Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

 

 

 

namespace clang {

 

class ASTContext;

class ASTMutationListener;

class Attr;

class BlockDecl;

class DeclContext;

class ExternalSourceSymbolAttr;

class FunctionDecl;

class FunctionType;

class IdentifierInfo;

enum Linkage : unsigned char;

class LinkageSpecDecl;

class Module;

class NamedDecl;

class ObjCContainerDecl;

class ObjCMethodDecl;

struct PrintingPolicy;

class RecordDecl;

class SourceManager;

class Stmt;

class StoredDeclsMap;

class TemplateDecl;

class TemplateParameterList;

class TranslationUnitDecl;

class UsingDirectiveDecl;

 

enum AvailabilityResult {

  AR_Available = 0,

  AR_NotYetIntroduced,

  AR_Deprecated,

  AR_Unavailable

 

class alignas(8) Decl {

  /// Lists the kind of concrete classes of Decl.

  enum Kind {

  };

 

  /// A placeholder type used to construct an empty shell of a

  /// decl-derived type that will be filled in later (e.g., by some

  /// deserialization method).

  struct EmptyShell {};

 

  /// IdentifierNamespace - The different namespaces in which

  /// declarations may appear.  According to C99 6.2.3, there are

  /// four namespaces, labels, tags, members and ordinary

  /// identifiers.  C++ describes lookup completely differently:

  /// certain lookups merely "ignore" certain kinds of declarations,

  /// usually based on whether the declaration is of a type, etc.

  ///

  /// These are meant as bitmasks, so that searches in

  /// C++ can look into the "tag" namespace during ordinary lookup.

  ///

  /// Decl currently provides 15 bits of IDNS bits.

  enum IdentifierNamespace {

    /// Labels, declared with 'x:' and referenced with 'goto x'.

    IDNS_Label               = 0x0001,

 

    /// Tags, declared with 'struct foo;' and referenced with

    /// 'struct foo'.  All tags are also types.  This is what

    /// elaborated-type-specifiers look for in C.

    /// This also contains names that conflict with tags in the

    /// same scope but that are otherwise ordinary names (non-type

    /// template parameters and indirect field declarations).

    IDNS_Tag                 = 0x0002,

 

    /// Types, declared with 'struct foo', typedefs, etc.

    /// This is what elaborated-type-specifiers look for in C++,

    /// but note that it's ill-formed to find a non-tag.

    IDNS_Type                = 0x0004,

 

    /// Members, declared with object declarations within tag

    /// definitions.  In C, these can only be found by "qualified"

    /// lookup in member expressions.  In C++, they're found by

    /// normal lookup.

    IDNS_Member              = 0x0008,

 

    /// Namespaces, declared with 'namespace foo {}'.

    /// Lookup for nested-name-specifiers find these.

    IDNS_Namespace           = 0x0010,

 

    /// Ordinary names.  In C, everything that's not a label, tag,

    /// member, or function-local extern ends up here.

    IDNS_Ordinary            = 0x0020,

 

    /// Objective C \@protocol.

    IDNS_ObjCProtocol        = 0x0040,

 

    /// This declaration is a friend function.  A friend function

    /// declaration is always in this namespace but may also be in

    /// IDNS_Ordinary if it was previously declared.

    IDNS_OrdinaryFriend      = 0x0080,

 

    /// This declaration is a friend class.  A friend class

    /// declaration is always in this namespace but may also be in

    /// IDNS_Tag|IDNS_Type if it was previously declared.

    IDNS_TagFriend           = 0x0100,

 

    /// This declaration is a using declaration.  A using declaration

    /// *introduces* a number of other declarations into the current

    /// scope, and those declarations use the IDNS of their targets,

    /// but the actual using declarations go in this namespace.

    IDNS_Using               = 0x0200,

 

    /// This declaration is a C++ operator declared in a non-class

    /// context.  All such operators are also in IDNS_Ordinary.

    /// C++ lexical operator lookup looks for these.

    IDNS_NonMemberOperator   = 0x0400,

 

    /// This declaration is a function-local extern declaration of a

    /// variable or function. This may also be IDNS_Ordinary if it

    /// has been declared outside any function. These act mostly like

    /// invisible friend declarations, but are also visible to unqualified

    /// lookup within the scope of the declaring function.

    IDNS_LocalExtern         = 0x0800,

 

    /// This declaration is an OpenMP user defined reduction construction.

    IDNS_OMPReduction        = 0x1000,

 

    /// This declaration is an OpenMP user defined mapper.

    IDNS_OMPMapper           = 0x2000,

  };

 

  /// ObjCDeclQualifier - 'Qualifiers' written next to the return and

  /// parameter types in method declarations.  Other than remembering

  /// them and mangling them into the method's signature string, these

  /// are ignored by the compiler; they are consumed by certain

  /// remote-messaging frameworks.

  ///

  /// in, inout, and out are mutually exclusive and apply only to

  /// method parameters.  bycopy and byref are mutually exclusive and

  /// apply only to method parameters (?).  oneway applies only to

  /// results.  All of these expect their corresponding parameter to

  /// have a particular type.  None of this is currently enforced by

  /// clang.

  ///

  /// This should be kept in sync with ObjCDeclSpec::ObjCDeclQualifier.

  enum ObjCDeclQualifier {

    OBJC_TQ_None = 0x0,

    OBJC_TQ_In = 0x1,

    OBJC_TQ_Inout = 0x2,

    OBJC_TQ_Out = 0x4,

    OBJC_TQ_Bycopy = 0x8,

    OBJC_TQ_Byref = 0x10,

    OBJC_TQ_Oneway = 0x20,

 

    /// The nullability qualifier is set when the nullability of the

    /// result or parameter was expressed via a context-sensitive

    /// keyword.

    OBJC_TQ_CSNullability = 0x40

  };

 

  /// The kind of ownership a declaration has, for visibility purposes.

  /// This enumeration is designed such that higher values represent higher

  /// levels of name hiding.

  enum class ModuleOwnershipKind : unsigned {

    /// This declaration is not owned by a module.

    Unowned,

 

    /// This declaration has an owning module, but is globally visible

    /// (typically because its owning module is visible and we know that

    /// modules cannot later become hidden in this compilation).

    /// After serialization and deserialization, this will be converted

    /// to VisibleWhenImported.

    Visible,

 

    /// This declaration has an owning module, and is visible when that

    /// module is imported.

    VisibleWhenImported,

 

    /// This declaration has an owning module, and is visible to lookups

    /// that occurs within that module. And it is reachable in other module

    /// when the owning module is transitively imported.

    ReachableWhenImported,

 

    /// This declaration has an owning module, but is only visible to

    /// lookups that occur within that module.

    /// The discarded declarations in global module fragment belongs

    /// to this group too.

    ModulePrivate

  };

 

  /// The next declaration within the same lexical

  /// DeclContext. These pointers form the linked list that is

  /// traversed via DeclContext's decls_begin()/decls_end().

  ///

  /// The extra three bits are used for the ModuleOwnershipKind.

  llvm::PointerIntPair<Decl *, 3, ModuleOwnershipKind> NextInContextAndBits;

 

  friend class DeclContext;

 

  struct MultipleDC {

    DeclContext *SemanticDC;

    DeclContext *LexicalDC;

  };

 

  /// DeclCtx - Holds either a DeclContext* or a MultipleDC*.

  /// For declarations that don't contain C++ scope specifiers, it contains

  /// the DeclContext where the Decl was declared.

  /// For declarations with C++ scope specifiers, it contains a MultipleDC*

  /// with the context where it semantically belongs (SemanticDC) and the

  /// context where it was lexically declared (LexicalDC).

  /// e.g.:

  ///

  ///   namespace A {

  ///      void f(); // SemanticDC == LexicalDC == 'namespace A'

  ///   }

  ///   void A::f(); // SemanticDC == namespace 'A'

  ///                // LexicalDC == global namespace

  llvm::PointerUnion<DeclContext*, MultipleDC*> DeclCtx;

 

  bool isInSemaDC() const { return DeclCtx.is<DeclContext*>(); }

  bool isOutOfSemaDC() const { return DeclCtx.is<MultipleDC*>(); }

 

  MultipleDC *getMultipleDC() const {

    return DeclCtx.get<MultipleDC*>();

  }

 

  DeclContext *getSemanticDC() const {

    return DeclCtx.get<DeclContext*>();

  }

 

  /// Loc - The location of this decl.

  SourceLocation Loc;

 

  /// DeclKind - This indicates which class this is.

  unsigned DeclKind : 7;

 

  /// InvalidDecl - This indicates a semantic error occurred.

  unsigned InvalidDecl :  1;

 

  /// HasAttrs - This indicates whether the decl has attributes or not.

  unsigned HasAttrs : 1;

 

  /// Implicit - Whether this declaration was implicitly generated by

  /// the implementation rather than explicitly written by the user.

  unsigned Implicit : 1;

 

  /// Whether this declaration was "used", meaning that a definition is

  /// required.

  unsigned Used : 1;

 

  /// Whether this declaration was "referenced".

  /// The difference with 'Used' is whether the reference appears in a

  /// evaluated context or not, e.g. functions used in uninstantiated templates

  /// are regarded as "referenced" but not "used".

  unsigned Referenced : 1;

 

  /// Whether this declaration is a top-level declaration (function,

  /// global variable, etc.) that is lexically inside an objc container

  /// definition.

  unsigned TopLevelDeclInObjCContainer : 1;

 

  /// Whether statistic collection is enabled.

  static bool StatisticsEnabled;

 

  friend class ASTDeclReader;

  friend class ASTDeclWriter;

  friend class ASTNodeImporter;

  friend class ASTReader;

  friend class CXXClassMemberWrapper;

  friend class LinkageComputer;

  friend class RecordDecl;

  template<typename decl_type> friend class Redeclarable;

 

  /// Access - Used by C++ decls for the access specifier.

  // NOTE: VC++ treats enums as signed, avoid using the AccessSpecifier enum

  unsigned Access : 2;

 

  /// Whether this declaration was loaded from an AST file.

  unsigned FromASTFile : 1;

 

  /// IdentifierNamespace - This specifies what IDNS_* namespace this lives in.

  unsigned IdentifierNamespace : 14;

 

  /// If 0, we have not computed the linkage of this declaration.

  /// Otherwise, it is the linkage + 1.

  mutable unsigned CacheValidAndLinkage : 3;

 

  /// Allocate memory for a deserialized declaration.

  ///

  /// This routine must be used to allocate memory for any declaration that is

  /// deserialized from a module file.

  ///

  /// \param Size The size of the allocated object.

  /// \param Ctx The context in which we will allocate memory.

  /// \param ID The global ID of the deserialized declaration.

  /// \param Extra The amount of extra space to allocate after the object.

  void *operator new(std::size_t Size, const ASTContext &Ctx, unsigned ID,

                     std::size_t Extra = 0);

 

  /// Allocate memory for a non-deserialized declaration.

  void *operator new(std::size_t Size, const ASTContext &Ctx,

                     DeclContext *Parent, std::size_t Extra = 0);

 

  bool AccessDeclContextCheck() const;

 

  /// Get the module ownership kind to use for a local lexical child of \p DC,

  /// which may be either a local or (rarely) an imported declaration.

  static ModuleOwnershipKind getModuleOwnershipKindForChildOf(DeclContext *DC) {

    if (DC) {

      auto *D = cast<Decl>(DC);

      auto MOK = D->getModuleOwnershipKind();

      if (MOK != ModuleOwnershipKind::Unowned &&

          (!D->isFromASTFile() || D->hasLocalOwningModuleStorage()))

        return MOK;

      // If D is not local and we have no local module storage, then we don't

      // need to track module ownership at all.

    }

    return ModuleOwnershipKind::Unowned;

  }

 

  Decl() = delete;

  Decl(const Decl&) = delete;

  Decl(Decl &&) = delete;

  Decl &operator=(const Decl&) = delete;

  Decl &operator=(Decl&&) = delete;

 

  Decl(Kind DK, DeclContext *DC, SourceLocation L)

      : NextInContextAndBits(nullptr, getModuleOwnershipKindForChildOf(DC)),

        DeclCtx(DC), Loc(L), DeclKind(DK), InvalidDecl(false), HasAttrs(false),

        Implicit(false), Used(false), Referenced(false),

        TopLevelDeclInObjCContainer(false), Access(AS_none), FromASTFile(0),

        IdentifierNamespace(getIdentifierNamespaceForKind(DK)),

        CacheValidAndLinkage(0) {

    if (StatisticsEnabled) add(DK);

  }

 

  Decl(Kind DK, EmptyShell Empty)

      : DeclKind(DK), InvalidDecl(false), HasAttrs(false), Implicit(false),

        Used(false), Referenced(false), TopLevelDeclInObjCContainer(false),

        Access(AS_none), FromASTFile(0),

        IdentifierNamespace(getIdentifierNamespaceForKind(DK)),

        CacheValidAndLinkage(0) {

    if (StatisticsEnabled) add(DK);

  }

 

  virtual ~Decl();

 

  /// Update a potentially out-of-date declaration.

  void updateOutOfDate(IdentifierInfo &II) const;

 

  Linkage getCachedLinkage() const {

    return Linkage(CacheValidAndLinkage - 1);

  }

 

  void setCachedLinkage(Linkage L) const {

    CacheValidAndLinkage = L + 1;

  }

 

  bool hasCachedLinkage() const {

    return CacheValidAndLinkage;

  }

 

  /// Source range that this declaration covers.

  virtual SourceRange getSourceRange() const LLVM_READONLY {

    return SourceRange(getLocation(), getLocation());

  }

 

  SourceLocation getBeginLoc() const LLVM_READONLY {

    return getSourceRange().getBegin();

  }

 

  SourceLocation getEndLoc() const LLVM_READONLY {

    return getSourceRange().getEnd();

  }

 

  SourceLocation getLocation() const { return Loc; }

  void setLocation(SourceLocation L) { Loc = L; }

 

  Kind getKind() const { return static_cast<Kind>(DeclKind); }

  const char *getDeclKindName() const;

 

  Decl *getNextDeclInContext() { return NextInContextAndBits.getPointer(); }

  const Decl *getNextDeclInContext() const {return NextInContextAndBits.getPointer();}

 

  DeclContext *getDeclContext() {

    if (isInSemaDC())

      return getSemanticDC();

    return getMultipleDC()->SemanticDC;

  }

  const DeclContext *getDeclContext() const {

    return const_cast<Decl*>(this)->getDeclContext();

  }

 

  /// Return the non transparent context.

  /// See the comment of `DeclContext::isTransparentContext()` for the

  /// definition of transparent context.

  DeclContext *getNonTransparentDeclContext();

  const DeclContext *getNonTransparentDeclContext() const {

    return const_cast<Decl *>(this)->getNonTransparentDeclContext();

  }

 

  /// Find the innermost non-closure ancestor of this declaration,

  /// walking up through blocks, lambdas, etc.  If that ancestor is

  /// not a code context (!isFunctionOrMethod()), returns null.

  ///

  /// A declaration may be its own non-closure context.

  Decl *getNonClosureContext();

  const Decl *getNonClosureContext() const {

    return const_cast<Decl*>(this)->getNonClosureContext();

  }

 

  TranslationUnitDecl *getTranslationUnitDecl();

  const TranslationUnitDecl *getTranslationUnitDecl() const {

    return const_cast<Decl*>(this)->getTranslationUnitDecl();

  }

 

  bool isInAnonymousNamespace() const;

 

  bool isInStdNamespace() const;

 

  // Return true if this is a FileContext Decl.

  bool isFileContextDecl() const;

 

  ASTContext &getASTContext() const LLVM_READONLY;

 

  /// Helper to get the language options from the ASTContext.

  /// Defined out of line to avoid depending on ASTContext.h.

  const LangOptions &getLangOpts() const LLVM_READONLY;

 

  void setAccess(AccessSpecifier AS) {

    Access = AS;

    assert(AccessDeclContextCheck());

  }

 

  AccessSpecifier getAccess() const {

    assert(AccessDeclContextCheck());

    return AccessSpecifier(Access);

  }

 

  /// Retrieve the access specifier for this declaration, even though

  /// it may not yet have been properly set.

  AccessSpecifier getAccessUnsafe() const {

    return AccessSpecifier(Access);

  }

 

  bool hasAttrs() const { return HasAttrs; }

 

  void setAttrs(const AttrVec& Attrs) {

    return setAttrsImpl(Attrs, getASTContext());

  }

 

  AttrVec &getAttrs() {

    return const_cast<AttrVec&>(const_cast<const Decl*>(this)->getAttrs());

  }

 

  const AttrVec &getAttrs() const;

  void dropAttrs();

  void addAttr(Attr *A);

 

  using attr_iterator = AttrVec::const_iterator;

  using attr_range = llvm::iterator_range<attr_iterator>;

 

  attr_range attrs() const {

    return attr_range(attr_begin(), attr_end());

  }

 

  attr_iterator attr_begin() const {

    return hasAttrs() ? getAttrs().begin() : nullptr;

  }

  attr_iterator attr_end() const {

    return hasAttrs() ? getAttrs().end() : nullptr;

  }

 

  template <typename T>

  void dropAttr() {

    if (!HasAttrs) return;

 

    AttrVec &Vec = getAttrs();

    llvm::erase_if(Vec, [](Attr *A) { return isa<T>(A); });

 

    if (Vec.empty())

      HasAttrs = false;

  }

 

  template <typename T>

  llvm::iterator_range<specific_attr_iterator<T>> specific_attrs() const {

    return llvm::make_range(specific_attr_begin<T>(), specific_attr_end<T>());

  }

 

  template <typename T>

  specific_attr_iterator<T> specific_attr_begin() const {

    return specific_attr_iterator<T>(attr_begin());

  }

 

  template <typename T>

  specific_attr_iterator<T> specific_attr_end() const {

    return specific_attr_iterator<T>(attr_end());

  }

 

  template<typename T> T *getAttr() const {

    return hasAttrs() ? getSpecificAttr<T>(getAttrs()) : nullptr;

  }

 

  template<typename T> bool hasAttr() const {

    return hasAttrs() && hasSpecificAttr<T>(getAttrs());

  }

 

  /// getMaxAlignment - return the maximum alignment specified by attributes

  /// on this decl, 0 if there are none.

  unsigned getMaxAlignment() const;

 

  /// setInvalidDecl - Indicates the Decl had a semantic error. This

  /// allows for graceful error recovery.

  void setInvalidDecl(bool Invalid = true);

  bool isInvalidDecl() const { return (bool) InvalidDecl; }

 

  /// isImplicit - Indicates whether the declaration was implicitly

  /// generated by the implementation. If false, this declaration

  /// was written explicitly in the source code.

  bool isImplicit() const { return Implicit; }

  void setImplicit(bool I = true) { Implicit = I; }

 

  /// Whether *any* (re-)declaration of the entity was used, meaning that

  /// a definition is required.

  ///

  /// \param CheckUsedAttr When true, also consider the "used" attribute

  /// (in addition to the "used" bit set by \c setUsed()) when determining

  /// whether the function is used.

  bool isUsed(bool CheckUsedAttr = true) const;

 

  /// Set whether the declaration is used, in the sense of odr-use.

  ///

  /// This should only be used immediately after creating a declaration.

  /// It intentionally doesn't notify any listeners.

  void setIsUsed() { getCanonicalDecl()->Used = true; }

 

  /// Mark the declaration used, in the sense of odr-use.

  ///

  /// This notifies any mutation listeners in addition to setting a bit

  /// indicating the declaration is used.

  void markUsed(ASTContext &C);

 

  /// Whether any declaration of this entity was referenced.

  bool isReferenced() const;

 

  /// Whether this declaration was referenced. This should not be relied

  /// upon for anything other than debugging.

  bool isThisDeclarationReferenced() const { return Referenced; }

 

  void setReferenced(bool R = true) { Referenced = R; }

 

  /// Whether this declaration is a top-level declaration (function,

  /// global variable, etc.) that is lexically inside an objc container

  /// definition.

  bool isTopLevelDeclInObjCContainer() const {

    return TopLevelDeclInObjCContainer;

  }

 

  void setTopLevelDeclInObjCContainer(bool V = true) {

    TopLevelDeclInObjCContainer = V;

  }

 

  /// Looks on this and related declarations for an applicable

  /// external source symbol attribute.

  ExternalSourceSymbolAttr *getExternalSourceSymbolAttr() const;

 

  /// Whether this declaration was marked as being private to the

  /// module in which it was defined.

  bool isModulePrivate() const {

    return getModuleOwnershipKind() == ModuleOwnershipKind::ModulePrivate;

  }

 

  /// Whether this declaration was exported in a lexical context.

  /// e.g.:

  ///

  ///   export namespace A {

  ///      void f1();        // isInExportDeclContext() == true

  ///   }

  ///   void A::f1();        // isInExportDeclContext() == false

  ///

  ///   namespace B {

  ///      void f2();        // isInExportDeclContext() == false

  ///   }

  ///   export void B::f2(); // isInExportDeclContext() == true

  bool isInExportDeclContext() const;

 

  bool isInvisibleOutsideTheOwningModule() const {

    return getModuleOwnershipKind() > ModuleOwnershipKind::VisibleWhenImported;

  }

 

  /// FIXME: Implement discarding declarations actually in global module

  /// fragment. See [module.global.frag]p3,4 for details.

  bool isDiscardedInGlobalModuleFragment() const { return false; }

 

  /// Return true if this declaration has an attribute which acts as

  /// definition of the entity, such as 'alias' or 'ifunc'.

  bool hasDefiningAttr() const;

 

  /// Return this declaration's defining attribute if it has one.

  const Attr *getDefiningAttr() const;

 

  /// Specify that this declaration was marked as being private

  /// to the module in which it was defined.

  void setModulePrivate() {

    // The module-private specifier has no effect on unowned declarations.

    // FIXME: We should track this in some way for source fidelity.

    if (getModuleOwnershipKind() == ModuleOwnershipKind::Unowned)

      return;

    setModuleOwnershipKind(ModuleOwnershipKind::ModulePrivate);

  }

 

  /// Set the FromASTFile flag. This indicates that this declaration

  /// was deserialized and not parsed from source code and enables

  /// features such as module ownership information.

  void setFromASTFile() {

    FromASTFile = true;

  }

 

  /// Set the owning module ID.  This may only be called for

  /// deserialized Decls.

  void setOwningModuleID(unsigned ID) {

    assert(isFromASTFile() && "Only works on a deserialized declaration");

    *((unsigned*)this - 2) = ID;

  }

 

  /// Determine the availability of the given declaration.

  ///

  /// This routine will determine the most restrictive availability of

  /// the given declaration (e.g., preferring 'unavailable' to

  /// 'deprecated').

  ///

  /// \param Message If non-NULL and the result is not \c

  /// AR_Available, will be set to a (possibly empty) message

  /// describing why the declaration has not been introduced, is

  /// deprecated, or is unavailable.

  ///

  /// \param EnclosingVersion The version to compare with. If empty, assume the

  /// deployment target version.

  ///

  /// \param RealizedPlatform If non-NULL and the availability result is found

  /// in an available attribute it will set to the platform which is written in

  /// the available attribute.

  AvailabilityResult

  getAvailability(std::string *Message = nullptr,

                  VersionTuple EnclosingVersion = VersionTuple(),

                  StringRef *RealizedPlatform = nullptr) const;

 

  /// Retrieve the version of the target platform in which this

  /// declaration was introduced.

  ///

  /// \returns An empty version tuple if this declaration has no 'introduced'

  /// availability attributes, or the version tuple that's specified in the

  /// attribute otherwise.

  VersionTuple getVersionIntroduced() const;

 

  /// Determine whether this declaration is marked 'deprecated'.

  ///

  /// \param Message If non-NULL and the declaration is deprecated,

  /// this will be set to the message describing why the declaration

  /// was deprecated (which may be empty).

  bool isDeprecated(std::string *Message = nullptr) const {

    return getAvailability(Message) == AR_Deprecated;

  }

 

  /// Determine whether this declaration is marked 'unavailable'.

  ///

  /// \param Message If non-NULL and the declaration is unavailable,

  /// this will be set to the message describing why the declaration

  /// was made unavailable (which may be empty).

  bool isUnavailable(std::string *Message = nullptr) const {

    return getAvailability(Message) == AR_Unavailable;

  }

 

  /// Determine whether this is a weak-imported symbol.

  ///

  /// Weak-imported symbols are typically marked with the

  /// 'weak_import' attribute, but may also be marked with an

  /// 'availability' attribute where we're targing a platform prior to

  /// the introduction of this feature.

  bool isWeakImported() const;

 

  /// Determines whether this symbol can be weak-imported,

  /// e.g., whether it would be well-formed to add the weak_import

  /// attribute.

  ///

  /// \param IsDefinition Set to \c true to indicate that this

  /// declaration cannot be weak-imported because it has a definition.

  bool canBeWeakImported(bool &IsDefinition) const;

 

  /// Determine whether this declaration came from an AST file (such as

  /// a precompiled header or module) rather than having been parsed.

  bool isFromASTFile() const { return FromASTFile; }

 

  /// Retrieve the global declaration ID associated with this

  /// declaration, which specifies where this Decl was loaded from.

  unsigned getGlobalID() const {

    if (isFromASTFile())

      return *((const unsigned*)this - 1);

    return 0;

  }

 

  /// Retrieve the global ID of the module that owns this particular

  /// declaration.

  unsigned getOwningModuleID() const {

    if (isFromASTFile())

      return *((const unsigned*)this - 2);

    return 0;

  }

 

  Module *getOwningModuleSlow() const;

 

  bool hasLocalOwningModuleStorage() const;

 

  /// Get the imported owning module, if this decl is from an imported

  /// (non-local) module.

  Module *getImportedOwningModule() const {

    if (!isFromASTFile() || !hasOwningModule())

      return nullptr;

 

    return getOwningModuleSlow();

  }

 

  /// Get the local owning module, if known. Returns nullptr if owner is

  /// not yet known or declaration is not from a module.

  Module *getLocalOwningModule() const {

    if (isFromASTFile() || !hasOwningModule())

      return nullptr;

 

    assert(hasLocalOwningModuleStorage() &&

           "owned local decl but no local module storage");

    return reinterpret_cast<Module *const *>(this)[-1];

  }

  void setLocalOwningModule(Module *M) {

    assert(!isFromASTFile() && hasOwningModule() &&

           hasLocalOwningModuleStorage() &&

           "should not have a cached owning module");

    reinterpret_cast<Module **>(this)[-1] = M;

  }

 

  /// Is this declaration owned by some module?

  bool hasOwningModule() const {

    return getModuleOwnershipKind() != ModuleOwnershipKind::Unowned;

  }

 

  /// Get the module that owns this declaration (for visibility purposes).

  Module *getOwningModule() const {

    return isFromASTFile() ? getImportedOwningModule() : getLocalOwningModule();

  }

 

  /// Get the module that owns this declaration for linkage purposes.

  /// There only ever is such a module under the C++ Modules TS.

  ///

  /// \param IgnoreLinkage Ignore the linkage of the entity; assume that

  /// all declarations in a global module fragment are unowned.

  Module *getOwningModuleForLinkage(bool IgnoreLinkage = false) const;

 

  /// Determine whether this declaration is definitely visible to name lookup,

  /// independent of whether the owning module is visible.

  /// Note: The declaration may be visible even if this returns \c false if the

  /// owning module is visible within the query context. This is a low-level

  /// helper function; most code should be calling Sema::isVisible() instead.

  bool isUnconditionallyVisible() const {

    return (int)getModuleOwnershipKind() <= (int)ModuleOwnershipKind::Visible;

  }

 

  bool isReachable() const {

    return (int)getModuleOwnershipKind() <=

           (int)ModuleOwnershipKind::ReachableWhenImported;

  }

 

  /// Set that this declaration is globally visible, even if it came from a

  /// module that is not visible.

  void setVisibleDespiteOwningModule() {

    if (!isUnconditionallyVisible())

      setModuleOwnershipKind(ModuleOwnershipKind::Visible);

  }

 

  /// Get the kind of module ownership for this declaration.

  ModuleOwnershipKind getModuleOwnershipKind() const {

    return NextInContextAndBits.getInt();

  }

 

  /// Set whether this declaration is hidden from name lookup.

  void setModuleOwnershipKind(ModuleOwnershipKind MOK) {

    assert(!(getModuleOwnershipKind() == ModuleOwnershipKind::Unowned &&

             MOK != ModuleOwnershipKind::Unowned && !isFromASTFile() &&

             !hasLocalOwningModuleStorage()) &&

           "no storage available for owning module for this declaration");

    NextInContextAndBits.setInt(MOK);

  }

 

  unsigned getIdentifierNamespace() const {

    return IdentifierNamespace;

  }

 

  bool isInIdentifierNamespace(unsigned NS) const {

    return getIdentifierNamespace() & NS;

  }

 

  static unsigned getIdentifierNamespaceForKind(Kind DK);

 

  bool hasTagIdentifierNamespace() const {

    return isTagIdentifierNamespace(getIdentifierNamespace());

  }

 

  static bool isTagIdentifierNamespace(unsigned NS) {

    // TagDecls have Tag and Type set and may also have TagFriend.

    return (NS & ~IDNS_TagFriend) == (IDNS_Tag | IDNS_Type);

  }

 

  /// getLexicalDeclContext - The declaration context where this Decl was

  /// lexically declared (LexicalDC). May be different from

  /// getDeclContext() (SemanticDC).

  /// e.g.:

  ///

  ///   namespace A {

  ///      void f(); // SemanticDC == LexicalDC == 'namespace A'

  ///   }

  ///   void A::f(); // SemanticDC == namespace 'A'

  ///                // LexicalDC == global namespace

  DeclContext *getLexicalDeclContext() {

    if (isInSemaDC())

      return getSemanticDC();

    return getMultipleDC()->LexicalDC;

  }

  const DeclContext *getLexicalDeclContext() const {

    return const_cast<Decl*>(this)->getLexicalDeclContext();

  }

 

  /// Determine whether this declaration is declared out of line (outside its

  /// semantic context).

  virtual bool isOutOfLine() const;

 

  /// setDeclContext - Set both the semantic and lexical DeclContext

  /// to DC.

  void setDeclContext(DeclContext *DC);

 

  void setLexicalDeclContext(DeclContext *DC);

 

  /// Determine whether this declaration is a templated entity (whether it is

  // within the scope of a template parameter).

  bool isTemplated() const;

 

  /// Determine the number of levels of template parameter surrounding this

  /// declaration.

  unsigned getTemplateDepth() const;

 

  /// isDefinedOutsideFunctionOrMethod - This predicate returns true if this

  /// scoped decl is defined outside the current function or method.  This is

  /// roughly global variables and functions, but also handles enums (which

  /// could be defined inside or outside a function etc).

  bool isDefinedOutsideFunctionOrMethod() const {

    return getParentFunctionOrMethod() == nullptr;

  }

 

  /// Determine whether a substitution into this declaration would occur as

  /// part of a substitution into a dependent local scope. Such a substitution

  /// transitively substitutes into all constructs nested within this

  /// declaration.

  ///

  /// This recognizes non-defining declarations as well as members of local

  /// classes and lambdas:

  /// \code

  ///     template<typename T> void foo() { void bar(); }

  ///     template<typename T> void foo2() { class ABC { void bar(); }; }

  ///     template<typename T> inline int x = [](){ return 0; }();

  /// \endcode

  bool isInLocalScopeForInstantiation() const;

 

  /// If this decl is defined inside a function/method/block it returns

  /// the corresponding DeclContext, otherwise it returns null.

  const DeclContext *

  getParentFunctionOrMethod(bool LexicalParent = false) const;

  DeclContext *getParentFunctionOrMethod(bool LexicalParent = false) {

    return const_cast<DeclContext *>(

        const_cast<const Decl *>(this)->getParentFunctionOrMethod(

            LexicalParent));

  }

 

  /// Retrieves the "canonical" declaration of the given declaration.

  virtual Decl *getCanonicalDecl() { return this; }

  const Decl *getCanonicalDecl() const {

    return const_cast<Decl*>(this)->getCanonicalDecl();

  }

 

  /// Whether this particular Decl is a canonical one.

  bool isCanonicalDecl() const { return getCanonicalDecl() == this; }

 

  /// Returns the next redeclaration or itself if this is the only decl.

  ///

  /// Decl subclasses that can be redeclared should override this method so that

  /// Decl::redecl_iterator can iterate over them.

  virtual Decl *getNextRedeclarationImpl() { return this; }

 

  /// Implementation of getPreviousDecl(), to be overridden by any

  /// subclass that has a redeclaration chain.

  virtual Decl *getPreviousDeclImpl() { return nullptr; }

 

  /// Implementation of getMostRecentDecl(), to be overridden by any

  /// subclass that has a redeclaration chain.

  virtual Decl *getMostRecentDeclImpl() { return this; }

 

  /// Iterates through all the redeclarations of the same decl.

  class redecl_iterator {

    /// Current - The current declaration.

    Decl *Current = nullptr;

    Decl *Starter;

 

  public:

    using value_type = Decl *;

    using reference = const value_type &;

    using pointer = const value_type *;

    using iterator_category = std::forward_iterator_tag;

    using difference_type = std::ptrdiff_t;

 

    redecl_iterator() = default;

    explicit redecl_iterator(Decl *C) : Current(C), Starter(C) {}

 

    reference operator*() const { return Current; }

    value_type operator->() const { return Current; }

 

    redecl_iterator& operator++() {

      assert(Current && "Advancing while iterator has reached end");

      // Get either previous decl or latest decl.

      Decl *Next = Current->getNextRedeclarationImpl();

      assert(Next && "Should return next redeclaration or itself, never null!");

      Current = (Next != Starter) ? Next : nullptr;

      return *this;

    }

 

    redecl_iterator operator++(int) {

      redecl_iterator tmp(*this);

      ++(*this);

      return tmp;

    }

 

    friend bool operator==(redecl_iterator x, redecl_iterator y) {

      return x.Current == y.Current;

    }

 

    friend bool operator!=(redecl_iterator x, redecl_iterator y) {

      return x.Current != y.Current;

    }

  };

 

  using redecl_range = llvm::iterator_range<redecl_iterator>;

 

  /// Returns an iterator range for all the redeclarations of the same

  /// decl. It will iterate at least once (when this decl is the only one).

  redecl_range redecls() const {

    return redecl_range(redecls_begin(), redecls_end());

  }

 

  redecl_iterator redecls_begin() const {

    return redecl_iterator(const_cast<Decl *>(this));

  }

 

  redecl_iterator redecls_end() const { return redecl_iterator(); }

 

  /// Retrieve the previous declaration that declares the same entity

  /// as this declaration, or NULL if there is no previous declaration.

  Decl *getPreviousDecl() { return getPreviousDeclImpl(); }

 

  /// Retrieve the previous declaration that declares the same entity

  /// as this declaration, or NULL if there is no previous declaration.

  const Decl *getPreviousDecl() const {

    return const_cast<Decl *>(this)->getPreviousDeclImpl();

  }

 

  /// True if this is the first declaration in its redeclaration chain.

  bool isFirstDecl() const {

    return getPreviousDecl() == nullptr;

  }

 

  /// Retrieve the most recent declaration that declares the same entity

  /// as this declaration (which may be this declaration).

  Decl *getMostRecentDecl() { return getMostRecentDeclImpl(); }

 

  /// Retrieve the most recent declaration that declares the same entity

  /// as this declaration (which may be this declaration).

  const Decl *getMostRecentDecl() const {

    return const_cast<Decl *>(this)->getMostRecentDeclImpl();

  }

 

  /// getBody - If this Decl represents a declaration for a body of code,

  ///  such as a function or method definition, this method returns the

  ///  top-level Stmt* of that body.  Otherwise this method returns null.

  virtual Stmt* getBody() const { return nullptr; }

 

  /// Returns true if this \c Decl represents a declaration for a body of

  /// code, such as a function or method definition.

  /// Note that \c hasBody can also return true if any redeclaration of this

  /// \c Decl represents a declaration for a body of code.

  virtual bool hasBody() const { return getBody() != nullptr; }

 

  /// getBodyRBrace - Gets the right brace of the body, if a body exists.

  /// This works whether the body is a CompoundStmt or a CXXTryStmt.

  SourceLocation getBodyRBrace() const;

 

  // global temp stats (until we have a per-module visitor)

  static void add(Kind k);

  static void EnableStatistics();

  static void PrintStats();

 

  /// isTemplateParameter - Determines whether this declaration is a

  /// template parameter.

  bool isTemplateParameter() const;

 

  /// isTemplateParameter - Determines whether this declaration is a

  /// template parameter pack.

  bool isTemplateParameterPack() const;

 

  /// Whether this declaration is a parameter pack.

  bool isParameterPack() const;

 

  /// returns true if this declaration is a template

  bool isTemplateDecl() const;

 

  /// Whether this declaration is a function or function template.

  bool isFunctionOrFunctionTemplate() const {

    return (DeclKind >= Decl::firstFunction &&

            DeclKind <= Decl::lastFunction) ||

           DeclKind == FunctionTemplate;

  }

 

  /// If this is a declaration that describes some template, this

  /// method returns that template declaration.

  ///

  /// Note that this returns nullptr for partial specializations, because they

  /// are not modeled as TemplateDecls. Use getDescribedTemplateParams to handle

  /// those cases.

  TemplateDecl *getDescribedTemplate() const;

 

  /// If this is a declaration that describes some template or partial

  /// specialization, this returns the corresponding template parameter list.

  const TemplateParameterList *getDescribedTemplateParams() const;

 

  /// Returns the function itself, or the templated function if this is a

  /// function template.

  FunctionDecl *getAsFunction() LLVM_READONLY;

 

  const FunctionDecl *getAsFunction() const {

    return const_cast<Decl *>(this)->getAsFunction();

  }

 

  /// Changes the namespace of this declaration to reflect that it's

  /// a function-local extern declaration.

  ///

  /// These declarations appear in the lexical context of the extern

  /// declaration, but in the semantic context of the enclosing namespace

  /// scope.

  void setLocalExternDecl() {

    Decl *Prev = getPreviousDecl();

    IdentifierNamespace &= ~IDNS_Ordinary;

 

    // It's OK for the declaration to still have the "invisible friend" flag or

    // the "conflicts with tag declarations in this scope" flag for the outer

    // scope.

    assert((IdentifierNamespace & ~(IDNS_OrdinaryFriend | IDNS_Tag)) == 0 &&

           "namespace is not ordinary");

 

    IdentifierNamespace |= IDNS_LocalExtern;

    if (Prev && Prev->getIdentifierNamespace() & IDNS_Ordinary)

      IdentifierNamespace |= IDNS_Ordinary;

  }

 

  /// Determine whether this is a block-scope declaration with linkage.

  /// This will either be a local variable declaration declared 'extern', or a

  /// local function declaration.

  bool isLocalExternDecl() const {

    return IdentifierNamespace & IDNS_LocalExtern;

  }

 

  /// Changes the namespace of this declaration to reflect that it's

  /// the object of a friend declaration.

  ///

  /// These declarations appear in the lexical context of the friending

  /// class, but in the semantic context of the actual entity.  This property

  /// applies only to a specific decl object;  other redeclarations of the

  /// same entity may not (and probably don't) share this property.

  void setObjectOfFriendDecl(bool PerformFriendInjection = false) {

    unsigned OldNS = IdentifierNamespace;

    assert((OldNS & (IDNS_Tag | IDNS_Ordinary |

                     IDNS_TagFriend | IDNS_OrdinaryFriend |

                     IDNS_LocalExtern | IDNS_NonMemberOperator)) &&

           "namespace includes neither ordinary nor tag");

    assert(!(OldNS & ~(IDNS_Tag | IDNS_Ordinary | IDNS_Type |

                       IDNS_TagFriend | IDNS_OrdinaryFriend |

                       IDNS_LocalExtern | IDNS_NonMemberOperator)) &&

           "namespace includes other than ordinary or tag");

 

    Decl *Prev = getPreviousDecl();

    IdentifierNamespace &= ~(IDNS_Ordinary | IDNS_Tag | IDNS_Type);

 

    if (OldNS & (IDNS_Tag | IDNS_TagFriend)) {

      IdentifierNamespace |= IDNS_TagFriend;

      if (PerformFriendInjection ||

          (Prev && Prev->getIdentifierNamespace() & IDNS_Tag))

        IdentifierNamespace |= IDNS_Tag | IDNS_Type;

    }

 

    if (OldNS & (IDNS_Ordinary | IDNS_OrdinaryFriend |

                 IDNS_LocalExtern | IDNS_NonMemberOperator)) {

      IdentifierNamespace |= IDNS_OrdinaryFriend;

      if (PerformFriendInjection ||

          (Prev && Prev->getIdentifierNamespace() & IDNS_Ordinary))

        IdentifierNamespace |= IDNS_Ordinary;

    }

  }

 

  enum FriendObjectKind {

    FOK_None,      ///< Not a friend object.

    FOK_Declared,  ///< A friend of a previously-declared entity.

    FOK_Undeclared ///< A friend of a previously-undeclared entity.

  };

 

  /// Determines whether this declaration is the object of a

  /// friend declaration and, if so, what kind.

  ///

  /// There is currently no direct way to find the associated FriendDecl.

  FriendObjectKind getFriendObjectKind() const {

    unsigned mask =

        (IdentifierNamespace & (IDNS_TagFriend | IDNS_OrdinaryFriend));

    if (!mask) return FOK_None;

    return (IdentifierNamespace & (IDNS_Tag | IDNS_Ordinary) ? FOK_Declared

                                                             : FOK_Undeclared);

  }

 

  /// Specifies that this declaration is a C++ overloaded non-member.

  void setNonMemberOperator() {

    assert(getKind() == Function || getKind() == FunctionTemplate);

    assert((IdentifierNamespace & IDNS_Ordinary) &&

           "visible non-member operators should be in ordinary namespace");

    IdentifierNamespace |= IDNS_NonMemberOperator;

  }

 

  static bool classofKind(Kind K) { return true; }

  static DeclContext *castToDeclContext(const Decl *);

  static Decl *castFromDeclContext(const DeclContext *);

 

  void print(raw_ostream &Out, unsigned Indentation = 0,

             bool PrintInstantiation = false) const;

  void print(raw_ostream &Out, const PrintingPolicy &Policy,

             unsigned Indentation = 0, bool PrintInstantiation = false) const;

  static void printGroup(Decl** Begin, unsigned NumDecls,

                         raw_ostream &Out, const PrintingPolicy &Policy,

                         unsigned Indentation = 0);

 

  // Debuggers don't usually respect default arguments.

  void dump() const;

 

  // Same as dump(), but forces color printing.

  void dumpColor() const;

 

  void dump(raw_ostream &Out, bool Deserialize = false,

            ASTDumpOutputFormat OutputFormat = ADOF_Default) const;

 

  /// \return Unique reproducible object identifier

  int64_t getID() const;

 

  /// Looks through the Decl's underlying type to extract a FunctionType

  /// when possible. Will return null if the type underlying the Decl does not

  /// have a FunctionType.

  const FunctionType *getFunctionType(bool BlocksToo = true) const;

 

  void setAttrsImpl(const AttrVec& Attrs, ASTContext &Ctx);

  void setDeclContextsImpl(DeclContext *SemaDC, DeclContext *LexicalDC,

                           ASTContext &Ctx);

 

  ASTMutationListener *getASTMutationListener() const;

 

inline bool declaresSameEntity(const Decl *D1, const Decl *D2) {

  if (!D1 || !D2)

    return false;

 

  if (D1 == D2)

    return true;

 

  return D1->getCanonicalDecl() == D2->getCanonicalDecl();

 

class PrettyStackTraceDecl : public llvm::PrettyStackTraceEntry {

  const Decl *TheDecl;

  SourceLocation Loc;

  SourceManager &SM;

  const char *Message;

 

  PrettyStackTraceDecl(const Decl *theDecl, SourceLocation L,

                       SourceManager &sm, const char *Msg)

      : TheDecl(theDecl), Loc(L), SM(sm), Message(Msg) {}

 

  void print(raw_ostream &OS) const override;

} // namespace clang

 

namespace llvm {

  template <> struct PointerLikeTypeTraits<::clang::NamedDecl *> {

    static inline void *getAsVoidPointer(::clang::NamedDecl *P) { return P; }

    static inline ::clang::NamedDecl *getFromVoidPointer(void *P) {

      return static_cast<::clang::NamedDecl *>(P);

    }

    static constexpr int NumLowBitsAvailable = 3;

  };

 

namespace clang {

class DeclListNode {

  friend class ASTContext; // allocate, deallocate nodes.

  friend class StoredDeclsList;

  using Decls = llvm::PointerUnion<NamedDecl*, DeclListNode*>;

  class iterator {

    friend class DeclContextLookupResult;

    friend class StoredDeclsList;

 

    Decls Ptr;

    iterator(Decls Node) : Ptr(Node) { }

  public:

    using difference_type = ptrdiff_t;

    using value_type = NamedDecl*;

    using pointer = void;

    using reference = value_type;

    using iterator_category = std::forward_iterator_tag;

 

    iterator() = default;

 

    reference operator*() const {

      assert(Ptr && "dereferencing end() iterator");

      if (DeclListNode *CurNode = Ptr.dyn_cast<DeclListNode*>())

        return CurNode->D;

      return Ptr.get<NamedDecl*>();

    }

    void operator->() const { } // Unsupported.

    bool operator==(const iterator &X) const { return Ptr == X.Ptr; }

    bool operator!=(const iterator &X) const { return Ptr != X.Ptr; }

    inline iterator &operator++() { // ++It

      assert(!Ptr.isNull() && "Advancing empty iterator");

 

      if (DeclListNode *CurNode = Ptr.dyn_cast<DeclListNode*>())

        Ptr = CurNode->Rest;

      else

        Ptr = nullptr;

      return *this;

    }

    iterator operator++(int) { // It++

      iterator temp = *this;

      ++(*this);

      return temp;

    }

    // Enables the pattern for (iterator I =..., E = I.end(); I != E; ++I)

    iterator end() { return iterator(); }

  };

  NamedDecl *D = nullptr;

  Decls Rest = nullptr;

  DeclListNode(NamedDecl *ND) : D(ND) {}

 

class DeclContextLookupResult {

  using Decls = DeclListNode::Decls;

 

  /// When in collection form, this is what the Data pointer points to.

  Decls Result;

 

  DeclContextLookupResult() = default;

  DeclContextLookupResult(Decls Result) : Result(Result) {}

 

  using iterator = DeclListNode::iterator;

  using const_iterator = iterator;

  using reference = iterator::reference;

 

  iterator begin() { return iterator(Result); }

  iterator end() { return iterator(); }

  const_iterator begin() const {

    return const_cast<DeclContextLookupResult*>(this)->begin();

  }

  const_iterator end() const { return iterator(); }

 

  bool empty() const { return Result.isNull();  }

  bool isSingleResult() const { return Result.dyn_cast<NamedDecl*>(); }

  reference front() const { return *begin(); }

 

  // Find the first declaration of the given type in the list. Note that this

  // is not in general the earliest-declared declaration, and should only be

  // used when it's not possible for there to be more than one match or where

  // it doesn't matter which one is found.

  template<class T> T *find_first() const {

    for (auto *D : *this)

      if (T *Decl = dyn_cast<T>(D))

        return Decl;

 

    return nullptr;

  }

 

class DeclContext {

  /// For makeDeclVisibleInContextImpl

  friend class ASTDeclReader;

  /// For reconcileExternalVisibleStorage, CreateStoredDeclsMap,

  /// hasNeedToReconcileExternalVisibleStorage

  friend class ExternalASTSource;

  /// For CreateStoredDeclsMap

  friend class DependentDiagnostic;

  /// For hasNeedToReconcileExternalVisibleStorage,

  /// hasLazyLocalLexicalLookups, hasLazyExternalLexicalLookups

  friend class ASTWriter;

 

  // We use uint64_t in the bit-fields below since some bit-fields

  // cross the unsigned boundary and this breaks the packing.

 

  /// Stores the bits used by DeclContext.

  /// If modified NumDeclContextBit, the ctor of DeclContext and the accessor

  /// methods in DeclContext should be updated appropriately.

  class DeclContextBitfields {

    friend class DeclContext;

    /// DeclKind - This indicates which class this is.

    uint64_t DeclKind : 7;

 

    /// Whether this declaration context also has some external

    /// storage that contains additional declarations that are lexically

    /// part of this context.

    mutable uint64_t ExternalLexicalStorage : 1;

 

    /// Whether this declaration context also has some external

    /// storage that contains additional declarations that are visible

    /// in this context.

    mutable uint64_t ExternalVisibleStorage : 1;

 

    /// Whether this declaration context has had externally visible

    /// storage added since the last lookup. In this case, \c LookupPtr's

    /// invariant may not hold and needs to be fixed before we perform

    /// another lookup.

    mutable uint64_t NeedToReconcileExternalVisibleStorage : 1;

 

    /// If \c true, this context may have local lexical declarations

    /// that are missing from the lookup table.

    mutable uint64_t HasLazyLocalLexicalLookups : 1;

 

    /// If \c true, the external source may have lexical declarations

    /// that are missing from the lookup table.

    mutable uint64_t HasLazyExternalLexicalLookups : 1;

 

    /// If \c true, lookups should only return identifier from

    /// DeclContext scope (for example TranslationUnit). Used in

    /// LookupQualifiedName()

    mutable uint64_t UseQualifiedLookup : 1;

  };

 

  /// Number of bits in DeclContextBitfields.

  enum { NumDeclContextBits = 13 };

 

  /// Stores the bits used by TagDecl.

  /// If modified NumTagDeclBits and the accessor

  /// methods in TagDecl should be updated appropriately.

  class TagDeclBitfields {

    friend class TagDecl;

    /// For the bits in DeclContextBitfields

    uint64_t : NumDeclContextBits;

 

    /// The TagKind enum.

    uint64_t TagDeclKind : 3;

 

    /// True if this is a definition ("struct foo {};"), false if it is a

    /// declaration ("struct foo;").  It is not considered a definition

    /// until the definition has been fully processed.

    uint64_t IsCompleteDefinition : 1;

 

    /// True if this is currently being defined.

    uint64_t IsBeingDefined : 1;

 

    /// True if this tag declaration is "embedded" (i.e., defined or declared

    /// for the very first time) in the syntax of a declarator.

    uint64_t IsEmbeddedInDeclarator : 1;

 

    /// True if this tag is free standing, e.g. "struct foo;".

    uint64_t IsFreeStanding : 1;

 

    /// Indicates whether it is possible for declarations of this kind

    /// to have an out-of-date definition.

    ///

    /// This option is only enabled when modules are enabled.

    uint64_t MayHaveOutOfDateDef : 1;

 

    /// Has the full definition of this type been required by a use somewhere in

    /// the TU.

    uint64_t IsCompleteDefinitionRequired : 1;

 

    /// Whether this tag is a definition which was demoted due to

    /// a module merge.

    uint64_t IsThisDeclarationADemotedDefinition : 1;

  };

 

  /// Number of non-inherited bits in TagDeclBitfields.

  enum { NumTagDeclBits = 10 };

 

  /// Stores the bits used by EnumDecl.

  /// If modified NumEnumDeclBit and the accessor

  /// methods in EnumDecl should be updated appropriately.

  class EnumDeclBitfields {

    friend class EnumDecl;

    /// For the bits in DeclContextBitfields.

    uint64_t : NumDeclContextBits;

    /// For the bits in TagDeclBitfields.

    uint64_t : NumTagDeclBits;

 

    /// Width in bits required to store all the non-negative

    /// enumerators of this enum.

    uint64_t NumPositiveBits : 8;

 

    /// Width in bits required to store all the negative

    /// enumerators of this enum.

    uint64_t NumNegativeBits : 8;

 

    /// True if this tag declaration is a scoped enumeration. Only

    /// possible in C++11 mode.

    uint64_t IsScoped : 1;

 

    /// If this tag declaration is a scoped enum,

    /// then this is true if the scoped enum was declared using the class

    /// tag, false if it was declared with the struct tag. No meaning is

    /// associated if this tag declaration is not a scoped enum.

    uint64_t IsScopedUsingClassTag : 1;

 

    /// True if this is an enumeration with fixed underlying type. Only

    /// possible in C++11, Microsoft extensions, or Objective C mode.

    uint64_t IsFixed : 1;

 

    /// True if a valid hash is stored in ODRHash.

    uint64_t HasODRHash : 1;

  };

 

  /// Number of non-inherited bits in EnumDeclBitfields.

  enum { NumEnumDeclBits = 20 };

 

  /// Stores the bits used by RecordDecl.

  /// If modified NumRecordDeclBits and the accessor

  /// methods in RecordDecl should be updated appropriately.

  class RecordDeclBitfields {

    friend class RecordDecl;

    /// For the bits in DeclContextBitfields.

    uint64_t : NumDeclContextBits;

    /// For the bits in TagDeclBitfields.

    uint64_t : NumTagDeclBits;

 

    /// This is true if this struct ends with a flexible

    /// array member (e.g. int X[]) or if this union contains a struct that does.

    /// If so, this cannot be contained in arrays or other structs as a member.

    uint64_t HasFlexibleArrayMember : 1;

 

    /// Whether this is the type of an anonymous struct or union.

    uint64_t AnonymousStructOrUnion : 1;

 

    /// This is true if this struct has at least one member

    /// containing an Objective-C object pointer type.

    uint64_t HasObjectMember : 1;

 

    /// This is true if struct has at least one member of

    /// 'volatile' type.

    uint64_t HasVolatileMember : 1;

 

    /// Whether the field declarations of this record have been loaded

    /// from external storage. To avoid unnecessary deserialization of

    /// methods/nested types we allow deserialization of just the fields

    /// when needed.

    mutable uint64_t LoadedFieldsFromExternalStorage : 1;

 

    /// Basic properties of non-trivial C structs.

    uint64_t NonTrivialToPrimitiveDefaultInitialize : 1;

    uint64_t NonTrivialToPrimitiveCopy : 1;

    uint64_t NonTrivialToPrimitiveDestroy : 1;

 

    /// The following bits indicate whether this is or contains a C union that

    /// is non-trivial to default-initialize, destruct, or copy. These bits

    /// imply the associated basic non-triviality predicates declared above.

    uint64_t HasNonTrivialToPrimitiveDefaultInitializeCUnion : 1;

    uint64_t HasNonTrivialToPrimitiveDestructCUnion : 1;

    uint64_t HasNonTrivialToPrimitiveCopyCUnion : 1;

 

    /// Indicates whether this struct is destroyed in the callee.

    uint64_t ParamDestroyedInCallee : 1;

 

    /// Represents the way this type is passed to a function.

    uint64_t ArgPassingRestrictions : 2;

 

    /// Indicates whether this struct has had its field layout randomized.

    uint64_t IsRandomized : 1;

 

    /// True if a valid hash is stored in ODRHash. This should shave off some

    /// extra storage and prevent CXXRecordDecl to store unused bits.

    uint64_t ODRHash : 26;

  };

 

  /// Number of non-inherited bits in RecordDeclBitfields.

  enum { NumRecordDeclBits = 41 };

 

  /// Stores the bits used by OMPDeclareReductionDecl.

  /// If modified NumOMPDeclareReductionDeclBits and the accessor

  /// methods in OMPDeclareReductionDecl should be updated appropriately.

  class OMPDeclareReductionDeclBitfields {

    friend class OMPDeclareReductionDecl;

    /// For the bits in DeclContextBitfields

    uint64_t : NumDeclContextBits;

 

    /// Kind of initializer,

    /// function call or omp_priv<init_expr> initializtion.

    uint64_t InitializerKind : 2;

  };

 

  /// Number of non-inherited bits in OMPDeclareReductionDeclBitfields.

  enum { NumOMPDeclareReductionDeclBits = 2 };

 

  /// Stores the bits used by FunctionDecl.

  /// If modified NumFunctionDeclBits and the accessor

  /// methods in FunctionDecl and CXXDeductionGuideDecl

  /// (for IsCopyDeductionCandidate) should be updated appropriately.

  class FunctionDeclBitfields {

    friend class FunctionDecl;

    /// For IsCopyDeductionCandidate

    friend class CXXDeductionGuideDecl;

    /// For the bits in DeclContextBitfields.

    uint64_t : NumDeclContextBits;

 

    uint64_t SClass : 3;

    uint64_t IsInline : 1;

    uint64_t IsInlineSpecified : 1;

 

    uint64_t IsVirtualAsWritten : 1;

    uint64_t IsPure : 1;

    uint64_t HasInheritedPrototype : 1;

    uint64_t HasWrittenPrototype : 1;

    uint64_t IsDeleted : 1;

    /// Used by CXXMethodDecl

    uint64_t IsTrivial : 1;

 

    /// This flag indicates whether this function is trivial for the purpose of

    /// calls. This is meaningful only when this function is a copy/move

    /// constructor or a destructor.

    uint64_t IsTrivialForCall : 1;

 

    uint64_t IsDefaulted : 1;

    uint64_t IsExplicitlyDefaulted : 1;

    uint64_t HasDefaultedFunctionInfo : 1;

 

    /// For member functions of complete types, whether this is an ineligible

    /// special member function or an unselected destructor. See

    /// [class.mem.special].

    uint64_t IsIneligibleOrNotSelected : 1;

 

    uint64_t HasImplicitReturnZero : 1;

    uint64_t IsLateTemplateParsed : 1;

 

    /// Kind of contexpr specifier as defined by ConstexprSpecKind.

    uint64_t ConstexprKind : 2;

    uint64_t InstantiationIsPending : 1;

 

    /// Indicates if the function uses __try.

    uint64_t UsesSEHTry : 1;

 

    /// Indicates if the function was a definition

    /// but its body was skipped.

    uint64_t HasSkippedBody : 1;

 

    /// Indicates if the function declaration will

    /// have a body, once we're done parsing it.

    uint64_t WillHaveBody : 1;

 

    /// Indicates that this function is a multiversioned

    /// function using attribute 'target'.

    uint64_t IsMultiVersion : 1;

 

    /// [C++17] Only used by CXXDeductionGuideDecl. Indicates that

    /// the Deduction Guide is the implicitly generated 'copy

    /// deduction candidate' (is used during overload resolution).

    uint64_t IsCopyDeductionCandidate : 1;

 

    /// Store the ODRHash after first calculation.

    uint64_t HasODRHash : 1;

 

    /// Indicates if the function uses Floating Point Constrained Intrinsics

    uint64_t UsesFPIntrin : 1;

 

    // Indicates this function is a constrained friend, where the constraint

    // refers to an enclosing template for hte purposes of [temp.friend]p9.

    uint64_t FriendConstraintRefersToEnclosingTemplate : 1;

  };

 

  /// Number of non-inherited bits in FunctionDeclBitfields.

  enum { NumFunctionDeclBits = 29 };

 

  /// Stores the bits used by CXXConstructorDecl. If modified

  /// NumCXXConstructorDeclBits and the accessor

  /// methods in CXXConstructorDecl should be updated appropriately.

  class CXXConstructorDeclBitfields {

    friend class CXXConstructorDecl;

    /// For the bits in DeclContextBitfields.

    uint64_t : NumDeclContextBits;

    /// For the bits in FunctionDeclBitfields.

    uint64_t : NumFunctionDeclBits;

 

    /// 22 bits to fit in the remaining available space.

    /// Note that this makes CXXConstructorDeclBitfields take

    /// exactly 64 bits and thus the width of NumCtorInitializers

    /// will need to be shrunk if some bit is added to NumDeclContextBitfields,

    /// NumFunctionDeclBitfields or CXXConstructorDeclBitfields.

    uint64_t NumCtorInitializers : 19;

    uint64_t IsInheritingConstructor : 1;

 

    /// Whether this constructor has a trail-allocated explicit specifier.

    uint64_t HasTrailingExplicitSpecifier : 1;

    /// If this constructor does't have a trail-allocated explicit specifier.

    /// Whether this constructor is explicit specified.

    uint64_t IsSimpleExplicit : 1;

  };

 

  /// Number of non-inherited bits in CXXConstructorDeclBitfields.

  enum {

    NumCXXConstructorDeclBits = 64 - NumDeclContextBits - NumFunctionDeclBits

  };

 

  /// Stores the bits used by ObjCMethodDecl.

  /// If modified NumObjCMethodDeclBits and the accessor

  /// methods in ObjCMethodDecl should be updated appropriately.

  class ObjCMethodDeclBitfields {

    friend class ObjCMethodDecl;

 

    /// For the bits in DeclContextBitfields.

    uint64_t : NumDeclContextBits;

 

    /// The conventional meaning of this method; an ObjCMethodFamily.

    /// This is not serialized; instead, it is computed on demand and

    /// cached.

    mutable uint64_t Family : ObjCMethodFamilyBitWidth;

 

    /// instance (true) or class (false) method.

    uint64_t IsInstance : 1;

    uint64_t IsVariadic : 1;

 

    /// True if this method is the getter or setter for an explicit property.

    uint64_t IsPropertyAccessor : 1;

 

    /// True if this method is a synthesized property accessor stub.

    uint64_t IsSynthesizedAccessorStub : 1;

 

    /// Method has a definition.

    uint64_t IsDefined : 1;

 

    /// Method redeclaration in the same interface.

    uint64_t IsRedeclaration : 1;

 

    /// Is redeclared in the same interface.

    mutable uint64_t HasRedeclaration : 1;

 

    /// \@required/\@optional

    uint64_t DeclImplementation : 2;

 

    /// in, inout, etc.

    uint64_t objcDeclQualifier : 7;

 

    /// Indicates whether this method has a related result type.

    uint64_t RelatedResultType : 1;

 

    /// Whether the locations of the selector identifiers are in a

    /// "standard" position, a enum SelectorLocationsKind.

    uint64_t SelLocsKind : 2;

 

    /// Whether this method overrides any other in the class hierarchy.

    ///

    /// A method is said to override any method in the class's

    /// base classes, its protocols, or its categories' protocols, that has

    /// the same selector and is of the same kind (class or instance).

    /// A method in an implementation is not considered as overriding the same

    /// method in the interface or its categories.

    uint64_t IsOverriding : 1;

 

    /// Indicates if the method was a definition but its body was skipped.

    uint64_t HasSkippedBody : 1;

  };

 

  /// Number of non-inherited bits in ObjCMethodDeclBitfields.

  enum { NumObjCMethodDeclBits = 24 };

 

  /// Stores the bits used by ObjCContainerDecl.

  /// If modified NumObjCContainerDeclBits and the accessor

  /// methods in ObjCContainerDecl should be updated appropriately.

  class ObjCContainerDeclBitfields {

    friend class ObjCContainerDecl;

    /// For the bits in DeclContextBitfields