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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 // BranchData
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35 //
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36 // A BranchData is used to access profiling data for a two-way branch.
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37 // It consists of taken and notTaken counts as well as a data displacement
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38 // for the taken case.
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39 public class BranchData extends JumpData {
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40
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41 static final int notTakenOffSet = jumpCellCount;
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42 static final int branchCellCount = notTakenOffSet + 1;
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43
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44 public BranchData(DataLayout layout) {
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45 super(layout);
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46 //assert(layout.tag() == DataLayout.branchDataTag, "wrong type");
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47 }
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48
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49 static int staticCellCount() {
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50 return branchCellCount;
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51 }
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52
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53 public int cellCount() {
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54 return staticCellCount();
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55 }
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56
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57 // Direct accessor
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58 int notTaken() {
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59 return uintAt(notTakenOffSet);
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60 }
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61
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62 // Code generation support
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63 static int notTakenOffset() {
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64 return cellOffset(notTakenOffSet);
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65 }
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66 static int branchDataSize() {
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67 return cellOffset(branchCellCount);
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68 }
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69
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70 public void printDataOn(PrintStream st) {
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71 printShared(st, "BranchData");
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72 st.println("taken(" + taken() + ") displacement(" + displacement() + ")");
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73 tab(st);
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74 st.println("not taken(" + notTaken() + ")");
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75 }
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76 }
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