tools/llvm-cov/TestingSupport.cpp

   1 //===- TestingSupport.cpp - Convert objects files into test files --------===//
   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 #include "llvm/Object/ObjectFile.h"
  10 #include "llvm/ProfileData/InstrProf.h"
  11 #include "llvm/Support/Alignment.h"
  12 #include "llvm/Support/CommandLine.h"
  13 #include "llvm/Support/LEB128.h"
  14 #include "llvm/Support/raw_ostream.h"
  15 #include <functional>
  16 #include <system_error>
  17
  18 using namespace llvm;
  19 using namespace object;
  20
  21 int convertForTestingMain(int argc, const char *argv[]) {
  22   cl::opt<std::string> InputSourceFile(cl::Positional, cl::Required,
  23                                        cl::desc("<Source file>"));
  24
  25   cl::opt<std::string> OutputFilename(
  26       "o", cl::Required,
  27       cl::desc(
  28           "File with the profile data obtained after an instrumented run"));
  29
  30   cl::ParseCommandLineOptions(argc, argv, "LLVM code coverage tool\n");
  31
  32   auto ObjErr = llvm::object::ObjectFile::createObjectFile(InputSourceFile);
  33   if (!ObjErr) {
  34     std::string Buf;
  35     raw_string_ostream OS(Buf);
  36     logAllUnhandledErrors(ObjErr.takeError(), OS);
  37     OS.flush();
  38     errs() << "error: " << Buf;
  39     return 1;
  40   }
  41   ObjectFile *OF = ObjErr.get().getBinary();
  42   auto BytesInAddress = OF->getBytesInAddress();
  43   if (BytesInAddress != 8) {
  44     errs() << "error: 64 bit binary expected\n";
  45     return 1;
  46   }
  47
  48   // Look for the sections that we are interested in.
  49   int FoundSectionCount = 0;
  50   SectionRef ProfileNames, CoverageMapping;
  51   auto ObjFormat = OF->getTripleObjectFormat();
  52   for (const auto &Section : OF->sections()) {
  53     StringRef Name;
  54     if (Expected<StringRef> NameOrErr = Section.getName()) {
  55       Name = *NameOrErr;
  56     } else {
  57       consumeError(NameOrErr.takeError());
  58       return 1;
  59     }
  60
  61     if (Name == llvm::getInstrProfSectionName(IPSK_name, ObjFormat,
  62                                               /*AddSegmentInfo=*/false)) {
  63       ProfileNames = Section;
  64     } else if (Name == llvm::getInstrProfSectionName(
  65                            IPSK_covmap, ObjFormat, /*AddSegmentInfo=*/false)) {
  66       CoverageMapping = Section;
  67     } else
  68       continue;
  69     ++FoundSectionCount;
  70   }
  71   if (FoundSectionCount != 2)
  72     return 1;
  73
  74   // Get the contents of the given sections.
  75   uint64_t ProfileNamesAddress = ProfileNames.getAddress();
  76   StringRef CoverageMappingData;
  77   StringRef ProfileNamesData;
  78   if (Expected<StringRef> E = CoverageMapping.getContents())
  79     CoverageMappingData = *E;
  80   else {
  81     consumeError(E.takeError());
  82     return 1;
  83   }
  84   if (Expected<StringRef> E = ProfileNames.getContents())
  85     ProfileNamesData = *E;
  86   else {
  87     consumeError(E.takeError());
  88     return 1;
  89   }
  90
  91   int FD;
  92   if (auto Err = sys::fs::openFileForWrite(OutputFilename, FD)) {
  93     errs() << "error: " << Err.message() << "\n";
  94     return 1;
  95   }
  96
  97   raw_fd_ostream OS(FD, true);
  98   OS << "llvmcovmtestdata";
  99   encodeULEB128(ProfileNamesData.size(), OS);
 100   encodeULEB128(ProfileNamesAddress, OS);
 101   OS << ProfileNamesData;
 102   // Coverage mapping data is expected to have an alignment of 8.
 103   for (unsigned Pad = offsetToAlignment(OS.tell(), llvm::Align(8)); Pad; --Pad)
 104     OS.write(uint8_t(0));
 105   OS << CoverageMappingData;
 106
 107   return 0;
 108 }