1 //===-- llvm-mc.cpp - Machine Code Hacking Driver -------------------------===// 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 is a simple driver that allows command line hacking on machine 11 // code. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "llvm/MC/MCContext.h" 16 #include "llvm/MC/MCCodeEmitter.h" 17 #include "llvm/MC/MCSectionMachO.h" 18 #include "llvm/MC/MCStreamer.h" 19 #include "llvm/ADT/OwningPtr.h" 20 #include "llvm/CodeGen/AsmPrinter.h" 21 #include "llvm/Support/CommandLine.h" 22 #include "llvm/Support/FormattedStream.h" 23 #include "llvm/Support/ManagedStatic.h" 24 #include "llvm/Support/MemoryBuffer.h" 25 #include "llvm/Support/PrettyStackTrace.h" 26 #include "llvm/Support/SourceMgr.h" 27 #include "llvm/Support/raw_ostream.h" 28 #include "llvm/System/Signals.h" 29 #include "llvm/Target/TargetAsmParser.h" 30 #include "llvm/Target/TargetRegistry.h" 31 #include "llvm/Target/TargetSelect.h" 32 #include "AsmParser.h" 33 using namespace llvm; 34 35 static cl::opt<std::string> 36 InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-")); 37 38 static cl::opt<std::string> 39 OutputFilename("o", cl::desc("Output filename"), 40 cl::value_desc("filename")); 41 42 static cl::opt<bool> 43 ShowEncoding("show-encoding", cl::desc("Show instruction encodings")); 44 45 enum OutputFileType { 46 OFT_AssemblyFile, 47 OFT_ObjectFile 48 }; 49 static cl::opt<OutputFileType> 50 FileType("filetype", cl::init(OFT_AssemblyFile), 51 cl::desc("Choose an output file type:"), 52 cl::values( 53 clEnumValN(OFT_AssemblyFile, "asm", 54 "Emit an assembly ('.s') file"), 55 clEnumValN(OFT_ObjectFile, "obj", 56 "Emit a native object ('.o') file"), 57 clEnumValEnd)); 58 59 static cl::opt<bool> 60 Force("f", cl::desc("Enable binary output on terminals")); 61 62 static cl::list<std::string> 63 IncludeDirs("I", cl::desc("Directory of include files"), 64 cl::value_desc("directory"), cl::Prefix); 65 66 static cl::opt<std::string> 67 TripleName("triple", cl::desc("Target triple to assemble for," 68 "see -version for available targets"), 69 cl::init(LLVM_HOSTTRIPLE)); 70 71 enum ActionType { 72 AC_AsLex, 73 AC_Assemble 74 }; 75 76 static cl::opt<ActionType> 77 Action(cl::desc("Action to perform:"), 78 cl::init(AC_Assemble), 79 cl::values(clEnumValN(AC_AsLex, "as-lex", 80 "Lex tokens from a .s file"), 81 clEnumValN(AC_Assemble, "assemble", 82 "Assemble a .s file (default)"), 83 clEnumValEnd)); 84 85 static int AsLexInput(const char *ProgName) { 86 std::string ErrorMessage; 87 MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename, 88 &ErrorMessage); 89 if (Buffer == 0) { 90 errs() << ProgName << ": "; 91 if (ErrorMessage.size()) 92 errs() << ErrorMessage << "\n"; 93 else 94 errs() << "input file didn't read correctly.\n"; 95 return 1; 96 } 97 98 SourceMgr SrcMgr; 99 100 // Tell SrcMgr about this buffer, which is what TGParser will pick up. 101 SrcMgr.AddNewSourceBuffer(Buffer, SMLoc()); 102 103 // Record the location of the include directories so that the lexer can find 104 // it later. 105 SrcMgr.setIncludeDirs(IncludeDirs); 106 107 AsmLexer Lexer(SrcMgr); 108 109 bool Error = false; 110 111 while (Lexer.Lex().isNot(AsmToken::Eof)) { 112 switch (Lexer.getKind()) { 113 default: 114 Lexer.PrintMessage(Lexer.getLoc(), "unknown token", "warning"); 115 Error = true; 116 break; 117 case AsmToken::Error: 118 Error = true; // error already printed. 119 break; 120 case AsmToken::Identifier: 121 outs() << "identifier: " << Lexer.getTok().getString() << '\n'; 122 break; 123 case AsmToken::Register: 124 outs() << "register: " << Lexer.getTok().getString() << '\n'; 125 break; 126 case AsmToken::String: 127 outs() << "string: " << Lexer.getTok().getString() << '\n'; 128 break; 129 case AsmToken::Integer: 130 outs() << "int: " << Lexer.getTok().getString() << '\n'; 131 break; 132 133 case AsmToken::Amp: outs() << "Amp\n"; break; 134 case AsmToken::AmpAmp: outs() << "AmpAmp\n"; break; 135 case AsmToken::Caret: outs() << "Caret\n"; break; 136 case AsmToken::Colon: outs() << "Colon\n"; break; 137 case AsmToken::Comma: outs() << "Comma\n"; break; 138 case AsmToken::Dollar: outs() << "Dollar\n"; break; 139 case AsmToken::EndOfStatement: outs() << "EndOfStatement\n"; break; 140 case AsmToken::Eof: outs() << "Eof\n"; break; 141 case AsmToken::Equal: outs() << "Equal\n"; break; 142 case AsmToken::EqualEqual: outs() << "EqualEqual\n"; break; 143 case AsmToken::Exclaim: outs() << "Exclaim\n"; break; 144 case AsmToken::ExclaimEqual: outs() << "ExclaimEqual\n"; break; 145 case AsmToken::Greater: outs() << "Greater\n"; break; 146 case AsmToken::GreaterEqual: outs() << "GreaterEqual\n"; break; 147 case AsmToken::GreaterGreater: outs() << "GreaterGreater\n"; break; 148 case AsmToken::LParen: outs() << "LParen\n"; break; 149 case AsmToken::Less: outs() << "Less\n"; break; 150 case AsmToken::LessEqual: outs() << "LessEqual\n"; break; 151 case AsmToken::LessGreater: outs() << "LessGreater\n"; break; 152 case AsmToken::LessLess: outs() << "LessLess\n"; break; 153 case AsmToken::Minus: outs() << "Minus\n"; break; 154 case AsmToken::Percent: outs() << "Percent\n"; break; 155 case AsmToken::Pipe: outs() << "Pipe\n"; break; 156 case AsmToken::PipePipe: outs() << "PipePipe\n"; break; 157 case AsmToken::Plus: outs() << "Plus\n"; break; 158 case AsmToken::RParen: outs() << "RParen\n"; break; 159 case AsmToken::Slash: outs() << "Slash\n"; break; 160 case AsmToken::Star: outs() << "Star\n"; break; 161 case AsmToken::Tilde: outs() << "Tilde\n"; break; 162 } 163 } 164 165 return Error; 166 } 167 168 static const Target *GetTarget(const char *ProgName) { 169 // Get the target specific parser. 170 std::string Error; 171 const Target *TheTarget = TargetRegistry::lookupTarget(TripleName, Error); 172 if (TheTarget) 173 return TheTarget; 174 175 errs() << ProgName << ": error: unable to get target for '" << TripleName 176 << "', see --version and --triple.\n"; 177 return 0; 178 } 179 180 static formatted_raw_ostream *GetOutputStream() { 181 if (OutputFilename == "") 182 OutputFilename = "-"; 183 184 // Make sure that the Out file gets unlinked from the disk if we get a 185 // SIGINT. 186 if (OutputFilename != "-") 187 sys::RemoveFileOnSignal(sys::Path(OutputFilename)); 188 189 std::string Err; 190 raw_fd_ostream *Out = new raw_fd_ostream(OutputFilename.c_str(), Err, 191 raw_fd_ostream::F_Binary); 192 if (!Err.empty()) { 193 errs() << Err << '\n'; 194 delete Out; 195 return 0; 196 } 197 198 return new formatted_raw_ostream(*Out, formatted_raw_ostream::DELETE_STREAM); 199 } 200 201 static int AssembleInput(const char *ProgName) { 202 const Target *TheTarget = GetTarget(ProgName); 203 if (!TheTarget) 204 return 1; 205 206 std::string Error; 207 MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename, &Error); 208 if (Buffer == 0) { 209 errs() << ProgName << ": "; 210 if (Error.size()) 211 errs() << Error << "\n"; 212 else 213 errs() << "input file didn't read correctly.\n"; 214 return 1; 215 } 216 217 SourceMgr SrcMgr; 218 219 // Tell SrcMgr about this buffer, which is what the parser will pick up. 220 SrcMgr.AddNewSourceBuffer(Buffer, SMLoc()); 221 222 // Record the location of the include directories so that the lexer can find 223 // it later. 224 SrcMgr.setIncludeDirs(IncludeDirs); 225 226 MCContext Ctx; 227 formatted_raw_ostream *Out = GetOutputStream(); 228 if (!Out) 229 return 1; 230 231 232 // FIXME: We shouldn't need to do this (and link in codegen). 233 OwningPtr<TargetMachine> TM(TheTarget->createTargetMachine(TripleName, "")); 234 235 if (!TM) { 236 errs() << ProgName << ": error: could not create target for triple '" 237 << TripleName << "'.\n"; 238 return 1; 239 } 240 241 OwningPtr<AsmPrinter> AP; 242 OwningPtr<MCCodeEmitter> CE; 243 OwningPtr<MCStreamer> Str; 244 245 if (FileType == OFT_AssemblyFile) { 246 const MCAsmInfo *TAI = TheTarget->createAsmInfo(TripleName); 247 assert(TAI && "Unable to create target asm info!"); 248 249 AP.reset(TheTarget->createAsmPrinter(*Out, *TM, TAI, true)); 250 if (ShowEncoding) 251 CE.reset(TheTarget->createCodeEmitter(*TM)); 252 Str.reset(createAsmStreamer(Ctx, *Out, *TAI, AP.get(), CE.get())); 253 } else { 254 assert(FileType == OFT_ObjectFile && "Invalid file type!"); 255 Str.reset(createMachOStreamer(Ctx, *Out)); 256 } 257 258 AsmParser Parser(SrcMgr, Ctx, *Str.get()); 259 OwningPtr<TargetAsmParser> TAP(TheTarget->createAsmParser(Parser)); 260 if (!TAP) { 261 errs() << ProgName 262 << ": error: this target does not support assembly parsing.\n"; 263 return 1; 264 } 265 266 Parser.setTargetParser(*TAP.get()); 267 268 int Res = Parser.Run(); 269 if (Out != &fouts()) 270 delete Out; 271 272 return Res; 273 } 274 275 276 int main(int argc, char **argv) { 277 // Print a stack trace if we signal out. 278 sys::PrintStackTraceOnErrorSignal(); 279 PrettyStackTraceProgram X(argc, argv); 280 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 281 282 // Initialize targets and assembly printers/parsers. 283 llvm::InitializeAllTargetInfos(); 284 // FIXME: We shouldn't need to initialize the Target(Machine)s. 285 llvm::InitializeAllTargets(); 286 llvm::InitializeAllAsmPrinters(); 287 llvm::InitializeAllAsmParsers(); 288 289 cl::ParseCommandLineOptions(argc, argv, "llvm machine code playground\n"); 290 291 switch (Action) { 292 default: 293 case AC_AsLex: 294 return AsLexInput(argv[0]); 295 case AC_Assemble: 296 return AssembleInput(argv[0]); 297 } 298 299 return 0; 300 } 301 302