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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 // JumpData
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35 //
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36 // A JumpData is used to access profiling information for a direct
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37 // branch. It is a counter, used for counting the number of branches,
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38 // plus a data displacement, used for realigning the data pointer to
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39 // the corresponding target bci.
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40 public class JumpData extends ProfileData {
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41 static final int takenOffSet = 0;
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42 static final int displacementOffSet = 1;
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43 static final int jumpCellCount = 2;
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44
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45 public JumpData(DataLayout layout) {
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46 super(layout);
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47 //assert(layout.tag() == DataLayout.jumpDataTag ||
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48 // layout.tag() == DataLayout.branchDataTag, "wrong type");
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49 }
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50
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51 static int staticCellCount() {
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52 return jumpCellCount;
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53 }
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54
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55 public int cellCount() {
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56 return staticCellCount();
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57 }
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58
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59 // Direct accessor
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60 int taken() {
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61 return uintAt(takenOffSet);
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62 }
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63
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64 int displacement() {
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65 return intAt(displacementOffSet);
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66 }
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67
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68 // Code generation support
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69 static int takenOffset() {
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70 return cellOffset(takenOffSet);
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71 }
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72
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73 static int displacementOffset() {
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74 return cellOffset(displacementOffSet);
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75 }
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76
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77 public void printDataOn(PrintStream st) {
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78 printShared(st, "JumpData");
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79 st.println("taken(" + taken() + ") displacement(" + displacement() + ")");
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80 }
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81 }
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