DeclBase.h revision 360784
1//===- DeclBase.h - Base Classes for representing declarations --*- C++ -*-===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This file defines the Decl and DeclContext interfaces. 10// 11//===----------------------------------------------------------------------===// 12 13#ifndef LLVM_CLANG_AST_DECLBASE_H 14#define LLVM_CLANG_AST_DECLBASE_H 15 16#include "clang/AST/ASTDumperUtils.h" 17#include "clang/AST/AttrIterator.h" 18#include "clang/AST/DeclarationName.h" 19#include "clang/Basic/IdentifierTable.h" 20#include "clang/Basic/LLVM.h" 21#include "clang/Basic/SourceLocation.h" 22#include "clang/Basic/Specifiers.h" 23#include "llvm/ADT/ArrayRef.h" 24#include "llvm/ADT/PointerIntPair.h" 25#include "llvm/ADT/PointerUnion.h" 26#include "llvm/ADT/iterator.h" 27#include "llvm/ADT/iterator_range.h" 28#include "llvm/Support/Casting.h" 29#include "llvm/Support/Compiler.h" 30#include "llvm/Support/PrettyStackTrace.h" 31#include "llvm/Support/VersionTuple.h" 32#include <algorithm> 33#include <cassert> 34#include <cstddef> 35#include <iterator> 36#include <string> 37#include <type_traits> 38#include <utility> 39 40namespace clang { 41 42class ASTContext; 43class ASTMutationListener; 44class Attr; 45class BlockDecl; 46class DeclContext; 47class ExternalSourceSymbolAttr; 48class FunctionDecl; 49class FunctionType; 50class IdentifierInfo; 51enum Linkage : unsigned char; 52class LinkageSpecDecl; 53class Module; 54class NamedDecl; 55class ObjCCategoryDecl; 56class ObjCCategoryImplDecl; 57class ObjCContainerDecl; 58class ObjCImplDecl; 59class ObjCImplementationDecl; 60class ObjCInterfaceDecl; 61class ObjCMethodDecl; 62class ObjCProtocolDecl; 63struct PrintingPolicy; 64class RecordDecl; 65class SourceManager; 66class Stmt; 67class StoredDeclsMap; 68class TemplateDecl; 69class TranslationUnitDecl; 70class UsingDirectiveDecl; 71 72/// Captures the result of checking the availability of a 73/// declaration. 74enum AvailabilityResult { 75 AR_Available = 0, 76 AR_NotYetIntroduced, 77 AR_Deprecated, 78 AR_Unavailable 79}; 80 81/// Decl - This represents one declaration (or definition), e.g. a variable, 82/// typedef, function, struct, etc. 83/// 84/// Note: There are objects tacked on before the *beginning* of Decl 85/// (and its subclasses) in its Decl::operator new(). Proper alignment 86/// of all subclasses (not requiring more than the alignment of Decl) is 87/// asserted in DeclBase.cpp. 88class alignas(8) Decl { 89public: 90 /// Lists the kind of concrete classes of Decl. 91 enum Kind { 92#define DECL(DERIVED, BASE) DERIVED, 93#define ABSTRACT_DECL(DECL) 94#define DECL_RANGE(BASE, START, END) \ 95 first##BASE = START, last##BASE = END, 96#define LAST_DECL_RANGE(BASE, START, END) \ 97 first##BASE = START, last##BASE = END 98#include "clang/AST/DeclNodes.inc" 99 }; 100 101 /// A placeholder type used to construct an empty shell of a 102 /// decl-derived type that will be filled in later (e.g., by some 103 /// deserialization method). 104 struct EmptyShell {}; 105 106 /// IdentifierNamespace - The different namespaces in which 107 /// declarations may appear. According to C99 6.2.3, there are 108 /// four namespaces, labels, tags, members and ordinary 109 /// identifiers. C++ describes lookup completely differently: 110 /// certain lookups merely "ignore" certain kinds of declarations, 111 /// usually based on whether the declaration is of a type, etc. 112 /// 113 /// These are meant as bitmasks, so that searches in 114 /// C++ can look into the "tag" namespace during ordinary lookup. 115 /// 116 /// Decl currently provides 15 bits of IDNS bits. 117 enum IdentifierNamespace { 118 /// Labels, declared with 'x:' and referenced with 'goto x'. 119 IDNS_Label = 0x0001, 120 121 /// Tags, declared with 'struct foo;' and referenced with 122 /// 'struct foo'. All tags are also types. This is what 123 /// elaborated-type-specifiers look for in C. 124 /// This also contains names that conflict with tags in the 125 /// same scope but that are otherwise ordinary names (non-type 126 /// template parameters and indirect field declarations). 127 IDNS_Tag = 0x0002, 128 129 /// Types, declared with 'struct foo', typedefs, etc. 130 /// This is what elaborated-type-specifiers look for in C++, 131 /// but note that it's ill-formed to find a non-tag. 132 IDNS_Type = 0x0004, 133 134 /// Members, declared with object declarations within tag 135 /// definitions. In C, these can only be found by "qualified" 136 /// lookup in member expressions. In C++, they're found by 137 /// normal lookup. 138 IDNS_Member = 0x0008, 139 140 /// Namespaces, declared with 'namespace foo {}'. 141 /// Lookup for nested-name-specifiers find these. 142 IDNS_Namespace = 0x0010, 143 144 /// Ordinary names. In C, everything that's not a label, tag, 145 /// member, or function-local extern ends up here. 146 IDNS_Ordinary = 0x0020, 147 148 /// Objective C \@protocol. 149 IDNS_ObjCProtocol = 0x0040, 150 151 /// This declaration is a friend function. A friend function 152 /// declaration is always in this namespace but may also be in 153 /// IDNS_Ordinary if it was previously declared. 154 IDNS_OrdinaryFriend = 0x0080, 155 156 /// This declaration is a friend class. A friend class 157 /// declaration is always in this namespace but may also be in 158 /// IDNS_Tag|IDNS_Type if it was previously declared. 159 IDNS_TagFriend = 0x0100, 160 161 /// This declaration is a using declaration. A using declaration 162 /// *introduces* a number of other declarations into the current 163 /// scope, and those declarations use the IDNS of their targets, 164 /// but the actual using declarations go in this namespace. 165 IDNS_Using = 0x0200, 166 167 /// This declaration is a C++ operator declared in a non-class 168 /// context. All such operators are also in IDNS_Ordinary. 169 /// C++ lexical operator lookup looks for these. 170 IDNS_NonMemberOperator = 0x0400, 171 172 /// This declaration is a function-local extern declaration of a 173 /// variable or function. This may also be IDNS_Ordinary if it 174 /// has been declared outside any function. These act mostly like 175 /// invisible friend declarations, but are also visible to unqualified 176 /// lookup within the scope of the declaring function. 177 IDNS_LocalExtern = 0x0800, 178 179 /// This declaration is an OpenMP user defined reduction construction. 180 IDNS_OMPReduction = 0x1000, 181 182 /// This declaration is an OpenMP user defined mapper. 183 IDNS_OMPMapper = 0x2000, 184 }; 185 186 /// ObjCDeclQualifier - 'Qualifiers' written next to the return and 187 /// parameter types in method declarations. Other than remembering 188 /// them and mangling them into the method's signature string, these 189 /// are ignored by the compiler; they are consumed by certain 190 /// remote-messaging frameworks. 191 /// 192 /// in, inout, and out are mutually exclusive and apply only to 193 /// method parameters. bycopy and byref are mutually exclusive and 194 /// apply only to method parameters (?). oneway applies only to 195 /// results. All of these expect their corresponding parameter to 196 /// have a particular type. None of this is currently enforced by 197 /// clang. 198 /// 199 /// This should be kept in sync with ObjCDeclSpec::ObjCDeclQualifier. 200 enum ObjCDeclQualifier { 201 OBJC_TQ_None = 0x0, 202 OBJC_TQ_In = 0x1, 203 OBJC_TQ_Inout = 0x2, 204 OBJC_TQ_Out = 0x4, 205 OBJC_TQ_Bycopy = 0x8, 206 OBJC_TQ_Byref = 0x10, 207 OBJC_TQ_Oneway = 0x20, 208 209 /// The nullability qualifier is set when the nullability of the 210 /// result or parameter was expressed via a context-sensitive 211 /// keyword. 212 OBJC_TQ_CSNullability = 0x40 213 }; 214 215 /// The kind of ownership a declaration has, for visibility purposes. 216 /// This enumeration is designed such that higher values represent higher 217 /// levels of name hiding. 218 enum class ModuleOwnershipKind : unsigned { 219 /// This declaration is not owned by a module. 220 Unowned, 221 222 /// This declaration has an owning module, but is globally visible 223 /// (typically because its owning module is visible and we know that 224 /// modules cannot later become hidden in this compilation). 225 /// After serialization and deserialization, this will be converted 226 /// to VisibleWhenImported. 227 Visible, 228 229 /// This declaration has an owning module, and is visible when that 230 /// module is imported. 231 VisibleWhenImported, 232 233 /// This declaration has an owning module, but is only visible to 234 /// lookups that occur within that module. 235 ModulePrivate 236 }; 237 238protected: 239 /// The next declaration within the same lexical 240 /// DeclContext. These pointers form the linked list that is 241 /// traversed via DeclContext's decls_begin()/decls_end(). 242 /// 243 /// The extra two bits are used for the ModuleOwnershipKind. 244 llvm::PointerIntPair<Decl *, 2, ModuleOwnershipKind> NextInContextAndBits; 245 246private: 247 friend class DeclContext; 248 249 struct MultipleDC { 250 DeclContext *SemanticDC; 251 DeclContext *LexicalDC; 252 }; 253 254 /// DeclCtx - Holds either a DeclContext* or a MultipleDC*. 255 /// For declarations that don't contain C++ scope specifiers, it contains 256 /// the DeclContext where the Decl was declared. 257 /// For declarations with C++ scope specifiers, it contains a MultipleDC* 258 /// with the context where it semantically belongs (SemanticDC) and the 259 /// context where it was lexically declared (LexicalDC). 260 /// e.g.: 261 /// 262 /// namespace A { 263 /// void f(); // SemanticDC == LexicalDC == 'namespace A' 264 /// } 265 /// void A::f(); // SemanticDC == namespace 'A' 266 /// // LexicalDC == global namespace 267 llvm::PointerUnion<DeclContext*, MultipleDC*> DeclCtx; 268 269 bool isInSemaDC() const { return DeclCtx.is<DeclContext*>(); } 270 bool isOutOfSemaDC() const { return DeclCtx.is<MultipleDC*>(); } 271 272 MultipleDC *getMultipleDC() const { 273 return DeclCtx.get<MultipleDC*>(); 274 } 275 276 DeclContext *getSemanticDC() const { 277 return DeclCtx.get<DeclContext*>(); 278 } 279 280 /// Loc - The location of this decl. 281 SourceLocation Loc; 282 283 /// DeclKind - This indicates which class this is. 284 unsigned DeclKind : 7; 285 286 /// InvalidDecl - This indicates a semantic error occurred. 287 unsigned InvalidDecl : 1; 288 289 /// HasAttrs - This indicates whether the decl has attributes or not. 290 unsigned HasAttrs : 1; 291 292 /// Implicit - Whether this declaration was implicitly generated by 293 /// the implementation rather than explicitly written by the user. 294 unsigned Implicit : 1; 295 296 /// Whether this declaration was "used", meaning that a definition is 297 /// required. 298 unsigned Used : 1; 299 300 /// Whether this declaration was "referenced". 301 /// The difference with 'Used' is whether the reference appears in a 302 /// evaluated context or not, e.g. functions used in uninstantiated templates 303 /// are regarded as "referenced" but not "used". 304 unsigned Referenced : 1; 305 306 /// Whether this declaration is a top-level declaration (function, 307 /// global variable, etc.) that is lexically inside an objc container 308 /// definition. 309 unsigned TopLevelDeclInObjCContainer : 1; 310 311 /// Whether statistic collection is enabled. 312 static bool StatisticsEnabled; 313 314protected: 315 friend class ASTDeclReader; 316 friend class ASTDeclWriter; 317 friend class ASTNodeImporter; 318 friend class ASTReader; 319 friend class CXXClassMemberWrapper; 320 friend class LinkageComputer; 321 template<typename decl_type> friend class Redeclarable; 322 323 /// Access - Used by C++ decls for the access specifier. 324 // NOTE: VC++ treats enums as signed, avoid using the AccessSpecifier enum 325 unsigned Access : 2; 326 327 /// Whether this declaration was loaded from an AST file. 328 unsigned FromASTFile : 1; 329 330 /// IdentifierNamespace - This specifies what IDNS_* namespace this lives in. 331 unsigned IdentifierNamespace : 14; 332 333 /// If 0, we have not computed the linkage of this declaration. 334 /// Otherwise, it is the linkage + 1. 335 mutable unsigned CacheValidAndLinkage : 3; 336 337 /// Allocate memory for a deserialized declaration. 338 /// 339 /// This routine must be used to allocate memory for any declaration that is 340 /// deserialized from a module file. 341 /// 342 /// \param Size The size of the allocated object. 343 /// \param Ctx The context in which we will allocate memory. 344 /// \param ID The global ID of the deserialized declaration. 345 /// \param Extra The amount of extra space to allocate after the object. 346 void *operator new(std::size_t Size, const ASTContext &Ctx, unsigned ID, 347 std::size_t Extra = 0); 348 349 /// Allocate memory for a non-deserialized declaration. 350 void *operator new(std::size_t Size, const ASTContext &Ctx, 351 DeclContext *Parent, std::size_t Extra = 0); 352 353private: 354 bool AccessDeclContextSanity() const; 355 356 /// Get the module ownership kind to use for a local lexical child of \p DC, 357 /// which may be either a local or (rarely) an imported declaration. 358 static ModuleOwnershipKind getModuleOwnershipKindForChildOf(DeclContext *DC) { 359 if (DC) { 360 auto *D = cast<Decl>(DC); 361 auto MOK = D->getModuleOwnershipKind(); 362 if (MOK != ModuleOwnershipKind::Unowned && 363 (!D->isFromASTFile() || D->hasLocalOwningModuleStorage())) 364 return MOK; 365 // If D is not local and we have no local module storage, then we don't 366 // need to track module ownership at all. 367 } 368 return ModuleOwnershipKind::Unowned; 369 } 370 371public: 372 Decl() = delete; 373 Decl(const Decl&) = delete; 374 Decl(Decl &&) = delete; 375 Decl &operator=(const Decl&) = delete; 376 Decl &operator=(Decl&&) = delete; 377 378protected: 379 Decl(Kind DK, DeclContext *DC, SourceLocation L) 380 : NextInContextAndBits(nullptr, getModuleOwnershipKindForChildOf(DC)), 381 DeclCtx(DC), Loc(L), DeclKind(DK), InvalidDecl(false), HasAttrs(false), 382 Implicit(false), Used(false), Referenced(false), 383 TopLevelDeclInObjCContainer(false), Access(AS_none), FromASTFile(0), 384 IdentifierNamespace(getIdentifierNamespaceForKind(DK)), 385 CacheValidAndLinkage(0) { 386 if (StatisticsEnabled) add(DK); 387 } 388 389 Decl(Kind DK, EmptyShell Empty) 390 : DeclKind(DK), InvalidDecl(false), HasAttrs(false), Implicit(false), 391 Used(false), Referenced(false), TopLevelDeclInObjCContainer(false), 392 Access(AS_none), FromASTFile(0), 393 IdentifierNamespace(getIdentifierNamespaceForKind(DK)), 394 CacheValidAndLinkage(0) { 395 if (StatisticsEnabled) add(DK); 396 } 397 398 virtual ~Decl(); 399 400 /// Update a potentially out-of-date declaration. 401 void updateOutOfDate(IdentifierInfo &II) const; 402 403 Linkage getCachedLinkage() const { 404 return Linkage(CacheValidAndLinkage - 1); 405 } 406 407 void setCachedLinkage(Linkage L) const { 408 CacheValidAndLinkage = L + 1; 409 } 410 411 bool hasCachedLinkage() const { 412 return CacheValidAndLinkage; 413 } 414 415public: 416 /// Source range that this declaration covers. 417 virtual SourceRange getSourceRange() const LLVM_READONLY { 418 return SourceRange(getLocation(), getLocation()); 419 } 420 421 SourceLocation getBeginLoc() const LLVM_READONLY { 422 return getSourceRange().getBegin(); 423 } 424 425 SourceLocation getEndLoc() const LLVM_READONLY { 426 return getSourceRange().getEnd(); 427 } 428 429 SourceLocation getLocation() const { return Loc; } 430 void setLocation(SourceLocation L) { Loc = L; } 431 432 Kind getKind() const { return static_cast<Kind>(DeclKind); } 433 const char *getDeclKindName() const; 434 435 Decl *getNextDeclInContext() { return NextInContextAndBits.getPointer(); } 436 const Decl *getNextDeclInContext() const {return NextInContextAndBits.getPointer();} 437 438 DeclContext *getDeclContext() { 439 if (isInSemaDC()) 440 return getSemanticDC(); 441 return getMultipleDC()->SemanticDC; 442 } 443 const DeclContext *getDeclContext() const { 444 return const_cast<Decl*>(this)->getDeclContext(); 445 } 446 447 /// Find the innermost non-closure ancestor of this declaration, 448 /// walking up through blocks, lambdas, etc. If that ancestor is 449 /// not a code context (!isFunctionOrMethod()), returns null. 450 /// 451 /// A declaration may be its own non-closure context. 452 Decl *getNonClosureContext(); 453 const Decl *getNonClosureContext() const { 454 return const_cast<Decl*>(this)->getNonClosureContext(); 455 } 456 457 TranslationUnitDecl *getTranslationUnitDecl(); 458 const TranslationUnitDecl *getTranslationUnitDecl() const { 459 return const_cast<Decl*>(this)->getTranslationUnitDecl(); 460 } 461 462 bool isInAnonymousNamespace() const; 463 464 bool isInStdNamespace() const; 465 466 ASTContext &getASTContext() const LLVM_READONLY; 467 468 void setAccess(AccessSpecifier AS) { 469 Access = AS; 470 assert(AccessDeclContextSanity()); 471 } 472 473 AccessSpecifier getAccess() const { 474 assert(AccessDeclContextSanity()); 475 return AccessSpecifier(Access); 476 } 477 478 /// Retrieve the access specifier for this declaration, even though 479 /// it may not yet have been properly set. 480 AccessSpecifier getAccessUnsafe() const { 481 return AccessSpecifier(Access); 482 } 483 484 bool hasAttrs() const { return HasAttrs; } 485 486 void setAttrs(const AttrVec& Attrs) { 487 return setAttrsImpl(Attrs, getASTContext()); 488 } 489 490 AttrVec &getAttrs() { 491 return const_cast<AttrVec&>(const_cast<const Decl*>(this)->getAttrs()); 492 } 493 494 const AttrVec &getAttrs() const; 495 void dropAttrs(); 496 void addAttr(Attr *A); 497 498 using attr_iterator = AttrVec::const_iterator; 499 using attr_range = llvm::iterator_range<attr_iterator>; 500 501 attr_range attrs() const { 502 return attr_range(attr_begin(), attr_end()); 503 } 504 505 attr_iterator attr_begin() const { 506 return hasAttrs() ? getAttrs().begin() : nullptr; 507 } 508 attr_iterator attr_end() const { 509 return hasAttrs() ? getAttrs().end() : nullptr; 510 } 511 512 template <typename T> 513 void dropAttr() { 514 if (!HasAttrs) return; 515 516 AttrVec &Vec = getAttrs(); 517 Vec.erase(std::remove_if(Vec.begin(), Vec.end(), isa<T, Attr*>), Vec.end()); 518 519 if (Vec.empty()) 520 HasAttrs = false; 521 } 522 523 template <typename T> 524 llvm::iterator_range<specific_attr_iterator<T>> specific_attrs() const { 525 return llvm::make_range(specific_attr_begin<T>(), specific_attr_end<T>()); 526 } 527 528 template <typename T> 529 specific_attr_iterator<T> specific_attr_begin() const { 530 return specific_attr_iterator<T>(attr_begin()); 531 } 532 533 template <typename T> 534 specific_attr_iterator<T> specific_attr_end() const { 535 return specific_attr_iterator<T>(attr_end()); 536 } 537 538 template<typename T> T *getAttr() const { 539 return hasAttrs() ? getSpecificAttr<T>(getAttrs()) : nullptr; 540 } 541 542 template<typename T> bool hasAttr() const { 543 return hasAttrs() && hasSpecificAttr<T>(getAttrs()); 544 } 545 546 /// getMaxAlignment - return the maximum alignment specified by attributes 547 /// on this decl, 0 if there are none. 548 unsigned getMaxAlignment() const; 549 550 /// setInvalidDecl - Indicates the Decl had a semantic error. This 551 /// allows for graceful error recovery. 552 void setInvalidDecl(bool Invalid = true); 553 bool isInvalidDecl() const { return (bool) InvalidDecl; } 554 555 /// isImplicit - Indicates whether the declaration was implicitly 556 /// generated by the implementation. If false, this declaration 557 /// was written explicitly in the source code. 558 bool isImplicit() const { return Implicit; } 559 void setImplicit(bool I = true) { Implicit = I; } 560 561 /// Whether *any* (re-)declaration of the entity was used, meaning that 562 /// a definition is required. 563 /// 564 /// \param CheckUsedAttr When true, also consider the "used" attribute 565 /// (in addition to the "used" bit set by \c setUsed()) when determining 566 /// whether the function is used. 567 bool isUsed(bool CheckUsedAttr = true) const; 568 569 /// Set whether the declaration is used, in the sense of odr-use. 570 /// 571 /// This should only be used immediately after creating a declaration. 572 /// It intentionally doesn't notify any listeners. 573 void setIsUsed() { getCanonicalDecl()->Used = true; } 574 575 /// Mark the declaration used, in the sense of odr-use. 576 /// 577 /// This notifies any mutation listeners in addition to setting a bit 578 /// indicating the declaration is used. 579 void markUsed(ASTContext &C); 580 581 /// Whether any declaration of this entity was referenced. 582 bool isReferenced() const; 583 584 /// Whether this declaration was referenced. This should not be relied 585 /// upon for anything other than debugging. 586 bool isThisDeclarationReferenced() const { return Referenced; } 587 588 void setReferenced(bool R = true) { Referenced = R; } 589 590 /// Whether this declaration is a top-level declaration (function, 591 /// global variable, etc.) that is lexically inside an objc container 592 /// definition. 593 bool isTopLevelDeclInObjCContainer() const { 594 return TopLevelDeclInObjCContainer; 595 } 596 597 void setTopLevelDeclInObjCContainer(bool V = true) { 598 TopLevelDeclInObjCContainer = V; 599 } 600 601 /// Looks on this and related declarations for an applicable 602 /// external source symbol attribute. 603 ExternalSourceSymbolAttr *getExternalSourceSymbolAttr() const; 604 605 /// Whether this declaration was marked as being private to the 606 /// module in which it was defined. 607 bool isModulePrivate() const { 608 return getModuleOwnershipKind() == ModuleOwnershipKind::ModulePrivate; 609 } 610 611 /// Return true if this declaration has an attribute which acts as 612 /// definition of the entity, such as 'alias' or 'ifunc'. 613 bool hasDefiningAttr() const; 614 615 /// Return this declaration's defining attribute if it has one. 616 const Attr *getDefiningAttr() const; 617 618protected: 619 /// Specify that this declaration was marked as being private 620 /// to the module in which it was defined. 621 void setModulePrivate() { 622 // The module-private specifier has no effect on unowned declarations. 623 // FIXME: We should track this in some way for source fidelity. 624 if (getModuleOwnershipKind() == ModuleOwnershipKind::Unowned) 625 return; 626 setModuleOwnershipKind(ModuleOwnershipKind::ModulePrivate); 627 } 628 629 /// Set the owning module ID. 630 void setOwningModuleID(unsigned ID) { 631 assert(isFromASTFile() && "Only works on a deserialized declaration"); 632 *((unsigned*)this - 2) = ID; 633 } 634 635public: 636 /// Determine the availability of the given declaration. 637 /// 638 /// This routine will determine the most restrictive availability of 639 /// the given declaration (e.g., preferring 'unavailable' to 640 /// 'deprecated'). 641 /// 642 /// \param Message If non-NULL and the result is not \c 643 /// AR_Available, will be set to a (possibly empty) message 644 /// describing why the declaration has not been introduced, is 645 /// deprecated, or is unavailable. 646 /// 647 /// \param EnclosingVersion The version to compare with. If empty, assume the 648 /// deployment target version. 649 /// 650 /// \param RealizedPlatform If non-NULL and the availability result is found 651 /// in an available attribute it will set to the platform which is written in 652 /// the available attribute. 653 AvailabilityResult 654 getAvailability(std::string *Message = nullptr, 655 VersionTuple EnclosingVersion = VersionTuple(), 656 StringRef *RealizedPlatform = nullptr) const; 657 658 /// Retrieve the version of the target platform in which this 659 /// declaration was introduced. 660 /// 661 /// \returns An empty version tuple if this declaration has no 'introduced' 662 /// availability attributes, or the version tuple that's specified in the 663 /// attribute otherwise. 664 VersionTuple getVersionIntroduced() const; 665 666 /// Determine whether this declaration is marked 'deprecated'. 667 /// 668 /// \param Message If non-NULL and the declaration is deprecated, 669 /// this will be set to the message describing why the declaration 670 /// was deprecated (which may be empty). 671 bool isDeprecated(std::string *Message = nullptr) const { 672 return getAvailability(Message) == AR_Deprecated; 673 } 674 675 /// Determine whether this declaration is marked 'unavailable'. 676 /// 677 /// \param Message If non-NULL and the declaration is unavailable, 678 /// this will be set to the message describing why the declaration 679 /// was made unavailable (which may be empty). 680 bool isUnavailable(std::string *Message = nullptr) const { 681 return getAvailability(Message) == AR_Unavailable; 682 } 683 684 /// Determine whether this is a weak-imported symbol. 685 /// 686 /// Weak-imported symbols are typically marked with the 687 /// 'weak_import' attribute, but may also be marked with an 688 /// 'availability' attribute where we're targing a platform prior to 689 /// the introduction of this feature. 690 bool isWeakImported() const; 691 692 /// Determines whether this symbol can be weak-imported, 693 /// e.g., whether it would be well-formed to add the weak_import 694 /// attribute. 695 /// 696 /// \param IsDefinition Set to \c true to indicate that this 697 /// declaration cannot be weak-imported because it has a definition. 698 bool canBeWeakImported(bool &IsDefinition) const; 699 700 /// Determine whether this declaration came from an AST file (such as 701 /// a precompiled header or module) rather than having been parsed. 702 bool isFromASTFile() const { return FromASTFile; } 703 704 /// Retrieve the global declaration ID associated with this 705 /// declaration, which specifies where this Decl was loaded from. 706 unsigned getGlobalID() const { 707 if (isFromASTFile()) 708 return *((const unsigned*)this - 1); 709 return 0; 710 } 711 712 /// Retrieve the global ID of the module that owns this particular 713 /// declaration. 714 unsigned getOwningModuleID() const { 715 if (isFromASTFile()) 716 return *((const unsigned*)this - 2); 717 return 0; 718 } 719 720private: 721 Module *getOwningModuleSlow() const; 722 723protected: 724 bool hasLocalOwningModuleStorage() const; 725 726public: 727 /// Get the imported owning module, if this decl is from an imported 728 /// (non-local) module. 729 Module *getImportedOwningModule() const { 730 if (!isFromASTFile() || !hasOwningModule()) 731 return nullptr; 732 733 return getOwningModuleSlow(); 734 } 735 736 /// Get the local owning module, if known. Returns nullptr if owner is 737 /// not yet known or declaration is not from a module. 738 Module *getLocalOwningModule() const { 739 if (isFromASTFile() || !hasOwningModule()) 740 return nullptr; 741 742 assert(hasLocalOwningModuleStorage() && 743 "owned local decl but no local module storage"); 744 return reinterpret_cast<Module *const *>(this)[-1]; 745 } 746 void setLocalOwningModule(Module *M) { 747 assert(!isFromASTFile() && hasOwningModule() && 748 hasLocalOwningModuleStorage() && 749 "should not have a cached owning module"); 750 reinterpret_cast<Module **>(this)[-1] = M; 751 } 752 753 /// Is this declaration owned by some module? 754 bool hasOwningModule() const { 755 return getModuleOwnershipKind() != ModuleOwnershipKind::Unowned; 756 } 757 758 /// Get the module that owns this declaration (for visibility purposes). 759 Module *getOwningModule() const { 760 return isFromASTFile() ? getImportedOwningModule() : getLocalOwningModule(); 761 } 762 763 /// Get the module that owns this declaration for linkage purposes. 764 /// There only ever is such a module under the C++ Modules TS. 765 /// 766 /// \param IgnoreLinkage Ignore the linkage of the entity; assume that 767 /// all declarations in a global module fragment are unowned. 768 Module *getOwningModuleForLinkage(bool IgnoreLinkage = false) const; 769 770 /// Determine whether this declaration might be hidden from name 771 /// lookup. Note that the declaration might be visible even if this returns 772 /// \c false, if the owning module is visible within the query context. 773 // FIXME: Rename this to make it clearer what it does. 774 bool isHidden() const { 775 return (int)getModuleOwnershipKind() > (int)ModuleOwnershipKind::Visible; 776 } 777 778 /// Set that this declaration is globally visible, even if it came from a 779 /// module that is not visible. 780 void setVisibleDespiteOwningModule() { 781 if (isHidden()) 782 setModuleOwnershipKind(ModuleOwnershipKind::Visible); 783 } 784 785 /// Get the kind of module ownership for this declaration. 786 ModuleOwnershipKind getModuleOwnershipKind() const { 787 return NextInContextAndBits.getInt(); 788 } 789 790 /// Set whether this declaration is hidden from name lookup. 791 void setModuleOwnershipKind(ModuleOwnershipKind MOK) { 792 assert(!(getModuleOwnershipKind() == ModuleOwnershipKind::Unowned && 793 MOK != ModuleOwnershipKind::Unowned && !isFromASTFile() && 794 !hasLocalOwningModuleStorage()) && 795 "no storage available for owning module for this declaration"); 796 NextInContextAndBits.setInt(MOK); 797 } 798 799 unsigned getIdentifierNamespace() const { 800 return IdentifierNamespace; 801 } 802 803 bool isInIdentifierNamespace(unsigned NS) const { 804 return getIdentifierNamespace() & NS; 805 } 806 807 static unsigned getIdentifierNamespaceForKind(Kind DK); 808 809 bool hasTagIdentifierNamespace() const { 810 return isTagIdentifierNamespace(getIdentifierNamespace()); 811 } 812 813 static bool isTagIdentifierNamespace(unsigned NS) { 814 // TagDecls have Tag and Type set and may also have TagFriend. 815 return (NS & ~IDNS_TagFriend) == (IDNS_Tag | IDNS_Type); 816 } 817 818 /// getLexicalDeclContext - The declaration context where this Decl was 819 /// lexically declared (LexicalDC). May be different from 820 /// getDeclContext() (SemanticDC). 821 /// e.g.: 822 /// 823 /// namespace A { 824 /// void f(); // SemanticDC == LexicalDC == 'namespace A' 825 /// } 826 /// void A::f(); // SemanticDC == namespace 'A' 827 /// // LexicalDC == global namespace 828 DeclContext *getLexicalDeclContext() { 829 if (isInSemaDC()) 830 return getSemanticDC(); 831 return getMultipleDC()->LexicalDC; 832 } 833 const DeclContext *getLexicalDeclContext() const { 834 return const_cast<Decl*>(this)->getLexicalDeclContext(); 835 } 836 837 /// Determine whether this declaration is declared out of line (outside its 838 /// semantic context). 839 virtual bool isOutOfLine() const; 840 841 /// setDeclContext - Set both the semantic and lexical DeclContext 842 /// to DC. 843 void setDeclContext(DeclContext *DC); 844 845 void setLexicalDeclContext(DeclContext *DC); 846 847 /// Determine whether this declaration is a templated entity (whether it is 848 // within the scope of a template parameter). 849 bool isTemplated() const; 850 851 /// isDefinedOutsideFunctionOrMethod - This predicate returns true if this 852 /// scoped decl is defined outside the current function or method. This is 853 /// roughly global variables and functions, but also handles enums (which 854 /// could be defined inside or outside a function etc). 855 bool isDefinedOutsideFunctionOrMethod() const { 856 return getParentFunctionOrMethod() == nullptr; 857 } 858 859 /// Returns true if this declaration lexically is inside a function. 860 /// It recognizes non-defining declarations as well as members of local 861 /// classes: 862 /// \code 863 /// void foo() { void bar(); } 864 /// void foo2() { class ABC { void bar(); }; } 865 /// \endcode 866 bool isLexicallyWithinFunctionOrMethod() const; 867 868 /// If this decl is defined inside a function/method/block it returns 869 /// the corresponding DeclContext, otherwise it returns null. 870 const DeclContext *getParentFunctionOrMethod() const; 871 DeclContext *getParentFunctionOrMethod() { 872 return const_cast<DeclContext*>( 873 const_cast<const Decl*>(this)->getParentFunctionOrMethod()); 874 } 875 876 /// Retrieves the "canonical" declaration of the given declaration. 877 virtual Decl *getCanonicalDecl() { return this; } 878 const Decl *getCanonicalDecl() const { 879 return const_cast<Decl*>(this)->getCanonicalDecl(); 880 } 881 882 /// Whether this particular Decl is a canonical one. 883 bool isCanonicalDecl() const { return getCanonicalDecl() == this; } 884 885protected: 886 /// Returns the next redeclaration or itself if this is the only decl. 887 /// 888 /// Decl subclasses that can be redeclared should override this method so that 889 /// Decl::redecl_iterator can iterate over them. 890 virtual Decl *getNextRedeclarationImpl() { return this; } 891 892 /// Implementation of getPreviousDecl(), to be overridden by any 893 /// subclass that has a redeclaration chain. 894 virtual Decl *getPreviousDeclImpl() { return nullptr; } 895 896 /// Implementation of getMostRecentDecl(), to be overridden by any 897 /// subclass that has a redeclaration chain. 898 virtual Decl *getMostRecentDeclImpl() { return this; } 899 900public: 901 /// Iterates through all the redeclarations of the same decl. 902 class redecl_iterator { 903 /// Current - The current declaration. 904 Decl *Current = nullptr; 905 Decl *Starter; 906 907 public: 908 using value_type = Decl *; 909 using reference = const value_type &; 910 using pointer = const value_type *; 911 using iterator_category = std::forward_iterator_tag; 912 using difference_type = std::ptrdiff_t; 913 914 redecl_iterator() = default; 915 explicit redecl_iterator(Decl *C) : Current(C), Starter(C) {} 916 917 reference operator*() const { return Current; } 918 value_type operator->() const { return Current; } 919 920 redecl_iterator& operator++() { 921 assert(Current && "Advancing while iterator has reached end"); 922 // Get either previous decl or latest decl. 923 Decl *Next = Current->getNextRedeclarationImpl(); 924 assert(Next && "Should return next redeclaration or itself, never null!"); 925 Current = (Next != Starter) ? Next : nullptr; 926 return *this; 927 } 928 929 redecl_iterator operator++(int) { 930 redecl_iterator tmp(*this); 931 ++(*this); 932 return tmp; 933 } 934 935 friend bool operator==(redecl_iterator x, redecl_iterator y) { 936 return x.Current == y.Current; 937 } 938 939 friend bool operator!=(redecl_iterator x, redecl_iterator y) { 940 return x.Current != y.Current; 941 } 942 }; 943 944 using redecl_range = llvm::iterator_range<redecl_iterator>; 945 946 /// Returns an iterator range for all the redeclarations of the same 947 /// decl. It will iterate at least once (when this decl is the only one). 948 redecl_range redecls() const { 949 return redecl_range(redecls_begin(), redecls_end()); 950 } 951 952 redecl_iterator redecls_begin() const { 953 return redecl_iterator(const_cast<Decl *>(this)); 954 } 955 956 redecl_iterator redecls_end() const { return redecl_iterator(); } 957 958 /// Retrieve the previous declaration that declares the same entity 959 /// as this declaration, or NULL if there is no previous declaration. 960 Decl *getPreviousDecl() { return getPreviousDeclImpl(); } 961 962 /// Retrieve the previous declaration that declares the same entity 963 /// as this declaration, or NULL if there is no previous declaration. 964 const Decl *getPreviousDecl() const { 965 return const_cast<Decl *>(this)->getPreviousDeclImpl(); 966 } 967 968 /// True if this is the first declaration in its redeclaration chain. 969 bool isFirstDecl() const { 970 return getPreviousDecl() == nullptr; 971 } 972 973 /// Retrieve the most recent declaration that declares the same entity 974 /// as this declaration (which may be this declaration). 975 Decl *getMostRecentDecl() { return getMostRecentDeclImpl(); } 976 977 /// Retrieve the most recent declaration that declares the same entity 978 /// as this declaration (which may be this declaration). 979 const Decl *getMostRecentDecl() const { 980 return const_cast<Decl *>(this)->getMostRecentDeclImpl(); 981 } 982 983 /// getBody - If this Decl represents a declaration for a body of code, 984 /// such as a function or method definition, this method returns the 985 /// top-level Stmt* of that body. Otherwise this method returns null. 986 virtual Stmt* getBody() const { return nullptr; } 987 988 /// Returns true if this \c Decl represents a declaration for a body of 989 /// code, such as a function or method definition. 990 /// Note that \c hasBody can also return true if any redeclaration of this 991 /// \c Decl represents a declaration for a body of code. 992 virtual bool hasBody() const { return getBody() != nullptr; } 993 994 /// getBodyRBrace - Gets the right brace of the body, if a body exists. 995 /// This works whether the body is a CompoundStmt or a CXXTryStmt. 996 SourceLocation getBodyRBrace() const; 997 998 // global temp stats (until we have a per-module visitor) 999 static void add(Kind k); 1000 static void EnableStatistics(); 1001 static void PrintStats(); 1002 1003 /// isTemplateParameter - Determines whether this declaration is a 1004 /// template parameter. 1005 bool isTemplateParameter() const; 1006 1007 /// isTemplateParameter - Determines whether this declaration is a 1008 /// template parameter pack. 1009 bool isTemplateParameterPack() const; 1010 1011 /// Whether this declaration is a parameter pack. 1012 bool isParameterPack() const; 1013 1014 /// returns true if this declaration is a template 1015 bool isTemplateDecl() const; 1016 1017 /// Whether this declaration is a function or function template. 1018 bool isFunctionOrFunctionTemplate() const { 1019 return (DeclKind >= Decl::firstFunction && 1020 DeclKind <= Decl::lastFunction) || 1021 DeclKind == FunctionTemplate; 1022 } 1023 1024 /// If this is a declaration that describes some template, this 1025 /// method returns that template declaration. 1026 TemplateDecl *getDescribedTemplate() const; 1027 1028 /// Returns the function itself, or the templated function if this is a 1029 /// function template. 1030 FunctionDecl *getAsFunction() LLVM_READONLY; 1031 1032 const FunctionDecl *getAsFunction() const { 1033 return const_cast<Decl *>(this)->getAsFunction(); 1034 } 1035 1036 /// Changes the namespace of this declaration to reflect that it's 1037 /// a function-local extern declaration. 1038 /// 1039 /// These declarations appear in the lexical context of the extern 1040 /// declaration, but in the semantic context of the enclosing namespace 1041 /// scope. 1042 void setLocalExternDecl() { 1043 Decl *Prev = getPreviousDecl(); 1044 IdentifierNamespace &= ~IDNS_Ordinary; 1045 1046 // It's OK for the declaration to still have the "invisible friend" flag or 1047 // the "conflicts with tag declarations in this scope" flag for the outer 1048 // scope. 1049 assert((IdentifierNamespace & ~(IDNS_OrdinaryFriend | IDNS_Tag)) == 0 && 1050 "namespace is not ordinary"); 1051 1052 IdentifierNamespace |= IDNS_LocalExtern; 1053 if (Prev && Prev->getIdentifierNamespace() & IDNS_Ordinary) 1054 IdentifierNamespace |= IDNS_Ordinary; 1055 } 1056 1057 /// Determine whether this is a block-scope declaration with linkage. 1058 /// This will either be a local variable declaration declared 'extern', or a 1059 /// local function declaration. 1060 bool isLocalExternDecl() { 1061 return IdentifierNamespace & IDNS_LocalExtern; 1062 } 1063 1064 /// Changes the namespace of this declaration to reflect that it's 1065 /// the object of a friend declaration. 1066 /// 1067 /// These declarations appear in the lexical context of the friending 1068 /// class, but in the semantic context of the actual entity. This property 1069 /// applies only to a specific decl object; other redeclarations of the 1070 /// same entity may not (and probably don't) share this property. 1071 void setObjectOfFriendDecl(bool PerformFriendInjection = false) { 1072 unsigned OldNS = IdentifierNamespace; 1073 assert((OldNS & (IDNS_Tag | IDNS_Ordinary | 1074 IDNS_TagFriend | IDNS_OrdinaryFriend | 1075 IDNS_LocalExtern | IDNS_NonMemberOperator)) && 1076 "namespace includes neither ordinary nor tag"); 1077 assert(!(OldNS & ~(IDNS_Tag | IDNS_Ordinary | IDNS_Type | 1078 IDNS_TagFriend | IDNS_OrdinaryFriend | 1079 IDNS_LocalExtern | IDNS_NonMemberOperator)) && 1080 "namespace includes other than ordinary or tag"); 1081 1082 Decl *Prev = getPreviousDecl(); 1083 IdentifierNamespace &= ~(IDNS_Ordinary | IDNS_Tag | IDNS_Type); 1084 1085 if (OldNS & (IDNS_Tag | IDNS_TagFriend)) { 1086 IdentifierNamespace |= IDNS_TagFriend; 1087 if (PerformFriendInjection || 1088 (Prev && Prev->getIdentifierNamespace() & IDNS_Tag)) 1089 IdentifierNamespace |= IDNS_Tag | IDNS_Type; 1090 } 1091 1092 if (OldNS & (IDNS_Ordinary | IDNS_OrdinaryFriend | 1093 IDNS_LocalExtern | IDNS_NonMemberOperator)) { 1094 IdentifierNamespace |= IDNS_OrdinaryFriend; 1095 if (PerformFriendInjection || 1096 (Prev && Prev->getIdentifierNamespace() & IDNS_Ordinary)) 1097 IdentifierNamespace |= IDNS_Ordinary; 1098 } 1099 } 1100 1101 enum FriendObjectKind { 1102 FOK_None, ///< Not a friend object. 1103 FOK_Declared, ///< A friend of a previously-declared entity. 1104 FOK_Undeclared ///< A friend of a previously-undeclared entity. 1105 }; 1106 1107 /// Determines whether this declaration is the object of a 1108 /// friend declaration and, if so, what kind. 1109 /// 1110 /// There is currently no direct way to find the associated FriendDecl. 1111 FriendObjectKind getFriendObjectKind() const { 1112 unsigned mask = 1113 (IdentifierNamespace & (IDNS_TagFriend | IDNS_OrdinaryFriend)); 1114 if (!mask) return FOK_None; 1115 return (IdentifierNamespace & (IDNS_Tag | IDNS_Ordinary) ? FOK_Declared 1116 : FOK_Undeclared); 1117 } 1118 1119 /// Specifies that this declaration is a C++ overloaded non-member. 1120 void setNonMemberOperator() { 1121 assert(getKind() == Function || getKind() == FunctionTemplate); 1122 assert((IdentifierNamespace & IDNS_Ordinary) && 1123 "visible non-member operators should be in ordinary namespace"); 1124 IdentifierNamespace |= IDNS_NonMemberOperator; 1125 } 1126 1127 static bool classofKind(Kind K) { return true; } 1128 static DeclContext *castToDeclContext(const Decl *); 1129 static Decl *castFromDeclContext(const DeclContext *); 1130 1131 void print(raw_ostream &Out, unsigned Indentation = 0, 1132 bool PrintInstantiation = false) const; 1133 void print(raw_ostream &Out, const PrintingPolicy &Policy, 1134 unsigned Indentation = 0, bool PrintInstantiation = false) const; 1135 static void printGroup(Decl** Begin, unsigned NumDecls, 1136 raw_ostream &Out, const PrintingPolicy &Policy, 1137 unsigned Indentation = 0); 1138 1139 // Debuggers don't usually respect default arguments. 1140 void dump() const; 1141 1142 // Same as dump(), but forces color printing. 1143 void dumpColor() const; 1144 1145 void dump(raw_ostream &Out, bool Deserialize = false, 1146 ASTDumpOutputFormat OutputFormat = ADOF_Default) const; 1147 1148 /// \return Unique reproducible object identifier 1149 int64_t getID() const; 1150 1151 /// Looks through the Decl's underlying type to extract a FunctionType 1152 /// when possible. Will return null if the type underlying the Decl does not 1153 /// have a FunctionType. 1154 const FunctionType *getFunctionType(bool BlocksToo = true) const; 1155 1156private: 1157 void setAttrsImpl(const AttrVec& Attrs, ASTContext &Ctx); 1158 void setDeclContextsImpl(DeclContext *SemaDC, DeclContext *LexicalDC, 1159 ASTContext &Ctx); 1160 1161protected: 1162 ASTMutationListener *getASTMutationListener() const; 1163}; 1164 1165/// Determine whether two declarations declare the same entity. 1166inline bool declaresSameEntity(const Decl *D1, const Decl *D2) { 1167 if (!D1 || !D2) 1168 return false; 1169 1170 if (D1 == D2) 1171 return true; 1172 1173 return D1->getCanonicalDecl() == D2->getCanonicalDecl(); 1174} 1175 1176/// PrettyStackTraceDecl - If a crash occurs, indicate that it happened when 1177/// doing something to a specific decl. 1178class PrettyStackTraceDecl : public llvm::PrettyStackTraceEntry { 1179 const Decl *TheDecl; 1180 SourceLocation Loc; 1181 SourceManager &SM; 1182 const char *Message; 1183 1184public: 1185 PrettyStackTraceDecl(const Decl *theDecl, SourceLocation L, 1186 SourceManager &sm, const char *Msg) 1187 : TheDecl(theDecl), Loc(L), SM(sm), Message(Msg) {} 1188 1189 void print(raw_ostream &OS) const override; 1190}; 1191 1192/// The results of name lookup within a DeclContext. This is either a 1193/// single result (with no stable storage) or a collection of results (with 1194/// stable storage provided by the lookup table). 1195class DeclContextLookupResult { 1196 using ResultTy = ArrayRef<NamedDecl *>; 1197 1198 ResultTy Result; 1199 1200 // If there is only one lookup result, it would be invalidated by 1201 // reallocations of the name table, so store it separately. 1202 NamedDecl *Single = nullptr; 1203 1204 static NamedDecl *const SingleElementDummyList; 1205 1206public: 1207 DeclContextLookupResult() = default; 1208 DeclContextLookupResult(ArrayRef<NamedDecl *> Result) 1209 : Result(Result) {} 1210 DeclContextLookupResult(NamedDecl *Single) 1211 : Result(SingleElementDummyList), Single(Single) {} 1212 1213 class iterator; 1214 1215 using IteratorBase = 1216 llvm::iterator_adaptor_base<iterator, ResultTy::iterator, 1217 std::random_access_iterator_tag, 1218 NamedDecl *const>; 1219 1220 class iterator : public IteratorBase { 1221 value_type SingleElement; 1222 1223 public: 1224 explicit iterator(pointer Pos, value_type Single = nullptr) 1225 : IteratorBase(Pos), SingleElement(Single) {} 1226 1227 reference operator*() const { 1228 return SingleElement ? SingleElement : IteratorBase::operator*(); 1229 } 1230 }; 1231 1232 using const_iterator = iterator; 1233 using pointer = iterator::pointer; 1234 using reference = iterator::reference; 1235 1236 iterator begin() const { return iterator(Result.begin(), Single); } 1237 iterator end() const { return iterator(Result.end(), Single); } 1238 1239 bool empty() const { return Result.empty(); } 1240 pointer data() const { return Single ? &Single : Result.data(); } 1241 size_t size() const { return Single ? 1 : Result.size(); } 1242 reference front() const { return Single ? Single : Result.front(); } 1243 reference back() const { return Single ? Single : Result.back(); } 1244 reference operator[](size_t N) const { return Single ? Single : Result[N]; } 1245 1246 // FIXME: Remove this from the interface 1247 DeclContextLookupResult slice(size_t N) const { 1248 DeclContextLookupResult Sliced = Result.slice(N); 1249 Sliced.Single = Single; 1250 return Sliced; 1251 } 1252}; 1253 1254/// DeclContext - This is used only as base class of specific decl types that 1255/// can act as declaration contexts. These decls are (only the top classes 1256/// that directly derive from DeclContext are mentioned, not their subclasses): 1257/// 1258/// TranslationUnitDecl 1259/// ExternCContext 1260/// NamespaceDecl 1261/// TagDecl 1262/// OMPDeclareReductionDecl 1263/// OMPDeclareMapperDecl 1264/// FunctionDecl 1265/// ObjCMethodDecl 1266/// ObjCContainerDecl 1267/// LinkageSpecDecl 1268/// ExportDecl 1269/// BlockDecl 1270/// CapturedDecl 1271class DeclContext { 1272 /// For makeDeclVisibleInContextImpl 1273 friend class ASTDeclReader; 1274 /// For reconcileExternalVisibleStorage, CreateStoredDeclsMap, 1275 /// hasNeedToReconcileExternalVisibleStorage 1276 friend class ExternalASTSource; 1277 /// For CreateStoredDeclsMap 1278 friend class DependentDiagnostic; 1279 /// For hasNeedToReconcileExternalVisibleStorage, 1280 /// hasLazyLocalLexicalLookups, hasLazyExternalLexicalLookups 1281 friend class ASTWriter; 1282 1283 // We use uint64_t in the bit-fields below since some bit-fields 1284 // cross the unsigned boundary and this breaks the packing. 1285 1286 /// Stores the bits used by DeclContext. 1287 /// If modified NumDeclContextBit, the ctor of DeclContext and the accessor 1288 /// methods in DeclContext should be updated appropriately. 1289 class DeclContextBitfields { 1290 friend class DeclContext; 1291 /// DeclKind - This indicates which class this is. 1292 uint64_t DeclKind : 7; 1293 1294 /// Whether this declaration context also has some external 1295 /// storage that contains additional declarations that are lexically 1296 /// part of this context. 1297 mutable uint64_t ExternalLexicalStorage : 1; 1298 1299 /// Whether this declaration context also has some external 1300 /// storage that contains additional declarations that are visible 1301 /// in this context. 1302 mutable uint64_t ExternalVisibleStorage : 1; 1303 1304 /// Whether this declaration context has had externally visible 1305 /// storage added since the last lookup. In this case, \c LookupPtr's 1306 /// invariant may not hold and needs to be fixed before we perform 1307 /// another lookup. 1308 mutable uint64_t NeedToReconcileExternalVisibleStorage : 1; 1309 1310 /// If \c true, this context may have local lexical declarations 1311 /// that are missing from the lookup table. 1312 mutable uint64_t HasLazyLocalLexicalLookups : 1; 1313 1314 /// If \c true, the external source may have lexical declarations 1315 /// that are missing from the lookup table. 1316 mutable uint64_t HasLazyExternalLexicalLookups : 1; 1317 1318 /// If \c true, lookups should only return identifier from 1319 /// DeclContext scope (for example TranslationUnit). Used in 1320 /// LookupQualifiedName() 1321 mutable uint64_t UseQualifiedLookup : 1; 1322 }; 1323 1324 /// Number of bits in DeclContextBitfields. 1325 enum { NumDeclContextBits = 13 }; 1326 1327 /// Stores the bits used by TagDecl. 1328 /// If modified NumTagDeclBits and the accessor 1329 /// methods in TagDecl should be updated appropriately. 1330 class TagDeclBitfields { 1331 friend class TagDecl; 1332 /// For the bits in DeclContextBitfields 1333 uint64_t : NumDeclContextBits; 1334 1335 /// The TagKind enum. 1336 uint64_t TagDeclKind : 3; 1337 1338 /// True if this is a definition ("struct foo {};"), false if it is a 1339 /// declaration ("struct foo;"). It is not considered a definition 1340 /// until the definition has been fully processed. 1341 uint64_t IsCompleteDefinition : 1; 1342 1343 /// True if this is currently being defined. 1344 uint64_t IsBeingDefined : 1; 1345 1346 /// True if this tag declaration is "embedded" (i.e., defined or declared 1347 /// for the very first time) in the syntax of a declarator. 1348 uint64_t IsEmbeddedInDeclarator : 1; 1349 1350 /// True if this tag is free standing, e.g. "struct foo;". 1351 uint64_t IsFreeStanding : 1; 1352 1353 /// Indicates whether it is possible for declarations of this kind 1354 /// to have an out-of-date definition. 1355 /// 1356 /// This option is only enabled when modules are enabled. 1357 uint64_t MayHaveOutOfDateDef : 1; 1358 1359 /// Has the full definition of this type been required by a use somewhere in 1360 /// the TU. 1361 uint64_t IsCompleteDefinitionRequired : 1; 1362 }; 1363 1364 /// Number of non-inherited bits in TagDeclBitfields. 1365 enum { NumTagDeclBits = 9 }; 1366 1367 /// Stores the bits used by EnumDecl. 1368 /// If modified NumEnumDeclBit and the accessor 1369 /// methods in EnumDecl should be updated appropriately. 1370 class EnumDeclBitfields { 1371 friend class EnumDecl; 1372 /// For the bits in DeclContextBitfields. 1373 uint64_t : NumDeclContextBits; 1374 /// For the bits in TagDeclBitfields. 1375 uint64_t : NumTagDeclBits; 1376 1377 /// Width in bits required to store all the non-negative 1378 /// enumerators of this enum. 1379 uint64_t NumPositiveBits : 8; 1380 1381 /// Width in bits required to store all the negative 1382 /// enumerators of this enum. 1383 uint64_t NumNegativeBits : 8; 1384 1385 /// True if this tag declaration is a scoped enumeration. Only 1386 /// possible in C++11 mode. 1387 uint64_t IsScoped : 1; 1388 1389 /// If this tag declaration is a scoped enum, 1390 /// then this is true if the scoped enum was declared using the class 1391 /// tag, false if it was declared with the struct tag. No meaning is 1392 /// associated if this tag declaration is not a scoped enum. 1393 uint64_t IsScopedUsingClassTag : 1; 1394 1395 /// True if this is an enumeration with fixed underlying type. Only 1396 /// possible in C++11, Microsoft extensions, or Objective C mode. 1397 uint64_t IsFixed : 1; 1398 1399 /// True if a valid hash is stored in ODRHash. 1400 uint64_t HasODRHash : 1; 1401 }; 1402 1403 /// Number of non-inherited bits in EnumDeclBitfields. 1404 enum { NumEnumDeclBits = 20 }; 1405 1406 /// Stores the bits used by RecordDecl. 1407 /// If modified NumRecordDeclBits and the accessor 1408 /// methods in RecordDecl should be updated appropriately. 1409 class RecordDeclBitfields { 1410 friend class RecordDecl; 1411 /// For the bits in DeclContextBitfields. 1412 uint64_t : NumDeclContextBits; 1413 /// For the bits in TagDeclBitfields. 1414 uint64_t : NumTagDeclBits; 1415 1416 /// This is true if this struct ends with a flexible 1417 /// array member (e.g. int X[]) or if this union contains a struct that does. 1418 /// If so, this cannot be contained in arrays or other structs as a member. 1419 uint64_t HasFlexibleArrayMember : 1; 1420 1421 /// Whether this is the type of an anonymous struct or union. 1422 uint64_t AnonymousStructOrUnion : 1; 1423 1424 /// This is true if this struct has at least one member 1425 /// containing an Objective-C object pointer type. 1426 uint64_t HasObjectMember : 1; 1427 1428 /// This is true if struct has at least one member of 1429 /// 'volatile' type. 1430 uint64_t HasVolatileMember : 1; 1431 1432 /// Whether the field declarations of this record have been loaded 1433 /// from external storage. To avoid unnecessary deserialization of 1434 /// methods/nested types we allow deserialization of just the fields 1435 /// when needed. 1436 mutable uint64_t LoadedFieldsFromExternalStorage : 1; 1437 1438 /// Basic properties of non-trivial C structs. 1439 uint64_t NonTrivialToPrimitiveDefaultInitialize : 1; 1440 uint64_t NonTrivialToPrimitiveCopy : 1; 1441 uint64_t NonTrivialToPrimitiveDestroy : 1; 1442 1443 /// The following bits indicate whether this is or contains a C union that 1444 /// is non-trivial to default-initialize, destruct, or copy. These bits 1445 /// imply the associated basic non-triviality predicates declared above. 1446 uint64_t HasNonTrivialToPrimitiveDefaultInitializeCUnion : 1; 1447 uint64_t HasNonTrivialToPrimitiveDestructCUnion : 1; 1448 uint64_t HasNonTrivialToPrimitiveCopyCUnion : 1; 1449 1450 /// Indicates whether this struct is destroyed in the callee. 1451 uint64_t ParamDestroyedInCallee : 1; 1452 1453 /// Represents the way this type is passed to a function. 1454 uint64_t ArgPassingRestrictions : 2; 1455 }; 1456 1457 /// Number of non-inherited bits in RecordDeclBitfields. 1458 enum { NumRecordDeclBits = 14 }; 1459 1460 /// Stores the bits used by OMPDeclareReductionDecl. 1461 /// If modified NumOMPDeclareReductionDeclBits and the accessor 1462 /// methods in OMPDeclareReductionDecl should be updated appropriately. 1463 class OMPDeclareReductionDeclBitfields { 1464 friend class OMPDeclareReductionDecl; 1465 /// For the bits in DeclContextBitfields 1466 uint64_t : NumDeclContextBits; 1467 1468 /// Kind of initializer, 1469 /// function call or omp_priv<init_expr> initializtion. 1470 uint64_t InitializerKind : 2; 1471 }; 1472 1473 /// Number of non-inherited bits in OMPDeclareReductionDeclBitfields. 1474 enum { NumOMPDeclareReductionDeclBits = 2 }; 1475 1476 /// Stores the bits used by FunctionDecl. 1477 /// If modified NumFunctionDeclBits and the accessor 1478 /// methods in FunctionDecl and CXXDeductionGuideDecl 1479 /// (for IsCopyDeductionCandidate) should be updated appropriately. 1480 class FunctionDeclBitfields { 1481 friend class FunctionDecl; 1482 /// For IsCopyDeductionCandidate 1483 friend class CXXDeductionGuideDecl; 1484 /// For the bits in DeclContextBitfields. 1485 uint64_t : NumDeclContextBits; 1486 1487 uint64_t SClass : 3; 1488 uint64_t IsInline : 1; 1489 uint64_t IsInlineSpecified : 1; 1490 1491 uint64_t IsVirtualAsWritten : 1; 1492 uint64_t IsPure : 1; 1493 uint64_t HasInheritedPrototype : 1; 1494 uint64_t HasWrittenPrototype : 1; 1495 uint64_t IsDeleted : 1; 1496 /// Used by CXXMethodDecl 1497 uint64_t IsTrivial : 1; 1498 1499 /// This flag indicates whether this function is trivial for the purpose of 1500 /// calls. This is meaningful only when this function is a copy/move 1501 /// constructor or a destructor. 1502 uint64_t IsTrivialForCall : 1; 1503 1504 uint64_t IsDefaulted : 1; 1505 uint64_t IsExplicitlyDefaulted : 1; 1506 uint64_t HasDefaultedFunctionInfo : 1; 1507 uint64_t HasImplicitReturnZero : 1; 1508 uint64_t IsLateTemplateParsed : 1; 1509 1510 /// Kind of contexpr specifier as defined by ConstexprSpecKind. 1511 uint64_t ConstexprKind : 2; 1512 uint64_t InstantiationIsPending : 1; 1513 1514 /// Indicates if the function uses __try. 1515 uint64_t UsesSEHTry : 1; 1516 1517 /// Indicates if the function was a definition 1518 /// but its body was skipped. 1519 uint64_t HasSkippedBody : 1; 1520 1521 /// Indicates if the function declaration will 1522 /// have a body, once we're done parsing it. 1523 uint64_t WillHaveBody : 1; 1524 1525 /// Indicates that this function is a multiversioned 1526 /// function using attribute 'target'. 1527 uint64_t IsMultiVersion : 1; 1528 1529 /// [C++17] Only used by CXXDeductionGuideDecl. Indicates that 1530 /// the Deduction Guide is the implicitly generated 'copy 1531 /// deduction candidate' (is used during overload resolution). 1532 uint64_t IsCopyDeductionCandidate : 1; 1533 1534 /// Store the ODRHash after first calculation. 1535 uint64_t HasODRHash : 1; 1536 1537 /// Indicates if the function uses Floating Point Constrained Intrinsics 1538 uint64_t UsesFPIntrin : 1; 1539 }; 1540 1541 /// Number of non-inherited bits in FunctionDeclBitfields. 1542 enum { NumFunctionDeclBits = 27 }; 1543 1544 /// Stores the bits used by CXXConstructorDecl. If modified 1545 /// NumCXXConstructorDeclBits and the accessor 1546 /// methods in CXXConstructorDecl should be updated appropriately. 1547 class CXXConstructorDeclBitfields { 1548 friend class CXXConstructorDecl; 1549 /// For the bits in DeclContextBitfields. 1550 uint64_t : NumDeclContextBits; 1551 /// For the bits in FunctionDeclBitfields. 1552 uint64_t : NumFunctionDeclBits; 1553 1554 /// 24 bits to fit in the remaining available space. 1555 /// Note that this makes CXXConstructorDeclBitfields take 1556 /// exactly 64 bits and thus the width of NumCtorInitializers 1557 /// will need to be shrunk if some bit is added to NumDeclContextBitfields, 1558 /// NumFunctionDeclBitfields or CXXConstructorDeclBitfields. 1559 uint64_t NumCtorInitializers : 21; 1560 uint64_t IsInheritingConstructor : 1; 1561 1562 /// Whether this constructor has a trail-allocated explicit specifier. 1563 uint64_t HasTrailingExplicitSpecifier : 1; 1564 /// If this constructor does't have a trail-allocated explicit specifier. 1565 /// Whether this constructor is explicit specified. 1566 uint64_t IsSimpleExplicit : 1; 1567 }; 1568 1569 /// Number of non-inherited bits in CXXConstructorDeclBitfields. 1570 enum { 1571 NumCXXConstructorDeclBits = 64 - NumDeclContextBits - NumFunctionDeclBits 1572 }; 1573 1574 /// Stores the bits used by ObjCMethodDecl. 1575 /// If modified NumObjCMethodDeclBits and the accessor 1576 /// methods in ObjCMethodDecl should be updated appropriately. 1577 class ObjCMethodDeclBitfields { 1578 friend class ObjCMethodDecl; 1579 1580 /// For the bits in DeclContextBitfields. 1581 uint64_t : NumDeclContextBits; 1582 1583 /// The conventional meaning of this method; an ObjCMethodFamily. 1584 /// This is not serialized; instead, it is computed on demand and 1585 /// cached. 1586 mutable uint64_t Family : ObjCMethodFamilyBitWidth; 1587 1588 /// instance (true) or class (false) method. 1589 uint64_t IsInstance : 1; 1590 uint64_t IsVariadic : 1; 1591 1592 /// True if this method is the getter or setter for an explicit property. 1593 uint64_t IsPropertyAccessor : 1; 1594 1595 /// True if this method is a synthesized property accessor stub. 1596 uint64_t IsSynthesizedAccessorStub : 1; 1597 1598 /// Method has a definition. 1599 uint64_t IsDefined : 1; 1600 1601 /// Method redeclaration in the same interface. 1602 uint64_t IsRedeclaration : 1; 1603 1604 /// Is redeclared in the same interface. 1605 mutable uint64_t HasRedeclaration : 1; 1606 1607 /// \@required/\@optional 1608 uint64_t DeclImplementation : 2; 1609 1610 /// in, inout, etc. 1611 uint64_t objcDeclQualifier : 7; 1612 1613 /// Indicates whether this method has a related result type. 1614 uint64_t RelatedResultType : 1; 1615 1616 /// Whether the locations of the selector identifiers are in a 1617 /// "standard" position, a enum SelectorLocationsKind. 1618 uint64_t SelLocsKind : 2; 1619 1620 /// Whether this method overrides any other in the class hierarchy. 1621 /// 1622 /// A method is said to override any method in the class's 1623 /// base classes, its protocols, or its categories' protocols, that has 1624 /// the same selector and is of the same kind (class or instance). 1625 /// A method in an implementation is not considered as overriding the same 1626 /// method in the interface or its categories. 1627 uint64_t IsOverriding : 1; 1628 1629 /// Indicates if the method was a definition but its body was skipped. 1630 uint64_t HasSkippedBody : 1; 1631 }; 1632 1633 /// Number of non-inherited bits in ObjCMethodDeclBitfields. 1634 enum { NumObjCMethodDeclBits = 24 }; 1635 1636 /// Stores the bits used by ObjCContainerDecl. 1637 /// If modified NumObjCContainerDeclBits and the accessor 1638 /// methods in ObjCContainerDecl should be updated appropriately. 1639 class ObjCContainerDeclBitfields { 1640 friend class ObjCContainerDecl; 1641 /// For the bits in DeclContextBitfields 1642 uint32_t : NumDeclContextBits; 1643 1644 // Not a bitfield but this saves space. 1645 // Note that ObjCContainerDeclBitfields is full. 1646 SourceLocation AtStart; 1647 }; 1648 1649 /// Number of non-inherited bits in ObjCContainerDeclBitfields. 1650 /// Note that here we rely on the fact that SourceLocation is 32 bits 1651 /// wide. We check this with the static_assert in the ctor of DeclContext. 1652 enum { NumObjCContainerDeclBits = 64 - NumDeclContextBits }; 1653 1654 /// Stores the bits used by LinkageSpecDecl. 1655 /// If modified NumLinkageSpecDeclBits and the accessor 1656 /// methods in LinkageSpecDecl should be updated appropriately. 1657 class LinkageSpecDeclBitfields { 1658 friend class LinkageSpecDecl; 1659 /// For the bits in DeclContextBitfields. 1660 uint64_t : NumDeclContextBits; 1661 1662 /// The language for this linkage specification with values 1663 /// in the enum LinkageSpecDecl::LanguageIDs. 1664 uint64_t Language : 3; 1665 1666 /// True if this linkage spec has braces. 1667 /// This is needed so that hasBraces() returns the correct result while the 1668 /// linkage spec body is being parsed. Once RBraceLoc has been set this is 1669 /// not used, so it doesn't need to be serialized. 1670 uint64_t HasBraces : 1; 1671 }; 1672 1673 /// Number of non-inherited bits in LinkageSpecDeclBitfields. 1674 enum { NumLinkageSpecDeclBits = 4 }; 1675 1676 /// Stores the bits used by BlockDecl. 1677 /// If modified NumBlockDeclBits and the accessor 1678 /// methods in BlockDecl should be updated appropriately. 1679 class BlockDeclBitfields { 1680 friend class BlockDecl; 1681 /// For the bits in DeclContextBitfields. 1682 uint64_t : NumDeclContextBits; 1683 1684 uint64_t IsVariadic : 1; 1685 uint64_t CapturesCXXThis : 1; 1686 uint64_t BlockMissingReturnType : 1; 1687 uint64_t IsConversionFromLambda : 1; 1688 1689 /// A bit that indicates this block is passed directly to a function as a 1690 /// non-escaping parameter. 1691 uint64_t DoesNotEscape : 1; 1692 1693 /// A bit that indicates whether it's possible to avoid coying this block to 1694 /// the heap when it initializes or is assigned to a local variable with 1695 /// automatic storage. 1696 uint64_t CanAvoidCopyToHeap : 1; 1697 }; 1698 1699 /// Number of non-inherited bits in BlockDeclBitfields. 1700 enum { NumBlockDeclBits = 5 }; 1701 1702 /// Pointer to the data structure used to lookup declarations 1703 /// within this context (or a DependentStoredDeclsMap if this is a 1704 /// dependent context). We maintain the invariant that, if the map 1705 /// contains an entry for a DeclarationName (and we haven't lazily 1706 /// omitted anything), then it contains all relevant entries for that 1707 /// name (modulo the hasExternalDecls() flag). 1708 mutable StoredDeclsMap *LookupPtr = nullptr; 1709 1710protected: 1711 /// This anonymous union stores the bits belonging to DeclContext and classes 1712 /// deriving from it. The goal is to use otherwise wasted 1713 /// space in DeclContext to store data belonging to derived classes. 1714 /// The space saved is especially significient when pointers are aligned 1715 /// to 8 bytes. In this case due to alignment requirements we have a 1716 /// little less than 8 bytes free in DeclContext which we can use. 1717 /// We check that none of the classes in this union is larger than 1718 /// 8 bytes with static_asserts in the ctor of DeclContext. 1719 union { 1720 DeclContextBitfields DeclContextBits; 1721 TagDeclBitfields TagDeclBits; 1722 EnumDeclBitfields EnumDeclBits; 1723 RecordDeclBitfields RecordDeclBits; 1724 OMPDeclareReductionDeclBitfields OMPDeclareReductionDeclBits; 1725 FunctionDeclBitfields FunctionDeclBits; 1726 CXXConstructorDeclBitfields CXXConstructorDeclBits; 1727 ObjCMethodDeclBitfields ObjCMethodDeclBits; 1728 ObjCContainerDeclBitfields ObjCContainerDeclBits; 1729 LinkageSpecDeclBitfields LinkageSpecDeclBits; 1730 BlockDeclBitfields BlockDeclBits; 1731 }; 1732 1733 static_assert(sizeof(DeclContextBitfields) <= 8, 1734 "DeclContextBitfields is larger than 8 bytes!"); 1735 static_assert(sizeof(TagDeclBitfields) <= 8, 1736 "TagDeclBitfields is larger than 8 bytes!"); 1737 static_assert(sizeof(EnumDeclBitfields) <= 8, 1738 "EnumDeclBitfields is larger than 8 bytes!"); 1739 static_assert(sizeof(RecordDeclBitfields) <= 8, 1740 "RecordDeclBitfields is larger than 8 bytes!"); 1741 static_assert(sizeof(OMPDeclareReductionDeclBitfields) <= 8, 1742 "OMPDeclareReductionDeclBitfields is larger than 8 bytes!"); 1743 static_assert(sizeof(FunctionDeclBitfields) <= 8, 1744 "FunctionDeclBitfields is larger than 8 bytes!"); 1745 static_assert(sizeof(CXXConstructorDeclBitfields) <= 8, 1746 "CXXConstructorDeclBitfields is larger than 8 bytes!"); 1747 static_assert(sizeof(ObjCMethodDeclBitfields) <= 8, 1748 "ObjCMethodDeclBitfields is larger than 8 bytes!"); 1749 static_assert(sizeof(ObjCContainerDeclBitfields) <= 8, 1750 "ObjCContainerDeclBitfields is larger than 8 bytes!"); 1751 static_assert(sizeof(LinkageSpecDeclBitfields) <= 8, 1752 "LinkageSpecDeclBitfields is larger than 8 bytes!"); 1753 static_assert(sizeof(BlockDeclBitfields) <= 8, 1754 "BlockDeclBitfields is larger than 8 bytes!"); 1755 1756 /// FirstDecl - The first declaration stored within this declaration 1757 /// context. 1758 mutable Decl *FirstDecl = nullptr; 1759 1760 /// LastDecl - The last declaration stored within this declaration 1761 /// context. FIXME: We could probably cache this value somewhere 1762 /// outside of the DeclContext, to reduce the size of DeclContext by 1763 /// another pointer. 1764 mutable Decl *LastDecl = nullptr; 1765 1766 /// Build up a chain of declarations. 1767 /// 1768 /// \returns the first/last pair of declarations. 1769 static std::pair<Decl *, Decl *> 1770 BuildDeclChain(ArrayRef<Decl*> Decls, bool FieldsAlreadyLoaded); 1771 1772 DeclContext(Decl::Kind K); 1773 1774public: 1775 ~DeclContext(); 1776 1777 Decl::Kind getDeclKind() const { 1778 return static_cast<Decl::Kind>(DeclContextBits.DeclKind); 1779 } 1780 1781 const char *getDeclKindName() const; 1782 1783 /// getParent - Returns the containing DeclContext. 1784 DeclContext *getParent() { 1785 return cast<Decl>(this)->getDeclContext(); 1786 } 1787 const DeclContext *getParent() const { 1788 return const_cast<DeclContext*>(this)->getParent(); 1789 } 1790 1791 /// getLexicalParent - Returns the containing lexical DeclContext. May be 1792 /// different from getParent, e.g.: 1793 /// 1794 /// namespace A { 1795 /// struct S; 1796 /// } 1797 /// struct A::S {}; // getParent() == namespace 'A' 1798 /// // getLexicalParent() == translation unit 1799 /// 1800 DeclContext *getLexicalParent() { 1801 return cast<Decl>(this)->getLexicalDeclContext(); 1802 } 1803 const DeclContext *getLexicalParent() const { 1804 return const_cast<DeclContext*>(this)->getLexicalParent(); 1805 } 1806 1807 DeclContext *getLookupParent(); 1808 1809 const DeclContext *getLookupParent() const { 1810 return const_cast<DeclContext*>(this)->getLookupParent(); 1811 } 1812 1813 ASTContext &getParentASTContext() const { 1814 return cast<Decl>(this)->getASTContext(); 1815 } 1816 1817 bool isClosure() const { return getDeclKind() == Decl::Block; } 1818 1819 /// Return this DeclContext if it is a BlockDecl. Otherwise, return the 1820 /// innermost enclosing BlockDecl or null if there are no enclosing blocks. 1821 const BlockDecl *getInnermostBlockDecl() const; 1822 1823 bool isObjCContainer() const { 1824 switch (getDeclKind()) { 1825 case Decl::ObjCCategory: 1826 case Decl::ObjCCategoryImpl: 1827 case Decl::ObjCImplementation: 1828 case Decl::ObjCInterface: 1829 case Decl::ObjCProtocol: 1830 return true; 1831 default: 1832 return false; 1833 } 1834 } 1835 1836 bool isFunctionOrMethod() const { 1837 switch (getDeclKind()) { 1838 case Decl::Block: 1839 case Decl::Captured: 1840 case Decl::ObjCMethod: 1841 return true; 1842 default: 1843 return getDeclKind() >= Decl::firstFunction && 1844 getDeclKind() <= Decl::lastFunction; 1845 } 1846 } 1847 1848 /// Test whether the context supports looking up names. 1849 bool isLookupContext() const { 1850 return !isFunctionOrMethod() && getDeclKind() != Decl::LinkageSpec && 1851 getDeclKind() != Decl::Export; 1852 } 1853 1854 bool isFileContext() const { 1855 return getDeclKind() == Decl::TranslationUnit || 1856 getDeclKind() == Decl::Namespace; 1857 } 1858 1859 bool isTranslationUnit() const { 1860 return getDeclKind() == Decl::TranslationUnit; 1861 } 1862 1863 bool isRecord() const { 1864 return getDeclKind() >= Decl::firstRecord && 1865 getDeclKind() <= Decl::lastRecord; 1866 } 1867 1868 bool isNamespace() const { return getDeclKind() == Decl::Namespace; } 1869 1870 bool isStdNamespace() const; 1871 1872 bool isInlineNamespace() const; 1873 1874 /// Determines whether this context is dependent on a 1875 /// template parameter. 1876 bool isDependentContext() const; 1877 1878 /// isTransparentContext - Determines whether this context is a 1879 /// "transparent" context, meaning that the members declared in this 1880 /// context are semantically declared in the nearest enclosing 1881 /// non-transparent (opaque) context but are lexically declared in 1882 /// this context. For example, consider the enumerators of an 1883 /// enumeration type: 1884 /// @code 1885 /// enum E { 1886 /// Val1 1887 /// }; 1888 /// @endcode 1889 /// Here, E is a transparent context, so its enumerator (Val1) will 1890 /// appear (semantically) that it is in the same context of E. 1891 /// Examples of transparent contexts include: enumerations (except for 1892 /// C++0x scoped enums), and C++ linkage specifications. 1893 bool isTransparentContext() const; 1894 1895 /// Determines whether this context or some of its ancestors is a 1896 /// linkage specification context that specifies C linkage. 1897 bool isExternCContext() const; 1898 1899 /// Retrieve the nearest enclosing C linkage specification context. 1900 const LinkageSpecDecl *getExternCContext() const; 1901 1902 /// Determines whether this context or some of its ancestors is a 1903 /// linkage specification context that specifies C++ linkage. 1904 bool isExternCXXContext() const; 1905 1906 /// Determine whether this declaration context is equivalent 1907 /// to the declaration context DC. 1908 bool Equals(const DeclContext *DC) const { 1909 return DC && this->getPrimaryContext() == DC->getPrimaryContext(); 1910 } 1911 1912 /// Determine whether this declaration context encloses the 1913 /// declaration context DC. 1914 bool Encloses(const DeclContext *DC) const; 1915 1916 /// Find the nearest non-closure ancestor of this context, 1917 /// i.e. the innermost semantic parent of this context which is not 1918 /// a closure. A context may be its own non-closure ancestor. 1919 Decl *getNonClosureAncestor(); 1920 const Decl *getNonClosureAncestor() const { 1921 return const_cast<DeclContext*>(this)->getNonClosureAncestor(); 1922 } 1923 1924 /// getPrimaryContext - There may be many different 1925 /// declarations of the same entity (including forward declarations 1926 /// of classes, multiple definitions of namespaces, etc.), each with 1927 /// a different set of declarations. This routine returns the 1928 /// "primary" DeclContext structure, which will contain the 1929 /// information needed to perform name lookup into this context. 1930 DeclContext *getPrimaryContext(); 1931 const DeclContext *getPrimaryContext() const { 1932 return const_cast<DeclContext*>(this)->getPrimaryContext(); 1933 } 1934 1935 /// getRedeclContext - Retrieve the context in which an entity conflicts with 1936 /// other entities of the same name, or where it is a redeclaration if the 1937 /// two entities are compatible. This skips through transparent contexts. 1938 DeclContext *getRedeclContext(); 1939 const DeclContext *getRedeclContext() const { 1940 return const_cast<DeclContext *>(this)->getRedeclContext(); 1941 } 1942 1943 /// Retrieve the nearest enclosing namespace context. 1944 DeclContext *getEnclosingNamespaceContext(); 1945 const DeclContext *getEnclosingNamespaceContext() const { 1946 return const_cast<DeclContext *>(this)->getEnclosingNamespaceContext(); 1947 } 1948 1949 /// Retrieve the outermost lexically enclosing record context. 1950 RecordDecl *getOuterLexicalRecordContext(); 1951 const RecordDecl *getOuterLexicalRecordContext() const { 1952 return const_cast<DeclContext *>(this)->getOuterLexicalRecordContext(); 1953 } 1954 1955 /// Test if this context is part of the enclosing namespace set of 1956 /// the context NS, as defined in C++0x [namespace.def]p9. If either context 1957 /// isn't a namespace, this is equivalent to Equals(). 1958 /// 1959 /// The enclosing namespace set of a namespace is the namespace and, if it is 1960 /// inline, its enclosing namespace, recursively. 1961 bool InEnclosingNamespaceSetOf(const DeclContext *NS) const; 1962 1963 /// Collects all of the declaration contexts that are semantically 1964 /// connected to this declaration context. 1965 /// 1966 /// For declaration contexts that have multiple semantically connected but 1967 /// syntactically distinct contexts, such as C++ namespaces, this routine 1968 /// retrieves the complete set of such declaration contexts in source order. 1969 /// For example, given: 1970 /// 1971 /// \code 1972 /// namespace N { 1973 /// int x; 1974 /// } 1975 /// namespace N { 1976 /// int y; 1977 /// } 1978 /// \endcode 1979 /// 1980 /// The \c Contexts parameter will contain both definitions of N. 1981 /// 1982 /// \param Contexts Will be cleared and set to the set of declaration 1983 /// contexts that are semanticaly connected to this declaration context, 1984 /// in source order, including this context (which may be the only result, 1985 /// for non-namespace contexts). 1986 void collectAllContexts(SmallVectorImpl<DeclContext *> &Contexts); 1987 1988 /// decl_iterator - Iterates through the declarations stored 1989 /// within this context. 1990 class decl_iterator { 1991 /// Current - The current declaration. 1992 Decl *Current = nullptr; 1993 1994 public: 1995 using value_type = Decl *; 1996 using reference = const value_type &; 1997 using pointer = const value_type *; 1998 using iterator_category = std::forward_iterator_tag; 1999 using difference_type = std::ptrdiff_t; 2000 2001 decl_iterator() = default; 2002 explicit decl_iterator(Decl *C) : Current(C) {} 2003 2004 reference operator*() const { return Current; } 2005 2006 // This doesn't meet the iterator requirements, but it's convenient 2007 value_type operator->() const { return Current; } 2008 2009 decl_iterator& operator++() { 2010 Current = Current->getNextDeclInContext(); 2011 return *this; 2012 } 2013 2014 decl_iterator operator++(int) { 2015 decl_iterator tmp(*this); 2016 ++(*this); 2017 return tmp; 2018 } 2019 2020 friend bool operator==(decl_iterator x, decl_iterator y) { 2021 return x.Current == y.Current; 2022 } 2023 2024 friend bool operator!=(decl_iterator x, decl_iterator y) { 2025 return x.Current != y.Current; 2026 } 2027 }; 2028 2029 using decl_range = llvm::iterator_range<decl_iterator>; 2030 2031 /// decls_begin/decls_end - Iterate over the declarations stored in 2032 /// this context. 2033 decl_range decls() const { return decl_range(decls_begin(), decls_end()); } 2034 decl_iterator decls_begin() const; 2035 decl_iterator decls_end() const { return decl_iterator(); } 2036 bool decls_empty() const; 2037 2038 /// noload_decls_begin/end - Iterate over the declarations stored in this 2039 /// context that are currently loaded; don't attempt to retrieve anything 2040 /// from an external source. 2041 decl_range noload_decls() const { 2042 return decl_range(noload_decls_begin(), noload_decls_end()); 2043 } 2044 decl_iterator noload_decls_begin() const { return decl_iterator(FirstDecl); } 2045 decl_iterator noload_decls_end() const { return decl_iterator(); } 2046 2047 /// specific_decl_iterator - Iterates over a subrange of 2048 /// declarations stored in a DeclContext, providing only those that 2049 /// are of type SpecificDecl (or a class derived from it). This 2050 /// iterator is used, for example, to provide iteration over just 2051 /// the fields within a RecordDecl (with SpecificDecl = FieldDecl). 2052 template<typename SpecificDecl> 2053 class specific_decl_iterator { 2054 /// Current - The current, underlying declaration iterator, which 2055 /// will either be NULL or will point to a declaration of 2056 /// type SpecificDecl. 2057 DeclContext::decl_iterator Current; 2058 2059 /// SkipToNextDecl - Advances the current position up to the next 2060 /// declaration of type SpecificDecl that also meets the criteria 2061 /// required by Acceptable. 2062 void SkipToNextDecl() { 2063 while (*Current && !isa<SpecificDecl>(*Current)) 2064 ++Current; 2065 } 2066 2067 public: 2068 using value_type = SpecificDecl *; 2069 // TODO: Add reference and pointer types (with some appropriate proxy type) 2070 // if we ever have a need for them. 2071 using reference = void; 2072 using pointer = void; 2073 using difference_type = 2074 std::iterator_traits<DeclContext::decl_iterator>::difference_type; 2075 using iterator_category = std::forward_iterator_tag; 2076 2077 specific_decl_iterator() = default; 2078 2079 /// specific_decl_iterator - Construct a new iterator over a 2080 /// subset of the declarations the range [C, 2081 /// end-of-declarations). If A is non-NULL, it is a pointer to a 2082 /// member function of SpecificDecl that should return true for 2083 /// all of the SpecificDecl instances that will be in the subset 2084 /// of iterators. For example, if you want Objective-C instance 2085 /// methods, SpecificDecl will be ObjCMethodDecl and A will be 2086 /// &ObjCMethodDecl::isInstanceMethod. 2087 explicit specific_decl_iterator(DeclContext::decl_iterator C) : Current(C) { 2088 SkipToNextDecl(); 2089 } 2090 2091 value_type operator*() const { return cast<SpecificDecl>(*Current); } 2092 2093 // This doesn't meet the iterator requirements, but it's convenient 2094 value_type operator->() const { return **this; } 2095 2096 specific_decl_iterator& operator++() { 2097 ++Current; 2098 SkipToNextDecl(); 2099 return *this; 2100 } 2101 2102 specific_decl_iterator operator++(int) { 2103 specific_decl_iterator tmp(*this); 2104 ++(*this); 2105 return tmp; 2106 } 2107 2108 friend bool operator==(const specific_decl_iterator& x, 2109 const specific_decl_iterator& y) { 2110 return x.Current == y.Current; 2111 } 2112 2113 friend bool operator!=(const specific_decl_iterator& x, 2114 const specific_decl_iterator& y) { 2115 return x.Current != y.Current; 2116 } 2117 }; 2118 2119 /// Iterates over a filtered subrange of declarations stored 2120 /// in a DeclContext. 2121 /// 2122 /// This iterator visits only those declarations that are of type 2123 /// SpecificDecl (or a class derived from it) and that meet some 2124 /// additional run-time criteria. This iterator is used, for 2125 /// example, to provide access to the instance methods within an 2126 /// Objective-C interface (with SpecificDecl = ObjCMethodDecl and 2127 /// Acceptable = ObjCMethodDecl::isInstanceMethod). 2128 template<typename SpecificDecl, bool (SpecificDecl::*Acceptable)() const> 2129 class filtered_decl_iterator { 2130 /// Current - The current, underlying declaration iterator, which 2131 /// will either be NULL or will point to a declaration of 2132 /// type SpecificDecl. 2133 DeclContext::decl_iterator Current; 2134 2135 /// SkipToNextDecl - Advances the current position up to the next 2136 /// declaration of type SpecificDecl that also meets the criteria 2137 /// required by Acceptable. 2138 void SkipToNextDecl() { 2139 while (*Current && 2140 (!isa<SpecificDecl>(*Current) || 2141 (Acceptable && !(cast<SpecificDecl>(*Current)->*Acceptable)()))) 2142 ++Current; 2143 } 2144 2145 public: 2146 using value_type = SpecificDecl *; 2147 // TODO: Add reference and pointer types (with some appropriate proxy type) 2148 // if we ever have a need for them. 2149 using reference = void; 2150 using pointer = void; 2151 using difference_type = 2152 std::iterator_traits<DeclContext::decl_iterator>::difference_type; 2153 using iterator_category = std::forward_iterator_tag; 2154 2155 filtered_decl_iterator() = default; 2156 2157 /// filtered_decl_iterator - Construct a new iterator over a 2158 /// subset of the declarations the range [C, 2159 /// end-of-declarations). If A is non-NULL, it is a pointer to a 2160 /// member function of SpecificDecl that should return true for 2161 /// all of the SpecificDecl instances that will be in the subset 2162 /// of iterators. For example, if you want Objective-C instance 2163 /// methods, SpecificDecl will be ObjCMethodDecl and A will be 2164 /// &ObjCMethodDecl::isInstanceMethod. 2165 explicit filtered_decl_iterator(DeclContext::decl_iterator C) : Current(C) { 2166 SkipToNextDecl(); 2167 } 2168 2169 value_type operator*() const { return cast<SpecificDecl>(*Current); } 2170 value_type operator->() const { return cast<SpecificDecl>(*Current); } 2171 2172 filtered_decl_iterator& operator++() { 2173 ++Current; 2174 SkipToNextDecl(); 2175 return *this; 2176 } 2177 2178 filtered_decl_iterator operator++(int) { 2179 filtered_decl_iterator tmp(*this); 2180 ++(*this); 2181 return tmp; 2182 } 2183 2184 friend bool operator==(const filtered_decl_iterator& x, 2185 const filtered_decl_iterator& y) { 2186 return x.Current == y.Current; 2187 } 2188 2189 friend bool operator!=(const filtered_decl_iterator& x, 2190 const filtered_decl_iterator& y) { 2191 return x.Current != y.Current; 2192 } 2193 }; 2194 2195 /// Add the declaration D into this context. 2196 /// 2197 /// This routine should be invoked when the declaration D has first 2198 /// been declared, to place D into the context where it was 2199 /// (lexically) defined. Every declaration must be added to one 2200 /// (and only one!) context, where it can be visited via 2201 /// [decls_begin(), decls_end()). Once a declaration has been added 2202 /// to its lexical context, the corresponding DeclContext owns the 2203 /// declaration. 2204 /// 2205 /// If D is also a NamedDecl, it will be made visible within its 2206 /// semantic context via makeDeclVisibleInContext. 2207 void addDecl(Decl *D); 2208 2209 /// Add the declaration D into this context, but suppress 2210 /// searches for external declarations with the same name. 2211 /// 2212 /// Although analogous in function to addDecl, this removes an 2213 /// important check. This is only useful if the Decl is being 2214 /// added in response to an external search; in all other cases, 2215 /// addDecl() is the right function to use. 2216 /// See the ASTImporter for use cases. 2217 void addDeclInternal(Decl *D); 2218 2219 /// Add the declaration D to this context without modifying 2220 /// any lookup tables. 2221 /// 2222 /// This is useful for some operations in dependent contexts where 2223 /// the semantic context might not be dependent; this basically 2224 /// only happens with friends. 2225 void addHiddenDecl(Decl *D); 2226 2227 /// Removes a declaration from this context. 2228 void removeDecl(Decl *D); 2229 2230 /// Checks whether a declaration is in this context. 2231 bool containsDecl(Decl *D) const; 2232 2233 /// Checks whether a declaration is in this context. 2234 /// This also loads the Decls from the external source before the check. 2235 bool containsDeclAndLoad(Decl *D) const; 2236 2237 using lookup_result = DeclContextLookupResult; 2238 using lookup_iterator = lookup_result::iterator; 2239 2240 /// lookup - Find the declarations (if any) with the given Name in 2241 /// this context. Returns a range of iterators that contains all of 2242 /// the declarations with this name, with object, function, member, 2243 /// and enumerator names preceding any tag name. Note that this 2244 /// routine will not look into parent contexts. 2245 lookup_result lookup(DeclarationName Name) const; 2246 2247 /// Find the declarations with the given name that are visible 2248 /// within this context; don't attempt to retrieve anything from an 2249 /// external source. 2250 lookup_result noload_lookup(DeclarationName Name); 2251 2252 /// A simplistic name lookup mechanism that performs name lookup 2253 /// into this declaration context without consulting the external source. 2254 /// 2255 /// This function should almost never be used, because it subverts the 2256 /// usual relationship between a DeclContext and the external source. 2257 /// See the ASTImporter for the (few, but important) use cases. 2258 /// 2259 /// FIXME: This is very inefficient; replace uses of it with uses of 2260 /// noload_lookup. 2261 void localUncachedLookup(DeclarationName Name, 2262 SmallVectorImpl<NamedDecl *> &Results); 2263 2264 /// Makes a declaration visible within this context. 2265 /// 2266 /// This routine makes the declaration D visible to name lookup 2267 /// within this context and, if this is a transparent context, 2268 /// within its parent contexts up to the first enclosing 2269 /// non-transparent context. Making a declaration visible within a 2270 /// context does not transfer ownership of a declaration, and a 2271 /// declaration can be visible in many contexts that aren't its 2272 /// lexical context. 2273 /// 2274 /// If D is a redeclaration of an existing declaration that is 2275 /// visible from this context, as determined by 2276 /// NamedDecl::declarationReplaces, the previous declaration will be 2277 /// replaced with D. 2278 void makeDeclVisibleInContext(NamedDecl *D); 2279 2280 /// all_lookups_iterator - An iterator that provides a view over the results 2281 /// of looking up every possible name. 2282 class all_lookups_iterator; 2283 2284 using lookups_range = llvm::iterator_range<all_lookups_iterator>; 2285 2286 lookups_range lookups() const; 2287 // Like lookups(), but avoids loading external declarations. 2288 // If PreserveInternalState, avoids building lookup data structures too. 2289 lookups_range noload_lookups(bool PreserveInternalState) const; 2290 2291 /// Iterators over all possible lookups within this context. 2292 all_lookups_iterator lookups_begin() const; 2293 all_lookups_iterator lookups_end() const; 2294 2295 /// Iterators over all possible lookups within this context that are 2296 /// currently loaded; don't attempt to retrieve anything from an external 2297 /// source. 2298 all_lookups_iterator noload_lookups_begin() const; 2299 all_lookups_iterator noload_lookups_end() const; 2300 2301 struct udir_iterator; 2302 2303 using udir_iterator_base = 2304 llvm::iterator_adaptor_base<udir_iterator, lookup_iterator, 2305 std::random_access_iterator_tag, 2306 UsingDirectiveDecl *>; 2307 2308 struct udir_iterator : udir_iterator_base { 2309 udir_iterator(lookup_iterator I) : udir_iterator_base(I) {} 2310 2311 UsingDirectiveDecl *operator*() const; 2312 }; 2313 2314 using udir_range = llvm::iterator_range<udir_iterator>; 2315 2316 udir_range using_directives() const; 2317 2318 // These are all defined in DependentDiagnostic.h. 2319 class ddiag_iterator; 2320 2321 using ddiag_range = llvm::iterator_range<DeclContext::ddiag_iterator>; 2322 2323 inline ddiag_range ddiags() const; 2324 2325 // Low-level accessors 2326 2327 /// Mark that there are external lexical declarations that we need 2328 /// to include in our lookup table (and that are not available as external 2329 /// visible lookups). These extra lookup results will be found by walking 2330 /// the lexical declarations of this context. This should be used only if 2331 /// setHasExternalLexicalStorage() has been called on any decl context for 2332 /// which this is the primary context. 2333 void setMustBuildLookupTable() { 2334 assert(this == getPrimaryContext() && 2335 "should only be called on primary context"); 2336 DeclContextBits.HasLazyExternalLexicalLookups = true; 2337 } 2338 2339 /// Retrieve the internal representation of the lookup structure. 2340 /// This may omit some names if we are lazily building the structure. 2341 StoredDeclsMap *getLookupPtr() const { return LookupPtr; } 2342 2343 /// Ensure the lookup structure is fully-built and return it. 2344 StoredDeclsMap *buildLookup(); 2345 2346 /// Whether this DeclContext has external storage containing 2347 /// additional declarations that are lexically in this context. 2348 bool hasExternalLexicalStorage() const { 2349 return DeclContextBits.ExternalLexicalStorage; 2350 } 2351 2352 /// State whether this DeclContext has external storage for 2353 /// declarations lexically in this context. 2354 void setHasExternalLexicalStorage(bool ES = true) const { 2355 DeclContextBits.ExternalLexicalStorage = ES; 2356 } 2357 2358 /// Whether this DeclContext has external storage containing 2359 /// additional declarations that are visible in this context. 2360 bool hasExternalVisibleStorage() const { 2361 return DeclContextBits.ExternalVisibleStorage; 2362 } 2363 2364 /// State whether this DeclContext has external storage for 2365 /// declarations visible in this context. 2366 void setHasExternalVisibleStorage(bool ES = true) const { 2367 DeclContextBits.ExternalVisibleStorage = ES; 2368 if (ES && LookupPtr) 2369 DeclContextBits.NeedToReconcileExternalVisibleStorage = true; 2370 } 2371 2372 /// Determine whether the given declaration is stored in the list of 2373 /// declarations lexically within this context. 2374 bool isDeclInLexicalTraversal(const Decl *D) const { 2375 return D && (D->NextInContextAndBits.getPointer() || D == FirstDecl || 2376 D == LastDecl); 2377 } 2378 2379 bool setUseQualifiedLookup(bool use = true) const { 2380 bool old_value = DeclContextBits.UseQualifiedLookup; 2381 DeclContextBits.UseQualifiedLookup = use; 2382 return old_value; 2383 } 2384 2385 bool shouldUseQualifiedLookup() const { 2386 return DeclContextBits.UseQualifiedLookup; 2387 } 2388 2389 static bool classof(const Decl *D); 2390 static bool classof(const DeclContext *D) { return true; } 2391 2392 void dumpDeclContext() const; 2393 void dumpLookups() const; 2394 void dumpLookups(llvm::raw_ostream &OS, bool DumpDecls = false, 2395 bool Deserialize = false) const; 2396 2397private: 2398 /// Whether this declaration context has had externally visible 2399 /// storage added since the last lookup. In this case, \c LookupPtr's 2400 /// invariant may not hold and needs to be fixed before we perform 2401 /// another lookup. 2402 bool hasNeedToReconcileExternalVisibleStorage() const { 2403 return DeclContextBits.NeedToReconcileExternalVisibleStorage; 2404 } 2405 2406 /// State that this declaration context has had externally visible 2407 /// storage added since the last lookup. In this case, \c LookupPtr's 2408 /// invariant may not hold and needs to be fixed before we perform 2409 /// another lookup. 2410 void setNeedToReconcileExternalVisibleStorage(bool Need = true) const { 2411 DeclContextBits.NeedToReconcileExternalVisibleStorage = Need; 2412 } 2413 2414 /// If \c true, this context may have local lexical declarations 2415 /// that are missing from the lookup table. 2416 bool hasLazyLocalLexicalLookups() const { 2417 return DeclContextBits.HasLazyLocalLexicalLookups; 2418 } 2419 2420 /// If \c true, this context may have local lexical declarations 2421 /// that are missing from the lookup table. 2422 void setHasLazyLocalLexicalLookups(bool HasLLLL = true) const { 2423 DeclContextBits.HasLazyLocalLexicalLookups = HasLLLL; 2424 } 2425 2426 /// If \c true, the external source may have lexical declarations 2427 /// that are missing from the lookup table. 2428 bool hasLazyExternalLexicalLookups() const { 2429 return DeclContextBits.HasLazyExternalLexicalLookups; 2430 } 2431 2432 /// If \c true, the external source may have lexical declarations 2433 /// that are missing from the lookup table. 2434 void setHasLazyExternalLexicalLookups(bool HasLELL = true) const { 2435 DeclContextBits.HasLazyExternalLexicalLookups = HasLELL; 2436 } 2437 2438 void reconcileExternalVisibleStorage() const; 2439 bool LoadLexicalDeclsFromExternalStorage() const; 2440 2441 /// Makes a declaration visible within this context, but 2442 /// suppresses searches for external declarations with the same 2443 /// name. 2444 /// 2445 /// Analogous to makeDeclVisibleInContext, but for the exclusive 2446 /// use of addDeclInternal(). 2447 void makeDeclVisibleInContextInternal(NamedDecl *D); 2448 2449 StoredDeclsMap *CreateStoredDeclsMap(ASTContext &C) const; 2450 2451 void loadLazyLocalLexicalLookups(); 2452 void buildLookupImpl(DeclContext *DCtx, bool Internal); 2453 void makeDeclVisibleInContextWithFlags(NamedDecl *D, bool Internal, 2454 bool Rediscoverable); 2455 void makeDeclVisibleInContextImpl(NamedDecl *D, bool Internal); 2456}; 2457 2458inline bool Decl::isTemplateParameter() const { 2459 return getKind() == TemplateTypeParm || getKind() == NonTypeTemplateParm || 2460 getKind() == TemplateTemplateParm; 2461} 2462 2463// Specialization selected when ToTy is not a known subclass of DeclContext. 2464template <class ToTy, 2465 bool IsKnownSubtype = ::std::is_base_of<DeclContext, ToTy>::value> 2466struct cast_convert_decl_context { 2467 static const ToTy *doit(const DeclContext *Val) { 2468 return static_cast<const ToTy*>(Decl::castFromDeclContext(Val)); 2469 } 2470 2471 static ToTy *doit(DeclContext *Val) { 2472 return static_cast<ToTy*>(Decl::castFromDeclContext(Val)); 2473 } 2474}; 2475 2476// Specialization selected when ToTy is a known subclass of DeclContext. 2477template <class ToTy> 2478struct cast_convert_decl_context<ToTy, true> { 2479 static const ToTy *doit(const DeclContext *Val) { 2480 return static_cast<const ToTy*>(Val); 2481 } 2482 2483 static ToTy *doit(DeclContext *Val) { 2484 return static_cast<ToTy*>(Val); 2485 } 2486}; 2487 2488} // namespace clang 2489 2490namespace llvm { 2491 2492/// isa<T>(DeclContext*) 2493template <typename To> 2494struct isa_impl<To, ::clang::DeclContext> { 2495 static bool doit(const ::clang::DeclContext &Val) { 2496 return To::classofKind(Val.getDeclKind()); 2497 } 2498}; 2499 2500/// cast<T>(DeclContext*) 2501template<class ToTy> 2502struct cast_convert_val<ToTy, 2503 const ::clang::DeclContext,const ::clang::DeclContext> { 2504 static const ToTy &doit(const ::clang::DeclContext &Val) { 2505 return *::clang::cast_convert_decl_context<ToTy>::doit(&Val); 2506 } 2507}; 2508 2509template<class ToTy> 2510struct cast_convert_val<ToTy, ::clang::DeclContext, ::clang::DeclContext> { 2511 static ToTy &doit(::clang::DeclContext &Val) { 2512 return *::clang::cast_convert_decl_context<ToTy>::doit(&Val); 2513 } 2514}; 2515 2516template<class ToTy> 2517struct cast_convert_val<ToTy, 2518 const ::clang::DeclContext*, const ::clang::DeclContext*> { 2519 static const ToTy *doit(const ::clang::DeclContext *Val) { 2520 return ::clang::cast_convert_decl_context<ToTy>::doit(Val); 2521 } 2522}; 2523 2524template<class ToTy> 2525struct cast_convert_val<ToTy, ::clang::DeclContext*, ::clang::DeclContext*> { 2526 static ToTy *doit(::clang::DeclContext *Val) { 2527 return ::clang::cast_convert_decl_context<ToTy>::doit(Val); 2528 } 2529}; 2530 2531/// Implement cast_convert_val for Decl -> DeclContext conversions. 2532template<class FromTy> 2533struct cast_convert_val< ::clang::DeclContext, FromTy, FromTy> { 2534 static ::clang::DeclContext &doit(const FromTy &Val) { 2535 return *FromTy::castToDeclContext(&Val); 2536 } 2537}; 2538 2539template<class FromTy> 2540struct cast_convert_val< ::clang::DeclContext, FromTy*, FromTy*> { 2541 static ::clang::DeclContext *doit(const FromTy *Val) { 2542 return FromTy::castToDeclContext(Val); 2543 } 2544}; 2545 2546template<class FromTy> 2547struct cast_convert_val< const ::clang::DeclContext, FromTy, FromTy> { 2548 static const ::clang::DeclContext &doit(const FromTy &Val) { 2549 return *FromTy::castToDeclContext(&Val); 2550 } 2551}; 2552 2553template<class FromTy> 2554struct cast_convert_val< const ::clang::DeclContext, FromTy*, FromTy*> { 2555 static const ::clang::DeclContext *doit(const FromTy *Val) { 2556 return FromTy::castToDeclContext(Val); 2557 } 2558}; 2559 2560} // namespace llvm 2561 2562#endif // LLVM_CLANG_AST_DECLBASE_H 2563