Mercurial > hg > truffle
view graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/LocationIdentity.java @ 18259:e1b2489393f4
added global map to ensure each NamedLocationIdentity object has a unique name which can be used for implementing .equals() and .hashCode()
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 05 Nov 2014 17:04:18 +0100 |
parents | 70df63b02309 |
children | 85f5227a7a37 |
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/* * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.graal.api.meta; /** * Marker interface for location identities. Apart from the special values {@link #ANY_LOCATION} and * {@link #FINAL_LOCATION}, a different location identity of two memory accesses guarantees that the * two accesses do not interfere. */ public interface LocationIdentity { /** * Denotes any location. A write to such a location kills all values in a memory map during an * analysis of memory accesses. A read from this location cannot be moved or coalesced with * other reads because its interaction with other reads is not known. */ LocationIdentity ANY_LOCATION = NamedLocationIdentity.create("ANY_LOCATION", false); /** * Denotes the location of a value that is guaranteed to be unchanging. */ LocationIdentity FINAL_LOCATION = NamedLocationIdentity.create("FINAL_LOCATION", true); /** * Denotes the location of the length field of a Java array. */ LocationIdentity ARRAY_LENGTH_LOCATION = NamedLocationIdentity.create("[].length", true); /** * Denotes a location is unchanging in all cases. Not that this is different than the Java * notion of final which only requires definite assignment. */ default boolean isImmutable() { return false; } }