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/System/Signals.h"
30 static cl::opt<std::string>
31 InputFilename(cl::Positional, cl::desc("<input bytecode>"), 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("Overwrite output files"));
41 CWriteMode("c", cl::desc("Obsolete option, do not use"), cl::ReallyHidden);
43 int main(int argc, char **argv) {
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;
52 std::cerr << "ERROR: llvm-dis no longer contains the C backend. "
53 << "Use 'llc -march=c' instead!\n";
57 std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, &ErrorMessage));
59 std::cerr << argv[0] << ": ";
60 if (ErrorMessage.size())
61 std::cerr << ErrorMessage << "\n";
63 std::cerr << "bytecode didn't read correctly.\n";
67 if (OutputFilename != "") { // Specified an output filename?
68 if (OutputFilename != "-") { // Not stdout?
69 if (!Force && std::ifstream(OutputFilename.c_str())) {
70 // If force is not specified, make sure not to overwrite a file!
71 std::cerr << argv[0] << ": error opening '" << OutputFilename
72 << "': file exists! Sending to standard output.\n";
74 Out = new std::ofstream(OutputFilename.c_str());
78 if (InputFilename == "-") {
81 std::string IFN = InputFilename;
82 int Len = IFN.length();
83 if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
85 OutputFilename = std::string(IFN.begin(), IFN.end()-3)+".ll";
87 OutputFilename = IFN+".ll";
90 if (!Force && std::ifstream(OutputFilename.c_str())) {
91 // If force is not specified, make sure not to overwrite a file!
92 std::cerr << argv[0] << ": error opening '" << OutputFilename
93 << "': file exists! Sending to standard output.\n";
95 Out = new std::ofstream(OutputFilename.c_str());
97 // Make sure that the Out file gets unlinked from the disk if we get a
99 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
105 std::cerr << argv[0] << ": error opening " << OutputFilename
106 << ": sending to stdout instead!\n";
110 // All that dis does is write the assembly or C out to a file...
113 Passes.add(new PrintModulePass(Out));
114 Passes.run(*M.get());
116 if (Out != &std::cout) {
117 ((std::ofstream*)Out)->close();
121 } catch (const std::string& msg) {
122 std::cerr << argv[0] << ": " << msg << "\n";
124 std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";