1 //===- DeclCXX.h - Classes for representing C++ 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 /// \file 10 /// Defines the C++ Decl subclasses, other than those for templates 11 /// (found in DeclTemplate.h) and friends (in DeclFriend.h). 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_CLANG_AST_DECLCXX_H 16 #define LLVM_CLANG_AST_DECLCXX_H 17 18 #include "clang/AST/ASTUnresolvedSet.h" 19 #include "clang/AST/Decl.h" 20 #include "clang/AST/DeclBase.h" 21 #include "clang/AST/DeclarationName.h" 22 #include "clang/AST/Expr.h" 23 #include "clang/AST/ExternalASTSource.h" 24 #include "clang/AST/LambdaCapture.h" 25 #include "clang/AST/NestedNameSpecifier.h" 26 #include "clang/AST/Redeclarable.h" 27 #include "clang/AST/Stmt.h" 28 #include "clang/AST/Type.h" 29 #include "clang/AST/TypeLoc.h" 30 #include "clang/AST/UnresolvedSet.h" 31 #include "clang/Basic/LLVM.h" 32 #include "clang/Basic/Lambda.h" 33 #include "clang/Basic/LangOptions.h" 34 #include "clang/Basic/OperatorKinds.h" 35 #include "clang/Basic/SourceLocation.h" 36 #include "clang/Basic/Specifiers.h" 37 #include "llvm/ADT/ArrayRef.h" 38 #include "llvm/ADT/DenseMap.h" 39 #include "llvm/ADT/PointerIntPair.h" 40 #include "llvm/ADT/PointerUnion.h" 41 #include "llvm/ADT/STLExtras.h" 42 #include "llvm/ADT/TinyPtrVector.h" 43 #include "llvm/ADT/iterator_range.h" 44 #include "llvm/Support/Casting.h" 45 #include "llvm/Support/Compiler.h" 46 #include "llvm/Support/PointerLikeTypeTraits.h" 47 #include "llvm/Support/TrailingObjects.h" 48 #include <cassert> 49 #include <cstddef> 50 #include <iterator> 51 #include <memory> 52 #include <vector> 53 54 namespace clang { 55 56 class ASTContext; 57 class ClassTemplateDecl; 58 class ConstructorUsingShadowDecl; 59 class CXXBasePath; 60 class CXXBasePaths; 61 class CXXConstructorDecl; 62 class CXXDestructorDecl; 63 class CXXFinalOverriderMap; 64 class CXXIndirectPrimaryBaseSet; 65 class CXXMethodDecl; 66 class DecompositionDecl; 67 class DiagnosticBuilder; 68 class FriendDecl; 69 class FunctionTemplateDecl; 70 class IdentifierInfo; 71 class MemberSpecializationInfo; 72 class BaseUsingDecl; 73 class TemplateDecl; 74 class TemplateParameterList; 75 class UsingDecl; 76 77 /// Represents an access specifier followed by colon ':'. 78 /// 79 /// An objects of this class represents sugar for the syntactic occurrence 80 /// of an access specifier followed by a colon in the list of member 81 /// specifiers of a C++ class definition. 82 /// 83 /// Note that they do not represent other uses of access specifiers, 84 /// such as those occurring in a list of base specifiers. 85 /// Also note that this class has nothing to do with so-called 86 /// "access declarations" (C++98 11.3 [class.access.dcl]). 87 class AccessSpecDecl : public Decl { 88 /// The location of the ':'. 89 SourceLocation ColonLoc; 90 AccessSpecDecl(AccessSpecifier AS,DeclContext * DC,SourceLocation ASLoc,SourceLocation ColonLoc)91 AccessSpecDecl(AccessSpecifier AS, DeclContext *DC, 92 SourceLocation ASLoc, SourceLocation ColonLoc) 93 : Decl(AccessSpec, DC, ASLoc), ColonLoc(ColonLoc) { 94 setAccess(AS); 95 } 96 AccessSpecDecl(EmptyShell Empty)97 AccessSpecDecl(EmptyShell Empty) : Decl(AccessSpec, Empty) {} 98 99 virtual void anchor(); 100 101 public: 102 /// The location of the access specifier. getAccessSpecifierLoc()103 SourceLocation getAccessSpecifierLoc() const { return getLocation(); } 104 105 /// Sets the location of the access specifier. setAccessSpecifierLoc(SourceLocation ASLoc)106 void setAccessSpecifierLoc(SourceLocation ASLoc) { setLocation(ASLoc); } 107 108 /// The location of the colon following the access specifier. getColonLoc()109 SourceLocation getColonLoc() const { return ColonLoc; } 110 111 /// Sets the location of the colon. setColonLoc(SourceLocation CLoc)112 void setColonLoc(SourceLocation CLoc) { ColonLoc = CLoc; } 113 getSourceRange()114 SourceRange getSourceRange() const override LLVM_READONLY { 115 return SourceRange(getAccessSpecifierLoc(), getColonLoc()); 116 } 117 Create(ASTContext & C,AccessSpecifier AS,DeclContext * DC,SourceLocation ASLoc,SourceLocation ColonLoc)118 static AccessSpecDecl *Create(ASTContext &C, AccessSpecifier AS, 119 DeclContext *DC, SourceLocation ASLoc, 120 SourceLocation ColonLoc) { 121 return new (C, DC) AccessSpecDecl(AS, DC, ASLoc, ColonLoc); 122 } 123 124 static AccessSpecDecl *CreateDeserialized(ASTContext &C, unsigned ID); 125 126 // Implement isa/cast/dyncast/etc. classof(const Decl * D)127 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)128 static bool classofKind(Kind K) { return K == AccessSpec; } 129 }; 130 131 /// Represents a base class of a C++ class. 132 /// 133 /// Each CXXBaseSpecifier represents a single, direct base class (or 134 /// struct) of a C++ class (or struct). It specifies the type of that 135 /// base class, whether it is a virtual or non-virtual base, and what 136 /// level of access (public, protected, private) is used for the 137 /// derivation. For example: 138 /// 139 /// \code 140 /// class A { }; 141 /// class B { }; 142 /// class C : public virtual A, protected B { }; 143 /// \endcode 144 /// 145 /// In this code, C will have two CXXBaseSpecifiers, one for "public 146 /// virtual A" and the other for "protected B". 147 class CXXBaseSpecifier { 148 /// The source code range that covers the full base 149 /// specifier, including the "virtual" (if present) and access 150 /// specifier (if present). 151 SourceRange Range; 152 153 /// The source location of the ellipsis, if this is a pack 154 /// expansion. 155 SourceLocation EllipsisLoc; 156 157 /// Whether this is a virtual base class or not. 158 unsigned Virtual : 1; 159 160 /// Whether this is the base of a class (true) or of a struct (false). 161 /// 162 /// This determines the mapping from the access specifier as written in the 163 /// source code to the access specifier used for semantic analysis. 164 unsigned BaseOfClass : 1; 165 166 /// Access specifier as written in the source code (may be AS_none). 167 /// 168 /// The actual type of data stored here is an AccessSpecifier, but we use 169 /// "unsigned" here to work around a VC++ bug. 170 unsigned Access : 2; 171 172 /// Whether the class contains a using declaration 173 /// to inherit the named class's constructors. 174 unsigned InheritConstructors : 1; 175 176 /// The type of the base class. 177 /// 178 /// This will be a class or struct (or a typedef of such). The source code 179 /// range does not include the \c virtual or the access specifier. 180 TypeSourceInfo *BaseTypeInfo; 181 182 public: 183 CXXBaseSpecifier() = default; CXXBaseSpecifier(SourceRange R,bool V,bool BC,AccessSpecifier A,TypeSourceInfo * TInfo,SourceLocation EllipsisLoc)184 CXXBaseSpecifier(SourceRange R, bool V, bool BC, AccessSpecifier A, 185 TypeSourceInfo *TInfo, SourceLocation EllipsisLoc) 186 : Range(R), EllipsisLoc(EllipsisLoc), Virtual(V), BaseOfClass(BC), 187 Access(A), InheritConstructors(false), BaseTypeInfo(TInfo) {} 188 189 /// Retrieves the source range that contains the entire base specifier. getSourceRange()190 SourceRange getSourceRange() const LLVM_READONLY { return Range; } getBeginLoc()191 SourceLocation getBeginLoc() const LLVM_READONLY { return Range.getBegin(); } getEndLoc()192 SourceLocation getEndLoc() const LLVM_READONLY { return Range.getEnd(); } 193 194 /// Get the location at which the base class type was written. getBaseTypeLoc()195 SourceLocation getBaseTypeLoc() const LLVM_READONLY { 196 return BaseTypeInfo->getTypeLoc().getBeginLoc(); 197 } 198 199 /// Determines whether the base class is a virtual base class (or not). isVirtual()200 bool isVirtual() const { return Virtual; } 201 202 /// Determine whether this base class is a base of a class declared 203 /// with the 'class' keyword (vs. one declared with the 'struct' keyword). isBaseOfClass()204 bool isBaseOfClass() const { return BaseOfClass; } 205 206 /// Determine whether this base specifier is a pack expansion. isPackExpansion()207 bool isPackExpansion() const { return EllipsisLoc.isValid(); } 208 209 /// Determine whether this base class's constructors get inherited. getInheritConstructors()210 bool getInheritConstructors() const { return InheritConstructors; } 211 212 /// Set that this base class's constructors should be inherited. 213 void setInheritConstructors(bool Inherit = true) { 214 InheritConstructors = Inherit; 215 } 216 217 /// For a pack expansion, determine the location of the ellipsis. getEllipsisLoc()218 SourceLocation getEllipsisLoc() const { 219 return EllipsisLoc; 220 } 221 222 /// Returns the access specifier for this base specifier. 223 /// 224 /// This is the actual base specifier as used for semantic analysis, so 225 /// the result can never be AS_none. To retrieve the access specifier as 226 /// written in the source code, use getAccessSpecifierAsWritten(). getAccessSpecifier()227 AccessSpecifier getAccessSpecifier() const { 228 if ((AccessSpecifier)Access == AS_none) 229 return BaseOfClass? AS_private : AS_public; 230 else 231 return (AccessSpecifier)Access; 232 } 233 234 /// Retrieves the access specifier as written in the source code 235 /// (which may mean that no access specifier was explicitly written). 236 /// 237 /// Use getAccessSpecifier() to retrieve the access specifier for use in 238 /// semantic analysis. getAccessSpecifierAsWritten()239 AccessSpecifier getAccessSpecifierAsWritten() const { 240 return (AccessSpecifier)Access; 241 } 242 243 /// Retrieves the type of the base class. 244 /// 245 /// This type will always be an unqualified class type. getType()246 QualType getType() const { 247 return BaseTypeInfo->getType().getUnqualifiedType(); 248 } 249 250 /// Retrieves the type and source location of the base class. getTypeSourceInfo()251 TypeSourceInfo *getTypeSourceInfo() const { return BaseTypeInfo; } 252 }; 253 254 /// Represents a C++ struct/union/class. 255 class CXXRecordDecl : public RecordDecl { 256 friend class ASTDeclReader; 257 friend class ASTDeclWriter; 258 friend class ASTNodeImporter; 259 friend class ASTReader; 260 friend class ASTRecordWriter; 261 friend class ASTWriter; 262 friend class DeclContext; 263 friend class LambdaExpr; 264 265 friend void FunctionDecl::setPure(bool); 266 friend void TagDecl::startDefinition(); 267 268 /// Values used in DefinitionData fields to represent special members. 269 enum SpecialMemberFlags { 270 SMF_DefaultConstructor = 0x1, 271 SMF_CopyConstructor = 0x2, 272 SMF_MoveConstructor = 0x4, 273 SMF_CopyAssignment = 0x8, 274 SMF_MoveAssignment = 0x10, 275 SMF_Destructor = 0x20, 276 SMF_All = 0x3f 277 }; 278 279 struct DefinitionData { 280 #define FIELD(Name, Width, Merge) \ 281 unsigned Name : Width; 282 #include "CXXRecordDeclDefinitionBits.def" 283 284 /// Whether this class describes a C++ lambda. 285 unsigned IsLambda : 1; 286 287 /// Whether we are currently parsing base specifiers. 288 unsigned IsParsingBaseSpecifiers : 1; 289 290 /// True when visible conversion functions are already computed 291 /// and are available. 292 unsigned ComputedVisibleConversions : 1; 293 294 unsigned HasODRHash : 1; 295 296 /// A hash of parts of the class to help in ODR checking. 297 unsigned ODRHash = 0; 298 299 /// The number of base class specifiers in Bases. 300 unsigned NumBases = 0; 301 302 /// The number of virtual base class specifiers in VBases. 303 unsigned NumVBases = 0; 304 305 /// Base classes of this class. 306 /// 307 /// FIXME: This is wasted space for a union. 308 LazyCXXBaseSpecifiersPtr Bases; 309 310 /// direct and indirect virtual base classes of this class. 311 LazyCXXBaseSpecifiersPtr VBases; 312 313 /// The conversion functions of this C++ class (but not its 314 /// inherited conversion functions). 315 /// 316 /// Each of the entries in this overload set is a CXXConversionDecl. 317 LazyASTUnresolvedSet Conversions; 318 319 /// The conversion functions of this C++ class and all those 320 /// inherited conversion functions that are visible in this class. 321 /// 322 /// Each of the entries in this overload set is a CXXConversionDecl or a 323 /// FunctionTemplateDecl. 324 LazyASTUnresolvedSet VisibleConversions; 325 326 /// The declaration which defines this record. 327 CXXRecordDecl *Definition; 328 329 /// The first friend declaration in this class, or null if there 330 /// aren't any. 331 /// 332 /// This is actually currently stored in reverse order. 333 LazyDeclPtr FirstFriend; 334 335 DefinitionData(CXXRecordDecl *D); 336 337 /// Retrieve the set of direct base classes. getBasesDefinitionData338 CXXBaseSpecifier *getBases() const { 339 if (!Bases.isOffset()) 340 return Bases.get(nullptr); 341 return getBasesSlowCase(); 342 } 343 344 /// Retrieve the set of virtual base classes. getVBasesDefinitionData345 CXXBaseSpecifier *getVBases() const { 346 if (!VBases.isOffset()) 347 return VBases.get(nullptr); 348 return getVBasesSlowCase(); 349 } 350 basesDefinitionData351 ArrayRef<CXXBaseSpecifier> bases() const { 352 return llvm::makeArrayRef(getBases(), NumBases); 353 } 354 vbasesDefinitionData355 ArrayRef<CXXBaseSpecifier> vbases() const { 356 return llvm::makeArrayRef(getVBases(), NumVBases); 357 } 358 359 private: 360 CXXBaseSpecifier *getBasesSlowCase() const; 361 CXXBaseSpecifier *getVBasesSlowCase() const; 362 }; 363 364 struct DefinitionData *DefinitionData; 365 366 /// Describes a C++ closure type (generated by a lambda expression). 367 struct LambdaDefinitionData : public DefinitionData { 368 using Capture = LambdaCapture; 369 370 /// Whether this lambda is known to be dependent, even if its 371 /// context isn't dependent. 372 /// 373 /// A lambda with a non-dependent context can be dependent if it occurs 374 /// within the default argument of a function template, because the 375 /// lambda will have been created with the enclosing context as its 376 /// declaration context, rather than function. This is an unfortunate 377 /// artifact of having to parse the default arguments before. 378 unsigned Dependent : 1; 379 380 /// Whether this lambda is a generic lambda. 381 unsigned IsGenericLambda : 1; 382 383 /// The Default Capture. 384 unsigned CaptureDefault : 2; 385 386 /// The number of captures in this lambda is limited 2^NumCaptures. 387 unsigned NumCaptures : 15; 388 389 /// The number of explicit captures in this lambda. 390 unsigned NumExplicitCaptures : 13; 391 392 /// Has known `internal` linkage. 393 unsigned HasKnownInternalLinkage : 1; 394 395 /// The number used to indicate this lambda expression for name 396 /// mangling in the Itanium C++ ABI. 397 unsigned ManglingNumber : 31; 398 399 /// The declaration that provides context for this lambda, if the 400 /// actual DeclContext does not suffice. This is used for lambdas that 401 /// occur within default arguments of function parameters within the class 402 /// or within a data member initializer. 403 LazyDeclPtr ContextDecl; 404 405 /// The list of captures, both explicit and implicit, for this 406 /// lambda. 407 Capture *Captures = nullptr; 408 409 /// The type of the call method. 410 TypeSourceInfo *MethodTyInfo; 411 LambdaDefinitionDataLambdaDefinitionData412 LambdaDefinitionData(CXXRecordDecl *D, TypeSourceInfo *Info, bool Dependent, 413 bool IsGeneric, LambdaCaptureDefault CaptureDefault) 414 : DefinitionData(D), Dependent(Dependent), IsGenericLambda(IsGeneric), 415 CaptureDefault(CaptureDefault), NumCaptures(0), 416 NumExplicitCaptures(0), HasKnownInternalLinkage(0), ManglingNumber(0), 417 MethodTyInfo(Info) { 418 IsLambda = true; 419 420 // C++1z [expr.prim.lambda]p4: 421 // This class type is not an aggregate type. 422 Aggregate = false; 423 PlainOldData = false; 424 } 425 }; 426 dataPtr()427 struct DefinitionData *dataPtr() const { 428 // Complete the redecl chain (if necessary). 429 getMostRecentDecl(); 430 return DefinitionData; 431 } 432 data()433 struct DefinitionData &data() const { 434 auto *DD = dataPtr(); 435 assert(DD && "queried property of class with no definition"); 436 return *DD; 437 } 438 getLambdaData()439 struct LambdaDefinitionData &getLambdaData() const { 440 // No update required: a merged definition cannot change any lambda 441 // properties. 442 auto *DD = DefinitionData; 443 assert(DD && DD->IsLambda && "queried lambda property of non-lambda class"); 444 return static_cast<LambdaDefinitionData&>(*DD); 445 } 446 447 /// The template or declaration that this declaration 448 /// describes or was instantiated from, respectively. 449 /// 450 /// For non-templates, this value will be null. For record 451 /// declarations that describe a class template, this will be a 452 /// pointer to a ClassTemplateDecl. For member 453 /// classes of class template specializations, this will be the 454 /// MemberSpecializationInfo referring to the member class that was 455 /// instantiated or specialized. 456 llvm::PointerUnion<ClassTemplateDecl *, MemberSpecializationInfo *> 457 TemplateOrInstantiation; 458 459 /// Called from setBases and addedMember to notify the class that a 460 /// direct or virtual base class or a member of class type has been added. 461 void addedClassSubobject(CXXRecordDecl *Base); 462 463 /// Notify the class that member has been added. 464 /// 465 /// This routine helps maintain information about the class based on which 466 /// members have been added. It will be invoked by DeclContext::addDecl() 467 /// whenever a member is added to this record. 468 void addedMember(Decl *D); 469 470 void markedVirtualFunctionPure(); 471 472 /// Get the head of our list of friend declarations, possibly 473 /// deserializing the friends from an external AST source. 474 FriendDecl *getFirstFriend() const; 475 476 /// Determine whether this class has an empty base class subobject of type X 477 /// or of one of the types that might be at offset 0 within X (per the C++ 478 /// "standard layout" rules). 479 bool hasSubobjectAtOffsetZeroOfEmptyBaseType(ASTContext &Ctx, 480 const CXXRecordDecl *X); 481 482 protected: 483 CXXRecordDecl(Kind K, TagKind TK, const ASTContext &C, DeclContext *DC, 484 SourceLocation StartLoc, SourceLocation IdLoc, 485 IdentifierInfo *Id, CXXRecordDecl *PrevDecl); 486 487 public: 488 /// Iterator that traverses the base classes of a class. 489 using base_class_iterator = CXXBaseSpecifier *; 490 491 /// Iterator that traverses the base classes of a class. 492 using base_class_const_iterator = const CXXBaseSpecifier *; 493 getCanonicalDecl()494 CXXRecordDecl *getCanonicalDecl() override { 495 return cast<CXXRecordDecl>(RecordDecl::getCanonicalDecl()); 496 } 497 getCanonicalDecl()498 const CXXRecordDecl *getCanonicalDecl() const { 499 return const_cast<CXXRecordDecl*>(this)->getCanonicalDecl(); 500 } 501 getPreviousDecl()502 CXXRecordDecl *getPreviousDecl() { 503 return cast_or_null<CXXRecordDecl>( 504 static_cast<RecordDecl *>(this)->getPreviousDecl()); 505 } 506 getPreviousDecl()507 const CXXRecordDecl *getPreviousDecl() const { 508 return const_cast<CXXRecordDecl*>(this)->getPreviousDecl(); 509 } 510 getMostRecentDecl()511 CXXRecordDecl *getMostRecentDecl() { 512 return cast<CXXRecordDecl>( 513 static_cast<RecordDecl *>(this)->getMostRecentDecl()); 514 } 515 getMostRecentDecl()516 const CXXRecordDecl *getMostRecentDecl() const { 517 return const_cast<CXXRecordDecl*>(this)->getMostRecentDecl(); 518 } 519 getMostRecentNonInjectedDecl()520 CXXRecordDecl *getMostRecentNonInjectedDecl() { 521 CXXRecordDecl *Recent = 522 static_cast<CXXRecordDecl *>(this)->getMostRecentDecl(); 523 while (Recent->isInjectedClassName()) { 524 // FIXME: Does injected class name need to be in the redeclarations chain? 525 assert(Recent->getPreviousDecl()); 526 Recent = Recent->getPreviousDecl(); 527 } 528 return Recent; 529 } 530 getMostRecentNonInjectedDecl()531 const CXXRecordDecl *getMostRecentNonInjectedDecl() const { 532 return const_cast<CXXRecordDecl*>(this)->getMostRecentNonInjectedDecl(); 533 } 534 getDefinition()535 CXXRecordDecl *getDefinition() const { 536 // We only need an update if we don't already know which 537 // declaration is the definition. 538 auto *DD = DefinitionData ? DefinitionData : dataPtr(); 539 return DD ? DD->Definition : nullptr; 540 } 541 hasDefinition()542 bool hasDefinition() const { return DefinitionData || dataPtr(); } 543 544 static CXXRecordDecl *Create(const ASTContext &C, TagKind TK, DeclContext *DC, 545 SourceLocation StartLoc, SourceLocation IdLoc, 546 IdentifierInfo *Id, 547 CXXRecordDecl *PrevDecl = nullptr, 548 bool DelayTypeCreation = false); 549 static CXXRecordDecl *CreateLambda(const ASTContext &C, DeclContext *DC, 550 TypeSourceInfo *Info, SourceLocation Loc, 551 bool DependentLambda, bool IsGeneric, 552 LambdaCaptureDefault CaptureDefault); 553 static CXXRecordDecl *CreateDeserialized(const ASTContext &C, unsigned ID); 554 isDynamicClass()555 bool isDynamicClass() const { 556 return data().Polymorphic || data().NumVBases != 0; 557 } 558 559 /// @returns true if class is dynamic or might be dynamic because the 560 /// definition is incomplete of dependent. mayBeDynamicClass()561 bool mayBeDynamicClass() const { 562 return !hasDefinition() || isDynamicClass() || hasAnyDependentBases(); 563 } 564 565 /// @returns true if class is non dynamic or might be non dynamic because the 566 /// definition is incomplete of dependent. mayBeNonDynamicClass()567 bool mayBeNonDynamicClass() const { 568 return !hasDefinition() || !isDynamicClass() || hasAnyDependentBases(); 569 } 570 setIsParsingBaseSpecifiers()571 void setIsParsingBaseSpecifiers() { data().IsParsingBaseSpecifiers = true; } 572 isParsingBaseSpecifiers()573 bool isParsingBaseSpecifiers() const { 574 return data().IsParsingBaseSpecifiers; 575 } 576 577 unsigned getODRHash() const; 578 579 /// Sets the base classes of this struct or class. 580 void setBases(CXXBaseSpecifier const * const *Bases, unsigned NumBases); 581 582 /// Retrieves the number of base classes of this class. getNumBases()583 unsigned getNumBases() const { return data().NumBases; } 584 585 using base_class_range = llvm::iterator_range<base_class_iterator>; 586 using base_class_const_range = 587 llvm::iterator_range<base_class_const_iterator>; 588 bases()589 base_class_range bases() { 590 return base_class_range(bases_begin(), bases_end()); 591 } bases()592 base_class_const_range bases() const { 593 return base_class_const_range(bases_begin(), bases_end()); 594 } 595 bases_begin()596 base_class_iterator bases_begin() { return data().getBases(); } bases_begin()597 base_class_const_iterator bases_begin() const { return data().getBases(); } bases_end()598 base_class_iterator bases_end() { return bases_begin() + data().NumBases; } bases_end()599 base_class_const_iterator bases_end() const { 600 return bases_begin() + data().NumBases; 601 } 602 603 /// Retrieves the number of virtual base classes of this class. getNumVBases()604 unsigned getNumVBases() const { return data().NumVBases; } 605 vbases()606 base_class_range vbases() { 607 return base_class_range(vbases_begin(), vbases_end()); 608 } vbases()609 base_class_const_range vbases() const { 610 return base_class_const_range(vbases_begin(), vbases_end()); 611 } 612 vbases_begin()613 base_class_iterator vbases_begin() { return data().getVBases(); } vbases_begin()614 base_class_const_iterator vbases_begin() const { return data().getVBases(); } vbases_end()615 base_class_iterator vbases_end() { return vbases_begin() + data().NumVBases; } vbases_end()616 base_class_const_iterator vbases_end() const { 617 return vbases_begin() + data().NumVBases; 618 } 619 620 /// Determine whether this class has any dependent base classes which 621 /// are not the current instantiation. 622 bool hasAnyDependentBases() const; 623 624 /// Iterator access to method members. The method iterator visits 625 /// all method members of the class, including non-instance methods, 626 /// special methods, etc. 627 using method_iterator = specific_decl_iterator<CXXMethodDecl>; 628 using method_range = 629 llvm::iterator_range<specific_decl_iterator<CXXMethodDecl>>; 630 methods()631 method_range methods() const { 632 return method_range(method_begin(), method_end()); 633 } 634 635 /// Method begin iterator. Iterates in the order the methods 636 /// were declared. method_begin()637 method_iterator method_begin() const { 638 return method_iterator(decls_begin()); 639 } 640 641 /// Method past-the-end iterator. method_end()642 method_iterator method_end() const { 643 return method_iterator(decls_end()); 644 } 645 646 /// Iterator access to constructor members. 647 using ctor_iterator = specific_decl_iterator<CXXConstructorDecl>; 648 using ctor_range = 649 llvm::iterator_range<specific_decl_iterator<CXXConstructorDecl>>; 650 ctors()651 ctor_range ctors() const { return ctor_range(ctor_begin(), ctor_end()); } 652 ctor_begin()653 ctor_iterator ctor_begin() const { 654 return ctor_iterator(decls_begin()); 655 } 656 ctor_end()657 ctor_iterator ctor_end() const { 658 return ctor_iterator(decls_end()); 659 } 660 661 /// An iterator over friend declarations. All of these are defined 662 /// in DeclFriend.h. 663 class friend_iterator; 664 using friend_range = llvm::iterator_range<friend_iterator>; 665 666 friend_range friends() const; 667 friend_iterator friend_begin() const; 668 friend_iterator friend_end() const; 669 void pushFriendDecl(FriendDecl *FD); 670 671 /// Determines whether this record has any friends. hasFriends()672 bool hasFriends() const { 673 return data().FirstFriend.isValid(); 674 } 675 676 /// \c true if a defaulted copy constructor for this class would be 677 /// deleted. defaultedCopyConstructorIsDeleted()678 bool defaultedCopyConstructorIsDeleted() const { 679 assert((!needsOverloadResolutionForCopyConstructor() || 680 (data().DeclaredSpecialMembers & SMF_CopyConstructor)) && 681 "this property has not yet been computed by Sema"); 682 return data().DefaultedCopyConstructorIsDeleted; 683 } 684 685 /// \c true if a defaulted move constructor for this class would be 686 /// deleted. defaultedMoveConstructorIsDeleted()687 bool defaultedMoveConstructorIsDeleted() const { 688 assert((!needsOverloadResolutionForMoveConstructor() || 689 (data().DeclaredSpecialMembers & SMF_MoveConstructor)) && 690 "this property has not yet been computed by Sema"); 691 return data().DefaultedMoveConstructorIsDeleted; 692 } 693 694 /// \c true if a defaulted destructor for this class would be deleted. defaultedDestructorIsDeleted()695 bool defaultedDestructorIsDeleted() const { 696 assert((!needsOverloadResolutionForDestructor() || 697 (data().DeclaredSpecialMembers & SMF_Destructor)) && 698 "this property has not yet been computed by Sema"); 699 return data().DefaultedDestructorIsDeleted; 700 } 701 702 /// \c true if we know for sure that this class has a single, 703 /// accessible, unambiguous copy constructor that is not deleted. hasSimpleCopyConstructor()704 bool hasSimpleCopyConstructor() const { 705 return !hasUserDeclaredCopyConstructor() && 706 !data().DefaultedCopyConstructorIsDeleted; 707 } 708 709 /// \c true if we know for sure that this class has a single, 710 /// accessible, unambiguous move constructor that is not deleted. hasSimpleMoveConstructor()711 bool hasSimpleMoveConstructor() const { 712 return !hasUserDeclaredMoveConstructor() && hasMoveConstructor() && 713 !data().DefaultedMoveConstructorIsDeleted; 714 } 715 716 /// \c true if we know for sure that this class has a single, 717 /// accessible, unambiguous copy assignment operator that is not deleted. hasSimpleCopyAssignment()718 bool hasSimpleCopyAssignment() const { 719 return !hasUserDeclaredCopyAssignment() && 720 !data().DefaultedCopyAssignmentIsDeleted; 721 } 722 723 /// \c true if we know for sure that this class has a single, 724 /// accessible, unambiguous move assignment operator that is not deleted. hasSimpleMoveAssignment()725 bool hasSimpleMoveAssignment() const { 726 return !hasUserDeclaredMoveAssignment() && hasMoveAssignment() && 727 !data().DefaultedMoveAssignmentIsDeleted; 728 } 729 730 /// \c true if we know for sure that this class has an accessible 731 /// destructor that is not deleted. hasSimpleDestructor()732 bool hasSimpleDestructor() const { 733 return !hasUserDeclaredDestructor() && 734 !data().DefaultedDestructorIsDeleted; 735 } 736 737 /// Determine whether this class has any default constructors. hasDefaultConstructor()738 bool hasDefaultConstructor() const { 739 return (data().DeclaredSpecialMembers & SMF_DefaultConstructor) || 740 needsImplicitDefaultConstructor(); 741 } 742 743 /// Determine if we need to declare a default constructor for 744 /// this class. 745 /// 746 /// This value is used for lazy creation of default constructors. needsImplicitDefaultConstructor()747 bool needsImplicitDefaultConstructor() const { 748 return (!data().UserDeclaredConstructor && 749 !(data().DeclaredSpecialMembers & SMF_DefaultConstructor) && 750 (!isLambda() || lambdaIsDefaultConstructibleAndAssignable())) || 751 // FIXME: Proposed fix to core wording issue: if a class inherits 752 // a default constructor and doesn't explicitly declare one, one 753 // is declared implicitly. 754 (data().HasInheritedDefaultConstructor && 755 !(data().DeclaredSpecialMembers & SMF_DefaultConstructor)); 756 } 757 758 /// Determine whether this class has any user-declared constructors. 759 /// 760 /// When true, a default constructor will not be implicitly declared. hasUserDeclaredConstructor()761 bool hasUserDeclaredConstructor() const { 762 return data().UserDeclaredConstructor; 763 } 764 765 /// Whether this class has a user-provided default constructor 766 /// per C++11. hasUserProvidedDefaultConstructor()767 bool hasUserProvidedDefaultConstructor() const { 768 return data().UserProvidedDefaultConstructor; 769 } 770 771 /// Determine whether this class has a user-declared copy constructor. 772 /// 773 /// When false, a copy constructor will be implicitly declared. hasUserDeclaredCopyConstructor()774 bool hasUserDeclaredCopyConstructor() const { 775 return data().UserDeclaredSpecialMembers & SMF_CopyConstructor; 776 } 777 778 /// Determine whether this class needs an implicit copy 779 /// constructor to be lazily declared. needsImplicitCopyConstructor()780 bool needsImplicitCopyConstructor() const { 781 return !(data().DeclaredSpecialMembers & SMF_CopyConstructor); 782 } 783 784 /// Determine whether we need to eagerly declare a defaulted copy 785 /// constructor for this class. needsOverloadResolutionForCopyConstructor()786 bool needsOverloadResolutionForCopyConstructor() const { 787 // C++17 [class.copy.ctor]p6: 788 // If the class definition declares a move constructor or move assignment 789 // operator, the implicitly declared copy constructor is defined as 790 // deleted. 791 // In MSVC mode, sometimes a declared move assignment does not delete an 792 // implicit copy constructor, so defer this choice to Sema. 793 if (data().UserDeclaredSpecialMembers & 794 (SMF_MoveConstructor | SMF_MoveAssignment)) 795 return true; 796 return data().NeedOverloadResolutionForCopyConstructor; 797 } 798 799 /// Determine whether an implicit copy constructor for this type 800 /// would have a parameter with a const-qualified reference type. implicitCopyConstructorHasConstParam()801 bool implicitCopyConstructorHasConstParam() const { 802 return data().ImplicitCopyConstructorCanHaveConstParamForNonVBase && 803 (isAbstract() || 804 data().ImplicitCopyConstructorCanHaveConstParamForVBase); 805 } 806 807 /// Determine whether this class has a copy constructor with 808 /// a parameter type which is a reference to a const-qualified type. hasCopyConstructorWithConstParam()809 bool hasCopyConstructorWithConstParam() const { 810 return data().HasDeclaredCopyConstructorWithConstParam || 811 (needsImplicitCopyConstructor() && 812 implicitCopyConstructorHasConstParam()); 813 } 814 815 /// Whether this class has a user-declared move constructor or 816 /// assignment operator. 817 /// 818 /// When false, a move constructor and assignment operator may be 819 /// implicitly declared. hasUserDeclaredMoveOperation()820 bool hasUserDeclaredMoveOperation() const { 821 return data().UserDeclaredSpecialMembers & 822 (SMF_MoveConstructor | SMF_MoveAssignment); 823 } 824 825 /// Determine whether this class has had a move constructor 826 /// declared by the user. hasUserDeclaredMoveConstructor()827 bool hasUserDeclaredMoveConstructor() const { 828 return data().UserDeclaredSpecialMembers & SMF_MoveConstructor; 829 } 830 831 /// Determine whether this class has a move constructor. hasMoveConstructor()832 bool hasMoveConstructor() const { 833 return (data().DeclaredSpecialMembers & SMF_MoveConstructor) || 834 needsImplicitMoveConstructor(); 835 } 836 837 /// Set that we attempted to declare an implicit copy 838 /// constructor, but overload resolution failed so we deleted it. setImplicitCopyConstructorIsDeleted()839 void setImplicitCopyConstructorIsDeleted() { 840 assert((data().DefaultedCopyConstructorIsDeleted || 841 needsOverloadResolutionForCopyConstructor()) && 842 "Copy constructor should not be deleted"); 843 data().DefaultedCopyConstructorIsDeleted = true; 844 } 845 846 /// Set that we attempted to declare an implicit move 847 /// constructor, but overload resolution failed so we deleted it. setImplicitMoveConstructorIsDeleted()848 void setImplicitMoveConstructorIsDeleted() { 849 assert((data().DefaultedMoveConstructorIsDeleted || 850 needsOverloadResolutionForMoveConstructor()) && 851 "move constructor should not be deleted"); 852 data().DefaultedMoveConstructorIsDeleted = true; 853 } 854 855 /// Set that we attempted to declare an implicit destructor, 856 /// but overload resolution failed so we deleted it. setImplicitDestructorIsDeleted()857 void setImplicitDestructorIsDeleted() { 858 assert((data().DefaultedDestructorIsDeleted || 859 needsOverloadResolutionForDestructor()) && 860 "destructor should not be deleted"); 861 data().DefaultedDestructorIsDeleted = true; 862 } 863 864 /// Determine whether this class should get an implicit move 865 /// constructor or if any existing special member function inhibits this. needsImplicitMoveConstructor()866 bool needsImplicitMoveConstructor() const { 867 return !(data().DeclaredSpecialMembers & SMF_MoveConstructor) && 868 !hasUserDeclaredCopyConstructor() && 869 !hasUserDeclaredCopyAssignment() && 870 !hasUserDeclaredMoveAssignment() && 871 !hasUserDeclaredDestructor(); 872 } 873 874 /// Determine whether we need to eagerly declare a defaulted move 875 /// constructor for this class. needsOverloadResolutionForMoveConstructor()876 bool needsOverloadResolutionForMoveConstructor() const { 877 return data().NeedOverloadResolutionForMoveConstructor; 878 } 879 880 /// Determine whether this class has a user-declared copy assignment 881 /// operator. 882 /// 883 /// When false, a copy assignment operator will be implicitly declared. hasUserDeclaredCopyAssignment()884 bool hasUserDeclaredCopyAssignment() const { 885 return data().UserDeclaredSpecialMembers & SMF_CopyAssignment; 886 } 887 888 /// Set that we attempted to declare an implicit copy assignment 889 /// operator, but overload resolution failed so we deleted it. setImplicitCopyAssignmentIsDeleted()890 void setImplicitCopyAssignmentIsDeleted() { 891 assert((data().DefaultedCopyAssignmentIsDeleted || 892 needsOverloadResolutionForCopyAssignment()) && 893 "copy assignment should not be deleted"); 894 data().DefaultedCopyAssignmentIsDeleted = true; 895 } 896 897 /// Determine whether this class needs an implicit copy 898 /// assignment operator to be lazily declared. needsImplicitCopyAssignment()899 bool needsImplicitCopyAssignment() const { 900 return !(data().DeclaredSpecialMembers & SMF_CopyAssignment); 901 } 902 903 /// Determine whether we need to eagerly declare a defaulted copy 904 /// assignment operator for this class. needsOverloadResolutionForCopyAssignment()905 bool needsOverloadResolutionForCopyAssignment() const { 906 // C++20 [class.copy.assign]p2: 907 // If the class definition declares a move constructor or move assignment 908 // operator, the implicitly declared copy assignment operator is defined 909 // as deleted. 910 // In MSVC mode, sometimes a declared move constructor does not delete an 911 // implicit copy assignment, so defer this choice to Sema. 912 if (data().UserDeclaredSpecialMembers & 913 (SMF_MoveConstructor | SMF_MoveAssignment)) 914 return true; 915 return data().NeedOverloadResolutionForCopyAssignment; 916 } 917 918 /// Determine whether an implicit copy assignment operator for this 919 /// type would have a parameter with a const-qualified reference type. implicitCopyAssignmentHasConstParam()920 bool implicitCopyAssignmentHasConstParam() const { 921 return data().ImplicitCopyAssignmentHasConstParam; 922 } 923 924 /// Determine whether this class has a copy assignment operator with 925 /// a parameter type which is a reference to a const-qualified type or is not 926 /// a reference. hasCopyAssignmentWithConstParam()927 bool hasCopyAssignmentWithConstParam() const { 928 return data().HasDeclaredCopyAssignmentWithConstParam || 929 (needsImplicitCopyAssignment() && 930 implicitCopyAssignmentHasConstParam()); 931 } 932 933 /// Determine whether this class has had a move assignment 934 /// declared by the user. hasUserDeclaredMoveAssignment()935 bool hasUserDeclaredMoveAssignment() const { 936 return data().UserDeclaredSpecialMembers & SMF_MoveAssignment; 937 } 938 939 /// Determine whether this class has a move assignment operator. hasMoveAssignment()940 bool hasMoveAssignment() const { 941 return (data().DeclaredSpecialMembers & SMF_MoveAssignment) || 942 needsImplicitMoveAssignment(); 943 } 944 945 /// Set that we attempted to declare an implicit move assignment 946 /// operator, but overload resolution failed so we deleted it. setImplicitMoveAssignmentIsDeleted()947 void setImplicitMoveAssignmentIsDeleted() { 948 assert((data().DefaultedMoveAssignmentIsDeleted || 949 needsOverloadResolutionForMoveAssignment()) && 950 "move assignment should not be deleted"); 951 data().DefaultedMoveAssignmentIsDeleted = true; 952 } 953 954 /// Determine whether this class should get an implicit move 955 /// assignment operator or if any existing special member function inhibits 956 /// this. needsImplicitMoveAssignment()957 bool needsImplicitMoveAssignment() const { 958 return !(data().DeclaredSpecialMembers & SMF_MoveAssignment) && 959 !hasUserDeclaredCopyConstructor() && 960 !hasUserDeclaredCopyAssignment() && 961 !hasUserDeclaredMoveConstructor() && 962 !hasUserDeclaredDestructor() && 963 (!isLambda() || lambdaIsDefaultConstructibleAndAssignable()); 964 } 965 966 /// Determine whether we need to eagerly declare a move assignment 967 /// operator for this class. needsOverloadResolutionForMoveAssignment()968 bool needsOverloadResolutionForMoveAssignment() const { 969 return data().NeedOverloadResolutionForMoveAssignment; 970 } 971 972 /// Determine whether this class has a user-declared destructor. 973 /// 974 /// When false, a destructor will be implicitly declared. hasUserDeclaredDestructor()975 bool hasUserDeclaredDestructor() const { 976 return data().UserDeclaredSpecialMembers & SMF_Destructor; 977 } 978 979 /// Determine whether this class needs an implicit destructor to 980 /// be lazily declared. needsImplicitDestructor()981 bool needsImplicitDestructor() const { 982 return !(data().DeclaredSpecialMembers & SMF_Destructor); 983 } 984 985 /// Determine whether we need to eagerly declare a destructor for this 986 /// class. needsOverloadResolutionForDestructor()987 bool needsOverloadResolutionForDestructor() const { 988 return data().NeedOverloadResolutionForDestructor; 989 } 990 991 /// Determine whether this class describes a lambda function object. isLambda()992 bool isLambda() const { 993 // An update record can't turn a non-lambda into a lambda. 994 auto *DD = DefinitionData; 995 return DD && DD->IsLambda; 996 } 997 998 /// Determine whether this class describes a generic 999 /// lambda function object (i.e. function call operator is 1000 /// a template). 1001 bool isGenericLambda() const; 1002 1003 /// Determine whether this lambda should have an implicit default constructor 1004 /// and copy and move assignment operators. 1005 bool lambdaIsDefaultConstructibleAndAssignable() const; 1006 1007 /// Retrieve the lambda call operator of the closure type 1008 /// if this is a closure type. 1009 CXXMethodDecl *getLambdaCallOperator() const; 1010 1011 /// Retrieve the dependent lambda call operator of the closure type 1012 /// if this is a templated closure type. 1013 FunctionTemplateDecl *getDependentLambdaCallOperator() const; 1014 1015 /// Retrieve the lambda static invoker, the address of which 1016 /// is returned by the conversion operator, and the body of which 1017 /// is forwarded to the lambda call operator. The version that does not 1018 /// take a calling convention uses the 'default' calling convention for free 1019 /// functions if the Lambda's calling convention was not modified via 1020 /// attribute. Otherwise, it will return the calling convention specified for 1021 /// the lambda. 1022 CXXMethodDecl *getLambdaStaticInvoker() const; 1023 CXXMethodDecl *getLambdaStaticInvoker(CallingConv CC) const; 1024 1025 /// Retrieve the generic lambda's template parameter list. 1026 /// Returns null if the class does not represent a lambda or a generic 1027 /// lambda. 1028 TemplateParameterList *getGenericLambdaTemplateParameterList() const; 1029 1030 /// Retrieve the lambda template parameters that were specified explicitly. 1031 ArrayRef<NamedDecl *> getLambdaExplicitTemplateParameters() const; 1032 getLambdaCaptureDefault()1033 LambdaCaptureDefault getLambdaCaptureDefault() const { 1034 assert(isLambda()); 1035 return static_cast<LambdaCaptureDefault>(getLambdaData().CaptureDefault); 1036 } 1037 1038 /// Set the captures for this lambda closure type. 1039 void setCaptures(ASTContext &Context, ArrayRef<LambdaCapture> Captures); 1040 1041 /// For a closure type, retrieve the mapping from captured 1042 /// variables and \c this to the non-static data members that store the 1043 /// values or references of the captures. 1044 /// 1045 /// \param Captures Will be populated with the mapping from captured 1046 /// variables to the corresponding fields. 1047 /// 1048 /// \param ThisCapture Will be set to the field declaration for the 1049 /// \c this capture. 1050 /// 1051 /// \note No entries will be added for init-captures, as they do not capture 1052 /// variables. 1053 void getCaptureFields(llvm::DenseMap<const VarDecl *, FieldDecl *> &Captures, 1054 FieldDecl *&ThisCapture) const; 1055 1056 using capture_const_iterator = const LambdaCapture *; 1057 using capture_const_range = llvm::iterator_range<capture_const_iterator>; 1058 captures()1059 capture_const_range captures() const { 1060 return capture_const_range(captures_begin(), captures_end()); 1061 } 1062 captures_begin()1063 capture_const_iterator captures_begin() const { 1064 return isLambda() ? getLambdaData().Captures : nullptr; 1065 } 1066 captures_end()1067 capture_const_iterator captures_end() const { 1068 return isLambda() ? captures_begin() + getLambdaData().NumCaptures 1069 : nullptr; 1070 } 1071 capture_size()1072 unsigned capture_size() const { return getLambdaData().NumCaptures; } 1073 1074 using conversion_iterator = UnresolvedSetIterator; 1075 conversion_begin()1076 conversion_iterator conversion_begin() const { 1077 return data().Conversions.get(getASTContext()).begin(); 1078 } 1079 conversion_end()1080 conversion_iterator conversion_end() const { 1081 return data().Conversions.get(getASTContext()).end(); 1082 } 1083 1084 /// Removes a conversion function from this class. The conversion 1085 /// function must currently be a member of this class. Furthermore, 1086 /// this class must currently be in the process of being defined. 1087 void removeConversion(const NamedDecl *Old); 1088 1089 /// Get all conversion functions visible in current class, 1090 /// including conversion function templates. 1091 llvm::iterator_range<conversion_iterator> 1092 getVisibleConversionFunctions() const; 1093 1094 /// Determine whether this class is an aggregate (C++ [dcl.init.aggr]), 1095 /// which is a class with no user-declared constructors, no private 1096 /// or protected non-static data members, no base classes, and no virtual 1097 /// functions (C++ [dcl.init.aggr]p1). isAggregate()1098 bool isAggregate() const { return data().Aggregate; } 1099 1100 /// Whether this class has any in-class initializers 1101 /// for non-static data members (including those in anonymous unions or 1102 /// structs). hasInClassInitializer()1103 bool hasInClassInitializer() const { return data().HasInClassInitializer; } 1104 1105 /// Whether this class or any of its subobjects has any members of 1106 /// reference type which would make value-initialization ill-formed. 1107 /// 1108 /// Per C++03 [dcl.init]p5: 1109 /// - if T is a non-union class type without a user-declared constructor, 1110 /// then every non-static data member and base-class component of T is 1111 /// value-initialized [...] A program that calls for [...] 1112 /// value-initialization of an entity of reference type is ill-formed. hasUninitializedReferenceMember()1113 bool hasUninitializedReferenceMember() const { 1114 return !isUnion() && !hasUserDeclaredConstructor() && 1115 data().HasUninitializedReferenceMember; 1116 } 1117 1118 /// Whether this class is a POD-type (C++ [class]p4) 1119 /// 1120 /// For purposes of this function a class is POD if it is an aggregate 1121 /// that has no non-static non-POD data members, no reference data 1122 /// members, no user-defined copy assignment operator and no 1123 /// user-defined destructor. 1124 /// 1125 /// Note that this is the C++ TR1 definition of POD. isPOD()1126 bool isPOD() const { return data().PlainOldData; } 1127 1128 /// True if this class is C-like, without C++-specific features, e.g. 1129 /// it contains only public fields, no bases, tag kind is not 'class', etc. 1130 bool isCLike() const; 1131 1132 /// Determine whether this is an empty class in the sense of 1133 /// (C++11 [meta.unary.prop]). 1134 /// 1135 /// The CXXRecordDecl is a class type, but not a union type, 1136 /// with no non-static data members other than bit-fields of length 0, 1137 /// no virtual member functions, no virtual base classes, 1138 /// and no base class B for which is_empty<B>::value is false. 1139 /// 1140 /// \note This does NOT include a check for union-ness. isEmpty()1141 bool isEmpty() const { return data().Empty; } 1142 hasPrivateFields()1143 bool hasPrivateFields() const { 1144 return data().HasPrivateFields; 1145 } 1146 hasProtectedFields()1147 bool hasProtectedFields() const { 1148 return data().HasProtectedFields; 1149 } 1150 1151 /// Determine whether this class has direct non-static data members. hasDirectFields()1152 bool hasDirectFields() const { 1153 auto &D = data(); 1154 return D.HasPublicFields || D.HasProtectedFields || D.HasPrivateFields; 1155 } 1156 1157 /// Whether this class is polymorphic (C++ [class.virtual]), 1158 /// which means that the class contains or inherits a virtual function. isPolymorphic()1159 bool isPolymorphic() const { return data().Polymorphic; } 1160 1161 /// Determine whether this class has a pure virtual function. 1162 /// 1163 /// The class is is abstract per (C++ [class.abstract]p2) if it declares 1164 /// a pure virtual function or inherits a pure virtual function that is 1165 /// not overridden. isAbstract()1166 bool isAbstract() const { return data().Abstract; } 1167 1168 /// Determine whether this class is standard-layout per 1169 /// C++ [class]p7. isStandardLayout()1170 bool isStandardLayout() const { return data().IsStandardLayout; } 1171 1172 /// Determine whether this class was standard-layout per 1173 /// C++11 [class]p7, specifically using the C++11 rules without any DRs. isCXX11StandardLayout()1174 bool isCXX11StandardLayout() const { return data().IsCXX11StandardLayout; } 1175 1176 /// Determine whether this class, or any of its class subobjects, 1177 /// contains a mutable field. hasMutableFields()1178 bool hasMutableFields() const { return data().HasMutableFields; } 1179 1180 /// Determine whether this class has any variant members. hasVariantMembers()1181 bool hasVariantMembers() const { return data().HasVariantMembers; } 1182 1183 /// Determine whether this class has a trivial default constructor 1184 /// (C++11 [class.ctor]p5). hasTrivialDefaultConstructor()1185 bool hasTrivialDefaultConstructor() const { 1186 return hasDefaultConstructor() && 1187 (data().HasTrivialSpecialMembers & SMF_DefaultConstructor); 1188 } 1189 1190 /// Determine whether this class has a non-trivial default constructor 1191 /// (C++11 [class.ctor]p5). hasNonTrivialDefaultConstructor()1192 bool hasNonTrivialDefaultConstructor() const { 1193 return (data().DeclaredNonTrivialSpecialMembers & SMF_DefaultConstructor) || 1194 (needsImplicitDefaultConstructor() && 1195 !(data().HasTrivialSpecialMembers & SMF_DefaultConstructor)); 1196 } 1197 1198 /// Determine whether this class has at least one constexpr constructor 1199 /// other than the copy or move constructors. hasConstexprNonCopyMoveConstructor()1200 bool hasConstexprNonCopyMoveConstructor() const { 1201 return data().HasConstexprNonCopyMoveConstructor || 1202 (needsImplicitDefaultConstructor() && 1203 defaultedDefaultConstructorIsConstexpr()); 1204 } 1205 1206 /// Determine whether a defaulted default constructor for this class 1207 /// would be constexpr. defaultedDefaultConstructorIsConstexpr()1208 bool defaultedDefaultConstructorIsConstexpr() const { 1209 return data().DefaultedDefaultConstructorIsConstexpr && 1210 (!isUnion() || hasInClassInitializer() || !hasVariantMembers() || 1211 getLangOpts().CPlusPlus20); 1212 } 1213 1214 /// Determine whether this class has a constexpr default constructor. hasConstexprDefaultConstructor()1215 bool hasConstexprDefaultConstructor() const { 1216 return data().HasConstexprDefaultConstructor || 1217 (needsImplicitDefaultConstructor() && 1218 defaultedDefaultConstructorIsConstexpr()); 1219 } 1220 1221 /// Determine whether this class has a trivial copy constructor 1222 /// (C++ [class.copy]p6, C++11 [class.copy]p12) hasTrivialCopyConstructor()1223 bool hasTrivialCopyConstructor() const { 1224 return data().HasTrivialSpecialMembers & SMF_CopyConstructor; 1225 } 1226 hasTrivialCopyConstructorForCall()1227 bool hasTrivialCopyConstructorForCall() const { 1228 return data().HasTrivialSpecialMembersForCall & SMF_CopyConstructor; 1229 } 1230 1231 /// Determine whether this class has a non-trivial copy constructor 1232 /// (C++ [class.copy]p6, C++11 [class.copy]p12) hasNonTrivialCopyConstructor()1233 bool hasNonTrivialCopyConstructor() const { 1234 return data().DeclaredNonTrivialSpecialMembers & SMF_CopyConstructor || 1235 !hasTrivialCopyConstructor(); 1236 } 1237 hasNonTrivialCopyConstructorForCall()1238 bool hasNonTrivialCopyConstructorForCall() const { 1239 return (data().DeclaredNonTrivialSpecialMembersForCall & 1240 SMF_CopyConstructor) || 1241 !hasTrivialCopyConstructorForCall(); 1242 } 1243 1244 /// Determine whether this class has a trivial move constructor 1245 /// (C++11 [class.copy]p12) hasTrivialMoveConstructor()1246 bool hasTrivialMoveConstructor() const { 1247 return hasMoveConstructor() && 1248 (data().HasTrivialSpecialMembers & SMF_MoveConstructor); 1249 } 1250 hasTrivialMoveConstructorForCall()1251 bool hasTrivialMoveConstructorForCall() const { 1252 return hasMoveConstructor() && 1253 (data().HasTrivialSpecialMembersForCall & SMF_MoveConstructor); 1254 } 1255 1256 /// Determine whether this class has a non-trivial move constructor 1257 /// (C++11 [class.copy]p12) hasNonTrivialMoveConstructor()1258 bool hasNonTrivialMoveConstructor() const { 1259 return (data().DeclaredNonTrivialSpecialMembers & SMF_MoveConstructor) || 1260 (needsImplicitMoveConstructor() && 1261 !(data().HasTrivialSpecialMembers & SMF_MoveConstructor)); 1262 } 1263 hasNonTrivialMoveConstructorForCall()1264 bool hasNonTrivialMoveConstructorForCall() const { 1265 return (data().DeclaredNonTrivialSpecialMembersForCall & 1266 SMF_MoveConstructor) || 1267 (needsImplicitMoveConstructor() && 1268 !(data().HasTrivialSpecialMembersForCall & SMF_MoveConstructor)); 1269 } 1270 1271 /// Determine whether this class has a trivial copy assignment operator 1272 /// (C++ [class.copy]p11, C++11 [class.copy]p25) hasTrivialCopyAssignment()1273 bool hasTrivialCopyAssignment() const { 1274 return data().HasTrivialSpecialMembers & SMF_CopyAssignment; 1275 } 1276 1277 /// Determine whether this class has a non-trivial copy assignment 1278 /// operator (C++ [class.copy]p11, C++11 [class.copy]p25) hasNonTrivialCopyAssignment()1279 bool hasNonTrivialCopyAssignment() const { 1280 return data().DeclaredNonTrivialSpecialMembers & SMF_CopyAssignment || 1281 !hasTrivialCopyAssignment(); 1282 } 1283 1284 /// Determine whether this class has a trivial move assignment operator 1285 /// (C++11 [class.copy]p25) hasTrivialMoveAssignment()1286 bool hasTrivialMoveAssignment() const { 1287 return hasMoveAssignment() && 1288 (data().HasTrivialSpecialMembers & SMF_MoveAssignment); 1289 } 1290 1291 /// Determine whether this class has a non-trivial move assignment 1292 /// operator (C++11 [class.copy]p25) hasNonTrivialMoveAssignment()1293 bool hasNonTrivialMoveAssignment() const { 1294 return (data().DeclaredNonTrivialSpecialMembers & SMF_MoveAssignment) || 1295 (needsImplicitMoveAssignment() && 1296 !(data().HasTrivialSpecialMembers & SMF_MoveAssignment)); 1297 } 1298 1299 /// Determine whether a defaulted default constructor for this class 1300 /// would be constexpr. defaultedDestructorIsConstexpr()1301 bool defaultedDestructorIsConstexpr() const { 1302 return data().DefaultedDestructorIsConstexpr && 1303 getLangOpts().CPlusPlus20; 1304 } 1305 1306 /// Determine whether this class has a constexpr destructor. 1307 bool hasConstexprDestructor() const; 1308 1309 /// Determine whether this class has a trivial destructor 1310 /// (C++ [class.dtor]p3) hasTrivialDestructor()1311 bool hasTrivialDestructor() const { 1312 return data().HasTrivialSpecialMembers & SMF_Destructor; 1313 } 1314 hasTrivialDestructorForCall()1315 bool hasTrivialDestructorForCall() const { 1316 return data().HasTrivialSpecialMembersForCall & SMF_Destructor; 1317 } 1318 1319 /// Determine whether this class has a non-trivial destructor 1320 /// (C++ [class.dtor]p3) hasNonTrivialDestructor()1321 bool hasNonTrivialDestructor() const { 1322 return !(data().HasTrivialSpecialMembers & SMF_Destructor); 1323 } 1324 hasNonTrivialDestructorForCall()1325 bool hasNonTrivialDestructorForCall() const { 1326 return !(data().HasTrivialSpecialMembersForCall & SMF_Destructor); 1327 } 1328 setHasTrivialSpecialMemberForCall()1329 void setHasTrivialSpecialMemberForCall() { 1330 data().HasTrivialSpecialMembersForCall = 1331 (SMF_CopyConstructor | SMF_MoveConstructor | SMF_Destructor); 1332 } 1333 1334 /// Determine whether declaring a const variable with this type is ok 1335 /// per core issue 253. allowConstDefaultInit()1336 bool allowConstDefaultInit() const { 1337 return !data().HasUninitializedFields || 1338 !(data().HasDefaultedDefaultConstructor || 1339 needsImplicitDefaultConstructor()); 1340 } 1341 1342 /// Determine whether this class has a destructor which has no 1343 /// semantic effect. 1344 /// 1345 /// Any such destructor will be trivial, public, defaulted and not deleted, 1346 /// and will call only irrelevant destructors. hasIrrelevantDestructor()1347 bool hasIrrelevantDestructor() const { 1348 return data().HasIrrelevantDestructor; 1349 } 1350 1351 /// Determine whether this class has a non-literal or/ volatile type 1352 /// non-static data member or base class. hasNonLiteralTypeFieldsOrBases()1353 bool hasNonLiteralTypeFieldsOrBases() const { 1354 return data().HasNonLiteralTypeFieldsOrBases; 1355 } 1356 1357 /// Determine whether this class has a using-declaration that names 1358 /// a user-declared base class constructor. hasInheritedConstructor()1359 bool hasInheritedConstructor() const { 1360 return data().HasInheritedConstructor; 1361 } 1362 1363 /// Determine whether this class has a using-declaration that names 1364 /// a base class assignment operator. hasInheritedAssignment()1365 bool hasInheritedAssignment() const { 1366 return data().HasInheritedAssignment; 1367 } 1368 1369 /// Determine whether this class is considered trivially copyable per 1370 /// (C++11 [class]p6). 1371 bool isTriviallyCopyable() const; 1372 1373 /// Determine whether this class is considered trivial. 1374 /// 1375 /// C++11 [class]p6: 1376 /// "A trivial class is a class that has a trivial default constructor and 1377 /// is trivially copyable." isTrivial()1378 bool isTrivial() const { 1379 return isTriviallyCopyable() && hasTrivialDefaultConstructor(); 1380 } 1381 1382 /// Determine whether this class is a literal type. 1383 /// 1384 /// C++11 [basic.types]p10: 1385 /// A class type that has all the following properties: 1386 /// - it has a trivial destructor 1387 /// - every constructor call and full-expression in the 1388 /// brace-or-equal-intializers for non-static data members (if any) is 1389 /// a constant expression. 1390 /// - it is an aggregate type or has at least one constexpr constructor 1391 /// or constructor template that is not a copy or move constructor, and 1392 /// - all of its non-static data members and base classes are of literal 1393 /// types 1394 /// 1395 /// We resolve DR1361 by ignoring the second bullet. We resolve DR1452 by 1396 /// treating types with trivial default constructors as literal types. 1397 /// 1398 /// Only in C++17 and beyond, are lambdas literal types. isLiteral()1399 bool isLiteral() const { 1400 const LangOptions &LangOpts = getLangOpts(); 1401 return (LangOpts.CPlusPlus20 ? hasConstexprDestructor() 1402 : hasTrivialDestructor()) && 1403 (!isLambda() || LangOpts.CPlusPlus17) && 1404 !hasNonLiteralTypeFieldsOrBases() && 1405 (isAggregate() || isLambda() || 1406 hasConstexprNonCopyMoveConstructor() || 1407 hasTrivialDefaultConstructor()); 1408 } 1409 1410 /// Determine whether this is a structural type. isStructural()1411 bool isStructural() const { 1412 return isLiteral() && data().StructuralIfLiteral; 1413 } 1414 1415 /// If this record is an instantiation of a member class, 1416 /// retrieves the member class from which it was instantiated. 1417 /// 1418 /// This routine will return non-null for (non-templated) member 1419 /// classes of class templates. For example, given: 1420 /// 1421 /// \code 1422 /// template<typename T> 1423 /// struct X { 1424 /// struct A { }; 1425 /// }; 1426 /// \endcode 1427 /// 1428 /// The declaration for X<int>::A is a (non-templated) CXXRecordDecl 1429 /// whose parent is the class template specialization X<int>. For 1430 /// this declaration, getInstantiatedFromMemberClass() will return 1431 /// the CXXRecordDecl X<T>::A. When a complete definition of 1432 /// X<int>::A is required, it will be instantiated from the 1433 /// declaration returned by getInstantiatedFromMemberClass(). 1434 CXXRecordDecl *getInstantiatedFromMemberClass() const; 1435 1436 /// If this class is an instantiation of a member class of a 1437 /// class template specialization, retrieves the member specialization 1438 /// information. 1439 MemberSpecializationInfo *getMemberSpecializationInfo() const; 1440 1441 /// Specify that this record is an instantiation of the 1442 /// member class \p RD. 1443 void setInstantiationOfMemberClass(CXXRecordDecl *RD, 1444 TemplateSpecializationKind TSK); 1445 1446 /// Retrieves the class template that is described by this 1447 /// class declaration. 1448 /// 1449 /// Every class template is represented as a ClassTemplateDecl and a 1450 /// CXXRecordDecl. The former contains template properties (such as 1451 /// the template parameter lists) while the latter contains the 1452 /// actual description of the template's 1453 /// contents. ClassTemplateDecl::getTemplatedDecl() retrieves the 1454 /// CXXRecordDecl that from a ClassTemplateDecl, while 1455 /// getDescribedClassTemplate() retrieves the ClassTemplateDecl from 1456 /// a CXXRecordDecl. 1457 ClassTemplateDecl *getDescribedClassTemplate() const; 1458 1459 void setDescribedClassTemplate(ClassTemplateDecl *Template); 1460 1461 /// Determine whether this particular class is a specialization or 1462 /// instantiation of a class template or member class of a class template, 1463 /// and how it was instantiated or specialized. 1464 TemplateSpecializationKind getTemplateSpecializationKind() const; 1465 1466 /// Set the kind of specialization or template instantiation this is. 1467 void setTemplateSpecializationKind(TemplateSpecializationKind TSK); 1468 1469 /// Retrieve the record declaration from which this record could be 1470 /// instantiated. Returns null if this class is not a template instantiation. 1471 const CXXRecordDecl *getTemplateInstantiationPattern() const; 1472 getTemplateInstantiationPattern()1473 CXXRecordDecl *getTemplateInstantiationPattern() { 1474 return const_cast<CXXRecordDecl *>(const_cast<const CXXRecordDecl *>(this) 1475 ->getTemplateInstantiationPattern()); 1476 } 1477 1478 /// Returns the destructor decl for this class. 1479 CXXDestructorDecl *getDestructor() const; 1480 1481 /// Returns true if the class destructor, or any implicitly invoked 1482 /// destructors are marked noreturn. isAnyDestructorNoReturn()1483 bool isAnyDestructorNoReturn() const { return data().IsAnyDestructorNoReturn; } 1484 1485 /// If the class is a local class [class.local], returns 1486 /// the enclosing function declaration. isLocalClass()1487 const FunctionDecl *isLocalClass() const { 1488 if (const auto *RD = dyn_cast<CXXRecordDecl>(getDeclContext())) 1489 return RD->isLocalClass(); 1490 1491 return dyn_cast<FunctionDecl>(getDeclContext()); 1492 } 1493 isLocalClass()1494 FunctionDecl *isLocalClass() { 1495 return const_cast<FunctionDecl*>( 1496 const_cast<const CXXRecordDecl*>(this)->isLocalClass()); 1497 } 1498 1499 /// Determine whether this dependent class is a current instantiation, 1500 /// when viewed from within the given context. 1501 bool isCurrentInstantiation(const DeclContext *CurContext) const; 1502 1503 /// Determine whether this class is derived from the class \p Base. 1504 /// 1505 /// This routine only determines whether this class is derived from \p Base, 1506 /// but does not account for factors that may make a Derived -> Base class 1507 /// ill-formed, such as private/protected inheritance or multiple, ambiguous 1508 /// base class subobjects. 1509 /// 1510 /// \param Base the base class we are searching for. 1511 /// 1512 /// \returns true if this class is derived from Base, false otherwise. 1513 bool isDerivedFrom(const CXXRecordDecl *Base) const; 1514 1515 /// Determine whether this class is derived from the type \p Base. 1516 /// 1517 /// This routine only determines whether this class is derived from \p Base, 1518 /// but does not account for factors that may make a Derived -> Base class 1519 /// ill-formed, such as private/protected inheritance or multiple, ambiguous 1520 /// base class subobjects. 1521 /// 1522 /// \param Base the base class we are searching for. 1523 /// 1524 /// \param Paths will contain the paths taken from the current class to the 1525 /// given \p Base class. 1526 /// 1527 /// \returns true if this class is derived from \p Base, false otherwise. 1528 /// 1529 /// \todo add a separate parameter to configure IsDerivedFrom, rather than 1530 /// tangling input and output in \p Paths 1531 bool isDerivedFrom(const CXXRecordDecl *Base, CXXBasePaths &Paths) const; 1532 1533 /// Determine whether this class is virtually derived from 1534 /// the class \p Base. 1535 /// 1536 /// This routine only determines whether this class is virtually 1537 /// derived from \p Base, but does not account for factors that may 1538 /// make a Derived -> Base class ill-formed, such as 1539 /// private/protected inheritance or multiple, ambiguous base class 1540 /// subobjects. 1541 /// 1542 /// \param Base the base class we are searching for. 1543 /// 1544 /// \returns true if this class is virtually derived from Base, 1545 /// false otherwise. 1546 bool isVirtuallyDerivedFrom(const CXXRecordDecl *Base) const; 1547 1548 /// Determine whether this class is provably not derived from 1549 /// the type \p Base. 1550 bool isProvablyNotDerivedFrom(const CXXRecordDecl *Base) const; 1551 1552 /// Function type used by forallBases() as a callback. 1553 /// 1554 /// \param BaseDefinition the definition of the base class 1555 /// 1556 /// \returns true if this base matched the search criteria 1557 using ForallBasesCallback = 1558 llvm::function_ref<bool(const CXXRecordDecl *BaseDefinition)>; 1559 1560 /// Determines if the given callback holds for all the direct 1561 /// or indirect base classes of this type. 1562 /// 1563 /// The class itself does not count as a base class. This routine 1564 /// returns false if the class has non-computable base classes. 1565 /// 1566 /// \param BaseMatches Callback invoked for each (direct or indirect) base 1567 /// class of this type until a call returns false. 1568 bool forallBases(ForallBasesCallback BaseMatches) const; 1569 1570 /// Function type used by lookupInBases() to determine whether a 1571 /// specific base class subobject matches the lookup criteria. 1572 /// 1573 /// \param Specifier the base-class specifier that describes the inheritance 1574 /// from the base class we are trying to match. 1575 /// 1576 /// \param Path the current path, from the most-derived class down to the 1577 /// base named by the \p Specifier. 1578 /// 1579 /// \returns true if this base matched the search criteria, false otherwise. 1580 using BaseMatchesCallback = 1581 llvm::function_ref<bool(const CXXBaseSpecifier *Specifier, 1582 CXXBasePath &Path)>; 1583 1584 /// Look for entities within the base classes of this C++ class, 1585 /// transitively searching all base class subobjects. 1586 /// 1587 /// This routine uses the callback function \p BaseMatches to find base 1588 /// classes meeting some search criteria, walking all base class subobjects 1589 /// and populating the given \p Paths structure with the paths through the 1590 /// inheritance hierarchy that resulted in a match. On a successful search, 1591 /// the \p Paths structure can be queried to retrieve the matching paths and 1592 /// to determine if there were any ambiguities. 1593 /// 1594 /// \param BaseMatches callback function used to determine whether a given 1595 /// base matches the user-defined search criteria. 1596 /// 1597 /// \param Paths used to record the paths from this class to its base class 1598 /// subobjects that match the search criteria. 1599 /// 1600 /// \param LookupInDependent can be set to true to extend the search to 1601 /// dependent base classes. 1602 /// 1603 /// \returns true if there exists any path from this class to a base class 1604 /// subobject that matches the search criteria. 1605 bool lookupInBases(BaseMatchesCallback BaseMatches, CXXBasePaths &Paths, 1606 bool LookupInDependent = false) const; 1607 1608 /// Base-class lookup callback that determines whether the given 1609 /// base class specifier refers to a specific class declaration. 1610 /// 1611 /// This callback can be used with \c lookupInBases() to determine whether 1612 /// a given derived class has is a base class subobject of a particular type. 1613 /// The base record pointer should refer to the canonical CXXRecordDecl of the 1614 /// base class that we are searching for. 1615 static bool FindBaseClass(const CXXBaseSpecifier *Specifier, 1616 CXXBasePath &Path, const CXXRecordDecl *BaseRecord); 1617 1618 /// Base-class lookup callback that determines whether the 1619 /// given base class specifier refers to a specific class 1620 /// declaration and describes virtual derivation. 1621 /// 1622 /// This callback can be used with \c lookupInBases() to determine 1623 /// whether a given derived class has is a virtual base class 1624 /// subobject of a particular type. The base record pointer should 1625 /// refer to the canonical CXXRecordDecl of the base class that we 1626 /// are searching for. 1627 static bool FindVirtualBaseClass(const CXXBaseSpecifier *Specifier, 1628 CXXBasePath &Path, 1629 const CXXRecordDecl *BaseRecord); 1630 1631 /// Retrieve the final overriders for each virtual member 1632 /// function in the class hierarchy where this class is the 1633 /// most-derived class in the class hierarchy. 1634 void getFinalOverriders(CXXFinalOverriderMap &FinaOverriders) const; 1635 1636 /// Get the indirect primary bases for this class. 1637 void getIndirectPrimaryBases(CXXIndirectPrimaryBaseSet& Bases) const; 1638 1639 /// Determine whether this class has a member with the given name, possibly 1640 /// in a non-dependent base class. 1641 /// 1642 /// No check for ambiguity is performed, so this should never be used when 1643 /// implementing language semantics, but it may be appropriate for warnings, 1644 /// static analysis, or similar. 1645 bool hasMemberName(DeclarationName N) const; 1646 1647 /// Performs an imprecise lookup of a dependent name in this class. 1648 /// 1649 /// This function does not follow strict semantic rules and should be used 1650 /// only when lookup rules can be relaxed, e.g. indexing. 1651 std::vector<const NamedDecl *> 1652 lookupDependentName(DeclarationName Name, 1653 llvm::function_ref<bool(const NamedDecl *ND)> Filter); 1654 1655 /// Renders and displays an inheritance diagram 1656 /// for this C++ class and all of its base classes (transitively) using 1657 /// GraphViz. 1658 void viewInheritance(ASTContext& Context) const; 1659 1660 /// Calculates the access of a decl that is reached 1661 /// along a path. MergeAccess(AccessSpecifier PathAccess,AccessSpecifier DeclAccess)1662 static AccessSpecifier MergeAccess(AccessSpecifier PathAccess, 1663 AccessSpecifier DeclAccess) { 1664 assert(DeclAccess != AS_none); 1665 if (DeclAccess == AS_private) return AS_none; 1666 return (PathAccess > DeclAccess ? PathAccess : DeclAccess); 1667 } 1668 1669 /// Indicates that the declaration of a defaulted or deleted special 1670 /// member function is now complete. 1671 void finishedDefaultedOrDeletedMember(CXXMethodDecl *MD); 1672 1673 void setTrivialForCallFlags(CXXMethodDecl *MD); 1674 1675 /// Indicates that the definition of this class is now complete. 1676 void completeDefinition() override; 1677 1678 /// Indicates that the definition of this class is now complete, 1679 /// and provides a final overrider map to help determine 1680 /// 1681 /// \param FinalOverriders The final overrider map for this class, which can 1682 /// be provided as an optimization for abstract-class checking. If NULL, 1683 /// final overriders will be computed if they are needed to complete the 1684 /// definition. 1685 void completeDefinition(CXXFinalOverriderMap *FinalOverriders); 1686 1687 /// Determine whether this class may end up being abstract, even though 1688 /// it is not yet known to be abstract. 1689 /// 1690 /// \returns true if this class is not known to be abstract but has any 1691 /// base classes that are abstract. In this case, \c completeDefinition() 1692 /// will need to compute final overriders to determine whether the class is 1693 /// actually abstract. 1694 bool mayBeAbstract() const; 1695 1696 /// Determine whether it's impossible for a class to be derived from this 1697 /// class. This is best-effort, and may conservatively return false. 1698 bool isEffectivelyFinal() const; 1699 1700 /// If this is the closure type of a lambda expression, retrieve the 1701 /// number to be used for name mangling in the Itanium C++ ABI. 1702 /// 1703 /// Zero indicates that this closure type has internal linkage, so the 1704 /// mangling number does not matter, while a non-zero value indicates which 1705 /// lambda expression this is in this particular context. getLambdaManglingNumber()1706 unsigned getLambdaManglingNumber() const { 1707 assert(isLambda() && "Not a lambda closure type!"); 1708 return getLambdaData().ManglingNumber; 1709 } 1710 1711 /// The lambda is known to has internal linkage no matter whether it has name 1712 /// mangling number. hasKnownLambdaInternalLinkage()1713 bool hasKnownLambdaInternalLinkage() const { 1714 assert(isLambda() && "Not a lambda closure type!"); 1715 return getLambdaData().HasKnownInternalLinkage; 1716 } 1717 1718 /// Retrieve the declaration that provides additional context for a 1719 /// lambda, when the normal declaration context is not specific enough. 1720 /// 1721 /// Certain contexts (default arguments of in-class function parameters and 1722 /// the initializers of data members) have separate name mangling rules for 1723 /// lambdas within the Itanium C++ ABI. For these cases, this routine provides 1724 /// the declaration in which the lambda occurs, e.g., the function parameter 1725 /// or the non-static data member. Otherwise, it returns NULL to imply that 1726 /// the declaration context suffices. 1727 Decl *getLambdaContextDecl() const; 1728 1729 /// Set the mangling number and context declaration for a lambda 1730 /// class. 1731 void setLambdaMangling(unsigned ManglingNumber, Decl *ContextDecl, 1732 bool HasKnownInternalLinkage = false) { 1733 assert(isLambda() && "Not a lambda closure type!"); 1734 getLambdaData().ManglingNumber = ManglingNumber; 1735 getLambdaData().ContextDecl = ContextDecl; 1736 getLambdaData().HasKnownInternalLinkage = HasKnownInternalLinkage; 1737 } 1738 1739 /// Set the device side mangling number. 1740 void setDeviceLambdaManglingNumber(unsigned Num) const; 1741 1742 /// Retrieve the device side mangling number. 1743 unsigned getDeviceLambdaManglingNumber() const; 1744 1745 /// Returns the inheritance model used for this record. 1746 MSInheritanceModel getMSInheritanceModel() const; 1747 1748 /// Calculate what the inheritance model would be for this class. 1749 MSInheritanceModel calculateInheritanceModel() const; 1750 1751 /// In the Microsoft C++ ABI, use zero for the field offset of a null data 1752 /// member pointer if we can guarantee that zero is not a valid field offset, 1753 /// or if the member pointer has multiple fields. Polymorphic classes have a 1754 /// vfptr at offset zero, so we can use zero for null. If there are multiple 1755 /// fields, we can use zero even if it is a valid field offset because 1756 /// null-ness testing will check the other fields. 1757 bool nullFieldOffsetIsZero() const; 1758 1759 /// Controls when vtordisps will be emitted if this record is used as a 1760 /// virtual base. 1761 MSVtorDispMode getMSVtorDispMode() const; 1762 1763 /// Determine whether this lambda expression was known to be dependent 1764 /// at the time it was created, even if its context does not appear to be 1765 /// dependent. 1766 /// 1767 /// This flag is a workaround for an issue with parsing, where default 1768 /// arguments are parsed before their enclosing function declarations have 1769 /// been created. This means that any lambda expressions within those 1770 /// default arguments will have as their DeclContext the context enclosing 1771 /// the function declaration, which may be non-dependent even when the 1772 /// function declaration itself is dependent. This flag indicates when we 1773 /// know that the lambda is dependent despite that. isDependentLambda()1774 bool isDependentLambda() const { 1775 return isLambda() && getLambdaData().Dependent; 1776 } 1777 getLambdaTypeInfo()1778 TypeSourceInfo *getLambdaTypeInfo() const { 1779 return getLambdaData().MethodTyInfo; 1780 } 1781 1782 // Determine whether this type is an Interface Like type for 1783 // __interface inheritance purposes. 1784 bool isInterfaceLike() const; 1785 classof(const Decl * D)1786 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)1787 static bool classofKind(Kind K) { 1788 return K >= firstCXXRecord && K <= lastCXXRecord; 1789 } markAbstract()1790 void markAbstract() { data().Abstract = true; } 1791 }; 1792 1793 /// Store information needed for an explicit specifier. 1794 /// Used by CXXDeductionGuideDecl, CXXConstructorDecl and CXXConversionDecl. 1795 class ExplicitSpecifier { 1796 llvm::PointerIntPair<Expr *, 2, ExplicitSpecKind> ExplicitSpec{ 1797 nullptr, ExplicitSpecKind::ResolvedFalse}; 1798 1799 public: 1800 ExplicitSpecifier() = default; ExplicitSpecifier(Expr * Expression,ExplicitSpecKind Kind)1801 ExplicitSpecifier(Expr *Expression, ExplicitSpecKind Kind) 1802 : ExplicitSpec(Expression, Kind) {} getKind()1803 ExplicitSpecKind getKind() const { return ExplicitSpec.getInt(); } getExpr()1804 const Expr *getExpr() const { return ExplicitSpec.getPointer(); } getExpr()1805 Expr *getExpr() { return ExplicitSpec.getPointer(); } 1806 1807 /// Determine if the declaration had an explicit specifier of any kind. isSpecified()1808 bool isSpecified() const { 1809 return ExplicitSpec.getInt() != ExplicitSpecKind::ResolvedFalse || 1810 ExplicitSpec.getPointer(); 1811 } 1812 1813 /// Check for equivalence of explicit specifiers. 1814 /// \return true if the explicit specifier are equivalent, false otherwise. 1815 bool isEquivalent(const ExplicitSpecifier Other) const; 1816 /// Determine whether this specifier is known to correspond to an explicit 1817 /// declaration. Returns false if the specifier is absent or has an 1818 /// expression that is value-dependent or evaluates to false. isExplicit()1819 bool isExplicit() const { 1820 return ExplicitSpec.getInt() == ExplicitSpecKind::ResolvedTrue; 1821 } 1822 /// Determine if the explicit specifier is invalid. 1823 /// This state occurs after a substitution failures. isInvalid()1824 bool isInvalid() const { 1825 return ExplicitSpec.getInt() == ExplicitSpecKind::Unresolved && 1826 !ExplicitSpec.getPointer(); 1827 } setKind(ExplicitSpecKind Kind)1828 void setKind(ExplicitSpecKind Kind) { ExplicitSpec.setInt(Kind); } setExpr(Expr * E)1829 void setExpr(Expr *E) { ExplicitSpec.setPointer(E); } 1830 // Retrieve the explicit specifier in the given declaration, if any. 1831 static ExplicitSpecifier getFromDecl(FunctionDecl *Function); getFromDecl(const FunctionDecl * Function)1832 static const ExplicitSpecifier getFromDecl(const FunctionDecl *Function) { 1833 return getFromDecl(const_cast<FunctionDecl *>(Function)); 1834 } Invalid()1835 static ExplicitSpecifier Invalid() { 1836 return ExplicitSpecifier(nullptr, ExplicitSpecKind::Unresolved); 1837 } 1838 }; 1839 1840 /// Represents a C++ deduction guide declaration. 1841 /// 1842 /// \code 1843 /// template<typename T> struct A { A(); A(T); }; 1844 /// A() -> A<int>; 1845 /// \endcode 1846 /// 1847 /// In this example, there will be an explicit deduction guide from the 1848 /// second line, and implicit deduction guide templates synthesized from 1849 /// the constructors of \c A. 1850 class CXXDeductionGuideDecl : public FunctionDecl { 1851 void anchor() override; 1852 1853 private: CXXDeductionGuideDecl(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,ExplicitSpecifier ES,const DeclarationNameInfo & NameInfo,QualType T,TypeSourceInfo * TInfo,SourceLocation EndLocation,CXXConstructorDecl * Ctor)1854 CXXDeductionGuideDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, 1855 ExplicitSpecifier ES, 1856 const DeclarationNameInfo &NameInfo, QualType T, 1857 TypeSourceInfo *TInfo, SourceLocation EndLocation, 1858 CXXConstructorDecl *Ctor) 1859 : FunctionDecl(CXXDeductionGuide, C, DC, StartLoc, NameInfo, T, TInfo, 1860 SC_None, false, ConstexprSpecKind::Unspecified), 1861 Ctor(Ctor), ExplicitSpec(ES) { 1862 if (EndLocation.isValid()) 1863 setRangeEnd(EndLocation); 1864 setIsCopyDeductionCandidate(false); 1865 } 1866 1867 CXXConstructorDecl *Ctor; 1868 ExplicitSpecifier ExplicitSpec; setExplicitSpecifier(ExplicitSpecifier ES)1869 void setExplicitSpecifier(ExplicitSpecifier ES) { ExplicitSpec = ES; } 1870 1871 public: 1872 friend class ASTDeclReader; 1873 friend class ASTDeclWriter; 1874 1875 static CXXDeductionGuideDecl * 1876 Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, 1877 ExplicitSpecifier ES, const DeclarationNameInfo &NameInfo, QualType T, 1878 TypeSourceInfo *TInfo, SourceLocation EndLocation, 1879 CXXConstructorDecl *Ctor = nullptr); 1880 1881 static CXXDeductionGuideDecl *CreateDeserialized(ASTContext &C, unsigned ID); 1882 getExplicitSpecifier()1883 ExplicitSpecifier getExplicitSpecifier() { return ExplicitSpec; } getExplicitSpecifier()1884 const ExplicitSpecifier getExplicitSpecifier() const { return ExplicitSpec; } 1885 1886 /// Return true if the declartion is already resolved to be explicit. isExplicit()1887 bool isExplicit() const { return ExplicitSpec.isExplicit(); } 1888 1889 /// Get the template for which this guide performs deduction. getDeducedTemplate()1890 TemplateDecl *getDeducedTemplate() const { 1891 return getDeclName().getCXXDeductionGuideTemplate(); 1892 } 1893 1894 /// Get the constructor from which this deduction guide was generated, if 1895 /// this is an implicit deduction guide. getCorrespondingConstructor()1896 CXXConstructorDecl *getCorrespondingConstructor() const { 1897 return Ctor; 1898 } 1899 1900 void setIsCopyDeductionCandidate(bool isCDC = true) { 1901 FunctionDeclBits.IsCopyDeductionCandidate = isCDC; 1902 } 1903 isCopyDeductionCandidate()1904 bool isCopyDeductionCandidate() const { 1905 return FunctionDeclBits.IsCopyDeductionCandidate; 1906 } 1907 1908 // Implement isa/cast/dyncast/etc. classof(const Decl * D)1909 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)1910 static bool classofKind(Kind K) { return K == CXXDeductionGuide; } 1911 }; 1912 1913 /// \brief Represents the body of a requires-expression. 1914 /// 1915 /// This decl exists merely to serve as the DeclContext for the local 1916 /// parameters of the requires expression as well as other declarations inside 1917 /// it. 1918 /// 1919 /// \code 1920 /// template<typename T> requires requires (T t) { {t++} -> regular; } 1921 /// \endcode 1922 /// 1923 /// In this example, a RequiresExpr object will be generated for the expression, 1924 /// and a RequiresExprBodyDecl will be created to hold the parameter t and the 1925 /// template argument list imposed by the compound requirement. 1926 class RequiresExprBodyDecl : public Decl, public DeclContext { RequiresExprBodyDecl(ASTContext & C,DeclContext * DC,SourceLocation StartLoc)1927 RequiresExprBodyDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc) 1928 : Decl(RequiresExprBody, DC, StartLoc), DeclContext(RequiresExprBody) {} 1929 1930 public: 1931 friend class ASTDeclReader; 1932 friend class ASTDeclWriter; 1933 1934 static RequiresExprBodyDecl *Create(ASTContext &C, DeclContext *DC, 1935 SourceLocation StartLoc); 1936 1937 static RequiresExprBodyDecl *CreateDeserialized(ASTContext &C, unsigned ID); 1938 1939 // Implement isa/cast/dyncast/etc. classof(const Decl * D)1940 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)1941 static bool classofKind(Kind K) { return K == RequiresExprBody; } 1942 }; 1943 1944 /// Represents a static or instance method of a struct/union/class. 1945 /// 1946 /// In the terminology of the C++ Standard, these are the (static and 1947 /// non-static) member functions, whether virtual or not. 1948 class CXXMethodDecl : public FunctionDecl { 1949 void anchor() override; 1950 1951 protected: 1952 CXXMethodDecl(Kind DK, ASTContext &C, CXXRecordDecl *RD, 1953 SourceLocation StartLoc, const DeclarationNameInfo &NameInfo, 1954 QualType T, TypeSourceInfo *TInfo, StorageClass SC, 1955 bool isInline, ConstexprSpecKind ConstexprKind, 1956 SourceLocation EndLocation, 1957 Expr *TrailingRequiresClause = nullptr) FunctionDecl(DK,C,RD,StartLoc,NameInfo,T,TInfo,SC,isInline,ConstexprKind,TrailingRequiresClause)1958 : FunctionDecl(DK, C, RD, StartLoc, NameInfo, T, TInfo, SC, isInline, 1959 ConstexprKind, TrailingRequiresClause) { 1960 if (EndLocation.isValid()) 1961 setRangeEnd(EndLocation); 1962 } 1963 1964 public: 1965 static CXXMethodDecl *Create(ASTContext &C, CXXRecordDecl *RD, 1966 SourceLocation StartLoc, 1967 const DeclarationNameInfo &NameInfo, QualType T, 1968 TypeSourceInfo *TInfo, StorageClass SC, 1969 bool isInline, ConstexprSpecKind ConstexprKind, 1970 SourceLocation EndLocation, 1971 Expr *TrailingRequiresClause = nullptr); 1972 1973 static CXXMethodDecl *CreateDeserialized(ASTContext &C, unsigned ID); 1974 1975 bool isStatic() const; isInstance()1976 bool isInstance() const { return !isStatic(); } 1977 1978 /// Returns true if the given operator is implicitly static in a record 1979 /// context. isStaticOverloadedOperator(OverloadedOperatorKind OOK)1980 static bool isStaticOverloadedOperator(OverloadedOperatorKind OOK) { 1981 // [class.free]p1: 1982 // Any allocation function for a class T is a static member 1983 // (even if not explicitly declared static). 1984 // [class.free]p6 Any deallocation function for a class X is a static member 1985 // (even if not explicitly declared static). 1986 return OOK == OO_New || OOK == OO_Array_New || OOK == OO_Delete || 1987 OOK == OO_Array_Delete; 1988 } 1989 isConst()1990 bool isConst() const { return getType()->castAs<FunctionType>()->isConst(); } isVolatile()1991 bool isVolatile() const { return getType()->castAs<FunctionType>()->isVolatile(); } 1992 isVirtual()1993 bool isVirtual() const { 1994 CXXMethodDecl *CD = const_cast<CXXMethodDecl*>(this)->getCanonicalDecl(); 1995 1996 // Member function is virtual if it is marked explicitly so, or if it is 1997 // declared in __interface -- then it is automatically pure virtual. 1998 if (CD->isVirtualAsWritten() || CD->isPure()) 1999 return true; 2000 2001 return CD->size_overridden_methods() != 0; 2002 } 2003 2004 /// If it's possible to devirtualize a call to this method, return the called 2005 /// function. Otherwise, return null. 2006 2007 /// \param Base The object on which this virtual function is called. 2008 /// \param IsAppleKext True if we are compiling for Apple kext. 2009 CXXMethodDecl *getDevirtualizedMethod(const Expr *Base, bool IsAppleKext); 2010 getDevirtualizedMethod(const Expr * Base,bool IsAppleKext)2011 const CXXMethodDecl *getDevirtualizedMethod(const Expr *Base, 2012 bool IsAppleKext) const { 2013 return const_cast<CXXMethodDecl *>(this)->getDevirtualizedMethod( 2014 Base, IsAppleKext); 2015 } 2016 2017 /// Determine whether this is a usual deallocation function (C++ 2018 /// [basic.stc.dynamic.deallocation]p2), which is an overloaded delete or 2019 /// delete[] operator with a particular signature. Populates \p PreventedBy 2020 /// with the declarations of the functions of the same kind if they were the 2021 /// reason for this function returning false. This is used by 2022 /// Sema::isUsualDeallocationFunction to reconsider the answer based on the 2023 /// context. 2024 bool isUsualDeallocationFunction( 2025 SmallVectorImpl<const FunctionDecl *> &PreventedBy) const; 2026 2027 /// Determine whether this is a copy-assignment operator, regardless 2028 /// of whether it was declared implicitly or explicitly. 2029 bool isCopyAssignmentOperator() const; 2030 2031 /// Determine whether this is a move assignment operator. 2032 bool isMoveAssignmentOperator() const; 2033 getCanonicalDecl()2034 CXXMethodDecl *getCanonicalDecl() override { 2035 return cast<CXXMethodDecl>(FunctionDecl::getCanonicalDecl()); 2036 } getCanonicalDecl()2037 const CXXMethodDecl *getCanonicalDecl() const { 2038 return const_cast<CXXMethodDecl*>(this)->getCanonicalDecl(); 2039 } 2040 getMostRecentDecl()2041 CXXMethodDecl *getMostRecentDecl() { 2042 return cast<CXXMethodDecl>( 2043 static_cast<FunctionDecl *>(this)->getMostRecentDecl()); 2044 } getMostRecentDecl()2045 const CXXMethodDecl *getMostRecentDecl() const { 2046 return const_cast<CXXMethodDecl*>(this)->getMostRecentDecl(); 2047 } 2048 2049 void addOverriddenMethod(const CXXMethodDecl *MD); 2050 2051 using method_iterator = const CXXMethodDecl *const *; 2052 2053 method_iterator begin_overridden_methods() const; 2054 method_iterator end_overridden_methods() const; 2055 unsigned size_overridden_methods() const; 2056 2057 using overridden_method_range = llvm::iterator_range< 2058 llvm::TinyPtrVector<const CXXMethodDecl *>::const_iterator>; 2059 2060 overridden_method_range overridden_methods() const; 2061 2062 /// Return the parent of this method declaration, which 2063 /// is the class in which this method is defined. getParent()2064 const CXXRecordDecl *getParent() const { 2065 return cast<CXXRecordDecl>(FunctionDecl::getParent()); 2066 } 2067 2068 /// Return the parent of this method declaration, which 2069 /// is the class in which this method is defined. getParent()2070 CXXRecordDecl *getParent() { 2071 return const_cast<CXXRecordDecl *>( 2072 cast<CXXRecordDecl>(FunctionDecl::getParent())); 2073 } 2074 2075 /// Return the type of the \c this pointer. 2076 /// 2077 /// Should only be called for instance (i.e., non-static) methods. Note 2078 /// that for the call operator of a lambda closure type, this returns the 2079 /// desugared 'this' type (a pointer to the closure type), not the captured 2080 /// 'this' type. 2081 QualType getThisType() const; 2082 2083 /// Return the type of the object pointed by \c this. 2084 /// 2085 /// See getThisType() for usage restriction. 2086 QualType getThisObjectType() const; 2087 2088 static QualType getThisType(const FunctionProtoType *FPT, 2089 const CXXRecordDecl *Decl); 2090 2091 static QualType getThisObjectType(const FunctionProtoType *FPT, 2092 const CXXRecordDecl *Decl); 2093 getMethodQualifiers()2094 Qualifiers getMethodQualifiers() const { 2095 return getType()->castAs<FunctionProtoType>()->getMethodQuals(); 2096 } 2097 2098 /// Retrieve the ref-qualifier associated with this method. 2099 /// 2100 /// In the following example, \c f() has an lvalue ref-qualifier, \c g() 2101 /// has an rvalue ref-qualifier, and \c h() has no ref-qualifier. 2102 /// @code 2103 /// struct X { 2104 /// void f() &; 2105 /// void g() &&; 2106 /// void h(); 2107 /// }; 2108 /// @endcode getRefQualifier()2109 RefQualifierKind getRefQualifier() const { 2110 return getType()->castAs<FunctionProtoType>()->getRefQualifier(); 2111 } 2112 2113 bool hasInlineBody() const; 2114 2115 /// Determine whether this is a lambda closure type's static member 2116 /// function that is used for the result of the lambda's conversion to 2117 /// function pointer (for a lambda with no captures). 2118 /// 2119 /// The function itself, if used, will have a placeholder body that will be 2120 /// supplied by IR generation to either forward to the function call operator 2121 /// or clone the function call operator. 2122 bool isLambdaStaticInvoker() const; 2123 2124 /// Find the method in \p RD that corresponds to this one. 2125 /// 2126 /// Find if \p RD or one of the classes it inherits from override this method. 2127 /// If so, return it. \p RD is assumed to be a subclass of the class defining 2128 /// this method (or be the class itself), unless \p MayBeBase is set to true. 2129 CXXMethodDecl * 2130 getCorrespondingMethodInClass(const CXXRecordDecl *RD, 2131 bool MayBeBase = false); 2132 2133 const CXXMethodDecl * 2134 getCorrespondingMethodInClass(const CXXRecordDecl *RD, 2135 bool MayBeBase = false) const { 2136 return const_cast<CXXMethodDecl *>(this) 2137 ->getCorrespondingMethodInClass(RD, MayBeBase); 2138 } 2139 2140 /// Find if \p RD declares a function that overrides this function, and if so, 2141 /// return it. Does not search base classes. 2142 CXXMethodDecl *getCorrespondingMethodDeclaredInClass(const CXXRecordDecl *RD, 2143 bool MayBeBase = false); 2144 const CXXMethodDecl * 2145 getCorrespondingMethodDeclaredInClass(const CXXRecordDecl *RD, 2146 bool MayBeBase = false) const { 2147 return const_cast<CXXMethodDecl *>(this) 2148 ->getCorrespondingMethodDeclaredInClass(RD, MayBeBase); 2149 } 2150 2151 // Implement isa/cast/dyncast/etc. classof(const Decl * D)2152 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)2153 static bool classofKind(Kind K) { 2154 return K >= firstCXXMethod && K <= lastCXXMethod; 2155 } 2156 }; 2157 2158 /// Represents a C++ base or member initializer. 2159 /// 2160 /// This is part of a constructor initializer that 2161 /// initializes one non-static member variable or one base class. For 2162 /// example, in the following, both 'A(a)' and 'f(3.14159)' are member 2163 /// initializers: 2164 /// 2165 /// \code 2166 /// class A { }; 2167 /// class B : public A { 2168 /// float f; 2169 /// public: 2170 /// B(A& a) : A(a), f(3.14159) { } 2171 /// }; 2172 /// \endcode 2173 class CXXCtorInitializer final { 2174 /// Either the base class name/delegating constructor type (stored as 2175 /// a TypeSourceInfo*), an normal field (FieldDecl), or an anonymous field 2176 /// (IndirectFieldDecl*) being initialized. 2177 llvm::PointerUnion<TypeSourceInfo *, FieldDecl *, IndirectFieldDecl *> 2178 Initializee; 2179 2180 /// The argument used to initialize the base or member, which may 2181 /// end up constructing an object (when multiple arguments are involved). 2182 Stmt *Init; 2183 2184 /// The source location for the field name or, for a base initializer 2185 /// pack expansion, the location of the ellipsis. 2186 /// 2187 /// In the case of a delegating 2188 /// constructor, it will still include the type's source location as the 2189 /// Initializee points to the CXXConstructorDecl (to allow loop detection). 2190 SourceLocation MemberOrEllipsisLocation; 2191 2192 /// Location of the left paren of the ctor-initializer. 2193 SourceLocation LParenLoc; 2194 2195 /// Location of the right paren of the ctor-initializer. 2196 SourceLocation RParenLoc; 2197 2198 /// If the initializee is a type, whether that type makes this 2199 /// a delegating initialization. 2200 unsigned IsDelegating : 1; 2201 2202 /// If the initializer is a base initializer, this keeps track 2203 /// of whether the base is virtual or not. 2204 unsigned IsVirtual : 1; 2205 2206 /// Whether or not the initializer is explicitly written 2207 /// in the sources. 2208 unsigned IsWritten : 1; 2209 2210 /// If IsWritten is true, then this number keeps track of the textual order 2211 /// of this initializer in the original sources, counting from 0. 2212 unsigned SourceOrder : 13; 2213 2214 public: 2215 /// Creates a new base-class initializer. 2216 explicit 2217 CXXCtorInitializer(ASTContext &Context, TypeSourceInfo *TInfo, bool IsVirtual, 2218 SourceLocation L, Expr *Init, SourceLocation R, 2219 SourceLocation EllipsisLoc); 2220 2221 /// Creates a new member initializer. 2222 explicit 2223 CXXCtorInitializer(ASTContext &Context, FieldDecl *Member, 2224 SourceLocation MemberLoc, SourceLocation L, Expr *Init, 2225 SourceLocation R); 2226 2227 /// Creates a new anonymous field initializer. 2228 explicit 2229 CXXCtorInitializer(ASTContext &Context, IndirectFieldDecl *Member, 2230 SourceLocation MemberLoc, SourceLocation L, Expr *Init, 2231 SourceLocation R); 2232 2233 /// Creates a new delegating initializer. 2234 explicit 2235 CXXCtorInitializer(ASTContext &Context, TypeSourceInfo *TInfo, 2236 SourceLocation L, Expr *Init, SourceLocation R); 2237 2238 /// \return Unique reproducible object identifier. 2239 int64_t getID(const ASTContext &Context) const; 2240 2241 /// Determine whether this initializer is initializing a base class. isBaseInitializer()2242 bool isBaseInitializer() const { 2243 return Initializee.is<TypeSourceInfo*>() && !IsDelegating; 2244 } 2245 2246 /// Determine whether this initializer is initializing a non-static 2247 /// data member. isMemberInitializer()2248 bool isMemberInitializer() const { return Initializee.is<FieldDecl*>(); } 2249 isAnyMemberInitializer()2250 bool isAnyMemberInitializer() const { 2251 return isMemberInitializer() || isIndirectMemberInitializer(); 2252 } 2253 isIndirectMemberInitializer()2254 bool isIndirectMemberInitializer() const { 2255 return Initializee.is<IndirectFieldDecl*>(); 2256 } 2257 2258 /// Determine whether this initializer is an implicit initializer 2259 /// generated for a field with an initializer defined on the member 2260 /// declaration. 2261 /// 2262 /// In-class member initializers (also known as "non-static data member 2263 /// initializations", NSDMIs) were introduced in C++11. isInClassMemberInitializer()2264 bool isInClassMemberInitializer() const { 2265 return Init->getStmtClass() == Stmt::CXXDefaultInitExprClass; 2266 } 2267 2268 /// Determine whether this initializer is creating a delegating 2269 /// constructor. isDelegatingInitializer()2270 bool isDelegatingInitializer() const { 2271 return Initializee.is<TypeSourceInfo*>() && IsDelegating; 2272 } 2273 2274 /// Determine whether this initializer is a pack expansion. isPackExpansion()2275 bool isPackExpansion() const { 2276 return isBaseInitializer() && MemberOrEllipsisLocation.isValid(); 2277 } 2278 2279 // For a pack expansion, returns the location of the ellipsis. getEllipsisLoc()2280 SourceLocation getEllipsisLoc() const { 2281 if (!isPackExpansion()) 2282 return {}; 2283 return MemberOrEllipsisLocation; 2284 } 2285 2286 /// If this is a base class initializer, returns the type of the 2287 /// base class with location information. Otherwise, returns an NULL 2288 /// type location. 2289 TypeLoc getBaseClassLoc() const; 2290 2291 /// If this is a base class initializer, returns the type of the base class. 2292 /// Otherwise, returns null. 2293 const Type *getBaseClass() const; 2294 2295 /// Returns whether the base is virtual or not. isBaseVirtual()2296 bool isBaseVirtual() const { 2297 assert(isBaseInitializer() && "Must call this on base initializer!"); 2298 2299 return IsVirtual; 2300 } 2301 2302 /// Returns the declarator information for a base class or delegating 2303 /// initializer. getTypeSourceInfo()2304 TypeSourceInfo *getTypeSourceInfo() const { 2305 return Initializee.dyn_cast<TypeSourceInfo *>(); 2306 } 2307 2308 /// If this is a member initializer, returns the declaration of the 2309 /// non-static data member being initialized. Otherwise, returns null. getMember()2310 FieldDecl *getMember() const { 2311 if (isMemberInitializer()) 2312 return Initializee.get<FieldDecl*>(); 2313 return nullptr; 2314 } 2315 getAnyMember()2316 FieldDecl *getAnyMember() const { 2317 if (isMemberInitializer()) 2318 return Initializee.get<FieldDecl*>(); 2319 if (isIndirectMemberInitializer()) 2320 return Initializee.get<IndirectFieldDecl*>()->getAnonField(); 2321 return nullptr; 2322 } 2323 getIndirectMember()2324 IndirectFieldDecl *getIndirectMember() const { 2325 if (isIndirectMemberInitializer()) 2326 return Initializee.get<IndirectFieldDecl*>(); 2327 return nullptr; 2328 } 2329 getMemberLocation()2330 SourceLocation getMemberLocation() const { 2331 return MemberOrEllipsisLocation; 2332 } 2333 2334 /// Determine the source location of the initializer. 2335 SourceLocation getSourceLocation() const; 2336 2337 /// Determine the source range covering the entire initializer. 2338 SourceRange getSourceRange() const LLVM_READONLY; 2339 2340 /// Determine whether this initializer is explicitly written 2341 /// in the source code. isWritten()2342 bool isWritten() const { return IsWritten; } 2343 2344 /// Return the source position of the initializer, counting from 0. 2345 /// If the initializer was implicit, -1 is returned. getSourceOrder()2346 int getSourceOrder() const { 2347 return IsWritten ? static_cast<int>(SourceOrder) : -1; 2348 } 2349 2350 /// Set the source order of this initializer. 2351 /// 2352 /// This can only be called once for each initializer; it cannot be called 2353 /// on an initializer having a positive number of (implicit) array indices. 2354 /// 2355 /// This assumes that the initializer was written in the source code, and 2356 /// ensures that isWritten() returns true. setSourceOrder(int Pos)2357 void setSourceOrder(int Pos) { 2358 assert(!IsWritten && 2359 "setSourceOrder() used on implicit initializer"); 2360 assert(SourceOrder == 0 && 2361 "calling twice setSourceOrder() on the same initializer"); 2362 assert(Pos >= 0 && 2363 "setSourceOrder() used to make an initializer implicit"); 2364 IsWritten = true; 2365 SourceOrder = static_cast<unsigned>(Pos); 2366 } 2367 getLParenLoc()2368 SourceLocation getLParenLoc() const { return LParenLoc; } getRParenLoc()2369 SourceLocation getRParenLoc() const { return RParenLoc; } 2370 2371 /// Get the initializer. getInit()2372 Expr *getInit() const { return static_cast<Expr *>(Init); } 2373 }; 2374 2375 /// Description of a constructor that was inherited from a base class. 2376 class InheritedConstructor { 2377 ConstructorUsingShadowDecl *Shadow = nullptr; 2378 CXXConstructorDecl *BaseCtor = nullptr; 2379 2380 public: 2381 InheritedConstructor() = default; InheritedConstructor(ConstructorUsingShadowDecl * Shadow,CXXConstructorDecl * BaseCtor)2382 InheritedConstructor(ConstructorUsingShadowDecl *Shadow, 2383 CXXConstructorDecl *BaseCtor) 2384 : Shadow(Shadow), BaseCtor(BaseCtor) {} 2385 2386 explicit operator bool() const { return Shadow; } 2387 getShadowDecl()2388 ConstructorUsingShadowDecl *getShadowDecl() const { return Shadow; } getConstructor()2389 CXXConstructorDecl *getConstructor() const { return BaseCtor; } 2390 }; 2391 2392 /// Represents a C++ constructor within a class. 2393 /// 2394 /// For example: 2395 /// 2396 /// \code 2397 /// class X { 2398 /// public: 2399 /// explicit X(int); // represented by a CXXConstructorDecl. 2400 /// }; 2401 /// \endcode 2402 class CXXConstructorDecl final 2403 : public CXXMethodDecl, 2404 private llvm::TrailingObjects<CXXConstructorDecl, InheritedConstructor, 2405 ExplicitSpecifier> { 2406 // This class stores some data in DeclContext::CXXConstructorDeclBits 2407 // to save some space. Use the provided accessors to access it. 2408 2409 /// \name Support for base and member initializers. 2410 /// \{ 2411 /// The arguments used to initialize the base or member. 2412 LazyCXXCtorInitializersPtr CtorInitializers; 2413 2414 CXXConstructorDecl(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2415 const DeclarationNameInfo &NameInfo, QualType T, 2416 TypeSourceInfo *TInfo, ExplicitSpecifier ES, bool isInline, 2417 bool isImplicitlyDeclared, ConstexprSpecKind ConstexprKind, 2418 InheritedConstructor Inherited, 2419 Expr *TrailingRequiresClause); 2420 2421 void anchor() override; 2422 numTrailingObjects(OverloadToken<InheritedConstructor>)2423 size_t numTrailingObjects(OverloadToken<InheritedConstructor>) const { 2424 return CXXConstructorDeclBits.IsInheritingConstructor; 2425 } numTrailingObjects(OverloadToken<ExplicitSpecifier>)2426 size_t numTrailingObjects(OverloadToken<ExplicitSpecifier>) const { 2427 return CXXConstructorDeclBits.HasTrailingExplicitSpecifier; 2428 } 2429 getExplicitSpecifierInternal()2430 ExplicitSpecifier getExplicitSpecifierInternal() const { 2431 if (CXXConstructorDeclBits.HasTrailingExplicitSpecifier) 2432 return *getTrailingObjects<ExplicitSpecifier>(); 2433 return ExplicitSpecifier( 2434 nullptr, CXXConstructorDeclBits.IsSimpleExplicit 2435 ? ExplicitSpecKind::ResolvedTrue 2436 : ExplicitSpecKind::ResolvedFalse); 2437 } 2438 2439 enum TrailingAllocKind { 2440 TAKInheritsConstructor = 1, 2441 TAKHasTailExplicit = 1 << 1, 2442 }; 2443 getTrailingAllocKind()2444 uint64_t getTrailingAllocKind() const { 2445 return numTrailingObjects(OverloadToken<InheritedConstructor>()) | 2446 (numTrailingObjects(OverloadToken<ExplicitSpecifier>()) << 1); 2447 } 2448 2449 public: 2450 friend class ASTDeclReader; 2451 friend class ASTDeclWriter; 2452 friend TrailingObjects; 2453 2454 static CXXConstructorDecl *CreateDeserialized(ASTContext &C, unsigned ID, 2455 uint64_t AllocKind); 2456 static CXXConstructorDecl * 2457 Create(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2458 const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo, 2459 ExplicitSpecifier ES, bool isInline, bool isImplicitlyDeclared, 2460 ConstexprSpecKind ConstexprKind, 2461 InheritedConstructor Inherited = InheritedConstructor(), 2462 Expr *TrailingRequiresClause = nullptr); 2463 setExplicitSpecifier(ExplicitSpecifier ES)2464 void setExplicitSpecifier(ExplicitSpecifier ES) { 2465 assert((!ES.getExpr() || 2466 CXXConstructorDeclBits.HasTrailingExplicitSpecifier) && 2467 "cannot set this explicit specifier. no trail-allocated space for " 2468 "explicit"); 2469 if (ES.getExpr()) 2470 *getCanonicalDecl()->getTrailingObjects<ExplicitSpecifier>() = ES; 2471 else 2472 CXXConstructorDeclBits.IsSimpleExplicit = ES.isExplicit(); 2473 } 2474 getExplicitSpecifier()2475 ExplicitSpecifier getExplicitSpecifier() { 2476 return getCanonicalDecl()->getExplicitSpecifierInternal(); 2477 } getExplicitSpecifier()2478 const ExplicitSpecifier getExplicitSpecifier() const { 2479 return getCanonicalDecl()->getExplicitSpecifierInternal(); 2480 } 2481 2482 /// Return true if the declartion is already resolved to be explicit. isExplicit()2483 bool isExplicit() const { return getExplicitSpecifier().isExplicit(); } 2484 2485 /// Iterates through the member/base initializer list. 2486 using init_iterator = CXXCtorInitializer **; 2487 2488 /// Iterates through the member/base initializer list. 2489 using init_const_iterator = CXXCtorInitializer *const *; 2490 2491 using init_range = llvm::iterator_range<init_iterator>; 2492 using init_const_range = llvm::iterator_range<init_const_iterator>; 2493 inits()2494 init_range inits() { return init_range(init_begin(), init_end()); } inits()2495 init_const_range inits() const { 2496 return init_const_range(init_begin(), init_end()); 2497 } 2498 2499 /// Retrieve an iterator to the first initializer. init_begin()2500 init_iterator init_begin() { 2501 const auto *ConstThis = this; 2502 return const_cast<init_iterator>(ConstThis->init_begin()); 2503 } 2504 2505 /// Retrieve an iterator to the first initializer. 2506 init_const_iterator init_begin() const; 2507 2508 /// Retrieve an iterator past the last initializer. init_end()2509 init_iterator init_end() { 2510 return init_begin() + getNumCtorInitializers(); 2511 } 2512 2513 /// Retrieve an iterator past the last initializer. init_end()2514 init_const_iterator init_end() const { 2515 return init_begin() + getNumCtorInitializers(); 2516 } 2517 2518 using init_reverse_iterator = std::reverse_iterator<init_iterator>; 2519 using init_const_reverse_iterator = 2520 std::reverse_iterator<init_const_iterator>; 2521 init_rbegin()2522 init_reverse_iterator init_rbegin() { 2523 return init_reverse_iterator(init_end()); 2524 } init_rbegin()2525 init_const_reverse_iterator init_rbegin() const { 2526 return init_const_reverse_iterator(init_end()); 2527 } 2528 init_rend()2529 init_reverse_iterator init_rend() { 2530 return init_reverse_iterator(init_begin()); 2531 } init_rend()2532 init_const_reverse_iterator init_rend() const { 2533 return init_const_reverse_iterator(init_begin()); 2534 } 2535 2536 /// Determine the number of arguments used to initialize the member 2537 /// or base. getNumCtorInitializers()2538 unsigned getNumCtorInitializers() const { 2539 return CXXConstructorDeclBits.NumCtorInitializers; 2540 } 2541 setNumCtorInitializers(unsigned numCtorInitializers)2542 void setNumCtorInitializers(unsigned numCtorInitializers) { 2543 CXXConstructorDeclBits.NumCtorInitializers = numCtorInitializers; 2544 // This assert added because NumCtorInitializers is stored 2545 // in CXXConstructorDeclBits as a bitfield and its width has 2546 // been shrunk from 32 bits to fit into CXXConstructorDeclBitfields. 2547 assert(CXXConstructorDeclBits.NumCtorInitializers == 2548 numCtorInitializers && "NumCtorInitializers overflow!"); 2549 } 2550 setCtorInitializers(CXXCtorInitializer ** Initializers)2551 void setCtorInitializers(CXXCtorInitializer **Initializers) { 2552 CtorInitializers = Initializers; 2553 } 2554 2555 /// Determine whether this constructor is a delegating constructor. isDelegatingConstructor()2556 bool isDelegatingConstructor() const { 2557 return (getNumCtorInitializers() == 1) && 2558 init_begin()[0]->isDelegatingInitializer(); 2559 } 2560 2561 /// When this constructor delegates to another, retrieve the target. 2562 CXXConstructorDecl *getTargetConstructor() const; 2563 2564 /// Whether this constructor is a default 2565 /// constructor (C++ [class.ctor]p5), which can be used to 2566 /// default-initialize a class of this type. 2567 bool isDefaultConstructor() const; 2568 2569 /// Whether this constructor is a copy constructor (C++ [class.copy]p2, 2570 /// which can be used to copy the class. 2571 /// 2572 /// \p TypeQuals will be set to the qualifiers on the 2573 /// argument type. For example, \p TypeQuals would be set to \c 2574 /// Qualifiers::Const for the following copy constructor: 2575 /// 2576 /// \code 2577 /// class X { 2578 /// public: 2579 /// X(const X&); 2580 /// }; 2581 /// \endcode 2582 bool isCopyConstructor(unsigned &TypeQuals) const; 2583 2584 /// Whether this constructor is a copy 2585 /// constructor (C++ [class.copy]p2, which can be used to copy the 2586 /// class. isCopyConstructor()2587 bool isCopyConstructor() const { 2588 unsigned TypeQuals = 0; 2589 return isCopyConstructor(TypeQuals); 2590 } 2591 2592 /// Determine whether this constructor is a move constructor 2593 /// (C++11 [class.copy]p3), which can be used to move values of the class. 2594 /// 2595 /// \param TypeQuals If this constructor is a move constructor, will be set 2596 /// to the type qualifiers on the referent of the first parameter's type. 2597 bool isMoveConstructor(unsigned &TypeQuals) const; 2598 2599 /// Determine whether this constructor is a move constructor 2600 /// (C++11 [class.copy]p3), which can be used to move values of the class. isMoveConstructor()2601 bool isMoveConstructor() const { 2602 unsigned TypeQuals = 0; 2603 return isMoveConstructor(TypeQuals); 2604 } 2605 2606 /// Determine whether this is a copy or move constructor. 2607 /// 2608 /// \param TypeQuals Will be set to the type qualifiers on the reference 2609 /// parameter, if in fact this is a copy or move constructor. 2610 bool isCopyOrMoveConstructor(unsigned &TypeQuals) const; 2611 2612 /// Determine whether this a copy or move constructor. isCopyOrMoveConstructor()2613 bool isCopyOrMoveConstructor() const { 2614 unsigned Quals; 2615 return isCopyOrMoveConstructor(Quals); 2616 } 2617 2618 /// Whether this constructor is a 2619 /// converting constructor (C++ [class.conv.ctor]), which can be 2620 /// used for user-defined conversions. 2621 bool isConvertingConstructor(bool AllowExplicit) const; 2622 2623 /// Determine whether this is a member template specialization that 2624 /// would copy the object to itself. Such constructors are never used to copy 2625 /// an object. 2626 bool isSpecializationCopyingObject() const; 2627 2628 /// Determine whether this is an implicit constructor synthesized to 2629 /// model a call to a constructor inherited from a base class. isInheritingConstructor()2630 bool isInheritingConstructor() const { 2631 return CXXConstructorDeclBits.IsInheritingConstructor; 2632 } 2633 2634 /// State that this is an implicit constructor synthesized to 2635 /// model a call to a constructor inherited from a base class. 2636 void setInheritingConstructor(bool isIC = true) { 2637 CXXConstructorDeclBits.IsInheritingConstructor = isIC; 2638 } 2639 2640 /// Get the constructor that this inheriting constructor is based on. getInheritedConstructor()2641 InheritedConstructor getInheritedConstructor() const { 2642 return isInheritingConstructor() ? 2643 *getTrailingObjects<InheritedConstructor>() : InheritedConstructor(); 2644 } 2645 getCanonicalDecl()2646 CXXConstructorDecl *getCanonicalDecl() override { 2647 return cast<CXXConstructorDecl>(FunctionDecl::getCanonicalDecl()); 2648 } getCanonicalDecl()2649 const CXXConstructorDecl *getCanonicalDecl() const { 2650 return const_cast<CXXConstructorDecl*>(this)->getCanonicalDecl(); 2651 } 2652 2653 // Implement isa/cast/dyncast/etc. classof(const Decl * D)2654 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)2655 static bool classofKind(Kind K) { return K == CXXConstructor; } 2656 }; 2657 2658 /// Represents a C++ destructor within a class. 2659 /// 2660 /// For example: 2661 /// 2662 /// \code 2663 /// class X { 2664 /// public: 2665 /// ~X(); // represented by a CXXDestructorDecl. 2666 /// }; 2667 /// \endcode 2668 class CXXDestructorDecl : public CXXMethodDecl { 2669 friend class ASTDeclReader; 2670 friend class ASTDeclWriter; 2671 2672 // FIXME: Don't allocate storage for these except in the first declaration 2673 // of a virtual destructor. 2674 FunctionDecl *OperatorDelete = nullptr; 2675 Expr *OperatorDeleteThisArg = nullptr; 2676 2677 CXXDestructorDecl(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2678 const DeclarationNameInfo &NameInfo, QualType T, 2679 TypeSourceInfo *TInfo, bool isInline, 2680 bool isImplicitlyDeclared, ConstexprSpecKind ConstexprKind, 2681 Expr *TrailingRequiresClause = nullptr) CXXMethodDecl(CXXDestructor,C,RD,StartLoc,NameInfo,T,TInfo,SC_None,isInline,ConstexprKind,SourceLocation (),TrailingRequiresClause)2682 : CXXMethodDecl(CXXDestructor, C, RD, StartLoc, NameInfo, T, TInfo, 2683 SC_None, isInline, ConstexprKind, SourceLocation(), 2684 TrailingRequiresClause) { 2685 setImplicit(isImplicitlyDeclared); 2686 } 2687 2688 void anchor() override; 2689 2690 public: 2691 static CXXDestructorDecl *Create(ASTContext &C, CXXRecordDecl *RD, 2692 SourceLocation StartLoc, 2693 const DeclarationNameInfo &NameInfo, 2694 QualType T, TypeSourceInfo *TInfo, 2695 bool isInline, bool isImplicitlyDeclared, 2696 ConstexprSpecKind ConstexprKind, 2697 Expr *TrailingRequiresClause = nullptr); 2698 static CXXDestructorDecl *CreateDeserialized(ASTContext & C, unsigned ID); 2699 2700 void setOperatorDelete(FunctionDecl *OD, Expr *ThisArg); 2701 getOperatorDelete()2702 const FunctionDecl *getOperatorDelete() const { 2703 return getCanonicalDecl()->OperatorDelete; 2704 } 2705 getOperatorDeleteThisArg()2706 Expr *getOperatorDeleteThisArg() const { 2707 return getCanonicalDecl()->OperatorDeleteThisArg; 2708 } 2709 getCanonicalDecl()2710 CXXDestructorDecl *getCanonicalDecl() override { 2711 return cast<CXXDestructorDecl>(FunctionDecl::getCanonicalDecl()); 2712 } getCanonicalDecl()2713 const CXXDestructorDecl *getCanonicalDecl() const { 2714 return const_cast<CXXDestructorDecl*>(this)->getCanonicalDecl(); 2715 } 2716 2717 // Implement isa/cast/dyncast/etc. classof(const Decl * D)2718 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)2719 static bool classofKind(Kind K) { return K == CXXDestructor; } 2720 }; 2721 2722 /// Represents a C++ conversion function within a class. 2723 /// 2724 /// For example: 2725 /// 2726 /// \code 2727 /// class X { 2728 /// public: 2729 /// operator bool(); 2730 /// }; 2731 /// \endcode 2732 class CXXConversionDecl : public CXXMethodDecl { 2733 CXXConversionDecl(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2734 const DeclarationNameInfo &NameInfo, QualType T, 2735 TypeSourceInfo *TInfo, bool isInline, ExplicitSpecifier ES, 2736 ConstexprSpecKind ConstexprKind, SourceLocation EndLocation, 2737 Expr *TrailingRequiresClause = nullptr) CXXMethodDecl(CXXConversion,C,RD,StartLoc,NameInfo,T,TInfo,SC_None,isInline,ConstexprKind,EndLocation,TrailingRequiresClause)2738 : CXXMethodDecl(CXXConversion, C, RD, StartLoc, NameInfo, T, TInfo, 2739 SC_None, isInline, ConstexprKind, EndLocation, 2740 TrailingRequiresClause), 2741 ExplicitSpec(ES) {} 2742 void anchor() override; 2743 2744 ExplicitSpecifier ExplicitSpec; 2745 2746 public: 2747 friend class ASTDeclReader; 2748 friend class ASTDeclWriter; 2749 2750 static CXXConversionDecl * 2751 Create(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2752 const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo, 2753 bool isInline, ExplicitSpecifier ES, ConstexprSpecKind ConstexprKind, 2754 SourceLocation EndLocation, Expr *TrailingRequiresClause = nullptr); 2755 static CXXConversionDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2756 getExplicitSpecifier()2757 ExplicitSpecifier getExplicitSpecifier() { 2758 return getCanonicalDecl()->ExplicitSpec; 2759 } 2760 getExplicitSpecifier()2761 const ExplicitSpecifier getExplicitSpecifier() const { 2762 return getCanonicalDecl()->ExplicitSpec; 2763 } 2764 2765 /// Return true if the declartion is already resolved to be explicit. isExplicit()2766 bool isExplicit() const { return getExplicitSpecifier().isExplicit(); } setExplicitSpecifier(ExplicitSpecifier ES)2767 void setExplicitSpecifier(ExplicitSpecifier ES) { ExplicitSpec = ES; } 2768 2769 /// Returns the type that this conversion function is converting to. getConversionType()2770 QualType getConversionType() const { 2771 return getType()->castAs<FunctionType>()->getReturnType(); 2772 } 2773 2774 /// Determine whether this conversion function is a conversion from 2775 /// a lambda closure type to a block pointer. 2776 bool isLambdaToBlockPointerConversion() const; 2777 getCanonicalDecl()2778 CXXConversionDecl *getCanonicalDecl() override { 2779 return cast<CXXConversionDecl>(FunctionDecl::getCanonicalDecl()); 2780 } getCanonicalDecl()2781 const CXXConversionDecl *getCanonicalDecl() const { 2782 return const_cast<CXXConversionDecl*>(this)->getCanonicalDecl(); 2783 } 2784 2785 // Implement isa/cast/dyncast/etc. classof(const Decl * D)2786 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)2787 static bool classofKind(Kind K) { return K == CXXConversion; } 2788 }; 2789 2790 /// Represents a linkage specification. 2791 /// 2792 /// For example: 2793 /// \code 2794 /// extern "C" void foo(); 2795 /// \endcode 2796 class LinkageSpecDecl : public Decl, public DeclContext { 2797 virtual void anchor(); 2798 // This class stores some data in DeclContext::LinkageSpecDeclBits to save 2799 // some space. Use the provided accessors to access it. 2800 public: 2801 /// Represents the language in a linkage specification. 2802 /// 2803 /// The values are part of the serialization ABI for 2804 /// ASTs and cannot be changed without altering that ABI. 2805 enum LanguageIDs { lang_c = 1, lang_cxx = 2 }; 2806 2807 private: 2808 /// The source location for the extern keyword. 2809 SourceLocation ExternLoc; 2810 2811 /// The source location for the right brace (if valid). 2812 SourceLocation RBraceLoc; 2813 2814 LinkageSpecDecl(DeclContext *DC, SourceLocation ExternLoc, 2815 SourceLocation LangLoc, LanguageIDs lang, bool HasBraces); 2816 2817 public: 2818 static LinkageSpecDecl *Create(ASTContext &C, DeclContext *DC, 2819 SourceLocation ExternLoc, 2820 SourceLocation LangLoc, LanguageIDs Lang, 2821 bool HasBraces); 2822 static LinkageSpecDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2823 2824 /// Return the language specified by this linkage specification. getLanguage()2825 LanguageIDs getLanguage() const { 2826 return static_cast<LanguageIDs>(LinkageSpecDeclBits.Language); 2827 } 2828 2829 /// Set the language specified by this linkage specification. setLanguage(LanguageIDs L)2830 void setLanguage(LanguageIDs L) { LinkageSpecDeclBits.Language = L; } 2831 2832 /// Determines whether this linkage specification had braces in 2833 /// its syntactic form. hasBraces()2834 bool hasBraces() const { 2835 assert(!RBraceLoc.isValid() || LinkageSpecDeclBits.HasBraces); 2836 return LinkageSpecDeclBits.HasBraces; 2837 } 2838 getExternLoc()2839 SourceLocation getExternLoc() const { return ExternLoc; } getRBraceLoc()2840 SourceLocation getRBraceLoc() const { return RBraceLoc; } setExternLoc(SourceLocation L)2841 void setExternLoc(SourceLocation L) { ExternLoc = L; } setRBraceLoc(SourceLocation L)2842 void setRBraceLoc(SourceLocation L) { 2843 RBraceLoc = L; 2844 LinkageSpecDeclBits.HasBraces = RBraceLoc.isValid(); 2845 } 2846 getEndLoc()2847 SourceLocation getEndLoc() const LLVM_READONLY { 2848 if (hasBraces()) 2849 return getRBraceLoc(); 2850 // No braces: get the end location of the (only) declaration in context 2851 // (if present). 2852 return decls_empty() ? getLocation() : decls_begin()->getEndLoc(); 2853 } 2854 getSourceRange()2855 SourceRange getSourceRange() const override LLVM_READONLY { 2856 return SourceRange(ExternLoc, getEndLoc()); 2857 } 2858 classof(const Decl * D)2859 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)2860 static bool classofKind(Kind K) { return K == LinkageSpec; } 2861 castToDeclContext(const LinkageSpecDecl * D)2862 static DeclContext *castToDeclContext(const LinkageSpecDecl *D) { 2863 return static_cast<DeclContext *>(const_cast<LinkageSpecDecl*>(D)); 2864 } 2865 castFromDeclContext(const DeclContext * DC)2866 static LinkageSpecDecl *castFromDeclContext(const DeclContext *DC) { 2867 return static_cast<LinkageSpecDecl *>(const_cast<DeclContext*>(DC)); 2868 } 2869 }; 2870 2871 /// Represents C++ using-directive. 2872 /// 2873 /// For example: 2874 /// \code 2875 /// using namespace std; 2876 /// \endcode 2877 /// 2878 /// \note UsingDirectiveDecl should be Decl not NamedDecl, but we provide 2879 /// artificial names for all using-directives in order to store 2880 /// them in DeclContext effectively. 2881 class UsingDirectiveDecl : public NamedDecl { 2882 /// The location of the \c using keyword. 2883 SourceLocation UsingLoc; 2884 2885 /// The location of the \c namespace keyword. 2886 SourceLocation NamespaceLoc; 2887 2888 /// The nested-name-specifier that precedes the namespace. 2889 NestedNameSpecifierLoc QualifierLoc; 2890 2891 /// The namespace nominated by this using-directive. 2892 NamedDecl *NominatedNamespace; 2893 2894 /// Enclosing context containing both using-directive and nominated 2895 /// namespace. 2896 DeclContext *CommonAncestor; 2897 UsingDirectiveDecl(DeclContext * DC,SourceLocation UsingLoc,SourceLocation NamespcLoc,NestedNameSpecifierLoc QualifierLoc,SourceLocation IdentLoc,NamedDecl * Nominated,DeclContext * CommonAncestor)2898 UsingDirectiveDecl(DeclContext *DC, SourceLocation UsingLoc, 2899 SourceLocation NamespcLoc, 2900 NestedNameSpecifierLoc QualifierLoc, 2901 SourceLocation IdentLoc, 2902 NamedDecl *Nominated, 2903 DeclContext *CommonAncestor) 2904 : NamedDecl(UsingDirective, DC, IdentLoc, getName()), UsingLoc(UsingLoc), 2905 NamespaceLoc(NamespcLoc), QualifierLoc(QualifierLoc), 2906 NominatedNamespace(Nominated), CommonAncestor(CommonAncestor) {} 2907 2908 /// Returns special DeclarationName used by using-directives. 2909 /// 2910 /// This is only used by DeclContext for storing UsingDirectiveDecls in 2911 /// its lookup structure. getName()2912 static DeclarationName getName() { 2913 return DeclarationName::getUsingDirectiveName(); 2914 } 2915 2916 void anchor() override; 2917 2918 public: 2919 friend class ASTDeclReader; 2920 2921 // Friend for getUsingDirectiveName. 2922 friend class DeclContext; 2923 2924 /// Retrieve the nested-name-specifier that qualifies the 2925 /// name of the namespace, with source-location information. getQualifierLoc()2926 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 2927 2928 /// Retrieve the nested-name-specifier that qualifies the 2929 /// name of the namespace. getQualifier()2930 NestedNameSpecifier *getQualifier() const { 2931 return QualifierLoc.getNestedNameSpecifier(); 2932 } 2933 getNominatedNamespaceAsWritten()2934 NamedDecl *getNominatedNamespaceAsWritten() { return NominatedNamespace; } getNominatedNamespaceAsWritten()2935 const NamedDecl *getNominatedNamespaceAsWritten() const { 2936 return NominatedNamespace; 2937 } 2938 2939 /// Returns the namespace nominated by this using-directive. 2940 NamespaceDecl *getNominatedNamespace(); 2941 getNominatedNamespace()2942 const NamespaceDecl *getNominatedNamespace() const { 2943 return const_cast<UsingDirectiveDecl*>(this)->getNominatedNamespace(); 2944 } 2945 2946 /// Returns the common ancestor context of this using-directive and 2947 /// its nominated namespace. getCommonAncestor()2948 DeclContext *getCommonAncestor() { return CommonAncestor; } getCommonAncestor()2949 const DeclContext *getCommonAncestor() const { return CommonAncestor; } 2950 2951 /// Return the location of the \c using keyword. getUsingLoc()2952 SourceLocation getUsingLoc() const { return UsingLoc; } 2953 2954 // FIXME: Could omit 'Key' in name. 2955 /// Returns the location of the \c namespace keyword. getNamespaceKeyLocation()2956 SourceLocation getNamespaceKeyLocation() const { return NamespaceLoc; } 2957 2958 /// Returns the location of this using declaration's identifier. getIdentLocation()2959 SourceLocation getIdentLocation() const { return getLocation(); } 2960 2961 static UsingDirectiveDecl *Create(ASTContext &C, DeclContext *DC, 2962 SourceLocation UsingLoc, 2963 SourceLocation NamespaceLoc, 2964 NestedNameSpecifierLoc QualifierLoc, 2965 SourceLocation IdentLoc, 2966 NamedDecl *Nominated, 2967 DeclContext *CommonAncestor); 2968 static UsingDirectiveDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2969 getSourceRange()2970 SourceRange getSourceRange() const override LLVM_READONLY { 2971 return SourceRange(UsingLoc, getLocation()); 2972 } 2973 classof(const Decl * D)2974 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)2975 static bool classofKind(Kind K) { return K == UsingDirective; } 2976 }; 2977 2978 /// Represents a C++ namespace alias. 2979 /// 2980 /// For example: 2981 /// 2982 /// \code 2983 /// namespace Foo = Bar; 2984 /// \endcode 2985 class NamespaceAliasDecl : public NamedDecl, 2986 public Redeclarable<NamespaceAliasDecl> { 2987 friend class ASTDeclReader; 2988 2989 /// The location of the \c namespace keyword. 2990 SourceLocation NamespaceLoc; 2991 2992 /// The location of the namespace's identifier. 2993 /// 2994 /// This is accessed by TargetNameLoc. 2995 SourceLocation IdentLoc; 2996 2997 /// The nested-name-specifier that precedes the namespace. 2998 NestedNameSpecifierLoc QualifierLoc; 2999 3000 /// The Decl that this alias points to, either a NamespaceDecl or 3001 /// a NamespaceAliasDecl. 3002 NamedDecl *Namespace; 3003 NamespaceAliasDecl(ASTContext & C,DeclContext * DC,SourceLocation NamespaceLoc,SourceLocation AliasLoc,IdentifierInfo * Alias,NestedNameSpecifierLoc QualifierLoc,SourceLocation IdentLoc,NamedDecl * Namespace)3004 NamespaceAliasDecl(ASTContext &C, DeclContext *DC, 3005 SourceLocation NamespaceLoc, SourceLocation AliasLoc, 3006 IdentifierInfo *Alias, NestedNameSpecifierLoc QualifierLoc, 3007 SourceLocation IdentLoc, NamedDecl *Namespace) 3008 : NamedDecl(NamespaceAlias, DC, AliasLoc, Alias), redeclarable_base(C), 3009 NamespaceLoc(NamespaceLoc), IdentLoc(IdentLoc), 3010 QualifierLoc(QualifierLoc), Namespace(Namespace) {} 3011 3012 void anchor() override; 3013 3014 using redeclarable_base = Redeclarable<NamespaceAliasDecl>; 3015 3016 NamespaceAliasDecl *getNextRedeclarationImpl() override; 3017 NamespaceAliasDecl *getPreviousDeclImpl() override; 3018 NamespaceAliasDecl *getMostRecentDeclImpl() override; 3019 3020 public: 3021 static NamespaceAliasDecl *Create(ASTContext &C, DeclContext *DC, 3022 SourceLocation NamespaceLoc, 3023 SourceLocation AliasLoc, 3024 IdentifierInfo *Alias, 3025 NestedNameSpecifierLoc QualifierLoc, 3026 SourceLocation IdentLoc, 3027 NamedDecl *Namespace); 3028 3029 static NamespaceAliasDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3030 3031 using redecl_range = redeclarable_base::redecl_range; 3032 using redecl_iterator = redeclarable_base::redecl_iterator; 3033 3034 using redeclarable_base::redecls_begin; 3035 using redeclarable_base::redecls_end; 3036 using redeclarable_base::redecls; 3037 using redeclarable_base::getPreviousDecl; 3038 using redeclarable_base::getMostRecentDecl; 3039 getCanonicalDecl()3040 NamespaceAliasDecl *getCanonicalDecl() override { 3041 return getFirstDecl(); 3042 } getCanonicalDecl()3043 const NamespaceAliasDecl *getCanonicalDecl() const { 3044 return getFirstDecl(); 3045 } 3046 3047 /// Retrieve the nested-name-specifier that qualifies the 3048 /// name of the namespace, with source-location information. getQualifierLoc()3049 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3050 3051 /// Retrieve the nested-name-specifier that qualifies the 3052 /// name of the namespace. getQualifier()3053 NestedNameSpecifier *getQualifier() const { 3054 return QualifierLoc.getNestedNameSpecifier(); 3055 } 3056 3057 /// Retrieve the namespace declaration aliased by this directive. getNamespace()3058 NamespaceDecl *getNamespace() { 3059 if (auto *AD = dyn_cast<NamespaceAliasDecl>(Namespace)) 3060 return AD->getNamespace(); 3061 3062 return cast<NamespaceDecl>(Namespace); 3063 } 3064 getNamespace()3065 const NamespaceDecl *getNamespace() const { 3066 return const_cast<NamespaceAliasDecl *>(this)->getNamespace(); 3067 } 3068 3069 /// Returns the location of the alias name, i.e. 'foo' in 3070 /// "namespace foo = ns::bar;". getAliasLoc()3071 SourceLocation getAliasLoc() const { return getLocation(); } 3072 3073 /// Returns the location of the \c namespace keyword. getNamespaceLoc()3074 SourceLocation getNamespaceLoc() const { return NamespaceLoc; } 3075 3076 /// Returns the location of the identifier in the named namespace. getTargetNameLoc()3077 SourceLocation getTargetNameLoc() const { return IdentLoc; } 3078 3079 /// Retrieve the namespace that this alias refers to, which 3080 /// may either be a NamespaceDecl or a NamespaceAliasDecl. getAliasedNamespace()3081 NamedDecl *getAliasedNamespace() const { return Namespace; } 3082 getSourceRange()3083 SourceRange getSourceRange() const override LLVM_READONLY { 3084 return SourceRange(NamespaceLoc, IdentLoc); 3085 } 3086 classof(const Decl * D)3087 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)3088 static bool classofKind(Kind K) { return K == NamespaceAlias; } 3089 }; 3090 3091 /// Implicit declaration of a temporary that was materialized by 3092 /// a MaterializeTemporaryExpr and lifetime-extended by a declaration 3093 class LifetimeExtendedTemporaryDecl final 3094 : public Decl, 3095 public Mergeable<LifetimeExtendedTemporaryDecl> { 3096 friend class MaterializeTemporaryExpr; 3097 friend class ASTDeclReader; 3098 3099 Stmt *ExprWithTemporary = nullptr; 3100 3101 /// The declaration which lifetime-extended this reference, if any. 3102 /// Either a VarDecl, or (for a ctor-initializer) a FieldDecl. 3103 ValueDecl *ExtendingDecl = nullptr; 3104 unsigned ManglingNumber; 3105 3106 mutable APValue *Value = nullptr; 3107 3108 virtual void anchor(); 3109 LifetimeExtendedTemporaryDecl(Expr * Temp,ValueDecl * EDecl,unsigned Mangling)3110 LifetimeExtendedTemporaryDecl(Expr *Temp, ValueDecl *EDecl, unsigned Mangling) 3111 : Decl(Decl::LifetimeExtendedTemporary, EDecl->getDeclContext(), 3112 EDecl->getLocation()), 3113 ExprWithTemporary(Temp), ExtendingDecl(EDecl), 3114 ManglingNumber(Mangling) {} 3115 LifetimeExtendedTemporaryDecl(EmptyShell)3116 LifetimeExtendedTemporaryDecl(EmptyShell) 3117 : Decl(Decl::LifetimeExtendedTemporary, EmptyShell{}) {} 3118 3119 public: Create(Expr * Temp,ValueDecl * EDec,unsigned Mangling)3120 static LifetimeExtendedTemporaryDecl *Create(Expr *Temp, ValueDecl *EDec, 3121 unsigned Mangling) { 3122 return new (EDec->getASTContext(), EDec->getDeclContext()) 3123 LifetimeExtendedTemporaryDecl(Temp, EDec, Mangling); 3124 } CreateDeserialized(ASTContext & C,unsigned ID)3125 static LifetimeExtendedTemporaryDecl *CreateDeserialized(ASTContext &C, 3126 unsigned ID) { 3127 return new (C, ID) LifetimeExtendedTemporaryDecl(EmptyShell{}); 3128 } 3129 getExtendingDecl()3130 ValueDecl *getExtendingDecl() { return ExtendingDecl; } getExtendingDecl()3131 const ValueDecl *getExtendingDecl() const { return ExtendingDecl; } 3132 3133 /// Retrieve the storage duration for the materialized temporary. 3134 StorageDuration getStorageDuration() const; 3135 3136 /// Retrieve the expression to which the temporary materialization conversion 3137 /// was applied. This isn't necessarily the initializer of the temporary due 3138 /// to the C++98 delayed materialization rules, but 3139 /// skipRValueSubobjectAdjustments can be used to find said initializer within 3140 /// the subexpression. getTemporaryExpr()3141 Expr *getTemporaryExpr() { return cast<Expr>(ExprWithTemporary); } getTemporaryExpr()3142 const Expr *getTemporaryExpr() const { return cast<Expr>(ExprWithTemporary); } 3143 getManglingNumber()3144 unsigned getManglingNumber() const { return ManglingNumber; } 3145 3146 /// Get the storage for the constant value of a materialized temporary 3147 /// of static storage duration. 3148 APValue *getOrCreateValue(bool MayCreate) const; 3149 getValue()3150 APValue *getValue() const { return Value; } 3151 3152 // Iterators childrenExpr()3153 Stmt::child_range childrenExpr() { 3154 return Stmt::child_range(&ExprWithTemporary, &ExprWithTemporary + 1); 3155 } 3156 childrenExpr()3157 Stmt::const_child_range childrenExpr() const { 3158 return Stmt::const_child_range(&ExprWithTemporary, &ExprWithTemporary + 1); 3159 } 3160 classof(const Decl * D)3161 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)3162 static bool classofKind(Kind K) { 3163 return K == Decl::LifetimeExtendedTemporary; 3164 } 3165 }; 3166 3167 /// Represents a shadow declaration implicitly introduced into a scope by a 3168 /// (resolved) using-declaration or using-enum-declaration to achieve 3169 /// the desired lookup semantics. 3170 /// 3171 /// For example: 3172 /// \code 3173 /// namespace A { 3174 /// void foo(); 3175 /// void foo(int); 3176 /// struct foo {}; 3177 /// enum bar { bar1, bar2 }; 3178 /// } 3179 /// namespace B { 3180 /// // add a UsingDecl and three UsingShadowDecls (named foo) to B. 3181 /// using A::foo; 3182 /// // adds UsingEnumDecl and two UsingShadowDecls (named bar1 and bar2) to B. 3183 /// using enum A::bar; 3184 /// } 3185 /// \endcode 3186 class UsingShadowDecl : public NamedDecl, public Redeclarable<UsingShadowDecl> { 3187 friend class BaseUsingDecl; 3188 3189 /// The referenced declaration. 3190 NamedDecl *Underlying = nullptr; 3191 3192 /// The using declaration which introduced this decl or the next using 3193 /// shadow declaration contained in the aforementioned using declaration. 3194 NamedDecl *UsingOrNextShadow = nullptr; 3195 3196 void anchor() override; 3197 3198 using redeclarable_base = Redeclarable<UsingShadowDecl>; 3199 getNextRedeclarationImpl()3200 UsingShadowDecl *getNextRedeclarationImpl() override { 3201 return getNextRedeclaration(); 3202 } 3203 getPreviousDeclImpl()3204 UsingShadowDecl *getPreviousDeclImpl() override { 3205 return getPreviousDecl(); 3206 } 3207 getMostRecentDeclImpl()3208 UsingShadowDecl *getMostRecentDeclImpl() override { 3209 return getMostRecentDecl(); 3210 } 3211 3212 protected: 3213 UsingShadowDecl(Kind K, ASTContext &C, DeclContext *DC, SourceLocation Loc, 3214 DeclarationName Name, BaseUsingDecl *Introducer, 3215 NamedDecl *Target); 3216 UsingShadowDecl(Kind K, ASTContext &C, EmptyShell); 3217 3218 public: 3219 friend class ASTDeclReader; 3220 friend class ASTDeclWriter; 3221 Create(ASTContext & C,DeclContext * DC,SourceLocation Loc,DeclarationName Name,BaseUsingDecl * Introducer,NamedDecl * Target)3222 static UsingShadowDecl *Create(ASTContext &C, DeclContext *DC, 3223 SourceLocation Loc, DeclarationName Name, 3224 BaseUsingDecl *Introducer, NamedDecl *Target) { 3225 return new (C, DC) 3226 UsingShadowDecl(UsingShadow, C, DC, Loc, Name, Introducer, Target); 3227 } 3228 3229 static UsingShadowDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3230 3231 using redecl_range = redeclarable_base::redecl_range; 3232 using redecl_iterator = redeclarable_base::redecl_iterator; 3233 3234 using redeclarable_base::redecls_begin; 3235 using redeclarable_base::redecls_end; 3236 using redeclarable_base::redecls; 3237 using redeclarable_base::getPreviousDecl; 3238 using redeclarable_base::getMostRecentDecl; 3239 using redeclarable_base::isFirstDecl; 3240 getCanonicalDecl()3241 UsingShadowDecl *getCanonicalDecl() override { 3242 return getFirstDecl(); 3243 } getCanonicalDecl()3244 const UsingShadowDecl *getCanonicalDecl() const { 3245 return getFirstDecl(); 3246 } 3247 3248 /// Gets the underlying declaration which has been brought into the 3249 /// local scope. getTargetDecl()3250 NamedDecl *getTargetDecl() const { return Underlying; } 3251 3252 /// Sets the underlying declaration which has been brought into the 3253 /// local scope. setTargetDecl(NamedDecl * ND)3254 void setTargetDecl(NamedDecl *ND) { 3255 assert(ND && "Target decl is null!"); 3256 Underlying = ND; 3257 // A UsingShadowDecl is never a friend or local extern declaration, even 3258 // if it is a shadow declaration for one. 3259 IdentifierNamespace = 3260 ND->getIdentifierNamespace() & 3261 ~(IDNS_OrdinaryFriend | IDNS_TagFriend | IDNS_LocalExtern); 3262 } 3263 3264 /// Gets the (written or instantiated) using declaration that introduced this 3265 /// declaration. 3266 BaseUsingDecl *getIntroducer() const; 3267 3268 /// The next using shadow declaration contained in the shadow decl 3269 /// chain of the using declaration which introduced this decl. getNextUsingShadowDecl()3270 UsingShadowDecl *getNextUsingShadowDecl() const { 3271 return dyn_cast_or_null<UsingShadowDecl>(UsingOrNextShadow); 3272 } 3273 classof(const Decl * D)3274 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)3275 static bool classofKind(Kind K) { 3276 return K == Decl::UsingShadow || K == Decl::ConstructorUsingShadow; 3277 } 3278 }; 3279 3280 /// Represents a C++ declaration that introduces decls from somewhere else. It 3281 /// provides a set of the shadow decls so introduced. 3282 3283 class BaseUsingDecl : public NamedDecl { 3284 /// The first shadow declaration of the shadow decl chain associated 3285 /// with this using declaration. 3286 /// 3287 /// The bool member of the pair is a bool flag a derived type may use 3288 /// (UsingDecl makes use of it). 3289 llvm::PointerIntPair<UsingShadowDecl *, 1, bool> FirstUsingShadow; 3290 3291 protected: BaseUsingDecl(Kind DK,DeclContext * DC,SourceLocation L,DeclarationName N)3292 BaseUsingDecl(Kind DK, DeclContext *DC, SourceLocation L, DeclarationName N) 3293 : NamedDecl(DK, DC, L, N), FirstUsingShadow(nullptr, 0) {} 3294 3295 private: 3296 void anchor() override; 3297 3298 protected: 3299 /// A bool flag for use by a derived type getShadowFlag()3300 bool getShadowFlag() const { return FirstUsingShadow.getInt(); } 3301 3302 /// A bool flag a derived type may set setShadowFlag(bool V)3303 void setShadowFlag(bool V) { FirstUsingShadow.setInt(V); } 3304 3305 public: 3306 friend class ASTDeclReader; 3307 friend class ASTDeclWriter; 3308 3309 /// Iterates through the using shadow declarations associated with 3310 /// this using declaration. 3311 class shadow_iterator { 3312 /// The current using shadow declaration. 3313 UsingShadowDecl *Current = nullptr; 3314 3315 public: 3316 using value_type = UsingShadowDecl *; 3317 using reference = UsingShadowDecl *; 3318 using pointer = UsingShadowDecl *; 3319 using iterator_category = std::forward_iterator_tag; 3320 using difference_type = std::ptrdiff_t; 3321 3322 shadow_iterator() = default; shadow_iterator(UsingShadowDecl * C)3323 explicit shadow_iterator(UsingShadowDecl *C) : Current(C) {} 3324 3325 reference operator*() const { return Current; } 3326 pointer operator->() const { return Current; } 3327 3328 shadow_iterator &operator++() { 3329 Current = Current->getNextUsingShadowDecl(); 3330 return *this; 3331 } 3332 3333 shadow_iterator operator++(int) { 3334 shadow_iterator tmp(*this); 3335 ++(*this); 3336 return tmp; 3337 } 3338 3339 friend bool operator==(shadow_iterator x, shadow_iterator y) { 3340 return x.Current == y.Current; 3341 } 3342 friend bool operator!=(shadow_iterator x, shadow_iterator y) { 3343 return x.Current != y.Current; 3344 } 3345 }; 3346 3347 using shadow_range = llvm::iterator_range<shadow_iterator>; 3348 shadows()3349 shadow_range shadows() const { 3350 return shadow_range(shadow_begin(), shadow_end()); 3351 } 3352 shadow_begin()3353 shadow_iterator shadow_begin() const { 3354 return shadow_iterator(FirstUsingShadow.getPointer()); 3355 } 3356 shadow_end()3357 shadow_iterator shadow_end() const { return shadow_iterator(); } 3358 3359 /// Return the number of shadowed declarations associated with this 3360 /// using declaration. shadow_size()3361 unsigned shadow_size() const { 3362 return std::distance(shadow_begin(), shadow_end()); 3363 } 3364 3365 void addShadowDecl(UsingShadowDecl *S); 3366 void removeShadowDecl(UsingShadowDecl *S); 3367 classof(const Decl * D)3368 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)3369 static bool classofKind(Kind K) { return K == Using || K == UsingEnum; } 3370 }; 3371 3372 /// Represents a C++ using-declaration. 3373 /// 3374 /// For example: 3375 /// \code 3376 /// using someNameSpace::someIdentifier; 3377 /// \endcode 3378 class UsingDecl : public BaseUsingDecl, public Mergeable<UsingDecl> { 3379 /// The source location of the 'using' keyword itself. 3380 SourceLocation UsingLocation; 3381 3382 /// The nested-name-specifier that precedes the name. 3383 NestedNameSpecifierLoc QualifierLoc; 3384 3385 /// Provides source/type location info for the declaration name 3386 /// embedded in the ValueDecl base class. 3387 DeclarationNameLoc DNLoc; 3388 UsingDecl(DeclContext * DC,SourceLocation UL,NestedNameSpecifierLoc QualifierLoc,const DeclarationNameInfo & NameInfo,bool HasTypenameKeyword)3389 UsingDecl(DeclContext *DC, SourceLocation UL, 3390 NestedNameSpecifierLoc QualifierLoc, 3391 const DeclarationNameInfo &NameInfo, bool HasTypenameKeyword) 3392 : BaseUsingDecl(Using, DC, NameInfo.getLoc(), NameInfo.getName()), 3393 UsingLocation(UL), QualifierLoc(QualifierLoc), 3394 DNLoc(NameInfo.getInfo()) { 3395 setShadowFlag(HasTypenameKeyword); 3396 } 3397 3398 void anchor() override; 3399 3400 public: 3401 friend class ASTDeclReader; 3402 friend class ASTDeclWriter; 3403 3404 /// Return the source location of the 'using' keyword. getUsingLoc()3405 SourceLocation getUsingLoc() const { return UsingLocation; } 3406 3407 /// Set the source location of the 'using' keyword. setUsingLoc(SourceLocation L)3408 void setUsingLoc(SourceLocation L) { UsingLocation = L; } 3409 3410 /// Retrieve the nested-name-specifier that qualifies the name, 3411 /// with source-location information. getQualifierLoc()3412 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3413 3414 /// Retrieve the nested-name-specifier that qualifies the name. getQualifier()3415 NestedNameSpecifier *getQualifier() const { 3416 return QualifierLoc.getNestedNameSpecifier(); 3417 } 3418 getNameInfo()3419 DeclarationNameInfo getNameInfo() const { 3420 return DeclarationNameInfo(getDeclName(), getLocation(), DNLoc); 3421 } 3422 3423 /// Return true if it is a C++03 access declaration (no 'using'). isAccessDeclaration()3424 bool isAccessDeclaration() const { return UsingLocation.isInvalid(); } 3425 3426 /// Return true if the using declaration has 'typename'. hasTypename()3427 bool hasTypename() const { return getShadowFlag(); } 3428 3429 /// Sets whether the using declaration has 'typename'. setTypename(bool TN)3430 void setTypename(bool TN) { setShadowFlag(TN); } 3431 3432 static UsingDecl *Create(ASTContext &C, DeclContext *DC, 3433 SourceLocation UsingL, 3434 NestedNameSpecifierLoc QualifierLoc, 3435 const DeclarationNameInfo &NameInfo, 3436 bool HasTypenameKeyword); 3437 3438 static UsingDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3439 3440 SourceRange getSourceRange() const override LLVM_READONLY; 3441 3442 /// Retrieves the canonical declaration of this declaration. getCanonicalDecl()3443 UsingDecl *getCanonicalDecl() override { 3444 return cast<UsingDecl>(getFirstDecl()); 3445 } getCanonicalDecl()3446 const UsingDecl *getCanonicalDecl() const { 3447 return cast<UsingDecl>(getFirstDecl()); 3448 } 3449 classof(const Decl * D)3450 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)3451 static bool classofKind(Kind K) { return K == Using; } 3452 }; 3453 3454 /// Represents a shadow constructor declaration introduced into a 3455 /// class by a C++11 using-declaration that names a constructor. 3456 /// 3457 /// For example: 3458 /// \code 3459 /// struct Base { Base(int); }; 3460 /// struct Derived { 3461 /// using Base::Base; // creates a UsingDecl and a ConstructorUsingShadowDecl 3462 /// }; 3463 /// \endcode 3464 class ConstructorUsingShadowDecl final : public UsingShadowDecl { 3465 /// If this constructor using declaration inherted the constructor 3466 /// from an indirect base class, this is the ConstructorUsingShadowDecl 3467 /// in the named direct base class from which the declaration was inherited. 3468 ConstructorUsingShadowDecl *NominatedBaseClassShadowDecl = nullptr; 3469 3470 /// If this constructor using declaration inherted the constructor 3471 /// from an indirect base class, this is the ConstructorUsingShadowDecl 3472 /// that will be used to construct the unique direct or virtual base class 3473 /// that receives the constructor arguments. 3474 ConstructorUsingShadowDecl *ConstructedBaseClassShadowDecl = nullptr; 3475 3476 /// \c true if the constructor ultimately named by this using shadow 3477 /// declaration is within a virtual base class subobject of the class that 3478 /// contains this declaration. 3479 unsigned IsVirtual : 1; 3480 ConstructorUsingShadowDecl(ASTContext & C,DeclContext * DC,SourceLocation Loc,UsingDecl * Using,NamedDecl * Target,bool TargetInVirtualBase)3481 ConstructorUsingShadowDecl(ASTContext &C, DeclContext *DC, SourceLocation Loc, 3482 UsingDecl *Using, NamedDecl *Target, 3483 bool TargetInVirtualBase) 3484 : UsingShadowDecl(ConstructorUsingShadow, C, DC, Loc, 3485 Using->getDeclName(), Using, 3486 Target->getUnderlyingDecl()), 3487 NominatedBaseClassShadowDecl( 3488 dyn_cast<ConstructorUsingShadowDecl>(Target)), 3489 ConstructedBaseClassShadowDecl(NominatedBaseClassShadowDecl), 3490 IsVirtual(TargetInVirtualBase) { 3491 // If we found a constructor that chains to a constructor for a virtual 3492 // base, we should directly call that virtual base constructor instead. 3493 // FIXME: This logic belongs in Sema. 3494 if (NominatedBaseClassShadowDecl && 3495 NominatedBaseClassShadowDecl->constructsVirtualBase()) { 3496 ConstructedBaseClassShadowDecl = 3497 NominatedBaseClassShadowDecl->ConstructedBaseClassShadowDecl; 3498 IsVirtual = true; 3499 } 3500 } 3501 ConstructorUsingShadowDecl(ASTContext & C,EmptyShell Empty)3502 ConstructorUsingShadowDecl(ASTContext &C, EmptyShell Empty) 3503 : UsingShadowDecl(ConstructorUsingShadow, C, Empty), IsVirtual(false) {} 3504 3505 void anchor() override; 3506 3507 public: 3508 friend class ASTDeclReader; 3509 friend class ASTDeclWriter; 3510 3511 static ConstructorUsingShadowDecl *Create(ASTContext &C, DeclContext *DC, 3512 SourceLocation Loc, 3513 UsingDecl *Using, NamedDecl *Target, 3514 bool IsVirtual); 3515 static ConstructorUsingShadowDecl *CreateDeserialized(ASTContext &C, 3516 unsigned ID); 3517 3518 /// Override the UsingShadowDecl's getIntroducer, returning the UsingDecl that 3519 /// introduced this. getIntroducer()3520 UsingDecl *getIntroducer() const { 3521 return cast<UsingDecl>(UsingShadowDecl::getIntroducer()); 3522 } 3523 3524 /// Returns the parent of this using shadow declaration, which 3525 /// is the class in which this is declared. 3526 //@{ getParent()3527 const CXXRecordDecl *getParent() const { 3528 return cast<CXXRecordDecl>(getDeclContext()); 3529 } getParent()3530 CXXRecordDecl *getParent() { 3531 return cast<CXXRecordDecl>(getDeclContext()); 3532 } 3533 //@} 3534 3535 /// Get the inheriting constructor declaration for the direct base 3536 /// class from which this using shadow declaration was inherited, if there is 3537 /// one. This can be different for each redeclaration of the same shadow decl. getNominatedBaseClassShadowDecl()3538 ConstructorUsingShadowDecl *getNominatedBaseClassShadowDecl() const { 3539 return NominatedBaseClassShadowDecl; 3540 } 3541 3542 /// Get the inheriting constructor declaration for the base class 3543 /// for which we don't have an explicit initializer, if there is one. getConstructedBaseClassShadowDecl()3544 ConstructorUsingShadowDecl *getConstructedBaseClassShadowDecl() const { 3545 return ConstructedBaseClassShadowDecl; 3546 } 3547 3548 /// Get the base class that was named in the using declaration. This 3549 /// can be different for each redeclaration of this same shadow decl. 3550 CXXRecordDecl *getNominatedBaseClass() const; 3551 3552 /// Get the base class whose constructor or constructor shadow 3553 /// declaration is passed the constructor arguments. getConstructedBaseClass()3554 CXXRecordDecl *getConstructedBaseClass() const { 3555 return cast<CXXRecordDecl>((ConstructedBaseClassShadowDecl 3556 ? ConstructedBaseClassShadowDecl 3557 : getTargetDecl()) 3558 ->getDeclContext()); 3559 } 3560 3561 /// Returns \c true if the constructed base class is a virtual base 3562 /// class subobject of this declaration's class. constructsVirtualBase()3563 bool constructsVirtualBase() const { 3564 return IsVirtual; 3565 } 3566 classof(const Decl * D)3567 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)3568 static bool classofKind(Kind K) { return K == ConstructorUsingShadow; } 3569 }; 3570 3571 /// Represents a C++ using-enum-declaration. 3572 /// 3573 /// For example: 3574 /// \code 3575 /// using enum SomeEnumTag ; 3576 /// \endcode 3577 3578 class UsingEnumDecl : public BaseUsingDecl, public Mergeable<UsingEnumDecl> { 3579 /// The source location of the 'using' keyword itself. 3580 SourceLocation UsingLocation; 3581 3582 /// Location of the 'enum' keyword. 3583 SourceLocation EnumLocation; 3584 3585 /// The enum 3586 EnumDecl *Enum; 3587 UsingEnumDecl(DeclContext * DC,DeclarationName DN,SourceLocation UL,SourceLocation EL,SourceLocation NL,EnumDecl * ED)3588 UsingEnumDecl(DeclContext *DC, DeclarationName DN, SourceLocation UL, 3589 SourceLocation EL, SourceLocation NL, EnumDecl *ED) 3590 : BaseUsingDecl(UsingEnum, DC, NL, DN), UsingLocation(UL), 3591 EnumLocation(EL), Enum(ED) {} 3592 3593 void anchor() override; 3594 3595 public: 3596 friend class ASTDeclReader; 3597 friend class ASTDeclWriter; 3598 3599 /// The source location of the 'using' keyword. getUsingLoc()3600 SourceLocation getUsingLoc() const { return UsingLocation; } setUsingLoc(SourceLocation L)3601 void setUsingLoc(SourceLocation L) { UsingLocation = L; } 3602 3603 /// The source location of the 'enum' keyword. getEnumLoc()3604 SourceLocation getEnumLoc() const { return EnumLocation; } setEnumLoc(SourceLocation L)3605 void setEnumLoc(SourceLocation L) { EnumLocation = L; } 3606 3607 public: getEnumDecl()3608 EnumDecl *getEnumDecl() const { return Enum; } 3609 3610 static UsingEnumDecl *Create(ASTContext &C, DeclContext *DC, 3611 SourceLocation UsingL, SourceLocation EnumL, 3612 SourceLocation NameL, EnumDecl *ED); 3613 3614 static UsingEnumDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3615 3616 SourceRange getSourceRange() const override LLVM_READONLY; 3617 3618 /// Retrieves the canonical declaration of this declaration. getCanonicalDecl()3619 UsingEnumDecl *getCanonicalDecl() override { 3620 return cast<UsingEnumDecl>(getFirstDecl()); 3621 } getCanonicalDecl()3622 const UsingEnumDecl *getCanonicalDecl() const { 3623 return cast<UsingEnumDecl>(getFirstDecl()); 3624 } 3625 classof(const Decl * D)3626 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)3627 static bool classofKind(Kind K) { return K == UsingEnum; } 3628 }; 3629 3630 /// Represents a pack of using declarations that a single 3631 /// using-declarator pack-expanded into. 3632 /// 3633 /// \code 3634 /// template<typename ...T> struct X : T... { 3635 /// using T::operator()...; 3636 /// using T::operator T...; 3637 /// }; 3638 /// \endcode 3639 /// 3640 /// In the second case above, the UsingPackDecl will have the name 3641 /// 'operator T' (which contains an unexpanded pack), but the individual 3642 /// UsingDecls and UsingShadowDecls will have more reasonable names. 3643 class UsingPackDecl final 3644 : public NamedDecl, public Mergeable<UsingPackDecl>, 3645 private llvm::TrailingObjects<UsingPackDecl, NamedDecl *> { 3646 /// The UnresolvedUsingValueDecl or UnresolvedUsingTypenameDecl from 3647 /// which this waas instantiated. 3648 NamedDecl *InstantiatedFrom; 3649 3650 /// The number of using-declarations created by this pack expansion. 3651 unsigned NumExpansions; 3652 UsingPackDecl(DeclContext * DC,NamedDecl * InstantiatedFrom,ArrayRef<NamedDecl * > UsingDecls)3653 UsingPackDecl(DeclContext *DC, NamedDecl *InstantiatedFrom, 3654 ArrayRef<NamedDecl *> UsingDecls) 3655 : NamedDecl(UsingPack, DC, 3656 InstantiatedFrom ? InstantiatedFrom->getLocation() 3657 : SourceLocation(), 3658 InstantiatedFrom ? InstantiatedFrom->getDeclName() 3659 : DeclarationName()), 3660 InstantiatedFrom(InstantiatedFrom), NumExpansions(UsingDecls.size()) { 3661 std::uninitialized_copy(UsingDecls.begin(), UsingDecls.end(), 3662 getTrailingObjects<NamedDecl *>()); 3663 } 3664 3665 void anchor() override; 3666 3667 public: 3668 friend class ASTDeclReader; 3669 friend class ASTDeclWriter; 3670 friend TrailingObjects; 3671 3672 /// Get the using declaration from which this was instantiated. This will 3673 /// always be an UnresolvedUsingValueDecl or an UnresolvedUsingTypenameDecl 3674 /// that is a pack expansion. getInstantiatedFromUsingDecl()3675 NamedDecl *getInstantiatedFromUsingDecl() const { return InstantiatedFrom; } 3676 3677 /// Get the set of using declarations that this pack expanded into. Note that 3678 /// some of these may still be unresolved. expansions()3679 ArrayRef<NamedDecl *> expansions() const { 3680 return llvm::makeArrayRef(getTrailingObjects<NamedDecl *>(), NumExpansions); 3681 } 3682 3683 static UsingPackDecl *Create(ASTContext &C, DeclContext *DC, 3684 NamedDecl *InstantiatedFrom, 3685 ArrayRef<NamedDecl *> UsingDecls); 3686 3687 static UsingPackDecl *CreateDeserialized(ASTContext &C, unsigned ID, 3688 unsigned NumExpansions); 3689 getSourceRange()3690 SourceRange getSourceRange() const override LLVM_READONLY { 3691 return InstantiatedFrom->getSourceRange(); 3692 } 3693 getCanonicalDecl()3694 UsingPackDecl *getCanonicalDecl() override { return getFirstDecl(); } getCanonicalDecl()3695 const UsingPackDecl *getCanonicalDecl() const { return getFirstDecl(); } 3696 classof(const Decl * D)3697 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)3698 static bool classofKind(Kind K) { return K == UsingPack; } 3699 }; 3700 3701 /// Represents a dependent using declaration which was not marked with 3702 /// \c typename. 3703 /// 3704 /// Unlike non-dependent using declarations, these *only* bring through 3705 /// non-types; otherwise they would break two-phase lookup. 3706 /// 3707 /// \code 3708 /// template \<class T> class A : public Base<T> { 3709 /// using Base<T>::foo; 3710 /// }; 3711 /// \endcode 3712 class UnresolvedUsingValueDecl : public ValueDecl, 3713 public Mergeable<UnresolvedUsingValueDecl> { 3714 /// The source location of the 'using' keyword 3715 SourceLocation UsingLocation; 3716 3717 /// If this is a pack expansion, the location of the '...'. 3718 SourceLocation EllipsisLoc; 3719 3720 /// The nested-name-specifier that precedes the name. 3721 NestedNameSpecifierLoc QualifierLoc; 3722 3723 /// Provides source/type location info for the declaration name 3724 /// embedded in the ValueDecl base class. 3725 DeclarationNameLoc DNLoc; 3726 UnresolvedUsingValueDecl(DeclContext * DC,QualType Ty,SourceLocation UsingLoc,NestedNameSpecifierLoc QualifierLoc,const DeclarationNameInfo & NameInfo,SourceLocation EllipsisLoc)3727 UnresolvedUsingValueDecl(DeclContext *DC, QualType Ty, 3728 SourceLocation UsingLoc, 3729 NestedNameSpecifierLoc QualifierLoc, 3730 const DeclarationNameInfo &NameInfo, 3731 SourceLocation EllipsisLoc) 3732 : ValueDecl(UnresolvedUsingValue, DC, 3733 NameInfo.getLoc(), NameInfo.getName(), Ty), 3734 UsingLocation(UsingLoc), EllipsisLoc(EllipsisLoc), 3735 QualifierLoc(QualifierLoc), DNLoc(NameInfo.getInfo()) {} 3736 3737 void anchor() override; 3738 3739 public: 3740 friend class ASTDeclReader; 3741 friend class ASTDeclWriter; 3742 3743 /// Returns the source location of the 'using' keyword. getUsingLoc()3744 SourceLocation getUsingLoc() const { return UsingLocation; } 3745 3746 /// Set the source location of the 'using' keyword. setUsingLoc(SourceLocation L)3747 void setUsingLoc(SourceLocation L) { UsingLocation = L; } 3748 3749 /// Return true if it is a C++03 access declaration (no 'using'). isAccessDeclaration()3750 bool isAccessDeclaration() const { return UsingLocation.isInvalid(); } 3751 3752 /// Retrieve the nested-name-specifier that qualifies the name, 3753 /// with source-location information. getQualifierLoc()3754 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3755 3756 /// Retrieve the nested-name-specifier that qualifies the name. getQualifier()3757 NestedNameSpecifier *getQualifier() const { 3758 return QualifierLoc.getNestedNameSpecifier(); 3759 } 3760 getNameInfo()3761 DeclarationNameInfo getNameInfo() const { 3762 return DeclarationNameInfo(getDeclName(), getLocation(), DNLoc); 3763 } 3764 3765 /// Determine whether this is a pack expansion. isPackExpansion()3766 bool isPackExpansion() const { 3767 return EllipsisLoc.isValid(); 3768 } 3769 3770 /// Get the location of the ellipsis if this is a pack expansion. getEllipsisLoc()3771 SourceLocation getEllipsisLoc() const { 3772 return EllipsisLoc; 3773 } 3774 3775 static UnresolvedUsingValueDecl * 3776 Create(ASTContext &C, DeclContext *DC, SourceLocation UsingLoc, 3777 NestedNameSpecifierLoc QualifierLoc, 3778 const DeclarationNameInfo &NameInfo, SourceLocation EllipsisLoc); 3779 3780 static UnresolvedUsingValueDecl * 3781 CreateDeserialized(ASTContext &C, unsigned ID); 3782 3783 SourceRange getSourceRange() const override LLVM_READONLY; 3784 3785 /// Retrieves the canonical declaration of this declaration. getCanonicalDecl()3786 UnresolvedUsingValueDecl *getCanonicalDecl() override { 3787 return getFirstDecl(); 3788 } getCanonicalDecl()3789 const UnresolvedUsingValueDecl *getCanonicalDecl() const { 3790 return getFirstDecl(); 3791 } 3792 classof(const Decl * D)3793 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)3794 static bool classofKind(Kind K) { return K == UnresolvedUsingValue; } 3795 }; 3796 3797 /// Represents a dependent using declaration which was marked with 3798 /// \c typename. 3799 /// 3800 /// \code 3801 /// template \<class T> class A : public Base<T> { 3802 /// using typename Base<T>::foo; 3803 /// }; 3804 /// \endcode 3805 /// 3806 /// The type associated with an unresolved using typename decl is 3807 /// currently always a typename type. 3808 class UnresolvedUsingTypenameDecl 3809 : public TypeDecl, 3810 public Mergeable<UnresolvedUsingTypenameDecl> { 3811 friend class ASTDeclReader; 3812 3813 /// The source location of the 'typename' keyword 3814 SourceLocation TypenameLocation; 3815 3816 /// If this is a pack expansion, the location of the '...'. 3817 SourceLocation EllipsisLoc; 3818 3819 /// The nested-name-specifier that precedes the name. 3820 NestedNameSpecifierLoc QualifierLoc; 3821 UnresolvedUsingTypenameDecl(DeclContext * DC,SourceLocation UsingLoc,SourceLocation TypenameLoc,NestedNameSpecifierLoc QualifierLoc,SourceLocation TargetNameLoc,IdentifierInfo * TargetName,SourceLocation EllipsisLoc)3822 UnresolvedUsingTypenameDecl(DeclContext *DC, SourceLocation UsingLoc, 3823 SourceLocation TypenameLoc, 3824 NestedNameSpecifierLoc QualifierLoc, 3825 SourceLocation TargetNameLoc, 3826 IdentifierInfo *TargetName, 3827 SourceLocation EllipsisLoc) 3828 : TypeDecl(UnresolvedUsingTypename, DC, TargetNameLoc, TargetName, 3829 UsingLoc), 3830 TypenameLocation(TypenameLoc), EllipsisLoc(EllipsisLoc), 3831 QualifierLoc(QualifierLoc) {} 3832 3833 void anchor() override; 3834 3835 public: 3836 /// Returns the source location of the 'using' keyword. getUsingLoc()3837 SourceLocation getUsingLoc() const { return getBeginLoc(); } 3838 3839 /// Returns the source location of the 'typename' keyword. getTypenameLoc()3840 SourceLocation getTypenameLoc() const { return TypenameLocation; } 3841 3842 /// Retrieve the nested-name-specifier that qualifies the name, 3843 /// with source-location information. getQualifierLoc()3844 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3845 3846 /// Retrieve the nested-name-specifier that qualifies the name. getQualifier()3847 NestedNameSpecifier *getQualifier() const { 3848 return QualifierLoc.getNestedNameSpecifier(); 3849 } 3850 getNameInfo()3851 DeclarationNameInfo getNameInfo() const { 3852 return DeclarationNameInfo(getDeclName(), getLocation()); 3853 } 3854 3855 /// Determine whether this is a pack expansion. isPackExpansion()3856 bool isPackExpansion() const { 3857 return EllipsisLoc.isValid(); 3858 } 3859 3860 /// Get the location of the ellipsis if this is a pack expansion. getEllipsisLoc()3861 SourceLocation getEllipsisLoc() const { 3862 return EllipsisLoc; 3863 } 3864 3865 static UnresolvedUsingTypenameDecl * 3866 Create(ASTContext &C, DeclContext *DC, SourceLocation UsingLoc, 3867 SourceLocation TypenameLoc, NestedNameSpecifierLoc QualifierLoc, 3868 SourceLocation TargetNameLoc, DeclarationName TargetName, 3869 SourceLocation EllipsisLoc); 3870 3871 static UnresolvedUsingTypenameDecl * 3872 CreateDeserialized(ASTContext &C, unsigned ID); 3873 3874 /// Retrieves the canonical declaration of this declaration. getCanonicalDecl()3875 UnresolvedUsingTypenameDecl *getCanonicalDecl() override { 3876 return getFirstDecl(); 3877 } getCanonicalDecl()3878 const UnresolvedUsingTypenameDecl *getCanonicalDecl() const { 3879 return getFirstDecl(); 3880 } 3881 classof(const Decl * D)3882 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)3883 static bool classofKind(Kind K) { return K == UnresolvedUsingTypename; } 3884 }; 3885 3886 /// This node is generated when a using-declaration that was annotated with 3887 /// __attribute__((using_if_exists)) failed to resolve to a known declaration. 3888 /// In that case, Sema builds a UsingShadowDecl whose target is an instance of 3889 /// this declaration, adding it to the current scope. Referring to this 3890 /// declaration in any way is an error. 3891 class UnresolvedUsingIfExistsDecl final : public NamedDecl { 3892 UnresolvedUsingIfExistsDecl(DeclContext *DC, SourceLocation Loc, 3893 DeclarationName Name); 3894 3895 void anchor() override; 3896 3897 public: 3898 static UnresolvedUsingIfExistsDecl *Create(ASTContext &Ctx, DeclContext *DC, 3899 SourceLocation Loc, 3900 DeclarationName Name); 3901 static UnresolvedUsingIfExistsDecl *CreateDeserialized(ASTContext &Ctx, 3902 unsigned ID); 3903 classof(const Decl * D)3904 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)3905 static bool classofKind(Kind K) { return K == Decl::UnresolvedUsingIfExists; } 3906 }; 3907 3908 /// Represents a C++11 static_assert declaration. 3909 class StaticAssertDecl : public Decl { 3910 llvm::PointerIntPair<Expr *, 1, bool> AssertExprAndFailed; 3911 StringLiteral *Message; 3912 SourceLocation RParenLoc; 3913 StaticAssertDecl(DeclContext * DC,SourceLocation StaticAssertLoc,Expr * AssertExpr,StringLiteral * Message,SourceLocation RParenLoc,bool Failed)3914 StaticAssertDecl(DeclContext *DC, SourceLocation StaticAssertLoc, 3915 Expr *AssertExpr, StringLiteral *Message, 3916 SourceLocation RParenLoc, bool Failed) 3917 : Decl(StaticAssert, DC, StaticAssertLoc), 3918 AssertExprAndFailed(AssertExpr, Failed), Message(Message), 3919 RParenLoc(RParenLoc) {} 3920 3921 virtual void anchor(); 3922 3923 public: 3924 friend class ASTDeclReader; 3925 3926 static StaticAssertDecl *Create(ASTContext &C, DeclContext *DC, 3927 SourceLocation StaticAssertLoc, 3928 Expr *AssertExpr, StringLiteral *Message, 3929 SourceLocation RParenLoc, bool Failed); 3930 static StaticAssertDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3931 getAssertExpr()3932 Expr *getAssertExpr() { return AssertExprAndFailed.getPointer(); } getAssertExpr()3933 const Expr *getAssertExpr() const { return AssertExprAndFailed.getPointer(); } 3934 getMessage()3935 StringLiteral *getMessage() { return Message; } getMessage()3936 const StringLiteral *getMessage() const { return Message; } 3937 isFailed()3938 bool isFailed() const { return AssertExprAndFailed.getInt(); } 3939 getRParenLoc()3940 SourceLocation getRParenLoc() const { return RParenLoc; } 3941 getSourceRange()3942 SourceRange getSourceRange() const override LLVM_READONLY { 3943 return SourceRange(getLocation(), getRParenLoc()); 3944 } 3945 classof(const Decl * D)3946 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)3947 static bool classofKind(Kind K) { return K == StaticAssert; } 3948 }; 3949 3950 /// A binding in a decomposition declaration. For instance, given: 3951 /// 3952 /// int n[3]; 3953 /// auto &[a, b, c] = n; 3954 /// 3955 /// a, b, and c are BindingDecls, whose bindings are the expressions 3956 /// x[0], x[1], and x[2] respectively, where x is the implicit 3957 /// DecompositionDecl of type 'int (&)[3]'. 3958 class BindingDecl : public ValueDecl { 3959 /// The declaration that this binding binds to part of. 3960 ValueDecl *Decomp; 3961 /// The binding represented by this declaration. References to this 3962 /// declaration are effectively equivalent to this expression (except 3963 /// that it is only evaluated once at the point of declaration of the 3964 /// binding). 3965 Expr *Binding = nullptr; 3966 BindingDecl(DeclContext * DC,SourceLocation IdLoc,IdentifierInfo * Id)3967 BindingDecl(DeclContext *DC, SourceLocation IdLoc, IdentifierInfo *Id) 3968 : ValueDecl(Decl::Binding, DC, IdLoc, Id, QualType()) {} 3969 3970 void anchor() override; 3971 3972 public: 3973 friend class ASTDeclReader; 3974 3975 static BindingDecl *Create(ASTContext &C, DeclContext *DC, 3976 SourceLocation IdLoc, IdentifierInfo *Id); 3977 static BindingDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3978 3979 /// Get the expression to which this declaration is bound. This may be null 3980 /// in two different cases: while parsing the initializer for the 3981 /// decomposition declaration, and when the initializer is type-dependent. getBinding()3982 Expr *getBinding() const { return Binding; } 3983 3984 /// Get the decomposition declaration that this binding represents a 3985 /// decomposition of. getDecomposedDecl()3986 ValueDecl *getDecomposedDecl() const { return Decomp; } 3987 3988 /// Get the variable (if any) that holds the value of evaluating the binding. 3989 /// Only present for user-defined bindings for tuple-like types. 3990 VarDecl *getHoldingVar() const; 3991 3992 /// Set the binding for this BindingDecl, along with its declared type (which 3993 /// should be a possibly-cv-qualified form of the type of the binding, or a 3994 /// reference to such a type). setBinding(QualType DeclaredType,Expr * Binding)3995 void setBinding(QualType DeclaredType, Expr *Binding) { 3996 setType(DeclaredType); 3997 this->Binding = Binding; 3998 } 3999 4000 /// Set the decomposed variable for this BindingDecl. setDecomposedDecl(ValueDecl * Decomposed)4001 void setDecomposedDecl(ValueDecl *Decomposed) { Decomp = Decomposed; } 4002 classof(const Decl * D)4003 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)4004 static bool classofKind(Kind K) { return K == Decl::Binding; } 4005 }; 4006 4007 /// A decomposition declaration. For instance, given: 4008 /// 4009 /// int n[3]; 4010 /// auto &[a, b, c] = n; 4011 /// 4012 /// the second line declares a DecompositionDecl of type 'int (&)[3]', and 4013 /// three BindingDecls (named a, b, and c). An instance of this class is always 4014 /// unnamed, but behaves in almost all other respects like a VarDecl. 4015 class DecompositionDecl final 4016 : public VarDecl, 4017 private llvm::TrailingObjects<DecompositionDecl, BindingDecl *> { 4018 /// The number of BindingDecl*s following this object. 4019 unsigned NumBindings; 4020 DecompositionDecl(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation LSquareLoc,QualType T,TypeSourceInfo * TInfo,StorageClass SC,ArrayRef<BindingDecl * > Bindings)4021 DecompositionDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, 4022 SourceLocation LSquareLoc, QualType T, 4023 TypeSourceInfo *TInfo, StorageClass SC, 4024 ArrayRef<BindingDecl *> Bindings) 4025 : VarDecl(Decomposition, C, DC, StartLoc, LSquareLoc, nullptr, T, TInfo, 4026 SC), 4027 NumBindings(Bindings.size()) { 4028 std::uninitialized_copy(Bindings.begin(), Bindings.end(), 4029 getTrailingObjects<BindingDecl *>()); 4030 for (auto *B : Bindings) 4031 B->setDecomposedDecl(this); 4032 } 4033 4034 void anchor() override; 4035 4036 public: 4037 friend class ASTDeclReader; 4038 friend TrailingObjects; 4039 4040 static DecompositionDecl *Create(ASTContext &C, DeclContext *DC, 4041 SourceLocation StartLoc, 4042 SourceLocation LSquareLoc, 4043 QualType T, TypeSourceInfo *TInfo, 4044 StorageClass S, 4045 ArrayRef<BindingDecl *> Bindings); 4046 static DecompositionDecl *CreateDeserialized(ASTContext &C, unsigned ID, 4047 unsigned NumBindings); 4048 bindings()4049 ArrayRef<BindingDecl *> bindings() const { 4050 return llvm::makeArrayRef(getTrailingObjects<BindingDecl *>(), NumBindings); 4051 } 4052 4053 void printName(raw_ostream &os) const override; 4054 classof(const Decl * D)4055 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)4056 static bool classofKind(Kind K) { return K == Decomposition; } 4057 }; 4058 4059 /// An instance of this class represents the declaration of a property 4060 /// member. This is a Microsoft extension to C++, first introduced in 4061 /// Visual Studio .NET 2003 as a parallel to similar features in C# 4062 /// and Managed C++. 4063 /// 4064 /// A property must always be a non-static class member. 4065 /// 4066 /// A property member superficially resembles a non-static data 4067 /// member, except preceded by a property attribute: 4068 /// __declspec(property(get=GetX, put=PutX)) int x; 4069 /// Either (but not both) of the 'get' and 'put' names may be omitted. 4070 /// 4071 /// A reference to a property is always an lvalue. If the lvalue 4072 /// undergoes lvalue-to-rvalue conversion, then a getter name is 4073 /// required, and that member is called with no arguments. 4074 /// If the lvalue is assigned into, then a setter name is required, 4075 /// and that member is called with one argument, the value assigned. 4076 /// Both operations are potentially overloaded. Compound assignments 4077 /// are permitted, as are the increment and decrement operators. 4078 /// 4079 /// The getter and putter methods are permitted to be overloaded, 4080 /// although their return and parameter types are subject to certain 4081 /// restrictions according to the type of the property. 4082 /// 4083 /// A property declared using an incomplete array type may 4084 /// additionally be subscripted, adding extra parameters to the getter 4085 /// and putter methods. 4086 class MSPropertyDecl : public DeclaratorDecl { 4087 IdentifierInfo *GetterId, *SetterId; 4088 MSPropertyDecl(DeclContext * DC,SourceLocation L,DeclarationName N,QualType T,TypeSourceInfo * TInfo,SourceLocation StartL,IdentifierInfo * Getter,IdentifierInfo * Setter)4089 MSPropertyDecl(DeclContext *DC, SourceLocation L, DeclarationName N, 4090 QualType T, TypeSourceInfo *TInfo, SourceLocation StartL, 4091 IdentifierInfo *Getter, IdentifierInfo *Setter) 4092 : DeclaratorDecl(MSProperty, DC, L, N, T, TInfo, StartL), 4093 GetterId(Getter), SetterId(Setter) {} 4094 4095 void anchor() override; 4096 public: 4097 friend class ASTDeclReader; 4098 4099 static MSPropertyDecl *Create(ASTContext &C, DeclContext *DC, 4100 SourceLocation L, DeclarationName N, QualType T, 4101 TypeSourceInfo *TInfo, SourceLocation StartL, 4102 IdentifierInfo *Getter, IdentifierInfo *Setter); 4103 static MSPropertyDecl *CreateDeserialized(ASTContext &C, unsigned ID); 4104 classof(const Decl * D)4105 static bool classof(const Decl *D) { return D->getKind() == MSProperty; } 4106 hasGetter()4107 bool hasGetter() const { return GetterId != nullptr; } getGetterId()4108 IdentifierInfo* getGetterId() const { return GetterId; } hasSetter()4109 bool hasSetter() const { return SetterId != nullptr; } getSetterId()4110 IdentifierInfo* getSetterId() const { return SetterId; } 4111 }; 4112 4113 /// Parts of a decomposed MSGuidDecl. Factored out to avoid unnecessary 4114 /// dependencies on DeclCXX.h. 4115 struct MSGuidDeclParts { 4116 /// {01234567-... 4117 uint32_t Part1; 4118 /// ...-89ab-... 4119 uint16_t Part2; 4120 /// ...-cdef-... 4121 uint16_t Part3; 4122 /// ...-0123-456789abcdef} 4123 uint8_t Part4And5[8]; 4124 getPart4And5AsUint64MSGuidDeclParts4125 uint64_t getPart4And5AsUint64() const { 4126 uint64_t Val; 4127 memcpy(&Val, &Part4And5, sizeof(Part4And5)); 4128 return Val; 4129 } 4130 }; 4131 4132 /// A global _GUID constant. These are implicitly created by UuidAttrs. 4133 /// 4134 /// struct _declspec(uuid("01234567-89ab-cdef-0123-456789abcdef")) X{}; 4135 /// 4136 /// X is a CXXRecordDecl that contains a UuidAttr that references the (unique) 4137 /// MSGuidDecl for the specified UUID. 4138 class MSGuidDecl : public ValueDecl, 4139 public Mergeable<MSGuidDecl>, 4140 public llvm::FoldingSetNode { 4141 public: 4142 using Parts = MSGuidDeclParts; 4143 4144 private: 4145 /// The decomposed form of the UUID. 4146 Parts PartVal; 4147 4148 /// The resolved value of the UUID as an APValue. Computed on demand and 4149 /// cached. 4150 mutable APValue APVal; 4151 4152 void anchor() override; 4153 4154 MSGuidDecl(DeclContext *DC, QualType T, Parts P); 4155 4156 static MSGuidDecl *Create(const ASTContext &C, QualType T, Parts P); 4157 static MSGuidDecl *CreateDeserialized(ASTContext &C, unsigned ID); 4158 4159 // Only ASTContext::getMSGuidDecl and deserialization create these. 4160 friend class ASTContext; 4161 friend class ASTReader; 4162 friend class ASTDeclReader; 4163 4164 public: 4165 /// Print this UUID in a human-readable format. 4166 void printName(llvm::raw_ostream &OS) const override; 4167 4168 /// Get the decomposed parts of this declaration. getParts()4169 Parts getParts() const { return PartVal; } 4170 4171 /// Get the value of this MSGuidDecl as an APValue. This may fail and return 4172 /// an absent APValue if the type of the declaration is not of the expected 4173 /// shape. 4174 APValue &getAsAPValue() const; 4175 Profile(llvm::FoldingSetNodeID & ID,Parts P)4176 static void Profile(llvm::FoldingSetNodeID &ID, Parts P) { 4177 ID.AddInteger(P.Part1); 4178 ID.AddInteger(P.Part2); 4179 ID.AddInteger(P.Part3); 4180 ID.AddInteger(P.getPart4And5AsUint64()); 4181 } Profile(llvm::FoldingSetNodeID & ID)4182 void Profile(llvm::FoldingSetNodeID &ID) { Profile(ID, PartVal); } 4183 classof(const Decl * D)4184 static bool classof(const Decl *D) { return classofKind(D->getKind()); } classofKind(Kind K)4185 static bool classofKind(Kind K) { return K == Decl::MSGuid; } 4186 }; 4187 4188 /// Insertion operator for diagnostics. This allows sending an AccessSpecifier 4189 /// into a diagnostic with <<. 4190 const StreamingDiagnostic &operator<<(const StreamingDiagnostic &DB, 4191 AccessSpecifier AS); 4192 4193 } // namespace clang 4194 4195 #endif // LLVM_CLANG_AST_DECLCXX_H 4196