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