1 //===-- DeclCXX.h - Classes for representing C++ declarations -*- C++ -*-=====// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 /// 10 /// \file 11 /// \brief Defines the C++ Decl subclasses, other than those for templates 12 /// (found in DeclTemplate.h) and friends (in DeclFriend.h). 13 /// 14 //===----------------------------------------------------------------------===// 15 16 #ifndef LLVM_CLANG_AST_DECLCXX_H 17 #define LLVM_CLANG_AST_DECLCXX_H 18 19 #include "clang/AST/ASTContext.h" 20 #include "clang/AST/ASTUnresolvedSet.h" 21 #include "clang/AST/Attr.h" 22 #include "clang/AST/Decl.h" 23 #include "clang/AST/Expr.h" 24 #include "clang/AST/LambdaCapture.h" 25 #include "llvm/ADT/DenseMap.h" 26 #include "llvm/ADT/PointerIntPair.h" 27 #include "llvm/Support/Compiler.h" 28 29 namespace clang { 30 31 class ClassTemplateDecl; 32 class ClassTemplateSpecializationDecl; 33 class ConstructorUsingShadowDecl; 34 class CXXBasePath; 35 class CXXBasePaths; 36 class CXXConstructorDecl; 37 class CXXConversionDecl; 38 class CXXDestructorDecl; 39 class CXXMethodDecl; 40 class CXXRecordDecl; 41 class CXXMemberLookupCriteria; 42 class CXXFinalOverriderMap; 43 class CXXIndirectPrimaryBaseSet; 44 class FriendDecl; 45 class LambdaExpr; 46 class UsingDecl; 47 48 /// \brief Represents any kind of function declaration, whether it is a 49 /// concrete function or a function template. 50 class AnyFunctionDecl { 51 NamedDecl *Function; 52 53 AnyFunctionDecl(NamedDecl *ND) : Function(ND) { } 54 55 public: 56 AnyFunctionDecl(FunctionDecl *FD) : Function(FD) { } 57 AnyFunctionDecl(FunctionTemplateDecl *FTD); 58 59 /// \brief Implicily converts any function or function template into a 60 /// named declaration. 61 operator NamedDecl *() const { return Function; } 62 63 /// \brief Retrieve the underlying function or function template. 64 NamedDecl *get() const { return Function; } 65 66 static AnyFunctionDecl getFromNamedDecl(NamedDecl *ND) { 67 return AnyFunctionDecl(ND); 68 } 69 }; 70 71 } // end namespace clang 72 73 namespace llvm { 74 // Provide PointerLikeTypeTraits for non-cvr pointers. 75 template<> 76 class PointerLikeTypeTraits< ::clang::AnyFunctionDecl> { 77 public: 78 static inline void *getAsVoidPointer(::clang::AnyFunctionDecl F) { 79 return F.get(); 80 } 81 static inline ::clang::AnyFunctionDecl getFromVoidPointer(void *P) { 82 return ::clang::AnyFunctionDecl::getFromNamedDecl( 83 static_cast< ::clang::NamedDecl*>(P)); 84 } 85 86 enum { NumLowBitsAvailable = 2 }; 87 }; 88 89 } // end namespace llvm 90 91 namespace clang { 92 93 /// \brief Represents an access specifier followed by colon ':'. 94 /// 95 /// An objects of this class represents sugar for the syntactic occurrence 96 /// of an access specifier followed by a colon in the list of member 97 /// specifiers of a C++ class definition. 98 /// 99 /// Note that they do not represent other uses of access specifiers, 100 /// such as those occurring in a list of base specifiers. 101 /// Also note that this class has nothing to do with so-called 102 /// "access declarations" (C++98 11.3 [class.access.dcl]). 103 class AccessSpecDecl : public Decl { 104 virtual void anchor(); 105 /// \brief The location of the ':'. 106 SourceLocation ColonLoc; 107 108 AccessSpecDecl(AccessSpecifier AS, DeclContext *DC, 109 SourceLocation ASLoc, SourceLocation ColonLoc) 110 : Decl(AccessSpec, DC, ASLoc), ColonLoc(ColonLoc) { 111 setAccess(AS); 112 } 113 AccessSpecDecl(EmptyShell Empty) 114 : Decl(AccessSpec, Empty) { } 115 public: 116 /// \brief The location of the access specifier. 117 SourceLocation getAccessSpecifierLoc() const { return getLocation(); } 118 /// \brief Sets the location of the access specifier. 119 void setAccessSpecifierLoc(SourceLocation ASLoc) { setLocation(ASLoc); } 120 121 /// \brief The location of the colon following the access specifier. 122 SourceLocation getColonLoc() const { return ColonLoc; } 123 /// \brief Sets the location of the colon. 124 void setColonLoc(SourceLocation CLoc) { ColonLoc = CLoc; } 125 126 SourceRange getSourceRange() const override LLVM_READONLY { 127 return SourceRange(getAccessSpecifierLoc(), getColonLoc()); 128 } 129 130 static AccessSpecDecl *Create(ASTContext &C, AccessSpecifier AS, 131 DeclContext *DC, SourceLocation ASLoc, 132 SourceLocation ColonLoc) { 133 return new (C, DC) AccessSpecDecl(AS, DC, ASLoc, ColonLoc); 134 } 135 static AccessSpecDecl *CreateDeserialized(ASTContext &C, unsigned ID); 136 137 // Implement isa/cast/dyncast/etc. 138 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 139 static bool classofKind(Kind K) { return K == AccessSpec; } 140 }; 141 142 /// \brief Represents a base class of a C++ class. 143 /// 144 /// Each CXXBaseSpecifier represents a single, direct base class (or 145 /// struct) of a C++ class (or struct). It specifies the type of that 146 /// base class, whether it is a virtual or non-virtual base, and what 147 /// level of access (public, protected, private) is used for the 148 /// derivation. For example: 149 /// 150 /// \code 151 /// class A { }; 152 /// class B { }; 153 /// class C : public virtual A, protected B { }; 154 /// \endcode 155 /// 156 /// In this code, C will have two CXXBaseSpecifiers, one for "public 157 /// virtual A" and the other for "protected B". 158 class CXXBaseSpecifier { 159 /// \brief The source code range that covers the full base 160 /// specifier, including the "virtual" (if present) and access 161 /// specifier (if present). 162 SourceRange Range; 163 164 /// \brief The source location of the ellipsis, if this is a pack 165 /// expansion. 166 SourceLocation EllipsisLoc; 167 168 /// \brief Whether this is a virtual base class or not. 169 unsigned Virtual : 1; 170 171 /// \brief Whether this is the base of a class (true) or of a struct (false). 172 /// 173 /// This determines the mapping from the access specifier as written in the 174 /// source code to the access specifier used for semantic analysis. 175 unsigned BaseOfClass : 1; 176 177 /// \brief Access specifier as written in the source code (may be AS_none). 178 /// 179 /// The actual type of data stored here is an AccessSpecifier, but we use 180 /// "unsigned" here to work around a VC++ bug. 181 unsigned Access : 2; 182 183 /// \brief Whether the class contains a using declaration 184 /// to inherit the named class's constructors. 185 unsigned InheritConstructors : 1; 186 187 /// \brief The type of the base class. 188 /// 189 /// This will be a class or struct (or a typedef of such). The source code 190 /// range does not include the \c virtual or the access specifier. 191 TypeSourceInfo *BaseTypeInfo; 192 193 public: 194 CXXBaseSpecifier() { } 195 196 CXXBaseSpecifier(SourceRange R, bool V, bool BC, AccessSpecifier A, 197 TypeSourceInfo *TInfo, SourceLocation EllipsisLoc) 198 : Range(R), EllipsisLoc(EllipsisLoc), Virtual(V), BaseOfClass(BC), 199 Access(A), InheritConstructors(false), BaseTypeInfo(TInfo) { } 200 201 /// \brief Retrieves the source range that contains the entire base specifier. 202 SourceRange getSourceRange() const LLVM_READONLY { return Range; } 203 SourceLocation getLocStart() const LLVM_READONLY { return Range.getBegin(); } 204 SourceLocation getLocEnd() const LLVM_READONLY { return Range.getEnd(); } 205 206 /// \brief Get the location at which the base class type was written. 207 SourceLocation getBaseTypeLoc() const LLVM_READONLY { 208 return BaseTypeInfo->getTypeLoc().getLocStart(); 209 } 210 211 /// \brief Determines whether the base class is a virtual base class (or not). 212 bool isVirtual() const { return Virtual; } 213 214 /// \brief Determine whether this base class is a base of a class declared 215 /// with the 'class' keyword (vs. one declared with the 'struct' keyword). 216 bool isBaseOfClass() const { return BaseOfClass; } 217 218 /// \brief Determine whether this base specifier is a pack expansion. 219 bool isPackExpansion() const { return EllipsisLoc.isValid(); } 220 221 /// \brief Determine whether this base class's constructors get inherited. 222 bool getInheritConstructors() const { return InheritConstructors; } 223 224 /// \brief Set that this base class's constructors should be inherited. 225 void setInheritConstructors(bool Inherit = true) { 226 InheritConstructors = Inherit; 227 } 228 229 /// \brief For a pack expansion, determine the location of the ellipsis. 230 SourceLocation getEllipsisLoc() const { 231 return EllipsisLoc; 232 } 233 234 /// \brief Returns the access specifier for this base specifier. 235 /// 236 /// This is the actual base specifier as used for semantic analysis, so 237 /// the result can never be AS_none. To retrieve the access specifier as 238 /// written in the source code, use getAccessSpecifierAsWritten(). 239 AccessSpecifier getAccessSpecifier() const { 240 if ((AccessSpecifier)Access == AS_none) 241 return BaseOfClass? AS_private : AS_public; 242 else 243 return (AccessSpecifier)Access; 244 } 245 246 /// \brief Retrieves the access specifier as written in the source code 247 /// (which may mean that no access specifier was explicitly written). 248 /// 249 /// Use getAccessSpecifier() to retrieve the access specifier for use in 250 /// semantic analysis. 251 AccessSpecifier getAccessSpecifierAsWritten() const { 252 return (AccessSpecifier)Access; 253 } 254 255 /// \brief Retrieves the type of the base class. 256 /// 257 /// This type will always be an unqualified class type. 258 QualType getType() const { 259 return BaseTypeInfo->getType().getUnqualifiedType(); 260 } 261 262 /// \brief Retrieves the type and source location of the base class. 263 TypeSourceInfo *getTypeSourceInfo() const { return BaseTypeInfo; } 264 }; 265 266 /// \brief Represents a C++ struct/union/class. 267 class CXXRecordDecl : public RecordDecl { 268 269 friend void TagDecl::startDefinition(); 270 271 /// Values used in DefinitionData fields to represent special members. 272 enum SpecialMemberFlags { 273 SMF_DefaultConstructor = 0x1, 274 SMF_CopyConstructor = 0x2, 275 SMF_MoveConstructor = 0x4, 276 SMF_CopyAssignment = 0x8, 277 SMF_MoveAssignment = 0x10, 278 SMF_Destructor = 0x20, 279 SMF_All = 0x3f 280 }; 281 282 struct DefinitionData { 283 DefinitionData(CXXRecordDecl *D); 284 285 /// \brief True if this class has any user-declared constructors. 286 unsigned UserDeclaredConstructor : 1; 287 288 /// \brief The user-declared special members which this class has. 289 unsigned UserDeclaredSpecialMembers : 6; 290 291 /// \brief True when this class is an aggregate. 292 unsigned Aggregate : 1; 293 294 /// \brief True when this class is a POD-type. 295 unsigned PlainOldData : 1; 296 297 /// true when this class is empty for traits purposes, 298 /// i.e. has no data members other than 0-width bit-fields, has no 299 /// virtual function/base, and doesn't inherit from a non-empty 300 /// class. Doesn't take union-ness into account. 301 unsigned Empty : 1; 302 303 /// \brief True when this class is polymorphic, i.e., has at 304 /// least one virtual member or derives from a polymorphic class. 305 unsigned Polymorphic : 1; 306 307 /// \brief True when this class is abstract, i.e., has at least 308 /// one pure virtual function, (that can come from a base class). 309 unsigned Abstract : 1; 310 311 /// \brief True when this class has standard layout. 312 /// 313 /// C++11 [class]p7. A standard-layout class is a class that: 314 /// * has no non-static data members of type non-standard-layout class (or 315 /// array of such types) or reference, 316 /// * has no virtual functions (10.3) and no virtual base classes (10.1), 317 /// * has the same access control (Clause 11) for all non-static data 318 /// members 319 /// * has no non-standard-layout base classes, 320 /// * either has no non-static data members in the most derived class and at 321 /// most one base class with non-static data members, or has no base 322 /// classes with non-static data members, and 323 /// * has no base classes of the same type as the first non-static data 324 /// member. 325 unsigned IsStandardLayout : 1; 326 327 /// \brief True when there are no non-empty base classes. 328 /// 329 /// This is a helper bit of state used to implement IsStandardLayout more 330 /// efficiently. 331 unsigned HasNoNonEmptyBases : 1; 332 333 /// \brief True when there are private non-static data members. 334 unsigned HasPrivateFields : 1; 335 336 /// \brief True when there are protected non-static data members. 337 unsigned HasProtectedFields : 1; 338 339 /// \brief True when there are private non-static data members. 340 unsigned HasPublicFields : 1; 341 342 /// \brief True if this class (or any subobject) has mutable fields. 343 unsigned HasMutableFields : 1; 344 345 /// \brief True if this class (or any nested anonymous struct or union) 346 /// has variant members. 347 unsigned HasVariantMembers : 1; 348 349 /// \brief True if there no non-field members declared by the user. 350 unsigned HasOnlyCMembers : 1; 351 352 /// \brief True if any field has an in-class initializer, including those 353 /// within anonymous unions or structs. 354 unsigned HasInClassInitializer : 1; 355 356 /// \brief True if any field is of reference type, and does not have an 357 /// in-class initializer. 358 /// 359 /// In this case, value-initialization of this class is illegal in C++98 360 /// even if the class has a trivial default constructor. 361 unsigned HasUninitializedReferenceMember : 1; 362 363 /// \brief True if any non-mutable field whose type doesn't have a user- 364 /// provided default ctor also doesn't have an in-class initializer. 365 unsigned HasUninitializedFields : 1; 366 367 /// \brief True if there are any member using-declarations that inherit 368 /// constructors from a base class. 369 unsigned HasInheritedConstructor : 1; 370 371 /// \brief True if there are any member using-declarations named 372 /// 'operator='. 373 unsigned HasInheritedAssignment : 1; 374 375 /// \brief These flags are \c true if a defaulted corresponding special 376 /// member can't be fully analyzed without performing overload resolution. 377 /// @{ 378 unsigned NeedOverloadResolutionForMoveConstructor : 1; 379 unsigned NeedOverloadResolutionForMoveAssignment : 1; 380 unsigned NeedOverloadResolutionForDestructor : 1; 381 /// @} 382 383 /// \brief These flags are \c true if an implicit defaulted corresponding 384 /// special member would be defined as deleted. 385 /// @{ 386 unsigned DefaultedMoveConstructorIsDeleted : 1; 387 unsigned DefaultedMoveAssignmentIsDeleted : 1; 388 unsigned DefaultedDestructorIsDeleted : 1; 389 /// @} 390 391 /// \brief The trivial special members which this class has, per 392 /// C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25, 393 /// C++11 [class.dtor]p5, or would have if the member were not suppressed. 394 /// 395 /// This excludes any user-declared but not user-provided special members 396 /// which have been declared but not yet defined. 397 unsigned HasTrivialSpecialMembers : 6; 398 399 /// \brief The declared special members of this class which are known to be 400 /// non-trivial. 401 /// 402 /// This excludes any user-declared but not user-provided special members 403 /// which have been declared but not yet defined, and any implicit special 404 /// members which have not yet been declared. 405 unsigned DeclaredNonTrivialSpecialMembers : 6; 406 407 /// \brief True when this class has a destructor with no semantic effect. 408 unsigned HasIrrelevantDestructor : 1; 409 410 /// \brief True when this class has at least one user-declared constexpr 411 /// constructor which is neither the copy nor move constructor. 412 unsigned HasConstexprNonCopyMoveConstructor : 1; 413 414 /// \brief True if this class has a (possibly implicit) defaulted default 415 /// constructor. 416 unsigned HasDefaultedDefaultConstructor : 1; 417 418 /// \brief True if a defaulted default constructor for this class would 419 /// be constexpr. 420 unsigned DefaultedDefaultConstructorIsConstexpr : 1; 421 422 /// \brief True if this class has a constexpr default constructor. 423 /// 424 /// This is true for either a user-declared constexpr default constructor 425 /// or an implicitly declared constexpr default constructor. 426 unsigned HasConstexprDefaultConstructor : 1; 427 428 /// \brief True when this class contains at least one non-static data 429 /// member or base class of non-literal or volatile type. 430 unsigned HasNonLiteralTypeFieldsOrBases : 1; 431 432 /// \brief True when visible conversion functions are already computed 433 /// and are available. 434 unsigned ComputedVisibleConversions : 1; 435 436 /// \brief Whether we have a C++11 user-provided default constructor (not 437 /// explicitly deleted or defaulted). 438 unsigned UserProvidedDefaultConstructor : 1; 439 440 /// \brief The special members which have been declared for this class, 441 /// either by the user or implicitly. 442 unsigned DeclaredSpecialMembers : 6; 443 444 /// \brief Whether an implicit copy constructor could have a const-qualified 445 /// parameter, for initializing virtual bases and for other subobjects. 446 unsigned ImplicitCopyConstructorCanHaveConstParamForVBase : 1; 447 unsigned ImplicitCopyConstructorCanHaveConstParamForNonVBase : 1; 448 449 /// \brief Whether an implicit copy assignment operator would have a 450 /// const-qualified parameter. 451 unsigned ImplicitCopyAssignmentHasConstParam : 1; 452 453 /// \brief Whether any declared copy constructor has a const-qualified 454 /// parameter. 455 unsigned HasDeclaredCopyConstructorWithConstParam : 1; 456 457 /// \brief Whether any declared copy assignment operator has either a 458 /// const-qualified reference parameter or a non-reference parameter. 459 unsigned HasDeclaredCopyAssignmentWithConstParam : 1; 460 461 /// \brief Whether this class describes a C++ lambda. 462 unsigned IsLambda : 1; 463 464 /// \brief Whether we are currently parsing base specifiers. 465 unsigned IsParsingBaseSpecifiers : 1; 466 467 unsigned HasODRHash : 1; 468 469 /// \brief A hash of parts of the class to help in ODR checking. 470 unsigned ODRHash; 471 472 /// \brief The number of base class specifiers in Bases. 473 unsigned NumBases; 474 475 /// \brief The number of virtual base class specifiers in VBases. 476 unsigned NumVBases; 477 478 /// \brief Base classes of this class. 479 /// 480 /// FIXME: This is wasted space for a union. 481 LazyCXXBaseSpecifiersPtr Bases; 482 483 /// \brief direct and indirect virtual base classes of this class. 484 LazyCXXBaseSpecifiersPtr VBases; 485 486 /// \brief The conversion functions of this C++ class (but not its 487 /// inherited conversion functions). 488 /// 489 /// Each of the entries in this overload set is a CXXConversionDecl. 490 LazyASTUnresolvedSet Conversions; 491 492 /// \brief The conversion functions of this C++ class and all those 493 /// inherited conversion functions that are visible in this class. 494 /// 495 /// Each of the entries in this overload set is a CXXConversionDecl or a 496 /// FunctionTemplateDecl. 497 LazyASTUnresolvedSet VisibleConversions; 498 499 /// \brief The declaration which defines this record. 500 CXXRecordDecl *Definition; 501 502 /// \brief The first friend declaration in this class, or null if there 503 /// aren't any. 504 /// 505 /// This is actually currently stored in reverse order. 506 LazyDeclPtr FirstFriend; 507 508 /// \brief Retrieve the set of direct base classes. 509 CXXBaseSpecifier *getBases() const { 510 if (!Bases.isOffset()) 511 return Bases.get(nullptr); 512 return getBasesSlowCase(); 513 } 514 515 /// \brief Retrieve the set of virtual base classes. 516 CXXBaseSpecifier *getVBases() const { 517 if (!VBases.isOffset()) 518 return VBases.get(nullptr); 519 return getVBasesSlowCase(); 520 } 521 522 ArrayRef<CXXBaseSpecifier> bases() const { 523 return llvm::makeArrayRef(getBases(), NumBases); 524 } 525 ArrayRef<CXXBaseSpecifier> vbases() const { 526 return llvm::makeArrayRef(getVBases(), NumVBases); 527 } 528 529 private: 530 CXXBaseSpecifier *getBasesSlowCase() const; 531 CXXBaseSpecifier *getVBasesSlowCase() const; 532 }; 533 534 struct DefinitionData *DefinitionData; 535 536 /// \brief Describes a C++ closure type (generated by a lambda expression). 537 struct LambdaDefinitionData : public DefinitionData { 538 typedef LambdaCapture Capture; 539 540 LambdaDefinitionData(CXXRecordDecl *D, TypeSourceInfo *Info, 541 bool Dependent, bool IsGeneric, 542 LambdaCaptureDefault CaptureDefault) 543 : DefinitionData(D), Dependent(Dependent), IsGenericLambda(IsGeneric), 544 CaptureDefault(CaptureDefault), NumCaptures(0), NumExplicitCaptures(0), 545 ManglingNumber(0), ContextDecl(nullptr), Captures(nullptr), 546 MethodTyInfo(Info) { 547 IsLambda = true; 548 549 // C++1z [expr.prim.lambda]p4: 550 // This class type is not an aggregate type. 551 Aggregate = false; 552 PlainOldData = false; 553 } 554 555 /// \brief Whether this lambda is known to be dependent, even if its 556 /// context isn't dependent. 557 /// 558 /// A lambda with a non-dependent context can be dependent if it occurs 559 /// within the default argument of a function template, because the 560 /// lambda will have been created with the enclosing context as its 561 /// declaration context, rather than function. This is an unfortunate 562 /// artifact of having to parse the default arguments before. 563 unsigned Dependent : 1; 564 565 /// \brief Whether this lambda is a generic lambda. 566 unsigned IsGenericLambda : 1; 567 568 /// \brief The Default Capture. 569 unsigned CaptureDefault : 2; 570 571 /// \brief The number of captures in this lambda is limited 2^NumCaptures. 572 unsigned NumCaptures : 15; 573 574 /// \brief The number of explicit captures in this lambda. 575 unsigned NumExplicitCaptures : 13; 576 577 /// \brief The number used to indicate this lambda expression for name 578 /// mangling in the Itanium C++ ABI. 579 unsigned ManglingNumber; 580 581 /// \brief The declaration that provides context for this lambda, if the 582 /// actual DeclContext does not suffice. This is used for lambdas that 583 /// occur within default arguments of function parameters within the class 584 /// or within a data member initializer. 585 LazyDeclPtr ContextDecl; 586 587 /// \brief The list of captures, both explicit and implicit, for this 588 /// lambda. 589 Capture *Captures; 590 591 /// \brief The type of the call method. 592 TypeSourceInfo *MethodTyInfo; 593 594 }; 595 596 struct DefinitionData *dataPtr() const { 597 // Complete the redecl chain (if necessary). 598 getMostRecentDecl(); 599 return DefinitionData; 600 } 601 602 struct DefinitionData &data() const { 603 auto *DD = dataPtr(); 604 assert(DD && "queried property of class with no definition"); 605 return *DD; 606 } 607 608 struct LambdaDefinitionData &getLambdaData() const { 609 // No update required: a merged definition cannot change any lambda 610 // properties. 611 auto *DD = DefinitionData; 612 assert(DD && DD->IsLambda && "queried lambda property of non-lambda class"); 613 return static_cast<LambdaDefinitionData&>(*DD); 614 } 615 616 /// \brief The template or declaration that this declaration 617 /// describes or was instantiated from, respectively. 618 /// 619 /// For non-templates, this value will be null. For record 620 /// declarations that describe a class template, this will be a 621 /// pointer to a ClassTemplateDecl. For member 622 /// classes of class template specializations, this will be the 623 /// MemberSpecializationInfo referring to the member class that was 624 /// instantiated or specialized. 625 llvm::PointerUnion<ClassTemplateDecl*, MemberSpecializationInfo*> 626 TemplateOrInstantiation; 627 628 friend class DeclContext; 629 friend class LambdaExpr; 630 631 /// \brief Called from setBases and addedMember to notify the class that a 632 /// direct or virtual base class or a member of class type has been added. 633 void addedClassSubobject(CXXRecordDecl *Base); 634 635 /// \brief Notify the class that member has been added. 636 /// 637 /// This routine helps maintain information about the class based on which 638 /// members have been added. It will be invoked by DeclContext::addDecl() 639 /// whenever a member is added to this record. 640 void addedMember(Decl *D); 641 642 void markedVirtualFunctionPure(); 643 friend void FunctionDecl::setPure(bool); 644 645 friend class ASTNodeImporter; 646 647 /// \brief Get the head of our list of friend declarations, possibly 648 /// deserializing the friends from an external AST source. 649 FriendDecl *getFirstFriend() const; 650 651 protected: 652 CXXRecordDecl(Kind K, TagKind TK, const ASTContext &C, DeclContext *DC, 653 SourceLocation StartLoc, SourceLocation IdLoc, 654 IdentifierInfo *Id, CXXRecordDecl *PrevDecl); 655 656 public: 657 /// \brief Iterator that traverses the base classes of a class. 658 typedef CXXBaseSpecifier* base_class_iterator; 659 660 /// \brief Iterator that traverses the base classes of a class. 661 typedef const CXXBaseSpecifier* base_class_const_iterator; 662 663 CXXRecordDecl *getCanonicalDecl() override { 664 return cast<CXXRecordDecl>(RecordDecl::getCanonicalDecl()); 665 } 666 const CXXRecordDecl *getCanonicalDecl() const { 667 return const_cast<CXXRecordDecl*>(this)->getCanonicalDecl(); 668 } 669 670 CXXRecordDecl *getPreviousDecl() { 671 return cast_or_null<CXXRecordDecl>( 672 static_cast<RecordDecl *>(this)->getPreviousDecl()); 673 } 674 const CXXRecordDecl *getPreviousDecl() const { 675 return const_cast<CXXRecordDecl*>(this)->getPreviousDecl(); 676 } 677 678 CXXRecordDecl *getMostRecentDecl() { 679 return cast<CXXRecordDecl>( 680 static_cast<RecordDecl *>(this)->getMostRecentDecl()); 681 } 682 683 const CXXRecordDecl *getMostRecentDecl() const { 684 return const_cast<CXXRecordDecl*>(this)->getMostRecentDecl(); 685 } 686 687 CXXRecordDecl *getDefinition() const { 688 // We only need an update if we don't already know which 689 // declaration is the definition. 690 auto *DD = DefinitionData ? DefinitionData : dataPtr(); 691 return DD ? DD->Definition : nullptr; 692 } 693 694 bool hasDefinition() const { return DefinitionData || dataPtr(); } 695 696 static CXXRecordDecl *Create(const ASTContext &C, TagKind TK, DeclContext *DC, 697 SourceLocation StartLoc, SourceLocation IdLoc, 698 IdentifierInfo *Id, 699 CXXRecordDecl *PrevDecl = nullptr, 700 bool DelayTypeCreation = false); 701 static CXXRecordDecl *CreateLambda(const ASTContext &C, DeclContext *DC, 702 TypeSourceInfo *Info, SourceLocation Loc, 703 bool DependentLambda, bool IsGeneric, 704 LambdaCaptureDefault CaptureDefault); 705 static CXXRecordDecl *CreateDeserialized(const ASTContext &C, unsigned ID); 706 707 bool isDynamicClass() const { 708 return data().Polymorphic || data().NumVBases != 0; 709 } 710 711 void setIsParsingBaseSpecifiers() { data().IsParsingBaseSpecifiers = true; } 712 713 bool isParsingBaseSpecifiers() const { 714 return data().IsParsingBaseSpecifiers; 715 } 716 717 unsigned getODRHash() const; 718 719 /// \brief Sets the base classes of this struct or class. 720 void setBases(CXXBaseSpecifier const * const *Bases, unsigned NumBases); 721 722 /// \brief Retrieves the number of base classes of this class. 723 unsigned getNumBases() const { return data().NumBases; } 724 725 typedef llvm::iterator_range<base_class_iterator> base_class_range; 726 typedef llvm::iterator_range<base_class_const_iterator> 727 base_class_const_range; 728 729 base_class_range bases() { 730 return base_class_range(bases_begin(), bases_end()); 731 } 732 base_class_const_range bases() const { 733 return base_class_const_range(bases_begin(), bases_end()); 734 } 735 736 base_class_iterator bases_begin() { return data().getBases(); } 737 base_class_const_iterator bases_begin() const { return data().getBases(); } 738 base_class_iterator bases_end() { return bases_begin() + data().NumBases; } 739 base_class_const_iterator bases_end() const { 740 return bases_begin() + data().NumBases; 741 } 742 743 /// \brief Retrieves the number of virtual base classes of this class. 744 unsigned getNumVBases() const { return data().NumVBases; } 745 746 base_class_range vbases() { 747 return base_class_range(vbases_begin(), vbases_end()); 748 } 749 base_class_const_range vbases() const { 750 return base_class_const_range(vbases_begin(), vbases_end()); 751 } 752 753 base_class_iterator vbases_begin() { return data().getVBases(); } 754 base_class_const_iterator vbases_begin() const { return data().getVBases(); } 755 base_class_iterator vbases_end() { return vbases_begin() + data().NumVBases; } 756 base_class_const_iterator vbases_end() const { 757 return vbases_begin() + data().NumVBases; 758 } 759 760 /// \brief Determine whether this class has any dependent base classes which 761 /// are not the current instantiation. 762 bool hasAnyDependentBases() const; 763 764 /// Iterator access to method members. The method iterator visits 765 /// all method members of the class, including non-instance methods, 766 /// special methods, etc. 767 typedef specific_decl_iterator<CXXMethodDecl> method_iterator; 768 typedef llvm::iterator_range<specific_decl_iterator<CXXMethodDecl>> 769 method_range; 770 771 method_range methods() const { 772 return method_range(method_begin(), method_end()); 773 } 774 775 /// \brief Method begin iterator. Iterates in the order the methods 776 /// were declared. 777 method_iterator method_begin() const { 778 return method_iterator(decls_begin()); 779 } 780 /// \brief Method past-the-end iterator. 781 method_iterator method_end() const { 782 return method_iterator(decls_end()); 783 } 784 785 /// Iterator access to constructor members. 786 typedef specific_decl_iterator<CXXConstructorDecl> ctor_iterator; 787 typedef llvm::iterator_range<specific_decl_iterator<CXXConstructorDecl>> 788 ctor_range; 789 790 ctor_range ctors() const { return ctor_range(ctor_begin(), ctor_end()); } 791 792 ctor_iterator ctor_begin() const { 793 return ctor_iterator(decls_begin()); 794 } 795 ctor_iterator ctor_end() const { 796 return ctor_iterator(decls_end()); 797 } 798 799 /// An iterator over friend declarations. All of these are defined 800 /// in DeclFriend.h. 801 class friend_iterator; 802 typedef llvm::iterator_range<friend_iterator> friend_range; 803 804 friend_range friends() const; 805 friend_iterator friend_begin() const; 806 friend_iterator friend_end() const; 807 void pushFriendDecl(FriendDecl *FD); 808 809 /// Determines whether this record has any friends. 810 bool hasFriends() const { 811 return data().FirstFriend.isValid(); 812 } 813 814 /// \brief \c true if we know for sure that this class has a single, 815 /// accessible, unambiguous move constructor that is not deleted. 816 bool hasSimpleMoveConstructor() const { 817 return !hasUserDeclaredMoveConstructor() && hasMoveConstructor() && 818 !data().DefaultedMoveConstructorIsDeleted; 819 } 820 /// \brief \c true if we know for sure that this class has a single, 821 /// accessible, unambiguous move assignment operator that is not deleted. 822 bool hasSimpleMoveAssignment() const { 823 return !hasUserDeclaredMoveAssignment() && hasMoveAssignment() && 824 !data().DefaultedMoveAssignmentIsDeleted; 825 } 826 /// \brief \c true if we know for sure that this class has an accessible 827 /// destructor that is not deleted. 828 bool hasSimpleDestructor() const { 829 return !hasUserDeclaredDestructor() && 830 !data().DefaultedDestructorIsDeleted; 831 } 832 833 /// \brief Determine whether this class has any default constructors. 834 bool hasDefaultConstructor() const { 835 return (data().DeclaredSpecialMembers & SMF_DefaultConstructor) || 836 needsImplicitDefaultConstructor(); 837 } 838 839 /// \brief Determine if we need to declare a default constructor for 840 /// this class. 841 /// 842 /// This value is used for lazy creation of default constructors. 843 bool needsImplicitDefaultConstructor() const { 844 return !data().UserDeclaredConstructor && 845 !(data().DeclaredSpecialMembers & SMF_DefaultConstructor) && 846 // C++14 [expr.prim.lambda]p20: 847 // The closure type associated with a lambda-expression has no 848 // default constructor. 849 !isLambda(); 850 } 851 852 /// \brief Determine whether this class has any user-declared constructors. 853 /// 854 /// When true, a default constructor will not be implicitly declared. 855 bool hasUserDeclaredConstructor() const { 856 return data().UserDeclaredConstructor; 857 } 858 859 /// \brief Whether this class has a user-provided default constructor 860 /// per C++11. 861 bool hasUserProvidedDefaultConstructor() const { 862 return data().UserProvidedDefaultConstructor; 863 } 864 865 /// \brief Determine whether this class has a user-declared copy constructor. 866 /// 867 /// When false, a copy constructor will be implicitly declared. 868 bool hasUserDeclaredCopyConstructor() const { 869 return data().UserDeclaredSpecialMembers & SMF_CopyConstructor; 870 } 871 872 /// \brief Determine whether this class needs an implicit copy 873 /// constructor to be lazily declared. 874 bool needsImplicitCopyConstructor() const { 875 return !(data().DeclaredSpecialMembers & SMF_CopyConstructor); 876 } 877 878 /// \brief Determine whether we need to eagerly declare a defaulted copy 879 /// constructor for this class. 880 bool needsOverloadResolutionForCopyConstructor() const { 881 return data().HasMutableFields; 882 } 883 884 /// \brief Determine whether an implicit copy constructor for this type 885 /// would have a parameter with a const-qualified reference type. 886 bool implicitCopyConstructorHasConstParam() const { 887 return data().ImplicitCopyConstructorCanHaveConstParamForNonVBase && 888 (isAbstract() || 889 data().ImplicitCopyConstructorCanHaveConstParamForVBase); 890 } 891 892 /// \brief Determine whether this class has a copy constructor with 893 /// a parameter type which is a reference to a const-qualified type. 894 bool hasCopyConstructorWithConstParam() const { 895 return data().HasDeclaredCopyConstructorWithConstParam || 896 (needsImplicitCopyConstructor() && 897 implicitCopyConstructorHasConstParam()); 898 } 899 900 /// \brief Whether this class has a user-declared move constructor or 901 /// assignment operator. 902 /// 903 /// When false, a move constructor and assignment operator may be 904 /// implicitly declared. 905 bool hasUserDeclaredMoveOperation() const { 906 return data().UserDeclaredSpecialMembers & 907 (SMF_MoveConstructor | SMF_MoveAssignment); 908 } 909 910 /// \brief Determine whether this class has had a move constructor 911 /// declared by the user. 912 bool hasUserDeclaredMoveConstructor() const { 913 return data().UserDeclaredSpecialMembers & SMF_MoveConstructor; 914 } 915 916 /// \brief Determine whether this class has a move constructor. 917 bool hasMoveConstructor() const { 918 return (data().DeclaredSpecialMembers & SMF_MoveConstructor) || 919 needsImplicitMoveConstructor(); 920 } 921 922 /// \brief Set that we attempted to declare an implicitly move 923 /// constructor, but overload resolution failed so we deleted it. 924 void setImplicitMoveConstructorIsDeleted() { 925 assert((data().DefaultedMoveConstructorIsDeleted || 926 needsOverloadResolutionForMoveConstructor()) && 927 "move constructor should not be deleted"); 928 data().DefaultedMoveConstructorIsDeleted = true; 929 } 930 931 /// \brief Determine whether this class should get an implicit move 932 /// constructor or if any existing special member function inhibits this. 933 bool needsImplicitMoveConstructor() const { 934 return !(data().DeclaredSpecialMembers & SMF_MoveConstructor) && 935 !hasUserDeclaredCopyConstructor() && 936 !hasUserDeclaredCopyAssignment() && 937 !hasUserDeclaredMoveAssignment() && 938 !hasUserDeclaredDestructor(); 939 } 940 941 /// \brief Determine whether we need to eagerly declare a defaulted move 942 /// constructor for this class. 943 bool needsOverloadResolutionForMoveConstructor() const { 944 return data().NeedOverloadResolutionForMoveConstructor; 945 } 946 947 /// \brief Determine whether this class has a user-declared copy assignment 948 /// operator. 949 /// 950 /// When false, a copy assigment operator will be implicitly declared. 951 bool hasUserDeclaredCopyAssignment() const { 952 return data().UserDeclaredSpecialMembers & SMF_CopyAssignment; 953 } 954 955 /// \brief Determine whether this class needs an implicit copy 956 /// assignment operator to be lazily declared. 957 bool needsImplicitCopyAssignment() const { 958 return !(data().DeclaredSpecialMembers & SMF_CopyAssignment); 959 } 960 961 /// \brief Determine whether we need to eagerly declare a defaulted copy 962 /// assignment operator for this class. 963 bool needsOverloadResolutionForCopyAssignment() const { 964 return data().HasMutableFields; 965 } 966 967 /// \brief Determine whether an implicit copy assignment operator for this 968 /// type would have a parameter with a const-qualified reference type. 969 bool implicitCopyAssignmentHasConstParam() const { 970 return data().ImplicitCopyAssignmentHasConstParam; 971 } 972 973 /// \brief Determine whether this class has a copy assignment operator with 974 /// a parameter type which is a reference to a const-qualified type or is not 975 /// a reference. 976 bool hasCopyAssignmentWithConstParam() const { 977 return data().HasDeclaredCopyAssignmentWithConstParam || 978 (needsImplicitCopyAssignment() && 979 implicitCopyAssignmentHasConstParam()); 980 } 981 982 /// \brief Determine whether this class has had a move assignment 983 /// declared by the user. 984 bool hasUserDeclaredMoveAssignment() const { 985 return data().UserDeclaredSpecialMembers & SMF_MoveAssignment; 986 } 987 988 /// \brief Determine whether this class has a move assignment operator. 989 bool hasMoveAssignment() const { 990 return (data().DeclaredSpecialMembers & SMF_MoveAssignment) || 991 needsImplicitMoveAssignment(); 992 } 993 994 /// \brief Set that we attempted to declare an implicit move assignment 995 /// operator, but overload resolution failed so we deleted it. 996 void setImplicitMoveAssignmentIsDeleted() { 997 assert((data().DefaultedMoveAssignmentIsDeleted || 998 needsOverloadResolutionForMoveAssignment()) && 999 "move assignment should not be deleted"); 1000 data().DefaultedMoveAssignmentIsDeleted = true; 1001 } 1002 1003 /// \brief Determine whether this class should get an implicit move 1004 /// assignment operator or if any existing special member function inhibits 1005 /// this. 1006 bool needsImplicitMoveAssignment() const { 1007 return !(data().DeclaredSpecialMembers & SMF_MoveAssignment) && 1008 !hasUserDeclaredCopyConstructor() && 1009 !hasUserDeclaredCopyAssignment() && 1010 !hasUserDeclaredMoveConstructor() && 1011 !hasUserDeclaredDestructor() && 1012 // C++1z [expr.prim.lambda]p21: "the closure type has a deleted copy 1013 // assignment operator". The intent is that this counts as a user 1014 // declared copy assignment, but we do not model it that way. 1015 !isLambda(); 1016 } 1017 1018 /// \brief Determine whether we need to eagerly declare a move assignment 1019 /// operator for this class. 1020 bool needsOverloadResolutionForMoveAssignment() const { 1021 return data().NeedOverloadResolutionForMoveAssignment; 1022 } 1023 1024 /// \brief Determine whether this class has a user-declared destructor. 1025 /// 1026 /// When false, a destructor will be implicitly declared. 1027 bool hasUserDeclaredDestructor() const { 1028 return data().UserDeclaredSpecialMembers & SMF_Destructor; 1029 } 1030 1031 /// \brief Determine whether this class needs an implicit destructor to 1032 /// be lazily declared. 1033 bool needsImplicitDestructor() const { 1034 return !(data().DeclaredSpecialMembers & SMF_Destructor); 1035 } 1036 1037 /// \brief Determine whether we need to eagerly declare a destructor for this 1038 /// class. 1039 bool needsOverloadResolutionForDestructor() const { 1040 return data().NeedOverloadResolutionForDestructor; 1041 } 1042 1043 /// \brief Determine whether this class describes a lambda function object. 1044 bool isLambda() const { 1045 // An update record can't turn a non-lambda into a lambda. 1046 auto *DD = DefinitionData; 1047 return DD && DD->IsLambda; 1048 } 1049 1050 /// \brief Determine whether this class describes a generic 1051 /// lambda function object (i.e. function call operator is 1052 /// a template). 1053 bool isGenericLambda() const; 1054 1055 /// \brief Retrieve the lambda call operator of the closure type 1056 /// if this is a closure type. 1057 CXXMethodDecl *getLambdaCallOperator() const; 1058 1059 /// \brief Retrieve the lambda static invoker, the address of which 1060 /// is returned by the conversion operator, and the body of which 1061 /// is forwarded to the lambda call operator. 1062 CXXMethodDecl *getLambdaStaticInvoker() const; 1063 1064 /// \brief Retrieve the generic lambda's template parameter list. 1065 /// Returns null if the class does not represent a lambda or a generic 1066 /// lambda. 1067 TemplateParameterList *getGenericLambdaTemplateParameterList() const; 1068 1069 LambdaCaptureDefault getLambdaCaptureDefault() const { 1070 assert(isLambda()); 1071 return static_cast<LambdaCaptureDefault>(getLambdaData().CaptureDefault); 1072 } 1073 1074 /// \brief For a closure type, retrieve the mapping from captured 1075 /// variables and \c this to the non-static data members that store the 1076 /// values or references of the captures. 1077 /// 1078 /// \param Captures Will be populated with the mapping from captured 1079 /// variables to the corresponding fields. 1080 /// 1081 /// \param ThisCapture Will be set to the field declaration for the 1082 /// \c this capture. 1083 /// 1084 /// \note No entries will be added for init-captures, as they do not capture 1085 /// variables. 1086 void getCaptureFields(llvm::DenseMap<const VarDecl *, FieldDecl *> &Captures, 1087 FieldDecl *&ThisCapture) const; 1088 1089 typedef const LambdaCapture *capture_const_iterator; 1090 typedef llvm::iterator_range<capture_const_iterator> capture_const_range; 1091 1092 capture_const_range captures() const { 1093 return capture_const_range(captures_begin(), captures_end()); 1094 } 1095 capture_const_iterator captures_begin() const { 1096 return isLambda() ? getLambdaData().Captures : nullptr; 1097 } 1098 capture_const_iterator captures_end() const { 1099 return isLambda() ? captures_begin() + getLambdaData().NumCaptures 1100 : nullptr; 1101 } 1102 1103 typedef UnresolvedSetIterator conversion_iterator; 1104 conversion_iterator conversion_begin() const { 1105 return data().Conversions.get(getASTContext()).begin(); 1106 } 1107 conversion_iterator conversion_end() const { 1108 return data().Conversions.get(getASTContext()).end(); 1109 } 1110 1111 /// Removes a conversion function from this class. The conversion 1112 /// function must currently be a member of this class. Furthermore, 1113 /// this class must currently be in the process of being defined. 1114 void removeConversion(const NamedDecl *Old); 1115 1116 /// \brief Get all conversion functions visible in current class, 1117 /// including conversion function templates. 1118 llvm::iterator_range<conversion_iterator> getVisibleConversionFunctions(); 1119 1120 /// Determine whether this class is an aggregate (C++ [dcl.init.aggr]), 1121 /// which is a class with no user-declared constructors, no private 1122 /// or protected non-static data members, no base classes, and no virtual 1123 /// functions (C++ [dcl.init.aggr]p1). 1124 bool isAggregate() const { return data().Aggregate; } 1125 1126 /// \brief Whether this class has any in-class initializers 1127 /// for non-static data members (including those in anonymous unions or 1128 /// structs). 1129 bool hasInClassInitializer() const { return data().HasInClassInitializer; } 1130 1131 /// \brief Whether this class or any of its subobjects has any members of 1132 /// reference type which would make value-initialization ill-formed. 1133 /// 1134 /// Per C++03 [dcl.init]p5: 1135 /// - if T is a non-union class type without a user-declared constructor, 1136 /// then every non-static data member and base-class component of T is 1137 /// value-initialized [...] A program that calls for [...] 1138 /// value-initialization of an entity of reference type is ill-formed. 1139 bool hasUninitializedReferenceMember() const { 1140 return !isUnion() && !hasUserDeclaredConstructor() && 1141 data().HasUninitializedReferenceMember; 1142 } 1143 1144 /// \brief Whether this class is a POD-type (C++ [class]p4) 1145 /// 1146 /// For purposes of this function a class is POD if it is an aggregate 1147 /// that has no non-static non-POD data members, no reference data 1148 /// members, no user-defined copy assignment operator and no 1149 /// user-defined destructor. 1150 /// 1151 /// Note that this is the C++ TR1 definition of POD. 1152 bool isPOD() const { return data().PlainOldData; } 1153 1154 /// \brief True if this class is C-like, without C++-specific features, e.g. 1155 /// it contains only public fields, no bases, tag kind is not 'class', etc. 1156 bool isCLike() const; 1157 1158 /// \brief Determine whether this is an empty class in the sense of 1159 /// (C++11 [meta.unary.prop]). 1160 /// 1161 /// The CXXRecordDecl is a class type, but not a union type, 1162 /// with no non-static data members other than bit-fields of length 0, 1163 /// no virtual member functions, no virtual base classes, 1164 /// and no base class B for which is_empty<B>::value is false. 1165 /// 1166 /// \note This does NOT include a check for union-ness. 1167 bool isEmpty() const { return data().Empty; } 1168 1169 /// \brief Determine whether this class has direct non-static data members. 1170 bool hasDirectFields() const { 1171 auto &D = data(); 1172 return D.HasPublicFields || D.HasProtectedFields || D.HasPrivateFields; 1173 } 1174 1175 /// Whether this class is polymorphic (C++ [class.virtual]), 1176 /// which means that the class contains or inherits a virtual function. 1177 bool isPolymorphic() const { return data().Polymorphic; } 1178 1179 /// \brief Determine whether this class has a pure virtual function. 1180 /// 1181 /// The class is is abstract per (C++ [class.abstract]p2) if it declares 1182 /// a pure virtual function or inherits a pure virtual function that is 1183 /// not overridden. 1184 bool isAbstract() const { return data().Abstract; } 1185 1186 /// \brief Determine whether this class has standard layout per 1187 /// (C++ [class]p7) 1188 bool isStandardLayout() const { return data().IsStandardLayout; } 1189 1190 /// \brief Determine whether this class, or any of its class subobjects, 1191 /// contains a mutable field. 1192 bool hasMutableFields() const { return data().HasMutableFields; } 1193 1194 /// \brief Determine whether this class has any variant members. 1195 bool hasVariantMembers() const { return data().HasVariantMembers; } 1196 1197 /// \brief Determine whether this class has a trivial default constructor 1198 /// (C++11 [class.ctor]p5). 1199 bool hasTrivialDefaultConstructor() const { 1200 return hasDefaultConstructor() && 1201 (data().HasTrivialSpecialMembers & SMF_DefaultConstructor); 1202 } 1203 1204 /// \brief Determine whether this class has a non-trivial default constructor 1205 /// (C++11 [class.ctor]p5). 1206 bool hasNonTrivialDefaultConstructor() const { 1207 return (data().DeclaredNonTrivialSpecialMembers & SMF_DefaultConstructor) || 1208 (needsImplicitDefaultConstructor() && 1209 !(data().HasTrivialSpecialMembers & SMF_DefaultConstructor)); 1210 } 1211 1212 /// \brief Determine whether this class has at least one constexpr constructor 1213 /// other than the copy or move constructors. 1214 bool hasConstexprNonCopyMoveConstructor() const { 1215 return data().HasConstexprNonCopyMoveConstructor || 1216 (needsImplicitDefaultConstructor() && 1217 defaultedDefaultConstructorIsConstexpr()); 1218 } 1219 1220 /// \brief Determine whether a defaulted default constructor for this class 1221 /// would be constexpr. 1222 bool defaultedDefaultConstructorIsConstexpr() const { 1223 return data().DefaultedDefaultConstructorIsConstexpr && 1224 (!isUnion() || hasInClassInitializer() || !hasVariantMembers()); 1225 } 1226 1227 /// \brief Determine whether this class has a constexpr default constructor. 1228 bool hasConstexprDefaultConstructor() const { 1229 return data().HasConstexprDefaultConstructor || 1230 (needsImplicitDefaultConstructor() && 1231 defaultedDefaultConstructorIsConstexpr()); 1232 } 1233 1234 /// \brief Determine whether this class has a trivial copy constructor 1235 /// (C++ [class.copy]p6, C++11 [class.copy]p12) 1236 bool hasTrivialCopyConstructor() const { 1237 return data().HasTrivialSpecialMembers & SMF_CopyConstructor; 1238 } 1239 1240 /// \brief Determine whether this class has a non-trivial copy constructor 1241 /// (C++ [class.copy]p6, C++11 [class.copy]p12) 1242 bool hasNonTrivialCopyConstructor() const { 1243 return data().DeclaredNonTrivialSpecialMembers & SMF_CopyConstructor || 1244 !hasTrivialCopyConstructor(); 1245 } 1246 1247 /// \brief Determine whether this class has a trivial move constructor 1248 /// (C++11 [class.copy]p12) 1249 bool hasTrivialMoveConstructor() const { 1250 return hasMoveConstructor() && 1251 (data().HasTrivialSpecialMembers & SMF_MoveConstructor); 1252 } 1253 1254 /// \brief Determine whether this class has a non-trivial move constructor 1255 /// (C++11 [class.copy]p12) 1256 bool hasNonTrivialMoveConstructor() const { 1257 return (data().DeclaredNonTrivialSpecialMembers & SMF_MoveConstructor) || 1258 (needsImplicitMoveConstructor() && 1259 !(data().HasTrivialSpecialMembers & SMF_MoveConstructor)); 1260 } 1261 1262 /// \brief Determine whether this class has a trivial copy assignment operator 1263 /// (C++ [class.copy]p11, C++11 [class.copy]p25) 1264 bool hasTrivialCopyAssignment() const { 1265 return data().HasTrivialSpecialMembers & SMF_CopyAssignment; 1266 } 1267 1268 /// \brief Determine whether this class has a non-trivial copy assignment 1269 /// operator (C++ [class.copy]p11, C++11 [class.copy]p25) 1270 bool hasNonTrivialCopyAssignment() const { 1271 return data().DeclaredNonTrivialSpecialMembers & SMF_CopyAssignment || 1272 !hasTrivialCopyAssignment(); 1273 } 1274 1275 /// \brief Determine whether this class has a trivial move assignment operator 1276 /// (C++11 [class.copy]p25) 1277 bool hasTrivialMoveAssignment() const { 1278 return hasMoveAssignment() && 1279 (data().HasTrivialSpecialMembers & SMF_MoveAssignment); 1280 } 1281 1282 /// \brief Determine whether this class has a non-trivial move assignment 1283 /// operator (C++11 [class.copy]p25) 1284 bool hasNonTrivialMoveAssignment() const { 1285 return (data().DeclaredNonTrivialSpecialMembers & SMF_MoveAssignment) || 1286 (needsImplicitMoveAssignment() && 1287 !(data().HasTrivialSpecialMembers & SMF_MoveAssignment)); 1288 } 1289 1290 /// \brief Determine whether this class has a trivial destructor 1291 /// (C++ [class.dtor]p3) 1292 bool hasTrivialDestructor() const { 1293 return data().HasTrivialSpecialMembers & SMF_Destructor; 1294 } 1295 1296 /// \brief Determine whether this class has a non-trivial destructor 1297 /// (C++ [class.dtor]p3) 1298 bool hasNonTrivialDestructor() const { 1299 return !(data().HasTrivialSpecialMembers & SMF_Destructor); 1300 } 1301 1302 /// \brief Determine whether declaring a const variable with this type is ok 1303 /// per core issue 253. 1304 bool allowConstDefaultInit() const { 1305 return !data().HasUninitializedFields || 1306 !(data().HasDefaultedDefaultConstructor || 1307 needsImplicitDefaultConstructor()); 1308 } 1309 1310 /// \brief Determine whether this class has a destructor which has no 1311 /// semantic effect. 1312 /// 1313 /// Any such destructor will be trivial, public, defaulted and not deleted, 1314 /// and will call only irrelevant destructors. 1315 bool hasIrrelevantDestructor() const { 1316 return data().HasIrrelevantDestructor; 1317 } 1318 1319 /// \brief Determine whether this class has a non-literal or/ volatile type 1320 /// non-static data member or base class. 1321 bool hasNonLiteralTypeFieldsOrBases() const { 1322 return data().HasNonLiteralTypeFieldsOrBases; 1323 } 1324 1325 /// \brief Determine whether this class has a using-declaration that names 1326 /// a user-declared base class constructor. 1327 bool hasInheritedConstructor() const { 1328 return data().HasInheritedConstructor; 1329 } 1330 1331 /// \brief Determine whether this class has a using-declaration that names 1332 /// a base class assignment operator. 1333 bool hasInheritedAssignment() const { 1334 return data().HasInheritedAssignment; 1335 } 1336 1337 /// \brief Determine whether this class is considered trivially copyable per 1338 /// (C++11 [class]p6). 1339 bool isTriviallyCopyable() const; 1340 1341 /// \brief Determine whether this class is considered trivial. 1342 /// 1343 /// C++11 [class]p6: 1344 /// "A trivial class is a class that has a trivial default constructor and 1345 /// is trivially copiable." 1346 bool isTrivial() const { 1347 return isTriviallyCopyable() && hasTrivialDefaultConstructor(); 1348 } 1349 1350 /// \brief Determine whether this class is a literal type. 1351 /// 1352 /// C++11 [basic.types]p10: 1353 /// A class type that has all the following properties: 1354 /// - it has a trivial destructor 1355 /// - every constructor call and full-expression in the 1356 /// brace-or-equal-intializers for non-static data members (if any) is 1357 /// a constant expression. 1358 /// - it is an aggregate type or has at least one constexpr constructor 1359 /// or constructor template that is not a copy or move constructor, and 1360 /// - all of its non-static data members and base classes are of literal 1361 /// types 1362 /// 1363 /// We resolve DR1361 by ignoring the second bullet. We resolve DR1452 by 1364 /// treating types with trivial default constructors as literal types. 1365 /// 1366 /// Only in C++1z and beyond, are lambdas literal types. 1367 bool isLiteral() const { 1368 return hasTrivialDestructor() && 1369 (!isLambda() || getASTContext().getLangOpts().CPlusPlus1z) && 1370 !hasNonLiteralTypeFieldsOrBases() && 1371 (isAggregate() || isLambda() || 1372 hasConstexprNonCopyMoveConstructor() || 1373 hasTrivialDefaultConstructor()); 1374 } 1375 1376 /// \brief If this record is an instantiation of a member class, 1377 /// retrieves the member class from which it was instantiated. 1378 /// 1379 /// This routine will return non-null for (non-templated) member 1380 /// classes of class templates. For example, given: 1381 /// 1382 /// \code 1383 /// template<typename T> 1384 /// struct X { 1385 /// struct A { }; 1386 /// }; 1387 /// \endcode 1388 /// 1389 /// The declaration for X<int>::A is a (non-templated) CXXRecordDecl 1390 /// whose parent is the class template specialization X<int>. For 1391 /// this declaration, getInstantiatedFromMemberClass() will return 1392 /// the CXXRecordDecl X<T>::A. When a complete definition of 1393 /// X<int>::A is required, it will be instantiated from the 1394 /// declaration returned by getInstantiatedFromMemberClass(). 1395 CXXRecordDecl *getInstantiatedFromMemberClass() const; 1396 1397 /// \brief If this class is an instantiation of a member class of a 1398 /// class template specialization, retrieves the member specialization 1399 /// information. 1400 MemberSpecializationInfo *getMemberSpecializationInfo() const; 1401 1402 /// \brief Specify that this record is an instantiation of the 1403 /// member class \p RD. 1404 void setInstantiationOfMemberClass(CXXRecordDecl *RD, 1405 TemplateSpecializationKind TSK); 1406 1407 /// \brief Retrieves the class template that is described by this 1408 /// class declaration. 1409 /// 1410 /// Every class template is represented as a ClassTemplateDecl and a 1411 /// CXXRecordDecl. The former contains template properties (such as 1412 /// the template parameter lists) while the latter contains the 1413 /// actual description of the template's 1414 /// contents. ClassTemplateDecl::getTemplatedDecl() retrieves the 1415 /// CXXRecordDecl that from a ClassTemplateDecl, while 1416 /// getDescribedClassTemplate() retrieves the ClassTemplateDecl from 1417 /// a CXXRecordDecl. 1418 ClassTemplateDecl *getDescribedClassTemplate() const; 1419 1420 void setDescribedClassTemplate(ClassTemplateDecl *Template); 1421 1422 /// \brief Determine whether this particular class is a specialization or 1423 /// instantiation of a class template or member class of a class template, 1424 /// and how it was instantiated or specialized. 1425 TemplateSpecializationKind getTemplateSpecializationKind() const; 1426 1427 /// \brief Set the kind of specialization or template instantiation this is. 1428 void setTemplateSpecializationKind(TemplateSpecializationKind TSK); 1429 1430 /// \brief Retrieve the record declaration from which this record could be 1431 /// instantiated. Returns null if this class is not a template instantiation. 1432 const CXXRecordDecl *getTemplateInstantiationPattern() const; 1433 1434 CXXRecordDecl *getTemplateInstantiationPattern() { 1435 return const_cast<CXXRecordDecl *>(const_cast<const CXXRecordDecl *>(this) 1436 ->getTemplateInstantiationPattern()); 1437 } 1438 1439 /// \brief Returns the destructor decl for this class. 1440 CXXDestructorDecl *getDestructor() const; 1441 1442 /// \brief Returns true if the class destructor, or any implicitly invoked 1443 /// destructors are marked noreturn. 1444 bool isAnyDestructorNoReturn() const; 1445 1446 /// \brief If the class is a local class [class.local], returns 1447 /// the enclosing function declaration. 1448 const FunctionDecl *isLocalClass() const { 1449 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(getDeclContext())) 1450 return RD->isLocalClass(); 1451 1452 return dyn_cast<FunctionDecl>(getDeclContext()); 1453 } 1454 1455 FunctionDecl *isLocalClass() { 1456 return const_cast<FunctionDecl*>( 1457 const_cast<const CXXRecordDecl*>(this)->isLocalClass()); 1458 } 1459 1460 /// \brief Determine whether this dependent class is a current instantiation, 1461 /// when viewed from within the given context. 1462 bool isCurrentInstantiation(const DeclContext *CurContext) const; 1463 1464 /// \brief Determine whether this class is derived from the class \p Base. 1465 /// 1466 /// This routine only determines whether this class is derived from \p Base, 1467 /// but does not account for factors that may make a Derived -> Base class 1468 /// ill-formed, such as private/protected inheritance or multiple, ambiguous 1469 /// base class subobjects. 1470 /// 1471 /// \param Base the base class we are searching for. 1472 /// 1473 /// \returns true if this class is derived from Base, false otherwise. 1474 bool isDerivedFrom(const CXXRecordDecl *Base) const; 1475 1476 /// \brief Determine whether this class is derived from the type \p Base. 1477 /// 1478 /// This routine only determines whether this class is derived from \p Base, 1479 /// but does not account for factors that may make a Derived -> Base class 1480 /// ill-formed, such as private/protected inheritance or multiple, ambiguous 1481 /// base class subobjects. 1482 /// 1483 /// \param Base the base class we are searching for. 1484 /// 1485 /// \param Paths will contain the paths taken from the current class to the 1486 /// given \p Base class. 1487 /// 1488 /// \returns true if this class is derived from \p Base, false otherwise. 1489 /// 1490 /// \todo add a separate parameter to configure IsDerivedFrom, rather than 1491 /// tangling input and output in \p Paths 1492 bool isDerivedFrom(const CXXRecordDecl *Base, CXXBasePaths &Paths) const; 1493 1494 /// \brief Determine whether this class is virtually derived from 1495 /// the class \p Base. 1496 /// 1497 /// This routine only determines whether this class is virtually 1498 /// derived from \p Base, but does not account for factors that may 1499 /// make a Derived -> Base class ill-formed, such as 1500 /// private/protected inheritance or multiple, ambiguous base class 1501 /// subobjects. 1502 /// 1503 /// \param Base the base class we are searching for. 1504 /// 1505 /// \returns true if this class is virtually derived from Base, 1506 /// false otherwise. 1507 bool isVirtuallyDerivedFrom(const CXXRecordDecl *Base) const; 1508 1509 /// \brief Determine whether this class is provably not derived from 1510 /// the type \p Base. 1511 bool isProvablyNotDerivedFrom(const CXXRecordDecl *Base) const; 1512 1513 /// \brief Function type used by forallBases() as a callback. 1514 /// 1515 /// \param BaseDefinition the definition of the base class 1516 /// 1517 /// \returns true if this base matched the search criteria 1518 typedef llvm::function_ref<bool(const CXXRecordDecl *BaseDefinition)> 1519 ForallBasesCallback; 1520 1521 /// \brief Determines if the given callback holds for all the direct 1522 /// or indirect base classes of this type. 1523 /// 1524 /// The class itself does not count as a base class. This routine 1525 /// returns false if the class has non-computable base classes. 1526 /// 1527 /// \param BaseMatches Callback invoked for each (direct or indirect) base 1528 /// class of this type, or if \p AllowShortCircuit is true then until a call 1529 /// returns false. 1530 /// 1531 /// \param AllowShortCircuit if false, forces the callback to be called 1532 /// for every base class, even if a dependent or non-matching base was 1533 /// found. 1534 bool forallBases(ForallBasesCallback BaseMatches, 1535 bool AllowShortCircuit = true) const; 1536 1537 /// \brief Function type used by lookupInBases() to determine whether a 1538 /// specific base class subobject matches the lookup criteria. 1539 /// 1540 /// \param Specifier the base-class specifier that describes the inheritance 1541 /// from the base class we are trying to match. 1542 /// 1543 /// \param Path the current path, from the most-derived class down to the 1544 /// base named by the \p Specifier. 1545 /// 1546 /// \returns true if this base matched the search criteria, false otherwise. 1547 typedef llvm::function_ref<bool(const CXXBaseSpecifier *Specifier, 1548 CXXBasePath &Path)> BaseMatchesCallback; 1549 1550 /// \brief Look for entities within the base classes of this C++ class, 1551 /// transitively searching all base class subobjects. 1552 /// 1553 /// This routine uses the callback function \p BaseMatches to find base 1554 /// classes meeting some search criteria, walking all base class subobjects 1555 /// and populating the given \p Paths structure with the paths through the 1556 /// inheritance hierarchy that resulted in a match. On a successful search, 1557 /// the \p Paths structure can be queried to retrieve the matching paths and 1558 /// to determine if there were any ambiguities. 1559 /// 1560 /// \param BaseMatches callback function used to determine whether a given 1561 /// base matches the user-defined search criteria. 1562 /// 1563 /// \param Paths used to record the paths from this class to its base class 1564 /// subobjects that match the search criteria. 1565 /// 1566 /// \returns true if there exists any path from this class to a base class 1567 /// subobject that matches the search criteria. 1568 bool lookupInBases(BaseMatchesCallback BaseMatches, 1569 CXXBasePaths &Paths) const; 1570 1571 /// \brief Base-class lookup callback that determines whether the given 1572 /// base class specifier refers to a specific class declaration. 1573 /// 1574 /// This callback can be used with \c lookupInBases() to determine whether 1575 /// a given derived class has is a base class subobject of a particular type. 1576 /// The base record pointer should refer to the canonical CXXRecordDecl of the 1577 /// base class that we are searching for. 1578 static bool FindBaseClass(const CXXBaseSpecifier *Specifier, 1579 CXXBasePath &Path, const CXXRecordDecl *BaseRecord); 1580 1581 /// \brief Base-class lookup callback that determines whether the 1582 /// given base class specifier refers to a specific class 1583 /// declaration and describes virtual derivation. 1584 /// 1585 /// This callback can be used with \c lookupInBases() to determine 1586 /// whether a given derived class has is a virtual base class 1587 /// subobject of a particular type. The base record pointer should 1588 /// refer to the canonical CXXRecordDecl of the base class that we 1589 /// are searching for. 1590 static bool FindVirtualBaseClass(const CXXBaseSpecifier *Specifier, 1591 CXXBasePath &Path, 1592 const CXXRecordDecl *BaseRecord); 1593 1594 /// \brief Base-class lookup callback that determines whether there exists 1595 /// a tag with the given name. 1596 /// 1597 /// This callback can be used with \c lookupInBases() to find tag members 1598 /// of the given name within a C++ class hierarchy. 1599 static bool FindTagMember(const CXXBaseSpecifier *Specifier, 1600 CXXBasePath &Path, DeclarationName Name); 1601 1602 /// \brief Base-class lookup callback that determines whether there exists 1603 /// a member with the given name. 1604 /// 1605 /// This callback can be used with \c lookupInBases() to find members 1606 /// of the given name within a C++ class hierarchy. 1607 static bool FindOrdinaryMember(const CXXBaseSpecifier *Specifier, 1608 CXXBasePath &Path, DeclarationName Name); 1609 1610 /// \brief Base-class lookup callback that determines whether there exists 1611 /// an OpenMP declare reduction member with the given name. 1612 /// 1613 /// This callback can be used with \c lookupInBases() to find members 1614 /// of the given name within a C++ class hierarchy. 1615 static bool FindOMPReductionMember(const CXXBaseSpecifier *Specifier, 1616 CXXBasePath &Path, DeclarationName Name); 1617 1618 /// \brief Base-class lookup callback that determines whether there exists 1619 /// a member with the given name that can be used in a nested-name-specifier. 1620 /// 1621 /// This callback can be used with \c lookupInBases() to find members of 1622 /// the given name within a C++ class hierarchy that can occur within 1623 /// nested-name-specifiers. 1624 static bool FindNestedNameSpecifierMember(const CXXBaseSpecifier *Specifier, 1625 CXXBasePath &Path, 1626 DeclarationName Name); 1627 1628 /// \brief Retrieve the final overriders for each virtual member 1629 /// function in the class hierarchy where this class is the 1630 /// most-derived class in the class hierarchy. 1631 void getFinalOverriders(CXXFinalOverriderMap &FinaOverriders) const; 1632 1633 /// \brief Get the indirect primary bases for this class. 1634 void getIndirectPrimaryBases(CXXIndirectPrimaryBaseSet& Bases) const; 1635 1636 /// Renders and displays an inheritance diagram 1637 /// for this C++ class and all of its base classes (transitively) using 1638 /// GraphViz. 1639 void viewInheritance(ASTContext& Context) const; 1640 1641 /// \brief Calculates the access of a decl that is reached 1642 /// along a path. 1643 static AccessSpecifier MergeAccess(AccessSpecifier PathAccess, 1644 AccessSpecifier DeclAccess) { 1645 assert(DeclAccess != AS_none); 1646 if (DeclAccess == AS_private) return AS_none; 1647 return (PathAccess > DeclAccess ? PathAccess : DeclAccess); 1648 } 1649 1650 /// \brief Indicates that the declaration of a defaulted or deleted special 1651 /// member function is now complete. 1652 void finishedDefaultedOrDeletedMember(CXXMethodDecl *MD); 1653 1654 /// \brief Indicates that the definition of this class is now complete. 1655 void completeDefinition() override; 1656 1657 /// \brief Indicates that the definition of this class is now complete, 1658 /// and provides a final overrider map to help determine 1659 /// 1660 /// \param FinalOverriders The final overrider map for this class, which can 1661 /// be provided as an optimization for abstract-class checking. If NULL, 1662 /// final overriders will be computed if they are needed to complete the 1663 /// definition. 1664 void completeDefinition(CXXFinalOverriderMap *FinalOverriders); 1665 1666 /// \brief Determine whether this class may end up being abstract, even though 1667 /// it is not yet known to be abstract. 1668 /// 1669 /// \returns true if this class is not known to be abstract but has any 1670 /// base classes that are abstract. In this case, \c completeDefinition() 1671 /// will need to compute final overriders to determine whether the class is 1672 /// actually abstract. 1673 bool mayBeAbstract() const; 1674 1675 /// \brief If this is the closure type of a lambda expression, retrieve the 1676 /// number to be used for name mangling in the Itanium C++ ABI. 1677 /// 1678 /// Zero indicates that this closure type has internal linkage, so the 1679 /// mangling number does not matter, while a non-zero value indicates which 1680 /// lambda expression this is in this particular context. 1681 unsigned getLambdaManglingNumber() const { 1682 assert(isLambda() && "Not a lambda closure type!"); 1683 return getLambdaData().ManglingNumber; 1684 } 1685 1686 /// \brief Retrieve the declaration that provides additional context for a 1687 /// lambda, when the normal declaration context is not specific enough. 1688 /// 1689 /// Certain contexts (default arguments of in-class function parameters and 1690 /// the initializers of data members) have separate name mangling rules for 1691 /// lambdas within the Itanium C++ ABI. For these cases, this routine provides 1692 /// the declaration in which the lambda occurs, e.g., the function parameter 1693 /// or the non-static data member. Otherwise, it returns NULL to imply that 1694 /// the declaration context suffices. 1695 Decl *getLambdaContextDecl() const; 1696 1697 /// \brief Set the mangling number and context declaration for a lambda 1698 /// class. 1699 void setLambdaMangling(unsigned ManglingNumber, Decl *ContextDecl) { 1700 getLambdaData().ManglingNumber = ManglingNumber; 1701 getLambdaData().ContextDecl = ContextDecl; 1702 } 1703 1704 /// \brief Returns the inheritance model used for this record. 1705 MSInheritanceAttr::Spelling getMSInheritanceModel() const; 1706 /// \brief Calculate what the inheritance model would be for this class. 1707 MSInheritanceAttr::Spelling calculateInheritanceModel() const; 1708 1709 /// In the Microsoft C++ ABI, use zero for the field offset of a null data 1710 /// member pointer if we can guarantee that zero is not a valid field offset, 1711 /// or if the member pointer has multiple fields. Polymorphic classes have a 1712 /// vfptr at offset zero, so we can use zero for null. If there are multiple 1713 /// fields, we can use zero even if it is a valid field offset because 1714 /// null-ness testing will check the other fields. 1715 bool nullFieldOffsetIsZero() const { 1716 return !MSInheritanceAttr::hasOnlyOneField(/*IsMemberFunction=*/false, 1717 getMSInheritanceModel()) || 1718 (hasDefinition() && isPolymorphic()); 1719 } 1720 1721 /// \brief Controls when vtordisps will be emitted if this record is used as a 1722 /// virtual base. 1723 MSVtorDispAttr::Mode getMSVtorDispMode() const; 1724 1725 /// \brief Determine whether this lambda expression was known to be dependent 1726 /// at the time it was created, even if its context does not appear to be 1727 /// dependent. 1728 /// 1729 /// This flag is a workaround for an issue with parsing, where default 1730 /// arguments are parsed before their enclosing function declarations have 1731 /// been created. This means that any lambda expressions within those 1732 /// default arguments will have as their DeclContext the context enclosing 1733 /// the function declaration, which may be non-dependent even when the 1734 /// function declaration itself is dependent. This flag indicates when we 1735 /// know that the lambda is dependent despite that. 1736 bool isDependentLambda() const { 1737 return isLambda() && getLambdaData().Dependent; 1738 } 1739 1740 TypeSourceInfo *getLambdaTypeInfo() const { 1741 return getLambdaData().MethodTyInfo; 1742 } 1743 1744 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 1745 static bool classofKind(Kind K) { 1746 return K >= firstCXXRecord && K <= lastCXXRecord; 1747 } 1748 1749 friend class ASTDeclReader; 1750 friend class ASTDeclWriter; 1751 friend class ASTRecordWriter; 1752 friend class ASTReader; 1753 friend class ASTWriter; 1754 }; 1755 1756 /// \brief Represents a C++ deduction guide declaration. 1757 /// 1758 /// \code 1759 /// template<typename T> struct A { A(); A(T); }; 1760 /// A() -> A<int>; 1761 /// \endcode 1762 /// 1763 /// In this example, there will be an explicit deduction guide from the 1764 /// second line, and implicit deduction guide templates synthesized from 1765 /// the constructors of \c A. 1766 class CXXDeductionGuideDecl : public FunctionDecl { 1767 void anchor() override; 1768 private: 1769 CXXDeductionGuideDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, 1770 bool IsExplicit, const DeclarationNameInfo &NameInfo, 1771 QualType T, TypeSourceInfo *TInfo, 1772 SourceLocation EndLocation) 1773 : FunctionDecl(CXXDeductionGuide, C, DC, StartLoc, NameInfo, T, TInfo, 1774 SC_None, false, false) { 1775 if (EndLocation.isValid()) 1776 setRangeEnd(EndLocation); 1777 IsExplicitSpecified = IsExplicit; 1778 } 1779 1780 public: 1781 static CXXDeductionGuideDecl *Create(ASTContext &C, DeclContext *DC, 1782 SourceLocation StartLoc, bool IsExplicit, 1783 const DeclarationNameInfo &NameInfo, 1784 QualType T, TypeSourceInfo *TInfo, 1785 SourceLocation EndLocation); 1786 1787 static CXXDeductionGuideDecl *CreateDeserialized(ASTContext &C, unsigned ID); 1788 1789 /// Whether this deduction guide is explicit. 1790 bool isExplicit() const { return IsExplicitSpecified; } 1791 1792 /// Whether this deduction guide was declared with the 'explicit' specifier. 1793 bool isExplicitSpecified() const { return IsExplicitSpecified; } 1794 1795 /// Get the template for which this guide performs deduction. 1796 TemplateDecl *getDeducedTemplate() const { 1797 return getDeclName().getCXXDeductionGuideTemplate(); 1798 } 1799 1800 // Implement isa/cast/dyncast/etc. 1801 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 1802 static bool classofKind(Kind K) { return K == CXXDeductionGuide; } 1803 1804 friend class ASTDeclReader; 1805 friend class ASTDeclWriter; 1806 }; 1807 1808 /// \brief Represents a static or instance method of a struct/union/class. 1809 /// 1810 /// In the terminology of the C++ Standard, these are the (static and 1811 /// non-static) member functions, whether virtual or not. 1812 class CXXMethodDecl : public FunctionDecl { 1813 void anchor() override; 1814 protected: 1815 CXXMethodDecl(Kind DK, ASTContext &C, CXXRecordDecl *RD, 1816 SourceLocation StartLoc, const DeclarationNameInfo &NameInfo, 1817 QualType T, TypeSourceInfo *TInfo, 1818 StorageClass SC, bool isInline, 1819 bool isConstexpr, SourceLocation EndLocation) 1820 : FunctionDecl(DK, C, RD, StartLoc, NameInfo, T, TInfo, 1821 SC, isInline, isConstexpr) { 1822 if (EndLocation.isValid()) 1823 setRangeEnd(EndLocation); 1824 } 1825 1826 public: 1827 static CXXMethodDecl *Create(ASTContext &C, CXXRecordDecl *RD, 1828 SourceLocation StartLoc, 1829 const DeclarationNameInfo &NameInfo, 1830 QualType T, TypeSourceInfo *TInfo, 1831 StorageClass SC, 1832 bool isInline, 1833 bool isConstexpr, 1834 SourceLocation EndLocation); 1835 1836 static CXXMethodDecl *CreateDeserialized(ASTContext &C, unsigned ID); 1837 1838 bool isStatic() const; 1839 bool isInstance() const { return !isStatic(); } 1840 1841 /// Returns true if the given operator is implicitly static in a record 1842 /// context. 1843 static bool isStaticOverloadedOperator(OverloadedOperatorKind OOK) { 1844 // [class.free]p1: 1845 // Any allocation function for a class T is a static member 1846 // (even if not explicitly declared static). 1847 // [class.free]p6 Any deallocation function for a class X is a static member 1848 // (even if not explicitly declared static). 1849 return OOK == OO_New || OOK == OO_Array_New || OOK == OO_Delete || 1850 OOK == OO_Array_Delete; 1851 } 1852 1853 bool isConst() const { return getType()->castAs<FunctionType>()->isConst(); } 1854 bool isVolatile() const { return getType()->castAs<FunctionType>()->isVolatile(); } 1855 1856 bool isVirtual() const { 1857 CXXMethodDecl *CD = 1858 cast<CXXMethodDecl>(const_cast<CXXMethodDecl*>(this)->getCanonicalDecl()); 1859 1860 // Member function is virtual if it is marked explicitly so, or if it is 1861 // declared in __interface -- then it is automatically pure virtual. 1862 if (CD->isVirtualAsWritten() || CD->isPure()) 1863 return true; 1864 1865 return (CD->begin_overridden_methods() != CD->end_overridden_methods()); 1866 } 1867 1868 /// \brief Determine whether this is a usual deallocation function 1869 /// (C++ [basic.stc.dynamic.deallocation]p2), which is an overloaded 1870 /// delete or delete[] operator with a particular signature. 1871 bool isUsualDeallocationFunction() const; 1872 1873 /// \brief Determine whether this is a copy-assignment operator, regardless 1874 /// of whether it was declared implicitly or explicitly. 1875 bool isCopyAssignmentOperator() const; 1876 1877 /// \brief Determine whether this is a move assignment operator. 1878 bool isMoveAssignmentOperator() const; 1879 1880 CXXMethodDecl *getCanonicalDecl() override { 1881 return cast<CXXMethodDecl>(FunctionDecl::getCanonicalDecl()); 1882 } 1883 const CXXMethodDecl *getCanonicalDecl() const { 1884 return const_cast<CXXMethodDecl*>(this)->getCanonicalDecl(); 1885 } 1886 1887 CXXMethodDecl *getMostRecentDecl() { 1888 return cast<CXXMethodDecl>( 1889 static_cast<FunctionDecl *>(this)->getMostRecentDecl()); 1890 } 1891 const CXXMethodDecl *getMostRecentDecl() const { 1892 return const_cast<CXXMethodDecl*>(this)->getMostRecentDecl(); 1893 } 1894 1895 /// True if this method is user-declared and was not 1896 /// deleted or defaulted on its first declaration. 1897 bool isUserProvided() const { 1898 return !(isDeleted() || getCanonicalDecl()->isDefaulted()); 1899 } 1900 1901 /// 1902 void addOverriddenMethod(const CXXMethodDecl *MD); 1903 1904 typedef const CXXMethodDecl *const* method_iterator; 1905 1906 method_iterator begin_overridden_methods() const; 1907 method_iterator end_overridden_methods() const; 1908 unsigned size_overridden_methods() const; 1909 typedef ASTContext::overridden_method_range overridden_method_range; 1910 overridden_method_range overridden_methods() const; 1911 1912 /// Returns the parent of this method declaration, which 1913 /// is the class in which this method is defined. 1914 const CXXRecordDecl *getParent() const { 1915 return cast<CXXRecordDecl>(FunctionDecl::getParent()); 1916 } 1917 1918 /// Returns the parent of this method declaration, which 1919 /// is the class in which this method is defined. 1920 CXXRecordDecl *getParent() { 1921 return const_cast<CXXRecordDecl *>( 1922 cast<CXXRecordDecl>(FunctionDecl::getParent())); 1923 } 1924 1925 /// \brief Returns the type of the \c this pointer. 1926 /// 1927 /// Should only be called for instance (i.e., non-static) methods. 1928 QualType getThisType(ASTContext &C) const; 1929 1930 unsigned getTypeQualifiers() const { 1931 return getType()->getAs<FunctionProtoType>()->getTypeQuals(); 1932 } 1933 1934 /// \brief Retrieve the ref-qualifier associated with this method. 1935 /// 1936 /// In the following example, \c f() has an lvalue ref-qualifier, \c g() 1937 /// has an rvalue ref-qualifier, and \c h() has no ref-qualifier. 1938 /// @code 1939 /// struct X { 1940 /// void f() &; 1941 /// void g() &&; 1942 /// void h(); 1943 /// }; 1944 /// @endcode 1945 RefQualifierKind getRefQualifier() const { 1946 return getType()->getAs<FunctionProtoType>()->getRefQualifier(); 1947 } 1948 1949 bool hasInlineBody() const; 1950 1951 /// \brief Determine whether this is a lambda closure type's static member 1952 /// function that is used for the result of the lambda's conversion to 1953 /// function pointer (for a lambda with no captures). 1954 /// 1955 /// The function itself, if used, will have a placeholder body that will be 1956 /// supplied by IR generation to either forward to the function call operator 1957 /// or clone the function call operator. 1958 bool isLambdaStaticInvoker() const; 1959 1960 /// \brief Find the method in \p RD that corresponds to this one. 1961 /// 1962 /// Find if \p RD or one of the classes it inherits from override this method. 1963 /// If so, return it. \p RD is assumed to be a subclass of the class defining 1964 /// this method (or be the class itself), unless \p MayBeBase is set to true. 1965 CXXMethodDecl * 1966 getCorrespondingMethodInClass(const CXXRecordDecl *RD, 1967 bool MayBeBase = false); 1968 1969 const CXXMethodDecl * 1970 getCorrespondingMethodInClass(const CXXRecordDecl *RD, 1971 bool MayBeBase = false) const { 1972 return const_cast<CXXMethodDecl *>(this) 1973 ->getCorrespondingMethodInClass(RD, MayBeBase); 1974 } 1975 1976 // Implement isa/cast/dyncast/etc. 1977 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 1978 static bool classofKind(Kind K) { 1979 return K >= firstCXXMethod && K <= lastCXXMethod; 1980 } 1981 }; 1982 1983 /// \brief Represents a C++ base or member initializer. 1984 /// 1985 /// This is part of a constructor initializer that 1986 /// initializes one non-static member variable or one base class. For 1987 /// example, in the following, both 'A(a)' and 'f(3.14159)' are member 1988 /// initializers: 1989 /// 1990 /// \code 1991 /// class A { }; 1992 /// class B : public A { 1993 /// float f; 1994 /// public: 1995 /// B(A& a) : A(a), f(3.14159) { } 1996 /// }; 1997 /// \endcode 1998 class CXXCtorInitializer final { 1999 /// \brief Either the base class name/delegating constructor type (stored as 2000 /// a TypeSourceInfo*), an normal field (FieldDecl), or an anonymous field 2001 /// (IndirectFieldDecl*) being initialized. 2002 llvm::PointerUnion3<TypeSourceInfo *, FieldDecl *, IndirectFieldDecl *> 2003 Initializee; 2004 2005 /// \brief The source location for the field name or, for a base initializer 2006 /// pack expansion, the location of the ellipsis. 2007 /// 2008 /// In the case of a delegating 2009 /// constructor, it will still include the type's source location as the 2010 /// Initializee points to the CXXConstructorDecl (to allow loop detection). 2011 SourceLocation MemberOrEllipsisLocation; 2012 2013 /// \brief The argument used to initialize the base or member, which may 2014 /// end up constructing an object (when multiple arguments are involved). 2015 Stmt *Init; 2016 2017 /// \brief Location of the left paren of the ctor-initializer. 2018 SourceLocation LParenLoc; 2019 2020 /// \brief Location of the right paren of the ctor-initializer. 2021 SourceLocation RParenLoc; 2022 2023 /// \brief If the initializee is a type, whether that type makes this 2024 /// a delegating initialization. 2025 unsigned IsDelegating : 1; 2026 2027 /// \brief If the initializer is a base initializer, this keeps track 2028 /// of whether the base is virtual or not. 2029 unsigned IsVirtual : 1; 2030 2031 /// \brief Whether or not the initializer is explicitly written 2032 /// in the sources. 2033 unsigned IsWritten : 1; 2034 2035 /// If IsWritten is true, then this number keeps track of the textual order 2036 /// of this initializer in the original sources, counting from 0. 2037 unsigned SourceOrder : 13; 2038 2039 public: 2040 /// \brief Creates a new base-class initializer. 2041 explicit 2042 CXXCtorInitializer(ASTContext &Context, TypeSourceInfo *TInfo, bool IsVirtual, 2043 SourceLocation L, Expr *Init, SourceLocation R, 2044 SourceLocation EllipsisLoc); 2045 2046 /// \brief Creates a new member initializer. 2047 explicit 2048 CXXCtorInitializer(ASTContext &Context, FieldDecl *Member, 2049 SourceLocation MemberLoc, SourceLocation L, Expr *Init, 2050 SourceLocation R); 2051 2052 /// \brief Creates a new anonymous field initializer. 2053 explicit 2054 CXXCtorInitializer(ASTContext &Context, IndirectFieldDecl *Member, 2055 SourceLocation MemberLoc, SourceLocation L, Expr *Init, 2056 SourceLocation R); 2057 2058 /// \brief Creates a new delegating initializer. 2059 explicit 2060 CXXCtorInitializer(ASTContext &Context, TypeSourceInfo *TInfo, 2061 SourceLocation L, Expr *Init, SourceLocation R); 2062 2063 /// \brief Determine whether this initializer is initializing a base class. 2064 bool isBaseInitializer() const { 2065 return Initializee.is<TypeSourceInfo*>() && !IsDelegating; 2066 } 2067 2068 /// \brief Determine whether this initializer is initializing a non-static 2069 /// data member. 2070 bool isMemberInitializer() const { return Initializee.is<FieldDecl*>(); } 2071 2072 bool isAnyMemberInitializer() const { 2073 return isMemberInitializer() || isIndirectMemberInitializer(); 2074 } 2075 2076 bool isIndirectMemberInitializer() const { 2077 return Initializee.is<IndirectFieldDecl*>(); 2078 } 2079 2080 /// \brief Determine whether this initializer is an implicit initializer 2081 /// generated for a field with an initializer defined on the member 2082 /// declaration. 2083 /// 2084 /// In-class member initializers (also known as "non-static data member 2085 /// initializations", NSDMIs) were introduced in C++11. 2086 bool isInClassMemberInitializer() const { 2087 return Init->getStmtClass() == Stmt::CXXDefaultInitExprClass; 2088 } 2089 2090 /// \brief Determine whether this initializer is creating a delegating 2091 /// constructor. 2092 bool isDelegatingInitializer() const { 2093 return Initializee.is<TypeSourceInfo*>() && IsDelegating; 2094 } 2095 2096 /// \brief Determine whether this initializer is a pack expansion. 2097 bool isPackExpansion() const { 2098 return isBaseInitializer() && MemberOrEllipsisLocation.isValid(); 2099 } 2100 2101 // \brief For a pack expansion, returns the location of the ellipsis. 2102 SourceLocation getEllipsisLoc() const { 2103 assert(isPackExpansion() && "Initializer is not a pack expansion"); 2104 return MemberOrEllipsisLocation; 2105 } 2106 2107 /// If this is a base class initializer, returns the type of the 2108 /// base class with location information. Otherwise, returns an NULL 2109 /// type location. 2110 TypeLoc getBaseClassLoc() const; 2111 2112 /// If this is a base class initializer, returns the type of the base class. 2113 /// Otherwise, returns null. 2114 const Type *getBaseClass() const; 2115 2116 /// Returns whether the base is virtual or not. 2117 bool isBaseVirtual() const { 2118 assert(isBaseInitializer() && "Must call this on base initializer!"); 2119 2120 return IsVirtual; 2121 } 2122 2123 /// \brief Returns the declarator information for a base class or delegating 2124 /// initializer. 2125 TypeSourceInfo *getTypeSourceInfo() const { 2126 return Initializee.dyn_cast<TypeSourceInfo *>(); 2127 } 2128 2129 /// \brief If this is a member initializer, returns the declaration of the 2130 /// non-static data member being initialized. Otherwise, returns null. 2131 FieldDecl *getMember() const { 2132 if (isMemberInitializer()) 2133 return Initializee.get<FieldDecl*>(); 2134 return nullptr; 2135 } 2136 FieldDecl *getAnyMember() const { 2137 if (isMemberInitializer()) 2138 return Initializee.get<FieldDecl*>(); 2139 if (isIndirectMemberInitializer()) 2140 return Initializee.get<IndirectFieldDecl*>()->getAnonField(); 2141 return nullptr; 2142 } 2143 2144 IndirectFieldDecl *getIndirectMember() const { 2145 if (isIndirectMemberInitializer()) 2146 return Initializee.get<IndirectFieldDecl*>(); 2147 return nullptr; 2148 } 2149 2150 SourceLocation getMemberLocation() const { 2151 return MemberOrEllipsisLocation; 2152 } 2153 2154 /// \brief Determine the source location of the initializer. 2155 SourceLocation getSourceLocation() const; 2156 2157 /// \brief Determine the source range covering the entire initializer. 2158 SourceRange getSourceRange() const LLVM_READONLY; 2159 2160 /// \brief Determine whether this initializer is explicitly written 2161 /// in the source code. 2162 bool isWritten() const { return IsWritten; } 2163 2164 /// \brief Return the source position of the initializer, counting from 0. 2165 /// If the initializer was implicit, -1 is returned. 2166 int getSourceOrder() const { 2167 return IsWritten ? static_cast<int>(SourceOrder) : -1; 2168 } 2169 2170 /// \brief Set the source order of this initializer. 2171 /// 2172 /// This can only be called once for each initializer; it cannot be called 2173 /// on an initializer having a positive number of (implicit) array indices. 2174 /// 2175 /// This assumes that the initializer was written in the source code, and 2176 /// ensures that isWritten() returns true. 2177 void setSourceOrder(int Pos) { 2178 assert(!IsWritten && 2179 "setSourceOrder() used on implicit initializer"); 2180 assert(SourceOrder == 0 && 2181 "calling twice setSourceOrder() on the same initializer"); 2182 assert(Pos >= 0 && 2183 "setSourceOrder() used to make an initializer implicit"); 2184 IsWritten = true; 2185 SourceOrder = static_cast<unsigned>(Pos); 2186 } 2187 2188 SourceLocation getLParenLoc() const { return LParenLoc; } 2189 SourceLocation getRParenLoc() const { return RParenLoc; } 2190 2191 /// \brief Get the initializer. 2192 Expr *getInit() const { return static_cast<Expr*>(Init); } 2193 }; 2194 2195 /// Description of a constructor that was inherited from a base class. 2196 class InheritedConstructor { 2197 ConstructorUsingShadowDecl *Shadow; 2198 CXXConstructorDecl *BaseCtor; 2199 2200 public: 2201 InheritedConstructor() : Shadow(), BaseCtor() {} 2202 InheritedConstructor(ConstructorUsingShadowDecl *Shadow, 2203 CXXConstructorDecl *BaseCtor) 2204 : Shadow(Shadow), BaseCtor(BaseCtor) {} 2205 2206 explicit operator bool() const { return Shadow; } 2207 2208 ConstructorUsingShadowDecl *getShadowDecl() const { return Shadow; } 2209 CXXConstructorDecl *getConstructor() const { return BaseCtor; } 2210 }; 2211 2212 /// \brief Represents a C++ constructor within a class. 2213 /// 2214 /// For example: 2215 /// 2216 /// \code 2217 /// class X { 2218 /// public: 2219 /// explicit X(int); // represented by a CXXConstructorDecl. 2220 /// }; 2221 /// \endcode 2222 class CXXConstructorDecl final 2223 : public CXXMethodDecl, 2224 private llvm::TrailingObjects<CXXConstructorDecl, InheritedConstructor> { 2225 void anchor() override; 2226 2227 /// \name Support for base and member initializers. 2228 /// \{ 2229 /// \brief The arguments used to initialize the base or member. 2230 LazyCXXCtorInitializersPtr CtorInitializers; 2231 unsigned NumCtorInitializers : 31; 2232 /// \} 2233 2234 /// \brief Whether this constructor declaration is an implicitly-declared 2235 /// inheriting constructor. 2236 unsigned IsInheritingConstructor : 1; 2237 2238 CXXConstructorDecl(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2239 const DeclarationNameInfo &NameInfo, 2240 QualType T, TypeSourceInfo *TInfo, 2241 bool isExplicitSpecified, bool isInline, 2242 bool isImplicitlyDeclared, bool isConstexpr, 2243 InheritedConstructor Inherited) 2244 : CXXMethodDecl(CXXConstructor, C, RD, StartLoc, NameInfo, T, TInfo, 2245 SC_None, isInline, isConstexpr, SourceLocation()), 2246 CtorInitializers(nullptr), NumCtorInitializers(0), 2247 IsInheritingConstructor((bool)Inherited) { 2248 setImplicit(isImplicitlyDeclared); 2249 if (Inherited) 2250 *getTrailingObjects<InheritedConstructor>() = Inherited; 2251 IsExplicitSpecified = isExplicitSpecified; 2252 } 2253 2254 public: 2255 static CXXConstructorDecl *CreateDeserialized(ASTContext &C, unsigned ID, 2256 bool InheritsConstructor); 2257 static CXXConstructorDecl * 2258 Create(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2259 const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo, 2260 bool isExplicit, bool isInline, bool isImplicitlyDeclared, 2261 bool isConstexpr, 2262 InheritedConstructor Inherited = InheritedConstructor()); 2263 2264 /// \brief Iterates through the member/base initializer list. 2265 typedef CXXCtorInitializer **init_iterator; 2266 2267 /// \brief Iterates through the member/base initializer list. 2268 typedef CXXCtorInitializer *const *init_const_iterator; 2269 2270 typedef llvm::iterator_range<init_iterator> init_range; 2271 typedef llvm::iterator_range<init_const_iterator> init_const_range; 2272 2273 init_range inits() { return init_range(init_begin(), init_end()); } 2274 init_const_range inits() const { 2275 return init_const_range(init_begin(), init_end()); 2276 } 2277 2278 /// \brief Retrieve an iterator to the first initializer. 2279 init_iterator init_begin() { 2280 const auto *ConstThis = this; 2281 return const_cast<init_iterator>(ConstThis->init_begin()); 2282 } 2283 /// \brief Retrieve an iterator to the first initializer. 2284 init_const_iterator init_begin() const; 2285 2286 /// \brief Retrieve an iterator past the last initializer. 2287 init_iterator init_end() { 2288 return init_begin() + NumCtorInitializers; 2289 } 2290 /// \brief Retrieve an iterator past the last initializer. 2291 init_const_iterator init_end() const { 2292 return init_begin() + NumCtorInitializers; 2293 } 2294 2295 typedef std::reverse_iterator<init_iterator> init_reverse_iterator; 2296 typedef std::reverse_iterator<init_const_iterator> 2297 init_const_reverse_iterator; 2298 2299 init_reverse_iterator init_rbegin() { 2300 return init_reverse_iterator(init_end()); 2301 } 2302 init_const_reverse_iterator init_rbegin() const { 2303 return init_const_reverse_iterator(init_end()); 2304 } 2305 2306 init_reverse_iterator init_rend() { 2307 return init_reverse_iterator(init_begin()); 2308 } 2309 init_const_reverse_iterator init_rend() const { 2310 return init_const_reverse_iterator(init_begin()); 2311 } 2312 2313 /// \brief Determine the number of arguments used to initialize the member 2314 /// or base. 2315 unsigned getNumCtorInitializers() const { 2316 return NumCtorInitializers; 2317 } 2318 2319 void setNumCtorInitializers(unsigned numCtorInitializers) { 2320 NumCtorInitializers = numCtorInitializers; 2321 } 2322 2323 void setCtorInitializers(CXXCtorInitializer **Initializers) { 2324 CtorInitializers = Initializers; 2325 } 2326 2327 /// Whether this function is marked as explicit explicitly. 2328 bool isExplicitSpecified() const { return IsExplicitSpecified; } 2329 2330 /// Whether this function is explicit. 2331 bool isExplicit() const { 2332 return getCanonicalDecl()->isExplicitSpecified(); 2333 } 2334 2335 /// \brief Determine whether this constructor is a delegating constructor. 2336 bool isDelegatingConstructor() const { 2337 return (getNumCtorInitializers() == 1) && 2338 init_begin()[0]->isDelegatingInitializer(); 2339 } 2340 2341 /// \brief When this constructor delegates to another, retrieve the target. 2342 CXXConstructorDecl *getTargetConstructor() const; 2343 2344 /// Whether this constructor is a default 2345 /// constructor (C++ [class.ctor]p5), which can be used to 2346 /// default-initialize a class of this type. 2347 bool isDefaultConstructor() const; 2348 2349 /// \brief Whether this constructor is a copy constructor (C++ [class.copy]p2, 2350 /// which can be used to copy the class. 2351 /// 2352 /// \p TypeQuals will be set to the qualifiers on the 2353 /// argument type. For example, \p TypeQuals would be set to \c 2354 /// Qualifiers::Const for the following copy constructor: 2355 /// 2356 /// \code 2357 /// class X { 2358 /// public: 2359 /// X(const X&); 2360 /// }; 2361 /// \endcode 2362 bool isCopyConstructor(unsigned &TypeQuals) const; 2363 2364 /// Whether this constructor is a copy 2365 /// constructor (C++ [class.copy]p2, which can be used to copy the 2366 /// class. 2367 bool isCopyConstructor() const { 2368 unsigned TypeQuals = 0; 2369 return isCopyConstructor(TypeQuals); 2370 } 2371 2372 /// \brief Determine whether this constructor is a move constructor 2373 /// (C++11 [class.copy]p3), which can be used to move values of the class. 2374 /// 2375 /// \param TypeQuals If this constructor is a move constructor, will be set 2376 /// to the type qualifiers on the referent of the first parameter's type. 2377 bool isMoveConstructor(unsigned &TypeQuals) const; 2378 2379 /// \brief Determine whether this constructor is a move constructor 2380 /// (C++11 [class.copy]p3), which can be used to move values of the class. 2381 bool isMoveConstructor() const { 2382 unsigned TypeQuals = 0; 2383 return isMoveConstructor(TypeQuals); 2384 } 2385 2386 /// \brief Determine whether this is a copy or move constructor. 2387 /// 2388 /// \param TypeQuals Will be set to the type qualifiers on the reference 2389 /// parameter, if in fact this is a copy or move constructor. 2390 bool isCopyOrMoveConstructor(unsigned &TypeQuals) const; 2391 2392 /// \brief Determine whether this a copy or move constructor. 2393 bool isCopyOrMoveConstructor() const { 2394 unsigned Quals; 2395 return isCopyOrMoveConstructor(Quals); 2396 } 2397 2398 /// Whether this constructor is a 2399 /// converting constructor (C++ [class.conv.ctor]), which can be 2400 /// used for user-defined conversions. 2401 bool isConvertingConstructor(bool AllowExplicit) const; 2402 2403 /// \brief Determine whether this is a member template specialization that 2404 /// would copy the object to itself. Such constructors are never used to copy 2405 /// an object. 2406 bool isSpecializationCopyingObject() const; 2407 2408 /// \brief Determine whether this is an implicit constructor synthesized to 2409 /// model a call to a constructor inherited from a base class. 2410 bool isInheritingConstructor() const { return IsInheritingConstructor; } 2411 2412 /// \brief Get the constructor that this inheriting constructor is based on. 2413 InheritedConstructor getInheritedConstructor() const { 2414 return IsInheritingConstructor ? *getTrailingObjects<InheritedConstructor>() 2415 : InheritedConstructor(); 2416 } 2417 2418 CXXConstructorDecl *getCanonicalDecl() override { 2419 return cast<CXXConstructorDecl>(FunctionDecl::getCanonicalDecl()); 2420 } 2421 const CXXConstructorDecl *getCanonicalDecl() const { 2422 return const_cast<CXXConstructorDecl*>(this)->getCanonicalDecl(); 2423 } 2424 2425 // Implement isa/cast/dyncast/etc. 2426 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2427 static bool classofKind(Kind K) { return K == CXXConstructor; } 2428 2429 friend class ASTDeclReader; 2430 friend class ASTDeclWriter; 2431 friend TrailingObjects; 2432 }; 2433 2434 /// \brief Represents a C++ destructor within a class. 2435 /// 2436 /// For example: 2437 /// 2438 /// \code 2439 /// class X { 2440 /// public: 2441 /// ~X(); // represented by a CXXDestructorDecl. 2442 /// }; 2443 /// \endcode 2444 class CXXDestructorDecl : public CXXMethodDecl { 2445 void anchor() override; 2446 2447 FunctionDecl *OperatorDelete; 2448 2449 CXXDestructorDecl(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2450 const DeclarationNameInfo &NameInfo, 2451 QualType T, TypeSourceInfo *TInfo, 2452 bool isInline, bool isImplicitlyDeclared) 2453 : CXXMethodDecl(CXXDestructor, C, RD, StartLoc, NameInfo, T, TInfo, 2454 SC_None, isInline, /*isConstexpr=*/false, SourceLocation()), 2455 OperatorDelete(nullptr) { 2456 setImplicit(isImplicitlyDeclared); 2457 } 2458 2459 public: 2460 static CXXDestructorDecl *Create(ASTContext &C, CXXRecordDecl *RD, 2461 SourceLocation StartLoc, 2462 const DeclarationNameInfo &NameInfo, 2463 QualType T, TypeSourceInfo* TInfo, 2464 bool isInline, 2465 bool isImplicitlyDeclared); 2466 static CXXDestructorDecl *CreateDeserialized(ASTContext & C, unsigned ID); 2467 2468 void setOperatorDelete(FunctionDecl *OD); 2469 const FunctionDecl *getOperatorDelete() const { 2470 return getCanonicalDecl()->OperatorDelete; 2471 } 2472 2473 CXXDestructorDecl *getCanonicalDecl() override { 2474 return cast<CXXDestructorDecl>(FunctionDecl::getCanonicalDecl()); 2475 } 2476 const CXXDestructorDecl *getCanonicalDecl() const { 2477 return const_cast<CXXDestructorDecl*>(this)->getCanonicalDecl(); 2478 } 2479 2480 // Implement isa/cast/dyncast/etc. 2481 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2482 static bool classofKind(Kind K) { return K == CXXDestructor; } 2483 2484 friend class ASTDeclReader; 2485 friend class ASTDeclWriter; 2486 }; 2487 2488 /// \brief Represents a C++ conversion function within a class. 2489 /// 2490 /// For example: 2491 /// 2492 /// \code 2493 /// class X { 2494 /// public: 2495 /// operator bool(); 2496 /// }; 2497 /// \endcode 2498 class CXXConversionDecl : public CXXMethodDecl { 2499 void anchor() override; 2500 2501 CXXConversionDecl(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2502 const DeclarationNameInfo &NameInfo, QualType T, 2503 TypeSourceInfo *TInfo, bool isInline, 2504 bool isExplicitSpecified, bool isConstexpr, 2505 SourceLocation EndLocation) 2506 : CXXMethodDecl(CXXConversion, C, RD, StartLoc, NameInfo, T, TInfo, 2507 SC_None, isInline, isConstexpr, EndLocation) { 2508 IsExplicitSpecified = isExplicitSpecified; 2509 } 2510 2511 public: 2512 static CXXConversionDecl *Create(ASTContext &C, CXXRecordDecl *RD, 2513 SourceLocation StartLoc, 2514 const DeclarationNameInfo &NameInfo, 2515 QualType T, TypeSourceInfo *TInfo, 2516 bool isInline, bool isExplicit, 2517 bool isConstexpr, 2518 SourceLocation EndLocation); 2519 static CXXConversionDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2520 2521 /// Whether this function is marked as explicit explicitly. 2522 bool isExplicitSpecified() const { return IsExplicitSpecified; } 2523 2524 /// Whether this function is explicit. 2525 bool isExplicit() const { 2526 return getCanonicalDecl()->isExplicitSpecified(); 2527 } 2528 2529 /// \brief Returns the type that this conversion function is converting to. 2530 QualType getConversionType() const { 2531 return getType()->getAs<FunctionType>()->getReturnType(); 2532 } 2533 2534 /// \brief Determine whether this conversion function is a conversion from 2535 /// a lambda closure type to a block pointer. 2536 bool isLambdaToBlockPointerConversion() const; 2537 2538 CXXConversionDecl *getCanonicalDecl() override { 2539 return cast<CXXConversionDecl>(FunctionDecl::getCanonicalDecl()); 2540 } 2541 const CXXConversionDecl *getCanonicalDecl() const { 2542 return const_cast<CXXConversionDecl*>(this)->getCanonicalDecl(); 2543 } 2544 2545 // Implement isa/cast/dyncast/etc. 2546 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2547 static bool classofKind(Kind K) { return K == CXXConversion; } 2548 2549 friend class ASTDeclReader; 2550 friend class ASTDeclWriter; 2551 }; 2552 2553 /// \brief Represents a linkage specification. 2554 /// 2555 /// For example: 2556 /// \code 2557 /// extern "C" void foo(); 2558 /// \endcode 2559 class LinkageSpecDecl : public Decl, public DeclContext { 2560 virtual void anchor(); 2561 public: 2562 /// \brief Represents the language in a linkage specification. 2563 /// 2564 /// The values are part of the serialization ABI for 2565 /// ASTs and cannot be changed without altering that ABI. To help 2566 /// ensure a stable ABI for this, we choose the DW_LANG_ encodings 2567 /// from the dwarf standard. 2568 enum LanguageIDs { 2569 lang_c = /* DW_LANG_C */ 0x0002, 2570 lang_cxx = /* DW_LANG_C_plus_plus */ 0x0004 2571 }; 2572 private: 2573 /// \brief The language for this linkage specification. 2574 unsigned Language : 3; 2575 /// \brief True if this linkage spec has braces. 2576 /// 2577 /// This is needed so that hasBraces() returns the correct result while the 2578 /// linkage spec body is being parsed. Once RBraceLoc has been set this is 2579 /// not used, so it doesn't need to be serialized. 2580 unsigned HasBraces : 1; 2581 /// \brief The source location for the extern keyword. 2582 SourceLocation ExternLoc; 2583 /// \brief The source location for the right brace (if valid). 2584 SourceLocation RBraceLoc; 2585 2586 LinkageSpecDecl(DeclContext *DC, SourceLocation ExternLoc, 2587 SourceLocation LangLoc, LanguageIDs lang, bool HasBraces) 2588 : Decl(LinkageSpec, DC, LangLoc), DeclContext(LinkageSpec), 2589 Language(lang), HasBraces(HasBraces), ExternLoc(ExternLoc), 2590 RBraceLoc(SourceLocation()) { } 2591 2592 public: 2593 static LinkageSpecDecl *Create(ASTContext &C, DeclContext *DC, 2594 SourceLocation ExternLoc, 2595 SourceLocation LangLoc, LanguageIDs Lang, 2596 bool HasBraces); 2597 static LinkageSpecDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2598 2599 /// \brief Return the language specified by this linkage specification. 2600 LanguageIDs getLanguage() const { return LanguageIDs(Language); } 2601 /// \brief Set the language specified by this linkage specification. 2602 void setLanguage(LanguageIDs L) { Language = L; } 2603 2604 /// \brief Determines whether this linkage specification had braces in 2605 /// its syntactic form. 2606 bool hasBraces() const { 2607 assert(!RBraceLoc.isValid() || HasBraces); 2608 return HasBraces; 2609 } 2610 2611 SourceLocation getExternLoc() const { return ExternLoc; } 2612 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2613 void setExternLoc(SourceLocation L) { ExternLoc = L; } 2614 void setRBraceLoc(SourceLocation L) { 2615 RBraceLoc = L; 2616 HasBraces = RBraceLoc.isValid(); 2617 } 2618 2619 SourceLocation getLocEnd() const LLVM_READONLY { 2620 if (hasBraces()) 2621 return getRBraceLoc(); 2622 // No braces: get the end location of the (only) declaration in context 2623 // (if present). 2624 return decls_empty() ? getLocation() : decls_begin()->getLocEnd(); 2625 } 2626 2627 SourceRange getSourceRange() const override LLVM_READONLY { 2628 return SourceRange(ExternLoc, getLocEnd()); 2629 } 2630 2631 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2632 static bool classofKind(Kind K) { return K == LinkageSpec; } 2633 static DeclContext *castToDeclContext(const LinkageSpecDecl *D) { 2634 return static_cast<DeclContext *>(const_cast<LinkageSpecDecl*>(D)); 2635 } 2636 static LinkageSpecDecl *castFromDeclContext(const DeclContext *DC) { 2637 return static_cast<LinkageSpecDecl *>(const_cast<DeclContext*>(DC)); 2638 } 2639 }; 2640 2641 /// \brief Represents C++ using-directive. 2642 /// 2643 /// For example: 2644 /// \code 2645 /// using namespace std; 2646 /// \endcode 2647 /// 2648 /// \note UsingDirectiveDecl should be Decl not NamedDecl, but we provide 2649 /// artificial names for all using-directives in order to store 2650 /// them in DeclContext effectively. 2651 class UsingDirectiveDecl : public NamedDecl { 2652 void anchor() override; 2653 /// \brief The location of the \c using keyword. 2654 SourceLocation UsingLoc; 2655 2656 /// \brief The location of the \c namespace keyword. 2657 SourceLocation NamespaceLoc; 2658 2659 /// \brief The nested-name-specifier that precedes the namespace. 2660 NestedNameSpecifierLoc QualifierLoc; 2661 2662 /// \brief The namespace nominated by this using-directive. 2663 NamedDecl *NominatedNamespace; 2664 2665 /// Enclosing context containing both using-directive and nominated 2666 /// namespace. 2667 DeclContext *CommonAncestor; 2668 2669 /// \brief Returns special DeclarationName used by using-directives. 2670 /// 2671 /// This is only used by DeclContext for storing UsingDirectiveDecls in 2672 /// its lookup structure. 2673 static DeclarationName getName() { 2674 return DeclarationName::getUsingDirectiveName(); 2675 } 2676 2677 UsingDirectiveDecl(DeclContext *DC, SourceLocation UsingLoc, 2678 SourceLocation NamespcLoc, 2679 NestedNameSpecifierLoc QualifierLoc, 2680 SourceLocation IdentLoc, 2681 NamedDecl *Nominated, 2682 DeclContext *CommonAncestor) 2683 : NamedDecl(UsingDirective, DC, IdentLoc, getName()), UsingLoc(UsingLoc), 2684 NamespaceLoc(NamespcLoc), QualifierLoc(QualifierLoc), 2685 NominatedNamespace(Nominated), CommonAncestor(CommonAncestor) { } 2686 2687 public: 2688 /// \brief Retrieve the nested-name-specifier that qualifies the 2689 /// name of the namespace, with source-location information. 2690 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 2691 2692 /// \brief Retrieve the nested-name-specifier that qualifies the 2693 /// name of the namespace. 2694 NestedNameSpecifier *getQualifier() const { 2695 return QualifierLoc.getNestedNameSpecifier(); 2696 } 2697 2698 NamedDecl *getNominatedNamespaceAsWritten() { return NominatedNamespace; } 2699 const NamedDecl *getNominatedNamespaceAsWritten() const { 2700 return NominatedNamespace; 2701 } 2702 2703 /// \brief Returns the namespace nominated by this using-directive. 2704 NamespaceDecl *getNominatedNamespace(); 2705 2706 const NamespaceDecl *getNominatedNamespace() const { 2707 return const_cast<UsingDirectiveDecl*>(this)->getNominatedNamespace(); 2708 } 2709 2710 /// \brief Returns the common ancestor context of this using-directive and 2711 /// its nominated namespace. 2712 DeclContext *getCommonAncestor() { return CommonAncestor; } 2713 const DeclContext *getCommonAncestor() const { return CommonAncestor; } 2714 2715 /// \brief Return the location of the \c using keyword. 2716 SourceLocation getUsingLoc() const { return UsingLoc; } 2717 2718 // FIXME: Could omit 'Key' in name. 2719 /// \brief Returns the location of the \c namespace keyword. 2720 SourceLocation getNamespaceKeyLocation() const { return NamespaceLoc; } 2721 2722 /// \brief Returns the location of this using declaration's identifier. 2723 SourceLocation getIdentLocation() const { return getLocation(); } 2724 2725 static UsingDirectiveDecl *Create(ASTContext &C, DeclContext *DC, 2726 SourceLocation UsingLoc, 2727 SourceLocation NamespaceLoc, 2728 NestedNameSpecifierLoc QualifierLoc, 2729 SourceLocation IdentLoc, 2730 NamedDecl *Nominated, 2731 DeclContext *CommonAncestor); 2732 static UsingDirectiveDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2733 2734 SourceRange getSourceRange() const override LLVM_READONLY { 2735 return SourceRange(UsingLoc, getLocation()); 2736 } 2737 2738 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2739 static bool classofKind(Kind K) { return K == UsingDirective; } 2740 2741 // Friend for getUsingDirectiveName. 2742 friend class DeclContext; 2743 2744 friend class ASTDeclReader; 2745 }; 2746 2747 /// \brief Represents a C++ namespace alias. 2748 /// 2749 /// For example: 2750 /// 2751 /// \code 2752 /// namespace Foo = Bar; 2753 /// \endcode 2754 class NamespaceAliasDecl : public NamedDecl, 2755 public Redeclarable<NamespaceAliasDecl> { 2756 void anchor() override; 2757 2758 /// \brief The location of the \c namespace keyword. 2759 SourceLocation NamespaceLoc; 2760 2761 /// \brief The location of the namespace's identifier. 2762 /// 2763 /// This is accessed by TargetNameLoc. 2764 SourceLocation IdentLoc; 2765 2766 /// \brief The nested-name-specifier that precedes the namespace. 2767 NestedNameSpecifierLoc QualifierLoc; 2768 2769 /// \brief The Decl that this alias points to, either a NamespaceDecl or 2770 /// a NamespaceAliasDecl. 2771 NamedDecl *Namespace; 2772 2773 NamespaceAliasDecl(ASTContext &C, DeclContext *DC, 2774 SourceLocation NamespaceLoc, SourceLocation AliasLoc, 2775 IdentifierInfo *Alias, NestedNameSpecifierLoc QualifierLoc, 2776 SourceLocation IdentLoc, NamedDecl *Namespace) 2777 : NamedDecl(NamespaceAlias, DC, AliasLoc, Alias), redeclarable_base(C), 2778 NamespaceLoc(NamespaceLoc), IdentLoc(IdentLoc), 2779 QualifierLoc(QualifierLoc), Namespace(Namespace) {} 2780 2781 typedef Redeclarable<NamespaceAliasDecl> redeclarable_base; 2782 NamespaceAliasDecl *getNextRedeclarationImpl() override; 2783 NamespaceAliasDecl *getPreviousDeclImpl() override; 2784 NamespaceAliasDecl *getMostRecentDeclImpl() override; 2785 2786 friend class ASTDeclReader; 2787 2788 public: 2789 static NamespaceAliasDecl *Create(ASTContext &C, DeclContext *DC, 2790 SourceLocation NamespaceLoc, 2791 SourceLocation AliasLoc, 2792 IdentifierInfo *Alias, 2793 NestedNameSpecifierLoc QualifierLoc, 2794 SourceLocation IdentLoc, 2795 NamedDecl *Namespace); 2796 2797 static NamespaceAliasDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2798 2799 typedef redeclarable_base::redecl_range redecl_range; 2800 typedef redeclarable_base::redecl_iterator redecl_iterator; 2801 using redeclarable_base::redecls_begin; 2802 using redeclarable_base::redecls_end; 2803 using redeclarable_base::redecls; 2804 using redeclarable_base::getPreviousDecl; 2805 using redeclarable_base::getMostRecentDecl; 2806 2807 NamespaceAliasDecl *getCanonicalDecl() override { 2808 return getFirstDecl(); 2809 } 2810 const NamespaceAliasDecl *getCanonicalDecl() const { 2811 return getFirstDecl(); 2812 } 2813 2814 /// \brief Retrieve the nested-name-specifier that qualifies the 2815 /// name of the namespace, with source-location information. 2816 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 2817 2818 /// \brief Retrieve the nested-name-specifier that qualifies the 2819 /// name of the namespace. 2820 NestedNameSpecifier *getQualifier() const { 2821 return QualifierLoc.getNestedNameSpecifier(); 2822 } 2823 2824 /// \brief Retrieve the namespace declaration aliased by this directive. 2825 NamespaceDecl *getNamespace() { 2826 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(Namespace)) 2827 return AD->getNamespace(); 2828 2829 return cast<NamespaceDecl>(Namespace); 2830 } 2831 2832 const NamespaceDecl *getNamespace() const { 2833 return const_cast<NamespaceAliasDecl*>(this)->getNamespace(); 2834 } 2835 2836 /// Returns the location of the alias name, i.e. 'foo' in 2837 /// "namespace foo = ns::bar;". 2838 SourceLocation getAliasLoc() const { return getLocation(); } 2839 2840 /// Returns the location of the \c namespace keyword. 2841 SourceLocation getNamespaceLoc() const { return NamespaceLoc; } 2842 2843 /// Returns the location of the identifier in the named namespace. 2844 SourceLocation getTargetNameLoc() const { return IdentLoc; } 2845 2846 /// \brief Retrieve the namespace that this alias refers to, which 2847 /// may either be a NamespaceDecl or a NamespaceAliasDecl. 2848 NamedDecl *getAliasedNamespace() const { return Namespace; } 2849 2850 SourceRange getSourceRange() const override LLVM_READONLY { 2851 return SourceRange(NamespaceLoc, IdentLoc); 2852 } 2853 2854 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2855 static bool classofKind(Kind K) { return K == NamespaceAlias; } 2856 }; 2857 2858 /// \brief Represents a shadow declaration introduced into a scope by a 2859 /// (resolved) using declaration. 2860 /// 2861 /// For example, 2862 /// \code 2863 /// namespace A { 2864 /// void foo(); 2865 /// } 2866 /// namespace B { 2867 /// using A::foo; // <- a UsingDecl 2868 /// // Also creates a UsingShadowDecl for A::foo() in B 2869 /// } 2870 /// \endcode 2871 class UsingShadowDecl : public NamedDecl, public Redeclarable<UsingShadowDecl> { 2872 void anchor() override; 2873 2874 /// The referenced declaration. 2875 NamedDecl *Underlying; 2876 2877 /// \brief The using declaration which introduced this decl or the next using 2878 /// shadow declaration contained in the aforementioned using declaration. 2879 NamedDecl *UsingOrNextShadow; 2880 friend class UsingDecl; 2881 2882 typedef Redeclarable<UsingShadowDecl> redeclarable_base; 2883 UsingShadowDecl *getNextRedeclarationImpl() override { 2884 return getNextRedeclaration(); 2885 } 2886 UsingShadowDecl *getPreviousDeclImpl() override { 2887 return getPreviousDecl(); 2888 } 2889 UsingShadowDecl *getMostRecentDeclImpl() override { 2890 return getMostRecentDecl(); 2891 } 2892 2893 protected: 2894 UsingShadowDecl(Kind K, ASTContext &C, DeclContext *DC, SourceLocation Loc, 2895 UsingDecl *Using, NamedDecl *Target); 2896 UsingShadowDecl(Kind K, ASTContext &C, EmptyShell); 2897 2898 public: 2899 static UsingShadowDecl *Create(ASTContext &C, DeclContext *DC, 2900 SourceLocation Loc, UsingDecl *Using, 2901 NamedDecl *Target) { 2902 return new (C, DC) UsingShadowDecl(UsingShadow, C, DC, Loc, Using, Target); 2903 } 2904 2905 static UsingShadowDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2906 2907 typedef redeclarable_base::redecl_range redecl_range; 2908 typedef redeclarable_base::redecl_iterator redecl_iterator; 2909 using redeclarable_base::redecls_begin; 2910 using redeclarable_base::redecls_end; 2911 using redeclarable_base::redecls; 2912 using redeclarable_base::getPreviousDecl; 2913 using redeclarable_base::getMostRecentDecl; 2914 using redeclarable_base::isFirstDecl; 2915 2916 UsingShadowDecl *getCanonicalDecl() override { 2917 return getFirstDecl(); 2918 } 2919 const UsingShadowDecl *getCanonicalDecl() const { 2920 return getFirstDecl(); 2921 } 2922 2923 /// \brief Gets the underlying declaration which has been brought into the 2924 /// local scope. 2925 NamedDecl *getTargetDecl() const { return Underlying; } 2926 2927 /// \brief Sets the underlying declaration which has been brought into the 2928 /// local scope. 2929 void setTargetDecl(NamedDecl* ND) { 2930 assert(ND && "Target decl is null!"); 2931 Underlying = ND; 2932 IdentifierNamespace = ND->getIdentifierNamespace(); 2933 } 2934 2935 /// \brief Gets the using declaration to which this declaration is tied. 2936 UsingDecl *getUsingDecl() const; 2937 2938 /// \brief The next using shadow declaration contained in the shadow decl 2939 /// chain of the using declaration which introduced this decl. 2940 UsingShadowDecl *getNextUsingShadowDecl() const { 2941 return dyn_cast_or_null<UsingShadowDecl>(UsingOrNextShadow); 2942 } 2943 2944 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2945 static bool classofKind(Kind K) { 2946 return K == Decl::UsingShadow || K == Decl::ConstructorUsingShadow; 2947 } 2948 2949 friend class ASTDeclReader; 2950 friend class ASTDeclWriter; 2951 }; 2952 2953 /// \brief Represents a shadow constructor declaration introduced into a 2954 /// class by a C++11 using-declaration that names a constructor. 2955 /// 2956 /// For example: 2957 /// \code 2958 /// struct Base { Base(int); }; 2959 /// struct Derived { 2960 /// using Base::Base; // creates a UsingDecl and a ConstructorUsingShadowDecl 2961 /// }; 2962 /// \endcode 2963 class ConstructorUsingShadowDecl final : public UsingShadowDecl { 2964 void anchor() override; 2965 2966 /// \brief If this constructor using declaration inherted the constructor 2967 /// from an indirect base class, this is the ConstructorUsingShadowDecl 2968 /// in the named direct base class from which the declaration was inherited. 2969 ConstructorUsingShadowDecl *NominatedBaseClassShadowDecl; 2970 2971 /// \brief If this constructor using declaration inherted the constructor 2972 /// from an indirect base class, this is the ConstructorUsingShadowDecl 2973 /// that will be used to construct the unique direct or virtual base class 2974 /// that receives the constructor arguments. 2975 ConstructorUsingShadowDecl *ConstructedBaseClassShadowDecl; 2976 2977 /// \brief \c true if the constructor ultimately named by this using shadow 2978 /// declaration is within a virtual base class subobject of the class that 2979 /// contains this declaration. 2980 unsigned IsVirtual : 1; 2981 2982 ConstructorUsingShadowDecl(ASTContext &C, DeclContext *DC, SourceLocation Loc, 2983 UsingDecl *Using, NamedDecl *Target, 2984 bool TargetInVirtualBase) 2985 : UsingShadowDecl(ConstructorUsingShadow, C, DC, Loc, Using, 2986 Target->getUnderlyingDecl()), 2987 NominatedBaseClassShadowDecl( 2988 dyn_cast<ConstructorUsingShadowDecl>(Target)), 2989 ConstructedBaseClassShadowDecl(NominatedBaseClassShadowDecl), 2990 IsVirtual(TargetInVirtualBase) { 2991 // If we found a constructor that chains to a constructor for a virtual 2992 // base, we should directly call that virtual base constructor instead. 2993 // FIXME: This logic belongs in Sema. 2994 if (NominatedBaseClassShadowDecl && 2995 NominatedBaseClassShadowDecl->constructsVirtualBase()) { 2996 ConstructedBaseClassShadowDecl = 2997 NominatedBaseClassShadowDecl->ConstructedBaseClassShadowDecl; 2998 IsVirtual = true; 2999 } 3000 } 3001 ConstructorUsingShadowDecl(ASTContext &C, EmptyShell Empty) 3002 : UsingShadowDecl(ConstructorUsingShadow, C, Empty), 3003 NominatedBaseClassShadowDecl(), ConstructedBaseClassShadowDecl(), 3004 IsVirtual(false) {} 3005 3006 public: 3007 static ConstructorUsingShadowDecl *Create(ASTContext &C, DeclContext *DC, 3008 SourceLocation Loc, 3009 UsingDecl *Using, NamedDecl *Target, 3010 bool IsVirtual); 3011 static ConstructorUsingShadowDecl *CreateDeserialized(ASTContext &C, 3012 unsigned ID); 3013 3014 /// Returns the parent of this using shadow declaration, which 3015 /// is the class in which this is declared. 3016 //@{ 3017 const CXXRecordDecl *getParent() const { 3018 return cast<CXXRecordDecl>(getDeclContext()); 3019 } 3020 CXXRecordDecl *getParent() { 3021 return cast<CXXRecordDecl>(getDeclContext()); 3022 } 3023 //@} 3024 3025 /// \brief Get the inheriting constructor declaration for the direct base 3026 /// class from which this using shadow declaration was inherited, if there is 3027 /// one. This can be different for each redeclaration of the same shadow decl. 3028 ConstructorUsingShadowDecl *getNominatedBaseClassShadowDecl() const { 3029 return NominatedBaseClassShadowDecl; 3030 } 3031 3032 /// \brief Get the inheriting constructor declaration for the base class 3033 /// for which we don't have an explicit initializer, if there is one. 3034 ConstructorUsingShadowDecl *getConstructedBaseClassShadowDecl() const { 3035 return ConstructedBaseClassShadowDecl; 3036 } 3037 3038 /// \brief Get the base class that was named in the using declaration. This 3039 /// can be different for each redeclaration of this same shadow decl. 3040 CXXRecordDecl *getNominatedBaseClass() const; 3041 3042 /// \brief Get the base class whose constructor or constructor shadow 3043 /// declaration is passed the constructor arguments. 3044 CXXRecordDecl *getConstructedBaseClass() const { 3045 return cast<CXXRecordDecl>((ConstructedBaseClassShadowDecl 3046 ? ConstructedBaseClassShadowDecl 3047 : getTargetDecl()) 3048 ->getDeclContext()); 3049 } 3050 3051 /// \brief Returns \c true if the constructed base class is a virtual base 3052 /// class subobject of this declaration's class. 3053 bool constructsVirtualBase() const { 3054 return IsVirtual; 3055 } 3056 3057 /// \brief Get the constructor or constructor template in the derived class 3058 /// correspnding to this using shadow declaration, if it has been implicitly 3059 /// declared already. 3060 CXXConstructorDecl *getConstructor() const; 3061 void setConstructor(NamedDecl *Ctor); 3062 3063 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3064 static bool classofKind(Kind K) { return K == ConstructorUsingShadow; } 3065 3066 friend class ASTDeclReader; 3067 friend class ASTDeclWriter; 3068 }; 3069 3070 /// \brief Represents a C++ using-declaration. 3071 /// 3072 /// For example: 3073 /// \code 3074 /// using someNameSpace::someIdentifier; 3075 /// \endcode 3076 class UsingDecl : public NamedDecl, public Mergeable<UsingDecl> { 3077 void anchor() override; 3078 3079 /// \brief The source location of the 'using' keyword itself. 3080 SourceLocation UsingLocation; 3081 3082 /// \brief The nested-name-specifier that precedes the name. 3083 NestedNameSpecifierLoc QualifierLoc; 3084 3085 /// \brief Provides source/type location info for the declaration name 3086 /// embedded in the ValueDecl base class. 3087 DeclarationNameLoc DNLoc; 3088 3089 /// \brief The first shadow declaration of the shadow decl chain associated 3090 /// with this using declaration. 3091 /// 3092 /// The bool member of the pair store whether this decl has the \c typename 3093 /// keyword. 3094 llvm::PointerIntPair<UsingShadowDecl *, 1, bool> FirstUsingShadow; 3095 3096 UsingDecl(DeclContext *DC, SourceLocation UL, 3097 NestedNameSpecifierLoc QualifierLoc, 3098 const DeclarationNameInfo &NameInfo, bool HasTypenameKeyword) 3099 : NamedDecl(Using, DC, NameInfo.getLoc(), NameInfo.getName()), 3100 UsingLocation(UL), QualifierLoc(QualifierLoc), 3101 DNLoc(NameInfo.getInfo()), FirstUsingShadow(nullptr, HasTypenameKeyword) { 3102 } 3103 3104 public: 3105 /// \brief Return the source location of the 'using' keyword. 3106 SourceLocation getUsingLoc() const { return UsingLocation; } 3107 3108 /// \brief Set the source location of the 'using' keyword. 3109 void setUsingLoc(SourceLocation L) { UsingLocation = L; } 3110 3111 /// \brief Retrieve the nested-name-specifier that qualifies the name, 3112 /// with source-location information. 3113 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3114 3115 /// \brief Retrieve the nested-name-specifier that qualifies the name. 3116 NestedNameSpecifier *getQualifier() const { 3117 return QualifierLoc.getNestedNameSpecifier(); 3118 } 3119 3120 DeclarationNameInfo getNameInfo() const { 3121 return DeclarationNameInfo(getDeclName(), getLocation(), DNLoc); 3122 } 3123 3124 /// \brief Return true if it is a C++03 access declaration (no 'using'). 3125 bool isAccessDeclaration() const { return UsingLocation.isInvalid(); } 3126 3127 /// \brief Return true if the using declaration has 'typename'. 3128 bool hasTypename() const { return FirstUsingShadow.getInt(); } 3129 3130 /// \brief Sets whether the using declaration has 'typename'. 3131 void setTypename(bool TN) { FirstUsingShadow.setInt(TN); } 3132 3133 /// \brief Iterates through the using shadow declarations associated with 3134 /// this using declaration. 3135 class shadow_iterator { 3136 /// \brief The current using shadow declaration. 3137 UsingShadowDecl *Current; 3138 3139 public: 3140 typedef UsingShadowDecl* value_type; 3141 typedef UsingShadowDecl* reference; 3142 typedef UsingShadowDecl* pointer; 3143 typedef std::forward_iterator_tag iterator_category; 3144 typedef std::ptrdiff_t difference_type; 3145 3146 shadow_iterator() : Current(nullptr) { } 3147 explicit shadow_iterator(UsingShadowDecl *C) : Current(C) { } 3148 3149 reference operator*() const { return Current; } 3150 pointer operator->() const { return Current; } 3151 3152 shadow_iterator& operator++() { 3153 Current = Current->getNextUsingShadowDecl(); 3154 return *this; 3155 } 3156 3157 shadow_iterator operator++(int) { 3158 shadow_iterator tmp(*this); 3159 ++(*this); 3160 return tmp; 3161 } 3162 3163 friend bool operator==(shadow_iterator x, shadow_iterator y) { 3164 return x.Current == y.Current; 3165 } 3166 friend bool operator!=(shadow_iterator x, shadow_iterator y) { 3167 return x.Current != y.Current; 3168 } 3169 }; 3170 3171 typedef llvm::iterator_range<shadow_iterator> shadow_range; 3172 3173 shadow_range shadows() const { 3174 return shadow_range(shadow_begin(), shadow_end()); 3175 } 3176 shadow_iterator shadow_begin() const { 3177 return shadow_iterator(FirstUsingShadow.getPointer()); 3178 } 3179 shadow_iterator shadow_end() const { return shadow_iterator(); } 3180 3181 /// \brief Return the number of shadowed declarations associated with this 3182 /// using declaration. 3183 unsigned shadow_size() const { 3184 return std::distance(shadow_begin(), shadow_end()); 3185 } 3186 3187 void addShadowDecl(UsingShadowDecl *S); 3188 void removeShadowDecl(UsingShadowDecl *S); 3189 3190 static UsingDecl *Create(ASTContext &C, DeclContext *DC, 3191 SourceLocation UsingL, 3192 NestedNameSpecifierLoc QualifierLoc, 3193 const DeclarationNameInfo &NameInfo, 3194 bool HasTypenameKeyword); 3195 3196 static UsingDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3197 3198 SourceRange getSourceRange() const override LLVM_READONLY; 3199 3200 /// Retrieves the canonical declaration of this declaration. 3201 UsingDecl *getCanonicalDecl() override { return getFirstDecl(); } 3202 const UsingDecl *getCanonicalDecl() const { return getFirstDecl(); } 3203 3204 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3205 static bool classofKind(Kind K) { return K == Using; } 3206 3207 friend class ASTDeclReader; 3208 friend class ASTDeclWriter; 3209 }; 3210 3211 /// Represents a pack of using declarations that a single 3212 /// using-declarator pack-expanded into. 3213 /// 3214 /// \code 3215 /// template<typename ...T> struct X : T... { 3216 /// using T::operator()...; 3217 /// using T::operator T...; 3218 /// }; 3219 /// \endcode 3220 /// 3221 /// In the second case above, the UsingPackDecl will have the name 3222 /// 'operator T' (which contains an unexpanded pack), but the individual 3223 /// UsingDecls and UsingShadowDecls will have more reasonable names. 3224 class UsingPackDecl final 3225 : public NamedDecl, public Mergeable<UsingPackDecl>, 3226 private llvm::TrailingObjects<UsingPackDecl, NamedDecl *> { 3227 void anchor() override; 3228 3229 /// The UnresolvedUsingValueDecl or UnresolvedUsingTypenameDecl from 3230 /// which this waas instantiated. 3231 NamedDecl *InstantiatedFrom; 3232 3233 /// The number of using-declarations created by this pack expansion. 3234 unsigned NumExpansions; 3235 3236 UsingPackDecl(DeclContext *DC, NamedDecl *InstantiatedFrom, 3237 ArrayRef<NamedDecl *> UsingDecls) 3238 : NamedDecl(UsingPack, DC, 3239 InstantiatedFrom ? InstantiatedFrom->getLocation() 3240 : SourceLocation(), 3241 InstantiatedFrom ? InstantiatedFrom->getDeclName() 3242 : DeclarationName()), 3243 InstantiatedFrom(InstantiatedFrom), NumExpansions(UsingDecls.size()) { 3244 std::uninitialized_copy(UsingDecls.begin(), UsingDecls.end(), 3245 getTrailingObjects<NamedDecl *>()); 3246 } 3247 3248 public: 3249 /// Get the using declaration from which this was instantiated. This will 3250 /// always be an UnresolvedUsingValueDecl or an UnresolvedUsingTypenameDecl 3251 /// that is a pack expansion. 3252 NamedDecl *getInstantiatedFromUsingDecl() const { return InstantiatedFrom; } 3253 3254 /// Get the set of using declarations that this pack expanded into. Note that 3255 /// some of these may still be unresolved. 3256 ArrayRef<NamedDecl *> expansions() const { 3257 return llvm::makeArrayRef(getTrailingObjects<NamedDecl *>(), NumExpansions); 3258 } 3259 3260 static UsingPackDecl *Create(ASTContext &C, DeclContext *DC, 3261 NamedDecl *InstantiatedFrom, 3262 ArrayRef<NamedDecl *> UsingDecls); 3263 3264 static UsingPackDecl *CreateDeserialized(ASTContext &C, unsigned ID, 3265 unsigned NumExpansions); 3266 3267 SourceRange getSourceRange() const override LLVM_READONLY { 3268 return InstantiatedFrom->getSourceRange(); 3269 } 3270 3271 UsingPackDecl *getCanonicalDecl() override { return getFirstDecl(); } 3272 const UsingPackDecl *getCanonicalDecl() const { return getFirstDecl(); } 3273 3274 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3275 static bool classofKind(Kind K) { return K == UsingPack; } 3276 3277 friend class ASTDeclReader; 3278 friend class ASTDeclWriter; 3279 friend TrailingObjects; 3280 }; 3281 3282 /// \brief Represents a dependent using declaration which was not marked with 3283 /// \c typename. 3284 /// 3285 /// Unlike non-dependent using declarations, these *only* bring through 3286 /// non-types; otherwise they would break two-phase lookup. 3287 /// 3288 /// \code 3289 /// template \<class T> class A : public Base<T> { 3290 /// using Base<T>::foo; 3291 /// }; 3292 /// \endcode 3293 class UnresolvedUsingValueDecl : public ValueDecl, 3294 public Mergeable<UnresolvedUsingValueDecl> { 3295 void anchor() override; 3296 3297 /// \brief The source location of the 'using' keyword 3298 SourceLocation UsingLocation; 3299 3300 /// \brief If this is a pack expansion, the location of the '...'. 3301 SourceLocation EllipsisLoc; 3302 3303 /// \brief The nested-name-specifier that precedes the name. 3304 NestedNameSpecifierLoc QualifierLoc; 3305 3306 /// \brief Provides source/type location info for the declaration name 3307 /// embedded in the ValueDecl base class. 3308 DeclarationNameLoc DNLoc; 3309 3310 UnresolvedUsingValueDecl(DeclContext *DC, QualType Ty, 3311 SourceLocation UsingLoc, 3312 NestedNameSpecifierLoc QualifierLoc, 3313 const DeclarationNameInfo &NameInfo, 3314 SourceLocation EllipsisLoc) 3315 : ValueDecl(UnresolvedUsingValue, DC, 3316 NameInfo.getLoc(), NameInfo.getName(), Ty), 3317 UsingLocation(UsingLoc), EllipsisLoc(EllipsisLoc), 3318 QualifierLoc(QualifierLoc), DNLoc(NameInfo.getInfo()) 3319 { } 3320 3321 public: 3322 /// \brief Returns the source location of the 'using' keyword. 3323 SourceLocation getUsingLoc() const { return UsingLocation; } 3324 3325 /// \brief Set the source location of the 'using' keyword. 3326 void setUsingLoc(SourceLocation L) { UsingLocation = L; } 3327 3328 /// \brief Return true if it is a C++03 access declaration (no 'using'). 3329 bool isAccessDeclaration() const { return UsingLocation.isInvalid(); } 3330 3331 /// \brief Retrieve the nested-name-specifier that qualifies the name, 3332 /// with source-location information. 3333 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3334 3335 /// \brief Retrieve the nested-name-specifier that qualifies the name. 3336 NestedNameSpecifier *getQualifier() const { 3337 return QualifierLoc.getNestedNameSpecifier(); 3338 } 3339 3340 DeclarationNameInfo getNameInfo() const { 3341 return DeclarationNameInfo(getDeclName(), getLocation(), DNLoc); 3342 } 3343 3344 /// \brief Determine whether this is a pack expansion. 3345 bool isPackExpansion() const { 3346 return EllipsisLoc.isValid(); 3347 } 3348 3349 /// \brief Get the location of the ellipsis if this is a pack expansion. 3350 SourceLocation getEllipsisLoc() const { 3351 return EllipsisLoc; 3352 } 3353 3354 static UnresolvedUsingValueDecl * 3355 Create(ASTContext &C, DeclContext *DC, SourceLocation UsingLoc, 3356 NestedNameSpecifierLoc QualifierLoc, 3357 const DeclarationNameInfo &NameInfo, SourceLocation EllipsisLoc); 3358 3359 static UnresolvedUsingValueDecl * 3360 CreateDeserialized(ASTContext &C, unsigned ID); 3361 3362 SourceRange getSourceRange() const override LLVM_READONLY; 3363 3364 /// Retrieves the canonical declaration of this declaration. 3365 UnresolvedUsingValueDecl *getCanonicalDecl() override { 3366 return getFirstDecl(); 3367 } 3368 const UnresolvedUsingValueDecl *getCanonicalDecl() const { 3369 return getFirstDecl(); 3370 } 3371 3372 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3373 static bool classofKind(Kind K) { return K == UnresolvedUsingValue; } 3374 3375 friend class ASTDeclReader; 3376 friend class ASTDeclWriter; 3377 }; 3378 3379 /// \brief Represents a dependent using declaration which was marked with 3380 /// \c typename. 3381 /// 3382 /// \code 3383 /// template \<class T> class A : public Base<T> { 3384 /// using typename Base<T>::foo; 3385 /// }; 3386 /// \endcode 3387 /// 3388 /// The type associated with an unresolved using typename decl is 3389 /// currently always a typename type. 3390 class UnresolvedUsingTypenameDecl 3391 : public TypeDecl, 3392 public Mergeable<UnresolvedUsingTypenameDecl> { 3393 void anchor() override; 3394 3395 /// \brief The source location of the 'typename' keyword 3396 SourceLocation TypenameLocation; 3397 3398 /// \brief If this is a pack expansion, the location of the '...'. 3399 SourceLocation EllipsisLoc; 3400 3401 /// \brief The nested-name-specifier that precedes the name. 3402 NestedNameSpecifierLoc QualifierLoc; 3403 3404 UnresolvedUsingTypenameDecl(DeclContext *DC, SourceLocation UsingLoc, 3405 SourceLocation TypenameLoc, 3406 NestedNameSpecifierLoc QualifierLoc, 3407 SourceLocation TargetNameLoc, 3408 IdentifierInfo *TargetName, 3409 SourceLocation EllipsisLoc) 3410 : TypeDecl(UnresolvedUsingTypename, DC, TargetNameLoc, TargetName, 3411 UsingLoc), 3412 TypenameLocation(TypenameLoc), EllipsisLoc(EllipsisLoc), 3413 QualifierLoc(QualifierLoc) { } 3414 3415 friend class ASTDeclReader; 3416 3417 public: 3418 /// \brief Returns the source location of the 'using' keyword. 3419 SourceLocation getUsingLoc() const { return getLocStart(); } 3420 3421 /// \brief Returns the source location of the 'typename' keyword. 3422 SourceLocation getTypenameLoc() const { return TypenameLocation; } 3423 3424 /// \brief Retrieve the nested-name-specifier that qualifies the name, 3425 /// with source-location information. 3426 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3427 3428 /// \brief Retrieve the nested-name-specifier that qualifies the name. 3429 NestedNameSpecifier *getQualifier() const { 3430 return QualifierLoc.getNestedNameSpecifier(); 3431 } 3432 3433 DeclarationNameInfo getNameInfo() const { 3434 return DeclarationNameInfo(getDeclName(), getLocation()); 3435 } 3436 3437 /// \brief Determine whether this is a pack expansion. 3438 bool isPackExpansion() const { 3439 return EllipsisLoc.isValid(); 3440 } 3441 3442 /// \brief Get the location of the ellipsis if this is a pack expansion. 3443 SourceLocation getEllipsisLoc() const { 3444 return EllipsisLoc; 3445 } 3446 3447 static UnresolvedUsingTypenameDecl * 3448 Create(ASTContext &C, DeclContext *DC, SourceLocation UsingLoc, 3449 SourceLocation TypenameLoc, NestedNameSpecifierLoc QualifierLoc, 3450 SourceLocation TargetNameLoc, DeclarationName TargetName, 3451 SourceLocation EllipsisLoc); 3452 3453 static UnresolvedUsingTypenameDecl * 3454 CreateDeserialized(ASTContext &C, unsigned ID); 3455 3456 /// Retrieves the canonical declaration of this declaration. 3457 UnresolvedUsingTypenameDecl *getCanonicalDecl() override { 3458 return getFirstDecl(); 3459 } 3460 const UnresolvedUsingTypenameDecl *getCanonicalDecl() const { 3461 return getFirstDecl(); 3462 } 3463 3464 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3465 static bool classofKind(Kind K) { return K == UnresolvedUsingTypename; } 3466 }; 3467 3468 /// \brief Represents a C++11 static_assert declaration. 3469 class StaticAssertDecl : public Decl { 3470 virtual void anchor(); 3471 llvm::PointerIntPair<Expr *, 1, bool> AssertExprAndFailed; 3472 StringLiteral *Message; 3473 SourceLocation RParenLoc; 3474 3475 StaticAssertDecl(DeclContext *DC, SourceLocation StaticAssertLoc, 3476 Expr *AssertExpr, StringLiteral *Message, 3477 SourceLocation RParenLoc, bool Failed) 3478 : Decl(StaticAssert, DC, StaticAssertLoc), 3479 AssertExprAndFailed(AssertExpr, Failed), Message(Message), 3480 RParenLoc(RParenLoc) { } 3481 3482 public: 3483 static StaticAssertDecl *Create(ASTContext &C, DeclContext *DC, 3484 SourceLocation StaticAssertLoc, 3485 Expr *AssertExpr, StringLiteral *Message, 3486 SourceLocation RParenLoc, bool Failed); 3487 static StaticAssertDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3488 3489 Expr *getAssertExpr() { return AssertExprAndFailed.getPointer(); } 3490 const Expr *getAssertExpr() const { return AssertExprAndFailed.getPointer(); } 3491 3492 StringLiteral *getMessage() { return Message; } 3493 const StringLiteral *getMessage() const { return Message; } 3494 3495 bool isFailed() const { return AssertExprAndFailed.getInt(); } 3496 3497 SourceLocation getRParenLoc() const { return RParenLoc; } 3498 3499 SourceRange getSourceRange() const override LLVM_READONLY { 3500 return SourceRange(getLocation(), getRParenLoc()); 3501 } 3502 3503 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3504 static bool classofKind(Kind K) { return K == StaticAssert; } 3505 3506 friend class ASTDeclReader; 3507 }; 3508 3509 /// A binding in a decomposition declaration. For instance, given: 3510 /// 3511 /// int n[3]; 3512 /// auto &[a, b, c] = n; 3513 /// 3514 /// a, b, and c are BindingDecls, whose bindings are the expressions 3515 /// x[0], x[1], and x[2] respectively, where x is the implicit 3516 /// DecompositionDecl of type 'int (&)[3]'. 3517 class BindingDecl : public ValueDecl { 3518 void anchor() override; 3519 3520 /// The binding represented by this declaration. References to this 3521 /// declaration are effectively equivalent to this expression (except 3522 /// that it is only evaluated once at the point of declaration of the 3523 /// binding). 3524 Expr *Binding; 3525 3526 BindingDecl(DeclContext *DC, SourceLocation IdLoc, IdentifierInfo *Id) 3527 : ValueDecl(Decl::Binding, DC, IdLoc, Id, QualType()), Binding(nullptr) {} 3528 3529 public: 3530 static BindingDecl *Create(ASTContext &C, DeclContext *DC, 3531 SourceLocation IdLoc, IdentifierInfo *Id); 3532 static BindingDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3533 3534 /// Get the expression to which this declaration is bound. This may be null 3535 /// in two different cases: while parsing the initializer for the 3536 /// decomposition declaration, and when the initializer is type-dependent. 3537 Expr *getBinding() const { return Binding; } 3538 3539 /// Get the variable (if any) that holds the value of evaluating the binding. 3540 /// Only present for user-defined bindings for tuple-like types. 3541 VarDecl *getHoldingVar() const; 3542 3543 /// Set the binding for this BindingDecl, along with its declared type (which 3544 /// should be a possibly-cv-qualified form of the type of the binding, or a 3545 /// reference to such a type). 3546 void setBinding(QualType DeclaredType, Expr *Binding) { 3547 setType(DeclaredType); 3548 this->Binding = Binding; 3549 } 3550 3551 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3552 static bool classofKind(Kind K) { return K == Decl::Binding; } 3553 3554 friend class ASTDeclReader; 3555 }; 3556 3557 /// A decomposition declaration. For instance, given: 3558 /// 3559 /// int n[3]; 3560 /// auto &[a, b, c] = n; 3561 /// 3562 /// the second line declares a DecompositionDecl of type 'int (&)[3]', and 3563 /// three BindingDecls (named a, b, and c). An instance of this class is always 3564 /// unnamed, but behaves in almost all other respects like a VarDecl. 3565 class DecompositionDecl final 3566 : public VarDecl, 3567 private llvm::TrailingObjects<DecompositionDecl, BindingDecl *> { 3568 void anchor() override; 3569 3570 /// The number of BindingDecl*s following this object. 3571 unsigned NumBindings; 3572 3573 DecompositionDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, 3574 SourceLocation LSquareLoc, QualType T, 3575 TypeSourceInfo *TInfo, StorageClass SC, 3576 ArrayRef<BindingDecl *> Bindings) 3577 : VarDecl(Decomposition, C, DC, StartLoc, LSquareLoc, nullptr, T, TInfo, 3578 SC), 3579 NumBindings(Bindings.size()) { 3580 std::uninitialized_copy(Bindings.begin(), Bindings.end(), 3581 getTrailingObjects<BindingDecl *>()); 3582 } 3583 3584 public: 3585 static DecompositionDecl *Create(ASTContext &C, DeclContext *DC, 3586 SourceLocation StartLoc, 3587 SourceLocation LSquareLoc, 3588 QualType T, TypeSourceInfo *TInfo, 3589 StorageClass S, 3590 ArrayRef<BindingDecl *> Bindings); 3591 static DecompositionDecl *CreateDeserialized(ASTContext &C, unsigned ID, 3592 unsigned NumBindings); 3593 3594 ArrayRef<BindingDecl *> bindings() const { 3595 return llvm::makeArrayRef(getTrailingObjects<BindingDecl *>(), NumBindings); 3596 } 3597 3598 void printName(raw_ostream &os) const override; 3599 3600 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3601 static bool classofKind(Kind K) { return K == Decomposition; } 3602 3603 friend TrailingObjects; 3604 friend class ASTDeclReader; 3605 }; 3606 3607 /// An instance of this class represents the declaration of a property 3608 /// member. This is a Microsoft extension to C++, first introduced in 3609 /// Visual Studio .NET 2003 as a parallel to similar features in C# 3610 /// and Managed C++. 3611 /// 3612 /// A property must always be a non-static class member. 3613 /// 3614 /// A property member superficially resembles a non-static data 3615 /// member, except preceded by a property attribute: 3616 /// __declspec(property(get=GetX, put=PutX)) int x; 3617 /// Either (but not both) of the 'get' and 'put' names may be omitted. 3618 /// 3619 /// A reference to a property is always an lvalue. If the lvalue 3620 /// undergoes lvalue-to-rvalue conversion, then a getter name is 3621 /// required, and that member is called with no arguments. 3622 /// If the lvalue is assigned into, then a setter name is required, 3623 /// and that member is called with one argument, the value assigned. 3624 /// Both operations are potentially overloaded. Compound assignments 3625 /// are permitted, as are the increment and decrement operators. 3626 /// 3627 /// The getter and putter methods are permitted to be overloaded, 3628 /// although their return and parameter types are subject to certain 3629 /// restrictions according to the type of the property. 3630 /// 3631 /// A property declared using an incomplete array type may 3632 /// additionally be subscripted, adding extra parameters to the getter 3633 /// and putter methods. 3634 class MSPropertyDecl : public DeclaratorDecl { 3635 IdentifierInfo *GetterId, *SetterId; 3636 3637 MSPropertyDecl(DeclContext *DC, SourceLocation L, DeclarationName N, 3638 QualType T, TypeSourceInfo *TInfo, SourceLocation StartL, 3639 IdentifierInfo *Getter, IdentifierInfo *Setter) 3640 : DeclaratorDecl(MSProperty, DC, L, N, T, TInfo, StartL), 3641 GetterId(Getter), SetterId(Setter) {} 3642 3643 public: 3644 static MSPropertyDecl *Create(ASTContext &C, DeclContext *DC, 3645 SourceLocation L, DeclarationName N, QualType T, 3646 TypeSourceInfo *TInfo, SourceLocation StartL, 3647 IdentifierInfo *Getter, IdentifierInfo *Setter); 3648 static MSPropertyDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3649 3650 static bool classof(const Decl *D) { return D->getKind() == MSProperty; } 3651 3652 bool hasGetter() const { return GetterId != nullptr; } 3653 IdentifierInfo* getGetterId() const { return GetterId; } 3654 bool hasSetter() const { return SetterId != nullptr; } 3655 IdentifierInfo* getSetterId() const { return SetterId; } 3656 3657 friend class ASTDeclReader; 3658 }; 3659 3660 /// Insertion operator for diagnostics. This allows sending an AccessSpecifier 3661 /// into a diagnostic with <<. 3662 const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB, 3663 AccessSpecifier AS); 3664 3665 const PartialDiagnostic &operator<<(const PartialDiagnostic &DB, 3666 AccessSpecifier AS); 3667 3668 } // end namespace clang 3669 3670 #endif 3671