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