llvm.org GIT mirror llvm / 15c435a lib / IR / GCOV.cpp
15c435a

Tree @15c435a (Download .tar.gz)

GCOV.cpp @15c435araw · history · blame

  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
//===- GCOV.cpp - LLVM coverage tool --------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// GCOV implements the interface to read and write coverage files that use
// 'gcov' format.
//
//===----------------------------------------------------------------------===//

#include "llvm/Support/GCOV.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/MemoryObject.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/system_error.h"
#include <algorithm>
using namespace llvm;

//===----------------------------------------------------------------------===//
// GCOVFile implementation.

/// ~GCOVFile - Delete GCOVFile and its content.
GCOVFile::~GCOVFile() {
  DeleteContainerPointers(Functions);
}

/// readGCNO - Read GCNO buffer.
bool GCOVFile::readGCNO(GCOVBuffer &Buffer) {
  if (!Buffer.readGCNOFormat()) return false;
  if (!Buffer.readGCOVVersion(Version)) return false;

  if (!Buffer.readInt(Checksum)) return false;
  while (true) {
    if (!Buffer.readFunctionTag()) break;
    GCOVFunction *GFun = new GCOVFunction(*this);
    if (!GFun->readGCNO(Buffer, Version))
      return false;
    Functions.push_back(GFun);
  }

  GCNOInitialized = true;
  return true;
}

/// readGCDA - Read GCDA buffer. It is required that readGCDA() can only be
/// called after readGCNO().
bool GCOVFile::readGCDA(GCOVBuffer &Buffer) {
  assert(GCNOInitialized && "readGCDA() can only be called after readGCNO()");
  if (!Buffer.readGCDAFormat()) return false;
  GCOV::GCOVVersion GCDAVersion;
  if (!Buffer.readGCOVVersion(GCDAVersion)) return false;
  if (Version != GCDAVersion) {
    errs() << "GCOV versions do not match.\n";
    return false;
  }

  uint32_t GCDAChecksum;
  if (!Buffer.readInt(GCDAChecksum)) return false;
  if (Checksum != GCDAChecksum) {
    errs() << "File checksums do not match: " << Checksum << " != "
           << GCDAChecksum << ".\n";
    return false;
  }
  for (size_t i = 0, e = Functions.size(); i < e; ++i) {
    if (!Buffer.readFunctionTag()) {
      errs() << "Unexpected number of functions.\n";
      return false;
    }
    if (!Functions[i]->readGCDA(Buffer, Version))
      return false;
  }
  if (Buffer.readObjectTag()) {
    uint32_t Length;
    uint32_t Dummy;
    if (!Buffer.readInt(Length)) return false;
    if (!Buffer.readInt(Dummy)) return false; // checksum
    if (!Buffer.readInt(Dummy)) return false; // num
    if (!Buffer.readInt(RunCount)) return false;
    Buffer.advanceCursor(Length-3);
  }
  while (Buffer.readProgramTag()) {
    uint32_t Length;
    if (!Buffer.readInt(Length)) return false;
    Buffer.advanceCursor(Length);
    ++ProgramCount;
  }

  return true;
}

/// dump - Dump GCOVFile content to dbgs() for debugging purposes.
void GCOVFile::dump() const {
  for (SmallVectorImpl<GCOVFunction *>::const_iterator I = Functions.begin(),
         E = Functions.end(); I != E; ++I)
    (*I)->dump();
}

/// collectLineCounts - Collect line counts. This must be used after
/// reading .gcno and .gcda files.
void GCOVFile::collectLineCounts(FileInfo &FI) {
  for (SmallVectorImpl<GCOVFunction *>::iterator I = Functions.begin(),
         E = Functions.end(); I != E; ++I)
    (*I)->collectLineCounts(FI);
  FI.setRunCount(RunCount);
  FI.setProgramCount(ProgramCount);
}

//===----------------------------------------------------------------------===//
// GCOVFunction implementation.

/// ~GCOVFunction - Delete GCOVFunction and its content.
GCOVFunction::~GCOVFunction() {
  DeleteContainerPointers(Blocks);
  DeleteContainerPointers(Edges);
}

/// readGCNO - Read a function from the GCNO buffer. Return false if an error
/// occurs.
bool GCOVFunction::readGCNO(GCOVBuffer &Buff, GCOV::GCOVVersion Version) {
  uint32_t Dummy;
  if (!Buff.readInt(Dummy)) return false; // Function header length
  if (!Buff.readInt(Ident)) return false;
  if (!Buff.readInt(Checksum)) return false;
  if (Version != GCOV::V402) {
    uint32_t CfgChecksum;
    if (!Buff.readInt(CfgChecksum)) return false;
    if (Parent.getChecksum() != CfgChecksum) {
      errs() << "File checksums do not match: " << Parent.getChecksum()
             << " != " << CfgChecksum << " in (" << Name << ").\n";
      return false;
    }
  }
  if (!Buff.readString(Name)) return false;
  if (!Buff.readString(Filename)) return false;
  if (!Buff.readInt(LineNumber)) return false;

  // read blocks.
  if (!Buff.readBlockTag()) {
    errs() << "Block tag not found.\n";
    return false;
  }
  uint32_t BlockCount;
  if (!Buff.readInt(BlockCount)) return false;
  for (uint32_t i = 0, e = BlockCount; i != e; ++i) {
    if (!Buff.readInt(Dummy)) return false; // Block flags;
    Blocks.push_back(new GCOVBlock(*this, i));
  }

  // read edges.
  while (Buff.readEdgeTag()) {
    uint32_t EdgeCount;
    if (!Buff.readInt(EdgeCount)) return false;
    EdgeCount = (EdgeCount - 1) / 2;
    uint32_t BlockNo;
    if (!Buff.readInt(BlockNo)) return false;
    if (BlockNo >= BlockCount) {
      errs() << "Unexpected block number: " << BlockNo << " (in " << Name
             << ").\n";
      return false;
    }
    for (uint32_t i = 0, e = EdgeCount; i != e; ++i) {
      uint32_t Dst;
      if (!Buff.readInt(Dst)) return false;
      GCOVEdge *Edge = new GCOVEdge(Blocks[BlockNo], Blocks[Dst]);
      Edges.push_back(Edge);
      Blocks[BlockNo]->addDstEdge(Edge);
      Blocks[Dst]->addSrcEdge(Edge);
      if (!Buff.readInt(Dummy)) return false; // Edge flag
    }
  }

  // read line table.
  while (Buff.readLineTag()) {
    uint32_t LineTableLength;
    if (!Buff.readInt(LineTableLength)) return false;
    uint32_t EndPos = Buff.getCursor() + LineTableLength*4;
    uint32_t BlockNo;
    if (!Buff.readInt(BlockNo)) return false;
    if (BlockNo >= BlockCount) {
      errs() << "Unexpected block number: " << BlockNo << " (in " << Name
             << ").\n";
      return false;
    }
    GCOVBlock *Block = Blocks[BlockNo];
    if (!Buff.readInt(Dummy)) return false; // flag
    while (Buff.getCursor() != (EndPos - 4)) {
      StringRef F;
      if (!Buff.readString(F)) return false;
      if (Filename != F) {
        errs() << "Multiple sources for a single basic block: " << Filename
               << " != " << F << " (in " << Name << ").\n";
        return false;
      }
      if (Buff.getCursor() == (EndPos - 4)) break;
      while (true) {
        uint32_t Line;
        if (!Buff.readInt(Line)) return false;
        if (!Line) break;
        Block->addLine(Line);
      }
    }
    if (!Buff.readInt(Dummy)) return false; // flag
  }
  return true;
}

/// readGCDA - Read a function from the GCDA buffer. Return false if an error
/// occurs.
bool GCOVFunction::readGCDA(GCOVBuffer &Buff, GCOV::GCOVVersion Version) {
  uint32_t Dummy;
  if (!Buff.readInt(Dummy)) return false; // Function header length

  uint32_t GCDAIdent;
  if (!Buff.readInt(GCDAIdent)) return false;
  if (Ident != GCDAIdent) {
    errs() << "Function identifiers do not match: " << Ident << " != "
           << GCDAIdent << " (in " << Name << ").\n";
    return false;
  }

  uint32_t GCDAChecksum;
  if (!Buff.readInt(GCDAChecksum)) return false;
  if (Checksum != GCDAChecksum) {
    errs() << "Function checksums do not match: " << Checksum << " != "
           << GCDAChecksum << " (in " << Name << ").\n";
    return false;
  }

  uint32_t CfgChecksum;
  if (Version != GCOV::V402) {
    if (!Buff.readInt(CfgChecksum)) return false;
    if (Parent.getChecksum() != CfgChecksum) {
      errs() << "File checksums do not match: " << Parent.getChecksum()
             << " != " << CfgChecksum << " (in " << Name << ").\n";
      return false;
    }
  }

  StringRef GCDAName;
  if (!Buff.readString(GCDAName)) return false;
  if (Name != GCDAName) {
    errs() << "Function names do not match: " << Name << " != " << GCDAName
           << ".\n";
    return false;
  }

  if (!Buff.readArcTag()) {
    errs() << "Arc tag not found (in " << Name << ").\n";
    return false;
  }

  uint32_t Count;
  if (!Buff.readInt(Count)) return false;
  Count /= 2;

  // This for loop adds the counts for each block. A second nested loop is
  // required to combine the edge counts that are contained in the GCDA file.
  for (uint32_t BlockNo = 0; Count > 0; ++BlockNo) {
    // The last block is always reserved for exit block
    if (BlockNo >= Blocks.size()-1) {
      errs() << "Unexpected number of edges (in " << Name << ").\n";
      return false;
    }
    GCOVBlock &Block = *Blocks[BlockNo];
    for (size_t EdgeNo = 0, End = Block.getNumDstEdges(); EdgeNo < End;
           ++EdgeNo) {
      if (Count == 0) {
        errs() << "Unexpected number of edges (in " << Name << ").\n";
        return false;
      }
      uint64_t ArcCount;
      if (!Buff.readInt64(ArcCount)) return false;
      Block.addCount(EdgeNo, ArcCount);
      --Count;
    }
    Block.sortDstEdges();
  }
  return true;
}

/// getEntryCount - Get the number of times the function was called by
/// retrieving the entry block's count.
uint64_t GCOVFunction::getEntryCount() const {
  return Blocks.front()->getCount();
}

/// getExitCount - Get the number of times the function returned by retrieving
/// the exit block's count.
uint64_t GCOVFunction::getExitCount() const {
  return Blocks.back()->getCount();
}

/// dump - Dump GCOVFunction content to dbgs() for debugging purposes.
void GCOVFunction::dump() const {
  dbgs() <<  "===== " << Name << " @ " << Filename << ":" << LineNumber << "\n";
  for (SmallVectorImpl<GCOVBlock *>::const_iterator I = Blocks.begin(),
         E = Blocks.end(); I != E; ++I)
    (*I)->dump();
}

/// collectLineCounts - Collect line counts. This must be used after
/// reading .gcno and .gcda files.
void GCOVFunction::collectLineCounts(FileInfo &FI) {
  // If the line number is zero, this is a function that doesn't actually appear
  // in the source file, so there isn't anything we can do with it.
  if (LineNumber == 0)
    return;

  for (SmallVectorImpl<GCOVBlock *>::iterator I = Blocks.begin(),
         E = Blocks.end(); I != E; ++I)
    (*I)->collectLineCounts(FI);
  FI.addFunctionLine(Filename, LineNumber, this);
}

//===----------------------------------------------------------------------===//
// GCOVBlock implementation.

/// ~GCOVBlock - Delete GCOVBlock and its content.
GCOVBlock::~GCOVBlock() {
  SrcEdges.clear();
  DstEdges.clear();
  Lines.clear();
}

/// addCount - Add to block counter while storing the edge count. If the
/// destination has no outgoing edges, also update that block's count too.
void GCOVBlock::addCount(size_t DstEdgeNo, uint64_t N) {
  assert(DstEdgeNo < DstEdges.size()); // up to caller to ensure EdgeNo is valid
  DstEdges[DstEdgeNo]->Count = N;
  Counter += N;
  if (!DstEdges[DstEdgeNo]->Dst->getNumDstEdges())
    DstEdges[DstEdgeNo]->Dst->Counter += N;
}

/// sortDstEdges - Sort destination edges by block number, nop if already
/// sorted. This is required for printing branch info in the correct order.
void GCOVBlock::sortDstEdges() {
  if (!DstEdgesAreSorted) {
    SortDstEdgesFunctor SortEdges;
    std::stable_sort(DstEdges.begin(), DstEdges.end(), SortEdges);
  }
}

/// collectLineCounts - Collect line counts. This must be used after
/// reading .gcno and .gcda files.
void GCOVBlock::collectLineCounts(FileInfo &FI) {
  for (SmallVectorImpl<uint32_t>::iterator I = Lines.begin(),
         E = Lines.end(); I != E; ++I)
    FI.addBlockLine(Parent.getFilename(), *I, this);
}

/// dump - Dump GCOVBlock content to dbgs() for debugging purposes.
void GCOVBlock::dump() const {
  dbgs() << "Block : " << Number << " Counter : " << Counter << "\n";
  if (!SrcEdges.empty()) {
    dbgs() << "\tSource Edges : ";
    for (EdgeIterator I = SrcEdges.begin(), E = SrcEdges.end(); I != E; ++I) {
      const GCOVEdge *Edge = *I;
      dbgs() << Edge->Src->Number << " (" << Edge->Count << "), ";
    }
    dbgs() << "\n";
  }
  if (!DstEdges.empty()) {
    dbgs() << "\tDestination Edges : ";
    for (EdgeIterator I = DstEdges.begin(), E = DstEdges.end(); I != E; ++I) {
      const GCOVEdge *Edge = *I;
      dbgs() << Edge->Dst->Number << " (" << Edge->Count << "), ";
    }
    dbgs() << "\n";
  }
  if (!Lines.empty()) {
    dbgs() << "\tLines : ";
    for (SmallVectorImpl<uint32_t>::const_iterator I = Lines.begin(),
           E = Lines.end(); I != E; ++I)
      dbgs() << (*I) << ",";
    dbgs() << "\n";
  }
}

//===----------------------------------------------------------------------===//
// FileInfo implementation.

// Safe integer division, returns 0 if numerator is 0.
static uint32_t safeDiv(uint64_t Numerator, uint64_t Divisor) {
  if (!Numerator)
    return 0;
  return Numerator/Divisor;
}

// This custom division function mimics gcov's branch ouputs:
//   - Round to closest whole number
//   - Only output 0% or 100% if it's exactly that value
static uint32_t branchDiv(uint64_t Numerator, uint64_t Divisor) {
  if (!Numerator)
    return 0;
  if (Numerator == Divisor)
    return 100;

  uint8_t Res = (Numerator*100+Divisor/2) / Divisor;
  if (Res == 0)
    return 1;
  if (Res == 100)
    return 99;
  return Res;
}

struct formatBranchInfo {
  formatBranchInfo(const GCOVOptions &Options, uint64_t Count,
                   uint64_t Total) :
    Options(Options), Count(Count), Total(Total) {}

  void print(raw_ostream &OS) const {
    if (!Total)
      OS << "never executed";
    else if (Options.BranchCount)
      OS << "taken " << Count;
    else
      OS << "taken " << branchDiv(Count, Total) << "%";
  }

  const GCOVOptions &Options;
  uint64_t Count;
  uint64_t Total;
};

static raw_ostream &operator<<(raw_ostream &OS, const formatBranchInfo &FBI) {
  FBI.print(OS);
  return OS;
}

/// Convert a path to a gcov filename. If PreservePaths is true, this
/// translates "/" to "#", ".." to "^", and drops ".", to match gcov.
static std::string mangleCoveragePath(StringRef Filename, bool PreservePaths) {
  if (!PreservePaths)
    return (sys::path::filename(Filename) + ".gcov").str();

  // This behaviour is defined by gcov in terms of text replacements, so it's
  // not likely to do anything useful on filesystems with different textual
  // conventions.
  llvm::SmallString<256> Result("");
  StringRef::iterator I, S, E;
  for (I = S = Filename.begin(), E = Filename.end(); I != E; ++I) {
    if (*I != '/')
      continue;

    if (I - S == 1 && *S == '.') {
      // ".", the current directory, is skipped.
    } else if (I - S == 2 && *S == '.' && *(S + 1) == '.') {
      // "..", the parent directory, is replaced with "^".
      Result.append("^#");
    } else {
      if (S < I)
        // Leave other components intact,
        Result.append(S, I);
      // And separate with "#".
      Result.push_back('#');
    }
    S = I + 1;
  }

  if (S < I)
    Result.append(S, I);
  Result.append(".gcov");
  return Result.str();
}

/// print -  Print source files with collected line count information.
void FileInfo::print(StringRef GCNOFile, StringRef GCDAFile) {
  for (StringMap<LineData>::const_iterator I = LineInfo.begin(),
         E = LineInfo.end(); I != E; ++I) {
    StringRef Filename = I->first();
    std::unique_ptr<MemoryBuffer> Buff;
    if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
      errs() << Filename << ": " << ec.message() << "\n";
      return;
    }
    StringRef AllLines = Buff->getBuffer();

    std::string CoveragePath = mangleCoveragePath(Filename,
                                                  Options.PreservePaths);
    std::string ErrorInfo;
    raw_fd_ostream OS(CoveragePath.c_str(), ErrorInfo, sys::fs::F_Text);
    if (!ErrorInfo.empty())
      errs() << ErrorInfo << "\n";

    OS << "        -:    0:Source:" << Filename << "\n";
    OS << "        -:    0:Graph:" << GCNOFile << "\n";
    OS << "        -:    0:Data:" << GCDAFile << "\n";
    OS << "        -:    0:Runs:" << RunCount << "\n";
    OS << "        -:    0:Programs:" << ProgramCount << "\n";

    const LineData &Line = I->second;
    GCOVCoverage FileCoverage(Filename);
    for (uint32_t LineIndex = 0; !AllLines.empty(); ++LineIndex) {
      if (Options.BranchInfo) {
        FunctionLines::const_iterator FuncsIt = Line.Functions.find(LineIndex);
        if (FuncsIt != Line.Functions.end())
          printFunctionSummary(OS, FuncsIt->second);
      }

      BlockLines::const_iterator BlocksIt = Line.Blocks.find(LineIndex);
      if (BlocksIt == Line.Blocks.end()) {
        // No basic blocks are on this line. Not an executable line of code.
        OS << "        -:";
        std::pair<StringRef, StringRef> P = AllLines.split('\n');
        OS << format("%5u:", LineIndex+1) << P.first << "\n";
        AllLines = P.second;
      } else {
        const BlockVector &Blocks = BlocksIt->second;

        // Add up the block counts to form line counts.
        DenseMap<const GCOVFunction *, bool> LineExecs;
        uint64_t LineCount = 0;
        for (BlockVector::const_iterator I = Blocks.begin(), E = Blocks.end();
               I != E; ++I) {
          const GCOVBlock *Block = *I;
          if (Options.AllBlocks) {
            // Only take the highest block count for that line.
            uint64_t BlockCount = Block->getCount();
            LineCount = LineCount > BlockCount ? LineCount : BlockCount;
          } else {
            // Sum up all of the block counts.
            LineCount += Block->getCount();
          }

          if (Options.FuncCoverage) {
            // This is a slightly convoluted way to most accurately gather line
            // statistics for functions. Basically what is happening is that we
            // don't want to count a single line with multiple blocks more than
            // once. However, we also don't simply want to give the total line
            // count to every function that starts on the line. Thus, what is
            // happening here are two things:
            // 1) Ensure that the number of logical lines is only incremented
            //    once per function.
            // 2) If there are multiple blocks on the same line, ensure that the
            //    number of lines executed is incremented as long as at least
            //    one of the blocks are executed.
            const GCOVFunction *Function = &Block->getParent();
            if (FuncCoverages.find(Function) == FuncCoverages.end()) {
              std::pair<const GCOVFunction *, GCOVCoverage>
                KeyValue(Function, GCOVCoverage(Function->getName()));
              FuncCoverages.insert(KeyValue);
            }
            GCOVCoverage &FuncCoverage = FuncCoverages.find(Function)->second;

            if (LineExecs.find(Function) == LineExecs.end()) {
              if (Block->getCount()) {
                ++FuncCoverage.LinesExec;
                LineExecs[Function] = true;
              } else {
                LineExecs[Function] = false;
              }
              ++FuncCoverage.LogicalLines;
            } else if (!LineExecs[Function] && Block->getCount()) {
              ++FuncCoverage.LinesExec;
              LineExecs[Function] = true;
            }
          }
        }

        if (LineCount == 0)
          OS << "    #####:";
        else {
          OS << format("%9" PRIu64 ":", LineCount);
          ++FileCoverage.LinesExec;
        }
        ++FileCoverage.LogicalLines;

        std::pair<StringRef, StringRef> P = AllLines.split('\n');
        OS << format("%5u:", LineIndex+1) << P.first << "\n";
        AllLines = P.second;

        uint32_t BlockNo = 0;
        uint32_t EdgeNo = 0;
        for (BlockVector::const_iterator I = Blocks.begin(), E = Blocks.end();
               I != E; ++I) {
          const GCOVBlock *Block = *I;

          // Only print block and branch information at the end of the block.
          if (Block->getLastLine() != LineIndex+1)
            continue;
          if (Options.AllBlocks)
            printBlockInfo(OS, *Block, LineIndex, BlockNo);
          if (Options.BranchInfo) {
            size_t NumEdges = Block->getNumDstEdges();
            if (NumEdges > 1)
              printBranchInfo(OS, *Block, FileCoverage, EdgeNo);
            else if (Options.UncondBranch && NumEdges == 1)
              printUncondBranchInfo(OS, EdgeNo, (*Block->dst_begin())->Count);
          }
        }
      }
    }
    FileCoverages.push_back(std::make_pair(CoveragePath, FileCoverage));
  }

  // FIXME: There is no way to detect calls given current instrumentation.
  if (Options.FuncCoverage)
    printFuncCoverage();
  printFileCoverage();
}

/// printFunctionSummary - Print function and block summary.
void FileInfo::printFunctionSummary(raw_fd_ostream &OS,
                                    const FunctionVector &Funcs) const {
  for (FunctionVector::const_iterator I = Funcs.begin(), E = Funcs.end();
         I != E; ++I) {
    const GCOVFunction *Func = *I;
    uint64_t EntryCount = Func->getEntryCount();
    uint32_t BlocksExec = 0;
    for (GCOVFunction::BlockIterator I = Func->block_begin(),
           E = Func->block_end(); I != E; ++I) {
      const GCOVBlock *Block = *I;
      if (Block->getNumDstEdges() && Block->getCount())
          ++BlocksExec;
    }

    OS << "function " << Func->getName() << " called " << EntryCount
       << " returned " << safeDiv(Func->getExitCount()*100, EntryCount)
       << "% blocks executed "
       << safeDiv(BlocksExec*100, Func->getNumBlocks()-1) << "%\n";
  }
}

/// printBlockInfo - Output counts for each block.
void FileInfo::printBlockInfo(raw_fd_ostream &OS, const GCOVBlock &Block,
                              uint32_t LineIndex, uint32_t &BlockNo) const {
  if (Block.getCount() == 0)
    OS << "    $$$$$:";
  else
    OS << format("%9" PRIu64 ":", Block.getCount());
  OS << format("%5u-block %2u\n", LineIndex+1, BlockNo++);
}

/// printBranchInfo - Print conditional branch probabilities.
void FileInfo::printBranchInfo(raw_fd_ostream &OS, const GCOVBlock &Block,
                               GCOVCoverage &Coverage, uint32_t &EdgeNo) {
  SmallVector<uint64_t, 16> BranchCounts;
  uint64_t TotalCounts = 0;
  for (GCOVBlock::EdgeIterator I = Block.dst_begin(), E = Block.dst_end();
         I != E; ++I) {
    const GCOVEdge *Edge = *I;
    BranchCounts.push_back(Edge->Count);
    TotalCounts += Edge->Count;
    if (Block.getCount()) ++Coverage.BranchesExec;
    if (Edge->Count) ++Coverage.BranchesTaken;
    ++Coverage.Branches;

    if (Options.FuncCoverage) {
      const GCOVFunction *Function = &Block.getParent();
      GCOVCoverage &FuncCoverage = FuncCoverages.find(Function)->second;
      if (Block.getCount()) ++FuncCoverage.BranchesExec;
      if (Edge->Count) ++FuncCoverage.BranchesTaken;
      ++FuncCoverage.Branches;
    }
  }

  for (SmallVectorImpl<uint64_t>::const_iterator I = BranchCounts.begin(),
         E = BranchCounts.end(); I != E; ++I) {
    OS << format("branch %2u ", EdgeNo++)
       << formatBranchInfo(Options, *I, TotalCounts) << "\n";
  }
}

/// printUncondBranchInfo - Print unconditional branch probabilities.
void FileInfo::printUncondBranchInfo(raw_fd_ostream &OS, uint32_t &EdgeNo,
                                     uint64_t Count) const {
  OS << format("unconditional %2u ", EdgeNo++)
     << formatBranchInfo(Options, Count, Count) << "\n";
}

// printCoverage - Print generic coverage info used by both printFuncCoverage
// and printFileCoverage.
void FileInfo::printCoverage(const GCOVCoverage &Coverage) const {
  outs() << format("Lines executed:%.2f%% of %u\n",
                   double(Coverage.LinesExec)*100/Coverage.LogicalLines,
                   Coverage.LogicalLines);
  if (Options.BranchInfo) {
    if (Coverage.Branches) {
      outs() << format("Branches executed:%.2f%% of %u\n",
                       double(Coverage.BranchesExec)*100/Coverage.Branches,
                       Coverage.Branches);
      outs() << format("Taken at least once:%.2f%% of %u\n",
                       double(Coverage.BranchesTaken)*100/Coverage.Branches,
                       Coverage.Branches);
    } else {
      outs() << "No branches\n";
    }
    outs() << "No calls\n"; // to be consistent with gcov
  }
}

// printFuncCoverage - Print per-function coverage info.
void FileInfo::printFuncCoverage() const {
  for (FuncCoverageMap::const_iterator I = FuncCoverages.begin(),
                                       E = FuncCoverages.end(); I != E; ++I) {
    const GCOVCoverage &Coverage = I->second;
    outs() << "Function '" << Coverage.Name << "'\n";
    printCoverage(Coverage);
    outs() << "\n";
  }
}

// printFileCoverage - Print per-file coverage info.
void FileInfo::printFileCoverage() const {
  for (FileCoverageList::const_iterator I = FileCoverages.begin(),
                                        E = FileCoverages.end(); I != E; ++I) {
    const std::string &Filename = I->first;
    const GCOVCoverage &Coverage = I->second;
    outs() << "File '" << Coverage.Name << "'\n";
    printCoverage(Coverage);
    outs() << Coverage.Name << ":creating '" << Filename << "'\n\n";
  }
}