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annotate graal/com.oracle.max.graal.compiler/src/com/oracle/max/graal/compiler/phases/ConvertDeoptimizeToGuardPhase.java @ 4548:f55914bc1d67

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Added experimental ConvertDeoptimizeToGuardPhase.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Thu, 09 Feb 2012 21:26:26 +0100
parents
children 7cb57ac24ab8
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4548
f55914bc1d67 Added experimental ConvertDeoptimizeToGuardPhase.
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1 /*
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2 * Copyright (c) 2011, 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
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6 * under the terms of the GNU General Public License version 2 only, as
f55914bc1d67 Added experimental ConvertDeoptimizeToGuardPhase.
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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
f55914bc1d67 Added experimental ConvertDeoptimizeToGuardPhase.
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
f55914bc1d67 Added experimental ConvertDeoptimizeToGuardPhase.
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
f55914bc1d67 Added experimental ConvertDeoptimizeToGuardPhase.
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12 * version 2 for more details (a copy is included in the LICENSE file that
f55914bc1d67 Added experimental ConvertDeoptimizeToGuardPhase.
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13 * accompanied this code).
f55914bc1d67 Added experimental ConvertDeoptimizeToGuardPhase.
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14 *
f55914bc1d67 Added experimental ConvertDeoptimizeToGuardPhase.
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15 * You should have received a copy of the GNU General Public License version
f55914bc1d67 Added experimental ConvertDeoptimizeToGuardPhase.
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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.
f55914bc1d67 Added experimental ConvertDeoptimizeToGuardPhase.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
f55914bc1d67 Added experimental ConvertDeoptimizeToGuardPhase.
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20 * or visit www.oracle.com if you need additional information or have any
f55914bc1d67 Added experimental ConvertDeoptimizeToGuardPhase.
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21 * questions.
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22 */
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23 package com.oracle.max.graal.compiler.phases;
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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.max.graal.graph.*;
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28 import com.oracle.max.graal.nodes.*;
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29
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30 public class ConvertDeoptimizeToGuardPhase extends Phase {
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31
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32 private static BeginNode findBeginNode(Node startNode) {
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33 Node n = startNode;
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34 while (true) {
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35 if (n instanceof BeginNode) {
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36 return (BeginNode) n;
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37 } else {
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38 n = n.predecessor();
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39 }
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40 }
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41 }
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42
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43 @Override
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44 protected void run(final StructuredGraph graph) {
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45 List<DeoptimizeNode> nodes = graph.getNodes(DeoptimizeNode.class).snapshot();
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46 if (nodes.size() == 0) {
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47 return;
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48 }
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49
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50 for (DeoptimizeNode d : nodes) {
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51 BeginNode myBeginNode = findBeginNode(d);
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52 Node controlSplit = myBeginNode.predecessor();
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53
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54 if (controlSplit instanceof IfNode) {
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55 IfNode ifNode = (IfNode) controlSplit;
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56 BeginNode otherBegin = ifNode.trueSuccessor();
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57 BooleanNode conditionNode = ifNode.compare();
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58 if (myBeginNode == ifNode.trueSuccessor()) {
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59 conditionNode = conditionNode.negate();
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60 otherBegin = ifNode.falseSuccessor();
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61 }
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62 BeginNode ifBlockBegin = findBeginNode(ifNode);
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63 graph.unique(new GuardNode(conditionNode, ifBlockBegin));
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64 otherBegin.replaceAtUsages(ifBlockBegin);
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65 FixedNode next = otherBegin.next();
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66 otherBegin.setNext(null);
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67 ifNode.replaceAtPredecessors(next);
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68 }
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69 }
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70
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71 new DeadCodeEliminationPhase().apply(graph);
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72 }
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73 }