1 //===-- llvm-dis.cpp - The low-level LLVM disassembler --------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This utility may be invoked in the following manner:
11 // llvm-dis [options] - Read LLVM bitcode from stdin, write asm to stdout
12 // llvm-dis [options] x.bc - Read LLVM bitcode 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/Bitcode/ReaderWriter.h"
22 #include "llvm/Assembly/PrintModulePass.h"
23 #include "llvm/Support/CommandLine.h"
24 #include "llvm/Support/ManagedStatic.h"
25 #include "llvm/Support/MemoryBuffer.h"
26 #include "llvm/Support/Streams.h"
27 #include "llvm/Support/raw_ostream.h"
28 #include "llvm/System/Signals.h"
34 static cl::opt<std::string>
35 InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
37 static cl::opt<std::string>
38 OutputFilename("o", cl::desc("Override output filename"),
39 cl::value_desc("filename"));
42 Force("f", cl::desc("Overwrite output files"));
45 DontPrint("disable-output", cl::desc("Don't output the .ll file"), cl::Hidden);
47 int main(int argc, char **argv) {
48 llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
50 cl::ParseCommandLineOptions(argc, argv, "llvm .bc -> .ll disassembler\n");
51 sys::PrintStackTraceOnErrorSignal();
53 std::ostream *Out = &std::cout; // Default to printing to stdout.
54 std::string ErrorMessage;
56 std::auto_ptr<Module> M;
58 if (MemoryBuffer *Buffer
59 = MemoryBuffer::getFileOrSTDIN(InputFilename, &ErrorMessage)) {
60 M.reset(ParseBitcodeFile(Buffer, &ErrorMessage));
65 cerr << argv[0] << ": ";
66 if (ErrorMessage.size())
67 cerr << ErrorMessage << "\n";
69 cerr << "bitcode didn't read correctly.\n";
74 // Just use stdout. We won't actually print anything on it.
75 } else if (OutputFilename != "") { // Specified an output filename?
76 if (OutputFilename != "-") { // Not stdout?
77 if (!Force && std::ifstream(OutputFilename.c_str())) {
78 // If force is not specified, make sure not to overwrite a file!
79 cerr << argv[0] << ": error opening '" << OutputFilename
80 << "': file exists! Sending to standard output.\n";
82 Out = new std::ofstream(OutputFilename.c_str());
86 if (InputFilename == "-") {
89 std::string IFN = InputFilename;
90 int Len = IFN.length();
91 if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
93 OutputFilename = std::string(IFN.begin(), IFN.end()-3)+".ll";
95 OutputFilename = IFN+".ll";
98 if (!Force && std::ifstream(OutputFilename.c_str())) {
99 // If force is not specified, make sure not to overwrite a file!
100 cerr << argv[0] << ": error opening '" << OutputFilename
101 << "': file exists! Sending to standard output.\n";
103 Out = new std::ofstream(OutputFilename.c_str());
105 // Make sure that the Out file gets unlinked from the disk if we get a
107 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
113 cerr << argv[0] << ": error opening " << OutputFilename
114 << ": sending to stdout instead!\n";
118 // All that llvm-dis does is write the assembly to a file.
121 raw_os_ostream L(*Out);
122 Passes.add(createPrintModulePass(&L));
123 Passes.run(*M.get());
126 if (Out != &std::cout) {
127 ((std::ofstream*)Out)->close();
131 } catch (const std::string& msg) {
132 cerr << argv[0] << ": " << msg << "\n";
134 cerr << argv[0] << ": Unexpected unknown exception occurred.\n";