Line data Source code
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 :
27 : #define state_size(x) (sizeof(x) + LUAI_EXTRASPACE)
28 : #define fromstate(l) (cast(lu_byte *, (l)) - LUAI_EXTRASPACE)
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;
39 :
40 :
41 :
42 119 : static void stack_init (lua_State *L1, lua_State *L) {
43 : /* initialize CallInfo array */
44 119 : L1->base_ci = luaM_newvector(L, BASIC_CI_SIZE, CallInfo);
45 119 : L1->ci = L1->base_ci;
46 119 : L1->size_ci = BASIC_CI_SIZE;
47 119 : L1->end_ci = L1->base_ci + L1->size_ci - 1;
48 : /* initialize stack array */
49 119 : L1->stack = luaM_newvector(L, BASIC_STACK_SIZE + EXTRA_STACK, TValue);
50 119 : L1->stacksize = BASIC_STACK_SIZE + EXTRA_STACK;
51 119 : L1->top = L1->stack;
52 119 : L1->stack_last = L1->stack+(L1->stacksize - EXTRA_STACK)-1;
53 : /* initialize first ci */
54 119 : L1->ci->func = L1->top;
55 119 : setnilvalue(L1->top++); /* `function' entry for this `ci' */
56 119 : L1->base = L1->ci->base = L1->top;
57 119 : L1->ci->top = L1->top + LUA_MINSTACK;
58 119 : }
59 :
60 :
61 109 : static void freestack (lua_State *L, lua_State *L1) {
62 109 : luaM_freearray(L, L1->base_ci, L1->size_ci, CallInfo);
63 109 : luaM_freearray(L, L1->stack, L1->stacksize, TValue);
64 109 : }
65 :
66 :
67 : /*
68 : ** open parts that may cause memory-allocation errors
69 : */
70 95 : static void f_luaopen (lua_State *L, void *ud) {
71 95 : global_State *g = G(L);
72 : UNUSED(ud);
73 95 : stack_init(L, L); /* init stack */
74 95 : sethvalue(L, gt(L), luaH_new(L, 0, 2)); /* table of globals */
75 95 : sethvalue(L, registry(L), luaH_new(L, 0, 2)); /* registry */
76 95 : luaS_resize(L, MINSTRTABSIZE); /* initial size of string table */
77 95 : luaT_init(L);
78 95 : luaX_init(L);
79 95 : luaS_fix(luaS_newliteral(L, MEMERRMSG));
80 95 : g->GCthreshold = 4*g->totalbytes;
81 95 : }
82 :
83 :
84 119 : static void preinit_state (lua_State *L, global_State *g) {
85 119 : G(L) = g;
86 119 : L->stack = NULL;
87 119 : L->stacksize = 0;
88 119 : L->errorJmp = NULL;
89 119 : L->hook = NULL;
90 119 : L->hookmask = 0;
91 119 : L->basehookcount = 0;
92 119 : L->allowhook = 1;
93 119 : resethookcount(L);
94 119 : L->openupval = NULL;
95 119 : L->size_ci = 0;
96 119 : L->nCcalls = L->baseCcalls = 0;
97 119 : L->status = 0;
98 119 : L->base_ci = L->ci = NULL;
99 119 : L->savedpc = NULL;
100 119 : L->errfunc = 0;
101 119 : setnilvalue(gt(L));
102 119 : }
103 :
104 :
105 85 : static void close_state (lua_State *L) {
106 85 : global_State *g = G(L);
107 85 : luaF_close(L, L->stack); /* close all upvalues for this thread */
108 85 : luaC_freeall(L); /* collect all objects */
109 : lua_assert(g->rootgc == obj2gco(L));
110 : lua_assert(g->strt.nuse == 0);
111 85 : luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size, TString *);
112 85 : luaZ_freebuffer(L, &g->buff);
113 85 : freestack(L, L);
114 : lua_assert(g->totalbytes == sizeof(LG));
115 85 : (*g->frealloc)(g->ud, fromstate(L), state_size(LG), 0);
116 85 : }
117 :
118 :
119 24 : lua_State *luaE_newthread (lua_State *L) {
120 24 : lua_State *L1 = tostate(luaM_malloc(L, state_size(lua_State)));
121 24 : luaC_link(L, obj2gco(L1), LUA_TTHREAD);
122 24 : preinit_state(L1, G(L));
123 24 : stack_init(L1, L); /* init stack */
124 24 : setobj2n(L, gt(L1), gt(L)); /* share table of globals */
125 24 : L1->hookmask = L->hookmask;
126 24 : L1->basehookcount = L->basehookcount;
127 24 : L1->hook = L->hook;
128 24 : resethookcount(L1);
129 : lua_assert(iswhite(obj2gco(L1)));
130 24 : return L1;
131 : }
132 :
133 :
134 24 : void luaE_freethread (lua_State *L, lua_State *L1) {
135 24 : luaF_close(L1, L1->stack); /* close all upvalues for this thread */
136 : lua_assert(L1->openupval == NULL);
137 : luai_userstatefree(L1);
138 24 : freestack(L, L1);
139 24 : luaM_freemem(L, fromstate(L1), state_size(lua_State));
140 24 : }
141 :
142 :
143 95 : LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
144 : int i;
145 : lua_State *L;
146 : global_State *g;
147 95 : void *l = (*f)(ud, NULL, 0, state_size(LG));
148 95 : if (l == NULL) return NULL;
149 95 : L = tostate(l);
150 95 : g = &((LG *)L)->g;
151 95 : L->next = NULL;
152 95 : L->tt = LUA_TTHREAD;
153 95 : g->currentwhite = bit2mask(WHITE0BIT, FIXEDBIT);
154 95 : L->marked = luaC_white(g);
155 95 : set2bits(L->marked, FIXEDBIT, SFIXEDBIT);
156 95 : preinit_state(L, g);
157 95 : g->frealloc = f;
158 95 : g->ud = ud;
159 95 : g->mainthread = L;
160 95 : g->uvhead.u.l.prev = &g->uvhead;
161 95 : g->uvhead.u.l.next = &g->uvhead;
162 95 : g->GCthreshold = 0; /* mark it as unfinished state */
163 95 : g->strt.size = 0;
164 95 : g->strt.nuse = 0;
165 95 : g->strt.hash = NULL;
166 95 : setnilvalue(registry(L));
167 95 : luaZ_initbuffer(L, &g->buff);
168 95 : g->panic = NULL;
169 95 : g->gcstate = GCSpause;
170 95 : g->rootgc = obj2gco(L);
171 95 : g->sweepstrgc = 0;
172 95 : g->sweepgc = &g->rootgc;
173 95 : g->gray = NULL;
174 95 : g->grayagain = NULL;
175 95 : g->weak = NULL;
176 95 : g->tmudata = NULL;
177 95 : g->totalbytes = sizeof(LG);
178 95 : g->gcpause = LUAI_GCPAUSE;
179 95 : g->gcstepmul = LUAI_GCMUL;
180 95 : g->gcdept = 0;
181 950 : for (i=0; i<NUM_TAGS; i++) g->mt[i] = NULL;
182 95 : if (luaD_rawrunprotected(L, f_luaopen, NULL) != 0) {
183 : /* memory allocation error: free partial state */
184 0 : close_state(L);
185 0 : L = NULL;
186 : }
187 : else
188 : luai_userstateopen(L);
189 95 : return L;
190 : }
191 :
192 :
193 85 : static void callallgcTM (lua_State *L, void *ud) {
194 : UNUSED(ud);
195 85 : luaC_callGCTM(L); /* call GC metamethods for all udata */
196 85 : }
197 :
198 :
199 85 : LUA_API void lua_close (lua_State *L) {
200 85 : L = G(L)->mainthread; /* only the main thread can be closed */
201 : lua_lock(L);
202 85 : luaF_close(L, L->stack); /* close all upvalues for this thread */
203 85 : luaC_separateudata(L, 1); /* separate udata that have GC metamethods */
204 85 : L->errfunc = 0; /* no error function during GC metamethods */
205 : do { /* repeat until no more errors */
206 85 : L->ci = L->base_ci;
207 85 : L->base = L->top = L->ci->base;
208 85 : L->nCcalls = L->baseCcalls = 0;
209 85 : } while (luaD_rawrunprotected(L, callallgcTM, NULL) != 0);
210 : lua_assert(G(L)->tmudata == NULL);
211 : luai_userstateclose(L);
212 85 : close_state(L);
213 85 : }
214 :
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