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 //===- ASTBitCodes.h - Enum values for the PCH bitcode format ---*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // This header defines Bitcode enum values for Clang serialized AST files.
 //
 // The enum values defined in this file should be considered permanent.  If
 // new features are added, they should have values added at the end of the
 // respective lists.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_CLANG_SERIALIZATION_ASTBITCODES_H
 #define LLVM_CLANG_SERIALIZATION_ASTBITCODES_H
 
 #include "clang/AST/DeclID.h"
 #include "clang/AST/DeclarationName.h"
 #include "clang/AST/Type.h"
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/OperatorKinds.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Serialization/SourceLocationEncoding.h"
 #include "llvm/ADT/DenseMapInfo.h"
 #include "llvm/Bitstream/BitCodes.h"
 #include "llvm/Support/MathExtras.h"
 #include <cassert>
 #include <cstdint>
 
 namespace clang {
 namespace serialization {
 
 /// AST file major version number supported by this version of
 /// Clang.
 ///
 /// Whenever the AST file format changes in a way that makes it
 /// incompatible with previous versions (such that a reader
 /// designed for the previous version could not support reading
 /// the new version), this number should be increased.
 ///
 /// Version 4 of AST files also requires that the version control branch and
 /// revision match exactly, since there is no backward compatibility of
 /// AST files at this time.
 const unsigned VERSION_MAJOR = 34;
 
 /// AST file minor version number supported by this version of
 /// Clang.
 ///
 /// Whenever the AST format changes in a way that is still
 /// compatible with previous versions (such that a reader designed
 /// for the previous version could still support reading the new
 /// version by ignoring new kinds of subblocks), this number
 /// should be increased.
 const unsigned VERSION_MINOR = 0;
 
 /// An ID number that refers to an identifier in an AST file.
 ///
 /// The ID numbers of identifiers are consecutive (in order of discovery)
 /// and start at 1. 0 is reserved for NULL.
 using IdentifierID = uint64_t;
 
 /// The number of predefined identifier IDs.
 const unsigned int NUM_PREDEF_IDENT_IDS = 1;
 
 /// An ID number that refers to a declaration in an AST file. See the comments
 /// in DeclIDBase for details.
 using DeclID = DeclIDBase::DeclID;
 
 /// An ID number that refers to a type in an AST file.
 ///
 /// The ID of a type is partitioned into three parts:
 /// - the lower three bits are used to store the const/volatile/restrict
 ///   qualifiers (as with QualType).
 /// - the next 29 bits provide a type index in the corresponding
 ///   module file.
 /// - the upper 32 bits provide a module file index.
 ///
 /// The type index values are partitioned into two
 /// sets. The values below NUM_PREDEF_TYPE_IDs are predefined type
 /// IDs (based on the PREDEF_TYPE_*_ID constants), with 0 as a
 /// placeholder for "no type". The module file index for predefined
 /// types are always 0 since they don't belong to any modules.
 /// Values from NUM_PREDEF_TYPE_IDs are other types that have
 /// serialized representations.
 using TypeID = uint64_t;
 /// Same with TypeID except that the LocalTypeID is only meaningful
 /// with the corresponding ModuleFile.
 ///
 /// FIXME: Make TypeID and LocalTypeID a class to improve the type
 /// safety.
 using LocalTypeID = TypeID;
 
 /// A type index; the type ID with the qualifier bits removed.
 /// Keep structure alignment 32-bit since the blob is assumed as 32-bit
 /// aligned.
 class TypeIdx {
   uint32_t ModuleFileIndex = 0;
   uint32_t Idx = 0;
 
 public:
   TypeIdx() = default;
 
   explicit TypeIdx(uint32_t ModuleFileIdx, uint32_t Idx)
       : ModuleFileIndex(ModuleFileIdx), Idx(Idx) {}
 
   uint32_t getModuleFileIndex() const { return ModuleFileIndex; }
 
   uint64_t getValue() const { return ((uint64_t)ModuleFileIndex << 32) | Idx; }
 
   TypeID asTypeID(unsigned FastQuals) const {
     if (Idx == uint32_t(-1))
       return TypeID(-1);
 
     unsigned Index = (Idx << Qualifiers::FastWidth) | FastQuals;
     return ((uint64_t)ModuleFileIndex << 32) | Index;
   }
 
   static TypeIdx fromTypeID(TypeID ID) {
     if (ID == TypeID(-1))
       return TypeIdx(0, -1);
 
     return TypeIdx(ID >> 32, (ID & llvm::maskTrailingOnes<TypeID>(32)) >>
                                  Qualifiers::FastWidth);
   }
 };
 
 static_assert(alignof(TypeIdx) == 4);
 
 /// A structure for putting "fast"-unqualified QualTypes into a
 /// DenseMap.  This uses the standard pointer hash function.
 struct UnsafeQualTypeDenseMapInfo {
   static bool isEqual(QualType A, QualType B) { return A == B; }
 
   static QualType getEmptyKey() {
     return QualType::getFromOpaquePtr((void *)1);
   }
 
   static QualType getTombstoneKey() {
     return QualType::getFromOpaquePtr((void *)2);
   }
 
   static unsigned getHashValue(QualType T) {
     assert(!T.getLocalFastQualifiers() &&
            "hash invalid for types with fast quals");
     uintptr_t v = reinterpret_cast<uintptr_t>(T.getAsOpaquePtr());
     return (unsigned(v) >> 4) ^ (unsigned(v) >> 9);
   }
 };
 
 /// An ID number that refers to a macro in an AST file.
 using MacroID = uint32_t;
 
 /// A global ID number that refers to a macro in an AST file.
 using GlobalMacroID = uint32_t;
 
 /// A local to a module ID number that refers to a macro in an
 /// AST file.
 using LocalMacroID = uint32_t;
 
 /// The number of predefined macro IDs.
 const unsigned int NUM_PREDEF_MACRO_IDS = 1;
 
 /// An ID number that refers to an ObjC selector in an AST file.
 using SelectorID = uint32_t;
 
 /// The number of predefined selector IDs.
 const unsigned int NUM_PREDEF_SELECTOR_IDS = 1;
 
 /// An ID number that refers to a set of CXXBaseSpecifiers in an
 /// AST file.
 using CXXBaseSpecifiersID = uint32_t;
 
 /// An ID number that refers to a list of CXXCtorInitializers in an
 /// AST file.
 using CXXCtorInitializersID = uint32_t;
 
 /// An ID number that refers to an entity in the detailed
 /// preprocessing record.
 using PreprocessedEntityID = uint32_t;
 
 /// An ID number that refers to a submodule in a module file.
 using SubmoduleID = uint32_t;
 
 /// The number of predefined submodule IDs.
 const unsigned int NUM_PREDEF_SUBMODULE_IDS = 1;
 
 /// 32 aligned uint64_t in the AST file. Use splitted 64-bit integer into
 /// low/high parts to keep structure alignment 32-bit (it is important
 /// because blobs in bitstream are 32-bit aligned). This structure is
 /// serialized "as is" to the AST file.
 class UnalignedUInt64 {
   uint32_t BitLow = 0;
   uint32_t BitHigh = 0;
 
 public:
   UnalignedUInt64() = default;
   UnalignedUInt64(uint64_t BitOffset) { set(BitOffset); }
 
   void set(uint64_t Offset) {
     BitLow = Offset;
     BitHigh = Offset >> 32;
   }
 
   uint64_t get() const { return BitLow | (uint64_t(BitHigh) << 32); }
 };
 
 /// Source range/offset of a preprocessed entity.
 class PPEntityOffset {
   using RawLocEncoding = SourceLocationEncoding::RawLocEncoding;
 
   /// Raw source location of beginning of range.
   UnalignedUInt64 Begin;
 
   /// Raw source location of end of range.
   UnalignedUInt64 End;
 
   /// Offset in the AST file relative to ModuleFile::MacroOffsetsBase.
   uint32_t BitOffset;
 
 public:
   PPEntityOffset(RawLocEncoding Begin, RawLocEncoding End, uint32_t BitOffset)
       : Begin(Begin), End(End), BitOffset(BitOffset) {}
 
   RawLocEncoding getBegin() const { return Begin.get(); }
   RawLocEncoding getEnd() const { return End.get(); }
 
   uint32_t getOffset() const { return BitOffset; }
 };
 
 /// Source range of a skipped preprocessor region
 class PPSkippedRange {
   using RawLocEncoding = SourceLocationEncoding::RawLocEncoding;
 
   /// Raw source location of beginning of range.
   UnalignedUInt64 Begin;
   /// Raw source location of end of range.
   UnalignedUInt64 End;
 
 public:
   PPSkippedRange(RawLocEncoding Begin, RawLocEncoding End)
       : Begin(Begin), End(End) {}
 
   RawLocEncoding getBegin() const { return Begin.get(); }
   RawLocEncoding getEnd() const { return End.get(); }
 };
 
 /// Source location and bit offset of a declaration. Keep
 /// structure alignment 32-bit since the blob is assumed as 32-bit aligned.
 class DeclOffset {
   using RawLocEncoding = SourceLocationEncoding::RawLocEncoding;
 
   /// Raw source location.
   UnalignedUInt64 RawLoc;
 
   /// Offset relative to the start of the DECLTYPES_BLOCK block.
   UnalignedUInt64 BitOffset;
 
 public:
   DeclOffset() = default;
   DeclOffset(RawLocEncoding RawLoc, uint64_t BitOffset,
              uint64_t DeclTypesBlockStartOffset)
       : RawLoc(RawLoc) {
     setBitOffset(BitOffset, DeclTypesBlockStartOffset);
   }
 
   void setRawLoc(RawLocEncoding Loc) { RawLoc = Loc; }
 
   RawLocEncoding getRawLoc() const { return RawLoc.get(); }
 
   void setBitOffset(uint64_t Offset, const uint64_t DeclTypesBlockStartOffset) {
     BitOffset.set(Offset - DeclTypesBlockStartOffset);
   }
 
   uint64_t getBitOffset(const uint64_t DeclTypesBlockStartOffset) const {
     return BitOffset.get() + DeclTypesBlockStartOffset;
   }
 };
 
 // The unaligned decl ID used in the Blobs of bistreams.
 using unaligned_decl_id_t =
     llvm::support::detail::packed_endian_specific_integral<
         serialization::DeclID, llvm::endianness::native,
         llvm::support::unaligned>;
 
 /// The number of predefined preprocessed entity IDs.
 const unsigned int NUM_PREDEF_PP_ENTITY_IDS = 1;
 
 /// Describes the various kinds of blocks that occur within
 /// an AST file.
 enum BlockIDs {
   /// The AST block, which acts as a container around the
   /// full AST block.
   AST_BLOCK_ID = llvm::bitc::FIRST_APPLICATION_BLOCKID,
 
   /// The block containing information about the source
   /// manager.
   SOURCE_MANAGER_BLOCK_ID,
 
   /// The block containing information about the
   /// preprocessor.
   PREPROCESSOR_BLOCK_ID,
 
   /// The block containing the definitions of all of the
   /// types and decls used within the AST file.
   DECLTYPES_BLOCK_ID,
 
   /// The block containing the detailed preprocessing record.
   PREPROCESSOR_DETAIL_BLOCK_ID,
 
   /// The block containing the submodule structure.
   SUBMODULE_BLOCK_ID,
 
   /// The block containing comments.
   COMMENTS_BLOCK_ID,
 
   /// The control block, which contains all of the
   /// information that needs to be validated prior to committing
   /// to loading the AST file.
   CONTROL_BLOCK_ID,
 
   /// The block of input files, which were used as inputs
   /// to create this AST file.
   ///
   /// This block is part of the control block.
   INPUT_FILES_BLOCK_ID,
 
   /// The block of configuration options, used to check that
   /// a module is being used in a configuration compatible with the
   /// configuration in which it was built.
   ///
   /// This block is part of the control block.
   OPTIONS_BLOCK_ID,
 
   /// A block containing a module file extension.
   EXTENSION_BLOCK_ID,
 
   /// A block with unhashed content.
   ///
   /// These records should not change the \a ASTFileSignature.  See \a
   /// UnhashedControlBlockRecordTypes for the list of records.
   UNHASHED_CONTROL_BLOCK_ID,
 };
 
 /// Record types that occur within the control block.
 enum ControlRecordTypes {
   /// AST file metadata, including the AST file version number
   /// and information about the compiler used to build this AST file.
   METADATA = 1,
 
   /// Record code for another AST file imported by this AST file.
   IMPORT,
 
   /// Record code for the original file that was used to
   /// generate the AST file, including both its file ID and its
   /// name.
   ORIGINAL_FILE,
 
   /// Record code for file ID of the file or buffer that was used to
   /// generate the AST file.
   ORIGINAL_FILE_ID,
 
   /// Offsets into the input-files block where input files
   /// reside.
   INPUT_FILE_OFFSETS,
 
   /// Record code for the module name.
   MODULE_NAME,
 
   /// Record code for the module map file that was used to build this
   /// AST file.
   MODULE_MAP_FILE,
 
   /// Record code for the module build directory.
   MODULE_DIRECTORY,
 };
 
 /// Record types that occur within the options block inside
 /// the control block.
 enum OptionsRecordTypes {
   /// Record code for the language options table.
   ///
   /// The record with this code contains the contents of the
   /// LangOptions structure. We serialize the entire contents of
   /// the structure, and let the reader decide which options are
   /// actually important to check.
   LANGUAGE_OPTIONS = 1,
 
   /// Record code for the target options table.
   TARGET_OPTIONS,
 
   /// Record code for the filesystem options table.
   FILE_SYSTEM_OPTIONS,
 
   /// Record code for the headers search options table.
   HEADER_SEARCH_OPTIONS,
 
   /// Record code for the preprocessor options table.
   PREPROCESSOR_OPTIONS,
 };
 
 /// Record codes for the unhashed control block.
 enum UnhashedControlBlockRecordTypes {
   /// Record code for the signature that identifiers this AST file.
   SIGNATURE = 1,
 
   /// Record code for the content hash of the AST block.
   AST_BLOCK_HASH,
 
   /// Record code for the diagnostic options table.
   DIAGNOSTIC_OPTIONS,
 
   /// Record code for the headers search paths.
   HEADER_SEARCH_PATHS,
 
   /// Record code for \#pragma diagnostic mappings.
   DIAG_PRAGMA_MAPPINGS,
 
   /// Record code for the indices of used header search entries.
   HEADER_SEARCH_ENTRY_USAGE,
 
   /// Record code for the indices of used VFSs.
   VFS_USAGE,
 };
 
 /// Record code for extension blocks.
 enum ExtensionBlockRecordTypes {
   /// Metadata describing this particular extension.
   EXTENSION_METADATA = 1,
 
   /// The first record ID allocated to the extensions themselves.
   FIRST_EXTENSION_RECORD_ID = 4
 };
 
 /// Record types that occur within the input-files block
 /// inside the control block.
 enum InputFileRecordTypes {
   /// An input file.
   INPUT_FILE = 1,
 
   /// The input file content hash
   INPUT_FILE_HASH
 };
 
 /// Record types that occur within the AST block itself.
 enum ASTRecordTypes {
   /// Record code for the offsets of each type.
   ///
   /// The TYPE_OFFSET constant describes the record that occurs
   /// within the AST block. The record itself is an array of offsets that
   /// point into the declarations and types block (identified by
   /// DECLTYPES_BLOCK_ID). The index into the array is based on the ID
   /// of a type. For a given type ID @c T, the lower three bits of
   /// @c T are its qualifiers (const, volatile, restrict), as in
   /// the QualType class. The upper bits, after being shifted and
   /// subtracting NUM_PREDEF_TYPE_IDS, are used to index into the
   /// TYPE_OFFSET block to determine the offset of that type's
   /// corresponding record within the DECLTYPES_BLOCK_ID block.
   TYPE_OFFSET = 1,
 
   /// Record code for the offsets of each decl.
   ///
   /// The DECL_OFFSET constant describes the record that occurs
   /// within the block identified by DECL_OFFSETS_BLOCK_ID within
   /// the AST block. The record itself is an array of offsets that
   /// point into the declarations and types block (identified by
   /// DECLTYPES_BLOCK_ID). The declaration ID is an index into this
   /// record, after subtracting one to account for the use of
   /// declaration ID 0 for a NULL declaration pointer. Index 0 is
   /// reserved for the translation unit declaration.
   DECL_OFFSET = 2,
 
   /// Record code for the table of offsets of each
   /// identifier ID.
   ///
   /// The offset table contains offsets into the blob stored in
   /// the IDENTIFIER_TABLE record. Each offset points to the
   /// NULL-terminated string that corresponds to that identifier.
   IDENTIFIER_OFFSET = 3,
 
   /// This is so that older clang versions, before the introduction
   /// of the control block, can read and reject the newer PCH format.
   /// *DON'T CHANGE THIS NUMBER*.
   METADATA_OLD_FORMAT = 4,
 
   /// Record code for the identifier table.
   ///
   /// The identifier table is a simple blob that contains
   /// NULL-terminated strings for all of the identifiers
   /// referenced by the AST file. The IDENTIFIER_OFFSET table
   /// contains the mapping from identifier IDs to the characters
   /// in this blob. Note that the starting offsets of all of the
   /// identifiers are odd, so that, when the identifier offset
   /// table is loaded in, we can use the low bit to distinguish
   /// between offsets (for unresolved identifier IDs) and
   /// IdentifierInfo pointers (for already-resolved identifier
   /// IDs).
   IDENTIFIER_TABLE = 5,
 
   /// Record code for the array of eagerly deserialized decls.
   ///
   /// The AST file contains a list of all of the declarations that should be
   /// eagerly deserialized present within the parsed headers, stored as an
   /// array of declaration IDs. These declarations will be
   /// reported to the AST consumer after the AST file has been
   /// read, since their presence can affect the semantics of the
   /// program (e.g., for code generation).
   EAGERLY_DESERIALIZED_DECLS = 6,
 
   /// Record code for the set of non-builtin, special
   /// types.
   ///
   /// This record contains the type IDs for the various type nodes
   /// that are constructed during semantic analysis (e.g.,
   /// __builtin_va_list). The SPECIAL_TYPE_* constants provide
   /// offsets into this record.
   SPECIAL_TYPES = 7,
 
   /// Record code for the extra statistics we gather while
   /// generating an AST file.
   STATISTICS = 8,
 
   /// Record code for the array of tentative definitions.
   TENTATIVE_DEFINITIONS = 9,
 
   // ID 10 used to be for a list of extern "C" declarations.
 
   /// Record code for the table of offsets into the
   /// Objective-C method pool.
   SELECTOR_OFFSETS = 11,
 
   /// Record code for the Objective-C method pool,
   METHOD_POOL = 12,
 
   /// The value of the next __COUNTER__ to dispense.
   /// [PP_COUNTER_VALUE, Val]
   PP_COUNTER_VALUE = 13,
 
   /// Record code for the table of offsets into the block
   /// of source-location information.
   SOURCE_LOCATION_OFFSETS = 14,
 
   // ID 15 used to be for source location entry preloads.
 
   /// Record code for the set of ext_vector type names.
   EXT_VECTOR_DECLS = 16,
 
   /// Record code for the array of unused file scoped decls.
   UNUSED_FILESCOPED_DECLS = 17,
 
   /// Record code for the table of offsets to entries in the
   /// preprocessing record.
   PPD_ENTITIES_OFFSETS = 18,
 
   /// Record code for the array of VTable uses.
   VTABLE_USES = 19,
 
   // ID 20 used to be for a list of dynamic classes.
 
   /// Record code for referenced selector pool.
   REFERENCED_SELECTOR_POOL = 21,
 
   /// Record code for an update to the TU's lexically contained
   /// declarations.
   TU_UPDATE_LEXICAL = 22,
 
   // ID 23 used to be for a list of local redeclarations.
 
   /// Record code for declarations that Sema keeps references of.
   SEMA_DECL_REFS = 24,
 
   /// Record code for weak undeclared identifiers.
   WEAK_UNDECLARED_IDENTIFIERS = 25,
 
   /// Record code for pending implicit instantiations.
   PENDING_IMPLICIT_INSTANTIATIONS = 26,
 
   // ID 27 used to be for a list of replacement decls.
 
   /// Record code for an update to a decl context's lookup table.
   ///
   /// In practice, this should only be used for the TU and namespaces.
   UPDATE_VISIBLE = 28,
 
   /// Record for offsets of DECL_UPDATES records for declarations
   /// that were modified after being deserialized and need updates.
   DECL_UPDATE_OFFSETS = 29,
 
   // ID 30 used to be a decl update record. These are now in the DECLTYPES
   // block.
 
   // ID 31 used to be a list of offsets to DECL_CXX_BASE_SPECIFIERS records.
 
   // ID 32 used to be the code for \#pragma diagnostic mappings.
 
   /// Record code for special CUDA declarations.
   CUDA_SPECIAL_DECL_REFS = 33,
 
   /// Record code for header search information.
   HEADER_SEARCH_TABLE = 34,
 
   /// Record code for floating point \#pragma options.
   FP_PRAGMA_OPTIONS = 35,
 
   /// Record code for enabled OpenCL extensions.
   OPENCL_EXTENSIONS = 36,
 
   /// The list of delegating constructor declarations.
   DELEGATING_CTORS = 37,
 
   /// Record code for the set of known namespaces, which are used
   /// for typo correction.
   KNOWN_NAMESPACES = 38,
 
   /// Record code for the remapping information used to relate
   /// loaded modules to the various offsets and IDs(e.g., source location
   /// offests, declaration and type IDs) that are used in that module to
   /// refer to other modules.
   MODULE_OFFSET_MAP = 39,
 
   /// Record code for the source manager line table information,
   /// which stores information about \#line directives.
   SOURCE_MANAGER_LINE_TABLE = 40,
 
   /// Record code for map of Objective-C class definition IDs to the
   /// ObjC categories in a module that are attached to that class.
   OBJC_CATEGORIES_MAP = 41,
 
   /// Record code for a file sorted array of DeclIDs in a module.
   FILE_SORTED_DECLS = 42,
 
   /// Record code for an array of all of the (sub)modules that were
   /// imported by the AST file.
   IMPORTED_MODULES = 43,
 
   // ID 44 used to be a table of merged canonical declarations.
   // ID 45 used to be a list of declaration IDs of local redeclarations.
 
   /// Record code for the array of Objective-C categories (including
   /// extensions).
   ///
   /// This array can only be interpreted properly using the Objective-C
   /// categories map.
   OBJC_CATEGORIES = 46,
 
   /// Record code for the table of offsets of each macro ID.
   ///
   /// The offset table contains offsets into the blob stored in
   /// the preprocessor block. Each offset points to the corresponding
   /// macro definition.
   MACRO_OFFSET = 47,
 
   /// A list of "interesting" identifiers. Only used in C++ (where we
   /// don't normally do lookups into the serialized identifier table). These
   /// are eagerly deserialized.
   INTERESTING_IDENTIFIERS = 48,
 
   /// Record code for undefined but used functions and variables that
   /// need a definition in this TU.
   UNDEFINED_BUT_USED = 49,
 
   /// Record code for late parsed template functions.
   LATE_PARSED_TEMPLATE = 50,
 
   /// Record code for \#pragma optimize options.
   OPTIMIZE_PRAGMA_OPTIONS = 51,
 
   /// Record code for potentially unused local typedef names.
   UNUSED_LOCAL_TYPEDEF_NAME_CANDIDATES = 52,
 
   // ID 53 used to be a table of constructor initializer records.
 
   /// Delete expressions that will be analyzed later.
   DELETE_EXPRS_TO_ANALYZE = 54,
 
   /// Record code for \#pragma ms_struct options.
   MSSTRUCT_PRAGMA_OPTIONS = 55,
 
   /// Record code for \#pragma ms_struct options.
   POINTERS_TO_MEMBERS_PRAGMA_OPTIONS = 56,
 
   /// Number of unmatched #pragma clang cuda_force_host_device begin
   /// directives we've seen.
   CUDA_PRAGMA_FORCE_HOST_DEVICE_DEPTH = 57,
 
   /// Record code for types associated with OpenCL extensions.
   OPENCL_EXTENSION_TYPES = 58,
 
   /// Record code for declarations associated with OpenCL extensions.
   OPENCL_EXTENSION_DECLS = 59,
 
   MODULAR_CODEGEN_DECLS = 60,
 
   /// Record code for \#pragma align/pack options.
   ALIGN_PACK_PRAGMA_OPTIONS = 61,
 
   /// The stack of open #ifs/#ifdefs recorded in a preamble.
   PP_CONDITIONAL_STACK = 62,
 
   /// A table of skipped ranges within the preprocessing record.
   PPD_SKIPPED_RANGES = 63,
 
   /// Record code for the Decls to be checked for deferred diags.
   DECLS_TO_CHECK_FOR_DEFERRED_DIAGS = 64,
 
   /// Record code for \#pragma float_control options.
   FLOAT_CONTROL_PRAGMA_OPTIONS = 65,
 
   /// ID 66 used to be the list of included files.
 
   /// Record code for an unterminated \#pragma clang assume_nonnull begin
   /// recorded in a preamble.
   PP_ASSUME_NONNULL_LOC = 67,
 
   /// Record code for lexical and visible block for delayed namespace in
   /// reduced BMI.
   DELAYED_NAMESPACE_LEXICAL_VISIBLE_RECORD = 68,
 
   /// Record code for \#pragma clang unsafe_buffer_usage begin/end
   PP_UNSAFE_BUFFER_USAGE = 69,
 
   /// Record code for vtables to emit.
   VTABLES_TO_EMIT = 70,
 
   /// Record code for related declarations that have to be deserialized together
   /// from the same module.
   RELATED_DECLS_MAP = 71,
 
   /// Record code for Sema's vector of functions/blocks with effects to
   /// be verified.
   DECLS_WITH_EFFECTS_TO_VERIFY = 72,
 
   /// Record code for updated specialization
   UPDATE_SPECIALIZATION = 73,
 
   CXX_ADDED_TEMPLATE_SPECIALIZATION = 74,
 
   CXX_ADDED_TEMPLATE_PARTIAL_SPECIALIZATION = 75,
 
   UPDATE_MODULE_LOCAL_VISIBLE = 76,
 
   UPDATE_TU_LOCAL_VISIBLE = 77,
 };
 
 /// Record types used within a source manager block.
 enum SourceManagerRecordTypes {
   /// Describes a source location entry (SLocEntry) for a
   /// file.
   SM_SLOC_FILE_ENTRY = 1,
 
   /// Describes a source location entry (SLocEntry) for a
   /// buffer.
   SM_SLOC_BUFFER_ENTRY = 2,
 
   /// Describes a blob that contains the data for a buffer
   /// entry. This kind of record always directly follows a
   /// SM_SLOC_BUFFER_ENTRY record or a SM_SLOC_FILE_ENTRY with an
   /// overridden buffer.
   SM_SLOC_BUFFER_BLOB = 3,
 
   /// Describes a zlib-compressed blob that contains the data for
   /// a buffer entry.
   SM_SLOC_BUFFER_BLOB_COMPRESSED = 4,
 
   /// Describes a source location entry (SLocEntry) for a
   /// macro expansion.
   SM_SLOC_EXPANSION_ENTRY = 5
 };
 
 /// Record types used within a preprocessor block.
 enum PreprocessorRecordTypes {
   // The macros in the PP section are a PP_MACRO_* instance followed by a
   // list of PP_TOKEN instances for each token in the definition.
 
   /// An object-like macro definition.
   /// [PP_MACRO_OBJECT_LIKE, IdentInfoID, SLoc, IsUsed]
   PP_MACRO_OBJECT_LIKE = 1,
 
   /// A function-like macro definition.
   /// [PP_MACRO_FUNCTION_LIKE, \<ObjectLikeStuff>, IsC99Varargs,
   /// IsGNUVarars, NumArgs, ArgIdentInfoID* ]
   PP_MACRO_FUNCTION_LIKE = 2,
 
   /// Describes one token.
   /// [PP_TOKEN, SLoc, Length, IdentInfoID, Kind, Flags]
   PP_TOKEN = 3,
 
   /// The macro directives history for a particular identifier.
   PP_MACRO_DIRECTIVE_HISTORY = 4,
 
   /// A macro directive exported by a module.
   /// [PP_MODULE_MACRO, SubmoduleID, MacroID, (Overridden SubmoduleID)*]
   PP_MODULE_MACRO = 5,
 };
 
 /// Record types used within a preprocessor detail block.
 enum PreprocessorDetailRecordTypes {
   /// Describes a macro expansion within the preprocessing record.
   PPD_MACRO_EXPANSION = 0,
 
   /// Describes a macro definition within the preprocessing record.
   PPD_MACRO_DEFINITION = 1,
 
   /// Describes an inclusion directive within the preprocessing
   /// record.
   PPD_INCLUSION_DIRECTIVE = 2
 };
 
 /// Record types used within a submodule description block.
 enum SubmoduleRecordTypes {
   /// Metadata for submodules as a whole.
   SUBMODULE_METADATA = 0,
 
   /// Defines the major attributes of a submodule, including its
   /// name and parent.
   SUBMODULE_DEFINITION = 1,
 
   /// Specifies the umbrella header used to create this module,
   /// if any.
   SUBMODULE_UMBRELLA_HEADER = 2,
 
   /// Specifies a header that falls into this (sub)module.
   SUBMODULE_HEADER = 3,
 
   /// Specifies a top-level header that falls into this (sub)module.
   SUBMODULE_TOPHEADER = 4,
 
   /// Specifies an umbrella directory.
   SUBMODULE_UMBRELLA_DIR = 5,
 
   /// Specifies the submodules that are imported by this
   /// submodule.
   SUBMODULE_IMPORTS = 6,
 
   /// Specifies the submodules that are re-exported from this
   /// submodule.
   SUBMODULE_EXPORTS = 7,
 
   /// Specifies a required feature.
   SUBMODULE_REQUIRES = 8,
 
   /// Specifies a header that has been explicitly excluded
   /// from this submodule.
   SUBMODULE_EXCLUDED_HEADER = 9,
 
   /// Specifies a library or framework to link against.
   SUBMODULE_LINK_LIBRARY = 10,
 
   /// Specifies a configuration macro for this module.
   SUBMODULE_CONFIG_MACRO = 11,
 
   /// Specifies a conflict with another module.
   SUBMODULE_CONFLICT = 12,
 
   /// Specifies a header that is private to this submodule.
   SUBMODULE_PRIVATE_HEADER = 13,
 
   /// Specifies a header that is part of the module but must be
   /// textually included.
   SUBMODULE_TEXTUAL_HEADER = 14,
 
   /// Specifies a header that is private to this submodule but
   /// must be textually included.
   SUBMODULE_PRIVATE_TEXTUAL_HEADER = 15,
 
   /// Specifies some declarations with initializers that must be
   /// emitted to initialize the module.
   SUBMODULE_INITIALIZERS = 16,
 
   /// Specifies the name of the module that will eventually
   /// re-export the entities in this module.
   SUBMODULE_EXPORT_AS = 17,
 
   /// Specifies affecting modules that were not imported.
   SUBMODULE_AFFECTING_MODULES = 18,
 };
 
 /// Record types used within a comments block.
 enum CommentRecordTypes { COMMENTS_RAW_COMMENT = 0 };
 
 /// \defgroup ASTAST AST file AST constants
 ///
 /// The constants in this group describe various components of the
 /// abstract syntax tree within an AST file.
 ///
 /// @{
 
 /// Predefined type IDs.
 ///
 /// These type IDs correspond to predefined types in the AST
 /// context, such as built-in types (int) and special place-holder
 /// types (the \<overload> and \<dependent> type markers). Such
 /// types are never actually serialized, since they will be built
 /// by the AST context when it is created.
 enum PredefinedTypeIDs {
   /// The NULL type.
   PREDEF_TYPE_NULL_ID = 0,
 
   /// The void type.
   PREDEF_TYPE_VOID_ID = 1,
 
   /// The 'bool' or '_Bool' type.
   PREDEF_TYPE_BOOL_ID = 2,
 
   /// The 'char' type, when it is unsigned.
   PREDEF_TYPE_CHAR_U_ID = 3,
 
   /// The 'unsigned char' type.
   PREDEF_TYPE_UCHAR_ID = 4,
 
   /// The 'unsigned short' type.
   PREDEF_TYPE_USHORT_ID = 5,
 
   /// The 'unsigned int' type.
   PREDEF_TYPE_UINT_ID = 6,
 
   /// The 'unsigned long' type.
   PREDEF_TYPE_ULONG_ID = 7,
 
   /// The 'unsigned long long' type.
   PREDEF_TYPE_ULONGLONG_ID = 8,
 
   /// The 'char' type, when it is signed.
   PREDEF_TYPE_CHAR_S_ID = 9,
 
   /// The 'signed char' type.
   PREDEF_TYPE_SCHAR_ID = 10,
 
   /// The C++ 'wchar_t' type.
   PREDEF_TYPE_WCHAR_ID = 11,
 
   /// The (signed) 'short' type.
   PREDEF_TYPE_SHORT_ID = 12,
 
   /// The (signed) 'int' type.
   PREDEF_TYPE_INT_ID = 13,
 
   /// The (signed) 'long' type.
   PREDEF_TYPE_LONG_ID = 14,
 
   /// The (signed) 'long long' type.
   PREDEF_TYPE_LONGLONG_ID = 15,
 
   /// The 'float' type.
   PREDEF_TYPE_FLOAT_ID = 16,
 
   /// The 'double' type.
   PREDEF_TYPE_DOUBLE_ID = 17,
 
   /// The 'long double' type.
   PREDEF_TYPE_LONGDOUBLE_ID = 18,
 
   /// The placeholder type for overloaded function sets.
   PREDEF_TYPE_OVERLOAD_ID = 19,
 
   /// The placeholder type for dependent types.
   PREDEF_TYPE_DEPENDENT_ID = 20,
 
   /// The '__uint128_t' type.
   PREDEF_TYPE_UINT128_ID = 21,
 
   /// The '__int128_t' type.
   PREDEF_TYPE_INT128_ID = 22,
 
   /// The type of 'nullptr'.
   PREDEF_TYPE_NULLPTR_ID = 23,
 
   /// The C++ 'char16_t' type.
   PREDEF_TYPE_CHAR16_ID = 24,
 
   /// The C++ 'char32_t' type.
   PREDEF_TYPE_CHAR32_ID = 25,
 
   /// The ObjC 'id' type.
   PREDEF_TYPE_OBJC_ID = 26,
 
   /// The ObjC 'Class' type.
   PREDEF_TYPE_OBJC_CLASS = 27,
 
   /// The ObjC 'SEL' type.
   PREDEF_TYPE_OBJC_SEL = 28,
 
   /// The 'unknown any' placeholder type.
   PREDEF_TYPE_UNKNOWN_ANY = 29,
 
   /// The placeholder type for bound member functions.
   PREDEF_TYPE_BOUND_MEMBER = 30,
 
   /// The "auto" deduction type.
   PREDEF_TYPE_AUTO_DEDUCT = 31,
 
   /// The "auto &&" deduction type.
   PREDEF_TYPE_AUTO_RREF_DEDUCT = 32,
 
   /// The OpenCL 'half' / ARM NEON __fp16 type.
   PREDEF_TYPE_HALF_ID = 33,
 
   /// ARC's unbridged-cast placeholder type.
   PREDEF_TYPE_ARC_UNBRIDGED_CAST = 34,
 
   /// The pseudo-object placeholder type.
   PREDEF_TYPE_PSEUDO_OBJECT = 35,
 
   /// The placeholder type for builtin functions.
   PREDEF_TYPE_BUILTIN_FN = 36,
 
   /// OpenCL event type.
   PREDEF_TYPE_EVENT_ID = 37,
 
   /// OpenCL clk event type.
   PREDEF_TYPE_CLK_EVENT_ID = 38,
 
   /// OpenCL sampler type.
   PREDEF_TYPE_SAMPLER_ID = 39,
 
   /// OpenCL queue type.
   PREDEF_TYPE_QUEUE_ID = 40,
 
   /// OpenCL reserve_id type.
   PREDEF_TYPE_RESERVE_ID_ID = 41,
 
   /// The placeholder type for an array section.
   PREDEF_TYPE_ARRAY_SECTION = 42,
 
   /// The '__float128' type
   PREDEF_TYPE_FLOAT128_ID = 43,
 
   /// The '_Float16' type
   PREDEF_TYPE_FLOAT16_ID = 44,
 
   /// The C++ 'char8_t' type.
   PREDEF_TYPE_CHAR8_ID = 45,
 
   /// \brief The 'short _Accum' type
   PREDEF_TYPE_SHORT_ACCUM_ID = 46,
 
   /// \brief The '_Accum' type
   PREDEF_TYPE_ACCUM_ID = 47,
 
   /// \brief The 'long _Accum' type
   PREDEF_TYPE_LONG_ACCUM_ID = 48,
 
   /// \brief The 'unsigned short _Accum' type
   PREDEF_TYPE_USHORT_ACCUM_ID = 49,
 
   /// \brief The 'unsigned _Accum' type
   PREDEF_TYPE_UACCUM_ID = 50,
 
   /// \brief The 'unsigned long _Accum' type
   PREDEF_TYPE_ULONG_ACCUM_ID = 51,
 
   /// \brief The 'short _Fract' type
   PREDEF_TYPE_SHORT_FRACT_ID = 52,
 
   /// \brief The '_Fract' type
   PREDEF_TYPE_FRACT_ID = 53,
 
   /// \brief The 'long _Fract' type
   PREDEF_TYPE_LONG_FRACT_ID = 54,
 
   /// \brief The 'unsigned short _Fract' type
   PREDEF_TYPE_USHORT_FRACT_ID = 55,
 
   /// \brief The 'unsigned _Fract' type
   PREDEF_TYPE_UFRACT_ID = 56,
 
   /// \brief The 'unsigned long _Fract' type
   PREDEF_TYPE_ULONG_FRACT_ID = 57,
 
   /// \brief The '_Sat short _Accum' type
   PREDEF_TYPE_SAT_SHORT_ACCUM_ID = 58,
 
   /// \brief The '_Sat _Accum' type
   PREDEF_TYPE_SAT_ACCUM_ID = 59,
 
   /// \brief The '_Sat long _Accum' type
   PREDEF_TYPE_SAT_LONG_ACCUM_ID = 60,
 
   /// \brief The '_Sat unsigned short _Accum' type
   PREDEF_TYPE_SAT_USHORT_ACCUM_ID = 61,
 
   /// \brief The '_Sat unsigned _Accum' type
   PREDEF_TYPE_SAT_UACCUM_ID = 62,
 
   /// \brief The '_Sat unsigned long _Accum' type
   PREDEF_TYPE_SAT_ULONG_ACCUM_ID = 63,
 
   /// \brief The '_Sat short _Fract' type
   PREDEF_TYPE_SAT_SHORT_FRACT_ID = 64,
 
   /// \brief The '_Sat _Fract' type
   PREDEF_TYPE_SAT_FRACT_ID = 65,
 
   /// \brief The '_Sat long _Fract' type
   PREDEF_TYPE_SAT_LONG_FRACT_ID = 66,
 
   /// \brief The '_Sat unsigned short _Fract' type
   PREDEF_TYPE_SAT_USHORT_FRACT_ID = 67,
 
   /// \brief The '_Sat unsigned _Fract' type
   PREDEF_TYPE_SAT_UFRACT_ID = 68,
 
   /// \brief The '_Sat unsigned long _Fract' type
   PREDEF_TYPE_SAT_ULONG_FRACT_ID = 69,
 
   /// The placeholder type for OpenMP array shaping operation.
   PREDEF_TYPE_OMP_ARRAY_SHAPING = 70,
 
   /// The placeholder type for OpenMP iterator expression.
   PREDEF_TYPE_OMP_ITERATOR = 71,
 
   /// A placeholder type for incomplete matrix index operations.
   PREDEF_TYPE_INCOMPLETE_MATRIX_IDX = 72,
 
   /// \brief The '__bf16' type
   PREDEF_TYPE_BFLOAT16_ID = 73,
 
   /// \brief The '__ibm128' type
   PREDEF_TYPE_IBM128_ID = 74,
 
 /// OpenCL image types with auto numeration
 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix)                   \
   PREDEF_TYPE_##Id##_ID,
 #include "clang/Basic/OpenCLImageTypes.def"
 /// \brief OpenCL extension types with auto numeration
 #define EXT_OPAQUE_TYPE(ExtType, Id, Ext) PREDEF_TYPE_##Id##_ID,
 #include "clang/Basic/OpenCLExtensionTypes.def"
 // \brief SVE types with auto numeration
 #define SVE_TYPE(Name, Id, SingletonId) PREDEF_TYPE_##Id##_ID,
 #include "clang/Basic/AArch64SVEACLETypes.def"
 // \brief  PowerPC MMA types with auto numeration
 #define PPC_VECTOR_TYPE(Name, Id, Size) PREDEF_TYPE_##Id##_ID,
 #include "clang/Basic/PPCTypes.def"
 // \brief RISC-V V types with auto numeration
 #define RVV_TYPE(Name, Id, SingletonId) PREDEF_TYPE_##Id##_ID,
 #include "clang/Basic/RISCVVTypes.def"
 // \brief WebAssembly reference types with auto numeration
 #define WASM_TYPE(Name, Id, SingletonId) PREDEF_TYPE_##Id##_ID,
 #include "clang/Basic/WebAssemblyReferenceTypes.def"
 // \brief AMDGPU types with auto numeration
 #define AMDGPU_TYPE(Name, Id, SingletonId, Width, Align) PREDEF_TYPE_##Id##_ID,
 #include "clang/Basic/AMDGPUTypes.def"
 // \brief HLSL intangible types with auto numeration
 #define HLSL_INTANGIBLE_TYPE(Name, Id, SingletonId) PREDEF_TYPE_##Id##_ID,
 #include "clang/Basic/HLSLIntangibleTypes.def"
 
   /// The placeholder type for unresolved templates.
   PREDEF_TYPE_UNRESOLVED_TEMPLATE,
   // Sentinel value. Considered a predefined type but not useable as one.
   PREDEF_TYPE_LAST_ID
 };
 
 /// The number of predefined type IDs that are reserved for
 /// the PREDEF_TYPE_* constants.
 ///
 /// Type IDs for non-predefined types will start at
 /// NUM_PREDEF_TYPE_IDs.
 const unsigned NUM_PREDEF_TYPE_IDS = 513;
 
 // Ensure we do not overrun the predefined types we reserved
 // in the enum PredefinedTypeIDs above.
 static_assert(PREDEF_TYPE_LAST_ID < NUM_PREDEF_TYPE_IDS,
               "Too many enumerators in PredefinedTypeIDs. Review the value of "
               "NUM_PREDEF_TYPE_IDS");
 
 /// Record codes for each kind of type.
 ///
 /// These constants describe the type records that can occur within a
 /// block identified by DECLTYPES_BLOCK_ID in the AST file. Each
 /// constant describes a record for a specific type class in the
 /// AST. Note that DeclCode values share this code space.
 enum TypeCode {
 #define TYPE_BIT_CODE(CLASS_ID, CODE_ID, CODE_VALUE)                           \
   TYPE_##CODE_ID = CODE_VALUE,
 #include "clang/Serialization/TypeBitCodes.def"
 
   /// An ExtQualType record.
   TYPE_EXT_QUAL = 1
 };
 
 /// The type IDs for special types constructed by semantic
 /// analysis.
 ///
 /// The constants in this enumeration are indices into the
 /// SPECIAL_TYPES record.
 enum SpecialTypeIDs {
   /// CFConstantString type
   SPECIAL_TYPE_CF_CONSTANT_STRING = 0,
 
   /// C FILE typedef type
   SPECIAL_TYPE_FILE = 1,
 
   /// C jmp_buf typedef type
   SPECIAL_TYPE_JMP_BUF = 2,
 
   /// C sigjmp_buf typedef type
   SPECIAL_TYPE_SIGJMP_BUF = 3,
 
   /// Objective-C "id" redefinition type
   SPECIAL_TYPE_OBJC_ID_REDEFINITION = 4,
 
   /// Objective-C "Class" redefinition type
   SPECIAL_TYPE_OBJC_CLASS_REDEFINITION = 5,
 
   /// Objective-C "SEL" redefinition type
   SPECIAL_TYPE_OBJC_SEL_REDEFINITION = 6,
 
   /// C ucontext_t typedef type
   SPECIAL_TYPE_UCONTEXT_T = 7
 };
 
 /// The number of special type IDs.
 const unsigned NumSpecialTypeIDs = 8;
 
 /// Record of updates for a declaration that was modified after
 /// being deserialized. This can occur within DECLTYPES_BLOCK_ID.
 const unsigned int DECL_UPDATES = 49;
 
 /// Record code for a list of local redeclarations of a declaration.
 /// This can occur within DECLTYPES_BLOCK_ID.
 const unsigned int LOCAL_REDECLARATIONS = 50;
 
 /// Record codes for each kind of declaration.
 ///
 /// These constants describe the declaration records that can occur within
 /// a declarations block (identified by DECLTYPES_BLOCK_ID). Each
 /// constant describes a record for a specific declaration class
 /// in the AST. Note that TypeCode values share this code space.
 enum DeclCode {
   /// A TypedefDecl record.
   DECL_TYPEDEF = 51,
   /// A TypeAliasDecl record.
 
   DECL_TYPEALIAS,
 
   /// An EnumDecl record.
   DECL_ENUM,
 
   /// A RecordDecl record.
   DECL_RECORD,
 
   /// An EnumConstantDecl record.
   DECL_ENUM_CONSTANT,
 
   /// A FunctionDecl record.
   DECL_FUNCTION,
 
   /// A ObjCMethodDecl record.
   DECL_OBJC_METHOD,
 
   /// A ObjCInterfaceDecl record.
   DECL_OBJC_INTERFACE,
 
   /// A ObjCProtocolDecl record.
   DECL_OBJC_PROTOCOL,
 
   /// A ObjCIvarDecl record.
   DECL_OBJC_IVAR,
 
   /// A ObjCAtDefsFieldDecl record.
   DECL_OBJC_AT_DEFS_FIELD,
 
   /// A ObjCCategoryDecl record.
   DECL_OBJC_CATEGORY,
 
   /// A ObjCCategoryImplDecl record.
   DECL_OBJC_CATEGORY_IMPL,
 
   /// A ObjCImplementationDecl record.
   DECL_OBJC_IMPLEMENTATION,
 
   /// A ObjCCompatibleAliasDecl record.
   DECL_OBJC_COMPATIBLE_ALIAS,
 
   /// A ObjCPropertyDecl record.
   DECL_OBJC_PROPERTY,
 
   /// A ObjCPropertyImplDecl record.
   DECL_OBJC_PROPERTY_IMPL,
 
   /// A FieldDecl record.
   DECL_FIELD,
 
   /// A MSPropertyDecl record.
   DECL_MS_PROPERTY,
 
   /// A MSGuidDecl record.
   DECL_MS_GUID,
 
   /// A TemplateParamObjectDecl record.
   DECL_TEMPLATE_PARAM_OBJECT,
 
   /// A VarDecl record.
   DECL_VAR,
 
   /// An ImplicitParamDecl record.
   DECL_IMPLICIT_PARAM,
 
   /// A ParmVarDecl record.
   DECL_PARM_VAR,
 
   /// A DecompositionDecl record.
   DECL_DECOMPOSITION,
 
   /// A BindingDecl record.
   DECL_BINDING,
 
   /// A FileScopeAsmDecl record.
   DECL_FILE_SCOPE_ASM,
 
   /// A TopLevelStmtDecl record.
   DECL_TOP_LEVEL_STMT_DECL,
 
   /// A BlockDecl record.
   DECL_BLOCK,
 
   /// A OutlinedFunctionDecl record.
   DECL_OUTLINEDFUNCTION,
 
   /// A CapturedDecl record.
   DECL_CAPTURED,
 
   /// A record that stores the set of declarations that are
   /// lexically stored within a given DeclContext.
   ///
   /// The record itself is a blob that is an array of declaration IDs,
   /// in the order in which those declarations were added to the
   /// declaration context. This data is used when iterating over
   /// the contents of a DeclContext, e.g., via
   /// DeclContext::decls_begin() and DeclContext::decls_end().
   DECL_CONTEXT_LEXICAL,
 
   /// A record that stores the set of declarations that are
   /// visible from a given DeclContext.
   ///
   /// The record itself stores a set of mappings, each of which
   /// associates a declaration name with one or more declaration
   /// IDs. This data is used when performing qualified name lookup
   /// into a DeclContext via DeclContext::lookup.
   DECL_CONTEXT_VISIBLE,
 
   /// A record containing the set of declarations that are
   /// only visible from DeclContext in the same module.
   DECL_CONTEXT_MODULE_LOCAL_VISIBLE,
 
   /// A record that stores the set of declarations that are only visible
   /// to the TU.
   DECL_CONTEXT_TU_LOCAL_VISIBLE,
 
   /// A LabelDecl record.
   DECL_LABEL,
 
   /// A NamespaceDecl record.
   DECL_NAMESPACE,
 
   /// A NamespaceAliasDecl record.
   DECL_NAMESPACE_ALIAS,
 
   /// A UsingDecl record.
   DECL_USING,
 
   /// A UsingEnumDecl record.
   DECL_USING_ENUM,
 
   /// A UsingPackDecl record.
   DECL_USING_PACK,
 
   /// A UsingShadowDecl record.
   DECL_USING_SHADOW,
 
   /// A ConstructorUsingShadowDecl record.
   DECL_CONSTRUCTOR_USING_SHADOW,
 
   /// A UsingDirecitveDecl record.
   DECL_USING_DIRECTIVE,
 
   /// An UnresolvedUsingValueDecl record.
   DECL_UNRESOLVED_USING_VALUE,
 
   /// An UnresolvedUsingTypenameDecl record.
   DECL_UNRESOLVED_USING_TYPENAME,
 
   /// A LinkageSpecDecl record.
   DECL_LINKAGE_SPEC,
 
   /// An ExportDecl record.
   DECL_EXPORT,
 
   /// A CXXRecordDecl record.
   DECL_CXX_RECORD,
 
   /// A CXXDeductionGuideDecl record.
   DECL_CXX_DEDUCTION_GUIDE,
 
   /// A CXXMethodDecl record.
   DECL_CXX_METHOD,
 
   /// A CXXConstructorDecl record.
   DECL_CXX_CONSTRUCTOR,
 
   /// A CXXDestructorDecl record.
   DECL_CXX_DESTRUCTOR,
 
   /// A CXXConversionDecl record.
   DECL_CXX_CONVERSION,
 
   /// An AccessSpecDecl record.
   DECL_ACCESS_SPEC,
 
   /// A FriendDecl record.
   DECL_FRIEND,
 
   /// A FriendTemplateDecl record.
   DECL_FRIEND_TEMPLATE,
 
   /// A ClassTemplateDecl record.
   DECL_CLASS_TEMPLATE,
 
   /// A ClassTemplateSpecializationDecl record.
   DECL_CLASS_TEMPLATE_SPECIALIZATION,
 
   /// A ClassTemplatePartialSpecializationDecl record.
   DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION,
 
   /// A VarTemplateDecl record.
   DECL_VAR_TEMPLATE,
 
   /// A VarTemplateSpecializationDecl record.
   DECL_VAR_TEMPLATE_SPECIALIZATION,
 
   /// A VarTemplatePartialSpecializationDecl record.
   DECL_VAR_TEMPLATE_PARTIAL_SPECIALIZATION,
 
   /// A FunctionTemplateDecl record.
   DECL_FUNCTION_TEMPLATE,
 
   /// A TemplateTypeParmDecl record.
   DECL_TEMPLATE_TYPE_PARM,
 
   /// A NonTypeTemplateParmDecl record.
   DECL_NON_TYPE_TEMPLATE_PARM,
 
   /// A TemplateTemplateParmDecl record.
   DECL_TEMPLATE_TEMPLATE_PARM,
 
   /// A TypeAliasTemplateDecl record.
   DECL_TYPE_ALIAS_TEMPLATE,
 
   /// \brief A ConceptDecl record.
   DECL_CONCEPT,
 
   /// An UnresolvedUsingIfExistsDecl record.
   DECL_UNRESOLVED_USING_IF_EXISTS,
 
   /// \brief A StaticAssertDecl record.
   DECL_STATIC_ASSERT,
 
   /// A record containing CXXBaseSpecifiers.
   DECL_CXX_BASE_SPECIFIERS,
 
   /// A record containing CXXCtorInitializers.
   DECL_CXX_CTOR_INITIALIZERS,
 
   /// A IndirectFieldDecl record.
   DECL_INDIRECTFIELD,
 
   /// A NonTypeTemplateParmDecl record that stores an expanded
   /// non-type template parameter pack.
   DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK,
 
   /// A TemplateTemplateParmDecl record that stores an expanded
   /// template template parameter pack.
   DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK,
 
   /// An ImportDecl recording a module import.
   DECL_IMPORT,
 
   /// An OMPThreadPrivateDecl record.
   DECL_OMP_THREADPRIVATE,
 
   /// An OMPRequiresDecl record.
   DECL_OMP_REQUIRES,
 
   /// An OMPAllocateDcl record.
   DECL_OMP_ALLOCATE,
 
   /// An EmptyDecl record.
   DECL_EMPTY,
 
   /// An LifetimeExtendedTemporaryDecl record.
   DECL_LIFETIME_EXTENDED_TEMPORARY,
 
   /// A RequiresExprBodyDecl record.
   DECL_REQUIRES_EXPR_BODY,
 
   /// An ObjCTypeParamDecl record.
   DECL_OBJC_TYPE_PARAM,
 
   /// An OMPCapturedExprDecl record.
   DECL_OMP_CAPTUREDEXPR,
 
   /// A PragmaCommentDecl record.
   DECL_PRAGMA_COMMENT,
 
   /// A PragmaDetectMismatchDecl record.
   DECL_PRAGMA_DETECT_MISMATCH,
 
   /// An OMPDeclareMapperDecl record.
   DECL_OMP_DECLARE_MAPPER,
 
   /// An OMPDeclareReductionDecl record.
   DECL_OMP_DECLARE_REDUCTION,
 
   /// A UnnamedGlobalConstantDecl record.
   DECL_UNNAMED_GLOBAL_CONSTANT,
 
   /// A HLSLBufferDecl record.
   DECL_HLSL_BUFFER,
 
   /// An ImplicitConceptSpecializationDecl record.
   DECL_IMPLICIT_CONCEPT_SPECIALIZATION,
 
   // A decls specialization record.
   DECL_SPECIALIZATIONS,
 
   // A decls specialization record.
   DECL_PARTIAL_SPECIALIZATIONS,
 
   DECL_LAST = DECL_PARTIAL_SPECIALIZATIONS
 };
 
 /// Record codes for each kind of statement or expression.
 ///
 /// These constants describe the records that describe statements
 /// or expressions. These records  occur within type and declarations
 /// block, so they begin with record values of 128.  Each constant
 /// describes a record for a specific statement or expression class in the
 /// AST.
 enum StmtCode {
   /// A marker record that indicates that we are at the end
   /// of an expression.
   STMT_STOP = DECL_LAST + 1,
 
   /// A NULL expression.
   STMT_NULL_PTR,
 
   /// A reference to a previously [de]serialized Stmt record.
   STMT_REF_PTR,
 
   /// A NullStmt record.
   STMT_NULL,
 
   /// A CompoundStmt record.
   STMT_COMPOUND,
 
   /// A CaseStmt record.
   STMT_CASE,
 
   /// A DefaultStmt record.
   STMT_DEFAULT,
 
   /// A LabelStmt record.
   STMT_LABEL,
 
   /// An AttributedStmt record.
   STMT_ATTRIBUTED,
 
   /// An IfStmt record.
   STMT_IF,
 
   /// A SwitchStmt record.
   STMT_SWITCH,
 
   /// A WhileStmt record.
   STMT_WHILE,
 
   /// A DoStmt record.
   STMT_DO,
 
   /// A ForStmt record.
   STMT_FOR,
 
   /// A GotoStmt record.
   STMT_GOTO,
 
   /// An IndirectGotoStmt record.
   STMT_INDIRECT_GOTO,
 
   /// A ContinueStmt record.
   STMT_CONTINUE,
 
   /// A BreakStmt record.
   STMT_BREAK,
 
   /// A ReturnStmt record.
   STMT_RETURN,
 
   /// A DeclStmt record.
   STMT_DECL,
 
   /// A CapturedStmt record.
   STMT_CAPTURED,
 
   /// A SYCLKernelCallStmt record.
   STMT_SYCLKERNELCALL,
 
   /// A GCC-style AsmStmt record.
   STMT_GCCASM,
 
   /// A MS-style AsmStmt record.
   STMT_MSASM,
 
   /// A constant expression context.
   EXPR_CONSTANT,
 
   /// A PredefinedExpr record.
   EXPR_PREDEFINED,
 
   /// A DeclRefExpr record.
   EXPR_DECL_REF,
 
   /// An IntegerLiteral record.
   EXPR_INTEGER_LITERAL,
 
   /// A FloatingLiteral record.
   EXPR_FLOATING_LITERAL,
 
   /// An ImaginaryLiteral record.
   EXPR_IMAGINARY_LITERAL,
 
   /// A StringLiteral record.
   EXPR_STRING_LITERAL,
 
   /// A CharacterLiteral record.
   EXPR_CHARACTER_LITERAL,
 
   /// A ParenExpr record.
   EXPR_PAREN,
 
   /// A ParenListExpr record.
   EXPR_PAREN_LIST,
 
   /// A UnaryOperator record.
   EXPR_UNARY_OPERATOR,
 
   /// An OffsetOfExpr record.
   EXPR_OFFSETOF,
 
   /// A SizefAlignOfExpr record.
   EXPR_SIZEOF_ALIGN_OF,
 
   /// An ArraySubscriptExpr record.
   EXPR_ARRAY_SUBSCRIPT,
 
   /// An MatrixSubscriptExpr record.
   EXPR_MATRIX_SUBSCRIPT,
 
   /// A CallExpr record.
   EXPR_CALL,
 
   /// A MemberExpr record.
   EXPR_MEMBER,
 
   /// A BinaryOperator record.
   EXPR_BINARY_OPERATOR,
 
   /// A CompoundAssignOperator record.
   EXPR_COMPOUND_ASSIGN_OPERATOR,
 
   /// A ConditionOperator record.
   EXPR_CONDITIONAL_OPERATOR,
 
   /// An ImplicitCastExpr record.
   EXPR_IMPLICIT_CAST,
 
   /// A CStyleCastExpr record.
   EXPR_CSTYLE_CAST,
 
   /// A CompoundLiteralExpr record.
   EXPR_COMPOUND_LITERAL,
 
   /// An ExtVectorElementExpr record.
   EXPR_EXT_VECTOR_ELEMENT,
 
   /// An InitListExpr record.
   EXPR_INIT_LIST,
 
   /// A DesignatedInitExpr record.
   EXPR_DESIGNATED_INIT,
 
   /// A DesignatedInitUpdateExpr record.
   EXPR_DESIGNATED_INIT_UPDATE,
 
   /// An NoInitExpr record.
   EXPR_NO_INIT,
 
   /// An ArrayInitLoopExpr record.
   EXPR_ARRAY_INIT_LOOP,
 
   /// An ArrayInitIndexExpr record.
   EXPR_ARRAY_INIT_INDEX,
 
   /// An ImplicitValueInitExpr record.
   EXPR_IMPLICIT_VALUE_INIT,
 
   /// A VAArgExpr record.
   EXPR_VA_ARG,
 
   /// An AddrLabelExpr record.
   EXPR_ADDR_LABEL,
 
   /// A StmtExpr record.
   EXPR_STMT,
 
   /// A ChooseExpr record.
   EXPR_CHOOSE,
 
   /// A GNUNullExpr record.
   EXPR_GNU_NULL,
 
   /// A SourceLocExpr record.
   EXPR_SOURCE_LOC,
 
   /// A EmbedExpr record.
   EXPR_BUILTIN_PP_EMBED,
 
   /// A ShuffleVectorExpr record.
   EXPR_SHUFFLE_VECTOR,
 
   /// A ConvertVectorExpr record.
   EXPR_CONVERT_VECTOR,
 
   /// BlockExpr
   EXPR_BLOCK,
 
   /// A GenericSelectionExpr record.
   EXPR_GENERIC_SELECTION,
 
   /// A PseudoObjectExpr record.
   EXPR_PSEUDO_OBJECT,
 
   /// An AtomicExpr record.
   EXPR_ATOMIC,
 
   /// A RecoveryExpr record.
   EXPR_RECOVERY,
 
   // Objective-C
 
   /// An ObjCStringLiteral record.
   EXPR_OBJC_STRING_LITERAL,
 
   EXPR_OBJC_BOXED_EXPRESSION,
   EXPR_OBJC_ARRAY_LITERAL,
   EXPR_OBJC_DICTIONARY_LITERAL,
 
   /// An ObjCEncodeExpr record.
   EXPR_OBJC_ENCODE,
 
   /// An ObjCSelectorExpr record.
   EXPR_OBJC_SELECTOR_EXPR,
 
   /// An ObjCProtocolExpr record.
   EXPR_OBJC_PROTOCOL_EXPR,
 
   /// An ObjCIvarRefExpr record.
   EXPR_OBJC_IVAR_REF_EXPR,
 
   /// An ObjCPropertyRefExpr record.
   EXPR_OBJC_PROPERTY_REF_EXPR,
 
   /// An ObjCSubscriptRefExpr record.
   EXPR_OBJC_SUBSCRIPT_REF_EXPR,
 
   /// UNUSED
   EXPR_OBJC_KVC_REF_EXPR,
 
   /// An ObjCMessageExpr record.
   EXPR_OBJC_MESSAGE_EXPR,
 
   /// An ObjCIsa Expr record.
   EXPR_OBJC_ISA,
 
   /// An ObjCIndirectCopyRestoreExpr record.
   EXPR_OBJC_INDIRECT_COPY_RESTORE,
 
   /// An ObjCForCollectionStmt record.
   STMT_OBJC_FOR_COLLECTION,
 
   /// An ObjCAtCatchStmt record.
   STMT_OBJC_CATCH,
 
   /// An ObjCAtFinallyStmt record.
   STMT_OBJC_FINALLY,
 
   /// An ObjCAtTryStmt record.
   STMT_OBJC_AT_TRY,
 
   /// An ObjCAtSynchronizedStmt record.
   STMT_OBJC_AT_SYNCHRONIZED,
 
   /// An ObjCAtThrowStmt record.
   STMT_OBJC_AT_THROW,
 
   /// An ObjCAutoreleasePoolStmt record.
   STMT_OBJC_AUTORELEASE_POOL,
 
   /// An ObjCBoolLiteralExpr record.
   EXPR_OBJC_BOOL_LITERAL,
 
   /// An ObjCAvailabilityCheckExpr record.
   EXPR_OBJC_AVAILABILITY_CHECK,
 
   // C++
 
   /// A CXXCatchStmt record.
   STMT_CXX_CATCH,
 
   /// A CXXTryStmt record.
   STMT_CXX_TRY,
   /// A CXXForRangeStmt record.
 
   STMT_CXX_FOR_RANGE,
 
   /// A CXXOperatorCallExpr record.
   EXPR_CXX_OPERATOR_CALL,
 
   /// A CXXMemberCallExpr record.
   EXPR_CXX_MEMBER_CALL,
 
   /// A CXXRewrittenBinaryOperator record.
   EXPR_CXX_REWRITTEN_BINARY_OPERATOR,
 
   /// A CXXConstructExpr record.
   EXPR_CXX_CONSTRUCT,
 
   /// A CXXInheritedCtorInitExpr record.
   EXPR_CXX_INHERITED_CTOR_INIT,
 
   /// A CXXTemporaryObjectExpr record.
   EXPR_CXX_TEMPORARY_OBJECT,
 
   /// A CXXStaticCastExpr record.
   EXPR_CXX_STATIC_CAST,
 
   /// A CXXDynamicCastExpr record.
   EXPR_CXX_DYNAMIC_CAST,
 
   /// A CXXReinterpretCastExpr record.
   EXPR_CXX_REINTERPRET_CAST,
 
   /// A CXXConstCastExpr record.
   EXPR_CXX_CONST_CAST,
 
   /// A CXXAddrspaceCastExpr record.
   EXPR_CXX_ADDRSPACE_CAST,
 
   /// A CXXFunctionalCastExpr record.
   EXPR_CXX_FUNCTIONAL_CAST,
 
   /// A BuiltinBitCastExpr record.
   EXPR_BUILTIN_BIT_CAST,
 
   /// A UserDefinedLiteral record.
   EXPR_USER_DEFINED_LITERAL,
 
   /// A CXXStdInitializerListExpr record.
   EXPR_CXX_STD_INITIALIZER_LIST,
 
   /// A CXXBoolLiteralExpr record.
   EXPR_CXX_BOOL_LITERAL,
 
   /// A CXXParenListInitExpr record.
   EXPR_CXX_PAREN_LIST_INIT,
 
   EXPR_CXX_NULL_PTR_LITERAL, // CXXNullPtrLiteralExpr
   EXPR_CXX_TYPEID_EXPR,      // CXXTypeidExpr (of expr).
   EXPR_CXX_TYPEID_TYPE,      // CXXTypeidExpr (of type).
   EXPR_CXX_THIS,             // CXXThisExpr
   EXPR_CXX_THROW,            // CXXThrowExpr
   EXPR_CXX_DEFAULT_ARG,      // CXXDefaultArgExpr
   EXPR_CXX_DEFAULT_INIT,     // CXXDefaultInitExpr
   EXPR_CXX_BIND_TEMPORARY,   // CXXBindTemporaryExpr
 
   EXPR_CXX_SCALAR_VALUE_INIT, // CXXScalarValueInitExpr
   EXPR_CXX_NEW,               // CXXNewExpr
   EXPR_CXX_DELETE,            // CXXDeleteExpr
   EXPR_CXX_PSEUDO_DESTRUCTOR, // CXXPseudoDestructorExpr
 
   EXPR_EXPR_WITH_CLEANUPS, // ExprWithCleanups
 
   EXPR_CXX_DEPENDENT_SCOPE_MEMBER,   // CXXDependentScopeMemberExpr
   EXPR_CXX_DEPENDENT_SCOPE_DECL_REF, // DependentScopeDeclRefExpr
   EXPR_CXX_UNRESOLVED_CONSTRUCT,     // CXXUnresolvedConstructExpr
   EXPR_CXX_UNRESOLVED_MEMBER,        // UnresolvedMemberExpr
   EXPR_CXX_UNRESOLVED_LOOKUP,        // UnresolvedLookupExpr
 
   EXPR_CXX_EXPRESSION_TRAIT, // ExpressionTraitExpr
   EXPR_CXX_NOEXCEPT,         // CXXNoexceptExpr
 
   EXPR_OPAQUE_VALUE,                // OpaqueValueExpr
   EXPR_BINARY_CONDITIONAL_OPERATOR, // BinaryConditionalOperator
   EXPR_TYPE_TRAIT,                  // TypeTraitExpr
   EXPR_ARRAY_TYPE_TRAIT,            // ArrayTypeTraitIntExpr
 
   EXPR_PACK_EXPANSION,                    // PackExpansionExpr
   EXPR_PACK_INDEXING,                     // PackIndexingExpr
   EXPR_SIZEOF_PACK,                       // SizeOfPackExpr
   EXPR_SUBST_NON_TYPE_TEMPLATE_PARM,      // SubstNonTypeTemplateParmExpr
   EXPR_SUBST_NON_TYPE_TEMPLATE_PARM_PACK, // SubstNonTypeTemplateParmPackExpr
   EXPR_FUNCTION_PARM_PACK,                // FunctionParmPackExpr
   EXPR_MATERIALIZE_TEMPORARY,             // MaterializeTemporaryExpr
   EXPR_CXX_FOLD,                          // CXXFoldExpr
   EXPR_CONCEPT_SPECIALIZATION,            // ConceptSpecializationExpr
   EXPR_REQUIRES,                          // RequiresExpr
 
   // CUDA
   EXPR_CUDA_KERNEL_CALL, // CUDAKernelCallExpr
 
   // OpenCL
   EXPR_ASTYPE, // AsTypeExpr
 
   // Microsoft
   EXPR_CXX_PROPERTY_REF_EXPR,       // MSPropertyRefExpr
   EXPR_CXX_PROPERTY_SUBSCRIPT_EXPR, // MSPropertySubscriptExpr
   EXPR_CXX_UUIDOF_EXPR,             // CXXUuidofExpr (of expr).
   EXPR_CXX_UUIDOF_TYPE,             // CXXUuidofExpr (of type).
   STMT_SEH_LEAVE,                   // SEHLeaveStmt
   STMT_SEH_EXCEPT,                  // SEHExceptStmt
   STMT_SEH_FINALLY,                 // SEHFinallyStmt
   STMT_SEH_TRY,                     // SEHTryStmt
 
   // OpenMP directives
   STMT_OMP_META_DIRECTIVE,
   STMT_OMP_CANONICAL_LOOP,
   STMT_OMP_PARALLEL_DIRECTIVE,
   STMT_OMP_SIMD_DIRECTIVE,
   STMT_OMP_TILE_DIRECTIVE,
   STMT_OMP_UNROLL_DIRECTIVE,
   STMT_OMP_REVERSE_DIRECTIVE,
   STMT_OMP_INTERCHANGE_DIRECTIVE,
   STMT_OMP_FOR_DIRECTIVE,
   STMT_OMP_FOR_SIMD_DIRECTIVE,
   STMT_OMP_SECTIONS_DIRECTIVE,
   STMT_OMP_SECTION_DIRECTIVE,
   STMT_OMP_SINGLE_DIRECTIVE,
   STMT_OMP_MASTER_DIRECTIVE,
   STMT_OMP_CRITICAL_DIRECTIVE,
   STMT_OMP_PARALLEL_FOR_DIRECTIVE,
   STMT_OMP_PARALLEL_FOR_SIMD_DIRECTIVE,
   STMT_OMP_PARALLEL_MASTER_DIRECTIVE,
   STMT_OMP_PARALLEL_MASKED_DIRECTIVE,
   STMT_OMP_PARALLEL_SECTIONS_DIRECTIVE,
   STMT_OMP_TASK_DIRECTIVE,
   STMT_OMP_TASKYIELD_DIRECTIVE,
   STMT_OMP_ERROR_DIRECTIVE,
   STMT_OMP_BARRIER_DIRECTIVE,
   STMT_OMP_TASKWAIT_DIRECTIVE,
   STMT_OMP_FLUSH_DIRECTIVE,
   STMT_OMP_DEPOBJ_DIRECTIVE,
   STMT_OMP_SCAN_DIRECTIVE,
   STMT_OMP_ORDERED_DIRECTIVE,
   STMT_OMP_ATOMIC_DIRECTIVE,
   STMT_OMP_TARGET_DIRECTIVE,
   STMT_OMP_TARGET_DATA_DIRECTIVE,
   STMT_OMP_TARGET_ENTER_DATA_DIRECTIVE,
   STMT_OMP_TARGET_EXIT_DATA_DIRECTIVE,
   STMT_OMP_TARGET_PARALLEL_DIRECTIVE,
   STMT_OMP_TARGET_PARALLEL_FOR_DIRECTIVE,
   STMT_OMP_TEAMS_DIRECTIVE,
   STMT_OMP_TASKGROUP_DIRECTIVE,
   STMT_OMP_CANCELLATION_POINT_DIRECTIVE,
   STMT_OMP_CANCEL_DIRECTIVE,
   STMT_OMP_TASKLOOP_DIRECTIVE,
   STMT_OMP_TASKLOOP_SIMD_DIRECTIVE,
   STMT_OMP_MASTER_TASKLOOP_DIRECTIVE,
   STMT_OMP_MASTER_TASKLOOP_SIMD_DIRECTIVE,
   STMT_OMP_PARALLEL_MASTER_TASKLOOP_DIRECTIVE,
   STMT_OMP_PARALLEL_MASTER_TASKLOOP_SIMD_DIRECTIVE,
   STMT_OMP_MASKED_TASKLOOP_DIRECTIVE,
   STMT_OMP_MASKED_TASKLOOP_SIMD_DIRECTIVE,
   STMT_OMP_PARALLEL_MASKED_TASKLOOP_DIRECTIVE,
   STMT_OMP_PARALLEL_MASKED_TASKLOOP_SIMD_DIRECTIVE,
   STMT_OMP_DISTRIBUTE_DIRECTIVE,
   STMT_OMP_TARGET_UPDATE_DIRECTIVE,
   STMT_OMP_DISTRIBUTE_PARALLEL_FOR_DIRECTIVE,
   STMT_OMP_DISTRIBUTE_PARALLEL_FOR_SIMD_DIRECTIVE,
   STMT_OMP_DISTRIBUTE_SIMD_DIRECTIVE,
   STMT_OMP_TARGET_PARALLEL_FOR_SIMD_DIRECTIVE,
   STMT_OMP_TARGET_SIMD_DIRECTIVE,
   STMT_OMP_TEAMS_DISTRIBUTE_DIRECTIVE,
   STMT_OMP_TEAMS_DISTRIBUTE_SIMD_DIRECTIVE,
   STMT_OMP_TEAMS_DISTRIBUTE_PARALLEL_FOR_SIMD_DIRECTIVE,
   STMT_OMP_TEAMS_DISTRIBUTE_PARALLEL_FOR_DIRECTIVE,
   STMT_OMP_TARGET_TEAMS_DIRECTIVE,
   STMT_OMP_TARGET_TEAMS_DISTRIBUTE_DIRECTIVE,
   STMT_OMP_TARGET_TEAMS_DISTRIBUTE_PARALLEL_FOR_DIRECTIVE,
   STMT_OMP_TARGET_TEAMS_DISTRIBUTE_PARALLEL_FOR_SIMD_DIRECTIVE,
   STMT_OMP_TARGET_TEAMS_DISTRIBUTE_SIMD_DIRECTIVE,
   STMT_OMP_SCOPE_DIRECTIVE,
   STMT_OMP_INTEROP_DIRECTIVE,
   STMT_OMP_DISPATCH_DIRECTIVE,
   STMT_OMP_MASKED_DIRECTIVE,
   STMT_OMP_GENERIC_LOOP_DIRECTIVE,
   STMT_OMP_TEAMS_GENERIC_LOOP_DIRECTIVE,
   STMT_OMP_TARGET_TEAMS_GENERIC_LOOP_DIRECTIVE,
   STMT_OMP_PARALLEL_GENERIC_LOOP_DIRECTIVE,
   STMT_OMP_TARGET_PARALLEL_GENERIC_LOOP_DIRECTIVE,
   STMT_OMP_ASSUME_DIRECTIVE,
   EXPR_ARRAY_SECTION,
   EXPR_OMP_ARRAY_SHAPING,
   EXPR_OMP_ITERATOR,
 
   // ARC
   EXPR_OBJC_BRIDGED_CAST, // ObjCBridgedCastExpr
 
   STMT_MS_DEPENDENT_EXISTS, // MSDependentExistsStmt
   EXPR_LAMBDA,              // LambdaExpr
   STMT_COROUTINE_BODY,
   STMT_CORETURN,
   EXPR_COAWAIT,
   EXPR_COYIELD,
   EXPR_DEPENDENT_COAWAIT,
 
   // FixedPointLiteral
   EXPR_FIXEDPOINT_LITERAL,
 
   // SYCLUniqueStableNameExpr
   EXPR_SYCL_UNIQUE_STABLE_NAME,
 
   // OpenACC Constructs/Exprs
   STMT_OPENACC_COMPUTE_CONSTRUCT,
   STMT_OPENACC_LOOP_CONSTRUCT,
   STMT_OPENACC_COMBINED_CONSTRUCT,
   EXPR_OPENACC_ASTERISK_SIZE,
   STMT_OPENACC_DATA_CONSTRUCT,
   STMT_OPENACC_ENTER_DATA_CONSTRUCT,
   STMT_OPENACC_EXIT_DATA_CONSTRUCT,
   STMT_OPENACC_HOST_DATA_CONSTRUCT,
   STMT_OPENACC_WAIT_CONSTRUCT,
   STMT_OPENACC_INIT_CONSTRUCT,
   STMT_OPENACC_SHUTDOWN_CONSTRUCT,
   STMT_OPENACC_SET_CONSTRUCT,
   STMT_OPENACC_UPDATE_CONSTRUCT,
 
   // HLSL Constructs
   EXPR_HLSL_OUT_ARG,
 
 };
 
 /// The kinds of designators that can occur in a
 /// DesignatedInitExpr.
 enum DesignatorTypes {
   /// Field designator where only the field name is known.
   DESIG_FIELD_NAME = 0,
 
   /// Field designator where the field has been resolved to
   /// a declaration.
   DESIG_FIELD_DECL = 1,
 
   /// Array designator.
   DESIG_ARRAY = 2,
 
   /// GNU array range designator.
   DESIG_ARRAY_RANGE = 3
 };
 
 /// The different kinds of data that can occur in a
 /// CtorInitializer.
 enum CtorInitializerType {
   CTOR_INITIALIZER_BASE,
   CTOR_INITIALIZER_DELEGATING,
   CTOR_INITIALIZER_MEMBER,
   CTOR_INITIALIZER_INDIRECT_MEMBER
 };
 
 /// Kinds of cleanup objects owned by ExprWithCleanups.
 enum CleanupObjectKind { COK_Block, COK_CompoundLiteral };
 
 /// Describes the categories of an Objective-C class.
 struct ObjCCategoriesInfo {
   // The ID of the definition. Use unaligned_decl_id_t to keep
   // ObjCCategoriesInfo 32-bit aligned.
   unaligned_decl_id_t DefinitionID;
 
   // Offset into the array of category lists.
   unsigned Offset;
 
   ObjCCategoriesInfo() = default;
   ObjCCategoriesInfo(LocalDeclID ID, unsigned Offset)
       : DefinitionID(ID.getRawValue()), Offset(Offset) {}
 
   DeclID getDefinitionID() const { return DefinitionID; }
 
   friend bool operator<(const ObjCCategoriesInfo &X,
                         const ObjCCategoriesInfo &Y) {
     return X.getDefinitionID() < Y.getDefinitionID();
   }
 
   friend bool operator>(const ObjCCategoriesInfo &X,
                         const ObjCCategoriesInfo &Y) {
     return X.getDefinitionID() > Y.getDefinitionID();
   }
 
   friend bool operator<=(const ObjCCategoriesInfo &X,
                          const ObjCCategoriesInfo &Y) {
     return X.getDefinitionID() <= Y.getDefinitionID();
   }
 
   friend bool operator>=(const ObjCCategoriesInfo &X,
                          const ObjCCategoriesInfo &Y) {
     return X.getDefinitionID() >= Y.getDefinitionID();
   }
 };
 
 static_assert(alignof(ObjCCategoriesInfo) <= 4);
 static_assert(std::is_standard_layout_v<ObjCCategoriesInfo> &&
               std::is_trivial_v<ObjCCategoriesInfo>);
 
 /// A key used when looking up entities by \ref DeclarationName.
 ///
 /// Different \ref DeclarationNames are mapped to different keys, but the
 /// same key can occasionally represent multiple names (for names that
 /// contain types, in particular).
 class DeclarationNameKey {
   using NameKind = unsigned;
 
   NameKind Kind = 0;
   uint64_t Data = 0;
 
 public:
   DeclarationNameKey() = default;
   DeclarationNameKey(DeclarationName Name);
   DeclarationNameKey(NameKind Kind, uint64_t Data) : Kind(Kind), Data(Data) {}
 
   NameKind getKind() const { return Kind; }
 
   IdentifierInfo *getIdentifier() const {
     assert(Kind == DeclarationName::Identifier ||
            Kind == DeclarationName::CXXLiteralOperatorName ||
            Kind == DeclarationName::CXXDeductionGuideName);
     return (IdentifierInfo *)Data;
   }
 
   Selector getSelector() const {
     assert(Kind == DeclarationName::ObjCZeroArgSelector ||
            Kind == DeclarationName::ObjCOneArgSelector ||
            Kind == DeclarationName::ObjCMultiArgSelector);
     return Selector(Data);
   }
 
   OverloadedOperatorKind getOperatorKind() const {
     assert(Kind == DeclarationName::CXXOperatorName);
     return (OverloadedOperatorKind)Data;
   }
 
   /// Compute a fingerprint of this key for use in on-disk hash table.
   unsigned getHash() const;
 
   friend bool operator==(const DeclarationNameKey &A,
                          const DeclarationNameKey &B) {
     return A.Kind == B.Kind && A.Data == B.Data;
   }
 };
 
 /// @}
 
 } // namespace serialization
 } // namespace clang
 
 namespace llvm {
 
 template <> struct DenseMapInfo<clang::serialization::DeclarationNameKey> {
   static clang::serialization::DeclarationNameKey getEmptyKey() {
     return clang::serialization::DeclarationNameKey(-1, 1);
   }
 
   static clang::serialization::DeclarationNameKey getTombstoneKey() {
     return clang::serialization::DeclarationNameKey(-1, 2);
   }
 
   static unsigned
   getHashValue(const clang::serialization::DeclarationNameKey &Key) {
     return Key.getHash();
   }
 
   static bool isEqual(const clang::serialization::DeclarationNameKey &L,
                       const clang::serialization::DeclarationNameKey &R) {
     return L == R;
   }
 };
 
 } // namespace llvm
 
 #endif // LLVM_CLANG_SERIALIZATION_ASTBITCODES_H

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