Mercurial > hg > graal-jvmci-8
view graal/com.oracle.max.graal.nodes/src/com/oracle/max/graal/nodes/extended/ValueAnchorNode.java @ 4309:4a609a685fa4
changes to Node structures:
* add more uses of higher-level graph manipulation methods
* CanonicalierPhase cleanup
* introduce FloatingReadNode, make ReadNode an ordinary fixed nodeToBlock
* let Canonicalizable.canonical return ValueNode (instead of Node)
author | Lukas Stadler <lukas.stadler@jku.at> |
---|---|
date | Tue, 17 Jan 2012 19:45:39 +0100 |
parents | 0768bf0a4898 |
children | 72d099e5be61 |
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/* * Copyright (c) 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.max.graal.nodes.extended; import com.oracle.max.cri.ci.*; import com.oracle.max.graal.graph.*; import com.oracle.max.graal.nodes.*; import com.oracle.max.graal.nodes.calc.*; import com.oracle.max.graal.nodes.spi.*; import com.oracle.max.graal.nodes.type.*; /** * The ValueAnchor instruction keeps non-CFG (floating) nodes above a certain point in the graph. */ public final class ValueAnchorNode extends FixedWithNextNode implements Canonicalizable, LIRLowerable, Node.IterableNodeType { @Input private ValueNode object; public ValueNode object() { return object; } public ValueAnchorNode(ValueNode object) { super(StampFactory.illegal()); this.object = object; } @Override public void generate(LIRGeneratorTool gen) { // Nothing to emit, since this is node is used for structural purposes only. } @Override public ValueNode canonical(CanonicalizerTool tool) { if (object == null) { return next(); } if (object instanceof ConstantNode) { return next(); } if (object instanceof IntegerDivNode || object instanceof IntegerRemNode) { if (((ArithmeticNode) object).y().isConstant()) { CiConstant constant = ((ArithmeticNode) object).y().asConstant(); assert constant.kind == object.kind() : constant.kind + " != " + object.kind(); if (constant.asLong() != 0) { return next(); } } } return this; } }