tools/yaml2obj/yaml2obj.cpp

   1 //===- yaml2obj - Convert YAML to a binary object file --------------------===//
   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 // This program takes a YAML description of an object file and outputs the
  10 // binary equivalent.
  11 //
  12 // This is used for writing tests that require binary files.
  13 //
  14 //===----------------------------------------------------------------------===//
  15
  16 #include "llvm/ObjectYAML/yaml2obj.h"
  17 #include "llvm/ADT/StringExtras.h"
  18 #include "llvm/ObjectYAML/ObjectYAML.h"
  19 #include "llvm/Support/CommandLine.h"
  20 #include "llvm/Support/FileSystem.h"
  21 #include "llvm/Support/InitLLVM.h"
  22 #include "llvm/Support/MemoryBuffer.h"
  23 #include "llvm/Support/ToolOutputFile.h"
  24 #include "llvm/Support/WithColor.h"
  25 #include "llvm/Support/YAMLTraits.h"
  26 #include "llvm/Support/raw_ostream.h"
  27 #include <system_error>
  28
  29 using namespace llvm;
  30
  31 static cl::opt<std::string>
  32   Input(cl::Positional, cl::desc("<input>"), cl::init("-"));
  33
  34 cl::opt<unsigned>
  35 DocNum("docnum", cl::init(1),
  36        cl::desc("Read specified document from input (default = 1)"));
  37
  38 static cl::opt<std::string> OutputFilename("o", cl::desc("Output filename"),
  39                                            cl::value_desc("filename"));
  40
  41 int main(int argc, char **argv) {
  42   InitLLVM X(argc, argv);
  43   cl::ParseCommandLineOptions(argc, argv);
  44
  45   if (OutputFilename.empty())
  46     OutputFilename = "-";
  47
  48   auto ErrHandler = [](const Twine &Msg) {
  49     WithColor::error(errs(), "yaml2obj") << Msg << "\n";
  50   };
  51
  52   std::error_code EC;
  53   std::unique_ptr<ToolOutputFile> Out(
  54       new ToolOutputFile(OutputFilename, EC, sys::fs::OF_None));
  55   if (EC) {
  56     ErrHandler("failed to open '" + OutputFilename + "': " + EC.message());
  57     return 1;
  58   }
  59
  60   ErrorOr<std::unique_ptr<MemoryBuffer>> Buf =
  61       MemoryBuffer::getFileOrSTDIN(Input);
  62   if (!Buf)
  63     return 1;
  64
  65   yaml::Input YIn(Buf.get()->getBuffer());
  66   if (!convertYAML(YIn, Out->os(), ErrHandler, DocNum))
  67     return 1;
  68
  69   Out->keep();
  70   Out->os().flush();
  71   return 0;
  72 }