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/*
** $Id: lstate.c,v 1.50 2000/12/28 12:55:41 roberto Exp roberto $
** Global State
** See Copyright Notice in lua.h
*/
#include <stdio.h>
#include "lua.h"
#include "ldo.h"
#include "lgc.h"
#include "llex.h"
#include "lmem.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
#ifdef LUA_DEBUG
static lua_State *lua_state = NULL;
void luaB_opentests (lua_State *L);
#endif
/*
** built-in implementation for ERRORMESSAGE. In a "correct" environment
** ERRORMESSAGE should have an external definition, and so this function
** would not be used.
*/
static int errormessage (lua_State *L) {
const char *s = lua_tostring(L, 1);
if (s == NULL) s = "(no message)";
fprintf(stderr, "error: %s\n", s);
return 0;
}
/*
** open parts that may cause memory-allocation errors
*/
static void f_luaopen (lua_State *L, void *ud) {
int stacksize = *(int *)ud;
if (stacksize == 0)
stacksize = DEFAULT_STACK_SIZE;
else
stacksize += LUA_MINSTACK;
L->G = luaM_new(L, global_State);
G(L)->strt.size = G(L)->udt.size = 0;
G(L)->strt.nuse = G(L)->udt.nuse = 0;
G(L)->strt.hash = G(L)->udt.hash = NULL;
G(L)->Mbuffer = NULL;
G(L)->Mbuffsize = 0;
G(L)->rootproto = NULL;
G(L)->rootcl = NULL;
G(L)->roottable = NULL;
G(L)->TMtable = NULL;
G(L)->sizeTM = 0;
G(L)->ntag = 0;
G(L)->refArray = NULL;
G(L)->nref = 0;
G(L)->sizeref = 0;
G(L)->refFree = NONEXT;
G(L)->nblocks = sizeof(lua_State) + sizeof(global_State);
G(L)->GCthreshold = MAX_INT; /* to avoid GC during pre-definitions */
L->gt = luaH_new(L, 10); /* table of globals */
luaD_init(L, stacksize);
luaS_init(L);
luaX_init(L);
luaT_init(L);
lua_newtable(L);
lua_ref(L, 1); /* create registry */
lua_register(L, LUA_ERRORMESSAGE, errormessage);
#ifdef LUA_DEBUG
luaB_opentests(L);
if (lua_state == NULL) lua_state = L; /* keep first state to be opened */
lua_assert(lua_gettop(L) == 0);
#endif
}
LUA_API lua_State *lua_open (int stacksize) {
lua_State *L;
L = luaM_new(NULL, lua_State);
if (L == NULL) return NULL; /* memory allocation error */
L->G = NULL;
L->stack = NULL;
L->stacksize = 0;
L->errorJmp = NULL;
L->callhook = NULL;
L->linehook = NULL;
L->allowhooks = 1;
if (luaD_runprotected(L, f_luaopen, &stacksize) != 0) {
/* memory allocation error: free partial state */
lua_close(L);
return NULL;
}
G(L)->GCthreshold = 2*G(L)->nblocks;
return L;
}
LUA_API void lua_close (lua_State *L) {
lua_assert(L != lua_state || lua_gettop(L) == 0);
if (G(L)) { /* close global state */
luaC_collect(L, 1); /* collect all elements */
lua_assert(G(L)->rootproto == NULL);
lua_assert(G(L)->rootcl == NULL);
lua_assert(G(L)->roottable == NULL);
luaS_freeall(L);
luaM_freearray(L, G(L)->TMtable, G(L)->sizeTM, struct TM);
luaM_freearray(L, G(L)->refArray, G(L)->sizeref, struct Ref);
luaM_freearray(L, G(L)->Mbuffer, G(L)->Mbuffsize, char);
luaM_freelem(NULL, L->G, global_State);
}
luaM_freearray(NULL, L->stack, L->stacksize, TObject);
luaM_freelem(NULL, L, lua_State);
lua_assert(L != lua_state || memdebug_numblocks == 0);
lua_assert(L != lua_state || memdebug_total == 0);
}
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