1 //===------------------------------------------------------------------------=== 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file was developed by the LLVM research group and is distributed under 6 // the University of Illinois Open Source License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // LLVM 'AS' UTILITY 11 // 12 // This utility may be invoked in the following manner: 13 // llvm-as --help - Output information about command line switches 14 // llvm-as [options] - Read LLVM asm from stdin, write bytecode to stdout 15 // llvm-as [options] x.ll - Read LLVM asm from the x.ll file, write bytecode 16 // to the x.bc file. 17 // 18 //===------------------------------------------------------------------------=== 19 20 #include "llvm/Module.h" 21 #include "llvm/Assembly/Parser.h" 22 #include "llvm/Bytecode/Writer.h" 23 #include "llvm/Analysis/Verifier.h" 24 #include "Support/CommandLine.h" 25 #include "Support/Signals.h" 26 #include <fstream> 27 #include <memory> 28 29 static cl::opt<std::string> 30 InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-")); 31 32 static cl::opt<std::string> 33 OutputFilename("o", cl::desc("Override output filename"), 34 cl::value_desc("filename")); 35 36 static cl::opt<bool> 37 Force("f", cl::desc("Overwrite output files")); 38 39 static cl::opt<bool> 40 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden); 41 42 static cl::opt<bool> 43 DisableVerify("disable-verify", cl::Hidden, 44 cl::desc("Do not run verifier on input LLVM (dangerous!")); 45 46 int main(int argc, char **argv) { 47 cl::ParseCommandLineOptions(argc, argv, " llvm .ll -> .bc assembler\n"); 48 49 std::ostream *Out = 0; 50 try { 51 // Parse the file now... 52 std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename)); 53 if (M.get() == 0) { 54 std::cerr << argv[0] << ": assembly didn't read correctly.\n"; 55 return 1; 56 } 57 58 if (!DisableVerify && verifyModule(*M.get())) { 59 std::cerr << argv[0] 60 << ": assembly parsed, but does not verify as correct!\n"; 61 return 1; 62 } 63 64 if (DumpAsm) std::cerr << "Here's the assembly:\n" << M.get(); 65 66 if (OutputFilename != "") { // Specified an output filename? 67 if (OutputFilename != "-") { // Not stdout? 68 if (!Force && std::ifstream(OutputFilename.c_str())) { 69 // If force is not specified, make sure not to overwrite a file! 70 std::cerr << argv[0] << ": error opening '" << OutputFilename 71 << "': file exists!\n" 72 << "Use -f command line argument to force output\n"; 73 return 1; 74 } 75 Out = new std::ofstream(OutputFilename.c_str()); 76 } else { // Specified stdout 77 Out = &std::cout; 78 } 79 } else { 80 if (InputFilename == "-") { 81 OutputFilename = "-"; 82 Out = &std::cout; 83 } else { 84 std::string IFN = InputFilename; 85 int Len = IFN.length(); 86 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') { 87 // Source ends in .ll 88 OutputFilename = std::string(IFN.begin(), IFN.end()-3); 89 } else { 90 OutputFilename = IFN; // Append a .bc to it 91 } 92 OutputFilename += ".bc"; 93 94 if (!Force && std::ifstream(OutputFilename.c_str())) { 95 // If force is not specified, make sure not to overwrite a file! 96 std::cerr << argv[0] << ": error opening '" << OutputFilename 97 << "': file exists!\n" 98 << "Use -f command line argument to force output\n"; 99 return 1; 100 } 101 102 Out = new std::ofstream(OutputFilename.c_str()); 103 // Make sure that the Out file gets unlinked from the disk if we get a 104 // SIGINT 105 RemoveFileOnSignal(OutputFilename); 106 } 107 } 108 109 if (!Out->good()) { 110 std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n"; 111 return 1; 112 } 113 114 WriteBytecodeToFile(M.get(), *Out); 115 } catch (const ParseException &E) { 116 std::cerr << argv[0] << ": " << E.getMessage() << "\n"; 117 return 1; 118 } 119 120 if (Out != &std::cout) delete Out; 121 return 0; 122 } 123 124