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/raw_ostream.h"
12 #include "llvm/Support/LEB128.h"
13 #include "llvm/Support/CommandLine.h"
14 #include "llvm/Support/ManagedStatic.h"
15 #include "llvm/Support/MemoryObject.h"
16 #include "llvm/Support/Signals.h"
17 #include "llvm/Support/PrettyStackTrace.h"
18 #include <system_error>
19 #include <functional>
20 
21 using namespace llvm;
22 using namespace object;
23 
24 int convert_for_testing_main(int argc, const char **argv) {
25   sys::PrintStackTraceOnErrorSignal();
26   PrettyStackTraceProgram X(argc, argv);
27   llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
28 
29   cl::opt<std::string> InputSourceFile(cl::Positional, cl::Required,
30                                        cl::desc("<Source file>"));
31 
32   cl::opt<std::string> OutputFilename(
33       "o", cl::Required,
34       cl::desc(
35           "File with the profile data obtained after an instrumented run"));
36 
37   cl::ParseCommandLineOptions(argc, argv, "LLVM code coverage tool\n");
38 
39   auto ObjErr = llvm::object::ObjectFile::createObjectFile(InputSourceFile);
40   if (auto Err = ObjErr.getError()) {
41     errs() << "error: " << Err.message() << "\n";
42     return 1;
43   }
44   ObjectFile *OF = ObjErr.get().getBinary().get();
45   auto BytesInAddress = OF->getBytesInAddress();
46   if (BytesInAddress != 8) {
47     errs() << "error: 64 bit binary expected\n";
48     return 1;
49   }
50 
51   // Look for the sections that we are interested in.
52   int FoundSectionCount = 0;
53   SectionRef ProfileNames, CoverageMapping;
54   for (const auto &Section : OF->sections()) {
55     StringRef Name;
56     if (Section.getName(Name))
57       return 1;
58     if (Name == "__llvm_prf_names") {
59       ProfileNames = Section;
60     } else if (Name == "__llvm_covmap") {
61       CoverageMapping = Section;
62     } else
63       continue;
64     ++FoundSectionCount;
65   }
66   if (FoundSectionCount != 2)
67     return 1;
68 
69   // Get the contents of the given sections.
70   StringRef CoverageMappingData;
71   uint64_t ProfileNamesAddress;
72   StringRef ProfileNamesData;
73   if (CoverageMapping.getContents(CoverageMappingData) ||
74       ProfileNames.getAddress(ProfileNamesAddress) ||
75       ProfileNames.getContents(ProfileNamesData))
76     return 1;
77 
78   int FD;
79   if (auto Err =
80           sys::fs::openFileForWrite(OutputFilename, FD, sys::fs::F_None)) {
81     errs() << "error: " << Err.message() << "\n";
82     return 1;
83   }
84 
85   raw_fd_ostream OS(FD, true);
86   OS << "llvmcovmtestdata";
87   encodeULEB128(ProfileNamesData.size(), OS);
88   encodeULEB128(ProfileNamesAddress, OS);
89   OS << ProfileNamesData << CoverageMappingData;
90 
91   return 0;
92 }
93