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/LLVMContext.h" 19 #include "llvm/Module.h" 20 #include "llvm/Assembly/Parser.h" 21 #include "llvm/Analysis/Verifier.h" 22 #include "llvm/Bitcode/ReaderWriter.h" 23 #include "llvm/Support/CommandLine.h" 24 #include "llvm/Support/ManagedStatic.h" 25 #include "llvm/Support/PrettyStackTrace.h" 26 #include "llvm/Support/Streams.h" 27 #include "llvm/Support/SystemUtils.h" 28 #include "llvm/Support/raw_ostream.h" 29 #include "llvm/System/Signals.h" 30 #include <fstream> 31 #include <iostream> 32 #include <memory> 33 using namespace llvm; 34 35 static cl::opt<std::string> 36 InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-")); 37 38 static cl::opt<std::string> 39 OutputFilename("o", cl::desc("Override output filename"), 40 cl::value_desc("filename")); 41 42 static cl::opt<bool> 43 Force("f", cl::desc("Overwrite output files")); 44 45 static cl::opt<bool> 46 DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false)); 47 48 static cl::opt<bool> 49 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden); 50 51 static cl::opt<bool> 52 DisableVerify("disable-verify", cl::Hidden, 53 cl::desc("Do not run verifier on input LLVM (dangerous!)")); 54 55 int main(int argc, char **argv) { 56 // Print a stack trace if we signal out. 57 sys::PrintStackTraceOnErrorSignal(); 58 PrettyStackTraceProgram X(argc, argv); 59 LLVMContext Context; 60 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 61 cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n"); 62 63 int exitCode = 0; 64 std::ostream *Out = 0; 65 try { 66 // Parse the file now... 67 ParseError Err; 68 std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename, Err, &Context)); 69 if (M.get() == 0) { 70 Err.PrintError(argv[0], errs()); 71 return 1; 72 } 73 74 if (!DisableVerify) { 75 std::string Err; 76 if (verifyModule(*M.get(), ReturnStatusAction, &Err)) { 77 cerr << argv[0] 78 << ": assembly parsed, but does not verify as correct!\n"; 79 cerr << Err; 80 return 1; 81 } 82 } 83 84 if (DumpAsm) cerr << "Here's the assembly:\n" << *M.get(); 85 86 if (OutputFilename != "") { // Specified an output filename? 87 if (OutputFilename != "-") { // Not stdout? 88 if (!Force && std::ifstream(OutputFilename.c_str())) { 89 // If force is not specified, make sure not to overwrite a file! 90 cerr << argv[0] << ": error opening '" << OutputFilename 91 << "': file exists!\n" 92 << "Use -f command line argument to force output\n"; 93 return 1; 94 } 95 Out = new std::ofstream(OutputFilename.c_str(), std::ios::out | 96 std::ios::trunc | std::ios::binary); 97 } else { // Specified stdout 98 // FIXME: cout is not binary! 99 Out = &std::cout; 100 } 101 } else { 102 if (InputFilename == "-") { 103 OutputFilename = "-"; 104 Out = &std::cout; 105 } else { 106 std::string IFN = InputFilename; 107 int Len = IFN.length(); 108 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') { 109 // Source ends in .ll 110 OutputFilename = std::string(IFN.begin(), IFN.end()-3); 111 } else { 112 OutputFilename = IFN; // Append a .bc to it 113 } 114 OutputFilename += ".bc"; 115 116 if (!Force && std::ifstream(OutputFilename.c_str())) { 117 // If force is not specified, make sure not to overwrite a file! 118 cerr << argv[0] << ": error opening '" << OutputFilename 119 << "': file exists!\n" 120 << "Use -f command line argument to force output\n"; 121 return 1; 122 } 123 124 Out = new std::ofstream(OutputFilename.c_str(), std::ios::out | 125 std::ios::trunc | std::ios::binary); 126 // Make sure that the Out file gets unlinked from the disk if we get a 127 // SIGINT 128 sys::RemoveFileOnSignal(sys::Path(OutputFilename)); 129 } 130 } 131 132 if (!Out->good()) { 133 cerr << argv[0] << ": error opening " << OutputFilename << "!\n"; 134 return 1; 135 } 136 137 if (!DisableOutput) 138 if (Force || !CheckBitcodeOutputToConsole(Out,true)) 139 WriteBitcodeToFile(M.get(), *Out); 140 } catch (const std::string& msg) { 141 cerr << argv[0] << ": " << msg << "\n"; 142 exitCode = 1; 143 } catch (...) { 144 cerr << argv[0] << ": Unexpected unknown exception occurred.\n"; 145 exitCode = 1; 146 } 147 148 if (Out != &std::cout) delete Out; 149 return exitCode; 150 } 151 152