| /* |
| * Copyright (c) 2013, 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 org.graalvm.compiler.nodes; |
| |
| import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0; |
| import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0; |
| |
| import org.graalvm.compiler.core.common.type.Stamp; |
| import org.graalvm.compiler.graph.IterableNodeType; |
| 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.extended.GuardingNode; |
| import org.graalvm.compiler.nodes.spi.LIRLowerable; |
| import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; |
| import org.graalvm.compiler.nodes.spi.ValueProxy; |
| import org.graalvm.compiler.nodes.spi.Virtualizable; |
| import org.graalvm.compiler.nodes.spi.VirtualizerTool; |
| import org.graalvm.compiler.nodes.virtual.VirtualObjectNode; |
| |
| import jdk.vm.ci.meta.JavaKind; |
| |
| /** |
| * A node that changes the type of its input, usually narrowing it. For example, a GuardedValueNode |
| * is used to keep the nodes depending on guards inside a loop during speculative guard movement. |
| * |
| * A GuardedValueNode will only go away if its guard is null or {@link StructuredGraph#start()}. |
| */ |
| @NodeInfo(cycles = CYCLES_0, size = SIZE_0) |
| public final class GuardedValueNode extends FloatingGuardedNode implements LIRLowerable, Virtualizable, IterableNodeType, Canonicalizable, ValueProxy { |
| |
| public static final NodeClass<GuardedValueNode> TYPE = NodeClass.create(GuardedValueNode.class); |
| @Input ValueNode object; |
| protected final Stamp piStamp; |
| |
| public GuardedValueNode(ValueNode object, GuardingNode guard, Stamp stamp) { |
| super(TYPE, computeStamp(stamp, object), guard); |
| this.object = object; |
| this.piStamp = stamp; |
| } |
| |
| public GuardedValueNode(ValueNode object, GuardingNode guard) { |
| this(object, guard, object.stamp()); |
| } |
| |
| public ValueNode object() { |
| return object; |
| } |
| |
| @Override |
| public void generate(NodeLIRBuilderTool generator) { |
| if (object.getStackKind() != JavaKind.Void && object.getStackKind() != JavaKind.Illegal) { |
| generator.setResult(this, generator.operand(object)); |
| } |
| } |
| |
| @Override |
| public boolean inferStamp() { |
| return updateStamp(computeStamp(piStamp, object())); |
| } |
| |
| static Stamp computeStamp(Stamp piStamp, ValueNode object) { |
| return piStamp.improveWith(object.stamp()); |
| } |
| |
| @Override |
| public void virtualize(VirtualizerTool tool) { |
| ValueNode alias = tool.getAlias(object()); |
| if (alias instanceof VirtualObjectNode) { |
| tool.replaceWithVirtual((VirtualObjectNode) alias); |
| } |
| } |
| |
| @Override |
| public Node canonical(CanonicalizerTool tool) { |
| if (getGuard() == null) { |
| if (stamp().equals(object().stamp())) { |
| return object(); |
| } else { |
| return new PiNode(object(), stamp()); |
| } |
| } |
| return this; |
| } |
| |
| @Override |
| public ValueNode getOriginalNode() { |
| return object; |
| } |
| } |