src/llvm/lib/Target/MBlaze/AsmParser/MBlazeAsmParser.cpp

   1 //===-- MBlazeAsmParser.cpp - Parse MBlaze asm to MCInst instructions -----===//
   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 #include "MCTargetDesc/MBlazeBaseInfo.h"
  11 #include "llvm/MC/MCParser/MCAsmLexer.h"
  12 #include "llvm/MC/MCParser/MCAsmParser.h"
  13 #include "llvm/MC/MCParser/MCParsedAsmOperand.h"
  14 #include "llvm/MC/MCStreamer.h"
  15 #include "llvm/MC/MCExpr.h"
  16 #include "llvm/MC/MCInst.h"
  17 #include "llvm/MC/MCTargetAsmParser.h"
  18 #include "llvm/Support/SourceMgr.h"
  19 #include "llvm/Support/TargetRegistry.h"
  20 #include "llvm/Support/raw_ostream.h"
  21 #include "llvm/ADT/SmallVector.h"
  22 #include "llvm/ADT/Twine.h"
  23 using namespace llvm;
  24
  25 namespace {
  26 struct MBlazeOperand;
  27
  28 class MBlazeAsmParser : public MCTargetAsmParser {
  29   MCAsmParser &Parser;
  30
  31   MCAsmParser &getParser() const { return Parser; }
  32   MCAsmLexer &getLexer() const { return Parser.getLexer(); }
  33
  34   void Warning(SMLoc L, const Twine &Msg) { Parser.Warning(L, Msg); }
  35   bool Error(SMLoc L, const Twine &Msg) { return Parser.Error(L, Msg); }
  36
  37   MBlazeOperand *ParseMemory(SmallVectorImpl<MCParsedAsmOperand*> &Operands);
  38   MBlazeOperand *ParseRegister(unsigned &RegNo);
  39   MBlazeOperand *ParseImmediate();
  40   MBlazeOperand *ParseFsl();
  41   MBlazeOperand* ParseOperand(SmallVectorImpl<MCParsedAsmOperand*> &Operands);
  42
  43   virtual bool ParseRegister(unsigned &RegNo, SMLoc &StartLoc, SMLoc &EndLoc);
  44
  45   bool ParseDirectiveWord(unsigned Size, SMLoc L);
  46
  47   bool MatchAndEmitInstruction(SMLoc IDLoc,
  48                                SmallVectorImpl<MCParsedAsmOperand*> &Operands,
  49                                MCStreamer &Out);
  50
  51   /// @name Auto-generated Match Functions
  52   /// {
  53
  54 #define GET_ASSEMBLER_HEADER
  55 #include "MBlazeGenAsmMatcher.inc"
  56
  57   /// }
  58
  59 public:
  60   MBlazeAsmParser(MCSubtargetInfo &_STI, MCAsmParser &_Parser)
  61     : MCTargetAsmParser(), Parser(_Parser) {}
  62
  63   virtual bool ParseInstruction(StringRef Name, SMLoc NameLoc,
  64                                 SmallVectorImpl<MCParsedAsmOperand*> &Operands);
  65
  66   virtual bool ParseDirective(AsmToken DirectiveID);
  67 };
  68
  69 /// MBlazeOperand - Instances of this class represent a parsed MBlaze machine
  70 /// instruction.
  71 struct MBlazeOperand : public MCParsedAsmOperand {
  72   enum KindTy {
  73     Token,
  74     Immediate,
  75     Register,
  76     Memory,
  77     Fsl
  78   } Kind;
  79
  80   SMLoc StartLoc, EndLoc;
  81
  82   union {
  83     struct {
  84       const char *Data;
  85       unsigned Length;
  86     } Tok;
  87
  88     struct {
  89       unsigned RegNum;
  90     } Reg;
  91
  92     struct {
  93       const MCExpr *Val;
  94     } Imm;
  95
  96     struct {
  97       unsigned Base;
  98       unsigned OffReg;
  99       const MCExpr *Off;
 100     } Mem;
 101
 102     struct {
 103       const MCExpr *Val;
 104     } FslImm;
 105   };
 106
 107   MBlazeOperand(KindTy K) : MCParsedAsmOperand(), Kind(K) {}
 108 public:
 109   MBlazeOperand(const MBlazeOperand &o) : MCParsedAsmOperand() {
 110     Kind = o.Kind;
 111     StartLoc = o.StartLoc;
 112     EndLoc = o.EndLoc;
 113     switch (Kind) {
 114     case Register:
 115       Reg = o.Reg;
 116       break;
 117     case Immediate:
 118       Imm = o.Imm;
 119       break;
 120     case Token:
 121       Tok = o.Tok;
 122       break;
 123     case Memory:
 124       Mem = o.Mem;
 125       break;
 126     case Fsl:
 127       FslImm = o.FslImm;
 128       break;
 129     }
 130   }
 131
 132   /// getStartLoc - Get the location of the first token of this operand.
 133   SMLoc getStartLoc() const { return StartLoc; }
 134
 135   /// getEndLoc - Get the location of the last token of this operand.
 136   SMLoc getEndLoc() const { return EndLoc; }
 137
 138   unsigned getReg() const {
 139     assert(Kind == Register && "Invalid access!");
 140     return Reg.RegNum;
 141   }
 142
 143   const MCExpr *getImm() const {
 144     assert(Kind == Immediate && "Invalid access!");
 145     return Imm.Val;
 146   }
 147
 148   const MCExpr *getFslImm() const {
 149     assert(Kind == Fsl && "Invalid access!");
 150     return FslImm.Val;
 151   }
 152
 153   unsigned getMemBase() const {
 154     assert(Kind == Memory && "Invalid access!");
 155     return Mem.Base;
 156   }
 157
 158   const MCExpr* getMemOff() const {
 159     assert(Kind == Memory && "Invalid access!");
 160     return Mem.Off;
 161   }
 162
 163   unsigned getMemOffReg() const {
 164     assert(Kind == Memory && "Invalid access!");
 165     return Mem.OffReg;
 166   }
 167
 168   bool isToken() const { return Kind == Token; }
 169   bool isImm() const { return Kind == Immediate; }
 170   bool isMem() const { return Kind == Memory; }
 171   bool isFsl() const { return Kind == Fsl; }
 172   bool isReg() const { return Kind == Register; }
 173
 174   void addExpr(MCInst &Inst, const MCExpr *Expr) const {
 175     // Add as immediates when possible.  Null MCExpr = 0.
 176     if (Expr == 0)
 177       Inst.addOperand(MCOperand::CreateImm(0));
 178     else if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Expr))
 179       Inst.addOperand(MCOperand::CreateImm(CE->getValue()));
 180     else
 181       Inst.addOperand(MCOperand::CreateExpr(Expr));
 182   }
 183
 184   void addRegOperands(MCInst &Inst, unsigned N) const {
 185     assert(N == 1 && "Invalid number of operands!");
 186     Inst.addOperand(MCOperand::CreateReg(getReg()));
 187   }
 188
 189   void addImmOperands(MCInst &Inst, unsigned N) const {
 190     assert(N == 1 && "Invalid number of operands!");
 191     addExpr(Inst, getImm());
 192   }
 193
 194   void addFslOperands(MCInst &Inst, unsigned N) const {
 195     assert(N == 1 && "Invalid number of operands!");
 196     addExpr(Inst, getFslImm());
 197   }
 198
 199   void addMemOperands(MCInst &Inst, unsigned N) const {
 200     assert(N == 2 && "Invalid number of operands!");
 201
 202     Inst.addOperand(MCOperand::CreateReg(getMemBase()));
 203
 204     unsigned RegOff = getMemOffReg();
 205     if (RegOff)
 206       Inst.addOperand(MCOperand::CreateReg(RegOff));
 207     else
 208       addExpr(Inst, getMemOff());
 209   }
 210
 211   StringRef getToken() const {
 212     assert(Kind == Token && "Invalid access!");
 213     return StringRef(Tok.Data, Tok.Length);
 214   }
 215
 216   virtual void print(raw_ostream &OS) const;
 217
 218   static MBlazeOperand *CreateToken(StringRef Str, SMLoc S) {
 219     MBlazeOperand *Op = new MBlazeOperand(Token);
 220     Op->Tok.Data = Str.data();
 221     Op->Tok.Length = Str.size();
 222     Op->StartLoc = S;
 223     Op->EndLoc = S;
 224     return Op;
 225   }
 226
 227   static MBlazeOperand *CreateReg(unsigned RegNum, SMLoc S, SMLoc E) {
 228     MBlazeOperand *Op = new MBlazeOperand(Register);
 229     Op->Reg.RegNum = RegNum;
 230     Op->StartLoc = S;
 231     Op->EndLoc = E;
 232     return Op;
 233   }
 234
 235   static MBlazeOperand *CreateImm(const MCExpr *Val, SMLoc S, SMLoc E) {
 236     MBlazeOperand *Op = new MBlazeOperand(Immediate);
 237     Op->Imm.Val = Val;
 238     Op->StartLoc = S;
 239     Op->EndLoc = E;
 240     return Op;
 241   }
 242
 243   static MBlazeOperand *CreateFslImm(const MCExpr *Val, SMLoc S, SMLoc E) {
 244     MBlazeOperand *Op = new MBlazeOperand(Fsl);
 245     Op->Imm.Val = Val;
 246     Op->StartLoc = S;
 247     Op->EndLoc = E;
 248     return Op;
 249   }
 250
 251   static MBlazeOperand *CreateMem(unsigned Base, const MCExpr *Off, SMLoc S,
 252                                   SMLoc E) {
 253     MBlazeOperand *Op = new MBlazeOperand(Memory);
 254     Op->Mem.Base = Base;
 255     Op->Mem.Off = Off;
 256     Op->Mem.OffReg = 0;
 257     Op->StartLoc = S;
 258     Op->EndLoc = E;
 259     return Op;
 260   }
 261
 262   static MBlazeOperand *CreateMem(unsigned Base, unsigned Off, SMLoc S,
 263                                   SMLoc E) {
 264     MBlazeOperand *Op = new MBlazeOperand(Memory);
 265     Op->Mem.Base = Base;
 266     Op->Mem.OffReg = Off;
 267     Op->Mem.Off = 0;
 268     Op->StartLoc = S;
 269     Op->EndLoc = E;
 270     return Op;
 271   }
 272 };
 273
 274 } // end anonymous namespace.
 275
 276 void MBlazeOperand::print(raw_ostream &OS) const {
 277   switch (Kind) {
 278   case Immediate:
 279     getImm()->print(OS);
 280     break;
 281   case Register:
 282     OS << "<register R";
 283     OS << getMBlazeRegisterNumbering(getReg()) << ">";
 284     break;
 285   case Token:
 286     OS << "'" << getToken() << "'";
 287     break;
 288   case Memory: {
 289     OS << "<memory R";
 290     OS << getMBlazeRegisterNumbering(getMemBase());
 291     OS << ", ";
 292
 293     unsigned RegOff = getMemOffReg();
 294     if (RegOff)
 295       OS << "R" << getMBlazeRegisterNumbering(RegOff);
 296     else
 297       OS << getMemOff();
 298     OS << ">";
 299     }
 300     break;
 301   case Fsl:
 302     getFslImm()->print(OS);
 303     break;
 304   }
 305 }
 306
 307 /// @name Auto-generated Match Functions
 308 /// {
 309
 310 static unsigned MatchRegisterName(StringRef Name);
 311
 312 /// }
 313 //
 314 bool MBlazeAsmParser::
 315 MatchAndEmitInstruction(SMLoc IDLoc,
 316                         SmallVectorImpl<MCParsedAsmOperand*> &Operands,
 317                         MCStreamer &Out) {
 318   MCInst Inst;
 319   unsigned Kind;
 320   unsigned ErrorInfo;
 321
 322   switch (MatchInstructionImpl(Operands, Kind, Inst, ErrorInfo)) {
 323   default: break;
 324   case Match_Success:
 325     Out.EmitInstruction(Inst);
 326     return false;
 327   case Match_MissingFeature:
 328     return Error(IDLoc, "instruction use requires an option to be enabled");
 329   case Match_MnemonicFail:
 330       return Error(IDLoc, "unrecognized instruction mnemonic");
 331   case Match_InvalidOperand: {
 332     SMLoc ErrorLoc = IDLoc;
 333     if (ErrorInfo != ~0U) {
 334       if (ErrorInfo >= Operands.size())
 335         return Error(IDLoc, "too few operands for instruction");
 336
 337       ErrorLoc = ((MBlazeOperand*)Operands[ErrorInfo])->getStartLoc();
 338       if (ErrorLoc == SMLoc()) ErrorLoc = IDLoc;
 339     }
 340
 341     return Error(ErrorLoc, "invalid operand for instruction");
 342   }
 343   }
 344
 345   llvm_unreachable("Implement any new match types added!");
 346 }
 347
 348 MBlazeOperand *MBlazeAsmParser::
 349 ParseMemory(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
 350   if (Operands.size() != 4)
 351     return 0;
 352
 353   MBlazeOperand &Base = *(MBlazeOperand*)Operands[2];
 354   MBlazeOperand &Offset = *(MBlazeOperand*)Operands[3];
 355
 356   SMLoc S = Base.getStartLoc();
 357   SMLoc O = Offset.getStartLoc();
 358   SMLoc E = Offset.getEndLoc();
 359
 360   if (!Base.isReg()) {
 361     Error(S, "base address must be a register");
 362     return 0;
 363   }
 364
 365   if (!Offset.isReg() && !Offset.isImm()) {
 366     Error(O, "offset must be a register or immediate");
 367     return 0;
 368   }
 369
 370   MBlazeOperand *Op;
 371   if (Offset.isReg())
 372     Op = MBlazeOperand::CreateMem(Base.getReg(), Offset.getReg(), S, E);
 373   else
 374     Op = MBlazeOperand::CreateMem(Base.getReg(), Offset.getImm(), S, E);
 375
 376   delete Operands.pop_back_val();
 377   delete Operands.pop_back_val();
 378   Operands.push_back(Op);
 379
 380   return Op;
 381 }
 382
 383 bool MBlazeAsmParser::ParseRegister(unsigned &RegNo,
 384                                     SMLoc &StartLoc, SMLoc &EndLoc) {
 385   return (ParseRegister(RegNo) == 0);
 386 }
 387
 388 MBlazeOperand *MBlazeAsmParser::ParseRegister(unsigned &RegNo) {
 389   SMLoc S = Parser.getTok().getLoc();
 390   SMLoc E = SMLoc::getFromPointer(Parser.getTok().getLoc().getPointer() - 1);
 391
 392   switch (getLexer().getKind()) {
 393   default: return 0;
 394   case AsmToken::Identifier:
 395     RegNo = MatchRegisterName(getLexer().getTok().getIdentifier());
 396     if (RegNo == 0)
 397       return 0;
 398
 399     getLexer().Lex();
 400     return MBlazeOperand::CreateReg(RegNo, S, E);
 401   }
 402 }
 403
 404 static unsigned MatchFslRegister(StringRef String) {
 405   if (!String.startswith("rfsl"))
 406     return -1;
 407
 408   unsigned regNum;
 409   if (String.substr(4).getAsInteger(10,regNum))
 410     return -1;
 411
 412   return regNum;
 413 }
 414
 415 MBlazeOperand *MBlazeAsmParser::ParseFsl() {
 416   SMLoc S = Parser.getTok().getLoc();
 417   SMLoc E = SMLoc::getFromPointer(Parser.getTok().getLoc().getPointer() - 1);
 418
 419   switch (getLexer().getKind()) {
 420   default: return 0;
 421   case AsmToken::Identifier:
 422     unsigned reg = MatchFslRegister(getLexer().getTok().getIdentifier());
 423     if (reg >= 16)
 424       return 0;
 425
 426     getLexer().Lex();
 427     const MCExpr *EVal = MCConstantExpr::Create(reg,getContext());
 428     return MBlazeOperand::CreateFslImm(EVal,S,E);
 429   }
 430 }
 431
 432 MBlazeOperand *MBlazeAsmParser::ParseImmediate() {
 433   SMLoc S = Parser.getTok().getLoc();
 434   SMLoc E = SMLoc::getFromPointer(Parser.getTok().getLoc().getPointer() - 1);
 435
 436   const MCExpr *EVal;
 437   switch (getLexer().getKind()) {
 438   default: return 0;
 439   case AsmToken::LParen:
 440   case AsmToken::Plus:
 441   case AsmToken::Minus:
 442   case AsmToken::Integer:
 443   case AsmToken::Identifier:
 444     if (getParser().ParseExpression(EVal))
 445       return 0;
 446
 447     return MBlazeOperand::CreateImm(EVal, S, E);
 448   }
 449 }
 450
 451 MBlazeOperand *MBlazeAsmParser::
 452 ParseOperand(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
 453   MBlazeOperand *Op;
 454
 455   // Attempt to parse the next token as a register name
 456   unsigned RegNo;
 457   Op = ParseRegister(RegNo);
 458
 459   // Attempt to parse the next token as an FSL immediate
 460   if (!Op)
 461     Op = ParseFsl();
 462
 463   // Attempt to parse the next token as an immediate
 464   if (!Op)
 465     Op = ParseImmediate();
 466
 467   // If the token could not be parsed then fail
 468   if (!Op) {
 469     Error(Parser.getTok().getLoc(), "unknown operand");
 470     return 0;
 471   }
 472
 473   // Push the parsed operand into the list of operands
 474   Operands.push_back(Op);
 475   return Op;
 476 }
 477
 478 /// Parse an mblaze instruction mnemonic followed by its operands.
 479 bool MBlazeAsmParser::
 480 ParseInstruction(StringRef Name, SMLoc NameLoc,
 481                  SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
 482   // The first operands is the token for the instruction name
 483   size_t dotLoc = Name.find('.');
 484   Operands.push_back(MBlazeOperand::CreateToken(Name.substr(0,dotLoc),NameLoc));
 485   if (dotLoc < Name.size())
 486     Operands.push_back(MBlazeOperand::CreateToken(Name.substr(dotLoc),NameLoc));
 487
 488   // If there are no more operands then finish
 489   if (getLexer().is(AsmToken::EndOfStatement))
 490     return false;
 491
 492   // Parse the first operand
 493   if (!ParseOperand(Operands))
 494     return true;
 495
 496   while (getLexer().isNot(AsmToken::EndOfStatement) &&
 497          getLexer().is(AsmToken::Comma)) {
 498     // Consume the comma token
 499     getLexer().Lex();
 500
 501     // Parse the next operand
 502     if (!ParseOperand(Operands))
 503       return true;
 504   }
 505
 506   // If the instruction requires a memory operand then we need to
 507   // replace the last two operands (base+offset) with a single
 508   // memory operand.
 509   if (Name.startswith("lw") || Name.startswith("sw") ||
 510       Name.startswith("lh") || Name.startswith("sh") ||
 511       Name.startswith("lb") || Name.startswith("sb"))
 512     return (ParseMemory(Operands) == NULL);
 513
 514   return false;
 515 }
 516
 517 /// ParseDirective parses the MBlaze specific directives
 518 bool MBlazeAsmParser::ParseDirective(AsmToken DirectiveID) {
 519   StringRef IDVal = DirectiveID.getIdentifier();
 520   if (IDVal == ".word")
 521     return ParseDirectiveWord(2, DirectiveID.getLoc());
 522   return true;
 523 }
 524
 525 /// ParseDirectiveWord
 526 ///  ::= .word [ expression (, expression)* ]
 527 bool MBlazeAsmParser::ParseDirectiveWord(unsigned Size, SMLoc L) {
 528   if (getLexer().isNot(AsmToken::EndOfStatement)) {
 529     for (;;) {
 530       const MCExpr *Value;
 531       if (getParser().ParseExpression(Value))
 532         return true;
 533
 534       getParser().getStreamer().EmitValue(Value, Size, 0 /*addrspace*/);
 535
 536       if (getLexer().is(AsmToken::EndOfStatement))
 537         break;
 538
 539       // FIXME: Improve diagnostic.
 540       if (getLexer().isNot(AsmToken::Comma))
 541         return Error(L, "unexpected token in directive");
 542       Parser.Lex();
 543     }
 544   }
 545
 546   Parser.Lex();
 547   return false;
 548 }
 549
 550 extern "C" void LLVMInitializeMBlazeAsmLexer();
 551
 552 /// Force static initialization.
 553 extern "C" void LLVMInitializeMBlazeAsmParser() {
 554   RegisterMCAsmParser<MBlazeAsmParser> X(TheMBlazeTarget);
 555   LLVMInitializeMBlazeAsmLexer();
 556 }
 557
 558 #define GET_REGISTER_MATCHER
 559 #define GET_MATCHER_IMPLEMENTATION
 560 #include "MBlazeGenAsmMatcher.inc"