Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/IsNullNode.java @ 5507:dc71b06d09f8
Moving classes from cri.ri to api.meta.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
---|---|
date | Thu, 07 Jun 2012 18:24:06 +0200 |
parents | 452f91ebdb54 |
children | e18ba36bfebc |
line wrap: on
line source
/* * 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.calc; import com.oracle.graal.api.meta.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /** * An IsNullNode will be true if the supplied value is null, and false if it is non-null. */ public final class IsNullNode extends BooleanNode implements Canonicalizable, LIRLowerable { @Input private ValueNode object; public ValueNode object() { return object; } /** * Constructs a new IsNullNode instruction. * * @param object the instruction producing the object to check against null */ public IsNullNode(ValueNode object) { super(StampFactory.condition()); assert object.kind() == RiKind.Object : object.kind(); this.object = object; } @Override public void generate(LIRGeneratorTool gen) { // Nothing to do. } @Override public boolean verify() { assertTrue(object() != null, "is null input must not be null"); assertTrue(object().kind().isObject(), "is null input must be an object"); return super.verify(); } @Override public ValueNode canonical(CanonicalizerTool tool) { RiConstant constant = object().asConstant(); if (constant != null) { assert constant.kind == RiKind.Object; return ConstantNode.forBoolean(constant.isNull(), graph()); } if (object.objectStamp().nonNull()) { return ConstantNode.forBoolean(false, graph()); } return this; } }