From d68209e822c21d3678cc53f1e02ba1c9dd26e23e Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Tue, 3 Oct 2000 11:27:44 -0300
Subject: details.

---
 lapi.c | 12 ++++++++----
 ltm.c  | 15 ++++++++++-----
 ltm.h  |  6 +++---
 lvm.c  |  4 ++--
 4 files changed, 23 insertions(+), 14 deletions(-)

diff --git a/lapi.c b/lapi.c
index 48488d3a..7715c5a2 100644
--- a/lapi.c
+++ b/lapi.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lapi.c,v 1.102 2000/10/02 14:47:43 roberto Exp roberto $
+** $Id: lapi.c,v 1.103 2000/10/02 20:10:55 roberto Exp roberto $
 ** Lua API
 ** See Copyright Notice in lua.h
 */
@@ -141,10 +141,14 @@ int lua_isstring (lua_State *L, int index) {
   return (t == LUA_TSTRING || t == LUA_TNUMBER);
 }
 
+
+static int auxtag (const TObject *o) {
+return ((ttype(o) == TAG_USERDATA) ? tsvalue(o)->u.d.tag :
+        (ttype(o) == TAG_TABLE) ? hvalue(o)->htag : (int)ttype(o));
+}
+
 int lua_tag (lua_State *L, int index) {
-  btest(L, index, 
-   ((ttype(o) == TAG_USERDATA) ? tsvalue(o)->u.d.tag :
-                                 luaT_effectivetag(L, o)), LUA_NOTAG);
+  btest(L, index, auxtag(o), LUA_NOTAG);
 }
 
 int lua_equal (lua_State *L, int index1, int index2) {
diff --git a/ltm.c b/ltm.c
index 524b4fb2..b009e8b4 100644
--- a/ltm.c
+++ b/ltm.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ltm.c,v 1.50 2000/09/29 12:42:13 roberto Exp roberto $
+** $Id: ltm.c,v 1.51 2000/10/02 20:10:55 roberto Exp roberto $
 ** Tag methods
 ** See Copyright Notice in lua.h
 */
@@ -117,15 +117,20 @@ int lua_copytagmethods (lua_State *L, int tagto, int tagfrom) {
 }
 
 
-int luaT_effectivetag (lua_State *L, const TObject *o) {
+const TObject *luaT_gettagmethods (lua_State *L, const TObject *o) {
   lua_Tag t = ttype(o);
   switch (t) {
     case TAG_USERDATA: {
       int tag = tsvalue(o)->u.d.tag;
-      return (tag > L->last_tag) ? TAG_USERDATA : tag;  /* deprecated test */
+      if (tag > L->last_tag)
+        return L->IMtable[TAG_USERDATA].int_method;
+      else
+        return L->IMtable[tag].int_method;
     }
-    case TAG_TABLE: return hvalue(o)->htag;
-    default: return t;
+    case TAG_TABLE:
+      return L->IMtable[hvalue(o)->htag].int_method;
+    default:
+      return L->IMtable[(int)t].int_method;;
   }
 }
 
diff --git a/ltm.h b/ltm.h
index 2d15b3ef..22974dc5 100644
--- a/ltm.h
+++ b/ltm.h
@@ -1,5 +1,5 @@
 /*
-** $Id: ltm.h,v 1.14 2000/08/07 20:21:34 roberto Exp roberto $
+** $Id: ltm.h,v 1.15 2000/09/05 19:33:32 roberto Exp roberto $
 ** Tag methods
 ** See Copyright Notice in lua.h
 */
@@ -42,14 +42,14 @@ struct IM {
 
 
 #define luaT_getim(L,tag,event) (&L->IMtable[tag].int_method[event])
-#define luaT_getimbyObj(L,o,e)  (luaT_getim(L, luaT_effectivetag(L, o),(e)))
+#define luaT_getimbyObj(L,o,e)  (&luaT_gettagmethods((L),(o))[e])
 
 extern const char *const luaT_eventname[];
 
 
 void luaT_init (lua_State *L);
 void luaT_realtag (lua_State *L, int tag);
-int luaT_effectivetag (lua_State *L, const TObject *o);
+const TObject *luaT_gettagmethods (lua_State *L, const TObject *o);
 int luaT_validevent (int t, int e);  /* used by compatibility module */
 
 
diff --git a/lvm.c b/lvm.c
index f405b802..53bc7821 100644
--- a/lvm.c
+++ b/lvm.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.c,v 1.139 2000/10/02 20:10:55 roberto Exp roberto $
+** $Id: lvm.c,v 1.140 2000/10/03 14:03:21 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -174,7 +174,7 @@ void luaV_settable (lua_State *L, StkId t, StkId key) {
 
 const TObject *luaV_getglobal (lua_State *L, TString *s) {
   const TObject *value = luaH_getstr(L->gt, s);
-  TObject *im = luaT_getimbyObj(L, value, IM_GETGLOBAL);
+  const TObject *im = luaT_getimbyObj(L, value, IM_GETGLOBAL);
   if (ttype(im) == TAG_NIL)  /* is there a tag method? */
     return value;  /* default behavior */
   else {  /* tag method */
-- 
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