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//===--- SourceManager.h - Track and cache source files ---------*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This file defines the SourceManager interface.
#include "clang/Basic/SourceLocation.h"
#include "llvm/Support/Allocator.h"
#include "llvm/System/DataTypes.h"
#include "llvm/ADT/DenseMap.h"
#include <vector>
#include <cassert>
namespace llvm {
class MemoryBuffer;
namespace clang {
class SourceManager;
class FileManager;
class FileEntry;
class IdentifierTokenInfo;
class LineTableInfo;
/// SrcMgr - Public enums and private classes that are part of the
/// SourceManager implementation.
namespace SrcMgr {
/// CharacteristicKind - This is used to represent whether a file or directory
/// holds normal user code, system code, or system code which is implicitly
/// 'extern "C"' in C++ mode. Entire directories can be tagged with this
/// (this is maintained by DirectoryLookup and friends) as can specific
/// FileIDInfos when a #pragma system_header is seen or various other cases.
enum CharacteristicKind {
C_User, C_System, C_ExternCSystem
/// ContentCache - Once instance of this struct is kept for every file
/// loaded or used. This object owns the MemoryBuffer object.
class ContentCache {
/// Buffer - The actual buffer containing the characters from the input
/// file. This is owned by the ContentCache object.
mutable const llvm::MemoryBuffer *Buffer;
/// Reference to the file entry. This reference does not own
/// the FileEntry object. It is possible for this to be NULL if
/// the ContentCache encapsulates an imaginary text buffer.
const FileEntry *Entry;
/// SourceLineCache - A bump pointer allocated array of offsets for each
/// source line. This is lazily computed. This is owned by the
/// SourceManager BumpPointerAllocator object.
unsigned *SourceLineCache;
/// NumLines - The number of lines in this ContentCache. This is only valid
/// if SourceLineCache is non-null.
unsigned NumLines;
/// getBuffer - Returns the memory buffer for the associated content. If
/// there is an error opening this buffer the first time, this manufactures
/// a temporary buffer and returns a non-empty error string.
const llvm::MemoryBuffer *getBuffer(std::string *ErrorStr = 0) const;
/// getSize - Returns the size of the content encapsulated by this
/// ContentCache. This can be the size of the source file or the size of an
/// arbitrary scratch buffer. If the ContentCache encapsulates a source
/// file this size is retrieved from the file's FileEntry.
unsigned getSize() const;
/// getSizeBytesMapped - Returns the number of bytes actually mapped for
/// this ContentCache. This can be 0 if the MemBuffer was not actually
/// instantiated.
unsigned getSizeBytesMapped() const;
void setBuffer(const llvm::MemoryBuffer *B) {
assert(!Buffer && "MemoryBuffer already set.");
Buffer = B;
/// \brief Replace the existing buffer (which will be deleted)
/// with the given buffer.
void replaceBuffer(const llvm::MemoryBuffer *B);
ContentCache(const FileEntry *Ent = 0)
: Buffer(0), Entry(Ent), SourceLineCache(0), NumLines(0) {}
/// The copy ctor does not allow copies where source object has either
/// a non-NULL Buffer or SourceLineCache. Ownership of allocated memory
/// is not transfered, so this is a logical error.
ContentCache(const ContentCache &RHS) : Buffer(0), SourceLineCache(0) {
Entry = RHS.Entry;
assert (RHS.Buffer == 0 && RHS.SourceLineCache == 0
&& "Passed ContentCache object cannot own a buffer.");
NumLines = RHS.NumLines;
// Disable assignments.
ContentCache &operator=(const ContentCache& RHS);
/// FileInfo - Information about a FileID, basically just the logical file
/// that it represents and include stack information.
/// Each FileInfo has include stack information, indicating where it came
/// from. This information encodes the #include chain that a token was
/// instantiated from. The main include file has an invalid IncludeLoc.
/// FileInfos contain a "ContentCache *", with the contents of the file.
class FileInfo {
/// IncludeLoc - The location of the #include that brought in this file.
/// This is an invalid SLOC for the main file (top of the #include chain).
unsigned IncludeLoc; // Really a SourceLocation
/// Data - This contains the ContentCache* and the bits indicating the
/// characteristic of the file and whether it has #line info, all bitmangled
/// together.
uintptr_t Data;
/// get - Return a FileInfo object.
static FileInfo get(SourceLocation IL, const ContentCache *Con,
CharacteristicKind FileCharacter) {
FileInfo X;
X.IncludeLoc = IL.getRawEncoding();
X.Data = (uintptr_t)Con;
assert((X.Data & 7) == 0 &&"ContentCache pointer insufficiently aligned");
assert((unsigned)FileCharacter < 4 && "invalid file character");
X.Data |= (unsigned)FileCharacter;
return X;
SourceLocation getIncludeLoc() const {
return SourceLocation::getFromRawEncoding(IncludeLoc);
const ContentCache* getContentCache() const {
return reinterpret_cast<const ContentCache*>(Data & ~7UL);
/// getCharacteristic - Return whether this is a system header or not.
CharacteristicKind getFileCharacteristic() const {
return (CharacteristicKind)(Data & 3);
/// hasLineDirectives - Return true if this FileID has #line directives in
/// it.
bool hasLineDirectives() const { return (Data & 4) != 0; }
/// setHasLineDirectives - Set the flag that indicates that this FileID has
/// line table entries associated with it.
void setHasLineDirectives() {
Data |= 4;
/// InstantiationInfo - Each InstantiationInfo encodes the Instantiation
/// location - where the token was ultimately instantiated, and the
/// SpellingLoc - where the actual character data for the token came from.
class InstantiationInfo {
// Really these are all SourceLocations.
/// SpellingLoc - Where the spelling for the token can be found.
unsigned SpellingLoc;
/// InstantiationLocStart/InstantiationLocEnd - In a macro expansion, these
/// indicate the start and end of the instantiation. In object-like macros,
/// these will be the same. In a function-like macro instantiation, the
/// start will be the identifier and the end will be the ')'.
unsigned InstantiationLocStart, InstantiationLocEnd;
SourceLocation getSpellingLoc() const {
return SourceLocation::getFromRawEncoding(SpellingLoc);
SourceLocation getInstantiationLocStart() const {
return SourceLocation::getFromRawEncoding(InstantiationLocStart);
SourceLocation getInstantiationLocEnd() const {
return SourceLocation::getFromRawEncoding(InstantiationLocEnd);
std::pair<SourceLocation,SourceLocation> getInstantiationLocRange() const {
return std::make_pair(getInstantiationLocStart(),
/// get - Return a InstantiationInfo for an expansion. IL specifies
/// the instantiation location (where the macro is expanded), and SL
/// specifies the spelling location (where the characters from the token
/// come from). IL and PL can both refer to normal File SLocs or
/// instantiation locations.
static InstantiationInfo get(SourceLocation ILStart, SourceLocation ILEnd,
SourceLocation SL) {
InstantiationInfo X;
X.SpellingLoc = SL.getRawEncoding();
X.InstantiationLocStart = ILStart.getRawEncoding();
X.InstantiationLocEnd = ILEnd.getRawEncoding();
return X;
/// SLocEntry - This is a discriminated union of FileInfo and
/// InstantiationInfo. SourceManager keeps an array of these objects, and
/// they are uniquely identified by the FileID datatype.
class SLocEntry {
unsigned Offset; // low bit is set for instantiation info.
union {
FileInfo File;
InstantiationInfo Instantiation;
unsigned getOffset() const { return Offset >> 1; }
bool isInstantiation() const { return Offset & 1; }
bool isFile() const { return !isInstantiation(); }
const FileInfo &getFile() const {
assert(isFile() && "Not a file SLocEntry!");
return File;
const InstantiationInfo &getInstantiation() const {
assert(isInstantiation() && "Not an instantiation SLocEntry!");
return Instantiation;
static SLocEntry get(unsigned Offset, const FileInfo &FI) {
SLocEntry E;
E.Offset = Offset << 1;
E.File = FI;
return E;
static SLocEntry get(unsigned Offset, const InstantiationInfo &II) {
SLocEntry E;
E.Offset = (Offset << 1) | 1;
E.Instantiation = II;
return E;
} // end SrcMgr namespace.
/// \brief External source of source location entries.
class ExternalSLocEntrySource {
virtual ~ExternalSLocEntrySource();
/// \brief Read the source location entry with index ID.
virtual void ReadSLocEntry(unsigned ID) = 0;
/// SourceManager - This file handles loading and caching of source files into
/// memory. This object owns the MemoryBuffer objects for all of the loaded
/// files and assigns unique FileID's for each unique #include chain.
/// The SourceManager can be queried for information about SourceLocation
/// objects, turning them into either spelling or instantiation locations.
/// Spelling locations represent where the bytes corresponding to a token came
/// from and instantiation locations represent where the location is in the
/// user's view. In the case of a macro expansion, for example, the spelling
/// location indicates where the expanded token came from and the instantiation
/// location specifies where it was expanded.
class SourceManager {
mutable llvm::BumpPtrAllocator ContentCacheAlloc;
/// FileInfos - Memoized information about all of the files tracked by this
/// SourceManager. This set allows us to merge ContentCache entries based
/// on their FileEntry*. All ContentCache objects will thus have unique,
/// non-null, FileEntry pointers.
llvm::DenseMap<const FileEntry*, SrcMgr::ContentCache*> FileInfos;
/// MemBufferInfos - Information about various memory buffers that we have
/// read in. All FileEntry* within the stored ContentCache objects are NULL,
/// as they do not refer to a file.
std::vector<SrcMgr::ContentCache*> MemBufferInfos;
/// SLocEntryTable - This is an array of SLocEntry's that we have created.
/// FileID is an index into this vector. This array is sorted by the offset.
std::vector<SrcMgr::SLocEntry> SLocEntryTable;
/// NextOffset - This is the next available offset that a new SLocEntry can
/// start at. It is SLocEntryTable.back().getOffset()+size of back() entry.
unsigned NextOffset;
/// \brief If source location entries are being lazily loaded from
/// an external source, this vector indicates whether the Ith source
/// location entry has already been loaded from the external storage.
std::vector<bool> SLocEntryLoaded;
/// \brief An external source for source location entries.
ExternalSLocEntrySource *ExternalSLocEntries;
/// LastFileIDLookup - This is a one-entry cache to speed up getFileID.
/// LastFileIDLookup records the last FileID looked up or created, because it
/// is very common to look up many tokens from the same file.
mutable FileID LastFileIDLookup;
/// LineTable - This holds information for #line directives. It is referenced
/// by indices from SLocEntryTable.
LineTableInfo *LineTable;
/// LastLineNo - These ivars serve as a cache used in the getLineNumber
/// method which is used to speedup getLineNumber calls to nearby locations.
mutable FileID LastLineNoFileIDQuery;
mutable SrcMgr::ContentCache *LastLineNoContentCache;
mutable unsigned LastLineNoFilePos;
mutable unsigned LastLineNoResult;
/// MainFileID - The file ID for the main source file of the translation unit.
FileID MainFileID;
// Statistics for -print-stats.
mutable unsigned NumLinearScans, NumBinaryProbes;
// Cache results for the isBeforeInTranslationUnit method.
mutable FileID LastLFIDForBeforeTUCheck;
mutable FileID LastRFIDForBeforeTUCheck;
mutable bool LastResForBeforeTUCheck;
// SourceManager doesn't support copy construction.
explicit SourceManager(const SourceManager&);
void operator=(const SourceManager&);
: ExternalSLocEntries(0), LineTable(0), NumLinearScans(0),
NumBinaryProbes(0) {
void clearIDTables();
// MainFileID creation and querying methods.
/// getMainFileID - Returns the FileID of the main source file.
FileID getMainFileID() const { return MainFileID; }
/// createMainFileID - Create the FileID for the main source file.
FileID createMainFileID(const FileEntry *SourceFile,
SourceLocation IncludePos) {
assert(MainFileID.isInvalid() && "MainFileID already set!");
MainFileID = createFileID(SourceFile, IncludePos, SrcMgr::C_User);
return MainFileID;
// Methods to create new FileID's and instantiations.
/// createFileID - Create a new FileID that represents the specified file
/// being #included from the specified IncludePosition. This returns 0 on
/// error and translates NULL into standard input.
/// PreallocateID should be non-zero to specify which a pre-allocated,
/// lazily computed source location is being filled in by this operation.
FileID createFileID(const FileEntry *SourceFile, SourceLocation IncludePos,
SrcMgr::CharacteristicKind FileCharacter,
unsigned PreallocatedID = 0,
unsigned Offset = 0) {
const SrcMgr::ContentCache *IR = getOrCreateContentCache(SourceFile);
if (IR == 0) return FileID(); // Error opening file?
return createFileID(IR, IncludePos, FileCharacter, PreallocatedID, Offset);
/// createFileIDForMemBuffer - Create a new FileID that represents the
/// specified memory buffer. This does no caching of the buffer and takes
/// ownership of the MemoryBuffer, so only pass a MemoryBuffer to this once.
FileID createFileIDForMemBuffer(const llvm::MemoryBuffer *Buffer,
unsigned PreallocatedID = 0,
unsigned Offset = 0) {
return createFileID(createMemBufferContentCache(Buffer), SourceLocation(),
SrcMgr::C_User, PreallocatedID, Offset);
/// createMainFileIDForMembuffer - Create the FileID for a memory buffer
/// that will represent the FileID for the main source. One example
/// of when this would be used is when the main source is read from STDIN.
FileID createMainFileIDForMemBuffer(const llvm::MemoryBuffer *Buffer) {
assert(MainFileID.isInvalid() && "MainFileID already set!");
MainFileID = createFileIDForMemBuffer(Buffer);
return MainFileID;
/// createInstantiationLoc - Return a new SourceLocation that encodes the fact
/// that a token at Loc should actually be referenced from InstantiationLoc.
/// TokLength is the length of the token being instantiated.
SourceLocation createInstantiationLoc(SourceLocation Loc,
SourceLocation InstantiationLocStart,
SourceLocation InstantiationLocEnd,
unsigned TokLength,
unsigned PreallocatedID = 0,
unsigned Offset = 0);
/// \brief Retrieve the memory buffer associated with the given file.
const llvm::MemoryBuffer *getMemoryBufferForFile(const FileEntry *File);
/// \brief Override the contents of the given source file by providing an
/// already-allocated buffer.
/// \param SourceFile the source file whose contents will be override.
/// \param Buffer the memory buffer whose contents will be used as the
/// data in the given source file.
/// \returns true if an error occurred, false otherwise.
bool overrideFileContents(const FileEntry *SourceFile,
const llvm::MemoryBuffer *Buffer);
// FileID manipulation methods.
/// getBuffer - Return the buffer for the specified FileID. If there is an
/// error opening this buffer the first time, this manufactures a temporary
/// buffer and returns a non-empty error string.
const llvm::MemoryBuffer *getBuffer(FileID FID, std::string *Error = 0) const{
return getSLocEntry(FID).getFile().getContentCache()->getBuffer(Error);
/// getFileEntryForID - Returns the FileEntry record for the provided FileID.
const FileEntry *getFileEntryForID(FileID FID) const {
return getSLocEntry(FID).getFile().getContentCache()->Entry;
/// getBufferData - Return a pointer to the start and end of the source buffer
/// data for the specified FileID.
std::pair<const char*, const char*> getBufferData(FileID FID) const;
// SourceLocation manipulation methods.
/// getFileID - Return the FileID for a SourceLocation. This is a very
/// hot method that is used for all SourceManager queries that start with a
/// SourceLocation object. It is responsible for finding the entry in
/// SLocEntryTable which contains the specified location.
FileID getFileID(SourceLocation SpellingLoc) const {
unsigned SLocOffset = SpellingLoc.getOffset();
// If our one-entry cache covers this offset, just return it.
if (isOffsetInFileID(LastFileIDLookup, SLocOffset))
return LastFileIDLookup;
return getFileIDSlow(SLocOffset);
/// getLocForStartOfFile - Return the source location corresponding to the
/// first byte of the specified file.
SourceLocation getLocForStartOfFile(FileID FID) const {
assert(FID.ID < SLocEntryTable.size() && "FileID out of range");
assert(getSLocEntry(FID).isFile() && "FileID is not a file");
unsigned FileOffset = getSLocEntry(FID).getOffset();
return SourceLocation::getFileLoc(FileOffset);
/// getInstantiationLoc - Given a SourceLocation object, return the
/// instantiation location referenced by the ID.
SourceLocation getInstantiationLoc(SourceLocation Loc) const {
// Handle the non-mapped case inline, defer to out of line code to handle
// instantiations.
if (Loc.isFileID()) return Loc;
return getInstantiationLocSlowCase(Loc);
/// getImmediateInstantiationRange - Loc is required to be an instantiation
/// location. Return the start/end of the instantiation information.
getImmediateInstantiationRange(SourceLocation Loc) const;
/// getInstantiationRange - Given a SourceLocation object, return the
/// range of tokens covered by the instantiation in the ultimate file.
getInstantiationRange(SourceLocation Loc) const;
/// getSpellingLoc - Given a SourceLocation object, return the spelling
/// location referenced by the ID. This is the place where the characters
/// that make up the lexed token can be found.
SourceLocation getSpellingLoc(SourceLocation Loc) const {
// Handle the non-mapped case inline, defer to out of line code to handle
// instantiations.
if (Loc.isFileID()) return Loc;
return getSpellingLocSlowCase(Loc);
/// getImmediateSpellingLoc - Given a SourceLocation object, return the
/// spelling location referenced by the ID. This is the first level down
/// towards the place where the characters that make up the lexed token can be
/// found. This should not generally be used by clients.
SourceLocation getImmediateSpellingLoc(SourceLocation Loc) const;
/// getDecomposedLoc - Decompose the specified location into a raw FileID +
/// Offset pair. The first element is the FileID, the second is the
/// offset from the start of the buffer of the location.
std::pair<FileID, unsigned> getDecomposedLoc(SourceLocation Loc) const {
FileID FID = getFileID(Loc);
return std::make_pair(FID, Loc.getOffset()-getSLocEntry(FID).getOffset());
/// getDecomposedInstantiationLoc - Decompose the specified location into a
/// raw FileID + Offset pair. If the location is an instantiation record,
/// walk through it until we find the final location instantiated.
std::pair<FileID, unsigned>
getDecomposedInstantiationLoc(SourceLocation Loc) const {
FileID FID = getFileID(Loc);
const SrcMgr::SLocEntry *E = &getSLocEntry(FID);
unsigned Offset = Loc.getOffset()-E->getOffset();
if (Loc.isFileID())
return std::make_pair(FID, Offset);
return getDecomposedInstantiationLocSlowCase(E, Offset);
/// getDecomposedSpellingLoc - Decompose the specified location into a raw
/// FileID + Offset pair. If the location is an instantiation record, walk
/// through it until we find its spelling record.
std::pair<FileID, unsigned>
getDecomposedSpellingLoc(SourceLocation Loc) const {
FileID FID = getFileID(Loc);
const SrcMgr::SLocEntry *E = &getSLocEntry(FID);
unsigned Offset = Loc.getOffset()-E->getOffset();
if (Loc.isFileID())
return std::make_pair(FID, Offset);
return getDecomposedSpellingLocSlowCase(E, Offset);
/// getFileOffset - This method returns the offset from the start
/// of the file that the specified SourceLocation represents. This is not very
/// meaningful for a macro ID.
unsigned getFileOffset(SourceLocation SpellingLoc) const {
return getDecomposedLoc(SpellingLoc).second;
// Queries about the code at a SourceLocation.
/// getCharacterData - Return a pointer to the start of the specified location
/// in the appropriate spelling MemoryBuffer.
const char *getCharacterData(SourceLocation SL) const;
/// getColumnNumber - Return the column # for the specified file position.
/// This is significantly cheaper to compute than the line number. This
/// returns zero if the column number isn't known. This may only be called on
/// a file sloc, so you must choose a spelling or instantiation location
/// before calling this method.
unsigned getColumnNumber(FileID FID, unsigned FilePos) const;
unsigned getSpellingColumnNumber(SourceLocation Loc) const;
unsigned getInstantiationColumnNumber(SourceLocation Loc) const;
/// getLineNumber - Given a SourceLocation, return the spelling line number
/// for the position indicated. This requires building and caching a table of
/// line offsets for the MemoryBuffer, so this is not cheap: use only when
/// about to emit a diagnostic.
unsigned getLineNumber(FileID FID, unsigned FilePos) const;
unsigned getInstantiationLineNumber(SourceLocation Loc) const;
unsigned getSpellingLineNumber(SourceLocation Loc) const;
/// Return the filename or buffer identifier of the buffer the location is in.
/// Note that this name does not respect #line directives. Use getPresumedLoc
/// for normal clients.
const char *getBufferName(SourceLocation Loc) const;
/// getFileCharacteristic - return the file characteristic of the specified
/// source location, indicating whether this is a normal file, a system
/// header, or an "implicit extern C" system header.
/// This state can be modified with flags on GNU linemarker directives like:
/// # 4 "foo.h" 3
/// which changes all source locations in the current file after that to be
/// considered to be from a system header.
SrcMgr::CharacteristicKind getFileCharacteristic(SourceLocation Loc) const;
/// getPresumedLoc - This method returns the "presumed" location of a
/// SourceLocation specifies. A "presumed location" can be modified by #line
/// or GNU line marker directives. This provides a view on the data that a
/// user should see in diagnostics, for example.
/// Note that a presumed location is always given as the instantiation point
/// of an instantiation location, not at the spelling location.
PresumedLoc getPresumedLoc(SourceLocation Loc) const;
/// isFromSameFile - Returns true if both SourceLocations correspond to
/// the same file.
bool isFromSameFile(SourceLocation Loc1, SourceLocation Loc2) const {
return getFileID(Loc1) == getFileID(Loc2);
/// isFromMainFile - Returns true if the file of provided SourceLocation is
/// the main file.
bool isFromMainFile(SourceLocation Loc) const {
return getFileID(Loc) == getMainFileID();
/// isInSystemHeader - Returns if a SourceLocation is in a system header.
bool isInSystemHeader(SourceLocation Loc) const {
return getFileCharacteristic(Loc) != SrcMgr::C_User;
/// isInExternCSystemHeader - Returns if a SourceLocation is in an "extern C"
/// system header.
bool isInExternCSystemHeader(SourceLocation Loc) const {
return getFileCharacteristic(Loc) == SrcMgr::C_ExternCSystem;
// Line Table Manipulation Routines
/// getLineTableFilenameID - Return the uniqued ID for the specified filename.
unsigned getLineTableFilenameID(const char *Ptr, unsigned Len);
/// AddLineNote - Add a line note to the line table for the FileID and offset
/// specified by Loc. If FilenameID is -1, it is considered to be
/// unspecified.
void AddLineNote(SourceLocation Loc, unsigned LineNo, int FilenameID);
void AddLineNote(SourceLocation Loc, unsigned LineNo, int FilenameID,
bool IsFileEntry, bool IsFileExit,
bool IsSystemHeader, bool IsExternCHeader);
/// \brief Determine if the source manager has a line table.
bool hasLineTable() const { return LineTable != 0; }
/// \brief Retrieve the stored line table.
LineTableInfo &getLineTable();
// Other miscellaneous methods.
/// \brief Get the source location for the given file:line:col triplet.
/// If the source file is included multiple times, the source location will
/// be based upon the first inclusion.
SourceLocation getLocation(const FileEntry *SourceFile,
unsigned Line, unsigned Col) const;
/// \brief Determines the order of 2 source locations in the translation unit.
/// \returns true if LHS source location comes before RHS, false otherwise.
bool isBeforeInTranslationUnit(SourceLocation LHS, SourceLocation RHS) const;
// Iterators over FileInfos.
typedef llvm::DenseMap<const FileEntry*, SrcMgr::ContentCache*>
::const_iterator fileinfo_iterator;
fileinfo_iterator fileinfo_begin() const { return FileInfos.begin(); }
fileinfo_iterator fileinfo_end() const { return FileInfos.end(); }
bool hasFileInfo(const FileEntry *File) const {
return FileInfos.find(File) != FileInfos.end();
/// PrintStats - Print statistics to stderr.
void PrintStats() const;
unsigned sloc_entry_size() const { return SLocEntryTable.size(); }
// FIXME: Exposing this is a little gross; what we want is a good way
// to iterate the entries that were not defined in a PCH file (or
// any other external source).
unsigned sloc_loaded_entry_size() const { return SLocEntryLoaded.size(); }
const SrcMgr::SLocEntry &getSLocEntry(unsigned ID) const {
assert(ID < SLocEntryTable.size() && "Invalid id");
if (ExternalSLocEntries &&
ID < SLocEntryLoaded.size() &&
return SLocEntryTable[ID];
const SrcMgr::SLocEntry &getSLocEntry(FileID FID) const {
return getSLocEntry(FID.ID);
unsigned getNextOffset() const { return NextOffset; }
/// \brief Preallocate some number of source location entries, which
/// will be loaded as needed from the given external source.
void PreallocateSLocEntries(ExternalSLocEntrySource *Source,
unsigned NumSLocEntries,
unsigned NextOffset);
/// \brief Clear out any preallocated source location entries that
/// haven't already been loaded.
void ClearPreallocatedSLocEntries();
/// isOffsetInFileID - Return true if the specified FileID contains the
/// specified SourceLocation offset. This is a very hot method.
inline bool isOffsetInFileID(FileID FID, unsigned SLocOffset) const {
const SrcMgr::SLocEntry &Entry = getSLocEntry(FID);
// If the entry is after the offset, it can't contain it.
if (SLocOffset < Entry.getOffset()) return false;
// If this is the last entry than it does. Otherwise, the entry after it
// has to not include it.
if (FID.ID+1 == SLocEntryTable.size()) return true;
return SLocOffset < getSLocEntry(FileID::get(FID.ID+1)).getOffset();
/// createFileID - Create a new fileID for the specified ContentCache and
/// include position. This works regardless of whether the ContentCache
/// corresponds to a file or some other input source.
FileID createFileID(const SrcMgr::ContentCache* File,
SourceLocation IncludePos,
SrcMgr::CharacteristicKind DirCharacter,
unsigned PreallocatedID = 0,
unsigned Offset = 0);
const SrcMgr::ContentCache *
getOrCreateContentCache(const FileEntry *SourceFile);
/// createMemBufferContentCache - Create a new ContentCache for the specified
/// memory buffer.
const SrcMgr::ContentCache*
createMemBufferContentCache(const llvm::MemoryBuffer *Buf);
FileID getFileIDSlow(unsigned SLocOffset) const;
SourceLocation getInstantiationLocSlowCase(SourceLocation Loc) const;
SourceLocation getSpellingLocSlowCase(SourceLocation Loc) const;
std::pair<FileID, unsigned>
getDecomposedInstantiationLocSlowCase(const SrcMgr::SLocEntry *E,
unsigned Offset) const;
std::pair<FileID, unsigned>
getDecomposedSpellingLocSlowCase(const SrcMgr::SLocEntry *E,
unsigned Offset) const;
} // end namespace clang