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/Verifier.h" 23 #include "llvm/Support/CommandLine.h" 24 #include "llvm/Support/FileSystem.h" 25 #include "llvm/Support/ManagedStatic.h" 26 #include "llvm/Support/PrettyStackTrace.h" 27 #include "llvm/Support/Signals.h" 28 #include "llvm/Support/SourceMgr.h" 29 #include "llvm/Support/SystemUtils.h" 30 #include "llvm/Support/ToolOutputFile.h" 31 #include <memory> 32 using namespace llvm; 33 34 static cl::opt<std::string> 35 InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-")); 36 37 static cl::opt<std::string> 38 OutputFilename("o", cl::desc("Override output filename"), 39 cl::value_desc("filename")); 40 41 static cl::opt<bool> 42 Force("f", cl::desc("Enable binary output on terminals")); 43 44 static cl::opt<bool> 45 DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false)); 46 47 static cl::opt<bool> 48 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden); 49 50 static cl::opt<bool> 51 DisableVerify("disable-verify", cl::Hidden, 52 cl::desc("Do not run verifier on input LLVM (dangerous!)")); 53 54 static cl::opt<bool> PreserveBitcodeUseListOrder( 55 "preserve-bc-uselistorder", 56 cl::desc("Preserve use-list order when writing LLVM bitcode."), 57 cl::init(true), cl::Hidden); 58 59 static void WriteOutputFile(const Module *M) { 60 // Infer the output filename if needed. 61 if (OutputFilename.empty()) { 62 if (InputFilename == "-") { 63 OutputFilename = "-"; 64 } else { 65 std::string IFN = InputFilename; 66 int Len = IFN.length(); 67 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') { 68 // Source ends in .ll 69 OutputFilename = std::string(IFN.begin(), IFN.end()-3); 70 } else { 71 OutputFilename = IFN; // Append a .bc to it 72 } 73 OutputFilename += ".bc"; 74 } 75 } 76 77 std::error_code EC; 78 std::unique_ptr<tool_output_file> Out( 79 new tool_output_file(OutputFilename, EC, sys::fs::F_None)); 80 if (EC) { 81 errs() << EC.message() << '\n'; 82 exit(1); 83 } 84 85 if (Force || !CheckBitcodeOutputToConsole(Out->os(), true)) 86 WriteBitcodeToFile(M, Out->os(), PreserveBitcodeUseListOrder); 87 88 // Declare success. 89 Out->keep(); 90 } 91 92 int main(int argc, char **argv) { 93 // Print a stack trace if we signal out. 94 sys::PrintStackTraceOnErrorSignal(); 95 PrettyStackTraceProgram X(argc, argv); 96 LLVMContext &Context = getGlobalContext(); 97 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 98 cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n"); 99 100 // Parse the file now... 101 SMDiagnostic Err; 102 std::unique_ptr<Module> M = parseAssemblyFile(InputFilename, Err, Context); 103 if (!M.get()) { 104 Err.print(argv[0], errs()); 105 return 1; 106 } 107 108 if (!DisableVerify) { 109 std::string ErrorStr; 110 raw_string_ostream OS(ErrorStr); 111 if (verifyModule(*M.get(), &OS)) { 112 errs() << argv[0] 113 << ": assembly parsed, but does not verify as correct!\n"; 114 errs() << OS.str(); 115 return 1; 116 } 117 } 118 119 if (DumpAsm) errs() << "Here's the assembly:\n" << *M.get(); 120 121 if (!DisableOutput) 122 WriteOutputFile(M.get()); 123 124 return 0; 125 } 126
