Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/LoadHubNode.java @ 19800:3362ba500371
Connect required Assumptions with answer to CHA query
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Wed, 11 Mar 2015 17:32:04 -0700 |
parents | 8fc336a04d77 |
children | deab43a789ad |
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/* * Copyright (c) 2011, 2015, 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.nodes.extended; import com.oracle.graal.api.meta.*; import com.oracle.graal.api.meta.Assumptions.AssumptionResult; import com.oracle.graal.compiler.common.type.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodeinfo.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; /** * Loads an object's hub. The object is not null-checked by this operation. */ @NodeInfo public final class LoadHubNode extends FloatingGuardedNode implements Lowerable, Canonicalizable, Virtualizable { public static final NodeClass<LoadHubNode> TYPE = NodeClass.create(LoadHubNode.class); @Input ValueNode value; public ValueNode getValue() { return value; } private static Stamp hubStamp(StampProvider stampProvider, ValueNode value) { assert value.stamp() instanceof ObjectStamp; return stampProvider.createHubStamp(((ObjectStamp) value.stamp())); } public LoadHubNode(@InjectedNodeParameter StampProvider stampProvider, ValueNode value) { this(stampProvider, value, null); } public LoadHubNode(@InjectedNodeParameter StampProvider stampProvider, ValueNode value, ValueNode guard) { super(TYPE, hubStamp(stampProvider, value), (GuardingNode) guard); assert value != guard; this.value = value; } @Override public void lower(LoweringTool tool) { if (tool.getLoweringStage() == LoweringTool.StandardLoweringStage.HIGH_TIER) { return; } tool.getLowerer().lower(this, tool); } @Override public ValueNode canonical(CanonicalizerTool tool) { MetaAccessProvider metaAccess = tool.getMetaAccess(); if (metaAccess != null && getValue().stamp() instanceof ObjectStamp) { ObjectStamp objectStamp = (ObjectStamp) getValue().stamp(); ResolvedJavaType exactType = null; if (objectStamp.isExactType()) { exactType = objectStamp.type(); } else if (objectStamp.type() != null && graph().getAssumptions() != null) { AssumptionResult<ResolvedJavaType> typeResult = objectStamp.type().findUniqueConcreteSubtype(); if (typeResult != null) { exactType = typeResult.getResult(); graph().getAssumptions().record(typeResult); } } if (exactType != null) { return ConstantNode.forConstant(stamp(), exactType.getObjectHub(), metaAccess); } } return this; } @Override public void virtualize(VirtualizerTool tool) { State state = tool.getObjectState(value); if (state != null) { Constant constantHub = state.getVirtualObject().type().getObjectHub(); tool.replaceWithValue(ConstantNode.forConstant(stamp(), constantHub, tool.getMetaAccessProvider(), graph())); } } }