[LLVMdev] AsmParser for backend

[Ulrich Weigand]

Jonathan <gamma_chen at yahoo.com.tw> wrote:

> I try to create a backend to support AsmParser, but it hasn't the red
part
> as below. I find the Mips has this. Do you know how to make it appear?
>
> Jonathan
>
> #ifdef GET_ASSEMBLER_HEADER
> #undef GET_ASSEMBLER_HEADER
>   // This should be included into the middle of the declaration of
>   // your subclasses implementation of MCTargetAsmParser.
>   unsigned ComputeAvailableFeatures(uint64_t FeatureBits) const;
>   void convertToMCInst(unsigned Kind, MCInst &Inst, unsigned Opcode,
>                        const SmallVectorImpl<MCParsedAsmOperand*>
&Operands);
>   void convertToMapAndConstraints(unsigned Kind,
>                            const
> SmallVectorImpl<MCParsedAsmOperand*> &Operands);
>   bool mnemonicIsValid(StringRef Mnemonic);
>   unsigned MatchInstructionImpl(
>                            const
> SmallVectorImpl<MCParsedAsmOperand*> &Operands,
>                                 MCInst &Inst,
>                                 unsigned &ErrorInfo, bool
matchingInlineAsm,
>                                 unsigned VariantID = 0);
>
>   enum OperandMatchResultTy {
>     MatchOperand_Success,    // operand matched successfully
>     MatchOperand_NoMatch,    // operand did not match
>     MatchOperand_ParseFail   // operand matched but had errors
>   };
>   OperandMatchResultTy MatchOperandParserImpl(
>     SmallVectorImpl<MCParsedAsmOperand*> &Operands,
>     StringRef Mnemonic);
>   OperandMatchResultTy tryCustomParseOperand(
>     SmallVectorImpl<MCParsedAsmOperand*> &Operands,
>     unsigned MCK);
>
> #endif // GET_ASSEMBLER_HEADER_INFO

My understanding is that this will be generated automatically
if any instruction has an operand that needs a custom parser
(i.e. one that has been defined using the ParserMethod attribute).

Bye,
Ulrich