1 //===- DeclBase.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 and DeclContext classes.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "clang/AST/DeclBase.h"
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/ASTLambda.h"
16 #include "clang/AST/ASTMutationListener.h"
17 #include "clang/AST/Attr.h"
18 #include "clang/AST/AttrIterator.h"
19 #include "clang/AST/Decl.h"
20 #include "clang/AST/DeclCXX.h"
21 #include "clang/AST/DeclContextInternals.h"
22 #include "clang/AST/DeclFriend.h"
23 #include "clang/AST/DeclObjC.h"
24 #include "clang/AST/DeclOpenMP.h"
25 #include "clang/AST/DeclTemplate.h"
26 #include "clang/AST/DependentDiagnostic.h"
27 #include "clang/AST/ExternalASTSource.h"
28 #include "clang/AST/Stmt.h"
29 #include "clang/AST/Type.h"
30 #include "clang/Basic/IdentifierTable.h"
31 #include "clang/Basic/LLVM.h"
32 #include "clang/Basic/LangOptions.h"
33 #include "clang/Basic/ObjCRuntime.h"
34 #include "clang/Basic/PartialDiagnostic.h"
35 #include "clang/Basic/SourceLocation.h"
36 #include "clang/Basic/TargetInfo.h"
37 #include "llvm/ADT/ArrayRef.h"
38 #include "llvm/ADT/PointerIntPair.h"
39 #include "llvm/ADT/SmallVector.h"
40 #include "llvm/ADT/StringRef.h"
41 #include "llvm/Support/Casting.h"
42 #include "llvm/Support/ErrorHandling.h"
43 #include "llvm/Support/MathExtras.h"
44 #include "llvm/Support/VersionTuple.h"
45 #include "llvm/Support/raw_ostream.h"
46 #include <algorithm>
47 #include <cassert>
48 #include <cstddef>
49 #include <string>
50 #include <tuple>
51 #include <utility>
52
53 using namespace clang;
54
55 //===----------------------------------------------------------------------===//
56 // Statistics
57 //===----------------------------------------------------------------------===//
58
59 #define DECL(DERIVED, BASE) static int n##DERIVED##s = 0;
60 #define ABSTRACT_DECL(DECL)
61 #include "clang/AST/DeclNodes.inc"
62
updateOutOfDate(IdentifierInfo & II) const63 void Decl::updateOutOfDate(IdentifierInfo &II) const {
64 getASTContext().getExternalSource()->updateOutOfDateIdentifier(II);
65 }
66
67 #define DECL(DERIVED, BASE) \
68 static_assert(alignof(Decl) >= alignof(DERIVED##Decl), \
69 "Alignment sufficient after objects prepended to " #DERIVED);
70 #define ABSTRACT_DECL(DECL)
71 #include "clang/AST/DeclNodes.inc"
72
operator new(std::size_t Size,const ASTContext & Context,unsigned ID,std::size_t Extra)73 void *Decl::operator new(std::size_t Size, const ASTContext &Context,
74 unsigned ID, std::size_t Extra) {
75 // Allocate an extra 8 bytes worth of storage, which ensures that the
76 // resulting pointer will still be 8-byte aligned.
77 static_assert(sizeof(unsigned) * 2 >= alignof(Decl),
78 "Decl won't be misaligned");
79 void *Start = Context.Allocate(Size + Extra + 8);
80 void *Result = (char*)Start + 8;
81
82 unsigned *PrefixPtr = (unsigned *)Result - 2;
83
84 // Zero out the first 4 bytes; this is used to store the owning module ID.
85 PrefixPtr[0] = 0;
86
87 // Store the global declaration ID in the second 4 bytes.
88 PrefixPtr[1] = ID;
89
90 return Result;
91 }
92
operator new(std::size_t Size,const ASTContext & Ctx,DeclContext * Parent,std::size_t Extra)93 void *Decl::operator new(std::size_t Size, const ASTContext &Ctx,
94 DeclContext *Parent, std::size_t Extra) {
95 assert(!Parent || &Parent->getParentASTContext() == &Ctx);
96 // With local visibility enabled, we track the owning module even for local
97 // declarations. We create the TU decl early and may not yet know what the
98 // LangOpts are, so conservatively allocate the storage.
99 if (Ctx.getLangOpts().trackLocalOwningModule() || !Parent) {
100 // Ensure required alignment of the resulting object by adding extra
101 // padding at the start if required.
102 size_t ExtraAlign =
103 llvm::offsetToAlignment(sizeof(Module *), llvm::Align(alignof(Decl)));
104 auto *Buffer = reinterpret_cast<char *>(
105 ::operator new(ExtraAlign + sizeof(Module *) + Size + Extra, Ctx));
106 Buffer += ExtraAlign;
107 auto *ParentModule =
108 Parent ? cast<Decl>(Parent)->getOwningModule() : nullptr;
109 return new (Buffer) Module*(ParentModule) + 1;
110 }
111 return ::operator new(Size + Extra, Ctx);
112 }
113
getOwningModuleSlow() const114 Module *Decl::getOwningModuleSlow() const {
115 assert(isFromASTFile() && "Not from AST file?");
116 return getASTContext().getExternalSource()->getModule(getOwningModuleID());
117 }
118
hasLocalOwningModuleStorage() const119 bool Decl::hasLocalOwningModuleStorage() const {
120 return getASTContext().getLangOpts().trackLocalOwningModule();
121 }
122
getDeclKindName() const123 const char *Decl::getDeclKindName() const {
124 switch (DeclKind) {
125 default: llvm_unreachable("Declaration not in DeclNodes.inc!");
126 #define DECL(DERIVED, BASE) case DERIVED: return #DERIVED;
127 #define ABSTRACT_DECL(DECL)
128 #include "clang/AST/DeclNodes.inc"
129 }
130 }
131
setInvalidDecl(bool Invalid)132 void Decl::setInvalidDecl(bool Invalid) {
133 InvalidDecl = Invalid;
134 assert(!isa<TagDecl>(this) || !cast<TagDecl>(this)->isCompleteDefinition());
135 if (!Invalid) {
136 return;
137 }
138
139 if (!isa<ParmVarDecl>(this)) {
140 // Defensive maneuver for ill-formed code: we're likely not to make it to
141 // a point where we set the access specifier, so default it to "public"
142 // to avoid triggering asserts elsewhere in the front end.
143 setAccess(AS_public);
144 }
145
146 // Marking a DecompositionDecl as invalid implies all the child BindingDecl's
147 // are invalid too.
148 if (auto *DD = dyn_cast<DecompositionDecl>(this)) {
149 for (auto *Binding : DD->bindings()) {
150 Binding->setInvalidDecl();
151 }
152 }
153 }
154
getDeclKindName() const155 const char *DeclContext::getDeclKindName() const {
156 switch (getDeclKind()) {
157 #define DECL(DERIVED, BASE) case Decl::DERIVED: return #DERIVED;
158 #define ABSTRACT_DECL(DECL)
159 #include "clang/AST/DeclNodes.inc"
160 }
161 llvm_unreachable("Declaration context not in DeclNodes.inc!");
162 }
163
164 bool Decl::StatisticsEnabled = false;
EnableStatistics()165 void Decl::EnableStatistics() {
166 StatisticsEnabled = true;
167 }
168
PrintStats()169 void Decl::PrintStats() {
170 llvm::errs() << "\n*** Decl Stats:\n";
171
172 int totalDecls = 0;
173 #define DECL(DERIVED, BASE) totalDecls += n##DERIVED##s;
174 #define ABSTRACT_DECL(DECL)
175 #include "clang/AST/DeclNodes.inc"
176 llvm::errs() << " " << totalDecls << " decls total.\n";
177
178 int totalBytes = 0;
179 #define DECL(DERIVED, BASE) \
180 if (n##DERIVED##s > 0) { \
181 totalBytes += (int)(n##DERIVED##s * sizeof(DERIVED##Decl)); \
182 llvm::errs() << " " << n##DERIVED##s << " " #DERIVED " decls, " \
183 << sizeof(DERIVED##Decl) << " each (" \
184 << n##DERIVED##s * sizeof(DERIVED##Decl) \
185 << " bytes)\n"; \
186 }
187 #define ABSTRACT_DECL(DECL)
188 #include "clang/AST/DeclNodes.inc"
189
190 llvm::errs() << "Total bytes = " << totalBytes << "\n";
191 }
192
add(Kind k)193 void Decl::add(Kind k) {
194 switch (k) {
195 #define DECL(DERIVED, BASE) case DERIVED: ++n##DERIVED##s; break;
196 #define ABSTRACT_DECL(DECL)
197 #include "clang/AST/DeclNodes.inc"
198 }
199 }
200
isTemplateParameterPack() const201 bool Decl::isTemplateParameterPack() const {
202 if (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(this))
203 return TTP->isParameterPack();
204 if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(this))
205 return NTTP->isParameterPack();
206 if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(this))
207 return TTP->isParameterPack();
208 return false;
209 }
210
isParameterPack() const211 bool Decl::isParameterPack() const {
212 if (const auto *Var = dyn_cast<VarDecl>(this))
213 return Var->isParameterPack();
214
215 return isTemplateParameterPack();
216 }
217
getAsFunction()218 FunctionDecl *Decl::getAsFunction() {
219 if (auto *FD = dyn_cast<FunctionDecl>(this))
220 return FD;
221 if (const auto *FTD = dyn_cast<FunctionTemplateDecl>(this))
222 return FTD->getTemplatedDecl();
223 return nullptr;
224 }
225
isTemplateDecl() const226 bool Decl::isTemplateDecl() const {
227 return isa<TemplateDecl>(this);
228 }
229
getDescribedTemplate() const230 TemplateDecl *Decl::getDescribedTemplate() const {
231 if (auto *FD = dyn_cast<FunctionDecl>(this))
232 return FD->getDescribedFunctionTemplate();
233 else if (auto *RD = dyn_cast<CXXRecordDecl>(this))
234 return RD->getDescribedClassTemplate();
235 else if (auto *VD = dyn_cast<VarDecl>(this))
236 return VD->getDescribedVarTemplate();
237 else if (auto *AD = dyn_cast<TypeAliasDecl>(this))
238 return AD->getDescribedAliasTemplate();
239
240 return nullptr;
241 }
242
isTemplated() const243 bool Decl::isTemplated() const {
244 // A declaration is dependent if it is a template or a template pattern, or
245 // is within (lexcially for a friend, semantically otherwise) a dependent
246 // context.
247 // FIXME: Should local extern declarations be treated like friends?
248 if (auto *AsDC = dyn_cast<DeclContext>(this))
249 return AsDC->isDependentContext();
250 auto *DC = getFriendObjectKind() ? getLexicalDeclContext() : getDeclContext();
251 return DC->isDependentContext() || isTemplateDecl() || getDescribedTemplate();
252 }
253
getParentFunctionOrMethod() const254 const DeclContext *Decl::getParentFunctionOrMethod() const {
255 for (const DeclContext *DC = getDeclContext();
256 DC && !DC->isTranslationUnit() && !DC->isNamespace();
257 DC = DC->getParent())
258 if (DC->isFunctionOrMethod())
259 return DC;
260
261 return nullptr;
262 }
263
264 //===----------------------------------------------------------------------===//
265 // PrettyStackTraceDecl Implementation
266 //===----------------------------------------------------------------------===//
267
print(raw_ostream & OS) const268 void PrettyStackTraceDecl::print(raw_ostream &OS) const {
269 SourceLocation TheLoc = Loc;
270 if (TheLoc.isInvalid() && TheDecl)
271 TheLoc = TheDecl->getLocation();
272
273 if (TheLoc.isValid()) {
274 TheLoc.print(OS, SM);
275 OS << ": ";
276 }
277
278 OS << Message;
279
280 if (const auto *DN = dyn_cast_or_null<NamedDecl>(TheDecl)) {
281 OS << " '";
282 DN->printQualifiedName(OS);
283 OS << '\'';
284 }
285 OS << '\n';
286 }
287
288 //===----------------------------------------------------------------------===//
289 // Decl Implementation
290 //===----------------------------------------------------------------------===//
291
292 // Out-of-line virtual method providing a home for Decl.
293 Decl::~Decl() = default;
294
setDeclContext(DeclContext * DC)295 void Decl::setDeclContext(DeclContext *DC) {
296 DeclCtx = DC;
297 }
298
setLexicalDeclContext(DeclContext * DC)299 void Decl::setLexicalDeclContext(DeclContext *DC) {
300 if (DC == getLexicalDeclContext())
301 return;
302
303 if (isInSemaDC()) {
304 setDeclContextsImpl(getDeclContext(), DC, getASTContext());
305 } else {
306 getMultipleDC()->LexicalDC = DC;
307 }
308
309 // FIXME: We shouldn't be changing the lexical context of declarations
310 // imported from AST files.
311 if (!isFromASTFile()) {
312 setModuleOwnershipKind(getModuleOwnershipKindForChildOf(DC));
313 if (hasOwningModule())
314 setLocalOwningModule(cast<Decl>(DC)->getOwningModule());
315 }
316
317 assert(
318 (getModuleOwnershipKind() != ModuleOwnershipKind::VisibleWhenImported ||
319 getOwningModule()) &&
320 "hidden declaration has no owning module");
321 }
322
setDeclContextsImpl(DeclContext * SemaDC,DeclContext * LexicalDC,ASTContext & Ctx)323 void Decl::setDeclContextsImpl(DeclContext *SemaDC, DeclContext *LexicalDC,
324 ASTContext &Ctx) {
325 if (SemaDC == LexicalDC) {
326 DeclCtx = SemaDC;
327 } else {
328 auto *MDC = new (Ctx) Decl::MultipleDC();
329 MDC->SemanticDC = SemaDC;
330 MDC->LexicalDC = LexicalDC;
331 DeclCtx = MDC;
332 }
333 }
334
isInLocalScope() const335 bool Decl::isInLocalScope() const {
336 const DeclContext *LDC = getLexicalDeclContext();
337 while (true) {
338 if (LDC->isFunctionOrMethod())
339 return true;
340 if (!isa<TagDecl>(LDC))
341 return false;
342 if (const auto *CRD = dyn_cast<CXXRecordDecl>(LDC))
343 if (CRD->isLambda())
344 return true;
345 LDC = LDC->getLexicalParent();
346 }
347 return false;
348 }
349
isInAnonymousNamespace() const350 bool Decl::isInAnonymousNamespace() const {
351 for (const DeclContext *DC = getDeclContext(); DC; DC = DC->getParent()) {
352 if (const auto *ND = dyn_cast<NamespaceDecl>(DC))
353 if (ND->isAnonymousNamespace())
354 return true;
355 }
356
357 return false;
358 }
359
isInStdNamespace() const360 bool Decl::isInStdNamespace() const {
361 const DeclContext *DC = getDeclContext();
362 return DC && DC->isStdNamespace();
363 }
364
getTranslationUnitDecl()365 TranslationUnitDecl *Decl::getTranslationUnitDecl() {
366 if (auto *TUD = dyn_cast<TranslationUnitDecl>(this))
367 return TUD;
368
369 DeclContext *DC = getDeclContext();
370 assert(DC && "This decl is not contained in a translation unit!");
371
372 while (!DC->isTranslationUnit()) {
373 DC = DC->getParent();
374 assert(DC && "This decl is not contained in a translation unit!");
375 }
376
377 return cast<TranslationUnitDecl>(DC);
378 }
379
getASTContext() const380 ASTContext &Decl::getASTContext() const {
381 return getTranslationUnitDecl()->getASTContext();
382 }
383
getASTMutationListener() const384 ASTMutationListener *Decl::getASTMutationListener() const {
385 return getASTContext().getASTMutationListener();
386 }
387
getMaxAlignment() const388 unsigned Decl::getMaxAlignment() const {
389 if (!hasAttrs())
390 return 0;
391
392 unsigned Align = 0;
393 const AttrVec &V = getAttrs();
394 ASTContext &Ctx = getASTContext();
395 specific_attr_iterator<AlignedAttr> I(V.begin()), E(V.end());
396 for (; I != E; ++I)
397 Align = std::max(Align, I->getAlignment(Ctx));
398 return Align;
399 }
400
isUsed(bool CheckUsedAttr) const401 bool Decl::isUsed(bool CheckUsedAttr) const {
402 const Decl *CanonD = getCanonicalDecl();
403 if (CanonD->Used)
404 return true;
405
406 // Check for used attribute.
407 // Ask the most recent decl, since attributes accumulate in the redecl chain.
408 if (CheckUsedAttr && getMostRecentDecl()->hasAttr<UsedAttr>())
409 return true;
410
411 // The information may have not been deserialized yet. Force deserialization
412 // to complete the needed information.
413 return getMostRecentDecl()->getCanonicalDecl()->Used;
414 }
415
markUsed(ASTContext & C)416 void Decl::markUsed(ASTContext &C) {
417 if (isUsed(false))
418 return;
419
420 if (C.getASTMutationListener())
421 C.getASTMutationListener()->DeclarationMarkedUsed(this);
422
423 setIsUsed();
424 }
425
isReferenced() const426 bool Decl::isReferenced() const {
427 if (Referenced)
428 return true;
429
430 // Check redeclarations.
431 for (const auto *I : redecls())
432 if (I->Referenced)
433 return true;
434
435 return false;
436 }
437
getExternalSourceSymbolAttr() const438 ExternalSourceSymbolAttr *Decl::getExternalSourceSymbolAttr() const {
439 const Decl *Definition = nullptr;
440 if (auto *ID = dyn_cast<ObjCInterfaceDecl>(this)) {
441 Definition = ID->getDefinition();
442 } else if (auto *PD = dyn_cast<ObjCProtocolDecl>(this)) {
443 Definition = PD->getDefinition();
444 } else if (auto *TD = dyn_cast<TagDecl>(this)) {
445 Definition = TD->getDefinition();
446 }
447 if (!Definition)
448 Definition = this;
449
450 if (auto *attr = Definition->getAttr<ExternalSourceSymbolAttr>())
451 return attr;
452 if (auto *dcd = dyn_cast<Decl>(getDeclContext())) {
453 return dcd->getAttr<ExternalSourceSymbolAttr>();
454 }
455
456 return nullptr;
457 }
458
hasDefiningAttr() const459 bool Decl::hasDefiningAttr() const {
460 return hasAttr<AliasAttr>() || hasAttr<IFuncAttr>();
461 }
462
getDefiningAttr() const463 const Attr *Decl::getDefiningAttr() const {
464 if (auto *AA = getAttr<AliasAttr>())
465 return AA;
466 if (auto *IFA = getAttr<IFuncAttr>())
467 return IFA;
468 return nullptr;
469 }
470
getRealizedPlatform(const AvailabilityAttr * A,const ASTContext & Context)471 static StringRef getRealizedPlatform(const AvailabilityAttr *A,
472 const ASTContext &Context) {
473 // Check if this is an App Extension "platform", and if so chop off
474 // the suffix for matching with the actual platform.
475 StringRef RealizedPlatform = A->getPlatform()->getName();
476 if (!Context.getLangOpts().AppExt)
477 return RealizedPlatform;
478 size_t suffix = RealizedPlatform.rfind("_app_extension");
479 if (suffix != StringRef::npos)
480 return RealizedPlatform.slice(0, suffix);
481 return RealizedPlatform;
482 }
483
484 /// Determine the availability of the given declaration based on
485 /// the target platform.
486 ///
487 /// When it returns an availability result other than \c AR_Available,
488 /// if the \p Message parameter is non-NULL, it will be set to a
489 /// string describing why the entity is unavailable.
490 ///
491 /// FIXME: Make these strings localizable, since they end up in
492 /// diagnostics.
CheckAvailability(ASTContext & Context,const AvailabilityAttr * A,std::string * Message,VersionTuple EnclosingVersion)493 static AvailabilityResult CheckAvailability(ASTContext &Context,
494 const AvailabilityAttr *A,
495 std::string *Message,
496 VersionTuple EnclosingVersion) {
497 if (EnclosingVersion.empty())
498 EnclosingVersion = Context.getTargetInfo().getPlatformMinVersion();
499
500 if (EnclosingVersion.empty())
501 return AR_Available;
502
503 StringRef ActualPlatform = A->getPlatform()->getName();
504 StringRef TargetPlatform = Context.getTargetInfo().getPlatformName();
505
506 // Match the platform name.
507 if (getRealizedPlatform(A, Context) != TargetPlatform)
508 return AR_Available;
509
510 StringRef PrettyPlatformName
511 = AvailabilityAttr::getPrettyPlatformName(ActualPlatform);
512
513 if (PrettyPlatformName.empty())
514 PrettyPlatformName = ActualPlatform;
515
516 std::string HintMessage;
517 if (!A->getMessage().empty()) {
518 HintMessage = " - ";
519 HintMessage += A->getMessage();
520 }
521
522 // Make sure that this declaration has not been marked 'unavailable'.
523 if (A->getUnavailable()) {
524 if (Message) {
525 Message->clear();
526 llvm::raw_string_ostream Out(*Message);
527 Out << "not available on " << PrettyPlatformName
528 << HintMessage;
529 }
530
531 return AR_Unavailable;
532 }
533
534 // Make sure that this declaration has already been introduced.
535 if (!A->getIntroduced().empty() &&
536 EnclosingVersion < A->getIntroduced()) {
537 if (Message) {
538 Message->clear();
539 llvm::raw_string_ostream Out(*Message);
540 VersionTuple VTI(A->getIntroduced());
541 Out << "introduced in " << PrettyPlatformName << ' '
542 << VTI << HintMessage;
543 }
544
545 return A->getStrict() ? AR_Unavailable : AR_NotYetIntroduced;
546 }
547
548 // Make sure that this declaration hasn't been obsoleted.
549 if (!A->getObsoleted().empty() && EnclosingVersion >= A->getObsoleted()) {
550 if (Message) {
551 Message->clear();
552 llvm::raw_string_ostream Out(*Message);
553 VersionTuple VTO(A->getObsoleted());
554 Out << "obsoleted in " << PrettyPlatformName << ' '
555 << VTO << HintMessage;
556 }
557
558 return AR_Unavailable;
559 }
560
561 // Make sure that this declaration hasn't been deprecated.
562 if (!A->getDeprecated().empty() && EnclosingVersion >= A->getDeprecated()) {
563 if (Message) {
564 Message->clear();
565 llvm::raw_string_ostream Out(*Message);
566 VersionTuple VTD(A->getDeprecated());
567 Out << "first deprecated in " << PrettyPlatformName << ' '
568 << VTD << HintMessage;
569 }
570
571 return AR_Deprecated;
572 }
573
574 return AR_Available;
575 }
576
getAvailability(std::string * Message,VersionTuple EnclosingVersion,StringRef * RealizedPlatform) const577 AvailabilityResult Decl::getAvailability(std::string *Message,
578 VersionTuple EnclosingVersion,
579 StringRef *RealizedPlatform) const {
580 if (auto *FTD = dyn_cast<FunctionTemplateDecl>(this))
581 return FTD->getTemplatedDecl()->getAvailability(Message, EnclosingVersion,
582 RealizedPlatform);
583
584 AvailabilityResult Result = AR_Available;
585 std::string ResultMessage;
586
587 for (const auto *A : attrs()) {
588 if (const auto *Deprecated = dyn_cast<DeprecatedAttr>(A)) {
589 if (Result >= AR_Deprecated)
590 continue;
591
592 if (Message)
593 ResultMessage = Deprecated->getMessage();
594
595 Result = AR_Deprecated;
596 continue;
597 }
598
599 if (const auto *Unavailable = dyn_cast<UnavailableAttr>(A)) {
600 if (Message)
601 *Message = Unavailable->getMessage();
602 return AR_Unavailable;
603 }
604
605 if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) {
606 AvailabilityResult AR = CheckAvailability(getASTContext(), Availability,
607 Message, EnclosingVersion);
608
609 if (AR == AR_Unavailable) {
610 if (RealizedPlatform)
611 *RealizedPlatform = Availability->getPlatform()->getName();
612 return AR_Unavailable;
613 }
614
615 if (AR > Result) {
616 Result = AR;
617 if (Message)
618 ResultMessage.swap(*Message);
619 }
620 continue;
621 }
622 }
623
624 if (Message)
625 Message->swap(ResultMessage);
626 return Result;
627 }
628
getVersionIntroduced() const629 VersionTuple Decl::getVersionIntroduced() const {
630 const ASTContext &Context = getASTContext();
631 StringRef TargetPlatform = Context.getTargetInfo().getPlatformName();
632 for (const auto *A : attrs()) {
633 if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) {
634 if (getRealizedPlatform(Availability, Context) != TargetPlatform)
635 continue;
636 if (!Availability->getIntroduced().empty())
637 return Availability->getIntroduced();
638 }
639 }
640 return {};
641 }
642
canBeWeakImported(bool & IsDefinition) const643 bool Decl::canBeWeakImported(bool &IsDefinition) const {
644 IsDefinition = false;
645
646 // Variables, if they aren't definitions.
647 if (const auto *Var = dyn_cast<VarDecl>(this)) {
648 if (Var->isThisDeclarationADefinition()) {
649 IsDefinition = true;
650 return false;
651 }
652 return true;
653
654 // Functions, if they aren't definitions.
655 } else if (const auto *FD = dyn_cast<FunctionDecl>(this)) {
656 if (FD->hasBody()) {
657 IsDefinition = true;
658 return false;
659 }
660 return true;
661
662 // Objective-C classes, if this is the non-fragile runtime.
663 } else if (isa<ObjCInterfaceDecl>(this) &&
664 getASTContext().getLangOpts().ObjCRuntime.hasWeakClassImport()) {
665 return true;
666
667 // Nothing else.
668 } else {
669 return false;
670 }
671 }
672
isWeakImported() const673 bool Decl::isWeakImported() const {
674 bool IsDefinition;
675 if (!canBeWeakImported(IsDefinition))
676 return false;
677
678 for (const auto *A : attrs()) {
679 if (isa<WeakImportAttr>(A))
680 return true;
681
682 if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) {
683 if (CheckAvailability(getASTContext(), Availability, nullptr,
684 VersionTuple()) == AR_NotYetIntroduced)
685 return true;
686 }
687 }
688
689 return false;
690 }
691
getIdentifierNamespaceForKind(Kind DeclKind)692 unsigned Decl::getIdentifierNamespaceForKind(Kind DeclKind) {
693 switch (DeclKind) {
694 case Function:
695 case CXXDeductionGuide:
696 case CXXMethod:
697 case CXXConstructor:
698 case ConstructorUsingShadow:
699 case CXXDestructor:
700 case CXXConversion:
701 case EnumConstant:
702 case Var:
703 case ImplicitParam:
704 case ParmVar:
705 case ObjCMethod:
706 case ObjCProperty:
707 case MSProperty:
708 return IDNS_Ordinary;
709 case Label:
710 return IDNS_Label;
711 case IndirectField:
712 return IDNS_Ordinary | IDNS_Member;
713
714 case Binding:
715 case NonTypeTemplateParm:
716 case VarTemplate:
717 case Concept:
718 // These (C++-only) declarations are found by redeclaration lookup for
719 // tag types, so we include them in the tag namespace.
720 return IDNS_Ordinary | IDNS_Tag;
721
722 case ObjCCompatibleAlias:
723 case ObjCInterface:
724 return IDNS_Ordinary | IDNS_Type;
725
726 case Typedef:
727 case TypeAlias:
728 case TemplateTypeParm:
729 case ObjCTypeParam:
730 return IDNS_Ordinary | IDNS_Type;
731
732 case UnresolvedUsingTypename:
733 return IDNS_Ordinary | IDNS_Type | IDNS_Using;
734
735 case UsingShadow:
736 return 0; // we'll actually overwrite this later
737
738 case UnresolvedUsingValue:
739 return IDNS_Ordinary | IDNS_Using;
740
741 case Using:
742 case UsingPack:
743 return IDNS_Using;
744
745 case ObjCProtocol:
746 return IDNS_ObjCProtocol;
747
748 case Field:
749 case ObjCAtDefsField:
750 case ObjCIvar:
751 return IDNS_Member;
752
753 case Record:
754 case CXXRecord:
755 case Enum:
756 return IDNS_Tag | IDNS_Type;
757
758 case Namespace:
759 case NamespaceAlias:
760 return IDNS_Namespace;
761
762 case FunctionTemplate:
763 return IDNS_Ordinary;
764
765 case ClassTemplate:
766 case TemplateTemplateParm:
767 case TypeAliasTemplate:
768 return IDNS_Ordinary | IDNS_Tag | IDNS_Type;
769
770 case OMPDeclareReduction:
771 return IDNS_OMPReduction;
772
773 case OMPDeclareMapper:
774 return IDNS_OMPMapper;
775
776 // Never have names.
777 case Friend:
778 case FriendTemplate:
779 case AccessSpec:
780 case LinkageSpec:
781 case Export:
782 case FileScopeAsm:
783 case StaticAssert:
784 case ObjCPropertyImpl:
785 case PragmaComment:
786 case PragmaDetectMismatch:
787 case Block:
788 case Captured:
789 case TranslationUnit:
790 case ExternCContext:
791 case Decomposition:
792
793 case UsingDirective:
794 case BuiltinTemplate:
795 case ClassTemplateSpecialization:
796 case ClassTemplatePartialSpecialization:
797 case ClassScopeFunctionSpecialization:
798 case VarTemplateSpecialization:
799 case VarTemplatePartialSpecialization:
800 case ObjCImplementation:
801 case ObjCCategory:
802 case ObjCCategoryImpl:
803 case Import:
804 case OMPThreadPrivate:
805 case OMPAllocate:
806 case OMPRequires:
807 case OMPCapturedExpr:
808 case Empty:
809 case LifetimeExtendedTemporary:
810 case RequiresExprBody:
811 // Never looked up by name.
812 return 0;
813 }
814
815 llvm_unreachable("Invalid DeclKind!");
816 }
817
setAttrsImpl(const AttrVec & attrs,ASTContext & Ctx)818 void Decl::setAttrsImpl(const AttrVec &attrs, ASTContext &Ctx) {
819 assert(!HasAttrs && "Decl already contains attrs.");
820
821 AttrVec &AttrBlank = Ctx.getDeclAttrs(this);
822 assert(AttrBlank.empty() && "HasAttrs was wrong?");
823
824 AttrBlank = attrs;
825 HasAttrs = true;
826 }
827
dropAttrs()828 void Decl::dropAttrs() {
829 if (!HasAttrs) return;
830
831 HasAttrs = false;
832 getASTContext().eraseDeclAttrs(this);
833 }
834
addAttr(Attr * A)835 void Decl::addAttr(Attr *A) {
836 if (!hasAttrs()) {
837 setAttrs(AttrVec(1, A));
838 return;
839 }
840
841 AttrVec &Attrs = getAttrs();
842 if (!A->isInherited()) {
843 Attrs.push_back(A);
844 return;
845 }
846
847 // Attribute inheritance is processed after attribute parsing. To keep the
848 // order as in the source code, add inherited attributes before non-inherited
849 // ones.
850 auto I = Attrs.begin(), E = Attrs.end();
851 for (; I != E; ++I) {
852 if (!(*I)->isInherited())
853 break;
854 }
855 Attrs.insert(I, A);
856 }
857
getAttrs() const858 const AttrVec &Decl::getAttrs() const {
859 assert(HasAttrs && "No attrs to get!");
860 return getASTContext().getDeclAttrs(this);
861 }
862
castFromDeclContext(const DeclContext * D)863 Decl *Decl::castFromDeclContext (const DeclContext *D) {
864 Decl::Kind DK = D->getDeclKind();
865 switch(DK) {
866 #define DECL(NAME, BASE)
867 #define DECL_CONTEXT(NAME) \
868 case Decl::NAME: \
869 return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D));
870 #define DECL_CONTEXT_BASE(NAME)
871 #include "clang/AST/DeclNodes.inc"
872 default:
873 #define DECL(NAME, BASE)
874 #define DECL_CONTEXT_BASE(NAME) \
875 if (DK >= first##NAME && DK <= last##NAME) \
876 return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D));
877 #include "clang/AST/DeclNodes.inc"
878 llvm_unreachable("a decl that inherits DeclContext isn't handled");
879 }
880 }
881
castToDeclContext(const Decl * D)882 DeclContext *Decl::castToDeclContext(const Decl *D) {
883 Decl::Kind DK = D->getKind();
884 switch(DK) {
885 #define DECL(NAME, BASE)
886 #define DECL_CONTEXT(NAME) \
887 case Decl::NAME: \
888 return static_cast<NAME##Decl *>(const_cast<Decl *>(D));
889 #define DECL_CONTEXT_BASE(NAME)
890 #include "clang/AST/DeclNodes.inc"
891 default:
892 #define DECL(NAME, BASE)
893 #define DECL_CONTEXT_BASE(NAME) \
894 if (DK >= first##NAME && DK <= last##NAME) \
895 return static_cast<NAME##Decl *>(const_cast<Decl *>(D));
896 #include "clang/AST/DeclNodes.inc"
897 llvm_unreachable("a decl that inherits DeclContext isn't handled");
898 }
899 }
900
getBodyRBrace() const901 SourceLocation Decl::getBodyRBrace() const {
902 // Special handling of FunctionDecl to avoid de-serializing the body from PCH.
903 // FunctionDecl stores EndRangeLoc for this purpose.
904 if (const auto *FD = dyn_cast<FunctionDecl>(this)) {
905 const FunctionDecl *Definition;
906 if (FD->hasBody(Definition))
907 return Definition->getSourceRange().getEnd();
908 return {};
909 }
910
911 if (Stmt *Body = getBody())
912 return Body->getSourceRange().getEnd();
913
914 return {};
915 }
916
AccessDeclContextSanity() const917 bool Decl::AccessDeclContextSanity() const {
918 #ifndef NDEBUG
919 // Suppress this check if any of the following hold:
920 // 1. this is the translation unit (and thus has no parent)
921 // 2. this is a template parameter (and thus doesn't belong to its context)
922 // 3. this is a non-type template parameter
923 // 4. the context is not a record
924 // 5. it's invalid
925 // 6. it's a C++0x static_assert.
926 // 7. it's a block literal declaration
927 if (isa<TranslationUnitDecl>(this) ||
928 isa<TemplateTypeParmDecl>(this) ||
929 isa<NonTypeTemplateParmDecl>(this) ||
930 !getDeclContext() ||
931 !isa<CXXRecordDecl>(getDeclContext()) ||
932 isInvalidDecl() ||
933 isa<StaticAssertDecl>(this) ||
934 isa<BlockDecl>(this) ||
935 // FIXME: a ParmVarDecl can have ClassTemplateSpecialization
936 // as DeclContext (?).
937 isa<ParmVarDecl>(this) ||
938 // FIXME: a ClassTemplateSpecialization or CXXRecordDecl can have
939 // AS_none as access specifier.
940 isa<CXXRecordDecl>(this) ||
941 isa<ClassScopeFunctionSpecializationDecl>(this))
942 return true;
943
944 assert(Access != AS_none &&
945 "Access specifier is AS_none inside a record decl");
946 #endif
947 return true;
948 }
949
getKind(const Decl * D)950 static Decl::Kind getKind(const Decl *D) { return D->getKind(); }
getKind(const DeclContext * DC)951 static Decl::Kind getKind(const DeclContext *DC) { return DC->getDeclKind(); }
952
getID() const953 int64_t Decl::getID() const {
954 return getASTContext().getAllocator().identifyKnownAlignedObject<Decl>(this);
955 }
956
getFunctionType(bool BlocksToo) const957 const FunctionType *Decl::getFunctionType(bool BlocksToo) const {
958 QualType Ty;
959 if (const auto *D = dyn_cast<ValueDecl>(this))
960 Ty = D->getType();
961 else if (const auto *D = dyn_cast<TypedefNameDecl>(this))
962 Ty = D->getUnderlyingType();
963 else
964 return nullptr;
965
966 if (Ty->isFunctionPointerType())
967 Ty = Ty->castAs<PointerType>()->getPointeeType();
968 else if (Ty->isFunctionReferenceType())
969 Ty = Ty->castAs<ReferenceType>()->getPointeeType();
970 else if (BlocksToo && Ty->isBlockPointerType())
971 Ty = Ty->castAs<BlockPointerType>()->getPointeeType();
972
973 return Ty->getAs<FunctionType>();
974 }
975
976 /// Starting at a given context (a Decl or DeclContext), look for a
977 /// code context that is not a closure (a lambda, block, etc.).
getNonClosureContext(T * D)978 template <class T> static Decl *getNonClosureContext(T *D) {
979 if (getKind(D) == Decl::CXXMethod) {
980 auto *MD = cast<CXXMethodDecl>(D);
981 if (MD->getOverloadedOperator() == OO_Call &&
982 MD->getParent()->isLambda())
983 return getNonClosureContext(MD->getParent()->getParent());
984 return MD;
985 } else if (auto *FD = dyn_cast<FunctionDecl>(D))
986 return FD;
987 else if (auto *MD = dyn_cast<ObjCMethodDecl>(D))
988 return MD;
989 else if (auto *BD = dyn_cast<BlockDecl>(D))
990 return getNonClosureContext(BD->getParent());
991 else if (auto *CD = dyn_cast<CapturedDecl>(D))
992 return getNonClosureContext(CD->getParent());
993 else
994 return nullptr;
995 }
996
getNonClosureContext()997 Decl *Decl::getNonClosureContext() {
998 return ::getNonClosureContext(this);
999 }
1000
getNonClosureAncestor()1001 Decl *DeclContext::getNonClosureAncestor() {
1002 return ::getNonClosureContext(this);
1003 }
1004
1005 //===----------------------------------------------------------------------===//
1006 // DeclContext Implementation
1007 //===----------------------------------------------------------------------===//
1008
DeclContext(Decl::Kind K)1009 DeclContext::DeclContext(Decl::Kind K) {
1010 DeclContextBits.DeclKind = K;
1011 setHasExternalLexicalStorage(false);
1012 setHasExternalVisibleStorage(false);
1013 setNeedToReconcileExternalVisibleStorage(false);
1014 setHasLazyLocalLexicalLookups(false);
1015 setHasLazyExternalLexicalLookups(false);
1016 setUseQualifiedLookup(false);
1017 }
1018
classof(const Decl * D)1019 bool DeclContext::classof(const Decl *D) {
1020 switch (D->getKind()) {
1021 #define DECL(NAME, BASE)
1022 #define DECL_CONTEXT(NAME) case Decl::NAME:
1023 #define DECL_CONTEXT_BASE(NAME)
1024 #include "clang/AST/DeclNodes.inc"
1025 return true;
1026 default:
1027 #define DECL(NAME, BASE)
1028 #define DECL_CONTEXT_BASE(NAME) \
1029 if (D->getKind() >= Decl::first##NAME && \
1030 D->getKind() <= Decl::last##NAME) \
1031 return true;
1032 #include "clang/AST/DeclNodes.inc"
1033 return false;
1034 }
1035 }
1036
1037 DeclContext::~DeclContext() = default;
1038
1039 /// Find the parent context of this context that will be
1040 /// used for unqualified name lookup.
1041 ///
1042 /// Generally, the parent lookup context is the semantic context. However, for
1043 /// a friend function the parent lookup context is the lexical context, which
1044 /// is the class in which the friend is declared.
getLookupParent()1045 DeclContext *DeclContext::getLookupParent() {
1046 // FIXME: Find a better way to identify friends.
1047 if (isa<FunctionDecl>(this))
1048 if (getParent()->getRedeclContext()->isFileContext() &&
1049 getLexicalParent()->getRedeclContext()->isRecord())
1050 return getLexicalParent();
1051
1052 // A lookup within the call operator of a lambda never looks in the lambda
1053 // class; instead, skip to the context in which that closure type is
1054 // declared.
1055 if (isLambdaCallOperator(this))
1056 return getParent()->getParent();
1057
1058 return getParent();
1059 }
1060
getInnermostBlockDecl() const1061 const BlockDecl *DeclContext::getInnermostBlockDecl() const {
1062 const DeclContext *Ctx = this;
1063
1064 do {
1065 if (Ctx->isClosure())
1066 return cast<BlockDecl>(Ctx);
1067 Ctx = Ctx->getParent();
1068 } while (Ctx);
1069
1070 return nullptr;
1071 }
1072
isInlineNamespace() const1073 bool DeclContext::isInlineNamespace() const {
1074 return isNamespace() &&
1075 cast<NamespaceDecl>(this)->isInline();
1076 }
1077
isStdNamespace() const1078 bool DeclContext::isStdNamespace() const {
1079 if (!isNamespace())
1080 return false;
1081
1082 const auto *ND = cast<NamespaceDecl>(this);
1083 if (ND->isInline()) {
1084 return ND->getParent()->isStdNamespace();
1085 }
1086
1087 if (!getParent()->getRedeclContext()->isTranslationUnit())
1088 return false;
1089
1090 const IdentifierInfo *II = ND->getIdentifier();
1091 return II && II->isStr("std");
1092 }
1093
isDependentContext() const1094 bool DeclContext::isDependentContext() const {
1095 if (isFileContext())
1096 return false;
1097
1098 if (isa<ClassTemplatePartialSpecializationDecl>(this))
1099 return true;
1100
1101 if (const auto *Record = dyn_cast<CXXRecordDecl>(this)) {
1102 if (Record->getDescribedClassTemplate())
1103 return true;
1104
1105 if (Record->isDependentLambda())
1106 return true;
1107 }
1108
1109 if (const auto *Function = dyn_cast<FunctionDecl>(this)) {
1110 if (Function->getDescribedFunctionTemplate())
1111 return true;
1112
1113 // Friend function declarations are dependent if their *lexical*
1114 // context is dependent.
1115 if (cast<Decl>(this)->getFriendObjectKind())
1116 return getLexicalParent()->isDependentContext();
1117 }
1118
1119 // FIXME: A variable template is a dependent context, but is not a
1120 // DeclContext. A context within it (such as a lambda-expression)
1121 // should be considered dependent.
1122
1123 return getParent() && getParent()->isDependentContext();
1124 }
1125
isTransparentContext() const1126 bool DeclContext::isTransparentContext() const {
1127 if (getDeclKind() == Decl::Enum)
1128 return !cast<EnumDecl>(this)->isScoped();
1129 else if (getDeclKind() == Decl::LinkageSpec || getDeclKind() == Decl::Export)
1130 return true;
1131
1132 return false;
1133 }
1134
isLinkageSpecContext(const DeclContext * DC,LinkageSpecDecl::LanguageIDs ID)1135 static bool isLinkageSpecContext(const DeclContext *DC,
1136 LinkageSpecDecl::LanguageIDs ID) {
1137 while (DC->getDeclKind() != Decl::TranslationUnit) {
1138 if (DC->getDeclKind() == Decl::LinkageSpec)
1139 return cast<LinkageSpecDecl>(DC)->getLanguage() == ID;
1140 DC = DC->getLexicalParent();
1141 }
1142 return false;
1143 }
1144
isExternCContext() const1145 bool DeclContext::isExternCContext() const {
1146 return isLinkageSpecContext(this, LinkageSpecDecl::lang_c);
1147 }
1148
getExternCContext() const1149 const LinkageSpecDecl *DeclContext::getExternCContext() const {
1150 const DeclContext *DC = this;
1151 while (DC->getDeclKind() != Decl::TranslationUnit) {
1152 if (DC->getDeclKind() == Decl::LinkageSpec &&
1153 cast<LinkageSpecDecl>(DC)->getLanguage() == LinkageSpecDecl::lang_c)
1154 return cast<LinkageSpecDecl>(DC);
1155 DC = DC->getLexicalParent();
1156 }
1157 return nullptr;
1158 }
1159
isExternCXXContext() const1160 bool DeclContext::isExternCXXContext() const {
1161 return isLinkageSpecContext(this, LinkageSpecDecl::lang_cxx);
1162 }
1163
Encloses(const DeclContext * DC) const1164 bool DeclContext::Encloses(const DeclContext *DC) const {
1165 if (getPrimaryContext() != this)
1166 return getPrimaryContext()->Encloses(DC);
1167
1168 for (; DC; DC = DC->getParent())
1169 if (DC->getPrimaryContext() == this)
1170 return true;
1171 return false;
1172 }
1173
getPrimaryContext()1174 DeclContext *DeclContext::getPrimaryContext() {
1175 switch (getDeclKind()) {
1176 case Decl::TranslationUnit:
1177 case Decl::ExternCContext:
1178 case Decl::LinkageSpec:
1179 case Decl::Export:
1180 case Decl::Block:
1181 case Decl::Captured:
1182 case Decl::OMPDeclareReduction:
1183 case Decl::OMPDeclareMapper:
1184 case Decl::RequiresExprBody:
1185 // There is only one DeclContext for these entities.
1186 return this;
1187
1188 case Decl::Namespace:
1189 // The original namespace is our primary context.
1190 return static_cast<NamespaceDecl *>(this)->getOriginalNamespace();
1191
1192 case Decl::ObjCMethod:
1193 return this;
1194
1195 case Decl::ObjCInterface:
1196 if (auto *OID = dyn_cast<ObjCInterfaceDecl>(this))
1197 if (auto *Def = OID->getDefinition())
1198 return Def;
1199 return this;
1200
1201 case Decl::ObjCProtocol:
1202 if (auto *OPD = dyn_cast<ObjCProtocolDecl>(this))
1203 if (auto *Def = OPD->getDefinition())
1204 return Def;
1205 return this;
1206
1207 case Decl::ObjCCategory:
1208 return this;
1209
1210 case Decl::ObjCImplementation:
1211 case Decl::ObjCCategoryImpl:
1212 return this;
1213
1214 default:
1215 if (getDeclKind() >= Decl::firstTag && getDeclKind() <= Decl::lastTag) {
1216 // If this is a tag type that has a definition or is currently
1217 // being defined, that definition is our primary context.
1218 auto *Tag = cast<TagDecl>(this);
1219
1220 if (TagDecl *Def = Tag->getDefinition())
1221 return Def;
1222
1223 if (const auto *TagTy = dyn_cast<TagType>(Tag->getTypeForDecl())) {
1224 // Note, TagType::getDecl returns the (partial) definition one exists.
1225 TagDecl *PossiblePartialDef = TagTy->getDecl();
1226 if (PossiblePartialDef->isBeingDefined())
1227 return PossiblePartialDef;
1228 } else {
1229 assert(isa<InjectedClassNameType>(Tag->getTypeForDecl()));
1230 }
1231
1232 return Tag;
1233 }
1234
1235 assert(getDeclKind() >= Decl::firstFunction &&
1236 getDeclKind() <= Decl::lastFunction &&
1237 "Unknown DeclContext kind");
1238 return this;
1239 }
1240 }
1241
1242 void
collectAllContexts(SmallVectorImpl<DeclContext * > & Contexts)1243 DeclContext::collectAllContexts(SmallVectorImpl<DeclContext *> &Contexts){
1244 Contexts.clear();
1245
1246 if (getDeclKind() != Decl::Namespace) {
1247 Contexts.push_back(this);
1248 return;
1249 }
1250
1251 auto *Self = static_cast<NamespaceDecl *>(this);
1252 for (NamespaceDecl *N = Self->getMostRecentDecl(); N;
1253 N = N->getPreviousDecl())
1254 Contexts.push_back(N);
1255
1256 std::reverse(Contexts.begin(), Contexts.end());
1257 }
1258
1259 std::pair<Decl *, Decl *>
BuildDeclChain(ArrayRef<Decl * > Decls,bool FieldsAlreadyLoaded)1260 DeclContext::BuildDeclChain(ArrayRef<Decl *> Decls,
1261 bool FieldsAlreadyLoaded) {
1262 // Build up a chain of declarations via the Decl::NextInContextAndBits field.
1263 Decl *FirstNewDecl = nullptr;
1264 Decl *PrevDecl = nullptr;
1265 for (auto *D : Decls) {
1266 if (FieldsAlreadyLoaded && isa<FieldDecl>(D))
1267 continue;
1268
1269 if (PrevDecl)
1270 PrevDecl->NextInContextAndBits.setPointer(D);
1271 else
1272 FirstNewDecl = D;
1273
1274 PrevDecl = D;
1275 }
1276
1277 return std::make_pair(FirstNewDecl, PrevDecl);
1278 }
1279
1280 /// We have just acquired external visible storage, and we already have
1281 /// built a lookup map. For every name in the map, pull in the new names from
1282 /// the external storage.
reconcileExternalVisibleStorage() const1283 void DeclContext::reconcileExternalVisibleStorage() const {
1284 assert(hasNeedToReconcileExternalVisibleStorage() && LookupPtr);
1285 setNeedToReconcileExternalVisibleStorage(false);
1286
1287 for (auto &Lookup : *LookupPtr)
1288 Lookup.second.setHasExternalDecls();
1289 }
1290
1291 /// Load the declarations within this lexical storage from an
1292 /// external source.
1293 /// \return \c true if any declarations were added.
1294 bool
LoadLexicalDeclsFromExternalStorage() const1295 DeclContext::LoadLexicalDeclsFromExternalStorage() const {
1296 ExternalASTSource *Source = getParentASTContext().getExternalSource();
1297 assert(hasExternalLexicalStorage() && Source && "No external storage?");
1298
1299 // Notify that we have a DeclContext that is initializing.
1300 ExternalASTSource::Deserializing ADeclContext(Source);
1301
1302 // Load the external declarations, if any.
1303 SmallVector<Decl*, 64> Decls;
1304 setHasExternalLexicalStorage(false);
1305 Source->FindExternalLexicalDecls(this, Decls);
1306
1307 if (Decls.empty())
1308 return false;
1309
1310 // We may have already loaded just the fields of this record, in which case
1311 // we need to ignore them.
1312 bool FieldsAlreadyLoaded = false;
1313 if (const auto *RD = dyn_cast<RecordDecl>(this))
1314 FieldsAlreadyLoaded = RD->hasLoadedFieldsFromExternalStorage();
1315
1316 // Splice the newly-read declarations into the beginning of the list
1317 // of declarations.
1318 Decl *ExternalFirst, *ExternalLast;
1319 std::tie(ExternalFirst, ExternalLast) =
1320 BuildDeclChain(Decls, FieldsAlreadyLoaded);
1321 ExternalLast->NextInContextAndBits.setPointer(FirstDecl);
1322 FirstDecl = ExternalFirst;
1323 if (!LastDecl)
1324 LastDecl = ExternalLast;
1325 return true;
1326 }
1327
1328 DeclContext::lookup_result
SetNoExternalVisibleDeclsForName(const DeclContext * DC,DeclarationName Name)1329 ExternalASTSource::SetNoExternalVisibleDeclsForName(const DeclContext *DC,
1330 DeclarationName Name) {
1331 ASTContext &Context = DC->getParentASTContext();
1332 StoredDeclsMap *Map;
1333 if (!(Map = DC->LookupPtr))
1334 Map = DC->CreateStoredDeclsMap(Context);
1335 if (DC->hasNeedToReconcileExternalVisibleStorage())
1336 DC->reconcileExternalVisibleStorage();
1337
1338 (*Map)[Name].removeExternalDecls();
1339
1340 return DeclContext::lookup_result();
1341 }
1342
1343 DeclContext::lookup_result
SetExternalVisibleDeclsForName(const DeclContext * DC,DeclarationName Name,ArrayRef<NamedDecl * > Decls)1344 ExternalASTSource::SetExternalVisibleDeclsForName(const DeclContext *DC,
1345 DeclarationName Name,
1346 ArrayRef<NamedDecl*> Decls) {
1347 ASTContext &Context = DC->getParentASTContext();
1348 StoredDeclsMap *Map;
1349 if (!(Map = DC->LookupPtr))
1350 Map = DC->CreateStoredDeclsMap(Context);
1351 if (DC->hasNeedToReconcileExternalVisibleStorage())
1352 DC->reconcileExternalVisibleStorage();
1353
1354 StoredDeclsList &List = (*Map)[Name];
1355
1356 // Clear out any old external visible declarations, to avoid quadratic
1357 // performance in the redeclaration checks below.
1358 List.removeExternalDecls();
1359
1360 if (!List.isNull()) {
1361 // We have both existing declarations and new declarations for this name.
1362 // Some of the declarations may simply replace existing ones. Handle those
1363 // first.
1364 llvm::SmallVector<unsigned, 8> Skip;
1365 for (unsigned I = 0, N = Decls.size(); I != N; ++I)
1366 if (List.HandleRedeclaration(Decls[I], /*IsKnownNewer*/false))
1367 Skip.push_back(I);
1368 Skip.push_back(Decls.size());
1369
1370 // Add in any new declarations.
1371 unsigned SkipPos = 0;
1372 for (unsigned I = 0, N = Decls.size(); I != N; ++I) {
1373 if (I == Skip[SkipPos])
1374 ++SkipPos;
1375 else
1376 List.AddSubsequentDecl(Decls[I]);
1377 }
1378 } else {
1379 // Convert the array to a StoredDeclsList.
1380 for (auto *D : Decls) {
1381 if (List.isNull())
1382 List.setOnlyValue(D);
1383 else
1384 List.AddSubsequentDecl(D);
1385 }
1386 }
1387
1388 return List.getLookupResult();
1389 }
1390
decls_begin() const1391 DeclContext::decl_iterator DeclContext::decls_begin() const {
1392 if (hasExternalLexicalStorage())
1393 LoadLexicalDeclsFromExternalStorage();
1394 return decl_iterator(FirstDecl);
1395 }
1396
decls_empty() const1397 bool DeclContext::decls_empty() const {
1398 if (hasExternalLexicalStorage())
1399 LoadLexicalDeclsFromExternalStorage();
1400
1401 return !FirstDecl;
1402 }
1403
containsDecl(Decl * D) const1404 bool DeclContext::containsDecl(Decl *D) const {
1405 return (D->getLexicalDeclContext() == this &&
1406 (D->NextInContextAndBits.getPointer() || D == LastDecl));
1407 }
1408
containsDeclAndLoad(Decl * D) const1409 bool DeclContext::containsDeclAndLoad(Decl *D) const {
1410 if (hasExternalLexicalStorage())
1411 LoadLexicalDeclsFromExternalStorage();
1412 return containsDecl(D);
1413 }
1414
1415 /// shouldBeHidden - Determine whether a declaration which was declared
1416 /// within its semantic context should be invisible to qualified name lookup.
shouldBeHidden(NamedDecl * D)1417 static bool shouldBeHidden(NamedDecl *D) {
1418 // Skip unnamed declarations.
1419 if (!D->getDeclName())
1420 return true;
1421
1422 // Skip entities that can't be found by name lookup into a particular
1423 // context.
1424 if ((D->getIdentifierNamespace() == 0 && !isa<UsingDirectiveDecl>(D)) ||
1425 D->isTemplateParameter())
1426 return true;
1427
1428 // Skip friends and local extern declarations unless they're the first
1429 // declaration of the entity.
1430 if ((D->isLocalExternDecl() || D->getFriendObjectKind()) &&
1431 D != D->getCanonicalDecl())
1432 return true;
1433
1434 // Skip template specializations.
1435 // FIXME: This feels like a hack. Should DeclarationName support
1436 // template-ids, or is there a better way to keep specializations
1437 // from being visible?
1438 if (isa<ClassTemplateSpecializationDecl>(D))
1439 return true;
1440 if (auto *FD = dyn_cast<FunctionDecl>(D))
1441 if (FD->isFunctionTemplateSpecialization())
1442 return true;
1443
1444 return false;
1445 }
1446
removeDecl(Decl * D)1447 void DeclContext::removeDecl(Decl *D) {
1448 assert(D->getLexicalDeclContext() == this &&
1449 "decl being removed from non-lexical context");
1450 assert((D->NextInContextAndBits.getPointer() || D == LastDecl) &&
1451 "decl is not in decls list");
1452
1453 // Remove D from the decl chain. This is O(n) but hopefully rare.
1454 if (D == FirstDecl) {
1455 if (D == LastDecl)
1456 FirstDecl = LastDecl = nullptr;
1457 else
1458 FirstDecl = D->NextInContextAndBits.getPointer();
1459 } else {
1460 for (Decl *I = FirstDecl; true; I = I->NextInContextAndBits.getPointer()) {
1461 assert(I && "decl not found in linked list");
1462 if (I->NextInContextAndBits.getPointer() == D) {
1463 I->NextInContextAndBits.setPointer(D->NextInContextAndBits.getPointer());
1464 if (D == LastDecl) LastDecl = I;
1465 break;
1466 }
1467 }
1468 }
1469
1470 // Mark that D is no longer in the decl chain.
1471 D->NextInContextAndBits.setPointer(nullptr);
1472
1473 // Remove D from the lookup table if necessary.
1474 if (isa<NamedDecl>(D)) {
1475 auto *ND = cast<NamedDecl>(D);
1476
1477 // Do not try to remove the declaration if that is invisible to qualified
1478 // lookup. E.g. template specializations are skipped.
1479 if (shouldBeHidden(ND))
1480 return;
1481
1482 // Remove only decls that have a name
1483 if (!ND->getDeclName())
1484 return;
1485
1486 auto *DC = D->getDeclContext();
1487 do {
1488 StoredDeclsMap *Map = DC->getPrimaryContext()->LookupPtr;
1489 if (Map) {
1490 StoredDeclsMap::iterator Pos = Map->find(ND->getDeclName());
1491 assert(Pos != Map->end() && "no lookup entry for decl");
1492 // Remove the decl only if it is contained.
1493 StoredDeclsList::DeclsTy *Vec = Pos->second.getAsVector();
1494 if ((Vec && is_contained(*Vec, ND)) || Pos->second.getAsDecl() == ND)
1495 Pos->second.remove(ND);
1496 }
1497 } while (DC->isTransparentContext() && (DC = DC->getParent()));
1498 }
1499 }
1500
addHiddenDecl(Decl * D)1501 void DeclContext::addHiddenDecl(Decl *D) {
1502 assert(D->getLexicalDeclContext() == this &&
1503 "Decl inserted into wrong lexical context");
1504 assert(!D->getNextDeclInContext() && D != LastDecl &&
1505 "Decl already inserted into a DeclContext");
1506
1507 if (FirstDecl) {
1508 LastDecl->NextInContextAndBits.setPointer(D);
1509 LastDecl = D;
1510 } else {
1511 FirstDecl = LastDecl = D;
1512 }
1513
1514 // Notify a C++ record declaration that we've added a member, so it can
1515 // update its class-specific state.
1516 if (auto *Record = dyn_cast<CXXRecordDecl>(this))
1517 Record->addedMember(D);
1518
1519 // If this is a newly-created (not de-serialized) import declaration, wire
1520 // it in to the list of local import declarations.
1521 if (!D->isFromASTFile()) {
1522 if (auto *Import = dyn_cast<ImportDecl>(D))
1523 D->getASTContext().addedLocalImportDecl(Import);
1524 }
1525 }
1526
addDecl(Decl * D)1527 void DeclContext::addDecl(Decl *D) {
1528 addHiddenDecl(D);
1529
1530 if (auto *ND = dyn_cast<NamedDecl>(D))
1531 ND->getDeclContext()->getPrimaryContext()->
1532 makeDeclVisibleInContextWithFlags(ND, false, true);
1533 }
1534
addDeclInternal(Decl * D)1535 void DeclContext::addDeclInternal(Decl *D) {
1536 addHiddenDecl(D);
1537
1538 if (auto *ND = dyn_cast<NamedDecl>(D))
1539 ND->getDeclContext()->getPrimaryContext()->
1540 makeDeclVisibleInContextWithFlags(ND, true, true);
1541 }
1542
1543 /// buildLookup - Build the lookup data structure with all of the
1544 /// declarations in this DeclContext (and any other contexts linked
1545 /// to it or transparent contexts nested within it) and return it.
1546 ///
1547 /// Note that the produced map may miss out declarations from an
1548 /// external source. If it does, those entries will be marked with
1549 /// the 'hasExternalDecls' flag.
buildLookup()1550 StoredDeclsMap *DeclContext::buildLookup() {
1551 assert(this == getPrimaryContext() && "buildLookup called on non-primary DC");
1552
1553 if (!hasLazyLocalLexicalLookups() &&
1554 !hasLazyExternalLexicalLookups())
1555 return LookupPtr;
1556
1557 SmallVector<DeclContext *, 2> Contexts;
1558 collectAllContexts(Contexts);
1559
1560 if (hasLazyExternalLexicalLookups()) {
1561 setHasLazyExternalLexicalLookups(false);
1562 for (auto *DC : Contexts) {
1563 if (DC->hasExternalLexicalStorage()) {
1564 bool LoadedDecls = DC->LoadLexicalDeclsFromExternalStorage();
1565 setHasLazyLocalLexicalLookups(
1566 hasLazyLocalLexicalLookups() | LoadedDecls );
1567 }
1568 }
1569
1570 if (!hasLazyLocalLexicalLookups())
1571 return LookupPtr;
1572 }
1573
1574 for (auto *DC : Contexts)
1575 buildLookupImpl(DC, hasExternalVisibleStorage());
1576
1577 // We no longer have any lazy decls.
1578 setHasLazyLocalLexicalLookups(false);
1579 return LookupPtr;
1580 }
1581
1582 /// buildLookupImpl - Build part of the lookup data structure for the
1583 /// declarations contained within DCtx, which will either be this
1584 /// DeclContext, a DeclContext linked to it, or a transparent context
1585 /// nested within it.
buildLookupImpl(DeclContext * DCtx,bool Internal)1586 void DeclContext::buildLookupImpl(DeclContext *DCtx, bool Internal) {
1587 for (auto *D : DCtx->noload_decls()) {
1588 // Insert this declaration into the lookup structure, but only if
1589 // it's semantically within its decl context. Any other decls which
1590 // should be found in this context are added eagerly.
1591 //
1592 // If it's from an AST file, don't add it now. It'll get handled by
1593 // FindExternalVisibleDeclsByName if needed. Exception: if we're not
1594 // in C++, we do not track external visible decls for the TU, so in
1595 // that case we need to collect them all here.
1596 if (auto *ND = dyn_cast<NamedDecl>(D))
1597 if (ND->getDeclContext() == DCtx && !shouldBeHidden(ND) &&
1598 (!ND->isFromASTFile() ||
1599 (isTranslationUnit() &&
1600 !getParentASTContext().getLangOpts().CPlusPlus)))
1601 makeDeclVisibleInContextImpl(ND, Internal);
1602
1603 // If this declaration is itself a transparent declaration context
1604 // or inline namespace, add the members of this declaration of that
1605 // context (recursively).
1606 if (auto *InnerCtx = dyn_cast<DeclContext>(D))
1607 if (InnerCtx->isTransparentContext() || InnerCtx->isInlineNamespace())
1608 buildLookupImpl(InnerCtx, Internal);
1609 }
1610 }
1611
1612 NamedDecl *const DeclContextLookupResult::SingleElementDummyList = nullptr;
1613
1614 DeclContext::lookup_result
lookup(DeclarationName Name) const1615 DeclContext::lookup(DeclarationName Name) const {
1616 assert(getDeclKind() != Decl::LinkageSpec &&
1617 getDeclKind() != Decl::Export &&
1618 "should not perform lookups into transparent contexts");
1619
1620 const DeclContext *PrimaryContext = getPrimaryContext();
1621 if (PrimaryContext != this)
1622 return PrimaryContext->lookup(Name);
1623
1624 // If we have an external source, ensure that any later redeclarations of this
1625 // context have been loaded, since they may add names to the result of this
1626 // lookup (or add external visible storage).
1627 ExternalASTSource *Source = getParentASTContext().getExternalSource();
1628 if (Source)
1629 (void)cast<Decl>(this)->getMostRecentDecl();
1630
1631 if (hasExternalVisibleStorage()) {
1632 assert(Source && "external visible storage but no external source?");
1633
1634 if (hasNeedToReconcileExternalVisibleStorage())
1635 reconcileExternalVisibleStorage();
1636
1637 StoredDeclsMap *Map = LookupPtr;
1638
1639 if (hasLazyLocalLexicalLookups() ||
1640 hasLazyExternalLexicalLookups())
1641 // FIXME: Make buildLookup const?
1642 Map = const_cast<DeclContext*>(this)->buildLookup();
1643
1644 if (!Map)
1645 Map = CreateStoredDeclsMap(getParentASTContext());
1646
1647 // If we have a lookup result with no external decls, we are done.
1648 std::pair<StoredDeclsMap::iterator, bool> R =
1649 Map->insert(std::make_pair(Name, StoredDeclsList()));
1650 if (!R.second && !R.first->second.hasExternalDecls())
1651 return R.first->second.getLookupResult();
1652
1653 if (Source->FindExternalVisibleDeclsByName(this, Name) || !R.second) {
1654 if (StoredDeclsMap *Map = LookupPtr) {
1655 StoredDeclsMap::iterator I = Map->find(Name);
1656 if (I != Map->end())
1657 return I->second.getLookupResult();
1658 }
1659 }
1660
1661 return {};
1662 }
1663
1664 StoredDeclsMap *Map = LookupPtr;
1665 if (hasLazyLocalLexicalLookups() ||
1666 hasLazyExternalLexicalLookups())
1667 Map = const_cast<DeclContext*>(this)->buildLookup();
1668
1669 if (!Map)
1670 return {};
1671
1672 StoredDeclsMap::iterator I = Map->find(Name);
1673 if (I == Map->end())
1674 return {};
1675
1676 return I->second.getLookupResult();
1677 }
1678
1679 DeclContext::lookup_result
noload_lookup(DeclarationName Name)1680 DeclContext::noload_lookup(DeclarationName Name) {
1681 assert(getDeclKind() != Decl::LinkageSpec &&
1682 getDeclKind() != Decl::Export &&
1683 "should not perform lookups into transparent contexts");
1684
1685 DeclContext *PrimaryContext = getPrimaryContext();
1686 if (PrimaryContext != this)
1687 return PrimaryContext->noload_lookup(Name);
1688
1689 loadLazyLocalLexicalLookups();
1690 StoredDeclsMap *Map = LookupPtr;
1691 if (!Map)
1692 return {};
1693
1694 StoredDeclsMap::iterator I = Map->find(Name);
1695 return I != Map->end() ? I->second.getLookupResult()
1696 : lookup_result();
1697 }
1698
1699 // If we have any lazy lexical declarations not in our lookup map, add them
1700 // now. Don't import any external declarations, not even if we know we have
1701 // some missing from the external visible lookups.
loadLazyLocalLexicalLookups()1702 void DeclContext::loadLazyLocalLexicalLookups() {
1703 if (hasLazyLocalLexicalLookups()) {
1704 SmallVector<DeclContext *, 2> Contexts;
1705 collectAllContexts(Contexts);
1706 for (auto *Context : Contexts)
1707 buildLookupImpl(Context, hasExternalVisibleStorage());
1708 setHasLazyLocalLexicalLookups(false);
1709 }
1710 }
1711
localUncachedLookup(DeclarationName Name,SmallVectorImpl<NamedDecl * > & Results)1712 void DeclContext::localUncachedLookup(DeclarationName Name,
1713 SmallVectorImpl<NamedDecl *> &Results) {
1714 Results.clear();
1715
1716 // If there's no external storage, just perform a normal lookup and copy
1717 // the results.
1718 if (!hasExternalVisibleStorage() && !hasExternalLexicalStorage() && Name) {
1719 lookup_result LookupResults = lookup(Name);
1720 Results.insert(Results.end(), LookupResults.begin(), LookupResults.end());
1721 return;
1722 }
1723
1724 // If we have a lookup table, check there first. Maybe we'll get lucky.
1725 // FIXME: Should we be checking these flags on the primary context?
1726 if (Name && !hasLazyLocalLexicalLookups() &&
1727 !hasLazyExternalLexicalLookups()) {
1728 if (StoredDeclsMap *Map = LookupPtr) {
1729 StoredDeclsMap::iterator Pos = Map->find(Name);
1730 if (Pos != Map->end()) {
1731 Results.insert(Results.end(),
1732 Pos->second.getLookupResult().begin(),
1733 Pos->second.getLookupResult().end());
1734 return;
1735 }
1736 }
1737 }
1738
1739 // Slow case: grovel through the declarations in our chain looking for
1740 // matches.
1741 // FIXME: If we have lazy external declarations, this will not find them!
1742 // FIXME: Should we CollectAllContexts and walk them all here?
1743 for (Decl *D = FirstDecl; D; D = D->getNextDeclInContext()) {
1744 if (auto *ND = dyn_cast<NamedDecl>(D))
1745 if (ND->getDeclName() == Name)
1746 Results.push_back(ND);
1747 }
1748 }
1749
getRedeclContext()1750 DeclContext *DeclContext::getRedeclContext() {
1751 DeclContext *Ctx = this;
1752
1753 // In C, a record type is the redeclaration context for its fields only. If
1754 // we arrive at a record context after skipping anything else, we should skip
1755 // the record as well. Currently, this means skipping enumerations because
1756 // they're the only transparent context that can exist within a struct or
1757 // union.
1758 bool SkipRecords = getDeclKind() == Decl::Kind::Enum &&
1759 !getParentASTContext().getLangOpts().CPlusPlus;
1760
1761 // Skip through contexts to get to the redeclaration context. Transparent
1762 // contexts are always skipped.
1763 while ((SkipRecords && Ctx->isRecord()) || Ctx->isTransparentContext())
1764 Ctx = Ctx->getParent();
1765 return Ctx;
1766 }
1767
getEnclosingNamespaceContext()1768 DeclContext *DeclContext::getEnclosingNamespaceContext() {
1769 DeclContext *Ctx = this;
1770 // Skip through non-namespace, non-translation-unit contexts.
1771 while (!Ctx->isFileContext())
1772 Ctx = Ctx->getParent();
1773 return Ctx->getPrimaryContext();
1774 }
1775
getOuterLexicalRecordContext()1776 RecordDecl *DeclContext::getOuterLexicalRecordContext() {
1777 // Loop until we find a non-record context.
1778 RecordDecl *OutermostRD = nullptr;
1779 DeclContext *DC = this;
1780 while (DC->isRecord()) {
1781 OutermostRD = cast<RecordDecl>(DC);
1782 DC = DC->getLexicalParent();
1783 }
1784 return OutermostRD;
1785 }
1786
InEnclosingNamespaceSetOf(const DeclContext * O) const1787 bool DeclContext::InEnclosingNamespaceSetOf(const DeclContext *O) const {
1788 // For non-file contexts, this is equivalent to Equals.
1789 if (!isFileContext())
1790 return O->Equals(this);
1791
1792 do {
1793 if (O->Equals(this))
1794 return true;
1795
1796 const auto *NS = dyn_cast<NamespaceDecl>(O);
1797 if (!NS || !NS->isInline())
1798 break;
1799 O = NS->getParent();
1800 } while (O);
1801
1802 return false;
1803 }
1804
makeDeclVisibleInContext(NamedDecl * D)1805 void DeclContext::makeDeclVisibleInContext(NamedDecl *D) {
1806 DeclContext *PrimaryDC = this->getPrimaryContext();
1807 DeclContext *DeclDC = D->getDeclContext()->getPrimaryContext();
1808 // If the decl is being added outside of its semantic decl context, we
1809 // need to ensure that we eagerly build the lookup information for it.
1810 PrimaryDC->makeDeclVisibleInContextWithFlags(D, false, PrimaryDC == DeclDC);
1811 }
1812
makeDeclVisibleInContextWithFlags(NamedDecl * D,bool Internal,bool Recoverable)1813 void DeclContext::makeDeclVisibleInContextWithFlags(NamedDecl *D, bool Internal,
1814 bool Recoverable) {
1815 assert(this == getPrimaryContext() && "expected a primary DC");
1816
1817 if (!isLookupContext()) {
1818 if (isTransparentContext())
1819 getParent()->getPrimaryContext()
1820 ->makeDeclVisibleInContextWithFlags(D, Internal, Recoverable);
1821 return;
1822 }
1823
1824 // Skip declarations which should be invisible to name lookup.
1825 if (shouldBeHidden(D))
1826 return;
1827
1828 // If we already have a lookup data structure, perform the insertion into
1829 // it. If we might have externally-stored decls with this name, look them
1830 // up and perform the insertion. If this decl was declared outside its
1831 // semantic context, buildLookup won't add it, so add it now.
1832 //
1833 // FIXME: As a performance hack, don't add such decls into the translation
1834 // unit unless we're in C++, since qualified lookup into the TU is never
1835 // performed.
1836 if (LookupPtr || hasExternalVisibleStorage() ||
1837 ((!Recoverable || D->getDeclContext() != D->getLexicalDeclContext()) &&
1838 (getParentASTContext().getLangOpts().CPlusPlus ||
1839 !isTranslationUnit()))) {
1840 // If we have lazily omitted any decls, they might have the same name as
1841 // the decl which we are adding, so build a full lookup table before adding
1842 // this decl.
1843 buildLookup();
1844 makeDeclVisibleInContextImpl(D, Internal);
1845 } else {
1846 setHasLazyLocalLexicalLookups(true);
1847 }
1848
1849 // If we are a transparent context or inline namespace, insert into our
1850 // parent context, too. This operation is recursive.
1851 if (isTransparentContext() || isInlineNamespace())
1852 getParent()->getPrimaryContext()->
1853 makeDeclVisibleInContextWithFlags(D, Internal, Recoverable);
1854
1855 auto *DCAsDecl = cast<Decl>(this);
1856 // Notify that a decl was made visible unless we are a Tag being defined.
1857 if (!(isa<TagDecl>(DCAsDecl) && cast<TagDecl>(DCAsDecl)->isBeingDefined()))
1858 if (ASTMutationListener *L = DCAsDecl->getASTMutationListener())
1859 L->AddedVisibleDecl(this, D);
1860 }
1861
makeDeclVisibleInContextImpl(NamedDecl * D,bool Internal)1862 void DeclContext::makeDeclVisibleInContextImpl(NamedDecl *D, bool Internal) {
1863 // Find or create the stored declaration map.
1864 StoredDeclsMap *Map = LookupPtr;
1865 if (!Map) {
1866 ASTContext *C = &getParentASTContext();
1867 Map = CreateStoredDeclsMap(*C);
1868 }
1869
1870 // If there is an external AST source, load any declarations it knows about
1871 // with this declaration's name.
1872 // If the lookup table contains an entry about this name it means that we
1873 // have already checked the external source.
1874 if (!Internal)
1875 if (ExternalASTSource *Source = getParentASTContext().getExternalSource())
1876 if (hasExternalVisibleStorage() &&
1877 Map->find(D->getDeclName()) == Map->end())
1878 Source->FindExternalVisibleDeclsByName(this, D->getDeclName());
1879
1880 // Insert this declaration into the map.
1881 StoredDeclsList &DeclNameEntries = (*Map)[D->getDeclName()];
1882
1883 if (Internal) {
1884 // If this is being added as part of loading an external declaration,
1885 // this may not be the only external declaration with this name.
1886 // In this case, we never try to replace an existing declaration; we'll
1887 // handle that when we finalize the list of declarations for this name.
1888 DeclNameEntries.setHasExternalDecls();
1889 DeclNameEntries.AddSubsequentDecl(D);
1890 return;
1891 }
1892
1893 if (DeclNameEntries.isNull()) {
1894 DeclNameEntries.setOnlyValue(D);
1895 return;
1896 }
1897
1898 if (DeclNameEntries.HandleRedeclaration(D, /*IsKnownNewer*/!Internal)) {
1899 // This declaration has replaced an existing one for which
1900 // declarationReplaces returns true.
1901 return;
1902 }
1903
1904 // Put this declaration into the appropriate slot.
1905 DeclNameEntries.AddSubsequentDecl(D);
1906 }
1907
operator *() const1908 UsingDirectiveDecl *DeclContext::udir_iterator::operator*() const {
1909 return cast<UsingDirectiveDecl>(*I);
1910 }
1911
1912 /// Returns iterator range [First, Last) of UsingDirectiveDecls stored within
1913 /// this context.
using_directives() const1914 DeclContext::udir_range DeclContext::using_directives() const {
1915 // FIXME: Use something more efficient than normal lookup for using
1916 // directives. In C++, using directives are looked up more than anything else.
1917 lookup_result Result = lookup(UsingDirectiveDecl::getName());
1918 return udir_range(Result.begin(), Result.end());
1919 }
1920
1921 //===----------------------------------------------------------------------===//
1922 // Creation and Destruction of StoredDeclsMaps. //
1923 //===----------------------------------------------------------------------===//
1924
CreateStoredDeclsMap(ASTContext & C) const1925 StoredDeclsMap *DeclContext::CreateStoredDeclsMap(ASTContext &C) const {
1926 assert(!LookupPtr && "context already has a decls map");
1927 assert(getPrimaryContext() == this &&
1928 "creating decls map on non-primary context");
1929
1930 StoredDeclsMap *M;
1931 bool Dependent = isDependentContext();
1932 if (Dependent)
1933 M = new DependentStoredDeclsMap();
1934 else
1935 M = new StoredDeclsMap();
1936 M->Previous = C.LastSDM;
1937 C.LastSDM = llvm::PointerIntPair<StoredDeclsMap*,1>(M, Dependent);
1938 LookupPtr = M;
1939 return M;
1940 }
1941
ReleaseDeclContextMaps()1942 void ASTContext::ReleaseDeclContextMaps() {
1943 // It's okay to delete DependentStoredDeclsMaps via a StoredDeclsMap
1944 // pointer because the subclass doesn't add anything that needs to
1945 // be deleted.
1946 StoredDeclsMap::DestroyAll(LastSDM.getPointer(), LastSDM.getInt());
1947 }
1948
DestroyAll(StoredDeclsMap * Map,bool Dependent)1949 void StoredDeclsMap::DestroyAll(StoredDeclsMap *Map, bool Dependent) {
1950 while (Map) {
1951 // Advance the iteration before we invalidate memory.
1952 llvm::PointerIntPair<StoredDeclsMap*,1> Next = Map->Previous;
1953
1954 if (Dependent)
1955 delete static_cast<DependentStoredDeclsMap*>(Map);
1956 else
1957 delete Map;
1958
1959 Map = Next.getPointer();
1960 Dependent = Next.getInt();
1961 }
1962 }
1963
Create(ASTContext & C,DeclContext * Parent,const PartialDiagnostic & PDiag)1964 DependentDiagnostic *DependentDiagnostic::Create(ASTContext &C,
1965 DeclContext *Parent,
1966 const PartialDiagnostic &PDiag) {
1967 assert(Parent->isDependentContext()
1968 && "cannot iterate dependent diagnostics of non-dependent context");
1969 Parent = Parent->getPrimaryContext();
1970 if (!Parent->LookupPtr)
1971 Parent->CreateStoredDeclsMap(C);
1972
1973 auto *Map = static_cast<DependentStoredDeclsMap *>(Parent->LookupPtr);
1974
1975 // Allocate the copy of the PartialDiagnostic via the ASTContext's
1976 // BumpPtrAllocator, rather than the ASTContext itself.
1977 PartialDiagnostic::Storage *DiagStorage = nullptr;
1978 if (PDiag.hasStorage())
1979 DiagStorage = new (C) PartialDiagnostic::Storage;
1980
1981 auto *DD = new (C) DependentDiagnostic(PDiag, DiagStorage);
1982
1983 // TODO: Maybe we shouldn't reverse the order during insertion.
1984 DD->NextDiagnostic = Map->FirstDiagnostic;
1985 Map->FirstDiagnostic = DD;
1986
1987 return DD;
1988 }
1989