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/Support/Streams.h" 24 #include "llvm/Support/SystemUtils.h" 25 #include "llvm/System/Signals.h" 26 #include <fstream> 27 #include <iostream> 28 #include <memory> 29 using namespace llvm; 30 31 static cl::opt<std::string> 32 InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-")); 33 34 static cl::opt<std::string> 35 OutputFilename("o", cl::desc("Override output filename"), 36 cl::value_desc("filename")); 37 38 static cl::opt<bool> 39 Force("f", cl::desc("Overwrite output files")); 40 41 static cl::opt<bool> 42 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden); 43 44 static cl::opt<bool> 45 NoCompress("disable-compression", cl::init(false), 46 cl::desc("Don't compress the generated bytecode")); 47 48 static cl::opt<bool> 49 DisableVerify("disable-verify", cl::Hidden, 50 cl::desc("Do not run verifier on input LLVM (dangerous!)")); 51 52 int main(int argc, char **argv) { 53 cl::ParseCommandLineOptions(argc, argv, " llvm .ll -> .bc assembler\n"); 54 sys::PrintStackTraceOnErrorSignal(); 55 56 int exitCode = 0; 57 std::ostream *Out = 0; 58 try { 59 // Parse the file now... 60 ParseError Err; 61 std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename,&Err)); 62 if (M.get() == 0) { 63 llvm_cerr << argv[0] << ": " << Err.getMessage() << "\n"; 64 return 1; 65 } 66 67 if (!DisableVerify) { 68 std::string Err; 69 if (verifyModule(*M.get(), ReturnStatusAction, &Err)) { 70 llvm_cerr << argv[0] 71 << ": assembly parsed, but does not verify as correct!\n"; 72 llvm_cerr << Err; 73 return 1; 74 } 75 } 76 77 if (DumpAsm) llvm_cerr << "Here's the assembly:\n" << *M.get(); 78 79 if (OutputFilename != "") { // Specified an output filename? 80 if (OutputFilename != "-") { // Not stdout? 81 if (!Force && std::ifstream(OutputFilename.c_str())) { 82 // If force is not specified, make sure not to overwrite a file! 83 llvm_cerr << argv[0] << ": error opening '" << OutputFilename 84 << "': file exists!\n" 85 << "Use -f command line argument to force output\n"; 86 return 1; 87 } 88 Out = new std::ofstream(OutputFilename.c_str(), std::ios::out | 89 std::ios::trunc | std::ios::binary); 90 } else { // Specified stdout 91 // FIXME: cout is not binary! 92 Out = &std::cout; 93 } 94 } else { 95 if (InputFilename == "-") { 96 OutputFilename = "-"; 97 Out = &std::cout; 98 } else { 99 std::string IFN = InputFilename; 100 int Len = IFN.length(); 101 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') { 102 // Source ends in .ll 103 OutputFilename = std::string(IFN.begin(), IFN.end()-3); 104 } else { 105 OutputFilename = IFN; // Append a .bc to it 106 } 107 OutputFilename += ".bc"; 108 109 if (!Force && std::ifstream(OutputFilename.c_str())) { 110 // If force is not specified, make sure not to overwrite a file! 111 llvm_cerr << argv[0] << ": error opening '" << OutputFilename 112 << "': file exists!\n" 113 << "Use -f command line argument to force output\n"; 114 return 1; 115 } 116 117 Out = new std::ofstream(OutputFilename.c_str(), std::ios::out | 118 std::ios::trunc | std::ios::binary); 119 // Make sure that the Out file gets unlinked from the disk if we get a 120 // SIGINT 121 sys::RemoveFileOnSignal(sys::Path(OutputFilename)); 122 } 123 } 124 125 if (!Out->good()) { 126 llvm_cerr << argv[0] << ": error opening " << OutputFilename << "!\n"; 127 return 1; 128 } 129 130 if (Force || !CheckBytecodeOutputToConsole(Out,true)) { 131 llvm_ostream L(*Out); 132 WriteBytecodeToFile(M.get(), L, !NoCompress); 133 } 134 } catch (const std::string& msg) { 135 llvm_cerr << argv[0] << ": " << msg << "\n"; 136 exitCode = 1; 137 } catch (...) { 138 llvm_cerr << argv[0] << ": Unexpected unknown exception occurred.\n"; 139 exitCode = 1; 140 } 141 142 if (Out != &std::cout) delete Out; 143 return exitCode; 144 } 145 146