From ba11831d357889ee090ce92ff508957c6c023c42 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Thu, 7 Jun 2001 12:01:21 -0300
Subject: smaller structs for udata and for strings

---
 lcode.c   |  4 ++--
 lgc.c     | 11 ++++++-----
 llex.c    |  4 ++--
 lobject.h | 13 ++++++++-----
 lstring.c | 42 +++++++++++++++++++++++-------------------
 5 files changed, 41 insertions(+), 33 deletions(-)

diff --git a/lcode.c b/lcode.c
index 8c43084e..29a6bc89 100644
--- a/lcode.c
+++ b/lcode.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lcode.c,v 1.69 2001/06/05 18:17:01 roberto Exp roberto $
+** $Id: lcode.c,v 1.70 2001/06/06 18:00:19 roberto Exp roberto $
 ** Code generator for Lua
 ** See Copyright Notice in lua.h
 */
@@ -231,7 +231,7 @@ int luaK_stringk (FuncState *fs, TString *s) {
     TObject o;
     setsvalue(&o, s);
     c = addk(fs, &o);
-    s->constindex = c;  /* hint for next time */
+    s->constindex = (unsigned short)c;  /* hint for next time */
   }
   return c;
 }
diff --git a/lgc.c b/lgc.c
index 86b7d092..fcd22a86 100644
--- a/lgc.c
+++ b/lgc.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lgc.c,v 1.99 2001/06/05 19:27:32 roberto Exp roberto $
+** $Id: lgc.c,v 1.100 2001/06/06 18:00:19 roberto Exp roberto $
 ** Garbage Collector
 ** See Copyright Notice in lua.h
 */
@@ -86,7 +86,8 @@ static void markobject (GCState *st, TObject *o) {
       strmark(tsvalue(o));
       break;
     case LUA_TUSERDATA:
-      uvalue(o)->marked = 1;
+      if (!ismarkedudata(uvalue(o)))
+        switchudatamark(uvalue(o));
       break;
     case LUA_TFUNCTION:
       markclosure(st, clvalue(o));
@@ -196,7 +197,7 @@ static int hasmark (const TObject *o) {
     case LUA_TSTRING:
       return tsvalue(o)->marked;
     case LUA_TUSERDATA:
-      return uvalue(o)->marked;
+      return ismarkedudata(uvalue(o));
     case LUA_TTABLE:
       return ismarked(hvalue(o));
     case LUA_TFUNCTION:
@@ -284,8 +285,8 @@ static void collectudata (lua_State *L) {
   Udata **p = &G(L)->rootudata;
   Udata *next;
   while ((next = *p) != NULL) {
-    if (next->marked) {
-      next->marked = 0;  /* unmark */
+    if (ismarkedudata(next)) {
+      switchudatamark(next);  /* unmark */
       p = &next->next;
     }
     else {  /* collect */
diff --git a/llex.c b/llex.c
index dfe7dbac..74b1982a 100644
--- a/llex.c
+++ b/llex.c
@@ -1,5 +1,5 @@
 /*
-** $Id: llex.c,v 1.83 2001/03/07 12:49:37 roberto Exp roberto $
+** $Id: llex.c,v 1.84 2001/03/26 14:31:49 roberto Exp roberto $
 ** Lexical Analyzer
 ** See Copyright Notice in lua.h
 */
@@ -40,7 +40,7 @@ void luaX_init (lua_State *L) {
   for (i=0; i<NUM_RESERVED; i++) {
     TString *ts = luaS_new(L, token2string[i]);
     lua_assert(strlen(token2string[i])+1 <= TOKEN_LEN);
-    ts->marked = RESERVEDMARK+i;  /* reserved word */
+    ts->marked = (unsigned short)RESERVEDMARK+i;  /* reserved word */
   }
 }
 
diff --git a/lobject.h b/lobject.h
index ebcdbbb7..53df58cc 100644
--- a/lobject.h
+++ b/lobject.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lobject.h,v 1.103 2001/06/05 18:17:01 roberto Exp roberto $
+** $Id: lobject.h,v 1.104 2001/06/06 18:00:19 roberto Exp roberto $
 ** Type definitions for Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -82,9 +82,9 @@ typedef TObject *StkId;  /* index to stack elements */
 */
 typedef struct TString {
   lu_hash hash;
-  int constindex;  /* hint to reuse constants */
   size_t len;
-  int marked;
+  unsigned short constindex;  /* hint to reuse constants */
+  short marked;
   struct TString *nexthash;  /* chain for hash table */
 } TString;
 
@@ -105,14 +105,17 @@ union L_UTString {
 
 
 typedef struct Udata {
-  int tag;
+  int tag;  /* negative means `marked' (only during GC) */
   void *value;
   size_t len;
-  int marked;
   struct Udata *next;  /* chain for list of all udata */
 } Udata;
 
 
+#define switchudatamark(u)	((u)->tag = (-((u)->tag+1)))
+#define ismarkedudata(u)	((u)->tag < 0)
+
+
 
 /*
 ** Function Prototypes
diff --git a/lstring.c b/lstring.c
index e9d165cc..21cad45b 100644
--- a/lstring.c
+++ b/lstring.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lstring.c,v 1.62 2001/03/26 14:31:49 roberto Exp roberto $
+** $Id: lstring.c,v 1.63 2001/06/06 18:00:19 roberto Exp roberto $
 ** String table (keeps all strings handled by Lua)
 ** See Copyright Notice in lua.h
 */
@@ -47,6 +47,27 @@ void luaS_resize (lua_State *L, int newsize) {
 }
 
 
+static TString *newlstr (lua_State *L, const l_char *str, size_t l, lu_hash h) {
+  TString *ts = (TString *)luaM_malloc(L, sizestring(l));
+  stringtable *tb;
+  ts->nexthash = NULL;
+  ts->len = l;
+  ts->hash = h;
+  ts->marked = 0;
+  ts->constindex = 0;
+  memcpy(getstr(ts), str, l*sizeof(l_char));
+  getstr(ts)[l] = l_c('\0');  /* ending 0 */
+  tb = &G(L)->strt;
+  h = lmod(h, tb->size);
+  ts->nexthash = tb->hash[h];  /* chain new entry */
+  tb->hash[h] = ts;
+  tb->nuse++;
+  if (tb->nuse > (ls_nstr)tb->size && tb->size <= MAX_INT/2)
+    luaS_resize(L, tb->size*2);  /* too crowded */
+  return ts;
+}
+
+
 TString *luaS_newlstr (lua_State *L, const l_char *str, size_t l) {
   TString *ts;
   lu_hash h = l;  /* seed */
@@ -58,29 +79,12 @@ TString *luaS_newlstr (lua_State *L, const l_char *str, size_t l) {
     if (ts->len == l && (memcmp(str, getstr(ts), l) == 0))
       return ts;
   }
-  /* not found */
-  ts = (TString *)luaM_malloc(L, sizestring(l));
-  ts->marked = 0;
-  ts->nexthash = NULL;
-  ts->len = l;
-  ts->hash = h;
-  ts->constindex = 0;
-  memcpy(getstr(ts), str, l*sizeof(l_char));
-  getstr(ts)[l] = 0;  /* ending 0 */
-  h = lmod(h, G(L)->strt.size);
-  ts->nexthash = G(L)->strt.hash[h];  /* chain new entry */
-  G(L)->strt.hash[h] = ts;
-  G(L)->strt.nuse++;
-  if (G(L)->strt.nuse > (ls_nstr)G(L)->strt.size &&
-      G(L)->strt.size <= MAX_INT/2)
-    luaS_resize(L, G(L)->strt.size*2);  /* too crowded */
-  return ts;
+  return newlstr(L, str, l, h);  /* not found */
 }
 
 
 Udata *luaS_newudata (lua_State *L, size_t s) {
   Udata *u = (Udata *)luaM_malloc(L, sizeudata(s));
-  u->marked = 0;
   u->len = s;
   u->tag = 0;
   u->value = ((union L_UUdata *)(u) + 1);
-- 
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