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annotate graal/com.oracle.max.graal.compiler/src/com/oracle/max/graal/compiler/phases/ConvertDeoptimizeToGuardPhase.java @ 4682:7cb57ac24ab8

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Better ConvertDeoptimizeToGuardPhase (experimental). Spelling fixes.
author Andreas Woess <andreas.woess@jku.at>
date Fri, 24 Feb 2012 13:42:24 +0100
parents f55914bc1d67
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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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
f55914bc1d67 Added experimental ConvertDeoptimizeToGuardPhase.
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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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
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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.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.debug.*;
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28 import com.oracle.max.graal.graph.*;
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29 import com.oracle.max.graal.nodes.*;
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30 import com.oracle.max.graal.nodes.util.*;
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31
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32 public class ConvertDeoptimizeToGuardPhase extends Phase {
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33
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34 private static BeginNode findBeginNode(Node startNode) {
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35 Node n = startNode;
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36 while (true) {
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37 if (n instanceof BeginNode) {
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38 return (BeginNode) n;
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39 } else {
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40 n = n.predecessor();
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41 }
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42 }
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43 }
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44
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45 @Override
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46 protected void run(final StructuredGraph graph) {
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47 if (graph.getNodes(DeoptimizeNode.class).isEmpty()) {
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48 return;
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49 }
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50
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51 for (DeoptimizeNode d : graph.getNodes(DeoptimizeNode.class)) {
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52 visitDeoptBranch(findBeginNode(d), d, graph);
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53 }
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54
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55 new DeadCodeEliminationPhase().apply(graph);
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56 }
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57
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58 private void visitDeoptBranch(BeginNode deoptBegin, DeoptimizeNode deopt, StructuredGraph graph) {
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59 if (deoptBegin instanceof MergeNode) {
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60 MergeNode mergeNode = (MergeNode) deoptBegin;
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61 Debug.log("Eliminating %s followed by %s", mergeNode, deopt);
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62 List<EndNode> ends = mergeNode.forwardEnds().snapshot();
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63 for (EndNode end : ends) {
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64 if (!end.isDeleted()) {
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65 BeginNode beginNode = findBeginNode(end);
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66 visitDeoptBranch(beginNode, deopt, graph);
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67 }
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68 }
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69 if (!deopt.isDeleted()) {
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70 visitDeoptBranch(findBeginNode(deopt), deopt, graph);
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71 }
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72 } else if (deoptBegin.predecessor() instanceof IfNode) {
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73 IfNode ifNode = (IfNode) deoptBegin.predecessor();
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74 BeginNode otherBegin = ifNode.trueSuccessor();
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75 BooleanNode conditionNode = ifNode.compare();
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76 if (deoptBegin == ifNode.trueSuccessor()) {
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77 conditionNode = conditionNode.negate();
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78 otherBegin = ifNode.falseSuccessor();
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79 }
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80 BeginNode ifBlockBegin = findBeginNode(ifNode);
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81 Debug.log("Converting %s on %-5s branch of %s to guard for remaining branch %s. IfBegin=%s", deopt, deoptBegin == ifNode.trueSuccessor() ? "true" : "false", ifNode, otherBegin, ifBlockBegin);
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82 FixedGuardNode guard = graph.add(new FixedGuardNode(conditionNode));
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83 otherBegin.replaceAtUsages(ifBlockBegin);
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84 FixedNode next = otherBegin.next();
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85 otherBegin.setNext(null);
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86 guard.setNext(next);
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87 ifNode.replaceAtPredecessors(guard);
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88 GraphUtil.killCFG(ifNode);
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89 }
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90 }
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91 }