tools/llvm-cov/CoverageExporterLcov.cpp

   1 //===- CoverageExporterLcov.cpp - Code coverage export --------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements export of code coverage data to lcov trace file format.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 //===----------------------------------------------------------------------===//
  14 //
  15 // The trace file code coverage export follows the following format (see also
  16 // https://linux.die.net/man/1/geninfo). Each quoted string appears on its own
  17 // line; the indentation shown here is only for documentation purposes.
  18 //
  19 // - for each source file:
  20 //   - "SF:<absolute path to source file>"
  21 //   - for each function:
  22 //     - "FN:<line number of function start>,<function name>"
  23 //   - for each function:
  24 //     - "FNDA:<execution count>,<function name>"
  25 //   - "FNF:<number of functions found>"
  26 //   - "FNH:<number of functions hit>"
  27 //   - for each instrumented line:
  28 //     - "DA:<line number>,<execution count>[,<checksum>]
  29 //   - "LH:<number of lines with non-zero execution count>"
  30 //   - "LF:<nubmer of instrumented lines>"
  31 //   - "end_of_record"
  32 //
  33 // If the user is exporting summary information only, then the FN, FNDA, and DA
  34 // lines will not be present.
  35 //
  36 //===----------------------------------------------------------------------===//
  37
  38 #include "CoverageExporterLcov.h"
  39 #include "CoverageReport.h"
  40
  41 using namespace llvm;
  42
  43 namespace {
  44
  45 void renderFunctionSummary(raw_ostream &OS,
  46                            const FileCoverageSummary &Summary) {
  47   OS << "FNF:" << Summary.FunctionCoverage.getNumFunctions() << '\n'
  48      << "FNH:" << Summary.FunctionCoverage.getExecuted() << '\n';
  49 }
  50
  51 void renderFunctions(
  52     raw_ostream &OS,
  53     const iterator_range<coverage::FunctionRecordIterator> &Functions) {
  54   for (const auto &F : Functions) {
  55     auto StartLine = F.CountedRegions.front().LineStart;
  56     OS << "FN:" << StartLine << ',' << F.Name << '\n';
  57   }
  58   for (const auto &F : Functions)
  59     OS << "FNDA:" << F.ExecutionCount << ',' << F.Name << '\n';
  60 }
  61
  62 void renderLineExecutionCounts(raw_ostream &OS,
  63                                const coverage::CoverageData &FileCoverage) {
  64   coverage::LineCoverageIterator LCI{FileCoverage, 1};
  65   coverage::LineCoverageIterator LCIEnd = LCI.getEnd();
  66   for (; LCI != LCIEnd; ++LCI) {
  67     const coverage::LineCoverageStats &LCS = *LCI;
  68     if (LCS.isMapped()) {
  69       OS << "DA:" << LCS.getLine() << ',' << LCS.getExecutionCount() << '\n';
  70     }
  71   }
  72 }
  73
  74 void renderLineSummary(raw_ostream &OS, const FileCoverageSummary &Summary) {
  75   OS << "LF:" << Summary.LineCoverage.getNumLines() << '\n'
  76      << "LH:" << Summary.LineCoverage.getCovered() << '\n';
  77 }
  78
  79 void renderFile(raw_ostream &OS, const coverage::CoverageMapping &Coverage,
  80                 const std::string &Filename,
  81                 const FileCoverageSummary &FileReport, bool ExportSummaryOnly) {
  82   OS << "SF:" << Filename << '\n';
  83
  84   if (!ExportSummaryOnly) {
  85     renderFunctions(OS, Coverage.getCoveredFunctions(Filename));
  86   }
  87   renderFunctionSummary(OS, FileReport);
  88
  89   if (!ExportSummaryOnly) {
  90     // Calculate and render detailed coverage information for given file.
  91     auto FileCoverage = Coverage.getCoverageForFile(Filename);
  92     renderLineExecutionCounts(OS, FileCoverage);
  93   }
  94   renderLineSummary(OS, FileReport);
  95
  96   OS << "end_of_record\n";
  97 }
  98
  99 void renderFiles(raw_ostream &OS, const coverage::CoverageMapping &Coverage,
 100                  ArrayRef<std::string> SourceFiles,
 101                  ArrayRef<FileCoverageSummary> FileReports,
 102                  bool ExportSummaryOnly) {
 103   for (unsigned I = 0, E = SourceFiles.size(); I < E; ++I)
 104     renderFile(OS, Coverage, SourceFiles[I], FileReports[I], ExportSummaryOnly);
 105 }
 106
 107 } // end anonymous namespace
 108
 109 void CoverageExporterLcov::renderRoot(const CoverageFilters &IgnoreFilters) {
 110   std::vector<std::string> SourceFiles;
 111   for (StringRef SF : Coverage.getUniqueSourceFiles()) {
 112     if (!IgnoreFilters.matchesFilename(SF))
 113       SourceFiles.emplace_back(SF);
 114   }
 115   renderRoot(SourceFiles);
 116 }
 117
 118 void CoverageExporterLcov::renderRoot(ArrayRef<std::string> SourceFiles) {
 119   FileCoverageSummary Totals = FileCoverageSummary("Totals");
 120   auto FileReports = CoverageReport::prepareFileReports(Coverage, Totals,
 121                                                         SourceFiles, Options);
 122   renderFiles(OS, Coverage, SourceFiles, FileReports,
 123               Options.ExportSummaryOnly);
 124 }