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//===--- llvm2cpp.cpp - LLVM IR to C++ Translator -------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Reid Spencer and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This program converts an input LLVM assembly file (.ll) into a C++ source
// file that makes calls to the LLVM C++ API to produce the same module. The
// generated program verifies what it built and then runs the PrintAssemblyPass
// to reproduce the input originally given to llvm2cpp.
//
// Use the --help option for help with command line options.
//
//===------------------------------------------------------------------------===
#include "llvm/Module.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/Bytecode/Reader.h"
#include "llvm/Analysis/Verifier.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SystemUtils.h"
#include "llvm/System/Signals.h"
#include "CppWriter.h"
#include <fstream>
#include <iostream>
#include <memory>
using namespace llvm;
cl::opt<bool> Bitcode("bitcode");
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input LLVM bytecode file>"),
cl::init("-"));
static cl::opt<std::string>
OutputFilename("o", cl::desc("Override output filename"),
cl::value_desc("filename"));
static cl::opt<bool>
Force("f", cl::desc("Overwrite output files"));
int main(int argc, char **argv) {
llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv, " llvm .ll -> .cpp assembler\n");
sys::PrintStackTraceOnErrorSignal();
int exitCode = 0;
std::ostream *Out = 0;
std::string ErrorMessage;
std::auto_ptr<Module> M;
if (Bitcode) {
std::auto_ptr<MemoryBuffer> Buffer(
MemoryBuffer::getFileOrSTDIN(&InputFilename[0], InputFilename.size()));
if (Buffer.get())
M.reset(ParseBitcodeFile(Buffer.get(), &ErrorMessage));
else
ErrorMessage = "Error reading file '" + InputFilename + "'";
} else {
M.reset(ParseBytecodeFile(InputFilename,
Compressor::decompressToNewBuffer,
&ErrorMessage));
}
if (M.get() == 0) {
std::cerr << argv[0] << ": ";
if (ErrorMessage.size())
std::cerr << ErrorMessage << "\n";
else
std::cerr << "bytecode didn't read correctly.\n";
return 1;
}
if (OutputFilename != "") { // Specified an output filename?
if (OutputFilename != "-") { // Not stdout?
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
std::cerr << argv[0] << ": error opening '" << OutputFilename
<< "': file exists!\n"
<< "Use -f command line argument to force output\n";
return 1;
}
Out = new std::ofstream(OutputFilename.c_str(), std::ios::out |
std::ios::trunc | std::ios::binary);
} else { // Specified stdout
Out = &std::cout;
}
} else {
if (InputFilename == "-") {
OutputFilename = "-";
Out = &std::cout;
} else {
std::string IFN = InputFilename;
int Len = IFN.length();
if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
// Source ends in .ll
OutputFilename = std::string(IFN.begin(), IFN.end()-3);
} else {
OutputFilename = IFN; // Append a .cpp to it
}
OutputFilename += ".cpp";
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
std::cerr << argv[0] << ": error opening '" << OutputFilename
<< "': file exists!\n"
<< "Use -f command line argument to force output\n";
return 1;
}
Out = new std::ofstream(OutputFilename.c_str(), std::ios::out |
std::ios::trunc | std::ios::binary);
// Make sure that the Out file gets unlinked from the disk if we get a
// SIGINT
sys::RemoveFileOnSignal(sys::Path(OutputFilename));
}
}
if (!Out->good()) {
std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
return 1;
}
WriteModuleToCppFile(M.get(), *Out);
if (Out != &std::cout) delete Out;
return exitCode;
}
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