DeclBase.h revision 6b6b42aed07726178f61954ac6e51f47da00275c
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/Attr.h" 18#include "clang/AST/Type.h" 19#include "clang/Basic/Specifiers.h" 20#include "llvm/Support/PrettyStackTrace.h" 21#include "llvm/ADT/PointerUnion.h" 22 23namespace clang { 24class DeclContext; 25class TranslationUnitDecl; 26class NamespaceDecl; 27class UsingDirectiveDecl; 28class NamedDecl; 29class FunctionDecl; 30class CXXRecordDecl; 31class EnumDecl; 32class ObjCMethodDecl; 33class ObjCContainerDecl; 34class ObjCInterfaceDecl; 35class ObjCCategoryDecl; 36class ObjCProtocolDecl; 37class ObjCImplementationDecl; 38class ObjCCategoryImplDecl; 39class ObjCImplDecl; 40class LinkageSpecDecl; 41class BlockDecl; 42class DeclarationName; 43class CompoundStmt; 44class StoredDeclsMap; 45class DependentDiagnostic; 46class ASTMutationListener; 47} 48 49namespace llvm { 50// DeclContext* is only 4-byte aligned on 32-bit systems. 51template<> 52 class PointerLikeTypeTraits<clang::DeclContext*> { 53 typedef clang::DeclContext* PT; 54public: 55 static inline void *getAsVoidPointer(PT P) { return P; } 56 static inline PT getFromVoidPointer(void *P) { 57 return static_cast<PT>(P); 58 } 59 enum { NumLowBitsAvailable = 2 }; 60}; 61} 62 63namespace clang { 64 65 /// \brief Captures the result of checking the availability of a 66 /// declaration. 67 enum AvailabilityResult { 68 AR_Available = 0, 69 AR_NotYetIntroduced, 70 AR_Deprecated, 71 AR_Unavailable 72 }; 73 74/// Decl - This represents one declaration (or definition), e.g. a variable, 75/// typedef, function, struct, etc. 76/// 77class Decl { 78public: 79 /// \brief Lists the kind of concrete classes of Decl. 80 enum Kind { 81#define DECL(DERIVED, BASE) DERIVED, 82#define ABSTRACT_DECL(DECL) 83#define DECL_RANGE(BASE, START, END) \ 84 first##BASE = START, last##BASE = END, 85#define LAST_DECL_RANGE(BASE, START, END) \ 86 first##BASE = START, last##BASE = END 87#include "clang/AST/DeclNodes.inc" 88 }; 89 90 /// \brief A placeholder type used to construct an empty shell of a 91 /// decl-derived type that will be filled in later (e.g., by some 92 /// deserialization method). 93 struct EmptyShell { }; 94 95 /// IdentifierNamespace - The different namespaces in which 96 /// declarations may appear. According to C99 6.2.3, there are 97 /// four namespaces, labels, tags, members and ordinary 98 /// identifiers. C++ describes lookup completely differently: 99 /// certain lookups merely "ignore" certain kinds of declarations, 100 /// usually based on whether the declaration is of a type, etc. 101 /// 102 /// These are meant as bitmasks, so that searches in 103 /// C++ can look into the "tag" namespace during ordinary lookup. 104 /// 105 /// Decl currently provides 15 bits of IDNS bits. 106 enum IdentifierNamespace { 107 /// Labels, declared with 'x:' and referenced with 'goto x'. 108 IDNS_Label = 0x0001, 109 110 /// Tags, declared with 'struct foo;' and referenced with 111 /// 'struct foo'. All tags are also types. This is what 112 /// elaborated-type-specifiers look for in C. 113 IDNS_Tag = 0x0002, 114 115 /// Types, declared with 'struct foo', typedefs, etc. 116 /// This is what elaborated-type-specifiers look for in C++, 117 /// but note that it's ill-formed to find a non-tag. 118 IDNS_Type = 0x0004, 119 120 /// Members, declared with object declarations within tag 121 /// definitions. In C, these can only be found by "qualified" 122 /// lookup in member expressions. In C++, they're found by 123 /// normal lookup. 124 IDNS_Member = 0x0008, 125 126 /// Namespaces, declared with 'namespace foo {}'. 127 /// Lookup for nested-name-specifiers find these. 128 IDNS_Namespace = 0x0010, 129 130 /// Ordinary names. In C, everything that's not a label, tag, 131 /// or member ends up here. 132 IDNS_Ordinary = 0x0020, 133 134 /// Objective C @protocol. 135 IDNS_ObjCProtocol = 0x0040, 136 137 /// This declaration is a friend function. A friend function 138 /// declaration is always in this namespace but may also be in 139 /// IDNS_Ordinary if it was previously declared. 140 IDNS_OrdinaryFriend = 0x0080, 141 142 /// This declaration is a friend class. A friend class 143 /// declaration is always in this namespace but may also be in 144 /// IDNS_Tag|IDNS_Type if it was previously declared. 145 IDNS_TagFriend = 0x0100, 146 147 /// This declaration is a using declaration. A using declaration 148 /// *introduces* a number of other declarations into the current 149 /// scope, and those declarations use the IDNS of their targets, 150 /// but the actual using declarations go in this namespace. 151 IDNS_Using = 0x0200, 152 153 /// This declaration is a C++ operator declared in a non-class 154 /// context. All such operators are also in IDNS_Ordinary. 155 /// C++ lexical operator lookup looks for these. 156 IDNS_NonMemberOperator = 0x0400 157 }; 158 159 /// ObjCDeclQualifier - Qualifier used on types in method declarations 160 /// for remote messaging. They are meant for the arguments though and 161 /// applied to the Decls (ObjCMethodDecl and ParmVarDecl). 162 enum ObjCDeclQualifier { 163 OBJC_TQ_None = 0x0, 164 OBJC_TQ_In = 0x1, 165 OBJC_TQ_Inout = 0x2, 166 OBJC_TQ_Out = 0x4, 167 OBJC_TQ_Bycopy = 0x8, 168 OBJC_TQ_Byref = 0x10, 169 OBJC_TQ_Oneway = 0x20 170 }; 171 172private: 173 /// NextDeclInContext - The next declaration within the same lexical 174 /// DeclContext. These pointers form the linked list that is 175 /// traversed via DeclContext's decls_begin()/decls_end(). 176 Decl *NextDeclInContext; 177 178 friend class DeclContext; 179 180 struct MultipleDC { 181 DeclContext *SemanticDC; 182 DeclContext *LexicalDC; 183 }; 184 185 186 /// DeclCtx - Holds either a DeclContext* or a MultipleDC*. 187 /// For declarations that don't contain C++ scope specifiers, it contains 188 /// the DeclContext where the Decl was declared. 189 /// For declarations with C++ scope specifiers, it contains a MultipleDC* 190 /// with the context where it semantically belongs (SemanticDC) and the 191 /// context where it was lexically declared (LexicalDC). 192 /// e.g.: 193 /// 194 /// namespace A { 195 /// void f(); // SemanticDC == LexicalDC == 'namespace A' 196 /// } 197 /// void A::f(); // SemanticDC == namespace 'A' 198 /// // LexicalDC == global namespace 199 llvm::PointerUnion<DeclContext*, MultipleDC*> DeclCtx; 200 201 inline bool isInSemaDC() const { return DeclCtx.is<DeclContext*>(); } 202 inline bool isOutOfSemaDC() const { return DeclCtx.is<MultipleDC*>(); } 203 inline MultipleDC *getMultipleDC() const { 204 return DeclCtx.get<MultipleDC*>(); 205 } 206 inline DeclContext *getSemanticDC() const { 207 return DeclCtx.get<DeclContext*>(); 208 } 209 210 /// Loc - The location of this decl. 211 SourceLocation Loc; 212 213 /// DeclKind - This indicates which class this is. 214 unsigned DeclKind : 8; 215 216 /// InvalidDecl - This indicates a semantic error occurred. 217 unsigned InvalidDecl : 1; 218 219 /// HasAttrs - This indicates whether the decl has attributes or not. 220 unsigned HasAttrs : 1; 221 222 /// Implicit - Whether this declaration was implicitly generated by 223 /// the implementation rather than explicitly written by the user. 224 unsigned Implicit : 1; 225 226 /// \brief Whether this declaration was "used", meaning that a definition is 227 /// required. 228 unsigned Used : 1; 229 230 /// \brief Whether this declaration was "referenced". 231 /// The difference with 'Used' is whether the reference appears in a 232 /// evaluated context or not, e.g. functions used in uninstantiated templates 233 /// are regarded as "referenced" but not "used". 234 unsigned Referenced : 1; 235 236protected: 237 /// Access - Used by C++ decls for the access specifier. 238 // NOTE: VC++ treats enums as signed, avoid using the AccessSpecifier enum 239 unsigned Access : 2; 240 friend class CXXClassMemberWrapper; 241 242 /// PCHLevel - the "level" of AST file from which this declaration was built. 243 unsigned PCHLevel : 2; 244 245 /// ChangedAfterLoad - if this declaration has changed since being loaded 246 unsigned ChangedAfterLoad : 1; 247 248 /// IdentifierNamespace - This specifies what IDNS_* namespace this lives in. 249 unsigned IdentifierNamespace : 12; 250 251 /// \brief Whether the \c CachedLinkage field is active. 252 /// 253 /// This field is only valid for NamedDecls subclasses. 254 mutable unsigned HasCachedLinkage : 1; 255 256 /// \brief If \c HasCachedLinkage, the linkage of this declaration. 257 /// 258 /// This field is only valid for NamedDecls subclasses. 259 mutable unsigned CachedLinkage : 2; 260 261 262private: 263 void CheckAccessDeclContext() const; 264 265protected: 266 267 Decl(Kind DK, DeclContext *DC, SourceLocation L) 268 : NextDeclInContext(0), DeclCtx(DC), 269 Loc(L), DeclKind(DK), InvalidDecl(0), 270 HasAttrs(false), Implicit(false), Used(false), Referenced(false), 271 Access(AS_none), PCHLevel(0), ChangedAfterLoad(false), 272 IdentifierNamespace(getIdentifierNamespaceForKind(DK)), 273 HasCachedLinkage(0) 274 { 275 if (Decl::CollectingStats()) add(DK); 276 } 277 278 Decl(Kind DK, EmptyShell Empty) 279 : NextDeclInContext(0), DeclKind(DK), InvalidDecl(0), 280 HasAttrs(false), Implicit(false), Used(false), Referenced(false), 281 Access(AS_none), PCHLevel(0), ChangedAfterLoad(false), 282 IdentifierNamespace(getIdentifierNamespaceForKind(DK)), 283 HasCachedLinkage(0) 284 { 285 if (Decl::CollectingStats()) add(DK); 286 } 287 288 virtual ~Decl(); 289 290public: 291 292 /// \brief Source range that this declaration covers. 293 virtual SourceRange getSourceRange() const { 294 return SourceRange(getLocation(), getLocation()); 295 } 296 SourceLocation getLocStart() const { return getSourceRange().getBegin(); } 297 SourceLocation getLocEnd() const { return getSourceRange().getEnd(); } 298 299 SourceLocation getLocation() const { return Loc; } 300 void setLocation(SourceLocation L) { Loc = L; } 301 302 Kind getKind() const { return static_cast<Kind>(DeclKind); } 303 const char *getDeclKindName() const; 304 305 Decl *getNextDeclInContext() { return NextDeclInContext; } 306 const Decl *getNextDeclInContext() const { return NextDeclInContext; } 307 308 DeclContext *getDeclContext() { 309 if (isInSemaDC()) 310 return getSemanticDC(); 311 return getMultipleDC()->SemanticDC; 312 } 313 const DeclContext *getDeclContext() const { 314 return const_cast<Decl*>(this)->getDeclContext(); 315 } 316 317 /// Finds the innermost non-closure context of this declaration. 318 /// That is, walk out the DeclContext chain, skipping any blocks. 319 DeclContext *getNonClosureContext(); 320 const DeclContext *getNonClosureContext() const { 321 return const_cast<Decl*>(this)->getNonClosureContext(); 322 } 323 324 TranslationUnitDecl *getTranslationUnitDecl(); 325 const TranslationUnitDecl *getTranslationUnitDecl() const { 326 return const_cast<Decl*>(this)->getTranslationUnitDecl(); 327 } 328 329 bool isInAnonymousNamespace() const; 330 331 ASTContext &getASTContext() const; 332 333 void setAccess(AccessSpecifier AS) { 334 Access = AS; 335#ifndef NDEBUG 336 CheckAccessDeclContext(); 337#endif 338 } 339 340 AccessSpecifier getAccess() const { 341#ifndef NDEBUG 342 CheckAccessDeclContext(); 343#endif 344 return AccessSpecifier(Access); 345 } 346 347 bool hasAttrs() const { return HasAttrs; } 348 void setAttrs(const AttrVec& Attrs); 349 AttrVec &getAttrs() { 350 return const_cast<AttrVec&>(const_cast<const Decl*>(this)->getAttrs()); 351 } 352 const AttrVec &getAttrs() const; 353 void swapAttrs(Decl *D); 354 void dropAttrs(); 355 356 void addAttr(Attr *A) { 357 if (hasAttrs()) 358 getAttrs().push_back(A); 359 else 360 setAttrs(AttrVec(1, A)); 361 } 362 363 typedef AttrVec::const_iterator attr_iterator; 364 365 // FIXME: Do not rely on iterators having comparable singular values. 366 // Note that this should error out if they do not. 367 attr_iterator attr_begin() const { 368 return hasAttrs() ? getAttrs().begin() : 0; 369 } 370 attr_iterator attr_end() const { 371 return hasAttrs() ? getAttrs().end() : 0; 372 } 373 374 template <typename T> 375 specific_attr_iterator<T> specific_attr_begin() const { 376 return specific_attr_iterator<T>(attr_begin()); 377 } 378 template <typename T> 379 specific_attr_iterator<T> specific_attr_end() const { 380 return specific_attr_iterator<T>(attr_end()); 381 } 382 383 template<typename T> T *getAttr() const { 384 return hasAttrs() ? getSpecificAttr<T>(getAttrs()) : 0; 385 } 386 template<typename T> bool hasAttr() const { 387 return hasAttrs() && hasSpecificAttr<T>(getAttrs()); 388 } 389 390 /// getMaxAlignment - return the maximum alignment specified by attributes 391 /// on this decl, 0 if there are none. 392 unsigned getMaxAlignment() const { 393 return hasAttrs() ? getMaxAttrAlignment(getAttrs(), getASTContext()) : 0; 394 } 395 396 /// setInvalidDecl - Indicates the Decl had a semantic error. This 397 /// allows for graceful error recovery. 398 void setInvalidDecl(bool Invalid = true); 399 bool isInvalidDecl() const { return (bool) InvalidDecl; } 400 401 /// isImplicit - Indicates whether the declaration was implicitly 402 /// generated by the implementation. If false, this declaration 403 /// was written explicitly in the source code. 404 bool isImplicit() const { return Implicit; } 405 void setImplicit(bool I = true) { Implicit = I; } 406 407 /// \brief Whether this declaration was used, meaning that a definition 408 /// is required. 409 /// 410 /// \param CheckUsedAttr When true, also consider the "used" attribute 411 /// (in addition to the "used" bit set by \c setUsed()) when determining 412 /// whether the function is used. 413 bool isUsed(bool CheckUsedAttr = true) const; 414 415 void setUsed(bool U = true) { Used = U; } 416 417 /// \brief Whether this declaration was referenced. 418 bool isReferenced() const; 419 420 void setReferenced(bool R = true) { Referenced = R; } 421 422 /// \brief Determine the availability of the given declaration. 423 /// 424 /// This routine will determine the most restrictive availability of 425 /// the given declaration (e.g., preferring 'unavailable' to 426 /// 'deprecated'). 427 /// 428 /// \param Message If non-NULL and the result is not \c 429 /// AR_Available, will be set to a (possibly empty) message 430 /// describing why the declaration has not been introduced, is 431 /// deprecated, or is unavailable. 432 AvailabilityResult getAvailability(std::string *Message = 0) const; 433 434 /// \brief Determine whether this declaration is marked 'deprecated'. 435 /// 436 /// \param Message If non-NULL and the declaration is deprecated, 437 /// this will be set to the message describing why the declaration 438 /// was deprecated (which may be empty). 439 bool isDeprecated(std::string *Message = 0) const { 440 return getAvailability(Message) == AR_Deprecated; 441 } 442 443 /// \brief Determine whether this declaration is marked 'unavailable'. 444 /// 445 /// \param Message If non-NULL and the declaration is unavailable, 446 /// this will be set to the message describing why the declaration 447 /// was made unavailable (which may be empty). 448 bool isUnavailable(std::string *Message = 0) const { 449 return getAvailability(Message) == AR_Unavailable; 450 } 451 452 /// \brief Determine whether this is a weak-imported symbol. 453 /// 454 /// Weak-imported symbols are typically marked with the 455 /// 'weak_import' attribute, but may also be marked with an 456 /// 'availability' attribute where we're targing a platform prior to 457 /// the introduction of this feature. 458 bool isWeakImported() const; 459 460 /// \brief Determines whether this symbol can be weak-imported, 461 /// e.g., whether it would be well-formed to add the weak_import 462 /// attribute. 463 /// 464 /// \param IsDefinition Set to \c true to indicate that this 465 /// declaration cannot be weak-imported because it has a definition. 466 bool canBeWeakImported(bool &IsDefinition) const; 467 468 /// \brief Retrieve the level of precompiled header from which this 469 /// declaration was generated. 470 /// 471 /// The PCH level of a declaration describes where the declaration originated 472 /// from. A PCH level of 0 indicates that the declaration was parsed from 473 /// source. A PCH level of 1 indicates that the declaration was loaded from 474 /// a top-level AST file. A PCH level 2 indicates that the declaration was 475 /// loaded from a PCH file the AST file depends on, and so on. 476 unsigned getPCHLevel() const { return PCHLevel; } 477 478 /// \brief The maximum PCH level that any declaration may have. 479 static const unsigned MaxPCHLevel = 3; 480 481 /// \brief Set the PCH level of this declaration. 482 void setPCHLevel(unsigned Level) { 483 assert(Level <= MaxPCHLevel && "PCH level exceeds the maximum"); 484 PCHLevel = Level; 485 } 486 487 /// \brief Query whether this declaration was changed in a significant way 488 /// since being loaded from an AST file. 489 /// 490 /// In an epic violation of layering, what is "significant" is entirely 491 /// up to the serialization system, but implemented in AST and Sema. 492 bool isChangedSinceDeserialization() const { return ChangedAfterLoad; } 493 494 /// \brief Mark this declaration as having changed since deserialization, or 495 /// reset the flag. 496 void setChangedSinceDeserialization(bool Changed) { 497 ChangedAfterLoad = Changed; 498 } 499 500 unsigned getIdentifierNamespace() const { 501 return IdentifierNamespace; 502 } 503 bool isInIdentifierNamespace(unsigned NS) const { 504 return getIdentifierNamespace() & NS; 505 } 506 static unsigned getIdentifierNamespaceForKind(Kind DK); 507 508 bool hasTagIdentifierNamespace() const { 509 return isTagIdentifierNamespace(getIdentifierNamespace()); 510 } 511 static bool isTagIdentifierNamespace(unsigned NS) { 512 // TagDecls have Tag and Type set and may also have TagFriend. 513 return (NS & ~IDNS_TagFriend) == (IDNS_Tag | IDNS_Type); 514 } 515 516 /// getLexicalDeclContext - The declaration context where this Decl was 517 /// lexically declared (LexicalDC). May be different from 518 /// getDeclContext() (SemanticDC). 519 /// e.g.: 520 /// 521 /// namespace A { 522 /// void f(); // SemanticDC == LexicalDC == 'namespace A' 523 /// } 524 /// void A::f(); // SemanticDC == namespace 'A' 525 /// // LexicalDC == global namespace 526 DeclContext *getLexicalDeclContext() { 527 if (isInSemaDC()) 528 return getSemanticDC(); 529 return getMultipleDC()->LexicalDC; 530 } 531 const DeclContext *getLexicalDeclContext() const { 532 return const_cast<Decl*>(this)->getLexicalDeclContext(); 533 } 534 535 virtual bool isOutOfLine() const { 536 return getLexicalDeclContext() != getDeclContext(); 537 } 538 539 /// setDeclContext - Set both the semantic and lexical DeclContext 540 /// to DC. 541 void setDeclContext(DeclContext *DC); 542 543 void setLexicalDeclContext(DeclContext *DC); 544 545 /// isDefinedOutsideFunctionOrMethod - This predicate returns true if this 546 /// scoped decl is defined outside the current function or method. This is 547 /// roughly global variables and functions, but also handles enums (which 548 /// could be defined inside or outside a function etc). 549 bool isDefinedOutsideFunctionOrMethod() const; 550 551 /// \brief Retrieves the "canonical" declaration of the given declaration. 552 virtual Decl *getCanonicalDecl() { return this; } 553 const Decl *getCanonicalDecl() const { 554 return const_cast<Decl*>(this)->getCanonicalDecl(); 555 } 556 557 /// \brief Whether this particular Decl is a canonical one. 558 bool isCanonicalDecl() const { return getCanonicalDecl() == this; } 559 560protected: 561 /// \brief Returns the next redeclaration or itself if this is the only decl. 562 /// 563 /// Decl subclasses that can be redeclared should override this method so that 564 /// Decl::redecl_iterator can iterate over them. 565 virtual Decl *getNextRedeclaration() { return this; } 566 567public: 568 /// \brief Iterates through all the redeclarations of the same decl. 569 class redecl_iterator { 570 /// Current - The current declaration. 571 Decl *Current; 572 Decl *Starter; 573 574 public: 575 typedef Decl* value_type; 576 typedef Decl* reference; 577 typedef Decl* pointer; 578 typedef std::forward_iterator_tag iterator_category; 579 typedef std::ptrdiff_t difference_type; 580 581 redecl_iterator() : Current(0) { } 582 explicit redecl_iterator(Decl *C) : Current(C), Starter(C) { } 583 584 reference operator*() const { return Current; } 585 pointer operator->() const { return Current; } 586 587 redecl_iterator& operator++() { 588 assert(Current && "Advancing while iterator has reached end"); 589 // Get either previous decl or latest decl. 590 Decl *Next = Current->getNextRedeclaration(); 591 assert(Next && "Should return next redeclaration or itself, never null!"); 592 Current = (Next != Starter ? Next : 0); 593 return *this; 594 } 595 596 redecl_iterator operator++(int) { 597 redecl_iterator tmp(*this); 598 ++(*this); 599 return tmp; 600 } 601 602 friend bool operator==(redecl_iterator x, redecl_iterator y) { 603 return x.Current == y.Current; 604 } 605 friend bool operator!=(redecl_iterator x, redecl_iterator y) { 606 return x.Current != y.Current; 607 } 608 }; 609 610 /// \brief Returns iterator for all the redeclarations of the same decl. 611 /// It will iterate at least once (when this decl is the only one). 612 redecl_iterator redecls_begin() const { 613 return redecl_iterator(const_cast<Decl*>(this)); 614 } 615 redecl_iterator redecls_end() const { return redecl_iterator(); } 616 617 /// getBody - If this Decl represents a declaration for a body of code, 618 /// such as a function or method definition, this method returns the 619 /// top-level Stmt* of that body. Otherwise this method returns null. 620 virtual Stmt* getBody() const { return 0; } 621 622 /// \brief Returns true if this Decl represents a declaration for a body of 623 /// code, such as a function or method definition. 624 virtual bool hasBody() const { return getBody() != 0; } 625 626 /// getBodyRBrace - Gets the right brace of the body, if a body exists. 627 /// This works whether the body is a CompoundStmt or a CXXTryStmt. 628 SourceLocation getBodyRBrace() const; 629 630 // global temp stats (until we have a per-module visitor) 631 static void add(Kind k); 632 static bool CollectingStats(bool Enable = false); 633 static void PrintStats(); 634 635 /// isTemplateParameter - Determines whether this declaration is a 636 /// template parameter. 637 bool isTemplateParameter() const; 638 639 /// isTemplateParameter - Determines whether this declaration is a 640 /// template parameter pack. 641 bool isTemplateParameterPack() const; 642 643 /// \brief Whether this declaration is a parameter pack. 644 bool isParameterPack() const; 645 646 /// \brief Whether this declaration is a function or function template. 647 bool isFunctionOrFunctionTemplate() const; 648 649 /// \brief Changes the namespace of this declaration to reflect that it's 650 /// the object of a friend declaration. 651 /// 652 /// These declarations appear in the lexical context of the friending 653 /// class, but in the semantic context of the actual entity. This property 654 /// applies only to a specific decl object; other redeclarations of the 655 /// same entity may not (and probably don't) share this property. 656 void setObjectOfFriendDecl(bool PreviouslyDeclared) { 657 unsigned OldNS = IdentifierNamespace; 658 assert((OldNS & (IDNS_Tag | IDNS_Ordinary | 659 IDNS_TagFriend | IDNS_OrdinaryFriend)) && 660 "namespace includes neither ordinary nor tag"); 661 assert(!(OldNS & ~(IDNS_Tag | IDNS_Ordinary | IDNS_Type | 662 IDNS_TagFriend | IDNS_OrdinaryFriend)) && 663 "namespace includes other than ordinary or tag"); 664 665 IdentifierNamespace = 0; 666 if (OldNS & (IDNS_Tag | IDNS_TagFriend)) { 667 IdentifierNamespace |= IDNS_TagFriend; 668 if (PreviouslyDeclared) IdentifierNamespace |= IDNS_Tag | IDNS_Type; 669 } 670 671 if (OldNS & (IDNS_Ordinary | IDNS_OrdinaryFriend)) { 672 IdentifierNamespace |= IDNS_OrdinaryFriend; 673 if (PreviouslyDeclared) IdentifierNamespace |= IDNS_Ordinary; 674 } 675 } 676 677 enum FriendObjectKind { 678 FOK_None, // not a friend object 679 FOK_Declared, // a friend of a previously-declared entity 680 FOK_Undeclared // a friend of a previously-undeclared entity 681 }; 682 683 /// \brief Determines whether this declaration is the object of a 684 /// friend declaration and, if so, what kind. 685 /// 686 /// There is currently no direct way to find the associated FriendDecl. 687 FriendObjectKind getFriendObjectKind() const { 688 unsigned mask 689 = (IdentifierNamespace & (IDNS_TagFriend | IDNS_OrdinaryFriend)); 690 if (!mask) return FOK_None; 691 return (IdentifierNamespace & (IDNS_Tag | IDNS_Ordinary) ? 692 FOK_Declared : FOK_Undeclared); 693 } 694 695 /// Specifies that this declaration is a C++ overloaded non-member. 696 void setNonMemberOperator() { 697 assert(getKind() == Function || getKind() == FunctionTemplate); 698 assert((IdentifierNamespace & IDNS_Ordinary) && 699 "visible non-member operators should be in ordinary namespace"); 700 IdentifierNamespace |= IDNS_NonMemberOperator; 701 } 702 703 // Implement isa/cast/dyncast/etc. 704 static bool classof(const Decl *) { return true; } 705 static bool classofKind(Kind K) { return true; } 706 static DeclContext *castToDeclContext(const Decl *); 707 static Decl *castFromDeclContext(const DeclContext *); 708 709 void print(llvm::raw_ostream &Out, unsigned Indentation = 0) const; 710 void print(llvm::raw_ostream &Out, const PrintingPolicy &Policy, 711 unsigned Indentation = 0) const; 712 static void printGroup(Decl** Begin, unsigned NumDecls, 713 llvm::raw_ostream &Out, const PrintingPolicy &Policy, 714 unsigned Indentation = 0); 715 void dump() const; 716 void dumpXML() const; 717 void dumpXML(llvm::raw_ostream &OS) const; 718 719private: 720 const Attr *getAttrsImpl() const; 721 722protected: 723 ASTMutationListener *getASTMutationListener() const; 724}; 725 726/// PrettyStackTraceDecl - If a crash occurs, indicate that it happened when 727/// doing something to a specific decl. 728class PrettyStackTraceDecl : public llvm::PrettyStackTraceEntry { 729 const Decl *TheDecl; 730 SourceLocation Loc; 731 SourceManager &SM; 732 const char *Message; 733public: 734 PrettyStackTraceDecl(const Decl *theDecl, SourceLocation L, 735 SourceManager &sm, const char *Msg) 736 : TheDecl(theDecl), Loc(L), SM(sm), Message(Msg) {} 737 738 virtual void print(llvm::raw_ostream &OS) const; 739}; 740 741class DeclContextLookupResult 742 : public std::pair<NamedDecl**,NamedDecl**> { 743public: 744 DeclContextLookupResult(NamedDecl **I, NamedDecl **E) 745 : std::pair<NamedDecl**,NamedDecl**>(I, E) {} 746 DeclContextLookupResult() 747 : std::pair<NamedDecl**,NamedDecl**>() {} 748 749 using std::pair<NamedDecl**,NamedDecl**>::operator=; 750}; 751 752class DeclContextLookupConstResult 753 : public std::pair<NamedDecl*const*, NamedDecl*const*> { 754public: 755 DeclContextLookupConstResult(std::pair<NamedDecl**,NamedDecl**> R) 756 : std::pair<NamedDecl*const*, NamedDecl*const*>(R) {} 757 DeclContextLookupConstResult(NamedDecl * const *I, NamedDecl * const *E) 758 : std::pair<NamedDecl*const*, NamedDecl*const*>(I, E) {} 759 DeclContextLookupConstResult() 760 : std::pair<NamedDecl*const*, NamedDecl*const*>() {} 761 762 using std::pair<NamedDecl*const*,NamedDecl*const*>::operator=; 763}; 764 765/// DeclContext - This is used only as base class of specific decl types that 766/// can act as declaration contexts. These decls are (only the top classes 767/// that directly derive from DeclContext are mentioned, not their subclasses): 768/// 769/// TranslationUnitDecl 770/// NamespaceDecl 771/// FunctionDecl 772/// TagDecl 773/// ObjCMethodDecl 774/// ObjCContainerDecl 775/// LinkageSpecDecl 776/// BlockDecl 777/// 778class DeclContext { 779 /// DeclKind - This indicates which class this is. 780 unsigned DeclKind : 8; 781 782 /// \brief Whether this declaration context also has some external 783 /// storage that contains additional declarations that are lexically 784 /// part of this context. 785 mutable unsigned ExternalLexicalStorage : 1; 786 787 /// \brief Whether this declaration context also has some external 788 /// storage that contains additional declarations that are visible 789 /// in this context. 790 mutable unsigned ExternalVisibleStorage : 1; 791 792 /// \brief Pointer to the data structure used to lookup declarations 793 /// within this context (or a DependentStoredDeclsMap if this is a 794 /// dependent context). 795 mutable StoredDeclsMap *LookupPtr; 796 797protected: 798 /// FirstDecl - The first declaration stored within this declaration 799 /// context. 800 mutable Decl *FirstDecl; 801 802 /// LastDecl - The last declaration stored within this declaration 803 /// context. FIXME: We could probably cache this value somewhere 804 /// outside of the DeclContext, to reduce the size of DeclContext by 805 /// another pointer. 806 mutable Decl *LastDecl; 807 808 friend class ExternalASTSource; 809 810 /// \brief Build up a chain of declarations. 811 /// 812 /// \returns the first/last pair of declarations. 813 static std::pair<Decl *, Decl *> 814 BuildDeclChain(const llvm::SmallVectorImpl<Decl*> &Decls); 815 816 DeclContext(Decl::Kind K) 817 : DeclKind(K), ExternalLexicalStorage(false), 818 ExternalVisibleStorage(false), LookupPtr(0), FirstDecl(0), 819 LastDecl(0) { } 820 821public: 822 ~DeclContext(); 823 824 Decl::Kind getDeclKind() const { 825 return static_cast<Decl::Kind>(DeclKind); 826 } 827 const char *getDeclKindName() const; 828 829 /// getParent - Returns the containing DeclContext. 830 DeclContext *getParent() { 831 return cast<Decl>(this)->getDeclContext(); 832 } 833 const DeclContext *getParent() const { 834 return const_cast<DeclContext*>(this)->getParent(); 835 } 836 837 /// getLexicalParent - Returns the containing lexical DeclContext. May be 838 /// different from getParent, e.g.: 839 /// 840 /// namespace A { 841 /// struct S; 842 /// } 843 /// struct A::S {}; // getParent() == namespace 'A' 844 /// // getLexicalParent() == translation unit 845 /// 846 DeclContext *getLexicalParent() { 847 return cast<Decl>(this)->getLexicalDeclContext(); 848 } 849 const DeclContext *getLexicalParent() const { 850 return const_cast<DeclContext*>(this)->getLexicalParent(); 851 } 852 853 DeclContext *getLookupParent(); 854 855 const DeclContext *getLookupParent() const { 856 return const_cast<DeclContext*>(this)->getLookupParent(); 857 } 858 859 ASTContext &getParentASTContext() const { 860 return cast<Decl>(this)->getASTContext(); 861 } 862 863 bool isClosure() const { 864 return DeclKind == Decl::Block; 865 } 866 867 bool isFunctionOrMethod() const { 868 switch (DeclKind) { 869 case Decl::Block: 870 case Decl::ObjCMethod: 871 return true; 872 default: 873 return DeclKind >= Decl::firstFunction && DeclKind <= Decl::lastFunction; 874 } 875 } 876 877 bool isFileContext() const { 878 return DeclKind == Decl::TranslationUnit || DeclKind == Decl::Namespace; 879 } 880 881 bool isTranslationUnit() const { 882 return DeclKind == Decl::TranslationUnit; 883 } 884 885 bool isRecord() const { 886 return DeclKind >= Decl::firstRecord && DeclKind <= Decl::lastRecord; 887 } 888 889 bool isNamespace() const { 890 return DeclKind == Decl::Namespace; 891 } 892 893 bool isInlineNamespace() const; 894 895 /// \brief Determines whether this context is dependent on a 896 /// template parameter. 897 bool isDependentContext() const; 898 899 /// isTransparentContext - Determines whether this context is a 900 /// "transparent" context, meaning that the members declared in this 901 /// context are semantically declared in the nearest enclosing 902 /// non-transparent (opaque) context but are lexically declared in 903 /// this context. For example, consider the enumerators of an 904 /// enumeration type: 905 /// @code 906 /// enum E { 907 /// Val1 908 /// }; 909 /// @endcode 910 /// Here, E is a transparent context, so its enumerator (Val1) will 911 /// appear (semantically) that it is in the same context of E. 912 /// Examples of transparent contexts include: enumerations (except for 913 /// C++0x scoped enums), and C++ linkage specifications. 914 bool isTransparentContext() const; 915 916 /// \brief Determines whether this context is, or is nested within, 917 /// a C++ extern "C" linkage spec. 918 bool isExternCContext() const; 919 920 /// \brief Determine whether this declaration context is equivalent 921 /// to the declaration context DC. 922 bool Equals(const DeclContext *DC) const { 923 return DC && this->getPrimaryContext() == DC->getPrimaryContext(); 924 } 925 926 /// \brief Determine whether this declaration context encloses the 927 /// declaration context DC. 928 bool Encloses(const DeclContext *DC) const; 929 930 /// getPrimaryContext - There may be many different 931 /// declarations of the same entity (including forward declarations 932 /// of classes, multiple definitions of namespaces, etc.), each with 933 /// a different set of declarations. This routine returns the 934 /// "primary" DeclContext structure, which will contain the 935 /// information needed to perform name lookup into this context. 936 DeclContext *getPrimaryContext(); 937 const DeclContext *getPrimaryContext() const { 938 return const_cast<DeclContext*>(this)->getPrimaryContext(); 939 } 940 941 /// getRedeclContext - Retrieve the context in which an entity conflicts with 942 /// other entities of the same name, or where it is a redeclaration if the 943 /// two entities are compatible. This skips through transparent contexts. 944 DeclContext *getRedeclContext(); 945 const DeclContext *getRedeclContext() const { 946 return const_cast<DeclContext *>(this)->getRedeclContext(); 947 } 948 949 /// \brief Retrieve the nearest enclosing namespace context. 950 DeclContext *getEnclosingNamespaceContext(); 951 const DeclContext *getEnclosingNamespaceContext() const { 952 return const_cast<DeclContext *>(this)->getEnclosingNamespaceContext(); 953 } 954 955 /// \brief Test if this context is part of the enclosing namespace set of 956 /// the context NS, as defined in C++0x [namespace.def]p9. If either context 957 /// isn't a namespace, this is equivalent to Equals(). 958 /// 959 /// The enclosing namespace set of a namespace is the namespace and, if it is 960 /// inline, its enclosing namespace, recursively. 961 bool InEnclosingNamespaceSetOf(const DeclContext *NS) const; 962 963 /// getNextContext - If this is a DeclContext that may have other 964 /// DeclContexts that are semantically connected but syntactically 965 /// different, such as C++ namespaces, this routine retrieves the 966 /// next DeclContext in the link. Iteration through the chain of 967 /// DeclContexts should begin at the primary DeclContext and 968 /// continue until this function returns NULL. For example, given: 969 /// @code 970 /// namespace N { 971 /// int x; 972 /// } 973 /// namespace N { 974 /// int y; 975 /// } 976 /// @endcode 977 /// The first occurrence of namespace N will be the primary 978 /// DeclContext. Its getNextContext will return the second 979 /// occurrence of namespace N. 980 DeclContext *getNextContext(); 981 982 /// decl_iterator - Iterates through the declarations stored 983 /// within this context. 984 class decl_iterator { 985 /// Current - The current declaration. 986 Decl *Current; 987 988 public: 989 typedef Decl* value_type; 990 typedef Decl* reference; 991 typedef Decl* pointer; 992 typedef std::forward_iterator_tag iterator_category; 993 typedef std::ptrdiff_t difference_type; 994 995 decl_iterator() : Current(0) { } 996 explicit decl_iterator(Decl *C) : Current(C) { } 997 998 reference operator*() const { return Current; } 999 pointer operator->() const { return Current; } 1000 1001 decl_iterator& operator++() { 1002 Current = Current->getNextDeclInContext(); 1003 return *this; 1004 } 1005 1006 decl_iterator operator++(int) { 1007 decl_iterator tmp(*this); 1008 ++(*this); 1009 return tmp; 1010 } 1011 1012 friend bool operator==(decl_iterator x, decl_iterator y) { 1013 return x.Current == y.Current; 1014 } 1015 friend bool operator!=(decl_iterator x, decl_iterator y) { 1016 return x.Current != y.Current; 1017 } 1018 }; 1019 1020 /// decls_begin/decls_end - Iterate over the declarations stored in 1021 /// this context. 1022 decl_iterator decls_begin() const; 1023 decl_iterator decls_end() const; 1024 bool decls_empty() const; 1025 1026 /// noload_decls_begin/end - Iterate over the declarations stored in this 1027 /// context that are currently loaded; don't attempt to retrieve anything 1028 /// from an external source. 1029 decl_iterator noload_decls_begin() const; 1030 decl_iterator noload_decls_end() const; 1031 1032 /// specific_decl_iterator - Iterates over a subrange of 1033 /// declarations stored in a DeclContext, providing only those that 1034 /// are of type SpecificDecl (or a class derived from it). This 1035 /// iterator is used, for example, to provide iteration over just 1036 /// the fields within a RecordDecl (with SpecificDecl = FieldDecl). 1037 template<typename SpecificDecl> 1038 class specific_decl_iterator { 1039 /// Current - The current, underlying declaration iterator, which 1040 /// will either be NULL or will point to a declaration of 1041 /// type SpecificDecl. 1042 DeclContext::decl_iterator Current; 1043 1044 /// SkipToNextDecl - Advances the current position up to the next 1045 /// declaration of type SpecificDecl that also meets the criteria 1046 /// required by Acceptable. 1047 void SkipToNextDecl() { 1048 while (*Current && !isa<SpecificDecl>(*Current)) 1049 ++Current; 1050 } 1051 1052 public: 1053 typedef SpecificDecl* value_type; 1054 typedef SpecificDecl* reference; 1055 typedef SpecificDecl* pointer; 1056 typedef std::iterator_traits<DeclContext::decl_iterator>::difference_type 1057 difference_type; 1058 typedef std::forward_iterator_tag iterator_category; 1059 1060 specific_decl_iterator() : Current() { } 1061 1062 /// specific_decl_iterator - Construct a new iterator over a 1063 /// subset of the declarations the range [C, 1064 /// end-of-declarations). If A is non-NULL, it is a pointer to a 1065 /// member function of SpecificDecl that should return true for 1066 /// all of the SpecificDecl instances that will be in the subset 1067 /// of iterators. For example, if you want Objective-C instance 1068 /// methods, SpecificDecl will be ObjCMethodDecl and A will be 1069 /// &ObjCMethodDecl::isInstanceMethod. 1070 explicit specific_decl_iterator(DeclContext::decl_iterator C) : Current(C) { 1071 SkipToNextDecl(); 1072 } 1073 1074 reference operator*() const { return cast<SpecificDecl>(*Current); } 1075 pointer operator->() const { return cast<SpecificDecl>(*Current); } 1076 1077 specific_decl_iterator& operator++() { 1078 ++Current; 1079 SkipToNextDecl(); 1080 return *this; 1081 } 1082 1083 specific_decl_iterator operator++(int) { 1084 specific_decl_iterator tmp(*this); 1085 ++(*this); 1086 return tmp; 1087 } 1088 1089 friend bool 1090 operator==(const specific_decl_iterator& x, const specific_decl_iterator& y) { 1091 return x.Current == y.Current; 1092 } 1093 1094 friend bool 1095 operator!=(const specific_decl_iterator& x, const specific_decl_iterator& y) { 1096 return x.Current != y.Current; 1097 } 1098 }; 1099 1100 /// \brief Iterates over a filtered subrange of declarations stored 1101 /// in a DeclContext. 1102 /// 1103 /// This iterator visits only those declarations that are of type 1104 /// SpecificDecl (or a class derived from it) and that meet some 1105 /// additional run-time criteria. This iterator is used, for 1106 /// example, to provide access to the instance methods within an 1107 /// Objective-C interface (with SpecificDecl = ObjCMethodDecl and 1108 /// Acceptable = ObjCMethodDecl::isInstanceMethod). 1109 template<typename SpecificDecl, bool (SpecificDecl::*Acceptable)() const> 1110 class filtered_decl_iterator { 1111 /// Current - The current, underlying declaration iterator, which 1112 /// will either be NULL or will point to a declaration of 1113 /// type SpecificDecl. 1114 DeclContext::decl_iterator Current; 1115 1116 /// SkipToNextDecl - Advances the current position up to the next 1117 /// declaration of type SpecificDecl that also meets the criteria 1118 /// required by Acceptable. 1119 void SkipToNextDecl() { 1120 while (*Current && 1121 (!isa<SpecificDecl>(*Current) || 1122 (Acceptable && !(cast<SpecificDecl>(*Current)->*Acceptable)()))) 1123 ++Current; 1124 } 1125 1126 public: 1127 typedef SpecificDecl* value_type; 1128 typedef SpecificDecl* reference; 1129 typedef SpecificDecl* pointer; 1130 typedef std::iterator_traits<DeclContext::decl_iterator>::difference_type 1131 difference_type; 1132 typedef std::forward_iterator_tag iterator_category; 1133 1134 filtered_decl_iterator() : Current() { } 1135 1136 /// specific_decl_iterator - Construct a new iterator over a 1137 /// subset of the declarations the range [C, 1138 /// end-of-declarations). If A is non-NULL, it is a pointer to a 1139 /// member function of SpecificDecl that should return true for 1140 /// all of the SpecificDecl instances that will be in the subset 1141 /// of iterators. For example, if you want Objective-C instance 1142 /// methods, SpecificDecl will be ObjCMethodDecl and A will be 1143 /// &ObjCMethodDecl::isInstanceMethod. 1144 explicit filtered_decl_iterator(DeclContext::decl_iterator C) : Current(C) { 1145 SkipToNextDecl(); 1146 } 1147 1148 reference operator*() const { return cast<SpecificDecl>(*Current); } 1149 pointer operator->() const { return cast<SpecificDecl>(*Current); } 1150 1151 filtered_decl_iterator& operator++() { 1152 ++Current; 1153 SkipToNextDecl(); 1154 return *this; 1155 } 1156 1157 filtered_decl_iterator operator++(int) { 1158 filtered_decl_iterator tmp(*this); 1159 ++(*this); 1160 return tmp; 1161 } 1162 1163 friend bool 1164 operator==(const filtered_decl_iterator& x, const filtered_decl_iterator& y) { 1165 return x.Current == y.Current; 1166 } 1167 1168 friend bool 1169 operator!=(const filtered_decl_iterator& x, const filtered_decl_iterator& y) { 1170 return x.Current != y.Current; 1171 } 1172 }; 1173 1174 /// @brief Add the declaration D into this context. 1175 /// 1176 /// This routine should be invoked when the declaration D has first 1177 /// been declared, to place D into the context where it was 1178 /// (lexically) defined. Every declaration must be added to one 1179 /// (and only one!) context, where it can be visited via 1180 /// [decls_begin(), decls_end()). Once a declaration has been added 1181 /// to its lexical context, the corresponding DeclContext owns the 1182 /// declaration. 1183 /// 1184 /// If D is also a NamedDecl, it will be made visible within its 1185 /// semantic context via makeDeclVisibleInContext. 1186 void addDecl(Decl *D); 1187 1188 /// @brief Add the declaration D to this context without modifying 1189 /// any lookup tables. 1190 /// 1191 /// This is useful for some operations in dependent contexts where 1192 /// the semantic context might not be dependent; this basically 1193 /// only happens with friends. 1194 void addHiddenDecl(Decl *D); 1195 1196 /// @brief Removes a declaration from this context. 1197 void removeDecl(Decl *D); 1198 1199 /// lookup_iterator - An iterator that provides access to the results 1200 /// of looking up a name within this context. 1201 typedef NamedDecl **lookup_iterator; 1202 1203 /// lookup_const_iterator - An iterator that provides non-mutable 1204 /// access to the results of lookup up a name within this context. 1205 typedef NamedDecl * const * lookup_const_iterator; 1206 1207 typedef DeclContextLookupResult lookup_result; 1208 typedef DeclContextLookupConstResult lookup_const_result; 1209 1210 /// lookup - Find the declarations (if any) with the given Name in 1211 /// this context. Returns a range of iterators that contains all of 1212 /// the declarations with this name, with object, function, member, 1213 /// and enumerator names preceding any tag name. Note that this 1214 /// routine will not look into parent contexts. 1215 lookup_result lookup(DeclarationName Name); 1216 lookup_const_result lookup(DeclarationName Name) const; 1217 1218 /// @brief Makes a declaration visible within this context. 1219 /// 1220 /// This routine makes the declaration D visible to name lookup 1221 /// within this context and, if this is a transparent context, 1222 /// within its parent contexts up to the first enclosing 1223 /// non-transparent context. Making a declaration visible within a 1224 /// context does not transfer ownership of a declaration, and a 1225 /// declaration can be visible in many contexts that aren't its 1226 /// lexical context. 1227 /// 1228 /// If D is a redeclaration of an existing declaration that is 1229 /// visible from this context, as determined by 1230 /// NamedDecl::declarationReplaces, the previous declaration will be 1231 /// replaced with D. 1232 /// 1233 /// @param Recoverable true if it's okay to not add this decl to 1234 /// the lookup tables because it can be easily recovered by walking 1235 /// the declaration chains. 1236 void makeDeclVisibleInContext(NamedDecl *D, bool Recoverable = true); 1237 1238 /// \brief Deserialize all the visible declarations from external storage. 1239 /// 1240 /// Name lookup deserializes visible declarations lazily, thus a DeclContext 1241 /// may not have a complete name lookup table. This function deserializes 1242 /// the rest of visible declarations from the external storage and completes 1243 /// the name lookup table. 1244 void MaterializeVisibleDeclsFromExternalStorage(); 1245 1246 /// udir_iterator - Iterates through the using-directives stored 1247 /// within this context. 1248 typedef UsingDirectiveDecl * const * udir_iterator; 1249 1250 typedef std::pair<udir_iterator, udir_iterator> udir_iterator_range; 1251 1252 udir_iterator_range getUsingDirectives() const; 1253 1254 udir_iterator using_directives_begin() const { 1255 return getUsingDirectives().first; 1256 } 1257 1258 udir_iterator using_directives_end() const { 1259 return getUsingDirectives().second; 1260 } 1261 1262 // These are all defined in DependentDiagnostic.h. 1263 class ddiag_iterator; 1264 inline ddiag_iterator ddiag_begin() const; 1265 inline ddiag_iterator ddiag_end() const; 1266 1267 // Low-level accessors 1268 1269 /// \brief Retrieve the internal representation of the lookup structure. 1270 StoredDeclsMap* getLookupPtr() const { return LookupPtr; } 1271 1272 /// \brief Whether this DeclContext has external storage containing 1273 /// additional declarations that are lexically in this context. 1274 bool hasExternalLexicalStorage() const { return ExternalLexicalStorage; } 1275 1276 /// \brief State whether this DeclContext has external storage for 1277 /// declarations lexically in this context. 1278 void setHasExternalLexicalStorage(bool ES = true) { 1279 ExternalLexicalStorage = ES; 1280 } 1281 1282 /// \brief Whether this DeclContext has external storage containing 1283 /// additional declarations that are visible in this context. 1284 bool hasExternalVisibleStorage() const { return ExternalVisibleStorage; } 1285 1286 /// \brief State whether this DeclContext has external storage for 1287 /// declarations visible in this context. 1288 void setHasExternalVisibleStorage(bool ES = true) { 1289 ExternalVisibleStorage = ES; 1290 } 1291 1292 static bool classof(const Decl *D); 1293 static bool classof(const DeclContext *D) { return true; } 1294#define DECL(NAME, BASE) 1295#define DECL_CONTEXT(NAME) \ 1296 static bool classof(const NAME##Decl *D) { return true; } 1297#include "clang/AST/DeclNodes.inc" 1298 1299 void dumpDeclContext() const; 1300 1301private: 1302 void LoadLexicalDeclsFromExternalStorage() const; 1303 1304 friend class DependentDiagnostic; 1305 StoredDeclsMap *CreateStoredDeclsMap(ASTContext &C) const; 1306 1307 void buildLookup(DeclContext *DCtx); 1308 void makeDeclVisibleInContextImpl(NamedDecl *D); 1309}; 1310 1311inline bool Decl::isTemplateParameter() const { 1312 return getKind() == TemplateTypeParm || getKind() == NonTypeTemplateParm || 1313 getKind() == TemplateTemplateParm; 1314} 1315 1316// Specialization selected when ToTy is not a known subclass of DeclContext. 1317template <class ToTy, 1318 bool IsKnownSubtype = ::llvm::is_base_of< DeclContext, ToTy>::value> 1319struct cast_convert_decl_context { 1320 static const ToTy *doit(const DeclContext *Val) { 1321 return static_cast<const ToTy*>(Decl::castFromDeclContext(Val)); 1322 } 1323 1324 static ToTy *doit(DeclContext *Val) { 1325 return static_cast<ToTy*>(Decl::castFromDeclContext(Val)); 1326 } 1327}; 1328 1329// Specialization selected when ToTy is a known subclass of DeclContext. 1330template <class ToTy> 1331struct cast_convert_decl_context<ToTy, true> { 1332 static const ToTy *doit(const DeclContext *Val) { 1333 return static_cast<const ToTy*>(Val); 1334 } 1335 1336 static ToTy *doit(DeclContext *Val) { 1337 return static_cast<ToTy*>(Val); 1338 } 1339}; 1340 1341 1342} // end clang. 1343 1344namespace llvm { 1345 1346/// isa<T>(DeclContext*) 1347template<class ToTy> 1348struct isa_impl_wrap<ToTy, 1349 const ::clang::DeclContext,const ::clang::DeclContext> { 1350 static bool doit(const ::clang::DeclContext &Val) { 1351 return ToTy::classofKind(Val.getDeclKind()); 1352 } 1353}; 1354template<class ToTy> 1355struct isa_impl_wrap<ToTy, ::clang::DeclContext, ::clang::DeclContext> 1356 : public isa_impl_wrap<ToTy, 1357 const ::clang::DeclContext,const ::clang::DeclContext> {}; 1358 1359/// cast<T>(DeclContext*) 1360template<class ToTy> 1361struct cast_convert_val<ToTy, 1362 const ::clang::DeclContext,const ::clang::DeclContext> { 1363 static const ToTy &doit(const ::clang::DeclContext &Val) { 1364 return *::clang::cast_convert_decl_context<ToTy>::doit(&Val); 1365 } 1366}; 1367template<class ToTy> 1368struct cast_convert_val<ToTy, ::clang::DeclContext, ::clang::DeclContext> { 1369 static ToTy &doit(::clang::DeclContext &Val) { 1370 return *::clang::cast_convert_decl_context<ToTy>::doit(&Val); 1371 } 1372}; 1373template<class ToTy> 1374struct cast_convert_val<ToTy, 1375 const ::clang::DeclContext*, const ::clang::DeclContext*> { 1376 static const ToTy *doit(const ::clang::DeclContext *Val) { 1377 return ::clang::cast_convert_decl_context<ToTy>::doit(Val); 1378 } 1379}; 1380template<class ToTy> 1381struct cast_convert_val<ToTy, ::clang::DeclContext*, ::clang::DeclContext*> { 1382 static ToTy *doit(::clang::DeclContext *Val) { 1383 return ::clang::cast_convert_decl_context<ToTy>::doit(Val); 1384 } 1385}; 1386 1387/// Implement cast_convert_val for Decl -> DeclContext conversions. 1388template<class FromTy> 1389struct cast_convert_val< ::clang::DeclContext, FromTy, FromTy> { 1390 static ::clang::DeclContext &doit(const FromTy &Val) { 1391 return *FromTy::castToDeclContext(&Val); 1392 } 1393}; 1394 1395template<class FromTy> 1396struct cast_convert_val< ::clang::DeclContext, FromTy*, FromTy*> { 1397 static ::clang::DeclContext *doit(const FromTy *Val) { 1398 return FromTy::castToDeclContext(Val); 1399 } 1400}; 1401 1402template<class FromTy> 1403struct cast_convert_val< const ::clang::DeclContext, FromTy, FromTy> { 1404 static const ::clang::DeclContext &doit(const FromTy &Val) { 1405 return *FromTy::castToDeclContext(&Val); 1406 } 1407}; 1408 1409template<class FromTy> 1410struct cast_convert_val< const ::clang::DeclContext, FromTy*, FromTy*> { 1411 static const ::clang::DeclContext *doit(const FromTy *Val) { 1412 return FromTy::castToDeclContext(Val); 1413 } 1414}; 1415 1416} // end namespace llvm 1417 1418#endif 1419