1 //===--- llvm-as.cpp - The low-level LLVM assembler -----------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // 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 bitcode to stdout 13 // llvm-as [options] x.ll - Read LLVM asm from the x.ll file, write bitcode 14 // to the x.bc file. 15 // 16 //===----------------------------------------------------------------------===// 17 18 #include "llvm/Module.h" 19 #include "llvm/Assembly/Parser.h" 20 #include "llvm/Analysis/Verifier.h" 21 #include "llvm/Bitcode/ReaderWriter.h" 22 #include "llvm/Support/CommandLine.h" 23 #include "llvm/Support/ManagedStatic.h" 24 #include "llvm/Support/Streams.h" 25 #include "llvm/Support/SystemUtils.h" 26 #include "llvm/System/Signals.h" 27 #include <fstream> 28 #include <iostream> 29 #include <memory> 30 using namespace llvm; 31 32 static cl::opt<std::string> 33 InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-")); 34 35 static cl::opt<std::string> 36 OutputFilename("o", cl::desc("Override output filename"), 37 cl::value_desc("filename")); 38 39 static cl::opt<bool> 40 Force("f", cl::desc("Overwrite output files")); 41 42 static cl::opt<bool> 43 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden); 44 45 static cl::opt<bool> 46 DisableVerify("disable-verify", cl::Hidden, 47 cl::desc("Do not run verifier on input LLVM (dangerous!)")); 48 49 int main(int argc, char **argv) { 50 llvm_shutdown_obj X; // Call llvm_shutdown() on exit. 51 cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n"); 52 sys::PrintStackTraceOnErrorSignal(); 53 54 int exitCode = 0; 55 std::ostream *Out = 0; 56 try { 57 // Parse the file now... 58 ParseError Err; 59 std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename,&Err)); 60 if (M.get() == 0) { 61 cerr << argv[0] << ": " << Err.getMessage() << "\n"; 62 return 1; 63 } 64 65 if (!DisableVerify) { 66 std::string Err; 67 if (verifyModule(*M.get(), ReturnStatusAction, &Err)) { 68 cerr << argv[0] 69 << ": assembly parsed, but does not verify as correct!\n"; 70 cerr << Err; 71 return 1; 72 } 73 } 74 75 if (DumpAsm) cerr << "Here's the assembly:\n" << *M.get(); 76 77 if (OutputFilename != "") { // Specified an output filename? 78 if (OutputFilename != "-") { // Not stdout? 79 if (!Force && std::ifstream(OutputFilename.c_str())) { 80 // If force is not specified, make sure not to overwrite a file! 81 cerr << argv[0] << ": error opening '" << OutputFilename 82 << "': file exists!\n" 83 << "Use -f command line argument to force output\n"; 84 return 1; 85 } 86 Out = new std::ofstream(OutputFilename.c_str(), std::ios::out | 87 std::ios::trunc | std::ios::binary); 88 } else { // Specified stdout 89 // FIXME: cout is not binary! 90 Out = &std::cout; 91 } 92 } else { 93 if (InputFilename == "-") { 94 OutputFilename = "-"; 95 Out = &std::cout; 96 } else { 97 std::string IFN = InputFilename; 98 int Len = IFN.length(); 99 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') { 100 // Source ends in .ll 101 OutputFilename = std::string(IFN.begin(), IFN.end()-3); 102 } else { 103 OutputFilename = IFN; // Append a .bc to it 104 } 105 OutputFilename += ".bc"; 106 107 if (!Force && std::ifstream(OutputFilename.c_str())) { 108 // If force is not specified, make sure not to overwrite a file! 109 cerr << argv[0] << ": error opening '" << OutputFilename 110 << "': file exists!\n" 111 << "Use -f command line argument to force output\n"; 112 return 1; 113 } 114 115 Out = new std::ofstream(OutputFilename.c_str(), std::ios::out | 116 std::ios::trunc | std::ios::binary); 117 // Make sure that the Out file gets unlinked from the disk if we get a 118 // SIGINT 119 sys::RemoveFileOnSignal(sys::Path(OutputFilename)); 120 } 121 } 122 123 if (!Out->good()) { 124 cerr << argv[0] << ": error opening " << OutputFilename << "!\n"; 125 return 1; 126 } 127 128 if (Force || !CheckBitcodeOutputToConsole(Out,true)) 129 WriteBitcodeToFile(M.get(), *Out); 130 } catch (const std::string& msg) { 131 cerr << argv[0] << ": " << msg << "\n"; 132 exitCode = 1; 133 } catch (...) { 134 cerr << argv[0] << ": Unexpected unknown exception occurred.\n"; 135 exitCode = 1; 136 } 137 138 if (Out != &std::cout) delete Out; 139 return exitCode; 140 } 141 142