Lua 5.3.0-work25.3.0-work2

1 files changed, 53 insertions, 32 deletions

diff --git a/src/lstate.c b/src/lstate.c
index 207a106d..1628ad91 100644
--- a/src/lstate.c
+++ b/src/lstate.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.c,v 2.99 2012/10/02 17:40:53 roberto Exp $
+** $Id: lstate.c,v 2.121 2014/02/18 13:46:26 roberto Exp $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -30,10 +30,6 @@
 #define LUAI_GCPAUSE	200  /* 200% */
 #endif
 
-#if !defined(LUAI_GCMAJOR)
-#define LUAI_GCMAJOR	200  /* 200% */
-#endif
-
 #if !defined(LUAI_GCMUL)
 #define LUAI_GCMUL	200 /* GC runs 'twice the speed' of memory allocation */
 #endif
@@ -119,6 +115,9 @@ CallInfo *luaE_extendCI (lua_State *L) {
 }
 
 
+/*
+** free all CallInfo structures not in use by a thread
+*/
 void luaE_freeCI (lua_State *L) {
   CallInfo *ci = L->ci;
   CallInfo *next = ci->next;
@@ -130,6 +129,22 @@ void luaE_freeCI (lua_State *L) {
 }
 
 
+/*
+** free half of the CallInfo structures not in use by a thread
+*/
+void luaE_shrinkCI (lua_State *L) {
+  CallInfo *ci = L->ci;
+  while (ci->next != NULL) {  /* while there is 'next' */
+    CallInfo *next2 = ci->next->next;  /* next's next */
+    if (next2 == NULL) break;
+    luaM_free(L, ci->next);  /* remove next */
+    ci->next = next2;  /* remove 'next' from the list */
+    next2->previous = ci;
+    ci = next2;
+  }
+}
+
+
 static void stack_init (lua_State *L1, lua_State *L) {
   int i; CallInfo *ci;
   /* initialize stack array */
@@ -163,22 +178,23 @@ static void freestack (lua_State *L) {
 ** Create registry table and its predefined values
 */
 static void init_registry (lua_State *L, global_State *g) {
-  TValue mt;
+  TValue temp;
   /* create registry */
   Table *registry = luaH_new(L);
   sethvalue(L, &g->l_registry, registry);
   luaH_resize(L, registry, LUA_RIDX_LAST, 0);
   /* registry[LUA_RIDX_MAINTHREAD] = L */
-  setthvalue(L, &mt, L);
-  luaH_setint(L, registry, LUA_RIDX_MAINTHREAD, &mt);
+  setthvalue(L, &temp, L);  /* temp = L */
+  luaH_setint(L, registry, LUA_RIDX_MAINTHREAD, &temp);
   /* registry[LUA_RIDX_GLOBALS] = table of globals */
-  sethvalue(L, &mt, luaH_new(L));
-  luaH_setint(L, registry, LUA_RIDX_GLOBALS, &mt);
+  sethvalue(L, &temp, luaH_new(L));  /* temp = new table (global table) */
+  luaH_setint(L, registry, LUA_RIDX_GLOBALS, &temp);
 }
 
 
 /*
-** open parts of the state that may cause memory-allocation errors
+** open parts of the state that may cause memory-allocation errors.
+** ('g->version' != NULL flags that the state was completely build)
 */
 static void f_luaopen (lua_State *L, void *ud) {
   global_State *g = G(L);
@@ -190,20 +206,23 @@ static void f_luaopen (lua_State *L, void *ud) {
   luaX_init(L);
   /* pre-create memory-error message */
   g->memerrmsg = luaS_newliteral(L, MEMERRMSG);
-  luaS_fix(g->memerrmsg);  /* it should never be collected */
+  luaC_fix(L, obj2gco(g->memerrmsg));  /* it should never be collected */
   g->gcrunning = 1;  /* allow gc */
+  g->version = lua_version(NULL);
+  luai_userstateopen(L);
 }
 
 
 /*
-** preinitialize a state with consistent values without allocating
+** preinitialize a thread with consistent values without allocating
 ** any memory (to avoid errors)
 */
-static void preinit_state (lua_State *L, global_State *g) {
+static void preinit_thread (lua_State *L, global_State *g) {
   G(L) = g;
   L->stack = NULL;
   L->ci = NULL;
   L->stacksize = 0;
+  L->twups = L;  /* thread has no upvalues */
   L->errorJmp = NULL;
   L->nCcalls = 0;
   L->hook = NULL;
@@ -222,6 +241,8 @@ static void close_state (lua_State *L) {
   global_State *g = G(L);
   luaF_close(L, L->stack);  /* close all upvalues for this thread */
   luaC_freeallobjects(L);  /* collect all objects */
+  if (g->version)  /* closing a fully built state? */
+    luai_userstateclose(L);
   luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size);
   luaZ_freebuffer(L, &g->buff);
   freestack(L);
@@ -231,13 +252,20 @@ static void close_state (lua_State *L) {
 
 
 LUA_API lua_State *lua_newthread (lua_State *L) {
+    global_State *g = G(L);
   lua_State *L1;
   lua_lock(L);
   luaC_checkGC(L);
-  L1 = &luaC_newobj(L, LUA_TTHREAD, sizeof(LX), NULL, offsetof(LX, l))->th;
+  /* create new thread */
+  L1 = &cast(LX *, luaM_newobject(L, LUA_TTHREAD, sizeof(LX)))->l;
+  L1->marked = luaC_white(g);
+  L1->tt = LUA_TTHREAD;
+  /* link it on list 'allgc' */
+  L1->next = g->allgc;
+  g->allgc = obj2gco(L1);
   setthvalue(L, L->top, L1);
   api_incr_top(L);
-  preinit_state(L1, G(L));
+  preinit_thread(L1, g);
   L1->hookmask = L->hookmask;
   L1->basehookcount = L->basehookcount;
   L1->hook = L->hook;
@@ -269,36 +297,32 @@ LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
   g = &l->g;
   L->next = NULL;
   L->tt = LUA_TTHREAD;
-  g->currentwhite = bit2mask(WHITE0BIT, FIXEDBIT);
+  g->currentwhite = bitmask(WHITE0BIT);
   L->marked = luaC_white(g);
-  g->gckind = KGC_NORMAL;
-  preinit_state(L, g);
+  preinit_thread(L, g);
   g->frealloc = f;
   g->ud = ud;
   g->mainthread = L;
   g->seed = makeseed(L);
-  g->uvhead.u.l.prev = &g->uvhead;
-  g->uvhead.u.l.next = &g->uvhead;
   g->gcrunning = 0;  /* no GC while building state */
   g->GCestimate = 0;
-  g->strt.size = 0;
-  g->strt.nuse = 0;
+  g->strt.size = g->strt.nuse = 0;
   g->strt.hash = NULL;
   setnilvalue(&g->l_registry);
   luaZ_initbuffer(L, &g->buff);
   g->panic = NULL;
-  g->version = lua_version(NULL);
+  g->version = NULL;
   g->gcstate = GCSpause;
-  g->allgc = NULL;
-  g->finobj = NULL;
-  g->tobefnz = NULL;
-  g->sweepgc = g->sweepfin = NULL;
+  g->gckind = KGC_NORMAL;
+  g->allgc = g->finobj = g->tobefnz = g->fixedgc = NULL;
+  g->sweepgc = NULL;
   g->gray = g->grayagain = NULL;
   g->weak = g->ephemeron = g->allweak = NULL;
+  g->twups = NULL;
   g->totalbytes = sizeof(LG);
   g->GCdebt = 0;
+  g->gcfinnum = 0;
   g->gcpause = LUAI_GCPAUSE;
-  g->gcmajorinc = LUAI_GCMAJOR;
   g->gcstepmul = LUAI_GCMUL;
   for (i=0; i < LUA_NUMTAGS; i++) g->mt[i] = NULL;
   if (luaD_rawrunprotected(L, f_luaopen, NULL) != LUA_OK) {
@@ -306,8 +330,6 @@ LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
     close_state(L);
     L = NULL;
   }
-  else
-    luai_userstateopen(L);
   return L;
 }
 
@@ -315,7 +337,6 @@ LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
 LUA_API void lua_close (lua_State *L) {
   L = G(L)->mainthread;  /* only the main thread can be closed */
   lua_lock(L);
-  luai_userstateclose(L);
   close_state(L);
 }