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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/FloatableAccessNode.java @ 13153:ae0001b445c0

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Common base interface for nodes in the memory graph.
author Roland Schatz <roland.schatz@oracle.com>
date Mon, 25 Nov 2013 17:10:22 +0100
parents b05e1ff3aac0
children 1734954cc73d
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86ef0438d1d3 Generalize FloatingReadPhase to support arbitrary floatable access nodes.
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1 /*
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2 * Copyright (c) 2013, 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
86ef0438d1d3 Generalize FloatingReadPhase to support arbitrary floatable access nodes.
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
86ef0438d1d3 Generalize FloatingReadPhase to support arbitrary floatable access nodes.
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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
86ef0438d1d3 Generalize FloatingReadPhase to support arbitrary floatable access nodes.
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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
86ef0438d1d3 Generalize FloatingReadPhase to support arbitrary floatable access nodes.
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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.nodes.extended;
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24
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25 import com.oracle.graal.api.meta.*;
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26 import com.oracle.graal.nodes.*;
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27 import com.oracle.graal.nodes.type.*;
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28
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29 /**
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30 * An {@link AccessNode} that can be converted to a {@link FloatingAccessNode}.
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31 */
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32 public abstract class FloatableAccessNode extends AccessNode {
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33
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34 public FloatableAccessNode(ValueNode object, ValueNode location, Stamp stamp) {
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35 super(object, location, stamp);
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36 }
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37
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38 public FloatableAccessNode(ValueNode object, ValueNode location, Stamp stamp, GuardingNode guard, BarrierType barrierType, boolean compressible) {
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39 super(object, location, stamp, guard, barrierType, compressible);
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40 }
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41
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42 public FloatableAccessNode(ValueNode object, ValueNode location, Stamp stamp, BarrierType barrierType, boolean compressible) {
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43 super(object, location, stamp, barrierType, compressible);
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44 }
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45
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46 public abstract FloatingAccessNode asFloatingNode(MemoryNode lastLocationAccess);
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47
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48 /**
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49 * AccessNodes can float only if their location identities are not ANY_LOCATION. Furthermore, in
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50 * case G1 is enabled any access (read) to the java.lang.ref.Reference.referent field which has
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51 * an attached write barrier with pre-semantics can not also float.
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52 */
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53 public boolean canFloat() {
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54 return location().getLocationIdentity() != LocationIdentity.ANY_LOCATION && getBarrierType() == BarrierType.NONE;
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55 }
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56 }