2619 VTPSD = NewVTPSD;
2620 }
2621 return getDefinitionOrSelf<VarDecl>(VTPSD);
2622 }
2623 }
2624 }
2625
2626 // If this is the pattern of a variable template, find where it was
2627 // instantiated from. FIXME: Is this necessary?
2628 if (VarTemplateDecl *VarTemplate = VD->getDescribedVarTemplate()) {
2629 while (!VarTemplate->isMemberSpecialization()) {
2630 auto *NewVT = VarTemplate->getInstantiatedFromMemberTemplate();
2631 if (!NewVT)
2632 break;
2633 VarTemplate = NewVT;
2634 }
2635
2636 return getDefinitionOrSelf(VarTemplate->getTemplatedDecl());
2637 }
2638
2639 if (VD == this)
2640 return nullptr;
2641 return getDefinitionOrSelf(const_cast<VarDecl*>(VD));
2642}
2643
2644VarDecl *VarDecl::getInstantiatedFromStaticDataMember() const {
2645 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2646 return cast<VarDecl>(MSI->getInstantiatedFrom());
2647
2648 return nullptr;
2649}
2650
2651TemplateSpecializationKind VarDecl::getTemplateSpecializationKind() const {
2652 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2653 return Spec->getSpecializationKind();
2654
2655 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2656 return MSI->getTemplateSpecializationKind();
2657
2658 return TSK_Undeclared;
2659}
2660
2661TemplateSpecializationKind
2662VarDecl::getTemplateSpecializationKindForInstantiation() const {
2663 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2664 return MSI->getTemplateSpecializationKind();
2665
2666 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2667 return Spec->getSpecializationKind();
2668
2669 return TSK_Undeclared;
2670}
2671
2672SourceLocation VarDecl::getPointOfInstantiation() const {
2673 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2674 return Spec->getPointOfInstantiation();
2675
2676 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2677 return MSI->getPointOfInstantiation();
2678
2679 return SourceLocation();
2680}
2681
2682VarTemplateDecl *VarDecl::getDescribedVarTemplate() const {
2683 return getASTContext().getTemplateOrSpecializationInfo(this)
2684 .dyn_cast<VarTemplateDecl *>();
2685}
2686
2687void VarDecl::setDescribedVarTemplate(VarTemplateDecl *Template) {
2688 getASTContext().setTemplateOrSpecializationInfo(this, Template);
2689}
2690
2691bool VarDecl::isKnownToBeDefined() const {
2692 const auto &LangOpts = getASTContext().getLangOpts();
2693 // In CUDA mode without relocatable device code, variables of form 'extern
2694 // __shared__ Foo foo[]' are pointers to the base of the GPU core's shared
2695 // memory pool. These are never undefined variables, even if they appear
2696 // inside of an anon namespace or static function.
2697 //
2698 // With CUDA relocatable device code enabled, these variables don't get
2699 // special handling; they're treated like regular extern variables.
2700 if (LangOpts.CUDA && !LangOpts.GPURelocatableDeviceCode &&
2701 hasExternalStorage() && hasAttr<CUDASharedAttr>() &&
2702 isa<IncompleteArrayType>(getType()))
2703 return true;
2704
2705 return hasDefinition();
2706}
2707
2708bool VarDecl::isNoDestroy(const ASTContext &Ctx) const {
2709 return hasGlobalStorage() && (hasAttr<NoDestroyAttr>() ||
2710 (!Ctx.getLangOpts().RegisterStaticDestructors &&
2711 !hasAttr<AlwaysDestroyAttr>()));
2712}
2713
2714QualType::DestructionKind
2715VarDecl::needsDestruction(const ASTContext &Ctx) const {
2716 if (EvaluatedStmt *Eval = getEvaluatedStmt())
2717 if (Eval->HasConstantDestruction)
2718 return QualType::DK_none;
2719
2720 if (isNoDestroy(Ctx))
2721 return QualType::DK_none;
2722
2723 return getType().isDestructedType();
2724}
2725
2726bool VarDecl::hasFlexibleArrayInit(const ASTContext &Ctx) const {
2727 assert(hasInit() && "Expect initializer to check for flexible array init")(static_cast <bool> (hasInit() && "Expect initializer to check for flexible array init"
) ? void (0) : __assert_fail ("hasInit() && \"Expect initializer to check for flexible array init\""
, "clang/lib/AST/Decl.cpp", 2727, __extension__ __PRETTY_FUNCTION__
))
;
2728 auto *Ty = getType()->getAs<RecordType>();
2729 if (!Ty || !Ty->getDecl()->hasFlexibleArrayMember())
2730 return false;
2731 auto *List = dyn_cast<InitListExpr>(getInit()->IgnoreParens());
2732 if (!List)
2733 return false;
2734 const Expr *FlexibleInit = List->getInit(List->getNumInits() - 1);
2735 auto InitTy = Ctx.getAsConstantArrayType(FlexibleInit->getType());
2736 if (!InitTy)
2737 return false;
2738 return InitTy->getSize() != 0;
2739}
2740
2741CharUnits VarDecl::getFlexibleArrayInitChars(const ASTContext &Ctx) const {
2742 assert(hasInit() && "Expect initializer to check for flexible array init")(static_cast <bool> (hasInit() && "Expect initializer to check for flexible array init"
) ? void (0) : __assert_fail ("hasInit() && \"Expect initializer to check for flexible array init\""
, "clang/lib/AST/Decl.cpp", 2742, __extension__ __PRETTY_FUNCTION__
))
;
2743 auto *Ty = getType()->getAs<RecordType>();
2744 if (!Ty || !Ty->getDecl()->hasFlexibleArrayMember())
2745 return CharUnits::Zero();
2746 auto *List = dyn_cast<InitListExpr>(getInit()->IgnoreParens());
2747 if (!List)
2748 return CharUnits::Zero();
2749 const Expr *FlexibleInit = List->getInit(List->getNumInits() - 1);
2750 auto InitTy = Ctx.getAsConstantArrayType(FlexibleInit->getType());
2751 if (!InitTy)
2752 return CharUnits::Zero();
2753 CharUnits FlexibleArraySize = Ctx.getTypeSizeInChars(InitTy);
2754 const ASTRecordLayout &RL = Ctx.getASTRecordLayout(Ty->getDecl());
2755 CharUnits FlexibleArrayOffset =
2756 Ctx.toCharUnitsFromBits(RL.getFieldOffset(RL.getFieldCount() - 1));
2757 if (FlexibleArrayOffset + FlexibleArraySize < RL.getSize())
2758 return CharUnits::Zero();
2759 return FlexibleArrayOffset + FlexibleArraySize - RL.getSize();
2760}
2761
2762MemberSpecializationInfo *VarDecl::getMemberSpecializationInfo() const {
2763 if (isStaticDataMember())
2764 // FIXME: Remove ?
2765 // return getASTContext().getInstantiatedFromStaticDataMember(this);
2766 return getASTContext().getTemplateOrSpecializationInfo(this)
2767 .dyn_cast<MemberSpecializationInfo *>();
2768 return nullptr;
2769}
2770
2771void VarDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
2772 SourceLocation PointOfInstantiation) {
2773 assert((isa<VarTemplateSpecializationDecl>(this) ||(static_cast <bool> ((isa<VarTemplateSpecializationDecl
>(this) || getMemberSpecializationInfo()) && "not a variable or static data member template specialization"
) ? void (0) : __assert_fail ("(isa<VarTemplateSpecializationDecl>(this) || getMemberSpecializationInfo()) && \"not a variable or static data member template specialization\""
, "clang/lib/AST/Decl.cpp", 2775, __extension__ __PRETTY_FUNCTION__
))
2774 getMemberSpecializationInfo()) &&(static_cast <bool> ((isa<VarTemplateSpecializationDecl
>(this) || getMemberSpecializationInfo()) && "not a variable or static data member template specialization"
) ? void (0) : __assert_fail ("(isa<VarTemplateSpecializationDecl>(this) || getMemberSpecializationInfo()) && \"not a variable or static data member template specialization\""
, "clang/lib/AST/Decl.cpp", 2775, __extension__ __PRETTY_FUNCTION__
))
2775 "not a variable or static data member template specialization")(static_cast <bool> ((isa<VarTemplateSpecializationDecl
>(this) || getMemberSpecializationInfo()) && "not a variable or static data member template specialization"
) ? void (0) : __assert_fail ("(isa<VarTemplateSpecializationDecl>(this) || getMemberSpecializationInfo()) && \"not a variable or static data member template specialization\""
, "clang/lib/AST/Decl.cpp", 2775, __extension__ __PRETTY_FUNCTION__
))
;
2776
2777 if (VarTemplateSpecializationDecl *Spec =
2778 dyn_cast<VarTemplateSpecializationDecl>(this)) {
2779 Spec->setSpecializationKind(TSK);
2780 if (TSK != TSK_ExplicitSpecialization &&
2781 PointOfInstantiation.isValid() &&
2782 Spec->getPointOfInstantiation().isInvalid()) {
2783 Spec->setPointOfInstantiation(PointOfInstantiation);
2784 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
2785 L->InstantiationRequested(this);
2786 }
2787 } else if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo()) {
2788 MSI->setTemplateSpecializationKind(TSK);
2789 if (TSK != TSK_ExplicitSpecialization && PointOfInstantiation.isValid() &&
2790 MSI->getPointOfInstantiation().isInvalid()) {
2791 MSI->setPointOfInstantiation(PointOfInstantiation);
2792 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
2793 L->InstantiationRequested(this);
2794 }
2795 }
2796}
2797
2798void
2799VarDecl::setInstantiationOfStaticDataMember(VarDecl *VD,
2800 TemplateSpecializationKind TSK) {
2801 assert(getASTContext().getTemplateOrSpecializationInfo(this).isNull() &&(static_cast <bool> (getASTContext().getTemplateOrSpecializationInfo
(this).isNull() && "Previous template or instantiation?"
) ? void (0) : __assert_fail ("getASTContext().getTemplateOrSpecializationInfo(this).isNull() && \"Previous template or instantiation?\""
, "clang/lib/AST/Decl.cpp", 2802, __extension__ __PRETTY_FUNCTION__
))
2802 "Previous template or instantiation?")(static_cast <bool> (getASTContext().getTemplateOrSpecializationInfo
(this).isNull() && "Previous template or instantiation?"
) ? void (0) : __assert_fail ("getASTContext().getTemplateOrSpecializationInfo(this).isNull() && \"Previous template or instantiation?\""
, "clang/lib/AST/Decl.cpp", 2802, __extension__ __PRETTY_FUNCTION__
))
;
2803 getASTContext().setInstantiatedFromStaticDataMember(this, VD, TSK);
2804}
2805
2806//===----------------------------------------------------------------------===//
2807// ParmVarDecl Implementation
2808//===----------------------------------------------------------------------===//
2809
2810ParmVarDecl *ParmVarDecl::Create(ASTContext &C, DeclContext *DC,
2811 SourceLocation StartLoc,
2812 SourceLocation IdLoc, IdentifierInfo *Id,
2813 QualType T, TypeSourceInfo *TInfo,
2814 StorageClass S, Expr *DefArg) {
2815 return new (C, DC) ParmVarDecl(ParmVar, C, DC, StartLoc, IdLoc, Id, T, TInfo,
2816 S, DefArg);
2817}
2818
2819QualType ParmVarDecl::getOriginalType() const {
2820 TypeSourceInfo *TSI = getTypeSourceInfo();
2821 QualType T = TSI ? TSI->getType() : getType();
2822 if (const auto *DT = dyn_cast<DecayedType>(T))
2823 return DT->getOriginalType();
2824 return T;
2825}
2826
2827ParmVarDecl *ParmVarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
2828 return new (C, ID)
2829 ParmVarDecl(ParmVar, C, nullptr, SourceLocation(), SourceLocation(),
2830 nullptr, QualType(), nullptr, SC_None, nullptr);
2831}
2832
2833SourceRange ParmVarDecl::getSourceRange() const {
2834 if (!hasInheritedDefaultArg()) {
2835 SourceRange ArgRange = getDefaultArgRange();
2836 if (ArgRange.isValid())
2837 return SourceRange(getOuterLocStart(), ArgRange.getEnd());
2838 }
2839
2840 // DeclaratorDecl considers the range of postfix types as overlapping with the
2841 // declaration name, but this is not the case with parameters in ObjC methods.
2842 if (isa<ObjCMethodDecl>(getDeclContext()))
2843 return SourceRange(DeclaratorDecl::getBeginLoc(), getLocation());
2844
2845 return DeclaratorDecl::getSourceRange();
2846}
2847
2848bool ParmVarDecl::isDestroyedInCallee() const {
2849 // ns_consumed only affects code generation in ARC
2850 if (hasAttr<NSConsumedAttr>())
2851 return getASTContext().getLangOpts().ObjCAutoRefCount;
2852
2853 // FIXME: isParamDestroyedInCallee() should probably imply
2854 // isDestructedType()
2855 auto *RT = getType()->getAs<RecordType>();
2856 if (RT && RT->getDecl()->isParamDestroyedInCallee() &&
2857 getType().isDestructedType())
2858 return true;
2859
2860 return false;
2861}
2862
2863Expr *ParmVarDecl::getDefaultArg() {
2864 assert(!hasUnparsedDefaultArg() && "Default argument is not yet parsed!")(static_cast <bool> (!hasUnparsedDefaultArg() &&
"Default argument is not yet parsed!") ? void (0) : __assert_fail
("!hasUnparsedDefaultArg() && \"Default argument is not yet parsed!\""
, "clang/lib/AST/Decl.cpp", 2864, __extension__ __PRETTY_FUNCTION__
))
;
2865 assert(!hasUninstantiatedDefaultArg() &&(static_cast <bool> (!hasUninstantiatedDefaultArg() &&
"Default argument is not yet instantiated!") ? void (0) : __assert_fail
("!hasUninstantiatedDefaultArg() && \"Default argument is not yet instantiated!\""
, "clang/lib/AST/Decl.cpp", 2866, __extension__ __PRETTY_FUNCTION__
))
2866 "Default argument is not yet instantiated!")(static_cast <bool> (!hasUninstantiatedDefaultArg() &&
"Default argument is not yet instantiated!") ? void (0) : __assert_fail
("!hasUninstantiatedDefaultArg() && \"Default argument is not yet instantiated!\""
, "clang/lib/AST/Decl.cpp", 2866, __extension__ __PRETTY_FUNCTION__
))
;
2867
2868 Expr *Arg = getInit();
2869 if (auto *E = dyn_cast_or_null<FullExpr>(Arg))
2870 return E->getSubExpr();
2871
2872 return Arg;
2873}
2874
2875void ParmVarDecl::setDefaultArg(Expr *defarg) {
2876 ParmVarDeclBits.DefaultArgKind = DAK_Normal;
2877 Init = defarg;
2878}
2879
2880SourceRange ParmVarDecl::getDefaultArgRange() const {
2881 switch (ParmVarDeclBits.DefaultArgKind) {
2882 case DAK_None:
2883 case DAK_Unparsed:
2884 // Nothing we can do here.
2885 return SourceRange();
2886
2887 case DAK_Uninstantiated:
2888 return getUninstantiatedDefaultArg()->getSourceRange();
2889
2890 case DAK_Normal:
2891 if (const Expr *E = getInit())
2892 return E->getSourceRange();
2893
2894 // Missing an actual expression, may be invalid.
2895 return SourceRange();
2896 }
2897 llvm_unreachable("Invalid default argument kind.")::llvm::llvm_unreachable_internal("Invalid default argument kind."
, "clang/lib/AST/Decl.cpp", 2897)
;
2898}
2899
2900void ParmVarDecl::setUninstantiatedDefaultArg(Expr *arg) {
2901 ParmVarDeclBits.DefaultArgKind = DAK_Uninstantiated;
2902 Init = arg;
2903}
2904
2905Expr *ParmVarDecl::getUninstantiatedDefaultArg() {
2906 assert(hasUninstantiatedDefaultArg() &&(static_cast <bool> (hasUninstantiatedDefaultArg() &&
"Wrong kind of initialization expression!") ? void (0) : __assert_fail
("hasUninstantiatedDefaultArg() && \"Wrong kind of initialization expression!\""
, "clang/lib/AST/Decl.cpp", 2907, __extension__ __PRETTY_FUNCTION__
))
2907 "Wrong kind of initialization expression!")(static_cast <bool> (hasUninstantiatedDefaultArg() &&
"Wrong kind of initialization expression!") ? void (0) : __assert_fail
("hasUninstantiatedDefaultArg() && \"Wrong kind of initialization expression!\""
, "clang/lib/AST/Decl.cpp", 2907, __extension__ __PRETTY_FUNCTION__
))
;
2908 return cast_or_null<Expr>(Init.get<Stmt *>());
2909}
2910
2911bool ParmVarDecl::hasDefaultArg() const {
2912 // FIXME: We should just return false for DAK_None here once callers are
2913 // prepared for the case that we encountered an invalid default argument and
2914 // were unable to even build an invalid expression.
2915 return hasUnparsedDefaultArg() || hasUninstantiatedDefaultArg() ||
2916 !Init.isNull();
2917}
2918
2919void ParmVarDecl::setParameterIndexLarge(unsigned parameterIndex) {
2920 getASTContext().setParameterIndex(this, parameterIndex);
2921 ParmVarDeclBits.ParameterIndex = ParameterIndexSentinel;
2922}
2923
2924unsigned ParmVarDecl::getParameterIndexLarge() const {
2925 return getASTContext().getParameterIndex(this);
2926}
2927
2928//===----------------------------------------------------------------------===//
2929// FunctionDecl Implementation
2930//===----------------------------------------------------------------------===//
2931
2932FunctionDecl::FunctionDecl(Kind DK, ASTContext &C, DeclContext *DC,
2933 SourceLocation StartLoc,
2934 const DeclarationNameInfo &NameInfo, QualType T,
2935 TypeSourceInfo *TInfo, StorageClass S,
2936 bool UsesFPIntrin, bool isInlineSpecified,
2937 ConstexprSpecKind ConstexprKind,
2938 Expr *TrailingRequiresClause)
2939 : DeclaratorDecl(DK, DC, NameInfo.getLoc(), NameInfo.getName(), T, TInfo,
2940 StartLoc),
2941 DeclContext(DK), redeclarable_base(C), Body(), ODRHash(0),
2942 EndRangeLoc(NameInfo.getEndLoc()), DNLoc(NameInfo.getInfo()) {
2943 assert(T.isNull() || T->isFunctionType())(static_cast <bool> (T.isNull() || T->isFunctionType
()) ? void (0) : __assert_fail ("T.isNull() || T->isFunctionType()"
, "clang/lib/AST/Decl.cpp", 2943, __extension__ __PRETTY_FUNCTION__
))
;
2944 FunctionDeclBits.SClass = S;
2945 FunctionDeclBits.IsInline = isInlineSpecified;
2946 FunctionDeclBits.IsInlineSpecified = isInlineSpecified;
2947 FunctionDeclBits.IsVirtualAsWritten = false;
2948 FunctionDeclBits.IsPure = false;
2949 FunctionDeclBits.HasInheritedPrototype = false;
2950 FunctionDeclBits.HasWrittenPrototype = true;
2951 FunctionDeclBits.IsDeleted = false;
2952 FunctionDeclBits.IsTrivial = false;
2953 FunctionDeclBits.IsTrivialForCall = false;
2954 FunctionDeclBits.IsDefaulted = false;
2955 FunctionDeclBits.IsExplicitlyDefaulted = false;
2956 FunctionDeclBits.HasDefaultedFunctionInfo = false;
2957 FunctionDeclBits.HasImplicitReturnZero = false;
2958 FunctionDeclBits.IsLateTemplateParsed = false;
2959 FunctionDeclBits.ConstexprKind = static_cast<uint64_t>(ConstexprKind);
2960 FunctionDeclBits.InstantiationIsPending = false;
2961 FunctionDeclBits.UsesSEHTry = false;
2962 FunctionDeclBits.UsesFPIntrin = UsesFPIntrin;
2963 FunctionDeclBits.HasSkippedBody = false;
2964 FunctionDeclBits.WillHaveBody = false;
2965 FunctionDeclBits.IsMultiVersion = false;
2966 FunctionDeclBits.IsCopyDeductionCandidate = false;
2967 FunctionDeclBits.HasODRHash = false;
2968 if (TrailingRequiresClause)
2969 setTrailingRequiresClause(TrailingRequiresClause);
2970}
2971
2972void FunctionDecl::getNameForDiagnostic(
2973 raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const {
2974 NamedDecl::getNameForDiagnostic(OS, Policy, Qualified);
2975 const TemplateArgumentList *TemplateArgs = getTemplateSpecializationArgs();
2976 if (TemplateArgs)
2977 printTemplateArgumentList(OS, TemplateArgs->asArray(), Policy);
2978}
2979
2980bool FunctionDecl::isVariadic() const {
2981 if (const auto *FT = getType()->getAs<FunctionProtoType>())
2982 return FT->isVariadic();
2983 return false;
2984}
2985
2986FunctionDecl::DefaultedFunctionInfo *
2987FunctionDecl::DefaultedFunctionInfo::Create(ASTContext &Context,
2988 ArrayRef<DeclAccessPair> Lookups) {
2989 DefaultedFunctionInfo *Info = new (Context.Allocate(
2990 totalSizeToAlloc<DeclAccessPair>(Lookups.size()),
2991 std::max(alignof(DefaultedFunctionInfo), alignof(DeclAccessPair))))
2992 DefaultedFunctionInfo;
2993 Info->NumLookups = Lookups.size();
2994 std::uninitialized_copy(Lookups.begin(), Lookups.end(),
2995 Info->getTrailingObjects<DeclAccessPair>());
2996 return Info;
2997}
2998
2999void FunctionDecl::setDefaultedFunctionInfo(DefaultedFunctionInfo *Info) {
3000 assert(!FunctionDeclBits.HasDefaultedFunctionInfo && "already have this")(static_cast <bool> (!FunctionDeclBits.HasDefaultedFunctionInfo
&& "already have this") ? void (0) : __assert_fail (
"!FunctionDeclBits.HasDefaultedFunctionInfo && \"already have this\""
, "clang/lib/AST/Decl.cpp", 3000, __extension__ __PRETTY_FUNCTION__
))
;
3001 assert(!Body && "can't replace function body with defaulted function info")(static_cast <bool> (!Body && "can't replace function body with defaulted function info"
) ? void (0) : __assert_fail ("!Body && \"can't replace function body with defaulted function info\""
, "clang/lib/AST/Decl.cpp", 3001, __extension__ __PRETTY_FUNCTION__
))
;
3002
3003 FunctionDeclBits.HasDefaultedFunctionInfo = true;
3004 DefaultedInfo = Info;
3005}
3006
3007FunctionDecl::DefaultedFunctionInfo *
3008FunctionDecl::getDefaultedFunctionInfo() const {
3009 return FunctionDeclBits.HasDefaultedFunctionInfo ? DefaultedInfo : nullptr;
3010}
3011
3012bool FunctionDecl::hasBody(const FunctionDecl *&Definition) const {
3013 for (auto I : redecls()) {
3014 if (I->doesThisDeclarationHaveABody()) {
3015 Definition = I;
3016 return true;
3017 }
3018 }
3019
3020 return false;
3021}
3022
3023bool FunctionDecl::hasTrivialBody() const {
3024 Stmt *S = getBody();
3025 if (!S) {
3026 // Since we don't have a body for this function, we don't know if it's
3027 // trivial or not.
3028 return false;
3029 }
3030
3031 if (isa<CompoundStmt>(S) && cast<CompoundStmt>(S)->body_empty())
3032 return true;
3033 return false;
3034}
3035
3036bool FunctionDecl::isThisDeclarationInstantiatedFromAFriendDefinition() const {
3037 if (!getFriendObjectKind())
3038 return false;
3039
3040 // Check for a friend function instantiated from a friend function
3041 // definition in a templated class.
3042 if (const FunctionDecl *InstantiatedFrom =
3043 getInstantiatedFromMemberFunction())
3044 return InstantiatedFrom->getFriendObjectKind() &&
3045 InstantiatedFrom->isThisDeclarationADefinition();
3046
3047 // Check for a friend function template instantiated from a friend
3048 // function template definition in a templated class.
3049 if (const FunctionTemplateDecl *Template = getDescribedFunctionTemplate()) {
3050 if (const FunctionTemplateDecl *InstantiatedFrom =
3051 Template->getInstantiatedFromMemberTemplate())
3052 return InstantiatedFrom->getFriendObjectKind() &&
3053 InstantiatedFrom->isThisDeclarationADefinition();
3054 }
3055
3056 return false;
3057}
3058
3059bool FunctionDecl::isDefined(const FunctionDecl *&Definition,
3060 bool CheckForPendingFriendDefinition) const {
3061 for (const FunctionDecl *FD : redecls()) {
3062 if (FD->isThisDeclarationADefinition()) {
3063 Definition = FD;
3064 return true;
3065 }
3066
3067 // If this is a friend function defined in a class template, it does not
3068 // have a body until it is used, nevertheless it is a definition, see
3069 // [temp.inst]p2:
3070 //
3071 // ... for the purpose of determining whether an instantiated redeclaration
3072 // is valid according to [basic.def.odr] and [class.mem], a declaration that
3073 // corresponds to a definition in the template is considered to be a
3074 // definition.
3075 //
3076 // The following code must produce redefinition error:
3077 //
3078 // template<typename T> struct C20 { friend void func_20() {} };
3079 // C20<int> c20i;
3080 // void func_20() {}
3081 //
3082 if (CheckForPendingFriendDefinition &&
3083 FD->isThisDeclarationInstantiatedFromAFriendDefinition()) {
3084 Definition = FD;
3085 return true;
3086 }
3087 }
3088
3089 return false;
3090}
3091
3092Stmt *FunctionDecl::getBody(const FunctionDecl *&Definition) const {
3093 if (!hasBody(Definition))
3094 return nullptr;
3095
3096 assert(!Definition->FunctionDeclBits.HasDefaultedFunctionInfo &&(static_cast <bool> (!Definition->FunctionDeclBits.HasDefaultedFunctionInfo
&& "definition should not have a body") ? void (0) :
__assert_fail ("!Definition->FunctionDeclBits.HasDefaultedFunctionInfo && \"definition should not have a body\""
, "clang/lib/AST/Decl.cpp", 3097, __extension__ __PRETTY_FUNCTION__
))
3097 "definition should not have a body")(static_cast <bool> (!Definition->FunctionDeclBits.HasDefaultedFunctionInfo
&& "definition should not have a body") ? void (0) :
__assert_fail ("!Definition->FunctionDeclBits.HasDefaultedFunctionInfo && \"definition should not have a body\""
, "clang/lib/AST/Decl.cpp", 3097, __extension__ __PRETTY_FUNCTION__
))
;
3098 if (Definition->Body)
3099 return Definition->Body.get(getASTContext().getExternalSource());
3100
3101 return nullptr;
3102}
3103
3104void FunctionDecl::setBody(Stmt *B) {
3105 FunctionDeclBits.HasDefaultedFunctionInfo = false;
3106 Body = LazyDeclStmtPtr(B);
3107 if (B)
3108 EndRangeLoc = B->getEndLoc();
3109}
3110
3111void FunctionDecl::setPure(bool P) {
3112 FunctionDeclBits.IsPure = P;
3113 if (P)
3114 if (auto *Parent = dyn_cast<CXXRecordDecl>(getDeclContext()))
3115 Parent->markedVirtualFunctionPure();
3116}
3117
3118template<std::size_t Len>
3119static bool isNamed(const NamedDecl *ND, const char (&Str)[Len]) {
3120 IdentifierInfo *II = ND->getIdentifier();
3121 return II && II->isStr(Str);
3122}
3123
3124bool FunctionDecl::isMain() const {
3125 const TranslationUnitDecl *tunit =
3126 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
3127 return tunit &&
3128 !tunit->getASTContext().getLangOpts().Freestanding &&
3129 isNamed(this, "main");
3130}
3131
3132bool FunctionDecl::isMSVCRTEntryPoint() const {
3133 const TranslationUnitDecl *TUnit =
3134 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
3135 if (!TUnit)
3136 return false;
3137
3138 // Even though we aren't really targeting MSVCRT if we are freestanding,
3139 // semantic analysis for these functions remains the same.
3140
3141 // MSVCRT entry points only exist on MSVCRT targets.
3142 if (!TUnit->getASTContext().getTargetInfo().getTriple().isOSMSVCRT())
3143 return false;
3144
3145 // Nameless functions like constructors cannot be entry points.
3146 if (!getIdentifier())
3147 return false;
3148
3149 return llvm::StringSwitch<bool>(getName())
3150 .Cases("main", // an ANSI console app
3151 "wmain", // a Unicode console App
3152 "WinMain", // an ANSI GUI app
3153 "wWinMain", // a Unicode GUI app
3154 "DllMain", // a DLL
3155 true)
3156 .Default(false);
3157}
3158
3159bool FunctionDecl::isReservedGlobalPlacementOperator() const {
3160 assert(getDeclName().getNameKind() == DeclarationName::CXXOperatorName)(static_cast <bool> (getDeclName().getNameKind() == DeclarationName
::CXXOperatorName) ? void (0) : __assert_fail ("getDeclName().getNameKind() == DeclarationName::CXXOperatorName"
, "clang/lib/AST/Decl.cpp", 3160, __extension__ __PRETTY_FUNCTION__
))
;
3161 assert(getDeclName().getCXXOverloadedOperator() == OO_New ||(static_cast <bool> (getDeclName().getCXXOverloadedOperator
() == OO_New || getDeclName().getCXXOverloadedOperator() == OO_Delete
|| getDeclName().getCXXOverloadedOperator() == OO_Array_New ||
getDeclName().getCXXOverloadedOperator() == OO_Array_Delete)
? void (0) : __assert_fail ("getDeclName().getCXXOverloadedOperator() == OO_New || getDeclName().getCXXOverloadedOperator() == OO_Delete || getDeclName().getCXXOverloadedOperator() == OO_Array_New || getDeclName().getCXXOverloadedOperator() == OO_Array_Delete"
, "clang/lib/AST/Decl.cpp", 3164, __extension__ __PRETTY_FUNCTION__
))
3162 getDeclName().getCXXOverloadedOperator() == OO_Delete ||(static_cast <bool> (getDeclName().getCXXOverloadedOperator
() == OO_New || getDeclName().getCXXOverloadedOperator() == OO_Delete
|| getDeclName().getCXXOverloadedOperator() == OO_Array_New ||
getDeclName().getCXXOverloadedOperator() == OO_Array_Delete)
? void (0) : __assert_fail ("getDeclName().getCXXOverloadedOperator() == OO_New || getDeclName().getCXXOverloadedOperator() == OO_Delete || getDeclName().getCXXOverloadedOperator() == OO_Array_New || getDeclName().getCXXOverloadedOperator() == OO_Array_Delete"
, "clang/lib/AST/Decl.cpp", 3164, __extension__ __PRETTY_FUNCTION__
))
3163 getDeclName().getCXXOverloadedOperator() == OO_Array_New ||(static_cast <bool> (getDeclName().getCXXOverloadedOperator
() == OO_New || getDeclName().getCXXOverloadedOperator() == OO_Delete
|| getDeclName().getCXXOverloadedOperator() == OO_Array_New ||
getDeclName().getCXXOverloadedOperator() == OO_Array_Delete)
? void (0) : __assert_fail ("getDeclName().getCXXOverloadedOperator() == OO_New || getDeclName().getCXXOverloadedOperator() == OO_Delete || getDeclName().getCXXOverloadedOperator() == OO_Array_New || getDeclName().getCXXOverloadedOperator() == OO_Array_Delete"
, "clang/lib/AST/Decl.cpp", 3164, __extension__ __PRETTY_FUNCTION__
))
3164 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete)(static_cast <bool> (getDeclName().getCXXOverloadedOperator
() == OO_New || getDeclName().getCXXOverloadedOperator() == OO_Delete
|| getDeclName().getCXXOverloadedOperator() == OO_Array_New ||
getDeclName().getCXXOverloadedOperator() == OO_Array_Delete)
? void (0) : __assert_fail ("getDeclName().getCXXOverloadedOperator() == OO_New || getDeclName().getCXXOverloadedOperator() == OO_Delete || getDeclName().getCXXOverloadedOperator() == OO_Array_New || getDeclName().getCXXOverloadedOperator() == OO_Array_Delete"
, "clang/lib/AST/Decl.cpp", 3164, __extension__ __PRETTY_FUNCTION__
))
;
3165
3166 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
3167 return false;
3168
3169 const auto *proto = getType()->castAs<FunctionProtoType>();
3170 if (proto->getNumParams() != 2 || proto->isVariadic())
3171 return false;
3172
3173 ASTContext &Context =
3174 cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext())
3175 ->getASTContext();
3176
3177 // The result type and first argument type are constant across all
3178 // these operators. The second argument must be exactly void*.
3179 return (proto->getParamType(1).getCanonicalType() == Context.VoidPtrTy);
3180}
3181
3182bool FunctionDecl::isReplaceableGlobalAllocationFunction(
3183 Optional<unsigned> *AlignmentParam, bool *IsNothrow) const {
3184 if (getDeclName().getNameKind() != DeclarationName::CXXOperatorName)
3185 return false;
3186 if (getDeclName().getCXXOverloadedOperator() != OO_New &&
3187 getDeclName().getCXXOverloadedOperator() != OO_Delete &&
3188 getDeclName().getCXXOverloadedOperator() != OO_Array_New &&
3189 getDeclName().getCXXOverloadedOperator() != OO_Array_Delete)
3190 return false;
3191
3192 if (isa<CXXRecordDecl>(getDeclContext()))
3193 return false;
3194
3195 // This can only fail for an invalid 'operator new' declaration.
3196 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
3197 return false;
3198
3199 const auto *FPT = getType()->castAs<FunctionProtoType>();
3200 if (FPT->getNumParams() == 0 || FPT->getNumParams() > 3 || FPT->isVariadic())
3201 return false;
3202
3203 // If this is a single-parameter function, it must be a replaceable global
3204 // allocation or deallocation function.
3205 if (FPT->getNumParams() == 1)
3206 return true;
3207
3208 unsigned Params = 1;
3209 QualType Ty = FPT->getParamType(Params);
3210 ASTContext &Ctx = getASTContext();
3211
3212 auto Consume = [&] {
3213 ++Params;
3214 Ty = Params < FPT->getNumParams() ? FPT->getParamType(Params) : QualType();
3215 };
3216
3217 // In C++14, the next parameter can be a 'std::size_t' for sized delete.
3218 bool IsSizedDelete = false;
3219 if (Ctx.getLangOpts().SizedDeallocation &&
3220 (getDeclName().getCXXOverloadedOperator() == OO_Delete ||
3221 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete) &&
3222 Ctx.hasSameType(Ty, Ctx.getSizeType())) {
3223 IsSizedDelete = true;
3224 Consume();
3225 }
3226
3227 // In C++17, the next parameter can be a 'std::align_val_t' for aligned
3228 // new/delete.
3229 if (Ctx.getLangOpts().AlignedAllocation && !Ty.isNull() && Ty->isAlignValT()) {
3230 Consume();
3231 if (AlignmentParam)
3232 *AlignmentParam = Params;
3233 }
3234
3235 // Finally, if this is not a sized delete, the final parameter can
3236 // be a 'const std::nothrow_t&'.
3237 if (!IsSizedDelete && !Ty.isNull() && Ty->isReferenceType()) {
3238 Ty = Ty->getPointeeType();
3239 if (Ty.getCVRQualifiers() != Qualifiers::Const)
3240 return false;
3241 if (Ty->isNothrowT()) {
3242 if (IsNothrow)
3243 *IsNothrow = true;
3244 Consume();
3245 }
3246 }
3247
3248 return Params == FPT->getNumParams();
3249}
3250
3251bool FunctionDecl::isInlineBuiltinDeclaration() const {
3252 if (!getBuiltinID())
3253 return false;
3254
3255 const FunctionDecl *Definition;
3256 return hasBody(Definition) && Definition->isInlineSpecified() &&
3257 Definition->hasAttr<AlwaysInlineAttr>() &&
3258 Definition->hasAttr<GNUInlineAttr>();
3259}
3260
3261bool FunctionDecl::isDestroyingOperatorDelete() const {
3262 // C++ P0722:
3263 // Within a class C, a single object deallocation function with signature
3264 // (T, std::destroying_delete_t, <more params>)
3265 // is a destroying operator delete.
3266 if (!isa<CXXMethodDecl>(this) || getOverloadedOperator() != OO_Delete ||
3267 getNumParams() < 2)
3268 return false;
3269
3270 auto *RD = getParamDecl(1)->getType()->getAsCXXRecordDecl();
3271 return RD && RD->isInStdNamespace() && RD->getIdentifier() &&
3272 RD->getIdentifier()->isStr("destroying_delete_t");
3273}
3274
3275LanguageLinkage FunctionDecl::getLanguageLinkage() const {
3276 return getDeclLanguageLinkage(*this);
3277}
3278
3279bool FunctionDecl::isExternC() const {
3280 return isDeclExternC(*this);
3281}
3282
3283bool FunctionDecl::isInExternCContext() const {
3284 if (hasAttr<OpenCLKernelAttr>())
3285 return true;
3286 return getLexicalDeclContext()->isExternCContext();
3287}
3288
3289bool FunctionDecl::isInExternCXXContext() const {
3290 return getLexicalDeclContext()->isExternCXXContext();
3291}
3292
3293bool FunctionDecl::isGlobal() const {
3294 if (const auto *Method = dyn_cast<CXXMethodDecl>(this))
3295 return Method->isStatic();
3296
3297 if (getCanonicalDecl()->getStorageClass() == SC_Static)
3298 return false;
3299
3300 for (const DeclContext *DC = getDeclContext();
3301 DC->isNamespace();
3302 DC = DC->getParent()) {
3303 if (const auto *Namespace = cast<NamespaceDecl>(DC)) {
3304 if (!Namespace->getDeclName())
3305 return false;
3306 }
3307 }
3308
3309 return true;
3310}
3311
3312bool FunctionDecl::isNoReturn() const {
3313 if (hasAttr<NoReturnAttr>() || hasAttr<CXX11NoReturnAttr>() ||
3314 hasAttr<C11NoReturnAttr>())
3315 return true;
3316
3317 if (auto *FnTy = getType()->getAs<FunctionType>())
3318 return FnTy->getNoReturnAttr();
3319
3320 return false;
3321}
3322
3323
3324MultiVersionKind FunctionDecl::getMultiVersionKind() const {
3325 if (hasAttr<TargetAttr>())
3326 return MultiVersionKind::Target;
3327 if (hasAttr<CPUDispatchAttr>())
3328 return MultiVersionKind::CPUDispatch;
3329 if (hasAttr<CPUSpecificAttr>())
3330 return MultiVersionKind::CPUSpecific;
3331 if (hasAttr<TargetClonesAttr>())
3332 return MultiVersionKind::TargetClones;
3333 return MultiVersionKind::None;
3334}
3335
3336bool FunctionDecl::isCPUDispatchMultiVersion() const {
3337 return isMultiVersion() && hasAttr<CPUDispatchAttr>();
3338}
3339
3340bool FunctionDecl::isCPUSpecificMultiVersion() const {
3341 return isMultiVersion() && hasAttr<CPUSpecificAttr>();
3342}
3343
3344bool FunctionDecl::isTargetMultiVersion() const {
3345 return isMultiVersion() && hasAttr<TargetAttr>();
3346}
3347
3348bool FunctionDecl::isTargetClonesMultiVersion() const {
3349 return isMultiVersion() && hasAttr<TargetClonesAttr>();
3350}
3351
3352void
3353FunctionDecl::setPreviousDeclaration(FunctionDecl *PrevDecl) {
3354 redeclarable_base::setPreviousDecl(PrevDecl);
3355
3356 if (FunctionTemplateDecl *FunTmpl = getDescribedFunctionTemplate()) {
3357 FunctionTemplateDecl *PrevFunTmpl
3358 = PrevDecl? PrevDecl->getDescribedFunctionTemplate() : nullptr;
3359 assert((!PrevDecl || PrevFunTmpl) && "Function/function template mismatch")(static_cast <bool> ((!PrevDecl || PrevFunTmpl) &&
"Function/function template mismatch") ? void (0) : __assert_fail
("(!PrevDecl || PrevFunTmpl) && \"Function/function template mismatch\""
, "clang/lib/AST/Decl.cpp", 3359, __extension__ __PRETTY_FUNCTION__
))
;
3360 FunTmpl->setPreviousDecl(PrevFunTmpl);
3361 }
3362
3363 if (PrevDecl && PrevDecl->isInlined())
3364 setImplicitlyInline(true);
3365}
3366
3367FunctionDecl *FunctionDecl::getCanonicalDecl() { return getFirstDecl(); }
3368
3369/// Returns a value indicating whether this function corresponds to a builtin
3370/// function.
3371///
3372/// The function corresponds to a built-in function if it is declared at
3373/// translation scope or within an extern "C" block and its name matches with
3374/// the name of a builtin. The returned value will be 0 for functions that do
3375/// not correspond to a builtin, a value of type \c Builtin::ID if in the
3376/// target-independent range \c [1,Builtin::First), or a target-specific builtin
3377/// value.
3378///
3379/// \param ConsiderWrapperFunctions If true, we should consider wrapper
3380/// functions as their wrapped builtins. This shouldn't be done in general, but
3381/// it's useful in Sema to diagnose calls to wrappers based on their semantics.
3382unsigned FunctionDecl::getBuiltinID(bool ConsiderWrapperFunctions) const {
3383 unsigned BuiltinID = 0;
3384
3385 if (const auto *ABAA = getAttr<ArmBuiltinAliasAttr>()) {
3386 BuiltinID = ABAA->getBuiltinName()->getBuiltinID();
3387 } else if (const auto *BAA = getAttr<BuiltinAliasAttr>()) {
3388 BuiltinID = BAA->getBuiltinName()->getBuiltinID();
3389 } else if (const auto *A = getAttr<BuiltinAttr>()) {
3390 BuiltinID = A->getID();
3391 }
3392
3393 if (!BuiltinID)
3394 return 0;
3395
3396 // If the function is marked "overloadable", it has a different mangled name
3397 // and is not the C library function.
3398 if (!ConsiderWrapperFunctions && hasAttr<OverloadableAttr>() &&
3399 (!hasAttr<ArmBuiltinAliasAttr>() && !hasAttr<BuiltinAliasAttr>()))
3400 return 0;
3401
3402 ASTContext &Context = getASTContext();
3403 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
3404 return BuiltinID;
3405
3406 // This function has the name of a known C library
3407 // function. Determine whether it actually refers to the C library
3408 // function or whether it just has the same name.
3409
3410 // If this is a static function, it's not a builtin.
3411 if (!ConsiderWrapperFunctions && getStorageClass() == SC_Static)
3412 return 0;
3413
3414 // OpenCL v1.2 s6.9.f - The library functions defined in
3415 // the C99 standard headers are not available.
3416 if (Context.getLangOpts().OpenCL &&
3417 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
3418 return 0;
3419
3420 // CUDA does not have device-side standard library. printf and malloc are the
3421 // only special cases that are supported by device-side runtime.
3422 if (Context.getLangOpts().CUDA && hasAttr<CUDADeviceAttr>() &&
3423 !hasAttr<CUDAHostAttr>() &&
3424 !(BuiltinID == Builtin::BIprintf || BuiltinID == Builtin::BImalloc))
3425 return 0;
3426
3427 // As AMDGCN implementation of OpenMP does not have a device-side standard
3428 // library, none of the predefined library functions except printf and malloc
3429 // should be treated as a builtin i.e. 0 should be returned for them.
3430 if (Context.getTargetInfo().getTriple().isAMDGCN() &&
3431 Context.getLangOpts().OpenMPIsDevice &&
3432 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID) &&
3433 !(BuiltinID == Builtin::BIprintf || BuiltinID == Builtin::BImalloc))
3434 return 0;
3435
3436 return BuiltinID;
3437}
3438
3439/// getNumParams - Return the number of parameters this function must have
3440/// based on its FunctionType. This is the length of the ParamInfo array
3441/// after it has been created.
3442unsigned FunctionDecl::getNumParams() const {
3443 const auto *FPT = getType()->getAs<FunctionProtoType>();
3444 return FPT ? FPT->getNumParams() : 0;
3445}
3446
3447void FunctionDecl::setParams(ASTContext &C,
3448 ArrayRef<ParmVarDecl *> NewParamInfo) {
3449 assert(!ParamInfo && "Already has param info!")(static_cast <bool> (!ParamInfo && "Already has param info!"
) ? void (0) : __assert_fail ("!ParamInfo && \"Already has param info!\""
, "clang/lib/AST/Decl.cpp", 3449, __extension__ __PRETTY_FUNCTION__
))
;
3450 assert(NewParamInfo.size() == getNumParams() && "Parameter count mismatch!")(static_cast <bool> (NewParamInfo.size() == getNumParams
() && "Parameter count mismatch!") ? void (0) : __assert_fail
("NewParamInfo.size() == getNumParams() && \"Parameter count mismatch!\""
, "clang/lib/AST/Decl.cpp", 3450, __extension__ __PRETTY_FUNCTION__
))
;
3451
3452 // Zero params -> null pointer.
3453 if (!NewParamInfo.empty()) {
3454 ParamInfo = new (C) ParmVarDecl*[NewParamInfo.size()];
3455 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
3456 }
3457}
3458
3459/// getMinRequiredArguments - Returns the minimum number of arguments
3460/// needed to call this function. This may be fewer than the number of
3461/// function parameters, if some of the parameters have default
3462/// arguments (in C++) or are parameter packs (C++11).
3463unsigned FunctionDecl::getMinRequiredArguments() const {
3464 if (!getASTContext().getLangOpts().CPlusPlus)
3465 return getNumParams();
3466
3467 // Note that it is possible for a parameter with no default argument to
3468 // follow a parameter with a default argument.
3469 unsigned NumRequiredArgs = 0;
3470 unsigned MinParamsSoFar = 0;
3471 for (auto *Param : parameters()) {
3472 if (!Param->isParameterPack()) {
3473 ++MinParamsSoFar;
3474 if (!Param->hasDefaultArg())
3475 NumRequiredArgs = MinParamsSoFar;
3476 }
3477 }
3478 return NumRequiredArgs;
3479}
3480
3481bool FunctionDecl::hasOneParamOrDefaultArgs() const {
3482 return getNumParams() == 1 ||
3483 (getNumParams() > 1 &&
3484 std::all_of(param_begin() + 1, param_end(),
3485 [](ParmVarDecl *P) { return P->hasDefaultArg(); }));
3486}
3487
3488/// The combination of the extern and inline keywords under MSVC forces
3489/// the function to be required.
3490///
3491/// Note: This function assumes that we will only get called when isInlined()
3492/// would return true for this FunctionDecl.
3493bool FunctionDecl::isMSExternInline() const {
3494 assert(isInlined() && "expected to get called on an inlined function!")(static_cast <bool> (isInlined() && "expected to get called on an inlined function!"
) ? void (0) : __assert_fail ("isInlined() && \"expected to get called on an inlined function!\""
, "clang/lib/AST/Decl.cpp", 3494, __extension__ __PRETTY_FUNCTION__
))
;
3495
3496 const ASTContext &Context = getASTContext();
3497 if (!Context.getTargetInfo().getCXXABI().isMicrosoft() &&
3498 !hasAttr<DLLExportAttr>())
3499 return false;
3500
3501 for (const FunctionDecl *FD = getMostRecentDecl(); FD;
3502 FD = FD->getPreviousDecl())
3503 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
3504 return true;
3505
3506 return false;
3507}
3508
3509static bool redeclForcesDefMSVC(const FunctionDecl *Redecl) {
3510 if (Redecl->getStorageClass() != SC_Extern)
3511 return false;
3512
3513 for (const FunctionDecl *FD = Redecl->getPreviousDecl(); FD;
3514 FD = FD->getPreviousDecl())
3515 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
3516 return false;
3517
3518 return true;
3519}
3520
3521static bool RedeclForcesDefC99(const FunctionDecl *Redecl) {
3522 // Only consider file-scope declarations in this test.
3523 if (!Redecl->getLexicalDeclContext()->isTranslationUnit())
3524 return false;
3525
3526 // Only consider explicit declarations; the presence of a builtin for a
3527 // libcall shouldn't affect whether a definition is externally visible.
3528 if (Redecl->isImplicit())
3529 return false;
3530
3531 if (!Redecl->isInlineSpecified() || Redecl->getStorageClass() == SC_Extern)
3532 return true; // Not an inline definition
3533
3534 return false;
3535}
3536
3537/// For a function declaration in C or C++, determine whether this
3538/// declaration causes the definition to be externally visible.
3539///
3540/// For instance, this determines if adding the current declaration to the set
3541/// of redeclarations of the given functions causes
3542/// isInlineDefinitionExternallyVisible to change from false to true.
3543bool FunctionDecl::doesDeclarationForceExternallyVisibleDefinition() const {
3544 assert(!doesThisDeclarationHaveABody() &&(static_cast <bool> (!doesThisDeclarationHaveABody() &&
"Must have a declaration without a body.") ? void (0) : __assert_fail
("!doesThisDeclarationHaveABody() && \"Must have a declaration without a body.\""
, "clang/lib/AST/Decl.cpp", 3545, __extension__ __PRETTY_FUNCTION__
))
3545 "Must have a declaration without a body.")(static_cast <bool> (!doesThisDeclarationHaveABody() &&
"Must have a declaration without a body.") ? void (0) : __assert_fail
("!doesThisDeclarationHaveABody() && \"Must have a declaration without a body.\""
, "clang/lib/AST/Decl.cpp", 3545, __extension__ __PRETTY_FUNCTION__
))
;
3546
3547 ASTContext &Context = getASTContext();
3548
3549 if (Context.getLangOpts().MSVCCompat) {
3550 const FunctionDecl *Definition;
3551 if (hasBody(Definition) && Definition->isInlined() &&
3552 redeclForcesDefMSVC(this))
3553 return true;
3554 }
3555
3556 if (Context.getLangOpts().CPlusPlus)
3557 return false;
3558
3559 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3560 // With GNU inlining, a declaration with 'inline' but not 'extern', forces
3561 // an externally visible definition.
3562 //
3563 // FIXME: What happens if gnu_inline gets added on after the first
3564 // declaration?
3565 if (!isInlineSpecified() || getStorageClass() == SC_Extern)
3566 return false;
3567
3568 const FunctionDecl *Prev = this;
3569 bool FoundBody = false;
3570 while ((Prev = Prev->getPreviousDecl())) {
3571 FoundBody |= Prev->doesThisDeclarationHaveABody();
3572
3573 if (Prev->doesThisDeclarationHaveABody()) {
3574 // If it's not the case that both 'inline' and 'extern' are
3575 // specified on the definition, then it is always externally visible.
3576 if (!Prev->isInlineSpecified() ||
3577 Prev->getStorageClass() != SC_Extern)
3578 return false;
3579 } else if (Prev->isInlineSpecified() &&
3580 Prev->getStorageClass() != SC_Extern) {
3581 return false;
3582 }
3583 }
3584 return FoundBody;
3585 }
3586
3587 // C99 6.7.4p6:
3588 // [...] If all of the file scope declarations for a function in a
3589 // translation unit include the inline function specifier without extern,
3590 // then the definition in that translation unit is an inline definition.
3591 if (isInlineSpecified() && getStorageClass() != SC_Extern)
3592 return false;
3593 const FunctionDecl *Prev = this;
3594 bool FoundBody = false;
3595 while ((Prev = Prev->getPreviousDecl())) {
3596 FoundBody |= Prev->doesThisDeclarationHaveABody();
3597 if (RedeclForcesDefC99(Prev))
3598 return false;
3599 }
3600 return FoundBody;
3601}
3602
3603FunctionTypeLoc FunctionDecl::getFunctionTypeLoc() const {
3604 const TypeSourceInfo *TSI = getTypeSourceInfo();
3605 return TSI ? TSI->getTypeLoc().IgnoreParens().getAs<FunctionTypeLoc>()
3606 : FunctionTypeLoc();
3607}
3608
3609SourceRange FunctionDecl::getReturnTypeSourceRange() const {
3610 FunctionTypeLoc FTL = getFunctionTypeLoc();
3611 if (!FTL)
3612 return SourceRange();
3613
3614 // Skip self-referential return types.
3615 const SourceManager &SM = getASTContext().getSourceManager();
3616 SourceRange RTRange = FTL.getReturnLoc().getSourceRange();
3617 SourceLocation Boundary = getNameInfo().getBeginLoc();
3618 if (RTRange.isInvalid() || Boundary.isInvalid() ||
3619 !SM.isBeforeInTranslationUnit(RTRange.getEnd(), Boundary))
3620 return SourceRange();
3621
3622 return RTRange;
3623}
3624
3625SourceRange FunctionDecl::getParametersSourceRange() const {
3626 unsigned NP = getNumParams();
3627 SourceLocation EllipsisLoc = getEllipsisLoc();
3628
3629 if (NP == 0 && EllipsisLoc.isInvalid())
3630 return SourceRange();
3631
3632 SourceLocation Begin =
3633 NP > 0 ? ParamInfo[0]->getSourceRange().getBegin() : EllipsisLoc;
3634 SourceLocation End = EllipsisLoc.isValid()
3635 ? EllipsisLoc
3636 : ParamInfo[NP - 1]->getSourceRange().getEnd();
3637
3638 return SourceRange(Begin, End);
3639}
3640
3641SourceRange FunctionDecl::getExceptionSpecSourceRange() const {
3642 FunctionTypeLoc FTL = getFunctionTypeLoc();
3643 return FTL ? FTL.getExceptionSpecRange() : SourceRange();
3644}
3645
3646/// For an inline function definition in C, or for a gnu_inline function
3647/// in C++, determine whether the definition will be externally visible.
3648///
3649/// Inline function definitions are always available for inlining optimizations.
3650/// However, depending on the language dialect, declaration specifiers, and
3651/// attributes, the definition of an inline function may or may not be
3652/// "externally" visible to other translation units in the program.
3653///
3654/// In C99, inline definitions are not externally visible by default. However,
3655/// if even one of the global-scope declarations is marked "extern inline", the
3656/// inline definition becomes externally visible (C99 6.7.4p6).
3657///
3658/// In GNU89 mode, or if the gnu_inline attribute is attached to the function
3659/// definition, we use the GNU semantics for inline, which are nearly the
3660/// opposite of C99 semantics. In particular, "inline" by itself will create
3661/// an externally visible symbol, but "extern inline" will not create an
3662/// externally visible symbol.
3663bool FunctionDecl::isInlineDefinitionExternallyVisible() const {
3664 assert((doesThisDeclarationHaveABody() || willHaveBody() ||(static_cast <bool> ((doesThisDeclarationHaveABody() ||
willHaveBody() || hasAttr<AliasAttr>()) && "Must be a function definition"
) ? void (0) : __assert_fail ("(doesThisDeclarationHaveABody() || willHaveBody() || hasAttr<AliasAttr>()) && \"Must be a function definition\""
, "clang/lib/AST/Decl.cpp", 3666, __extension__ __PRETTY_FUNCTION__
))
3665 hasAttr<AliasAttr>()) &&(static_cast <bool> ((doesThisDeclarationHaveABody() ||
willHaveBody() || hasAttr<AliasAttr>()) && "Must be a function definition"
) ? void (0) : __assert_fail ("(doesThisDeclarationHaveABody() || willHaveBody() || hasAttr<AliasAttr>()) && \"Must be a function definition\""
, "clang/lib/AST/Decl.cpp", 3666, __extension__ __PRETTY_FUNCTION__
))
3666 "Must be a function definition")(static_cast <bool> ((doesThisDeclarationHaveABody() ||
willHaveBody() || hasAttr<AliasAttr>()) && "Must be a function definition"
) ? void (0) : __assert_fail ("(doesThisDeclarationHaveABody() || willHaveBody() || hasAttr<AliasAttr>()) && \"Must be a function definition\""
, "clang/lib/AST/Decl.cpp", 3666, __extension__ __PRETTY_FUNCTION__
))
;
3667 assert(isInlined() && "Function must be inline")(static_cast <bool> (isInlined() && "Function must be inline"
) ? void (0) : __assert_fail ("isInlined() && \"Function must be inline\""
, "clang/lib/AST/Decl.cpp", 3667, __extension__ __PRETTY_FUNCTION__
))
;
3668 ASTContext &Context = getASTContext();
3669
3670 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3671 // Note: If you change the logic here, please change
3672 // doesDeclarationForceExternallyVisibleDefinition as well.
3673 //
3674 // If it's not the case that both 'inline' and 'extern' are
3675 // specified on the definition, then this inline definition is
3676 // externally visible.
3677 if (Context.getLangOpts().CPlusPlus)
3678 return false;
3679 if (!(isInlineSpecified() && getStorageClass() == SC_Extern))
3680 return true;
3681
3682 // If any declaration is 'inline' but not 'extern', then this definition
3683 // is externally visible.
3684 for (auto Redecl : redecls()) {
3685 if (Redecl->isInlineSpecified() &&
3686 Redecl->getStorageClass() != SC_Extern)
3687 return true;
3688 }
3689
3690 return false;
3691 }
3692
3693 // The rest of this function is C-only.
3694 assert(!Context.getLangOpts().CPlusPlus &&(static_cast <bool> (!Context.getLangOpts().CPlusPlus &&
"should not use C inline rules in C++") ? void (0) : __assert_fail
("!Context.getLangOpts().CPlusPlus && \"should not use C inline rules in C++\""
, "clang/lib/AST/Decl.cpp", 3695, __extension__ __PRETTY_FUNCTION__
))
3695 "should not use C inline rules in C++")(static_cast <bool> (!Context.getLangOpts().CPlusPlus &&
"should not use C inline rules in C++") ? void (0) : __assert_fail
("!Context.getLangOpts().CPlusPlus && \"should not use C inline rules in C++\""
, "clang/lib/AST/Decl.cpp", 3695, __extension__ __PRETTY_FUNCTION__
))
;
3696
3697 // C99 6.7.4p6:
3698 // [...] If all of the file scope declarations for a function in a
3699 // translation unit include the inline function specifier without extern,
3700 // then the definition in that translation unit is an inline definition.
3701 for (auto Redecl : redecls()) {
3702 if (RedeclForcesDefC99(Redecl))
3703 return true;
3704 }
3705
3706 // C99 6.7.4p6:
3707 // An inline definition does not provide an external definition for the
3708 // function, and does not forbid an external definition in another
3709 // translation unit.
3710 return false;
3711}
3712
3713/// getOverloadedOperator - Which C++ overloaded operator this
3714/// function represents, if any.
3715OverloadedOperatorKind FunctionDecl::getOverloadedOperator() const {
3716 if (getDeclName().getNameKind() == DeclarationName::CXXOperatorName)
3717 return getDeclName().getCXXOverloadedOperator();
3718 return OO_None;
3719}
3720
3721/// getLiteralIdentifier - The literal suffix identifier this function
3722/// represents, if any.
3723const IdentifierInfo *FunctionDecl::getLiteralIdentifier() const {
3724 if (getDeclName().getNameKind() == DeclarationName::CXXLiteralOperatorName)
3725 return getDeclName().getCXXLiteralIdentifier();
3726 return nullptr;
3727}
3728
3729FunctionDecl::TemplatedKind FunctionDecl::getTemplatedKind() const {
3730 if (TemplateOrSpecialization.isNull())
3731 return TK_NonTemplate;
3732 if (TemplateOrSpecialization.is<FunctionTemplateDecl *>())
3733 return TK_FunctionTemplate;
3734 if (TemplateOrSpecialization.is<MemberSpecializationInfo *>())
3735 return TK_MemberSpecialization;
3736 if (TemplateOrSpecialization.is<FunctionTemplateSpecializationInfo *>())
3737 return TK_FunctionTemplateSpecialization;
3738 if (TemplateOrSpecialization.is
3739 <DependentFunctionTemplateSpecializationInfo*>())
3740 return TK_DependentFunctionTemplateSpecialization;
3741
3742 llvm_unreachable("Did we miss a TemplateOrSpecialization type?")::llvm::llvm_unreachable_internal("Did we miss a TemplateOrSpecialization type?"
, "clang/lib/AST/Decl.cpp", 3742)
;
3743}
3744
3745FunctionDecl *FunctionDecl::getInstantiatedFromMemberFunction() const {
3746 if (MemberSpecializationInfo *Info = getMemberSpecializationInfo())
3747 return cast<FunctionDecl>(Info->getInstantiatedFrom());
3748
3749 return nullptr;
3750}
3751
3752MemberSpecializationInfo *FunctionDecl::getMemberSpecializationInfo() const {
3753 if (auto *MSI =
3754 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
3755 return MSI;
3756 if (auto *FTSI = TemplateOrSpecialization
3757 .dyn_cast<FunctionTemplateSpecializationInfo *>())
3758 return FTSI->getMemberSpecializationInfo();
3759 return nullptr;
3760}
3761
3762void
3763FunctionDecl::setInstantiationOfMemberFunction(ASTContext &C,
3764 FunctionDecl *FD,
3765 TemplateSpecializationKind TSK) {
3766 assert(TemplateOrSpecialization.isNull() &&(static_cast <bool> (TemplateOrSpecialization.isNull() &&
"Member function is already a specialization") ? void (0) : __assert_fail
("TemplateOrSpecialization.isNull() && \"Member function is already a specialization\""
, "clang/lib/AST/Decl.cpp", 3767, __extension__ __PRETTY_FUNCTION__
))
3767 "Member function is already a specialization")(static_cast <bool> (TemplateOrSpecialization.isNull() &&
"Member function is already a specialization") ? void (0) : __assert_fail
("TemplateOrSpecialization.isNull() && \"Member function is already a specialization\""
, "clang/lib/AST/Decl.cpp", 3767, __extension__ __PRETTY_FUNCTION__
))
;
3768 MemberSpecializationInfo *Info
3769 = new (C) MemberSpecializationInfo(FD, TSK);
3770 TemplateOrSpecialization = Info;
3771}
3772
3773FunctionTemplateDecl *FunctionDecl::getDescribedFunctionTemplate() const {
3774 return TemplateOrSpecialization.dyn_cast<FunctionTemplateDecl *>();
3775}
3776
3777void FunctionDecl::setDescribedFunctionTemplate(FunctionTemplateDecl *Template) {
3778 assert(TemplateOrSpecialization.isNull() &&(static_cast <bool> (TemplateOrSpecialization.isNull() &&
"Member function is already a specialization") ? void (0) : __assert_fail
("TemplateOrSpecialization.isNull() && \"Member function is already a specialization\""
, "clang/lib/AST/Decl.cpp", 3779, __extension__ __PRETTY_FUNCTION__
))
3779 "Member function is already a specialization")(static_cast <bool> (TemplateOrSpecialization.isNull() &&
"Member function is already a specialization") ? void (0) : __assert_fail
("TemplateOrSpecialization.isNull() && \"Member function is already a specialization\""
, "clang/lib/AST/Decl.cpp", 3779, __extension__ __PRETTY_FUNCTION__
))
;
3780 TemplateOrSpecialization = Template;
3781}
3782
3783bool FunctionDecl::isImplicitlyInstantiable() const {
3784 // If the function is invalid, it can't be implicitly instantiated.
3785 if (isInvalidDecl())
3786 return false;
3787
3788 switch (getTemplateSpecializationKindForInstantiation()) {
3789 case TSK_Undeclared:
3790 case TSK_ExplicitInstantiationDefinition:
3791 case TSK_ExplicitSpecialization:
3792 return false;
3793
3794 case TSK_ImplicitInstantiation:
3795 return true;
3796
3797 case TSK_ExplicitInstantiationDeclaration:
3798 // Handled below.
3799 break;
3800 }
3801
3802 // Find the actual template from which we will instantiate.
3803 const FunctionDecl *PatternDecl = getTemplateInstantiationPattern();
3804 bool HasPattern = false;
3805 if (PatternDecl)
3806 HasPattern = PatternDecl->hasBody(PatternDecl);
3807
3808 // C++0x [temp.explicit]p9:
3809 // Except for inline functions, other explicit instantiation declarations
3810 // have the effect of suppressing the implicit instantiation of the entity
3811 // to which they refer.
3812 if (!HasPattern || !PatternDecl)
3813 return true;
3814
3815 return PatternDecl->isInlined();
3816}
3817
3818bool FunctionDecl::isTemplateInstantiation() const {
3819 // FIXME: Remove this, it's not clear what it means. (Which template
3820 // specialization kind?)
3821 return clang::isTemplateInstantiation(getTemplateSpecializationKind());
3822}
3823
3824FunctionDecl *
3825FunctionDecl::getTemplateInstantiationPattern(bool ForDefinition) const {
3826 // If this is a generic lambda call operator specialization, its
3827 // instantiation pattern is always its primary template's pattern
3828 // even if its primary template was instantiated from another
3829 // member template (which happens with nested generic lambdas).
3830 // Since a lambda's call operator's body is transformed eagerly,
3831 // we don't have to go hunting for a prototype definition template
3832 // (i.e. instantiated-from-member-template) to use as an instantiation
3833 // pattern.
3834
3835 if (isGenericLambdaCallOperatorSpecialization(
3836 dyn_cast<CXXMethodDecl>(this))) {
3837 assert(getPrimaryTemplate() && "not a generic lambda call operator?")(static_cast <bool> (getPrimaryTemplate() && "not a generic lambda call operator?"
) ? void (0) : __assert_fail ("getPrimaryTemplate() && \"not a generic lambda call operator?\""
, "clang/lib/AST/Decl.cpp", 3837, __extension__ __PRETTY_FUNCTION__
))
;
3838 return getDefinitionOrSelf(getPrimaryTemplate()->getTemplatedDecl());
3839 }
3840
3841 // Check for a declaration of this function that was instantiated from a
3842 // friend definition.
3843 const FunctionDecl *FD = nullptr;
3844 if (!isDefined(FD, /*CheckForPendingFriendDefinition=*/true))
3845 FD = this;
3846
3847 if (MemberSpecializationInfo *Info = FD->getMemberSpecializationInfo()) {
3848 if (ForDefinition &&
3849 !clang::isTemplateInstantiation(Info->getTemplateSpecializationKind()))
3850 return nullptr;
3851 return getDefinitionOrSelf(cast<FunctionDecl>(Info->getInstantiatedFrom()));
3852 }
3853
3854 if (ForDefinition &&
3855 !clang::isTemplateInstantiation(getTemplateSpecializationKind()))
3856 return nullptr;
3857
3858 if (FunctionTemplateDecl *Primary = getPrimaryTemplate()) {
3859 // If we hit a point where the user provided a specialization of this
3860 // template, we're done looking.
3861 while (!ForDefinition || !Primary->isMemberSpecialization()) {
3862 auto *NewPrimary = Primary->getInstantiatedFromMemberTemplate();
3863 if (!NewPrimary)
3864 break;
3865 Primary = NewPrimary;
3866 }
3867
3868 return getDefinitionOrSelf(Primary->getTemplatedDecl());
3869 }
3870
3871 return nullptr;
3872}
3873
3874FunctionTemplateDecl *FunctionDecl::getPrimaryTemplate() const {
3875 if (FunctionTemplateSpecializationInfo *Info
3876 = TemplateOrSpecialization
3877 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3878 return Info->getTemplate();
3879 }
3880 return nullptr;
3881}
3882
3883FunctionTemplateSpecializationInfo *
3884FunctionDecl::getTemplateSpecializationInfo() const {
3885 return TemplateOrSpecialization
3886 .dyn_cast<FunctionTemplateSpecializationInfo *>();
3887}
3888
3889const TemplateArgumentList *
3890FunctionDecl::getTemplateSpecializationArgs() const {
3891 if (FunctionTemplateSpecializationInfo *Info
3892 = TemplateOrSpecialization
3893 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3894 return Info->TemplateArguments;
3895 }
3896 return nullptr;
3897}
3898
3899const ASTTemplateArgumentListInfo *
3900FunctionDecl::getTemplateSpecializationArgsAsWritten() const {
3901 if (FunctionTemplateSpecializationInfo *Info
3902 = TemplateOrSpecialization
3903 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3904 return Info->TemplateArgumentsAsWritten;
3905 }
3906 return nullptr;
3907}
3908
3909void
3910FunctionDecl::setFunctionTemplateSpecialization(ASTContext &C,
3911 FunctionTemplateDecl *Template,
3912 const TemplateArgumentList *TemplateArgs,
3913 void *InsertPos,
3914 TemplateSpecializationKind TSK,
3915 const TemplateArgumentListInfo *TemplateArgsAsWritten,
3916 SourceLocation PointOfInstantiation) {
3917 assert((TemplateOrSpecialization.isNull() ||(static_cast <bool> ((TemplateOrSpecialization.isNull()
|| TemplateOrSpecialization.is<MemberSpecializationInfo *
>()) && "Member function is already a specialization"
) ? void (0) : __assert_fail ("(TemplateOrSpecialization.isNull() || TemplateOrSpecialization.is<MemberSpecializationInfo *>()) && \"Member function is already a specialization\""
, "clang/lib/AST/Decl.cpp", 3919, __extension__ __PRETTY_FUNCTION__
))
3918 TemplateOrSpecialization.is<MemberSpecializationInfo *>()) &&(static_cast <bool> ((TemplateOrSpecialization.isNull()
|| TemplateOrSpecialization.is<MemberSpecializationInfo *
>()) && "Member function is already a specialization"
) ? void (0) : __assert_fail ("(TemplateOrSpecialization.isNull() || TemplateOrSpecialization.is<MemberSpecializationInfo *>()) && \"Member function is already a specialization\""
, "clang/lib/AST/Decl.cpp", 3919, __extension__ __PRETTY_FUNCTION__
))
3919 "Member function is already a specialization")(static_cast <bool> ((TemplateOrSpecialization.isNull()
|| TemplateOrSpecialization.is<MemberSpecializationInfo *
>()) && "Member function is already a specialization"
) ? void (0) : __assert_fail ("(TemplateOrSpecialization.isNull() || TemplateOrSpecialization.is<MemberSpecializationInfo *>()) && \"Member function is already a specialization\""
, "clang/lib/AST/Decl.cpp", 3919, __extension__ __PRETTY_FUNCTION__
))
;
3920 assert(TSK != TSK_Undeclared &&(static_cast <bool> (TSK != TSK_Undeclared && "Must specify the type of function template specialization"
) ? void (0) : __assert_fail ("TSK != TSK_Undeclared && \"Must specify the type of function template specialization\""
, "clang/lib/AST/Decl.cpp", 3921, __extension__ __PRETTY_FUNCTION__
))
3921 "Must specify the type of function template specialization")(static_cast <bool> (TSK != TSK_Undeclared && "Must specify the type of function template specialization"
) ? void (0) : __assert_fail ("TSK != TSK_Undeclared && \"Must specify the type of function template specialization\""
, "clang/lib/AST/Decl.cpp", 3921, __extension__ __PRETTY_FUNCTION__
))
;
3922 assert((TemplateOrSpecialization.isNull() ||(static_cast <bool> ((TemplateOrSpecialization.isNull()
|| TSK == TSK_ExplicitSpecialization) && "Member specialization must be an explicit specialization"
) ? void (0) : __assert_fail ("(TemplateOrSpecialization.isNull() || TSK == TSK_ExplicitSpecialization) && \"Member specialization must be an explicit specialization\""
, "clang/lib/AST/Decl.cpp", 3924, __extension__ __PRETTY_FUNCTION__
))
3923 TSK == TSK_ExplicitSpecialization) &&(static_cast <bool> ((TemplateOrSpecialization.isNull()
|| TSK == TSK_ExplicitSpecialization) && "Member specialization must be an explicit specialization"
) ? void (0) : __assert_fail ("(TemplateOrSpecialization.isNull() || TSK == TSK_ExplicitSpecialization) && \"Member specialization must be an explicit specialization\""
, "clang/lib/AST/Decl.cpp", 3924, __extension__ __PRETTY_FUNCTION__
))
3924 "Member specialization must be an explicit specialization")(static_cast <bool> ((TemplateOrSpecialization.isNull()
|| TSK == TSK_ExplicitSpecialization) && "Member specialization must be an explicit specialization"
) ? void (0) : __assert_fail ("(TemplateOrSpecialization.isNull() || TSK == TSK_ExplicitSpecialization) && \"Member specialization must be an explicit specialization\""
, "clang/lib/AST/Decl.cpp", 3924, __extension__ __PRETTY_FUNCTION__
))
;
3925 FunctionTemplateSpecializationInfo *Info =
3926 FunctionTemplateSpecializationInfo::Create(
3927 C, this, Template, TSK, TemplateArgs, TemplateArgsAsWritten,
3928 PointOfInstantiation,
3929 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>());
3930 TemplateOrSpecialization = Info;
3931 Template->addSpecialization(Info, InsertPos);
3932}
3933
3934void
3935FunctionDecl::setDependentTemplateSpecialization(ASTContext &Context,
3936 const UnresolvedSetImpl &Templates,
3937 const TemplateArgumentListInfo &TemplateArgs) {
3938 assert(TemplateOrSpecialization.isNull())(static_cast <bool> (TemplateOrSpecialization.isNull())
? void (0) : __assert_fail ("TemplateOrSpecialization.isNull()"
, "clang/lib/AST/Decl.cpp", 3938, __extension__ __PRETTY_FUNCTION__
))
;
1
'?' condition is true
3939 DependentFunctionTemplateSpecializationInfo *Info =
3940 DependentFunctionTemplateSpecializationInfo::Create(Context, Templates,
2
Calling 'DependentFunctionTemplateSpecializationInfo::Create'
3941 TemplateArgs);
3942 TemplateOrSpecialization = Info;
3943}
3944
3945DependentFunctionTemplateSpecializationInfo *
3946FunctionDecl::getDependentSpecializationInfo() const {
3947 return TemplateOrSpecialization
3948 .dyn_cast<DependentFunctionTemplateSpecializationInfo *>();
3949}
3950
3951DependentFunctionTemplateSpecializationInfo *
3952DependentFunctionTemplateSpecializationInfo::Create(
3953 ASTContext &Context, const UnresolvedSetImpl &Ts,
3954 const TemplateArgumentListInfo &TArgs) {
3955 void *Buffer = Context.Allocate(
3956 totalSizeToAlloc<TemplateArgumentLoc, FunctionTemplateDecl *>(
3957 TArgs.size(), Ts.size()));
3958 return new (Buffer) DependentFunctionTemplateSpecializationInfo(Ts, TArgs);
3
Calling constructor for 'DependentFunctionTemplateSpecializationInfo'
3959}
3960
3961DependentFunctionTemplateSpecializationInfo::
3962DependentFunctionTemplateSpecializationInfo(const UnresolvedSetImpl &Ts,
3963 const TemplateArgumentListInfo &TArgs)
3964 : AngleLocs(TArgs.getLAngleLoc(), TArgs.getRAngleLoc()) {
3965 NumTemplates = Ts.size();
3966 NumArgs = TArgs.size();
3967
3968 FunctionTemplateDecl **TsArray = getTrailingObjects<FunctionTemplateDecl *>();
3969 for (unsigned I = 0, E = Ts.size(); I != E; ++I)
4
Assuming 'I' is equal to 'E'
5
Loop condition is false. Execution continues on line 3972
3970 TsArray[I] = cast<FunctionTemplateDecl>(Ts[I]->getUnderlyingDecl());
3971
3972 TemplateArgumentLoc *ArgsArray = getTrailingObjects<TemplateArgumentLoc>();
6
Calling 'TrailingObjects::getTrailingObjects'
15
Returning from 'TrailingObjects::getTrailingObjects'
16
'ArgsArray' initialized here
3973 for (unsigned I = 0, E = TArgs.size(); I != E; ++I)
17
Assuming 'I' is not equal to 'E'
18
Loop condition is true. Entering loop body
3974 new (&ArgsArray[I]) TemplateArgumentLoc(TArgs[I]);
19
Storage provided to placement new is only 0 bytes, whereas the allocated type requires 32 bytes
3975}
3976
3977TemplateSpecializationKind FunctionDecl::getTemplateSpecializationKind() const {
3978 // For a function template specialization, query the specialization
3979 // information object.
3980 if (FunctionTemplateSpecializationInfo *FTSInfo =
3981 TemplateOrSpecialization
3982 .dyn_cast<FunctionTemplateSpecializationInfo *>())
3983 return FTSInfo->getTemplateSpecializationKind();
3984
3985 if (MemberSpecializationInfo *MSInfo =
3986 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
3987 return MSInfo->getTemplateSpecializationKind();
3988
3989 return TSK_Undeclared;
3990}
3991
3992TemplateSpecializationKind
3993FunctionDecl::getTemplateSpecializationKindForInstantiation() const {
3994 // This is the same as getTemplateSpecializationKind(), except that for a
3995 // function that is both a function template specialization and a member
3996 // specialization, we prefer the member specialization information. Eg:
3997 //
3998 // template<typename T> struct A {
3999 // template<typename U> void f() {}
4000 // template<> void f<int>() {}
4001 // };
4002 //
4003 // For A<int>::f<int>():
4004 // * getTemplateSpecializationKind() will return TSK_ExplicitSpecialization
4005 // * getTemplateSpecializationKindForInstantiation() will return
4006 // TSK_ImplicitInstantiation
4007 //
4008 // This reflects the facts that A<int>::f<int> is an explicit specialization
4009 // of A<int>::f, and that A<int>::f<int> should be implicitly instantiated
4010 // from A::f<int> if a definition is needed.
4011 if (FunctionTemplateSpecializationInfo *FTSInfo =
4012 TemplateOrSpecialization
4013 .dyn_cast<FunctionTemplateSpecializationInfo *>()) {
4014 if (auto *MSInfo = FTSInfo->getMemberSpecializationInfo())
4015 return MSInfo->getTemplateSpecializationKind();
4016 return FTSInfo->getTemplateSpecializationKind();
4017 }
4018
4019 if (MemberSpecializationInfo *MSInfo =
4020 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
4021 return MSInfo->getTemplateSpecializationKind();
4022
4023 return TSK_Undeclared;
4024}
4025
4026void
4027FunctionDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
4028 SourceLocation PointOfInstantiation) {
4029 if (FunctionTemplateSpecializationInfo *FTSInfo
4030 = TemplateOrSpecialization.dyn_cast<
4031 FunctionTemplateSpecializationInfo*>()) {
4032 FTSInfo->setTemplateSpecializationKind(TSK);
4033 if (TSK != TSK_ExplicitSpecialization &&
4034 PointOfInstantiation.isValid() &&
4035 FTSInfo->getPointOfInstantiation().isInvalid()) {
4036 FTSInfo->setPointOfInstantiation(PointOfInstantiation);
4037 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
4038 L->InstantiationRequested(this);
4039 }
4040 } else if (MemberSpecializationInfo *MSInfo
4041 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>()) {
4042 MSInfo->setTemplateSpecializationKind(TSK);
4043 if (TSK != TSK_ExplicitSpecialization &&
4044 PointOfInstantiation.isValid() &&
4045 MSInfo->getPointOfInstantiation().isInvalid()) {
4046 MSInfo->setPointOfInstantiation(PointOfInstantiation);
4047 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
4048 L->InstantiationRequested(this);
4049 }
4050 } else
4051 llvm_unreachable("Function cannot have a template specialization kind")::llvm::llvm_unreachable_internal("Function cannot have a template specialization kind"
, "clang/lib/AST/Decl.cpp", 4051)
;
4052}
4053
4054SourceLocation FunctionDecl::getPointOfInstantiation() const {
4055 if (FunctionTemplateSpecializationInfo *FTSInfo
4056 = TemplateOrSpecialization.dyn_cast<
4057 FunctionTemplateSpecializationInfo*>())
4058 return FTSInfo->getPointOfInstantiation();
4059 if (MemberSpecializationInfo *MSInfo =
4060 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
4061 return MSInfo->getPointOfInstantiation();
4062
4063 return SourceLocation();
4064}
4065
4066bool FunctionDecl::isOutOfLine() const {
4067 if (Decl::isOutOfLine())
4068 return true;
4069
4070 // If this function was instantiated from a member function of a
4071 // class template, check whether that member function was defined out-of-line.
4072 if (FunctionDecl *FD = getInstantiatedFromMemberFunction()) {
4073 const FunctionDecl *Definition;
4074 if (FD->hasBody(Definition))
4075 return Definition->isOutOfLine();
4076 }
4077
4078 // If this function was instantiated from a function template,
4079 // check whether that function template was defined out-of-line.
4080 if (FunctionTemplateDecl *FunTmpl = getPrimaryTemplate()) {
4081 const FunctionDecl *Definition;
4082 if (FunTmpl->getTemplatedDecl()->hasBody(Definition))
4083 return Definition->isOutOfLine();
4084 }
4085
4086 return false;
4087}
4088
4089SourceRange FunctionDecl::getSourceRange() const {
4090 return SourceRange(getOuterLocStart(), EndRangeLoc);
4091}
4092
4093unsigned FunctionDecl::getMemoryFunctionKind() const {
4094 IdentifierInfo *FnInfo = getIdentifier();
4095
4096 if (!FnInfo)
4097 return 0;
4098
4099 // Builtin handling.
4100 switch (getBuiltinID()) {
4101 case Builtin::BI__builtin_memset:
4102 case Builtin::BI__builtin___memset_chk:
4103 case Builtin::BImemset:
4104 return Builtin::BImemset;
4105
4106 case Builtin::BI__builtin_memcpy:
4107 case Builtin::BI__builtin___memcpy_chk:
4108 case Builtin::BImemcpy:
4109 return Builtin::BImemcpy;
4110
4111 case Builtin::BI__builtin_mempcpy:
4112 case Builtin::BI__builtin___mempcpy_chk:
4113 case Builtin::BImempcpy:
4114 return Builtin::BImempcpy;
4115
4116 case Builtin::BI__builtin_memmove:
4117 case Builtin::BI__builtin___memmove_chk:
4118 case Builtin::BImemmove:
4119 return Builtin::BImemmove;
4120
4121// case Builtin::BIstrlcpy:
4122// case Builtin::BI__builtin___strlcpy_chk:
4123// return Builtin::BIstrlcpy;
4124
4125// case Builtin::BIstrlcat:
4126// case Builtin::BI__builtin___strlcat_chk:
4127// return Builtin::BIstrlcat;
4128
4129 case Builtin::BI__builtin_memcmp:
4130 case Builtin::BImemcmp:
4131 return Builtin::BImemcmp;
4132
4133 case Builtin::BI__builtin_bcmp:
4134 case Builtin::BIbcmp:
4135 return Builtin::BIbcmp;
4136
4137 case Builtin::BI__builtin_strncpy:
4138 case Builtin::BI__builtin___strncpy_chk:
4139 case Builtin::BIstrncpy:
4140 return Builtin::BIstrncpy;
4141
4142 case Builtin::BI__builtin_strncmp:
4143 case Builtin::BIstrncmp:
4144 return Builtin::BIstrncmp;
4145
4146 case Builtin::BI__builtin_strncasecmp:
4147 case Builtin::BIstrncasecmp:
4148 return Builtin::BIstrncasecmp;
4149
4150 case Builtin::BI__builtin_strncat:
4151 case Builtin::BI__builtin___strncat_chk:
4152 case Builtin::BIstrncat:
4153 return Builtin::BIstrncat;
4154
4155 case Builtin::BI__builtin_strndup:
4156 case Builtin::BIstrndup:
4157 return Builtin::BIstrndup;
4158
4159 case Builtin::BI__builtin_strlen:
4160 case Builtin::BIstrlen:
4161 return Builtin::BIstrlen;
4162
4163 case Builtin::BI__builtin_bzero:
4164 case Builtin::BIbzero:
4165 return Builtin::BIbzero;
4166
4167 case Builtin::BIfree:
4168 return Builtin::BIfree;
4169
4170 default:
4171 if (isExternC()) {
4172 if (FnInfo->isStr("memset"))
4173 return Builtin::BImemset;
4174 if (FnInfo->isStr("memcpy"))
4175 return Builtin::BImemcpy;
4176 if (FnInfo->isStr("mempcpy"))
4177 return Builtin::BImempcpy;
4178 if (FnInfo->isStr("memmove"))
4179 return Builtin::BImemmove;
4180 if (FnInfo->isStr("memcmp"))
4181 return Builtin::BImemcmp;
4182 if (FnInfo->isStr("bcmp"))
4183 return Builtin::BIbcmp;
4184 if (FnInfo->isStr("strncpy"))
4185 return Builtin::BIstrncpy;
4186 if (FnInfo->isStr("strncmp"))
4187 return Builtin::BIstrncmp;
4188 if (FnInfo->isStr("strncasecmp"))
4189 return Builtin::BIstrncasecmp;
4190 if (FnInfo->isStr("strncat"))
4191 return Builtin::BIstrncat;
4192 if (FnInfo->isStr("strndup"))
4193 return Builtin::BIstrndup;
4194 if (FnInfo->isStr("strlen"))
4195 return Builtin::BIstrlen;
4196 if (FnInfo->isStr("bzero"))
4197 return Builtin::BIbzero;
4198 } else if (isInStdNamespace()) {
4199 if (FnInfo->isStr("free"))
4200 return Builtin::BIfree;
4201 }
4202 break;
4203 }
4204 return 0;
4205}
4206
4207unsigned FunctionDecl::getODRHash() const {
4208 assert(hasODRHash())(static_cast <bool> (hasODRHash()) ? void (0) : __assert_fail
("hasODRHash()", "clang/lib/AST/Decl.cpp", 4208, __extension__
__PRETTY_FUNCTION__))
;
4209 return ODRHash;
4210}
4211
4212unsigned FunctionDecl::getODRHash() {
4213 if (hasODRHash())
4214 return ODRHash;
4215
4216 if (auto *FT = getInstantiatedFromMemberFunction()) {
4217 setHasODRHash(true);
4218 ODRHash = FT->getODRHash();
4219 return ODRHash;
4220 }
4221
4222 class ODRHash Hash;
4223 Hash.AddFunctionDecl(this);
4224 setHasODRHash(true);
4225 ODRHash = Hash.CalculateHash();
4226 return ODRHash;
4227}
4228
4229//===----------------------------------------------------------------------===//
4230// FieldDecl Implementation
4231//===----------------------------------------------------------------------===//
4232
4233FieldDecl *FieldDecl::Create(const ASTContext &C, DeclContext *DC,
4234 SourceLocation StartLoc, SourceLocation IdLoc,
4235 IdentifierInfo *Id, QualType T,
4236 TypeSourceInfo *TInfo, Expr *BW, bool Mutable,
4237 InClassInitStyle InitStyle) {
4238 return new (C, DC) FieldDecl(Decl::Field, DC, StartLoc, IdLoc, Id, T, TInfo,
4239 BW, Mutable, InitStyle);
4240}
4241
4242FieldDecl *FieldDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4243 return new (C, ID) FieldDecl(Field, nullptr, SourceLocation(),
4244 SourceLocation(), nullptr, QualType(), nullptr,
4245 nullptr, false, ICIS_NoInit);
4246}
4247
4248bool FieldDecl::isAnonymousStructOrUnion() const {
4249 if (!isImplicit() || getDeclName())
4250 return false;
4251
4252 if (const auto *Record = getType()->getAs<RecordType>())
4253 return Record->getDecl()->isAnonymousStructOrUnion();
4254
4255 return false;
4256}
4257
4258unsigned FieldDecl::getBitWidthValue(const ASTContext &Ctx) const {
4259 assert(isBitField() && "not a bitfield")(static_cast <bool> (isBitField() && "not a bitfield"
) ? void (0) : __assert_fail ("isBitField() && \"not a bitfield\""
, "clang/lib/AST/Decl.cpp", 4259, __extension__ __PRETTY_FUNCTION__
))
;
4260 return getBitWidth()->EvaluateKnownConstInt(Ctx).getZExtValue();
4261}
4262
4263bool FieldDecl::isZeroLengthBitField(const ASTContext &Ctx) const {
4264 return isUnnamedBitfield() && !getBitWidth()->isValueDependent() &&
4265 getBitWidthValue(Ctx) == 0;
4266}
4267
4268bool FieldDecl::isZeroSize(const ASTContext &Ctx) const {
4269 if (isZeroLengthBitField(Ctx))
4270 return true;
4271
4272 // C++2a [intro.object]p7:
4273 // An object has nonzero size if it
4274 // -- is not a potentially-overlapping subobject, or
4275 if (!hasAttr<NoUniqueAddressAttr>())
4276 return false;
4277
4278 // -- is not of class type, or
4279 const auto *RT = getType()->getAs<RecordType>();
4280 if (!RT)
4281 return false;
4282 const RecordDecl *RD = RT->getDecl()->getDefinition();
4283 if (!RD) {
4284 assert(isInvalidDecl() && "valid field has incomplete type")(static_cast <bool> (isInvalidDecl() && "valid field has incomplete type"
) ? void (0) : __assert_fail ("isInvalidDecl() && \"valid field has incomplete type\""
, "clang/lib/AST/Decl.cpp", 4284, __extension__ __PRETTY_FUNCTION__
))
;
4285 return false;
4286 }
4287
4288 // -- [has] virtual member functions or virtual base classes, or
4289 // -- has subobjects of nonzero size or bit-fields of nonzero length
4290 const auto *CXXRD = cast<CXXRecordDecl>(RD);
4291 if (!CXXRD->isEmpty())
4292 return false;
4293
4294 // Otherwise, [...] the circumstances under which the object has zero size
4295 // are implementation-defined.
4296 // FIXME: This might be Itanium ABI specific; we don't yet know what the MS
4297 // ABI will do.
4298 return true;
4299}
4300
4301unsigned FieldDecl::getFieldIndex() const {
4302 const FieldDecl *Canonical = getCanonicalDecl();
4303 if (Canonical != this)
4304 return Canonical->getFieldIndex();
4305
4306 if (CachedFieldIndex) return CachedFieldIndex - 1;
4307
4308 unsigned Index = 0;
4309 const RecordDecl *RD = getParent()->getDefinition();
4310 assert(RD && "requested index for field of struct with no definition")(static_cast <bool> (RD && "requested index for field of struct with no definition"
) ? void (0) : __assert_fail ("RD && \"requested index for field of struct with no definition\""
, "clang/lib/AST/Decl.cpp", 4310, __extension__ __PRETTY_FUNCTION__
))
;
4311
4312 for (auto *Field : RD->fields()) {
4313 Field->getCanonicalDecl()->CachedFieldIndex = Index + 1;
4314 ++Index;
4315 }
4316
4317 assert(CachedFieldIndex && "failed to find field in parent")(static_cast <bool> (CachedFieldIndex && "failed to find field in parent"
) ? void (0) : __assert_fail ("CachedFieldIndex && \"failed to find field in parent\""
, "clang/lib/AST/Decl.cpp", 4317, __extension__ __PRETTY_FUNCTION__
))
;
4318 return CachedFieldIndex - 1;
4319}
4320
4321SourceRange FieldDecl::getSourceRange() const {
4322 const Expr *FinalExpr = getInClassInitializer();
4323 if (!FinalExpr)
4324 FinalExpr = getBitWidth();
4325 if (FinalExpr)
4326 return SourceRange(getInnerLocStart(), FinalExpr->getEndLoc());
4327 return DeclaratorDecl::getSourceRange();
4328}
4329
4330void FieldDecl::setCapturedVLAType(const VariableArrayType *VLAType) {
4331 assert((getParent()->isLambda() || getParent()->isCapturedRecord()) &&(static_cast <bool> ((getParent()->isLambda() || getParent
()->isCapturedRecord()) && "capturing type in non-lambda or captured record."
) ? void (0) : __assert_fail ("(getParent()->isLambda() || getParent()->isCapturedRecord()) && \"capturing type in non-lambda or captured record.\""
, "clang/lib/AST/Decl.cpp", 4332, __extension__ __PRETTY_FUNCTION__
))
4332 "capturing type in non-lambda or captured record.")(static_cast <bool> ((getParent()->isLambda() || getParent
()->isCapturedRecord()) && "capturing type in non-lambda or captured record."
) ? void (0) : __assert_fail ("(getParent()->isLambda() || getParent()->isCapturedRecord()) && \"capturing type in non-lambda or captured record.\""
, "clang/lib/AST/Decl.cpp", 4332, __extension__ __PRETTY_FUNCTION__
))
;
4333 assert(InitStorage.getInt() == ISK_NoInit &&(static_cast <bool> (InitStorage.getInt() == ISK_NoInit
&& InitStorage.getPointer() == nullptr && "bit width, initializer or captured type already set"
) ? void (0) : __assert_fail ("InitStorage.getInt() == ISK_NoInit && InitStorage.getPointer() == nullptr && \"bit width, initializer or captured type already set\""
, "clang/lib/AST/Decl.cpp", 4335, __extension__ __PRETTY_FUNCTION__
))
4334 InitStorage.getPointer() == nullptr &&(static_cast <bool> (InitStorage.getInt() == ISK_NoInit
&& InitStorage.getPointer() == nullptr && "bit width, initializer or captured type already set"
) ? void (0) : __assert_fail ("InitStorage.getInt() == ISK_NoInit && InitStorage.getPointer() == nullptr && \"bit width, initializer or captured type already set\""
, "clang/lib/AST/Decl.cpp", 4335, __extension__ __PRETTY_FUNCTION__
))
4335 "bit width, initializer or captured type already set")(static_cast <bool> (InitStorage.getInt() == ISK_NoInit
&& InitStorage.getPointer() == nullptr && "bit width, initializer or captured type already set"
) ? void (0) : __assert_fail ("InitStorage.getInt() == ISK_NoInit && InitStorage.getPointer() == nullptr && \"bit width, initializer or captured type already set\""
, "clang/lib/AST/Decl.cpp", 4335, __extension__ __PRETTY_FUNCTION__
))
;
4336 InitStorage.setPointerAndInt(const_cast<VariableArrayType *>(VLAType),
4337 ISK_CapturedVLAType);
4338}
4339
4340//===----------------------------------------------------------------------===//
4341// TagDecl Implementation
4342//===----------------------------------------------------------------------===//
4343
4344TagDecl::TagDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC,
4345 SourceLocation L, IdentifierInfo *Id, TagDecl *PrevDecl,
4346 SourceLocation StartL)
4347 : TypeDecl(DK, DC, L, Id, StartL), DeclContext(DK), redeclarable_base(C),
4348 TypedefNameDeclOrQualifier((TypedefNameDecl *)nullptr) {
4349 assert((DK != Enum || TK == TTK_Enum) &&(static_cast <bool> ((DK != Enum || TK == TTK_Enum) &&
"EnumDecl not matched with TTK_Enum") ? void (0) : __assert_fail
("(DK != Enum || TK == TTK_Enum) && \"EnumDecl not matched with TTK_Enum\""
, "clang/lib/AST/Decl.cpp", 4350, __extension__ __PRETTY_FUNCTION__
))
4350 "EnumDecl not matched with TTK_Enum")(static_cast <bool> ((DK != Enum || TK == TTK_Enum) &&
"EnumDecl not matched with TTK_Enum") ? void (0) : __assert_fail
("(DK != Enum || TK == TTK_Enum) && \"EnumDecl not matched with TTK_Enum\""
, "clang/lib/AST/Decl.cpp", 4350, __extension__ __PRETTY_FUNCTION__
))
;
4351 setPreviousDecl(PrevDecl);
4352 setTagKind(TK);
4353 setCompleteDefinition(false);
4354 setBeingDefined(false);
4355 setEmbeddedInDeclarator(false);
4356 setFreeStanding(false);
4357 setCompleteDefinitionRequired(false);
4358 TagDeclBits.IsThisDeclarationADemotedDefinition = false;
4359}
4360
4361SourceLocation TagDecl::getOuterLocStart() const {
4362 return getTemplateOrInnerLocStart(this);
4363}
4364
4365SourceRange TagDecl::getSourceRange() const {
4366 SourceLocation RBraceLoc = BraceRange.getEnd();
4367 SourceLocation E = RBraceLoc.isValid() ? RBraceLoc : getLocation();
4368 return SourceRange(getOuterLocStart(), E);
4369}
4370
4371TagDecl *TagDecl::getCanonicalDecl() { return getFirstDecl(); }
4372
4373void TagDecl::setTypedefNameForAnonDecl(TypedefNameDecl *TDD) {
4374 TypedefNameDeclOrQualifier = TDD;
4375 if (const Type *T = getTypeForDecl()) {
4376 (void)T;
4377 assert(T->isLinkageValid())(static_cast <bool> (T->isLinkageValid()) ? void (0)
: __assert_fail ("T->isLinkageValid()", "clang/lib/AST/Decl.cpp"
, 4377, __extension__ __PRETTY_FUNCTION__))
;
4378 }
4379 assert(isLinkageValid())(static_cast <bool> (isLinkageValid()) ? void (0) : __assert_fail
("isLinkageValid()", "clang/lib/AST/Decl.cpp", 4379, __extension__
__PRETTY_FUNCTION__))
;
4380}
4381
4382void TagDecl::startDefinition() {
4383 setBeingDefined(true);
4384
4385 if (auto *D = dyn_cast<CXXRecordDecl>(this)) {
4386 struct CXXRecordDecl::DefinitionData *Data =
4387 new (getASTContext()) struct CXXRecordDecl::DefinitionData(D);
4388 for (auto I : redecls())
4389 cast<CXXRecordDecl>(I)->DefinitionData = Data;
4390 }
4391}
4392
4393void TagDecl::completeDefinition() {
4394 assert((!isa<CXXRecordDecl>(this) ||(static_cast <bool> ((!isa<CXXRecordDecl>(this) ||
cast<CXXRecordDecl>(this)->hasDefinition()) &&
"definition completed but not started") ? void (0) : __assert_fail
("(!isa<CXXRecordDecl>(this) || cast<CXXRecordDecl>(this)->hasDefinition()) && \"definition completed but not started\""
, "clang/lib/AST/Decl.cpp", 4396, __extension__ __PRETTY_FUNCTION__
))
4395 cast<CXXRecordDecl>(this)->hasDefinition()) &&(static_cast <bool> ((!isa<CXXRecordDecl>(this) ||
cast<CXXRecordDecl>(this)->hasDefinition()) &&
"definition completed but not started") ? void (0) : __assert_fail
("(!isa<CXXRecordDecl>(this) || cast<CXXRecordDecl>(this)->hasDefinition()) && \"definition completed but not started\""
, "clang/lib/AST/Decl.cpp", 4396, __extension__ __PRETTY_FUNCTION__
))
4396 "definition completed but not started")(static_cast <bool> ((!isa<CXXRecordDecl>(this) ||
cast<CXXRecordDecl>(this)->hasDefinition()) &&
"definition completed but not started") ? void (0) : __assert_fail
("(!isa<CXXRecordDecl>(this) || cast<CXXRecordDecl>(this)->hasDefinition()) && \"definition completed but not started\""
, "clang/lib/AST/Decl.cpp", 4396, __extension__ __PRETTY_FUNCTION__
))
;
4397
4398 setCompleteDefinition(true);
4399 setBeingDefined(false);
4400
4401 if (ASTMutationListener *L = getASTMutationListener())
4402 L->CompletedTagDefinition(this);
4403}
4404
4405TagDecl *TagDecl::getDefinition() const {
4406 if (isCompleteDefinition())
4407 return const_cast<TagDecl *>(this);
4408
4409 // If it's possible for us to have an out-of-date definition, check now.
4410 if (mayHaveOutOfDateDef()) {
4411 if (IdentifierInfo *II = getIdentifier()) {
4412 if (II->isOutOfDate()) {
4413 updateOutOfDate(*II);
4414 }
4415 }
4416 }
4417
4418 if (const auto *CXXRD = dyn_cast<CXXRecordDecl>(this))
4419 return CXXRD->getDefinition();
4420
4421 for (auto R : redecls())
4422 if (R->isCompleteDefinition())
4423 return R;
4424
4425 return nullptr;
4426}
4427
4428void TagDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
4429 if (QualifierLoc) {
4430 // Make sure the extended qualifier info is allocated.
4431 if (!hasExtInfo())
4432 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
4433 // Set qualifier info.
4434 getExtInfo()->QualifierLoc = QualifierLoc;
4435 } else {
4436 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
4437 if (hasExtInfo()) {
4438 if (getExtInfo()->NumTemplParamLists == 0) {
4439 getASTContext().Deallocate(getExtInfo());
4440 TypedefNameDeclOrQualifier = (TypedefNameDecl *)nullptr;
4441 }
4442 else
4443 getExtInfo()->QualifierLoc = QualifierLoc;
4444 }
4445 }
4446}
4447
4448void TagDecl::setTemplateParameterListsInfo(
4449 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
4450 assert(!TPLists.empty())(static_cast <bool> (!TPLists.empty()) ? void (0) : __assert_fail
("!TPLists.empty()", "clang/lib/AST/Decl.cpp", 4450, __extension__
__PRETTY_FUNCTION__))
;
4451 // Make sure the extended decl info is allocated.
4452 if (!hasExtInfo())
4453 // Allocate external info struct.
4454 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
4455 // Set the template parameter lists info.
4456 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
4457}
4458
4459//===----------------------------------------------------------------------===//
4460// EnumDecl Implementation
4461//===----------------------------------------------------------------------===//
4462
4463EnumDecl::EnumDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
4464 SourceLocation IdLoc, IdentifierInfo *Id, EnumDecl *PrevDecl,
4465 bool Scoped, bool ScopedUsingClassTag, bool Fixed)
4466 : TagDecl(Enum, TTK_Enum, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
4467 assert(Scoped || !ScopedUsingClassTag)(static_cast <bool> (Scoped || !ScopedUsingClassTag) ? void
(0) : __assert_fail ("Scoped || !ScopedUsingClassTag", "clang/lib/AST/Decl.cpp"
, 4467, __extension__ __PRETTY_FUNCTION__))
;
4468 IntegerType = nullptr;
4469 setNumPositiveBits(0);
4470 setNumNegativeBits(0);
4471 setScoped(Scoped);
4472 setScopedUsingClassTag(ScopedUsingClassTag);
4473 setFixed(Fixed);
4474 setHasODRHash(false);
4475 ODRHash = 0;
4476}
4477
4478void EnumDecl::anchor() {}
4479
4480EnumDecl *EnumDecl::Create(ASTContext &C, DeclContext *DC,
4481 SourceLocation StartLoc, SourceLocation IdLoc,
4482 IdentifierInfo *Id,
4483 EnumDecl *PrevDecl, bool IsScoped,
4484 bool IsScopedUsingClassTag, bool IsFixed) {
4485 auto *Enum = new (C, DC) EnumDecl(C, DC, StartLoc, IdLoc, Id, PrevDecl,
4486 IsScoped, IsScopedUsingClassTag, IsFixed);
4487 Enum->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4488 C.getTypeDeclType(Enum, PrevDecl);
4489 return Enum;
4490}
4491
4492EnumDecl *EnumDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4493 EnumDecl *Enum =
4494 new (C, ID) EnumDecl(C, nullptr, SourceLocation(), SourceLocation(),
4495 nullptr, nullptr, false, false, false);
4496 Enum->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4497 return Enum;
4498}
4499
4500SourceRange EnumDecl::getIntegerTypeRange() const {
4501 if (const TypeSourceInfo *TI = getIntegerTypeSourceInfo())
4502 return TI->getTypeLoc().getSourceRange();
4503 return SourceRange();
4504}
4505
4506void EnumDecl::completeDefinition(QualType NewType,
4507 QualType NewPromotionType,
4508 unsigned NumPositiveBits,
4509 unsigned NumNegativeBits) {
4510 assert(!isCompleteDefinition() && "Cannot redefine enums!")(static_cast <bool> (!isCompleteDefinition() &&
"Cannot redefine enums!") ? void (0) : __assert_fail ("!isCompleteDefinition() && \"Cannot redefine enums!\""
, "clang/lib/AST/Decl.cpp", 4510, __extension__ __PRETTY_FUNCTION__
))
;
4511 if (!IntegerType)
4512 IntegerType = NewType.getTypePtr();
4513 PromotionType = NewPromotionType;
4514 setNumPositiveBits(NumPositiveBits);
4515 setNumNegativeBits(NumNegativeBits);
4516 TagDecl::completeDefinition();
4517}
4518
4519bool EnumDecl::isClosed() const {
4520 if (const auto *A = getAttr<EnumExtensibilityAttr>())
4521 return A->getExtensibility() == EnumExtensibilityAttr::Closed;
4522 return true;
4523}
4524
4525bool EnumDecl::isClosedFlag() const {
4526 return isClosed() && hasAttr<FlagEnumAttr>();
4527}
4528
4529bool EnumDecl::isClosedNonFlag() const {
4530 return isClosed() && !hasAttr<FlagEnumAttr>();
4531}
4532
4533TemplateSpecializationKind EnumDecl::getTemplateSpecializationKind() const {
4534 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
4535 return MSI->getTemplateSpecializationKind();
4536
4537 return TSK_Undeclared;
4538}
4539
4540void EnumDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
4541 SourceLocation PointOfInstantiation) {
4542 MemberSpecializationInfo *MSI = getMemberSpecializationInfo();
4543 assert(MSI && "Not an instantiated member enumeration?")(static_cast <bool> (MSI && "Not an instantiated member enumeration?"
) ? void (0) : __assert_fail ("MSI && \"Not an instantiated member enumeration?\""
, "clang/lib/AST/Decl.cpp", 4543, __extension__ __PRETTY_FUNCTION__
))
;
4544 MSI->setTemplateSpecializationKind(TSK);
4545 if (TSK != TSK_ExplicitSpecialization &&
4546 PointOfInstantiation.isValid() &&
4547 MSI->getPointOfInstantiation().isInvalid())
4548 MSI->setPointOfInstantiation(PointOfInstantiation);
4549}
4550
4551EnumDecl *EnumDecl::getTemplateInstantiationPattern() const {
4552 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
4553 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
4554 EnumDecl *ED = getInstantiatedFromMemberEnum();
4555 while (auto *NewED = ED->getInstantiatedFromMemberEnum())
4556 ED = NewED;
4557 return getDefinitionOrSelf(ED);
4558 }
4559 }
4560
4561 assert(!isTemplateInstantiation(getTemplateSpecializationKind()) &&(static_cast <bool> (!isTemplateInstantiation(getTemplateSpecializationKind
()) && "couldn't find pattern for enum instantiation"
) ? void (0) : __assert_fail ("!isTemplateInstantiation(getTemplateSpecializationKind()) && \"couldn't find pattern for enum instantiation\""
, "clang/lib/AST/Decl.cpp", 4562, __extension__ __PRETTY_FUNCTION__
))
4562 "couldn't find pattern for enum instantiation")(static_cast <bool> (!isTemplateInstantiation(getTemplateSpecializationKind
()) && "couldn't find pattern for enum instantiation"
) ? void (0) : __assert_fail ("!isTemplateInstantiation(getTemplateSpecializationKind()) && \"couldn't find pattern for enum instantiation\""
, "clang/lib/AST/Decl.cpp", 4562, __extension__ __PRETTY_FUNCTION__
))
;
4563 return nullptr;
4564}
4565
4566EnumDecl *EnumDecl::getInstantiatedFromMemberEnum() const {
4567 if (SpecializationInfo)
4568 return cast<EnumDecl>(SpecializationInfo->getInstantiatedFrom());
4569
4570 return nullptr;
4571}
4572
4573void EnumDecl::setInstantiationOfMemberEnum(ASTContext &C, EnumDecl *ED,
4574 TemplateSpecializationKind TSK) {
4575 assert(!SpecializationInfo && "Member enum is already a specialization")(static_cast <bool> (!SpecializationInfo && "Member enum is already a specialization"
) ? void (0) : __assert_fail ("!SpecializationInfo && \"Member enum is already a specialization\""
, "clang/lib/AST/Decl.cpp", 4575, __extension__ __PRETTY_FUNCTION__
))
;
4576 SpecializationInfo = new (C) MemberSpecializationInfo(ED, TSK);
4577}
4578
4579unsigned EnumDecl::getODRHash() {
4580 if (hasODRHash())
4581 return ODRHash;
4582
4583 class ODRHash Hash;
4584 Hash.AddEnumDecl(this);
4585 setHasODRHash(true);
4586 ODRHash = Hash.CalculateHash();
4587 return ODRHash;
4588}
4589
4590SourceRange EnumDecl::getSourceRange() const {
4591 auto Res = TagDecl::getSourceRange();
4592 // Set end-point to enum-base, e.g. enum foo : ^bar
4593 if (auto *TSI = getIntegerTypeSourceInfo()) {
4594 // TagDecl doesn't know about the enum base.
4595 if (!getBraceRange().getEnd().isValid())
4596 Res.setEnd(TSI->getTypeLoc().getEndLoc());
4597 }
4598 return Res;
4599}
4600
4601//===----------------------------------------------------------------------===//
4602// RecordDecl Implementation
4603//===----------------------------------------------------------------------===//
4604
4605RecordDecl::RecordDecl(Kind DK, TagKind TK, const ASTContext &C,
4606 DeclContext *DC, SourceLocation StartLoc,
4607 SourceLocation IdLoc, IdentifierInfo *Id,
4608 RecordDecl *PrevDecl)
4609 : TagDecl(DK, TK, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
4610 assert(classof(static_cast<Decl *>(this)) && "Invalid Kind!")(static_cast <bool> (classof(static_cast<Decl *>(
this)) && "Invalid Kind!") ? void (0) : __assert_fail
("classof(static_cast<Decl *>(this)) && \"Invalid Kind!\""
, "clang/lib/AST/Decl.cpp", 4610, __extension__ __PRETTY_FUNCTION__
))
;
4611 setHasFlexibleArrayMember(false);
4612 setAnonymousStructOrUnion(false);
4613 setHasObjectMember(false);
4614 setHasVolatileMember(false);
4615 setHasLoadedFieldsFromExternalStorage(false);
4616 setNonTrivialToPrimitiveDefaultInitialize(false);
4617 setNonTrivialToPrimitiveCopy(false);
4618 setNonTrivialToPrimitiveDestroy(false);
4619 setHasNonTrivialToPrimitiveDefaultInitializeCUnion(false);
4620 setHasNonTrivialToPrimitiveDestructCUnion(false);
4621 setHasNonTrivialToPrimitiveCopyCUnion(false);
4622 setParamDestroyedInCallee(false);
4623 setArgPassingRestrictions(APK_CanPassInRegs);
4624 setIsRandomized(false);
4625}
4626
4627RecordDecl *RecordDecl::Create(const ASTContext &C, TagKind TK, DeclContext *DC,
4628 SourceLocation StartLoc, SourceLocation IdLoc,
4629 IdentifierInfo *Id, RecordDecl* PrevDecl) {
4630 RecordDecl *R = new (C, DC) RecordDecl(Record, TK, C, DC,
4631 StartLoc, IdLoc, Id, PrevDecl);
4632 R->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4633
4634 C.getTypeDeclType(R, PrevDecl);
4635 return R;
4636}
4637
4638RecordDecl *RecordDecl::CreateDeserialized(const ASTContext &C, unsigned ID) {
4639 RecordDecl *R =
4640 new (C, ID) RecordDecl(Record, TTK_Struct, C, nullptr, SourceLocation(),
4641 SourceLocation(), nullptr, nullptr);
4642 R->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4643 return R;
4644}
4645
4646bool RecordDecl::isInjectedClassName() const {
4647 return isImplicit() && getDeclName() && getDeclContext()->isRecord() &&
4648 cast<RecordDecl>(getDeclContext())->getDeclName() == getDeclName();
4649}
4650
4651bool RecordDecl::isLambda() const {
4652 if (auto RD = dyn_cast<CXXRecordDecl>(this))
4653 return RD->isLambda();
4654 return false;
4655}
4656
4657bool RecordDecl::isCapturedRecord() const {
4658 return hasAttr<CapturedRecordAttr>();
4659}
4660
4661void RecordDecl::setCapturedRecord() {
4662 addAttr(CapturedRecordAttr::CreateImplicit(getASTContext()));
4663}
4664
4665bool RecordDecl::isOrContainsUnion() const {
4666 if (isUnion())
4667 return true;
4668
4669 if (const RecordDecl *Def = getDefinition()) {
4670 for (const FieldDecl *FD : Def->fields()) {
4671 const RecordType *RT = FD->getType()->getAs<RecordType>();
4672 if (RT && RT->getDecl()->isOrContainsUnion())
4673 return true;
4674 }
4675 }
4676
4677 return false;
4678}
4679
4680RecordDecl::field_iterator RecordDecl::field_begin() const {
4681 if (hasExternalLexicalStorage() && !hasLoadedFieldsFromExternalStorage())
4682 LoadFieldsFromExternalStorage();
4683
4684 return field_iterator(decl_iterator(FirstDecl));
4685}
4686
4687/// completeDefinition - Notes that the definition of this type is now
4688/// complete.
4689void RecordDecl::completeDefinition() {
4690 assert(!isCompleteDefinition() && "Cannot redefine record!")(static_cast <bool> (!isCompleteDefinition() &&
"Cannot redefine record!") ? void (0) : __assert_fail ("!isCompleteDefinition() && \"Cannot redefine record!\""
, "clang/lib/AST/Decl.cpp", 4690, __extension__ __PRETTY_FUNCTION__
))
;
4691 TagDecl::completeDefinition();
4692
4693 ASTContext &Ctx = getASTContext();
4694
4695 // Layouts are dumped when computed, so if we are dumping for all complete
4696 // types, we need to force usage to get types that wouldn't be used elsewhere.
4697 if (Ctx.getLangOpts().DumpRecordLayoutsComplete)
4698 (void)Ctx.getASTRecordLayout(this);
4699}
4700
4701/// isMsStruct - Get whether or not this record uses ms_struct layout.
4702/// This which can be turned on with an attribute, pragma, or the
4703/// -mms-bitfields command-line option.
4704bool RecordDecl::isMsStruct(const ASTContext &C) const {
4705 return hasAttr<MSStructAttr>() || C.getLangOpts().MSBitfields == 1;
4706}
4707
4708void RecordDecl::reorderFields(const SmallVectorImpl<Decl *> &Fields) {
4709 std::tie(FirstDecl, LastDecl) = DeclContext::BuildDeclChain(Fields, false);
4710 LastDecl->NextInContextAndBits.setPointer(nullptr);
4711 setIsRandomized(true);
4712}
4713
4714void RecordDecl::LoadFieldsFromExternalStorage() const {
4715 ExternalASTSource *Source = getASTContext().getExternalSource();
4716 assert(hasExternalLexicalStorage() && Source && "No external storage?")(static_cast <bool> (hasExternalLexicalStorage() &&
Source && "No external storage?") ? void (0) : __assert_fail
("hasExternalLexicalStorage() && Source && \"No external storage?\""
, "clang/lib/AST/Decl.cpp", 4716, __extension__ __PRETTY_FUNCTION__
))
;
4717
4718 // Notify that we have a RecordDecl doing some initialization.
4719 ExternalASTSource::Deserializing TheFields(Source);
4720
4721 SmallVector<Decl*, 64> Decls;
4722 setHasLoadedFieldsFromExternalStorage(true);
4723 Source->FindExternalLexicalDecls(this, [](Decl::Kind K) {
4724 return FieldDecl::classofKind(K) || IndirectFieldDecl::classofKind(K);
4725 }, Decls);
4726
4727#ifndef NDEBUG
4728 // Check that all decls we got were FieldDecls.
4729 for (unsigned i=0, e=Decls.size(); i != e; ++i)
4730 assert(isa<FieldDecl>(Decls[i]) || isa<IndirectFieldDecl>(Decls[i]))(static_cast <bool> (isa<FieldDecl>(Decls[i]) || isa
<IndirectFieldDecl>(Decls[i])) ? void (0) : __assert_fail
("isa<FieldDecl>(Decls[i]) || isa<IndirectFieldDecl>(Decls[i])"
, "clang/lib/AST/Decl.cpp", 4730, __extension__ __PRETTY_FUNCTION__
))
;
4731#endif
4732
4733 if (Decls.empty())
4734 return;
4735
4736 std::tie(FirstDecl, LastDecl) = BuildDeclChain(Decls,
4737 /*FieldsAlreadyLoaded=*/false);
4738}
4739
4740bool RecordDecl::mayInsertExtraPadding(bool EmitRemark) const {
4741 ASTContext &Context = getASTContext();
4742 const SanitizerMask EnabledAsanMask = Context.getLangOpts().Sanitize.Mask &
4743 (SanitizerKind::Address | SanitizerKind::KernelAddress);
4744 if (!EnabledAsanMask || !Context.getLangOpts().SanitizeAddressFieldPadding)
4745 return false;
4746 const auto &NoSanitizeList = Context.getNoSanitizeList();
4747 const auto *CXXRD = dyn_cast<CXXRecordDecl>(this);
4748 // We may be able to relax some of these requirements.
4749 int ReasonToReject = -1;
4750 if (!CXXRD || CXXRD->isExternCContext())
4751 ReasonToReject = 0; // is not C++.
4752 else if (CXXRD->hasAttr<PackedAttr>())
4753 ReasonToReject = 1; // is packed.
4754 else if (CXXRD->isUnion())
4755 ReasonToReject = 2; // is a union.
4756 else if (CXXRD->isTriviallyCopyable())
4757 ReasonToReject = 3; // is trivially copyable.
4758 else if (CXXRD->hasTrivialDestructor())
4759 ReasonToReject = 4; // has trivial destructor.
4760 else if (CXXRD->isStandardLayout())
4761 ReasonToReject = 5; // is standard layout.
4762 else if (NoSanitizeList.containsLocation(EnabledAsanMask, getLocation(),
4763 "field-padding"))
4764 ReasonToReject = 6; // is in an excluded file.
4765 else if (NoSanitizeList.containsType(
4766 EnabledAsanMask, getQualifiedNameAsString(), "field-padding"))
4767 ReasonToReject = 7; // The type is excluded.
4768
4769 if (EmitRemark) {
4770 if (ReasonToReject >= 0)
4771 Context.getDiagnostics().Report(
4772 getLocation(),
4773 diag::remark_sanitize_address_insert_extra_padding_rejected)
4774 << getQualifiedNameAsString() << ReasonToReject;
4775 else
4776 Context.getDiagnostics().Report(
4777 getLocation(),
4778 diag::remark_sanitize_address_insert_extra_padding_accepted)
4779 << getQualifiedNameAsString();
4780 }
4781 return ReasonToReject < 0;
4782}
4783
4784const FieldDecl *RecordDecl::findFirstNamedDataMember() const {
4785 for (const auto *I : fields()) {
4786 if (I->getIdentifier())
4787 return I;
4788
4789 if (const auto *RT = I->getType()->getAs<RecordType>())
4790 if (const FieldDecl *NamedDataMember =
4791 RT->getDecl()->findFirstNamedDataMember())
4792 return NamedDataMember;
4793 }
4794
4795 // We didn't find a named data member.
4796 return nullptr;
4797}
4798
4799//===----------------------------------------------------------------------===//
4800// BlockDecl Implementation
4801//===----------------------------------------------------------------------===//
4802
4803BlockDecl::BlockDecl(DeclContext *DC, SourceLocation CaretLoc)
4804 : Decl(Block, DC, CaretLoc), DeclContext(Block) {
4805 setIsVariadic(false);
4806 setCapturesCXXThis(false);
4807 setBlockMissingReturnType(true);
4808 setIsConversionFromLambda(false);
4809 setDoesNotEscape(false);
4810 setCanAvoidCopyToHeap(false);
4811}
4812
4813void BlockDecl::setParams(ArrayRef<ParmVarDecl *> NewParamInfo) {
4814 assert(!ParamInfo && "Already has param info!")(static_cast <bool> (!ParamInfo && "Already has param info!"
) ? void (0) : __assert_fail ("!ParamInfo && \"Already has param info!\""
, "clang/lib/AST/Decl.cpp", 4814, __extension__ __PRETTY_FUNCTION__
))
;
4815
4816 // Zero params -> null pointer.
4817 if (!NewParamInfo.empty()) {
4818 NumParams = NewParamInfo.size();
4819 ParamInfo = new (getASTContext()) ParmVarDecl*[NewParamInfo.size()];
4820 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
4821 }
4822}
4823
4824void BlockDecl::setCaptures(ASTContext &Context, ArrayRef<Capture> Captures,
4825 bool CapturesCXXThis) {
4826 this->setCapturesCXXThis(CapturesCXXThis);
4827 this->NumCaptures = Captures.size();
4828
4829 if (Captures.empty()) {
4830 this->Captures = nullptr;
4831 return;
4832 }
4833
4834 this->Captures = Captures.copy(Context).data();
4835}
4836
4837bool BlockDecl::capturesVariable(const VarDecl *variable) const {
4838 for (const auto &I : captures())
4839 // Only auto vars can be captured, so no redeclaration worries.
4840 if (I.getVariable() == variable)
4841 return true;
4842
4843 return false;
4844}
4845
4846SourceRange BlockDecl::getSourceRange() const {
4847 return SourceRange(getLocation(), Body ? Body->getEndLoc() : getLocation());
4848}
4849
4850//===----------------------------------------------------------------------===//
4851// Other Decl Allocation/Deallocation Method Implementations
4852//===----------------------------------------------------------------------===//
4853
4854void TranslationUnitDecl::anchor() {}
4855
4856TranslationUnitDecl *TranslationUnitDecl::Create(ASTContext &C) {
4857 return new (C, (DeclContext *)nullptr) TranslationUnitDecl(C);
4858}
4859
4860void PragmaCommentDecl::anchor() {}
4861
4862PragmaCommentDecl *PragmaCommentDecl::Create(const ASTContext &C,
4863 TranslationUnitDecl *DC,
4864 SourceLocation CommentLoc,
4865 PragmaMSCommentKind CommentKind,
4866 StringRef Arg) {
4867 PragmaCommentDecl *PCD =
4868 new (C, DC, additionalSizeToAlloc<char>(Arg.size() + 1))
4869 PragmaCommentDecl(DC, CommentLoc, CommentKind);
4870 memcpy(PCD->getTrailingObjects<char>(), Arg.data(), Arg.size());
4871 PCD->getTrailingObjects<char>()[Arg.size()] = '\0';
4872 return PCD;
4873}
4874
4875PragmaCommentDecl *PragmaCommentDecl::CreateDeserialized(ASTContext &C,
4876 unsigned ID,
4877 unsigned ArgSize) {
4878 return new (C, ID, additionalSizeToAlloc<char>(ArgSize + 1))
4879 PragmaCommentDecl(nullptr, SourceLocation(), PCK_Unknown);
4880}
4881
4882void PragmaDetectMismatchDecl::anchor() {}
4883
4884PragmaDetectMismatchDecl *
4885PragmaDetectMismatchDecl::Create(const ASTContext &C, TranslationUnitDecl *DC,
4886 SourceLocation Loc, StringRef Name,
4887 StringRef Value) {
4888 size_t ValueStart = Name.size() + 1;
4889 PragmaDetectMismatchDecl *PDMD =
4890 new (C, DC, additionalSizeToAlloc<char>(ValueStart + Value.size() + 1))
4891 PragmaDetectMismatchDecl(DC, Loc, ValueStart);
4892 memcpy(PDMD->getTrailingObjects<char>(), Name.data(), Name.size());
4893 PDMD->getTrailingObjects<char>()[Name.size()] = '\0';
4894 memcpy(PDMD->getTrailingObjects<char>() + ValueStart, Value.data(),
4895 Value.size());
4896 PDMD->getTrailingObjects<char>()[ValueStart + Value.size()] = '\0';
4897 return PDMD;
4898}
4899
4900PragmaDetectMismatchDecl *
4901PragmaDetectMismatchDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4902 unsigned NameValueSize) {
4903 return new (C, ID, additionalSizeToAlloc<char>(NameValueSize + 1))
4904 PragmaDetectMismatchDecl(nullptr, SourceLocation(), 0);
4905}
4906
4907void ExternCContextDecl::anchor() {}
4908
4909ExternCContextDecl *ExternCContextDecl::Create(const ASTContext &C,
4910 TranslationUnitDecl *DC) {
4911 return new (C, DC) ExternCContextDecl(DC);
4912}
4913
4914void LabelDecl::anchor() {}
4915
4916LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4917 SourceLocation IdentL, IdentifierInfo *II) {
4918 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, IdentL);
4919}
4920
4921LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4922 SourceLocation IdentL, IdentifierInfo *II,
4923 SourceLocation GnuLabelL) {
4924 assert(GnuLabelL != IdentL && "Use this only for GNU local labels")(static_cast <bool> (GnuLabelL != IdentL && "Use this only for GNU local labels"
) ? void (0) : __assert_fail ("GnuLabelL != IdentL && \"Use this only for GNU local labels\""
, "clang/lib/AST/Decl.cpp", 4924, __extension__ __PRETTY_FUNCTION__
))
;
4925 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, GnuLabelL);
4926}
4927
4928LabelDecl *LabelDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4929 return new (C, ID) LabelDecl(nullptr, SourceLocation(), nullptr, nullptr,
4930 SourceLocation());
4931}
4932
4933void LabelDecl::setMSAsmLabel(StringRef Name) {
4934char *Buffer = new (getASTContext(), 1) char[Name.size() + 1];
4935 memcpy(Buffer, Name.data(), Name.size());
4936 Buffer[Name.size()] = '\0';
4937 MSAsmName = Buffer;
4938}
4939
4940void ValueDecl::anchor() {}
4941
4942bool ValueDecl::isWeak() const {
4943 auto *MostRecent = getMostRecentDecl();
4944 return MostRecent->hasAttr<WeakAttr>() ||
4945 MostRecent->hasAttr<WeakRefAttr>() || isWeakImported();
4946}
4947
4948void ImplicitParamDecl::anchor() {}
4949
4950ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, DeclContext *DC,
4951 SourceLocation IdLoc,
4952 IdentifierInfo *Id, QualType Type,
4953 ImplicitParamKind ParamKind) {
4954 return new (C, DC) ImplicitParamDecl(C, DC, IdLoc, Id, Type, ParamKind);
4955}
4956
4957ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, QualType Type,
4958 ImplicitParamKind ParamKind) {
4959 return new (C, nullptr) ImplicitParamDecl(C, Type, ParamKind);
4960}
4961
4962ImplicitParamDecl *ImplicitParamDecl::CreateDeserialized(ASTContext &C,
4963 unsigned ID) {
4964 return new (C, ID) ImplicitParamDecl(C, QualType(), ImplicitParamKind::Other);
4965}
4966
4967FunctionDecl *
4968FunctionDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
4969 const DeclarationNameInfo &NameInfo, QualType T,
4970 TypeSourceInfo *TInfo, StorageClass SC, bool UsesFPIntrin,
4971 bool isInlineSpecified, bool hasWrittenPrototype,
4972 ConstexprSpecKind ConstexprKind,
4973 Expr *TrailingRequiresClause) {
4974 FunctionDecl *New = new (C, DC) FunctionDecl(
4975 Function, C, DC, StartLoc, NameInfo, T, TInfo, SC, UsesFPIntrin,
4976 isInlineSpecified, ConstexprKind, TrailingRequiresClause);
4977 New->setHasWrittenPrototype(hasWrittenPrototype);
4978 return New;
4979}
4980
4981FunctionDecl *FunctionDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4982 return new (C, ID) FunctionDecl(
4983 Function, C, nullptr, SourceLocation(), DeclarationNameInfo(), QualType(),
4984 nullptr, SC_None, false, false, ConstexprSpecKind::Unspecified, nullptr);
4985}
4986
4987BlockDecl *BlockDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
4988 return new (C, DC) BlockDecl(DC, L);
4989}
4990
4991BlockDecl *BlockDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4992 return new (C, ID) BlockDecl(nullptr, SourceLocation());
4993}
4994
4995CapturedDecl::CapturedDecl(DeclContext *DC, unsigned NumParams)
4996 : Decl(Captured, DC, SourceLocation()), DeclContext(Captured),
4997 NumParams(NumParams), ContextParam(0), BodyAndNothrow(nullptr, false) {}
4998
4999CapturedDecl *CapturedDecl::Create(ASTContext &C, DeclContext *DC,
5000 unsigned NumParams) {
5001 return new (C, DC, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
5002 CapturedDecl(DC, NumParams);
5003}
5004
5005CapturedDecl *CapturedDecl::CreateDeserialized(ASTContext &C, unsigned ID,
5006 unsigned NumParams) {
5007 return new (C, ID, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
5008 CapturedDecl(nullptr, NumParams);
5009}
5010
5011Stmt *CapturedDecl::getBody() const { return BodyAndNothrow.getPointer(); }
5012void CapturedDecl::setBody(Stmt *B) { BodyAndNothrow.setPointer(B); }
5013
5014bool CapturedDecl::isNothrow() const { return BodyAndNothrow.getInt(); }
5015void CapturedDecl::setNothrow(bool Nothrow) { BodyAndNothrow.setInt(Nothrow); }
5016
5017EnumConstantDecl *EnumConstantDecl::Create(ASTContext &C, EnumDecl *CD,
5018 SourceLocation L,
5019 IdentifierInfo *Id, QualType T,
5020 Expr *E, const llvm::APSInt &V) {
5021 return new (C, CD) EnumConstantDecl(CD, L, Id, T, E, V);
5022}
5023
5024EnumConstantDecl *
5025EnumConstantDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
5026 return new (C, ID) EnumConstantDecl(nullptr, SourceLocation(), nullptr,
5027 QualType(), nullptr, llvm::APSInt());
5028}
5029
5030void IndirectFieldDecl::anchor() {}
5031
5032IndirectFieldDecl::IndirectFieldDecl(ASTContext &C, DeclContext *DC,
5033 SourceLocation L, DeclarationName N,
5034 QualType T,
5035 MutableArrayRef<NamedDecl *> CH)
5036 : ValueDecl(IndirectField, DC, L, N, T), Chaining(CH.data()),
5037 ChainingSize(CH.size()) {
5038 // In C++, indirect field declarations conflict with tag declarations in the
5039 // same scope, so add them to IDNS_Tag so that tag redeclaration finds them.
5040 if (C.getLangOpts().CPlusPlus)
5041 IdentifierNamespace |= IDNS_Tag;
5042}
5043
5044IndirectFieldDecl *
5045IndirectFieldDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L,
5046 IdentifierInfo *Id, QualType T,
5047 llvm::MutableArrayRef<NamedDecl *> CH) {
5048 return new (C, DC) IndirectFieldDecl(C, DC, L, Id, T, CH);
5049}
5050
5051IndirectFieldDecl *IndirectFieldDecl::CreateDeserialized(ASTContext &C,
5052 unsigned ID) {
5053 return new (C, ID) IndirectFieldDecl(C, nullptr, SourceLocation(),
5054 DeclarationName(), QualType(), None);
5055}
5056
5057SourceRange EnumConstantDecl::getSourceRange() const {
5058 SourceLocation End = getLocation();
5059 if (Init)
5060 End = Init->getEndLoc();
5061 return SourceRange(getLocation(), End);
5062}
5063
5064void TypeDecl::anchor() {}
5065
5066TypedefDecl *TypedefDecl::Create(ASTContext &C, DeclContext *DC,
5067 SourceLocation StartLoc, SourceLocation IdLoc,
5068 IdentifierInfo *Id, TypeSourceInfo *TInfo) {
5069 return new (C, DC) TypedefDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
5070}
5071
5072void TypedefNameDecl::anchor() {}
5073
5074TagDecl *TypedefNameDecl::getAnonDeclWithTypedefName(bool AnyRedecl) const {
5075 if (auto *TT = getTypeSourceInfo()->getType()->getAs<TagType>()) {
5076 auto *OwningTypedef = TT->getDecl()->getTypedefNameForAnonDecl();
5077 auto *ThisTypedef = this;
5078 if (AnyRedecl && OwningTypedef) {
5079 OwningTypedef = OwningTypedef->getCanonicalDecl();
5080 ThisTypedef = ThisTypedef->getCanonicalDecl();
5081 }
5082 if (OwningTypedef == ThisTypedef)
5083 return TT->getDecl();
5084 }
5085
5086 return nullptr;
5087}
5088
5089bool TypedefNameDecl::isTransparentTagSlow() const {
5090 auto determineIsTransparent = [&]() {
5091 if (auto *TT = getUnderlyingType()->getAs<TagType>()) {
5092 if (auto *TD = TT->getDecl()) {
5093 if (TD->getName() != getName())
5094 return false;
5095 SourceLocation TTLoc = getLocation();
5096 SourceLocation TDLoc = TD->getLocation();
5097 if (!TTLoc.isMacroID() || !TDLoc.isMacroID())
5098 return false;
5099 SourceManager &SM = getASTContext().getSourceManager();
5100 return SM.getSpellingLoc(TTLoc) == SM.getSpellingLoc(TDLoc);
5101 }
5102 }
5103 return false;
5104 };
5105
5106 bool isTransparent = determineIsTransparent();
5107 MaybeModedTInfo.setInt((isTransparent << 1) | 1);
5108 return isTransparent;
5109}
5110
5111TypedefDecl *TypedefDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
5112 return new (C, ID) TypedefDecl(C, nullptr, SourceLocation(), SourceLocation(),
5113 nullptr, nullptr);
5114}
5115
5116TypeAliasDecl *TypeAliasDecl::Create(ASTContext &C, DeclContext *DC,
5117 SourceLocation StartLoc,
5118 SourceLocation IdLoc, IdentifierInfo *Id,
5119 TypeSourceInfo *TInfo) {
5120 return new (C, DC) TypeAliasDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
5121}
5122
5123TypeAliasDecl *TypeAliasDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
5124 return new (C, ID) TypeAliasDecl(C, nullptr, SourceLocation(),
5125 SourceLocation(), nullptr, nullptr);
5126}
5127
5128SourceRange TypedefDecl::getSourceRange() const {
5129 SourceLocation RangeEnd = getLocation();
5130 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
5131 if (typeIsPostfix(TInfo->getType()))
5132 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
5133 }
5134 return SourceRange(getBeginLoc(), RangeEnd);
5135}
5136
5137SourceRange TypeAliasDecl::getSourceRange() const {
5138 SourceLocation RangeEnd = getBeginLoc();
5139 if (TypeSourceInfo *TInfo = getTypeSourceInfo())
5140 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
5141 return SourceRange(getBeginLoc(), RangeEnd);
5142}
5143
5144void FileScopeAsmDecl::anchor() {}
5145
5146FileScopeAsmDecl *FileScopeAsmDecl::Create(ASTContext &C, DeclContext *DC,
5147 StringLiteral *Str,
5148 SourceLocation AsmLoc,
5149 SourceLocation RParenLoc) {
5150 return new (C, DC) FileScopeAsmDecl(DC, Str, AsmLoc, RParenLoc);
5151}
5152
5153FileScopeAsmDecl *FileScopeAsmDecl::CreateDeserialized(ASTContext &C,
5154 unsigned ID) {
5155 return new (C, ID) FileScopeAsmDecl(nullptr, nullptr, SourceLocation(),
5156 SourceLocation());
5157}
5158
5159void EmptyDecl::anchor() {}
5160
5161EmptyDecl *EmptyDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
5162 return new (C, DC) EmptyDecl(DC, L);
5163}
5164
5165EmptyDecl *EmptyDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
5166 return new (C, ID) EmptyDecl(nullptr, SourceLocation());
5167}
5168
5169//===----------------------------------------------------------------------===//
5170// ImportDecl Implementation
5171//===----------------------------------------------------------------------===//
5172
5173/// Retrieve the number of module identifiers needed to name the given
5174/// module.
5175static unsigned getNumModuleIdentifiers(Module *Mod) {
5176 unsigned Result = 1;
5177 while (Mod->Parent) {
5178 Mod = Mod->Parent;
5179 ++Result;
5180 }
5181 return Result;
5182}
5183
5184ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
5185 Module *Imported,
5186 ArrayRef<SourceLocation> IdentifierLocs)
5187 : Decl(Import, DC, StartLoc), ImportedModule(Imported),
5188 NextLocalImportAndComplete(nullptr, true) {
5189 assert(getNumModuleIdentifiers(Imported) == IdentifierLocs.size())(static_cast <bool> (getNumModuleIdentifiers(Imported) ==
IdentifierLocs.size()) ? void (0) : __assert_fail ("getNumModuleIdentifiers(Imported) == IdentifierLocs.size()"
, "clang/lib/AST/Decl.cpp", 5189, __extension__ __PRETTY_FUNCTION__
))
;
5190 auto *StoredLocs = getTrailingObjects<SourceLocation>();
5191 std::uninitialized_copy(IdentifierLocs.begin(), IdentifierLocs.end(),
5192 StoredLocs);
5193}
5194
5195ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
5196 Module *Imported, SourceLocation EndLoc)
5197 : Decl(Import, DC, StartLoc), ImportedModule(Imported),
5198 NextLocalImportAndComplete(nullptr, false) {
5199 *getTrailingObjects<SourceLocation>() = EndLoc;
5200}
5201
5202ImportDecl *ImportDecl::Create(ASTContext &C, DeclContext *DC,
5203 SourceLocation StartLoc, Module *Imported,
5204 ArrayRef<SourceLocation> IdentifierLocs) {
5205 return new (C, DC,
5206 additionalSizeToAlloc<SourceLocation>(IdentifierLocs.size()))
5207 ImportDecl(DC, StartLoc, Imported, IdentifierLocs);
5208}
5209
5210ImportDecl *ImportDecl::CreateImplicit(ASTContext &C, DeclContext *DC,
5211 SourceLocation StartLoc,
5212 Module *Imported,
5213 SourceLocation EndLoc) {
5214 ImportDecl *Import = new (C, DC, additionalSizeToAlloc<SourceLocation>(1))
5215 ImportDecl(DC, StartLoc, Imported, EndLoc);
5216 Import->setImplicit();
5217 return Import;
5218}
5219
5220ImportDecl *ImportDecl::CreateDeserialized(ASTContext &C, unsigned ID,
5221 unsigned NumLocations) {
5222 return new (C, ID, additionalSizeToAlloc<SourceLocation>(NumLocations))
5223 ImportDecl(EmptyShell());
5224}
5225
5226ArrayRef<SourceLocation> ImportDecl::getIdentifierLocs() const {
5227 if (!isImportComplete())
5228 return None;
5229
5230 const auto *StoredLocs = getTrailingObjects<SourceLocation>();
5231 return llvm::makeArrayRef(StoredLocs,
5232 getNumModuleIdentifiers(getImportedModule()));
5233}
5234
5235SourceRange ImportDecl::getSourceRange() const {
5236 if (!isImportComplete())
5237 return SourceRange(getLocation(), *getTrailingObjects<SourceLocation>());
5238
5239 return SourceRange(getLocation(), getIdentifierLocs().back());
5240}
5241
5242//===----------------------------------------------------------------------===//
5243// ExportDecl Implementation
5244//===----------------------------------------------------------------------===//
5245
5246void ExportDecl::anchor() {}
5247
5248ExportDecl *ExportDecl::Create(ASTContext &C, DeclContext *DC,
5249 SourceLocation ExportLoc) {
5250 return new (C, DC) ExportDecl(DC, ExportLoc);
5251}
5252
5253ExportDecl *ExportDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
5254 return new (C, ID) ExportDecl(nullptr, SourceLocation());
5255}

/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/llvm/include/llvm/Support/TrailingObjects.h

1//===--- TrailingObjects.h - Variable-length classes ------------*- 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/// \file
10/// This header defines support for implementing classes that have
11/// some trailing object (or arrays of objects) appended to them. The
12/// main purpose is to make it obvious where this idiom is being used,
13/// and to make the usage more idiomatic and more difficult to get
14/// wrong.
15///
16/// The TrailingObject template abstracts away the reinterpret_cast,
17/// pointer arithmetic, and size calculations used for the allocation
18/// and access of appended arrays of objects, and takes care that they
19/// are all allocated at their required alignment. Additionally, it
20/// ensures that the base type is final -- deriving from a class that
21/// expects data appended immediately after it is typically not safe.
22///
23/// Users are expected to derive from this template, and provide
24/// numTrailingObjects implementations for each trailing type except
25/// the last, e.g. like this sample:
26///
27/// \code
28/// class VarLengthObj : private TrailingObjects<VarLengthObj, int, double> {
29/// friend TrailingObjects;
30///
31/// unsigned NumInts, NumDoubles;
32/// size_t numTrailingObjects(OverloadToken<int>) const { return NumInts; }
33/// };
34/// \endcode
35///
36/// You can access the appended arrays via 'getTrailingObjects', and
37/// determine the size needed for allocation via
38/// 'additionalSizeToAlloc' and 'totalSizeToAlloc'.
39///
40/// All the methods implemented by this class are are intended for use
41/// by the implementation of the class, not as part of its interface
42/// (thus, private inheritance is suggested).
43///
44//===----------------------------------------------------------------------===//
45
46#ifndef LLVM_SUPPORT_TRAILINGOBJECTS_H
47#define LLVM_SUPPORT_TRAILINGOBJECTS_H
48
49#include "llvm/Support/AlignOf.h"
50#include "llvm/Support/Alignment.h"
51#include "llvm/Support/Compiler.h"
52#include "llvm/Support/MathExtras.h"
53#include "llvm/Support/type_traits.h"
54#include <new>
55#include <type_traits>
56
57namespace llvm {
58
59namespace trailing_objects_internal {
60/// Helper template to calculate the max alignment requirement for a set of
61/// objects.
62template <typename First, typename... Rest> class AlignmentCalcHelper {
63private:
64 enum {
65 FirstAlignment = alignof(First),
66 RestAlignment = AlignmentCalcHelper<Rest...>::Alignment,
67 };
68
69public:
70 enum {
71 Alignment = FirstAlignment > RestAlignment ? FirstAlignment : RestAlignment
72 };
73};
74
75template <typename First> class AlignmentCalcHelper<First> {
76public:
77 enum { Alignment = alignof(First) };
78};
79
80/// The base class for TrailingObjects* classes.
81class TrailingObjectsBase {
82protected:
83 /// OverloadToken's purpose is to allow specifying function overloads
84 /// for different types, without actually taking the types as
85 /// parameters. (Necessary because member function templates cannot
86 /// be specialized, so overloads must be used instead of
87 /// specialization.)
88 template <typename T> struct OverloadToken {};
89};
90
91// Just a little helper for transforming a type pack into the same
92// number of a different type. e.g.:
93// ExtractSecondType<Foo..., int>::type
94template <typename Ty1, typename Ty2> struct ExtractSecondType {
95 typedef Ty2 type;
96};
97
98// TrailingObjectsImpl is somewhat complicated, because it is a
99// recursively inheriting template, in order to handle the template
100// varargs. Each level of inheritance picks off a single trailing type
101// then recurses on the rest. The "Align", "BaseTy", and
102// "TopTrailingObj" arguments are passed through unchanged through the
103// recursion. "PrevTy" is, at each level, the type handled by the
104// level right above it.
105
106template <int Align, typename BaseTy, typename TopTrailingObj, typename PrevTy,
107 typename... MoreTys>
108class TrailingObjectsImpl {
109 // The main template definition is never used -- the two
110 // specializations cover all possibilities.
111};
112
113template <int Align, typename BaseTy, typename TopTrailingObj, typename PrevTy,
114 typename NextTy, typename... MoreTys>
115class TrailingObjectsImpl<Align, BaseTy, TopTrailingObj, PrevTy, NextTy,
116 MoreTys...>
117 : public TrailingObjectsImpl<Align, BaseTy, TopTrailingObj, NextTy,
118 MoreTys...> {
119
120 typedef TrailingObjectsImpl<Align, BaseTy, TopTrailingObj, NextTy, MoreTys...>
121 ParentType;
122
123 struct RequiresRealignment {
124 static const bool value = alignof(PrevTy) < alignof(NextTy);
125 };
126
127 static constexpr bool requiresRealignment() {
128 return RequiresRealignment::value;
129 }
130
131protected:
132 // Ensure the inherited getTrailingObjectsImpl is not hidden.
133 using ParentType::getTrailingObjectsImpl;
134
135 // These two functions are helper functions for
136 // TrailingObjects::getTrailingObjects. They recurse to the left --
137 // the result for each type in the list of trailing types depends on
138 // the result of calling the function on the type to the
139 // left. However, the function for the type to the left is
140 // implemented by a *subclass* of this class, so we invoke it via
141 // the TopTrailingObj, which is, via the
142 // curiously-recurring-template-pattern, the most-derived type in
143 // this recursion, and thus, contains all the overloads.
144 static const NextTy *
145 getTrailingObjectsImpl(const BaseTy *Obj,
146 TrailingObjectsBase::OverloadToken<NextTy>) {
147 auto *Ptr = TopTrailingObj::getTrailingObjectsImpl(
148 Obj, TrailingObjectsBase::OverloadToken<PrevTy>()) +
149 TopTrailingObj::callNumTrailingObjects(
150 Obj, TrailingObjectsBase::OverloadToken<PrevTy>());
151
152 if (requiresRealignment())
153 return reinterpret_cast<const NextTy *>(
154 alignAddr(Ptr, Align::Of<NextTy>()));
155 else
156 return reinterpret_cast<const NextTy *>(Ptr);
157 }
158
159 static NextTy *
160 getTrailingObjectsImpl(BaseTy *Obj,
161 TrailingObjectsBase::OverloadToken<NextTy>) {
162 auto *Ptr = TopTrailingObj::getTrailingObjectsImpl(
10
'Ptr' initialized here
163 Obj, TrailingObjectsBase::OverloadToken<PrevTy>()) +
9
Passing value via 1st parameter 'Obj'
164 TopTrailingObj::callNumTrailingObjects(
165 Obj, TrailingObjectsBase::OverloadToken<PrevTy>());
166
167 if (requiresRealignment())
11
Taking false branch
168 return reinterpret_cast<NextTy *>(alignAddr(Ptr, Align::Of<NextTy>()));
169 else
170 return reinterpret_cast<NextTy *>(Ptr);
12
Returning pointer (loaded from 'Ptr')
171 }
172
173 // Helper function for TrailingObjects::additionalSizeToAlloc: this
174 // function recurses to superclasses, each of which requires one
175 // fewer size_t argument, and adds its own size.
176 static constexpr size_t additionalSizeToAllocImpl(
177 size_t SizeSoFar, size_t Count1,
178 typename ExtractSecondType<MoreTys, size_t>::type... MoreCounts) {
179 return ParentType::additionalSizeToAllocImpl(
180 (requiresRealignment() ? llvm::alignTo<alignof(NextTy)>(SizeSoFar)
181 : SizeSoFar) +
182 sizeof(NextTy) * Count1,
183 MoreCounts...);
184 }
185};
186
187// The base case of the TrailingObjectsImpl inheritance recursion,
188// when there's no more trailing types.
189template <int Align, typename BaseTy, typename TopTrailingObj, typename PrevTy>
190class alignas(Align) TrailingObjectsImpl<Align, BaseTy, TopTrailingObj, PrevTy>
191 : public TrailingObjectsBase {
192protected:
193 // This is a dummy method, only here so the "using" doesn't fail --
194 // it will never be called, because this function recurses backwards
195 // up the inheritance chain to subclasses.
196 static void getTrailingObjectsImpl();
197
198 static constexpr size_t additionalSizeToAllocImpl(size_t SizeSoFar) {
199 return SizeSoFar;
200 }
201
202 template <bool CheckAlignment> static void verifyTrailingObjectsAlignment() {}
203};
204
205} // end namespace trailing_objects_internal
206
207// Finally, the main type defined in this file, the one intended for users...
208
209/// See the file comment for details on the usage of the
210/// TrailingObjects type.
211template <typename BaseTy, typename... TrailingTys>
212class TrailingObjects : private trailing_objects_internal::TrailingObjectsImpl<
213 trailing_objects_internal::AlignmentCalcHelper<
214 TrailingTys...>::Alignment,
215 BaseTy, TrailingObjects<BaseTy, TrailingTys...>,
216 BaseTy, TrailingTys...> {
217
218 template <int A, typename B, typename T, typename P, typename... M>
219 friend class trailing_objects_internal::TrailingObjectsImpl;
220
221 template <typename... Tys> class Foo {};
222
223 typedef trailing_objects_internal::TrailingObjectsImpl<
224 trailing_objects_internal::AlignmentCalcHelper<TrailingTys...>::Alignment,
225 BaseTy, TrailingObjects<BaseTy, TrailingTys...>, BaseTy, TrailingTys...>
226 ParentType;
227 using TrailingObjectsBase = trailing_objects_internal::TrailingObjectsBase;
228
229 using ParentType::getTrailingObjectsImpl;
230
231 // This function contains only a static_assert BaseTy is final. The
232 // static_assert must be in a function, and not at class-level
233 // because BaseTy isn't complete at class instantiation time, but
234 // will be by the time this function is instantiated.
235 static void verifyTrailingObjectsAssertions() {
236 static_assert(std::is_final<BaseTy>(), "BaseTy must be final.");
237 }
238
239 // These two methods are the base of the recursion for this method.
240 static const BaseTy *
241 getTrailingObjectsImpl(const BaseTy *Obj,
242 TrailingObjectsBase::OverloadToken<BaseTy>) {
243 return Obj;
244 }
245
246 static BaseTy *
247 getTrailingObjectsImpl(BaseTy *Obj,
248 TrailingObjectsBase::OverloadToken<BaseTy>) {
249 return Obj;
250 }
251
252 // callNumTrailingObjects simply calls numTrailingObjects on the
253 // provided Obj -- except when the type being queried is BaseTy
254 // itself. There is always only one of the base object, so that case
255 // is handled here. (An additional benefit of indirecting through
256 // this function is that consumers only say "friend
257 // TrailingObjects", and thus, only this class itself can call the
258 // numTrailingObjects function.)
259 static size_t
260 callNumTrailingObjects(const BaseTy *Obj,
261 TrailingObjectsBase::OverloadToken<BaseTy>) {
262 return 1;
263 }
264
265 template <typename T>
266 static size_t callNumTrailingObjects(const BaseTy *Obj,
267 TrailingObjectsBase::OverloadToken<T>) {
268 return Obj->numTrailingObjects(TrailingObjectsBase::OverloadToken<T>());
269 }
270
271public:
272 // Make this (privately inherited) member public.
273#ifndef _MSC_VER
274 using ParentType::OverloadToken;
275#else
276 // An MSVC bug prevents the above from working, (last tested at CL version
277 // 19.28). "Class5" in TrailingObjectsTest.cpp tests the problematic case.
278 template <typename T>
279 using OverloadToken = typename ParentType::template OverloadToken<T>;
280#endif
281
282 /// Returns a pointer to the trailing object array of the given type
283 /// (which must be one of those specified in the class template). The
284 /// array may have zero or more elements in it.
285 template <typename T> const T *getTrailingObjects() const {
286 verifyTrailingObjectsAssertions();
287 // Forwards to an impl function with overloads, since member
288 // function templates can't be specialized.
289 return this->getTrailingObjectsImpl(
290 static_cast<const BaseTy *>(this),
291 TrailingObjectsBase::OverloadToken<T>());
292 }
293
294 /// Returns a pointer to the trailing object array of the given type
295 /// (which must be one of those specified in the class template). The
296 /// array may have zero or more elements in it.
297 template <typename T> T *getTrailingObjects() {
298 verifyTrailingObjectsAssertions();
299 // Forwards to an impl function with overloads, since member
300 // function templates can't be specialized.
301 return this->getTrailingObjectsImpl(
8
Calling 'TrailingObjectsImpl::getTrailingObjectsImpl'
13
Returning from 'TrailingObjectsImpl::getTrailingObjectsImpl'
14
Returning pointer
302 static_cast<BaseTy *>(this), TrailingObjectsBase::OverloadToken<T>());
7
Passing value via 1st parameter 'Obj'
303 }
304
305 /// Returns the size of the trailing data, if an object were
306 /// allocated with the given counts (The counts are in the same order
307 /// as the template arguments). This does not include the size of the
308 /// base object. The template arguments must be the same as those
309 /// used in the class; they are supplied here redundantly only so
310 /// that it's clear what the counts are counting in callers.
311 template <typename... Tys>
312 static constexpr std::enable_if_t<
313 std::is_same<Foo<TrailingTys...>, Foo<Tys...>>::value, size_t>
314 additionalSizeToAlloc(typename trailing_objects_internal::ExtractSecondType<
315 TrailingTys, size_t>::type... Counts) {
316 return ParentType::additionalSizeToAllocImpl(0, Counts...);
317 }
318
319 /// Returns the total size of an object if it were allocated with the
320 /// given trailing object counts. This is the same as
321 /// additionalSizeToAlloc, except it *does* include the size of the base
322 /// object.
323 template <typename... Tys>
324 static constexpr std::enable_if_t<
325 std::is_same<Foo<TrailingTys...>, Foo<Tys...>>::value, size_t>
326 totalSizeToAlloc(typename trailing_objects_internal::ExtractSecondType<
327 TrailingTys, size_t>::type... Counts) {
328 return sizeof(BaseTy) + ParentType::additionalSizeToAllocImpl(0, Counts...);
329 }
330
331 TrailingObjects() = default;
332 TrailingObjects(const TrailingObjects &) = delete;
333 TrailingObjects(TrailingObjects &&) = delete;
334 TrailingObjects &operator=(const TrailingObjects &) = delete;
335 TrailingObjects &operator=(TrailingObjects &&) = delete;
336
337 /// A type where its ::with_counts template member has a ::type member
338 /// suitable for use as uninitialized storage for an object with the given
339 /// trailing object counts. The template arguments are similar to those
340 /// of additionalSizeToAlloc.
341 ///
342 /// Use with FixedSizeStorageOwner, e.g.:
343 ///
344 /// \code{.cpp}
345 ///
346 /// MyObj::FixedSizeStorage<void *>::with_counts<1u>::type myStackObjStorage;
347 /// MyObj::FixedSizeStorageOwner
348 /// myStackObjOwner(new ((void *)&myStackObjStorage) MyObj);
349 /// MyObj *const myStackObjPtr = myStackObjOwner.get();
350 ///
351 /// \endcode
352 template <typename... Tys> struct FixedSizeStorage {
353 template <size_t... Counts> struct with_counts {
354 enum { Size = totalSizeToAlloc<Tys...>(Counts...) };
355 struct type {
356 alignas(BaseTy) char buffer[Size];
357 };
358 };
359 };
360
361 /// A type that acts as the owner for an object placed into fixed storage.
362 class FixedSizeStorageOwner {
363 public:
364 FixedSizeStorageOwner(BaseTy *p) : p(p) {}
365 ~FixedSizeStorageOwner() {
366 assert(p && "FixedSizeStorageOwner owns null?")(static_cast <bool> (p && "FixedSizeStorageOwner owns null?"
) ? void (0) : __assert_fail ("p && \"FixedSizeStorageOwner owns null?\""
, "llvm/include/llvm/Support/TrailingObjects.h", 366, __extension__
__PRETTY_FUNCTION__))
;
367 p->~BaseTy();
368 }
369
370 BaseTy *get() { return p; }
371 const BaseTy *get() const { return p; }
372
373 private:
374 FixedSizeStorageOwner(const FixedSizeStorageOwner &) = delete;
375 FixedSizeStorageOwner(FixedSizeStorageOwner &&) = delete;
376 FixedSizeStorageOwner &operator=(const FixedSizeStorageOwner &) = delete;
377 FixedSizeStorageOwner &operator=(FixedSizeStorageOwner &&) = delete;
378
379 BaseTy *const p;
380 };
381};
382
383} // end namespace llvm
384
385#endif