Mercurial > hg > truffle
view graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/DeoptimizationGroupingPhase.java @ 11725:45570e4fe8a9
Group Deoptimization which have the same FrameState
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 19 Sep 2013 12:14:56 +0200 |
parents | |
children | 3e4482a06170 |
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/* * Copyright (c) 2013, 2013, 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.phases.common; import java.util.*; import com.oracle.graal.nodes.*; import com.oracle.graal.phases.*; /** * This phase tries to find {@link DeoptimizeNode DeoptimizeNodes} which use the same * {@link FrameState} and merges them together. */ public class DeoptimizationGroupingPhase extends Phase { @Override protected void run(StructuredGraph graph) { for (FrameState fs : graph.getNodes(FrameState.class)) { FixedNode target = null; List<DeoptimizeNode> obsoletes = null; for (DeoptimizeNode deopt : fs.usages().filter(DeoptimizeNode.class)) { if (target == null) { target = deopt; } else { MergeNode merge; if (target instanceof DeoptimizeNode) { merge = graph.add(new MergeNode()); EndNode firstEnd = graph.add(new EndNode()); merge.addForwardEnd(firstEnd); target.predecessor().replaceFirstSuccessor(target, firstEnd); merge.setNext(target); obsoletes = new LinkedList<>(); target = merge; } else { merge = (MergeNode) target; } EndNode newEnd = graph.add(new EndNode()); merge.addForwardEnd(newEnd); deopt.predecessor().replaceFirstSuccessor(deopt, newEnd); obsoletes.add(deopt); } } if (obsoletes != null) { for (DeoptimizeNode obsolete : obsoletes) { obsolete.safeDelete(); } } } } }