1 /* 2 * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 25 package org.graalvm.compiler.nodes.memory; 26 27 /** 28 * Encapsulates properties of a node describing how it accesses the heap. 29 */ 30 public interface HeapAccess { 31 32 /** 33 * The types of (write/read) barriers attached to stores. 34 */ 35 enum BarrierType { 36 /** 37 * Primitive access which do not necessitate barriers. 38 */ 39 NONE, 40 /** 41 * Array object access. 42 */ 43 ARRAY, 44 /** 45 * Field object access. 46 */ 47 FIELD, 48 /** 49 * Unknown (aka field or array) object access. 50 */ 51 UNKNOWN, 52 /** 53 * Weak field access (e.g. Hotspot's Reference.referent field). 54 */ 55 WEAK_FIELD 56 } 57 58 /** 59 * Gets the write barrier type for that particular access. 60 */ 61 BarrierType getBarrierType(); 62 }