Function reglevel

third-party/lua-5.5.0/src/lparser.c:236–243

** Convert 'nvar', a compiler index level, to its corresponding ** register. For that, search for the highest variable below that level ** that is in a register and uses its register index ('ridx') plus one. */

** that is in a register and uses its register index ('ridx') plus one.
*/
static lu_byte reglevel (FuncState *fs, int nvar) {
  while (nvar-- > 0) {
    Vardesc *vd = getlocalvardesc(fs, nvar);  /* get previous variable */
    if (varinreg(vd))  /* is in a register? */
      return cast_byte(vd->vd.ridx + 1);
  }
  return 0;  /* no variables in registers */
}


/*