1 //===- TestingSupport.cpp - Convert objects files into test files --------===//
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 #include "llvm/Object/ObjectFile.h"
11 #include "llvm/ProfileData/InstrProf.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
convertForTestingMain(int argc,const char * argv[])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 for (const auto &Section : OF->sections()) {
52 StringRef Name;
53 if (Section.getName(Name))
54 return 1;
55 if (Name == llvm::getInstrProfNameSectionName(false)) {
56 ProfileNames = Section;
57 } else if (Name == llvm::getInstrProfCoverageSectionName(false)) {
58 CoverageMapping = Section;
59 } else
60 continue;
61 ++FoundSectionCount;
62 }
63 if (FoundSectionCount != 2)
64 return 1;
65
66 // Get the contents of the given sections.
67 uint64_t ProfileNamesAddress = ProfileNames.getAddress();
68 StringRef CoverageMappingData;
69 StringRef ProfileNamesData;
70 if (CoverageMapping.getContents(CoverageMappingData) ||
71 ProfileNames.getContents(ProfileNamesData))
72 return 1;
73
74 int FD;
75 if (auto Err =
76 sys::fs::openFileForWrite(OutputFilename, FD, sys::fs::F_None)) {
77 errs() << "error: " << Err.message() << "\n";
78 return 1;
79 }
80
81 raw_fd_ostream OS(FD, true);
82 OS << "llvmcovmtestdata";
83 encodeULEB128(ProfileNamesData.size(), OS);
84 encodeULEB128(ProfileNamesAddress, OS);
85 OS << ProfileNamesData;
86 // Coverage mapping data is expected to have an alignment of 8.
87 for (unsigned Pad = OffsetToAlignment(OS.tell(), 8); Pad; --Pad)
88 OS.write(uint8_t(0));
89 OS << CoverageMappingData;
90
91 return 0;
92 }
93