Function getfuncname

lua/ldebug.c:549–560

static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name) {
  Instruction i;
  if ((isLua(ci) && ci->tailcalls > 0) || !isLua(ci - 1))
    return NULL;  /* calling function is not Lua (or is unknown) */
  ci--;  /* calling function */
  i = ci_func(ci)->l.p->code[currentpc(L, ci)];
  if (GET_OPCODE(i) == OP_CALL || GET_OPCODE(i) == OP_TAILCALL ||
      GET_OPCODE(i) == OP_TFORLOOP)
    return getobjname(L, ci, GETARG_A(i), name);
  else
    return NULL;  /* no useful name can be found */
}


/* only ANSI way to check whether a pointer points to an array */