Backout recent patch working on Object and Namespace refcounts.

It creates new leaks and memory corruption according to valgrind,
and the preceding checkin did not.  Keep developing on the memleak branch
and it can merge again when valgrind and memleak tests both like it.

2 files changed, 90 insertions, 116 deletions

diff --git a/generic/tclOO.c b/generic/tclOO.c
index a129a52..587e46d 100644
--- a/generic/tclOO.c
+++ b/generic/tclOO.c
@@ -397,39 +397,28 @@ InitFoundation(
 
     fPtr->objectCls = AllocClass(interp,
 	    AllocObject(interp, "object", (Namespace *)fPtr->ooNs, NULL));
-    /* Corresponding TclOODecrRefCount in KillFoudation */
-    AddRef(fPtr->objectCls->thisPtr);
-
-    /* This is why it is unnecessary in this routine to replace the
-     * incremented reference count of fPtr->objectCls that was swallowed by
-     * fakeObject. */
-    fPtr->objectCls->superclasses.num = 0;
-    ckfree(fPtr->objectCls->superclasses.list);
-    fPtr->objectCls->superclasses.list = NULL;
-
-    /* special initialization for the primordial objects */
-    fPtr->objectCls->thisPtr->flags |= ROOT_OBJECT;
-    fPtr->objectCls->flags |= ROOT_OBJECT;
-
     fPtr->classCls = AllocClass(interp,
 	    AllocObject(interp, "class", (Namespace *)fPtr->ooNs, NULL));
-    /* Corresponding TclOODecrRefCount in KillFoudation */
-    AddRef(fPtr->classCls->thisPtr);
-
-    /*
-     * Increment reference counts for each reference because these
-     * relationships can be dynamically changed.
-     *
-     * Corresponding TclOODecrRefCount for all incremented refcounts is in
-     * KillFoundation.
-     */
 
     /* Rewire bootstrapped objects. */
     fPtr->objectCls->thisPtr->selfCls = fPtr->classCls;
-    AddRef(fPtr->objectCls->thisPtr->selfCls->thisPtr);
-
     fPtr->classCls->thisPtr->selfCls = fPtr->classCls;
+
+    AddRef(fPtr->objectCls->thisPtr);
+    AddRef(fPtr->classCls->thisPtr);
     AddRef(fPtr->classCls->thisPtr->selfCls->thisPtr);
+    AddRef(fPtr->objectCls->thisPtr->selfCls->thisPtr);
+
+    /* special initialization for the primordial objects */
+    fPtr->objectCls->thisPtr->flags |= ROOT_OBJECT;
+    fPtr->objectCls->flags |= ROOT_OBJECT;
+
+    /* This is why it is unnecessary in this routine to make up for the
+     * incremented reference count of fPtr->objectCls that was sallwed by
+     * fakeObject. */
+    fPtr->objectCls->superclasses.num = 0;
+    ckfree(fPtr->objectCls->superclasses.list);
+    fPtr->objectCls->superclasses.list = NULL;
 
     fPtr->classCls->thisPtr->flags |= ROOT_CLASS;
     fPtr->classCls->flags |= ROOT_CLASS;
@@ -563,20 +552,20 @@ KillFoundation(
 {
     Foundation *fPtr = GetFoundation(interp);
 
+    /*
+     * Crude mechanism to avoid leaking the Object struct of the
+     * foundation components oo::object and oo::class
+     *
+     * Should probably be replaced with something more elegantly designed.
+     */
+    while (TclOODecrRefCount(fPtr->objectCls->thisPtr) == 0) {};
+    while (TclOODecrRefCount(fPtr->classCls->thisPtr) == 0) {};
+
     TclDecrRefCount(fPtr->unknownMethodNameObj);
     TclDecrRefCount(fPtr->constructorName);
     TclDecrRefCount(fPtr->destructorName);
     TclDecrRefCount(fPtr->clonedName);
     TclDecrRefCount(fPtr->defineName);
-    if (fPtr->objectCls->thisPtr->selfCls != NULL) {
-	TclOODecrRefCount(fPtr->objectCls->thisPtr->selfCls->thisPtr);
-    }
-    if (fPtr->classCls->thisPtr->selfCls != NULL) {
-	TclOODecrRefCount(fPtr->classCls->thisPtr->selfCls->thisPtr);
-    }
-    TclOODecrRefCount(fPtr->objectCls->thisPtr);
-    TclOODecrRefCount(fPtr->classCls->thisPtr);
-
     ckfree(fPtr);
 }
 
@@ -660,8 +649,6 @@ AllocObject(
 	Tcl_ResetResult(interp);
     }
 
-    ((Namespace *)oPtr->namespacePtr)->refCount++;
-
     /*
      * Make the namespace know about the helper commands. This grants access
      * to the [self] and [next] commands.
@@ -833,9 +820,10 @@ ObjectRenamedTrace(
 /*
  * ----------------------------------------------------------------------
  *
- * DeleteDescendants --
+ * ReleaseClassContents --
  *
- *	Delete all descendants of a particular class.
+ *	Tear down the special class data structure, including deleting all
+ *	dependent classes and objects.
  *
  * ----------------------------------------------------------------------
  */
@@ -847,79 +835,50 @@ DeleteDescendants(
 {
     Class *clsPtr = oPtr->classPtr, *subclassPtr, *mixinSubclassPtr;
     Object *instancePtr;
+    int i;
 
     /*
      * Squelch classes that this class has been mixed into.
      */
 
-    if (clsPtr->mixinSubs.num > 0) {
-	while (clsPtr->mixinSubs.num > 0) {
-	    mixinSubclassPtr = clsPtr->mixinSubs.list[clsPtr->mixinSubs.num-1];
-	    /* This condition also covers the case where mixinSubclassPtr ==
-	     * clsPtr
-	     */
-	    if (!Deleted(mixinSubclassPtr->thisPtr)) {
-		Tcl_DeleteCommandFromToken(interp,
-			mixinSubclassPtr->thisPtr->command);
-	    }
-	    TclOORemoveFromMixinSubs(mixinSubclassPtr, clsPtr);
+    FOREACH(mixinSubclassPtr, clsPtr->mixinSubs) {
+	/* This condition also covers the case where mixinSubclassPtr ==
+	 * clsPtr
+	 */
+	if (!Deleted(mixinSubclassPtr->thisPtr)) {
+	    Tcl_DeleteCommandFromToken(interp,
+		    mixinSubclassPtr->thisPtr->command);
 	}
-    }
-    if (clsPtr->mixinSubs.size > 0) {
-	ckfree(clsPtr->mixinSubs.list);
-	clsPtr->mixinSubs.size = 0;
+	i -= TclOORemoveFromMixinSubs(mixinSubclassPtr, clsPtr);
+	TclOODecrRefCount(mixinSubclassPtr->thisPtr);
     }
     /*
      * Squelch subclasses of this class.
      */
 
-    if (clsPtr->subclasses.num > 0) {
-	while (clsPtr->subclasses.num > 0) {
-	    subclassPtr = clsPtr->subclasses.list[clsPtr->subclasses.num-1];
-	    if (!Deleted(subclassPtr->thisPtr) && !IsRoot(subclassPtr)) {
-		Tcl_DeleteCommandFromToken(interp, subclassPtr->thisPtr->command);
-	    }
-	    TclOORemoveFromSubclasses(subclassPtr, clsPtr);
+    FOREACH(subclassPtr, clsPtr->subclasses) {
+	if (!Deleted(subclassPtr->thisPtr) && !IsRoot(subclassPtr)) {
+	    Tcl_DeleteCommandFromToken(interp, subclassPtr->thisPtr->command);
 	}
-    }
-    if (clsPtr->subclasses.size > 0) {
-	ckfree(clsPtr->subclasses.list);
-	clsPtr->subclasses.list = NULL;
-	clsPtr->subclasses.size = 0;
+	i -= TclOORemoveFromSubclasses(subclassPtr, clsPtr);
+	TclOODecrRefCount(subclassPtr->thisPtr);
     }
 
     /*
      * Squelch instances of this class (includes objects we're mixed into).
      */
 
-    if (clsPtr->instances.num > 0) {
-	while (clsPtr->instances.num > 0) {
-	    instancePtr = clsPtr->instances.list[clsPtr->instances.num-1];
+    if (!IsRootClass(oPtr)) {
+	FOREACH(instancePtr, clsPtr->instances) {
 	    /* This condition also covers the case where instancePtr == oPtr */
 	    if (!Deleted(instancePtr) && !IsRoot(instancePtr)) {
 		Tcl_DeleteCommandFromToken(interp, instancePtr->command);
 	    }
-	    TclOORemoveFromInstances(instancePtr, clsPtr);
+	    i -= TclOORemoveFromInstances(instancePtr, clsPtr);
 	}
     }
-    if (clsPtr->instances.size > 0) {
-	ckfree(clsPtr->instances.list);
-	clsPtr->instances.list = NULL;
-	clsPtr->instances.size = 0;
-    }
 }
 	
-
-/*
- * ----------------------------------------------------------------------
- *
- * ReleaseClassContents --
- *
- *	Tear down the special class data structure, including deleting all
- *	dependent classes and objects.
- *
- * ----------------------------------------------------------------------
- */
 
 static void
 ReleaseClassContents(
@@ -989,6 +948,21 @@ ReleaseClassContents(
     }
 
     /*
+     * Squelch our instances.
+     */
+
+    if (clsPtr->instances.num) {
+	Object *oPtr;
+
+	FOREACH(oPtr, clsPtr->instances) {
+	    TclOODecrRefCount(oPtr);
+	}
+	ckfree(clsPtr->instances.list);
+	clsPtr->instances.list = NULL;
+	clsPtr->instances.num = 0;
+    }
+
+    /*
      * Squelch our metadata.
      */
 
@@ -1004,21 +978,11 @@ ReleaseClassContents(
 	clsPtr->metadataPtr = NULL;
     }
 
-    if (clsPtr->mixins.num) {
-	FOREACH(tmpClsPtr, clsPtr->mixins) {
-	    TclOORemoveFromMixinSubs(clsPtr, tmpClsPtr);
-	}
-	ckfree(clsPtr->mixins.list);
+    FOREACH(tmpClsPtr, clsPtr->mixins) {
+	TclOORemoveFromMixinSubs(clsPtr, tmpClsPtr);
     }
-
-    if (clsPtr->superclasses.num > 0) {
-	FOREACH(tmpClsPtr, clsPtr->superclasses) {
-	    TclOORemoveFromSubclasses(clsPtr, tmpClsPtr);
-	    TclOODecrRefCount(tmpClsPtr->thisPtr);
-	}
-	ckfree(clsPtr->superclasses.list);
-	clsPtr->superclasses.num = 0;
-	clsPtr->superclasses.list = NULL;
+    FOREACH(tmpClsPtr, clsPtr->superclasses) {
+	TclOORemoveFromSubclasses(clsPtr, tmpClsPtr);
     }
 
     FOREACH_HASH_VALUE(mPtr, &clsPtr->classMethods) {
@@ -1146,10 +1110,10 @@ ObjectNamespaceDeleted(
     /* To do: Should this be protected with a * !IsRoot() condition?  */ 
     TclOORemoveFromInstances(oPtr, oPtr->selfCls);
 
-    if (oPtr->mixins.num > 0) {
-	FOREACH(mixinPtr, oPtr->mixins) {
-	    TclOORemoveFromInstances(oPtr, mixinPtr);
-	}
+    FOREACH(mixinPtr, oPtr->mixins) {
+	i -= TclOORemoveFromInstances(oPtr, mixinPtr);
+    }
+    if (i) {
 	ckfree(oPtr->mixins.list);
     }
 
@@ -1221,9 +1185,7 @@ ObjectNamespaceDeleted(
      * Delete the object structure itself.
      */
 
-    TclNsDecrRefCount((Namespace *)oPtr->namespacePtr);
     oPtr->namespacePtr = NULL;
-    TclOODecrRefCount(oPtr->selfCls->thisPtr);
     oPtr->selfCls = NULL;
     TclOODecrRefCount(oPtr);
     return;
@@ -1242,7 +1204,13 @@ ObjectNamespaceDeleted(
  */
 int TclOODecrRefCount(Object *oPtr) {
     if (oPtr->refCount-- <= 1) {
+	Class *clsPtr = oPtr->classPtr;
 	if (oPtr->classPtr != NULL) {
+	    ckfree(clsPtr->superclasses.list);
+	    ckfree(clsPtr->subclasses.list);
+	    ckfree(clsPtr->instances.list);
+	    ckfree(clsPtr->mixinSubs.list);
+	    ckfree(clsPtr->mixins.list);
 	    ckfree(oPtr->classPtr);
 	}
 	ckfree(oPtr);
@@ -1282,6 +1250,9 @@ TclOORemoveFromInstances(
 {
     int i, res = 0;
     Object *instPtr;
+    if (Deleted(clsPtr->thisPtr)) {
+	return res;
+    }
 
     FOREACH(instPtr, clsPtr->instances) {
 	if (oPtr == instPtr) {
@@ -1344,6 +1315,9 @@ TclOORemoveFromSubclasses(
 {
     int i, res = 0;
     Class *subclsPtr;
+    if (Deleted(superPtr->thisPtr)) {
+	return res;
+    }
 
     FOREACH(subclsPtr, superPtr->subclasses) {
 	if (subPtr == subclsPtr) {
@@ -1408,6 +1382,10 @@ TclOORemoveFromMixinSubs(
     int i, res = 0;
     Class *subclsPtr;
 
+    if (Deleted(superPtr->thisPtr)) {
+	return res;
+    }
+
     FOREACH(subclsPtr, superPtr->mixinSubs) {
 	if (subPtr == subclsPtr) {
 	    RemoveItem(Class, superPtr->mixinSubs, i);
@@ -1700,7 +1678,6 @@ TclNewObjectInstanceCommon(
 
     oPtr = AllocObject(interp, simpleName, nsPtr, nsNameStr);
     oPtr->selfCls = classPtr;
-    AddRef(classPtr->thisPtr);
     TclOOAddToInstances(oPtr, classPtr);
     /*
      * Check to see if we're really creating a class. If so, allocate the
@@ -1937,11 +1914,6 @@ Tcl_CopyObjectInstance(
 	cls2Ptr->superclasses.num = clsPtr->superclasses.num;
 	FOREACH(superPtr, cls2Ptr->superclasses) {
 	    TclOOAddToSubclasses(cls2Ptr, superPtr);
-
-	    /* For the new item in cls2Ptr->superclasses that memcpy just
-	     * created
-	     */
-	    AddRef(superPtr->thisPtr);
 	}
 
 	/*
diff --git a/generic/tclOODefineCmds.c b/generic/tclOODefineCmds.c
index dfd2acf..d05d899 100644
--- a/generic/tclOODefineCmds.c
+++ b/generic/tclOODefineCmds.c
@@ -1125,13 +1125,12 @@ TclOODefineClassObjCmd(
      */
 
     if (oPtr->selfCls != clsPtr) {
-
 	TclOORemoveFromInstances(oPtr, oPtr->selfCls);
-	TclOODecrRefCount(oPtr->selfCls->thisPtr);
+
+	/* Reference count already incremented 3 lines up. */
 	oPtr->selfCls = clsPtr;
-	AddRef(oPtr->selfCls->thisPtr);
-	TclOOAddToInstances(oPtr, oPtr->selfCls);
 
+	TclOOAddToInstances(oPtr, oPtr->selfCls);
 	if (oPtr->classPtr != NULL) {
 	    BumpGlobalEpoch(interp, oPtr->classPtr);
 	} else {
@@ -2152,6 +2151,7 @@ ClassSuperSet(
 	    superclasses[0] = oPtr->fPtr->objectCls;
 	}
 	superc = 1;
+	/* Corresponding TclOODecrRefCount is near the end of this function */
 	AddRef(superclasses[0]->thisPtr);
     } else {
 	for (i=0 ; i<superc ; i++) {
@@ -2204,6 +2204,8 @@ ClassSuperSet(
     oPtr->classPtr->superclasses.num = superc;
     FOREACH(superPtr, oPtr->classPtr->superclasses) {
 	TclOOAddToSubclasses(oPtr->classPtr, superPtr);
+	/* To account for the AddRef() earlier in this function */ 
+	TclOODecrRefCount(superPtr->thisPtr);
     }
     BumpGlobalEpoch(interp, oPtr->classPtr);