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/src/middleware/lua/lstate.c

https://bitbucket.org/vivkin/gam3b00bs/
C | 214 lines | 168 code | 31 blank | 15 comment | 12 complexity | c82b593a33e6460cf2254056e9184d6e MD5 | raw file
  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*/
 35typedef struct LG {
 36  lua_State l;
 37  global_State g;
 38} LG;
 39  
 40
 41
 42static 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
 61static 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*/
 70static 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
 84static 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
105static 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
119lua_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
134void 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
143LUA_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
193static void callallgcTM (lua_State *L, void *ud) {
194  UNUSED(ud);
195  luaC_callGCTM(L);  /* call GC metamethods for all udata */
196}
197
198
199LUA_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