1 //===- DeclBase.h - Base Classes for representing declarations --*- C++ -*-===// 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 defines the Decl and DeclContext interfaces. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_CLANG_AST_DECLBASE_H 15 #define LLVM_CLANG_AST_DECLBASE_H 16 17 #include "clang/AST/AttrIterator.h" 18 #include "clang/AST/DeclarationName.h" 19 #include "clang/Basic/IdentifierTable.h" 20 #include "clang/Basic/LLVM.h" 21 #include "clang/Basic/SourceLocation.h" 22 #include "clang/Basic/Specifiers.h" 23 #include "llvm/ADT/ArrayRef.h" 24 #include "llvm/ADT/PointerIntPair.h" 25 #include "llvm/ADT/PointerUnion.h" 26 #include "llvm/ADT/iterator.h" 27 #include "llvm/ADT/iterator_range.h" 28 #include "llvm/Support/Casting.h" 29 #include "llvm/Support/Compiler.h" 30 #include "llvm/Support/PrettyStackTrace.h" 31 #include "llvm/Support/VersionTuple.h" 32 #include <algorithm> 33 #include <cassert> 34 #include <cstddef> 35 #include <iterator> 36 #include <string> 37 #include <type_traits> 38 #include <utility> 39 40 namespace clang { 41 42 class ASTContext; 43 class ASTMutationListener; 44 class Attr; 45 class DeclContext; 46 class ExternalSourceSymbolAttr; 47 class FunctionDecl; 48 class FunctionType; 49 class IdentifierInfo; 50 enum Linkage : unsigned char; 51 class LinkageSpecDecl; 52 class Module; 53 class NamedDecl; 54 class ObjCCategoryDecl; 55 class ObjCCategoryImplDecl; 56 class ObjCContainerDecl; 57 class ObjCImplDecl; 58 class ObjCImplementationDecl; 59 class ObjCInterfaceDecl; 60 class ObjCMethodDecl; 61 class ObjCProtocolDecl; 62 struct PrintingPolicy; 63 class RecordDecl; 64 class SourceManager; 65 class Stmt; 66 class StoredDeclsMap; 67 class TemplateDecl; 68 class TranslationUnitDecl; 69 class UsingDirectiveDecl; 70 71 /// Captures the result of checking the availability of a 72 /// declaration. 73 enum AvailabilityResult { 74 AR_Available = 0, 75 AR_NotYetIntroduced, 76 AR_Deprecated, 77 AR_Unavailable 78 }; 79 80 /// Decl - This represents one declaration (or definition), e.g. a variable, 81 /// typedef, function, struct, etc. 82 /// 83 /// Note: There are objects tacked on before the *beginning* of Decl 84 /// (and its subclasses) in its Decl::operator new(). Proper alignment 85 /// of all subclasses (not requiring more than the alignment of Decl) is 86 /// asserted in DeclBase.cpp. 87 class alignas(8) Decl { 88 public: 89 /// Lists the kind of concrete classes of Decl. 90 enum Kind { 91 #define DECL(DERIVED, BASE) DERIVED, 92 #define ABSTRACT_DECL(DECL) 93 #define DECL_RANGE(BASE, START, END) \ 94 first##BASE = START, last##BASE = END, 95 #define LAST_DECL_RANGE(BASE, START, END) \ 96 first##BASE = START, last##BASE = END 97 #include "clang/AST/DeclNodes.inc" 98 }; 99 100 /// A placeholder type used to construct an empty shell of a 101 /// decl-derived type that will be filled in later (e.g., by some 102 /// deserialization method). 103 struct EmptyShell {}; 104 105 /// IdentifierNamespace - The different namespaces in which 106 /// declarations may appear. According to C99 6.2.3, there are 107 /// four namespaces, labels, tags, members and ordinary 108 /// identifiers. C++ describes lookup completely differently: 109 /// certain lookups merely "ignore" certain kinds of declarations, 110 /// usually based on whether the declaration is of a type, etc. 111 /// 112 /// These are meant as bitmasks, so that searches in 113 /// C++ can look into the "tag" namespace during ordinary lookup. 114 /// 115 /// Decl currently provides 15 bits of IDNS bits. 116 enum IdentifierNamespace { 117 /// Labels, declared with 'x:' and referenced with 'goto x'. 118 IDNS_Label = 0x0001, 119 120 /// Tags, declared with 'struct foo;' and referenced with 121 /// 'struct foo'. All tags are also types. This is what 122 /// elaborated-type-specifiers look for in C. 123 /// This also contains names that conflict with tags in the 124 /// same scope but that are otherwise ordinary names (non-type 125 /// template parameters and indirect field declarations). 126 IDNS_Tag = 0x0002, 127 128 /// Types, declared with 'struct foo', typedefs, etc. 129 /// This is what elaborated-type-specifiers look for in C++, 130 /// but note that it's ill-formed to find a non-tag. 131 IDNS_Type = 0x0004, 132 133 /// Members, declared with object declarations within tag 134 /// definitions. In C, these can only be found by "qualified" 135 /// lookup in member expressions. In C++, they're found by 136 /// normal lookup. 137 IDNS_Member = 0x0008, 138 139 /// Namespaces, declared with 'namespace foo {}'. 140 /// Lookup for nested-name-specifiers find these. 141 IDNS_Namespace = 0x0010, 142 143 /// Ordinary names. In C, everything that's not a label, tag, 144 /// member, or function-local extern ends up here. 145 IDNS_Ordinary = 0x0020, 146 147 /// Objective C \@protocol. 148 IDNS_ObjCProtocol = 0x0040, 149 150 /// This declaration is a friend function. A friend function 151 /// declaration is always in this namespace but may also be in 152 /// IDNS_Ordinary if it was previously declared. 153 IDNS_OrdinaryFriend = 0x0080, 154 155 /// This declaration is a friend class. A friend class 156 /// declaration is always in this namespace but may also be in 157 /// IDNS_Tag|IDNS_Type if it was previously declared. 158 IDNS_TagFriend = 0x0100, 159 160 /// This declaration is a using declaration. A using declaration 161 /// *introduces* a number of other declarations into the current 162 /// scope, and those declarations use the IDNS of their targets, 163 /// but the actual using declarations go in this namespace. 164 IDNS_Using = 0x0200, 165 166 /// This declaration is a C++ operator declared in a non-class 167 /// context. All such operators are also in IDNS_Ordinary. 168 /// C++ lexical operator lookup looks for these. 169 IDNS_NonMemberOperator = 0x0400, 170 171 /// This declaration is a function-local extern declaration of a 172 /// variable or function. This may also be IDNS_Ordinary if it 173 /// has been declared outside any function. These act mostly like 174 /// invisible friend declarations, but are also visible to unqualified 175 /// lookup within the scope of the declaring function. 176 IDNS_LocalExtern = 0x0800, 177 178 /// This declaration is an OpenMP user defined reduction construction. 179 IDNS_OMPReduction = 0x1000 180 }; 181 182 /// ObjCDeclQualifier - 'Qualifiers' written next to the return and 183 /// parameter types in method declarations. Other than remembering 184 /// them and mangling them into the method's signature string, these 185 /// are ignored by the compiler; they are consumed by certain 186 /// remote-messaging frameworks. 187 /// 188 /// in, inout, and out are mutually exclusive and apply only to 189 /// method parameters. bycopy and byref are mutually exclusive and 190 /// apply only to method parameters (?). oneway applies only to 191 /// results. All of these expect their corresponding parameter to 192 /// have a particular type. None of this is currently enforced by 193 /// clang. 194 /// 195 /// This should be kept in sync with ObjCDeclSpec::ObjCDeclQualifier. 196 enum ObjCDeclQualifier { 197 OBJC_TQ_None = 0x0, 198 OBJC_TQ_In = 0x1, 199 OBJC_TQ_Inout = 0x2, 200 OBJC_TQ_Out = 0x4, 201 OBJC_TQ_Bycopy = 0x8, 202 OBJC_TQ_Byref = 0x10, 203 OBJC_TQ_Oneway = 0x20, 204 205 /// The nullability qualifier is set when the nullability of the 206 /// result or parameter was expressed via a context-sensitive 207 /// keyword. 208 OBJC_TQ_CSNullability = 0x40 209 }; 210 211 /// The kind of ownership a declaration has, for visibility purposes. 212 /// This enumeration is designed such that higher values represent higher 213 /// levels of name hiding. 214 enum class ModuleOwnershipKind : unsigned { 215 /// This declaration is not owned by a module. 216 Unowned, 217 218 /// This declaration has an owning module, but is globally visible 219 /// (typically because its owning module is visible and we know that 220 /// modules cannot later become hidden in this compilation). 221 /// After serialization and deserialization, this will be converted 222 /// to VisibleWhenImported. 223 Visible, 224 225 /// This declaration has an owning module, and is visible when that 226 /// module is imported. 227 VisibleWhenImported, 228 229 /// This declaration has an owning module, but is only visible to 230 /// lookups that occur within that module. 231 ModulePrivate 232 }; 233 234 protected: 235 /// The next declaration within the same lexical 236 /// DeclContext. These pointers form the linked list that is 237 /// traversed via DeclContext's decls_begin()/decls_end(). 238 /// 239 /// The extra two bits are used for the ModuleOwnershipKind. 240 llvm::PointerIntPair<Decl *, 2, ModuleOwnershipKind> NextInContextAndBits; 241 242 private: 243 friend class DeclContext; 244 245 struct MultipleDC { 246 DeclContext *SemanticDC; 247 DeclContext *LexicalDC; 248 }; 249 250 /// DeclCtx - Holds either a DeclContext* or a MultipleDC*. 251 /// For declarations that don't contain C++ scope specifiers, it contains 252 /// the DeclContext where the Decl was declared. 253 /// For declarations with C++ scope specifiers, it contains a MultipleDC* 254 /// with the context where it semantically belongs (SemanticDC) and the 255 /// context where it was lexically declared (LexicalDC). 256 /// e.g.: 257 /// 258 /// namespace A { 259 /// void f(); // SemanticDC == LexicalDC == 'namespace A' 260 /// } 261 /// void A::f(); // SemanticDC == namespace 'A' 262 /// // LexicalDC == global namespace 263 llvm::PointerUnion<DeclContext*, MultipleDC*> DeclCtx; 264 265 bool isInSemaDC() const { return DeclCtx.is<DeclContext*>(); } 266 bool isOutOfSemaDC() const { return DeclCtx.is<MultipleDC*>(); } 267 268 MultipleDC *getMultipleDC() const { 269 return DeclCtx.get<MultipleDC*>(); 270 } 271 272 DeclContext *getSemanticDC() const { 273 return DeclCtx.get<DeclContext*>(); 274 } 275 276 /// Loc - The location of this decl. 277 SourceLocation Loc; 278 279 /// DeclKind - This indicates which class this is. 280 unsigned DeclKind : 7; 281 282 /// InvalidDecl - This indicates a semantic error occurred. 283 unsigned InvalidDecl : 1; 284 285 /// HasAttrs - This indicates whether the decl has attributes or not. 286 unsigned HasAttrs : 1; 287 288 /// Implicit - Whether this declaration was implicitly generated by 289 /// the implementation rather than explicitly written by the user. 290 unsigned Implicit : 1; 291 292 /// Whether this declaration was "used", meaning that a definition is 293 /// required. 294 unsigned Used : 1; 295 296 /// Whether this declaration was "referenced". 297 /// The difference with 'Used' is whether the reference appears in a 298 /// evaluated context or not, e.g. functions used in uninstantiated templates 299 /// are regarded as "referenced" but not "used". 300 unsigned Referenced : 1; 301 302 /// Whether this declaration is a top-level declaration (function, 303 /// global variable, etc.) that is lexically inside an objc container 304 /// definition. 305 unsigned TopLevelDeclInObjCContainer : 1; 306 307 /// Whether statistic collection is enabled. 308 static bool StatisticsEnabled; 309 310 protected: 311 friend class ASTDeclReader; 312 friend class ASTDeclWriter; 313 friend class ASTNodeImporter; 314 friend class ASTReader; 315 friend class CXXClassMemberWrapper; 316 friend class LinkageComputer; 317 template<typename decl_type> friend class Redeclarable; 318 319 /// Access - Used by C++ decls for the access specifier. 320 // NOTE: VC++ treats enums as signed, avoid using the AccessSpecifier enum 321 unsigned Access : 2; 322 323 /// Whether this declaration was loaded from an AST file. 324 unsigned FromASTFile : 1; 325 326 /// IdentifierNamespace - This specifies what IDNS_* namespace this lives in. 327 unsigned IdentifierNamespace : 13; 328 329 /// If 0, we have not computed the linkage of this declaration. 330 /// Otherwise, it is the linkage + 1. 331 mutable unsigned CacheValidAndLinkage : 3; 332 333 /// Allocate memory for a deserialized declaration. 334 /// 335 /// This routine must be used to allocate memory for any declaration that is 336 /// deserialized from a module file. 337 /// 338 /// \param Size The size of the allocated object. 339 /// \param Ctx The context in which we will allocate memory. 340 /// \param ID The global ID of the deserialized declaration. 341 /// \param Extra The amount of extra space to allocate after the object. 342 void *operator new(std::size_t Size, const ASTContext &Ctx, unsigned ID, 343 std::size_t Extra = 0); 344 345 /// Allocate memory for a non-deserialized declaration. 346 void *operator new(std::size_t Size, const ASTContext &Ctx, 347 DeclContext *Parent, std::size_t Extra = 0); 348 349 private: 350 bool AccessDeclContextSanity() const; 351 352 /// Get the module ownership kind to use for a local lexical child of \p DC, 353 /// which may be either a local or (rarely) an imported declaration. 354 static ModuleOwnershipKind getModuleOwnershipKindForChildOf(DeclContext *DC) { 355 if (DC) { 356 auto *D = cast<Decl>(DC); 357 auto MOK = D->getModuleOwnershipKind(); 358 if (MOK != ModuleOwnershipKind::Unowned && 359 (!D->isFromASTFile() || D->hasLocalOwningModuleStorage())) 360 return MOK; 361 // If D is not local and we have no local module storage, then we don't 362 // need to track module ownership at all. 363 } 364 return ModuleOwnershipKind::Unowned; 365 } 366 367 protected: 368 Decl(Kind DK, DeclContext *DC, SourceLocation L) 369 : NextInContextAndBits(nullptr, getModuleOwnershipKindForChildOf(DC)), 370 DeclCtx(DC), Loc(L), DeclKind(DK), InvalidDecl(false), HasAttrs(false), 371 Implicit(false), Used(false), Referenced(false), 372 TopLevelDeclInObjCContainer(false), Access(AS_none), FromASTFile(0), 373 IdentifierNamespace(getIdentifierNamespaceForKind(DK)), 374 CacheValidAndLinkage(0) { 375 if (StatisticsEnabled) add(DK); 376 } 377 378 Decl(Kind DK, EmptyShell Empty) 379 : DeclKind(DK), InvalidDecl(false), HasAttrs(false), Implicit(false), 380 Used(false), Referenced(false), TopLevelDeclInObjCContainer(false), 381 Access(AS_none), FromASTFile(0), 382 IdentifierNamespace(getIdentifierNamespaceForKind(DK)), 383 CacheValidAndLinkage(0) { 384 if (StatisticsEnabled) add(DK); 385 } 386 387 virtual ~Decl(); 388 389 /// Update a potentially out-of-date declaration. 390 void updateOutOfDate(IdentifierInfo &II) const; 391 392 Linkage getCachedLinkage() const { 393 return Linkage(CacheValidAndLinkage - 1); 394 } 395 396 void setCachedLinkage(Linkage L) const { 397 CacheValidAndLinkage = L + 1; 398 } 399 400 bool hasCachedLinkage() const { 401 return CacheValidAndLinkage; 402 } 403 404 public: 405 /// Source range that this declaration covers. 406 virtual SourceRange getSourceRange() const LLVM_READONLY { 407 return SourceRange(getLocation(), getLocation()); 408 } 409 410 SourceLocation getBeginLoc() const LLVM_READONLY { 411 return getSourceRange().getBegin(); 412 } 413 414 SourceLocation getEndLoc() const LLVM_READONLY { 415 return getSourceRange().getEnd(); 416 } 417 418 SourceLocation getLocation() const { return Loc; } 419 void setLocation(SourceLocation L) { Loc = L; } 420 421 Kind getKind() const { return static_cast<Kind>(DeclKind); } 422 const char *getDeclKindName() const; 423 424 Decl *getNextDeclInContext() { return NextInContextAndBits.getPointer(); } 425 const Decl *getNextDeclInContext() const {return NextInContextAndBits.getPointer();} 426 427 DeclContext *getDeclContext() { 428 if (isInSemaDC()) 429 return getSemanticDC(); 430 return getMultipleDC()->SemanticDC; 431 } 432 const DeclContext *getDeclContext() const { 433 return const_cast<Decl*>(this)->getDeclContext(); 434 } 435 436 /// Find the innermost non-closure ancestor of this declaration, 437 /// walking up through blocks, lambdas, etc. If that ancestor is 438 /// not a code context (!isFunctionOrMethod()), returns null. 439 /// 440 /// A declaration may be its own non-closure context. 441 Decl *getNonClosureContext(); 442 const Decl *getNonClosureContext() const { 443 return const_cast<Decl*>(this)->getNonClosureContext(); 444 } 445 446 TranslationUnitDecl *getTranslationUnitDecl(); 447 const TranslationUnitDecl *getTranslationUnitDecl() const { 448 return const_cast<Decl*>(this)->getTranslationUnitDecl(); 449 } 450 451 bool isInAnonymousNamespace() const; 452 453 bool isInStdNamespace() const; 454 455 ASTContext &getASTContext() const LLVM_READONLY; 456 457 void setAccess(AccessSpecifier AS) { 458 Access = AS; 459 assert(AccessDeclContextSanity()); 460 } 461 462 AccessSpecifier getAccess() const { 463 assert(AccessDeclContextSanity()); 464 return AccessSpecifier(Access); 465 } 466 467 /// Retrieve the access specifier for this declaration, even though 468 /// it may not yet have been properly set. 469 AccessSpecifier getAccessUnsafe() const { 470 return AccessSpecifier(Access); 471 } 472 473 bool hasAttrs() const { return HasAttrs; } 474 475 void setAttrs(const AttrVec& Attrs) { 476 return setAttrsImpl(Attrs, getASTContext()); 477 } 478 479 AttrVec &getAttrs() { 480 return const_cast<AttrVec&>(const_cast<const Decl*>(this)->getAttrs()); 481 } 482 483 const AttrVec &getAttrs() const; 484 void dropAttrs(); 485 void addAttr(Attr *A); 486 487 using attr_iterator = AttrVec::const_iterator; 488 using attr_range = llvm::iterator_range<attr_iterator>; 489 490 attr_range attrs() const { 491 return attr_range(attr_begin(), attr_end()); 492 } 493 494 attr_iterator attr_begin() const { 495 return hasAttrs() ? getAttrs().begin() : nullptr; 496 } 497 attr_iterator attr_end() const { 498 return hasAttrs() ? getAttrs().end() : nullptr; 499 } 500 501 template <typename T> 502 void dropAttr() { 503 if (!HasAttrs) return; 504 505 AttrVec &Vec = getAttrs(); 506 Vec.erase(std::remove_if(Vec.begin(), Vec.end(), isa<T, Attr*>), Vec.end()); 507 508 if (Vec.empty()) 509 HasAttrs = false; 510 } 511 512 template <typename T> 513 llvm::iterator_range<specific_attr_iterator<T>> specific_attrs() const { 514 return llvm::make_range(specific_attr_begin<T>(), specific_attr_end<T>()); 515 } 516 517 template <typename T> 518 specific_attr_iterator<T> specific_attr_begin() const { 519 return specific_attr_iterator<T>(attr_begin()); 520 } 521 522 template <typename T> 523 specific_attr_iterator<T> specific_attr_end() const { 524 return specific_attr_iterator<T>(attr_end()); 525 } 526 527 template<typename T> T *getAttr() const { 528 return hasAttrs() ? getSpecificAttr<T>(getAttrs()) : nullptr; 529 } 530 531 template<typename T> bool hasAttr() const { 532 return hasAttrs() && hasSpecificAttr<T>(getAttrs()); 533 } 534 535 /// getMaxAlignment - return the maximum alignment specified by attributes 536 /// on this decl, 0 if there are none. 537 unsigned getMaxAlignment() const; 538 539 /// setInvalidDecl - Indicates the Decl had a semantic error. This 540 /// allows for graceful error recovery. 541 void setInvalidDecl(bool Invalid = true); 542 bool isInvalidDecl() const { return (bool) InvalidDecl; } 543 544 /// isImplicit - Indicates whether the declaration was implicitly 545 /// generated by the implementation. If false, this declaration 546 /// was written explicitly in the source code. 547 bool isImplicit() const { return Implicit; } 548 void setImplicit(bool I = true) { Implicit = I; } 549 550 /// Whether *any* (re-)declaration of the entity was used, meaning that 551 /// a definition is required. 552 /// 553 /// \param CheckUsedAttr When true, also consider the "used" attribute 554 /// (in addition to the "used" bit set by \c setUsed()) when determining 555 /// whether the function is used. 556 bool isUsed(bool CheckUsedAttr = true) const; 557 558 /// Set whether the declaration is used, in the sense of odr-use. 559 /// 560 /// This should only be used immediately after creating a declaration. 561 /// It intentionally doesn't notify any listeners. 562 void setIsUsed() { getCanonicalDecl()->Used = true; } 563 564 /// Mark the declaration used, in the sense of odr-use. 565 /// 566 /// This notifies any mutation listeners in addition to setting a bit 567 /// indicating the declaration is used. 568 void markUsed(ASTContext &C); 569 570 /// Whether any declaration of this entity was referenced. 571 bool isReferenced() const; 572 573 /// Whether this declaration was referenced. This should not be relied 574 /// upon for anything other than debugging. 575 bool isThisDeclarationReferenced() const { return Referenced; } 576 577 void setReferenced(bool R = true) { Referenced = R; } 578 579 /// Whether this declaration is a top-level declaration (function, 580 /// global variable, etc.) that is lexically inside an objc container 581 /// definition. 582 bool isTopLevelDeclInObjCContainer() const { 583 return TopLevelDeclInObjCContainer; 584 } 585 586 void setTopLevelDeclInObjCContainer(bool V = true) { 587 TopLevelDeclInObjCContainer = V; 588 } 589 590 /// Looks on this and related declarations for an applicable 591 /// external source symbol attribute. 592 ExternalSourceSymbolAttr *getExternalSourceSymbolAttr() const; 593 594 /// Whether this declaration was marked as being private to the 595 /// module in which it was defined. 596 bool isModulePrivate() const { 597 return getModuleOwnershipKind() == ModuleOwnershipKind::ModulePrivate; 598 } 599 600 /// Whether this declaration is exported (by virtue of being lexically 601 /// within an ExportDecl or by being a NamespaceDecl). 602 bool isExported() const; 603 604 /// Return true if this declaration has an attribute which acts as 605 /// definition of the entity, such as 'alias' or 'ifunc'. 606 bool hasDefiningAttr() const; 607 608 /// Return this declaration's defining attribute if it has one. 609 const Attr *getDefiningAttr() const; 610 611 protected: 612 /// Specify that this declaration was marked as being private 613 /// to the module in which it was defined. 614 void setModulePrivate() { 615 // The module-private specifier has no effect on unowned declarations. 616 // FIXME: We should track this in some way for source fidelity. 617 if (getModuleOwnershipKind() == ModuleOwnershipKind::Unowned) 618 return; 619 setModuleOwnershipKind(ModuleOwnershipKind::ModulePrivate); 620 } 621 622 /// Set the owning module ID. 623 void setOwningModuleID(unsigned ID) { 624 assert(isFromASTFile() && "Only works on a deserialized declaration"); 625 *((unsigned*)this - 2) = ID; 626 } 627 628 public: 629 /// Determine the availability of the given declaration. 630 /// 631 /// This routine will determine the most restrictive availability of 632 /// the given declaration (e.g., preferring 'unavailable' to 633 /// 'deprecated'). 634 /// 635 /// \param Message If non-NULL and the result is not \c 636 /// AR_Available, will be set to a (possibly empty) message 637 /// describing why the declaration has not been introduced, is 638 /// deprecated, or is unavailable. 639 /// 640 /// \param EnclosingVersion The version to compare with. If empty, assume the 641 /// deployment target version. 642 /// 643 /// \param RealizedPlatform If non-NULL and the availability result is found 644 /// in an available attribute it will set to the platform which is written in 645 /// the available attribute. 646 AvailabilityResult 647 getAvailability(std::string *Message = nullptr, 648 VersionTuple EnclosingVersion = VersionTuple(), 649 StringRef *RealizedPlatform = nullptr) const; 650 651 /// Retrieve the version of the target platform in which this 652 /// declaration was introduced. 653 /// 654 /// \returns An empty version tuple if this declaration has no 'introduced' 655 /// availability attributes, or the version tuple that's specified in the 656 /// attribute otherwise. 657 VersionTuple getVersionIntroduced() const; 658 659 /// Determine whether this declaration is marked 'deprecated'. 660 /// 661 /// \param Message If non-NULL and the declaration is deprecated, 662 /// this will be set to the message describing why the declaration 663 /// was deprecated (which may be empty). 664 bool isDeprecated(std::string *Message = nullptr) const { 665 return getAvailability(Message) == AR_Deprecated; 666 } 667 668 /// Determine whether this declaration is marked 'unavailable'. 669 /// 670 /// \param Message If non-NULL and the declaration is unavailable, 671 /// this will be set to the message describing why the declaration 672 /// was made unavailable (which may be empty). 673 bool isUnavailable(std::string *Message = nullptr) const { 674 return getAvailability(Message) == AR_Unavailable; 675 } 676 677 /// Determine whether this is a weak-imported symbol. 678 /// 679 /// Weak-imported symbols are typically marked with the 680 /// 'weak_import' attribute, but may also be marked with an 681 /// 'availability' attribute where we're targing a platform prior to 682 /// the introduction of this feature. 683 bool isWeakImported() const; 684 685 /// Determines whether this symbol can be weak-imported, 686 /// e.g., whether it would be well-formed to add the weak_import 687 /// attribute. 688 /// 689 /// \param IsDefinition Set to \c true to indicate that this 690 /// declaration cannot be weak-imported because it has a definition. 691 bool canBeWeakImported(bool &IsDefinition) const; 692 693 /// Determine whether this declaration came from an AST file (such as 694 /// a precompiled header or module) rather than having been parsed. 695 bool isFromASTFile() const { return FromASTFile; } 696 697 /// Retrieve the global declaration ID associated with this 698 /// declaration, which specifies where this Decl was loaded from. 699 unsigned getGlobalID() const { 700 if (isFromASTFile()) 701 return *((const unsigned*)this - 1); 702 return 0; 703 } 704 705 /// Retrieve the global ID of the module that owns this particular 706 /// declaration. 707 unsigned getOwningModuleID() const { 708 if (isFromASTFile()) 709 return *((const unsigned*)this - 2); 710 return 0; 711 } 712 713 private: 714 Module *getOwningModuleSlow() const; 715 716 protected: 717 bool hasLocalOwningModuleStorage() const; 718 719 public: 720 /// Get the imported owning module, if this decl is from an imported 721 /// (non-local) module. 722 Module *getImportedOwningModule() const { 723 if (!isFromASTFile() || !hasOwningModule()) 724 return nullptr; 725 726 return getOwningModuleSlow(); 727 } 728 729 /// Get the local owning module, if known. Returns nullptr if owner is 730 /// not yet known or declaration is not from a module. 731 Module *getLocalOwningModule() const { 732 if (isFromASTFile() || !hasOwningModule()) 733 return nullptr; 734 735 assert(hasLocalOwningModuleStorage() && 736 "owned local decl but no local module storage"); 737 return reinterpret_cast<Module *const *>(this)[-1]; 738 } 739 void setLocalOwningModule(Module *M) { 740 assert(!isFromASTFile() && hasOwningModule() && 741 hasLocalOwningModuleStorage() && 742 "should not have a cached owning module"); 743 reinterpret_cast<Module **>(this)[-1] = M; 744 } 745 746 /// Is this declaration owned by some module? 747 bool hasOwningModule() const { 748 return getModuleOwnershipKind() != ModuleOwnershipKind::Unowned; 749 } 750 751 /// Get the module that owns this declaration (for visibility purposes). 752 Module *getOwningModule() const { 753 return isFromASTFile() ? getImportedOwningModule() : getLocalOwningModule(); 754 } 755 756 /// Get the module that owns this declaration for linkage purposes. 757 /// There only ever is such a module under the C++ Modules TS. 758 /// 759 /// \param IgnoreLinkage Ignore the linkage of the entity; assume that 760 /// all declarations in a global module fragment are unowned. 761 Module *getOwningModuleForLinkage(bool IgnoreLinkage = false) const; 762 763 /// Determine whether this declaration might be hidden from name 764 /// lookup. Note that the declaration might be visible even if this returns 765 /// \c false, if the owning module is visible within the query context. 766 // FIXME: Rename this to make it clearer what it does. 767 bool isHidden() const { 768 return (int)getModuleOwnershipKind() > (int)ModuleOwnershipKind::Visible; 769 } 770 771 /// Set that this declaration is globally visible, even if it came from a 772 /// module that is not visible. 773 void setVisibleDespiteOwningModule() { 774 if (isHidden()) 775 setModuleOwnershipKind(ModuleOwnershipKind::Visible); 776 } 777 778 /// Get the kind of module ownership for this declaration. 779 ModuleOwnershipKind getModuleOwnershipKind() const { 780 return NextInContextAndBits.getInt(); 781 } 782 783 /// Set whether this declaration is hidden from name lookup. 784 void setModuleOwnershipKind(ModuleOwnershipKind MOK) { 785 assert(!(getModuleOwnershipKind() == ModuleOwnershipKind::Unowned && 786 MOK != ModuleOwnershipKind::Unowned && !isFromASTFile() && 787 !hasLocalOwningModuleStorage()) && 788 "no storage available for owning module for this declaration"); 789 NextInContextAndBits.setInt(MOK); 790 } 791 792 unsigned getIdentifierNamespace() const { 793 return IdentifierNamespace; 794 } 795 796 bool isInIdentifierNamespace(unsigned NS) const { 797 return getIdentifierNamespace() & NS; 798 } 799 800 static unsigned getIdentifierNamespaceForKind(Kind DK); 801 802 bool hasTagIdentifierNamespace() const { 803 return isTagIdentifierNamespace(getIdentifierNamespace()); 804 } 805 806 static bool isTagIdentifierNamespace(unsigned NS) { 807 // TagDecls have Tag and Type set and may also have TagFriend. 808 return (NS & ~IDNS_TagFriend) == (IDNS_Tag | IDNS_Type); 809 } 810 811 /// getLexicalDeclContext - The declaration context where this Decl was 812 /// lexically declared (LexicalDC). May be different from 813 /// getDeclContext() (SemanticDC). 814 /// e.g.: 815 /// 816 /// namespace A { 817 /// void f(); // SemanticDC == LexicalDC == 'namespace A' 818 /// } 819 /// void A::f(); // SemanticDC == namespace 'A' 820 /// // LexicalDC == global namespace 821 DeclContext *getLexicalDeclContext() { 822 if (isInSemaDC()) 823 return getSemanticDC(); 824 return getMultipleDC()->LexicalDC; 825 } 826 const DeclContext *getLexicalDeclContext() const { 827 return const_cast<Decl*>(this)->getLexicalDeclContext(); 828 } 829 830 /// Determine whether this declaration is declared out of line (outside its 831 /// semantic context). 832 virtual bool isOutOfLine() const; 833 834 /// setDeclContext - Set both the semantic and lexical DeclContext 835 /// to DC. 836 void setDeclContext(DeclContext *DC); 837 838 void setLexicalDeclContext(DeclContext *DC); 839 840 /// Determine whether this declaration is a templated entity (whether it is 841 // within the scope of a template parameter). 842 bool isTemplated() const; 843 844 /// isDefinedOutsideFunctionOrMethod - This predicate returns true if this 845 /// scoped decl is defined outside the current function or method. This is 846 /// roughly global variables and functions, but also handles enums (which 847 /// could be defined inside or outside a function etc). 848 bool isDefinedOutsideFunctionOrMethod() const { 849 return getParentFunctionOrMethod() == nullptr; 850 } 851 852 /// Returns true if this declaration lexically is inside a function. 853 /// It recognizes non-defining declarations as well as members of local 854 /// classes: 855 /// \code 856 /// void foo() { void bar(); } 857 /// void foo2() { class ABC { void bar(); }; } 858 /// \endcode 859 bool isLexicallyWithinFunctionOrMethod() const; 860 861 /// If this decl is defined inside a function/method/block it returns 862 /// the corresponding DeclContext, otherwise it returns null. 863 const DeclContext *getParentFunctionOrMethod() const; 864 DeclContext *getParentFunctionOrMethod() { 865 return const_cast<DeclContext*>( 866 const_cast<const Decl*>(this)->getParentFunctionOrMethod()); 867 } 868 869 /// Retrieves the "canonical" declaration of the given declaration. 870 virtual Decl *getCanonicalDecl() { return this; } 871 const Decl *getCanonicalDecl() const { 872 return const_cast<Decl*>(this)->getCanonicalDecl(); 873 } 874 875 /// Whether this particular Decl is a canonical one. 876 bool isCanonicalDecl() const { return getCanonicalDecl() == this; } 877 878 protected: 879 /// Returns the next redeclaration or itself if this is the only decl. 880 /// 881 /// Decl subclasses that can be redeclared should override this method so that 882 /// Decl::redecl_iterator can iterate over them. 883 virtual Decl *getNextRedeclarationImpl() { return this; } 884 885 /// Implementation of getPreviousDecl(), to be overridden by any 886 /// subclass that has a redeclaration chain. 887 virtual Decl *getPreviousDeclImpl() { return nullptr; } 888 889 /// Implementation of getMostRecentDecl(), to be overridden by any 890 /// subclass that has a redeclaration chain. 891 virtual Decl *getMostRecentDeclImpl() { return this; } 892 893 public: 894 /// Iterates through all the redeclarations of the same decl. 895 class redecl_iterator { 896 /// Current - The current declaration. 897 Decl *Current = nullptr; 898 Decl *Starter; 899 900 public: 901 using value_type = Decl *; 902 using reference = const value_type &; 903 using pointer = const value_type *; 904 using iterator_category = std::forward_iterator_tag; 905 using difference_type = std::ptrdiff_t; 906 907 redecl_iterator() = default; 908 explicit redecl_iterator(Decl *C) : Current(C), Starter(C) {} 909 910 reference operator*() const { return Current; } 911 value_type operator->() const { return Current; } 912 913 redecl_iterator& operator++() { 914 assert(Current && "Advancing while iterator has reached end"); 915 // Get either previous decl or latest decl. 916 Decl *Next = Current->getNextRedeclarationImpl(); 917 assert(Next && "Should return next redeclaration or itself, never null!"); 918 Current = (Next != Starter) ? Next : nullptr; 919 return *this; 920 } 921 922 redecl_iterator operator++(int) { 923 redecl_iterator tmp(*this); 924 ++(*this); 925 return tmp; 926 } 927 928 friend bool operator==(redecl_iterator x, redecl_iterator y) { 929 return x.Current == y.Current; 930 } 931 932 friend bool operator!=(redecl_iterator x, redecl_iterator y) { 933 return x.Current != y.Current; 934 } 935 }; 936 937 using redecl_range = llvm::iterator_range<redecl_iterator>; 938 939 /// Returns an iterator range for all the redeclarations of the same 940 /// decl. It will iterate at least once (when this decl is the only one). 941 redecl_range redecls() const { 942 return redecl_range(redecls_begin(), redecls_end()); 943 } 944 945 redecl_iterator redecls_begin() const { 946 return redecl_iterator(const_cast<Decl *>(this)); 947 } 948 949 redecl_iterator redecls_end() const { return redecl_iterator(); } 950 951 /// Retrieve the previous declaration that declares the same entity 952 /// as this declaration, or NULL if there is no previous declaration. 953 Decl *getPreviousDecl() { return getPreviousDeclImpl(); } 954 955 /// Retrieve the most recent declaration that declares the same entity 956 /// as this declaration, or NULL if there is no previous declaration. 957 const Decl *getPreviousDecl() const { 958 return const_cast<Decl *>(this)->getPreviousDeclImpl(); 959 } 960 961 /// True if this is the first declaration in its redeclaration chain. 962 bool isFirstDecl() const { 963 return getPreviousDecl() == nullptr; 964 } 965 966 /// Retrieve the most recent declaration that declares the same entity 967 /// as this declaration (which may be this declaration). 968 Decl *getMostRecentDecl() { return getMostRecentDeclImpl(); } 969 970 /// Retrieve the most recent declaration that declares the same entity 971 /// as this declaration (which may be this declaration). 972 const Decl *getMostRecentDecl() const { 973 return const_cast<Decl *>(this)->getMostRecentDeclImpl(); 974 } 975 976 /// getBody - If this Decl represents a declaration for a body of code, 977 /// such as a function or method definition, this method returns the 978 /// top-level Stmt* of that body. Otherwise this method returns null. 979 virtual Stmt* getBody() const { return nullptr; } 980 981 /// Returns true if this \c Decl represents a declaration for a body of 982 /// code, such as a function or method definition. 983 /// Note that \c hasBody can also return true if any redeclaration of this 984 /// \c Decl represents a declaration for a body of code. 985 virtual bool hasBody() const { return getBody() != nullptr; } 986 987 /// getBodyRBrace - Gets the right brace of the body, if a body exists. 988 /// This works whether the body is a CompoundStmt or a CXXTryStmt. 989 SourceLocation getBodyRBrace() const; 990 991 // global temp stats (until we have a per-module visitor) 992 static void add(Kind k); 993 static void EnableStatistics(); 994 static void PrintStats(); 995 996 /// isTemplateParameter - Determines whether this declaration is a 997 /// template parameter. 998 bool isTemplateParameter() const; 999 1000 /// isTemplateParameter - Determines whether this declaration is a 1001 /// template parameter pack. 1002 bool isTemplateParameterPack() const; 1003 1004 /// Whether this declaration is a parameter pack. 1005 bool isParameterPack() const; 1006 1007 /// returns true if this declaration is a template 1008 bool isTemplateDecl() const; 1009 1010 /// Whether this declaration is a function or function template. 1011 bool isFunctionOrFunctionTemplate() const { 1012 return (DeclKind >= Decl::firstFunction && 1013 DeclKind <= Decl::lastFunction) || 1014 DeclKind == FunctionTemplate; 1015 } 1016 1017 /// If this is a declaration that describes some template, this 1018 /// method returns that template declaration. 1019 TemplateDecl *getDescribedTemplate() const; 1020 1021 /// Returns the function itself, or the templated function if this is a 1022 /// function template. 1023 FunctionDecl *getAsFunction() LLVM_READONLY; 1024 1025 const FunctionDecl *getAsFunction() const { 1026 return const_cast<Decl *>(this)->getAsFunction(); 1027 } 1028 1029 /// Changes the namespace of this declaration to reflect that it's 1030 /// a function-local extern declaration. 1031 /// 1032 /// These declarations appear in the lexical context of the extern 1033 /// declaration, but in the semantic context of the enclosing namespace 1034 /// scope. 1035 void setLocalExternDecl() { 1036 Decl *Prev = getPreviousDecl(); 1037 IdentifierNamespace &= ~IDNS_Ordinary; 1038 1039 // It's OK for the declaration to still have the "invisible friend" flag or 1040 // the "conflicts with tag declarations in this scope" flag for the outer 1041 // scope. 1042 assert((IdentifierNamespace & ~(IDNS_OrdinaryFriend | IDNS_Tag)) == 0 && 1043 "namespace is not ordinary"); 1044 1045 IdentifierNamespace |= IDNS_LocalExtern; 1046 if (Prev && Prev->getIdentifierNamespace() & IDNS_Ordinary) 1047 IdentifierNamespace |= IDNS_Ordinary; 1048 } 1049 1050 /// Determine whether this is a block-scope declaration with linkage. 1051 /// This will either be a local variable declaration declared 'extern', or a 1052 /// local function declaration. 1053 bool isLocalExternDecl() { 1054 return IdentifierNamespace & IDNS_LocalExtern; 1055 } 1056 1057 /// Changes the namespace of this declaration to reflect that it's 1058 /// the object of a friend declaration. 1059 /// 1060 /// These declarations appear in the lexical context of the friending 1061 /// class, but in the semantic context of the actual entity. This property 1062 /// applies only to a specific decl object; other redeclarations of the 1063 /// same entity may not (and probably don't) share this property. 1064 void setObjectOfFriendDecl(bool PerformFriendInjection = false) { 1065 unsigned OldNS = IdentifierNamespace; 1066 assert((OldNS & (IDNS_Tag | IDNS_Ordinary | 1067 IDNS_TagFriend | IDNS_OrdinaryFriend | 1068 IDNS_LocalExtern | IDNS_NonMemberOperator)) && 1069 "namespace includes neither ordinary nor tag"); 1070 assert(!(OldNS & ~(IDNS_Tag | IDNS_Ordinary | IDNS_Type | 1071 IDNS_TagFriend | IDNS_OrdinaryFriend | 1072 IDNS_LocalExtern | IDNS_NonMemberOperator)) && 1073 "namespace includes other than ordinary or tag"); 1074 1075 Decl *Prev = getPreviousDecl(); 1076 IdentifierNamespace &= ~(IDNS_Ordinary | IDNS_Tag | IDNS_Type); 1077 1078 if (OldNS & (IDNS_Tag | IDNS_TagFriend)) { 1079 IdentifierNamespace |= IDNS_TagFriend; 1080 if (PerformFriendInjection || 1081 (Prev && Prev->getIdentifierNamespace() & IDNS_Tag)) 1082 IdentifierNamespace |= IDNS_Tag | IDNS_Type; 1083 } 1084 1085 if (OldNS & (IDNS_Ordinary | IDNS_OrdinaryFriend | 1086 IDNS_LocalExtern | IDNS_NonMemberOperator)) { 1087 IdentifierNamespace |= IDNS_OrdinaryFriend; 1088 if (PerformFriendInjection || 1089 (Prev && Prev->getIdentifierNamespace() & IDNS_Ordinary)) 1090 IdentifierNamespace |= IDNS_Ordinary; 1091 } 1092 } 1093 1094 enum FriendObjectKind { 1095 FOK_None, ///< Not a friend object. 1096 FOK_Declared, ///< A friend of a previously-declared entity. 1097 FOK_Undeclared ///< A friend of a previously-undeclared entity. 1098 }; 1099 1100 /// Determines whether this declaration is the object of a 1101 /// friend declaration and, if so, what kind. 1102 /// 1103 /// There is currently no direct way to find the associated FriendDecl. 1104 FriendObjectKind getFriendObjectKind() const { 1105 unsigned mask = 1106 (IdentifierNamespace & (IDNS_TagFriend | IDNS_OrdinaryFriend)); 1107 if (!mask) return FOK_None; 1108 return (IdentifierNamespace & (IDNS_Tag | IDNS_Ordinary) ? FOK_Declared 1109 : FOK_Undeclared); 1110 } 1111 1112 /// Specifies that this declaration is a C++ overloaded non-member. 1113 void setNonMemberOperator() { 1114 assert(getKind() == Function || getKind() == FunctionTemplate); 1115 assert((IdentifierNamespace & IDNS_Ordinary) && 1116 "visible non-member operators should be in ordinary namespace"); 1117 IdentifierNamespace |= IDNS_NonMemberOperator; 1118 } 1119 1120 static bool classofKind(Kind K) { return true; } 1121 static DeclContext *castToDeclContext(const Decl *); 1122 static Decl *castFromDeclContext(const DeclContext *); 1123 1124 void print(raw_ostream &Out, unsigned Indentation = 0, 1125 bool PrintInstantiation = false) const; 1126 void print(raw_ostream &Out, const PrintingPolicy &Policy, 1127 unsigned Indentation = 0, bool PrintInstantiation = false) const; 1128 static void printGroup(Decl** Begin, unsigned NumDecls, 1129 raw_ostream &Out, const PrintingPolicy &Policy, 1130 unsigned Indentation = 0); 1131 1132 // Debuggers don't usually respect default arguments. 1133 void dump() const; 1134 1135 // Same as dump(), but forces color printing. 1136 void dumpColor() const; 1137 1138 void dump(raw_ostream &Out, bool Deserialize = false) const; 1139 1140 /// \return Unique reproducible object identifier 1141 int64_t getID() const; 1142 1143 /// Looks through the Decl's underlying type to extract a FunctionType 1144 /// when possible. Will return null if the type underlying the Decl does not 1145 /// have a FunctionType. 1146 const FunctionType *getFunctionType(bool BlocksToo = true) const; 1147 1148 private: 1149 void setAttrsImpl(const AttrVec& Attrs, ASTContext &Ctx); 1150 void setDeclContextsImpl(DeclContext *SemaDC, DeclContext *LexicalDC, 1151 ASTContext &Ctx); 1152 1153 protected: 1154 ASTMutationListener *getASTMutationListener() const; 1155 }; 1156 1157 /// Determine whether two declarations declare the same entity. 1158 inline bool declaresSameEntity(const Decl *D1, const Decl *D2) { 1159 if (!D1 || !D2) 1160 return false; 1161 1162 if (D1 == D2) 1163 return true; 1164 1165 return D1->getCanonicalDecl() == D2->getCanonicalDecl(); 1166 } 1167 1168 /// PrettyStackTraceDecl - If a crash occurs, indicate that it happened when 1169 /// doing something to a specific decl. 1170 class PrettyStackTraceDecl : public llvm::PrettyStackTraceEntry { 1171 const Decl *TheDecl; 1172 SourceLocation Loc; 1173 SourceManager &SM; 1174 const char *Message; 1175 1176 public: 1177 PrettyStackTraceDecl(const Decl *theDecl, SourceLocation L, 1178 SourceManager &sm, const char *Msg) 1179 : TheDecl(theDecl), Loc(L), SM(sm), Message(Msg) {} 1180 1181 void print(raw_ostream &OS) const override; 1182 }; 1183 1184 /// The results of name lookup within a DeclContext. This is either a 1185 /// single result (with no stable storage) or a collection of results (with 1186 /// stable storage provided by the lookup table). 1187 class DeclContextLookupResult { 1188 using ResultTy = ArrayRef<NamedDecl *>; 1189 1190 ResultTy Result; 1191 1192 // If there is only one lookup result, it would be invalidated by 1193 // reallocations of the name table, so store it separately. 1194 NamedDecl *Single = nullptr; 1195 1196 static NamedDecl *const SingleElementDummyList; 1197 1198 public: 1199 DeclContextLookupResult() = default; 1200 DeclContextLookupResult(ArrayRef<NamedDecl *> Result) 1201 : Result(Result) {} 1202 DeclContextLookupResult(NamedDecl *Single) 1203 : Result(SingleElementDummyList), Single(Single) {} 1204 1205 class iterator; 1206 1207 using IteratorBase = 1208 llvm::iterator_adaptor_base<iterator, ResultTy::iterator, 1209 std::random_access_iterator_tag, 1210 NamedDecl *const>; 1211 1212 class iterator : public IteratorBase { 1213 value_type SingleElement; 1214 1215 public: 1216 explicit iterator(pointer Pos, value_type Single = nullptr) 1217 : IteratorBase(Pos), SingleElement(Single) {} 1218 1219 reference operator*() const { 1220 return SingleElement ? SingleElement : IteratorBase::operator*(); 1221 } 1222 }; 1223 1224 using const_iterator = iterator; 1225 using pointer = iterator::pointer; 1226 using reference = iterator::reference; 1227 1228 iterator begin() const { return iterator(Result.begin(), Single); } 1229 iterator end() const { return iterator(Result.end(), Single); } 1230 1231 bool empty() const { return Result.empty(); } 1232 pointer data() const { return Single ? &Single : Result.data(); } 1233 size_t size() const { return Single ? 1 : Result.size(); } 1234 reference front() const { return Single ? Single : Result.front(); } 1235 reference back() const { return Single ? Single : Result.back(); } 1236 reference operator[](size_t N) const { return Single ? Single : Result[N]; } 1237 1238 // FIXME: Remove this from the interface 1239 DeclContextLookupResult slice(size_t N) const { 1240 DeclContextLookupResult Sliced = Result.slice(N); 1241 Sliced.Single = Single; 1242 return Sliced; 1243 } 1244 }; 1245 1246 /// DeclContext - This is used only as base class of specific decl types that 1247 /// can act as declaration contexts. These decls are (only the top classes 1248 /// that directly derive from DeclContext are mentioned, not their subclasses): 1249 /// 1250 /// TranslationUnitDecl 1251 /// ExternCContext 1252 /// NamespaceDecl 1253 /// TagDecl 1254 /// OMPDeclareReductionDecl 1255 /// FunctionDecl 1256 /// ObjCMethodDecl 1257 /// ObjCContainerDecl 1258 /// LinkageSpecDecl 1259 /// ExportDecl 1260 /// BlockDecl 1261 /// CapturedDecl 1262 class DeclContext { 1263 /// For makeDeclVisibleInContextImpl 1264 friend class ASTDeclReader; 1265 /// For reconcileExternalVisibleStorage, CreateStoredDeclsMap, 1266 /// hasNeedToReconcileExternalVisibleStorage 1267 friend class ExternalASTSource; 1268 /// For CreateStoredDeclsMap 1269 friend class DependentDiagnostic; 1270 /// For hasNeedToReconcileExternalVisibleStorage, 1271 /// hasLazyLocalLexicalLookups, hasLazyExternalLexicalLookups 1272 friend class ASTWriter; 1273 1274 // We use uint64_t in the bit-fields below since some bit-fields 1275 // cross the unsigned boundary and this breaks the packing. 1276 1277 /// Stores the bits used by DeclContext. 1278 /// If modified NumDeclContextBit, the ctor of DeclContext and the accessor 1279 /// methods in DeclContext should be updated appropriately. 1280 class DeclContextBitfields { 1281 friend class DeclContext; 1282 /// DeclKind - This indicates which class this is. 1283 uint64_t DeclKind : 7; 1284 1285 /// Whether this declaration context also has some external 1286 /// storage that contains additional declarations that are lexically 1287 /// part of this context. 1288 mutable uint64_t ExternalLexicalStorage : 1; 1289 1290 /// Whether this declaration context also has some external 1291 /// storage that contains additional declarations that are visible 1292 /// in this context. 1293 mutable uint64_t ExternalVisibleStorage : 1; 1294 1295 /// Whether this declaration context has had externally visible 1296 /// storage added since the last lookup. In this case, \c LookupPtr's 1297 /// invariant may not hold and needs to be fixed before we perform 1298 /// another lookup. 1299 mutable uint64_t NeedToReconcileExternalVisibleStorage : 1; 1300 1301 /// If \c true, this context may have local lexical declarations 1302 /// that are missing from the lookup table. 1303 mutable uint64_t HasLazyLocalLexicalLookups : 1; 1304 1305 /// If \c true, the external source may have lexical declarations 1306 /// that are missing from the lookup table. 1307 mutable uint64_t HasLazyExternalLexicalLookups : 1; 1308 1309 /// If \c true, lookups should only return identifier from 1310 /// DeclContext scope (for example TranslationUnit). Used in 1311 /// LookupQualifiedName() 1312 mutable uint64_t UseQualifiedLookup : 1; 1313 }; 1314 1315 /// Number of bits in DeclContextBitfields. 1316 enum { NumDeclContextBits = 13 }; 1317 1318 /// Stores the bits used by TagDecl. 1319 /// If modified NumTagDeclBits and the accessor 1320 /// methods in TagDecl should be updated appropriately. 1321 class TagDeclBitfields { 1322 friend class TagDecl; 1323 /// For the bits in DeclContextBitfields 1324 uint64_t : NumDeclContextBits; 1325 1326 /// The TagKind enum. 1327 uint64_t TagDeclKind : 3; 1328 1329 /// True if this is a definition ("struct foo {};"), false if it is a 1330 /// declaration ("struct foo;"). It is not considered a definition 1331 /// until the definition has been fully processed. 1332 uint64_t IsCompleteDefinition : 1; 1333 1334 /// True if this is currently being defined. 1335 uint64_t IsBeingDefined : 1; 1336 1337 /// True if this tag declaration is "embedded" (i.e., defined or declared 1338 /// for the very first time) in the syntax of a declarator. 1339 uint64_t IsEmbeddedInDeclarator : 1; 1340 1341 /// True if this tag is free standing, e.g. "struct foo;". 1342 uint64_t IsFreeStanding : 1; 1343 1344 /// Indicates whether it is possible for declarations of this kind 1345 /// to have an out-of-date definition. 1346 /// 1347 /// This option is only enabled when modules are enabled. 1348 uint64_t MayHaveOutOfDateDef : 1; 1349 1350 /// Has the full definition of this type been required by a use somewhere in 1351 /// the TU. 1352 uint64_t IsCompleteDefinitionRequired : 1; 1353 }; 1354 1355 /// Number of non-inherited bits in TagDeclBitfields. 1356 enum { NumTagDeclBits = 9 }; 1357 1358 /// Stores the bits used by EnumDecl. 1359 /// If modified NumEnumDeclBit and the accessor 1360 /// methods in EnumDecl should be updated appropriately. 1361 class EnumDeclBitfields { 1362 friend class EnumDecl; 1363 /// For the bits in DeclContextBitfields. 1364 uint64_t : NumDeclContextBits; 1365 /// For the bits in TagDeclBitfields. 1366 uint64_t : NumTagDeclBits; 1367 1368 /// Width in bits required to store all the non-negative 1369 /// enumerators of this enum. 1370 uint64_t NumPositiveBits : 8; 1371 1372 /// Width in bits required to store all the negative 1373 /// enumerators of this enum. 1374 uint64_t NumNegativeBits : 8; 1375 1376 /// True if this tag declaration is a scoped enumeration. Only 1377 /// possible in C++11 mode. 1378 uint64_t IsScoped : 1; 1379 1380 /// If this tag declaration is a scoped enum, 1381 /// then this is true if the scoped enum was declared using the class 1382 /// tag, false if it was declared with the struct tag. No meaning is 1383 /// associated if this tag declaration is not a scoped enum. 1384 uint64_t IsScopedUsingClassTag : 1; 1385 1386 /// True if this is an enumeration with fixed underlying type. Only 1387 /// possible in C++11, Microsoft extensions, or Objective C mode. 1388 uint64_t IsFixed : 1; 1389 1390 /// True if a valid hash is stored in ODRHash. 1391 uint64_t HasODRHash : 1; 1392 }; 1393 1394 /// Number of non-inherited bits in EnumDeclBitfields. 1395 enum { NumEnumDeclBits = 20 }; 1396 1397 /// Stores the bits used by RecordDecl. 1398 /// If modified NumRecordDeclBits and the accessor 1399 /// methods in RecordDecl should be updated appropriately. 1400 class RecordDeclBitfields { 1401 friend class RecordDecl; 1402 /// For the bits in DeclContextBitfields. 1403 uint64_t : NumDeclContextBits; 1404 /// For the bits in TagDeclBitfields. 1405 uint64_t : NumTagDeclBits; 1406 1407 /// This is true if this struct ends with a flexible 1408 /// array member (e.g. int X[]) or if this union contains a struct that does. 1409 /// If so, this cannot be contained in arrays or other structs as a member. 1410 uint64_t HasFlexibleArrayMember : 1; 1411 1412 /// Whether this is the type of an anonymous struct or union. 1413 uint64_t AnonymousStructOrUnion : 1; 1414 1415 /// This is true if this struct has at least one member 1416 /// containing an Objective-C object pointer type. 1417 uint64_t HasObjectMember : 1; 1418 1419 /// This is true if struct has at least one member of 1420 /// 'volatile' type. 1421 uint64_t HasVolatileMember : 1; 1422 1423 /// Whether the field declarations of this record have been loaded 1424 /// from external storage. To avoid unnecessary deserialization of 1425 /// methods/nested types we allow deserialization of just the fields 1426 /// when needed. 1427 mutable uint64_t LoadedFieldsFromExternalStorage : 1; 1428 1429 /// Basic properties of non-trivial C structs. 1430 uint64_t NonTrivialToPrimitiveDefaultInitialize : 1; 1431 uint64_t NonTrivialToPrimitiveCopy : 1; 1432 uint64_t NonTrivialToPrimitiveDestroy : 1; 1433 1434 /// Indicates whether this struct is destroyed in the callee. 1435 uint64_t ParamDestroyedInCallee : 1; 1436 1437 /// Represents the way this type is passed to a function. 1438 uint64_t ArgPassingRestrictions : 2; 1439 }; 1440 1441 /// Number of non-inherited bits in RecordDeclBitfields. 1442 enum { NumRecordDeclBits = 11 }; 1443 1444 /// Stores the bits used by OMPDeclareReductionDecl. 1445 /// If modified NumOMPDeclareReductionDeclBits and the accessor 1446 /// methods in OMPDeclareReductionDecl should be updated appropriately. 1447 class OMPDeclareReductionDeclBitfields { 1448 friend class OMPDeclareReductionDecl; 1449 /// For the bits in DeclContextBitfields 1450 uint64_t : NumDeclContextBits; 1451 1452 /// Kind of initializer, 1453 /// function call or omp_priv<init_expr> initializtion. 1454 uint64_t InitializerKind : 2; 1455 }; 1456 1457 /// Number of non-inherited bits in OMPDeclareReductionDeclBitfields. 1458 enum { NumOMPDeclareReductionDeclBits = 2 }; 1459 1460 /// Stores the bits used by FunctionDecl. 1461 /// If modified NumFunctionDeclBits and the accessor 1462 /// methods in FunctionDecl and CXXDeductionGuideDecl 1463 /// (for IsCopyDeductionCandidate) should be updated appropriately. 1464 class FunctionDeclBitfields { 1465 friend class FunctionDecl; 1466 /// For IsCopyDeductionCandidate 1467 friend class CXXDeductionGuideDecl; 1468 /// For the bits in DeclContextBitfields. 1469 uint64_t : NumDeclContextBits; 1470 1471 uint64_t SClass : 3; 1472 uint64_t IsInline : 1; 1473 uint64_t IsInlineSpecified : 1; 1474 1475 /// This is shared by CXXConstructorDecl, 1476 /// CXXConversionDecl, and CXXDeductionGuideDecl. 1477 uint64_t IsExplicitSpecified : 1; 1478 1479 uint64_t IsVirtualAsWritten : 1; 1480 uint64_t IsPure : 1; 1481 uint64_t HasInheritedPrototype : 1; 1482 uint64_t HasWrittenPrototype : 1; 1483 uint64_t IsDeleted : 1; 1484 /// Used by CXXMethodDecl 1485 uint64_t IsTrivial : 1; 1486 1487 /// This flag indicates whether this function is trivial for the purpose of 1488 /// calls. This is meaningful only when this function is a copy/move 1489 /// constructor or a destructor. 1490 uint64_t IsTrivialForCall : 1; 1491 1492 /// Used by CXXMethodDecl 1493 uint64_t IsDefaulted : 1; 1494 /// Used by CXXMethodDecl 1495 uint64_t IsExplicitlyDefaulted : 1; 1496 uint64_t HasImplicitReturnZero : 1; 1497 uint64_t IsLateTemplateParsed : 1; 1498 uint64_t IsConstexpr : 1; 1499 uint64_t InstantiationIsPending : 1; 1500 1501 /// Indicates if the function uses __try. 1502 uint64_t UsesSEHTry : 1; 1503 1504 /// Indicates if the function was a definition 1505 /// but its body was skipped. 1506 uint64_t HasSkippedBody : 1; 1507 1508 /// Indicates if the function declaration will 1509 /// have a body, once we're done parsing it. 1510 uint64_t WillHaveBody : 1; 1511 1512 /// Indicates that this function is a multiversioned 1513 /// function using attribute 'target'. 1514 uint64_t IsMultiVersion : 1; 1515 1516 /// [C++17] Only used by CXXDeductionGuideDecl. Indicates that 1517 /// the Deduction Guide is the implicitly generated 'copy 1518 /// deduction candidate' (is used during overload resolution). 1519 uint64_t IsCopyDeductionCandidate : 1; 1520 1521 /// Store the ODRHash after first calculation. 1522 uint64_t HasODRHash : 1; 1523 }; 1524 1525 /// Number of non-inherited bits in FunctionDeclBitfields. 1526 enum { NumFunctionDeclBits = 25 }; 1527 1528 /// Stores the bits used by CXXConstructorDecl. If modified 1529 /// NumCXXConstructorDeclBits and the accessor 1530 /// methods in CXXConstructorDecl should be updated appropriately. 1531 class CXXConstructorDeclBitfields { 1532 friend class CXXConstructorDecl; 1533 /// For the bits in DeclContextBitfields. 1534 uint64_t : NumDeclContextBits; 1535 /// For the bits in FunctionDeclBitfields. 1536 uint64_t : NumFunctionDeclBits; 1537 1538 /// 25 bits to fit in the remaining availible space. 1539 /// Note that this makes CXXConstructorDeclBitfields take 1540 /// exactly 64 bits and thus the width of NumCtorInitializers 1541 /// will need to be shrunk if some bit is added to NumDeclContextBitfields, 1542 /// NumFunctionDeclBitfields or CXXConstructorDeclBitfields. 1543 uint64_t NumCtorInitializers : 25; 1544 uint64_t IsInheritingConstructor : 1; 1545 }; 1546 1547 /// Number of non-inherited bits in CXXConstructorDeclBitfields. 1548 enum { NumCXXConstructorDeclBits = 26 }; 1549 1550 /// Stores the bits used by ObjCMethodDecl. 1551 /// If modified NumObjCMethodDeclBits and the accessor 1552 /// methods in ObjCMethodDecl should be updated appropriately. 1553 class ObjCMethodDeclBitfields { 1554 friend class ObjCMethodDecl; 1555 1556 /// For the bits in DeclContextBitfields. 1557 uint64_t : NumDeclContextBits; 1558 1559 /// The conventional meaning of this method; an ObjCMethodFamily. 1560 /// This is not serialized; instead, it is computed on demand and 1561 /// cached. 1562 mutable uint64_t Family : ObjCMethodFamilyBitWidth; 1563 1564 /// instance (true) or class (false) method. 1565 uint64_t IsInstance : 1; 1566 uint64_t IsVariadic : 1; 1567 1568 /// True if this method is the getter or setter for an explicit property. 1569 uint64_t IsPropertyAccessor : 1; 1570 1571 /// Method has a definition. 1572 uint64_t IsDefined : 1; 1573 1574 /// Method redeclaration in the same interface. 1575 uint64_t IsRedeclaration : 1; 1576 1577 /// Is redeclared in the same interface. 1578 mutable uint64_t HasRedeclaration : 1; 1579 1580 /// \@required/\@optional 1581 uint64_t DeclImplementation : 2; 1582 1583 /// in, inout, etc. 1584 uint64_t objcDeclQualifier : 7; 1585 1586 /// Indicates whether this method has a related result type. 1587 uint64_t RelatedResultType : 1; 1588 1589 /// Whether the locations of the selector identifiers are in a 1590 /// "standard" position, a enum SelectorLocationsKind. 1591 uint64_t SelLocsKind : 2; 1592 1593 /// Whether this method overrides any other in the class hierarchy. 1594 /// 1595 /// A method is said to override any method in the class's 1596 /// base classes, its protocols, or its categories' protocols, that has 1597 /// the same selector and is of the same kind (class or instance). 1598 /// A method in an implementation is not considered as overriding the same 1599 /// method in the interface or its categories. 1600 uint64_t IsOverriding : 1; 1601 1602 /// Indicates if the method was a definition but its body was skipped. 1603 uint64_t HasSkippedBody : 1; 1604 }; 1605 1606 /// Number of non-inherited bits in ObjCMethodDeclBitfields. 1607 enum { NumObjCMethodDeclBits = 24 }; 1608 1609 /// Stores the bits used by ObjCContainerDecl. 1610 /// If modified NumObjCContainerDeclBits and the accessor 1611 /// methods in ObjCContainerDecl should be updated appropriately. 1612 class ObjCContainerDeclBitfields { 1613 friend class ObjCContainerDecl; 1614 /// For the bits in DeclContextBitfields 1615 uint32_t : NumDeclContextBits; 1616 1617 // Not a bitfield but this saves space. 1618 // Note that ObjCContainerDeclBitfields is full. 1619 SourceLocation AtStart; 1620 }; 1621 1622 /// Number of non-inherited bits in ObjCContainerDeclBitfields. 1623 /// Note that here we rely on the fact that SourceLocation is 32 bits 1624 /// wide. We check this with the static_assert in the ctor of DeclContext. 1625 enum { NumObjCContainerDeclBits = 64 - NumDeclContextBits }; 1626 1627 /// Stores the bits used by LinkageSpecDecl. 1628 /// If modified NumLinkageSpecDeclBits and the accessor 1629 /// methods in LinkageSpecDecl should be updated appropriately. 1630 class LinkageSpecDeclBitfields { 1631 friend class LinkageSpecDecl; 1632 /// For the bits in DeclContextBitfields. 1633 uint64_t : NumDeclContextBits; 1634 1635 /// The language for this linkage specification with values 1636 /// in the enum LinkageSpecDecl::LanguageIDs. 1637 uint64_t Language : 3; 1638 1639 /// True if this linkage spec has braces. 1640 /// This is needed so that hasBraces() returns the correct result while the 1641 /// linkage spec body is being parsed. Once RBraceLoc has been set this is 1642 /// not used, so it doesn't need to be serialized. 1643 uint64_t HasBraces : 1; 1644 }; 1645 1646 /// Number of non-inherited bits in LinkageSpecDeclBitfields. 1647 enum { NumLinkageSpecDeclBits = 4 }; 1648 1649 /// Stores the bits used by BlockDecl. 1650 /// If modified NumBlockDeclBits and the accessor 1651 /// methods in BlockDecl should be updated appropriately. 1652 class BlockDeclBitfields { 1653 friend class BlockDecl; 1654 /// For the bits in DeclContextBitfields. 1655 uint64_t : NumDeclContextBits; 1656 1657 uint64_t IsVariadic : 1; 1658 uint64_t CapturesCXXThis : 1; 1659 uint64_t BlockMissingReturnType : 1; 1660 uint64_t IsConversionFromLambda : 1; 1661 1662 /// A bit that indicates this block is passed directly to a function as a 1663 /// non-escaping parameter. 1664 uint64_t DoesNotEscape : 1; 1665 }; 1666 1667 /// Number of non-inherited bits in BlockDeclBitfields. 1668 enum { NumBlockDeclBits = 5 }; 1669 1670 /// Pointer to the data structure used to lookup declarations 1671 /// within this context (or a DependentStoredDeclsMap if this is a 1672 /// dependent context). We maintain the invariant that, if the map 1673 /// contains an entry for a DeclarationName (and we haven't lazily 1674 /// omitted anything), then it contains all relevant entries for that 1675 /// name (modulo the hasExternalDecls() flag). 1676 mutable StoredDeclsMap *LookupPtr = nullptr; 1677 1678 protected: 1679 /// This anonymous union stores the bits belonging to DeclContext and classes 1680 /// deriving from it. The goal is to use otherwise wasted 1681 /// space in DeclContext to store data belonging to derived classes. 1682 /// The space saved is especially significient when pointers are aligned 1683 /// to 8 bytes. In this case due to alignment requirements we have a 1684 /// little less than 8 bytes free in DeclContext which we can use. 1685 /// We check that none of the classes in this union is larger than 1686 /// 8 bytes with static_asserts in the ctor of DeclContext. 1687 union { 1688 DeclContextBitfields DeclContextBits; 1689 TagDeclBitfields TagDeclBits; 1690 EnumDeclBitfields EnumDeclBits; 1691 RecordDeclBitfields RecordDeclBits; 1692 OMPDeclareReductionDeclBitfields OMPDeclareReductionDeclBits; 1693 FunctionDeclBitfields FunctionDeclBits; 1694 CXXConstructorDeclBitfields CXXConstructorDeclBits; 1695 ObjCMethodDeclBitfields ObjCMethodDeclBits; 1696 ObjCContainerDeclBitfields ObjCContainerDeclBits; 1697 LinkageSpecDeclBitfields LinkageSpecDeclBits; 1698 BlockDeclBitfields BlockDeclBits; 1699 1700 static_assert(sizeof(DeclContextBitfields) <= 8, 1701 "DeclContextBitfields is larger than 8 bytes!"); 1702 static_assert(sizeof(TagDeclBitfields) <= 8, 1703 "TagDeclBitfields is larger than 8 bytes!"); 1704 static_assert(sizeof(EnumDeclBitfields) <= 8, 1705 "EnumDeclBitfields is larger than 8 bytes!"); 1706 static_assert(sizeof(RecordDeclBitfields) <= 8, 1707 "RecordDeclBitfields is larger than 8 bytes!"); 1708 static_assert(sizeof(OMPDeclareReductionDeclBitfields) <= 8, 1709 "OMPDeclareReductionDeclBitfields is larger than 8 bytes!"); 1710 static_assert(sizeof(FunctionDeclBitfields) <= 8, 1711 "FunctionDeclBitfields is larger than 8 bytes!"); 1712 static_assert(sizeof(CXXConstructorDeclBitfields) <= 8, 1713 "CXXConstructorDeclBitfields is larger than 8 bytes!"); 1714 static_assert(sizeof(ObjCMethodDeclBitfields) <= 8, 1715 "ObjCMethodDeclBitfields is larger than 8 bytes!"); 1716 static_assert(sizeof(ObjCContainerDeclBitfields) <= 8, 1717 "ObjCContainerDeclBitfields is larger than 8 bytes!"); 1718 static_assert(sizeof(LinkageSpecDeclBitfields) <= 8, 1719 "LinkageSpecDeclBitfields is larger than 8 bytes!"); 1720 static_assert(sizeof(BlockDeclBitfields) <= 8, 1721 "BlockDeclBitfields is larger than 8 bytes!"); 1722 }; 1723 1724 /// FirstDecl - The first declaration stored within this declaration 1725 /// context. 1726 mutable Decl *FirstDecl = nullptr; 1727 1728 /// LastDecl - The last declaration stored within this declaration 1729 /// context. FIXME: We could probably cache this value somewhere 1730 /// outside of the DeclContext, to reduce the size of DeclContext by 1731 /// another pointer. 1732 mutable Decl *LastDecl = nullptr; 1733 1734 /// Build up a chain of declarations. 1735 /// 1736 /// \returns the first/last pair of declarations. 1737 static std::pair<Decl *, Decl *> 1738 BuildDeclChain(ArrayRef<Decl*> Decls, bool FieldsAlreadyLoaded); 1739 1740 DeclContext(Decl::Kind K); 1741 1742 public: 1743 ~DeclContext(); 1744 1745 Decl::Kind getDeclKind() const { 1746 return static_cast<Decl::Kind>(DeclContextBits.DeclKind); 1747 } 1748 1749 const char *getDeclKindName() const; 1750 1751 /// getParent - Returns the containing DeclContext. 1752 DeclContext *getParent() { 1753 return cast<Decl>(this)->getDeclContext(); 1754 } 1755 const DeclContext *getParent() const { 1756 return const_cast<DeclContext*>(this)->getParent(); 1757 } 1758 1759 /// getLexicalParent - Returns the containing lexical DeclContext. May be 1760 /// different from getParent, e.g.: 1761 /// 1762 /// namespace A { 1763 /// struct S; 1764 /// } 1765 /// struct A::S {}; // getParent() == namespace 'A' 1766 /// // getLexicalParent() == translation unit 1767 /// 1768 DeclContext *getLexicalParent() { 1769 return cast<Decl>(this)->getLexicalDeclContext(); 1770 } 1771 const DeclContext *getLexicalParent() const { 1772 return const_cast<DeclContext*>(this)->getLexicalParent(); 1773 } 1774 1775 DeclContext *getLookupParent(); 1776 1777 const DeclContext *getLookupParent() const { 1778 return const_cast<DeclContext*>(this)->getLookupParent(); 1779 } 1780 1781 ASTContext &getParentASTContext() const { 1782 return cast<Decl>(this)->getASTContext(); 1783 } 1784 1785 bool isClosure() const { return getDeclKind() == Decl::Block; } 1786 1787 bool isObjCContainer() const { 1788 switch (getDeclKind()) { 1789 case Decl::ObjCCategory: 1790 case Decl::ObjCCategoryImpl: 1791 case Decl::ObjCImplementation: 1792 case Decl::ObjCInterface: 1793 case Decl::ObjCProtocol: 1794 return true; 1795 default: 1796 return false; 1797 } 1798 } 1799 1800 bool isFunctionOrMethod() const { 1801 switch (getDeclKind()) { 1802 case Decl::Block: 1803 case Decl::Captured: 1804 case Decl::ObjCMethod: 1805 return true; 1806 default: 1807 return getDeclKind() >= Decl::firstFunction && 1808 getDeclKind() <= Decl::lastFunction; 1809 } 1810 } 1811 1812 /// Test whether the context supports looking up names. 1813 bool isLookupContext() const { 1814 return !isFunctionOrMethod() && getDeclKind() != Decl::LinkageSpec && 1815 getDeclKind() != Decl::Export; 1816 } 1817 1818 bool isFileContext() const { 1819 return getDeclKind() == Decl::TranslationUnit || 1820 getDeclKind() == Decl::Namespace; 1821 } 1822 1823 bool isTranslationUnit() const { 1824 return getDeclKind() == Decl::TranslationUnit; 1825 } 1826 1827 bool isRecord() const { 1828 return getDeclKind() >= Decl::firstRecord && 1829 getDeclKind() <= Decl::lastRecord; 1830 } 1831 1832 bool isNamespace() const { return getDeclKind() == Decl::Namespace; } 1833 1834 bool isStdNamespace() const; 1835 1836 bool isInlineNamespace() const; 1837 1838 /// Determines whether this context is dependent on a 1839 /// template parameter. 1840 bool isDependentContext() const; 1841 1842 /// isTransparentContext - Determines whether this context is a 1843 /// "transparent" context, meaning that the members declared in this 1844 /// context are semantically declared in the nearest enclosing 1845 /// non-transparent (opaque) context but are lexically declared in 1846 /// this context. For example, consider the enumerators of an 1847 /// enumeration type: 1848 /// @code 1849 /// enum E { 1850 /// Val1 1851 /// }; 1852 /// @endcode 1853 /// Here, E is a transparent context, so its enumerator (Val1) will 1854 /// appear (semantically) that it is in the same context of E. 1855 /// Examples of transparent contexts include: enumerations (except for 1856 /// C++0x scoped enums), and C++ linkage specifications. 1857 bool isTransparentContext() const; 1858 1859 /// Determines whether this context or some of its ancestors is a 1860 /// linkage specification context that specifies C linkage. 1861 bool isExternCContext() const; 1862 1863 /// Retrieve the nearest enclosing C linkage specification context. 1864 const LinkageSpecDecl *getExternCContext() const; 1865 1866 /// Determines whether this context or some of its ancestors is a 1867 /// linkage specification context that specifies C++ linkage. 1868 bool isExternCXXContext() const; 1869 1870 /// Determine whether this declaration context is equivalent 1871 /// to the declaration context DC. 1872 bool Equals(const DeclContext *DC) const { 1873 return DC && this->getPrimaryContext() == DC->getPrimaryContext(); 1874 } 1875 1876 /// Determine whether this declaration context encloses the 1877 /// declaration context DC. 1878 bool Encloses(const DeclContext *DC) const; 1879 1880 /// Find the nearest non-closure ancestor of this context, 1881 /// i.e. the innermost semantic parent of this context which is not 1882 /// a closure. A context may be its own non-closure ancestor. 1883 Decl *getNonClosureAncestor(); 1884 const Decl *getNonClosureAncestor() const { 1885 return const_cast<DeclContext*>(this)->getNonClosureAncestor(); 1886 } 1887 1888 /// getPrimaryContext - There may be many different 1889 /// declarations of the same entity (including forward declarations 1890 /// of classes, multiple definitions of namespaces, etc.), each with 1891 /// a different set of declarations. This routine returns the 1892 /// "primary" DeclContext structure, which will contain the 1893 /// information needed to perform name lookup into this context. 1894 DeclContext *getPrimaryContext(); 1895 const DeclContext *getPrimaryContext() const { 1896 return const_cast<DeclContext*>(this)->getPrimaryContext(); 1897 } 1898 1899 /// getRedeclContext - Retrieve the context in which an entity conflicts with 1900 /// other entities of the same name, or where it is a redeclaration if the 1901 /// two entities are compatible. This skips through transparent contexts. 1902 DeclContext *getRedeclContext(); 1903 const DeclContext *getRedeclContext() const { 1904 return const_cast<DeclContext *>(this)->getRedeclContext(); 1905 } 1906 1907 /// Retrieve the nearest enclosing namespace context. 1908 DeclContext *getEnclosingNamespaceContext(); 1909 const DeclContext *getEnclosingNamespaceContext() const { 1910 return const_cast<DeclContext *>(this)->getEnclosingNamespaceContext(); 1911 } 1912 1913 /// Retrieve the outermost lexically enclosing record context. 1914 RecordDecl *getOuterLexicalRecordContext(); 1915 const RecordDecl *getOuterLexicalRecordContext() const { 1916 return const_cast<DeclContext *>(this)->getOuterLexicalRecordContext(); 1917 } 1918 1919 /// Test if this context is part of the enclosing namespace set of 1920 /// the context NS, as defined in C++0x [namespace.def]p9. If either context 1921 /// isn't a namespace, this is equivalent to Equals(). 1922 /// 1923 /// The enclosing namespace set of a namespace is the namespace and, if it is 1924 /// inline, its enclosing namespace, recursively. 1925 bool InEnclosingNamespaceSetOf(const DeclContext *NS) const; 1926 1927 /// Collects all of the declaration contexts that are semantically 1928 /// connected to this declaration context. 1929 /// 1930 /// For declaration contexts that have multiple semantically connected but 1931 /// syntactically distinct contexts, such as C++ namespaces, this routine 1932 /// retrieves the complete set of such declaration contexts in source order. 1933 /// For example, given: 1934 /// 1935 /// \code 1936 /// namespace N { 1937 /// int x; 1938 /// } 1939 /// namespace N { 1940 /// int y; 1941 /// } 1942 /// \endcode 1943 /// 1944 /// The \c Contexts parameter will contain both definitions of N. 1945 /// 1946 /// \param Contexts Will be cleared and set to the set of declaration 1947 /// contexts that are semanticaly connected to this declaration context, 1948 /// in source order, including this context (which may be the only result, 1949 /// for non-namespace contexts). 1950 void collectAllContexts(SmallVectorImpl<DeclContext *> &Contexts); 1951 1952 /// decl_iterator - Iterates through the declarations stored 1953 /// within this context. 1954 class decl_iterator { 1955 /// Current - The current declaration. 1956 Decl *Current = nullptr; 1957 1958 public: 1959 using value_type = Decl *; 1960 using reference = const value_type &; 1961 using pointer = const value_type *; 1962 using iterator_category = std::forward_iterator_tag; 1963 using difference_type = std::ptrdiff_t; 1964 1965 decl_iterator() = default; 1966 explicit decl_iterator(Decl *C) : Current(C) {} 1967 1968 reference operator*() const { return Current; } 1969 1970 // This doesn't meet the iterator requirements, but it's convenient 1971 value_type operator->() const { return Current; } 1972 1973 decl_iterator& operator++() { 1974 Current = Current->getNextDeclInContext(); 1975 return *this; 1976 } 1977 1978 decl_iterator operator++(int) { 1979 decl_iterator tmp(*this); 1980 ++(*this); 1981 return tmp; 1982 } 1983 1984 friend bool operator==(decl_iterator x, decl_iterator y) { 1985 return x.Current == y.Current; 1986 } 1987 1988 friend bool operator!=(decl_iterator x, decl_iterator y) { 1989 return x.Current != y.Current; 1990 } 1991 }; 1992 1993 using decl_range = llvm::iterator_range<decl_iterator>; 1994 1995 /// decls_begin/decls_end - Iterate over the declarations stored in 1996 /// this context. 1997 decl_range decls() const { return decl_range(decls_begin(), decls_end()); } 1998 decl_iterator decls_begin() const; 1999 decl_iterator decls_end() const { return decl_iterator(); } 2000 bool decls_empty() const; 2001 2002 /// noload_decls_begin/end - Iterate over the declarations stored in this 2003 /// context that are currently loaded; don't attempt to retrieve anything 2004 /// from an external source. 2005 decl_range noload_decls() const { 2006 return decl_range(noload_decls_begin(), noload_decls_end()); 2007 } 2008 decl_iterator noload_decls_begin() const { return decl_iterator(FirstDecl); } 2009 decl_iterator noload_decls_end() const { return decl_iterator(); } 2010 2011 /// specific_decl_iterator - Iterates over a subrange of 2012 /// declarations stored in a DeclContext, providing only those that 2013 /// are of type SpecificDecl (or a class derived from it). This 2014 /// iterator is used, for example, to provide iteration over just 2015 /// the fields within a RecordDecl (with SpecificDecl = FieldDecl). 2016 template<typename SpecificDecl> 2017 class specific_decl_iterator { 2018 /// Current - The current, underlying declaration iterator, which 2019 /// will either be NULL or will point to a declaration of 2020 /// type SpecificDecl. 2021 DeclContext::decl_iterator Current; 2022 2023 /// SkipToNextDecl - Advances the current position up to the next 2024 /// declaration of type SpecificDecl that also meets the criteria 2025 /// required by Acceptable. 2026 void SkipToNextDecl() { 2027 while (*Current && !isa<SpecificDecl>(*Current)) 2028 ++Current; 2029 } 2030 2031 public: 2032 using value_type = SpecificDecl *; 2033 // TODO: Add reference and pointer types (with some appropriate proxy type) 2034 // if we ever have a need for them. 2035 using reference = void; 2036 using pointer = void; 2037 using difference_type = 2038 std::iterator_traits<DeclContext::decl_iterator>::difference_type; 2039 using iterator_category = std::forward_iterator_tag; 2040 2041 specific_decl_iterator() = default; 2042 2043 /// specific_decl_iterator - Construct a new iterator over a 2044 /// subset of the declarations the range [C, 2045 /// end-of-declarations). If A is non-NULL, it is a pointer to a 2046 /// member function of SpecificDecl that should return true for 2047 /// all of the SpecificDecl instances that will be in the subset 2048 /// of iterators. For example, if you want Objective-C instance 2049 /// methods, SpecificDecl will be ObjCMethodDecl and A will be 2050 /// &ObjCMethodDecl::isInstanceMethod. 2051 explicit specific_decl_iterator(DeclContext::decl_iterator C) : Current(C) { 2052 SkipToNextDecl(); 2053 } 2054 2055 value_type operator*() const { return cast<SpecificDecl>(*Current); } 2056 2057 // This doesn't meet the iterator requirements, but it's convenient 2058 value_type operator->() const { return **this; } 2059 2060 specific_decl_iterator& operator++() { 2061 ++Current; 2062 SkipToNextDecl(); 2063 return *this; 2064 } 2065 2066 specific_decl_iterator operator++(int) { 2067 specific_decl_iterator tmp(*this); 2068 ++(*this); 2069 return tmp; 2070 } 2071 2072 friend bool operator==(const specific_decl_iterator& x, 2073 const specific_decl_iterator& y) { 2074 return x.Current == y.Current; 2075 } 2076 2077 friend bool operator!=(const specific_decl_iterator& x, 2078 const specific_decl_iterator& y) { 2079 return x.Current != y.Current; 2080 } 2081 }; 2082 2083 /// Iterates over a filtered subrange of declarations stored 2084 /// in a DeclContext. 2085 /// 2086 /// This iterator visits only those declarations that are of type 2087 /// SpecificDecl (or a class derived from it) and that meet some 2088 /// additional run-time criteria. This iterator is used, for 2089 /// example, to provide access to the instance methods within an 2090 /// Objective-C interface (with SpecificDecl = ObjCMethodDecl and 2091 /// Acceptable = ObjCMethodDecl::isInstanceMethod). 2092 template<typename SpecificDecl, bool (SpecificDecl::*Acceptable)() const> 2093 class filtered_decl_iterator { 2094 /// Current - The current, underlying declaration iterator, which 2095 /// will either be NULL or will point to a declaration of 2096 /// type SpecificDecl. 2097 DeclContext::decl_iterator Current; 2098 2099 /// SkipToNextDecl - Advances the current position up to the next 2100 /// declaration of type SpecificDecl that also meets the criteria 2101 /// required by Acceptable. 2102 void SkipToNextDecl() { 2103 while (*Current && 2104 (!isa<SpecificDecl>(*Current) || 2105 (Acceptable && !(cast<SpecificDecl>(*Current)->*Acceptable)()))) 2106 ++Current; 2107 } 2108 2109 public: 2110 using value_type = SpecificDecl *; 2111 // TODO: Add reference and pointer types (with some appropriate proxy type) 2112 // if we ever have a need for them. 2113 using reference = void; 2114 using pointer = void; 2115 using difference_type = 2116 std::iterator_traits<DeclContext::decl_iterator>::difference_type; 2117 using iterator_category = std::forward_iterator_tag; 2118 2119 filtered_decl_iterator() = default; 2120 2121 /// filtered_decl_iterator - Construct a new iterator over a 2122 /// subset of the declarations the range [C, 2123 /// end-of-declarations). If A is non-NULL, it is a pointer to a 2124 /// member function of SpecificDecl that should return true for 2125 /// all of the SpecificDecl instances that will be in the subset 2126 /// of iterators. For example, if you want Objective-C instance 2127 /// methods, SpecificDecl will be ObjCMethodDecl and A will be 2128 /// &ObjCMethodDecl::isInstanceMethod. 2129 explicit filtered_decl_iterator(DeclContext::decl_iterator C) : Current(C) { 2130 SkipToNextDecl(); 2131 } 2132 2133 value_type operator*() const { return cast<SpecificDecl>(*Current); } 2134 value_type operator->() const { return cast<SpecificDecl>(*Current); } 2135 2136 filtered_decl_iterator& operator++() { 2137 ++Current; 2138 SkipToNextDecl(); 2139 return *this; 2140 } 2141 2142 filtered_decl_iterator operator++(int) { 2143 filtered_decl_iterator tmp(*this); 2144 ++(*this); 2145 return tmp; 2146 } 2147 2148 friend bool operator==(const filtered_decl_iterator& x, 2149 const filtered_decl_iterator& y) { 2150 return x.Current == y.Current; 2151 } 2152 2153 friend bool operator!=(const filtered_decl_iterator& x, 2154 const filtered_decl_iterator& y) { 2155 return x.Current != y.Current; 2156 } 2157 }; 2158 2159 /// Add the declaration D into this context. 2160 /// 2161 /// This routine should be invoked when the declaration D has first 2162 /// been declared, to place D into the context where it was 2163 /// (lexically) defined. Every declaration must be added to one 2164 /// (and only one!) context, where it can be visited via 2165 /// [decls_begin(), decls_end()). Once a declaration has been added 2166 /// to its lexical context, the corresponding DeclContext owns the 2167 /// declaration. 2168 /// 2169 /// If D is also a NamedDecl, it will be made visible within its 2170 /// semantic context via makeDeclVisibleInContext. 2171 void addDecl(Decl *D); 2172 2173 /// Add the declaration D into this context, but suppress 2174 /// searches for external declarations with the same name. 2175 /// 2176 /// Although analogous in function to addDecl, this removes an 2177 /// important check. This is only useful if the Decl is being 2178 /// added in response to an external search; in all other cases, 2179 /// addDecl() is the right function to use. 2180 /// See the ASTImporter for use cases. 2181 void addDeclInternal(Decl *D); 2182 2183 /// Add the declaration D to this context without modifying 2184 /// any lookup tables. 2185 /// 2186 /// This is useful for some operations in dependent contexts where 2187 /// the semantic context might not be dependent; this basically 2188 /// only happens with friends. 2189 void addHiddenDecl(Decl *D); 2190 2191 /// Removes a declaration from this context. 2192 void removeDecl(Decl *D); 2193 2194 /// Checks whether a declaration is in this context. 2195 bool containsDecl(Decl *D) const; 2196 2197 /// Checks whether a declaration is in this context. 2198 /// This also loads the Decls from the external source before the check. 2199 bool containsDeclAndLoad(Decl *D) const; 2200 2201 using lookup_result = DeclContextLookupResult; 2202 using lookup_iterator = lookup_result::iterator; 2203 2204 /// lookup - Find the declarations (if any) with the given Name in 2205 /// this context. Returns a range of iterators that contains all of 2206 /// the declarations with this name, with object, function, member, 2207 /// and enumerator names preceding any tag name. Note that this 2208 /// routine will not look into parent contexts. 2209 lookup_result lookup(DeclarationName Name) const; 2210 2211 /// Find the declarations with the given name that are visible 2212 /// within this context; don't attempt to retrieve anything from an 2213 /// external source. 2214 lookup_result noload_lookup(DeclarationName Name); 2215 2216 /// A simplistic name lookup mechanism that performs name lookup 2217 /// into this declaration context without consulting the external source. 2218 /// 2219 /// This function should almost never be used, because it subverts the 2220 /// usual relationship between a DeclContext and the external source. 2221 /// See the ASTImporter for the (few, but important) use cases. 2222 /// 2223 /// FIXME: This is very inefficient; replace uses of it with uses of 2224 /// noload_lookup. 2225 void localUncachedLookup(DeclarationName Name, 2226 SmallVectorImpl<NamedDecl *> &Results); 2227 2228 /// Makes a declaration visible within this context. 2229 /// 2230 /// This routine makes the declaration D visible to name lookup 2231 /// within this context and, if this is a transparent context, 2232 /// within its parent contexts up to the first enclosing 2233 /// non-transparent context. Making a declaration visible within a 2234 /// context does not transfer ownership of a declaration, and a 2235 /// declaration can be visible in many contexts that aren't its 2236 /// lexical context. 2237 /// 2238 /// If D is a redeclaration of an existing declaration that is 2239 /// visible from this context, as determined by 2240 /// NamedDecl::declarationReplaces, the previous declaration will be 2241 /// replaced with D. 2242 void makeDeclVisibleInContext(NamedDecl *D); 2243 2244 /// all_lookups_iterator - An iterator that provides a view over the results 2245 /// of looking up every possible name. 2246 class all_lookups_iterator; 2247 2248 using lookups_range = llvm::iterator_range<all_lookups_iterator>; 2249 2250 lookups_range lookups() const; 2251 // Like lookups(), but avoids loading external declarations. 2252 // If PreserveInternalState, avoids building lookup data structures too. 2253 lookups_range noload_lookups(bool PreserveInternalState) const; 2254 2255 /// Iterators over all possible lookups within this context. 2256 all_lookups_iterator lookups_begin() const; 2257 all_lookups_iterator lookups_end() const; 2258 2259 /// Iterators over all possible lookups within this context that are 2260 /// currently loaded; don't attempt to retrieve anything from an external 2261 /// source. 2262 all_lookups_iterator noload_lookups_begin() const; 2263 all_lookups_iterator noload_lookups_end() const; 2264 2265 struct udir_iterator; 2266 2267 using udir_iterator_base = 2268 llvm::iterator_adaptor_base<udir_iterator, lookup_iterator, 2269 std::random_access_iterator_tag, 2270 UsingDirectiveDecl *>; 2271 2272 struct udir_iterator : udir_iterator_base { 2273 udir_iterator(lookup_iterator I) : udir_iterator_base(I) {} 2274 2275 UsingDirectiveDecl *operator*() const; 2276 }; 2277 2278 using udir_range = llvm::iterator_range<udir_iterator>; 2279 2280 udir_range using_directives() const; 2281 2282 // These are all defined in DependentDiagnostic.h. 2283 class ddiag_iterator; 2284 2285 using ddiag_range = llvm::iterator_range<DeclContext::ddiag_iterator>; 2286 2287 inline ddiag_range ddiags() const; 2288 2289 // Low-level accessors 2290 2291 /// Mark that there are external lexical declarations that we need 2292 /// to include in our lookup table (and that are not available as external 2293 /// visible lookups). These extra lookup results will be found by walking 2294 /// the lexical declarations of this context. This should be used only if 2295 /// setHasExternalLexicalStorage() has been called on any decl context for 2296 /// which this is the primary context. 2297 void setMustBuildLookupTable() { 2298 assert(this == getPrimaryContext() && 2299 "should only be called on primary context"); 2300 DeclContextBits.HasLazyExternalLexicalLookups = true; 2301 } 2302 2303 /// Retrieve the internal representation of the lookup structure. 2304 /// This may omit some names if we are lazily building the structure. 2305 StoredDeclsMap *getLookupPtr() const { return LookupPtr; } 2306 2307 /// Ensure the lookup structure is fully-built and return it. 2308 StoredDeclsMap *buildLookup(); 2309 2310 /// Whether this DeclContext has external storage containing 2311 /// additional declarations that are lexically in this context. 2312 bool hasExternalLexicalStorage() const { 2313 return DeclContextBits.ExternalLexicalStorage; 2314 } 2315 2316 /// State whether this DeclContext has external storage for 2317 /// declarations lexically in this context. 2318 void setHasExternalLexicalStorage(bool ES = true) const { 2319 DeclContextBits.ExternalLexicalStorage = ES; 2320 } 2321 2322 /// Whether this DeclContext has external storage containing 2323 /// additional declarations that are visible in this context. 2324 bool hasExternalVisibleStorage() const { 2325 return DeclContextBits.ExternalVisibleStorage; 2326 } 2327 2328 /// State whether this DeclContext has external storage for 2329 /// declarations visible in this context. 2330 void setHasExternalVisibleStorage(bool ES = true) const { 2331 DeclContextBits.ExternalVisibleStorage = ES; 2332 if (ES && LookupPtr) 2333 DeclContextBits.NeedToReconcileExternalVisibleStorage = true; 2334 } 2335 2336 /// Determine whether the given declaration is stored in the list of 2337 /// declarations lexically within this context. 2338 bool isDeclInLexicalTraversal(const Decl *D) const { 2339 return D && (D->NextInContextAndBits.getPointer() || D == FirstDecl || 2340 D == LastDecl); 2341 } 2342 2343 bool setUseQualifiedLookup(bool use = true) const { 2344 bool old_value = DeclContextBits.UseQualifiedLookup; 2345 DeclContextBits.UseQualifiedLookup = use; 2346 return old_value; 2347 } 2348 2349 bool shouldUseQualifiedLookup() const { 2350 return DeclContextBits.UseQualifiedLookup; 2351 } 2352 2353 static bool classof(const Decl *D); 2354 static bool classof(const DeclContext *D) { return true; } 2355 2356 void dumpDeclContext() const; 2357 void dumpLookups() const; 2358 void dumpLookups(llvm::raw_ostream &OS, bool DumpDecls = false, 2359 bool Deserialize = false) const; 2360 2361 private: 2362 /// Whether this declaration context has had externally visible 2363 /// storage added since the last lookup. In this case, \c LookupPtr's 2364 /// invariant may not hold and needs to be fixed before we perform 2365 /// another lookup. 2366 bool hasNeedToReconcileExternalVisibleStorage() const { 2367 return DeclContextBits.NeedToReconcileExternalVisibleStorage; 2368 } 2369 2370 /// State that this declaration context has had externally visible 2371 /// storage added since the last lookup. In this case, \c LookupPtr's 2372 /// invariant may not hold and needs to be fixed before we perform 2373 /// another lookup. 2374 void setNeedToReconcileExternalVisibleStorage(bool Need = true) const { 2375 DeclContextBits.NeedToReconcileExternalVisibleStorage = Need; 2376 } 2377 2378 /// If \c true, this context may have local lexical declarations 2379 /// that are missing from the lookup table. 2380 bool hasLazyLocalLexicalLookups() const { 2381 return DeclContextBits.HasLazyLocalLexicalLookups; 2382 } 2383 2384 /// If \c true, this context may have local lexical declarations 2385 /// that are missing from the lookup table. 2386 void setHasLazyLocalLexicalLookups(bool HasLLLL = true) const { 2387 DeclContextBits.HasLazyLocalLexicalLookups = HasLLLL; 2388 } 2389 2390 /// If \c true, the external source may have lexical declarations 2391 /// that are missing from the lookup table. 2392 bool hasLazyExternalLexicalLookups() const { 2393 return DeclContextBits.HasLazyExternalLexicalLookups; 2394 } 2395 2396 /// If \c true, the external source may have lexical declarations 2397 /// that are missing from the lookup table. 2398 void setHasLazyExternalLexicalLookups(bool HasLELL = true) const { 2399 DeclContextBits.HasLazyExternalLexicalLookups = HasLELL; 2400 } 2401 2402 void reconcileExternalVisibleStorage() const; 2403 bool LoadLexicalDeclsFromExternalStorage() const; 2404 2405 /// Makes a declaration visible within this context, but 2406 /// suppresses searches for external declarations with the same 2407 /// name. 2408 /// 2409 /// Analogous to makeDeclVisibleInContext, but for the exclusive 2410 /// use of addDeclInternal(). 2411 void makeDeclVisibleInContextInternal(NamedDecl *D); 2412 2413 StoredDeclsMap *CreateStoredDeclsMap(ASTContext &C) const; 2414 2415 void loadLazyLocalLexicalLookups(); 2416 void buildLookupImpl(DeclContext *DCtx, bool Internal); 2417 void makeDeclVisibleInContextWithFlags(NamedDecl *D, bool Internal, 2418 bool Rediscoverable); 2419 void makeDeclVisibleInContextImpl(NamedDecl *D, bool Internal); 2420 }; 2421 2422 inline bool Decl::isTemplateParameter() const { 2423 return getKind() == TemplateTypeParm || getKind() == NonTypeTemplateParm || 2424 getKind() == TemplateTemplateParm; 2425 } 2426 2427 // Specialization selected when ToTy is not a known subclass of DeclContext. 2428 template <class ToTy, 2429 bool IsKnownSubtype = ::std::is_base_of<DeclContext, ToTy>::value> 2430 struct cast_convert_decl_context { 2431 static const ToTy *doit(const DeclContext *Val) { 2432 return static_cast<const ToTy*>(Decl::castFromDeclContext(Val)); 2433 } 2434 2435 static ToTy *doit(DeclContext *Val) { 2436 return static_cast<ToTy*>(Decl::castFromDeclContext(Val)); 2437 } 2438 }; 2439 2440 // Specialization selected when ToTy is a known subclass of DeclContext. 2441 template <class ToTy> 2442 struct cast_convert_decl_context<ToTy, true> { 2443 static const ToTy *doit(const DeclContext *Val) { 2444 return static_cast<const ToTy*>(Val); 2445 } 2446 2447 static ToTy *doit(DeclContext *Val) { 2448 return static_cast<ToTy*>(Val); 2449 } 2450 }; 2451 2452 } // namespace clang 2453 2454 namespace llvm { 2455 2456 /// isa<T>(DeclContext*) 2457 template <typename To> 2458 struct isa_impl<To, ::clang::DeclContext> { 2459 static bool doit(const ::clang::DeclContext &Val) { 2460 return To::classofKind(Val.getDeclKind()); 2461 } 2462 }; 2463 2464 /// cast<T>(DeclContext*) 2465 template<class ToTy> 2466 struct cast_convert_val<ToTy, 2467 const ::clang::DeclContext,const ::clang::DeclContext> { 2468 static const ToTy &doit(const ::clang::DeclContext &Val) { 2469 return *::clang::cast_convert_decl_context<ToTy>::doit(&Val); 2470 } 2471 }; 2472 2473 template<class ToTy> 2474 struct cast_convert_val<ToTy, ::clang::DeclContext, ::clang::DeclContext> { 2475 static ToTy &doit(::clang::DeclContext &Val) { 2476 return *::clang::cast_convert_decl_context<ToTy>::doit(&Val); 2477 } 2478 }; 2479 2480 template<class ToTy> 2481 struct cast_convert_val<ToTy, 2482 const ::clang::DeclContext*, const ::clang::DeclContext*> { 2483 static const ToTy *doit(const ::clang::DeclContext *Val) { 2484 return ::clang::cast_convert_decl_context<ToTy>::doit(Val); 2485 } 2486 }; 2487 2488 template<class ToTy> 2489 struct cast_convert_val<ToTy, ::clang::DeclContext*, ::clang::DeclContext*> { 2490 static ToTy *doit(::clang::DeclContext *Val) { 2491 return ::clang::cast_convert_decl_context<ToTy>::doit(Val); 2492 } 2493 }; 2494 2495 /// Implement cast_convert_val for Decl -> DeclContext conversions. 2496 template<class FromTy> 2497 struct cast_convert_val< ::clang::DeclContext, FromTy, FromTy> { 2498 static ::clang::DeclContext &doit(const FromTy &Val) { 2499 return *FromTy::castToDeclContext(&Val); 2500 } 2501 }; 2502 2503 template<class FromTy> 2504 struct cast_convert_val< ::clang::DeclContext, FromTy*, FromTy*> { 2505 static ::clang::DeclContext *doit(const FromTy *Val) { 2506 return FromTy::castToDeclContext(Val); 2507 } 2508 }; 2509 2510 template<class FromTy> 2511 struct cast_convert_val< const ::clang::DeclContext, FromTy, FromTy> { 2512 static const ::clang::DeclContext &doit(const FromTy &Val) { 2513 return *FromTy::castToDeclContext(&Val); 2514 } 2515 }; 2516 2517 template<class FromTy> 2518 struct cast_convert_val< const ::clang::DeclContext, FromTy*, FromTy*> { 2519 static const ::clang::DeclContext *doit(const FromTy *Val) { 2520 return FromTy::castToDeclContext(Val); 2521 } 2522 }; 2523 2524 } // namespace llvm 2525 2526 #endif // LLVM_CLANG_AST_DECLBASE_H 2527