Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/LocationIdentity.java @ 18231:70df63b02309
Use LocationIdentity.isImmutable instead of testing against FINAL_LOCATION
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Mon, 03 Nov 2014 13:37:10 -0800 |
parents | 9d864856336a |
children | e1b2489393f4 |
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1 /* |
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2 * Copyright (c) 2011, 2012, 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.graal.api.meta; |
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24 |
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25 /** |
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26 * Marker interface for location identities. Apart from the special values {@link #ANY_LOCATION} and |
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27 * {@link #FINAL_LOCATION}, a different location identity of two memory accesses guarantees that the |
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28 * two accesses do not interfere. |
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29 */ |
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30 public interface LocationIdentity { |
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31 |
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32 /** |
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33 * Denotes any location. A write to such a location kills all values in a memory map during an |
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34 * analysis of memory accesses. A read from this location cannot be moved or coalesced with |
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35 * other reads because its interaction with other reads is not known. |
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36 */ |
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37 LocationIdentity ANY_LOCATION = new NamedLocationIdentity("ANY_LOCATION"); |
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38 |
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39 /** |
18231
70df63b02309
Use LocationIdentity.isImmutable instead of testing against FINAL_LOCATION
Tom Rodriguez <tom.rodriguez@oracle.com>
parents:
14019
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40 * Denotes the location of a value that is guaranteed to be unchanging. |
9792
06dc2d2324d6
pulled LocationIdentity into a top level class and moved it to the api.meta project
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41 */ |
18231
70df63b02309
Use LocationIdentity.isImmutable instead of testing against FINAL_LOCATION
Tom Rodriguez <tom.rodriguez@oracle.com>
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42 LocationIdentity FINAL_LOCATION = new NamedLocationIdentity("FINAL_LOCATION", true); |
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43 |
14019
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support canonicalization of arraylength in ReadNode
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44 /** |
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45 * Denotes the location of the length field of a Java array. |
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46 */ |
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47 LocationIdentity ARRAY_LENGTH_LOCATION = new NamedLocationIdentity("[].length", true); |
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48 |
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49 /** |
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50 * Denotes a location is unchanging in all cases. Not that this is different than the Java |
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51 * notion of final which only requires definite assignment. |
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52 */ |
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53 default boolean isImmutable() { |
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54 return false; |
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55 } |
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56 } |