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* 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.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.RootNode;
/**
* <h3>Calling Another Tree</h3>
*
* <p>
* A guest language implementation can create multiple call targets using the
* {@link TruffleRuntime#createCallTarget(RootNode)} method. Those call targets can be passed around
* as normal Java objects and used for calling guest language methods.
* </p>
*
* <p>
* The next part of the Truffle API introduction is at
* {@link com.oracle.truffle.api.test.ArgumentsTest}.
* </p>
*/
public class CallTest {
@Test
public void test() {
TruffleRuntime runtime = Truffle.getRuntime();
CallTarget foo = runtime.createCallTarget(new ConstantRootNode(20));
CallTarget bar = runtime.createCallTarget(new ConstantRootNode(22));
CallTarget main = runtime.createCallTarget(new DualCallNode(foo, bar));
Object result = main.call();
Assert.assertEquals(42, result);
}
class DualCallNode extends RootNode {
private final CallTarget firstTarget;
private final CallTarget secondTarget;
DualCallNode(CallTarget firstTarget, CallTarget secondTarget) {
super(null);
this.firstTarget = firstTarget;
this.secondTarget = secondTarget;
}
@Override
public Object execute(VirtualFrame frame) {
return ((Integer) firstTarget.call()) + ((Integer) secondTarget.call());
}
}
class ConstantRootNode extends RootNode {
private final int value;
ConstantRootNode(int value) {
super(null);
this.value = value;
}
@Override
public Object execute(VirtualFrame frame) {
return value;
}
}
}