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/*
** $Id: lstate.c,v 1.39 2000/09/12 18:42:32 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 DEBUG
extern lua_State *lua_state;
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;
}
lua_State *lua_open (int stacksize) {
struct lua_longjmp myErrorJmp;
lua_State *L = luaM_new(NULL, lua_State);
if (L == NULL) return NULL; /* memory allocation error */
L->stack = NULL;
L->strt.size = L->udt.size = 0;
L->strt.nuse = L->udt.nuse = 0;
L->strt.hash = NULL;
L->udt.hash = NULL;
L->Mbuffer = NULL;
L->Mbuffsize = 0;
L->rootproto = NULL;
L->rootcl = NULL;
L->roottable = NULL;
L->IMtable = NULL;
L->last_tag = -1;
L->refArray = NULL;
L->refSize = 0;
L->refFree = NONEXT;
L->nblocks = 0;
L->GCthreshold = MAX_INT; /* to avoid GC during pre-definitions */
L->callhook = NULL;
L->linehook = NULL;
L->allowhooks = 1;
L->errorJmp = &myErrorJmp;
if (setjmp(myErrorJmp.b) == 0) { /* to catch memory allocation errors */
L->gt = luaH_new(L, 10);
luaD_init(L, (stacksize == 0) ? DEFAULT_STACK_SIZE :
stacksize+LUA_MINSTACK);
luaS_init(L);
luaX_init(L);
luaT_init(L);
lua_register(L, LUA_ERRORMESSAGE, errormessage);
#ifdef DEBUG
luaB_opentests(L);
#endif
L->GCthreshold = L->nblocks*4;
L->errorJmp = NULL;
return L;
}
else { /* memory allocation error: free partial state */
lua_close(L);
return NULL;
}
}
void lua_close (lua_State *L) {
luaC_collect(L, 1); /* collect all elements */
LUA_ASSERT(L->rootproto == NULL, "list should be empty");
LUA_ASSERT(L->rootcl == NULL, "list should be empty");
LUA_ASSERT(L->roottable == NULL, "list should be empty");
luaS_freeall(L);
luaM_free(L, L->stack);
luaM_free(L, L->IMtable);
luaM_free(L, L->refArray);
luaM_free(L, L->Mbuffer);
LUA_ASSERT(L->nblocks == 0, "wrong count for nblocks");
luaM_free(L, L);
LUA_ASSERT(L != lua_state || memdebug_numblocks == 0, "memory leak!");
LUA_ASSERT(L != lua_state || memdebug_total == 0,"memory leak!");
}
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