DeclBase.cpp revision 7b3f853c6f684c1df423e994482681844c396342
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#include <cstdio> 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// Statistics 37//===----------------------------------------------------------------------===// 38 39#define DECL(DERIVED, BASE) static int n##DERIVED##s = 0; 40#define ABSTRACT_DECL(DECL) 41#include "clang/AST/DeclNodes.inc" 42 43static bool StatSwitch = false; 44 45const char *Decl::getDeclKindName() const { 46 switch (DeclKind) { 47 default: assert(0 && "Declaration not in DeclNodes.inc!"); 48#define DECL(DERIVED, BASE) case DERIVED: return #DERIVED; 49#define ABSTRACT_DECL(DECL) 50#include "clang/AST/DeclNodes.inc" 51 } 52} 53 54void Decl::setInvalidDecl(bool Invalid) { 55 InvalidDecl = Invalid; 56 if (Invalid) { 57 // Defensive maneuver for ill-formed code: we're likely not to make it to 58 // a point where we set the access specifier, so default it to "public" 59 // to avoid triggering asserts elsewhere in the front end. 60 setAccess(AS_public); 61 } 62} 63 64const char *DeclContext::getDeclKindName() const { 65 switch (DeclKind) { 66 default: assert(0 && "Declaration context not in DeclNodes.inc!"); 67#define DECL(DERIVED, BASE) case Decl::DERIVED: return #DERIVED; 68#define ABSTRACT_DECL(DECL) 69#include "clang/AST/DeclNodes.inc" 70 } 71} 72 73bool Decl::CollectingStats(bool Enable) { 74 if (Enable) StatSwitch = true; 75 return StatSwitch; 76} 77 78void Decl::PrintStats() { 79 fprintf(stderr, "*** Decl Stats:\n"); 80 81 int totalDecls = 0; 82#define DECL(DERIVED, BASE) totalDecls += n##DERIVED##s; 83#define ABSTRACT_DECL(DECL) 84#include "clang/AST/DeclNodes.inc" 85 fprintf(stderr, " %d decls total.\n", totalDecls); 86 87 int totalBytes = 0; 88#define DECL(DERIVED, BASE) \ 89 if (n##DERIVED##s > 0) { \ 90 totalBytes += (int)(n##DERIVED##s * sizeof(DERIVED##Decl)); \ 91 fprintf(stderr, " %d " #DERIVED " decls, %d each (%d bytes)\n", \ 92 n##DERIVED##s, (int)sizeof(DERIVED##Decl), \ 93 (int)(n##DERIVED##s * sizeof(DERIVED##Decl))); \ 94 } 95#define ABSTRACT_DECL(DECL) 96#include "clang/AST/DeclNodes.inc" 97 98 fprintf(stderr, "Total bytes = %d\n", totalBytes); 99} 100 101void Decl::add(Kind k) { 102 switch (k) { 103 default: assert(0 && "Declaration not in DeclNodes.inc!"); 104#define DECL(DERIVED, BASE) case DERIVED: ++n##DERIVED##s; break; 105#define ABSTRACT_DECL(DECL) 106#include "clang/AST/DeclNodes.inc" 107 } 108} 109 110bool Decl::isTemplateParameterPack() const { 111 if (const TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(this)) 112 return TTP->isParameterPack(); 113 if (const NonTypeTemplateParmDecl *NTTP 114 = dyn_cast<NonTypeTemplateParmDecl>(this)) 115 return NTTP->isParameterPack(); 116 if (const TemplateTemplateParmDecl *TTP 117 = dyn_cast<TemplateTemplateParmDecl>(this)) 118 return TTP->isParameterPack(); 119 return false; 120} 121 122bool Decl::isParameterPack() const { 123 if (const ParmVarDecl *Parm = dyn_cast<ParmVarDecl>(this)) 124 return Parm->isParameterPack(); 125 126 return isTemplateParameterPack(); 127} 128 129bool Decl::isFunctionOrFunctionTemplate() const { 130 if (const UsingShadowDecl *UD = dyn_cast<UsingShadowDecl>(this)) 131 return UD->getTargetDecl()->isFunctionOrFunctionTemplate(); 132 133 return isa<FunctionDecl>(this) || isa<FunctionTemplateDecl>(this); 134} 135 136bool Decl::isDefinedOutsideFunctionOrMethod() const { 137 for (const DeclContext *DC = getDeclContext(); 138 DC && !DC->isTranslationUnit(); 139 DC = DC->getParent()) 140 if (DC->isFunctionOrMethod()) 141 return false; 142 143 return true; 144} 145 146 147//===----------------------------------------------------------------------===// 148// PrettyStackTraceDecl Implementation 149//===----------------------------------------------------------------------===// 150 151void PrettyStackTraceDecl::print(llvm::raw_ostream &OS) const { 152 SourceLocation TheLoc = Loc; 153 if (TheLoc.isInvalid() && TheDecl) 154 TheLoc = TheDecl->getLocation(); 155 156 if (TheLoc.isValid()) { 157 TheLoc.print(OS, SM); 158 OS << ": "; 159 } 160 161 OS << Message; 162 163 if (const NamedDecl *DN = dyn_cast_or_null<NamedDecl>(TheDecl)) 164 OS << " '" << DN->getQualifiedNameAsString() << '\''; 165 OS << '\n'; 166} 167 168//===----------------------------------------------------------------------===// 169// Decl Implementation 170//===----------------------------------------------------------------------===// 171 172// Out-of-line virtual method providing a home for Decl. 173Decl::~Decl() { } 174 175void Decl::setDeclContext(DeclContext *DC) { 176 DeclCtx = DC; 177} 178 179void Decl::setLexicalDeclContext(DeclContext *DC) { 180 if (DC == getLexicalDeclContext()) 181 return; 182 183 if (isInSemaDC()) { 184 MultipleDC *MDC = new (getASTContext()) MultipleDC(); 185 MDC->SemanticDC = getDeclContext(); 186 MDC->LexicalDC = DC; 187 DeclCtx = MDC; 188 } else { 189 getMultipleDC()->LexicalDC = DC; 190 } 191} 192 193bool Decl::isInAnonymousNamespace() const { 194 const DeclContext *DC = getDeclContext(); 195 do { 196 if (const NamespaceDecl *ND = dyn_cast<NamespaceDecl>(DC)) 197 if (ND->isAnonymousNamespace()) 198 return true; 199 } while ((DC = DC->getParent())); 200 201 return false; 202} 203 204TranslationUnitDecl *Decl::getTranslationUnitDecl() { 205 if (TranslationUnitDecl *TUD = dyn_cast<TranslationUnitDecl>(this)) 206 return TUD; 207 208 DeclContext *DC = getDeclContext(); 209 assert(DC && "This decl is not contained in a translation unit!"); 210 211 while (!DC->isTranslationUnit()) { 212 DC = DC->getParent(); 213 assert(DC && "This decl is not contained in a translation unit!"); 214 } 215 216 return cast<TranslationUnitDecl>(DC); 217} 218 219ASTContext &Decl::getASTContext() const { 220 return getTranslationUnitDecl()->getASTContext(); 221} 222 223ASTMutationListener *Decl::getASTMutationListener() const { 224 return getASTContext().getASTMutationListener(); 225} 226 227bool Decl::isUsed(bool CheckUsedAttr) const { 228 if (Used) 229 return true; 230 231 // Check for used attribute. 232 if (CheckUsedAttr && hasAttr<UsedAttr>()) 233 return true; 234 235 // Check redeclarations for used attribute. 236 for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) { 237 if ((CheckUsedAttr && I->hasAttr<UsedAttr>()) || I->Used) 238 return true; 239 } 240 241 return false; 242} 243 244bool Decl::isReferenced() const { 245 if (Referenced) 246 return true; 247 248 // Check redeclarations. 249 for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) 250 if (I->Referenced) 251 return true; 252 253 return false; 254} 255 256/// \brief Determine the availability of the given declaration based on 257/// the target platform. 258/// 259/// When it returns an availability result other than \c AR_Available, 260/// if the \p Message parameter is non-NULL, it will be set to a 261/// string describing why the entity is unavailable. 262/// 263/// FIXME: Make these strings localizable, since they end up in 264/// diagnostics. 265static AvailabilityResult CheckAvailability(ASTContext &Context, 266 const AvailabilityAttr *A, 267 std::string *Message) { 268 llvm::StringRef TargetPlatform = Context.Target.getPlatformName(); 269 llvm::StringRef PrettyPlatformName 270 = AvailabilityAttr::getPrettyPlatformName(TargetPlatform); 271 if (PrettyPlatformName.empty()) 272 PrettyPlatformName = TargetPlatform; 273 274 VersionTuple TargetMinVersion = Context.Target.getPlatformMinVersion(); 275 if (TargetMinVersion.empty()) 276 return AR_Available; 277 278 // Match the platform name. 279 if (A->getPlatform()->getName() != TargetPlatform) 280 return AR_Available; 281 282 // Make sure that this declaration has not been marked 'unavailable'. 283 if (A->getUnavailable()) { 284 if (Message) { 285 Message->clear(); 286 llvm::raw_string_ostream Out(*Message); 287 Out << "not available on " << PrettyPlatformName; 288 } 289 290 return AR_Unavailable; 291 } 292 293 // Make sure that this declaration has already been introduced. 294 if (!A->getIntroduced().empty() && 295 TargetMinVersion < A->getIntroduced()) { 296 if (Message) { 297 Message->clear(); 298 llvm::raw_string_ostream Out(*Message); 299 Out << "introduced in " << PrettyPlatformName << ' ' 300 << A->getIntroduced(); 301 } 302 303 return AR_NotYetIntroduced; 304 } 305 306 // Make sure that this declaration hasn't been obsoleted. 307 if (!A->getObsoleted().empty() && TargetMinVersion >= A->getObsoleted()) { 308 if (Message) { 309 Message->clear(); 310 llvm::raw_string_ostream Out(*Message); 311 Out << "obsoleted in " << PrettyPlatformName << ' ' 312 << A->getObsoleted(); 313 } 314 315 return AR_Unavailable; 316 } 317 318 // Make sure that this declaration hasn't been deprecated. 319 if (!A->getDeprecated().empty() && TargetMinVersion >= A->getDeprecated()) { 320 if (Message) { 321 Message->clear(); 322 llvm::raw_string_ostream Out(*Message); 323 Out << "first deprecated in " << PrettyPlatformName << ' ' 324 << A->getDeprecated(); 325 } 326 327 return AR_Deprecated; 328 } 329 330 return AR_Available; 331} 332 333AvailabilityResult Decl::getAvailability(std::string *Message) const { 334 AvailabilityResult Result = AR_Available; 335 std::string ResultMessage; 336 337 for (attr_iterator A = attr_begin(), AEnd = attr_end(); A != AEnd; ++A) { 338 if (DeprecatedAttr *Deprecated = dyn_cast<DeprecatedAttr>(*A)) { 339 if (Result >= AR_Deprecated) 340 continue; 341 342 if (Message) 343 ResultMessage = Deprecated->getMessage(); 344 345 Result = AR_Deprecated; 346 continue; 347 } 348 349 if (UnavailableAttr *Unavailable = dyn_cast<UnavailableAttr>(*A)) { 350 if (Message) 351 *Message = Unavailable->getMessage(); 352 return AR_Unavailable; 353 } 354 355 if (AvailabilityAttr *Availability = dyn_cast<AvailabilityAttr>(*A)) { 356 AvailabilityResult AR = CheckAvailability(getASTContext(), Availability, 357 Message); 358 359 if (AR == AR_Unavailable) 360 return AR_Unavailable; 361 362 if (AR > Result) { 363 Result = AR; 364 if (Message) 365 ResultMessage.swap(*Message); 366 } 367 continue; 368 } 369 } 370 371 if (Message) 372 Message->swap(ResultMessage); 373 return Result; 374} 375 376bool Decl::canBeWeakImported(bool &IsDefinition) const { 377 IsDefinition = false; 378 if (const VarDecl *Var = dyn_cast<VarDecl>(this)) { 379 if (!Var->hasExternalStorage() || Var->getInit()) { 380 IsDefinition = true; 381 return false; 382 } 383 } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(this)) { 384 if (FD->hasBody()) { 385 IsDefinition = true; 386 return false; 387 } 388 } else if (isa<ObjCPropertyDecl>(this) || isa<ObjCMethodDecl>(this)) 389 return false; 390 else if (!(getASTContext().getLangOptions().ObjCNonFragileABI && 391 isa<ObjCInterfaceDecl>(this))) 392 return false; 393 394 return true; 395} 396 397bool Decl::isWeakImported() const { 398 bool IsDefinition; 399 if (!canBeWeakImported(IsDefinition)) 400 return false; 401 402 for (attr_iterator A = attr_begin(), AEnd = attr_end(); A != AEnd; ++A) { 403 if (isa<WeakImportAttr>(*A)) 404 return true; 405 406 if (AvailabilityAttr *Availability = dyn_cast<AvailabilityAttr>(*A)) { 407 if (CheckAvailability(getASTContext(), Availability, 0) 408 == AR_NotYetIntroduced) 409 return true; 410 } 411 } 412 413 return false; 414} 415 416unsigned Decl::getIdentifierNamespaceForKind(Kind DeclKind) { 417 switch (DeclKind) { 418 case Function: 419 case CXXMethod: 420 case CXXConstructor: 421 case CXXDestructor: 422 case CXXConversion: 423 case EnumConstant: 424 case Var: 425 case ImplicitParam: 426 case ParmVar: 427 case NonTypeTemplateParm: 428 case ObjCMethod: 429 case ObjCProperty: 430 return IDNS_Ordinary; 431 case Label: 432 return IDNS_Label; 433 case IndirectField: 434 return IDNS_Ordinary | IDNS_Member; 435 436 case ObjCCompatibleAlias: 437 case ObjCInterface: 438 return IDNS_Ordinary | IDNS_Type; 439 440 case Typedef: 441 case TypeAlias: 442 case TypeAliasTemplate: 443 case UnresolvedUsingTypename: 444 case TemplateTypeParm: 445 return IDNS_Ordinary | IDNS_Type; 446 447 case UsingShadow: 448 return 0; // we'll actually overwrite this later 449 450 case UnresolvedUsingValue: 451 return IDNS_Ordinary | IDNS_Using; 452 453 case Using: 454 return IDNS_Using; 455 456 case ObjCProtocol: 457 return IDNS_ObjCProtocol; 458 459 case Field: 460 case ObjCAtDefsField: 461 case ObjCIvar: 462 return IDNS_Member; 463 464 case Record: 465 case CXXRecord: 466 case Enum: 467 return IDNS_Tag | IDNS_Type; 468 469 case Namespace: 470 case NamespaceAlias: 471 return IDNS_Namespace; 472 473 case FunctionTemplate: 474 return IDNS_Ordinary; 475 476 case ClassTemplate: 477 case TemplateTemplateParm: 478 return IDNS_Ordinary | IDNS_Tag | IDNS_Type; 479 480 // Never have names. 481 case Friend: 482 case FriendTemplate: 483 case AccessSpec: 484 case LinkageSpec: 485 case FileScopeAsm: 486 case StaticAssert: 487 case ObjCClass: 488 case ObjCPropertyImpl: 489 case ObjCForwardProtocol: 490 case Block: 491 case TranslationUnit: 492 493 case UsingDirective: 494 case ClassTemplateSpecialization: 495 case ClassTemplatePartialSpecialization: 496 case ObjCImplementation: 497 case ObjCCategory: 498 case ObjCCategoryImpl: 499 // Never looked up by name. 500 return 0; 501 } 502 503 return 0; 504} 505 506void Decl::setAttrs(const AttrVec &attrs) { 507 assert(!HasAttrs && "Decl already contains attrs."); 508 509 AttrVec &AttrBlank = getASTContext().getDeclAttrs(this); 510 assert(AttrBlank.empty() && "HasAttrs was wrong?"); 511 512 AttrBlank = attrs; 513 HasAttrs = true; 514} 515 516void Decl::dropAttrs() { 517 if (!HasAttrs) return; 518 519 HasAttrs = false; 520 getASTContext().eraseDeclAttrs(this); 521} 522 523const AttrVec &Decl::getAttrs() const { 524 assert(HasAttrs && "No attrs to get!"); 525 return getASTContext().getDeclAttrs(this); 526} 527 528void Decl::swapAttrs(Decl *RHS) { 529 bool HasLHSAttr = this->HasAttrs; 530 bool HasRHSAttr = RHS->HasAttrs; 531 532 // Usually, neither decl has attrs, nothing to do. 533 if (!HasLHSAttr && !HasRHSAttr) return; 534 535 // If 'this' has no attrs, swap the other way. 536 if (!HasLHSAttr) 537 return RHS->swapAttrs(this); 538 539 ASTContext &Context = getASTContext(); 540 541 // Handle the case when both decls have attrs. 542 if (HasRHSAttr) { 543 std::swap(Context.getDeclAttrs(this), Context.getDeclAttrs(RHS)); 544 return; 545 } 546 547 // Otherwise, LHS has an attr and RHS doesn't. 548 Context.getDeclAttrs(RHS) = Context.getDeclAttrs(this); 549 Context.eraseDeclAttrs(this); 550 this->HasAttrs = false; 551 RHS->HasAttrs = true; 552} 553 554Decl *Decl::castFromDeclContext (const DeclContext *D) { 555 Decl::Kind DK = D->getDeclKind(); 556 switch(DK) { 557#define DECL(NAME, BASE) 558#define DECL_CONTEXT(NAME) \ 559 case Decl::NAME: \ 560 return static_cast<NAME##Decl*>(const_cast<DeclContext*>(D)); 561#define DECL_CONTEXT_BASE(NAME) 562#include "clang/AST/DeclNodes.inc" 563 default: 564#define DECL(NAME, BASE) 565#define DECL_CONTEXT_BASE(NAME) \ 566 if (DK >= first##NAME && DK <= last##NAME) \ 567 return static_cast<NAME##Decl*>(const_cast<DeclContext*>(D)); 568#include "clang/AST/DeclNodes.inc" 569 assert(false && "a decl that inherits DeclContext isn't handled"); 570 return 0; 571 } 572} 573 574DeclContext *Decl::castToDeclContext(const Decl *D) { 575 Decl::Kind DK = D->getKind(); 576 switch(DK) { 577#define DECL(NAME, BASE) 578#define DECL_CONTEXT(NAME) \ 579 case Decl::NAME: \ 580 return static_cast<NAME##Decl*>(const_cast<Decl*>(D)); 581#define DECL_CONTEXT_BASE(NAME) 582#include "clang/AST/DeclNodes.inc" 583 default: 584#define DECL(NAME, BASE) 585#define DECL_CONTEXT_BASE(NAME) \ 586 if (DK >= first##NAME && DK <= last##NAME) \ 587 return static_cast<NAME##Decl*>(const_cast<Decl*>(D)); 588#include "clang/AST/DeclNodes.inc" 589 assert(false && "a decl that inherits DeclContext isn't handled"); 590 return 0; 591 } 592} 593 594SourceLocation Decl::getBodyRBrace() const { 595 // Special handling of FunctionDecl to avoid de-serializing the body from PCH. 596 // FunctionDecl stores EndRangeLoc for this purpose. 597 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(this)) { 598 const FunctionDecl *Definition; 599 if (FD->hasBody(Definition)) 600 return Definition->getSourceRange().getEnd(); 601 return SourceLocation(); 602 } 603 604 if (Stmt *Body = getBody()) 605 return Body->getSourceRange().getEnd(); 606 607 return SourceLocation(); 608} 609 610void Decl::CheckAccessDeclContext() const { 611#ifndef NDEBUG 612 // Suppress this check if any of the following hold: 613 // 1. this is the translation unit (and thus has no parent) 614 // 2. this is a template parameter (and thus doesn't belong to its context) 615 // 3. this is a non-type template parameter 616 // 4. the context is not a record 617 // 5. it's invalid 618 // 6. it's a C++0x static_assert. 619 if (isa<TranslationUnitDecl>(this) || 620 isa<TemplateTypeParmDecl>(this) || 621 isa<NonTypeTemplateParmDecl>(this) || 622 !isa<CXXRecordDecl>(getDeclContext()) || 623 isInvalidDecl() || 624 isa<StaticAssertDecl>(this) || 625 // FIXME: a ParmVarDecl can have ClassTemplateSpecialization 626 // as DeclContext (?). 627 isa<ParmVarDecl>(this) || 628 // FIXME: a ClassTemplateSpecialization or CXXRecordDecl can have 629 // AS_none as access specifier. 630 isa<CXXRecordDecl>(this)) 631 return; 632 633 assert(Access != AS_none && 634 "Access specifier is AS_none inside a record decl"); 635#endif 636} 637 638DeclContext *Decl::getNonClosureContext() { 639 DeclContext *DC = getDeclContext(); 640 641 // This is basically "while (DC->isClosure()) DC = DC->getParent();" 642 // except that it's significantly more efficient to cast to a known 643 // decl type and call getDeclContext() than to call getParent(). 644 while (isa<BlockDecl>(DC)) 645 DC = cast<BlockDecl>(DC)->getDeclContext(); 646 647 assert(!DC->isClosure()); 648 return DC; 649} 650 651//===----------------------------------------------------------------------===// 652// DeclContext Implementation 653//===----------------------------------------------------------------------===// 654 655bool DeclContext::classof(const Decl *D) { 656 switch (D->getKind()) { 657#define DECL(NAME, BASE) 658#define DECL_CONTEXT(NAME) case Decl::NAME: 659#define DECL_CONTEXT_BASE(NAME) 660#include "clang/AST/DeclNodes.inc" 661 return true; 662 default: 663#define DECL(NAME, BASE) 664#define DECL_CONTEXT_BASE(NAME) \ 665 if (D->getKind() >= Decl::first##NAME && \ 666 D->getKind() <= Decl::last##NAME) \ 667 return true; 668#include "clang/AST/DeclNodes.inc" 669 return false; 670 } 671} 672 673DeclContext::~DeclContext() { } 674 675/// \brief Find the parent context of this context that will be 676/// used for unqualified name lookup. 677/// 678/// Generally, the parent lookup context is the semantic context. However, for 679/// a friend function the parent lookup context is the lexical context, which 680/// is the class in which the friend is declared. 681DeclContext *DeclContext::getLookupParent() { 682 // FIXME: Find a better way to identify friends 683 if (isa<FunctionDecl>(this)) 684 if (getParent()->getRedeclContext()->isFileContext() && 685 getLexicalParent()->getRedeclContext()->isRecord()) 686 return getLexicalParent(); 687 688 return getParent(); 689} 690 691bool DeclContext::isInlineNamespace() const { 692 return isNamespace() && 693 cast<NamespaceDecl>(this)->isInline(); 694} 695 696bool DeclContext::isDependentContext() const { 697 if (isFileContext()) 698 return false; 699 700 if (isa<ClassTemplatePartialSpecializationDecl>(this)) 701 return true; 702 703 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(this)) 704 if (Record->getDescribedClassTemplate()) 705 return true; 706 707 if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(this)) { 708 if (Function->getDescribedFunctionTemplate()) 709 return true; 710 711 // Friend function declarations are dependent if their *lexical* 712 // context is dependent. 713 if (cast<Decl>(this)->getFriendObjectKind()) 714 return getLexicalParent()->isDependentContext(); 715 } 716 717 return getParent() && getParent()->isDependentContext(); 718} 719 720bool DeclContext::isTransparentContext() const { 721 if (DeclKind == Decl::Enum) 722 return !cast<EnumDecl>(this)->isScoped(); 723 else if (DeclKind == Decl::LinkageSpec) 724 return true; 725 726 return false; 727} 728 729bool DeclContext::isExternCContext() const { 730 const DeclContext *DC = this; 731 while (DC->DeclKind != Decl::TranslationUnit) { 732 if (DC->DeclKind == Decl::LinkageSpec) 733 return cast<LinkageSpecDecl>(DC)->getLanguage() 734 == LinkageSpecDecl::lang_c; 735 DC = DC->getParent(); 736 } 737 return false; 738} 739 740bool DeclContext::Encloses(const DeclContext *DC) const { 741 if (getPrimaryContext() != this) 742 return getPrimaryContext()->Encloses(DC); 743 744 for (; DC; DC = DC->getParent()) 745 if (DC->getPrimaryContext() == this) 746 return true; 747 return false; 748} 749 750DeclContext *DeclContext::getPrimaryContext() { 751 switch (DeclKind) { 752 case Decl::TranslationUnit: 753 case Decl::LinkageSpec: 754 case Decl::Block: 755 // There is only one DeclContext for these entities. 756 return this; 757 758 case Decl::Namespace: 759 // The original namespace is our primary context. 760 return static_cast<NamespaceDecl*>(this)->getOriginalNamespace(); 761 762 case Decl::ObjCMethod: 763 return this; 764 765 case Decl::ObjCInterface: 766 case Decl::ObjCProtocol: 767 case Decl::ObjCCategory: 768 // FIXME: Can Objective-C interfaces be forward-declared? 769 return this; 770 771 case Decl::ObjCImplementation: 772 case Decl::ObjCCategoryImpl: 773 return this; 774 775 default: 776 if (DeclKind >= Decl::firstTag && DeclKind <= Decl::lastTag) { 777 // If this is a tag type that has a definition or is currently 778 // being defined, that definition is our primary context. 779 TagDecl *Tag = cast<TagDecl>(this); 780 assert(isa<TagType>(Tag->TypeForDecl) || 781 isa<InjectedClassNameType>(Tag->TypeForDecl)); 782 783 if (TagDecl *Def = Tag->getDefinition()) 784 return Def; 785 786 if (!isa<InjectedClassNameType>(Tag->TypeForDecl)) { 787 const TagType *TagTy = cast<TagType>(Tag->TypeForDecl); 788 if (TagTy->isBeingDefined()) 789 // FIXME: is it necessarily being defined in the decl 790 // that owns the type? 791 return TagTy->getDecl(); 792 } 793 794 return Tag; 795 } 796 797 assert(DeclKind >= Decl::firstFunction && DeclKind <= Decl::lastFunction && 798 "Unknown DeclContext kind"); 799 return this; 800 } 801} 802 803DeclContext *DeclContext::getNextContext() { 804 switch (DeclKind) { 805 case Decl::Namespace: 806 // Return the next namespace 807 return static_cast<NamespaceDecl*>(this)->getNextNamespace(); 808 809 default: 810 return 0; 811 } 812} 813 814std::pair<Decl *, Decl *> 815DeclContext::BuildDeclChain(const llvm::SmallVectorImpl<Decl*> &Decls) { 816 // Build up a chain of declarations via the Decl::NextDeclInContext field. 817 Decl *FirstNewDecl = 0; 818 Decl *PrevDecl = 0; 819 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 820 Decl *D = Decls[I]; 821 if (PrevDecl) 822 PrevDecl->NextDeclInContext = D; 823 else 824 FirstNewDecl = D; 825 826 PrevDecl = D; 827 } 828 829 return std::make_pair(FirstNewDecl, PrevDecl); 830} 831 832/// \brief Load the declarations within this lexical storage from an 833/// external source. 834void 835DeclContext::LoadLexicalDeclsFromExternalStorage() const { 836 ExternalASTSource *Source = getParentASTContext().getExternalSource(); 837 assert(hasExternalLexicalStorage() && Source && "No external storage?"); 838 839 // Notify that we have a DeclContext that is initializing. 840 ExternalASTSource::Deserializing ADeclContext(Source); 841 842 llvm::SmallVector<Decl*, 64> Decls; 843 if (Source->FindExternalLexicalDecls(this, Decls)) 844 return; 845 846 // There is no longer any lexical storage in this context 847 ExternalLexicalStorage = false; 848 849 if (Decls.empty()) 850 return; 851 852 // We may have already loaded just the fields of this record, in which case 853 // don't add the decls, just replace the FirstDecl/LastDecl chain. 854 if (const RecordDecl *RD = dyn_cast<RecordDecl>(this)) 855 if (RD->LoadedFieldsFromExternalStorage) { 856 llvm::tie(FirstDecl, LastDecl) = BuildDeclChain(Decls); 857 return; 858 } 859 860 // Splice the newly-read declarations into the beginning of the list 861 // of declarations. 862 Decl *ExternalFirst, *ExternalLast; 863 llvm::tie(ExternalFirst, ExternalLast) = BuildDeclChain(Decls); 864 ExternalLast->NextDeclInContext = FirstDecl; 865 FirstDecl = ExternalFirst; 866 if (!LastDecl) 867 LastDecl = ExternalLast; 868} 869 870DeclContext::lookup_result 871ExternalASTSource::SetNoExternalVisibleDeclsForName(const DeclContext *DC, 872 DeclarationName Name) { 873 ASTContext &Context = DC->getParentASTContext(); 874 StoredDeclsMap *Map; 875 if (!(Map = DC->LookupPtr)) 876 Map = DC->CreateStoredDeclsMap(Context); 877 878 StoredDeclsList &List = (*Map)[Name]; 879 assert(List.isNull()); 880 (void) List; 881 882 return DeclContext::lookup_result(); 883} 884 885DeclContext::lookup_result 886ExternalASTSource::SetExternalVisibleDeclsForName(const DeclContext *DC, 887 DeclarationName Name, 888 llvm::SmallVectorImpl<NamedDecl*> &Decls) { 889 ASTContext &Context = DC->getParentASTContext();; 890 891 StoredDeclsMap *Map; 892 if (!(Map = DC->LookupPtr)) 893 Map = DC->CreateStoredDeclsMap(Context); 894 895 StoredDeclsList &List = (*Map)[Name]; 896 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 897 if (List.isNull()) 898 List.setOnlyValue(Decls[I]); 899 else 900 List.AddSubsequentDecl(Decls[I]); 901 } 902 903 return List.getLookupResult(); 904} 905 906void ExternalASTSource::MaterializeVisibleDeclsForName(const DeclContext *DC, 907 DeclarationName Name, 908 llvm::SmallVectorImpl<NamedDecl*> &Decls) { 909 assert(DC->LookupPtr); 910 StoredDeclsMap &Map = *DC->LookupPtr; 911 912 // If there's an entry in the table the visible decls for this name have 913 // already been deserialized. 914 if (Map.find(Name) == Map.end()) { 915 StoredDeclsList &List = Map[Name]; 916 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 917 if (List.isNull()) 918 List.setOnlyValue(Decls[I]); 919 else 920 List.AddSubsequentDecl(Decls[I]); 921 } 922 } 923} 924 925DeclContext::decl_iterator DeclContext::noload_decls_begin() const { 926 return decl_iterator(FirstDecl); 927} 928 929DeclContext::decl_iterator DeclContext::noload_decls_end() const { 930 return decl_iterator(); 931} 932 933DeclContext::decl_iterator DeclContext::decls_begin() const { 934 if (hasExternalLexicalStorage()) 935 LoadLexicalDeclsFromExternalStorage(); 936 937 // FIXME: Check whether we need to load some declarations from 938 // external storage. 939 return decl_iterator(FirstDecl); 940} 941 942DeclContext::decl_iterator DeclContext::decls_end() const { 943 if (hasExternalLexicalStorage()) 944 LoadLexicalDeclsFromExternalStorage(); 945 946 return decl_iterator(); 947} 948 949bool DeclContext::decls_empty() const { 950 if (hasExternalLexicalStorage()) 951 LoadLexicalDeclsFromExternalStorage(); 952 953 return !FirstDecl; 954} 955 956void DeclContext::removeDecl(Decl *D) { 957 assert(D->getLexicalDeclContext() == this && 958 "decl being removed from non-lexical context"); 959 assert((D->NextDeclInContext || D == LastDecl) && 960 "decl is not in decls list"); 961 962 // Remove D from the decl chain. This is O(n) but hopefully rare. 963 if (D == FirstDecl) { 964 if (D == LastDecl) 965 FirstDecl = LastDecl = 0; 966 else 967 FirstDecl = D->NextDeclInContext; 968 } else { 969 for (Decl *I = FirstDecl; true; I = I->NextDeclInContext) { 970 assert(I && "decl not found in linked list"); 971 if (I->NextDeclInContext == D) { 972 I->NextDeclInContext = D->NextDeclInContext; 973 if (D == LastDecl) LastDecl = I; 974 break; 975 } 976 } 977 } 978 979 // Mark that D is no longer in the decl chain. 980 D->NextDeclInContext = 0; 981 982 // Remove D from the lookup table if necessary. 983 if (isa<NamedDecl>(D)) { 984 NamedDecl *ND = cast<NamedDecl>(D); 985 986 StoredDeclsMap *Map = getPrimaryContext()->LookupPtr; 987 if (!Map) return; 988 989 StoredDeclsMap::iterator Pos = Map->find(ND->getDeclName()); 990 assert(Pos != Map->end() && "no lookup entry for decl"); 991 Pos->second.remove(ND); 992 } 993} 994 995void DeclContext::addHiddenDecl(Decl *D) { 996 assert(D->getLexicalDeclContext() == this && 997 "Decl inserted into wrong lexical context"); 998 assert(!D->getNextDeclInContext() && D != LastDecl && 999 "Decl already inserted into a DeclContext"); 1000 1001 if (FirstDecl) { 1002 LastDecl->NextDeclInContext = D; 1003 LastDecl = D; 1004 } else { 1005 FirstDecl = LastDecl = D; 1006 } 1007 1008 // Notify a C++ record declaration that we've added a member, so it can 1009 // update it's class-specific state. 1010 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(this)) 1011 Record->addedMember(D); 1012} 1013 1014void DeclContext::addDecl(Decl *D) { 1015 addHiddenDecl(D); 1016 1017 if (NamedDecl *ND = dyn_cast<NamedDecl>(D)) 1018 ND->getDeclContext()->makeDeclVisibleInContext(ND); 1019} 1020 1021/// buildLookup - Build the lookup data structure with all of the 1022/// declarations in DCtx (and any other contexts linked to it or 1023/// transparent contexts nested within it). 1024void DeclContext::buildLookup(DeclContext *DCtx) { 1025 for (; DCtx; DCtx = DCtx->getNextContext()) { 1026 for (decl_iterator D = DCtx->decls_begin(), 1027 DEnd = DCtx->decls_end(); 1028 D != DEnd; ++D) { 1029 // Insert this declaration into the lookup structure, but only 1030 // if it's semantically in its decl context. During non-lazy 1031 // lookup building, this is implicitly enforced by addDecl. 1032 if (NamedDecl *ND = dyn_cast<NamedDecl>(*D)) 1033 if (D->getDeclContext() == DCtx) 1034 makeDeclVisibleInContextImpl(ND); 1035 1036 // Insert any forward-declared Objective-C interfaces into the lookup 1037 // data structure. 1038 if (ObjCClassDecl *Class = dyn_cast<ObjCClassDecl>(*D)) 1039 for (ObjCClassDecl::iterator I = Class->begin(), IEnd = Class->end(); 1040 I != IEnd; ++I) 1041 makeDeclVisibleInContextImpl(I->getInterface()); 1042 1043 // If this declaration is itself a transparent declaration context or 1044 // inline namespace, add its members (recursively). 1045 if (DeclContext *InnerCtx = dyn_cast<DeclContext>(*D)) 1046 if (InnerCtx->isTransparentContext() || InnerCtx->isInlineNamespace()) 1047 buildLookup(InnerCtx->getPrimaryContext()); 1048 } 1049 } 1050} 1051 1052DeclContext::lookup_result 1053DeclContext::lookup(DeclarationName Name) { 1054 DeclContext *PrimaryContext = getPrimaryContext(); 1055 if (PrimaryContext != this) 1056 return PrimaryContext->lookup(Name); 1057 1058 if (hasExternalVisibleStorage()) { 1059 // Check to see if we've already cached the lookup results. 1060 if (LookupPtr) { 1061 StoredDeclsMap::iterator I = LookupPtr->find(Name); 1062 if (I != LookupPtr->end()) 1063 return I->second.getLookupResult(); 1064 } 1065 1066 ExternalASTSource *Source = getParentASTContext().getExternalSource(); 1067 return Source->FindExternalVisibleDeclsByName(this, Name); 1068 } 1069 1070 /// If there is no lookup data structure, build one now by walking 1071 /// all of the linked DeclContexts (in declaration order!) and 1072 /// inserting their values. 1073 if (!LookupPtr) { 1074 buildLookup(this); 1075 1076 if (!LookupPtr) 1077 return lookup_result(lookup_iterator(0), lookup_iterator(0)); 1078 } 1079 1080 StoredDeclsMap::iterator Pos = LookupPtr->find(Name); 1081 if (Pos == LookupPtr->end()) 1082 return lookup_result(lookup_iterator(0), lookup_iterator(0)); 1083 return Pos->second.getLookupResult(); 1084} 1085 1086DeclContext::lookup_const_result 1087DeclContext::lookup(DeclarationName Name) const { 1088 return const_cast<DeclContext*>(this)->lookup(Name); 1089} 1090 1091DeclContext *DeclContext::getRedeclContext() { 1092 DeclContext *Ctx = this; 1093 // Skip through transparent contexts. 1094 while (Ctx->isTransparentContext()) 1095 Ctx = Ctx->getParent(); 1096 return Ctx; 1097} 1098 1099DeclContext *DeclContext::getEnclosingNamespaceContext() { 1100 DeclContext *Ctx = this; 1101 // Skip through non-namespace, non-translation-unit contexts. 1102 while (!Ctx->isFileContext()) 1103 Ctx = Ctx->getParent(); 1104 return Ctx->getPrimaryContext(); 1105} 1106 1107bool DeclContext::InEnclosingNamespaceSetOf(const DeclContext *O) const { 1108 // For non-file contexts, this is equivalent to Equals. 1109 if (!isFileContext()) 1110 return O->Equals(this); 1111 1112 do { 1113 if (O->Equals(this)) 1114 return true; 1115 1116 const NamespaceDecl *NS = dyn_cast<NamespaceDecl>(O); 1117 if (!NS || !NS->isInline()) 1118 break; 1119 O = NS->getParent(); 1120 } while (O); 1121 1122 return false; 1123} 1124 1125void DeclContext::makeDeclVisibleInContext(NamedDecl *D, bool Recoverable) { 1126 // FIXME: This feels like a hack. Should DeclarationName support 1127 // template-ids, or is there a better way to keep specializations 1128 // from being visible? 1129 if (isa<ClassTemplateSpecializationDecl>(D) || D->isTemplateParameter()) 1130 return; 1131 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) 1132 if (FD->isFunctionTemplateSpecialization()) 1133 return; 1134 1135 DeclContext *PrimaryContext = getPrimaryContext(); 1136 if (PrimaryContext != this) { 1137 PrimaryContext->makeDeclVisibleInContext(D, Recoverable); 1138 return; 1139 } 1140 1141 // If we already have a lookup data structure, perform the insertion 1142 // into it. If we haven't deserialized externally stored decls, deserialize 1143 // them so we can add the decl. Otherwise, be lazy and don't build that 1144 // structure until someone asks for it. 1145 if (LookupPtr || !Recoverable || hasExternalVisibleStorage()) 1146 makeDeclVisibleInContextImpl(D); 1147 1148 // If we are a transparent context or inline namespace, insert into our 1149 // parent context, too. This operation is recursive. 1150 if (isTransparentContext() || isInlineNamespace()) 1151 getParent()->makeDeclVisibleInContext(D, Recoverable); 1152 1153 Decl *DCAsDecl = cast<Decl>(this); 1154 // Notify that a decl was made visible unless it's a Tag being defined. 1155 if (!(isa<TagDecl>(DCAsDecl) && cast<TagDecl>(DCAsDecl)->isBeingDefined())) 1156 if (ASTMutationListener *L = DCAsDecl->getASTMutationListener()) 1157 L->AddedVisibleDecl(this, D); 1158} 1159 1160void DeclContext::makeDeclVisibleInContextImpl(NamedDecl *D) { 1161 // Skip unnamed declarations. 1162 if (!D->getDeclName()) 1163 return; 1164 1165 // Skip entities that can't be found by name lookup into a particular 1166 // context. 1167 if ((D->getIdentifierNamespace() == 0 && !isa<UsingDirectiveDecl>(D)) || 1168 D->isTemplateParameter()) 1169 return; 1170 1171 ASTContext *C = 0; 1172 if (!LookupPtr) { 1173 C = &getParentASTContext(); 1174 CreateStoredDeclsMap(*C); 1175 } 1176 1177 // If there is an external AST source, load any declarations it knows about 1178 // with this declaration's name. 1179 // If the lookup table contains an entry about this name it means that we 1180 // have already checked the external source. 1181 if (ExternalASTSource *Source = getParentASTContext().getExternalSource()) 1182 if (hasExternalVisibleStorage() && 1183 LookupPtr->find(D->getDeclName()) == LookupPtr->end()) 1184 Source->FindExternalVisibleDeclsByName(this, D->getDeclName()); 1185 1186 // Insert this declaration into the map. 1187 StoredDeclsList &DeclNameEntries = (*LookupPtr)[D->getDeclName()]; 1188 if (DeclNameEntries.isNull()) { 1189 DeclNameEntries.setOnlyValue(D); 1190 return; 1191 } 1192 1193 // If it is possible that this is a redeclaration, check to see if there is 1194 // already a decl for which declarationReplaces returns true. If there is 1195 // one, just replace it and return. 1196 if (DeclNameEntries.HandleRedeclaration(D)) 1197 return; 1198 1199 // Put this declaration into the appropriate slot. 1200 DeclNameEntries.AddSubsequentDecl(D); 1201} 1202 1203void DeclContext::MaterializeVisibleDeclsFromExternalStorage() { 1204 ExternalASTSource *Source = getParentASTContext().getExternalSource(); 1205 assert(hasExternalVisibleStorage() && Source && "No external storage?"); 1206 1207 if (!LookupPtr) 1208 CreateStoredDeclsMap(getParentASTContext()); 1209 Source->MaterializeVisibleDecls(this); 1210} 1211 1212/// Returns iterator range [First, Last) of UsingDirectiveDecls stored within 1213/// this context. 1214DeclContext::udir_iterator_range 1215DeclContext::getUsingDirectives() const { 1216 lookup_const_result Result = lookup(UsingDirectiveDecl::getName()); 1217 return udir_iterator_range(reinterpret_cast<udir_iterator>(Result.first), 1218 reinterpret_cast<udir_iterator>(Result.second)); 1219} 1220 1221//===----------------------------------------------------------------------===// 1222// Creation and Destruction of StoredDeclsMaps. // 1223//===----------------------------------------------------------------------===// 1224 1225StoredDeclsMap *DeclContext::CreateStoredDeclsMap(ASTContext &C) const { 1226 assert(!LookupPtr && "context already has a decls map"); 1227 assert(getPrimaryContext() == this && 1228 "creating decls map on non-primary context"); 1229 1230 StoredDeclsMap *M; 1231 bool Dependent = isDependentContext(); 1232 if (Dependent) 1233 M = new DependentStoredDeclsMap(); 1234 else 1235 M = new StoredDeclsMap(); 1236 M->Previous = C.LastSDM; 1237 C.LastSDM = llvm::PointerIntPair<StoredDeclsMap*,1>(M, Dependent); 1238 LookupPtr = M; 1239 return M; 1240} 1241 1242void ASTContext::ReleaseDeclContextMaps() { 1243 // It's okay to delete DependentStoredDeclsMaps via a StoredDeclsMap 1244 // pointer because the subclass doesn't add anything that needs to 1245 // be deleted. 1246 StoredDeclsMap::DestroyAll(LastSDM.getPointer(), LastSDM.getInt()); 1247} 1248 1249void StoredDeclsMap::DestroyAll(StoredDeclsMap *Map, bool Dependent) { 1250 while (Map) { 1251 // Advance the iteration before we invalidate memory. 1252 llvm::PointerIntPair<StoredDeclsMap*,1> Next = Map->Previous; 1253 1254 if (Dependent) 1255 delete static_cast<DependentStoredDeclsMap*>(Map); 1256 else 1257 delete Map; 1258 1259 Map = Next.getPointer(); 1260 Dependent = Next.getInt(); 1261 } 1262} 1263 1264DependentDiagnostic *DependentDiagnostic::Create(ASTContext &C, 1265 DeclContext *Parent, 1266 const PartialDiagnostic &PDiag) { 1267 assert(Parent->isDependentContext() 1268 && "cannot iterate dependent diagnostics of non-dependent context"); 1269 Parent = Parent->getPrimaryContext(); 1270 if (!Parent->LookupPtr) 1271 Parent->CreateStoredDeclsMap(C); 1272 1273 DependentStoredDeclsMap *Map 1274 = static_cast<DependentStoredDeclsMap*>(Parent->LookupPtr); 1275 1276 // Allocate the copy of the PartialDiagnostic via the ASTContext's 1277 // BumpPtrAllocator, rather than the ASTContext itself. 1278 PartialDiagnostic::Storage *DiagStorage = 0; 1279 if (PDiag.hasStorage()) 1280 DiagStorage = new (C) PartialDiagnostic::Storage; 1281 1282 DependentDiagnostic *DD = new (C) DependentDiagnostic(PDiag, DiagStorage); 1283 1284 // TODO: Maybe we shouldn't reverse the order during insertion. 1285 DD->NextDiagnostic = Map->FirstDiagnostic; 1286 Map->FirstDiagnostic = DD; 1287 1288 return DD; 1289} 1290