1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
** $Id: lstate.c,v 1.54 2001/01/25 16:45:36 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);
int islocked = 0;
#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;
}
struct Sopen {
int stacksize;
lua_State *L;
};
static void close_state (lua_State *L);
/*
** open parts that may cause memory-allocation errors
*/
static void f_luaopen (lua_State *L, void *ud) {
struct Sopen *so = (struct Sopen *)ud;
if (so->stacksize == 0)
so->stacksize = DEFAULT_STACK_SIZE;
else
so->stacksize += LUA_MINSTACK;
if (so->L != NULL) { /* shared global state? */
L->G = G(so->L);
L->gt = so->L->gt; /* share table of globals */
so->L->next->previous = L; /* insert L into linked list */
L->next = so->L->next;
so->L->next = L;
L->previous = so->L;
luaD_init(L, so->stacksize); /* init stack */
}
else { /* create a new global state */
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);
luaD_init(L, so->stacksize); /* init stack */
L->gt = luaH_new(L, 10); /* table of globals */
G(L)->type2tag = luaH_new(L, 10);
luaS_init(L);
luaX_init(L);
luaT_init(L);
G(L)->GCthreshold = 4*G(L)->nblocks;
LUA_UNLOCK; /* temporary exit to use the API */
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_LOCK; /* go back inside */
}
}
LUA_API lua_State *lua_open (lua_State *OL, int stacksize) {
struct Sopen so;
lua_State *L;
LUA_LOCK;
L = luaM_new(OL, lua_State);
if (L) { /* allocation OK? */
L->G = NULL;
L->stack = NULL;
L->stacksize = 0;
L->errorJmp = NULL;
L->callhook = NULL;
L->linehook = NULL;
L->allowhooks = 1;
L->next = L->previous = L;
so.stacksize = stacksize;
so.L = OL;
if (luaD_runprotected(L, f_luaopen, &so) != 0) {
/* memory allocation error: free partial state */
close_state(L);
L = NULL;
}
}
LUA_UNLOCK;
return L;
}
static void close_state (lua_State *L) {
lua_State *L1;
L1 = L->next; /* any surviving thread (if there is one) */
if (L1 == L) L1 = NULL; /* no surviving threads */
if (L1 != NULL) { /* are there other threads? */
lua_assert(L->previous != L);
L->previous->next = L->next;
L->next->previous = L->previous;
}
else if (G(L)) { /* last thread; 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(L1, L->stack, L->stacksize, TObject);
luaM_freelem(L1, L, lua_State);
}
LUA_API void lua_close (lua_State *L) {
lua_assert(L != lua_state || lua_gettop(L) == 0);
LUA_LOCK;
close_state(L);
LUA_UNLOCK;
lua_assert(L != lua_state || memdebug_numblocks == 0);
lua_assert(L != lua_state || memdebug_total == 0);
}
|
