1/*
2 * Copyright (c) 2015, 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.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25package java.lang.invoke;
26
27import java.nio.Buffer;
28import java.nio.ByteBuffer;
29
30import static java.lang.invoke.MethodHandleStatics.UNSAFE;
31
32/**
33 * The base class for generated byte array and byte buffer view
34 * implementations
35 */
36abstract class VarHandleByteArrayBase {
37    // Buffer.address
38    static final long BUFFER_ADDRESS;
39    // Buffer.limit
40    static final long BUFFER_LIMIT;
41    // ByteBuffer.hb
42    static final long BYTE_BUFFER_HB;
43    // ByteBuffer.isReadOnly
44    static final long BYTE_BUFFER_IS_READ_ONLY;
45
46    static {
47        try {
48            BUFFER_ADDRESS = UNSAFE.objectFieldOffset(
49                    Buffer.class.getDeclaredField("address"));
50
51            BUFFER_LIMIT = UNSAFE.objectFieldOffset(
52                    Buffer.class.getDeclaredField("limit"));
53
54            BYTE_BUFFER_HB = UNSAFE.objectFieldOffset(
55                    ByteBuffer.class.getDeclaredField("hb"));
56
57            BYTE_BUFFER_IS_READ_ONLY = UNSAFE.objectFieldOffset(
58                    ByteBuffer.class.getDeclaredField("isReadOnly"));
59        }
60        catch (ReflectiveOperationException e) {
61            throw new Error(e);
62        }
63    }
64
65    static final boolean BE = UNSAFE.isBigEndian();
66
67    static IllegalStateException newIllegalStateExceptionForMisalignedAccess(int index) {
68        return new IllegalStateException("Misaligned access at index: " + index);
69    }
70}
71