gcc-8.3/gcc/extract_insn()

参照元†

• gcc-8.3/gcc/instantiate_virtual_regs_in_insn()
• gcc-8.3/gcc/tips__rtl

説明†

• パス: gcc-8.3/gcc/recog.c

• FIXME: これは何？
  • 説明

引数†

• rtx_insn *insn
  • gcc-8.3/gcc/rtx_insn

返り値†

• なし

参考†

実装†

/* Analyze INSN and fill in recog_data.  */

void
extract_insn (rtx_insn *insn)
{
  int i;
  int icode;
  int noperands;
  rtx body = PATTERN (insn);

• • gcc-8.3/gcc/rtx
  • gcc-8.3/gcc/PATTERN()

  recog_data.n_operands = 0;
  recog_data.n_alternatives = 0;
  recog_data.n_dups = 0;
  recog_data.is_asm = false;

• • gcc-8.3/gcc/recog_data(global)

  switch (GET_CODE (body))
    {
    case USE:
    case CLOBBER:
    case ASM_INPUT:
    case ADDR_VEC:
    case ADDR_DIFF_VEC:
    case VAR_LOCATION:
    case DEBUG_MARKER:
      return;

• • gcc-8.3/gcc/GET_CODE()

    case SET:
      if (GET_CODE (SET_SRC (body)) == ASM_OPERANDS)
	goto asm_insn;
      else
	goto normal_insn;
    case PARALLEL:
      if ((GET_CODE (XVECEXP (body, 0, 0)) == SET
	   && GET_CODE (SET_SRC (XVECEXP (body, 0, 0))) == ASM_OPERANDS)
	  || GET_CODE (XVECEXP (body, 0, 0)) == ASM_OPERANDS
	  || GET_CODE (XVECEXP (body, 0, 0)) == ASM_INPUT)
	goto asm_insn;
      else
	goto normal_insn;

• • gcc-8.3/gcc/XVECEXP()
  • gcc-8.3/gcc/SET_SRC()

    case ASM_OPERANDS:
    asm_insn:
      recog_data.n_operands = noperands = asm_noperands (body);

• • gcc-8.3/gcc/asm_nooperands()

      if (noperands >= 0)
	{
	  /* This insn is an `asm' with operands.  */

	  /* expand_asm_operands makes sure there aren't too many operands.  */
	  gcc_assert (noperands <= MAX_RECOG_OPERANDS);

	  /* Now get the operand values and constraints out of the insn.  */
	  decode_asm_operands (body, recog_data.operand,
			       recog_data.operand_loc,
			       recog_data.constraints,
			       recog_data.operand_mode, NULL);
	  memset (recog_data.is_operator, 0, sizeof recog_data.is_operator);
	  if (noperands > 0)
	    {
	      const char *p =  recog_data.constraints[0];
	      recog_data.n_alternatives = 1;
	      while (*p)
		recog_data.n_alternatives += (*p++ == ',');
	    }
	  recog_data.is_asm = true;
	  break;
	}
      fatal_insn_not_found (insn);

• • gcc-8.3/gcc/gcc_assert()
  • gcc-8.3/gcc/decode_asm_operands()
  • gcc-8.3/gcc/fatal_insn_not_found()

    default:
    normal_insn:
      /* Ordinary insn: recognize it, get the operands via insn_extract
	 and get the constraints.  */

      icode = recog_memoized (insn);
      if (icode < 0)
	fatal_insn_not_found (insn);

      recog_data.n_operands = noperands = insn_data[icode].n_operands;
      recog_data.n_alternatives = insn_data[icode].n_alternatives;
      recog_data.n_dups = insn_data[icode].n_dups;

      insn_extract (insn);

      for (i = 0; i < noperands; i++)
	{
	  recog_data.constraints[i] = insn_data[icode].operand[i].constraint;
	  recog_data.is_operator[i] = insn_data[icode].operand[i].is_operator;
	  recog_data.operand_mode[i] = insn_data[icode].operand[i].mode;
	  /* VOIDmode match_operands gets mode from their real operand.  */
	  if (recog_data.operand_mode[i] == VOIDmode)
	    recog_data.operand_mode[i] = GET_MODE (recog_data.operand[i]);
	}

• • gcc-8.3/gcc/insn_data(global)
  • gcc-8.3/gcc/recog_memoized()
  • gcc-8.3/gcc/fatal_insn_not_found()
  • gcc-8.3/gcc/insn_extract()
  • gcc-8.3/gcc/GET_MODE()

    }
  for (i = 0; i < noperands; i++)
    recog_data.operand_type[i]
      = (recog_data.constraints[i][0] == '=' ? OP_OUT
	 : recog_data.constraints[i][0] == '+' ? OP_INOUT
	 : OP_IN);

  gcc_assert (recog_data.n_alternatives <= MAX_RECOG_ALTERNATIVES);

  recog_data.insn = NULL;
  which_alternative = -1;
}

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