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 "Support/Signals.h" 17 #include <fstream> 18 #include <memory> 19 using std::cerr; 20 21 cl::String InputFilename ("", "Parse <arg> file, compile to bytecode", 0, "-"); 22 cl::String OutputFilename("o", "Override output filename", cl::NoFlags, ""); 23 cl::Flag Force ("f", "Overwrite output files", cl::NoFlags, false); 24 cl::Flag DumpAsm ("d", "Print assembly as parsed", cl::Hidden, false); 25 26 int main(int argc, char **argv) { 27 cl::ParseCommandLineOptions(argc, argv, " llvm .ll -> .bc assembler\n"); 28 29 std::ostream *Out = 0; 30 try { 31 // Parse the file now... 32 std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename)); 33 if (M.get() == 0) { 34 cerr << "assembly didn't read correctly.\n"; 35 return 1; 36 } 37 38 if (DumpAsm) cerr << "Here's the assembly:\n" << M.get(); 39 40 if (OutputFilename != "") { // Specified an output filename? 41 if (!Force && std::ifstream(OutputFilename.c_str())) { 42 // If force is not specified, make sure not to overwrite a file! 43 cerr << "Error opening '" << OutputFilename << "': File exists!\n" 44 << "Use -f command line argument to force output\n"; 45 return 1; 46 } 47 Out = new std::ofstream(OutputFilename.c_str()); 48 } else { 49 if (InputFilename == "-") { 50 OutputFilename = "-"; 51 Out = &std::cout; 52 } else { 53 std::string IFN = InputFilename; 54 int Len = IFN.length(); 55 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') { 56 // Source ends in .ll 57 OutputFilename = std::string(IFN.begin(), IFN.end()-3); 58 } else { 59 OutputFilename = IFN; // Append a .bc to it 60 } 61 OutputFilename += ".bc"; 62 63 if (!Force && std::ifstream(OutputFilename.c_str())) { 64 // If force is not specified, make sure not to overwrite a file! 65 cerr << "Error opening '" << OutputFilename << "': File exists!\n" 66 << "Use -f command line argument to force output\n"; 67 return 1; 68 } 69 70 Out = new std::ofstream(OutputFilename.c_str()); 71 // Make sure that the Out file gets unlink'd from the disk if we get a 72 // SIGINT 73 RemoveFileOnSignal(OutputFilename); 74 } 75 } 76 77 if (!Out->good()) { 78 cerr << "Error opening " << OutputFilename << "!\n"; 79 return 1; 80 } 81 82 WriteBytecodeToFile(M.get(), *Out); 83 } catch (const ParseException &E) { 84 cerr << E.getMessage() << std::endl; 85 return 1; 86 } 87 88 if (Out != &std::cout) delete Out; 89 return 0; 90 } 91 92