+++ /dev/null
-/*
-** $Id: lstate.c,v 2.99.1.2 2013/11/08 17:45:31 roberto Exp $
-** Global State
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stddef.h>
-#include <string.h>
-
-#define lstate_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "lapi.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"
-
-
-#if !defined(LUAI_GCPAUSE)
-#define LUAI_GCPAUSE 200 /* 200% */
-#endif
-
-#if !defined(LUAI_GCMAJOR)
-#define LUAI_GCMAJOR 200 /* 200% */
-#endif
-
-#if !defined(LUAI_GCMUL)
-#define LUAI_GCMUL 200 /* GC runs 'twice the speed' of memory allocation */
-#endif
-
-
-#define MEMERRMSG "not enough memory"
-
-
-/*
-** a macro to help the creation of a unique random seed when a state is
-** created; the seed is used to randomize hashes.
-*/
-#if !defined(luai_makeseed)
-#include <time.h>
-#define luai_makeseed() cast(unsigned int, time(NULL))
-#endif
-
-
-
-/*
-** thread state + extra space
-*/
-typedef struct LX {
-#if defined(LUAI_EXTRASPACE)
- char buff[LUAI_EXTRASPACE];
-#endif
- lua_State l;
-} LX;
-
-
-/*
-** Main thread combines a thread state and the global state
-*/
-typedef struct LG {
- LX l;
- global_State g;
-} LG;
-
-
-
-#define fromstate(L) (cast(LX *, cast(lu_byte *, (L)) - offsetof(LX, l)))
-
-
-/*
-** Compute an initial seed as random as possible. In ANSI, rely on
-** Address Space Layout Randomization (if present) to increase
-** randomness..
-*/
-#define addbuff(b,p,e) \
- { size_t t = cast(size_t, e); \
- memcpy(buff + p, &t, sizeof(t)); p += sizeof(t); }
-
-static unsigned int makeseed (lua_State *L) {
- char buff[4 * sizeof(size_t)];
- unsigned int h = luai_makeseed();
- int p = 0;
- addbuff(buff, p, L); /* heap variable */
- addbuff(buff, p, &h); /* local variable */
- addbuff(buff, p, luaO_nilobject); /* global variable */
- addbuff(buff, p, &lua_newstate); /* public function */
- lua_assert(p == sizeof(buff));
- return luaS_hash(buff, p, h);
-}
-
-
-/*
-** set GCdebt to a new value keeping the value (totalbytes + GCdebt)
-** invariant
-*/
-void luaE_setdebt (global_State *g, l_mem debt) {
- g->totalbytes -= (debt - g->GCdebt);
- g->GCdebt = debt;
-}
-
-
-CallInfo *luaE_extendCI (lua_State *L) {
- CallInfo *ci = luaM_new(L, CallInfo);
- lua_assert(L->ci->next == NULL);
- L->ci->next = ci;
- ci->previous = L->ci;
- ci->next = NULL;
- return ci;
-}
-
-
-void luaE_freeCI (lua_State *L) {
- CallInfo *ci = L->ci;
- CallInfo *next = ci->next;
- ci->next = NULL;
- while ((ci = next) != NULL) {
- next = ci->next;
- luaM_free(L, ci);
- }
-}
-
-
-static void stack_init (lua_State *L1, lua_State *L) {
- int i; CallInfo *ci;
- /* initialize stack array */
- L1->stack = luaM_newvector(L, BASIC_STACK_SIZE, TValue);
- L1->stacksize = BASIC_STACK_SIZE;
- for (i = 0; i < BASIC_STACK_SIZE; i++)
- setnilvalue(L1->stack + i); /* erase new stack */
- L1->top = L1->stack;
- L1->stack_last = L1->stack + L1->stacksize - EXTRA_STACK;
- /* initialize first ci */
- ci = &L1->base_ci;
- ci->next = ci->previous = NULL;
- ci->callstatus = 0;
- ci->func = L1->top;
- setnilvalue(L1->top++); /* 'function' entry for this 'ci' */
- ci->top = L1->top + LUA_MINSTACK;
- L1->ci = ci;
-}
-
-
-static void freestack (lua_State *L) {
- if (L->stack == NULL)
- return; /* stack not completely built yet */
- L->ci = &L->base_ci; /* free the entire 'ci' list */
- luaE_freeCI(L);
- luaM_freearray(L, L->stack, L->stacksize); /* free stack array */
-}
-
-
-/*
-** Create registry table and its predefined values
-*/
-static void init_registry (lua_State *L, global_State *g) {
- TValue mt;
- /* create registry */
- Table *registry = luaH_new(L);
- sethvalue(L, &g->l_registry, registry);
- luaH_resize(L, registry, LUA_RIDX_LAST, 0);
- /* registry[LUA_RIDX_MAINTHREAD] = L */
- setthvalue(L, &mt, L);
- luaH_setint(L, registry, LUA_RIDX_MAINTHREAD, &mt);
- /* registry[LUA_RIDX_GLOBALS] = table of globals */
- sethvalue(L, &mt, luaH_new(L));
- luaH_setint(L, registry, LUA_RIDX_GLOBALS, &mt);
-}
-
-
-/*
-** open parts of the state 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 */
- init_registry(L, g);
- luaS_resize(L, MINSTRTABSIZE); /* initial size of string table */
- luaT_init(L);
- luaX_init(L);
- /* pre-create memory-error message */
- g->memerrmsg = luaS_newliteral(L, MEMERRMSG);
- luaS_fix(g->memerrmsg); /* it should never be collected */
- g->gcrunning = 1; /* allow gc */
- g->version = lua_version(NULL);
- luai_userstateopen(L);
-}
-
-
-/*
-** preinitialize a state with consistent values without allocating
-** any memory (to avoid errors)
-*/
-static void preinit_state (lua_State *L, global_State *g) {
- G(L) = g;
- L->stack = NULL;
- L->ci = NULL;
- L->stacksize = 0;
- L->errorJmp = NULL;
- L->nCcalls = 0;
- L->hook = NULL;
- L->hookmask = 0;
- L->basehookcount = 0;
- L->allowhook = 1;
- resethookcount(L);
- L->openupval = NULL;
- L->nny = 1;
- L->status = LUA_OK;
- L->errfunc = 0;
-}
-
-
-static void close_state (lua_State *L) {
- global_State *g = G(L);
- luaF_close(L, L->stack); /* close all upvalues for this thread */
- luaC_freeallobjects(L); /* collect all objects */
- if (g->version) /* closing a fully built state? */
- luai_userstateclose(L);
- luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size);
- luaZ_freebuffer(L, &g->buff);
- freestack(L);
- lua_assert(gettotalbytes(g) == sizeof(LG));
- (*g->frealloc)(g->ud, fromstate(L), sizeof(LG), 0); /* free main block */
-}
-
-
-LUA_API lua_State *lua_newthread (lua_State *L) {
- lua_State *L1;
- lua_lock(L);
- luaC_checkGC(L);
- L1 = &luaC_newobj(L, LUA_TTHREAD, sizeof(LX), NULL, offsetof(LX, l))->th;
- setthvalue(L, L->top, L1);
- api_incr_top(L);
- preinit_state(L1, G(L));
- L1->hookmask = L->hookmask;
- L1->basehookcount = L->basehookcount;
- L1->hook = L->hook;
- resethookcount(L1);
- luai_userstatethread(L, L1);
- stack_init(L1, L); /* init stack */
- lua_unlock(L);
- return L1;
-}
-
-
-void luaE_freethread (lua_State *L, lua_State *L1) {
- LX *l = fromstate(L1);
- luaF_close(L1, L1->stack); /* close all upvalues for this thread */
- lua_assert(L1->openupval == NULL);
- luai_userstatefree(L, L1);
- freestack(L1);
- luaM_free(L, l);
-}
-
-
-LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
- int i;
- lua_State *L;
- global_State *g;
- LG *l = cast(LG *, (*f)(ud, NULL, LUA_TTHREAD, sizeof(LG)));
- if (l == NULL) return NULL;
- L = &l->l.l;
- g = &l->g;
- L->next = NULL;
- L->tt = LUA_TTHREAD;
- g->currentwhite = bit2mask(WHITE0BIT, FIXEDBIT);
- L->marked = luaC_white(g);
- g->gckind = KGC_NORMAL;
- preinit_state(L, g);
- g->frealloc = f;
- g->ud = ud;
- g->mainthread = L;
- g->seed = makeseed(L);
- g->uvhead.u.l.prev = &g->uvhead;
- g->uvhead.u.l.next = &g->uvhead;
- g->gcrunning = 0; /* no GC while building state */
- g->GCestimate = 0;
- g->strt.size = 0;
- g->strt.nuse = 0;
- g->strt.hash = NULL;
- setnilvalue(&g->l_registry);
- luaZ_initbuffer(L, &g->buff);
- g->panic = NULL;
- g->version = NULL;
- g->gcstate = GCSpause;
- g->allgc = NULL;
- g->finobj = NULL;
- g->tobefnz = NULL;
- g->sweepgc = g->sweepfin = NULL;
- g->gray = g->grayagain = NULL;
- g->weak = g->ephemeron = g->allweak = NULL;
- g->totalbytes = sizeof(LG);
- g->GCdebt = 0;
- g->gcpause = LUAI_GCPAUSE;
- g->gcmajorinc = LUAI_GCMAJOR;
- g->gcstepmul = LUAI_GCMUL;
- for (i=0; i < LUA_NUMTAGS; i++) g->mt[i] = NULL;
- if (luaD_rawrunprotected(L, f_luaopen, NULL) != LUA_OK) {
- /* memory allocation error: free partial state */
- close_state(L);
- L = NULL;
- }
- return L;
-}
-
-
-LUA_API void lua_close (lua_State *L) {
- L = G(L)->mainthread; /* only the main thread can be closed */
- lua_lock(L);
- close_state(L);
-}
-
-
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