Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/ValueNode.java @ 18970:edf3a7fdd067
Add utility methods to GuardsStage.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Tue, 27 Jan 2015 14:54:55 +0100 |
parents | c943ba97b2a7 |
children | 7e2c87dae93e |
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/* * Copyright (c) 2009, 2014, 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 com.oracle.graal.api.meta.*; import com.oracle.graal.compiler.common.type.*; import com.oracle.graal.graph.iterators.*; import com.oracle.graal.nodeinfo.*; /** * This class represents a value within the graph, including local variables, phis, and all other * instructions. */ @NodeInfo public abstract class ValueNode extends com.oracle.graal.graph.Node implements KindProvider { /** * The kind of this value. This is {@link Kind#Void} for instructions that produce no value. * This kind is guaranteed to be a {@linkplain Kind#getStackKind() stack kind}. */ protected Stamp stamp; public ValueNode(Stamp stamp) { this.stamp = stamp; } public final Stamp stamp() { return stamp; } public final void setStamp(Stamp stamp) { this.stamp = stamp; } @Override public final StructuredGraph graph() { return (StructuredGraph) super.graph(); } /** * Checks if the given stamp is different than the current one ( * {@code newStamp.equals(oldStamp) == false}). If it is different then the new stamp will * become the current stamp for this node. * * @return true if the stamp has changed, false otherwise. */ protected final boolean updateStamp(Stamp newStamp) { if (newStamp == null || newStamp.equals(stamp)) { return false; } else { stamp = newStamp; return true; } } /** * This method can be overridden by subclasses of {@link ValueNode} if they need to recompute * their stamp if their inputs change. A typical implementation will compute the stamp and pass * it to {@link #updateStamp(Stamp)}, whose return value can be used as the result of this * method. * * @return true if the stamp has changed, false otherwise. */ public boolean inferStamp() { return false; } public final Kind getKind() { return stamp().getStackKind(); } /** * 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; } private static final NodePredicate IS_CONSTANT = node -> node instanceof ConstantNode; public static NodePredicate isConstantPredicate() { return IS_CONSTANT; } /** * Checks whether this value represents the null constant. * * @return {@code true} if this value represents the null constant */ public final boolean isNullConstant() { JavaConstant value = asJavaConstant(); return value != null && value.isNull(); } /** * Convert this value to a constant if it is a constant, otherwise return null. * * @return the {@link JavaConstant} represented by this value if it is a constant; {@code null} * otherwise */ public final Constant asConstant() { if (this instanceof ConstantNode) { return ((ConstantNode) this).getValue(); } else { return null; } } public final JavaConstant asJavaConstant() { Constant value = asConstant(); if (value instanceof JavaConstant) { return (JavaConstant) value; } else { return null; } } public ValueNode asNode() { return this; } @Override public boolean isAllowedUsageType(InputType type) { if (getKind() != Kind.Void && type == InputType.Value) { return true; } else { return super.isAllowedUsageType(type); } } }