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annotate graal/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/Value.java @ 21728:99fe8116f3e8

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Make shared NO_VALUES array
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Wed, 03 Jun 2015 19:35:19 -0700
parents 48c1ebd24120
children e7f5ddef438d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2009, 2014, 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.meta;
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24
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25 /**
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26 * Interface for values manipulated by the compiler. All values have a {@linkplain Kind kind} and
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27 * are immutable.
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28 */
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29 public interface Value extends KindProvider, TrustedInterface {
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30
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31 Value[] NO_VALUES = new Value[0];
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32
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33 AllocatableValue ILLEGAL = new AllocatableValue(LIRKind.Illegal) {
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34
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35 @Override
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36 public String toString() {
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37 return "-";
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38 }
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39
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40 @Override
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41 public boolean equals(Object other) {
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42 // Due to de-serialization this object may exist multiple times. So we compare classes
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43 // instead of the individual objects. (This anonymous class has always the same meaning)
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44 return other != null && this.getClass() == other.getClass();
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45 }
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46 };
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47
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48 LIRKind getLIRKind();
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49
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50 /**
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51 * Returns the platform specific kind used to store this value.
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52 */
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53 PlatformKind getPlatformKind();
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54
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55 /**
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56 * Checks if this value is identical to {@code other}.
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57 *
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58 * Warning: Use with caution! Usually equivalence {@link #equals(Object)} is sufficient and
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59 * should be used.
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60 */
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61 @ExcludeFromIdentityComparisonVerification
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62 default boolean identityEquals(Value other) {
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63 return this == other;
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64 }
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65 }