Bug 217967 FF104 crash [@ PL_DHashTableOperate ] changing caps access control prefs

More consistent DomainPolicy lifecycle management avoids use of corrupted hashtable data
patch by g.maone@informaction.com r=dveditz sr=shaver a=bsmedberg


git-svn-id: svn://10.0.0.236/trunk@175300 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/caps/include/nsScriptSecurityManager.h

@@ -259,6 +259,13 @@ public:
     DomainPolicy() : mWildcardPolicy(nsnull),
                      mRefCount(0)
     {
+        mGeneration = sGeneration;
+
+#ifdef DEBUG_CAPS_DomainPolicyLifeCycle
+        ++sObjects;
+        _printPopulationInfo();
+#endif
+
     }
 
     PRBool Init()
@@ -283,6 +290,12 @@ public:
     ~DomainPolicy()
     {
         PL_DHashTableFinish(this);
+
+#ifdef DEBUG_CAPS_DomainPolicyLifeCycle
+        --sObjects;
+        _printPopulationInfo();
+#endif
+
     }
 
     void Hold()
@@ -295,11 +308,29 @@ public:
         if (--mRefCount == 0)
             delete this;
     }
-
+    
+    static void InvalidateAll()
+    {
+        sGeneration++;
+    }
+    
+    PRBool IsInvalid()
+    {
+        return mGeneration != sGeneration; 
+    }
+    
     ClassPolicy* mWildcardPolicy;
 
 private:
     PRUint32 mRefCount;
+    PRUint32 mGeneration;
+    static PRUint32 sGeneration;
+    
+#ifdef DEBUG_CAPS_DomainPolicyLifeCycle
+    static PRUint32 sObjects;
+    static void _printPopulationInfo();
+#endif
+
 };
 
 /////////////////////////////