1 //===--- Module.h - Module description --------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the Module class, which describes a module that has
11 // been loaded from an AST file.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_CLANG_SERIALIZATION_MODULE_H
16 #define LLVM_CLANG_SERIALIZATION_MODULE_H
18 #include "clang/Basic/FileManager.h"
19 #include "clang/Basic/SourceLocation.h"
20 #include "clang/Serialization/ASTBitCodes.h"
21 #include "clang/Serialization/ContinuousRangeMap.h"
22 #include "clang/Serialization/ModuleFileExtension.h"
23 #include "llvm/ADT/SetVector.h"
24 #include "llvm/Bitcode/BitstreamReader.h"
25 #include "llvm/Support/Endian.h"
30 template <typename Info> class OnDiskChainedHashTable;
31 template <typename Info> class OnDiskIterableChainedHashTable;
39 namespace serialization {
42 class ASTDeclContextNameLookupTrait;
45 /// \brief Specifies the kind of module that has been loaded.
47 MK_ImplicitModule, ///< File is an implicitly-loaded module.
48 MK_ExplicitModule, ///< File is an explicitly-loaded module.
49 MK_PCH, ///< File is a PCH file treated as such.
50 MK_Preamble, ///< File is a PCH file treated as the preamble.
51 MK_MainFile, ///< File is a PCH file treated as the actual main file.
52 MK_PrebuiltModule ///< File is from a prebuilt module path.
55 /// \brief The input file that has been loaded from this AST file, along with
56 /// bools indicating whether this was an overridden buffer or if it was
57 /// out-of-date or not-found.
64 llvm::PointerIntPair<const FileEntry *, 2, unsigned> Val;
68 InputFile(const FileEntry *File,
69 bool isOverridden = false, bool isOutOfDate = false) {
70 assert(!(isOverridden && isOutOfDate) &&
71 "an overridden cannot be out-of-date");
77 Val.setPointerAndInt(File, intVal);
80 static InputFile getNotFound() {
82 File.Val.setInt(NotFound);
86 const FileEntry *getFile() const { return Val.getPointer(); }
87 bool isOverridden() const { return Val.getInt() == Overridden; }
88 bool isOutOfDate() const { return Val.getInt() == OutOfDate; }
89 bool isNotFound() const { return Val.getInt() == NotFound; }
92 typedef unsigned ASTFileSignature;
94 /// \brief Information about a module that has been loaded by the ASTReader.
96 /// Each instance of the Module class corresponds to a single AST file, which
97 /// may be a precompiled header, precompiled preamble, a module, or an AST file
98 /// of some sort loaded as the main file, all of which are specific formulations
99 /// of the general notion of a "module". A module may depend on any number of
103 ModuleFile(ModuleKind Kind, unsigned Generation);
106 // === General information ===
108 /// \brief The index of this module in the list of modules.
111 /// \brief The type of this module.
114 /// \brief The file name of the module file.
115 std::string FileName;
117 /// \brief The name of the module.
118 std::string ModuleName;
120 /// \brief The base directory of the module.
121 std::string BaseDirectory;
123 std::string getTimestampFilename() const {
124 return FileName + ".timestamp";
127 /// \brief The original source file name that was used to build the
128 /// primary AST file, which may have been modified for
129 /// relocatable-pch support.
130 std::string OriginalSourceFileName;
132 /// \brief The actual original source file name that was used to
133 /// build this AST file.
134 std::string ActualOriginalSourceFileName;
136 /// \brief The file ID for the original source file that was used to
137 /// build this AST file.
138 FileID OriginalSourceFileID;
140 /// \brief The directory that the PCH was originally created in. Used to
141 /// allow resolving headers even after headers+PCH was moved to a new path.
142 std::string OriginalDir;
144 std::string ModuleMapPath;
146 /// \brief Whether this precompiled header is a relocatable PCH file.
149 /// \brief Whether timestamps are included in this module file.
152 /// \brief The file entry for the module file.
153 const FileEntry *File;
155 /// \brief The signature of the module file, which may be used along with size
156 /// and modification time to identify this particular file.
157 ASTFileSignature Signature;
159 /// \brief Whether this module has been directly imported by the
161 bool DirectlyImported;
163 /// \brief The generation of which this module file is a part.
166 /// \brief The memory buffer that stores the data associated with
168 std::unique_ptr<llvm::MemoryBuffer> Buffer;
170 /// \brief The size of this file, in bits.
173 /// \brief The global bit offset (or base) of this module
174 uint64_t GlobalBitOffset;
176 /// \brief The serialized bitstream data for this file.
179 /// \brief The main bitstream cursor for the main block.
180 llvm::BitstreamCursor Stream;
182 /// \brief The source location where the module was explicitly or implicitly
183 /// imported in the local translation unit.
185 /// If module A depends on and imports module B, both modules will have the
186 /// same DirectImportLoc, but different ImportLoc (B's ImportLoc will be a
187 /// source location inside module A).
189 /// WARNING: This is largely useless. It doesn't tell you when a module was
190 /// made visible, just when the first submodule of that module was imported.
191 SourceLocation DirectImportLoc;
193 /// \brief The source location where this module was first imported.
194 SourceLocation ImportLoc;
196 /// \brief The first source location in this module.
197 SourceLocation FirstLoc;
199 /// The list of extension readers that are attached to this module
201 std::vector<std::unique_ptr<ModuleFileExtensionReader>> ExtensionReaders;
203 // === Input Files ===
204 /// \brief The cursor to the start of the input-files block.
205 llvm::BitstreamCursor InputFilesCursor;
207 /// \brief Offsets for all of the input file entries in the AST file.
208 const llvm::support::unaligned_uint64_t *InputFileOffsets;
210 /// \brief The input files that have been loaded from this AST file.
211 std::vector<InputFile> InputFilesLoaded;
213 /// \brief If non-zero, specifies the time when we last validated input
214 /// files. Zero means we never validated them.
216 /// The time is specified in seconds since the start of the Epoch.
217 uint64_t InputFilesValidationTimestamp;
219 // === Source Locations ===
221 /// \brief Cursor used to read source location entries.
222 llvm::BitstreamCursor SLocEntryCursor;
224 /// \brief The number of source location entries in this AST file.
225 unsigned LocalNumSLocEntries;
227 /// \brief The base ID in the source manager's view of this module.
230 /// \brief The base offset in the source manager's view of this module.
231 unsigned SLocEntryBaseOffset;
233 /// \brief Offsets for all of the source location entries in the
235 const uint32_t *SLocEntryOffsets;
237 /// \brief SLocEntries that we're going to preload.
238 SmallVector<uint64_t, 4> PreloadSLocEntries;
240 /// \brief Remapping table for source locations in this module.
241 ContinuousRangeMap<uint32_t, int, 2> SLocRemap;
243 // === Identifiers ===
245 /// \brief The number of identifiers in this AST file.
246 unsigned LocalNumIdentifiers;
248 /// \brief Offsets into the identifier table data.
250 /// This array is indexed by the identifier ID (-1), and provides
251 /// the offset into IdentifierTableData where the string data is
253 const uint32_t *IdentifierOffsets;
255 /// \brief Base identifier ID for identifiers local to this module.
256 serialization::IdentID BaseIdentifierID;
258 /// \brief Remapping table for identifier IDs in this module.
259 ContinuousRangeMap<uint32_t, int, 2> IdentifierRemap;
261 /// \brief Actual data for the on-disk hash table of identifiers.
263 /// This pointer points into a memory buffer, where the on-disk hash
264 /// table for identifiers actually lives.
265 const char *IdentifierTableData;
267 /// \brief A pointer to an on-disk hash table of opaque type
268 /// IdentifierHashTable.
269 void *IdentifierLookupTable;
271 /// \brief Offsets of identifiers that we're going to preload within
272 /// IdentifierTableData.
273 std::vector<unsigned> PreloadIdentifierOffsets;
277 /// \brief The cursor to the start of the preprocessor block, which stores
278 /// all of the macro definitions.
279 llvm::BitstreamCursor MacroCursor;
281 /// \brief The number of macros in this AST file.
282 unsigned LocalNumMacros;
284 /// \brief Offsets of macros in the preprocessor block.
286 /// This array is indexed by the macro ID (-1), and provides
287 /// the offset into the preprocessor block where macro definitions are
289 const uint32_t *MacroOffsets;
291 /// \brief Base macro ID for macros local to this module.
292 serialization::MacroID BaseMacroID;
294 /// \brief Remapping table for macro IDs in this module.
295 ContinuousRangeMap<uint32_t, int, 2> MacroRemap;
297 /// \brief The offset of the start of the set of defined macros.
298 uint64_t MacroStartOffset;
300 // === Detailed PreprocessingRecord ===
302 /// \brief The cursor to the start of the (optional) detailed preprocessing
304 llvm::BitstreamCursor PreprocessorDetailCursor;
306 /// \brief The offset of the start of the preprocessor detail cursor.
307 uint64_t PreprocessorDetailStartOffset;
309 /// \brief Base preprocessed entity ID for preprocessed entities local to
311 serialization::PreprocessedEntityID BasePreprocessedEntityID;
313 /// \brief Remapping table for preprocessed entity IDs in this module.
314 ContinuousRangeMap<uint32_t, int, 2> PreprocessedEntityRemap;
316 const PPEntityOffset *PreprocessedEntityOffsets;
317 unsigned NumPreprocessedEntities;
319 // === Header search information ===
321 /// \brief The number of local HeaderFileInfo structures.
322 unsigned LocalNumHeaderFileInfos;
324 /// \brief Actual data for the on-disk hash table of header file
327 /// This pointer points into a memory buffer, where the on-disk hash
328 /// table for header file information actually lives.
329 const char *HeaderFileInfoTableData;
331 /// \brief The on-disk hash table that contains information about each of
332 /// the header files.
333 void *HeaderFileInfoTable;
335 // === Submodule information ===
336 /// \brief The number of submodules in this module.
337 unsigned LocalNumSubmodules;
339 /// \brief Base submodule ID for submodules local to this module.
340 serialization::SubmoduleID BaseSubmoduleID;
342 /// \brief Remapping table for submodule IDs in this module.
343 ContinuousRangeMap<uint32_t, int, 2> SubmoduleRemap;
347 /// \brief The number of selectors new to this file.
349 /// This is the number of entries in SelectorOffsets.
350 unsigned LocalNumSelectors;
352 /// \brief Offsets into the selector lookup table's data array
353 /// where each selector resides.
354 const uint32_t *SelectorOffsets;
356 /// \brief Base selector ID for selectors local to this module.
357 serialization::SelectorID BaseSelectorID;
359 /// \brief Remapping table for selector IDs in this module.
360 ContinuousRangeMap<uint32_t, int, 2> SelectorRemap;
362 /// \brief A pointer to the character data that comprises the selector table
364 /// The SelectorOffsets table refers into this memory.
365 const unsigned char *SelectorLookupTableData;
367 /// \brief A pointer to an on-disk hash table of opaque type
368 /// ASTSelectorLookupTable.
370 /// This hash table provides the IDs of all selectors, and the associated
371 /// instance and factory methods.
372 void *SelectorLookupTable;
374 // === Declarations ===
376 /// DeclsCursor - This is a cursor to the start of the DECLS_BLOCK block. It
377 /// has read all the abbreviations at the start of the block and is ready to
378 /// jump around with these in context.
379 llvm::BitstreamCursor DeclsCursor;
381 /// \brief The number of declarations in this AST file.
382 unsigned LocalNumDecls;
384 /// \brief Offset of each declaration within the bitstream, indexed
385 /// by the declaration ID (-1).
386 const DeclOffset *DeclOffsets;
388 /// \brief Base declaration ID for declarations local to this module.
389 serialization::DeclID BaseDeclID;
391 /// \brief Remapping table for declaration IDs in this module.
392 ContinuousRangeMap<uint32_t, int, 2> DeclRemap;
394 /// \brief Mapping from the module files that this module file depends on
395 /// to the base declaration ID for that module as it is understood within this
398 /// This is effectively a reverse global-to-local mapping for declaration
399 /// IDs, so that we can interpret a true global ID (for this translation unit)
400 /// as a local ID (for this module file).
401 llvm::DenseMap<ModuleFile *, serialization::DeclID> GlobalToLocalDeclIDs;
403 /// \brief Array of file-level DeclIDs sorted by file.
404 const serialization::DeclID *FileSortedDecls;
405 unsigned NumFileSortedDecls;
407 /// \brief Array of category list location information within this
408 /// module file, sorted by the definition ID.
409 const serialization::ObjCCategoriesInfo *ObjCCategoriesMap;
411 /// \brief The number of redeclaration info entries in ObjCCategoriesMap.
412 unsigned LocalNumObjCCategoriesInMap;
414 /// \brief The Objective-C category lists for categories known to this
416 SmallVector<uint64_t, 1> ObjCCategories;
420 /// \brief The number of types in this AST file.
421 unsigned LocalNumTypes;
423 /// \brief Offset of each type within the bitstream, indexed by the
424 /// type ID, or the representation of a Type*.
425 const uint32_t *TypeOffsets;
427 /// \brief Base type ID for types local to this module as represented in
428 /// the global type ID space.
429 serialization::TypeID BaseTypeIndex;
431 /// \brief Remapping table for type IDs in this module.
432 ContinuousRangeMap<uint32_t, int, 2> TypeRemap;
434 // === Miscellaneous ===
436 /// \brief Diagnostic IDs and their mappings that the user changed.
437 SmallVector<uint64_t, 8> PragmaDiagMappings;
439 /// \brief List of modules which depend on this module
440 llvm::SetVector<ModuleFile *> ImportedBy;
442 /// \brief List of modules which this module depends on
443 llvm::SetVector<ModuleFile *> Imports;
445 /// \brief Determine whether this module was directly imported at
446 /// any point during translation.
447 bool isDirectlyImported() const { return DirectlyImported; }
449 /// \brief Is this a module file for a module (rather than a PCH or similar).
450 bool isModule() const {
451 return Kind == MK_ImplicitModule || Kind == MK_ExplicitModule ||
452 Kind == MK_PrebuiltModule;
455 /// \brief Dump debugging output for this module.
459 } // end namespace serialization
461 } // end namespace clang