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 if (auto *RD = dyn_cast<CXXRecordDecl>(this)) 234 return RD->getDescribedClassTemplate(); 235 if (auto *VD = dyn_cast<VarDecl>(this)) 236 return VD->getDescribedVarTemplate(); 237 if (auto *AD = dyn_cast<TypeAliasDecl>(this)) 238 return AD->getDescribedAliasTemplate(); 239 240 return nullptr; 241 } 242 243 const TemplateParameterList *Decl::getDescribedTemplateParams() const { 244 if (auto *TD = getDescribedTemplate()) 245 return TD->getTemplateParameters(); 246 if (auto *CTPSD = dyn_cast<ClassTemplatePartialSpecializationDecl>(this)) 247 return CTPSD->getTemplateParameters(); 248 if (auto *VTPSD = dyn_cast<VarTemplatePartialSpecializationDecl>(this)) 249 return VTPSD->getTemplateParameters(); 250 return nullptr; 251 } 252 253 bool Decl::isTemplated() const { 254 // A declaration is templated if it is a template or a template pattern, or 255 // is within (lexcially for a friend, semantically otherwise) a dependent 256 // context. 257 // FIXME: Should local extern declarations be treated like friends? 258 if (auto *AsDC = dyn_cast<DeclContext>(this)) 259 return AsDC->isDependentContext(); 260 auto *DC = getFriendObjectKind() ? getLexicalDeclContext() : getDeclContext(); 261 return DC->isDependentContext() || isTemplateDecl() || 262 getDescribedTemplateParams(); 263 } 264 265 unsigned Decl::getTemplateDepth() const { 266 if (auto *DC = dyn_cast<DeclContext>(this)) 267 if (DC->isFileContext()) 268 return 0; 269 270 if (auto *TPL = getDescribedTemplateParams()) 271 return TPL->getDepth() + 1; 272 273 // If this is a dependent lambda, there might be an enclosing variable 274 // template. In this case, the next step is not the parent DeclContext (or 275 // even a DeclContext at all). 276 auto *RD = dyn_cast<CXXRecordDecl>(this); 277 if (RD && RD->isDependentLambda()) 278 if (Decl *Context = RD->getLambdaContextDecl()) 279 return Context->getTemplateDepth(); 280 281 const DeclContext *DC = 282 getFriendObjectKind() ? getLexicalDeclContext() : getDeclContext(); 283 return cast<Decl>(DC)->getTemplateDepth(); 284 } 285 286 const DeclContext *Decl::getParentFunctionOrMethod(bool LexicalParent) const { 287 for (const DeclContext *DC = LexicalParent ? getLexicalDeclContext() 288 : getDeclContext(); 289 DC && !DC->isTranslationUnit() && !DC->isNamespace(); 290 DC = DC->getParent()) 291 if (DC->isFunctionOrMethod()) 292 return DC; 293 294 return nullptr; 295 } 296 297 //===----------------------------------------------------------------------===// 298 // PrettyStackTraceDecl Implementation 299 //===----------------------------------------------------------------------===// 300 301 void PrettyStackTraceDecl::print(raw_ostream &OS) const { 302 SourceLocation TheLoc = Loc; 303 if (TheLoc.isInvalid() && TheDecl) 304 TheLoc = TheDecl->getLocation(); 305 306 if (TheLoc.isValid()) { 307 TheLoc.print(OS, SM); 308 OS << ": "; 309 } 310 311 OS << Message; 312 313 if (const auto *DN = dyn_cast_or_null<NamedDecl>(TheDecl)) { 314 OS << " '"; 315 DN->printQualifiedName(OS); 316 OS << '\''; 317 } 318 OS << '\n'; 319 } 320 321 //===----------------------------------------------------------------------===// 322 // Decl Implementation 323 //===----------------------------------------------------------------------===// 324 325 // Out-of-line virtual method providing a home for Decl. 326 Decl::~Decl() = default; 327 328 void Decl::setDeclContext(DeclContext *DC) { 329 DeclCtx = DC; 330 } 331 332 void Decl::setLexicalDeclContext(DeclContext *DC) { 333 if (DC == getLexicalDeclContext()) 334 return; 335 336 if (isInSemaDC()) { 337 setDeclContextsImpl(getDeclContext(), DC, getASTContext()); 338 } else { 339 getMultipleDC()->LexicalDC = DC; 340 } 341 342 // FIXME: We shouldn't be changing the lexical context of declarations 343 // imported from AST files. 344 if (!isFromASTFile()) { 345 setModuleOwnershipKind(getModuleOwnershipKindForChildOf(DC)); 346 if (hasOwningModule()) 347 setLocalOwningModule(cast<Decl>(DC)->getOwningModule()); 348 } 349 350 assert( 351 (getModuleOwnershipKind() != ModuleOwnershipKind::VisibleWhenImported || 352 getOwningModule()) && 353 "hidden declaration has no owning module"); 354 } 355 356 void Decl::setDeclContextsImpl(DeclContext *SemaDC, DeclContext *LexicalDC, 357 ASTContext &Ctx) { 358 if (SemaDC == LexicalDC) { 359 DeclCtx = SemaDC; 360 } else { 361 auto *MDC = new (Ctx) Decl::MultipleDC(); 362 MDC->SemanticDC = SemaDC; 363 MDC->LexicalDC = LexicalDC; 364 DeclCtx = MDC; 365 } 366 } 367 368 bool Decl::isInLocalScopeForInstantiation() const { 369 const DeclContext *LDC = getLexicalDeclContext(); 370 if (!LDC->isDependentContext()) 371 return false; 372 while (true) { 373 if (LDC->isFunctionOrMethod()) 374 return true; 375 if (!isa<TagDecl>(LDC)) 376 return false; 377 if (const auto *CRD = dyn_cast<CXXRecordDecl>(LDC)) 378 if (CRD->isLambda()) 379 return true; 380 LDC = LDC->getLexicalParent(); 381 } 382 return false; 383 } 384 385 bool Decl::isInAnonymousNamespace() const { 386 for (const DeclContext *DC = getDeclContext(); DC; DC = DC->getParent()) { 387 if (const auto *ND = dyn_cast<NamespaceDecl>(DC)) 388 if (ND->isAnonymousNamespace()) 389 return true; 390 } 391 392 return false; 393 } 394 395 bool Decl::isInStdNamespace() const { 396 const DeclContext *DC = getDeclContext(); 397 return DC && DC->isStdNamespace(); 398 } 399 400 TranslationUnitDecl *Decl::getTranslationUnitDecl() { 401 if (auto *TUD = dyn_cast<TranslationUnitDecl>(this)) 402 return TUD; 403 404 DeclContext *DC = getDeclContext(); 405 assert(DC && "This decl is not contained in a translation unit!"); 406 407 while (!DC->isTranslationUnit()) { 408 DC = DC->getParent(); 409 assert(DC && "This decl is not contained in a translation unit!"); 410 } 411 412 return cast<TranslationUnitDecl>(DC); 413 } 414 415 ASTContext &Decl::getASTContext() const { 416 return getTranslationUnitDecl()->getASTContext(); 417 } 418 419 /// Helper to get the language options from the ASTContext. 420 /// Defined out of line to avoid depending on ASTContext.h. 421 const LangOptions &Decl::getLangOpts() const { 422 return getASTContext().getLangOpts(); 423 } 424 425 ASTMutationListener *Decl::getASTMutationListener() const { 426 return getASTContext().getASTMutationListener(); 427 } 428 429 unsigned Decl::getMaxAlignment() const { 430 if (!hasAttrs()) 431 return 0; 432 433 unsigned Align = 0; 434 const AttrVec &V = getAttrs(); 435 ASTContext &Ctx = getASTContext(); 436 specific_attr_iterator<AlignedAttr> I(V.begin()), E(V.end()); 437 for (; I != E; ++I) { 438 if (!I->isAlignmentErrorDependent()) 439 Align = std::max(Align, I->getAlignment(Ctx)); 440 } 441 return Align; 442 } 443 444 bool Decl::isUsed(bool CheckUsedAttr) const { 445 const Decl *CanonD = getCanonicalDecl(); 446 if (CanonD->Used) 447 return true; 448 449 // Check for used attribute. 450 // Ask the most recent decl, since attributes accumulate in the redecl chain. 451 if (CheckUsedAttr && getMostRecentDecl()->hasAttr<UsedAttr>()) 452 return true; 453 454 // The information may have not been deserialized yet. Force deserialization 455 // to complete the needed information. 456 return getMostRecentDecl()->getCanonicalDecl()->Used; 457 } 458 459 void Decl::markUsed(ASTContext &C) { 460 if (isUsed(false)) 461 return; 462 463 if (C.getASTMutationListener()) 464 C.getASTMutationListener()->DeclarationMarkedUsed(this); 465 466 setIsUsed(); 467 } 468 469 bool Decl::isReferenced() const { 470 if (Referenced) 471 return true; 472 473 // Check redeclarations. 474 for (const auto *I : redecls()) 475 if (I->Referenced) 476 return true; 477 478 return false; 479 } 480 481 ExternalSourceSymbolAttr *Decl::getExternalSourceSymbolAttr() const { 482 const Decl *Definition = nullptr; 483 if (auto *ID = dyn_cast<ObjCInterfaceDecl>(this)) { 484 Definition = ID->getDefinition(); 485 } else if (auto *PD = dyn_cast<ObjCProtocolDecl>(this)) { 486 Definition = PD->getDefinition(); 487 } else if (auto *TD = dyn_cast<TagDecl>(this)) { 488 Definition = TD->getDefinition(); 489 } 490 if (!Definition) 491 Definition = this; 492 493 if (auto *attr = Definition->getAttr<ExternalSourceSymbolAttr>()) 494 return attr; 495 if (auto *dcd = dyn_cast<Decl>(getDeclContext())) { 496 return dcd->getAttr<ExternalSourceSymbolAttr>(); 497 } 498 499 return nullptr; 500 } 501 502 bool Decl::hasDefiningAttr() const { 503 return hasAttr<AliasAttr>() || hasAttr<IFuncAttr>() || 504 hasAttr<LoaderUninitializedAttr>(); 505 } 506 507 const Attr *Decl::getDefiningAttr() const { 508 if (auto *AA = getAttr<AliasAttr>()) 509 return AA; 510 if (auto *IFA = getAttr<IFuncAttr>()) 511 return IFA; 512 if (auto *NZA = getAttr<LoaderUninitializedAttr>()) 513 return NZA; 514 return nullptr; 515 } 516 517 static StringRef getRealizedPlatform(const AvailabilityAttr *A, 518 const ASTContext &Context) { 519 // Check if this is an App Extension "platform", and if so chop off 520 // the suffix for matching with the actual platform. 521 StringRef RealizedPlatform = A->getPlatform()->getName(); 522 if (!Context.getLangOpts().AppExt) 523 return RealizedPlatform; 524 size_t suffix = RealizedPlatform.rfind("_app_extension"); 525 if (suffix != StringRef::npos) 526 return RealizedPlatform.slice(0, suffix); 527 return RealizedPlatform; 528 } 529 530 /// Determine the availability of the given declaration based on 531 /// the target platform. 532 /// 533 /// When it returns an availability result other than \c AR_Available, 534 /// if the \p Message parameter is non-NULL, it will be set to a 535 /// string describing why the entity is unavailable. 536 /// 537 /// FIXME: Make these strings localizable, since they end up in 538 /// diagnostics. 539 static AvailabilityResult CheckAvailability(ASTContext &Context, 540 const AvailabilityAttr *A, 541 std::string *Message, 542 VersionTuple EnclosingVersion) { 543 if (EnclosingVersion.empty()) 544 EnclosingVersion = Context.getTargetInfo().getPlatformMinVersion(); 545 546 if (EnclosingVersion.empty()) 547 return AR_Available; 548 549 StringRef ActualPlatform = A->getPlatform()->getName(); 550 StringRef TargetPlatform = Context.getTargetInfo().getPlatformName(); 551 552 // Match the platform name. 553 if (getRealizedPlatform(A, Context) != TargetPlatform) 554 return AR_Available; 555 556 StringRef PrettyPlatformName 557 = AvailabilityAttr::getPrettyPlatformName(ActualPlatform); 558 559 if (PrettyPlatformName.empty()) 560 PrettyPlatformName = ActualPlatform; 561 562 std::string HintMessage; 563 if (!A->getMessage().empty()) { 564 HintMessage = " - "; 565 HintMessage += A->getMessage(); 566 } 567 568 // Make sure that this declaration has not been marked 'unavailable'. 569 if (A->getUnavailable()) { 570 if (Message) { 571 Message->clear(); 572 llvm::raw_string_ostream Out(*Message); 573 Out << "not available on " << PrettyPlatformName 574 << HintMessage; 575 } 576 577 return AR_Unavailable; 578 } 579 580 // Make sure that this declaration has already been introduced. 581 if (!A->getIntroduced().empty() && 582 EnclosingVersion < A->getIntroduced()) { 583 if (Message) { 584 Message->clear(); 585 llvm::raw_string_ostream Out(*Message); 586 VersionTuple VTI(A->getIntroduced()); 587 Out << "introduced in " << PrettyPlatformName << ' ' 588 << VTI << HintMessage; 589 } 590 591 return A->getStrict() ? AR_Unavailable : AR_NotYetIntroduced; 592 } 593 594 // Make sure that this declaration hasn't been obsoleted. 595 if (!A->getObsoleted().empty() && EnclosingVersion >= A->getObsoleted()) { 596 if (Message) { 597 Message->clear(); 598 llvm::raw_string_ostream Out(*Message); 599 VersionTuple VTO(A->getObsoleted()); 600 Out << "obsoleted in " << PrettyPlatformName << ' ' 601 << VTO << HintMessage; 602 } 603 604 return AR_Unavailable; 605 } 606 607 // Make sure that this declaration hasn't been deprecated. 608 if (!A->getDeprecated().empty() && EnclosingVersion >= A->getDeprecated()) { 609 if (Message) { 610 Message->clear(); 611 llvm::raw_string_ostream Out(*Message); 612 VersionTuple VTD(A->getDeprecated()); 613 Out << "first deprecated in " << PrettyPlatformName << ' ' 614 << VTD << HintMessage; 615 } 616 617 return AR_Deprecated; 618 } 619 620 return AR_Available; 621 } 622 623 AvailabilityResult Decl::getAvailability(std::string *Message, 624 VersionTuple EnclosingVersion, 625 StringRef *RealizedPlatform) const { 626 if (auto *FTD = dyn_cast<FunctionTemplateDecl>(this)) 627 return FTD->getTemplatedDecl()->getAvailability(Message, EnclosingVersion, 628 RealizedPlatform); 629 630 AvailabilityResult Result = AR_Available; 631 std::string ResultMessage; 632 633 for (const auto *A : attrs()) { 634 if (const auto *Deprecated = dyn_cast<DeprecatedAttr>(A)) { 635 if (Result >= AR_Deprecated) 636 continue; 637 638 if (Message) 639 ResultMessage = std::string(Deprecated->getMessage()); 640 641 Result = AR_Deprecated; 642 continue; 643 } 644 645 if (const auto *Unavailable = dyn_cast<UnavailableAttr>(A)) { 646 if (Message) 647 *Message = std::string(Unavailable->getMessage()); 648 return AR_Unavailable; 649 } 650 651 if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) { 652 AvailabilityResult AR = CheckAvailability(getASTContext(), Availability, 653 Message, EnclosingVersion); 654 655 if (AR == AR_Unavailable) { 656 if (RealizedPlatform) 657 *RealizedPlatform = Availability->getPlatform()->getName(); 658 return AR_Unavailable; 659 } 660 661 if (AR > Result) { 662 Result = AR; 663 if (Message) 664 ResultMessage.swap(*Message); 665 } 666 continue; 667 } 668 } 669 670 if (Message) 671 Message->swap(ResultMessage); 672 return Result; 673 } 674 675 VersionTuple Decl::getVersionIntroduced() const { 676 const ASTContext &Context = getASTContext(); 677 StringRef TargetPlatform = Context.getTargetInfo().getPlatformName(); 678 for (const auto *A : attrs()) { 679 if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) { 680 if (getRealizedPlatform(Availability, Context) != TargetPlatform) 681 continue; 682 if (!Availability->getIntroduced().empty()) 683 return Availability->getIntroduced(); 684 } 685 } 686 return {}; 687 } 688 689 bool Decl::canBeWeakImported(bool &IsDefinition) const { 690 IsDefinition = false; 691 692 // Variables, if they aren't definitions. 693 if (const auto *Var = dyn_cast<VarDecl>(this)) { 694 if (Var->isThisDeclarationADefinition()) { 695 IsDefinition = true; 696 return false; 697 } 698 return true; 699 } 700 // Functions, if they aren't definitions. 701 if (const auto *FD = dyn_cast<FunctionDecl>(this)) { 702 if (FD->hasBody()) { 703 IsDefinition = true; 704 return false; 705 } 706 return true; 707 708 } 709 // Objective-C classes, if this is the non-fragile runtime. 710 if (isa<ObjCInterfaceDecl>(this) && 711 getASTContext().getLangOpts().ObjCRuntime.hasWeakClassImport()) { 712 return true; 713 } 714 // Nothing else. 715 return false; 716 } 717 718 bool Decl::isWeakImported() const { 719 bool IsDefinition; 720 if (!canBeWeakImported(IsDefinition)) 721 return false; 722 723 for (const auto *A : getMostRecentDecl()->attrs()) { 724 if (isa<WeakImportAttr>(A)) 725 return true; 726 727 if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) { 728 if (CheckAvailability(getASTContext(), Availability, nullptr, 729 VersionTuple()) == AR_NotYetIntroduced) 730 return true; 731 } 732 } 733 734 return false; 735 } 736 737 unsigned Decl::getIdentifierNamespaceForKind(Kind DeclKind) { 738 switch (DeclKind) { 739 case Function: 740 case CXXDeductionGuide: 741 case CXXMethod: 742 case CXXConstructor: 743 case ConstructorUsingShadow: 744 case CXXDestructor: 745 case CXXConversion: 746 case EnumConstant: 747 case Var: 748 case ImplicitParam: 749 case ParmVar: 750 case ObjCMethod: 751 case ObjCProperty: 752 case MSProperty: 753 return IDNS_Ordinary; 754 case Label: 755 return IDNS_Label; 756 case IndirectField: 757 return IDNS_Ordinary | IDNS_Member; 758 759 case Binding: 760 case NonTypeTemplateParm: 761 case VarTemplate: 762 case Concept: 763 // These (C++-only) declarations are found by redeclaration lookup for 764 // tag types, so we include them in the tag namespace. 765 return IDNS_Ordinary | IDNS_Tag; 766 767 case ObjCCompatibleAlias: 768 case ObjCInterface: 769 return IDNS_Ordinary | IDNS_Type; 770 771 case Typedef: 772 case TypeAlias: 773 case TemplateTypeParm: 774 case ObjCTypeParam: 775 return IDNS_Ordinary | IDNS_Type; 776 777 case UnresolvedUsingTypename: 778 return IDNS_Ordinary | IDNS_Type | IDNS_Using; 779 780 case UsingShadow: 781 return 0; // we'll actually overwrite this later 782 783 case UnresolvedUsingValue: 784 return IDNS_Ordinary | IDNS_Using; 785 786 case Using: 787 case UsingPack: 788 case UsingEnum: 789 return IDNS_Using; 790 791 case ObjCProtocol: 792 return IDNS_ObjCProtocol; 793 794 case Field: 795 case ObjCAtDefsField: 796 case ObjCIvar: 797 return IDNS_Member; 798 799 case Record: 800 case CXXRecord: 801 case Enum: 802 return IDNS_Tag | IDNS_Type; 803 804 case Namespace: 805 case NamespaceAlias: 806 return IDNS_Namespace; 807 808 case FunctionTemplate: 809 return IDNS_Ordinary; 810 811 case ClassTemplate: 812 case TemplateTemplateParm: 813 case TypeAliasTemplate: 814 return IDNS_Ordinary | IDNS_Tag | IDNS_Type; 815 816 case UnresolvedUsingIfExists: 817 return IDNS_Type | IDNS_Ordinary; 818 819 case OMPDeclareReduction: 820 return IDNS_OMPReduction; 821 822 case OMPDeclareMapper: 823 return IDNS_OMPMapper; 824 825 // Never have names. 826 case Friend: 827 case FriendTemplate: 828 case AccessSpec: 829 case LinkageSpec: 830 case Export: 831 case FileScopeAsm: 832 case StaticAssert: 833 case ObjCPropertyImpl: 834 case PragmaComment: 835 case PragmaDetectMismatch: 836 case Block: 837 case Captured: 838 case TranslationUnit: 839 case ExternCContext: 840 case Decomposition: 841 case MSGuid: 842 case UnnamedGlobalConstant: 843 case TemplateParamObject: 844 845 case UsingDirective: 846 case BuiltinTemplate: 847 case ClassTemplateSpecialization: 848 case ClassTemplatePartialSpecialization: 849 case ClassScopeFunctionSpecialization: 850 case VarTemplateSpecialization: 851 case VarTemplatePartialSpecialization: 852 case ObjCImplementation: 853 case ObjCCategory: 854 case ObjCCategoryImpl: 855 case Import: 856 case OMPThreadPrivate: 857 case OMPAllocate: 858 case OMPRequires: 859 case OMPCapturedExpr: 860 case Empty: 861 case LifetimeExtendedTemporary: 862 case RequiresExprBody: 863 // Never looked up by name. 864 return 0; 865 } 866 867 llvm_unreachable("Invalid DeclKind!"); 868 } 869 870 void Decl::setAttrsImpl(const AttrVec &attrs, ASTContext &Ctx) { 871 assert(!HasAttrs && "Decl already contains attrs."); 872 873 AttrVec &AttrBlank = Ctx.getDeclAttrs(this); 874 assert(AttrBlank.empty() && "HasAttrs was wrong?"); 875 876 AttrBlank = attrs; 877 HasAttrs = true; 878 } 879 880 void Decl::dropAttrs() { 881 if (!HasAttrs) return; 882 883 HasAttrs = false; 884 getASTContext().eraseDeclAttrs(this); 885 } 886 887 void Decl::addAttr(Attr *A) { 888 if (!hasAttrs()) { 889 setAttrs(AttrVec(1, A)); 890 return; 891 } 892 893 AttrVec &Attrs = getAttrs(); 894 if (!A->isInherited()) { 895 Attrs.push_back(A); 896 return; 897 } 898 899 // Attribute inheritance is processed after attribute parsing. To keep the 900 // order as in the source code, add inherited attributes before non-inherited 901 // ones. 902 auto I = Attrs.begin(), E = Attrs.end(); 903 for (; I != E; ++I) { 904 if (!(*I)->isInherited()) 905 break; 906 } 907 Attrs.insert(I, A); 908 } 909 910 const AttrVec &Decl::getAttrs() const { 911 assert(HasAttrs && "No attrs to get!"); 912 return getASTContext().getDeclAttrs(this); 913 } 914 915 Decl *Decl::castFromDeclContext (const DeclContext *D) { 916 Decl::Kind DK = D->getDeclKind(); 917 switch(DK) { 918 #define DECL(NAME, BASE) 919 #define DECL_CONTEXT(NAME) \ 920 case Decl::NAME: \ 921 return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D)); 922 #define DECL_CONTEXT_BASE(NAME) 923 #include "clang/AST/DeclNodes.inc" 924 default: 925 #define DECL(NAME, BASE) 926 #define DECL_CONTEXT_BASE(NAME) \ 927 if (DK >= first##NAME && DK <= last##NAME) \ 928 return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D)); 929 #include "clang/AST/DeclNodes.inc" 930 llvm_unreachable("a decl that inherits DeclContext isn't handled"); 931 } 932 } 933 934 DeclContext *Decl::castToDeclContext(const Decl *D) { 935 Decl::Kind DK = D->getKind(); 936 switch(DK) { 937 #define DECL(NAME, BASE) 938 #define DECL_CONTEXT(NAME) \ 939 case Decl::NAME: \ 940 return static_cast<NAME##Decl *>(const_cast<Decl *>(D)); 941 #define DECL_CONTEXT_BASE(NAME) 942 #include "clang/AST/DeclNodes.inc" 943 default: 944 #define DECL(NAME, BASE) 945 #define DECL_CONTEXT_BASE(NAME) \ 946 if (DK >= first##NAME && DK <= last##NAME) \ 947 return static_cast<NAME##Decl *>(const_cast<Decl *>(D)); 948 #include "clang/AST/DeclNodes.inc" 949 llvm_unreachable("a decl that inherits DeclContext isn't handled"); 950 } 951 } 952 953 SourceLocation Decl::getBodyRBrace() const { 954 // Special handling of FunctionDecl to avoid de-serializing the body from PCH. 955 // FunctionDecl stores EndRangeLoc for this purpose. 956 if (const auto *FD = dyn_cast<FunctionDecl>(this)) { 957 const FunctionDecl *Definition; 958 if (FD->hasBody(Definition)) 959 return Definition->getSourceRange().getEnd(); 960 return {}; 961 } 962 963 if (Stmt *Body = getBody()) 964 return Body->getSourceRange().getEnd(); 965 966 return {}; 967 } 968 969 bool Decl::AccessDeclContextCheck() const { 970 #ifndef NDEBUG 971 // Suppress this check if any of the following hold: 972 // 1. this is the translation unit (and thus has no parent) 973 // 2. this is a template parameter (and thus doesn't belong to its context) 974 // 3. this is a non-type template parameter 975 // 4. the context is not a record 976 // 5. it's invalid 977 // 6. it's a C++0x static_assert. 978 // 7. it's a block literal declaration 979 // 8. it's a temporary with lifetime extended due to being default value. 980 if (isa<TranslationUnitDecl>(this) || isa<TemplateTypeParmDecl>(this) || 981 isa<NonTypeTemplateParmDecl>(this) || !getDeclContext() || 982 !isa<CXXRecordDecl>(getDeclContext()) || isInvalidDecl() || 983 isa<StaticAssertDecl>(this) || isa<BlockDecl>(this) || 984 // FIXME: a ParmVarDecl can have ClassTemplateSpecialization 985 // as DeclContext (?). 986 isa<ParmVarDecl>(this) || 987 // FIXME: a ClassTemplateSpecialization or CXXRecordDecl can have 988 // AS_none as access specifier. 989 isa<CXXRecordDecl>(this) || 990 isa<ClassScopeFunctionSpecializationDecl>(this) || 991 isa<LifetimeExtendedTemporaryDecl>(this)) 992 return true; 993 994 assert(Access != AS_none && 995 "Access specifier is AS_none inside a record decl"); 996 #endif 997 return true; 998 } 999 1000 bool Decl::isInExportDeclContext() const { 1001 const DeclContext *DC = getLexicalDeclContext(); 1002 1003 while (DC && !isa<ExportDecl>(DC)) 1004 DC = DC->getLexicalParent(); 1005 1006 return DC && isa<ExportDecl>(DC); 1007 } 1008 1009 static Decl::Kind getKind(const Decl *D) { return D->getKind(); } 1010 static Decl::Kind getKind(const DeclContext *DC) { return DC->getDeclKind(); } 1011 1012 int64_t Decl::getID() const { 1013 return getASTContext().getAllocator().identifyKnownAlignedObject<Decl>(this); 1014 } 1015 1016 const FunctionType *Decl::getFunctionType(bool BlocksToo) const { 1017 QualType Ty; 1018 if (const auto *D = dyn_cast<ValueDecl>(this)) 1019 Ty = D->getType(); 1020 else if (const auto *D = dyn_cast<TypedefNameDecl>(this)) 1021 Ty = D->getUnderlyingType(); 1022 else 1023 return nullptr; 1024 1025 if (Ty->isFunctionPointerType()) 1026 Ty = Ty->castAs<PointerType>()->getPointeeType(); 1027 else if (Ty->isFunctionReferenceType()) 1028 Ty = Ty->castAs<ReferenceType>()->getPointeeType(); 1029 else if (BlocksToo && Ty->isBlockPointerType()) 1030 Ty = Ty->castAs<BlockPointerType>()->getPointeeType(); 1031 1032 return Ty->getAs<FunctionType>(); 1033 } 1034 1035 /// Starting at a given context (a Decl or DeclContext), look for a 1036 /// code context that is not a closure (a lambda, block, etc.). 1037 template <class T> static Decl *getNonClosureContext(T *D) { 1038 if (getKind(D) == Decl::CXXMethod) { 1039 auto *MD = cast<CXXMethodDecl>(D); 1040 if (MD->getOverloadedOperator() == OO_Call && 1041 MD->getParent()->isLambda()) 1042 return getNonClosureContext(MD->getParent()->getParent()); 1043 return MD; 1044 } 1045 if (auto *FD = dyn_cast<FunctionDecl>(D)) 1046 return FD; 1047 if (auto *MD = dyn_cast<ObjCMethodDecl>(D)) 1048 return MD; 1049 if (auto *BD = dyn_cast<BlockDecl>(D)) 1050 return getNonClosureContext(BD->getParent()); 1051 if (auto *CD = dyn_cast<CapturedDecl>(D)) 1052 return getNonClosureContext(CD->getParent()); 1053 return nullptr; 1054 } 1055 1056 Decl *Decl::getNonClosureContext() { 1057 return ::getNonClosureContext(this); 1058 } 1059 1060 Decl *DeclContext::getNonClosureAncestor() { 1061 return ::getNonClosureContext(this); 1062 } 1063 1064 //===----------------------------------------------------------------------===// 1065 // DeclContext Implementation 1066 //===----------------------------------------------------------------------===// 1067 1068 DeclContext::DeclContext(Decl::Kind K) { 1069 DeclContextBits.DeclKind = K; 1070 setHasExternalLexicalStorage(false); 1071 setHasExternalVisibleStorage(false); 1072 setNeedToReconcileExternalVisibleStorage(false); 1073 setHasLazyLocalLexicalLookups(false); 1074 setHasLazyExternalLexicalLookups(false); 1075 setUseQualifiedLookup(false); 1076 } 1077 1078 bool DeclContext::classof(const Decl *D) { 1079 switch (D->getKind()) { 1080 #define DECL(NAME, BASE) 1081 #define DECL_CONTEXT(NAME) case Decl::NAME: 1082 #define DECL_CONTEXT_BASE(NAME) 1083 #include "clang/AST/DeclNodes.inc" 1084 return true; 1085 default: 1086 #define DECL(NAME, BASE) 1087 #define DECL_CONTEXT_BASE(NAME) \ 1088 if (D->getKind() >= Decl::first##NAME && \ 1089 D->getKind() <= Decl::last##NAME) \ 1090 return true; 1091 #include "clang/AST/DeclNodes.inc" 1092 return false; 1093 } 1094 } 1095 1096 DeclContext::~DeclContext() = default; 1097 1098 /// Find the parent context of this context that will be 1099 /// used for unqualified name lookup. 1100 /// 1101 /// Generally, the parent lookup context is the semantic context. However, for 1102 /// a friend function the parent lookup context is the lexical context, which 1103 /// is the class in which the friend is declared. 1104 DeclContext *DeclContext::getLookupParent() { 1105 // FIXME: Find a better way to identify friends. 1106 if (isa<FunctionDecl>(this)) 1107 if (getParent()->getRedeclContext()->isFileContext() && 1108 getLexicalParent()->getRedeclContext()->isRecord()) 1109 return getLexicalParent(); 1110 1111 // A lookup within the call operator of a lambda never looks in the lambda 1112 // class; instead, skip to the context in which that closure type is 1113 // declared. 1114 if (isLambdaCallOperator(this)) 1115 return getParent()->getParent(); 1116 1117 return getParent(); 1118 } 1119 1120 const BlockDecl *DeclContext::getInnermostBlockDecl() const { 1121 const DeclContext *Ctx = this; 1122 1123 do { 1124 if (Ctx->isClosure()) 1125 return cast<BlockDecl>(Ctx); 1126 Ctx = Ctx->getParent(); 1127 } while (Ctx); 1128 1129 return nullptr; 1130 } 1131 1132 bool DeclContext::isInlineNamespace() const { 1133 return isNamespace() && 1134 cast<NamespaceDecl>(this)->isInline(); 1135 } 1136 1137 bool DeclContext::isStdNamespace() const { 1138 if (!isNamespace()) 1139 return false; 1140 1141 const auto *ND = cast<NamespaceDecl>(this); 1142 if (ND->isInline()) { 1143 return ND->getParent()->isStdNamespace(); 1144 } 1145 1146 if (!getParent()->getRedeclContext()->isTranslationUnit()) 1147 return false; 1148 1149 const IdentifierInfo *II = ND->getIdentifier(); 1150 return II && II->isStr("std"); 1151 } 1152 1153 bool DeclContext::isDependentContext() const { 1154 if (isFileContext()) 1155 return false; 1156 1157 if (isa<ClassTemplatePartialSpecializationDecl>(this)) 1158 return true; 1159 1160 if (const auto *Record = dyn_cast<CXXRecordDecl>(this)) { 1161 if (Record->getDescribedClassTemplate()) 1162 return true; 1163 1164 if (Record->isDependentLambda()) 1165 return true; 1166 if (Record->isNeverDependentLambda()) 1167 return false; 1168 } 1169 1170 if (const auto *Function = dyn_cast<FunctionDecl>(this)) { 1171 if (Function->getDescribedFunctionTemplate()) 1172 return true; 1173 1174 // Friend function declarations are dependent if their *lexical* 1175 // context is dependent. 1176 if (cast<Decl>(this)->getFriendObjectKind()) 1177 return getLexicalParent()->isDependentContext(); 1178 } 1179 1180 // FIXME: A variable template is a dependent context, but is not a 1181 // DeclContext. A context within it (such as a lambda-expression) 1182 // should be considered dependent. 1183 1184 return getParent() && getParent()->isDependentContext(); 1185 } 1186 1187 bool DeclContext::isTransparentContext() const { 1188 if (getDeclKind() == Decl::Enum) 1189 return !cast<EnumDecl>(this)->isScoped(); 1190 1191 return getDeclKind() == Decl::LinkageSpec || getDeclKind() == Decl::Export; 1192 } 1193 1194 static bool isLinkageSpecContext(const DeclContext *DC, 1195 LinkageSpecDecl::LanguageIDs ID) { 1196 while (DC->getDeclKind() != Decl::TranslationUnit) { 1197 if (DC->getDeclKind() == Decl::LinkageSpec) 1198 return cast<LinkageSpecDecl>(DC)->getLanguage() == ID; 1199 DC = DC->getLexicalParent(); 1200 } 1201 return false; 1202 } 1203 1204 bool DeclContext::isExternCContext() const { 1205 return isLinkageSpecContext(this, LinkageSpecDecl::lang_c); 1206 } 1207 1208 const LinkageSpecDecl *DeclContext::getExternCContext() const { 1209 const DeclContext *DC = this; 1210 while (DC->getDeclKind() != Decl::TranslationUnit) { 1211 if (DC->getDeclKind() == Decl::LinkageSpec && 1212 cast<LinkageSpecDecl>(DC)->getLanguage() == LinkageSpecDecl::lang_c) 1213 return cast<LinkageSpecDecl>(DC); 1214 DC = DC->getLexicalParent(); 1215 } 1216 return nullptr; 1217 } 1218 1219 bool DeclContext::isExternCXXContext() const { 1220 return isLinkageSpecContext(this, LinkageSpecDecl::lang_cxx); 1221 } 1222 1223 bool DeclContext::Encloses(const DeclContext *DC) const { 1224 if (getPrimaryContext() != this) 1225 return getPrimaryContext()->Encloses(DC); 1226 1227 for (; DC; DC = DC->getParent()) 1228 if (!isa<LinkageSpecDecl>(DC) && !isa<ExportDecl>(DC) && 1229 DC->getPrimaryContext() == this) 1230 return true; 1231 return false; 1232 } 1233 1234 DeclContext *DeclContext::getNonTransparentContext() { 1235 DeclContext *DC = this; 1236 while (DC->isTransparentContext()) { 1237 DC = DC->getParent(); 1238 assert(DC && "All transparent contexts should have a parent!"); 1239 } 1240 return DC; 1241 } 1242 1243 DeclContext *DeclContext::getPrimaryContext() { 1244 switch (getDeclKind()) { 1245 case Decl::ExternCContext: 1246 case Decl::LinkageSpec: 1247 case Decl::Export: 1248 case Decl::Block: 1249 case Decl::Captured: 1250 case Decl::OMPDeclareReduction: 1251 case Decl::OMPDeclareMapper: 1252 case Decl::RequiresExprBody: 1253 // There is only one DeclContext for these entities. 1254 return this; 1255 1256 case Decl::TranslationUnit: 1257 return static_cast<TranslationUnitDecl *>(this)->getFirstDecl(); 1258 case Decl::Namespace: 1259 // The original namespace is our primary context. 1260 return static_cast<NamespaceDecl *>(this)->getOriginalNamespace(); 1261 1262 case Decl::ObjCMethod: 1263 return this; 1264 1265 case Decl::ObjCInterface: 1266 if (auto *OID = dyn_cast<ObjCInterfaceDecl>(this)) 1267 if (auto *Def = OID->getDefinition()) 1268 return Def; 1269 return this; 1270 1271 case Decl::ObjCProtocol: 1272 if (auto *OPD = dyn_cast<ObjCProtocolDecl>(this)) 1273 if (auto *Def = OPD->getDefinition()) 1274 return Def; 1275 return this; 1276 1277 case Decl::ObjCCategory: 1278 return this; 1279 1280 case Decl::ObjCImplementation: 1281 case Decl::ObjCCategoryImpl: 1282 return this; 1283 1284 default: 1285 if (getDeclKind() >= Decl::firstTag && getDeclKind() <= Decl::lastTag) { 1286 // If this is a tag type that has a definition or is currently 1287 // being defined, that definition is our primary context. 1288 auto *Tag = cast<TagDecl>(this); 1289 1290 if (TagDecl *Def = Tag->getDefinition()) 1291 return Def; 1292 1293 if (const auto *TagTy = dyn_cast<TagType>(Tag->getTypeForDecl())) { 1294 // Note, TagType::getDecl returns the (partial) definition one exists. 1295 TagDecl *PossiblePartialDef = TagTy->getDecl(); 1296 if (PossiblePartialDef->isBeingDefined()) 1297 return PossiblePartialDef; 1298 } else { 1299 assert(isa<InjectedClassNameType>(Tag->getTypeForDecl())); 1300 } 1301 1302 return Tag; 1303 } 1304 1305 assert(getDeclKind() >= Decl::firstFunction && 1306 getDeclKind() <= Decl::lastFunction && 1307 "Unknown DeclContext kind"); 1308 return this; 1309 } 1310 } 1311 1312 template <typename T> 1313 void collectAllContextsImpl(T *Self, SmallVectorImpl<DeclContext *> &Contexts) { 1314 for (T *D = Self->getMostRecentDecl(); D; D = D->getPreviousDecl()) 1315 Contexts.push_back(D); 1316 1317 std::reverse(Contexts.begin(), Contexts.end()); 1318 } 1319 1320 void DeclContext::collectAllContexts(SmallVectorImpl<DeclContext *> &Contexts) { 1321 Contexts.clear(); 1322 1323 Decl::Kind Kind = getDeclKind(); 1324 1325 if (Kind == Decl::TranslationUnit) 1326 collectAllContextsImpl(static_cast<TranslationUnitDecl *>(this), Contexts); 1327 else if (Kind == Decl::Namespace) 1328 collectAllContextsImpl(static_cast<NamespaceDecl *>(this), Contexts); 1329 else 1330 Contexts.push_back(this); 1331 } 1332 1333 std::pair<Decl *, Decl *> 1334 DeclContext::BuildDeclChain(ArrayRef<Decl *> Decls, 1335 bool FieldsAlreadyLoaded) { 1336 // Build up a chain of declarations via the Decl::NextInContextAndBits field. 1337 Decl *FirstNewDecl = nullptr; 1338 Decl *PrevDecl = nullptr; 1339 for (auto *D : Decls) { 1340 if (FieldsAlreadyLoaded && isa<FieldDecl>(D)) 1341 continue; 1342 1343 if (PrevDecl) 1344 PrevDecl->NextInContextAndBits.setPointer(D); 1345 else 1346 FirstNewDecl = D; 1347 1348 PrevDecl = D; 1349 } 1350 1351 return std::make_pair(FirstNewDecl, PrevDecl); 1352 } 1353 1354 /// We have just acquired external visible storage, and we already have 1355 /// built a lookup map. For every name in the map, pull in the new names from 1356 /// the external storage. 1357 void DeclContext::reconcileExternalVisibleStorage() const { 1358 assert(hasNeedToReconcileExternalVisibleStorage() && LookupPtr); 1359 setNeedToReconcileExternalVisibleStorage(false); 1360 1361 for (auto &Lookup : *LookupPtr) 1362 Lookup.second.setHasExternalDecls(); 1363 } 1364 1365 /// Load the declarations within this lexical storage from an 1366 /// external source. 1367 /// \return \c true if any declarations were added. 1368 bool 1369 DeclContext::LoadLexicalDeclsFromExternalStorage() const { 1370 ExternalASTSource *Source = getParentASTContext().getExternalSource(); 1371 assert(hasExternalLexicalStorage() && Source && "No external storage?"); 1372 1373 // Notify that we have a DeclContext that is initializing. 1374 ExternalASTSource::Deserializing ADeclContext(Source); 1375 1376 // Load the external declarations, if any. 1377 SmallVector<Decl*, 64> Decls; 1378 setHasExternalLexicalStorage(false); 1379 Source->FindExternalLexicalDecls(this, Decls); 1380 1381 if (Decls.empty()) 1382 return false; 1383 1384 // We may have already loaded just the fields of this record, in which case 1385 // we need to ignore them. 1386 bool FieldsAlreadyLoaded = false; 1387 if (const auto *RD = dyn_cast<RecordDecl>(this)) 1388 FieldsAlreadyLoaded = RD->hasLoadedFieldsFromExternalStorage(); 1389 1390 // Splice the newly-read declarations into the beginning of the list 1391 // of declarations. 1392 Decl *ExternalFirst, *ExternalLast; 1393 std::tie(ExternalFirst, ExternalLast) = 1394 BuildDeclChain(Decls, FieldsAlreadyLoaded); 1395 ExternalLast->NextInContextAndBits.setPointer(FirstDecl); 1396 FirstDecl = ExternalFirst; 1397 if (!LastDecl) 1398 LastDecl = ExternalLast; 1399 return true; 1400 } 1401 1402 DeclContext::lookup_result 1403 ExternalASTSource::SetNoExternalVisibleDeclsForName(const DeclContext *DC, 1404 DeclarationName Name) { 1405 ASTContext &Context = DC->getParentASTContext(); 1406 StoredDeclsMap *Map; 1407 if (!(Map = DC->LookupPtr)) 1408 Map = DC->CreateStoredDeclsMap(Context); 1409 if (DC->hasNeedToReconcileExternalVisibleStorage()) 1410 DC->reconcileExternalVisibleStorage(); 1411 1412 (*Map)[Name].removeExternalDecls(); 1413 1414 return DeclContext::lookup_result(); 1415 } 1416 1417 DeclContext::lookup_result 1418 ExternalASTSource::SetExternalVisibleDeclsForName(const DeclContext *DC, 1419 DeclarationName Name, 1420 ArrayRef<NamedDecl*> Decls) { 1421 ASTContext &Context = DC->getParentASTContext(); 1422 StoredDeclsMap *Map; 1423 if (!(Map = DC->LookupPtr)) 1424 Map = DC->CreateStoredDeclsMap(Context); 1425 if (DC->hasNeedToReconcileExternalVisibleStorage()) 1426 DC->reconcileExternalVisibleStorage(); 1427 1428 StoredDeclsList &List = (*Map)[Name]; 1429 List.replaceExternalDecls(Decls); 1430 return List.getLookupResult(); 1431 } 1432 1433 DeclContext::decl_iterator DeclContext::decls_begin() const { 1434 if (hasExternalLexicalStorage()) 1435 LoadLexicalDeclsFromExternalStorage(); 1436 return decl_iterator(FirstDecl); 1437 } 1438 1439 bool DeclContext::decls_empty() const { 1440 if (hasExternalLexicalStorage()) 1441 LoadLexicalDeclsFromExternalStorage(); 1442 1443 return !FirstDecl; 1444 } 1445 1446 bool DeclContext::containsDecl(Decl *D) const { 1447 return (D->getLexicalDeclContext() == this && 1448 (D->NextInContextAndBits.getPointer() || D == LastDecl)); 1449 } 1450 1451 bool DeclContext::containsDeclAndLoad(Decl *D) const { 1452 if (hasExternalLexicalStorage()) 1453 LoadLexicalDeclsFromExternalStorage(); 1454 return containsDecl(D); 1455 } 1456 1457 /// shouldBeHidden - Determine whether a declaration which was declared 1458 /// within its semantic context should be invisible to qualified name lookup. 1459 static bool shouldBeHidden(NamedDecl *D) { 1460 // Skip unnamed declarations. 1461 if (!D->getDeclName()) 1462 return true; 1463 1464 // Skip entities that can't be found by name lookup into a particular 1465 // context. 1466 if ((D->getIdentifierNamespace() == 0 && !isa<UsingDirectiveDecl>(D)) || 1467 D->isTemplateParameter()) 1468 return true; 1469 1470 // Skip friends and local extern declarations unless they're the first 1471 // declaration of the entity. 1472 if ((D->isLocalExternDecl() || D->getFriendObjectKind()) && 1473 D != D->getCanonicalDecl()) 1474 return true; 1475 1476 // Skip template specializations. 1477 // FIXME: This feels like a hack. Should DeclarationName support 1478 // template-ids, or is there a better way to keep specializations 1479 // from being visible? 1480 if (isa<ClassTemplateSpecializationDecl>(D)) 1481 return true; 1482 if (auto *FD = dyn_cast<FunctionDecl>(D)) 1483 if (FD->isFunctionTemplateSpecialization()) 1484 return true; 1485 1486 // Hide destructors that are invalid. There should always be one destructor, 1487 // but if it is an invalid decl, another one is created. We need to hide the 1488 // invalid one from places that expect exactly one destructor, like the 1489 // serialization code. 1490 if (isa<CXXDestructorDecl>(D) && D->isInvalidDecl()) 1491 return true; 1492 1493 return false; 1494 } 1495 1496 void DeclContext::removeDecl(Decl *D) { 1497 assert(D->getLexicalDeclContext() == this && 1498 "decl being removed from non-lexical context"); 1499 assert((D->NextInContextAndBits.getPointer() || D == LastDecl) && 1500 "decl is not in decls list"); 1501 1502 // Remove D from the decl chain. This is O(n) but hopefully rare. 1503 if (D == FirstDecl) { 1504 if (D == LastDecl) 1505 FirstDecl = LastDecl = nullptr; 1506 else 1507 FirstDecl = D->NextInContextAndBits.getPointer(); 1508 } else { 1509 for (Decl *I = FirstDecl; true; I = I->NextInContextAndBits.getPointer()) { 1510 assert(I && "decl not found in linked list"); 1511 if (I->NextInContextAndBits.getPointer() == D) { 1512 I->NextInContextAndBits.setPointer(D->NextInContextAndBits.getPointer()); 1513 if (D == LastDecl) LastDecl = I; 1514 break; 1515 } 1516 } 1517 } 1518 1519 // Mark that D is no longer in the decl chain. 1520 D->NextInContextAndBits.setPointer(nullptr); 1521 1522 // Remove D from the lookup table if necessary. 1523 if (isa<NamedDecl>(D)) { 1524 auto *ND = cast<NamedDecl>(D); 1525 1526 // Do not try to remove the declaration if that is invisible to qualified 1527 // lookup. E.g. template specializations are skipped. 1528 if (shouldBeHidden(ND)) 1529 return; 1530 1531 // Remove only decls that have a name 1532 if (!ND->getDeclName()) 1533 return; 1534 1535 auto *DC = D->getDeclContext(); 1536 do { 1537 StoredDeclsMap *Map = DC->getPrimaryContext()->LookupPtr; 1538 if (Map) { 1539 StoredDeclsMap::iterator Pos = Map->find(ND->getDeclName()); 1540 assert(Pos != Map->end() && "no lookup entry for decl"); 1541 StoredDeclsList &List = Pos->second; 1542 List.remove(ND); 1543 // Clean up the entry if there are no more decls. 1544 if (List.isNull()) 1545 Map->erase(Pos); 1546 } 1547 } while (DC->isTransparentContext() && (DC = DC->getParent())); 1548 } 1549 } 1550 1551 void DeclContext::addHiddenDecl(Decl *D) { 1552 assert(D->getLexicalDeclContext() == this && 1553 "Decl inserted into wrong lexical context"); 1554 assert(!D->getNextDeclInContext() && D != LastDecl && 1555 "Decl already inserted into a DeclContext"); 1556 1557 if (FirstDecl) { 1558 LastDecl->NextInContextAndBits.setPointer(D); 1559 LastDecl = D; 1560 } else { 1561 FirstDecl = LastDecl = D; 1562 } 1563 1564 // Notify a C++ record declaration that we've added a member, so it can 1565 // update its class-specific state. 1566 if (auto *Record = dyn_cast<CXXRecordDecl>(this)) 1567 Record->addedMember(D); 1568 1569 // If this is a newly-created (not de-serialized) import declaration, wire 1570 // it in to the list of local import declarations. 1571 if (!D->isFromASTFile()) { 1572 if (auto *Import = dyn_cast<ImportDecl>(D)) 1573 D->getASTContext().addedLocalImportDecl(Import); 1574 } 1575 } 1576 1577 void DeclContext::addDecl(Decl *D) { 1578 addHiddenDecl(D); 1579 1580 if (auto *ND = dyn_cast<NamedDecl>(D)) 1581 ND->getDeclContext()->getPrimaryContext()-> 1582 makeDeclVisibleInContextWithFlags(ND, false, true); 1583 } 1584 1585 void DeclContext::addDeclInternal(Decl *D) { 1586 addHiddenDecl(D); 1587 1588 if (auto *ND = dyn_cast<NamedDecl>(D)) 1589 ND->getDeclContext()->getPrimaryContext()-> 1590 makeDeclVisibleInContextWithFlags(ND, true, true); 1591 } 1592 1593 /// buildLookup - Build the lookup data structure with all of the 1594 /// declarations in this DeclContext (and any other contexts linked 1595 /// to it or transparent contexts nested within it) and return it. 1596 /// 1597 /// Note that the produced map may miss out declarations from an 1598 /// external source. If it does, those entries will be marked with 1599 /// the 'hasExternalDecls' flag. 1600 StoredDeclsMap *DeclContext::buildLookup() { 1601 assert(this == getPrimaryContext() && "buildLookup called on non-primary DC"); 1602 1603 if (!hasLazyLocalLexicalLookups() && 1604 !hasLazyExternalLexicalLookups()) 1605 return LookupPtr; 1606 1607 SmallVector<DeclContext *, 2> Contexts; 1608 collectAllContexts(Contexts); 1609 1610 if (hasLazyExternalLexicalLookups()) { 1611 setHasLazyExternalLexicalLookups(false); 1612 for (auto *DC : Contexts) { 1613 if (DC->hasExternalLexicalStorage()) { 1614 bool LoadedDecls = DC->LoadLexicalDeclsFromExternalStorage(); 1615 setHasLazyLocalLexicalLookups( 1616 hasLazyLocalLexicalLookups() | LoadedDecls ); 1617 } 1618 } 1619 1620 if (!hasLazyLocalLexicalLookups()) 1621 return LookupPtr; 1622 } 1623 1624 for (auto *DC : Contexts) 1625 buildLookupImpl(DC, hasExternalVisibleStorage()); 1626 1627 // We no longer have any lazy decls. 1628 setHasLazyLocalLexicalLookups(false); 1629 return LookupPtr; 1630 } 1631 1632 /// buildLookupImpl - Build part of the lookup data structure for the 1633 /// declarations contained within DCtx, which will either be this 1634 /// DeclContext, a DeclContext linked to it, or a transparent context 1635 /// nested within it. 1636 void DeclContext::buildLookupImpl(DeclContext *DCtx, bool Internal) { 1637 for (auto *D : DCtx->noload_decls()) { 1638 // Insert this declaration into the lookup structure, but only if 1639 // it's semantically within its decl context. Any other decls which 1640 // should be found in this context are added eagerly. 1641 // 1642 // If it's from an AST file, don't add it now. It'll get handled by 1643 // FindExternalVisibleDeclsByName if needed. Exception: if we're not 1644 // in C++, we do not track external visible decls for the TU, so in 1645 // that case we need to collect them all here. 1646 if (auto *ND = dyn_cast<NamedDecl>(D)) 1647 if (ND->getDeclContext() == DCtx && !shouldBeHidden(ND) && 1648 (!ND->isFromASTFile() || 1649 (isTranslationUnit() && 1650 !getParentASTContext().getLangOpts().CPlusPlus))) 1651 makeDeclVisibleInContextImpl(ND, Internal); 1652 1653 // If this declaration is itself a transparent declaration context 1654 // or inline namespace, add the members of this declaration of that 1655 // context (recursively). 1656 if (auto *InnerCtx = dyn_cast<DeclContext>(D)) 1657 if (InnerCtx->isTransparentContext() || InnerCtx->isInlineNamespace()) 1658 buildLookupImpl(InnerCtx, Internal); 1659 } 1660 } 1661 1662 DeclContext::lookup_result 1663 DeclContext::lookup(DeclarationName Name) const { 1664 // For transparent DeclContext, we should lookup in their enclosing context. 1665 if (getDeclKind() == Decl::LinkageSpec || getDeclKind() == Decl::Export) 1666 return getParent()->lookup(Name); 1667 1668 const DeclContext *PrimaryContext = getPrimaryContext(); 1669 if (PrimaryContext != this) 1670 return PrimaryContext->lookup(Name); 1671 1672 // If we have an external source, ensure that any later redeclarations of this 1673 // context have been loaded, since they may add names to the result of this 1674 // lookup (or add external visible storage). 1675 ExternalASTSource *Source = getParentASTContext().getExternalSource(); 1676 if (Source) 1677 (void)cast<Decl>(this)->getMostRecentDecl(); 1678 1679 if (hasExternalVisibleStorage()) { 1680 assert(Source && "external visible storage but no external source?"); 1681 1682 if (hasNeedToReconcileExternalVisibleStorage()) 1683 reconcileExternalVisibleStorage(); 1684 1685 StoredDeclsMap *Map = LookupPtr; 1686 1687 if (hasLazyLocalLexicalLookups() || 1688 hasLazyExternalLexicalLookups()) 1689 // FIXME: Make buildLookup const? 1690 Map = const_cast<DeclContext*>(this)->buildLookup(); 1691 1692 if (!Map) 1693 Map = CreateStoredDeclsMap(getParentASTContext()); 1694 1695 // If we have a lookup result with no external decls, we are done. 1696 std::pair<StoredDeclsMap::iterator, bool> R = 1697 Map->insert(std::make_pair(Name, StoredDeclsList())); 1698 if (!R.second && !R.first->second.hasExternalDecls()) 1699 return R.first->second.getLookupResult(); 1700 1701 if (Source->FindExternalVisibleDeclsByName(this, Name) || !R.second) { 1702 if (StoredDeclsMap *Map = LookupPtr) { 1703 StoredDeclsMap::iterator I = Map->find(Name); 1704 if (I != Map->end()) 1705 return I->second.getLookupResult(); 1706 } 1707 } 1708 1709 return {}; 1710 } 1711 1712 StoredDeclsMap *Map = LookupPtr; 1713 if (hasLazyLocalLexicalLookups() || 1714 hasLazyExternalLexicalLookups()) 1715 Map = const_cast<DeclContext*>(this)->buildLookup(); 1716 1717 if (!Map) 1718 return {}; 1719 1720 StoredDeclsMap::iterator I = Map->find(Name); 1721 if (I == Map->end()) 1722 return {}; 1723 1724 return I->second.getLookupResult(); 1725 } 1726 1727 DeclContext::lookup_result 1728 DeclContext::noload_lookup(DeclarationName Name) { 1729 assert(getDeclKind() != Decl::LinkageSpec && 1730 getDeclKind() != Decl::Export && 1731 "should not perform lookups into transparent contexts"); 1732 1733 DeclContext *PrimaryContext = getPrimaryContext(); 1734 if (PrimaryContext != this) 1735 return PrimaryContext->noload_lookup(Name); 1736 1737 loadLazyLocalLexicalLookups(); 1738 StoredDeclsMap *Map = LookupPtr; 1739 if (!Map) 1740 return {}; 1741 1742 StoredDeclsMap::iterator I = Map->find(Name); 1743 return I != Map->end() ? I->second.getLookupResult() 1744 : lookup_result(); 1745 } 1746 1747 // If we have any lazy lexical declarations not in our lookup map, add them 1748 // now. Don't import any external declarations, not even if we know we have 1749 // some missing from the external visible lookups. 1750 void DeclContext::loadLazyLocalLexicalLookups() { 1751 if (hasLazyLocalLexicalLookups()) { 1752 SmallVector<DeclContext *, 2> Contexts; 1753 collectAllContexts(Contexts); 1754 for (auto *Context : Contexts) 1755 buildLookupImpl(Context, hasExternalVisibleStorage()); 1756 setHasLazyLocalLexicalLookups(false); 1757 } 1758 } 1759 1760 void DeclContext::localUncachedLookup(DeclarationName Name, 1761 SmallVectorImpl<NamedDecl *> &Results) { 1762 Results.clear(); 1763 1764 // If there's no external storage, just perform a normal lookup and copy 1765 // the results. 1766 if (!hasExternalVisibleStorage() && !hasExternalLexicalStorage() && Name) { 1767 lookup_result LookupResults = lookup(Name); 1768 Results.insert(Results.end(), LookupResults.begin(), LookupResults.end()); 1769 return; 1770 } 1771 1772 // If we have a lookup table, check there first. Maybe we'll get lucky. 1773 // FIXME: Should we be checking these flags on the primary context? 1774 if (Name && !hasLazyLocalLexicalLookups() && 1775 !hasLazyExternalLexicalLookups()) { 1776 if (StoredDeclsMap *Map = LookupPtr) { 1777 StoredDeclsMap::iterator Pos = Map->find(Name); 1778 if (Pos != Map->end()) { 1779 Results.insert(Results.end(), 1780 Pos->second.getLookupResult().begin(), 1781 Pos->second.getLookupResult().end()); 1782 return; 1783 } 1784 } 1785 } 1786 1787 // Slow case: grovel through the declarations in our chain looking for 1788 // matches. 1789 // FIXME: If we have lazy external declarations, this will not find them! 1790 // FIXME: Should we CollectAllContexts and walk them all here? 1791 for (Decl *D = FirstDecl; D; D = D->getNextDeclInContext()) { 1792 if (auto *ND = dyn_cast<NamedDecl>(D)) 1793 if (ND->getDeclName() == Name) 1794 Results.push_back(ND); 1795 } 1796 } 1797 1798 DeclContext *DeclContext::getRedeclContext() { 1799 DeclContext *Ctx = this; 1800 1801 // In C, a record type is the redeclaration context for its fields only. If 1802 // we arrive at a record context after skipping anything else, we should skip 1803 // the record as well. Currently, this means skipping enumerations because 1804 // they're the only transparent context that can exist within a struct or 1805 // union. 1806 bool SkipRecords = getDeclKind() == Decl::Kind::Enum && 1807 !getParentASTContext().getLangOpts().CPlusPlus; 1808 1809 // Skip through contexts to get to the redeclaration context. Transparent 1810 // contexts are always skipped. 1811 while ((SkipRecords && Ctx->isRecord()) || Ctx->isTransparentContext()) 1812 Ctx = Ctx->getParent(); 1813 return Ctx; 1814 } 1815 1816 DeclContext *DeclContext::getEnclosingNamespaceContext() { 1817 DeclContext *Ctx = this; 1818 // Skip through non-namespace, non-translation-unit contexts. 1819 while (!Ctx->isFileContext()) 1820 Ctx = Ctx->getParent(); 1821 return Ctx->getPrimaryContext(); 1822 } 1823 1824 RecordDecl *DeclContext::getOuterLexicalRecordContext() { 1825 // Loop until we find a non-record context. 1826 RecordDecl *OutermostRD = nullptr; 1827 DeclContext *DC = this; 1828 while (DC->isRecord()) { 1829 OutermostRD = cast<RecordDecl>(DC); 1830 DC = DC->getLexicalParent(); 1831 } 1832 return OutermostRD; 1833 } 1834 1835 bool DeclContext::InEnclosingNamespaceSetOf(const DeclContext *O) const { 1836 // For non-file contexts, this is equivalent to Equals. 1837 if (!isFileContext()) 1838 return O->Equals(this); 1839 1840 do { 1841 if (O->Equals(this)) 1842 return true; 1843 1844 const auto *NS = dyn_cast<NamespaceDecl>(O); 1845 if (!NS || !NS->isInline()) 1846 break; 1847 O = NS->getParent(); 1848 } while (O); 1849 1850 return false; 1851 } 1852 1853 void DeclContext::makeDeclVisibleInContext(NamedDecl *D) { 1854 DeclContext *PrimaryDC = this->getPrimaryContext(); 1855 DeclContext *DeclDC = D->getDeclContext()->getPrimaryContext(); 1856 // If the decl is being added outside of its semantic decl context, we 1857 // need to ensure that we eagerly build the lookup information for it. 1858 PrimaryDC->makeDeclVisibleInContextWithFlags(D, false, PrimaryDC == DeclDC); 1859 } 1860 1861 void DeclContext::makeDeclVisibleInContextWithFlags(NamedDecl *D, bool Internal, 1862 bool Recoverable) { 1863 assert(this == getPrimaryContext() && "expected a primary DC"); 1864 1865 if (!isLookupContext()) { 1866 if (isTransparentContext()) 1867 getParent()->getPrimaryContext() 1868 ->makeDeclVisibleInContextWithFlags(D, Internal, Recoverable); 1869 return; 1870 } 1871 1872 // Skip declarations which should be invisible to name lookup. 1873 if (shouldBeHidden(D)) 1874 return; 1875 1876 // If we already have a lookup data structure, perform the insertion into 1877 // it. If we might have externally-stored decls with this name, look them 1878 // up and perform the insertion. If this decl was declared outside its 1879 // semantic context, buildLookup won't add it, so add it now. 1880 // 1881 // FIXME: As a performance hack, don't add such decls into the translation 1882 // unit unless we're in C++, since qualified lookup into the TU is never 1883 // performed. 1884 if (LookupPtr || hasExternalVisibleStorage() || 1885 ((!Recoverable || D->getDeclContext() != D->getLexicalDeclContext()) && 1886 (getParentASTContext().getLangOpts().CPlusPlus || 1887 !isTranslationUnit()))) { 1888 // If we have lazily omitted any decls, they might have the same name as 1889 // the decl which we are adding, so build a full lookup table before adding 1890 // this decl. 1891 buildLookup(); 1892 makeDeclVisibleInContextImpl(D, Internal); 1893 } else { 1894 setHasLazyLocalLexicalLookups(true); 1895 } 1896 1897 // If we are a transparent context or inline namespace, insert into our 1898 // parent context, too. This operation is recursive. 1899 if (isTransparentContext() || isInlineNamespace()) 1900 getParent()->getPrimaryContext()-> 1901 makeDeclVisibleInContextWithFlags(D, Internal, Recoverable); 1902 1903 auto *DCAsDecl = cast<Decl>(this); 1904 // Notify that a decl was made visible unless we are a Tag being defined. 1905 if (!(isa<TagDecl>(DCAsDecl) && cast<TagDecl>(DCAsDecl)->isBeingDefined())) 1906 if (ASTMutationListener *L = DCAsDecl->getASTMutationListener()) 1907 L->AddedVisibleDecl(this, D); 1908 } 1909 1910 void DeclContext::makeDeclVisibleInContextImpl(NamedDecl *D, bool Internal) { 1911 // Find or create the stored declaration map. 1912 StoredDeclsMap *Map = LookupPtr; 1913 if (!Map) { 1914 ASTContext *C = &getParentASTContext(); 1915 Map = CreateStoredDeclsMap(*C); 1916 } 1917 1918 // If there is an external AST source, load any declarations it knows about 1919 // with this declaration's name. 1920 // If the lookup table contains an entry about this name it means that we 1921 // have already checked the external source. 1922 if (!Internal) 1923 if (ExternalASTSource *Source = getParentASTContext().getExternalSource()) 1924 if (hasExternalVisibleStorage() && 1925 Map->find(D->getDeclName()) == Map->end()) 1926 Source->FindExternalVisibleDeclsByName(this, D->getDeclName()); 1927 1928 // Insert this declaration into the map. 1929 StoredDeclsList &DeclNameEntries = (*Map)[D->getDeclName()]; 1930 1931 if (Internal) { 1932 // If this is being added as part of loading an external declaration, 1933 // this may not be the only external declaration with this name. 1934 // In this case, we never try to replace an existing declaration; we'll 1935 // handle that when we finalize the list of declarations for this name. 1936 DeclNameEntries.setHasExternalDecls(); 1937 DeclNameEntries.prependDeclNoReplace(D); 1938 return; 1939 } 1940 1941 DeclNameEntries.addOrReplaceDecl(D); 1942 } 1943 1944 UsingDirectiveDecl *DeclContext::udir_iterator::operator*() const { 1945 return cast<UsingDirectiveDecl>(*I); 1946 } 1947 1948 /// Returns iterator range [First, Last) of UsingDirectiveDecls stored within 1949 /// this context. 1950 DeclContext::udir_range DeclContext::using_directives() const { 1951 // FIXME: Use something more efficient than normal lookup for using 1952 // directives. In C++, using directives are looked up more than anything else. 1953 lookup_result Result = lookup(UsingDirectiveDecl::getName()); 1954 return udir_range(Result.begin(), Result.end()); 1955 } 1956 1957 //===----------------------------------------------------------------------===// 1958 // Creation and Destruction of StoredDeclsMaps. // 1959 //===----------------------------------------------------------------------===// 1960 1961 StoredDeclsMap *DeclContext::CreateStoredDeclsMap(ASTContext &C) const { 1962 assert(!LookupPtr && "context already has a decls map"); 1963 assert(getPrimaryContext() == this && 1964 "creating decls map on non-primary context"); 1965 1966 StoredDeclsMap *M; 1967 bool Dependent = isDependentContext(); 1968 if (Dependent) 1969 M = new DependentStoredDeclsMap(); 1970 else 1971 M = new StoredDeclsMap(); 1972 M->Previous = C.LastSDM; 1973 C.LastSDM = llvm::PointerIntPair<StoredDeclsMap*,1>(M, Dependent); 1974 LookupPtr = M; 1975 return M; 1976 } 1977 1978 void ASTContext::ReleaseDeclContextMaps() { 1979 // It's okay to delete DependentStoredDeclsMaps via a StoredDeclsMap 1980 // pointer because the subclass doesn't add anything that needs to 1981 // be deleted. 1982 StoredDeclsMap::DestroyAll(LastSDM.getPointer(), LastSDM.getInt()); 1983 LastSDM.setPointer(nullptr); 1984 } 1985 1986 void StoredDeclsMap::DestroyAll(StoredDeclsMap *Map, bool Dependent) { 1987 while (Map) { 1988 // Advance the iteration before we invalidate memory. 1989 llvm::PointerIntPair<StoredDeclsMap*,1> Next = Map->Previous; 1990 1991 if (Dependent) 1992 delete static_cast<DependentStoredDeclsMap*>(Map); 1993 else 1994 delete Map; 1995 1996 Map = Next.getPointer(); 1997 Dependent = Next.getInt(); 1998 } 1999 } 2000 2001 DependentDiagnostic *DependentDiagnostic::Create(ASTContext &C, 2002 DeclContext *Parent, 2003 const PartialDiagnostic &PDiag) { 2004 assert(Parent->isDependentContext() 2005 && "cannot iterate dependent diagnostics of non-dependent context"); 2006 Parent = Parent->getPrimaryContext(); 2007 if (!Parent->LookupPtr) 2008 Parent->CreateStoredDeclsMap(C); 2009 2010 auto *Map = static_cast<DependentStoredDeclsMap *>(Parent->LookupPtr); 2011 2012 // Allocate the copy of the PartialDiagnostic via the ASTContext's 2013 // BumpPtrAllocator, rather than the ASTContext itself. 2014 DiagnosticStorage *DiagStorage = nullptr; 2015 if (PDiag.hasStorage()) 2016 DiagStorage = new (C) DiagnosticStorage; 2017 2018 auto *DD = new (C) DependentDiagnostic(PDiag, DiagStorage); 2019 2020 // TODO: Maybe we shouldn't reverse the order during insertion. 2021 DD->NextDiagnostic = Map->FirstDiagnostic; 2022 Map->FirstDiagnostic = DD; 2023 2024 return DD; 2025 } 2026