1 /*
2 * Copyright (c) 2011, 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 */
23
24
25 package jdk.internal.vm.compiler.word;
26
27 // JaCoCo Exclude
28
29 /**
30 * Marker interface for location identities. A different location identity of two memory accesses
31 * guarantees that the two accesses do not interfere.
32 * <p>
33 * Clients of {@link LocationIdentity} must use {@link #equals(Object)}, not {@code ==}, when
34 * comparing two {@link LocationIdentity} values for equality. Likewise, they must not use
35 * {@link java.util.IdentityHashMap}s with {@link LocationIdentity} values as keys.
36 *
37 * @since 1.0
38 */
39 public abstract class LocationIdentity {
40
41 private static final class AnyLocationIdentity extends LocationIdentity {
42 @Override
43 public boolean isImmutable() {
44 return false;
|
1 /*
2 * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * The Universal Permissive License (UPL), Version 1.0
6 *
7 * Subject to the condition set forth below, permission is hereby granted to any
8 * person obtaining a copy of this software, associated documentation and/or
9 * data (collectively the "Software"), free of charge and under any and all
10 * copyright rights in the Software, and any and all patent rights owned or
11 * freely licensable by each licensor hereunder covering either (i) the
12 * unmodified Software as contributed to or provided by such licensor, or (ii)
13 * the Larger Works (as defined below), to deal in both
14 *
15 * (a) the Software, and
16 *
17 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
18 * one is included with the Software each a "Larger Work" to which the Software
19 * is contributed by such licensors),
20 *
21 * without restriction, including without limitation the rights to copy, create
22 * derivative works of, display, perform, and distribute the Software and make,
23 * use, sell, offer for sale, import, export, have made, and have sold the
24 * Software and the Larger Work(s), and to sublicense the foregoing rights on
25 * either these or other terms.
26 *
27 * This license is subject to the following condition:
28 *
29 * The above copyright notice and either this complete permission notice or at a
30 * minimum a reference to the UPL must be included in all copies or substantial
31 * portions of the Software.
32 *
33 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
34 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
35 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
36 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
37 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
38 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
39 * SOFTWARE.
40 */
41 package jdk.internal.vm.compiler.word;
42
43 // JaCoCo Exclude
44
45 /**
46 * Marker interface for location identities. A different location identity of two memory accesses
47 * guarantees that the two accesses do not interfere.
48 * <p>
49 * Clients of {@link LocationIdentity} must use {@link #equals(Object)}, not {@code ==}, when
50 * comparing two {@link LocationIdentity} values for equality. Likewise, they must not use
51 * {@link java.util.IdentityHashMap}s with {@link LocationIdentity} values as keys.
52 *
53 * @since 1.0
54 */
55 public abstract class LocationIdentity {
56
57 private static final class AnyLocationIdentity extends LocationIdentity {
58 @Override
59 public boolean isImmutable() {
60 return false;
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