1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/lua/lstate.c	Sat Mar 03 11:07:39 2012 -0600
     1.3 @@ -0,0 +1,214 @@
     1.4 +/*
     1.5 +** $Id: lstate.c,v 2.36.1.2 2008/01/03 15:20:39 roberto Exp $
     1.6 +** Global State
     1.7 +** See Copyright Notice in lua.h
     1.8 +*/
     1.9 +
    1.10 +
    1.11 +#include <stddef.h>
    1.12 +
    1.13 +#define lstate_c
    1.14 +#define LUA_CORE
    1.15 +
    1.16 +#include "lua.h"
    1.17 +
    1.18 +#include "ldebug.h"
    1.19 +#include "ldo.h"
    1.20 +#include "lfunc.h"
    1.21 +#include "lgc.h"
    1.22 +#include "llex.h"
    1.23 +#include "lmem.h"
    1.24 +#include "lstate.h"
    1.25 +#include "lstring.h"
    1.26 +#include "ltable.h"
    1.27 +#include "ltm.h"
    1.28 +
    1.29 +
    1.30 +#define state_size(x)	(sizeof(x) + LUAI_EXTRASPACE)
    1.31 +#define fromstate(l)	(cast(lu_byte *, (l)) - LUAI_EXTRASPACE)
    1.32 +#define tostate(l)   (cast(lua_State *, cast(lu_byte *, l) + LUAI_EXTRASPACE))
    1.33 +
    1.34 +
    1.35 +/*
    1.36 +** Main thread combines a thread state and the global state
    1.37 +*/
    1.38 +typedef struct LG {
    1.39 +  lua_State l;
    1.40 +  global_State g;
    1.41 +} LG;
    1.42 +  
    1.43 +
    1.44 +
    1.45 +static void stack_init (lua_State *L1, lua_State *L) {
    1.46 +  /* initialize CallInfo array */
    1.47 +  L1->base_ci = luaM_newvector(L, BASIC_CI_SIZE, CallInfo);
    1.48 +  L1->ci = L1->base_ci;
    1.49 +  L1->size_ci = BASIC_CI_SIZE;
    1.50 +  L1->end_ci = L1->base_ci + L1->size_ci - 1;
    1.51 +  /* initialize stack array */
    1.52 +  L1->stack = luaM_newvector(L, BASIC_STACK_SIZE + EXTRA_STACK, TValue);
    1.53 +  L1->stacksize = BASIC_STACK_SIZE + EXTRA_STACK;
    1.54 +  L1->top = L1->stack;
    1.55 +  L1->stack_last = L1->stack+(L1->stacksize - EXTRA_STACK)-1;
    1.56 +  /* initialize first ci */
    1.57 +  L1->ci->func = L1->top;
    1.58 +  setnilvalue(L1->top++);  /* `function' entry for this `ci' */
    1.59 +  L1->base = L1->ci->base = L1->top;
    1.60 +  L1->ci->top = L1->top + LUA_MINSTACK;
    1.61 +}
    1.62 +
    1.63 +
    1.64 +static void freestack (lua_State *L, lua_State *L1) {
    1.65 +  luaM_freearray(L, L1->base_ci, L1->size_ci, CallInfo);
    1.66 +  luaM_freearray(L, L1->stack, L1->stacksize, TValue);
    1.67 +}
    1.68 +
    1.69 +
    1.70 +/*
    1.71 +** open parts that may cause memory-allocation errors
    1.72 +*/
    1.73 +static void f_luaopen (lua_State *L, void *ud) {
    1.74 +  global_State *g = G(L);
    1.75 +  UNUSED(ud);
    1.76 +  stack_init(L, L);  /* init stack */
    1.77 +  sethvalue(L, gt(L), luaH_new(L, 0, 2));  /* table of globals */
    1.78 +  sethvalue(L, registry(L), luaH_new(L, 0, 2));  /* registry */
    1.79 +  luaS_resize(L, MINSTRTABSIZE);  /* initial size of string table */
    1.80 +  luaT_init(L);
    1.81 +  luaX_init(L);
    1.82 +  luaS_fix(luaS_newliteral(L, MEMERRMSG));
    1.83 +  g->GCthreshold = 4*g->totalbytes;
    1.84 +}
    1.85 +
    1.86 +
    1.87 +static void preinit_state (lua_State *L, global_State *g) {
    1.88 +  G(L) = g;
    1.89 +  L->stack = NULL;
    1.90 +  L->stacksize = 0;
    1.91 +  L->errorJmp = NULL;
    1.92 +  L->hook = NULL;
    1.93 +  L->hookmask = 0;
    1.94 +  L->basehookcount = 0;
    1.95 +  L->allowhook = 1;
    1.96 +  resethookcount(L);
    1.97 +  L->openupval = NULL;
    1.98 +  L->size_ci = 0;
    1.99 +  L->nCcalls = L->baseCcalls = 0;
   1.100 +  L->status = 0;
   1.101 +  L->base_ci = L->ci = NULL;
   1.102 +  L->savedpc = NULL;
   1.103 +  L->errfunc = 0;
   1.104 +  setnilvalue(gt(L));
   1.105 +}
   1.106 +
   1.107 +
   1.108 +static void close_state (lua_State *L) {
   1.109 +  global_State *g = G(L);
   1.110 +  luaF_close(L, L->stack);  /* close all upvalues for this thread */
   1.111 +  luaC_freeall(L);  /* collect all objects */
   1.112 +  lua_assert(g->rootgc == obj2gco(L));
   1.113 +  lua_assert(g->strt.nuse == 0);
   1.114 +  luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size, TString *);
   1.115 +  luaZ_freebuffer(L, &g->buff);
   1.116 +  freestack(L, L);
   1.117 +  lua_assert(g->totalbytes == sizeof(LG));
   1.118 +  (*g->frealloc)(g->ud, fromstate(L), state_size(LG), 0);
   1.119 +}
   1.120 +
   1.121 +
   1.122 +lua_State *luaE_newthread (lua_State *L) {
   1.123 +  lua_State *L1 = tostate(luaM_malloc(L, state_size(lua_State)));
   1.124 +  luaC_link(L, obj2gco(L1), LUA_TTHREAD);
   1.125 +  preinit_state(L1, G(L));
   1.126 +  stack_init(L1, L);  /* init stack */
   1.127 +  setobj2n(L, gt(L1), gt(L));  /* share table of globals */
   1.128 +  L1->hookmask = L->hookmask;
   1.129 +  L1->basehookcount = L->basehookcount;
   1.130 +  L1->hook = L->hook;
   1.131 +  resethookcount(L1);
   1.132 +  lua_assert(iswhite(obj2gco(L1)));
   1.133 +  return L1;
   1.134 +}
   1.135 +
   1.136 +
   1.137 +void luaE_freethread (lua_State *L, lua_State *L1) {
   1.138 +  luaF_close(L1, L1->stack);  /* close all upvalues for this thread */
   1.139 +  lua_assert(L1->openupval == NULL);
   1.140 +  luai_userstatefree(L1);
   1.141 +  freestack(L, L1);
   1.142 +  luaM_freemem(L, fromstate(L1), state_size(lua_State));
   1.143 +}
   1.144 +
   1.145 +
   1.146 +LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
   1.147 +  int i;
   1.148 +  lua_State *L;
   1.149 +  global_State *g;
   1.150 +  void *l = (*f)(ud, NULL, 0, state_size(LG));
   1.151 +  if (l == NULL) return NULL;
   1.152 +  L = tostate(l);
   1.153 +  g = &((LG *)L)->g;
   1.154 +  L->next = NULL;
   1.155 +  L->tt = LUA_TTHREAD;
   1.156 +  g->currentwhite = bit2mask(WHITE0BIT, FIXEDBIT);
   1.157 +  L->marked = luaC_white(g);
   1.158 +  set2bits(L->marked, FIXEDBIT, SFIXEDBIT);
   1.159 +  preinit_state(L, g);
   1.160 +  g->frealloc = f;
   1.161 +  g->ud = ud;
   1.162 +  g->mainthread = L;
   1.163 +  g->uvhead.u.l.prev = &g->uvhead;
   1.164 +  g->uvhead.u.l.next = &g->uvhead;
   1.165 +  g->GCthreshold = 0;  /* mark it as unfinished state */
   1.166 +  g->strt.size = 0;
   1.167 +  g->strt.nuse = 0;
   1.168 +  g->strt.hash = NULL;
   1.169 +  setnilvalue(registry(L));
   1.170 +  luaZ_initbuffer(L, &g->buff);
   1.171 +  g->panic = NULL;
   1.172 +  g->gcstate = GCSpause;
   1.173 +  g->rootgc = obj2gco(L);
   1.174 +  g->sweepstrgc = 0;
   1.175 +  g->sweepgc = &g->rootgc;
   1.176 +  g->gray = NULL;
   1.177 +  g->grayagain = NULL;
   1.178 +  g->weak = NULL;
   1.179 +  g->tmudata = NULL;
   1.180 +  g->totalbytes = sizeof(LG);
   1.181 +  g->gcpause = LUAI_GCPAUSE;
   1.182 +  g->gcstepmul = LUAI_GCMUL;
   1.183 +  g->gcdept = 0;
   1.184 +  for (i=0; i<NUM_TAGS; i++) g->mt[i] = NULL;
   1.185 +  if (luaD_rawrunprotected(L, f_luaopen, NULL) != 0) {
   1.186 +    /* memory allocation error: free partial state */
   1.187 +    close_state(L);
   1.188 +    L = NULL;
   1.189 +  }
   1.190 +  else
   1.191 +    luai_userstateopen(L);
   1.192 +  return L;
   1.193 +}
   1.194 +
   1.195 +
   1.196 +static void callallgcTM (lua_State *L, void *ud) {
   1.197 +  UNUSED(ud);
   1.198 +  luaC_callGCTM(L);  /* call GC metamethods for all udata */
   1.199 +}
   1.200 +
   1.201 +
   1.202 +LUA_API void lua_close (lua_State *L) {
   1.203 +  L = G(L)->mainthread;  /* only the main thread can be closed */
   1.204 +  lua_lock(L);
   1.205 +  luaF_close(L, L->stack);  /* close all upvalues for this thread */
   1.206 +  luaC_separateudata(L, 1);  /* separate udata that have GC metamethods */
   1.207 +  L->errfunc = 0;  /* no error function during GC metamethods */
   1.208 +  do {  /* repeat until no more errors */
   1.209 +    L->ci = L->base_ci;
   1.210 +    L->base = L->top = L->ci->base;
   1.211 +    L->nCcalls = L->baseCcalls = 0;
   1.212 +  } while (luaD_rawrunprotected(L, callallgcTM, NULL) != 0);
   1.213 +  lua_assert(G(L)->tmudata == NULL);
   1.214 +  luai_userstateclose(L);
   1.215 +  close_state(L);
   1.216 +}
   1.217 +