/*
 * Copyright (c) 2013, 2019, 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.
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package org.graalvm.compiler.nodes.memory;

/**
 * Encapsulates properties of a node describing how it accesses the heap.
 */
public interface HeapAccess {

    /**
     * The types of (write/read) barriers attached to stores.
     */
    enum BarrierType {
        /**
         * Primitive access which do not necessitate barriers.
         */
        NONE,
        /**
         * Array object access.
         */
        ARRAY,
        /**
         * Field object access.
         */
        FIELD,
        /**
         * Unknown (aka field or array) object access.
         */
        UNKNOWN,
        /**
         * Weak field access (e.g. Hotspot's Reference.referent field).
         */
        WEAK_FIELD
    }

    /**
     * Gets the write barrier type for that particular access.
     */
    BarrierType getBarrierType();
}