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/Support/CommandLine.h" 20 #include "llvm/Support/FileSystem.h" 21 #include "llvm/Support/ManagedStatic.h" 22 #include "llvm/Support/MemoryBuffer.h" 23 #include "llvm/Support/PrettyStackTrace.h" 24 #include "llvm/Support/Signals.h" 25 #include "llvm/Support/ToolOutputFile.h" 26 #include "llvm/Support/YAMLTraits.h" 27 #include "llvm/Support/raw_ostream.h" 28 #include <system_error> 29 30 using namespace llvm; 31 32 static cl::opt<std::string> 33 Input(cl::Positional, cl::desc("<input>"), cl::init("-")); 34 35 // TODO: The "right" way to tell what kind of object file a given YAML file 36 // corresponds to is to look at YAML "tags" (e.g. `!Foo`). Then, different 37 // tags (`!ELF`, `!COFF`, etc.) would be used to discriminate between them. 38 // Interpreting the tags is needed eventually for when writing test cases, 39 // so that we can e.g. have `!Archive` contain a sequence of `!ELF`, and 40 // just Do The Right Thing. However, interpreting these tags and acting on 41 // them appropriately requires some work in the YAML parser and the YAMLIO 42 // library. 43 enum YAMLObjectFormat { 44 YOF_COFF, 45 YOF_ELF 46 }; 47 48 cl::opt<YAMLObjectFormat> Format( 49 "format", 50 cl::desc("Interpret input as this type of object file"), 51 cl::values( 52 clEnumValN(YOF_COFF, "coff", "COFF object file format"), 53 clEnumValN(YOF_ELF, "elf", "ELF object file format"), 54 clEnumValEnd)); 55 56 cl::opt<unsigned> 57 DocNum("docnum", cl::init(1), 58 cl::desc("Read specified document from input (default = 1)")); 59 60 static cl::opt<std::string> OutputFilename("o", cl::desc("Output filename"), 61 cl::value_desc("filename")); 62 63 typedef int (*ConvertFuncPtr)(yaml::Input & YIn, raw_ostream &Out); 64 65 int convertYAML(yaml::Input & YIn, raw_ostream &Out, ConvertFuncPtr Convert) { 66 unsigned CurDocNum = 0; 67 do { 68 if (++CurDocNum == DocNum) 69 return Convert(YIn, Out); 70 } while (YIn.nextDocument()); 71 72 errs() << "yaml2obj: Cannot find the " << DocNum 73 << llvm::getOrdinalSuffix(DocNum) << " document\n"; 74 return 1; 75 } 76 77 int main(int argc, char **argv) { 78 cl::ParseCommandLineOptions(argc, argv); 79 sys::PrintStackTraceOnErrorSignal(); 80 PrettyStackTraceProgram X(argc, argv); 81 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 82 83 if (OutputFilename.empty()) 84 OutputFilename = "-"; 85 86 std::string ErrorInfo; 87 std::unique_ptr<tool_output_file> Out( 88 new tool_output_file(OutputFilename.c_str(), ErrorInfo, sys::fs::F_None)); 89 if (!ErrorInfo.empty()) { 90 errs() << ErrorInfo << '\n'; 91 return 1; 92 } 93 94 ErrorOr<std::unique_ptr<MemoryBuffer>> Buf = 95 MemoryBuffer::getFileOrSTDIN(Input); 96 if (!Buf) 97 return 1; 98 99 ConvertFuncPtr Convert = nullptr; 100 if (Format == YOF_COFF) 101 Convert = yaml2coff; 102 else if (Format == YOF_ELF) 103 Convert = yaml2elf; 104 else { 105 errs() << "Not yet implemented\n"; 106 return 1; 107 } 108 109 yaml::Input YIn(Buf.get()->getBuffer()); 110 111 int Res = convertYAML(YIn, Out->os(), Convert); 112 if (Res == 0) 113 Out->keep(); 114 115 return Res; 116 } 117
