llvm-project/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp

//===-- MipsAsmParser.cpp - Parse Mips assembly to MCInst instructions ----===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "MCTargetDesc/MipsMCTargetDesc.h"
#include "llvm/MC/MCParser/MCAsmLexer.h"
#include "llvm/MC/MCTargetAsmParser.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
#include "llvm/MC/MCTargetAsmParser.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/Support/MathExtras.h"

using namespace llvm;

namespace {
class MipsAsmParser : public MCTargetAsmParser {

#define GET_ASSEMBLER_HEADER
#include "MipsGenAsmMatcher.inc"

  bool MatchAndEmitInstruction(SMLoc IDLoc,
                               SmallVectorImpl<MCParsedAsmOperand*> &Operands,
                               MCStreamer &Out);

  bool ParseRegister(unsigned &RegNo, SMLoc &StartLoc, SMLoc &EndLoc);

  bool ParseInstruction(StringRef Name, SMLoc NameLoc,
                        SmallVectorImpl<MCParsedAsmOperand*> &Operands);

  bool ParseDirective(AsmToken DirectiveID);

  OperandMatchResultTy parseMemOperand(SmallVectorImpl<MCParsedAsmOperand*>&);

  unsigned getMCInstOperandNum(unsigned Kind, MCInst &Inst,
                    const SmallVectorImpl<MCParsedAsmOperand*> &Operands,
                               unsigned OperandNum, unsigned &NumMCOperands);

public:
  MipsAsmParser(MCSubtargetInfo &sti, MCAsmParser &parser)
    : MCTargetAsmParser() {
  }

};
}

namespace {

/// MipsOperand - Instances of this class represent a parsed Mips machine
/// instruction.
class MipsOperand : public MCParsedAsmOperand {
  enum KindTy {
    k_CondCode,
    k_CoprocNum,
    k_Immediate,
    k_Memory,
    k_PostIndexRegister,
    k_Register,
    k_Token
  } Kind;

  MipsOperand(KindTy K) : MCParsedAsmOperand(), Kind(K) {}
public:
  void addRegOperands(MCInst &Inst, unsigned N) const {
    llvm_unreachable("unimplemented!");
  }
  void addExpr(MCInst &Inst, const MCExpr *Expr) const{
    llvm_unreachable("unimplemented!");
  }
  void addImmOperands(MCInst &Inst, unsigned N) const {
    llvm_unreachable("unimplemented!");
  }
  void addMemOperands(MCInst &Inst, unsigned N) const {
    llvm_unreachable("unimplemented!");
  }

  bool isReg() const { return Kind == k_Register; }
  bool isImm() const { return Kind == k_Immediate; }
  bool isToken() const { return Kind == k_Token; }
  bool isMem() const { return Kind == k_Memory; }

  StringRef getToken() const {
    assert(Kind == k_Token && "Invalid access!");
    return "";
  }

  unsigned getReg() const {
    assert((Kind == k_Register) && "Invalid access!");
    return 0;
  }

  virtual void print(raw_ostream &OS) const {
    llvm_unreachable("unimplemented!");
  }
};
}

unsigned MipsAsmParser::
getMCInstOperandNum(unsigned Kind, MCInst &Inst,
                    const SmallVectorImpl<MCParsedAsmOperand*> &Operands,
                    unsigned OperandNum, unsigned &NumMCOperands) {
  assert (0 && "getMCInstOperandNum() not supported by the Mips target.");
  // The Mips backend doesn't currently include the matcher implementation, so
  // the getMCInstOperandNumImpl() is undefined.  This is a temporary
  // work around.
  NumMCOperands = 0;
  return 0;
}

bool MipsAsmParser::
MatchAndEmitInstruction(SMLoc IDLoc,
                        SmallVectorImpl<MCParsedAsmOperand*> &Operands,
                        MCStreamer &Out) {
  return true;
}

bool MipsAsmParser::
ParseRegister(unsigned &RegNo, SMLoc &StartLoc, SMLoc &EndLoc) {
  return true;
}

bool MipsAsmParser::
ParseInstruction(StringRef Name, SMLoc NameLoc,
                 SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
  return true;
}

bool MipsAsmParser::
ParseDirective(AsmToken DirectiveID) {
  return true;
}

MipsAsmParser::OperandMatchResultTy MipsAsmParser::
  parseMemOperand(SmallVectorImpl<MCParsedAsmOperand*>&) {
  return MatchOperand_ParseFail;
}

extern "C" void LLVMInitializeMipsAsmParser() {
  RegisterMCAsmParser<MipsAsmParser> X(TheMipsTarget);
  RegisterMCAsmParser<MipsAsmParser> Y(TheMipselTarget);
  RegisterMCAsmParser<MipsAsmParser> A(TheMips64Target);
  RegisterMCAsmParser<MipsAsmParser> B(TheMips64elTarget);
}