1 //===- DeclCXX.h - Classes for representing C++ declarations --*- C++ -*-=====// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 /// \file 10 /// Defines the C++ Decl subclasses, other than those for templates 11 /// (found in DeclTemplate.h) and friends (in DeclFriend.h). 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_CLANG_AST_DECLCXX_H 16 #define LLVM_CLANG_AST_DECLCXX_H 17 18 #include "clang/AST/ASTUnresolvedSet.h" 19 #include "clang/AST/Decl.h" 20 #include "clang/AST/DeclBase.h" 21 #include "clang/AST/DeclarationName.h" 22 #include "clang/AST/Expr.h" 23 #include "clang/AST/ExternalASTSource.h" 24 #include "clang/AST/LambdaCapture.h" 25 #include "clang/AST/NestedNameSpecifier.h" 26 #include "clang/AST/Redeclarable.h" 27 #include "clang/AST/Stmt.h" 28 #include "clang/AST/Type.h" 29 #include "clang/AST/TypeLoc.h" 30 #include "clang/AST/UnresolvedSet.h" 31 #include "clang/Basic/LLVM.h" 32 #include "clang/Basic/Lambda.h" 33 #include "clang/Basic/LangOptions.h" 34 #include "clang/Basic/OperatorKinds.h" 35 #include "clang/Basic/SourceLocation.h" 36 #include "clang/Basic/Specifiers.h" 37 #include "llvm/ADT/ArrayRef.h" 38 #include "llvm/ADT/DenseMap.h" 39 #include "llvm/ADT/PointerIntPair.h" 40 #include "llvm/ADT/PointerUnion.h" 41 #include "llvm/ADT/STLExtras.h" 42 #include "llvm/ADT/TinyPtrVector.h" 43 #include "llvm/ADT/iterator_range.h" 44 #include "llvm/Support/Casting.h" 45 #include "llvm/Support/Compiler.h" 46 #include "llvm/Support/PointerLikeTypeTraits.h" 47 #include "llvm/Support/TrailingObjects.h" 48 #include <cassert> 49 #include <cstddef> 50 #include <iterator> 51 #include <memory> 52 #include <vector> 53 54 namespace clang { 55 56 class ASTContext; 57 class ClassTemplateDecl; 58 class ConstructorUsingShadowDecl; 59 class CXXBasePath; 60 class CXXBasePaths; 61 class CXXConstructorDecl; 62 class CXXDestructorDecl; 63 class CXXFinalOverriderMap; 64 class CXXIndirectPrimaryBaseSet; 65 class CXXMethodDecl; 66 class DecompositionDecl; 67 class FriendDecl; 68 class FunctionTemplateDecl; 69 class IdentifierInfo; 70 class MemberSpecializationInfo; 71 class BaseUsingDecl; 72 class TemplateDecl; 73 class TemplateParameterList; 74 class UsingDecl; 75 76 /// Represents an access specifier followed by colon ':'. 77 /// 78 /// An objects of this class represents sugar for the syntactic occurrence 79 /// of an access specifier followed by a colon in the list of member 80 /// specifiers of a C++ class definition. 81 /// 82 /// Note that they do not represent other uses of access specifiers, 83 /// such as those occurring in a list of base specifiers. 84 /// Also note that this class has nothing to do with so-called 85 /// "access declarations" (C++98 11.3 [class.access.dcl]). 86 class AccessSpecDecl : public Decl { 87 /// The location of the ':'. 88 SourceLocation ColonLoc; 89 90 AccessSpecDecl(AccessSpecifier AS, DeclContext *DC, 91 SourceLocation ASLoc, SourceLocation ColonLoc) 92 : Decl(AccessSpec, DC, ASLoc), ColonLoc(ColonLoc) { 93 setAccess(AS); 94 } 95 96 AccessSpecDecl(EmptyShell Empty) : Decl(AccessSpec, Empty) {} 97 98 virtual void anchor(); 99 100 public: 101 /// The location of the access specifier. 102 SourceLocation getAccessSpecifierLoc() const { return getLocation(); } 103 104 /// Sets the location of the access specifier. 105 void setAccessSpecifierLoc(SourceLocation ASLoc) { setLocation(ASLoc); } 106 107 /// The location of the colon following the access specifier. 108 SourceLocation getColonLoc() const { return ColonLoc; } 109 110 /// Sets the location of the colon. 111 void setColonLoc(SourceLocation CLoc) { ColonLoc = CLoc; } 112 113 SourceRange getSourceRange() const override LLVM_READONLY { 114 return SourceRange(getAccessSpecifierLoc(), getColonLoc()); 115 } 116 117 static AccessSpecDecl *Create(ASTContext &C, AccessSpecifier AS, 118 DeclContext *DC, SourceLocation ASLoc, 119 SourceLocation ColonLoc) { 120 return new (C, DC) AccessSpecDecl(AS, DC, ASLoc, ColonLoc); 121 } 122 123 static AccessSpecDecl *CreateDeserialized(ASTContext &C, unsigned ID); 124 125 // Implement isa/cast/dyncast/etc. 126 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 127 static bool classofKind(Kind K) { return K == AccessSpec; } 128 }; 129 130 /// Represents a base class of a C++ class. 131 /// 132 /// Each CXXBaseSpecifier represents a single, direct base class (or 133 /// struct) of a C++ class (or struct). It specifies the type of that 134 /// base class, whether it is a virtual or non-virtual base, and what 135 /// level of access (public, protected, private) is used for the 136 /// derivation. For example: 137 /// 138 /// \code 139 /// class A { }; 140 /// class B { }; 141 /// class C : public virtual A, protected B { }; 142 /// \endcode 143 /// 144 /// In this code, C will have two CXXBaseSpecifiers, one for "public 145 /// virtual A" and the other for "protected B". 146 class CXXBaseSpecifier { 147 /// The source code range that covers the full base 148 /// specifier, including the "virtual" (if present) and access 149 /// specifier (if present). 150 SourceRange Range; 151 152 /// The source location of the ellipsis, if this is a pack 153 /// expansion. 154 SourceLocation EllipsisLoc; 155 156 /// Whether this is a virtual base class or not. 157 unsigned Virtual : 1; 158 159 /// Whether this is the base of a class (true) or of a struct (false). 160 /// 161 /// This determines the mapping from the access specifier as written in the 162 /// source code to the access specifier used for semantic analysis. 163 unsigned BaseOfClass : 1; 164 165 /// Access specifier as written in the source code (may be AS_none). 166 /// 167 /// The actual type of data stored here is an AccessSpecifier, but we use 168 /// "unsigned" here to work around a VC++ bug. 169 unsigned Access : 2; 170 171 /// Whether the class contains a using declaration 172 /// to inherit the named class's constructors. 173 unsigned InheritConstructors : 1; 174 175 /// The type of the base class. 176 /// 177 /// This will be a class or struct (or a typedef of such). The source code 178 /// range does not include the \c virtual or the access specifier. 179 TypeSourceInfo *BaseTypeInfo; 180 181 public: 182 CXXBaseSpecifier() = default; 183 CXXBaseSpecifier(SourceRange R, bool V, bool BC, AccessSpecifier A, 184 TypeSourceInfo *TInfo, SourceLocation EllipsisLoc) 185 : Range(R), EllipsisLoc(EllipsisLoc), Virtual(V), BaseOfClass(BC), 186 Access(A), InheritConstructors(false), BaseTypeInfo(TInfo) {} 187 188 /// Retrieves the source range that contains the entire base specifier. 189 SourceRange getSourceRange() const LLVM_READONLY { return Range; } 190 SourceLocation getBeginLoc() const LLVM_READONLY { return Range.getBegin(); } 191 SourceLocation getEndLoc() const LLVM_READONLY { return Range.getEnd(); } 192 193 /// Get the location at which the base class type was written. 194 SourceLocation getBaseTypeLoc() const LLVM_READONLY { 195 return BaseTypeInfo->getTypeLoc().getBeginLoc(); 196 } 197 198 /// Determines whether the base class is a virtual base class (or not). 199 bool isVirtual() const { return Virtual; } 200 201 /// Determine whether this base class is a base of a class declared 202 /// with the 'class' keyword (vs. one declared with the 'struct' keyword). 203 bool isBaseOfClass() const { return BaseOfClass; } 204 205 /// Determine whether this base specifier is a pack expansion. 206 bool isPackExpansion() const { return EllipsisLoc.isValid(); } 207 208 /// Determine whether this base class's constructors get inherited. 209 bool getInheritConstructors() const { return InheritConstructors; } 210 211 /// Set that this base class's constructors should be inherited. 212 void setInheritConstructors(bool Inherit = true) { 213 InheritConstructors = Inherit; 214 } 215 216 /// For a pack expansion, determine the location of the ellipsis. 217 SourceLocation getEllipsisLoc() const { 218 return EllipsisLoc; 219 } 220 221 /// Returns the access specifier for this base specifier. 222 /// 223 /// This is the actual base specifier as used for semantic analysis, so 224 /// the result can never be AS_none. To retrieve the access specifier as 225 /// written in the source code, use getAccessSpecifierAsWritten(). 226 AccessSpecifier getAccessSpecifier() const { 227 if ((AccessSpecifier)Access == AS_none) 228 return BaseOfClass? AS_private : AS_public; 229 else 230 return (AccessSpecifier)Access; 231 } 232 233 /// Retrieves the access specifier as written in the source code 234 /// (which may mean that no access specifier was explicitly written). 235 /// 236 /// Use getAccessSpecifier() to retrieve the access specifier for use in 237 /// semantic analysis. 238 AccessSpecifier getAccessSpecifierAsWritten() const { 239 return (AccessSpecifier)Access; 240 } 241 242 /// Retrieves the type of the base class. 243 /// 244 /// This type will always be an unqualified class type. 245 QualType getType() const { 246 return BaseTypeInfo->getType().getUnqualifiedType(); 247 } 248 249 /// Retrieves the type and source location of the base class. 250 TypeSourceInfo *getTypeSourceInfo() const { return BaseTypeInfo; } 251 }; 252 253 /// Represents a C++ struct/union/class. 254 class CXXRecordDecl : public RecordDecl { 255 friend class ASTDeclReader; 256 friend class ASTDeclWriter; 257 friend class ASTNodeImporter; 258 friend class ASTReader; 259 friend class ASTRecordWriter; 260 friend class ASTWriter; 261 friend class DeclContext; 262 friend class LambdaExpr; 263 friend class ODRDiagsEmitter; 264 265 friend void FunctionDecl::setPure(bool); 266 friend void TagDecl::startDefinition(); 267 268 /// Values used in DefinitionData fields to represent special members. 269 enum SpecialMemberFlags { 270 SMF_DefaultConstructor = 0x1, 271 SMF_CopyConstructor = 0x2, 272 SMF_MoveConstructor = 0x4, 273 SMF_CopyAssignment = 0x8, 274 SMF_MoveAssignment = 0x10, 275 SMF_Destructor = 0x20, 276 SMF_All = 0x3f 277 }; 278 279 public: 280 enum LambdaDependencyKind { 281 LDK_Unknown = 0, 282 LDK_AlwaysDependent, 283 LDK_NeverDependent, 284 }; 285 286 private: 287 struct DefinitionData { 288 #define FIELD(Name, Width, Merge) \ 289 unsigned Name : Width; 290 #include "CXXRecordDeclDefinitionBits.def" 291 292 /// Whether this class describes a C++ lambda. 293 unsigned IsLambda : 1; 294 295 /// Whether we are currently parsing base specifiers. 296 unsigned IsParsingBaseSpecifiers : 1; 297 298 /// True when visible conversion functions are already computed 299 /// and are available. 300 unsigned ComputedVisibleConversions : 1; 301 302 unsigned HasODRHash : 1; 303 304 /// A hash of parts of the class to help in ODR checking. 305 unsigned ODRHash = 0; 306 307 /// The number of base class specifiers in Bases. 308 unsigned NumBases = 0; 309 310 /// The number of virtual base class specifiers in VBases. 311 unsigned NumVBases = 0; 312 313 /// Base classes of this class. 314 /// 315 /// FIXME: This is wasted space for a union. 316 LazyCXXBaseSpecifiersPtr Bases; 317 318 /// direct and indirect virtual base classes of this class. 319 LazyCXXBaseSpecifiersPtr VBases; 320 321 /// The conversion functions of this C++ class (but not its 322 /// inherited conversion functions). 323 /// 324 /// Each of the entries in this overload set is a CXXConversionDecl. 325 LazyASTUnresolvedSet Conversions; 326 327 /// The conversion functions of this C++ class and all those 328 /// inherited conversion functions that are visible in this class. 329 /// 330 /// Each of the entries in this overload set is a CXXConversionDecl or a 331 /// FunctionTemplateDecl. 332 LazyASTUnresolvedSet VisibleConversions; 333 334 /// The declaration which defines this record. 335 CXXRecordDecl *Definition; 336 337 /// The first friend declaration in this class, or null if there 338 /// aren't any. 339 /// 340 /// This is actually currently stored in reverse order. 341 LazyDeclPtr FirstFriend; 342 343 DefinitionData(CXXRecordDecl *D); 344 345 /// Retrieve the set of direct base classes. 346 CXXBaseSpecifier *getBases() const { 347 if (!Bases.isOffset()) 348 return Bases.get(nullptr); 349 return getBasesSlowCase(); 350 } 351 352 /// Retrieve the set of virtual base classes. 353 CXXBaseSpecifier *getVBases() const { 354 if (!VBases.isOffset()) 355 return VBases.get(nullptr); 356 return getVBasesSlowCase(); 357 } 358 359 ArrayRef<CXXBaseSpecifier> bases() const { 360 return llvm::ArrayRef(getBases(), NumBases); 361 } 362 363 ArrayRef<CXXBaseSpecifier> vbases() const { 364 return llvm::ArrayRef(getVBases(), NumVBases); 365 } 366 367 private: 368 CXXBaseSpecifier *getBasesSlowCase() const; 369 CXXBaseSpecifier *getVBasesSlowCase() const; 370 }; 371 372 struct DefinitionData *DefinitionData; 373 374 /// Describes a C++ closure type (generated by a lambda expression). 375 struct LambdaDefinitionData : public DefinitionData { 376 using Capture = LambdaCapture; 377 378 /// Whether this lambda is known to be dependent, even if its 379 /// context isn't dependent. 380 /// 381 /// A lambda with a non-dependent context can be dependent if it occurs 382 /// within the default argument of a function template, because the 383 /// lambda will have been created with the enclosing context as its 384 /// declaration context, rather than function. This is an unfortunate 385 /// artifact of having to parse the default arguments before. 386 unsigned DependencyKind : 2; 387 388 /// Whether this lambda is a generic lambda. 389 unsigned IsGenericLambda : 1; 390 391 /// The Default Capture. 392 unsigned CaptureDefault : 2; 393 394 /// The number of captures in this lambda is limited 2^NumCaptures. 395 unsigned NumCaptures : 15; 396 397 /// The number of explicit captures in this lambda. 398 unsigned NumExplicitCaptures : 12; 399 400 /// Has known `internal` linkage. 401 unsigned HasKnownInternalLinkage : 1; 402 403 /// The number used to indicate this lambda expression for name 404 /// mangling in the Itanium C++ ABI. 405 unsigned ManglingNumber : 31; 406 407 /// The index of this lambda within its context declaration. This is not in 408 /// general the same as the mangling number. 409 unsigned IndexInContext; 410 411 /// The declaration that provides context for this lambda, if the 412 /// actual DeclContext does not suffice. This is used for lambdas that 413 /// occur within default arguments of function parameters within the class 414 /// or within a data member initializer. 415 LazyDeclPtr ContextDecl; 416 417 /// The lists of captures, both explicit and implicit, for this 418 /// lambda. One list is provided for each merged copy of the lambda. 419 /// The first list corresponds to the canonical definition. 420 /// The destructor is registered by AddCaptureList when necessary. 421 llvm::TinyPtrVector<Capture*> Captures; 422 423 /// The type of the call method. 424 TypeSourceInfo *MethodTyInfo; 425 426 LambdaDefinitionData(CXXRecordDecl *D, TypeSourceInfo *Info, unsigned DK, 427 bool IsGeneric, LambdaCaptureDefault CaptureDefault) 428 : DefinitionData(D), DependencyKind(DK), IsGenericLambda(IsGeneric), 429 CaptureDefault(CaptureDefault), NumCaptures(0), 430 NumExplicitCaptures(0), HasKnownInternalLinkage(0), ManglingNumber(0), 431 IndexInContext(0), MethodTyInfo(Info) { 432 IsLambda = true; 433 434 // C++1z [expr.prim.lambda]p4: 435 // This class type is not an aggregate type. 436 Aggregate = false; 437 PlainOldData = false; 438 } 439 440 // Add a list of captures. 441 void AddCaptureList(ASTContext &Ctx, Capture *CaptureList); 442 }; 443 444 struct DefinitionData *dataPtr() const { 445 // Complete the redecl chain (if necessary). 446 getMostRecentDecl(); 447 return DefinitionData; 448 } 449 450 struct DefinitionData &data() const { 451 auto *DD = dataPtr(); 452 assert(DD && "queried property of class with no definition"); 453 return *DD; 454 } 455 456 struct LambdaDefinitionData &getLambdaData() const { 457 // No update required: a merged definition cannot change any lambda 458 // properties. 459 auto *DD = DefinitionData; 460 assert(DD && DD->IsLambda && "queried lambda property of non-lambda class"); 461 return static_cast<LambdaDefinitionData&>(*DD); 462 } 463 464 /// The template or declaration that this declaration 465 /// describes or was instantiated from, respectively. 466 /// 467 /// For non-templates, this value will be null. For record 468 /// declarations that describe a class template, this will be a 469 /// pointer to a ClassTemplateDecl. For member 470 /// classes of class template specializations, this will be the 471 /// MemberSpecializationInfo referring to the member class that was 472 /// instantiated or specialized. 473 llvm::PointerUnion<ClassTemplateDecl *, MemberSpecializationInfo *> 474 TemplateOrInstantiation; 475 476 /// Called from setBases and addedMember to notify the class that a 477 /// direct or virtual base class or a member of class type has been added. 478 void addedClassSubobject(CXXRecordDecl *Base); 479 480 /// Notify the class that member has been added. 481 /// 482 /// This routine helps maintain information about the class based on which 483 /// members have been added. It will be invoked by DeclContext::addDecl() 484 /// whenever a member is added to this record. 485 void addedMember(Decl *D); 486 487 void markedVirtualFunctionPure(); 488 489 /// Get the head of our list of friend declarations, possibly 490 /// deserializing the friends from an external AST source. 491 FriendDecl *getFirstFriend() const; 492 493 /// Determine whether this class has an empty base class subobject of type X 494 /// or of one of the types that might be at offset 0 within X (per the C++ 495 /// "standard layout" rules). 496 bool hasSubobjectAtOffsetZeroOfEmptyBaseType(ASTContext &Ctx, 497 const CXXRecordDecl *X); 498 499 protected: 500 CXXRecordDecl(Kind K, TagKind TK, const ASTContext &C, DeclContext *DC, 501 SourceLocation StartLoc, SourceLocation IdLoc, 502 IdentifierInfo *Id, CXXRecordDecl *PrevDecl); 503 504 public: 505 /// Iterator that traverses the base classes of a class. 506 using base_class_iterator = CXXBaseSpecifier *; 507 508 /// Iterator that traverses the base classes of a class. 509 using base_class_const_iterator = const CXXBaseSpecifier *; 510 511 CXXRecordDecl *getCanonicalDecl() override { 512 return cast<CXXRecordDecl>(RecordDecl::getCanonicalDecl()); 513 } 514 515 const CXXRecordDecl *getCanonicalDecl() const { 516 return const_cast<CXXRecordDecl*>(this)->getCanonicalDecl(); 517 } 518 519 CXXRecordDecl *getPreviousDecl() { 520 return cast_or_null<CXXRecordDecl>( 521 static_cast<RecordDecl *>(this)->getPreviousDecl()); 522 } 523 524 const CXXRecordDecl *getPreviousDecl() const { 525 return const_cast<CXXRecordDecl*>(this)->getPreviousDecl(); 526 } 527 528 CXXRecordDecl *getMostRecentDecl() { 529 return cast<CXXRecordDecl>( 530 static_cast<RecordDecl *>(this)->getMostRecentDecl()); 531 } 532 533 const CXXRecordDecl *getMostRecentDecl() const { 534 return const_cast<CXXRecordDecl*>(this)->getMostRecentDecl(); 535 } 536 537 CXXRecordDecl *getMostRecentNonInjectedDecl() { 538 CXXRecordDecl *Recent = 539 static_cast<CXXRecordDecl *>(this)->getMostRecentDecl(); 540 while (Recent->isInjectedClassName()) { 541 // FIXME: Does injected class name need to be in the redeclarations chain? 542 assert(Recent->getPreviousDecl()); 543 Recent = Recent->getPreviousDecl(); 544 } 545 return Recent; 546 } 547 548 const CXXRecordDecl *getMostRecentNonInjectedDecl() const { 549 return const_cast<CXXRecordDecl*>(this)->getMostRecentNonInjectedDecl(); 550 } 551 552 CXXRecordDecl *getDefinition() const { 553 // We only need an update if we don't already know which 554 // declaration is the definition. 555 auto *DD = DefinitionData ? DefinitionData : dataPtr(); 556 return DD ? DD->Definition : nullptr; 557 } 558 559 bool hasDefinition() const { return DefinitionData || dataPtr(); } 560 561 static CXXRecordDecl *Create(const ASTContext &C, TagKind TK, DeclContext *DC, 562 SourceLocation StartLoc, SourceLocation IdLoc, 563 IdentifierInfo *Id, 564 CXXRecordDecl *PrevDecl = nullptr, 565 bool DelayTypeCreation = false); 566 static CXXRecordDecl *CreateLambda(const ASTContext &C, DeclContext *DC, 567 TypeSourceInfo *Info, SourceLocation Loc, 568 unsigned DependencyKind, bool IsGeneric, 569 LambdaCaptureDefault CaptureDefault); 570 static CXXRecordDecl *CreateDeserialized(const ASTContext &C, unsigned ID); 571 572 bool isDynamicClass() const { 573 return data().Polymorphic || data().NumVBases != 0; 574 } 575 576 /// @returns true if class is dynamic or might be dynamic because the 577 /// definition is incomplete of dependent. 578 bool mayBeDynamicClass() const { 579 return !hasDefinition() || isDynamicClass() || hasAnyDependentBases(); 580 } 581 582 /// @returns true if class is non dynamic or might be non dynamic because the 583 /// definition is incomplete of dependent. 584 bool mayBeNonDynamicClass() const { 585 return !hasDefinition() || !isDynamicClass() || hasAnyDependentBases(); 586 } 587 588 void setIsParsingBaseSpecifiers() { data().IsParsingBaseSpecifiers = true; } 589 590 bool isParsingBaseSpecifiers() const { 591 return data().IsParsingBaseSpecifiers; 592 } 593 594 unsigned getODRHash() const; 595 596 /// Sets the base classes of this struct or class. 597 void setBases(CXXBaseSpecifier const * const *Bases, unsigned NumBases); 598 599 /// Retrieves the number of base classes of this class. 600 unsigned getNumBases() const { return data().NumBases; } 601 602 using base_class_range = llvm::iterator_range<base_class_iterator>; 603 using base_class_const_range = 604 llvm::iterator_range<base_class_const_iterator>; 605 606 base_class_range bases() { 607 return base_class_range(bases_begin(), bases_end()); 608 } 609 base_class_const_range bases() const { 610 return base_class_const_range(bases_begin(), bases_end()); 611 } 612 613 base_class_iterator bases_begin() { return data().getBases(); } 614 base_class_const_iterator bases_begin() const { return data().getBases(); } 615 base_class_iterator bases_end() { return bases_begin() + data().NumBases; } 616 base_class_const_iterator bases_end() const { 617 return bases_begin() + data().NumBases; 618 } 619 620 /// Retrieves the number of virtual base classes of this class. 621 unsigned getNumVBases() const { return data().NumVBases; } 622 623 base_class_range vbases() { 624 return base_class_range(vbases_begin(), vbases_end()); 625 } 626 base_class_const_range vbases() const { 627 return base_class_const_range(vbases_begin(), vbases_end()); 628 } 629 630 base_class_iterator vbases_begin() { return data().getVBases(); } 631 base_class_const_iterator vbases_begin() const { return data().getVBases(); } 632 base_class_iterator vbases_end() { return vbases_begin() + data().NumVBases; } 633 base_class_const_iterator vbases_end() const { 634 return vbases_begin() + data().NumVBases; 635 } 636 637 /// Determine whether this class has any dependent base classes which 638 /// are not the current instantiation. 639 bool hasAnyDependentBases() const; 640 641 /// Iterator access to method members. The method iterator visits 642 /// all method members of the class, including non-instance methods, 643 /// special methods, etc. 644 using method_iterator = specific_decl_iterator<CXXMethodDecl>; 645 using method_range = 646 llvm::iterator_range<specific_decl_iterator<CXXMethodDecl>>; 647 648 method_range methods() const { 649 return method_range(method_begin(), method_end()); 650 } 651 652 /// Method begin iterator. Iterates in the order the methods 653 /// were declared. 654 method_iterator method_begin() const { 655 return method_iterator(decls_begin()); 656 } 657 658 /// Method past-the-end iterator. 659 method_iterator method_end() const { 660 return method_iterator(decls_end()); 661 } 662 663 /// Iterator access to constructor members. 664 using ctor_iterator = specific_decl_iterator<CXXConstructorDecl>; 665 using ctor_range = 666 llvm::iterator_range<specific_decl_iterator<CXXConstructorDecl>>; 667 668 ctor_range ctors() const { return ctor_range(ctor_begin(), ctor_end()); } 669 670 ctor_iterator ctor_begin() const { 671 return ctor_iterator(decls_begin()); 672 } 673 674 ctor_iterator ctor_end() const { 675 return ctor_iterator(decls_end()); 676 } 677 678 /// An iterator over friend declarations. All of these are defined 679 /// in DeclFriend.h. 680 class friend_iterator; 681 using friend_range = llvm::iterator_range<friend_iterator>; 682 683 friend_range friends() const; 684 friend_iterator friend_begin() const; 685 friend_iterator friend_end() const; 686 void pushFriendDecl(FriendDecl *FD); 687 688 /// Determines whether this record has any friends. 689 bool hasFriends() const { 690 return data().FirstFriend.isValid(); 691 } 692 693 /// \c true if a defaulted copy constructor for this class would be 694 /// deleted. 695 bool defaultedCopyConstructorIsDeleted() const { 696 assert((!needsOverloadResolutionForCopyConstructor() || 697 (data().DeclaredSpecialMembers & SMF_CopyConstructor)) && 698 "this property has not yet been computed by Sema"); 699 return data().DefaultedCopyConstructorIsDeleted; 700 } 701 702 /// \c true if a defaulted move constructor for this class would be 703 /// deleted. 704 bool defaultedMoveConstructorIsDeleted() const { 705 assert((!needsOverloadResolutionForMoveConstructor() || 706 (data().DeclaredSpecialMembers & SMF_MoveConstructor)) && 707 "this property has not yet been computed by Sema"); 708 return data().DefaultedMoveConstructorIsDeleted; 709 } 710 711 /// \c true if a defaulted destructor for this class would be deleted. 712 bool defaultedDestructorIsDeleted() const { 713 assert((!needsOverloadResolutionForDestructor() || 714 (data().DeclaredSpecialMembers & SMF_Destructor)) && 715 "this property has not yet been computed by Sema"); 716 return data().DefaultedDestructorIsDeleted; 717 } 718 719 /// \c true if we know for sure that this class has a single, 720 /// accessible, unambiguous copy constructor that is not deleted. 721 bool hasSimpleCopyConstructor() const { 722 return !hasUserDeclaredCopyConstructor() && 723 !data().DefaultedCopyConstructorIsDeleted; 724 } 725 726 /// \c true if we know for sure that this class has a single, 727 /// accessible, unambiguous move constructor that is not deleted. 728 bool hasSimpleMoveConstructor() const { 729 return !hasUserDeclaredMoveConstructor() && hasMoveConstructor() && 730 !data().DefaultedMoveConstructorIsDeleted; 731 } 732 733 /// \c true if we know for sure that this class has a single, 734 /// accessible, unambiguous copy assignment operator that is not deleted. 735 bool hasSimpleCopyAssignment() const { 736 return !hasUserDeclaredCopyAssignment() && 737 !data().DefaultedCopyAssignmentIsDeleted; 738 } 739 740 /// \c true if we know for sure that this class has a single, 741 /// accessible, unambiguous move assignment operator that is not deleted. 742 bool hasSimpleMoveAssignment() const { 743 return !hasUserDeclaredMoveAssignment() && hasMoveAssignment() && 744 !data().DefaultedMoveAssignmentIsDeleted; 745 } 746 747 /// \c true if we know for sure that this class has an accessible 748 /// destructor that is not deleted. 749 bool hasSimpleDestructor() const { 750 return !hasUserDeclaredDestructor() && 751 !data().DefaultedDestructorIsDeleted; 752 } 753 754 /// Determine whether this class has any default constructors. 755 bool hasDefaultConstructor() const { 756 return (data().DeclaredSpecialMembers & SMF_DefaultConstructor) || 757 needsImplicitDefaultConstructor(); 758 } 759 760 /// Determine if we need to declare a default constructor for 761 /// this class. 762 /// 763 /// This value is used for lazy creation of default constructors. 764 bool needsImplicitDefaultConstructor() const { 765 return (!data().UserDeclaredConstructor && 766 !(data().DeclaredSpecialMembers & SMF_DefaultConstructor) && 767 (!isLambda() || lambdaIsDefaultConstructibleAndAssignable())) || 768 // FIXME: Proposed fix to core wording issue: if a class inherits 769 // a default constructor and doesn't explicitly declare one, one 770 // is declared implicitly. 771 (data().HasInheritedDefaultConstructor && 772 !(data().DeclaredSpecialMembers & SMF_DefaultConstructor)); 773 } 774 775 /// Determine whether this class has any user-declared constructors. 776 /// 777 /// When true, a default constructor will not be implicitly declared. 778 bool hasUserDeclaredConstructor() const { 779 return data().UserDeclaredConstructor; 780 } 781 782 /// Whether this class has a user-provided default constructor 783 /// per C++11. 784 bool hasUserProvidedDefaultConstructor() const { 785 return data().UserProvidedDefaultConstructor; 786 } 787 788 /// Determine whether this class has a user-declared copy constructor. 789 /// 790 /// When false, a copy constructor will be implicitly declared. 791 bool hasUserDeclaredCopyConstructor() const { 792 return data().UserDeclaredSpecialMembers & SMF_CopyConstructor; 793 } 794 795 /// Determine whether this class needs an implicit copy 796 /// constructor to be lazily declared. 797 bool needsImplicitCopyConstructor() const { 798 return !(data().DeclaredSpecialMembers & SMF_CopyConstructor); 799 } 800 801 /// Determine whether we need to eagerly declare a defaulted copy 802 /// constructor for this class. 803 bool needsOverloadResolutionForCopyConstructor() const { 804 // C++17 [class.copy.ctor]p6: 805 // If the class definition declares a move constructor or move assignment 806 // operator, the implicitly declared copy constructor is defined as 807 // deleted. 808 // In MSVC mode, sometimes a declared move assignment does not delete an 809 // implicit copy constructor, so defer this choice to Sema. 810 if (data().UserDeclaredSpecialMembers & 811 (SMF_MoveConstructor | SMF_MoveAssignment)) 812 return true; 813 return data().NeedOverloadResolutionForCopyConstructor; 814 } 815 816 /// Determine whether an implicit copy constructor for this type 817 /// would have a parameter with a const-qualified reference type. 818 bool implicitCopyConstructorHasConstParam() const { 819 return data().ImplicitCopyConstructorCanHaveConstParamForNonVBase && 820 (isAbstract() || 821 data().ImplicitCopyConstructorCanHaveConstParamForVBase); 822 } 823 824 /// Determine whether this class has a copy constructor with 825 /// a parameter type which is a reference to a const-qualified type. 826 bool hasCopyConstructorWithConstParam() const { 827 return data().HasDeclaredCopyConstructorWithConstParam || 828 (needsImplicitCopyConstructor() && 829 implicitCopyConstructorHasConstParam()); 830 } 831 832 /// Whether this class has a user-declared move constructor or 833 /// assignment operator. 834 /// 835 /// When false, a move constructor and assignment operator may be 836 /// implicitly declared. 837 bool hasUserDeclaredMoveOperation() const { 838 return data().UserDeclaredSpecialMembers & 839 (SMF_MoveConstructor | SMF_MoveAssignment); 840 } 841 842 /// Determine whether this class has had a move constructor 843 /// declared by the user. 844 bool hasUserDeclaredMoveConstructor() const { 845 return data().UserDeclaredSpecialMembers & SMF_MoveConstructor; 846 } 847 848 /// Determine whether this class has a move constructor. 849 bool hasMoveConstructor() const { 850 return (data().DeclaredSpecialMembers & SMF_MoveConstructor) || 851 needsImplicitMoveConstructor(); 852 } 853 854 /// Set that we attempted to declare an implicit copy 855 /// constructor, but overload resolution failed so we deleted it. 856 void setImplicitCopyConstructorIsDeleted() { 857 assert((data().DefaultedCopyConstructorIsDeleted || 858 needsOverloadResolutionForCopyConstructor()) && 859 "Copy constructor should not be deleted"); 860 data().DefaultedCopyConstructorIsDeleted = true; 861 } 862 863 /// Set that we attempted to declare an implicit move 864 /// constructor, but overload resolution failed so we deleted it. 865 void setImplicitMoveConstructorIsDeleted() { 866 assert((data().DefaultedMoveConstructorIsDeleted || 867 needsOverloadResolutionForMoveConstructor()) && 868 "move constructor should not be deleted"); 869 data().DefaultedMoveConstructorIsDeleted = true; 870 } 871 872 /// Set that we attempted to declare an implicit destructor, 873 /// but overload resolution failed so we deleted it. 874 void setImplicitDestructorIsDeleted() { 875 assert((data().DefaultedDestructorIsDeleted || 876 needsOverloadResolutionForDestructor()) && 877 "destructor should not be deleted"); 878 data().DefaultedDestructorIsDeleted = true; 879 } 880 881 /// Determine whether this class should get an implicit move 882 /// constructor or if any existing special member function inhibits this. 883 bool needsImplicitMoveConstructor() const { 884 return !(data().DeclaredSpecialMembers & SMF_MoveConstructor) && 885 !hasUserDeclaredCopyConstructor() && 886 !hasUserDeclaredCopyAssignment() && 887 !hasUserDeclaredMoveAssignment() && 888 !hasUserDeclaredDestructor(); 889 } 890 891 /// Determine whether we need to eagerly declare a defaulted move 892 /// constructor for this class. 893 bool needsOverloadResolutionForMoveConstructor() const { 894 return data().NeedOverloadResolutionForMoveConstructor; 895 } 896 897 /// Determine whether this class has a user-declared copy assignment 898 /// operator. 899 /// 900 /// When false, a copy assignment operator will be implicitly declared. 901 bool hasUserDeclaredCopyAssignment() const { 902 return data().UserDeclaredSpecialMembers & SMF_CopyAssignment; 903 } 904 905 /// Set that we attempted to declare an implicit copy assignment 906 /// operator, but overload resolution failed so we deleted it. 907 void setImplicitCopyAssignmentIsDeleted() { 908 assert((data().DefaultedCopyAssignmentIsDeleted || 909 needsOverloadResolutionForCopyAssignment()) && 910 "copy assignment should not be deleted"); 911 data().DefaultedCopyAssignmentIsDeleted = true; 912 } 913 914 /// Determine whether this class needs an implicit copy 915 /// assignment operator to be lazily declared. 916 bool needsImplicitCopyAssignment() const { 917 return !(data().DeclaredSpecialMembers & SMF_CopyAssignment); 918 } 919 920 /// Determine whether we need to eagerly declare a defaulted copy 921 /// assignment operator for this class. 922 bool needsOverloadResolutionForCopyAssignment() const { 923 // C++20 [class.copy.assign]p2: 924 // If the class definition declares a move constructor or move assignment 925 // operator, the implicitly declared copy assignment operator is defined 926 // as deleted. 927 // In MSVC mode, sometimes a declared move constructor does not delete an 928 // implicit copy assignment, so defer this choice to Sema. 929 if (data().UserDeclaredSpecialMembers & 930 (SMF_MoveConstructor | SMF_MoveAssignment)) 931 return true; 932 return data().NeedOverloadResolutionForCopyAssignment; 933 } 934 935 /// Determine whether an implicit copy assignment operator for this 936 /// type would have a parameter with a const-qualified reference type. 937 bool implicitCopyAssignmentHasConstParam() const { 938 return data().ImplicitCopyAssignmentHasConstParam; 939 } 940 941 /// Determine whether this class has a copy assignment operator with 942 /// a parameter type which is a reference to a const-qualified type or is not 943 /// a reference. 944 bool hasCopyAssignmentWithConstParam() const { 945 return data().HasDeclaredCopyAssignmentWithConstParam || 946 (needsImplicitCopyAssignment() && 947 implicitCopyAssignmentHasConstParam()); 948 } 949 950 /// Determine whether this class has had a move assignment 951 /// declared by the user. 952 bool hasUserDeclaredMoveAssignment() const { 953 return data().UserDeclaredSpecialMembers & SMF_MoveAssignment; 954 } 955 956 /// Determine whether this class has a move assignment operator. 957 bool hasMoveAssignment() const { 958 return (data().DeclaredSpecialMembers & SMF_MoveAssignment) || 959 needsImplicitMoveAssignment(); 960 } 961 962 /// Set that we attempted to declare an implicit move assignment 963 /// operator, but overload resolution failed so we deleted it. 964 void setImplicitMoveAssignmentIsDeleted() { 965 assert((data().DefaultedMoveAssignmentIsDeleted || 966 needsOverloadResolutionForMoveAssignment()) && 967 "move assignment should not be deleted"); 968 data().DefaultedMoveAssignmentIsDeleted = true; 969 } 970 971 /// Determine whether this class should get an implicit move 972 /// assignment operator or if any existing special member function inhibits 973 /// this. 974 bool needsImplicitMoveAssignment() const { 975 return !(data().DeclaredSpecialMembers & SMF_MoveAssignment) && 976 !hasUserDeclaredCopyConstructor() && 977 !hasUserDeclaredCopyAssignment() && 978 !hasUserDeclaredMoveConstructor() && 979 !hasUserDeclaredDestructor() && 980 (!isLambda() || lambdaIsDefaultConstructibleAndAssignable()); 981 } 982 983 /// Determine whether we need to eagerly declare a move assignment 984 /// operator for this class. 985 bool needsOverloadResolutionForMoveAssignment() const { 986 return data().NeedOverloadResolutionForMoveAssignment; 987 } 988 989 /// Determine whether this class has a user-declared destructor. 990 /// 991 /// When false, a destructor will be implicitly declared. 992 bool hasUserDeclaredDestructor() const { 993 return data().UserDeclaredSpecialMembers & SMF_Destructor; 994 } 995 996 /// Determine whether this class needs an implicit destructor to 997 /// be lazily declared. 998 bool needsImplicitDestructor() const { 999 return !(data().DeclaredSpecialMembers & SMF_Destructor); 1000 } 1001 1002 /// Determine whether we need to eagerly declare a destructor for this 1003 /// class. 1004 bool needsOverloadResolutionForDestructor() const { 1005 return data().NeedOverloadResolutionForDestructor; 1006 } 1007 1008 /// Determine whether this class describes a lambda function object. 1009 bool isLambda() const { 1010 // An update record can't turn a non-lambda into a lambda. 1011 auto *DD = DefinitionData; 1012 return DD && DD->IsLambda; 1013 } 1014 1015 /// Determine whether this class describes a generic 1016 /// lambda function object (i.e. function call operator is 1017 /// a template). 1018 bool isGenericLambda() const; 1019 1020 /// Determine whether this lambda should have an implicit default constructor 1021 /// and copy and move assignment operators. 1022 bool lambdaIsDefaultConstructibleAndAssignable() const; 1023 1024 /// Retrieve the lambda call operator of the closure type 1025 /// if this is a closure type. 1026 CXXMethodDecl *getLambdaCallOperator() const; 1027 1028 /// Retrieve the dependent lambda call operator of the closure type 1029 /// if this is a templated closure type. 1030 FunctionTemplateDecl *getDependentLambdaCallOperator() const; 1031 1032 /// Retrieve the lambda static invoker, the address of which 1033 /// is returned by the conversion operator, and the body of which 1034 /// is forwarded to the lambda call operator. The version that does not 1035 /// take a calling convention uses the 'default' calling convention for free 1036 /// functions if the Lambda's calling convention was not modified via 1037 /// attribute. Otherwise, it will return the calling convention specified for 1038 /// the lambda. 1039 CXXMethodDecl *getLambdaStaticInvoker() const; 1040 CXXMethodDecl *getLambdaStaticInvoker(CallingConv CC) const; 1041 1042 /// Retrieve the generic lambda's template parameter list. 1043 /// Returns null if the class does not represent a lambda or a generic 1044 /// lambda. 1045 TemplateParameterList *getGenericLambdaTemplateParameterList() const; 1046 1047 /// Retrieve the lambda template parameters that were specified explicitly. 1048 ArrayRef<NamedDecl *> getLambdaExplicitTemplateParameters() const; 1049 1050 LambdaCaptureDefault getLambdaCaptureDefault() const { 1051 assert(isLambda()); 1052 return static_cast<LambdaCaptureDefault>(getLambdaData().CaptureDefault); 1053 } 1054 1055 /// Set the captures for this lambda closure type. 1056 void setCaptures(ASTContext &Context, ArrayRef<LambdaCapture> Captures); 1057 1058 /// For a closure type, retrieve the mapping from captured 1059 /// variables and \c this to the non-static data members that store the 1060 /// values or references of the captures. 1061 /// 1062 /// \param Captures Will be populated with the mapping from captured 1063 /// variables to the corresponding fields. 1064 /// 1065 /// \param ThisCapture Will be set to the field declaration for the 1066 /// \c this capture. 1067 /// 1068 /// \note No entries will be added for init-captures, as they do not capture 1069 /// variables. 1070 /// 1071 /// \note If multiple versions of the lambda are merged together, they may 1072 /// have different variable declarations corresponding to the same capture. 1073 /// In that case, all of those variable declarations will be added to the 1074 /// Captures list, so it may have more than one variable listed per field. 1075 void 1076 getCaptureFields(llvm::DenseMap<const ValueDecl *, FieldDecl *> &Captures, 1077 FieldDecl *&ThisCapture) const; 1078 1079 using capture_const_iterator = const LambdaCapture *; 1080 using capture_const_range = llvm::iterator_range<capture_const_iterator>; 1081 1082 capture_const_range captures() const { 1083 return capture_const_range(captures_begin(), captures_end()); 1084 } 1085 1086 capture_const_iterator captures_begin() const { 1087 if (!isLambda()) return nullptr; 1088 LambdaDefinitionData &LambdaData = getLambdaData(); 1089 return LambdaData.Captures.empty() ? nullptr : LambdaData.Captures.front(); 1090 } 1091 1092 capture_const_iterator captures_end() const { 1093 return isLambda() ? captures_begin() + getLambdaData().NumCaptures 1094 : nullptr; 1095 } 1096 1097 unsigned capture_size() const { return getLambdaData().NumCaptures; } 1098 1099 const LambdaCapture *getCapture(unsigned I) const { 1100 assert(isLambda() && I < capture_size() && "invalid index for capture"); 1101 return captures_begin() + I; 1102 } 1103 1104 using conversion_iterator = UnresolvedSetIterator; 1105 1106 conversion_iterator conversion_begin() const { 1107 return data().Conversions.get(getASTContext()).begin(); 1108 } 1109 1110 conversion_iterator conversion_end() const { 1111 return data().Conversions.get(getASTContext()).end(); 1112 } 1113 1114 /// Removes a conversion function from this class. The conversion 1115 /// function must currently be a member of this class. Furthermore, 1116 /// this class must currently be in the process of being defined. 1117 void removeConversion(const NamedDecl *Old); 1118 1119 /// Get all conversion functions visible in current class, 1120 /// including conversion function templates. 1121 llvm::iterator_range<conversion_iterator> 1122 getVisibleConversionFunctions() const; 1123 1124 /// Determine whether this class is an aggregate (C++ [dcl.init.aggr]), 1125 /// which is a class with no user-declared constructors, no private 1126 /// or protected non-static data members, no base classes, and no virtual 1127 /// functions (C++ [dcl.init.aggr]p1). 1128 bool isAggregate() const { return data().Aggregate; } 1129 1130 /// Whether this class has any in-class initializers 1131 /// for non-static data members (including those in anonymous unions or 1132 /// structs). 1133 bool hasInClassInitializer() const { return data().HasInClassInitializer; } 1134 1135 /// Whether this class or any of its subobjects has any members of 1136 /// reference type which would make value-initialization ill-formed. 1137 /// 1138 /// Per C++03 [dcl.init]p5: 1139 /// - if T is a non-union class type without a user-declared constructor, 1140 /// then every non-static data member and base-class component of T is 1141 /// value-initialized [...] A program that calls for [...] 1142 /// value-initialization of an entity of reference type is ill-formed. 1143 bool hasUninitializedReferenceMember() const { 1144 return !isUnion() && !hasUserDeclaredConstructor() && 1145 data().HasUninitializedReferenceMember; 1146 } 1147 1148 /// Whether this class is a POD-type (C++ [class]p4) 1149 /// 1150 /// For purposes of this function a class is POD if it is an aggregate 1151 /// that has no non-static non-POD data members, no reference data 1152 /// members, no user-defined copy assignment operator and no 1153 /// user-defined destructor. 1154 /// 1155 /// Note that this is the C++ TR1 definition of POD. 1156 bool isPOD() const { return data().PlainOldData; } 1157 1158 /// True if this class is C-like, without C++-specific features, e.g. 1159 /// it contains only public fields, no bases, tag kind is not 'class', etc. 1160 bool isCLike() const; 1161 1162 /// Determine whether this is an empty class in the sense of 1163 /// (C++11 [meta.unary.prop]). 1164 /// 1165 /// The CXXRecordDecl is a class type, but not a union type, 1166 /// with no non-static data members other than bit-fields of length 0, 1167 /// no virtual member functions, no virtual base classes, 1168 /// and no base class B for which is_empty<B>::value is false. 1169 /// 1170 /// \note This does NOT include a check for union-ness. 1171 bool isEmpty() const { return data().Empty; } 1172 /// Marks this record as empty. This is used by DWARFASTParserClang 1173 /// when parsing records with empty fields having [[no_unique_address]] 1174 /// attribute 1175 void markEmpty() { data().Empty = true; } 1176 1177 void setInitMethod(bool Val) { data().HasInitMethod = Val; } 1178 bool hasInitMethod() const { return data().HasInitMethod; } 1179 1180 bool hasPrivateFields() const { 1181 return data().HasPrivateFields; 1182 } 1183 1184 bool hasProtectedFields() const { 1185 return data().HasProtectedFields; 1186 } 1187 1188 /// Determine whether this class has direct non-static data members. 1189 bool hasDirectFields() const { 1190 auto &D = data(); 1191 return D.HasPublicFields || D.HasProtectedFields || D.HasPrivateFields; 1192 } 1193 1194 /// Whether this class is polymorphic (C++ [class.virtual]), 1195 /// which means that the class contains or inherits a virtual function. 1196 bool isPolymorphic() const { return data().Polymorphic; } 1197 1198 /// Determine whether this class has a pure virtual function. 1199 /// 1200 /// The class is abstract per (C++ [class.abstract]p2) if it declares 1201 /// a pure virtual function or inherits a pure virtual function that is 1202 /// not overridden. 1203 bool isAbstract() const { return data().Abstract; } 1204 1205 /// Determine whether this class is standard-layout per 1206 /// C++ [class]p7. 1207 bool isStandardLayout() const { return data().IsStandardLayout; } 1208 1209 /// Determine whether this class was standard-layout per 1210 /// C++11 [class]p7, specifically using the C++11 rules without any DRs. 1211 bool isCXX11StandardLayout() const { return data().IsCXX11StandardLayout; } 1212 1213 /// Determine whether this class, or any of its class subobjects, 1214 /// contains a mutable field. 1215 bool hasMutableFields() const { return data().HasMutableFields; } 1216 1217 /// Determine whether this class has any variant members. 1218 bool hasVariantMembers() const { return data().HasVariantMembers; } 1219 1220 /// Determine whether this class has a trivial default constructor 1221 /// (C++11 [class.ctor]p5). 1222 bool hasTrivialDefaultConstructor() const { 1223 return hasDefaultConstructor() && 1224 (data().HasTrivialSpecialMembers & SMF_DefaultConstructor); 1225 } 1226 1227 /// Determine whether this class has a non-trivial default constructor 1228 /// (C++11 [class.ctor]p5). 1229 bool hasNonTrivialDefaultConstructor() const { 1230 return (data().DeclaredNonTrivialSpecialMembers & SMF_DefaultConstructor) || 1231 (needsImplicitDefaultConstructor() && 1232 !(data().HasTrivialSpecialMembers & SMF_DefaultConstructor)); 1233 } 1234 1235 /// Determine whether this class has at least one constexpr constructor 1236 /// other than the copy or move constructors. 1237 bool hasConstexprNonCopyMoveConstructor() const { 1238 return data().HasConstexprNonCopyMoveConstructor || 1239 (needsImplicitDefaultConstructor() && 1240 defaultedDefaultConstructorIsConstexpr()); 1241 } 1242 1243 /// Determine whether a defaulted default constructor for this class 1244 /// would be constexpr. 1245 bool defaultedDefaultConstructorIsConstexpr() const { 1246 return data().DefaultedDefaultConstructorIsConstexpr && 1247 (!isUnion() || hasInClassInitializer() || !hasVariantMembers() || 1248 getLangOpts().CPlusPlus20); 1249 } 1250 1251 /// Determine whether this class has a constexpr default constructor. 1252 bool hasConstexprDefaultConstructor() const { 1253 return data().HasConstexprDefaultConstructor || 1254 (needsImplicitDefaultConstructor() && 1255 defaultedDefaultConstructorIsConstexpr()); 1256 } 1257 1258 /// Determine whether this class has a trivial copy constructor 1259 /// (C++ [class.copy]p6, C++11 [class.copy]p12) 1260 bool hasTrivialCopyConstructor() const { 1261 return data().HasTrivialSpecialMembers & SMF_CopyConstructor; 1262 } 1263 1264 bool hasTrivialCopyConstructorForCall() const { 1265 return data().HasTrivialSpecialMembersForCall & SMF_CopyConstructor; 1266 } 1267 1268 /// Determine whether this class has a non-trivial copy constructor 1269 /// (C++ [class.copy]p6, C++11 [class.copy]p12) 1270 bool hasNonTrivialCopyConstructor() const { 1271 return data().DeclaredNonTrivialSpecialMembers & SMF_CopyConstructor || 1272 !hasTrivialCopyConstructor(); 1273 } 1274 1275 bool hasNonTrivialCopyConstructorForCall() const { 1276 return (data().DeclaredNonTrivialSpecialMembersForCall & 1277 SMF_CopyConstructor) || 1278 !hasTrivialCopyConstructorForCall(); 1279 } 1280 1281 /// Determine whether this class has a trivial move constructor 1282 /// (C++11 [class.copy]p12) 1283 bool hasTrivialMoveConstructor() const { 1284 return hasMoveConstructor() && 1285 (data().HasTrivialSpecialMembers & SMF_MoveConstructor); 1286 } 1287 1288 bool hasTrivialMoveConstructorForCall() const { 1289 return hasMoveConstructor() && 1290 (data().HasTrivialSpecialMembersForCall & SMF_MoveConstructor); 1291 } 1292 1293 /// Determine whether this class has a non-trivial move constructor 1294 /// (C++11 [class.copy]p12) 1295 bool hasNonTrivialMoveConstructor() const { 1296 return (data().DeclaredNonTrivialSpecialMembers & SMF_MoveConstructor) || 1297 (needsImplicitMoveConstructor() && 1298 !(data().HasTrivialSpecialMembers & SMF_MoveConstructor)); 1299 } 1300 1301 bool hasNonTrivialMoveConstructorForCall() const { 1302 return (data().DeclaredNonTrivialSpecialMembersForCall & 1303 SMF_MoveConstructor) || 1304 (needsImplicitMoveConstructor() && 1305 !(data().HasTrivialSpecialMembersForCall & SMF_MoveConstructor)); 1306 } 1307 1308 /// Determine whether this class has a trivial copy assignment operator 1309 /// (C++ [class.copy]p11, C++11 [class.copy]p25) 1310 bool hasTrivialCopyAssignment() const { 1311 return data().HasTrivialSpecialMembers & SMF_CopyAssignment; 1312 } 1313 1314 /// Determine whether this class has a non-trivial copy assignment 1315 /// operator (C++ [class.copy]p11, C++11 [class.copy]p25) 1316 bool hasNonTrivialCopyAssignment() const { 1317 return data().DeclaredNonTrivialSpecialMembers & SMF_CopyAssignment || 1318 !hasTrivialCopyAssignment(); 1319 } 1320 1321 /// Determine whether this class has a trivial move assignment operator 1322 /// (C++11 [class.copy]p25) 1323 bool hasTrivialMoveAssignment() const { 1324 return hasMoveAssignment() && 1325 (data().HasTrivialSpecialMembers & SMF_MoveAssignment); 1326 } 1327 1328 /// Determine whether this class has a non-trivial move assignment 1329 /// operator (C++11 [class.copy]p25) 1330 bool hasNonTrivialMoveAssignment() const { 1331 return (data().DeclaredNonTrivialSpecialMembers & SMF_MoveAssignment) || 1332 (needsImplicitMoveAssignment() && 1333 !(data().HasTrivialSpecialMembers & SMF_MoveAssignment)); 1334 } 1335 1336 /// Determine whether a defaulted default constructor for this class 1337 /// would be constexpr. 1338 bool defaultedDestructorIsConstexpr() const { 1339 return data().DefaultedDestructorIsConstexpr && 1340 getLangOpts().CPlusPlus20; 1341 } 1342 1343 /// Determine whether this class has a constexpr destructor. 1344 bool hasConstexprDestructor() const; 1345 1346 /// Determine whether this class has a trivial destructor 1347 /// (C++ [class.dtor]p3) 1348 bool hasTrivialDestructor() const { 1349 return data().HasTrivialSpecialMembers & SMF_Destructor; 1350 } 1351 1352 bool hasTrivialDestructorForCall() const { 1353 return data().HasTrivialSpecialMembersForCall & SMF_Destructor; 1354 } 1355 1356 /// Determine whether this class has a non-trivial destructor 1357 /// (C++ [class.dtor]p3) 1358 bool hasNonTrivialDestructor() const { 1359 return !(data().HasTrivialSpecialMembers & SMF_Destructor); 1360 } 1361 1362 bool hasNonTrivialDestructorForCall() const { 1363 return !(data().HasTrivialSpecialMembersForCall & SMF_Destructor); 1364 } 1365 1366 void setHasTrivialSpecialMemberForCall() { 1367 data().HasTrivialSpecialMembersForCall = 1368 (SMF_CopyConstructor | SMF_MoveConstructor | SMF_Destructor); 1369 } 1370 1371 /// 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 /// 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 /// Determine whether this class has a non-literal or/ volatile type 1389 /// non-static data member or base class. 1390 bool hasNonLiteralTypeFieldsOrBases() const { 1391 return data().HasNonLiteralTypeFieldsOrBases; 1392 } 1393 1394 /// Determine whether this class has a using-declaration that names 1395 /// a user-declared base class constructor. 1396 bool hasInheritedConstructor() const { 1397 return data().HasInheritedConstructor; 1398 } 1399 1400 /// Determine whether this class has a using-declaration that names 1401 /// a base class assignment operator. 1402 bool hasInheritedAssignment() const { 1403 return data().HasInheritedAssignment; 1404 } 1405 1406 /// Determine whether this class is considered trivially copyable per 1407 /// (C++11 [class]p6). 1408 bool isTriviallyCopyable() const; 1409 1410 /// Determine whether this class is considered trivial. 1411 /// 1412 /// C++11 [class]p6: 1413 /// "A trivial class is a class that has a trivial default constructor and 1414 /// is trivially copyable." 1415 bool isTrivial() const { 1416 return isTriviallyCopyable() && hasTrivialDefaultConstructor(); 1417 } 1418 1419 /// Determine whether this class is a literal type. 1420 /// 1421 /// C++11 [basic.types]p10: 1422 /// A class type that has all the following properties: 1423 /// - it has a trivial destructor 1424 /// - every constructor call and full-expression in the 1425 /// brace-or-equal-intializers for non-static data members (if any) is 1426 /// a constant expression. 1427 /// - it is an aggregate type or has at least one constexpr constructor 1428 /// or constructor template that is not a copy or move constructor, and 1429 /// - all of its non-static data members and base classes are of literal 1430 /// types 1431 /// 1432 /// We resolve DR1361 by ignoring the second bullet. We resolve DR1452 by 1433 /// treating types with trivial default constructors as literal types. 1434 /// 1435 /// Only in C++17 and beyond, are lambdas literal types. 1436 bool isLiteral() const { 1437 const LangOptions &LangOpts = getLangOpts(); 1438 return (LangOpts.CPlusPlus20 ? hasConstexprDestructor() 1439 : hasTrivialDestructor()) && 1440 (!isLambda() || LangOpts.CPlusPlus17) && 1441 !hasNonLiteralTypeFieldsOrBases() && 1442 (isAggregate() || isLambda() || 1443 hasConstexprNonCopyMoveConstructor() || 1444 hasTrivialDefaultConstructor()); 1445 } 1446 1447 /// Determine whether this is a structural type. 1448 bool isStructural() const { 1449 return isLiteral() && data().StructuralIfLiteral; 1450 } 1451 1452 /// Notify the class that this destructor is now selected. 1453 /// 1454 /// Important properties of the class depend on destructor properties. Since 1455 /// C++20, it is possible to have multiple destructor declarations in a class 1456 /// out of which one will be selected at the end. 1457 /// This is called separately from addedMember because it has to be deferred 1458 /// to the completion of the class. 1459 void addedSelectedDestructor(CXXDestructorDecl *DD); 1460 1461 /// Notify the class that an eligible SMF has been added. 1462 /// This updates triviality and destructor based properties of the class accordingly. 1463 void addedEligibleSpecialMemberFunction(const CXXMethodDecl *MD, unsigned SMKind); 1464 1465 /// If this record is an instantiation of a member class, 1466 /// retrieves the member class from which it was instantiated. 1467 /// 1468 /// This routine will return non-null for (non-templated) member 1469 /// classes of class templates. For example, given: 1470 /// 1471 /// \code 1472 /// template<typename T> 1473 /// struct X { 1474 /// struct A { }; 1475 /// }; 1476 /// \endcode 1477 /// 1478 /// The declaration for X<int>::A is a (non-templated) CXXRecordDecl 1479 /// whose parent is the class template specialization X<int>. For 1480 /// this declaration, getInstantiatedFromMemberClass() will return 1481 /// the CXXRecordDecl X<T>::A. When a complete definition of 1482 /// X<int>::A is required, it will be instantiated from the 1483 /// declaration returned by getInstantiatedFromMemberClass(). 1484 CXXRecordDecl *getInstantiatedFromMemberClass() const; 1485 1486 /// If this class is an instantiation of a member class of a 1487 /// class template specialization, retrieves the member specialization 1488 /// information. 1489 MemberSpecializationInfo *getMemberSpecializationInfo() const; 1490 1491 /// Specify that this record is an instantiation of the 1492 /// member class \p RD. 1493 void setInstantiationOfMemberClass(CXXRecordDecl *RD, 1494 TemplateSpecializationKind TSK); 1495 1496 /// Retrieves the class template that is described by this 1497 /// class declaration. 1498 /// 1499 /// Every class template is represented as a ClassTemplateDecl and a 1500 /// CXXRecordDecl. The former contains template properties (such as 1501 /// the template parameter lists) while the latter contains the 1502 /// actual description of the template's 1503 /// contents. ClassTemplateDecl::getTemplatedDecl() retrieves the 1504 /// CXXRecordDecl that from a ClassTemplateDecl, while 1505 /// getDescribedClassTemplate() retrieves the ClassTemplateDecl from 1506 /// a CXXRecordDecl. 1507 ClassTemplateDecl *getDescribedClassTemplate() const; 1508 1509 void setDescribedClassTemplate(ClassTemplateDecl *Template); 1510 1511 /// Determine whether this particular class is a specialization or 1512 /// instantiation of a class template or member class of a class template, 1513 /// and how it was instantiated or specialized. 1514 TemplateSpecializationKind getTemplateSpecializationKind() const; 1515 1516 /// Set the kind of specialization or template instantiation this is. 1517 void setTemplateSpecializationKind(TemplateSpecializationKind TSK); 1518 1519 /// Retrieve the record declaration from which this record could be 1520 /// instantiated. Returns null if this class is not a template instantiation. 1521 const CXXRecordDecl *getTemplateInstantiationPattern() const; 1522 1523 CXXRecordDecl *getTemplateInstantiationPattern() { 1524 return const_cast<CXXRecordDecl *>(const_cast<const CXXRecordDecl *>(this) 1525 ->getTemplateInstantiationPattern()); 1526 } 1527 1528 /// Returns the destructor decl for this class. 1529 CXXDestructorDecl *getDestructor() const; 1530 1531 /// Returns true if the class destructor, or any implicitly invoked 1532 /// destructors are marked noreturn. 1533 bool isAnyDestructorNoReturn() const { return data().IsAnyDestructorNoReturn; } 1534 1535 /// If the class is a local class [class.local], returns 1536 /// the enclosing function declaration. 1537 const FunctionDecl *isLocalClass() const { 1538 if (const auto *RD = dyn_cast<CXXRecordDecl>(getDeclContext())) 1539 return RD->isLocalClass(); 1540 1541 return dyn_cast<FunctionDecl>(getDeclContext()); 1542 } 1543 1544 FunctionDecl *isLocalClass() { 1545 return const_cast<FunctionDecl*>( 1546 const_cast<const CXXRecordDecl*>(this)->isLocalClass()); 1547 } 1548 1549 /// Determine whether this dependent class is a current instantiation, 1550 /// when viewed from within the given context. 1551 bool isCurrentInstantiation(const DeclContext *CurContext) const; 1552 1553 /// Determine whether this class is derived from the class \p Base. 1554 /// 1555 /// This routine only determines whether this class is derived from \p Base, 1556 /// but does not account for factors that may make a Derived -> Base class 1557 /// ill-formed, such as private/protected inheritance or multiple, ambiguous 1558 /// base class subobjects. 1559 /// 1560 /// \param Base the base class we are searching for. 1561 /// 1562 /// \returns true if this class is derived from Base, false otherwise. 1563 bool isDerivedFrom(const CXXRecordDecl *Base) const; 1564 1565 /// Determine whether this class is derived from the type \p Base. 1566 /// 1567 /// This routine only determines whether this class is derived from \p Base, 1568 /// but does not account for factors that may make a Derived -> Base class 1569 /// ill-formed, such as private/protected inheritance or multiple, ambiguous 1570 /// base class subobjects. 1571 /// 1572 /// \param Base the base class we are searching for. 1573 /// 1574 /// \param Paths will contain the paths taken from the current class to the 1575 /// given \p Base class. 1576 /// 1577 /// \returns true if this class is derived from \p Base, false otherwise. 1578 /// 1579 /// \todo add a separate parameter to configure IsDerivedFrom, rather than 1580 /// tangling input and output in \p Paths 1581 bool isDerivedFrom(const CXXRecordDecl *Base, CXXBasePaths &Paths) const; 1582 1583 /// Determine whether this class is virtually derived from 1584 /// the class \p Base. 1585 /// 1586 /// This routine only determines whether this class is virtually 1587 /// derived from \p Base, but does not account for factors that may 1588 /// make a Derived -> Base class ill-formed, such as 1589 /// private/protected inheritance or multiple, ambiguous base class 1590 /// subobjects. 1591 /// 1592 /// \param Base the base class we are searching for. 1593 /// 1594 /// \returns true if this class is virtually derived from Base, 1595 /// false otherwise. 1596 bool isVirtuallyDerivedFrom(const CXXRecordDecl *Base) const; 1597 1598 /// Determine whether this class is provably not derived from 1599 /// the type \p Base. 1600 bool isProvablyNotDerivedFrom(const CXXRecordDecl *Base) const; 1601 1602 /// Function type used by forallBases() as a callback. 1603 /// 1604 /// \param BaseDefinition the definition of the base class 1605 /// 1606 /// \returns true if this base matched the search criteria 1607 using ForallBasesCallback = 1608 llvm::function_ref<bool(const CXXRecordDecl *BaseDefinition)>; 1609 1610 /// Determines if the given callback holds for all the direct 1611 /// or indirect base classes of this type. 1612 /// 1613 /// The class itself does not count as a base class. This routine 1614 /// returns false if the class has non-computable base classes. 1615 /// 1616 /// \param BaseMatches Callback invoked for each (direct or indirect) base 1617 /// class of this type until a call returns false. 1618 bool forallBases(ForallBasesCallback BaseMatches) const; 1619 1620 /// Function type used by lookupInBases() to determine whether a 1621 /// specific base class subobject matches the lookup criteria. 1622 /// 1623 /// \param Specifier the base-class specifier that describes the inheritance 1624 /// from the base class we are trying to match. 1625 /// 1626 /// \param Path the current path, from the most-derived class down to the 1627 /// base named by the \p Specifier. 1628 /// 1629 /// \returns true if this base matched the search criteria, false otherwise. 1630 using BaseMatchesCallback = 1631 llvm::function_ref<bool(const CXXBaseSpecifier *Specifier, 1632 CXXBasePath &Path)>; 1633 1634 /// Look for entities within the base classes of this C++ class, 1635 /// transitively searching all base class subobjects. 1636 /// 1637 /// This routine uses the callback function \p BaseMatches to find base 1638 /// classes meeting some search criteria, walking all base class subobjects 1639 /// and populating the given \p Paths structure with the paths through the 1640 /// inheritance hierarchy that resulted in a match. On a successful search, 1641 /// the \p Paths structure can be queried to retrieve the matching paths and 1642 /// to determine if there were any ambiguities. 1643 /// 1644 /// \param BaseMatches callback function used to determine whether a given 1645 /// base matches the user-defined search criteria. 1646 /// 1647 /// \param Paths used to record the paths from this class to its base class 1648 /// subobjects that match the search criteria. 1649 /// 1650 /// \param LookupInDependent can be set to true to extend the search to 1651 /// dependent base classes. 1652 /// 1653 /// \returns true if there exists any path from this class to a base class 1654 /// subobject that matches the search criteria. 1655 bool lookupInBases(BaseMatchesCallback BaseMatches, CXXBasePaths &Paths, 1656 bool LookupInDependent = false) const; 1657 1658 /// Base-class lookup callback that determines whether the given 1659 /// base class specifier refers to a specific class declaration. 1660 /// 1661 /// This callback can be used with \c lookupInBases() to determine whether 1662 /// a given derived class has is a base class subobject of a particular type. 1663 /// The base record pointer should refer to the canonical CXXRecordDecl of the 1664 /// base class that we are searching for. 1665 static bool FindBaseClass(const CXXBaseSpecifier *Specifier, 1666 CXXBasePath &Path, const CXXRecordDecl *BaseRecord); 1667 1668 /// Base-class lookup callback that determines whether the 1669 /// given base class specifier refers to a specific class 1670 /// declaration and describes virtual derivation. 1671 /// 1672 /// This callback can be used with \c lookupInBases() to determine 1673 /// whether a given derived class has is a virtual base class 1674 /// subobject of a particular type. The base record pointer should 1675 /// refer to the canonical CXXRecordDecl of the base class that we 1676 /// are searching for. 1677 static bool FindVirtualBaseClass(const CXXBaseSpecifier *Specifier, 1678 CXXBasePath &Path, 1679 const CXXRecordDecl *BaseRecord); 1680 1681 /// Retrieve the final overriders for each virtual member 1682 /// function in the class hierarchy where this class is the 1683 /// most-derived class in the class hierarchy. 1684 void getFinalOverriders(CXXFinalOverriderMap &FinaOverriders) const; 1685 1686 /// Get the indirect primary bases for this class. 1687 void getIndirectPrimaryBases(CXXIndirectPrimaryBaseSet& Bases) const; 1688 1689 /// Determine whether this class has a member with the given name, possibly 1690 /// in a non-dependent base class. 1691 /// 1692 /// No check for ambiguity is performed, so this should never be used when 1693 /// implementing language semantics, but it may be appropriate for warnings, 1694 /// static analysis, or similar. 1695 bool hasMemberName(DeclarationName N) const; 1696 1697 /// Performs an imprecise lookup of a dependent name in this class. 1698 /// 1699 /// This function does not follow strict semantic rules and should be used 1700 /// only when lookup rules can be relaxed, e.g. indexing. 1701 std::vector<const NamedDecl *> 1702 lookupDependentName(DeclarationName Name, 1703 llvm::function_ref<bool(const NamedDecl *ND)> Filter); 1704 1705 /// Renders and displays an inheritance diagram 1706 /// for this C++ class and all of its base classes (transitively) using 1707 /// GraphViz. 1708 void viewInheritance(ASTContext& Context) const; 1709 1710 /// Calculates the access of a decl that is reached 1711 /// along a path. 1712 static AccessSpecifier MergeAccess(AccessSpecifier PathAccess, 1713 AccessSpecifier DeclAccess) { 1714 assert(DeclAccess != AS_none); 1715 if (DeclAccess == AS_private) return AS_none; 1716 return (PathAccess > DeclAccess ? PathAccess : DeclAccess); 1717 } 1718 1719 /// Indicates that the declaration of a defaulted or deleted special 1720 /// member function is now complete. 1721 void finishedDefaultedOrDeletedMember(CXXMethodDecl *MD); 1722 1723 void setTrivialForCallFlags(CXXMethodDecl *MD); 1724 1725 /// Indicates that the definition of this class is now complete. 1726 void completeDefinition() override; 1727 1728 /// Indicates that the definition of this class is now complete, 1729 /// and provides a final overrider map to help determine 1730 /// 1731 /// \param FinalOverriders The final overrider map for this class, which can 1732 /// be provided as an optimization for abstract-class checking. If NULL, 1733 /// final overriders will be computed if they are needed to complete the 1734 /// definition. 1735 void completeDefinition(CXXFinalOverriderMap *FinalOverriders); 1736 1737 /// Determine whether this class may end up being abstract, even though 1738 /// it is not yet known to be abstract. 1739 /// 1740 /// \returns true if this class is not known to be abstract but has any 1741 /// base classes that are abstract. In this case, \c completeDefinition() 1742 /// will need to compute final overriders to determine whether the class is 1743 /// actually abstract. 1744 bool mayBeAbstract() const; 1745 1746 /// Determine whether it's impossible for a class to be derived from this 1747 /// class. This is best-effort, and may conservatively return false. 1748 bool isEffectivelyFinal() const; 1749 1750 /// If this is the closure type of a lambda expression, retrieve the 1751 /// number to be used for name mangling in the Itanium C++ ABI. 1752 /// 1753 /// Zero indicates that this closure type has internal linkage, so the 1754 /// mangling number does not matter, while a non-zero value indicates which 1755 /// lambda expression this is in this particular context. 1756 unsigned getLambdaManglingNumber() const { 1757 assert(isLambda() && "Not a lambda closure type!"); 1758 return getLambdaData().ManglingNumber; 1759 } 1760 1761 /// The lambda is known to has internal linkage no matter whether it has name 1762 /// mangling number. 1763 bool hasKnownLambdaInternalLinkage() const { 1764 assert(isLambda() && "Not a lambda closure type!"); 1765 return getLambdaData().HasKnownInternalLinkage; 1766 } 1767 1768 /// Retrieve the declaration that provides additional context for a 1769 /// lambda, when the normal declaration context is not specific enough. 1770 /// 1771 /// Certain contexts (default arguments of in-class function parameters and 1772 /// the initializers of data members) have separate name mangling rules for 1773 /// lambdas within the Itanium C++ ABI. For these cases, this routine provides 1774 /// the declaration in which the lambda occurs, e.g., the function parameter 1775 /// or the non-static data member. Otherwise, it returns NULL to imply that 1776 /// the declaration context suffices. 1777 Decl *getLambdaContextDecl() const; 1778 1779 /// Retrieve the index of this lambda within the context declaration returned 1780 /// by getLambdaContextDecl(). 1781 unsigned getLambdaIndexInContext() const { 1782 assert(isLambda() && "Not a lambda closure type!"); 1783 return getLambdaData().IndexInContext; 1784 } 1785 1786 /// Information about how a lambda is numbered within its context. 1787 struct LambdaNumbering { 1788 Decl *ContextDecl = nullptr; 1789 unsigned IndexInContext = 0; 1790 unsigned ManglingNumber = 0; 1791 unsigned DeviceManglingNumber = 0; 1792 bool HasKnownInternalLinkage = false; 1793 }; 1794 1795 /// Set the mangling numbers and context declaration for a lambda class. 1796 void setLambdaNumbering(LambdaNumbering Numbering); 1797 1798 // Get the mangling numbers and context declaration for a lambda class. 1799 LambdaNumbering getLambdaNumbering() const { 1800 return {getLambdaContextDecl(), getLambdaIndexInContext(), 1801 getLambdaManglingNumber(), getDeviceLambdaManglingNumber(), 1802 hasKnownLambdaInternalLinkage()}; 1803 } 1804 1805 /// Retrieve the device side mangling number. 1806 unsigned getDeviceLambdaManglingNumber() const; 1807 1808 /// Returns the inheritance model used for this record. 1809 MSInheritanceModel getMSInheritanceModel() const; 1810 1811 /// Calculate what the inheritance model would be for this class. 1812 MSInheritanceModel calculateInheritanceModel() const; 1813 1814 /// In the Microsoft C++ ABI, use zero for the field offset of a null data 1815 /// member pointer if we can guarantee that zero is not a valid field offset, 1816 /// or if the member pointer has multiple fields. Polymorphic classes have a 1817 /// vfptr at offset zero, so we can use zero for null. If there are multiple 1818 /// fields, we can use zero even if it is a valid field offset because 1819 /// null-ness testing will check the other fields. 1820 bool nullFieldOffsetIsZero() const; 1821 1822 /// Controls when vtordisps will be emitted if this record is used as a 1823 /// virtual base. 1824 MSVtorDispMode getMSVtorDispMode() const; 1825 1826 /// Determine whether this lambda expression was known to be dependent 1827 /// at the time it was created, even if its context does not appear to be 1828 /// dependent. 1829 /// 1830 /// This flag is a workaround for an issue with parsing, where default 1831 /// arguments are parsed before their enclosing function declarations have 1832 /// been created. This means that any lambda expressions within those 1833 /// default arguments will have as their DeclContext the context enclosing 1834 /// the function declaration, which may be non-dependent even when the 1835 /// function declaration itself is dependent. This flag indicates when we 1836 /// know that the lambda is dependent despite that. 1837 bool isDependentLambda() const { 1838 return isLambda() && getLambdaData().DependencyKind == LDK_AlwaysDependent; 1839 } 1840 1841 bool isNeverDependentLambda() const { 1842 return isLambda() && getLambdaData().DependencyKind == LDK_NeverDependent; 1843 } 1844 1845 unsigned getLambdaDependencyKind() const { 1846 if (!isLambda()) 1847 return LDK_Unknown; 1848 return getLambdaData().DependencyKind; 1849 } 1850 1851 TypeSourceInfo *getLambdaTypeInfo() const { 1852 return getLambdaData().MethodTyInfo; 1853 } 1854 1855 void setLambdaTypeInfo(TypeSourceInfo *TS) { 1856 assert(DefinitionData && DefinitionData->IsLambda && 1857 "setting lambda property of non-lambda class"); 1858 auto &DL = static_cast<LambdaDefinitionData &>(*DefinitionData); 1859 DL.MethodTyInfo = TS; 1860 } 1861 1862 void setLambdaIsGeneric(bool IsGeneric) { 1863 assert(DefinitionData && DefinitionData->IsLambda && 1864 "setting lambda property of non-lambda class"); 1865 auto &DL = static_cast<LambdaDefinitionData &>(*DefinitionData); 1866 DL.IsGenericLambda = IsGeneric; 1867 } 1868 1869 // Determine whether this type is an Interface Like type for 1870 // __interface inheritance purposes. 1871 bool isInterfaceLike() const; 1872 1873 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 1874 static bool classofKind(Kind K) { 1875 return K >= firstCXXRecord && K <= lastCXXRecord; 1876 } 1877 void markAbstract() { data().Abstract = true; } 1878 }; 1879 1880 /// Store information needed for an explicit specifier. 1881 /// Used by CXXDeductionGuideDecl, CXXConstructorDecl and CXXConversionDecl. 1882 class ExplicitSpecifier { 1883 llvm::PointerIntPair<Expr *, 2, ExplicitSpecKind> ExplicitSpec{ 1884 nullptr, ExplicitSpecKind::ResolvedFalse}; 1885 1886 public: 1887 ExplicitSpecifier() = default; 1888 ExplicitSpecifier(Expr *Expression, ExplicitSpecKind Kind) 1889 : ExplicitSpec(Expression, Kind) {} 1890 ExplicitSpecKind getKind() const { return ExplicitSpec.getInt(); } 1891 const Expr *getExpr() const { return ExplicitSpec.getPointer(); } 1892 Expr *getExpr() { return ExplicitSpec.getPointer(); } 1893 1894 /// Determine if the declaration had an explicit specifier of any kind. 1895 bool isSpecified() const { 1896 return ExplicitSpec.getInt() != ExplicitSpecKind::ResolvedFalse || 1897 ExplicitSpec.getPointer(); 1898 } 1899 1900 /// Check for equivalence of explicit specifiers. 1901 /// \return true if the explicit specifier are equivalent, false otherwise. 1902 bool isEquivalent(const ExplicitSpecifier Other) const; 1903 /// Determine whether this specifier is known to correspond to an explicit 1904 /// declaration. Returns false if the specifier is absent or has an 1905 /// expression that is value-dependent or evaluates to false. 1906 bool isExplicit() const { 1907 return ExplicitSpec.getInt() == ExplicitSpecKind::ResolvedTrue; 1908 } 1909 /// Determine if the explicit specifier is invalid. 1910 /// This state occurs after a substitution failures. 1911 bool isInvalid() const { 1912 return ExplicitSpec.getInt() == ExplicitSpecKind::Unresolved && 1913 !ExplicitSpec.getPointer(); 1914 } 1915 void setKind(ExplicitSpecKind Kind) { ExplicitSpec.setInt(Kind); } 1916 void setExpr(Expr *E) { ExplicitSpec.setPointer(E); } 1917 // Retrieve the explicit specifier in the given declaration, if any. 1918 static ExplicitSpecifier getFromDecl(FunctionDecl *Function); 1919 static const ExplicitSpecifier getFromDecl(const FunctionDecl *Function) { 1920 return getFromDecl(const_cast<FunctionDecl *>(Function)); 1921 } 1922 static ExplicitSpecifier Invalid() { 1923 return ExplicitSpecifier(nullptr, ExplicitSpecKind::Unresolved); 1924 } 1925 }; 1926 1927 /// Represents a C++ deduction guide declaration. 1928 /// 1929 /// \code 1930 /// template<typename T> struct A { A(); A(T); }; 1931 /// A() -> A<int>; 1932 /// \endcode 1933 /// 1934 /// In this example, there will be an explicit deduction guide from the 1935 /// second line, and implicit deduction guide templates synthesized from 1936 /// the constructors of \c A. 1937 class CXXDeductionGuideDecl : public FunctionDecl { 1938 void anchor() override; 1939 1940 private: 1941 CXXDeductionGuideDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, 1942 ExplicitSpecifier ES, 1943 const DeclarationNameInfo &NameInfo, QualType T, 1944 TypeSourceInfo *TInfo, SourceLocation EndLocation, 1945 CXXConstructorDecl *Ctor, DeductionCandidate Kind) 1946 : FunctionDecl(CXXDeductionGuide, C, DC, StartLoc, NameInfo, T, TInfo, 1947 SC_None, false, false, ConstexprSpecKind::Unspecified), 1948 Ctor(Ctor), ExplicitSpec(ES) { 1949 if (EndLocation.isValid()) 1950 setRangeEnd(EndLocation); 1951 setDeductionCandidateKind(Kind); 1952 } 1953 1954 CXXConstructorDecl *Ctor; 1955 ExplicitSpecifier ExplicitSpec; 1956 void setExplicitSpecifier(ExplicitSpecifier ES) { ExplicitSpec = ES; } 1957 1958 public: 1959 friend class ASTDeclReader; 1960 friend class ASTDeclWriter; 1961 1962 static CXXDeductionGuideDecl * 1963 Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, 1964 ExplicitSpecifier ES, const DeclarationNameInfo &NameInfo, QualType T, 1965 TypeSourceInfo *TInfo, SourceLocation EndLocation, 1966 CXXConstructorDecl *Ctor = nullptr, 1967 DeductionCandidate Kind = DeductionCandidate::Normal); 1968 1969 static CXXDeductionGuideDecl *CreateDeserialized(ASTContext &C, unsigned ID); 1970 1971 ExplicitSpecifier getExplicitSpecifier() { return ExplicitSpec; } 1972 const ExplicitSpecifier getExplicitSpecifier() const { return ExplicitSpec; } 1973 1974 /// Return true if the declaration is already resolved to be explicit. 1975 bool isExplicit() const { return ExplicitSpec.isExplicit(); } 1976 1977 /// Get the template for which this guide performs deduction. 1978 TemplateDecl *getDeducedTemplate() const { 1979 return getDeclName().getCXXDeductionGuideTemplate(); 1980 } 1981 1982 /// Get the constructor from which this deduction guide was generated, if 1983 /// this is an implicit deduction guide. 1984 CXXConstructorDecl *getCorrespondingConstructor() const { return Ctor; } 1985 1986 void setDeductionCandidateKind(DeductionCandidate K) { 1987 FunctionDeclBits.DeductionCandidateKind = static_cast<unsigned char>(K); 1988 } 1989 1990 DeductionCandidate getDeductionCandidateKind() const { 1991 return static_cast<DeductionCandidate>( 1992 FunctionDeclBits.DeductionCandidateKind); 1993 } 1994 1995 // Implement isa/cast/dyncast/etc. 1996 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 1997 static bool classofKind(Kind K) { return K == CXXDeductionGuide; } 1998 }; 1999 2000 /// \brief Represents the body of a requires-expression. 2001 /// 2002 /// This decl exists merely to serve as the DeclContext for the local 2003 /// parameters of the requires expression as well as other declarations inside 2004 /// it. 2005 /// 2006 /// \code 2007 /// template<typename T> requires requires (T t) { {t++} -> regular; } 2008 /// \endcode 2009 /// 2010 /// In this example, a RequiresExpr object will be generated for the expression, 2011 /// and a RequiresExprBodyDecl will be created to hold the parameter t and the 2012 /// template argument list imposed by the compound requirement. 2013 class RequiresExprBodyDecl : public Decl, public DeclContext { 2014 RequiresExprBodyDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc) 2015 : Decl(RequiresExprBody, DC, StartLoc), DeclContext(RequiresExprBody) {} 2016 2017 public: 2018 friend class ASTDeclReader; 2019 friend class ASTDeclWriter; 2020 2021 static RequiresExprBodyDecl *Create(ASTContext &C, DeclContext *DC, 2022 SourceLocation StartLoc); 2023 2024 static RequiresExprBodyDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2025 2026 // Implement isa/cast/dyncast/etc. 2027 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2028 static bool classofKind(Kind K) { return K == RequiresExprBody; } 2029 }; 2030 2031 /// Represents a static or instance method of a struct/union/class. 2032 /// 2033 /// In the terminology of the C++ Standard, these are the (static and 2034 /// non-static) member functions, whether virtual or not. 2035 class CXXMethodDecl : public FunctionDecl { 2036 void anchor() override; 2037 2038 protected: 2039 CXXMethodDecl(Kind DK, ASTContext &C, CXXRecordDecl *RD, 2040 SourceLocation StartLoc, const DeclarationNameInfo &NameInfo, 2041 QualType T, TypeSourceInfo *TInfo, StorageClass SC, 2042 bool UsesFPIntrin, bool isInline, 2043 ConstexprSpecKind ConstexprKind, SourceLocation EndLocation, 2044 Expr *TrailingRequiresClause = nullptr) 2045 : FunctionDecl(DK, C, RD, StartLoc, NameInfo, T, TInfo, SC, UsesFPIntrin, 2046 isInline, ConstexprKind, TrailingRequiresClause) { 2047 if (EndLocation.isValid()) 2048 setRangeEnd(EndLocation); 2049 } 2050 2051 public: 2052 static CXXMethodDecl * 2053 Create(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2054 const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo, 2055 StorageClass SC, bool UsesFPIntrin, bool isInline, 2056 ConstexprSpecKind ConstexprKind, SourceLocation EndLocation, 2057 Expr *TrailingRequiresClause = nullptr); 2058 2059 static CXXMethodDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2060 2061 bool isStatic() const; 2062 bool isInstance() const { return !isStatic(); } 2063 2064 /// Returns true if the given operator is implicitly static in a record 2065 /// context. 2066 static bool isStaticOverloadedOperator(OverloadedOperatorKind OOK) { 2067 // [class.free]p1: 2068 // Any allocation function for a class T is a static member 2069 // (even if not explicitly declared static). 2070 // [class.free]p6 Any deallocation function for a class X is a static member 2071 // (even if not explicitly declared static). 2072 return OOK == OO_New || OOK == OO_Array_New || OOK == OO_Delete || 2073 OOK == OO_Array_Delete; 2074 } 2075 2076 bool isConst() const { return getType()->castAs<FunctionType>()->isConst(); } 2077 bool isVolatile() const { return getType()->castAs<FunctionType>()->isVolatile(); } 2078 2079 bool isVirtual() const { 2080 CXXMethodDecl *CD = const_cast<CXXMethodDecl*>(this)->getCanonicalDecl(); 2081 2082 // Member function is virtual if it is marked explicitly so, or if it is 2083 // declared in __interface -- then it is automatically pure virtual. 2084 if (CD->isVirtualAsWritten() || CD->isPure()) 2085 return true; 2086 2087 return CD->size_overridden_methods() != 0; 2088 } 2089 2090 /// If it's possible to devirtualize a call to this method, return the called 2091 /// function. Otherwise, return null. 2092 2093 /// \param Base The object on which this virtual function is called. 2094 /// \param IsAppleKext True if we are compiling for Apple kext. 2095 CXXMethodDecl *getDevirtualizedMethod(const Expr *Base, bool IsAppleKext); 2096 2097 const CXXMethodDecl *getDevirtualizedMethod(const Expr *Base, 2098 bool IsAppleKext) const { 2099 return const_cast<CXXMethodDecl *>(this)->getDevirtualizedMethod( 2100 Base, IsAppleKext); 2101 } 2102 2103 /// Determine whether this is a usual deallocation function (C++ 2104 /// [basic.stc.dynamic.deallocation]p2), which is an overloaded delete or 2105 /// delete[] operator with a particular signature. Populates \p PreventedBy 2106 /// with the declarations of the functions of the same kind if they were the 2107 /// reason for this function returning false. This is used by 2108 /// Sema::isUsualDeallocationFunction to reconsider the answer based on the 2109 /// context. 2110 bool isUsualDeallocationFunction( 2111 SmallVectorImpl<const FunctionDecl *> &PreventedBy) const; 2112 2113 /// Determine whether this is a copy-assignment operator, regardless 2114 /// of whether it was declared implicitly or explicitly. 2115 bool isCopyAssignmentOperator() const; 2116 2117 /// Determine whether this is a move assignment operator. 2118 bool isMoveAssignmentOperator() const; 2119 2120 CXXMethodDecl *getCanonicalDecl() override { 2121 return cast<CXXMethodDecl>(FunctionDecl::getCanonicalDecl()); 2122 } 2123 const CXXMethodDecl *getCanonicalDecl() const { 2124 return const_cast<CXXMethodDecl*>(this)->getCanonicalDecl(); 2125 } 2126 2127 CXXMethodDecl *getMostRecentDecl() { 2128 return cast<CXXMethodDecl>( 2129 static_cast<FunctionDecl *>(this)->getMostRecentDecl()); 2130 } 2131 const CXXMethodDecl *getMostRecentDecl() const { 2132 return const_cast<CXXMethodDecl*>(this)->getMostRecentDecl(); 2133 } 2134 2135 void addOverriddenMethod(const CXXMethodDecl *MD); 2136 2137 using method_iterator = const CXXMethodDecl *const *; 2138 2139 method_iterator begin_overridden_methods() const; 2140 method_iterator end_overridden_methods() const; 2141 unsigned size_overridden_methods() const; 2142 2143 using overridden_method_range = llvm::iterator_range< 2144 llvm::TinyPtrVector<const CXXMethodDecl *>::const_iterator>; 2145 2146 overridden_method_range overridden_methods() const; 2147 2148 /// Return the parent of this method declaration, which 2149 /// is the class in which this method is defined. 2150 const CXXRecordDecl *getParent() const { 2151 return cast<CXXRecordDecl>(FunctionDecl::getParent()); 2152 } 2153 2154 /// Return the parent of this method declaration, which 2155 /// is the class in which this method is defined. 2156 CXXRecordDecl *getParent() { 2157 return const_cast<CXXRecordDecl *>( 2158 cast<CXXRecordDecl>(FunctionDecl::getParent())); 2159 } 2160 2161 /// Return the type of the \c this pointer. 2162 /// 2163 /// Should only be called for instance (i.e., non-static) methods. Note 2164 /// that for the call operator of a lambda closure type, this returns the 2165 /// desugared 'this' type (a pointer to the closure type), not the captured 2166 /// 'this' type. 2167 QualType getThisType() const; 2168 2169 /// Return the type of the object pointed by \c this. 2170 /// 2171 /// See getThisType() for usage restriction. 2172 QualType getThisObjectType() const; 2173 2174 static QualType getThisType(const FunctionProtoType *FPT, 2175 const CXXRecordDecl *Decl); 2176 2177 static QualType getThisObjectType(const FunctionProtoType *FPT, 2178 const CXXRecordDecl *Decl); 2179 2180 Qualifiers getMethodQualifiers() const { 2181 return getType()->castAs<FunctionProtoType>()->getMethodQuals(); 2182 } 2183 2184 /// Retrieve the ref-qualifier associated with this method. 2185 /// 2186 /// In the following example, \c f() has an lvalue ref-qualifier, \c g() 2187 /// has an rvalue ref-qualifier, and \c h() has no ref-qualifier. 2188 /// @code 2189 /// struct X { 2190 /// void f() &; 2191 /// void g() &&; 2192 /// void h(); 2193 /// }; 2194 /// @endcode 2195 RefQualifierKind getRefQualifier() const { 2196 return getType()->castAs<FunctionProtoType>()->getRefQualifier(); 2197 } 2198 2199 bool hasInlineBody() const; 2200 2201 /// Determine whether this is a lambda closure type's static member 2202 /// function that is used for the result of the lambda's conversion to 2203 /// function pointer (for a lambda with no captures). 2204 /// 2205 /// The function itself, if used, will have a placeholder body that will be 2206 /// supplied by IR generation to either forward to the function call operator 2207 /// or clone the function call operator. 2208 bool isLambdaStaticInvoker() const; 2209 2210 /// Find the method in \p RD that corresponds to this one. 2211 /// 2212 /// Find if \p RD or one of the classes it inherits from override this method. 2213 /// If so, return it. \p RD is assumed to be a subclass of the class defining 2214 /// this method (or be the class itself), unless \p MayBeBase is set to true. 2215 CXXMethodDecl * 2216 getCorrespondingMethodInClass(const CXXRecordDecl *RD, 2217 bool MayBeBase = false); 2218 2219 const CXXMethodDecl * 2220 getCorrespondingMethodInClass(const CXXRecordDecl *RD, 2221 bool MayBeBase = false) const { 2222 return const_cast<CXXMethodDecl *>(this) 2223 ->getCorrespondingMethodInClass(RD, MayBeBase); 2224 } 2225 2226 /// Find if \p RD declares a function that overrides this function, and if so, 2227 /// return it. Does not search base classes. 2228 CXXMethodDecl *getCorrespondingMethodDeclaredInClass(const CXXRecordDecl *RD, 2229 bool MayBeBase = false); 2230 const CXXMethodDecl * 2231 getCorrespondingMethodDeclaredInClass(const CXXRecordDecl *RD, 2232 bool MayBeBase = false) const { 2233 return const_cast<CXXMethodDecl *>(this) 2234 ->getCorrespondingMethodDeclaredInClass(RD, MayBeBase); 2235 } 2236 2237 // Implement isa/cast/dyncast/etc. 2238 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2239 static bool classofKind(Kind K) { 2240 return K >= firstCXXMethod && K <= lastCXXMethod; 2241 } 2242 }; 2243 2244 /// Represents a C++ base or member initializer. 2245 /// 2246 /// This is part of a constructor initializer that 2247 /// initializes one non-static member variable or one base class. For 2248 /// example, in the following, both 'A(a)' and 'f(3.14159)' are member 2249 /// initializers: 2250 /// 2251 /// \code 2252 /// class A { }; 2253 /// class B : public A { 2254 /// float f; 2255 /// public: 2256 /// B(A& a) : A(a), f(3.14159) { } 2257 /// }; 2258 /// \endcode 2259 class CXXCtorInitializer final { 2260 /// Either the base class name/delegating constructor type (stored as 2261 /// a TypeSourceInfo*), an normal field (FieldDecl), or an anonymous field 2262 /// (IndirectFieldDecl*) being initialized. 2263 llvm::PointerUnion<TypeSourceInfo *, FieldDecl *, IndirectFieldDecl *> 2264 Initializee; 2265 2266 /// The argument used to initialize the base or member, which may 2267 /// end up constructing an object (when multiple arguments are involved). 2268 Stmt *Init; 2269 2270 /// The source location for the field name or, for a base initializer 2271 /// pack expansion, the location of the ellipsis. 2272 /// 2273 /// In the case of a delegating 2274 /// constructor, it will still include the type's source location as the 2275 /// Initializee points to the CXXConstructorDecl (to allow loop detection). 2276 SourceLocation MemberOrEllipsisLocation; 2277 2278 /// Location of the left paren of the ctor-initializer. 2279 SourceLocation LParenLoc; 2280 2281 /// Location of the right paren of the ctor-initializer. 2282 SourceLocation RParenLoc; 2283 2284 /// If the initializee is a type, whether that type makes this 2285 /// a delegating initialization. 2286 unsigned IsDelegating : 1; 2287 2288 /// If the initializer is a base initializer, this keeps track 2289 /// of whether the base is virtual or not. 2290 unsigned IsVirtual : 1; 2291 2292 /// Whether or not the initializer is explicitly written 2293 /// in the sources. 2294 unsigned IsWritten : 1; 2295 2296 /// If IsWritten is true, then this number keeps track of the textual order 2297 /// of this initializer in the original sources, counting from 0. 2298 unsigned SourceOrder : 13; 2299 2300 public: 2301 /// Creates a new base-class initializer. 2302 explicit 2303 CXXCtorInitializer(ASTContext &Context, TypeSourceInfo *TInfo, bool IsVirtual, 2304 SourceLocation L, Expr *Init, SourceLocation R, 2305 SourceLocation EllipsisLoc); 2306 2307 /// Creates a new member initializer. 2308 explicit 2309 CXXCtorInitializer(ASTContext &Context, FieldDecl *Member, 2310 SourceLocation MemberLoc, SourceLocation L, Expr *Init, 2311 SourceLocation R); 2312 2313 /// Creates a new anonymous field initializer. 2314 explicit 2315 CXXCtorInitializer(ASTContext &Context, IndirectFieldDecl *Member, 2316 SourceLocation MemberLoc, SourceLocation L, Expr *Init, 2317 SourceLocation R); 2318 2319 /// Creates a new delegating initializer. 2320 explicit 2321 CXXCtorInitializer(ASTContext &Context, TypeSourceInfo *TInfo, 2322 SourceLocation L, Expr *Init, SourceLocation R); 2323 2324 /// \return Unique reproducible object identifier. 2325 int64_t getID(const ASTContext &Context) const; 2326 2327 /// Determine whether this initializer is initializing a base class. 2328 bool isBaseInitializer() const { 2329 return Initializee.is<TypeSourceInfo*>() && !IsDelegating; 2330 } 2331 2332 /// Determine whether this initializer is initializing a non-static 2333 /// data member. 2334 bool isMemberInitializer() const { return Initializee.is<FieldDecl*>(); } 2335 2336 bool isAnyMemberInitializer() const { 2337 return isMemberInitializer() || isIndirectMemberInitializer(); 2338 } 2339 2340 bool isIndirectMemberInitializer() const { 2341 return Initializee.is<IndirectFieldDecl*>(); 2342 } 2343 2344 /// Determine whether this initializer is an implicit initializer 2345 /// generated for a field with an initializer defined on the member 2346 /// declaration. 2347 /// 2348 /// In-class member initializers (also known as "non-static data member 2349 /// initializations", NSDMIs) were introduced in C++11. 2350 bool isInClassMemberInitializer() const { 2351 return Init->getStmtClass() == Stmt::CXXDefaultInitExprClass; 2352 } 2353 2354 /// Determine whether this initializer is creating a delegating 2355 /// constructor. 2356 bool isDelegatingInitializer() const { 2357 return Initializee.is<TypeSourceInfo*>() && IsDelegating; 2358 } 2359 2360 /// Determine whether this initializer is a pack expansion. 2361 bool isPackExpansion() const { 2362 return isBaseInitializer() && MemberOrEllipsisLocation.isValid(); 2363 } 2364 2365 // For a pack expansion, returns the location of the ellipsis. 2366 SourceLocation getEllipsisLoc() const { 2367 if (!isPackExpansion()) 2368 return {}; 2369 return MemberOrEllipsisLocation; 2370 } 2371 2372 /// If this is a base class initializer, returns the type of the 2373 /// base class with location information. Otherwise, returns an NULL 2374 /// type location. 2375 TypeLoc getBaseClassLoc() const; 2376 2377 /// If this is a base class initializer, returns the type of the base class. 2378 /// Otherwise, returns null. 2379 const Type *getBaseClass() const; 2380 2381 /// Returns whether the base is virtual or not. 2382 bool isBaseVirtual() const { 2383 assert(isBaseInitializer() && "Must call this on base initializer!"); 2384 2385 return IsVirtual; 2386 } 2387 2388 /// Returns the declarator information for a base class or delegating 2389 /// initializer. 2390 TypeSourceInfo *getTypeSourceInfo() const { 2391 return Initializee.dyn_cast<TypeSourceInfo *>(); 2392 } 2393 2394 /// If this is a member initializer, returns the declaration of the 2395 /// non-static data member being initialized. Otherwise, returns null. 2396 FieldDecl *getMember() const { 2397 if (isMemberInitializer()) 2398 return Initializee.get<FieldDecl*>(); 2399 return nullptr; 2400 } 2401 2402 FieldDecl *getAnyMember() const { 2403 if (isMemberInitializer()) 2404 return Initializee.get<FieldDecl*>(); 2405 if (isIndirectMemberInitializer()) 2406 return Initializee.get<IndirectFieldDecl*>()->getAnonField(); 2407 return nullptr; 2408 } 2409 2410 IndirectFieldDecl *getIndirectMember() const { 2411 if (isIndirectMemberInitializer()) 2412 return Initializee.get<IndirectFieldDecl*>(); 2413 return nullptr; 2414 } 2415 2416 SourceLocation getMemberLocation() const { 2417 return MemberOrEllipsisLocation; 2418 } 2419 2420 /// Determine the source location of the initializer. 2421 SourceLocation getSourceLocation() const; 2422 2423 /// Determine the source range covering the entire initializer. 2424 SourceRange getSourceRange() const LLVM_READONLY; 2425 2426 /// Determine whether this initializer is explicitly written 2427 /// in the source code. 2428 bool isWritten() const { return IsWritten; } 2429 2430 /// Return the source position of the initializer, counting from 0. 2431 /// If the initializer was implicit, -1 is returned. 2432 int getSourceOrder() const { 2433 return IsWritten ? static_cast<int>(SourceOrder) : -1; 2434 } 2435 2436 /// Set the source order of this initializer. 2437 /// 2438 /// This can only be called once for each initializer; it cannot be called 2439 /// on an initializer having a positive number of (implicit) array indices. 2440 /// 2441 /// This assumes that the initializer was written in the source code, and 2442 /// ensures that isWritten() returns true. 2443 void setSourceOrder(int Pos) { 2444 assert(!IsWritten && 2445 "setSourceOrder() used on implicit initializer"); 2446 assert(SourceOrder == 0 && 2447 "calling twice setSourceOrder() on the same initializer"); 2448 assert(Pos >= 0 && 2449 "setSourceOrder() used to make an initializer implicit"); 2450 IsWritten = true; 2451 SourceOrder = static_cast<unsigned>(Pos); 2452 } 2453 2454 SourceLocation getLParenLoc() const { return LParenLoc; } 2455 SourceLocation getRParenLoc() const { return RParenLoc; } 2456 2457 /// Get the initializer. 2458 Expr *getInit() const { return static_cast<Expr *>(Init); } 2459 }; 2460 2461 /// Description of a constructor that was inherited from a base class. 2462 class InheritedConstructor { 2463 ConstructorUsingShadowDecl *Shadow = nullptr; 2464 CXXConstructorDecl *BaseCtor = nullptr; 2465 2466 public: 2467 InheritedConstructor() = default; 2468 InheritedConstructor(ConstructorUsingShadowDecl *Shadow, 2469 CXXConstructorDecl *BaseCtor) 2470 : Shadow(Shadow), BaseCtor(BaseCtor) {} 2471 2472 explicit operator bool() const { return Shadow; } 2473 2474 ConstructorUsingShadowDecl *getShadowDecl() const { return Shadow; } 2475 CXXConstructorDecl *getConstructor() const { return BaseCtor; } 2476 }; 2477 2478 /// Represents a C++ constructor within a class. 2479 /// 2480 /// For example: 2481 /// 2482 /// \code 2483 /// class X { 2484 /// public: 2485 /// explicit X(int); // represented by a CXXConstructorDecl. 2486 /// }; 2487 /// \endcode 2488 class CXXConstructorDecl final 2489 : public CXXMethodDecl, 2490 private llvm::TrailingObjects<CXXConstructorDecl, InheritedConstructor, 2491 ExplicitSpecifier> { 2492 // This class stores some data in DeclContext::CXXConstructorDeclBits 2493 // to save some space. Use the provided accessors to access it. 2494 2495 /// \name Support for base and member initializers. 2496 /// \{ 2497 /// The arguments used to initialize the base or member. 2498 LazyCXXCtorInitializersPtr CtorInitializers; 2499 2500 CXXConstructorDecl(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2501 const DeclarationNameInfo &NameInfo, QualType T, 2502 TypeSourceInfo *TInfo, ExplicitSpecifier ES, 2503 bool UsesFPIntrin, bool isInline, 2504 bool isImplicitlyDeclared, ConstexprSpecKind ConstexprKind, 2505 InheritedConstructor Inherited, 2506 Expr *TrailingRequiresClause); 2507 2508 void anchor() override; 2509 2510 size_t numTrailingObjects(OverloadToken<InheritedConstructor>) const { 2511 return CXXConstructorDeclBits.IsInheritingConstructor; 2512 } 2513 size_t numTrailingObjects(OverloadToken<ExplicitSpecifier>) const { 2514 return CXXConstructorDeclBits.HasTrailingExplicitSpecifier; 2515 } 2516 2517 ExplicitSpecifier getExplicitSpecifierInternal() const { 2518 if (CXXConstructorDeclBits.HasTrailingExplicitSpecifier) 2519 return *getTrailingObjects<ExplicitSpecifier>(); 2520 return ExplicitSpecifier( 2521 nullptr, CXXConstructorDeclBits.IsSimpleExplicit 2522 ? ExplicitSpecKind::ResolvedTrue 2523 : ExplicitSpecKind::ResolvedFalse); 2524 } 2525 2526 enum TrailingAllocKind { 2527 TAKInheritsConstructor = 1, 2528 TAKHasTailExplicit = 1 << 1, 2529 }; 2530 2531 uint64_t getTrailingAllocKind() const { 2532 return numTrailingObjects(OverloadToken<InheritedConstructor>()) | 2533 (numTrailingObjects(OverloadToken<ExplicitSpecifier>()) << 1); 2534 } 2535 2536 public: 2537 friend class ASTDeclReader; 2538 friend class ASTDeclWriter; 2539 friend TrailingObjects; 2540 2541 static CXXConstructorDecl *CreateDeserialized(ASTContext &C, unsigned ID, 2542 uint64_t AllocKind); 2543 static CXXConstructorDecl * 2544 Create(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2545 const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo, 2546 ExplicitSpecifier ES, bool UsesFPIntrin, bool isInline, 2547 bool isImplicitlyDeclared, ConstexprSpecKind ConstexprKind, 2548 InheritedConstructor Inherited = InheritedConstructor(), 2549 Expr *TrailingRequiresClause = nullptr); 2550 2551 void setExplicitSpecifier(ExplicitSpecifier ES) { 2552 assert((!ES.getExpr() || 2553 CXXConstructorDeclBits.HasTrailingExplicitSpecifier) && 2554 "cannot set this explicit specifier. no trail-allocated space for " 2555 "explicit"); 2556 if (ES.getExpr()) 2557 *getCanonicalDecl()->getTrailingObjects<ExplicitSpecifier>() = ES; 2558 else 2559 CXXConstructorDeclBits.IsSimpleExplicit = ES.isExplicit(); 2560 } 2561 2562 ExplicitSpecifier getExplicitSpecifier() { 2563 return getCanonicalDecl()->getExplicitSpecifierInternal(); 2564 } 2565 const ExplicitSpecifier getExplicitSpecifier() const { 2566 return getCanonicalDecl()->getExplicitSpecifierInternal(); 2567 } 2568 2569 /// Return true if the declaration is already resolved to be explicit. 2570 bool isExplicit() const { return getExplicitSpecifier().isExplicit(); } 2571 2572 /// Iterates through the member/base initializer list. 2573 using init_iterator = CXXCtorInitializer **; 2574 2575 /// Iterates through the member/base initializer list. 2576 using init_const_iterator = CXXCtorInitializer *const *; 2577 2578 using init_range = llvm::iterator_range<init_iterator>; 2579 using init_const_range = llvm::iterator_range<init_const_iterator>; 2580 2581 init_range inits() { return init_range(init_begin(), init_end()); } 2582 init_const_range inits() const { 2583 return init_const_range(init_begin(), init_end()); 2584 } 2585 2586 /// Retrieve an iterator to the first initializer. 2587 init_iterator init_begin() { 2588 const auto *ConstThis = this; 2589 return const_cast<init_iterator>(ConstThis->init_begin()); 2590 } 2591 2592 /// Retrieve an iterator to the first initializer. 2593 init_const_iterator init_begin() const; 2594 2595 /// Retrieve an iterator past the last initializer. 2596 init_iterator init_end() { 2597 return init_begin() + getNumCtorInitializers(); 2598 } 2599 2600 /// Retrieve an iterator past the last initializer. 2601 init_const_iterator init_end() const { 2602 return init_begin() + getNumCtorInitializers(); 2603 } 2604 2605 using init_reverse_iterator = std::reverse_iterator<init_iterator>; 2606 using init_const_reverse_iterator = 2607 std::reverse_iterator<init_const_iterator>; 2608 2609 init_reverse_iterator init_rbegin() { 2610 return init_reverse_iterator(init_end()); 2611 } 2612 init_const_reverse_iterator init_rbegin() const { 2613 return init_const_reverse_iterator(init_end()); 2614 } 2615 2616 init_reverse_iterator init_rend() { 2617 return init_reverse_iterator(init_begin()); 2618 } 2619 init_const_reverse_iterator init_rend() const { 2620 return init_const_reverse_iterator(init_begin()); 2621 } 2622 2623 /// Determine the number of arguments used to initialize the member 2624 /// or base. 2625 unsigned getNumCtorInitializers() const { 2626 return CXXConstructorDeclBits.NumCtorInitializers; 2627 } 2628 2629 void setNumCtorInitializers(unsigned numCtorInitializers) { 2630 CXXConstructorDeclBits.NumCtorInitializers = numCtorInitializers; 2631 // This assert added because NumCtorInitializers is stored 2632 // in CXXConstructorDeclBits as a bitfield and its width has 2633 // been shrunk from 32 bits to fit into CXXConstructorDeclBitfields. 2634 assert(CXXConstructorDeclBits.NumCtorInitializers == 2635 numCtorInitializers && "NumCtorInitializers overflow!"); 2636 } 2637 2638 void setCtorInitializers(CXXCtorInitializer **Initializers) { 2639 CtorInitializers = Initializers; 2640 } 2641 2642 /// Determine whether this constructor is a delegating constructor. 2643 bool isDelegatingConstructor() const { 2644 return (getNumCtorInitializers() == 1) && 2645 init_begin()[0]->isDelegatingInitializer(); 2646 } 2647 2648 /// When this constructor delegates to another, retrieve the target. 2649 CXXConstructorDecl *getTargetConstructor() const; 2650 2651 /// Whether this constructor is a default 2652 /// constructor (C++ [class.ctor]p5), which can be used to 2653 /// default-initialize a class of this type. 2654 bool isDefaultConstructor() const; 2655 2656 /// Whether this constructor is a copy constructor (C++ [class.copy]p2, 2657 /// which can be used to copy the class. 2658 /// 2659 /// \p TypeQuals will be set to the qualifiers on the 2660 /// argument type. For example, \p TypeQuals would be set to \c 2661 /// Qualifiers::Const for the following copy constructor: 2662 /// 2663 /// \code 2664 /// class X { 2665 /// public: 2666 /// X(const X&); 2667 /// }; 2668 /// \endcode 2669 bool isCopyConstructor(unsigned &TypeQuals) const; 2670 2671 /// Whether this constructor is a copy 2672 /// constructor (C++ [class.copy]p2, which can be used to copy the 2673 /// class. 2674 bool isCopyConstructor() const { 2675 unsigned TypeQuals = 0; 2676 return isCopyConstructor(TypeQuals); 2677 } 2678 2679 /// Determine whether this constructor is a move constructor 2680 /// (C++11 [class.copy]p3), which can be used to move values of the class. 2681 /// 2682 /// \param TypeQuals If this constructor is a move constructor, will be set 2683 /// to the type qualifiers on the referent of the first parameter's type. 2684 bool isMoveConstructor(unsigned &TypeQuals) const; 2685 2686 /// Determine whether this constructor is a move constructor 2687 /// (C++11 [class.copy]p3), which can be used to move values of the class. 2688 bool isMoveConstructor() const { 2689 unsigned TypeQuals = 0; 2690 return isMoveConstructor(TypeQuals); 2691 } 2692 2693 /// Determine whether this is a copy or move constructor. 2694 /// 2695 /// \param TypeQuals Will be set to the type qualifiers on the reference 2696 /// parameter, if in fact this is a copy or move constructor. 2697 bool isCopyOrMoveConstructor(unsigned &TypeQuals) const; 2698 2699 /// Determine whether this a copy or move constructor. 2700 bool isCopyOrMoveConstructor() const { 2701 unsigned Quals; 2702 return isCopyOrMoveConstructor(Quals); 2703 } 2704 2705 /// Whether this constructor is a 2706 /// converting constructor (C++ [class.conv.ctor]), which can be 2707 /// used for user-defined conversions. 2708 bool isConvertingConstructor(bool AllowExplicit) const; 2709 2710 /// Determine whether this is a member template specialization that 2711 /// would copy the object to itself. Such constructors are never used to copy 2712 /// an object. 2713 bool isSpecializationCopyingObject() const; 2714 2715 /// Determine whether this is an implicit constructor synthesized to 2716 /// model a call to a constructor inherited from a base class. 2717 bool isInheritingConstructor() const { 2718 return CXXConstructorDeclBits.IsInheritingConstructor; 2719 } 2720 2721 /// State that this is an implicit constructor synthesized to 2722 /// model a call to a constructor inherited from a base class. 2723 void setInheritingConstructor(bool isIC = true) { 2724 CXXConstructorDeclBits.IsInheritingConstructor = isIC; 2725 } 2726 2727 /// Get the constructor that this inheriting constructor is based on. 2728 InheritedConstructor getInheritedConstructor() const { 2729 return isInheritingConstructor() ? 2730 *getTrailingObjects<InheritedConstructor>() : InheritedConstructor(); 2731 } 2732 2733 CXXConstructorDecl *getCanonicalDecl() override { 2734 return cast<CXXConstructorDecl>(FunctionDecl::getCanonicalDecl()); 2735 } 2736 const CXXConstructorDecl *getCanonicalDecl() const { 2737 return const_cast<CXXConstructorDecl*>(this)->getCanonicalDecl(); 2738 } 2739 2740 // Implement isa/cast/dyncast/etc. 2741 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2742 static bool classofKind(Kind K) { return K == CXXConstructor; } 2743 }; 2744 2745 /// Represents a C++ destructor within a class. 2746 /// 2747 /// For example: 2748 /// 2749 /// \code 2750 /// class X { 2751 /// public: 2752 /// ~X(); // represented by a CXXDestructorDecl. 2753 /// }; 2754 /// \endcode 2755 class CXXDestructorDecl : public CXXMethodDecl { 2756 friend class ASTDeclReader; 2757 friend class ASTDeclWriter; 2758 2759 // FIXME: Don't allocate storage for these except in the first declaration 2760 // of a virtual destructor. 2761 FunctionDecl *OperatorDelete = nullptr; 2762 Expr *OperatorDeleteThisArg = nullptr; 2763 2764 CXXDestructorDecl(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2765 const DeclarationNameInfo &NameInfo, QualType T, 2766 TypeSourceInfo *TInfo, bool UsesFPIntrin, bool isInline, 2767 bool isImplicitlyDeclared, ConstexprSpecKind ConstexprKind, 2768 Expr *TrailingRequiresClause = nullptr) 2769 : CXXMethodDecl(CXXDestructor, C, RD, StartLoc, NameInfo, T, TInfo, 2770 SC_None, UsesFPIntrin, isInline, ConstexprKind, 2771 SourceLocation(), TrailingRequiresClause) { 2772 setImplicit(isImplicitlyDeclared); 2773 } 2774 2775 void anchor() override; 2776 2777 public: 2778 static CXXDestructorDecl * 2779 Create(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2780 const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo, 2781 bool UsesFPIntrin, bool isInline, bool isImplicitlyDeclared, 2782 ConstexprSpecKind ConstexprKind, 2783 Expr *TrailingRequiresClause = nullptr); 2784 static CXXDestructorDecl *CreateDeserialized(ASTContext & C, unsigned ID); 2785 2786 void setOperatorDelete(FunctionDecl *OD, Expr *ThisArg); 2787 2788 const FunctionDecl *getOperatorDelete() const { 2789 return getCanonicalDecl()->OperatorDelete; 2790 } 2791 2792 Expr *getOperatorDeleteThisArg() const { 2793 return getCanonicalDecl()->OperatorDeleteThisArg; 2794 } 2795 2796 CXXDestructorDecl *getCanonicalDecl() override { 2797 return cast<CXXDestructorDecl>(FunctionDecl::getCanonicalDecl()); 2798 } 2799 const CXXDestructorDecl *getCanonicalDecl() const { 2800 return const_cast<CXXDestructorDecl*>(this)->getCanonicalDecl(); 2801 } 2802 2803 // Implement isa/cast/dyncast/etc. 2804 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2805 static bool classofKind(Kind K) { return K == CXXDestructor; } 2806 }; 2807 2808 /// Represents a C++ conversion function within a class. 2809 /// 2810 /// For example: 2811 /// 2812 /// \code 2813 /// class X { 2814 /// public: 2815 /// operator bool(); 2816 /// }; 2817 /// \endcode 2818 class CXXConversionDecl : public CXXMethodDecl { 2819 CXXConversionDecl(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2820 const DeclarationNameInfo &NameInfo, QualType T, 2821 TypeSourceInfo *TInfo, bool UsesFPIntrin, bool isInline, 2822 ExplicitSpecifier ES, ConstexprSpecKind ConstexprKind, 2823 SourceLocation EndLocation, 2824 Expr *TrailingRequiresClause = nullptr) 2825 : CXXMethodDecl(CXXConversion, C, RD, StartLoc, NameInfo, T, TInfo, 2826 SC_None, UsesFPIntrin, isInline, ConstexprKind, 2827 EndLocation, TrailingRequiresClause), 2828 ExplicitSpec(ES) {} 2829 void anchor() override; 2830 2831 ExplicitSpecifier ExplicitSpec; 2832 2833 public: 2834 friend class ASTDeclReader; 2835 friend class ASTDeclWriter; 2836 2837 static CXXConversionDecl * 2838 Create(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2839 const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo, 2840 bool UsesFPIntrin, bool isInline, ExplicitSpecifier ES, 2841 ConstexprSpecKind ConstexprKind, SourceLocation EndLocation, 2842 Expr *TrailingRequiresClause = nullptr); 2843 static CXXConversionDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2844 2845 ExplicitSpecifier getExplicitSpecifier() { 2846 return getCanonicalDecl()->ExplicitSpec; 2847 } 2848 2849 const ExplicitSpecifier getExplicitSpecifier() const { 2850 return getCanonicalDecl()->ExplicitSpec; 2851 } 2852 2853 /// Return true if the declaration is already resolved to be explicit. 2854 bool isExplicit() const { return getExplicitSpecifier().isExplicit(); } 2855 void setExplicitSpecifier(ExplicitSpecifier ES) { ExplicitSpec = ES; } 2856 2857 /// Returns the type that this conversion function is converting to. 2858 QualType getConversionType() const { 2859 return getType()->castAs<FunctionType>()->getReturnType(); 2860 } 2861 2862 /// Determine whether this conversion function is a conversion from 2863 /// a lambda closure type to a block pointer. 2864 bool isLambdaToBlockPointerConversion() const; 2865 2866 CXXConversionDecl *getCanonicalDecl() override { 2867 return cast<CXXConversionDecl>(FunctionDecl::getCanonicalDecl()); 2868 } 2869 const CXXConversionDecl *getCanonicalDecl() const { 2870 return const_cast<CXXConversionDecl*>(this)->getCanonicalDecl(); 2871 } 2872 2873 // Implement isa/cast/dyncast/etc. 2874 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2875 static bool classofKind(Kind K) { return K == CXXConversion; } 2876 }; 2877 2878 /// Represents a linkage specification. 2879 /// 2880 /// For example: 2881 /// \code 2882 /// extern "C" void foo(); 2883 /// \endcode 2884 class LinkageSpecDecl : public Decl, public DeclContext { 2885 virtual void anchor(); 2886 // This class stores some data in DeclContext::LinkageSpecDeclBits to save 2887 // some space. Use the provided accessors to access it. 2888 public: 2889 /// Represents the language in a linkage specification. 2890 /// 2891 /// The values are part of the serialization ABI for 2892 /// ASTs and cannot be changed without altering that ABI. 2893 enum LanguageIDs { lang_c = 1, lang_cxx = 2 }; 2894 2895 private: 2896 /// The source location for the extern keyword. 2897 SourceLocation ExternLoc; 2898 2899 /// The source location for the right brace (if valid). 2900 SourceLocation RBraceLoc; 2901 2902 LinkageSpecDecl(DeclContext *DC, SourceLocation ExternLoc, 2903 SourceLocation LangLoc, LanguageIDs lang, bool HasBraces); 2904 2905 public: 2906 static LinkageSpecDecl *Create(ASTContext &C, DeclContext *DC, 2907 SourceLocation ExternLoc, 2908 SourceLocation LangLoc, LanguageIDs Lang, 2909 bool HasBraces); 2910 static LinkageSpecDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2911 2912 /// Return the language specified by this linkage specification. 2913 LanguageIDs getLanguage() const { 2914 return static_cast<LanguageIDs>(LinkageSpecDeclBits.Language); 2915 } 2916 2917 /// Set the language specified by this linkage specification. 2918 void setLanguage(LanguageIDs L) { LinkageSpecDeclBits.Language = L; } 2919 2920 /// Determines whether this linkage specification had braces in 2921 /// its syntactic form. 2922 bool hasBraces() const { 2923 assert(!RBraceLoc.isValid() || LinkageSpecDeclBits.HasBraces); 2924 return LinkageSpecDeclBits.HasBraces; 2925 } 2926 2927 SourceLocation getExternLoc() const { return ExternLoc; } 2928 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2929 void setExternLoc(SourceLocation L) { ExternLoc = L; } 2930 void setRBraceLoc(SourceLocation L) { 2931 RBraceLoc = L; 2932 LinkageSpecDeclBits.HasBraces = RBraceLoc.isValid(); 2933 } 2934 2935 SourceLocation getEndLoc() const LLVM_READONLY { 2936 if (hasBraces()) 2937 return getRBraceLoc(); 2938 // No braces: get the end location of the (only) declaration in context 2939 // (if present). 2940 return decls_empty() ? getLocation() : decls_begin()->getEndLoc(); 2941 } 2942 2943 SourceRange getSourceRange() const override LLVM_READONLY { 2944 return SourceRange(ExternLoc, getEndLoc()); 2945 } 2946 2947 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2948 static bool classofKind(Kind K) { return K == LinkageSpec; } 2949 2950 static DeclContext *castToDeclContext(const LinkageSpecDecl *D) { 2951 return static_cast<DeclContext *>(const_cast<LinkageSpecDecl*>(D)); 2952 } 2953 2954 static LinkageSpecDecl *castFromDeclContext(const DeclContext *DC) { 2955 return static_cast<LinkageSpecDecl *>(const_cast<DeclContext*>(DC)); 2956 } 2957 }; 2958 2959 /// Represents C++ using-directive. 2960 /// 2961 /// For example: 2962 /// \code 2963 /// using namespace std; 2964 /// \endcode 2965 /// 2966 /// \note UsingDirectiveDecl should be Decl not NamedDecl, but we provide 2967 /// artificial names for all using-directives in order to store 2968 /// them in DeclContext effectively. 2969 class UsingDirectiveDecl : public NamedDecl { 2970 /// The location of the \c using keyword. 2971 SourceLocation UsingLoc; 2972 2973 /// The location of the \c namespace keyword. 2974 SourceLocation NamespaceLoc; 2975 2976 /// The nested-name-specifier that precedes the namespace. 2977 NestedNameSpecifierLoc QualifierLoc; 2978 2979 /// The namespace nominated by this using-directive. 2980 NamedDecl *NominatedNamespace; 2981 2982 /// Enclosing context containing both using-directive and nominated 2983 /// namespace. 2984 DeclContext *CommonAncestor; 2985 2986 UsingDirectiveDecl(DeclContext *DC, SourceLocation UsingLoc, 2987 SourceLocation NamespcLoc, 2988 NestedNameSpecifierLoc QualifierLoc, 2989 SourceLocation IdentLoc, 2990 NamedDecl *Nominated, 2991 DeclContext *CommonAncestor) 2992 : NamedDecl(UsingDirective, DC, IdentLoc, getName()), UsingLoc(UsingLoc), 2993 NamespaceLoc(NamespcLoc), QualifierLoc(QualifierLoc), 2994 NominatedNamespace(Nominated), CommonAncestor(CommonAncestor) {} 2995 2996 /// Returns special DeclarationName used by using-directives. 2997 /// 2998 /// This is only used by DeclContext for storing UsingDirectiveDecls in 2999 /// its lookup structure. 3000 static DeclarationName getName() { 3001 return DeclarationName::getUsingDirectiveName(); 3002 } 3003 3004 void anchor() override; 3005 3006 public: 3007 friend class ASTDeclReader; 3008 3009 // Friend for getUsingDirectiveName. 3010 friend class DeclContext; 3011 3012 /// Retrieve the nested-name-specifier that qualifies the 3013 /// name of the namespace, with source-location information. 3014 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3015 3016 /// Retrieve the nested-name-specifier that qualifies the 3017 /// name of the namespace. 3018 NestedNameSpecifier *getQualifier() const { 3019 return QualifierLoc.getNestedNameSpecifier(); 3020 } 3021 3022 NamedDecl *getNominatedNamespaceAsWritten() { return NominatedNamespace; } 3023 const NamedDecl *getNominatedNamespaceAsWritten() const { 3024 return NominatedNamespace; 3025 } 3026 3027 /// Returns the namespace nominated by this using-directive. 3028 NamespaceDecl *getNominatedNamespace(); 3029 3030 const NamespaceDecl *getNominatedNamespace() const { 3031 return const_cast<UsingDirectiveDecl*>(this)->getNominatedNamespace(); 3032 } 3033 3034 /// Returns the common ancestor context of this using-directive and 3035 /// its nominated namespace. 3036 DeclContext *getCommonAncestor() { return CommonAncestor; } 3037 const DeclContext *getCommonAncestor() const { return CommonAncestor; } 3038 3039 /// Return the location of the \c using keyword. 3040 SourceLocation getUsingLoc() const { return UsingLoc; } 3041 3042 // FIXME: Could omit 'Key' in name. 3043 /// Returns the location of the \c namespace keyword. 3044 SourceLocation getNamespaceKeyLocation() const { return NamespaceLoc; } 3045 3046 /// Returns the location of this using declaration's identifier. 3047 SourceLocation getIdentLocation() const { return getLocation(); } 3048 3049 static UsingDirectiveDecl *Create(ASTContext &C, DeclContext *DC, 3050 SourceLocation UsingLoc, 3051 SourceLocation NamespaceLoc, 3052 NestedNameSpecifierLoc QualifierLoc, 3053 SourceLocation IdentLoc, 3054 NamedDecl *Nominated, 3055 DeclContext *CommonAncestor); 3056 static UsingDirectiveDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3057 3058 SourceRange getSourceRange() const override LLVM_READONLY { 3059 return SourceRange(UsingLoc, getLocation()); 3060 } 3061 3062 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3063 static bool classofKind(Kind K) { return K == UsingDirective; } 3064 }; 3065 3066 /// Represents a C++ namespace alias. 3067 /// 3068 /// For example: 3069 /// 3070 /// \code 3071 /// namespace Foo = Bar; 3072 /// \endcode 3073 class NamespaceAliasDecl : public NamedDecl, 3074 public Redeclarable<NamespaceAliasDecl> { 3075 friend class ASTDeclReader; 3076 3077 /// The location of the \c namespace keyword. 3078 SourceLocation NamespaceLoc; 3079 3080 /// The location of the namespace's identifier. 3081 /// 3082 /// This is accessed by TargetNameLoc. 3083 SourceLocation IdentLoc; 3084 3085 /// The nested-name-specifier that precedes the namespace. 3086 NestedNameSpecifierLoc QualifierLoc; 3087 3088 /// The Decl that this alias points to, either a NamespaceDecl or 3089 /// a NamespaceAliasDecl. 3090 NamedDecl *Namespace; 3091 3092 NamespaceAliasDecl(ASTContext &C, DeclContext *DC, 3093 SourceLocation NamespaceLoc, SourceLocation AliasLoc, 3094 IdentifierInfo *Alias, NestedNameSpecifierLoc QualifierLoc, 3095 SourceLocation IdentLoc, NamedDecl *Namespace) 3096 : NamedDecl(NamespaceAlias, DC, AliasLoc, Alias), redeclarable_base(C), 3097 NamespaceLoc(NamespaceLoc), IdentLoc(IdentLoc), 3098 QualifierLoc(QualifierLoc), Namespace(Namespace) {} 3099 3100 void anchor() override; 3101 3102 using redeclarable_base = Redeclarable<NamespaceAliasDecl>; 3103 3104 NamespaceAliasDecl *getNextRedeclarationImpl() override; 3105 NamespaceAliasDecl *getPreviousDeclImpl() override; 3106 NamespaceAliasDecl *getMostRecentDeclImpl() override; 3107 3108 public: 3109 static NamespaceAliasDecl *Create(ASTContext &C, DeclContext *DC, 3110 SourceLocation NamespaceLoc, 3111 SourceLocation AliasLoc, 3112 IdentifierInfo *Alias, 3113 NestedNameSpecifierLoc QualifierLoc, 3114 SourceLocation IdentLoc, 3115 NamedDecl *Namespace); 3116 3117 static NamespaceAliasDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3118 3119 using redecl_range = redeclarable_base::redecl_range; 3120 using redecl_iterator = redeclarable_base::redecl_iterator; 3121 3122 using redeclarable_base::redecls_begin; 3123 using redeclarable_base::redecls_end; 3124 using redeclarable_base::redecls; 3125 using redeclarable_base::getPreviousDecl; 3126 using redeclarable_base::getMostRecentDecl; 3127 3128 NamespaceAliasDecl *getCanonicalDecl() override { 3129 return getFirstDecl(); 3130 } 3131 const NamespaceAliasDecl *getCanonicalDecl() const { 3132 return getFirstDecl(); 3133 } 3134 3135 /// Retrieve the nested-name-specifier that qualifies the 3136 /// name of the namespace, with source-location information. 3137 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3138 3139 /// Retrieve the nested-name-specifier that qualifies the 3140 /// name of the namespace. 3141 NestedNameSpecifier *getQualifier() const { 3142 return QualifierLoc.getNestedNameSpecifier(); 3143 } 3144 3145 /// Retrieve the namespace declaration aliased by this directive. 3146 NamespaceDecl *getNamespace() { 3147 if (auto *AD = dyn_cast<NamespaceAliasDecl>(Namespace)) 3148 return AD->getNamespace(); 3149 3150 return cast<NamespaceDecl>(Namespace); 3151 } 3152 3153 const NamespaceDecl *getNamespace() const { 3154 return const_cast<NamespaceAliasDecl *>(this)->getNamespace(); 3155 } 3156 3157 /// Returns the location of the alias name, i.e. 'foo' in 3158 /// "namespace foo = ns::bar;". 3159 SourceLocation getAliasLoc() const { return getLocation(); } 3160 3161 /// Returns the location of the \c namespace keyword. 3162 SourceLocation getNamespaceLoc() const { return NamespaceLoc; } 3163 3164 /// Returns the location of the identifier in the named namespace. 3165 SourceLocation getTargetNameLoc() const { return IdentLoc; } 3166 3167 /// Retrieve the namespace that this alias refers to, which 3168 /// may either be a NamespaceDecl or a NamespaceAliasDecl. 3169 NamedDecl *getAliasedNamespace() const { return Namespace; } 3170 3171 SourceRange getSourceRange() const override LLVM_READONLY { 3172 return SourceRange(NamespaceLoc, IdentLoc); 3173 } 3174 3175 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3176 static bool classofKind(Kind K) { return K == NamespaceAlias; } 3177 }; 3178 3179 /// Implicit declaration of a temporary that was materialized by 3180 /// a MaterializeTemporaryExpr and lifetime-extended by a declaration 3181 class LifetimeExtendedTemporaryDecl final 3182 : public Decl, 3183 public Mergeable<LifetimeExtendedTemporaryDecl> { 3184 friend class MaterializeTemporaryExpr; 3185 friend class ASTDeclReader; 3186 3187 Stmt *ExprWithTemporary = nullptr; 3188 3189 /// The declaration which lifetime-extended this reference, if any. 3190 /// Either a VarDecl, or (for a ctor-initializer) a FieldDecl. 3191 ValueDecl *ExtendingDecl = nullptr; 3192 unsigned ManglingNumber; 3193 3194 mutable APValue *Value = nullptr; 3195 3196 virtual void anchor(); 3197 3198 LifetimeExtendedTemporaryDecl(Expr *Temp, ValueDecl *EDecl, unsigned Mangling) 3199 : Decl(Decl::LifetimeExtendedTemporary, EDecl->getDeclContext(), 3200 EDecl->getLocation()), 3201 ExprWithTemporary(Temp), ExtendingDecl(EDecl), 3202 ManglingNumber(Mangling) {} 3203 3204 LifetimeExtendedTemporaryDecl(EmptyShell) 3205 : Decl(Decl::LifetimeExtendedTemporary, EmptyShell{}) {} 3206 3207 public: 3208 static LifetimeExtendedTemporaryDecl *Create(Expr *Temp, ValueDecl *EDec, 3209 unsigned Mangling) { 3210 return new (EDec->getASTContext(), EDec->getDeclContext()) 3211 LifetimeExtendedTemporaryDecl(Temp, EDec, Mangling); 3212 } 3213 static LifetimeExtendedTemporaryDecl *CreateDeserialized(ASTContext &C, 3214 unsigned ID) { 3215 return new (C, ID) LifetimeExtendedTemporaryDecl(EmptyShell{}); 3216 } 3217 3218 ValueDecl *getExtendingDecl() { return ExtendingDecl; } 3219 const ValueDecl *getExtendingDecl() const { return ExtendingDecl; } 3220 3221 /// Retrieve the storage duration for the materialized temporary. 3222 StorageDuration getStorageDuration() const; 3223 3224 /// Retrieve the expression to which the temporary materialization conversion 3225 /// was applied. This isn't necessarily the initializer of the temporary due 3226 /// to the C++98 delayed materialization rules, but 3227 /// skipRValueSubobjectAdjustments can be used to find said initializer within 3228 /// the subexpression. 3229 Expr *getTemporaryExpr() { return cast<Expr>(ExprWithTemporary); } 3230 const Expr *getTemporaryExpr() const { return cast<Expr>(ExprWithTemporary); } 3231 3232 unsigned getManglingNumber() const { return ManglingNumber; } 3233 3234 /// Get the storage for the constant value of a materialized temporary 3235 /// of static storage duration. 3236 APValue *getOrCreateValue(bool MayCreate) const; 3237 3238 APValue *getValue() const { return Value; } 3239 3240 // Iterators 3241 Stmt::child_range childrenExpr() { 3242 return Stmt::child_range(&ExprWithTemporary, &ExprWithTemporary + 1); 3243 } 3244 3245 Stmt::const_child_range childrenExpr() const { 3246 return Stmt::const_child_range(&ExprWithTemporary, &ExprWithTemporary + 1); 3247 } 3248 3249 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3250 static bool classofKind(Kind K) { 3251 return K == Decl::LifetimeExtendedTemporary; 3252 } 3253 }; 3254 3255 /// Represents a shadow declaration implicitly introduced into a scope by a 3256 /// (resolved) using-declaration or using-enum-declaration to achieve 3257 /// the desired lookup semantics. 3258 /// 3259 /// For example: 3260 /// \code 3261 /// namespace A { 3262 /// void foo(); 3263 /// void foo(int); 3264 /// struct foo {}; 3265 /// enum bar { bar1, bar2 }; 3266 /// } 3267 /// namespace B { 3268 /// // add a UsingDecl and three UsingShadowDecls (named foo) to B. 3269 /// using A::foo; 3270 /// // adds UsingEnumDecl and two UsingShadowDecls (named bar1 and bar2) to B. 3271 /// using enum A::bar; 3272 /// } 3273 /// \endcode 3274 class UsingShadowDecl : public NamedDecl, public Redeclarable<UsingShadowDecl> { 3275 friend class BaseUsingDecl; 3276 3277 /// The referenced declaration. 3278 NamedDecl *Underlying = nullptr; 3279 3280 /// The using declaration which introduced this decl or the next using 3281 /// shadow declaration contained in the aforementioned using declaration. 3282 NamedDecl *UsingOrNextShadow = nullptr; 3283 3284 void anchor() override; 3285 3286 using redeclarable_base = Redeclarable<UsingShadowDecl>; 3287 3288 UsingShadowDecl *getNextRedeclarationImpl() override { 3289 return getNextRedeclaration(); 3290 } 3291 3292 UsingShadowDecl *getPreviousDeclImpl() override { 3293 return getPreviousDecl(); 3294 } 3295 3296 UsingShadowDecl *getMostRecentDeclImpl() override { 3297 return getMostRecentDecl(); 3298 } 3299 3300 protected: 3301 UsingShadowDecl(Kind K, ASTContext &C, DeclContext *DC, SourceLocation Loc, 3302 DeclarationName Name, BaseUsingDecl *Introducer, 3303 NamedDecl *Target); 3304 UsingShadowDecl(Kind K, ASTContext &C, EmptyShell); 3305 3306 public: 3307 friend class ASTDeclReader; 3308 friend class ASTDeclWriter; 3309 3310 static UsingShadowDecl *Create(ASTContext &C, DeclContext *DC, 3311 SourceLocation Loc, DeclarationName Name, 3312 BaseUsingDecl *Introducer, NamedDecl *Target) { 3313 return new (C, DC) 3314 UsingShadowDecl(UsingShadow, C, DC, Loc, Name, Introducer, Target); 3315 } 3316 3317 static UsingShadowDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3318 3319 using redecl_range = redeclarable_base::redecl_range; 3320 using redecl_iterator = redeclarable_base::redecl_iterator; 3321 3322 using redeclarable_base::redecls_begin; 3323 using redeclarable_base::redecls_end; 3324 using redeclarable_base::redecls; 3325 using redeclarable_base::getPreviousDecl; 3326 using redeclarable_base::getMostRecentDecl; 3327 using redeclarable_base::isFirstDecl; 3328 3329 UsingShadowDecl *getCanonicalDecl() override { 3330 return getFirstDecl(); 3331 } 3332 const UsingShadowDecl *getCanonicalDecl() const { 3333 return getFirstDecl(); 3334 } 3335 3336 /// Gets the underlying declaration which has been brought into the 3337 /// local scope. 3338 NamedDecl *getTargetDecl() const { return Underlying; } 3339 3340 /// Sets the underlying declaration which has been brought into the 3341 /// local scope. 3342 void setTargetDecl(NamedDecl *ND) { 3343 assert(ND && "Target decl is null!"); 3344 Underlying = ND; 3345 // A UsingShadowDecl is never a friend or local extern declaration, even 3346 // if it is a shadow declaration for one. 3347 IdentifierNamespace = 3348 ND->getIdentifierNamespace() & 3349 ~(IDNS_OrdinaryFriend | IDNS_TagFriend | IDNS_LocalExtern); 3350 } 3351 3352 /// Gets the (written or instantiated) using declaration that introduced this 3353 /// declaration. 3354 BaseUsingDecl *getIntroducer() const; 3355 3356 /// The next using shadow declaration contained in the shadow decl 3357 /// chain of the using declaration which introduced this decl. 3358 UsingShadowDecl *getNextUsingShadowDecl() const { 3359 return dyn_cast_or_null<UsingShadowDecl>(UsingOrNextShadow); 3360 } 3361 3362 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3363 static bool classofKind(Kind K) { 3364 return K == Decl::UsingShadow || K == Decl::ConstructorUsingShadow; 3365 } 3366 }; 3367 3368 /// Represents a C++ declaration that introduces decls from somewhere else. It 3369 /// provides a set of the shadow decls so introduced. 3370 3371 class BaseUsingDecl : public NamedDecl { 3372 /// The first shadow declaration of the shadow decl chain associated 3373 /// with this using declaration. 3374 /// 3375 /// The bool member of the pair is a bool flag a derived type may use 3376 /// (UsingDecl makes use of it). 3377 llvm::PointerIntPair<UsingShadowDecl *, 1, bool> FirstUsingShadow; 3378 3379 protected: 3380 BaseUsingDecl(Kind DK, DeclContext *DC, SourceLocation L, DeclarationName N) 3381 : NamedDecl(DK, DC, L, N), FirstUsingShadow(nullptr, false) {} 3382 3383 private: 3384 void anchor() override; 3385 3386 protected: 3387 /// A bool flag for use by a derived type 3388 bool getShadowFlag() const { return FirstUsingShadow.getInt(); } 3389 3390 /// A bool flag a derived type may set 3391 void setShadowFlag(bool V) { FirstUsingShadow.setInt(V); } 3392 3393 public: 3394 friend class ASTDeclReader; 3395 friend class ASTDeclWriter; 3396 3397 /// Iterates through the using shadow declarations associated with 3398 /// this using declaration. 3399 class shadow_iterator { 3400 /// The current using shadow declaration. 3401 UsingShadowDecl *Current = nullptr; 3402 3403 public: 3404 using value_type = UsingShadowDecl *; 3405 using reference = UsingShadowDecl *; 3406 using pointer = UsingShadowDecl *; 3407 using iterator_category = std::forward_iterator_tag; 3408 using difference_type = std::ptrdiff_t; 3409 3410 shadow_iterator() = default; 3411 explicit shadow_iterator(UsingShadowDecl *C) : Current(C) {} 3412 3413 reference operator*() const { return Current; } 3414 pointer operator->() const { return Current; } 3415 3416 shadow_iterator &operator++() { 3417 Current = Current->getNextUsingShadowDecl(); 3418 return *this; 3419 } 3420 3421 shadow_iterator operator++(int) { 3422 shadow_iterator tmp(*this); 3423 ++(*this); 3424 return tmp; 3425 } 3426 3427 friend bool operator==(shadow_iterator x, shadow_iterator y) { 3428 return x.Current == y.Current; 3429 } 3430 friend bool operator!=(shadow_iterator x, shadow_iterator y) { 3431 return x.Current != y.Current; 3432 } 3433 }; 3434 3435 using shadow_range = llvm::iterator_range<shadow_iterator>; 3436 3437 shadow_range shadows() const { 3438 return shadow_range(shadow_begin(), shadow_end()); 3439 } 3440 3441 shadow_iterator shadow_begin() const { 3442 return shadow_iterator(FirstUsingShadow.getPointer()); 3443 } 3444 3445 shadow_iterator shadow_end() const { return shadow_iterator(); } 3446 3447 /// Return the number of shadowed declarations associated with this 3448 /// using declaration. 3449 unsigned shadow_size() const { 3450 return std::distance(shadow_begin(), shadow_end()); 3451 } 3452 3453 void addShadowDecl(UsingShadowDecl *S); 3454 void removeShadowDecl(UsingShadowDecl *S); 3455 3456 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3457 static bool classofKind(Kind K) { return K == Using || K == UsingEnum; } 3458 }; 3459 3460 /// Represents a C++ using-declaration. 3461 /// 3462 /// For example: 3463 /// \code 3464 /// using someNameSpace::someIdentifier; 3465 /// \endcode 3466 class UsingDecl : public BaseUsingDecl, public Mergeable<UsingDecl> { 3467 /// The source location of the 'using' keyword itself. 3468 SourceLocation UsingLocation; 3469 3470 /// The nested-name-specifier that precedes the name. 3471 NestedNameSpecifierLoc QualifierLoc; 3472 3473 /// Provides source/type location info for the declaration name 3474 /// embedded in the ValueDecl base class. 3475 DeclarationNameLoc DNLoc; 3476 3477 UsingDecl(DeclContext *DC, SourceLocation UL, 3478 NestedNameSpecifierLoc QualifierLoc, 3479 const DeclarationNameInfo &NameInfo, bool HasTypenameKeyword) 3480 : BaseUsingDecl(Using, DC, NameInfo.getLoc(), NameInfo.getName()), 3481 UsingLocation(UL), QualifierLoc(QualifierLoc), 3482 DNLoc(NameInfo.getInfo()) { 3483 setShadowFlag(HasTypenameKeyword); 3484 } 3485 3486 void anchor() override; 3487 3488 public: 3489 friend class ASTDeclReader; 3490 friend class ASTDeclWriter; 3491 3492 /// Return the source location of the 'using' keyword. 3493 SourceLocation getUsingLoc() const { return UsingLocation; } 3494 3495 /// Set the source location of the 'using' keyword. 3496 void setUsingLoc(SourceLocation L) { UsingLocation = L; } 3497 3498 /// Retrieve the nested-name-specifier that qualifies the name, 3499 /// with source-location information. 3500 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3501 3502 /// Retrieve the nested-name-specifier that qualifies the name. 3503 NestedNameSpecifier *getQualifier() const { 3504 return QualifierLoc.getNestedNameSpecifier(); 3505 } 3506 3507 DeclarationNameInfo getNameInfo() const { 3508 return DeclarationNameInfo(getDeclName(), getLocation(), DNLoc); 3509 } 3510 3511 /// Return true if it is a C++03 access declaration (no 'using'). 3512 bool isAccessDeclaration() const { return UsingLocation.isInvalid(); } 3513 3514 /// Return true if the using declaration has 'typename'. 3515 bool hasTypename() const { return getShadowFlag(); } 3516 3517 /// Sets whether the using declaration has 'typename'. 3518 void setTypename(bool TN) { setShadowFlag(TN); } 3519 3520 static UsingDecl *Create(ASTContext &C, DeclContext *DC, 3521 SourceLocation UsingL, 3522 NestedNameSpecifierLoc QualifierLoc, 3523 const DeclarationNameInfo &NameInfo, 3524 bool HasTypenameKeyword); 3525 3526 static UsingDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3527 3528 SourceRange getSourceRange() const override LLVM_READONLY; 3529 3530 /// Retrieves the canonical declaration of this declaration. 3531 UsingDecl *getCanonicalDecl() override { 3532 return cast<UsingDecl>(getFirstDecl()); 3533 } 3534 const UsingDecl *getCanonicalDecl() const { 3535 return cast<UsingDecl>(getFirstDecl()); 3536 } 3537 3538 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3539 static bool classofKind(Kind K) { return K == Using; } 3540 }; 3541 3542 /// Represents a shadow constructor declaration introduced into a 3543 /// class by a C++11 using-declaration that names a constructor. 3544 /// 3545 /// For example: 3546 /// \code 3547 /// struct Base { Base(int); }; 3548 /// struct Derived { 3549 /// using Base::Base; // creates a UsingDecl and a ConstructorUsingShadowDecl 3550 /// }; 3551 /// \endcode 3552 class ConstructorUsingShadowDecl final : public UsingShadowDecl { 3553 /// If this constructor using declaration inherted the constructor 3554 /// from an indirect base class, this is the ConstructorUsingShadowDecl 3555 /// in the named direct base class from which the declaration was inherited. 3556 ConstructorUsingShadowDecl *NominatedBaseClassShadowDecl = nullptr; 3557 3558 /// If this constructor using declaration inherted the constructor 3559 /// from an indirect base class, this is the ConstructorUsingShadowDecl 3560 /// that will be used to construct the unique direct or virtual base class 3561 /// that receives the constructor arguments. 3562 ConstructorUsingShadowDecl *ConstructedBaseClassShadowDecl = nullptr; 3563 3564 /// \c true if the constructor ultimately named by this using shadow 3565 /// declaration is within a virtual base class subobject of the class that 3566 /// contains this declaration. 3567 unsigned IsVirtual : 1; 3568 3569 ConstructorUsingShadowDecl(ASTContext &C, DeclContext *DC, SourceLocation Loc, 3570 UsingDecl *Using, NamedDecl *Target, 3571 bool TargetInVirtualBase) 3572 : UsingShadowDecl(ConstructorUsingShadow, C, DC, Loc, 3573 Using->getDeclName(), Using, 3574 Target->getUnderlyingDecl()), 3575 NominatedBaseClassShadowDecl( 3576 dyn_cast<ConstructorUsingShadowDecl>(Target)), 3577 ConstructedBaseClassShadowDecl(NominatedBaseClassShadowDecl), 3578 IsVirtual(TargetInVirtualBase) { 3579 // If we found a constructor that chains to a constructor for a virtual 3580 // base, we should directly call that virtual base constructor instead. 3581 // FIXME: This logic belongs in Sema. 3582 if (NominatedBaseClassShadowDecl && 3583 NominatedBaseClassShadowDecl->constructsVirtualBase()) { 3584 ConstructedBaseClassShadowDecl = 3585 NominatedBaseClassShadowDecl->ConstructedBaseClassShadowDecl; 3586 IsVirtual = true; 3587 } 3588 } 3589 3590 ConstructorUsingShadowDecl(ASTContext &C, EmptyShell Empty) 3591 : UsingShadowDecl(ConstructorUsingShadow, C, Empty), IsVirtual(false) {} 3592 3593 void anchor() override; 3594 3595 public: 3596 friend class ASTDeclReader; 3597 friend class ASTDeclWriter; 3598 3599 static ConstructorUsingShadowDecl *Create(ASTContext &C, DeclContext *DC, 3600 SourceLocation Loc, 3601 UsingDecl *Using, NamedDecl *Target, 3602 bool IsVirtual); 3603 static ConstructorUsingShadowDecl *CreateDeserialized(ASTContext &C, 3604 unsigned ID); 3605 3606 /// Override the UsingShadowDecl's getIntroducer, returning the UsingDecl that 3607 /// introduced this. 3608 UsingDecl *getIntroducer() const { 3609 return cast<UsingDecl>(UsingShadowDecl::getIntroducer()); 3610 } 3611 3612 /// Returns the parent of this using shadow declaration, which 3613 /// is the class in which this is declared. 3614 //@{ 3615 const CXXRecordDecl *getParent() const { 3616 return cast<CXXRecordDecl>(getDeclContext()); 3617 } 3618 CXXRecordDecl *getParent() { 3619 return cast<CXXRecordDecl>(getDeclContext()); 3620 } 3621 //@} 3622 3623 /// Get the inheriting constructor declaration for the direct base 3624 /// class from which this using shadow declaration was inherited, if there is 3625 /// one. This can be different for each redeclaration of the same shadow decl. 3626 ConstructorUsingShadowDecl *getNominatedBaseClassShadowDecl() const { 3627 return NominatedBaseClassShadowDecl; 3628 } 3629 3630 /// Get the inheriting constructor declaration for the base class 3631 /// for which we don't have an explicit initializer, if there is one. 3632 ConstructorUsingShadowDecl *getConstructedBaseClassShadowDecl() const { 3633 return ConstructedBaseClassShadowDecl; 3634 } 3635 3636 /// Get the base class that was named in the using declaration. This 3637 /// can be different for each redeclaration of this same shadow decl. 3638 CXXRecordDecl *getNominatedBaseClass() const; 3639 3640 /// Get the base class whose constructor or constructor shadow 3641 /// declaration is passed the constructor arguments. 3642 CXXRecordDecl *getConstructedBaseClass() const { 3643 return cast<CXXRecordDecl>((ConstructedBaseClassShadowDecl 3644 ? ConstructedBaseClassShadowDecl 3645 : getTargetDecl()) 3646 ->getDeclContext()); 3647 } 3648 3649 /// Returns \c true if the constructed base class is a virtual base 3650 /// class subobject of this declaration's class. 3651 bool constructsVirtualBase() const { 3652 return IsVirtual; 3653 } 3654 3655 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3656 static bool classofKind(Kind K) { return K == ConstructorUsingShadow; } 3657 }; 3658 3659 /// Represents a C++ using-enum-declaration. 3660 /// 3661 /// For example: 3662 /// \code 3663 /// using enum SomeEnumTag ; 3664 /// \endcode 3665 3666 class UsingEnumDecl : public BaseUsingDecl, public Mergeable<UsingEnumDecl> { 3667 /// The source location of the 'using' keyword itself. 3668 SourceLocation UsingLocation; 3669 /// The source location of the 'enum' keyword. 3670 SourceLocation EnumLocation; 3671 /// 'qual::SomeEnum' as an EnumType, possibly with Elaborated/Typedef sugar. 3672 TypeSourceInfo *EnumType; 3673 3674 UsingEnumDecl(DeclContext *DC, DeclarationName DN, SourceLocation UL, 3675 SourceLocation EL, SourceLocation NL, TypeSourceInfo *EnumType) 3676 : BaseUsingDecl(UsingEnum, DC, NL, DN), UsingLocation(UL), EnumLocation(EL), 3677 EnumType(EnumType){} 3678 3679 void anchor() override; 3680 3681 public: 3682 friend class ASTDeclReader; 3683 friend class ASTDeclWriter; 3684 3685 /// The source location of the 'using' keyword. 3686 SourceLocation getUsingLoc() const { return UsingLocation; } 3687 void setUsingLoc(SourceLocation L) { UsingLocation = L; } 3688 3689 /// The source location of the 'enum' keyword. 3690 SourceLocation getEnumLoc() const { return EnumLocation; } 3691 void setEnumLoc(SourceLocation L) { EnumLocation = L; } 3692 NestedNameSpecifier *getQualifier() const { 3693 return getQualifierLoc().getNestedNameSpecifier(); 3694 } 3695 NestedNameSpecifierLoc getQualifierLoc() const { 3696 if (auto ETL = EnumType->getTypeLoc().getAs<ElaboratedTypeLoc>()) 3697 return ETL.getQualifierLoc(); 3698 return NestedNameSpecifierLoc(); 3699 } 3700 // Returns the "qualifier::Name" part as a TypeLoc. 3701 TypeLoc getEnumTypeLoc() const { 3702 return EnumType->getTypeLoc(); 3703 } 3704 TypeSourceInfo *getEnumType() const { 3705 return EnumType; 3706 } 3707 void setEnumType(TypeSourceInfo *TSI) { EnumType = TSI; } 3708 3709 public: 3710 EnumDecl *getEnumDecl() const { return cast<EnumDecl>(EnumType->getType()->getAsTagDecl()); } 3711 3712 static UsingEnumDecl *Create(ASTContext &C, DeclContext *DC, 3713 SourceLocation UsingL, SourceLocation EnumL, 3714 SourceLocation NameL, TypeSourceInfo *EnumType); 3715 3716 static UsingEnumDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3717 3718 SourceRange getSourceRange() const override LLVM_READONLY; 3719 3720 /// Retrieves the canonical declaration of this declaration. 3721 UsingEnumDecl *getCanonicalDecl() override { 3722 return cast<UsingEnumDecl>(getFirstDecl()); 3723 } 3724 const UsingEnumDecl *getCanonicalDecl() const { 3725 return cast<UsingEnumDecl>(getFirstDecl()); 3726 } 3727 3728 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3729 static bool classofKind(Kind K) { return K == UsingEnum; } 3730 }; 3731 3732 /// Represents a pack of using declarations that a single 3733 /// using-declarator pack-expanded into. 3734 /// 3735 /// \code 3736 /// template<typename ...T> struct X : T... { 3737 /// using T::operator()...; 3738 /// using T::operator T...; 3739 /// }; 3740 /// \endcode 3741 /// 3742 /// In the second case above, the UsingPackDecl will have the name 3743 /// 'operator T' (which contains an unexpanded pack), but the individual 3744 /// UsingDecls and UsingShadowDecls will have more reasonable names. 3745 class UsingPackDecl final 3746 : public NamedDecl, public Mergeable<UsingPackDecl>, 3747 private llvm::TrailingObjects<UsingPackDecl, NamedDecl *> { 3748 /// The UnresolvedUsingValueDecl or UnresolvedUsingTypenameDecl from 3749 /// which this waas instantiated. 3750 NamedDecl *InstantiatedFrom; 3751 3752 /// The number of using-declarations created by this pack expansion. 3753 unsigned NumExpansions; 3754 3755 UsingPackDecl(DeclContext *DC, NamedDecl *InstantiatedFrom, 3756 ArrayRef<NamedDecl *> UsingDecls) 3757 : NamedDecl(UsingPack, DC, 3758 InstantiatedFrom ? InstantiatedFrom->getLocation() 3759 : SourceLocation(), 3760 InstantiatedFrom ? InstantiatedFrom->getDeclName() 3761 : DeclarationName()), 3762 InstantiatedFrom(InstantiatedFrom), NumExpansions(UsingDecls.size()) { 3763 std::uninitialized_copy(UsingDecls.begin(), UsingDecls.end(), 3764 getTrailingObjects<NamedDecl *>()); 3765 } 3766 3767 void anchor() override; 3768 3769 public: 3770 friend class ASTDeclReader; 3771 friend class ASTDeclWriter; 3772 friend TrailingObjects; 3773 3774 /// Get the using declaration from which this was instantiated. This will 3775 /// always be an UnresolvedUsingValueDecl or an UnresolvedUsingTypenameDecl 3776 /// that is a pack expansion. 3777 NamedDecl *getInstantiatedFromUsingDecl() const { return InstantiatedFrom; } 3778 3779 /// Get the set of using declarations that this pack expanded into. Note that 3780 /// some of these may still be unresolved. 3781 ArrayRef<NamedDecl *> expansions() const { 3782 return llvm::ArrayRef(getTrailingObjects<NamedDecl *>(), NumExpansions); 3783 } 3784 3785 static UsingPackDecl *Create(ASTContext &C, DeclContext *DC, 3786 NamedDecl *InstantiatedFrom, 3787 ArrayRef<NamedDecl *> UsingDecls); 3788 3789 static UsingPackDecl *CreateDeserialized(ASTContext &C, unsigned ID, 3790 unsigned NumExpansions); 3791 3792 SourceRange getSourceRange() const override LLVM_READONLY { 3793 return InstantiatedFrom->getSourceRange(); 3794 } 3795 3796 UsingPackDecl *getCanonicalDecl() override { return getFirstDecl(); } 3797 const UsingPackDecl *getCanonicalDecl() const { return getFirstDecl(); } 3798 3799 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3800 static bool classofKind(Kind K) { return K == UsingPack; } 3801 }; 3802 3803 /// Represents a dependent using declaration which was not marked with 3804 /// \c typename. 3805 /// 3806 /// Unlike non-dependent using declarations, these *only* bring through 3807 /// non-types; otherwise they would break two-phase lookup. 3808 /// 3809 /// \code 3810 /// template \<class T> class A : public Base<T> { 3811 /// using Base<T>::foo; 3812 /// }; 3813 /// \endcode 3814 class UnresolvedUsingValueDecl : public ValueDecl, 3815 public Mergeable<UnresolvedUsingValueDecl> { 3816 /// The source location of the 'using' keyword 3817 SourceLocation UsingLocation; 3818 3819 /// If this is a pack expansion, the location of the '...'. 3820 SourceLocation EllipsisLoc; 3821 3822 /// The nested-name-specifier that precedes the name. 3823 NestedNameSpecifierLoc QualifierLoc; 3824 3825 /// Provides source/type location info for the declaration name 3826 /// embedded in the ValueDecl base class. 3827 DeclarationNameLoc DNLoc; 3828 3829 UnresolvedUsingValueDecl(DeclContext *DC, QualType Ty, 3830 SourceLocation UsingLoc, 3831 NestedNameSpecifierLoc QualifierLoc, 3832 const DeclarationNameInfo &NameInfo, 3833 SourceLocation EllipsisLoc) 3834 : ValueDecl(UnresolvedUsingValue, DC, 3835 NameInfo.getLoc(), NameInfo.getName(), Ty), 3836 UsingLocation(UsingLoc), EllipsisLoc(EllipsisLoc), 3837 QualifierLoc(QualifierLoc), DNLoc(NameInfo.getInfo()) {} 3838 3839 void anchor() override; 3840 3841 public: 3842 friend class ASTDeclReader; 3843 friend class ASTDeclWriter; 3844 3845 /// Returns the source location of the 'using' keyword. 3846 SourceLocation getUsingLoc() const { return UsingLocation; } 3847 3848 /// Set the source location of the 'using' keyword. 3849 void setUsingLoc(SourceLocation L) { UsingLocation = L; } 3850 3851 /// Return true if it is a C++03 access declaration (no 'using'). 3852 bool isAccessDeclaration() const { return UsingLocation.isInvalid(); } 3853 3854 /// Retrieve the nested-name-specifier that qualifies the name, 3855 /// with source-location information. 3856 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3857 3858 /// Retrieve the nested-name-specifier that qualifies the name. 3859 NestedNameSpecifier *getQualifier() const { 3860 return QualifierLoc.getNestedNameSpecifier(); 3861 } 3862 3863 DeclarationNameInfo getNameInfo() const { 3864 return DeclarationNameInfo(getDeclName(), getLocation(), DNLoc); 3865 } 3866 3867 /// Determine whether this is a pack expansion. 3868 bool isPackExpansion() const { 3869 return EllipsisLoc.isValid(); 3870 } 3871 3872 /// Get the location of the ellipsis if this is a pack expansion. 3873 SourceLocation getEllipsisLoc() const { 3874 return EllipsisLoc; 3875 } 3876 3877 static UnresolvedUsingValueDecl * 3878 Create(ASTContext &C, DeclContext *DC, SourceLocation UsingLoc, 3879 NestedNameSpecifierLoc QualifierLoc, 3880 const DeclarationNameInfo &NameInfo, SourceLocation EllipsisLoc); 3881 3882 static UnresolvedUsingValueDecl * 3883 CreateDeserialized(ASTContext &C, unsigned ID); 3884 3885 SourceRange getSourceRange() const override LLVM_READONLY; 3886 3887 /// Retrieves the canonical declaration of this declaration. 3888 UnresolvedUsingValueDecl *getCanonicalDecl() override { 3889 return getFirstDecl(); 3890 } 3891 const UnresolvedUsingValueDecl *getCanonicalDecl() const { 3892 return getFirstDecl(); 3893 } 3894 3895 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3896 static bool classofKind(Kind K) { return K == UnresolvedUsingValue; } 3897 }; 3898 3899 /// Represents a dependent using declaration which was marked with 3900 /// \c typename. 3901 /// 3902 /// \code 3903 /// template \<class T> class A : public Base<T> { 3904 /// using typename Base<T>::foo; 3905 /// }; 3906 /// \endcode 3907 /// 3908 /// The type associated with an unresolved using typename decl is 3909 /// currently always a typename type. 3910 class UnresolvedUsingTypenameDecl 3911 : public TypeDecl, 3912 public Mergeable<UnresolvedUsingTypenameDecl> { 3913 friend class ASTDeclReader; 3914 3915 /// The source location of the 'typename' keyword 3916 SourceLocation TypenameLocation; 3917 3918 /// If this is a pack expansion, the location of the '...'. 3919 SourceLocation EllipsisLoc; 3920 3921 /// The nested-name-specifier that precedes the name. 3922 NestedNameSpecifierLoc QualifierLoc; 3923 3924 UnresolvedUsingTypenameDecl(DeclContext *DC, SourceLocation UsingLoc, 3925 SourceLocation TypenameLoc, 3926 NestedNameSpecifierLoc QualifierLoc, 3927 SourceLocation TargetNameLoc, 3928 IdentifierInfo *TargetName, 3929 SourceLocation EllipsisLoc) 3930 : TypeDecl(UnresolvedUsingTypename, DC, TargetNameLoc, TargetName, 3931 UsingLoc), 3932 TypenameLocation(TypenameLoc), EllipsisLoc(EllipsisLoc), 3933 QualifierLoc(QualifierLoc) {} 3934 3935 void anchor() override; 3936 3937 public: 3938 /// Returns the source location of the 'using' keyword. 3939 SourceLocation getUsingLoc() const { return getBeginLoc(); } 3940 3941 /// Returns the source location of the 'typename' keyword. 3942 SourceLocation getTypenameLoc() const { return TypenameLocation; } 3943 3944 /// Retrieve the nested-name-specifier that qualifies the name, 3945 /// with source-location information. 3946 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3947 3948 /// Retrieve the nested-name-specifier that qualifies the name. 3949 NestedNameSpecifier *getQualifier() const { 3950 return QualifierLoc.getNestedNameSpecifier(); 3951 } 3952 3953 DeclarationNameInfo getNameInfo() const { 3954 return DeclarationNameInfo(getDeclName(), getLocation()); 3955 } 3956 3957 /// Determine whether this is a pack expansion. 3958 bool isPackExpansion() const { 3959 return EllipsisLoc.isValid(); 3960 } 3961 3962 /// Get the location of the ellipsis if this is a pack expansion. 3963 SourceLocation getEllipsisLoc() const { 3964 return EllipsisLoc; 3965 } 3966 3967 static UnresolvedUsingTypenameDecl * 3968 Create(ASTContext &C, DeclContext *DC, SourceLocation UsingLoc, 3969 SourceLocation TypenameLoc, NestedNameSpecifierLoc QualifierLoc, 3970 SourceLocation TargetNameLoc, DeclarationName TargetName, 3971 SourceLocation EllipsisLoc); 3972 3973 static UnresolvedUsingTypenameDecl * 3974 CreateDeserialized(ASTContext &C, unsigned ID); 3975 3976 /// Retrieves the canonical declaration of this declaration. 3977 UnresolvedUsingTypenameDecl *getCanonicalDecl() override { 3978 return getFirstDecl(); 3979 } 3980 const UnresolvedUsingTypenameDecl *getCanonicalDecl() const { 3981 return getFirstDecl(); 3982 } 3983 3984 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3985 static bool classofKind(Kind K) { return K == UnresolvedUsingTypename; } 3986 }; 3987 3988 /// This node is generated when a using-declaration that was annotated with 3989 /// __attribute__((using_if_exists)) failed to resolve to a known declaration. 3990 /// In that case, Sema builds a UsingShadowDecl whose target is an instance of 3991 /// this declaration, adding it to the current scope. Referring to this 3992 /// declaration in any way is an error. 3993 class UnresolvedUsingIfExistsDecl final : public NamedDecl { 3994 UnresolvedUsingIfExistsDecl(DeclContext *DC, SourceLocation Loc, 3995 DeclarationName Name); 3996 3997 void anchor() override; 3998 3999 public: 4000 static UnresolvedUsingIfExistsDecl *Create(ASTContext &Ctx, DeclContext *DC, 4001 SourceLocation Loc, 4002 DeclarationName Name); 4003 static UnresolvedUsingIfExistsDecl *CreateDeserialized(ASTContext &Ctx, 4004 unsigned ID); 4005 4006 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 4007 static bool classofKind(Kind K) { return K == Decl::UnresolvedUsingIfExists; } 4008 }; 4009 4010 /// Represents a C++11 static_assert declaration. 4011 class StaticAssertDecl : public Decl { 4012 llvm::PointerIntPair<Expr *, 1, bool> AssertExprAndFailed; 4013 Expr *Message; 4014 SourceLocation RParenLoc; 4015 4016 StaticAssertDecl(DeclContext *DC, SourceLocation StaticAssertLoc, 4017 Expr *AssertExpr, Expr *Message, SourceLocation RParenLoc, 4018 bool Failed) 4019 : Decl(StaticAssert, DC, StaticAssertLoc), 4020 AssertExprAndFailed(AssertExpr, Failed), Message(Message), 4021 RParenLoc(RParenLoc) {} 4022 4023 virtual void anchor(); 4024 4025 public: 4026 friend class ASTDeclReader; 4027 4028 static StaticAssertDecl *Create(ASTContext &C, DeclContext *DC, 4029 SourceLocation StaticAssertLoc, 4030 Expr *AssertExpr, Expr *Message, 4031 SourceLocation RParenLoc, bool Failed); 4032 static StaticAssertDecl *CreateDeserialized(ASTContext &C, unsigned ID); 4033 4034 Expr *getAssertExpr() { return AssertExprAndFailed.getPointer(); } 4035 const Expr *getAssertExpr() const { return AssertExprAndFailed.getPointer(); } 4036 4037 Expr *getMessage() { return Message; } 4038 const Expr *getMessage() const { return Message; } 4039 4040 bool isFailed() const { return AssertExprAndFailed.getInt(); } 4041 4042 SourceLocation getRParenLoc() const { return RParenLoc; } 4043 4044 SourceRange getSourceRange() const override LLVM_READONLY { 4045 return SourceRange(getLocation(), getRParenLoc()); 4046 } 4047 4048 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 4049 static bool classofKind(Kind K) { return K == StaticAssert; } 4050 }; 4051 4052 /// A binding in a decomposition declaration. For instance, given: 4053 /// 4054 /// int n[3]; 4055 /// auto &[a, b, c] = n; 4056 /// 4057 /// a, b, and c are BindingDecls, whose bindings are the expressions 4058 /// x[0], x[1], and x[2] respectively, where x is the implicit 4059 /// DecompositionDecl of type 'int (&)[3]'. 4060 class BindingDecl : public ValueDecl { 4061 /// The declaration that this binding binds to part of. 4062 ValueDecl *Decomp; 4063 /// The binding represented by this declaration. References to this 4064 /// declaration are effectively equivalent to this expression (except 4065 /// that it is only evaluated once at the point of declaration of the 4066 /// binding). 4067 Expr *Binding = nullptr; 4068 4069 BindingDecl(DeclContext *DC, SourceLocation IdLoc, IdentifierInfo *Id) 4070 : ValueDecl(Decl::Binding, DC, IdLoc, Id, QualType()) {} 4071 4072 void anchor() override; 4073 4074 public: 4075 friend class ASTDeclReader; 4076 4077 static BindingDecl *Create(ASTContext &C, DeclContext *DC, 4078 SourceLocation IdLoc, IdentifierInfo *Id); 4079 static BindingDecl *CreateDeserialized(ASTContext &C, unsigned ID); 4080 4081 /// Get the expression to which this declaration is bound. This may be null 4082 /// in two different cases: while parsing the initializer for the 4083 /// decomposition declaration, and when the initializer is type-dependent. 4084 Expr *getBinding() const { return Binding; } 4085 4086 /// Get the decomposition declaration that this binding represents a 4087 /// decomposition of. 4088 ValueDecl *getDecomposedDecl() const { return Decomp; } 4089 4090 /// Get the variable (if any) that holds the value of evaluating the binding. 4091 /// Only present for user-defined bindings for tuple-like types. 4092 VarDecl *getHoldingVar() const; 4093 4094 /// Set the binding for this BindingDecl, along with its declared type (which 4095 /// should be a possibly-cv-qualified form of the type of the binding, or a 4096 /// reference to such a type). 4097 void setBinding(QualType DeclaredType, Expr *Binding) { 4098 setType(DeclaredType); 4099 this->Binding = Binding; 4100 } 4101 4102 /// Set the decomposed variable for this BindingDecl. 4103 void setDecomposedDecl(ValueDecl *Decomposed) { Decomp = Decomposed; } 4104 4105 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 4106 static bool classofKind(Kind K) { return K == Decl::Binding; } 4107 }; 4108 4109 /// A decomposition declaration. For instance, given: 4110 /// 4111 /// int n[3]; 4112 /// auto &[a, b, c] = n; 4113 /// 4114 /// the second line declares a DecompositionDecl of type 'int (&)[3]', and 4115 /// three BindingDecls (named a, b, and c). An instance of this class is always 4116 /// unnamed, but behaves in almost all other respects like a VarDecl. 4117 class DecompositionDecl final 4118 : public VarDecl, 4119 private llvm::TrailingObjects<DecompositionDecl, BindingDecl *> { 4120 /// The number of BindingDecl*s following this object. 4121 unsigned NumBindings; 4122 4123 DecompositionDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, 4124 SourceLocation LSquareLoc, QualType T, 4125 TypeSourceInfo *TInfo, StorageClass SC, 4126 ArrayRef<BindingDecl *> Bindings) 4127 : VarDecl(Decomposition, C, DC, StartLoc, LSquareLoc, nullptr, T, TInfo, 4128 SC), 4129 NumBindings(Bindings.size()) { 4130 std::uninitialized_copy(Bindings.begin(), Bindings.end(), 4131 getTrailingObjects<BindingDecl *>()); 4132 for (auto *B : Bindings) 4133 B->setDecomposedDecl(this); 4134 } 4135 4136 void anchor() override; 4137 4138 public: 4139 friend class ASTDeclReader; 4140 friend TrailingObjects; 4141 4142 static DecompositionDecl *Create(ASTContext &C, DeclContext *DC, 4143 SourceLocation StartLoc, 4144 SourceLocation LSquareLoc, 4145 QualType T, TypeSourceInfo *TInfo, 4146 StorageClass S, 4147 ArrayRef<BindingDecl *> Bindings); 4148 static DecompositionDecl *CreateDeserialized(ASTContext &C, unsigned ID, 4149 unsigned NumBindings); 4150 4151 ArrayRef<BindingDecl *> bindings() const { 4152 return llvm::ArrayRef(getTrailingObjects<BindingDecl *>(), NumBindings); 4153 } 4154 4155 void printName(raw_ostream &OS, const PrintingPolicy &Policy) const override; 4156 4157 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 4158 static bool classofKind(Kind K) { return K == Decomposition; } 4159 }; 4160 4161 /// An instance of this class represents the declaration of a property 4162 /// member. This is a Microsoft extension to C++, first introduced in 4163 /// Visual Studio .NET 2003 as a parallel to similar features in C# 4164 /// and Managed C++. 4165 /// 4166 /// A property must always be a non-static class member. 4167 /// 4168 /// A property member superficially resembles a non-static data 4169 /// member, except preceded by a property attribute: 4170 /// __declspec(property(get=GetX, put=PutX)) int x; 4171 /// Either (but not both) of the 'get' and 'put' names may be omitted. 4172 /// 4173 /// A reference to a property is always an lvalue. If the lvalue 4174 /// undergoes lvalue-to-rvalue conversion, then a getter name is 4175 /// required, and that member is called with no arguments. 4176 /// If the lvalue is assigned into, then a setter name is required, 4177 /// and that member is called with one argument, the value assigned. 4178 /// Both operations are potentially overloaded. Compound assignments 4179 /// are permitted, as are the increment and decrement operators. 4180 /// 4181 /// The getter and putter methods are permitted to be overloaded, 4182 /// although their return and parameter types are subject to certain 4183 /// restrictions according to the type of the property. 4184 /// 4185 /// A property declared using an incomplete array type may 4186 /// additionally be subscripted, adding extra parameters to the getter 4187 /// and putter methods. 4188 class MSPropertyDecl : public DeclaratorDecl { 4189 IdentifierInfo *GetterId, *SetterId; 4190 4191 MSPropertyDecl(DeclContext *DC, SourceLocation L, DeclarationName N, 4192 QualType T, TypeSourceInfo *TInfo, SourceLocation StartL, 4193 IdentifierInfo *Getter, IdentifierInfo *Setter) 4194 : DeclaratorDecl(MSProperty, DC, L, N, T, TInfo, StartL), 4195 GetterId(Getter), SetterId(Setter) {} 4196 4197 void anchor() override; 4198 public: 4199 friend class ASTDeclReader; 4200 4201 static MSPropertyDecl *Create(ASTContext &C, DeclContext *DC, 4202 SourceLocation L, DeclarationName N, QualType T, 4203 TypeSourceInfo *TInfo, SourceLocation StartL, 4204 IdentifierInfo *Getter, IdentifierInfo *Setter); 4205 static MSPropertyDecl *CreateDeserialized(ASTContext &C, unsigned ID); 4206 4207 static bool classof(const Decl *D) { return D->getKind() == MSProperty; } 4208 4209 bool hasGetter() const { return GetterId != nullptr; } 4210 IdentifierInfo* getGetterId() const { return GetterId; } 4211 bool hasSetter() const { return SetterId != nullptr; } 4212 IdentifierInfo* getSetterId() const { return SetterId; } 4213 }; 4214 4215 /// Parts of a decomposed MSGuidDecl. Factored out to avoid unnecessary 4216 /// dependencies on DeclCXX.h. 4217 struct MSGuidDeclParts { 4218 /// {01234567-... 4219 uint32_t Part1; 4220 /// ...-89ab-... 4221 uint16_t Part2; 4222 /// ...-cdef-... 4223 uint16_t Part3; 4224 /// ...-0123-456789abcdef} 4225 uint8_t Part4And5[8]; 4226 4227 uint64_t getPart4And5AsUint64() const { 4228 uint64_t Val; 4229 memcpy(&Val, &Part4And5, sizeof(Part4And5)); 4230 return Val; 4231 } 4232 }; 4233 4234 /// A global _GUID constant. These are implicitly created by UuidAttrs. 4235 /// 4236 /// struct _declspec(uuid("01234567-89ab-cdef-0123-456789abcdef")) X{}; 4237 /// 4238 /// X is a CXXRecordDecl that contains a UuidAttr that references the (unique) 4239 /// MSGuidDecl for the specified UUID. 4240 class MSGuidDecl : public ValueDecl, 4241 public Mergeable<MSGuidDecl>, 4242 public llvm::FoldingSetNode { 4243 public: 4244 using Parts = MSGuidDeclParts; 4245 4246 private: 4247 /// The decomposed form of the UUID. 4248 Parts PartVal; 4249 4250 /// The resolved value of the UUID as an APValue. Computed on demand and 4251 /// cached. 4252 mutable APValue APVal; 4253 4254 void anchor() override; 4255 4256 MSGuidDecl(DeclContext *DC, QualType T, Parts P); 4257 4258 static MSGuidDecl *Create(const ASTContext &C, QualType T, Parts P); 4259 static MSGuidDecl *CreateDeserialized(ASTContext &C, unsigned ID); 4260 4261 // Only ASTContext::getMSGuidDecl and deserialization create these. 4262 friend class ASTContext; 4263 friend class ASTReader; 4264 friend class ASTDeclReader; 4265 4266 public: 4267 /// Print this UUID in a human-readable format. 4268 void printName(llvm::raw_ostream &OS, 4269 const PrintingPolicy &Policy) const override; 4270 4271 /// Get the decomposed parts of this declaration. 4272 Parts getParts() const { return PartVal; } 4273 4274 /// Get the value of this MSGuidDecl as an APValue. This may fail and return 4275 /// an absent APValue if the type of the declaration is not of the expected 4276 /// shape. 4277 APValue &getAsAPValue() const; 4278 4279 static void Profile(llvm::FoldingSetNodeID &ID, Parts P) { 4280 ID.AddInteger(P.Part1); 4281 ID.AddInteger(P.Part2); 4282 ID.AddInteger(P.Part3); 4283 ID.AddInteger(P.getPart4And5AsUint64()); 4284 } 4285 void Profile(llvm::FoldingSetNodeID &ID) { Profile(ID, PartVal); } 4286 4287 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 4288 static bool classofKind(Kind K) { return K == Decl::MSGuid; } 4289 }; 4290 4291 /// An artificial decl, representing a global anonymous constant value which is 4292 /// uniquified by value within a translation unit. 4293 /// 4294 /// These is currently only used to back the LValue returned by 4295 /// __builtin_source_location, but could potentially be used for other similar 4296 /// situations in the future. 4297 class UnnamedGlobalConstantDecl : public ValueDecl, 4298 public Mergeable<UnnamedGlobalConstantDecl>, 4299 public llvm::FoldingSetNode { 4300 4301 // The constant value of this global. 4302 APValue Value; 4303 4304 void anchor() override; 4305 4306 UnnamedGlobalConstantDecl(const ASTContext &C, DeclContext *DC, QualType T, 4307 const APValue &Val); 4308 4309 static UnnamedGlobalConstantDecl *Create(const ASTContext &C, QualType T, 4310 const APValue &APVal); 4311 static UnnamedGlobalConstantDecl *CreateDeserialized(ASTContext &C, 4312 unsigned ID); 4313 4314 // Only ASTContext::getUnnamedGlobalConstantDecl and deserialization create 4315 // these. 4316 friend class ASTContext; 4317 friend class ASTReader; 4318 friend class ASTDeclReader; 4319 4320 public: 4321 /// Print this in a human-readable format. 4322 void printName(llvm::raw_ostream &OS, 4323 const PrintingPolicy &Policy) const override; 4324 4325 const APValue &getValue() const { return Value; } 4326 4327 static void Profile(llvm::FoldingSetNodeID &ID, QualType Ty, 4328 const APValue &APVal) { 4329 Ty.Profile(ID); 4330 APVal.Profile(ID); 4331 } 4332 void Profile(llvm::FoldingSetNodeID &ID) { 4333 Profile(ID, getType(), getValue()); 4334 } 4335 4336 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 4337 static bool classofKind(Kind K) { return K == Decl::UnnamedGlobalConstant; } 4338 }; 4339 4340 /// Insertion operator for diagnostics. This allows sending an AccessSpecifier 4341 /// into a diagnostic with <<. 4342 const StreamingDiagnostic &operator<<(const StreamingDiagnostic &DB, 4343 AccessSpecifier AS); 4344 4345 } // namespace clang 4346 4347 #endif // LLVM_CLANG_AST_DECLCXX_H 4348