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//===-- llvm-dis.cpp - The low-level LLVM disassembler --------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file 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 bitcode from stdin, write asm to stdout
// llvm-dis [options] x.bc - Read LLVM bitcode from the x.bc file, write asm
// to the x.ll file.
// Options:
// --help - Output information about command line switches
//
//===----------------------------------------------------------------------===//
#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/Assembly/PrintModulePass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/System/Signals.h"
#include <memory>
using namespace llvm;
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input bitcode>"), 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) {
// Print a stack trace if we signal out.
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
LLVMContext &Context = getGlobalContext();
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv, "llvm .bc -> .ll disassembler\n");
std::string ErrorMessage;
std::auto_ptr<Module> M;
if (MemoryBuffer *Buffer
= MemoryBuffer::getFileOrSTDIN(InputFilename, &ErrorMessage)) {
M.reset(ParseBitcodeFile(Buffer, Context, &ErrorMessage));
delete Buffer;
}
if (M.get() == 0) {
errs() << argv[0] << ": ";
if (ErrorMessage.size())
errs() << ErrorMessage << "\n";
else
errs() << "bitcode didn't read correctly.\n";
return 1;
}
// Just use stdout. We won't actually print anything on it.
if (DontPrint)
OutputFilename = "-";
if (OutputFilename.empty()) { // Unspecified output, infer it.
if (InputFilename == "-") {
OutputFilename = "-";
} else {
const std::string &IFN = InputFilename;
int Len = IFN.length();
// If the source ends in .bc, strip it off.
if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c')
OutputFilename = std::string(IFN.begin(), IFN.end()-3)+".ll";
else
OutputFilename = IFN+".ll";
}
}
std::string ErrorInfo;
std::auto_ptr<raw_fd_ostream>
Out(new raw_fd_ostream(OutputFilename.c_str(), ErrorInfo,
(Force?raw_fd_ostream::F_Force : 0) |
raw_fd_ostream::F_Binary));
if (!ErrorInfo.empty()) {
errs() << ErrorInfo << '\n';
if (!Force)
errs() << "Use -f command line argument to force output\n";
return 1;
}
// Make sure that the Out file gets unlinked from the disk if we get a
// SIGINT.
if (OutputFilename != "-")
sys::RemoveFileOnSignal(sys::Path(OutputFilename));
// All that llvm-dis does is write the assembly to a file.
if (!DontPrint) {
PassManager Passes;
Passes.add(createPrintModulePass(Out.get()));
Passes.run(*M.get());
}
return 0;
}
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