tools/yaml2obj/yaml2obj.cpp

   1 //===- yaml2obj - Convert YAML to a binary object file --------------------===//
   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 // This program takes a YAML description of an object file and outputs the
  11 // binary equivalent.
  12 //
  13 // This is used for writing tests that require binary files.
  14 //
  15 //===----------------------------------------------------------------------===//
  16
  17 #include "yaml2obj.h"
  18 #include "llvm/ADT/StringExtras.h"
  19 #include "llvm/ObjectYAML/ObjectYAML.h"
  20 #include "llvm/Support/CommandLine.h"
  21 #include "llvm/Support/FileSystem.h"
  22 #include "llvm/Support/InitLLVM.h"
  23 #include "llvm/Support/MemoryBuffer.h"
  24 #include "llvm/Support/ToolOutputFile.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 LLVM_ATTRIBUTE_NORETURN static void error(Twine Message) {
  42   errs() << Message << "\n";
  43   exit(1);
  44 }
  45
  46 static int convertYAML(yaml::Input &YIn, raw_ostream &Out) {
  47   unsigned CurDocNum = 0;
  48   do {
  49     if (++CurDocNum == DocNum) {
  50       yaml::YamlObjectFile Doc;
  51       YIn >> Doc;
  52       if (YIn.error())
  53         error("yaml2obj: Failed to parse YAML file!");
  54       if (Doc.Elf)
  55         return yaml2elf(*Doc.Elf, Out);
  56       if (Doc.Coff)
  57         return yaml2coff(*Doc.Coff, Out);
  58       if (Doc.MachO || Doc.FatMachO)
  59         return yaml2macho(Doc, Out);
  60       if (Doc.Wasm)
  61         return yaml2wasm(*Doc.Wasm, Out);
  62       error("yaml2obj: Unknown document type!");
  63     }
  64   } while (YIn.nextDocument());
  65
  66   error("yaml2obj: Cannot find the " + Twine(DocNum) +
  67         llvm::getOrdinalSuffix(DocNum) + " document");
  68 }
  69
  70 int main(int argc, char **argv) {
  71   InitLLVM X(argc, argv);
  72   cl::ParseCommandLineOptions(argc, argv);
  73
  74   if (OutputFilename.empty())
  75     OutputFilename = "-";
  76
  77   std::error_code EC;
  78   std::unique_ptr<ToolOutputFile> Out(
  79       new ToolOutputFile(OutputFilename, EC, sys::fs::F_None));
  80   if (EC)
  81     error("yaml2obj: Error opening '" + OutputFilename + "': " + EC.message());
  82
  83   ErrorOr<std::unique_ptr<MemoryBuffer>> Buf =
  84       MemoryBuffer::getFileOrSTDIN(Input);
  85   if (!Buf)
  86     return 1;
  87
  88   yaml::Input YIn(Buf.get()->getBuffer());
  89
  90   int Res = convertYAML(YIn, Out->os());
  91   if (Res == 0)
  92     Out->keep();
  93
  94   Out->os().flush();
  95   return Res;
  96 }