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3939
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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 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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4 *
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5 *
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6 *
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7 *
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8 *
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9 *
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10 *
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11 *
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12 *
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13 *
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14 *
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15 *
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16 *
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17 *
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18 *
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19 *
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20 *
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21 *
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.oops;
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26
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27 import java.io.*;
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28 import java.util.*;
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29 import sun.jvm.hotspot.debugger.*;
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30 import sun.jvm.hotspot.runtime.*;
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31 import sun.jvm.hotspot.types.*;
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32 import sun.jvm.hotspot.utilities.*;
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33
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34 // ReceiverTypeData
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35 //
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36 // A ReceiverTypeData is used to access profiling information about a
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37 // dynamic type check. It consists of a counter which counts the total times
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38 // that the check is reached, and a series of (Klass, count) pairs
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39 // which are used to store a type profile for the receiver of the check.
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40 public class ReceiverTypeData extends CounterData {
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41 static final int receiver0Offset = counterCellCount;
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42 static final int count0Offset = receiver0Offset + 1;
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43 static final int receiverTypeRowCellCount = (count0Offset + 1) - receiver0Offset;
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44
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45 public ReceiverTypeData(DataLayout layout) {
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46 super(layout);
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47 //assert(layout.tag() == DataLayout.receiverTypeDataTag ||
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48 // layout.tag() == DataLayout.virtualCallDataTag, "wrong type");
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49 }
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50
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51 boolean isReceivertypedata() { return true; }
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52
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53 static int staticCellCount() {
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54 return counterCellCount + MethodData.TypeProfileWidth * receiverTypeRowCellCount;
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55 }
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56
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57 public int cellCount() {
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58 return staticCellCount();
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59 }
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60
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61 // Direct accessors
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62 public static int rowLimit() {
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63 return MethodData.TypeProfileWidth;
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64 }
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65 public static int receiverCellIndex(int row) {
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66 return receiver0Offset + row * receiverTypeRowCellCount;
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67 }
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68 public static int receiverCountCellIndex(int row) {
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69 return count0Offset + row * receiverTypeRowCellCount;
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70 }
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71
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72 // Get the receiver at row. The 'unchecked' version is needed by parallel old
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73 // gc; it does not assert the receiver is a klass. During compaction of the
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74 // perm gen, the klass may already have moved, so the isKlass() predicate
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75 // would fail. The 'normal' version should be used whenever possible.
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76 Klass receiverUnchecked(int row) {
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77 //assert(row < rowLimit(), "oob");
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78 Oop recv = oopAt(receiverCellIndex(row));
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79 return (Klass)recv;
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80 }
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81
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82 public Klass receiver(int row) {
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83 Klass recv = receiverUnchecked(row);
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84 //assert(recv == NULL || ((oop)recv).isKlass(), "wrong type");
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85 return recv;
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86 }
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87
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88 public int receiverCount(int row) {
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89 //assert(row < rowLimit(), "oob");
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90 return uintAt(receiverCountCellIndex(row));
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91 }
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92
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93 // Code generation support
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94 static int receiverOffset(int row) {
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95 return cellOffset(receiverCellIndex(row));
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96 }
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97 static int receiverCountOffset(int row) {
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98 return cellOffset(receiverCountCellIndex(row));
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99 }
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100 static int receiverTypeDataSize() {
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101 return cellOffset(staticCellCount());
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102 }
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103
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104 void printReceiverDataOn(PrintStream st) {
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105 int row;
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106 int entries = 0;
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107 for (row = 0; row < rowLimit(); row++) {
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108 if (receiver(row) != null) entries++;
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109 }
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110 st.println("count(" + count() + ") entries(" + entries + ")");
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111 for (row = 0; row < rowLimit(); row++) {
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112 if (receiver(row) != null) {
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113 tab(st);
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114 receiver(row).printValueOn(st);
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115 st.println("(" + receiverCount(row) + ")");
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116 }
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117 }
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118 }
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119 public void printDataOn(PrintStream st) {
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120 printShared(st, "ReceiverTypeData");
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121 printReceiverDataOn(st);
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122 }
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123 }
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