Function varinfo

third-party/lua-5.4.6/src/ldebug.c:732–745

** Build a string with a "description" for the value 'o', such as ** "variable 'x'" or "upvalue 'y'". */

** "variable 'x'" or "upvalue 'y'".
*/
static const char *varinfo (lua_State *L, const TValue *o) {
  CallInfo *ci = L->ci;
  const char *name = NULL;  /* to avoid warnings */
  const char *kind = NULL;
  if (isLua(ci)) {
    kind = getupvalname(ci, o, &name);  /* check whether 'o' is an upvalue */
    if (!kind) {  /* not an upvalue? */
      int reg = instack(ci, o);  /* try a register */
      if (reg >= 0)  /* is 'o' a register? */
        kind = getobjname(ci_func(ci)->p, currentpc(ci), reg, &name);
    }
  }
  return formatvarinfo(L, kind, name);
}


/*