1 //===------------------------------------------------------------------------=== 2 // LLVM 'AS' UTILITY 3 // 4 // This utility may be invoked in the following manner: 5 // as --help - Output information about command line switches 6 // as [options] - Read LLVM assembly from stdin, write bytecode to stdout 7 // as [options] x.ll - Read LLVM assembly from the x.ll file, write bytecode 8 // to the x.bc file. 9 // 10 //===------------------------------------------------------------------------=== 11 12 #include "llvm/Module.h" 13 #include "llvm/Assembly/Parser.h" 14 #include "llvm/Bytecode/Writer.h" 15 #include "Support/CommandLine.h" 16 #include <fstream> 17 #include <string> 18 #include <memory> 19 20 cl::String InputFilename ("", "Parse <arg> file, compile to bytecode", 0, "-"); 21 cl::String OutputFilename("o", "Override output filename", cl::NoFlags, ""); 22 cl::Flag Force ("f", "Overwrite output files", cl::NoFlags, false); 23 cl::Flag DumpAsm ("d", "Print assembly as parsed", cl::Hidden, false); 24 25 int main(int argc, char **argv) { 26 cl::ParseCommandLineOptions(argc, argv, " llvm .ll -> .bc assembler\n"); 27 28 ostream *Out = 0; 29 try { 30 // Parse the file now... 31 std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename)); 32 if (M.get() == 0) { 33 cerr << "assembly didn't read correctly.\n"; 34 return 1; 35 } 36 37 if (DumpAsm) { 38 cerr << "Here's the assembly:\n"; 39 M.get()->dump(); 40 } 41 42 if (OutputFilename != "") { // Specified an output filename? 43 if (!Force && std::ifstream(OutputFilename.c_str())) { 44 // If force is not specified, make sure not to overwrite a file! 45 cerr << "Error opening '" << OutputFilename << "': File exists!\n" 46 << "Use -f command line argument to force output\n"; 47 return 1; 48 } 49 Out = new std::ofstream(OutputFilename.c_str()); 50 } else { 51 if (InputFilename == "-") { 52 OutputFilename = "-"; 53 Out = &cout; 54 } else { 55 std::string IFN = InputFilename; 56 int Len = IFN.length(); 57 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') { 58 // Source ends in .ll 59 OutputFilename = std::string(IFN.begin(), IFN.end()-3); 60 } else { 61 OutputFilename = IFN; // Append a .bc to it 62 } 63 OutputFilename += ".bc"; 64 65 if (!Force && std::ifstream(OutputFilename.c_str())) { 66 // If force is not specified, make sure not to overwrite a file! 67 cerr << "Error opening '" << OutputFilename << "': File exists!\n" 68 << "Use -f command line argument to force output\n"; 69 return 1; 70 } 71 72 Out = new std::ofstream(OutputFilename.c_str()); 73 } 74 } 75 76 if (!Out->good()) { 77 cerr << "Error opening " << OutputFilename << "!\n"; 78 return 1; 79 } 80 81 WriteBytecodeToFile(M.get(), *Out); 82 } catch (const ParseException &E) { 83 cerr << E.getMessage() << endl; 84 return 1; 85 } 86 87 if (Out != &cout) delete Out; 88 return 0; 89 } 90 91