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 using std::string; 21 22 static cl::opt<string> 23 InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-")); 24 25 static cl::opt<string> 26 OutputFilename("o", cl::desc("Override output filename"), 27 cl::value_desc("filename")); 28 29 static cl::opt<bool> 30 Force("f", cl::desc("Overwrite output files")); 31 32 static cl::opt<bool> 33 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden); 34 35 int main(int argc, char **argv) { 36 cl::ParseCommandLineOptions(argc, argv, " llvm .ll -> .bc assembler\n"); 37 38 std::ostream *Out = 0; 39 try { 40 // Parse the file now... 41 std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename)); 42 if (M.get() == 0) { 43 cerr << argv[0] << ": assembly didn't read correctly.\n"; 44 return 1; 45 } 46 47 if (DumpAsm) cerr << "Here's the assembly:\n" << M.get(); 48 49 if (OutputFilename != "") { // Specified an output filename? 50 if (!Force && std::ifstream(OutputFilename.c_str())) { 51 // If force is not specified, make sure not to overwrite a file! 52 cerr << argv[0] << ": error opening '" << OutputFilename 53 << "': file exists!\n" 54 << "Use -f command line argument to force output\n"; 55 return 1; 56 } 57 Out = new std::ofstream(OutputFilename.c_str()); 58 } else { 59 if (InputFilename == "-") { 60 OutputFilename = "-"; 61 Out = &std::cout; 62 } else { 63 std::string IFN = InputFilename; 64 int Len = IFN.length(); 65 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') { 66 // Source ends in .ll 67 OutputFilename = std::string(IFN.begin(), IFN.end()-3); 68 } else { 69 OutputFilename = IFN; // Append a .bc to it 70 } 71 OutputFilename += ".bc"; 72 73 if (!Force && std::ifstream(OutputFilename.c_str())) { 74 // If force is not specified, make sure not to overwrite a file! 75 cerr << argv[0] << ": error opening '" << OutputFilename 76 << "': file exists!\n" 77 << "Use -f command line argument to force output\n"; 78 return 1; 79 } 80 81 Out = new std::ofstream(OutputFilename.c_str()); 82 // Make sure that the Out file gets unlink'd from the disk if we get a 83 // SIGINT 84 RemoveFileOnSignal(OutputFilename); 85 } 86 } 87 88 if (!Out->good()) { 89 cerr << argv[0] << ": error opening " << OutputFilename << "!\n"; 90 return 1; 91 } 92 93 WriteBytecodeToFile(M.get(), *Out); 94 } catch (const ParseException &E) { 95 cerr << argv[0] << ": " << E.getMessage() << "\n"; 96 return 1; 97 } 98 99 if (Out != &std::cout) delete Out; 100 return 0; 101 } 102 103