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annotate graal/com.oracle.jvmci.options/src/com/oracle/jvmci/options/StableOptionValue.java @ 21785:06cd28cccc64
[SPARC] Create SPARC specific address nodes.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Mon, 08 Jun 2015 19:19:51 +0200 |
parents | 47bebae7454f |
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1 /* |
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.oracle.jvmci.options; |
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24 |
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25 /** |
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26 * An option that always returns the same {@linkplain #getValue() value}. |
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27 */ |
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28 public class StableOptionValue<T> extends OptionValue<T> { |
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29 |
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30 /** |
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31 * Creates a stable option value. |
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32 */ |
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33 public StableOptionValue(T value) { |
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34 super(value); |
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35 } |
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36 |
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37 /** |
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38 * Used to assert the invariant for stability. Without using locks, this check is not safe |
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39 * against races and so it's only an assertion. |
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40 */ |
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41 private boolean getValueCalled; |
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42 |
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43 /** |
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44 * Creates an uninitialized stable option value for a subclass that initializes itself |
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45 * {@link #defaultValue() lazily}. |
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46 */ |
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47 public StableOptionValue() { |
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48 } |
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49 |
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50 /** |
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51 * Gets the value of this option. |
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52 */ |
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53 @Override |
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54 public final T getValue() { |
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55 T result = super.getValue(); |
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56 assert initGetValueCalled(); |
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57 return result; |
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58 } |
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59 |
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60 private boolean initGetValueCalled() { |
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61 getValueCalled = true; |
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62 return true; |
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63 } |
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64 |
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65 /** |
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66 * {@inheritDoc} |
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67 * <p> |
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68 * This must only be called if {@link #getValue()} has never been called. |
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69 */ |
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70 @Override |
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71 public final void setValue(Object v) { |
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72 assert !getValueCalled; |
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73 super.setValue(v); |
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74 } |
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75 } |