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1 //===- ASTBitCodes.h - Enum values for the PCH bitcode format ---*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This header defines Bitcode enum values for Clang serialized AST files.
11 //
12 // The enum values defined in this file should be considered permanent.  If
13 // new features are added, they should have values added at the end of the
14 // respective lists.
15 //
16 //===----------------------------------------------------------------------===//
17 #ifndef LLVM_CLANG_SERIALIZATION_ASTBITCODES_H
18 #define LLVM_CLANG_SERIALIZATION_ASTBITCODES_H
19 
20 #include "clang/AST/Type.h"
21 #include "llvm/ADT/DenseMap.h"
22 #include "llvm/Bitcode/BitCodes.h"
23 #include "llvm/Support/DataTypes.h"
24 
25 namespace clang {
26   namespace serialization {
27     /// \brief AST file major version number supported by this version of
28     /// Clang.
29     ///
30     /// Whenever the AST file format changes in a way that makes it
31     /// incompatible with previous versions (such that a reader
32     /// designed for the previous version could not support reading
33     /// the new version), this number should be increased.
34     ///
35     /// Version 4 of AST files also requires that the version control branch and
36     /// revision match exactly, since there is no backward compatibility of
37     /// AST files at this time.
38     const unsigned VERSION_MAJOR = 6;
39 
40     /// \brief AST file minor version number supported by this version of
41     /// Clang.
42     ///
43     /// Whenever the AST format changes in a way that is still
44     /// compatible with previous versions (such that a reader designed
45     /// for the previous version could still support reading the new
46     /// version by ignoring new kinds of subblocks), this number
47     /// should be increased.
48     const unsigned VERSION_MINOR = 0;
49 
50     /// \brief An ID number that refers to an identifier in an AST file.
51     ///
52     /// The ID numbers of identifiers are consecutive (in order of discovery)
53     /// and start at 1. 0 is reserved for NULL.
54     typedef uint32_t IdentifierID;
55 
56     /// \brief An ID number that refers to a declaration in an AST file.
57     ///
58     /// The ID numbers of declarations are consecutive (in order of
59     /// discovery), with values below NUM_PREDEF_DECL_IDS being reserved.
60     /// At the start of a chain of precompiled headers, declaration ID 1 is
61     /// used for the translation unit declaration.
62     typedef uint32_t DeclID;
63 
64     /// \brief a Decl::Kind/DeclID pair.
65     typedef std::pair<uint32_t, DeclID> KindDeclIDPair;
66 
67     // FIXME: Turn these into classes so we can have some type safety when
68     // we go from local ID to global and vice-versa.
69     typedef DeclID LocalDeclID;
70     typedef DeclID GlobalDeclID;
71 
72     /// \brief An ID number that refers to a type in an AST file.
73     ///
74     /// The ID of a type is partitioned into two parts: the lower
75     /// three bits are used to store the const/volatile/restrict
76     /// qualifiers (as with QualType) and the upper bits provide a
77     /// type index. The type index values are partitioned into two
78     /// sets. The values below NUM_PREDEF_TYPE_IDs are predefined type
79     /// IDs (based on the PREDEF_TYPE_*_ID constants), with 0 as a
80     /// placeholder for "no type". Values from NUM_PREDEF_TYPE_IDs are
81     /// other types that have serialized representations.
82     typedef uint32_t TypeID;
83 
84     /// \brief A type index; the type ID with the qualifier bits removed.
85     class TypeIdx {
86       uint32_t Idx;
87     public:
TypeIdx()88       TypeIdx() : Idx(0) { }
TypeIdx(uint32_t index)89       explicit TypeIdx(uint32_t index) : Idx(index) { }
90 
getIndex()91       uint32_t getIndex() const { return Idx; }
asTypeID(unsigned FastQuals)92       TypeID asTypeID(unsigned FastQuals) const {
93         if (Idx == uint32_t(-1))
94           return TypeID(-1);
95 
96         return (Idx << Qualifiers::FastWidth) | FastQuals;
97       }
fromTypeID(TypeID ID)98       static TypeIdx fromTypeID(TypeID ID) {
99         if (ID == TypeID(-1))
100           return TypeIdx(-1);
101 
102         return TypeIdx(ID >> Qualifiers::FastWidth);
103       }
104     };
105 
106     /// A structure for putting "fast"-unqualified QualTypes into a
107     /// DenseMap.  This uses the standard pointer hash function.
108     struct UnsafeQualTypeDenseMapInfo {
isEqualUnsafeQualTypeDenseMapInfo109       static inline bool isEqual(QualType A, QualType B) { return A == B; }
getEmptyKeyUnsafeQualTypeDenseMapInfo110       static inline QualType getEmptyKey() {
111         return QualType::getFromOpaquePtr((void*) 1);
112       }
getTombstoneKeyUnsafeQualTypeDenseMapInfo113       static inline QualType getTombstoneKey() {
114         return QualType::getFromOpaquePtr((void*) 2);
115       }
getHashValueUnsafeQualTypeDenseMapInfo116       static inline unsigned getHashValue(QualType T) {
117         assert(!T.getLocalFastQualifiers() &&
118                "hash invalid for types with fast quals");
119         uintptr_t v = reinterpret_cast<uintptr_t>(T.getAsOpaquePtr());
120         return (unsigned(v) >> 4) ^ (unsigned(v) >> 9);
121       }
122     };
123 
124     /// \brief An ID number that refers to an identifier in an AST file.
125     typedef uint32_t IdentID;
126 
127     /// \brief The number of predefined identifier IDs.
128     const unsigned int NUM_PREDEF_IDENT_IDS = 1;
129 
130     /// \brief An ID number that refers to a macro in an AST file.
131     typedef uint32_t MacroID;
132 
133     /// \brief A global ID number that refers to a macro in an AST file.
134     typedef uint32_t GlobalMacroID;
135 
136     /// \brief A local to a module ID number that refers to a macro in an
137     /// AST file.
138     typedef uint32_t LocalMacroID;
139 
140     /// \brief The number of predefined macro IDs.
141     const unsigned int NUM_PREDEF_MACRO_IDS = 1;
142 
143     /// \brief An ID number that refers to an ObjC selector in an AST file.
144     typedef uint32_t SelectorID;
145 
146     /// \brief The number of predefined selector IDs.
147     const unsigned int NUM_PREDEF_SELECTOR_IDS = 1;
148 
149     /// \brief An ID number that refers to a set of CXXBaseSpecifiers in an
150     /// AST file.
151     typedef uint32_t CXXBaseSpecifiersID;
152 
153     /// \brief An ID number that refers to a list of CXXCtorInitializers in an
154     /// AST file.
155     typedef uint32_t CXXCtorInitializersID;
156 
157     /// \brief An ID number that refers to an entity in the detailed
158     /// preprocessing record.
159     typedef uint32_t PreprocessedEntityID;
160 
161     /// \brief An ID number that refers to a submodule in a module file.
162     typedef uint32_t SubmoduleID;
163 
164     /// \brief The number of predefined submodule IDs.
165     const unsigned int NUM_PREDEF_SUBMODULE_IDS = 1;
166 
167     /// \brief Source range/offset of a preprocessed entity.
168     struct PPEntityOffset {
169       /// \brief Raw source location of beginning of range.
170       unsigned Begin;
171       /// \brief Raw source location of end of range.
172       unsigned End;
173       /// \brief Offset in the AST file.
174       uint32_t BitOffset;
175 
PPEntityOffsetPPEntityOffset176       PPEntityOffset(SourceRange R, uint32_t BitOffset)
177         : Begin(R.getBegin().getRawEncoding()),
178           End(R.getEnd().getRawEncoding()),
179           BitOffset(BitOffset) { }
180     };
181 
182     /// \brief Source range/offset of a preprocessed entity.
183     struct DeclOffset {
184       /// \brief Raw source location.
185       unsigned Loc;
186       /// \brief Offset in the AST file.
187       uint32_t BitOffset;
188 
DeclOffsetDeclOffset189       DeclOffset() : Loc(0), BitOffset(0) { }
DeclOffsetDeclOffset190       DeclOffset(SourceLocation Loc, uint32_t BitOffset)
191         : Loc(Loc.getRawEncoding()),
192           BitOffset(BitOffset) { }
setLocationDeclOffset193       void setLocation(SourceLocation L) {
194         Loc = L.getRawEncoding();
195       }
196     };
197 
198     /// \brief The number of predefined preprocessed entity IDs.
199     const unsigned int NUM_PREDEF_PP_ENTITY_IDS = 1;
200 
201     /// \brief Describes the various kinds of blocks that occur within
202     /// an AST file.
203     enum BlockIDs {
204       /// \brief The AST block, which acts as a container around the
205       /// full AST block.
206       AST_BLOCK_ID = llvm::bitc::FIRST_APPLICATION_BLOCKID,
207 
208       /// \brief The block containing information about the source
209       /// manager.
210       SOURCE_MANAGER_BLOCK_ID,
211 
212       /// \brief The block containing information about the
213       /// preprocessor.
214       PREPROCESSOR_BLOCK_ID,
215 
216       /// \brief The block containing the definitions of all of the
217       /// types and decls used within the AST file.
218       DECLTYPES_BLOCK_ID,
219 
220       /// \brief The block containing the detailed preprocessing record.
221       PREPROCESSOR_DETAIL_BLOCK_ID,
222 
223       /// \brief The block containing the submodule structure.
224       SUBMODULE_BLOCK_ID,
225 
226       /// \brief The block containing comments.
227       COMMENTS_BLOCK_ID,
228 
229       /// \brief The control block, which contains all of the
230       /// information that needs to be validated prior to committing
231       /// to loading the AST file.
232       CONTROL_BLOCK_ID,
233 
234       /// \brief The block of input files, which were used as inputs
235       /// to create this AST file.
236       ///
237       /// This block is part of the control block.
238       INPUT_FILES_BLOCK_ID
239     };
240 
241     /// \brief Record types that occur within the control block.
242     enum ControlRecordTypes {
243       /// \brief AST file metadata, including the AST file version number
244       /// and information about the compiler used to build this AST file.
245       METADATA = 1,
246 
247       /// \brief Record code for the list of other AST files imported by
248       /// this AST file.
249       IMPORTS = 2,
250 
251       /// \brief Record code for the language options table.
252       ///
253       /// The record with this code contains the contents of the
254       /// LangOptions structure. We serialize the entire contents of
255       /// the structure, and let the reader decide which options are
256       /// actually important to check.
257       LANGUAGE_OPTIONS = 3,
258 
259       /// \brief Record code for the target options table.
260       TARGET_OPTIONS = 4,
261 
262       /// \brief Record code for the original file that was used to
263       /// generate the AST file, including both its file ID and its
264       /// name.
265       ORIGINAL_FILE = 5,
266 
267       /// \brief The directory that the PCH was originally created in.
268       ORIGINAL_PCH_DIR = 6,
269 
270       /// \brief Record code for file ID of the file or buffer that was used to
271       /// generate the AST file.
272       ORIGINAL_FILE_ID = 7,
273 
274       /// \brief Offsets into the input-files block where input files
275       /// reside.
276       INPUT_FILE_OFFSETS = 8,
277 
278       /// \brief Record code for the diagnostic options table.
279       DIAGNOSTIC_OPTIONS = 9,
280 
281       /// \brief Record code for the filesystem options table.
282       FILE_SYSTEM_OPTIONS = 10,
283 
284       /// \brief Record code for the headers search options table.
285       HEADER_SEARCH_OPTIONS = 11,
286 
287       /// \brief Record code for the preprocessor options table.
288       PREPROCESSOR_OPTIONS = 12,
289 
290       /// \brief Record code for the module name.
291       MODULE_NAME = 13,
292 
293       /// \brief Record code for the module map file that was used to build this
294       /// AST file.
295       MODULE_MAP_FILE = 14,
296 
297       /// \brief Record code for the signature that identifiers this AST file.
298       SIGNATURE = 15,
299 
300       /// \brief Record code for the module build directory.
301       MODULE_DIRECTORY = 16,
302 
303       /// \brief Record code for the list of other AST files made available by
304       /// this AST file but not actually used by it.
305       KNOWN_MODULE_FILES = 17,
306     };
307 
308     /// \brief Record types that occur within the input-files block
309     /// inside the control block.
310     enum InputFileRecordTypes {
311       /// \brief An input file.
312       INPUT_FILE = 1
313     };
314 
315     /// \brief Record types that occur within the AST block itself.
316     enum ASTRecordTypes {
317       /// \brief Record code for the offsets of each type.
318       ///
319       /// The TYPE_OFFSET constant describes the record that occurs
320       /// within the AST block. The record itself is an array of offsets that
321       /// point into the declarations and types block (identified by
322       /// DECLTYPES_BLOCK_ID). The index into the array is based on the ID
323       /// of a type. For a given type ID @c T, the lower three bits of
324       /// @c T are its qualifiers (const, volatile, restrict), as in
325       /// the QualType class. The upper bits, after being shifted and
326       /// subtracting NUM_PREDEF_TYPE_IDS, are used to index into the
327       /// TYPE_OFFSET block to determine the offset of that type's
328       /// corresponding record within the DECLTYPES_BLOCK_ID block.
329       TYPE_OFFSET = 1,
330 
331       /// \brief Record code for the offsets of each decl.
332       ///
333       /// The DECL_OFFSET constant describes the record that occurs
334       /// within the block identified by DECL_OFFSETS_BLOCK_ID within
335       /// the AST block. The record itself is an array of offsets that
336       /// point into the declarations and types block (identified by
337       /// DECLTYPES_BLOCK_ID). The declaration ID is an index into this
338       /// record, after subtracting one to account for the use of
339       /// declaration ID 0 for a NULL declaration pointer. Index 0 is
340       /// reserved for the translation unit declaration.
341       DECL_OFFSET = 2,
342 
343       /// \brief Record code for the table of offsets of each
344       /// identifier ID.
345       ///
346       /// The offset table contains offsets into the blob stored in
347       /// the IDENTIFIER_TABLE record. Each offset points to the
348       /// NULL-terminated string that corresponds to that identifier.
349       IDENTIFIER_OFFSET = 3,
350 
351       /// \brief This is so that older clang versions, before the introduction
352       /// of the control block, can read and reject the newer PCH format.
353       /// *DON"T CHANGE THIS NUMBER*.
354       METADATA_OLD_FORMAT = 4,
355 
356       /// \brief Record code for the identifier table.
357       ///
358       /// The identifier table is a simple blob that contains
359       /// NULL-terminated strings for all of the identifiers
360       /// referenced by the AST file. The IDENTIFIER_OFFSET table
361       /// contains the mapping from identifier IDs to the characters
362       /// in this blob. Note that the starting offsets of all of the
363       /// identifiers are odd, so that, when the identifier offset
364       /// table is loaded in, we can use the low bit to distinguish
365       /// between offsets (for unresolved identifier IDs) and
366       /// IdentifierInfo pointers (for already-resolved identifier
367       /// IDs).
368       IDENTIFIER_TABLE = 5,
369 
370       /// \brief Record code for the array of eagerly deserialized decls.
371       ///
372       /// The AST file contains a list of all of the declarations that should be
373       /// eagerly deserialized present within the parsed headers, stored as an
374       /// array of declaration IDs. These declarations will be
375       /// reported to the AST consumer after the AST file has been
376       /// read, since their presence can affect the semantics of the
377       /// program (e.g., for code generation).
378       EAGERLY_DESERIALIZED_DECLS = 6,
379 
380       /// \brief Record code for the set of non-builtin, special
381       /// types.
382       ///
383       /// This record contains the type IDs for the various type nodes
384       /// that are constructed during semantic analysis (e.g.,
385       /// __builtin_va_list). The SPECIAL_TYPE_* constants provide
386       /// offsets into this record.
387       SPECIAL_TYPES = 7,
388 
389       /// \brief Record code for the extra statistics we gather while
390       /// generating an AST file.
391       STATISTICS = 8,
392 
393       /// \brief Record code for the array of tentative definitions.
394       TENTATIVE_DEFINITIONS = 9,
395 
396       // ID 10 used to be for a list of extern "C" declarations.
397 
398       /// \brief Record code for the table of offsets into the
399       /// Objective-C method pool.
400       SELECTOR_OFFSETS = 11,
401 
402       /// \brief Record code for the Objective-C method pool,
403       METHOD_POOL = 12,
404 
405       /// \brief The value of the next __COUNTER__ to dispense.
406       /// [PP_COUNTER_VALUE, Val]
407       PP_COUNTER_VALUE = 13,
408 
409       /// \brief Record code for the table of offsets into the block
410       /// of source-location information.
411       SOURCE_LOCATION_OFFSETS = 14,
412 
413       /// \brief Record code for the set of source location entries
414       /// that need to be preloaded by the AST reader.
415       ///
416       /// This set contains the source location entry for the
417       /// predefines buffer and for any file entries that need to be
418       /// preloaded.
419       SOURCE_LOCATION_PRELOADS = 15,
420 
421       /// \brief Record code for the set of ext_vector type names.
422       EXT_VECTOR_DECLS = 16,
423 
424       /// \brief Record code for the array of unused file scoped decls.
425       UNUSED_FILESCOPED_DECLS = 17,
426 
427       /// \brief Record code for the table of offsets to entries in the
428       /// preprocessing record.
429       PPD_ENTITIES_OFFSETS = 18,
430 
431       /// \brief Record code for the array of VTable uses.
432       VTABLE_USES = 19,
433 
434       // ID 20 used to be for a list of dynamic classes.
435 
436       /// \brief Record code for referenced selector pool.
437       REFERENCED_SELECTOR_POOL = 21,
438 
439       /// \brief Record code for an update to the TU's lexically contained
440       /// declarations.
441       TU_UPDATE_LEXICAL = 22,
442 
443       /// \brief Record code for the array describing the locations (in the
444       /// LOCAL_REDECLARATIONS record) of the redeclaration chains, indexed by
445       /// the first known ID.
446       LOCAL_REDECLARATIONS_MAP = 23,
447 
448       /// \brief Record code for declarations that Sema keeps references of.
449       SEMA_DECL_REFS = 24,
450 
451       /// \brief Record code for weak undeclared identifiers.
452       WEAK_UNDECLARED_IDENTIFIERS = 25,
453 
454       /// \brief Record code for pending implicit instantiations.
455       PENDING_IMPLICIT_INSTANTIATIONS = 26,
456 
457       /// \brief Record code for a decl replacement block.
458       ///
459       /// If a declaration is modified after having been deserialized, and then
460       /// written to a dependent AST file, its ID and offset must be added to
461       /// the replacement block.
462       DECL_REPLACEMENTS = 27,
463 
464       /// \brief Record code for an update to a decl context's lookup table.
465       ///
466       /// In practice, this should only be used for the TU and namespaces.
467       UPDATE_VISIBLE = 28,
468 
469       /// \brief Record for offsets of DECL_UPDATES records for declarations
470       /// that were modified after being deserialized and need updates.
471       DECL_UPDATE_OFFSETS = 29,
472 
473       /// \brief Record of updates for a declaration that was modified after
474       /// being deserialized.
475       DECL_UPDATES = 30,
476 
477       /// \brief Record code for the table of offsets to CXXBaseSpecifier
478       /// sets.
479       CXX_BASE_SPECIFIER_OFFSETS = 31,
480 
481       /// \brief Record code for \#pragma diagnostic mappings.
482       DIAG_PRAGMA_MAPPINGS = 32,
483 
484       /// \brief Record code for special CUDA declarations.
485       CUDA_SPECIAL_DECL_REFS = 33,
486 
487       /// \brief Record code for header search information.
488       HEADER_SEARCH_TABLE = 34,
489 
490       /// \brief Record code for floating point \#pragma options.
491       FP_PRAGMA_OPTIONS = 35,
492 
493       /// \brief Record code for enabled OpenCL extensions.
494       OPENCL_EXTENSIONS = 36,
495 
496       /// \brief The list of delegating constructor declarations.
497       DELEGATING_CTORS = 37,
498 
499       /// \brief Record code for the set of known namespaces, which are used
500       /// for typo correction.
501       KNOWN_NAMESPACES = 38,
502 
503       /// \brief Record code for the remapping information used to relate
504       /// loaded modules to the various offsets and IDs(e.g., source location
505       /// offests, declaration and type IDs) that are used in that module to
506       /// refer to other modules.
507       MODULE_OFFSET_MAP = 39,
508 
509       /// \brief Record code for the source manager line table information,
510       /// which stores information about \#line directives.
511       SOURCE_MANAGER_LINE_TABLE = 40,
512 
513       /// \brief Record code for map of Objective-C class definition IDs to the
514       /// ObjC categories in a module that are attached to that class.
515       OBJC_CATEGORIES_MAP = 41,
516 
517       /// \brief Record code for a file sorted array of DeclIDs in a module.
518       FILE_SORTED_DECLS = 42,
519 
520       /// \brief Record code for an array of all of the (sub)modules that were
521       /// imported by the AST file.
522       IMPORTED_MODULES = 43,
523 
524       // ID 40 used to be a table of merged canonical declarations.
525 
526       /// \brief Record code for the array of redeclaration chains.
527       ///
528       /// This array can only be interpreted properly using the local
529       /// redeclarations map.
530       LOCAL_REDECLARATIONS = 45,
531 
532       /// \brief Record code for the array of Objective-C categories (including
533       /// extensions).
534       ///
535       /// This array can only be interpreted properly using the Objective-C
536       /// categories map.
537       OBJC_CATEGORIES = 46,
538 
539       /// \brief Record code for the table of offsets of each macro ID.
540       ///
541       /// The offset table contains offsets into the blob stored in
542       /// the preprocessor block. Each offset points to the corresponding
543       /// macro definition.
544       MACRO_OFFSET = 47,
545 
546       // ID 48 used to be a table of macros.
547 
548       /// \brief Record code for undefined but used functions and variables that
549       /// need a definition in this TU.
550       UNDEFINED_BUT_USED = 49,
551 
552       /// \brief Record code for late parsed template functions.
553       LATE_PARSED_TEMPLATE = 50,
554 
555       /// \brief Record code for \#pragma optimize options.
556       OPTIMIZE_PRAGMA_OPTIONS = 51,
557 
558       /// \brief Record code for potentially unused local typedef names.
559       UNUSED_LOCAL_TYPEDEF_NAME_CANDIDATES = 52,
560 
561       /// \brief Record code for the table of offsets to CXXCtorInitializers
562       /// lists.
563       CXX_CTOR_INITIALIZERS_OFFSETS = 53,
564     };
565 
566     /// \brief Record types used within a source manager block.
567     enum SourceManagerRecordTypes {
568       /// \brief Describes a source location entry (SLocEntry) for a
569       /// file.
570       SM_SLOC_FILE_ENTRY = 1,
571       /// \brief Describes a source location entry (SLocEntry) for a
572       /// buffer.
573       SM_SLOC_BUFFER_ENTRY = 2,
574       /// \brief Describes a blob that contains the data for a buffer
575       /// entry. This kind of record always directly follows a
576       /// SM_SLOC_BUFFER_ENTRY record or a SM_SLOC_FILE_ENTRY with an
577       /// overridden buffer.
578       SM_SLOC_BUFFER_BLOB = 3,
579       /// \brief Describes a source location entry (SLocEntry) for a
580       /// macro expansion.
581       SM_SLOC_EXPANSION_ENTRY = 4
582     };
583 
584     /// \brief Record types used within a preprocessor block.
585     enum PreprocessorRecordTypes {
586       // The macros in the PP section are a PP_MACRO_* instance followed by a
587       // list of PP_TOKEN instances for each token in the definition.
588 
589       /// \brief An object-like macro definition.
590       /// [PP_MACRO_OBJECT_LIKE, IdentInfoID, SLoc, IsUsed]
591       PP_MACRO_OBJECT_LIKE = 1,
592 
593       /// \brief A function-like macro definition.
594       /// [PP_MACRO_FUNCTION_LIKE, \<ObjectLikeStuff>, IsC99Varargs,
595       /// IsGNUVarars, NumArgs, ArgIdentInfoID* ]
596       PP_MACRO_FUNCTION_LIKE = 2,
597 
598       /// \brief Describes one token.
599       /// [PP_TOKEN, SLoc, Length, IdentInfoID, Kind, Flags]
600       PP_TOKEN = 3,
601 
602       /// \brief The macro directives history for a particular identifier.
603       PP_MACRO_DIRECTIVE_HISTORY = 4
604     };
605 
606     /// \brief Record types used within a preprocessor detail block.
607     enum PreprocessorDetailRecordTypes {
608       /// \brief Describes a macro expansion within the preprocessing record.
609       PPD_MACRO_EXPANSION = 0,
610 
611       /// \brief Describes a macro definition within the preprocessing record.
612       PPD_MACRO_DEFINITION = 1,
613 
614       /// \brief Describes an inclusion directive within the preprocessing
615       /// record.
616       PPD_INCLUSION_DIRECTIVE = 2
617     };
618 
619     /// \brief Record types used within a submodule description block.
620     enum SubmoduleRecordTypes {
621       /// \brief Metadata for submodules as a whole.
622       SUBMODULE_METADATA = 0,
623       /// \brief Defines the major attributes of a submodule, including its
624       /// name and parent.
625       SUBMODULE_DEFINITION = 1,
626       /// \brief Specifies the umbrella header used to create this module,
627       /// if any.
628       SUBMODULE_UMBRELLA_HEADER = 2,
629       /// \brief Specifies a header that falls into this (sub)module.
630       SUBMODULE_HEADER = 3,
631       /// \brief Specifies a top-level header that falls into this (sub)module.
632       SUBMODULE_TOPHEADER = 4,
633       /// \brief Specifies an umbrella directory.
634       SUBMODULE_UMBRELLA_DIR = 5,
635       /// \brief Specifies the submodules that are imported by this
636       /// submodule.
637       SUBMODULE_IMPORTS = 6,
638       /// \brief Specifies the submodules that are re-exported from this
639       /// submodule.
640       SUBMODULE_EXPORTS = 7,
641       /// \brief Specifies a required feature.
642       SUBMODULE_REQUIRES = 8,
643       /// \brief Specifies a header that has been explicitly excluded
644       /// from this submodule.
645       SUBMODULE_EXCLUDED_HEADER = 9,
646       /// \brief Specifies a library or framework to link against.
647       SUBMODULE_LINK_LIBRARY = 10,
648       /// \brief Specifies a configuration macro for this module.
649       SUBMODULE_CONFIG_MACRO = 11,
650       /// \brief Specifies a conflict with another module.
651       SUBMODULE_CONFLICT = 12,
652       /// \brief Specifies a header that is private to this submodule.
653       SUBMODULE_PRIVATE_HEADER = 13,
654       /// \brief Specifies a header that is part of the module but must be
655       /// textually included.
656       SUBMODULE_TEXTUAL_HEADER = 14,
657       /// \brief Specifies a header that is private to this submodule but
658       /// must be textually included.
659       SUBMODULE_PRIVATE_TEXTUAL_HEADER = 15,
660     };
661 
662     /// \brief Record types used within a comments block.
663     enum CommentRecordTypes {
664       COMMENTS_RAW_COMMENT = 0
665     };
666 
667     /// \defgroup ASTAST AST file AST constants
668     ///
669     /// The constants in this group describe various components of the
670     /// abstract syntax tree within an AST file.
671     ///
672     /// @{
673 
674     /// \brief Predefined type IDs.
675     ///
676     /// These type IDs correspond to predefined types in the AST
677     /// context, such as built-in types (int) and special place-holder
678     /// types (the \<overload> and \<dependent> type markers). Such
679     /// types are never actually serialized, since they will be built
680     /// by the AST context when it is created.
681     enum PredefinedTypeIDs {
682       /// \brief The NULL type.
683       PREDEF_TYPE_NULL_ID       = 0,
684       /// \brief The void type.
685       PREDEF_TYPE_VOID_ID       = 1,
686       /// \brief The 'bool' or '_Bool' type.
687       PREDEF_TYPE_BOOL_ID       = 2,
688       /// \brief The 'char' type, when it is unsigned.
689       PREDEF_TYPE_CHAR_U_ID     = 3,
690       /// \brief The 'unsigned char' type.
691       PREDEF_TYPE_UCHAR_ID      = 4,
692       /// \brief The 'unsigned short' type.
693       PREDEF_TYPE_USHORT_ID     = 5,
694       /// \brief The 'unsigned int' type.
695       PREDEF_TYPE_UINT_ID       = 6,
696       /// \brief The 'unsigned long' type.
697       PREDEF_TYPE_ULONG_ID      = 7,
698       /// \brief The 'unsigned long long' type.
699       PREDEF_TYPE_ULONGLONG_ID  = 8,
700       /// \brief The 'char' type, when it is signed.
701       PREDEF_TYPE_CHAR_S_ID     = 9,
702       /// \brief The 'signed char' type.
703       PREDEF_TYPE_SCHAR_ID      = 10,
704       /// \brief The C++ 'wchar_t' type.
705       PREDEF_TYPE_WCHAR_ID      = 11,
706       /// \brief The (signed) 'short' type.
707       PREDEF_TYPE_SHORT_ID      = 12,
708       /// \brief The (signed) 'int' type.
709       PREDEF_TYPE_INT_ID        = 13,
710       /// \brief The (signed) 'long' type.
711       PREDEF_TYPE_LONG_ID       = 14,
712       /// \brief The (signed) 'long long' type.
713       PREDEF_TYPE_LONGLONG_ID   = 15,
714       /// \brief The 'float' type.
715       PREDEF_TYPE_FLOAT_ID      = 16,
716       /// \brief The 'double' type.
717       PREDEF_TYPE_DOUBLE_ID     = 17,
718       /// \brief The 'long double' type.
719       PREDEF_TYPE_LONGDOUBLE_ID = 18,
720       /// \brief The placeholder type for overloaded function sets.
721       PREDEF_TYPE_OVERLOAD_ID   = 19,
722       /// \brief The placeholder type for dependent types.
723       PREDEF_TYPE_DEPENDENT_ID  = 20,
724       /// \brief The '__uint128_t' type.
725       PREDEF_TYPE_UINT128_ID    = 21,
726       /// \brief The '__int128_t' type.
727       PREDEF_TYPE_INT128_ID     = 22,
728       /// \brief The type of 'nullptr'.
729       PREDEF_TYPE_NULLPTR_ID    = 23,
730       /// \brief The C++ 'char16_t' type.
731       PREDEF_TYPE_CHAR16_ID     = 24,
732       /// \brief The C++ 'char32_t' type.
733       PREDEF_TYPE_CHAR32_ID     = 25,
734       /// \brief The ObjC 'id' type.
735       PREDEF_TYPE_OBJC_ID       = 26,
736       /// \brief The ObjC 'Class' type.
737       PREDEF_TYPE_OBJC_CLASS    = 27,
738       /// \brief The ObjC 'SEL' type.
739       PREDEF_TYPE_OBJC_SEL      = 28,
740       /// \brief The 'unknown any' placeholder type.
741       PREDEF_TYPE_UNKNOWN_ANY   = 29,
742       /// \brief The placeholder type for bound member functions.
743       PREDEF_TYPE_BOUND_MEMBER  = 30,
744       /// \brief The "auto" deduction type.
745       PREDEF_TYPE_AUTO_DEDUCT   = 31,
746       /// \brief The "auto &&" deduction type.
747       PREDEF_TYPE_AUTO_RREF_DEDUCT = 32,
748       /// \brief The OpenCL 'half' / ARM NEON __fp16 type.
749       PREDEF_TYPE_HALF_ID       = 33,
750       /// \brief ARC's unbridged-cast placeholder type.
751       PREDEF_TYPE_ARC_UNBRIDGED_CAST = 34,
752       /// \brief The pseudo-object placeholder type.
753       PREDEF_TYPE_PSEUDO_OBJECT = 35,
754       /// \brief The __va_list_tag placeholder type.
755       PREDEF_TYPE_VA_LIST_TAG = 36,
756       /// \brief The placeholder type for builtin functions.
757       PREDEF_TYPE_BUILTIN_FN = 37,
758       /// \brief OpenCL 1d image type.
759       PREDEF_TYPE_IMAGE1D_ID    = 38,
760       /// \brief OpenCL 1d image array type.
761       PREDEF_TYPE_IMAGE1D_ARR_ID = 39,
762       /// \brief OpenCL 1d image buffer type.
763       PREDEF_TYPE_IMAGE1D_BUFF_ID = 40,
764       /// \brief OpenCL 2d image type.
765       PREDEF_TYPE_IMAGE2D_ID    = 41,
766       /// \brief OpenCL 2d image array type.
767       PREDEF_TYPE_IMAGE2D_ARR_ID = 42,
768       /// \brief OpenCL 3d image type.
769       PREDEF_TYPE_IMAGE3D_ID    = 43,
770       /// \brief OpenCL event type.
771       PREDEF_TYPE_EVENT_ID      = 44,
772       /// \brief OpenCL sampler type.
773       PREDEF_TYPE_SAMPLER_ID    = 45
774     };
775 
776     /// \brief The number of predefined type IDs that are reserved for
777     /// the PREDEF_TYPE_* constants.
778     ///
779     /// Type IDs for non-predefined types will start at
780     /// NUM_PREDEF_TYPE_IDs.
781     const unsigned NUM_PREDEF_TYPE_IDS = 100;
782 
783     /// \brief Record codes for each kind of type.
784     ///
785     /// These constants describe the type records that can occur within a
786     /// block identified by DECLTYPES_BLOCK_ID in the AST file. Each
787     /// constant describes a record for a specific type class in the
788     /// AST.
789     enum TypeCode {
790       /// \brief An ExtQualType record.
791       TYPE_EXT_QUAL                 = 1,
792       /// \brief A ComplexType record.
793       TYPE_COMPLEX                  = 3,
794       /// \brief A PointerType record.
795       TYPE_POINTER                  = 4,
796       /// \brief A BlockPointerType record.
797       TYPE_BLOCK_POINTER            = 5,
798       /// \brief An LValueReferenceType record.
799       TYPE_LVALUE_REFERENCE         = 6,
800       /// \brief An RValueReferenceType record.
801       TYPE_RVALUE_REFERENCE         = 7,
802       /// \brief A MemberPointerType record.
803       TYPE_MEMBER_POINTER           = 8,
804       /// \brief A ConstantArrayType record.
805       TYPE_CONSTANT_ARRAY           = 9,
806       /// \brief An IncompleteArrayType record.
807       TYPE_INCOMPLETE_ARRAY         = 10,
808       /// \brief A VariableArrayType record.
809       TYPE_VARIABLE_ARRAY           = 11,
810       /// \brief A VectorType record.
811       TYPE_VECTOR                   = 12,
812       /// \brief An ExtVectorType record.
813       TYPE_EXT_VECTOR               = 13,
814       /// \brief A FunctionNoProtoType record.
815       TYPE_FUNCTION_NO_PROTO        = 14,
816       /// \brief A FunctionProtoType record.
817       TYPE_FUNCTION_PROTO           = 15,
818       /// \brief A TypedefType record.
819       TYPE_TYPEDEF                  = 16,
820       /// \brief A TypeOfExprType record.
821       TYPE_TYPEOF_EXPR              = 17,
822       /// \brief A TypeOfType record.
823       TYPE_TYPEOF                   = 18,
824       /// \brief A RecordType record.
825       TYPE_RECORD                   = 19,
826       /// \brief An EnumType record.
827       TYPE_ENUM                     = 20,
828       /// \brief An ObjCInterfaceType record.
829       TYPE_OBJC_INTERFACE           = 21,
830       /// \brief An ObjCObjectPointerType record.
831       TYPE_OBJC_OBJECT_POINTER      = 22,
832       /// \brief a DecltypeType record.
833       TYPE_DECLTYPE                 = 23,
834       /// \brief An ElaboratedType record.
835       TYPE_ELABORATED               = 24,
836       /// \brief A SubstTemplateTypeParmType record.
837       TYPE_SUBST_TEMPLATE_TYPE_PARM = 25,
838       /// \brief An UnresolvedUsingType record.
839       TYPE_UNRESOLVED_USING         = 26,
840       /// \brief An InjectedClassNameType record.
841       TYPE_INJECTED_CLASS_NAME      = 27,
842       /// \brief An ObjCObjectType record.
843       TYPE_OBJC_OBJECT              = 28,
844       /// \brief An TemplateTypeParmType record.
845       TYPE_TEMPLATE_TYPE_PARM       = 29,
846       /// \brief An TemplateSpecializationType record.
847       TYPE_TEMPLATE_SPECIALIZATION  = 30,
848       /// \brief A DependentNameType record.
849       TYPE_DEPENDENT_NAME           = 31,
850       /// \brief A DependentTemplateSpecializationType record.
851       TYPE_DEPENDENT_TEMPLATE_SPECIALIZATION = 32,
852       /// \brief A DependentSizedArrayType record.
853       TYPE_DEPENDENT_SIZED_ARRAY    = 33,
854       /// \brief A ParenType record.
855       TYPE_PAREN                    = 34,
856       /// \brief A PackExpansionType record.
857       TYPE_PACK_EXPANSION           = 35,
858       /// \brief An AttributedType record.
859       TYPE_ATTRIBUTED               = 36,
860       /// \brief A SubstTemplateTypeParmPackType record.
861       TYPE_SUBST_TEMPLATE_TYPE_PARM_PACK = 37,
862       /// \brief A AutoType record.
863       TYPE_AUTO                  = 38,
864       /// \brief A UnaryTransformType record.
865       TYPE_UNARY_TRANSFORM       = 39,
866       /// \brief An AtomicType record.
867       TYPE_ATOMIC                = 40,
868       /// \brief A DecayedType record.
869       TYPE_DECAYED               = 41,
870       /// \brief An AdjustedType record.
871       TYPE_ADJUSTED              = 42
872     };
873 
874     /// \brief The type IDs for special types constructed by semantic
875     /// analysis.
876     ///
877     /// The constants in this enumeration are indices into the
878     /// SPECIAL_TYPES record.
879     enum SpecialTypeIDs {
880       /// \brief CFConstantString type
881       SPECIAL_TYPE_CF_CONSTANT_STRING          = 0,
882       /// \brief C FILE typedef type
883       SPECIAL_TYPE_FILE                        = 1,
884       /// \brief C jmp_buf typedef type
885       SPECIAL_TYPE_JMP_BUF                     = 2,
886       /// \brief C sigjmp_buf typedef type
887       SPECIAL_TYPE_SIGJMP_BUF                  = 3,
888       /// \brief Objective-C "id" redefinition type
889       SPECIAL_TYPE_OBJC_ID_REDEFINITION        = 4,
890       /// \brief Objective-C "Class" redefinition type
891       SPECIAL_TYPE_OBJC_CLASS_REDEFINITION     = 5,
892       /// \brief Objective-C "SEL" redefinition type
893       SPECIAL_TYPE_OBJC_SEL_REDEFINITION       = 6,
894       /// \brief C ucontext_t typedef type
895       SPECIAL_TYPE_UCONTEXT_T                  = 7
896     };
897 
898     /// \brief The number of special type IDs.
899     const unsigned NumSpecialTypeIDs = 8;
900 
901     /// \brief Predefined declaration IDs.
902     ///
903     /// These declaration IDs correspond to predefined declarations in the AST
904     /// context, such as the NULL declaration ID. Such declarations are never
905     /// actually serialized, since they will be built by the AST context when
906     /// it is created.
907     enum PredefinedDeclIDs {
908       /// \brief The NULL declaration.
909       PREDEF_DECL_NULL_ID       = 0,
910 
911       /// \brief The translation unit.
912       PREDEF_DECL_TRANSLATION_UNIT_ID = 1,
913 
914       /// \brief The Objective-C 'id' type.
915       PREDEF_DECL_OBJC_ID_ID = 2,
916 
917       /// \brief The Objective-C 'SEL' type.
918       PREDEF_DECL_OBJC_SEL_ID = 3,
919 
920       /// \brief The Objective-C 'Class' type.
921       PREDEF_DECL_OBJC_CLASS_ID = 4,
922 
923       /// \brief The Objective-C 'Protocol' type.
924       PREDEF_DECL_OBJC_PROTOCOL_ID = 5,
925 
926       /// \brief The signed 128-bit integer type.
927       PREDEF_DECL_INT_128_ID = 6,
928 
929       /// \brief The unsigned 128-bit integer type.
930       PREDEF_DECL_UNSIGNED_INT_128_ID = 7,
931 
932       /// \brief The internal 'instancetype' typedef.
933       PREDEF_DECL_OBJC_INSTANCETYPE_ID = 8,
934 
935       /// \brief The internal '__builtin_va_list' typedef.
936       PREDEF_DECL_BUILTIN_VA_LIST_ID = 9,
937 
938       /// \brief The extern "C" context.
939       PREDEF_DECL_EXTERN_C_CONTEXT_ID = 10,
940     };
941 
942     /// \brief The number of declaration IDs that are predefined.
943     ///
944     /// For more information about predefined declarations, see the
945     /// \c PredefinedDeclIDs type and the PREDEF_DECL_*_ID constants.
946     const unsigned int NUM_PREDEF_DECL_IDS = 11;
947 
948     /// \brief Record codes for each kind of declaration.
949     ///
950     /// These constants describe the declaration records that can occur within
951     /// a declarations block (identified by DECLS_BLOCK_ID). Each
952     /// constant describes a record for a specific declaration class
953     /// in the AST.
954     enum DeclCode {
955       /// \brief A TypedefDecl record.
956       DECL_TYPEDEF = 51,
957       /// \brief A TypeAliasDecl record.
958       DECL_TYPEALIAS,
959       /// \brief An EnumDecl record.
960       DECL_ENUM,
961       /// \brief A RecordDecl record.
962       DECL_RECORD,
963       /// \brief An EnumConstantDecl record.
964       DECL_ENUM_CONSTANT,
965       /// \brief A FunctionDecl record.
966       DECL_FUNCTION,
967       /// \brief A ObjCMethodDecl record.
968       DECL_OBJC_METHOD,
969       /// \brief A ObjCInterfaceDecl record.
970       DECL_OBJC_INTERFACE,
971       /// \brief A ObjCProtocolDecl record.
972       DECL_OBJC_PROTOCOL,
973       /// \brief A ObjCIvarDecl record.
974       DECL_OBJC_IVAR,
975       /// \brief A ObjCAtDefsFieldDecl record.
976       DECL_OBJC_AT_DEFS_FIELD,
977       /// \brief A ObjCCategoryDecl record.
978       DECL_OBJC_CATEGORY,
979       /// \brief A ObjCCategoryImplDecl record.
980       DECL_OBJC_CATEGORY_IMPL,
981       /// \brief A ObjCImplementationDecl record.
982       DECL_OBJC_IMPLEMENTATION,
983       /// \brief A ObjCCompatibleAliasDecl record.
984       DECL_OBJC_COMPATIBLE_ALIAS,
985       /// \brief A ObjCPropertyDecl record.
986       DECL_OBJC_PROPERTY,
987       /// \brief A ObjCPropertyImplDecl record.
988       DECL_OBJC_PROPERTY_IMPL,
989       /// \brief A FieldDecl record.
990       DECL_FIELD,
991       /// \brief A MSPropertyDecl record.
992       DECL_MS_PROPERTY,
993       /// \brief A VarDecl record.
994       DECL_VAR,
995       /// \brief An ImplicitParamDecl record.
996       DECL_IMPLICIT_PARAM,
997       /// \brief A ParmVarDecl record.
998       DECL_PARM_VAR,
999       /// \brief A FileScopeAsmDecl record.
1000       DECL_FILE_SCOPE_ASM,
1001       /// \brief A BlockDecl record.
1002       DECL_BLOCK,
1003       /// \brief A CapturedDecl record.
1004       DECL_CAPTURED,
1005       /// \brief A record that stores the set of declarations that are
1006       /// lexically stored within a given DeclContext.
1007       ///
1008       /// The record itself is a blob that is an array of declaration IDs,
1009       /// in the order in which those declarations were added to the
1010       /// declaration context. This data is used when iterating over
1011       /// the contents of a DeclContext, e.g., via
1012       /// DeclContext::decls_begin() and DeclContext::decls_end().
1013       DECL_CONTEXT_LEXICAL,
1014       /// \brief A record that stores the set of declarations that are
1015       /// visible from a given DeclContext.
1016       ///
1017       /// The record itself stores a set of mappings, each of which
1018       /// associates a declaration name with one or more declaration
1019       /// IDs. This data is used when performing qualified name lookup
1020       /// into a DeclContext via DeclContext::lookup.
1021       DECL_CONTEXT_VISIBLE,
1022       /// \brief A LabelDecl record.
1023       DECL_LABEL,
1024       /// \brief A NamespaceDecl record.
1025       DECL_NAMESPACE,
1026       /// \brief A NamespaceAliasDecl record.
1027       DECL_NAMESPACE_ALIAS,
1028       /// \brief A UsingDecl record.
1029       DECL_USING,
1030       /// \brief A UsingShadowDecl record.
1031       DECL_USING_SHADOW,
1032       /// \brief A UsingDirecitveDecl record.
1033       DECL_USING_DIRECTIVE,
1034       /// \brief An UnresolvedUsingValueDecl record.
1035       DECL_UNRESOLVED_USING_VALUE,
1036       /// \brief An UnresolvedUsingTypenameDecl record.
1037       DECL_UNRESOLVED_USING_TYPENAME,
1038       /// \brief A LinkageSpecDecl record.
1039       DECL_LINKAGE_SPEC,
1040       /// \brief A CXXRecordDecl record.
1041       DECL_CXX_RECORD,
1042       /// \brief A CXXMethodDecl record.
1043       DECL_CXX_METHOD,
1044       /// \brief A CXXConstructorDecl record.
1045       DECL_CXX_CONSTRUCTOR,
1046       /// \brief A CXXDestructorDecl record.
1047       DECL_CXX_DESTRUCTOR,
1048       /// \brief A CXXConversionDecl record.
1049       DECL_CXX_CONVERSION,
1050       /// \brief An AccessSpecDecl record.
1051       DECL_ACCESS_SPEC,
1052 
1053       /// \brief A FriendDecl record.
1054       DECL_FRIEND,
1055       /// \brief A FriendTemplateDecl record.
1056       DECL_FRIEND_TEMPLATE,
1057       /// \brief A ClassTemplateDecl record.
1058       DECL_CLASS_TEMPLATE,
1059       /// \brief A ClassTemplateSpecializationDecl record.
1060       DECL_CLASS_TEMPLATE_SPECIALIZATION,
1061       /// \brief A ClassTemplatePartialSpecializationDecl record.
1062       DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION,
1063       /// \brief A VarTemplateDecl record.
1064       DECL_VAR_TEMPLATE,
1065       /// \brief A VarTemplateSpecializationDecl record.
1066       DECL_VAR_TEMPLATE_SPECIALIZATION,
1067       /// \brief A VarTemplatePartialSpecializationDecl record.
1068       DECL_VAR_TEMPLATE_PARTIAL_SPECIALIZATION,
1069       /// \brief A FunctionTemplateDecl record.
1070       DECL_FUNCTION_TEMPLATE,
1071       /// \brief A TemplateTypeParmDecl record.
1072       DECL_TEMPLATE_TYPE_PARM,
1073       /// \brief A NonTypeTemplateParmDecl record.
1074       DECL_NON_TYPE_TEMPLATE_PARM,
1075       /// \brief A TemplateTemplateParmDecl record.
1076       DECL_TEMPLATE_TEMPLATE_PARM,
1077       /// \brief A TypeAliasTemplateDecl record.
1078       DECL_TYPE_ALIAS_TEMPLATE,
1079       /// \brief A StaticAssertDecl record.
1080       DECL_STATIC_ASSERT,
1081       /// \brief A record containing CXXBaseSpecifiers.
1082       DECL_CXX_BASE_SPECIFIERS,
1083       /// \brief A record containing CXXCtorInitializers.
1084       DECL_CXX_CTOR_INITIALIZERS,
1085       /// \brief A IndirectFieldDecl record.
1086       DECL_INDIRECTFIELD,
1087       /// \brief A NonTypeTemplateParmDecl record that stores an expanded
1088       /// non-type template parameter pack.
1089       DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK,
1090       /// \brief A TemplateTemplateParmDecl record that stores an expanded
1091       /// template template parameter pack.
1092       DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK,
1093       /// \brief A ClassScopeFunctionSpecializationDecl record a class scope
1094       /// function specialization. (Microsoft extension).
1095       DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION,
1096       /// \brief An ImportDecl recording a module import.
1097       DECL_IMPORT,
1098       /// \brief An OMPThreadPrivateDecl record.
1099       DECL_OMP_THREADPRIVATE,
1100       /// \brief An EmptyDecl record.
1101       DECL_EMPTY
1102     };
1103 
1104     /// \brief Record codes for each kind of statement or expression.
1105     ///
1106     /// These constants describe the records that describe statements
1107     /// or expressions. These records  occur within type and declarations
1108     /// block, so they begin with record values of 128.  Each constant
1109     /// describes a record for a specific statement or expression class in the
1110     /// AST.
1111     enum StmtCode {
1112       /// \brief A marker record that indicates that we are at the end
1113       /// of an expression.
1114       STMT_STOP = 128,
1115       /// \brief A NULL expression.
1116       STMT_NULL_PTR,
1117       /// \brief A reference to a previously [de]serialized Stmt record.
1118       STMT_REF_PTR,
1119       /// \brief A NullStmt record.
1120       STMT_NULL,
1121       /// \brief A CompoundStmt record.
1122       STMT_COMPOUND,
1123       /// \brief A CaseStmt record.
1124       STMT_CASE,
1125       /// \brief A DefaultStmt record.
1126       STMT_DEFAULT,
1127       /// \brief A LabelStmt record.
1128       STMT_LABEL,
1129       /// \brief An AttributedStmt record.
1130       STMT_ATTRIBUTED,
1131       /// \brief An IfStmt record.
1132       STMT_IF,
1133       /// \brief A SwitchStmt record.
1134       STMT_SWITCH,
1135       /// \brief A WhileStmt record.
1136       STMT_WHILE,
1137       /// \brief A DoStmt record.
1138       STMT_DO,
1139       /// \brief A ForStmt record.
1140       STMT_FOR,
1141       /// \brief A GotoStmt record.
1142       STMT_GOTO,
1143       /// \brief An IndirectGotoStmt record.
1144       STMT_INDIRECT_GOTO,
1145       /// \brief A ContinueStmt record.
1146       STMT_CONTINUE,
1147       /// \brief A BreakStmt record.
1148       STMT_BREAK,
1149       /// \brief A ReturnStmt record.
1150       STMT_RETURN,
1151       /// \brief A DeclStmt record.
1152       STMT_DECL,
1153       /// \brief A CapturedStmt record.
1154       STMT_CAPTURED,
1155       /// \brief A GCC-style AsmStmt record.
1156       STMT_GCCASM,
1157       /// \brief A MS-style AsmStmt record.
1158       STMT_MSASM,
1159       /// \brief A PredefinedExpr record.
1160       EXPR_PREDEFINED,
1161       /// \brief A DeclRefExpr record.
1162       EXPR_DECL_REF,
1163       /// \brief An IntegerLiteral record.
1164       EXPR_INTEGER_LITERAL,
1165       /// \brief A FloatingLiteral record.
1166       EXPR_FLOATING_LITERAL,
1167       /// \brief An ImaginaryLiteral record.
1168       EXPR_IMAGINARY_LITERAL,
1169       /// \brief A StringLiteral record.
1170       EXPR_STRING_LITERAL,
1171       /// \brief A CharacterLiteral record.
1172       EXPR_CHARACTER_LITERAL,
1173       /// \brief A ParenExpr record.
1174       EXPR_PAREN,
1175       /// \brief A ParenListExpr record.
1176       EXPR_PAREN_LIST,
1177       /// \brief A UnaryOperator record.
1178       EXPR_UNARY_OPERATOR,
1179       /// \brief An OffsetOfExpr record.
1180       EXPR_OFFSETOF,
1181       /// \brief A SizefAlignOfExpr record.
1182       EXPR_SIZEOF_ALIGN_OF,
1183       /// \brief An ArraySubscriptExpr record.
1184       EXPR_ARRAY_SUBSCRIPT,
1185       /// \brief A CallExpr record.
1186       EXPR_CALL,
1187       /// \brief A MemberExpr record.
1188       EXPR_MEMBER,
1189       /// \brief A BinaryOperator record.
1190       EXPR_BINARY_OPERATOR,
1191       /// \brief A CompoundAssignOperator record.
1192       EXPR_COMPOUND_ASSIGN_OPERATOR,
1193       /// \brief A ConditionOperator record.
1194       EXPR_CONDITIONAL_OPERATOR,
1195       /// \brief An ImplicitCastExpr record.
1196       EXPR_IMPLICIT_CAST,
1197       /// \brief A CStyleCastExpr record.
1198       EXPR_CSTYLE_CAST,
1199       /// \brief A CompoundLiteralExpr record.
1200       EXPR_COMPOUND_LITERAL,
1201       /// \brief An ExtVectorElementExpr record.
1202       EXPR_EXT_VECTOR_ELEMENT,
1203       /// \brief An InitListExpr record.
1204       EXPR_INIT_LIST,
1205       /// \brief A DesignatedInitExpr record.
1206       EXPR_DESIGNATED_INIT,
1207       /// \brief An ImplicitValueInitExpr record.
1208       EXPR_IMPLICIT_VALUE_INIT,
1209       /// \brief A VAArgExpr record.
1210       EXPR_VA_ARG,
1211       /// \brief An AddrLabelExpr record.
1212       EXPR_ADDR_LABEL,
1213       /// \brief A StmtExpr record.
1214       EXPR_STMT,
1215       /// \brief A ChooseExpr record.
1216       EXPR_CHOOSE,
1217       /// \brief A GNUNullExpr record.
1218       EXPR_GNU_NULL,
1219       /// \brief A ShuffleVectorExpr record.
1220       EXPR_SHUFFLE_VECTOR,
1221       /// \brief A ConvertVectorExpr record.
1222       EXPR_CONVERT_VECTOR,
1223       /// \brief BlockExpr
1224       EXPR_BLOCK,
1225       /// \brief A GenericSelectionExpr record.
1226       EXPR_GENERIC_SELECTION,
1227       /// \brief A PseudoObjectExpr record.
1228       EXPR_PSEUDO_OBJECT,
1229       /// \brief An AtomicExpr record.
1230       EXPR_ATOMIC,
1231 
1232       // Objective-C
1233 
1234       /// \brief An ObjCStringLiteral record.
1235       EXPR_OBJC_STRING_LITERAL,
1236 
1237       EXPR_OBJC_BOXED_EXPRESSION,
1238       EXPR_OBJC_ARRAY_LITERAL,
1239       EXPR_OBJC_DICTIONARY_LITERAL,
1240 
1241 
1242       /// \brief An ObjCEncodeExpr record.
1243       EXPR_OBJC_ENCODE,
1244       /// \brief An ObjCSelectorExpr record.
1245       EXPR_OBJC_SELECTOR_EXPR,
1246       /// \brief An ObjCProtocolExpr record.
1247       EXPR_OBJC_PROTOCOL_EXPR,
1248       /// \brief An ObjCIvarRefExpr record.
1249       EXPR_OBJC_IVAR_REF_EXPR,
1250       /// \brief An ObjCPropertyRefExpr record.
1251       EXPR_OBJC_PROPERTY_REF_EXPR,
1252       /// \brief An ObjCSubscriptRefExpr record.
1253       EXPR_OBJC_SUBSCRIPT_REF_EXPR,
1254       /// \brief UNUSED
1255       EXPR_OBJC_KVC_REF_EXPR,
1256       /// \brief An ObjCMessageExpr record.
1257       EXPR_OBJC_MESSAGE_EXPR,
1258       /// \brief An ObjCIsa Expr record.
1259       EXPR_OBJC_ISA,
1260       /// \brief An ObjCIndirectCopyRestoreExpr record.
1261       EXPR_OBJC_INDIRECT_COPY_RESTORE,
1262 
1263       /// \brief An ObjCForCollectionStmt record.
1264       STMT_OBJC_FOR_COLLECTION,
1265       /// \brief An ObjCAtCatchStmt record.
1266       STMT_OBJC_CATCH,
1267       /// \brief An ObjCAtFinallyStmt record.
1268       STMT_OBJC_FINALLY,
1269       /// \brief An ObjCAtTryStmt record.
1270       STMT_OBJC_AT_TRY,
1271       /// \brief An ObjCAtSynchronizedStmt record.
1272       STMT_OBJC_AT_SYNCHRONIZED,
1273       /// \brief An ObjCAtThrowStmt record.
1274       STMT_OBJC_AT_THROW,
1275       /// \brief An ObjCAutoreleasePoolStmt record.
1276       STMT_OBJC_AUTORELEASE_POOL,
1277       /// \brief A ObjCBoolLiteralExpr record.
1278       EXPR_OBJC_BOOL_LITERAL,
1279 
1280       // C++
1281 
1282       /// \brief A CXXCatchStmt record.
1283       STMT_CXX_CATCH,
1284       /// \brief A CXXTryStmt record.
1285       STMT_CXX_TRY,
1286       /// \brief A CXXForRangeStmt record.
1287       STMT_CXX_FOR_RANGE,
1288 
1289       /// \brief A CXXOperatorCallExpr record.
1290       EXPR_CXX_OPERATOR_CALL,
1291       /// \brief A CXXMemberCallExpr record.
1292       EXPR_CXX_MEMBER_CALL,
1293       /// \brief A CXXConstructExpr record.
1294       EXPR_CXX_CONSTRUCT,
1295       /// \brief A CXXTemporaryObjectExpr record.
1296       EXPR_CXX_TEMPORARY_OBJECT,
1297       /// \brief A CXXStaticCastExpr record.
1298       EXPR_CXX_STATIC_CAST,
1299       /// \brief A CXXDynamicCastExpr record.
1300       EXPR_CXX_DYNAMIC_CAST,
1301       /// \brief A CXXReinterpretCastExpr record.
1302       EXPR_CXX_REINTERPRET_CAST,
1303       /// \brief A CXXConstCastExpr record.
1304       EXPR_CXX_CONST_CAST,
1305       /// \brief A CXXFunctionalCastExpr record.
1306       EXPR_CXX_FUNCTIONAL_CAST,
1307       /// \brief A UserDefinedLiteral record.
1308       EXPR_USER_DEFINED_LITERAL,
1309       /// \brief A CXXStdInitializerListExpr record.
1310       EXPR_CXX_STD_INITIALIZER_LIST,
1311       /// \brief A CXXBoolLiteralExpr record.
1312       EXPR_CXX_BOOL_LITERAL,
1313       EXPR_CXX_NULL_PTR_LITERAL,  // CXXNullPtrLiteralExpr
1314       EXPR_CXX_TYPEID_EXPR,       // CXXTypeidExpr (of expr).
1315       EXPR_CXX_TYPEID_TYPE,       // CXXTypeidExpr (of type).
1316       EXPR_CXX_THIS,              // CXXThisExpr
1317       EXPR_CXX_THROW,             // CXXThrowExpr
1318       EXPR_CXX_DEFAULT_ARG,       // CXXDefaultArgExpr
1319       EXPR_CXX_DEFAULT_INIT,      // CXXDefaultInitExpr
1320       EXPR_CXX_BIND_TEMPORARY,    // CXXBindTemporaryExpr
1321 
1322       EXPR_CXX_SCALAR_VALUE_INIT, // CXXScalarValueInitExpr
1323       EXPR_CXX_NEW,               // CXXNewExpr
1324       EXPR_CXX_DELETE,            // CXXDeleteExpr
1325       EXPR_CXX_PSEUDO_DESTRUCTOR, // CXXPseudoDestructorExpr
1326 
1327       EXPR_EXPR_WITH_CLEANUPS,    // ExprWithCleanups
1328 
1329       EXPR_CXX_DEPENDENT_SCOPE_MEMBER,   // CXXDependentScopeMemberExpr
1330       EXPR_CXX_DEPENDENT_SCOPE_DECL_REF, // DependentScopeDeclRefExpr
1331       EXPR_CXX_UNRESOLVED_CONSTRUCT,     // CXXUnresolvedConstructExpr
1332       EXPR_CXX_UNRESOLVED_MEMBER,        // UnresolvedMemberExpr
1333       EXPR_CXX_UNRESOLVED_LOOKUP,        // UnresolvedLookupExpr
1334 
1335       EXPR_CXX_EXPRESSION_TRAIT,  // ExpressionTraitExpr
1336       EXPR_CXX_NOEXCEPT,          // CXXNoexceptExpr
1337 
1338       EXPR_OPAQUE_VALUE,          // OpaqueValueExpr
1339       EXPR_BINARY_CONDITIONAL_OPERATOR,  // BinaryConditionalOperator
1340       EXPR_TYPE_TRAIT,            // TypeTraitExpr
1341       EXPR_ARRAY_TYPE_TRAIT,      // ArrayTypeTraitIntExpr
1342 
1343       EXPR_PACK_EXPANSION,        // PackExpansionExpr
1344       EXPR_SIZEOF_PACK,           // SizeOfPackExpr
1345       EXPR_SUBST_NON_TYPE_TEMPLATE_PARM, // SubstNonTypeTemplateParmExpr
1346       EXPR_SUBST_NON_TYPE_TEMPLATE_PARM_PACK,// SubstNonTypeTemplateParmPackExpr
1347       EXPR_FUNCTION_PARM_PACK,    // FunctionParmPackExpr
1348       EXPR_MATERIALIZE_TEMPORARY, // MaterializeTemporaryExpr
1349       EXPR_CXX_FOLD,              // CXXFoldExpr
1350 
1351       // CUDA
1352       EXPR_CUDA_KERNEL_CALL,       // CUDAKernelCallExpr
1353 
1354       // OpenCL
1355       EXPR_ASTYPE,                 // AsTypeExpr
1356 
1357       // Microsoft
1358       EXPR_CXX_PROPERTY_REF_EXPR, // MSPropertyRefExpr
1359       EXPR_CXX_UUIDOF_EXPR,       // CXXUuidofExpr (of expr).
1360       EXPR_CXX_UUIDOF_TYPE,       // CXXUuidofExpr (of type).
1361       STMT_SEH_LEAVE,             // SEHLeaveStmt
1362       STMT_SEH_EXCEPT,            // SEHExceptStmt
1363       STMT_SEH_FINALLY,           // SEHFinallyStmt
1364       STMT_SEH_TRY,               // SEHTryStmt
1365 
1366       // OpenMP directives
1367       STMT_OMP_PARALLEL_DIRECTIVE,
1368       STMT_OMP_SIMD_DIRECTIVE,
1369       STMT_OMP_FOR_DIRECTIVE,
1370       STMT_OMP_FOR_SIMD_DIRECTIVE,
1371       STMT_OMP_SECTIONS_DIRECTIVE,
1372       STMT_OMP_SECTION_DIRECTIVE,
1373       STMT_OMP_SINGLE_DIRECTIVE,
1374       STMT_OMP_MASTER_DIRECTIVE,
1375       STMT_OMP_CRITICAL_DIRECTIVE,
1376       STMT_OMP_PARALLEL_FOR_DIRECTIVE,
1377       STMT_OMP_PARALLEL_FOR_SIMD_DIRECTIVE,
1378       STMT_OMP_PARALLEL_SECTIONS_DIRECTIVE,
1379       STMT_OMP_TASK_DIRECTIVE,
1380       STMT_OMP_TASKYIELD_DIRECTIVE,
1381       STMT_OMP_BARRIER_DIRECTIVE,
1382       STMT_OMP_TASKWAIT_DIRECTIVE,
1383       STMT_OMP_FLUSH_DIRECTIVE,
1384       STMT_OMP_ORDERED_DIRECTIVE,
1385       STMT_OMP_ATOMIC_DIRECTIVE,
1386       STMT_OMP_TARGET_DIRECTIVE,
1387       STMT_OMP_TEAMS_DIRECTIVE,
1388 
1389       // ARC
1390       EXPR_OBJC_BRIDGED_CAST,     // ObjCBridgedCastExpr
1391 
1392       STMT_MS_DEPENDENT_EXISTS,   // MSDependentExistsStmt
1393       EXPR_LAMBDA                 // LambdaExpr
1394     };
1395 
1396     /// \brief The kinds of designators that can occur in a
1397     /// DesignatedInitExpr.
1398     enum DesignatorTypes {
1399       /// \brief Field designator where only the field name is known.
1400       DESIG_FIELD_NAME  = 0,
1401       /// \brief Field designator where the field has been resolved to
1402       /// a declaration.
1403       DESIG_FIELD_DECL  = 1,
1404       /// \brief Array designator.
1405       DESIG_ARRAY       = 2,
1406       /// \brief GNU array range designator.
1407       DESIG_ARRAY_RANGE = 3
1408     };
1409 
1410     /// \brief The different kinds of data that can occur in a
1411     /// CtorInitializer.
1412     enum CtorInitializerType {
1413       CTOR_INITIALIZER_BASE,
1414       CTOR_INITIALIZER_DELEGATING,
1415       CTOR_INITIALIZER_MEMBER,
1416       CTOR_INITIALIZER_INDIRECT_MEMBER
1417     };
1418 
1419     /// \brief Describes the redeclarations of a declaration.
1420     struct LocalRedeclarationsInfo {
1421       DeclID FirstID;      // The ID of the first declaration
1422       unsigned Offset;     // Offset into the array of redeclaration chains.
1423 
1424       friend bool operator<(const LocalRedeclarationsInfo &X,
1425                             const LocalRedeclarationsInfo &Y) {
1426         return X.FirstID < Y.FirstID;
1427       }
1428 
1429       friend bool operator>(const LocalRedeclarationsInfo &X,
1430                             const LocalRedeclarationsInfo &Y) {
1431         return X.FirstID > Y.FirstID;
1432       }
1433 
1434       friend bool operator<=(const LocalRedeclarationsInfo &X,
1435                              const LocalRedeclarationsInfo &Y) {
1436         return X.FirstID <= Y.FirstID;
1437       }
1438 
1439       friend bool operator>=(const LocalRedeclarationsInfo &X,
1440                              const LocalRedeclarationsInfo &Y) {
1441         return X.FirstID >= Y.FirstID;
1442       }
1443     };
1444 
1445     /// \brief Describes the categories of an Objective-C class.
1446     struct ObjCCategoriesInfo {
1447       DeclID DefinitionID; // The ID of the definition
1448       unsigned Offset;     // Offset into the array of category lists.
1449 
1450       friend bool operator<(const ObjCCategoriesInfo &X,
1451                             const ObjCCategoriesInfo &Y) {
1452         return X.DefinitionID < Y.DefinitionID;
1453       }
1454 
1455       friend bool operator>(const ObjCCategoriesInfo &X,
1456                             const ObjCCategoriesInfo &Y) {
1457         return X.DefinitionID > Y.DefinitionID;
1458       }
1459 
1460       friend bool operator<=(const ObjCCategoriesInfo &X,
1461                              const ObjCCategoriesInfo &Y) {
1462         return X.DefinitionID <= Y.DefinitionID;
1463       }
1464 
1465       friend bool operator>=(const ObjCCategoriesInfo &X,
1466                              const ObjCCategoriesInfo &Y) {
1467         return X.DefinitionID >= Y.DefinitionID;
1468       }
1469     };
1470 
1471     /// @}
1472   }
1473 } // end namespace clang
1474 
1475 #endif
1476