1 files changed, 40 insertions, 37 deletions

diff --git a/lua/lstring.c b/lua/lstring.c
index 4911315..adec415 100644
--- a/lua/lstring.c
+++ b/lua/lstring.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lstring.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $
+** $Id: lstring.c,v 2.19 2011/05/03 16:01:57 roberto Exp $
 ** String table (keeps all strings handled by Lua)
 ** See Copyright Notice in lua.h
 */
@@ -20,54 +20,55 @@
 
 
 void luaS_resize (lua_State *L, int newsize) {
-  GCObject **newhash;
-  stringtable *tb;
   int i;
-  if (G(L)->gcstate == GCSsweepstring)
-    return;  /* cannot resize during GC traverse */
-  newhash = luaM_newvector(L, newsize, GCObject *);
-  tb = &G(L)->strt;
-  for (i=0; i<newsize; i++) newhash[i] = NULL;
+  stringtable *tb = &G(L)->strt;
+  /* cannot resize while GC is traversing strings */
+  luaC_runtilstate(L, ~bitmask(GCSsweepstring));
+  if (newsize > tb->size) {
+    luaM_reallocvector(L, tb->hash, tb->size, newsize, GCObject *);
+    for (i = tb->size; i < newsize; i++) tb->hash[i] = NULL;
+  }
   /* rehash */
   for (i=0; i<tb->size; i++) {
     GCObject *p = tb->hash[i];
+    tb->hash[i] = NULL;
     while (p) {  /* for each node in the list */
-      GCObject *next = p->gch.next;  /* save next */
-      unsigned int h = gco2ts(p)->hash;
-      int h1 = lmod(h, newsize);  /* new position */
-      lua_assert(cast_int(h%newsize) == lmod(h, newsize));
-      p->gch.next = newhash[h1];  /* chain it */
-      newhash[h1] = p;
+      GCObject *next = gch(p)->next;  /* save next */
+      unsigned int h = lmod(gco2ts(p)->hash, newsize);  /* new position */
+      gch(p)->next = tb->hash[h];  /* chain it */
+      tb->hash[h] = p;
+      resetoldbit(p);  /* see MOVE OLD rule */
       p = next;
     }
   }
-  luaM_freearray(L, tb->hash, tb->size, TString *);
+  if (newsize < tb->size) {
+    /* shrinking slice must be empty */
+    lua_assert(tb->hash[newsize] == NULL && tb->hash[tb->size - 1] == NULL);
+    luaM_reallocvector(L, tb->hash, tb->size, newsize, GCObject *);
+  }
   tb->size = newsize;
-  tb->hash = newhash;
 }
 
 
 static TString *newlstr (lua_State *L, const char *str, size_t l,
                                        unsigned int h) {
+  size_t totalsize;  /* total size of TString object */
+  GCObject **list;  /* (pointer to) list where it will be inserted */
   TString *ts;
-  stringtable *tb;
+  stringtable *tb = &G(L)->strt;
   if (l+1 > (MAX_SIZET - sizeof(TString))/sizeof(char))
     luaM_toobig(L);
-  ts = cast(TString *, luaM_malloc(L, (l+1)*sizeof(char)+sizeof(TString)));
+  if (tb->nuse >= cast(lu_int32, tb->size) && tb->size <= MAX_INT/2)
+    luaS_resize(L, tb->size*2);  /* too crowded */
+  totalsize = sizeof(TString) + ((l + 1) * sizeof(char));
+  list = &tb->hash[lmod(h, tb->size)];
+  ts = &luaC_newobj(L, LUA_TSTRING, totalsize, list, 0)->ts;
   ts->tsv.len = l;
   ts->tsv.hash = h;
-  ts->tsv.marked = luaC_white(G(L));
-  ts->tsv.tt = LUA_TSTRING;
   ts->tsv.reserved = 0;
   memcpy(ts+1, str, l*sizeof(char));
   ((char *)(ts+1))[l] = '\0';  /* ending 0 */
-  tb = &G(L)->strt;
-  h = lmod(h, tb->size);
-  ts->tsv.next = tb->hash[h];  /* chain new entry */
-  tb->hash[h] = obj2gco(ts);
   tb->nuse++;
-  if (tb->nuse > cast(lu_int32, tb->size) && tb->size <= MAX_INT/2)
-    luaS_resize(L, tb->size*2);  /* too crowded */
   return ts;
 }
 
@@ -81,15 +82,22 @@ TString *luaS_newlstr (lua_State *L, const char *str, size_t l) {
     h = h ^ ((h<<5)+(h>>2)+cast(unsigned char, str[l1-1]));
   for (o = G(L)->strt.hash[lmod(h, G(L)->strt.size)];
        o != NULL;
-       o = o->gch.next) {
+       o = gch(o)->next) {
     TString *ts = rawgco2ts(o);
-    if (ts->tsv.len == l && (memcmp(str, getstr(ts), l) == 0)) {
-      /* string may be dead */
-      if (isdead(G(L), o)) changewhite(o);
+    if (h == ts->tsv.hash &&
+        ts->tsv.len == l &&
+        (memcmp(str, getstr(ts), l * sizeof(char)) == 0)) {
+      if (isdead(G(L), o))  /* string is dead (but was not collected yet)? */
+        changewhite(o);  /* resurrect it */
       return ts;
     }
   }
-  return newlstr(L, str, l, h);  /* not found */
+  return newlstr(L, str, l, h);  /* not found; create a new string */
+}
+
+
+TString *luaS_new (lua_State *L, const char *str) {
+  return luaS_newlstr(L, str, strlen(str));
 }
 
 
@@ -97,15 +105,10 @@ Udata *luaS_newudata (lua_State *L, size_t s, Table *e) {
   Udata *u;
   if (s > MAX_SIZET - sizeof(Udata))
     luaM_toobig(L);
-  u = cast(Udata *, luaM_malloc(L, s + sizeof(Udata)));
-  u->uv.marked = luaC_white(G(L));  /* is not finalized */
-  u->uv.tt = LUA_TUSERDATA;
+  u = &luaC_newobj(L, LUA_TUSERDATA, sizeof(Udata) + s, NULL, 0)->u;
   u->uv.len = s;
   u->uv.metatable = NULL;
   u->uv.env = e;
-  /* chain it on udata list (after main thread) */
-  u->uv.next = G(L)->mainthread->next;
-  G(L)->mainthread->next = obj2gco(u);
   return u;
 }