1 //===-- llvm-dis.cpp - The low-level LLVM disassembler --------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This utility may be invoked in the following manner:
11 // llvm-dis [options] - Read LLVM bytecode from stdin, write asm to stdout
12 // llvm-dis [options] x.bc - Read LLVM bytecode from the x.bc file, write asm
15 // --help - Output information about command line switches
17 //===----------------------------------------------------------------------===//
19 #include "llvm/Module.h"
20 #include "llvm/PassManager.h"
21 #include "llvm/Bytecode/Reader.h"
22 #include "llvm/Assembly/PrintModulePass.h"
23 #include "llvm/Support/CommandLine.h"
24 #include "llvm/Support/ManagedStatic.h"
25 #include "llvm/Support/Streams.h"
26 #include "llvm/System/Signals.h"
32 static cl::opt<std::string>
33 InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-"));
35 static cl::opt<std::string>
36 OutputFilename("o", cl::desc("Override output filename"),
37 cl::value_desc("filename"));
40 Force("f", cl::desc("Overwrite output files"));
43 DontPrint("disable-output", cl::desc("Don't output the .ll file"), cl::Hidden);
45 int main(int argc, char **argv) {
46 llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
48 cl::ParseCommandLineOptions(argc, argv, " llvm .bc -> .ll disassembler\n");
49 sys::PrintStackTraceOnErrorSignal();
51 std::ostream *Out = &std::cout; // Default to printing to stdout.
52 std::string ErrorMessage;
54 std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, &ErrorMessage));
56 cerr << argv[0] << ": ";
57 if (ErrorMessage.size())
58 cerr << ErrorMessage << "\n";
60 cerr << "bytecode didn't read correctly.\n";
65 // Just use stdout. We won't actually print anything on it.
66 } else if (OutputFilename != "") { // Specified an output filename?
67 if (OutputFilename != "-") { // Not stdout?
68 if (!Force && std::ifstream(OutputFilename.c_str())) {
69 // If force is not specified, make sure not to overwrite a file!
70 cerr << argv[0] << ": error opening '" << OutputFilename
71 << "': file exists! Sending to standard output.\n";
73 Out = new std::ofstream(OutputFilename.c_str());
77 if (InputFilename == "-") {
80 std::string IFN = InputFilename;
81 int Len = IFN.length();
82 if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
84 OutputFilename = std::string(IFN.begin(), IFN.end()-3)+".ll";
86 OutputFilename = IFN+".ll";
89 if (!Force && std::ifstream(OutputFilename.c_str())) {
90 // If force is not specified, make sure not to overwrite a file!
91 cerr << argv[0] << ": error opening '" << OutputFilename
92 << "': file exists! Sending to standard output.\n";
94 Out = new std::ofstream(OutputFilename.c_str());
96 // Make sure that the Out file gets unlinked from the disk if we get a
98 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
104 cerr << argv[0] << ": error opening " << OutputFilename
105 << ": sending to stdout instead!\n";
109 // All that llvm-dis does is write the assembly to a file.
113 Passes.add(new PrintModulePass(&L));
114 Passes.run(*M.get());
117 if (Out != &std::cout) {
118 ((std::ofstream*)Out)->close();
122 } catch (const std::string& msg) {
123 cerr << argv[0] << ": " << msg << "\n";
125 cerr << argv[0] << ": Unexpected unknown exception occurred.\n";