1 //===----------------------------------------------------------------------===//
4 // This utility may be invoked in the following manner:
5 // llvm-dis [options] - Read LLVM bytecode from stdin, write asm to stdout
6 // llvm-dis [options] x.bc - Read LLVM bytecode from the x.bc file, write asm
9 // --help - Output information about command line switches
10 // -c - Print C code instead of LLVM assembly
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Module.h"
15 #include "llvm/PassManager.h"
16 #include "llvm/Bytecode/Reader.h"
17 #include "llvm/Assembly/CWriter.h"
18 #include "llvm/Assembly/PrintModulePass.h"
19 #include "Support/CommandLine.h"
20 #include "Support/Signals.h"
24 // OutputMode - The different orderings to print basic blocks in...
26 llvm = 0, // Generate LLVM assembly (the default)
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"));
40 static cl::opt<enum OutputMode>
41 WriteMode(cl::desc("Specify the output format:"),
42 cl::values(clEnumVal(llvm, "Output LLVM assembly"),
43 clEnumVal(c , "Output C code for program"),
46 int main(int argc, char **argv) {
47 cl::ParseCommandLineOptions(argc, argv, " llvm .bc -> .ll disassembler\n");
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 std::cerr << argv[0] << ": ";
54 if (ErrorMessage.size())
55 std::cerr << ErrorMessage << "\n";
57 std::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 std::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);
81 OutputFilename = IFN; // Append a .ll to it
84 OutputFilename += ".c";
86 OutputFilename += ".ll";
88 if (!Force && std::ifstream(OutputFilename.c_str())) {
89 // If force is not specified, make sure not to overwrite a file!
90 std::cerr << argv[0] << ": error opening '" << OutputFilename
91 << "': file exists! Sending to standard output.\n";
93 Out = new std::ofstream(OutputFilename.c_str());
95 // Make sure that the Out file gets unlink'd from the disk if we get a
97 RemoveFileOnSignal(OutputFilename);
103 std::cerr << argv[0] << ": error opening " << OutputFilename
104 << ": sending to stdout instead!\n";
108 // All that dis does is write the assembly or C out to a file...
113 case llvm: // Output LLVM assembly
114 Passes.add(new PrintModulePass(Out));
116 case c: // Convert LLVM to C
117 Passes.add(createWriteToCPass(*Out));
121 Passes.run(*M.get());
123 if (Out != &std::cout) {
124 ((std::ofstream*)Out)->close();