src/lj_udata.c

   1 /*
   2 ** Userdata handling.
   3 ** Copyright (C) 2005-2012 Mike Pall. See Copyright Notice in luajit.h
   4 */
   5
   6 #define lj_udata_c
   7 #define LUA_CORE
   8
   9 #include "lj_obj.h"
  10 #include "lj_gc.h"
  11 #include "lj_udata.h"
  12
  13 GCudata *lj_udata_new(lua_State *L, MSize sz, GCtab *env)
  14 {
  15   GCudata *ud = lj_mem_newt(L, sizeof(GCudata) + sz, GCudata);
  16   global_State *g = G(L);
  17   newwhite(g, ud);  /* Not finalized. */
  18   ud->gct = ~LJ_TUDATA;
  19   ud->udtype = UDTYPE_USERDATA;
  20   ud->len = sz;
  21   /* NOBARRIER: The GCudata is new (marked white). */
  22   setgcrefnull(ud->metatable);
  23   setgcref(ud->env, obj2gco(env));
  24   /* Chain to userdata list (after main thread). */
  25   setgcrefr(ud->nextgc, mainthread(g)->nextgc);
  26   setgcref(mainthread(g)->nextgc, obj2gco(ud));
  27   return ud;
  28 }
  29
  30 void LJ_FASTCALL lj_udata_free(global_State *g, GCudata *ud)
  31 {
  32   lj_mem_free(g, ud, sizeudata(ud));
  33 }
  34