Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/LoadHubNode.java @ 6460:78e352577028
renamed ReadHubNode to LoadHubNode to be imply higher level operation (c.f. UnsafeLoadNode vs ReadNode)
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 28 Sep 2012 15:33:29 +0200 |
parents | graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/ReadHubNode.java@a938e15e3bd7 |
children | 41f0849e107b |
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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.JavaType.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /** * Loads an object's {@linkplain Representation#ObjectHub hub}, null-checking the object first. */ public final class LoadHubNode extends FloatingNode implements Lowerable, Canonicalizable { @Input private ValueNode object; public ValueNode object() { return object; } public LoadHubNode(ValueNode object) { super(StampFactory.objectNonNull()); this.object = object; } @Override public void lower(LoweringTool tool) { tool.getRuntime().lower(this, tool); } @Override public ValueNode canonical(CanonicalizerTool tool) { MetaAccessProvider runtime = tool.runtime(); if (runtime != null) { ObjectStamp stamp = object.objectStamp(); ResolvedJavaType exactType; if (stamp.isExactType()) { exactType = stamp.type(); } else if (stamp.type() != null && tool.assumptions() != null) { exactType = stamp.type().uniqueConcreteSubtype(); if (exactType != null) { tool.assumptions().recordConcreteSubtype(stamp.type(), exactType); } } else { exactType = null; } if (exactType != null) { return ConstantNode.forConstant(exactType.getEncoding(Representation.ObjectHub), runtime, graph()); } } return this; } @NodeIntrinsic public static native Object loadHub(Object object); }