1 //===--- SourceManager.h - Track and cache source files ---------*- 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 SourceManager interface.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CLANG_SOURCEMANAGER_H
15 #define LLVM_CLANG_SOURCEMANAGER_H
17 #include "clang/Basic/SourceLocation.h"
18 #include "llvm/Support/Allocator.h"
19 #include "llvm/System/DataTypes.h"
20 #include "llvm/ADT/DenseMap.h"
33 class IdentifierTokenInfo;
36 /// SrcMgr - Public enums and private classes that are part of the
37 /// SourceManager implementation.
40 /// CharacteristicKind - This is used to represent whether a file or directory
41 /// holds normal user code, system code, or system code which is implicitly
42 /// 'extern "C"' in C++ mode. Entire directories can be tagged with this
43 /// (this is maintained by DirectoryLookup and friends) as can specific
44 /// FileIDInfos when a #pragma system_header is seen or various other cases.
46 enum CharacteristicKind {
47 C_User, C_System, C_ExternCSystem
50 /// ContentCache - Once instance of this struct is kept for every file
51 /// loaded or used. This object owns the MemoryBuffer object.
53 /// Buffer - The actual buffer containing the characters from the input
54 /// file. This is owned by the ContentCache object.
55 mutable const llvm::MemoryBuffer *Buffer;
57 /// The line and column at which we should truncate the file.
58 unsigned TruncateAtLine, TruncateAtColumn;
61 /// Reference to the file entry. This reference does not own
62 /// the FileEntry object. It is possible for this to be NULL if
63 /// the ContentCache encapsulates an imaginary text buffer.
64 const FileEntry *Entry;
66 /// SourceLineCache - A bump pointer allocated array of offsets for each
67 /// source line. This is lazily computed. This is owned by the
68 /// SourceManager BumpPointerAllocator object.
69 unsigned *SourceLineCache;
71 /// NumLines - The number of lines in this ContentCache. This is only valid
72 /// if SourceLineCache is non-null.
75 /// FirstFID - First FileID that was created for this ContentCache.
76 /// Represents the first source inclusion of the file associated with this
78 mutable FileID FirstFID;
80 /// getBuffer - Returns the memory buffer for the associated content.
81 const llvm::MemoryBuffer *getBuffer() const;
83 /// getSize - Returns the size of the content encapsulated by this
84 /// ContentCache. This can be the size of the source file or the size of an
85 /// arbitrary scratch buffer. If the ContentCache encapsulates a source
86 /// file this size is retrieved from the file's FileEntry.
87 unsigned getSize() const;
89 /// getSizeBytesMapped - Returns the number of bytes actually mapped for
90 /// this ContentCache. This can be 0 if the MemBuffer was not actually
92 unsigned getSizeBytesMapped() const;
94 void setBuffer(const llvm::MemoryBuffer *B) {
95 assert(!Buffer && "MemoryBuffer already set.");
99 /// \brief Truncate this file at the given line and column.
101 /// \param Line the line on which to truncate the current file (1-based).
102 /// \param Column the column at which to truncate the current file.
104 void truncateAt(unsigned Line, unsigned Column);
106 /// \brief Determines whether the file was artificially truncated with
108 bool isTruncated() const { return TruncateAtLine && TruncateAtColumn; }
110 ContentCache(const FileEntry *Ent = 0)
111 : Buffer(0), TruncateAtLine(0), TruncateAtColumn(0), Entry(Ent),
112 SourceLineCache(0), NumLines(0) {}
116 /// The copy ctor does not allow copies where source object has either
117 /// a non-NULL Buffer or SourceLineCache. Ownership of allocated memory
118 /// is not transfered, so this is a logical error.
119 ContentCache(const ContentCache &RHS)
120 : Buffer(0), TruncateAtLine(0), TruncateAtColumn(0), SourceLineCache(0) {
123 assert (RHS.Buffer == 0 && RHS.SourceLineCache == 0
124 && "Passed ContentCache object cannot own a buffer.");
126 NumLines = RHS.NumLines;
130 // Disable assignments.
131 ContentCache &operator=(const ContentCache& RHS);
134 /// FileInfo - Information about a FileID, basically just the logical file
135 /// that it represents and include stack information.
137 /// Each FileInfo has include stack information, indicating where it came
138 /// from. This information encodes the #include chain that a token was
139 /// instantiated from. The main include file has an invalid IncludeLoc.
141 /// FileInfos contain a "ContentCache *", with the contents of the file.
144 /// IncludeLoc - The location of the #include that brought in this file.
145 /// This is an invalid SLOC for the main file (top of the #include chain).
146 unsigned IncludeLoc; // Really a SourceLocation
148 /// Data - This contains the ContentCache* and the bits indicating the
149 /// characteristic of the file and whether it has #line info, all bitmangled
153 /// get - Return a FileInfo object.
154 static FileInfo get(SourceLocation IL, const ContentCache *Con,
155 CharacteristicKind FileCharacter) {
157 X.IncludeLoc = IL.getRawEncoding();
158 X.Data = (uintptr_t)Con;
159 assert((X.Data & 7) == 0 &&"ContentCache pointer insufficiently aligned");
160 assert((unsigned)FileCharacter < 4 && "invalid file character");
161 X.Data |= (unsigned)FileCharacter;
165 SourceLocation getIncludeLoc() const {
166 return SourceLocation::getFromRawEncoding(IncludeLoc);
168 const ContentCache* getContentCache() const {
169 return reinterpret_cast<const ContentCache*>(Data & ~7UL);
172 /// getCharacteristic - Return whether this is a system header or not.
173 CharacteristicKind getFileCharacteristic() const {
174 return (CharacteristicKind)(Data & 3);
177 /// hasLineDirectives - Return true if this FileID has #line directives in
179 bool hasLineDirectives() const { return (Data & 4) != 0; }
181 /// setHasLineDirectives - Set the flag that indicates that this FileID has
182 /// line table entries associated with it.
183 void setHasLineDirectives() {
188 /// InstantiationInfo - Each InstantiationInfo encodes the Instantiation
189 /// location - where the token was ultimately instantiated, and the
190 /// SpellingLoc - where the actual character data for the token came from.
191 class InstantiationInfo {
192 // Really these are all SourceLocations.
194 /// SpellingLoc - Where the spelling for the token can be found.
195 unsigned SpellingLoc;
197 /// InstantiationLocStart/InstantiationLocEnd - In a macro expansion, these
198 /// indicate the start and end of the instantiation. In object-like macros,
199 /// these will be the same. In a function-like macro instantiation, the
200 /// start will be the identifier and the end will be the ')'.
201 unsigned InstantiationLocStart, InstantiationLocEnd;
203 SourceLocation getSpellingLoc() const {
204 return SourceLocation::getFromRawEncoding(SpellingLoc);
206 SourceLocation getInstantiationLocStart() const {
207 return SourceLocation::getFromRawEncoding(InstantiationLocStart);
209 SourceLocation getInstantiationLocEnd() const {
210 return SourceLocation::getFromRawEncoding(InstantiationLocEnd);
213 std::pair<SourceLocation,SourceLocation> getInstantiationLocRange() const {
214 return std::make_pair(getInstantiationLocStart(),
215 getInstantiationLocEnd());
218 /// get - Return a InstantiationInfo for an expansion. IL specifies
219 /// the instantiation location (where the macro is expanded), and SL
220 /// specifies the spelling location (where the characters from the token
221 /// come from). IL and PL can both refer to normal File SLocs or
222 /// instantiation locations.
223 static InstantiationInfo get(SourceLocation ILStart, SourceLocation ILEnd,
226 X.SpellingLoc = SL.getRawEncoding();
227 X.InstantiationLocStart = ILStart.getRawEncoding();
228 X.InstantiationLocEnd = ILEnd.getRawEncoding();
233 /// SLocEntry - This is a discriminated union of FileInfo and
234 /// InstantiationInfo. SourceManager keeps an array of these objects, and
235 /// they are uniquely identified by the FileID datatype.
237 unsigned Offset; // low bit is set for instantiation info.
240 InstantiationInfo Instantiation;
243 unsigned getOffset() const { return Offset >> 1; }
245 bool isInstantiation() const { return Offset & 1; }
246 bool isFile() const { return !isInstantiation(); }
248 const FileInfo &getFile() const {
249 assert(isFile() && "Not a file SLocEntry!");
253 const InstantiationInfo &getInstantiation() const {
254 assert(isInstantiation() && "Not an instantiation SLocEntry!");
255 return Instantiation;
258 static SLocEntry get(unsigned Offset, const FileInfo &FI) {
260 E.Offset = Offset << 1;
265 static SLocEntry get(unsigned Offset, const InstantiationInfo &II) {
267 E.Offset = (Offset << 1) | 1;
268 E.Instantiation = II;
272 } // end SrcMgr namespace.
274 /// \brief External source of source location entries.
275 class ExternalSLocEntrySource {
277 virtual ~ExternalSLocEntrySource();
279 /// \brief Read the source location entry with index ID.
280 virtual void ReadSLocEntry(unsigned ID) = 0;
283 /// SourceManager - This file handles loading and caching of source files into
284 /// memory. This object owns the MemoryBuffer objects for all of the loaded
285 /// files and assigns unique FileID's for each unique #include chain.
287 /// The SourceManager can be queried for information about SourceLocation
288 /// objects, turning them into either spelling or instantiation locations.
289 /// Spelling locations represent where the bytes corresponding to a token came
290 /// from and instantiation locations represent where the location is in the
291 /// user's view. In the case of a macro expansion, for example, the spelling
292 /// location indicates where the expanded token came from and the instantiation
293 /// location specifies where it was expanded.
294 class SourceManager {
295 mutable llvm::BumpPtrAllocator ContentCacheAlloc;
297 /// FileInfos - Memoized information about all of the files tracked by this
298 /// SourceManager. This set allows us to merge ContentCache entries based
299 /// on their FileEntry*. All ContentCache objects will thus have unique,
300 /// non-null, FileEntry pointers.
301 llvm::DenseMap<const FileEntry*, SrcMgr::ContentCache*> FileInfos;
303 /// MemBufferInfos - Information about various memory buffers that we have
304 /// read in. All FileEntry* within the stored ContentCache objects are NULL,
305 /// as they do not refer to a file.
306 std::vector<SrcMgr::ContentCache*> MemBufferInfos;
308 /// SLocEntryTable - This is an array of SLocEntry's that we have created.
309 /// FileID is an index into this vector. This array is sorted by the offset.
310 std::vector<SrcMgr::SLocEntry> SLocEntryTable;
311 /// NextOffset - This is the next available offset that a new SLocEntry can
312 /// start at. It is SLocEntryTable.back().getOffset()+size of back() entry.
315 /// \brief If source location entries are being lazily loaded from
316 /// an external source, this vector indicates whether the Ith source
317 /// location entry has already been loaded from the external storage.
318 std::vector<bool> SLocEntryLoaded;
320 /// \brief An external source for source location entries.
321 ExternalSLocEntrySource *ExternalSLocEntries;
323 /// LastFileIDLookup - This is a one-entry cache to speed up getFileID.
324 /// LastFileIDLookup records the last FileID looked up or created, because it
325 /// is very common to look up many tokens from the same file.
326 mutable FileID LastFileIDLookup;
328 /// LineTable - This holds information for #line directives. It is referenced
329 /// by indices from SLocEntryTable.
330 LineTableInfo *LineTable;
332 /// LastLineNo - These ivars serve as a cache used in the getLineNumber
333 /// method which is used to speedup getLineNumber calls to nearby locations.
334 mutable FileID LastLineNoFileIDQuery;
335 mutable SrcMgr::ContentCache *LastLineNoContentCache;
336 mutable unsigned LastLineNoFilePos;
337 mutable unsigned LastLineNoResult;
339 /// MainFileID - The file ID for the main source file of the translation unit.
342 // Statistics for -print-stats.
343 mutable unsigned NumLinearScans, NumBinaryProbes;
345 // Cache results for the isBeforeInTranslationUnit method.
346 mutable FileID LastLFIDForBeforeTUCheck;
347 mutable FileID LastRFIDForBeforeTUCheck;
348 mutable bool LastResForBeforeTUCheck;
350 // Keep track of the file/line/column that we should truncate.
351 const FileEntry *TruncateFile;
352 unsigned TruncateAtLine;
353 unsigned TruncateAtColumn;
355 // SourceManager doesn't support copy construction.
356 explicit SourceManager(const SourceManager&);
357 void operator=(const SourceManager&);
360 : ExternalSLocEntries(0), LineTable(0), NumLinearScans(0),
361 NumBinaryProbes(0), TruncateFile(0), TruncateAtLine(0),
362 TruncateAtColumn(0) {
367 void clearIDTables();
369 //===--------------------------------------------------------------------===//
370 // MainFileID creation and querying methods.
371 //===--------------------------------------------------------------------===//
373 /// getMainFileID - Returns the FileID of the main source file.
374 FileID getMainFileID() const { return MainFileID; }
376 /// createMainFileID - Create the FileID for the main source file.
377 FileID createMainFileID(const FileEntry *SourceFile,
378 SourceLocation IncludePos) {
379 assert(MainFileID.isInvalid() && "MainFileID already set!");
380 MainFileID = createFileID(SourceFile, IncludePos, SrcMgr::C_User);
384 //===--------------------------------------------------------------------===//
385 // Methods to create new FileID's and instantiations.
386 //===--------------------------------------------------------------------===//
388 /// createFileID - Create a new FileID that represents the specified file
389 /// being #included from the specified IncludePosition. This returns 0 on
390 /// error and translates NULL into standard input.
391 /// PreallocateID should be non-zero to specify which a pre-allocated,
392 /// lazily computed source location is being filled in by this operation.
393 FileID createFileID(const FileEntry *SourceFile, SourceLocation IncludePos,
394 SrcMgr::CharacteristicKind FileCharacter,
395 unsigned PreallocatedID = 0,
396 unsigned Offset = 0) {
397 const SrcMgr::ContentCache *IR = getOrCreateContentCache(SourceFile);
398 if (IR == 0) return FileID(); // Error opening file?
399 return createFileID(IR, IncludePos, FileCharacter, PreallocatedID, Offset);
402 /// createFileIDForMemBuffer - Create a new FileID that represents the
403 /// specified memory buffer. This does no caching of the buffer and takes
404 /// ownership of the MemoryBuffer, so only pass a MemoryBuffer to this once.
405 FileID createFileIDForMemBuffer(const llvm::MemoryBuffer *Buffer,
406 unsigned PreallocatedID = 0,
407 unsigned Offset = 0) {
408 return createFileID(createMemBufferContentCache(Buffer), SourceLocation(),
409 SrcMgr::C_User, PreallocatedID, Offset);
412 /// createMainFileIDForMembuffer - Create the FileID for a memory buffer
413 /// that will represent the FileID for the main source. One example
414 /// of when this would be used is when the main source is read from STDIN.
415 FileID createMainFileIDForMemBuffer(const llvm::MemoryBuffer *Buffer) {
416 assert(MainFileID.isInvalid() && "MainFileID already set!");
417 MainFileID = createFileIDForMemBuffer(Buffer);
421 /// createInstantiationLoc - Return a new SourceLocation that encodes the fact
422 /// that a token at Loc should actually be referenced from InstantiationLoc.
423 /// TokLength is the length of the token being instantiated.
424 SourceLocation createInstantiationLoc(SourceLocation Loc,
425 SourceLocation InstantiationLocStart,
426 SourceLocation InstantiationLocEnd,
428 unsigned PreallocatedID = 0,
429 unsigned Offset = 0);
431 //===--------------------------------------------------------------------===//
432 // FileID manipulation methods.
433 //===--------------------------------------------------------------------===//
435 /// getBuffer - Return the buffer for the specified FileID.
437 const llvm::MemoryBuffer *getBuffer(FileID FID) const {
438 return getSLocEntry(FID).getFile().getContentCache()->getBuffer();
441 /// getFileEntryForID - Returns the FileEntry record for the provided FileID.
442 const FileEntry *getFileEntryForID(FileID FID) const {
443 return getSLocEntry(FID).getFile().getContentCache()->Entry;
446 /// getBufferData - Return a pointer to the start and end of the source buffer
447 /// data for the specified FileID.
448 std::pair<const char*, const char*> getBufferData(FileID FID) const;
451 //===--------------------------------------------------------------------===//
452 // SourceLocation manipulation methods.
453 //===--------------------------------------------------------------------===//
455 /// getFileID - Return the FileID for a SourceLocation. This is a very
456 /// hot method that is used for all SourceManager queries that start with a
457 /// SourceLocation object. It is responsible for finding the entry in
458 /// SLocEntryTable which contains the specified location.
460 FileID getFileID(SourceLocation SpellingLoc) const {
461 unsigned SLocOffset = SpellingLoc.getOffset();
463 // If our one-entry cache covers this offset, just return it.
464 if (isOffsetInFileID(LastFileIDLookup, SLocOffset))
465 return LastFileIDLookup;
467 return getFileIDSlow(SLocOffset);
470 /// getLocForStartOfFile - Return the source location corresponding to the
471 /// first byte of the specified file.
472 SourceLocation getLocForStartOfFile(FileID FID) const {
473 assert(FID.ID < SLocEntryTable.size() && "FileID out of range");
474 assert(getSLocEntry(FID).isFile() && "FileID is not a file");
475 unsigned FileOffset = getSLocEntry(FID).getOffset();
476 return SourceLocation::getFileLoc(FileOffset);
479 /// getInstantiationLoc - Given a SourceLocation object, return the
480 /// instantiation location referenced by the ID.
481 SourceLocation getInstantiationLoc(SourceLocation Loc) const {
482 // Handle the non-mapped case inline, defer to out of line code to handle
484 if (Loc.isFileID()) return Loc;
485 return getInstantiationLocSlowCase(Loc);
488 /// getImmediateInstantiationRange - Loc is required to be an instantiation
489 /// location. Return the start/end of the instantiation information.
490 std::pair<SourceLocation,SourceLocation>
491 getImmediateInstantiationRange(SourceLocation Loc) const;
493 /// getInstantiationRange - Given a SourceLocation object, return the
494 /// range of tokens covered by the instantiation in the ultimate file.
495 std::pair<SourceLocation,SourceLocation>
496 getInstantiationRange(SourceLocation Loc) const;
499 /// getSpellingLoc - Given a SourceLocation object, return the spelling
500 /// location referenced by the ID. This is the place where the characters
501 /// that make up the lexed token can be found.
502 SourceLocation getSpellingLoc(SourceLocation Loc) const {
503 // Handle the non-mapped case inline, defer to out of line code to handle
505 if (Loc.isFileID()) return Loc;
506 return getSpellingLocSlowCase(Loc);
509 /// getImmediateSpellingLoc - Given a SourceLocation object, return the
510 /// spelling location referenced by the ID. This is the first level down
511 /// towards the place where the characters that make up the lexed token can be
512 /// found. This should not generally be used by clients.
513 SourceLocation getImmediateSpellingLoc(SourceLocation Loc) const;
515 /// getDecomposedLoc - Decompose the specified location into a raw FileID +
516 /// Offset pair. The first element is the FileID, the second is the
517 /// offset from the start of the buffer of the location.
518 std::pair<FileID, unsigned> getDecomposedLoc(SourceLocation Loc) const {
519 FileID FID = getFileID(Loc);
520 return std::make_pair(FID, Loc.getOffset()-getSLocEntry(FID).getOffset());
523 /// getDecomposedInstantiationLoc - Decompose the specified location into a
524 /// raw FileID + Offset pair. If the location is an instantiation record,
525 /// walk through it until we find the final location instantiated.
526 std::pair<FileID, unsigned>
527 getDecomposedInstantiationLoc(SourceLocation Loc) const {
528 FileID FID = getFileID(Loc);
529 const SrcMgr::SLocEntry *E = &getSLocEntry(FID);
531 unsigned Offset = Loc.getOffset()-E->getOffset();
533 return std::make_pair(FID, Offset);
535 return getDecomposedInstantiationLocSlowCase(E, Offset);
538 /// getDecomposedSpellingLoc - Decompose the specified location into a raw
539 /// FileID + Offset pair. If the location is an instantiation record, walk
540 /// through it until we find its spelling record.
541 std::pair<FileID, unsigned>
542 getDecomposedSpellingLoc(SourceLocation Loc) const {
543 FileID FID = getFileID(Loc);
544 const SrcMgr::SLocEntry *E = &getSLocEntry(FID);
546 unsigned Offset = Loc.getOffset()-E->getOffset();
548 return std::make_pair(FID, Offset);
549 return getDecomposedSpellingLocSlowCase(E, Offset);
552 /// getFileOffset - This method returns the offset from the start
553 /// of the file that the specified SourceLocation represents. This is not very
554 /// meaningful for a macro ID.
555 unsigned getFileOffset(SourceLocation SpellingLoc) const {
556 return getDecomposedLoc(SpellingLoc).second;
560 //===--------------------------------------------------------------------===//
561 // Queries about the code at a SourceLocation.
562 //===--------------------------------------------------------------------===//
564 /// getCharacterData - Return a pointer to the start of the specified location
565 /// in the appropriate spelling MemoryBuffer.
566 const char *getCharacterData(SourceLocation SL) const;
568 /// getColumnNumber - Return the column # for the specified file position.
569 /// This is significantly cheaper to compute than the line number. This
570 /// returns zero if the column number isn't known. This may only be called on
571 /// a file sloc, so you must choose a spelling or instantiation location
572 /// before calling this method.
573 unsigned getColumnNumber(FileID FID, unsigned FilePos) const;
574 unsigned getSpellingColumnNumber(SourceLocation Loc) const;
575 unsigned getInstantiationColumnNumber(SourceLocation Loc) const;
578 /// getLineNumber - Given a SourceLocation, return the spelling line number
579 /// for the position indicated. This requires building and caching a table of
580 /// line offsets for the MemoryBuffer, so this is not cheap: use only when
581 /// about to emit a diagnostic.
582 unsigned getLineNumber(FileID FID, unsigned FilePos) const;
584 unsigned getInstantiationLineNumber(SourceLocation Loc) const;
585 unsigned getSpellingLineNumber(SourceLocation Loc) const;
587 /// Return the filename or buffer identifier of the buffer the location is in.
588 /// Note that this name does not respect #line directives. Use getPresumedLoc
589 /// for normal clients.
590 const char *getBufferName(SourceLocation Loc) const;
592 /// getFileCharacteristic - return the file characteristic of the specified
593 /// source location, indicating whether this is a normal file, a system
594 /// header, or an "implicit extern C" system header.
596 /// This state can be modified with flags on GNU linemarker directives like:
598 /// which changes all source locations in the current file after that to be
599 /// considered to be from a system header.
600 SrcMgr::CharacteristicKind getFileCharacteristic(SourceLocation Loc) const;
602 /// getPresumedLoc - This method returns the "presumed" location of a
603 /// SourceLocation specifies. A "presumed location" can be modified by #line
604 /// or GNU line marker directives. This provides a view on the data that a
605 /// user should see in diagnostics, for example.
607 /// Note that a presumed location is always given as the instantiation point
608 /// of an instantiation location, not at the spelling location.
609 PresumedLoc getPresumedLoc(SourceLocation Loc) const;
611 /// isFromSameFile - Returns true if both SourceLocations correspond to
613 bool isFromSameFile(SourceLocation Loc1, SourceLocation Loc2) const {
614 return getFileID(Loc1) == getFileID(Loc2);
617 /// isFromMainFile - Returns true if the file of provided SourceLocation is
619 bool isFromMainFile(SourceLocation Loc) const {
620 return getFileID(Loc) == getMainFileID();
623 /// isInSystemHeader - Returns if a SourceLocation is in a system header.
624 bool isInSystemHeader(SourceLocation Loc) const {
625 return getFileCharacteristic(Loc) != SrcMgr::C_User;
628 /// isInExternCSystemHeader - Returns if a SourceLocation is in an "extern C"
630 bool isInExternCSystemHeader(SourceLocation Loc) const {
631 return getFileCharacteristic(Loc) == SrcMgr::C_ExternCSystem;
634 //===--------------------------------------------------------------------===//
635 // Line Table Manipulation Routines
636 //===--------------------------------------------------------------------===//
638 /// getLineTableFilenameID - Return the uniqued ID for the specified filename.
640 unsigned getLineTableFilenameID(const char *Ptr, unsigned Len);
642 /// AddLineNote - Add a line note to the line table for the FileID and offset
643 /// specified by Loc. If FilenameID is -1, it is considered to be
645 void AddLineNote(SourceLocation Loc, unsigned LineNo, int FilenameID);
646 void AddLineNote(SourceLocation Loc, unsigned LineNo, int FilenameID,
647 bool IsFileEntry, bool IsFileExit,
648 bool IsSystemHeader, bool IsExternCHeader);
650 /// \brief Determine if the source manager has a line table.
651 bool hasLineTable() const { return LineTable != 0; }
653 /// \brief Retrieve the stored line table.
654 LineTableInfo &getLineTable();
656 //===--------------------------------------------------------------------===//
657 // Other miscellaneous methods.
658 //===--------------------------------------------------------------------===//
660 /// \brief Get the source location for the given file:line:col triplet.
662 /// If the source file is included multiple times, the source location will
663 /// be based upon the first inclusion.
664 SourceLocation getLocation(const FileEntry *SourceFile,
665 unsigned Line, unsigned Col) const;
667 /// \brief Determines the order of 2 source locations in the translation unit.
669 /// \returns true if LHS source location comes before RHS, false otherwise.
670 bool isBeforeInTranslationUnit(SourceLocation LHS, SourceLocation RHS) const;
672 /// \brief Truncate the given file at the specified line/column.
673 void truncateFileAt(const FileEntry *Entry, unsigned Line, unsigned Column);
675 /// \brief Determine whether this file was truncated.
676 bool isTruncatedFile(FileID FID) const;
678 // Iterators over FileInfos.
679 typedef llvm::DenseMap<const FileEntry*, SrcMgr::ContentCache*>
680 ::const_iterator fileinfo_iterator;
681 fileinfo_iterator fileinfo_begin() const { return FileInfos.begin(); }
682 fileinfo_iterator fileinfo_end() const { return FileInfos.end(); }
684 /// PrintStats - Print statistics to stderr.
686 void PrintStats() const;
688 unsigned sloc_entry_size() const { return SLocEntryTable.size(); }
690 const SrcMgr::SLocEntry &getSLocEntry(unsigned ID) const {
691 assert(ID < SLocEntryTable.size() && "Invalid id");
692 if (ExternalSLocEntries &&
693 ID < SLocEntryLoaded.size() &&
694 !SLocEntryLoaded[ID])
695 ExternalSLocEntries->ReadSLocEntry(ID);
696 return SLocEntryTable[ID];
699 const SrcMgr::SLocEntry &getSLocEntry(FileID FID) const {
700 return getSLocEntry(FID.ID);
703 unsigned getNextOffset() const { return NextOffset; }
705 /// \brief Preallocate some number of source location entries, which
706 /// will be loaded as needed from the given external source.
707 void PreallocateSLocEntries(ExternalSLocEntrySource *Source,
708 unsigned NumSLocEntries,
709 unsigned NextOffset);
711 /// \brief Clear out any preallocated source location entries that
712 /// haven't already been loaded.
713 void ClearPreallocatedSLocEntries();
716 /// isOffsetInFileID - Return true if the specified FileID contains the
717 /// specified SourceLocation offset. This is a very hot method.
718 inline bool isOffsetInFileID(FileID FID, unsigned SLocOffset) const {
719 const SrcMgr::SLocEntry &Entry = getSLocEntry(FID);
720 // If the entry is after the offset, it can't contain it.
721 if (SLocOffset < Entry.getOffset()) return false;
723 // If this is the last entry than it does. Otherwise, the entry after it
724 // has to not include it.
725 if (FID.ID+1 == SLocEntryTable.size()) return true;
727 return SLocOffset < getSLocEntry(FileID::get(FID.ID+1)).getOffset();
730 /// createFileID - Create a new fileID for the specified ContentCache and
731 /// include position. This works regardless of whether the ContentCache
732 /// corresponds to a file or some other input source.
733 FileID createFileID(const SrcMgr::ContentCache* File,
734 SourceLocation IncludePos,
735 SrcMgr::CharacteristicKind DirCharacter,
736 unsigned PreallocatedID = 0,
737 unsigned Offset = 0);
739 const SrcMgr::ContentCache *
740 getOrCreateContentCache(const FileEntry *SourceFile);
742 /// createMemBufferContentCache - Create a new ContentCache for the specified
744 const SrcMgr::ContentCache*
745 createMemBufferContentCache(const llvm::MemoryBuffer *Buf);
747 FileID getFileIDSlow(unsigned SLocOffset) const;
749 SourceLocation getInstantiationLocSlowCase(SourceLocation Loc) const;
750 SourceLocation getSpellingLocSlowCase(SourceLocation Loc) const;
752 std::pair<FileID, unsigned>
753 getDecomposedInstantiationLocSlowCase(const SrcMgr::SLocEntry *E,
754 unsigned Offset) const;
755 std::pair<FileID, unsigned>
756 getDecomposedSpellingLocSlowCase(const SrcMgr::SLocEntry *E,
757 unsigned Offset) const;
761 } // end namespace clang