1 //===--- llvm-as.cpp - The low-level LLVM assembler -----------------------===// 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 // This utility may be invoked in the following manner: 11 // llvm-as --help - Output information about command line switches 12 // llvm-as [options] - Read LLVM asm from stdin, write bytecode to stdout 13 // llvm-as [options] x.ll - Read LLVM asm from the x.ll file, write bytecode 14 // to the x.bc file. 15 // 16 //===------------------------------------------------------------------------=== 17 18 #include "llvm/Module.h" 19 #include "llvm/Assembly/Parser.h" 20 #include "llvm/Bytecode/Writer.h" 21 #include "llvm/Analysis/Verifier.h" 22 #include "Support/CommandLine.h" 23 #include "llvm/System/Signals.h" 24 #include <fstream> 25 #include <memory> 26 27 using namespace llvm; 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 PrintStackTraceOnErrorSignal(); 49 50 std::ostream *Out = 0; 51 try { 52 // Parse the file now... 53 std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename)); 54 if (M.get() == 0) { 55 std::cerr << argv[0] << ": assembly didn't read correctly.\n"; 56 return 1; 57 } 58 59 if (!DisableVerify && verifyModule(*M.get())) { 60 std::cerr << argv[0] 61 << ": assembly parsed, but does not verify as correct!\n"; 62 return 1; 63 } 64 65 if (DumpAsm) std::cerr << "Here's the assembly:\n" << M.get(); 66 67 if (OutputFilename != "") { // Specified an output filename? 68 if (OutputFilename != "-") { // Not stdout? 69 if (!Force && std::ifstream(OutputFilename.c_str())) { 70 // If force is not specified, make sure not to overwrite a file! 71 std::cerr << argv[0] << ": error opening '" << OutputFilename 72 << "': file exists!\n" 73 << "Use -f command line argument to force output\n"; 74 return 1; 75 } 76 Out = new std::ofstream(OutputFilename.c_str(), std::ios_base::out | 77 std::ios_base::trunc | std::ios_base::binary); 78 } else { // Specified stdout 79 Out = &std::cout; 80 } 81 } else { 82 if (InputFilename == "-") { 83 OutputFilename = "-"; 84 Out = &std::cout; 85 } else { 86 std::string IFN = InputFilename; 87 int Len = IFN.length(); 88 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') { 89 // Source ends in .ll 90 OutputFilename = std::string(IFN.begin(), IFN.end()-3); 91 } else { 92 OutputFilename = IFN; // Append a .bc to it 93 } 94 OutputFilename += ".bc"; 95 96 if (!Force && std::ifstream(OutputFilename.c_str())) { 97 // If force is not specified, make sure not to overwrite a file! 98 std::cerr << argv[0] << ": error opening '" << OutputFilename 99 << "': file exists!\n" 100 << "Use -f command line argument to force output\n"; 101 return 1; 102 } 103 104 Out = new std::ofstream(OutputFilename.c_str(), std::ios_base::out | 105 std::ios_base::trunc | std::ios_base::binary); 106 // Make sure that the Out file gets unlinked from the disk if we get a 107 // SIGINT 108 RemoveFileOnSignal(OutputFilename); 109 } 110 } 111 112 if (!Out->good()) { 113 std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n"; 114 return 1; 115 } 116 117 WriteBytecodeToFile(M.get(), *Out); 118 } catch (const ParseException &E) { 119 std::cerr << argv[0] << ": " << E.getMessage() << "\n"; 120 return 1; 121 } 122 123 if (Out != &std::cout) delete Out; 124 return 0; 125 } 126 127