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/DeclarationName.h"
21 #include "clang/AST/Type.h"
22 #include "llvm/ADT/DenseMap.h"
23 #include "llvm/Bitcode/BitCodes.h"
24 #include "llvm/Support/DataTypes.h"
25 
26 namespace clang {
27   namespace serialization {
28     /// \brief AST file major version number supported by this version of
29     /// Clang.
30     ///
31     /// Whenever the AST file format changes in a way that makes it
32     /// incompatible with previous versions (such that a reader
33     /// designed for the previous version could not support reading
34     /// the new version), this number should be increased.
35     ///
36     /// Version 4 of AST files also requires that the version control branch and
37     /// revision match exactly, since there is no backward compatibility of
38     /// AST files at this time.
39     const unsigned VERSION_MAJOR = 6;
40 
41     /// \brief AST file minor version number supported by this version of
42     /// Clang.
43     ///
44     /// Whenever the AST format changes in a way that is still
45     /// compatible with previous versions (such that a reader designed
46     /// for the previous version could still support reading the new
47     /// version by ignoring new kinds of subblocks), this number
48     /// should be increased.
49     const unsigned VERSION_MINOR = 0;
50 
51     /// \brief An ID number that refers to an identifier in an AST file.
52     ///
53     /// The ID numbers of identifiers are consecutive (in order of discovery)
54     /// and start at 1. 0 is reserved for NULL.
55     typedef uint32_t IdentifierID;
56 
57     /// \brief An ID number that refers to a declaration in an AST file.
58     ///
59     /// The ID numbers of declarations are consecutive (in order of
60     /// discovery), with values below NUM_PREDEF_DECL_IDS being reserved.
61     /// At the start of a chain of precompiled headers, declaration ID 1 is
62     /// used for the translation unit declaration.
63     typedef uint32_t DeclID;
64 
65     // FIXME: Turn these into classes so we can have some type safety when
66     // we go from local ID to global and vice-versa.
67     typedef DeclID LocalDeclID;
68     typedef DeclID GlobalDeclID;
69 
70     /// \brief An ID number that refers to a type in an AST file.
71     ///
72     /// The ID of a type is partitioned into two parts: the lower
73     /// three bits are used to store the const/volatile/restrict
74     /// qualifiers (as with QualType) and the upper bits provide a
75     /// type index. The type index values are partitioned into two
76     /// sets. The values below NUM_PREDEF_TYPE_IDs are predefined type
77     /// IDs (based on the PREDEF_TYPE_*_ID constants), with 0 as a
78     /// placeholder for "no type". Values from NUM_PREDEF_TYPE_IDs are
79     /// other types that have serialized representations.
80     typedef uint32_t TypeID;
81 
82     /// \brief A type index; the type ID with the qualifier bits removed.
83     class TypeIdx {
84       uint32_t Idx;
85     public:
TypeIdx()86       TypeIdx() : Idx(0) { }
TypeIdx(uint32_t index)87       explicit TypeIdx(uint32_t index) : Idx(index) { }
88 
getIndex()89       uint32_t getIndex() const { return Idx; }
asTypeID(unsigned FastQuals)90       TypeID asTypeID(unsigned FastQuals) const {
91         if (Idx == uint32_t(-1))
92           return TypeID(-1);
93 
94         return (Idx << Qualifiers::FastWidth) | FastQuals;
95       }
fromTypeID(TypeID ID)96       static TypeIdx fromTypeID(TypeID ID) {
97         if (ID == TypeID(-1))
98           return TypeIdx(-1);
99 
100         return TypeIdx(ID >> Qualifiers::FastWidth);
101       }
102     };
103 
104     /// A structure for putting "fast"-unqualified QualTypes into a
105     /// DenseMap.  This uses the standard pointer hash function.
106     struct UnsafeQualTypeDenseMapInfo {
isEqualUnsafeQualTypeDenseMapInfo107       static inline bool isEqual(QualType A, QualType B) { return A == B; }
getEmptyKeyUnsafeQualTypeDenseMapInfo108       static inline QualType getEmptyKey() {
109         return QualType::getFromOpaquePtr((void*) 1);
110       }
getTombstoneKeyUnsafeQualTypeDenseMapInfo111       static inline QualType getTombstoneKey() {
112         return QualType::getFromOpaquePtr((void*) 2);
113       }
getHashValueUnsafeQualTypeDenseMapInfo114       static inline unsigned getHashValue(QualType T) {
115         assert(!T.getLocalFastQualifiers() &&
116                "hash invalid for types with fast quals");
117         uintptr_t v = reinterpret_cast<uintptr_t>(T.getAsOpaquePtr());
118         return (unsigned(v) >> 4) ^ (unsigned(v) >> 9);
119       }
120     };
121 
122     /// \brief An ID number that refers to an identifier in an AST file.
123     typedef uint32_t IdentID;
124 
125     /// \brief The number of predefined identifier IDs.
126     const unsigned int NUM_PREDEF_IDENT_IDS = 1;
127 
128     /// \brief An ID number that refers to a macro in an AST file.
129     typedef uint32_t MacroID;
130 
131     /// \brief A global ID number that refers to a macro in an AST file.
132     typedef uint32_t GlobalMacroID;
133 
134     /// \brief A local to a module ID number that refers to a macro in an
135     /// AST file.
136     typedef uint32_t LocalMacroID;
137 
138     /// \brief The number of predefined macro IDs.
139     const unsigned int NUM_PREDEF_MACRO_IDS = 1;
140 
141     /// \brief An ID number that refers to an ObjC selector in an AST file.
142     typedef uint32_t SelectorID;
143 
144     /// \brief The number of predefined selector IDs.
145     const unsigned int NUM_PREDEF_SELECTOR_IDS = 1;
146 
147     /// \brief An ID number that refers to a set of CXXBaseSpecifiers in an
148     /// AST file.
149     typedef uint32_t CXXBaseSpecifiersID;
150 
151     /// \brief An ID number that refers to a list of CXXCtorInitializers in an
152     /// AST file.
153     typedef uint32_t CXXCtorInitializersID;
154 
155     /// \brief An ID number that refers to an entity in the detailed
156     /// preprocessing record.
157     typedef uint32_t PreprocessedEntityID;
158 
159     /// \brief An ID number that refers to a submodule in a module file.
160     typedef uint32_t SubmoduleID;
161 
162     /// \brief The number of predefined submodule IDs.
163     const unsigned int NUM_PREDEF_SUBMODULE_IDS = 1;
164 
165     /// \brief Source range/offset of a preprocessed entity.
166     struct PPEntityOffset {
167       /// \brief Raw source location of beginning of range.
168       unsigned Begin;
169       /// \brief Raw source location of end of range.
170       unsigned End;
171       /// \brief Offset in the AST file.
172       uint32_t BitOffset;
173 
PPEntityOffsetPPEntityOffset174       PPEntityOffset(SourceRange R, uint32_t BitOffset)
175         : Begin(R.getBegin().getRawEncoding()),
176           End(R.getEnd().getRawEncoding()),
177           BitOffset(BitOffset) { }
178     };
179 
180     /// \brief Source range/offset of a preprocessed entity.
181     struct DeclOffset {
182       /// \brief Raw source location.
183       unsigned Loc;
184       /// \brief Offset in the AST file.
185       uint32_t BitOffset;
186 
DeclOffsetDeclOffset187       DeclOffset() : Loc(0), BitOffset(0) { }
DeclOffsetDeclOffset188       DeclOffset(SourceLocation Loc, uint32_t BitOffset)
189         : Loc(Loc.getRawEncoding()),
190           BitOffset(BitOffset) { }
setLocationDeclOffset191       void setLocation(SourceLocation L) {
192         Loc = L.getRawEncoding();
193       }
194     };
195 
196     /// \brief The number of predefined preprocessed entity IDs.
197     const unsigned int NUM_PREDEF_PP_ENTITY_IDS = 1;
198 
199     /// \brief Describes the various kinds of blocks that occur within
200     /// an AST file.
201     enum BlockIDs {
202       /// \brief The AST block, which acts as a container around the
203       /// full AST block.
204       AST_BLOCK_ID = llvm::bitc::FIRST_APPLICATION_BLOCKID,
205 
206       /// \brief The block containing information about the source
207       /// manager.
208       SOURCE_MANAGER_BLOCK_ID,
209 
210       /// \brief The block containing information about the
211       /// preprocessor.
212       PREPROCESSOR_BLOCK_ID,
213 
214       /// \brief The block containing the definitions of all of the
215       /// types and decls used within the AST file.
216       DECLTYPES_BLOCK_ID,
217 
218       /// \brief The block containing the detailed preprocessing record.
219       PREPROCESSOR_DETAIL_BLOCK_ID,
220 
221       /// \brief The block containing the submodule structure.
222       SUBMODULE_BLOCK_ID,
223 
224       /// \brief The block containing comments.
225       COMMENTS_BLOCK_ID,
226 
227       /// \brief The control block, which contains all of the
228       /// information that needs to be validated prior to committing
229       /// to loading the AST file.
230       CONTROL_BLOCK_ID,
231 
232       /// \brief The block of input files, which were used as inputs
233       /// to create this AST file.
234       ///
235       /// This block is part of the control block.
236       INPUT_FILES_BLOCK_ID,
237 
238       /// \brief The block of configuration options, used to check that
239       /// a module is being used in a configuration compatible with the
240       /// configuration in which it was built.
241       ///
242       /// This block is part of the control block.
243       OPTIONS_BLOCK_ID,
244 
245       /// \brief A block containing a module file extension.
246       EXTENSION_BLOCK_ID,
247     };
248 
249     /// \brief Record types that occur within the control block.
250     enum ControlRecordTypes {
251       /// \brief AST file metadata, including the AST file version number
252       /// and information about the compiler used to build this AST file.
253       METADATA = 1,
254 
255       /// \brief Record code for the list of other AST files imported by
256       /// this AST file.
257       IMPORTS,
258 
259       /// \brief Record code for the original file that was used to
260       /// generate the AST file, including both its file ID and its
261       /// name.
262       ORIGINAL_FILE,
263 
264       /// \brief The directory that the PCH was originally created in.
265       ORIGINAL_PCH_DIR,
266 
267       /// \brief Record code for file ID of the file or buffer that was used to
268       /// generate the AST file.
269       ORIGINAL_FILE_ID,
270 
271       /// \brief Offsets into the input-files block where input files
272       /// reside.
273       INPUT_FILE_OFFSETS,
274 
275       /// \brief Record code for the module name.
276       MODULE_NAME,
277 
278       /// \brief Record code for the module map file that was used to build this
279       /// AST file.
280       MODULE_MAP_FILE,
281 
282       /// \brief Record code for the signature that identifiers this AST file.
283       SIGNATURE,
284 
285       /// \brief Record code for the module build directory.
286       MODULE_DIRECTORY,
287     };
288 
289     /// \brief Record types that occur within the options block inside
290     /// the control block.
291     enum OptionsRecordTypes {
292       /// \brief Record code for the language options table.
293       ///
294       /// The record with this code contains the contents of the
295       /// LangOptions structure. We serialize the entire contents of
296       /// the structure, and let the reader decide which options are
297       /// actually important to check.
298       LANGUAGE_OPTIONS = 1,
299 
300       /// \brief Record code for the target options table.
301       TARGET_OPTIONS,
302 
303       /// \brief Record code for the diagnostic options table.
304       DIAGNOSTIC_OPTIONS,
305 
306       /// \brief Record code for the filesystem options table.
307       FILE_SYSTEM_OPTIONS,
308 
309       /// \brief Record code for the headers search options table.
310       HEADER_SEARCH_OPTIONS,
311 
312       /// \brief Record code for the preprocessor options table.
313       PREPROCESSOR_OPTIONS,
314     };
315 
316     /// \brief Record code for extension blocks.
317     enum ExtensionBlockRecordTypes {
318       /// Metadata describing this particular extension.
319       EXTENSION_METADATA = 1,
320 
321       /// The first record ID allocated to the extensions themselves.
322       FIRST_EXTENSION_RECORD_ID = 4
323     };
324 
325     /// \brief Record types that occur within the input-files block
326     /// inside the control block.
327     enum InputFileRecordTypes {
328       /// \brief An input file.
329       INPUT_FILE = 1
330     };
331 
332     /// \brief Record types that occur within the AST block itself.
333     enum ASTRecordTypes {
334       /// \brief Record code for the offsets of each type.
335       ///
336       /// The TYPE_OFFSET constant describes the record that occurs
337       /// within the AST block. The record itself is an array of offsets that
338       /// point into the declarations and types block (identified by
339       /// DECLTYPES_BLOCK_ID). The index into the array is based on the ID
340       /// of a type. For a given type ID @c T, the lower three bits of
341       /// @c T are its qualifiers (const, volatile, restrict), as in
342       /// the QualType class. The upper bits, after being shifted and
343       /// subtracting NUM_PREDEF_TYPE_IDS, are used to index into the
344       /// TYPE_OFFSET block to determine the offset of that type's
345       /// corresponding record within the DECLTYPES_BLOCK_ID block.
346       TYPE_OFFSET = 1,
347 
348       /// \brief Record code for the offsets of each decl.
349       ///
350       /// The DECL_OFFSET constant describes the record that occurs
351       /// within the block identified by DECL_OFFSETS_BLOCK_ID within
352       /// the AST block. The record itself is an array of offsets that
353       /// point into the declarations and types block (identified by
354       /// DECLTYPES_BLOCK_ID). The declaration ID is an index into this
355       /// record, after subtracting one to account for the use of
356       /// declaration ID 0 for a NULL declaration pointer. Index 0 is
357       /// reserved for the translation unit declaration.
358       DECL_OFFSET = 2,
359 
360       /// \brief Record code for the table of offsets of each
361       /// identifier ID.
362       ///
363       /// The offset table contains offsets into the blob stored in
364       /// the IDENTIFIER_TABLE record. Each offset points to the
365       /// NULL-terminated string that corresponds to that identifier.
366       IDENTIFIER_OFFSET = 3,
367 
368       /// \brief This is so that older clang versions, before the introduction
369       /// of the control block, can read and reject the newer PCH format.
370       /// *DON'T CHANGE THIS NUMBER*.
371       METADATA_OLD_FORMAT = 4,
372 
373       /// \brief Record code for the identifier table.
374       ///
375       /// The identifier table is a simple blob that contains
376       /// NULL-terminated strings for all of the identifiers
377       /// referenced by the AST file. The IDENTIFIER_OFFSET table
378       /// contains the mapping from identifier IDs to the characters
379       /// in this blob. Note that the starting offsets of all of the
380       /// identifiers are odd, so that, when the identifier offset
381       /// table is loaded in, we can use the low bit to distinguish
382       /// between offsets (for unresolved identifier IDs) and
383       /// IdentifierInfo pointers (for already-resolved identifier
384       /// IDs).
385       IDENTIFIER_TABLE = 5,
386 
387       /// \brief Record code for the array of eagerly deserialized decls.
388       ///
389       /// The AST file contains a list of all of the declarations that should be
390       /// eagerly deserialized present within the parsed headers, stored as an
391       /// array of declaration IDs. These declarations will be
392       /// reported to the AST consumer after the AST file has been
393       /// read, since their presence can affect the semantics of the
394       /// program (e.g., for code generation).
395       EAGERLY_DESERIALIZED_DECLS = 6,
396 
397       /// \brief Record code for the set of non-builtin, special
398       /// types.
399       ///
400       /// This record contains the type IDs for the various type nodes
401       /// that are constructed during semantic analysis (e.g.,
402       /// __builtin_va_list). The SPECIAL_TYPE_* constants provide
403       /// offsets into this record.
404       SPECIAL_TYPES = 7,
405 
406       /// \brief Record code for the extra statistics we gather while
407       /// generating an AST file.
408       STATISTICS = 8,
409 
410       /// \brief Record code for the array of tentative definitions.
411       TENTATIVE_DEFINITIONS = 9,
412 
413       // ID 10 used to be for a list of extern "C" declarations.
414 
415       /// \brief Record code for the table of offsets into the
416       /// Objective-C method pool.
417       SELECTOR_OFFSETS = 11,
418 
419       /// \brief Record code for the Objective-C method pool,
420       METHOD_POOL = 12,
421 
422       /// \brief The value of the next __COUNTER__ to dispense.
423       /// [PP_COUNTER_VALUE, Val]
424       PP_COUNTER_VALUE = 13,
425 
426       /// \brief Record code for the table of offsets into the block
427       /// of source-location information.
428       SOURCE_LOCATION_OFFSETS = 14,
429 
430       /// \brief Record code for the set of source location entries
431       /// that need to be preloaded by the AST reader.
432       ///
433       /// This set contains the source location entry for the
434       /// predefines buffer and for any file entries that need to be
435       /// preloaded.
436       SOURCE_LOCATION_PRELOADS = 15,
437 
438       /// \brief Record code for the set of ext_vector type names.
439       EXT_VECTOR_DECLS = 16,
440 
441       /// \brief Record code for the array of unused file scoped decls.
442       UNUSED_FILESCOPED_DECLS = 17,
443 
444       /// \brief Record code for the table of offsets to entries in the
445       /// preprocessing record.
446       PPD_ENTITIES_OFFSETS = 18,
447 
448       /// \brief Record code for the array of VTable uses.
449       VTABLE_USES = 19,
450 
451       // ID 20 used to be for a list of dynamic classes.
452 
453       /// \brief Record code for referenced selector pool.
454       REFERENCED_SELECTOR_POOL = 21,
455 
456       /// \brief Record code for an update to the TU's lexically contained
457       /// declarations.
458       TU_UPDATE_LEXICAL = 22,
459 
460       // ID 23 used to be for a list of local redeclarations.
461 
462       /// \brief Record code for declarations that Sema keeps references of.
463       SEMA_DECL_REFS = 24,
464 
465       /// \brief Record code for weak undeclared identifiers.
466       WEAK_UNDECLARED_IDENTIFIERS = 25,
467 
468       /// \brief Record code for pending implicit instantiations.
469       PENDING_IMPLICIT_INSTANTIATIONS = 26,
470 
471       /// \brief Record code for a decl replacement block.
472       ///
473       /// If a declaration is modified after having been deserialized, and then
474       /// written to a dependent AST file, its ID and offset must be added to
475       /// the replacement block.
476       DECL_REPLACEMENTS = 27,
477 
478       /// \brief Record code for an update to a decl context's lookup table.
479       ///
480       /// In practice, this should only be used for the TU and namespaces.
481       UPDATE_VISIBLE = 28,
482 
483       /// \brief Record for offsets of DECL_UPDATES records for declarations
484       /// that were modified after being deserialized and need updates.
485       DECL_UPDATE_OFFSETS = 29,
486 
487       /// \brief Record of updates for a declaration that was modified after
488       /// being deserialized.
489       DECL_UPDATES = 30,
490 
491       /// \brief Record code for the table of offsets to CXXBaseSpecifier
492       /// sets.
493       CXX_BASE_SPECIFIER_OFFSETS = 31,
494 
495       /// \brief Record code for \#pragma diagnostic mappings.
496       DIAG_PRAGMA_MAPPINGS = 32,
497 
498       /// \brief Record code for special CUDA declarations.
499       CUDA_SPECIAL_DECL_REFS = 33,
500 
501       /// \brief Record code for header search information.
502       HEADER_SEARCH_TABLE = 34,
503 
504       /// \brief Record code for floating point \#pragma options.
505       FP_PRAGMA_OPTIONS = 35,
506 
507       /// \brief Record code for enabled OpenCL extensions.
508       OPENCL_EXTENSIONS = 36,
509 
510       /// \brief The list of delegating constructor declarations.
511       DELEGATING_CTORS = 37,
512 
513       /// \brief Record code for the set of known namespaces, which are used
514       /// for typo correction.
515       KNOWN_NAMESPACES = 38,
516 
517       /// \brief Record code for the remapping information used to relate
518       /// loaded modules to the various offsets and IDs(e.g., source location
519       /// offests, declaration and type IDs) that are used in that module to
520       /// refer to other modules.
521       MODULE_OFFSET_MAP = 39,
522 
523       /// \brief Record code for the source manager line table information,
524       /// which stores information about \#line directives.
525       SOURCE_MANAGER_LINE_TABLE = 40,
526 
527       /// \brief Record code for map of Objective-C class definition IDs to the
528       /// ObjC categories in a module that are attached to that class.
529       OBJC_CATEGORIES_MAP = 41,
530 
531       /// \brief Record code for a file sorted array of DeclIDs in a module.
532       FILE_SORTED_DECLS = 42,
533 
534       /// \brief Record code for an array of all of the (sub)modules that were
535       /// imported by the AST file.
536       IMPORTED_MODULES = 43,
537 
538       // ID 44 used to be a table of merged canonical declarations.
539       // ID 45 used to be a list of declaration IDs of local redeclarations.
540 
541       /// \brief Record code for the array of Objective-C categories (including
542       /// extensions).
543       ///
544       /// This array can only be interpreted properly using the Objective-C
545       /// categories map.
546       OBJC_CATEGORIES = 46,
547 
548       /// \brief Record code for the table of offsets of each macro ID.
549       ///
550       /// The offset table contains offsets into the blob stored in
551       /// the preprocessor block. Each offset points to the corresponding
552       /// macro definition.
553       MACRO_OFFSET = 47,
554 
555       /// \brief A list of "interesting" identifiers. Only used in C++ (where we
556       /// don't normally do lookups into the serialized identifier table). These
557       /// are eagerly deserialized.
558       INTERESTING_IDENTIFIERS = 48,
559 
560       /// \brief Record code for undefined but used functions and variables that
561       /// need a definition in this TU.
562       UNDEFINED_BUT_USED = 49,
563 
564       /// \brief Record code for late parsed template functions.
565       LATE_PARSED_TEMPLATE = 50,
566 
567       /// \brief Record code for \#pragma optimize options.
568       OPTIMIZE_PRAGMA_OPTIONS = 51,
569 
570       /// \brief Record code for potentially unused local typedef names.
571       UNUSED_LOCAL_TYPEDEF_NAME_CANDIDATES = 52,
572 
573       /// \brief Record code for the table of offsets to CXXCtorInitializers
574       /// lists.
575       CXX_CTOR_INITIALIZERS_OFFSETS = 53,
576 
577       /// \brief Delete expressions that will be analyzed later.
578       DELETE_EXPRS_TO_ANALYZE = 54
579     };
580 
581     /// \brief Record types used within a source manager block.
582     enum SourceManagerRecordTypes {
583       /// \brief Describes a source location entry (SLocEntry) for a
584       /// file.
585       SM_SLOC_FILE_ENTRY = 1,
586       /// \brief Describes a source location entry (SLocEntry) for a
587       /// buffer.
588       SM_SLOC_BUFFER_ENTRY = 2,
589       /// \brief Describes a blob that contains the data for a buffer
590       /// entry. This kind of record always directly follows a
591       /// SM_SLOC_BUFFER_ENTRY record or a SM_SLOC_FILE_ENTRY with an
592       /// overridden buffer.
593       SM_SLOC_BUFFER_BLOB = 3,
594       /// \brief Describes a source location entry (SLocEntry) for a
595       /// macro expansion.
596       SM_SLOC_EXPANSION_ENTRY = 4
597     };
598 
599     /// \brief Record types used within a preprocessor block.
600     enum PreprocessorRecordTypes {
601       // The macros in the PP section are a PP_MACRO_* instance followed by a
602       // list of PP_TOKEN instances for each token in the definition.
603 
604       /// \brief An object-like macro definition.
605       /// [PP_MACRO_OBJECT_LIKE, IdentInfoID, SLoc, IsUsed]
606       PP_MACRO_OBJECT_LIKE = 1,
607 
608       /// \brief A function-like macro definition.
609       /// [PP_MACRO_FUNCTION_LIKE, \<ObjectLikeStuff>, IsC99Varargs,
610       /// IsGNUVarars, NumArgs, ArgIdentInfoID* ]
611       PP_MACRO_FUNCTION_LIKE = 2,
612 
613       /// \brief Describes one token.
614       /// [PP_TOKEN, SLoc, Length, IdentInfoID, Kind, Flags]
615       PP_TOKEN = 3,
616 
617       /// \brief The macro directives history for a particular identifier.
618       PP_MACRO_DIRECTIVE_HISTORY = 4,
619 
620       /// \brief A macro directive exported by a module.
621       /// [PP_MODULE_MACRO, SubmoduleID, MacroID, (Overridden SubmoduleID)*]
622       PP_MODULE_MACRO = 5,
623     };
624 
625     /// \brief Record types used within a preprocessor detail block.
626     enum PreprocessorDetailRecordTypes {
627       /// \brief Describes a macro expansion within the preprocessing record.
628       PPD_MACRO_EXPANSION = 0,
629 
630       /// \brief Describes a macro definition within the preprocessing record.
631       PPD_MACRO_DEFINITION = 1,
632 
633       /// \brief Describes an inclusion directive within the preprocessing
634       /// record.
635       PPD_INCLUSION_DIRECTIVE = 2
636     };
637 
638     /// \brief Record types used within a submodule description block.
639     enum SubmoduleRecordTypes {
640       /// \brief Metadata for submodules as a whole.
641       SUBMODULE_METADATA = 0,
642       /// \brief Defines the major attributes of a submodule, including its
643       /// name and parent.
644       SUBMODULE_DEFINITION = 1,
645       /// \brief Specifies the umbrella header used to create this module,
646       /// if any.
647       SUBMODULE_UMBRELLA_HEADER = 2,
648       /// \brief Specifies a header that falls into this (sub)module.
649       SUBMODULE_HEADER = 3,
650       /// \brief Specifies a top-level header that falls into this (sub)module.
651       SUBMODULE_TOPHEADER = 4,
652       /// \brief Specifies an umbrella directory.
653       SUBMODULE_UMBRELLA_DIR = 5,
654       /// \brief Specifies the submodules that are imported by this
655       /// submodule.
656       SUBMODULE_IMPORTS = 6,
657       /// \brief Specifies the submodules that are re-exported from this
658       /// submodule.
659       SUBMODULE_EXPORTS = 7,
660       /// \brief Specifies a required feature.
661       SUBMODULE_REQUIRES = 8,
662       /// \brief Specifies a header that has been explicitly excluded
663       /// from this submodule.
664       SUBMODULE_EXCLUDED_HEADER = 9,
665       /// \brief Specifies a library or framework to link against.
666       SUBMODULE_LINK_LIBRARY = 10,
667       /// \brief Specifies a configuration macro for this module.
668       SUBMODULE_CONFIG_MACRO = 11,
669       /// \brief Specifies a conflict with another module.
670       SUBMODULE_CONFLICT = 12,
671       /// \brief Specifies a header that is private to this submodule.
672       SUBMODULE_PRIVATE_HEADER = 13,
673       /// \brief Specifies a header that is part of the module but must be
674       /// textually included.
675       SUBMODULE_TEXTUAL_HEADER = 14,
676       /// \brief Specifies a header that is private to this submodule but
677       /// must be textually included.
678       SUBMODULE_PRIVATE_TEXTUAL_HEADER = 15,
679     };
680 
681     /// \brief Record types used within a comments block.
682     enum CommentRecordTypes {
683       COMMENTS_RAW_COMMENT = 0
684     };
685 
686     /// \defgroup ASTAST AST file AST constants
687     ///
688     /// The constants in this group describe various components of the
689     /// abstract syntax tree within an AST file.
690     ///
691     /// @{
692 
693     /// \brief Predefined type IDs.
694     ///
695     /// These type IDs correspond to predefined types in the AST
696     /// context, such as built-in types (int) and special place-holder
697     /// types (the \<overload> and \<dependent> type markers). Such
698     /// types are never actually serialized, since they will be built
699     /// by the AST context when it is created.
700     enum PredefinedTypeIDs {
701       /// \brief The NULL type.
702       PREDEF_TYPE_NULL_ID       = 0,
703       /// \brief The void type.
704       PREDEF_TYPE_VOID_ID       = 1,
705       /// \brief The 'bool' or '_Bool' type.
706       PREDEF_TYPE_BOOL_ID       = 2,
707       /// \brief The 'char' type, when it is unsigned.
708       PREDEF_TYPE_CHAR_U_ID     = 3,
709       /// \brief The 'unsigned char' type.
710       PREDEF_TYPE_UCHAR_ID      = 4,
711       /// \brief The 'unsigned short' type.
712       PREDEF_TYPE_USHORT_ID     = 5,
713       /// \brief The 'unsigned int' type.
714       PREDEF_TYPE_UINT_ID       = 6,
715       /// \brief The 'unsigned long' type.
716       PREDEF_TYPE_ULONG_ID      = 7,
717       /// \brief The 'unsigned long long' type.
718       PREDEF_TYPE_ULONGLONG_ID  = 8,
719       /// \brief The 'char' type, when it is signed.
720       PREDEF_TYPE_CHAR_S_ID     = 9,
721       /// \brief The 'signed char' type.
722       PREDEF_TYPE_SCHAR_ID      = 10,
723       /// \brief The C++ 'wchar_t' type.
724       PREDEF_TYPE_WCHAR_ID      = 11,
725       /// \brief The (signed) 'short' type.
726       PREDEF_TYPE_SHORT_ID      = 12,
727       /// \brief The (signed) 'int' type.
728       PREDEF_TYPE_INT_ID        = 13,
729       /// \brief The (signed) 'long' type.
730       PREDEF_TYPE_LONG_ID       = 14,
731       /// \brief The (signed) 'long long' type.
732       PREDEF_TYPE_LONGLONG_ID   = 15,
733       /// \brief The 'float' type.
734       PREDEF_TYPE_FLOAT_ID      = 16,
735       /// \brief The 'double' type.
736       PREDEF_TYPE_DOUBLE_ID     = 17,
737       /// \brief The 'long double' type.
738       PREDEF_TYPE_LONGDOUBLE_ID = 18,
739       /// \brief The placeholder type for overloaded function sets.
740       PREDEF_TYPE_OVERLOAD_ID   = 19,
741       /// \brief The placeholder type for dependent types.
742       PREDEF_TYPE_DEPENDENT_ID  = 20,
743       /// \brief The '__uint128_t' type.
744       PREDEF_TYPE_UINT128_ID    = 21,
745       /// \brief The '__int128_t' type.
746       PREDEF_TYPE_INT128_ID     = 22,
747       /// \brief The type of 'nullptr'.
748       PREDEF_TYPE_NULLPTR_ID    = 23,
749       /// \brief The C++ 'char16_t' type.
750       PREDEF_TYPE_CHAR16_ID     = 24,
751       /// \brief The C++ 'char32_t' type.
752       PREDEF_TYPE_CHAR32_ID     = 25,
753       /// \brief The ObjC 'id' type.
754       PREDEF_TYPE_OBJC_ID       = 26,
755       /// \brief The ObjC 'Class' type.
756       PREDEF_TYPE_OBJC_CLASS    = 27,
757       /// \brief The ObjC 'SEL' type.
758       PREDEF_TYPE_OBJC_SEL      = 28,
759       /// \brief The 'unknown any' placeholder type.
760       PREDEF_TYPE_UNKNOWN_ANY   = 29,
761       /// \brief The placeholder type for bound member functions.
762       PREDEF_TYPE_BOUND_MEMBER  = 30,
763       /// \brief The "auto" deduction type.
764       PREDEF_TYPE_AUTO_DEDUCT   = 31,
765       /// \brief The "auto &&" deduction type.
766       PREDEF_TYPE_AUTO_RREF_DEDUCT = 32,
767       /// \brief The OpenCL 'half' / ARM NEON __fp16 type.
768       PREDEF_TYPE_HALF_ID       = 33,
769       /// \brief ARC's unbridged-cast placeholder type.
770       PREDEF_TYPE_ARC_UNBRIDGED_CAST = 34,
771       /// \brief The pseudo-object placeholder type.
772       PREDEF_TYPE_PSEUDO_OBJECT = 35,
773       /// \brief The placeholder type for builtin functions.
774       PREDEF_TYPE_BUILTIN_FN = 36,
775       /// \brief OpenCL 1d image type.
776       PREDEF_TYPE_IMAGE1D_ID    = 37,
777       /// \brief OpenCL 1d image array type.
778       PREDEF_TYPE_IMAGE1D_ARR_ID = 38,
779       /// \brief OpenCL 1d image buffer type.
780       PREDEF_TYPE_IMAGE1D_BUFF_ID = 39,
781       /// \brief OpenCL 2d image type.
782       PREDEF_TYPE_IMAGE2D_ID    = 40,
783       /// \brief OpenCL 2d image array type.
784       PREDEF_TYPE_IMAGE2D_ARR_ID = 41,
785       /// \brief OpenCL 2d image depth type.
786       PREDEF_TYPE_IMAGE2D_DEP_ID = 42,
787       /// \brief OpenCL 2d image array depth type.
788       PREDEF_TYPE_IMAGE2D_ARR_DEP_ID = 43,
789       /// \brief OpenCL 2d image MSAA type.
790       PREDEF_TYPE_IMAGE2D_MSAA_ID = 44,
791       /// \brief OpenCL 2d image array MSAA type.
792       PREDEF_TYPE_IMAGE2D_ARR_MSAA_ID = 45,
793       /// \brief OpenCL 2d image MSAA depth type.
794       PREDEF_TYPE_IMAGE2D_MSAA_DEP_ID = 46,
795       /// \brief OpenCL 2d image array MSAA depth type.
796       PREDEF_TYPE_IMAGE2D_ARR_MSAA_DEPTH_ID = 47,
797       /// \brief OpenCL 3d image type.
798       PREDEF_TYPE_IMAGE3D_ID    = 48,
799       /// \brief OpenCL event type.
800       PREDEF_TYPE_EVENT_ID      = 49,
801       /// \brief OpenCL clk event type.
802       PREDEF_TYPE_CLK_EVENT_ID  = 50,
803       /// \brief OpenCL sampler type.
804       PREDEF_TYPE_SAMPLER_ID    = 51,
805       /// \brief OpenCL queue type.
806       PREDEF_TYPE_QUEUE_ID      = 52,
807       /// \brief OpenCL ndrange type.
808       PREDEF_TYPE_NDRANGE_ID    = 53,
809       /// \brief OpenCL reserve_id type.
810       PREDEF_TYPE_RESERVE_ID_ID = 54,
811       /// \brief The placeholder type for OpenMP array section.
812       PREDEF_TYPE_OMP_ARRAY_SECTION = 55
813     };
814 
815     /// \brief The number of predefined type IDs that are reserved for
816     /// the PREDEF_TYPE_* constants.
817     ///
818     /// Type IDs for non-predefined types will start at
819     /// NUM_PREDEF_TYPE_IDs.
820     const unsigned NUM_PREDEF_TYPE_IDS = 100;
821 
822     /// \brief Record codes for each kind of type.
823     ///
824     /// These constants describe the type records that can occur within a
825     /// block identified by DECLTYPES_BLOCK_ID in the AST file. Each
826     /// constant describes a record for a specific type class in the
827     /// AST.
828     enum TypeCode {
829       /// \brief An ExtQualType record.
830       TYPE_EXT_QUAL                 = 1,
831       /// \brief A ComplexType record.
832       TYPE_COMPLEX                  = 3,
833       /// \brief A PointerType record.
834       TYPE_POINTER                  = 4,
835       /// \brief A BlockPointerType record.
836       TYPE_BLOCK_POINTER            = 5,
837       /// \brief An LValueReferenceType record.
838       TYPE_LVALUE_REFERENCE         = 6,
839       /// \brief An RValueReferenceType record.
840       TYPE_RVALUE_REFERENCE         = 7,
841       /// \brief A MemberPointerType record.
842       TYPE_MEMBER_POINTER           = 8,
843       /// \brief A ConstantArrayType record.
844       TYPE_CONSTANT_ARRAY           = 9,
845       /// \brief An IncompleteArrayType record.
846       TYPE_INCOMPLETE_ARRAY         = 10,
847       /// \brief A VariableArrayType record.
848       TYPE_VARIABLE_ARRAY           = 11,
849       /// \brief A VectorType record.
850       TYPE_VECTOR                   = 12,
851       /// \brief An ExtVectorType record.
852       TYPE_EXT_VECTOR               = 13,
853       /// \brief A FunctionNoProtoType record.
854       TYPE_FUNCTION_NO_PROTO        = 14,
855       /// \brief A FunctionProtoType record.
856       TYPE_FUNCTION_PROTO           = 15,
857       /// \brief A TypedefType record.
858       TYPE_TYPEDEF                  = 16,
859       /// \brief A TypeOfExprType record.
860       TYPE_TYPEOF_EXPR              = 17,
861       /// \brief A TypeOfType record.
862       TYPE_TYPEOF                   = 18,
863       /// \brief A RecordType record.
864       TYPE_RECORD                   = 19,
865       /// \brief An EnumType record.
866       TYPE_ENUM                     = 20,
867       /// \brief An ObjCInterfaceType record.
868       TYPE_OBJC_INTERFACE           = 21,
869       /// \brief An ObjCObjectPointerType record.
870       TYPE_OBJC_OBJECT_POINTER      = 22,
871       /// \brief a DecltypeType record.
872       TYPE_DECLTYPE                 = 23,
873       /// \brief An ElaboratedType record.
874       TYPE_ELABORATED               = 24,
875       /// \brief A SubstTemplateTypeParmType record.
876       TYPE_SUBST_TEMPLATE_TYPE_PARM = 25,
877       /// \brief An UnresolvedUsingType record.
878       TYPE_UNRESOLVED_USING         = 26,
879       /// \brief An InjectedClassNameType record.
880       TYPE_INJECTED_CLASS_NAME      = 27,
881       /// \brief An ObjCObjectType record.
882       TYPE_OBJC_OBJECT              = 28,
883       /// \brief An TemplateTypeParmType record.
884       TYPE_TEMPLATE_TYPE_PARM       = 29,
885       /// \brief An TemplateSpecializationType record.
886       TYPE_TEMPLATE_SPECIALIZATION  = 30,
887       /// \brief A DependentNameType record.
888       TYPE_DEPENDENT_NAME           = 31,
889       /// \brief A DependentTemplateSpecializationType record.
890       TYPE_DEPENDENT_TEMPLATE_SPECIALIZATION = 32,
891       /// \brief A DependentSizedArrayType record.
892       TYPE_DEPENDENT_SIZED_ARRAY    = 33,
893       /// \brief A ParenType record.
894       TYPE_PAREN                    = 34,
895       /// \brief A PackExpansionType record.
896       TYPE_PACK_EXPANSION           = 35,
897       /// \brief An AttributedType record.
898       TYPE_ATTRIBUTED               = 36,
899       /// \brief A SubstTemplateTypeParmPackType record.
900       TYPE_SUBST_TEMPLATE_TYPE_PARM_PACK = 37,
901       /// \brief A AutoType record.
902       TYPE_AUTO                  = 38,
903       /// \brief A UnaryTransformType record.
904       TYPE_UNARY_TRANSFORM       = 39,
905       /// \brief An AtomicType record.
906       TYPE_ATOMIC                = 40,
907       /// \brief A DecayedType record.
908       TYPE_DECAYED               = 41,
909       /// \brief An AdjustedType record.
910       TYPE_ADJUSTED              = 42
911     };
912 
913     /// \brief The type IDs for special types constructed by semantic
914     /// analysis.
915     ///
916     /// The constants in this enumeration are indices into the
917     /// SPECIAL_TYPES record.
918     enum SpecialTypeIDs {
919       /// \brief CFConstantString type
920       SPECIAL_TYPE_CF_CONSTANT_STRING          = 0,
921       /// \brief C FILE typedef type
922       SPECIAL_TYPE_FILE                        = 1,
923       /// \brief C jmp_buf typedef type
924       SPECIAL_TYPE_JMP_BUF                     = 2,
925       /// \brief C sigjmp_buf typedef type
926       SPECIAL_TYPE_SIGJMP_BUF                  = 3,
927       /// \brief Objective-C "id" redefinition type
928       SPECIAL_TYPE_OBJC_ID_REDEFINITION        = 4,
929       /// \brief Objective-C "Class" redefinition type
930       SPECIAL_TYPE_OBJC_CLASS_REDEFINITION     = 5,
931       /// \brief Objective-C "SEL" redefinition type
932       SPECIAL_TYPE_OBJC_SEL_REDEFINITION       = 6,
933       /// \brief C ucontext_t typedef type
934       SPECIAL_TYPE_UCONTEXT_T                  = 7
935     };
936 
937     /// \brief The number of special type IDs.
938     const unsigned NumSpecialTypeIDs = 8;
939 
940     /// \brief Predefined declaration IDs.
941     ///
942     /// These declaration IDs correspond to predefined declarations in the AST
943     /// context, such as the NULL declaration ID. Such declarations are never
944     /// actually serialized, since they will be built by the AST context when
945     /// it is created.
946     enum PredefinedDeclIDs {
947       /// \brief The NULL declaration.
948       PREDEF_DECL_NULL_ID = 0,
949 
950       /// \brief The translation unit.
951       PREDEF_DECL_TRANSLATION_UNIT_ID = 1,
952 
953       /// \brief The Objective-C 'id' type.
954       PREDEF_DECL_OBJC_ID_ID = 2,
955 
956       /// \brief The Objective-C 'SEL' type.
957       PREDEF_DECL_OBJC_SEL_ID = 3,
958 
959       /// \brief The Objective-C 'Class' type.
960       PREDEF_DECL_OBJC_CLASS_ID = 4,
961 
962       /// \brief The Objective-C 'Protocol' type.
963       PREDEF_DECL_OBJC_PROTOCOL_ID = 5,
964 
965       /// \brief The signed 128-bit integer type.
966       PREDEF_DECL_INT_128_ID = 6,
967 
968       /// \brief The unsigned 128-bit integer type.
969       PREDEF_DECL_UNSIGNED_INT_128_ID = 7,
970 
971       /// \brief The internal 'instancetype' typedef.
972       PREDEF_DECL_OBJC_INSTANCETYPE_ID = 8,
973 
974       /// \brief The internal '__builtin_va_list' typedef.
975       PREDEF_DECL_BUILTIN_VA_LIST_ID = 9,
976 
977       /// \brief The internal '__va_list_tag' struct, if any.
978       PREDEF_DECL_VA_LIST_TAG = 10,
979 
980       /// \brief The internal '__builtin_ms_va_list' typedef.
981       PREDEF_DECL_BUILTIN_MS_VA_LIST_ID = 11,
982 
983       /// \brief The extern "C" context.
984       PREDEF_DECL_EXTERN_C_CONTEXT_ID = 12,
985 
986       /// \brief The internal '__make_integer_seq' template.
987       PREDEF_DECL_MAKE_INTEGER_SEQ_ID = 13,
988     };
989 
990     /// \brief The number of declaration IDs that are predefined.
991     ///
992     /// For more information about predefined declarations, see the
993     /// \c PredefinedDeclIDs type and the PREDEF_DECL_*_ID constants.
994     const unsigned int NUM_PREDEF_DECL_IDS = 14;
995 
996     /// \brief Record code for a list of local redeclarations of a declaration.
997     const unsigned int LOCAL_REDECLARATIONS = 50;
998 
999     /// \brief Record codes for each kind of declaration.
1000     ///
1001     /// These constants describe the declaration records that can occur within
1002     /// a declarations block (identified by DECLS_BLOCK_ID). Each
1003     /// constant describes a record for a specific declaration class
1004     /// in the AST.
1005     enum DeclCode {
1006       /// \brief A TypedefDecl record.
1007       DECL_TYPEDEF = 51,
1008       /// \brief A TypeAliasDecl record.
1009       DECL_TYPEALIAS,
1010       /// \brief An EnumDecl record.
1011       DECL_ENUM,
1012       /// \brief A RecordDecl record.
1013       DECL_RECORD,
1014       /// \brief An EnumConstantDecl record.
1015       DECL_ENUM_CONSTANT,
1016       /// \brief A FunctionDecl record.
1017       DECL_FUNCTION,
1018       /// \brief A ObjCMethodDecl record.
1019       DECL_OBJC_METHOD,
1020       /// \brief A ObjCInterfaceDecl record.
1021       DECL_OBJC_INTERFACE,
1022       /// \brief A ObjCProtocolDecl record.
1023       DECL_OBJC_PROTOCOL,
1024       /// \brief A ObjCIvarDecl record.
1025       DECL_OBJC_IVAR,
1026       /// \brief A ObjCAtDefsFieldDecl record.
1027       DECL_OBJC_AT_DEFS_FIELD,
1028       /// \brief A ObjCCategoryDecl record.
1029       DECL_OBJC_CATEGORY,
1030       /// \brief A ObjCCategoryImplDecl record.
1031       DECL_OBJC_CATEGORY_IMPL,
1032       /// \brief A ObjCImplementationDecl record.
1033       DECL_OBJC_IMPLEMENTATION,
1034       /// \brief A ObjCCompatibleAliasDecl record.
1035       DECL_OBJC_COMPATIBLE_ALIAS,
1036       /// \brief A ObjCPropertyDecl record.
1037       DECL_OBJC_PROPERTY,
1038       /// \brief A ObjCPropertyImplDecl record.
1039       DECL_OBJC_PROPERTY_IMPL,
1040       /// \brief A FieldDecl record.
1041       DECL_FIELD,
1042       /// \brief A MSPropertyDecl record.
1043       DECL_MS_PROPERTY,
1044       /// \brief A VarDecl record.
1045       DECL_VAR,
1046       /// \brief An ImplicitParamDecl record.
1047       DECL_IMPLICIT_PARAM,
1048       /// \brief A ParmVarDecl record.
1049       DECL_PARM_VAR,
1050       /// \brief A FileScopeAsmDecl record.
1051       DECL_FILE_SCOPE_ASM,
1052       /// \brief A BlockDecl record.
1053       DECL_BLOCK,
1054       /// \brief A CapturedDecl record.
1055       DECL_CAPTURED,
1056       /// \brief A record that stores the set of declarations that are
1057       /// lexically stored within a given DeclContext.
1058       ///
1059       /// The record itself is a blob that is an array of declaration IDs,
1060       /// in the order in which those declarations were added to the
1061       /// declaration context. This data is used when iterating over
1062       /// the contents of a DeclContext, e.g., via
1063       /// DeclContext::decls_begin() and DeclContext::decls_end().
1064       DECL_CONTEXT_LEXICAL,
1065       /// \brief A record that stores the set of declarations that are
1066       /// visible from a given DeclContext.
1067       ///
1068       /// The record itself stores a set of mappings, each of which
1069       /// associates a declaration name with one or more declaration
1070       /// IDs. This data is used when performing qualified name lookup
1071       /// into a DeclContext via DeclContext::lookup.
1072       DECL_CONTEXT_VISIBLE,
1073       /// \brief A LabelDecl record.
1074       DECL_LABEL,
1075       /// \brief A NamespaceDecl record.
1076       DECL_NAMESPACE,
1077       /// \brief A NamespaceAliasDecl record.
1078       DECL_NAMESPACE_ALIAS,
1079       /// \brief A UsingDecl record.
1080       DECL_USING,
1081       /// \brief A UsingShadowDecl record.
1082       DECL_USING_SHADOW,
1083       /// \brief A UsingDirecitveDecl record.
1084       DECL_USING_DIRECTIVE,
1085       /// \brief An UnresolvedUsingValueDecl record.
1086       DECL_UNRESOLVED_USING_VALUE,
1087       /// \brief An UnresolvedUsingTypenameDecl record.
1088       DECL_UNRESOLVED_USING_TYPENAME,
1089       /// \brief A LinkageSpecDecl record.
1090       DECL_LINKAGE_SPEC,
1091       /// \brief A CXXRecordDecl record.
1092       DECL_CXX_RECORD,
1093       /// \brief A CXXMethodDecl record.
1094       DECL_CXX_METHOD,
1095       /// \brief A CXXConstructorDecl record.
1096       DECL_CXX_CONSTRUCTOR,
1097       /// \brief A CXXDestructorDecl record.
1098       DECL_CXX_DESTRUCTOR,
1099       /// \brief A CXXConversionDecl record.
1100       DECL_CXX_CONVERSION,
1101       /// \brief An AccessSpecDecl record.
1102       DECL_ACCESS_SPEC,
1103 
1104       /// \brief A FriendDecl record.
1105       DECL_FRIEND,
1106       /// \brief A FriendTemplateDecl record.
1107       DECL_FRIEND_TEMPLATE,
1108       /// \brief A ClassTemplateDecl record.
1109       DECL_CLASS_TEMPLATE,
1110       /// \brief A ClassTemplateSpecializationDecl record.
1111       DECL_CLASS_TEMPLATE_SPECIALIZATION,
1112       /// \brief A ClassTemplatePartialSpecializationDecl record.
1113       DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION,
1114       /// \brief A VarTemplateDecl record.
1115       DECL_VAR_TEMPLATE,
1116       /// \brief A VarTemplateSpecializationDecl record.
1117       DECL_VAR_TEMPLATE_SPECIALIZATION,
1118       /// \brief A VarTemplatePartialSpecializationDecl record.
1119       DECL_VAR_TEMPLATE_PARTIAL_SPECIALIZATION,
1120       /// \brief A FunctionTemplateDecl record.
1121       DECL_FUNCTION_TEMPLATE,
1122       /// \brief A TemplateTypeParmDecl record.
1123       DECL_TEMPLATE_TYPE_PARM,
1124       /// \brief A NonTypeTemplateParmDecl record.
1125       DECL_NON_TYPE_TEMPLATE_PARM,
1126       /// \brief A TemplateTemplateParmDecl record.
1127       DECL_TEMPLATE_TEMPLATE_PARM,
1128       /// \brief A TypeAliasTemplateDecl record.
1129       DECL_TYPE_ALIAS_TEMPLATE,
1130       /// \brief A StaticAssertDecl record.
1131       DECL_STATIC_ASSERT,
1132       /// \brief A record containing CXXBaseSpecifiers.
1133       DECL_CXX_BASE_SPECIFIERS,
1134       /// \brief A record containing CXXCtorInitializers.
1135       DECL_CXX_CTOR_INITIALIZERS,
1136       /// \brief A IndirectFieldDecl record.
1137       DECL_INDIRECTFIELD,
1138       /// \brief A NonTypeTemplateParmDecl record that stores an expanded
1139       /// non-type template parameter pack.
1140       DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK,
1141       /// \brief A TemplateTemplateParmDecl record that stores an expanded
1142       /// template template parameter pack.
1143       DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK,
1144       /// \brief A ClassScopeFunctionSpecializationDecl record a class scope
1145       /// function specialization. (Microsoft extension).
1146       DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION,
1147       /// \brief An ImportDecl recording a module import.
1148       DECL_IMPORT,
1149       /// \brief An OMPThreadPrivateDecl record.
1150       DECL_OMP_THREADPRIVATE,
1151       /// \brief An EmptyDecl record.
1152       DECL_EMPTY,
1153       /// \brief An ObjCTypeParamDecl record.
1154       DECL_OBJC_TYPE_PARAM,
1155     };
1156 
1157     /// \brief Record codes for each kind of statement or expression.
1158     ///
1159     /// These constants describe the records that describe statements
1160     /// or expressions. These records  occur within type and declarations
1161     /// block, so they begin with record values of 128.  Each constant
1162     /// describes a record for a specific statement or expression class in the
1163     /// AST.
1164     enum StmtCode {
1165       /// \brief A marker record that indicates that we are at the end
1166       /// of an expression.
1167       STMT_STOP = 128,
1168       /// \brief A NULL expression.
1169       STMT_NULL_PTR,
1170       /// \brief A reference to a previously [de]serialized Stmt record.
1171       STMT_REF_PTR,
1172       /// \brief A NullStmt record.
1173       STMT_NULL,
1174       /// \brief A CompoundStmt record.
1175       STMT_COMPOUND,
1176       /// \brief A CaseStmt record.
1177       STMT_CASE,
1178       /// \brief A DefaultStmt record.
1179       STMT_DEFAULT,
1180       /// \brief A LabelStmt record.
1181       STMT_LABEL,
1182       /// \brief An AttributedStmt record.
1183       STMT_ATTRIBUTED,
1184       /// \brief An IfStmt record.
1185       STMT_IF,
1186       /// \brief A SwitchStmt record.
1187       STMT_SWITCH,
1188       /// \brief A WhileStmt record.
1189       STMT_WHILE,
1190       /// \brief A DoStmt record.
1191       STMT_DO,
1192       /// \brief A ForStmt record.
1193       STMT_FOR,
1194       /// \brief A GotoStmt record.
1195       STMT_GOTO,
1196       /// \brief An IndirectGotoStmt record.
1197       STMT_INDIRECT_GOTO,
1198       /// \brief A ContinueStmt record.
1199       STMT_CONTINUE,
1200       /// \brief A BreakStmt record.
1201       STMT_BREAK,
1202       /// \brief A ReturnStmt record.
1203       STMT_RETURN,
1204       /// \brief A DeclStmt record.
1205       STMT_DECL,
1206       /// \brief A CapturedStmt record.
1207       STMT_CAPTURED,
1208       /// \brief A GCC-style AsmStmt record.
1209       STMT_GCCASM,
1210       /// \brief A MS-style AsmStmt record.
1211       STMT_MSASM,
1212       /// \brief A PredefinedExpr record.
1213       EXPR_PREDEFINED,
1214       /// \brief A DeclRefExpr record.
1215       EXPR_DECL_REF,
1216       /// \brief An IntegerLiteral record.
1217       EXPR_INTEGER_LITERAL,
1218       /// \brief A FloatingLiteral record.
1219       EXPR_FLOATING_LITERAL,
1220       /// \brief An ImaginaryLiteral record.
1221       EXPR_IMAGINARY_LITERAL,
1222       /// \brief A StringLiteral record.
1223       EXPR_STRING_LITERAL,
1224       /// \brief A CharacterLiteral record.
1225       EXPR_CHARACTER_LITERAL,
1226       /// \brief A ParenExpr record.
1227       EXPR_PAREN,
1228       /// \brief A ParenListExpr record.
1229       EXPR_PAREN_LIST,
1230       /// \brief A UnaryOperator record.
1231       EXPR_UNARY_OPERATOR,
1232       /// \brief An OffsetOfExpr record.
1233       EXPR_OFFSETOF,
1234       /// \brief A SizefAlignOfExpr record.
1235       EXPR_SIZEOF_ALIGN_OF,
1236       /// \brief An ArraySubscriptExpr record.
1237       EXPR_ARRAY_SUBSCRIPT,
1238       /// \brief A CallExpr record.
1239       EXPR_CALL,
1240       /// \brief A MemberExpr record.
1241       EXPR_MEMBER,
1242       /// \brief A BinaryOperator record.
1243       EXPR_BINARY_OPERATOR,
1244       /// \brief A CompoundAssignOperator record.
1245       EXPR_COMPOUND_ASSIGN_OPERATOR,
1246       /// \brief A ConditionOperator record.
1247       EXPR_CONDITIONAL_OPERATOR,
1248       /// \brief An ImplicitCastExpr record.
1249       EXPR_IMPLICIT_CAST,
1250       /// \brief A CStyleCastExpr record.
1251       EXPR_CSTYLE_CAST,
1252       /// \brief A CompoundLiteralExpr record.
1253       EXPR_COMPOUND_LITERAL,
1254       /// \brief An ExtVectorElementExpr record.
1255       EXPR_EXT_VECTOR_ELEMENT,
1256       /// \brief An InitListExpr record.
1257       EXPR_INIT_LIST,
1258       /// \brief A DesignatedInitExpr record.
1259       EXPR_DESIGNATED_INIT,
1260       /// \brief A DesignatedInitUpdateExpr record.
1261       EXPR_DESIGNATED_INIT_UPDATE,
1262       /// \brief An ImplicitValueInitExpr record.
1263       EXPR_IMPLICIT_VALUE_INIT,
1264       /// \brief An NoInitExpr record.
1265       EXPR_NO_INIT,
1266       /// \brief A VAArgExpr record.
1267       EXPR_VA_ARG,
1268       /// \brief An AddrLabelExpr record.
1269       EXPR_ADDR_LABEL,
1270       /// \brief A StmtExpr record.
1271       EXPR_STMT,
1272       /// \brief A ChooseExpr record.
1273       EXPR_CHOOSE,
1274       /// \brief A GNUNullExpr record.
1275       EXPR_GNU_NULL,
1276       /// \brief A ShuffleVectorExpr record.
1277       EXPR_SHUFFLE_VECTOR,
1278       /// \brief A ConvertVectorExpr record.
1279       EXPR_CONVERT_VECTOR,
1280       /// \brief BlockExpr
1281       EXPR_BLOCK,
1282       /// \brief A GenericSelectionExpr record.
1283       EXPR_GENERIC_SELECTION,
1284       /// \brief A PseudoObjectExpr record.
1285       EXPR_PSEUDO_OBJECT,
1286       /// \brief An AtomicExpr record.
1287       EXPR_ATOMIC,
1288 
1289       // Objective-C
1290 
1291       /// \brief An ObjCStringLiteral record.
1292       EXPR_OBJC_STRING_LITERAL,
1293 
1294       EXPR_OBJC_BOXED_EXPRESSION,
1295       EXPR_OBJC_ARRAY_LITERAL,
1296       EXPR_OBJC_DICTIONARY_LITERAL,
1297 
1298 
1299       /// \brief An ObjCEncodeExpr record.
1300       EXPR_OBJC_ENCODE,
1301       /// \brief An ObjCSelectorExpr record.
1302       EXPR_OBJC_SELECTOR_EXPR,
1303       /// \brief An ObjCProtocolExpr record.
1304       EXPR_OBJC_PROTOCOL_EXPR,
1305       /// \brief An ObjCIvarRefExpr record.
1306       EXPR_OBJC_IVAR_REF_EXPR,
1307       /// \brief An ObjCPropertyRefExpr record.
1308       EXPR_OBJC_PROPERTY_REF_EXPR,
1309       /// \brief An ObjCSubscriptRefExpr record.
1310       EXPR_OBJC_SUBSCRIPT_REF_EXPR,
1311       /// \brief UNUSED
1312       EXPR_OBJC_KVC_REF_EXPR,
1313       /// \brief An ObjCMessageExpr record.
1314       EXPR_OBJC_MESSAGE_EXPR,
1315       /// \brief An ObjCIsa Expr record.
1316       EXPR_OBJC_ISA,
1317       /// \brief An ObjCIndirectCopyRestoreExpr record.
1318       EXPR_OBJC_INDIRECT_COPY_RESTORE,
1319 
1320       /// \brief An ObjCForCollectionStmt record.
1321       STMT_OBJC_FOR_COLLECTION,
1322       /// \brief An ObjCAtCatchStmt record.
1323       STMT_OBJC_CATCH,
1324       /// \brief An ObjCAtFinallyStmt record.
1325       STMT_OBJC_FINALLY,
1326       /// \brief An ObjCAtTryStmt record.
1327       STMT_OBJC_AT_TRY,
1328       /// \brief An ObjCAtSynchronizedStmt record.
1329       STMT_OBJC_AT_SYNCHRONIZED,
1330       /// \brief An ObjCAtThrowStmt record.
1331       STMT_OBJC_AT_THROW,
1332       /// \brief An ObjCAutoreleasePoolStmt record.
1333       STMT_OBJC_AUTORELEASE_POOL,
1334       /// \brief A ObjCBoolLiteralExpr record.
1335       EXPR_OBJC_BOOL_LITERAL,
1336 
1337       // C++
1338 
1339       /// \brief A CXXCatchStmt record.
1340       STMT_CXX_CATCH,
1341       /// \brief A CXXTryStmt record.
1342       STMT_CXX_TRY,
1343       /// \brief A CXXForRangeStmt record.
1344       STMT_CXX_FOR_RANGE,
1345 
1346       /// \brief A CXXOperatorCallExpr record.
1347       EXPR_CXX_OPERATOR_CALL,
1348       /// \brief A CXXMemberCallExpr record.
1349       EXPR_CXX_MEMBER_CALL,
1350       /// \brief A CXXConstructExpr record.
1351       EXPR_CXX_CONSTRUCT,
1352       /// \brief A CXXTemporaryObjectExpr record.
1353       EXPR_CXX_TEMPORARY_OBJECT,
1354       /// \brief A CXXStaticCastExpr record.
1355       EXPR_CXX_STATIC_CAST,
1356       /// \brief A CXXDynamicCastExpr record.
1357       EXPR_CXX_DYNAMIC_CAST,
1358       /// \brief A CXXReinterpretCastExpr record.
1359       EXPR_CXX_REINTERPRET_CAST,
1360       /// \brief A CXXConstCastExpr record.
1361       EXPR_CXX_CONST_CAST,
1362       /// \brief A CXXFunctionalCastExpr record.
1363       EXPR_CXX_FUNCTIONAL_CAST,
1364       /// \brief A UserDefinedLiteral record.
1365       EXPR_USER_DEFINED_LITERAL,
1366       /// \brief A CXXStdInitializerListExpr record.
1367       EXPR_CXX_STD_INITIALIZER_LIST,
1368       /// \brief A CXXBoolLiteralExpr record.
1369       EXPR_CXX_BOOL_LITERAL,
1370       EXPR_CXX_NULL_PTR_LITERAL,  // CXXNullPtrLiteralExpr
1371       EXPR_CXX_TYPEID_EXPR,       // CXXTypeidExpr (of expr).
1372       EXPR_CXX_TYPEID_TYPE,       // CXXTypeidExpr (of type).
1373       EXPR_CXX_THIS,              // CXXThisExpr
1374       EXPR_CXX_THROW,             // CXXThrowExpr
1375       EXPR_CXX_DEFAULT_ARG,       // CXXDefaultArgExpr
1376       EXPR_CXX_DEFAULT_INIT,      // CXXDefaultInitExpr
1377       EXPR_CXX_BIND_TEMPORARY,    // CXXBindTemporaryExpr
1378 
1379       EXPR_CXX_SCALAR_VALUE_INIT, // CXXScalarValueInitExpr
1380       EXPR_CXX_NEW,               // CXXNewExpr
1381       EXPR_CXX_DELETE,            // CXXDeleteExpr
1382       EXPR_CXX_PSEUDO_DESTRUCTOR, // CXXPseudoDestructorExpr
1383 
1384       EXPR_EXPR_WITH_CLEANUPS,    // ExprWithCleanups
1385 
1386       EXPR_CXX_DEPENDENT_SCOPE_MEMBER,   // CXXDependentScopeMemberExpr
1387       EXPR_CXX_DEPENDENT_SCOPE_DECL_REF, // DependentScopeDeclRefExpr
1388       EXPR_CXX_UNRESOLVED_CONSTRUCT,     // CXXUnresolvedConstructExpr
1389       EXPR_CXX_UNRESOLVED_MEMBER,        // UnresolvedMemberExpr
1390       EXPR_CXX_UNRESOLVED_LOOKUP,        // UnresolvedLookupExpr
1391 
1392       EXPR_CXX_EXPRESSION_TRAIT,  // ExpressionTraitExpr
1393       EXPR_CXX_NOEXCEPT,          // CXXNoexceptExpr
1394 
1395       EXPR_OPAQUE_VALUE,          // OpaqueValueExpr
1396       EXPR_BINARY_CONDITIONAL_OPERATOR,  // BinaryConditionalOperator
1397       EXPR_TYPE_TRAIT,            // TypeTraitExpr
1398       EXPR_ARRAY_TYPE_TRAIT,      // ArrayTypeTraitIntExpr
1399 
1400       EXPR_PACK_EXPANSION,        // PackExpansionExpr
1401       EXPR_SIZEOF_PACK,           // SizeOfPackExpr
1402       EXPR_SUBST_NON_TYPE_TEMPLATE_PARM, // SubstNonTypeTemplateParmExpr
1403       EXPR_SUBST_NON_TYPE_TEMPLATE_PARM_PACK,// SubstNonTypeTemplateParmPackExpr
1404       EXPR_FUNCTION_PARM_PACK,    // FunctionParmPackExpr
1405       EXPR_MATERIALIZE_TEMPORARY, // MaterializeTemporaryExpr
1406       EXPR_CXX_FOLD,              // CXXFoldExpr
1407 
1408       // CUDA
1409       EXPR_CUDA_KERNEL_CALL,       // CUDAKernelCallExpr
1410 
1411       // OpenCL
1412       EXPR_ASTYPE,                 // AsTypeExpr
1413 
1414       // Microsoft
1415       EXPR_CXX_PROPERTY_REF_EXPR, // MSPropertyRefExpr
1416       EXPR_CXX_PROPERTY_SUBSCRIPT_EXPR, // MSPropertySubscriptExpr
1417       EXPR_CXX_UUIDOF_EXPR,       // CXXUuidofExpr (of expr).
1418       EXPR_CXX_UUIDOF_TYPE,       // CXXUuidofExpr (of type).
1419       STMT_SEH_LEAVE,             // SEHLeaveStmt
1420       STMT_SEH_EXCEPT,            // SEHExceptStmt
1421       STMT_SEH_FINALLY,           // SEHFinallyStmt
1422       STMT_SEH_TRY,               // SEHTryStmt
1423 
1424       // OpenMP directives
1425       STMT_OMP_PARALLEL_DIRECTIVE,
1426       STMT_OMP_SIMD_DIRECTIVE,
1427       STMT_OMP_FOR_DIRECTIVE,
1428       STMT_OMP_FOR_SIMD_DIRECTIVE,
1429       STMT_OMP_SECTIONS_DIRECTIVE,
1430       STMT_OMP_SECTION_DIRECTIVE,
1431       STMT_OMP_SINGLE_DIRECTIVE,
1432       STMT_OMP_MASTER_DIRECTIVE,
1433       STMT_OMP_CRITICAL_DIRECTIVE,
1434       STMT_OMP_PARALLEL_FOR_DIRECTIVE,
1435       STMT_OMP_PARALLEL_FOR_SIMD_DIRECTIVE,
1436       STMT_OMP_PARALLEL_SECTIONS_DIRECTIVE,
1437       STMT_OMP_TASK_DIRECTIVE,
1438       STMT_OMP_TASKYIELD_DIRECTIVE,
1439       STMT_OMP_BARRIER_DIRECTIVE,
1440       STMT_OMP_TASKWAIT_DIRECTIVE,
1441       STMT_OMP_FLUSH_DIRECTIVE,
1442       STMT_OMP_ORDERED_DIRECTIVE,
1443       STMT_OMP_ATOMIC_DIRECTIVE,
1444       STMT_OMP_TARGET_DIRECTIVE,
1445       STMT_OMP_TARGET_DATA_DIRECTIVE,
1446       STMT_OMP_TEAMS_DIRECTIVE,
1447       STMT_OMP_TASKGROUP_DIRECTIVE,
1448       STMT_OMP_CANCELLATION_POINT_DIRECTIVE,
1449       STMT_OMP_CANCEL_DIRECTIVE,
1450       STMT_OMP_TASKLOOP_DIRECTIVE,
1451       STMT_OMP_TASKLOOP_SIMD_DIRECTIVE,
1452       STMT_OMP_DISTRIBUTE_DIRECTIVE,
1453       EXPR_OMP_ARRAY_SECTION,
1454 
1455       // ARC
1456       EXPR_OBJC_BRIDGED_CAST,     // ObjCBridgedCastExpr
1457 
1458       STMT_MS_DEPENDENT_EXISTS,   // MSDependentExistsStmt
1459       EXPR_LAMBDA                 // LambdaExpr
1460     };
1461 
1462     /// \brief The kinds of designators that can occur in a
1463     /// DesignatedInitExpr.
1464     enum DesignatorTypes {
1465       /// \brief Field designator where only the field name is known.
1466       DESIG_FIELD_NAME  = 0,
1467       /// \brief Field designator where the field has been resolved to
1468       /// a declaration.
1469       DESIG_FIELD_DECL  = 1,
1470       /// \brief Array designator.
1471       DESIG_ARRAY       = 2,
1472       /// \brief GNU array range designator.
1473       DESIG_ARRAY_RANGE = 3
1474     };
1475 
1476     /// \brief The different kinds of data that can occur in a
1477     /// CtorInitializer.
1478     enum CtorInitializerType {
1479       CTOR_INITIALIZER_BASE,
1480       CTOR_INITIALIZER_DELEGATING,
1481       CTOR_INITIALIZER_MEMBER,
1482       CTOR_INITIALIZER_INDIRECT_MEMBER
1483     };
1484 
1485     /// \brief Describes the redeclarations of a declaration.
1486     struct LocalRedeclarationsInfo {
1487       DeclID FirstID;      // The ID of the first declaration
1488       unsigned Offset;     // Offset into the array of redeclaration chains.
1489 
1490       friend bool operator<(const LocalRedeclarationsInfo &X,
1491                             const LocalRedeclarationsInfo &Y) {
1492         return X.FirstID < Y.FirstID;
1493       }
1494 
1495       friend bool operator>(const LocalRedeclarationsInfo &X,
1496                             const LocalRedeclarationsInfo &Y) {
1497         return X.FirstID > Y.FirstID;
1498       }
1499 
1500       friend bool operator<=(const LocalRedeclarationsInfo &X,
1501                              const LocalRedeclarationsInfo &Y) {
1502         return X.FirstID <= Y.FirstID;
1503       }
1504 
1505       friend bool operator>=(const LocalRedeclarationsInfo &X,
1506                              const LocalRedeclarationsInfo &Y) {
1507         return X.FirstID >= Y.FirstID;
1508       }
1509     };
1510 
1511     /// \brief Describes the categories of an Objective-C class.
1512     struct ObjCCategoriesInfo {
1513       DeclID DefinitionID; // The ID of the definition
1514       unsigned Offset;     // Offset into the array of category lists.
1515 
1516       friend bool operator<(const ObjCCategoriesInfo &X,
1517                             const ObjCCategoriesInfo &Y) {
1518         return X.DefinitionID < Y.DefinitionID;
1519       }
1520 
1521       friend bool operator>(const ObjCCategoriesInfo &X,
1522                             const ObjCCategoriesInfo &Y) {
1523         return X.DefinitionID > Y.DefinitionID;
1524       }
1525 
1526       friend bool operator<=(const ObjCCategoriesInfo &X,
1527                              const ObjCCategoriesInfo &Y) {
1528         return X.DefinitionID <= Y.DefinitionID;
1529       }
1530 
1531       friend bool operator>=(const ObjCCategoriesInfo &X,
1532                              const ObjCCategoriesInfo &Y) {
1533         return X.DefinitionID >= Y.DefinitionID;
1534       }
1535     };
1536 
1537     /// \brief A key used when looking up entities by \ref DeclarationName.
1538     ///
1539     /// Different \ref DeclarationNames are mapped to different keys, but the
1540     /// same key can occasionally represent multiple names (for names that
1541     /// contain types, in particular).
1542     class DeclarationNameKey {
1543       typedef unsigned NameKind;
1544 
1545       NameKind Kind;
1546       uint64_t Data;
1547 
1548     public:
DeclarationNameKey()1549       DeclarationNameKey() : Kind(), Data() {}
1550       DeclarationNameKey(DeclarationName Name);
1551 
DeclarationNameKey(NameKind Kind,uint64_t Data)1552       DeclarationNameKey(NameKind Kind, uint64_t Data)
1553           : Kind(Kind), Data(Data) {}
1554 
getKind()1555       NameKind getKind() const { return Kind; }
1556 
getIdentifier()1557       IdentifierInfo *getIdentifier() const {
1558         assert(Kind == DeclarationName::Identifier ||
1559                Kind == DeclarationName::CXXLiteralOperatorName);
1560         return (IdentifierInfo *)Data;
1561       }
getSelector()1562       Selector getSelector() const {
1563         assert(Kind == DeclarationName::ObjCZeroArgSelector ||
1564                Kind == DeclarationName::ObjCOneArgSelector ||
1565                Kind == DeclarationName::ObjCMultiArgSelector);
1566         return Selector(Data);
1567       }
getOperatorKind()1568       OverloadedOperatorKind getOperatorKind() const {
1569         assert(Kind == DeclarationName::CXXOperatorName);
1570         return (OverloadedOperatorKind)Data;
1571       }
1572 
1573       /// Compute a fingerprint of this key for use in on-disk hash table.
1574       unsigned getHash() const;
1575 
1576       friend bool operator==(const DeclarationNameKey &A,
1577                              const DeclarationNameKey &B) {
1578         return A.Kind == B.Kind && A.Data == B.Data;
1579       }
1580     };
1581 
1582     /// @}
1583   }
1584 } // end namespace clang
1585 
1586 namespace llvm {
1587   template <> struct DenseMapInfo<clang::serialization::DeclarationNameKey> {
1588     static clang::serialization::DeclarationNameKey getEmptyKey() {
1589       return clang::serialization::DeclarationNameKey(-1, 1);
1590     }
1591     static clang::serialization::DeclarationNameKey getTombstoneKey() {
1592       return clang::serialization::DeclarationNameKey(-1, 2);
1593     }
1594     static unsigned
1595     getHashValue(const clang::serialization::DeclarationNameKey &Key) {
1596       return Key.getHash();
1597     }
1598     static bool isEqual(const clang::serialization::DeclarationNameKey &L,
1599                         const clang::serialization::DeclarationNameKey &R) {
1600       return L == R;
1601     }
1602   };
1603 }
1604 
1605 #endif
1606