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* Copyright (c) 2012, 2013, 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.
*
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*/
package com.oracle.truffle.api.test;
import org.junit.Assert;
import org.junit.Ignore;
import org.junit.Test;
import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.TruffleRuntime;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.RootNode;
/**
* <h3>Creating a Root Node</h3>
*
* <p>
* A Truffle root node is the entry point into a Truffle tree that represents a guest language
* method. It contains a {@link RootNode#execute(VirtualFrame)} method that can return a
* {@link java.lang.Object} value as the result of the guest language method invocation. This method
* must however never be called directly. Instead, the Truffle runtime must be used to create a
* {@link CallTarget} object from a root node using the
* {@link TruffleRuntime#createCallTarget(RootNode)} method. This call target object can then be
* executed using the {@link CallTarget#call(Object...)} method or one of its overloads.
* </p>
*
* <p>
* The next part of the Truffle API introduction is at
* {@link com.oracle.truffle.api.test.ChildNodeTest}.
* </p>
*/
public class RootNodeTest {
@Test
public void test() {
TruffleRuntime runtime = Truffle.getRuntime();
TestRootNode rootNode = new TestRootNode();
CallTarget target = runtime.createCallTarget(rootNode);
Object result = target.call();
Assert.assertEquals(42, result);
}
@Test(expected = IllegalStateException.class)
public void testNotReplacable1() {
TestRootNode rootNode = new TestRootNode();
rootNode.replace(rootNode);
}
@Test(expected = IllegalStateException.class)
@Ignore
public void testNotReplacable2() {
TestRootNode2 rootNode = new TestRootNode2();
rootNode.rootNodeAsChild = new TestRootNode();
rootNode.adoptChildren();
}
@Test(expected = IllegalStateException.class)
@Ignore
public void testNotReplacable3() {
TestRootNode2 rootNode = new TestRootNode2();
rootNode.rootNodeAsChild = new Node() {
};
rootNode.adoptChildren();
rootNode.rootNodeAsChild.replace(new TestRootNode());
}
class TestRootNode extends RootNode {
TestRootNode() {
super(null);
}
@Override
public Object execute(VirtualFrame frame) {
return 42;
}
}
class TestRootNode2 extends RootNode {
@Child Node rootNodeAsChild;
TestRootNode2() {
super(null);
}
@Override
public Object execute(VirtualFrame frame) {
return 42;
}
}
}