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"));
42 int main(int argc, char **argv) {
43 llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
45 cl::ParseCommandLineOptions(argc, argv, " llvm .bc -> .ll disassembler\n");
46 sys::PrintStackTraceOnErrorSignal();
48 std::ostream *Out = &std::cout; // Default to printing to stdout.
49 std::string ErrorMessage;
51 std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, &ErrorMessage));
53 llvm_cerr << argv[0] << ": ";
54 if (ErrorMessage.size())
55 llvm_cerr << ErrorMessage << "\n";
57 llvm_cerr << "bytecode didn't read correctly.\n";
61 if (OutputFilename != "") { // Specified an output filename?
62 if (OutputFilename != "-") { // Not stdout?
63 if (!Force && std::ifstream(OutputFilename.c_str())) {
64 // If force is not specified, make sure not to overwrite a file!
65 llvm_cerr << argv[0] << ": error opening '" << OutputFilename
66 << "': file exists! Sending to standard output.\n";
68 Out = new std::ofstream(OutputFilename.c_str());
72 if (InputFilename == "-") {
75 std::string IFN = InputFilename;
76 int Len = IFN.length();
77 if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
79 OutputFilename = std::string(IFN.begin(), IFN.end()-3)+".ll";
81 OutputFilename = IFN+".ll";
84 if (!Force && std::ifstream(OutputFilename.c_str())) {
85 // If force is not specified, make sure not to overwrite a file!
86 llvm_cerr << argv[0] << ": error opening '" << OutputFilename
87 << "': file exists! Sending to standard output.\n";
89 Out = new std::ofstream(OutputFilename.c_str());
91 // Make sure that the Out file gets unlinked from the disk if we get a
93 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
99 llvm_cerr << argv[0] << ": error opening " << OutputFilename
100 << ": sending to stdout instead!\n";
104 // All that llvm-dis does is write the assembly to a file.
106 llvm_ostream L(*Out);
107 Passes.add(new PrintModulePass(&L));
108 Passes.run(*M.get());
110 if (Out != &std::cout) {
111 ((std::ofstream*)Out)->close();
115 } catch (const std::string& msg) {
116 llvm_cerr << argv[0] << ": " << msg << "\n";
118 llvm_cerr << argv[0] << ": Unexpected unknown exception occurred.\n";