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 53using 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 63void 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 73void *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 93void *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 114Module *Decl::getOwningModuleSlow() const { 115 assert(isFromASTFile() && "Not from AST file?"); 116 return getASTContext().getExternalSource()->getModule(getOwningModuleID()); 117} 118 119bool Decl::hasLocalOwningModuleStorage() const { 120 return getASTContext().getLangOpts().trackLocalOwningModule(); 121} 122 123const 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 132void 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 155const 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 164bool Decl::StatisticsEnabled = false; 165void Decl::EnableStatistics() { 166 StatisticsEnabled = true; 167} 168 169void 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 193void 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 201bool 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 211bool Decl::isParameterPack() const { 212 if (const auto *Var = dyn_cast<VarDecl>(this)) 213 return Var->isParameterPack(); 214 215 return isTemplateParameterPack(); 216} 217 218FunctionDecl *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 226bool Decl::isTemplateDecl() const { 227 return isa<TemplateDecl>(this); 228} 229 230TemplateDecl *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 243const 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 253bool 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 265unsigned 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 286const DeclContext *Decl::getParentFunctionOrMethod() const { 287 for (const DeclContext *DC = getDeclContext(); 288 DC && !DC->isTranslationUnit() && !DC->isNamespace(); 289 DC = DC->getParent()) 290 if (DC->isFunctionOrMethod()) 291 return DC; 292 293 return nullptr; 294} 295 296//===----------------------------------------------------------------------===// 297// PrettyStackTraceDecl Implementation 298//===----------------------------------------------------------------------===// 299 300void PrettyStackTraceDecl::print(raw_ostream &OS) const { 301 SourceLocation TheLoc = Loc; 302 if (TheLoc.isInvalid() && TheDecl) 303 TheLoc = TheDecl->getLocation(); 304 305 if (TheLoc.isValid()) { 306 TheLoc.print(OS, SM); 307 OS << ": "; 308 } 309 310 OS << Message; 311 312 if (const auto *DN = dyn_cast_or_null<NamedDecl>(TheDecl)) { 313 OS << " '"; 314 DN->printQualifiedName(OS); 315 OS << '\''; 316 } 317 OS << '\n'; 318} 319 320//===----------------------------------------------------------------------===// 321// Decl Implementation 322//===----------------------------------------------------------------------===// 323 324// Out-of-line virtual method providing a home for Decl. 325Decl::~Decl() = default; 326 327void Decl::setDeclContext(DeclContext *DC) { 328 DeclCtx = DC; 329} 330 331void Decl::setLexicalDeclContext(DeclContext *DC) { 332 if (DC == getLexicalDeclContext()) 333 return; 334 335 if (isInSemaDC()) { 336 setDeclContextsImpl(getDeclContext(), DC, getASTContext()); 337 } else { 338 getMultipleDC()->LexicalDC = DC; 339 } 340 341 // FIXME: We shouldn't be changing the lexical context of declarations 342 // imported from AST files. 343 if (!isFromASTFile()) { 344 setModuleOwnershipKind(getModuleOwnershipKindForChildOf(DC)); 345 if (hasOwningModule()) 346 setLocalOwningModule(cast<Decl>(DC)->getOwningModule()); 347 } 348 349 assert( 350 (getModuleOwnershipKind() != ModuleOwnershipKind::VisibleWhenImported || 351 getOwningModule()) && 352 "hidden declaration has no owning module"); 353} 354 355void Decl::setDeclContextsImpl(DeclContext *SemaDC, DeclContext *LexicalDC, 356 ASTContext &Ctx) { 357 if (SemaDC == LexicalDC) { 358 DeclCtx = SemaDC; 359 } else { 360 auto *MDC = new (Ctx) Decl::MultipleDC(); 361 MDC->SemanticDC = SemaDC; 362 MDC->LexicalDC = LexicalDC; 363 DeclCtx = MDC; 364 } 365} 366 367bool Decl::isInLocalScopeForInstantiation() const { 368 const DeclContext *LDC = getLexicalDeclContext(); 369 if (!LDC->isDependentContext()) 370 return false; 371 while (true) { 372 if (LDC->isFunctionOrMethod()) 373 return true; 374 if (!isa<TagDecl>(LDC)) 375 return false; 376 if (const auto *CRD = dyn_cast<CXXRecordDecl>(LDC)) 377 if (CRD->isLambda()) 378 return true; 379 LDC = LDC->getLexicalParent(); 380 } 381 return false; 382} 383 384bool Decl::isInAnonymousNamespace() const { 385 for (const DeclContext *DC = getDeclContext(); DC; DC = DC->getParent()) { 386 if (const auto *ND = dyn_cast<NamespaceDecl>(DC)) 387 if (ND->isAnonymousNamespace()) 388 return true; 389 } 390 391 return false; 392} 393 394bool Decl::isInStdNamespace() const { 395 const DeclContext *DC = getDeclContext(); 396 return DC && DC->isStdNamespace(); 397} 398 399TranslationUnitDecl *Decl::getTranslationUnitDecl() { 400 if (auto *TUD = dyn_cast<TranslationUnitDecl>(this)) 401 return TUD; 402 403 DeclContext *DC = getDeclContext(); 404 assert(DC && "This decl is not contained in a translation unit!"); 405 406 while (!DC->isTranslationUnit()) { 407 DC = DC->getParent(); 408 assert(DC && "This decl is not contained in a translation unit!"); 409 } 410 411 return cast<TranslationUnitDecl>(DC); 412} 413 414ASTContext &Decl::getASTContext() const { 415 return getTranslationUnitDecl()->getASTContext(); 416} 417 418/// Helper to get the language options from the ASTContext. 419/// Defined out of line to avoid depending on ASTContext.h. 420const LangOptions &Decl::getLangOpts() const { 421 return getASTContext().getLangOpts(); 422} 423 424ASTMutationListener *Decl::getASTMutationListener() const { 425 return getASTContext().getASTMutationListener(); 426} 427 428unsigned Decl::getMaxAlignment() const { 429 if (!hasAttrs()) 430 return 0; 431 432 unsigned Align = 0; 433 const AttrVec &V = getAttrs(); 434 ASTContext &Ctx = getASTContext(); 435 specific_attr_iterator<AlignedAttr> I(V.begin()), E(V.end()); 436 for (; I != E; ++I) { 437 if (!I->isAlignmentErrorDependent()) 438 Align = std::max(Align, I->getAlignment(Ctx)); 439 } 440 return Align; 441} 442 443bool Decl::isUsed(bool CheckUsedAttr) const { 444 const Decl *CanonD = getCanonicalDecl(); 445 if (CanonD->Used) 446 return true; 447 448 // Check for used attribute. 449 // Ask the most recent decl, since attributes accumulate in the redecl chain. 450 if (CheckUsedAttr && getMostRecentDecl()->hasAttr<UsedAttr>()) 451 return true; 452 453 // The information may have not been deserialized yet. Force deserialization 454 // to complete the needed information. 455 return getMostRecentDecl()->getCanonicalDecl()->Used; 456} 457 458void Decl::markUsed(ASTContext &C) { 459 if (isUsed(false)) 460 return; 461 462 if (C.getASTMutationListener()) 463 C.getASTMutationListener()->DeclarationMarkedUsed(this); 464 465 setIsUsed(); 466} 467 468bool Decl::isReferenced() const { 469 if (Referenced) 470 return true; 471 472 // Check redeclarations. 473 for (const auto *I : redecls()) 474 if (I->Referenced) 475 return true; 476 477 return false; 478} 479 480ExternalSourceSymbolAttr *Decl::getExternalSourceSymbolAttr() const { 481 const Decl *Definition = nullptr; 482 if (auto *ID = dyn_cast<ObjCInterfaceDecl>(this)) { 483 Definition = ID->getDefinition(); 484 } else if (auto *PD = dyn_cast<ObjCProtocolDecl>(this)) { 485 Definition = PD->getDefinition(); 486 } else if (auto *TD = dyn_cast<TagDecl>(this)) { 487 Definition = TD->getDefinition(); 488 } 489 if (!Definition) 490 Definition = this; 491 492 if (auto *attr = Definition->getAttr<ExternalSourceSymbolAttr>()) 493 return attr; 494 if (auto *dcd = dyn_cast<Decl>(getDeclContext())) { 495 return dcd->getAttr<ExternalSourceSymbolAttr>(); 496 } 497 498 return nullptr; 499} 500 501bool Decl::hasDefiningAttr() const { 502 return hasAttr<AliasAttr>() || hasAttr<IFuncAttr>() || 503 hasAttr<LoaderUninitializedAttr>(); 504} 505 506const Attr *Decl::getDefiningAttr() const { 507 if (auto *AA = getAttr<AliasAttr>()) 508 return AA; 509 if (auto *IFA = getAttr<IFuncAttr>()) 510 return IFA; 511 if (auto *NZA = getAttr<LoaderUninitializedAttr>()) 512 return NZA; 513 return nullptr; 514} 515 516static StringRef getRealizedPlatform(const AvailabilityAttr *A, 517 const ASTContext &Context) { 518 // Check if this is an App Extension "platform", and if so chop off 519 // the suffix for matching with the actual platform. 520 StringRef RealizedPlatform = A->getPlatform()->getName(); 521 if (!Context.getLangOpts().AppExt) 522 return RealizedPlatform; 523 size_t suffix = RealizedPlatform.rfind("_app_extension"); 524 if (suffix != StringRef::npos) 525 return RealizedPlatform.slice(0, suffix); 526 return RealizedPlatform; 527} 528 529/// Determine the availability of the given declaration based on 530/// the target platform. 531/// 532/// When it returns an availability result other than \c AR_Available, 533/// if the \p Message parameter is non-NULL, it will be set to a 534/// string describing why the entity is unavailable. 535/// 536/// FIXME: Make these strings localizable, since they end up in 537/// diagnostics. 538static AvailabilityResult CheckAvailability(ASTContext &Context, 539 const AvailabilityAttr *A, 540 std::string *Message, 541 VersionTuple EnclosingVersion) { 542 if (EnclosingVersion.empty()) 543 EnclosingVersion = Context.getTargetInfo().getPlatformMinVersion(); 544 545 if (EnclosingVersion.empty()) 546 return AR_Available; 547 548 StringRef ActualPlatform = A->getPlatform()->getName(); 549 StringRef TargetPlatform = Context.getTargetInfo().getPlatformName(); 550 551 // Match the platform name. 552 if (getRealizedPlatform(A, Context) != TargetPlatform) 553 return AR_Available; 554 555 StringRef PrettyPlatformName 556 = AvailabilityAttr::getPrettyPlatformName(ActualPlatform); 557 558 if (PrettyPlatformName.empty()) 559 PrettyPlatformName = ActualPlatform; 560 561 std::string HintMessage; 562 if (!A->getMessage().empty()) { 563 HintMessage = " - "; 564 HintMessage += A->getMessage(); 565 } 566 567 // Make sure that this declaration has not been marked 'unavailable'. 568 if (A->getUnavailable()) { 569 if (Message) { 570 Message->clear(); 571 llvm::raw_string_ostream Out(*Message); 572 Out << "not available on " << PrettyPlatformName 573 << HintMessage; 574 } 575 576 return AR_Unavailable; 577 } 578 579 // Make sure that this declaration has already been introduced. 580 if (!A->getIntroduced().empty() && 581 EnclosingVersion < A->getIntroduced()) { 582 if (Message) { 583 Message->clear(); 584 llvm::raw_string_ostream Out(*Message); 585 VersionTuple VTI(A->getIntroduced()); 586 Out << "introduced in " << PrettyPlatformName << ' ' 587 << VTI << HintMessage; 588 } 589 590 return A->getStrict() ? AR_Unavailable : AR_NotYetIntroduced; 591 } 592 593 // Make sure that this declaration hasn't been obsoleted. 594 if (!A->getObsoleted().empty() && EnclosingVersion >= A->getObsoleted()) { 595 if (Message) { 596 Message->clear(); 597 llvm::raw_string_ostream Out(*Message); 598 VersionTuple VTO(A->getObsoleted()); 599 Out << "obsoleted in " << PrettyPlatformName << ' ' 600 << VTO << HintMessage; 601 } 602 603 return AR_Unavailable; 604 } 605 606 // Make sure that this declaration hasn't been deprecated. 607 if (!A->getDeprecated().empty() && EnclosingVersion >= A->getDeprecated()) { 608 if (Message) { 609 Message->clear(); 610 llvm::raw_string_ostream Out(*Message); 611 VersionTuple VTD(A->getDeprecated()); 612 Out << "first deprecated in " << PrettyPlatformName << ' ' 613 << VTD << HintMessage; 614 } 615 616 return AR_Deprecated; 617 } 618 619 return AR_Available; 620} 621 622AvailabilityResult Decl::getAvailability(std::string *Message, 623 VersionTuple EnclosingVersion, 624 StringRef *RealizedPlatform) const { 625 if (auto *FTD = dyn_cast<FunctionTemplateDecl>(this)) 626 return FTD->getTemplatedDecl()->getAvailability(Message, EnclosingVersion, 627 RealizedPlatform); 628 629 AvailabilityResult Result = AR_Available; 630 std::string ResultMessage; 631 632 for (const auto *A : attrs()) { 633 if (const auto *Deprecated = dyn_cast<DeprecatedAttr>(A)) { 634 if (Result >= AR_Deprecated) 635 continue; 636 637 if (Message) 638 ResultMessage = std::string(Deprecated->getMessage()); 639 640 Result = AR_Deprecated; 641 continue; 642 } 643 644 if (const auto *Unavailable = dyn_cast<UnavailableAttr>(A)) { 645 if (Message) 646 *Message = std::string(Unavailable->getMessage()); 647 return AR_Unavailable; 648 } 649 650 if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) { 651 AvailabilityResult AR = CheckAvailability(getASTContext(), Availability, 652 Message, EnclosingVersion); 653 654 if (AR == AR_Unavailable) { 655 if (RealizedPlatform) 656 *RealizedPlatform = Availability->getPlatform()->getName(); 657 return AR_Unavailable; 658 } 659 660 if (AR > Result) { 661 Result = AR; 662 if (Message) 663 ResultMessage.swap(*Message); 664 } 665 continue; 666 } 667 } 668 669 if (Message) 670 Message->swap(ResultMessage); 671 return Result; 672} 673 674VersionTuple Decl::getVersionIntroduced() const { 675 const ASTContext &Context = getASTContext(); 676 StringRef TargetPlatform = Context.getTargetInfo().getPlatformName(); 677 for (const auto *A : attrs()) { 678 if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) { 679 if (getRealizedPlatform(Availability, Context) != TargetPlatform) 680 continue; 681 if (!Availability->getIntroduced().empty()) 682 return Availability->getIntroduced(); 683 } 684 } 685 return {}; 686} 687 688bool Decl::canBeWeakImported(bool &IsDefinition) const { 689 IsDefinition = false; 690 691 // Variables, if they aren't definitions. 692 if (const auto *Var = dyn_cast<VarDecl>(this)) { 693 if (Var->isThisDeclarationADefinition()) { 694 IsDefinition = true; 695 return false; 696 } 697 return true; 698 } 699 // Functions, if they aren't definitions. 700 if (const auto *FD = dyn_cast<FunctionDecl>(this)) { 701 if (FD->hasBody()) { 702 IsDefinition = true; 703 return false; 704 } 705 return true; 706 707 } 708 // Objective-C classes, if this is the non-fragile runtime. 709 if (isa<ObjCInterfaceDecl>(this) && 710 getASTContext().getLangOpts().ObjCRuntime.hasWeakClassImport()) { 711 return true; 712 } 713 // Nothing else. 714 return false; 715} 716 717bool Decl::isWeakImported() const { 718 bool IsDefinition; 719 if (!canBeWeakImported(IsDefinition)) 720 return false; 721 722 for (const auto *A : getMostRecentDecl()->attrs()) { 723 if (isa<WeakImportAttr>(A)) 724 return true; 725 726 if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) { 727 if (CheckAvailability(getASTContext(), Availability, nullptr, 728 VersionTuple()) == AR_NotYetIntroduced) 729 return true; 730 } 731 } 732 733 return false; 734} 735 736unsigned Decl::getIdentifierNamespaceForKind(Kind DeclKind) { 737 switch (DeclKind) { 738 case Function: 739 case CXXDeductionGuide: 740 case CXXMethod: 741 case CXXConstructor: 742 case ConstructorUsingShadow: 743 case CXXDestructor: 744 case CXXConversion: 745 case EnumConstant: 746 case Var: 747 case ImplicitParam: 748 case ParmVar: 749 case ObjCMethod: 750 case ObjCProperty: 751 case MSProperty: 752 return IDNS_Ordinary; 753 case Label: 754 return IDNS_Label; 755 case IndirectField: 756 return IDNS_Ordinary | IDNS_Member; 757 758 case Binding: 759 case NonTypeTemplateParm: 760 case VarTemplate: 761 case Concept: 762 // These (C++-only) declarations are found by redeclaration lookup for 763 // tag types, so we include them in the tag namespace. 764 return IDNS_Ordinary | IDNS_Tag; 765 766 case ObjCCompatibleAlias: 767 case ObjCInterface: 768 return IDNS_Ordinary | IDNS_Type; 769 770 case Typedef: 771 case TypeAlias: 772 case TemplateTypeParm: 773 case ObjCTypeParam: 774 return IDNS_Ordinary | IDNS_Type; 775 776 case UnresolvedUsingTypename: 777 return IDNS_Ordinary | IDNS_Type | IDNS_Using; 778 779 case UsingShadow: 780 return 0; // we'll actually overwrite this later 781 782 case UnresolvedUsingValue: 783 return IDNS_Ordinary | IDNS_Using; 784 785 case Using: 786 case UsingPack: 787 return IDNS_Using; 788 789 case ObjCProtocol: 790 return IDNS_ObjCProtocol; 791 792 case Field: 793 case ObjCAtDefsField: 794 case ObjCIvar: 795 return IDNS_Member; 796 797 case Record: 798 case CXXRecord: 799 case Enum: 800 return IDNS_Tag | IDNS_Type; 801 802 case Namespace: 803 case NamespaceAlias: 804 return IDNS_Namespace; 805 806 case FunctionTemplate: 807 return IDNS_Ordinary; 808 809 case ClassTemplate: 810 case TemplateTemplateParm: 811 case TypeAliasTemplate: 812 return IDNS_Ordinary | IDNS_Tag | IDNS_Type; 813 814 case OMPDeclareReduction: 815 return IDNS_OMPReduction; 816 817 case OMPDeclareMapper: 818 return IDNS_OMPMapper; 819 820 // Never have names. 821 case Friend: 822 case FriendTemplate: 823 case AccessSpec: 824 case LinkageSpec: 825 case Export: 826 case FileScopeAsm: 827 case StaticAssert: 828 case ObjCPropertyImpl: 829 case PragmaComment: 830 case PragmaDetectMismatch: 831 case Block: 832 case Captured: 833 case TranslationUnit: 834 case ExternCContext: 835 case Decomposition: 836 case MSGuid: 837 case TemplateParamObject: 838 839 case UsingDirective: 840 case BuiltinTemplate: 841 case ClassTemplateSpecialization: 842 case ClassTemplatePartialSpecialization: 843 case ClassScopeFunctionSpecialization: 844 case VarTemplateSpecialization: 845 case VarTemplatePartialSpecialization: 846 case ObjCImplementation: 847 case ObjCCategory: 848 case ObjCCategoryImpl: 849 case Import: 850 case OMPThreadPrivate: 851 case OMPAllocate: 852 case OMPRequires: 853 case OMPCapturedExpr: 854 case Empty: 855 case LifetimeExtendedTemporary: 856 case RequiresExprBody: 857 // Never looked up by name. 858 return 0; 859 } 860 861 llvm_unreachable("Invalid DeclKind!"); 862} 863 864void Decl::setAttrsImpl(const AttrVec &attrs, ASTContext &Ctx) { 865 assert(!HasAttrs && "Decl already contains attrs."); 866 867 AttrVec &AttrBlank = Ctx.getDeclAttrs(this); 868 assert(AttrBlank.empty() && "HasAttrs was wrong?"); 869 870 AttrBlank = attrs; 871 HasAttrs = true; 872} 873 874void Decl::dropAttrs() { 875 if (!HasAttrs) return; 876 877 HasAttrs = false; 878 getASTContext().eraseDeclAttrs(this); 879} 880 881void Decl::addAttr(Attr *A) { 882 if (!hasAttrs()) { 883 setAttrs(AttrVec(1, A)); 884 return; 885 } 886 887 AttrVec &Attrs = getAttrs(); 888 if (!A->isInherited()) { 889 Attrs.push_back(A); 890 return; 891 } 892 893 // Attribute inheritance is processed after attribute parsing. To keep the 894 // order as in the source code, add inherited attributes before non-inherited 895 // ones. 896 auto I = Attrs.begin(), E = Attrs.end(); 897 for (; I != E; ++I) { 898 if (!(*I)->isInherited()) 899 break; 900 } 901 Attrs.insert(I, A); 902} 903 904const AttrVec &Decl::getAttrs() const { 905 assert(HasAttrs && "No attrs to get!"); 906 return getASTContext().getDeclAttrs(this); 907} 908 909Decl *Decl::castFromDeclContext (const DeclContext *D) { 910 Decl::Kind DK = D->getDeclKind(); 911 switch(DK) { 912#define DECL(NAME, BASE) 913#define DECL_CONTEXT(NAME) \ 914 case Decl::NAME: \ 915 return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D)); 916#define DECL_CONTEXT_BASE(NAME) 917#include "clang/AST/DeclNodes.inc" 918 default: 919#define DECL(NAME, BASE) 920#define DECL_CONTEXT_BASE(NAME) \ 921 if (DK >= first##NAME && DK <= last##NAME) \ 922 return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D)); 923#include "clang/AST/DeclNodes.inc" 924 llvm_unreachable("a decl that inherits DeclContext isn't handled"); 925 } 926} 927 928DeclContext *Decl::castToDeclContext(const Decl *D) { 929 Decl::Kind DK = D->getKind(); 930 switch(DK) { 931#define DECL(NAME, BASE) 932#define DECL_CONTEXT(NAME) \ 933 case Decl::NAME: \ 934 return static_cast<NAME##Decl *>(const_cast<Decl *>(D)); 935#define DECL_CONTEXT_BASE(NAME) 936#include "clang/AST/DeclNodes.inc" 937 default: 938#define DECL(NAME, BASE) 939#define DECL_CONTEXT_BASE(NAME) \ 940 if (DK >= first##NAME && DK <= last##NAME) \ 941 return static_cast<NAME##Decl *>(const_cast<Decl *>(D)); 942#include "clang/AST/DeclNodes.inc" 943 llvm_unreachable("a decl that inherits DeclContext isn't handled"); 944 } 945} 946 947SourceLocation Decl::getBodyRBrace() const { 948 // Special handling of FunctionDecl to avoid de-serializing the body from PCH. 949 // FunctionDecl stores EndRangeLoc for this purpose. 950 if (const auto *FD = dyn_cast<FunctionDecl>(this)) { 951 const FunctionDecl *Definition; 952 if (FD->hasBody(Definition)) 953 return Definition->getSourceRange().getEnd(); 954 return {}; 955 } 956 957 if (Stmt *Body = getBody()) 958 return Body->getSourceRange().getEnd(); 959 960 return {}; 961} 962 963bool Decl::AccessDeclContextSanity() const { 964#ifndef NDEBUG 965 // Suppress this check if any of the following hold: 966 // 1. this is the translation unit (and thus has no parent) 967 // 2. this is a template parameter (and thus doesn't belong to its context) 968 // 3. this is a non-type template parameter 969 // 4. the context is not a record 970 // 5. it's invalid 971 // 6. it's a C++0x static_assert. 972 // 7. it's a block literal declaration 973 // 8. it's a temporary with lifetime extended due to being default value. 974 if (isa<TranslationUnitDecl>(this) || isa<TemplateTypeParmDecl>(this) || 975 isa<NonTypeTemplateParmDecl>(this) || !getDeclContext() || 976 !isa<CXXRecordDecl>(getDeclContext()) || isInvalidDecl() || 977 isa<StaticAssertDecl>(this) || isa<BlockDecl>(this) || 978 // FIXME: a ParmVarDecl can have ClassTemplateSpecialization 979 // as DeclContext (?). 980 isa<ParmVarDecl>(this) || 981 // FIXME: a ClassTemplateSpecialization or CXXRecordDecl can have 982 // AS_none as access specifier. 983 isa<CXXRecordDecl>(this) || 984 isa<ClassScopeFunctionSpecializationDecl>(this) || 985 isa<LifetimeExtendedTemporaryDecl>(this)) 986 return true; 987 988 assert(Access != AS_none && 989 "Access specifier is AS_none inside a record decl"); 990#endif 991 return true; 992} 993 994static Decl::Kind getKind(const Decl *D) { return D->getKind(); } 995static Decl::Kind getKind(const DeclContext *DC) { return DC->getDeclKind(); } 996 997int64_t Decl::getID() const { 998 return getASTContext().getAllocator().identifyKnownAlignedObject<Decl>(this); 999} 1000 1001const FunctionType *Decl::getFunctionType(bool BlocksToo) const { 1002 QualType Ty; 1003 if (const auto *D = dyn_cast<ValueDecl>(this)) 1004 Ty = D->getType(); 1005 else if (const auto *D = dyn_cast<TypedefNameDecl>(this)) 1006 Ty = D->getUnderlyingType(); 1007 else 1008 return nullptr; 1009 1010 if (Ty->isFunctionPointerType()) 1011 Ty = Ty->castAs<PointerType>()->getPointeeType(); 1012 else if (Ty->isFunctionReferenceType()) 1013 Ty = Ty->castAs<ReferenceType>()->getPointeeType(); 1014 else if (BlocksToo && Ty->isBlockPointerType()) 1015 Ty = Ty->castAs<BlockPointerType>()->getPointeeType(); 1016 1017 return Ty->getAs<FunctionType>(); 1018} 1019 1020/// Starting at a given context (a Decl or DeclContext), look for a 1021/// code context that is not a closure (a lambda, block, etc.). 1022template <class T> static Decl *getNonClosureContext(T *D) { 1023 if (getKind(D) == Decl::CXXMethod) { 1024 auto *MD = cast<CXXMethodDecl>(D); 1025 if (MD->getOverloadedOperator() == OO_Call && 1026 MD->getParent()->isLambda()) 1027 return getNonClosureContext(MD->getParent()->getParent()); 1028 return MD; 1029 } 1030 if (auto *FD = dyn_cast<FunctionDecl>(D)) 1031 return FD; 1032 if (auto *MD = dyn_cast<ObjCMethodDecl>(D)) 1033 return MD; 1034 if (auto *BD = dyn_cast<BlockDecl>(D)) 1035 return getNonClosureContext(BD->getParent()); 1036 if (auto *CD = dyn_cast<CapturedDecl>(D)) 1037 return getNonClosureContext(CD->getParent()); 1038 return nullptr; 1039} 1040 1041Decl *Decl::getNonClosureContext() { 1042 return ::getNonClosureContext(this); 1043} 1044 1045Decl *DeclContext::getNonClosureAncestor() { 1046 return ::getNonClosureContext(this); 1047} 1048 1049//===----------------------------------------------------------------------===// 1050// DeclContext Implementation 1051//===----------------------------------------------------------------------===// 1052 1053DeclContext::DeclContext(Decl::Kind K) { 1054 DeclContextBits.DeclKind = K; 1055 setHasExternalLexicalStorage(false); 1056 setHasExternalVisibleStorage(false); 1057 setNeedToReconcileExternalVisibleStorage(false); 1058 setHasLazyLocalLexicalLookups(false); 1059 setHasLazyExternalLexicalLookups(false); 1060 setUseQualifiedLookup(false); 1061} 1062 1063bool DeclContext::classof(const Decl *D) { 1064 switch (D->getKind()) { 1065#define DECL(NAME, BASE) 1066#define DECL_CONTEXT(NAME) case Decl::NAME: 1067#define DECL_CONTEXT_BASE(NAME) 1068#include "clang/AST/DeclNodes.inc" 1069 return true; 1070 default: 1071#define DECL(NAME, BASE) 1072#define DECL_CONTEXT_BASE(NAME) \ 1073 if (D->getKind() >= Decl::first##NAME && \ 1074 D->getKind() <= Decl::last##NAME) \ 1075 return true; 1076#include "clang/AST/DeclNodes.inc" 1077 return false; 1078 } 1079} 1080 1081DeclContext::~DeclContext() = default; 1082 1083/// Find the parent context of this context that will be 1084/// used for unqualified name lookup. 1085/// 1086/// Generally, the parent lookup context is the semantic context. However, for 1087/// a friend function the parent lookup context is the lexical context, which 1088/// is the class in which the friend is declared. 1089DeclContext *DeclContext::getLookupParent() { 1090 // FIXME: Find a better way to identify friends. 1091 if (isa<FunctionDecl>(this)) 1092 if (getParent()->getRedeclContext()->isFileContext() && 1093 getLexicalParent()->getRedeclContext()->isRecord()) 1094 return getLexicalParent(); 1095 1096 // A lookup within the call operator of a lambda never looks in the lambda 1097 // class; instead, skip to the context in which that closure type is 1098 // declared. 1099 if (isLambdaCallOperator(this)) 1100 return getParent()->getParent(); 1101 1102 return getParent(); 1103} 1104 1105const BlockDecl *DeclContext::getInnermostBlockDecl() const { 1106 const DeclContext *Ctx = this; 1107 1108 do { 1109 if (Ctx->isClosure()) 1110 return cast<BlockDecl>(Ctx); 1111 Ctx = Ctx->getParent(); 1112 } while (Ctx); 1113 1114 return nullptr; 1115} 1116 1117bool DeclContext::isInlineNamespace() const { 1118 return isNamespace() && 1119 cast<NamespaceDecl>(this)->isInline(); 1120} 1121 1122bool DeclContext::isStdNamespace() const { 1123 if (!isNamespace()) 1124 return false; 1125 1126 const auto *ND = cast<NamespaceDecl>(this); 1127 if (ND->isInline()) { 1128 return ND->getParent()->isStdNamespace(); 1129 } 1130 1131 if (!getParent()->getRedeclContext()->isTranslationUnit()) 1132 return false; 1133 1134 const IdentifierInfo *II = ND->getIdentifier(); 1135 return II && II->isStr("std"); 1136} 1137 1138bool DeclContext::isDependentContext() const { 1139 if (isFileContext()) 1140 return false; 1141 1142 if (isa<ClassTemplatePartialSpecializationDecl>(this)) 1143 return true; 1144 1145 if (const auto *Record = dyn_cast<CXXRecordDecl>(this)) { 1146 if (Record->getDescribedClassTemplate()) 1147 return true; 1148 1149 if (Record->isDependentLambda()) 1150 return true; 1151 } 1152 1153 if (const auto *Function = dyn_cast<FunctionDecl>(this)) { 1154 if (Function->getDescribedFunctionTemplate()) 1155 return true; 1156 1157 // Friend function declarations are dependent if their *lexical* 1158 // context is dependent. 1159 if (cast<Decl>(this)->getFriendObjectKind()) 1160 return getLexicalParent()->isDependentContext(); 1161 } 1162 1163 // FIXME: A variable template is a dependent context, but is not a 1164 // DeclContext. A context within it (such as a lambda-expression) 1165 // should be considered dependent. 1166 1167 return getParent() && getParent()->isDependentContext(); 1168} 1169 1170bool DeclContext::isTransparentContext() const { 1171 if (getDeclKind() == Decl::Enum) 1172 return !cast<EnumDecl>(this)->isScoped(); 1173 1174 return getDeclKind() == Decl::LinkageSpec || getDeclKind() == Decl::Export; 1175} 1176 1177static bool isLinkageSpecContext(const DeclContext *DC, 1178 LinkageSpecDecl::LanguageIDs ID) { 1179 while (DC->getDeclKind() != Decl::TranslationUnit) { 1180 if (DC->getDeclKind() == Decl::LinkageSpec) 1181 return cast<LinkageSpecDecl>(DC)->getLanguage() == ID; 1182 DC = DC->getLexicalParent(); 1183 } 1184 return false; 1185} 1186 1187bool DeclContext::isExternCContext() const { 1188 return isLinkageSpecContext(this, LinkageSpecDecl::lang_c); 1189} 1190 1191const LinkageSpecDecl *DeclContext::getExternCContext() const { 1192 const DeclContext *DC = this; 1193 while (DC->getDeclKind() != Decl::TranslationUnit) { 1194 if (DC->getDeclKind() == Decl::LinkageSpec && 1195 cast<LinkageSpecDecl>(DC)->getLanguage() == LinkageSpecDecl::lang_c) 1196 return cast<LinkageSpecDecl>(DC); 1197 DC = DC->getLexicalParent(); 1198 } 1199 return nullptr; 1200} 1201 1202bool DeclContext::isExternCXXContext() const { 1203 return isLinkageSpecContext(this, LinkageSpecDecl::lang_cxx); 1204} 1205 1206bool DeclContext::Encloses(const DeclContext *DC) const { 1207 if (getPrimaryContext() != this) 1208 return getPrimaryContext()->Encloses(DC); 1209 1210 for (; DC; DC = DC->getParent()) 1211 if (DC->getPrimaryContext() == this) 1212 return true; 1213 return false; 1214} 1215 1216DeclContext *DeclContext::getPrimaryContext() { 1217 switch (getDeclKind()) { 1218 case Decl::TranslationUnit: 1219 case Decl::ExternCContext: 1220 case Decl::LinkageSpec: 1221 case Decl::Export: 1222 case Decl::Block: 1223 case Decl::Captured: 1224 case Decl::OMPDeclareReduction: 1225 case Decl::OMPDeclareMapper: 1226 case Decl::RequiresExprBody: 1227 // There is only one DeclContext for these entities. 1228 return this; 1229 1230 case Decl::Namespace: 1231 // The original namespace is our primary context. 1232 return static_cast<NamespaceDecl *>(this)->getOriginalNamespace(); 1233 1234 case Decl::ObjCMethod: 1235 return this; 1236 1237 case Decl::ObjCInterface: 1238 if (auto *OID = dyn_cast<ObjCInterfaceDecl>(this)) 1239 if (auto *Def = OID->getDefinition()) 1240 return Def; 1241 return this; 1242 1243 case Decl::ObjCProtocol: 1244 if (auto *OPD = dyn_cast<ObjCProtocolDecl>(this)) 1245 if (auto *Def = OPD->getDefinition()) 1246 return Def; 1247 return this; 1248 1249 case Decl::ObjCCategory: 1250 return this; 1251 1252 case Decl::ObjCImplementation: 1253 case Decl::ObjCCategoryImpl: 1254 return this; 1255 1256 default: 1257 if (getDeclKind() >= Decl::firstTag && getDeclKind() <= Decl::lastTag) { 1258 // If this is a tag type that has a definition or is currently 1259 // being defined, that definition is our primary context. 1260 auto *Tag = cast<TagDecl>(this); 1261 1262 if (TagDecl *Def = Tag->getDefinition()) 1263 return Def; 1264 1265 if (const auto *TagTy = dyn_cast<TagType>(Tag->getTypeForDecl())) { 1266 // Note, TagType::getDecl returns the (partial) definition one exists. 1267 TagDecl *PossiblePartialDef = TagTy->getDecl(); 1268 if (PossiblePartialDef->isBeingDefined()) 1269 return PossiblePartialDef; 1270 } else { 1271 assert(isa<InjectedClassNameType>(Tag->getTypeForDecl())); 1272 } 1273 1274 return Tag; 1275 } 1276 1277 assert(getDeclKind() >= Decl::firstFunction && 1278 getDeclKind() <= Decl::lastFunction && 1279 "Unknown DeclContext kind"); 1280 return this; 1281 } 1282} 1283 1284void 1285DeclContext::collectAllContexts(SmallVectorImpl<DeclContext *> &Contexts){ 1286 Contexts.clear(); 1287 1288 if (getDeclKind() != Decl::Namespace) { 1289 Contexts.push_back(this); 1290 return; 1291 } 1292 1293 auto *Self = static_cast<NamespaceDecl *>(this); 1294 for (NamespaceDecl *N = Self->getMostRecentDecl(); N; 1295 N = N->getPreviousDecl()) 1296 Contexts.push_back(N); 1297 1298 std::reverse(Contexts.begin(), Contexts.end()); 1299} 1300 1301std::pair<Decl *, Decl *> 1302DeclContext::BuildDeclChain(ArrayRef<Decl *> Decls, 1303 bool FieldsAlreadyLoaded) { 1304 // Build up a chain of declarations via the Decl::NextInContextAndBits field. 1305 Decl *FirstNewDecl = nullptr; 1306 Decl *PrevDecl = nullptr; 1307 for (auto *D : Decls) { 1308 if (FieldsAlreadyLoaded && isa<FieldDecl>(D)) 1309 continue; 1310 1311 if (PrevDecl) 1312 PrevDecl->NextInContextAndBits.setPointer(D); 1313 else 1314 FirstNewDecl = D; 1315 1316 PrevDecl = D; 1317 } 1318 1319 return std::make_pair(FirstNewDecl, PrevDecl); 1320} 1321 1322/// We have just acquired external visible storage, and we already have 1323/// built a lookup map. For every name in the map, pull in the new names from 1324/// the external storage. 1325void DeclContext::reconcileExternalVisibleStorage() const { 1326 assert(hasNeedToReconcileExternalVisibleStorage() && LookupPtr); 1327 setNeedToReconcileExternalVisibleStorage(false); 1328 1329 for (auto &Lookup : *LookupPtr) 1330 Lookup.second.setHasExternalDecls(); 1331} 1332 1333/// Load the declarations within this lexical storage from an 1334/// external source. 1335/// \return \c true if any declarations were added. 1336bool 1337DeclContext::LoadLexicalDeclsFromExternalStorage() const { 1338 ExternalASTSource *Source = getParentASTContext().getExternalSource(); 1339 assert(hasExternalLexicalStorage() && Source && "No external storage?"); 1340 1341 // Notify that we have a DeclContext that is initializing. 1342 ExternalASTSource::Deserializing ADeclContext(Source); 1343 1344 // Load the external declarations, if any. 1345 SmallVector<Decl*, 64> Decls; 1346 setHasExternalLexicalStorage(false); 1347 Source->FindExternalLexicalDecls(this, Decls); 1348 1349 if (Decls.empty()) 1350 return false; 1351 1352 // We may have already loaded just the fields of this record, in which case 1353 // we need to ignore them. 1354 bool FieldsAlreadyLoaded = false; 1355 if (const auto *RD = dyn_cast<RecordDecl>(this)) 1356 FieldsAlreadyLoaded = RD->hasLoadedFieldsFromExternalStorage(); 1357 1358 // Splice the newly-read declarations into the beginning of the list 1359 // of declarations. 1360 Decl *ExternalFirst, *ExternalLast; 1361 std::tie(ExternalFirst, ExternalLast) = 1362 BuildDeclChain(Decls, FieldsAlreadyLoaded); 1363 ExternalLast->NextInContextAndBits.setPointer(FirstDecl); 1364 FirstDecl = ExternalFirst; 1365 if (!LastDecl) 1366 LastDecl = ExternalLast; 1367 return true; 1368} 1369 1370DeclContext::lookup_result 1371ExternalASTSource::SetNoExternalVisibleDeclsForName(const DeclContext *DC, 1372 DeclarationName Name) { 1373 ASTContext &Context = DC->getParentASTContext(); 1374 StoredDeclsMap *Map; 1375 if (!(Map = DC->LookupPtr)) 1376 Map = DC->CreateStoredDeclsMap(Context); 1377 if (DC->hasNeedToReconcileExternalVisibleStorage()) 1378 DC->reconcileExternalVisibleStorage(); 1379 1380 (*Map)[Name].removeExternalDecls(); 1381 1382 return DeclContext::lookup_result(); 1383} 1384 1385DeclContext::lookup_result 1386ExternalASTSource::SetExternalVisibleDeclsForName(const DeclContext *DC, 1387 DeclarationName Name, 1388 ArrayRef<NamedDecl*> Decls) { 1389 ASTContext &Context = DC->getParentASTContext(); 1390 StoredDeclsMap *Map; 1391 if (!(Map = DC->LookupPtr)) 1392 Map = DC->CreateStoredDeclsMap(Context); 1393 if (DC->hasNeedToReconcileExternalVisibleStorage()) 1394 DC->reconcileExternalVisibleStorage(); 1395 1396 StoredDeclsList &List = (*Map)[Name]; 1397 List.replaceExternalDecls(Decls); 1398 return List.getLookupResult(); 1399} 1400 1401DeclContext::decl_iterator DeclContext::decls_begin() const { 1402 if (hasExternalLexicalStorage()) 1403 LoadLexicalDeclsFromExternalStorage(); 1404 return decl_iterator(FirstDecl); 1405} 1406 1407bool DeclContext::decls_empty() const { 1408 if (hasExternalLexicalStorage()) 1409 LoadLexicalDeclsFromExternalStorage(); 1410 1411 return !FirstDecl; 1412} 1413 1414bool DeclContext::containsDecl(Decl *D) const { 1415 return (D->getLexicalDeclContext() == this && 1416 (D->NextInContextAndBits.getPointer() || D == LastDecl)); 1417} 1418 1419bool DeclContext::containsDeclAndLoad(Decl *D) const { 1420 if (hasExternalLexicalStorage()) 1421 LoadLexicalDeclsFromExternalStorage(); 1422 return containsDecl(D); 1423} 1424 1425/// shouldBeHidden - Determine whether a declaration which was declared 1426/// within its semantic context should be invisible to qualified name lookup. 1427static bool shouldBeHidden(NamedDecl *D) { 1428 // Skip unnamed declarations. 1429 if (!D->getDeclName()) 1430 return true; 1431 1432 // Skip entities that can't be found by name lookup into a particular 1433 // context. 1434 if ((D->getIdentifierNamespace() == 0 && !isa<UsingDirectiveDecl>(D)) || 1435 D->isTemplateParameter()) 1436 return true; 1437 1438 // Skip friends and local extern declarations unless they're the first 1439 // declaration of the entity. 1440 if ((D->isLocalExternDecl() || D->getFriendObjectKind()) && 1441 D != D->getCanonicalDecl()) 1442 return true; 1443 1444 // Skip template specializations. 1445 // FIXME: This feels like a hack. Should DeclarationName support 1446 // template-ids, or is there a better way to keep specializations 1447 // from being visible? 1448 if (isa<ClassTemplateSpecializationDecl>(D)) 1449 return true; 1450 if (auto *FD = dyn_cast<FunctionDecl>(D)) 1451 if (FD->isFunctionTemplateSpecialization()) 1452 return true; 1453 1454 // Hide destructors that are invalid. There should always be one destructor, 1455 // but if it is an invalid decl, another one is created. We need to hide the 1456 // invalid one from places that expect exactly one destructor, like the 1457 // serialization code. 1458 if (isa<CXXDestructorDecl>(D) && D->isInvalidDecl()) 1459 return true; 1460 1461 return false; 1462} 1463 1464void DeclContext::removeDecl(Decl *D) { 1465 assert(D->getLexicalDeclContext() == this && 1466 "decl being removed from non-lexical context"); 1467 assert((D->NextInContextAndBits.getPointer() || D == LastDecl) && 1468 "decl is not in decls list"); 1469 1470 // Remove D from the decl chain. This is O(n) but hopefully rare. 1471 if (D == FirstDecl) { 1472 if (D == LastDecl) 1473 FirstDecl = LastDecl = nullptr; 1474 else 1475 FirstDecl = D->NextInContextAndBits.getPointer(); 1476 } else { 1477 for (Decl *I = FirstDecl; true; I = I->NextInContextAndBits.getPointer()) { 1478 assert(I && "decl not found in linked list"); 1479 if (I->NextInContextAndBits.getPointer() == D) { 1480 I->NextInContextAndBits.setPointer(D->NextInContextAndBits.getPointer()); 1481 if (D == LastDecl) LastDecl = I; 1482 break; 1483 } 1484 } 1485 } 1486 1487 // Mark that D is no longer in the decl chain. 1488 D->NextInContextAndBits.setPointer(nullptr); 1489 1490 // Remove D from the lookup table if necessary. 1491 if (isa<NamedDecl>(D)) { 1492 auto *ND = cast<NamedDecl>(D); 1493 1494 // Do not try to remove the declaration if that is invisible to qualified 1495 // lookup. E.g. template specializations are skipped. 1496 if (shouldBeHidden(ND)) 1497 return; 1498 1499 // Remove only decls that have a name 1500 if (!ND->getDeclName()) 1501 return; 1502 1503 auto *DC = D->getDeclContext(); 1504 do { 1505 StoredDeclsMap *Map = DC->getPrimaryContext()->LookupPtr; 1506 if (Map) { 1507 StoredDeclsMap::iterator Pos = Map->find(ND->getDeclName()); 1508 assert(Pos != Map->end() && "no lookup entry for decl"); 1509 Pos->second.remove(ND); 1510 } 1511 } while (DC->isTransparentContext() && (DC = DC->getParent())); 1512 } 1513} 1514 1515void DeclContext::addHiddenDecl(Decl *D) { 1516 assert(D->getLexicalDeclContext() == this && 1517 "Decl inserted into wrong lexical context"); 1518 assert(!D->getNextDeclInContext() && D != LastDecl && 1519 "Decl already inserted into a DeclContext"); 1520 1521 if (FirstDecl) { 1522 LastDecl->NextInContextAndBits.setPointer(D); 1523 LastDecl = D; 1524 } else { 1525 FirstDecl = LastDecl = D; 1526 } 1527 1528 // Notify a C++ record declaration that we've added a member, so it can 1529 // update its class-specific state. 1530 if (auto *Record = dyn_cast<CXXRecordDecl>(this)) 1531 Record->addedMember(D); 1532 1533 // If this is a newly-created (not de-serialized) import declaration, wire 1534 // it in to the list of local import declarations. 1535 if (!D->isFromASTFile()) { 1536 if (auto *Import = dyn_cast<ImportDecl>(D)) 1537 D->getASTContext().addedLocalImportDecl(Import); 1538 } 1539} 1540 1541void DeclContext::addDecl(Decl *D) { 1542 addHiddenDecl(D); 1543 1544 if (auto *ND = dyn_cast<NamedDecl>(D)) 1545 ND->getDeclContext()->getPrimaryContext()-> 1546 makeDeclVisibleInContextWithFlags(ND, false, true); 1547} 1548 1549void DeclContext::addDeclInternal(Decl *D) { 1550 addHiddenDecl(D); 1551 1552 if (auto *ND = dyn_cast<NamedDecl>(D)) 1553 ND->getDeclContext()->getPrimaryContext()-> 1554 makeDeclVisibleInContextWithFlags(ND, true, true); 1555} 1556 1557/// buildLookup - Build the lookup data structure with all of the 1558/// declarations in this DeclContext (and any other contexts linked 1559/// to it or transparent contexts nested within it) and return it. 1560/// 1561/// Note that the produced map may miss out declarations from an 1562/// external source. If it does, those entries will be marked with 1563/// the 'hasExternalDecls' flag. 1564StoredDeclsMap *DeclContext::buildLookup() { 1565 assert(this == getPrimaryContext() && "buildLookup called on non-primary DC"); 1566 1567 if (!hasLazyLocalLexicalLookups() && 1568 !hasLazyExternalLexicalLookups()) 1569 return LookupPtr; 1570 1571 SmallVector<DeclContext *, 2> Contexts; 1572 collectAllContexts(Contexts); 1573 1574 if (hasLazyExternalLexicalLookups()) { 1575 setHasLazyExternalLexicalLookups(false); 1576 for (auto *DC : Contexts) { 1577 if (DC->hasExternalLexicalStorage()) { 1578 bool LoadedDecls = DC->LoadLexicalDeclsFromExternalStorage(); 1579 setHasLazyLocalLexicalLookups( 1580 hasLazyLocalLexicalLookups() | LoadedDecls ); 1581 } 1582 } 1583 1584 if (!hasLazyLocalLexicalLookups()) 1585 return LookupPtr; 1586 } 1587 1588 for (auto *DC : Contexts) 1589 buildLookupImpl(DC, hasExternalVisibleStorage()); 1590 1591 // We no longer have any lazy decls. 1592 setHasLazyLocalLexicalLookups(false); 1593 return LookupPtr; 1594} 1595 1596/// buildLookupImpl - Build part of the lookup data structure for the 1597/// declarations contained within DCtx, which will either be this 1598/// DeclContext, a DeclContext linked to it, or a transparent context 1599/// nested within it. 1600void DeclContext::buildLookupImpl(DeclContext *DCtx, bool Internal) { 1601 for (auto *D : DCtx->noload_decls()) { 1602 // Insert this declaration into the lookup structure, but only if 1603 // it's semantically within its decl context. Any other decls which 1604 // should be found in this context are added eagerly. 1605 // 1606 // If it's from an AST file, don't add it now. It'll get handled by 1607 // FindExternalVisibleDeclsByName if needed. Exception: if we're not 1608 // in C++, we do not track external visible decls for the TU, so in 1609 // that case we need to collect them all here. 1610 if (auto *ND = dyn_cast<NamedDecl>(D)) 1611 if (ND->getDeclContext() == DCtx && !shouldBeHidden(ND) && 1612 (!ND->isFromASTFile() || 1613 (isTranslationUnit() && 1614 !getParentASTContext().getLangOpts().CPlusPlus))) 1615 makeDeclVisibleInContextImpl(ND, Internal); 1616 1617 // If this declaration is itself a transparent declaration context 1618 // or inline namespace, add the members of this declaration of that 1619 // context (recursively). 1620 if (auto *InnerCtx = dyn_cast<DeclContext>(D)) 1621 if (InnerCtx->isTransparentContext() || InnerCtx->isInlineNamespace()) 1622 buildLookupImpl(InnerCtx, Internal); 1623 } 1624} 1625 1626DeclContext::lookup_result 1627DeclContext::lookup(DeclarationName Name) const { 1628 assert(getDeclKind() != Decl::LinkageSpec && 1629 getDeclKind() != Decl::Export && 1630 "should not perform lookups into transparent contexts"); 1631 1632 const DeclContext *PrimaryContext = getPrimaryContext(); 1633 if (PrimaryContext != this) 1634 return PrimaryContext->lookup(Name); 1635 1636 // If we have an external source, ensure that any later redeclarations of this 1637 // context have been loaded, since they may add names to the result of this 1638 // lookup (or add external visible storage). 1639 ExternalASTSource *Source = getParentASTContext().getExternalSource(); 1640 if (Source) 1641 (void)cast<Decl>(this)->getMostRecentDecl(); 1642 1643 if (hasExternalVisibleStorage()) { 1644 assert(Source && "external visible storage but no external source?"); 1645 1646 if (hasNeedToReconcileExternalVisibleStorage()) 1647 reconcileExternalVisibleStorage(); 1648 1649 StoredDeclsMap *Map = LookupPtr; 1650 1651 if (hasLazyLocalLexicalLookups() || 1652 hasLazyExternalLexicalLookups()) 1653 // FIXME: Make buildLookup const? 1654 Map = const_cast<DeclContext*>(this)->buildLookup(); 1655 1656 if (!Map) 1657 Map = CreateStoredDeclsMap(getParentASTContext()); 1658 1659 // If we have a lookup result with no external decls, we are done. 1660 std::pair<StoredDeclsMap::iterator, bool> R = 1661 Map->insert(std::make_pair(Name, StoredDeclsList())); 1662 if (!R.second && !R.first->second.hasExternalDecls()) 1663 return R.first->second.getLookupResult(); 1664 1665 if (Source->FindExternalVisibleDeclsByName(this, Name) || !R.second) { 1666 if (StoredDeclsMap *Map = LookupPtr) { 1667 StoredDeclsMap::iterator I = Map->find(Name); 1668 if (I != Map->end()) 1669 return I->second.getLookupResult(); 1670 } 1671 } 1672 1673 return {}; 1674 } 1675 1676 StoredDeclsMap *Map = LookupPtr; 1677 if (hasLazyLocalLexicalLookups() || 1678 hasLazyExternalLexicalLookups()) 1679 Map = const_cast<DeclContext*>(this)->buildLookup(); 1680 1681 if (!Map) 1682 return {}; 1683 1684 StoredDeclsMap::iterator I = Map->find(Name); 1685 if (I == Map->end()) 1686 return {}; 1687 1688 return I->second.getLookupResult(); 1689} 1690 1691DeclContext::lookup_result 1692DeclContext::noload_lookup(DeclarationName Name) { 1693 assert(getDeclKind() != Decl::LinkageSpec && 1694 getDeclKind() != Decl::Export && 1695 "should not perform lookups into transparent contexts"); 1696 1697 DeclContext *PrimaryContext = getPrimaryContext(); 1698 if (PrimaryContext != this) 1699 return PrimaryContext->noload_lookup(Name); 1700 1701 loadLazyLocalLexicalLookups(); 1702 StoredDeclsMap *Map = LookupPtr; 1703 if (!Map) 1704 return {}; 1705 1706 StoredDeclsMap::iterator I = Map->find(Name); 1707 return I != Map->end() ? I->second.getLookupResult() 1708 : lookup_result(); 1709} 1710 1711// If we have any lazy lexical declarations not in our lookup map, add them 1712// now. Don't import any external declarations, not even if we know we have 1713// some missing from the external visible lookups. 1714void DeclContext::loadLazyLocalLexicalLookups() { 1715 if (hasLazyLocalLexicalLookups()) { 1716 SmallVector<DeclContext *, 2> Contexts; 1717 collectAllContexts(Contexts); 1718 for (auto *Context : Contexts) 1719 buildLookupImpl(Context, hasExternalVisibleStorage()); 1720 setHasLazyLocalLexicalLookups(false); 1721 } 1722} 1723 1724void DeclContext::localUncachedLookup(DeclarationName Name, 1725 SmallVectorImpl<NamedDecl *> &Results) { 1726 Results.clear(); 1727 1728 // If there's no external storage, just perform a normal lookup and copy 1729 // the results. 1730 if (!hasExternalVisibleStorage() && !hasExternalLexicalStorage() && Name) { 1731 lookup_result LookupResults = lookup(Name); 1732 Results.insert(Results.end(), LookupResults.begin(), LookupResults.end()); 1733 return; 1734 } 1735 1736 // If we have a lookup table, check there first. Maybe we'll get lucky. 1737 // FIXME: Should we be checking these flags on the primary context? 1738 if (Name && !hasLazyLocalLexicalLookups() && 1739 !hasLazyExternalLexicalLookups()) { 1740 if (StoredDeclsMap *Map = LookupPtr) { 1741 StoredDeclsMap::iterator Pos = Map->find(Name); 1742 if (Pos != Map->end()) { 1743 Results.insert(Results.end(), 1744 Pos->second.getLookupResult().begin(), 1745 Pos->second.getLookupResult().end()); 1746 return; 1747 } 1748 } 1749 } 1750 1751 // Slow case: grovel through the declarations in our chain looking for 1752 // matches. 1753 // FIXME: If we have lazy external declarations, this will not find them! 1754 // FIXME: Should we CollectAllContexts and walk them all here? 1755 for (Decl *D = FirstDecl; D; D = D->getNextDeclInContext()) { 1756 if (auto *ND = dyn_cast<NamedDecl>(D)) 1757 if (ND->getDeclName() == Name) 1758 Results.push_back(ND); 1759 } 1760} 1761 1762DeclContext *DeclContext::getRedeclContext() { 1763 DeclContext *Ctx = this; 1764 1765 // In C, a record type is the redeclaration context for its fields only. If 1766 // we arrive at a record context after skipping anything else, we should skip 1767 // the record as well. Currently, this means skipping enumerations because 1768 // they're the only transparent context that can exist within a struct or 1769 // union. 1770 bool SkipRecords = getDeclKind() == Decl::Kind::Enum && 1771 !getParentASTContext().getLangOpts().CPlusPlus; 1772 1773 // Skip through contexts to get to the redeclaration context. Transparent 1774 // contexts are always skipped. 1775 while ((SkipRecords && Ctx->isRecord()) || Ctx->isTransparentContext()) 1776 Ctx = Ctx->getParent(); 1777 return Ctx; 1778} 1779 1780DeclContext *DeclContext::getEnclosingNamespaceContext() { 1781 DeclContext *Ctx = this; 1782 // Skip through non-namespace, non-translation-unit contexts. 1783 while (!Ctx->isFileContext()) 1784 Ctx = Ctx->getParent(); 1785 return Ctx->getPrimaryContext(); 1786} 1787 1788RecordDecl *DeclContext::getOuterLexicalRecordContext() { 1789 // Loop until we find a non-record context. 1790 RecordDecl *OutermostRD = nullptr; 1791 DeclContext *DC = this; 1792 while (DC->isRecord()) { 1793 OutermostRD = cast<RecordDecl>(DC); 1794 DC = DC->getLexicalParent(); 1795 } 1796 return OutermostRD; 1797} 1798 1799bool DeclContext::InEnclosingNamespaceSetOf(const DeclContext *O) const { 1800 // For non-file contexts, this is equivalent to Equals. 1801 if (!isFileContext()) 1802 return O->Equals(this); 1803 1804 do { 1805 if (O->Equals(this)) 1806 return true; 1807 1808 const auto *NS = dyn_cast<NamespaceDecl>(O); 1809 if (!NS || !NS->isInline()) 1810 break; 1811 O = NS->getParent(); 1812 } while (O); 1813 1814 return false; 1815} 1816 1817void DeclContext::makeDeclVisibleInContext(NamedDecl *D) { 1818 DeclContext *PrimaryDC = this->getPrimaryContext(); 1819 DeclContext *DeclDC = D->getDeclContext()->getPrimaryContext(); 1820 // If the decl is being added outside of its semantic decl context, we 1821 // need to ensure that we eagerly build the lookup information for it. 1822 PrimaryDC->makeDeclVisibleInContextWithFlags(D, false, PrimaryDC == DeclDC); 1823} 1824 1825void DeclContext::makeDeclVisibleInContextWithFlags(NamedDecl *D, bool Internal, 1826 bool Recoverable) { 1827 assert(this == getPrimaryContext() && "expected a primary DC"); 1828 1829 if (!isLookupContext()) { 1830 if (isTransparentContext()) 1831 getParent()->getPrimaryContext() 1832 ->makeDeclVisibleInContextWithFlags(D, Internal, Recoverable); 1833 return; 1834 } 1835 1836 // Skip declarations which should be invisible to name lookup. 1837 if (shouldBeHidden(D)) 1838 return; 1839 1840 // If we already have a lookup data structure, perform the insertion into 1841 // it. If we might have externally-stored decls with this name, look them 1842 // up and perform the insertion. If this decl was declared outside its 1843 // semantic context, buildLookup won't add it, so add it now. 1844 // 1845 // FIXME: As a performance hack, don't add such decls into the translation 1846 // unit unless we're in C++, since qualified lookup into the TU is never 1847 // performed. 1848 if (LookupPtr || hasExternalVisibleStorage() || 1849 ((!Recoverable || D->getDeclContext() != D->getLexicalDeclContext()) && 1850 (getParentASTContext().getLangOpts().CPlusPlus || 1851 !isTranslationUnit()))) { 1852 // If we have lazily omitted any decls, they might have the same name as 1853 // the decl which we are adding, so build a full lookup table before adding 1854 // this decl. 1855 buildLookup(); 1856 makeDeclVisibleInContextImpl(D, Internal); 1857 } else { 1858 setHasLazyLocalLexicalLookups(true); 1859 } 1860 1861 // If we are a transparent context or inline namespace, insert into our 1862 // parent context, too. This operation is recursive. 1863 if (isTransparentContext() || isInlineNamespace()) 1864 getParent()->getPrimaryContext()-> 1865 makeDeclVisibleInContextWithFlags(D, Internal, Recoverable); 1866 1867 auto *DCAsDecl = cast<Decl>(this); 1868 // Notify that a decl was made visible unless we are a Tag being defined. 1869 if (!(isa<TagDecl>(DCAsDecl) && cast<TagDecl>(DCAsDecl)->isBeingDefined())) 1870 if (ASTMutationListener *L = DCAsDecl->getASTMutationListener()) 1871 L->AddedVisibleDecl(this, D); 1872} 1873 1874void DeclContext::makeDeclVisibleInContextImpl(NamedDecl *D, bool Internal) { 1875 // Find or create the stored declaration map. 1876 StoredDeclsMap *Map = LookupPtr; 1877 if (!Map) { 1878 ASTContext *C = &getParentASTContext(); 1879 Map = CreateStoredDeclsMap(*C); 1880 } 1881 1882 // If there is an external AST source, load any declarations it knows about 1883 // with this declaration's name. 1884 // If the lookup table contains an entry about this name it means that we 1885 // have already checked the external source. 1886 if (!Internal) 1887 if (ExternalASTSource *Source = getParentASTContext().getExternalSource()) 1888 if (hasExternalVisibleStorage() && 1889 Map->find(D->getDeclName()) == Map->end()) 1890 Source->FindExternalVisibleDeclsByName(this, D->getDeclName()); 1891 1892 // Insert this declaration into the map. 1893 StoredDeclsList &DeclNameEntries = (*Map)[D->getDeclName()]; 1894 1895 if (Internal) { 1896 // If this is being added as part of loading an external declaration, 1897 // this may not be the only external declaration with this name. 1898 // In this case, we never try to replace an existing declaration; we'll 1899 // handle that when we finalize the list of declarations for this name. 1900 DeclNameEntries.setHasExternalDecls(); 1901 DeclNameEntries.prependDeclNoReplace(D); 1902 return; 1903 } 1904 1905 DeclNameEntries.addOrReplaceDecl(D); 1906} 1907 1908UsingDirectiveDecl *DeclContext::udir_iterator::operator*() const { 1909 return cast<UsingDirectiveDecl>(*I); 1910} 1911 1912/// Returns iterator range [First, Last) of UsingDirectiveDecls stored within 1913/// this context. 1914DeclContext::udir_range DeclContext::using_directives() const { 1915 // FIXME: Use something more efficient than normal lookup for using 1916 // directives. In C++, using directives are looked up more than anything else. 1917 lookup_result Result = lookup(UsingDirectiveDecl::getName()); 1918 return udir_range(Result.begin(), Result.end()); 1919} 1920 1921//===----------------------------------------------------------------------===// 1922// Creation and Destruction of StoredDeclsMaps. // 1923//===----------------------------------------------------------------------===// 1924 1925StoredDeclsMap *DeclContext::CreateStoredDeclsMap(ASTContext &C) const { 1926 assert(!LookupPtr && "context already has a decls map"); 1927 assert(getPrimaryContext() == this && 1928 "creating decls map on non-primary context"); 1929 1930 StoredDeclsMap *M; 1931 bool Dependent = isDependentContext(); 1932 if (Dependent) 1933 M = new DependentStoredDeclsMap(); 1934 else 1935 M = new StoredDeclsMap(); 1936 M->Previous = C.LastSDM; 1937 C.LastSDM = llvm::PointerIntPair<StoredDeclsMap*,1>(M, Dependent); 1938 LookupPtr = M; 1939 return M; 1940} 1941 1942void ASTContext::ReleaseDeclContextMaps() { 1943 // It's okay to delete DependentStoredDeclsMaps via a StoredDeclsMap 1944 // pointer because the subclass doesn't add anything that needs to 1945 // be deleted. 1946 StoredDeclsMap::DestroyAll(LastSDM.getPointer(), LastSDM.getInt()); 1947} 1948 1949void StoredDeclsMap::DestroyAll(StoredDeclsMap *Map, bool Dependent) { 1950 while (Map) { 1951 // Advance the iteration before we invalidate memory. 1952 llvm::PointerIntPair<StoredDeclsMap*,1> Next = Map->Previous; 1953 1954 if (Dependent) 1955 delete static_cast<DependentStoredDeclsMap*>(Map); 1956 else 1957 delete Map; 1958 1959 Map = Next.getPointer(); 1960 Dependent = Next.getInt(); 1961 } 1962} 1963 1964DependentDiagnostic *DependentDiagnostic::Create(ASTContext &C, 1965 DeclContext *Parent, 1966 const PartialDiagnostic &PDiag) { 1967 assert(Parent->isDependentContext() 1968 && "cannot iterate dependent diagnostics of non-dependent context"); 1969 Parent = Parent->getPrimaryContext(); 1970 if (!Parent->LookupPtr) 1971 Parent->CreateStoredDeclsMap(C); 1972 1973 auto *Map = static_cast<DependentStoredDeclsMap *>(Parent->LookupPtr); 1974 1975 // Allocate the copy of the PartialDiagnostic via the ASTContext's 1976 // BumpPtrAllocator, rather than the ASTContext itself. 1977 DiagnosticStorage *DiagStorage = nullptr; 1978 if (PDiag.hasStorage()) 1979 DiagStorage = new (C) DiagnosticStorage; 1980 1981 auto *DD = new (C) DependentDiagnostic(PDiag, DiagStorage); 1982 1983 // TODO: Maybe we shouldn't reverse the order during insertion. 1984 DD->NextDiagnostic = Map->FirstDiagnostic; 1985 Map->FirstDiagnostic = DD; 1986 1987 return DD; 1988} 1989