1 files changed, 50 insertions, 124 deletions

diff --git a/apps/plugins/lua/lstring.c b/apps/plugins/lua/lstring.c
index af96c89c18..49113151cc 100644
--- a/apps/plugins/lua/lstring.c
+++ b/apps/plugins/lua/lstring.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lstring.c,v 2.26.1.1 2013/04/12 18:48:47 roberto Exp $
+** $Id: lstring.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $
 ** String table (keeps all strings handled by Lua)
 ** See Copyright Notice in lua.h
 */
@@ -18,157 +18,78 @@
 #include "lstring.h"
 
 
-/*
-** Lua will use at most ~(2^LUAI_HASHLIMIT) bytes from a string to
-** compute its hash
-*/
-#if !defined(LUAI_HASHLIMIT)
-#define LUAI_HASHLIMIT          5
-#endif
-
-
-/*
-** equality for long strings
-*/
-int luaS_eqlngstr (TString *a, TString *b) {
-  size_t len = a->tsv.len;
-  lua_assert(a->tsv.tt == LUA_TLNGSTR && b->tsv.tt == LUA_TLNGSTR);
-  return (a == b) ||  /* same instance or... */
-    ((len == b->tsv.len) &&  /* equal length and ... */
-     (memcmp(getstr(a), getstr(b), len) == 0));  /* equal contents */
-}
-
-
-/*
-** equality for strings
-*/
-int luaS_eqstr (TString *a, TString *b) {
-  return (a->tsv.tt == b->tsv.tt) &&
-         (a->tsv.tt == LUA_TSHRSTR ? eqshrstr(a, b) : luaS_eqlngstr(a, b));
-}
-
 
-unsigned int luaS_hash (const char *str, size_t l, unsigned int seed) {
-  unsigned int h = seed ^ cast(unsigned int, l);
-  size_t l1;
-  size_t step = (l >> LUAI_HASHLIMIT) + 1;
-  for (l1 = l; l1 >= step; l1 -= step)
-    h = h ^ ((h<<5) + (h>>2) + cast_byte(str[l1 - 1]));
-  return h;
-}
-
-
-/*
-** resizes the string table
-*/
 void luaS_resize (lua_State *L, int newsize) {
+  GCObject **newhash;
+  stringtable *tb;
   int i;
-  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;
-  }
+  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;
   /* 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 = 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 */
+      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;
       p = next;
     }
   }
-  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 *);
-  }
+  luaM_freearray(L, tb->hash, tb->size, TString *);
   tb->size = newsize;
+  tb->hash = newhash;
 }
 
 
-/*
-** creates a new string object
-*/
-static TString *createstrobj (lua_State *L, const char *str, size_t l,
-                              int tag, unsigned int h, GCObject **list) {
+static TString *newlstr (lua_State *L, const char *str, size_t l,
+                                       unsigned int h) {
   TString *ts;
-  size_t totalsize;  /* total size of TString object */
-  totalsize = sizeof(TString) + ((l + 1) * sizeof(char));
-  ts = &luaC_newobj(L, tag, totalsize, list, 0)->ts;
+  stringtable *tb;
+  if (l+1 > (MAX_SIZET - sizeof(TString))/sizeof(char))
+    luaM_toobig(L);
+  ts = cast(TString *, luaM_malloc(L, (l+1)*sizeof(char)+sizeof(TString)));
   ts->tsv.len = l;
   ts->tsv.hash = h;
-  ts->tsv.extra = 0;
+  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 */
-  return ts;
-}
-
-
-/*
-** creates a new short string, inserting it into string table
-*/
-static TString *newshrstr (lua_State *L, const char *str, size_t l,
-                                       unsigned int h) {
-  GCObject **list;  /* (pointer to) list where it will be inserted */
-  stringtable *tb = &G(L)->strt;
-  TString *s;
-  if (tb->nuse >= cast(lu_int32, tb->size) && tb->size <= MAX_INT/2)
-    luaS_resize(L, tb->size*2);  /* too crowded */
-  list = &tb->hash[lmod(h, tb->size)];
-  s = createstrobj(L, str, l, LUA_TSHRSTR, h, list);
+  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++;
-  return s;
+  if (tb->nuse > cast(lu_int32, tb->size) && tb->size <= MAX_INT/2)
+    luaS_resize(L, tb->size*2);  /* too crowded */
+  return ts;
 }
 
 
-/*
-** checks whether short string exists and reuses it or creates a new one
-*/
-static TString *internshrstr (lua_State *L, const char *str, size_t l) {
+TString *luaS_newlstr (lua_State *L, const char *str, size_t l) {
   GCObject *o;
-  global_State *g = G(L);
-  unsigned int h = luaS_hash(str, l, g->seed);
-  for (o = g->strt.hash[lmod(h, g->strt.size)];
+  unsigned int h = cast(unsigned int, l);  /* seed */
+  size_t step = (l>>5)+1;  /* if string is too long, don't hash all its chars */
+  size_t l1;
+  for (l1=l; l1>=step; l1-=step)  /* compute hash */
+    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 = gch(o)->next) {
+       o = o->gch.next) {
     TString *ts = rawgco2ts(o);
-    if (h == ts->tsv.hash &&
-        l == ts->tsv.len &&
-        (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 */
+    if (ts->tsv.len == l && (memcmp(str, getstr(ts), l) == 0)) {
+      /* string may be dead */
+      if (isdead(G(L), o)) changewhite(o);
       return ts;
     }
   }
-  return newshrstr(L, str, l, h);  /* not found; create a new string */
-}
-
-
-/*
-** new string (with explicit length)
-*/
-TString *luaS_newlstr (lua_State *L, const char *str, size_t l) {
-  if (l <= LUAI_MAXSHORTLEN)  /* short string? */
-    return internshrstr(L, str, l);
-  else {
-    if (l + 1 > (MAX_SIZET - sizeof(TString))/sizeof(char))
-      luaM_toobig(L);
-    return createstrobj(L, str, l, LUA_TLNGSTR, G(L)->seed, NULL);
-  }
-}
-
-
-/*
-** new zero-terminated string
-*/
-TString *luaS_new (lua_State *L, const char *str) {
-  return luaS_newlstr(L, str, strlen(str));
+  return newlstr(L, str, l, h);  /* not found */
 }
 
 
@@ -176,10 +97,15 @@ Udata *luaS_newudata (lua_State *L, size_t s, Table *e) {
   Udata *u;
   if (s > MAX_SIZET - sizeof(Udata))
     luaM_toobig(L);
-  u = &luaC_newobj(L, LUA_TUSERDATA, sizeof(Udata) + s, NULL, 0)->u;
+  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->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;
 }