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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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).
*
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* 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.Node;
import com.oracle.truffle.api.nodes.RootNode;
/**
* <h3>Passing Arguments</h3>
*
* <p>
* When invoking a call target with {@link CallTarget#call(Object[])}, arguments can be passed. A
* Truffle node can access the arguments passed into the Truffle method by using
* {@link VirtualFrame#getArguments}.
* </p>
*
* <p>
* The arguments class should only contain fields that are declared as final. This allows the
* Truffle runtime to improve optimizations around guest language method calls. Also, the arguments
* object array must never be stored into a field. It should be created immediately before invoking
* {@link CallTarget#call(Object[])} and no longer be accessed afterwards.
* </p>
*
* <p>
* The next part of the Truffle API introduction is at {@link com.oracle.truffle.api.test.FrameTest}
* .
* </p>
*/
public class ArgumentsTest {
@Test
public void test() {
TruffleRuntime runtime = Truffle.getRuntime();
TestRootNode rootNode = new TestRootNode(new TestArgumentNode[]{new TestArgumentNode(0), new TestArgumentNode(1)});
CallTarget target = runtime.createCallTarget(rootNode);
Object result = target.call(new Object[]{20, 22});
Assert.assertEquals(42, result);
}
private static class TestRootNode extends RootNode {
@Children private final TestArgumentNode[] children;
TestRootNode(TestArgumentNode[] children) {
super(null);
this.children = children;
}
@Override
public Object execute(VirtualFrame frame) {
int sum = 0;
for (int i = 0; i < children.length; ++i) {
sum += children[i].execute(frame);
}
return sum;
}
}
private static class TestArgumentNode extends Node {
private final int index;
TestArgumentNode(int index) {
this.index = index;
}
int execute(VirtualFrame frame) {
return (Integer) frame.getArguments()[index];
}
}
}