1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
|
//===--- SourceManager.cpp - Track and cache source files -----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the SourceManager interface.
//
//===----------------------------------------------------------------------===//
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/SourceManagerInternals.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/FileManager.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/System/Path.h"
#include <algorithm>
#include <string>
#include <cstring>
using namespace clang;
using namespace SrcMgr;
using llvm::MemoryBuffer;
//===----------------------------------------------------------------------===//
// SourceManager Helper Classes
//===----------------------------------------------------------------------===//
ContentCache::~ContentCache() {
delete Buffer.getPointer();
}
/// getSizeBytesMapped - Returns the number of bytes actually mapped for
/// this ContentCache. This can be 0 if the MemBuffer was not actually
/// instantiated.
unsigned ContentCache::getSizeBytesMapped() const {
return Buffer.getPointer() ? Buffer.getPointer()->getBufferSize() : 0;
}
/// getSize - Returns the size of the content encapsulated by this ContentCache.
/// This can be the size of the source file or the size of an arbitrary
/// scratch buffer. If the ContentCache encapsulates a source file, that
/// file is not lazily brought in from disk to satisfy this query.
unsigned ContentCache::getSize() const {
return Buffer.getPointer() ? (unsigned) Buffer.getPointer()->getBufferSize()
: (unsigned) Entry->getSize();
}
void ContentCache::replaceBuffer(const llvm::MemoryBuffer *B) {
assert(B != Buffer.getPointer());
delete Buffer.getPointer();
Buffer.setPointer(B);
Buffer.setInt(false);
}
const llvm::MemoryBuffer *ContentCache::getBuffer(Diagnostic &Diag,
bool *Invalid) const {
if (Invalid)
*Invalid = false;
// Lazily create the Buffer for ContentCaches that wrap files.
if (!Buffer.getPointer() && Entry) {
std::string ErrorStr;
struct stat FileInfo;
Buffer.setPointer(MemoryBuffer::getFile(Entry->getName(), &ErrorStr,
Entry->getSize(), &FileInfo));
Buffer.setInt(false);
// If we were unable to open the file, then we are in an inconsistent
// situation where the content cache referenced a file which no longer
// exists. Most likely, we were using a stat cache with an invalid entry but
// the file could also have been removed during processing. Since we can't
// really deal with this situation, just create an empty buffer.
//
// FIXME: This is definitely not ideal, but our immediate clients can't
// currently handle returning a null entry here. Ideally we should detect
// that we are in an inconsistent situation and error out as quickly as
// possible.
if (!Buffer.getPointer()) {
const llvm::StringRef FillStr("<<<MISSING SOURCE FILE>>>\n");
Buffer.setPointer(MemoryBuffer::getNewMemBuffer(Entry->getSize(),
"<invalid>"));
char *Ptr = const_cast<char*>(Buffer.getPointer()->getBufferStart());
for (unsigned i = 0, e = Entry->getSize(); i != e; ++i)
Ptr[i] = FillStr[i % FillStr.size()];
if (Diag.isDiagnosticInFlight())
Diag.SetDelayedDiagnostic(diag::err_cannot_open_file,
Entry->getName(), ErrorStr);
else
Diag.Report(diag::err_cannot_open_file)
<< Entry->getName() << ErrorStr;
Buffer.setInt(true);
} else if (FileInfo.st_size != Entry->getSize() ||
FileInfo.st_mtime != Entry->getModificationTime()) {
// Check that the file's size, modification time, and inode are
// the same as in the file entry (which may have come from a
// stat cache).
if (Diag.isDiagnosticInFlight())
Diag.SetDelayedDiagnostic(diag::err_file_modified,
Entry->getName());
else
Diag.Report(diag::err_file_modified) << Entry->getName();
Buffer.setInt(true);
}
}
if (Invalid)
*Invalid = Buffer.getInt();
return Buffer.getPointer();
}
unsigned LineTableInfo::getLineTableFilenameID(const char *Ptr, unsigned Len) {
// Look up the filename in the string table, returning the pre-existing value
// if it exists.
llvm::StringMapEntry<unsigned> &Entry =
FilenameIDs.GetOrCreateValue(Ptr, Ptr+Len, ~0U);
if (Entry.getValue() != ~0U)
return Entry.getValue();
// Otherwise, assign this the next available ID.
Entry.setValue(FilenamesByID.size());
FilenamesByID.push_back(&Entry);
return FilenamesByID.size()-1;
}
/// AddLineNote - Add a line note to the line table that indicates that there
/// is a #line at the specified FID/Offset location which changes the presumed
/// location to LineNo/FilenameID.
void LineTableInfo::AddLineNote(unsigned FID, unsigned Offset,
unsigned LineNo, int FilenameID) {
std::vector<LineEntry> &Entries = LineEntries[FID];
assert((Entries.empty() || Entries.back().FileOffset < Offset) &&
"Adding line entries out of order!");
SrcMgr::CharacteristicKind Kind = SrcMgr::C_User;
unsigned IncludeOffset = 0;
if (!Entries.empty()) {
// If this is a '#line 4' after '#line 42 "foo.h"', make sure to remember
// that we are still in "foo.h".
if (FilenameID == -1)
FilenameID = Entries.back().FilenameID;
// If we are after a line marker that switched us to system header mode, or
// that set #include information, preserve it.
Kind = Entries.back().FileKind;
IncludeOffset = Entries.back().IncludeOffset;
}
Entries.push_back(LineEntry::get(Offset, LineNo, FilenameID, Kind,
IncludeOffset));
}
/// AddLineNote This is the same as the previous version of AddLineNote, but is
/// used for GNU line markers. If EntryExit is 0, then this doesn't change the
/// presumed #include stack. If it is 1, this is a file entry, if it is 2 then
/// this is a file exit. FileKind specifies whether this is a system header or
/// extern C system header.
void LineTableInfo::AddLineNote(unsigned FID, unsigned Offset,
unsigned LineNo, int FilenameID,
unsigned EntryExit,
SrcMgr::CharacteristicKind FileKind) {
assert(FilenameID != -1 && "Unspecified filename should use other accessor");
std::vector<LineEntry> &Entries = LineEntries[FID];
assert((Entries.empty() || Entries.back().FileOffset < Offset) &&
"Adding line entries out of order!");
unsigned IncludeOffset = 0;
if (EntryExit == 0) { // No #include stack change.
IncludeOffset = Entries.empty() ? 0 : Entries.back().IncludeOffset;
} else if (EntryExit == 1) {
IncludeOffset = Offset-1;
} else if (EntryExit == 2) {
assert(!Entries.empty() && Entries.back().IncludeOffset &&
"PPDirectives should have caught case when popping empty include stack");
// Get the include loc of the last entries' include loc as our include loc.
IncludeOffset = 0;
if (const LineEntry *PrevEntry =
FindNearestLineEntry(FID, Entries.back().IncludeOffset))
IncludeOffset = PrevEntry->IncludeOffset;
}
Entries.push_back(LineEntry::get(Offset, LineNo, FilenameID, FileKind,
IncludeOffset));
}
/// FindNearestLineEntry - Find the line entry nearest to FID that is before
/// it. If there is no line entry before Offset in FID, return null.
const LineEntry *LineTableInfo::FindNearestLineEntry(unsigned FID,
unsigned Offset) {
const std::vector<LineEntry> &Entries = LineEntries[FID];
assert(!Entries.empty() && "No #line entries for this FID after all!");
// It is very common for the query to be after the last #line, check this
// first.
if (Entries.back().FileOffset <= Offset)
return &Entries.back();
// Do a binary search to find the maximal element that is still before Offset.
std::vector<LineEntry>::const_iterator I =
std::upper_bound(Entries.begin(), Entries.end(), Offset);
if (I == Entries.begin()) return 0;
return &*--I;
}
/// \brief Add a new line entry that has already been encoded into
/// the internal representation of the line table.
void LineTableInfo::AddEntry(unsigned FID,
const std::vector<LineEntry> &Entries) {
LineEntries[FID] = Entries;
}
/// getLineTableFilenameID - Return the uniqued ID for the specified filename.
///
unsigned SourceManager::getLineTableFilenameID(const char *Ptr, unsigned Len) {
if (LineTable == 0)
LineTable = new LineTableInfo();
return LineTable->getLineTableFilenameID(Ptr, Len);
}
/// AddLineNote - Add a line note to the line table for the FileID and offset
/// specified by Loc. If FilenameID is -1, it is considered to be
/// unspecified.
void SourceManager::AddLineNote(SourceLocation Loc, unsigned LineNo,
int FilenameID) {
std::pair<FileID, unsigned> LocInfo = getDecomposedInstantiationLoc(Loc);
const SrcMgr::FileInfo &FileInfo = getSLocEntry(LocInfo.first).getFile();
// Remember that this file has #line directives now if it doesn't already.
const_cast<SrcMgr::FileInfo&>(FileInfo).setHasLineDirectives();
if (LineTable == 0)
LineTable = new LineTableInfo();
LineTable->AddLineNote(LocInfo.first.ID, LocInfo.second, LineNo, FilenameID);
}
/// AddLineNote - Add a GNU line marker to the line table.
void SourceManager::AddLineNote(SourceLocation Loc, unsigned LineNo,
int FilenameID, bool IsFileEntry,
bool IsFileExit, bool IsSystemHeader,
bool IsExternCHeader) {
// If there is no filename and no flags, this is treated just like a #line,
// which does not change the flags of the previous line marker.
if (FilenameID == -1) {
assert(!IsFileEntry && !IsFileExit && !IsSystemHeader && !IsExternCHeader &&
"Can't set flags without setting the filename!");
return AddLineNote(Loc, LineNo, FilenameID);
}
std::pair<FileID, unsigned> LocInfo = getDecomposedInstantiationLoc(Loc);
const SrcMgr::FileInfo &FileInfo = getSLocEntry(LocInfo.first).getFile();
// Remember that this file has #line directives now if it doesn't already.
const_cast<SrcMgr::FileInfo&>(FileInfo).setHasLineDirectives();
if (LineTable == 0)
LineTable = new LineTableInfo();
SrcMgr::CharacteristicKind FileKind;
if (IsExternCHeader)
FileKind = SrcMgr::C_ExternCSystem;
else if (IsSystemHeader)
FileKind = SrcMgr::C_System;
else
FileKind = SrcMgr::C_User;
unsigned EntryExit = 0;
if (IsFileEntry)
EntryExit = 1;
else if (IsFileExit)
EntryExit = 2;
LineTable->AddLineNote(LocInfo.first.ID, LocInfo.second, LineNo, FilenameID,
EntryExit, FileKind);
}
LineTableInfo &SourceManager::getLineTable() {
if (LineTable == 0)
LineTable = new LineTableInfo();
return *LineTable;
}
//===----------------------------------------------------------------------===//
// Private 'Create' methods.
//===----------------------------------------------------------------------===//
SourceManager::~SourceManager() {
delete LineTable;
// Delete FileEntry objects corresponding to content caches. Since the actual
// content cache objects are bump pointer allocated, we just have to run the
// dtors, but we call the deallocate method for completeness.
for (unsigned i = 0, e = MemBufferInfos.size(); i != e; ++i) {
MemBufferInfos[i]->~ContentCache();
ContentCacheAlloc.Deallocate(MemBufferInfos[i]);
}
for (llvm::DenseMap<const FileEntry*, SrcMgr::ContentCache*>::iterator
I = FileInfos.begin(), E = FileInfos.end(); I != E; ++I) {
I->second->~ContentCache();
ContentCacheAlloc.Deallocate(I->second);
}
}
void SourceManager::clearIDTables() {
MainFileID = FileID();
SLocEntryTable.clear();
LastLineNoFileIDQuery = FileID();
LastLineNoContentCache = 0;
LastFileIDLookup = FileID();
if (LineTable)
LineTable->clear();
// Use up FileID #0 as an invalid instantiation.
NextOffset = 0;
createInstantiationLoc(SourceLocation(),SourceLocation(),SourceLocation(), 1);
}
/// getOrCreateContentCache - Create or return a cached ContentCache for the
/// specified file.
const ContentCache *
SourceManager::getOrCreateContentCache(const FileEntry *FileEnt) {
assert(FileEnt && "Didn't specify a file entry to use?");
// Do we already have information about this file?
ContentCache *&Entry = FileInfos[FileEnt];
if (Entry) return Entry;
// Nope, create a new Cache entry. Make sure it is at least 8-byte aligned
// so that FileInfo can use the low 3 bits of the pointer for its own
// nefarious purposes.
unsigned EntryAlign = llvm::AlignOf<ContentCache>::Alignment;
EntryAlign = std::max(8U, EntryAlign);
Entry = ContentCacheAlloc.Allocate<ContentCache>(1, EntryAlign);
new (Entry) ContentCache(FileEnt);
return Entry;
}
/// createMemBufferContentCache - Create a new ContentCache for the specified
/// memory buffer. This does no caching.
const ContentCache*
SourceManager::createMemBufferContentCache(const MemoryBuffer *Buffer) {
// Add a new ContentCache to the MemBufferInfos list and return it. Make sure
// it is at least 8-byte aligned so that FileInfo can use the low 3 bits of
// the pointer for its own nefarious purposes.
unsigned EntryAlign = llvm::AlignOf<ContentCache>::Alignment;
EntryAlign = std::max(8U, EntryAlign);
ContentCache *Entry = ContentCacheAlloc.Allocate<ContentCache>(1, EntryAlign);
new (Entry) ContentCache();
MemBufferInfos.push_back(Entry);
Entry->setBuffer(Buffer);
return Entry;
}
void SourceManager::PreallocateSLocEntries(ExternalSLocEntrySource *Source,
unsigned NumSLocEntries,
unsigned NextOffset) {
ExternalSLocEntries = Source;
this->NextOffset = NextOffset;
SLocEntryLoaded.resize(NumSLocEntries + 1);
SLocEntryLoaded[0] = true;
SLocEntryTable.resize(SLocEntryTable.size() + NumSLocEntries);
}
void SourceManager::ClearPreallocatedSLocEntries() {
unsigned I = 0;
for (unsigned N = SLocEntryLoaded.size(); I != N; ++I)
if (!SLocEntryLoaded[I])
break;
// We've already loaded all preallocated source location entries.
if (I == SLocEntryLoaded.size())
return;
// Remove everything from location I onward.
SLocEntryTable.resize(I);
SLocEntryLoaded.clear();
ExternalSLocEntries = 0;
}
//===----------------------------------------------------------------------===//
// Methods to create new FileID's and instantiations.
//===----------------------------------------------------------------------===//
/// createFileID - Create a new fileID for the specified ContentCache and
/// include position. This works regardless of whether the ContentCache
/// corresponds to a file or some other input source.
FileID SourceManager::createFileID(const ContentCache *File,
SourceLocation IncludePos,
SrcMgr::CharacteristicKind FileCharacter,
unsigned PreallocatedID,
unsigned Offset) {
if (PreallocatedID) {
// If we're filling in a preallocated ID, just load in the file
// entry and return.
assert(PreallocatedID < SLocEntryLoaded.size() &&
"Preallocate ID out-of-range");
assert(!SLocEntryLoaded[PreallocatedID] &&
"Source location entry already loaded");
assert(Offset && "Preallocate source location cannot have zero offset");
SLocEntryTable[PreallocatedID]
= SLocEntry::get(Offset, FileInfo::get(IncludePos, File, FileCharacter));
SLocEntryLoaded[PreallocatedID] = true;
FileID FID = FileID::get(PreallocatedID);
return FID;
}
SLocEntryTable.push_back(SLocEntry::get(NextOffset,
FileInfo::get(IncludePos, File,
FileCharacter)));
unsigned FileSize = File->getSize();
assert(NextOffset+FileSize+1 > NextOffset && "Ran out of source locations!");
NextOffset += FileSize+1;
// Set LastFileIDLookup to the newly created file. The next getFileID call is
// almost guaranteed to be from that file.
FileID FID = FileID::get(SLocEntryTable.size()-1);
return LastFileIDLookup = FID;
}
/// createInstantiationLoc - Return a new SourceLocation that encodes the fact
/// that a token from SpellingLoc should actually be referenced from
/// InstantiationLoc.
SourceLocation SourceManager::createInstantiationLoc(SourceLocation SpellingLoc,
SourceLocation ILocStart,
SourceLocation ILocEnd,
unsigned TokLength,
unsigned PreallocatedID,
unsigned Offset) {
InstantiationInfo II = InstantiationInfo::get(ILocStart,ILocEnd, SpellingLoc);
if (PreallocatedID) {
// If we're filling in a preallocated ID, just load in the
// instantiation entry and return.
assert(PreallocatedID < SLocEntryLoaded.size() &&
"Preallocate ID out-of-range");
assert(!SLocEntryLoaded[PreallocatedID] &&
"Source location entry already loaded");
assert(Offset && "Preallocate source location cannot have zero offset");
SLocEntryTable[PreallocatedID] = SLocEntry::get(Offset, II);
SLocEntryLoaded[PreallocatedID] = true;
return SourceLocation::getMacroLoc(Offset);
}
SLocEntryTable.push_back(SLocEntry::get(NextOffset, II));
assert(NextOffset+TokLength+1 > NextOffset && "Ran out of source locations!");
NextOffset += TokLength+1;
return SourceLocation::getMacroLoc(NextOffset-(TokLength+1));
}
const llvm::MemoryBuffer *
SourceManager::getMemoryBufferForFile(const FileEntry *File,
bool *Invalid) {
const SrcMgr::ContentCache *IR = getOrCreateContentCache(File);
assert(IR && "getOrCreateContentCache() cannot return NULL");
return IR->getBuffer(Diag, Invalid);
}
bool SourceManager::overrideFileContents(const FileEntry *SourceFile,
const llvm::MemoryBuffer *Buffer) {
const SrcMgr::ContentCache *IR = getOrCreateContentCache(SourceFile);
if (IR == 0)
return true;
const_cast<SrcMgr::ContentCache *>(IR)->replaceBuffer(Buffer);
return false;
}
llvm::StringRef SourceManager::getBufferData(FileID FID, bool *Invalid) const {
bool MyInvalid = false;
const llvm::MemoryBuffer *Buf = getBuffer(FID, &MyInvalid);
if (Invalid)
*Invalid = MyInvalid;
if (MyInvalid)
return "";
return Buf->getBuffer();
}
//===----------------------------------------------------------------------===//
// SourceLocation manipulation methods.
//===----------------------------------------------------------------------===//
/// getFileIDSlow - Return the FileID for a SourceLocation. This is a very hot
/// method that is used for all SourceManager queries that start with a
/// SourceLocation object. It is responsible for finding the entry in
/// SLocEntryTable which contains the specified location.
///
FileID SourceManager::getFileIDSlow(unsigned SLocOffset) const {
assert(SLocOffset && "Invalid FileID");
// After the first and second level caches, I see two common sorts of
// behavior: 1) a lot of searched FileID's are "near" the cached file location
// or are "near" the cached instantiation location. 2) others are just
// completely random and may be a very long way away.
//
// To handle this, we do a linear search for up to 8 steps to catch #1 quickly
// then we fall back to a less cache efficient, but more scalable, binary
// search to find the location.
// See if this is near the file point - worst case we start scanning from the
// most newly created FileID.
std::vector<SrcMgr::SLocEntry>::const_iterator I;
if (SLocEntryTable[LastFileIDLookup.ID].getOffset() < SLocOffset) {
// Neither loc prunes our search.
I = SLocEntryTable.end();
} else {
// Perhaps it is near the file point.
I = SLocEntryTable.begin()+LastFileIDLookup.ID;
}
// Find the FileID that contains this. "I" is an iterator that points to a
// FileID whose offset is known to be larger than SLocOffset.
unsigned NumProbes = 0;
while (1) {
--I;
if (ExternalSLocEntries)
getSLocEntry(FileID::get(I - SLocEntryTable.begin()));
if (I->getOffset() <= SLocOffset) {
#if 0
printf("lin %d -> %d [%s] %d %d\n", SLocOffset,
I-SLocEntryTable.begin(),
I->isInstantiation() ? "inst" : "file",
LastFileIDLookup.ID, int(SLocEntryTable.end()-I));
#endif
FileID Res = FileID::get(I-SLocEntryTable.begin());
// If this isn't an instantiation, remember it. We have good locality
// across FileID lookups.
if (!I->isInstantiation())
LastFileIDLookup = Res;
NumLinearScans += NumProbes+1;
return Res;
}
if (++NumProbes == 8)
break;
}
// Convert "I" back into an index. We know that it is an entry whose index is
// larger than the offset we are looking for.
unsigned GreaterIndex = I-SLocEntryTable.begin();
// LessIndex - This is the lower bound of the range that we're searching.
// We know that the offset corresponding to the FileID is is less than
// SLocOffset.
unsigned LessIndex = 0;
NumProbes = 0;
while (1) {
unsigned MiddleIndex = (GreaterIndex-LessIndex)/2+LessIndex;
unsigned MidOffset = getSLocEntry(FileID::get(MiddleIndex)).getOffset();
++NumProbes;
// If the offset of the midpoint is too large, chop the high side of the
// range to the midpoint.
if (MidOffset > SLocOffset) {
GreaterIndex = MiddleIndex;
continue;
}
// If the middle index contains the value, succeed and return.
if (isOffsetInFileID(FileID::get(MiddleIndex), SLocOffset)) {
#if 0
printf("bin %d -> %d [%s] %d %d\n", SLocOffset,
I-SLocEntryTable.begin(),
I->isInstantiation() ? "inst" : "file",
LastFileIDLookup.ID, int(SLocEntryTable.end()-I));
#endif
FileID Res = FileID::get(MiddleIndex);
// If this isn't an instantiation, remember it. We have good locality
// across FileID lookups.
if (!I->isInstantiation())
LastFileIDLookup = Res;
NumBinaryProbes += NumProbes;
return Res;
}
// Otherwise, move the low-side up to the middle index.
LessIndex = MiddleIndex;
}
}
SourceLocation SourceManager::
getInstantiationLocSlowCase(SourceLocation Loc) const {
do {
// Note: If Loc indicates an offset into a token that came from a macro
// expansion (e.g. the 5th character of the token) we do not want to add
// this offset when going to the instantiation location. The instatiation
// location is the macro invocation, which the offset has nothing to do
// with. This is unlike when we get the spelling loc, because the offset
// directly correspond to the token whose spelling we're inspecting.
Loc = getSLocEntry(getFileID(Loc)).getInstantiation()
.getInstantiationLocStart();
} while (!Loc.isFileID());
return Loc;
}
SourceLocation SourceManager::getSpellingLocSlowCase(SourceLocation Loc) const {
do {
std::pair<FileID, unsigned> LocInfo = getDecomposedLoc(Loc);
Loc = getSLocEntry(LocInfo.first).getInstantiation().getSpellingLoc();
Loc = Loc.getFileLocWithOffset(LocInfo.second);
} while (!Loc.isFileID());
return Loc;
}
std::pair<FileID, unsigned>
SourceManager::getDecomposedInstantiationLocSlowCase(const SrcMgr::SLocEntry *E,
unsigned Offset) const {
// If this is an instantiation record, walk through all the instantiation
// points.
FileID FID;
SourceLocation Loc;
do {
Loc = E->getInstantiation().getInstantiationLocStart();
FID = getFileID(Loc);
E = &getSLocEntry(FID);
Offset += Loc.getOffset()-E->getOffset();
} while (!Loc.isFileID());
return std::make_pair(FID, Offset);
}
std::pair<FileID, unsigned>
SourceManager::getDecomposedSpellingLocSlowCase(const SrcMgr::SLocEntry *E,
unsigned Offset) const {
// If this is an instantiation record, walk through all the instantiation
// points.
FileID FID;
SourceLocation Loc;
do {
Loc = E->getInstantiation().getSpellingLoc();
FID = getFileID(Loc);
E = &getSLocEntry(FID);
Offset += Loc.getOffset()-E->getOffset();
} while (!Loc.isFileID());
return std::make_pair(FID, Offset);
}
/// getImmediateSpellingLoc - Given a SourceLocation object, return the
/// spelling location referenced by the ID. This is the first level down
/// towards the place where the characters that make up the lexed token can be
/// found. This should not generally be used by clients.
SourceLocation SourceManager::getImmediateSpellingLoc(SourceLocation Loc) const{
if (Loc.isFileID()) return Loc;
std::pair<FileID, unsigned> LocInfo = getDecomposedLoc(Loc);
Loc = getSLocEntry(LocInfo.first).getInstantiation().getSpellingLoc();
return Loc.getFileLocWithOffset(LocInfo.second);
}
/// getImmediateInstantiationRange - Loc is required to be an instantiation
/// location. Return the start/end of the instantiation information.
std::pair<SourceLocation,SourceLocation>
SourceManager::getImmediateInstantiationRange(SourceLocation Loc) const {
assert(Loc.isMacroID() && "Not an instantiation loc!");
const InstantiationInfo &II = getSLocEntry(getFileID(Loc)).getInstantiation();
return II.getInstantiationLocRange();
}
/// getInstantiationRange - Given a SourceLocation object, return the
/// range of tokens covered by the instantiation in the ultimate file.
std::pair<SourceLocation,SourceLocation>
SourceManager::getInstantiationRange(SourceLocation Loc) const {
if (Loc.isFileID()) return std::make_pair(Loc, Loc);
std::pair<SourceLocation,SourceLocation> Res =
getImmediateInstantiationRange(Loc);
// Fully resolve the start and end locations to their ultimate instantiation
// points.
while (!Res.first.isFileID())
Res.first = getImmediateInstantiationRange(Res.first).first;
while (!Res.second.isFileID())
Res.second = getImmediateInstantiationRange(Res.second).second;
return Res;
}
//===----------------------------------------------------------------------===//
// Queries about the code at a SourceLocation.
//===----------------------------------------------------------------------===//
/// getCharacterData - Return a pointer to the start of the specified location
/// in the appropriate MemoryBuffer.
const char *SourceManager::getCharacterData(SourceLocation SL,
bool *Invalid) const {
// Note that this is a hot function in the getSpelling() path, which is
// heavily used by -E mode.
std::pair<FileID, unsigned> LocInfo = getDecomposedSpellingLoc(SL);
// Note that calling 'getBuffer()' may lazily page in a source file.
bool CharDataInvalid = false;
const llvm::MemoryBuffer *Buffer
= getSLocEntry(LocInfo.first).getFile().getContentCache()->getBuffer(Diag,
&CharDataInvalid);
if (Invalid)
*Invalid = CharDataInvalid;
return Buffer->getBufferStart() + (CharDataInvalid? 0 : LocInfo.second);
}
/// getColumnNumber - Return the column # for the specified file position.
/// this is significantly cheaper to compute than the line number.
unsigned SourceManager::getColumnNumber(FileID FID, unsigned FilePos,
bool *Invalid) const {
bool MyInvalid = false;
const char *Buf = getBuffer(FID, &MyInvalid)->getBufferStart();
if (Invalid)
*Invalid = MyInvalid;
if (MyInvalid)
return 1;
unsigned LineStart = FilePos;
while (LineStart && Buf[LineStart-1] != '\n' && Buf[LineStart-1] != '\r')
--LineStart;
return FilePos-LineStart+1;
}
unsigned SourceManager::getSpellingColumnNumber(SourceLocation Loc,
bool *Invalid) const {
if (Loc.isInvalid()) return 0;
std::pair<FileID, unsigned> LocInfo = getDecomposedSpellingLoc(Loc);
return getColumnNumber(LocInfo.first, LocInfo.second, Invalid);
}
unsigned SourceManager::getInstantiationColumnNumber(SourceLocation Loc,
bool *Invalid) const {
if (Loc.isInvalid()) return 0;
std::pair<FileID, unsigned> LocInfo = getDecomposedInstantiationLoc(Loc);
return getColumnNumber(LocInfo.first, LocInfo.second, Invalid);
}
static DISABLE_INLINE void ComputeLineNumbers(Diagnostic &Diag,
ContentCache* FI,
llvm::BumpPtrAllocator &Alloc,
bool &Invalid);
static void ComputeLineNumbers(Diagnostic &Diag, ContentCache* FI,
llvm::BumpPtrAllocator &Alloc, bool &Invalid) {
// Note that calling 'getBuffer()' may lazily page in the file.
const MemoryBuffer *Buffer = FI->getBuffer(Diag, &Invalid);
if (Invalid)
return;
// Find the file offsets of all of the *physical* source lines. This does
// not look at trigraphs, escaped newlines, or anything else tricky.
std::vector<unsigned> LineOffsets;
// Line #1 starts at char 0.
LineOffsets.push_back(0);
const unsigned char *Buf = (const unsigned char *)Buffer->getBufferStart();
const unsigned char *End = (const unsigned char *)Buffer->getBufferEnd();
unsigned Offs = 0;
while (1) {
// Skip over the contents of the line.
// TODO: Vectorize this? This is very performance sensitive for programs
// with lots of diagnostics and in -E mode.
const unsigned char *NextBuf = (const unsigned char *)Buf;
while (*NextBuf != '\n' && *NextBuf != '\r' && *NextBuf != '\0')
++NextBuf;
Offs += NextBuf-Buf;
Buf = NextBuf;
if (Buf[0] == '\n' || Buf[0] == '\r') {
// If this is \n\r or \r\n, skip both characters.
if ((Buf[1] == '\n' || Buf[1] == '\r') && Buf[0] != Buf[1])
++Offs, ++Buf;
++Offs, ++Buf;
LineOffsets.push_back(Offs);
} else {
// Otherwise, this is a null. If end of file, exit.
if (Buf == End) break;
// Otherwise, skip the null.
++Offs, ++Buf;
}
}
// Copy the offsets into the FileInfo structure.
FI->NumLines = LineOffsets.size();
FI->SourceLineCache = Alloc.Allocate<unsigned>(LineOffsets.size());
std::copy(LineOffsets.begin(), LineOffsets.end(), FI->SourceLineCache);
}
/// getLineNumber - Given a SourceLocation, return the spelling line number
/// for the position indicated. This requires building and caching a table of
/// line offsets for the MemoryBuffer, so this is not cheap: use only when
/// about to emit a diagnostic.
unsigned SourceManager::getLineNumber(FileID FID, unsigned FilePos,
bool *Invalid) const {
ContentCache *Content;
if (LastLineNoFileIDQuery == FID)
Content = LastLineNoContentCache;
else
Content = const_cast<ContentCache*>(getSLocEntry(FID)
.getFile().getContentCache());
// If this is the first use of line information for this buffer, compute the
/// SourceLineCache for it on demand.
if (Content->SourceLineCache == 0) {
bool MyInvalid = false;
ComputeLineNumbers(Diag, Content, ContentCacheAlloc, MyInvalid);
if (Invalid)
*Invalid = MyInvalid;
if (MyInvalid)
return 1;
} else if (Invalid)
*Invalid = false;
// Okay, we know we have a line number table. Do a binary search to find the
// line number that this character position lands on.
unsigned *SourceLineCache = Content->SourceLineCache;
unsigned *SourceLineCacheStart = SourceLineCache;
unsigned *SourceLineCacheEnd = SourceLineCache + Content->NumLines;
unsigned QueriedFilePos = FilePos+1;
// FIXME: I would like to be convinced that this code is worth being as
// complicated as it is, binary search isn't that slow.
//
// If it is worth being optimized, then in my opinion it could be more
// performant, simpler, and more obviously correct by just "galloping" outward
// from the queried file position. In fact, this could be incorporated into a
// generic algorithm such as lower_bound_with_hint.
//
// If someone gives me a test case where this matters, and I will do it! - DWD
// If the previous query was to the same file, we know both the file pos from
// that query and the line number returned. This allows us to narrow the
// search space from the entire file to something near the match.
if (LastLineNoFileIDQuery == FID) {
if (QueriedFilePos >= LastLineNoFilePos) {
// FIXME: Potential overflow?
SourceLineCache = SourceLineCache+LastLineNoResult-1;
// The query is likely to be nearby the previous one. Here we check to
// see if it is within 5, 10 or 20 lines. It can be far away in cases
// where big comment blocks and vertical whitespace eat up lines but
// contribute no tokens.
if (SourceLineCache+5 < SourceLineCacheEnd) {
if (SourceLineCache[5] > QueriedFilePos)
SourceLineCacheEnd = SourceLineCache+5;
else if (SourceLineCache+10 < SourceLineCacheEnd) {
if (SourceLineCache[10] > QueriedFilePos)
SourceLineCacheEnd = SourceLineCache+10;
else if (SourceLineCache+20 < SourceLineCacheEnd) {
if (SourceLineCache[20] > QueriedFilePos)
SourceLineCacheEnd = SourceLineCache+20;
}
}
}
} else {
if (LastLineNoResult < Content->NumLines)
SourceLineCacheEnd = SourceLineCache+LastLineNoResult+1;
}
}
// If the spread is large, do a "radix" test as our initial guess, based on
// the assumption that lines average to approximately the same length.
// NOTE: This is currently disabled, as it does not appear to be profitable in
// initial measurements.
if (0 && SourceLineCacheEnd-SourceLineCache > 20) {
unsigned FileLen = Content->SourceLineCache[Content->NumLines-1];
// Take a stab at guessing where it is.
unsigned ApproxPos = Content->NumLines*QueriedFilePos / FileLen;
// Check for -10 and +10 lines.
unsigned LowerBound = std::max(int(ApproxPos-10), 0);
unsigned UpperBound = std::min(ApproxPos+10, FileLen);
// If the computed lower bound is less than the query location, move it in.
if (SourceLineCache < SourceLineCacheStart+LowerBound &&
SourceLineCacheStart[LowerBound] < QueriedFilePos)
SourceLineCache = SourceLineCacheStart+LowerBound;
// If the computed upper bound is greater than the query location, move it.
if (SourceLineCacheEnd > SourceLineCacheStart+UpperBound &&
SourceLineCacheStart[UpperBound] >= QueriedFilePos)
SourceLineCacheEnd = SourceLineCacheStart+UpperBound;
}
unsigned *Pos
= std::lower_bound(SourceLineCache, SourceLineCacheEnd, QueriedFilePos);
unsigned LineNo = Pos-SourceLineCacheStart;
LastLineNoFileIDQuery = FID;
LastLineNoContentCache = Content;
LastLineNoFilePos = QueriedFilePos;
LastLineNoResult = LineNo;
return LineNo;
}
unsigned SourceManager::getInstantiationLineNumber(SourceLocation Loc,
bool *Invalid) const {
if (Loc.isInvalid()) return 0;
std::pair<FileID, unsigned> LocInfo = getDecomposedInstantiationLoc(Loc);
return getLineNumber(LocInfo.first, LocInfo.second);
}
unsigned SourceManager::getSpellingLineNumber(SourceLocation Loc,
bool *Invalid) const {
if (Loc.isInvalid()) return 0;
std::pair<FileID, unsigned> LocInfo = getDecomposedSpellingLoc(Loc);
return getLineNumber(LocInfo.first, LocInfo.second);
}
/// getFileCharacteristic - return the file characteristic of the specified
/// source location, indicating whether this is a normal file, a system
/// header, or an "implicit extern C" system header.
///
/// This state can be modified with flags on GNU linemarker directives like:
/// # 4 "foo.h" 3
/// which changes all source locations in the current file after that to be
/// considered to be from a system header.
SrcMgr::CharacteristicKind
SourceManager::getFileCharacteristic(SourceLocation Loc) const {
assert(!Loc.isInvalid() && "Can't get file characteristic of invalid loc!");
std::pair<FileID, unsigned> LocInfo = getDecomposedInstantiationLoc(Loc);
const SrcMgr::FileInfo &FI = getSLocEntry(LocInfo.first).getFile();
// If there are no #line directives in this file, just return the whole-file
// state.
if (!FI.hasLineDirectives())
return FI.getFileCharacteristic();
assert(LineTable && "Can't have linetable entries without a LineTable!");
// See if there is a #line directive before the location.
const LineEntry *Entry =
LineTable->FindNearestLineEntry(LocInfo.first.ID, LocInfo.second);
// If this is before the first line marker, use the file characteristic.
if (!Entry)
return FI.getFileCharacteristic();
return Entry->FileKind;
}
/// Return the filename or buffer identifier of the buffer the location is in.
/// Note that this name does not respect #line directives. Use getPresumedLoc
/// for normal clients.
const char *SourceManager::getBufferName(SourceLocation Loc,
bool *Invalid) const {
if (Loc.isInvalid()) return "<invalid loc>";
return getBuffer(getFileID(Loc), Invalid)->getBufferIdentifier();
}
/// getPresumedLoc - This method returns the "presumed" location of a
/// SourceLocation specifies. A "presumed location" can be modified by #line
/// or GNU line marker directives. This provides a view on the data that a
/// user should see in diagnostics, for example.
///
/// Note that a presumed location is always given as the instantiation point
/// of an instantiation location, not at the spelling location.
PresumedLoc SourceManager::getPresumedLoc(SourceLocation Loc) const {
if (Loc.isInvalid()) return PresumedLoc();
// Presumed locations are always for instantiation points.
std::pair<FileID, unsigned> LocInfo = getDecomposedInstantiationLoc(Loc);
const SrcMgr::FileInfo &FI = getSLocEntry(LocInfo.first).getFile();
const SrcMgr::ContentCache *C = FI.getContentCache();
// To get the source name, first consult the FileEntry (if one exists)
// before the MemBuffer as this will avoid unnecessarily paging in the
// MemBuffer.
const char *Filename =
C->Entry ? C->Entry->getName() : C->getBuffer(Diag)->getBufferIdentifier();
unsigned LineNo = getLineNumber(LocInfo.first, LocInfo.second);
unsigned ColNo = getColumnNumber(LocInfo.first, LocInfo.second);
SourceLocation IncludeLoc = FI.getIncludeLoc();
// If we have #line directives in this file, update and overwrite the physical
// location info if appropriate.
if (FI.hasLineDirectives()) {
assert(LineTable && "Can't have linetable entries without a LineTable!");
// See if there is a #line directive before this. If so, get it.
if (const LineEntry *Entry =
LineTable->FindNearestLineEntry(LocInfo.first.ID, LocInfo.second)) {
// If the LineEntry indicates a filename, use it.
if (Entry->FilenameID != -1)
Filename = LineTable->getFilename(Entry->FilenameID);
// Use the line number specified by the LineEntry. This line number may
// be multiple lines down from the line entry. Add the difference in
// physical line numbers from the query point and the line marker to the
// total.
unsigned MarkerLineNo = getLineNumber(LocInfo.first, Entry->FileOffset);
LineNo = Entry->LineNo + (LineNo-MarkerLineNo-1);
// Note that column numbers are not molested by line markers.
// Handle virtual #include manipulation.
if (Entry->IncludeOffset) {
IncludeLoc = getLocForStartOfFile(LocInfo.first);
IncludeLoc = IncludeLoc.getFileLocWithOffset(Entry->IncludeOffset);
}
}
}
return PresumedLoc(Filename, LineNo, ColNo, IncludeLoc);
}
//===----------------------------------------------------------------------===//
// Other miscellaneous methods.
//===----------------------------------------------------------------------===//
/// \brief Get the source location for the given file:line:col triplet.
///
/// If the source file is included multiple times, the source location will
/// be based upon the first inclusion.
SourceLocation SourceManager::getLocation(const FileEntry *SourceFile,
unsigned Line, unsigned Col) const {
assert(SourceFile && "Null source file!");
assert(Line && Col && "Line and column should start from 1!");
fileinfo_iterator FI = FileInfos.find(SourceFile);
if (FI == FileInfos.end())
return SourceLocation();
ContentCache *Content = FI->second;
// If this is the first use of line information for this buffer, compute the
/// SourceLineCache for it on demand.
if (Content->SourceLineCache == 0) {
bool MyInvalid = false;
ComputeLineNumbers(Diag, Content, ContentCacheAlloc, MyInvalid);
if (MyInvalid)
return SourceLocation();
}
// Find the first file ID that corresponds to the given file.
FileID FirstFID;
// First, check the main file ID, since it is common to look for a
// location in the main file.
if (!MainFileID.isInvalid()) {
const SLocEntry &MainSLoc = getSLocEntry(MainFileID);
if (MainSLoc.isFile() && MainSLoc.getFile().getContentCache() == Content)
FirstFID = MainFileID;
}
if (FirstFID.isInvalid()) {
// The location we're looking for isn't in the main file; look
// through all of the source locations.
for (unsigned I = 0, N = sloc_entry_size(); I != N; ++I) {
const SLocEntry &SLoc = getSLocEntry(I);
if (SLoc.isFile() && SLoc.getFile().getContentCache() == Content) {
FirstFID = FileID::get(I);
break;
}
}
}
if (FirstFID.isInvalid())
return SourceLocation();
if (Line > Content->NumLines) {
unsigned Size = Content->getBuffer(Diag)->getBufferSize();
if (Size > 0)
--Size;
return getLocForStartOfFile(FirstFID).getFileLocWithOffset(Size);
}
unsigned FilePos = Content->SourceLineCache[Line - 1];
const char *Buf = Content->getBuffer(Diag)->getBufferStart() + FilePos;
unsigned BufLength = Content->getBuffer(Diag)->getBufferEnd() - Buf;
unsigned i = 0;
// Check that the given column is valid.
while (i < BufLength-1 && i < Col-1 && Buf[i] != '\n' && Buf[i] != '\r')
++i;
if (i < Col-1)
return getLocForStartOfFile(FirstFID).getFileLocWithOffset(FilePos + i);
return getLocForStartOfFile(FirstFID).getFileLocWithOffset(FilePos + Col - 1);
}
/// \brief Determines the order of 2 source locations in the translation unit.
///
/// \returns true if LHS source location comes before RHS, false otherwise.
bool SourceManager::isBeforeInTranslationUnit(SourceLocation LHS,
SourceLocation RHS) const {
assert(LHS.isValid() && RHS.isValid() && "Passed invalid source location!");
if (LHS == RHS)
return false;
std::pair<FileID, unsigned> LOffs = getDecomposedLoc(LHS);
std::pair<FileID, unsigned> ROffs = getDecomposedLoc(RHS);
// If the source locations are in the same file, just compare offsets.
if (LOffs.first == ROffs.first)
return LOffs.second < ROffs.second;
// If we are comparing a source location with multiple locations in the same
// file, we get a big win by caching the result.
if (LastLFIDForBeforeTUCheck == LOffs.first &&
LastRFIDForBeforeTUCheck == ROffs.first)
return LastResForBeforeTUCheck;
LastLFIDForBeforeTUCheck = LOffs.first;
LastRFIDForBeforeTUCheck = ROffs.first;
// "Traverse" the include/instantiation stacks of both locations and try to
// find a common "ancestor".
//
// First we traverse the stack of the right location and check each level
// against the level of the left location, while collecting all levels in a
// "stack map".
std::map<FileID, unsigned> ROffsMap;
ROffsMap[ROffs.first] = ROffs.second;
while (1) {
SourceLocation UpperLoc;
const SrcMgr::SLocEntry &Entry = getSLocEntry(ROffs.first);
if (Entry.isInstantiation())
UpperLoc = Entry.getInstantiation().getInstantiationLocStart();
else
UpperLoc = Entry.getFile().getIncludeLoc();
if (UpperLoc.isInvalid())
break; // We reached the top.
ROffs = getDecomposedLoc(UpperLoc);
if (LOffs.first == ROffs.first)
return LastResForBeforeTUCheck = LOffs.second < ROffs.second;
ROffsMap[ROffs.first] = ROffs.second;
}
// We didn't find a common ancestor. Now traverse the stack of the left
// location, checking against the stack map of the right location.
while (1) {
SourceLocation UpperLoc;
const SrcMgr::SLocEntry &Entry = getSLocEntry(LOffs.first);
if (Entry.isInstantiation())
UpperLoc = Entry.getInstantiation().getInstantiationLocStart();
else
UpperLoc = Entry.getFile().getIncludeLoc();
if (UpperLoc.isInvalid())
break; // We reached the top.
LOffs = getDecomposedLoc(UpperLoc);
std::map<FileID, unsigned>::iterator I = ROffsMap.find(LOffs.first);
if (I != ROffsMap.end())
return LastResForBeforeTUCheck = LOffs.second < I->second;
}
// There is no common ancestor, most probably because one location is in the
// predefines buffer.
//
// FIXME: We should rearrange the external interface so this simply never
// happens; it can't conceptually happen. Also see PR5662.
// If exactly one location is a memory buffer, assume it preceeds the other.
bool LIsMB = !getSLocEntry(LOffs.first).getFile().getContentCache()->Entry;
bool RIsMB = !getSLocEntry(ROffs.first).getFile().getContentCache()->Entry;
if (LIsMB != RIsMB)
return LastResForBeforeTUCheck = LIsMB;
// Otherwise, just assume FileIDs were created in order.
return LastResForBeforeTUCheck = (LOffs.first < ROffs.first);
}
/// PrintStats - Print statistics to stderr.
///
void SourceManager::PrintStats() const {
llvm::errs() << "\n*** Source Manager Stats:\n";
llvm::errs() << FileInfos.size() << " files mapped, " << MemBufferInfos.size()
<< " mem buffers mapped.\n";
llvm::errs() << SLocEntryTable.size() << " SLocEntry's allocated, "
<< NextOffset << "B of Sloc address space used.\n";
unsigned NumLineNumsComputed = 0;
unsigned NumFileBytesMapped = 0;
for (fileinfo_iterator I = fileinfo_begin(), E = fileinfo_end(); I != E; ++I){
NumLineNumsComputed += I->second->SourceLineCache != 0;
NumFileBytesMapped += I->second->getSizeBytesMapped();
}
llvm::errs() << NumFileBytesMapped << " bytes of files mapped, "
<< NumLineNumsComputed << " files with line #'s computed.\n";
llvm::errs() << "FileID scans: " << NumLinearScans << " linear, "
<< NumBinaryProbes << " binary.\n";
}
ExternalSLocEntrySource::~ExternalSLocEntrySource() { }
|