Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/ValueAnchorNode.java @ 11727:271ffa2d36b3
Clean up value anchors connected to fixed nodes.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Thu, 19 Sep 2013 15:53:09 +0200 |
parents | f12b418ebc74 |
children | 9a747d8e0d0f |
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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.graal.nodes.extended; import com.oracle.graal.graph.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; import com.oracle.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, IterableNodeType, Virtualizable, GuardingNode { @Input private ValueNode anchored; public ValueAnchorNode(ValueNode value) { super(StampFactory.dependency()); this.anchored = value; } @Override public void generate(LIRGeneratorTool gen) { // Nothing to emit, since this node is used for structural purposes only. } public ValueNode getAnchoredNode() { return anchored; } @Override public ValueNode canonical(CanonicalizerTool tool) { if (anchored != null && !anchored.isConstant() && !(anchored instanceof FixedNode)) { // Found entry that needs this anchor. return this; } if (usages().isNotEmpty()) { // A not uses this anchor => anchor is necessary. return this; } // Anchor is not necessary any more => remove. return null; } @Override public void virtualize(VirtualizerTool tool) { if (anchored != null && !(anchored instanceof AbstractBeginNode)) { State state = tool.getObjectState(anchored); if (state == null || state.getState() != EscapeState.Virtual) { return; } } tool.delete(); } public void removeAnchoredNode() { this.updateUsages(anchored, null); this.anchored = null; } }