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/IR/LLVMContext.h" 19 #include "llvm/AsmParser/Parser.h" 20 #include "llvm/Bitcode/ReaderWriter.h" 21 #include "llvm/IR/Module.h" 22 #include "llvm/IR/UseListOrder.h" 23 #include "llvm/IR/Verifier.h" 24 #include "llvm/Support/CommandLine.h" 25 #include "llvm/Support/FileSystem.h" 26 #include "llvm/Support/ManagedStatic.h" 27 #include "llvm/Support/PrettyStackTrace.h" 28 #include "llvm/Support/Signals.h" 29 #include "llvm/Support/SourceMgr.h" 30 #include "llvm/Support/SystemUtils.h" 31 #include "llvm/Support/ToolOutputFile.h" 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("Enable binary output on terminals")); 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 static void WriteOutputFile(const Module *M) { 56 // Infer the output filename if needed. 57 if (OutputFilename.empty()) { 58 if (InputFilename == "-") { 59 OutputFilename = "-"; 60 } else { 61 std::string IFN = InputFilename; 62 int Len = IFN.length(); 63 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') { 64 // Source ends in .ll 65 OutputFilename = std::string(IFN.begin(), IFN.end()-3); 66 } else { 67 OutputFilename = IFN; // Append a .bc to it 68 } 69 OutputFilename += ".bc"; 70 } 71 } 72 73 std::error_code EC; 74 std::unique_ptr<tool_output_file> Out( 75 new tool_output_file(OutputFilename, EC, sys::fs::F_None)); 76 if (EC) { 77 errs() << EC.message() << '\n'; 78 exit(1); 79 } 80 81 if (Force || !CheckBitcodeOutputToConsole(Out->os(), true)) 82 WriteBitcodeToFile(M, Out->os()); 83 84 // Declare success. 85 Out->keep(); 86 } 87 88 int main(int argc, char **argv) { 89 // Print a stack trace if we signal out. 90 sys::PrintStackTraceOnErrorSignal(); 91 PrettyStackTraceProgram X(argc, argv); 92 LLVMContext &Context = getGlobalContext(); 93 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 94 95 // Turn on -preserve-bc-uselistorder by default, but let the command-line 96 // override it. 97 setPreserveBitcodeUseListOrder(true); 98 99 cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n"); 100 101 // Parse the file now... 102 SMDiagnostic Err; 103 std::unique_ptr<Module> M = parseAssemblyFile(InputFilename, Err, Context); 104 if (!M.get()) { 105 Err.print(argv[0], errs()); 106 return 1; 107 } 108 109 if (!DisableVerify) { 110 std::string ErrorStr; 111 raw_string_ostream OS(ErrorStr); 112 if (verifyModule(*M.get(), &OS)) { 113 errs() << argv[0] 114 << ": assembly parsed, but does not verify as correct!\n"; 115 errs() << OS.str(); 116 return 1; 117 } 118 } 119 120 if (DumpAsm) errs() << "Here's the assembly:\n" << *M.get(); 121 122 if (!DisableOutput) 123 WriteOutputFile(M.get()); 124 125 return 0; 126 } 127