forked from OSchip/llvm-project
124 lines
4.1 KiB
C++
124 lines
4.1 KiB
C++
//===-- llvm-dis.cpp - The low-level LLVM disassembler --------------------===//
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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 the LLVM research group and is distributed under
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// the 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 utility may be invoked in the following manner:
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// llvm-dis [options] - Read LLVM bytecode from stdin, write asm to stdout
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// llvm-dis [options] x.bc - Read LLVM bytecode from the x.bc file, write asm
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// to the x.ll file.
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// Options:
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// --help - Output information about command line switches
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/Assembly/PrintModulePass.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/Streams.h"
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#include "llvm/System/Signals.h"
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#include <iostream>
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#include <fstream>
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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 bytecode>"), 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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llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
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try {
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cl::ParseCommandLineOptions(argc, argv, " llvm .bc -> .ll disassembler\n");
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sys::PrintStackTraceOnErrorSignal();
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std::ostream *Out = &std::cout; // Default to printing to stdout.
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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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cerr << argv[0] << ": ";
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if (ErrorMessage.size())
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cerr << ErrorMessage << "\n";
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else
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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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cerr << argv[0] << ": error opening '" << OutputFilename
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<< "': file exists! Sending to standard output.\n";
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} else {
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Out = new std::ofstream(OutputFilename.c_str());
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}
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}
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} else {
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if (InputFilename == "-") {
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OutputFilename = "-";
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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] == 'b' && IFN[Len-1] == 'c') {
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// Source ends in .bc
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OutputFilename = std::string(IFN.begin(), IFN.end()-3)+".ll";
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} else {
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OutputFilename = IFN+".ll";
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}
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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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cerr << argv[0] << ": error opening '" << OutputFilename
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<< "': file exists! Sending to standard output.\n";
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} else {
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Out = new std::ofstream(OutputFilename.c_str());
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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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}
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if (!Out->good()) {
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cerr << argv[0] << ": error opening " << OutputFilename
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<< ": sending to stdout instead!\n";
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Out = &std::cout;
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}
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// All that llvm-dis does is write the assembly to a file.
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PassManager Passes;
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OStream L(*Out);
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Passes.add(new PrintModulePass(&L));
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Passes.run(*M.get());
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if (Out != &std::cout) {
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((std::ofstream*)Out)->close();
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delete Out;
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}
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return 0;
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} catch (const std::string& msg) {
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cerr << argv[0] << ": " << msg << "\n";
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} catch (...) {
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cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
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}
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return 1;
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}
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