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      1 //===- GCOV.cpp - LLVM coverage tool --------------------------------------===//
      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 // GCOV implements the interface to read and write coverage files that use
     11 // 'gcov' format.
     12 //
     13 //===----------------------------------------------------------------------===//
     14 
     15 #include "llvm/Support/GCOV.h"
     16 #include "llvm/ADT/STLExtras.h"
     17 #include "llvm/Support/Debug.h"
     18 #include "llvm/Support/FileSystem.h"
     19 #include "llvm/Support/Format.h"
     20 #include "llvm/Support/MemoryObject.h"
     21 #include "llvm/Support/Path.h"
     22 #include "llvm/Support/raw_ostream.h"
     23 #include <algorithm>
     24 #include <system_error>
     25 using namespace llvm;
     26 
     27 //===----------------------------------------------------------------------===//
     28 // GCOVFile implementation.
     29 
     30 /// readGCNO - Read GCNO buffer.
     31 bool GCOVFile::readGCNO(GCOVBuffer &Buffer) {
     32   if (!Buffer.readGCNOFormat())
     33     return false;
     34   if (!Buffer.readGCOVVersion(Version))
     35     return false;
     36 
     37   if (!Buffer.readInt(Checksum))
     38     return false;
     39   while (true) {
     40     if (!Buffer.readFunctionTag())
     41       break;
     42     auto GFun = make_unique<GCOVFunction>(*this);
     43     if (!GFun->readGCNO(Buffer, Version))
     44       return false;
     45     Functions.push_back(std::move(GFun));
     46   }
     47 
     48   GCNOInitialized = true;
     49   return true;
     50 }
     51 
     52 /// readGCDA - Read GCDA buffer. It is required that readGCDA() can only be
     53 /// called after readGCNO().
     54 bool GCOVFile::readGCDA(GCOVBuffer &Buffer) {
     55   assert(GCNOInitialized && "readGCDA() can only be called after readGCNO()");
     56   if (!Buffer.readGCDAFormat())
     57     return false;
     58   GCOV::GCOVVersion GCDAVersion;
     59   if (!Buffer.readGCOVVersion(GCDAVersion))
     60     return false;
     61   if (Version != GCDAVersion) {
     62     errs() << "GCOV versions do not match.\n";
     63     return false;
     64   }
     65 
     66   uint32_t GCDAChecksum;
     67   if (!Buffer.readInt(GCDAChecksum))
     68     return false;
     69   if (Checksum != GCDAChecksum) {
     70     errs() << "File checksums do not match: " << Checksum
     71            << " != " << GCDAChecksum << ".\n";
     72     return false;
     73   }
     74   for (size_t i = 0, e = Functions.size(); i < e; ++i) {
     75     if (!Buffer.readFunctionTag()) {
     76       errs() << "Unexpected number of functions.\n";
     77       return false;
     78     }
     79     if (!Functions[i]->readGCDA(Buffer, Version))
     80       return false;
     81   }
     82   if (Buffer.readObjectTag()) {
     83     uint32_t Length;
     84     uint32_t Dummy;
     85     if (!Buffer.readInt(Length))
     86       return false;
     87     if (!Buffer.readInt(Dummy))
     88       return false; // checksum
     89     if (!Buffer.readInt(Dummy))
     90       return false; // num
     91     if (!Buffer.readInt(RunCount))
     92       return false;
     93     Buffer.advanceCursor(Length - 3);
     94   }
     95   while (Buffer.readProgramTag()) {
     96     uint32_t Length;
     97     if (!Buffer.readInt(Length))
     98       return false;
     99     Buffer.advanceCursor(Length);
    100     ++ProgramCount;
    101   }
    102 
    103   return true;
    104 }
    105 
    106 /// dump - Dump GCOVFile content to dbgs() for debugging purposes.
    107 void GCOVFile::dump() const {
    108   for (const auto &FPtr : Functions)
    109     FPtr->dump();
    110 }
    111 
    112 /// collectLineCounts - Collect line counts. This must be used after
    113 /// reading .gcno and .gcda files.
    114 void GCOVFile::collectLineCounts(FileInfo &FI) {
    115   for (const auto &FPtr : Functions)
    116     FPtr->collectLineCounts(FI);
    117   FI.setRunCount(RunCount);
    118   FI.setProgramCount(ProgramCount);
    119 }
    120 
    121 //===----------------------------------------------------------------------===//
    122 // GCOVFunction implementation.
    123 
    124 /// readGCNO - Read a function from the GCNO buffer. Return false if an error
    125 /// occurs.
    126 bool GCOVFunction::readGCNO(GCOVBuffer &Buff, GCOV::GCOVVersion Version) {
    127   uint32_t Dummy;
    128   if (!Buff.readInt(Dummy))
    129     return false; // Function header length
    130   if (!Buff.readInt(Ident))
    131     return false;
    132   if (!Buff.readInt(Checksum))
    133     return false;
    134   if (Version != GCOV::V402) {
    135     uint32_t CfgChecksum;
    136     if (!Buff.readInt(CfgChecksum))
    137       return false;
    138     if (Parent.getChecksum() != CfgChecksum) {
    139       errs() << "File checksums do not match: " << Parent.getChecksum()
    140              << " != " << CfgChecksum << " in (" << Name << ").\n";
    141       return false;
    142     }
    143   }
    144   if (!Buff.readString(Name))
    145     return false;
    146   if (!Buff.readString(Filename))
    147     return false;
    148   if (!Buff.readInt(LineNumber))
    149     return false;
    150 
    151   // read blocks.
    152   if (!Buff.readBlockTag()) {
    153     errs() << "Block tag not found.\n";
    154     return false;
    155   }
    156   uint32_t BlockCount;
    157   if (!Buff.readInt(BlockCount))
    158     return false;
    159   for (uint32_t i = 0, e = BlockCount; i != e; ++i) {
    160     if (!Buff.readInt(Dummy))
    161       return false; // Block flags;
    162     Blocks.push_back(make_unique<GCOVBlock>(*this, i));
    163   }
    164 
    165   // read edges.
    166   while (Buff.readEdgeTag()) {
    167     uint32_t EdgeCount;
    168     if (!Buff.readInt(EdgeCount))
    169       return false;
    170     EdgeCount = (EdgeCount - 1) / 2;
    171     uint32_t BlockNo;
    172     if (!Buff.readInt(BlockNo))
    173       return false;
    174     if (BlockNo >= BlockCount) {
    175       errs() << "Unexpected block number: " << BlockNo << " (in " << Name
    176              << ").\n";
    177       return false;
    178     }
    179     for (uint32_t i = 0, e = EdgeCount; i != e; ++i) {
    180       uint32_t Dst;
    181       if (!Buff.readInt(Dst))
    182         return false;
    183       Edges.push_back(make_unique<GCOVEdge>(*Blocks[BlockNo], *Blocks[Dst]));
    184       GCOVEdge *Edge = Edges.back().get();
    185       Blocks[BlockNo]->addDstEdge(Edge);
    186       Blocks[Dst]->addSrcEdge(Edge);
    187       if (!Buff.readInt(Dummy))
    188         return false; // Edge flag
    189     }
    190   }
    191 
    192   // read line table.
    193   while (Buff.readLineTag()) {
    194     uint32_t LineTableLength;
    195     // Read the length of this line table.
    196     if (!Buff.readInt(LineTableLength))
    197       return false;
    198     uint32_t EndPos = Buff.getCursor() + LineTableLength * 4;
    199     uint32_t BlockNo;
    200     // Read the block number this table is associated with.
    201     if (!Buff.readInt(BlockNo))
    202       return false;
    203     if (BlockNo >= BlockCount) {
    204       errs() << "Unexpected block number: " << BlockNo << " (in " << Name
    205              << ").\n";
    206       return false;
    207     }
    208     GCOVBlock &Block = *Blocks[BlockNo];
    209     // Read the word that pads the beginning of the line table. This may be a
    210     // flag of some sort, but seems to always be zero.
    211     if (!Buff.readInt(Dummy))
    212       return false;
    213 
    214     // Line information starts here and continues up until the last word.
    215     if (Buff.getCursor() != (EndPos - sizeof(uint32_t))) {
    216       StringRef F;
    217       // Read the source file name.
    218       if (!Buff.readString(F))
    219         return false;
    220       if (Filename != F) {
    221         errs() << "Multiple sources for a single basic block: " << Filename
    222                << " != " << F << " (in " << Name << ").\n";
    223         return false;
    224       }
    225       // Read lines up to, but not including, the null terminator.
    226       while (Buff.getCursor() < (EndPos - 2 * sizeof(uint32_t))) {
    227         uint32_t Line;
    228         if (!Buff.readInt(Line))
    229           return false;
    230         // Line 0 means this instruction was injected by the compiler. Skip it.
    231         if (!Line)
    232           continue;
    233         Block.addLine(Line);
    234       }
    235       // Read the null terminator.
    236       if (!Buff.readInt(Dummy))
    237         return false;
    238     }
    239     // The last word is either a flag or padding, it isn't clear which. Skip
    240     // over it.
    241     if (!Buff.readInt(Dummy))
    242       return false;
    243   }
    244   return true;
    245 }
    246 
    247 /// readGCDA - Read a function from the GCDA buffer. Return false if an error
    248 /// occurs.
    249 bool GCOVFunction::readGCDA(GCOVBuffer &Buff, GCOV::GCOVVersion Version) {
    250   uint32_t Dummy;
    251   if (!Buff.readInt(Dummy))
    252     return false; // Function header length
    253 
    254   uint32_t GCDAIdent;
    255   if (!Buff.readInt(GCDAIdent))
    256     return false;
    257   if (Ident != GCDAIdent) {
    258     errs() << "Function identifiers do not match: " << Ident
    259            << " != " << GCDAIdent << " (in " << Name << ").\n";
    260     return false;
    261   }
    262 
    263   uint32_t GCDAChecksum;
    264   if (!Buff.readInt(GCDAChecksum))
    265     return false;
    266   if (Checksum != GCDAChecksum) {
    267     errs() << "Function checksums do not match: " << Checksum
    268            << " != " << GCDAChecksum << " (in " << Name << ").\n";
    269     return false;
    270   }
    271 
    272   uint32_t CfgChecksum;
    273   if (Version != GCOV::V402) {
    274     if (!Buff.readInt(CfgChecksum))
    275       return false;
    276     if (Parent.getChecksum() != CfgChecksum) {
    277       errs() << "File checksums do not match: " << Parent.getChecksum()
    278              << " != " << CfgChecksum << " (in " << Name << ").\n";
    279       return false;
    280     }
    281   }
    282 
    283   StringRef GCDAName;
    284   if (!Buff.readString(GCDAName))
    285     return false;
    286   if (Name != GCDAName) {
    287     errs() << "Function names do not match: " << Name << " != " << GCDAName
    288            << ".\n";
    289     return false;
    290   }
    291 
    292   if (!Buff.readArcTag()) {
    293     errs() << "Arc tag not found (in " << Name << ").\n";
    294     return false;
    295   }
    296 
    297   uint32_t Count;
    298   if (!Buff.readInt(Count))
    299     return false;
    300   Count /= 2;
    301 
    302   // This for loop adds the counts for each block. A second nested loop is
    303   // required to combine the edge counts that are contained in the GCDA file.
    304   for (uint32_t BlockNo = 0; Count > 0; ++BlockNo) {
    305     // The last block is always reserved for exit block
    306     if (BlockNo >= Blocks.size()) {
    307       errs() << "Unexpected number of edges (in " << Name << ").\n";
    308       return false;
    309     }
    310     if (BlockNo == Blocks.size() - 1)
    311       errs() << "(" << Name << ") has arcs from exit block.\n";
    312     GCOVBlock &Block = *Blocks[BlockNo];
    313     for (size_t EdgeNo = 0, End = Block.getNumDstEdges(); EdgeNo < End;
    314          ++EdgeNo) {
    315       if (Count == 0) {
    316         errs() << "Unexpected number of edges (in " << Name << ").\n";
    317         return false;
    318       }
    319       uint64_t ArcCount;
    320       if (!Buff.readInt64(ArcCount))
    321         return false;
    322       Block.addCount(EdgeNo, ArcCount);
    323       --Count;
    324     }
    325     Block.sortDstEdges();
    326   }
    327   return true;
    328 }
    329 
    330 /// getEntryCount - Get the number of times the function was called by
    331 /// retrieving the entry block's count.
    332 uint64_t GCOVFunction::getEntryCount() const {
    333   return Blocks.front()->getCount();
    334 }
    335 
    336 /// getExitCount - Get the number of times the function returned by retrieving
    337 /// the exit block's count.
    338 uint64_t GCOVFunction::getExitCount() const {
    339   return Blocks.back()->getCount();
    340 }
    341 
    342 /// dump - Dump GCOVFunction content to dbgs() for debugging purposes.
    343 void GCOVFunction::dump() const {
    344   dbgs() << "===== " << Name << " (" << Ident << ") @ " << Filename << ":"
    345          << LineNumber << "\n";
    346   for (const auto &Block : Blocks)
    347     Block->dump();
    348 }
    349 
    350 /// collectLineCounts - Collect line counts. This must be used after
    351 /// reading .gcno and .gcda files.
    352 void GCOVFunction::collectLineCounts(FileInfo &FI) {
    353   // If the line number is zero, this is a function that doesn't actually appear
    354   // in the source file, so there isn't anything we can do with it.
    355   if (LineNumber == 0)
    356     return;
    357 
    358   for (const auto &Block : Blocks)
    359     Block->collectLineCounts(FI);
    360   FI.addFunctionLine(Filename, LineNumber, this);
    361 }
    362 
    363 //===----------------------------------------------------------------------===//
    364 // GCOVBlock implementation.
    365 
    366 /// ~GCOVBlock - Delete GCOVBlock and its content.
    367 GCOVBlock::~GCOVBlock() {
    368   SrcEdges.clear();
    369   DstEdges.clear();
    370   Lines.clear();
    371 }
    372 
    373 /// addCount - Add to block counter while storing the edge count. If the
    374 /// destination has no outgoing edges, also update that block's count too.
    375 void GCOVBlock::addCount(size_t DstEdgeNo, uint64_t N) {
    376   assert(DstEdgeNo < DstEdges.size()); // up to caller to ensure EdgeNo is valid
    377   DstEdges[DstEdgeNo]->Count = N;
    378   Counter += N;
    379   if (!DstEdges[DstEdgeNo]->Dst.getNumDstEdges())
    380     DstEdges[DstEdgeNo]->Dst.Counter += N;
    381 }
    382 
    383 /// sortDstEdges - Sort destination edges by block number, nop if already
    384 /// sorted. This is required for printing branch info in the correct order.
    385 void GCOVBlock::sortDstEdges() {
    386   if (!DstEdgesAreSorted) {
    387     SortDstEdgesFunctor SortEdges;
    388     std::stable_sort(DstEdges.begin(), DstEdges.end(), SortEdges);
    389   }
    390 }
    391 
    392 /// collectLineCounts - Collect line counts. This must be used after
    393 /// reading .gcno and .gcda files.
    394 void GCOVBlock::collectLineCounts(FileInfo &FI) {
    395   for (uint32_t N : Lines)
    396     FI.addBlockLine(Parent.getFilename(), N, this);
    397 }
    398 
    399 /// dump - Dump GCOVBlock content to dbgs() for debugging purposes.
    400 void GCOVBlock::dump() const {
    401   dbgs() << "Block : " << Number << " Counter : " << Counter << "\n";
    402   if (!SrcEdges.empty()) {
    403     dbgs() << "\tSource Edges : ";
    404     for (const GCOVEdge *Edge : SrcEdges)
    405       dbgs() << Edge->Src.Number << " (" << Edge->Count << "), ";
    406     dbgs() << "\n";
    407   }
    408   if (!DstEdges.empty()) {
    409     dbgs() << "\tDestination Edges : ";
    410     for (const GCOVEdge *Edge : DstEdges)
    411       dbgs() << Edge->Dst.Number << " (" << Edge->Count << "), ";
    412     dbgs() << "\n";
    413   }
    414   if (!Lines.empty()) {
    415     dbgs() << "\tLines : ";
    416     for (uint32_t N : Lines)
    417       dbgs() << (N) << ",";
    418     dbgs() << "\n";
    419   }
    420 }
    421 
    422 //===----------------------------------------------------------------------===//
    423 // FileInfo implementation.
    424 
    425 // Safe integer division, returns 0 if numerator is 0.
    426 static uint32_t safeDiv(uint64_t Numerator, uint64_t Divisor) {
    427   if (!Numerator)
    428     return 0;
    429   return Numerator / Divisor;
    430 }
    431 
    432 // This custom division function mimics gcov's branch ouputs:
    433 //   - Round to closest whole number
    434 //   - Only output 0% or 100% if it's exactly that value
    435 static uint32_t branchDiv(uint64_t Numerator, uint64_t Divisor) {
    436   if (!Numerator)
    437     return 0;
    438   if (Numerator == Divisor)
    439     return 100;
    440 
    441   uint8_t Res = (Numerator * 100 + Divisor / 2) / Divisor;
    442   if (Res == 0)
    443     return 1;
    444   if (Res == 100)
    445     return 99;
    446   return Res;
    447 }
    448 
    449 namespace {
    450 struct formatBranchInfo {
    451   formatBranchInfo(const GCOV::Options &Options, uint64_t Count, uint64_t Total)
    452       : Options(Options), Count(Count), Total(Total) {}
    453 
    454   void print(raw_ostream &OS) const {
    455     if (!Total)
    456       OS << "never executed";
    457     else if (Options.BranchCount)
    458       OS << "taken " << Count;
    459     else
    460       OS << "taken " << branchDiv(Count, Total) << "%";
    461   }
    462 
    463   const GCOV::Options &Options;
    464   uint64_t Count;
    465   uint64_t Total;
    466 };
    467 
    468 static raw_ostream &operator<<(raw_ostream &OS, const formatBranchInfo &FBI) {
    469   FBI.print(OS);
    470   return OS;
    471 }
    472 
    473 class LineConsumer {
    474   std::unique_ptr<MemoryBuffer> Buffer;
    475   StringRef Remaining;
    476 
    477 public:
    478   LineConsumer(StringRef Filename) {
    479     ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
    480         MemoryBuffer::getFileOrSTDIN(Filename);
    481     if (std::error_code EC = BufferOrErr.getError()) {
    482       errs() << Filename << ": " << EC.message() << "\n";
    483       Remaining = "";
    484     } else {
    485       Buffer = std::move(BufferOrErr.get());
    486       Remaining = Buffer->getBuffer();
    487     }
    488   }
    489   bool empty() { return Remaining.empty(); }
    490   void printNext(raw_ostream &OS, uint32_t LineNum) {
    491     StringRef Line;
    492     if (empty())
    493       Line = "/*EOF*/";
    494     else
    495       std::tie(Line, Remaining) = Remaining.split("\n");
    496     OS << format("%5u:", LineNum) << Line << "\n";
    497   }
    498 };
    499 }
    500 
    501 /// Convert a path to a gcov filename. If PreservePaths is true, this
    502 /// translates "/" to "#", ".." to "^", and drops ".", to match gcov.
    503 static std::string mangleCoveragePath(StringRef Filename, bool PreservePaths) {
    504   if (!PreservePaths)
    505     return sys::path::filename(Filename).str();
    506 
    507   // This behaviour is defined by gcov in terms of text replacements, so it's
    508   // not likely to do anything useful on filesystems with different textual
    509   // conventions.
    510   llvm::SmallString<256> Result("");
    511   StringRef::iterator I, S, E;
    512   for (I = S = Filename.begin(), E = Filename.end(); I != E; ++I) {
    513     if (*I != '/')
    514       continue;
    515 
    516     if (I - S == 1 && *S == '.') {
    517       // ".", the current directory, is skipped.
    518     } else if (I - S == 2 && *S == '.' && *(S + 1) == '.') {
    519       // "..", the parent directory, is replaced with "^".
    520       Result.append("^#");
    521     } else {
    522       if (S < I)
    523         // Leave other components intact,
    524         Result.append(S, I);
    525       // And separate with "#".
    526       Result.push_back('#');
    527     }
    528     S = I + 1;
    529   }
    530 
    531   if (S < I)
    532     Result.append(S, I);
    533   return Result.str();
    534 }
    535 
    536 std::string FileInfo::getCoveragePath(StringRef Filename,
    537                                       StringRef MainFilename) {
    538   if (Options.NoOutput)
    539     // This is probably a bug in gcov, but when -n is specified, paths aren't
    540     // mangled at all, and the -l and -p options are ignored. Here, we do the
    541     // same.
    542     return Filename;
    543 
    544   std::string CoveragePath;
    545   if (Options.LongFileNames && !Filename.equals(MainFilename))
    546     CoveragePath =
    547         mangleCoveragePath(MainFilename, Options.PreservePaths) + "##";
    548   CoveragePath += mangleCoveragePath(Filename, Options.PreservePaths) + ".gcov";
    549   return CoveragePath;
    550 }
    551 
    552 std::unique_ptr<raw_ostream>
    553 FileInfo::openCoveragePath(StringRef CoveragePath) {
    554   if (Options.NoOutput)
    555     return llvm::make_unique<raw_null_ostream>();
    556 
    557   std::error_code EC;
    558   auto OS = llvm::make_unique<raw_fd_ostream>(CoveragePath, EC,
    559                                               sys::fs::F_Text);
    560   if (EC) {
    561     errs() << EC.message() << "\n";
    562     return llvm::make_unique<raw_null_ostream>();
    563   }
    564   return std::move(OS);
    565 }
    566 
    567 /// print -  Print source files with collected line count information.
    568 void FileInfo::print(raw_ostream &InfoOS, StringRef MainFilename,
    569                      StringRef GCNOFile, StringRef GCDAFile) {
    570   for (const auto &LI : LineInfo) {
    571     StringRef Filename = LI.first();
    572     auto AllLines = LineConsumer(Filename);
    573 
    574     std::string CoveragePath = getCoveragePath(Filename, MainFilename);
    575     std::unique_ptr<raw_ostream> CovStream = openCoveragePath(CoveragePath);
    576     raw_ostream &CovOS = *CovStream;
    577 
    578     CovOS << "        -:    0:Source:" << Filename << "\n";
    579     CovOS << "        -:    0:Graph:" << GCNOFile << "\n";
    580     CovOS << "        -:    0:Data:" << GCDAFile << "\n";
    581     CovOS << "        -:    0:Runs:" << RunCount << "\n";
    582     CovOS << "        -:    0:Programs:" << ProgramCount << "\n";
    583 
    584     const LineData &Line = LI.second;
    585     GCOVCoverage FileCoverage(Filename);
    586     for (uint32_t LineIndex = 0; LineIndex < Line.LastLine || !AllLines.empty();
    587          ++LineIndex) {
    588       if (Options.BranchInfo) {
    589         FunctionLines::const_iterator FuncsIt = Line.Functions.find(LineIndex);
    590         if (FuncsIt != Line.Functions.end())
    591           printFunctionSummary(CovOS, FuncsIt->second);
    592       }
    593 
    594       BlockLines::const_iterator BlocksIt = Line.Blocks.find(LineIndex);
    595       if (BlocksIt == Line.Blocks.end()) {
    596         // No basic blocks are on this line. Not an executable line of code.
    597         CovOS << "        -:";
    598         AllLines.printNext(CovOS, LineIndex + 1);
    599       } else {
    600         const BlockVector &Blocks = BlocksIt->second;
    601 
    602         // Add up the block counts to form line counts.
    603         DenseMap<const GCOVFunction *, bool> LineExecs;
    604         uint64_t LineCount = 0;
    605         for (const GCOVBlock *Block : Blocks) {
    606           if (Options.AllBlocks) {
    607             // Only take the highest block count for that line.
    608             uint64_t BlockCount = Block->getCount();
    609             LineCount = LineCount > BlockCount ? LineCount : BlockCount;
    610           } else {
    611             // Sum up all of the block counts.
    612             LineCount += Block->getCount();
    613           }
    614 
    615           if (Options.FuncCoverage) {
    616             // This is a slightly convoluted way to most accurately gather line
    617             // statistics for functions. Basically what is happening is that we
    618             // don't want to count a single line with multiple blocks more than
    619             // once. However, we also don't simply want to give the total line
    620             // count to every function that starts on the line. Thus, what is
    621             // happening here are two things:
    622             // 1) Ensure that the number of logical lines is only incremented
    623             //    once per function.
    624             // 2) If there are multiple blocks on the same line, ensure that the
    625             //    number of lines executed is incremented as long as at least
    626             //    one of the blocks are executed.
    627             const GCOVFunction *Function = &Block->getParent();
    628             if (FuncCoverages.find(Function) == FuncCoverages.end()) {
    629               std::pair<const GCOVFunction *, GCOVCoverage> KeyValue(
    630                   Function, GCOVCoverage(Function->getName()));
    631               FuncCoverages.insert(KeyValue);
    632             }
    633             GCOVCoverage &FuncCoverage = FuncCoverages.find(Function)->second;
    634 
    635             if (LineExecs.find(Function) == LineExecs.end()) {
    636               if (Block->getCount()) {
    637                 ++FuncCoverage.LinesExec;
    638                 LineExecs[Function] = true;
    639               } else {
    640                 LineExecs[Function] = false;
    641               }
    642               ++FuncCoverage.LogicalLines;
    643             } else if (!LineExecs[Function] && Block->getCount()) {
    644               ++FuncCoverage.LinesExec;
    645               LineExecs[Function] = true;
    646             }
    647           }
    648         }
    649 
    650         if (LineCount == 0)
    651           CovOS << "    #####:";
    652         else {
    653           CovOS << format("%9" PRIu64 ":", LineCount);
    654           ++FileCoverage.LinesExec;
    655         }
    656         ++FileCoverage.LogicalLines;
    657 
    658         AllLines.printNext(CovOS, LineIndex + 1);
    659 
    660         uint32_t BlockNo = 0;
    661         uint32_t EdgeNo = 0;
    662         for (const GCOVBlock *Block : Blocks) {
    663           // Only print block and branch information at the end of the block.
    664           if (Block->getLastLine() != LineIndex + 1)
    665             continue;
    666           if (Options.AllBlocks)
    667             printBlockInfo(CovOS, *Block, LineIndex, BlockNo);
    668           if (Options.BranchInfo) {
    669             size_t NumEdges = Block->getNumDstEdges();
    670             if (NumEdges > 1)
    671               printBranchInfo(CovOS, *Block, FileCoverage, EdgeNo);
    672             else if (Options.UncondBranch && NumEdges == 1)
    673               printUncondBranchInfo(CovOS, EdgeNo,
    674                                     (*Block->dst_begin())->Count);
    675           }
    676         }
    677       }
    678     }
    679     FileCoverages.push_back(std::make_pair(CoveragePath, FileCoverage));
    680   }
    681 
    682   // FIXME: There is no way to detect calls given current instrumentation.
    683   if (Options.FuncCoverage)
    684     printFuncCoverage(InfoOS);
    685   printFileCoverage(InfoOS);
    686   return;
    687 }
    688 
    689 /// printFunctionSummary - Print function and block summary.
    690 void FileInfo::printFunctionSummary(raw_ostream &OS,
    691                                     const FunctionVector &Funcs) const {
    692   for (const GCOVFunction *Func : Funcs) {
    693     uint64_t EntryCount = Func->getEntryCount();
    694     uint32_t BlocksExec = 0;
    695     for (const GCOVBlock &Block : Func->blocks())
    696       if (Block.getNumDstEdges() && Block.getCount())
    697         ++BlocksExec;
    698 
    699     OS << "function " << Func->getName() << " called " << EntryCount
    700        << " returned " << safeDiv(Func->getExitCount() * 100, EntryCount)
    701        << "% blocks executed "
    702        << safeDiv(BlocksExec * 100, Func->getNumBlocks() - 1) << "%\n";
    703   }
    704 }
    705 
    706 /// printBlockInfo - Output counts for each block.
    707 void FileInfo::printBlockInfo(raw_ostream &OS, const GCOVBlock &Block,
    708                               uint32_t LineIndex, uint32_t &BlockNo) const {
    709   if (Block.getCount() == 0)
    710     OS << "    $$$$$:";
    711   else
    712     OS << format("%9" PRIu64 ":", Block.getCount());
    713   OS << format("%5u-block %2u\n", LineIndex + 1, BlockNo++);
    714 }
    715 
    716 /// printBranchInfo - Print conditional branch probabilities.
    717 void FileInfo::printBranchInfo(raw_ostream &OS, const GCOVBlock &Block,
    718                                GCOVCoverage &Coverage, uint32_t &EdgeNo) {
    719   SmallVector<uint64_t, 16> BranchCounts;
    720   uint64_t TotalCounts = 0;
    721   for (const GCOVEdge *Edge : Block.dsts()) {
    722     BranchCounts.push_back(Edge->Count);
    723     TotalCounts += Edge->Count;
    724     if (Block.getCount())
    725       ++Coverage.BranchesExec;
    726     if (Edge->Count)
    727       ++Coverage.BranchesTaken;
    728     ++Coverage.Branches;
    729 
    730     if (Options.FuncCoverage) {
    731       const GCOVFunction *Function = &Block.getParent();
    732       GCOVCoverage &FuncCoverage = FuncCoverages.find(Function)->second;
    733       if (Block.getCount())
    734         ++FuncCoverage.BranchesExec;
    735       if (Edge->Count)
    736         ++FuncCoverage.BranchesTaken;
    737       ++FuncCoverage.Branches;
    738     }
    739   }
    740 
    741   for (uint64_t N : BranchCounts)
    742     OS << format("branch %2u ", EdgeNo++)
    743        << formatBranchInfo(Options, N, TotalCounts) << "\n";
    744 }
    745 
    746 /// printUncondBranchInfo - Print unconditional branch probabilities.
    747 void FileInfo::printUncondBranchInfo(raw_ostream &OS, uint32_t &EdgeNo,
    748                                      uint64_t Count) const {
    749   OS << format("unconditional %2u ", EdgeNo++)
    750      << formatBranchInfo(Options, Count, Count) << "\n";
    751 }
    752 
    753 // printCoverage - Print generic coverage info used by both printFuncCoverage
    754 // and printFileCoverage.
    755 void FileInfo::printCoverage(raw_ostream &OS,
    756                              const GCOVCoverage &Coverage) const {
    757   OS << format("Lines executed:%.2f%% of %u\n",
    758                double(Coverage.LinesExec) * 100 / Coverage.LogicalLines,
    759                Coverage.LogicalLines);
    760   if (Options.BranchInfo) {
    761     if (Coverage.Branches) {
    762       OS << format("Branches executed:%.2f%% of %u\n",
    763                    double(Coverage.BranchesExec) * 100 / Coverage.Branches,
    764                    Coverage.Branches);
    765       OS << format("Taken at least once:%.2f%% of %u\n",
    766                    double(Coverage.BranchesTaken) * 100 / Coverage.Branches,
    767                    Coverage.Branches);
    768     } else {
    769       OS << "No branches\n";
    770     }
    771     OS << "No calls\n"; // to be consistent with gcov
    772   }
    773 }
    774 
    775 // printFuncCoverage - Print per-function coverage info.
    776 void FileInfo::printFuncCoverage(raw_ostream &OS) const {
    777   for (const auto &FC : FuncCoverages) {
    778     const GCOVCoverage &Coverage = FC.second;
    779     OS << "Function '" << Coverage.Name << "'\n";
    780     printCoverage(OS, Coverage);
    781     OS << "\n";
    782   }
    783 }
    784 
    785 // printFileCoverage - Print per-file coverage info.
    786 void FileInfo::printFileCoverage(raw_ostream &OS) const {
    787   for (const auto &FC : FileCoverages) {
    788     const std::string &Filename = FC.first;
    789     const GCOVCoverage &Coverage = FC.second;
    790     OS << "File '" << Coverage.Name << "'\n";
    791     printCoverage(OS, Coverage);
    792     if (!Options.NoOutput)
    793       OS << Coverage.Name << ":creating '" << Filename << "'\n";
    794     OS << "\n";
    795   }
    796 }
    797