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 case LifetimeExtendedTemporary: 807 case RequiresExprBody: 808 // Never looked up by name. 809 return 0; 810 } 811 812 llvm_unreachable("Invalid DeclKind!"); 813 } 814 815 void Decl::setAttrsImpl(const AttrVec &attrs, ASTContext &Ctx) { 816 assert(!HasAttrs && "Decl already contains attrs."); 817 818 AttrVec &AttrBlank = Ctx.getDeclAttrs(this); 819 assert(AttrBlank.empty() && "HasAttrs was wrong?"); 820 821 AttrBlank = attrs; 822 HasAttrs = true; 823 } 824 825 void Decl::dropAttrs() { 826 if (!HasAttrs) return; 827 828 HasAttrs = false; 829 getASTContext().eraseDeclAttrs(this); 830 } 831 832 void Decl::addAttr(Attr *A) { 833 if (!hasAttrs()) { 834 setAttrs(AttrVec(1, A)); 835 return; 836 } 837 838 AttrVec &Attrs = getAttrs(); 839 if (!A->isInherited()) { 840 Attrs.push_back(A); 841 return; 842 } 843 844 // Attribute inheritance is processed after attribute parsing. To keep the 845 // order as in the source code, add inherited attributes before non-inherited 846 // ones. 847 auto I = Attrs.begin(), E = Attrs.end(); 848 for (; I != E; ++I) { 849 if (!(*I)->isInherited()) 850 break; 851 } 852 Attrs.insert(I, A); 853 } 854 855 const AttrVec &Decl::getAttrs() const { 856 assert(HasAttrs && "No attrs to get!"); 857 return getASTContext().getDeclAttrs(this); 858 } 859 860 Decl *Decl::castFromDeclContext (const DeclContext *D) { 861 Decl::Kind DK = D->getDeclKind(); 862 switch(DK) { 863 #define DECL(NAME, BASE) 864 #define DECL_CONTEXT(NAME) \ 865 case Decl::NAME: \ 866 return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D)); 867 #define DECL_CONTEXT_BASE(NAME) 868 #include "clang/AST/DeclNodes.inc" 869 default: 870 #define DECL(NAME, BASE) 871 #define DECL_CONTEXT_BASE(NAME) \ 872 if (DK >= first##NAME && DK <= last##NAME) \ 873 return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D)); 874 #include "clang/AST/DeclNodes.inc" 875 llvm_unreachable("a decl that inherits DeclContext isn't handled"); 876 } 877 } 878 879 DeclContext *Decl::castToDeclContext(const Decl *D) { 880 Decl::Kind DK = D->getKind(); 881 switch(DK) { 882 #define DECL(NAME, BASE) 883 #define DECL_CONTEXT(NAME) \ 884 case Decl::NAME: \ 885 return static_cast<NAME##Decl *>(const_cast<Decl *>(D)); 886 #define DECL_CONTEXT_BASE(NAME) 887 #include "clang/AST/DeclNodes.inc" 888 default: 889 #define DECL(NAME, BASE) 890 #define DECL_CONTEXT_BASE(NAME) \ 891 if (DK >= first##NAME && DK <= last##NAME) \ 892 return static_cast<NAME##Decl *>(const_cast<Decl *>(D)); 893 #include "clang/AST/DeclNodes.inc" 894 llvm_unreachable("a decl that inherits DeclContext isn't handled"); 895 } 896 } 897 898 SourceLocation Decl::getBodyRBrace() const { 899 // Special handling of FunctionDecl to avoid de-serializing the body from PCH. 900 // FunctionDecl stores EndRangeLoc for this purpose. 901 if (const auto *FD = dyn_cast<FunctionDecl>(this)) { 902 const FunctionDecl *Definition; 903 if (FD->hasBody(Definition)) 904 return Definition->getSourceRange().getEnd(); 905 return {}; 906 } 907 908 if (Stmt *Body = getBody()) 909 return Body->getSourceRange().getEnd(); 910 911 return {}; 912 } 913 914 bool Decl::AccessDeclContextSanity() const { 915 #ifndef NDEBUG 916 // Suppress this check if any of the following hold: 917 // 1. this is the translation unit (and thus has no parent) 918 // 2. this is a template parameter (and thus doesn't belong to its context) 919 // 3. this is a non-type template parameter 920 // 4. the context is not a record 921 // 5. it's invalid 922 // 6. it's a C++0x static_assert. 923 // 7. it's a block literal declaration 924 if (isa<TranslationUnitDecl>(this) || 925 isa<TemplateTypeParmDecl>(this) || 926 isa<NonTypeTemplateParmDecl>(this) || 927 !getDeclContext() || 928 !isa<CXXRecordDecl>(getDeclContext()) || 929 isInvalidDecl() || 930 isa<StaticAssertDecl>(this) || 931 isa<BlockDecl>(this) || 932 // FIXME: a ParmVarDecl can have ClassTemplateSpecialization 933 // as DeclContext (?). 934 isa<ParmVarDecl>(this) || 935 // FIXME: a ClassTemplateSpecialization or CXXRecordDecl can have 936 // AS_none as access specifier. 937 isa<CXXRecordDecl>(this) || 938 isa<ClassScopeFunctionSpecializationDecl>(this)) 939 return true; 940 941 assert(Access != AS_none && 942 "Access specifier is AS_none inside a record decl"); 943 #endif 944 return true; 945 } 946 947 static Decl::Kind getKind(const Decl *D) { return D->getKind(); } 948 static Decl::Kind getKind(const DeclContext *DC) { return DC->getDeclKind(); } 949 950 int64_t Decl::getID() const { 951 return getASTContext().getAllocator().identifyKnownAlignedObject<Decl>(this); 952 } 953 954 const FunctionType *Decl::getFunctionType(bool BlocksToo) const { 955 QualType Ty; 956 if (const auto *D = dyn_cast<ValueDecl>(this)) 957 Ty = D->getType(); 958 else if (const auto *D = dyn_cast<TypedefNameDecl>(this)) 959 Ty = D->getUnderlyingType(); 960 else 961 return nullptr; 962 963 if (Ty->isFunctionPointerType()) 964 Ty = Ty->castAs<PointerType>()->getPointeeType(); 965 else if (Ty->isFunctionReferenceType()) 966 Ty = Ty->castAs<ReferenceType>()->getPointeeType(); 967 else if (BlocksToo && Ty->isBlockPointerType()) 968 Ty = Ty->castAs<BlockPointerType>()->getPointeeType(); 969 970 return Ty->getAs<FunctionType>(); 971 } 972 973 /// Starting at a given context (a Decl or DeclContext), look for a 974 /// code context that is not a closure (a lambda, block, etc.). 975 template <class T> static Decl *getNonClosureContext(T *D) { 976 if (getKind(D) == Decl::CXXMethod) { 977 auto *MD = cast<CXXMethodDecl>(D); 978 if (MD->getOverloadedOperator() == OO_Call && 979 MD->getParent()->isLambda()) 980 return getNonClosureContext(MD->getParent()->getParent()); 981 return MD; 982 } else if (auto *FD = dyn_cast<FunctionDecl>(D)) 983 return FD; 984 else if (auto *MD = dyn_cast<ObjCMethodDecl>(D)) 985 return MD; 986 else if (auto *BD = dyn_cast<BlockDecl>(D)) 987 return getNonClosureContext(BD->getParent()); 988 else if (auto *CD = dyn_cast<CapturedDecl>(D)) 989 return getNonClosureContext(CD->getParent()); 990 else 991 return nullptr; 992 } 993 994 Decl *Decl::getNonClosureContext() { 995 return ::getNonClosureContext(this); 996 } 997 998 Decl *DeclContext::getNonClosureAncestor() { 999 return ::getNonClosureContext(this); 1000 } 1001 1002 //===----------------------------------------------------------------------===// 1003 // DeclContext Implementation 1004 //===----------------------------------------------------------------------===// 1005 1006 DeclContext::DeclContext(Decl::Kind K) { 1007 DeclContextBits.DeclKind = K; 1008 setHasExternalLexicalStorage(false); 1009 setHasExternalVisibleStorage(false); 1010 setNeedToReconcileExternalVisibleStorage(false); 1011 setHasLazyLocalLexicalLookups(false); 1012 setHasLazyExternalLexicalLookups(false); 1013 setUseQualifiedLookup(false); 1014 } 1015 1016 bool DeclContext::classof(const Decl *D) { 1017 switch (D->getKind()) { 1018 #define DECL(NAME, BASE) 1019 #define DECL_CONTEXT(NAME) case Decl::NAME: 1020 #define DECL_CONTEXT_BASE(NAME) 1021 #include "clang/AST/DeclNodes.inc" 1022 return true; 1023 default: 1024 #define DECL(NAME, BASE) 1025 #define DECL_CONTEXT_BASE(NAME) \ 1026 if (D->getKind() >= Decl::first##NAME && \ 1027 D->getKind() <= Decl::last##NAME) \ 1028 return true; 1029 #include "clang/AST/DeclNodes.inc" 1030 return false; 1031 } 1032 } 1033 1034 DeclContext::~DeclContext() = default; 1035 1036 /// Find the parent context of this context that will be 1037 /// used for unqualified name lookup. 1038 /// 1039 /// Generally, the parent lookup context is the semantic context. However, for 1040 /// a friend function the parent lookup context is the lexical context, which 1041 /// is the class in which the friend is declared. 1042 DeclContext *DeclContext::getLookupParent() { 1043 // FIXME: Find a better way to identify friends. 1044 if (isa<FunctionDecl>(this)) 1045 if (getParent()->getRedeclContext()->isFileContext() && 1046 getLexicalParent()->getRedeclContext()->isRecord()) 1047 return getLexicalParent(); 1048 1049 // A lookup within the call operator of a lambda never looks in the lambda 1050 // class; instead, skip to the context in which that closure type is 1051 // declared. 1052 if (isLambdaCallOperator(this)) 1053 return getParent()->getParent(); 1054 1055 return getParent(); 1056 } 1057 1058 const BlockDecl *DeclContext::getInnermostBlockDecl() const { 1059 const DeclContext *Ctx = this; 1060 1061 do { 1062 if (Ctx->isClosure()) 1063 return cast<BlockDecl>(Ctx); 1064 Ctx = Ctx->getParent(); 1065 } while (Ctx); 1066 1067 return nullptr; 1068 } 1069 1070 bool DeclContext::isInlineNamespace() const { 1071 return isNamespace() && 1072 cast<NamespaceDecl>(this)->isInline(); 1073 } 1074 1075 bool DeclContext::isStdNamespace() const { 1076 if (!isNamespace()) 1077 return false; 1078 1079 const auto *ND = cast<NamespaceDecl>(this); 1080 if (ND->isInline()) { 1081 return ND->getParent()->isStdNamespace(); 1082 } 1083 1084 if (!getParent()->getRedeclContext()->isTranslationUnit()) 1085 return false; 1086 1087 const IdentifierInfo *II = ND->getIdentifier(); 1088 return II && II->isStr("std"); 1089 } 1090 1091 bool DeclContext::isDependentContext() const { 1092 if (isFileContext()) 1093 return false; 1094 1095 if (isa<ClassTemplatePartialSpecializationDecl>(this)) 1096 return true; 1097 1098 if (const auto *Record = dyn_cast<CXXRecordDecl>(this)) { 1099 if (Record->getDescribedClassTemplate()) 1100 return true; 1101 1102 if (Record->isDependentLambda()) 1103 return true; 1104 } 1105 1106 if (const auto *Function = dyn_cast<FunctionDecl>(this)) { 1107 if (Function->getDescribedFunctionTemplate()) 1108 return true; 1109 1110 // Friend function declarations are dependent if their *lexical* 1111 // context is dependent. 1112 if (cast<Decl>(this)->getFriendObjectKind()) 1113 return getLexicalParent()->isDependentContext(); 1114 } 1115 1116 // FIXME: A variable template is a dependent context, but is not a 1117 // DeclContext. A context within it (such as a lambda-expression) 1118 // should be considered dependent. 1119 1120 return getParent() && getParent()->isDependentContext(); 1121 } 1122 1123 bool DeclContext::isTransparentContext() const { 1124 if (getDeclKind() == Decl::Enum) 1125 return !cast<EnumDecl>(this)->isScoped(); 1126 else if (getDeclKind() == Decl::LinkageSpec || getDeclKind() == Decl::Export) 1127 return true; 1128 1129 return false; 1130 } 1131 1132 static bool isLinkageSpecContext(const DeclContext *DC, 1133 LinkageSpecDecl::LanguageIDs ID) { 1134 while (DC->getDeclKind() != Decl::TranslationUnit) { 1135 if (DC->getDeclKind() == Decl::LinkageSpec) 1136 return cast<LinkageSpecDecl>(DC)->getLanguage() == ID; 1137 DC = DC->getLexicalParent(); 1138 } 1139 return false; 1140 } 1141 1142 bool DeclContext::isExternCContext() const { 1143 return isLinkageSpecContext(this, LinkageSpecDecl::lang_c); 1144 } 1145 1146 const LinkageSpecDecl *DeclContext::getExternCContext() const { 1147 const DeclContext *DC = this; 1148 while (DC->getDeclKind() != Decl::TranslationUnit) { 1149 if (DC->getDeclKind() == Decl::LinkageSpec && 1150 cast<LinkageSpecDecl>(DC)->getLanguage() == LinkageSpecDecl::lang_c) 1151 return cast<LinkageSpecDecl>(DC); 1152 DC = DC->getLexicalParent(); 1153 } 1154 return nullptr; 1155 } 1156 1157 bool DeclContext::isExternCXXContext() const { 1158 return isLinkageSpecContext(this, LinkageSpecDecl::lang_cxx); 1159 } 1160 1161 bool DeclContext::Encloses(const DeclContext *DC) const { 1162 if (getPrimaryContext() != this) 1163 return getPrimaryContext()->Encloses(DC); 1164 1165 for (; DC; DC = DC->getParent()) 1166 if (DC->getPrimaryContext() == this) 1167 return true; 1168 return false; 1169 } 1170 1171 DeclContext *DeclContext::getPrimaryContext() { 1172 switch (getDeclKind()) { 1173 case Decl::TranslationUnit: 1174 case Decl::ExternCContext: 1175 case Decl::LinkageSpec: 1176 case Decl::Export: 1177 case Decl::Block: 1178 case Decl::Captured: 1179 case Decl::OMPDeclareReduction: 1180 case Decl::OMPDeclareMapper: 1181 case Decl::RequiresExprBody: 1182 // There is only one DeclContext for these entities. 1183 return this; 1184 1185 case Decl::Namespace: 1186 // The original namespace is our primary context. 1187 return static_cast<NamespaceDecl *>(this)->getOriginalNamespace(); 1188 1189 case Decl::ObjCMethod: 1190 return this; 1191 1192 case Decl::ObjCInterface: 1193 if (auto *OID = dyn_cast<ObjCInterfaceDecl>(this)) 1194 if (auto *Def = OID->getDefinition()) 1195 return Def; 1196 return this; 1197 1198 case Decl::ObjCProtocol: 1199 if (auto *OPD = dyn_cast<ObjCProtocolDecl>(this)) 1200 if (auto *Def = OPD->getDefinition()) 1201 return Def; 1202 return this; 1203 1204 case Decl::ObjCCategory: 1205 return this; 1206 1207 case Decl::ObjCImplementation: 1208 case Decl::ObjCCategoryImpl: 1209 return this; 1210 1211 default: 1212 if (getDeclKind() >= Decl::firstTag && getDeclKind() <= Decl::lastTag) { 1213 // If this is a tag type that has a definition or is currently 1214 // being defined, that definition is our primary context. 1215 auto *Tag = cast<TagDecl>(this); 1216 1217 if (TagDecl *Def = Tag->getDefinition()) 1218 return Def; 1219 1220 if (const auto *TagTy = dyn_cast<TagType>(Tag->getTypeForDecl())) { 1221 // Note, TagType::getDecl returns the (partial) definition one exists. 1222 TagDecl *PossiblePartialDef = TagTy->getDecl(); 1223 if (PossiblePartialDef->isBeingDefined()) 1224 return PossiblePartialDef; 1225 } else { 1226 assert(isa<InjectedClassNameType>(Tag->getTypeForDecl())); 1227 } 1228 1229 return Tag; 1230 } 1231 1232 assert(getDeclKind() >= Decl::firstFunction && 1233 getDeclKind() <= Decl::lastFunction && 1234 "Unknown DeclContext kind"); 1235 return this; 1236 } 1237 } 1238 1239 void 1240 DeclContext::collectAllContexts(SmallVectorImpl<DeclContext *> &Contexts){ 1241 Contexts.clear(); 1242 1243 if (getDeclKind() != Decl::Namespace) { 1244 Contexts.push_back(this); 1245 return; 1246 } 1247 1248 auto *Self = static_cast<NamespaceDecl *>(this); 1249 for (NamespaceDecl *N = Self->getMostRecentDecl(); N; 1250 N = N->getPreviousDecl()) 1251 Contexts.push_back(N); 1252 1253 std::reverse(Contexts.begin(), Contexts.end()); 1254 } 1255 1256 std::pair<Decl *, Decl *> 1257 DeclContext::BuildDeclChain(ArrayRef<Decl *> Decls, 1258 bool FieldsAlreadyLoaded) { 1259 // Build up a chain of declarations via the Decl::NextInContextAndBits field. 1260 Decl *FirstNewDecl = nullptr; 1261 Decl *PrevDecl = nullptr; 1262 for (auto *D : Decls) { 1263 if (FieldsAlreadyLoaded && isa<FieldDecl>(D)) 1264 continue; 1265 1266 if (PrevDecl) 1267 PrevDecl->NextInContextAndBits.setPointer(D); 1268 else 1269 FirstNewDecl = D; 1270 1271 PrevDecl = D; 1272 } 1273 1274 return std::make_pair(FirstNewDecl, PrevDecl); 1275 } 1276 1277 /// We have just acquired external visible storage, and we already have 1278 /// built a lookup map. For every name in the map, pull in the new names from 1279 /// the external storage. 1280 void DeclContext::reconcileExternalVisibleStorage() const { 1281 assert(hasNeedToReconcileExternalVisibleStorage() && LookupPtr); 1282 setNeedToReconcileExternalVisibleStorage(false); 1283 1284 for (auto &Lookup : *LookupPtr) 1285 Lookup.second.setHasExternalDecls(); 1286 } 1287 1288 /// Load the declarations within this lexical storage from an 1289 /// external source. 1290 /// \return \c true if any declarations were added. 1291 bool 1292 DeclContext::LoadLexicalDeclsFromExternalStorage() const { 1293 ExternalASTSource *Source = getParentASTContext().getExternalSource(); 1294 assert(hasExternalLexicalStorage() && Source && "No external storage?"); 1295 1296 // Notify that we have a DeclContext that is initializing. 1297 ExternalASTSource::Deserializing ADeclContext(Source); 1298 1299 // Load the external declarations, if any. 1300 SmallVector<Decl*, 64> Decls; 1301 setHasExternalLexicalStorage(false); 1302 Source->FindExternalLexicalDecls(this, Decls); 1303 1304 if (Decls.empty()) 1305 return false; 1306 1307 // We may have already loaded just the fields of this record, in which case 1308 // we need to ignore them. 1309 bool FieldsAlreadyLoaded = false; 1310 if (const auto *RD = dyn_cast<RecordDecl>(this)) 1311 FieldsAlreadyLoaded = RD->hasLoadedFieldsFromExternalStorage(); 1312 1313 // Splice the newly-read declarations into the beginning of the list 1314 // of declarations. 1315 Decl *ExternalFirst, *ExternalLast; 1316 std::tie(ExternalFirst, ExternalLast) = 1317 BuildDeclChain(Decls, FieldsAlreadyLoaded); 1318 ExternalLast->NextInContextAndBits.setPointer(FirstDecl); 1319 FirstDecl = ExternalFirst; 1320 if (!LastDecl) 1321 LastDecl = ExternalLast; 1322 return true; 1323 } 1324 1325 DeclContext::lookup_result 1326 ExternalASTSource::SetNoExternalVisibleDeclsForName(const DeclContext *DC, 1327 DeclarationName Name) { 1328 ASTContext &Context = DC->getParentASTContext(); 1329 StoredDeclsMap *Map; 1330 if (!(Map = DC->LookupPtr)) 1331 Map = DC->CreateStoredDeclsMap(Context); 1332 if (DC->hasNeedToReconcileExternalVisibleStorage()) 1333 DC->reconcileExternalVisibleStorage(); 1334 1335 (*Map)[Name].removeExternalDecls(); 1336 1337 return DeclContext::lookup_result(); 1338 } 1339 1340 DeclContext::lookup_result 1341 ExternalASTSource::SetExternalVisibleDeclsForName(const DeclContext *DC, 1342 DeclarationName Name, 1343 ArrayRef<NamedDecl*> Decls) { 1344 ASTContext &Context = DC->getParentASTContext(); 1345 StoredDeclsMap *Map; 1346 if (!(Map = DC->LookupPtr)) 1347 Map = DC->CreateStoredDeclsMap(Context); 1348 if (DC->hasNeedToReconcileExternalVisibleStorage()) 1349 DC->reconcileExternalVisibleStorage(); 1350 1351 StoredDeclsList &List = (*Map)[Name]; 1352 1353 // Clear out any old external visible declarations, to avoid quadratic 1354 // performance in the redeclaration checks below. 1355 List.removeExternalDecls(); 1356 1357 if (!List.isNull()) { 1358 // We have both existing declarations and new declarations for this name. 1359 // Some of the declarations may simply replace existing ones. Handle those 1360 // first. 1361 llvm::SmallVector<unsigned, 8> Skip; 1362 for (unsigned I = 0, N = Decls.size(); I != N; ++I) 1363 if (List.HandleRedeclaration(Decls[I], /*IsKnownNewer*/false)) 1364 Skip.push_back(I); 1365 Skip.push_back(Decls.size()); 1366 1367 // Add in any new declarations. 1368 unsigned SkipPos = 0; 1369 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 1370 if (I == Skip[SkipPos]) 1371 ++SkipPos; 1372 else 1373 List.AddSubsequentDecl(Decls[I]); 1374 } 1375 } else { 1376 // Convert the array to a StoredDeclsList. 1377 for (auto *D : Decls) { 1378 if (List.isNull()) 1379 List.setOnlyValue(D); 1380 else 1381 List.AddSubsequentDecl(D); 1382 } 1383 } 1384 1385 return List.getLookupResult(); 1386 } 1387 1388 DeclContext::decl_iterator DeclContext::decls_begin() const { 1389 if (hasExternalLexicalStorage()) 1390 LoadLexicalDeclsFromExternalStorage(); 1391 return decl_iterator(FirstDecl); 1392 } 1393 1394 bool DeclContext::decls_empty() const { 1395 if (hasExternalLexicalStorage()) 1396 LoadLexicalDeclsFromExternalStorage(); 1397 1398 return !FirstDecl; 1399 } 1400 1401 bool DeclContext::containsDecl(Decl *D) const { 1402 return (D->getLexicalDeclContext() == this && 1403 (D->NextInContextAndBits.getPointer() || D == LastDecl)); 1404 } 1405 1406 bool DeclContext::containsDeclAndLoad(Decl *D) const { 1407 if (hasExternalLexicalStorage()) 1408 LoadLexicalDeclsFromExternalStorage(); 1409 return containsDecl(D); 1410 } 1411 1412 /// shouldBeHidden - Determine whether a declaration which was declared 1413 /// within its semantic context should be invisible to qualified name lookup. 1414 static bool shouldBeHidden(NamedDecl *D) { 1415 // Skip unnamed declarations. 1416 if (!D->getDeclName()) 1417 return true; 1418 1419 // Skip entities that can't be found by name lookup into a particular 1420 // context. 1421 if ((D->getIdentifierNamespace() == 0 && !isa<UsingDirectiveDecl>(D)) || 1422 D->isTemplateParameter()) 1423 return true; 1424 1425 // Skip friends and local extern declarations unless they're the first 1426 // declaration of the entity. 1427 if ((D->isLocalExternDecl() || D->getFriendObjectKind()) && 1428 D != D->getCanonicalDecl()) 1429 return true; 1430 1431 // Skip template specializations. 1432 // FIXME: This feels like a hack. Should DeclarationName support 1433 // template-ids, or is there a better way to keep specializations 1434 // from being visible? 1435 if (isa<ClassTemplateSpecializationDecl>(D)) 1436 return true; 1437 if (auto *FD = dyn_cast<FunctionDecl>(D)) 1438 if (FD->isFunctionTemplateSpecialization()) 1439 return true; 1440 1441 return false; 1442 } 1443 1444 void DeclContext::removeDecl(Decl *D) { 1445 assert(D->getLexicalDeclContext() == this && 1446 "decl being removed from non-lexical context"); 1447 assert((D->NextInContextAndBits.getPointer() || D == LastDecl) && 1448 "decl is not in decls list"); 1449 1450 // Remove D from the decl chain. This is O(n) but hopefully rare. 1451 if (D == FirstDecl) { 1452 if (D == LastDecl) 1453 FirstDecl = LastDecl = nullptr; 1454 else 1455 FirstDecl = D->NextInContextAndBits.getPointer(); 1456 } else { 1457 for (Decl *I = FirstDecl; true; I = I->NextInContextAndBits.getPointer()) { 1458 assert(I && "decl not found in linked list"); 1459 if (I->NextInContextAndBits.getPointer() == D) { 1460 I->NextInContextAndBits.setPointer(D->NextInContextAndBits.getPointer()); 1461 if (D == LastDecl) LastDecl = I; 1462 break; 1463 } 1464 } 1465 } 1466 1467 // Mark that D is no longer in the decl chain. 1468 D->NextInContextAndBits.setPointer(nullptr); 1469 1470 // Remove D from the lookup table if necessary. 1471 if (isa<NamedDecl>(D)) { 1472 auto *ND = cast<NamedDecl>(D); 1473 1474 // Do not try to remove the declaration if that is invisible to qualified 1475 // lookup. E.g. template specializations are skipped. 1476 if (shouldBeHidden(ND)) 1477 return; 1478 1479 // Remove only decls that have a name 1480 if (!ND->getDeclName()) 1481 return; 1482 1483 auto *DC = D->getDeclContext(); 1484 do { 1485 StoredDeclsMap *Map = DC->getPrimaryContext()->LookupPtr; 1486 if (Map) { 1487 StoredDeclsMap::iterator Pos = Map->find(ND->getDeclName()); 1488 assert(Pos != Map->end() && "no lookup entry for decl"); 1489 // Remove the decl only if it is contained. 1490 StoredDeclsList::DeclsTy *Vec = Pos->second.getAsVector(); 1491 if ((Vec && is_contained(*Vec, ND)) || Pos->second.getAsDecl() == ND) 1492 Pos->second.remove(ND); 1493 } 1494 } while (DC->isTransparentContext() && (DC = DC->getParent())); 1495 } 1496 } 1497 1498 void DeclContext::addHiddenDecl(Decl *D) { 1499 assert(D->getLexicalDeclContext() == this && 1500 "Decl inserted into wrong lexical context"); 1501 assert(!D->getNextDeclInContext() && D != LastDecl && 1502 "Decl already inserted into a DeclContext"); 1503 1504 if (FirstDecl) { 1505 LastDecl->NextInContextAndBits.setPointer(D); 1506 LastDecl = D; 1507 } else { 1508 FirstDecl = LastDecl = D; 1509 } 1510 1511 // Notify a C++ record declaration that we've added a member, so it can 1512 // update its class-specific state. 1513 if (auto *Record = dyn_cast<CXXRecordDecl>(this)) 1514 Record->addedMember(D); 1515 1516 // If this is a newly-created (not de-serialized) import declaration, wire 1517 // it in to the list of local import declarations. 1518 if (!D->isFromASTFile()) { 1519 if (auto *Import = dyn_cast<ImportDecl>(D)) 1520 D->getASTContext().addedLocalImportDecl(Import); 1521 } 1522 } 1523 1524 void DeclContext::addDecl(Decl *D) { 1525 addHiddenDecl(D); 1526 1527 if (auto *ND = dyn_cast<NamedDecl>(D)) 1528 ND->getDeclContext()->getPrimaryContext()-> 1529 makeDeclVisibleInContextWithFlags(ND, false, true); 1530 } 1531 1532 void DeclContext::addDeclInternal(Decl *D) { 1533 addHiddenDecl(D); 1534 1535 if (auto *ND = dyn_cast<NamedDecl>(D)) 1536 ND->getDeclContext()->getPrimaryContext()-> 1537 makeDeclVisibleInContextWithFlags(ND, true, true); 1538 } 1539 1540 /// buildLookup - Build the lookup data structure with all of the 1541 /// declarations in this DeclContext (and any other contexts linked 1542 /// to it or transparent contexts nested within it) and return it. 1543 /// 1544 /// Note that the produced map may miss out declarations from an 1545 /// external source. If it does, those entries will be marked with 1546 /// the 'hasExternalDecls' flag. 1547 StoredDeclsMap *DeclContext::buildLookup() { 1548 assert(this == getPrimaryContext() && "buildLookup called on non-primary DC"); 1549 1550 if (!hasLazyLocalLexicalLookups() && 1551 !hasLazyExternalLexicalLookups()) 1552 return LookupPtr; 1553 1554 SmallVector<DeclContext *, 2> Contexts; 1555 collectAllContexts(Contexts); 1556 1557 if (hasLazyExternalLexicalLookups()) { 1558 setHasLazyExternalLexicalLookups(false); 1559 for (auto *DC : Contexts) { 1560 if (DC->hasExternalLexicalStorage()) { 1561 bool LoadedDecls = DC->LoadLexicalDeclsFromExternalStorage(); 1562 setHasLazyLocalLexicalLookups( 1563 hasLazyLocalLexicalLookups() | LoadedDecls ); 1564 } 1565 } 1566 1567 if (!hasLazyLocalLexicalLookups()) 1568 return LookupPtr; 1569 } 1570 1571 for (auto *DC : Contexts) 1572 buildLookupImpl(DC, hasExternalVisibleStorage()); 1573 1574 // We no longer have any lazy decls. 1575 setHasLazyLocalLexicalLookups(false); 1576 return LookupPtr; 1577 } 1578 1579 /// buildLookupImpl - Build part of the lookup data structure for the 1580 /// declarations contained within DCtx, which will either be this 1581 /// DeclContext, a DeclContext linked to it, or a transparent context 1582 /// nested within it. 1583 void DeclContext::buildLookupImpl(DeclContext *DCtx, bool Internal) { 1584 for (auto *D : DCtx->noload_decls()) { 1585 // Insert this declaration into the lookup structure, but only if 1586 // it's semantically within its decl context. Any other decls which 1587 // should be found in this context are added eagerly. 1588 // 1589 // If it's from an AST file, don't add it now. It'll get handled by 1590 // FindExternalVisibleDeclsByName if needed. Exception: if we're not 1591 // in C++, we do not track external visible decls for the TU, so in 1592 // that case we need to collect them all here. 1593 if (auto *ND = dyn_cast<NamedDecl>(D)) 1594 if (ND->getDeclContext() == DCtx && !shouldBeHidden(ND) && 1595 (!ND->isFromASTFile() || 1596 (isTranslationUnit() && 1597 !getParentASTContext().getLangOpts().CPlusPlus))) 1598 makeDeclVisibleInContextImpl(ND, Internal); 1599 1600 // If this declaration is itself a transparent declaration context 1601 // or inline namespace, add the members of this declaration of that 1602 // context (recursively). 1603 if (auto *InnerCtx = dyn_cast<DeclContext>(D)) 1604 if (InnerCtx->isTransparentContext() || InnerCtx->isInlineNamespace()) 1605 buildLookupImpl(InnerCtx, Internal); 1606 } 1607 } 1608 1609 NamedDecl *const DeclContextLookupResult::SingleElementDummyList = nullptr; 1610 1611 DeclContext::lookup_result 1612 DeclContext::lookup(DeclarationName Name) const { 1613 assert(getDeclKind() != Decl::LinkageSpec && 1614 getDeclKind() != Decl::Export && 1615 "should not perform lookups into transparent contexts"); 1616 1617 const DeclContext *PrimaryContext = getPrimaryContext(); 1618 if (PrimaryContext != this) 1619 return PrimaryContext->lookup(Name); 1620 1621 // If we have an external source, ensure that any later redeclarations of this 1622 // context have been loaded, since they may add names to the result of this 1623 // lookup (or add external visible storage). 1624 ExternalASTSource *Source = getParentASTContext().getExternalSource(); 1625 if (Source) 1626 (void)cast<Decl>(this)->getMostRecentDecl(); 1627 1628 if (hasExternalVisibleStorage()) { 1629 assert(Source && "external visible storage but no external source?"); 1630 1631 if (hasNeedToReconcileExternalVisibleStorage()) 1632 reconcileExternalVisibleStorage(); 1633 1634 StoredDeclsMap *Map = LookupPtr; 1635 1636 if (hasLazyLocalLexicalLookups() || 1637 hasLazyExternalLexicalLookups()) 1638 // FIXME: Make buildLookup const? 1639 Map = const_cast<DeclContext*>(this)->buildLookup(); 1640 1641 if (!Map) 1642 Map = CreateStoredDeclsMap(getParentASTContext()); 1643 1644 // If we have a lookup result with no external decls, we are done. 1645 std::pair<StoredDeclsMap::iterator, bool> R = 1646 Map->insert(std::make_pair(Name, StoredDeclsList())); 1647 if (!R.second && !R.first->second.hasExternalDecls()) 1648 return R.first->second.getLookupResult(); 1649 1650 if (Source->FindExternalVisibleDeclsByName(this, Name) || !R.second) { 1651 if (StoredDeclsMap *Map = LookupPtr) { 1652 StoredDeclsMap::iterator I = Map->find(Name); 1653 if (I != Map->end()) 1654 return I->second.getLookupResult(); 1655 } 1656 } 1657 1658 return {}; 1659 } 1660 1661 StoredDeclsMap *Map = LookupPtr; 1662 if (hasLazyLocalLexicalLookups() || 1663 hasLazyExternalLexicalLookups()) 1664 Map = const_cast<DeclContext*>(this)->buildLookup(); 1665 1666 if (!Map) 1667 return {}; 1668 1669 StoredDeclsMap::iterator I = Map->find(Name); 1670 if (I == Map->end()) 1671 return {}; 1672 1673 return I->second.getLookupResult(); 1674 } 1675 1676 DeclContext::lookup_result 1677 DeclContext::noload_lookup(DeclarationName Name) { 1678 assert(getDeclKind() != Decl::LinkageSpec && 1679 getDeclKind() != Decl::Export && 1680 "should not perform lookups into transparent contexts"); 1681 1682 DeclContext *PrimaryContext = getPrimaryContext(); 1683 if (PrimaryContext != this) 1684 return PrimaryContext->noload_lookup(Name); 1685 1686 loadLazyLocalLexicalLookups(); 1687 StoredDeclsMap *Map = LookupPtr; 1688 if (!Map) 1689 return {}; 1690 1691 StoredDeclsMap::iterator I = Map->find(Name); 1692 return I != Map->end() ? I->second.getLookupResult() 1693 : lookup_result(); 1694 } 1695 1696 // If we have any lazy lexical declarations not in our lookup map, add them 1697 // now. Don't import any external declarations, not even if we know we have 1698 // some missing from the external visible lookups. 1699 void DeclContext::loadLazyLocalLexicalLookups() { 1700 if (hasLazyLocalLexicalLookups()) { 1701 SmallVector<DeclContext *, 2> Contexts; 1702 collectAllContexts(Contexts); 1703 for (auto *Context : Contexts) 1704 buildLookupImpl(Context, hasExternalVisibleStorage()); 1705 setHasLazyLocalLexicalLookups(false); 1706 } 1707 } 1708 1709 void DeclContext::localUncachedLookup(DeclarationName Name, 1710 SmallVectorImpl<NamedDecl *> &Results) { 1711 Results.clear(); 1712 1713 // If there's no external storage, just perform a normal lookup and copy 1714 // the results. 1715 if (!hasExternalVisibleStorage() && !hasExternalLexicalStorage() && Name) { 1716 lookup_result LookupResults = lookup(Name); 1717 Results.insert(Results.end(), LookupResults.begin(), LookupResults.end()); 1718 return; 1719 } 1720 1721 // If we have a lookup table, check there first. Maybe we'll get lucky. 1722 // FIXME: Should we be checking these flags on the primary context? 1723 if (Name && !hasLazyLocalLexicalLookups() && 1724 !hasLazyExternalLexicalLookups()) { 1725 if (StoredDeclsMap *Map = LookupPtr) { 1726 StoredDeclsMap::iterator Pos = Map->find(Name); 1727 if (Pos != Map->end()) { 1728 Results.insert(Results.end(), 1729 Pos->second.getLookupResult().begin(), 1730 Pos->second.getLookupResult().end()); 1731 return; 1732 } 1733 } 1734 } 1735 1736 // Slow case: grovel through the declarations in our chain looking for 1737 // matches. 1738 // FIXME: If we have lazy external declarations, this will not find them! 1739 // FIXME: Should we CollectAllContexts and walk them all here? 1740 for (Decl *D = FirstDecl; D; D = D->getNextDeclInContext()) { 1741 if (auto *ND = dyn_cast<NamedDecl>(D)) 1742 if (ND->getDeclName() == Name) 1743 Results.push_back(ND); 1744 } 1745 } 1746 1747 DeclContext *DeclContext::getRedeclContext() { 1748 DeclContext *Ctx = this; 1749 1750 // In C, a record type is the redeclaration context for its fields only. If 1751 // we arrive at a record context after skipping anything else, we should skip 1752 // the record as well. Currently, this means skipping enumerations because 1753 // they're the only transparent context that can exist within a struct or 1754 // union. 1755 bool SkipRecords = getDeclKind() == Decl::Kind::Enum && 1756 !getParentASTContext().getLangOpts().CPlusPlus; 1757 1758 // Skip through contexts to get to the redeclaration context. Transparent 1759 // contexts are always skipped. 1760 while ((SkipRecords && Ctx->isRecord()) || Ctx->isTransparentContext()) 1761 Ctx = Ctx->getParent(); 1762 return Ctx; 1763 } 1764 1765 DeclContext *DeclContext::getEnclosingNamespaceContext() { 1766 DeclContext *Ctx = this; 1767 // Skip through non-namespace, non-translation-unit contexts. 1768 while (!Ctx->isFileContext()) 1769 Ctx = Ctx->getParent(); 1770 return Ctx->getPrimaryContext(); 1771 } 1772 1773 RecordDecl *DeclContext::getOuterLexicalRecordContext() { 1774 // Loop until we find a non-record context. 1775 RecordDecl *OutermostRD = nullptr; 1776 DeclContext *DC = this; 1777 while (DC->isRecord()) { 1778 OutermostRD = cast<RecordDecl>(DC); 1779 DC = DC->getLexicalParent(); 1780 } 1781 return OutermostRD; 1782 } 1783 1784 bool DeclContext::InEnclosingNamespaceSetOf(const DeclContext *O) const { 1785 // For non-file contexts, this is equivalent to Equals. 1786 if (!isFileContext()) 1787 return O->Equals(this); 1788 1789 do { 1790 if (O->Equals(this)) 1791 return true; 1792 1793 const auto *NS = dyn_cast<NamespaceDecl>(O); 1794 if (!NS || !NS->isInline()) 1795 break; 1796 O = NS->getParent(); 1797 } while (O); 1798 1799 return false; 1800 } 1801 1802 void DeclContext::makeDeclVisibleInContext(NamedDecl *D) { 1803 DeclContext *PrimaryDC = this->getPrimaryContext(); 1804 DeclContext *DeclDC = D->getDeclContext()->getPrimaryContext(); 1805 // If the decl is being added outside of its semantic decl context, we 1806 // need to ensure that we eagerly build the lookup information for it. 1807 PrimaryDC->makeDeclVisibleInContextWithFlags(D, false, PrimaryDC == DeclDC); 1808 } 1809 1810 void DeclContext::makeDeclVisibleInContextWithFlags(NamedDecl *D, bool Internal, 1811 bool Recoverable) { 1812 assert(this == getPrimaryContext() && "expected a primary DC"); 1813 1814 if (!isLookupContext()) { 1815 if (isTransparentContext()) 1816 getParent()->getPrimaryContext() 1817 ->makeDeclVisibleInContextWithFlags(D, Internal, Recoverable); 1818 return; 1819 } 1820 1821 // Skip declarations which should be invisible to name lookup. 1822 if (shouldBeHidden(D)) 1823 return; 1824 1825 // If we already have a lookup data structure, perform the insertion into 1826 // it. If we might have externally-stored decls with this name, look them 1827 // up and perform the insertion. If this decl was declared outside its 1828 // semantic context, buildLookup won't add it, so add it now. 1829 // 1830 // FIXME: As a performance hack, don't add such decls into the translation 1831 // unit unless we're in C++, since qualified lookup into the TU is never 1832 // performed. 1833 if (LookupPtr || hasExternalVisibleStorage() || 1834 ((!Recoverable || D->getDeclContext() != D->getLexicalDeclContext()) && 1835 (getParentASTContext().getLangOpts().CPlusPlus || 1836 !isTranslationUnit()))) { 1837 // If we have lazily omitted any decls, they might have the same name as 1838 // the decl which we are adding, so build a full lookup table before adding 1839 // this decl. 1840 buildLookup(); 1841 makeDeclVisibleInContextImpl(D, Internal); 1842 } else { 1843 setHasLazyLocalLexicalLookups(true); 1844 } 1845 1846 // If we are a transparent context or inline namespace, insert into our 1847 // parent context, too. This operation is recursive. 1848 if (isTransparentContext() || isInlineNamespace()) 1849 getParent()->getPrimaryContext()-> 1850 makeDeclVisibleInContextWithFlags(D, Internal, Recoverable); 1851 1852 auto *DCAsDecl = cast<Decl>(this); 1853 // Notify that a decl was made visible unless we are a Tag being defined. 1854 if (!(isa<TagDecl>(DCAsDecl) && cast<TagDecl>(DCAsDecl)->isBeingDefined())) 1855 if (ASTMutationListener *L = DCAsDecl->getASTMutationListener()) 1856 L->AddedVisibleDecl(this, D); 1857 } 1858 1859 void DeclContext::makeDeclVisibleInContextImpl(NamedDecl *D, bool Internal) { 1860 // Find or create the stored declaration map. 1861 StoredDeclsMap *Map = LookupPtr; 1862 if (!Map) { 1863 ASTContext *C = &getParentASTContext(); 1864 Map = CreateStoredDeclsMap(*C); 1865 } 1866 1867 // If there is an external AST source, load any declarations it knows about 1868 // with this declaration's name. 1869 // If the lookup table contains an entry about this name it means that we 1870 // have already checked the external source. 1871 if (!Internal) 1872 if (ExternalASTSource *Source = getParentASTContext().getExternalSource()) 1873 if (hasExternalVisibleStorage() && 1874 Map->find(D->getDeclName()) == Map->end()) 1875 Source->FindExternalVisibleDeclsByName(this, D->getDeclName()); 1876 1877 // Insert this declaration into the map. 1878 StoredDeclsList &DeclNameEntries = (*Map)[D->getDeclName()]; 1879 1880 if (Internal) { 1881 // If this is being added as part of loading an external declaration, 1882 // this may not be the only external declaration with this name. 1883 // In this case, we never try to replace an existing declaration; we'll 1884 // handle that when we finalize the list of declarations for this name. 1885 DeclNameEntries.setHasExternalDecls(); 1886 DeclNameEntries.AddSubsequentDecl(D); 1887 return; 1888 } 1889 1890 if (DeclNameEntries.isNull()) { 1891 DeclNameEntries.setOnlyValue(D); 1892 return; 1893 } 1894 1895 if (DeclNameEntries.HandleRedeclaration(D, /*IsKnownNewer*/!Internal)) { 1896 // This declaration has replaced an existing one for which 1897 // declarationReplaces returns true. 1898 return; 1899 } 1900 1901 // Put this declaration into the appropriate slot. 1902 DeclNameEntries.AddSubsequentDecl(D); 1903 } 1904 1905 UsingDirectiveDecl *DeclContext::udir_iterator::operator*() const { 1906 return cast<UsingDirectiveDecl>(*I); 1907 } 1908 1909 /// Returns iterator range [First, Last) of UsingDirectiveDecls stored within 1910 /// this context. 1911 DeclContext::udir_range DeclContext::using_directives() const { 1912 // FIXME: Use something more efficient than normal lookup for using 1913 // directives. In C++, using directives are looked up more than anything else. 1914 lookup_result Result = lookup(UsingDirectiveDecl::getName()); 1915 return udir_range(Result.begin(), Result.end()); 1916 } 1917 1918 //===----------------------------------------------------------------------===// 1919 // Creation and Destruction of StoredDeclsMaps. // 1920 //===----------------------------------------------------------------------===// 1921 1922 StoredDeclsMap *DeclContext::CreateStoredDeclsMap(ASTContext &C) const { 1923 assert(!LookupPtr && "context already has a decls map"); 1924 assert(getPrimaryContext() == this && 1925 "creating decls map on non-primary context"); 1926 1927 StoredDeclsMap *M; 1928 bool Dependent = isDependentContext(); 1929 if (Dependent) 1930 M = new DependentStoredDeclsMap(); 1931 else 1932 M = new StoredDeclsMap(); 1933 M->Previous = C.LastSDM; 1934 C.LastSDM = llvm::PointerIntPair<StoredDeclsMap*,1>(M, Dependent); 1935 LookupPtr = M; 1936 return M; 1937 } 1938 1939 void ASTContext::ReleaseDeclContextMaps() { 1940 // It's okay to delete DependentStoredDeclsMaps via a StoredDeclsMap 1941 // pointer because the subclass doesn't add anything that needs to 1942 // be deleted. 1943 StoredDeclsMap::DestroyAll(LastSDM.getPointer(), LastSDM.getInt()); 1944 } 1945 1946 void StoredDeclsMap::DestroyAll(StoredDeclsMap *Map, bool Dependent) { 1947 while (Map) { 1948 // Advance the iteration before we invalidate memory. 1949 llvm::PointerIntPair<StoredDeclsMap*,1> Next = Map->Previous; 1950 1951 if (Dependent) 1952 delete static_cast<DependentStoredDeclsMap*>(Map); 1953 else 1954 delete Map; 1955 1956 Map = Next.getPointer(); 1957 Dependent = Next.getInt(); 1958 } 1959 } 1960 1961 DependentDiagnostic *DependentDiagnostic::Create(ASTContext &C, 1962 DeclContext *Parent, 1963 const PartialDiagnostic &PDiag) { 1964 assert(Parent->isDependentContext() 1965 && "cannot iterate dependent diagnostics of non-dependent context"); 1966 Parent = Parent->getPrimaryContext(); 1967 if (!Parent->LookupPtr) 1968 Parent->CreateStoredDeclsMap(C); 1969 1970 auto *Map = static_cast<DependentStoredDeclsMap *>(Parent->LookupPtr); 1971 1972 // Allocate the copy of the PartialDiagnostic via the ASTContext's 1973 // BumpPtrAllocator, rather than the ASTContext itself. 1974 PartialDiagnostic::Storage *DiagStorage = nullptr; 1975 if (PDiag.hasStorage()) 1976 DiagStorage = new (C) PartialDiagnostic::Storage; 1977 1978 auto *DD = new (C) DependentDiagnostic(PDiag, DiagStorage); 1979 1980 // TODO: Maybe we shouldn't reverse the order during insertion. 1981 DD->NextDiagnostic = Map->FirstDiagnostic; 1982 Map->FirstDiagnostic = DD; 1983 1984 return DD; 1985 } 1986