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 "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/YAMLTraits.h"
  25 #include "llvm/Support/raw_ostream.h"
  26 #include <system_error>
  27
  28 using namespace llvm;
  29
  30 static cl::opt<std::string>
  31   Input(cl::Positional, cl::desc("<input>"), cl::init("-"));
  32
  33 cl::opt<unsigned>
  34 DocNum("docnum", cl::init(1),
  35        cl::desc("Read specified document from input (default = 1)"));
  36
  37 static cl::opt<std::string> OutputFilename("o", cl::desc("Output filename"),
  38                                            cl::value_desc("filename"));
  39
  40 LLVM_ATTRIBUTE_NORETURN static void error(Twine Message) {
  41   errs() << Message << "\n";
  42   exit(1);
  43 }
  44
  45 static int convertYAML(yaml::Input &YIn, raw_ostream &Out) {
  46   unsigned CurDocNum = 0;
  47   do {
  48     if (++CurDocNum == DocNum) {
  49       yaml::YamlObjectFile Doc;
  50       YIn >> Doc;
  51       if (YIn.error())
  52         error("yaml2obj: Failed to parse YAML file!");
  53       if (Doc.Elf)
  54         return yaml2elf(*Doc.Elf, Out);
  55       if (Doc.Coff)
  56         return yaml2coff(*Doc.Coff, Out);
  57       if (Doc.MachO || Doc.FatMachO)
  58         return yaml2macho(Doc, Out);
  59       if (Doc.Minidump)
  60         return yaml2minidump(*Doc.Minidump, Out);
  61       if (Doc.Wasm)
  62         return yaml2wasm(*Doc.Wasm, Out);
  63       error("yaml2obj: Unknown document type!");
  64     }
  65   } while (YIn.nextDocument());
  66
  67   error("yaml2obj: Cannot find the " + Twine(DocNum) +
  68         llvm::getOrdinalSuffix(DocNum) + " document");
  69 }
  70
  71 int main(int argc, char **argv) {
  72   InitLLVM X(argc, argv);
  73   cl::ParseCommandLineOptions(argc, argv);
  74
  75   if (OutputFilename.empty())
  76     OutputFilename = "-";
  77
  78   std::error_code EC;
  79   std::unique_ptr<ToolOutputFile> Out(
  80       new ToolOutputFile(OutputFilename, EC, sys::fs::F_None));
  81   if (EC)
  82     error("yaml2obj: Error opening '" + OutputFilename + "': " + EC.message());
  83
  84   ErrorOr<std::unique_ptr<MemoryBuffer>> Buf =
  85       MemoryBuffer::getFileOrSTDIN(Input);
  86   if (!Buf)
  87     return 1;
  88
  89   StringRef Buffer = Buf.get()->getBuffer();
  90   if (Buffer.trim().size() == 0)
  91     error("yaml2obj: Error opening '" + Input + "': Empty File.");
  92   yaml::Input YIn(Buffer);
  93
  94   int Res = convertYAML(YIn, Out->os());
  95   if (Res == 0)
  96     Out->keep();
  97
  98   Out->os().flush();
  99   return Res;
 100 }