rlm@1: /*
rlm@1: ** $Id: lstate.c,v 2.36.1.2 2008/01/03 15:20:39 roberto Exp $
rlm@1: ** Global State
rlm@1: ** See Copyright Notice in lua.h
rlm@1: */
rlm@1: 
rlm@1: 
rlm@1: #include <stddef.h>
rlm@1: 
rlm@1: #define lstate_c
rlm@1: #define LUA_CORE
rlm@1: 
rlm@1: #include "lua.h"
rlm@1: 
rlm@1: #include "ldebug.h"
rlm@1: #include "ldo.h"
rlm@1: #include "lfunc.h"
rlm@1: #include "lgc.h"
rlm@1: #include "llex.h"
rlm@1: #include "lmem.h"
rlm@1: #include "lstate.h"
rlm@1: #include "lstring.h"
rlm@1: #include "ltable.h"
rlm@1: #include "ltm.h"
rlm@1: 
rlm@1: 
rlm@1: #define state_size(x)	(sizeof(x) + LUAI_EXTRASPACE)
rlm@1: #define fromstate(l)	(cast(lu_byte *, (l)) - LUAI_EXTRASPACE)
rlm@1: #define tostate(l)   (cast(lua_State *, cast(lu_byte *, l) + LUAI_EXTRASPACE))
rlm@1: 
rlm@1: 
rlm@1: /*
rlm@1: ** Main thread combines a thread state and the global state
rlm@1: */
rlm@1: typedef struct LG {
rlm@1:   lua_State l;
rlm@1:   global_State g;
rlm@1: } LG;
rlm@1:   
rlm@1: 
rlm@1: 
rlm@1: static void stack_init (lua_State *L1, lua_State *L) {
rlm@1:   /* initialize CallInfo array */
rlm@1:   L1->base_ci = luaM_newvector(L, BASIC_CI_SIZE, CallInfo);
rlm@1:   L1->ci = L1->base_ci;
rlm@1:   L1->size_ci = BASIC_CI_SIZE;
rlm@1:   L1->end_ci = L1->base_ci + L1->size_ci - 1;
rlm@1:   /* initialize stack array */
rlm@1:   L1->stack = luaM_newvector(L, BASIC_STACK_SIZE + EXTRA_STACK, TValue);
rlm@1:   L1->stacksize = BASIC_STACK_SIZE + EXTRA_STACK;
rlm@1:   L1->top = L1->stack;
rlm@1:   L1->stack_last = L1->stack+(L1->stacksize - EXTRA_STACK)-1;
rlm@1:   /* initialize first ci */
rlm@1:   L1->ci->func = L1->top;
rlm@1:   setnilvalue(L1->top++);  /* `function' entry for this `ci' */
rlm@1:   L1->base = L1->ci->base = L1->top;
rlm@1:   L1->ci->top = L1->top + LUA_MINSTACK;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void freestack (lua_State *L, lua_State *L1) {
rlm@1:   luaM_freearray(L, L1->base_ci, L1->size_ci, CallInfo);
rlm@1:   luaM_freearray(L, L1->stack, L1->stacksize, TValue);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: /*
rlm@1: ** open parts that may cause memory-allocation errors
rlm@1: */
rlm@1: static void f_luaopen (lua_State *L, void *ud) {
rlm@1:   global_State *g = G(L);
rlm@1:   UNUSED(ud);
rlm@1:   stack_init(L, L);  /* init stack */
rlm@1:   sethvalue(L, gt(L), luaH_new(L, 0, 2));  /* table of globals */
rlm@1:   sethvalue(L, registry(L), luaH_new(L, 0, 2));  /* registry */
rlm@1:   luaS_resize(L, MINSTRTABSIZE);  /* initial size of string table */
rlm@1:   luaT_init(L);
rlm@1:   luaX_init(L);
rlm@1:   luaS_fix(luaS_newliteral(L, MEMERRMSG));
rlm@1:   g->GCthreshold = 4*g->totalbytes;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void preinit_state (lua_State *L, global_State *g) {
rlm@1:   G(L) = g;
rlm@1:   L->stack = NULL;
rlm@1:   L->stacksize = 0;
rlm@1:   L->errorJmp = NULL;
rlm@1:   L->hook = NULL;
rlm@1:   L->hookmask = 0;
rlm@1:   L->basehookcount = 0;
rlm@1:   L->allowhook = 1;
rlm@1:   resethookcount(L);
rlm@1:   L->openupval = NULL;
rlm@1:   L->size_ci = 0;
rlm@1:   L->nCcalls = L->baseCcalls = 0;
rlm@1:   L->status = 0;
rlm@1:   L->base_ci = L->ci = NULL;
rlm@1:   L->savedpc = NULL;
rlm@1:   L->errfunc = 0;
rlm@1:   setnilvalue(gt(L));
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void close_state (lua_State *L) {
rlm@1:   global_State *g = G(L);
rlm@1:   luaF_close(L, L->stack);  /* close all upvalues for this thread */
rlm@1:   luaC_freeall(L);  /* collect all objects */
rlm@1:   lua_assert(g->rootgc == obj2gco(L));
rlm@1:   lua_assert(g->strt.nuse == 0);
rlm@1:   luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size, TString *);
rlm@1:   luaZ_freebuffer(L, &g->buff);
rlm@1:   freestack(L, L);
rlm@1:   lua_assert(g->totalbytes == sizeof(LG));
rlm@1:   (*g->frealloc)(g->ud, fromstate(L), state_size(LG), 0);
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: lua_State *luaE_newthread (lua_State *L) {
rlm@1:   lua_State *L1 = tostate(luaM_malloc(L, state_size(lua_State)));
rlm@1:   luaC_link(L, obj2gco(L1), LUA_TTHREAD);
rlm@1:   preinit_state(L1, G(L));
rlm@1:   stack_init(L1, L);  /* init stack */
rlm@1:   setobj2n(L, gt(L1), gt(L));  /* share table of globals */
rlm@1:   L1->hookmask = L->hookmask;
rlm@1:   L1->basehookcount = L->basehookcount;
rlm@1:   L1->hook = L->hook;
rlm@1:   resethookcount(L1);
rlm@1:   lua_assert(iswhite(obj2gco(L1)));
rlm@1:   return L1;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: void luaE_freethread (lua_State *L, lua_State *L1) {
rlm@1:   luaF_close(L1, L1->stack);  /* close all upvalues for this thread */
rlm@1:   lua_assert(L1->openupval == NULL);
rlm@1:   luai_userstatefree(L1);
rlm@1:   freestack(L, L1);
rlm@1:   luaM_freemem(L, fromstate(L1), state_size(lua_State));
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
rlm@1:   int i;
rlm@1:   lua_State *L;
rlm@1:   global_State *g;
rlm@1:   void *l = (*f)(ud, NULL, 0, state_size(LG));
rlm@1:   if (l == NULL) return NULL;
rlm@1:   L = tostate(l);
rlm@1:   g = &((LG *)L)->g;
rlm@1:   L->next = NULL;
rlm@1:   L->tt = LUA_TTHREAD;
rlm@1:   g->currentwhite = bit2mask(WHITE0BIT, FIXEDBIT);
rlm@1:   L->marked = luaC_white(g);
rlm@1:   set2bits(L->marked, FIXEDBIT, SFIXEDBIT);
rlm@1:   preinit_state(L, g);
rlm@1:   g->frealloc = f;
rlm@1:   g->ud = ud;
rlm@1:   g->mainthread = L;
rlm@1:   g->uvhead.u.l.prev = &g->uvhead;
rlm@1:   g->uvhead.u.l.next = &g->uvhead;
rlm@1:   g->GCthreshold = 0;  /* mark it as unfinished state */
rlm@1:   g->strt.size = 0;
rlm@1:   g->strt.nuse = 0;
rlm@1:   g->strt.hash = NULL;
rlm@1:   setnilvalue(registry(L));
rlm@1:   luaZ_initbuffer(L, &g->buff);
rlm@1:   g->panic = NULL;
rlm@1:   g->gcstate = GCSpause;
rlm@1:   g->rootgc = obj2gco(L);
rlm@1:   g->sweepstrgc = 0;
rlm@1:   g->sweepgc = &g->rootgc;
rlm@1:   g->gray = NULL;
rlm@1:   g->grayagain = NULL;
rlm@1:   g->weak = NULL;
rlm@1:   g->tmudata = NULL;
rlm@1:   g->totalbytes = sizeof(LG);
rlm@1:   g->gcpause = LUAI_GCPAUSE;
rlm@1:   g->gcstepmul = LUAI_GCMUL;
rlm@1:   g->gcdept = 0;
rlm@1:   for (i=0; i<NUM_TAGS; i++) g->mt[i] = NULL;
rlm@1:   if (luaD_rawrunprotected(L, f_luaopen, NULL) != 0) {
rlm@1:     /* memory allocation error: free partial state */
rlm@1:     close_state(L);
rlm@1:     L = NULL;
rlm@1:   }
rlm@1:   else
rlm@1:     luai_userstateopen(L);
rlm@1:   return L;
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: static void callallgcTM (lua_State *L, void *ud) {
rlm@1:   UNUSED(ud);
rlm@1:   luaC_callGCTM(L);  /* call GC metamethods for all udata */
rlm@1: }
rlm@1: 
rlm@1: 
rlm@1: LUA_API void lua_close (lua_State *L) {
rlm@1:   L = G(L)->mainthread;  /* only the main thread can be closed */
rlm@1:   lua_lock(L);
rlm@1:   luaF_close(L, L->stack);  /* close all upvalues for this thread */
rlm@1:   luaC_separateudata(L, 1);  /* separate udata that have GC metamethods */
rlm@1:   L->errfunc = 0;  /* no error function during GC metamethods */
rlm@1:   do {  /* repeat until no more errors */
rlm@1:     L->ci = L->base_ci;
rlm@1:     L->base = L->top = L->ci->base;
rlm@1:     L->nCcalls = L->baseCcalls = 0;
rlm@1:   } while (luaD_rawrunprotected(L, callallgcTM, NULL) != 0);
rlm@1:   lua_assert(G(L)->tmudata == NULL);
rlm@1:   luai_userstateclose(L);
rlm@1:   close_state(L);
rlm@1: }
rlm@1: