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/SourceMgr.h" 27 #include "llvm/Support/SystemUtils.h" 28 #include "llvm/Support/raw_ostream.h" 29 #include "llvm/System/Signals.h" 30 #include <memory> 31 using namespace llvm; 32 33 static cl::opt<std::string> 34 InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-")); 35 36 static cl::opt<std::string> 37 OutputFilename("o", cl::desc("Override output filename"), 38 cl::value_desc("filename")); 39 40 static cl::opt<bool> 41 Force("f", cl::desc("Overwrite output files")); 42 43 static cl::opt<bool> 44 DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false)); 45 46 static cl::opt<bool> 47 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden); 48 49 static cl::opt<bool> 50 DisableVerify("disable-verify", cl::Hidden, 51 cl::desc("Do not run verifier on input LLVM (dangerous!)")); 52 53 int main(int argc, char **argv) { 54 // Print a stack trace if we signal out. 55 sys::PrintStackTraceOnErrorSignal(); 56 PrettyStackTraceProgram X(argc, argv); 57 LLVMContext &Context = getGlobalContext(); 58 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 59 cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n"); 60 61 // Parse the file now... 62 SMDiagnostic Err; 63 std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename, Err, Context)); 64 if (M.get() == 0) { 65 Err.Print(argv[0], errs()); 66 return 1; 67 } 68 69 if (!DisableVerify) { 70 std::string Err; 71 if (verifyModule(*M.get(), ReturnStatusAction, &Err)) { 72 errs() << argv[0] 73 << ": assembly parsed, but does not verify as correct!\n"; 74 errs() << Err; 75 return 1; 76 } 77 } 78 79 if (DumpAsm) errs() << "Here's the assembly:\n" << *M.get(); 80 81 // Infer the output filename if needed. 82 if (OutputFilename.empty()) { 83 if (InputFilename == "-") { 84 OutputFilename = "-"; 85 } else { 86 std::string IFN = InputFilename; 87 int Len = IFN.length(); 88 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') { 89 // Source ends in .ll 90 OutputFilename = std::string(IFN.begin(), IFN.end()-3); 91 } else { 92 OutputFilename = IFN; // Append a .bc to it 93 } 94 OutputFilename += ".bc"; 95 } 96 } 97 98 std::string ErrorInfo; 99 std::auto_ptr<raw_ostream> Out 100 (new raw_fd_ostream(OutputFilename.c_str(), ErrorInfo, 101 (Force?raw_fd_ostream::F_Force : 0) | 102 raw_fd_ostream::F_Binary)); 103 if (!ErrorInfo.empty()) { 104 errs() << ErrorInfo << '\n'; 105 if (!Force) 106 errs() << "Use -f command line argument to force output\n"; 107 return 1; 108 } 109 110 111 // Make sure that the Out file gets unlinked from the disk if we get a 112 // SIGINT. 113 if (OutputFilename != "-") 114 sys::RemoveFileOnSignal(sys::Path(OutputFilename)); 115 116 if (!DisableOutput) 117 if (Force || !CheckBitcodeOutputToConsole(*Out, true)) 118 WriteBitcodeToFile(M.get(), *Out); 119 return 0; 120 } 121 122