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/Specifiers.h" 20 #include "clang/Basic/VersionTuple.h" 21 #include "llvm/ADT/PointerUnion.h" 22 #include "llvm/ADT/iterator.h" 23 #include "llvm/ADT/iterator_range.h" 24 #include "llvm/Support/Compiler.h" 25 #include "llvm/Support/PrettyStackTrace.h" 26 27 namespace clang { 28 class ASTMutationListener; 29 class BlockDecl; 30 class CXXRecordDecl; 31 class CompoundStmt; 32 class DeclContext; 33 class DeclarationName; 34 class DependentDiagnostic; 35 class EnumDecl; 36 class ExportDecl; 37 class FunctionDecl; 38 class FunctionType; 39 enum Linkage : unsigned char; 40 class LinkageComputer; 41 class LinkageSpecDecl; 42 class Module; 43 class NamedDecl; 44 class NamespaceDecl; 45 class ObjCCategoryDecl; 46 class ObjCCategoryImplDecl; 47 class ObjCContainerDecl; 48 class ObjCImplDecl; 49 class ObjCImplementationDecl; 50 class ObjCInterfaceDecl; 51 class ObjCMethodDecl; 52 class ObjCProtocolDecl; 53 struct PrintingPolicy; 54 class RecordDecl; 55 class Stmt; 56 class StoredDeclsMap; 57 class TemplateDecl; 58 class TranslationUnitDecl; 59 class UsingDirectiveDecl; 60 } 61 62 namespace clang { 63 64 /// \brief Captures the result of checking the availability of a 65 /// declaration. 66 enum AvailabilityResult { 67 AR_Available = 0, 68 AR_NotYetIntroduced, 69 AR_Deprecated, 70 AR_Unavailable 71 }; 72 73 /// Decl - This represents one declaration (or definition), e.g. a variable, 74 /// typedef, function, struct, etc. 75 /// 76 /// Note: There are objects tacked on before the *beginning* of Decl 77 /// (and its subclasses) in its Decl::operator new(). Proper alignment 78 /// of all subclasses (not requiring more than the alignment of Decl) is 79 /// asserted in DeclBase.cpp. 80 class LLVM_ALIGNAS(/*alignof(uint64_t)*/ 8) Decl { 81 public: 82 /// \brief Lists the kind of concrete classes of Decl. 83 enum Kind { 84 #define DECL(DERIVED, BASE) DERIVED, 85 #define ABSTRACT_DECL(DECL) 86 #define DECL_RANGE(BASE, START, END) \ 87 first##BASE = START, last##BASE = END, 88 #define LAST_DECL_RANGE(BASE, START, END) \ 89 first##BASE = START, last##BASE = END 90 #include "clang/AST/DeclNodes.inc" 91 }; 92 93 /// \brief A placeholder type used to construct an empty shell of a 94 /// decl-derived type that will be filled in later (e.g., by some 95 /// deserialization method). 96 struct EmptyShell { }; 97 98 /// IdentifierNamespace - The different namespaces in which 99 /// declarations may appear. According to C99 6.2.3, there are 100 /// four namespaces, labels, tags, members and ordinary 101 /// identifiers. C++ describes lookup completely differently: 102 /// certain lookups merely "ignore" certain kinds of declarations, 103 /// usually based on whether the declaration is of a type, etc. 104 /// 105 /// These are meant as bitmasks, so that searches in 106 /// C++ can look into the "tag" namespace during ordinary lookup. 107 /// 108 /// Decl currently provides 15 bits of IDNS bits. 109 enum IdentifierNamespace { 110 /// Labels, declared with 'x:' and referenced with 'goto x'. 111 IDNS_Label = 0x0001, 112 113 /// Tags, declared with 'struct foo;' and referenced with 114 /// 'struct foo'. All tags are also types. This is what 115 /// elaborated-type-specifiers look for in C. 116 /// This also contains names that conflict with tags in the 117 /// same scope but that are otherwise ordinary names (non-type 118 /// template parameters and indirect field declarations). 119 IDNS_Tag = 0x0002, 120 121 /// Types, declared with 'struct foo', typedefs, etc. 122 /// This is what elaborated-type-specifiers look for in C++, 123 /// but note that it's ill-formed to find a non-tag. 124 IDNS_Type = 0x0004, 125 126 /// Members, declared with object declarations within tag 127 /// definitions. In C, these can only be found by "qualified" 128 /// lookup in member expressions. In C++, they're found by 129 /// normal lookup. 130 IDNS_Member = 0x0008, 131 132 /// Namespaces, declared with 'namespace foo {}'. 133 /// Lookup for nested-name-specifiers find these. 134 IDNS_Namespace = 0x0010, 135 136 /// Ordinary names. In C, everything that's not a label, tag, 137 /// member, or function-local extern ends up here. 138 IDNS_Ordinary = 0x0020, 139 140 /// Objective C \@protocol. 141 IDNS_ObjCProtocol = 0x0040, 142 143 /// This declaration is a friend function. A friend function 144 /// declaration is always in this namespace but may also be in 145 /// IDNS_Ordinary if it was previously declared. 146 IDNS_OrdinaryFriend = 0x0080, 147 148 /// This declaration is a friend class. A friend class 149 /// declaration is always in this namespace but may also be in 150 /// IDNS_Tag|IDNS_Type if it was previously declared. 151 IDNS_TagFriend = 0x0100, 152 153 /// This declaration is a using declaration. A using declaration 154 /// *introduces* a number of other declarations into the current 155 /// scope, and those declarations use the IDNS of their targets, 156 /// but the actual using declarations go in this namespace. 157 IDNS_Using = 0x0200, 158 159 /// This declaration is a C++ operator declared in a non-class 160 /// context. All such operators are also in IDNS_Ordinary. 161 /// C++ lexical operator lookup looks for these. 162 IDNS_NonMemberOperator = 0x0400, 163 164 /// This declaration is a function-local extern declaration of a 165 /// variable or function. This may also be IDNS_Ordinary if it 166 /// has been declared outside any function. These act mostly like 167 /// invisible friend declarations, but are also visible to unqualified 168 /// lookup within the scope of the declaring function. 169 IDNS_LocalExtern = 0x0800, 170 171 /// This declaration is an OpenMP user defined reduction construction. 172 IDNS_OMPReduction = 0x1000 173 }; 174 175 /// ObjCDeclQualifier - 'Qualifiers' written next to the return and 176 /// parameter types in method declarations. Other than remembering 177 /// them and mangling them into the method's signature string, these 178 /// are ignored by the compiler; they are consumed by certain 179 /// remote-messaging frameworks. 180 /// 181 /// in, inout, and out are mutually exclusive and apply only to 182 /// method parameters. bycopy and byref are mutually exclusive and 183 /// apply only to method parameters (?). oneway applies only to 184 /// results. All of these expect their corresponding parameter to 185 /// have a particular type. None of this is currently enforced by 186 /// clang. 187 /// 188 /// This should be kept in sync with ObjCDeclSpec::ObjCDeclQualifier. 189 enum ObjCDeclQualifier { 190 OBJC_TQ_None = 0x0, 191 OBJC_TQ_In = 0x1, 192 OBJC_TQ_Inout = 0x2, 193 OBJC_TQ_Out = 0x4, 194 OBJC_TQ_Bycopy = 0x8, 195 OBJC_TQ_Byref = 0x10, 196 OBJC_TQ_Oneway = 0x20, 197 198 /// The nullability qualifier is set when the nullability of the 199 /// result or parameter was expressed via a context-sensitive 200 /// keyword. 201 OBJC_TQ_CSNullability = 0x40 202 }; 203 204 protected: 205 // Enumeration values used in the bits stored in NextInContextAndBits. 206 enum { 207 /// \brief Whether this declaration is a top-level declaration (function, 208 /// global variable, etc.) that is lexically inside an objc container 209 /// definition. 210 TopLevelDeclInObjCContainerFlag = 0x01, 211 212 /// \brief Whether this declaration is private to the module in which it was 213 /// defined. 214 ModulePrivateFlag = 0x02 215 }; 216 217 /// \brief The next declaration within the same lexical 218 /// DeclContext. These pointers form the linked list that is 219 /// traversed via DeclContext's decls_begin()/decls_end(). 220 /// 221 /// The extra two bits are used for the TopLevelDeclInObjCContainer and 222 /// ModulePrivate bits. 223 llvm::PointerIntPair<Decl *, 2, unsigned> NextInContextAndBits; 224 225 private: 226 friend class DeclContext; 227 228 struct MultipleDC { 229 DeclContext *SemanticDC; 230 DeclContext *LexicalDC; 231 }; 232 233 234 /// DeclCtx - Holds either a DeclContext* or a MultipleDC*. 235 /// For declarations that don't contain C++ scope specifiers, it contains 236 /// the DeclContext where the Decl was declared. 237 /// For declarations with C++ scope specifiers, it contains a MultipleDC* 238 /// with the context where it semantically belongs (SemanticDC) and the 239 /// context where it was lexically declared (LexicalDC). 240 /// e.g.: 241 /// 242 /// namespace A { 243 /// void f(); // SemanticDC == LexicalDC == 'namespace A' 244 /// } 245 /// void A::f(); // SemanticDC == namespace 'A' 246 /// // LexicalDC == global namespace 247 llvm::PointerUnion<DeclContext*, MultipleDC*> DeclCtx; 248 249 inline bool isInSemaDC() const { return DeclCtx.is<DeclContext*>(); } 250 inline bool isOutOfSemaDC() const { return DeclCtx.is<MultipleDC*>(); } 251 inline MultipleDC *getMultipleDC() const { 252 return DeclCtx.get<MultipleDC*>(); 253 } 254 inline DeclContext *getSemanticDC() const { 255 return DeclCtx.get<DeclContext*>(); 256 } 257 258 /// Loc - The location of this decl. 259 SourceLocation Loc; 260 261 /// DeclKind - This indicates which class this is. 262 unsigned DeclKind : 7; 263 264 /// InvalidDecl - This indicates a semantic error occurred. 265 unsigned InvalidDecl : 1; 266 267 /// HasAttrs - This indicates whether the decl has attributes or not. 268 unsigned HasAttrs : 1; 269 270 /// Implicit - Whether this declaration was implicitly generated by 271 /// the implementation rather than explicitly written by the user. 272 unsigned Implicit : 1; 273 274 /// \brief Whether this declaration was "used", meaning that a definition is 275 /// required. 276 unsigned Used : 1; 277 278 /// \brief Whether this declaration was "referenced". 279 /// The difference with 'Used' is whether the reference appears in a 280 /// evaluated context or not, e.g. functions used in uninstantiated templates 281 /// are regarded as "referenced" but not "used". 282 unsigned Referenced : 1; 283 284 /// \brief Whether statistic collection is enabled. 285 static bool StatisticsEnabled; 286 287 protected: 288 /// Access - Used by C++ decls for the access specifier. 289 // NOTE: VC++ treats enums as signed, avoid using the AccessSpecifier enum 290 unsigned Access : 2; 291 friend class CXXClassMemberWrapper; 292 293 /// \brief Whether this declaration was loaded from an AST file. 294 unsigned FromASTFile : 1; 295 296 /// \brief Whether this declaration is hidden from normal name lookup, e.g., 297 /// because it is was loaded from an AST file is either module-private or 298 /// because its submodule has not been made visible. 299 unsigned Hidden : 1; 300 301 /// IdentifierNamespace - This specifies what IDNS_* namespace this lives in. 302 unsigned IdentifierNamespace : 13; 303 304 /// \brief If 0, we have not computed the linkage of this declaration. 305 /// Otherwise, it is the linkage + 1. 306 mutable unsigned CacheValidAndLinkage : 3; 307 308 friend class ASTDeclWriter; 309 friend class ASTDeclReader; 310 friend class ASTReader; 311 friend class LinkageComputer; 312 313 template<typename decl_type> friend class Redeclarable; 314 315 /// \brief Allocate memory for a deserialized declaration. 316 /// 317 /// This routine must be used to allocate memory for any declaration that is 318 /// deserialized from a module file. 319 /// 320 /// \param Size The size of the allocated object. 321 /// \param Ctx The context in which we will allocate memory. 322 /// \param ID The global ID of the deserialized declaration. 323 /// \param Extra The amount of extra space to allocate after the object. 324 void *operator new(std::size_t Size, const ASTContext &Ctx, unsigned ID, 325 std::size_t Extra = 0); 326 327 /// \brief Allocate memory for a non-deserialized declaration. 328 void *operator new(std::size_t Size, const ASTContext &Ctx, 329 DeclContext *Parent, std::size_t Extra = 0); 330 331 private: 332 bool AccessDeclContextSanity() const; 333 334 protected: 335 336 Decl(Kind DK, DeclContext *DC, SourceLocation L) 337 : NextInContextAndBits(), DeclCtx(DC), 338 Loc(L), DeclKind(DK), InvalidDecl(0), 339 HasAttrs(false), Implicit(false), Used(false), Referenced(false), 340 Access(AS_none), FromASTFile(0), Hidden(DC && cast<Decl>(DC)->Hidden), 341 IdentifierNamespace(getIdentifierNamespaceForKind(DK)), 342 CacheValidAndLinkage(0) 343 { 344 if (StatisticsEnabled) add(DK); 345 } 346 347 Decl(Kind DK, EmptyShell Empty) 348 : NextInContextAndBits(), DeclKind(DK), InvalidDecl(0), 349 HasAttrs(false), Implicit(false), Used(false), Referenced(false), 350 Access(AS_none), FromASTFile(0), Hidden(0), 351 IdentifierNamespace(getIdentifierNamespaceForKind(DK)), 352 CacheValidAndLinkage(0) 353 { 354 if (StatisticsEnabled) add(DK); 355 } 356 357 virtual ~Decl(); 358 359 /// \brief Update a potentially out-of-date declaration. 360 void updateOutOfDate(IdentifierInfo &II) const; 361 362 Linkage getCachedLinkage() const { 363 return Linkage(CacheValidAndLinkage - 1); 364 } 365 366 void setCachedLinkage(Linkage L) const { 367 CacheValidAndLinkage = L + 1; 368 } 369 370 bool hasCachedLinkage() const { 371 return CacheValidAndLinkage; 372 } 373 374 public: 375 376 /// \brief Source range that this declaration covers. 377 virtual SourceRange getSourceRange() const LLVM_READONLY { 378 return SourceRange(getLocation(), getLocation()); 379 } 380 SourceLocation getLocStart() const LLVM_READONLY { 381 return getSourceRange().getBegin(); 382 } 383 SourceLocation getLocEnd() const LLVM_READONLY { 384 return getSourceRange().getEnd(); 385 } 386 387 SourceLocation getLocation() const { return Loc; } 388 void setLocation(SourceLocation L) { Loc = L; } 389 390 Kind getKind() const { return static_cast<Kind>(DeclKind); } 391 const char *getDeclKindName() const; 392 393 Decl *getNextDeclInContext() { return NextInContextAndBits.getPointer(); } 394 const Decl *getNextDeclInContext() const {return NextInContextAndBits.getPointer();} 395 396 DeclContext *getDeclContext() { 397 if (isInSemaDC()) 398 return getSemanticDC(); 399 return getMultipleDC()->SemanticDC; 400 } 401 const DeclContext *getDeclContext() const { 402 return const_cast<Decl*>(this)->getDeclContext(); 403 } 404 405 /// Find the innermost non-closure ancestor of this declaration, 406 /// walking up through blocks, lambdas, etc. If that ancestor is 407 /// not a code context (!isFunctionOrMethod()), returns null. 408 /// 409 /// A declaration may be its own non-closure context. 410 Decl *getNonClosureContext(); 411 const Decl *getNonClosureContext() const { 412 return const_cast<Decl*>(this)->getNonClosureContext(); 413 } 414 415 TranslationUnitDecl *getTranslationUnitDecl(); 416 const TranslationUnitDecl *getTranslationUnitDecl() const { 417 return const_cast<Decl*>(this)->getTranslationUnitDecl(); 418 } 419 420 bool isInAnonymousNamespace() const; 421 422 bool isInStdNamespace() const; 423 424 ASTContext &getASTContext() const LLVM_READONLY; 425 426 void setAccess(AccessSpecifier AS) { 427 Access = AS; 428 assert(AccessDeclContextSanity()); 429 } 430 431 AccessSpecifier getAccess() const { 432 assert(AccessDeclContextSanity()); 433 return AccessSpecifier(Access); 434 } 435 436 /// \brief Retrieve the access specifier for this declaration, even though 437 /// it may not yet have been properly set. 438 AccessSpecifier getAccessUnsafe() const { 439 return AccessSpecifier(Access); 440 } 441 442 bool hasAttrs() const { return HasAttrs; } 443 void setAttrs(const AttrVec& Attrs) { 444 return setAttrsImpl(Attrs, getASTContext()); 445 } 446 AttrVec &getAttrs() { 447 return const_cast<AttrVec&>(const_cast<const Decl*>(this)->getAttrs()); 448 } 449 const AttrVec &getAttrs() const; 450 void dropAttrs(); 451 452 void addAttr(Attr *A) { 453 if (hasAttrs()) 454 getAttrs().push_back(A); 455 else 456 setAttrs(AttrVec(1, A)); 457 } 458 459 typedef AttrVec::const_iterator attr_iterator; 460 typedef llvm::iterator_range<attr_iterator> attr_range; 461 462 attr_range attrs() const { 463 return attr_range(attr_begin(), attr_end()); 464 } 465 466 attr_iterator attr_begin() const { 467 return hasAttrs() ? getAttrs().begin() : nullptr; 468 } 469 attr_iterator attr_end() const { 470 return hasAttrs() ? getAttrs().end() : nullptr; 471 } 472 473 template <typename T> 474 void dropAttr() { 475 if (!HasAttrs) return; 476 477 AttrVec &Vec = getAttrs(); 478 Vec.erase(std::remove_if(Vec.begin(), Vec.end(), isa<T, Attr*>), Vec.end()); 479 480 if (Vec.empty()) 481 HasAttrs = false; 482 } 483 484 template <typename T> 485 llvm::iterator_range<specific_attr_iterator<T>> specific_attrs() const { 486 return llvm::make_range(specific_attr_begin<T>(), specific_attr_end<T>()); 487 } 488 489 template <typename T> 490 specific_attr_iterator<T> specific_attr_begin() const { 491 return specific_attr_iterator<T>(attr_begin()); 492 } 493 template <typename T> 494 specific_attr_iterator<T> specific_attr_end() const { 495 return specific_attr_iterator<T>(attr_end()); 496 } 497 498 template<typename T> T *getAttr() const { 499 return hasAttrs() ? getSpecificAttr<T>(getAttrs()) : nullptr; 500 } 501 template<typename T> bool hasAttr() const { 502 return hasAttrs() && hasSpecificAttr<T>(getAttrs()); 503 } 504 505 /// getMaxAlignment - return the maximum alignment specified by attributes 506 /// on this decl, 0 if there are none. 507 unsigned getMaxAlignment() const; 508 509 /// setInvalidDecl - Indicates the Decl had a semantic error. This 510 /// allows for graceful error recovery. 511 void setInvalidDecl(bool Invalid = true); 512 bool isInvalidDecl() const { return (bool) InvalidDecl; } 513 514 /// isImplicit - Indicates whether the declaration was implicitly 515 /// generated by the implementation. If false, this declaration 516 /// was written explicitly in the source code. 517 bool isImplicit() const { return Implicit; } 518 void setImplicit(bool I = true) { Implicit = I; } 519 520 /// \brief Whether *any* (re-)declaration of the entity was used, meaning that 521 /// a definition is required. 522 /// 523 /// \param CheckUsedAttr When true, also consider the "used" attribute 524 /// (in addition to the "used" bit set by \c setUsed()) when determining 525 /// whether the function is used. 526 bool isUsed(bool CheckUsedAttr = true) const; 527 528 /// \brief Set whether the declaration is used, in the sense of odr-use. 529 /// 530 /// This should only be used immediately after creating a declaration. 531 /// It intentionally doesn't notify any listeners. 532 void setIsUsed() { getCanonicalDecl()->Used = true; } 533 534 /// \brief Mark the declaration used, in the sense of odr-use. 535 /// 536 /// This notifies any mutation listeners in addition to setting a bit 537 /// indicating the declaration is used. 538 void markUsed(ASTContext &C); 539 540 /// \brief Whether any declaration of this entity was referenced. 541 bool isReferenced() const; 542 543 /// \brief Whether this declaration was referenced. This should not be relied 544 /// upon for anything other than debugging. 545 bool isThisDeclarationReferenced() const { return Referenced; } 546 547 void setReferenced(bool R = true) { Referenced = R; } 548 549 /// \brief Whether this declaration is a top-level declaration (function, 550 /// global variable, etc.) that is lexically inside an objc container 551 /// definition. 552 bool isTopLevelDeclInObjCContainer() const { 553 return NextInContextAndBits.getInt() & TopLevelDeclInObjCContainerFlag; 554 } 555 556 void setTopLevelDeclInObjCContainer(bool V = true) { 557 unsigned Bits = NextInContextAndBits.getInt(); 558 if (V) 559 Bits |= TopLevelDeclInObjCContainerFlag; 560 else 561 Bits &= ~TopLevelDeclInObjCContainerFlag; 562 NextInContextAndBits.setInt(Bits); 563 } 564 565 /// \brief Whether this declaration was marked as being private to the 566 /// module in which it was defined. 567 bool isModulePrivate() const { 568 return NextInContextAndBits.getInt() & ModulePrivateFlag; 569 } 570 571 /// \brief Whether this declaration is exported (by virtue of being lexically 572 /// within an ExportDecl or by being a NamespaceDecl). 573 bool isExported() const; 574 575 /// Return true if this declaration has an attribute which acts as 576 /// definition of the entity, such as 'alias' or 'ifunc'. 577 bool hasDefiningAttr() const; 578 579 /// Return this declaration's defining attribute if it has one. 580 const Attr *getDefiningAttr() const; 581 582 protected: 583 /// \brief Specify whether this declaration was marked as being private 584 /// to the module in which it was defined. 585 void setModulePrivate(bool MP = true) { 586 unsigned Bits = NextInContextAndBits.getInt(); 587 if (MP) 588 Bits |= ModulePrivateFlag; 589 else 590 Bits &= ~ModulePrivateFlag; 591 NextInContextAndBits.setInt(Bits); 592 } 593 594 /// \brief Set the owning module ID. 595 void setOwningModuleID(unsigned ID) { 596 assert(isFromASTFile() && "Only works on a deserialized declaration"); 597 *((unsigned*)this - 2) = ID; 598 } 599 600 public: 601 602 /// \brief Determine the availability of the given declaration. 603 /// 604 /// This routine will determine the most restrictive availability of 605 /// the given declaration (e.g., preferring 'unavailable' to 606 /// 'deprecated'). 607 /// 608 /// \param Message If non-NULL and the result is not \c 609 /// AR_Available, will be set to a (possibly empty) message 610 /// describing why the declaration has not been introduced, is 611 /// deprecated, or is unavailable. 612 /// 613 /// \param EnclosingVersion The version to compare with. If empty, assume the 614 /// deployment target version. 615 AvailabilityResult 616 getAvailability(std::string *Message = nullptr, 617 VersionTuple EnclosingVersion = VersionTuple()) const; 618 619 /// \brief Determine whether this declaration is marked 'deprecated'. 620 /// 621 /// \param Message If non-NULL and the declaration is deprecated, 622 /// this will be set to the message describing why the declaration 623 /// was deprecated (which may be empty). 624 bool isDeprecated(std::string *Message = nullptr) const { 625 return getAvailability(Message) == AR_Deprecated; 626 } 627 628 /// \brief Determine whether this declaration is marked 'unavailable'. 629 /// 630 /// \param Message If non-NULL and the declaration is unavailable, 631 /// this will be set to the message describing why the declaration 632 /// was made unavailable (which may be empty). 633 bool isUnavailable(std::string *Message = nullptr) const { 634 return getAvailability(Message) == AR_Unavailable; 635 } 636 637 /// \brief Determine whether this is a weak-imported symbol. 638 /// 639 /// Weak-imported symbols are typically marked with the 640 /// 'weak_import' attribute, but may also be marked with an 641 /// 'availability' attribute where we're targing a platform prior to 642 /// the introduction of this feature. 643 bool isWeakImported() const; 644 645 /// \brief Determines whether this symbol can be weak-imported, 646 /// e.g., whether it would be well-formed to add the weak_import 647 /// attribute. 648 /// 649 /// \param IsDefinition Set to \c true to indicate that this 650 /// declaration cannot be weak-imported because it has a definition. 651 bool canBeWeakImported(bool &IsDefinition) const; 652 653 /// \brief Determine whether this declaration came from an AST file (such as 654 /// a precompiled header or module) rather than having been parsed. 655 bool isFromASTFile() const { return FromASTFile; } 656 657 /// \brief Retrieve the global declaration ID associated with this 658 /// declaration, which specifies where this Decl was loaded from. 659 unsigned getGlobalID() const { 660 if (isFromASTFile()) 661 return *((const unsigned*)this - 1); 662 return 0; 663 } 664 665 /// \brief Retrieve the global ID of the module that owns this particular 666 /// declaration. 667 unsigned getOwningModuleID() const { 668 if (isFromASTFile()) 669 return *((const unsigned*)this - 2); 670 return 0; 671 } 672 673 private: 674 Module *getOwningModuleSlow() const; 675 protected: 676 bool hasLocalOwningModuleStorage() const; 677 678 public: 679 /// \brief Get the imported owning module, if this decl is from an imported 680 /// (non-local) module. 681 Module *getImportedOwningModule() const { 682 if (!isFromASTFile()) 683 return nullptr; 684 685 return getOwningModuleSlow(); 686 } 687 688 /// \brief Get the local owning module, if known. Returns nullptr if owner is 689 /// not yet known or declaration is not from a module. 690 Module *getLocalOwningModule() const { 691 if (isFromASTFile() || !Hidden) 692 return nullptr; 693 return reinterpret_cast<Module *const *>(this)[-1]; 694 } 695 void setLocalOwningModule(Module *M) { 696 assert(!isFromASTFile() && Hidden && hasLocalOwningModuleStorage() && 697 "should not have a cached owning module"); 698 reinterpret_cast<Module **>(this)[-1] = M; 699 } 700 701 unsigned getIdentifierNamespace() const { 702 return IdentifierNamespace; 703 } 704 bool isInIdentifierNamespace(unsigned NS) const { 705 return getIdentifierNamespace() & NS; 706 } 707 static unsigned getIdentifierNamespaceForKind(Kind DK); 708 709 bool hasTagIdentifierNamespace() const { 710 return isTagIdentifierNamespace(getIdentifierNamespace()); 711 } 712 static bool isTagIdentifierNamespace(unsigned NS) { 713 // TagDecls have Tag and Type set and may also have TagFriend. 714 return (NS & ~IDNS_TagFriend) == (IDNS_Tag | IDNS_Type); 715 } 716 717 /// getLexicalDeclContext - The declaration context where this Decl was 718 /// lexically declared (LexicalDC). May be different from 719 /// getDeclContext() (SemanticDC). 720 /// e.g.: 721 /// 722 /// namespace A { 723 /// void f(); // SemanticDC == LexicalDC == 'namespace A' 724 /// } 725 /// void A::f(); // SemanticDC == namespace 'A' 726 /// // LexicalDC == global namespace 727 DeclContext *getLexicalDeclContext() { 728 if (isInSemaDC()) 729 return getSemanticDC(); 730 return getMultipleDC()->LexicalDC; 731 } 732 const DeclContext *getLexicalDeclContext() const { 733 return const_cast<Decl*>(this)->getLexicalDeclContext(); 734 } 735 736 /// Determine whether this declaration is declared out of line (outside its 737 /// semantic context). 738 virtual bool isOutOfLine() const; 739 740 /// setDeclContext - Set both the semantic and lexical DeclContext 741 /// to DC. 742 void setDeclContext(DeclContext *DC); 743 744 void setLexicalDeclContext(DeclContext *DC); 745 746 /// isDefinedOutsideFunctionOrMethod - This predicate returns true if this 747 /// scoped decl is defined outside the current function or method. This is 748 /// roughly global variables and functions, but also handles enums (which 749 /// could be defined inside or outside a function etc). 750 bool isDefinedOutsideFunctionOrMethod() const { 751 return getParentFunctionOrMethod() == nullptr; 752 } 753 754 /// \brief Returns true if this declaration lexically is inside a function. 755 /// It recognizes non-defining declarations as well as members of local 756 /// classes: 757 /// \code 758 /// void foo() { void bar(); } 759 /// void foo2() { class ABC { void bar(); }; } 760 /// \endcode 761 bool isLexicallyWithinFunctionOrMethod() const; 762 763 /// \brief If this decl is defined inside a function/method/block it returns 764 /// the corresponding DeclContext, otherwise it returns null. 765 const DeclContext *getParentFunctionOrMethod() const; 766 DeclContext *getParentFunctionOrMethod() { 767 return const_cast<DeclContext*>( 768 const_cast<const Decl*>(this)->getParentFunctionOrMethod()); 769 } 770 771 /// \brief Retrieves the "canonical" declaration of the given declaration. 772 virtual Decl *getCanonicalDecl() { return this; } 773 const Decl *getCanonicalDecl() const { 774 return const_cast<Decl*>(this)->getCanonicalDecl(); 775 } 776 777 /// \brief Whether this particular Decl is a canonical one. 778 bool isCanonicalDecl() const { return getCanonicalDecl() == this; } 779 780 protected: 781 /// \brief Returns the next redeclaration or itself if this is the only decl. 782 /// 783 /// Decl subclasses that can be redeclared should override this method so that 784 /// Decl::redecl_iterator can iterate over them. 785 virtual Decl *getNextRedeclarationImpl() { return this; } 786 787 /// \brief Implementation of getPreviousDecl(), to be overridden by any 788 /// subclass that has a redeclaration chain. 789 virtual Decl *getPreviousDeclImpl() { return nullptr; } 790 791 /// \brief Implementation of getMostRecentDecl(), to be overridden by any 792 /// subclass that has a redeclaration chain. 793 virtual Decl *getMostRecentDeclImpl() { return this; } 794 795 public: 796 /// \brief Iterates through all the redeclarations of the same decl. 797 class redecl_iterator { 798 /// Current - The current declaration. 799 Decl *Current; 800 Decl *Starter; 801 802 public: 803 typedef Decl *value_type; 804 typedef const value_type &reference; 805 typedef const value_type *pointer; 806 typedef std::forward_iterator_tag iterator_category; 807 typedef std::ptrdiff_t difference_type; 808 809 redecl_iterator() : Current(nullptr) { } 810 explicit redecl_iterator(Decl *C) : Current(C), Starter(C) { } 811 812 reference operator*() const { return Current; } 813 value_type operator->() const { return Current; } 814 815 redecl_iterator& operator++() { 816 assert(Current && "Advancing while iterator has reached end"); 817 // Get either previous decl or latest decl. 818 Decl *Next = Current->getNextRedeclarationImpl(); 819 assert(Next && "Should return next redeclaration or itself, never null!"); 820 Current = (Next != Starter) ? Next : nullptr; 821 return *this; 822 } 823 824 redecl_iterator operator++(int) { 825 redecl_iterator tmp(*this); 826 ++(*this); 827 return tmp; 828 } 829 830 friend bool operator==(redecl_iterator x, redecl_iterator y) { 831 return x.Current == y.Current; 832 } 833 friend bool operator!=(redecl_iterator x, redecl_iterator y) { 834 return x.Current != y.Current; 835 } 836 }; 837 838 typedef llvm::iterator_range<redecl_iterator> redecl_range; 839 840 /// \brief Returns an iterator range for all the redeclarations of the same 841 /// decl. It will iterate at least once (when this decl is the only one). 842 redecl_range redecls() const { 843 return redecl_range(redecls_begin(), redecls_end()); 844 } 845 846 redecl_iterator redecls_begin() const { 847 return redecl_iterator(const_cast<Decl *>(this)); 848 } 849 redecl_iterator redecls_end() const { return redecl_iterator(); } 850 851 /// \brief Retrieve the previous declaration that declares the same entity 852 /// as this declaration, or NULL if there is no previous declaration. 853 Decl *getPreviousDecl() { return getPreviousDeclImpl(); } 854 855 /// \brief Retrieve the most recent declaration that declares the same entity 856 /// as this declaration, or NULL if there is no previous declaration. 857 const Decl *getPreviousDecl() const { 858 return const_cast<Decl *>(this)->getPreviousDeclImpl(); 859 } 860 861 /// \brief True if this is the first declaration in its redeclaration chain. 862 bool isFirstDecl() const { 863 return getPreviousDecl() == nullptr; 864 } 865 866 /// \brief Retrieve the most recent declaration that declares the same entity 867 /// as this declaration (which may be this declaration). 868 Decl *getMostRecentDecl() { return getMostRecentDeclImpl(); } 869 870 /// \brief Retrieve the most recent declaration that declares the same entity 871 /// as this declaration (which may be this declaration). 872 const Decl *getMostRecentDecl() const { 873 return const_cast<Decl *>(this)->getMostRecentDeclImpl(); 874 } 875 876 /// getBody - If this Decl represents a declaration for a body of code, 877 /// such as a function or method definition, this method returns the 878 /// top-level Stmt* of that body. Otherwise this method returns null. 879 virtual Stmt* getBody() const { return nullptr; } 880 881 /// \brief Returns true if this \c Decl represents a declaration for a body of 882 /// code, such as a function or method definition. 883 /// Note that \c hasBody can also return true if any redeclaration of this 884 /// \c Decl represents a declaration for a body of code. 885 virtual bool hasBody() const { return getBody() != nullptr; } 886 887 /// getBodyRBrace - Gets the right brace of the body, if a body exists. 888 /// This works whether the body is a CompoundStmt or a CXXTryStmt. 889 SourceLocation getBodyRBrace() const; 890 891 // global temp stats (until we have a per-module visitor) 892 static void add(Kind k); 893 static void EnableStatistics(); 894 static void PrintStats(); 895 896 /// isTemplateParameter - Determines whether this declaration is a 897 /// template parameter. 898 bool isTemplateParameter() const; 899 900 /// isTemplateParameter - Determines whether this declaration is a 901 /// template parameter pack. 902 bool isTemplateParameterPack() const; 903 904 /// \brief Whether this declaration is a parameter pack. 905 bool isParameterPack() const; 906 907 /// \brief returns true if this declaration is a template 908 bool isTemplateDecl() const; 909 910 /// \brief Whether this declaration is a function or function template. 911 bool isFunctionOrFunctionTemplate() const { 912 return (DeclKind >= Decl::firstFunction && 913 DeclKind <= Decl::lastFunction) || 914 DeclKind == FunctionTemplate; 915 } 916 917 /// \brief If this is a declaration that describes some template, this 918 /// method returns that template declaration. 919 TemplateDecl *getDescribedTemplate() const; 920 921 /// \brief Returns the function itself, or the templated function if this is a 922 /// function template. 923 FunctionDecl *getAsFunction() LLVM_READONLY; 924 925 const FunctionDecl *getAsFunction() const { 926 return const_cast<Decl *>(this)->getAsFunction(); 927 } 928 929 /// \brief Changes the namespace of this declaration to reflect that it's 930 /// a function-local extern declaration. 931 /// 932 /// These declarations appear in the lexical context of the extern 933 /// declaration, but in the semantic context of the enclosing namespace 934 /// scope. 935 void setLocalExternDecl() { 936 assert((IdentifierNamespace == IDNS_Ordinary || 937 IdentifierNamespace == IDNS_OrdinaryFriend) && 938 "namespace is not ordinary"); 939 940 Decl *Prev = getPreviousDecl(); 941 IdentifierNamespace &= ~IDNS_Ordinary; 942 943 IdentifierNamespace |= IDNS_LocalExtern; 944 if (Prev && Prev->getIdentifierNamespace() & IDNS_Ordinary) 945 IdentifierNamespace |= IDNS_Ordinary; 946 } 947 948 /// \brief Determine whether this is a block-scope declaration with linkage. 949 /// This will either be a local variable declaration declared 'extern', or a 950 /// local function declaration. 951 bool isLocalExternDecl() { 952 return IdentifierNamespace & IDNS_LocalExtern; 953 } 954 955 /// \brief Changes the namespace of this declaration to reflect that it's 956 /// the object of a friend declaration. 957 /// 958 /// These declarations appear in the lexical context of the friending 959 /// class, but in the semantic context of the actual entity. This property 960 /// applies only to a specific decl object; other redeclarations of the 961 /// same entity may not (and probably don't) share this property. 962 void setObjectOfFriendDecl(bool PerformFriendInjection = false) { 963 unsigned OldNS = IdentifierNamespace; 964 assert((OldNS & (IDNS_Tag | IDNS_Ordinary | 965 IDNS_TagFriend | IDNS_OrdinaryFriend | 966 IDNS_LocalExtern)) && 967 "namespace includes neither ordinary nor tag"); 968 assert(!(OldNS & ~(IDNS_Tag | IDNS_Ordinary | IDNS_Type | 969 IDNS_TagFriend | IDNS_OrdinaryFriend | 970 IDNS_LocalExtern)) && 971 "namespace includes other than ordinary or tag"); 972 973 Decl *Prev = getPreviousDecl(); 974 IdentifierNamespace &= ~(IDNS_Ordinary | IDNS_Tag | IDNS_Type); 975 976 if (OldNS & (IDNS_Tag | IDNS_TagFriend)) { 977 IdentifierNamespace |= IDNS_TagFriend; 978 if (PerformFriendInjection || 979 (Prev && Prev->getIdentifierNamespace() & IDNS_Tag)) 980 IdentifierNamespace |= IDNS_Tag | IDNS_Type; 981 } 982 983 if (OldNS & (IDNS_Ordinary | IDNS_OrdinaryFriend | IDNS_LocalExtern)) { 984 IdentifierNamespace |= IDNS_OrdinaryFriend; 985 if (PerformFriendInjection || 986 (Prev && Prev->getIdentifierNamespace() & IDNS_Ordinary)) 987 IdentifierNamespace |= IDNS_Ordinary; 988 } 989 } 990 991 enum FriendObjectKind { 992 FOK_None, ///< Not a friend object. 993 FOK_Declared, ///< A friend of a previously-declared entity. 994 FOK_Undeclared ///< A friend of a previously-undeclared entity. 995 }; 996 997 /// \brief Determines whether this declaration is the object of a 998 /// friend declaration and, if so, what kind. 999 /// 1000 /// There is currently no direct way to find the associated FriendDecl. 1001 FriendObjectKind getFriendObjectKind() const { 1002 unsigned mask = 1003 (IdentifierNamespace & (IDNS_TagFriend | IDNS_OrdinaryFriend)); 1004 if (!mask) return FOK_None; 1005 return (IdentifierNamespace & (IDNS_Tag | IDNS_Ordinary) ? FOK_Declared 1006 : FOK_Undeclared); 1007 } 1008 1009 /// Specifies that this declaration is a C++ overloaded non-member. 1010 void setNonMemberOperator() { 1011 assert(getKind() == Function || getKind() == FunctionTemplate); 1012 assert((IdentifierNamespace & IDNS_Ordinary) && 1013 "visible non-member operators should be in ordinary namespace"); 1014 IdentifierNamespace |= IDNS_NonMemberOperator; 1015 } 1016 1017 static bool classofKind(Kind K) { return true; } 1018 static DeclContext *castToDeclContext(const Decl *); 1019 static Decl *castFromDeclContext(const DeclContext *); 1020 1021 void print(raw_ostream &Out, unsigned Indentation = 0, 1022 bool PrintInstantiation = false) const; 1023 void print(raw_ostream &Out, const PrintingPolicy &Policy, 1024 unsigned Indentation = 0, bool PrintInstantiation = false) const; 1025 static void printGroup(Decl** Begin, unsigned NumDecls, 1026 raw_ostream &Out, const PrintingPolicy &Policy, 1027 unsigned Indentation = 0); 1028 // Debuggers don't usually respect default arguments. 1029 void dump() const; 1030 // Same as dump(), but forces color printing. 1031 void dumpColor() const; 1032 void dump(raw_ostream &Out, bool Deserialize = false) const; 1033 1034 /// \brief Looks through the Decl's underlying type to extract a FunctionType 1035 /// when possible. Will return null if the type underlying the Decl does not 1036 /// have a FunctionType. 1037 const FunctionType *getFunctionType(bool BlocksToo = true) const; 1038 1039 private: 1040 void setAttrsImpl(const AttrVec& Attrs, ASTContext &Ctx); 1041 void setDeclContextsImpl(DeclContext *SemaDC, DeclContext *LexicalDC, 1042 ASTContext &Ctx); 1043 1044 protected: 1045 ASTMutationListener *getASTMutationListener() const; 1046 }; 1047 1048 /// \brief Determine whether two declarations declare the same entity. 1049 inline bool declaresSameEntity(const Decl *D1, const Decl *D2) { 1050 if (!D1 || !D2) 1051 return false; 1052 1053 if (D1 == D2) 1054 return true; 1055 1056 return D1->getCanonicalDecl() == D2->getCanonicalDecl(); 1057 } 1058 1059 /// PrettyStackTraceDecl - If a crash occurs, indicate that it happened when 1060 /// doing something to a specific decl. 1061 class PrettyStackTraceDecl : public llvm::PrettyStackTraceEntry { 1062 const Decl *TheDecl; 1063 SourceLocation Loc; 1064 SourceManager &SM; 1065 const char *Message; 1066 public: 1067 PrettyStackTraceDecl(const Decl *theDecl, SourceLocation L, 1068 SourceManager &sm, const char *Msg) 1069 : TheDecl(theDecl), Loc(L), SM(sm), Message(Msg) {} 1070 1071 void print(raw_ostream &OS) const override; 1072 }; 1073 1074 /// \brief The results of name lookup within a DeclContext. This is either a 1075 /// single result (with no stable storage) or a collection of results (with 1076 /// stable storage provided by the lookup table). 1077 class DeclContextLookupResult { 1078 typedef ArrayRef<NamedDecl *> ResultTy; 1079 ResultTy Result; 1080 // If there is only one lookup result, it would be invalidated by 1081 // reallocations of the name table, so store it separately. 1082 NamedDecl *Single; 1083 1084 static NamedDecl *const SingleElementDummyList; 1085 1086 public: 1087 DeclContextLookupResult() : Result(), Single() {} 1088 DeclContextLookupResult(ArrayRef<NamedDecl *> Result) 1089 : Result(Result), Single() {} 1090 DeclContextLookupResult(NamedDecl *Single) 1091 : Result(SingleElementDummyList), Single(Single) {} 1092 1093 class iterator; 1094 typedef llvm::iterator_adaptor_base<iterator, ResultTy::iterator, 1095 std::random_access_iterator_tag, 1096 NamedDecl *const> IteratorBase; 1097 class iterator : public IteratorBase { 1098 value_type SingleElement; 1099 1100 public: 1101 iterator() : IteratorBase(), SingleElement() {} 1102 explicit iterator(pointer Pos, value_type Single = nullptr) 1103 : IteratorBase(Pos), SingleElement(Single) {} 1104 1105 reference operator*() const { 1106 return SingleElement ? SingleElement : IteratorBase::operator*(); 1107 } 1108 }; 1109 typedef iterator const_iterator; 1110 typedef iterator::pointer pointer; 1111 typedef iterator::reference reference; 1112 1113 iterator begin() const { return iterator(Result.begin(), Single); } 1114 iterator end() const { return iterator(Result.end(), Single); } 1115 1116 bool empty() const { return Result.empty(); } 1117 pointer data() const { return Single ? &Single : Result.data(); } 1118 size_t size() const { return Single ? 1 : Result.size(); } 1119 reference front() const { return Single ? Single : Result.front(); } 1120 reference back() const { return Single ? Single : Result.back(); } 1121 reference operator[](size_t N) const { return Single ? Single : Result[N]; } 1122 1123 // FIXME: Remove this from the interface 1124 DeclContextLookupResult slice(size_t N) const { 1125 DeclContextLookupResult Sliced = Result.slice(N); 1126 Sliced.Single = Single; 1127 return Sliced; 1128 } 1129 }; 1130 1131 /// DeclContext - This is used only as base class of specific decl types that 1132 /// can act as declaration contexts. These decls are (only the top classes 1133 /// that directly derive from DeclContext are mentioned, not their subclasses): 1134 /// 1135 /// TranslationUnitDecl 1136 /// NamespaceDecl 1137 /// FunctionDecl 1138 /// TagDecl 1139 /// ObjCMethodDecl 1140 /// ObjCContainerDecl 1141 /// LinkageSpecDecl 1142 /// ExportDecl 1143 /// BlockDecl 1144 /// OMPDeclareReductionDecl 1145 /// 1146 class DeclContext { 1147 /// DeclKind - This indicates which class this is. 1148 unsigned DeclKind : 8; 1149 1150 /// \brief Whether this declaration context also has some external 1151 /// storage that contains additional declarations that are lexically 1152 /// part of this context. 1153 mutable bool ExternalLexicalStorage : 1; 1154 1155 /// \brief Whether this declaration context also has some external 1156 /// storage that contains additional declarations that are visible 1157 /// in this context. 1158 mutable bool ExternalVisibleStorage : 1; 1159 1160 /// \brief Whether this declaration context has had external visible 1161 /// storage added since the last lookup. In this case, \c LookupPtr's 1162 /// invariant may not hold and needs to be fixed before we perform 1163 /// another lookup. 1164 mutable bool NeedToReconcileExternalVisibleStorage : 1; 1165 1166 /// \brief If \c true, this context may have local lexical declarations 1167 /// that are missing from the lookup table. 1168 mutable bool HasLazyLocalLexicalLookups : 1; 1169 1170 /// \brief If \c true, the external source may have lexical declarations 1171 /// that are missing from the lookup table. 1172 mutable bool HasLazyExternalLexicalLookups : 1; 1173 1174 /// \brief If \c true, lookups should only return identifier from 1175 /// DeclContext scope (for example TranslationUnit). Used in 1176 /// LookupQualifiedName() 1177 mutable bool UseQualifiedLookup : 1; 1178 1179 /// \brief Pointer to the data structure used to lookup declarations 1180 /// within this context (or a DependentStoredDeclsMap if this is a 1181 /// dependent context). We maintain the invariant that, if the map 1182 /// contains an entry for a DeclarationName (and we haven't lazily 1183 /// omitted anything), then it contains all relevant entries for that 1184 /// name (modulo the hasExternalDecls() flag). 1185 mutable StoredDeclsMap *LookupPtr; 1186 1187 protected: 1188 /// FirstDecl - The first declaration stored within this declaration 1189 /// context. 1190 mutable Decl *FirstDecl; 1191 1192 /// LastDecl - The last declaration stored within this declaration 1193 /// context. FIXME: We could probably cache this value somewhere 1194 /// outside of the DeclContext, to reduce the size of DeclContext by 1195 /// another pointer. 1196 mutable Decl *LastDecl; 1197 1198 friend class ExternalASTSource; 1199 friend class ASTDeclReader; 1200 friend class ASTWriter; 1201 1202 /// \brief Build up a chain of declarations. 1203 /// 1204 /// \returns the first/last pair of declarations. 1205 static std::pair<Decl *, Decl *> 1206 BuildDeclChain(ArrayRef<Decl*> Decls, bool FieldsAlreadyLoaded); 1207 1208 DeclContext(Decl::Kind K) 1209 : DeclKind(K), ExternalLexicalStorage(false), 1210 ExternalVisibleStorage(false), 1211 NeedToReconcileExternalVisibleStorage(false), 1212 HasLazyLocalLexicalLookups(false), HasLazyExternalLexicalLookups(false), 1213 UseQualifiedLookup(false), 1214 LookupPtr(nullptr), FirstDecl(nullptr), LastDecl(nullptr) {} 1215 1216 public: 1217 ~DeclContext(); 1218 1219 Decl::Kind getDeclKind() const { 1220 return static_cast<Decl::Kind>(DeclKind); 1221 } 1222 const char *getDeclKindName() const; 1223 1224 /// getParent - Returns the containing DeclContext. 1225 DeclContext *getParent() { 1226 return cast<Decl>(this)->getDeclContext(); 1227 } 1228 const DeclContext *getParent() const { 1229 return const_cast<DeclContext*>(this)->getParent(); 1230 } 1231 1232 /// getLexicalParent - Returns the containing lexical DeclContext. May be 1233 /// different from getParent, e.g.: 1234 /// 1235 /// namespace A { 1236 /// struct S; 1237 /// } 1238 /// struct A::S {}; // getParent() == namespace 'A' 1239 /// // getLexicalParent() == translation unit 1240 /// 1241 DeclContext *getLexicalParent() { 1242 return cast<Decl>(this)->getLexicalDeclContext(); 1243 } 1244 const DeclContext *getLexicalParent() const { 1245 return const_cast<DeclContext*>(this)->getLexicalParent(); 1246 } 1247 1248 DeclContext *getLookupParent(); 1249 1250 const DeclContext *getLookupParent() const { 1251 return const_cast<DeclContext*>(this)->getLookupParent(); 1252 } 1253 1254 ASTContext &getParentASTContext() const { 1255 return cast<Decl>(this)->getASTContext(); 1256 } 1257 1258 bool isClosure() const { 1259 return DeclKind == Decl::Block; 1260 } 1261 1262 bool isObjCContainer() const { 1263 switch (DeclKind) { 1264 case Decl::ObjCCategory: 1265 case Decl::ObjCCategoryImpl: 1266 case Decl::ObjCImplementation: 1267 case Decl::ObjCInterface: 1268 case Decl::ObjCProtocol: 1269 return true; 1270 } 1271 return false; 1272 } 1273 1274 bool isFunctionOrMethod() const { 1275 switch (DeclKind) { 1276 case Decl::Block: 1277 case Decl::Captured: 1278 case Decl::ObjCMethod: 1279 return true; 1280 default: 1281 return DeclKind >= Decl::firstFunction && DeclKind <= Decl::lastFunction; 1282 } 1283 } 1284 1285 /// \brief Test whether the context supports looking up names. 1286 bool isLookupContext() const { 1287 return !isFunctionOrMethod() && DeclKind != Decl::LinkageSpec && 1288 DeclKind != Decl::Export; 1289 } 1290 1291 bool isFileContext() const { 1292 return DeclKind == Decl::TranslationUnit || DeclKind == Decl::Namespace; 1293 } 1294 1295 bool isTranslationUnit() const { 1296 return DeclKind == Decl::TranslationUnit; 1297 } 1298 1299 bool isRecord() const { 1300 return DeclKind >= Decl::firstRecord && DeclKind <= Decl::lastRecord; 1301 } 1302 1303 bool isNamespace() const { 1304 return DeclKind == Decl::Namespace; 1305 } 1306 1307 bool isStdNamespace() const; 1308 1309 bool isInlineNamespace() const; 1310 1311 /// \brief Determines whether this context is dependent on a 1312 /// template parameter. 1313 bool isDependentContext() const; 1314 1315 /// isTransparentContext - Determines whether this context is a 1316 /// "transparent" context, meaning that the members declared in this 1317 /// context are semantically declared in the nearest enclosing 1318 /// non-transparent (opaque) context but are lexically declared in 1319 /// this context. For example, consider the enumerators of an 1320 /// enumeration type: 1321 /// @code 1322 /// enum E { 1323 /// Val1 1324 /// }; 1325 /// @endcode 1326 /// Here, E is a transparent context, so its enumerator (Val1) will 1327 /// appear (semantically) that it is in the same context of E. 1328 /// Examples of transparent contexts include: enumerations (except for 1329 /// C++0x scoped enums), and C++ linkage specifications. 1330 bool isTransparentContext() const; 1331 1332 /// \brief Determines whether this context or some of its ancestors is a 1333 /// linkage specification context that specifies C linkage. 1334 bool isExternCContext() const; 1335 1336 /// \brief Retrieve the nearest enclosing C linkage specification context. 1337 const LinkageSpecDecl *getExternCContext() const; 1338 1339 /// \brief Determines whether this context or some of its ancestors is a 1340 /// linkage specification context that specifies C++ linkage. 1341 bool isExternCXXContext() const; 1342 1343 /// \brief Determine whether this declaration context is equivalent 1344 /// to the declaration context DC. 1345 bool Equals(const DeclContext *DC) const { 1346 return DC && this->getPrimaryContext() == DC->getPrimaryContext(); 1347 } 1348 1349 /// \brief Determine whether this declaration context encloses the 1350 /// declaration context DC. 1351 bool Encloses(const DeclContext *DC) const; 1352 1353 /// \brief Find the nearest non-closure ancestor of this context, 1354 /// i.e. the innermost semantic parent of this context which is not 1355 /// a closure. A context may be its own non-closure ancestor. 1356 Decl *getNonClosureAncestor(); 1357 const Decl *getNonClosureAncestor() const { 1358 return const_cast<DeclContext*>(this)->getNonClosureAncestor(); 1359 } 1360 1361 /// getPrimaryContext - There may be many different 1362 /// declarations of the same entity (including forward declarations 1363 /// of classes, multiple definitions of namespaces, etc.), each with 1364 /// a different set of declarations. This routine returns the 1365 /// "primary" DeclContext structure, which will contain the 1366 /// information needed to perform name lookup into this context. 1367 DeclContext *getPrimaryContext(); 1368 const DeclContext *getPrimaryContext() const { 1369 return const_cast<DeclContext*>(this)->getPrimaryContext(); 1370 } 1371 1372 /// getRedeclContext - Retrieve the context in which an entity conflicts with 1373 /// other entities of the same name, or where it is a redeclaration if the 1374 /// two entities are compatible. This skips through transparent contexts. 1375 DeclContext *getRedeclContext(); 1376 const DeclContext *getRedeclContext() const { 1377 return const_cast<DeclContext *>(this)->getRedeclContext(); 1378 } 1379 1380 /// \brief Retrieve the nearest enclosing namespace context. 1381 DeclContext *getEnclosingNamespaceContext(); 1382 const DeclContext *getEnclosingNamespaceContext() const { 1383 return const_cast<DeclContext *>(this)->getEnclosingNamespaceContext(); 1384 } 1385 1386 /// \brief Retrieve the outermost lexically enclosing record context. 1387 RecordDecl *getOuterLexicalRecordContext(); 1388 const RecordDecl *getOuterLexicalRecordContext() const { 1389 return const_cast<DeclContext *>(this)->getOuterLexicalRecordContext(); 1390 } 1391 1392 /// \brief Test if this context is part of the enclosing namespace set of 1393 /// the context NS, as defined in C++0x [namespace.def]p9. If either context 1394 /// isn't a namespace, this is equivalent to Equals(). 1395 /// 1396 /// The enclosing namespace set of a namespace is the namespace and, if it is 1397 /// inline, its enclosing namespace, recursively. 1398 bool InEnclosingNamespaceSetOf(const DeclContext *NS) const; 1399 1400 /// \brief Collects all of the declaration contexts that are semantically 1401 /// connected to this declaration context. 1402 /// 1403 /// For declaration contexts that have multiple semantically connected but 1404 /// syntactically distinct contexts, such as C++ namespaces, this routine 1405 /// retrieves the complete set of such declaration contexts in source order. 1406 /// For example, given: 1407 /// 1408 /// \code 1409 /// namespace N { 1410 /// int x; 1411 /// } 1412 /// namespace N { 1413 /// int y; 1414 /// } 1415 /// \endcode 1416 /// 1417 /// The \c Contexts parameter will contain both definitions of N. 1418 /// 1419 /// \param Contexts Will be cleared and set to the set of declaration 1420 /// contexts that are semanticaly connected to this declaration context, 1421 /// in source order, including this context (which may be the only result, 1422 /// for non-namespace contexts). 1423 void collectAllContexts(SmallVectorImpl<DeclContext *> &Contexts); 1424 1425 /// decl_iterator - Iterates through the declarations stored 1426 /// within this context. 1427 class decl_iterator { 1428 /// Current - The current declaration. 1429 Decl *Current; 1430 1431 public: 1432 typedef Decl *value_type; 1433 typedef const value_type &reference; 1434 typedef const value_type *pointer; 1435 typedef std::forward_iterator_tag iterator_category; 1436 typedef std::ptrdiff_t difference_type; 1437 1438 decl_iterator() : Current(nullptr) { } 1439 explicit decl_iterator(Decl *C) : Current(C) { } 1440 1441 reference operator*() const { return Current; } 1442 // This doesn't meet the iterator requirements, but it's convenient 1443 value_type operator->() const { return Current; } 1444 1445 decl_iterator& operator++() { 1446 Current = Current->getNextDeclInContext(); 1447 return *this; 1448 } 1449 1450 decl_iterator operator++(int) { 1451 decl_iterator tmp(*this); 1452 ++(*this); 1453 return tmp; 1454 } 1455 1456 friend bool operator==(decl_iterator x, decl_iterator y) { 1457 return x.Current == y.Current; 1458 } 1459 friend bool operator!=(decl_iterator x, decl_iterator y) { 1460 return x.Current != y.Current; 1461 } 1462 }; 1463 1464 typedef llvm::iterator_range<decl_iterator> decl_range; 1465 1466 /// decls_begin/decls_end - Iterate over the declarations stored in 1467 /// this context. 1468 decl_range decls() const { return decl_range(decls_begin(), decls_end()); } 1469 decl_iterator decls_begin() const; 1470 decl_iterator decls_end() const { return decl_iterator(); } 1471 bool decls_empty() const; 1472 1473 /// noload_decls_begin/end - Iterate over the declarations stored in this 1474 /// context that are currently loaded; don't attempt to retrieve anything 1475 /// from an external source. 1476 decl_range noload_decls() const { 1477 return decl_range(noload_decls_begin(), noload_decls_end()); 1478 } 1479 decl_iterator noload_decls_begin() const { return decl_iterator(FirstDecl); } 1480 decl_iterator noload_decls_end() const { return decl_iterator(); } 1481 1482 /// specific_decl_iterator - Iterates over a subrange of 1483 /// declarations stored in a DeclContext, providing only those that 1484 /// are of type SpecificDecl (or a class derived from it). This 1485 /// iterator is used, for example, to provide iteration over just 1486 /// the fields within a RecordDecl (with SpecificDecl = FieldDecl). 1487 template<typename SpecificDecl> 1488 class specific_decl_iterator { 1489 /// Current - The current, underlying declaration iterator, which 1490 /// will either be NULL or will point to a declaration of 1491 /// type SpecificDecl. 1492 DeclContext::decl_iterator Current; 1493 1494 /// SkipToNextDecl - Advances the current position up to the next 1495 /// declaration of type SpecificDecl that also meets the criteria 1496 /// required by Acceptable. 1497 void SkipToNextDecl() { 1498 while (*Current && !isa<SpecificDecl>(*Current)) 1499 ++Current; 1500 } 1501 1502 public: 1503 typedef SpecificDecl *value_type; 1504 // TODO: Add reference and pointer typedefs (with some appropriate proxy 1505 // type) if we ever have a need for them. 1506 typedef void reference; 1507 typedef void pointer; 1508 typedef std::iterator_traits<DeclContext::decl_iterator>::difference_type 1509 difference_type; 1510 typedef std::forward_iterator_tag iterator_category; 1511 1512 specific_decl_iterator() : Current() { } 1513 1514 /// specific_decl_iterator - Construct a new iterator over a 1515 /// subset of the declarations the range [C, 1516 /// end-of-declarations). If A is non-NULL, it is a pointer to a 1517 /// member function of SpecificDecl that should return true for 1518 /// all of the SpecificDecl instances that will be in the subset 1519 /// of iterators. For example, if you want Objective-C instance 1520 /// methods, SpecificDecl will be ObjCMethodDecl and A will be 1521 /// &ObjCMethodDecl::isInstanceMethod. 1522 explicit specific_decl_iterator(DeclContext::decl_iterator C) : Current(C) { 1523 SkipToNextDecl(); 1524 } 1525 1526 value_type operator*() const { return cast<SpecificDecl>(*Current); } 1527 // This doesn't meet the iterator requirements, but it's convenient 1528 value_type operator->() const { return **this; } 1529 1530 specific_decl_iterator& operator++() { 1531 ++Current; 1532 SkipToNextDecl(); 1533 return *this; 1534 } 1535 1536 specific_decl_iterator operator++(int) { 1537 specific_decl_iterator tmp(*this); 1538 ++(*this); 1539 return tmp; 1540 } 1541 1542 friend bool operator==(const specific_decl_iterator& x, 1543 const specific_decl_iterator& y) { 1544 return x.Current == y.Current; 1545 } 1546 1547 friend bool operator!=(const specific_decl_iterator& x, 1548 const specific_decl_iterator& y) { 1549 return x.Current != y.Current; 1550 } 1551 }; 1552 1553 /// \brief Iterates over a filtered subrange of declarations stored 1554 /// in a DeclContext. 1555 /// 1556 /// This iterator visits only those declarations that are of type 1557 /// SpecificDecl (or a class derived from it) and that meet some 1558 /// additional run-time criteria. This iterator is used, for 1559 /// example, to provide access to the instance methods within an 1560 /// Objective-C interface (with SpecificDecl = ObjCMethodDecl and 1561 /// Acceptable = ObjCMethodDecl::isInstanceMethod). 1562 template<typename SpecificDecl, bool (SpecificDecl::*Acceptable)() const> 1563 class filtered_decl_iterator { 1564 /// Current - The current, underlying declaration iterator, which 1565 /// will either be NULL or will point to a declaration of 1566 /// type SpecificDecl. 1567 DeclContext::decl_iterator Current; 1568 1569 /// SkipToNextDecl - Advances the current position up to the next 1570 /// declaration of type SpecificDecl that also meets the criteria 1571 /// required by Acceptable. 1572 void SkipToNextDecl() { 1573 while (*Current && 1574 (!isa<SpecificDecl>(*Current) || 1575 (Acceptable && !(cast<SpecificDecl>(*Current)->*Acceptable)()))) 1576 ++Current; 1577 } 1578 1579 public: 1580 typedef SpecificDecl *value_type; 1581 // TODO: Add reference and pointer typedefs (with some appropriate proxy 1582 // type) if we ever have a need for them. 1583 typedef void reference; 1584 typedef void pointer; 1585 typedef std::iterator_traits<DeclContext::decl_iterator>::difference_type 1586 difference_type; 1587 typedef std::forward_iterator_tag iterator_category; 1588 1589 filtered_decl_iterator() : Current() { } 1590 1591 /// filtered_decl_iterator - Construct a new iterator over a 1592 /// subset of the declarations the range [C, 1593 /// end-of-declarations). If A is non-NULL, it is a pointer to a 1594 /// member function of SpecificDecl that should return true for 1595 /// all of the SpecificDecl instances that will be in the subset 1596 /// of iterators. For example, if you want Objective-C instance 1597 /// methods, SpecificDecl will be ObjCMethodDecl and A will be 1598 /// &ObjCMethodDecl::isInstanceMethod. 1599 explicit filtered_decl_iterator(DeclContext::decl_iterator C) : Current(C) { 1600 SkipToNextDecl(); 1601 } 1602 1603 value_type operator*() const { return cast<SpecificDecl>(*Current); } 1604 value_type operator->() const { return cast<SpecificDecl>(*Current); } 1605 1606 filtered_decl_iterator& operator++() { 1607 ++Current; 1608 SkipToNextDecl(); 1609 return *this; 1610 } 1611 1612 filtered_decl_iterator operator++(int) { 1613 filtered_decl_iterator tmp(*this); 1614 ++(*this); 1615 return tmp; 1616 } 1617 1618 friend bool operator==(const filtered_decl_iterator& x, 1619 const filtered_decl_iterator& y) { 1620 return x.Current == y.Current; 1621 } 1622 1623 friend bool operator!=(const filtered_decl_iterator& x, 1624 const filtered_decl_iterator& y) { 1625 return x.Current != y.Current; 1626 } 1627 }; 1628 1629 /// @brief Add the declaration D into this context. 1630 /// 1631 /// This routine should be invoked when the declaration D has first 1632 /// been declared, to place D into the context where it was 1633 /// (lexically) defined. Every declaration must be added to one 1634 /// (and only one!) context, where it can be visited via 1635 /// [decls_begin(), decls_end()). Once a declaration has been added 1636 /// to its lexical context, the corresponding DeclContext owns the 1637 /// declaration. 1638 /// 1639 /// If D is also a NamedDecl, it will be made visible within its 1640 /// semantic context via makeDeclVisibleInContext. 1641 void addDecl(Decl *D); 1642 1643 /// @brief Add the declaration D into this context, but suppress 1644 /// searches for external declarations with the same name. 1645 /// 1646 /// Although analogous in function to addDecl, this removes an 1647 /// important check. This is only useful if the Decl is being 1648 /// added in response to an external search; in all other cases, 1649 /// addDecl() is the right function to use. 1650 /// See the ASTImporter for use cases. 1651 void addDeclInternal(Decl *D); 1652 1653 /// @brief Add the declaration D to this context without modifying 1654 /// any lookup tables. 1655 /// 1656 /// This is useful for some operations in dependent contexts where 1657 /// the semantic context might not be dependent; this basically 1658 /// only happens with friends. 1659 void addHiddenDecl(Decl *D); 1660 1661 /// @brief Removes a declaration from this context. 1662 void removeDecl(Decl *D); 1663 1664 /// @brief Checks whether a declaration is in this context. 1665 bool containsDecl(Decl *D) const; 1666 1667 typedef DeclContextLookupResult lookup_result; 1668 typedef lookup_result::iterator lookup_iterator; 1669 1670 /// lookup - Find the declarations (if any) with the given Name in 1671 /// this context. Returns a range of iterators that contains all of 1672 /// the declarations with this name, with object, function, member, 1673 /// and enumerator names preceding any tag name. Note that this 1674 /// routine will not look into parent contexts. 1675 lookup_result lookup(DeclarationName Name) const; 1676 1677 /// \brief Find the declarations with the given name that are visible 1678 /// within this context; don't attempt to retrieve anything from an 1679 /// external source. 1680 lookup_result noload_lookup(DeclarationName Name); 1681 1682 /// \brief A simplistic name lookup mechanism that performs name lookup 1683 /// into this declaration context without consulting the external source. 1684 /// 1685 /// This function should almost never be used, because it subverts the 1686 /// usual relationship between a DeclContext and the external source. 1687 /// See the ASTImporter for the (few, but important) use cases. 1688 /// 1689 /// FIXME: This is very inefficient; replace uses of it with uses of 1690 /// noload_lookup. 1691 void localUncachedLookup(DeclarationName Name, 1692 SmallVectorImpl<NamedDecl *> &Results); 1693 1694 /// @brief Makes a declaration visible within this context. 1695 /// 1696 /// This routine makes the declaration D visible to name lookup 1697 /// within this context and, if this is a transparent context, 1698 /// within its parent contexts up to the first enclosing 1699 /// non-transparent context. Making a declaration visible within a 1700 /// context does not transfer ownership of a declaration, and a 1701 /// declaration can be visible in many contexts that aren't its 1702 /// lexical context. 1703 /// 1704 /// If D is a redeclaration of an existing declaration that is 1705 /// visible from this context, as determined by 1706 /// NamedDecl::declarationReplaces, the previous declaration will be 1707 /// replaced with D. 1708 void makeDeclVisibleInContext(NamedDecl *D); 1709 1710 /// all_lookups_iterator - An iterator that provides a view over the results 1711 /// of looking up every possible name. 1712 class all_lookups_iterator; 1713 1714 typedef llvm::iterator_range<all_lookups_iterator> lookups_range; 1715 1716 lookups_range lookups() const; 1717 lookups_range noload_lookups() const; 1718 1719 /// \brief Iterators over all possible lookups within this context. 1720 all_lookups_iterator lookups_begin() const; 1721 all_lookups_iterator lookups_end() const; 1722 1723 /// \brief Iterators over all possible lookups within this context that are 1724 /// currently loaded; don't attempt to retrieve anything from an external 1725 /// source. 1726 all_lookups_iterator noload_lookups_begin() const; 1727 all_lookups_iterator noload_lookups_end() const; 1728 1729 struct udir_iterator; 1730 typedef llvm::iterator_adaptor_base<udir_iterator, lookup_iterator, 1731 std::random_access_iterator_tag, 1732 UsingDirectiveDecl *> udir_iterator_base; 1733 struct udir_iterator : udir_iterator_base { 1734 udir_iterator(lookup_iterator I) : udir_iterator_base(I) {} 1735 UsingDirectiveDecl *operator*() const; 1736 }; 1737 1738 typedef llvm::iterator_range<udir_iterator> udir_range; 1739 1740 udir_range using_directives() const; 1741 1742 // These are all defined in DependentDiagnostic.h. 1743 class ddiag_iterator; 1744 typedef llvm::iterator_range<DeclContext::ddiag_iterator> ddiag_range; 1745 1746 inline ddiag_range ddiags() const; 1747 1748 // Low-level accessors 1749 1750 /// \brief Mark that there are external lexical declarations that we need 1751 /// to include in our lookup table (and that are not available as external 1752 /// visible lookups). These extra lookup results will be found by walking 1753 /// the lexical declarations of this context. This should be used only if 1754 /// setHasExternalLexicalStorage() has been called on any decl context for 1755 /// which this is the primary context. 1756 void setMustBuildLookupTable() { 1757 assert(this == getPrimaryContext() && 1758 "should only be called on primary context"); 1759 HasLazyExternalLexicalLookups = true; 1760 } 1761 1762 /// \brief Retrieve the internal representation of the lookup structure. 1763 /// This may omit some names if we are lazily building the structure. 1764 StoredDeclsMap *getLookupPtr() const { return LookupPtr; } 1765 1766 /// \brief Ensure the lookup structure is fully-built and return it. 1767 StoredDeclsMap *buildLookup(); 1768 1769 /// \brief Whether this DeclContext has external storage containing 1770 /// additional declarations that are lexically in this context. 1771 bool hasExternalLexicalStorage() const { return ExternalLexicalStorage; } 1772 1773 /// \brief State whether this DeclContext has external storage for 1774 /// declarations lexically in this context. 1775 void setHasExternalLexicalStorage(bool ES = true) { 1776 ExternalLexicalStorage = ES; 1777 } 1778 1779 /// \brief Whether this DeclContext has external storage containing 1780 /// additional declarations that are visible in this context. 1781 bool hasExternalVisibleStorage() const { return ExternalVisibleStorage; } 1782 1783 /// \brief State whether this DeclContext has external storage for 1784 /// declarations visible in this context. 1785 void setHasExternalVisibleStorage(bool ES = true) { 1786 ExternalVisibleStorage = ES; 1787 if (ES && LookupPtr) 1788 NeedToReconcileExternalVisibleStorage = true; 1789 } 1790 1791 /// \brief Determine whether the given declaration is stored in the list of 1792 /// declarations lexically within this context. 1793 bool isDeclInLexicalTraversal(const Decl *D) const { 1794 return D && (D->NextInContextAndBits.getPointer() || D == FirstDecl || 1795 D == LastDecl); 1796 } 1797 1798 bool setUseQualifiedLookup(bool use = true) { 1799 bool old_value = UseQualifiedLookup; 1800 UseQualifiedLookup = use; 1801 return old_value; 1802 } 1803 1804 bool shouldUseQualifiedLookup() const { 1805 return UseQualifiedLookup; 1806 } 1807 1808 static bool classof(const Decl *D); 1809 static bool classof(const DeclContext *D) { return true; } 1810 1811 void dumpDeclContext() const; 1812 void dumpLookups() const; 1813 void dumpLookups(llvm::raw_ostream &OS, bool DumpDecls = false, 1814 bool Deserialize = false) const; 1815 1816 private: 1817 void reconcileExternalVisibleStorage() const; 1818 bool LoadLexicalDeclsFromExternalStorage() const; 1819 1820 /// @brief Makes a declaration visible within this context, but 1821 /// suppresses searches for external declarations with the same 1822 /// name. 1823 /// 1824 /// Analogous to makeDeclVisibleInContext, but for the exclusive 1825 /// use of addDeclInternal(). 1826 void makeDeclVisibleInContextInternal(NamedDecl *D); 1827 1828 friend class DependentDiagnostic; 1829 StoredDeclsMap *CreateStoredDeclsMap(ASTContext &C) const; 1830 1831 void buildLookupImpl(DeclContext *DCtx, bool Internal); 1832 void makeDeclVisibleInContextWithFlags(NamedDecl *D, bool Internal, 1833 bool Rediscoverable); 1834 void makeDeclVisibleInContextImpl(NamedDecl *D, bool Internal); 1835 }; 1836 1837 inline bool Decl::isTemplateParameter() const { 1838 return getKind() == TemplateTypeParm || getKind() == NonTypeTemplateParm || 1839 getKind() == TemplateTemplateParm; 1840 } 1841 1842 // Specialization selected when ToTy is not a known subclass of DeclContext. 1843 template <class ToTy, 1844 bool IsKnownSubtype = ::std::is_base_of<DeclContext, ToTy>::value> 1845 struct cast_convert_decl_context { 1846 static const ToTy *doit(const DeclContext *Val) { 1847 return static_cast<const ToTy*>(Decl::castFromDeclContext(Val)); 1848 } 1849 1850 static ToTy *doit(DeclContext *Val) { 1851 return static_cast<ToTy*>(Decl::castFromDeclContext(Val)); 1852 } 1853 }; 1854 1855 // Specialization selected when ToTy is a known subclass of DeclContext. 1856 template <class ToTy> 1857 struct cast_convert_decl_context<ToTy, true> { 1858 static const ToTy *doit(const DeclContext *Val) { 1859 return static_cast<const ToTy*>(Val); 1860 } 1861 1862 static ToTy *doit(DeclContext *Val) { 1863 return static_cast<ToTy*>(Val); 1864 } 1865 }; 1866 1867 1868 } // end clang. 1869 1870 namespace llvm { 1871 1872 /// isa<T>(DeclContext*) 1873 template <typename To> 1874 struct isa_impl<To, ::clang::DeclContext> { 1875 static bool doit(const ::clang::DeclContext &Val) { 1876 return To::classofKind(Val.getDeclKind()); 1877 } 1878 }; 1879 1880 /// cast<T>(DeclContext*) 1881 template<class ToTy> 1882 struct cast_convert_val<ToTy, 1883 const ::clang::DeclContext,const ::clang::DeclContext> { 1884 static const ToTy &doit(const ::clang::DeclContext &Val) { 1885 return *::clang::cast_convert_decl_context<ToTy>::doit(&Val); 1886 } 1887 }; 1888 template<class ToTy> 1889 struct cast_convert_val<ToTy, ::clang::DeclContext, ::clang::DeclContext> { 1890 static ToTy &doit(::clang::DeclContext &Val) { 1891 return *::clang::cast_convert_decl_context<ToTy>::doit(&Val); 1892 } 1893 }; 1894 template<class ToTy> 1895 struct cast_convert_val<ToTy, 1896 const ::clang::DeclContext*, const ::clang::DeclContext*> { 1897 static const ToTy *doit(const ::clang::DeclContext *Val) { 1898 return ::clang::cast_convert_decl_context<ToTy>::doit(Val); 1899 } 1900 }; 1901 template<class ToTy> 1902 struct cast_convert_val<ToTy, ::clang::DeclContext*, ::clang::DeclContext*> { 1903 static ToTy *doit(::clang::DeclContext *Val) { 1904 return ::clang::cast_convert_decl_context<ToTy>::doit(Val); 1905 } 1906 }; 1907 1908 /// Implement cast_convert_val for Decl -> DeclContext conversions. 1909 template<class FromTy> 1910 struct cast_convert_val< ::clang::DeclContext, FromTy, FromTy> { 1911 static ::clang::DeclContext &doit(const FromTy &Val) { 1912 return *FromTy::castToDeclContext(&Val); 1913 } 1914 }; 1915 1916 template<class FromTy> 1917 struct cast_convert_val< ::clang::DeclContext, FromTy*, FromTy*> { 1918 static ::clang::DeclContext *doit(const FromTy *Val) { 1919 return FromTy::castToDeclContext(Val); 1920 } 1921 }; 1922 1923 template<class FromTy> 1924 struct cast_convert_val< const ::clang::DeclContext, FromTy, FromTy> { 1925 static const ::clang::DeclContext &doit(const FromTy &Val) { 1926 return *FromTy::castToDeclContext(&Val); 1927 } 1928 }; 1929 1930 template<class FromTy> 1931 struct cast_convert_val< const ::clang::DeclContext, FromTy*, FromTy*> { 1932 static const ::clang::DeclContext *doit(const FromTy *Val) { 1933 return FromTy::castToDeclContext(Val); 1934 } 1935 }; 1936 1937 } // end namespace llvm 1938 1939 #endif 1940