SourceManager.h revision 36c35ba0aca641e60e5dbee8efbc620c08b9bd61
1//===--- SourceManager.h - Track and cache source files ---------*- 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 file defines the SourceManager interface. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_SOURCEMANAGER_H 15#define LLVM_CLANG_SOURCEMANAGER_H 16 17#include "clang/Basic/SourceLocation.h" 18#include "llvm/Support/Allocator.h" 19#include "llvm/System/DataTypes.h" 20#include "llvm/ADT/PointerUnion.h" 21#include "llvm/ADT/DenseMap.h" 22#include <vector> 23#include <cassert> 24 25namespace llvm { 26class MemoryBuffer; 27class StringRef; 28} 29 30namespace clang { 31 32class Diagnostic; 33class SourceManager; 34class FileManager; 35class FileEntry; 36class LineTableInfo; 37 38/// SrcMgr - Public enums and private classes that are part of the 39/// SourceManager implementation. 40/// 41namespace SrcMgr { 42 /// CharacteristicKind - This is used to represent whether a file or directory 43 /// holds normal user code, system code, or system code which is implicitly 44 /// 'extern "C"' in C++ mode. Entire directories can be tagged with this 45 /// (this is maintained by DirectoryLookup and friends) as can specific 46 /// FileIDInfos when a #pragma system_header is seen or various other cases. 47 /// 48 enum CharacteristicKind { 49 C_User, C_System, C_ExternCSystem 50 }; 51 52 /// ContentCache - Once instance of this struct is kept for every file 53 /// loaded or used. This object owns the MemoryBuffer object. 54 class ContentCache { 55 /// Buffer - The actual buffer containing the characters from the input 56 /// file. This is owned by the ContentCache object. 57 mutable const llvm::MemoryBuffer *Buffer; 58 59 public: 60 /// Reference to the file entry. This reference does not own 61 /// the FileEntry object. It is possible for this to be NULL if 62 /// the ContentCache encapsulates an imaginary text buffer. 63 const FileEntry *Entry; 64 65 /// SourceLineCache - A bump pointer allocated array of offsets for each 66 /// source line. This is lazily computed. This is owned by the 67 /// SourceManager BumpPointerAllocator object. 68 unsigned *SourceLineCache; 69 70 /// NumLines - The number of lines in this ContentCache. This is only valid 71 /// if SourceLineCache is non-null. 72 unsigned NumLines; 73 74 /// getBuffer - Returns the memory buffer for the associated content. 75 /// 76 /// \param Diag Object through which diagnostics will be emitted it the 77 /// buffer cannot be retrieved. 78 /// 79 /// \param Invalid If non-NULL, will be set \c true if an error occurred. 80 const llvm::MemoryBuffer *getBuffer(Diagnostic &Diag, 81 bool *Invalid = 0) const; 82 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; 88 89 /// getSizeBytesMapped - Returns the number of bytes actually mapped for 90 /// this ContentCache. This can be 0 if the MemBuffer was not actually 91 /// instantiated. 92 unsigned getSizeBytesMapped() const; 93 94 void setBuffer(const llvm::MemoryBuffer *B) { 95 assert(!Buffer && "MemoryBuffer already set."); 96 Buffer = B; 97 } 98 99 /// \brief Replace the existing buffer (which will be deleted) 100 /// with the given buffer. 101 void replaceBuffer(const llvm::MemoryBuffer *B); 102 103 ContentCache(const FileEntry *Ent = 0) 104 : Buffer(0), Entry(Ent), SourceLineCache(0), NumLines(0) {} 105 106 ~ContentCache(); 107 108 /// The copy ctor does not allow copies where source object has either 109 /// a non-NULL Buffer or SourceLineCache. Ownership of allocated memory 110 /// is not transfered, so this is a logical error. 111 ContentCache(const ContentCache &RHS) : Buffer(0), SourceLineCache(0) { 112 Entry = RHS.Entry; 113 114 assert (RHS.Buffer == 0 && RHS.SourceLineCache == 0 115 && "Passed ContentCache object cannot own a buffer."); 116 117 NumLines = RHS.NumLines; 118 } 119 120 private: 121 // Disable assignments. 122 ContentCache &operator=(const ContentCache& RHS); 123 }; 124 125 /// FileInfo - Information about a FileID, basically just the logical file 126 /// that it represents and include stack information. 127 /// 128 /// Each FileInfo has include stack information, indicating where it came 129 /// from. This information encodes the #include chain that a token was 130 /// instantiated from. The main include file has an invalid IncludeLoc. 131 /// 132 /// FileInfos contain a "ContentCache *", with the contents of the file. 133 /// 134 class FileInfo { 135 /// IncludeLoc - The location of the #include that brought in this file. 136 /// This is an invalid SLOC for the main file (top of the #include chain). 137 unsigned IncludeLoc; // Really a SourceLocation 138 139 /// Data - This contains the ContentCache* and the bits indicating the 140 /// characteristic of the file and whether it has #line info, all bitmangled 141 /// together. 142 uintptr_t Data; 143 public: 144 /// get - Return a FileInfo object. 145 static FileInfo get(SourceLocation IL, const ContentCache *Con, 146 CharacteristicKind FileCharacter) { 147 FileInfo X; 148 X.IncludeLoc = IL.getRawEncoding(); 149 X.Data = (uintptr_t)Con; 150 assert((X.Data & 7) == 0 &&"ContentCache pointer insufficiently aligned"); 151 assert((unsigned)FileCharacter < 4 && "invalid file character"); 152 X.Data |= (unsigned)FileCharacter; 153 return X; 154 } 155 156 SourceLocation getIncludeLoc() const { 157 return SourceLocation::getFromRawEncoding(IncludeLoc); 158 } 159 const ContentCache* getContentCache() const { 160 return reinterpret_cast<const ContentCache*>(Data & ~7UL); 161 } 162 163 /// getCharacteristic - Return whether this is a system header or not. 164 CharacteristicKind getFileCharacteristic() const { 165 return (CharacteristicKind)(Data & 3); 166 } 167 168 /// hasLineDirectives - Return true if this FileID has #line directives in 169 /// it. 170 bool hasLineDirectives() const { return (Data & 4) != 0; } 171 172 /// setHasLineDirectives - Set the flag that indicates that this FileID has 173 /// line table entries associated with it. 174 void setHasLineDirectives() { 175 Data |= 4; 176 } 177 }; 178 179 /// InstantiationInfo - Each InstantiationInfo encodes the Instantiation 180 /// location - where the token was ultimately instantiated, and the 181 /// SpellingLoc - where the actual character data for the token came from. 182 class InstantiationInfo { 183 // Really these are all SourceLocations. 184 185 /// SpellingLoc - Where the spelling for the token can be found. 186 unsigned SpellingLoc; 187 188 /// InstantiationLocStart/InstantiationLocEnd - In a macro expansion, these 189 /// indicate the start and end of the instantiation. In object-like macros, 190 /// these will be the same. In a function-like macro instantiation, the 191 /// start will be the identifier and the end will be the ')'. 192 unsigned InstantiationLocStart, InstantiationLocEnd; 193 public: 194 SourceLocation getSpellingLoc() const { 195 return SourceLocation::getFromRawEncoding(SpellingLoc); 196 } 197 SourceLocation getInstantiationLocStart() const { 198 return SourceLocation::getFromRawEncoding(InstantiationLocStart); 199 } 200 SourceLocation getInstantiationLocEnd() const { 201 return SourceLocation::getFromRawEncoding(InstantiationLocEnd); 202 } 203 204 std::pair<SourceLocation,SourceLocation> getInstantiationLocRange() const { 205 return std::make_pair(getInstantiationLocStart(), 206 getInstantiationLocEnd()); 207 } 208 209 /// get - Return a InstantiationInfo for an expansion. IL specifies 210 /// the instantiation location (where the macro is expanded), and SL 211 /// specifies the spelling location (where the characters from the token 212 /// come from). IL and PL can both refer to normal File SLocs or 213 /// instantiation locations. 214 static InstantiationInfo get(SourceLocation ILStart, SourceLocation ILEnd, 215 SourceLocation SL) { 216 InstantiationInfo X; 217 X.SpellingLoc = SL.getRawEncoding(); 218 X.InstantiationLocStart = ILStart.getRawEncoding(); 219 X.InstantiationLocEnd = ILEnd.getRawEncoding(); 220 return X; 221 } 222 }; 223 224 /// SLocEntry - This is a discriminated union of FileInfo and 225 /// InstantiationInfo. SourceManager keeps an array of these objects, and 226 /// they are uniquely identified by the FileID datatype. 227 class SLocEntry { 228 unsigned Offset; // low bit is set for instantiation info. 229 union { 230 FileInfo File; 231 InstantiationInfo Instantiation; 232 }; 233 public: 234 unsigned getOffset() const { return Offset >> 1; } 235 236 bool isInstantiation() const { return Offset & 1; } 237 bool isFile() const { return !isInstantiation(); } 238 239 const FileInfo &getFile() const { 240 assert(isFile() && "Not a file SLocEntry!"); 241 return File; 242 } 243 244 const InstantiationInfo &getInstantiation() const { 245 assert(isInstantiation() && "Not an instantiation SLocEntry!"); 246 return Instantiation; 247 } 248 249 static SLocEntry get(unsigned Offset, const FileInfo &FI) { 250 SLocEntry E; 251 E.Offset = Offset << 1; 252 E.File = FI; 253 return E; 254 } 255 256 static SLocEntry get(unsigned Offset, const InstantiationInfo &II) { 257 SLocEntry E; 258 E.Offset = (Offset << 1) | 1; 259 E.Instantiation = II; 260 return E; 261 } 262 }; 263} // end SrcMgr namespace. 264 265/// \brief External source of source location entries. 266class ExternalSLocEntrySource { 267public: 268 virtual ~ExternalSLocEntrySource(); 269 270 /// \brief Read the source location entry with index ID. 271 virtual void ReadSLocEntry(unsigned ID) = 0; 272}; 273 274/// SourceManager - This file handles loading and caching of source files into 275/// memory. This object owns the MemoryBuffer objects for all of the loaded 276/// files and assigns unique FileID's for each unique #include chain. 277/// 278/// The SourceManager can be queried for information about SourceLocation 279/// objects, turning them into either spelling or instantiation locations. 280/// Spelling locations represent where the bytes corresponding to a token came 281/// from and instantiation locations represent where the location is in the 282/// user's view. In the case of a macro expansion, for example, the spelling 283/// location indicates where the expanded token came from and the instantiation 284/// location specifies where it was expanded. 285class SourceManager { 286 /// \brief Diagnostic object. 287 Diagnostic &Diag; 288 289 mutable llvm::BumpPtrAllocator ContentCacheAlloc; 290 291 /// FileInfos - Memoized information about all of the files tracked by this 292 /// SourceManager. This set allows us to merge ContentCache entries based 293 /// on their FileEntry*. All ContentCache objects will thus have unique, 294 /// non-null, FileEntry pointers. 295 llvm::DenseMap<const FileEntry*, SrcMgr::ContentCache*> FileInfos; 296 297 /// MemBufferInfos - Information about various memory buffers that we have 298 /// read in. All FileEntry* within the stored ContentCache objects are NULL, 299 /// as they do not refer to a file. 300 std::vector<SrcMgr::ContentCache*> MemBufferInfos; 301 302 /// SLocEntryTable - This is an array of SLocEntry's that we have created. 303 /// FileID is an index into this vector. This array is sorted by the offset. 304 std::vector<SrcMgr::SLocEntry> SLocEntryTable; 305 /// NextOffset - This is the next available offset that a new SLocEntry can 306 /// start at. It is SLocEntryTable.back().getOffset()+size of back() entry. 307 unsigned NextOffset; 308 309 /// \brief If source location entries are being lazily loaded from 310 /// an external source, this vector indicates whether the Ith source 311 /// location entry has already been loaded from the external storage. 312 std::vector<bool> SLocEntryLoaded; 313 314 /// \brief An external source for source location entries. 315 ExternalSLocEntrySource *ExternalSLocEntries; 316 317 /// LastFileIDLookup - This is a one-entry cache to speed up getFileID. 318 /// LastFileIDLookup records the last FileID looked up or created, because it 319 /// is very common to look up many tokens from the same file. 320 mutable FileID LastFileIDLookup; 321 322 /// LineTable - This holds information for #line directives. It is referenced 323 /// by indices from SLocEntryTable. 324 LineTableInfo *LineTable; 325 326 /// LastLineNo - These ivars serve as a cache used in the getLineNumber 327 /// method which is used to speedup getLineNumber calls to nearby locations. 328 mutable FileID LastLineNoFileIDQuery; 329 mutable SrcMgr::ContentCache *LastLineNoContentCache; 330 mutable unsigned LastLineNoFilePos; 331 mutable unsigned LastLineNoResult; 332 333 /// MainFileID - The file ID for the main source file of the translation unit. 334 FileID MainFileID; 335 336 // Statistics for -print-stats. 337 mutable unsigned NumLinearScans, NumBinaryProbes; 338 339 // Cache results for the isBeforeInTranslationUnit method. 340 mutable FileID LastLFIDForBeforeTUCheck; 341 mutable FileID LastRFIDForBeforeTUCheck; 342 mutable bool LastResForBeforeTUCheck; 343 344 // SourceManager doesn't support copy construction. 345 explicit SourceManager(const SourceManager&); 346 void operator=(const SourceManager&); 347public: 348 SourceManager(Diagnostic &Diag) 349 : Diag(Diag), ExternalSLocEntries(0), LineTable(0), NumLinearScans(0), 350 NumBinaryProbes(0) { 351 clearIDTables(); 352 } 353 ~SourceManager(); 354 355 void clearIDTables(); 356 357 //===--------------------------------------------------------------------===// 358 // MainFileID creation and querying methods. 359 //===--------------------------------------------------------------------===// 360 361 /// getMainFileID - Returns the FileID of the main source file. 362 FileID getMainFileID() const { return MainFileID; } 363 364 /// createMainFileID - Create the FileID for the main source file. 365 FileID createMainFileID(const FileEntry *SourceFile, 366 SourceLocation IncludePos) { 367 assert(MainFileID.isInvalid() && "MainFileID already set!"); 368 MainFileID = createFileID(SourceFile, IncludePos, SrcMgr::C_User); 369 return MainFileID; 370 } 371 372 //===--------------------------------------------------------------------===// 373 // Methods to create new FileID's and instantiations. 374 //===--------------------------------------------------------------------===// 375 376 /// createFileID - Create a new FileID that represents the specified file 377 /// being #included from the specified IncludePosition. This returns 0 on 378 /// error and translates NULL into standard input. 379 /// PreallocateID should be non-zero to specify which a pre-allocated, 380 /// lazily computed source location is being filled in by this operation. 381 FileID createFileID(const FileEntry *SourceFile, SourceLocation IncludePos, 382 SrcMgr::CharacteristicKind FileCharacter, 383 unsigned PreallocatedID = 0, 384 unsigned Offset = 0) { 385 const SrcMgr::ContentCache *IR = getOrCreateContentCache(SourceFile); 386 if (IR == 0) return FileID(); // Error opening file? 387 return createFileID(IR, IncludePos, FileCharacter, PreallocatedID, Offset); 388 } 389 390 /// createFileIDForMemBuffer - Create a new FileID that represents the 391 /// specified memory buffer. This does no caching of the buffer and takes 392 /// ownership of the MemoryBuffer, so only pass a MemoryBuffer to this once. 393 FileID createFileIDForMemBuffer(const llvm::MemoryBuffer *Buffer, 394 unsigned PreallocatedID = 0, 395 unsigned Offset = 0) { 396 return createFileID(createMemBufferContentCache(Buffer), SourceLocation(), 397 SrcMgr::C_User, PreallocatedID, Offset); 398 } 399 400 /// createMainFileIDForMembuffer - Create the FileID for a memory buffer 401 /// that will represent the FileID for the main source. One example 402 /// of when this would be used is when the main source is read from STDIN. 403 FileID createMainFileIDForMemBuffer(const llvm::MemoryBuffer *Buffer) { 404 assert(MainFileID.isInvalid() && "MainFileID already set!"); 405 MainFileID = createFileIDForMemBuffer(Buffer); 406 return MainFileID; 407 } 408 409 /// createInstantiationLoc - Return a new SourceLocation that encodes the fact 410 /// that a token at Loc should actually be referenced from InstantiationLoc. 411 /// TokLength is the length of the token being instantiated. 412 SourceLocation createInstantiationLoc(SourceLocation Loc, 413 SourceLocation InstantiationLocStart, 414 SourceLocation InstantiationLocEnd, 415 unsigned TokLength, 416 unsigned PreallocatedID = 0, 417 unsigned Offset = 0); 418 419 /// \brief Retrieve the memory buffer associated with the given file. 420 const llvm::MemoryBuffer *getMemoryBufferForFile(const FileEntry *File); 421 422 /// \brief Override the contents of the given source file by providing an 423 /// already-allocated buffer. 424 /// 425 /// \param SourceFile the source file whose contents will be override. 426 /// 427 /// \param Buffer the memory buffer whose contents will be used as the 428 /// data in the given source file. 429 /// 430 /// \returns true if an error occurred, false otherwise. 431 bool overrideFileContents(const FileEntry *SourceFile, 432 const llvm::MemoryBuffer *Buffer); 433 434 //===--------------------------------------------------------------------===// 435 // FileID manipulation methods. 436 //===--------------------------------------------------------------------===// 437 438 /// getBuffer - Return the buffer for the specified FileID. If there is an 439 /// error opening this buffer the first time, this manufactures a temporary 440 /// buffer and returns a non-empty error string. 441 const llvm::MemoryBuffer *getBuffer(FileID FID) const { 442 return getSLocEntry(FID).getFile().getContentCache()->getBuffer(Diag); 443 } 444 445 /// getFileEntryForID - Returns the FileEntry record for the provided FileID. 446 const FileEntry *getFileEntryForID(FileID FID) const { 447 return getSLocEntry(FID).getFile().getContentCache()->Entry; 448 } 449 450 /// getBufferData - Return a pointer to the start and end of the source buffer 451 /// data for the specified FileID. 452 /// 453 /// \param FID The file ID whose contents will be returned. 454 /// \param Invalid If non-NULL, will be set true if an error occurred. 455 std::pair<const char*, const char*> getBufferData(FileID FID, 456 bool *Invalid = 0) const; 457 458 459 //===--------------------------------------------------------------------===// 460 // SourceLocation manipulation methods. 461 //===--------------------------------------------------------------------===// 462 463 /// getFileID - Return the FileID for a SourceLocation. This is a very 464 /// hot method that is used for all SourceManager queries that start with a 465 /// SourceLocation object. It is responsible for finding the entry in 466 /// SLocEntryTable which contains the specified location. 467 /// 468 FileID getFileID(SourceLocation SpellingLoc) const { 469 unsigned SLocOffset = SpellingLoc.getOffset(); 470 471 // If our one-entry cache covers this offset, just return it. 472 if (isOffsetInFileID(LastFileIDLookup, SLocOffset)) 473 return LastFileIDLookup; 474 475 return getFileIDSlow(SLocOffset); 476 } 477 478 /// getLocForStartOfFile - Return the source location corresponding to the 479 /// first byte of the specified file. 480 SourceLocation getLocForStartOfFile(FileID FID) const { 481 assert(FID.ID < SLocEntryTable.size() && "FileID out of range"); 482 assert(getSLocEntry(FID).isFile() && "FileID is not a file"); 483 unsigned FileOffset = getSLocEntry(FID).getOffset(); 484 return SourceLocation::getFileLoc(FileOffset); 485 } 486 487 /// getInstantiationLoc - Given a SourceLocation object, return the 488 /// instantiation location referenced by the ID. 489 SourceLocation getInstantiationLoc(SourceLocation Loc) const { 490 // Handle the non-mapped case inline, defer to out of line code to handle 491 // instantiations. 492 if (Loc.isFileID()) return Loc; 493 return getInstantiationLocSlowCase(Loc); 494 } 495 496 /// getImmediateInstantiationRange - Loc is required to be an instantiation 497 /// location. Return the start/end of the instantiation information. 498 std::pair<SourceLocation,SourceLocation> 499 getImmediateInstantiationRange(SourceLocation Loc) const; 500 501 /// getInstantiationRange - Given a SourceLocation object, return the 502 /// range of tokens covered by the instantiation in the ultimate file. 503 std::pair<SourceLocation,SourceLocation> 504 getInstantiationRange(SourceLocation Loc) const; 505 506 507 /// getSpellingLoc - Given a SourceLocation object, return the spelling 508 /// location referenced by the ID. This is the place where the characters 509 /// that make up the lexed token can be found. 510 SourceLocation getSpellingLoc(SourceLocation Loc) const { 511 // Handle the non-mapped case inline, defer to out of line code to handle 512 // instantiations. 513 if (Loc.isFileID()) return Loc; 514 return getSpellingLocSlowCase(Loc); 515 } 516 517 /// getImmediateSpellingLoc - Given a SourceLocation object, return the 518 /// spelling location referenced by the ID. This is the first level down 519 /// towards the place where the characters that make up the lexed token can be 520 /// found. This should not generally be used by clients. 521 SourceLocation getImmediateSpellingLoc(SourceLocation Loc) const; 522 523 /// getDecomposedLoc - Decompose the specified location into a raw FileID + 524 /// Offset pair. The first element is the FileID, the second is the 525 /// offset from the start of the buffer of the location. 526 std::pair<FileID, unsigned> getDecomposedLoc(SourceLocation Loc) const { 527 FileID FID = getFileID(Loc); 528 return std::make_pair(FID, Loc.getOffset()-getSLocEntry(FID).getOffset()); 529 } 530 531 /// getDecomposedInstantiationLoc - Decompose the specified location into a 532 /// raw FileID + Offset pair. If the location is an instantiation record, 533 /// walk through it until we find the final location instantiated. 534 std::pair<FileID, unsigned> 535 getDecomposedInstantiationLoc(SourceLocation Loc) const { 536 FileID FID = getFileID(Loc); 537 const SrcMgr::SLocEntry *E = &getSLocEntry(FID); 538 539 unsigned Offset = Loc.getOffset()-E->getOffset(); 540 if (Loc.isFileID()) 541 return std::make_pair(FID, Offset); 542 543 return getDecomposedInstantiationLocSlowCase(E, Offset); 544 } 545 546 /// getDecomposedSpellingLoc - Decompose the specified location into a raw 547 /// FileID + Offset pair. If the location is an instantiation record, walk 548 /// through it until we find its spelling record. 549 std::pair<FileID, unsigned> 550 getDecomposedSpellingLoc(SourceLocation Loc) const { 551 FileID FID = getFileID(Loc); 552 const SrcMgr::SLocEntry *E = &getSLocEntry(FID); 553 554 unsigned Offset = Loc.getOffset()-E->getOffset(); 555 if (Loc.isFileID()) 556 return std::make_pair(FID, Offset); 557 return getDecomposedSpellingLocSlowCase(E, Offset); 558 } 559 560 /// getFileOffset - This method returns the offset from the start 561 /// of the file that the specified SourceLocation represents. This is not very 562 /// meaningful for a macro ID. 563 unsigned getFileOffset(SourceLocation SpellingLoc) const { 564 return getDecomposedLoc(SpellingLoc).second; 565 } 566 567 568 //===--------------------------------------------------------------------===// 569 // Queries about the code at a SourceLocation. 570 //===--------------------------------------------------------------------===// 571 572 /// getCharacterData - Return a pointer to the start of the specified location 573 /// in the appropriate spelling MemoryBuffer. 574 const char *getCharacterData(SourceLocation SL) const; 575 576 /// getColumnNumber - Return the column # for the specified file position. 577 /// This is significantly cheaper to compute than the line number. This 578 /// returns zero if the column number isn't known. This may only be called on 579 /// a file sloc, so you must choose a spelling or instantiation location 580 /// before calling this method. 581 unsigned getColumnNumber(FileID FID, unsigned FilePos) const; 582 unsigned getSpellingColumnNumber(SourceLocation Loc) const; 583 unsigned getInstantiationColumnNumber(SourceLocation Loc) const; 584 585 586 /// getLineNumber - Given a SourceLocation, return the spelling line number 587 /// for the position indicated. This requires building and caching a table of 588 /// line offsets for the MemoryBuffer, so this is not cheap: use only when 589 /// about to emit a diagnostic. 590 unsigned getLineNumber(FileID FID, unsigned FilePos) const; 591 592 unsigned getInstantiationLineNumber(SourceLocation Loc) const; 593 unsigned getSpellingLineNumber(SourceLocation Loc) const; 594 595 /// Return the filename or buffer identifier of the buffer the location is in. 596 /// Note that this name does not respect #line directives. Use getPresumedLoc 597 /// for normal clients. 598 const char *getBufferName(SourceLocation Loc) const; 599 600 /// getFileCharacteristic - return the file characteristic of the specified 601 /// source location, indicating whether this is a normal file, a system 602 /// header, or an "implicit extern C" system header. 603 /// 604 /// This state can be modified with flags on GNU linemarker directives like: 605 /// # 4 "foo.h" 3 606 /// which changes all source locations in the current file after that to be 607 /// considered to be from a system header. 608 SrcMgr::CharacteristicKind getFileCharacteristic(SourceLocation Loc) const; 609 610 /// getPresumedLoc - This method returns the "presumed" location of a 611 /// SourceLocation specifies. A "presumed location" can be modified by #line 612 /// or GNU line marker directives. This provides a view on the data that a 613 /// user should see in diagnostics, for example. 614 /// 615 /// Note that a presumed location is always given as the instantiation point 616 /// of an instantiation location, not at the spelling location. 617 PresumedLoc getPresumedLoc(SourceLocation Loc) const; 618 619 /// isFromSameFile - Returns true if both SourceLocations correspond to 620 /// the same file. 621 bool isFromSameFile(SourceLocation Loc1, SourceLocation Loc2) const { 622 return getFileID(Loc1) == getFileID(Loc2); 623 } 624 625 /// isFromMainFile - Returns true if the file of provided SourceLocation is 626 /// the main file. 627 bool isFromMainFile(SourceLocation Loc) const { 628 return getFileID(Loc) == getMainFileID(); 629 } 630 631 /// isInSystemHeader - Returns if a SourceLocation is in a system header. 632 bool isInSystemHeader(SourceLocation Loc) const { 633 return getFileCharacteristic(Loc) != SrcMgr::C_User; 634 } 635 636 /// isInExternCSystemHeader - Returns if a SourceLocation is in an "extern C" 637 /// system header. 638 bool isInExternCSystemHeader(SourceLocation Loc) const { 639 return getFileCharacteristic(Loc) == SrcMgr::C_ExternCSystem; 640 } 641 642 //===--------------------------------------------------------------------===// 643 // Line Table Manipulation Routines 644 //===--------------------------------------------------------------------===// 645 646 /// getLineTableFilenameID - Return the uniqued ID for the specified filename. 647 /// 648 unsigned getLineTableFilenameID(const char *Ptr, unsigned Len); 649 650 /// AddLineNote - Add a line note to the line table for the FileID and offset 651 /// specified by Loc. If FilenameID is -1, it is considered to be 652 /// unspecified. 653 void AddLineNote(SourceLocation Loc, unsigned LineNo, int FilenameID); 654 void AddLineNote(SourceLocation Loc, unsigned LineNo, int FilenameID, 655 bool IsFileEntry, bool IsFileExit, 656 bool IsSystemHeader, bool IsExternCHeader); 657 658 /// \brief Determine if the source manager has a line table. 659 bool hasLineTable() const { return LineTable != 0; } 660 661 /// \brief Retrieve the stored line table. 662 LineTableInfo &getLineTable(); 663 664 //===--------------------------------------------------------------------===// 665 // Other miscellaneous methods. 666 //===--------------------------------------------------------------------===// 667 668 /// \brief Get the source location for the given file:line:col triplet. 669 /// 670 /// If the source file is included multiple times, the source location will 671 /// be based upon the first inclusion. 672 SourceLocation getLocation(const FileEntry *SourceFile, 673 unsigned Line, unsigned Col) const; 674 675 /// \brief Determines the order of 2 source locations in the translation unit. 676 /// 677 /// \returns true if LHS source location comes before RHS, false otherwise. 678 bool isBeforeInTranslationUnit(SourceLocation LHS, SourceLocation RHS) const; 679 680 // Iterators over FileInfos. 681 typedef llvm::DenseMap<const FileEntry*, SrcMgr::ContentCache*> 682 ::const_iterator fileinfo_iterator; 683 fileinfo_iterator fileinfo_begin() const { return FileInfos.begin(); } 684 fileinfo_iterator fileinfo_end() const { return FileInfos.end(); } 685 bool hasFileInfo(const FileEntry *File) const { 686 return FileInfos.find(File) != FileInfos.end(); 687 } 688 689 /// PrintStats - Print statistics to stderr. 690 /// 691 void PrintStats() const; 692 693 unsigned sloc_entry_size() const { return SLocEntryTable.size(); } 694 695 // FIXME: Exposing this is a little gross; what we want is a good way 696 // to iterate the entries that were not defined in a PCH file (or 697 // any other external source). 698 unsigned sloc_loaded_entry_size() const { return SLocEntryLoaded.size(); } 699 700 const SrcMgr::SLocEntry &getSLocEntry(unsigned ID) const { 701 assert(ID < SLocEntryTable.size() && "Invalid id"); 702 if (ExternalSLocEntries && 703 ID < SLocEntryLoaded.size() && 704 !SLocEntryLoaded[ID]) 705 ExternalSLocEntries->ReadSLocEntry(ID); 706 return SLocEntryTable[ID]; 707 } 708 709 const SrcMgr::SLocEntry &getSLocEntry(FileID FID) const { 710 return getSLocEntry(FID.ID); 711 } 712 713 unsigned getNextOffset() const { return NextOffset; } 714 715 /// \brief Preallocate some number of source location entries, which 716 /// will be loaded as needed from the given external source. 717 void PreallocateSLocEntries(ExternalSLocEntrySource *Source, 718 unsigned NumSLocEntries, 719 unsigned NextOffset); 720 721 /// \brief Clear out any preallocated source location entries that 722 /// haven't already been loaded. 723 void ClearPreallocatedSLocEntries(); 724 725private: 726 /// isOffsetInFileID - Return true if the specified FileID contains the 727 /// specified SourceLocation offset. This is a very hot method. 728 inline bool isOffsetInFileID(FileID FID, unsigned SLocOffset) const { 729 const SrcMgr::SLocEntry &Entry = getSLocEntry(FID); 730 // If the entry is after the offset, it can't contain it. 731 if (SLocOffset < Entry.getOffset()) return false; 732 733 // If this is the last entry than it does. Otherwise, the entry after it 734 // has to not include it. 735 if (FID.ID+1 == SLocEntryTable.size()) return true; 736 737 return SLocOffset < getSLocEntry(FileID::get(FID.ID+1)).getOffset(); 738 } 739 740 /// createFileID - Create a new fileID for the specified ContentCache and 741 /// include position. This works regardless of whether the ContentCache 742 /// corresponds to a file or some other input source. 743 FileID createFileID(const SrcMgr::ContentCache* File, 744 SourceLocation IncludePos, 745 SrcMgr::CharacteristicKind DirCharacter, 746 unsigned PreallocatedID = 0, 747 unsigned Offset = 0); 748 749 const SrcMgr::ContentCache * 750 getOrCreateContentCache(const FileEntry *SourceFile); 751 752 /// createMemBufferContentCache - Create a new ContentCache for the specified 753 /// memory buffer. 754 const SrcMgr::ContentCache* 755 createMemBufferContentCache(const llvm::MemoryBuffer *Buf); 756 757 FileID getFileIDSlow(unsigned SLocOffset) const; 758 759 SourceLocation getInstantiationLocSlowCase(SourceLocation Loc) const; 760 SourceLocation getSpellingLocSlowCase(SourceLocation Loc) const; 761 762 std::pair<FileID, unsigned> 763 getDecomposedInstantiationLocSlowCase(const SrcMgr::SLocEntry *E, 764 unsigned Offset) const; 765 std::pair<FileID, unsigned> 766 getDecomposedSpellingLocSlowCase(const SrcMgr::SLocEntry *E, 767 unsigned Offset) const; 768}; 769 770 771} // end namespace clang 772 773#endif 774