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annotate graal/com.oracle.max.graal.compiler/src/com/oracle/max/graal/compiler/phases/LoweringPhase.java @ 2941:cd4176d590e7

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Towards lowering phase.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Thu, 09 Jun 2011 17:28:56 +0200
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children 3891afa020da
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2941
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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
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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.compiler.*;
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28 import com.oracle.max.graal.compiler.ir.*;
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29 import com.oracle.max.graal.compiler.schedule.*;
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30 import com.oracle.max.graal.graph.*;
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31
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32 public class LoweringPhase extends Phase {
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33 @Override
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34 protected void run(Graph graph) {
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35 NodeMap<Node> javaBlockNodes = graph.createNodeMap();
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36 NodeBitMap nodeBitMap = graph.createNodeBitMap();
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37 for (Node n : graph.getNodes()) {
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38 if (n instanceof FixedNode) {
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39 LoweringOp op = n.lookup(LoweringOp.class);
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40 if (op != null) {
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41 Node javaBlockNode = getJavaBlockNode(javaBlockNodes, n, nodeBitMap);
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42 }
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43 }
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44
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45 }
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46 }
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47
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48 private Node getJavaBlockNode(NodeMap<Node> javaBlockNodes, Node n, NodeBitMap nodeBitMap) {
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49 assert n instanceof FixedNode;
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50 if (javaBlockNodes.get(n) == null) {
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51
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52 Node truePred = null;
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53 int count = 0;
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54 for (Node pred : n.predecessors()) {
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55 if (pred instanceof FixedNode) {
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56 truePred = pred;
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57 count++;
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58 }
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59 }
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60
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61 assert count > 0;
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62 if (count == 1) {
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63 if (Schedule.trueSuccessorCount(truePred) == 1) {
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64 javaBlockNodes.set(n, getJavaBlockNode(javaBlockNodes, truePred, nodeBitMap));
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65 } else {
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66 // Single predecessor is a split => we are our own block node.
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67 javaBlockNodes.set(n, n);
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68 }
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69 } else {
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70 Node dominator = null;
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71 for (Node pred : n.predecessors()) {
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72 if (pred instanceof FixedNode) {
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73 dominator = getCommonDominator(dominator, pred, nodeBitMap);
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74 }
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75 }
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76 }
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77 }
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78
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79 assert Schedule.truePredecessorCount(javaBlockNodes.get(n)) == 1;
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80 return javaBlockNodes.get(n);
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81 }
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82
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83 private Node getCommonDominator(Node a, Node b, NodeBitMap map) {
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84 if (a == null) {
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85 return b;
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86 }
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87
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88 if (b == null) {
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89 return a;
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90 }
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91
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92
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93 map.clearAll();
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94 }
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95
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96 public interface LoweringOp extends Op {
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97 Node lower(Node node);
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98 }
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99 }