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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/util/GraphUtil.java @ 15002:06e50d290784

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isAllowedUsageType on Nodes
author Lukas Stadler <lukas.stadler@oracle.com>
date Mon, 07 Apr 2014 11:32:08 +0200
parents 2eb56f87b01e
children e49f62425090
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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.graal.nodes.util;
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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.api.meta.*;
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28 import com.oracle.graal.graph.*;
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29 import com.oracle.graal.graph.iterators.*;
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30 import com.oracle.graal.nodes.*;
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31 import com.oracle.graal.nodes.calc.*;
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32 import com.oracle.graal.nodes.java.*;
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33 import com.oracle.graal.nodes.spi.*;
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34
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35 public class GraphUtil {
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36
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37 private static final NodePredicate FLOATING = new NodePredicate() {
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38
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39 @Override
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40 public final boolean apply(Node n) {
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41 // isA(FloatingNode.class).or(VirtualState.class).or(CallTargetNode.class)
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42 return n instanceof FloatingNode || n instanceof VirtualState || n instanceof CallTargetNode;
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43 }
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44 };
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45
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46 public static void killCFG(Node node) {
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47 assert node.isAlive();
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48 if (node instanceof AbstractEndNode) {
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49 // We reached a control flow end.
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50 AbstractEndNode end = (AbstractEndNode) node;
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51 killEnd(end);
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52 } else {
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53 // Normal control flow node.
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54 /*
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55 * We do not take a successor snapshot because this iterator supports concurrent
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56 * modifications as long as they do not change the size of the successor list. Not
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57 * taking a snapshot allows us to see modifications to other branches that may happen
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58 * while processing one branch.
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59 */
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60 for (Node successor : node.successors()) {
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61 killCFG(successor);
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62 }
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63 }
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64 propagateKill(node);
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65 }
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66
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67 private static void killEnd(AbstractEndNode end) {
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68 MergeNode merge = end.merge();
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69 if (merge != null) {
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70 merge.removeEnd(end);
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71 StructuredGraph graph = end.graph();
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72 if (merge instanceof LoopBeginNode && merge.forwardEndCount() == 0) { // dead loop
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73 for (PhiNode phi : merge.phis().snapshot()) {
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74 propagateKill(phi);
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75 }
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76 LoopBeginNode begin = (LoopBeginNode) merge;
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77 // disconnect and delete loop ends & loop exits
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78 for (LoopEndNode loopend : begin.loopEnds().snapshot()) {
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79 loopend.predecessor().replaceFirstSuccessor(loopend, null);
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80 loopend.safeDelete();
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81 }
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82 begin.removeExits();
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83 FixedNode loopBody = begin.next();
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84 if (loopBody != null) { // for small infinite loops, the body may be killed while
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85 // killing the loop ends
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86 killCFG(loopBody);
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87 }
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88 begin.safeDelete();
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89 } else if (merge instanceof LoopBeginNode && ((LoopBeginNode) merge).loopEnds().isEmpty()) { // not
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90 // a
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91 // loop
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92 // anymore
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93 graph.reduceDegenerateLoopBegin((LoopBeginNode) merge);
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94 } else if (merge.phiPredecessorCount() == 1) { // not a merge anymore
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95 graph.reduceTrivialMerge(merge);
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96 }
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97 }
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98 }
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99
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100 public static NodePredicate isFloatingNode() {
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101 return FLOATING;
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102 }
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103
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104 public static void propagateKill(Node node) {
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105 if (node != null && node.isAlive()) {
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106 List<Node> usagesSnapshot = node.usages().filter(isFloatingNode()).snapshot();
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107
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108 // null out remaining usages
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109 node.replaceAtUsages(null);
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110 node.replaceAtPredecessor(null);
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111 killWithUnusedFloatingInputs(node);
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112
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113 for (Node usage : usagesSnapshot) {
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114 if (!usage.isDeleted()) {
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115 if (usage instanceof PhiNode) {
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116 usage.replaceFirstInput(node, null);
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117 } else {
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118 propagateKill(usage);
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119 }
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120 }
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121 }
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122 }
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123 }
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124
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125 public static void killWithUnusedFloatingInputs(Node node) {
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126 if (node.recordsUsages()) {
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127 List<Node> floatingInputs = node.inputs().filter(isFloatingNode()).snapshot();
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128 node.safeDelete();
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129
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diff changeset
130 for (Node in : floatingInputs) {
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131 if (in.isAlive() && (!in.recordsUsages() || in.usages().isEmpty())) {
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132 killWithUnusedFloatingInputs(in);
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diff changeset
133 }
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a09b44a28e7f clenup unused floating nodes on killCFG
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diff changeset
134 }
12570
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diff changeset
135 } else {
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diff changeset
136 assert node.inputs().isEmpty();
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137 }
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138 }
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139
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diff changeset
140 public static void removeFixedWithUnusedInputs(FixedWithNextNode fixed) {
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diff changeset
141 FixedNode next = fixed.next();
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diff changeset
142 fixed.setNext(null);
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diff changeset
143 fixed.replaceAtPredecessor(next);
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144 killWithUnusedFloatingInputs(fixed);
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145 }
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146
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diff changeset
147 public static void checkRedundantPhi(PhiNode phiNode) {
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148 if (phiNode.isDeleted() || phiNode.valueCount() == 1) {
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149 return;
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150 }
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151
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diff changeset
152 ValueNode singleValue = phiNode.singleValue();
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153 if (singleValue != null) {
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154 Collection<PhiNode> phiUsages = phiNode.usages().filter(PhiNode.class).snapshot();
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diff changeset
155 Collection<ProxyNode> proxyUsages = phiNode.usages().filter(ProxyNode.class).snapshot();
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19c5a07c7843 Introduce a graph() method that returns a StructuredGraph, to make many explicit casts unnecessary
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diff changeset
156 phiNode.graph().replaceFloating(phiNode, singleValue);
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157 for (PhiNode phi : phiUsages) {
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158 checkRedundantPhi(phi);
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159 }
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diff changeset
160 for (ProxyNode proxy : proxyUsages) {
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161 checkRedundantProxy(proxy);
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162 }
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163 }
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164 }
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165
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diff changeset
166 public static void checkRedundantProxy(ProxyNode vpn) {
9436
ae815a4c112a Rename BeginNode => AbstractBeginNode and make abstract. Introduce concrete subclass BeginNode.
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diff changeset
167 AbstractBeginNode proxyPoint = vpn.proxyPoint();
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168 if (proxyPoint instanceof LoopExitNode) {
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diff changeset
169 LoopExitNode exit = (LoopExitNode) proxyPoint;
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diff changeset
170 LoopBeginNode loopBegin = exit.loopBegin();
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diff changeset
171 ValueNode vpnValue = vpn.value();
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diff changeset
172 for (ValueNode v : loopBegin.stateAfter().values()) {
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diff changeset
173 ValueNode v2 = v;
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diff changeset
174 if (loopBegin.isPhiAtMerge(v2)) {
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diff changeset
175 v2 = ((PhiNode) v2).valueAt(loopBegin.forwardEnd());
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diff changeset
176 }
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diff changeset
177 if (vpnValue == v2) {
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diff changeset
178 Collection<PhiNode> phiUsages = vpn.usages().filter(PhiNode.class).snapshot();
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diff changeset
179 Collection<ProxyNode> proxyUsages = vpn.usages().filter(ProxyNode.class).snapshot();
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diff changeset
180 vpn.graph().replaceFloating(vpn, vpnValue);
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diff changeset
181 for (PhiNode phi : phiUsages) {
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diff changeset
182 checkRedundantPhi(phi);
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diff changeset
183 }
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184 for (ProxyNode proxy : proxyUsages) {
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diff changeset
185 checkRedundantProxy(proxy);
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diff changeset
186 }
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diff changeset
187 return;
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188 }
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189 }
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diff changeset
190 }
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diff changeset
191 }
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diff changeset
192
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diff changeset
193 public static void normalizeLoopBegin(LoopBeginNode begin) {
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diff changeset
194 // Delete unnecessary loop phi functions, i.e., phi functions where all inputs are either
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diff changeset
195 // the same or the phi itself.
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diff changeset
196 for (PhiNode phi : begin.phis().snapshot()) {
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diff changeset
197 GraphUtil.checkRedundantPhi(phi);
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diff changeset
198 }
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diff changeset
199 for (LoopExitNode exit : begin.loopExits()) {
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diff changeset
200 for (ProxyNode vpn : exit.proxies().snapshot()) {
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diff changeset
201 GraphUtil.checkRedundantProxy(vpn);
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diff changeset
202 }
e3e7542d78b7 Loop-closed form GraphBuidling
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parents: 5203
diff changeset
203 }
e3e7542d78b7 Loop-closed form GraphBuidling
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 5203
diff changeset
204 }
e3e7542d78b7 Loop-closed form GraphBuidling
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diff changeset
205
5563
6a2671066204 added NewInstanceSnippets for lowering NewInstanceNodes (currently disabled by default)
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diff changeset
206 /**
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diff changeset
207 * Gets an approximate source code location for a node if possible.
15002
06e50d290784 isAllowedUsageType on Nodes
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diff changeset
208 *
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diff changeset
209 * @return the StackTraceElements if an approximate source location is found, null otherwise
5563
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diff changeset
210 */
7310
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diff changeset
211 public static StackTraceElement[] approxSourceStackTraceElement(Node node) {
79a7b761755c Added getLineNumberTable and getFileName capabilities.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
212 ArrayList<StackTraceElement> elements = new ArrayList<>();
5563
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diff changeset
213 Node n = node;
6a2671066204 added NewInstanceSnippets for lowering NewInstanceNodes (currently disabled by default)
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diff changeset
214 while (n != null) {
6a2671066204 added NewInstanceSnippets for lowering NewInstanceNodes (currently disabled by default)
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diff changeset
215 if (n instanceof MethodCallTargetNode) {
7310
79a7b761755c Added getLineNumberTable and getFileName capabilities.
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diff changeset
216 elements.add(((MethodCallTargetNode) n).targetMethod().asStackTraceElement(-1));
9089
5ab06146e985 Rename "node()" methods in interfaces to "asNode"
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diff changeset
217 n = ((MethodCallTargetNode) n).invoke().asNode();
5563
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diff changeset
218 }
6a2671066204 added NewInstanceSnippets for lowering NewInstanceNodes (currently disabled by default)
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diff changeset
219
6a2671066204 added NewInstanceSnippets for lowering NewInstanceNodes (currently disabled by default)
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diff changeset
220 if (n instanceof StateSplit) {
7310
79a7b761755c Added getLineNumberTable and getFileName capabilities.
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diff changeset
221 FrameState state = ((StateSplit) n).stateAfter();
79a7b761755c Added getLineNumberTable and getFileName capabilities.
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diff changeset
222 while (state != null) {
79a7b761755c Added getLineNumberTable and getFileName capabilities.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 7245
diff changeset
223 ResolvedJavaMethod method = state.method();
5563
6a2671066204 added NewInstanceSnippets for lowering NewInstanceNodes (currently disabled by default)
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diff changeset
224 if (method != null) {
7310
79a7b761755c Added getLineNumberTable and getFileName capabilities.
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diff changeset
225 elements.add(method.asStackTraceElement(state.bci - 1));
5563
6a2671066204 added NewInstanceSnippets for lowering NewInstanceNodes (currently disabled by default)
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diff changeset
226 }
7310
79a7b761755c Added getLineNumberTable and getFileName capabilities.
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diff changeset
227 state = state.outerFrameState();
5563
6a2671066204 added NewInstanceSnippets for lowering NewInstanceNodes (currently disabled by default)
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diff changeset
228 }
7310
79a7b761755c Added getLineNumberTable and getFileName capabilities.
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diff changeset
229 break;
5563
6a2671066204 added NewInstanceSnippets for lowering NewInstanceNodes (currently disabled by default)
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diff changeset
230 }
6a2671066204 added NewInstanceSnippets for lowering NewInstanceNodes (currently disabled by default)
Doug Simon <doug.simon@oracle.com>
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diff changeset
231 n = n.predecessor();
6a2671066204 added NewInstanceSnippets for lowering NewInstanceNodes (currently disabled by default)
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diff changeset
232 }
7310
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diff changeset
233 return elements.toArray(new StackTraceElement[elements.size()]);
79a7b761755c Added getLineNumberTable and getFileName capabilities.
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diff changeset
234 }
79a7b761755c Added getLineNumberTable and getFileName capabilities.
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diff changeset
235
79a7b761755c Added getLineNumberTable and getFileName capabilities.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
236 /**
79a7b761755c Added getLineNumberTable and getFileName capabilities.
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diff changeset
237 * Gets an approximate source code location for a node, encoded as an exception, if possible.
15002
06e50d290784 isAllowedUsageType on Nodes
Lukas Stadler <lukas.stadler@oracle.com>
parents: 13794
diff changeset
238 *
7310
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diff changeset
239 * @return the exception with the location
79a7b761755c Added getLineNumberTable and getFileName capabilities.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
240 */
79a7b761755c Added getLineNumberTable and getFileName capabilities.
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diff changeset
241 public static RuntimeException approxSourceException(Node node, Throwable cause) {
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diff changeset
242 final StackTraceElement[] elements = approxSourceStackTraceElement(node);
79a7b761755c Added getLineNumberTable and getFileName capabilities.
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diff changeset
243 @SuppressWarnings("serial")
9389
708aea0e5a25 Introduce proxy nodes for propagating profiling information.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9089
diff changeset
244 RuntimeException exception = new RuntimeException((cause == null) ? null : cause.getMessage(), cause) {
7310
79a7b761755c Added getLineNumberTable and getFileName capabilities.
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diff changeset
245
79a7b761755c Added getLineNumberTable and getFileName capabilities.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
246 @Override
7731
8b7996916df6 Make fillInStackTrace final and non-synchronized in exceptions that do not need stack trace.
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diff changeset
247 public final synchronized Throwable fillInStackTrace() {
7310
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diff changeset
248 setStackTrace(elements);
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diff changeset
249 return this;
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diff changeset
250 }
79a7b761755c Added getLineNumberTable and getFileName capabilities.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 7245
diff changeset
251 };
79a7b761755c Added getLineNumberTable and getFileName capabilities.
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diff changeset
252 return exception;
79a7b761755c Added getLineNumberTable and getFileName capabilities.
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diff changeset
253 }
79a7b761755c Added getLineNumberTable and getFileName capabilities.
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diff changeset
254
79a7b761755c Added getLineNumberTable and getFileName capabilities.
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diff changeset
255 /**
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diff changeset
256 * Gets an approximate source code location for a node if possible.
15002
06e50d290784 isAllowedUsageType on Nodes
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parents: 13794
diff changeset
257 *
7530
5e3d1a68664e applied mx eclipseformat to all Java files
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258 * @return a file name and source line number in stack trace format (e.g. "String.java:32") if
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259 * an approximate source location is found, null otherwise
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260 */
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261 public static String approxSourceLocation(Node node) {
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262 StackTraceElement[] stackTraceElements = approxSourceStackTraceElement(node);
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263 if (stackTraceElements != null && stackTraceElements.length > 0) {
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264 StackTraceElement top = stackTraceElements[0];
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265 if (top.getFileName() != null && top.getLineNumber() >= 0) {
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266 return top.getFileName() + ":" + top.getLineNumber();
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267 }
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268 }
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269 return null;
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270 }
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271
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272 /**
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273 * Returns a string representation of the given collection of objects.
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274 *
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275 * @param objects The {@link Iterable} that will be used to iterate over the objects.
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276 * @return A string of the format "[a, b, ...]".
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277 */
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278 public static String toString(Iterable<?> objects) {
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279 StringBuilder str = new StringBuilder();
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280 str.append("[");
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281 for (Object o : objects) {
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282 str.append(o).append(", ");
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283 }
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284 if (str.length() > 1) {
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285 str.setLength(str.length() - 2);
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286 }
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287 str.append("]");
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288 return str.toString();
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289 }
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290
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291 /**
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292 * Gets the original value by iterating through all {@link ValueProxy ValueProxies}.
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293 *
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294 * @param value The start value.
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295 * @return The first non-proxy value encountered.
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296 */
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297 public static ValueNode unproxify(ValueNode value) {
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298 ValueNode result = value;
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299 while (result instanceof ValueProxy) {
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300 result = ((ValueProxy) result).getOriginalValue();
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301 }
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302 return result;
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303 }
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304
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305 /**
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306 * Tries to find an original value of the given node by traversing through proxies and
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307 * unambiguous phis. Note that this method will perform an exhaustive search through phis. It is
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308 * intended to be used during graph building, when phi nodes aren't yet canonicalized.
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309 *
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310 * @param proxy The node whose original value should be determined.
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311 */
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312 public static ValueNode originalValue(ValueNode proxy) {
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313 ValueNode v = proxy;
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314 do {
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315 if (v instanceof ValueProxy) {
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316 v = ((ValueProxy) v).getOriginalValue();
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317 } else if (v instanceof PhiNode) {
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318 v = ((PhiNode) v).singleValue();
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319 } else {
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320 break;
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321 }
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322 } while (v != null);
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323
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324 if (v == null) {
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325 v = new OriginalValueSearch(proxy).result;
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326 }
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327 return v;
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328 }
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329
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330 /**
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331 * Exhaustive search for {@link GraphUtil#originalValue(ValueNode)} when a simple search fails.
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332 * This can happen in the presence of complicated phi/proxy/phi constructs.
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333 */
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334 static class OriginalValueSearch {
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335 ValueNode result;
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336
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337 public OriginalValueSearch(ValueNode proxy) {
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338 NodeWorkList worklist = proxy.graph().createNodeWorkList();
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339 worklist.add(proxy);
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340 for (Node node : worklist) {
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341 if (node instanceof ValueProxy) {
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342 ValueNode originalValue = ((ValueProxy) node).getOriginalValue();
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343 if (!process(originalValue, worklist)) {
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344 return;
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345 }
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346 } else if (node instanceof PhiNode) {
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347 for (Node value : ((PhiNode) node).values()) {
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348 if (!process((ValueNode) value, worklist)) {
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349 return;
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350 }
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351 }
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352 } else {
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353 if (!process((ValueNode) node, null)) {
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354 return;
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355 }
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356 }
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357 }
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358 }
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359
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360 /**
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361 * Process a node as part of this search.
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362 *
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363 * @param node the next node encountered in the search
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364 * @param worklist if non-null, {@code node} will be added to this list. Otherwise,
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365 * {@code node} is treated as a candidate result.
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366 * @return true if the search should continue, false if a definitive {@link #result} has
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367 * been found
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368 */
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369 private boolean process(ValueNode node, NodeWorkList worklist) {
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370 if (node.isAlive()) {
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371 if (worklist == null) {
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372 if (result == null) {
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373 // Initial candidate result: continue search
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374 result = node;
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375 } else if (result != node) {
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376 // Conflicts with existing candidate: stop search with null result
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377 result = null;
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378 return false;
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379 }
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380 } else {
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381 worklist.add(node);
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382 }
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383 }
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384 return true;
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385 }
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386 }
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parents:
diff changeset
387 }