2812
|
1 |
/*
|
|
2 |
** $Id: lstate.c,v 2.36.1.2 2008/01/03 15:20:39 roberto Exp $
|
|
3 |
** Global State
|
|
4 |
** See Copyright Notice in lua.h
|
|
5 |
*/
|
|
6 |
|
|
7 |
|
|
8 |
#include <stddef.h>
|
|
9 |
|
|
10 |
#define lstate_c
|
|
11 |
#define LUA_CORE
|
|
12 |
|
|
13 |
#include "lua.h"
|
|
14 |
|
|
15 |
#include "ldebug.h"
|
|
16 |
#include "ldo.h"
|
|
17 |
#include "lfunc.h"
|
|
18 |
#include "lgc.h"
|
|
19 |
#include "llex.h"
|
|
20 |
#include "lmem.h"
|
|
21 |
#include "lstate.h"
|
|
22 |
#include "lstring.h"
|
|
23 |
#include "ltable.h"
|
|
24 |
#include "ltm.h"
|
|
25 |
|
|
26 |
|
10017
|
27 |
#define state_size(x) (sizeof(x) + LUAI_EXTRASPACE)
|
|
28 |
#define fromstate(l) (cast(lu_byte *, (l)) - LUAI_EXTRASPACE)
|
2812
|
29 |
#define tostate(l) (cast(lua_State *, cast(lu_byte *, l) + LUAI_EXTRASPACE))
|
|
30 |
|
|
31 |
|
|
32 |
/*
|
|
33 |
** Main thread combines a thread state and the global state
|
|
34 |
*/
|
|
35 |
typedef struct LG {
|
|
36 |
lua_State l;
|
|
37 |
global_State g;
|
|
38 |
} LG;
|
3697
|
39 |
|
2812
|
40 |
|
|
41 |
|
|
42 |
static void stack_init (lua_State *L1, lua_State *L) {
|
|
43 |
/* initialize CallInfo array */
|
|
44 |
L1->base_ci = luaM_newvector(L, BASIC_CI_SIZE, CallInfo);
|
|
45 |
L1->ci = L1->base_ci;
|
|
46 |
L1->size_ci = BASIC_CI_SIZE;
|
|
47 |
L1->end_ci = L1->base_ci + L1->size_ci - 1;
|
|
48 |
/* initialize stack array */
|
|
49 |
L1->stack = luaM_newvector(L, BASIC_STACK_SIZE + EXTRA_STACK, TValue);
|
|
50 |
L1->stacksize = BASIC_STACK_SIZE + EXTRA_STACK;
|
|
51 |
L1->top = L1->stack;
|
|
52 |
L1->stack_last = L1->stack+(L1->stacksize - EXTRA_STACK)-1;
|
|
53 |
/* initialize first ci */
|
|
54 |
L1->ci->func = L1->top;
|
|
55 |
setnilvalue(L1->top++); /* `function' entry for this `ci' */
|
|
56 |
L1->base = L1->ci->base = L1->top;
|
|
57 |
L1->ci->top = L1->top + LUA_MINSTACK;
|
|
58 |
}
|
|
59 |
|
|
60 |
|
|
61 |
static void freestack (lua_State *L, lua_State *L1) {
|
|
62 |
luaM_freearray(L, L1->base_ci, L1->size_ci, CallInfo);
|
|
63 |
luaM_freearray(L, L1->stack, L1->stacksize, TValue);
|
|
64 |
}
|
|
65 |
|
|
66 |
|
|
67 |
/*
|
|
68 |
** open parts that may cause memory-allocation errors
|
|
69 |
*/
|
|
70 |
static void f_luaopen (lua_State *L, void *ud) {
|
|
71 |
global_State *g = G(L);
|
|
72 |
UNUSED(ud);
|
|
73 |
stack_init(L, L); /* init stack */
|
|
74 |
sethvalue(L, gt(L), luaH_new(L, 0, 2)); /* table of globals */
|
|
75 |
sethvalue(L, registry(L), luaH_new(L, 0, 2)); /* registry */
|
|
76 |
luaS_resize(L, MINSTRTABSIZE); /* initial size of string table */
|
|
77 |
luaT_init(L);
|
|
78 |
luaX_init(L);
|
|
79 |
luaS_fix(luaS_newliteral(L, MEMERRMSG));
|
|
80 |
g->GCthreshold = 4*g->totalbytes;
|
|
81 |
}
|
|
82 |
|
|
83 |
|
|
84 |
static void preinit_state (lua_State *L, global_State *g) {
|
|
85 |
G(L) = g;
|
|
86 |
L->stack = NULL;
|
|
87 |
L->stacksize = 0;
|
|
88 |
L->errorJmp = NULL;
|
|
89 |
L->hook = NULL;
|
|
90 |
L->hookmask = 0;
|
|
91 |
L->basehookcount = 0;
|
|
92 |
L->allowhook = 1;
|
|
93 |
resethookcount(L);
|
|
94 |
L->openupval = NULL;
|
|
95 |
L->size_ci = 0;
|
|
96 |
L->nCcalls = L->baseCcalls = 0;
|
|
97 |
L->status = 0;
|
|
98 |
L->base_ci = L->ci = NULL;
|
|
99 |
L->savedpc = NULL;
|
|
100 |
L->errfunc = 0;
|
|
101 |
setnilvalue(gt(L));
|
|
102 |
}
|
|
103 |
|
|
104 |
|
|
105 |
static void close_state (lua_State *L) {
|
|
106 |
global_State *g = G(L);
|
|
107 |
luaF_close(L, L->stack); /* close all upvalues for this thread */
|
|
108 |
luaC_freeall(L); /* collect all objects */
|
|
109 |
lua_assert(g->rootgc == obj2gco(L));
|
|
110 |
lua_assert(g->strt.nuse == 0);
|
|
111 |
luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size, TString *);
|
|
112 |
luaZ_freebuffer(L, &g->buff);
|
|
113 |
freestack(L, L);
|
|
114 |
lua_assert(g->totalbytes == sizeof(LG));
|
|
115 |
(*g->frealloc)(g->ud, fromstate(L), state_size(LG), 0);
|
|
116 |
}
|
|
117 |
|
|
118 |
|
|
119 |
lua_State *luaE_newthread (lua_State *L) {
|
|
120 |
lua_State *L1 = tostate(luaM_malloc(L, state_size(lua_State)));
|
|
121 |
luaC_link(L, obj2gco(L1), LUA_TTHREAD);
|
|
122 |
preinit_state(L1, G(L));
|
|
123 |
stack_init(L1, L); /* init stack */
|
|
124 |
setobj2n(L, gt(L1), gt(L)); /* share table of globals */
|
|
125 |
L1->hookmask = L->hookmask;
|
|
126 |
L1->basehookcount = L->basehookcount;
|
|
127 |
L1->hook = L->hook;
|
|
128 |
resethookcount(L1);
|
|
129 |
lua_assert(iswhite(obj2gco(L1)));
|
|
130 |
return L1;
|
|
131 |
}
|
|
132 |
|
|
133 |
|
|
134 |
void luaE_freethread (lua_State *L, lua_State *L1) {
|
|
135 |
luaF_close(L1, L1->stack); /* close all upvalues for this thread */
|
|
136 |
lua_assert(L1->openupval == NULL);
|
|
137 |
luai_userstatefree(L1);
|
|
138 |
freestack(L, L1);
|
|
139 |
luaM_freemem(L, fromstate(L1), state_size(lua_State));
|
|
140 |
}
|
|
141 |
|
|
142 |
|
|
143 |
LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
|
|
144 |
int i;
|
|
145 |
lua_State *L;
|
|
146 |
global_State *g;
|
|
147 |
void *l = (*f)(ud, NULL, 0, state_size(LG));
|
|
148 |
if (l == NULL) return NULL;
|
|
149 |
L = tostate(l);
|
|
150 |
g = &((LG *)L)->g;
|
|
151 |
L->next = NULL;
|
|
152 |
L->tt = LUA_TTHREAD;
|
|
153 |
g->currentwhite = bit2mask(WHITE0BIT, FIXEDBIT);
|
|
154 |
L->marked = luaC_white(g);
|
|
155 |
set2bits(L->marked, FIXEDBIT, SFIXEDBIT);
|
|
156 |
preinit_state(L, g);
|
|
157 |
g->frealloc = f;
|
|
158 |
g->ud = ud;
|
|
159 |
g->mainthread = L;
|
|
160 |
g->uvhead.u.l.prev = &g->uvhead;
|
|
161 |
g->uvhead.u.l.next = &g->uvhead;
|
|
162 |
g->GCthreshold = 0; /* mark it as unfinished state */
|
|
163 |
g->strt.size = 0;
|
|
164 |
g->strt.nuse = 0;
|
|
165 |
g->strt.hash = NULL;
|
|
166 |
setnilvalue(registry(L));
|
|
167 |
luaZ_initbuffer(L, &g->buff);
|
|
168 |
g->panic = NULL;
|
|
169 |
g->gcstate = GCSpause;
|
|
170 |
g->rootgc = obj2gco(L);
|
|
171 |
g->sweepstrgc = 0;
|
|
172 |
g->sweepgc = &g->rootgc;
|
|
173 |
g->gray = NULL;
|
|
174 |
g->grayagain = NULL;
|
|
175 |
g->weak = NULL;
|
|
176 |
g->tmudata = NULL;
|
|
177 |
g->totalbytes = sizeof(LG);
|
|
178 |
g->gcpause = LUAI_GCPAUSE;
|
|
179 |
g->gcstepmul = LUAI_GCMUL;
|
|
180 |
g->gcdept = 0;
|
|
181 |
for (i=0; i<NUM_TAGS; i++) g->mt[i] = NULL;
|
|
182 |
if (luaD_rawrunprotected(L, f_luaopen, NULL) != 0) {
|
|
183 |
/* memory allocation error: free partial state */
|
|
184 |
close_state(L);
|
|
185 |
L = NULL;
|
|
186 |
}
|
|
187 |
else
|
|
188 |
luai_userstateopen(L);
|
|
189 |
return L;
|
|
190 |
}
|
|
191 |
|
|
192 |
|
|
193 |
static void callallgcTM (lua_State *L, void *ud) {
|
|
194 |
UNUSED(ud);
|
|
195 |
luaC_callGCTM(L); /* call GC metamethods for all udata */
|
|
196 |
}
|
|
197 |
|
|
198 |
|
|
199 |
LUA_API void lua_close (lua_State *L) {
|
|
200 |
L = G(L)->mainthread; /* only the main thread can be closed */
|
|
201 |
lua_lock(L);
|
|
202 |
luaF_close(L, L->stack); /* close all upvalues for this thread */
|
|
203 |
luaC_separateudata(L, 1); /* separate udata that have GC metamethods */
|
|
204 |
L->errfunc = 0; /* no error function during GC metamethods */
|
|
205 |
do { /* repeat until no more errors */
|
|
206 |
L->ci = L->base_ci;
|
|
207 |
L->base = L->top = L->ci->base;
|
|
208 |
L->nCcalls = L->baseCcalls = 0;
|
|
209 |
} while (luaD_rawrunprotected(L, callallgcTM, NULL) != 0);
|
|
210 |
lua_assert(G(L)->tmudata == NULL);
|
|
211 |
luai_userstateclose(L);
|
|
212 |
close_state(L);
|
|
213 |
}
|
|
214 |
|