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