001/*
002 * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.compiler.test;
024
025import java.lang.invoke.*;
026import java.lang.reflect.*;
027
028import org.junit.*;
029
030import com.oracle.graal.nodes.*;
031import com.oracle.graal.nodes.StructuredGraph.*;
032
033public final class MethodHandleEagerResolution extends GraalCompilerTest {
034    private static final MethodHandle FIELD_HANDLE;
035
036    static {
037        Field field;
038        try {
039            field = String.class.getDeclaredField("value");
040        } catch (NoSuchFieldException ex) {
041            throw new RuntimeException(ex.getMessage(), ex);
042        }
043        field.setAccessible(true);
044
045        try {
046            FIELD_HANDLE = MethodHandles.lookup().unreflectGetter(field);
047        } catch (IllegalAccessException e) {
048            throw new RuntimeException("unable to initialize field handle", e);
049        }
050    }
051
052    public static char[] getBackingCharArray(String str) {
053        try {
054            return (char[]) FIELD_HANDLE.invokeExact(str);
055        } catch (Throwable e) {
056            throw new IllegalStateException();
057        }
058    }
059
060    @Test
061    public void testFieldInvokeExact() {
062        StructuredGraph graph = parseEager("getBackingCharArray", AllowAssumptions.NO);
063        assertTrue(graph.getNodes().filter(DeoptimizeNode.class).isEmpty());
064    }
065
066}