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/Support/CommandLine.h"
12 #include "llvm/Support/LEB128.h"
13 #include "llvm/Support/ManagedStatic.h"
14 #include "llvm/Support/PrettyStackTrace.h"
15 #include "llvm/Support/Signals.h"
16 #include "llvm/Support/raw_ostream.h"
17 #include <functional>
18 #include <system_error>
19
20 using namespace llvm;
21 using namespace object;
22
convertForTestingMain(int argc,const char * argv[])23 int convertForTestingMain(int argc, const char *argv[]) {
24 sys::PrintStackTraceOnErrorSignal();
25 PrettyStackTraceProgram X(argc, argv);
26 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
27
28 cl::opt<std::string> InputSourceFile(cl::Positional, cl::Required,
29 cl::desc("<Source file>"));
30
31 cl::opt<std::string> OutputFilename(
32 "o", cl::Required,
33 cl::desc(
34 "File with the profile data obtained after an instrumented run"));
35
36 cl::ParseCommandLineOptions(argc, argv, "LLVM code coverage tool\n");
37
38 auto ObjErr = llvm::object::ObjectFile::createObjectFile(InputSourceFile);
39 if (auto Err = ObjErr.getError()) {
40 errs() << "error: " << Err.message() << "\n";
41 return 1;
42 }
43 ObjectFile *OF = ObjErr.get().getBinary();
44 auto BytesInAddress = OF->getBytesInAddress();
45 if (BytesInAddress != 8) {
46 errs() << "error: 64 bit binary expected\n";
47 return 1;
48 }
49
50 // Look for the sections that we are interested in.
51 int FoundSectionCount = 0;
52 SectionRef ProfileNames, CoverageMapping;
53 for (const auto &Section : OF->sections()) {
54 StringRef Name;
55 if (Section.getName(Name))
56 return 1;
57 if (Name == "__llvm_prf_names") {
58 ProfileNames = Section;
59 } else if (Name == "__llvm_covmap") {
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 (CoverageMapping.getContents(CoverageMappingData) ||
73 ProfileNames.getContents(ProfileNamesData))
74 return 1;
75
76 int FD;
77 if (auto Err =
78 sys::fs::openFileForWrite(OutputFilename, FD, sys::fs::F_None)) {
79 errs() << "error: " << Err.message() << "\n";
80 return 1;
81 }
82
83 raw_fd_ostream OS(FD, true);
84 OS << "llvmcovmtestdata";
85 encodeULEB128(ProfileNamesData.size(), OS);
86 encodeULEB128(ProfileNamesAddress, OS);
87 OS << ProfileNamesData << CoverageMappingData;
88
89 return 0;
90 }
91