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[RISCV][NFC] Factor out matchRegisterNameHelper in RISCVAsmParser.cpp 

Contains common logic to match a string to a register name.

llvm-svn: 356330
This commit is contained in:
Alex Bradbury 2019-03-17 12:02:32 +00:00
parent b18e314a7c
commit 997947961a
1 changed files with 17 additions and 11 deletions
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28
llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
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@ -908,6 +908,16 @@ bool RISCVAsmParser::MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
llvm_unreachable("Unknown match type detected!");
}
// Attempts to match Name as a register (either using the default name or
// alternative ABI names), setting RegNo to the matching register. Upon
// failure, returns true and sets RegNo to 0.
static bool matchRegisterNameHelper(unsigned &RegNo, StringRef Name) {
RegNo = MatchRegisterName(Name);
if (RegNo == 0)
RegNo = MatchRegisterAltName(Name);
return RegNo == 0;
}
bool RISCVAsmParser::ParseRegister(unsigned &RegNo, SMLoc &StartLoc,
SMLoc &EndLoc) {
const AsmToken &Tok = getParser().getTok();
@ -916,10 +926,7 @@ bool RISCVAsmParser::ParseRegister(unsigned &RegNo, SMLoc &StartLoc,
RegNo = 0;
StringRef Name = getLexer().getTok().getIdentifier();
RegNo = MatchRegisterName(Name);
if (RegNo == 0)
RegNo = MatchRegisterAltName(Name);
if (RegNo == 0)
if (matchRegisterNameHelper(RegNo, Name))
return Error(StartLoc, "invalid register name");
getParser().Lex(); // Eat identifier token.
@ -946,14 +953,13 @@ OperandMatchResultTy RISCVAsmParser::parseRegister(OperandVector &Operands,
return MatchOperand_NoMatch;
case AsmToken::Identifier:
StringRef Name = getLexer().getTok().getIdentifier();
unsigned RegNo = MatchRegisterName(Name);
unsigned RegNo;
matchRegisterNameHelper(RegNo, Name);
if (RegNo == 0) {
RegNo = MatchRegisterAltName(Name);
if (RegNo == 0) {
if (HadParens)
getLexer().UnLex(Buf[0]);
return MatchOperand_NoMatch;
}
if (HadParens)
getLexer().UnLex(Buf[0]);
return MatchOperand_NoMatch;
}
if (HadParens)
Operands.push_back(RISCVOperand::createToken("(", FirstS, isRV64()));