[TableGen] Move OperandMatchResultTy enum to MCTargetAsmParser.h

[asb]

Summary

As it stands, the OperandMatchResultTy is only included in the generated header if there is custom operand parsing. However, almost all backends make use of MatchOperand_Success and friends from OperandMatchResultTy for e.g. parseRegister. This is a pain when starting an AsmParser for a new backend that doesn't yet have custom operand parsing. Move the enum to MCTargetAsmParser.h.

This patch is a prerequisite for D23563

[jyknight]

I'd suggest that it be moved into class MCTargetAsmParser in include/llvm/MC/MCParser/MCTargetAsmParser.h, as that's the superclass of the types which currently have it via this tablegen'd code.

[asb]

Rather than the hacky previous approach (unconditionally emittingthe enum), move it to a header.

[asb]

The last update of this patch was incomplete. Now fixed.

include/llvm/MC/MCParser/MCTargetAsmParser.h

struct ParseInstructionInfo {
 
   SmallVectorImpl<AsmRewrite> *AsmRewrites;
 
   ParseInstructionInfo() : AsmRewrites(nullptr) {}
   ParseInstructionInfo(SmallVectorImpl<AsmRewrite> *rewrites)
     : AsmRewrites(rewrites) {}
 };
 
+enum OperandMatchResultTy {
+  MatchOperand_Success,  // operand matched successfully
+  MatchOperand_NoMatch,  // operand did not match
+  MatchOperand_ParseFail // operand matched but had errors
+};
+
 /// MCTargetAsmParser - Generic interface to target specific assembly parsers.
 class MCTargetAsmParser : public MCAsmParserExtension {
 public:
   enum MatchResultTy {
     Match_InvalidOperand,
     Match_MissingFeature,
     Match_MnemonicFail,
     Match_Success,

lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp

int AArch64AsmParser::tryMatchVectorRegister(StringRef &Kind, bool expected) {
   }
 
   if (expected)
     TokError("vector register expected");
   return -1;
 }
 
 /// tryParseSysCROperand - Try to parse a system instruction CR operand name.
-AArch64AsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AArch64AsmParser::tryParseSysCROperand(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = getLoc();
 
   if (Parser.getTok().isNot(AsmToken::Identifier)) {
     Error(S, "Expected cN operand where 0 <= N <= 15");
     return MatchOperand_ParseFail;
   }
AArch64AsmParser::tryParseSysCROperand(OperandVector &Operands) {
 
   Parser.Lex(); // Eat identifier token.
   Operands.push_back(
       AArch64Operand::CreateSysCR(CRNum, S, getLoc(), getContext()));
   return MatchOperand_Success;
 }
 
 /// tryParsePrefetch - Try to parse a prefetch operand.
-AArch64AsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AArch64AsmParser::tryParsePrefetch(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = getLoc();
   const AsmToken &Tok = Parser.getTok();
   // Either an identifier for named values or a 5-bit immediate.
   bool Hash = Tok.is(AsmToken::Hash);
   if (Hash || Tok.is(AsmToken::Integer)) {
     if (Hash)
AArch64AsmParser::tryParsePrefetch(OperandVector &Operands) {
 
   Parser.Lex(); // Eat identifier token.
   Operands.push_back(AArch64Operand::CreatePrefetch(
       PRFM->Encoding, Tok.getString(), S, getContext()));
   return MatchOperand_Success;
 }
 
 /// tryParsePSBHint - Try to parse a PSB operand, mapped to Hint command
-AArch64AsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AArch64AsmParser::tryParsePSBHint(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = getLoc();
   const AsmToken &Tok = Parser.getTok();
   if (Tok.isNot(AsmToken::Identifier)) {
     TokError("invalid operand for instruction");
     return MatchOperand_ParseFail;
   }
 
   auto PSB = AArch64PSBHint::lookupPSBByName(Tok.getString());
   if (!PSB) {
     TokError("invalid operand for instruction");
     return MatchOperand_ParseFail;
   }
 
   Parser.Lex(); // Eat identifier token.
   Operands.push_back(AArch64Operand::CreatePSBHint(
       PSB->Encoding, Tok.getString(), S, getContext()));
   return MatchOperand_Success;
 }
 
 /// tryParseAdrpLabel - Parse and validate a source label for the ADRP
 /// instruction.
-AArch64AsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AArch64AsmParser::tryParseAdrpLabel(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = getLoc();
   const MCExpr *Expr;
 
   if (Parser.getTok().is(AsmToken::Hash)) {
     Parser.Lex(); // Eat hash token.
   }
AArch64AsmParser::tryParseAdrpLabel(OperandVector &Operands) {
   SMLoc E = SMLoc::getFromPointer(getLoc().getPointer() - 1);
   Operands.push_back(AArch64Operand::CreateImm(Expr, S, E, getContext()));
 
   return MatchOperand_Success;
 }
 
 /// tryParseAdrLabel - Parse and validate a source label for the ADR
 /// instruction.
-AArch64AsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AArch64AsmParser::tryParseAdrLabel(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = getLoc();
   const MCExpr *Expr;
 
   if (Parser.getTok().is(AsmToken::Hash)) {
     Parser.Lex(); // Eat hash token.
   }
 
   if (getParser().parseExpression(Expr))
     return MatchOperand_ParseFail;
 
   SMLoc E = SMLoc::getFromPointer(getLoc().getPointer() - 1);
   Operands.push_back(AArch64Operand::CreateImm(Expr, S, E, getContext()));
 
   return MatchOperand_Success;
 }
 
 /// tryParseFPImm - A floating point immediate expression operand.
-AArch64AsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AArch64AsmParser::tryParseFPImm(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = getLoc();
 
   bool Hash = false;
   if (Parser.getTok().is(AsmToken::Hash)) {
     Parser.Lex(); // Eat '#'
     Hash = true;
AArch64AsmParser::tryParseFPImm(OperandVector &Operands) {
   if (!Hash)
     return MatchOperand_NoMatch;
 
   TokError("invalid floating point immediate");
   return MatchOperand_ParseFail;
 }
 
 /// tryParseAddSubImm - Parse ADD/SUB shifted immediate operand
-AArch64AsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AArch64AsmParser::tryParseAddSubImm(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = getLoc();
 
   if (Parser.getTok().is(AsmToken::Hash))
     Parser.Lex(); // Eat '#'
   else if (Parser.getTok().isNot(AsmToken::Integer))
     // Operand should start from # or should be integer, emit error otherwise.
bool AArch64AsmParser::parseCondCode(OperandVector &Operands,
 
   Operands.push_back(
       AArch64Operand::CreateCondCode(CC, S, getLoc(), getContext()));
   return false;
 }
 
 /// tryParseOptionalShift - Some operands take an optional shift argument. Parse
 /// them if present.
-AArch64AsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AArch64AsmParser::tryParseOptionalShiftExtend(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   const AsmToken &Tok = Parser.getTok();
   std::string LowerID = Tok.getString().lower();
   AArch64_AM::ShiftExtendType ShOp =
       StringSwitch<AArch64_AM::ShiftExtendType>(LowerID)
           .Case("lsl", AArch64_AM::LSL)
           .Case("lsr", AArch64_AM::LSR)
#undef SYS_ALIAS
   else if (!ExpectRegister && HasRegister) {
     return TokError("specified " + Mnemonic + " op does not use a register");
   }
 
   Parser.Lex(); // Consume the EndOfStatement
   return false;
 }
 
-AArch64AsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AArch64AsmParser::tryParseBarrierOperand(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   const AsmToken &Tok = Parser.getTok();
 
   // Can be either a #imm style literal or an option name
   bool Hash = Tok.is(AsmToken::Hash);
   if (Hash || Tok.is(AsmToken::Integer)) {
     // Immediate operand.
AArch64AsmParser::tryParseBarrierOperand(OperandVector &Operands) {
 
   Operands.push_back(AArch64Operand::CreateBarrier(
       DB->Encoding, Tok.getString(), getLoc(), getContext()));
   Parser.Lex(); // Consume the option
 
   return MatchOperand_Success;
 }
 
-AArch64AsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AArch64AsmParser::tryParseSysReg(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   const AsmToken &Tok = Parser.getTok();
 
   if (Tok.isNot(AsmToken::Identifier))
     return MatchOperand_NoMatch;
 
   int MRSReg, MSRReg;
if (Parser.getTok().is(AsmToken::LBrac)) {
     Parser.Lex(); // Eat right bracket token.
 
     Operands.push_back(AArch64Operand::CreateVectorIndex(MCE->getValue(), SIdx,
                                                          E, getContext()));
   }
   return false;
 }
 
-AArch64AsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AArch64AsmParser::tryParseGPR64sp0Operand(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   const AsmToken &Tok = Parser.getTok();
   if (!Tok.is(AsmToken::Identifier))
     return MatchOperand_NoMatch;
 
   unsigned RegNum = matchRegisterNameAlias(Tok.getString().lower(), false);
 
unsigned AArch64AsmParser::validateTargetOperandClass(MCParsedAsmOperand &AsmOp,
   if (!CE)
     return Match_InvalidOperand;
   if (CE->getValue() == ExpectedVal)
     return Match_Success;
   return Match_InvalidOperand;
 }
 
 
-AArch64AsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AArch64AsmParser::tryParseGPRSeqPair(OperandVector &Operands) {
 
   SMLoc S = getLoc();
 
   if (getParser().getTok().isNot(AsmToken::Identifier)) {
     Error(S, "expected register");
     return MatchOperand_ParseFail;
   }

lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp

std::unique_ptr<AMDGPUOperand> AMDGPUAsmParser::parseRegister() {
   unsigned Reg, RegNum, RegWidth;
 
   if (!ParseAMDGPURegister(RegKind, Reg, RegNum, RegWidth)) {
     return nullptr;
   }
   return AMDGPUOperand::CreateReg(this, Reg, StartLoc, EndLoc, false);
 }
 
-AMDGPUAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AMDGPUAsmParser::parseImm(OperandVector &Operands) {
   // TODO: add syntactic sugar for 1/(2*PI)
   bool Minus = false;
   if (getLexer().getKind() == AsmToken::Minus) {
     Minus = true;
     Parser.Lex();
   }
 
Operands.push_back(
                                  AMDGPUOperand::ImmTyNone, true));
     return MatchOperand_Success;
   }
   default:
     return Minus ? MatchOperand_ParseFail : MatchOperand_NoMatch;
   }
 }
 
-AMDGPUAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AMDGPUAsmParser::parseRegOrImm(OperandVector &Operands) {
   auto res = parseImm(Operands);
   if (res != MatchOperand_NoMatch) {
     return res;
   }
 
   if (auto R = parseRegister()) {
     assert(R->isReg());
     R->Reg.IsForcedVOP3 = isForcedVOP3();
     Operands.push_back(std::move(R));
     return MatchOperand_Success;
   }
   return MatchOperand_ParseFail;
 }
 
-AMDGPUAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AMDGPUAsmParser::parseRegOrImmWithFPInputMods(OperandVector &Operands) {
   // XXX: During parsing we can't determine if minus sign means
   // negate-modifier or negative immediate value.
   // By default we suppose it is modifier.
   bool Negate = false, Abs = false, Abs2 = false;
 
   if (getLexer().getKind()== AsmToken::Minus) {
     Parser.Lex();
AMDGPUAsmParser::parseRegOrImmWithFPInputMods(OperandVector &Operands) {
 
   if (Mods.hasFPModifiers()) {
     AMDGPUOperand &Op = static_cast<AMDGPUOperand &>(*Operands.back());
     Op.setModifiers(Mods);
   }
   return MatchOperand_Success;
 }
 
-AMDGPUAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AMDGPUAsmParser::parseRegOrImmWithIntInputMods(OperandVector &Operands) {
   bool Sext = false;
 
   if (getLexer().getKind() == AsmToken::Identifier && Parser.getTok().getString() == "sext") {
     Parser.Lex();
     Sext = true;
     if (getLexer().isNot(AsmToken::LParen)) {
       Error(Parser.getTok().getLoc(), "expected left paren after sext");
for (MCRegAliasIterator R(AMDGPU::SGPR102_SGPR103, &MRI, true);
        R.isValid(); ++R) {
     if (*R == RegNo)
       return false;
   }
 
   return true;
 }
 
-AMDGPUAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AMDGPUAsmParser::parseOperand(OperandVector &Operands, StringRef Mnemonic) {
 
   // Try to parse with a custom parser
   OperandMatchResultTy ResTy = MatchOperandParserImpl(Operands, Mnemonic);
 
   // If we successfully parsed the operand or if there as an error parsing,
   // we are done.
   //

 bool AMDGPUAsmParser::ParseInstruction(ParseInstructionInfo &Info,
                                        StringRef Name,
                                        SMLoc NameLoc, OperandVector &Operands) {
   // Add the instruction mnemonic
   Name = parseMnemonicSuffix(Name);
   Operands.push_back(AMDGPUOperand::CreateToken(this, Name, NameLoc));
 
   while (!getLexer().is(AsmToken::EndOfStatement)) {
-    AMDGPUAsmParser::OperandMatchResultTy Res = parseOperand(Operands, Name);
+    OperandMatchResultTy Res = parseOperand(Operands, Name);
 
     // Eat the comma or space if there is one.
     if (getLexer().is(AsmToken::Comma))
       Parser.Lex();
 
     switch (Res) {
       case MatchOperand_Success: break;
       case MatchOperand_ParseFail:
bool AMDGPUAsmParser::ParseInstruction(ParseInstructionInfo &Info,
 
   return false;
 }
 
 //===----------------------------------------------------------------------===//
 // Utility functions
 //===----------------------------------------------------------------------===//
 
-AMDGPUAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AMDGPUAsmParser::parseIntWithPrefix(const char *Prefix, int64_t &Int) {
   switch(getLexer().getKind()) {
     default: return MatchOperand_NoMatch;
     case AsmToken::Identifier: {
       StringRef Name = Parser.getTok().getString();
       if (!Name.equals(Prefix)) {
         return MatchOperand_NoMatch;
       }
case AsmToken::Identifier: {
       if (getParser().parseAbsoluteExpression(Int))
         return MatchOperand_ParseFail;
       break;
     }
   }
   return MatchOperand_Success;
 }
 
-AMDGPUAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AMDGPUAsmParser::parseIntWithPrefix(const char *Prefix, OperandVector &Operands,
                                     enum AMDGPUOperand::ImmTy ImmTy,
                                     bool (*ConvertResult)(int64_t&)) {
 
   SMLoc S = Parser.getTok().getLoc();
   int64_t Value = 0;
 
-  AMDGPUAsmParser::OperandMatchResultTy Res = parseIntWithPrefix(Prefix, Value);
+  OperandMatchResultTy Res = parseIntWithPrefix(Prefix, Value);
   if (Res != MatchOperand_Success)
     return Res;
 
   if (ConvertResult && !ConvertResult(Value)) {
     return MatchOperand_ParseFail;
   }
 
   Operands.push_back(AMDGPUOperand::CreateImm(this, Value, S, ImmTy));
   return MatchOperand_Success;
 }
 
-AMDGPUAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AMDGPUAsmParser::parseNamedBit(const char *Name, OperandVector &Operands,
                                enum AMDGPUOperand::ImmTy ImmTy) {
   int64_t Bit = 0;
   SMLoc S = Parser.getTok().getLoc();
 
   // We are at the end of the statement, and this is a default argument, so
   // use a default value.
   if (getLexer().isNot(AsmToken::EndOfStatement)) {
void addOptionalImmOperand(MCInst& Inst, const OperandVector& Operands,
   if (i != OptionalIdx.end()) {
     unsigned Idx = i->second;
     ((AMDGPUOperand &)*Operands[Idx]).addImmOperands(Inst, 1);
   } else {
     Inst.addOperand(MCOperand::createImm(Default));
   }
 }
 
-AMDGPUAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AMDGPUAsmParser::parseStringWithPrefix(StringRef Prefix, StringRef &Value) {
   if (getLexer().isNot(AsmToken::Identifier)) {
     return MatchOperand_NoMatch;
   }
   StringRef Tok = Parser.getTok().getString();
   if (Tok != Prefix) {
     return MatchOperand_NoMatch;
   }
if (CntName == "vmcnt") {
     return true;
   }
 
   IntVal &= ~(CntMask << CntShift);
   IntVal |= (CntVal << CntShift);
   return false;
 }
 
-AMDGPUAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AMDGPUAsmParser::parseSWaitCntOps(OperandVector &Operands) {
   // Disable all counters by default.
   // vmcnt   [3:0]
   // expcnt  [6:4]
   // lgkmcnt [11:8]
   int64_t CntVal = 0xf7f;
   SMLoc S = Parser.getTok().getLoc();
 
bool AMDGPUAsmParser::parseHwregConstruct(OperandInfoTy &HwReg, int64_t &Offset, int64_t &Width) {
 
   if (getLexer().isNot(AsmToken::RParen))
     return true;
   Parser.Lex();
 
   return false;
 }
 
-AMDGPUAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AMDGPUAsmParser::parseHwreg(OperandVector &Operands) {
   using namespace llvm::AMDGPU::Hwreg;
 
   int64_t Imm16Val = 0;
   SMLoc S = Parser.getTok().getLoc();
 
   switch(getLexer().getKind()) {
     default: return MatchOperand_NoMatch;
bool AMDGPUAsmParser::parseSendMsgConstruct(OperandInfoTy &Msg, OperandInfoTy &Operation, int64_t &StreamId) {
   }
 
   if (getLexer().isNot(AsmToken::RParen))
     return true;
   Parser.Lex();
   return false;
 }
 
-AMDGPUAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AMDGPUAsmParser::parseSendMsgOp(OperandVector &Operands) {
   using namespace llvm::AMDGPU::SendMsg;
 
   int64_t Imm16Val = 0;
   SMLoc S = Parser.getTok().getLoc();
 
   switch(getLexer().getKind()) {
   default:

 bool AMDGPUOperand::isSendMsg() const {
   return isImmTy(ImmTySendMsg);
 }
 
 //===----------------------------------------------------------------------===//
 // sopp branch targets
 //===----------------------------------------------------------------------===//
 
-AMDGPUAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AMDGPUAsmParser::parseSOppBrTarget(OperandVector &Operands) {
   SMLoc S = Parser.getTok().getLoc();
 
   switch (getLexer().getKind()) {
     default: return MatchOperand_ParseFail;
     case AsmToken::Integer: {
       int64_t Imm;
       if (getParser().parseAbsoluteExpression(Imm))
static const OptionalOperand AMDGPUOptionalOperandTable[] = {
   {"bank_mask",  AMDGPUOperand::ImmTyDppBankMask, false, nullptr},
   {"bound_ctrl", AMDGPUOperand::ImmTyDppBoundCtrl, false, ConvertBoundCtrl},
   {"dst_sel",    AMDGPUOperand::ImmTySdwaDstSel, false, nullptr},
   {"src0_sel",   AMDGPUOperand::ImmTySdwaSrc0Sel, false, nullptr},
   {"src1_sel",   AMDGPUOperand::ImmTySdwaSrc1Sel, false, nullptr},
   {"dst_unused", AMDGPUOperand::ImmTySdwaDstUnused, false, nullptr},
 };
 
-AMDGPUAsmParser::OperandMatchResultTy AMDGPUAsmParser::parseOptionalOperand(OperandVector &Operands) {
+OperandMatchResultTy AMDGPUAsmParser::parseOptionalOperand(OperandVector &Operands) {
   OperandMatchResultTy res;
   for (const OptionalOperand &Op : AMDGPUOptionalOperandTable) {
     // try to parse any optional operand here
     if (Op.IsBit) {
       res = parseNamedBit(Op.Name, Operands, Op.Type);
     } else if (Op.Type == AMDGPUOperand::ImmTyOModSI) {
       res = parseOModOperand(Operands);
     } else if (Op.Type == AMDGPUOperand::ImmTySdwaDstSel ||
                Op.Type == AMDGPUOperand::ImmTySdwaSrc0Sel ||
                Op.Type == AMDGPUOperand::ImmTySdwaSrc1Sel) {
       res = parseSDWASel(Operands, Op.Name, Op.Type);
     } else if (Op.Type == AMDGPUOperand::ImmTySdwaDstUnused) {
       res = parseSDWADstUnused(Operands);
     } else {
       res = parseIntWithPrefix(Op.Name, Operands, Op.Type, Op.ConvertResult);
     }
     if (res != MatchOperand_NoMatch) {
       return res;
     }
   }
   return MatchOperand_NoMatch;
 }
 
-AMDGPUAsmParser::OperandMatchResultTy AMDGPUAsmParser::parseOModOperand(OperandVector &Operands)
+OperandMatchResultTy AMDGPUAsmParser::parseOModOperand(OperandVector &Operands)
 {
   StringRef Name = Parser.getTok().getString();
   if (Name == "mul") {
     return parseIntWithPrefix("mul", Operands, AMDGPUOperand::ImmTyOModSI, ConvertOmodMul);
   } else if (Name == "div") {
     return parseIntWithPrefix("div", Operands, AMDGPUOperand::ImmTyOModSI, ConvertOmodDiv);
   } else {
     return MatchOperand_NoMatch;
return ((Imm >= 0x000) && (Imm <= 0x0ff)) ||
            (Imm == 0x140) ||
            (Imm == 0x141) ||
            (Imm == 0x142) ||
            (Imm == 0x143);
   }
   return false;
 }
 
-AMDGPUAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AMDGPUAsmParser::parseDPPCtrl(OperandVector &Operands) {
   SMLoc S = Parser.getTok().getLoc();
   StringRef Prefix;
   int64_t Int;
 
   if (getLexer().getKind() == AsmToken::Identifier) {
     Prefix = Parser.getTok().getString();
   } else {
if (Inst.getOpcode() == AMDGPU::V_MAC_F32_dpp) {
     Inst.insert(it, Inst.getOperand(0)); // src2 = dst
   }
 }
 
 //===----------------------------------------------------------------------===//
 // sdwa
 //===----------------------------------------------------------------------===//
 
-AMDGPUAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AMDGPUAsmParser::parseSDWASel(OperandVector &Operands, StringRef Prefix,
                               AMDGPUOperand::ImmTy Type) {
   using namespace llvm::AMDGPU::SDWA;
 
   SMLoc S = Parser.getTok().getLoc();
   StringRef Value;
-  AMDGPUAsmParser::OperandMatchResultTy res;
+  OperandMatchResultTy res;
 
   res = parseStringWithPrefix(Prefix, Value);
   if (res != MatchOperand_Success) {
     return res;
   }
 
   int64_t Int;
   Int = StringSwitch<int64_t>(Value)
AMDGPUAsmParser::parseSDWASel(OperandVector &Operands, StringRef Prefix,
   if (Int == 0xffffffff) {
     return MatchOperand_ParseFail;
   }
 
   Operands.push_back(AMDGPUOperand::CreateImm(this, Int, S, Type));
   return MatchOperand_Success;
 }
 
-AMDGPUAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AMDGPUAsmParser::parseSDWADstUnused(OperandVector &Operands) {
   using namespace llvm::AMDGPU::SDWA;
 
   SMLoc S = Parser.getTok().getLoc();
   StringRef Value;
-  AMDGPUAsmParser::OperandMatchResultTy res;
+  OperandMatchResultTy res;
 
   res = parseStringWithPrefix("dst_unused", Value);
   if (res != MatchOperand_Success) {
     return res;
   }
 
   int64_t Int;
   Int = StringSwitch<int64_t>(Value)

lib/Target/ARM/AsmParser/ARMAsmParser.cpp

case 2:
     case '3': return 13;
     case '4': return 14;
     case '5': return 15;
     }
   }
 }
 
 /// parseITCondCode - Try to parse a condition code for an IT instruction.
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parseITCondCode(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = Parser.getTok().getLoc();
   const AsmToken &Tok = Parser.getTok();
   if (!Tok.is(AsmToken::Identifier))
     return MatchOperand_NoMatch;
   unsigned CC = StringSwitch<unsigned>(Tok.getString().lower())
     .Case("eq", ARMCC::EQ)
ARMAsmParser::parseITCondCode(OperandVector &Operands) {
   Operands.push_back(ARMOperand::CreateCondCode(ARMCC::CondCodes(CC), S));
 
   return MatchOperand_Success;
 }
 
 /// parseCoprocNumOperand - Try to parse an coprocessor number operand. The
 /// token must be an Identifier when called, and if it is a coprocessor
 /// number, the token is eaten and the operand is added to the operand list.
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parseCoprocNumOperand(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = Parser.getTok().getLoc();
   const AsmToken &Tok = Parser.getTok();
   if (Tok.isNot(AsmToken::Identifier))
     return MatchOperand_NoMatch;
 
   int Num = MatchCoprocessorOperandName(Tok.getString(), 'p');
   if (Num == -1)
     return MatchOperand_NoMatch;
   // ARMv7 and v8 don't allow cp10/cp11 due to VFP/NEON specific instructions
   if ((hasV7Ops() || hasV8Ops()) && (Num == 10 || Num == 11))
     return MatchOperand_NoMatch;
 
   Parser.Lex(); // Eat identifier token.
   Operands.push_back(ARMOperand::CreateCoprocNum(Num, S));
   return MatchOperand_Success;
 }
 
 /// parseCoprocRegOperand - Try to parse an coprocessor register operand. The
 /// token must be an Identifier when called, and if it is a coprocessor
 /// number, the token is eaten and the operand is added to the operand list.
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parseCoprocRegOperand(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = Parser.getTok().getLoc();
   const AsmToken &Tok = Parser.getTok();
   if (Tok.isNot(AsmToken::Identifier))
     return MatchOperand_NoMatch;
 
   int Reg = MatchCoprocessorOperandName(Tok.getString(), 'c');
   if (Reg == -1)
     return MatchOperand_NoMatch;
 
   Parser.Lex(); // Eat identifier token.
   Operands.push_back(ARMOperand::CreateCoprocReg(Reg, S));
   return MatchOperand_Success;
 }
 
 /// parseCoprocOptionOperand - Try to parse an coprocessor option operand.
 /// coproc_option : '{' imm0_255 '}'
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parseCoprocOptionOperand(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = Parser.getTok().getLoc();
 
   // If this isn't a '{', this isn't a coprocessor immediate operand.
   if (Parser.getTok().isNot(AsmToken::LCurly))
     return MatchOperand_NoMatch;
   Parser.Lex(); // Eat the '{'
if (Parser.getTok().is(AsmToken::Caret)) {
     Operands.push_back(ARMOperand::CreateToken("^",Parser.getTok().getLoc()));
     Parser.Lex(); // Eat '^' token.
   }
 
   return false;
 }
 
 // Helper function to parse the lane index for vector lists.
-ARMAsmParser::OperandMatchResultTy ARMAsmParser::
+OperandMatchResultTy ARMAsmParser::
 parseVectorLane(VectorLaneTy &LaneKind, unsigned &Index, SMLoc &EndLoc) {
   MCAsmParser &Parser = getParser();
   Index = 0; // Always return a defined index value.
   if (Parser.getTok().is(AsmToken::LBrac)) {
     Parser.Lex(); // Eat the '['.
     if (Parser.getTok().is(AsmToken::RBrac)) {
       // "Dn[]" is the 'all lanes' syntax.
       LaneKind = AllLanes;
if (Parser.getTok().is(AsmToken::LBrac)) {
     LaneKind = IndexedLane;
     return MatchOperand_Success;
   }
   LaneKind = NoLanes;
   return MatchOperand_Success;
 }
 
 // parse a vector register list
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parseVectorList(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   VectorLaneTy LaneKind;
   unsigned LaneIndex;
   SMLoc S = Parser.getTok().getLoc();
   // As an extension (to match gas), support a plain D register or Q register
   // (without encosing curly braces) as a single or double entry list,
   // respectively.
Operands.push_back(ARMOperand::CreateVectorListIndexed(FirstReg, Count,
                                                            (Spacing == 2),
                                                            S, E));
     break;
   }
   return MatchOperand_Success;
 }
 
 /// parseMemBarrierOptOperand - Try to parse DSB/DMB data barrier options.
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parseMemBarrierOptOperand(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = Parser.getTok().getLoc();
   const AsmToken &Tok = Parser.getTok();
   unsigned Opt;
 
   if (Tok.is(AsmToken::Identifier)) {
     StringRef OptStr = Tok.getString();
ARMAsmParser::parseMemBarrierOptOperand(OperandVector &Operands) {
   } else
     return MatchOperand_ParseFail;
 
   Operands.push_back(ARMOperand::CreateMemBarrierOpt((ARM_MB::MemBOpt)Opt, S));
   return MatchOperand_Success;
 }
 
 /// parseInstSyncBarrierOptOperand - Try to parse ISB inst sync barrier options.
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parseInstSyncBarrierOptOperand(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = Parser.getTok().getLoc();
   const AsmToken &Tok = Parser.getTok();
   unsigned Opt;
 
   if (Tok.is(AsmToken::Identifier)) {
     StringRef OptStr = Tok.getString();
ARMAsmParser::parseInstSyncBarrierOptOperand(OperandVector &Operands) {
 
   Operands.push_back(ARMOperand::CreateInstSyncBarrierOpt(
           (ARM_ISB::InstSyncBOpt)Opt, S));
   return MatchOperand_Success;
 }
 
 
 /// parseProcIFlagsOperand - Try to parse iflags from CPS instruction.
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parseProcIFlagsOperand(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = Parser.getTok().getLoc();
   const AsmToken &Tok = Parser.getTok();
   if (!Tok.is(AsmToken::Identifier)) 
     return MatchOperand_NoMatch;
   StringRef IFlagsStr = Tok.getString();
 
ARMAsmParser::parseProcIFlagsOperand(OperandVector &Operands) {
   }
 
   Parser.Lex(); // Eat identifier token.
   Operands.push_back(ARMOperand::CreateProcIFlags((ARM_PROC::IFlags)IFlags, S));
   return MatchOperand_Success;
 }
 
 /// parseMSRMaskOperand - Try to parse mask flags from MSR instruction.
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parseMSRMaskOperand(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = Parser.getTok().getLoc();
   const AsmToken &Tok = Parser.getTok();
   if (!Tok.is(AsmToken::Identifier))
     return MatchOperand_NoMatch;
   StringRef Mask = Tok.getString();
 
ARMAsmParser::parseMSRMaskOperand(OperandVector &Operands) {
 
   Parser.Lex(); // Eat identifier token.
   Operands.push_back(ARMOperand::CreateMSRMask(FlagsVal, S));
   return MatchOperand_Success;
 }
 
 /// parseBankedRegOperand - Try to parse a banked register (e.g. "lr_irq") for
 /// use in the MRS/MSR instructions added to support virtualization.
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parseBankedRegOperand(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = Parser.getTok().getLoc();
   const AsmToken &Tok = Parser.getTok();
   if (!Tok.is(AsmToken::Identifier))
     return MatchOperand_NoMatch;
   StringRef RegName = Tok.getString();
 
ARMAsmParser::parseBankedRegOperand(OperandVector &Operands) {
   if (Encoding == ~0U)
     return MatchOperand_NoMatch;
 
   Parser.Lex(); // Eat identifier token.
   Operands.push_back(ARMOperand::CreateBankedReg(Encoding, S));
   return MatchOperand_Success;
 }
 
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parsePKHImm(OperandVector &Operands, StringRef Op, int Low,
                           int High) {
   MCAsmParser &Parser = getParser();
   const AsmToken &Tok = Parser.getTok();
   if (Tok.isNot(AsmToken::Identifier)) {
     Error(Parser.getTok().getLoc(), Op + " operand expected.");
     return MatchOperand_ParseFail;
   }
if (Val < Low || Val > High) {
     return MatchOperand_ParseFail;
   }
 
   Operands.push_back(ARMOperand::CreateImm(CE, Loc, EndLoc));
 
   return MatchOperand_Success;
 }
 
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parseSetEndImm(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   const AsmToken &Tok = Parser.getTok();
   SMLoc S = Tok.getLoc();
   if (Tok.isNot(AsmToken::Identifier)) {
     Error(S, "'be' or 'le' operand expected");
     return MatchOperand_ParseFail;
   }
ARMAsmParser::parseSetEndImm(OperandVector &Operands) {
   return MatchOperand_Success;
 }
 
 /// parseShifterImm - Parse the shifter immediate operand for SSAT/USAT
 /// instructions. Legal values are:
 ///     lsl #n  'n' in [0,31]
 ///     asr #n  'n' in [1,32]
 ///             n == 32 encoded as n == 0.
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parseShifterImm(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   const AsmToken &Tok = Parser.getTok();
   SMLoc S = Tok.getLoc();
   if (Tok.isNot(AsmToken::Identifier)) {
     Error(S, "shift operator 'asr' or 'lsl' expected");
     return MatchOperand_ParseFail;
   }
ARMAsmParser::parseShifterImm(OperandVector &Operands) {
   Operands.push_back(ARMOperand::CreateShifterImm(isASR, Val, S, EndLoc));
 
   return MatchOperand_Success;
 }
 
 /// parseRotImm - Parse the shifter immediate operand for SXTB/UXTB family
 /// of instructions. Legal values are:
 ///     ror #n  'n' in {0, 8, 16, 24}
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parseRotImm(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   const AsmToken &Tok = Parser.getTok();
   SMLoc S = Tok.getLoc();
   if (Tok.isNot(AsmToken::Identifier))
     return MatchOperand_NoMatch;
   StringRef ShiftName = Tok.getString();
   if (ShiftName != "ror" && ShiftName != "ROR")
if (Val != 8 && Val != 16 && Val != 24 && Val != 0) {
     return MatchOperand_ParseFail;
   }
 
   Operands.push_back(ARMOperand::CreateRotImm(Val, S, EndLoc));
 
   return MatchOperand_Success;
 }
 
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parseModImm(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   MCAsmLexer &Lexer = getLexer();
   int64_t Imm1, Imm2;
 
   SMLoc S = Parser.getTok().getLoc();
 
   // 1) A mod_imm operand can appear in the place of a register name:
if (CE) {
     Error(Sx2, "immediate operand must an even number in the range [0, 30]");
     return MatchOperand_ParseFail;
   } else {
     Error(Sx2, "constant expression expected");
     return MatchOperand_ParseFail;
   }
 }
 
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parseBitfield(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = Parser.getTok().getLoc();
   // The bitfield descriptor is really two operands, the LSB and the width.
   if (Parser.getTok().isNot(AsmToken::Hash) &&
       Parser.getTok().isNot(AsmToken::Dollar)) {
     Error(Parser.getTok().getLoc(), "'#' expected");
     return MatchOperand_ParseFail;
if (Width < 1 || Width > 32 - LSB) {
     return MatchOperand_ParseFail;
   }
 
   Operands.push_back(ARMOperand::CreateBitfield(LSB, Width, S, EndLoc));
 
   return MatchOperand_Success;
 }
 
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parsePostIdxReg(OperandVector &Operands) {
   // Check for a post-index addressing register operand. Specifically:
   // postidx_reg := '+' register {, shift}
   //              | '-' register {, shift}
   //              | register {, shift}
 
   // This method must return MatchOperand_NoMatch without consuming any tokens
   // in the case where there is no match, as other alternatives take other
ARMAsmParser::parsePostIdxReg(OperandVector &Operands) {
   }
 
   Operands.push_back(ARMOperand::CreatePostIdxReg(Reg, isAdd, ShiftTy,
                                                   ShiftImm, S, E));
 
   return MatchOperand_Success;
 }
 
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parseAM3Offset(OperandVector &Operands) {
   // Check for a post-index addressing register operand. Specifically:
   // am3offset := '+' register
   //              | '-' register
   //              | register
   //              | # imm
   //              | # + imm
   //              | # - imm
if (Imm == 32)
       Imm = 0;
     Amount = Imm;
   }
 
   return false;
 }
 
 /// parseFPImm - A floating point immediate expression operand.
-ARMAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 ARMAsmParser::parseFPImm(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   // Anything that can accept a floating point constant as an operand
   // needs to go through here, as the regular parseExpression is
   // integer only.
   //
   // This routine still creates a generic Immediate operand, containing
   // a bitcast of the 64-bit floating point value. The various operands

lib/Target/AVR/AsmParser/AVRAsmParser.cpp

case AsmToken::Minus: {
     return false;
   }
   }
 
   // Could not parse operand
   return true;
 }
 
-AVRAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 AVRAsmParser::parseMemriOperand(OperandVector &Operands) {
   DEBUG(dbgs() << "parseMemriOperand()\n");
 
   SMLoc E, S;
   MCExpr const *Expression;
   int RegNo;
 
   // Parse register.

lib/Target/Lanai/AsmParser/LanaiAsmParser.cpp

const LanaiMCExpr *LHSSymbolRefExpr =
         dyn_cast<LanaiMCExpr>(BinaryExpr->getLHS());
     return (LHSSymbolRefExpr &&
             LHSSymbolRefExpr->getKind() == LanaiMCExpr::VK_Lanai_None);
   }
   return false;
 }
 
 // Matches memory operand. Returns true if error encountered.
-LanaiAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 LanaiAsmParser::parseMemoryOperand(OperandVector &Operands) {
   // Try to match a memory operand.
   // The memory operands are of the form:
   //  (1)  Register|Immediate|'' '[' '*'? Register '*'? ']' or
   //                            ^
   //  (2)  '[' '*'? Register '*'? AluOperator Register ']'
   //      ^
   //  (3)  '[' '--'|'++' Register '--'|'++' ']'
Operands.push_back(
           : LanaiOperand::MorphToMemRegReg(BaseReg, std::move(Offset), AluOp));
 
   return MatchOperand_Success;
 }
 
 // Looks at a token type and creates the relevant operand from this
 // information, adding to operands.
 // If operand was parsed, returns false, else true.
-LanaiAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 LanaiAsmParser::parseOperand(OperandVector *Operands, StringRef Mnemonic) {
   // Check if the current operand has a custom associated parser, if so, try to
   // custom parse the operand, or fallback to the general approach.
   OperandMatchResultTy Result = MatchOperandParserImpl(*Operands, Mnemonic);
 
   if (Result == MatchOperand_Success)
     return Result;
   if (Result == MatchOperand_ParseFail) {

lib/Target/Mips/AsmParser/MipsAsmParser.cpp

 bool MipsAsmParser::parseMemOffset(const MCExpr *&Res, bool isParenExpr) {
   SMLoc S;
 
   if (isParenExpr)
     return getParser().parseParenExprOfDepth(0, Res, S);
   return getParser().parseExpression(Res);
 }
 
-MipsAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 MipsAsmParser::parseMemOperand(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   DEBUG(dbgs() << "parseMemOperand\n");
   const MCExpr *IdVal = nullptr;
   SMLoc S;
   bool isParenExpr = false;
-  MipsAsmParser::OperandMatchResultTy Res = MatchOperand_NoMatch;
+  OperandMatchResultTy Res = MatchOperand_NoMatch;
   // First operand is the offset.
   S = Parser.getTok().getLoc();
 
   if (getLexer().getKind() == AsmToken::LParen) {
     Parser.Lex();
     isParenExpr = true;
   }
 
if (Expr->getKind() == MCExpr::SymbolRef) {
           llvm_unreachable("Should never ParseFail");
         return false;
       }
     }
   }
   return false;
 }
 
-MipsAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 MipsAsmParser::matchAnyRegisterNameWithoutDollar(OperandVector &Operands,
                                                  StringRef Identifier,
                                                  SMLoc S) {
   int Index = matchCPURegisterName(Identifier);
   if (Index != -1) {
     Operands.push_back(MipsOperand::createGPRReg(
         Index, Identifier, getContext().getRegisterInfo(), S,
         getLexer().getLoc(), *this));
Operands.push_back(MipsOperand::createMSACtrlReg(
         Index, Identifier, getContext().getRegisterInfo(), S,
         getLexer().getLoc(), *this));
     return MatchOperand_Success;
   }
 
   return MatchOperand_NoMatch;
 }
 
-MipsAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 MipsAsmParser::matchAnyRegisterWithoutDollar(OperandVector &Operands, SMLoc S) {
   MCAsmParser &Parser = getParser();
   auto Token = Parser.getLexer().peekTok(false);
 
   if (Token.is(AsmToken::Identifier)) {
     DEBUG(dbgs() << ".. identifier\n");
     StringRef Identifier = Token.getIdentifier();
     OperandMatchResultTy ResTy =
         matchAnyRegisterNameWithoutDollar(Operands, Identifier, S);
     return ResTy;
   } else if (Token.is(AsmToken::Integer)) {
     DEBUG(dbgs() << ".. integer\n");
     Operands.push_back(MipsOperand::createNumericReg(
         Token.getIntVal(), Token.getString(), getContext().getRegisterInfo(), S,
         Token.getLoc(), *this));
     return MatchOperand_Success;
   }
 
   DEBUG(dbgs() << Parser.getTok().getKind() << "\n");
 
   return MatchOperand_NoMatch;
 }
 
-MipsAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 MipsAsmParser::parseAnyRegister(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   DEBUG(dbgs() << "parseAnyRegister\n");
 
   auto Token = Parser.getTok();
 
   SMLoc S = Token.getLoc();
 
MipsAsmParser::parseAnyRegister(OperandVector &Operands) {
   OperandMatchResultTy ResTy = matchAnyRegisterWithoutDollar(Operands, S);
   if (ResTy == MatchOperand_Success) {
     Parser.Lex(); // $
     Parser.Lex(); // identifier
   }
   return ResTy;
 }
 
-MipsAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 MipsAsmParser::parseJumpTarget(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   DEBUG(dbgs() << "parseJumpTarget\n");
 
   SMLoc S = getLexer().getLoc();
 
   // Registers are a valid target and have priority over symbols.
   OperandMatchResultTy ResTy = parseAnyRegister(Operands);
   if (ResTy != MatchOperand_NoMatch)
     return ResTy;
 
   // Integers and expressions are acceptable
   const MCExpr *Expr = nullptr;
   if (Parser.parseExpression(Expr)) {
     // We have no way of knowing if a symbol was consumed so we must ParseFail
     return MatchOperand_ParseFail;
   }
   Operands.push_back(
       MipsOperand::CreateImm(Expr, S, getLexer().getLoc(), *this));
   return MatchOperand_Success;
 }
 
-MipsAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 MipsAsmParser::parseInvNum(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   const MCExpr *IdVal;
   // If the first token is '$' we may have register operand.
   if (Parser.getTok().is(AsmToken::Dollar))
     return MatchOperand_NoMatch;
   SMLoc S = Parser.getTok().getLoc();
   if (getParser().parseExpression(IdVal))
     return MatchOperand_ParseFail;
   const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(IdVal);
   assert(MCE && "Unexpected MCExpr type.");
   int64_t Val = MCE->getValue();
   SMLoc E = SMLoc::getFromPointer(Parser.getTok().getLoc().getPointer() - 1);
   Operands.push_back(MipsOperand::CreateImm(
       MCConstantExpr::create(0 - Val, getContext()), S, E, *this));
   return MatchOperand_Success;
 }
 
-MipsAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 MipsAsmParser::parseRegisterList(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SmallVector<unsigned, 10> Regs;
   unsigned RegNo;
   unsigned PrevReg = Mips::NoRegister;
   bool RegRange = false;
   SmallVector<std::unique_ptr<MCParsedAsmOperand>, 8> TmpOperands;
 
MipsAsmParser::parseRegisterList(OperandVector &Operands) {
   }
 
   SMLoc E = Parser.getTok().getLoc();
   Operands.push_back(MipsOperand::CreateRegList(Regs, S, E, *this));
   parseMemOperand(Operands);
   return MatchOperand_Success;
 }
 
-MipsAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 MipsAsmParser::parseRegisterPair(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
 
   SMLoc S = Parser.getTok().getLoc();
   if (parseAnyRegister(Operands) != MatchOperand_Success)
     return MatchOperand_ParseFail;
 
   SMLoc E = Parser.getTok().getLoc();
   MipsOperand Op = static_cast<MipsOperand &>(*Operands.back());
 
   Operands.pop_back();
   Operands.push_back(MipsOperand::CreateRegPair(Op, S, E, *this));
   return MatchOperand_Success;
 }
 
-MipsAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 MipsAsmParser::parseMovePRegPair(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SmallVector<std::unique_ptr<MCParsedAsmOperand>, 8> TmpOperands;
   SmallVector<unsigned, 10> Regs;
 
   if (Parser.getTok().isNot(AsmToken::Dollar))
     return MatchOperand_ParseFail;
 

lib/Target/Sparc/AsmParser/SparcAsmParser.cpp

for (;;) {
         return Error(L, "unexpected token in directive");
       Parser.Lex();
     }
   }
   Parser.Lex();
   return false;
 }
 
-SparcAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 SparcAsmParser::parseMEMOperand(OperandVector &Operands) {
 
   SMLoc S, E;
   unsigned BaseReg = 0;
 
   if (ParseRegister(BaseReg, S, E)) {
     return MatchOperand_NoMatch;
   }
SparcAsmParser::parseMEMOperand(OperandVector &Operands) {
 
   Operands.push_back(
       Offset->isImm() ? SparcOperand::MorphToMEMri(BaseReg, std::move(Offset))
                       : SparcOperand::MorphToMEMrr(BaseReg, std::move(Offset)));
 
   return MatchOperand_Success;
 }
 
-SparcAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 SparcAsmParser::parseOperand(OperandVector &Operands, StringRef Mnemonic) {
 
   OperandMatchResultTy ResTy = MatchOperandParserImpl(Operands, Mnemonic);
 
   // If there wasn't a custom match, try the generic matcher below. Otherwise,
   // there was a match, but an error occurred, in which case, just return that
   // the operand parsing failed.
   if (ResTy == MatchOperand_Success || ResTy == MatchOperand_ParseFail)
if (ResTy != MatchOperand_Success || !Op)
     return MatchOperand_ParseFail;
 
   // Push the parsed operand into the list of operands
   Operands.push_back(std::move(Op));
 
   return MatchOperand_Success;
 }
 
-SparcAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 SparcAsmParser::parseSparcAsmOperand(std::unique_ptr<SparcOperand> &Op,
                                      bool isCall) {
 
   SMLoc S = Parser.getTok().getLoc();
   SMLoc E = SMLoc::getFromPointer(Parser.getTok().getLoc().getPointer() - 1);
   const MCExpr *EVal;
 
   Op = nullptr;
if (!getParser().parseIdentifier(Identifier)) {
       Op = SparcOperand::CreateImm(Res, S, E);
     }
     break;
   }
   }
   return (Op) ? MatchOperand_Success : MatchOperand_ParseFail;
 }
 
-SparcAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 SparcAsmParser::parseBranchModifiers(OperandVector &Operands) {
 
   // parse (,a|,pn|,pt)+
 
   while (getLexer().is(AsmToken::Comma)) {
 
     Parser.Lex(); // Eat the comma
 

lib/Target/SystemZ/AsmParser/SystemZAsmParser.cpp

bool SystemZAsmParser::parseRegister(Register &Reg, RegisterGroup Group,
   if (Reg.Num == 0 && IsAddress)
     return Error(Reg.StartLoc, "%r0 used in an address");
   if (Regs)
     Reg.Num = Regs[Reg.Num];
   return false;
 }
 
 // Parse a register and add it to Operands.  The other arguments are as above.
-SystemZAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 SystemZAsmParser::parseRegister(OperandVector &Operands, RegisterGroup Group,
                                 const unsigned *Regs, RegisterKind Kind) {
   if (Parser.getTok().isNot(AsmToken::Percent))
     return MatchOperand_NoMatch;
 
   Register Reg;
   bool IsAddress = (Kind == ADDR32Reg || Kind == ADDR64Reg);
   if (parseRegister(Reg, Group, Regs, IsAddress))
     return MatchOperand_ParseFail;
 
   Operands.push_back(SystemZOperand::createReg(Kind, Reg.Num,
                                                Reg.StartLoc, Reg.EndLoc));
   return MatchOperand_Success;
 }
 
 // Parse any type of register (including integers) and add it to Operands.
-SystemZAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 SystemZAsmParser::parseAnyRegister(OperandVector &Operands) {
   // Handle integer values.
   if (Parser.getTok().is(AsmToken::Integer)) {
     const MCExpr *Register;
     SMLoc StartLoc = Parser.getTok().getLoc();
     if (Parser.parseExpression(Register))
       return MatchOperand_ParseFail;
 
if (getLexer().isNot(AsmToken::RParen))
       return Error(Parser.getTok().getLoc(), "unexpected token in address");
     Parser.Lex();
   }
   return false;
 }
 
 // Parse a memory operand and add it to Operands.  The other arguments
 // are as above.
-SystemZAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 SystemZAsmParser::parseAddress(OperandVector &Operands, MemoryKind MemKind,
                                const unsigned *Regs, RegisterKind RegKind) {
   SMLoc StartLoc = Parser.getTok().getLoc();
   unsigned Base, Index;
   bool IsVector;
   const MCExpr *Disp;
   const MCExpr *Length;
   if (parseAddress(Base, Disp, Index, IsVector, Length, Regs, RegKind))
bool SystemZAsmParser::MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
 
   case Match_MnemonicFail:
     return Error(IDLoc, "invalid instruction");
   }
 
   llvm_unreachable("Unexpected match type");
 }
 
-SystemZAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 SystemZAsmParser::parseAccessReg(OperandVector &Operands) {
   if (Parser.getTok().isNot(AsmToken::Percent))
     return MatchOperand_NoMatch;
 
   Register Reg;
   if (parseRegister(Reg, RegAccess, nullptr))
     return MatchOperand_ParseFail;
 
   Operands.push_back(SystemZOperand::createAccessReg(Reg.Num,
                                                      Reg.StartLoc,
                                                      Reg.EndLoc));
   return MatchOperand_Success;
 }
 
-SystemZAsmParser::OperandMatchResultTy
+OperandMatchResultTy
 SystemZAsmParser::parsePCRel(OperandVector &Operands, int64_t MinVal,
                              int64_t MaxVal, bool AllowTLS) {
   MCContext &Ctx = getContext();
   MCStreamer &Out = getStreamer();
   const MCExpr *Expr;
   SMLoc StartLoc = Parser.getTok().getLoc();
   if (getParser().parseExpression(Expr))
     return MatchOperand_NoMatch;

utils/TableGen/AsmMatcherEmitter.cpp

for (const OperandMatchEntry &OMI : Info.OperandMatchInfo) {
     OS << " */";
 
     OS << " },\n";
   }
   OS << "};\n\n";
 
   // Emit the operand class switch to call the correct custom parser for
   // the found operand class.
-  OS << Target.getName() << ClassName << "::OperandMatchResultTy "
-     << Target.getName() << ClassName << "::\n"
+  OS << "OperandMatchResultTy " << Target.getName() << ClassName << "::\n"
      << "tryCustomParseOperand(OperandVector"
      << " &Operands,\n                      unsigned MCK) {\n\n"
      << "  switch(MCK) {\n";
 
   for (const auto &CI : Info.Classes) {
     if (CI.ParserMethod.empty())
       continue;
     OS << "  case " << CI.Name << ":\n"
        << "    return " << CI.ParserMethod << "(Operands);\n";
   }
 
   OS << "  default:\n";
   OS << "    return MatchOperand_NoMatch;\n";
   OS << "  }\n";
   OS << "  return MatchOperand_NoMatch;\n";
   OS << "}\n\n";
 
   // Emit the static custom operand parser. This code is very similar with
   // the other matcher. Also use MatchResultTy here just in case we go for
   // a better error handling.
-  OS << Target.getName() << ClassName << "::OperandMatchResultTy "
-     << Target.getName() << ClassName << "::\n"
+  OS << "OperandMatchResultTy " << Target.getName() << ClassName << "::\n"
      << "MatchOperandParserImpl(OperandVector"
      << " &Operands,\n                       StringRef Mnemonic) {\n";
 
   // Emit code to get the available features.
   OS << "  // Get the current feature set.\n";
   OS << "  uint64_t AvailableFeatures = getAvailableFeatures();\n\n";
 
   OS << "  // Get the next operand index.\n";
if (HasMnemonicFirst)
     OS << "  bool mnemonicIsValid(StringRef Mnemonic, unsigned VariantID);\n";
   OS << "  unsigned MatchInstructionImpl(const OperandVector &Operands,\n"
      << "                                MCInst &Inst,\n"
      << "                                uint64_t &ErrorInfo,"
      << " bool matchingInlineAsm,\n"
      << "                                unsigned VariantID = 0);\n";
 
   if (!Info.OperandMatchInfo.empty()) {
-    OS << "\n  enum OperandMatchResultTy {\n";
-    OS << "    MatchOperand_Success,    // operand matched successfully\n";
-    OS << "    MatchOperand_NoMatch,    // operand did not match\n";
-    OS << "    MatchOperand_ParseFail   // operand matched but had errors\n";
-    OS << "  };\n";
     OS << "  OperandMatchResultTy MatchOperandParserImpl(\n";
     OS << "    OperandVector &Operands,\n";
     OS << "    StringRef Mnemonic);\n";
 
     OS << "  OperandMatchResultTy tryCustomParseOperand(\n";
     OS << "    OperandVector &Operands,\n";
     OS << "    unsigned MCK);\n\n";
   }