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
25import java.util.Objects;
26
27import jdk.vm.ci.meta.VMConstant;
28
29/**
30 * Represents a code site that references some data. The associated data can be either a
31 * {@link DataSectionReference reference} to the data section, or it may be an inlined
32 * {@link VMConstant} that needs to be patched.
33 */
34public final class DataPatch extends Site {
35
36    public Reference reference;
37    public Object note;
38
39    public DataPatch(int pcOffset, Reference reference) {
40        super(pcOffset);
41        this.reference = reference;
42        this.note = null;
43    }
44
45    public DataPatch(int pcOffset, Reference reference, Object note) {
46        super(pcOffset);
47        this.reference = reference;
48        this.note = note;
49    }
50
51    @Override
52    public String toString() {
53        if (note != null) {
54            return String.format("%d[<data patch referring to %s>, note: %s]", pcOffset, reference.toString(), note.toString());
55        } else {
56            return String.format("%d[<data patch referring to %s>]", pcOffset, reference.toString());
57        }
58    }
59
60    @Override
61    public boolean equals(Object obj) {
62        if (this == obj) {
63            return true;
64        }
65        if (obj instanceof DataPatch) {
66            DataPatch that = (DataPatch) obj;
67            if (this.pcOffset == that.pcOffset && Objects.equals(this.reference, that.reference) && Objects.equals(this.note, that.note)) {
68                return true;
69            }
70        }
71        return false;
72    }
73}
74