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//===- ModuleFile.h - Module file description -------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the Module class, which describes a module that has
// been loaded from an AST file.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_SERIALIZATION_MODULEFILE_H
#define LLVM_CLANG_SERIALIZATION_MODULEFILE_H
#include "clang/Basic/FileManager.h"
#include "clang/Basic/Module.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Serialization/ASTBitCodes.h"
#include "clang/Serialization/ContinuousRangeMap.h"
#include "clang/Serialization/ModuleFileExtension.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/PointerIntPair.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Bitstream/BitstreamReader.h"
#include "llvm/Support/Endian.h"
#include <cassert>
#include <cstdint>
#include <memory>
#include <string>
#include <vector>
namespace clang {
namespace serialization {
/// Specifies the kind of module that has been loaded.
enum ModuleKind {
/// File is an implicitly-loaded module.
MK_ImplicitModule,
/// File is an explicitly-loaded module.
MK_ExplicitModule,
/// File is a PCH file treated as such.
MK_PCH,
/// File is a PCH file treated as the preamble.
MK_Preamble,
/// File is a PCH file treated as the actual main file.
MK_MainFile,
/// File is from a prebuilt module path.
MK_PrebuiltModule
};
/// The input file info that has been loaded from an AST file.
struct InputFileInfo {
std::string FilenameAsRequested;
std::string Filename;
uint64_t ContentHash;
off_t StoredSize;
time_t StoredTime;
bool Overridden;
bool Transient;
bool TopLevel;
bool ModuleMap;
};
/// The input file that has been loaded from this AST file, along with
/// bools indicating whether this was an overridden buffer or if it was
/// out-of-date or not-found.
class InputFile {
enum {
Overridden = 1,
OutOfDate = 2,
NotFound = 3
};
llvm::PointerIntPair<const FileEntryRef::MapEntry *, 2, unsigned> Val;
public:
InputFile() = default;
InputFile(FileEntryRef File, bool isOverridden = false,
bool isOutOfDate = false) {
assert(!(isOverridden && isOutOfDate) &&
"an overridden cannot be out-of-date");
unsigned intVal = 0;
if (isOverridden)
intVal = Overridden;
else if (isOutOfDate)
intVal = OutOfDate;
Val.setPointerAndInt(&File.getMapEntry(), intVal);
}
static InputFile getNotFound() {
InputFile File;
File.Val.setInt(NotFound);
return File;
}
OptionalFileEntryRef getFile() const {
if (auto *P = Val.getPointer())
return FileEntryRef(*P);
return std::nullopt;
}
bool isOverridden() const { return Val.getInt() == Overridden; }
bool isOutOfDate() const { return Val.getInt() == OutOfDate; }
bool isNotFound() const { return Val.getInt() == NotFound; }
};
/// Information about a module that has been loaded by the ASTReader.
///
/// Each instance of the Module class corresponds to a single AST file, which
/// may be a precompiled header, precompiled preamble, a module, or an AST file
/// of some sort loaded as the main file, all of which are specific formulations
/// of the general notion of a "module". A module may depend on any number of
/// other modules.
class ModuleFile {
public:
ModuleFile(ModuleKind Kind, FileEntryRef File, unsigned Generation)
: Kind(Kind), File(File), Generation(Generation) {}
~ModuleFile();
// === General information ===
/// The index of this module in the list of modules.
unsigned Index = 0;
/// The type of this module.
ModuleKind Kind;
/// The file name of the module file.
std::string FileName;
/// The name of the module.
std::string ModuleName;
/// The base directory of the module.
std::string BaseDirectory;
std::string getTimestampFilename() const {
return FileName + ".timestamp";
}
/// The original source file name that was used to build the
/// primary AST file, which may have been modified for
/// relocatable-pch support.
std::string OriginalSourceFileName;
/// The actual original source file name that was used to
/// build this AST file.
std::string ActualOriginalSourceFileName;
/// The file ID for the original source file that was used to
/// build this AST file.
FileID OriginalSourceFileID;
std::string ModuleMapPath;
/// Whether this precompiled header is a relocatable PCH file.
bool RelocatablePCH = false;
/// Whether this module file is a standard C++ module.
bool StandardCXXModule = false;
/// Whether timestamps are included in this module file.
bool HasTimestamps = false;
/// Whether the top-level module has been read from the AST file.
bool DidReadTopLevelSubmodule = false;
/// The file entry for the module file.
FileEntryRef File;
/// The signature of the module file, which may be used instead of the size
/// and modification time to identify this particular file.
ASTFileSignature Signature;
/// The signature of the AST block of the module file, this can be used to
/// unique module files based on AST contents.
ASTFileSignature ASTBlockHash;
/// The bit vector denoting usage of each header search entry (true = used).
llvm::BitVector SearchPathUsage;
/// The bit vector denoting usage of each VFS entry (true = used).
llvm::BitVector VFSUsage;
/// Whether this module has been directly imported by the
/// user.
bool DirectlyImported = false;
/// The generation of which this module file is a part.
unsigned Generation;
/// The memory buffer that stores the data associated with
/// this AST file, owned by the InMemoryModuleCache.
llvm::MemoryBuffer *Buffer = nullptr;
/// The size of this file, in bits.
uint64_t SizeInBits = 0;
/// The global bit offset (or base) of this module
uint64_t GlobalBitOffset = 0;
/// The bit offset of the AST block of this module.
uint64_t ASTBlockStartOffset = 0;
/// The serialized bitstream data for this file.
StringRef Data;
/// The main bitstream cursor for the main block.
llvm::BitstreamCursor Stream;
/// The source location where the module was explicitly or implicitly
/// imported in the local translation unit.
///
/// If module A depends on and imports module B, both modules will have the
/// same DirectImportLoc, but different ImportLoc (B's ImportLoc will be a
/// source location inside module A).
///
/// WARNING: This is largely useless. It doesn't tell you when a module was
/// made visible, just when the first submodule of that module was imported.
SourceLocation DirectImportLoc;
/// The source location where this module was first imported.
SourceLocation ImportLoc;
/// The first source location in this module.
SourceLocation FirstLoc;
/// The list of extension readers that are attached to this module
/// file.
std::vector<std::unique_ptr<ModuleFileExtensionReader>> ExtensionReaders;
/// The module offset map data for this file. If non-empty, the various
/// ContinuousRangeMaps described below have not yet been populated.
StringRef ModuleOffsetMap;
// === Input Files ===
/// The cursor to the start of the input-files block.
llvm::BitstreamCursor InputFilesCursor;
/// Absolute offset of the start of the input-files block.
uint64_t InputFilesOffsetBase = 0;
/// Relative offsets for all of the input file entries in the AST file.
const llvm::support::unaligned_uint64_t *InputFileOffsets = nullptr;
/// The input files that have been loaded from this AST file.
std::vector<InputFile> InputFilesLoaded;
/// The input file infos that have been loaded from this AST file.
std::vector<InputFileInfo> InputFileInfosLoaded;
// All user input files reside at the index range [0, NumUserInputFiles), and
// system input files reside at [NumUserInputFiles, InputFilesLoaded.size()).
unsigned NumUserInputFiles = 0;
/// If non-zero, specifies the time when we last validated input
/// files. Zero means we never validated them.
///
/// The time is specified in seconds since the start of the Epoch.
uint64_t InputFilesValidationTimestamp = 0;
// === Source Locations ===
/// Cursor used to read source location entries.
llvm::BitstreamCursor SLocEntryCursor;
/// The bit offset to the start of the SOURCE_MANAGER_BLOCK.
uint64_t SourceManagerBlockStartOffset = 0;
/// The number of source location entries in this AST file.
unsigned LocalNumSLocEntries = 0;
/// The base ID in the source manager's view of this module.
int SLocEntryBaseID = 0;
/// The base offset in the source manager's view of this module.
SourceLocation::UIntTy SLocEntryBaseOffset = 0;
/// Base file offset for the offsets in SLocEntryOffsets. Real file offset
/// for the entry is SLocEntryOffsetsBase + SLocEntryOffsets[i].
uint64_t SLocEntryOffsetsBase = 0;
/// Offsets for all of the source location entries in the
/// AST file.
const uint32_t *SLocEntryOffsets = nullptr;
// === Identifiers ===
/// The number of identifiers in this AST file.
unsigned LocalNumIdentifiers = 0;
/// Offsets into the identifier table data.
///
/// This array is indexed by the identifier ID (-1), and provides
/// the offset into IdentifierTableData where the string data is
/// stored.
const uint32_t *IdentifierOffsets = nullptr;
/// Base identifier ID for identifiers local to this module.
serialization::IdentifierID BaseIdentifierID = 0;
/// Actual data for the on-disk hash table of identifiers.
///
/// This pointer points into a memory buffer, where the on-disk hash
/// table for identifiers actually lives.
const unsigned char *IdentifierTableData = nullptr;
/// A pointer to an on-disk hash table of opaque type
/// IdentifierHashTable.
void *IdentifierLookupTable = nullptr;
/// Offsets of identifiers that we're going to preload within
/// IdentifierTableData.
std::vector<unsigned> PreloadIdentifierOffsets;
// === Macros ===
/// The cursor to the start of the preprocessor block, which stores
/// all of the macro definitions.
llvm::BitstreamCursor MacroCursor;
/// The number of macros in this AST file.
unsigned LocalNumMacros = 0;
/// Base file offset for the offsets in MacroOffsets. Real file offset for
/// the entry is MacroOffsetsBase + MacroOffsets[i].
uint64_t MacroOffsetsBase = 0;
/// Offsets of macros in the preprocessor block.
///
/// This array is indexed by the macro ID (-1), and provides
/// the offset into the preprocessor block where macro definitions are
/// stored.
const uint32_t *MacroOffsets = nullptr;
/// Base macro ID for macros local to this module.
serialization::MacroID BaseMacroID = 0;
/// Remapping table for macro IDs in this module.
ContinuousRangeMap<uint32_t, int, 2> MacroRemap;
/// The offset of the start of the set of defined macros.
uint64_t MacroStartOffset = 0;
// === Detailed PreprocessingRecord ===
/// The cursor to the start of the (optional) detailed preprocessing
/// record block.
llvm::BitstreamCursor PreprocessorDetailCursor;
/// The offset of the start of the preprocessor detail cursor.
uint64_t PreprocessorDetailStartOffset = 0;
/// Base preprocessed entity ID for preprocessed entities local to
/// this module.
serialization::PreprocessedEntityID BasePreprocessedEntityID = 0;
/// Remapping table for preprocessed entity IDs in this module.
ContinuousRangeMap<uint32_t, int, 2> PreprocessedEntityRemap;
const PPEntityOffset *PreprocessedEntityOffsets = nullptr;
unsigned NumPreprocessedEntities = 0;
/// Base ID for preprocessed skipped ranges local to this module.
unsigned BasePreprocessedSkippedRangeID = 0;
const PPSkippedRange *PreprocessedSkippedRangeOffsets = nullptr;
unsigned NumPreprocessedSkippedRanges = 0;
// === Header search information ===
/// The number of local HeaderFileInfo structures.
unsigned LocalNumHeaderFileInfos = 0;
/// Actual data for the on-disk hash table of header file
/// information.
///
/// This pointer points into a memory buffer, where the on-disk hash
/// table for header file information actually lives.
const char *HeaderFileInfoTableData = nullptr;
/// The on-disk hash table that contains information about each of
/// the header files.
void *HeaderFileInfoTable = nullptr;
// === Submodule information ===
/// The number of submodules in this module.
unsigned LocalNumSubmodules = 0;
/// Base submodule ID for submodules local to this module.
serialization::SubmoduleID BaseSubmoduleID = 0;
/// Remapping table for submodule IDs in this module.
ContinuousRangeMap<uint32_t, int, 2> SubmoduleRemap;
// === Selectors ===
/// The number of selectors new to this file.
///
/// This is the number of entries in SelectorOffsets.
unsigned LocalNumSelectors = 0;
/// Offsets into the selector lookup table's data array
/// where each selector resides.
const uint32_t *SelectorOffsets = nullptr;
/// Base selector ID for selectors local to this module.
serialization::SelectorID BaseSelectorID = 0;
/// Remapping table for selector IDs in this module.
ContinuousRangeMap<uint32_t, int, 2> SelectorRemap;
/// A pointer to the character data that comprises the selector table
///
/// The SelectorOffsets table refers into this memory.
const unsigned char *SelectorLookupTableData = nullptr;
/// A pointer to an on-disk hash table of opaque type
/// ASTSelectorLookupTable.
///
/// This hash table provides the IDs of all selectors, and the associated
/// instance and factory methods.
void *SelectorLookupTable = nullptr;
// === Declarations ===
/// DeclsCursor - This is a cursor to the start of the DECLTYPES_BLOCK block.
/// It has read all the abbreviations at the start of the block and is ready
/// to jump around with these in context.
llvm::BitstreamCursor DeclsCursor;
/// The offset to the start of the DECLTYPES_BLOCK block.
uint64_t DeclsBlockStartOffset = 0;
/// The number of declarations in this AST file.
unsigned LocalNumDecls = 0;
/// Offset of each declaration within the bitstream, indexed
/// by the declaration ID (-1).
const DeclOffset *DeclOffsets = nullptr;
/// Base declaration index in ASTReader for declarations local to this module.
unsigned BaseDeclIndex = 0;
/// Array of file-level DeclIDs sorted by file.
const serialization::unaligned_decl_id_t *FileSortedDecls = nullptr;
unsigned NumFileSortedDecls = 0;
/// Array of category list location information within this
/// module file, sorted by the definition ID.
const serialization::ObjCCategoriesInfo *ObjCCategoriesMap = nullptr;
/// The number of redeclaration info entries in ObjCCategoriesMap.
unsigned LocalNumObjCCategoriesInMap = 0;
/// The Objective-C category lists for categories known to this
/// module.
SmallVector<uint64_t, 1> ObjCCategories;
// === Types ===
/// The number of types in this AST file.
unsigned LocalNumTypes = 0;
/// Offset of each type within the bitstream, indexed by the
/// type ID, or the representation of a Type*.
const UnalignedUInt64 *TypeOffsets = nullptr;
/// Base type ID for types local to this module as represented in
/// the global type ID space.
serialization::TypeID BaseTypeIndex = 0;
// === Miscellaneous ===
/// Diagnostic IDs and their mappings that the user changed.
SmallVector<uint64_t, 8> PragmaDiagMappings;
/// List of modules which depend on this module
llvm::SetVector<ModuleFile *> ImportedBy;
/// List of modules which this module directly imported
llvm::SetVector<ModuleFile *> Imports;
/// List of modules which this modules dependent on. Different
/// from `Imports`, this includes indirectly imported modules too.
/// The order of TransitiveImports is significant. It should keep
/// the same order with that module file manager when we write
/// the current module file. The value of the member will be initialized
/// in `ASTReader::ReadModuleOffsetMap`.
llvm::SmallVector<ModuleFile *, 16> TransitiveImports;
/// Determine whether this module was directly imported at
/// any point during translation.
bool isDirectlyImported() const { return DirectlyImported; }
/// Is this a module file for a module (rather than a PCH or similar).
bool isModule() const {
return Kind == MK_ImplicitModule || Kind == MK_ExplicitModule ||
Kind == MK_PrebuiltModule;
}
/// Dump debugging output for this module.
void dump();
};
} // namespace serialization
} // namespace clang
#endif // LLVM_CLANG_SERIALIZATION_MODULEFILE_H
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