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 struct PointerLikeTypeTraits< ::clang::AnyFunctionDecl> { 77 static inline void *getAsVoidPointer(::clang::AnyFunctionDecl F) { 78 return F.get(); 79 } 80 static inline ::clang::AnyFunctionDecl getFromVoidPointer(void *P) { 81 return ::clang::AnyFunctionDecl::getFromNamedDecl( 82 static_cast< ::clang::NamedDecl*>(P)); 83 } 84 85 enum { NumLowBitsAvailable = 2 }; 86 }; 87 88 } // end namespace llvm 89 90 namespace clang { 91 92 /// \brief Represents an access specifier followed by colon ':'. 93 /// 94 /// An objects of this class represents sugar for the syntactic occurrence 95 /// of an access specifier followed by a colon in the list of member 96 /// specifiers of a C++ class definition. 97 /// 98 /// Note that they do not represent other uses of access specifiers, 99 /// such as those occurring in a list of base specifiers. 100 /// Also note that this class has nothing to do with so-called 101 /// "access declarations" (C++98 11.3 [class.access.dcl]). 102 class AccessSpecDecl : public Decl { 103 virtual void anchor(); 104 /// \brief The location of the ':'. 105 SourceLocation ColonLoc; 106 107 AccessSpecDecl(AccessSpecifier AS, DeclContext *DC, 108 SourceLocation ASLoc, SourceLocation ColonLoc) 109 : Decl(AccessSpec, DC, ASLoc), ColonLoc(ColonLoc) { 110 setAccess(AS); 111 } 112 AccessSpecDecl(EmptyShell Empty) 113 : Decl(AccessSpec, Empty) { } 114 public: 115 /// \brief The location of the access specifier. 116 SourceLocation getAccessSpecifierLoc() const { return getLocation(); } 117 /// \brief Sets the location of the access specifier. 118 void setAccessSpecifierLoc(SourceLocation ASLoc) { setLocation(ASLoc); } 119 120 /// \brief The location of the colon following the access specifier. 121 SourceLocation getColonLoc() const { return ColonLoc; } 122 /// \brief Sets the location of the colon. 123 void setColonLoc(SourceLocation CLoc) { ColonLoc = CLoc; } 124 125 SourceRange getSourceRange() const override LLVM_READONLY { 126 return SourceRange(getAccessSpecifierLoc(), getColonLoc()); 127 } 128 129 static AccessSpecDecl *Create(ASTContext &C, AccessSpecifier AS, 130 DeclContext *DC, SourceLocation ASLoc, 131 SourceLocation ColonLoc) { 132 return new (C, DC) AccessSpecDecl(AS, DC, ASLoc, ColonLoc); 133 } 134 static AccessSpecDecl *CreateDeserialized(ASTContext &C, unsigned ID); 135 136 // Implement isa/cast/dyncast/etc. 137 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 138 static bool classofKind(Kind K) { return K == AccessSpec; } 139 }; 140 141 /// \brief Represents a base class of a C++ class. 142 /// 143 /// Each CXXBaseSpecifier represents a single, direct base class (or 144 /// struct) of a C++ class (or struct). It specifies the type of that 145 /// base class, whether it is a virtual or non-virtual base, and what 146 /// level of access (public, protected, private) is used for the 147 /// derivation. For example: 148 /// 149 /// \code 150 /// class A { }; 151 /// class B { }; 152 /// class C : public virtual A, protected B { }; 153 /// \endcode 154 /// 155 /// In this code, C will have two CXXBaseSpecifiers, one for "public 156 /// virtual A" and the other for "protected B". 157 class CXXBaseSpecifier { 158 /// \brief The source code range that covers the full base 159 /// specifier, including the "virtual" (if present) and access 160 /// specifier (if present). 161 SourceRange Range; 162 163 /// \brief The source location of the ellipsis, if this is a pack 164 /// expansion. 165 SourceLocation EllipsisLoc; 166 167 /// \brief Whether this is a virtual base class or not. 168 unsigned Virtual : 1; 169 170 /// \brief Whether this is the base of a class (true) or of a struct (false). 171 /// 172 /// This determines the mapping from the access specifier as written in the 173 /// source code to the access specifier used for semantic analysis. 174 unsigned BaseOfClass : 1; 175 176 /// \brief Access specifier as written in the source code (may be AS_none). 177 /// 178 /// The actual type of data stored here is an AccessSpecifier, but we use 179 /// "unsigned" here to work around a VC++ bug. 180 unsigned Access : 2; 181 182 /// \brief Whether the class contains a using declaration 183 /// to inherit the named class's constructors. 184 unsigned InheritConstructors : 1; 185 186 /// \brief The type of the base class. 187 /// 188 /// This will be a class or struct (or a typedef of such). The source code 189 /// range does not include the \c virtual or the access specifier. 190 TypeSourceInfo *BaseTypeInfo; 191 192 public: 193 CXXBaseSpecifier() { } 194 195 CXXBaseSpecifier(SourceRange R, bool V, bool BC, AccessSpecifier A, 196 TypeSourceInfo *TInfo, SourceLocation EllipsisLoc) 197 : Range(R), EllipsisLoc(EllipsisLoc), Virtual(V), BaseOfClass(BC), 198 Access(A), InheritConstructors(false), BaseTypeInfo(TInfo) { } 199 200 /// \brief Retrieves the source range that contains the entire base specifier. 201 SourceRange getSourceRange() const LLVM_READONLY { return Range; } 202 SourceLocation getLocStart() const LLVM_READONLY { return Range.getBegin(); } 203 SourceLocation getLocEnd() const LLVM_READONLY { return Range.getEnd(); } 204 205 /// \brief Get the location at which the base class type was written. 206 SourceLocation getBaseTypeLoc() const LLVM_READONLY { 207 return BaseTypeInfo->getTypeLoc().getLocStart(); 208 } 209 210 /// \brief Determines whether the base class is a virtual base class (or not). 211 bool isVirtual() const { return Virtual; } 212 213 /// \brief Determine whether this base class is a base of a class declared 214 /// with the 'class' keyword (vs. one declared with the 'struct' keyword). 215 bool isBaseOfClass() const { return BaseOfClass; } 216 217 /// \brief Determine whether this base specifier is a pack expansion. 218 bool isPackExpansion() const { return EllipsisLoc.isValid(); } 219 220 /// \brief Determine whether this base class's constructors get inherited. 221 bool getInheritConstructors() const { return InheritConstructors; } 222 223 /// \brief Set that this base class's constructors should be inherited. 224 void setInheritConstructors(bool Inherit = true) { 225 InheritConstructors = Inherit; 226 } 227 228 /// \brief For a pack expansion, determine the location of the ellipsis. 229 SourceLocation getEllipsisLoc() const { 230 return EllipsisLoc; 231 } 232 233 /// \brief Returns the access specifier for this base specifier. 234 /// 235 /// This is the actual base specifier as used for semantic analysis, so 236 /// the result can never be AS_none. To retrieve the access specifier as 237 /// written in the source code, use getAccessSpecifierAsWritten(). 238 AccessSpecifier getAccessSpecifier() const { 239 if ((AccessSpecifier)Access == AS_none) 240 return BaseOfClass? AS_private : AS_public; 241 else 242 return (AccessSpecifier)Access; 243 } 244 245 /// \brief Retrieves the access specifier as written in the source code 246 /// (which may mean that no access specifier was explicitly written). 247 /// 248 /// Use getAccessSpecifier() to retrieve the access specifier for use in 249 /// semantic analysis. 250 AccessSpecifier getAccessSpecifierAsWritten() const { 251 return (AccessSpecifier)Access; 252 } 253 254 /// \brief Retrieves the type of the base class. 255 /// 256 /// This type will always be an unqualified class type. 257 QualType getType() const { 258 return BaseTypeInfo->getType().getUnqualifiedType(); 259 } 260 261 /// \brief Retrieves the type and source location of the base class. 262 TypeSourceInfo *getTypeSourceInfo() const { return BaseTypeInfo; } 263 }; 264 265 /// \brief Represents a C++ struct/union/class. 266 class CXXRecordDecl : public RecordDecl { 267 268 friend void TagDecl::startDefinition(); 269 270 /// Values used in DefinitionData fields to represent special members. 271 enum SpecialMemberFlags { 272 SMF_DefaultConstructor = 0x1, 273 SMF_CopyConstructor = 0x2, 274 SMF_MoveConstructor = 0x4, 275 SMF_CopyAssignment = 0x8, 276 SMF_MoveAssignment = 0x10, 277 SMF_Destructor = 0x20, 278 SMF_All = 0x3f 279 }; 280 281 struct DefinitionData { 282 DefinitionData(CXXRecordDecl *D); 283 284 /// \brief True if this class has any user-declared constructors. 285 unsigned UserDeclaredConstructor : 1; 286 287 /// \brief The user-declared special members which this class has. 288 unsigned UserDeclaredSpecialMembers : 6; 289 290 /// \brief True when this class is an aggregate. 291 unsigned Aggregate : 1; 292 293 /// \brief True when this class is a POD-type. 294 unsigned PlainOldData : 1; 295 296 /// true when this class is empty for traits purposes, 297 /// i.e. has no data members other than 0-width bit-fields, has no 298 /// virtual function/base, and doesn't inherit from a non-empty 299 /// class. Doesn't take union-ness into account. 300 unsigned Empty : 1; 301 302 /// \brief True when this class is polymorphic, i.e., has at 303 /// least one virtual member or derives from a polymorphic class. 304 unsigned Polymorphic : 1; 305 306 /// \brief True when this class is abstract, i.e., has at least 307 /// one pure virtual function, (that can come from a base class). 308 unsigned Abstract : 1; 309 310 /// \brief True when this class has standard layout. 311 /// 312 /// C++11 [class]p7. A standard-layout class is a class that: 313 /// * has no non-static data members of type non-standard-layout class (or 314 /// array of such types) or reference, 315 /// * has no virtual functions (10.3) and no virtual base classes (10.1), 316 /// * has the same access control (Clause 11) for all non-static data 317 /// members 318 /// * has no non-standard-layout base classes, 319 /// * either has no non-static data members in the most derived class and at 320 /// most one base class with non-static data members, or has no base 321 /// classes with non-static data members, and 322 /// * has no base classes of the same type as the first non-static data 323 /// member. 324 unsigned IsStandardLayout : 1; 325 326 /// \brief True when there are no non-empty base classes. 327 /// 328 /// This is a helper bit of state used to implement IsStandardLayout more 329 /// efficiently. 330 unsigned HasNoNonEmptyBases : 1; 331 332 /// \brief True when there are private non-static data members. 333 unsigned HasPrivateFields : 1; 334 335 /// \brief True when there are protected non-static data members. 336 unsigned HasProtectedFields : 1; 337 338 /// \brief True when there are private non-static data members. 339 unsigned HasPublicFields : 1; 340 341 /// \brief True if this class (or any subobject) has mutable fields. 342 unsigned HasMutableFields : 1; 343 344 /// \brief True if this class (or any nested anonymous struct or union) 345 /// has variant members. 346 unsigned HasVariantMembers : 1; 347 348 /// \brief True if there no non-field members declared by the user. 349 unsigned HasOnlyCMembers : 1; 350 351 /// \brief True if any field has an in-class initializer, including those 352 /// within anonymous unions or structs. 353 unsigned HasInClassInitializer : 1; 354 355 /// \brief True if any field is of reference type, and does not have an 356 /// in-class initializer. 357 /// 358 /// In this case, value-initialization of this class is illegal in C++98 359 /// even if the class has a trivial default constructor. 360 unsigned HasUninitializedReferenceMember : 1; 361 362 /// \brief True if any non-mutable field whose type doesn't have a user- 363 /// provided default ctor also doesn't have an in-class initializer. 364 unsigned HasUninitializedFields : 1; 365 366 /// \brief True if there are any member using-declarations that inherit 367 /// constructors from a base class. 368 unsigned HasInheritedConstructor : 1; 369 370 /// \brief True if there are any member using-declarations named 371 /// 'operator='. 372 unsigned HasInheritedAssignment : 1; 373 374 /// \brief These flags are \c true if a defaulted corresponding special 375 /// member can't be fully analyzed without performing overload resolution. 376 /// @{ 377 unsigned NeedOverloadResolutionForCopyConstructor : 1; 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 DefaultedCopyConstructorIsDeleted : 1; 387 unsigned DefaultedMoveConstructorIsDeleted : 1; 388 unsigned DefaultedMoveAssignmentIsDeleted : 1; 389 unsigned DefaultedDestructorIsDeleted : 1; 390 /// @} 391 392 /// \brief The trivial special members which this class has, per 393 /// C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25, 394 /// C++11 [class.dtor]p5, or would have if the member were not suppressed. 395 /// 396 /// This excludes any user-declared but not user-provided special members 397 /// which have been declared but not yet defined. 398 unsigned HasTrivialSpecialMembers : 6; 399 400 /// \brief The declared special members of this class which are known to be 401 /// non-trivial. 402 /// 403 /// This excludes any user-declared but not user-provided special members 404 /// which have been declared but not yet defined, and any implicit special 405 /// members which have not yet been declared. 406 unsigned DeclaredNonTrivialSpecialMembers : 6; 407 408 /// \brief True when this class has a destructor with no semantic effect. 409 unsigned HasIrrelevantDestructor : 1; 410 411 /// \brief True when this class has at least one user-declared constexpr 412 /// constructor which is neither the copy nor move constructor. 413 unsigned HasConstexprNonCopyMoveConstructor : 1; 414 415 /// \brief True if this class has a (possibly implicit) defaulted default 416 /// constructor. 417 unsigned HasDefaultedDefaultConstructor : 1; 418 419 /// \brief True if this class can be passed in a non-address-preserving 420 /// fashion (such as in registers) according to the C++ language rules. 421 /// This does not imply anything about how the ABI in use will actually 422 /// pass an object of this class. 423 unsigned CanPassInRegisters : 1; 424 425 /// \brief True if a defaulted default constructor for this class would 426 /// be constexpr. 427 unsigned DefaultedDefaultConstructorIsConstexpr : 1; 428 429 /// \brief True if this class has a constexpr default constructor. 430 /// 431 /// This is true for either a user-declared constexpr default constructor 432 /// or an implicitly declared constexpr default constructor. 433 unsigned HasConstexprDefaultConstructor : 1; 434 435 /// \brief True when this class contains at least one non-static data 436 /// member or base class of non-literal or volatile type. 437 unsigned HasNonLiteralTypeFieldsOrBases : 1; 438 439 /// \brief True when visible conversion functions are already computed 440 /// and are available. 441 unsigned ComputedVisibleConversions : 1; 442 443 /// \brief Whether we have a C++11 user-provided default constructor (not 444 /// explicitly deleted or defaulted). 445 unsigned UserProvidedDefaultConstructor : 1; 446 447 /// \brief The special members which have been declared for this class, 448 /// either by the user or implicitly. 449 unsigned DeclaredSpecialMembers : 6; 450 451 /// \brief Whether an implicit copy constructor could have a const-qualified 452 /// parameter, for initializing virtual bases and for other subobjects. 453 unsigned ImplicitCopyConstructorCanHaveConstParamForVBase : 1; 454 unsigned ImplicitCopyConstructorCanHaveConstParamForNonVBase : 1; 455 456 /// \brief Whether an implicit copy assignment operator would have a 457 /// const-qualified parameter. 458 unsigned ImplicitCopyAssignmentHasConstParam : 1; 459 460 /// \brief Whether any declared copy constructor has a const-qualified 461 /// parameter. 462 unsigned HasDeclaredCopyConstructorWithConstParam : 1; 463 464 /// \brief Whether any declared copy assignment operator has either a 465 /// const-qualified reference parameter or a non-reference parameter. 466 unsigned HasDeclaredCopyAssignmentWithConstParam : 1; 467 468 /// \brief Whether this class describes a C++ lambda. 469 unsigned IsLambda : 1; 470 471 /// \brief Whether we are currently parsing base specifiers. 472 unsigned IsParsingBaseSpecifiers : 1; 473 474 unsigned HasODRHash : 1; 475 476 /// \brief A hash of parts of the class to help in ODR checking. 477 unsigned ODRHash; 478 479 /// \brief The number of base class specifiers in Bases. 480 unsigned NumBases; 481 482 /// \brief The number of virtual base class specifiers in VBases. 483 unsigned NumVBases; 484 485 /// \brief Base classes of this class. 486 /// 487 /// FIXME: This is wasted space for a union. 488 LazyCXXBaseSpecifiersPtr Bases; 489 490 /// \brief direct and indirect virtual base classes of this class. 491 LazyCXXBaseSpecifiersPtr VBases; 492 493 /// \brief The conversion functions of this C++ class (but not its 494 /// inherited conversion functions). 495 /// 496 /// Each of the entries in this overload set is a CXXConversionDecl. 497 LazyASTUnresolvedSet Conversions; 498 499 /// \brief The conversion functions of this C++ class and all those 500 /// inherited conversion functions that are visible in this class. 501 /// 502 /// Each of the entries in this overload set is a CXXConversionDecl or a 503 /// FunctionTemplateDecl. 504 LazyASTUnresolvedSet VisibleConversions; 505 506 /// \brief The declaration which defines this record. 507 CXXRecordDecl *Definition; 508 509 /// \brief The first friend declaration in this class, or null if there 510 /// aren't any. 511 /// 512 /// This is actually currently stored in reverse order. 513 LazyDeclPtr FirstFriend; 514 515 /// \brief Retrieve the set of direct base classes. 516 CXXBaseSpecifier *getBases() const { 517 if (!Bases.isOffset()) 518 return Bases.get(nullptr); 519 return getBasesSlowCase(); 520 } 521 522 /// \brief Retrieve the set of virtual base classes. 523 CXXBaseSpecifier *getVBases() const { 524 if (!VBases.isOffset()) 525 return VBases.get(nullptr); 526 return getVBasesSlowCase(); 527 } 528 529 ArrayRef<CXXBaseSpecifier> bases() const { 530 return llvm::makeArrayRef(getBases(), NumBases); 531 } 532 ArrayRef<CXXBaseSpecifier> vbases() const { 533 return llvm::makeArrayRef(getVBases(), NumVBases); 534 } 535 536 private: 537 CXXBaseSpecifier *getBasesSlowCase() const; 538 CXXBaseSpecifier *getVBasesSlowCase() const; 539 }; 540 541 struct DefinitionData *DefinitionData; 542 543 /// \brief Describes a C++ closure type (generated by a lambda expression). 544 struct LambdaDefinitionData : public DefinitionData { 545 typedef LambdaCapture Capture; 546 547 LambdaDefinitionData(CXXRecordDecl *D, TypeSourceInfo *Info, 548 bool Dependent, bool IsGeneric, 549 LambdaCaptureDefault CaptureDefault) 550 : DefinitionData(D), Dependent(Dependent), IsGenericLambda(IsGeneric), 551 CaptureDefault(CaptureDefault), NumCaptures(0), NumExplicitCaptures(0), 552 ManglingNumber(0), ContextDecl(nullptr), Captures(nullptr), 553 MethodTyInfo(Info) { 554 IsLambda = true; 555 556 // C++1z [expr.prim.lambda]p4: 557 // This class type is not an aggregate type. 558 Aggregate = false; 559 PlainOldData = false; 560 } 561 562 /// \brief Whether this lambda is known to be dependent, even if its 563 /// context isn't dependent. 564 /// 565 /// A lambda with a non-dependent context can be dependent if it occurs 566 /// within the default argument of a function template, because the 567 /// lambda will have been created with the enclosing context as its 568 /// declaration context, rather than function. This is an unfortunate 569 /// artifact of having to parse the default arguments before. 570 unsigned Dependent : 1; 571 572 /// \brief Whether this lambda is a generic lambda. 573 unsigned IsGenericLambda : 1; 574 575 /// \brief The Default Capture. 576 unsigned CaptureDefault : 2; 577 578 /// \brief The number of captures in this lambda is limited 2^NumCaptures. 579 unsigned NumCaptures : 15; 580 581 /// \brief The number of explicit captures in this lambda. 582 unsigned NumExplicitCaptures : 13; 583 584 /// \brief The number used to indicate this lambda expression for name 585 /// mangling in the Itanium C++ ABI. 586 unsigned ManglingNumber; 587 588 /// \brief The declaration that provides context for this lambda, if the 589 /// actual DeclContext does not suffice. This is used for lambdas that 590 /// occur within default arguments of function parameters within the class 591 /// or within a data member initializer. 592 LazyDeclPtr ContextDecl; 593 594 /// \brief The list of captures, both explicit and implicit, for this 595 /// lambda. 596 Capture *Captures; 597 598 /// \brief The type of the call method. 599 TypeSourceInfo *MethodTyInfo; 600 601 }; 602 603 struct DefinitionData *dataPtr() const { 604 // Complete the redecl chain (if necessary). 605 getMostRecentDecl(); 606 return DefinitionData; 607 } 608 609 struct DefinitionData &data() const { 610 auto *DD = dataPtr(); 611 assert(DD && "queried property of class with no definition"); 612 return *DD; 613 } 614 615 struct LambdaDefinitionData &getLambdaData() const { 616 // No update required: a merged definition cannot change any lambda 617 // properties. 618 auto *DD = DefinitionData; 619 assert(DD && DD->IsLambda && "queried lambda property of non-lambda class"); 620 return static_cast<LambdaDefinitionData&>(*DD); 621 } 622 623 /// \brief The template or declaration that this declaration 624 /// describes or was instantiated from, respectively. 625 /// 626 /// For non-templates, this value will be null. For record 627 /// declarations that describe a class template, this will be a 628 /// pointer to a ClassTemplateDecl. For member 629 /// classes of class template specializations, this will be the 630 /// MemberSpecializationInfo referring to the member class that was 631 /// instantiated or specialized. 632 llvm::PointerUnion<ClassTemplateDecl*, MemberSpecializationInfo*> 633 TemplateOrInstantiation; 634 635 friend class DeclContext; 636 friend class LambdaExpr; 637 638 /// \brief Called from setBases and addedMember to notify the class that a 639 /// direct or virtual base class or a member of class type has been added. 640 void addedClassSubobject(CXXRecordDecl *Base); 641 642 /// \brief Notify the class that member has been added. 643 /// 644 /// This routine helps maintain information about the class based on which 645 /// members have been added. It will be invoked by DeclContext::addDecl() 646 /// whenever a member is added to this record. 647 void addedMember(Decl *D); 648 649 void markedVirtualFunctionPure(); 650 friend void FunctionDecl::setPure(bool); 651 652 friend class ASTNodeImporter; 653 654 /// \brief Get the head of our list of friend declarations, possibly 655 /// deserializing the friends from an external AST source. 656 FriendDecl *getFirstFriend() const; 657 658 protected: 659 CXXRecordDecl(Kind K, TagKind TK, const ASTContext &C, DeclContext *DC, 660 SourceLocation StartLoc, SourceLocation IdLoc, 661 IdentifierInfo *Id, CXXRecordDecl *PrevDecl); 662 663 public: 664 /// \brief Iterator that traverses the base classes of a class. 665 typedef CXXBaseSpecifier* base_class_iterator; 666 667 /// \brief Iterator that traverses the base classes of a class. 668 typedef const CXXBaseSpecifier* base_class_const_iterator; 669 670 CXXRecordDecl *getCanonicalDecl() override { 671 return cast<CXXRecordDecl>(RecordDecl::getCanonicalDecl()); 672 } 673 const CXXRecordDecl *getCanonicalDecl() const { 674 return const_cast<CXXRecordDecl*>(this)->getCanonicalDecl(); 675 } 676 677 CXXRecordDecl *getPreviousDecl() { 678 return cast_or_null<CXXRecordDecl>( 679 static_cast<RecordDecl *>(this)->getPreviousDecl()); 680 } 681 const CXXRecordDecl *getPreviousDecl() const { 682 return const_cast<CXXRecordDecl*>(this)->getPreviousDecl(); 683 } 684 685 CXXRecordDecl *getMostRecentDecl() { 686 return cast<CXXRecordDecl>( 687 static_cast<RecordDecl *>(this)->getMostRecentDecl()); 688 } 689 690 const CXXRecordDecl *getMostRecentDecl() const { 691 return const_cast<CXXRecordDecl*>(this)->getMostRecentDecl(); 692 } 693 694 CXXRecordDecl *getDefinition() const { 695 // We only need an update if we don't already know which 696 // declaration is the definition. 697 auto *DD = DefinitionData ? DefinitionData : dataPtr(); 698 return DD ? DD->Definition : nullptr; 699 } 700 701 bool hasDefinition() const { return DefinitionData || dataPtr(); } 702 703 static CXXRecordDecl *Create(const ASTContext &C, TagKind TK, DeclContext *DC, 704 SourceLocation StartLoc, SourceLocation IdLoc, 705 IdentifierInfo *Id, 706 CXXRecordDecl *PrevDecl = nullptr, 707 bool DelayTypeCreation = false); 708 static CXXRecordDecl *CreateLambda(const ASTContext &C, DeclContext *DC, 709 TypeSourceInfo *Info, SourceLocation Loc, 710 bool DependentLambda, bool IsGeneric, 711 LambdaCaptureDefault CaptureDefault); 712 static CXXRecordDecl *CreateDeserialized(const ASTContext &C, unsigned ID); 713 714 bool isDynamicClass() const { 715 return data().Polymorphic || data().NumVBases != 0; 716 } 717 718 void setIsParsingBaseSpecifiers() { data().IsParsingBaseSpecifiers = true; } 719 720 bool isParsingBaseSpecifiers() const { 721 return data().IsParsingBaseSpecifiers; 722 } 723 724 unsigned getODRHash() const; 725 726 /// \brief Sets the base classes of this struct or class. 727 void setBases(CXXBaseSpecifier const * const *Bases, unsigned NumBases); 728 729 /// \brief Retrieves the number of base classes of this class. 730 unsigned getNumBases() const { return data().NumBases; } 731 732 typedef llvm::iterator_range<base_class_iterator> base_class_range; 733 typedef llvm::iterator_range<base_class_const_iterator> 734 base_class_const_range; 735 736 base_class_range bases() { 737 return base_class_range(bases_begin(), bases_end()); 738 } 739 base_class_const_range bases() const { 740 return base_class_const_range(bases_begin(), bases_end()); 741 } 742 743 base_class_iterator bases_begin() { return data().getBases(); } 744 base_class_const_iterator bases_begin() const { return data().getBases(); } 745 base_class_iterator bases_end() { return bases_begin() + data().NumBases; } 746 base_class_const_iterator bases_end() const { 747 return bases_begin() + data().NumBases; 748 } 749 750 /// \brief Retrieves the number of virtual base classes of this class. 751 unsigned getNumVBases() const { return data().NumVBases; } 752 753 base_class_range vbases() { 754 return base_class_range(vbases_begin(), vbases_end()); 755 } 756 base_class_const_range vbases() const { 757 return base_class_const_range(vbases_begin(), vbases_end()); 758 } 759 760 base_class_iterator vbases_begin() { return data().getVBases(); } 761 base_class_const_iterator vbases_begin() const { return data().getVBases(); } 762 base_class_iterator vbases_end() { return vbases_begin() + data().NumVBases; } 763 base_class_const_iterator vbases_end() const { 764 return vbases_begin() + data().NumVBases; 765 } 766 767 /// \brief Determine whether this class has any dependent base classes which 768 /// are not the current instantiation. 769 bool hasAnyDependentBases() const; 770 771 /// Iterator access to method members. The method iterator visits 772 /// all method members of the class, including non-instance methods, 773 /// special methods, etc. 774 typedef specific_decl_iterator<CXXMethodDecl> method_iterator; 775 typedef llvm::iterator_range<specific_decl_iterator<CXXMethodDecl>> 776 method_range; 777 778 method_range methods() const { 779 return method_range(method_begin(), method_end()); 780 } 781 782 /// \brief Method begin iterator. Iterates in the order the methods 783 /// were declared. 784 method_iterator method_begin() const { 785 return method_iterator(decls_begin()); 786 } 787 /// \brief Method past-the-end iterator. 788 method_iterator method_end() const { 789 return method_iterator(decls_end()); 790 } 791 792 /// Iterator access to constructor members. 793 typedef specific_decl_iterator<CXXConstructorDecl> ctor_iterator; 794 typedef llvm::iterator_range<specific_decl_iterator<CXXConstructorDecl>> 795 ctor_range; 796 797 ctor_range ctors() const { return ctor_range(ctor_begin(), ctor_end()); } 798 799 ctor_iterator ctor_begin() const { 800 return ctor_iterator(decls_begin()); 801 } 802 ctor_iterator ctor_end() const { 803 return ctor_iterator(decls_end()); 804 } 805 806 /// An iterator over friend declarations. All of these are defined 807 /// in DeclFriend.h. 808 class friend_iterator; 809 typedef llvm::iterator_range<friend_iterator> friend_range; 810 811 friend_range friends() const; 812 friend_iterator friend_begin() const; 813 friend_iterator friend_end() const; 814 void pushFriendDecl(FriendDecl *FD); 815 816 /// Determines whether this record has any friends. 817 bool hasFriends() const { 818 return data().FirstFriend.isValid(); 819 } 820 821 /// \brief \c true if a defaulted copy constructor for this class would be 822 /// deleted. 823 bool defaultedCopyConstructorIsDeleted() const { 824 assert((!needsOverloadResolutionForCopyConstructor() || 825 (data().DeclaredSpecialMembers & SMF_CopyConstructor)) && 826 "this property has not yet been computed by Sema"); 827 return data().DefaultedCopyConstructorIsDeleted; 828 } 829 830 /// \brief \c true if a defaulted move constructor for this class would be 831 /// deleted. 832 bool defaultedMoveConstructorIsDeleted() const { 833 assert((!needsOverloadResolutionForMoveConstructor() || 834 (data().DeclaredSpecialMembers & SMF_MoveConstructor)) && 835 "this property has not yet been computed by Sema"); 836 return data().DefaultedMoveConstructorIsDeleted; 837 } 838 839 /// \brief \c true if a defaulted destructor for this class would be deleted. 840 bool defaultedDestructorIsDeleted() const { 841 assert((!needsOverloadResolutionForDestructor() || 842 (data().DeclaredSpecialMembers & SMF_Destructor)) && 843 "this property has not yet been computed by Sema"); 844 return data().DefaultedDestructorIsDeleted; 845 } 846 847 /// \brief \c true if we know for sure that this class has a single, 848 /// accessible, unambiguous copy constructor that is not deleted. 849 bool hasSimpleCopyConstructor() const { 850 return !hasUserDeclaredCopyConstructor() && 851 !data().DefaultedCopyConstructorIsDeleted; 852 } 853 854 /// \brief \c true if we know for sure that this class has a single, 855 /// accessible, unambiguous move constructor that is not deleted. 856 bool hasSimpleMoveConstructor() const { 857 return !hasUserDeclaredMoveConstructor() && hasMoveConstructor() && 858 !data().DefaultedMoveConstructorIsDeleted; 859 } 860 861 /// \brief \c true if we know for sure that this class has a single, 862 /// accessible, unambiguous move assignment operator that is not deleted. 863 bool hasSimpleMoveAssignment() const { 864 return !hasUserDeclaredMoveAssignment() && hasMoveAssignment() && 865 !data().DefaultedMoveAssignmentIsDeleted; 866 } 867 868 /// \brief \c true if we know for sure that this class has an accessible 869 /// destructor that is not deleted. 870 bool hasSimpleDestructor() const { 871 return !hasUserDeclaredDestructor() && 872 !data().DefaultedDestructorIsDeleted; 873 } 874 875 /// \brief Determine whether this class has any default constructors. 876 bool hasDefaultConstructor() const { 877 return (data().DeclaredSpecialMembers & SMF_DefaultConstructor) || 878 needsImplicitDefaultConstructor(); 879 } 880 881 /// \brief Determine if we need to declare a default constructor for 882 /// this class. 883 /// 884 /// This value is used for lazy creation of default constructors. 885 bool needsImplicitDefaultConstructor() const { 886 return !data().UserDeclaredConstructor && 887 !(data().DeclaredSpecialMembers & SMF_DefaultConstructor) && 888 // C++14 [expr.prim.lambda]p20: 889 // The closure type associated with a lambda-expression has no 890 // default constructor. 891 !isLambda(); 892 } 893 894 /// \brief Determine whether this class has any user-declared constructors. 895 /// 896 /// When true, a default constructor will not be implicitly declared. 897 bool hasUserDeclaredConstructor() const { 898 return data().UserDeclaredConstructor; 899 } 900 901 /// \brief Whether this class has a user-provided default constructor 902 /// per C++11. 903 bool hasUserProvidedDefaultConstructor() const { 904 return data().UserProvidedDefaultConstructor; 905 } 906 907 /// \brief Determine whether this class has a user-declared copy constructor. 908 /// 909 /// When false, a copy constructor will be implicitly declared. 910 bool hasUserDeclaredCopyConstructor() const { 911 return data().UserDeclaredSpecialMembers & SMF_CopyConstructor; 912 } 913 914 /// \brief Determine whether this class needs an implicit copy 915 /// constructor to be lazily declared. 916 bool needsImplicitCopyConstructor() const { 917 return !(data().DeclaredSpecialMembers & SMF_CopyConstructor); 918 } 919 920 /// \brief Determine whether we need to eagerly declare a defaulted copy 921 /// constructor for this class. 922 bool needsOverloadResolutionForCopyConstructor() const { 923 // C++17 [class.copy.ctor]p6: 924 // If the class definition declares a move constructor or move assignment 925 // operator, the implicitly declared copy constructor is defined as 926 // deleted. 927 // In MSVC mode, sometimes a declared move assignment does not delete an 928 // implicit copy constructor, so defer this choice to Sema. 929 if (data().UserDeclaredSpecialMembers & 930 (SMF_MoveConstructor | SMF_MoveAssignment)) 931 return true; 932 return data().NeedOverloadResolutionForCopyConstructor; 933 } 934 935 /// \brief Determine whether an implicit copy constructor for this type 936 /// would have a parameter with a const-qualified reference type. 937 bool implicitCopyConstructorHasConstParam() const { 938 return data().ImplicitCopyConstructorCanHaveConstParamForNonVBase && 939 (isAbstract() || 940 data().ImplicitCopyConstructorCanHaveConstParamForVBase); 941 } 942 943 /// \brief Determine whether this class has a copy constructor with 944 /// a parameter type which is a reference to a const-qualified type. 945 bool hasCopyConstructorWithConstParam() const { 946 return data().HasDeclaredCopyConstructorWithConstParam || 947 (needsImplicitCopyConstructor() && 948 implicitCopyConstructorHasConstParam()); 949 } 950 951 /// \brief Whether this class has a user-declared move constructor or 952 /// assignment operator. 953 /// 954 /// When false, a move constructor and assignment operator may be 955 /// implicitly declared. 956 bool hasUserDeclaredMoveOperation() const { 957 return data().UserDeclaredSpecialMembers & 958 (SMF_MoveConstructor | SMF_MoveAssignment); 959 } 960 961 /// \brief Determine whether this class has had a move constructor 962 /// declared by the user. 963 bool hasUserDeclaredMoveConstructor() const { 964 return data().UserDeclaredSpecialMembers & SMF_MoveConstructor; 965 } 966 967 /// \brief Determine whether this class has a move constructor. 968 bool hasMoveConstructor() const { 969 return (data().DeclaredSpecialMembers & SMF_MoveConstructor) || 970 needsImplicitMoveConstructor(); 971 } 972 973 /// \brief Set that we attempted to declare an implicit copy 974 /// constructor, but overload resolution failed so we deleted it. 975 void setImplicitCopyConstructorIsDeleted() { 976 assert((data().DefaultedCopyConstructorIsDeleted || 977 needsOverloadResolutionForCopyConstructor()) && 978 "Copy constructor should not be deleted"); 979 data().DefaultedCopyConstructorIsDeleted = true; 980 } 981 982 /// \brief Set that we attempted to declare an implicit move 983 /// constructor, but overload resolution failed so we deleted it. 984 void setImplicitMoveConstructorIsDeleted() { 985 assert((data().DefaultedMoveConstructorIsDeleted || 986 needsOverloadResolutionForMoveConstructor()) && 987 "move constructor should not be deleted"); 988 data().DefaultedMoveConstructorIsDeleted = true; 989 } 990 991 /// \brief Set that we attempted to declare an implicit destructor, 992 /// but overload resolution failed so we deleted it. 993 void setImplicitDestructorIsDeleted() { 994 assert((data().DefaultedDestructorIsDeleted || 995 needsOverloadResolutionForDestructor()) && 996 "destructor should not be deleted"); 997 data().DefaultedDestructorIsDeleted = true; 998 } 999 1000 /// \brief Determine whether this class should get an implicit move 1001 /// constructor or if any existing special member function inhibits this. 1002 bool needsImplicitMoveConstructor() const { 1003 return !(data().DeclaredSpecialMembers & SMF_MoveConstructor) && 1004 !hasUserDeclaredCopyConstructor() && 1005 !hasUserDeclaredCopyAssignment() && 1006 !hasUserDeclaredMoveAssignment() && 1007 !hasUserDeclaredDestructor(); 1008 } 1009 1010 /// \brief Determine whether we need to eagerly declare a defaulted move 1011 /// constructor for this class. 1012 bool needsOverloadResolutionForMoveConstructor() const { 1013 return data().NeedOverloadResolutionForMoveConstructor; 1014 } 1015 1016 /// \brief Determine whether this class has a user-declared copy assignment 1017 /// operator. 1018 /// 1019 /// When false, a copy assigment operator will be implicitly declared. 1020 bool hasUserDeclaredCopyAssignment() const { 1021 return data().UserDeclaredSpecialMembers & SMF_CopyAssignment; 1022 } 1023 1024 /// \brief Determine whether this class needs an implicit copy 1025 /// assignment operator to be lazily declared. 1026 bool needsImplicitCopyAssignment() const { 1027 return !(data().DeclaredSpecialMembers & SMF_CopyAssignment); 1028 } 1029 1030 /// \brief Determine whether we need to eagerly declare a defaulted copy 1031 /// assignment operator for this class. 1032 bool needsOverloadResolutionForCopyAssignment() const { 1033 return data().HasMutableFields; 1034 } 1035 1036 /// \brief Determine whether an implicit copy assignment operator for this 1037 /// type would have a parameter with a const-qualified reference type. 1038 bool implicitCopyAssignmentHasConstParam() const { 1039 return data().ImplicitCopyAssignmentHasConstParam; 1040 } 1041 1042 /// \brief Determine whether this class has a copy assignment operator with 1043 /// a parameter type which is a reference to a const-qualified type or is not 1044 /// a reference. 1045 bool hasCopyAssignmentWithConstParam() const { 1046 return data().HasDeclaredCopyAssignmentWithConstParam || 1047 (needsImplicitCopyAssignment() && 1048 implicitCopyAssignmentHasConstParam()); 1049 } 1050 1051 /// \brief Determine whether this class has had a move assignment 1052 /// declared by the user. 1053 bool hasUserDeclaredMoveAssignment() const { 1054 return data().UserDeclaredSpecialMembers & SMF_MoveAssignment; 1055 } 1056 1057 /// \brief Determine whether this class has a move assignment operator. 1058 bool hasMoveAssignment() const { 1059 return (data().DeclaredSpecialMembers & SMF_MoveAssignment) || 1060 needsImplicitMoveAssignment(); 1061 } 1062 1063 /// \brief Set that we attempted to declare an implicit move assignment 1064 /// operator, but overload resolution failed so we deleted it. 1065 void setImplicitMoveAssignmentIsDeleted() { 1066 assert((data().DefaultedMoveAssignmentIsDeleted || 1067 needsOverloadResolutionForMoveAssignment()) && 1068 "move assignment should not be deleted"); 1069 data().DefaultedMoveAssignmentIsDeleted = true; 1070 } 1071 1072 /// \brief Determine whether this class should get an implicit move 1073 /// assignment operator or if any existing special member function inhibits 1074 /// this. 1075 bool needsImplicitMoveAssignment() const { 1076 return !(data().DeclaredSpecialMembers & SMF_MoveAssignment) && 1077 !hasUserDeclaredCopyConstructor() && 1078 !hasUserDeclaredCopyAssignment() && 1079 !hasUserDeclaredMoveConstructor() && 1080 !hasUserDeclaredDestructor() && 1081 // C++1z [expr.prim.lambda]p21: "the closure type has a deleted copy 1082 // assignment operator". The intent is that this counts as a user 1083 // declared copy assignment, but we do not model it that way. 1084 !isLambda(); 1085 } 1086 1087 /// \brief Determine whether we need to eagerly declare a move assignment 1088 /// operator for this class. 1089 bool needsOverloadResolutionForMoveAssignment() const { 1090 return data().NeedOverloadResolutionForMoveAssignment; 1091 } 1092 1093 /// \brief Determine whether this class has a user-declared destructor. 1094 /// 1095 /// When false, a destructor will be implicitly declared. 1096 bool hasUserDeclaredDestructor() const { 1097 return data().UserDeclaredSpecialMembers & SMF_Destructor; 1098 } 1099 1100 /// \brief Determine whether this class needs an implicit destructor to 1101 /// be lazily declared. 1102 bool needsImplicitDestructor() const { 1103 return !(data().DeclaredSpecialMembers & SMF_Destructor); 1104 } 1105 1106 /// \brief Determine whether we need to eagerly declare a destructor for this 1107 /// class. 1108 bool needsOverloadResolutionForDestructor() const { 1109 return data().NeedOverloadResolutionForDestructor; 1110 } 1111 1112 /// \brief Determine whether this class describes a lambda function object. 1113 bool isLambda() const { 1114 // An update record can't turn a non-lambda into a lambda. 1115 auto *DD = DefinitionData; 1116 return DD && DD->IsLambda; 1117 } 1118 1119 /// \brief Determine whether this class describes a generic 1120 /// lambda function object (i.e. function call operator is 1121 /// a template). 1122 bool isGenericLambda() const; 1123 1124 /// \brief Retrieve the lambda call operator of the closure type 1125 /// if this is a closure type. 1126 CXXMethodDecl *getLambdaCallOperator() const; 1127 1128 /// \brief Retrieve the lambda static invoker, the address of which 1129 /// is returned by the conversion operator, and the body of which 1130 /// is forwarded to the lambda call operator. 1131 CXXMethodDecl *getLambdaStaticInvoker() const; 1132 1133 /// \brief Retrieve the generic lambda's template parameter list. 1134 /// Returns null if the class does not represent a lambda or a generic 1135 /// lambda. 1136 TemplateParameterList *getGenericLambdaTemplateParameterList() const; 1137 1138 LambdaCaptureDefault getLambdaCaptureDefault() const { 1139 assert(isLambda()); 1140 return static_cast<LambdaCaptureDefault>(getLambdaData().CaptureDefault); 1141 } 1142 1143 /// \brief For a closure type, retrieve the mapping from captured 1144 /// variables and \c this to the non-static data members that store the 1145 /// values or references of the captures. 1146 /// 1147 /// \param Captures Will be populated with the mapping from captured 1148 /// variables to the corresponding fields. 1149 /// 1150 /// \param ThisCapture Will be set to the field declaration for the 1151 /// \c this capture. 1152 /// 1153 /// \note No entries will be added for init-captures, as they do not capture 1154 /// variables. 1155 void getCaptureFields(llvm::DenseMap<const VarDecl *, FieldDecl *> &Captures, 1156 FieldDecl *&ThisCapture) const; 1157 1158 typedef const LambdaCapture *capture_const_iterator; 1159 typedef llvm::iterator_range<capture_const_iterator> capture_const_range; 1160 1161 capture_const_range captures() const { 1162 return capture_const_range(captures_begin(), captures_end()); 1163 } 1164 capture_const_iterator captures_begin() const { 1165 return isLambda() ? getLambdaData().Captures : nullptr; 1166 } 1167 capture_const_iterator captures_end() const { 1168 return isLambda() ? captures_begin() + getLambdaData().NumCaptures 1169 : nullptr; 1170 } 1171 1172 typedef UnresolvedSetIterator conversion_iterator; 1173 conversion_iterator conversion_begin() const { 1174 return data().Conversions.get(getASTContext()).begin(); 1175 } 1176 conversion_iterator conversion_end() const { 1177 return data().Conversions.get(getASTContext()).end(); 1178 } 1179 1180 /// Removes a conversion function from this class. The conversion 1181 /// function must currently be a member of this class. Furthermore, 1182 /// this class must currently be in the process of being defined. 1183 void removeConversion(const NamedDecl *Old); 1184 1185 /// \brief Get all conversion functions visible in current class, 1186 /// including conversion function templates. 1187 llvm::iterator_range<conversion_iterator> getVisibleConversionFunctions(); 1188 1189 /// Determine whether this class is an aggregate (C++ [dcl.init.aggr]), 1190 /// which is a class with no user-declared constructors, no private 1191 /// or protected non-static data members, no base classes, and no virtual 1192 /// functions (C++ [dcl.init.aggr]p1). 1193 bool isAggregate() const { return data().Aggregate; } 1194 1195 /// \brief Whether this class has any in-class initializers 1196 /// for non-static data members (including those in anonymous unions or 1197 /// structs). 1198 bool hasInClassInitializer() const { return data().HasInClassInitializer; } 1199 1200 /// \brief Whether this class or any of its subobjects has any members of 1201 /// reference type which would make value-initialization ill-formed. 1202 /// 1203 /// Per C++03 [dcl.init]p5: 1204 /// - if T is a non-union class type without a user-declared constructor, 1205 /// then every non-static data member and base-class component of T is 1206 /// value-initialized [...] A program that calls for [...] 1207 /// value-initialization of an entity of reference type is ill-formed. 1208 bool hasUninitializedReferenceMember() const { 1209 return !isUnion() && !hasUserDeclaredConstructor() && 1210 data().HasUninitializedReferenceMember; 1211 } 1212 1213 /// \brief Whether this class is a POD-type (C++ [class]p4) 1214 /// 1215 /// For purposes of this function a class is POD if it is an aggregate 1216 /// that has no non-static non-POD data members, no reference data 1217 /// members, no user-defined copy assignment operator and no 1218 /// user-defined destructor. 1219 /// 1220 /// Note that this is the C++ TR1 definition of POD. 1221 bool isPOD() const { return data().PlainOldData; } 1222 1223 /// \brief True if this class is C-like, without C++-specific features, e.g. 1224 /// it contains only public fields, no bases, tag kind is not 'class', etc. 1225 bool isCLike() const; 1226 1227 /// \brief Determine whether this is an empty class in the sense of 1228 /// (C++11 [meta.unary.prop]). 1229 /// 1230 /// The CXXRecordDecl is a class type, but not a union type, 1231 /// with no non-static data members other than bit-fields of length 0, 1232 /// no virtual member functions, no virtual base classes, 1233 /// and no base class B for which is_empty<B>::value is false. 1234 /// 1235 /// \note This does NOT include a check for union-ness. 1236 bool isEmpty() const { return data().Empty; } 1237 1238 /// \brief Determine whether this class has direct non-static data members. 1239 bool hasDirectFields() const { 1240 auto &D = data(); 1241 return D.HasPublicFields || D.HasProtectedFields || D.HasPrivateFields; 1242 } 1243 1244 /// Whether this class is polymorphic (C++ [class.virtual]), 1245 /// which means that the class contains or inherits a virtual function. 1246 bool isPolymorphic() const { return data().Polymorphic; } 1247 1248 /// \brief Determine whether this class has a pure virtual function. 1249 /// 1250 /// The class is is abstract per (C++ [class.abstract]p2) if it declares 1251 /// a pure virtual function or inherits a pure virtual function that is 1252 /// not overridden. 1253 bool isAbstract() const { return data().Abstract; } 1254 1255 /// \brief Determine whether this class has standard layout per 1256 /// (C++ [class]p7) 1257 bool isStandardLayout() const { return data().IsStandardLayout; } 1258 1259 /// \brief Determine whether this class, or any of its class subobjects, 1260 /// contains a mutable field. 1261 bool hasMutableFields() const { return data().HasMutableFields; } 1262 1263 /// \brief Determine whether this class has any variant members. 1264 bool hasVariantMembers() const { return data().HasVariantMembers; } 1265 1266 /// \brief Determine whether this class has a trivial default constructor 1267 /// (C++11 [class.ctor]p5). 1268 bool hasTrivialDefaultConstructor() const { 1269 return hasDefaultConstructor() && 1270 (data().HasTrivialSpecialMembers & SMF_DefaultConstructor); 1271 } 1272 1273 /// \brief Determine whether this class has a non-trivial default constructor 1274 /// (C++11 [class.ctor]p5). 1275 bool hasNonTrivialDefaultConstructor() const { 1276 return (data().DeclaredNonTrivialSpecialMembers & SMF_DefaultConstructor) || 1277 (needsImplicitDefaultConstructor() && 1278 !(data().HasTrivialSpecialMembers & SMF_DefaultConstructor)); 1279 } 1280 1281 /// \brief Determine whether this class has at least one constexpr constructor 1282 /// other than the copy or move constructors. 1283 bool hasConstexprNonCopyMoveConstructor() const { 1284 return data().HasConstexprNonCopyMoveConstructor || 1285 (needsImplicitDefaultConstructor() && 1286 defaultedDefaultConstructorIsConstexpr()); 1287 } 1288 1289 /// \brief Determine whether a defaulted default constructor for this class 1290 /// would be constexpr. 1291 bool defaultedDefaultConstructorIsConstexpr() const { 1292 return data().DefaultedDefaultConstructorIsConstexpr && 1293 (!isUnion() || hasInClassInitializer() || !hasVariantMembers()); 1294 } 1295 1296 /// \brief Determine whether this class has a constexpr default constructor. 1297 bool hasConstexprDefaultConstructor() const { 1298 return data().HasConstexprDefaultConstructor || 1299 (needsImplicitDefaultConstructor() && 1300 defaultedDefaultConstructorIsConstexpr()); 1301 } 1302 1303 /// \brief Determine whether this class has a trivial copy constructor 1304 /// (C++ [class.copy]p6, C++11 [class.copy]p12) 1305 bool hasTrivialCopyConstructor() const { 1306 return data().HasTrivialSpecialMembers & SMF_CopyConstructor; 1307 } 1308 1309 /// \brief Determine whether this class has a non-trivial copy constructor 1310 /// (C++ [class.copy]p6, C++11 [class.copy]p12) 1311 bool hasNonTrivialCopyConstructor() const { 1312 return data().DeclaredNonTrivialSpecialMembers & SMF_CopyConstructor || 1313 !hasTrivialCopyConstructor(); 1314 } 1315 1316 /// \brief Determine whether this class has a trivial move constructor 1317 /// (C++11 [class.copy]p12) 1318 bool hasTrivialMoveConstructor() const { 1319 return hasMoveConstructor() && 1320 (data().HasTrivialSpecialMembers & SMF_MoveConstructor); 1321 } 1322 1323 /// \brief Determine whether this class has a non-trivial move constructor 1324 /// (C++11 [class.copy]p12) 1325 bool hasNonTrivialMoveConstructor() const { 1326 return (data().DeclaredNonTrivialSpecialMembers & SMF_MoveConstructor) || 1327 (needsImplicitMoveConstructor() && 1328 !(data().HasTrivialSpecialMembers & SMF_MoveConstructor)); 1329 } 1330 1331 /// \brief Determine whether this class has a trivial copy assignment operator 1332 /// (C++ [class.copy]p11, C++11 [class.copy]p25) 1333 bool hasTrivialCopyAssignment() const { 1334 return data().HasTrivialSpecialMembers & SMF_CopyAssignment; 1335 } 1336 1337 /// \brief Determine whether this class has a non-trivial copy assignment 1338 /// operator (C++ [class.copy]p11, C++11 [class.copy]p25) 1339 bool hasNonTrivialCopyAssignment() const { 1340 return data().DeclaredNonTrivialSpecialMembers & SMF_CopyAssignment || 1341 !hasTrivialCopyAssignment(); 1342 } 1343 1344 /// \brief Determine whether this class has a trivial move assignment operator 1345 /// (C++11 [class.copy]p25) 1346 bool hasTrivialMoveAssignment() const { 1347 return hasMoveAssignment() && 1348 (data().HasTrivialSpecialMembers & SMF_MoveAssignment); 1349 } 1350 1351 /// \brief Determine whether this class has a non-trivial move assignment 1352 /// operator (C++11 [class.copy]p25) 1353 bool hasNonTrivialMoveAssignment() const { 1354 return (data().DeclaredNonTrivialSpecialMembers & SMF_MoveAssignment) || 1355 (needsImplicitMoveAssignment() && 1356 !(data().HasTrivialSpecialMembers & SMF_MoveAssignment)); 1357 } 1358 1359 /// \brief Determine whether this class has a trivial destructor 1360 /// (C++ [class.dtor]p3) 1361 bool hasTrivialDestructor() const { 1362 return data().HasTrivialSpecialMembers & SMF_Destructor; 1363 } 1364 1365 /// \brief Determine whether this class has a non-trivial destructor 1366 /// (C++ [class.dtor]p3) 1367 bool hasNonTrivialDestructor() const { 1368 return !(data().HasTrivialSpecialMembers & SMF_Destructor); 1369 } 1370 1371 /// \brief Determine whether declaring a const variable with this type is ok 1372 /// per core issue 253. 1373 bool allowConstDefaultInit() const { 1374 return !data().HasUninitializedFields || 1375 !(data().HasDefaultedDefaultConstructor || 1376 needsImplicitDefaultConstructor()); 1377 } 1378 1379 /// \brief Determine whether this class has a destructor which has no 1380 /// semantic effect. 1381 /// 1382 /// Any such destructor will be trivial, public, defaulted and not deleted, 1383 /// and will call only irrelevant destructors. 1384 bool hasIrrelevantDestructor() const { 1385 return data().HasIrrelevantDestructor; 1386 } 1387 1388 /// \brief Determine whether this class has at least one trivial, non-deleted 1389 /// copy or move constructor. 1390 bool canPassInRegisters() const { 1391 return data().CanPassInRegisters; 1392 } 1393 1394 /// \brief Set that we can pass this RecordDecl in registers. 1395 // FIXME: This should be set as part of completeDefinition. 1396 void setCanPassInRegisters(bool CanPass) { 1397 data().CanPassInRegisters = CanPass; 1398 } 1399 1400 /// \brief Determine whether this class has a non-literal or/ volatile type 1401 /// non-static data member or base class. 1402 bool hasNonLiteralTypeFieldsOrBases() const { 1403 return data().HasNonLiteralTypeFieldsOrBases; 1404 } 1405 1406 /// \brief Determine whether this class has a using-declaration that names 1407 /// a user-declared base class constructor. 1408 bool hasInheritedConstructor() const { 1409 return data().HasInheritedConstructor; 1410 } 1411 1412 /// \brief Determine whether this class has a using-declaration that names 1413 /// a base class assignment operator. 1414 bool hasInheritedAssignment() const { 1415 return data().HasInheritedAssignment; 1416 } 1417 1418 /// \brief Determine whether this class is considered trivially copyable per 1419 /// (C++11 [class]p6). 1420 bool isTriviallyCopyable() const; 1421 1422 /// \brief Determine whether this class is considered trivial. 1423 /// 1424 /// C++11 [class]p6: 1425 /// "A trivial class is a class that has a trivial default constructor and 1426 /// is trivially copiable." 1427 bool isTrivial() const { 1428 return isTriviallyCopyable() && hasTrivialDefaultConstructor(); 1429 } 1430 1431 /// \brief Determine whether this class is a literal type. 1432 /// 1433 /// C++11 [basic.types]p10: 1434 /// A class type that has all the following properties: 1435 /// - it has a trivial destructor 1436 /// - every constructor call and full-expression in the 1437 /// brace-or-equal-intializers for non-static data members (if any) is 1438 /// a constant expression. 1439 /// - it is an aggregate type or has at least one constexpr constructor 1440 /// or constructor template that is not a copy or move constructor, and 1441 /// - all of its non-static data members and base classes are of literal 1442 /// types 1443 /// 1444 /// We resolve DR1361 by ignoring the second bullet. We resolve DR1452 by 1445 /// treating types with trivial default constructors as literal types. 1446 /// 1447 /// Only in C++1z and beyond, are lambdas literal types. 1448 bool isLiteral() const { 1449 return hasTrivialDestructor() && 1450 (!isLambda() || getASTContext().getLangOpts().CPlusPlus1z) && 1451 !hasNonLiteralTypeFieldsOrBases() && 1452 (isAggregate() || isLambda() || 1453 hasConstexprNonCopyMoveConstructor() || 1454 hasTrivialDefaultConstructor()); 1455 } 1456 1457 /// \brief If this record is an instantiation of a member class, 1458 /// retrieves the member class from which it was instantiated. 1459 /// 1460 /// This routine will return non-null for (non-templated) member 1461 /// classes of class templates. For example, given: 1462 /// 1463 /// \code 1464 /// template<typename T> 1465 /// struct X { 1466 /// struct A { }; 1467 /// }; 1468 /// \endcode 1469 /// 1470 /// The declaration for X<int>::A is a (non-templated) CXXRecordDecl 1471 /// whose parent is the class template specialization X<int>. For 1472 /// this declaration, getInstantiatedFromMemberClass() will return 1473 /// the CXXRecordDecl X<T>::A. When a complete definition of 1474 /// X<int>::A is required, it will be instantiated from the 1475 /// declaration returned by getInstantiatedFromMemberClass(). 1476 CXXRecordDecl *getInstantiatedFromMemberClass() const; 1477 1478 /// \brief If this class is an instantiation of a member class of a 1479 /// class template specialization, retrieves the member specialization 1480 /// information. 1481 MemberSpecializationInfo *getMemberSpecializationInfo() const; 1482 1483 /// \brief Specify that this record is an instantiation of the 1484 /// member class \p RD. 1485 void setInstantiationOfMemberClass(CXXRecordDecl *RD, 1486 TemplateSpecializationKind TSK); 1487 1488 /// \brief Retrieves the class template that is described by this 1489 /// class declaration. 1490 /// 1491 /// Every class template is represented as a ClassTemplateDecl and a 1492 /// CXXRecordDecl. The former contains template properties (such as 1493 /// the template parameter lists) while the latter contains the 1494 /// actual description of the template's 1495 /// contents. ClassTemplateDecl::getTemplatedDecl() retrieves the 1496 /// CXXRecordDecl that from a ClassTemplateDecl, while 1497 /// getDescribedClassTemplate() retrieves the ClassTemplateDecl from 1498 /// a CXXRecordDecl. 1499 ClassTemplateDecl *getDescribedClassTemplate() const; 1500 1501 void setDescribedClassTemplate(ClassTemplateDecl *Template); 1502 1503 /// \brief Determine whether this particular class is a specialization or 1504 /// instantiation of a class template or member class of a class template, 1505 /// and how it was instantiated or specialized. 1506 TemplateSpecializationKind getTemplateSpecializationKind() const; 1507 1508 /// \brief Set the kind of specialization or template instantiation this is. 1509 void setTemplateSpecializationKind(TemplateSpecializationKind TSK); 1510 1511 /// \brief Retrieve the record declaration from which this record could be 1512 /// instantiated. Returns null if this class is not a template instantiation. 1513 const CXXRecordDecl *getTemplateInstantiationPattern() const; 1514 1515 CXXRecordDecl *getTemplateInstantiationPattern() { 1516 return const_cast<CXXRecordDecl *>(const_cast<const CXXRecordDecl *>(this) 1517 ->getTemplateInstantiationPattern()); 1518 } 1519 1520 /// \brief Returns the destructor decl for this class. 1521 CXXDestructorDecl *getDestructor() const; 1522 1523 /// \brief Returns true if the class destructor, or any implicitly invoked 1524 /// destructors are marked noreturn. 1525 bool isAnyDestructorNoReturn() const; 1526 1527 /// \brief If the class is a local class [class.local], returns 1528 /// the enclosing function declaration. 1529 const FunctionDecl *isLocalClass() const { 1530 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(getDeclContext())) 1531 return RD->isLocalClass(); 1532 1533 return dyn_cast<FunctionDecl>(getDeclContext()); 1534 } 1535 1536 FunctionDecl *isLocalClass() { 1537 return const_cast<FunctionDecl*>( 1538 const_cast<const CXXRecordDecl*>(this)->isLocalClass()); 1539 } 1540 1541 /// \brief Determine whether this dependent class is a current instantiation, 1542 /// when viewed from within the given context. 1543 bool isCurrentInstantiation(const DeclContext *CurContext) const; 1544 1545 /// \brief Determine whether this class is derived from the class \p Base. 1546 /// 1547 /// This routine only determines whether this class is derived from \p Base, 1548 /// but does not account for factors that may make a Derived -> Base class 1549 /// ill-formed, such as private/protected inheritance or multiple, ambiguous 1550 /// base class subobjects. 1551 /// 1552 /// \param Base the base class we are searching for. 1553 /// 1554 /// \returns true if this class is derived from Base, false otherwise. 1555 bool isDerivedFrom(const CXXRecordDecl *Base) const; 1556 1557 /// \brief Determine whether this class is derived from the type \p Base. 1558 /// 1559 /// This routine only determines whether this class is derived from \p Base, 1560 /// but does not account for factors that may make a Derived -> Base class 1561 /// ill-formed, such as private/protected inheritance or multiple, ambiguous 1562 /// base class subobjects. 1563 /// 1564 /// \param Base the base class we are searching for. 1565 /// 1566 /// \param Paths will contain the paths taken from the current class to the 1567 /// given \p Base class. 1568 /// 1569 /// \returns true if this class is derived from \p Base, false otherwise. 1570 /// 1571 /// \todo add a separate parameter to configure IsDerivedFrom, rather than 1572 /// tangling input and output in \p Paths 1573 bool isDerivedFrom(const CXXRecordDecl *Base, CXXBasePaths &Paths) const; 1574 1575 /// \brief Determine whether this class is virtually derived from 1576 /// the class \p Base. 1577 /// 1578 /// This routine only determines whether this class is virtually 1579 /// derived from \p Base, but does not account for factors that may 1580 /// make a Derived -> Base class ill-formed, such as 1581 /// private/protected inheritance or multiple, ambiguous base class 1582 /// subobjects. 1583 /// 1584 /// \param Base the base class we are searching for. 1585 /// 1586 /// \returns true if this class is virtually derived from Base, 1587 /// false otherwise. 1588 bool isVirtuallyDerivedFrom(const CXXRecordDecl *Base) const; 1589 1590 /// \brief Determine whether this class is provably not derived from 1591 /// the type \p Base. 1592 bool isProvablyNotDerivedFrom(const CXXRecordDecl *Base) const; 1593 1594 /// \brief Function type used by forallBases() as a callback. 1595 /// 1596 /// \param BaseDefinition the definition of the base class 1597 /// 1598 /// \returns true if this base matched the search criteria 1599 typedef llvm::function_ref<bool(const CXXRecordDecl *BaseDefinition)> 1600 ForallBasesCallback; 1601 1602 /// \brief Determines if the given callback holds for all the direct 1603 /// or indirect base classes of this type. 1604 /// 1605 /// The class itself does not count as a base class. This routine 1606 /// returns false if the class has non-computable base classes. 1607 /// 1608 /// \param BaseMatches Callback invoked for each (direct or indirect) base 1609 /// class of this type, or if \p AllowShortCircuit is true then until a call 1610 /// returns false. 1611 /// 1612 /// \param AllowShortCircuit if false, forces the callback to be called 1613 /// for every base class, even if a dependent or non-matching base was 1614 /// found. 1615 bool forallBases(ForallBasesCallback BaseMatches, 1616 bool AllowShortCircuit = true) const; 1617 1618 /// \brief Function type used by lookupInBases() to determine whether a 1619 /// specific base class subobject matches the lookup criteria. 1620 /// 1621 /// \param Specifier the base-class specifier that describes the inheritance 1622 /// from the base class we are trying to match. 1623 /// 1624 /// \param Path the current path, from the most-derived class down to the 1625 /// base named by the \p Specifier. 1626 /// 1627 /// \returns true if this base matched the search criteria, false otherwise. 1628 typedef llvm::function_ref<bool(const CXXBaseSpecifier *Specifier, 1629 CXXBasePath &Path)> BaseMatchesCallback; 1630 1631 /// \brief Look for entities within the base classes of this C++ class, 1632 /// transitively searching all base class subobjects. 1633 /// 1634 /// This routine uses the callback function \p BaseMatches to find base 1635 /// classes meeting some search criteria, walking all base class subobjects 1636 /// and populating the given \p Paths structure with the paths through the 1637 /// inheritance hierarchy that resulted in a match. On a successful search, 1638 /// the \p Paths structure can be queried to retrieve the matching paths and 1639 /// to determine if there were any ambiguities. 1640 /// 1641 /// \param BaseMatches callback function used to determine whether a given 1642 /// base matches the user-defined search criteria. 1643 /// 1644 /// \param Paths used to record the paths from this class to its base class 1645 /// subobjects that match the search criteria. 1646 /// 1647 /// \param LookupInDependent can be set to true to extend the search to 1648 /// dependent base classes. 1649 /// 1650 /// \returns true if there exists any path from this class to a base class 1651 /// subobject that matches the search criteria. 1652 bool lookupInBases(BaseMatchesCallback BaseMatches, CXXBasePaths &Paths, 1653 bool LookupInDependent = false) const; 1654 1655 /// \brief Base-class lookup callback that determines whether the given 1656 /// base class specifier refers to a specific class declaration. 1657 /// 1658 /// This callback can be used with \c lookupInBases() to determine whether 1659 /// a given derived class has is a base class subobject of a particular type. 1660 /// The base record pointer should refer to the canonical CXXRecordDecl of the 1661 /// base class that we are searching for. 1662 static bool FindBaseClass(const CXXBaseSpecifier *Specifier, 1663 CXXBasePath &Path, const CXXRecordDecl *BaseRecord); 1664 1665 /// \brief Base-class lookup callback that determines whether the 1666 /// given base class specifier refers to a specific class 1667 /// declaration and describes virtual derivation. 1668 /// 1669 /// This callback can be used with \c lookupInBases() to determine 1670 /// whether a given derived class has is a virtual base class 1671 /// subobject of a particular type. The base record pointer should 1672 /// refer to the canonical CXXRecordDecl of the base class that we 1673 /// are searching for. 1674 static bool FindVirtualBaseClass(const CXXBaseSpecifier *Specifier, 1675 CXXBasePath &Path, 1676 const CXXRecordDecl *BaseRecord); 1677 1678 /// \brief Base-class lookup callback that determines whether there exists 1679 /// a tag with the given name. 1680 /// 1681 /// This callback can be used with \c lookupInBases() to find tag members 1682 /// of the given name within a C++ class hierarchy. 1683 static bool FindTagMember(const CXXBaseSpecifier *Specifier, 1684 CXXBasePath &Path, DeclarationName Name); 1685 1686 /// \brief Base-class lookup callback that determines whether there exists 1687 /// a member with the given name. 1688 /// 1689 /// This callback can be used with \c lookupInBases() to find members 1690 /// of the given name within a C++ class hierarchy. 1691 static bool FindOrdinaryMember(const CXXBaseSpecifier *Specifier, 1692 CXXBasePath &Path, DeclarationName Name); 1693 1694 /// \brief Base-class lookup callback that determines whether there exists 1695 /// a member with the given name. 1696 /// 1697 /// This callback can be used with \c lookupInBases() to find members 1698 /// of the given name within a C++ class hierarchy, including dependent 1699 /// classes. 1700 static bool 1701 FindOrdinaryMemberInDependentClasses(const CXXBaseSpecifier *Specifier, 1702 CXXBasePath &Path, DeclarationName Name); 1703 1704 /// \brief Base-class lookup callback that determines whether there exists 1705 /// an OpenMP declare reduction member with the given name. 1706 /// 1707 /// This callback can be used with \c lookupInBases() to find members 1708 /// of the given name within a C++ class hierarchy. 1709 static bool FindOMPReductionMember(const CXXBaseSpecifier *Specifier, 1710 CXXBasePath &Path, DeclarationName Name); 1711 1712 /// \brief Base-class lookup callback that determines whether there exists 1713 /// a member with the given name that can be used in a nested-name-specifier. 1714 /// 1715 /// This callback can be used with \c lookupInBases() to find members of 1716 /// the given name within a C++ class hierarchy that can occur within 1717 /// nested-name-specifiers. 1718 static bool FindNestedNameSpecifierMember(const CXXBaseSpecifier *Specifier, 1719 CXXBasePath &Path, 1720 DeclarationName Name); 1721 1722 /// \brief Retrieve the final overriders for each virtual member 1723 /// function in the class hierarchy where this class is the 1724 /// most-derived class in the class hierarchy. 1725 void getFinalOverriders(CXXFinalOverriderMap &FinaOverriders) const; 1726 1727 /// \brief Get the indirect primary bases for this class. 1728 void getIndirectPrimaryBases(CXXIndirectPrimaryBaseSet& Bases) const; 1729 1730 /// Performs an imprecise lookup of a dependent name in this class. 1731 /// 1732 /// This function does not follow strict semantic rules and should be used 1733 /// only when lookup rules can be relaxed, e.g. indexing. 1734 std::vector<const NamedDecl *> 1735 lookupDependentName(const DeclarationName &Name, 1736 llvm::function_ref<bool(const NamedDecl *ND)> Filter); 1737 1738 /// Renders and displays an inheritance diagram 1739 /// for this C++ class and all of its base classes (transitively) using 1740 /// GraphViz. 1741 void viewInheritance(ASTContext& Context) const; 1742 1743 /// \brief Calculates the access of a decl that is reached 1744 /// along a path. 1745 static AccessSpecifier MergeAccess(AccessSpecifier PathAccess, 1746 AccessSpecifier DeclAccess) { 1747 assert(DeclAccess != AS_none); 1748 if (DeclAccess == AS_private) return AS_none; 1749 return (PathAccess > DeclAccess ? PathAccess : DeclAccess); 1750 } 1751 1752 /// \brief Indicates that the declaration of a defaulted or deleted special 1753 /// member function is now complete. 1754 void finishedDefaultedOrDeletedMember(CXXMethodDecl *MD); 1755 1756 /// \brief Indicates that the definition of this class is now complete. 1757 void completeDefinition() override; 1758 1759 /// \brief Indicates that the definition of this class is now complete, 1760 /// and provides a final overrider map to help determine 1761 /// 1762 /// \param FinalOverriders The final overrider map for this class, which can 1763 /// be provided as an optimization for abstract-class checking. If NULL, 1764 /// final overriders will be computed if they are needed to complete the 1765 /// definition. 1766 void completeDefinition(CXXFinalOverriderMap *FinalOverriders); 1767 1768 /// \brief Determine whether this class may end up being abstract, even though 1769 /// it is not yet known to be abstract. 1770 /// 1771 /// \returns true if this class is not known to be abstract but has any 1772 /// base classes that are abstract. In this case, \c completeDefinition() 1773 /// will need to compute final overriders to determine whether the class is 1774 /// actually abstract. 1775 bool mayBeAbstract() const; 1776 1777 /// \brief If this is the closure type of a lambda expression, retrieve the 1778 /// number to be used for name mangling in the Itanium C++ ABI. 1779 /// 1780 /// Zero indicates that this closure type has internal linkage, so the 1781 /// mangling number does not matter, while a non-zero value indicates which 1782 /// lambda expression this is in this particular context. 1783 unsigned getLambdaManglingNumber() const { 1784 assert(isLambda() && "Not a lambda closure type!"); 1785 return getLambdaData().ManglingNumber; 1786 } 1787 1788 /// \brief Retrieve the declaration that provides additional context for a 1789 /// lambda, when the normal declaration context is not specific enough. 1790 /// 1791 /// Certain contexts (default arguments of in-class function parameters and 1792 /// the initializers of data members) have separate name mangling rules for 1793 /// lambdas within the Itanium C++ ABI. For these cases, this routine provides 1794 /// the declaration in which the lambda occurs, e.g., the function parameter 1795 /// or the non-static data member. Otherwise, it returns NULL to imply that 1796 /// the declaration context suffices. 1797 Decl *getLambdaContextDecl() const; 1798 1799 /// \brief Set the mangling number and context declaration for a lambda 1800 /// class. 1801 void setLambdaMangling(unsigned ManglingNumber, Decl *ContextDecl) { 1802 getLambdaData().ManglingNumber = ManglingNumber; 1803 getLambdaData().ContextDecl = ContextDecl; 1804 } 1805 1806 /// \brief Returns the inheritance model used for this record. 1807 MSInheritanceAttr::Spelling getMSInheritanceModel() const; 1808 /// \brief Calculate what the inheritance model would be for this class. 1809 MSInheritanceAttr::Spelling calculateInheritanceModel() const; 1810 1811 /// In the Microsoft C++ ABI, use zero for the field offset of a null data 1812 /// member pointer if we can guarantee that zero is not a valid field offset, 1813 /// or if the member pointer has multiple fields. Polymorphic classes have a 1814 /// vfptr at offset zero, so we can use zero for null. If there are multiple 1815 /// fields, we can use zero even if it is a valid field offset because 1816 /// null-ness testing will check the other fields. 1817 bool nullFieldOffsetIsZero() const { 1818 return !MSInheritanceAttr::hasOnlyOneField(/*IsMemberFunction=*/false, 1819 getMSInheritanceModel()) || 1820 (hasDefinition() && isPolymorphic()); 1821 } 1822 1823 /// \brief Controls when vtordisps will be emitted if this record is used as a 1824 /// virtual base. 1825 MSVtorDispAttr::Mode getMSVtorDispMode() const; 1826 1827 /// \brief Determine whether this lambda expression was known to be dependent 1828 /// at the time it was created, even if its context does not appear to be 1829 /// dependent. 1830 /// 1831 /// This flag is a workaround for an issue with parsing, where default 1832 /// arguments are parsed before their enclosing function declarations have 1833 /// been created. This means that any lambda expressions within those 1834 /// default arguments will have as their DeclContext the context enclosing 1835 /// the function declaration, which may be non-dependent even when the 1836 /// function declaration itself is dependent. This flag indicates when we 1837 /// know that the lambda is dependent despite that. 1838 bool isDependentLambda() const { 1839 return isLambda() && getLambdaData().Dependent; 1840 } 1841 1842 TypeSourceInfo *getLambdaTypeInfo() const { 1843 return getLambdaData().MethodTyInfo; 1844 } 1845 1846 // \brief Determine whether this type is an Interface Like type for 1847 // __interface inheritence purposes. 1848 bool isInterfaceLike() const; 1849 1850 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 1851 static bool classofKind(Kind K) { 1852 return K >= firstCXXRecord && K <= lastCXXRecord; 1853 } 1854 1855 friend class ASTDeclReader; 1856 friend class ASTDeclWriter; 1857 friend class ASTRecordWriter; 1858 friend class ASTReader; 1859 friend class ASTWriter; 1860 }; 1861 1862 /// \brief Represents a C++ deduction guide declaration. 1863 /// 1864 /// \code 1865 /// template<typename T> struct A { A(); A(T); }; 1866 /// A() -> A<int>; 1867 /// \endcode 1868 /// 1869 /// In this example, there will be an explicit deduction guide from the 1870 /// second line, and implicit deduction guide templates synthesized from 1871 /// the constructors of \c A. 1872 class CXXDeductionGuideDecl : public FunctionDecl { 1873 void anchor() override; 1874 private: 1875 CXXDeductionGuideDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, 1876 bool IsExplicit, const DeclarationNameInfo &NameInfo, 1877 QualType T, TypeSourceInfo *TInfo, 1878 SourceLocation EndLocation) 1879 : FunctionDecl(CXXDeductionGuide, C, DC, StartLoc, NameInfo, T, TInfo, 1880 SC_None, false, false) { 1881 if (EndLocation.isValid()) 1882 setRangeEnd(EndLocation); 1883 IsExplicitSpecified = IsExplicit; 1884 } 1885 1886 public: 1887 static CXXDeductionGuideDecl *Create(ASTContext &C, DeclContext *DC, 1888 SourceLocation StartLoc, bool IsExplicit, 1889 const DeclarationNameInfo &NameInfo, 1890 QualType T, TypeSourceInfo *TInfo, 1891 SourceLocation EndLocation); 1892 1893 static CXXDeductionGuideDecl *CreateDeserialized(ASTContext &C, unsigned ID); 1894 1895 /// Whether this deduction guide is explicit. 1896 bool isExplicit() const { return IsExplicitSpecified; } 1897 1898 /// Whether this deduction guide was declared with the 'explicit' specifier. 1899 bool isExplicitSpecified() const { return IsExplicitSpecified; } 1900 1901 /// Get the template for which this guide performs deduction. 1902 TemplateDecl *getDeducedTemplate() const { 1903 return getDeclName().getCXXDeductionGuideTemplate(); 1904 } 1905 1906 // Implement isa/cast/dyncast/etc. 1907 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 1908 static bool classofKind(Kind K) { return K == CXXDeductionGuide; } 1909 1910 friend class ASTDeclReader; 1911 friend class ASTDeclWriter; 1912 }; 1913 1914 /// \brief Represents a static or instance method of a struct/union/class. 1915 /// 1916 /// In the terminology of the C++ Standard, these are the (static and 1917 /// non-static) member functions, whether virtual or not. 1918 class CXXMethodDecl : public FunctionDecl { 1919 void anchor() override; 1920 protected: 1921 CXXMethodDecl(Kind DK, ASTContext &C, CXXRecordDecl *RD, 1922 SourceLocation StartLoc, const DeclarationNameInfo &NameInfo, 1923 QualType T, TypeSourceInfo *TInfo, 1924 StorageClass SC, bool isInline, 1925 bool isConstexpr, SourceLocation EndLocation) 1926 : FunctionDecl(DK, C, RD, StartLoc, NameInfo, T, TInfo, 1927 SC, isInline, isConstexpr) { 1928 if (EndLocation.isValid()) 1929 setRangeEnd(EndLocation); 1930 } 1931 1932 public: 1933 static CXXMethodDecl *Create(ASTContext &C, CXXRecordDecl *RD, 1934 SourceLocation StartLoc, 1935 const DeclarationNameInfo &NameInfo, 1936 QualType T, TypeSourceInfo *TInfo, 1937 StorageClass SC, 1938 bool isInline, 1939 bool isConstexpr, 1940 SourceLocation EndLocation); 1941 1942 static CXXMethodDecl *CreateDeserialized(ASTContext &C, unsigned ID); 1943 1944 bool isStatic() const; 1945 bool isInstance() const { return !isStatic(); } 1946 1947 /// Returns true if the given operator is implicitly static in a record 1948 /// context. 1949 static bool isStaticOverloadedOperator(OverloadedOperatorKind OOK) { 1950 // [class.free]p1: 1951 // Any allocation function for a class T is a static member 1952 // (even if not explicitly declared static). 1953 // [class.free]p6 Any deallocation function for a class X is a static member 1954 // (even if not explicitly declared static). 1955 return OOK == OO_New || OOK == OO_Array_New || OOK == OO_Delete || 1956 OOK == OO_Array_Delete; 1957 } 1958 1959 bool isConst() const { return getType()->castAs<FunctionType>()->isConst(); } 1960 bool isVolatile() const { return getType()->castAs<FunctionType>()->isVolatile(); } 1961 1962 bool isVirtual() const { 1963 CXXMethodDecl *CD = 1964 cast<CXXMethodDecl>(const_cast<CXXMethodDecl*>(this)->getCanonicalDecl()); 1965 1966 // Member function is virtual if it is marked explicitly so, or if it is 1967 // declared in __interface -- then it is automatically pure virtual. 1968 if (CD->isVirtualAsWritten() || CD->isPure()) 1969 return true; 1970 1971 return (CD->begin_overridden_methods() != CD->end_overridden_methods()); 1972 } 1973 1974 /// If it's possible to devirtualize a call to this method, return the called 1975 /// function. Otherwise, return null. 1976 1977 /// \param Base The object on which this virtual function is called. 1978 /// \param IsAppleKext True if we are compiling for Apple kext. 1979 CXXMethodDecl *getDevirtualizedMethod(const Expr *Base, bool IsAppleKext); 1980 1981 const CXXMethodDecl *getDevirtualizedMethod(const Expr *Base, 1982 bool IsAppleKext) const { 1983 return const_cast<CXXMethodDecl *>(this)->getDevirtualizedMethod( 1984 Base, IsAppleKext); 1985 } 1986 1987 /// \brief Determine whether this is a usual deallocation function 1988 /// (C++ [basic.stc.dynamic.deallocation]p2), which is an overloaded 1989 /// delete or delete[] operator with a particular signature. 1990 bool isUsualDeallocationFunction() const; 1991 1992 /// \brief Determine whether this is a copy-assignment operator, regardless 1993 /// of whether it was declared implicitly or explicitly. 1994 bool isCopyAssignmentOperator() const; 1995 1996 /// \brief Determine whether this is a move assignment operator. 1997 bool isMoveAssignmentOperator() const; 1998 1999 CXXMethodDecl *getCanonicalDecl() override { 2000 return cast<CXXMethodDecl>(FunctionDecl::getCanonicalDecl()); 2001 } 2002 const CXXMethodDecl *getCanonicalDecl() const { 2003 return const_cast<CXXMethodDecl*>(this)->getCanonicalDecl(); 2004 } 2005 2006 CXXMethodDecl *getMostRecentDecl() { 2007 return cast<CXXMethodDecl>( 2008 static_cast<FunctionDecl *>(this)->getMostRecentDecl()); 2009 } 2010 const CXXMethodDecl *getMostRecentDecl() const { 2011 return const_cast<CXXMethodDecl*>(this)->getMostRecentDecl(); 2012 } 2013 2014 /// True if this method is user-declared and was not 2015 /// deleted or defaulted on its first declaration. 2016 bool isUserProvided() const { 2017 return !(isDeleted() || getCanonicalDecl()->isDefaulted()); 2018 } 2019 2020 /// 2021 void addOverriddenMethod(const CXXMethodDecl *MD); 2022 2023 typedef const CXXMethodDecl *const* method_iterator; 2024 2025 method_iterator begin_overridden_methods() const; 2026 method_iterator end_overridden_methods() const; 2027 unsigned size_overridden_methods() const; 2028 typedef ASTContext::overridden_method_range overridden_method_range; 2029 overridden_method_range overridden_methods() const; 2030 2031 /// Returns the parent of this method declaration, which 2032 /// is the class in which this method is defined. 2033 const CXXRecordDecl *getParent() const { 2034 return cast<CXXRecordDecl>(FunctionDecl::getParent()); 2035 } 2036 2037 /// Returns the parent of this method declaration, which 2038 /// is the class in which this method is defined. 2039 CXXRecordDecl *getParent() { 2040 return const_cast<CXXRecordDecl *>( 2041 cast<CXXRecordDecl>(FunctionDecl::getParent())); 2042 } 2043 2044 /// \brief Returns the type of the \c this pointer. 2045 /// 2046 /// Should only be called for instance (i.e., non-static) methods. Note 2047 /// that for the call operator of a lambda closure type, this returns the 2048 /// desugared 'this' type (a pointer to the closure type), not the captured 2049 /// 'this' type. 2050 QualType getThisType(ASTContext &C) const; 2051 2052 unsigned getTypeQualifiers() const { 2053 return getType()->getAs<FunctionProtoType>()->getTypeQuals(); 2054 } 2055 2056 /// \brief Retrieve the ref-qualifier associated with this method. 2057 /// 2058 /// In the following example, \c f() has an lvalue ref-qualifier, \c g() 2059 /// has an rvalue ref-qualifier, and \c h() has no ref-qualifier. 2060 /// @code 2061 /// struct X { 2062 /// void f() &; 2063 /// void g() &&; 2064 /// void h(); 2065 /// }; 2066 /// @endcode 2067 RefQualifierKind getRefQualifier() const { 2068 return getType()->getAs<FunctionProtoType>()->getRefQualifier(); 2069 } 2070 2071 bool hasInlineBody() const; 2072 2073 /// \brief Determine whether this is a lambda closure type's static member 2074 /// function that is used for the result of the lambda's conversion to 2075 /// function pointer (for a lambda with no captures). 2076 /// 2077 /// The function itself, if used, will have a placeholder body that will be 2078 /// supplied by IR generation to either forward to the function call operator 2079 /// or clone the function call operator. 2080 bool isLambdaStaticInvoker() const; 2081 2082 /// \brief Find the method in \p RD that corresponds to this one. 2083 /// 2084 /// Find if \p RD or one of the classes it inherits from override this method. 2085 /// If so, return it. \p RD is assumed to be a subclass of the class defining 2086 /// this method (or be the class itself), unless \p MayBeBase is set to true. 2087 CXXMethodDecl * 2088 getCorrespondingMethodInClass(const CXXRecordDecl *RD, 2089 bool MayBeBase = false); 2090 2091 const CXXMethodDecl * 2092 getCorrespondingMethodInClass(const CXXRecordDecl *RD, 2093 bool MayBeBase = false) const { 2094 return const_cast<CXXMethodDecl *>(this) 2095 ->getCorrespondingMethodInClass(RD, MayBeBase); 2096 } 2097 2098 // Implement isa/cast/dyncast/etc. 2099 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2100 static bool classofKind(Kind K) { 2101 return K >= firstCXXMethod && K <= lastCXXMethod; 2102 } 2103 }; 2104 2105 /// \brief Represents a C++ base or member initializer. 2106 /// 2107 /// This is part of a constructor initializer that 2108 /// initializes one non-static member variable or one base class. For 2109 /// example, in the following, both 'A(a)' and 'f(3.14159)' are member 2110 /// initializers: 2111 /// 2112 /// \code 2113 /// class A { }; 2114 /// class B : public A { 2115 /// float f; 2116 /// public: 2117 /// B(A& a) : A(a), f(3.14159) { } 2118 /// }; 2119 /// \endcode 2120 class CXXCtorInitializer final { 2121 /// \brief Either the base class name/delegating constructor type (stored as 2122 /// a TypeSourceInfo*), an normal field (FieldDecl), or an anonymous field 2123 /// (IndirectFieldDecl*) being initialized. 2124 llvm::PointerUnion3<TypeSourceInfo *, FieldDecl *, IndirectFieldDecl *> 2125 Initializee; 2126 2127 /// \brief The source location for the field name or, for a base initializer 2128 /// pack expansion, the location of the ellipsis. 2129 /// 2130 /// In the case of a delegating 2131 /// constructor, it will still include the type's source location as the 2132 /// Initializee points to the CXXConstructorDecl (to allow loop detection). 2133 SourceLocation MemberOrEllipsisLocation; 2134 2135 /// \brief The argument used to initialize the base or member, which may 2136 /// end up constructing an object (when multiple arguments are involved). 2137 Stmt *Init; 2138 2139 /// \brief Location of the left paren of the ctor-initializer. 2140 SourceLocation LParenLoc; 2141 2142 /// \brief Location of the right paren of the ctor-initializer. 2143 SourceLocation RParenLoc; 2144 2145 /// \brief If the initializee is a type, whether that type makes this 2146 /// a delegating initialization. 2147 unsigned IsDelegating : 1; 2148 2149 /// \brief If the initializer is a base initializer, this keeps track 2150 /// of whether the base is virtual or not. 2151 unsigned IsVirtual : 1; 2152 2153 /// \brief Whether or not the initializer is explicitly written 2154 /// in the sources. 2155 unsigned IsWritten : 1; 2156 2157 /// If IsWritten is true, then this number keeps track of the textual order 2158 /// of this initializer in the original sources, counting from 0. 2159 unsigned SourceOrder : 13; 2160 2161 public: 2162 /// \brief Creates a new base-class initializer. 2163 explicit 2164 CXXCtorInitializer(ASTContext &Context, TypeSourceInfo *TInfo, bool IsVirtual, 2165 SourceLocation L, Expr *Init, SourceLocation R, 2166 SourceLocation EllipsisLoc); 2167 2168 /// \brief Creates a new member initializer. 2169 explicit 2170 CXXCtorInitializer(ASTContext &Context, FieldDecl *Member, 2171 SourceLocation MemberLoc, SourceLocation L, Expr *Init, 2172 SourceLocation R); 2173 2174 /// \brief Creates a new anonymous field initializer. 2175 explicit 2176 CXXCtorInitializer(ASTContext &Context, IndirectFieldDecl *Member, 2177 SourceLocation MemberLoc, SourceLocation L, Expr *Init, 2178 SourceLocation R); 2179 2180 /// \brief Creates a new delegating initializer. 2181 explicit 2182 CXXCtorInitializer(ASTContext &Context, TypeSourceInfo *TInfo, 2183 SourceLocation L, Expr *Init, SourceLocation R); 2184 2185 /// \brief Determine whether this initializer is initializing a base class. 2186 bool isBaseInitializer() const { 2187 return Initializee.is<TypeSourceInfo*>() && !IsDelegating; 2188 } 2189 2190 /// \brief Determine whether this initializer is initializing a non-static 2191 /// data member. 2192 bool isMemberInitializer() const { return Initializee.is<FieldDecl*>(); } 2193 2194 bool isAnyMemberInitializer() const { 2195 return isMemberInitializer() || isIndirectMemberInitializer(); 2196 } 2197 2198 bool isIndirectMemberInitializer() const { 2199 return Initializee.is<IndirectFieldDecl*>(); 2200 } 2201 2202 /// \brief Determine whether this initializer is an implicit initializer 2203 /// generated for a field with an initializer defined on the member 2204 /// declaration. 2205 /// 2206 /// In-class member initializers (also known as "non-static data member 2207 /// initializations", NSDMIs) were introduced in C++11. 2208 bool isInClassMemberInitializer() const { 2209 return Init->getStmtClass() == Stmt::CXXDefaultInitExprClass; 2210 } 2211 2212 /// \brief Determine whether this initializer is creating a delegating 2213 /// constructor. 2214 bool isDelegatingInitializer() const { 2215 return Initializee.is<TypeSourceInfo*>() && IsDelegating; 2216 } 2217 2218 /// \brief Determine whether this initializer is a pack expansion. 2219 bool isPackExpansion() const { 2220 return isBaseInitializer() && MemberOrEllipsisLocation.isValid(); 2221 } 2222 2223 // \brief For a pack expansion, returns the location of the ellipsis. 2224 SourceLocation getEllipsisLoc() const { 2225 assert(isPackExpansion() && "Initializer is not a pack expansion"); 2226 return MemberOrEllipsisLocation; 2227 } 2228 2229 /// If this is a base class initializer, returns the type of the 2230 /// base class with location information. Otherwise, returns an NULL 2231 /// type location. 2232 TypeLoc getBaseClassLoc() const; 2233 2234 /// If this is a base class initializer, returns the type of the base class. 2235 /// Otherwise, returns null. 2236 const Type *getBaseClass() const; 2237 2238 /// Returns whether the base is virtual or not. 2239 bool isBaseVirtual() const { 2240 assert(isBaseInitializer() && "Must call this on base initializer!"); 2241 2242 return IsVirtual; 2243 } 2244 2245 /// \brief Returns the declarator information for a base class or delegating 2246 /// initializer. 2247 TypeSourceInfo *getTypeSourceInfo() const { 2248 return Initializee.dyn_cast<TypeSourceInfo *>(); 2249 } 2250 2251 /// \brief If this is a member initializer, returns the declaration of the 2252 /// non-static data member being initialized. Otherwise, returns null. 2253 FieldDecl *getMember() const { 2254 if (isMemberInitializer()) 2255 return Initializee.get<FieldDecl*>(); 2256 return nullptr; 2257 } 2258 FieldDecl *getAnyMember() const { 2259 if (isMemberInitializer()) 2260 return Initializee.get<FieldDecl*>(); 2261 if (isIndirectMemberInitializer()) 2262 return Initializee.get<IndirectFieldDecl*>()->getAnonField(); 2263 return nullptr; 2264 } 2265 2266 IndirectFieldDecl *getIndirectMember() const { 2267 if (isIndirectMemberInitializer()) 2268 return Initializee.get<IndirectFieldDecl*>(); 2269 return nullptr; 2270 } 2271 2272 SourceLocation getMemberLocation() const { 2273 return MemberOrEllipsisLocation; 2274 } 2275 2276 /// \brief Determine the source location of the initializer. 2277 SourceLocation getSourceLocation() const; 2278 2279 /// \brief Determine the source range covering the entire initializer. 2280 SourceRange getSourceRange() const LLVM_READONLY; 2281 2282 /// \brief Determine whether this initializer is explicitly written 2283 /// in the source code. 2284 bool isWritten() const { return IsWritten; } 2285 2286 /// \brief Return the source position of the initializer, counting from 0. 2287 /// If the initializer was implicit, -1 is returned. 2288 int getSourceOrder() const { 2289 return IsWritten ? static_cast<int>(SourceOrder) : -1; 2290 } 2291 2292 /// \brief Set the source order of this initializer. 2293 /// 2294 /// This can only be called once for each initializer; it cannot be called 2295 /// on an initializer having a positive number of (implicit) array indices. 2296 /// 2297 /// This assumes that the initializer was written in the source code, and 2298 /// ensures that isWritten() returns true. 2299 void setSourceOrder(int Pos) { 2300 assert(!IsWritten && 2301 "setSourceOrder() used on implicit initializer"); 2302 assert(SourceOrder == 0 && 2303 "calling twice setSourceOrder() on the same initializer"); 2304 assert(Pos >= 0 && 2305 "setSourceOrder() used to make an initializer implicit"); 2306 IsWritten = true; 2307 SourceOrder = static_cast<unsigned>(Pos); 2308 } 2309 2310 SourceLocation getLParenLoc() const { return LParenLoc; } 2311 SourceLocation getRParenLoc() const { return RParenLoc; } 2312 2313 /// \brief Get the initializer. 2314 Expr *getInit() const { return static_cast<Expr*>(Init); } 2315 }; 2316 2317 /// Description of a constructor that was inherited from a base class. 2318 class InheritedConstructor { 2319 ConstructorUsingShadowDecl *Shadow; 2320 CXXConstructorDecl *BaseCtor; 2321 2322 public: 2323 InheritedConstructor() : Shadow(), BaseCtor() {} 2324 InheritedConstructor(ConstructorUsingShadowDecl *Shadow, 2325 CXXConstructorDecl *BaseCtor) 2326 : Shadow(Shadow), BaseCtor(BaseCtor) {} 2327 2328 explicit operator bool() const { return Shadow; } 2329 2330 ConstructorUsingShadowDecl *getShadowDecl() const { return Shadow; } 2331 CXXConstructorDecl *getConstructor() const { return BaseCtor; } 2332 }; 2333 2334 /// \brief Represents a C++ constructor within a class. 2335 /// 2336 /// For example: 2337 /// 2338 /// \code 2339 /// class X { 2340 /// public: 2341 /// explicit X(int); // represented by a CXXConstructorDecl. 2342 /// }; 2343 /// \endcode 2344 class CXXConstructorDecl final 2345 : public CXXMethodDecl, 2346 private llvm::TrailingObjects<CXXConstructorDecl, InheritedConstructor> { 2347 void anchor() override; 2348 2349 /// \name Support for base and member initializers. 2350 /// \{ 2351 /// \brief The arguments used to initialize the base or member. 2352 LazyCXXCtorInitializersPtr CtorInitializers; 2353 unsigned NumCtorInitializers : 31; 2354 /// \} 2355 2356 /// \brief Whether this constructor declaration is an implicitly-declared 2357 /// inheriting constructor. 2358 unsigned IsInheritingConstructor : 1; 2359 2360 CXXConstructorDecl(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2361 const DeclarationNameInfo &NameInfo, 2362 QualType T, TypeSourceInfo *TInfo, 2363 bool isExplicitSpecified, bool isInline, 2364 bool isImplicitlyDeclared, bool isConstexpr, 2365 InheritedConstructor Inherited) 2366 : CXXMethodDecl(CXXConstructor, C, RD, StartLoc, NameInfo, T, TInfo, 2367 SC_None, isInline, isConstexpr, SourceLocation()), 2368 CtorInitializers(nullptr), NumCtorInitializers(0), 2369 IsInheritingConstructor((bool)Inherited) { 2370 setImplicit(isImplicitlyDeclared); 2371 if (Inherited) 2372 *getTrailingObjects<InheritedConstructor>() = Inherited; 2373 IsExplicitSpecified = isExplicitSpecified; 2374 } 2375 2376 public: 2377 static CXXConstructorDecl *CreateDeserialized(ASTContext &C, unsigned ID, 2378 bool InheritsConstructor); 2379 static CXXConstructorDecl * 2380 Create(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2381 const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo, 2382 bool isExplicit, bool isInline, bool isImplicitlyDeclared, 2383 bool isConstexpr, 2384 InheritedConstructor Inherited = InheritedConstructor()); 2385 2386 /// \brief Iterates through the member/base initializer list. 2387 typedef CXXCtorInitializer **init_iterator; 2388 2389 /// \brief Iterates through the member/base initializer list. 2390 typedef CXXCtorInitializer *const *init_const_iterator; 2391 2392 typedef llvm::iterator_range<init_iterator> init_range; 2393 typedef llvm::iterator_range<init_const_iterator> init_const_range; 2394 2395 init_range inits() { return init_range(init_begin(), init_end()); } 2396 init_const_range inits() const { 2397 return init_const_range(init_begin(), init_end()); 2398 } 2399 2400 /// \brief Retrieve an iterator to the first initializer. 2401 init_iterator init_begin() { 2402 const auto *ConstThis = this; 2403 return const_cast<init_iterator>(ConstThis->init_begin()); 2404 } 2405 /// \brief Retrieve an iterator to the first initializer. 2406 init_const_iterator init_begin() const; 2407 2408 /// \brief Retrieve an iterator past the last initializer. 2409 init_iterator init_end() { 2410 return init_begin() + NumCtorInitializers; 2411 } 2412 /// \brief Retrieve an iterator past the last initializer. 2413 init_const_iterator init_end() const { 2414 return init_begin() + NumCtorInitializers; 2415 } 2416 2417 typedef std::reverse_iterator<init_iterator> init_reverse_iterator; 2418 typedef std::reverse_iterator<init_const_iterator> 2419 init_const_reverse_iterator; 2420 2421 init_reverse_iterator init_rbegin() { 2422 return init_reverse_iterator(init_end()); 2423 } 2424 init_const_reverse_iterator init_rbegin() const { 2425 return init_const_reverse_iterator(init_end()); 2426 } 2427 2428 init_reverse_iterator init_rend() { 2429 return init_reverse_iterator(init_begin()); 2430 } 2431 init_const_reverse_iterator init_rend() const { 2432 return init_const_reverse_iterator(init_begin()); 2433 } 2434 2435 /// \brief Determine the number of arguments used to initialize the member 2436 /// or base. 2437 unsigned getNumCtorInitializers() const { 2438 return NumCtorInitializers; 2439 } 2440 2441 void setNumCtorInitializers(unsigned numCtorInitializers) { 2442 NumCtorInitializers = numCtorInitializers; 2443 } 2444 2445 void setCtorInitializers(CXXCtorInitializer **Initializers) { 2446 CtorInitializers = Initializers; 2447 } 2448 2449 /// Whether this function is marked as explicit explicitly. 2450 bool isExplicitSpecified() const { return IsExplicitSpecified; } 2451 2452 /// Whether this function is explicit. 2453 bool isExplicit() const { 2454 return getCanonicalDecl()->isExplicitSpecified(); 2455 } 2456 2457 /// \brief Determine whether this constructor is a delegating constructor. 2458 bool isDelegatingConstructor() const { 2459 return (getNumCtorInitializers() == 1) && 2460 init_begin()[0]->isDelegatingInitializer(); 2461 } 2462 2463 /// \brief When this constructor delegates to another, retrieve the target. 2464 CXXConstructorDecl *getTargetConstructor() const; 2465 2466 /// Whether this constructor is a default 2467 /// constructor (C++ [class.ctor]p5), which can be used to 2468 /// default-initialize a class of this type. 2469 bool isDefaultConstructor() const; 2470 2471 /// \brief Whether this constructor is a copy constructor (C++ [class.copy]p2, 2472 /// which can be used to copy the class. 2473 /// 2474 /// \p TypeQuals will be set to the qualifiers on the 2475 /// argument type. For example, \p TypeQuals would be set to \c 2476 /// Qualifiers::Const for the following copy constructor: 2477 /// 2478 /// \code 2479 /// class X { 2480 /// public: 2481 /// X(const X&); 2482 /// }; 2483 /// \endcode 2484 bool isCopyConstructor(unsigned &TypeQuals) const; 2485 2486 /// Whether this constructor is a copy 2487 /// constructor (C++ [class.copy]p2, which can be used to copy the 2488 /// class. 2489 bool isCopyConstructor() const { 2490 unsigned TypeQuals = 0; 2491 return isCopyConstructor(TypeQuals); 2492 } 2493 2494 /// \brief Determine whether this constructor is a move constructor 2495 /// (C++11 [class.copy]p3), which can be used to move values of the class. 2496 /// 2497 /// \param TypeQuals If this constructor is a move constructor, will be set 2498 /// to the type qualifiers on the referent of the first parameter's type. 2499 bool isMoveConstructor(unsigned &TypeQuals) const; 2500 2501 /// \brief Determine whether this constructor is a move constructor 2502 /// (C++11 [class.copy]p3), which can be used to move values of the class. 2503 bool isMoveConstructor() const { 2504 unsigned TypeQuals = 0; 2505 return isMoveConstructor(TypeQuals); 2506 } 2507 2508 /// \brief Determine whether this is a copy or move constructor. 2509 /// 2510 /// \param TypeQuals Will be set to the type qualifiers on the reference 2511 /// parameter, if in fact this is a copy or move constructor. 2512 bool isCopyOrMoveConstructor(unsigned &TypeQuals) const; 2513 2514 /// \brief Determine whether this a copy or move constructor. 2515 bool isCopyOrMoveConstructor() const { 2516 unsigned Quals; 2517 return isCopyOrMoveConstructor(Quals); 2518 } 2519 2520 /// Whether this constructor is a 2521 /// converting constructor (C++ [class.conv.ctor]), which can be 2522 /// used for user-defined conversions. 2523 bool isConvertingConstructor(bool AllowExplicit) const; 2524 2525 /// \brief Determine whether this is a member template specialization that 2526 /// would copy the object to itself. Such constructors are never used to copy 2527 /// an object. 2528 bool isSpecializationCopyingObject() const; 2529 2530 /// \brief Determine whether this is an implicit constructor synthesized to 2531 /// model a call to a constructor inherited from a base class. 2532 bool isInheritingConstructor() const { return IsInheritingConstructor; } 2533 2534 /// \brief Get the constructor that this inheriting constructor is based on. 2535 InheritedConstructor getInheritedConstructor() const { 2536 return IsInheritingConstructor ? *getTrailingObjects<InheritedConstructor>() 2537 : InheritedConstructor(); 2538 } 2539 2540 CXXConstructorDecl *getCanonicalDecl() override { 2541 return cast<CXXConstructorDecl>(FunctionDecl::getCanonicalDecl()); 2542 } 2543 const CXXConstructorDecl *getCanonicalDecl() const { 2544 return const_cast<CXXConstructorDecl*>(this)->getCanonicalDecl(); 2545 } 2546 2547 // Implement isa/cast/dyncast/etc. 2548 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2549 static bool classofKind(Kind K) { return K == CXXConstructor; } 2550 2551 friend class ASTDeclReader; 2552 friend class ASTDeclWriter; 2553 friend TrailingObjects; 2554 }; 2555 2556 /// \brief Represents a C++ destructor within a class. 2557 /// 2558 /// For example: 2559 /// 2560 /// \code 2561 /// class X { 2562 /// public: 2563 /// ~X(); // represented by a CXXDestructorDecl. 2564 /// }; 2565 /// \endcode 2566 class CXXDestructorDecl : public CXXMethodDecl { 2567 void anchor() override; 2568 2569 // FIXME: Don't allocate storage for these except in the first declaration 2570 // of a virtual destructor. 2571 FunctionDecl *OperatorDelete; 2572 Expr *OperatorDeleteThisArg; 2573 2574 CXXDestructorDecl(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2575 const DeclarationNameInfo &NameInfo, 2576 QualType T, TypeSourceInfo *TInfo, 2577 bool isInline, bool isImplicitlyDeclared) 2578 : CXXMethodDecl(CXXDestructor, C, RD, StartLoc, NameInfo, T, TInfo, 2579 SC_None, isInline, /*isConstexpr=*/false, SourceLocation()), 2580 OperatorDelete(nullptr), OperatorDeleteThisArg(nullptr) { 2581 setImplicit(isImplicitlyDeclared); 2582 } 2583 2584 public: 2585 static CXXDestructorDecl *Create(ASTContext &C, CXXRecordDecl *RD, 2586 SourceLocation StartLoc, 2587 const DeclarationNameInfo &NameInfo, 2588 QualType T, TypeSourceInfo* TInfo, 2589 bool isInline, 2590 bool isImplicitlyDeclared); 2591 static CXXDestructorDecl *CreateDeserialized(ASTContext & C, unsigned ID); 2592 2593 void setOperatorDelete(FunctionDecl *OD, Expr *ThisArg); 2594 const FunctionDecl *getOperatorDelete() const { 2595 return getCanonicalDecl()->OperatorDelete; 2596 } 2597 Expr *getOperatorDeleteThisArg() const { 2598 return getCanonicalDecl()->OperatorDeleteThisArg; 2599 } 2600 2601 CXXDestructorDecl *getCanonicalDecl() override { 2602 return cast<CXXDestructorDecl>(FunctionDecl::getCanonicalDecl()); 2603 } 2604 const CXXDestructorDecl *getCanonicalDecl() const { 2605 return const_cast<CXXDestructorDecl*>(this)->getCanonicalDecl(); 2606 } 2607 2608 // Implement isa/cast/dyncast/etc. 2609 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2610 static bool classofKind(Kind K) { return K == CXXDestructor; } 2611 2612 friend class ASTDeclReader; 2613 friend class ASTDeclWriter; 2614 }; 2615 2616 /// \brief Represents a C++ conversion function within a class. 2617 /// 2618 /// For example: 2619 /// 2620 /// \code 2621 /// class X { 2622 /// public: 2623 /// operator bool(); 2624 /// }; 2625 /// \endcode 2626 class CXXConversionDecl : public CXXMethodDecl { 2627 void anchor() override; 2628 2629 CXXConversionDecl(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2630 const DeclarationNameInfo &NameInfo, QualType T, 2631 TypeSourceInfo *TInfo, bool isInline, 2632 bool isExplicitSpecified, bool isConstexpr, 2633 SourceLocation EndLocation) 2634 : CXXMethodDecl(CXXConversion, C, RD, StartLoc, NameInfo, T, TInfo, 2635 SC_None, isInline, isConstexpr, EndLocation) { 2636 IsExplicitSpecified = isExplicitSpecified; 2637 } 2638 2639 public: 2640 static CXXConversionDecl *Create(ASTContext &C, CXXRecordDecl *RD, 2641 SourceLocation StartLoc, 2642 const DeclarationNameInfo &NameInfo, 2643 QualType T, TypeSourceInfo *TInfo, 2644 bool isInline, bool isExplicit, 2645 bool isConstexpr, 2646 SourceLocation EndLocation); 2647 static CXXConversionDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2648 2649 /// Whether this function is marked as explicit explicitly. 2650 bool isExplicitSpecified() const { return IsExplicitSpecified; } 2651 2652 /// Whether this function is explicit. 2653 bool isExplicit() const { 2654 return getCanonicalDecl()->isExplicitSpecified(); 2655 } 2656 2657 /// \brief Returns the type that this conversion function is converting to. 2658 QualType getConversionType() const { 2659 return getType()->getAs<FunctionType>()->getReturnType(); 2660 } 2661 2662 /// \brief Determine whether this conversion function is a conversion from 2663 /// a lambda closure type to a block pointer. 2664 bool isLambdaToBlockPointerConversion() const; 2665 2666 CXXConversionDecl *getCanonicalDecl() override { 2667 return cast<CXXConversionDecl>(FunctionDecl::getCanonicalDecl()); 2668 } 2669 const CXXConversionDecl *getCanonicalDecl() const { 2670 return const_cast<CXXConversionDecl*>(this)->getCanonicalDecl(); 2671 } 2672 2673 // Implement isa/cast/dyncast/etc. 2674 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2675 static bool classofKind(Kind K) { return K == CXXConversion; } 2676 2677 friend class ASTDeclReader; 2678 friend class ASTDeclWriter; 2679 }; 2680 2681 /// \brief Represents a linkage specification. 2682 /// 2683 /// For example: 2684 /// \code 2685 /// extern "C" void foo(); 2686 /// \endcode 2687 class LinkageSpecDecl : public Decl, public DeclContext { 2688 virtual void anchor(); 2689 public: 2690 /// \brief Represents the language in a linkage specification. 2691 /// 2692 /// The values are part of the serialization ABI for 2693 /// ASTs and cannot be changed without altering that ABI. To help 2694 /// ensure a stable ABI for this, we choose the DW_LANG_ encodings 2695 /// from the dwarf standard. 2696 enum LanguageIDs { 2697 lang_c = /* DW_LANG_C */ 0x0002, 2698 lang_cxx = /* DW_LANG_C_plus_plus */ 0x0004 2699 }; 2700 private: 2701 /// \brief The language for this linkage specification. 2702 unsigned Language : 3; 2703 /// \brief True if this linkage spec has braces. 2704 /// 2705 /// This is needed so that hasBraces() returns the correct result while the 2706 /// linkage spec body is being parsed. Once RBraceLoc has been set this is 2707 /// not used, so it doesn't need to be serialized. 2708 unsigned HasBraces : 1; 2709 /// \brief The source location for the extern keyword. 2710 SourceLocation ExternLoc; 2711 /// \brief The source location for the right brace (if valid). 2712 SourceLocation RBraceLoc; 2713 2714 LinkageSpecDecl(DeclContext *DC, SourceLocation ExternLoc, 2715 SourceLocation LangLoc, LanguageIDs lang, bool HasBraces) 2716 : Decl(LinkageSpec, DC, LangLoc), DeclContext(LinkageSpec), 2717 Language(lang), HasBraces(HasBraces), ExternLoc(ExternLoc), 2718 RBraceLoc(SourceLocation()) { } 2719 2720 public: 2721 static LinkageSpecDecl *Create(ASTContext &C, DeclContext *DC, 2722 SourceLocation ExternLoc, 2723 SourceLocation LangLoc, LanguageIDs Lang, 2724 bool HasBraces); 2725 static LinkageSpecDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2726 2727 /// \brief Return the language specified by this linkage specification. 2728 LanguageIDs getLanguage() const { return LanguageIDs(Language); } 2729 /// \brief Set the language specified by this linkage specification. 2730 void setLanguage(LanguageIDs L) { Language = L; } 2731 2732 /// \brief Determines whether this linkage specification had braces in 2733 /// its syntactic form. 2734 bool hasBraces() const { 2735 assert(!RBraceLoc.isValid() || HasBraces); 2736 return HasBraces; 2737 } 2738 2739 SourceLocation getExternLoc() const { return ExternLoc; } 2740 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2741 void setExternLoc(SourceLocation L) { ExternLoc = L; } 2742 void setRBraceLoc(SourceLocation L) { 2743 RBraceLoc = L; 2744 HasBraces = RBraceLoc.isValid(); 2745 } 2746 2747 SourceLocation getLocEnd() const LLVM_READONLY { 2748 if (hasBraces()) 2749 return getRBraceLoc(); 2750 // No braces: get the end location of the (only) declaration in context 2751 // (if present). 2752 return decls_empty() ? getLocation() : decls_begin()->getLocEnd(); 2753 } 2754 2755 SourceRange getSourceRange() const override LLVM_READONLY { 2756 return SourceRange(ExternLoc, getLocEnd()); 2757 } 2758 2759 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2760 static bool classofKind(Kind K) { return K == LinkageSpec; } 2761 static DeclContext *castToDeclContext(const LinkageSpecDecl *D) { 2762 return static_cast<DeclContext *>(const_cast<LinkageSpecDecl*>(D)); 2763 } 2764 static LinkageSpecDecl *castFromDeclContext(const DeclContext *DC) { 2765 return static_cast<LinkageSpecDecl *>(const_cast<DeclContext*>(DC)); 2766 } 2767 }; 2768 2769 /// \brief Represents C++ using-directive. 2770 /// 2771 /// For example: 2772 /// \code 2773 /// using namespace std; 2774 /// \endcode 2775 /// 2776 /// \note UsingDirectiveDecl should be Decl not NamedDecl, but we provide 2777 /// artificial names for all using-directives in order to store 2778 /// them in DeclContext effectively. 2779 class UsingDirectiveDecl : public NamedDecl { 2780 void anchor() override; 2781 /// \brief The location of the \c using keyword. 2782 SourceLocation UsingLoc; 2783 2784 /// \brief The location of the \c namespace keyword. 2785 SourceLocation NamespaceLoc; 2786 2787 /// \brief The nested-name-specifier that precedes the namespace. 2788 NestedNameSpecifierLoc QualifierLoc; 2789 2790 /// \brief The namespace nominated by this using-directive. 2791 NamedDecl *NominatedNamespace; 2792 2793 /// Enclosing context containing both using-directive and nominated 2794 /// namespace. 2795 DeclContext *CommonAncestor; 2796 2797 /// \brief Returns special DeclarationName used by using-directives. 2798 /// 2799 /// This is only used by DeclContext for storing UsingDirectiveDecls in 2800 /// its lookup structure. 2801 static DeclarationName getName() { 2802 return DeclarationName::getUsingDirectiveName(); 2803 } 2804 2805 UsingDirectiveDecl(DeclContext *DC, SourceLocation UsingLoc, 2806 SourceLocation NamespcLoc, 2807 NestedNameSpecifierLoc QualifierLoc, 2808 SourceLocation IdentLoc, 2809 NamedDecl *Nominated, 2810 DeclContext *CommonAncestor) 2811 : NamedDecl(UsingDirective, DC, IdentLoc, getName()), UsingLoc(UsingLoc), 2812 NamespaceLoc(NamespcLoc), QualifierLoc(QualifierLoc), 2813 NominatedNamespace(Nominated), CommonAncestor(CommonAncestor) { } 2814 2815 public: 2816 /// \brief Retrieve the nested-name-specifier that qualifies the 2817 /// name of the namespace, with source-location information. 2818 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 2819 2820 /// \brief Retrieve the nested-name-specifier that qualifies the 2821 /// name of the namespace. 2822 NestedNameSpecifier *getQualifier() const { 2823 return QualifierLoc.getNestedNameSpecifier(); 2824 } 2825 2826 NamedDecl *getNominatedNamespaceAsWritten() { return NominatedNamespace; } 2827 const NamedDecl *getNominatedNamespaceAsWritten() const { 2828 return NominatedNamespace; 2829 } 2830 2831 /// \brief Returns the namespace nominated by this using-directive. 2832 NamespaceDecl *getNominatedNamespace(); 2833 2834 const NamespaceDecl *getNominatedNamespace() const { 2835 return const_cast<UsingDirectiveDecl*>(this)->getNominatedNamespace(); 2836 } 2837 2838 /// \brief Returns the common ancestor context of this using-directive and 2839 /// its nominated namespace. 2840 DeclContext *getCommonAncestor() { return CommonAncestor; } 2841 const DeclContext *getCommonAncestor() const { return CommonAncestor; } 2842 2843 /// \brief Return the location of the \c using keyword. 2844 SourceLocation getUsingLoc() const { return UsingLoc; } 2845 2846 // FIXME: Could omit 'Key' in name. 2847 /// \brief Returns the location of the \c namespace keyword. 2848 SourceLocation getNamespaceKeyLocation() const { return NamespaceLoc; } 2849 2850 /// \brief Returns the location of this using declaration's identifier. 2851 SourceLocation getIdentLocation() const { return getLocation(); } 2852 2853 static UsingDirectiveDecl *Create(ASTContext &C, DeclContext *DC, 2854 SourceLocation UsingLoc, 2855 SourceLocation NamespaceLoc, 2856 NestedNameSpecifierLoc QualifierLoc, 2857 SourceLocation IdentLoc, 2858 NamedDecl *Nominated, 2859 DeclContext *CommonAncestor); 2860 static UsingDirectiveDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2861 2862 SourceRange getSourceRange() const override LLVM_READONLY { 2863 return SourceRange(UsingLoc, getLocation()); 2864 } 2865 2866 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2867 static bool classofKind(Kind K) { return K == UsingDirective; } 2868 2869 // Friend for getUsingDirectiveName. 2870 friend class DeclContext; 2871 2872 friend class ASTDeclReader; 2873 }; 2874 2875 /// \brief Represents a C++ namespace alias. 2876 /// 2877 /// For example: 2878 /// 2879 /// \code 2880 /// namespace Foo = Bar; 2881 /// \endcode 2882 class NamespaceAliasDecl : public NamedDecl, 2883 public Redeclarable<NamespaceAliasDecl> { 2884 void anchor() override; 2885 2886 /// \brief The location of the \c namespace keyword. 2887 SourceLocation NamespaceLoc; 2888 2889 /// \brief The location of the namespace's identifier. 2890 /// 2891 /// This is accessed by TargetNameLoc. 2892 SourceLocation IdentLoc; 2893 2894 /// \brief The nested-name-specifier that precedes the namespace. 2895 NestedNameSpecifierLoc QualifierLoc; 2896 2897 /// \brief The Decl that this alias points to, either a NamespaceDecl or 2898 /// a NamespaceAliasDecl. 2899 NamedDecl *Namespace; 2900 2901 NamespaceAliasDecl(ASTContext &C, DeclContext *DC, 2902 SourceLocation NamespaceLoc, SourceLocation AliasLoc, 2903 IdentifierInfo *Alias, NestedNameSpecifierLoc QualifierLoc, 2904 SourceLocation IdentLoc, NamedDecl *Namespace) 2905 : NamedDecl(NamespaceAlias, DC, AliasLoc, Alias), redeclarable_base(C), 2906 NamespaceLoc(NamespaceLoc), IdentLoc(IdentLoc), 2907 QualifierLoc(QualifierLoc), Namespace(Namespace) {} 2908 2909 typedef Redeclarable<NamespaceAliasDecl> redeclarable_base; 2910 NamespaceAliasDecl *getNextRedeclarationImpl() override; 2911 NamespaceAliasDecl *getPreviousDeclImpl() override; 2912 NamespaceAliasDecl *getMostRecentDeclImpl() override; 2913 2914 friend class ASTDeclReader; 2915 2916 public: 2917 static NamespaceAliasDecl *Create(ASTContext &C, DeclContext *DC, 2918 SourceLocation NamespaceLoc, 2919 SourceLocation AliasLoc, 2920 IdentifierInfo *Alias, 2921 NestedNameSpecifierLoc QualifierLoc, 2922 SourceLocation IdentLoc, 2923 NamedDecl *Namespace); 2924 2925 static NamespaceAliasDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2926 2927 typedef redeclarable_base::redecl_range redecl_range; 2928 typedef redeclarable_base::redecl_iterator redecl_iterator; 2929 using redeclarable_base::redecls_begin; 2930 using redeclarable_base::redecls_end; 2931 using redeclarable_base::redecls; 2932 using redeclarable_base::getPreviousDecl; 2933 using redeclarable_base::getMostRecentDecl; 2934 2935 NamespaceAliasDecl *getCanonicalDecl() override { 2936 return getFirstDecl(); 2937 } 2938 const NamespaceAliasDecl *getCanonicalDecl() const { 2939 return getFirstDecl(); 2940 } 2941 2942 /// \brief Retrieve the nested-name-specifier that qualifies the 2943 /// name of the namespace, with source-location information. 2944 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 2945 2946 /// \brief Retrieve the nested-name-specifier that qualifies the 2947 /// name of the namespace. 2948 NestedNameSpecifier *getQualifier() const { 2949 return QualifierLoc.getNestedNameSpecifier(); 2950 } 2951 2952 /// \brief Retrieve the namespace declaration aliased by this directive. 2953 NamespaceDecl *getNamespace() { 2954 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(Namespace)) 2955 return AD->getNamespace(); 2956 2957 return cast<NamespaceDecl>(Namespace); 2958 } 2959 2960 const NamespaceDecl *getNamespace() const { 2961 return const_cast<NamespaceAliasDecl*>(this)->getNamespace(); 2962 } 2963 2964 /// Returns the location of the alias name, i.e. 'foo' in 2965 /// "namespace foo = ns::bar;". 2966 SourceLocation getAliasLoc() const { return getLocation(); } 2967 2968 /// Returns the location of the \c namespace keyword. 2969 SourceLocation getNamespaceLoc() const { return NamespaceLoc; } 2970 2971 /// Returns the location of the identifier in the named namespace. 2972 SourceLocation getTargetNameLoc() const { return IdentLoc; } 2973 2974 /// \brief Retrieve the namespace that this alias refers to, which 2975 /// may either be a NamespaceDecl or a NamespaceAliasDecl. 2976 NamedDecl *getAliasedNamespace() const { return Namespace; } 2977 2978 SourceRange getSourceRange() const override LLVM_READONLY { 2979 return SourceRange(NamespaceLoc, IdentLoc); 2980 } 2981 2982 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2983 static bool classofKind(Kind K) { return K == NamespaceAlias; } 2984 }; 2985 2986 /// \brief Represents a shadow declaration introduced into a scope by a 2987 /// (resolved) using declaration. 2988 /// 2989 /// For example, 2990 /// \code 2991 /// namespace A { 2992 /// void foo(); 2993 /// } 2994 /// namespace B { 2995 /// using A::foo; // <- a UsingDecl 2996 /// // Also creates a UsingShadowDecl for A::foo() in B 2997 /// } 2998 /// \endcode 2999 class UsingShadowDecl : public NamedDecl, public Redeclarable<UsingShadowDecl> { 3000 void anchor() override; 3001 3002 /// The referenced declaration. 3003 NamedDecl *Underlying; 3004 3005 /// \brief The using declaration which introduced this decl or the next using 3006 /// shadow declaration contained in the aforementioned using declaration. 3007 NamedDecl *UsingOrNextShadow; 3008 friend class UsingDecl; 3009 3010 typedef Redeclarable<UsingShadowDecl> redeclarable_base; 3011 UsingShadowDecl *getNextRedeclarationImpl() override { 3012 return getNextRedeclaration(); 3013 } 3014 UsingShadowDecl *getPreviousDeclImpl() override { 3015 return getPreviousDecl(); 3016 } 3017 UsingShadowDecl *getMostRecentDeclImpl() override { 3018 return getMostRecentDecl(); 3019 } 3020 3021 protected: 3022 UsingShadowDecl(Kind K, ASTContext &C, DeclContext *DC, SourceLocation Loc, 3023 UsingDecl *Using, NamedDecl *Target); 3024 UsingShadowDecl(Kind K, ASTContext &C, EmptyShell); 3025 3026 public: 3027 static UsingShadowDecl *Create(ASTContext &C, DeclContext *DC, 3028 SourceLocation Loc, UsingDecl *Using, 3029 NamedDecl *Target) { 3030 return new (C, DC) UsingShadowDecl(UsingShadow, C, DC, Loc, Using, Target); 3031 } 3032 3033 static UsingShadowDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3034 3035 typedef redeclarable_base::redecl_range redecl_range; 3036 typedef redeclarable_base::redecl_iterator redecl_iterator; 3037 using redeclarable_base::redecls_begin; 3038 using redeclarable_base::redecls_end; 3039 using redeclarable_base::redecls; 3040 using redeclarable_base::getPreviousDecl; 3041 using redeclarable_base::getMostRecentDecl; 3042 using redeclarable_base::isFirstDecl; 3043 3044 UsingShadowDecl *getCanonicalDecl() override { 3045 return getFirstDecl(); 3046 } 3047 const UsingShadowDecl *getCanonicalDecl() const { 3048 return getFirstDecl(); 3049 } 3050 3051 /// \brief Gets the underlying declaration which has been brought into the 3052 /// local scope. 3053 NamedDecl *getTargetDecl() const { return Underlying; } 3054 3055 /// \brief Sets the underlying declaration which has been brought into the 3056 /// local scope. 3057 void setTargetDecl(NamedDecl* ND) { 3058 assert(ND && "Target decl is null!"); 3059 Underlying = ND; 3060 IdentifierNamespace = ND->getIdentifierNamespace(); 3061 } 3062 3063 /// \brief Gets the using declaration to which this declaration is tied. 3064 UsingDecl *getUsingDecl() const; 3065 3066 /// \brief The next using shadow declaration contained in the shadow decl 3067 /// chain of the using declaration which introduced this decl. 3068 UsingShadowDecl *getNextUsingShadowDecl() const { 3069 return dyn_cast_or_null<UsingShadowDecl>(UsingOrNextShadow); 3070 } 3071 3072 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3073 static bool classofKind(Kind K) { 3074 return K == Decl::UsingShadow || K == Decl::ConstructorUsingShadow; 3075 } 3076 3077 friend class ASTDeclReader; 3078 friend class ASTDeclWriter; 3079 }; 3080 3081 /// \brief Represents a shadow constructor declaration introduced into a 3082 /// class by a C++11 using-declaration that names a constructor. 3083 /// 3084 /// For example: 3085 /// \code 3086 /// struct Base { Base(int); }; 3087 /// struct Derived { 3088 /// using Base::Base; // creates a UsingDecl and a ConstructorUsingShadowDecl 3089 /// }; 3090 /// \endcode 3091 class ConstructorUsingShadowDecl final : public UsingShadowDecl { 3092 void anchor() override; 3093 3094 /// \brief If this constructor using declaration inherted the constructor 3095 /// from an indirect base class, this is the ConstructorUsingShadowDecl 3096 /// in the named direct base class from which the declaration was inherited. 3097 ConstructorUsingShadowDecl *NominatedBaseClassShadowDecl; 3098 3099 /// \brief If this constructor using declaration inherted the constructor 3100 /// from an indirect base class, this is the ConstructorUsingShadowDecl 3101 /// that will be used to construct the unique direct or virtual base class 3102 /// that receives the constructor arguments. 3103 ConstructorUsingShadowDecl *ConstructedBaseClassShadowDecl; 3104 3105 /// \brief \c true if the constructor ultimately named by this using shadow 3106 /// declaration is within a virtual base class subobject of the class that 3107 /// contains this declaration. 3108 unsigned IsVirtual : 1; 3109 3110 ConstructorUsingShadowDecl(ASTContext &C, DeclContext *DC, SourceLocation Loc, 3111 UsingDecl *Using, NamedDecl *Target, 3112 bool TargetInVirtualBase) 3113 : UsingShadowDecl(ConstructorUsingShadow, C, DC, Loc, Using, 3114 Target->getUnderlyingDecl()), 3115 NominatedBaseClassShadowDecl( 3116 dyn_cast<ConstructorUsingShadowDecl>(Target)), 3117 ConstructedBaseClassShadowDecl(NominatedBaseClassShadowDecl), 3118 IsVirtual(TargetInVirtualBase) { 3119 // If we found a constructor that chains to a constructor for a virtual 3120 // base, we should directly call that virtual base constructor instead. 3121 // FIXME: This logic belongs in Sema. 3122 if (NominatedBaseClassShadowDecl && 3123 NominatedBaseClassShadowDecl->constructsVirtualBase()) { 3124 ConstructedBaseClassShadowDecl = 3125 NominatedBaseClassShadowDecl->ConstructedBaseClassShadowDecl; 3126 IsVirtual = true; 3127 } 3128 } 3129 ConstructorUsingShadowDecl(ASTContext &C, EmptyShell Empty) 3130 : UsingShadowDecl(ConstructorUsingShadow, C, Empty), 3131 NominatedBaseClassShadowDecl(), ConstructedBaseClassShadowDecl(), 3132 IsVirtual(false) {} 3133 3134 public: 3135 static ConstructorUsingShadowDecl *Create(ASTContext &C, DeclContext *DC, 3136 SourceLocation Loc, 3137 UsingDecl *Using, NamedDecl *Target, 3138 bool IsVirtual); 3139 static ConstructorUsingShadowDecl *CreateDeserialized(ASTContext &C, 3140 unsigned ID); 3141 3142 /// Returns the parent of this using shadow declaration, which 3143 /// is the class in which this is declared. 3144 //@{ 3145 const CXXRecordDecl *getParent() const { 3146 return cast<CXXRecordDecl>(getDeclContext()); 3147 } 3148 CXXRecordDecl *getParent() { 3149 return cast<CXXRecordDecl>(getDeclContext()); 3150 } 3151 //@} 3152 3153 /// \brief Get the inheriting constructor declaration for the direct base 3154 /// class from which this using shadow declaration was inherited, if there is 3155 /// one. This can be different for each redeclaration of the same shadow decl. 3156 ConstructorUsingShadowDecl *getNominatedBaseClassShadowDecl() const { 3157 return NominatedBaseClassShadowDecl; 3158 } 3159 3160 /// \brief Get the inheriting constructor declaration for the base class 3161 /// for which we don't have an explicit initializer, if there is one. 3162 ConstructorUsingShadowDecl *getConstructedBaseClassShadowDecl() const { 3163 return ConstructedBaseClassShadowDecl; 3164 } 3165 3166 /// \brief Get the base class that was named in the using declaration. This 3167 /// can be different for each redeclaration of this same shadow decl. 3168 CXXRecordDecl *getNominatedBaseClass() const; 3169 3170 /// \brief Get the base class whose constructor or constructor shadow 3171 /// declaration is passed the constructor arguments. 3172 CXXRecordDecl *getConstructedBaseClass() const { 3173 return cast<CXXRecordDecl>((ConstructedBaseClassShadowDecl 3174 ? ConstructedBaseClassShadowDecl 3175 : getTargetDecl()) 3176 ->getDeclContext()); 3177 } 3178 3179 /// \brief Returns \c true if the constructed base class is a virtual base 3180 /// class subobject of this declaration's class. 3181 bool constructsVirtualBase() const { 3182 return IsVirtual; 3183 } 3184 3185 /// \brief Get the constructor or constructor template in the derived class 3186 /// correspnding to this using shadow declaration, if it has been implicitly 3187 /// declared already. 3188 CXXConstructorDecl *getConstructor() const; 3189 void setConstructor(NamedDecl *Ctor); 3190 3191 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3192 static bool classofKind(Kind K) { return K == ConstructorUsingShadow; } 3193 3194 friend class ASTDeclReader; 3195 friend class ASTDeclWriter; 3196 }; 3197 3198 /// \brief Represents a C++ using-declaration. 3199 /// 3200 /// For example: 3201 /// \code 3202 /// using someNameSpace::someIdentifier; 3203 /// \endcode 3204 class UsingDecl : public NamedDecl, public Mergeable<UsingDecl> { 3205 void anchor() override; 3206 3207 /// \brief The source location of the 'using' keyword itself. 3208 SourceLocation UsingLocation; 3209 3210 /// \brief The nested-name-specifier that precedes the name. 3211 NestedNameSpecifierLoc QualifierLoc; 3212 3213 /// \brief Provides source/type location info for the declaration name 3214 /// embedded in the ValueDecl base class. 3215 DeclarationNameLoc DNLoc; 3216 3217 /// \brief The first shadow declaration of the shadow decl chain associated 3218 /// with this using declaration. 3219 /// 3220 /// The bool member of the pair store whether this decl has the \c typename 3221 /// keyword. 3222 llvm::PointerIntPair<UsingShadowDecl *, 1, bool> FirstUsingShadow; 3223 3224 UsingDecl(DeclContext *DC, SourceLocation UL, 3225 NestedNameSpecifierLoc QualifierLoc, 3226 const DeclarationNameInfo &NameInfo, bool HasTypenameKeyword) 3227 : NamedDecl(Using, DC, NameInfo.getLoc(), NameInfo.getName()), 3228 UsingLocation(UL), QualifierLoc(QualifierLoc), 3229 DNLoc(NameInfo.getInfo()), FirstUsingShadow(nullptr, HasTypenameKeyword) { 3230 } 3231 3232 public: 3233 /// \brief Return the source location of the 'using' keyword. 3234 SourceLocation getUsingLoc() const { return UsingLocation; } 3235 3236 /// \brief Set the source location of the 'using' keyword. 3237 void setUsingLoc(SourceLocation L) { UsingLocation = L; } 3238 3239 /// \brief Retrieve the nested-name-specifier that qualifies the name, 3240 /// with source-location information. 3241 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3242 3243 /// \brief Retrieve the nested-name-specifier that qualifies the name. 3244 NestedNameSpecifier *getQualifier() const { 3245 return QualifierLoc.getNestedNameSpecifier(); 3246 } 3247 3248 DeclarationNameInfo getNameInfo() const { 3249 return DeclarationNameInfo(getDeclName(), getLocation(), DNLoc); 3250 } 3251 3252 /// \brief Return true if it is a C++03 access declaration (no 'using'). 3253 bool isAccessDeclaration() const { return UsingLocation.isInvalid(); } 3254 3255 /// \brief Return true if the using declaration has 'typename'. 3256 bool hasTypename() const { return FirstUsingShadow.getInt(); } 3257 3258 /// \brief Sets whether the using declaration has 'typename'. 3259 void setTypename(bool TN) { FirstUsingShadow.setInt(TN); } 3260 3261 /// \brief Iterates through the using shadow declarations associated with 3262 /// this using declaration. 3263 class shadow_iterator { 3264 /// \brief The current using shadow declaration. 3265 UsingShadowDecl *Current; 3266 3267 public: 3268 typedef UsingShadowDecl* value_type; 3269 typedef UsingShadowDecl* reference; 3270 typedef UsingShadowDecl* pointer; 3271 typedef std::forward_iterator_tag iterator_category; 3272 typedef std::ptrdiff_t difference_type; 3273 3274 shadow_iterator() : Current(nullptr) { } 3275 explicit shadow_iterator(UsingShadowDecl *C) : Current(C) { } 3276 3277 reference operator*() const { return Current; } 3278 pointer operator->() const { return Current; } 3279 3280 shadow_iterator& operator++() { 3281 Current = Current->getNextUsingShadowDecl(); 3282 return *this; 3283 } 3284 3285 shadow_iterator operator++(int) { 3286 shadow_iterator tmp(*this); 3287 ++(*this); 3288 return tmp; 3289 } 3290 3291 friend bool operator==(shadow_iterator x, shadow_iterator y) { 3292 return x.Current == y.Current; 3293 } 3294 friend bool operator!=(shadow_iterator x, shadow_iterator y) { 3295 return x.Current != y.Current; 3296 } 3297 }; 3298 3299 typedef llvm::iterator_range<shadow_iterator> shadow_range; 3300 3301 shadow_range shadows() const { 3302 return shadow_range(shadow_begin(), shadow_end()); 3303 } 3304 shadow_iterator shadow_begin() const { 3305 return shadow_iterator(FirstUsingShadow.getPointer()); 3306 } 3307 shadow_iterator shadow_end() const { return shadow_iterator(); } 3308 3309 /// \brief Return the number of shadowed declarations associated with this 3310 /// using declaration. 3311 unsigned shadow_size() const { 3312 return std::distance(shadow_begin(), shadow_end()); 3313 } 3314 3315 void addShadowDecl(UsingShadowDecl *S); 3316 void removeShadowDecl(UsingShadowDecl *S); 3317 3318 static UsingDecl *Create(ASTContext &C, DeclContext *DC, 3319 SourceLocation UsingL, 3320 NestedNameSpecifierLoc QualifierLoc, 3321 const DeclarationNameInfo &NameInfo, 3322 bool HasTypenameKeyword); 3323 3324 static UsingDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3325 3326 SourceRange getSourceRange() const override LLVM_READONLY; 3327 3328 /// Retrieves the canonical declaration of this declaration. 3329 UsingDecl *getCanonicalDecl() override { return getFirstDecl(); } 3330 const UsingDecl *getCanonicalDecl() const { return getFirstDecl(); } 3331 3332 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3333 static bool classofKind(Kind K) { return K == Using; } 3334 3335 friend class ASTDeclReader; 3336 friend class ASTDeclWriter; 3337 }; 3338 3339 /// Represents a pack of using declarations that a single 3340 /// using-declarator pack-expanded into. 3341 /// 3342 /// \code 3343 /// template<typename ...T> struct X : T... { 3344 /// using T::operator()...; 3345 /// using T::operator T...; 3346 /// }; 3347 /// \endcode 3348 /// 3349 /// In the second case above, the UsingPackDecl will have the name 3350 /// 'operator T' (which contains an unexpanded pack), but the individual 3351 /// UsingDecls and UsingShadowDecls will have more reasonable names. 3352 class UsingPackDecl final 3353 : public NamedDecl, public Mergeable<UsingPackDecl>, 3354 private llvm::TrailingObjects<UsingPackDecl, NamedDecl *> { 3355 void anchor() override; 3356 3357 /// The UnresolvedUsingValueDecl or UnresolvedUsingTypenameDecl from 3358 /// which this waas instantiated. 3359 NamedDecl *InstantiatedFrom; 3360 3361 /// The number of using-declarations created by this pack expansion. 3362 unsigned NumExpansions; 3363 3364 UsingPackDecl(DeclContext *DC, NamedDecl *InstantiatedFrom, 3365 ArrayRef<NamedDecl *> UsingDecls) 3366 : NamedDecl(UsingPack, DC, 3367 InstantiatedFrom ? InstantiatedFrom->getLocation() 3368 : SourceLocation(), 3369 InstantiatedFrom ? InstantiatedFrom->getDeclName() 3370 : DeclarationName()), 3371 InstantiatedFrom(InstantiatedFrom), NumExpansions(UsingDecls.size()) { 3372 std::uninitialized_copy(UsingDecls.begin(), UsingDecls.end(), 3373 getTrailingObjects<NamedDecl *>()); 3374 } 3375 3376 public: 3377 /// Get the using declaration from which this was instantiated. This will 3378 /// always be an UnresolvedUsingValueDecl or an UnresolvedUsingTypenameDecl 3379 /// that is a pack expansion. 3380 NamedDecl *getInstantiatedFromUsingDecl() const { return InstantiatedFrom; } 3381 3382 /// Get the set of using declarations that this pack expanded into. Note that 3383 /// some of these may still be unresolved. 3384 ArrayRef<NamedDecl *> expansions() const { 3385 return llvm::makeArrayRef(getTrailingObjects<NamedDecl *>(), NumExpansions); 3386 } 3387 3388 static UsingPackDecl *Create(ASTContext &C, DeclContext *DC, 3389 NamedDecl *InstantiatedFrom, 3390 ArrayRef<NamedDecl *> UsingDecls); 3391 3392 static UsingPackDecl *CreateDeserialized(ASTContext &C, unsigned ID, 3393 unsigned NumExpansions); 3394 3395 SourceRange getSourceRange() const override LLVM_READONLY { 3396 return InstantiatedFrom->getSourceRange(); 3397 } 3398 3399 UsingPackDecl *getCanonicalDecl() override { return getFirstDecl(); } 3400 const UsingPackDecl *getCanonicalDecl() const { return getFirstDecl(); } 3401 3402 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3403 static bool classofKind(Kind K) { return K == UsingPack; } 3404 3405 friend class ASTDeclReader; 3406 friend class ASTDeclWriter; 3407 friend TrailingObjects; 3408 }; 3409 3410 /// \brief Represents a dependent using declaration which was not marked with 3411 /// \c typename. 3412 /// 3413 /// Unlike non-dependent using declarations, these *only* bring through 3414 /// non-types; otherwise they would break two-phase lookup. 3415 /// 3416 /// \code 3417 /// template \<class T> class A : public Base<T> { 3418 /// using Base<T>::foo; 3419 /// }; 3420 /// \endcode 3421 class UnresolvedUsingValueDecl : public ValueDecl, 3422 public Mergeable<UnresolvedUsingValueDecl> { 3423 void anchor() override; 3424 3425 /// \brief The source location of the 'using' keyword 3426 SourceLocation UsingLocation; 3427 3428 /// \brief If this is a pack expansion, the location of the '...'. 3429 SourceLocation EllipsisLoc; 3430 3431 /// \brief The nested-name-specifier that precedes the name. 3432 NestedNameSpecifierLoc QualifierLoc; 3433 3434 /// \brief Provides source/type location info for the declaration name 3435 /// embedded in the ValueDecl base class. 3436 DeclarationNameLoc DNLoc; 3437 3438 UnresolvedUsingValueDecl(DeclContext *DC, QualType Ty, 3439 SourceLocation UsingLoc, 3440 NestedNameSpecifierLoc QualifierLoc, 3441 const DeclarationNameInfo &NameInfo, 3442 SourceLocation EllipsisLoc) 3443 : ValueDecl(UnresolvedUsingValue, DC, 3444 NameInfo.getLoc(), NameInfo.getName(), Ty), 3445 UsingLocation(UsingLoc), EllipsisLoc(EllipsisLoc), 3446 QualifierLoc(QualifierLoc), DNLoc(NameInfo.getInfo()) 3447 { } 3448 3449 public: 3450 /// \brief Returns the source location of the 'using' keyword. 3451 SourceLocation getUsingLoc() const { return UsingLocation; } 3452 3453 /// \brief Set the source location of the 'using' keyword. 3454 void setUsingLoc(SourceLocation L) { UsingLocation = L; } 3455 3456 /// \brief Return true if it is a C++03 access declaration (no 'using'). 3457 bool isAccessDeclaration() const { return UsingLocation.isInvalid(); } 3458 3459 /// \brief Retrieve the nested-name-specifier that qualifies the name, 3460 /// with source-location information. 3461 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3462 3463 /// \brief Retrieve the nested-name-specifier that qualifies the name. 3464 NestedNameSpecifier *getQualifier() const { 3465 return QualifierLoc.getNestedNameSpecifier(); 3466 } 3467 3468 DeclarationNameInfo getNameInfo() const { 3469 return DeclarationNameInfo(getDeclName(), getLocation(), DNLoc); 3470 } 3471 3472 /// \brief Determine whether this is a pack expansion. 3473 bool isPackExpansion() const { 3474 return EllipsisLoc.isValid(); 3475 } 3476 3477 /// \brief Get the location of the ellipsis if this is a pack expansion. 3478 SourceLocation getEllipsisLoc() const { 3479 return EllipsisLoc; 3480 } 3481 3482 static UnresolvedUsingValueDecl * 3483 Create(ASTContext &C, DeclContext *DC, SourceLocation UsingLoc, 3484 NestedNameSpecifierLoc QualifierLoc, 3485 const DeclarationNameInfo &NameInfo, SourceLocation EllipsisLoc); 3486 3487 static UnresolvedUsingValueDecl * 3488 CreateDeserialized(ASTContext &C, unsigned ID); 3489 3490 SourceRange getSourceRange() const override LLVM_READONLY; 3491 3492 /// Retrieves the canonical declaration of this declaration. 3493 UnresolvedUsingValueDecl *getCanonicalDecl() override { 3494 return getFirstDecl(); 3495 } 3496 const UnresolvedUsingValueDecl *getCanonicalDecl() const { 3497 return getFirstDecl(); 3498 } 3499 3500 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3501 static bool classofKind(Kind K) { return K == UnresolvedUsingValue; } 3502 3503 friend class ASTDeclReader; 3504 friend class ASTDeclWriter; 3505 }; 3506 3507 /// \brief Represents a dependent using declaration which was marked with 3508 /// \c typename. 3509 /// 3510 /// \code 3511 /// template \<class T> class A : public Base<T> { 3512 /// using typename Base<T>::foo; 3513 /// }; 3514 /// \endcode 3515 /// 3516 /// The type associated with an unresolved using typename decl is 3517 /// currently always a typename type. 3518 class UnresolvedUsingTypenameDecl 3519 : public TypeDecl, 3520 public Mergeable<UnresolvedUsingTypenameDecl> { 3521 void anchor() override; 3522 3523 /// \brief The source location of the 'typename' keyword 3524 SourceLocation TypenameLocation; 3525 3526 /// \brief If this is a pack expansion, the location of the '...'. 3527 SourceLocation EllipsisLoc; 3528 3529 /// \brief The nested-name-specifier that precedes the name. 3530 NestedNameSpecifierLoc QualifierLoc; 3531 3532 UnresolvedUsingTypenameDecl(DeclContext *DC, SourceLocation UsingLoc, 3533 SourceLocation TypenameLoc, 3534 NestedNameSpecifierLoc QualifierLoc, 3535 SourceLocation TargetNameLoc, 3536 IdentifierInfo *TargetName, 3537 SourceLocation EllipsisLoc) 3538 : TypeDecl(UnresolvedUsingTypename, DC, TargetNameLoc, TargetName, 3539 UsingLoc), 3540 TypenameLocation(TypenameLoc), EllipsisLoc(EllipsisLoc), 3541 QualifierLoc(QualifierLoc) { } 3542 3543 friend class ASTDeclReader; 3544 3545 public: 3546 /// \brief Returns the source location of the 'using' keyword. 3547 SourceLocation getUsingLoc() const { return getLocStart(); } 3548 3549 /// \brief Returns the source location of the 'typename' keyword. 3550 SourceLocation getTypenameLoc() const { return TypenameLocation; } 3551 3552 /// \brief Retrieve the nested-name-specifier that qualifies the name, 3553 /// with source-location information. 3554 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3555 3556 /// \brief Retrieve the nested-name-specifier that qualifies the name. 3557 NestedNameSpecifier *getQualifier() const { 3558 return QualifierLoc.getNestedNameSpecifier(); 3559 } 3560 3561 DeclarationNameInfo getNameInfo() const { 3562 return DeclarationNameInfo(getDeclName(), getLocation()); 3563 } 3564 3565 /// \brief Determine whether this is a pack expansion. 3566 bool isPackExpansion() const { 3567 return EllipsisLoc.isValid(); 3568 } 3569 3570 /// \brief Get the location of the ellipsis if this is a pack expansion. 3571 SourceLocation getEllipsisLoc() const { 3572 return EllipsisLoc; 3573 } 3574 3575 static UnresolvedUsingTypenameDecl * 3576 Create(ASTContext &C, DeclContext *DC, SourceLocation UsingLoc, 3577 SourceLocation TypenameLoc, NestedNameSpecifierLoc QualifierLoc, 3578 SourceLocation TargetNameLoc, DeclarationName TargetName, 3579 SourceLocation EllipsisLoc); 3580 3581 static UnresolvedUsingTypenameDecl * 3582 CreateDeserialized(ASTContext &C, unsigned ID); 3583 3584 /// Retrieves the canonical declaration of this declaration. 3585 UnresolvedUsingTypenameDecl *getCanonicalDecl() override { 3586 return getFirstDecl(); 3587 } 3588 const UnresolvedUsingTypenameDecl *getCanonicalDecl() const { 3589 return getFirstDecl(); 3590 } 3591 3592 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3593 static bool classofKind(Kind K) { return K == UnresolvedUsingTypename; } 3594 }; 3595 3596 /// \brief Represents a C++11 static_assert declaration. 3597 class StaticAssertDecl : public Decl { 3598 virtual void anchor(); 3599 llvm::PointerIntPair<Expr *, 1, bool> AssertExprAndFailed; 3600 StringLiteral *Message; 3601 SourceLocation RParenLoc; 3602 3603 StaticAssertDecl(DeclContext *DC, SourceLocation StaticAssertLoc, 3604 Expr *AssertExpr, StringLiteral *Message, 3605 SourceLocation RParenLoc, bool Failed) 3606 : Decl(StaticAssert, DC, StaticAssertLoc), 3607 AssertExprAndFailed(AssertExpr, Failed), Message(Message), 3608 RParenLoc(RParenLoc) { } 3609 3610 public: 3611 static StaticAssertDecl *Create(ASTContext &C, DeclContext *DC, 3612 SourceLocation StaticAssertLoc, 3613 Expr *AssertExpr, StringLiteral *Message, 3614 SourceLocation RParenLoc, bool Failed); 3615 static StaticAssertDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3616 3617 Expr *getAssertExpr() { return AssertExprAndFailed.getPointer(); } 3618 const Expr *getAssertExpr() const { return AssertExprAndFailed.getPointer(); } 3619 3620 StringLiteral *getMessage() { return Message; } 3621 const StringLiteral *getMessage() const { return Message; } 3622 3623 bool isFailed() const { return AssertExprAndFailed.getInt(); } 3624 3625 SourceLocation getRParenLoc() const { return RParenLoc; } 3626 3627 SourceRange getSourceRange() const override LLVM_READONLY { 3628 return SourceRange(getLocation(), getRParenLoc()); 3629 } 3630 3631 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3632 static bool classofKind(Kind K) { return K == StaticAssert; } 3633 3634 friend class ASTDeclReader; 3635 }; 3636 3637 /// A binding in a decomposition declaration. For instance, given: 3638 /// 3639 /// int n[3]; 3640 /// auto &[a, b, c] = n; 3641 /// 3642 /// a, b, and c are BindingDecls, whose bindings are the expressions 3643 /// x[0], x[1], and x[2] respectively, where x is the implicit 3644 /// DecompositionDecl of type 'int (&)[3]'. 3645 class BindingDecl : public ValueDecl { 3646 void anchor() override; 3647 3648 /// The binding represented by this declaration. References to this 3649 /// declaration are effectively equivalent to this expression (except 3650 /// that it is only evaluated once at the point of declaration of the 3651 /// binding). 3652 Expr *Binding; 3653 3654 BindingDecl(DeclContext *DC, SourceLocation IdLoc, IdentifierInfo *Id) 3655 : ValueDecl(Decl::Binding, DC, IdLoc, Id, QualType()), Binding(nullptr) {} 3656 3657 public: 3658 static BindingDecl *Create(ASTContext &C, DeclContext *DC, 3659 SourceLocation IdLoc, IdentifierInfo *Id); 3660 static BindingDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3661 3662 /// Get the expression to which this declaration is bound. This may be null 3663 /// in two different cases: while parsing the initializer for the 3664 /// decomposition declaration, and when the initializer is type-dependent. 3665 Expr *getBinding() const { return Binding; } 3666 3667 /// Get the variable (if any) that holds the value of evaluating the binding. 3668 /// Only present for user-defined bindings for tuple-like types. 3669 VarDecl *getHoldingVar() const; 3670 3671 /// Set the binding for this BindingDecl, along with its declared type (which 3672 /// should be a possibly-cv-qualified form of the type of the binding, or a 3673 /// reference to such a type). 3674 void setBinding(QualType DeclaredType, Expr *Binding) { 3675 setType(DeclaredType); 3676 this->Binding = Binding; 3677 } 3678 3679 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3680 static bool classofKind(Kind K) { return K == Decl::Binding; } 3681 3682 friend class ASTDeclReader; 3683 }; 3684 3685 /// A decomposition declaration. For instance, given: 3686 /// 3687 /// int n[3]; 3688 /// auto &[a, b, c] = n; 3689 /// 3690 /// the second line declares a DecompositionDecl of type 'int (&)[3]', and 3691 /// three BindingDecls (named a, b, and c). An instance of this class is always 3692 /// unnamed, but behaves in almost all other respects like a VarDecl. 3693 class DecompositionDecl final 3694 : public VarDecl, 3695 private llvm::TrailingObjects<DecompositionDecl, BindingDecl *> { 3696 void anchor() override; 3697 3698 /// The number of BindingDecl*s following this object. 3699 unsigned NumBindings; 3700 3701 DecompositionDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, 3702 SourceLocation LSquareLoc, QualType T, 3703 TypeSourceInfo *TInfo, StorageClass SC, 3704 ArrayRef<BindingDecl *> Bindings) 3705 : VarDecl(Decomposition, C, DC, StartLoc, LSquareLoc, nullptr, T, TInfo, 3706 SC), 3707 NumBindings(Bindings.size()) { 3708 std::uninitialized_copy(Bindings.begin(), Bindings.end(), 3709 getTrailingObjects<BindingDecl *>()); 3710 } 3711 3712 public: 3713 static DecompositionDecl *Create(ASTContext &C, DeclContext *DC, 3714 SourceLocation StartLoc, 3715 SourceLocation LSquareLoc, 3716 QualType T, TypeSourceInfo *TInfo, 3717 StorageClass S, 3718 ArrayRef<BindingDecl *> Bindings); 3719 static DecompositionDecl *CreateDeserialized(ASTContext &C, unsigned ID, 3720 unsigned NumBindings); 3721 3722 ArrayRef<BindingDecl *> bindings() const { 3723 return llvm::makeArrayRef(getTrailingObjects<BindingDecl *>(), NumBindings); 3724 } 3725 3726 void printName(raw_ostream &os) const override; 3727 3728 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3729 static bool classofKind(Kind K) { return K == Decomposition; } 3730 3731 friend TrailingObjects; 3732 friend class ASTDeclReader; 3733 }; 3734 3735 /// An instance of this class represents the declaration of a property 3736 /// member. This is a Microsoft extension to C++, first introduced in 3737 /// Visual Studio .NET 2003 as a parallel to similar features in C# 3738 /// and Managed C++. 3739 /// 3740 /// A property must always be a non-static class member. 3741 /// 3742 /// A property member superficially resembles a non-static data 3743 /// member, except preceded by a property attribute: 3744 /// __declspec(property(get=GetX, put=PutX)) int x; 3745 /// Either (but not both) of the 'get' and 'put' names may be omitted. 3746 /// 3747 /// A reference to a property is always an lvalue. If the lvalue 3748 /// undergoes lvalue-to-rvalue conversion, then a getter name is 3749 /// required, and that member is called with no arguments. 3750 /// If the lvalue is assigned into, then a setter name is required, 3751 /// and that member is called with one argument, the value assigned. 3752 /// Both operations are potentially overloaded. Compound assignments 3753 /// are permitted, as are the increment and decrement operators. 3754 /// 3755 /// The getter and putter methods are permitted to be overloaded, 3756 /// although their return and parameter types are subject to certain 3757 /// restrictions according to the type of the property. 3758 /// 3759 /// A property declared using an incomplete array type may 3760 /// additionally be subscripted, adding extra parameters to the getter 3761 /// and putter methods. 3762 class MSPropertyDecl : public DeclaratorDecl { 3763 IdentifierInfo *GetterId, *SetterId; 3764 3765 MSPropertyDecl(DeclContext *DC, SourceLocation L, DeclarationName N, 3766 QualType T, TypeSourceInfo *TInfo, SourceLocation StartL, 3767 IdentifierInfo *Getter, IdentifierInfo *Setter) 3768 : DeclaratorDecl(MSProperty, DC, L, N, T, TInfo, StartL), 3769 GetterId(Getter), SetterId(Setter) {} 3770 3771 public: 3772 static MSPropertyDecl *Create(ASTContext &C, DeclContext *DC, 3773 SourceLocation L, DeclarationName N, QualType T, 3774 TypeSourceInfo *TInfo, SourceLocation StartL, 3775 IdentifierInfo *Getter, IdentifierInfo *Setter); 3776 static MSPropertyDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3777 3778 static bool classof(const Decl *D) { return D->getKind() == MSProperty; } 3779 3780 bool hasGetter() const { return GetterId != nullptr; } 3781 IdentifierInfo* getGetterId() const { return GetterId; } 3782 bool hasSetter() const { return SetterId != nullptr; } 3783 IdentifierInfo* getSetterId() const { return SetterId; } 3784 3785 friend class ASTDeclReader; 3786 }; 3787 3788 /// Insertion operator for diagnostics. This allows sending an AccessSpecifier 3789 /// into a diagnostic with <<. 3790 const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB, 3791 AccessSpecifier AS); 3792 3793 const PartialDiagnostic &operator<<(const PartialDiagnostic &DB, 3794 AccessSpecifier AS); 3795 3796 } // end namespace clang 3797 3798 #endif 3799