src/lstate.c

   1 /*
   2 ** $Id: lstate.c,v 1.6 1998/06/02 20:37:04 roberto Exp $
   3 ** Global State
   4 ** See Copyright Notice in lua.h
   5 */
   6
   7
   8 #include "lbuiltin.h"
   9 #include "ldo.h"
  10 #include "lfunc.h"
  11 #include "lgc.h"
  12 #include "llex.h"
  13 #include "lmem.h"
  14 #include "lstate.h"
  15 #include "lstring.h"
  16 #include "ltable.h"
  17 #include "ltm.h"
  18
  19
  20 lua_State *lua_state = NULL;
  21
  22
  23 void lua_open (void)
  24 {
  25   if (lua_state) return;
  26   lua_state = luaM_new(lua_State);
  27   L->numCblocks = 0;
  28   L->Cstack.base = 0;
  29   L->Cstack.lua2C = 0;
  30   L->Cstack.num = 0;
  31   L->errorJmp = NULL;
  32   L->rootproto.next = NULL;
  33   L->rootproto.marked = 0;
  34   L->rootcl.next = NULL;
  35   L->rootcl.marked = 0;
  36   L->rootglobal.next = NULL;
  37   L->rootglobal.marked = 0;
  38   L->roottable.next = NULL;
  39   L->roottable.marked = 0;
  40   L->refArray = NULL;
  41   L->refSize = 0;
  42   L->Mbuffsize = 0;
  43   L->Mbuffnext = 0;
  44   L->Mbuffbase = NULL;
  45   L->Mbuffer = NULL;
  46   L->GCthreshold = GARBAGE_BLOCK;
  47   L->nblocks = 0;
  48   luaD_init();
  49   luaS_init();
  50   luaX_init();
  51   luaT_init();
  52   luaB_predefine();
  53 }
  54
  55
  56 void lua_close (void)
  57 {
  58   TaggedString *alludata = luaS_collectudata();
  59   L->GCthreshold = MAX_INT;  /* to avoid GC during GC */
  60   luaC_hashcallIM((Hash *)L->roottable.next);  /* GC t.methods for tables */
  61   luaC_strcallIM(alludata);  /* GC tag methods for userdata */
  62   luaD_gcIM(&luaO_nilobject);  /* GC tag method for nil (signal end of GC) */
  63   luaH_free((Hash *)L->roottable.next);
  64   luaF_freeproto((TProtoFunc *)L->rootproto.next);
  65   luaF_freeclosure((Closure *)L->rootcl.next);
  66   luaS_free(alludata);
  67   luaS_freeall();
  68   luaM_free(L->stack.stack);
  69   luaM_free(L->IMtable);
  70   luaM_free(L->refArray);
  71   luaM_free(L->Mbuffer);
  72   luaM_free(L);
  73   L = NULL;
  74 #ifdef DEBUG
  75   printf("total de blocos: %ld\n", numblocks);
  76   printf("total de memoria: %ld\n", totalmem);
  77 #endif
  78 }
  79
  80
  81 lua_State *lua_setstate (lua_State *st) {
  82   lua_State *old = lua_state;
  83   lua_state = st;
  84   return old;
  85 }
  86