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 #include <iostream> 20 using std::cerr; 21 22 cl::String InputFilename ("", "Parse <arg> file, compile to bytecode", 0, "-"); 23 cl::String OutputFilename("o", "Override output filename", cl::NoFlags, ""); 24 cl::Flag Force ("f", "Overwrite output files", cl::NoFlags, false); 25 cl::Flag DumpAsm ("d", "Print assembly as parsed", cl::Hidden, false); 26 27 int main(int argc, char **argv) { 28 cl::ParseCommandLineOptions(argc, argv, " llvm .ll -> .bc assembler\n"); 29 30 std::ostream *Out = 0; 31 try { 32 // Parse the file now... 33 std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename)); 34 if (M.get() == 0) { 35 cerr << "assembly didn't read correctly.\n"; 36 return 1; 37 } 38 39 if (DumpAsm) cerr << "Here's the assembly:\n" << M.get(); 40 41 if (OutputFilename != "") { // Specified an output filename? 42 if (!Force && std::ifstream(OutputFilename.c_str())) { 43 // If force is not specified, make sure not to overwrite a file! 44 cerr << "Error opening '" << OutputFilename << "': File exists!\n" 45 << "Use -f command line argument to force output\n"; 46 return 1; 47 } 48 Out = new std::ofstream(OutputFilename.c_str()); 49 } else { 50 if (InputFilename == "-") { 51 OutputFilename = "-"; 52 Out = &std::cout; 53 } else { 54 std::string IFN = InputFilename; 55 int Len = IFN.length(); 56 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') { 57 // Source ends in .ll 58 OutputFilename = std::string(IFN.begin(), IFN.end()-3); 59 } else { 60 OutputFilename = IFN; // Append a .bc to it 61 } 62 OutputFilename += ".bc"; 63 64 if (!Force && std::ifstream(OutputFilename.c_str())) { 65 // If force is not specified, make sure not to overwrite a file! 66 cerr << "Error opening '" << OutputFilename << "': File exists!\n" 67 << "Use -f command line argument to force output\n"; 68 return 1; 69 } 70 71 Out = new std::ofstream(OutputFilename.c_str()); 72 // Make sure that the Out file gets unlink'd from the disk if we get a 73 // SIGINT 74 RemoveFileOnSignal(OutputFilename); 75 } 76 } 77 78 if (!Out->good()) { 79 cerr << "Error opening " << OutputFilename << "!\n"; 80 return 1; 81 } 82 83 WriteBytecodeToFile(M.get(), *Out); 84 } catch (const ParseException &E) { 85 cerr << E.getMessage() << std::endl; 86 return 1; 87 } 88 89 if (Out != &std::cout) delete Out; 90 return 0; 91 } 92 93