1 //===--- DeclBase.cpp - Declaration AST Node Implementation ---------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements the Decl and DeclContext classes. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "clang/AST/DeclBase.h" 15 #include "clang/AST/ASTContext.h" 16 #include "clang/AST/ASTMutationListener.h" 17 #include "clang/AST/Attr.h" 18 #include "clang/AST/Decl.h" 19 #include "clang/AST/DeclCXX.h" 20 #include "clang/AST/DeclContextInternals.h" 21 #include "clang/AST/DeclFriend.h" 22 #include "clang/AST/DeclObjC.h" 23 #include "clang/AST/DeclOpenMP.h" 24 #include "clang/AST/DeclTemplate.h" 25 #include "clang/AST/DependentDiagnostic.h" 26 #include "clang/AST/ExternalASTSource.h" 27 #include "clang/AST/Stmt.h" 28 #include "clang/AST/StmtCXX.h" 29 #include "clang/AST/Type.h" 30 #include "clang/Basic/TargetInfo.h" 31 #include "llvm/ADT/DenseMap.h" 32 #include "llvm/Support/raw_ostream.h" 33 #include <algorithm> 34 using namespace clang; 35 36 //===----------------------------------------------------------------------===// 37 // Statistics 38 //===----------------------------------------------------------------------===// 39 40 #define DECL(DERIVED, BASE) static int n##DERIVED##s = 0; 41 #define ABSTRACT_DECL(DECL) 42 #include "clang/AST/DeclNodes.inc" 43 44 void Decl::updateOutOfDate(IdentifierInfo &II) const { 45 getASTContext().getExternalSource()->updateOutOfDateIdentifier(II); 46 } 47 48 #define DECL(DERIVED, BASE) \ 49 static_assert(llvm::AlignOf<Decl>::Alignment >= \ 50 llvm::AlignOf<DERIVED##Decl>::Alignment, \ 51 "Alignment sufficient after objects prepended to " #DERIVED); 52 #define ABSTRACT_DECL(DECL) 53 #include "clang/AST/DeclNodes.inc" 54 55 void *Decl::operator new(std::size_t Size, const ASTContext &Context, 56 unsigned ID, std::size_t Extra) { 57 // Allocate an extra 8 bytes worth of storage, which ensures that the 58 // resulting pointer will still be 8-byte aligned. 59 static_assert(sizeof(unsigned) * 2 >= llvm::AlignOf<Decl>::Alignment, 60 "Decl won't be misaligned"); 61 void *Start = Context.Allocate(Size + Extra + 8); 62 void *Result = (char*)Start + 8; 63 64 unsigned *PrefixPtr = (unsigned *)Result - 2; 65 66 // Zero out the first 4 bytes; this is used to store the owning module ID. 67 PrefixPtr[0] = 0; 68 69 // Store the global declaration ID in the second 4 bytes. 70 PrefixPtr[1] = ID; 71 72 return Result; 73 } 74 75 void *Decl::operator new(std::size_t Size, const ASTContext &Ctx, 76 DeclContext *Parent, std::size_t Extra) { 77 assert(!Parent || &Parent->getParentASTContext() == &Ctx); 78 // With local visibility enabled, we track the owning module even for local 79 // declarations. 80 if (Ctx.getLangOpts().ModulesLocalVisibility) { 81 // Ensure required alignment of the resulting object by adding extra 82 // padding at the start if required. 83 size_t ExtraAlign = 84 llvm::OffsetToAlignment(sizeof(Module *), 85 llvm::AlignOf<Decl>::Alignment); 86 char *Buffer = reinterpret_cast<char *>( 87 ::operator new(ExtraAlign + sizeof(Module *) + Size + Extra, Ctx)); 88 Buffer += ExtraAlign; 89 return new (Buffer) Module*(nullptr) + 1; 90 } 91 return ::operator new(Size + Extra, Ctx); 92 } 93 94 Module *Decl::getOwningModuleSlow() const { 95 assert(isFromASTFile() && "Not from AST file?"); 96 return getASTContext().getExternalSource()->getModule(getOwningModuleID()); 97 } 98 99 bool Decl::hasLocalOwningModuleStorage() const { 100 return getASTContext().getLangOpts().ModulesLocalVisibility; 101 } 102 103 const char *Decl::getDeclKindName() const { 104 switch (DeclKind) { 105 default: llvm_unreachable("Declaration not in DeclNodes.inc!"); 106 #define DECL(DERIVED, BASE) case DERIVED: return #DERIVED; 107 #define ABSTRACT_DECL(DECL) 108 #include "clang/AST/DeclNodes.inc" 109 } 110 } 111 112 void Decl::setInvalidDecl(bool Invalid) { 113 InvalidDecl = Invalid; 114 assert(!isa<TagDecl>(this) || !cast<TagDecl>(this)->isCompleteDefinition()); 115 if (Invalid && !isa<ParmVarDecl>(this)) { 116 // Defensive maneuver for ill-formed code: we're likely not to make it to 117 // a point where we set the access specifier, so default it to "public" 118 // to avoid triggering asserts elsewhere in the front end. 119 setAccess(AS_public); 120 } 121 } 122 123 const char *DeclContext::getDeclKindName() const { 124 switch (DeclKind) { 125 default: llvm_unreachable("Declaration context not in DeclNodes.inc!"); 126 #define DECL(DERIVED, BASE) case Decl::DERIVED: return #DERIVED; 127 #define ABSTRACT_DECL(DECL) 128 #include "clang/AST/DeclNodes.inc" 129 } 130 } 131 132 bool Decl::StatisticsEnabled = false; 133 void Decl::EnableStatistics() { 134 StatisticsEnabled = true; 135 } 136 137 void Decl::PrintStats() { 138 llvm::errs() << "\n*** Decl Stats:\n"; 139 140 int totalDecls = 0; 141 #define DECL(DERIVED, BASE) totalDecls += n##DERIVED##s; 142 #define ABSTRACT_DECL(DECL) 143 #include "clang/AST/DeclNodes.inc" 144 llvm::errs() << " " << totalDecls << " decls total.\n"; 145 146 int totalBytes = 0; 147 #define DECL(DERIVED, BASE) \ 148 if (n##DERIVED##s > 0) { \ 149 totalBytes += (int)(n##DERIVED##s * sizeof(DERIVED##Decl)); \ 150 llvm::errs() << " " << n##DERIVED##s << " " #DERIVED " decls, " \ 151 << sizeof(DERIVED##Decl) << " each (" \ 152 << n##DERIVED##s * sizeof(DERIVED##Decl) \ 153 << " bytes)\n"; \ 154 } 155 #define ABSTRACT_DECL(DECL) 156 #include "clang/AST/DeclNodes.inc" 157 158 llvm::errs() << "Total bytes = " << totalBytes << "\n"; 159 } 160 161 void Decl::add(Kind k) { 162 switch (k) { 163 #define DECL(DERIVED, BASE) case DERIVED: ++n##DERIVED##s; break; 164 #define ABSTRACT_DECL(DECL) 165 #include "clang/AST/DeclNodes.inc" 166 } 167 } 168 169 bool Decl::isTemplateParameterPack() const { 170 if (const TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(this)) 171 return TTP->isParameterPack(); 172 if (const NonTypeTemplateParmDecl *NTTP 173 = dyn_cast<NonTypeTemplateParmDecl>(this)) 174 return NTTP->isParameterPack(); 175 if (const TemplateTemplateParmDecl *TTP 176 = dyn_cast<TemplateTemplateParmDecl>(this)) 177 return TTP->isParameterPack(); 178 return false; 179 } 180 181 bool Decl::isParameterPack() const { 182 if (const ParmVarDecl *Parm = dyn_cast<ParmVarDecl>(this)) 183 return Parm->isParameterPack(); 184 185 return isTemplateParameterPack(); 186 } 187 188 FunctionDecl *Decl::getAsFunction() { 189 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(this)) 190 return FD; 191 if (const FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(this)) 192 return FTD->getTemplatedDecl(); 193 return nullptr; 194 } 195 196 bool Decl::isTemplateDecl() const { 197 return isa<TemplateDecl>(this); 198 } 199 200 TemplateDecl *Decl::getDescribedTemplate() const { 201 if (auto *FD = dyn_cast<FunctionDecl>(this)) 202 return FD->getDescribedFunctionTemplate(); 203 else if (auto *RD = dyn_cast<CXXRecordDecl>(this)) 204 return RD->getDescribedClassTemplate(); 205 else if (auto *VD = dyn_cast<VarDecl>(this)) 206 return VD->getDescribedVarTemplate(); 207 208 return nullptr; 209 } 210 211 const DeclContext *Decl::getParentFunctionOrMethod() const { 212 for (const DeclContext *DC = getDeclContext(); 213 DC && !DC->isTranslationUnit() && !DC->isNamespace(); 214 DC = DC->getParent()) 215 if (DC->isFunctionOrMethod()) 216 return DC; 217 218 return nullptr; 219 } 220 221 222 //===----------------------------------------------------------------------===// 223 // PrettyStackTraceDecl Implementation 224 //===----------------------------------------------------------------------===// 225 226 void PrettyStackTraceDecl::print(raw_ostream &OS) const { 227 SourceLocation TheLoc = Loc; 228 if (TheLoc.isInvalid() && TheDecl) 229 TheLoc = TheDecl->getLocation(); 230 231 if (TheLoc.isValid()) { 232 TheLoc.print(OS, SM); 233 OS << ": "; 234 } 235 236 OS << Message; 237 238 if (const NamedDecl *DN = dyn_cast_or_null<NamedDecl>(TheDecl)) { 239 OS << " '"; 240 DN->printQualifiedName(OS); 241 OS << '\''; 242 } 243 OS << '\n'; 244 } 245 246 //===----------------------------------------------------------------------===// 247 // Decl Implementation 248 //===----------------------------------------------------------------------===// 249 250 // Out-of-line virtual method providing a home for Decl. 251 Decl::~Decl() { } 252 253 void Decl::setDeclContext(DeclContext *DC) { 254 DeclCtx = DC; 255 } 256 257 void Decl::setLexicalDeclContext(DeclContext *DC) { 258 if (DC == getLexicalDeclContext()) 259 return; 260 261 if (isInSemaDC()) { 262 setDeclContextsImpl(getDeclContext(), DC, getASTContext()); 263 } else { 264 getMultipleDC()->LexicalDC = DC; 265 } 266 Hidden = cast<Decl>(DC)->Hidden; 267 } 268 269 void Decl::setDeclContextsImpl(DeclContext *SemaDC, DeclContext *LexicalDC, 270 ASTContext &Ctx) { 271 if (SemaDC == LexicalDC) { 272 DeclCtx = SemaDC; 273 } else { 274 Decl::MultipleDC *MDC = new (Ctx) Decl::MultipleDC(); 275 MDC->SemanticDC = SemaDC; 276 MDC->LexicalDC = LexicalDC; 277 DeclCtx = MDC; 278 } 279 } 280 281 bool Decl::isLexicallyWithinFunctionOrMethod() const { 282 const DeclContext *LDC = getLexicalDeclContext(); 283 while (true) { 284 if (LDC->isFunctionOrMethod()) 285 return true; 286 if (!isa<TagDecl>(LDC)) 287 return false; 288 LDC = LDC->getLexicalParent(); 289 } 290 return false; 291 } 292 293 bool Decl::isInAnonymousNamespace() const { 294 const DeclContext *DC = getDeclContext(); 295 do { 296 if (const NamespaceDecl *ND = dyn_cast<NamespaceDecl>(DC)) 297 if (ND->isAnonymousNamespace()) 298 return true; 299 } while ((DC = DC->getParent())); 300 301 return false; 302 } 303 304 bool Decl::isInStdNamespace() const { 305 return getDeclContext()->isStdNamespace(); 306 } 307 308 TranslationUnitDecl *Decl::getTranslationUnitDecl() { 309 if (TranslationUnitDecl *TUD = dyn_cast<TranslationUnitDecl>(this)) 310 return TUD; 311 312 DeclContext *DC = getDeclContext(); 313 assert(DC && "This decl is not contained in a translation unit!"); 314 315 while (!DC->isTranslationUnit()) { 316 DC = DC->getParent(); 317 assert(DC && "This decl is not contained in a translation unit!"); 318 } 319 320 return cast<TranslationUnitDecl>(DC); 321 } 322 323 ASTContext &Decl::getASTContext() const { 324 return getTranslationUnitDecl()->getASTContext(); 325 } 326 327 ASTMutationListener *Decl::getASTMutationListener() const { 328 return getASTContext().getASTMutationListener(); 329 } 330 331 unsigned Decl::getMaxAlignment() const { 332 if (!hasAttrs()) 333 return 0; 334 335 unsigned Align = 0; 336 const AttrVec &V = getAttrs(); 337 ASTContext &Ctx = getASTContext(); 338 specific_attr_iterator<AlignedAttr> I(V.begin()), E(V.end()); 339 for (; I != E; ++I) 340 Align = std::max(Align, I->getAlignment(Ctx)); 341 return Align; 342 } 343 344 bool Decl::isUsed(bool CheckUsedAttr) const { 345 const Decl *CanonD = getCanonicalDecl(); 346 if (CanonD->Used) 347 return true; 348 349 // Check for used attribute. 350 // Ask the most recent decl, since attributes accumulate in the redecl chain. 351 if (CheckUsedAttr && getMostRecentDecl()->hasAttr<UsedAttr>()) 352 return true; 353 354 // The information may have not been deserialized yet. Force deserialization 355 // to complete the needed information. 356 return getMostRecentDecl()->getCanonicalDecl()->Used; 357 } 358 359 void Decl::markUsed(ASTContext &C) { 360 if (isUsed(false)) 361 return; 362 363 if (C.getASTMutationListener()) 364 C.getASTMutationListener()->DeclarationMarkedUsed(this); 365 366 setIsUsed(); 367 } 368 369 bool Decl::isReferenced() const { 370 if (Referenced) 371 return true; 372 373 // Check redeclarations. 374 for (auto I : redecls()) 375 if (I->Referenced) 376 return true; 377 378 return false; 379 } 380 381 bool Decl::hasDefiningAttr() const { 382 return hasAttr<AliasAttr>() || hasAttr<IFuncAttr>(); 383 } 384 385 const Attr *Decl::getDefiningAttr() const { 386 if (AliasAttr *AA = getAttr<AliasAttr>()) 387 return AA; 388 if (IFuncAttr *IFA = getAttr<IFuncAttr>()) 389 return IFA; 390 return nullptr; 391 } 392 393 /// \brief Determine the availability of the given declaration based on 394 /// the target platform. 395 /// 396 /// When it returns an availability result other than \c AR_Available, 397 /// if the \p Message parameter is non-NULL, it will be set to a 398 /// string describing why the entity is unavailable. 399 /// 400 /// FIXME: Make these strings localizable, since they end up in 401 /// diagnostics. 402 static AvailabilityResult CheckAvailability(ASTContext &Context, 403 const AvailabilityAttr *A, 404 std::string *Message) { 405 VersionTuple TargetMinVersion = 406 Context.getTargetInfo().getPlatformMinVersion(); 407 408 if (TargetMinVersion.empty()) 409 return AR_Available; 410 411 // Check if this is an App Extension "platform", and if so chop off 412 // the suffix for matching with the actual platform. 413 StringRef ActualPlatform = A->getPlatform()->getName(); 414 StringRef RealizedPlatform = ActualPlatform; 415 if (Context.getLangOpts().AppExt) { 416 size_t suffix = RealizedPlatform.rfind("_app_extension"); 417 if (suffix != StringRef::npos) 418 RealizedPlatform = RealizedPlatform.slice(0, suffix); 419 } 420 421 StringRef TargetPlatform = Context.getTargetInfo().getPlatformName(); 422 423 // Match the platform name. 424 if (RealizedPlatform != TargetPlatform) 425 return AR_Available; 426 427 StringRef PrettyPlatformName 428 = AvailabilityAttr::getPrettyPlatformName(ActualPlatform); 429 430 if (PrettyPlatformName.empty()) 431 PrettyPlatformName = ActualPlatform; 432 433 std::string HintMessage; 434 if (!A->getMessage().empty()) { 435 HintMessage = " - "; 436 HintMessage += A->getMessage(); 437 } 438 439 // Make sure that this declaration has not been marked 'unavailable'. 440 if (A->getUnavailable()) { 441 if (Message) { 442 Message->clear(); 443 llvm::raw_string_ostream Out(*Message); 444 Out << "not available on " << PrettyPlatformName 445 << HintMessage; 446 } 447 448 return AR_Unavailable; 449 } 450 451 // Make sure that this declaration has already been introduced. 452 if (!A->getIntroduced().empty() && 453 TargetMinVersion < A->getIntroduced()) { 454 if (Message) { 455 Message->clear(); 456 llvm::raw_string_ostream Out(*Message); 457 VersionTuple VTI(A->getIntroduced()); 458 VTI.UseDotAsSeparator(); 459 Out << "introduced in " << PrettyPlatformName << ' ' 460 << VTI << HintMessage; 461 } 462 463 return A->getStrict() ? AR_Unavailable : AR_NotYetIntroduced; 464 } 465 466 // Make sure that this declaration hasn't been obsoleted. 467 if (!A->getObsoleted().empty() && TargetMinVersion >= A->getObsoleted()) { 468 if (Message) { 469 Message->clear(); 470 llvm::raw_string_ostream Out(*Message); 471 VersionTuple VTO(A->getObsoleted()); 472 VTO.UseDotAsSeparator(); 473 Out << "obsoleted in " << PrettyPlatformName << ' ' 474 << VTO << HintMessage; 475 } 476 477 return AR_Unavailable; 478 } 479 480 // Make sure that this declaration hasn't been deprecated. 481 if (!A->getDeprecated().empty() && TargetMinVersion >= A->getDeprecated()) { 482 if (Message) { 483 Message->clear(); 484 llvm::raw_string_ostream Out(*Message); 485 VersionTuple VTD(A->getDeprecated()); 486 VTD.UseDotAsSeparator(); 487 Out << "first deprecated in " << PrettyPlatformName << ' ' 488 << VTD << HintMessage; 489 } 490 491 return AR_Deprecated; 492 } 493 494 return AR_Available; 495 } 496 497 AvailabilityResult Decl::getAvailability(std::string *Message) const { 498 if (auto *FTD = dyn_cast<FunctionTemplateDecl>(this)) 499 return FTD->getTemplatedDecl()->getAvailability(Message); 500 501 AvailabilityResult Result = AR_Available; 502 std::string ResultMessage; 503 504 for (const auto *A : attrs()) { 505 if (const auto *Deprecated = dyn_cast<DeprecatedAttr>(A)) { 506 if (Result >= AR_Deprecated) 507 continue; 508 509 if (Message) 510 ResultMessage = Deprecated->getMessage(); 511 512 Result = AR_Deprecated; 513 continue; 514 } 515 516 if (const auto *Unavailable = dyn_cast<UnavailableAttr>(A)) { 517 if (Message) 518 *Message = Unavailable->getMessage(); 519 return AR_Unavailable; 520 } 521 522 if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) { 523 AvailabilityResult AR = CheckAvailability(getASTContext(), Availability, 524 Message); 525 526 if (AR == AR_Unavailable) 527 return AR_Unavailable; 528 529 if (AR > Result) { 530 Result = AR; 531 if (Message) 532 ResultMessage.swap(*Message); 533 } 534 continue; 535 } 536 } 537 538 if (Message) 539 Message->swap(ResultMessage); 540 return Result; 541 } 542 543 bool Decl::canBeWeakImported(bool &IsDefinition) const { 544 IsDefinition = false; 545 546 // Variables, if they aren't definitions. 547 if (const VarDecl *Var = dyn_cast<VarDecl>(this)) { 548 if (Var->isThisDeclarationADefinition()) { 549 IsDefinition = true; 550 return false; 551 } 552 return true; 553 554 // Functions, if they aren't definitions. 555 } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(this)) { 556 if (FD->hasBody()) { 557 IsDefinition = true; 558 return false; 559 } 560 return true; 561 562 // Objective-C classes, if this is the non-fragile runtime. 563 } else if (isa<ObjCInterfaceDecl>(this) && 564 getASTContext().getLangOpts().ObjCRuntime.hasWeakClassImport()) { 565 return true; 566 567 // Nothing else. 568 } else { 569 return false; 570 } 571 } 572 573 bool Decl::isWeakImported() const { 574 bool IsDefinition; 575 if (!canBeWeakImported(IsDefinition)) 576 return false; 577 578 for (const auto *A : attrs()) { 579 if (isa<WeakImportAttr>(A)) 580 return true; 581 582 if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) { 583 if (CheckAvailability(getASTContext(), Availability, 584 nullptr) == AR_NotYetIntroduced) 585 return true; 586 } 587 } 588 589 return false; 590 } 591 592 unsigned Decl::getIdentifierNamespaceForKind(Kind DeclKind) { 593 switch (DeclKind) { 594 case Function: 595 case CXXMethod: 596 case CXXConstructor: 597 case ConstructorUsingShadow: 598 case CXXDestructor: 599 case CXXConversion: 600 case EnumConstant: 601 case Var: 602 case ImplicitParam: 603 case ParmVar: 604 case ObjCMethod: 605 case ObjCProperty: 606 case MSProperty: 607 return IDNS_Ordinary; 608 case Label: 609 return IDNS_Label; 610 case IndirectField: 611 return IDNS_Ordinary | IDNS_Member; 612 613 case NonTypeTemplateParm: 614 // Non-type template parameters are not found by lookups that ignore 615 // non-types, but they are found by redeclaration lookups for tag types, 616 // so we include them in the tag namespace. 617 return IDNS_Ordinary | IDNS_Tag; 618 619 case ObjCCompatibleAlias: 620 case ObjCInterface: 621 return IDNS_Ordinary | IDNS_Type; 622 623 case Typedef: 624 case TypeAlias: 625 case TypeAliasTemplate: 626 case UnresolvedUsingTypename: 627 case TemplateTypeParm: 628 case ObjCTypeParam: 629 return IDNS_Ordinary | IDNS_Type; 630 631 case UsingShadow: 632 return 0; // we'll actually overwrite this later 633 634 case UnresolvedUsingValue: 635 return IDNS_Ordinary | IDNS_Using; 636 637 case Using: 638 return IDNS_Using; 639 640 case ObjCProtocol: 641 return IDNS_ObjCProtocol; 642 643 case Field: 644 case ObjCAtDefsField: 645 case ObjCIvar: 646 return IDNS_Member; 647 648 case Record: 649 case CXXRecord: 650 case Enum: 651 return IDNS_Tag | IDNS_Type; 652 653 case Namespace: 654 case NamespaceAlias: 655 return IDNS_Namespace; 656 657 case FunctionTemplate: 658 case VarTemplate: 659 return IDNS_Ordinary; 660 661 case ClassTemplate: 662 case TemplateTemplateParm: 663 return IDNS_Ordinary | IDNS_Tag | IDNS_Type; 664 665 case OMPDeclareReduction: 666 return IDNS_OMPReduction; 667 668 // Never have names. 669 case Friend: 670 case FriendTemplate: 671 case AccessSpec: 672 case LinkageSpec: 673 case FileScopeAsm: 674 case StaticAssert: 675 case ObjCPropertyImpl: 676 case PragmaComment: 677 case PragmaDetectMismatch: 678 case Block: 679 case Captured: 680 case TranslationUnit: 681 case ExternCContext: 682 683 case UsingDirective: 684 case BuiltinTemplate: 685 case ClassTemplateSpecialization: 686 case ClassTemplatePartialSpecialization: 687 case ClassScopeFunctionSpecialization: 688 case VarTemplateSpecialization: 689 case VarTemplatePartialSpecialization: 690 case ObjCImplementation: 691 case ObjCCategory: 692 case ObjCCategoryImpl: 693 case Import: 694 case OMPThreadPrivate: 695 case OMPCapturedExpr: 696 case Empty: 697 // Never looked up by name. 698 return 0; 699 } 700 701 llvm_unreachable("Invalid DeclKind!"); 702 } 703 704 void Decl::setAttrsImpl(const AttrVec &attrs, ASTContext &Ctx) { 705 assert(!HasAttrs && "Decl already contains attrs."); 706 707 AttrVec &AttrBlank = Ctx.getDeclAttrs(this); 708 assert(AttrBlank.empty() && "HasAttrs was wrong?"); 709 710 AttrBlank = attrs; 711 HasAttrs = true; 712 } 713 714 void Decl::dropAttrs() { 715 if (!HasAttrs) return; 716 717 HasAttrs = false; 718 getASTContext().eraseDeclAttrs(this); 719 } 720 721 const AttrVec &Decl::getAttrs() const { 722 assert(HasAttrs && "No attrs to get!"); 723 return getASTContext().getDeclAttrs(this); 724 } 725 726 Decl *Decl::castFromDeclContext (const DeclContext *D) { 727 Decl::Kind DK = D->getDeclKind(); 728 switch(DK) { 729 #define DECL(NAME, BASE) 730 #define DECL_CONTEXT(NAME) \ 731 case Decl::NAME: \ 732 return static_cast<NAME##Decl*>(const_cast<DeclContext*>(D)); 733 #define DECL_CONTEXT_BASE(NAME) 734 #include "clang/AST/DeclNodes.inc" 735 default: 736 #define DECL(NAME, BASE) 737 #define DECL_CONTEXT_BASE(NAME) \ 738 if (DK >= first##NAME && DK <= last##NAME) \ 739 return static_cast<NAME##Decl*>(const_cast<DeclContext*>(D)); 740 #include "clang/AST/DeclNodes.inc" 741 llvm_unreachable("a decl that inherits DeclContext isn't handled"); 742 } 743 } 744 745 DeclContext *Decl::castToDeclContext(const Decl *D) { 746 Decl::Kind DK = D->getKind(); 747 switch(DK) { 748 #define DECL(NAME, BASE) 749 #define DECL_CONTEXT(NAME) \ 750 case Decl::NAME: \ 751 return static_cast<NAME##Decl*>(const_cast<Decl*>(D)); 752 #define DECL_CONTEXT_BASE(NAME) 753 #include "clang/AST/DeclNodes.inc" 754 default: 755 #define DECL(NAME, BASE) 756 #define DECL_CONTEXT_BASE(NAME) \ 757 if (DK >= first##NAME && DK <= last##NAME) \ 758 return static_cast<NAME##Decl*>(const_cast<Decl*>(D)); 759 #include "clang/AST/DeclNodes.inc" 760 llvm_unreachable("a decl that inherits DeclContext isn't handled"); 761 } 762 } 763 764 SourceLocation Decl::getBodyRBrace() const { 765 // Special handling of FunctionDecl to avoid de-serializing the body from PCH. 766 // FunctionDecl stores EndRangeLoc for this purpose. 767 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(this)) { 768 const FunctionDecl *Definition; 769 if (FD->hasBody(Definition)) 770 return Definition->getSourceRange().getEnd(); 771 return SourceLocation(); 772 } 773 774 if (Stmt *Body = getBody()) 775 return Body->getSourceRange().getEnd(); 776 777 return SourceLocation(); 778 } 779 780 bool Decl::AccessDeclContextSanity() const { 781 #ifndef NDEBUG 782 // Suppress this check if any of the following hold: 783 // 1. this is the translation unit (and thus has no parent) 784 // 2. this is a template parameter (and thus doesn't belong to its context) 785 // 3. this is a non-type template parameter 786 // 4. the context is not a record 787 // 5. it's invalid 788 // 6. it's a C++0x static_assert. 789 if (isa<TranslationUnitDecl>(this) || 790 isa<TemplateTypeParmDecl>(this) || 791 isa<NonTypeTemplateParmDecl>(this) || 792 !isa<CXXRecordDecl>(getDeclContext()) || 793 isInvalidDecl() || 794 isa<StaticAssertDecl>(this) || 795 // FIXME: a ParmVarDecl can have ClassTemplateSpecialization 796 // as DeclContext (?). 797 isa<ParmVarDecl>(this) || 798 // FIXME: a ClassTemplateSpecialization or CXXRecordDecl can have 799 // AS_none as access specifier. 800 isa<CXXRecordDecl>(this) || 801 isa<ClassScopeFunctionSpecializationDecl>(this)) 802 return true; 803 804 assert(Access != AS_none && 805 "Access specifier is AS_none inside a record decl"); 806 #endif 807 return true; 808 } 809 810 static Decl::Kind getKind(const Decl *D) { return D->getKind(); } 811 static Decl::Kind getKind(const DeclContext *DC) { return DC->getDeclKind(); } 812 813 const FunctionType *Decl::getFunctionType(bool BlocksToo) const { 814 QualType Ty; 815 if (const ValueDecl *D = dyn_cast<ValueDecl>(this)) 816 Ty = D->getType(); 817 else if (const TypedefNameDecl *D = dyn_cast<TypedefNameDecl>(this)) 818 Ty = D->getUnderlyingType(); 819 else 820 return nullptr; 821 822 if (Ty->isFunctionPointerType()) 823 Ty = Ty->getAs<PointerType>()->getPointeeType(); 824 else if (BlocksToo && Ty->isBlockPointerType()) 825 Ty = Ty->getAs<BlockPointerType>()->getPointeeType(); 826 827 return Ty->getAs<FunctionType>(); 828 } 829 830 831 /// Starting at a given context (a Decl or DeclContext), look for a 832 /// code context that is not a closure (a lambda, block, etc.). 833 template <class T> static Decl *getNonClosureContext(T *D) { 834 if (getKind(D) == Decl::CXXMethod) { 835 CXXMethodDecl *MD = cast<CXXMethodDecl>(D); 836 if (MD->getOverloadedOperator() == OO_Call && 837 MD->getParent()->isLambda()) 838 return getNonClosureContext(MD->getParent()->getParent()); 839 return MD; 840 } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 841 return FD; 842 } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) { 843 return MD; 844 } else if (BlockDecl *BD = dyn_cast<BlockDecl>(D)) { 845 return getNonClosureContext(BD->getParent()); 846 } else if (CapturedDecl *CD = dyn_cast<CapturedDecl>(D)) { 847 return getNonClosureContext(CD->getParent()); 848 } else { 849 return nullptr; 850 } 851 } 852 853 Decl *Decl::getNonClosureContext() { 854 return ::getNonClosureContext(this); 855 } 856 857 Decl *DeclContext::getNonClosureAncestor() { 858 return ::getNonClosureContext(this); 859 } 860 861 //===----------------------------------------------------------------------===// 862 // DeclContext Implementation 863 //===----------------------------------------------------------------------===// 864 865 bool DeclContext::classof(const Decl *D) { 866 switch (D->getKind()) { 867 #define DECL(NAME, BASE) 868 #define DECL_CONTEXT(NAME) case Decl::NAME: 869 #define DECL_CONTEXT_BASE(NAME) 870 #include "clang/AST/DeclNodes.inc" 871 return true; 872 default: 873 #define DECL(NAME, BASE) 874 #define DECL_CONTEXT_BASE(NAME) \ 875 if (D->getKind() >= Decl::first##NAME && \ 876 D->getKind() <= Decl::last##NAME) \ 877 return true; 878 #include "clang/AST/DeclNodes.inc" 879 return false; 880 } 881 } 882 883 DeclContext::~DeclContext() { } 884 885 /// \brief Find the parent context of this context that will be 886 /// used for unqualified name lookup. 887 /// 888 /// Generally, the parent lookup context is the semantic context. However, for 889 /// a friend function the parent lookup context is the lexical context, which 890 /// is the class in which the friend is declared. 891 DeclContext *DeclContext::getLookupParent() { 892 // FIXME: Find a better way to identify friends 893 if (isa<FunctionDecl>(this)) 894 if (getParent()->getRedeclContext()->isFileContext() && 895 getLexicalParent()->getRedeclContext()->isRecord()) 896 return getLexicalParent(); 897 898 return getParent(); 899 } 900 901 bool DeclContext::isInlineNamespace() const { 902 return isNamespace() && 903 cast<NamespaceDecl>(this)->isInline(); 904 } 905 906 bool DeclContext::isStdNamespace() const { 907 if (!isNamespace()) 908 return false; 909 910 const NamespaceDecl *ND = cast<NamespaceDecl>(this); 911 if (ND->isInline()) { 912 return ND->getParent()->isStdNamespace(); 913 } 914 915 if (!getParent()->getRedeclContext()->isTranslationUnit()) 916 return false; 917 918 const IdentifierInfo *II = ND->getIdentifier(); 919 return II && II->isStr("std"); 920 } 921 922 bool DeclContext::isDependentContext() const { 923 if (isFileContext()) 924 return false; 925 926 if (isa<ClassTemplatePartialSpecializationDecl>(this)) 927 return true; 928 929 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(this)) { 930 if (Record->getDescribedClassTemplate()) 931 return true; 932 933 if (Record->isDependentLambda()) 934 return true; 935 } 936 937 if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(this)) { 938 if (Function->getDescribedFunctionTemplate()) 939 return true; 940 941 // Friend function declarations are dependent if their *lexical* 942 // context is dependent. 943 if (cast<Decl>(this)->getFriendObjectKind()) 944 return getLexicalParent()->isDependentContext(); 945 } 946 947 // FIXME: A variable template is a dependent context, but is not a 948 // DeclContext. A context within it (such as a lambda-expression) 949 // should be considered dependent. 950 951 return getParent() && getParent()->isDependentContext(); 952 } 953 954 bool DeclContext::isTransparentContext() const { 955 if (DeclKind == Decl::Enum) 956 return !cast<EnumDecl>(this)->isScoped(); 957 else if (DeclKind == Decl::LinkageSpec) 958 return true; 959 960 return false; 961 } 962 963 static bool isLinkageSpecContext(const DeclContext *DC, 964 LinkageSpecDecl::LanguageIDs ID) { 965 while (DC->getDeclKind() != Decl::TranslationUnit) { 966 if (DC->getDeclKind() == Decl::LinkageSpec) 967 return cast<LinkageSpecDecl>(DC)->getLanguage() == ID; 968 DC = DC->getLexicalParent(); 969 } 970 return false; 971 } 972 973 bool DeclContext::isExternCContext() const { 974 return isLinkageSpecContext(this, clang::LinkageSpecDecl::lang_c); 975 } 976 977 bool DeclContext::isExternCXXContext() const { 978 return isLinkageSpecContext(this, clang::LinkageSpecDecl::lang_cxx); 979 } 980 981 bool DeclContext::Encloses(const DeclContext *DC) const { 982 if (getPrimaryContext() != this) 983 return getPrimaryContext()->Encloses(DC); 984 985 for (; DC; DC = DC->getParent()) 986 if (DC->getPrimaryContext() == this) 987 return true; 988 return false; 989 } 990 991 DeclContext *DeclContext::getPrimaryContext() { 992 switch (DeclKind) { 993 case Decl::TranslationUnit: 994 case Decl::ExternCContext: 995 case Decl::LinkageSpec: 996 case Decl::Block: 997 case Decl::Captured: 998 case Decl::OMPDeclareReduction: 999 // There is only one DeclContext for these entities. 1000 return this; 1001 1002 case Decl::Namespace: 1003 // The original namespace is our primary context. 1004 return static_cast<NamespaceDecl*>(this)->getOriginalNamespace(); 1005 1006 case Decl::ObjCMethod: 1007 return this; 1008 1009 case Decl::ObjCInterface: 1010 if (ObjCInterfaceDecl *Def = cast<ObjCInterfaceDecl>(this)->getDefinition()) 1011 return Def; 1012 1013 return this; 1014 1015 case Decl::ObjCProtocol: 1016 if (ObjCProtocolDecl *Def = cast<ObjCProtocolDecl>(this)->getDefinition()) 1017 return Def; 1018 1019 return this; 1020 1021 case Decl::ObjCCategory: 1022 return this; 1023 1024 case Decl::ObjCImplementation: 1025 case Decl::ObjCCategoryImpl: 1026 return this; 1027 1028 default: 1029 if (DeclKind >= Decl::firstTag && DeclKind <= Decl::lastTag) { 1030 // If this is a tag type that has a definition or is currently 1031 // being defined, that definition is our primary context. 1032 TagDecl *Tag = cast<TagDecl>(this); 1033 1034 if (TagDecl *Def = Tag->getDefinition()) 1035 return Def; 1036 1037 if (const TagType *TagTy = dyn_cast<TagType>(Tag->getTypeForDecl())) { 1038 // Note, TagType::getDecl returns the (partial) definition one exists. 1039 TagDecl *PossiblePartialDef = TagTy->getDecl(); 1040 if (PossiblePartialDef->isBeingDefined()) 1041 return PossiblePartialDef; 1042 } else { 1043 assert(isa<InjectedClassNameType>(Tag->getTypeForDecl())); 1044 } 1045 1046 return Tag; 1047 } 1048 1049 assert(DeclKind >= Decl::firstFunction && DeclKind <= Decl::lastFunction && 1050 "Unknown DeclContext kind"); 1051 return this; 1052 } 1053 } 1054 1055 void 1056 DeclContext::collectAllContexts(SmallVectorImpl<DeclContext *> &Contexts){ 1057 Contexts.clear(); 1058 1059 if (DeclKind != Decl::Namespace) { 1060 Contexts.push_back(this); 1061 return; 1062 } 1063 1064 NamespaceDecl *Self = static_cast<NamespaceDecl *>(this); 1065 for (NamespaceDecl *N = Self->getMostRecentDecl(); N; 1066 N = N->getPreviousDecl()) 1067 Contexts.push_back(N); 1068 1069 std::reverse(Contexts.begin(), Contexts.end()); 1070 } 1071 1072 std::pair<Decl *, Decl *> 1073 DeclContext::BuildDeclChain(ArrayRef<Decl*> Decls, 1074 bool FieldsAlreadyLoaded) { 1075 // Build up a chain of declarations via the Decl::NextInContextAndBits field. 1076 Decl *FirstNewDecl = nullptr; 1077 Decl *PrevDecl = nullptr; 1078 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 1079 if (FieldsAlreadyLoaded && isa<FieldDecl>(Decls[I])) 1080 continue; 1081 1082 Decl *D = Decls[I]; 1083 if (PrevDecl) 1084 PrevDecl->NextInContextAndBits.setPointer(D); 1085 else 1086 FirstNewDecl = D; 1087 1088 PrevDecl = D; 1089 } 1090 1091 return std::make_pair(FirstNewDecl, PrevDecl); 1092 } 1093 1094 /// \brief We have just acquired external visible storage, and we already have 1095 /// built a lookup map. For every name in the map, pull in the new names from 1096 /// the external storage. 1097 void DeclContext::reconcileExternalVisibleStorage() const { 1098 assert(NeedToReconcileExternalVisibleStorage && LookupPtr); 1099 NeedToReconcileExternalVisibleStorage = false; 1100 1101 for (auto &Lookup : *LookupPtr) 1102 Lookup.second.setHasExternalDecls(); 1103 } 1104 1105 /// \brief Load the declarations within this lexical storage from an 1106 /// external source. 1107 /// \return \c true if any declarations were added. 1108 bool 1109 DeclContext::LoadLexicalDeclsFromExternalStorage() const { 1110 ExternalASTSource *Source = getParentASTContext().getExternalSource(); 1111 assert(hasExternalLexicalStorage() && Source && "No external storage?"); 1112 1113 // Notify that we have a DeclContext that is initializing. 1114 ExternalASTSource::Deserializing ADeclContext(Source); 1115 1116 // Load the external declarations, if any. 1117 SmallVector<Decl*, 64> Decls; 1118 ExternalLexicalStorage = false; 1119 Source->FindExternalLexicalDecls(this, Decls); 1120 1121 if (Decls.empty()) 1122 return false; 1123 1124 // We may have already loaded just the fields of this record, in which case 1125 // we need to ignore them. 1126 bool FieldsAlreadyLoaded = false; 1127 if (const RecordDecl *RD = dyn_cast<RecordDecl>(this)) 1128 FieldsAlreadyLoaded = RD->LoadedFieldsFromExternalStorage; 1129 1130 // Splice the newly-read declarations into the beginning of the list 1131 // of declarations. 1132 Decl *ExternalFirst, *ExternalLast; 1133 std::tie(ExternalFirst, ExternalLast) = 1134 BuildDeclChain(Decls, FieldsAlreadyLoaded); 1135 ExternalLast->NextInContextAndBits.setPointer(FirstDecl); 1136 FirstDecl = ExternalFirst; 1137 if (!LastDecl) 1138 LastDecl = ExternalLast; 1139 return true; 1140 } 1141 1142 DeclContext::lookup_result 1143 ExternalASTSource::SetNoExternalVisibleDeclsForName(const DeclContext *DC, 1144 DeclarationName Name) { 1145 ASTContext &Context = DC->getParentASTContext(); 1146 StoredDeclsMap *Map; 1147 if (!(Map = DC->LookupPtr)) 1148 Map = DC->CreateStoredDeclsMap(Context); 1149 if (DC->NeedToReconcileExternalVisibleStorage) 1150 DC->reconcileExternalVisibleStorage(); 1151 1152 (*Map)[Name].removeExternalDecls(); 1153 1154 return DeclContext::lookup_result(); 1155 } 1156 1157 DeclContext::lookup_result 1158 ExternalASTSource::SetExternalVisibleDeclsForName(const DeclContext *DC, 1159 DeclarationName Name, 1160 ArrayRef<NamedDecl*> Decls) { 1161 ASTContext &Context = DC->getParentASTContext(); 1162 StoredDeclsMap *Map; 1163 if (!(Map = DC->LookupPtr)) 1164 Map = DC->CreateStoredDeclsMap(Context); 1165 if (DC->NeedToReconcileExternalVisibleStorage) 1166 DC->reconcileExternalVisibleStorage(); 1167 1168 StoredDeclsList &List = (*Map)[Name]; 1169 1170 // Clear out any old external visible declarations, to avoid quadratic 1171 // performance in the redeclaration checks below. 1172 List.removeExternalDecls(); 1173 1174 if (!List.isNull()) { 1175 // We have both existing declarations and new declarations for this name. 1176 // Some of the declarations may simply replace existing ones. Handle those 1177 // first. 1178 llvm::SmallVector<unsigned, 8> Skip; 1179 for (unsigned I = 0, N = Decls.size(); I != N; ++I) 1180 if (List.HandleRedeclaration(Decls[I], /*IsKnownNewer*/false)) 1181 Skip.push_back(I); 1182 Skip.push_back(Decls.size()); 1183 1184 // Add in any new declarations. 1185 unsigned SkipPos = 0; 1186 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 1187 if (I == Skip[SkipPos]) 1188 ++SkipPos; 1189 else 1190 List.AddSubsequentDecl(Decls[I]); 1191 } 1192 } else { 1193 // Convert the array to a StoredDeclsList. 1194 for (ArrayRef<NamedDecl*>::iterator 1195 I = Decls.begin(), E = Decls.end(); I != E; ++I) { 1196 if (List.isNull()) 1197 List.setOnlyValue(*I); 1198 else 1199 List.AddSubsequentDecl(*I); 1200 } 1201 } 1202 1203 return List.getLookupResult(); 1204 } 1205 1206 DeclContext::decl_iterator DeclContext::decls_begin() const { 1207 if (hasExternalLexicalStorage()) 1208 LoadLexicalDeclsFromExternalStorage(); 1209 return decl_iterator(FirstDecl); 1210 } 1211 1212 bool DeclContext::decls_empty() const { 1213 if (hasExternalLexicalStorage()) 1214 LoadLexicalDeclsFromExternalStorage(); 1215 1216 return !FirstDecl; 1217 } 1218 1219 bool DeclContext::containsDecl(Decl *D) const { 1220 return (D->getLexicalDeclContext() == this && 1221 (D->NextInContextAndBits.getPointer() || D == LastDecl)); 1222 } 1223 1224 void DeclContext::removeDecl(Decl *D) { 1225 assert(D->getLexicalDeclContext() == this && 1226 "decl being removed from non-lexical context"); 1227 assert((D->NextInContextAndBits.getPointer() || D == LastDecl) && 1228 "decl is not in decls list"); 1229 1230 // Remove D from the decl chain. This is O(n) but hopefully rare. 1231 if (D == FirstDecl) { 1232 if (D == LastDecl) 1233 FirstDecl = LastDecl = nullptr; 1234 else 1235 FirstDecl = D->NextInContextAndBits.getPointer(); 1236 } else { 1237 for (Decl *I = FirstDecl; true; I = I->NextInContextAndBits.getPointer()) { 1238 assert(I && "decl not found in linked list"); 1239 if (I->NextInContextAndBits.getPointer() == D) { 1240 I->NextInContextAndBits.setPointer(D->NextInContextAndBits.getPointer()); 1241 if (D == LastDecl) LastDecl = I; 1242 break; 1243 } 1244 } 1245 } 1246 1247 // Mark that D is no longer in the decl chain. 1248 D->NextInContextAndBits.setPointer(nullptr); 1249 1250 // Remove D from the lookup table if necessary. 1251 if (isa<NamedDecl>(D)) { 1252 NamedDecl *ND = cast<NamedDecl>(D); 1253 1254 // Remove only decls that have a name 1255 if (!ND->getDeclName()) return; 1256 1257 auto *DC = this; 1258 do { 1259 StoredDeclsMap *Map = DC->getPrimaryContext()->LookupPtr; 1260 if (Map) { 1261 StoredDeclsMap::iterator Pos = Map->find(ND->getDeclName()); 1262 assert(Pos != Map->end() && "no lookup entry for decl"); 1263 if (Pos->second.getAsVector() || Pos->second.getAsDecl() == ND) 1264 Pos->second.remove(ND); 1265 } 1266 } while (DC->isTransparentContext() && (DC = DC->getParent())); 1267 } 1268 } 1269 1270 void DeclContext::addHiddenDecl(Decl *D) { 1271 assert(D->getLexicalDeclContext() == this && 1272 "Decl inserted into wrong lexical context"); 1273 assert(!D->getNextDeclInContext() && D != LastDecl && 1274 "Decl already inserted into a DeclContext"); 1275 1276 if (FirstDecl) { 1277 LastDecl->NextInContextAndBits.setPointer(D); 1278 LastDecl = D; 1279 } else { 1280 FirstDecl = LastDecl = D; 1281 } 1282 1283 // Notify a C++ record declaration that we've added a member, so it can 1284 // update its class-specific state. 1285 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(this)) 1286 Record->addedMember(D); 1287 1288 // If this is a newly-created (not de-serialized) import declaration, wire 1289 // it in to the list of local import declarations. 1290 if (!D->isFromASTFile()) { 1291 if (ImportDecl *Import = dyn_cast<ImportDecl>(D)) 1292 D->getASTContext().addedLocalImportDecl(Import); 1293 } 1294 } 1295 1296 void DeclContext::addDecl(Decl *D) { 1297 addHiddenDecl(D); 1298 1299 if (NamedDecl *ND = dyn_cast<NamedDecl>(D)) 1300 ND->getDeclContext()->getPrimaryContext()-> 1301 makeDeclVisibleInContextWithFlags(ND, false, true); 1302 } 1303 1304 void DeclContext::addDeclInternal(Decl *D) { 1305 addHiddenDecl(D); 1306 1307 if (NamedDecl *ND = dyn_cast<NamedDecl>(D)) 1308 ND->getDeclContext()->getPrimaryContext()-> 1309 makeDeclVisibleInContextWithFlags(ND, true, true); 1310 } 1311 1312 /// shouldBeHidden - Determine whether a declaration which was declared 1313 /// within its semantic context should be invisible to qualified name lookup. 1314 static bool shouldBeHidden(NamedDecl *D) { 1315 // Skip unnamed declarations. 1316 if (!D->getDeclName()) 1317 return true; 1318 1319 // Skip entities that can't be found by name lookup into a particular 1320 // context. 1321 if ((D->getIdentifierNamespace() == 0 && !isa<UsingDirectiveDecl>(D)) || 1322 D->isTemplateParameter()) 1323 return true; 1324 1325 // Skip template specializations. 1326 // FIXME: This feels like a hack. Should DeclarationName support 1327 // template-ids, or is there a better way to keep specializations 1328 // from being visible? 1329 if (isa<ClassTemplateSpecializationDecl>(D)) 1330 return true; 1331 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) 1332 if (FD->isFunctionTemplateSpecialization()) 1333 return true; 1334 1335 return false; 1336 } 1337 1338 /// buildLookup - Build the lookup data structure with all of the 1339 /// declarations in this DeclContext (and any other contexts linked 1340 /// to it or transparent contexts nested within it) and return it. 1341 /// 1342 /// Note that the produced map may miss out declarations from an 1343 /// external source. If it does, those entries will be marked with 1344 /// the 'hasExternalDecls' flag. 1345 StoredDeclsMap *DeclContext::buildLookup() { 1346 assert(this == getPrimaryContext() && "buildLookup called on non-primary DC"); 1347 1348 if (!HasLazyLocalLexicalLookups && !HasLazyExternalLexicalLookups) 1349 return LookupPtr; 1350 1351 SmallVector<DeclContext *, 2> Contexts; 1352 collectAllContexts(Contexts); 1353 1354 if (HasLazyExternalLexicalLookups) { 1355 HasLazyExternalLexicalLookups = false; 1356 for (auto *DC : Contexts) { 1357 if (DC->hasExternalLexicalStorage()) 1358 HasLazyLocalLexicalLookups |= 1359 DC->LoadLexicalDeclsFromExternalStorage(); 1360 } 1361 1362 if (!HasLazyLocalLexicalLookups) 1363 return LookupPtr; 1364 } 1365 1366 for (auto *DC : Contexts) 1367 buildLookupImpl(DC, hasExternalVisibleStorage()); 1368 1369 // We no longer have any lazy decls. 1370 HasLazyLocalLexicalLookups = false; 1371 return LookupPtr; 1372 } 1373 1374 /// buildLookupImpl - Build part of the lookup data structure for the 1375 /// declarations contained within DCtx, which will either be this 1376 /// DeclContext, a DeclContext linked to it, or a transparent context 1377 /// nested within it. 1378 void DeclContext::buildLookupImpl(DeclContext *DCtx, bool Internal) { 1379 for (Decl *D : DCtx->noload_decls()) { 1380 // Insert this declaration into the lookup structure, but only if 1381 // it's semantically within its decl context. Any other decls which 1382 // should be found in this context are added eagerly. 1383 // 1384 // If it's from an AST file, don't add it now. It'll get handled by 1385 // FindExternalVisibleDeclsByName if needed. Exception: if we're not 1386 // in C++, we do not track external visible decls for the TU, so in 1387 // that case we need to collect them all here. 1388 if (NamedDecl *ND = dyn_cast<NamedDecl>(D)) 1389 if (ND->getDeclContext() == DCtx && !shouldBeHidden(ND) && 1390 (!ND->isFromASTFile() || 1391 (isTranslationUnit() && 1392 !getParentASTContext().getLangOpts().CPlusPlus))) 1393 makeDeclVisibleInContextImpl(ND, Internal); 1394 1395 // If this declaration is itself a transparent declaration context 1396 // or inline namespace, add the members of this declaration of that 1397 // context (recursively). 1398 if (DeclContext *InnerCtx = dyn_cast<DeclContext>(D)) 1399 if (InnerCtx->isTransparentContext() || InnerCtx->isInlineNamespace()) 1400 buildLookupImpl(InnerCtx, Internal); 1401 } 1402 } 1403 1404 NamedDecl *const DeclContextLookupResult::SingleElementDummyList = nullptr; 1405 1406 DeclContext::lookup_result 1407 DeclContext::lookup(DeclarationName Name) const { 1408 assert(DeclKind != Decl::LinkageSpec && 1409 "Should not perform lookups into linkage specs!"); 1410 1411 const DeclContext *PrimaryContext = getPrimaryContext(); 1412 if (PrimaryContext != this) 1413 return PrimaryContext->lookup(Name); 1414 1415 // If we have an external source, ensure that any later redeclarations of this 1416 // context have been loaded, since they may add names to the result of this 1417 // lookup (or add external visible storage). 1418 ExternalASTSource *Source = getParentASTContext().getExternalSource(); 1419 if (Source) 1420 (void)cast<Decl>(this)->getMostRecentDecl(); 1421 1422 if (hasExternalVisibleStorage()) { 1423 assert(Source && "external visible storage but no external source?"); 1424 1425 if (NeedToReconcileExternalVisibleStorage) 1426 reconcileExternalVisibleStorage(); 1427 1428 StoredDeclsMap *Map = LookupPtr; 1429 1430 if (HasLazyLocalLexicalLookups || HasLazyExternalLexicalLookups) 1431 // FIXME: Make buildLookup const? 1432 Map = const_cast<DeclContext*>(this)->buildLookup(); 1433 1434 if (!Map) 1435 Map = CreateStoredDeclsMap(getParentASTContext()); 1436 1437 // If we have a lookup result with no external decls, we are done. 1438 std::pair<StoredDeclsMap::iterator, bool> R = 1439 Map->insert(std::make_pair(Name, StoredDeclsList())); 1440 if (!R.second && !R.first->second.hasExternalDecls()) 1441 return R.first->second.getLookupResult(); 1442 1443 if (Source->FindExternalVisibleDeclsByName(this, Name) || !R.second) { 1444 if (StoredDeclsMap *Map = LookupPtr) { 1445 StoredDeclsMap::iterator I = Map->find(Name); 1446 if (I != Map->end()) 1447 return I->second.getLookupResult(); 1448 } 1449 } 1450 1451 return lookup_result(); 1452 } 1453 1454 StoredDeclsMap *Map = LookupPtr; 1455 if (HasLazyLocalLexicalLookups || HasLazyExternalLexicalLookups) 1456 Map = const_cast<DeclContext*>(this)->buildLookup(); 1457 1458 if (!Map) 1459 return lookup_result(); 1460 1461 StoredDeclsMap::iterator I = Map->find(Name); 1462 if (I == Map->end()) 1463 return lookup_result(); 1464 1465 return I->second.getLookupResult(); 1466 } 1467 1468 DeclContext::lookup_result 1469 DeclContext::noload_lookup(DeclarationName Name) { 1470 assert(DeclKind != Decl::LinkageSpec && 1471 "Should not perform lookups into linkage specs!"); 1472 1473 DeclContext *PrimaryContext = getPrimaryContext(); 1474 if (PrimaryContext != this) 1475 return PrimaryContext->noload_lookup(Name); 1476 1477 // If we have any lazy lexical declarations not in our lookup map, add them 1478 // now. Don't import any external declarations, not even if we know we have 1479 // some missing from the external visible lookups. 1480 if (HasLazyLocalLexicalLookups) { 1481 SmallVector<DeclContext *, 2> Contexts; 1482 collectAllContexts(Contexts); 1483 for (unsigned I = 0, N = Contexts.size(); I != N; ++I) 1484 buildLookupImpl(Contexts[I], hasExternalVisibleStorage()); 1485 HasLazyLocalLexicalLookups = false; 1486 } 1487 1488 StoredDeclsMap *Map = LookupPtr; 1489 if (!Map) 1490 return lookup_result(); 1491 1492 StoredDeclsMap::iterator I = Map->find(Name); 1493 return I != Map->end() ? I->second.getLookupResult() 1494 : lookup_result(); 1495 } 1496 1497 void DeclContext::localUncachedLookup(DeclarationName Name, 1498 SmallVectorImpl<NamedDecl *> &Results) { 1499 Results.clear(); 1500 1501 // If there's no external storage, just perform a normal lookup and copy 1502 // the results. 1503 if (!hasExternalVisibleStorage() && !hasExternalLexicalStorage() && Name) { 1504 lookup_result LookupResults = lookup(Name); 1505 Results.insert(Results.end(), LookupResults.begin(), LookupResults.end()); 1506 return; 1507 } 1508 1509 // If we have a lookup table, check there first. Maybe we'll get lucky. 1510 // FIXME: Should we be checking these flags on the primary context? 1511 if (Name && !HasLazyLocalLexicalLookups && !HasLazyExternalLexicalLookups) { 1512 if (StoredDeclsMap *Map = LookupPtr) { 1513 StoredDeclsMap::iterator Pos = Map->find(Name); 1514 if (Pos != Map->end()) { 1515 Results.insert(Results.end(), 1516 Pos->second.getLookupResult().begin(), 1517 Pos->second.getLookupResult().end()); 1518 return; 1519 } 1520 } 1521 } 1522 1523 // Slow case: grovel through the declarations in our chain looking for 1524 // matches. 1525 // FIXME: If we have lazy external declarations, this will not find them! 1526 // FIXME: Should we CollectAllContexts and walk them all here? 1527 for (Decl *D = FirstDecl; D; D = D->getNextDeclInContext()) { 1528 if (NamedDecl *ND = dyn_cast<NamedDecl>(D)) 1529 if (ND->getDeclName() == Name) 1530 Results.push_back(ND); 1531 } 1532 } 1533 1534 DeclContext *DeclContext::getRedeclContext() { 1535 DeclContext *Ctx = this; 1536 // Skip through transparent contexts. 1537 while (Ctx->isTransparentContext()) 1538 Ctx = Ctx->getParent(); 1539 return Ctx; 1540 } 1541 1542 DeclContext *DeclContext::getEnclosingNamespaceContext() { 1543 DeclContext *Ctx = this; 1544 // Skip through non-namespace, non-translation-unit contexts. 1545 while (!Ctx->isFileContext()) 1546 Ctx = Ctx->getParent(); 1547 return Ctx->getPrimaryContext(); 1548 } 1549 1550 RecordDecl *DeclContext::getOuterLexicalRecordContext() { 1551 // Loop until we find a non-record context. 1552 RecordDecl *OutermostRD = nullptr; 1553 DeclContext *DC = this; 1554 while (DC->isRecord()) { 1555 OutermostRD = cast<RecordDecl>(DC); 1556 DC = DC->getLexicalParent(); 1557 } 1558 return OutermostRD; 1559 } 1560 1561 bool DeclContext::InEnclosingNamespaceSetOf(const DeclContext *O) const { 1562 // For non-file contexts, this is equivalent to Equals. 1563 if (!isFileContext()) 1564 return O->Equals(this); 1565 1566 do { 1567 if (O->Equals(this)) 1568 return true; 1569 1570 const NamespaceDecl *NS = dyn_cast<NamespaceDecl>(O); 1571 if (!NS || !NS->isInline()) 1572 break; 1573 O = NS->getParent(); 1574 } while (O); 1575 1576 return false; 1577 } 1578 1579 void DeclContext::makeDeclVisibleInContext(NamedDecl *D) { 1580 DeclContext *PrimaryDC = this->getPrimaryContext(); 1581 DeclContext *DeclDC = D->getDeclContext()->getPrimaryContext(); 1582 // If the decl is being added outside of its semantic decl context, we 1583 // need to ensure that we eagerly build the lookup information for it. 1584 PrimaryDC->makeDeclVisibleInContextWithFlags(D, false, PrimaryDC == DeclDC); 1585 } 1586 1587 void DeclContext::makeDeclVisibleInContextWithFlags(NamedDecl *D, bool Internal, 1588 bool Recoverable) { 1589 assert(this == getPrimaryContext() && "expected a primary DC"); 1590 1591 if (!isLookupContext()) { 1592 if (isTransparentContext()) 1593 getParent()->getPrimaryContext() 1594 ->makeDeclVisibleInContextWithFlags(D, Internal, Recoverable); 1595 return; 1596 } 1597 1598 // Skip declarations which should be invisible to name lookup. 1599 if (shouldBeHidden(D)) 1600 return; 1601 1602 // If we already have a lookup data structure, perform the insertion into 1603 // it. If we might have externally-stored decls with this name, look them 1604 // up and perform the insertion. If this decl was declared outside its 1605 // semantic context, buildLookup won't add it, so add it now. 1606 // 1607 // FIXME: As a performance hack, don't add such decls into the translation 1608 // unit unless we're in C++, since qualified lookup into the TU is never 1609 // performed. 1610 if (LookupPtr || hasExternalVisibleStorage() || 1611 ((!Recoverable || D->getDeclContext() != D->getLexicalDeclContext()) && 1612 (getParentASTContext().getLangOpts().CPlusPlus || 1613 !isTranslationUnit()))) { 1614 // If we have lazily omitted any decls, they might have the same name as 1615 // the decl which we are adding, so build a full lookup table before adding 1616 // this decl. 1617 buildLookup(); 1618 makeDeclVisibleInContextImpl(D, Internal); 1619 } else { 1620 HasLazyLocalLexicalLookups = true; 1621 } 1622 1623 // If we are a transparent context or inline namespace, insert into our 1624 // parent context, too. This operation is recursive. 1625 if (isTransparentContext() || isInlineNamespace()) 1626 getParent()->getPrimaryContext()-> 1627 makeDeclVisibleInContextWithFlags(D, Internal, Recoverable); 1628 1629 Decl *DCAsDecl = cast<Decl>(this); 1630 // Notify that a decl was made visible unless we are a Tag being defined. 1631 if (!(isa<TagDecl>(DCAsDecl) && cast<TagDecl>(DCAsDecl)->isBeingDefined())) 1632 if (ASTMutationListener *L = DCAsDecl->getASTMutationListener()) 1633 L->AddedVisibleDecl(this, D); 1634 } 1635 1636 void DeclContext::makeDeclVisibleInContextImpl(NamedDecl *D, bool Internal) { 1637 // Find or create the stored declaration map. 1638 StoredDeclsMap *Map = LookupPtr; 1639 if (!Map) { 1640 ASTContext *C = &getParentASTContext(); 1641 Map = CreateStoredDeclsMap(*C); 1642 } 1643 1644 // If there is an external AST source, load any declarations it knows about 1645 // with this declaration's name. 1646 // If the lookup table contains an entry about this name it means that we 1647 // have already checked the external source. 1648 if (!Internal) 1649 if (ExternalASTSource *Source = getParentASTContext().getExternalSource()) 1650 if (hasExternalVisibleStorage() && 1651 Map->find(D->getDeclName()) == Map->end()) 1652 Source->FindExternalVisibleDeclsByName(this, D->getDeclName()); 1653 1654 // Insert this declaration into the map. 1655 StoredDeclsList &DeclNameEntries = (*Map)[D->getDeclName()]; 1656 1657 if (Internal) { 1658 // If this is being added as part of loading an external declaration, 1659 // this may not be the only external declaration with this name. 1660 // In this case, we never try to replace an existing declaration; we'll 1661 // handle that when we finalize the list of declarations for this name. 1662 DeclNameEntries.setHasExternalDecls(); 1663 DeclNameEntries.AddSubsequentDecl(D); 1664 return; 1665 } 1666 1667 if (DeclNameEntries.isNull()) { 1668 DeclNameEntries.setOnlyValue(D); 1669 return; 1670 } 1671 1672 if (DeclNameEntries.HandleRedeclaration(D, /*IsKnownNewer*/!Internal)) { 1673 // This declaration has replaced an existing one for which 1674 // declarationReplaces returns true. 1675 return; 1676 } 1677 1678 // Put this declaration into the appropriate slot. 1679 DeclNameEntries.AddSubsequentDecl(D); 1680 } 1681 1682 UsingDirectiveDecl *DeclContext::udir_iterator::operator*() const { 1683 return cast<UsingDirectiveDecl>(*I); 1684 } 1685 1686 /// Returns iterator range [First, Last) of UsingDirectiveDecls stored within 1687 /// this context. 1688 DeclContext::udir_range DeclContext::using_directives() const { 1689 // FIXME: Use something more efficient than normal lookup for using 1690 // directives. In C++, using directives are looked up more than anything else. 1691 lookup_result Result = lookup(UsingDirectiveDecl::getName()); 1692 return udir_range(Result.begin(), Result.end()); 1693 } 1694 1695 //===----------------------------------------------------------------------===// 1696 // Creation and Destruction of StoredDeclsMaps. // 1697 //===----------------------------------------------------------------------===// 1698 1699 StoredDeclsMap *DeclContext::CreateStoredDeclsMap(ASTContext &C) const { 1700 assert(!LookupPtr && "context already has a decls map"); 1701 assert(getPrimaryContext() == this && 1702 "creating decls map on non-primary context"); 1703 1704 StoredDeclsMap *M; 1705 bool Dependent = isDependentContext(); 1706 if (Dependent) 1707 M = new DependentStoredDeclsMap(); 1708 else 1709 M = new StoredDeclsMap(); 1710 M->Previous = C.LastSDM; 1711 C.LastSDM = llvm::PointerIntPair<StoredDeclsMap*,1>(M, Dependent); 1712 LookupPtr = M; 1713 return M; 1714 } 1715 1716 void ASTContext::ReleaseDeclContextMaps() { 1717 // It's okay to delete DependentStoredDeclsMaps via a StoredDeclsMap 1718 // pointer because the subclass doesn't add anything that needs to 1719 // be deleted. 1720 StoredDeclsMap::DestroyAll(LastSDM.getPointer(), LastSDM.getInt()); 1721 } 1722 1723 void StoredDeclsMap::DestroyAll(StoredDeclsMap *Map, bool Dependent) { 1724 while (Map) { 1725 // Advance the iteration before we invalidate memory. 1726 llvm::PointerIntPair<StoredDeclsMap*,1> Next = Map->Previous; 1727 1728 if (Dependent) 1729 delete static_cast<DependentStoredDeclsMap*>(Map); 1730 else 1731 delete Map; 1732 1733 Map = Next.getPointer(); 1734 Dependent = Next.getInt(); 1735 } 1736 } 1737 1738 DependentDiagnostic *DependentDiagnostic::Create(ASTContext &C, 1739 DeclContext *Parent, 1740 const PartialDiagnostic &PDiag) { 1741 assert(Parent->isDependentContext() 1742 && "cannot iterate dependent diagnostics of non-dependent context"); 1743 Parent = Parent->getPrimaryContext(); 1744 if (!Parent->LookupPtr) 1745 Parent->CreateStoredDeclsMap(C); 1746 1747 DependentStoredDeclsMap *Map = 1748 static_cast<DependentStoredDeclsMap *>(Parent->LookupPtr); 1749 1750 // Allocate the copy of the PartialDiagnostic via the ASTContext's 1751 // BumpPtrAllocator, rather than the ASTContext itself. 1752 PartialDiagnostic::Storage *DiagStorage = nullptr; 1753 if (PDiag.hasStorage()) 1754 DiagStorage = new (C) PartialDiagnostic::Storage; 1755 1756 DependentDiagnostic *DD = new (C) DependentDiagnostic(PDiag, DiagStorage); 1757 1758 // TODO: Maybe we shouldn't reverse the order during insertion. 1759 DD->NextDiagnostic = Map->FirstDiagnostic; 1760 Map->FirstDiagnostic = DD; 1761 1762 return DD; 1763 } 1764