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1 /*
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Gilles Duboscq <gilles.duboscq@oracle.com>
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2 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
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Gilles Duboscq <gilles.duboscq@oracle.com>
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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Gilles Duboscq <gilles.duboscq@oracle.com>
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4 *
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Gilles Duboscq <gilles.duboscq@oracle.com>
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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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Gilles Duboscq <gilles.duboscq@oracle.com>
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7 * published by the Free Software Foundation.
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Gilles Duboscq <gilles.duboscq@oracle.com>
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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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Gilles Duboscq <gilles.duboscq@oracle.com>
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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Gilles Duboscq <gilles.duboscq@oracle.com>
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12 * version 2 for more details (a copy is included in the LICENSE file that
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Gilles Duboscq <gilles.duboscq@oracle.com>
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13 * accompanied this code).
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Gilles Duboscq <gilles.duboscq@oracle.com>
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14 *
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Gilles Duboscq <gilles.duboscq@oracle.com>
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15 * You should have received a copy of the GNU General Public License version
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Gilles Duboscq <gilles.duboscq@oracle.com>
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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Gilles Duboscq <gilles.duboscq@oracle.com>
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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Gilles Duboscq <gilles.duboscq@oracle.com>
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18 *
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Gilles Duboscq <gilles.duboscq@oracle.com>
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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Gilles Duboscq <gilles.duboscq@oracle.com>
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20 * or visit www.oracle.com if you need additional information or have any
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Gilles Duboscq <gilles.duboscq@oracle.com>
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21 * questions.
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Gilles Duboscq <gilles.duboscq@oracle.com>
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22 */
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Gilles Duboscq <gilles.duboscq@oracle.com>
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23 package com.sun.c1x.ir;
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24
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25 import com.oracle.graal.graph.*;
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26 import com.sun.c1x.debug.*;
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27 import com.sun.c1x.util.*;
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28 import com.sun.c1x.value.*;
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29 import com.sun.cri.ci.*;
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30
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31 /**
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Gilles Duboscq <gilles.duboscq@oracle.com>
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32 * Denotes the beginning of a basic block, and holds information
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33 * about the basic block, including the successor and
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34 * predecessor blocks, exception handlers, liveness information, etc.
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Gilles Duboscq <gilles.duboscq@oracle.com>
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35 */
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36 public final class Merge extends StateSplit {
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37
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38 private static final int INPUT_COUNT = 0;
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39
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40 private static final int SUCCESSOR_COUNT = 0;
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41
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42 @Override
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43 protected int inputCount() {
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44 return super.inputCount() + INPUT_COUNT;
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45 }
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46
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47 @Override
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48 protected int successorCount() {
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49 return super.successorCount() + SUCCESSOR_COUNT;
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50 }
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51
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52 @Override
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53 public boolean needsStateAfter() {
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54 return false;
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55 }
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56
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57 public final boolean isLoopHeader;
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58
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59 /**
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60 * Index of bytecode that generated this node when appended in a basic block.
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61 * Negative values indicate special cases.
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62 */
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63 private int bci;
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64
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65 /**
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66 * Constructs a new Merge at the specified bytecode index.
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67 * @param bci the bytecode index of the start
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68 * @param blockID the ID of the block
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69 * @param graph
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70 */
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71 public Merge(int bci, boolean isLoopHeader, Graph graph) {
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72 super(CiKind.Illegal, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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73 this.bci = bci;
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74 this.isLoopHeader = isLoopHeader;
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75 }
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76
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77 /**
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78 * Gets the bytecode index of this instruction.
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79 * @return the bytecode index of this instruction
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80 */
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81 public int bci() {
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82 return bci;
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83 }
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84
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85 @Override
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86 public void accept(ValueVisitor v) {
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87 v.visitMerge(this);
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88 }
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89
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90 @Override
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91 public String toString() {
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92 StringBuilder builder = new StringBuilder();
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93 builder.append("merge #");
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94 builder.append(id());
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95 builder.append(" [");
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96
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97 builder.append("]");
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98
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99 builder.append(" -> ");
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100 boolean hasSucc = false;
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101 for (Node s : this.successors()) {
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102 if (hasSucc) {
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103 builder.append(", ");
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104 }
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105 builder.append("#");
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106 if (s != null) {
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107 builder.append(s.id());
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108 } else {
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109 builder.append("null");
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110 }
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111 hasSucc = true;
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112 }
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113
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114 return builder.toString();
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115 }
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116
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117 public void printWithoutPhis(LogStream out) {
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118 // print block id
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119 out.print("B").print(id()).print(" ");
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120
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121 // print flags
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122 StringBuilder sb = new StringBuilder(8);
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123 if (sb.length() != 0) {
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124 out.print('(').print(sb.toString()).print(')');
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125 }
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126
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127 // print block bci range
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128 out.print('[').print(-1).print(", ").print(-1).print(']');
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129
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130 // print block successors
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131 //if (end != null && end.blockSuccessors().size() > 0) {
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132 out.print(" .");
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133 for (Node successor : this.successors()) {
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134 if (successor instanceof Value) {
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135 out.print((Value) successor);
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136 } else {
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137 out.print(successor.toString());
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138 }
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139 }
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140 //}
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141
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142 // print predecessors
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143 if (!blockPredecessors().isEmpty()) {
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144 out.print(" pred:");
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145 for (Instruction pred : blockPredecessors()) {
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146 out.print(pred.block());
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147 }
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148 }
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149 }
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150
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151 @Override
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152 public void print(LogStream out) {
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153
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154 printWithoutPhis(out);
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155
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156 // print phi functions
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157 boolean hasPhisInLocals = false;
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158 boolean hasPhisOnStack = false;
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159
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160 //if (end() != null && end().stateAfter() != null) {
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161 FrameState state = stateBefore();
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162
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163 int i = 0;
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164 while (!hasPhisOnStack && i < state.stackSize()) {
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165 Value value = state.stackAt(i);
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166 hasPhisOnStack = isPhiAtBlock(value);
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167 if (value != null && !value.isIllegal()) {
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168 i += value.kind.sizeInSlots();
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169 } else {
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170 i++;
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Gilles Duboscq <gilles.duboscq@oracle.com>
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171 }
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Gilles Duboscq <gilles.duboscq@oracle.com>
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172 }
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173
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174 for (i = 0; !hasPhisInLocals && i < state.localsSize();) {
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175 Value value = state.localAt(i);
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176 hasPhisInLocals = isPhiAtBlock(value);
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177 // also ignore illegal HiWords
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178 if (value != null && !value.isIllegal()) {
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179 i += value.kind.sizeInSlots();
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180 } else {
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181 i++;
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182 }
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183 }
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Gilles Duboscq <gilles.duboscq@oracle.com>
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184 //}
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185
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Gilles Duboscq <gilles.duboscq@oracle.com>
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186 // print values in locals
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Gilles Duboscq <gilles.duboscq@oracle.com>
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187 if (hasPhisInLocals) {
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Gilles Duboscq <gilles.duboscq@oracle.com>
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188 out.println();
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Gilles Duboscq <gilles.duboscq@oracle.com>
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189 out.println("Locals:");
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Gilles Duboscq <gilles.duboscq@oracle.com>
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190
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Gilles Duboscq <gilles.duboscq@oracle.com>
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191 int j = 0;
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Gilles Duboscq <gilles.duboscq@oracle.com>
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192 while (j < state.localsSize()) {
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Gilles Duboscq <gilles.duboscq@oracle.com>
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193 Value value = state.localAt(j);
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Gilles Duboscq <gilles.duboscq@oracle.com>
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194 if (value != null) {
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Gilles Duboscq <gilles.duboscq@oracle.com>
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195 out.println(stateString(j, value));
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Gilles Duboscq <gilles.duboscq@oracle.com>
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196 // also ignore illegal HiWords
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Gilles Duboscq <gilles.duboscq@oracle.com>
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197 j += value.isIllegal() ? 1 : value.kind.sizeInSlots();
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Gilles Duboscq <gilles.duboscq@oracle.com>
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198 } else {
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Gilles Duboscq <gilles.duboscq@oracle.com>
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199 j++;
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Gilles Duboscq <gilles.duboscq@oracle.com>
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200 }
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Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
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201 }
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Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
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202 out.println();
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Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
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203 }
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Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
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204
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Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
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205 // print values on stack
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Gilles Duboscq <gilles.duboscq@oracle.com>
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206 if (hasPhisOnStack) {
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Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
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207 out.println();
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Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
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208 out.println("Stack:");
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Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
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209 int j = 0;
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Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
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210 while (j < stateBefore().stackSize()) {
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Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
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211 Value value = stateBefore().stackAt(j);
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Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
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212 if (value != null) {
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Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
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213 out.println(stateString(j, value));
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Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
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214 j += value.kind.sizeInSlots();
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Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
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215 } else {
|
Gilles Duboscq <gilles.duboscq@oracle.com>
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216 j++;
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
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217 }
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
218 }
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
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219 }
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
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220
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
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221 }
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
222
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
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|
223 /**
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
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|
224 * Determines if a given instruction is a phi whose {@linkplain Phi#block() join block} is a given block.
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
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|
225 *
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
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|
226 * @param value the instruction to test
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
227 * @param block the block that may be the join block of {@code value} if {@code value} is a phi
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
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|
228 * @return {@code true} if {@code value} is a phi and its join block is {@code block}
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
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|
229 */
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
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230 private boolean isPhiAtBlock(Value value) {
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
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|
231 return value instanceof Phi && ((Phi) value).block() == this;
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
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|
232 }
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
233
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
234
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
235 /**
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
236 * Formats a given instruction as a value in a {@linkplain FrameState frame state}. If the instruction is a phi defined at a given
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
237 * block, its {@linkplain Phi#valueCount() inputs} are appended to the returned string.
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
238 *
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
239 * @param index the index of the value in the frame state
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
240 * @param value the frame state value
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
241 * @param block if {@code value} is a phi, then its inputs are formatted if {@code block} is its
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
242 * {@linkplain Phi#block() join point}
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
243 * @return the instruction representation as a string
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
244 */
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
245 public String stateString(int index, Value value) {
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
246 StringBuilder sb = new StringBuilder(30);
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
247 sb.append(String.format("%2d %s", index, Util.valueString(value)));
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
248 if (value instanceof Phi) {
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
249 Phi phi = (Phi) value;
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
250 // print phi operands
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
251 if (phi.block() == this) {
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
252 sb.append(" [");
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
253 for (int j = 0; j < phi.valueCount(); j++) {
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
254 sb.append(' ');
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
255 Value operand = phi.valueAt(j);
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
256 if (operand != null) {
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
257 sb.append(Util.valueString(operand));
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
258 } else {
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
259 sb.append("NULL");
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
260 }
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
261 }
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
262 sb.append("] ");
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
263 }
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
264 }
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
265 return sb.toString();
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
266 }
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
267
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
268 @Override
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
269 public String shortName() {
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
270 return "Merge #" + id();
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
271 }
|
Gilles Duboscq <gilles.duboscq@oracle.com>
parents:
diff
changeset
|
272 }
|