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 void WriteOutputFile(const Module *M) { 55 // Infer the output filename if needed. 56 if (OutputFilename.empty()) { 57 if (InputFilename == "-") { 58 OutputFilename = "-"; 59 } else { 60 std::string IFN = InputFilename; 61 int Len = IFN.length(); 62 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') { 63 // Source ends in .ll 64 OutputFilename = std::string(IFN.begin(), IFN.end()-3); 65 } else { 66 OutputFilename = IFN; // Append a .bc to it 67 } 68 OutputFilename += ".bc"; 69 } 70 } 71 72 std::string ErrorInfo; 73 std::unique_ptr<tool_output_file> Out( 74 new tool_output_file(OutputFilename.c_str(), ErrorInfo, sys::fs::F_None)); 75 if (!ErrorInfo.empty()) { 76 errs() << ErrorInfo << '\n'; 77 exit(1); 78 } 79 80 if (Force || !CheckBitcodeOutputToConsole(Out->os(), true)) 81 WriteBitcodeToFile(M, Out->os()); 82 83 // Declare success. 84 Out->keep(); 85 } 86 87 int main(int argc, char **argv) { 88 // Print a stack trace if we signal out. 89 sys::PrintStackTraceOnErrorSignal(); 90 PrettyStackTraceProgram X(argc, argv); 91 LLVMContext &Context = getGlobalContext(); 92 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 93 cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n"); 94 95 // Parse the file now... 96 SMDiagnostic Err; 97 std::unique_ptr<Module> M(ParseAssemblyFile(InputFilename, Err, Context)); 98 if (!M.get()) { 99 Err.print(argv[0], errs()); 100 return 1; 101 } 102 103 if (!DisableVerify) { 104 std::string ErrorStr; 105 raw_string_ostream OS(ErrorStr); 106 if (verifyModule(*M.get(), &OS)) { 107 errs() << argv[0] 108 << ": assembly parsed, but does not verify as correct!\n"; 109 errs() << OS.str(); 110 return 1; 111 } 112 } 113 114 if (DumpAsm) errs() << "Here's the assembly:\n" << *M.get(); 115 116 if (!DisableOutput) 117 WriteOutputFile(M.get()); 118 119 return 0; 120 } 121
