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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 // MultiBranchData
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35 //
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36 // A MultiBranchData is used to access profiling information for
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37 // a multi-way branch (*switch bytecodes). It consists of a series
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38 // of (count, displacement) pairs, which count the number of times each
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39 // case was taken and specify the data displacment for each branch target.
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40 public class MultiBranchData extends ArrayData {
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41 static final int defaultCountOffSet = 0;
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42 static final int defaultDisaplacementOffSet = 1;
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43 static final int caseArrayStart = 2;
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44 static final int relativeCountOffSet = 0;
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45 static final int relativeDisplacementOffSet = 1;
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46 static final int perCaseCellCount = 2;
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47
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48 public MultiBranchData(DataLayout layout) {
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49 super(layout);
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50 //assert(layout.tag() == DataLayout.multiBranchDataTag, "wrong type");
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51 }
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52
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53 // static int computeCellCount(BytecodeStream stream);
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54
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55 int numberOfCases() {
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56 int alen = arrayLen() - 2; // get rid of default case here.
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57 //assert(alen % perCaseCellCount == 0, "must be even");
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58 return (alen / perCaseCellCount);
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59 }
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60
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61 int defaultCount() {
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62 return arrayUintAt(defaultCountOffSet);
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63 }
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64 int defaultDisplacement() {
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65 return arrayIntAt(defaultDisaplacementOffSet);
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66 }
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67
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68 int countAt(int index) {
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69 return arrayUintAt(caseArrayStart +
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70 index * perCaseCellCount +
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71 relativeCountOffSet);
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72 }
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73 int displacementAt(int index) {
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74 return arrayIntAt(caseArrayStart +
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75 index * perCaseCellCount +
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76 relativeDisplacementOffSet);
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77 }
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78
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79 // Code generation support
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80 static int defaultCountOffset() {
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81 return arrayElementOffset(defaultCountOffSet);
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82 }
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83 static int defaultDisplacementOffset() {
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84 return arrayElementOffset(defaultDisaplacementOffSet);
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85 }
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86 static int caseCountOffset(int index) {
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87 return caseArrayOffset() +
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88 (perCaseSize() * index) +
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89 relativeCountOffset();
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90 }
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91 static int caseArrayOffset() {
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92 return arrayElementOffset(caseArrayStart);
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93 }
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94 static int perCaseSize() {
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95 return (perCaseCellCount) * MethodData.cellSize;
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96 }
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97 static int relativeCountOffset() {
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98 return (relativeCountOffSet) * MethodData.cellSize;
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99 }
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100 static int relativeDisplacementOffset() {
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101 return (relativeDisplacementOffSet) * MethodData.cellSize;
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102 }
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103
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104 public void printDataOn(PrintStream st) {
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105 printShared(st, "MultiBranchData");
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106 st.println("default_count(" + defaultCount() + ") displacement(" + defaultDisplacement() + ")");
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107 int cases = numberOfCases();
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108 for (int i = 0; i < cases; i++) {
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109 tab(st);
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110 st.println("count(" + countAt(i) + ") displacement(" + displacementAt(i) + ")");
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111 }
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112 }
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113 }
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