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 int exitCode = 0; 62 raw_ostream *Out = 0; 63 try { 64 // Parse the file now... 65 SMDiagnostic Err; 66 std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename, Err, Context)); 67 if (M.get() == 0) { 68 Err.Print(argv[0], errs()); 69 return 1; 70 } 71 72 if (!DisableVerify) { 73 std::string Err; 74 if (verifyModule(*M.get(), ReturnStatusAction, &Err)) { 75 errs() << argv[0] 76 << ": assembly parsed, but does not verify as correct!\n"; 77 errs() << Err; 78 return 1; 79 } 80 } 81 82 if (DumpAsm) errs() << "Here's the assembly:\n" << *M.get(); 83 84 if (OutputFilename != "") { // Specified an output filename? 85 if (OutputFilename != "-") { // Not stdout? 86 std::string ErrorInfo; 87 Out = new raw_fd_ostream(OutputFilename.c_str(), /*Binary=*/true, 88 Force, ErrorInfo); 89 if (!ErrorInfo.empty()) { 90 errs() << ErrorInfo << '\n'; 91 if (!Force) 92 errs() << "Use -f command line argument to force output\n"; 93 delete Out; 94 return 1; 95 } 96 } else { // Specified stdout 97 // FIXME: outs() is not binary! 98 Out = &outs(); 99 } 100 } else { 101 if (InputFilename == "-") { 102 OutputFilename = "-"; 103 Out = &outs(); 104 } else { 105 std::string IFN = InputFilename; 106 int Len = IFN.length(); 107 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') { 108 // Source ends in .ll 109 OutputFilename = std::string(IFN.begin(), IFN.end()-3); 110 } else { 111 OutputFilename = IFN; // Append a .bc to it 112 } 113 OutputFilename += ".bc"; 114 115 std::string ErrorInfo; 116 Out = new raw_fd_ostream(OutputFilename.c_str(), /*Binary=*/true, 117 Force, ErrorInfo); 118 if (!ErrorInfo.empty()) { 119 errs() << ErrorInfo << '\n'; 120 if (!Force) 121 errs() << "Use -f command line argument to force output\n"; 122 delete Out; 123 return 1; 124 } 125 // Make sure that the Out file gets unlinked from the disk if we get a 126 // SIGINT 127 sys::RemoveFileOnSignal(sys::Path(OutputFilename)); 128 } 129 } 130 131 if (!DisableOutput) 132 if (Force || !CheckBitcodeOutputToConsole(Out,true)) 133 WriteBitcodeToFile(M.get(), *Out); 134 } catch (const std::string& msg) { 135 errs() << argv[0] << ": " << msg << "\n"; 136 exitCode = 1; 137 } catch (...) { 138 errs() << argv[0] << ": Unexpected unknown exception occurred.\n"; 139 exitCode = 1; 140 } 141 142 if (Out != &outs()) delete Out; 143 return exitCode; 144 } 145 146