Mercurial > hg > graal-compiler
view graal/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/ReplaceTest.java @ 11420:7c4c1a7c875a
made HotSpotGraalRuntime.instance final
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 26 Aug 2013 17:10:45 +0200 |
parents | 7f6580db1e88 |
children | df1d665ca846 |
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/* * Copyright (c) 2012, 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; import static org.junit.Assert.*; import java.util.*; import org.junit.*; import com.oracle.truffle.api.*; import com.oracle.truffle.api.frame.*; import com.oracle.truffle.api.nodes.*; /** * <h3>Replacing Nodes at Run Time</h3> * * <p> * The structure of the Truffle tree can be changed at run time by replacing nodes using the * {@link Node#replace(Node)} method. This method will automatically change the child pointer in the * parent of the node and replace it with a pointer to the new node. * </p> * * <p> * Replacing nodes is a costly operation, so it should not happen too often. The convention is that * the implementation of the Truffle nodes should ensure that there are maximal a small (and * constant) number of node replacements per Truffle node. * </p> * * <p> * The next part of the Truffle API introduction is at {@link com.oracle.truffle.api.test.CallTest}. * </p> */ public class ReplaceTest { @Test public void test() { TruffleRuntime runtime = Truffle.getRuntime(); UnresolvedNode leftChild = new UnresolvedNode("20"); UnresolvedNode rightChild = new UnresolvedNode("22"); TestRootNode rootNode = new TestRootNode(new ValueNode[]{leftChild, rightChild}); assertEquals(rootNode, leftChild.getParent()); assertEquals(rootNode, rightChild.getParent()); Iterator<Node> iterator = rootNode.getChildren().iterator(); Assert.assertEquals(leftChild, iterator.next()); Assert.assertEquals(rightChild, iterator.next()); Assert.assertFalse(iterator.hasNext()); CallTarget target = runtime.createCallTarget(rootNode); Object result = target.call(); assertEquals(42, result); assertEquals(42, target.call()); iterator = rootNode.getChildren().iterator(); Assert.assertEquals(ResolvedNode.class, iterator.next().getClass()); Assert.assertEquals(ResolvedNode.class, iterator.next().getClass()); Assert.assertFalse(iterator.hasNext()); iterator = rootNode.getChildren().iterator(); Assert.assertEquals(rootNode, iterator.next().getParent()); Assert.assertEquals(rootNode, iterator.next().getParent()); Assert.assertFalse(iterator.hasNext()); } class TestRootNode extends RootNode { @Children private final ValueNode[] children; public TestRootNode(ValueNode[] children) { this.children = adoptChildren(children); } @Override public Object execute(VirtualFrame frame) { int sum = 0; for (int i = 0; i < children.length; ++i) { sum += children[i].execute(); } return sum; } } abstract class ValueNode extends Node { abstract int execute(); } class UnresolvedNode extends ValueNode { private final String value; public UnresolvedNode(String value) { this.value = value; } @Override int execute() { int intValue = Integer.parseInt(value); ResolvedNode newNode = this.replace(new ResolvedNode(intValue)); return newNode.execute(); } } class ResolvedNode extends ValueNode { private final int value; ResolvedNode(int value) { this.value = value; } @Override int execute() { return value; } } }