Mercurial > hg > truffle
diff truffle/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/RootNodeTest.java @ 21951:9c8c0937da41
Moving all sources into truffle subdirectory
author | Jaroslav Tulach <jaroslav.tulach@oracle.com> |
---|---|
date | Wed, 17 Jun 2015 10:58:08 +0200 |
parents | graal/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/RootNodeTest.java@2ed720ce9273 |
children | 5bc7f7b867ab |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/truffle/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/RootNodeTest.java Wed Jun 17 10:58:08 2015 +0200 @@ -0,0 +1,71 @@ +/* + * 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. + * + * 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 org.junit.*; + +import com.oracle.truffle.api.*; +import com.oracle.truffle.api.frame.*; +import com.oracle.truffle.api.nodes.*; + +/** + * <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); + } + + class TestRootNode extends RootNode { + + public TestRootNode() { + super(null); + } + + @Override + public Object execute(VirtualFrame frame) { + return 42; + } + } +}