llvm-rs-as.cpp revision ee4016d1247d3fbe50822de279d3da273d8aef4c
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/ADT/OwningPtr.h" 19#include "llvm/IR/LLVMContext.h" 20#include "llvm/IR/Verifier.h" 21#include "llvm/AsmParser/Parser.h" 22#include "llvm/Bitcode/ReaderWriter.h" 23#include "llvm/IR/Module.h" 24#include "llvm/Support/CommandLine.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 32#include "BitWriter_3_2/ReaderWriter_3_2.h" 33#include "BitWriter_2_9/ReaderWriter_2_9.h" 34#include "BitWriter_2_9_func/ReaderWriter_2_9_func.h" 35 36#include <memory> 37using namespace llvm; 38 39static cl::opt<std::string> 40InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-")); 41 42static cl::opt<std::string> 43OutputFilename("o", cl::desc("Override output filename"), 44 cl::value_desc("filename")); 45 46static cl::opt<bool> 47Force("f", cl::desc("Enable binary output on terminals")); 48 49static cl::opt<bool> 50DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false)); 51 52static cl::opt<bool> 53DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden); 54 55static cl::opt<bool> 56DisableVerify("disable-verify", cl::Hidden, 57 cl::desc("Do not run verifier on input LLVM (dangerous!)")); 58 59enum BCVersion { 60 BC29, BC29Func, BC32, BCHEAD 61}; 62 63cl::opt<BCVersion> BitcodeVersion("bitcode-version", 64 cl::desc("Set the bitcode version to be written:"), 65 cl::values( 66 clEnumValN(BC29, "BC29", "Version 2.9"), 67 clEnumVal(BC29Func, "Version 2.9 func"), 68 clEnumVal(BC32, "Version 3.2"), 69 clEnumVal(BCHEAD, "Most current version"), 70 clEnumValEnd), cl::init(BC32)); 71 72static void WriteOutputFile(const Module *M) { 73 // Infer the output filename if needed. 74 if (OutputFilename.empty()) { 75 if (InputFilename == "-") { 76 OutputFilename = "-"; 77 } else { 78 std::string IFN = InputFilename; 79 int Len = IFN.length(); 80 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') { 81 // Source ends in .ll 82 OutputFilename = std::string(IFN.begin(), IFN.end()-3); 83 } else { 84 OutputFilename = IFN; // Append a .bc to it 85 } 86 OutputFilename += ".bc"; 87 } 88 } 89 90 std::string ErrorInfo; 91 OwningPtr<tool_output_file> Out 92 (new tool_output_file(OutputFilename.c_str(), ErrorInfo, 93 llvm::sys::fs::F_None)); 94 if (!ErrorInfo.empty()) { 95 errs() << ErrorInfo << '\n'; 96 exit(1); 97 } 98 99 if (Force || !CheckBitcodeOutputToConsole(Out->os(), true)) { 100 switch(BitcodeVersion) { 101 case BC29: 102 llvm_2_9::WriteBitcodeToFile(M, Out->os()); 103 break; 104 case BC29Func: 105 llvm_2_9_func::WriteBitcodeToFile(M, Out->os()); 106 break; 107 case BC32: 108 llvm_3_2::WriteBitcodeToFile(M, Out->os()); 109 break; 110 case BCHEAD: 111 llvm::WriteBitcodeToFile(M, Out->os()); 112 break; 113 } 114 } 115 116 // Declare success. 117 Out->keep(); 118} 119 120int main(int argc, char **argv) { 121 // Print a stack trace if we signal out. 122 sys::PrintStackTraceOnErrorSignal(); 123 PrettyStackTraceProgram X(argc, argv); 124 LLVMContext &Context = getGlobalContext(); 125 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 126 cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n"); 127 128 // Parse the file now... 129 SMDiagnostic Err; 130 OwningPtr<Module> M(ParseAssemblyFile(InputFilename, Err, Context)); 131 if (M.get() == 0) { 132 Err.print(argv[0], errs()); 133 return 1; 134 } 135 136 if (!DisableVerify) { 137 std::string Err; 138 raw_string_ostream stream(Err); 139 if (verifyModule(*M.get(), &stream)) { 140 errs() << argv[0] 141 << ": assembly parsed, but does not verify as correct!\n"; 142 errs() << Err; 143 return 1; 144 } 145 } 146 147 if (DumpAsm) errs() << "Here's the assembly:\n" << *M.get(); 148 149 if (!DisableOutput) 150 WriteOutputFile(M.get()); 151 152 return 0; 153} 154