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/ASTContext.h" 19#include "clang/AST/ASTUnresolvedSet.h" 20#include "clang/AST/Decl.h" 21#include "clang/AST/DeclBase.h" 22#include "clang/AST/DeclarationName.h" 23#include "clang/AST/Expr.h" 24#include "clang/AST/ExternalASTSource.h" 25#include "clang/AST/LambdaCapture.h" 26#include "clang/AST/NestedNameSpecifier.h" 27#include "clang/AST/Redeclarable.h" 28#include "clang/AST/Stmt.h" 29#include "clang/AST/Type.h" 30#include "clang/AST/TypeLoc.h" 31#include "clang/AST/UnresolvedSet.h" 32#include "clang/Basic/LLVM.h" 33#include "clang/Basic/Lambda.h" 34#include "clang/Basic/LangOptions.h" 35#include "clang/Basic/OperatorKinds.h" 36#include "clang/Basic/SourceLocation.h" 37#include "clang/Basic/Specifiers.h" 38#include "llvm/ADT/ArrayRef.h" 39#include "llvm/ADT/DenseMap.h" 40#include "llvm/ADT/PointerIntPair.h" 41#include "llvm/ADT/PointerUnion.h" 42#include "llvm/ADT/STLExtras.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 54namespace clang { 55 56class ClassTemplateDecl; 57class ConstructorUsingShadowDecl; 58class CXXBasePath; 59class CXXBasePaths; 60class CXXConstructorDecl; 61class CXXDestructorDecl; 62class CXXFinalOverriderMap; 63class CXXIndirectPrimaryBaseSet; 64class CXXMethodDecl; 65class DecompositionDecl; 66class DiagnosticBuilder; 67class FriendDecl; 68class FunctionTemplateDecl; 69class IdentifierInfo; 70class MemberSpecializationInfo; 71class TemplateDecl; 72class TemplateParameterList; 73class UsingDecl; 74 75/// Represents an access specifier followed by colon ':'. 76/// 77/// An objects of this class represents sugar for the syntactic occurrence 78/// of an access specifier followed by a colon in the list of member 79/// specifiers of a C++ class definition. 80/// 81/// Note that they do not represent other uses of access specifiers, 82/// such as those occurring in a list of base specifiers. 83/// Also note that this class has nothing to do with so-called 84/// "access declarations" (C++98 11.3 [class.access.dcl]). 85class AccessSpecDecl : public Decl { 86 /// The location of the ':'. 87 SourceLocation ColonLoc; 88 89 AccessSpecDecl(AccessSpecifier AS, DeclContext *DC, 90 SourceLocation ASLoc, SourceLocation ColonLoc) 91 : Decl(AccessSpec, DC, ASLoc), ColonLoc(ColonLoc) { 92 setAccess(AS); 93 } 94 95 AccessSpecDecl(EmptyShell Empty) : Decl(AccessSpec, Empty) {} 96 97 virtual void anchor(); 98 99public: 100 /// The location of the access specifier. 101 SourceLocation getAccessSpecifierLoc() const { return getLocation(); } 102 103 /// Sets the location of the access specifier. 104 void setAccessSpecifierLoc(SourceLocation ASLoc) { setLocation(ASLoc); } 105 106 /// The location of the colon following the access specifier. 107 SourceLocation getColonLoc() const { return ColonLoc; } 108 109 /// Sets the location of the colon. 110 void setColonLoc(SourceLocation CLoc) { ColonLoc = CLoc; } 111 112 SourceRange getSourceRange() const override LLVM_READONLY { 113 return SourceRange(getAccessSpecifierLoc(), getColonLoc()); 114 } 115 116 static AccessSpecDecl *Create(ASTContext &C, AccessSpecifier AS, 117 DeclContext *DC, SourceLocation ASLoc, 118 SourceLocation ColonLoc) { 119 return new (C, DC) AccessSpecDecl(AS, DC, ASLoc, ColonLoc); 120 } 121 122 static AccessSpecDecl *CreateDeserialized(ASTContext &C, unsigned ID); 123 124 // Implement isa/cast/dyncast/etc. 125 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 126 static bool classofKind(Kind K) { return K == AccessSpec; } 127}; 128 129/// Represents a base class of a C++ class. 130/// 131/// Each CXXBaseSpecifier represents a single, direct base class (or 132/// struct) of a C++ class (or struct). It specifies the type of that 133/// base class, whether it is a virtual or non-virtual base, and what 134/// level of access (public, protected, private) is used for the 135/// derivation. For example: 136/// 137/// \code 138/// class A { }; 139/// class B { }; 140/// class C : public virtual A, protected B { }; 141/// \endcode 142/// 143/// In this code, C will have two CXXBaseSpecifiers, one for "public 144/// virtual A" and the other for "protected B". 145class CXXBaseSpecifier { 146 /// The source code range that covers the full base 147 /// specifier, including the "virtual" (if present) and access 148 /// specifier (if present). 149 SourceRange Range; 150 151 /// The source location of the ellipsis, if this is a pack 152 /// expansion. 153 SourceLocation EllipsisLoc; 154 155 /// Whether this is a virtual base class or not. 156 unsigned Virtual : 1; 157 158 /// Whether this is the base of a class (true) or of a struct (false). 159 /// 160 /// This determines the mapping from the access specifier as written in the 161 /// source code to the access specifier used for semantic analysis. 162 unsigned BaseOfClass : 1; 163 164 /// Access specifier as written in the source code (may be AS_none). 165 /// 166 /// The actual type of data stored here is an AccessSpecifier, but we use 167 /// "unsigned" here to work around a VC++ bug. 168 unsigned Access : 2; 169 170 /// Whether the class contains a using declaration 171 /// to inherit the named class's constructors. 172 unsigned InheritConstructors : 1; 173 174 /// The type of the base class. 175 /// 176 /// This will be a class or struct (or a typedef of such). The source code 177 /// range does not include the \c virtual or the access specifier. 178 TypeSourceInfo *BaseTypeInfo; 179 180public: 181 CXXBaseSpecifier() = default; 182 CXXBaseSpecifier(SourceRange R, bool V, bool BC, AccessSpecifier A, 183 TypeSourceInfo *TInfo, SourceLocation EllipsisLoc) 184 : Range(R), EllipsisLoc(EllipsisLoc), Virtual(V), BaseOfClass(BC), 185 Access(A), InheritConstructors(false), BaseTypeInfo(TInfo) {} 186 187 /// Retrieves the source range that contains the entire base specifier. 188 SourceRange getSourceRange() const LLVM_READONLY { return Range; } 189 SourceLocation getBeginLoc() const LLVM_READONLY { return Range.getBegin(); } 190 SourceLocation getEndLoc() const LLVM_READONLY { return Range.getEnd(); } 191 192 /// Get the location at which the base class type was written. 193 SourceLocation getBaseTypeLoc() const LLVM_READONLY { 194 return BaseTypeInfo->getTypeLoc().getBeginLoc(); 195 } 196 197 /// Determines whether the base class is a virtual base class (or not). 198 bool isVirtual() const { return Virtual; } 199 200 /// Determine whether this base class is a base of a class declared 201 /// with the 'class' keyword (vs. one declared with the 'struct' keyword). 202 bool isBaseOfClass() const { return BaseOfClass; } 203 204 /// Determine whether this base specifier is a pack expansion. 205 bool isPackExpansion() const { return EllipsisLoc.isValid(); } 206 207 /// Determine whether this base class's constructors get inherited. 208 bool getInheritConstructors() const { return InheritConstructors; } 209 210 /// Set that this base class's constructors should be inherited. 211 void setInheritConstructors(bool Inherit = true) { 212 InheritConstructors = Inherit; 213 } 214 215 /// For a pack expansion, determine the location of the ellipsis. 216 SourceLocation getEllipsisLoc() const { 217 return EllipsisLoc; 218 } 219 220 /// Returns the access specifier for this base specifier. 221 /// 222 /// This is the actual base specifier as used for semantic analysis, so 223 /// the result can never be AS_none. To retrieve the access specifier as 224 /// written in the source code, use getAccessSpecifierAsWritten(). 225 AccessSpecifier getAccessSpecifier() const { 226 if ((AccessSpecifier)Access == AS_none) 227 return BaseOfClass? AS_private : AS_public; 228 else 229 return (AccessSpecifier)Access; 230 } 231 232 /// Retrieves the access specifier as written in the source code 233 /// (which may mean that no access specifier was explicitly written). 234 /// 235 /// Use getAccessSpecifier() to retrieve the access specifier for use in 236 /// semantic analysis. 237 AccessSpecifier getAccessSpecifierAsWritten() const { 238 return (AccessSpecifier)Access; 239 } 240 241 /// Retrieves the type of the base class. 242 /// 243 /// This type will always be an unqualified class type. 244 QualType getType() const { 245 return BaseTypeInfo->getType().getUnqualifiedType(); 246 } 247 248 /// Retrieves the type and source location of the base class. 249 TypeSourceInfo *getTypeSourceInfo() const { return BaseTypeInfo; } 250}; 251 252/// Represents a C++ struct/union/class. 253class CXXRecordDecl : public RecordDecl { 254 friend class ASTDeclReader; 255 friend class ASTDeclWriter; 256 friend class ASTNodeImporter; 257 friend class ASTReader; 258 friend class ASTRecordWriter; 259 friend class ASTWriter; 260 friend class DeclContext; 261 friend class LambdaExpr; 262 263 friend void FunctionDecl::setPure(bool); 264 friend void TagDecl::startDefinition(); 265 266 /// Values used in DefinitionData fields to represent special members. 267 enum SpecialMemberFlags { 268 SMF_DefaultConstructor = 0x1, 269 SMF_CopyConstructor = 0x2, 270 SMF_MoveConstructor = 0x4, 271 SMF_CopyAssignment = 0x8, 272 SMF_MoveAssignment = 0x10, 273 SMF_Destructor = 0x20, 274 SMF_All = 0x3f 275 }; 276 277 struct DefinitionData { 278 #define FIELD(Name, Width, Merge) \ 279 unsigned Name : Width; 280 #include "CXXRecordDeclDefinitionBits.def" 281 282 /// Whether this class describes a C++ lambda. 283 unsigned IsLambda : 1; 284 285 /// Whether we are currently parsing base specifiers. 286 unsigned IsParsingBaseSpecifiers : 1; 287 288 /// True when visible conversion functions are already computed 289 /// and are available. 290 unsigned ComputedVisibleConversions : 1; 291 292 unsigned HasODRHash : 1; 293 294 /// A hash of parts of the class to help in ODR checking. 295 unsigned ODRHash = 0; 296 297 /// The number of base class specifiers in Bases. 298 unsigned NumBases = 0; 299 300 /// The number of virtual base class specifiers in VBases. 301 unsigned NumVBases = 0; 302 303 /// Base classes of this class. 304 /// 305 /// FIXME: This is wasted space for a union. 306 LazyCXXBaseSpecifiersPtr Bases; 307 308 /// direct and indirect virtual base classes of this class. 309 LazyCXXBaseSpecifiersPtr VBases; 310 311 /// The conversion functions of this C++ class (but not its 312 /// inherited conversion functions). 313 /// 314 /// Each of the entries in this overload set is a CXXConversionDecl. 315 LazyASTUnresolvedSet Conversions; 316 317 /// The conversion functions of this C++ class and all those 318 /// inherited conversion functions that are visible in this class. 319 /// 320 /// Each of the entries in this overload set is a CXXConversionDecl or a 321 /// FunctionTemplateDecl. 322 LazyASTUnresolvedSet VisibleConversions; 323 324 /// The declaration which defines this record. 325 CXXRecordDecl *Definition; 326 327 /// The first friend declaration in this class, or null if there 328 /// aren't any. 329 /// 330 /// This is actually currently stored in reverse order. 331 LazyDeclPtr FirstFriend; 332 333 DefinitionData(CXXRecordDecl *D); 334 335 /// Retrieve the set of direct base classes. 336 CXXBaseSpecifier *getBases() const { 337 if (!Bases.isOffset()) 338 return Bases.get(nullptr); 339 return getBasesSlowCase(); 340 } 341 342 /// Retrieve the set of virtual base classes. 343 CXXBaseSpecifier *getVBases() const { 344 if (!VBases.isOffset()) 345 return VBases.get(nullptr); 346 return getVBasesSlowCase(); 347 } 348 349 ArrayRef<CXXBaseSpecifier> bases() const { 350 return llvm::makeArrayRef(getBases(), NumBases); 351 } 352 353 ArrayRef<CXXBaseSpecifier> vbases() const { 354 return llvm::makeArrayRef(getVBases(), NumVBases); 355 } 356 357 private: 358 CXXBaseSpecifier *getBasesSlowCase() const; 359 CXXBaseSpecifier *getVBasesSlowCase() const; 360 }; 361 362 struct DefinitionData *DefinitionData; 363 364 /// Describes a C++ closure type (generated by a lambda expression). 365 struct LambdaDefinitionData : public DefinitionData { 366 using Capture = LambdaCapture; 367 368 /// Whether this lambda is known to be dependent, even if its 369 /// context isn't dependent. 370 /// 371 /// A lambda with a non-dependent context can be dependent if it occurs 372 /// within the default argument of a function template, because the 373 /// lambda will have been created with the enclosing context as its 374 /// declaration context, rather than function. This is an unfortunate 375 /// artifact of having to parse the default arguments before. 376 unsigned Dependent : 1; 377 378 /// Whether this lambda is a generic lambda. 379 unsigned IsGenericLambda : 1; 380 381 /// The Default Capture. 382 unsigned CaptureDefault : 2; 383 384 /// The number of captures in this lambda is limited 2^NumCaptures. 385 unsigned NumCaptures : 15; 386 387 /// The number of explicit captures in this lambda. 388 unsigned NumExplicitCaptures : 13; 389 390 /// Has known `internal` linkage. 391 unsigned HasKnownInternalLinkage : 1; 392 393 /// The number used to indicate this lambda expression for name 394 /// mangling in the Itanium C++ ABI. 395 unsigned ManglingNumber : 31; 396 397 /// The declaration that provides context for this lambda, if the 398 /// actual DeclContext does not suffice. This is used for lambdas that 399 /// occur within default arguments of function parameters within the class 400 /// or within a data member initializer. 401 LazyDeclPtr ContextDecl; 402 403 /// The list of captures, both explicit and implicit, for this 404 /// lambda. 405 Capture *Captures = nullptr; 406 407 /// The type of the call method. 408 TypeSourceInfo *MethodTyInfo; 409 410 LambdaDefinitionData(CXXRecordDecl *D, TypeSourceInfo *Info, bool Dependent, 411 bool IsGeneric, LambdaCaptureDefault CaptureDefault) 412 : DefinitionData(D), Dependent(Dependent), IsGenericLambda(IsGeneric), 413 CaptureDefault(CaptureDefault), NumCaptures(0), 414 NumExplicitCaptures(0), HasKnownInternalLinkage(0), ManglingNumber(0), 415 MethodTyInfo(Info) { 416 IsLambda = true; 417 418 // C++1z [expr.prim.lambda]p4: 419 // This class type is not an aggregate type. 420 Aggregate = false; 421 PlainOldData = false; 422 } 423 }; 424 425 struct DefinitionData *dataPtr() const { 426 // Complete the redecl chain (if necessary). 427 getMostRecentDecl(); 428 return DefinitionData; 429 } 430 431 struct DefinitionData &data() const { 432 auto *DD = dataPtr(); 433 assert(DD && "queried property of class with no definition"); 434 return *DD; 435 } 436 437 struct LambdaDefinitionData &getLambdaData() const { 438 // No update required: a merged definition cannot change any lambda 439 // properties. 440 auto *DD = DefinitionData; 441 assert(DD && DD->IsLambda && "queried lambda property of non-lambda class"); 442 return static_cast<LambdaDefinitionData&>(*DD); 443 } 444 445 /// The template or declaration that this declaration 446 /// describes or was instantiated from, respectively. 447 /// 448 /// For non-templates, this value will be null. For record 449 /// declarations that describe a class template, this will be a 450 /// pointer to a ClassTemplateDecl. For member 451 /// classes of class template specializations, this will be the 452 /// MemberSpecializationInfo referring to the member class that was 453 /// instantiated or specialized. 454 llvm::PointerUnion<ClassTemplateDecl *, MemberSpecializationInfo *> 455 TemplateOrInstantiation; 456 457 /// Called from setBases and addedMember to notify the class that a 458 /// direct or virtual base class or a member of class type has been added. 459 void addedClassSubobject(CXXRecordDecl *Base); 460 461 /// Notify the class that member has been added. 462 /// 463 /// This routine helps maintain information about the class based on which 464 /// members have been added. It will be invoked by DeclContext::addDecl() 465 /// whenever a member is added to this record. 466 void addedMember(Decl *D); 467 468 void markedVirtualFunctionPure(); 469 470 /// Get the head of our list of friend declarations, possibly 471 /// deserializing the friends from an external AST source. 472 FriendDecl *getFirstFriend() const; 473 474 /// Determine whether this class has an empty base class subobject of type X 475 /// or of one of the types that might be at offset 0 within X (per the C++ 476 /// "standard layout" rules). 477 bool hasSubobjectAtOffsetZeroOfEmptyBaseType(ASTContext &Ctx, 478 const CXXRecordDecl *X); 479 480protected: 481 CXXRecordDecl(Kind K, TagKind TK, const ASTContext &C, DeclContext *DC, 482 SourceLocation StartLoc, SourceLocation IdLoc, 483 IdentifierInfo *Id, CXXRecordDecl *PrevDecl); 484 485public: 486 /// Iterator that traverses the base classes of a class. 487 using base_class_iterator = CXXBaseSpecifier *; 488 489 /// Iterator that traverses the base classes of a class. 490 using base_class_const_iterator = const CXXBaseSpecifier *; 491 492 CXXRecordDecl *getCanonicalDecl() override { 493 return cast<CXXRecordDecl>(RecordDecl::getCanonicalDecl()); 494 } 495 496 const CXXRecordDecl *getCanonicalDecl() const { 497 return const_cast<CXXRecordDecl*>(this)->getCanonicalDecl(); 498 } 499 500 CXXRecordDecl *getPreviousDecl() { 501 return cast_or_null<CXXRecordDecl>( 502 static_cast<RecordDecl *>(this)->getPreviousDecl()); 503 } 504 505 const CXXRecordDecl *getPreviousDecl() const { 506 return const_cast<CXXRecordDecl*>(this)->getPreviousDecl(); 507 } 508 509 CXXRecordDecl *getMostRecentDecl() { 510 return cast<CXXRecordDecl>( 511 static_cast<RecordDecl *>(this)->getMostRecentDecl()); 512 } 513 514 const CXXRecordDecl *getMostRecentDecl() const { 515 return const_cast<CXXRecordDecl*>(this)->getMostRecentDecl(); 516 } 517 518 CXXRecordDecl *getMostRecentNonInjectedDecl() { 519 CXXRecordDecl *Recent = 520 static_cast<CXXRecordDecl *>(this)->getMostRecentDecl(); 521 while (Recent->isInjectedClassName()) { 522 // FIXME: Does injected class name need to be in the redeclarations chain? 523 assert(Recent->getPreviousDecl()); 524 Recent = Recent->getPreviousDecl(); 525 } 526 return Recent; 527 } 528 529 const CXXRecordDecl *getMostRecentNonInjectedDecl() const { 530 return const_cast<CXXRecordDecl*>(this)->getMostRecentNonInjectedDecl(); 531 } 532 533 CXXRecordDecl *getDefinition() const { 534 // We only need an update if we don't already know which 535 // declaration is the definition. 536 auto *DD = DefinitionData ? DefinitionData : dataPtr(); 537 return DD ? DD->Definition : nullptr; 538 } 539 540 bool hasDefinition() const { return DefinitionData || dataPtr(); } 541 542 static CXXRecordDecl *Create(const ASTContext &C, TagKind TK, DeclContext *DC, 543 SourceLocation StartLoc, SourceLocation IdLoc, 544 IdentifierInfo *Id, 545 CXXRecordDecl *PrevDecl = nullptr, 546 bool DelayTypeCreation = false); 547 static CXXRecordDecl *CreateLambda(const ASTContext &C, DeclContext *DC, 548 TypeSourceInfo *Info, SourceLocation Loc, 549 bool DependentLambda, bool IsGeneric, 550 LambdaCaptureDefault CaptureDefault); 551 static CXXRecordDecl *CreateDeserialized(const ASTContext &C, unsigned ID); 552 553 bool isDynamicClass() const { 554 return data().Polymorphic || data().NumVBases != 0; 555 } 556 557 /// @returns true if class is dynamic or might be dynamic because the 558 /// definition is incomplete of dependent. 559 bool mayBeDynamicClass() const { 560 return !hasDefinition() || isDynamicClass() || hasAnyDependentBases(); 561 } 562 563 /// @returns true if class is non dynamic or might be non dynamic because the 564 /// definition is incomplete of dependent. 565 bool mayBeNonDynamicClass() const { 566 return !hasDefinition() || !isDynamicClass() || hasAnyDependentBases(); 567 } 568 569 void setIsParsingBaseSpecifiers() { data().IsParsingBaseSpecifiers = true; } 570 571 bool isParsingBaseSpecifiers() const { 572 return data().IsParsingBaseSpecifiers; 573 } 574 575 unsigned getODRHash() const; 576 577 /// Sets the base classes of this struct or class. 578 void setBases(CXXBaseSpecifier const * const *Bases, unsigned NumBases); 579 580 /// Retrieves the number of base classes of this class. 581 unsigned getNumBases() const { return data().NumBases; } 582 583 using base_class_range = llvm::iterator_range<base_class_iterator>; 584 using base_class_const_range = 585 llvm::iterator_range<base_class_const_iterator>; 586 587 base_class_range bases() { 588 return base_class_range(bases_begin(), bases_end()); 589 } 590 base_class_const_range bases() const { 591 return base_class_const_range(bases_begin(), bases_end()); 592 } 593 594 base_class_iterator bases_begin() { return data().getBases(); } 595 base_class_const_iterator bases_begin() const { return data().getBases(); } 596 base_class_iterator bases_end() { return bases_begin() + data().NumBases; } 597 base_class_const_iterator bases_end() const { 598 return bases_begin() + data().NumBases; 599 } 600 601 /// Retrieves the number of virtual base classes of this class. 602 unsigned getNumVBases() const { return data().NumVBases; } 603 604 base_class_range vbases() { 605 return base_class_range(vbases_begin(), vbases_end()); 606 } 607 base_class_const_range vbases() const { 608 return base_class_const_range(vbases_begin(), vbases_end()); 609 } 610 611 base_class_iterator vbases_begin() { return data().getVBases(); } 612 base_class_const_iterator vbases_begin() const { return data().getVBases(); } 613 base_class_iterator vbases_end() { return vbases_begin() + data().NumVBases; } 614 base_class_const_iterator vbases_end() const { 615 return vbases_begin() + data().NumVBases; 616 } 617 618 /// Determine whether this class has any dependent base classes which 619 /// are not the current instantiation. 620 bool hasAnyDependentBases() const; 621 622 /// Iterator access to method members. The method iterator visits 623 /// all method members of the class, including non-instance methods, 624 /// special methods, etc. 625 using method_iterator = specific_decl_iterator<CXXMethodDecl>; 626 using method_range = 627 llvm::iterator_range<specific_decl_iterator<CXXMethodDecl>>; 628 629 method_range methods() const { 630 return method_range(method_begin(), method_end()); 631 } 632 633 /// Method begin iterator. Iterates in the order the methods 634 /// were declared. 635 method_iterator method_begin() const { 636 return method_iterator(decls_begin()); 637 } 638 639 /// Method past-the-end iterator. 640 method_iterator method_end() const { 641 return method_iterator(decls_end()); 642 } 643 644 /// Iterator access to constructor members. 645 using ctor_iterator = specific_decl_iterator<CXXConstructorDecl>; 646 using ctor_range = 647 llvm::iterator_range<specific_decl_iterator<CXXConstructorDecl>>; 648 649 ctor_range ctors() const { return ctor_range(ctor_begin(), ctor_end()); } 650 651 ctor_iterator ctor_begin() const { 652 return ctor_iterator(decls_begin()); 653 } 654 655 ctor_iterator ctor_end() const { 656 return ctor_iterator(decls_end()); 657 } 658 659 /// An iterator over friend declarations. All of these are defined 660 /// in DeclFriend.h. 661 class friend_iterator; 662 using friend_range = llvm::iterator_range<friend_iterator>; 663 664 friend_range friends() const; 665 friend_iterator friend_begin() const; 666 friend_iterator friend_end() const; 667 void pushFriendDecl(FriendDecl *FD); 668 669 /// Determines whether this record has any friends. 670 bool hasFriends() const { 671 return data().FirstFriend.isValid(); 672 } 673 674 /// \c true if a defaulted copy constructor for this class would be 675 /// deleted. 676 bool defaultedCopyConstructorIsDeleted() const { 677 assert((!needsOverloadResolutionForCopyConstructor() || 678 (data().DeclaredSpecialMembers & SMF_CopyConstructor)) && 679 "this property has not yet been computed by Sema"); 680 return data().DefaultedCopyConstructorIsDeleted; 681 } 682 683 /// \c true if a defaulted move constructor for this class would be 684 /// deleted. 685 bool defaultedMoveConstructorIsDeleted() const { 686 assert((!needsOverloadResolutionForMoveConstructor() || 687 (data().DeclaredSpecialMembers & SMF_MoveConstructor)) && 688 "this property has not yet been computed by Sema"); 689 return data().DefaultedMoveConstructorIsDeleted; 690 } 691 692 /// \c true if a defaulted destructor for this class would be deleted. 693 bool defaultedDestructorIsDeleted() const { 694 assert((!needsOverloadResolutionForDestructor() || 695 (data().DeclaredSpecialMembers & SMF_Destructor)) && 696 "this property has not yet been computed by Sema"); 697 return data().DefaultedDestructorIsDeleted; 698 } 699 700 /// \c true if we know for sure that this class has a single, 701 /// accessible, unambiguous copy constructor that is not deleted. 702 bool hasSimpleCopyConstructor() const { 703 return !hasUserDeclaredCopyConstructor() && 704 !data().DefaultedCopyConstructorIsDeleted; 705 } 706 707 /// \c true if we know for sure that this class has a single, 708 /// accessible, unambiguous move constructor that is not deleted. 709 bool hasSimpleMoveConstructor() const { 710 return !hasUserDeclaredMoveConstructor() && hasMoveConstructor() && 711 !data().DefaultedMoveConstructorIsDeleted; 712 } 713 714 /// \c true if we know for sure that this class has a single, 715 /// accessible, unambiguous move assignment operator that is not deleted. 716 bool hasSimpleMoveAssignment() const { 717 return !hasUserDeclaredMoveAssignment() && hasMoveAssignment() && 718 !data().DefaultedMoveAssignmentIsDeleted; 719 } 720 721 /// \c true if we know for sure that this class has an accessible 722 /// destructor that is not deleted. 723 bool hasSimpleDestructor() const { 724 return !hasUserDeclaredDestructor() && 725 !data().DefaultedDestructorIsDeleted; 726 } 727 728 /// Determine whether this class has any default constructors. 729 bool hasDefaultConstructor() const { 730 return (data().DeclaredSpecialMembers & SMF_DefaultConstructor) || 731 needsImplicitDefaultConstructor(); 732 } 733 734 /// Determine if we need to declare a default constructor for 735 /// this class. 736 /// 737 /// This value is used for lazy creation of default constructors. 738 bool needsImplicitDefaultConstructor() const { 739 return !data().UserDeclaredConstructor && 740 !(data().DeclaredSpecialMembers & SMF_DefaultConstructor) && 741 (!isLambda() || lambdaIsDefaultConstructibleAndAssignable()); 742 } 743 744 /// Determine whether this class has any user-declared constructors. 745 /// 746 /// When true, a default constructor will not be implicitly declared. 747 bool hasUserDeclaredConstructor() const { 748 return data().UserDeclaredConstructor; 749 } 750 751 /// Whether this class has a user-provided default constructor 752 /// per C++11. 753 bool hasUserProvidedDefaultConstructor() const { 754 return data().UserProvidedDefaultConstructor; 755 } 756 757 /// Determine whether this class has a user-declared copy constructor. 758 /// 759 /// When false, a copy constructor will be implicitly declared. 760 bool hasUserDeclaredCopyConstructor() const { 761 return data().UserDeclaredSpecialMembers & SMF_CopyConstructor; 762 } 763 764 /// Determine whether this class needs an implicit copy 765 /// constructor to be lazily declared. 766 bool needsImplicitCopyConstructor() const { 767 return !(data().DeclaredSpecialMembers & SMF_CopyConstructor); 768 } 769 770 /// Determine whether we need to eagerly declare a defaulted copy 771 /// constructor for this class. 772 bool needsOverloadResolutionForCopyConstructor() const { 773 // C++17 [class.copy.ctor]p6: 774 // If the class definition declares a move constructor or move assignment 775 // operator, the implicitly declared copy constructor is defined as 776 // deleted. 777 // In MSVC mode, sometimes a declared move assignment does not delete an 778 // implicit copy constructor, so defer this choice to Sema. 779 if (data().UserDeclaredSpecialMembers & 780 (SMF_MoveConstructor | SMF_MoveAssignment)) 781 return true; 782 return data().NeedOverloadResolutionForCopyConstructor; 783 } 784 785 /// Determine whether an implicit copy constructor for this type 786 /// would have a parameter with a const-qualified reference type. 787 bool implicitCopyConstructorHasConstParam() const { 788 return data().ImplicitCopyConstructorCanHaveConstParamForNonVBase && 789 (isAbstract() || 790 data().ImplicitCopyConstructorCanHaveConstParamForVBase); 791 } 792 793 /// Determine whether this class has a copy constructor with 794 /// a parameter type which is a reference to a const-qualified type. 795 bool hasCopyConstructorWithConstParam() const { 796 return data().HasDeclaredCopyConstructorWithConstParam || 797 (needsImplicitCopyConstructor() && 798 implicitCopyConstructorHasConstParam()); 799 } 800 801 /// Whether this class has a user-declared move constructor or 802 /// assignment operator. 803 /// 804 /// When false, a move constructor and assignment operator may be 805 /// implicitly declared. 806 bool hasUserDeclaredMoveOperation() const { 807 return data().UserDeclaredSpecialMembers & 808 (SMF_MoveConstructor | SMF_MoveAssignment); 809 } 810 811 /// Determine whether this class has had a move constructor 812 /// declared by the user. 813 bool hasUserDeclaredMoveConstructor() const { 814 return data().UserDeclaredSpecialMembers & SMF_MoveConstructor; 815 } 816 817 /// Determine whether this class has a move constructor. 818 bool hasMoveConstructor() const { 819 return (data().DeclaredSpecialMembers & SMF_MoveConstructor) || 820 needsImplicitMoveConstructor(); 821 } 822 823 /// Set that we attempted to declare an implicit copy 824 /// constructor, but overload resolution failed so we deleted it. 825 void setImplicitCopyConstructorIsDeleted() { 826 assert((data().DefaultedCopyConstructorIsDeleted || 827 needsOverloadResolutionForCopyConstructor()) && 828 "Copy constructor should not be deleted"); 829 data().DefaultedCopyConstructorIsDeleted = true; 830 } 831 832 /// Set that we attempted to declare an implicit move 833 /// constructor, but overload resolution failed so we deleted it. 834 void setImplicitMoveConstructorIsDeleted() { 835 assert((data().DefaultedMoveConstructorIsDeleted || 836 needsOverloadResolutionForMoveConstructor()) && 837 "move constructor should not be deleted"); 838 data().DefaultedMoveConstructorIsDeleted = true; 839 } 840 841 /// Set that we attempted to declare an implicit destructor, 842 /// but overload resolution failed so we deleted it. 843 void setImplicitDestructorIsDeleted() { 844 assert((data().DefaultedDestructorIsDeleted || 845 needsOverloadResolutionForDestructor()) && 846 "destructor should not be deleted"); 847 data().DefaultedDestructorIsDeleted = true; 848 } 849 850 /// Determine whether this class should get an implicit move 851 /// constructor or if any existing special member function inhibits this. 852 bool needsImplicitMoveConstructor() const { 853 return !(data().DeclaredSpecialMembers & SMF_MoveConstructor) && 854 !hasUserDeclaredCopyConstructor() && 855 !hasUserDeclaredCopyAssignment() && 856 !hasUserDeclaredMoveAssignment() && 857 !hasUserDeclaredDestructor(); 858 } 859 860 /// Determine whether we need to eagerly declare a defaulted move 861 /// constructor for this class. 862 bool needsOverloadResolutionForMoveConstructor() const { 863 return data().NeedOverloadResolutionForMoveConstructor; 864 } 865 866 /// Determine whether this class has a user-declared copy assignment 867 /// operator. 868 /// 869 /// When false, a copy assignment operator will be implicitly declared. 870 bool hasUserDeclaredCopyAssignment() const { 871 return data().UserDeclaredSpecialMembers & SMF_CopyAssignment; 872 } 873 874 /// Determine whether this class needs an implicit copy 875 /// assignment operator to be lazily declared. 876 bool needsImplicitCopyAssignment() const { 877 return !(data().DeclaredSpecialMembers & SMF_CopyAssignment); 878 } 879 880 /// Determine whether we need to eagerly declare a defaulted copy 881 /// assignment operator for this class. 882 bool needsOverloadResolutionForCopyAssignment() const { 883 return data().HasMutableFields; 884 } 885 886 /// Determine whether an implicit copy assignment operator for this 887 /// type would have a parameter with a const-qualified reference type. 888 bool implicitCopyAssignmentHasConstParam() const { 889 return data().ImplicitCopyAssignmentHasConstParam; 890 } 891 892 /// Determine whether this class has a copy assignment operator with 893 /// a parameter type which is a reference to a const-qualified type or is not 894 /// a reference. 895 bool hasCopyAssignmentWithConstParam() const { 896 return data().HasDeclaredCopyAssignmentWithConstParam || 897 (needsImplicitCopyAssignment() && 898 implicitCopyAssignmentHasConstParam()); 899 } 900 901 /// Determine whether this class has had a move assignment 902 /// declared by the user. 903 bool hasUserDeclaredMoveAssignment() const { 904 return data().UserDeclaredSpecialMembers & SMF_MoveAssignment; 905 } 906 907 /// Determine whether this class has a move assignment operator. 908 bool hasMoveAssignment() const { 909 return (data().DeclaredSpecialMembers & SMF_MoveAssignment) || 910 needsImplicitMoveAssignment(); 911 } 912 913 /// Set that we attempted to declare an implicit move assignment 914 /// operator, but overload resolution failed so we deleted it. 915 void setImplicitMoveAssignmentIsDeleted() { 916 assert((data().DefaultedMoveAssignmentIsDeleted || 917 needsOverloadResolutionForMoveAssignment()) && 918 "move assignment should not be deleted"); 919 data().DefaultedMoveAssignmentIsDeleted = true; 920 } 921 922 /// Determine whether this class should get an implicit move 923 /// assignment operator or if any existing special member function inhibits 924 /// this. 925 bool needsImplicitMoveAssignment() const { 926 return !(data().DeclaredSpecialMembers & SMF_MoveAssignment) && 927 !hasUserDeclaredCopyConstructor() && 928 !hasUserDeclaredCopyAssignment() && 929 !hasUserDeclaredMoveConstructor() && 930 !hasUserDeclaredDestructor() && 931 (!isLambda() || lambdaIsDefaultConstructibleAndAssignable()); 932 } 933 934 /// Determine whether we need to eagerly declare a move assignment 935 /// operator for this class. 936 bool needsOverloadResolutionForMoveAssignment() const { 937 return data().NeedOverloadResolutionForMoveAssignment; 938 } 939 940 /// Determine whether this class has a user-declared destructor. 941 /// 942 /// When false, a destructor will be implicitly declared. 943 bool hasUserDeclaredDestructor() const { 944 return data().UserDeclaredSpecialMembers & SMF_Destructor; 945 } 946 947 /// Determine whether this class needs an implicit destructor to 948 /// be lazily declared. 949 bool needsImplicitDestructor() const { 950 return !(data().DeclaredSpecialMembers & SMF_Destructor); 951 } 952 953 /// Determine whether we need to eagerly declare a destructor for this 954 /// class. 955 bool needsOverloadResolutionForDestructor() const { 956 return data().NeedOverloadResolutionForDestructor; 957 } 958 959 /// Determine whether this class describes a lambda function object. 960 bool isLambda() const { 961 // An update record can't turn a non-lambda into a lambda. 962 auto *DD = DefinitionData; 963 return DD && DD->IsLambda; 964 } 965 966 /// Determine whether this class describes a generic 967 /// lambda function object (i.e. function call operator is 968 /// a template). 969 bool isGenericLambda() const; 970 971 /// Determine whether this lambda should have an implicit default constructor 972 /// and copy and move assignment operators. 973 bool lambdaIsDefaultConstructibleAndAssignable() const; 974 975 /// Retrieve the lambda call operator of the closure type 976 /// if this is a closure type. 977 CXXMethodDecl *getLambdaCallOperator() const; 978 979 /// Retrieve the dependent lambda call operator of the closure type 980 /// if this is a templated closure type. 981 FunctionTemplateDecl *getDependentLambdaCallOperator() const; 982 983 /// Retrieve the lambda static invoker, the address of which 984 /// is returned by the conversion operator, and the body of which 985 /// is forwarded to the lambda call operator. 986 CXXMethodDecl *getLambdaStaticInvoker() const; 987 988 /// Retrieve the generic lambda's template parameter list. 989 /// Returns null if the class does not represent a lambda or a generic 990 /// lambda. 991 TemplateParameterList *getGenericLambdaTemplateParameterList() const; 992 993 /// Retrieve the lambda template parameters that were specified explicitly. 994 ArrayRef<NamedDecl *> getLambdaExplicitTemplateParameters() const; 995 996 LambdaCaptureDefault getLambdaCaptureDefault() const { 997 assert(isLambda()); 998 return static_cast<LambdaCaptureDefault>(getLambdaData().CaptureDefault); 999 } 1000 1001 /// For a closure type, retrieve the mapping from captured 1002 /// variables and \c this to the non-static data members that store the 1003 /// values or references of the captures. 1004 /// 1005 /// \param Captures Will be populated with the mapping from captured 1006 /// variables to the corresponding fields. 1007 /// 1008 /// \param ThisCapture Will be set to the field declaration for the 1009 /// \c this capture. 1010 /// 1011 /// \note No entries will be added for init-captures, as they do not capture 1012 /// variables. 1013 void getCaptureFields(llvm::DenseMap<const VarDecl *, FieldDecl *> &Captures, 1014 FieldDecl *&ThisCapture) const; 1015 1016 using capture_const_iterator = const LambdaCapture *; 1017 using capture_const_range = llvm::iterator_range<capture_const_iterator>; 1018 1019 capture_const_range captures() const { 1020 return capture_const_range(captures_begin(), captures_end()); 1021 } 1022 1023 capture_const_iterator captures_begin() const { 1024 return isLambda() ? getLambdaData().Captures : nullptr; 1025 } 1026 1027 capture_const_iterator captures_end() const { 1028 return isLambda() ? captures_begin() + getLambdaData().NumCaptures 1029 : nullptr; 1030 } 1031 1032 using conversion_iterator = UnresolvedSetIterator; 1033 1034 conversion_iterator conversion_begin() const { 1035 return data().Conversions.get(getASTContext()).begin(); 1036 } 1037 1038 conversion_iterator conversion_end() const { 1039 return data().Conversions.get(getASTContext()).end(); 1040 } 1041 1042 /// Removes a conversion function from this class. The conversion 1043 /// function must currently be a member of this class. Furthermore, 1044 /// this class must currently be in the process of being defined. 1045 void removeConversion(const NamedDecl *Old); 1046 1047 /// Get all conversion functions visible in current class, 1048 /// including conversion function templates. 1049 llvm::iterator_range<conversion_iterator> 1050 getVisibleConversionFunctions() const; 1051 1052 /// Determine whether this class is an aggregate (C++ [dcl.init.aggr]), 1053 /// which is a class with no user-declared constructors, no private 1054 /// or protected non-static data members, no base classes, and no virtual 1055 /// functions (C++ [dcl.init.aggr]p1). 1056 bool isAggregate() const { return data().Aggregate; } 1057 1058 /// Whether this class has any in-class initializers 1059 /// for non-static data members (including those in anonymous unions or 1060 /// structs). 1061 bool hasInClassInitializer() const { return data().HasInClassInitializer; } 1062 1063 /// Whether this class or any of its subobjects has any members of 1064 /// reference type which would make value-initialization ill-formed. 1065 /// 1066 /// Per C++03 [dcl.init]p5: 1067 /// - if T is a non-union class type without a user-declared constructor, 1068 /// then every non-static data member and base-class component of T is 1069 /// value-initialized [...] A program that calls for [...] 1070 /// value-initialization of an entity of reference type is ill-formed. 1071 bool hasUninitializedReferenceMember() const { 1072 return !isUnion() && !hasUserDeclaredConstructor() && 1073 data().HasUninitializedReferenceMember; 1074 } 1075 1076 /// Whether this class is a POD-type (C++ [class]p4) 1077 /// 1078 /// For purposes of this function a class is POD if it is an aggregate 1079 /// that has no non-static non-POD data members, no reference data 1080 /// members, no user-defined copy assignment operator and no 1081 /// user-defined destructor. 1082 /// 1083 /// Note that this is the C++ TR1 definition of POD. 1084 bool isPOD() const { return data().PlainOldData; } 1085 1086 /// True if this class is C-like, without C++-specific features, e.g. 1087 /// it contains only public fields, no bases, tag kind is not 'class', etc. 1088 bool isCLike() const; 1089 1090 /// Determine whether this is an empty class in the sense of 1091 /// (C++11 [meta.unary.prop]). 1092 /// 1093 /// The CXXRecordDecl is a class type, but not a union type, 1094 /// with no non-static data members other than bit-fields of length 0, 1095 /// no virtual member functions, no virtual base classes, 1096 /// and no base class B for which is_empty<B>::value is false. 1097 /// 1098 /// \note This does NOT include a check for union-ness. 1099 bool isEmpty() const { return data().Empty; } 1100 1101 bool hasPrivateFields() const { 1102 return data().HasPrivateFields; 1103 } 1104 1105 bool hasProtectedFields() const { 1106 return data().HasProtectedFields; 1107 } 1108 1109 /// Determine whether this class has direct non-static data members. 1110 bool hasDirectFields() const { 1111 auto &D = data(); 1112 return D.HasPublicFields || D.HasProtectedFields || D.HasPrivateFields; 1113 } 1114 1115 /// Whether this class is polymorphic (C++ [class.virtual]), 1116 /// which means that the class contains or inherits a virtual function. 1117 bool isPolymorphic() const { return data().Polymorphic; } 1118 1119 /// Determine whether this class has a pure virtual function. 1120 /// 1121 /// The class is is abstract per (C++ [class.abstract]p2) if it declares 1122 /// a pure virtual function or inherits a pure virtual function that is 1123 /// not overridden. 1124 bool isAbstract() const { return data().Abstract; } 1125 1126 /// Determine whether this class is standard-layout per 1127 /// C++ [class]p7. 1128 bool isStandardLayout() const { return data().IsStandardLayout; } 1129 1130 /// Determine whether this class was standard-layout per 1131 /// C++11 [class]p7, specifically using the C++11 rules without any DRs. 1132 bool isCXX11StandardLayout() const { return data().IsCXX11StandardLayout; } 1133 1134 /// Determine whether this class, or any of its class subobjects, 1135 /// contains a mutable field. 1136 bool hasMutableFields() const { return data().HasMutableFields; } 1137 1138 /// Determine whether this class has any variant members. 1139 bool hasVariantMembers() const { return data().HasVariantMembers; } 1140 1141 /// Determine whether this class has a trivial default constructor 1142 /// (C++11 [class.ctor]p5). 1143 bool hasTrivialDefaultConstructor() const { 1144 return hasDefaultConstructor() && 1145 (data().HasTrivialSpecialMembers & SMF_DefaultConstructor); 1146 } 1147 1148 /// Determine whether this class has a non-trivial default constructor 1149 /// (C++11 [class.ctor]p5). 1150 bool hasNonTrivialDefaultConstructor() const { 1151 return (data().DeclaredNonTrivialSpecialMembers & SMF_DefaultConstructor) || 1152 (needsImplicitDefaultConstructor() && 1153 !(data().HasTrivialSpecialMembers & SMF_DefaultConstructor)); 1154 } 1155 1156 /// Determine whether this class has at least one constexpr constructor 1157 /// other than the copy or move constructors. 1158 bool hasConstexprNonCopyMoveConstructor() const { 1159 return data().HasConstexprNonCopyMoveConstructor || 1160 (needsImplicitDefaultConstructor() && 1161 defaultedDefaultConstructorIsConstexpr()); 1162 } 1163 1164 /// Determine whether a defaulted default constructor for this class 1165 /// would be constexpr. 1166 bool defaultedDefaultConstructorIsConstexpr() const { 1167 return data().DefaultedDefaultConstructorIsConstexpr && 1168 (!isUnion() || hasInClassInitializer() || !hasVariantMembers() || 1169 getASTContext().getLangOpts().CPlusPlus2a); 1170 } 1171 1172 /// Determine whether this class has a constexpr default constructor. 1173 bool hasConstexprDefaultConstructor() const { 1174 return data().HasConstexprDefaultConstructor || 1175 (needsImplicitDefaultConstructor() && 1176 defaultedDefaultConstructorIsConstexpr()); 1177 } 1178 1179 /// Determine whether this class has a trivial copy constructor 1180 /// (C++ [class.copy]p6, C++11 [class.copy]p12) 1181 bool hasTrivialCopyConstructor() const { 1182 return data().HasTrivialSpecialMembers & SMF_CopyConstructor; 1183 } 1184 1185 bool hasTrivialCopyConstructorForCall() const { 1186 return data().HasTrivialSpecialMembersForCall & SMF_CopyConstructor; 1187 } 1188 1189 /// Determine whether this class has a non-trivial copy constructor 1190 /// (C++ [class.copy]p6, C++11 [class.copy]p12) 1191 bool hasNonTrivialCopyConstructor() const { 1192 return data().DeclaredNonTrivialSpecialMembers & SMF_CopyConstructor || 1193 !hasTrivialCopyConstructor(); 1194 } 1195 1196 bool hasNonTrivialCopyConstructorForCall() const { 1197 return (data().DeclaredNonTrivialSpecialMembersForCall & 1198 SMF_CopyConstructor) || 1199 !hasTrivialCopyConstructorForCall(); 1200 } 1201 1202 /// Determine whether this class has a trivial move constructor 1203 /// (C++11 [class.copy]p12) 1204 bool hasTrivialMoveConstructor() const { 1205 return hasMoveConstructor() && 1206 (data().HasTrivialSpecialMembers & SMF_MoveConstructor); 1207 } 1208 1209 bool hasTrivialMoveConstructorForCall() const { 1210 return hasMoveConstructor() && 1211 (data().HasTrivialSpecialMembersForCall & SMF_MoveConstructor); 1212 } 1213 1214 /// Determine whether this class has a non-trivial move constructor 1215 /// (C++11 [class.copy]p12) 1216 bool hasNonTrivialMoveConstructor() const { 1217 return (data().DeclaredNonTrivialSpecialMembers & SMF_MoveConstructor) || 1218 (needsImplicitMoveConstructor() && 1219 !(data().HasTrivialSpecialMembers & SMF_MoveConstructor)); 1220 } 1221 1222 bool hasNonTrivialMoveConstructorForCall() const { 1223 return (data().DeclaredNonTrivialSpecialMembersForCall & 1224 SMF_MoveConstructor) || 1225 (needsImplicitMoveConstructor() && 1226 !(data().HasTrivialSpecialMembersForCall & SMF_MoveConstructor)); 1227 } 1228 1229 /// Determine whether this class has a trivial copy assignment operator 1230 /// (C++ [class.copy]p11, C++11 [class.copy]p25) 1231 bool hasTrivialCopyAssignment() const { 1232 return data().HasTrivialSpecialMembers & SMF_CopyAssignment; 1233 } 1234 1235 /// Determine whether this class has a non-trivial copy assignment 1236 /// operator (C++ [class.copy]p11, C++11 [class.copy]p25) 1237 bool hasNonTrivialCopyAssignment() const { 1238 return data().DeclaredNonTrivialSpecialMembers & SMF_CopyAssignment || 1239 !hasTrivialCopyAssignment(); 1240 } 1241 1242 /// Determine whether this class has a trivial move assignment operator 1243 /// (C++11 [class.copy]p25) 1244 bool hasTrivialMoveAssignment() const { 1245 return hasMoveAssignment() && 1246 (data().HasTrivialSpecialMembers & SMF_MoveAssignment); 1247 } 1248 1249 /// Determine whether this class has a non-trivial move assignment 1250 /// operator (C++11 [class.copy]p25) 1251 bool hasNonTrivialMoveAssignment() const { 1252 return (data().DeclaredNonTrivialSpecialMembers & SMF_MoveAssignment) || 1253 (needsImplicitMoveAssignment() && 1254 !(data().HasTrivialSpecialMembers & SMF_MoveAssignment)); 1255 } 1256 1257 /// Determine whether a defaulted default constructor for this class 1258 /// would be constexpr. 1259 bool defaultedDestructorIsConstexpr() const { 1260 return data().DefaultedDestructorIsConstexpr && 1261 getASTContext().getLangOpts().CPlusPlus2a; 1262 } 1263 1264 /// Determine whether this class has a constexpr destructor. 1265 bool hasConstexprDestructor() const; 1266 1267 /// Determine whether this class has a trivial destructor 1268 /// (C++ [class.dtor]p3) 1269 bool hasTrivialDestructor() const { 1270 return data().HasTrivialSpecialMembers & SMF_Destructor; 1271 } 1272 1273 bool hasTrivialDestructorForCall() const { 1274 return data().HasTrivialSpecialMembersForCall & SMF_Destructor; 1275 } 1276 1277 /// Determine whether this class has a non-trivial destructor 1278 /// (C++ [class.dtor]p3) 1279 bool hasNonTrivialDestructor() const { 1280 return !(data().HasTrivialSpecialMembers & SMF_Destructor); 1281 } 1282 1283 bool hasNonTrivialDestructorForCall() const { 1284 return !(data().HasTrivialSpecialMembersForCall & SMF_Destructor); 1285 } 1286 1287 void setHasTrivialSpecialMemberForCall() { 1288 data().HasTrivialSpecialMembersForCall = 1289 (SMF_CopyConstructor | SMF_MoveConstructor | SMF_Destructor); 1290 } 1291 1292 /// Determine whether declaring a const variable with this type is ok 1293 /// per core issue 253. 1294 bool allowConstDefaultInit() const { 1295 return !data().HasUninitializedFields || 1296 !(data().HasDefaultedDefaultConstructor || 1297 needsImplicitDefaultConstructor()); 1298 } 1299 1300 /// Determine whether this class has a destructor which has no 1301 /// semantic effect. 1302 /// 1303 /// Any such destructor will be trivial, public, defaulted and not deleted, 1304 /// and will call only irrelevant destructors. 1305 bool hasIrrelevantDestructor() const { 1306 return data().HasIrrelevantDestructor; 1307 } 1308 1309 /// Determine whether this class has a non-literal or/ volatile type 1310 /// non-static data member or base class. 1311 bool hasNonLiteralTypeFieldsOrBases() const { 1312 return data().HasNonLiteralTypeFieldsOrBases; 1313 } 1314 1315 /// Determine whether this class has a using-declaration that names 1316 /// a user-declared base class constructor. 1317 bool hasInheritedConstructor() const { 1318 return data().HasInheritedConstructor; 1319 } 1320 1321 /// Determine whether this class has a using-declaration that names 1322 /// a base class assignment operator. 1323 bool hasInheritedAssignment() const { 1324 return data().HasInheritedAssignment; 1325 } 1326 1327 /// Determine whether this class is considered trivially copyable per 1328 /// (C++11 [class]p6). 1329 bool isTriviallyCopyable() const; 1330 1331 /// Determine whether this class is considered trivial. 1332 /// 1333 /// C++11 [class]p6: 1334 /// "A trivial class is a class that has a trivial default constructor and 1335 /// is trivially copyable." 1336 bool isTrivial() const { 1337 return isTriviallyCopyable() && hasTrivialDefaultConstructor(); 1338 } 1339 1340 /// Determine whether this class is a literal type. 1341 /// 1342 /// C++11 [basic.types]p10: 1343 /// A class type that has all the following properties: 1344 /// - it has a trivial destructor 1345 /// - every constructor call and full-expression in the 1346 /// brace-or-equal-intializers for non-static data members (if any) is 1347 /// a constant expression. 1348 /// - it is an aggregate type or has at least one constexpr constructor 1349 /// or constructor template that is not a copy or move constructor, and 1350 /// - all of its non-static data members and base classes are of literal 1351 /// types 1352 /// 1353 /// We resolve DR1361 by ignoring the second bullet. We resolve DR1452 by 1354 /// treating types with trivial default constructors as literal types. 1355 /// 1356 /// Only in C++17 and beyond, are lambdas literal types. 1357 bool isLiteral() const { 1358 ASTContext &Ctx = getASTContext(); 1359 return (Ctx.getLangOpts().CPlusPlus2a ? hasConstexprDestructor() 1360 : hasTrivialDestructor()) && 1361 (!isLambda() || Ctx.getLangOpts().CPlusPlus17) && 1362 !hasNonLiteralTypeFieldsOrBases() && 1363 (isAggregate() || isLambda() || 1364 hasConstexprNonCopyMoveConstructor() || 1365 hasTrivialDefaultConstructor()); 1366 } 1367 1368 /// If this record is an instantiation of a member class, 1369 /// retrieves the member class from which it was instantiated. 1370 /// 1371 /// This routine will return non-null for (non-templated) member 1372 /// classes of class templates. For example, given: 1373 /// 1374 /// \code 1375 /// template<typename T> 1376 /// struct X { 1377 /// struct A { }; 1378 /// }; 1379 /// \endcode 1380 /// 1381 /// The declaration for X<int>::A is a (non-templated) CXXRecordDecl 1382 /// whose parent is the class template specialization X<int>. For 1383 /// this declaration, getInstantiatedFromMemberClass() will return 1384 /// the CXXRecordDecl X<T>::A. When a complete definition of 1385 /// X<int>::A is required, it will be instantiated from the 1386 /// declaration returned by getInstantiatedFromMemberClass(). 1387 CXXRecordDecl *getInstantiatedFromMemberClass() const; 1388 1389 /// If this class is an instantiation of a member class of a 1390 /// class template specialization, retrieves the member specialization 1391 /// information. 1392 MemberSpecializationInfo *getMemberSpecializationInfo() const; 1393 1394 /// Specify that this record is an instantiation of the 1395 /// member class \p RD. 1396 void setInstantiationOfMemberClass(CXXRecordDecl *RD, 1397 TemplateSpecializationKind TSK); 1398 1399 /// Retrieves the class template that is described by this 1400 /// class declaration. 1401 /// 1402 /// Every class template is represented as a ClassTemplateDecl and a 1403 /// CXXRecordDecl. The former contains template properties (such as 1404 /// the template parameter lists) while the latter contains the 1405 /// actual description of the template's 1406 /// contents. ClassTemplateDecl::getTemplatedDecl() retrieves the 1407 /// CXXRecordDecl that from a ClassTemplateDecl, while 1408 /// getDescribedClassTemplate() retrieves the ClassTemplateDecl from 1409 /// a CXXRecordDecl. 1410 ClassTemplateDecl *getDescribedClassTemplate() const; 1411 1412 void setDescribedClassTemplate(ClassTemplateDecl *Template); 1413 1414 /// Determine whether this particular class is a specialization or 1415 /// instantiation of a class template or member class of a class template, 1416 /// and how it was instantiated or specialized. 1417 TemplateSpecializationKind getTemplateSpecializationKind() const; 1418 1419 /// Set the kind of specialization or template instantiation this is. 1420 void setTemplateSpecializationKind(TemplateSpecializationKind TSK); 1421 1422 /// Retrieve the record declaration from which this record could be 1423 /// instantiated. Returns null if this class is not a template instantiation. 1424 const CXXRecordDecl *getTemplateInstantiationPattern() const; 1425 1426 CXXRecordDecl *getTemplateInstantiationPattern() { 1427 return const_cast<CXXRecordDecl *>(const_cast<const CXXRecordDecl *>(this) 1428 ->getTemplateInstantiationPattern()); 1429 } 1430 1431 /// Returns the destructor decl for this class. 1432 CXXDestructorDecl *getDestructor() const; 1433 1434 /// Returns true if the class destructor, or any implicitly invoked 1435 /// destructors are marked noreturn. 1436 bool isAnyDestructorNoReturn() const; 1437 1438 /// If the class is a local class [class.local], returns 1439 /// the enclosing function declaration. 1440 const FunctionDecl *isLocalClass() const { 1441 if (const auto *RD = dyn_cast<CXXRecordDecl>(getDeclContext())) 1442 return RD->isLocalClass(); 1443 1444 return dyn_cast<FunctionDecl>(getDeclContext()); 1445 } 1446 1447 FunctionDecl *isLocalClass() { 1448 return const_cast<FunctionDecl*>( 1449 const_cast<const CXXRecordDecl*>(this)->isLocalClass()); 1450 } 1451 1452 /// Determine whether this dependent class is a current instantiation, 1453 /// when viewed from within the given context. 1454 bool isCurrentInstantiation(const DeclContext *CurContext) const; 1455 1456 /// Determine whether this class is derived from the class \p Base. 1457 /// 1458 /// This routine only determines whether this class is derived from \p Base, 1459 /// but does not account for factors that may make a Derived -> Base class 1460 /// ill-formed, such as private/protected inheritance or multiple, ambiguous 1461 /// base class subobjects. 1462 /// 1463 /// \param Base the base class we are searching for. 1464 /// 1465 /// \returns true if this class is derived from Base, false otherwise. 1466 bool isDerivedFrom(const CXXRecordDecl *Base) const; 1467 1468 /// Determine whether this class is derived from the type \p Base. 1469 /// 1470 /// This routine only determines whether this class is derived from \p Base, 1471 /// but does not account for factors that may make a Derived -> Base class 1472 /// ill-formed, such as private/protected inheritance or multiple, ambiguous 1473 /// base class subobjects. 1474 /// 1475 /// \param Base the base class we are searching for. 1476 /// 1477 /// \param Paths will contain the paths taken from the current class to the 1478 /// given \p Base class. 1479 /// 1480 /// \returns true if this class is derived from \p Base, false otherwise. 1481 /// 1482 /// \todo add a separate parameter to configure IsDerivedFrom, rather than 1483 /// tangling input and output in \p Paths 1484 bool isDerivedFrom(const CXXRecordDecl *Base, CXXBasePaths &Paths) const; 1485 1486 /// Determine whether this class is virtually derived from 1487 /// the class \p Base. 1488 /// 1489 /// This routine only determines whether this class is virtually 1490 /// derived from \p Base, but does not account for factors that may 1491 /// make a Derived -> Base class ill-formed, such as 1492 /// private/protected inheritance or multiple, ambiguous base class 1493 /// subobjects. 1494 /// 1495 /// \param Base the base class we are searching for. 1496 /// 1497 /// \returns true if this class is virtually derived from Base, 1498 /// false otherwise. 1499 bool isVirtuallyDerivedFrom(const CXXRecordDecl *Base) const; 1500 1501 /// Determine whether this class is provably not derived from 1502 /// the type \p Base. 1503 bool isProvablyNotDerivedFrom(const CXXRecordDecl *Base) const; 1504 1505 /// Function type used by forallBases() as a callback. 1506 /// 1507 /// \param BaseDefinition the definition of the base class 1508 /// 1509 /// \returns true if this base matched the search criteria 1510 using ForallBasesCallback = 1511 llvm::function_ref<bool(const CXXRecordDecl *BaseDefinition)>; 1512 1513 /// Determines if the given callback holds for all the direct 1514 /// or indirect base classes of this type. 1515 /// 1516 /// The class itself does not count as a base class. This routine 1517 /// returns false if the class has non-computable base classes. 1518 /// 1519 /// \param BaseMatches Callback invoked for each (direct or indirect) base 1520 /// class of this type, or if \p AllowShortCircuit is true then until a call 1521 /// returns false. 1522 /// 1523 /// \param AllowShortCircuit if false, forces the callback to be called 1524 /// for every base class, even if a dependent or non-matching base was 1525 /// found. 1526 bool forallBases(ForallBasesCallback BaseMatches, 1527 bool AllowShortCircuit = true) const; 1528 1529 /// Function type used by lookupInBases() to determine whether a 1530 /// specific base class subobject matches the lookup criteria. 1531 /// 1532 /// \param Specifier the base-class specifier that describes the inheritance 1533 /// from the base class we are trying to match. 1534 /// 1535 /// \param Path the current path, from the most-derived class down to the 1536 /// base named by the \p Specifier. 1537 /// 1538 /// \returns true if this base matched the search criteria, false otherwise. 1539 using BaseMatchesCallback = 1540 llvm::function_ref<bool(const CXXBaseSpecifier *Specifier, 1541 CXXBasePath &Path)>; 1542 1543 /// Look for entities within the base classes of this C++ class, 1544 /// transitively searching all base class subobjects. 1545 /// 1546 /// This routine uses the callback function \p BaseMatches to find base 1547 /// classes meeting some search criteria, walking all base class subobjects 1548 /// and populating the given \p Paths structure with the paths through the 1549 /// inheritance hierarchy that resulted in a match. On a successful search, 1550 /// the \p Paths structure can be queried to retrieve the matching paths and 1551 /// to determine if there were any ambiguities. 1552 /// 1553 /// \param BaseMatches callback function used to determine whether a given 1554 /// base matches the user-defined search criteria. 1555 /// 1556 /// \param Paths used to record the paths from this class to its base class 1557 /// subobjects that match the search criteria. 1558 /// 1559 /// \param LookupInDependent can be set to true to extend the search to 1560 /// dependent base classes. 1561 /// 1562 /// \returns true if there exists any path from this class to a base class 1563 /// subobject that matches the search criteria. 1564 bool lookupInBases(BaseMatchesCallback BaseMatches, CXXBasePaths &Paths, 1565 bool LookupInDependent = false) const; 1566 1567 /// Base-class lookup callback that determines whether the given 1568 /// base class specifier refers to a specific class declaration. 1569 /// 1570 /// This callback can be used with \c lookupInBases() to determine whether 1571 /// a given derived class has is a base class subobject of a particular type. 1572 /// The base record pointer should refer to the canonical CXXRecordDecl of the 1573 /// base class that we are searching for. 1574 static bool FindBaseClass(const CXXBaseSpecifier *Specifier, 1575 CXXBasePath &Path, const CXXRecordDecl *BaseRecord); 1576 1577 /// Base-class lookup callback that determines whether the 1578 /// given base class specifier refers to a specific class 1579 /// declaration and describes virtual derivation. 1580 /// 1581 /// This callback can be used with \c lookupInBases() to determine 1582 /// whether a given derived class has is a virtual base class 1583 /// subobject of a particular type. The base record pointer should 1584 /// refer to the canonical CXXRecordDecl of the base class that we 1585 /// are searching for. 1586 static bool FindVirtualBaseClass(const CXXBaseSpecifier *Specifier, 1587 CXXBasePath &Path, 1588 const CXXRecordDecl *BaseRecord); 1589 1590 /// Base-class lookup callback that determines whether there exists 1591 /// a tag with the given name. 1592 /// 1593 /// This callback can be used with \c lookupInBases() to find tag members 1594 /// of the given name within a C++ class hierarchy. 1595 static bool FindTagMember(const CXXBaseSpecifier *Specifier, 1596 CXXBasePath &Path, DeclarationName Name); 1597 1598 /// Base-class lookup callback that determines whether there exists 1599 /// a member with the given name. 1600 /// 1601 /// This callback can be used with \c lookupInBases() to find members 1602 /// of the given name within a C++ class hierarchy. 1603 static bool FindOrdinaryMember(const CXXBaseSpecifier *Specifier, 1604 CXXBasePath &Path, DeclarationName Name); 1605 1606 /// Base-class lookup callback that determines whether there exists 1607 /// a member with the given name. 1608 /// 1609 /// This callback can be used with \c lookupInBases() to find members 1610 /// of the given name within a C++ class hierarchy, including dependent 1611 /// classes. 1612 static bool 1613 FindOrdinaryMemberInDependentClasses(const CXXBaseSpecifier *Specifier, 1614 CXXBasePath &Path, DeclarationName Name); 1615 1616 /// Base-class lookup callback that determines whether there exists 1617 /// an OpenMP declare reduction member with the given name. 1618 /// 1619 /// This callback can be used with \c lookupInBases() to find members 1620 /// of the given name within a C++ class hierarchy. 1621 static bool FindOMPReductionMember(const CXXBaseSpecifier *Specifier, 1622 CXXBasePath &Path, DeclarationName Name); 1623 1624 /// Base-class lookup callback that determines whether there exists 1625 /// an OpenMP declare mapper member with the given name. 1626 /// 1627 /// This callback can be used with \c lookupInBases() to find members 1628 /// of the given name within a C++ class hierarchy. 1629 static bool FindOMPMapperMember(const CXXBaseSpecifier *Specifier, 1630 CXXBasePath &Path, DeclarationName Name); 1631 1632 /// Base-class lookup callback that determines whether there exists 1633 /// a member with the given name that can be used in a nested-name-specifier. 1634 /// 1635 /// This callback can be used with \c lookupInBases() to find members of 1636 /// the given name within a C++ class hierarchy that can occur within 1637 /// nested-name-specifiers. 1638 static bool FindNestedNameSpecifierMember(const CXXBaseSpecifier *Specifier, 1639 CXXBasePath &Path, 1640 DeclarationName Name); 1641 1642 /// Retrieve the final overriders for each virtual member 1643 /// function in the class hierarchy where this class is the 1644 /// most-derived class in the class hierarchy. 1645 void getFinalOverriders(CXXFinalOverriderMap &FinaOverriders) const; 1646 1647 /// Get the indirect primary bases for this class. 1648 void getIndirectPrimaryBases(CXXIndirectPrimaryBaseSet& Bases) const; 1649 1650 /// Performs an imprecise lookup of a dependent name in this class. 1651 /// 1652 /// This function does not follow strict semantic rules and should be used 1653 /// only when lookup rules can be relaxed, e.g. indexing. 1654 std::vector<const NamedDecl *> 1655 lookupDependentName(const DeclarationName &Name, 1656 llvm::function_ref<bool(const NamedDecl *ND)> Filter); 1657 1658 /// Renders and displays an inheritance diagram 1659 /// for this C++ class and all of its base classes (transitively) using 1660 /// GraphViz. 1661 void viewInheritance(ASTContext& Context) const; 1662 1663 /// Calculates the access of a decl that is reached 1664 /// along a path. 1665 static AccessSpecifier MergeAccess(AccessSpecifier PathAccess, 1666 AccessSpecifier DeclAccess) { 1667 assert(DeclAccess != AS_none); 1668 if (DeclAccess == AS_private) return AS_none; 1669 return (PathAccess > DeclAccess ? PathAccess : DeclAccess); 1670 } 1671 1672 /// Indicates that the declaration of a defaulted or deleted special 1673 /// member function is now complete. 1674 void finishedDefaultedOrDeletedMember(CXXMethodDecl *MD); 1675 1676 void setTrivialForCallFlags(CXXMethodDecl *MD); 1677 1678 /// Indicates that the definition of this class is now complete. 1679 void completeDefinition() override; 1680 1681 /// Indicates that the definition of this class is now complete, 1682 /// and provides a final overrider map to help determine 1683 /// 1684 /// \param FinalOverriders The final overrider map for this class, which can 1685 /// be provided as an optimization for abstract-class checking. If NULL, 1686 /// final overriders will be computed if they are needed to complete the 1687 /// definition. 1688 void completeDefinition(CXXFinalOverriderMap *FinalOverriders); 1689 1690 /// Determine whether this class may end up being abstract, even though 1691 /// it is not yet known to be abstract. 1692 /// 1693 /// \returns true if this class is not known to be abstract but has any 1694 /// base classes that are abstract. In this case, \c completeDefinition() 1695 /// will need to compute final overriders to determine whether the class is 1696 /// actually abstract. 1697 bool mayBeAbstract() const; 1698 1699 /// If this is the closure type of a lambda expression, retrieve the 1700 /// number to be used for name mangling in the Itanium C++ ABI. 1701 /// 1702 /// Zero indicates that this closure type has internal linkage, so the 1703 /// mangling number does not matter, while a non-zero value indicates which 1704 /// lambda expression this is in this particular context. 1705 unsigned getLambdaManglingNumber() const { 1706 assert(isLambda() && "Not a lambda closure type!"); 1707 return getLambdaData().ManglingNumber; 1708 } 1709 1710 /// The lambda is known to has internal linkage no matter whether it has name 1711 /// mangling number. 1712 bool hasKnownLambdaInternalLinkage() const { 1713 assert(isLambda() && "Not a lambda closure type!"); 1714 return getLambdaData().HasKnownInternalLinkage; 1715 } 1716 1717 /// Retrieve the declaration that provides additional context for a 1718 /// lambda, when the normal declaration context is not specific enough. 1719 /// 1720 /// Certain contexts (default arguments of in-class function parameters and 1721 /// the initializers of data members) have separate name mangling rules for 1722 /// lambdas within the Itanium C++ ABI. For these cases, this routine provides 1723 /// the declaration in which the lambda occurs, e.g., the function parameter 1724 /// or the non-static data member. Otherwise, it returns NULL to imply that 1725 /// the declaration context suffices. 1726 Decl *getLambdaContextDecl() const; 1727 1728 /// Set the mangling number and context declaration for a lambda 1729 /// class. 1730 void setLambdaMangling(unsigned ManglingNumber, Decl *ContextDecl, 1731 bool HasKnownInternalLinkage = false) { 1732 assert(isLambda() && "Not a lambda closure type!"); 1733 getLambdaData().ManglingNumber = ManglingNumber; 1734 getLambdaData().ContextDecl = ContextDecl; 1735 getLambdaData().HasKnownInternalLinkage = HasKnownInternalLinkage; 1736 } 1737 1738 /// Returns the inheritance model used for this record. 1739 MSInheritanceModel getMSInheritanceModel() const; 1740 1741 /// Calculate what the inheritance model would be for this class. 1742 MSInheritanceModel calculateInheritanceModel() const; 1743 1744 /// In the Microsoft C++ ABI, use zero for the field offset of a null data 1745 /// member pointer if we can guarantee that zero is not a valid field offset, 1746 /// or if the member pointer has multiple fields. Polymorphic classes have a 1747 /// vfptr at offset zero, so we can use zero for null. If there are multiple 1748 /// fields, we can use zero even if it is a valid field offset because 1749 /// null-ness testing will check the other fields. 1750 bool nullFieldOffsetIsZero() const; 1751 1752 /// Controls when vtordisps will be emitted if this record is used as a 1753 /// virtual base. 1754 MSVtorDispMode getMSVtorDispMode() const; 1755 1756 /// Determine whether this lambda expression was known to be dependent 1757 /// at the time it was created, even if its context does not appear to be 1758 /// dependent. 1759 /// 1760 /// This flag is a workaround for an issue with parsing, where default 1761 /// arguments are parsed before their enclosing function declarations have 1762 /// been created. This means that any lambda expressions within those 1763 /// default arguments will have as their DeclContext the context enclosing 1764 /// the function declaration, which may be non-dependent even when the 1765 /// function declaration itself is dependent. This flag indicates when we 1766 /// know that the lambda is dependent despite that. 1767 bool isDependentLambda() const { 1768 return isLambda() && getLambdaData().Dependent; 1769 } 1770 1771 TypeSourceInfo *getLambdaTypeInfo() const { 1772 return getLambdaData().MethodTyInfo; 1773 } 1774 1775 // Determine whether this type is an Interface Like type for 1776 // __interface inheritance purposes. 1777 bool isInterfaceLike() const; 1778 1779 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 1780 static bool classofKind(Kind K) { 1781 return K >= firstCXXRecord && K <= lastCXXRecord; 1782 } 1783}; 1784 1785/// Store information needed for an explicit specifier. 1786/// Used by CXXDeductionGuideDecl, CXXConstructorDecl and CXXConversionDecl. 1787class ExplicitSpecifier { 1788 llvm::PointerIntPair<Expr *, 2, ExplicitSpecKind> ExplicitSpec{ 1789 nullptr, ExplicitSpecKind::ResolvedFalse}; 1790 1791public: 1792 ExplicitSpecifier() = default; 1793 ExplicitSpecifier(Expr *Expression, ExplicitSpecKind Kind) 1794 : ExplicitSpec(Expression, Kind) {} 1795 ExplicitSpecKind getKind() const { return ExplicitSpec.getInt(); } 1796 const Expr *getExpr() const { return ExplicitSpec.getPointer(); } 1797 Expr *getExpr() { return ExplicitSpec.getPointer(); } 1798 1799 /// Determine if the declaration had an explicit specifier of any kind. 1800 bool isSpecified() const { 1801 return ExplicitSpec.getInt() != ExplicitSpecKind::ResolvedFalse || 1802 ExplicitSpec.getPointer(); 1803 } 1804 1805 /// Check for equivalence of explicit specifiers. 1806 /// \return true if the explicit specifier are equivalent, false otherwise. 1807 bool isEquivalent(const ExplicitSpecifier Other) const; 1808 /// Determine whether this specifier is known to correspond to an explicit 1809 /// declaration. Returns false if the specifier is absent or has an 1810 /// expression that is value-dependent or evaluates to false. 1811 bool isExplicit() const { 1812 return ExplicitSpec.getInt() == ExplicitSpecKind::ResolvedTrue; 1813 } 1814 /// Determine if the explicit specifier is invalid. 1815 /// This state occurs after a substitution failures. 1816 bool isInvalid() const { 1817 return ExplicitSpec.getInt() == ExplicitSpecKind::Unresolved && 1818 !ExplicitSpec.getPointer(); 1819 } 1820 void setKind(ExplicitSpecKind Kind) { ExplicitSpec.setInt(Kind); } 1821 void setExpr(Expr *E) { ExplicitSpec.setPointer(E); } 1822 // Retrieve the explicit specifier in the given declaration, if any. 1823 static ExplicitSpecifier getFromDecl(FunctionDecl *Function); 1824 static const ExplicitSpecifier getFromDecl(const FunctionDecl *Function) { 1825 return getFromDecl(const_cast<FunctionDecl *>(Function)); 1826 } 1827 static ExplicitSpecifier Invalid() { 1828 return ExplicitSpecifier(nullptr, ExplicitSpecKind::Unresolved); 1829 } 1830}; 1831 1832/// Represents a C++ deduction guide declaration. 1833/// 1834/// \code 1835/// template<typename T> struct A { A(); A(T); }; 1836/// A() -> A<int>; 1837/// \endcode 1838/// 1839/// In this example, there will be an explicit deduction guide from the 1840/// second line, and implicit deduction guide templates synthesized from 1841/// the constructors of \c A. 1842class CXXDeductionGuideDecl : public FunctionDecl { 1843 void anchor() override; 1844 1845private: 1846 CXXDeductionGuideDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, 1847 ExplicitSpecifier ES, 1848 const DeclarationNameInfo &NameInfo, QualType T, 1849 TypeSourceInfo *TInfo, SourceLocation EndLocation) 1850 : FunctionDecl(CXXDeductionGuide, C, DC, StartLoc, NameInfo, T, TInfo, 1851 SC_None, false, CSK_unspecified), 1852 ExplicitSpec(ES) { 1853 if (EndLocation.isValid()) 1854 setRangeEnd(EndLocation); 1855 setIsCopyDeductionCandidate(false); 1856 } 1857 1858 ExplicitSpecifier ExplicitSpec; 1859 void setExplicitSpecifier(ExplicitSpecifier ES) { ExplicitSpec = ES; } 1860 1861public: 1862 friend class ASTDeclReader; 1863 friend class ASTDeclWriter; 1864 1865 static CXXDeductionGuideDecl * 1866 Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, 1867 ExplicitSpecifier ES, const DeclarationNameInfo &NameInfo, QualType T, 1868 TypeSourceInfo *TInfo, SourceLocation EndLocation); 1869 1870 static CXXDeductionGuideDecl *CreateDeserialized(ASTContext &C, unsigned ID); 1871 1872 ExplicitSpecifier getExplicitSpecifier() { return ExplicitSpec; } 1873 const ExplicitSpecifier getExplicitSpecifier() const { return ExplicitSpec; } 1874 1875 /// Return true if the declartion is already resolved to be explicit. 1876 bool isExplicit() const { return ExplicitSpec.isExplicit(); } 1877 1878 /// Get the template for which this guide performs deduction. 1879 TemplateDecl *getDeducedTemplate() const { 1880 return getDeclName().getCXXDeductionGuideTemplate(); 1881 } 1882 1883 void setIsCopyDeductionCandidate(bool isCDC = true) { 1884 FunctionDeclBits.IsCopyDeductionCandidate = isCDC; 1885 } 1886 1887 bool isCopyDeductionCandidate() const { 1888 return FunctionDeclBits.IsCopyDeductionCandidate; 1889 } 1890 1891 // Implement isa/cast/dyncast/etc. 1892 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 1893 static bool classofKind(Kind K) { return K == CXXDeductionGuide; } 1894}; 1895 1896/// \brief Represents the body of a requires-expression. 1897/// 1898/// This decl exists merely to serve as the DeclContext for the local 1899/// parameters of the requires expression as well as other declarations inside 1900/// it. 1901/// 1902/// \code 1903/// template<typename T> requires requires (T t) { {t++} -> regular; } 1904/// \endcode 1905/// 1906/// In this example, a RequiresExpr object will be generated for the expression, 1907/// and a RequiresExprBodyDecl will be created to hold the parameter t and the 1908/// template argument list imposed by the compound requirement. 1909class RequiresExprBodyDecl : public Decl, public DeclContext { 1910 RequiresExprBodyDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc) 1911 : Decl(RequiresExprBody, DC, StartLoc), DeclContext(RequiresExprBody) {} 1912 1913public: 1914 friend class ASTDeclReader; 1915 friend class ASTDeclWriter; 1916 1917 static RequiresExprBodyDecl *Create(ASTContext &C, DeclContext *DC, 1918 SourceLocation StartLoc); 1919 1920 static RequiresExprBodyDecl *CreateDeserialized(ASTContext &C, unsigned ID); 1921 1922 // Implement isa/cast/dyncast/etc. 1923 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 1924 static bool classofKind(Kind K) { return K == RequiresExprBody; } 1925}; 1926 1927/// Represents a static or instance method of a struct/union/class. 1928/// 1929/// In the terminology of the C++ Standard, these are the (static and 1930/// non-static) member functions, whether virtual or not. 1931class CXXMethodDecl : public FunctionDecl { 1932 void anchor() override; 1933 1934protected: 1935 CXXMethodDecl(Kind DK, ASTContext &C, CXXRecordDecl *RD, 1936 SourceLocation StartLoc, const DeclarationNameInfo &NameInfo, 1937 QualType T, TypeSourceInfo *TInfo, StorageClass SC, 1938 bool isInline, ConstexprSpecKind ConstexprKind, 1939 SourceLocation EndLocation, 1940 Expr *TrailingRequiresClause = nullptr) 1941 : FunctionDecl(DK, C, RD, StartLoc, NameInfo, T, TInfo, SC, isInline, 1942 ConstexprKind, TrailingRequiresClause) { 1943 if (EndLocation.isValid()) 1944 setRangeEnd(EndLocation); 1945 } 1946 1947public: 1948 static CXXMethodDecl *Create(ASTContext &C, CXXRecordDecl *RD, 1949 SourceLocation StartLoc, 1950 const DeclarationNameInfo &NameInfo, QualType T, 1951 TypeSourceInfo *TInfo, StorageClass SC, 1952 bool isInline, ConstexprSpecKind ConstexprKind, 1953 SourceLocation EndLocation, 1954 Expr *TrailingRequiresClause = nullptr); 1955 1956 static CXXMethodDecl *CreateDeserialized(ASTContext &C, unsigned ID); 1957 1958 bool isStatic() const; 1959 bool isInstance() const { return !isStatic(); } 1960 1961 /// Returns true if the given operator is implicitly static in a record 1962 /// context. 1963 static bool isStaticOverloadedOperator(OverloadedOperatorKind OOK) { 1964 // [class.free]p1: 1965 // Any allocation function for a class T is a static member 1966 // (even if not explicitly declared static). 1967 // [class.free]p6 Any deallocation function for a class X is a static member 1968 // (even if not explicitly declared static). 1969 return OOK == OO_New || OOK == OO_Array_New || OOK == OO_Delete || 1970 OOK == OO_Array_Delete; 1971 } 1972 1973 bool isConst() const { return getType()->castAs<FunctionType>()->isConst(); } 1974 bool isVolatile() const { return getType()->castAs<FunctionType>()->isVolatile(); } 1975 1976 bool isVirtual() const { 1977 CXXMethodDecl *CD = const_cast<CXXMethodDecl*>(this)->getCanonicalDecl(); 1978 1979 // Member function is virtual if it is marked explicitly so, or if it is 1980 // declared in __interface -- then it is automatically pure virtual. 1981 if (CD->isVirtualAsWritten() || CD->isPure()) 1982 return true; 1983 1984 return CD->size_overridden_methods() != 0; 1985 } 1986 1987 /// If it's possible to devirtualize a call to this method, return the called 1988 /// function. Otherwise, return null. 1989 1990 /// \param Base The object on which this virtual function is called. 1991 /// \param IsAppleKext True if we are compiling for Apple kext. 1992 CXXMethodDecl *getDevirtualizedMethod(const Expr *Base, bool IsAppleKext); 1993 1994 const CXXMethodDecl *getDevirtualizedMethod(const Expr *Base, 1995 bool IsAppleKext) const { 1996 return const_cast<CXXMethodDecl *>(this)->getDevirtualizedMethod( 1997 Base, IsAppleKext); 1998 } 1999 2000 /// Determine whether this is a usual deallocation function (C++ 2001 /// [basic.stc.dynamic.deallocation]p2), which is an overloaded delete or 2002 /// delete[] operator with a particular signature. Populates \p PreventedBy 2003 /// with the declarations of the functions of the same kind if they were the 2004 /// reason for this function returning false. This is used by 2005 /// Sema::isUsualDeallocationFunction to reconsider the answer based on the 2006 /// context. 2007 bool isUsualDeallocationFunction( 2008 SmallVectorImpl<const FunctionDecl *> &PreventedBy) const; 2009 2010 /// Determine whether this is a copy-assignment operator, regardless 2011 /// of whether it was declared implicitly or explicitly. 2012 bool isCopyAssignmentOperator() const; 2013 2014 /// Determine whether this is a move assignment operator. 2015 bool isMoveAssignmentOperator() const; 2016 2017 CXXMethodDecl *getCanonicalDecl() override { 2018 return cast<CXXMethodDecl>(FunctionDecl::getCanonicalDecl()); 2019 } 2020 const CXXMethodDecl *getCanonicalDecl() const { 2021 return const_cast<CXXMethodDecl*>(this)->getCanonicalDecl(); 2022 } 2023 2024 CXXMethodDecl *getMostRecentDecl() { 2025 return cast<CXXMethodDecl>( 2026 static_cast<FunctionDecl *>(this)->getMostRecentDecl()); 2027 } 2028 const CXXMethodDecl *getMostRecentDecl() const { 2029 return const_cast<CXXMethodDecl*>(this)->getMostRecentDecl(); 2030 } 2031 2032 void addOverriddenMethod(const CXXMethodDecl *MD); 2033 2034 using method_iterator = const CXXMethodDecl *const *; 2035 2036 method_iterator begin_overridden_methods() const; 2037 method_iterator end_overridden_methods() const; 2038 unsigned size_overridden_methods() const; 2039 2040 using overridden_method_range= ASTContext::overridden_method_range; 2041 2042 overridden_method_range overridden_methods() const; 2043 2044 /// Return the parent of this method declaration, which 2045 /// is the class in which this method is defined. 2046 const CXXRecordDecl *getParent() const { 2047 return cast<CXXRecordDecl>(FunctionDecl::getParent()); 2048 } 2049 2050 /// Return the parent of this method declaration, which 2051 /// is the class in which this method is defined. 2052 CXXRecordDecl *getParent() { 2053 return const_cast<CXXRecordDecl *>( 2054 cast<CXXRecordDecl>(FunctionDecl::getParent())); 2055 } 2056 2057 /// Return the type of the \c this pointer. 2058 /// 2059 /// Should only be called for instance (i.e., non-static) methods. Note 2060 /// that for the call operator of a lambda closure type, this returns the 2061 /// desugared 'this' type (a pointer to the closure type), not the captured 2062 /// 'this' type. 2063 QualType getThisType() const; 2064 2065 /// Return the type of the object pointed by \c this. 2066 /// 2067 /// See getThisType() for usage restriction. 2068 QualType getThisObjectType() const; 2069 2070 static QualType getThisType(const FunctionProtoType *FPT, 2071 const CXXRecordDecl *Decl); 2072 2073 static QualType getThisObjectType(const FunctionProtoType *FPT, 2074 const CXXRecordDecl *Decl); 2075 2076 Qualifiers getMethodQualifiers() const { 2077 return getType()->castAs<FunctionProtoType>()->getMethodQuals(); 2078 } 2079 2080 /// Retrieve the ref-qualifier associated with this method. 2081 /// 2082 /// In the following example, \c f() has an lvalue ref-qualifier, \c g() 2083 /// has an rvalue ref-qualifier, and \c h() has no ref-qualifier. 2084 /// @code 2085 /// struct X { 2086 /// void f() &; 2087 /// void g() &&; 2088 /// void h(); 2089 /// }; 2090 /// @endcode 2091 RefQualifierKind getRefQualifier() const { 2092 return getType()->castAs<FunctionProtoType>()->getRefQualifier(); 2093 } 2094 2095 bool hasInlineBody() const; 2096 2097 /// Determine whether this is a lambda closure type's static member 2098 /// function that is used for the result of the lambda's conversion to 2099 /// function pointer (for a lambda with no captures). 2100 /// 2101 /// The function itself, if used, will have a placeholder body that will be 2102 /// supplied by IR generation to either forward to the function call operator 2103 /// or clone the function call operator. 2104 bool isLambdaStaticInvoker() const; 2105 2106 /// Find the method in \p RD that corresponds to this one. 2107 /// 2108 /// Find if \p RD or one of the classes it inherits from override this method. 2109 /// If so, return it. \p RD is assumed to be a subclass of the class defining 2110 /// this method (or be the class itself), unless \p MayBeBase is set to true. 2111 CXXMethodDecl * 2112 getCorrespondingMethodInClass(const CXXRecordDecl *RD, 2113 bool MayBeBase = false); 2114 2115 const CXXMethodDecl * 2116 getCorrespondingMethodInClass(const CXXRecordDecl *RD, 2117 bool MayBeBase = false) const { 2118 return const_cast<CXXMethodDecl *>(this) 2119 ->getCorrespondingMethodInClass(RD, MayBeBase); 2120 } 2121 2122 /// Find if \p RD declares a function that overrides this function, and if so, 2123 /// return it. Does not search base classes. 2124 CXXMethodDecl *getCorrespondingMethodDeclaredInClass(const CXXRecordDecl *RD, 2125 bool MayBeBase = false); 2126 const CXXMethodDecl * 2127 getCorrespondingMethodDeclaredInClass(const CXXRecordDecl *RD, 2128 bool MayBeBase = false) const { 2129 return const_cast<CXXMethodDecl *>(this) 2130 ->getCorrespondingMethodDeclaredInClass(RD, MayBeBase); 2131 } 2132 2133 // Implement isa/cast/dyncast/etc. 2134 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2135 static bool classofKind(Kind K) { 2136 return K >= firstCXXMethod && K <= lastCXXMethod; 2137 } 2138}; 2139 2140/// Represents a C++ base or member initializer. 2141/// 2142/// This is part of a constructor initializer that 2143/// initializes one non-static member variable or one base class. For 2144/// example, in the following, both 'A(a)' and 'f(3.14159)' are member 2145/// initializers: 2146/// 2147/// \code 2148/// class A { }; 2149/// class B : public A { 2150/// float f; 2151/// public: 2152/// B(A& a) : A(a), f(3.14159) { } 2153/// }; 2154/// \endcode 2155class CXXCtorInitializer final { 2156 /// Either the base class name/delegating constructor type (stored as 2157 /// a TypeSourceInfo*), an normal field (FieldDecl), or an anonymous field 2158 /// (IndirectFieldDecl*) being initialized. 2159 llvm::PointerUnion<TypeSourceInfo *, FieldDecl *, IndirectFieldDecl *> 2160 Initializee; 2161 2162 /// The source location for the field name or, for a base initializer 2163 /// pack expansion, the location of the ellipsis. 2164 /// 2165 /// In the case of a delegating 2166 /// constructor, it will still include the type's source location as the 2167 /// Initializee points to the CXXConstructorDecl (to allow loop detection). 2168 SourceLocation MemberOrEllipsisLocation; 2169 2170 /// The argument used to initialize the base or member, which may 2171 /// end up constructing an object (when multiple arguments are involved). 2172 Stmt *Init; 2173 2174 /// Location of the left paren of the ctor-initializer. 2175 SourceLocation LParenLoc; 2176 2177 /// Location of the right paren of the ctor-initializer. 2178 SourceLocation RParenLoc; 2179 2180 /// If the initializee is a type, whether that type makes this 2181 /// a delegating initialization. 2182 unsigned IsDelegating : 1; 2183 2184 /// If the initializer is a base initializer, this keeps track 2185 /// of whether the base is virtual or not. 2186 unsigned IsVirtual : 1; 2187 2188 /// Whether or not the initializer is explicitly written 2189 /// in the sources. 2190 unsigned IsWritten : 1; 2191 2192 /// If IsWritten is true, then this number keeps track of the textual order 2193 /// of this initializer in the original sources, counting from 0. 2194 unsigned SourceOrder : 13; 2195 2196public: 2197 /// Creates a new base-class initializer. 2198 explicit 2199 CXXCtorInitializer(ASTContext &Context, TypeSourceInfo *TInfo, bool IsVirtual, 2200 SourceLocation L, Expr *Init, SourceLocation R, 2201 SourceLocation EllipsisLoc); 2202 2203 /// Creates a new member initializer. 2204 explicit 2205 CXXCtorInitializer(ASTContext &Context, FieldDecl *Member, 2206 SourceLocation MemberLoc, SourceLocation L, Expr *Init, 2207 SourceLocation R); 2208 2209 /// Creates a new anonymous field initializer. 2210 explicit 2211 CXXCtorInitializer(ASTContext &Context, IndirectFieldDecl *Member, 2212 SourceLocation MemberLoc, SourceLocation L, Expr *Init, 2213 SourceLocation R); 2214 2215 /// Creates a new delegating initializer. 2216 explicit 2217 CXXCtorInitializer(ASTContext &Context, TypeSourceInfo *TInfo, 2218 SourceLocation L, Expr *Init, SourceLocation R); 2219 2220 /// \return Unique reproducible object identifier. 2221 int64_t getID(const ASTContext &Context) const; 2222 2223 /// Determine whether this initializer is initializing a base class. 2224 bool isBaseInitializer() const { 2225 return Initializee.is<TypeSourceInfo*>() && !IsDelegating; 2226 } 2227 2228 /// Determine whether this initializer is initializing a non-static 2229 /// data member. 2230 bool isMemberInitializer() const { return Initializee.is<FieldDecl*>(); } 2231 2232 bool isAnyMemberInitializer() const { 2233 return isMemberInitializer() || isIndirectMemberInitializer(); 2234 } 2235 2236 bool isIndirectMemberInitializer() const { 2237 return Initializee.is<IndirectFieldDecl*>(); 2238 } 2239 2240 /// Determine whether this initializer is an implicit initializer 2241 /// generated for a field with an initializer defined on the member 2242 /// declaration. 2243 /// 2244 /// In-class member initializers (also known as "non-static data member 2245 /// initializations", NSDMIs) were introduced in C++11. 2246 bool isInClassMemberInitializer() const { 2247 return Init->getStmtClass() == Stmt::CXXDefaultInitExprClass; 2248 } 2249 2250 /// Determine whether this initializer is creating a delegating 2251 /// constructor. 2252 bool isDelegatingInitializer() const { 2253 return Initializee.is<TypeSourceInfo*>() && IsDelegating; 2254 } 2255 2256 /// Determine whether this initializer is a pack expansion. 2257 bool isPackExpansion() const { 2258 return isBaseInitializer() && MemberOrEllipsisLocation.isValid(); 2259 } 2260 2261 // For a pack expansion, returns the location of the ellipsis. 2262 SourceLocation getEllipsisLoc() const { 2263 assert(isPackExpansion() && "Initializer is not a pack expansion"); 2264 return MemberOrEllipsisLocation; 2265 } 2266 2267 /// If this is a base class initializer, returns the type of the 2268 /// base class with location information. Otherwise, returns an NULL 2269 /// type location. 2270 TypeLoc getBaseClassLoc() const; 2271 2272 /// If this is a base class initializer, returns the type of the base class. 2273 /// Otherwise, returns null. 2274 const Type *getBaseClass() const; 2275 2276 /// Returns whether the base is virtual or not. 2277 bool isBaseVirtual() const { 2278 assert(isBaseInitializer() && "Must call this on base initializer!"); 2279 2280 return IsVirtual; 2281 } 2282 2283 /// Returns the declarator information for a base class or delegating 2284 /// initializer. 2285 TypeSourceInfo *getTypeSourceInfo() const { 2286 return Initializee.dyn_cast<TypeSourceInfo *>(); 2287 } 2288 2289 /// If this is a member initializer, returns the declaration of the 2290 /// non-static data member being initialized. Otherwise, returns null. 2291 FieldDecl *getMember() const { 2292 if (isMemberInitializer()) 2293 return Initializee.get<FieldDecl*>(); 2294 return nullptr; 2295 } 2296 2297 FieldDecl *getAnyMember() const { 2298 if (isMemberInitializer()) 2299 return Initializee.get<FieldDecl*>(); 2300 if (isIndirectMemberInitializer()) 2301 return Initializee.get<IndirectFieldDecl*>()->getAnonField(); 2302 return nullptr; 2303 } 2304 2305 IndirectFieldDecl *getIndirectMember() const { 2306 if (isIndirectMemberInitializer()) 2307 return Initializee.get<IndirectFieldDecl*>(); 2308 return nullptr; 2309 } 2310 2311 SourceLocation getMemberLocation() const { 2312 return MemberOrEllipsisLocation; 2313 } 2314 2315 /// Determine the source location of the initializer. 2316 SourceLocation getSourceLocation() const; 2317 2318 /// Determine the source range covering the entire initializer. 2319 SourceRange getSourceRange() const LLVM_READONLY; 2320 2321 /// Determine whether this initializer is explicitly written 2322 /// in the source code. 2323 bool isWritten() const { return IsWritten; } 2324 2325 /// Return the source position of the initializer, counting from 0. 2326 /// If the initializer was implicit, -1 is returned. 2327 int getSourceOrder() const { 2328 return IsWritten ? static_cast<int>(SourceOrder) : -1; 2329 } 2330 2331 /// Set the source order of this initializer. 2332 /// 2333 /// This can only be called once for each initializer; it cannot be called 2334 /// on an initializer having a positive number of (implicit) array indices. 2335 /// 2336 /// This assumes that the initializer was written in the source code, and 2337 /// ensures that isWritten() returns true. 2338 void setSourceOrder(int Pos) { 2339 assert(!IsWritten && 2340 "setSourceOrder() used on implicit initializer"); 2341 assert(SourceOrder == 0 && 2342 "calling twice setSourceOrder() on the same initializer"); 2343 assert(Pos >= 0 && 2344 "setSourceOrder() used to make an initializer implicit"); 2345 IsWritten = true; 2346 SourceOrder = static_cast<unsigned>(Pos); 2347 } 2348 2349 SourceLocation getLParenLoc() const { return LParenLoc; } 2350 SourceLocation getRParenLoc() const { return RParenLoc; } 2351 2352 /// Get the initializer. 2353 Expr *getInit() const { return static_cast<Expr *>(Init); } 2354}; 2355 2356/// Description of a constructor that was inherited from a base class. 2357class InheritedConstructor { 2358 ConstructorUsingShadowDecl *Shadow = nullptr; 2359 CXXConstructorDecl *BaseCtor = nullptr; 2360 2361public: 2362 InheritedConstructor() = default; 2363 InheritedConstructor(ConstructorUsingShadowDecl *Shadow, 2364 CXXConstructorDecl *BaseCtor) 2365 : Shadow(Shadow), BaseCtor(BaseCtor) {} 2366 2367 explicit operator bool() const { return Shadow; } 2368 2369 ConstructorUsingShadowDecl *getShadowDecl() const { return Shadow; } 2370 CXXConstructorDecl *getConstructor() const { return BaseCtor; } 2371}; 2372 2373/// Represents a C++ constructor within a class. 2374/// 2375/// For example: 2376/// 2377/// \code 2378/// class X { 2379/// public: 2380/// explicit X(int); // represented by a CXXConstructorDecl. 2381/// }; 2382/// \endcode 2383class CXXConstructorDecl final 2384 : public CXXMethodDecl, 2385 private llvm::TrailingObjects<CXXConstructorDecl, InheritedConstructor, 2386 ExplicitSpecifier> { 2387 // This class stores some data in DeclContext::CXXConstructorDeclBits 2388 // to save some space. Use the provided accessors to access it. 2389 2390 /// \name Support for base and member initializers. 2391 /// \{ 2392 /// The arguments used to initialize the base or member. 2393 LazyCXXCtorInitializersPtr CtorInitializers; 2394 2395 CXXConstructorDecl(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2396 const DeclarationNameInfo &NameInfo, QualType T, 2397 TypeSourceInfo *TInfo, ExplicitSpecifier ES, bool isInline, 2398 bool isImplicitlyDeclared, ConstexprSpecKind ConstexprKind, 2399 InheritedConstructor Inherited, 2400 Expr *TrailingRequiresClause); 2401 2402 void anchor() override; 2403 2404 size_t numTrailingObjects(OverloadToken<InheritedConstructor>) const { 2405 return CXXConstructorDeclBits.IsInheritingConstructor; 2406 } 2407 size_t numTrailingObjects(OverloadToken<ExplicitSpecifier>) const { 2408 return CXXConstructorDeclBits.HasTrailingExplicitSpecifier; 2409 } 2410 2411 ExplicitSpecifier getExplicitSpecifierInternal() const { 2412 if (CXXConstructorDeclBits.HasTrailingExplicitSpecifier) 2413 return *getTrailingObjects<ExplicitSpecifier>(); 2414 return ExplicitSpecifier( 2415 nullptr, CXXConstructorDeclBits.IsSimpleExplicit 2416 ? ExplicitSpecKind::ResolvedTrue 2417 : ExplicitSpecKind::ResolvedFalse); 2418 } 2419 2420 void setExplicitSpecifier(ExplicitSpecifier ES) { 2421 assert((!ES.getExpr() || 2422 CXXConstructorDeclBits.HasTrailingExplicitSpecifier) && 2423 "cannot set this explicit specifier. no trail-allocated space for " 2424 "explicit"); 2425 if (ES.getExpr()) 2426 *getCanonicalDecl()->getTrailingObjects<ExplicitSpecifier>() = ES; 2427 else 2428 CXXConstructorDeclBits.IsSimpleExplicit = ES.isExplicit(); 2429 } 2430 2431 enum TraillingAllocKind { 2432 TAKInheritsConstructor = 1, 2433 TAKHasTailExplicit = 1 << 1, 2434 }; 2435 2436 uint64_t getTraillingAllocKind() const { 2437 return numTrailingObjects(OverloadToken<InheritedConstructor>()) | 2438 (numTrailingObjects(OverloadToken<ExplicitSpecifier>()) << 1); 2439 } 2440 2441public: 2442 friend class ASTDeclReader; 2443 friend class ASTDeclWriter; 2444 friend TrailingObjects; 2445 2446 static CXXConstructorDecl *CreateDeserialized(ASTContext &C, unsigned ID, 2447 uint64_t AllocKind); 2448 static CXXConstructorDecl * 2449 Create(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2450 const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo, 2451 ExplicitSpecifier ES, bool isInline, bool isImplicitlyDeclared, 2452 ConstexprSpecKind ConstexprKind, 2453 InheritedConstructor Inherited = InheritedConstructor(), 2454 Expr *TrailingRequiresClause = nullptr); 2455 2456 ExplicitSpecifier getExplicitSpecifier() { 2457 return getCanonicalDecl()->getExplicitSpecifierInternal(); 2458 } 2459 const ExplicitSpecifier getExplicitSpecifier() const { 2460 return getCanonicalDecl()->getExplicitSpecifierInternal(); 2461 } 2462 2463 /// Return true if the declartion is already resolved to be explicit. 2464 bool isExplicit() const { return getExplicitSpecifier().isExplicit(); } 2465 2466 /// Iterates through the member/base initializer list. 2467 using init_iterator = CXXCtorInitializer **; 2468 2469 /// Iterates through the member/base initializer list. 2470 using init_const_iterator = CXXCtorInitializer *const *; 2471 2472 using init_range = llvm::iterator_range<init_iterator>; 2473 using init_const_range = llvm::iterator_range<init_const_iterator>; 2474 2475 init_range inits() { return init_range(init_begin(), init_end()); } 2476 init_const_range inits() const { 2477 return init_const_range(init_begin(), init_end()); 2478 } 2479 2480 /// Retrieve an iterator to the first initializer. 2481 init_iterator init_begin() { 2482 const auto *ConstThis = this; 2483 return const_cast<init_iterator>(ConstThis->init_begin()); 2484 } 2485 2486 /// Retrieve an iterator to the first initializer. 2487 init_const_iterator init_begin() const; 2488 2489 /// Retrieve an iterator past the last initializer. 2490 init_iterator init_end() { 2491 return init_begin() + getNumCtorInitializers(); 2492 } 2493 2494 /// Retrieve an iterator past the last initializer. 2495 init_const_iterator init_end() const { 2496 return init_begin() + getNumCtorInitializers(); 2497 } 2498 2499 using init_reverse_iterator = std::reverse_iterator<init_iterator>; 2500 using init_const_reverse_iterator = 2501 std::reverse_iterator<init_const_iterator>; 2502 2503 init_reverse_iterator init_rbegin() { 2504 return init_reverse_iterator(init_end()); 2505 } 2506 init_const_reverse_iterator init_rbegin() const { 2507 return init_const_reverse_iterator(init_end()); 2508 } 2509 2510 init_reverse_iterator init_rend() { 2511 return init_reverse_iterator(init_begin()); 2512 } 2513 init_const_reverse_iterator init_rend() const { 2514 return init_const_reverse_iterator(init_begin()); 2515 } 2516 2517 /// Determine the number of arguments used to initialize the member 2518 /// or base. 2519 unsigned getNumCtorInitializers() const { 2520 return CXXConstructorDeclBits.NumCtorInitializers; 2521 } 2522 2523 void setNumCtorInitializers(unsigned numCtorInitializers) { 2524 CXXConstructorDeclBits.NumCtorInitializers = numCtorInitializers; 2525 // This assert added because NumCtorInitializers is stored 2526 // in CXXConstructorDeclBits as a bitfield and its width has 2527 // been shrunk from 32 bits to fit into CXXConstructorDeclBitfields. 2528 assert(CXXConstructorDeclBits.NumCtorInitializers == 2529 numCtorInitializers && "NumCtorInitializers overflow!"); 2530 } 2531 2532 void setCtorInitializers(CXXCtorInitializer **Initializers) { 2533 CtorInitializers = Initializers; 2534 } 2535 2536 /// Determine whether this constructor is a delegating constructor. 2537 bool isDelegatingConstructor() const { 2538 return (getNumCtorInitializers() == 1) && 2539 init_begin()[0]->isDelegatingInitializer(); 2540 } 2541 2542 /// When this constructor delegates to another, retrieve the target. 2543 CXXConstructorDecl *getTargetConstructor() const; 2544 2545 /// Whether this constructor is a default 2546 /// constructor (C++ [class.ctor]p5), which can be used to 2547 /// default-initialize a class of this type. 2548 bool isDefaultConstructor() const; 2549 2550 /// Whether this constructor is a copy constructor (C++ [class.copy]p2, 2551 /// which can be used to copy the class. 2552 /// 2553 /// \p TypeQuals will be set to the qualifiers on the 2554 /// argument type. For example, \p TypeQuals would be set to \c 2555 /// Qualifiers::Const for the following copy constructor: 2556 /// 2557 /// \code 2558 /// class X { 2559 /// public: 2560 /// X(const X&); 2561 /// }; 2562 /// \endcode 2563 bool isCopyConstructor(unsigned &TypeQuals) const; 2564 2565 /// Whether this constructor is a copy 2566 /// constructor (C++ [class.copy]p2, which can be used to copy the 2567 /// class. 2568 bool isCopyConstructor() const { 2569 unsigned TypeQuals = 0; 2570 return isCopyConstructor(TypeQuals); 2571 } 2572 2573 /// Determine whether this constructor is a move constructor 2574 /// (C++11 [class.copy]p3), which can be used to move values of the class. 2575 /// 2576 /// \param TypeQuals If this constructor is a move constructor, will be set 2577 /// to the type qualifiers on the referent of the first parameter's type. 2578 bool isMoveConstructor(unsigned &TypeQuals) const; 2579 2580 /// Determine whether this constructor is a move constructor 2581 /// (C++11 [class.copy]p3), which can be used to move values of the class. 2582 bool isMoveConstructor() const { 2583 unsigned TypeQuals = 0; 2584 return isMoveConstructor(TypeQuals); 2585 } 2586 2587 /// Determine whether this is a copy or move constructor. 2588 /// 2589 /// \param TypeQuals Will be set to the type qualifiers on the reference 2590 /// parameter, if in fact this is a copy or move constructor. 2591 bool isCopyOrMoveConstructor(unsigned &TypeQuals) const; 2592 2593 /// Determine whether this a copy or move constructor. 2594 bool isCopyOrMoveConstructor() const { 2595 unsigned Quals; 2596 return isCopyOrMoveConstructor(Quals); 2597 } 2598 2599 /// Whether this constructor is a 2600 /// converting constructor (C++ [class.conv.ctor]), which can be 2601 /// used for user-defined conversions. 2602 bool isConvertingConstructor(bool AllowExplicit) const; 2603 2604 /// Determine whether this is a member template specialization that 2605 /// would copy the object to itself. Such constructors are never used to copy 2606 /// an object. 2607 bool isSpecializationCopyingObject() const; 2608 2609 /// Determine whether this is an implicit constructor synthesized to 2610 /// model a call to a constructor inherited from a base class. 2611 bool isInheritingConstructor() const { 2612 return CXXConstructorDeclBits.IsInheritingConstructor; 2613 } 2614 2615 /// State that this is an implicit constructor synthesized to 2616 /// model a call to a constructor inherited from a base class. 2617 void setInheritingConstructor(bool isIC = true) { 2618 CXXConstructorDeclBits.IsInheritingConstructor = isIC; 2619 } 2620 2621 /// Get the constructor that this inheriting constructor is based on. 2622 InheritedConstructor getInheritedConstructor() const { 2623 return isInheritingConstructor() ? 2624 *getTrailingObjects<InheritedConstructor>() : InheritedConstructor(); 2625 } 2626 2627 CXXConstructorDecl *getCanonicalDecl() override { 2628 return cast<CXXConstructorDecl>(FunctionDecl::getCanonicalDecl()); 2629 } 2630 const CXXConstructorDecl *getCanonicalDecl() const { 2631 return const_cast<CXXConstructorDecl*>(this)->getCanonicalDecl(); 2632 } 2633 2634 // Implement isa/cast/dyncast/etc. 2635 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2636 static bool classofKind(Kind K) { return K == CXXConstructor; } 2637}; 2638 2639/// Represents a C++ destructor within a class. 2640/// 2641/// For example: 2642/// 2643/// \code 2644/// class X { 2645/// public: 2646/// ~X(); // represented by a CXXDestructorDecl. 2647/// }; 2648/// \endcode 2649class CXXDestructorDecl : public CXXMethodDecl { 2650 friend class ASTDeclReader; 2651 friend class ASTDeclWriter; 2652 2653 // FIXME: Don't allocate storage for these except in the first declaration 2654 // of a virtual destructor. 2655 FunctionDecl *OperatorDelete = nullptr; 2656 Expr *OperatorDeleteThisArg = nullptr; 2657 2658 CXXDestructorDecl(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2659 const DeclarationNameInfo &NameInfo, QualType T, 2660 TypeSourceInfo *TInfo, bool isInline, 2661 bool isImplicitlyDeclared, ConstexprSpecKind ConstexprKind, 2662 Expr *TrailingRequiresClause = nullptr) 2663 : CXXMethodDecl(CXXDestructor, C, RD, StartLoc, NameInfo, T, TInfo, 2664 SC_None, isInline, ConstexprKind, SourceLocation(), 2665 TrailingRequiresClause) { 2666 setImplicit(isImplicitlyDeclared); 2667 } 2668 2669 void anchor() override; 2670 2671public: 2672 static CXXDestructorDecl *Create(ASTContext &C, CXXRecordDecl *RD, 2673 SourceLocation StartLoc, 2674 const DeclarationNameInfo &NameInfo, 2675 QualType T, TypeSourceInfo *TInfo, 2676 bool isInline, bool isImplicitlyDeclared, 2677 ConstexprSpecKind ConstexprKind, 2678 Expr *TrailingRequiresClause = nullptr); 2679 static CXXDestructorDecl *CreateDeserialized(ASTContext & C, unsigned ID); 2680 2681 void setOperatorDelete(FunctionDecl *OD, Expr *ThisArg); 2682 2683 const FunctionDecl *getOperatorDelete() const { 2684 return getCanonicalDecl()->OperatorDelete; 2685 } 2686 2687 Expr *getOperatorDeleteThisArg() const { 2688 return getCanonicalDecl()->OperatorDeleteThisArg; 2689 } 2690 2691 CXXDestructorDecl *getCanonicalDecl() override { 2692 return cast<CXXDestructorDecl>(FunctionDecl::getCanonicalDecl()); 2693 } 2694 const CXXDestructorDecl *getCanonicalDecl() const { 2695 return const_cast<CXXDestructorDecl*>(this)->getCanonicalDecl(); 2696 } 2697 2698 // Implement isa/cast/dyncast/etc. 2699 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2700 static bool classofKind(Kind K) { return K == CXXDestructor; } 2701}; 2702 2703/// Represents a C++ conversion function within a class. 2704/// 2705/// For example: 2706/// 2707/// \code 2708/// class X { 2709/// public: 2710/// operator bool(); 2711/// }; 2712/// \endcode 2713class CXXConversionDecl : public CXXMethodDecl { 2714 CXXConversionDecl(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2715 const DeclarationNameInfo &NameInfo, QualType T, 2716 TypeSourceInfo *TInfo, bool isInline, ExplicitSpecifier ES, 2717 ConstexprSpecKind ConstexprKind, SourceLocation EndLocation, 2718 Expr *TrailingRequiresClause = nullptr) 2719 : CXXMethodDecl(CXXConversion, C, RD, StartLoc, NameInfo, T, TInfo, 2720 SC_None, isInline, ConstexprKind, EndLocation, 2721 TrailingRequiresClause), 2722 ExplicitSpec(ES) {} 2723 void anchor() override; 2724 2725 ExplicitSpecifier ExplicitSpec; 2726 2727 void setExplicitSpecifier(ExplicitSpecifier ES) { ExplicitSpec = ES; } 2728 2729public: 2730 friend class ASTDeclReader; 2731 friend class ASTDeclWriter; 2732 2733 static CXXConversionDecl * 2734 Create(ASTContext &C, CXXRecordDecl *RD, SourceLocation StartLoc, 2735 const DeclarationNameInfo &NameInfo, QualType T, TypeSourceInfo *TInfo, 2736 bool isInline, ExplicitSpecifier ES, ConstexprSpecKind ConstexprKind, 2737 SourceLocation EndLocation, Expr *TrailingRequiresClause = nullptr); 2738 static CXXConversionDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2739 2740 ExplicitSpecifier getExplicitSpecifier() { 2741 return getCanonicalDecl()->ExplicitSpec; 2742 } 2743 2744 const ExplicitSpecifier getExplicitSpecifier() const { 2745 return getCanonicalDecl()->ExplicitSpec; 2746 } 2747 2748 /// Return true if the declartion is already resolved to be explicit. 2749 bool isExplicit() const { return getExplicitSpecifier().isExplicit(); } 2750 2751 /// Returns the type that this conversion function is converting to. 2752 QualType getConversionType() const { 2753 return getType()->castAs<FunctionType>()->getReturnType(); 2754 } 2755 2756 /// Determine whether this conversion function is a conversion from 2757 /// a lambda closure type to a block pointer. 2758 bool isLambdaToBlockPointerConversion() const; 2759 2760 CXXConversionDecl *getCanonicalDecl() override { 2761 return cast<CXXConversionDecl>(FunctionDecl::getCanonicalDecl()); 2762 } 2763 const CXXConversionDecl *getCanonicalDecl() const { 2764 return const_cast<CXXConversionDecl*>(this)->getCanonicalDecl(); 2765 } 2766 2767 // Implement isa/cast/dyncast/etc. 2768 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2769 static bool classofKind(Kind K) { return K == CXXConversion; } 2770}; 2771 2772/// Represents a linkage specification. 2773/// 2774/// For example: 2775/// \code 2776/// extern "C" void foo(); 2777/// \endcode 2778class LinkageSpecDecl : public Decl, public DeclContext { 2779 virtual void anchor(); 2780 // This class stores some data in DeclContext::LinkageSpecDeclBits to save 2781 // some space. Use the provided accessors to access it. 2782public: 2783 /// Represents the language in a linkage specification. 2784 /// 2785 /// The values are part of the serialization ABI for 2786 /// ASTs and cannot be changed without altering that ABI. 2787 enum LanguageIDs { lang_c = 1, lang_cxx = 2 }; 2788 2789private: 2790 /// The source location for the extern keyword. 2791 SourceLocation ExternLoc; 2792 2793 /// The source location for the right brace (if valid). 2794 SourceLocation RBraceLoc; 2795 2796 LinkageSpecDecl(DeclContext *DC, SourceLocation ExternLoc, 2797 SourceLocation LangLoc, LanguageIDs lang, bool HasBraces); 2798 2799public: 2800 static LinkageSpecDecl *Create(ASTContext &C, DeclContext *DC, 2801 SourceLocation ExternLoc, 2802 SourceLocation LangLoc, LanguageIDs Lang, 2803 bool HasBraces); 2804 static LinkageSpecDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2805 2806 /// Return the language specified by this linkage specification. 2807 LanguageIDs getLanguage() const { 2808 return static_cast<LanguageIDs>(LinkageSpecDeclBits.Language); 2809 } 2810 2811 /// Set the language specified by this linkage specification. 2812 void setLanguage(LanguageIDs L) { LinkageSpecDeclBits.Language = L; } 2813 2814 /// Determines whether this linkage specification had braces in 2815 /// its syntactic form. 2816 bool hasBraces() const { 2817 assert(!RBraceLoc.isValid() || LinkageSpecDeclBits.HasBraces); 2818 return LinkageSpecDeclBits.HasBraces; 2819 } 2820 2821 SourceLocation getExternLoc() const { return ExternLoc; } 2822 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2823 void setExternLoc(SourceLocation L) { ExternLoc = L; } 2824 void setRBraceLoc(SourceLocation L) { 2825 RBraceLoc = L; 2826 LinkageSpecDeclBits.HasBraces = RBraceLoc.isValid(); 2827 } 2828 2829 SourceLocation getEndLoc() const LLVM_READONLY { 2830 if (hasBraces()) 2831 return getRBraceLoc(); 2832 // No braces: get the end location of the (only) declaration in context 2833 // (if present). 2834 return decls_empty() ? getLocation() : decls_begin()->getEndLoc(); 2835 } 2836 2837 SourceRange getSourceRange() const override LLVM_READONLY { 2838 return SourceRange(ExternLoc, getEndLoc()); 2839 } 2840 2841 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2842 static bool classofKind(Kind K) { return K == LinkageSpec; } 2843 2844 static DeclContext *castToDeclContext(const LinkageSpecDecl *D) { 2845 return static_cast<DeclContext *>(const_cast<LinkageSpecDecl*>(D)); 2846 } 2847 2848 static LinkageSpecDecl *castFromDeclContext(const DeclContext *DC) { 2849 return static_cast<LinkageSpecDecl *>(const_cast<DeclContext*>(DC)); 2850 } 2851}; 2852 2853/// Represents C++ using-directive. 2854/// 2855/// For example: 2856/// \code 2857/// using namespace std; 2858/// \endcode 2859/// 2860/// \note UsingDirectiveDecl should be Decl not NamedDecl, but we provide 2861/// artificial names for all using-directives in order to store 2862/// them in DeclContext effectively. 2863class UsingDirectiveDecl : public NamedDecl { 2864 /// The location of the \c using keyword. 2865 SourceLocation UsingLoc; 2866 2867 /// The location of the \c namespace keyword. 2868 SourceLocation NamespaceLoc; 2869 2870 /// The nested-name-specifier that precedes the namespace. 2871 NestedNameSpecifierLoc QualifierLoc; 2872 2873 /// The namespace nominated by this using-directive. 2874 NamedDecl *NominatedNamespace; 2875 2876 /// Enclosing context containing both using-directive and nominated 2877 /// namespace. 2878 DeclContext *CommonAncestor; 2879 2880 UsingDirectiveDecl(DeclContext *DC, SourceLocation UsingLoc, 2881 SourceLocation NamespcLoc, 2882 NestedNameSpecifierLoc QualifierLoc, 2883 SourceLocation IdentLoc, 2884 NamedDecl *Nominated, 2885 DeclContext *CommonAncestor) 2886 : NamedDecl(UsingDirective, DC, IdentLoc, getName()), UsingLoc(UsingLoc), 2887 NamespaceLoc(NamespcLoc), QualifierLoc(QualifierLoc), 2888 NominatedNamespace(Nominated), CommonAncestor(CommonAncestor) {} 2889 2890 /// Returns special DeclarationName used by using-directives. 2891 /// 2892 /// This is only used by DeclContext for storing UsingDirectiveDecls in 2893 /// its lookup structure. 2894 static DeclarationName getName() { 2895 return DeclarationName::getUsingDirectiveName(); 2896 } 2897 2898 void anchor() override; 2899 2900public: 2901 friend class ASTDeclReader; 2902 2903 // Friend for getUsingDirectiveName. 2904 friend class DeclContext; 2905 2906 /// Retrieve the nested-name-specifier that qualifies the 2907 /// name of the namespace, with source-location information. 2908 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 2909 2910 /// Retrieve the nested-name-specifier that qualifies the 2911 /// name of the namespace. 2912 NestedNameSpecifier *getQualifier() const { 2913 return QualifierLoc.getNestedNameSpecifier(); 2914 } 2915 2916 NamedDecl *getNominatedNamespaceAsWritten() { return NominatedNamespace; } 2917 const NamedDecl *getNominatedNamespaceAsWritten() const { 2918 return NominatedNamespace; 2919 } 2920 2921 /// Returns the namespace nominated by this using-directive. 2922 NamespaceDecl *getNominatedNamespace(); 2923 2924 const NamespaceDecl *getNominatedNamespace() const { 2925 return const_cast<UsingDirectiveDecl*>(this)->getNominatedNamespace(); 2926 } 2927 2928 /// Returns the common ancestor context of this using-directive and 2929 /// its nominated namespace. 2930 DeclContext *getCommonAncestor() { return CommonAncestor; } 2931 const DeclContext *getCommonAncestor() const { return CommonAncestor; } 2932 2933 /// Return the location of the \c using keyword. 2934 SourceLocation getUsingLoc() const { return UsingLoc; } 2935 2936 // FIXME: Could omit 'Key' in name. 2937 /// Returns the location of the \c namespace keyword. 2938 SourceLocation getNamespaceKeyLocation() const { return NamespaceLoc; } 2939 2940 /// Returns the location of this using declaration's identifier. 2941 SourceLocation getIdentLocation() const { return getLocation(); } 2942 2943 static UsingDirectiveDecl *Create(ASTContext &C, DeclContext *DC, 2944 SourceLocation UsingLoc, 2945 SourceLocation NamespaceLoc, 2946 NestedNameSpecifierLoc QualifierLoc, 2947 SourceLocation IdentLoc, 2948 NamedDecl *Nominated, 2949 DeclContext *CommonAncestor); 2950 static UsingDirectiveDecl *CreateDeserialized(ASTContext &C, unsigned ID); 2951 2952 SourceRange getSourceRange() const override LLVM_READONLY { 2953 return SourceRange(UsingLoc, getLocation()); 2954 } 2955 2956 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 2957 static bool classofKind(Kind K) { return K == UsingDirective; } 2958}; 2959 2960/// Represents a C++ namespace alias. 2961/// 2962/// For example: 2963/// 2964/// \code 2965/// namespace Foo = Bar; 2966/// \endcode 2967class NamespaceAliasDecl : public NamedDecl, 2968 public Redeclarable<NamespaceAliasDecl> { 2969 friend class ASTDeclReader; 2970 2971 /// The location of the \c namespace keyword. 2972 SourceLocation NamespaceLoc; 2973 2974 /// The location of the namespace's identifier. 2975 /// 2976 /// This is accessed by TargetNameLoc. 2977 SourceLocation IdentLoc; 2978 2979 /// The nested-name-specifier that precedes the namespace. 2980 NestedNameSpecifierLoc QualifierLoc; 2981 2982 /// The Decl that this alias points to, either a NamespaceDecl or 2983 /// a NamespaceAliasDecl. 2984 NamedDecl *Namespace; 2985 2986 NamespaceAliasDecl(ASTContext &C, DeclContext *DC, 2987 SourceLocation NamespaceLoc, SourceLocation AliasLoc, 2988 IdentifierInfo *Alias, NestedNameSpecifierLoc QualifierLoc, 2989 SourceLocation IdentLoc, NamedDecl *Namespace) 2990 : NamedDecl(NamespaceAlias, DC, AliasLoc, Alias), redeclarable_base(C), 2991 NamespaceLoc(NamespaceLoc), IdentLoc(IdentLoc), 2992 QualifierLoc(QualifierLoc), Namespace(Namespace) {} 2993 2994 void anchor() override; 2995 2996 using redeclarable_base = Redeclarable<NamespaceAliasDecl>; 2997 2998 NamespaceAliasDecl *getNextRedeclarationImpl() override; 2999 NamespaceAliasDecl *getPreviousDeclImpl() override; 3000 NamespaceAliasDecl *getMostRecentDeclImpl() override; 3001 3002public: 3003 static NamespaceAliasDecl *Create(ASTContext &C, DeclContext *DC, 3004 SourceLocation NamespaceLoc, 3005 SourceLocation AliasLoc, 3006 IdentifierInfo *Alias, 3007 NestedNameSpecifierLoc QualifierLoc, 3008 SourceLocation IdentLoc, 3009 NamedDecl *Namespace); 3010 3011 static NamespaceAliasDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3012 3013 using redecl_range = redeclarable_base::redecl_range; 3014 using redecl_iterator = redeclarable_base::redecl_iterator; 3015 3016 using redeclarable_base::redecls_begin; 3017 using redeclarable_base::redecls_end; 3018 using redeclarable_base::redecls; 3019 using redeclarable_base::getPreviousDecl; 3020 using redeclarable_base::getMostRecentDecl; 3021 3022 NamespaceAliasDecl *getCanonicalDecl() override { 3023 return getFirstDecl(); 3024 } 3025 const NamespaceAliasDecl *getCanonicalDecl() const { 3026 return getFirstDecl(); 3027 } 3028 3029 /// Retrieve the nested-name-specifier that qualifies the 3030 /// name of the namespace, with source-location information. 3031 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3032 3033 /// Retrieve the nested-name-specifier that qualifies the 3034 /// name of the namespace. 3035 NestedNameSpecifier *getQualifier() const { 3036 return QualifierLoc.getNestedNameSpecifier(); 3037 } 3038 3039 /// Retrieve the namespace declaration aliased by this directive. 3040 NamespaceDecl *getNamespace() { 3041 if (auto *AD = dyn_cast<NamespaceAliasDecl>(Namespace)) 3042 return AD->getNamespace(); 3043 3044 return cast<NamespaceDecl>(Namespace); 3045 } 3046 3047 const NamespaceDecl *getNamespace() const { 3048 return const_cast<NamespaceAliasDecl *>(this)->getNamespace(); 3049 } 3050 3051 /// Returns the location of the alias name, i.e. 'foo' in 3052 /// "namespace foo = ns::bar;". 3053 SourceLocation getAliasLoc() const { return getLocation(); } 3054 3055 /// Returns the location of the \c namespace keyword. 3056 SourceLocation getNamespaceLoc() const { return NamespaceLoc; } 3057 3058 /// Returns the location of the identifier in the named namespace. 3059 SourceLocation getTargetNameLoc() const { return IdentLoc; } 3060 3061 /// Retrieve the namespace that this alias refers to, which 3062 /// may either be a NamespaceDecl or a NamespaceAliasDecl. 3063 NamedDecl *getAliasedNamespace() const { return Namespace; } 3064 3065 SourceRange getSourceRange() const override LLVM_READONLY { 3066 return SourceRange(NamespaceLoc, IdentLoc); 3067 } 3068 3069 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3070 static bool classofKind(Kind K) { return K == NamespaceAlias; } 3071}; 3072 3073/// Implicit declaration of a temporary that was materialized by 3074/// a MaterializeTemporaryExpr and lifetime-extended by a declaration 3075class LifetimeExtendedTemporaryDecl final 3076 : public Decl, 3077 public Mergeable<LifetimeExtendedTemporaryDecl> { 3078 friend class MaterializeTemporaryExpr; 3079 friend class ASTDeclReader; 3080 3081 Stmt *ExprWithTemporary = nullptr; 3082 3083 /// The declaration which lifetime-extended this reference, if any. 3084 /// Either a VarDecl, or (for a ctor-initializer) a FieldDecl. 3085 ValueDecl *ExtendingDecl = nullptr; 3086 unsigned ManglingNumber; 3087 3088 mutable APValue *Value = nullptr; 3089 3090 virtual void anchor(); 3091 3092 LifetimeExtendedTemporaryDecl(Expr *Temp, ValueDecl *EDecl, unsigned Mangling) 3093 : Decl(Decl::LifetimeExtendedTemporary, EDecl->getDeclContext(), 3094 EDecl->getLocation()), 3095 ExprWithTemporary(Temp), ExtendingDecl(EDecl), 3096 ManglingNumber(Mangling) {} 3097 3098 LifetimeExtendedTemporaryDecl(EmptyShell) 3099 : Decl(Decl::LifetimeExtendedTemporary, EmptyShell{}) {} 3100 3101public: 3102 static LifetimeExtendedTemporaryDecl *Create(Expr *Temp, ValueDecl *EDec, 3103 unsigned Mangling) { 3104 return new (EDec->getASTContext(), EDec->getDeclContext()) 3105 LifetimeExtendedTemporaryDecl(Temp, EDec, Mangling); 3106 } 3107 static LifetimeExtendedTemporaryDecl *CreateDeserialized(ASTContext &C, 3108 unsigned ID) { 3109 return new (C, ID) LifetimeExtendedTemporaryDecl(EmptyShell{}); 3110 } 3111 3112 ValueDecl *getExtendingDecl() { return ExtendingDecl; } 3113 const ValueDecl *getExtendingDecl() const { return ExtendingDecl; } 3114 3115 /// Retrieve the storage duration for the materialized temporary. 3116 StorageDuration getStorageDuration() const; 3117 3118 /// Retrieve the expression to which the temporary materialization conversion 3119 /// was applied. This isn't necessarily the initializer of the temporary due 3120 /// to the C++98 delayed materialization rules, but 3121 /// skipRValueSubobjectAdjustments can be used to find said initializer within 3122 /// the subexpression. 3123 Expr *getTemporaryExpr() { return cast<Expr>(ExprWithTemporary); } 3124 const Expr *getTemporaryExpr() const { return cast<Expr>(ExprWithTemporary); } 3125 3126 unsigned getManglingNumber() const { return ManglingNumber; } 3127 3128 /// Get the storage for the constant value of a materialized temporary 3129 /// of static storage duration. 3130 APValue *getOrCreateValue(bool MayCreate) const; 3131 3132 APValue *getValue() const { return Value; } 3133 3134 // Iterators 3135 Stmt::child_range childrenExpr() { 3136 return Stmt::child_range(&ExprWithTemporary, &ExprWithTemporary + 1); 3137 } 3138 3139 Stmt::const_child_range childrenExpr() const { 3140 return Stmt::const_child_range(&ExprWithTemporary, &ExprWithTemporary + 1); 3141 } 3142 3143 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3144 static bool classofKind(Kind K) { 3145 return K == Decl::LifetimeExtendedTemporary; 3146 } 3147}; 3148 3149/// Represents a shadow declaration introduced into a scope by a 3150/// (resolved) using declaration. 3151/// 3152/// For example, 3153/// \code 3154/// namespace A { 3155/// void foo(); 3156/// } 3157/// namespace B { 3158/// using A::foo; // <- a UsingDecl 3159/// // Also creates a UsingShadowDecl for A::foo() in B 3160/// } 3161/// \endcode 3162class UsingShadowDecl : public NamedDecl, public Redeclarable<UsingShadowDecl> { 3163 friend class UsingDecl; 3164 3165 /// The referenced declaration. 3166 NamedDecl *Underlying = nullptr; 3167 3168 /// The using declaration which introduced this decl or the next using 3169 /// shadow declaration contained in the aforementioned using declaration. 3170 NamedDecl *UsingOrNextShadow = nullptr; 3171 3172 void anchor() override; 3173 3174 using redeclarable_base = Redeclarable<UsingShadowDecl>; 3175 3176 UsingShadowDecl *getNextRedeclarationImpl() override { 3177 return getNextRedeclaration(); 3178 } 3179 3180 UsingShadowDecl *getPreviousDeclImpl() override { 3181 return getPreviousDecl(); 3182 } 3183 3184 UsingShadowDecl *getMostRecentDeclImpl() override { 3185 return getMostRecentDecl(); 3186 } 3187 3188protected: 3189 UsingShadowDecl(Kind K, ASTContext &C, DeclContext *DC, SourceLocation Loc, 3190 UsingDecl *Using, NamedDecl *Target); 3191 UsingShadowDecl(Kind K, ASTContext &C, EmptyShell); 3192 3193public: 3194 friend class ASTDeclReader; 3195 friend class ASTDeclWriter; 3196 3197 static UsingShadowDecl *Create(ASTContext &C, DeclContext *DC, 3198 SourceLocation Loc, UsingDecl *Using, 3199 NamedDecl *Target) { 3200 return new (C, DC) UsingShadowDecl(UsingShadow, C, DC, Loc, Using, Target); 3201 } 3202 3203 static UsingShadowDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3204 3205 using redecl_range = redeclarable_base::redecl_range; 3206 using redecl_iterator = redeclarable_base::redecl_iterator; 3207 3208 using redeclarable_base::redecls_begin; 3209 using redeclarable_base::redecls_end; 3210 using redeclarable_base::redecls; 3211 using redeclarable_base::getPreviousDecl; 3212 using redeclarable_base::getMostRecentDecl; 3213 using redeclarable_base::isFirstDecl; 3214 3215 UsingShadowDecl *getCanonicalDecl() override { 3216 return getFirstDecl(); 3217 } 3218 const UsingShadowDecl *getCanonicalDecl() const { 3219 return getFirstDecl(); 3220 } 3221 3222 /// Gets the underlying declaration which has been brought into the 3223 /// local scope. 3224 NamedDecl *getTargetDecl() const { return Underlying; } 3225 3226 /// Sets the underlying declaration which has been brought into the 3227 /// local scope. 3228 void setTargetDecl(NamedDecl *ND) { 3229 assert(ND && "Target decl is null!"); 3230 Underlying = ND; 3231 // A UsingShadowDecl is never a friend or local extern declaration, even 3232 // if it is a shadow declaration for one. 3233 IdentifierNamespace = 3234 ND->getIdentifierNamespace() & 3235 ~(IDNS_OrdinaryFriend | IDNS_TagFriend | IDNS_LocalExtern); 3236 } 3237 3238 /// Gets the using declaration to which this declaration is tied. 3239 UsingDecl *getUsingDecl() const; 3240 3241 /// The next using shadow declaration contained in the shadow decl 3242 /// chain of the using declaration which introduced this decl. 3243 UsingShadowDecl *getNextUsingShadowDecl() const { 3244 return dyn_cast_or_null<UsingShadowDecl>(UsingOrNextShadow); 3245 } 3246 3247 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3248 static bool classofKind(Kind K) { 3249 return K == Decl::UsingShadow || K == Decl::ConstructorUsingShadow; 3250 } 3251}; 3252 3253/// Represents a shadow constructor declaration introduced into a 3254/// class by a C++11 using-declaration that names a constructor. 3255/// 3256/// For example: 3257/// \code 3258/// struct Base { Base(int); }; 3259/// struct Derived { 3260/// using Base::Base; // creates a UsingDecl and a ConstructorUsingShadowDecl 3261/// }; 3262/// \endcode 3263class ConstructorUsingShadowDecl final : public UsingShadowDecl { 3264 /// If this constructor using declaration inherted the constructor 3265 /// from an indirect base class, this is the ConstructorUsingShadowDecl 3266 /// in the named direct base class from which the declaration was inherited. 3267 ConstructorUsingShadowDecl *NominatedBaseClassShadowDecl = nullptr; 3268 3269 /// If this constructor using declaration inherted the constructor 3270 /// from an indirect base class, this is the ConstructorUsingShadowDecl 3271 /// that will be used to construct the unique direct or virtual base class 3272 /// that receives the constructor arguments. 3273 ConstructorUsingShadowDecl *ConstructedBaseClassShadowDecl = nullptr; 3274 3275 /// \c true if the constructor ultimately named by this using shadow 3276 /// declaration is within a virtual base class subobject of the class that 3277 /// contains this declaration. 3278 unsigned IsVirtual : 1; 3279 3280 ConstructorUsingShadowDecl(ASTContext &C, DeclContext *DC, SourceLocation Loc, 3281 UsingDecl *Using, NamedDecl *Target, 3282 bool TargetInVirtualBase) 3283 : UsingShadowDecl(ConstructorUsingShadow, C, DC, Loc, Using, 3284 Target->getUnderlyingDecl()), 3285 NominatedBaseClassShadowDecl( 3286 dyn_cast<ConstructorUsingShadowDecl>(Target)), 3287 ConstructedBaseClassShadowDecl(NominatedBaseClassShadowDecl), 3288 IsVirtual(TargetInVirtualBase) { 3289 // If we found a constructor that chains to a constructor for a virtual 3290 // base, we should directly call that virtual base constructor instead. 3291 // FIXME: This logic belongs in Sema. 3292 if (NominatedBaseClassShadowDecl && 3293 NominatedBaseClassShadowDecl->constructsVirtualBase()) { 3294 ConstructedBaseClassShadowDecl = 3295 NominatedBaseClassShadowDecl->ConstructedBaseClassShadowDecl; 3296 IsVirtual = true; 3297 } 3298 } 3299 3300 ConstructorUsingShadowDecl(ASTContext &C, EmptyShell Empty) 3301 : UsingShadowDecl(ConstructorUsingShadow, C, Empty), IsVirtual(false) {} 3302 3303 void anchor() override; 3304 3305public: 3306 friend class ASTDeclReader; 3307 friend class ASTDeclWriter; 3308 3309 static ConstructorUsingShadowDecl *Create(ASTContext &C, DeclContext *DC, 3310 SourceLocation Loc, 3311 UsingDecl *Using, NamedDecl *Target, 3312 bool IsVirtual); 3313 static ConstructorUsingShadowDecl *CreateDeserialized(ASTContext &C, 3314 unsigned ID); 3315 3316 /// Returns the parent of this using shadow declaration, which 3317 /// is the class in which this is declared. 3318 //@{ 3319 const CXXRecordDecl *getParent() const { 3320 return cast<CXXRecordDecl>(getDeclContext()); 3321 } 3322 CXXRecordDecl *getParent() { 3323 return cast<CXXRecordDecl>(getDeclContext()); 3324 } 3325 //@} 3326 3327 /// Get the inheriting constructor declaration for the direct base 3328 /// class from which this using shadow declaration was inherited, if there is 3329 /// one. This can be different for each redeclaration of the same shadow decl. 3330 ConstructorUsingShadowDecl *getNominatedBaseClassShadowDecl() const { 3331 return NominatedBaseClassShadowDecl; 3332 } 3333 3334 /// Get the inheriting constructor declaration for the base class 3335 /// for which we don't have an explicit initializer, if there is one. 3336 ConstructorUsingShadowDecl *getConstructedBaseClassShadowDecl() const { 3337 return ConstructedBaseClassShadowDecl; 3338 } 3339 3340 /// Get the base class that was named in the using declaration. This 3341 /// can be different for each redeclaration of this same shadow decl. 3342 CXXRecordDecl *getNominatedBaseClass() const; 3343 3344 /// Get the base class whose constructor or constructor shadow 3345 /// declaration is passed the constructor arguments. 3346 CXXRecordDecl *getConstructedBaseClass() const { 3347 return cast<CXXRecordDecl>((ConstructedBaseClassShadowDecl 3348 ? ConstructedBaseClassShadowDecl 3349 : getTargetDecl()) 3350 ->getDeclContext()); 3351 } 3352 3353 /// Returns \c true if the constructed base class is a virtual base 3354 /// class subobject of this declaration's class. 3355 bool constructsVirtualBase() const { 3356 return IsVirtual; 3357 } 3358 3359 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3360 static bool classofKind(Kind K) { return K == ConstructorUsingShadow; } 3361}; 3362 3363/// Represents a C++ using-declaration. 3364/// 3365/// For example: 3366/// \code 3367/// using someNameSpace::someIdentifier; 3368/// \endcode 3369class UsingDecl : public NamedDecl, public Mergeable<UsingDecl> { 3370 /// The source location of the 'using' keyword itself. 3371 SourceLocation UsingLocation; 3372 3373 /// The nested-name-specifier that precedes the name. 3374 NestedNameSpecifierLoc QualifierLoc; 3375 3376 /// Provides source/type location info for the declaration name 3377 /// embedded in the ValueDecl base class. 3378 DeclarationNameLoc DNLoc; 3379 3380 /// The first shadow declaration of the shadow decl chain associated 3381 /// with this using declaration. 3382 /// 3383 /// The bool member of the pair store whether this decl has the \c typename 3384 /// keyword. 3385 llvm::PointerIntPair<UsingShadowDecl *, 1, bool> FirstUsingShadow; 3386 3387 UsingDecl(DeclContext *DC, SourceLocation UL, 3388 NestedNameSpecifierLoc QualifierLoc, 3389 const DeclarationNameInfo &NameInfo, bool HasTypenameKeyword) 3390 : NamedDecl(Using, DC, NameInfo.getLoc(), NameInfo.getName()), 3391 UsingLocation(UL), QualifierLoc(QualifierLoc), 3392 DNLoc(NameInfo.getInfo()), FirstUsingShadow(nullptr, HasTypenameKeyword) { 3393 } 3394 3395 void anchor() override; 3396 3397public: 3398 friend class ASTDeclReader; 3399 friend class ASTDeclWriter; 3400 3401 /// Return the source location of the 'using' keyword. 3402 SourceLocation getUsingLoc() const { return UsingLocation; } 3403 3404 /// Set the source location of the 'using' keyword. 3405 void setUsingLoc(SourceLocation L) { UsingLocation = L; } 3406 3407 /// Retrieve the nested-name-specifier that qualifies the name, 3408 /// with source-location information. 3409 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3410 3411 /// Retrieve the nested-name-specifier that qualifies the name. 3412 NestedNameSpecifier *getQualifier() const { 3413 return QualifierLoc.getNestedNameSpecifier(); 3414 } 3415 3416 DeclarationNameInfo getNameInfo() const { 3417 return DeclarationNameInfo(getDeclName(), getLocation(), DNLoc); 3418 } 3419 3420 /// Return true if it is a C++03 access declaration (no 'using'). 3421 bool isAccessDeclaration() const { return UsingLocation.isInvalid(); } 3422 3423 /// Return true if the using declaration has 'typename'. 3424 bool hasTypename() const { return FirstUsingShadow.getInt(); } 3425 3426 /// Sets whether the using declaration has 'typename'. 3427 void setTypename(bool TN) { FirstUsingShadow.setInt(TN); } 3428 3429 /// Iterates through the using shadow declarations associated with 3430 /// this using declaration. 3431 class shadow_iterator { 3432 /// The current using shadow declaration. 3433 UsingShadowDecl *Current = nullptr; 3434 3435 public: 3436 using value_type = UsingShadowDecl *; 3437 using reference = UsingShadowDecl *; 3438 using pointer = UsingShadowDecl *; 3439 using iterator_category = std::forward_iterator_tag; 3440 using difference_type = std::ptrdiff_t; 3441 3442 shadow_iterator() = default; 3443 explicit shadow_iterator(UsingShadowDecl *C) : Current(C) {} 3444 3445 reference operator*() const { return Current; } 3446 pointer operator->() const { return Current; } 3447 3448 shadow_iterator& operator++() { 3449 Current = Current->getNextUsingShadowDecl(); 3450 return *this; 3451 } 3452 3453 shadow_iterator operator++(int) { 3454 shadow_iterator tmp(*this); 3455 ++(*this); 3456 return tmp; 3457 } 3458 3459 friend bool operator==(shadow_iterator x, shadow_iterator y) { 3460 return x.Current == y.Current; 3461 } 3462 friend bool operator!=(shadow_iterator x, shadow_iterator y) { 3463 return x.Current != y.Current; 3464 } 3465 }; 3466 3467 using shadow_range = llvm::iterator_range<shadow_iterator>; 3468 3469 shadow_range shadows() const { 3470 return shadow_range(shadow_begin(), shadow_end()); 3471 } 3472 3473 shadow_iterator shadow_begin() const { 3474 return shadow_iterator(FirstUsingShadow.getPointer()); 3475 } 3476 3477 shadow_iterator shadow_end() const { return shadow_iterator(); } 3478 3479 /// Return the number of shadowed declarations associated with this 3480 /// using declaration. 3481 unsigned shadow_size() const { 3482 return std::distance(shadow_begin(), shadow_end()); 3483 } 3484 3485 void addShadowDecl(UsingShadowDecl *S); 3486 void removeShadowDecl(UsingShadowDecl *S); 3487 3488 static UsingDecl *Create(ASTContext &C, DeclContext *DC, 3489 SourceLocation UsingL, 3490 NestedNameSpecifierLoc QualifierLoc, 3491 const DeclarationNameInfo &NameInfo, 3492 bool HasTypenameKeyword); 3493 3494 static UsingDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3495 3496 SourceRange getSourceRange() const override LLVM_READONLY; 3497 3498 /// Retrieves the canonical declaration of this declaration. 3499 UsingDecl *getCanonicalDecl() override { return getFirstDecl(); } 3500 const UsingDecl *getCanonicalDecl() const { return getFirstDecl(); } 3501 3502 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3503 static bool classofKind(Kind K) { return K == Using; } 3504}; 3505 3506/// Represents a pack of using declarations that a single 3507/// using-declarator pack-expanded into. 3508/// 3509/// \code 3510/// template<typename ...T> struct X : T... { 3511/// using T::operator()...; 3512/// using T::operator T...; 3513/// }; 3514/// \endcode 3515/// 3516/// In the second case above, the UsingPackDecl will have the name 3517/// 'operator T' (which contains an unexpanded pack), but the individual 3518/// UsingDecls and UsingShadowDecls will have more reasonable names. 3519class UsingPackDecl final 3520 : public NamedDecl, public Mergeable<UsingPackDecl>, 3521 private llvm::TrailingObjects<UsingPackDecl, NamedDecl *> { 3522 /// The UnresolvedUsingValueDecl or UnresolvedUsingTypenameDecl from 3523 /// which this waas instantiated. 3524 NamedDecl *InstantiatedFrom; 3525 3526 /// The number of using-declarations created by this pack expansion. 3527 unsigned NumExpansions; 3528 3529 UsingPackDecl(DeclContext *DC, NamedDecl *InstantiatedFrom, 3530 ArrayRef<NamedDecl *> UsingDecls) 3531 : NamedDecl(UsingPack, DC, 3532 InstantiatedFrom ? InstantiatedFrom->getLocation() 3533 : SourceLocation(), 3534 InstantiatedFrom ? InstantiatedFrom->getDeclName() 3535 : DeclarationName()), 3536 InstantiatedFrom(InstantiatedFrom), NumExpansions(UsingDecls.size()) { 3537 std::uninitialized_copy(UsingDecls.begin(), UsingDecls.end(), 3538 getTrailingObjects<NamedDecl *>()); 3539 } 3540 3541 void anchor() override; 3542 3543public: 3544 friend class ASTDeclReader; 3545 friend class ASTDeclWriter; 3546 friend TrailingObjects; 3547 3548 /// Get the using declaration from which this was instantiated. This will 3549 /// always be an UnresolvedUsingValueDecl or an UnresolvedUsingTypenameDecl 3550 /// that is a pack expansion. 3551 NamedDecl *getInstantiatedFromUsingDecl() const { return InstantiatedFrom; } 3552 3553 /// Get the set of using declarations that this pack expanded into. Note that 3554 /// some of these may still be unresolved. 3555 ArrayRef<NamedDecl *> expansions() const { 3556 return llvm::makeArrayRef(getTrailingObjects<NamedDecl *>(), NumExpansions); 3557 } 3558 3559 static UsingPackDecl *Create(ASTContext &C, DeclContext *DC, 3560 NamedDecl *InstantiatedFrom, 3561 ArrayRef<NamedDecl *> UsingDecls); 3562 3563 static UsingPackDecl *CreateDeserialized(ASTContext &C, unsigned ID, 3564 unsigned NumExpansions); 3565 3566 SourceRange getSourceRange() const override LLVM_READONLY { 3567 return InstantiatedFrom->getSourceRange(); 3568 } 3569 3570 UsingPackDecl *getCanonicalDecl() override { return getFirstDecl(); } 3571 const UsingPackDecl *getCanonicalDecl() const { return getFirstDecl(); } 3572 3573 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3574 static bool classofKind(Kind K) { return K == UsingPack; } 3575}; 3576 3577/// Represents a dependent using declaration which was not marked with 3578/// \c typename. 3579/// 3580/// Unlike non-dependent using declarations, these *only* bring through 3581/// non-types; otherwise they would break two-phase lookup. 3582/// 3583/// \code 3584/// template \<class T> class A : public Base<T> { 3585/// using Base<T>::foo; 3586/// }; 3587/// \endcode 3588class UnresolvedUsingValueDecl : public ValueDecl, 3589 public Mergeable<UnresolvedUsingValueDecl> { 3590 /// The source location of the 'using' keyword 3591 SourceLocation UsingLocation; 3592 3593 /// If this is a pack expansion, the location of the '...'. 3594 SourceLocation EllipsisLoc; 3595 3596 /// The nested-name-specifier that precedes the name. 3597 NestedNameSpecifierLoc QualifierLoc; 3598 3599 /// Provides source/type location info for the declaration name 3600 /// embedded in the ValueDecl base class. 3601 DeclarationNameLoc DNLoc; 3602 3603 UnresolvedUsingValueDecl(DeclContext *DC, QualType Ty, 3604 SourceLocation UsingLoc, 3605 NestedNameSpecifierLoc QualifierLoc, 3606 const DeclarationNameInfo &NameInfo, 3607 SourceLocation EllipsisLoc) 3608 : ValueDecl(UnresolvedUsingValue, DC, 3609 NameInfo.getLoc(), NameInfo.getName(), Ty), 3610 UsingLocation(UsingLoc), EllipsisLoc(EllipsisLoc), 3611 QualifierLoc(QualifierLoc), DNLoc(NameInfo.getInfo()) {} 3612 3613 void anchor() override; 3614 3615public: 3616 friend class ASTDeclReader; 3617 friend class ASTDeclWriter; 3618 3619 /// Returns the source location of the 'using' keyword. 3620 SourceLocation getUsingLoc() const { return UsingLocation; } 3621 3622 /// Set the source location of the 'using' keyword. 3623 void setUsingLoc(SourceLocation L) { UsingLocation = L; } 3624 3625 /// Return true if it is a C++03 access declaration (no 'using'). 3626 bool isAccessDeclaration() const { return UsingLocation.isInvalid(); } 3627 3628 /// Retrieve the nested-name-specifier that qualifies the name, 3629 /// with source-location information. 3630 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3631 3632 /// Retrieve the nested-name-specifier that qualifies the name. 3633 NestedNameSpecifier *getQualifier() const { 3634 return QualifierLoc.getNestedNameSpecifier(); 3635 } 3636 3637 DeclarationNameInfo getNameInfo() const { 3638 return DeclarationNameInfo(getDeclName(), getLocation(), DNLoc); 3639 } 3640 3641 /// Determine whether this is a pack expansion. 3642 bool isPackExpansion() const { 3643 return EllipsisLoc.isValid(); 3644 } 3645 3646 /// Get the location of the ellipsis if this is a pack expansion. 3647 SourceLocation getEllipsisLoc() const { 3648 return EllipsisLoc; 3649 } 3650 3651 static UnresolvedUsingValueDecl * 3652 Create(ASTContext &C, DeclContext *DC, SourceLocation UsingLoc, 3653 NestedNameSpecifierLoc QualifierLoc, 3654 const DeclarationNameInfo &NameInfo, SourceLocation EllipsisLoc); 3655 3656 static UnresolvedUsingValueDecl * 3657 CreateDeserialized(ASTContext &C, unsigned ID); 3658 3659 SourceRange getSourceRange() const override LLVM_READONLY; 3660 3661 /// Retrieves the canonical declaration of this declaration. 3662 UnresolvedUsingValueDecl *getCanonicalDecl() override { 3663 return getFirstDecl(); 3664 } 3665 const UnresolvedUsingValueDecl *getCanonicalDecl() const { 3666 return getFirstDecl(); 3667 } 3668 3669 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3670 static bool classofKind(Kind K) { return K == UnresolvedUsingValue; } 3671}; 3672 3673/// Represents a dependent using declaration which was marked with 3674/// \c typename. 3675/// 3676/// \code 3677/// template \<class T> class A : public Base<T> { 3678/// using typename Base<T>::foo; 3679/// }; 3680/// \endcode 3681/// 3682/// The type associated with an unresolved using typename decl is 3683/// currently always a typename type. 3684class UnresolvedUsingTypenameDecl 3685 : public TypeDecl, 3686 public Mergeable<UnresolvedUsingTypenameDecl> { 3687 friend class ASTDeclReader; 3688 3689 /// The source location of the 'typename' keyword 3690 SourceLocation TypenameLocation; 3691 3692 /// If this is a pack expansion, the location of the '...'. 3693 SourceLocation EllipsisLoc; 3694 3695 /// The nested-name-specifier that precedes the name. 3696 NestedNameSpecifierLoc QualifierLoc; 3697 3698 UnresolvedUsingTypenameDecl(DeclContext *DC, SourceLocation UsingLoc, 3699 SourceLocation TypenameLoc, 3700 NestedNameSpecifierLoc QualifierLoc, 3701 SourceLocation TargetNameLoc, 3702 IdentifierInfo *TargetName, 3703 SourceLocation EllipsisLoc) 3704 : TypeDecl(UnresolvedUsingTypename, DC, TargetNameLoc, TargetName, 3705 UsingLoc), 3706 TypenameLocation(TypenameLoc), EllipsisLoc(EllipsisLoc), 3707 QualifierLoc(QualifierLoc) {} 3708 3709 void anchor() override; 3710 3711public: 3712 /// Returns the source location of the 'using' keyword. 3713 SourceLocation getUsingLoc() const { return getBeginLoc(); } 3714 3715 /// Returns the source location of the 'typename' keyword. 3716 SourceLocation getTypenameLoc() const { return TypenameLocation; } 3717 3718 /// Retrieve the nested-name-specifier that qualifies the name, 3719 /// with source-location information. 3720 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; } 3721 3722 /// Retrieve the nested-name-specifier that qualifies the name. 3723 NestedNameSpecifier *getQualifier() const { 3724 return QualifierLoc.getNestedNameSpecifier(); 3725 } 3726 3727 DeclarationNameInfo getNameInfo() const { 3728 return DeclarationNameInfo(getDeclName(), getLocation()); 3729 } 3730 3731 /// Determine whether this is a pack expansion. 3732 bool isPackExpansion() const { 3733 return EllipsisLoc.isValid(); 3734 } 3735 3736 /// Get the location of the ellipsis if this is a pack expansion. 3737 SourceLocation getEllipsisLoc() const { 3738 return EllipsisLoc; 3739 } 3740 3741 static UnresolvedUsingTypenameDecl * 3742 Create(ASTContext &C, DeclContext *DC, SourceLocation UsingLoc, 3743 SourceLocation TypenameLoc, NestedNameSpecifierLoc QualifierLoc, 3744 SourceLocation TargetNameLoc, DeclarationName TargetName, 3745 SourceLocation EllipsisLoc); 3746 3747 static UnresolvedUsingTypenameDecl * 3748 CreateDeserialized(ASTContext &C, unsigned ID); 3749 3750 /// Retrieves the canonical declaration of this declaration. 3751 UnresolvedUsingTypenameDecl *getCanonicalDecl() override { 3752 return getFirstDecl(); 3753 } 3754 const UnresolvedUsingTypenameDecl *getCanonicalDecl() const { 3755 return getFirstDecl(); 3756 } 3757 3758 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3759 static bool classofKind(Kind K) { return K == UnresolvedUsingTypename; } 3760}; 3761 3762/// Represents a C++11 static_assert declaration. 3763class StaticAssertDecl : public Decl { 3764 llvm::PointerIntPair<Expr *, 1, bool> AssertExprAndFailed; 3765 StringLiteral *Message; 3766 SourceLocation RParenLoc; 3767 3768 StaticAssertDecl(DeclContext *DC, SourceLocation StaticAssertLoc, 3769 Expr *AssertExpr, StringLiteral *Message, 3770 SourceLocation RParenLoc, bool Failed) 3771 : Decl(StaticAssert, DC, StaticAssertLoc), 3772 AssertExprAndFailed(AssertExpr, Failed), Message(Message), 3773 RParenLoc(RParenLoc) {} 3774 3775 virtual void anchor(); 3776 3777public: 3778 friend class ASTDeclReader; 3779 3780 static StaticAssertDecl *Create(ASTContext &C, DeclContext *DC, 3781 SourceLocation StaticAssertLoc, 3782 Expr *AssertExpr, StringLiteral *Message, 3783 SourceLocation RParenLoc, bool Failed); 3784 static StaticAssertDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3785 3786 Expr *getAssertExpr() { return AssertExprAndFailed.getPointer(); } 3787 const Expr *getAssertExpr() const { return AssertExprAndFailed.getPointer(); } 3788 3789 StringLiteral *getMessage() { return Message; } 3790 const StringLiteral *getMessage() const { return Message; } 3791 3792 bool isFailed() const { return AssertExprAndFailed.getInt(); } 3793 3794 SourceLocation getRParenLoc() const { return RParenLoc; } 3795 3796 SourceRange getSourceRange() const override LLVM_READONLY { 3797 return SourceRange(getLocation(), getRParenLoc()); 3798 } 3799 3800 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3801 static bool classofKind(Kind K) { return K == StaticAssert; } 3802}; 3803 3804/// A binding in a decomposition declaration. For instance, given: 3805/// 3806/// int n[3]; 3807/// auto &[a, b, c] = n; 3808/// 3809/// a, b, and c are BindingDecls, whose bindings are the expressions 3810/// x[0], x[1], and x[2] respectively, where x is the implicit 3811/// DecompositionDecl of type 'int (&)[3]'. 3812class BindingDecl : public ValueDecl { 3813 /// The declaration that this binding binds to part of. 3814 LazyDeclPtr Decomp; 3815 /// The binding represented by this declaration. References to this 3816 /// declaration are effectively equivalent to this expression (except 3817 /// that it is only evaluated once at the point of declaration of the 3818 /// binding). 3819 Expr *Binding = nullptr; 3820 3821 BindingDecl(DeclContext *DC, SourceLocation IdLoc, IdentifierInfo *Id) 3822 : ValueDecl(Decl::Binding, DC, IdLoc, Id, QualType()) {} 3823 3824 void anchor() override; 3825 3826public: 3827 friend class ASTDeclReader; 3828 3829 static BindingDecl *Create(ASTContext &C, DeclContext *DC, 3830 SourceLocation IdLoc, IdentifierInfo *Id); 3831 static BindingDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3832 3833 /// Get the expression to which this declaration is bound. This may be null 3834 /// in two different cases: while parsing the initializer for the 3835 /// decomposition declaration, and when the initializer is type-dependent. 3836 Expr *getBinding() const { return Binding; } 3837 3838 /// Get the decomposition declaration that this binding represents a 3839 /// decomposition of. 3840 ValueDecl *getDecomposedDecl() const; 3841 3842 /// Get the variable (if any) that holds the value of evaluating the binding. 3843 /// Only present for user-defined bindings for tuple-like types. 3844 VarDecl *getHoldingVar() const; 3845 3846 /// Set the binding for this BindingDecl, along with its declared type (which 3847 /// should be a possibly-cv-qualified form of the type of the binding, or a 3848 /// reference to such a type). 3849 void setBinding(QualType DeclaredType, Expr *Binding) { 3850 setType(DeclaredType); 3851 this->Binding = Binding; 3852 } 3853 3854 /// Set the decomposed variable for this BindingDecl. 3855 void setDecomposedDecl(ValueDecl *Decomposed) { Decomp = Decomposed; } 3856 3857 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3858 static bool classofKind(Kind K) { return K == Decl::Binding; } 3859}; 3860 3861/// A decomposition declaration. For instance, given: 3862/// 3863/// int n[3]; 3864/// auto &[a, b, c] = n; 3865/// 3866/// the second line declares a DecompositionDecl of type 'int (&)[3]', and 3867/// three BindingDecls (named a, b, and c). An instance of this class is always 3868/// unnamed, but behaves in almost all other respects like a VarDecl. 3869class DecompositionDecl final 3870 : public VarDecl, 3871 private llvm::TrailingObjects<DecompositionDecl, BindingDecl *> { 3872 /// The number of BindingDecl*s following this object. 3873 unsigned NumBindings; 3874 3875 DecompositionDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, 3876 SourceLocation LSquareLoc, QualType T, 3877 TypeSourceInfo *TInfo, StorageClass SC, 3878 ArrayRef<BindingDecl *> Bindings) 3879 : VarDecl(Decomposition, C, DC, StartLoc, LSquareLoc, nullptr, T, TInfo, 3880 SC), 3881 NumBindings(Bindings.size()) { 3882 std::uninitialized_copy(Bindings.begin(), Bindings.end(), 3883 getTrailingObjects<BindingDecl *>()); 3884 for (auto *B : Bindings) 3885 B->setDecomposedDecl(this); 3886 } 3887 3888 void anchor() override; 3889 3890public: 3891 friend class ASTDeclReader; 3892 friend TrailingObjects; 3893 3894 static DecompositionDecl *Create(ASTContext &C, DeclContext *DC, 3895 SourceLocation StartLoc, 3896 SourceLocation LSquareLoc, 3897 QualType T, TypeSourceInfo *TInfo, 3898 StorageClass S, 3899 ArrayRef<BindingDecl *> Bindings); 3900 static DecompositionDecl *CreateDeserialized(ASTContext &C, unsigned ID, 3901 unsigned NumBindings); 3902 3903 ArrayRef<BindingDecl *> bindings() const { 3904 return llvm::makeArrayRef(getTrailingObjects<BindingDecl *>(), NumBindings); 3905 } 3906 3907 void printName(raw_ostream &os) const override; 3908 3909 static bool classof(const Decl *D) { return classofKind(D->getKind()); } 3910 static bool classofKind(Kind K) { return K == Decomposition; } 3911}; 3912 3913/// An instance of this class represents the declaration of a property 3914/// member. This is a Microsoft extension to C++, first introduced in 3915/// Visual Studio .NET 2003 as a parallel to similar features in C# 3916/// and Managed C++. 3917/// 3918/// A property must always be a non-static class member. 3919/// 3920/// A property member superficially resembles a non-static data 3921/// member, except preceded by a property attribute: 3922/// __declspec(property(get=GetX, put=PutX)) int x; 3923/// Either (but not both) of the 'get' and 'put' names may be omitted. 3924/// 3925/// A reference to a property is always an lvalue. If the lvalue 3926/// undergoes lvalue-to-rvalue conversion, then a getter name is 3927/// required, and that member is called with no arguments. 3928/// If the lvalue is assigned into, then a setter name is required, 3929/// and that member is called with one argument, the value assigned. 3930/// Both operations are potentially overloaded. Compound assignments 3931/// are permitted, as are the increment and decrement operators. 3932/// 3933/// The getter and putter methods are permitted to be overloaded, 3934/// although their return and parameter types are subject to certain 3935/// restrictions according to the type of the property. 3936/// 3937/// A property declared using an incomplete array type may 3938/// additionally be subscripted, adding extra parameters to the getter 3939/// and putter methods. 3940class MSPropertyDecl : public DeclaratorDecl { 3941 IdentifierInfo *GetterId, *SetterId; 3942 3943 MSPropertyDecl(DeclContext *DC, SourceLocation L, DeclarationName N, 3944 QualType T, TypeSourceInfo *TInfo, SourceLocation StartL, 3945 IdentifierInfo *Getter, IdentifierInfo *Setter) 3946 : DeclaratorDecl(MSProperty, DC, L, N, T, TInfo, StartL), 3947 GetterId(Getter), SetterId(Setter) {} 3948 3949 void anchor() override; 3950public: 3951 friend class ASTDeclReader; 3952 3953 static MSPropertyDecl *Create(ASTContext &C, DeclContext *DC, 3954 SourceLocation L, DeclarationName N, QualType T, 3955 TypeSourceInfo *TInfo, SourceLocation StartL, 3956 IdentifierInfo *Getter, IdentifierInfo *Setter); 3957 static MSPropertyDecl *CreateDeserialized(ASTContext &C, unsigned ID); 3958 3959 static bool classof(const Decl *D) { return D->getKind() == MSProperty; } 3960 3961 bool hasGetter() const { return GetterId != nullptr; } 3962 IdentifierInfo* getGetterId() const { return GetterId; } 3963 bool hasSetter() const { return SetterId != nullptr; } 3964 IdentifierInfo* getSetterId() const { return SetterId; } 3965}; 3966 3967/// Insertion operator for diagnostics. This allows sending an AccessSpecifier 3968/// into a diagnostic with <<. 3969const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB, 3970 AccessSpecifier AS); 3971 3972const PartialDiagnostic &operator<<(const PartialDiagnostic &DB, 3973 AccessSpecifier AS); 3974 3975} // namespace clang 3976 3977#endif // LLVM_CLANG_AST_DECLCXX_H 3978