tools/llvm-mc/llvm-mc.cpp

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