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//===- yaml2obj - Convert YAML to a binary object file --------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This program takes a YAML description of an object file and outputs the
// binary equivalent.
//
// This is used for writing tests that require binary files.
//
//===----------------------------------------------------------------------===//
#include "yaml2obj.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/YAMLTraits.h"
#include "llvm/Support/raw_ostream.h"
#include <system_error>
using namespace llvm;
static cl::opt<std::string>
Input(cl::Positional, cl::desc("<input>"), cl::init("-"));
// TODO: The "right" way to tell what kind of object file a given YAML file
// corresponds to is to look at YAML "tags" (e.g. `!Foo`). Then, different
// tags (`!ELF`, `!COFF`, etc.) would be used to discriminate between them.
// Interpreting the tags is needed eventually for when writing test cases,
// so that we can e.g. have `!Archive` contain a sequence of `!ELF`, and
// just Do The Right Thing. However, interpreting these tags and acting on
// them appropriately requires some work in the YAML parser and the YAMLIO
// library.
enum YAMLObjectFormat {
YOF_COFF,
YOF_ELF
};
cl::opt<YAMLObjectFormat> Format(
"format",
cl::desc("Interpret input as this type of object file"),
cl::values(
clEnumValN(YOF_COFF, "coff", "COFF object file format"),
clEnumValN(YOF_ELF, "elf", "ELF object file format"),
clEnumValEnd));
cl::opt<unsigned>
DocNum("docnum", cl::init(1),
cl::desc("Read specified document from input (default = 1)"));
static cl::opt<std::string> OutputFilename("o", cl::desc("Output filename"),
cl::value_desc("filename"));
typedef int (*ConvertFuncPtr)(yaml::Input & YIn, raw_ostream &Out);
static int convertYAML(yaml::Input &YIn, raw_ostream &Out,
ConvertFuncPtr Convert) {
unsigned CurDocNum = 0;
do {
if (++CurDocNum == DocNum)
return Convert(YIn, Out);
} while (YIn.nextDocument());
errs() << "yaml2obj: Cannot find the " << DocNum
<< llvm::getOrdinalSuffix(DocNum) << " document\n";
return 1;
}
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv);
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
if (OutputFilename.empty())
OutputFilename = "-";
std::error_code EC;
std::unique_ptr<tool_output_file> Out(
new tool_output_file(OutputFilename, EC, sys::fs::F_None));
if (EC) {
errs() << EC.message() << '\n';
return 1;
}
ErrorOr<std::unique_ptr<MemoryBuffer>> Buf =
MemoryBuffer::getFileOrSTDIN(Input);
if (!Buf)
return 1;
ConvertFuncPtr Convert = nullptr;
if (Format == YOF_COFF)
Convert = yaml2coff;
else if (Format == YOF_ELF)
Convert = yaml2elf;
else {
errs() << "Not yet implemented\n";
return 1;
}
yaml::Input YIn(Buf.get()->getBuffer());
int Res = convertYAML(YIn, Out->os(), Convert);
if (Res == 0)
Out->keep();
return Res;
}
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