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