/*
** open parts that may cause memory-allocation errors
*/
static void f_luaopen (lua_State *L, void *ud) {
/* create a new global state */
global_State *g = luaM_new(NULL, global_State);
UNUSED(ud);
if (g == NULL) luaD_throw(L, LUA_ERRMEM);
L->l_G = g;
g->mainthread = L;
g->GCthreshold = 0; /* mark it as unfinished state */
g->strt.size = 0;
g->strt.nuse = 0;
g->strt.hash = NULL;
setnilvalue(defaultmeta(L));
setnilvalue(registry(L));
luaZ_initbuffer(L, &g->buff);
g->panic = default_panic;
g->rootgc = NULL;
g->rootudata = NULL;
g->tmudata = NULL;
setnilvalue(gkey(g->dummynode));
setnilvalue(gval(g->dummynode));
g->dummynode->next = NULL;
g->nblocks = sizeof(lua_State) + sizeof(global_State);
stack_init(L, L); /* init stack */
/* create default meta table with a dummy table, and then close the loop */
defaultmeta(L)->tt = LUA_TTABLE;
sethvalue(defaultmeta(L), luaH_new(L, 0, 0));
hvalue(defaultmeta(L))->metatable = hvalue(defaultmeta(L));
sethvalue(gt(L), luaH_new(L, 0, 4)); /* table of globals */
sethvalue(registry(L), luaH_new(L, 4, 4)); /* 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(L)->nblocks;
}
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);
/* SPRING additions, default to disabled functions */
g->fopen_func = NULL;
g->popen_func = NULL;
g->pclose_func = NULL;
g->system_func = NULL;
g->remove_func = NULL;
g->rename_func = NULL;
return L;
}
LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
int i;
lua_State *L;
global_State *g;
/* cast -> llimits.h line 93 是一个宏*/
/* f -> lauxlib.c l_alloc */
LG *l = cast(LG *, (*f)(ud, NULL, LUA_TTHREAD, sizeof(LG))); /* -> LG *l = (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 = lua_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;
}
else
luai_userstateopen(L);
return L;
}
/*
** dump Lua function as precompiled chunk
*/
int luaU_dump (lua_State* L, const Proto* f, lua_Writer w, void* data, int strip, char endian)
{
DumpState D;
D.L=L;
D.writer=w;
D.data=data;
D.strip=strip;
D.status=0;
D.swap=doendian(endian);
D.endian=endian;
luaZ_initbuffer(L, &D.b);
DumpHeader(&D);
DumpFunction(f,NULL,&D);
luaZ_freebuffer(L, &D.b);
return D.status;
}
/**
* 创建主线程 和 gloable_state, 初始化其结构; 接着开始进行分配内存, 若分配
* 内存出错, 则 close 该 lua_state (以确保释放已分配的内存), 并返回 NULL.
*
* luaL_newstate 函数封装了这个函数，lauxlib.c 中提供了一个 lua_Alloc 函数
*/
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 = bitmask(WHITE0BIT);
L->marked = luaC_white(g);
preinit_thread(L, g);
g->frealloc = f;
g->ud = ud;
g->mainthread = L;
g->seed = makeseed(L);
g->gcrunning = 0; /* no GC while building state */
g->GCestimate = 0;
g->strt.size = 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->gckind = KGC_NORMAL;
g->allgc = g->finobj = g->tobefnz = g->fixedgc = NULL;
g->sweepgc = NULL;
g->gray = g->grayagain = NULL;
g->weak = g->ephemeron = g->allweak = NULL;
g->twups = NULL;
g->totalbytes = sizeof(LG);
g->GCdebt = 0;
g->gcfinnum = 0;
g->gcpause = LUAI_GCPAUSE;
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 */
Dlog("lua state init error, free partial state.")
close_state(L);
L = NULL;
}
return L;
}
LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
int i;
lua_State *L;
global_State *g;
#if LUAPLUS_EXTENSIONS
void *l = (*f)(ud, NULL, 0, state_size(LG), "lua_State", 0);
#else
void *l = (*f)(ud, NULL, 0, state_size(LG));
#endif /* LUAPLUS_EXTENSIONS */
if (l == NULL) return NULL;
L = tostate(l);
g = &((LG *)L)->g;
L->next = NULL;
#if LUA_REFCOUNT
L->prev = NULL;
#endif /* LUA_REFCOUNT */
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;
#if LUA_REFCOUNT
setnilvalue2n(L, registry(L));
#else
setnilvalue(registry(L));
#endif /* LUA_REFCOUNT */
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;
#if LUAPLUS_EXTENSIONS
g->loadNotifyFunction = NULL;
g->userGCFunction = NULL;
g->gchead_next = &g->gctail_next;
g->gchead_prev = NULL;
g->gctail_next = NULL;
g->gctail_prev = &g->gchead_next;
#endif /* LUAPLUS_EXTENSIONS */
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;
}
/*
** open parts that may cause memory-allocation errors
*/
static void f_luaopen (lua_State *L, void *ud) {
int i;
global_State globalState;
lua_State luaState;
global_State *g;
#ifdef _DEBUG
luaState.allocName = "Lua_global_State";
#endif _DEBUG
luaState.l_G = &globalState;
globalState.reallocFunc = luaHelper_Realloc;
globalState.freeFunc = luaHelper_Free;
globalState.memData = luaHelper_memData;
globalState.nblocks = sizeof(lua_State) + sizeof(global_State); // Bogus.
/* create a new global state */
g = luaM_new(&luaState, global_State);
UNUSED(ud);
if (g == NULL) luaD_throw(L, LUA_ERRMEM);
L->l_G = g;
g->mainthread = L;
g->GCthreshold = 0; /* mark it as unfinished state */
g->strt.size = 0;
g->strt.nuse = 0;
g->strt.hash = NULL;
setnilvalue2n(defaultmeta(L));
setnilvalue2n(registry(L));
luaZ_initbuffer(L, &g->buff);
g->panic = default_panic;
#if !LUA_REFCOUNT
g->rootgc = NULL;
g->rootudata = NULL;
g->tmudata = NULL;
#else LUA_REFCOUNT
g->rootgc_head.next = (GCObject*)&g->rootgc_tail;
g->rootgc_head.prev = NULL;
g->rootgc_tail.next = NULL;
g->rootgc_tail.prev = (GCObject*)&g->rootgc_head;
g->rootgc_head.tt = LUA_TNIL;
g->rootgc_head.marked = 0;
g->rootgc_head.ref = 0;
g->rootgc_tail.tt = LUA_TNIL;
g->rootgc_tail.marked = 0;
g->rootgc_tail.ref = 0;
g->rootudata_head.next = (GCObject*)&g->rootudata_tail;
g->rootudata_head.prev = NULL;
g->rootudata_tail.next = NULL;
g->rootudata_tail.prev = (GCObject*)&g->rootudata_head;
g->rootudata_head.tt = LUA_TNIL;
g->rootudata_head.marked = 0;
g->rootudata_head.ref = 0;
g->rootudata_tail.tt = LUA_TNIL;
g->rootudata_tail.marked = 0;
g->rootudata_tail.ref = 0;
g->tmudata_head.next = (GCObject*)&g->tmudata_tail;
g->tmudata_head.prev = NULL;
g->tmudata_tail.next = NULL;
g->tmudata_tail.prev = (GCObject*)&g->tmudata_head;
g->tmudata_head.tt = LUA_TNIL;
g->tmudata_head.marked = 0;
g->tmudata_head.ref = 0;
g->tmudata_tail.tt = LUA_TNIL;
g->tmudata_tail.marked = 0;
g->tmudata_tail.ref = 0;
#endif LUA_REFCOUNT
setnilvalue2n(gkey(g->dummynode));
setnilvalue2n(gval(g->dummynode));
g->dummynode->next = NULL;
g->nblocks = sizeof(lua_State) + sizeof(global_State);
g->reallocFunc = luaHelper_Realloc;
g->freeFunc = luaHelper_Free;
g->memData = luaHelper_memData;
g->fatalErrorFunc = defaultFatalErrorFunc;
#ifdef LUA_MTSUPPORT
g->lockData = NULL;
g->lockFunc = NULL;
g->unlockFunc = NULL;
#endif LUA_MTSUPPORT
g->userGCFunction = NULL;
g->globalUserData = NULL;
stack_init(L, L); /* init stack */
for (i = 0; i < LUA_NTYPES; i++)
{
defaultmetatypes(L, i)->value.gc = NULL;
}
/* create default meta table with a dummy table, and then close the loop */
defaultmeta(L)->tt = LUA_TNUMBER;
defaultmeta(L)->value.gc = NULL;
sethvalue2n(defaultmeta(L), luaH_new(L, 0, 0));
__AddRefDirect(hvalue(defaultmeta(L)));
hvalue(defaultmeta(L))->metatable = hvalue(defaultmeta(L));
__AddRefDirect(hvalue(defaultmeta(L))->metatable);
/* build meta tables */
for (i = 0; i < LUA_NTYPES; i++)
{
luaM_setname(L, "Lua_defaultMetaTypes");
sethvalue2n(defaultmetatypes(L, i), luaH_new(L, 0, 0));
hvalue(defaultmetatypes(L, i))->metatable = hvalue(defaultmeta(L));
}
luaM_setname(L, "Lua_Globals");
sethvalue(gt(L), luaH_new(L, 0, 4)); /* table of globals */
__AddRefDirect(hvalue(gt(L)));
luaM_setname(L, "Lua_Registry");
sethvalue(registry(L), luaH_new(L, 4, 4)); /* registry */
__AddRef(registry(L));
g->minimumstrings = lua_minimumnumstrings;
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(L)->nblocks;
luaZ_openspace(L, &g->buff, lua_minimumauxspace);
}