Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/ValueNode.java @ 5391:5097f21f6c2b
add a new simple CheckCast elimination phase
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 11 May 2012 16:00:00 +0200 |
parents | b6aaf6de4053 |
children | 141817e206d4 |
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/* * Copyright (c) 2009, 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; import java.util.*; import com.oracle.graal.graph.*; import com.oracle.graal.nodes.type.*; import com.oracle.max.cri.ci.*; import com.oracle.max.cri.ri.*; /** * This class represents a value within the graph, including local variables, phis, and * all other instructions. */ public abstract class ValueNode extends ScheduledNode implements StampProvider { /** * The kind of this value. This is {@link CiKind#Void} for instructions that produce no value. * This kind is guaranteed to be a {@linkplain CiKind#stackKind() stack kind}. */ private Stamp stamp; @Input(notDataflow = true) private NodeInputList<Node> dependencies; /** * This collection keeps dependencies that should be observed while scheduling (guards, etc.). */ public NodeInputList<Node> dependencies() { return dependencies; } public ValueNode(Stamp stamp) { this.stamp = stamp; this.dependencies = new NodeInputList<>(this); assert kind() != null && kind() == kind().stackKind() : kind() + " != " + kind().stackKind(); } public ValueNode(Stamp stamp, Node... dependencies) { this.stamp = stamp; this.dependencies = new NodeInputList<>(this, dependencies); assert kind() != null && kind() == kind().stackKind() : kind() + " != " + kind().stackKind(); } public ValueNode(Stamp stamp, List<Node> dependencies) { this.stamp = stamp; this.dependencies = new NodeInputList<>(this, dependencies); assert kind() != null && kind() == kind().stackKind() : kind() + " != " + kind().stackKind(); } public Stamp stamp() { return stamp; } public void setStamp(Stamp stamp) { this.stamp = stamp; } public CiKind kind() { return stamp.kind(); } /** * Checks whether this value is a constant (i.e. it is of type {@link ConstantNode}. * @return {@code true} if this value is a constant */ public final boolean isConstant() { return this instanceof ConstantNode; } /** * Checks whether this value represents the null constant. * @return {@code true} if this value represents the null constant */ public final boolean isNullConstant() { return this instanceof ConstantNode && ((ConstantNode) this).value.isNull(); } /** * Convert this value to a constant if it is a constant, otherwise return null. * @return the {@link CiConstant} represented by this value if it is a constant; {@code null} * otherwise */ public final CiConstant asConstant() { if (this instanceof ConstantNode) { return ((ConstantNode) this).value; } return null; } /** * Computes the exact type of the result of this node, if possible. * @return the exact type of the result of this node, if it is known; {@code null} otherwise */ public final RiResolvedType exactType() { return stamp.exactType(); } /** * Computes the declared type of the result of this node, if possible. * @return the declared type of the result of this node, if it is known; {@code null} otherwise */ public final RiResolvedType declaredType() { return stamp.declaredType(); } @Override public Map<Object, Object> getDebugProperties() { Map<Object, Object> properties = super.getDebugProperties(); if (!dependencies.isEmpty()) { StringBuilder str = new StringBuilder(); for (int i = 0; i < dependencies.size(); i++) { str.append(i == 0 ? "" : ", ").append(dependencies.get(i) == null ? "null" : dependencies.get(i).toString(Verbosity.Id)); } properties.put("dependencies", str.toString()); } return properties; } }