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 63 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 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 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 } 113 114 Module *Decl::getOwningModuleSlow() const { 115 assert(isFromASTFile() && "Not from AST file?"); 116 return getASTContext().getExternalSource()->getModule(getOwningModuleID()); 117 } 118 119 bool Decl::hasLocalOwningModuleStorage() const { 120 return getASTContext().getLangOpts().trackLocalOwningModule(); 121 } 122 123 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 } 131 132 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 } 154 155 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; 165 void Decl::EnableStatistics() { 166 StatisticsEnabled = true; 167 } 168 169 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 } 192 193 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 } 200 201 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 } 210 211 bool Decl::isParameterPack() const { 212 if (const auto *Var = dyn_cast<VarDecl>(this)) 213 return Var->isParameterPack(); 214 215 return isTemplateParameterPack(); 216 } 217 218 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 } 225 226 bool Decl::isTemplateDecl() const { 227 return isa<TemplateDecl>(this); 228 } 229 230 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 } 242 243 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 } 253 254 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 //===----------------------------------------------------------------------===// 267 268 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; 294 295 void Decl::setDeclContext(DeclContext *DC) { 296 DeclCtx = DC; 297 } 298 299 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 } 322 323 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 } 334 335 bool Decl::isLexicallyWithinFunctionOrMethod() 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 LDC = LDC->getLexicalParent(); 343 } 344 return false; 345 } 346 347 bool Decl::isInAnonymousNamespace() const { 348 for (const DeclContext *DC = getDeclContext(); DC; DC = DC->getParent()) { 349 if (const auto *ND = dyn_cast<NamespaceDecl>(DC)) 350 if (ND->isAnonymousNamespace()) 351 return true; 352 } 353 354 return false; 355 } 356 357 bool Decl::isInStdNamespace() const { 358 const DeclContext *DC = getDeclContext(); 359 return DC && DC->isStdNamespace(); 360 } 361 362 TranslationUnitDecl *Decl::getTranslationUnitDecl() { 363 if (auto *TUD = dyn_cast<TranslationUnitDecl>(this)) 364 return TUD; 365 366 DeclContext *DC = getDeclContext(); 367 assert(DC && "This decl is not contained in a translation unit!"); 368 369 while (!DC->isTranslationUnit()) { 370 DC = DC->getParent(); 371 assert(DC && "This decl is not contained in a translation unit!"); 372 } 373 374 return cast<TranslationUnitDecl>(DC); 375 } 376 377 ASTContext &Decl::getASTContext() const { 378 return getTranslationUnitDecl()->getASTContext(); 379 } 380 381 ASTMutationListener *Decl::getASTMutationListener() const { 382 return getASTContext().getASTMutationListener(); 383 } 384 385 unsigned Decl::getMaxAlignment() const { 386 if (!hasAttrs()) 387 return 0; 388 389 unsigned Align = 0; 390 const AttrVec &V = getAttrs(); 391 ASTContext &Ctx = getASTContext(); 392 specific_attr_iterator<AlignedAttr> I(V.begin()), E(V.end()); 393 for (; I != E; ++I) 394 Align = std::max(Align, I->getAlignment(Ctx)); 395 return Align; 396 } 397 398 bool Decl::isUsed(bool CheckUsedAttr) const { 399 const Decl *CanonD = getCanonicalDecl(); 400 if (CanonD->Used) 401 return true; 402 403 // Check for used attribute. 404 // Ask the most recent decl, since attributes accumulate in the redecl chain. 405 if (CheckUsedAttr && getMostRecentDecl()->hasAttr<UsedAttr>()) 406 return true; 407 408 // The information may have not been deserialized yet. Force deserialization 409 // to complete the needed information. 410 return getMostRecentDecl()->getCanonicalDecl()->Used; 411 } 412 413 void Decl::markUsed(ASTContext &C) { 414 if (isUsed(false)) 415 return; 416 417 if (C.getASTMutationListener()) 418 C.getASTMutationListener()->DeclarationMarkedUsed(this); 419 420 setIsUsed(); 421 } 422 423 bool Decl::isReferenced() const { 424 if (Referenced) 425 return true; 426 427 // Check redeclarations. 428 for (const auto *I : redecls()) 429 if (I->Referenced) 430 return true; 431 432 return false; 433 } 434 435 ExternalSourceSymbolAttr *Decl::getExternalSourceSymbolAttr() const { 436 const Decl *Definition = nullptr; 437 if (auto *ID = dyn_cast<ObjCInterfaceDecl>(this)) { 438 Definition = ID->getDefinition(); 439 } else if (auto *PD = dyn_cast<ObjCProtocolDecl>(this)) { 440 Definition = PD->getDefinition(); 441 } else if (auto *TD = dyn_cast<TagDecl>(this)) { 442 Definition = TD->getDefinition(); 443 } 444 if (!Definition) 445 Definition = this; 446 447 if (auto *attr = Definition->getAttr<ExternalSourceSymbolAttr>()) 448 return attr; 449 if (auto *dcd = dyn_cast<Decl>(getDeclContext())) { 450 return dcd->getAttr<ExternalSourceSymbolAttr>(); 451 } 452 453 return nullptr; 454 } 455 456 bool Decl::hasDefiningAttr() const { 457 return hasAttr<AliasAttr>() || hasAttr<IFuncAttr>(); 458 } 459 460 const Attr *Decl::getDefiningAttr() const { 461 if (auto *AA = getAttr<AliasAttr>()) 462 return AA; 463 if (auto *IFA = getAttr<IFuncAttr>()) 464 return IFA; 465 return nullptr; 466 } 467 468 static StringRef getRealizedPlatform(const AvailabilityAttr *A, 469 const ASTContext &Context) { 470 // Check if this is an App Extension "platform", and if so chop off 471 // the suffix for matching with the actual platform. 472 StringRef RealizedPlatform = A->getPlatform()->getName(); 473 if (!Context.getLangOpts().AppExt) 474 return RealizedPlatform; 475 size_t suffix = RealizedPlatform.rfind("_app_extension"); 476 if (suffix != StringRef::npos) 477 return RealizedPlatform.slice(0, suffix); 478 return RealizedPlatform; 479 } 480 481 /// Determine the availability of the given declaration based on 482 /// the target platform. 483 /// 484 /// When it returns an availability result other than \c AR_Available, 485 /// if the \p Message parameter is non-NULL, it will be set to a 486 /// string describing why the entity is unavailable. 487 /// 488 /// FIXME: Make these strings localizable, since they end up in 489 /// diagnostics. 490 static AvailabilityResult CheckAvailability(ASTContext &Context, 491 const AvailabilityAttr *A, 492 std::string *Message, 493 VersionTuple EnclosingVersion) { 494 if (EnclosingVersion.empty()) 495 EnclosingVersion = Context.getTargetInfo().getPlatformMinVersion(); 496 497 if (EnclosingVersion.empty()) 498 return AR_Available; 499 500 StringRef ActualPlatform = A->getPlatform()->getName(); 501 StringRef TargetPlatform = Context.getTargetInfo().getPlatformName(); 502 503 // Match the platform name. 504 if (getRealizedPlatform(A, Context) != TargetPlatform) 505 return AR_Available; 506 507 StringRef PrettyPlatformName 508 = AvailabilityAttr::getPrettyPlatformName(ActualPlatform); 509 510 if (PrettyPlatformName.empty()) 511 PrettyPlatformName = ActualPlatform; 512 513 std::string HintMessage; 514 if (!A->getMessage().empty()) { 515 HintMessage = " - "; 516 HintMessage += A->getMessage(); 517 } 518 519 // Make sure that this declaration has not been marked 'unavailable'. 520 if (A->getUnavailable()) { 521 if (Message) { 522 Message->clear(); 523 llvm::raw_string_ostream Out(*Message); 524 Out << "not available on " << PrettyPlatformName 525 << HintMessage; 526 } 527 528 return AR_Unavailable; 529 } 530 531 // Make sure that this declaration has already been introduced. 532 if (!A->getIntroduced().empty() && 533 EnclosingVersion < A->getIntroduced()) { 534 if (Message) { 535 Message->clear(); 536 llvm::raw_string_ostream Out(*Message); 537 VersionTuple VTI(A->getIntroduced()); 538 Out << "introduced in " << PrettyPlatformName << ' ' 539 << VTI << HintMessage; 540 } 541 542 return A->getStrict() ? AR_Unavailable : AR_NotYetIntroduced; 543 } 544 545 // Make sure that this declaration hasn't been obsoleted. 546 if (!A->getObsoleted().empty() && EnclosingVersion >= A->getObsoleted()) { 547 if (Message) { 548 Message->clear(); 549 llvm::raw_string_ostream Out(*Message); 550 VersionTuple VTO(A->getObsoleted()); 551 Out << "obsoleted in " << PrettyPlatformName << ' ' 552 << VTO << HintMessage; 553 } 554 555 return AR_Unavailable; 556 } 557 558 // Make sure that this declaration hasn't been deprecated. 559 if (!A->getDeprecated().empty() && EnclosingVersion >= A->getDeprecated()) { 560 if (Message) { 561 Message->clear(); 562 llvm::raw_string_ostream Out(*Message); 563 VersionTuple VTD(A->getDeprecated()); 564 Out << "first deprecated in " << PrettyPlatformName << ' ' 565 << VTD << HintMessage; 566 } 567 568 return AR_Deprecated; 569 } 570 571 return AR_Available; 572 } 573 574 AvailabilityResult Decl::getAvailability(std::string *Message, 575 VersionTuple EnclosingVersion, 576 StringRef *RealizedPlatform) const { 577 if (auto *FTD = dyn_cast<FunctionTemplateDecl>(this)) 578 return FTD->getTemplatedDecl()->getAvailability(Message, EnclosingVersion, 579 RealizedPlatform); 580 581 AvailabilityResult Result = AR_Available; 582 std::string ResultMessage; 583 584 for (const auto *A : attrs()) { 585 if (const auto *Deprecated = dyn_cast<DeprecatedAttr>(A)) { 586 if (Result >= AR_Deprecated) 587 continue; 588 589 if (Message) 590 ResultMessage = Deprecated->getMessage(); 591 592 Result = AR_Deprecated; 593 continue; 594 } 595 596 if (const auto *Unavailable = dyn_cast<UnavailableAttr>(A)) { 597 if (Message) 598 *Message = Unavailable->getMessage(); 599 return AR_Unavailable; 600 } 601 602 if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) { 603 AvailabilityResult AR = CheckAvailability(getASTContext(), Availability, 604 Message, EnclosingVersion); 605 606 if (AR == AR_Unavailable) { 607 if (RealizedPlatform) 608 *RealizedPlatform = Availability->getPlatform()->getName(); 609 return AR_Unavailable; 610 } 611 612 if (AR > Result) { 613 Result = AR; 614 if (Message) 615 ResultMessage.swap(*Message); 616 } 617 continue; 618 } 619 } 620 621 if (Message) 622 Message->swap(ResultMessage); 623 return Result; 624 } 625 626 VersionTuple Decl::getVersionIntroduced() const { 627 const ASTContext &Context = getASTContext(); 628 StringRef TargetPlatform = Context.getTargetInfo().getPlatformName(); 629 for (const auto *A : attrs()) { 630 if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) { 631 if (getRealizedPlatform(Availability, Context) != TargetPlatform) 632 continue; 633 if (!Availability->getIntroduced().empty()) 634 return Availability->getIntroduced(); 635 } 636 } 637 return {}; 638 } 639 640 bool Decl::canBeWeakImported(bool &IsDefinition) const { 641 IsDefinition = false; 642 643 // Variables, if they aren't definitions. 644 if (const auto *Var = dyn_cast<VarDecl>(this)) { 645 if (Var->isThisDeclarationADefinition()) { 646 IsDefinition = true; 647 return false; 648 } 649 return true; 650 651 // Functions, if they aren't definitions. 652 } else if (const auto *FD = dyn_cast<FunctionDecl>(this)) { 653 if (FD->hasBody()) { 654 IsDefinition = true; 655 return false; 656 } 657 return true; 658 659 // Objective-C classes, if this is the non-fragile runtime. 660 } else if (isa<ObjCInterfaceDecl>(this) && 661 getASTContext().getLangOpts().ObjCRuntime.hasWeakClassImport()) { 662 return true; 663 664 // Nothing else. 665 } else { 666 return false; 667 } 668 } 669 670 bool Decl::isWeakImported() const { 671 bool IsDefinition; 672 if (!canBeWeakImported(IsDefinition)) 673 return false; 674 675 for (const auto *A : attrs()) { 676 if (isa<WeakImportAttr>(A)) 677 return true; 678 679 if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) { 680 if (CheckAvailability(getASTContext(), Availability, nullptr, 681 VersionTuple()) == AR_NotYetIntroduced) 682 return true; 683 } 684 } 685 686 return false; 687 } 688 689 unsigned Decl::getIdentifierNamespaceForKind(Kind DeclKind) { 690 switch (DeclKind) { 691 case Function: 692 case CXXDeductionGuide: 693 case CXXMethod: 694 case CXXConstructor: 695 case ConstructorUsingShadow: 696 case CXXDestructor: 697 case CXXConversion: 698 case EnumConstant: 699 case Var: 700 case ImplicitParam: 701 case ParmVar: 702 case ObjCMethod: 703 case ObjCProperty: 704 case MSProperty: 705 return IDNS_Ordinary; 706 case Label: 707 return IDNS_Label; 708 case IndirectField: 709 return IDNS_Ordinary | IDNS_Member; 710 711 case Binding: 712 case NonTypeTemplateParm: 713 case VarTemplate: 714 case Concept: 715 // These (C++-only) declarations are found by redeclaration lookup for 716 // tag types, so we include them in the tag namespace. 717 return IDNS_Ordinary | IDNS_Tag; 718 719 case ObjCCompatibleAlias: 720 case ObjCInterface: 721 return IDNS_Ordinary | IDNS_Type; 722 723 case Typedef: 724 case TypeAlias: 725 case TemplateTypeParm: 726 case ObjCTypeParam: 727 return IDNS_Ordinary | IDNS_Type; 728 729 case UnresolvedUsingTypename: 730 return IDNS_Ordinary | IDNS_Type | IDNS_Using; 731 732 case UsingShadow: 733 return 0; // we'll actually overwrite this later 734 735 case UnresolvedUsingValue: 736 return IDNS_Ordinary | IDNS_Using; 737 738 case Using: 739 case UsingPack: 740 return IDNS_Using; 741 742 case ObjCProtocol: 743 return IDNS_ObjCProtocol; 744 745 case Field: 746 case ObjCAtDefsField: 747 case ObjCIvar: 748 return IDNS_Member; 749 750 case Record: 751 case CXXRecord: 752 case Enum: 753 return IDNS_Tag | IDNS_Type; 754 755 case Namespace: 756 case NamespaceAlias: 757 return IDNS_Namespace; 758 759 case FunctionTemplate: 760 return IDNS_Ordinary; 761 762 case ClassTemplate: 763 case TemplateTemplateParm: 764 case TypeAliasTemplate: 765 return IDNS_Ordinary | IDNS_Tag | IDNS_Type; 766 767 case OMPDeclareReduction: 768 return IDNS_OMPReduction; 769 770 case OMPDeclareMapper: 771 return IDNS_OMPMapper; 772 773 // Never have names. 774 case Friend: 775 case FriendTemplate: 776 case AccessSpec: 777 case LinkageSpec: 778 case Export: 779 case FileScopeAsm: 780 case StaticAssert: 781 case ObjCPropertyImpl: 782 case PragmaComment: 783 case PragmaDetectMismatch: 784 case Block: 785 case Captured: 786 case TranslationUnit: 787 case ExternCContext: 788 case Decomposition: 789 790 case UsingDirective: 791 case BuiltinTemplate: 792 case ClassTemplateSpecialization: 793 case ClassTemplatePartialSpecialization: 794 case ClassScopeFunctionSpecialization: 795 case VarTemplateSpecialization: 796 case VarTemplatePartialSpecialization: 797 case ObjCImplementation: 798 case ObjCCategory: 799 case ObjCCategoryImpl: 800 case Import: 801 case OMPThreadPrivate: 802 case OMPAllocate: 803 case OMPRequires: 804 case OMPCapturedExpr: 805 case Empty: 806 // Never looked up by name. 807 return 0; 808 } 809 810 llvm_unreachable("Invalid DeclKind!"); 811 } 812 813 void Decl::setAttrsImpl(const AttrVec &attrs, ASTContext &Ctx) { 814 assert(!HasAttrs && "Decl already contains attrs."); 815 816 AttrVec &AttrBlank = Ctx.getDeclAttrs(this); 817 assert(AttrBlank.empty() && "HasAttrs was wrong?"); 818 819 AttrBlank = attrs; 820 HasAttrs = true; 821 } 822 823 void Decl::dropAttrs() { 824 if (!HasAttrs) return; 825 826 HasAttrs = false; 827 getASTContext().eraseDeclAttrs(this); 828 } 829 830 void Decl::addAttr(Attr *A) { 831 if (!hasAttrs()) { 832 setAttrs(AttrVec(1, A)); 833 return; 834 } 835 836 AttrVec &Attrs = getAttrs(); 837 if (!A->isInherited()) { 838 Attrs.push_back(A); 839 return; 840 } 841 842 // Attribute inheritance is processed after attribute parsing. To keep the 843 // order as in the source code, add inherited attributes before non-inherited 844 // ones. 845 auto I = Attrs.begin(), E = Attrs.end(); 846 for (; I != E; ++I) { 847 if (!(*I)->isInherited()) 848 break; 849 } 850 Attrs.insert(I, A); 851 } 852 853 const AttrVec &Decl::getAttrs() const { 854 assert(HasAttrs && "No attrs to get!"); 855 return getASTContext().getDeclAttrs(this); 856 } 857 858 Decl *Decl::castFromDeclContext (const DeclContext *D) { 859 Decl::Kind DK = D->getDeclKind(); 860 switch(DK) { 861 #define DECL(NAME, BASE) 862 #define DECL_CONTEXT(NAME) \ 863 case Decl::NAME: \ 864 return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D)); 865 #define DECL_CONTEXT_BASE(NAME) 866 #include "clang/AST/DeclNodes.inc" 867 default: 868 #define DECL(NAME, BASE) 869 #define DECL_CONTEXT_BASE(NAME) \ 870 if (DK >= first##NAME && DK <= last##NAME) \ 871 return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D)); 872 #include "clang/AST/DeclNodes.inc" 873 llvm_unreachable("a decl that inherits DeclContext isn't handled"); 874 } 875 } 876 877 DeclContext *Decl::castToDeclContext(const Decl *D) { 878 Decl::Kind DK = D->getKind(); 879 switch(DK) { 880 #define DECL(NAME, BASE) 881 #define DECL_CONTEXT(NAME) \ 882 case Decl::NAME: \ 883 return static_cast<NAME##Decl *>(const_cast<Decl *>(D)); 884 #define DECL_CONTEXT_BASE(NAME) 885 #include "clang/AST/DeclNodes.inc" 886 default: 887 #define DECL(NAME, BASE) 888 #define DECL_CONTEXT_BASE(NAME) \ 889 if (DK >= first##NAME && DK <= last##NAME) \ 890 return static_cast<NAME##Decl *>(const_cast<Decl *>(D)); 891 #include "clang/AST/DeclNodes.inc" 892 llvm_unreachable("a decl that inherits DeclContext isn't handled"); 893 } 894 } 895 896 SourceLocation Decl::getBodyRBrace() const { 897 // Special handling of FunctionDecl to avoid de-serializing the body from PCH. 898 // FunctionDecl stores EndRangeLoc for this purpose. 899 if (const auto *FD = dyn_cast<FunctionDecl>(this)) { 900 const FunctionDecl *Definition; 901 if (FD->hasBody(Definition)) 902 return Definition->getSourceRange().getEnd(); 903 return {}; 904 } 905 906 if (Stmt *Body = getBody()) 907 return Body->getSourceRange().getEnd(); 908 909 return {}; 910 } 911 912 bool Decl::AccessDeclContextSanity() const { 913 #ifndef NDEBUG 914 // Suppress this check if any of the following hold: 915 // 1. this is the translation unit (and thus has no parent) 916 // 2. this is a template parameter (and thus doesn't belong to its context) 917 // 3. this is a non-type template parameter 918 // 4. the context is not a record 919 // 5. it's invalid 920 // 6. it's a C++0x static_assert. 921 // 7. it's a block literal declaration 922 if (isa<TranslationUnitDecl>(this) || 923 isa<TemplateTypeParmDecl>(this) || 924 isa<NonTypeTemplateParmDecl>(this) || 925 !getDeclContext() || 926 !isa<CXXRecordDecl>(getDeclContext()) || 927 isInvalidDecl() || 928 isa<StaticAssertDecl>(this) || 929 isa<BlockDecl>(this) || 930 // FIXME: a ParmVarDecl can have ClassTemplateSpecialization 931 // as DeclContext (?). 932 isa<ParmVarDecl>(this) || 933 // FIXME: a ClassTemplateSpecialization or CXXRecordDecl can have 934 // AS_none as access specifier. 935 isa<CXXRecordDecl>(this) || 936 isa<ClassScopeFunctionSpecializationDecl>(this)) 937 return true; 938 939 assert(Access != AS_none && 940 "Access specifier is AS_none inside a record decl"); 941 #endif 942 return true; 943 } 944 945 static Decl::Kind getKind(const Decl *D) { return D->getKind(); } 946 static Decl::Kind getKind(const DeclContext *DC) { return DC->getDeclKind(); } 947 948 int64_t Decl::getID() const { 949 return getASTContext().getAllocator().identifyKnownAlignedObject<Decl>(this); 950 } 951 952 const FunctionType *Decl::getFunctionType(bool BlocksToo) const { 953 QualType Ty; 954 if (const auto *D = dyn_cast<ValueDecl>(this)) 955 Ty = D->getType(); 956 else if (const auto *D = dyn_cast<TypedefNameDecl>(this)) 957 Ty = D->getUnderlyingType(); 958 else 959 return nullptr; 960 961 if (Ty->isFunctionPointerType()) 962 Ty = Ty->castAs<PointerType>()->getPointeeType(); 963 else if (Ty->isFunctionReferenceType()) 964 Ty = Ty->castAs<ReferenceType>()->getPointeeType(); 965 else if (BlocksToo && Ty->isBlockPointerType()) 966 Ty = Ty->castAs<BlockPointerType>()->getPointeeType(); 967 968 return Ty->getAs<FunctionType>(); 969 } 970 971 /// Starting at a given context (a Decl or DeclContext), look for a 972 /// code context that is not a closure (a lambda, block, etc.). 973 template <class T> static Decl *getNonClosureContext(T *D) { 974 if (getKind(D) == Decl::CXXMethod) { 975 auto *MD = cast<CXXMethodDecl>(D); 976 if (MD->getOverloadedOperator() == OO_Call && 977 MD->getParent()->isLambda()) 978 return getNonClosureContext(MD->getParent()->getParent()); 979 return MD; 980 } else if (auto *FD = dyn_cast<FunctionDecl>(D)) 981 return FD; 982 else if (auto *MD = dyn_cast<ObjCMethodDecl>(D)) 983 return MD; 984 else if (auto *BD = dyn_cast<BlockDecl>(D)) 985 return getNonClosureContext(BD->getParent()); 986 else if (auto *CD = dyn_cast<CapturedDecl>(D)) 987 return getNonClosureContext(CD->getParent()); 988 else 989 return nullptr; 990 } 991 992 Decl *Decl::getNonClosureContext() { 993 return ::getNonClosureContext(this); 994 } 995 996 Decl *DeclContext::getNonClosureAncestor() { 997 return ::getNonClosureContext(this); 998 } 999 1000 //===----------------------------------------------------------------------===// 1001 // DeclContext Implementation 1002 //===----------------------------------------------------------------------===// 1003 1004 DeclContext::DeclContext(Decl::Kind K) { 1005 DeclContextBits.DeclKind = K; 1006 setHasExternalLexicalStorage(false); 1007 setHasExternalVisibleStorage(false); 1008 setNeedToReconcileExternalVisibleStorage(false); 1009 setHasLazyLocalLexicalLookups(false); 1010 setHasLazyExternalLexicalLookups(false); 1011 setUseQualifiedLookup(false); 1012 } 1013 1014 bool DeclContext::classof(const Decl *D) { 1015 switch (D->getKind()) { 1016 #define DECL(NAME, BASE) 1017 #define DECL_CONTEXT(NAME) case Decl::NAME: 1018 #define DECL_CONTEXT_BASE(NAME) 1019 #include "clang/AST/DeclNodes.inc" 1020 return true; 1021 default: 1022 #define DECL(NAME, BASE) 1023 #define DECL_CONTEXT_BASE(NAME) \ 1024 if (D->getKind() >= Decl::first##NAME && \ 1025 D->getKind() <= Decl::last##NAME) \ 1026 return true; 1027 #include "clang/AST/DeclNodes.inc" 1028 return false; 1029 } 1030 } 1031 1032 DeclContext::~DeclContext() = default; 1033 1034 /// Find the parent context of this context that will be 1035 /// used for unqualified name lookup. 1036 /// 1037 /// Generally, the parent lookup context is the semantic context. However, for 1038 /// a friend function the parent lookup context is the lexical context, which 1039 /// is the class in which the friend is declared. 1040 DeclContext *DeclContext::getLookupParent() { 1041 // FIXME: Find a better way to identify friends. 1042 if (isa<FunctionDecl>(this)) 1043 if (getParent()->getRedeclContext()->isFileContext() && 1044 getLexicalParent()->getRedeclContext()->isRecord()) 1045 return getLexicalParent(); 1046 1047 // A lookup within the call operator of a lambda never looks in the lambda 1048 // class; instead, skip to the context in which that closure type is 1049 // declared. 1050 if (isLambdaCallOperator(this)) 1051 return getParent()->getParent(); 1052 1053 return getParent(); 1054 } 1055 1056 const BlockDecl *DeclContext::getInnermostBlockDecl() const { 1057 const DeclContext *Ctx = this; 1058 1059 do { 1060 if (Ctx->isClosure()) 1061 return cast<BlockDecl>(Ctx); 1062 Ctx = Ctx->getParent(); 1063 } while (Ctx); 1064 1065 return nullptr; 1066 } 1067 1068 bool DeclContext::isInlineNamespace() const { 1069 return isNamespace() && 1070 cast<NamespaceDecl>(this)->isInline(); 1071 } 1072 1073 bool DeclContext::isStdNamespace() const { 1074 if (!isNamespace()) 1075 return false; 1076 1077 const auto *ND = cast<NamespaceDecl>(this); 1078 if (ND->isInline()) { 1079 return ND->getParent()->isStdNamespace(); 1080 } 1081 1082 if (!getParent()->getRedeclContext()->isTranslationUnit()) 1083 return false; 1084 1085 const IdentifierInfo *II = ND->getIdentifier(); 1086 return II && II->isStr("std"); 1087 } 1088 1089 bool DeclContext::isDependentContext() const { 1090 if (isFileContext()) 1091 return false; 1092 1093 if (isa<ClassTemplatePartialSpecializationDecl>(this)) 1094 return true; 1095 1096 if (const auto *Record = dyn_cast<CXXRecordDecl>(this)) { 1097 if (Record->getDescribedClassTemplate()) 1098 return true; 1099 1100 if (Record->isDependentLambda()) 1101 return true; 1102 } 1103 1104 if (const auto *Function = dyn_cast<FunctionDecl>(this)) { 1105 if (Function->getDescribedFunctionTemplate()) 1106 return true; 1107 1108 // Friend function declarations are dependent if their *lexical* 1109 // context is dependent. 1110 if (cast<Decl>(this)->getFriendObjectKind()) 1111 return getLexicalParent()->isDependentContext(); 1112 } 1113 1114 // FIXME: A variable template is a dependent context, but is not a 1115 // DeclContext. A context within it (such as a lambda-expression) 1116 // should be considered dependent. 1117 1118 return getParent() && getParent()->isDependentContext(); 1119 } 1120 1121 bool DeclContext::isTransparentContext() const { 1122 if (getDeclKind() == Decl::Enum) 1123 return !cast<EnumDecl>(this)->isScoped(); 1124 else if (getDeclKind() == Decl::LinkageSpec || getDeclKind() == Decl::Export) 1125 return true; 1126 1127 return false; 1128 } 1129 1130 static bool isLinkageSpecContext(const DeclContext *DC, 1131 LinkageSpecDecl::LanguageIDs ID) { 1132 while (DC->getDeclKind() != Decl::TranslationUnit) { 1133 if (DC->getDeclKind() == Decl::LinkageSpec) 1134 return cast<LinkageSpecDecl>(DC)->getLanguage() == ID; 1135 DC = DC->getLexicalParent(); 1136 } 1137 return false; 1138 } 1139 1140 bool DeclContext::isExternCContext() const { 1141 return isLinkageSpecContext(this, LinkageSpecDecl::lang_c); 1142 } 1143 1144 const LinkageSpecDecl *DeclContext::getExternCContext() const { 1145 const DeclContext *DC = this; 1146 while (DC->getDeclKind() != Decl::TranslationUnit) { 1147 if (DC->getDeclKind() == Decl::LinkageSpec && 1148 cast<LinkageSpecDecl>(DC)->getLanguage() == LinkageSpecDecl::lang_c) 1149 return cast<LinkageSpecDecl>(DC); 1150 DC = DC->getLexicalParent(); 1151 } 1152 return nullptr; 1153 } 1154 1155 bool DeclContext::isExternCXXContext() const { 1156 return isLinkageSpecContext(this, LinkageSpecDecl::lang_cxx); 1157 } 1158 1159 bool DeclContext::Encloses(const DeclContext *DC) const { 1160 if (getPrimaryContext() != this) 1161 return getPrimaryContext()->Encloses(DC); 1162 1163 for (; DC; DC = DC->getParent()) 1164 if (DC->getPrimaryContext() == this) 1165 return true; 1166 return false; 1167 } 1168 1169 DeclContext *DeclContext::getPrimaryContext() { 1170 switch (getDeclKind()) { 1171 case Decl::TranslationUnit: 1172 case Decl::ExternCContext: 1173 case Decl::LinkageSpec: 1174 case Decl::Export: 1175 case Decl::Block: 1176 case Decl::Captured: 1177 case Decl::OMPDeclareReduction: 1178 case Decl::OMPDeclareMapper: 1179 // There is only one DeclContext for these entities. 1180 return this; 1181 1182 case Decl::Namespace: 1183 // The original namespace is our primary context. 1184 return static_cast<NamespaceDecl *>(this)->getOriginalNamespace(); 1185 1186 case Decl::ObjCMethod: 1187 return this; 1188 1189 case Decl::ObjCInterface: 1190 if (auto *OID = dyn_cast<ObjCInterfaceDecl>(this)) 1191 if (auto *Def = OID->getDefinition()) 1192 return Def; 1193 return this; 1194 1195 case Decl::ObjCProtocol: 1196 if (auto *OPD = dyn_cast<ObjCProtocolDecl>(this)) 1197 if (auto *Def = OPD->getDefinition()) 1198 return Def; 1199 return this; 1200 1201 case Decl::ObjCCategory: 1202 return this; 1203 1204 case Decl::ObjCImplementation: 1205 case Decl::ObjCCategoryImpl: 1206 return this; 1207 1208 default: 1209 if (getDeclKind() >= Decl::firstTag && getDeclKind() <= Decl::lastTag) { 1210 // If this is a tag type that has a definition or is currently 1211 // being defined, that definition is our primary context. 1212 auto *Tag = cast<TagDecl>(this); 1213 1214 if (TagDecl *Def = Tag->getDefinition()) 1215 return Def; 1216 1217 if (const auto *TagTy = dyn_cast<TagType>(Tag->getTypeForDecl())) { 1218 // Note, TagType::getDecl returns the (partial) definition one exists. 1219 TagDecl *PossiblePartialDef = TagTy->getDecl(); 1220 if (PossiblePartialDef->isBeingDefined()) 1221 return PossiblePartialDef; 1222 } else { 1223 assert(isa<InjectedClassNameType>(Tag->getTypeForDecl())); 1224 } 1225 1226 return Tag; 1227 } 1228 1229 assert(getDeclKind() >= Decl::firstFunction && 1230 getDeclKind() <= Decl::lastFunction && 1231 "Unknown DeclContext kind"); 1232 return this; 1233 } 1234 } 1235 1236 void 1237 DeclContext::collectAllContexts(SmallVectorImpl<DeclContext *> &Contexts){ 1238 Contexts.clear(); 1239 1240 if (getDeclKind() != Decl::Namespace) { 1241 Contexts.push_back(this); 1242 return; 1243 } 1244 1245 auto *Self = static_cast<NamespaceDecl *>(this); 1246 for (NamespaceDecl *N = Self->getMostRecentDecl(); N; 1247 N = N->getPreviousDecl()) 1248 Contexts.push_back(N); 1249 1250 std::reverse(Contexts.begin(), Contexts.end()); 1251 } 1252 1253 std::pair<Decl *, Decl *> 1254 DeclContext::BuildDeclChain(ArrayRef<Decl *> Decls, 1255 bool FieldsAlreadyLoaded) { 1256 // Build up a chain of declarations via the Decl::NextInContextAndBits field. 1257 Decl *FirstNewDecl = nullptr; 1258 Decl *PrevDecl = nullptr; 1259 for (auto *D : Decls) { 1260 if (FieldsAlreadyLoaded && isa<FieldDecl>(D)) 1261 continue; 1262 1263 if (PrevDecl) 1264 PrevDecl->NextInContextAndBits.setPointer(D); 1265 else 1266 FirstNewDecl = D; 1267 1268 PrevDecl = D; 1269 } 1270 1271 return std::make_pair(FirstNewDecl, PrevDecl); 1272 } 1273 1274 /// We have just acquired external visible storage, and we already have 1275 /// built a lookup map. For every name in the map, pull in the new names from 1276 /// the external storage. 1277 void DeclContext::reconcileExternalVisibleStorage() const { 1278 assert(hasNeedToReconcileExternalVisibleStorage() && LookupPtr); 1279 setNeedToReconcileExternalVisibleStorage(false); 1280 1281 for (auto &Lookup : *LookupPtr) 1282 Lookup.second.setHasExternalDecls(); 1283 } 1284 1285 /// Load the declarations within this lexical storage from an 1286 /// external source. 1287 /// \return \c true if any declarations were added. 1288 bool 1289 DeclContext::LoadLexicalDeclsFromExternalStorage() const { 1290 ExternalASTSource *Source = getParentASTContext().getExternalSource(); 1291 assert(hasExternalLexicalStorage() && Source && "No external storage?"); 1292 1293 // Notify that we have a DeclContext that is initializing. 1294 ExternalASTSource::Deserializing ADeclContext(Source); 1295 1296 // Load the external declarations, if any. 1297 SmallVector<Decl*, 64> Decls; 1298 setHasExternalLexicalStorage(false); 1299 Source->FindExternalLexicalDecls(this, Decls); 1300 1301 if (Decls.empty()) 1302 return false; 1303 1304 // We may have already loaded just the fields of this record, in which case 1305 // we need to ignore them. 1306 bool FieldsAlreadyLoaded = false; 1307 if (const auto *RD = dyn_cast<RecordDecl>(this)) 1308 FieldsAlreadyLoaded = RD->hasLoadedFieldsFromExternalStorage(); 1309 1310 // Splice the newly-read declarations into the beginning of the list 1311 // of declarations. 1312 Decl *ExternalFirst, *ExternalLast; 1313 std::tie(ExternalFirst, ExternalLast) = 1314 BuildDeclChain(Decls, FieldsAlreadyLoaded); 1315 ExternalLast->NextInContextAndBits.setPointer(FirstDecl); 1316 FirstDecl = ExternalFirst; 1317 if (!LastDecl) 1318 LastDecl = ExternalLast; 1319 return true; 1320 } 1321 1322 DeclContext::lookup_result 1323 ExternalASTSource::SetNoExternalVisibleDeclsForName(const DeclContext *DC, 1324 DeclarationName Name) { 1325 ASTContext &Context = DC->getParentASTContext(); 1326 StoredDeclsMap *Map; 1327 if (!(Map = DC->LookupPtr)) 1328 Map = DC->CreateStoredDeclsMap(Context); 1329 if (DC->hasNeedToReconcileExternalVisibleStorage()) 1330 DC->reconcileExternalVisibleStorage(); 1331 1332 (*Map)[Name].removeExternalDecls(); 1333 1334 return DeclContext::lookup_result(); 1335 } 1336 1337 DeclContext::lookup_result 1338 ExternalASTSource::SetExternalVisibleDeclsForName(const DeclContext *DC, 1339 DeclarationName Name, 1340 ArrayRef<NamedDecl*> Decls) { 1341 ASTContext &Context = DC->getParentASTContext(); 1342 StoredDeclsMap *Map; 1343 if (!(Map = DC->LookupPtr)) 1344 Map = DC->CreateStoredDeclsMap(Context); 1345 if (DC->hasNeedToReconcileExternalVisibleStorage()) 1346 DC->reconcileExternalVisibleStorage(); 1347 1348 StoredDeclsList &List = (*Map)[Name]; 1349 1350 // Clear out any old external visible declarations, to avoid quadratic 1351 // performance in the redeclaration checks below. 1352 List.removeExternalDecls(); 1353 1354 if (!List.isNull()) { 1355 // We have both existing declarations and new declarations for this name. 1356 // Some of the declarations may simply replace existing ones. Handle those 1357 // first. 1358 llvm::SmallVector<unsigned, 8> Skip; 1359 for (unsigned I = 0, N = Decls.size(); I != N; ++I) 1360 if (List.HandleRedeclaration(Decls[I], /*IsKnownNewer*/false)) 1361 Skip.push_back(I); 1362 Skip.push_back(Decls.size()); 1363 1364 // Add in any new declarations. 1365 unsigned SkipPos = 0; 1366 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 1367 if (I == Skip[SkipPos]) 1368 ++SkipPos; 1369 else 1370 List.AddSubsequentDecl(Decls[I]); 1371 } 1372 } else { 1373 // Convert the array to a StoredDeclsList. 1374 for (auto *D : Decls) { 1375 if (List.isNull()) 1376 List.setOnlyValue(D); 1377 else 1378 List.AddSubsequentDecl(D); 1379 } 1380 } 1381 1382 return List.getLookupResult(); 1383 } 1384 1385 DeclContext::decl_iterator DeclContext::decls_begin() const { 1386 if (hasExternalLexicalStorage()) 1387 LoadLexicalDeclsFromExternalStorage(); 1388 return decl_iterator(FirstDecl); 1389 } 1390 1391 bool DeclContext::decls_empty() const { 1392 if (hasExternalLexicalStorage()) 1393 LoadLexicalDeclsFromExternalStorage(); 1394 1395 return !FirstDecl; 1396 } 1397 1398 bool DeclContext::containsDecl(Decl *D) const { 1399 return (D->getLexicalDeclContext() == this && 1400 (D->NextInContextAndBits.getPointer() || D == LastDecl)); 1401 } 1402 1403 bool DeclContext::containsDeclAndLoad(Decl *D) const { 1404 if (hasExternalLexicalStorage()) 1405 LoadLexicalDeclsFromExternalStorage(); 1406 return containsDecl(D); 1407 } 1408 1409 /// shouldBeHidden - Determine whether a declaration which was declared 1410 /// within its semantic context should be invisible to qualified name lookup. 1411 static bool shouldBeHidden(NamedDecl *D) { 1412 // Skip unnamed declarations. 1413 if (!D->getDeclName()) 1414 return true; 1415 1416 // Skip entities that can't be found by name lookup into a particular 1417 // context. 1418 if ((D->getIdentifierNamespace() == 0 && !isa<UsingDirectiveDecl>(D)) || 1419 D->isTemplateParameter()) 1420 return true; 1421 1422 // Skip friends and local extern declarations unless they're the first 1423 // declaration of the entity. 1424 if ((D->isLocalExternDecl() || D->getFriendObjectKind()) && 1425 D != D->getCanonicalDecl()) 1426 return true; 1427 1428 // Skip template specializations. 1429 // FIXME: This feels like a hack. Should DeclarationName support 1430 // template-ids, or is there a better way to keep specializations 1431 // from being visible? 1432 if (isa<ClassTemplateSpecializationDecl>(D)) 1433 return true; 1434 if (auto *FD = dyn_cast<FunctionDecl>(D)) 1435 if (FD->isFunctionTemplateSpecialization()) 1436 return true; 1437 1438 return false; 1439 } 1440 1441 void DeclContext::removeDecl(Decl *D) { 1442 assert(D->getLexicalDeclContext() == this && 1443 "decl being removed from non-lexical context"); 1444 assert((D->NextInContextAndBits.getPointer() || D == LastDecl) && 1445 "decl is not in decls list"); 1446 1447 // Remove D from the decl chain. This is O(n) but hopefully rare. 1448 if (D == FirstDecl) { 1449 if (D == LastDecl) 1450 FirstDecl = LastDecl = nullptr; 1451 else 1452 FirstDecl = D->NextInContextAndBits.getPointer(); 1453 } else { 1454 for (Decl *I = FirstDecl; true; I = I->NextInContextAndBits.getPointer()) { 1455 assert(I && "decl not found in linked list"); 1456 if (I->NextInContextAndBits.getPointer() == D) { 1457 I->NextInContextAndBits.setPointer(D->NextInContextAndBits.getPointer()); 1458 if (D == LastDecl) LastDecl = I; 1459 break; 1460 } 1461 } 1462 } 1463 1464 // Mark that D is no longer in the decl chain. 1465 D->NextInContextAndBits.setPointer(nullptr); 1466 1467 // Remove D from the lookup table if necessary. 1468 if (isa<NamedDecl>(D)) { 1469 auto *ND = cast<NamedDecl>(D); 1470 1471 // Do not try to remove the declaration if that is invisible to qualified 1472 // lookup. E.g. template specializations are skipped. 1473 if (shouldBeHidden(ND)) 1474 return; 1475 1476 // Remove only decls that have a name 1477 if (!ND->getDeclName()) 1478 return; 1479 1480 auto *DC = D->getDeclContext(); 1481 do { 1482 StoredDeclsMap *Map = DC->getPrimaryContext()->LookupPtr; 1483 if (Map) { 1484 StoredDeclsMap::iterator Pos = Map->find(ND->getDeclName()); 1485 assert(Pos != Map->end() && "no lookup entry for decl"); 1486 // Remove the decl only if it is contained. 1487 StoredDeclsList::DeclsTy *Vec = Pos->second.getAsVector(); 1488 if ((Vec && is_contained(*Vec, ND)) || Pos->second.getAsDecl() == ND) 1489 Pos->second.remove(ND); 1490 } 1491 } while (DC->isTransparentContext() && (DC = DC->getParent())); 1492 } 1493 } 1494 1495 void DeclContext::addHiddenDecl(Decl *D) { 1496 assert(D->getLexicalDeclContext() == this && 1497 "Decl inserted into wrong lexical context"); 1498 assert(!D->getNextDeclInContext() && D != LastDecl && 1499 "Decl already inserted into a DeclContext"); 1500 1501 if (FirstDecl) { 1502 LastDecl->NextInContextAndBits.setPointer(D); 1503 LastDecl = D; 1504 } else { 1505 FirstDecl = LastDecl = D; 1506 } 1507 1508 // Notify a C++ record declaration that we've added a member, so it can 1509 // update its class-specific state. 1510 if (auto *Record = dyn_cast<CXXRecordDecl>(this)) 1511 Record->addedMember(D); 1512 1513 // If this is a newly-created (not de-serialized) import declaration, wire 1514 // it in to the list of local import declarations. 1515 if (!D->isFromASTFile()) { 1516 if (auto *Import = dyn_cast<ImportDecl>(D)) 1517 D->getASTContext().addedLocalImportDecl(Import); 1518 } 1519 } 1520 1521 void DeclContext::addDecl(Decl *D) { 1522 addHiddenDecl(D); 1523 1524 if (auto *ND = dyn_cast<NamedDecl>(D)) 1525 ND->getDeclContext()->getPrimaryContext()-> 1526 makeDeclVisibleInContextWithFlags(ND, false, true); 1527 } 1528 1529 void DeclContext::addDeclInternal(Decl *D) { 1530 addHiddenDecl(D); 1531 1532 if (auto *ND = dyn_cast<NamedDecl>(D)) 1533 ND->getDeclContext()->getPrimaryContext()-> 1534 makeDeclVisibleInContextWithFlags(ND, true, true); 1535 } 1536 1537 /// buildLookup - Build the lookup data structure with all of the 1538 /// declarations in this DeclContext (and any other contexts linked 1539 /// to it or transparent contexts nested within it) and return it. 1540 /// 1541 /// Note that the produced map may miss out declarations from an 1542 /// external source. If it does, those entries will be marked with 1543 /// the 'hasExternalDecls' flag. 1544 StoredDeclsMap *DeclContext::buildLookup() { 1545 assert(this == getPrimaryContext() && "buildLookup called on non-primary DC"); 1546 1547 if (!hasLazyLocalLexicalLookups() && 1548 !hasLazyExternalLexicalLookups()) 1549 return LookupPtr; 1550 1551 SmallVector<DeclContext *, 2> Contexts; 1552 collectAllContexts(Contexts); 1553 1554 if (hasLazyExternalLexicalLookups()) { 1555 setHasLazyExternalLexicalLookups(false); 1556 for (auto *DC : Contexts) { 1557 if (DC->hasExternalLexicalStorage()) { 1558 bool LoadedDecls = DC->LoadLexicalDeclsFromExternalStorage(); 1559 setHasLazyLocalLexicalLookups( 1560 hasLazyLocalLexicalLookups() | LoadedDecls ); 1561 } 1562 } 1563 1564 if (!hasLazyLocalLexicalLookups()) 1565 return LookupPtr; 1566 } 1567 1568 for (auto *DC : Contexts) 1569 buildLookupImpl(DC, hasExternalVisibleStorage()); 1570 1571 // We no longer have any lazy decls. 1572 setHasLazyLocalLexicalLookups(false); 1573 return LookupPtr; 1574 } 1575 1576 /// buildLookupImpl - Build part of the lookup data structure for the 1577 /// declarations contained within DCtx, which will either be this 1578 /// DeclContext, a DeclContext linked to it, or a transparent context 1579 /// nested within it. 1580 void DeclContext::buildLookupImpl(DeclContext *DCtx, bool Internal) { 1581 for (auto *D : DCtx->noload_decls()) { 1582 // Insert this declaration into the lookup structure, but only if 1583 // it's semantically within its decl context. Any other decls which 1584 // should be found in this context are added eagerly. 1585 // 1586 // If it's from an AST file, don't add it now. It'll get handled by 1587 // FindExternalVisibleDeclsByName if needed. Exception: if we're not 1588 // in C++, we do not track external visible decls for the TU, so in 1589 // that case we need to collect them all here. 1590 if (auto *ND = dyn_cast<NamedDecl>(D)) 1591 if (ND->getDeclContext() == DCtx && !shouldBeHidden(ND) && 1592 (!ND->isFromASTFile() || 1593 (isTranslationUnit() && 1594 !getParentASTContext().getLangOpts().CPlusPlus))) 1595 makeDeclVisibleInContextImpl(ND, Internal); 1596 1597 // If this declaration is itself a transparent declaration context 1598 // or inline namespace, add the members of this declaration of that 1599 // context (recursively). 1600 if (auto *InnerCtx = dyn_cast<DeclContext>(D)) 1601 if (InnerCtx->isTransparentContext() || InnerCtx->isInlineNamespace()) 1602 buildLookupImpl(InnerCtx, Internal); 1603 } 1604 } 1605 1606 NamedDecl *const DeclContextLookupResult::SingleElementDummyList = nullptr; 1607 1608 DeclContext::lookup_result 1609 DeclContext::lookup(DeclarationName Name) const { 1610 assert(getDeclKind() != Decl::LinkageSpec && 1611 getDeclKind() != Decl::Export && 1612 "should not perform lookups into transparent contexts"); 1613 1614 const DeclContext *PrimaryContext = getPrimaryContext(); 1615 if (PrimaryContext != this) 1616 return PrimaryContext->lookup(Name); 1617 1618 // If we have an external source, ensure that any later redeclarations of this 1619 // context have been loaded, since they may add names to the result of this 1620 // lookup (or add external visible storage). 1621 ExternalASTSource *Source = getParentASTContext().getExternalSource(); 1622 if (Source) 1623 (void)cast<Decl>(this)->getMostRecentDecl(); 1624 1625 if (hasExternalVisibleStorage()) { 1626 assert(Source && "external visible storage but no external source?"); 1627 1628 if (hasNeedToReconcileExternalVisibleStorage()) 1629 reconcileExternalVisibleStorage(); 1630 1631 StoredDeclsMap *Map = LookupPtr; 1632 1633 if (hasLazyLocalLexicalLookups() || 1634 hasLazyExternalLexicalLookups()) 1635 // FIXME: Make buildLookup const? 1636 Map = const_cast<DeclContext*>(this)->buildLookup(); 1637 1638 if (!Map) 1639 Map = CreateStoredDeclsMap(getParentASTContext()); 1640 1641 // If we have a lookup result with no external decls, we are done. 1642 std::pair<StoredDeclsMap::iterator, bool> R = 1643 Map->insert(std::make_pair(Name, StoredDeclsList())); 1644 if (!R.second && !R.first->second.hasExternalDecls()) 1645 return R.first->second.getLookupResult(); 1646 1647 if (Source->FindExternalVisibleDeclsByName(this, Name) || !R.second) { 1648 if (StoredDeclsMap *Map = LookupPtr) { 1649 StoredDeclsMap::iterator I = Map->find(Name); 1650 if (I != Map->end()) 1651 return I->second.getLookupResult(); 1652 } 1653 } 1654 1655 return {}; 1656 } 1657 1658 StoredDeclsMap *Map = LookupPtr; 1659 if (hasLazyLocalLexicalLookups() || 1660 hasLazyExternalLexicalLookups()) 1661 Map = const_cast<DeclContext*>(this)->buildLookup(); 1662 1663 if (!Map) 1664 return {}; 1665 1666 StoredDeclsMap::iterator I = Map->find(Name); 1667 if (I == Map->end()) 1668 return {}; 1669 1670 return I->second.getLookupResult(); 1671 } 1672 1673 DeclContext::lookup_result 1674 DeclContext::noload_lookup(DeclarationName Name) { 1675 assert(getDeclKind() != Decl::LinkageSpec && 1676 getDeclKind() != Decl::Export && 1677 "should not perform lookups into transparent contexts"); 1678 1679 DeclContext *PrimaryContext = getPrimaryContext(); 1680 if (PrimaryContext != this) 1681 return PrimaryContext->noload_lookup(Name); 1682 1683 loadLazyLocalLexicalLookups(); 1684 StoredDeclsMap *Map = LookupPtr; 1685 if (!Map) 1686 return {}; 1687 1688 StoredDeclsMap::iterator I = Map->find(Name); 1689 return I != Map->end() ? I->second.getLookupResult() 1690 : lookup_result(); 1691 } 1692 1693 // If we have any lazy lexical declarations not in our lookup map, add them 1694 // now. Don't import any external declarations, not even if we know we have 1695 // some missing from the external visible lookups. 1696 void DeclContext::loadLazyLocalLexicalLookups() { 1697 if (hasLazyLocalLexicalLookups()) { 1698 SmallVector<DeclContext *, 2> Contexts; 1699 collectAllContexts(Contexts); 1700 for (auto *Context : Contexts) 1701 buildLookupImpl(Context, hasExternalVisibleStorage()); 1702 setHasLazyLocalLexicalLookups(false); 1703 } 1704 } 1705 1706 void DeclContext::localUncachedLookup(DeclarationName Name, 1707 SmallVectorImpl<NamedDecl *> &Results) { 1708 Results.clear(); 1709 1710 // If there's no external storage, just perform a normal lookup and copy 1711 // the results. 1712 if (!hasExternalVisibleStorage() && !hasExternalLexicalStorage() && Name) { 1713 lookup_result LookupResults = lookup(Name); 1714 Results.insert(Results.end(), LookupResults.begin(), LookupResults.end()); 1715 return; 1716 } 1717 1718 // If we have a lookup table, check there first. Maybe we'll get lucky. 1719 // FIXME: Should we be checking these flags on the primary context? 1720 if (Name && !hasLazyLocalLexicalLookups() && 1721 !hasLazyExternalLexicalLookups()) { 1722 if (StoredDeclsMap *Map = LookupPtr) { 1723 StoredDeclsMap::iterator Pos = Map->find(Name); 1724 if (Pos != Map->end()) { 1725 Results.insert(Results.end(), 1726 Pos->second.getLookupResult().begin(), 1727 Pos->second.getLookupResult().end()); 1728 return; 1729 } 1730 } 1731 } 1732 1733 // Slow case: grovel through the declarations in our chain looking for 1734 // matches. 1735 // FIXME: If we have lazy external declarations, this will not find them! 1736 // FIXME: Should we CollectAllContexts and walk them all here? 1737 for (Decl *D = FirstDecl; D; D = D->getNextDeclInContext()) { 1738 if (auto *ND = dyn_cast<NamedDecl>(D)) 1739 if (ND->getDeclName() == Name) 1740 Results.push_back(ND); 1741 } 1742 } 1743 1744 DeclContext *DeclContext::getRedeclContext() { 1745 DeclContext *Ctx = this; 1746 1747 // In C, a record type is the redeclaration context for its fields only. If 1748 // we arrive at a record context after skipping anything else, we should skip 1749 // the record as well. Currently, this means skipping enumerations because 1750 // they're the only transparent context that can exist within a struct or 1751 // union. 1752 bool SkipRecords = getDeclKind() == Decl::Kind::Enum && 1753 !getParentASTContext().getLangOpts().CPlusPlus; 1754 1755 // Skip through contexts to get to the redeclaration context. Transparent 1756 // contexts are always skipped. 1757 while ((SkipRecords && Ctx->isRecord()) || Ctx->isTransparentContext()) 1758 Ctx = Ctx->getParent(); 1759 return Ctx; 1760 } 1761 1762 DeclContext *DeclContext::getEnclosingNamespaceContext() { 1763 DeclContext *Ctx = this; 1764 // Skip through non-namespace, non-translation-unit contexts. 1765 while (!Ctx->isFileContext()) 1766 Ctx = Ctx->getParent(); 1767 return Ctx->getPrimaryContext(); 1768 } 1769 1770 RecordDecl *DeclContext::getOuterLexicalRecordContext() { 1771 // Loop until we find a non-record context. 1772 RecordDecl *OutermostRD = nullptr; 1773 DeclContext *DC = this; 1774 while (DC->isRecord()) { 1775 OutermostRD = cast<RecordDecl>(DC); 1776 DC = DC->getLexicalParent(); 1777 } 1778 return OutermostRD; 1779 } 1780 1781 bool DeclContext::InEnclosingNamespaceSetOf(const DeclContext *O) const { 1782 // For non-file contexts, this is equivalent to Equals. 1783 if (!isFileContext()) 1784 return O->Equals(this); 1785 1786 do { 1787 if (O->Equals(this)) 1788 return true; 1789 1790 const auto *NS = dyn_cast<NamespaceDecl>(O); 1791 if (!NS || !NS->isInline()) 1792 break; 1793 O = NS->getParent(); 1794 } while (O); 1795 1796 return false; 1797 } 1798 1799 void DeclContext::makeDeclVisibleInContext(NamedDecl *D) { 1800 DeclContext *PrimaryDC = this->getPrimaryContext(); 1801 DeclContext *DeclDC = D->getDeclContext()->getPrimaryContext(); 1802 // If the decl is being added outside of its semantic decl context, we 1803 // need to ensure that we eagerly build the lookup information for it. 1804 PrimaryDC->makeDeclVisibleInContextWithFlags(D, false, PrimaryDC == DeclDC); 1805 } 1806 1807 void DeclContext::makeDeclVisibleInContextWithFlags(NamedDecl *D, bool Internal, 1808 bool Recoverable) { 1809 assert(this == getPrimaryContext() && "expected a primary DC"); 1810 1811 if (!isLookupContext()) { 1812 if (isTransparentContext()) 1813 getParent()->getPrimaryContext() 1814 ->makeDeclVisibleInContextWithFlags(D, Internal, Recoverable); 1815 return; 1816 } 1817 1818 // Skip declarations which should be invisible to name lookup. 1819 if (shouldBeHidden(D)) 1820 return; 1821 1822 // If we already have a lookup data structure, perform the insertion into 1823 // it. If we might have externally-stored decls with this name, look them 1824 // up and perform the insertion. If this decl was declared outside its 1825 // semantic context, buildLookup won't add it, so add it now. 1826 // 1827 // FIXME: As a performance hack, don't add such decls into the translation 1828 // unit unless we're in C++, since qualified lookup into the TU is never 1829 // performed. 1830 if (LookupPtr || hasExternalVisibleStorage() || 1831 ((!Recoverable || D->getDeclContext() != D->getLexicalDeclContext()) && 1832 (getParentASTContext().getLangOpts().CPlusPlus || 1833 !isTranslationUnit()))) { 1834 // If we have lazily omitted any decls, they might have the same name as 1835 // the decl which we are adding, so build a full lookup table before adding 1836 // this decl. 1837 buildLookup(); 1838 makeDeclVisibleInContextImpl(D, Internal); 1839 } else { 1840 setHasLazyLocalLexicalLookups(true); 1841 } 1842 1843 // If we are a transparent context or inline namespace, insert into our 1844 // parent context, too. This operation is recursive. 1845 if (isTransparentContext() || isInlineNamespace()) 1846 getParent()->getPrimaryContext()-> 1847 makeDeclVisibleInContextWithFlags(D, Internal, Recoverable); 1848 1849 auto *DCAsDecl = cast<Decl>(this); 1850 // Notify that a decl was made visible unless we are a Tag being defined. 1851 if (!(isa<TagDecl>(DCAsDecl) && cast<TagDecl>(DCAsDecl)->isBeingDefined())) 1852 if (ASTMutationListener *L = DCAsDecl->getASTMutationListener()) 1853 L->AddedVisibleDecl(this, D); 1854 } 1855 1856 void DeclContext::makeDeclVisibleInContextImpl(NamedDecl *D, bool Internal) { 1857 // Find or create the stored declaration map. 1858 StoredDeclsMap *Map = LookupPtr; 1859 if (!Map) { 1860 ASTContext *C = &getParentASTContext(); 1861 Map = CreateStoredDeclsMap(*C); 1862 } 1863 1864 // If there is an external AST source, load any declarations it knows about 1865 // with this declaration's name. 1866 // If the lookup table contains an entry about this name it means that we 1867 // have already checked the external source. 1868 if (!Internal) 1869 if (ExternalASTSource *Source = getParentASTContext().getExternalSource()) 1870 if (hasExternalVisibleStorage() && 1871 Map->find(D->getDeclName()) == Map->end()) 1872 Source->FindExternalVisibleDeclsByName(this, D->getDeclName()); 1873 1874 // Insert this declaration into the map. 1875 StoredDeclsList &DeclNameEntries = (*Map)[D->getDeclName()]; 1876 1877 if (Internal) { 1878 // If this is being added as part of loading an external declaration, 1879 // this may not be the only external declaration with this name. 1880 // In this case, we never try to replace an existing declaration; we'll 1881 // handle that when we finalize the list of declarations for this name. 1882 DeclNameEntries.setHasExternalDecls(); 1883 DeclNameEntries.AddSubsequentDecl(D); 1884 return; 1885 } 1886 1887 if (DeclNameEntries.isNull()) { 1888 DeclNameEntries.setOnlyValue(D); 1889 return; 1890 } 1891 1892 if (DeclNameEntries.HandleRedeclaration(D, /*IsKnownNewer*/!Internal)) { 1893 // This declaration has replaced an existing one for which 1894 // declarationReplaces returns true. 1895 return; 1896 } 1897 1898 // Put this declaration into the appropriate slot. 1899 DeclNameEntries.AddSubsequentDecl(D); 1900 } 1901 1902 UsingDirectiveDecl *DeclContext::udir_iterator::operator*() const { 1903 return cast<UsingDirectiveDecl>(*I); 1904 } 1905 1906 /// Returns iterator range [First, Last) of UsingDirectiveDecls stored within 1907 /// this context. 1908 DeclContext::udir_range DeclContext::using_directives() const { 1909 // FIXME: Use something more efficient than normal lookup for using 1910 // directives. In C++, using directives are looked up more than anything else. 1911 lookup_result Result = lookup(UsingDirectiveDecl::getName()); 1912 return udir_range(Result.begin(), Result.end()); 1913 } 1914 1915 //===----------------------------------------------------------------------===// 1916 // Creation and Destruction of StoredDeclsMaps. // 1917 //===----------------------------------------------------------------------===// 1918 1919 StoredDeclsMap *DeclContext::CreateStoredDeclsMap(ASTContext &C) const { 1920 assert(!LookupPtr && "context already has a decls map"); 1921 assert(getPrimaryContext() == this && 1922 "creating decls map on non-primary context"); 1923 1924 StoredDeclsMap *M; 1925 bool Dependent = isDependentContext(); 1926 if (Dependent) 1927 M = new DependentStoredDeclsMap(); 1928 else 1929 M = new StoredDeclsMap(); 1930 M->Previous = C.LastSDM; 1931 C.LastSDM = llvm::PointerIntPair<StoredDeclsMap*,1>(M, Dependent); 1932 LookupPtr = M; 1933 return M; 1934 } 1935 1936 void ASTContext::ReleaseDeclContextMaps() { 1937 // It's okay to delete DependentStoredDeclsMaps via a StoredDeclsMap 1938 // pointer because the subclass doesn't add anything that needs to 1939 // be deleted. 1940 StoredDeclsMap::DestroyAll(LastSDM.getPointer(), LastSDM.getInt()); 1941 } 1942 1943 void StoredDeclsMap::DestroyAll(StoredDeclsMap *Map, bool Dependent) { 1944 while (Map) { 1945 // Advance the iteration before we invalidate memory. 1946 llvm::PointerIntPair<StoredDeclsMap*,1> Next = Map->Previous; 1947 1948 if (Dependent) 1949 delete static_cast<DependentStoredDeclsMap*>(Map); 1950 else 1951 delete Map; 1952 1953 Map = Next.getPointer(); 1954 Dependent = Next.getInt(); 1955 } 1956 } 1957 1958 DependentDiagnostic *DependentDiagnostic::Create(ASTContext &C, 1959 DeclContext *Parent, 1960 const PartialDiagnostic &PDiag) { 1961 assert(Parent->isDependentContext() 1962 && "cannot iterate dependent diagnostics of non-dependent context"); 1963 Parent = Parent->getPrimaryContext(); 1964 if (!Parent->LookupPtr) 1965 Parent->CreateStoredDeclsMap(C); 1966 1967 auto *Map = static_cast<DependentStoredDeclsMap *>(Parent->LookupPtr); 1968 1969 // Allocate the copy of the PartialDiagnostic via the ASTContext's 1970 // BumpPtrAllocator, rather than the ASTContext itself. 1971 PartialDiagnostic::Storage *DiagStorage = nullptr; 1972 if (PDiag.hasStorage()) 1973 DiagStorage = new (C) PartialDiagnostic::Storage; 1974 1975 auto *DD = new (C) DependentDiagnostic(PDiag, DiagStorage); 1976 1977 // TODO: Maybe we shouldn't reverse the order during insertion. 1978 DD->NextDiagnostic = Map->FirstDiagnostic; 1979 Map->FirstDiagnostic = DD; 1980 1981 return DD; 1982 } 1983