clang  3.8.0
SourceManager.cpp
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1 //===--- SourceManager.cpp - Track and cache source files -----------------===//
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 implements the SourceManager interface.
11 //
12 //===----------------------------------------------------------------------===//
13 
15 #include "clang/Basic/Diagnostic.h"
18 #include "llvm/ADT/Optional.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/ADT/StringSwitch.h"
21 #include "llvm/Support/Capacity.h"
22 #include "llvm/Support/Compiler.h"
23 #include "llvm/Support/MemoryBuffer.h"
24 #include "llvm/Support/Path.h"
25 #include "llvm/Support/raw_ostream.h"
26 #include <algorithm>
27 #include <cstring>
28 #include <string>
29 
30 using namespace clang;
31 using namespace SrcMgr;
32 using llvm::MemoryBuffer;
33 
34 //===----------------------------------------------------------------------===//
35 // SourceManager Helper Classes
36 //===----------------------------------------------------------------------===//
37 
38 ContentCache::~ContentCache() {
39  if (shouldFreeBuffer())
40  delete Buffer.getPointer();
41 }
42 
43 /// getSizeBytesMapped - Returns the number of bytes actually mapped for this
44 /// ContentCache. This can be 0 if the MemBuffer was not actually expanded.
45 unsigned ContentCache::getSizeBytesMapped() const {
46  return Buffer.getPointer() ? Buffer.getPointer()->getBufferSize() : 0;
47 }
48 
49 /// Returns the kind of memory used to back the memory buffer for
50 /// this content cache. This is used for performance analysis.
51 llvm::MemoryBuffer::BufferKind ContentCache::getMemoryBufferKind() const {
52  assert(Buffer.getPointer());
53 
54  // Should be unreachable, but keep for sanity.
55  if (!Buffer.getPointer())
56  return llvm::MemoryBuffer::MemoryBuffer_Malloc;
57 
58  llvm::MemoryBuffer *buf = Buffer.getPointer();
59  return buf->getBufferKind();
60 }
61 
62 /// getSize - Returns the size of the content encapsulated by this ContentCache.
63 /// This can be the size of the source file or the size of an arbitrary
64 /// scratch buffer. If the ContentCache encapsulates a source file, that
65 /// file is not lazily brought in from disk to satisfy this query.
66 unsigned ContentCache::getSize() const {
67  return Buffer.getPointer() ? (unsigned) Buffer.getPointer()->getBufferSize()
68  : (unsigned) ContentsEntry->getSize();
69 }
70 
71 void ContentCache::replaceBuffer(llvm::MemoryBuffer *B, bool DoNotFree) {
72  if (B && B == Buffer.getPointer()) {
73  assert(0 && "Replacing with the same buffer");
74  Buffer.setInt(DoNotFree? DoNotFreeFlag : 0);
75  return;
76  }
77 
78  if (shouldFreeBuffer())
79  delete Buffer.getPointer();
80  Buffer.setPointer(B);
81  Buffer.setInt(DoNotFree? DoNotFreeFlag : 0);
82 }
83 
84 llvm::MemoryBuffer *ContentCache::getBuffer(DiagnosticsEngine &Diag,
85  const SourceManager &SM,
86  SourceLocation Loc,
87  bool *Invalid) const {
88  // Lazily create the Buffer for ContentCaches that wrap files. If we already
89  // computed it, just return what we have.
90  if (Buffer.getPointer() || !ContentsEntry) {
91  if (Invalid)
92  *Invalid = isBufferInvalid();
93 
94  return Buffer.getPointer();
95  }
96 
97  bool isVolatile = SM.userFilesAreVolatile() && !IsSystemFile;
98  auto BufferOrError =
99  SM.getFileManager().getBufferForFile(ContentsEntry, isVolatile);
100 
101  // If we were unable to open the file, then we are in an inconsistent
102  // situation where the content cache referenced a file which no longer
103  // exists. Most likely, we were using a stat cache with an invalid entry but
104  // the file could also have been removed during processing. Since we can't
105  // really deal with this situation, just create an empty buffer.
106  //
107  // FIXME: This is definitely not ideal, but our immediate clients can't
108  // currently handle returning a null entry here. Ideally we should detect
109  // that we are in an inconsistent situation and error out as quickly as
110  // possible.
111  if (!BufferOrError) {
112  StringRef FillStr("<<<MISSING SOURCE FILE>>>\n");
113  Buffer.setPointer(MemoryBuffer::getNewUninitMemBuffer(
114  ContentsEntry->getSize(), "<invalid>").release());
115  char *Ptr = const_cast<char*>(Buffer.getPointer()->getBufferStart());
116  for (unsigned i = 0, e = ContentsEntry->getSize(); i != e; ++i)
117  Ptr[i] = FillStr[i % FillStr.size()];
118 
119  if (Diag.isDiagnosticInFlight())
120  Diag.SetDelayedDiagnostic(diag::err_cannot_open_file,
121  ContentsEntry->getName(),
122  BufferOrError.getError().message());
123  else
124  Diag.Report(Loc, diag::err_cannot_open_file)
125  << ContentsEntry->getName() << BufferOrError.getError().message();
126 
127  Buffer.setInt(Buffer.getInt() | InvalidFlag);
128 
129  if (Invalid) *Invalid = true;
130  return Buffer.getPointer();
131  }
132 
133  Buffer.setPointer(BufferOrError->release());
134 
135  // Check that the file's size is the same as in the file entry (which may
136  // have come from a stat cache).
137  if (getRawBuffer()->getBufferSize() != (size_t)ContentsEntry->getSize()) {
138  if (Diag.isDiagnosticInFlight())
139  Diag.SetDelayedDiagnostic(diag::err_file_modified,
140  ContentsEntry->getName());
141  else
142  Diag.Report(Loc, diag::err_file_modified)
143  << ContentsEntry->getName();
144 
145  Buffer.setInt(Buffer.getInt() | InvalidFlag);
146  if (Invalid) *Invalid = true;
147  return Buffer.getPointer();
148  }
149 
150  // If the buffer is valid, check to see if it has a UTF Byte Order Mark
151  // (BOM). We only support UTF-8 with and without a BOM right now. See
152  // http://en.wikipedia.org/wiki/Byte_order_mark for more information.
153  StringRef BufStr = Buffer.getPointer()->getBuffer();
154  const char *InvalidBOM = llvm::StringSwitch<const char *>(BufStr)
155  .StartsWith("\xFE\xFF", "UTF-16 (BE)")
156  .StartsWith("\xFF\xFE", "UTF-16 (LE)")
157  .StartsWith("\x00\x00\xFE\xFF", "UTF-32 (BE)")
158  .StartsWith("\xFF\xFE\x00\x00", "UTF-32 (LE)")
159  .StartsWith("\x2B\x2F\x76", "UTF-7")
160  .StartsWith("\xF7\x64\x4C", "UTF-1")
161  .StartsWith("\xDD\x73\x66\x73", "UTF-EBCDIC")
162  .StartsWith("\x0E\xFE\xFF", "SDSU")
163  .StartsWith("\xFB\xEE\x28", "BOCU-1")
164  .StartsWith("\x84\x31\x95\x33", "GB-18030")
165  .Default(nullptr);
166 
167  if (InvalidBOM) {
168  Diag.Report(Loc, diag::err_unsupported_bom)
169  << InvalidBOM << ContentsEntry->getName();
170  Buffer.setInt(Buffer.getInt() | InvalidFlag);
171  }
172 
173  if (Invalid)
174  *Invalid = isBufferInvalid();
175 
176  return Buffer.getPointer();
177 }
178 
180  auto IterBool =
181  FilenameIDs.insert(std::make_pair(Name, FilenamesByID.size()));
182  if (IterBool.second)
183  FilenamesByID.push_back(&*IterBool.first);
184  return IterBool.first->second;
185 }
186 
187 /// AddLineNote - Add a line note to the line table that indicates that there
188 /// is a \#line at the specified FID/Offset location which changes the presumed
189 /// location to LineNo/FilenameID.
191  unsigned LineNo, int FilenameID) {
192  std::vector<LineEntry> &Entries = LineEntries[FID];
193 
194  assert((Entries.empty() || Entries.back().FileOffset < Offset) &&
195  "Adding line entries out of order!");
196 
198  unsigned IncludeOffset = 0;
199 
200  if (!Entries.empty()) {
201  // If this is a '#line 4' after '#line 42 "foo.h"', make sure to remember
202  // that we are still in "foo.h".
203  if (FilenameID == -1)
204  FilenameID = Entries.back().FilenameID;
205 
206  // If we are after a line marker that switched us to system header mode, or
207  // that set #include information, preserve it.
208  Kind = Entries.back().FileKind;
209  IncludeOffset = Entries.back().IncludeOffset;
210  }
211 
212  Entries.push_back(LineEntry::get(Offset, LineNo, FilenameID, Kind,
213  IncludeOffset));
214 }
215 
216 /// AddLineNote This is the same as the previous version of AddLineNote, but is
217 /// used for GNU line markers. If EntryExit is 0, then this doesn't change the
218 /// presumed \#include stack. If it is 1, this is a file entry, if it is 2 then
219 /// this is a file exit. FileKind specifies whether this is a system header or
220 /// extern C system header.
222  unsigned LineNo, int FilenameID,
223  unsigned EntryExit,
224  SrcMgr::CharacteristicKind FileKind) {
225  assert(FilenameID != -1 && "Unspecified filename should use other accessor");
226 
227  std::vector<LineEntry> &Entries = LineEntries[FID];
228 
229  assert((Entries.empty() || Entries.back().FileOffset < Offset) &&
230  "Adding line entries out of order!");
231 
232  unsigned IncludeOffset = 0;
233  if (EntryExit == 0) { // No #include stack change.
234  IncludeOffset = Entries.empty() ? 0 : Entries.back().IncludeOffset;
235  } else if (EntryExit == 1) {
236  IncludeOffset = Offset-1;
237  } else if (EntryExit == 2) {
238  assert(!Entries.empty() && Entries.back().IncludeOffset &&
239  "PPDirectives should have caught case when popping empty include stack");
240 
241  // Get the include loc of the last entries' include loc as our include loc.
242  IncludeOffset = 0;
243  if (const LineEntry *PrevEntry =
244  FindNearestLineEntry(FID, Entries.back().IncludeOffset))
245  IncludeOffset = PrevEntry->IncludeOffset;
246  }
247 
248  Entries.push_back(LineEntry::get(Offset, LineNo, FilenameID, FileKind,
249  IncludeOffset));
250 }
251 
252 
253 /// FindNearestLineEntry - Find the line entry nearest to FID that is before
254 /// it. If there is no line entry before Offset in FID, return null.
256  unsigned Offset) {
257  const std::vector<LineEntry> &Entries = LineEntries[FID];
258  assert(!Entries.empty() && "No #line entries for this FID after all!");
259 
260  // It is very common for the query to be after the last #line, check this
261  // first.
262  if (Entries.back().FileOffset <= Offset)
263  return &Entries.back();
264 
265  // Do a binary search to find the maximal element that is still before Offset.
266  std::vector<LineEntry>::const_iterator I =
267  std::upper_bound(Entries.begin(), Entries.end(), Offset);
268  if (I == Entries.begin()) return nullptr;
269  return &*--I;
270 }
271 
272 /// \brief Add a new line entry that has already been encoded into
273 /// the internal representation of the line table.
275  const std::vector<LineEntry> &Entries) {
276  LineEntries[FID] = Entries;
277 }
278 
279 /// getLineTableFilenameID - Return the uniqued ID for the specified filename.
280 ///
282  return getLineTable().getLineTableFilenameID(Name);
283 }
284 
285 
286 /// AddLineNote - Add a line note to the line table for the FileID and offset
287 /// specified by Loc. If FilenameID is -1, it is considered to be
288 /// unspecified.
289 void SourceManager::AddLineNote(SourceLocation Loc, unsigned LineNo,
290  int FilenameID) {
291  std::pair<FileID, unsigned> LocInfo = getDecomposedExpansionLoc(Loc);
292 
293  bool Invalid = false;
294  const SLocEntry &Entry = getSLocEntry(LocInfo.first, &Invalid);
295  if (!Entry.isFile() || Invalid)
296  return;
297 
298  const SrcMgr::FileInfo &FileInfo = Entry.getFile();
299 
300  // Remember that this file has #line directives now if it doesn't already.
301  const_cast<SrcMgr::FileInfo&>(FileInfo).setHasLineDirectives();
302 
303  getLineTable().AddLineNote(LocInfo.first, LocInfo.second, LineNo, FilenameID);
304 }
305 
306 /// AddLineNote - Add a GNU line marker to the line table.
307 void SourceManager::AddLineNote(SourceLocation Loc, unsigned LineNo,
308  int FilenameID, bool IsFileEntry,
309  bool IsFileExit, bool IsSystemHeader,
310  bool IsExternCHeader) {
311  // If there is no filename and no flags, this is treated just like a #line,
312  // which does not change the flags of the previous line marker.
313  if (FilenameID == -1) {
314  assert(!IsFileEntry && !IsFileExit && !IsSystemHeader && !IsExternCHeader &&
315  "Can't set flags without setting the filename!");
316  return AddLineNote(Loc, LineNo, FilenameID);
317  }
318 
319  std::pair<FileID, unsigned> LocInfo = getDecomposedExpansionLoc(Loc);
320 
321  bool Invalid = false;
322  const SLocEntry &Entry = getSLocEntry(LocInfo.first, &Invalid);
323  if (!Entry.isFile() || Invalid)
324  return;
325 
326  const SrcMgr::FileInfo &FileInfo = Entry.getFile();
327 
328  // Remember that this file has #line directives now if it doesn't already.
329  const_cast<SrcMgr::FileInfo&>(FileInfo).setHasLineDirectives();
330 
331  (void) getLineTable();
332 
334  if (IsExternCHeader)
335  FileKind = SrcMgr::C_ExternCSystem;
336  else if (IsSystemHeader)
337  FileKind = SrcMgr::C_System;
338  else
339  FileKind = SrcMgr::C_User;
340 
341  unsigned EntryExit = 0;
342  if (IsFileEntry)
343  EntryExit = 1;
344  else if (IsFileExit)
345  EntryExit = 2;
346 
347  LineTable->AddLineNote(LocInfo.first, LocInfo.second, LineNo, FilenameID,
348  EntryExit, FileKind);
349 }
350 
352  if (!LineTable)
353  LineTable = new LineTableInfo();
354  return *LineTable;
355 }
356 
357 //===----------------------------------------------------------------------===//
358 // Private 'Create' methods.
359 //===----------------------------------------------------------------------===//
360 
361 SourceManager::SourceManager(DiagnosticsEngine &Diag, FileManager &FileMgr,
362  bool UserFilesAreVolatile)
363  : Diag(Diag), FileMgr(FileMgr), OverridenFilesKeepOriginalName(true),
364  UserFilesAreVolatile(UserFilesAreVolatile), FilesAreTransient(false),
365  ExternalSLocEntries(nullptr), LineTable(nullptr), NumLinearScans(0),
366  NumBinaryProbes(0) {
367  clearIDTables();
368  Diag.setSourceManager(this);
369 }
370 
372  delete LineTable;
373 
374  // Delete FileEntry objects corresponding to content caches. Since the actual
375  // content cache objects are bump pointer allocated, we just have to run the
376  // dtors, but we call the deallocate method for completeness.
377  for (unsigned i = 0, e = MemBufferInfos.size(); i != e; ++i) {
378  if (MemBufferInfos[i]) {
379  MemBufferInfos[i]->~ContentCache();
380  ContentCacheAlloc.Deallocate(MemBufferInfos[i]);
381  }
382  }
384  I = FileInfos.begin(), E = FileInfos.end(); I != E; ++I) {
385  if (I->second) {
386  I->second->~ContentCache();
387  ContentCacheAlloc.Deallocate(I->second);
388  }
389  }
390 
391  llvm::DeleteContainerSeconds(MacroArgsCacheMap);
392 }
393 
395  MainFileID = FileID();
396  LocalSLocEntryTable.clear();
397  LoadedSLocEntryTable.clear();
398  SLocEntryLoaded.clear();
399  LastLineNoFileIDQuery = FileID();
400  LastLineNoContentCache = nullptr;
401  LastFileIDLookup = FileID();
402 
403  if (LineTable)
404  LineTable->clear();
405 
406  // Use up FileID #0 as an invalid expansion.
407  NextLocalOffset = 0;
408  CurrentLoadedOffset = MaxLoadedOffset;
410 }
411 
412 /// getOrCreateContentCache - Create or return a cached ContentCache for the
413 /// specified file.
414 const ContentCache *
415 SourceManager::getOrCreateContentCache(const FileEntry *FileEnt,
416  bool isSystemFile) {
417  assert(FileEnt && "Didn't specify a file entry to use?");
418 
419  // Do we already have information about this file?
420  ContentCache *&Entry = FileInfos[FileEnt];
421  if (Entry) return Entry;
422 
423  // Nope, create a new Cache entry.
424  Entry = ContentCacheAlloc.Allocate<ContentCache>();
425 
426  if (OverriddenFilesInfo) {
427  // If the file contents are overridden with contents from another file,
428  // pass that file to ContentCache.
430  overI = OverriddenFilesInfo->OverriddenFiles.find(FileEnt);
431  if (overI == OverriddenFilesInfo->OverriddenFiles.end())
432  new (Entry) ContentCache(FileEnt);
433  else
434  new (Entry) ContentCache(OverridenFilesKeepOriginalName ? FileEnt
435  : overI->second,
436  overI->second);
437  } else {
438  new (Entry) ContentCache(FileEnt);
439  }
440 
441  Entry->IsSystemFile = isSystemFile;
442  Entry->IsTransient = FilesAreTransient;
443 
444  return Entry;
445 }
446 
447 
448 /// createMemBufferContentCache - Create a new ContentCache for the specified
449 /// memory buffer. This does no caching.
450 const ContentCache *SourceManager::createMemBufferContentCache(
451  std::unique_ptr<llvm::MemoryBuffer> Buffer) {
452  // Add a new ContentCache to the MemBufferInfos list and return it.
453  ContentCache *Entry = ContentCacheAlloc.Allocate<ContentCache>();
454  new (Entry) ContentCache();
455  MemBufferInfos.push_back(Entry);
456  Entry->setBuffer(std::move(Buffer));
457  return Entry;
458 }
459 
460 const SrcMgr::SLocEntry &SourceManager::loadSLocEntry(unsigned Index,
461  bool *Invalid) const {
462  assert(!SLocEntryLoaded[Index]);
463  if (ExternalSLocEntries->ReadSLocEntry(-(static_cast<int>(Index) + 2))) {
464  if (Invalid)
465  *Invalid = true;
466  // If the file of the SLocEntry changed we could still have loaded it.
467  if (!SLocEntryLoaded[Index]) {
468  // Try to recover; create a SLocEntry so the rest of clang can handle it.
469  LoadedSLocEntryTable[Index] = SLocEntry::get(0,
470  FileInfo::get(SourceLocation(),
471  getFakeContentCacheForRecovery(),
472  SrcMgr::C_User));
473  }
474  }
475 
476  return LoadedSLocEntryTable[Index];
477 }
478 
479 std::pair<int, unsigned>
481  unsigned TotalSize) {
482  assert(ExternalSLocEntries && "Don't have an external sloc source");
483  // Make sure we're not about to run out of source locations.
484  if (CurrentLoadedOffset - TotalSize < NextLocalOffset)
485  return std::make_pair(0, 0);
486  LoadedSLocEntryTable.resize(LoadedSLocEntryTable.size() + NumSLocEntries);
487  SLocEntryLoaded.resize(LoadedSLocEntryTable.size());
488  CurrentLoadedOffset -= TotalSize;
489  int ID = LoadedSLocEntryTable.size();
490  return std::make_pair(-ID - 1, CurrentLoadedOffset);
491 }
492 
493 /// \brief As part of recovering from missing or changed content, produce a
494 /// fake, non-empty buffer.
495 llvm::MemoryBuffer *SourceManager::getFakeBufferForRecovery() const {
496  if (!FakeBufferForRecovery)
497  FakeBufferForRecovery =
498  llvm::MemoryBuffer::getMemBuffer("<<<INVALID BUFFER>>");
499 
500  return FakeBufferForRecovery.get();
501 }
502 
503 /// \brief As part of recovering from missing or changed content, produce a
504 /// fake content cache.
505 const SrcMgr::ContentCache *
506 SourceManager::getFakeContentCacheForRecovery() const {
507  if (!FakeContentCacheForRecovery) {
508  FakeContentCacheForRecovery = llvm::make_unique<SrcMgr::ContentCache>();
509  FakeContentCacheForRecovery->replaceBuffer(getFakeBufferForRecovery(),
510  /*DoNotFree=*/true);
511  }
512  return FakeContentCacheForRecovery.get();
513 }
514 
515 /// \brief Returns the previous in-order FileID or an invalid FileID if there
516 /// is no previous one.
517 FileID SourceManager::getPreviousFileID(FileID FID) const {
518  if (FID.isInvalid())
519  return FileID();
520 
521  int ID = FID.ID;
522  if (ID == -1)
523  return FileID();
524 
525  if (ID > 0) {
526  if (ID-1 == 0)
527  return FileID();
528  } else if (unsigned(-(ID-1) - 2) >= LoadedSLocEntryTable.size()) {
529  return FileID();
530  }
531 
532  return FileID::get(ID-1);
533 }
534 
535 /// \brief Returns the next in-order FileID or an invalid FileID if there is
536 /// no next one.
537 FileID SourceManager::getNextFileID(FileID FID) const {
538  if (FID.isInvalid())
539  return FileID();
540 
541  int ID = FID.ID;
542  if (ID > 0) {
543  if (unsigned(ID+1) >= local_sloc_entry_size())
544  return FileID();
545  } else if (ID+1 >= -1) {
546  return FileID();
547  }
548 
549  return FileID::get(ID+1);
550 }
551 
552 //===----------------------------------------------------------------------===//
553 // Methods to create new FileID's and macro expansions.
554 //===----------------------------------------------------------------------===//
555 
556 /// createFileID - Create a new FileID for the specified ContentCache and
557 /// include position. This works regardless of whether the ContentCache
558 /// corresponds to a file or some other input source.
559 FileID SourceManager::createFileID(const ContentCache *File,
560  SourceLocation IncludePos,
561  SrcMgr::CharacteristicKind FileCharacter,
562  int LoadedID, unsigned LoadedOffset) {
563  if (LoadedID < 0) {
564  assert(LoadedID != -1 && "Loading sentinel FileID");
565  unsigned Index = unsigned(-LoadedID) - 2;
566  assert(Index < LoadedSLocEntryTable.size() && "FileID out of range");
567  assert(!SLocEntryLoaded[Index] && "FileID already loaded");
568  LoadedSLocEntryTable[Index] = SLocEntry::get(LoadedOffset,
569  FileInfo::get(IncludePos, File, FileCharacter));
570  SLocEntryLoaded[Index] = true;
571  return FileID::get(LoadedID);
572  }
573  LocalSLocEntryTable.push_back(SLocEntry::get(NextLocalOffset,
574  FileInfo::get(IncludePos, File,
575  FileCharacter)));
576  unsigned FileSize = File->getSize();
577  assert(NextLocalOffset + FileSize + 1 > NextLocalOffset &&
578  NextLocalOffset + FileSize + 1 <= CurrentLoadedOffset &&
579  "Ran out of source locations!");
580  // We do a +1 here because we want a SourceLocation that means "the end of the
581  // file", e.g. for the "no newline at the end of the file" diagnostic.
582  NextLocalOffset += FileSize + 1;
583 
584  // Set LastFileIDLookup to the newly created file. The next getFileID call is
585  // almost guaranteed to be from that file.
586  FileID FID = FileID::get(LocalSLocEntryTable.size()-1);
587  return LastFileIDLookup = FID;
588 }
589 
592  SourceLocation ExpansionLoc,
593  unsigned TokLength) {
594  ExpansionInfo Info = ExpansionInfo::createForMacroArg(SpellingLoc,
595  ExpansionLoc);
596  return createExpansionLocImpl(Info, TokLength);
597 }
598 
601  SourceLocation ExpansionLocStart,
602  SourceLocation ExpansionLocEnd,
603  unsigned TokLength,
604  int LoadedID,
605  unsigned LoadedOffset) {
606  ExpansionInfo Info = ExpansionInfo::create(SpellingLoc, ExpansionLocStart,
607  ExpansionLocEnd);
608  return createExpansionLocImpl(Info, TokLength, LoadedID, LoadedOffset);
609 }
610 
612 SourceManager::createExpansionLocImpl(const ExpansionInfo &Info,
613  unsigned TokLength,
614  int LoadedID,
615  unsigned LoadedOffset) {
616  if (LoadedID < 0) {
617  assert(LoadedID != -1 && "Loading sentinel FileID");
618  unsigned Index = unsigned(-LoadedID) - 2;
619  assert(Index < LoadedSLocEntryTable.size() && "FileID out of range");
620  assert(!SLocEntryLoaded[Index] && "FileID already loaded");
621  LoadedSLocEntryTable[Index] = SLocEntry::get(LoadedOffset, Info);
622  SLocEntryLoaded[Index] = true;
623  return SourceLocation::getMacroLoc(LoadedOffset);
624  }
625  LocalSLocEntryTable.push_back(SLocEntry::get(NextLocalOffset, Info));
626  assert(NextLocalOffset + TokLength + 1 > NextLocalOffset &&
627  NextLocalOffset + TokLength + 1 <= CurrentLoadedOffset &&
628  "Ran out of source locations!");
629  // See createFileID for that +1.
630  NextLocalOffset += TokLength + 1;
631  return SourceLocation::getMacroLoc(NextLocalOffset - (TokLength + 1));
632 }
633 
634 llvm::MemoryBuffer *SourceManager::getMemoryBufferForFile(const FileEntry *File,
635  bool *Invalid) {
636  const SrcMgr::ContentCache *IR = getOrCreateContentCache(File);
637  assert(IR && "getOrCreateContentCache() cannot return NULL");
638  return IR->getBuffer(Diag, *this, SourceLocation(), Invalid);
639 }
640 
642  llvm::MemoryBuffer *Buffer,
643  bool DoNotFree) {
644  const SrcMgr::ContentCache *IR = getOrCreateContentCache(SourceFile);
645  assert(IR && "getOrCreateContentCache() cannot return NULL");
646 
647  const_cast<SrcMgr::ContentCache *>(IR)->replaceBuffer(Buffer, DoNotFree);
648  const_cast<SrcMgr::ContentCache *>(IR)->BufferOverridden = true;
649 
650  getOverriddenFilesInfo().OverriddenFilesWithBuffer.insert(SourceFile);
651 }
652 
654  const FileEntry *NewFile) {
655  assert(SourceFile->getSize() == NewFile->getSize() &&
656  "Different sizes, use the FileManager to create a virtual file with "
657  "the correct size");
658  assert(FileInfos.count(SourceFile) == 0 &&
659  "This function should be called at the initialization stage, before "
660  "any parsing occurs.");
661  getOverriddenFilesInfo().OverriddenFiles[SourceFile] = NewFile;
662 }
663 
665  if (!isFileOverridden(File))
666  return;
667 
668  const SrcMgr::ContentCache *IR = getOrCreateContentCache(File);
669  const_cast<SrcMgr::ContentCache *>(IR)->replaceBuffer(nullptr);
670  const_cast<SrcMgr::ContentCache *>(IR)->ContentsEntry = IR->OrigEntry;
671 
672  assert(OverriddenFilesInfo);
673  OverriddenFilesInfo->OverriddenFiles.erase(File);
674  OverriddenFilesInfo->OverriddenFilesWithBuffer.erase(File);
675 }
676 
678  const SrcMgr::ContentCache *CC = getOrCreateContentCache(File);
679  const_cast<SrcMgr::ContentCache *>(CC)->IsTransient = true;
680 }
681 
682 StringRef SourceManager::getBufferData(FileID FID, bool *Invalid) const {
683  bool MyInvalid = false;
684  const SLocEntry &SLoc = getSLocEntry(FID, &MyInvalid);
685  if (!SLoc.isFile() || MyInvalid) {
686  if (Invalid)
687  *Invalid = true;
688  return "<<<<<INVALID SOURCE LOCATION>>>>>";
689  }
690 
691  llvm::MemoryBuffer *Buf = SLoc.getFile().getContentCache()->getBuffer(
692  Diag, *this, SourceLocation(), &MyInvalid);
693  if (Invalid)
694  *Invalid = MyInvalid;
695 
696  if (MyInvalid)
697  return "<<<<<INVALID SOURCE LOCATION>>>>>";
698 
699  return Buf->getBuffer();
700 }
701 
702 //===----------------------------------------------------------------------===//
703 // SourceLocation manipulation methods.
704 //===----------------------------------------------------------------------===//
705 
706 /// \brief Return the FileID for a SourceLocation.
707 ///
708 /// This is the cache-miss path of getFileID. Not as hot as that function, but
709 /// still very important. It is responsible for finding the entry in the
710 /// SLocEntry tables that contains the specified location.
711 FileID SourceManager::getFileIDSlow(unsigned SLocOffset) const {
712  if (!SLocOffset)
713  return FileID::get(0);
714 
715  // Now it is time to search for the correct file. See where the SLocOffset
716  // sits in the global view and consult local or loaded buffers for it.
717  if (SLocOffset < NextLocalOffset)
718  return getFileIDLocal(SLocOffset);
719  return getFileIDLoaded(SLocOffset);
720 }
721 
722 /// \brief Return the FileID for a SourceLocation with a low offset.
723 ///
724 /// This function knows that the SourceLocation is in a local buffer, not a
725 /// loaded one.
726 FileID SourceManager::getFileIDLocal(unsigned SLocOffset) const {
727  assert(SLocOffset < NextLocalOffset && "Bad function choice");
728 
729  // After the first and second level caches, I see two common sorts of
730  // behavior: 1) a lot of searched FileID's are "near" the cached file
731  // location or are "near" the cached expansion location. 2) others are just
732  // completely random and may be a very long way away.
733  //
734  // To handle this, we do a linear search for up to 8 steps to catch #1 quickly
735  // then we fall back to a less cache efficient, but more scalable, binary
736  // search to find the location.
737 
738  // See if this is near the file point - worst case we start scanning from the
739  // most newly created FileID.
740  const SrcMgr::SLocEntry *I;
741 
742  if (LastFileIDLookup.ID < 0 ||
743  LocalSLocEntryTable[LastFileIDLookup.ID].getOffset() < SLocOffset) {
744  // Neither loc prunes our search.
745  I = LocalSLocEntryTable.end();
746  } else {
747  // Perhaps it is near the file point.
748  I = LocalSLocEntryTable.begin()+LastFileIDLookup.ID;
749  }
750 
751  // Find the FileID that contains this. "I" is an iterator that points to a
752  // FileID whose offset is known to be larger than SLocOffset.
753  unsigned NumProbes = 0;
754  while (1) {
755  --I;
756  if (I->getOffset() <= SLocOffset) {
757  FileID Res = FileID::get(int(I - LocalSLocEntryTable.begin()));
758 
759  // If this isn't an expansion, remember it. We have good locality across
760  // FileID lookups.
761  if (!I->isExpansion())
762  LastFileIDLookup = Res;
763  NumLinearScans += NumProbes+1;
764  return Res;
765  }
766  if (++NumProbes == 8)
767  break;
768  }
769 
770  // Convert "I" back into an index. We know that it is an entry whose index is
771  // larger than the offset we are looking for.
772  unsigned GreaterIndex = I - LocalSLocEntryTable.begin();
773  // LessIndex - This is the lower bound of the range that we're searching.
774  // We know that the offset corresponding to the FileID is is less than
775  // SLocOffset.
776  unsigned LessIndex = 0;
777  NumProbes = 0;
778  while (1) {
779  bool Invalid = false;
780  unsigned MiddleIndex = (GreaterIndex-LessIndex)/2+LessIndex;
781  unsigned MidOffset = getLocalSLocEntry(MiddleIndex, &Invalid).getOffset();
782  if (Invalid)
783  return FileID::get(0);
784 
785  ++NumProbes;
786 
787  // If the offset of the midpoint is too large, chop the high side of the
788  // range to the midpoint.
789  if (MidOffset > SLocOffset) {
790  GreaterIndex = MiddleIndex;
791  continue;
792  }
793 
794  // If the middle index contains the value, succeed and return.
795  // FIXME: This could be made faster by using a function that's aware of
796  // being in the local area.
797  if (isOffsetInFileID(FileID::get(MiddleIndex), SLocOffset)) {
798  FileID Res = FileID::get(MiddleIndex);
799 
800  // If this isn't a macro expansion, remember it. We have good locality
801  // across FileID lookups.
802  if (!LocalSLocEntryTable[MiddleIndex].isExpansion())
803  LastFileIDLookup = Res;
804  NumBinaryProbes += NumProbes;
805  return Res;
806  }
807 
808  // Otherwise, move the low-side up to the middle index.
809  LessIndex = MiddleIndex;
810  }
811 }
812 
813 /// \brief Return the FileID for a SourceLocation with a high offset.
814 ///
815 /// This function knows that the SourceLocation is in a loaded buffer, not a
816 /// local one.
817 FileID SourceManager::getFileIDLoaded(unsigned SLocOffset) const {
818  // Sanity checking, otherwise a bug may lead to hanging in release build.
819  if (SLocOffset < CurrentLoadedOffset) {
820  assert(0 && "Invalid SLocOffset or bad function choice");
821  return FileID();
822  }
823 
824  // Essentially the same as the local case, but the loaded array is sorted
825  // in the other direction.
826 
827  // First do a linear scan from the last lookup position, if possible.
828  unsigned I;
829  int LastID = LastFileIDLookup.ID;
830  if (LastID >= 0 || getLoadedSLocEntryByID(LastID).getOffset() < SLocOffset)
831  I = 0;
832  else
833  I = (-LastID - 2) + 1;
834 
835  unsigned NumProbes;
836  for (NumProbes = 0; NumProbes < 8; ++NumProbes, ++I) {
837  // Make sure the entry is loaded!
839  if (E.getOffset() <= SLocOffset) {
840  FileID Res = FileID::get(-int(I) - 2);
841 
842  if (!E.isExpansion())
843  LastFileIDLookup = Res;
844  NumLinearScans += NumProbes + 1;
845  return Res;
846  }
847  }
848 
849  // Linear scan failed. Do the binary search. Note the reverse sorting of the
850  // table: GreaterIndex is the one where the offset is greater, which is
851  // actually a lower index!
852  unsigned GreaterIndex = I;
853  unsigned LessIndex = LoadedSLocEntryTable.size();
854  NumProbes = 0;
855  while (1) {
856  ++NumProbes;
857  unsigned MiddleIndex = (LessIndex - GreaterIndex) / 2 + GreaterIndex;
858  const SrcMgr::SLocEntry &E = getLoadedSLocEntry(MiddleIndex);
859  if (E.getOffset() == 0)
860  return FileID(); // invalid entry.
861 
862  ++NumProbes;
863 
864  if (E.getOffset() > SLocOffset) {
865  // Sanity checking, otherwise a bug may lead to hanging in release build.
866  if (GreaterIndex == MiddleIndex) {
867  assert(0 && "binary search missed the entry");
868  return FileID();
869  }
870  GreaterIndex = MiddleIndex;
871  continue;
872  }
873 
874  if (isOffsetInFileID(FileID::get(-int(MiddleIndex) - 2), SLocOffset)) {
875  FileID Res = FileID::get(-int(MiddleIndex) - 2);
876  if (!E.isExpansion())
877  LastFileIDLookup = Res;
878  NumBinaryProbes += NumProbes;
879  return Res;
880  }
881 
882  // Sanity checking, otherwise a bug may lead to hanging in release build.
883  if (LessIndex == MiddleIndex) {
884  assert(0 && "binary search missed the entry");
885  return FileID();
886  }
887  LessIndex = MiddleIndex;
888  }
889 }
890 
891 SourceLocation SourceManager::
892 getExpansionLocSlowCase(SourceLocation Loc) const {
893  do {
894  // Note: If Loc indicates an offset into a token that came from a macro
895  // expansion (e.g. the 5th character of the token) we do not want to add
896  // this offset when going to the expansion location. The expansion
897  // location is the macro invocation, which the offset has nothing to do
898  // with. This is unlike when we get the spelling loc, because the offset
899  // directly correspond to the token whose spelling we're inspecting.
901  } while (!Loc.isFileID());
902 
903  return Loc;
904 }
905 
906 SourceLocation SourceManager::getSpellingLocSlowCase(SourceLocation Loc) const {
907  do {
908  std::pair<FileID, unsigned> LocInfo = getDecomposedLoc(Loc);
909  Loc = getSLocEntry(LocInfo.first).getExpansion().getSpellingLoc();
910  Loc = Loc.getLocWithOffset(LocInfo.second);
911  } while (!Loc.isFileID());
912  return Loc;
913 }
914 
915 SourceLocation SourceManager::getFileLocSlowCase(SourceLocation Loc) const {
916  do {
917  if (isMacroArgExpansion(Loc))
918  Loc = getImmediateSpellingLoc(Loc);
919  else
920  Loc = getImmediateExpansionRange(Loc).first;
921  } while (!Loc.isFileID());
922  return Loc;
923 }
924 
925 
926 std::pair<FileID, unsigned>
927 SourceManager::getDecomposedExpansionLocSlowCase(
928  const SrcMgr::SLocEntry *E) const {
929  // If this is an expansion record, walk through all the expansion points.
930  FileID FID;
931  SourceLocation Loc;
932  unsigned Offset;
933  do {
934  Loc = E->getExpansion().getExpansionLocStart();
935 
936  FID = getFileID(Loc);
937  E = &getSLocEntry(FID);
938  Offset = Loc.getOffset()-E->getOffset();
939  } while (!Loc.isFileID());
940 
941  return std::make_pair(FID, Offset);
942 }
943 
944 std::pair<FileID, unsigned>
945 SourceManager::getDecomposedSpellingLocSlowCase(const SrcMgr::SLocEntry *E,
946  unsigned Offset) const {
947  // If this is an expansion record, walk through all the expansion points.
948  FileID FID;
949  SourceLocation Loc;
950  do {
951  Loc = E->getExpansion().getSpellingLoc();
952  Loc = Loc.getLocWithOffset(Offset);
953 
954  FID = getFileID(Loc);
955  E = &getSLocEntry(FID);
956  Offset = Loc.getOffset()-E->getOffset();
957  } while (!Loc.isFileID());
958 
959  return std::make_pair(FID, Offset);
960 }
961 
962 /// getImmediateSpellingLoc - Given a SourceLocation object, return the
963 /// spelling location referenced by the ID. This is the first level down
964 /// towards the place where the characters that make up the lexed token can be
965 /// found. This should not generally be used by clients.
967  if (Loc.isFileID()) return Loc;
968  std::pair<FileID, unsigned> LocInfo = getDecomposedLoc(Loc);
969  Loc = getSLocEntry(LocInfo.first).getExpansion().getSpellingLoc();
970  return Loc.getLocWithOffset(LocInfo.second);
971 }
972 
973 
974 /// getImmediateExpansionRange - Loc is required to be an expansion location.
975 /// Return the start/end of the expansion information.
976 std::pair<SourceLocation,SourceLocation>
978  assert(Loc.isMacroID() && "Not a macro expansion loc!");
979  const ExpansionInfo &Expansion = getSLocEntry(getFileID(Loc)).getExpansion();
980  return Expansion.getExpansionLocRange();
981 }
982 
983 /// getExpansionRange - Given a SourceLocation object, return the range of
984 /// tokens covered by the expansion in the ultimate file.
985 std::pair<SourceLocation,SourceLocation>
987  if (Loc.isFileID()) return std::make_pair(Loc, Loc);
988 
989  std::pair<SourceLocation,SourceLocation> Res =
991 
992  // Fully resolve the start and end locations to their ultimate expansion
993  // points.
994  while (!Res.first.isFileID())
995  Res.first = getImmediateExpansionRange(Res.first).first;
996  while (!Res.second.isFileID())
997  Res.second = getImmediateExpansionRange(Res.second).second;
998  return Res;
999 }
1000 
1002  SourceLocation *StartLoc) const {
1003  if (!Loc.isMacroID()) return false;
1004 
1005  FileID FID = getFileID(Loc);
1006  const SrcMgr::ExpansionInfo &Expansion = getSLocEntry(FID).getExpansion();
1007  if (!Expansion.isMacroArgExpansion()) return false;
1008 
1009  if (StartLoc)
1010  *StartLoc = Expansion.getExpansionLocStart();
1011  return true;
1012 }
1013 
1015  if (!Loc.isMacroID()) return false;
1016 
1017  FileID FID = getFileID(Loc);
1018  const SrcMgr::ExpansionInfo &Expansion = getSLocEntry(FID).getExpansion();
1019  return Expansion.isMacroBodyExpansion();
1020 }
1021 
1023  SourceLocation *MacroBegin) const {
1024  assert(Loc.isValid() && Loc.isMacroID() && "Expected a valid macro loc");
1025 
1026  std::pair<FileID, unsigned> DecompLoc = getDecomposedLoc(Loc);
1027  if (DecompLoc.second > 0)
1028  return false; // Does not point at the start of expansion range.
1029 
1030  bool Invalid = false;
1031  const SrcMgr::ExpansionInfo &ExpInfo =
1032  getSLocEntry(DecompLoc.first, &Invalid).getExpansion();
1033  if (Invalid)
1034  return false;
1035  SourceLocation ExpLoc = ExpInfo.getExpansionLocStart();
1036 
1037  if (ExpInfo.isMacroArgExpansion()) {
1038  // For macro argument expansions, check if the previous FileID is part of
1039  // the same argument expansion, in which case this Loc is not at the
1040  // beginning of the expansion.
1041  FileID PrevFID = getPreviousFileID(DecompLoc.first);
1042  if (!PrevFID.isInvalid()) {
1043  const SrcMgr::SLocEntry &PrevEntry = getSLocEntry(PrevFID, &Invalid);
1044  if (Invalid)
1045  return false;
1046  if (PrevEntry.isExpansion() &&
1047  PrevEntry.getExpansion().getExpansionLocStart() == ExpLoc)
1048  return false;
1049  }
1050  }
1051 
1052  if (MacroBegin)
1053  *MacroBegin = ExpLoc;
1054  return true;
1055 }
1056 
1058  SourceLocation *MacroEnd) const {
1059  assert(Loc.isValid() && Loc.isMacroID() && "Expected a valid macro loc");
1060 
1061  FileID FID = getFileID(Loc);
1062  SourceLocation NextLoc = Loc.getLocWithOffset(1);
1063  if (isInFileID(NextLoc, FID))
1064  return false; // Does not point at the end of expansion range.
1065 
1066  bool Invalid = false;
1067  const SrcMgr::ExpansionInfo &ExpInfo =
1068  getSLocEntry(FID, &Invalid).getExpansion();
1069  if (Invalid)
1070  return false;
1071 
1072  if (ExpInfo.isMacroArgExpansion()) {
1073  // For macro argument expansions, check if the next FileID is part of the
1074  // same argument expansion, in which case this Loc is not at the end of the
1075  // expansion.
1076  FileID NextFID = getNextFileID(FID);
1077  if (!NextFID.isInvalid()) {
1078  const SrcMgr::SLocEntry &NextEntry = getSLocEntry(NextFID, &Invalid);
1079  if (Invalid)
1080  return false;
1081  if (NextEntry.isExpansion() &&
1082  NextEntry.getExpansion().getExpansionLocStart() ==
1083  ExpInfo.getExpansionLocStart())
1084  return false;
1085  }
1086  }
1087 
1088  if (MacroEnd)
1089  *MacroEnd = ExpInfo.getExpansionLocEnd();
1090  return true;
1091 }
1092 
1093 
1094 //===----------------------------------------------------------------------===//
1095 // Queries about the code at a SourceLocation.
1096 //===----------------------------------------------------------------------===//
1097 
1098 /// getCharacterData - Return a pointer to the start of the specified location
1099 /// in the appropriate MemoryBuffer.
1101  bool *Invalid) const {
1102  // Note that this is a hot function in the getSpelling() path, which is
1103  // heavily used by -E mode.
1104  std::pair<FileID, unsigned> LocInfo = getDecomposedSpellingLoc(SL);
1105 
1106  // Note that calling 'getBuffer()' may lazily page in a source file.
1107  bool CharDataInvalid = false;
1108  const SLocEntry &Entry = getSLocEntry(LocInfo.first, &CharDataInvalid);
1109  if (CharDataInvalid || !Entry.isFile()) {
1110  if (Invalid)
1111  *Invalid = true;
1112 
1113  return "<<<<INVALID BUFFER>>>>";
1114  }
1115  llvm::MemoryBuffer *Buffer = Entry.getFile().getContentCache()->getBuffer(
1116  Diag, *this, SourceLocation(), &CharDataInvalid);
1117  if (Invalid)
1118  *Invalid = CharDataInvalid;
1119  return Buffer->getBufferStart() + (CharDataInvalid? 0 : LocInfo.second);
1120 }
1121 
1122 
1123 /// getColumnNumber - Return the column # for the specified file position.
1124 /// this is significantly cheaper to compute than the line number.
1125 unsigned SourceManager::getColumnNumber(FileID FID, unsigned FilePos,
1126  bool *Invalid) const {
1127  bool MyInvalid = false;
1128  llvm::MemoryBuffer *MemBuf = getBuffer(FID, &MyInvalid);
1129  if (Invalid)
1130  *Invalid = MyInvalid;
1131 
1132  if (MyInvalid)
1133  return 1;
1134 
1135  // It is okay to request a position just past the end of the buffer.
1136  if (FilePos > MemBuf->getBufferSize()) {
1137  if (Invalid)
1138  *Invalid = true;
1139  return 1;
1140  }
1141 
1142  // See if we just calculated the line number for this FilePos and can use
1143  // that to lookup the start of the line instead of searching for it.
1144  if (LastLineNoFileIDQuery == FID &&
1145  LastLineNoContentCache->SourceLineCache != nullptr &&
1146  LastLineNoResult < LastLineNoContentCache->NumLines) {
1147  unsigned *SourceLineCache = LastLineNoContentCache->SourceLineCache;
1148  unsigned LineStart = SourceLineCache[LastLineNoResult - 1];
1149  unsigned LineEnd = SourceLineCache[LastLineNoResult];
1150  if (FilePos >= LineStart && FilePos < LineEnd)
1151  return FilePos - LineStart + 1;
1152  }
1153 
1154  const char *Buf = MemBuf->getBufferStart();
1155  unsigned LineStart = FilePos;
1156  while (LineStart && Buf[LineStart-1] != '\n' && Buf[LineStart-1] != '\r')
1157  --LineStart;
1158  return FilePos-LineStart+1;
1159 }
1160 
1161 // isInvalid - Return the result of calling loc.isInvalid(), and
1162 // if Invalid is not null, set its value to same.
1163 static bool isInvalid(SourceLocation Loc, bool *Invalid) {
1164  bool MyInvalid = Loc.isInvalid();
1165  if (Invalid)
1166  *Invalid = MyInvalid;
1167  return MyInvalid;
1168 }
1169 
1171  bool *Invalid) const {
1172  if (isInvalid(Loc, Invalid)) return 0;
1173  std::pair<FileID, unsigned> LocInfo = getDecomposedSpellingLoc(Loc);
1174  return getColumnNumber(LocInfo.first, LocInfo.second, Invalid);
1175 }
1176 
1178  bool *Invalid) const {
1179  if (isInvalid(Loc, Invalid)) return 0;
1180  std::pair<FileID, unsigned> LocInfo = getDecomposedExpansionLoc(Loc);
1181  return getColumnNumber(LocInfo.first, LocInfo.second, Invalid);
1182 }
1183 
1185  bool *Invalid) const {
1186  if (isInvalid(Loc, Invalid)) return 0;
1187  return getPresumedLoc(Loc).getColumn();
1188 }
1189 
1190 #ifdef __SSE2__
1191 #include <emmintrin.h>
1192 #endif
1193 
1194 static LLVM_ATTRIBUTE_NOINLINE void
1195 ComputeLineNumbers(DiagnosticsEngine &Diag, ContentCache *FI,
1196  llvm::BumpPtrAllocator &Alloc,
1197  const SourceManager &SM, bool &Invalid);
1198 static void ComputeLineNumbers(DiagnosticsEngine &Diag, ContentCache *FI,
1199  llvm::BumpPtrAllocator &Alloc,
1200  const SourceManager &SM, bool &Invalid) {
1201  // Note that calling 'getBuffer()' may lazily page in the file.
1202  MemoryBuffer *Buffer = FI->getBuffer(Diag, SM, SourceLocation(), &Invalid);
1203  if (Invalid)
1204  return;
1205 
1206  // Find the file offsets of all of the *physical* source lines. This does
1207  // not look at trigraphs, escaped newlines, or anything else tricky.
1208  SmallVector<unsigned, 256> LineOffsets;
1209 
1210  // Line #1 starts at char 0.
1211  LineOffsets.push_back(0);
1212 
1213  const unsigned char *Buf = (const unsigned char *)Buffer->getBufferStart();
1214  const unsigned char *End = (const unsigned char *)Buffer->getBufferEnd();
1215  unsigned Offs = 0;
1216  while (1) {
1217  // Skip over the contents of the line.
1218  const unsigned char *NextBuf = (const unsigned char *)Buf;
1219 
1220 #ifdef __SSE2__
1221  // Try to skip to the next newline using SSE instructions. This is very
1222  // performance sensitive for programs with lots of diagnostics and in -E
1223  // mode.
1224  __m128i CRs = _mm_set1_epi8('\r');
1225  __m128i LFs = _mm_set1_epi8('\n');
1226 
1227  // First fix up the alignment to 16 bytes.
1228  while (((uintptr_t)NextBuf & 0xF) != 0) {
1229  if (*NextBuf == '\n' || *NextBuf == '\r' || *NextBuf == '\0')
1230  goto FoundSpecialChar;
1231  ++NextBuf;
1232  }
1233 
1234  // Scan 16 byte chunks for '\r' and '\n'. Ignore '\0'.
1235  while (NextBuf+16 <= End) {
1236  const __m128i Chunk = *(const __m128i*)NextBuf;
1237  __m128i Cmp = _mm_or_si128(_mm_cmpeq_epi8(Chunk, CRs),
1238  _mm_cmpeq_epi8(Chunk, LFs));
1239  unsigned Mask = _mm_movemask_epi8(Cmp);
1240 
1241  // If we found a newline, adjust the pointer and jump to the handling code.
1242  if (Mask != 0) {
1243  NextBuf += llvm::countTrailingZeros(Mask);
1244  goto FoundSpecialChar;
1245  }
1246  NextBuf += 16;
1247  }
1248 #endif
1249 
1250  while (*NextBuf != '\n' && *NextBuf != '\r' && *NextBuf != '\0')
1251  ++NextBuf;
1252 
1253 #ifdef __SSE2__
1254 FoundSpecialChar:
1255 #endif
1256  Offs += NextBuf-Buf;
1257  Buf = NextBuf;
1258 
1259  if (Buf[0] == '\n' || Buf[0] == '\r') {
1260  // If this is \n\r or \r\n, skip both characters.
1261  if ((Buf[1] == '\n' || Buf[1] == '\r') && Buf[0] != Buf[1])
1262  ++Offs, ++Buf;
1263  ++Offs, ++Buf;
1264  LineOffsets.push_back(Offs);
1265  } else {
1266  // Otherwise, this is a null. If end of file, exit.
1267  if (Buf == End) break;
1268  // Otherwise, skip the null.
1269  ++Offs, ++Buf;
1270  }
1271  }
1272 
1273  // Copy the offsets into the FileInfo structure.
1274  FI->NumLines = LineOffsets.size();
1275  FI->SourceLineCache = Alloc.Allocate<unsigned>(LineOffsets.size());
1276  std::copy(LineOffsets.begin(), LineOffsets.end(), FI->SourceLineCache);
1277 }
1278 
1279 /// getLineNumber - Given a SourceLocation, return the spelling line number
1280 /// for the position indicated. This requires building and caching a table of
1281 /// line offsets for the MemoryBuffer, so this is not cheap: use only when
1282 /// about to emit a diagnostic.
1283 unsigned SourceManager::getLineNumber(FileID FID, unsigned FilePos,
1284  bool *Invalid) const {
1285  if (FID.isInvalid()) {
1286  if (Invalid)
1287  *Invalid = true;
1288  return 1;
1289  }
1290 
1291  ContentCache *Content;
1292  if (LastLineNoFileIDQuery == FID)
1293  Content = LastLineNoContentCache;
1294  else {
1295  bool MyInvalid = false;
1296  const SLocEntry &Entry = getSLocEntry(FID, &MyInvalid);
1297  if (MyInvalid || !Entry.isFile()) {
1298  if (Invalid)
1299  *Invalid = true;
1300  return 1;
1301  }
1302 
1303  Content = const_cast<ContentCache*>(Entry.getFile().getContentCache());
1304  }
1305 
1306  // If this is the first use of line information for this buffer, compute the
1307  /// SourceLineCache for it on demand.
1308  if (!Content->SourceLineCache) {
1309  bool MyInvalid = false;
1310  ComputeLineNumbers(Diag, Content, ContentCacheAlloc, *this, MyInvalid);
1311  if (Invalid)
1312  *Invalid = MyInvalid;
1313  if (MyInvalid)
1314  return 1;
1315  } else if (Invalid)
1316  *Invalid = false;
1317 
1318  // Okay, we know we have a line number table. Do a binary search to find the
1319  // line number that this character position lands on.
1320  unsigned *SourceLineCache = Content->SourceLineCache;
1321  unsigned *SourceLineCacheStart = SourceLineCache;
1322  unsigned *SourceLineCacheEnd = SourceLineCache + Content->NumLines;
1323 
1324  unsigned QueriedFilePos = FilePos+1;
1325 
1326  // FIXME: I would like to be convinced that this code is worth being as
1327  // complicated as it is, binary search isn't that slow.
1328  //
1329  // If it is worth being optimized, then in my opinion it could be more
1330  // performant, simpler, and more obviously correct by just "galloping" outward
1331  // from the queried file position. In fact, this could be incorporated into a
1332  // generic algorithm such as lower_bound_with_hint.
1333  //
1334  // If someone gives me a test case where this matters, and I will do it! - DWD
1335 
1336  // If the previous query was to the same file, we know both the file pos from
1337  // that query and the line number returned. This allows us to narrow the
1338  // search space from the entire file to something near the match.
1339  if (LastLineNoFileIDQuery == FID) {
1340  if (QueriedFilePos >= LastLineNoFilePos) {
1341  // FIXME: Potential overflow?
1342  SourceLineCache = SourceLineCache+LastLineNoResult-1;
1343 
1344  // The query is likely to be nearby the previous one. Here we check to
1345  // see if it is within 5, 10 or 20 lines. It can be far away in cases
1346  // where big comment blocks and vertical whitespace eat up lines but
1347  // contribute no tokens.
1348  if (SourceLineCache+5 < SourceLineCacheEnd) {
1349  if (SourceLineCache[5] > QueriedFilePos)
1350  SourceLineCacheEnd = SourceLineCache+5;
1351  else if (SourceLineCache+10 < SourceLineCacheEnd) {
1352  if (SourceLineCache[10] > QueriedFilePos)
1353  SourceLineCacheEnd = SourceLineCache+10;
1354  else if (SourceLineCache+20 < SourceLineCacheEnd) {
1355  if (SourceLineCache[20] > QueriedFilePos)
1356  SourceLineCacheEnd = SourceLineCache+20;
1357  }
1358  }
1359  }
1360  } else {
1361  if (LastLineNoResult < Content->NumLines)
1362  SourceLineCacheEnd = SourceLineCache+LastLineNoResult+1;
1363  }
1364  }
1365 
1366  unsigned *Pos
1367  = std::lower_bound(SourceLineCache, SourceLineCacheEnd, QueriedFilePos);
1368  unsigned LineNo = Pos-SourceLineCacheStart;
1369 
1370  LastLineNoFileIDQuery = FID;
1371  LastLineNoContentCache = Content;
1372  LastLineNoFilePos = QueriedFilePos;
1373  LastLineNoResult = LineNo;
1374  return LineNo;
1375 }
1376 
1378  bool *Invalid) const {
1379  if (isInvalid(Loc, Invalid)) return 0;
1380  std::pair<FileID, unsigned> LocInfo = getDecomposedSpellingLoc(Loc);
1381  return getLineNumber(LocInfo.first, LocInfo.second);
1382 }
1384  bool *Invalid) const {
1385  if (isInvalid(Loc, Invalid)) return 0;
1386  std::pair<FileID, unsigned> LocInfo = getDecomposedExpansionLoc(Loc);
1387  return getLineNumber(LocInfo.first, LocInfo.second);
1388 }
1390  bool *Invalid) const {
1391  if (isInvalid(Loc, Invalid)) return 0;
1392  return getPresumedLoc(Loc).getLine();
1393 }
1394 
1395 /// getFileCharacteristic - return the file characteristic of the specified
1396 /// source location, indicating whether this is a normal file, a system
1397 /// header, or an "implicit extern C" system header.
1398 ///
1399 /// This state can be modified with flags on GNU linemarker directives like:
1400 /// # 4 "foo.h" 3
1401 /// which changes all source locations in the current file after that to be
1402 /// considered to be from a system header.
1405  assert(Loc.isValid() && "Can't get file characteristic of invalid loc!");
1406  std::pair<FileID, unsigned> LocInfo = getDecomposedExpansionLoc(Loc);
1407  bool Invalid = false;
1408  const SLocEntry &SEntry = getSLocEntry(LocInfo.first, &Invalid);
1409  if (Invalid || !SEntry.isFile())
1410  return C_User;
1411 
1412  const SrcMgr::FileInfo &FI = SEntry.getFile();
1413 
1414  // If there are no #line directives in this file, just return the whole-file
1415  // state.
1416  if (!FI.hasLineDirectives())
1417  return FI.getFileCharacteristic();
1418 
1419  assert(LineTable && "Can't have linetable entries without a LineTable!");
1420  // See if there is a #line directive before the location.
1421  const LineEntry *Entry =
1422  LineTable->FindNearestLineEntry(LocInfo.first, LocInfo.second);
1423 
1424  // If this is before the first line marker, use the file characteristic.
1425  if (!Entry)
1426  return FI.getFileCharacteristic();
1427 
1428  return Entry->FileKind;
1429 }
1430 
1431 /// Return the filename or buffer identifier of the buffer the location is in.
1432 /// Note that this name does not respect \#line directives. Use getPresumedLoc
1433 /// for normal clients.
1435  bool *Invalid) const {
1436  if (isInvalid(Loc, Invalid)) return "<invalid loc>";
1437 
1438  return getBuffer(getFileID(Loc), Invalid)->getBufferIdentifier();
1439 }
1440 
1441 
1442 /// getPresumedLoc - This method returns the "presumed" location of a
1443 /// SourceLocation specifies. A "presumed location" can be modified by \#line
1444 /// or GNU line marker directives. This provides a view on the data that a
1445 /// user should see in diagnostics, for example.
1446 ///
1447 /// Note that a presumed location is always given as the expansion point of an
1448 /// expansion location, not at the spelling location.
1450  bool UseLineDirectives) const {
1451  if (Loc.isInvalid()) return PresumedLoc();
1452 
1453  // Presumed locations are always for expansion points.
1454  std::pair<FileID, unsigned> LocInfo = getDecomposedExpansionLoc(Loc);
1455 
1456  bool Invalid = false;
1457  const SLocEntry &Entry = getSLocEntry(LocInfo.first, &Invalid);
1458  if (Invalid || !Entry.isFile())
1459  return PresumedLoc();
1460 
1461  const SrcMgr::FileInfo &FI = Entry.getFile();
1462  const SrcMgr::ContentCache *C = FI.getContentCache();
1463 
1464  // To get the source name, first consult the FileEntry (if one exists)
1465  // before the MemBuffer as this will avoid unnecessarily paging in the
1466  // MemBuffer.
1467  const char *Filename;
1468  if (C->OrigEntry)
1469  Filename = C->OrigEntry->getName();
1470  else
1471  Filename = C->getBuffer(Diag, *this)->getBufferIdentifier();
1472 
1473  unsigned LineNo = getLineNumber(LocInfo.first, LocInfo.second, &Invalid);
1474  if (Invalid)
1475  return PresumedLoc();
1476  unsigned ColNo = getColumnNumber(LocInfo.first, LocInfo.second, &Invalid);
1477  if (Invalid)
1478  return PresumedLoc();
1479 
1480  SourceLocation IncludeLoc = FI.getIncludeLoc();
1481 
1482  // If we have #line directives in this file, update and overwrite the physical
1483  // location info if appropriate.
1484  if (UseLineDirectives && FI.hasLineDirectives()) {
1485  assert(LineTable && "Can't have linetable entries without a LineTable!");
1486  // See if there is a #line directive before this. If so, get it.
1487  if (const LineEntry *Entry =
1488  LineTable->FindNearestLineEntry(LocInfo.first, LocInfo.second)) {
1489  // If the LineEntry indicates a filename, use it.
1490  if (Entry->FilenameID != -1)
1491  Filename = LineTable->getFilename(Entry->FilenameID);
1492 
1493  // Use the line number specified by the LineEntry. This line number may
1494  // be multiple lines down from the line entry. Add the difference in
1495  // physical line numbers from the query point and the line marker to the
1496  // total.
1497  unsigned MarkerLineNo = getLineNumber(LocInfo.first, Entry->FileOffset);
1498  LineNo = Entry->LineNo + (LineNo-MarkerLineNo-1);
1499 
1500  // Note that column numbers are not molested by line markers.
1501 
1502  // Handle virtual #include manipulation.
1503  if (Entry->IncludeOffset) {
1504  IncludeLoc = getLocForStartOfFile(LocInfo.first);
1505  IncludeLoc = IncludeLoc.getLocWithOffset(Entry->IncludeOffset);
1506  }
1507  }
1508  }
1509 
1510  return PresumedLoc(Filename, LineNo, ColNo, IncludeLoc);
1511 }
1512 
1513 /// \brief Returns whether the PresumedLoc for a given SourceLocation is
1514 /// in the main file.
1515 ///
1516 /// This computes the "presumed" location for a SourceLocation, then checks
1517 /// whether it came from a file other than the main file. This is different
1518 /// from isWrittenInMainFile() because it takes line marker directives into
1519 /// account.
1521  if (Loc.isInvalid()) return false;
1522 
1523  // Presumed locations are always for expansion points.
1524  std::pair<FileID, unsigned> LocInfo = getDecomposedExpansionLoc(Loc);
1525 
1526  bool Invalid = false;
1527  const SLocEntry &Entry = getSLocEntry(LocInfo.first, &Invalid);
1528  if (Invalid || !Entry.isFile())
1529  return false;
1530 
1531  const SrcMgr::FileInfo &FI = Entry.getFile();
1532 
1533  // Check if there is a line directive for this location.
1534  if (FI.hasLineDirectives())
1535  if (const LineEntry *Entry =
1536  LineTable->FindNearestLineEntry(LocInfo.first, LocInfo.second))
1537  if (Entry->IncludeOffset)
1538  return false;
1539 
1540  return FI.getIncludeLoc().isInvalid();
1541 }
1542 
1543 /// \brief The size of the SLocEntry that \p FID represents.
1545  bool Invalid = false;
1546  const SrcMgr::SLocEntry &Entry = getSLocEntry(FID, &Invalid);
1547  if (Invalid)
1548  return 0;
1549 
1550  int ID = FID.ID;
1551  unsigned NextOffset;
1552  if ((ID > 0 && unsigned(ID+1) == local_sloc_entry_size()))
1553  NextOffset = getNextLocalOffset();
1554  else if (ID+1 == -1)
1555  NextOffset = MaxLoadedOffset;
1556  else
1557  NextOffset = getSLocEntry(FileID::get(ID+1)).getOffset();
1558 
1559  return NextOffset - Entry.getOffset() - 1;
1560 }
1561 
1562 //===----------------------------------------------------------------------===//
1563 // Other miscellaneous methods.
1564 //===----------------------------------------------------------------------===//
1565 
1566 /// \brief Retrieve the inode for the given file entry, if possible.
1567 ///
1568 /// This routine involves a system call, and therefore should only be used
1569 /// in non-performance-critical code.
1572  if (!File)
1573  return None;
1574 
1575  llvm::sys::fs::UniqueID ID;
1576  if (llvm::sys::fs::getUniqueID(File->getName(), ID))
1577  return None;
1578 
1579  return ID;
1580 }
1581 
1582 /// \brief Get the source location for the given file:line:col triplet.
1583 ///
1584 /// If the source file is included multiple times, the source location will
1585 /// be based upon an arbitrary inclusion.
1587  unsigned Line,
1588  unsigned Col) const {
1589  assert(SourceFile && "Null source file!");
1590  assert(Line && Col && "Line and column should start from 1!");
1591 
1592  FileID FirstFID = translateFile(SourceFile);
1593  return translateLineCol(FirstFID, Line, Col);
1594 }
1595 
1596 /// \brief Get the FileID for the given file.
1597 ///
1598 /// If the source file is included multiple times, the FileID will be the
1599 /// first inclusion.
1601  assert(SourceFile && "Null source file!");
1602 
1603  // Find the first file ID that corresponds to the given file.
1604  FileID FirstFID;
1605 
1606  // First, check the main file ID, since it is common to look for a
1607  // location in the main file.
1608  Optional<llvm::sys::fs::UniqueID> SourceFileUID;
1609  Optional<StringRef> SourceFileName;
1610  if (MainFileID.isValid()) {
1611  bool Invalid = false;
1612  const SLocEntry &MainSLoc = getSLocEntry(MainFileID, &Invalid);
1613  if (Invalid)
1614  return FileID();
1615 
1616  if (MainSLoc.isFile()) {
1617  const ContentCache *MainContentCache
1618  = MainSLoc.getFile().getContentCache();
1619  if (!MainContentCache) {
1620  // Can't do anything
1621  } else if (MainContentCache->OrigEntry == SourceFile) {
1622  FirstFID = MainFileID;
1623  } else {
1624  // Fall back: check whether we have the same base name and inode
1625  // as the main file.
1626  const FileEntry *MainFile = MainContentCache->OrigEntry;
1627  SourceFileName = llvm::sys::path::filename(SourceFile->getName());
1628  if (*SourceFileName == llvm::sys::path::filename(MainFile->getName())) {
1629  SourceFileUID = getActualFileUID(SourceFile);
1630  if (SourceFileUID) {
1631  if (Optional<llvm::sys::fs::UniqueID> MainFileUID =
1632  getActualFileUID(MainFile)) {
1633  if (*SourceFileUID == *MainFileUID) {
1634  FirstFID = MainFileID;
1635  SourceFile = MainFile;
1636  }
1637  }
1638  }
1639  }
1640  }
1641  }
1642  }
1643 
1644  if (FirstFID.isInvalid()) {
1645  // The location we're looking for isn't in the main file; look
1646  // through all of the local source locations.
1647  for (unsigned I = 0, N = local_sloc_entry_size(); I != N; ++I) {
1648  bool Invalid = false;
1649  const SLocEntry &SLoc = getLocalSLocEntry(I, &Invalid);
1650  if (Invalid)
1651  return FileID();
1652 
1653  if (SLoc.isFile() &&
1654  SLoc.getFile().getContentCache() &&
1655  SLoc.getFile().getContentCache()->OrigEntry == SourceFile) {
1656  FirstFID = FileID::get(I);
1657  break;
1658  }
1659  }
1660  // If that still didn't help, try the modules.
1661  if (FirstFID.isInvalid()) {
1662  for (unsigned I = 0, N = loaded_sloc_entry_size(); I != N; ++I) {
1663  const SLocEntry &SLoc = getLoadedSLocEntry(I);
1664  if (SLoc.isFile() &&
1665  SLoc.getFile().getContentCache() &&
1666  SLoc.getFile().getContentCache()->OrigEntry == SourceFile) {
1667  FirstFID = FileID::get(-int(I) - 2);
1668  break;
1669  }
1670  }
1671  }
1672  }
1673 
1674  // If we haven't found what we want yet, try again, but this time stat()
1675  // each of the files in case the files have changed since we originally
1676  // parsed the file.
1677  if (FirstFID.isInvalid() &&
1678  (SourceFileName ||
1679  (SourceFileName = llvm::sys::path::filename(SourceFile->getName()))) &&
1680  (SourceFileUID || (SourceFileUID = getActualFileUID(SourceFile)))) {
1681  bool Invalid = false;
1682  for (unsigned I = 0, N = local_sloc_entry_size(); I != N; ++I) {
1683  FileID IFileID;
1684  IFileID.ID = I;
1685  const SLocEntry &SLoc = getSLocEntry(IFileID, &Invalid);
1686  if (Invalid)
1687  return FileID();
1688 
1689  if (SLoc.isFile()) {
1690  const ContentCache *FileContentCache
1691  = SLoc.getFile().getContentCache();
1692  const FileEntry *Entry = FileContentCache ? FileContentCache->OrigEntry
1693  : nullptr;
1694  if (Entry &&
1695  *SourceFileName == llvm::sys::path::filename(Entry->getName())) {
1696  if (Optional<llvm::sys::fs::UniqueID> EntryUID =
1697  getActualFileUID(Entry)) {
1698  if (*SourceFileUID == *EntryUID) {
1699  FirstFID = FileID::get(I);
1700  SourceFile = Entry;
1701  break;
1702  }
1703  }
1704  }
1705  }
1706  }
1707  }
1708 
1709  (void) SourceFile;
1710  return FirstFID;
1711 }
1712 
1713 /// \brief Get the source location in \arg FID for the given line:col.
1714 /// Returns null location if \arg FID is not a file SLocEntry.
1716  unsigned Line,
1717  unsigned Col) const {
1718  // Lines are used as a one-based index into a zero-based array. This assert
1719  // checks for possible buffer underruns.
1720  assert(Line && Col && "Line and column should start from 1!");
1721 
1722  if (FID.isInvalid())
1723  return SourceLocation();
1724 
1725  bool Invalid = false;
1726  const SLocEntry &Entry = getSLocEntry(FID, &Invalid);
1727  if (Invalid)
1728  return SourceLocation();
1729 
1730  if (!Entry.isFile())
1731  return SourceLocation();
1732 
1733  SourceLocation FileLoc = SourceLocation::getFileLoc(Entry.getOffset());
1734 
1735  if (Line == 1 && Col == 1)
1736  return FileLoc;
1737 
1738  ContentCache *Content
1739  = const_cast<ContentCache *>(Entry.getFile().getContentCache());
1740  if (!Content)
1741  return SourceLocation();
1742 
1743  // If this is the first use of line information for this buffer, compute the
1744  // SourceLineCache for it on demand.
1745  if (!Content->SourceLineCache) {
1746  bool MyInvalid = false;
1747  ComputeLineNumbers(Diag, Content, ContentCacheAlloc, *this, MyInvalid);
1748  if (MyInvalid)
1749  return SourceLocation();
1750  }
1751 
1752  if (Line > Content->NumLines) {
1753  unsigned Size = Content->getBuffer(Diag, *this)->getBufferSize();
1754  if (Size > 0)
1755  --Size;
1756  return FileLoc.getLocWithOffset(Size);
1757  }
1758 
1759  llvm::MemoryBuffer *Buffer = Content->getBuffer(Diag, *this);
1760  unsigned FilePos = Content->SourceLineCache[Line - 1];
1761  const char *Buf = Buffer->getBufferStart() + FilePos;
1762  unsigned BufLength = Buffer->getBufferSize() - FilePos;
1763  if (BufLength == 0)
1764  return FileLoc.getLocWithOffset(FilePos);
1765 
1766  unsigned i = 0;
1767 
1768  // Check that the given column is valid.
1769  while (i < BufLength-1 && i < Col-1 && Buf[i] != '\n' && Buf[i] != '\r')
1770  ++i;
1771  return FileLoc.getLocWithOffset(FilePos + i);
1772 }
1773 
1774 /// \brief Compute a map of macro argument chunks to their expanded source
1775 /// location. Chunks that are not part of a macro argument will map to an
1776 /// invalid source location. e.g. if a file contains one macro argument at
1777 /// offset 100 with length 10, this is how the map will be formed:
1778 /// 0 -> SourceLocation()
1779 /// 100 -> Expanded macro arg location
1780 /// 110 -> SourceLocation()
1781 void SourceManager::computeMacroArgsCache(MacroArgsMap *&CachePtr,
1782  FileID FID) const {
1783  assert(FID.isValid());
1784  assert(!CachePtr);
1785 
1786  CachePtr = new MacroArgsMap();
1787  MacroArgsMap &MacroArgsCache = *CachePtr;
1788  // Initially no macro argument chunk is present.
1789  MacroArgsCache.insert(std::make_pair(0, SourceLocation()));
1790 
1791  int ID = FID.ID;
1792  while (1) {
1793  ++ID;
1794  // Stop if there are no more FileIDs to check.
1795  if (ID > 0) {
1796  if (unsigned(ID) >= local_sloc_entry_size())
1797  return;
1798  } else if (ID == -1) {
1799  return;
1800  }
1801 
1802  bool Invalid = false;
1803  const SrcMgr::SLocEntry &Entry = getSLocEntryByID(ID, &Invalid);
1804  if (Invalid)
1805  return;
1806  if (Entry.isFile()) {
1807  SourceLocation IncludeLoc = Entry.getFile().getIncludeLoc();
1808  if (IncludeLoc.isInvalid())
1809  continue;
1810  if (!isInFileID(IncludeLoc, FID))
1811  return; // No more files/macros that may be "contained" in this file.
1812 
1813  // Skip the files/macros of the #include'd file, we only care about macros
1814  // that lexed macro arguments from our file.
1815  if (Entry.getFile().NumCreatedFIDs)
1816  ID += Entry.getFile().NumCreatedFIDs - 1/*because of next ++ID*/;
1817  continue;
1818  }
1819 
1820  const ExpansionInfo &ExpInfo = Entry.getExpansion();
1821 
1822  if (ExpInfo.getExpansionLocStart().isFileID()) {
1823  if (!isInFileID(ExpInfo.getExpansionLocStart(), FID))
1824  return; // No more files/macros that may be "contained" in this file.
1825  }
1826 
1827  if (!ExpInfo.isMacroArgExpansion())
1828  continue;
1829 
1830  associateFileChunkWithMacroArgExp(MacroArgsCache, FID,
1831  ExpInfo.getSpellingLoc(),
1832  SourceLocation::getMacroLoc(Entry.getOffset()),
1833  getFileIDSize(FileID::get(ID)));
1834  }
1835 }
1836 
1837 void SourceManager::associateFileChunkWithMacroArgExp(
1838  MacroArgsMap &MacroArgsCache,
1839  FileID FID,
1840  SourceLocation SpellLoc,
1841  SourceLocation ExpansionLoc,
1842  unsigned ExpansionLength) const {
1843  if (!SpellLoc.isFileID()) {
1844  unsigned SpellBeginOffs = SpellLoc.getOffset();
1845  unsigned SpellEndOffs = SpellBeginOffs + ExpansionLength;
1846 
1847  // The spelling range for this macro argument expansion can span multiple
1848  // consecutive FileID entries. Go through each entry contained in the
1849  // spelling range and if one is itself a macro argument expansion, recurse
1850  // and associate the file chunk that it represents.
1851 
1852  FileID SpellFID; // Current FileID in the spelling range.
1853  unsigned SpellRelativeOffs;
1854  std::tie(SpellFID, SpellRelativeOffs) = getDecomposedLoc(SpellLoc);
1855  while (1) {
1856  const SLocEntry &Entry = getSLocEntry(SpellFID);
1857  unsigned SpellFIDBeginOffs = Entry.getOffset();
1858  unsigned SpellFIDSize = getFileIDSize(SpellFID);
1859  unsigned SpellFIDEndOffs = SpellFIDBeginOffs + SpellFIDSize;
1860  const ExpansionInfo &Info = Entry.getExpansion();
1861  if (Info.isMacroArgExpansion()) {
1862  unsigned CurrSpellLength;
1863  if (SpellFIDEndOffs < SpellEndOffs)
1864  CurrSpellLength = SpellFIDSize - SpellRelativeOffs;
1865  else
1866  CurrSpellLength = ExpansionLength;
1867  associateFileChunkWithMacroArgExp(MacroArgsCache, FID,
1868  Info.getSpellingLoc().getLocWithOffset(SpellRelativeOffs),
1869  ExpansionLoc, CurrSpellLength);
1870  }
1871 
1872  if (SpellFIDEndOffs >= SpellEndOffs)
1873  return; // we covered all FileID entries in the spelling range.
1874 
1875  // Move to the next FileID entry in the spelling range.
1876  unsigned advance = SpellFIDSize - SpellRelativeOffs + 1;
1877  ExpansionLoc = ExpansionLoc.getLocWithOffset(advance);
1878  ExpansionLength -= advance;
1879  ++SpellFID.ID;
1880  SpellRelativeOffs = 0;
1881  }
1882 
1883  }
1884 
1885  assert(SpellLoc.isFileID());
1886 
1887  unsigned BeginOffs;
1888  if (!isInFileID(SpellLoc, FID, &BeginOffs))
1889  return;
1890 
1891  unsigned EndOffs = BeginOffs + ExpansionLength;
1892 
1893  // Add a new chunk for this macro argument. A previous macro argument chunk
1894  // may have been lexed again, so e.g. if the map is
1895  // 0 -> SourceLocation()
1896  // 100 -> Expanded loc #1
1897  // 110 -> SourceLocation()
1898  // and we found a new macro FileID that lexed from offet 105 with length 3,
1899  // the new map will be:
1900  // 0 -> SourceLocation()
1901  // 100 -> Expanded loc #1
1902  // 105 -> Expanded loc #2
1903  // 108 -> Expanded loc #1
1904  // 110 -> SourceLocation()
1905  //
1906  // Since re-lexed macro chunks will always be the same size or less of
1907  // previous chunks, we only need to find where the ending of the new macro
1908  // chunk is mapped to and update the map with new begin/end mappings.
1909 
1910  MacroArgsMap::iterator I = MacroArgsCache.upper_bound(EndOffs);
1911  --I;
1912  SourceLocation EndOffsMappedLoc = I->second;
1913  MacroArgsCache[BeginOffs] = ExpansionLoc;
1914  MacroArgsCache[EndOffs] = EndOffsMappedLoc;
1915 }
1916 
1917 /// \brief If \arg Loc points inside a function macro argument, the returned
1918 /// location will be the macro location in which the argument was expanded.
1919 /// If a macro argument is used multiple times, the expanded location will
1920 /// be at the first expansion of the argument.
1921 /// e.g.
1922 /// MY_MACRO(foo);
1923 /// ^
1924 /// Passing a file location pointing at 'foo', will yield a macro location
1925 /// where 'foo' was expanded into.
1928  if (Loc.isInvalid() || !Loc.isFileID())
1929  return Loc;
1930 
1931  FileID FID;
1932  unsigned Offset;
1933  std::tie(FID, Offset) = getDecomposedLoc(Loc);
1934  if (FID.isInvalid())
1935  return Loc;
1936 
1937  MacroArgsMap *&MacroArgsCache = MacroArgsCacheMap[FID];
1938  if (!MacroArgsCache)
1939  computeMacroArgsCache(MacroArgsCache, FID);
1940 
1941  assert(!MacroArgsCache->empty());
1942  MacroArgsMap::iterator I = MacroArgsCache->upper_bound(Offset);
1943  --I;
1944 
1945  unsigned MacroArgBeginOffs = I->first;
1946  SourceLocation MacroArgExpandedLoc = I->second;
1947  if (MacroArgExpandedLoc.isValid())
1948  return MacroArgExpandedLoc.getLocWithOffset(Offset - MacroArgBeginOffs);
1949 
1950  return Loc;
1951 }
1952 
1953 std::pair<FileID, unsigned>
1955  if (FID.isInvalid())
1956  return std::make_pair(FileID(), 0);
1957 
1958  // Uses IncludedLocMap to retrieve/cache the decomposed loc.
1959 
1960  typedef std::pair<FileID, unsigned> DecompTy;
1961  typedef llvm::DenseMap<FileID, DecompTy> MapTy;
1962  std::pair<MapTy::iterator, bool>
1963  InsertOp = IncludedLocMap.insert(std::make_pair(FID, DecompTy()));
1964  DecompTy &DecompLoc = InsertOp.first->second;
1965  if (!InsertOp.second)
1966  return DecompLoc; // already in map.
1967 
1968  SourceLocation UpperLoc;
1969  bool Invalid = false;
1970  const SrcMgr::SLocEntry &Entry = getSLocEntry(FID, &Invalid);
1971  if (!Invalid) {
1972  if (Entry.isExpansion())
1973  UpperLoc = Entry.getExpansion().getExpansionLocStart();
1974  else
1975  UpperLoc = Entry.getFile().getIncludeLoc();
1976  }
1977 
1978  if (UpperLoc.isValid())
1979  DecompLoc = getDecomposedLoc(UpperLoc);
1980 
1981  return DecompLoc;
1982 }
1983 
1984 /// Given a decomposed source location, move it up the include/expansion stack
1985 /// to the parent source location. If this is possible, return the decomposed
1986 /// version of the parent in Loc and return false. If Loc is the top-level
1987 /// entry, return true and don't modify it.
1988 static bool MoveUpIncludeHierarchy(std::pair<FileID, unsigned> &Loc,
1989  const SourceManager &SM) {
1990  std::pair<FileID, unsigned> UpperLoc = SM.getDecomposedIncludedLoc(Loc.first);
1991  if (UpperLoc.first.isInvalid())
1992  return true; // We reached the top.
1993 
1994  Loc = UpperLoc;
1995  return false;
1996 }
1997 
1998 /// Return the cache entry for comparing the given file IDs
1999 /// for isBeforeInTranslationUnit.
2000 InBeforeInTUCacheEntry &SourceManager::getInBeforeInTUCache(FileID LFID,
2001  FileID RFID) const {
2002  // This is a magic number for limiting the cache size. It was experimentally
2003  // derived from a small Objective-C project (where the cache filled
2004  // out to ~250 items). We can make it larger if necessary.
2005  enum { MagicCacheSize = 300 };
2006  IsBeforeInTUCacheKey Key(LFID, RFID);
2007 
2008  // If the cache size isn't too large, do a lookup and if necessary default
2009  // construct an entry. We can then return it to the caller for direct
2010  // use. When they update the value, the cache will get automatically
2011  // updated as well.
2012  if (IBTUCache.size() < MagicCacheSize)
2013  return IBTUCache[Key];
2014 
2015  // Otherwise, do a lookup that will not construct a new value.
2016  InBeforeInTUCache::iterator I = IBTUCache.find(Key);
2017  if (I != IBTUCache.end())
2018  return I->second;
2019 
2020  // Fall back to the overflow value.
2021  return IBTUCacheOverflow;
2022 }
2023 
2024 /// \brief Determines the order of 2 source locations in the translation unit.
2025 ///
2026 /// \returns true if LHS source location comes before RHS, false otherwise.
2028  SourceLocation RHS) const {
2029  assert(LHS.isValid() && RHS.isValid() && "Passed invalid source location!");
2030  if (LHS == RHS)
2031  return false;
2032 
2033  std::pair<FileID, unsigned> LOffs = getDecomposedLoc(LHS);
2034  std::pair<FileID, unsigned> ROffs = getDecomposedLoc(RHS);
2035 
2036  // getDecomposedLoc may have failed to return a valid FileID because, e.g. it
2037  // is a serialized one referring to a file that was removed after we loaded
2038  // the PCH.
2039  if (LOffs.first.isInvalid() || ROffs.first.isInvalid())
2040  return LOffs.first.isInvalid() && !ROffs.first.isInvalid();
2041 
2042  // If the source locations are in the same file, just compare offsets.
2043  if (LOffs.first == ROffs.first)
2044  return LOffs.second < ROffs.second;
2045 
2046  // If we are comparing a source location with multiple locations in the same
2047  // file, we get a big win by caching the result.
2048  InBeforeInTUCacheEntry &IsBeforeInTUCache =
2049  getInBeforeInTUCache(LOffs.first, ROffs.first);
2050 
2051  // If we are comparing a source location with multiple locations in the same
2052  // file, we get a big win by caching the result.
2053  if (IsBeforeInTUCache.isCacheValid(LOffs.first, ROffs.first))
2054  return IsBeforeInTUCache.getCachedResult(LOffs.second, ROffs.second);
2055 
2056  // Okay, we missed in the cache, start updating the cache for this query.
2057  IsBeforeInTUCache.setQueryFIDs(LOffs.first, ROffs.first,
2058  /*isLFIDBeforeRFID=*/LOffs.first.ID < ROffs.first.ID);
2059 
2060  // We need to find the common ancestor. The only way of doing this is to
2061  // build the complete include chain for one and then walking up the chain
2062  // of the other looking for a match.
2063  // We use a map from FileID to Offset to store the chain. Easier than writing
2064  // a custom set hash info that only depends on the first part of a pair.
2065  typedef llvm::SmallDenseMap<FileID, unsigned, 16> LocSet;
2066  LocSet LChain;
2067  do {
2068  LChain.insert(LOffs);
2069  // We catch the case where LOffs is in a file included by ROffs and
2070  // quit early. The other way round unfortunately remains suboptimal.
2071  } while (LOffs.first != ROffs.first && !MoveUpIncludeHierarchy(LOffs, *this));
2073  while((I = LChain.find(ROffs.first)) == LChain.end()) {
2074  if (MoveUpIncludeHierarchy(ROffs, *this))
2075  break; // Met at topmost file.
2076  }
2077  if (I != LChain.end())
2078  LOffs = *I;
2079 
2080  // If we exited because we found a nearest common ancestor, compare the
2081  // locations within the common file and cache them.
2082  if (LOffs.first == ROffs.first) {
2083  IsBeforeInTUCache.setCommonLoc(LOffs.first, LOffs.second, ROffs.second);
2084  return IsBeforeInTUCache.getCachedResult(LOffs.second, ROffs.second);
2085  }
2086 
2087  // If we arrived here, the location is either in a built-ins buffer or
2088  // associated with global inline asm. PR5662 and PR22576 are examples.
2089 
2090  // Clear the lookup cache, it depends on a common location.
2091  IsBeforeInTUCache.clear();
2092  llvm::MemoryBuffer *LBuf = getBuffer(LOffs.first);
2093  llvm::MemoryBuffer *RBuf = getBuffer(ROffs.first);
2094  bool LIsBuiltins = strcmp("<built-in>", LBuf->getBufferIdentifier()) == 0;
2095  bool RIsBuiltins = strcmp("<built-in>", RBuf->getBufferIdentifier()) == 0;
2096  // Sort built-in before non-built-in.
2097  if (LIsBuiltins || RIsBuiltins) {
2098  if (LIsBuiltins != RIsBuiltins)
2099  return LIsBuiltins;
2100  // Both are in built-in buffers, but from different files. We just claim that
2101  // lower IDs come first.
2102  return LOffs.first < ROffs.first;
2103  }
2104  bool LIsAsm = strcmp("<inline asm>", LBuf->getBufferIdentifier()) == 0;
2105  bool RIsAsm = strcmp("<inline asm>", RBuf->getBufferIdentifier()) == 0;
2106  // Sort assembler after built-ins, but before the rest.
2107  if (LIsAsm || RIsAsm) {
2108  if (LIsAsm != RIsAsm)
2109  return RIsAsm;
2110  assert(LOffs.first == ROffs.first);
2111  return false;
2112  }
2113  llvm_unreachable("Unsortable locations found");
2114 }
2115 
2117  llvm::errs() << "\n*** Source Manager Stats:\n";
2118  llvm::errs() << FileInfos.size() << " files mapped, " << MemBufferInfos.size()
2119  << " mem buffers mapped.\n";
2120  llvm::errs() << LocalSLocEntryTable.size() << " local SLocEntry's allocated ("
2121  << llvm::capacity_in_bytes(LocalSLocEntryTable)
2122  << " bytes of capacity), "
2123  << NextLocalOffset << "B of Sloc address space used.\n";
2124  llvm::errs() << LoadedSLocEntryTable.size()
2125  << " loaded SLocEntries allocated, "
2126  << MaxLoadedOffset - CurrentLoadedOffset
2127  << "B of Sloc address space used.\n";
2128 
2129  unsigned NumLineNumsComputed = 0;
2130  unsigned NumFileBytesMapped = 0;
2131  for (fileinfo_iterator I = fileinfo_begin(), E = fileinfo_end(); I != E; ++I){
2132  NumLineNumsComputed += I->second->SourceLineCache != nullptr;
2133  NumFileBytesMapped += I->second->getSizeBytesMapped();
2134  }
2135  unsigned NumMacroArgsComputed = MacroArgsCacheMap.size();
2136 
2137  llvm::errs() << NumFileBytesMapped << " bytes of files mapped, "
2138  << NumLineNumsComputed << " files with line #'s computed, "
2139  << NumMacroArgsComputed << " files with macro args computed.\n";
2140  llvm::errs() << "FileID scans: " << NumLinearScans << " linear, "
2141  << NumBinaryProbes << " binary.\n";
2142 }
2143 
2144 LLVM_DUMP_METHOD void SourceManager::dump() const {
2145  llvm::raw_ostream &out = llvm::errs();
2146 
2147  auto DumpSLocEntry = [&](int ID, const SrcMgr::SLocEntry &Entry,
2148  llvm::Optional<unsigned> NextStart) {
2149  out << "SLocEntry <FileID " << ID << "> " << (Entry.isFile() ? "file" : "expansion")
2150  << " <SourceLocation " << Entry.getOffset() << ":";
2151  if (NextStart)
2152  out << *NextStart << ">\n";
2153  else
2154  out << "???\?>\n";
2155  if (Entry.isFile()) {
2156  auto &FI = Entry.getFile();
2157  if (FI.NumCreatedFIDs)
2158  out << " covers <FileID " << ID << ":" << int(ID + FI.NumCreatedFIDs)
2159  << ">\n";
2160  if (FI.getIncludeLoc().isValid())
2161  out << " included from " << FI.getIncludeLoc().getOffset() << "\n";
2162  if (auto *CC = FI.getContentCache()) {
2163  out << " for " << (CC->OrigEntry ? CC->OrigEntry->getName() : "<none>")
2164  << "\n";
2165  if (CC->BufferOverridden)
2166  out << " contents overridden\n";
2167  if (CC->ContentsEntry != CC->OrigEntry) {
2168  out << " contents from "
2169  << (CC->ContentsEntry ? CC->ContentsEntry->getName() : "<none>")
2170  << "\n";
2171  }
2172  }
2173  } else {
2174  auto &EI = Entry.getExpansion();
2175  out << " spelling from " << EI.getSpellingLoc().getOffset() << "\n";
2176  out << " macro " << (EI.isMacroArgExpansion() ? "arg" : "body")
2177  << " range <" << EI.getExpansionLocStart().getOffset() << ":"
2178  << EI.getExpansionLocEnd().getOffset() << ">\n";
2179  }
2180  };
2181 
2182  // Dump local SLocEntries.
2183  for (unsigned ID = 0, NumIDs = LocalSLocEntryTable.size(); ID != NumIDs; ++ID) {
2184  DumpSLocEntry(ID, LocalSLocEntryTable[ID],
2185  ID == NumIDs - 1 ? NextLocalOffset
2186  : LocalSLocEntryTable[ID + 1].getOffset());
2187  }
2188  // Dump loaded SLocEntries.
2189  llvm::Optional<unsigned> NextStart;
2190  for (unsigned Index = 0; Index != LoadedSLocEntryTable.size(); ++Index) {
2191  int ID = -(int)Index - 2;
2192  if (SLocEntryLoaded[Index]) {
2193  DumpSLocEntry(ID, LoadedSLocEntryTable[Index], NextStart);
2194  NextStart = LoadedSLocEntryTable[Index].getOffset();
2195  } else {
2196  NextStart = None;
2197  }
2198  }
2199 }
2200 
2202 
2203 /// Return the amount of memory used by memory buffers, breaking down
2204 /// by heap-backed versus mmap'ed memory.
2206  size_t malloc_bytes = 0;
2207  size_t mmap_bytes = 0;
2208 
2209  for (unsigned i = 0, e = MemBufferInfos.size(); i != e; ++i)
2210  if (size_t sized_mapped = MemBufferInfos[i]->getSizeBytesMapped())
2211  switch (MemBufferInfos[i]->getMemoryBufferKind()) {
2212  case llvm::MemoryBuffer::MemoryBuffer_MMap:
2213  mmap_bytes += sized_mapped;
2214  break;
2215  case llvm::MemoryBuffer::MemoryBuffer_Malloc:
2216  malloc_bytes += sized_mapped;
2217  break;
2218  }
2219 
2220  return MemoryBufferSizes(malloc_bytes, mmap_bytes);
2221 }
2222 
2224  size_t size = llvm::capacity_in_bytes(MemBufferInfos)
2225  + llvm::capacity_in_bytes(LocalSLocEntryTable)
2226  + llvm::capacity_in_bytes(LoadedSLocEntryTable)
2227  + llvm::capacity_in_bytes(SLocEntryLoaded)
2228  + llvm::capacity_in_bytes(FileInfos);
2229 
2230  if (OverriddenFilesInfo)
2231  size += llvm::capacity_in_bytes(OverriddenFilesInfo->OverriddenFiles);
2232 
2233  return size;
2234 }
bool hasLineDirectives() const
Return true if this FileID has #line directives in it.
bool isMacroArgExpansion(SourceLocation Loc, SourceLocation *StartLoc=nullptr) const
Tests whether the given source location represents a macro argument's expansion into the function-lik...
static DiagnosticBuilder Diag(DiagnosticsEngine *Diags, const LangOptions &Features, FullSourceLoc TokLoc, const char *TokBegin, const char *TokRangeBegin, const char *TokRangeEnd, unsigned DiagID)
Produce a diagnostic highlighting some portion of a literal.
This is a discriminated union of FileInfo and ExpansionInfo.
static bool MoveUpIncludeHierarchy(std::pair< FileID, unsigned > &Loc, const SourceManager &SM)
Given a decomposed source location, move it up the include/expansion stack to the parent source locat...
unsigned getColumn() const
Return the presumed column number of this location.
bool isMacroID() const
std::pair< FileID, unsigned > getDecomposedExpansionLoc(SourceLocation Loc) const
Decompose the specified location into a raw FileID + Offset pair.
Implements support for file system lookup, file system caching, and directory search management...
Definition: FileManager.h:115
unsigned local_sloc_entry_size() const
Get the number of local SLocEntries we have.
Defines the clang::FileManager interface and associated types.
SourceLocation getImmediateSpellingLoc(SourceLocation Loc) const
Given a SourceLocation object, return the spelling location referenced by the ID. ...
Defines the SourceManager interface.
unsigned getNextLocalOffset() const
unsigned getSpellingLineNumber(SourceLocation Loc, bool *Invalid=nullptr) const
const SrcMgr::SLocEntry & getSLocEntry(FileID FID, bool *Invalid=nullptr) const
const char * getCharacterData(SourceLocation SL, bool *Invalid=nullptr) const
Return a pointer to the start of the specified location in the appropriate spelling MemoryBuffer...
llvm::MemoryBuffer * getBuffer(FileID FID, SourceLocation Loc, bool *Invalid=nullptr) const
Return the buffer for the specified FileID.
unsigned getPresumedLineNumber(SourceLocation Loc, bool *Invalid=nullptr) const
Each ExpansionInfo encodes the expansion location - where the token was ultimately expanded...
const ExpansionInfo & getExpansion() const
std::unique_ptr< llvm::MemoryBuffer > Buffer
DiagnosticBuilder Report(SourceLocation Loc, unsigned DiagID)
Issue the message to the client.
Definition: Diagnostic.h:1117
void setQueryFIDs(FileID LHS, FileID RHS, bool isLFIDBeforeRFID)
Set up a new query.
void AddLineNote(SourceLocation Loc, unsigned LineNo, int FilenameID)
Add a line note to the line table for the FileID and offset specified by Loc.
llvm::DenseMap< Stmt *, Stmt * > MapTy
Definition: ParentMap.cpp:22
fileinfo_iterator fileinfo_begin() const
void setCommonLoc(FileID commonFID, unsigned lCommonOffset, unsigned rCommonOffset)
SourceLocation getIncludeLoc() const
CharacteristicKind getFileCharacteristic() const
Return whether this is a system header or not.
virtual bool ReadSLocEntry(int ID)=0
Read the source location entry with index ID, which will always be less than -1.
unsigned getLineTableFilenameID(StringRef Str)
void SetDelayedDiagnostic(unsigned DiagID, StringRef Arg1="", StringRef Arg2="")
Set the "delayed" diagnostic that will be emitted once the current diagnostic completes.
Definition: Diagnostic.cpp:140
static LLVM_ATTRIBUTE_NOINLINE void ComputeLineNumbers(DiagnosticsEngine &Diag, ContentCache *FI, llvm::BumpPtrAllocator &Alloc, const SourceManager &SM, bool &Invalid)
CharacteristicKind
Indicates whether a file or directory holds normal user code, system code, or system code which is im...
Definition: SourceManager.h:79
Used to hold and unique data used to represent #line information.
off_t getSize() const
Definition: FileManager.h:86
void disableFileContentsOverride(const FileEntry *File)
Disable overridding the contents of a file, previously enabled with overrideFileContents.
class LLVM_ALIGNAS(8) DependentTemplateSpecializationType const IdentifierInfo * Name
Represents a template specialization type whose template cannot be resolved, e.g. ...
Definition: Type.h:4381
StringRef getBufferData(FileID FID, bool *Invalid=nullptr) const
Return a StringRef to the source buffer data for the specified FileID.
std::pair< SourceLocation, SourceLocation > getExpansionRange(SourceLocation Loc) const
Given a SourceLocation object, return the range of tokens covered by the expansion in the ultimate fi...
bool isDiagnosticInFlight() const
Determine whethere there is already a diagnostic in flight.
Definition: Diagnostic.h:678
bool isFileID() const
const LineEntry * FindNearestLineEntry(FileID FID, unsigned Offset)
Find the line entry nearest to FID that is before it.
bool isFileOverridden(const FileEntry *File)
Returns true if the file contents have been overridden.
void setSourceManager(SourceManager *SrcMgr)
Definition: Diagnostic.h:383
unsigned getExpansionColumnNumber(SourceLocation Loc, bool *Invalid=nullptr) const
std::pair< FileID, unsigned > getDecomposedSpellingLoc(SourceLocation Loc) const
Decompose the specified location into a raw FileID + Offset pair.
static __inline__ __m128i __DEFAULT_FN_ATTRS _mm_set1_epi8(char __b)
Definition: emmintrin.h:1190
unsigned getFileIDSize(FileID FID) const
The size of the SLocEntry that FID represents.
SourceLocation getLocWithOffset(int Offset) const
Return a source location with the specified offset from this SourceLocation.
uint32_t Offset
Definition: CacheTokens.cpp:44
bool isMacroBodyExpansion(SourceLocation Loc) const
Tests whether the given source location represents the expansion of a macro body. ...
Concrete class used by the front-end to report problems and issues.
Definition: Diagnostic.h:135
unsigned getLine() const
Return the presumed line number of this location.
SourceLocation translateFileLineCol(const FileEntry *SourceFile, unsigned Line, unsigned Col) const
Get the source location for the given file:line:col triplet.
detail::InMemoryDirectory::const_iterator I
bool isInvalid() const
SrcMgr::CharacteristicKind FileKind
Set the 0 if no flags, 1 if a system header,.
FileID getFileID(SourceLocation SpellingLoc) const
Return the FileID for a SourceLocation.
bool isMacroBodyExpansion() const
StringRef Filename
Definition: Format.cpp:1723
unsigned getPresumedColumnNumber(SourceLocation Loc, bool *Invalid=nullptr) const
const SmallVectorImpl< AnnotatedLine * >::const_iterator End
ID
Defines the set of possible language-specific address spaces.
Definition: AddressSpaces.h:27
SourceLocation translateLineCol(FileID FID, unsigned Line, unsigned Col) const
Get the source location in FID for the given line:col.
void setFileIsTransient(const FileEntry *SourceFile)
Specify that a file is transient.
SourceManager & SM
size_t getDataStructureSizes() const
Return the amount of memory used for various side tables and data structures in the SourceManager...
bool isInFileID(SourceLocation Loc, FileID FID, unsigned *RelativeOffset=nullptr) const
Given a specific FileID, returns true if Loc is inside that FileID chunk and sets relative offset (of...
SourceLocation getMacroArgExpandedLocation(SourceLocation Loc) const
If Loc points inside a function macro argument, the returned location will be the macro location in w...
static Optional< llvm::sys::fs::UniqueID > getActualFileUID(const FileEntry *File)
Retrieve the inode for the given file entry, if possible.
bool isBeforeInTranslationUnit(SourceLocation LHS, SourceLocation RHS) const
Determines the order of 2 source locations in the translation unit.
FileID createFileID(const FileEntry *SourceFile, SourceLocation IncludePos, SrcMgr::CharacteristicKind FileCharacter, int LoadedID=0, unsigned LoadedOffset=0)
Create a new FileID that represents the specified file being #included from the specified IncludePosi...
Defines implementation details of the clang::SourceManager class.
FileManager & getFileManager() const
SourceLocation createMacroArgExpansionLoc(SourceLocation Loc, SourceLocation ExpansionLoc, unsigned TokLength)
Return a new SourceLocation that encodes the fact that a token from SpellingLoc should actually be re...
const SrcMgr::SLocEntry & getLocalSLocEntry(unsigned Index, bool *Invalid=nullptr) const
Get a local SLocEntry. This is exposed for indexing.
const char * getBufferName(SourceLocation Loc, bool *Invalid=nullptr) const
Return the filename or buffer identifier of the buffer the location is in.
static LineEntry get(unsigned Offs, unsigned Line, int Filename, SrcMgr::CharacteristicKind FileKind, unsigned IncludeOffset)
unsigned getExpansionLineNumber(SourceLocation Loc, bool *Invalid=nullptr) const
Represents an unpacked "presumed" location which can be presented to the user.
SourceLocation createExpansionLoc(SourceLocation Loc, SourceLocation ExpansionLocStart, SourceLocation ExpansionLocEnd, unsigned TokLength, int LoadedID=0, unsigned LoadedOffset=0)
Return a new SourceLocation that encodes the fact that a token from SpellingLoc should actually be re...
SourceLocation getExpansionLocEnd() const
unsigned getColumnNumber(FileID FID, unsigned FilePos, bool *Invalid=nullptr) const
Return the column # for the specified file position.
void AddEntry(FileID FID, const std::vector< LineEntry > &Entries)
Add a new line entry that has already been encoded into the internal representation of the line table...
void overrideFileContents(const FileEntry *SourceFile, llvm::MemoryBuffer *Buffer, bool DoNotFree)
Override the contents of the given source file by providing an already-allocated buffer.
bool isInMainFile(SourceLocation Loc) const
Returns whether the PresumedLoc for a given SourceLocation is in the main file.
Information about a FileID, basically just the logical file that it represents and include stack info...
#define false
Definition: stdbool.h:33
Kind
const char * getName() const
Definition: FileManager.h:84
Encodes a location in the source.
const TemplateArgument * iterator
Definition: Type.h:4070
AnnotatedLine & Line
bool isValid() const
Return true if this is a valid SourceLocation object.
unsigned getOffset() const
Cached information about one file (either on disk or in the virtual file system). ...
Definition: FileManager.h:53
bool isAtEndOfImmediateMacroExpansion(SourceLocation Loc, SourceLocation *MacroEnd=nullptr) const
Returns true if the given MacroID location points at the character end of the immediate macro expansi...
unsigned getSpellingColumnNumber(SourceLocation Loc, bool *Invalid=nullptr) const
llvm::MemoryBuffer * getMemoryBufferForFile(const FileEntry *File, bool *Invalid=nullptr)
Retrieve the memory buffer associated with the given file.
bool isCacheValid(FileID LHS, FileID RHS) const
Return true if the currently cached values match up with the specified LHS/RHS query.
const FileInfo & getFile() const
__SIZE_TYPE__ size_t
Definition: stddef.h:62
An opaque identifier used by SourceManager which refers to a source file (MemoryBuffer) along with it...
MemoryBufferSizes getMemoryBufferSizes() const
Return the amount of memory used by memory buffers, breaking down by heap-backed versus mmap'ed memor...
bool getCachedResult(unsigned LOffset, unsigned ROffset) const
If the cache is valid, compute the result given the specified offsets in the LHS/RHS FileID's...
const char * getFilename(unsigned ID) const
SrcMgr::CharacteristicKind getFileCharacteristic(SourceLocation Loc) const
Return the file characteristic of the specified source location, indicating whether this is a normal ...
unsigned getLineTableFilenameID(StringRef Str)
Return the uniqued ID for the specified filename.
bool isAtStartOfImmediateMacroExpansion(SourceLocation Loc, SourceLocation *MacroBegin=nullptr) const
Returns true if the given MacroID location points at the beginning of the immediate macro expansion...
std::pair< SourceLocation, SourceLocation > getImmediateExpansionRange(SourceLocation Loc) const
Return the start/end of the expansion information for an expansion location.
std::unique_ptr< DiagnosticConsumer > create(StringRef OutputFile, DiagnosticOptions *Diags, bool MergeChildRecords=false)
Returns a DiagnosticConsumer that serializes diagnostics to a bitcode file.
llvm::ErrorOr< std::unique_ptr< llvm::MemoryBuffer > > getBufferForFile(const FileEntry *Entry, bool isVolatile=false, bool ShouldCloseOpenFile=true)
Open the specified file as a MemoryBuffer, returning a new MemoryBuffer if successful, otherwise returning null.
void AddLineNote(FileID FID, unsigned Offset, unsigned LineNo, int FilenameID)
AddLineNote - Add a line note to the line table that indicates that there is a #line at the specified...
const ContentCache * getContentCache() const
fileinfo_iterator fileinfo_end() const
unsigned getLineNumber(FileID FID, unsigned FilePos, bool *Invalid=nullptr) const
Given a SourceLocation, return the spelling line number for the position indicated.
detail::InMemoryDirectory::const_iterator E
SourceLocation getExpansionLocStart() const
llvm::DenseMap< const FileEntry *, SrcMgr::ContentCache * >::const_iterator fileinfo_iterator
FileID translateFile(const FileEntry *SourceFile) const
Get the FileID for the given file.
Defines the Diagnostic-related interfaces.
bool userFilesAreVolatile() const
True if non-system source files should be treated as volatile (likely to change while trying to use t...
Holds the cache used by isBeforeInTranslationUnit.
bool isInvalid() const
std::pair< int, unsigned > AllocateLoadedSLocEntries(unsigned NumSLocEntries, unsigned TotalSize)
Allocate a number of loaded SLocEntries, which will be actually loaded on demand from the external so...
static bool isInvalid(SourceLocation Loc, bool *Invalid)
static __inline__ __m128i __DEFAULT_FN_ATTRS _mm_or_si128(__m128i __a, __m128i __b)
Definition: emmintrin.h:828
void PrintStats() const
Print statistics to stderr.
LineTableInfo & getLineTable()
Retrieve the stored line table.
static __inline__ int __DEFAULT_FN_ATTRS _mm_movemask_epi8(__m128i __a)
Definition: emmintrin.h:1330
unsigned loaded_sloc_entry_size() const
Get the number of loaded SLocEntries we have.
SourceLocation getLocForStartOfFile(FileID FID) const
Return the source location corresponding to the first byte of the specified file. ...
std::pair< SourceLocation, SourceLocation > getExpansionLocRange() const
#define true
Definition: stdbool.h:32
const SrcMgr::SLocEntry & getLoadedSLocEntry(unsigned Index, bool *Invalid=nullptr) const
Get a loaded SLocEntry. This is exposed for indexing.
std::pair< FileID, unsigned > getDecomposedIncludedLoc(FileID FID) const
Returns the "included/expanded in" decomposed location of the given FileID.
bool isValid() const
std::pair< FileID, unsigned > getDecomposedLoc(SourceLocation Loc) const
Decompose the specified location into a raw FileID + Offset pair.
This class handles loading and caching of source files into memory.
static __inline__ __m128i __DEFAULT_FN_ATTRS _mm_cmpeq_epi8(__m128i __a, __m128i __b)
Definition: emmintrin.h:982
SourceLocation getSpellingLoc() const
PresumedLoc getPresumedLoc(SourceLocation Loc, bool UseLineDirectives=true) const
Returns the "presumed" location of a SourceLocation specifies.