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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
/*
** $Id: lstate.c,v 1.2 2004/03/23 05:09:14 jbj Exp $
** Global State
** See Copyright Notice in lua.h
*/
#include <stdlib.h>
#define lstate_c
#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"
/*
** macro to allow the inclusion of user information in Lua state
*/
#ifndef LUA_USERSTATE
#define EXTRASPACE 0
#else
union UEXTRASPACE {L_Umaxalign a; LUA_USERSTATE b;};
#define EXTRASPACE (sizeof(union UEXTRASPACE))
#endif
/*
** you can change this function through the official API:
** call `lua_setpanicf'
*/
static int default_panic (lua_State *L)
{
UNUSED(L);
return 0;
}
static lua_State *mallocstate (lua_State *L)
{
lu_byte *block = (lu_byte *)luaM_malloc(L, sizeof(lua_State) + EXTRASPACE);
if (block == NULL) return NULL;
else {
block += EXTRASPACE;
return cast(lua_State *, block);
}
}
static void freestate (lua_State *L, lua_State *L1)
{
luaM_free(L, cast(lu_byte *, L1) - EXTRASPACE,
sizeof(lua_State) + EXTRASPACE);
}
static void stack_init (lua_State *L1, lua_State *L)
{
L1->stack = luaM_newvector(L, BASIC_STACK_SIZE + EXTRA_STACK, TObject);
L1->stacksize = BASIC_STACK_SIZE + EXTRA_STACK;
L1->top = L1->stack;
L1->stack_last = L1->stack+(L1->stacksize - EXTRA_STACK)-1;
L1->base_ci = luaM_newvector(L, BASIC_CI_SIZE, CallInfo);
L1->ci = L1->base_ci;
L1->ci->state = CI_C; /* not a Lua function */
setnilvalue(L1->top++); /* `function' entry for this `ci' */
L1->base = L1->ci->base = L1->top;
L1->ci->top = L1->top + LUA_MINSTACK;
L1->size_ci = BASIC_CI_SIZE;
L1->end_ci = L1->base_ci + L1->size_ci;
}
static void freestack (lua_State *L, lua_State *L1)
{
luaM_freearray(L, L1->base_ci, L1->size_ci, CallInfo);
luaM_freearray(L, L1->stack, L1->stacksize, TObject);
}
/*
** 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;
}
static void preinit_state (lua_State *L)
{
L->stack = NULL;
L->stacksize = 0;
L->errorJmp = NULL;
L->hook = NULL;
L->hookmask = L->hookinit = 0;
L->basehookcount = 0;
L->allowhook = 1;
resethookcount(L);
L->openupval = NULL;
L->size_ci = 0;
L->nCcalls = 0;
L->ci = L->base_ci = NULL;
L->errfunc = 0;
setnilvalue(gt(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_sweep(L, 1); /* collect all elements */
lua_assert(G(L)->rootgc == NULL);
lua_assert(G(L)->rootudata == NULL);
luaS_freeall(L);
luaZ_freebuffer(L, &G(L)->buff);
}
freestack(L, L);
if (G(L)) {
lua_assert(G(L)->nblocks == sizeof(lua_State) + sizeof(global_State));
luaM_freelem(NULL, G(L));
}
freestate(NULL, L);
}
lua_State *luaE_newthread (lua_State *L) {
lua_State *L1 = mallocstate(L);
luaC_link(L, valtogco(L1), LUA_TTHREAD);
preinit_state(L1);
L1->l_G = L->l_G;
stack_init(L1, L); /* init stack */
setobj2n(gt(L1), gt(L)); /* share table of globals */
return L1;
}
void luaE_freethread (lua_State *L, lua_State *L1) {
luaF_close(L1, L1->stack); /* close all upvalues for this thread */
lua_assert(L1->openupval == NULL);
freestack(L, L1);
freestate(L, L1);
}
LUA_API lua_State *lua_open (void) {
lua_State *L = mallocstate(NULL);
if (L) { /* allocation OK? */
L->tt = LUA_TTHREAD;
L->marked = 0;
L->next = L->gclist = NULL;
preinit_state(L);
L->l_G = NULL;
if (luaD_rawrunprotected(L, f_luaopen, NULL) != 0) {
/* memory allocation error: free partial state */
close_state(L);
L = NULL;
}
}
lua_userstateopen(L);
return L;
}
static void callallgcTM (lua_State *L, void *ud)
{
UNUSED(ud);
luaC_callGCTM(L); /* call GC metamethods for all udata */
}
LUA_API void lua_close (lua_State *L) {
lua_lock(L);
L = G(L)->mainthread; /* only the main thread can be closed */
luaF_close(L, L->stack); /* close all upvalues for this thread */
luaC_separateudata(L); /* separate udata that have GC metamethods */
L->errfunc = 0; /* no error function during GC metamethods */
do { /* repeat until no more errors */
L->ci = L->base_ci;
L->base = L->top = L->ci->base;
L->nCcalls = 0;
} while (luaD_rawrunprotected(L, callallgcTM, NULL) != 0);
lua_assert(G(L)->tmudata == NULL);
close_state(L);
}
|
