Merge pull request #246 from wintersteiger/java_fix

Java fix

src/api/java/AST.java

@@ -41,13 +41,12 @@ public class AST extends Z3Object implements Comparable
             return false;
         }
 
-	return  
+        return  (this == casted) ||
-	    (this == casted) || 
                 (this != null) &&
                 (casted != null) &&
                 (getContext().nCtx() == casted.getContext().nCtx()) &&
                 (Native.isEqAst(getContext().nCtx(), getNativeObject(), casted.getNativeObject()));
-}
+    }
 
     /**
      * Object Comparison. 

src/api/java/Constructor.java

@@ -80,12 +80,21 @@ public class Constructor extends Z3Object
 
     /**
      * Destructor.
+     * @throws Throwable 
      * @throws Z3Exception on error
      **/
-    protected void finalize()
+    protected void finalize() throws Throwable
     {
+        try {
             Native.delConstructor(getContext().nCtx(), getNativeObject());
         }
+        catch (Throwable t) {
+            throw t;
+        }
+        finally {
+            super.finalize();
+        }
+    }
 
     private int n = 0;
 

src/api/java/ConstructorList.java

@@ -24,12 +24,21 @@ public class ConstructorList extends Z3Object
 {
     /**
      * Destructor.
+     * @throws Throwable 
      * @throws Z3Exception on error
      **/
-    protected void finalize()
+    protected void finalize() throws Throwable
     {
+        try {        
             Native.delConstructorList(getContext().nCtx(), getNativeObject());            
         }
+        catch (Throwable t) {
+            throw t;
+        }
+        finally {
+            super.finalize();
+        }
+    }
 
     ConstructorList(Context ctx, long obj)
     {

src/api/java/Context.java

@@ -18,6 +18,7 @@ Notes:
 package com.microsoft.z3;
 
 import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
 
 import com.microsoft.z3.enumerations.Z3_ast_print_mode;
 
@@ -3761,16 +3762,18 @@ public class Context extends IDisposable
         return m_Optimize_DRQ;
     }
 
-    protected long m_refCount = 0;
+    protected AtomicInteger m_refCount = new AtomicInteger(0);
 
     /**
      * Finalizer.
+     * @throws Throwable 
      **/
-    protected void finalize()
+    protected void finalize() throws Throwable
     {
+        try {            
             dispose();
     
-        if (m_refCount == 0)
+            if (m_refCount.get() == 0)
             {
                 try
                 {
@@ -3781,9 +3784,13 @@ public class Context extends IDisposable
                 }
                 m_ctx = 0;
             } 
-        /*
+        }
-        else
+        catch (Throwable t) {
-            CMW: re-queue the finalizer? */
+            throw t;
+        }
+        finally {
+            super.finalize();
+        }
     }
 
     /**

src/api/java/Z3Object.java

@@ -25,11 +25,20 @@ public class Z3Object extends IDisposable
 {
     /**
      * Finalizer.
+     * @throws Throwable 
      **/
-    protected void finalize()
+    protected void finalize() throws Throwable
     {
+        try {
             dispose();            
         }
+        catch (Throwable t) {
+            throw t;
+        }
+        finally {
+            super.finalize();
+        }
+    }
 
     /**
      * Disposes of the underlying native Z3 object.
@@ -44,7 +53,7 @@ public class Z3Object extends IDisposable
 
         if (m_ctx != null)
         {            
-            m_ctx.m_refCount--;
+            m_ctx.m_refCount.decrementAndGet();
             m_ctx = null;
         }
     }
@@ -54,13 +63,13 @@ public class Z3Object extends IDisposable
 
     Z3Object(Context ctx)
     {
-        ctx.m_refCount++;
+        ctx.m_refCount.incrementAndGet();
         m_ctx = ctx;
     }
 
     Z3Object(Context ctx, long obj)
     {
-        ctx.m_refCount++;
+        ctx.m_refCount.incrementAndGet();
         m_ctx = ctx;
         incRef(obj);
         m_n_obj = obj;