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 "llvm/Support/CommandLine.h" 23 #include "llvm/System/Signals.h" 24 #include <fstream> 25 #include <iostream> 26 #include <memory> 27 28 using namespace llvm; 29 30 static cl::opt<std::string> 31 InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-")); 32 33 static cl::opt<std::string> 34 OutputFilename("o", cl::desc("Override output filename"), 35 cl::value_desc("filename")); 36 37 static cl::opt<bool> 38 Force("f", cl::desc("Overwrite output files")); 39 40 static cl::opt<bool> 41 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden); 42 43 static cl::opt<bool> 44 NoCompress("disable-compression", cl::init(false), 45 cl::desc("Don't ompress the generated bytecode")); 46 47 static cl::opt<bool> 48 DisableVerify("disable-verify", cl::Hidden, 49 cl::desc("Do not run verifier on input LLVM (dangerous!)")); 50 51 int main(int argc, char **argv) { 52 cl::ParseCommandLineOptions(argc, argv, " llvm .ll -> .bc assembler\n"); 53 sys::PrintStackTraceOnErrorSignal(); 54 55 std::ostream *Out = 0; 56 try { 57 // Parse the file now... 58 std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename)); 59 if (M.get() == 0) { 60 std::cerr << argv[0] << ": assembly didn't read correctly.\n"; 61 return 1; 62 } 63 64 try { 65 if (!DisableVerify) 66 verifyModule(*M.get(), ThrowExceptionAction); 67 } catch (const std::string &Err) { 68 std::cerr << argv[0] 69 << ": assembly parsed, but does not verify as correct!\n"; 70 std::cerr << Err; 71 return 1; 72 } 73 74 if (DumpAsm) std::cerr << "Here's the assembly:\n" << M.get(); 75 76 if (OutputFilename != "") { // Specified an output filename? 77 if (OutputFilename != "-") { // Not stdout? 78 if (!Force && std::ifstream(OutputFilename.c_str())) { 79 // If force is not specified, make sure not to overwrite a file! 80 std::cerr << argv[0] << ": error opening '" << OutputFilename 81 << "': file exists!\n" 82 << "Use -f command line argument to force output\n"; 83 return 1; 84 } 85 Out = new std::ofstream(OutputFilename.c_str(), std::ios_base::out | 86 std::ios_base::trunc | std::ios_base::binary); 87 } else { // Specified stdout 88 Out = &std::cout; 89 } 90 } else { 91 if (InputFilename == "-") { 92 OutputFilename = "-"; 93 Out = &std::cout; 94 } else { 95 std::string IFN = InputFilename; 96 int Len = IFN.length(); 97 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') { 98 // Source ends in .ll 99 OutputFilename = std::string(IFN.begin(), IFN.end()-3); 100 } else { 101 OutputFilename = IFN; // Append a .bc to it 102 } 103 OutputFilename += ".bc"; 104 105 if (!Force && std::ifstream(OutputFilename.c_str())) { 106 // If force is not specified, make sure not to overwrite a file! 107 std::cerr << argv[0] << ": error opening '" << OutputFilename 108 << "': file exists!\n" 109 << "Use -f command line argument to force output\n"; 110 return 1; 111 } 112 113 Out = new std::ofstream(OutputFilename.c_str(), std::ios_base::out | 114 std::ios_base::trunc | std::ios_base::binary); 115 // Make sure that the Out file gets unlinked from the disk if we get a 116 // SIGINT 117 sys::RemoveFileOnSignal(sys::Path(OutputFilename)); 118 } 119 } 120 121 if (!Out->good()) { 122 std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n"; 123 return 1; 124 } 125 126 WriteBytecodeToFile(M.get(), *Out, !NoCompress); 127 } catch (const ParseException &E) { 128 std::cerr << argv[0] << ": " << E.getMessage() << "\n"; 129 return 1; 130 } 131 132 if (Out != &std::cout) delete Out; 133 return 0; 134 } 135 136