Function luaG_tracecall

third-party/lua-5.5.0/src/ldebug.c:910–921

** Traces Lua calls. If code is running the first instruction of a function, ** and function is not vararg, and it is not coming from an yield, ** calls 'luaD_hookcall'. (Vararg functions will call 'luaD_hookcall' ** after adjusting its variable arguments; otherwise, they could call ** a line/count hook before the call hook. Functions coming from ** an yield already called 'luaD_hookcall' before y

** an yield already called 'luaD_hookcall' before yielding.)
*/
int luaG_tracecall (lua_State *L) {
  CallInfo *ci = L->ci;
  Proto *p = ci_func(ci)->p;
  ci->u.l.trap = 1;  /* ensure hooks will be checked */
  if (ci->u.l.savedpc == p->code) {  /* first instruction (not resuming)? */
    if (isvararg(p))
      return 0;  /* hooks will start at VARARGPREP instruction */
    else if (!(ci->callstatus & CIST_HOOKYIELD))  /* not yielded? */
      luaD_hookcall(L, ci);  /* check 'call' hook */
  }
  return 1;  /* keep 'trap' on */
}


/*