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