001/*
002 * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.nodes.memory;
024
025/**
026 * Encapsulates properties of a node describing how it accesses the heap.
027 */
028public interface HeapAccess {
029
030    /**
031     * The types of (write/read) barriers attached to stores.
032     */
033    public enum BarrierType {
034        /**
035         * Primitive stores which do not necessitate barriers.
036         */
037        NONE,
038        /**
039         * Array object stores which necessitate precise barriers.
040         */
041        PRECISE,
042        /**
043         * Field object stores which necessitate imprecise barriers.
044         */
045        IMPRECISE
046    }
047
048    /**
049     * Gets the write barrier type for that particular access.
050     */
051    BarrierType getBarrierType();
052}