1/*
2 * Copyright (c) 2016, 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 jdk.vm.ci.code.site;
24
25/**
26 * Represents a pointer to some location in the data section that should be {@link DataPatch
27 * patched} into the code.
28 */
29public final class DataSectionReference extends Reference {
30
31    private boolean initialized;
32    private int offset;
33
34    public DataSectionReference() {
35        // will be set after the data section layout is fixed
36        offset = 0xDEADDEAD;
37    }
38
39    public int getOffset() {
40        assert initialized;
41
42        return offset;
43    }
44
45    public void setOffset(int offset) {
46        assert !initialized;
47        initialized = true;
48
49        this.offset = offset;
50    }
51
52    @Override
53    public int hashCode() {
54        return offset;
55    }
56
57    @Override
58    public boolean equals(Object obj) {
59        if (this == obj) {
60            return true;
61        }
62        if (obj instanceof DataSectionReference) {
63            DataSectionReference that = (DataSectionReference) obj;
64            return this.offset == that.offset;
65        }
66        return false;
67    }
68
69    @Override
70    public String toString() {
71        if (initialized) {
72            return String.format("DataSection[0x%x]", offset);
73        } else {
74            return "DataSection[?]";
75        }
76    }
77}
78