--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/instrument/InstrumentationTestNodes.java	Tue Mar 31 19:01:07 2015 -0700
@@ -0,0 +1,172 @@
+/*
+ * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.truffle.api.test.instrument;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.api.instrument.*;
+import com.oracle.truffle.api.instrument.ProbeNode.WrapperNode;
+import com.oracle.truffle.api.nodes.*;
+
+/**
+ * Tests instrumentation where a client can attach a node that gets attached into the AST.
+ */
+class InstrumentationTestNodes {
+
+    abstract static class TestLanguageNode extends Node {
+        public abstract Object execute(VirtualFrame vFrame);
+
+        @Override
+        public boolean isInstrumentable() {
+            return true;
+        }
+
+        @Override
+        public WrapperNode createWrapperNode() {
+            return new TestLanguageWrapperNode(this);
+        }
+    }
+
+    @NodeInfo(cost = NodeCost.NONE)
+    static class TestLanguageWrapperNode extends TestLanguageNode implements WrapperNode {
+        @Child private TestLanguageNode child;
+        @Child private ProbeNode probeNode;
+
+        public TestLanguageWrapperNode(TestLanguageNode child) {
+            assert !(child instanceof TestLanguageWrapperNode);
+            this.child = child;
+        }
+
+        @Override
+        public String instrumentationInfo() {
+            return "Wrapper node for testing";
+        }
+
+        @Override
+        public boolean isInstrumentable() {
+            return false;
+        }
+
+        @Override
+        public void insertProbe(ProbeNode newProbeNode) {
+            this.probeNode = newProbeNode;
+        }
+
+        @Override
+        public Probe getProbe() {
+            return probeNode.getProbe();
+        }
+
+        @Override
+        public Node getChild() {
+            return child;
+        }
+
+        @Override
+        public Object execute(VirtualFrame vFrame) {
+            probeNode.enter(child, vFrame);
+            Object result;
+
+            try {
+                result = child.execute(vFrame);
+                probeNode.returnValue(child, vFrame, result);
+            } catch (KillException e) {
+                throw (e);
+            } catch (Exception e) {
+                probeNode.returnExceptional(child, vFrame, e);
+                throw (e);
+            }
+
+            return result;
+        }
+    }
+
+    /**
+     * A simple node for our test language to store a value.
+     */
+    static class TestValueNode extends TestLanguageNode {
+        private final int value;
+
+        public TestValueNode(int value) {
+            this.value = value;
+        }
+
+        @Override
+        public Object execute(VirtualFrame vFrame) {
+            return new Integer(this.value);
+        }
+    }
+
+    /**
+     * A node for our test language that adds up two {@link TestValueNode}s.
+     */
+    static class TestAdditionNode extends TestLanguageNode {
+        @Child private TestLanguageNode leftChild;
+        @Child private TestLanguageNode rightChild;
+
+        public TestAdditionNode(TestValueNode leftChild, TestValueNode rightChild) {
+            this.leftChild = insert(leftChild);
+            this.rightChild = insert(rightChild);
+        }
+
+        @Override
+        public Object execute(VirtualFrame vFrame) {
+            return new Integer(((Integer) leftChild.execute(vFrame)).intValue() + ((Integer) rightChild.execute(vFrame)).intValue());
+        }
+    }
+
+    /**
+     * Truffle requires that all guest languages to have a {@link RootNode} which sits atop any AST
+     * of the guest language. This is necessary since creating a {@link CallTarget} is how Truffle
+     * completes an AST. The root nodes serves as our entry point into a program.
+     */
+    static class TestRootNode extends RootNode {
+        @Child private TestLanguageNode body;
+
+        /**
+         * This constructor emulates the global machinery that applies registered probers to every
+         * newly created AST. Global registry is not used, since that would interfere with other
+         * tests run in the same environment.
+         */
+        public TestRootNode(TestLanguageNode body) {
+            super(null);
+            this.body = body;
+        }
+
+        @Override
+        public Object execute(VirtualFrame vFrame) {
+            return body.execute(vFrame);
+        }
+
+        @Override
+        public boolean isCloningAllowed() {
+            return true;
+        }
+
+        @Override
+        public void applyInstrumentation() {
+            Probe.applyASTProbers(body);
+        }
+    }
+
+}