1 //===--- DeclBase.cpp - Declaration AST Node Implementation ---------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements the Decl and DeclContext classes. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "clang/AST/DeclBase.h" 15 #include "clang/AST/Decl.h" 16 #include "clang/AST/DeclContextInternals.h" 17 #include "clang/AST/DeclCXX.h" 18 #include "clang/AST/DeclFriend.h" 19 #include "clang/AST/DeclObjC.h" 20 #include "clang/AST/DeclTemplate.h" 21 #include "clang/AST/DependentDiagnostic.h" 22 #include "clang/AST/ExternalASTSource.h" 23 #include "clang/AST/ASTContext.h" 24 #include "clang/AST/Type.h" 25 #include "clang/AST/Stmt.h" 26 #include "clang/AST/StmtCXX.h" 27 #include "clang/AST/ASTMutationListener.h" 28 #include "clang/Basic/TargetInfo.h" 29 #include "llvm/ADT/DenseMap.h" 30 #include "llvm/Support/raw_ostream.h" 31 #include <algorithm> 32 using namespace clang; 33 34 //===----------------------------------------------------------------------===// 35 // Statistics 36 //===----------------------------------------------------------------------===// 37 38 #define DECL(DERIVED, BASE) static int n##DERIVED##s = 0; 39 #define ABSTRACT_DECL(DECL) 40 #include "clang/AST/DeclNodes.inc" 41 42 void *Decl::AllocateDeserializedDecl(const ASTContext &Context, 43 unsigned ID, 44 unsigned Size) { 45 // Allocate an extra 8 bytes worth of storage, which ensures that the 46 // resulting pointer will still be 8-byte aligned. 47 void *Start = Context.Allocate(Size + 8); 48 void *Result = (char*)Start + 8; 49 50 unsigned *PrefixPtr = (unsigned *)Result - 2; 51 52 // Zero out the first 4 bytes; this is used to store the owning module ID. 53 PrefixPtr[0] = 0; 54 55 // Store the global declaration ID in the second 4 bytes. 56 PrefixPtr[1] = ID; 57 58 return Result; 59 } 60 61 const char *Decl::getDeclKindName() const { 62 switch (DeclKind) { 63 default: llvm_unreachable("Declaration not in DeclNodes.inc!"); 64 #define DECL(DERIVED, BASE) case DERIVED: return #DERIVED; 65 #define ABSTRACT_DECL(DECL) 66 #include "clang/AST/DeclNodes.inc" 67 } 68 } 69 70 void Decl::setInvalidDecl(bool Invalid) { 71 InvalidDecl = Invalid; 72 if (Invalid && !isa<ParmVarDecl>(this)) { 73 // Defensive maneuver for ill-formed code: we're likely not to make it to 74 // a point where we set the access specifier, so default it to "public" 75 // to avoid triggering asserts elsewhere in the front end. 76 setAccess(AS_public); 77 } 78 } 79 80 const char *DeclContext::getDeclKindName() const { 81 switch (DeclKind) { 82 default: llvm_unreachable("Declaration context not in DeclNodes.inc!"); 83 #define DECL(DERIVED, BASE) case Decl::DERIVED: return #DERIVED; 84 #define ABSTRACT_DECL(DECL) 85 #include "clang/AST/DeclNodes.inc" 86 } 87 } 88 89 bool Decl::StatisticsEnabled = false; 90 void Decl::EnableStatistics() { 91 StatisticsEnabled = true; 92 } 93 94 void Decl::PrintStats() { 95 llvm::errs() << "\n*** Decl Stats:\n"; 96 97 int totalDecls = 0; 98 #define DECL(DERIVED, BASE) totalDecls += n##DERIVED##s; 99 #define ABSTRACT_DECL(DECL) 100 #include "clang/AST/DeclNodes.inc" 101 llvm::errs() << " " << totalDecls << " decls total.\n"; 102 103 int totalBytes = 0; 104 #define DECL(DERIVED, BASE) \ 105 if (n##DERIVED##s > 0) { \ 106 totalBytes += (int)(n##DERIVED##s * sizeof(DERIVED##Decl)); \ 107 llvm::errs() << " " << n##DERIVED##s << " " #DERIVED " decls, " \ 108 << sizeof(DERIVED##Decl) << " each (" \ 109 << n##DERIVED##s * sizeof(DERIVED##Decl) \ 110 << " bytes)\n"; \ 111 } 112 #define ABSTRACT_DECL(DECL) 113 #include "clang/AST/DeclNodes.inc" 114 115 llvm::errs() << "Total bytes = " << totalBytes << "\n"; 116 } 117 118 void Decl::add(Kind k) { 119 switch (k) { 120 #define DECL(DERIVED, BASE) case DERIVED: ++n##DERIVED##s; break; 121 #define ABSTRACT_DECL(DECL) 122 #include "clang/AST/DeclNodes.inc" 123 } 124 } 125 126 bool Decl::isTemplateParameterPack() const { 127 if (const TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(this)) 128 return TTP->isParameterPack(); 129 if (const NonTypeTemplateParmDecl *NTTP 130 = dyn_cast<NonTypeTemplateParmDecl>(this)) 131 return NTTP->isParameterPack(); 132 if (const TemplateTemplateParmDecl *TTP 133 = dyn_cast<TemplateTemplateParmDecl>(this)) 134 return TTP->isParameterPack(); 135 return false; 136 } 137 138 bool Decl::isParameterPack() const { 139 if (const ParmVarDecl *Parm = dyn_cast<ParmVarDecl>(this)) 140 return Parm->isParameterPack(); 141 142 return isTemplateParameterPack(); 143 } 144 145 bool Decl::isFunctionOrFunctionTemplate() const { 146 if (const UsingShadowDecl *UD = dyn_cast<UsingShadowDecl>(this)) 147 return UD->getTargetDecl()->isFunctionOrFunctionTemplate(); 148 149 return isa<FunctionDecl>(this) || isa<FunctionTemplateDecl>(this); 150 } 151 152 bool Decl::isTemplateDecl() const { 153 return isa<TemplateDecl>(this); 154 } 155 156 const DeclContext *Decl::getParentFunctionOrMethod() const { 157 for (const DeclContext *DC = getDeclContext(); 158 DC && !DC->isTranslationUnit() && !DC->isNamespace(); 159 DC = DC->getParent()) 160 if (DC->isFunctionOrMethod()) 161 return DC; 162 163 return 0; 164 } 165 166 167 //===----------------------------------------------------------------------===// 168 // PrettyStackTraceDecl Implementation 169 //===----------------------------------------------------------------------===// 170 171 void PrettyStackTraceDecl::print(raw_ostream &OS) const { 172 SourceLocation TheLoc = Loc; 173 if (TheLoc.isInvalid() && TheDecl) 174 TheLoc = TheDecl->getLocation(); 175 176 if (TheLoc.isValid()) { 177 TheLoc.print(OS, SM); 178 OS << ": "; 179 } 180 181 OS << Message; 182 183 if (const NamedDecl *DN = dyn_cast_or_null<NamedDecl>(TheDecl)) 184 OS << " '" << DN->getQualifiedNameAsString() << '\''; 185 OS << '\n'; 186 } 187 188 //===----------------------------------------------------------------------===// 189 // Decl Implementation 190 //===----------------------------------------------------------------------===// 191 192 // Out-of-line virtual method providing a home for Decl. 193 Decl::~Decl() { } 194 195 void Decl::setDeclContext(DeclContext *DC) { 196 DeclCtx = DC; 197 } 198 199 void Decl::setLexicalDeclContext(DeclContext *DC) { 200 if (DC == getLexicalDeclContext()) 201 return; 202 203 if (isInSemaDC()) { 204 setDeclContextsImpl(getDeclContext(), DC, getASTContext()); 205 } else { 206 getMultipleDC()->LexicalDC = DC; 207 } 208 } 209 210 void Decl::setDeclContextsImpl(DeclContext *SemaDC, DeclContext *LexicalDC, 211 ASTContext &Ctx) { 212 if (SemaDC == LexicalDC) { 213 DeclCtx = SemaDC; 214 } else { 215 Decl::MultipleDC *MDC = new (Ctx) Decl::MultipleDC(); 216 MDC->SemanticDC = SemaDC; 217 MDC->LexicalDC = LexicalDC; 218 DeclCtx = MDC; 219 } 220 } 221 222 bool Decl::isInAnonymousNamespace() const { 223 const DeclContext *DC = getDeclContext(); 224 do { 225 if (const NamespaceDecl *ND = dyn_cast<NamespaceDecl>(DC)) 226 if (ND->isAnonymousNamespace()) 227 return true; 228 } while ((DC = DC->getParent())); 229 230 return false; 231 } 232 233 TranslationUnitDecl *Decl::getTranslationUnitDecl() { 234 if (TranslationUnitDecl *TUD = dyn_cast<TranslationUnitDecl>(this)) 235 return TUD; 236 237 DeclContext *DC = getDeclContext(); 238 assert(DC && "This decl is not contained in a translation unit!"); 239 240 while (!DC->isTranslationUnit()) { 241 DC = DC->getParent(); 242 assert(DC && "This decl is not contained in a translation unit!"); 243 } 244 245 return cast<TranslationUnitDecl>(DC); 246 } 247 248 ASTContext &Decl::getASTContext() const { 249 return getTranslationUnitDecl()->getASTContext(); 250 } 251 252 ASTMutationListener *Decl::getASTMutationListener() const { 253 return getASTContext().getASTMutationListener(); 254 } 255 256 bool Decl::isUsed(bool CheckUsedAttr) const { 257 if (Used) 258 return true; 259 260 // Check for used attribute. 261 if (CheckUsedAttr && hasAttr<UsedAttr>()) 262 return true; 263 264 // Check redeclarations for used attribute. 265 for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) { 266 if ((CheckUsedAttr && I->hasAttr<UsedAttr>()) || I->Used) 267 return true; 268 } 269 270 return false; 271 } 272 273 bool Decl::isReferenced() const { 274 if (Referenced) 275 return true; 276 277 // Check redeclarations. 278 for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) 279 if (I->Referenced) 280 return true; 281 282 return false; 283 } 284 285 /// \brief Determine the availability of the given declaration based on 286 /// the target platform. 287 /// 288 /// When it returns an availability result other than \c AR_Available, 289 /// if the \p Message parameter is non-NULL, it will be set to a 290 /// string describing why the entity is unavailable. 291 /// 292 /// FIXME: Make these strings localizable, since they end up in 293 /// diagnostics. 294 static AvailabilityResult CheckAvailability(ASTContext &Context, 295 const AvailabilityAttr *A, 296 std::string *Message) { 297 StringRef TargetPlatform = Context.getTargetInfo().getPlatformName(); 298 StringRef PrettyPlatformName 299 = AvailabilityAttr::getPrettyPlatformName(TargetPlatform); 300 if (PrettyPlatformName.empty()) 301 PrettyPlatformName = TargetPlatform; 302 303 VersionTuple TargetMinVersion = Context.getTargetInfo().getPlatformMinVersion(); 304 if (TargetMinVersion.empty()) 305 return AR_Available; 306 307 // Match the platform name. 308 if (A->getPlatform()->getName() != TargetPlatform) 309 return AR_Available; 310 311 std::string HintMessage; 312 if (!A->getMessage().empty()) { 313 HintMessage = " - "; 314 HintMessage += A->getMessage(); 315 } 316 317 // Make sure that this declaration has not been marked 'unavailable'. 318 if (A->getUnavailable()) { 319 if (Message) { 320 Message->clear(); 321 llvm::raw_string_ostream Out(*Message); 322 Out << "not available on " << PrettyPlatformName 323 << HintMessage; 324 } 325 326 return AR_Unavailable; 327 } 328 329 // Make sure that this declaration has already been introduced. 330 if (!A->getIntroduced().empty() && 331 TargetMinVersion < A->getIntroduced()) { 332 if (Message) { 333 Message->clear(); 334 llvm::raw_string_ostream Out(*Message); 335 Out << "introduced in " << PrettyPlatformName << ' ' 336 << A->getIntroduced() << HintMessage; 337 } 338 339 return AR_NotYetIntroduced; 340 } 341 342 // Make sure that this declaration hasn't been obsoleted. 343 if (!A->getObsoleted().empty() && TargetMinVersion >= A->getObsoleted()) { 344 if (Message) { 345 Message->clear(); 346 llvm::raw_string_ostream Out(*Message); 347 Out << "obsoleted in " << PrettyPlatformName << ' ' 348 << A->getObsoleted() << HintMessage; 349 } 350 351 return AR_Unavailable; 352 } 353 354 // Make sure that this declaration hasn't been deprecated. 355 if (!A->getDeprecated().empty() && TargetMinVersion >= A->getDeprecated()) { 356 if (Message) { 357 Message->clear(); 358 llvm::raw_string_ostream Out(*Message); 359 Out << "first deprecated in " << PrettyPlatformName << ' ' 360 << A->getDeprecated() << HintMessage; 361 } 362 363 return AR_Deprecated; 364 } 365 366 return AR_Available; 367 } 368 369 AvailabilityResult Decl::getAvailability(std::string *Message) const { 370 AvailabilityResult Result = AR_Available; 371 std::string ResultMessage; 372 373 for (attr_iterator A = attr_begin(), AEnd = attr_end(); A != AEnd; ++A) { 374 if (DeprecatedAttr *Deprecated = dyn_cast<DeprecatedAttr>(*A)) { 375 if (Result >= AR_Deprecated) 376 continue; 377 378 if (Message) 379 ResultMessage = Deprecated->getMessage(); 380 381 Result = AR_Deprecated; 382 continue; 383 } 384 385 if (UnavailableAttr *Unavailable = dyn_cast<UnavailableAttr>(*A)) { 386 if (Message) 387 *Message = Unavailable->getMessage(); 388 return AR_Unavailable; 389 } 390 391 if (AvailabilityAttr *Availability = dyn_cast<AvailabilityAttr>(*A)) { 392 AvailabilityResult AR = CheckAvailability(getASTContext(), Availability, 393 Message); 394 395 if (AR == AR_Unavailable) 396 return AR_Unavailable; 397 398 if (AR > Result) { 399 Result = AR; 400 if (Message) 401 ResultMessage.swap(*Message); 402 } 403 continue; 404 } 405 } 406 407 if (Message) 408 Message->swap(ResultMessage); 409 return Result; 410 } 411 412 bool Decl::canBeWeakImported(bool &IsDefinition) const { 413 IsDefinition = false; 414 if (const VarDecl *Var = dyn_cast<VarDecl>(this)) { 415 if (!Var->hasExternalStorage() || Var->getInit()) { 416 IsDefinition = true; 417 return false; 418 } 419 } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(this)) { 420 if (FD->hasBody()) { 421 IsDefinition = true; 422 return false; 423 } 424 } else if (isa<ObjCPropertyDecl>(this) || isa<ObjCMethodDecl>(this)) 425 return false; 426 else if (!(getASTContext().getLangOpts().ObjCNonFragileABI && 427 isa<ObjCInterfaceDecl>(this))) 428 return false; 429 430 return true; 431 } 432 433 bool Decl::isWeakImported() const { 434 bool IsDefinition; 435 if (!canBeWeakImported(IsDefinition)) 436 return false; 437 438 for (attr_iterator A = attr_begin(), AEnd = attr_end(); A != AEnd; ++A) { 439 if (isa<WeakImportAttr>(*A)) 440 return true; 441 442 if (AvailabilityAttr *Availability = dyn_cast<AvailabilityAttr>(*A)) { 443 if (CheckAvailability(getASTContext(), Availability, 0) 444 == AR_NotYetIntroduced) 445 return true; 446 } 447 } 448 449 return false; 450 } 451 452 unsigned Decl::getIdentifierNamespaceForKind(Kind DeclKind) { 453 switch (DeclKind) { 454 case Function: 455 case CXXMethod: 456 case CXXConstructor: 457 case CXXDestructor: 458 case CXXConversion: 459 case EnumConstant: 460 case Var: 461 case ImplicitParam: 462 case ParmVar: 463 case NonTypeTemplateParm: 464 case ObjCMethod: 465 case ObjCProperty: 466 return IDNS_Ordinary; 467 case Label: 468 return IDNS_Label; 469 case IndirectField: 470 return IDNS_Ordinary | IDNS_Member; 471 472 case ObjCCompatibleAlias: 473 case ObjCInterface: 474 return IDNS_Ordinary | IDNS_Type; 475 476 case Typedef: 477 case TypeAlias: 478 case TypeAliasTemplate: 479 case UnresolvedUsingTypename: 480 case TemplateTypeParm: 481 return IDNS_Ordinary | IDNS_Type; 482 483 case UsingShadow: 484 return 0; // we'll actually overwrite this later 485 486 case UnresolvedUsingValue: 487 return IDNS_Ordinary | IDNS_Using; 488 489 case Using: 490 return IDNS_Using; 491 492 case ObjCProtocol: 493 return IDNS_ObjCProtocol; 494 495 case Field: 496 case ObjCAtDefsField: 497 case ObjCIvar: 498 return IDNS_Member; 499 500 case Record: 501 case CXXRecord: 502 case Enum: 503 return IDNS_Tag | IDNS_Type; 504 505 case Namespace: 506 case NamespaceAlias: 507 return IDNS_Namespace; 508 509 case FunctionTemplate: 510 return IDNS_Ordinary; 511 512 case ClassTemplate: 513 case TemplateTemplateParm: 514 return IDNS_Ordinary | IDNS_Tag | IDNS_Type; 515 516 // Never have names. 517 case Friend: 518 case FriendTemplate: 519 case AccessSpec: 520 case LinkageSpec: 521 case FileScopeAsm: 522 case StaticAssert: 523 case ObjCPropertyImpl: 524 case Block: 525 case TranslationUnit: 526 527 case UsingDirective: 528 case ClassTemplateSpecialization: 529 case ClassTemplatePartialSpecialization: 530 case ClassScopeFunctionSpecialization: 531 case ObjCImplementation: 532 case ObjCCategory: 533 case ObjCCategoryImpl: 534 case Import: 535 // Never looked up by name. 536 return 0; 537 } 538 539 llvm_unreachable("Invalid DeclKind!"); 540 } 541 542 void Decl::setAttrsImpl(const AttrVec &attrs, ASTContext &Ctx) { 543 assert(!HasAttrs && "Decl already contains attrs."); 544 545 AttrVec &AttrBlank = Ctx.getDeclAttrs(this); 546 assert(AttrBlank.empty() && "HasAttrs was wrong?"); 547 548 AttrBlank = attrs; 549 HasAttrs = true; 550 } 551 552 void Decl::dropAttrs() { 553 if (!HasAttrs) return; 554 555 HasAttrs = false; 556 getASTContext().eraseDeclAttrs(this); 557 } 558 559 const AttrVec &Decl::getAttrs() const { 560 assert(HasAttrs && "No attrs to get!"); 561 return getASTContext().getDeclAttrs(this); 562 } 563 564 void Decl::swapAttrs(Decl *RHS) { 565 bool HasLHSAttr = this->HasAttrs; 566 bool HasRHSAttr = RHS->HasAttrs; 567 568 // Usually, neither decl has attrs, nothing to do. 569 if (!HasLHSAttr && !HasRHSAttr) return; 570 571 // If 'this' has no attrs, swap the other way. 572 if (!HasLHSAttr) 573 return RHS->swapAttrs(this); 574 575 ASTContext &Context = getASTContext(); 576 577 // Handle the case when both decls have attrs. 578 if (HasRHSAttr) { 579 std::swap(Context.getDeclAttrs(this), Context.getDeclAttrs(RHS)); 580 return; 581 } 582 583 // Otherwise, LHS has an attr and RHS doesn't. 584 Context.getDeclAttrs(RHS) = Context.getDeclAttrs(this); 585 Context.eraseDeclAttrs(this); 586 this->HasAttrs = false; 587 RHS->HasAttrs = true; 588 } 589 590 Decl *Decl::castFromDeclContext (const DeclContext *D) { 591 Decl::Kind DK = D->getDeclKind(); 592 switch(DK) { 593 #define DECL(NAME, BASE) 594 #define DECL_CONTEXT(NAME) \ 595 case Decl::NAME: \ 596 return static_cast<NAME##Decl*>(const_cast<DeclContext*>(D)); 597 #define DECL_CONTEXT_BASE(NAME) 598 #include "clang/AST/DeclNodes.inc" 599 default: 600 #define DECL(NAME, BASE) 601 #define DECL_CONTEXT_BASE(NAME) \ 602 if (DK >= first##NAME && DK <= last##NAME) \ 603 return static_cast<NAME##Decl*>(const_cast<DeclContext*>(D)); 604 #include "clang/AST/DeclNodes.inc" 605 llvm_unreachable("a decl that inherits DeclContext isn't handled"); 606 } 607 } 608 609 DeclContext *Decl::castToDeclContext(const Decl *D) { 610 Decl::Kind DK = D->getKind(); 611 switch(DK) { 612 #define DECL(NAME, BASE) 613 #define DECL_CONTEXT(NAME) \ 614 case Decl::NAME: \ 615 return static_cast<NAME##Decl*>(const_cast<Decl*>(D)); 616 #define DECL_CONTEXT_BASE(NAME) 617 #include "clang/AST/DeclNodes.inc" 618 default: 619 #define DECL(NAME, BASE) 620 #define DECL_CONTEXT_BASE(NAME) \ 621 if (DK >= first##NAME && DK <= last##NAME) \ 622 return static_cast<NAME##Decl*>(const_cast<Decl*>(D)); 623 #include "clang/AST/DeclNodes.inc" 624 llvm_unreachable("a decl that inherits DeclContext isn't handled"); 625 } 626 } 627 628 SourceLocation Decl::getBodyRBrace() const { 629 // Special handling of FunctionDecl to avoid de-serializing the body from PCH. 630 // FunctionDecl stores EndRangeLoc for this purpose. 631 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(this)) { 632 const FunctionDecl *Definition; 633 if (FD->hasBody(Definition)) 634 return Definition->getSourceRange().getEnd(); 635 return SourceLocation(); 636 } 637 638 if (Stmt *Body = getBody()) 639 return Body->getSourceRange().getEnd(); 640 641 return SourceLocation(); 642 } 643 644 void Decl::CheckAccessDeclContext() const { 645 #ifndef NDEBUG 646 // Suppress this check if any of the following hold: 647 // 1. this is the translation unit (and thus has no parent) 648 // 2. this is a template parameter (and thus doesn't belong to its context) 649 // 3. this is a non-type template parameter 650 // 4. the context is not a record 651 // 5. it's invalid 652 // 6. it's a C++0x static_assert. 653 if (isa<TranslationUnitDecl>(this) || 654 isa<TemplateTypeParmDecl>(this) || 655 isa<NonTypeTemplateParmDecl>(this) || 656 !isa<CXXRecordDecl>(getDeclContext()) || 657 isInvalidDecl() || 658 isa<StaticAssertDecl>(this) || 659 // FIXME: a ParmVarDecl can have ClassTemplateSpecialization 660 // as DeclContext (?). 661 isa<ParmVarDecl>(this) || 662 // FIXME: a ClassTemplateSpecialization or CXXRecordDecl can have 663 // AS_none as access specifier. 664 isa<CXXRecordDecl>(this) || 665 isa<ClassScopeFunctionSpecializationDecl>(this)) 666 return; 667 668 assert(Access != AS_none && 669 "Access specifier is AS_none inside a record decl"); 670 #endif 671 } 672 673 DeclContext *Decl::getNonClosureContext() { 674 return getDeclContext()->getNonClosureAncestor(); 675 } 676 677 DeclContext *DeclContext::getNonClosureAncestor() { 678 DeclContext *DC = this; 679 680 // This is basically "while (DC->isClosure()) DC = DC->getParent();" 681 // except that it's significantly more efficient to cast to a known 682 // decl type and call getDeclContext() than to call getParent(). 683 while (isa<BlockDecl>(DC)) 684 DC = cast<BlockDecl>(DC)->getDeclContext(); 685 686 assert(!DC->isClosure()); 687 return DC; 688 } 689 690 //===----------------------------------------------------------------------===// 691 // DeclContext Implementation 692 //===----------------------------------------------------------------------===// 693 694 bool DeclContext::classof(const Decl *D) { 695 switch (D->getKind()) { 696 #define DECL(NAME, BASE) 697 #define DECL_CONTEXT(NAME) case Decl::NAME: 698 #define DECL_CONTEXT_BASE(NAME) 699 #include "clang/AST/DeclNodes.inc" 700 return true; 701 default: 702 #define DECL(NAME, BASE) 703 #define DECL_CONTEXT_BASE(NAME) \ 704 if (D->getKind() >= Decl::first##NAME && \ 705 D->getKind() <= Decl::last##NAME) \ 706 return true; 707 #include "clang/AST/DeclNodes.inc" 708 return false; 709 } 710 } 711 712 DeclContext::~DeclContext() { } 713 714 /// \brief Find the parent context of this context that will be 715 /// used for unqualified name lookup. 716 /// 717 /// Generally, the parent lookup context is the semantic context. However, for 718 /// a friend function the parent lookup context is the lexical context, which 719 /// is the class in which the friend is declared. 720 DeclContext *DeclContext::getLookupParent() { 721 // FIXME: Find a better way to identify friends 722 if (isa<FunctionDecl>(this)) 723 if (getParent()->getRedeclContext()->isFileContext() && 724 getLexicalParent()->getRedeclContext()->isRecord()) 725 return getLexicalParent(); 726 727 return getParent(); 728 } 729 730 bool DeclContext::isInlineNamespace() const { 731 return isNamespace() && 732 cast<NamespaceDecl>(this)->isInline(); 733 } 734 735 bool DeclContext::isDependentContext() const { 736 if (isFileContext()) 737 return false; 738 739 if (isa<ClassTemplatePartialSpecializationDecl>(this)) 740 return true; 741 742 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(this)) { 743 if (Record->getDescribedClassTemplate()) 744 return true; 745 746 if (Record->isDependentLambda()) 747 return true; 748 } 749 750 if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(this)) { 751 if (Function->getDescribedFunctionTemplate()) 752 return true; 753 754 // Friend function declarations are dependent if their *lexical* 755 // context is dependent. 756 if (cast<Decl>(this)->getFriendObjectKind()) 757 return getLexicalParent()->isDependentContext(); 758 } 759 760 return getParent() && getParent()->isDependentContext(); 761 } 762 763 bool DeclContext::isTransparentContext() const { 764 if (DeclKind == Decl::Enum) 765 return !cast<EnumDecl>(this)->isScoped(); 766 else if (DeclKind == Decl::LinkageSpec) 767 return true; 768 769 return false; 770 } 771 772 bool DeclContext::isExternCContext() const { 773 const DeclContext *DC = this; 774 while (DC->DeclKind != Decl::TranslationUnit) { 775 if (DC->DeclKind == Decl::LinkageSpec) 776 return cast<LinkageSpecDecl>(DC)->getLanguage() 777 == LinkageSpecDecl::lang_c; 778 DC = DC->getParent(); 779 } 780 return false; 781 } 782 783 bool DeclContext::Encloses(const DeclContext *DC) const { 784 if (getPrimaryContext() != this) 785 return getPrimaryContext()->Encloses(DC); 786 787 for (; DC; DC = DC->getParent()) 788 if (DC->getPrimaryContext() == this) 789 return true; 790 return false; 791 } 792 793 DeclContext *DeclContext::getPrimaryContext() { 794 switch (DeclKind) { 795 case Decl::TranslationUnit: 796 case Decl::LinkageSpec: 797 case Decl::Block: 798 // There is only one DeclContext for these entities. 799 return this; 800 801 case Decl::Namespace: 802 // The original namespace is our primary context. 803 return static_cast<NamespaceDecl*>(this)->getOriginalNamespace(); 804 805 case Decl::ObjCMethod: 806 return this; 807 808 case Decl::ObjCInterface: 809 if (ObjCInterfaceDecl *Def = cast<ObjCInterfaceDecl>(this)->getDefinition()) 810 return Def; 811 812 return this; 813 814 case Decl::ObjCProtocol: 815 if (ObjCProtocolDecl *Def = cast<ObjCProtocolDecl>(this)->getDefinition()) 816 return Def; 817 818 return this; 819 820 case Decl::ObjCCategory: 821 return this; 822 823 case Decl::ObjCImplementation: 824 case Decl::ObjCCategoryImpl: 825 return this; 826 827 default: 828 if (DeclKind >= Decl::firstTag && DeclKind <= Decl::lastTag) { 829 // If this is a tag type that has a definition or is currently 830 // being defined, that definition is our primary context. 831 TagDecl *Tag = cast<TagDecl>(this); 832 assert(isa<TagType>(Tag->TypeForDecl) || 833 isa<InjectedClassNameType>(Tag->TypeForDecl)); 834 835 if (TagDecl *Def = Tag->getDefinition()) 836 return Def; 837 838 if (!isa<InjectedClassNameType>(Tag->TypeForDecl)) { 839 const TagType *TagTy = cast<TagType>(Tag->TypeForDecl); 840 if (TagTy->isBeingDefined()) 841 // FIXME: is it necessarily being defined in the decl 842 // that owns the type? 843 return TagTy->getDecl(); 844 } 845 846 return Tag; 847 } 848 849 assert(DeclKind >= Decl::firstFunction && DeclKind <= Decl::lastFunction && 850 "Unknown DeclContext kind"); 851 return this; 852 } 853 } 854 855 void 856 DeclContext::collectAllContexts(llvm::SmallVectorImpl<DeclContext *> &Contexts){ 857 Contexts.clear(); 858 859 if (DeclKind != Decl::Namespace) { 860 Contexts.push_back(this); 861 return; 862 } 863 864 NamespaceDecl *Self = static_cast<NamespaceDecl *>(this); 865 for (NamespaceDecl *N = Self->getMostRecentDecl(); N; 866 N = N->getPreviousDecl()) 867 Contexts.push_back(N); 868 869 std::reverse(Contexts.begin(), Contexts.end()); 870 } 871 872 std::pair<Decl *, Decl *> 873 DeclContext::BuildDeclChain(ArrayRef<Decl*> Decls, 874 bool FieldsAlreadyLoaded) { 875 // Build up a chain of declarations via the Decl::NextInContextAndBits field. 876 Decl *FirstNewDecl = 0; 877 Decl *PrevDecl = 0; 878 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 879 if (FieldsAlreadyLoaded && isa<FieldDecl>(Decls[I])) 880 continue; 881 882 Decl *D = Decls[I]; 883 if (PrevDecl) 884 PrevDecl->NextInContextAndBits.setPointer(D); 885 else 886 FirstNewDecl = D; 887 888 PrevDecl = D; 889 } 890 891 return std::make_pair(FirstNewDecl, PrevDecl); 892 } 893 894 /// \brief Load the declarations within this lexical storage from an 895 /// external source. 896 void 897 DeclContext::LoadLexicalDeclsFromExternalStorage() const { 898 ExternalASTSource *Source = getParentASTContext().getExternalSource(); 899 assert(hasExternalLexicalStorage() && Source && "No external storage?"); 900 901 // Notify that we have a DeclContext that is initializing. 902 ExternalASTSource::Deserializing ADeclContext(Source); 903 904 // Load the external declarations, if any. 905 SmallVector<Decl*, 64> Decls; 906 ExternalLexicalStorage = false; 907 switch (Source->FindExternalLexicalDecls(this, Decls)) { 908 case ELR_Success: 909 break; 910 911 case ELR_Failure: 912 case ELR_AlreadyLoaded: 913 return; 914 } 915 916 if (Decls.empty()) 917 return; 918 919 // We may have already loaded just the fields of this record, in which case 920 // we need to ignore them. 921 bool FieldsAlreadyLoaded = false; 922 if (const RecordDecl *RD = dyn_cast<RecordDecl>(this)) 923 FieldsAlreadyLoaded = RD->LoadedFieldsFromExternalStorage; 924 925 // Splice the newly-read declarations into the beginning of the list 926 // of declarations. 927 Decl *ExternalFirst, *ExternalLast; 928 llvm::tie(ExternalFirst, ExternalLast) = BuildDeclChain(Decls, 929 FieldsAlreadyLoaded); 930 ExternalLast->NextInContextAndBits.setPointer(FirstDecl); 931 FirstDecl = ExternalFirst; 932 if (!LastDecl) 933 LastDecl = ExternalLast; 934 } 935 936 DeclContext::lookup_result 937 ExternalASTSource::SetNoExternalVisibleDeclsForName(const DeclContext *DC, 938 DeclarationName Name) { 939 ASTContext &Context = DC->getParentASTContext(); 940 StoredDeclsMap *Map; 941 if (!(Map = DC->LookupPtr.getPointer())) 942 Map = DC->CreateStoredDeclsMap(Context); 943 944 StoredDeclsList &List = (*Map)[Name]; 945 assert(List.isNull()); 946 (void) List; 947 948 return DeclContext::lookup_result(); 949 } 950 951 DeclContext::lookup_result 952 ExternalASTSource::SetExternalVisibleDeclsForName(const DeclContext *DC, 953 DeclarationName Name, 954 ArrayRef<NamedDecl*> Decls) { 955 ASTContext &Context = DC->getParentASTContext();; 956 957 StoredDeclsMap *Map; 958 if (!(Map = DC->LookupPtr.getPointer())) 959 Map = DC->CreateStoredDeclsMap(Context); 960 961 StoredDeclsList &List = (*Map)[Name]; 962 for (ArrayRef<NamedDecl*>::iterator 963 I = Decls.begin(), E = Decls.end(); I != E; ++I) { 964 if (List.isNull()) 965 List.setOnlyValue(*I); 966 else 967 List.AddSubsequentDecl(*I); 968 } 969 970 return List.getLookupResult(); 971 } 972 973 DeclContext::decl_iterator DeclContext::noload_decls_begin() const { 974 return decl_iterator(FirstDecl); 975 } 976 977 DeclContext::decl_iterator DeclContext::noload_decls_end() const { 978 return decl_iterator(); 979 } 980 981 DeclContext::decl_iterator DeclContext::decls_begin() const { 982 if (hasExternalLexicalStorage()) 983 LoadLexicalDeclsFromExternalStorage(); 984 985 return decl_iterator(FirstDecl); 986 } 987 988 DeclContext::decl_iterator DeclContext::decls_end() const { 989 if (hasExternalLexicalStorage()) 990 LoadLexicalDeclsFromExternalStorage(); 991 992 return decl_iterator(); 993 } 994 995 bool DeclContext::decls_empty() const { 996 if (hasExternalLexicalStorage()) 997 LoadLexicalDeclsFromExternalStorage(); 998 999 return !FirstDecl; 1000 } 1001 1002 void DeclContext::removeDecl(Decl *D) { 1003 assert(D->getLexicalDeclContext() == this && 1004 "decl being removed from non-lexical context"); 1005 assert((D->NextInContextAndBits.getPointer() || D == LastDecl) && 1006 "decl is not in decls list"); 1007 1008 // Remove D from the decl chain. This is O(n) but hopefully rare. 1009 if (D == FirstDecl) { 1010 if (D == LastDecl) 1011 FirstDecl = LastDecl = 0; 1012 else 1013 FirstDecl = D->NextInContextAndBits.getPointer(); 1014 } else { 1015 for (Decl *I = FirstDecl; true; I = I->NextInContextAndBits.getPointer()) { 1016 assert(I && "decl not found in linked list"); 1017 if (I->NextInContextAndBits.getPointer() == D) { 1018 I->NextInContextAndBits.setPointer(D->NextInContextAndBits.getPointer()); 1019 if (D == LastDecl) LastDecl = I; 1020 break; 1021 } 1022 } 1023 } 1024 1025 // Mark that D is no longer in the decl chain. 1026 D->NextInContextAndBits.setPointer(0); 1027 1028 // Remove D from the lookup table if necessary. 1029 if (isa<NamedDecl>(D)) { 1030 NamedDecl *ND = cast<NamedDecl>(D); 1031 1032 // Remove only decls that have a name 1033 if (!ND->getDeclName()) return; 1034 1035 StoredDeclsMap *Map = getPrimaryContext()->LookupPtr.getPointer(); 1036 if (!Map) return; 1037 1038 StoredDeclsMap::iterator Pos = Map->find(ND->getDeclName()); 1039 assert(Pos != Map->end() && "no lookup entry for decl"); 1040 if (Pos->second.getAsVector() || Pos->second.getAsDecl() == ND) 1041 Pos->second.remove(ND); 1042 } 1043 } 1044 1045 void DeclContext::addHiddenDecl(Decl *D) { 1046 assert(D->getLexicalDeclContext() == this && 1047 "Decl inserted into wrong lexical context"); 1048 assert(!D->getNextDeclInContext() && D != LastDecl && 1049 "Decl already inserted into a DeclContext"); 1050 1051 if (FirstDecl) { 1052 LastDecl->NextInContextAndBits.setPointer(D); 1053 LastDecl = D; 1054 } else { 1055 FirstDecl = LastDecl = D; 1056 } 1057 1058 // Notify a C++ record declaration that we've added a member, so it can 1059 // update it's class-specific state. 1060 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(this)) 1061 Record->addedMember(D); 1062 1063 // If this is a newly-created (not de-serialized) import declaration, wire 1064 // it in to the list of local import declarations. 1065 if (!D->isFromASTFile()) { 1066 if (ImportDecl *Import = dyn_cast<ImportDecl>(D)) 1067 D->getASTContext().addedLocalImportDecl(Import); 1068 } 1069 } 1070 1071 void DeclContext::addDecl(Decl *D) { 1072 addHiddenDecl(D); 1073 1074 if (NamedDecl *ND = dyn_cast<NamedDecl>(D)) 1075 ND->getDeclContext()->getPrimaryContext()-> 1076 makeDeclVisibleInContextWithFlags(ND, false, true); 1077 } 1078 1079 void DeclContext::addDeclInternal(Decl *D) { 1080 addHiddenDecl(D); 1081 1082 if (NamedDecl *ND = dyn_cast<NamedDecl>(D)) 1083 ND->getDeclContext()->getPrimaryContext()-> 1084 makeDeclVisibleInContextWithFlags(ND, true, true); 1085 } 1086 1087 /// shouldBeHidden - Determine whether a declaration which was declared 1088 /// within its semantic context should be invisible to qualified name lookup. 1089 static bool shouldBeHidden(NamedDecl *D) { 1090 // Skip unnamed declarations. 1091 if (!D->getDeclName()) 1092 return true; 1093 1094 // Skip entities that can't be found by name lookup into a particular 1095 // context. 1096 if ((D->getIdentifierNamespace() == 0 && !isa<UsingDirectiveDecl>(D)) || 1097 D->isTemplateParameter()) 1098 return true; 1099 1100 // Skip template specializations. 1101 // FIXME: This feels like a hack. Should DeclarationName support 1102 // template-ids, or is there a better way to keep specializations 1103 // from being visible? 1104 if (isa<ClassTemplateSpecializationDecl>(D)) 1105 return true; 1106 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) 1107 if (FD->isFunctionTemplateSpecialization()) 1108 return true; 1109 1110 return false; 1111 } 1112 1113 /// buildLookup - Build the lookup data structure with all of the 1114 /// declarations in this DeclContext (and any other contexts linked 1115 /// to it or transparent contexts nested within it) and return it. 1116 StoredDeclsMap *DeclContext::buildLookup() { 1117 assert(this == getPrimaryContext() && "buildLookup called on non-primary DC"); 1118 1119 if (!LookupPtr.getInt()) 1120 return LookupPtr.getPointer(); 1121 1122 llvm::SmallVector<DeclContext *, 2> Contexts; 1123 collectAllContexts(Contexts); 1124 for (unsigned I = 0, N = Contexts.size(); I != N; ++I) 1125 buildLookupImpl(Contexts[I]); 1126 1127 // We no longer have any lazy decls. 1128 LookupPtr.setInt(false); 1129 return LookupPtr.getPointer(); 1130 } 1131 1132 /// buildLookupImpl - Build part of the lookup data structure for the 1133 /// declarations contained within DCtx, which will either be this 1134 /// DeclContext, a DeclContext linked to it, or a transparent context 1135 /// nested within it. 1136 void DeclContext::buildLookupImpl(DeclContext *DCtx) { 1137 for (decl_iterator I = DCtx->decls_begin(), E = DCtx->decls_end(); 1138 I != E; ++I) { 1139 Decl *D = *I; 1140 1141 // Insert this declaration into the lookup structure, but only if 1142 // it's semantically within its decl context. Any other decls which 1143 // should be found in this context are added eagerly. 1144 if (NamedDecl *ND = dyn_cast<NamedDecl>(D)) 1145 if (ND->getDeclContext() == DCtx && !shouldBeHidden(ND)) 1146 makeDeclVisibleInContextImpl(ND, false); 1147 1148 // If this declaration is itself a transparent declaration context 1149 // or inline namespace, add the members of this declaration of that 1150 // context (recursively). 1151 if (DeclContext *InnerCtx = dyn_cast<DeclContext>(D)) 1152 if (InnerCtx->isTransparentContext() || InnerCtx->isInlineNamespace()) 1153 buildLookupImpl(InnerCtx); 1154 } 1155 } 1156 1157 DeclContext::lookup_result 1158 DeclContext::lookup(DeclarationName Name) { 1159 assert(DeclKind != Decl::LinkageSpec && 1160 "Should not perform lookups into linkage specs!"); 1161 1162 DeclContext *PrimaryContext = getPrimaryContext(); 1163 if (PrimaryContext != this) 1164 return PrimaryContext->lookup(Name); 1165 1166 if (hasExternalVisibleStorage()) { 1167 // If a PCH has a result for this name, and we have a local declaration, we 1168 // will have imported the PCH result when adding the local declaration. 1169 // FIXME: For modules, we could have had more declarations added by module 1170 // imoprts since we saw the declaration of the local name. 1171 if (StoredDeclsMap *Map = LookupPtr.getPointer()) { 1172 StoredDeclsMap::iterator I = Map->find(Name); 1173 if (I != Map->end()) 1174 return I->second.getLookupResult(); 1175 } 1176 1177 ExternalASTSource *Source = getParentASTContext().getExternalSource(); 1178 return Source->FindExternalVisibleDeclsByName(this, Name); 1179 } 1180 1181 StoredDeclsMap *Map = LookupPtr.getPointer(); 1182 if (LookupPtr.getInt()) 1183 Map = buildLookup(); 1184 1185 if (!Map) 1186 return lookup_result(lookup_iterator(0), lookup_iterator(0)); 1187 1188 StoredDeclsMap::iterator I = Map->find(Name); 1189 if (I == Map->end()) 1190 return lookup_result(lookup_iterator(0), lookup_iterator(0)); 1191 1192 return I->second.getLookupResult(); 1193 } 1194 1195 DeclContext::lookup_const_result 1196 DeclContext::lookup(DeclarationName Name) const { 1197 return const_cast<DeclContext*>(this)->lookup(Name); 1198 } 1199 1200 void DeclContext::localUncachedLookup(DeclarationName Name, 1201 llvm::SmallVectorImpl<NamedDecl *> &Results) { 1202 Results.clear(); 1203 1204 // If there's no external storage, just perform a normal lookup and copy 1205 // the results. 1206 if (!hasExternalVisibleStorage() && !hasExternalLexicalStorage()) { 1207 lookup_result LookupResults = lookup(Name); 1208 Results.insert(Results.end(), LookupResults.first, LookupResults.second); 1209 return; 1210 } 1211 1212 // If we have a lookup table, check there first. Maybe we'll get lucky. 1213 if (StoredDeclsMap *Map = LookupPtr.getPointer()) { 1214 StoredDeclsMap::iterator Pos = Map->find(Name); 1215 if (Pos != Map->end()) { 1216 Results.insert(Results.end(), 1217 Pos->second.getLookupResult().first, 1218 Pos->second.getLookupResult().second); 1219 return; 1220 } 1221 } 1222 1223 // Slow case: grovel through the declarations in our chain looking for 1224 // matches. 1225 for (Decl *D = FirstDecl; D; D = D->getNextDeclInContext()) { 1226 if (NamedDecl *ND = dyn_cast<NamedDecl>(D)) 1227 if (ND->getDeclName() == Name) 1228 Results.push_back(ND); 1229 } 1230 } 1231 1232 DeclContext *DeclContext::getRedeclContext() { 1233 DeclContext *Ctx = this; 1234 // Skip through transparent contexts. 1235 while (Ctx->isTransparentContext()) 1236 Ctx = Ctx->getParent(); 1237 return Ctx; 1238 } 1239 1240 DeclContext *DeclContext::getEnclosingNamespaceContext() { 1241 DeclContext *Ctx = this; 1242 // Skip through non-namespace, non-translation-unit contexts. 1243 while (!Ctx->isFileContext()) 1244 Ctx = Ctx->getParent(); 1245 return Ctx->getPrimaryContext(); 1246 } 1247 1248 bool DeclContext::InEnclosingNamespaceSetOf(const DeclContext *O) const { 1249 // For non-file contexts, this is equivalent to Equals. 1250 if (!isFileContext()) 1251 return O->Equals(this); 1252 1253 do { 1254 if (O->Equals(this)) 1255 return true; 1256 1257 const NamespaceDecl *NS = dyn_cast<NamespaceDecl>(O); 1258 if (!NS || !NS->isInline()) 1259 break; 1260 O = NS->getParent(); 1261 } while (O); 1262 1263 return false; 1264 } 1265 1266 void DeclContext::makeDeclVisibleInContext(NamedDecl *D) { 1267 DeclContext *PrimaryDC = this->getPrimaryContext(); 1268 DeclContext *DeclDC = D->getDeclContext()->getPrimaryContext(); 1269 // If the decl is being added outside of its semantic decl context, we 1270 // need to ensure that we eagerly build the lookup information for it. 1271 PrimaryDC->makeDeclVisibleInContextWithFlags(D, false, PrimaryDC == DeclDC); 1272 } 1273 1274 void DeclContext::makeDeclVisibleInContextWithFlags(NamedDecl *D, bool Internal, 1275 bool Recoverable) { 1276 assert(this == getPrimaryContext() && "expected a primary DC"); 1277 1278 // Skip declarations within functions. 1279 // FIXME: We shouldn't need to build lookup tables for function declarations 1280 // ever, and we can't do so correctly because we can't model the nesting of 1281 // scopes which occurs within functions. We use "qualified" lookup into 1282 // function declarations when handling friend declarations inside nested 1283 // classes, and consequently accept the following invalid code: 1284 // 1285 // void f() { void g(); { int g; struct S { friend void g(); }; } } 1286 if (isFunctionOrMethod() && !isa<FunctionDecl>(D)) 1287 return; 1288 1289 // Skip declarations which should be invisible to name lookup. 1290 if (shouldBeHidden(D)) 1291 return; 1292 1293 // If we already have a lookup data structure, perform the insertion into 1294 // it. If we might have externally-stored decls with this name, look them 1295 // up and perform the insertion. If this decl was declared outside its 1296 // semantic context, buildLookup won't add it, so add it now. 1297 // 1298 // FIXME: As a performance hack, don't add such decls into the translation 1299 // unit unless we're in C++, since qualified lookup into the TU is never 1300 // performed. 1301 if (LookupPtr.getPointer() || hasExternalVisibleStorage() || 1302 ((!Recoverable || D->getDeclContext() != D->getLexicalDeclContext()) && 1303 (getParentASTContext().getLangOpts().CPlusPlus || 1304 !isTranslationUnit()))) { 1305 // If we have lazily omitted any decls, they might have the same name as 1306 // the decl which we are adding, so build a full lookup table before adding 1307 // this decl. 1308 buildLookup(); 1309 makeDeclVisibleInContextImpl(D, Internal); 1310 } else { 1311 LookupPtr.setInt(true); 1312 } 1313 1314 // If we are a transparent context or inline namespace, insert into our 1315 // parent context, too. This operation is recursive. 1316 if (isTransparentContext() || isInlineNamespace()) 1317 getParent()->getPrimaryContext()-> 1318 makeDeclVisibleInContextWithFlags(D, Internal, Recoverable); 1319 1320 Decl *DCAsDecl = cast<Decl>(this); 1321 // Notify that a decl was made visible unless we are a Tag being defined. 1322 if (!(isa<TagDecl>(DCAsDecl) && cast<TagDecl>(DCAsDecl)->isBeingDefined())) 1323 if (ASTMutationListener *L = DCAsDecl->getASTMutationListener()) 1324 L->AddedVisibleDecl(this, D); 1325 } 1326 1327 void DeclContext::makeDeclVisibleInContextImpl(NamedDecl *D, bool Internal) { 1328 // Find or create the stored declaration map. 1329 StoredDeclsMap *Map = LookupPtr.getPointer(); 1330 if (!Map) { 1331 ASTContext *C = &getParentASTContext(); 1332 Map = CreateStoredDeclsMap(*C); 1333 } 1334 1335 // If there is an external AST source, load any declarations it knows about 1336 // with this declaration's name. 1337 // If the lookup table contains an entry about this name it means that we 1338 // have already checked the external source. 1339 if (!Internal) 1340 if (ExternalASTSource *Source = getParentASTContext().getExternalSource()) 1341 if (hasExternalVisibleStorage() && 1342 Map->find(D->getDeclName()) == Map->end()) 1343 Source->FindExternalVisibleDeclsByName(this, D->getDeclName()); 1344 1345 // Insert this declaration into the map. 1346 StoredDeclsList &DeclNameEntries = (*Map)[D->getDeclName()]; 1347 if (DeclNameEntries.isNull()) { 1348 DeclNameEntries.setOnlyValue(D); 1349 return; 1350 } 1351 1352 if (DeclNameEntries.HandleRedeclaration(D)) { 1353 // This declaration has replaced an existing one for which 1354 // declarationReplaces returns true. 1355 return; 1356 } 1357 1358 // Put this declaration into the appropriate slot. 1359 DeclNameEntries.AddSubsequentDecl(D); 1360 } 1361 1362 /// Returns iterator range [First, Last) of UsingDirectiveDecls stored within 1363 /// this context. 1364 DeclContext::udir_iterator_range 1365 DeclContext::getUsingDirectives() const { 1366 // FIXME: Use something more efficient than normal lookup for using 1367 // directives. In C++, using directives are looked up more than anything else. 1368 lookup_const_result Result = lookup(UsingDirectiveDecl::getName()); 1369 return udir_iterator_range(reinterpret_cast<udir_iterator>(Result.first), 1370 reinterpret_cast<udir_iterator>(Result.second)); 1371 } 1372 1373 //===----------------------------------------------------------------------===// 1374 // Creation and Destruction of StoredDeclsMaps. // 1375 //===----------------------------------------------------------------------===// 1376 1377 StoredDeclsMap *DeclContext::CreateStoredDeclsMap(ASTContext &C) const { 1378 assert(!LookupPtr.getPointer() && "context already has a decls map"); 1379 assert(getPrimaryContext() == this && 1380 "creating decls map on non-primary context"); 1381 1382 StoredDeclsMap *M; 1383 bool Dependent = isDependentContext(); 1384 if (Dependent) 1385 M = new DependentStoredDeclsMap(); 1386 else 1387 M = new StoredDeclsMap(); 1388 M->Previous = C.LastSDM; 1389 C.LastSDM = llvm::PointerIntPair<StoredDeclsMap*,1>(M, Dependent); 1390 LookupPtr.setPointer(M); 1391 return M; 1392 } 1393 1394 void ASTContext::ReleaseDeclContextMaps() { 1395 // It's okay to delete DependentStoredDeclsMaps via a StoredDeclsMap 1396 // pointer because the subclass doesn't add anything that needs to 1397 // be deleted. 1398 StoredDeclsMap::DestroyAll(LastSDM.getPointer(), LastSDM.getInt()); 1399 } 1400 1401 void StoredDeclsMap::DestroyAll(StoredDeclsMap *Map, bool Dependent) { 1402 while (Map) { 1403 // Advance the iteration before we invalidate memory. 1404 llvm::PointerIntPair<StoredDeclsMap*,1> Next = Map->Previous; 1405 1406 if (Dependent) 1407 delete static_cast<DependentStoredDeclsMap*>(Map); 1408 else 1409 delete Map; 1410 1411 Map = Next.getPointer(); 1412 Dependent = Next.getInt(); 1413 } 1414 } 1415 1416 DependentDiagnostic *DependentDiagnostic::Create(ASTContext &C, 1417 DeclContext *Parent, 1418 const PartialDiagnostic &PDiag) { 1419 assert(Parent->isDependentContext() 1420 && "cannot iterate dependent diagnostics of non-dependent context"); 1421 Parent = Parent->getPrimaryContext(); 1422 if (!Parent->LookupPtr.getPointer()) 1423 Parent->CreateStoredDeclsMap(C); 1424 1425 DependentStoredDeclsMap *Map 1426 = static_cast<DependentStoredDeclsMap*>(Parent->LookupPtr.getPointer()); 1427 1428 // Allocate the copy of the PartialDiagnostic via the ASTContext's 1429 // BumpPtrAllocator, rather than the ASTContext itself. 1430 PartialDiagnostic::Storage *DiagStorage = 0; 1431 if (PDiag.hasStorage()) 1432 DiagStorage = new (C) PartialDiagnostic::Storage; 1433 1434 DependentDiagnostic *DD = new (C) DependentDiagnostic(PDiag, DiagStorage); 1435 1436 // TODO: Maybe we shouldn't reverse the order during insertion. 1437 DD->NextDiagnostic = Map->FirstDiagnostic; 1438 Map->FirstDiagnostic = DD; 1439 1440 return DD; 1441 } 1442