Mercurial > hg > Members > kono > jpf-core

comparison src/main/gov/nasa/jpf/vm/Allocation.java @ 0:61d41facf527

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
initial v8 import (history reset)
author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
parents
children
comparison
equal deleted inserted replaced
-1:000000000000 0:61d41facf527
1 /*
2 * Copyright (C) 2014, United States Government, as represented by the
3 * Administrator of the National Aeronautics and Space Administration.
4 * All rights reserved.
5 *
6 * The Java Pathfinder core (jpf-core) platform is licensed under the
7 * Apache License, Version 2.0 (the "License"); you may not use this file except
8 * in compliance with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0.
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package gov.nasa.jpf.vm;
19
20 import gov.nasa.jpf.util.OATHash;
21
22 /**
23 * helper class for search global object id (SGOID) computation. This
24 * captures both allocation context and count.
25 *
26 * NOTE: this is used as a key for associative arrays, but we do
27 * allow destructive updates via init() in order to enable key
28 * caching for lookups that don't lead to new entries.
29 * THE CALLER HAS TO MAKE SURE init() IS NEVER CALLED ON A STORED KEY !!
30 */
31 public class Allocation {
32
33 final AllocationContext context;
34 final int count;
35 final int hash;
36
37 public Allocation (AllocationContext context, int count){
38 this.context = context;
39 this.count = count;
40 this.hash = OATHash.hash(context.hashCode(), count);
41 }
42
43 @Override
44 public boolean equals (Object o) {
45 if (o instanceof Allocation) {
46 Allocation other = (Allocation)o;
47
48 if (other.hash == hash) {
49 if (other.context.equals(context)) {
50 return true;
51 }
52 }
53 }
54
55 return false;
56 }
57
58 @Override
59 public int hashCode() {
60 return hash;
61 }
62 }