Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/LoadHubNode.java @ 14996:88d77743dff3
do not implicitly set guard to null in LoadHubNode
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Mon, 07 Apr 2014 10:40:37 +0200 |
parents | 75a67ebd50e8 |
children | 2c0cfbf454b5 |
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/* * Copyright (c) 2011, 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.ResolvedJavaType.Representation; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /** * Loads an object's {@linkplain Representation#ObjectHub hub}. The object is not null-checked by * this operation. */ public final class LoadHubNode extends FloatingGuardedNode implements Lowerable, Canonicalizable, Virtualizable { @Input private ValueNode object; public ValueNode object() { return object; } public LoadHubNode(ValueNode object, Kind kind) { super(getKind(kind), null); this.object = object; } public LoadHubNode(ValueNode object, Kind kind, ValueNode guard) { super(getKind(kind), (GuardingNode) guard); assert object != guard; assert guard != null; this.object = object; } private static Stamp getKind(Kind kind) { return kind == Kind.Object ? StampFactory.objectNonNull() : StampFactory.forKind(kind); } @Override public void lower(LoweringTool tool) { tool.getLowerer().lower(this, tool); } @Override public Node canonical(CanonicalizerTool tool) { MetaAccessProvider metaAccess = tool.getMetaAccess(); if (metaAccess != null && object.stamp() instanceof ObjectStamp) { ObjectStamp stamp = (ObjectStamp) object.stamp(); ResolvedJavaType exactType; if (stamp.isExactType()) { exactType = stamp.type(); } else if (stamp.type() != null && tool.assumptions().useOptimisticAssumptions()) { exactType = stamp.type().findUniqueConcreteSubtype(); if (exactType != null) { tool.assumptions().recordConcreteSubtype(stamp.type(), exactType); } } else { exactType = null; } if (exactType != null) { return ConstantNode.forConstant(exactType.getEncoding(Representation.ObjectHub), metaAccess, graph()); } } return this; } @Override public void virtualize(VirtualizerTool tool) { State state = tool.getObjectState(object); if (state != null) { Constant constantHub = state.getVirtualObject().type().getEncoding(Representation.ObjectHub); tool.replaceWithValue(ConstantNode.forConstant(constantHub, tool.getMetaAccessProvider(), graph())); } } }