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/Support/CommandLine.h"
19 #include "llvm/Support/ManagedStatic.h"
20 #include "llvm/Support/MemoryBuffer.h"
21 #include "llvm/Support/PrettyStackTrace.h"
22 #include "llvm/Support/Signals.h"
23 #include "llvm/Support/raw_ostream.h"
24 #include "llvm/Support/system_error.h"
25 
26 using namespace llvm;
27 
28 static cl::opt<std::string>
29   Input(cl::Positional, cl::desc("<input>"), cl::init("-"));
30 
31 // TODO: The "right" way to tell what kind of object file a given YAML file
32 // corresponds to is to look at YAML "tags" (e.g. `!Foo`). Then, different
33 // tags (`!ELF`, `!COFF`, etc.) would be used to discriminate between them.
34 // Interpreting the tags is needed eventually for when writing test cases,
35 // so that we can e.g. have `!Archive` contain a sequence of `!ELF`, and
36 // just Do The Right Thing. However, interpreting these tags and acting on
37 // them appropriately requires some work in the YAML parser and the YAMLIO
38 // library.
39 enum YAMLObjectFormat {
40   YOF_COFF,
41   YOF_ELF
42 };
43 
44 cl::opt<YAMLObjectFormat> Format(
45   "format",
46   cl::desc("Interpret input as this type of object file"),
47   cl::values(
48     clEnumValN(YOF_COFF, "coff", "COFF object file format"),
49     clEnumValN(YOF_ELF, "elf", "ELF object file format"),
50   clEnumValEnd));
51 
52 
53 int main(int argc, char **argv) {
54   cl::ParseCommandLineOptions(argc, argv);
55   sys::PrintStackTraceOnErrorSignal();
56   PrettyStackTraceProgram X(argc, argv);
57   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
58 
59   std::unique_ptr<MemoryBuffer> Buf;
60   if (MemoryBuffer::getFileOrSTDIN(Input, Buf))
61     return 1;
62   if (Format == YOF_COFF) {
63     return yaml2coff(outs(), Buf.get());
64   } else if (Format == YOF_ELF) {
65     return yaml2elf(outs(), Buf.get());
66   } else {
67     errs() << "Not yet implemented\n";
68     return 1;
69   }
70 }
71