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/MCAsmLexer.h" 16 #include "llvm/MC/MCContext.h" 17 #include "llvm/MC/MCCodeEmitter.h" 18 #include "llvm/MC/MCInstPrinter.h" 19 #include "llvm/MC/MCSectionMachO.h" 20 #include "llvm/MC/MCStreamer.h" 21 #include "llvm/ADT/OwningPtr.h" 22 #include "llvm/Support/CommandLine.h" 23 #include "llvm/Support/FormattedStream.h" 24 #include "llvm/Support/ManagedStatic.h" 25 #include "llvm/Support/MemoryBuffer.h" 26 #include "llvm/Support/PrettyStackTrace.h" 27 #include "llvm/Support/SourceMgr.h" 28 #include "llvm/Support/raw_ostream.h" 29 #include "llvm/System/Signals.h" 30 #include "llvm/Target/TargetAsmParser.h" 31 #include "llvm/Target/TargetRegistry.h" 32 #include "llvm/Target/TargetMachine.h" // FIXME. 33 #include "llvm/Target/TargetSelect.h" 34 #include "AsmParser.h" 35 using namespace llvm; 36 37 static cl::opt<std::string> 38 InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-")); 39 40 static cl::opt<std::string> 41 OutputFilename("o", cl::desc("Output filename"), 42 cl::value_desc("filename")); 43 44 static cl::opt<bool> 45 ShowEncoding("show-encoding", cl::desc("Show instruction encodings")); 46 47 static cl::opt<unsigned> 48 OutputAsmVariant("output-asm-variant", 49 cl::desc("Syntax variant to use for output printing")); 50 51 enum OutputFileType { 52 OFT_AssemblyFile, 53 OFT_ObjectFile 54 }; 55 static cl::opt<OutputFileType> 56 FileType("filetype", cl::init(OFT_AssemblyFile), 57 cl::desc("Choose an output file type:"), 58 cl::values( 59 clEnumValN(OFT_AssemblyFile, "asm", 60 "Emit an assembly ('.s') file"), 61 clEnumValN(OFT_ObjectFile, "obj", 62 "Emit a native object ('.o') file"), 63 clEnumValEnd)); 64 65 static cl::opt<bool> 66 Force("f", cl::desc("Enable binary output on terminals")); 67 68 static cl::list<std::string> 69 IncludeDirs("I", cl::desc("Directory of include files"), 70 cl::value_desc("directory"), cl::Prefix); 71 72 static cl::opt<std::string> 73 TripleName("triple", cl::desc("Target triple to assemble for," 74 "see -version for available targets"), 75 cl::init(LLVM_HOSTTRIPLE)); 76 77 enum ActionType { 78 AC_AsLex, 79 AC_Assemble 80 }; 81 82 static cl::opt<ActionType> 83 Action(cl::desc("Action to perform:"), 84 cl::init(AC_Assemble), 85 cl::values(clEnumValN(AC_AsLex, "as-lex", 86 "Lex tokens from a .s file"), 87 clEnumValN(AC_Assemble, "assemble", 88 "Assemble a .s file (default)"), 89 clEnumValEnd)); 90 91 static const Target *GetTarget(const char *ProgName) { 92 // Get the target specific parser. 93 std::string Error; 94 const Target *TheTarget = TargetRegistry::lookupTarget(TripleName, Error); 95 if (TheTarget) 96 return TheTarget; 97 98 errs() << ProgName << ": error: unable to get target for '" << TripleName 99 << "', see --version and --triple.\n"; 100 return 0; 101 } 102 103 static int AsLexInput(const char *ProgName) { 104 std::string ErrorMessage; 105 MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename, 106 &ErrorMessage); 107 if (Buffer == 0) { 108 errs() << ProgName << ": "; 109 if (ErrorMessage.size()) 110 errs() << ErrorMessage << "\n"; 111 else 112 errs() << "input file didn't read correctly.\n"; 113 return 1; 114 } 115 116 SourceMgr SrcMgr; 117 118 // Tell SrcMgr about this buffer, which is what TGParser will pick up. 119 SrcMgr.AddNewSourceBuffer(Buffer, SMLoc()); 120 121 // Record the location of the include directories so that the lexer can find 122 // it later. 123 SrcMgr.setIncludeDirs(IncludeDirs); 124 125 const Target *TheTarget = GetTarget(ProgName); 126 if (!TheTarget) 127 return 1; 128 129 const MCAsmInfo *MAI = TheTarget->createAsmInfo(TripleName); 130 assert(MAI && "Unable to create target asm info!"); 131 132 AsmLexer Lexer(SrcMgr, *MAI); 133 134 bool Error = false; 135 136 while (Lexer.Lex().isNot(AsmToken::Eof)) { 137 switch (Lexer.getKind()) { 138 default: 139 Lexer.PrintMessage(Lexer.getLoc(), "unknown token", "warning"); 140 Error = true; 141 break; 142 case AsmToken::Error: 143 Error = true; // error already printed. 144 break; 145 case AsmToken::Identifier: 146 outs() << "identifier: " << Lexer.getTok().getString() << '\n'; 147 break; 148 case AsmToken::String: 149 outs() << "string: " << Lexer.getTok().getString() << '\n'; 150 break; 151 case AsmToken::Integer: 152 outs() << "int: " << Lexer.getTok().getString() << '\n'; 153 break; 154 155 case AsmToken::Amp: outs() << "Amp\n"; break; 156 case AsmToken::AmpAmp: outs() << "AmpAmp\n"; break; 157 case AsmToken::Caret: outs() << "Caret\n"; break; 158 case AsmToken::Colon: outs() << "Colon\n"; break; 159 case AsmToken::Comma: outs() << "Comma\n"; break; 160 case AsmToken::Dollar: outs() << "Dollar\n"; break; 161 case AsmToken::EndOfStatement: outs() << "EndOfStatement\n"; break; 162 case AsmToken::Eof: outs() << "Eof\n"; break; 163 case AsmToken::Equal: outs() << "Equal\n"; break; 164 case AsmToken::EqualEqual: outs() << "EqualEqual\n"; break; 165 case AsmToken::Exclaim: outs() << "Exclaim\n"; break; 166 case AsmToken::ExclaimEqual: outs() << "ExclaimEqual\n"; break; 167 case AsmToken::Greater: outs() << "Greater\n"; break; 168 case AsmToken::GreaterEqual: outs() << "GreaterEqual\n"; break; 169 case AsmToken::GreaterGreater: outs() << "GreaterGreater\n"; break; 170 case AsmToken::LParen: outs() << "LParen\n"; break; 171 case AsmToken::Less: outs() << "Less\n"; break; 172 case AsmToken::LessEqual: outs() << "LessEqual\n"; break; 173 case AsmToken::LessGreater: outs() << "LessGreater\n"; break; 174 case AsmToken::LessLess: outs() << "LessLess\n"; break; 175 case AsmToken::Minus: outs() << "Minus\n"; break; 176 case AsmToken::Percent: outs() << "Percent\n"; break; 177 case AsmToken::Pipe: outs() << "Pipe\n"; break; 178 case AsmToken::PipePipe: outs() << "PipePipe\n"; break; 179 case AsmToken::Plus: outs() << "Plus\n"; break; 180 case AsmToken::RParen: outs() << "RParen\n"; break; 181 case AsmToken::Slash: outs() << "Slash\n"; break; 182 case AsmToken::Star: outs() << "Star\n"; break; 183 case AsmToken::Tilde: outs() << "Tilde\n"; break; 184 } 185 } 186 187 return Error; 188 } 189 190 static formatted_raw_ostream *GetOutputStream() { 191 if (OutputFilename == "") 192 OutputFilename = "-"; 193 194 // Make sure that the Out file gets unlinked from the disk if we get a 195 // SIGINT. 196 if (OutputFilename != "-") 197 sys::RemoveFileOnSignal(sys::Path(OutputFilename)); 198 199 std::string Err; 200 raw_fd_ostream *Out = new raw_fd_ostream(OutputFilename.c_str(), Err, 201 raw_fd_ostream::F_Binary); 202 if (!Err.empty()) { 203 errs() << Err << '\n'; 204 delete Out; 205 return 0; 206 } 207 208 return new formatted_raw_ostream(*Out, formatted_raw_ostream::DELETE_STREAM); 209 } 210 211 static int AssembleInput(const char *ProgName) { 212 const Target *TheTarget = GetTarget(ProgName); 213 if (!TheTarget) 214 return 1; 215 216 std::string Error; 217 MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename, &Error); 218 if (Buffer == 0) { 219 errs() << ProgName << ": "; 220 if (Error.size()) 221 errs() << Error << "\n"; 222 else 223 errs() << "input file didn't read correctly.\n"; 224 return 1; 225 } 226 227 SourceMgr SrcMgr; 228 229 // Tell SrcMgr about this buffer, which is what the parser will pick up. 230 SrcMgr.AddNewSourceBuffer(Buffer, SMLoc()); 231 232 // Record the location of the include directories so that the lexer can find 233 // it later. 234 SrcMgr.setIncludeDirs(IncludeDirs); 235 236 MCContext Ctx; 237 formatted_raw_ostream *Out = GetOutputStream(); 238 if (!Out) 239 return 1; 240 241 242 // FIXME: We shouldn't need to do this (and link in codegen). 243 OwningPtr<TargetMachine> TM(TheTarget->createTargetMachine(TripleName, "")); 244 245 if (!TM) { 246 errs() << ProgName << ": error: could not create target for triple '" 247 << TripleName << "'.\n"; 248 return 1; 249 } 250 251 OwningPtr<MCInstPrinter> IP; 252 OwningPtr<MCCodeEmitter> CE; 253 OwningPtr<MCStreamer> Str; 254 255 const MCAsmInfo *MAI = TheTarget->createAsmInfo(TripleName); 256 assert(MAI && "Unable to create target asm info!"); 257 258 if (FileType == OFT_AssemblyFile) { 259 IP.reset(TheTarget->createMCInstPrinter(OutputAsmVariant, *MAI, *Out)); 260 if (ShowEncoding) 261 CE.reset(TheTarget->createCodeEmitter(*TM)); 262 Str.reset(createAsmStreamer(Ctx, *Out, *MAI, IP.get(), CE.get())); 263 } else { 264 assert(FileType == OFT_ObjectFile && "Invalid file type!"); 265 CE.reset(TheTarget->createCodeEmitter(*TM)); 266 Str.reset(createMachOStreamer(Ctx, *Out, CE.get())); 267 } 268 269 AsmParser Parser(SrcMgr, Ctx, *Str.get(), *MAI); 270 OwningPtr<TargetAsmParser> TAP(TheTarget->createAsmParser(Parser)); 271 if (!TAP) { 272 errs() << ProgName 273 << ": error: this target does not support assembly parsing.\n"; 274 return 1; 275 } 276 277 Parser.setTargetParser(*TAP.get()); 278 279 int Res = Parser.Run(); 280 if (Out != &fouts()) 281 delete Out; 282 283 return Res; 284 } 285 286 287 int main(int argc, char **argv) { 288 // Print a stack trace if we signal out. 289 sys::PrintStackTraceOnErrorSignal(); 290 PrettyStackTraceProgram X(argc, argv); 291 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 292 293 // Initialize targets and assembly printers/parsers. 294 llvm::InitializeAllTargetInfos(); 295 // FIXME: We shouldn't need to initialize the Target(Machine)s. 296 llvm::InitializeAllTargets(); 297 llvm::InitializeAllAsmPrinters(); 298 llvm::InitializeAllAsmParsers(); 299 300 cl::ParseCommandLineOptions(argc, argv, "llvm machine code playground\n"); 301 302 switch (Action) { 303 default: 304 case AC_AsLex: 305 return AsLexInput(argv[0]); 306 case AC_Assemble: 307 return AssembleInput(argv[0]); 308 } 309 310 return 0; 311 } 312 313