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/*
** $Id: lstate.c,v 1.102 2002/08/06 15:32:22 roberto Exp roberto $
** Global State
** See Copyright Notice in lua.h
*/
#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"
static void close_state (lua_State *L);
/*
** you can change this function through the official API
** call `lua_setpanicf'
*/
static int default_panic (lua_State *L) {
UNUSED(L);
return 0;
}
static void stack_init (lua_State *L, lua_State *OL) {
L->stack = luaM_newvector(OL, BASIC_STACK_SIZE + EXTRA_STACK, TObject);
L->stacksize = BASIC_STACK_SIZE + EXTRA_STACK;
L->top = L->stack;
L->stack_last = L->stack+(L->stacksize - EXTRA_STACK)-1;
L->base_ci = luaM_newvector(OL, BASIC_CI_SIZE, CallInfo);
L->ci = L->base_ci;
L->ci->state = CI_C; /* not a Lua function */
setnilvalue(L->top++); /* `function' entry for this `ci' */
L->ci->base = L->top;
L->ci->top = L->top + LUA_MINSTACK;
L->size_ci = BASIC_CI_SIZE;
L->end_ci = L->base_ci + L->size_ci;
}
/*
** open parts that may cause memory-allocation errors
*/
static void f_luaopen (lua_State *L, void *ud) {
UNUSED(ud);
/* create a new global state */
L->l_G = luaM_new(L, global_State);
G(L)->GCthreshold = 0; /* mark it as unfinished state */
G(L)->strt.size = 0;
G(L)->strt.nuse = 0;
G(L)->strt.hash = NULL;
G(L)->Mbuffer = NULL;
G(L)->Mbuffsize = 0;
G(L)->panic = &default_panic;
G(L)->rootproto = NULL;
G(L)->rootcl = NULL;
G(L)->roottable = NULL;
G(L)->rootupval = NULL;
G(L)->rootudata = NULL;
G(L)->tmudata = NULL;
setnilvalue(key(G(L)->dummynode));
setnilvalue(val(G(L)->dummynode));
G(L)->dummynode->next = NULL;
G(L)->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 */
sethvalue(defaultmeta(L), NULL);
sethvalue(defaultmeta(L), luaH_new(L, 0, 4));
hvalue(defaultmeta(L))->metatable = hvalue(defaultmeta(L));
sethvalue(gt(L), luaH_new(L, 0, 4)); /* table of globals */
sethvalue(registry(L), luaH_new(L, 0, 0)); /* registry */
luaS_resize(L, MINSTRTABSIZE); /* initial size of string table */
luaT_init(L);
luaX_init(L);
luaS_fix(luaS_newliteral(L, MEMERRMSG));
G(L)->GCthreshold = 4*G(L)->nblocks;
}
static void preinit_state (lua_State *L) {
L->stack = NULL;
L->stacksize = 0;
L->errorJmp = NULL;
L->hook = NULL;
L->hookmask = 0;
setallowhook(L, 1);
resethookcount(L);
L->openupval = NULL;
L->size_ci = 0;
L->base_ci = L->ci = NULL;
L->errfunc = 0;
setnilvalue(defaultmeta(L));
setnilvalue(gt(L));
setnilvalue(registry(L));
}
LUA_API lua_State *lua_newthread (lua_State *OL) {
lua_State *L;
lua_lock(OL);
L = luaM_new(OL, lua_State);
preinit_state(L);
L->l_G = OL->l_G;
OL->next->previous = L; /* insert L into linked list */
L->next = OL->next;
OL->next = L;
L->previous = OL;
stack_init(L, OL); /* init stack */
setobj(defaultmeta(L), defaultmeta(OL)); /* share default meta table */
setobj(gt(L), gt(OL)); /* share table of globals */
setobj(registry(L), registry(OL)); /* share registry */
lua_unlock(OL);
lua_userstateopen(L);
return L;
}
LUA_API lua_State *lua_open (void) {
lua_State *L;
L = luaM_new(NULL, lua_State);
if (L) { /* allocation OK? */
preinit_state(L);
L->l_G = NULL;
L->next = L->previous = L;
if (luaD_rawrunprotected(L, f_luaopen, NULL) != 0) {
/* memory allocation error: free partial state */
close_state(L);
L = NULL;
}
}
lua_userstateopen(L);
return L;
}
void luaE_closethread (lua_State *OL, lua_State *L) {
luaF_close(L, L->stack); /* close all upvalues for this thread */
lua_assert(L->openupval == NULL);
L->previous->next = L->next;
L->next->previous = L->previous;
luaM_freearray(OL, L->base_ci, L->size_ci, CallInfo);
luaM_freearray(OL, L->stack, L->stacksize, TObject);
luaM_freelem(OL, L);
}
static void close_state (lua_State *L) {
luaF_close(L, L->stack); /* close all upvalues for this thread */
if (G(L)) { /* close global state */
luaC_collect(L, 1); /* collect all elements */
lua_assert(G(L)->rootproto == NULL);
lua_assert(G(L)->rootudata == NULL);
lua_assert(G(L)->rootcl == NULL);
lua_assert(G(L)->rootupval == NULL);
lua_assert(G(L)->roottable == NULL);
luaS_freeall(L);
luaM_freearray(L, G(L)->Mbuffer, G(L)->Mbuffsize, char);
luaM_freelem(NULL, L->l_G);
}
luaE_closethread(NULL, L);
}
LUA_API void lua_closethread (lua_State *L, lua_State *thread) {
lua_lock(L);
if (L == thread) luaG_runerror(L, "cannot close only thread of a state");
luaE_closethread(L, thread);
lua_unlock(L);
}
LUA_API void lua_close (lua_State *L) {
lua_lock(L);
luaC_callallgcTM(L); /* call GC tag methods for all udata */
lua_assert(G(L)->tmudata == NULL);
while (L->next != L) /* then, close all other threads */
luaE_closethread(L, L->next);
close_state(L);
}
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