/* * Copyright (c) 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.nodes; import static org.junit.Assert.assertEquals; import static org.junit.Assert.assertFalse; import static org.junit.Assert.assertTrue; import org.junit.Test; import com.oracle.truffle.api.frame.VirtualFrame; import com.oracle.truffle.api.nodes.Node; import com.oracle.truffle.api.nodes.RootNode; /** * Tests optional method for ensuring that a node replacement is type safe. Ordinary node * replacement is performed by unsafe assignment of a parent node's child field. */ public class SafeReplaceTest { @Test public void testCorrectReplacement() { TestRootNode root = new TestRootNode(); final TestNode oldChild = new TestNode(); final TestNode newChild = new TestNode(); root.child = oldChild; assertTrue(oldChild.isSafelyReplaceableBy(newChild)); // No parent node root.adoptChildren(); assertTrue(oldChild.isSafelyReplaceableBy(newChild)); // Now adopted by parent // new node oldChild.replace(newChild); root.execute(null); assertEquals(root.executed, 1); assertEquals(oldChild.executed, 0); assertEquals(newChild.executed, 1); } @Test public void testIncorrectReplacement() { TestRootNode root = new TestRootNode(); final TestNode oldChild = new TestNode(); root.child = oldChild; root.adoptChildren(); final TestNode newChild = new TestNode(); final TestNode strayChild = new TestNode(); assertTrue(strayChild.isSafelyReplaceableBy(newChild)); // Stray not a child of parent final WrongTestNode wrongTypeNewChild = new WrongTestNode(); assertFalse(oldChild.isSafelyReplaceableBy(wrongTypeNewChild)); } private static class TestNode extends Node { private int executed; public Object execute() { executed++; return null; } } private static class TestRootNode extends RootNode { @Child TestNode child; private int executed; TestRootNode() { super(null); } @Override public Object execute(VirtualFrame frame) { executed++; child.execute(); return null; } } private static class WrongTestNode extends Node { } }