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  1. /*
  2. ** $Id: lstate.c,v 2.36.1.2 2008/01/03 15:20:39 roberto Exp $
  3. ** Global State
  4. ** See Copyright Notice in lua.h
  5. */
  6.  
  7.  
  8. #include <stddef.h>
  9.  
  10. #define lstate_c
  11. #define LUA_CORE
  12.  
  13. #include "lua.h"
  14.  
  15. #include "ldebug.h"
  16. #include "ldo.h"
  17. #include "lfunc.h"
  18. #include "lgc.h"
  19. #include "llex.h"
  20. #include "lmem.h"
  21. #include "lstate.h"
  22. #include "lstring.h"
  23. #include "ltable.h"
  24. #include "ltm.h"
  25.  
  26.  
  27. #define state_size(x)   (sizeof(x) + LUAI_EXTRASPACE)
  28. #define fromstate(l)    (cast(lu_byte *, (l)) - LUAI_EXTRASPACE)
  29. #define tostate(l)   (cast(lua_State *, cast(lu_byte *, l) + LUAI_EXTRASPACE))
  30.  
  31.  
  32. /*
  33. ** Main thread combines a thread state and the global state
  34. */
  35. typedef struct LG {
  36.   lua_State l;
  37.   global_State g;
  38. } LG;
  39.  
  40.  
  41.  
  42. static void stack_init (lua_State *L1, lua_State *L) {
  43.   /* initialize CallInfo array */
  44.   L1->base_ci = luaM_newvector(L, BASIC_CI_SIZE, CallInfo);
  45.   L1->ci = L1->base_ci;
  46.   L1->size_ci = BASIC_CI_SIZE;
  47.   L1->end_ci = L1->base_ci + L1->size_ci - 1;
  48.   /* initialize stack array */
  49.   L1->stack = luaM_newvector(L, BASIC_STACK_SIZE + EXTRA_STACK, TValue);
  50.   L1->stacksize = BASIC_STACK_SIZE + EXTRA_STACK;
  51.   L1->top = L1->stack;
  52.   L1->stack_last = L1->stack+(L1->stacksize - EXTRA_STACK)-1;
  53.   /* initialize first ci */
  54.   L1->ci->func = L1->top;
  55.   setnilvalue(L1->top++);  /* `function' entry for this `ci' */
  56.   L1->base = L1->ci->base = L1->top;
  57.   L1->ci->top = L1->top + LUA_MINSTACK;
  58. }
  59.  
  60.  
  61. static void freestack (lua_State *L, lua_State *L1) {
  62.   luaM_freearray(L, L1->base_ci, L1->size_ci, CallInfo);
  63.   luaM_freearray(L, L1->stack, L1->stacksize, TValue);
  64. }
  65.  
  66.  
  67. /*
  68. ** open parts that may cause memory-allocation errors
  69. */
  70. static void f_luaopen (lua_State *L, void *ud) {
  71.   global_State *g = G(L);
  72.   UNUSED(ud);
  73.   stack_init(L, L);  /* init stack */
  74.   sethvalue(L, gt(L), luaH_new(L, 0, 2));  /* table of globals */
  75.   sethvalue(L, registry(L), luaH_new(L, 0, 2));  /* registry */
  76.   luaS_resize(L, MINSTRTABSIZE);  /* initial size of string table */
  77.   luaT_init(L);
  78.   luaX_init(L);
  79.   luaS_fix(luaS_newliteral(L, MEMERRMSG));
  80.   g->GCthreshold = 4*g->totalbytes;
  81. }
  82.  
  83.  
  84. static void preinit_state (lua_State *L, global_State *g) {
  85.   G(L) = g;
  86.   L->stack = NULL;
  87.   L->stacksize = 0;
  88.   L->errorJmp = NULL;
  89.   L->hook = NULL;
  90.   L->hookmask = 0;
  91.   L->basehookcount = 0;
  92.   L->allowhook = 1;
  93.   resethookcount(L);
  94.   L->openupval = NULL;
  95.   L->size_ci = 0;
  96.   L->nCcalls = L->baseCcalls = 0;
  97.   L->status = 0;
  98.   L->base_ci = L->ci = NULL;
  99.   L->savedpc = NULL;
  100.   L->errfunc = 0;
  101.   setnilvalue(gt(L));
  102. }
  103.  
  104.  
  105. static void close_state (lua_State *L) {
  106.   global_State *g = G(L);
  107.   luaF_close(L, L->stack);  /* close all upvalues for this thread */
  108.   luaC_freeall(L);  /* collect all objects */
  109.   lua_assert(g->rootgc == obj2gco(L));
  110.   lua_assert(g->strt.nuse == 0);
  111.   luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size, TString *);
  112.   luaZ_freebuffer(L, &g->buff);
  113.   freestack(L, L);
  114.   lua_assert(g->totalbytes == sizeof(LG));
  115.   (*g->frealloc)(g->ud, fromstate(L), state_size(LG), 0);
  116. }
  117.  
  118.  
  119. lua_State *luaE_newthread (lua_State *L) {
  120.   lua_State *L1 = tostate(luaM_malloc(L, state_size(lua_State)));
  121.   luaC_link(L, obj2gco(L1), LUA_TTHREAD);
  122.   preinit_state(L1, G(L));
  123.   stack_init(L1, L);  /* init stack */
  124.   setobj2n(L, gt(L1), gt(L));  /* share table of globals */
  125.   L1->hookmask = L->hookmask;
  126.   L1->basehookcount = L->basehookcount;
  127.   L1->hook = L->hook;
  128.   resethookcount(L1);
  129.   lua_assert(iswhite(obj2gco(L1)));
  130.   return L1;
  131. }
  132.  
  133.  
  134. void luaE_freethread (lua_State *L, lua_State *L1) {
  135.   luaF_close(L1, L1->stack);  /* close all upvalues for this thread */
  136.   lua_assert(L1->openupval == NULL);
  137.   luai_userstatefree(L1);
  138.   freestack(L, L1);
  139.   luaM_freemem(L, fromstate(L1), state_size(lua_State));
  140. }
  141.  
  142.  
  143. LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
  144.   int i;
  145.   lua_State *L;
  146.   global_State *g;
  147.   void *l = (*f)(ud, NULL, 0, state_size(LG));
  148.   if (l == NULL) return NULL;
  149.   L = tostate(l);
  150.   g = &((LG *)L)->g;
  151.   L->next = NULL;
  152.   L->tt = LUA_TTHREAD;
  153.   g->currentwhite = bit2mask(WHITE0BIT, FIXEDBIT);
  154.   L->marked = luaC_white(g);
  155.   set2bits(L->marked, FIXEDBIT, SFIXEDBIT);
  156.   preinit_state(L, g);
  157.   g->frealloc = f;
  158.   g->ud = ud;
  159.   g->mainthread = L;
  160.   g->uvhead.u.l.prev = &g->uvhead;
  161.   g->uvhead.u.l.next = &g->uvhead;
  162.   g->GCthreshold = 0;  /* mark it as unfinished state */
  163.   g->strt.size = 0;
  164.   g->strt.nuse = 0;
  165.   g->strt.hash = NULL;
  166.   setnilvalue(registry(L));
  167.   luaZ_initbuffer(L, &g->buff);
  168.   g->panic = NULL;
  169.   g->gcstate = GCSpause;
  170.   g->rootgc = obj2gco(L);
  171.   g->sweepstrgc = 0;
  172.   g->sweepgc = &g->rootgc;
  173.   g->gray = NULL;
  174.   g->grayagain = NULL;
  175.   g->weak = NULL;
  176.   g->tmudata = NULL;
  177.   g->totalbytes = sizeof(LG);
  178.   g->gcpause = LUAI_GCPAUSE;
  179.   g->gcstepmul = LUAI_GCMUL;
  180.   g->gcdept = 0;
  181.   for (i=0; i<NUM_TAGS; i++) g->mt[i] = NULL;
  182.   if (luaD_rawrunprotected(L, f_luaopen, NULL) != 0) {
  183.     /* memory allocation error: free partial state */
  184.     close_state(L);
  185.     L = NULL;
  186.   }
  187.   else
  188.     luai_userstateopen(L);
  189.   return L;
  190. }
  191.  
  192.  
  193. static void callallgcTM (lua_State *L, void *ud) {
  194.   UNUSED(ud);
  195.   luaC_callGCTM(L);  /* call GC metamethods for all udata */
  196. }
  197.  
  198.  
  199. LUA_API void lua_close (lua_State *L) {
  200.   L = G(L)->mainthread;  /* only the main thread can be closed */
  201.   lua_lock(L);
  202.   luaF_close(L, L->stack);  /* close all upvalues for this thread */
  203.   luaC_separateudata(L, 1);  /* separate udata that have GC metamethods */
  204.   L->errfunc = 0;  /* no error function during GC metamethods */
  205.   do {  /* repeat until no more errors */
  206.     L->ci = L->base_ci;
  207.     L->base = L->top = L->ci->base;
  208.     L->nCcalls = L->baseCcalls = 0;
  209.   } while (luaD_rawrunprotected(L, callallgcTM, NULL) != 0);
  210.   lua_assert(G(L)->tmudata == NULL);
  211.   luai_userstateclose(L);
  212.   close_state(L);
  213. }
  214.  
  215.