Function buildhiddenargs

third-party/lua-5.5.0/src/ltm.c:255–269

** initial stack: func arg1 ... argn extra1 ... ** ^ ci->func ^ L->top ** final stack: func nil ... nil extra1 ... func arg1 ... argn ** ^ ci->func */

**                                          ^ ci->func
*/
static void buildhiddenargs (lua_State *L, CallInfo *ci, const Proto *p,
                             int totalargs, int nfixparams, int nextra) {
  int i;
  ci->u.l.nextraargs = nextra;
  luaD_checkstack(L, p->maxstacksize + 1);
  /* copy function to the top of the stack, after extra arguments */
  setobjs2s(L, L->top.p++, ci->func.p);
  /* move fixed parameters to after the copied function */
  for (i = 1; i <= nfixparams; i++) {
    setobjs2s(L, L->top.p++, ci->func.p + i);
    setnilvalue(s2v(ci->func.p + i));  /* erase original parameter (for GC) */
  }
  ci->func.p += totalargs + 1;  /* 'func' now lives after hidden arguments */
  ci->top.p += totalargs + 1;
}


void luaT_adjustvarargs (lua_State *L, CallInfo *ci, const Proto *p) {