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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_FRONTEND_PCHBITCODES_H
18 #define LLVM_CLANG_FRONTEND_PCHBITCODES_H
19 
20 #include "clang/AST/Type.h"
21 #include "llvm/Bitcode/BitCodes.h"
22 #include "llvm/Support/DataTypes.h"
23 #include "llvm/ADT/DenseMap.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 = 4;
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 an ObjC selector in an AST file.
131     typedef uint32_t SelectorID;
132 
133     /// \brief The number of predefined selector IDs.
134     const unsigned int NUM_PREDEF_SELECTOR_IDS = 1;
135 
136     /// \brief An ID number that refers to a set of CXXBaseSpecifiers in an
137     /// AST file.
138     typedef uint32_t CXXBaseSpecifiersID;
139 
140     /// \brief An ID number that refers to an entity in the detailed
141     /// preprocessing record.
142     typedef uint32_t PreprocessedEntityID;
143 
144     /// \brief An ID number that refers to a submodule in a module file.
145     typedef uint32_t SubmoduleID;
146 
147     /// \brief The number of predefined submodule IDs.
148     const unsigned int NUM_PREDEF_SUBMODULE_IDS = 1;
149 
150     /// \brief Source range/offset of a preprocessed entity.
151     struct PPEntityOffset {
152       /// \brief Raw source location of beginning of range.
153       unsigned Begin;
154       /// \brief Raw source location of end of range.
155       unsigned End;
156       /// \brief Offset in the AST file.
157       uint32_t BitOffset;
158 
PPEntityOffsetPPEntityOffset159       PPEntityOffset(SourceRange R, uint32_t BitOffset)
160         : Begin(R.getBegin().getRawEncoding()),
161           End(R.getEnd().getRawEncoding()),
162           BitOffset(BitOffset) { }
163     };
164 
165     /// \brief Source range/offset of a preprocessed entity.
166     struct DeclOffset {
167       /// \brief Raw source location.
168       unsigned Loc;
169       /// \brief Offset in the AST file.
170       uint32_t BitOffset;
171 
DeclOffsetDeclOffset172       DeclOffset() : Loc(0), BitOffset(0) { }
DeclOffsetDeclOffset173       DeclOffset(SourceLocation Loc, uint32_t BitOffset)
174         : Loc(Loc.getRawEncoding()),
175           BitOffset(BitOffset) { }
setLocationDeclOffset176       void setLocation(SourceLocation L) {
177         Loc = L.getRawEncoding();
178       }
179     };
180 
181     /// \brief The number of predefined preprocessed entity IDs.
182     const unsigned int NUM_PREDEF_PP_ENTITY_IDS = 1;
183 
184     /// \brief Describes the various kinds of blocks that occur within
185     /// an AST file.
186     enum BlockIDs {
187       /// \brief The AST block, which acts as a container around the
188       /// full AST block.
189       AST_BLOCK_ID = llvm::bitc::FIRST_APPLICATION_BLOCKID,
190 
191       /// \brief The block containing information about the source
192       /// manager.
193       SOURCE_MANAGER_BLOCK_ID,
194 
195       /// \brief The block containing information about the
196       /// preprocessor.
197       PREPROCESSOR_BLOCK_ID,
198 
199       /// \brief The block containing the definitions of all of the
200       /// types and decls used within the AST file.
201       DECLTYPES_BLOCK_ID,
202 
203       /// \brief The block containing DECL_UPDATES records.
204       DECL_UPDATES_BLOCK_ID,
205 
206       /// \brief The block containing the detailed preprocessing record.
207       PREPROCESSOR_DETAIL_BLOCK_ID,
208 
209       /// \brief The block containing the submodule structure.
210       SUBMODULE_BLOCK_ID,
211 
212       /// \brief The block containing comments.
213       COMMENTS_BLOCK_ID
214     };
215 
216     /// \brief Record types that occur within the AST block itself.
217     enum ASTRecordTypes {
218       /// \brief Record code for the offsets of each type.
219       ///
220       /// The TYPE_OFFSET constant describes the record that occurs
221       /// within the AST block. The record itself is an array of offsets that
222       /// point into the declarations and types block (identified by
223       /// DECLTYPES_BLOCK_ID). The index into the array is based on the ID
224       /// of a type. For a given type ID @c T, the lower three bits of
225       /// @c T are its qualifiers (const, volatile, restrict), as in
226       /// the QualType class. The upper bits, after being shifted and
227       /// subtracting NUM_PREDEF_TYPE_IDS, are used to index into the
228       /// TYPE_OFFSET block to determine the offset of that type's
229       /// corresponding record within the DECLTYPES_BLOCK_ID block.
230       TYPE_OFFSET = 1,
231 
232       /// \brief Record code for the offsets of each decl.
233       ///
234       /// The DECL_OFFSET constant describes the record that occurs
235       /// within the block identified by DECL_OFFSETS_BLOCK_ID within
236       /// the AST block. The record itself is an array of offsets that
237       /// point into the declarations and types block (identified by
238       /// DECLTYPES_BLOCK_ID). The declaration ID is an index into this
239       /// record, after subtracting one to account for the use of
240       /// declaration ID 0 for a NULL declaration pointer. Index 0 is
241       /// reserved for the translation unit declaration.
242       DECL_OFFSET = 2,
243 
244       /// \brief Record code for the language options table.
245       ///
246       /// The record with this code contains the contents of the
247       /// LangOptions structure. We serialize the entire contents of
248       /// the structure, and let the reader decide which options are
249       /// actually important to check.
250       LANGUAGE_OPTIONS = 3,
251 
252       /// \brief AST file metadata, including the AST file version number
253       /// and the target triple used to build the AST file.
254       METADATA = 4,
255 
256       /// \brief Record code for the table of offsets of each
257       /// identifier ID.
258       ///
259       /// The offset table contains offsets into the blob stored in
260       /// the IDENTIFIER_TABLE record. Each offset points to the
261       /// NULL-terminated string that corresponds to that identifier.
262       IDENTIFIER_OFFSET = 5,
263 
264       /// \brief Record code for the identifier table.
265       ///
266       /// The identifier table is a simple blob that contains
267       /// NULL-terminated strings for all of the identifiers
268       /// referenced by the AST file. The IDENTIFIER_OFFSET table
269       /// contains the mapping from identifier IDs to the characters
270       /// in this blob. Note that the starting offsets of all of the
271       /// identifiers are odd, so that, when the identifier offset
272       /// table is loaded in, we can use the low bit to distinguish
273       /// between offsets (for unresolved identifier IDs) and
274       /// IdentifierInfo pointers (for already-resolved identifier
275       /// IDs).
276       IDENTIFIER_TABLE = 6,
277 
278       /// \brief Record code for the array of external definitions.
279       ///
280       /// The AST file contains a list of all of the unnamed external
281       /// definitions present within the parsed headers, stored as an
282       /// array of declaration IDs. These external definitions will be
283       /// reported to the AST consumer after the AST file has been
284       /// read, since their presence can affect the semantics of the
285       /// program (e.g., for code generation).
286       EXTERNAL_DEFINITIONS = 7,
287 
288       /// \brief Record code for the set of non-builtin, special
289       /// types.
290       ///
291       /// This record contains the type IDs for the various type nodes
292       /// that are constructed during semantic analysis (e.g.,
293       /// __builtin_va_list). The SPECIAL_TYPE_* constants provide
294       /// offsets into this record.
295       SPECIAL_TYPES = 8,
296 
297       /// \brief Record code for the extra statistics we gather while
298       /// generating an AST file.
299       STATISTICS = 9,
300 
301       /// \brief Record code for the array of tentative definitions.
302       TENTATIVE_DEFINITIONS = 10,
303 
304       /// \brief Record code for the array of locally-scoped external
305       /// declarations.
306       LOCALLY_SCOPED_EXTERNAL_DECLS = 11,
307 
308       /// \brief Record code for the table of offsets into the
309       /// Objective-C method pool.
310       SELECTOR_OFFSETS = 12,
311 
312       /// \brief Record code for the Objective-C method pool,
313       METHOD_POOL = 13,
314 
315       /// \brief The value of the next __COUNTER__ to dispense.
316       /// [PP_COUNTER_VALUE, Val]
317       PP_COUNTER_VALUE = 14,
318 
319       /// \brief Record code for the table of offsets into the block
320       /// of source-location information.
321       SOURCE_LOCATION_OFFSETS = 15,
322 
323       /// \brief Record code for the set of source location entries
324       /// that need to be preloaded by the AST reader.
325       ///
326       /// This set contains the source location entry for the
327       /// predefines buffer and for any file entries that need to be
328       /// preloaded.
329       SOURCE_LOCATION_PRELOADS = 16,
330 
331       /// \brief Record code for the stat() cache.
332       STAT_CACHE = 17,
333 
334       /// \brief Record code for the set of ext_vector type names.
335       EXT_VECTOR_DECLS = 18,
336 
337       /// \brief Record code for the original file that was used to
338       /// generate the AST file.
339       ORIGINAL_FILE_NAME = 19,
340 
341       /// \brief Record code for the file ID of the original file used to
342       /// generate the AST file.
343       ORIGINAL_FILE_ID = 20,
344 
345       /// \brief Record code for the version control branch and revision
346       /// information of the compiler used to build this AST file.
347       VERSION_CONTROL_BRANCH_REVISION = 21,
348 
349       /// \brief Record code for the array of unused file scoped decls.
350       UNUSED_FILESCOPED_DECLS = 22,
351 
352       /// \brief Record code for the table of offsets to entries in the
353       /// preprocessing record.
354       PPD_ENTITIES_OFFSETS = 23,
355 
356       /// \brief Record code for the array of VTable uses.
357       VTABLE_USES = 24,
358 
359       /// \brief Record code for the array of dynamic classes.
360       DYNAMIC_CLASSES = 25,
361 
362       /// \brief Record code for the list of other AST files imported by
363       /// this AST file.
364       IMPORTS = 26,
365 
366       /// \brief Record code for referenced selector pool.
367       REFERENCED_SELECTOR_POOL = 27,
368 
369       /// \brief Record code for an update to the TU's lexically contained
370       /// declarations.
371       TU_UPDATE_LEXICAL = 28,
372 
373       /// \brief Record code for the array describing the locations (in the
374       /// LOCAL_REDECLARATIONS record) of the redeclaration chains, indexed by
375       /// the first known ID.
376       LOCAL_REDECLARATIONS_MAP = 29,
377 
378       /// \brief Record code for declarations that Sema keeps references of.
379       SEMA_DECL_REFS = 30,
380 
381       /// \brief Record code for weak undeclared identifiers.
382       WEAK_UNDECLARED_IDENTIFIERS = 31,
383 
384       /// \brief Record code for pending implicit instantiations.
385       PENDING_IMPLICIT_INSTANTIATIONS = 32,
386 
387       /// \brief Record code for a decl replacement block.
388       ///
389       /// If a declaration is modified after having been deserialized, and then
390       /// written to a dependent AST file, its ID and offset must be added to
391       /// the replacement block.
392       DECL_REPLACEMENTS = 33,
393 
394       /// \brief Record code for an update to a decl context's lookup table.
395       ///
396       /// In practice, this should only be used for the TU and namespaces.
397       UPDATE_VISIBLE = 34,
398 
399       /// \brief Record for offsets of DECL_UPDATES records for declarations
400       /// that were modified after being deserialized and need updates.
401       DECL_UPDATE_OFFSETS = 35,
402 
403       /// \brief Record of updates for a declaration that was modified after
404       /// being deserialized.
405       DECL_UPDATES = 36,
406 
407       /// \brief Record code for the table of offsets to CXXBaseSpecifier
408       /// sets.
409       CXX_BASE_SPECIFIER_OFFSETS = 37,
410 
411       /// \brief Record code for \#pragma diagnostic mappings.
412       DIAG_PRAGMA_MAPPINGS = 38,
413 
414       /// \brief Record code for special CUDA declarations.
415       CUDA_SPECIAL_DECL_REFS = 39,
416 
417       /// \brief Record code for header search information.
418       HEADER_SEARCH_TABLE = 40,
419 
420       /// \brief The directory that the PCH was originally created in.
421       ORIGINAL_PCH_DIR = 41,
422 
423       /// \brief Record code for floating point \#pragma options.
424       FP_PRAGMA_OPTIONS = 42,
425 
426       /// \brief Record code for enabled OpenCL extensions.
427       OPENCL_EXTENSIONS = 43,
428 
429       /// \brief The list of delegating constructor declarations.
430       DELEGATING_CTORS = 44,
431 
432       /// \brief Record code for the table of offsets into the block
433       /// of file source-location information.
434       FILE_SOURCE_LOCATION_OFFSETS = 45,
435 
436       /// \brief Record code for the set of known namespaces, which are used
437       /// for typo correction.
438       KNOWN_NAMESPACES = 46,
439 
440       /// \brief Record code for the remapping information used to relate
441       /// loaded modules to the various offsets and IDs(e.g., source location
442       /// offests, declaration and type IDs) that are used in that module to
443       /// refer to other modules.
444       MODULE_OFFSET_MAP = 47,
445 
446       /// \brief Record code for the source manager line table information,
447       /// which stores information about \#line directives.
448       SOURCE_MANAGER_LINE_TABLE = 48,
449 
450       /// \brief Record code for map of Objective-C class definition IDs to the
451       /// ObjC categories in a module that are attached to that class.
452       OBJC_CATEGORIES_MAP = 49,
453 
454       /// \brief Record code for a file sorted array of DeclIDs in a module.
455       FILE_SORTED_DECLS = 50,
456 
457       /// \brief Record code for an array of all of the (sub)modules that were
458       /// imported by the AST file.
459       IMPORTED_MODULES = 51,
460 
461       /// \brief Record code for the set of merged declarations in an AST file.
462       MERGED_DECLARATIONS = 52,
463 
464       /// \brief Record code for the array of redeclaration chains.
465       ///
466       /// This array can only be interpreted properly using the local
467       /// redeclarations map.
468       LOCAL_REDECLARATIONS = 53,
469 
470       /// \brief Record code for the array of Objective-C categories (including
471       /// extensions).
472       ///
473       /// This array can only be interpreted properly using the Objective-C
474       /// categories map.
475       OBJC_CATEGORIES = 54
476     };
477 
478     /// \brief Record types used within a source manager block.
479     enum SourceManagerRecordTypes {
480       /// \brief Describes a source location entry (SLocEntry) for a
481       /// file.
482       SM_SLOC_FILE_ENTRY = 1,
483       /// \brief Describes a source location entry (SLocEntry) for a
484       /// buffer.
485       SM_SLOC_BUFFER_ENTRY = 2,
486       /// \brief Describes a blob that contains the data for a buffer
487       /// entry. This kind of record always directly follows a
488       /// SM_SLOC_BUFFER_ENTRY record or a SM_SLOC_FILE_ENTRY with an
489       /// overridden buffer.
490       SM_SLOC_BUFFER_BLOB = 3,
491       /// \brief Describes a source location entry (SLocEntry) for a
492       /// macro expansion.
493       SM_SLOC_EXPANSION_ENTRY = 4
494     };
495 
496     /// \brief Record types used within a preprocessor block.
497     enum PreprocessorRecordTypes {
498       // The macros in the PP section are a PP_MACRO_* instance followed by a
499       // list of PP_TOKEN instances for each token in the definition.
500 
501       /// \brief An object-like macro definition.
502       /// [PP_MACRO_OBJECT_LIKE, IdentInfoID, SLoc, IsUsed]
503       PP_MACRO_OBJECT_LIKE = 1,
504 
505       /// \brief A function-like macro definition.
506       /// [PP_MACRO_FUNCTION_LIKE, \<ObjectLikeStuff>, IsC99Varargs,
507       /// IsGNUVarars, NumArgs, ArgIdentInfoID* ]
508       PP_MACRO_FUNCTION_LIKE = 2,
509 
510       /// \brief Describes one token.
511       /// [PP_TOKEN, SLoc, Length, IdentInfoID, Kind, Flags]
512       PP_TOKEN = 3
513     };
514 
515     /// \brief Record types used within a preprocessor detail block.
516     enum PreprocessorDetailRecordTypes {
517       /// \brief Describes a macro expansion within the preprocessing record.
518       PPD_MACRO_EXPANSION = 0,
519 
520       /// \brief Describes a macro definition within the preprocessing record.
521       PPD_MACRO_DEFINITION = 1,
522 
523       /// \brief Describes an inclusion directive within the preprocessing
524       /// record.
525       PPD_INCLUSION_DIRECTIVE = 2
526     };
527 
528     /// \brief Record types used within a submodule description block.
529     enum SubmoduleRecordTypes {
530       /// \brief Metadata for submodules as a whole.
531       SUBMODULE_METADATA = 0,
532       /// \brief Defines the major attributes of a submodule, including its
533       /// name and parent.
534       SUBMODULE_DEFINITION = 1,
535       /// \brief Specifies the umbrella header used to create this module,
536       /// if any.
537       SUBMODULE_UMBRELLA_HEADER = 2,
538       /// \brief Specifies a header that falls into this (sub)module.
539       SUBMODULE_HEADER = 3,
540       /// \brief Specifies an umbrella directory.
541       SUBMODULE_UMBRELLA_DIR = 4,
542       /// \brief Specifies the submodules that are imported by this
543       /// submodule.
544       SUBMODULE_IMPORTS = 5,
545       /// \brief Specifies the submodules that are re-exported from this
546       /// submodule.
547       SUBMODULE_EXPORTS = 6,
548       /// \brief Specifies a required feature.
549       SUBMODULE_REQUIRES = 7
550     };
551 
552     /// \brief Record types used within a comments block.
553     enum CommentRecordTypes {
554       COMMENTS_RAW_COMMENT = 0
555     };
556 
557     /// \defgroup ASTAST AST file AST constants
558     ///
559     /// The constants in this group describe various components of the
560     /// abstract syntax tree within an AST file.
561     ///
562     /// @{
563 
564     /// \brief Predefined type IDs.
565     ///
566     /// These type IDs correspond to predefined types in the AST
567     /// context, such as built-in types (int) and special place-holder
568     /// types (the \<overload> and \<dependent> type markers). Such
569     /// types are never actually serialized, since they will be built
570     /// by the AST context when it is created.
571     enum PredefinedTypeIDs {
572       /// \brief The NULL type.
573       PREDEF_TYPE_NULL_ID       = 0,
574       /// \brief The void type.
575       PREDEF_TYPE_VOID_ID       = 1,
576       /// \brief The 'bool' or '_Bool' type.
577       PREDEF_TYPE_BOOL_ID       = 2,
578       /// \brief The 'char' type, when it is unsigned.
579       PREDEF_TYPE_CHAR_U_ID     = 3,
580       /// \brief The 'unsigned char' type.
581       PREDEF_TYPE_UCHAR_ID      = 4,
582       /// \brief The 'unsigned short' type.
583       PREDEF_TYPE_USHORT_ID     = 5,
584       /// \brief The 'unsigned int' type.
585       PREDEF_TYPE_UINT_ID       = 6,
586       /// \brief The 'unsigned long' type.
587       PREDEF_TYPE_ULONG_ID      = 7,
588       /// \brief The 'unsigned long long' type.
589       PREDEF_TYPE_ULONGLONG_ID  = 8,
590       /// \brief The 'char' type, when it is signed.
591       PREDEF_TYPE_CHAR_S_ID     = 9,
592       /// \brief The 'signed char' type.
593       PREDEF_TYPE_SCHAR_ID      = 10,
594       /// \brief The C++ 'wchar_t' type.
595       PREDEF_TYPE_WCHAR_ID      = 11,
596       /// \brief The (signed) 'short' type.
597       PREDEF_TYPE_SHORT_ID      = 12,
598       /// \brief The (signed) 'int' type.
599       PREDEF_TYPE_INT_ID        = 13,
600       /// \brief The (signed) 'long' type.
601       PREDEF_TYPE_LONG_ID       = 14,
602       /// \brief The (signed) 'long long' type.
603       PREDEF_TYPE_LONGLONG_ID   = 15,
604       /// \brief The 'float' type.
605       PREDEF_TYPE_FLOAT_ID      = 16,
606       /// \brief The 'double' type.
607       PREDEF_TYPE_DOUBLE_ID     = 17,
608       /// \brief The 'long double' type.
609       PREDEF_TYPE_LONGDOUBLE_ID = 18,
610       /// \brief The placeholder type for overloaded function sets.
611       PREDEF_TYPE_OVERLOAD_ID   = 19,
612       /// \brief The placeholder type for dependent types.
613       PREDEF_TYPE_DEPENDENT_ID  = 20,
614       /// \brief The '__uint128_t' type.
615       PREDEF_TYPE_UINT128_ID    = 21,
616       /// \brief The '__int128_t' type.
617       PREDEF_TYPE_INT128_ID     = 22,
618       /// \brief The type of 'nullptr'.
619       PREDEF_TYPE_NULLPTR_ID    = 23,
620       /// \brief The C++ 'char16_t' type.
621       PREDEF_TYPE_CHAR16_ID     = 24,
622       /// \brief The C++ 'char32_t' type.
623       PREDEF_TYPE_CHAR32_ID     = 25,
624       /// \brief The ObjC 'id' type.
625       PREDEF_TYPE_OBJC_ID       = 26,
626       /// \brief The ObjC 'Class' type.
627       PREDEF_TYPE_OBJC_CLASS    = 27,
628       /// \brief The ObjC 'SEL' type.
629       PREDEF_TYPE_OBJC_SEL      = 28,
630       /// \brief The 'unknown any' placeholder type.
631       PREDEF_TYPE_UNKNOWN_ANY   = 29,
632       /// \brief The placeholder type for bound member functions.
633       PREDEF_TYPE_BOUND_MEMBER  = 30,
634       /// \brief The "auto" deduction type.
635       PREDEF_TYPE_AUTO_DEDUCT   = 31,
636       /// \brief The "auto &&" deduction type.
637       PREDEF_TYPE_AUTO_RREF_DEDUCT = 32,
638       /// \brief The OpenCL 'half' / ARM NEON __fp16 type.
639       PREDEF_TYPE_HALF_ID       = 33,
640       /// \brief ARC's unbridged-cast placeholder type.
641       PREDEF_TYPE_ARC_UNBRIDGED_CAST = 34,
642       /// \brief The pseudo-object placeholder type.
643       PREDEF_TYPE_PSEUDO_OBJECT = 35,
644       /// \brief The __va_list_tag placeholder type.
645       PREDEF_TYPE_VA_LIST_TAG = 36,
646       /// \brief The placeholder type for builtin functions.
647       PREDEF_TYPE_BUILTIN_FN = 37
648     };
649 
650     /// \brief The number of predefined type IDs that are reserved for
651     /// the PREDEF_TYPE_* constants.
652     ///
653     /// Type IDs for non-predefined types will start at
654     /// NUM_PREDEF_TYPE_IDs.
655     const unsigned NUM_PREDEF_TYPE_IDS = 100;
656 
657     /// \brief The number of allowed abbreviations in bits
658     const unsigned NUM_ALLOWED_ABBREVS_SIZE = 4;
659 
660     /// \brief Record codes for each kind of type.
661     ///
662     /// These constants describe the type records that can occur within a
663     /// block identified by DECLTYPES_BLOCK_ID in the AST file. Each
664     /// constant describes a record for a specific type class in the
665     /// AST.
666     enum TypeCode {
667       /// \brief An ExtQualType record.
668       TYPE_EXT_QUAL                 = 1,
669       /// \brief A ComplexType record.
670       TYPE_COMPLEX                  = 3,
671       /// \brief A PointerType record.
672       TYPE_POINTER                  = 4,
673       /// \brief A BlockPointerType record.
674       TYPE_BLOCK_POINTER            = 5,
675       /// \brief An LValueReferenceType record.
676       TYPE_LVALUE_REFERENCE         = 6,
677       /// \brief An RValueReferenceType record.
678       TYPE_RVALUE_REFERENCE         = 7,
679       /// \brief A MemberPointerType record.
680       TYPE_MEMBER_POINTER           = 8,
681       /// \brief A ConstantArrayType record.
682       TYPE_CONSTANT_ARRAY           = 9,
683       /// \brief An IncompleteArrayType record.
684       TYPE_INCOMPLETE_ARRAY         = 10,
685       /// \brief A VariableArrayType record.
686       TYPE_VARIABLE_ARRAY           = 11,
687       /// \brief A VectorType record.
688       TYPE_VECTOR                   = 12,
689       /// \brief An ExtVectorType record.
690       TYPE_EXT_VECTOR               = 13,
691       /// \brief A FunctionNoProtoType record.
692       TYPE_FUNCTION_NO_PROTO        = 14,
693       /// \brief A FunctionProtoType record.
694       TYPE_FUNCTION_PROTO           = 15,
695       /// \brief A TypedefType record.
696       TYPE_TYPEDEF                  = 16,
697       /// \brief A TypeOfExprType record.
698       TYPE_TYPEOF_EXPR              = 17,
699       /// \brief A TypeOfType record.
700       TYPE_TYPEOF                   = 18,
701       /// \brief A RecordType record.
702       TYPE_RECORD                   = 19,
703       /// \brief An EnumType record.
704       TYPE_ENUM                     = 20,
705       /// \brief An ObjCInterfaceType record.
706       TYPE_OBJC_INTERFACE           = 21,
707       /// \brief An ObjCObjectPointerType record.
708       TYPE_OBJC_OBJECT_POINTER      = 22,
709       /// \brief a DecltypeType record.
710       TYPE_DECLTYPE                 = 23,
711       /// \brief An ElaboratedType record.
712       TYPE_ELABORATED               = 24,
713       /// \brief A SubstTemplateTypeParmType record.
714       TYPE_SUBST_TEMPLATE_TYPE_PARM = 25,
715       /// \brief An UnresolvedUsingType record.
716       TYPE_UNRESOLVED_USING         = 26,
717       /// \brief An InjectedClassNameType record.
718       TYPE_INJECTED_CLASS_NAME      = 27,
719       /// \brief An ObjCObjectType record.
720       TYPE_OBJC_OBJECT              = 28,
721       /// \brief An TemplateTypeParmType record.
722       TYPE_TEMPLATE_TYPE_PARM       = 29,
723       /// \brief An TemplateSpecializationType record.
724       TYPE_TEMPLATE_SPECIALIZATION  = 30,
725       /// \brief A DependentNameType record.
726       TYPE_DEPENDENT_NAME           = 31,
727       /// \brief A DependentTemplateSpecializationType record.
728       TYPE_DEPENDENT_TEMPLATE_SPECIALIZATION = 32,
729       /// \brief A DependentSizedArrayType record.
730       TYPE_DEPENDENT_SIZED_ARRAY    = 33,
731       /// \brief A ParenType record.
732       TYPE_PAREN                    = 34,
733       /// \brief A PackExpansionType record.
734       TYPE_PACK_EXPANSION           = 35,
735       /// \brief An AttributedType record.
736       TYPE_ATTRIBUTED               = 36,
737       /// \brief A SubstTemplateTypeParmPackType record.
738       TYPE_SUBST_TEMPLATE_TYPE_PARM_PACK = 37,
739       /// \brief A AutoType record.
740       TYPE_AUTO                  = 38,
741       /// \brief A UnaryTransformType record.
742       TYPE_UNARY_TRANSFORM       = 39,
743       /// \brief An AtomicType record.
744       TYPE_ATOMIC                = 40
745     };
746 
747     /// \brief The type IDs for special types constructed by semantic
748     /// analysis.
749     ///
750     /// The constants in this enumeration are indices into the
751     /// SPECIAL_TYPES record.
752     enum SpecialTypeIDs {
753       /// \brief CFConstantString type
754       SPECIAL_TYPE_CF_CONSTANT_STRING          = 0,
755       /// \brief C FILE typedef type
756       SPECIAL_TYPE_FILE                        = 1,
757       /// \brief C jmp_buf typedef type
758       SPECIAL_TYPE_JMP_BUF                     = 2,
759       /// \brief C sigjmp_buf typedef type
760       SPECIAL_TYPE_SIGJMP_BUF                  = 3,
761       /// \brief Objective-C "id" redefinition type
762       SPECIAL_TYPE_OBJC_ID_REDEFINITION        = 4,
763       /// \brief Objective-C "Class" redefinition type
764       SPECIAL_TYPE_OBJC_CLASS_REDEFINITION     = 5,
765       /// \brief Objective-C "SEL" redefinition type
766       SPECIAL_TYPE_OBJC_SEL_REDEFINITION       = 6,
767       /// \brief C ucontext_t typedef type
768       SPECIAL_TYPE_UCONTEXT_T                  = 7
769     };
770 
771     /// \brief The number of special type IDs.
772     const unsigned NumSpecialTypeIDs = 8;
773 
774     /// \brief Predefined declaration IDs.
775     ///
776     /// These declaration IDs correspond to predefined declarations in the AST
777     /// context, such as the NULL declaration ID. Such declarations are never
778     /// actually serialized, since they will be built by the AST context when
779     /// it is created.
780     enum PredefinedDeclIDs {
781       /// \brief The NULL declaration.
782       PREDEF_DECL_NULL_ID       = 0,
783 
784       /// \brief The translation unit.
785       PREDEF_DECL_TRANSLATION_UNIT_ID = 1,
786 
787       /// \brief The Objective-C 'id' type.
788       PREDEF_DECL_OBJC_ID_ID = 2,
789 
790       /// \brief The Objective-C 'SEL' type.
791       PREDEF_DECL_OBJC_SEL_ID = 3,
792 
793       /// \brief The Objective-C 'Class' type.
794       PREDEF_DECL_OBJC_CLASS_ID = 4,
795 
796       /// \brief The Objective-C 'Protocol' type.
797       PREDEF_DECL_OBJC_PROTOCOL_ID = 5,
798 
799       /// \brief The signed 128-bit integer type.
800       PREDEF_DECL_INT_128_ID = 6,
801 
802       /// \brief The unsigned 128-bit integer type.
803       PREDEF_DECL_UNSIGNED_INT_128_ID = 7,
804 
805       /// \brief The internal 'instancetype' typedef.
806       PREDEF_DECL_OBJC_INSTANCETYPE_ID = 8,
807 
808       /// \brief The internal '__builtin_va_list' typedef.
809       PREDEF_DECL_BUILTIN_VA_LIST_ID = 9
810     };
811 
812     /// \brief The number of declaration IDs that are predefined.
813     ///
814     /// For more information about predefined declarations, see the
815     /// \c PredefinedDeclIDs type and the PREDEF_DECL_*_ID constants.
816     const unsigned int NUM_PREDEF_DECL_IDS = 10;
817 
818     /// \brief Record codes for each kind of declaration.
819     ///
820     /// These constants describe the declaration records that can occur within
821     /// a declarations block (identified by DECLS_BLOCK_ID). Each
822     /// constant describes a record for a specific declaration class
823     /// in the AST.
824     enum DeclCode {
825       /// \brief A TypedefDecl record.
826       DECL_TYPEDEF = 51,
827       /// \brief A TypeAliasDecl record.
828       DECL_TYPEALIAS,
829       /// \brief An EnumDecl record.
830       DECL_ENUM,
831       /// \brief A RecordDecl record.
832       DECL_RECORD,
833       /// \brief An EnumConstantDecl record.
834       DECL_ENUM_CONSTANT,
835       /// \brief A FunctionDecl record.
836       DECL_FUNCTION,
837       /// \brief A ObjCMethodDecl record.
838       DECL_OBJC_METHOD,
839       /// \brief A ObjCInterfaceDecl record.
840       DECL_OBJC_INTERFACE,
841       /// \brief A ObjCProtocolDecl record.
842       DECL_OBJC_PROTOCOL,
843       /// \brief A ObjCIvarDecl record.
844       DECL_OBJC_IVAR,
845       /// \brief A ObjCAtDefsFieldDecl record.
846       DECL_OBJC_AT_DEFS_FIELD,
847       /// \brief A ObjCCategoryDecl record.
848       DECL_OBJC_CATEGORY,
849       /// \brief A ObjCCategoryImplDecl record.
850       DECL_OBJC_CATEGORY_IMPL,
851       /// \brief A ObjCImplementationDecl record.
852       DECL_OBJC_IMPLEMENTATION,
853       /// \brief A ObjCCompatibleAliasDecl record.
854       DECL_OBJC_COMPATIBLE_ALIAS,
855       /// \brief A ObjCPropertyDecl record.
856       DECL_OBJC_PROPERTY,
857       /// \brief A ObjCPropertyImplDecl record.
858       DECL_OBJC_PROPERTY_IMPL,
859       /// \brief A FieldDecl record.
860       DECL_FIELD,
861       /// \brief A VarDecl record.
862       DECL_VAR,
863       /// \brief An ImplicitParamDecl record.
864       DECL_IMPLICIT_PARAM,
865       /// \brief A ParmVarDecl record.
866       DECL_PARM_VAR,
867       /// \brief A FileScopeAsmDecl record.
868       DECL_FILE_SCOPE_ASM,
869       /// \brief A BlockDecl record.
870       DECL_BLOCK,
871       /// \brief A record that stores the set of declarations that are
872       /// lexically stored within a given DeclContext.
873       ///
874       /// The record itself is a blob that is an array of declaration IDs,
875       /// in the order in which those declarations were added to the
876       /// declaration context. This data is used when iterating over
877       /// the contents of a DeclContext, e.g., via
878       /// DeclContext::decls_begin() and DeclContext::decls_end().
879       DECL_CONTEXT_LEXICAL,
880       /// \brief A record that stores the set of declarations that are
881       /// visible from a given DeclContext.
882       ///
883       /// The record itself stores a set of mappings, each of which
884       /// associates a declaration name with one or more declaration
885       /// IDs. This data is used when performing qualified name lookup
886       /// into a DeclContext via DeclContext::lookup.
887       DECL_CONTEXT_VISIBLE,
888       /// \brief A LabelDecl record.
889       DECL_LABEL,
890       /// \brief A NamespaceDecl record.
891       DECL_NAMESPACE,
892       /// \brief A NamespaceAliasDecl record.
893       DECL_NAMESPACE_ALIAS,
894       /// \brief A UsingDecl record.
895       DECL_USING,
896       /// \brief A UsingShadowDecl record.
897       DECL_USING_SHADOW,
898       /// \brief A UsingDirecitveDecl record.
899       DECL_USING_DIRECTIVE,
900       /// \brief An UnresolvedUsingValueDecl record.
901       DECL_UNRESOLVED_USING_VALUE,
902       /// \brief An UnresolvedUsingTypenameDecl record.
903       DECL_UNRESOLVED_USING_TYPENAME,
904       /// \brief A LinkageSpecDecl record.
905       DECL_LINKAGE_SPEC,
906       /// \brief A CXXRecordDecl record.
907       DECL_CXX_RECORD,
908       /// \brief A CXXMethodDecl record.
909       DECL_CXX_METHOD,
910       /// \brief A CXXConstructorDecl record.
911       DECL_CXX_CONSTRUCTOR,
912       /// \brief A CXXDestructorDecl record.
913       DECL_CXX_DESTRUCTOR,
914       /// \brief A CXXConversionDecl record.
915       DECL_CXX_CONVERSION,
916       /// \brief An AccessSpecDecl record.
917       DECL_ACCESS_SPEC,
918 
919       /// \brief A FriendDecl record.
920       DECL_FRIEND,
921       /// \brief A FriendTemplateDecl record.
922       DECL_FRIEND_TEMPLATE,
923       /// \brief A ClassTemplateDecl record.
924       DECL_CLASS_TEMPLATE,
925       /// \brief A ClassTemplateSpecializationDecl record.
926       DECL_CLASS_TEMPLATE_SPECIALIZATION,
927       /// \brief A ClassTemplatePartialSpecializationDecl record.
928       DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION,
929       /// \brief A FunctionTemplateDecl record.
930       DECL_FUNCTION_TEMPLATE,
931       /// \brief A TemplateTypeParmDecl record.
932       DECL_TEMPLATE_TYPE_PARM,
933       /// \brief A NonTypeTemplateParmDecl record.
934       DECL_NON_TYPE_TEMPLATE_PARM,
935       /// \brief A TemplateTemplateParmDecl record.
936       DECL_TEMPLATE_TEMPLATE_PARM,
937       /// \brief A TypeAliasTemplateDecl record.
938       DECL_TYPE_ALIAS_TEMPLATE,
939       /// \brief A StaticAssertDecl record.
940       DECL_STATIC_ASSERT,
941       /// \brief A record containing CXXBaseSpecifiers.
942       DECL_CXX_BASE_SPECIFIERS,
943       /// \brief A IndirectFieldDecl record.
944       DECL_INDIRECTFIELD,
945       /// \brief A NonTypeTemplateParmDecl record that stores an expanded
946       /// non-type template parameter pack.
947       DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK,
948       /// \brief A TemplateTemplateParmDecl record that stores an expanded
949       /// template template parameter pack.
950       DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK,
951       /// \brief A ClassScopeFunctionSpecializationDecl record a class scope
952       /// function specialization. (Microsoft extension).
953       DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION,
954       /// \brief An ImportDecl recording a module import.
955       DECL_IMPORT
956     };
957 
958     /// \brief Record codes for each kind of statement or expression.
959     ///
960     /// These constants describe the records that describe statements
961     /// or expressions. These records  occur within type and declarations
962     /// block, so they begin with record values of 100.  Each constant
963     /// describes a record for a specific statement or expression class in the
964     /// AST.
965     enum StmtCode {
966       /// \brief A marker record that indicates that we are at the end
967       /// of an expression.
968       STMT_STOP = 100,
969       /// \brief A NULL expression.
970       STMT_NULL_PTR,
971       /// \brief A reference to a previously [de]serialized Stmt record.
972       STMT_REF_PTR,
973       /// \brief A NullStmt record.
974       STMT_NULL,
975       /// \brief A CompoundStmt record.
976       STMT_COMPOUND,
977       /// \brief A CaseStmt record.
978       STMT_CASE,
979       /// \brief A DefaultStmt record.
980       STMT_DEFAULT,
981       /// \brief A LabelStmt record.
982       STMT_LABEL,
983       /// \brief An AttributedStmt record.
984       STMT_ATTRIBUTED,
985       /// \brief An IfStmt record.
986       STMT_IF,
987       /// \brief A SwitchStmt record.
988       STMT_SWITCH,
989       /// \brief A WhileStmt record.
990       STMT_WHILE,
991       /// \brief A DoStmt record.
992       STMT_DO,
993       /// \brief A ForStmt record.
994       STMT_FOR,
995       /// \brief A GotoStmt record.
996       STMT_GOTO,
997       /// \brief An IndirectGotoStmt record.
998       STMT_INDIRECT_GOTO,
999       /// \brief A ContinueStmt record.
1000       STMT_CONTINUE,
1001       /// \brief A BreakStmt record.
1002       STMT_BREAK,
1003       /// \brief A ReturnStmt record.
1004       STMT_RETURN,
1005       /// \brief A DeclStmt record.
1006       STMT_DECL,
1007       /// \brief A GCC-style AsmStmt record.
1008       STMT_GCCASM,
1009       /// \brief A MS-style AsmStmt record.
1010       STMT_MSASM,
1011       /// \brief A PredefinedExpr record.
1012       EXPR_PREDEFINED,
1013       /// \brief A DeclRefExpr record.
1014       EXPR_DECL_REF,
1015       /// \brief An IntegerLiteral record.
1016       EXPR_INTEGER_LITERAL,
1017       /// \brief A FloatingLiteral record.
1018       EXPR_FLOATING_LITERAL,
1019       /// \brief An ImaginaryLiteral record.
1020       EXPR_IMAGINARY_LITERAL,
1021       /// \brief A StringLiteral record.
1022       EXPR_STRING_LITERAL,
1023       /// \brief A CharacterLiteral record.
1024       EXPR_CHARACTER_LITERAL,
1025       /// \brief A ParenExpr record.
1026       EXPR_PAREN,
1027       /// \brief A ParenListExpr record.
1028       EXPR_PAREN_LIST,
1029       /// \brief A UnaryOperator record.
1030       EXPR_UNARY_OPERATOR,
1031       /// \brief An OffsetOfExpr record.
1032       EXPR_OFFSETOF,
1033       /// \brief A SizefAlignOfExpr record.
1034       EXPR_SIZEOF_ALIGN_OF,
1035       /// \brief An ArraySubscriptExpr record.
1036       EXPR_ARRAY_SUBSCRIPT,
1037       /// \brief A CallExpr record.
1038       EXPR_CALL,
1039       /// \brief A MemberExpr record.
1040       EXPR_MEMBER,
1041       /// \brief A BinaryOperator record.
1042       EXPR_BINARY_OPERATOR,
1043       /// \brief A CompoundAssignOperator record.
1044       EXPR_COMPOUND_ASSIGN_OPERATOR,
1045       /// \brief A ConditionOperator record.
1046       EXPR_CONDITIONAL_OPERATOR,
1047       /// \brief An ImplicitCastExpr record.
1048       EXPR_IMPLICIT_CAST,
1049       /// \brief A CStyleCastExpr record.
1050       EXPR_CSTYLE_CAST,
1051       /// \brief A CompoundLiteralExpr record.
1052       EXPR_COMPOUND_LITERAL,
1053       /// \brief An ExtVectorElementExpr record.
1054       EXPR_EXT_VECTOR_ELEMENT,
1055       /// \brief An InitListExpr record.
1056       EXPR_INIT_LIST,
1057       /// \brief A DesignatedInitExpr record.
1058       EXPR_DESIGNATED_INIT,
1059       /// \brief An ImplicitValueInitExpr record.
1060       EXPR_IMPLICIT_VALUE_INIT,
1061       /// \brief A VAArgExpr record.
1062       EXPR_VA_ARG,
1063       /// \brief An AddrLabelExpr record.
1064       EXPR_ADDR_LABEL,
1065       /// \brief A StmtExpr record.
1066       EXPR_STMT,
1067       /// \brief A ChooseExpr record.
1068       EXPR_CHOOSE,
1069       /// \brief A GNUNullExpr record.
1070       EXPR_GNU_NULL,
1071       /// \brief A ShuffleVectorExpr record.
1072       EXPR_SHUFFLE_VECTOR,
1073       /// \brief BlockExpr
1074       EXPR_BLOCK,
1075       /// \brief A GenericSelectionExpr record.
1076       EXPR_GENERIC_SELECTION,
1077       /// \brief A PseudoObjectExpr record.
1078       EXPR_PSEUDO_OBJECT,
1079       /// \brief An AtomicExpr record.
1080       EXPR_ATOMIC,
1081 
1082       // Objective-C
1083 
1084       /// \brief An ObjCStringLiteral record.
1085       EXPR_OBJC_STRING_LITERAL,
1086 
1087       EXPR_OBJC_BOXED_EXPRESSION,
1088       EXPR_OBJC_ARRAY_LITERAL,
1089       EXPR_OBJC_DICTIONARY_LITERAL,
1090 
1091 
1092       /// \brief An ObjCEncodeExpr record.
1093       EXPR_OBJC_ENCODE,
1094       /// \brief An ObjCSelectorExpr record.
1095       EXPR_OBJC_SELECTOR_EXPR,
1096       /// \brief An ObjCProtocolExpr record.
1097       EXPR_OBJC_PROTOCOL_EXPR,
1098       /// \brief An ObjCIvarRefExpr record.
1099       EXPR_OBJC_IVAR_REF_EXPR,
1100       /// \brief An ObjCPropertyRefExpr record.
1101       EXPR_OBJC_PROPERTY_REF_EXPR,
1102       /// \brief An ObjCSubscriptRefExpr record.
1103       EXPR_OBJC_SUBSCRIPT_REF_EXPR,
1104       /// \brief UNUSED
1105       EXPR_OBJC_KVC_REF_EXPR,
1106       /// \brief An ObjCMessageExpr record.
1107       EXPR_OBJC_MESSAGE_EXPR,
1108       /// \brief An ObjCIsa Expr record.
1109       EXPR_OBJC_ISA,
1110       /// \brief An ObjCIndirectCopyRestoreExpr record.
1111       EXPR_OBJC_INDIRECT_COPY_RESTORE,
1112 
1113       /// \brief An ObjCForCollectionStmt record.
1114       STMT_OBJC_FOR_COLLECTION,
1115       /// \brief An ObjCAtCatchStmt record.
1116       STMT_OBJC_CATCH,
1117       /// \brief An ObjCAtFinallyStmt record.
1118       STMT_OBJC_FINALLY,
1119       /// \brief An ObjCAtTryStmt record.
1120       STMT_OBJC_AT_TRY,
1121       /// \brief An ObjCAtSynchronizedStmt record.
1122       STMT_OBJC_AT_SYNCHRONIZED,
1123       /// \brief An ObjCAtThrowStmt record.
1124       STMT_OBJC_AT_THROW,
1125       /// \brief An ObjCAutoreleasePoolStmt record.
1126       STMT_OBJC_AUTORELEASE_POOL,
1127       /// \brief A ObjCBoolLiteralExpr record.
1128       EXPR_OBJC_BOOL_LITERAL,
1129 
1130       // C++
1131 
1132       /// \brief A CXXCatchStmt record.
1133       STMT_CXX_CATCH,
1134       /// \brief A CXXTryStmt record.
1135       STMT_CXX_TRY,
1136       /// \brief A CXXForRangeStmt record.
1137       STMT_CXX_FOR_RANGE,
1138 
1139       /// \brief A CXXOperatorCallExpr record.
1140       EXPR_CXX_OPERATOR_CALL,
1141       /// \brief A CXXMemberCallExpr record.
1142       EXPR_CXX_MEMBER_CALL,
1143       /// \brief A CXXConstructExpr record.
1144       EXPR_CXX_CONSTRUCT,
1145       /// \brief A CXXTemporaryObjectExpr record.
1146       EXPR_CXX_TEMPORARY_OBJECT,
1147       /// \brief A CXXStaticCastExpr record.
1148       EXPR_CXX_STATIC_CAST,
1149       /// \brief A CXXDynamicCastExpr record.
1150       EXPR_CXX_DYNAMIC_CAST,
1151       /// \brief A CXXReinterpretCastExpr record.
1152       EXPR_CXX_REINTERPRET_CAST,
1153       /// \brief A CXXConstCastExpr record.
1154       EXPR_CXX_CONST_CAST,
1155       /// \brief A CXXFunctionalCastExpr record.
1156       EXPR_CXX_FUNCTIONAL_CAST,
1157       /// \brief A UserDefinedLiteral record.
1158       EXPR_USER_DEFINED_LITERAL,
1159       /// \brief A CXXBoolLiteralExpr record.
1160       EXPR_CXX_BOOL_LITERAL,
1161       EXPR_CXX_NULL_PTR_LITERAL,  // CXXNullPtrLiteralExpr
1162       EXPR_CXX_TYPEID_EXPR,       // CXXTypeidExpr (of expr).
1163       EXPR_CXX_TYPEID_TYPE,       // CXXTypeidExpr (of type).
1164       EXPR_CXX_THIS,              // CXXThisExpr
1165       EXPR_CXX_THROW,             // CXXThrowExpr
1166       EXPR_CXX_DEFAULT_ARG,       // CXXDefaultArgExpr
1167       EXPR_CXX_BIND_TEMPORARY,    // CXXBindTemporaryExpr
1168 
1169       EXPR_CXX_SCALAR_VALUE_INIT, // CXXScalarValueInitExpr
1170       EXPR_CXX_NEW,               // CXXNewExpr
1171       EXPR_CXX_DELETE,            // CXXDeleteExpr
1172       EXPR_CXX_PSEUDO_DESTRUCTOR, // CXXPseudoDestructorExpr
1173 
1174       EXPR_EXPR_WITH_CLEANUPS,    // ExprWithCleanups
1175 
1176       EXPR_CXX_DEPENDENT_SCOPE_MEMBER,   // CXXDependentScopeMemberExpr
1177       EXPR_CXX_DEPENDENT_SCOPE_DECL_REF, // DependentScopeDeclRefExpr
1178       EXPR_CXX_UNRESOLVED_CONSTRUCT,     // CXXUnresolvedConstructExpr
1179       EXPR_CXX_UNRESOLVED_MEMBER,        // UnresolvedMemberExpr
1180       EXPR_CXX_UNRESOLVED_LOOKUP,        // UnresolvedLookupExpr
1181 
1182       EXPR_CXX_UNARY_TYPE_TRAIT,  // UnaryTypeTraitExpr
1183       EXPR_CXX_EXPRESSION_TRAIT,  // ExpressionTraitExpr
1184       EXPR_CXX_NOEXCEPT,          // CXXNoexceptExpr
1185 
1186       EXPR_OPAQUE_VALUE,          // OpaqueValueExpr
1187       EXPR_BINARY_CONDITIONAL_OPERATOR,  // BinaryConditionalOperator
1188       EXPR_BINARY_TYPE_TRAIT,     // BinaryTypeTraitExpr
1189       EXPR_TYPE_TRAIT,            // TypeTraitExpr
1190       EXPR_ARRAY_TYPE_TRAIT,      // ArrayTypeTraitIntExpr
1191 
1192       EXPR_PACK_EXPANSION,        // PackExpansionExpr
1193       EXPR_SIZEOF_PACK,           // SizeOfPackExpr
1194       EXPR_SUBST_NON_TYPE_TEMPLATE_PARM, // SubstNonTypeTemplateParmExpr
1195       EXPR_SUBST_NON_TYPE_TEMPLATE_PARM_PACK,// SubstNonTypeTemplateParmPackExpr
1196       EXPR_MATERIALIZE_TEMPORARY, // MaterializeTemporaryExpr
1197 
1198       // CUDA
1199       EXPR_CUDA_KERNEL_CALL,       // CUDAKernelCallExpr
1200 
1201       // OpenCL
1202       EXPR_ASTYPE,                 // AsTypeExpr
1203 
1204       // Microsoft
1205       EXPR_CXX_UUIDOF_EXPR,       // CXXUuidofExpr (of expr).
1206       EXPR_CXX_UUIDOF_TYPE,       // CXXUuidofExpr (of type).
1207       STMT_SEH_EXCEPT,            // SEHExceptStmt
1208       STMT_SEH_FINALLY,           // SEHFinallyStmt
1209       STMT_SEH_TRY,               // SEHTryStmt
1210 
1211       // ARC
1212       EXPR_OBJC_BRIDGED_CAST,     // ObjCBridgedCastExpr
1213 
1214       STMT_MS_DEPENDENT_EXISTS,   // MSDependentExistsStmt
1215       EXPR_LAMBDA                 // LambdaExpr
1216     };
1217 
1218     /// \brief The kinds of designators that can occur in a
1219     /// DesignatedInitExpr.
1220     enum DesignatorTypes {
1221       /// \brief Field designator where only the field name is known.
1222       DESIG_FIELD_NAME  = 0,
1223       /// \brief Field designator where the field has been resolved to
1224       /// a declaration.
1225       DESIG_FIELD_DECL  = 1,
1226       /// \brief Array designator.
1227       DESIG_ARRAY       = 2,
1228       /// \brief GNU array range designator.
1229       DESIG_ARRAY_RANGE = 3
1230     };
1231 
1232     /// \brief The different kinds of data that can occur in a
1233     /// CtorInitializer.
1234     enum CtorInitializerType {
1235       CTOR_INITIALIZER_BASE,
1236       CTOR_INITIALIZER_DELEGATING,
1237       CTOR_INITIALIZER_MEMBER,
1238       CTOR_INITIALIZER_INDIRECT_MEMBER
1239     };
1240 
1241     /// \brief Describes the redeclarations of a declaration.
1242     struct LocalRedeclarationsInfo {
1243       DeclID FirstID;      // The ID of the first declaration
1244       unsigned Offset;     // Offset into the array of redeclaration chains.
1245 
1246       friend bool operator<(const LocalRedeclarationsInfo &X,
1247                             const LocalRedeclarationsInfo &Y) {
1248         return X.FirstID < Y.FirstID;
1249       }
1250 
1251       friend bool operator>(const LocalRedeclarationsInfo &X,
1252                             const LocalRedeclarationsInfo &Y) {
1253         return X.FirstID > Y.FirstID;
1254       }
1255 
1256       friend bool operator<=(const LocalRedeclarationsInfo &X,
1257                              const LocalRedeclarationsInfo &Y) {
1258         return X.FirstID <= Y.FirstID;
1259       }
1260 
1261       friend bool operator>=(const LocalRedeclarationsInfo &X,
1262                              const LocalRedeclarationsInfo &Y) {
1263         return X.FirstID >= Y.FirstID;
1264       }
1265     };
1266 
1267     /// \brief Describes the categories of an Objective-C class.
1268     struct ObjCCategoriesInfo {
1269       DeclID DefinitionID; // The ID of the definition
1270       unsigned Offset;     // Offset into the array of category lists.
1271 
1272       friend bool operator<(const ObjCCategoriesInfo &X,
1273                             const ObjCCategoriesInfo &Y) {
1274         return X.DefinitionID < Y.DefinitionID;
1275       }
1276 
1277       friend bool operator>(const ObjCCategoriesInfo &X,
1278                             const ObjCCategoriesInfo &Y) {
1279         return X.DefinitionID > Y.DefinitionID;
1280       }
1281 
1282       friend bool operator<=(const ObjCCategoriesInfo &X,
1283                              const ObjCCategoriesInfo &Y) {
1284         return X.DefinitionID <= Y.DefinitionID;
1285       }
1286 
1287       friend bool operator>=(const ObjCCategoriesInfo &X,
1288                              const ObjCCategoriesInfo &Y) {
1289         return X.DefinitionID >= Y.DefinitionID;
1290       }
1291     };
1292 
1293     /// @}
1294   }
1295 } // end namespace clang
1296 
1297 #endif
1298