Mercurial > hg > Members > kono > jpf-core

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

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