| /* |
| * Copyright (c) 2018, 2018, 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 org.graalvm.compiler.nodes.extended; |
| |
| import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2; |
| import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1; |
| |
| import org.graalvm.compiler.core.common.type.Stamp; |
| import org.graalvm.compiler.graph.Node; |
| import org.graalvm.compiler.graph.NodeClass; |
| import org.graalvm.compiler.graph.spi.Canonicalizable; |
| import org.graalvm.compiler.graph.spi.CanonicalizerTool; |
| import org.graalvm.compiler.nodeinfo.NodeInfo; |
| import org.graalvm.compiler.nodes.ConstantNode; |
| import org.graalvm.compiler.nodes.FixedWithNextNode; |
| import org.graalvm.compiler.nodes.ValueNode; |
| import org.graalvm.compiler.nodes.spi.Lowerable; |
| import org.graalvm.compiler.nodes.spi.LoweringTool; |
| import org.graalvm.compiler.nodes.spi.StampProvider; |
| |
| import jdk.vm.ci.meta.ConstantReflectionProvider; |
| import jdk.vm.ci.meta.MetaAccessProvider; |
| import jdk.vm.ci.meta.ResolvedJavaType; |
| |
| /** |
| * Loads the component hub for of the provided array hub. |
| * |
| * This is a fixed node because on certain VMs, for example the HotSpot VM, the read is only valid |
| * when the provided hub is actually an array hub (and not, e.g., a primitive hub), so this node |
| * must not float above a possible type check. Properly guarding this node would be possible too, |
| * but it is unlikely that the guard would be more flexible than just fixing the node in the control |
| * flow. |
| */ |
| @NodeInfo(cycles = CYCLES_2, size = SIZE_1) |
| public final class LoadArrayComponentHubNode extends FixedWithNextNode implements Lowerable, Canonicalizable.Unary<ValueNode> { |
| |
| public static final NodeClass<LoadArrayComponentHubNode> TYPE = NodeClass.create(LoadArrayComponentHubNode.class); |
| |
| private @Input ValueNode value; |
| |
| public static ValueNode create(ValueNode value, StampProvider stampProvider, MetaAccessProvider metaAccess, ConstantReflectionProvider constantReflection) { |
| Stamp stamp = stampProvider.createHubStamp(null); |
| return findSynonym(null, value, stamp, metaAccess, constantReflection); |
| } |
| |
| protected LoadArrayComponentHubNode(Stamp stamp, ValueNode value) { |
| super(TYPE, stamp); |
| this.value = value; |
| } |
| |
| @Override |
| public ValueNode getValue() { |
| return value; |
| } |
| |
| @Override |
| public void lower(LoweringTool tool) { |
| tool.getLowerer().lower(this, tool); |
| } |
| |
| @Override |
| public Node canonical(CanonicalizerTool tool, ValueNode forValue) { |
| return findSynonym(this, forValue, stamp, tool.getMetaAccess(), tool.getConstantReflection()); |
| } |
| |
| private static ValueNode findSynonym(LoadArrayComponentHubNode self, ValueNode forValue, Stamp stamp, MetaAccessProvider metaAccess, ConstantReflectionProvider constantReflection) { |
| if (forValue.isConstant()) { |
| ResolvedJavaType type = constantReflection.asJavaType(forValue.asConstant()); |
| if (type != null) { |
| return ConstantNode.forConstant(stamp, constantReflection.asObjectHub(type.getComponentType()), metaAccess); |
| } |
| } |
| return self != null ? self : new LoadArrayComponentHubNode(stamp, forValue); |
| } |
| } |