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::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 } 349 350 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 } 359 360 bool Decl::isInStdNamespace() const { 361 const DeclContext *DC = getDeclContext(); 362 return DC && DC->isStdNamespace(); 363 } 364 365 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 } 379 380 ASTContext &Decl::getASTContext() const { 381 return getTranslationUnitDecl()->getASTContext(); 382 } 383 384 ASTMutationListener *Decl::getASTMutationListener() const { 385 return getASTContext().getASTMutationListener(); 386 } 387 388 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 } 400 401 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 } 415 416 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 } 425 426 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 } 437 438 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 } 458 459 bool Decl::hasDefiningAttr() const { 460 return hasAttr<AliasAttr>() || hasAttr<IFuncAttr>(); 461 } 462 463 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 } 470 471 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. 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 } 576 577 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 } 628 629 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 } 642 643 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 } 672 673 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 } 691 692 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 } 817 818 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 } 827 828 void Decl::dropAttrs() { 829 if (!HasAttrs) return; 830 831 HasAttrs = false; 832 getASTContext().eraseDeclAttrs(this); 833 } 834 835 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 } 857 858 const AttrVec &Decl::getAttrs() const { 859 assert(HasAttrs && "No attrs to get!"); 860 return getASTContext().getDeclAttrs(this); 861 } 862 863 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 } 881 882 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 } 900 901 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 } 916 917 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 } 949 950 static Decl::Kind getKind(const Decl *D) { return D->getKind(); } 951 static Decl::Kind getKind(const DeclContext *DC) { return DC->getDeclKind(); } 952 953 int64_t Decl::getID() const { 954 return getASTContext().getAllocator().identifyKnownAlignedObject<Decl>(this); 955 } 956 957 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.). 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 } 996 997 Decl *Decl::getNonClosureContext() { 998 return ::getNonClosureContext(this); 999 } 1000 1001 Decl *DeclContext::getNonClosureAncestor() { 1002 return ::getNonClosureContext(this); 1003 } 1004 1005 //===----------------------------------------------------------------------===// 1006 // DeclContext Implementation 1007 //===----------------------------------------------------------------------===// 1008 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 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. 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 1061 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 1073 bool DeclContext::isInlineNamespace() const { 1074 return isNamespace() && 1075 cast<NamespaceDecl>(this)->isInline(); 1076 } 1077 1078 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 1094 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 1126 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 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 1145 bool DeclContext::isExternCContext() const { 1146 return isLinkageSpecContext(this, LinkageSpecDecl::lang_c); 1147 } 1148 1149 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 1160 bool DeclContext::isExternCXXContext() const { 1161 return isLinkageSpecContext(this, LinkageSpecDecl::lang_cxx); 1162 } 1163 1164 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 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 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 *> 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. 1283 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 1295 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 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 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 1391 DeclContext::decl_iterator DeclContext::decls_begin() const { 1392 if (hasExternalLexicalStorage()) 1393 LoadLexicalDeclsFromExternalStorage(); 1394 return decl_iterator(FirstDecl); 1395 } 1396 1397 bool DeclContext::decls_empty() const { 1398 if (hasExternalLexicalStorage()) 1399 LoadLexicalDeclsFromExternalStorage(); 1400 1401 return !FirstDecl; 1402 } 1403 1404 bool DeclContext::containsDecl(Decl *D) const { 1405 return (D->getLexicalDeclContext() == this && 1406 (D->NextInContextAndBits.getPointer() || D == LastDecl)); 1407 } 1408 1409 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. 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 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 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 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 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. 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. 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 1615 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 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. 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 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 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 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 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 1787 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 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 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 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 1908 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. 1914 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 1925 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 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 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 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