Mercurial > vba-clojure
view src/lua/lstate.c @ 595:96ee9d72aeb9
saving progress.... sleepy time :)
author | Robert McIntyre <rlm@mit.edu> |
---|---|
date | Sat, 01 Sep 2012 13:32:19 -0500 (2012-09-01) |
parents | 27763b933818 |
children |
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1 /*2 ** $Id: lstate.c,v 2.36.1.2 2008/01/03 15:20:39 roberto Exp $3 ** Global State4 ** See Copyright Notice in lua.h5 */8 #include <stddef.h>10 #define lstate_c11 #define LUA_CORE13 #include "lua.h"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"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))32 /*33 ** Main thread combines a thread state and the global state34 */35 typedef struct LG {36 lua_State l;37 global_State g;38 } LG;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 }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 }67 /*68 ** open parts that may cause memory-allocation errors69 */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 }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 }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 }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 }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 }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 else188 luai_userstateopen(L);189 return L;190 }193 static void callallgcTM (lua_State *L, void *ud) {194 UNUSED(ud);195 luaC_callGCTM(L); /* call GC metamethods for all udata */196 }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 }