Mercurial > hg > truffle
view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/KlassLayoutHelperNode.java @ 18482:b8a622c3e99f
Move raw memory access operations to a separate interface.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Thu, 20 Nov 2014 17:00:19 +0100 |
parents | ed0fce2e999a |
children | 27d65fe58fef |
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/* * Copyright (c) 2014, 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.hotspot.replacements; import static com.oracle.graal.hotspot.HotSpotGraalRuntime.*; import static com.oracle.graal.hotspot.replacements.HotSpotReplacementsUtil.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.compiler.common.type.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.hotspot.meta.*; import com.oracle.graal.nodeinfo.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.HeapAccess.BarrierType; import com.oracle.graal.nodes.extended.*; import com.oracle.graal.nodes.spi.*; /** * Read Klass::_layout_helper and incorporate any useful stamp information based on any type * information in {@code klass}. */ @NodeInfo public class KlassLayoutHelperNode extends FloatingGuardedNode implements Canonicalizable, Lowerable { @Input protected ValueNode klass; public static KlassLayoutHelperNode create(ValueNode klass) { return new KlassLayoutHelperNode(klass); } public static KlassLayoutHelperNode create(ValueNode klass, ValueNode guard) { return new KlassLayoutHelperNode(klass, guard); } protected KlassLayoutHelperNode(ValueNode klass) { super(StampFactory.forKind(Kind.Int)); this.klass = klass; } protected KlassLayoutHelperNode(ValueNode klass, ValueNode guard) { super(StampFactory.forKind(Kind.Int), (GuardingNode) guard); this.klass = klass; } @Override public boolean inferStamp() { if (klass instanceof LoadHubNode) { LoadHubNode hub = (LoadHubNode) klass; Stamp hubStamp = hub.getValue().stamp(); if (hubStamp instanceof ObjectStamp) { ObjectStamp objectStamp = (ObjectStamp) hubStamp; ResolvedJavaType type = objectStamp.type(); if (type != null && !type.isJavaLangObject()) { if (!type.isArray() && !type.isInterface()) { /* * Definitely some form of instance type. */ return updateStamp(StampFactory.forInteger(Kind.Int, runtime().getConfig().klassLayoutHelperNeutralValue, Integer.MAX_VALUE)); } if (type.isArray()) { return updateStamp(StampFactory.forInteger(Kind.Int, Integer.MIN_VALUE, runtime().getConfig().klassLayoutHelperNeutralValue - 1)); } } } } return false; } @Override public Node canonical(CanonicalizerTool tool) { if (usages().isEmpty()) { return null; } else { if (klass.isConstant()) { long base = klass.asJavaConstant().asLong(); if (base != 0L) { Constant constant = stamp().readConstant(tool.getConstantReflection().getMemoryAccessProvider(), klass.asJavaConstant(), runtime().getConfig().klassLayoutHelperOffset); return ConstantNode.forConstant(stamp(), constant, tool.getMetaAccess()); } } if (klass instanceof LoadHubNode) { LoadHubNode hub = (LoadHubNode) klass; Stamp hubStamp = hub.getValue().stamp(); if (hubStamp instanceof ObjectStamp) { ObjectStamp ostamp = (ObjectStamp) hubStamp; HotSpotResolvedObjectType type = (HotSpotResolvedObjectType) ostamp.type(); if (type != null && type.isArray() && !type.getComponentType().isPrimitive()) { // The layout for all object arrays is the same. Constant constant = stamp().readConstant(tool.getConstantReflection().getMemoryAccessProvider(), type.klass(), runtime().getConfig().klassLayoutHelperOffset); return ConstantNode.forConstant(stamp(), constant, tool.getMetaAccess()); } } } return this; } } @Override public void lower(LoweringTool tool) { if (tool.getLoweringStage() == LoweringTool.StandardLoweringStage.HIGH_TIER) { return; } LocationNode location = ConstantLocationNode.create(KLASS_LAYOUT_HELPER_LOCATION, Kind.Int, runtime().getConfig().klassLayoutHelperOffset, graph()); assert !klass.isConstant(); graph().replaceFloating(this, graph().unique(FloatingReadNode.create(klass, location, null, stamp(), getGuard(), BarrierType.NONE))); } }