| /* |
| ** $Id: lstate.c,v 2.36.1.2 2008/01/03 15:20:39 roberto Exp $ |
| ** Global State |
| ** See Copyright Notice in lua.h |
| */ |
| |
| |
| #include <stddef.h> |
| |
| #define lstate_c |
| #define LUA_CORE |
| |
| #include "lua.h" |
| |
| #include "ldebug.h" |
| #include "ldo.h" |
| #include "lfunc.h" |
| #include "lgc.h" |
| #include "llex.h" |
| #include "lmem.h" |
| #include "lstate.h" |
| #include "lstring.h" |
| #include "ltable.h" |
| #include "ltm.h" |
| |
| |
| #define state_size(x) (sizeof(x) + LUAI_EXTRASPACE) |
| #define fromstate(l) (cast(lu_byte *, (l)) - LUAI_EXTRASPACE) |
| #define tostate(l) (cast(lua_State *, cast(lu_byte *, l) + LUAI_EXTRASPACE)) |
| |
| |
| /* |
| ** Main thread combines a thread state and the global state |
| */ |
| typedef struct LG { |
| lua_State l; |
| global_State g; |
| } LG; |
| |
| |
| |
| static void stack_init (lua_State *L1, lua_State *L) { |
| /* initialize CallInfo array */ |
| L1->base_ci = luaM_newvector(L, BASIC_CI_SIZE, CallInfo); |
| L1->ci = L1->base_ci; |
| L1->size_ci = BASIC_CI_SIZE; |
| L1->end_ci = L1->base_ci + L1->size_ci - 1; |
| /* initialize stack array */ |
| L1->stack = luaM_newvector(L, BASIC_STACK_SIZE + EXTRA_STACK, TValue); |
| L1->stacksize = BASIC_STACK_SIZE + EXTRA_STACK; |
| L1->top = L1->stack; |
| L1->stack_last = L1->stack+(L1->stacksize - EXTRA_STACK)-1; |
| /* initialize first ci */ |
| L1->ci->func = L1->top; |
| setnilvalue(L1->top++); /* `function' entry for this `ci' */ |
| L1->base = L1->ci->base = L1->top; |
| L1->ci->top = L1->top + LUA_MINSTACK; |
| } |
| |
| |
| static void freestack (lua_State *L, lua_State *L1) { |
| luaM_freearray(L, L1->base_ci, L1->size_ci, CallInfo); |
| luaM_freearray(L, L1->stack, L1->stacksize, TValue); |
| } |
| |
| |
| /* |
| ** open parts that may cause memory-allocation errors |
| */ |
| static void f_luaopen (lua_State *L, void *ud) { |
| global_State *g = G(L); |
| UNUSED(ud); |
| stack_init(L, L); /* init stack */ |
| sethvalue(L, gt(L), luaH_new(L, 0, 2)); /* table of globals */ |
| sethvalue(L, registry(L), luaH_new(L, 0, 2)); /* registry */ |
| luaS_resize(L, MINSTRTABSIZE); /* initial size of string table */ |
| luaT_init(L); |
| luaX_init(L); |
| luaS_fix(luaS_newliteral(L, MEMERRMSG)); |
| g->GCthreshold = 4*g->totalbytes; |
| } |
| |
| |
| static void preinit_state (lua_State *L, global_State *g) { |
| G(L) = g; |
| L->stack = NULL; |
| L->stacksize = 0; |
| L->errorJmp = NULL; |
| L->hook = NULL; |
| L->hookmask = 0; |
| L->basehookcount = 0; |
| L->allowhook = 1; |
| resethookcount(L); |
| L->openupval = NULL; |
| L->size_ci = 0; |
| L->nCcalls = L->baseCcalls = 0; |
| L->status = 0; |
| L->base_ci = L->ci = NULL; |
| L->savedpc = NULL; |
| L->errfunc = 0; |
| setnilvalue(gt(L)); |
| } |
| |
| |
| static void close_state (lua_State *L) { |
| global_State *g = G(L); |
| luaF_close(L, L->stack); /* close all upvalues for this thread */ |
| luaC_freeall(L); /* collect all objects */ |
| lua_assert(g->rootgc == obj2gco(L)); |
| lua_assert(g->strt.nuse == 0); |
| luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size, TString *); |
| luaZ_freebuffer(L, &g->buff); |
| freestack(L, L); |
| lua_assert(g->totalbytes == sizeof(LG)); |
| (*g->frealloc)(g->ud, fromstate(L), state_size(LG), 0); |
| } |
| |
| |
| lua_State *luaE_newthread (lua_State *L) { |
| lua_State *L1 = tostate(luaM_malloc(L, state_size(lua_State))); |
| luaC_link(L, obj2gco(L1), LUA_TTHREAD); |
| preinit_state(L1, G(L)); |
| stack_init(L1, L); /* init stack */ |
| setobj2n(L, gt(L1), gt(L)); /* share table of globals */ |
| L1->hookmask = L->hookmask; |
| L1->basehookcount = L->basehookcount; |
| L1->hook = L->hook; |
| resethookcount(L1); |
| lua_assert(iswhite(obj2gco(L1))); |
| return L1; |
| } |
| |
| |
| void luaE_freethread (lua_State *L, lua_State *L1) { |
| luaF_close(L1, L1->stack); /* close all upvalues for this thread */ |
| lua_assert(L1->openupval == NULL); |
| luai_userstatefree(L1); |
| freestack(L, L1); |
| luaM_freemem(L, fromstate(L1), state_size(lua_State)); |
| } |
| |
| |
| LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) { |
| int i; |
| lua_State *L; |
| global_State *g; |
| void *l = (*f)(ud, NULL, 0, state_size(LG)); |
| if (l == NULL) return NULL; |
| L = tostate(l); |
| g = &((LG *)L)->g; |
| L->next = NULL; |
| L->tt = LUA_TTHREAD; |
| g->currentwhite = bit2mask(WHITE0BIT, FIXEDBIT); |
| L->marked = luaC_white(g); |
| set2bits(L->marked, FIXEDBIT, SFIXEDBIT); |
| preinit_state(L, g); |
| g->frealloc = f; |
| g->ud = ud; |
| g->mainthread = L; |
| g->uvhead.u.l.prev = &g->uvhead; |
| g->uvhead.u.l.next = &g->uvhead; |
| g->GCthreshold = 0; /* mark it as unfinished state */ |
| g->strt.size = 0; |
| g->strt.nuse = 0; |
| g->strt.hash = NULL; |
| setnilvalue(registry(L)); |
| luaZ_initbuffer(L, &g->buff); |
| g->panic = NULL; |
| g->gcstate = GCSpause; |
| g->rootgc = obj2gco(L); |
| g->sweepstrgc = 0; |
| g->sweepgc = &g->rootgc; |
| g->gray = NULL; |
| g->grayagain = NULL; |
| g->weak = NULL; |
| g->tmudata = NULL; |
| g->totalbytes = sizeof(LG); |
| g->gcpause = LUAI_GCPAUSE; |
| g->gcstepmul = LUAI_GCMUL; |
| g->gcdept = 0; |
| for (i=0; i<NUM_TAGS; i++) g->mt[i] = NULL; |
| if (luaD_rawrunprotected(L, f_luaopen, NULL) != 0) { |
| /* memory allocation error: free partial state */ |
| close_state(L); |
| L = NULL; |
| } |
| else |
| luai_userstateopen(L); |
| return L; |
| } |
| |
| |
| static void callallgcTM (lua_State *L, void *ud) { |
| UNUSED(ud); |
| luaC_callGCTM(L); /* call GC metamethods for all udata */ |
| } |
| |
| |
| LUA_API void lua_close (lua_State *L) { |
| L = G(L)->mainthread; /* only the main thread can be closed */ |
| lua_lock(L); |
| luaF_close(L, L->stack); /* close all upvalues for this thread */ |
| luaC_separateudata(L, 1); /* separate udata that have GC metamethods */ |
| L->errfunc = 0; /* no error function during GC metamethods */ |
| do { /* repeat until no more errors */ |
| L->ci = L->base_ci; |
| L->base = L->top = L->ci->base; |
| L->nCcalls = L->baseCcalls = 0; |
| } while (luaD_rawrunprotected(L, callallgcTM, NULL) != 0); |
| lua_assert(G(L)->tmudata == NULL); |
| luai_userstateclose(L); |
| close_state(L); |
| } |
| |