MethodHandleEagerResolution.java revision 12657:6ef01bd40ce2 
1/*
2 * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23package org.graalvm.compiler.core.test;
24
25import java.lang.invoke.MethodHandle;
26import java.lang.invoke.MethodHandles;
27import java.lang.reflect.Field;
28
29import org.junit.Test;
30
31import org.graalvm.compiler.nodes.DeoptimizeNode;
32import org.graalvm.compiler.nodes.StructuredGraph;
33import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
34
35public final class MethodHandleEagerResolution extends GraalCompilerTest {
36    private static final MethodHandle FIELD_HANDLE;
37
38    static {
39        Field field;
40        try {
41            field = String.class.getDeclaredField("value");
42        } catch (NoSuchFieldException ex) {
43            throw new RuntimeException(ex.getMessage(), ex);
44        }
45        field.setAccessible(true);
46
47        try {
48            FIELD_HANDLE = MethodHandles.lookup().unreflectGetter(field);
49        } catch (IllegalAccessException e) {
50            throw new RuntimeException("unable to initialize field handle", e);
51        }
52    }
53
54    public static char[] getBackingCharArray(String str) {
55        try {
56            return (char[]) FIELD_HANDLE.invokeExact(str);
57        } catch (Throwable e) {
58            throw new IllegalStateException();
59        }
60    }
61
62    @Test
63    public void testFieldInvokeExact() {
64        StructuredGraph graph = parseEager("getBackingCharArray", AllowAssumptions.NO);
65        assertTrue(graph.getNodes().filter(DeoptimizeNode.class).isEmpty());
66    }
67
68}
69