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//===-- 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
//
//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/Bytecode/Reader.h"
#include "llvm/Assembly/PrintModulePass.h"
#include "llvm/Support/Compressor.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Streams.h"
#include "llvm/System/Signals.h"
#include <iostream>
#include <fstream>
#include <memory>
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<bool>
DontPrint("disable-output", cl::desc("Don't output the .ll file"), cl::Hidden);
int main(int argc, char **argv) {
llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
try {
cl::ParseCommandLineOptions(argc, argv, " llvm .bc -> .ll disassembler\n");
sys::PrintStackTraceOnErrorSignal();
std::ostream *Out = &std::cout; // Default to printing to stdout.
std::string ErrorMessage;
std::auto_ptr<Module> M;
M.reset(ParseBitcodeFile(InputFilename, &ErrorMessage));
if (M.get() == 0)
M.reset(ParseBytecodeFile(InputFilename,Compressor::decompressToNewBuffer,
&ErrorMessage));
if (M.get() == 0) {
cerr << argv[0] << ": ";
if (ErrorMessage.size())
cerr << ErrorMessage << "\n";
else
cerr << "bytecode didn't read correctly.\n";
return 1;
}
if (DontPrint) {
// Just use stdout. We won't actually print anything on it.
} else 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!
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)+".ll";
} else {
OutputFilename = IFN+".ll";
}
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
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
sys::RemoveFileOnSignal(sys::Path(OutputFilename));
}
}
}
if (!Out->good()) {
cerr << argv[0] << ": error opening " << OutputFilename
<< ": sending to stdout instead!\n";
Out = &std::cout;
}
// All that llvm-dis does is write the assembly to a file.
if (!DontPrint) {
PassManager Passes;
OStream L(*Out);
Passes.add(new PrintModulePass(&L));
Passes.run(*M.get());
}
if (Out != &std::cout) {
((std::ofstream*)Out)->close();
delete Out;
}
return 0;
} catch (const std::string& msg) {
cerr << argv[0] << ": " << msg << "\n";
} catch (...) {
cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
}
return 1;
}
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