--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/Runtime/src/com/sun/hotspot/c1x/server/ReplacingStreams.java	Fri Apr 22 15:08:53 2011 +0200
@@ -0,0 +1,226 @@
+/*
+ * Copyright (c) 2011 Sun Microsystems, Inc.  All rights reserved.
+ *
+ * Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product
+ * that is described in this document. In particular, and without limitation, these intellectual property
+ * rights may include one or more of the U.S. patents listed at http://www.sun.com/patents and one or
+ * more additional patents or pending patent applications in the U.S. and in other countries.
+ *
+ * U.S. Government Rights - Commercial software. Government users are subject to the Sun
+ * Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its
+ * supplements.
+ *
+ * Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or
+ * registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks
+ * are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the
+ * U.S. and other countries.
+ *
+ * UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open
+ * Company, Ltd.
+ */
+package com.sun.hotspot.c1x.server;
+
+import java.io.*;
+import java.lang.reflect.*;
+import java.util.*;
+
+import com.sun.cri.ci.*;
+import com.sun.hotspot.c1x.*;
+import com.sun.hotspot.c1x.Compiler;
+
+public class ReplacingStreams {
+
+    private IdentityHashMap<Object, Placeholder> objectMap = new IdentityHashMap<Object, Placeholder>();
+    private ArrayList<Object> objectList = new ArrayList<Object>();
+
+    private ReplacingOutputStream output;
+    private ReplacingInputStream input;
+
+    private InvocationSocket invocation;
+
+    public ReplacingStreams(OutputStream outputStream, InputStream inputStream) throws IOException {
+        output = new ReplacingOutputStream(new BufferedOutputStream(outputStream));
+        // required, because creating an ObjectOutputStream writes a header, but doesn't flush the stream
+        output.flush();
+        input = new ReplacingInputStream(new BufferedInputStream(inputStream));
+        invocation = new InvocationSocket(output, input);
+
+        addStaticObject(CiValue.IllegalValue);
+        addStaticObject(HotSpotProxy.DUMMY_CONSTANT_OBJ);
+    }
+
+    public void setInvocationSocket(InvocationSocket invocation) {
+        this.invocation = invocation;
+    }
+
+    public ReplacingOutputStream getOutput() {
+        return output;
+    }
+
+    public ReplacingInputStream getInput() {
+        return input;
+    }
+
+    public InvocationSocket getInvocation() {
+        return invocation;
+    }
+
+    private void addStaticObject(Object obj) {
+        int id = objectList.size();
+        objectList.add(obj);
+        objectMap.put(obj, new Placeholder(id));
+    }
+
+    public static class Placeholder implements Serializable {
+
+        public final int id;
+
+        public Placeholder(int id) {
+            this.id = id;
+        }
+
+        @Override
+        public String toString() {
+            return "#<" + id + ">";
+        }
+    }
+
+    public static class NewRemoteCallPlaceholder implements Serializable {
+
+        public final Class<?>[] interfaces;
+
+        public NewRemoteCallPlaceholder(Class<?>[] interfaces) {
+            this.interfaces = interfaces;
+        }
+    }
+
+    public static class NewDummyPlaceholder implements Serializable {
+    }
+
+    /**
+     * Replaces certain cir objects that cannot easily be made Serializable.
+     */
+    public class ReplacingInputStream extends ObjectInputStream {
+
+        private Compiler compiler;
+
+        public ReplacingInputStream(InputStream in) throws IOException {
+            super(in);
+            enableResolveObject(true);
+        }
+
+        public void setCompiler(Compiler compiler) {
+            this.compiler = compiler;
+        }
+
+        @Override
+        protected Object resolveObject(Object obj) throws IOException {
+            // see ReplacingInputStream.replaceObject for details on when these types of objects are created
+
+            if (obj instanceof Placeholder) {
+                Placeholder placeholder = (Placeholder) obj;
+                obj = objectList.get(placeholder.id);
+                return obj;
+            }
+
+            if (obj instanceof NewRemoteCallPlaceholder) {
+                NewRemoteCallPlaceholder newPlaceholder = (NewRemoteCallPlaceholder) obj;
+                Placeholder placeholder = new Placeholder(objectList.size());
+                obj = Proxy.newProxyInstance(getClass().getClassLoader(), newPlaceholder.interfaces, invocation.new Handler(placeholder));
+                objectMap.put(obj, placeholder);
+                objectList.add(obj);
+                return obj;
+            }
+
+            if (obj instanceof NewDummyPlaceholder) {
+                obj = new Placeholder(objectList.size());
+                objectMap.put(obj, (Placeholder) obj);
+                objectList.add(obj);
+                return obj;
+            }
+
+            return obj;
+        }
+    }
+
+    /**
+     * Replaces certain cir objects that cannot easily be made Serializable.
+     */
+    public class ReplacingOutputStream extends ObjectOutputStream {
+
+        public ReplacingOutputStream(OutputStream out) throws IOException {
+            super(out);
+            enableReplaceObject(true);
+        }
+
+        @Override
+        protected Object replaceObject(Object obj) throws IOException {
+            // is the object a known instance?
+            Placeholder placeholder = objectMap.get(obj);
+            if (placeholder != null) {
+                return placeholder;
+            }
+
+            // is the object an instance of a class that will always be executed remotely?
+            if (obj instanceof Remote) {
+                return createRemoteCallPlaceholder(obj);
+            }
+
+            // is the object a constant of object type?
+            if (obj.getClass() == CiConstant.class) {
+                CiConstant constant = (CiConstant) obj;
+                if (constant.kind != CiKind.Object) {
+                    return obj;
+                }
+                Object contents = constant.asObject();
+                if (contents == null) {
+                    return obj;
+                }
+                // don't replace if the object already is a placeholder
+                if (contents instanceof Placeholder || contents instanceof Long) {
+                    return obj;
+                }
+                placeholder = objectMap.get(contents);
+                if (placeholder != null) {
+                    return CiConstant.forObject(placeholder);
+                }
+                if (contents instanceof Remote) {
+                    return CiConstant.forObject(createRemoteCallPlaceholder(contents));
+                }
+                return CiConstant.forObject(createDummyPlaceholder(contents));
+            }
+            return obj;
+        }
+    }
+
+    public static Class<?>[] getAllInterfaces(Class<?> clazz) {
+        HashSet<Class< ? >> interfaces = new HashSet<Class<?>>();
+        getAllInterfaces(clazz, interfaces);
+        return interfaces.toArray(new Class<?>[interfaces.size()]);
+    }
+
+    private static void getAllInterfaces(Class<?> clazz, HashSet<Class<?>> interfaces) {
+        for (Class< ? > iface : clazz.getInterfaces()) {
+            if (!interfaces.contains(iface)) {
+                interfaces.add(iface);
+                getAllInterfaces(iface, interfaces);
+            }
+        }
+        if (clazz.getSuperclass() != null) {
+            getAllInterfaces(clazz.getSuperclass(), interfaces);
+        }
+    }
+
+    private Object createRemoteCallPlaceholder(Object obj) {
+        // collect all interfaces that this object's class implements (proxies only support interfaces)
+        objectMap.put(obj, new Placeholder(objectList.size()));
+        objectList.add(obj);
+        return new NewRemoteCallPlaceholder(getAllInterfaces(obj.getClass()));
+    }
+
+    public Object createDummyPlaceholder(Object obj) {
+        objectMap.put(obj, new Placeholder(objectList.size()));
+        objectList.add(obj);
+        return new NewDummyPlaceholder();
+    }
+}