better organization of "malloc responsabilities"

lstate.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.c,v 1.111 2002/11/14 16:15:53 roberto Exp roberto $
+** $Id: lstate.c,v 1.112 2002/11/18 11:01:55 roberto Exp roberto $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -30,10 +30,18 @@ union UEXTRASPACE {L_Umaxalign a; LUA_USERSTATE b;};
 #endif
 
 
-static void close_state (lua_State *L);
 
+/*
+** you can change this function through the official API:
+** call `lua_setpanicf'
+*/
+static int default_panic (lua_State *L) {
+  UNUSED(L);
+  return 0;
+}
 
-static lua_State *newthread (lua_State *L) {
+
+static lua_State *mallocstate (lua_State *L) {
   lu_byte *block = (lu_byte *)luaM_malloc(L, sizeof(lua_State) + EXTRASPACE);
   if (block == NULL) return NULL;
   else {
@@ -43,13 +51,9 @@ static lua_State *newthread (lua_State *L) {
 }
 
 
-/*
-** you can change this function through the official API:
-** call `lua_setpanicf'
-*/
-static int default_panic (lua_State *L) {
-  UNUSED(L);
-  return 0;
+static void freestate (lua_State *L, lua_State *L1) {
+  luaM_free(L, cast(lu_byte *, L1) - EXTRASPACE,
+               sizeof(lua_State) + EXTRASPACE);
 }
 
 
@@ -69,29 +73,36 @@ static void stack_init (lua_State *L1, lua_State *L) {
 }
 
 
+static void freestack (lua_State *L, lua_State *L1) {
+  luaM_freearray(L, L1->base_ci, L1->size_ci, CallInfo);
+  luaM_freearray(L, L1->stack, L1->stacksize, TObject);
+}
+
+
 /*
 ** open parts that may cause memory-allocation errors
 */
 static void f_luaopen (lua_State *L, void *ud) {
-  UNUSED(ud);
   /* create a new global state */
-  L->l_G = luaM_new(L, global_State);
-  G(L)->mainthread = L;
-  G(L)->GCthreshold = 0;  /* mark it as unfinished state */
-  G(L)->strt.size = 0;
-  G(L)->strt.nuse = 0;
-  G(L)->strt.hash = NULL;
+  global_State *g = luaM_new(L, global_State);
+  UNUSED(ud);
+  L->l_G = g;
+  g->mainthread = L;
+  g->GCthreshold = 0;  /* mark it as unfinished state */
+  g->strt.size = 0;
+  g->strt.nuse = 0;
+  g->strt.hash = NULL;
   setnilvalue(defaultmeta(L));
   setnilvalue(registry(L));
-  luaZ_initbuffer(L, &G(L)->buff);
-  G(L)->panic = &default_panic;
-  G(L)->rootgc = NULL;
-  G(L)->rootudata = NULL;
-  G(L)->tmudata = NULL;
-  setnilvalue(key(G(L)->dummynode));
-  setnilvalue(val(G(L)->dummynode));
-  G(L)->dummynode->next = NULL;
-  G(L)->nblocks = sizeof(lua_State) + sizeof(global_State);
+  luaZ_initbuffer(L, &g->buff);
+  g->panic = &default_panic;
+  g->rootgc = NULL;
+  g->rootudata = NULL;
+  g->tmudata = NULL;
+  setnilvalue(key(g->dummynode));
+  setnilvalue(val(g->dummynode));
+  g->dummynode->next = NULL;
+  g->nblocks = sizeof(lua_State) + sizeof(global_State);
   stack_init(L, L);  /* init stack */
   /* create default meta table with a dummy table, and then close the loop */
   defaultmeta(L)->tt = LUA_TTABLE;
@@ -103,7 +114,7 @@ static void f_luaopen (lua_State *L, void *ud) {
   luaT_init(L);
   luaX_init(L);
   luaS_fix(luaS_newliteral(L, MEMERRMSG));
-  G(L)->GCthreshold = 4*G(L)->nblocks;
+  g->GCthreshold = 4*G(L)->nblocks;
 }
 
 
@@ -124,8 +135,26 @@ static void preinit_state (lua_State *L) {
 }
 
 
+static void close_state (lua_State *L) {
+  luaF_close(L, L->stack);  /* close all upvalues for this thread */
+  if (G(L)) {  /* close global state */
+    luaC_sweep(L, 1);  /* collect all elements */
+    lua_assert(G(L)->rootgc == NULL);
+    lua_assert(G(L)->rootudata == NULL);
+    luaS_freeall(L);
+    luaZ_freebuffer(L, &G(L)->buff);
+  }
+  freestack(L, L);
+  if (G(L)) {
+    lua_assert(G(L)->nblocks == sizeof(lua_State) + sizeof(global_State));
+    luaM_freelem(L, G(L));
+  }
+  freestate(NULL, L);
+}
+
+
 lua_State *luaE_newthread (lua_State *L) {
-  lua_State *L1 = newthread(L);
+  lua_State *L1 = mallocstate(L);
   luaC_link(L, valtogco(L1), LUA_TTHREAD);
   preinit_state(L1);
   L1->l_G = L->l_G;
@@ -135,8 +164,16 @@ lua_State *luaE_newthread (lua_State *L) {
 }
 
 
+void luaE_freethread (lua_State *L, lua_State *L1) {
+  luaF_close(L1, L1->stack);  /* close all upvalues for this thread */
+  lua_assert(L1->openupval == NULL);
+  freestack(L, L1);
+  freestate(L, L1);
+}
+
+
 LUA_API lua_State *lua_open (void) {
-  lua_State *L = newthread(NULL);
+  lua_State *L = mallocstate(NULL);
   if (L) {  /* allocation OK? */
     L->tt = LUA_TTHREAD;
     preinit_state(L);
@@ -152,30 +189,6 @@ LUA_API lua_State *lua_open (void) {
 }
 
 
-void luaE_freethread (lua_State *L, lua_State *L1) {
-  luaF_close(L1, L1->stack);  /* close all upvalues for this thread */
-  lua_assert(L1->openupval == NULL);
-  luaM_freearray(L, L1->base_ci, L1->size_ci, CallInfo);
-  luaM_freearray(L, L1->stack, L1->stacksize, TObject);
-  luaM_free(L, cast(lu_byte *, L1) - EXTRASPACE,
-                sizeof(lua_State) + EXTRASPACE);
-}
-
-
-static void close_state (lua_State *L) {
-  luaF_close(L, L->stack);  /* close all upvalues for this thread */
-  if (G(L)) {  /* close global state */
-    luaC_sweep(L, 1);  /* collect all elements */
-    lua_assert(G(L)->rootgc == NULL);
-    lua_assert(G(L)->rootudata == NULL);
-    luaS_freeall(L);
-    luaZ_freebuffer(L, &G(L)->buff);
-    luaM_freelem(NULL, L->l_G);
-  }
-  luaE_freethread(NULL, L);
-}
-
-
 LUA_API void lua_close (lua_State *L) {
   lua_lock(L);
   L = G(L)->mainthread;  /* only the main thread can be closed */