1/*
2 * Copyright (c) 2016, 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 org.graalvm.compiler.core.common.type;
24
25/**
26 * A pair of stamp with one being the stamp that can be trusted and the other one being a guess that
27 * needs a dynamic check to be used.
28 */
29public final class StampPair {
30
31    private final Stamp trustedStamp;
32    private final Stamp uncheckedStamp;
33
34    private StampPair(Stamp trustedStamp, Stamp uncheckedStamp) {
35        assert trustedStamp != null;
36        this.trustedStamp = trustedStamp;
37        this.uncheckedStamp = uncheckedStamp;
38    }
39
40    public static StampPair create(Stamp trustedStamp, Stamp uncheckedStamp) {
41        return new StampPair(trustedStamp, uncheckedStamp);
42    }
43
44    public static StampPair createSingle(Stamp stamp) {
45        return new StampPair(stamp, null);
46    }
47
48    public Stamp getUncheckedStamp() {
49        return uncheckedStamp;
50    }
51
52    public Stamp getTrustedStamp() {
53        return trustedStamp;
54    }
55
56    @Override
57    public String toString() {
58        if (uncheckedStamp == null) {
59            return trustedStamp.toString();
60        } else {
61            return trustedStamp + " (unchecked=" + uncheckedStamp + ")";
62        }
63    }
64}
65