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annotate graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/DeoptimizationGroupingPhase.java @ 11725:45570e4fe8a9

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Group Deoptimization which have the same FrameState
author Gilles Duboscq <duboscq@ssw.jku.at>
date Thu, 19 Sep 2013 12:14:56 +0200
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children 3e4482a06170
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11725
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1 /*
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2 * Copyright (c) 2013, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
45570e4fe8a9 Group Deoptimization which have the same FrameState
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
45570e4fe8a9 Group Deoptimization which have the same FrameState
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
45570e4fe8a9 Group Deoptimization which have the same FrameState
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
45570e4fe8a9 Group Deoptimization which have the same FrameState
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.phases.common;
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24
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25 import java.util.*;
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26
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27 import com.oracle.graal.nodes.*;
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28 import com.oracle.graal.phases.*;
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29
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30 /**
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31 * This phase tries to find {@link DeoptimizeNode DeoptimizeNodes} which use the same
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32 * {@link FrameState} and merges them together.
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33 */
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34 public class DeoptimizationGroupingPhase extends Phase {
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35
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36 @Override
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37 protected void run(StructuredGraph graph) {
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38 for (FrameState fs : graph.getNodes(FrameState.class)) {
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39 FixedNode target = null;
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40 List<DeoptimizeNode> obsoletes = null;
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41 for (DeoptimizeNode deopt : fs.usages().filter(DeoptimizeNode.class)) {
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42 if (target == null) {
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43 target = deopt;
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44 } else {
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45 MergeNode merge;
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46 if (target instanceof DeoptimizeNode) {
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47 merge = graph.add(new MergeNode());
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48 EndNode firstEnd = graph.add(new EndNode());
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49 merge.addForwardEnd(firstEnd);
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50 target.predecessor().replaceFirstSuccessor(target, firstEnd);
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51 merge.setNext(target);
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52 obsoletes = new LinkedList<>();
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53 target = merge;
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54 } else {
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55 merge = (MergeNode) target;
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56 }
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57 EndNode newEnd = graph.add(new EndNode());
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58 merge.addForwardEnd(newEnd);
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59 deopt.predecessor().replaceFirstSuccessor(deopt, newEnd);
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60 obsoletes.add(deopt);
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61 }
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62 }
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63 if (obsoletes != null) {
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64 for (DeoptimizeNode obsolete : obsoletes) {
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65 obsolete.safeDelete();
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66 }
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67 }
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68 }
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69 }
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70 }