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/LLVMContext.h"
20 #include "llvm/Module.h"
21 #include "llvm/Bitcode/ReaderWriter.h"
22 #include "llvm/Support/CommandLine.h"
23 #include "llvm/Support/ManagedStatic.h"
24 #include "llvm/Support/MemoryBuffer.h"
25 #include "llvm/Support/PrettyStackTrace.h"
26 #include "llvm/Support/raw_ostream.h"
27 #include "llvm/System/Signals.h"
30 static cl::opt<std::string>
31 InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
33 static cl::opt<std::string>
34 OutputFilename("o", cl::desc("Override output filename"),
35 cl::value_desc("filename"));
38 Force("f", cl::desc("Enable binary output on terminals"));
41 DontPrint("disable-output", cl::desc("Don't output the .ll file"), cl::Hidden);
43 int main(int argc, char **argv) {
44 // Print a stack trace if we signal out.
45 sys::PrintStackTraceOnErrorSignal();
46 PrettyStackTraceProgram X(argc, argv);
48 LLVMContext &Context = getGlobalContext();
49 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
52 cl::ParseCommandLineOptions(argc, argv, "llvm .bc -> .ll disassembler\n");
54 std::string ErrorMessage;
55 std::auto_ptr<Module> M;
57 if (MemoryBuffer *Buffer
58 = MemoryBuffer::getFileOrSTDIN(InputFilename, &ErrorMessage)) {
59 M.reset(ParseBitcodeFile(Buffer, Context, &ErrorMessage));
64 errs() << argv[0] << ": ";
65 if (ErrorMessage.size())
66 errs() << ErrorMessage << "\n";
68 errs() << "bitcode didn't read correctly.\n";
72 // Just use stdout. We won't actually print anything on it.
76 if (OutputFilename.empty()) { // Unspecified output, infer it.
77 if (InputFilename == "-") {
80 const std::string &IFN = InputFilename;
81 int Len = IFN.length();
82 // If the source ends in .bc, strip it off.
83 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";
90 std::string ErrorInfo;
91 OwningPtr<tool_output_file>
92 Out(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
93 raw_fd_ostream::F_Binary));
94 if (!ErrorInfo.empty()) {
95 errs() << ErrorInfo << '\n';
99 // All that llvm-dis does is write the assembly to a file.