| //===-- llvm-dis.cpp - The low-level LLVM disassembler --------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by the LLVM research group and is distributed under |
| // the University of Illinois Open Source License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This utility may be invoked in the following manner: |
| // llvm-dis [options] - Read LLVM bytecode from stdin, write asm to stdout |
| // llvm-dis [options] x.bc - Read LLVM bytecode from the x.bc file, write asm |
| // to the x.ll file. |
| // Options: |
| // --help - Output information about command line switches |
| // -c - Print C code instead of LLVM assembly |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/Module.h" |
| #include "llvm/PassManager.h" |
| #include "llvm/Bytecode/Reader.h" |
| #include "llvm/Assembly/CWriter.h" |
| #include "llvm/Assembly/PrintModulePass.h" |
| #include "Support/CommandLine.h" |
| #include "Support/Signals.h" |
| #include <fstream> |
| #include <memory> |
| |
| // OutputMode - The different orderings to print basic blocks in... |
| enum OutputMode { |
| LLVM = 0, // Generate LLVM assembly (the default) |
| c, // Generate C code |
| }; |
| |
| using namespace llvm; |
| |
| static cl::opt<std::string> |
| InputFilename(cl::Positional, cl::desc("<input bytecode>"), 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")); |
| |
| static cl::opt<enum OutputMode> |
| WriteMode(cl::desc("Specify the output format:"), |
| cl::values(clEnumVal(LLVM, "Output LLVM assembly"), |
| clEnumVal(c, "Output C code for program"), |
| 0)); |
| |
| int main(int argc, char **argv) { |
| cl::ParseCommandLineOptions(argc, argv, " llvm .bc -> .ll disassembler\n"); |
| std::ostream *Out = &std::cout; // Default to printing to stdout... |
| std::string ErrorMessage; |
| |
| std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, &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! Sending to standard output.\n"; |
| } else { |
| Out = new std::ofstream(OutputFilename.c_str()); |
| } |
| } |
| } else { |
| if (InputFilename == "-") { |
| OutputFilename = "-"; |
| } else { |
| std::string IFN = InputFilename; |
| int Len = IFN.length(); |
| if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') { |
| // Source ends in .bc |
| OutputFilename = std::string(IFN.begin(), IFN.end()-3); |
| } else { |
| OutputFilename = IFN; // Append a .ll to it |
| } |
| if (WriteMode == c) |
| OutputFilename += ".c"; |
| else |
| OutputFilename += ".ll"; |
| |
| 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! Sending to standard output.\n"; |
| } else { |
| Out = new std::ofstream(OutputFilename.c_str()); |
| |
| // Make sure that the Out file gets unlinked from the disk if we get a |
| // SIGINT |
| RemoveFileOnSignal(OutputFilename); |
| } |
| } |
| } |
| |
| if (!Out->good()) { |
| std::cerr << argv[0] << ": error opening " << OutputFilename |
| << ": sending to stdout instead!\n"; |
| Out = &std::cout; |
| } |
| |
| // All that dis does is write the assembly or C out to a file... |
| // |
| PassManager Passes; |
| |
| switch (WriteMode) { |
| case LLVM: // Output LLVM assembly |
| Passes.add(new PrintModulePass(Out)); |
| break; |
| case c: // Convert LLVM to C |
| Passes.add(createWriteToCPass(*Out)); |
| break; |
| } |
| |
| Passes.run(*M.get()); |
| |
| if (Out != &std::cout) { |
| ((std::ofstream*)Out)->close(); |
| delete Out; |
| } |
| return 0; |
| } |
| |