RetData.java revision 9883:903a2e023ffb 
1/*
2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25package sun.jvm.hotspot.oops;
26
27import java.io.*;
28import java.util.*;
29import sun.jvm.hotspot.debugger.*;
30import sun.jvm.hotspot.runtime.*;
31import sun.jvm.hotspot.types.*;
32import sun.jvm.hotspot.utilities.*;
33
34// RetData
35//
36// A RetData is used to access profiling information for a ret bytecode.
37// It is composed of a count of the number of times that the ret has
38// been executed, followed by a series of triples of the form
39// (bci, count, di) which count the number of times that some bci was the
40// target of the ret and cache a corresponding data displacement.
41public class RetData extends CounterData {
42
43  static final int   bci0Offset = counterCellCount;
44  static final int     count0Offset = bci0Offset + 1;
45  static final int     displacement0Offset = count0Offset + 1;
46  static final int     retRowCellCount = (displacement0Offset + 1) - bci0Offset;
47
48  public RetData(DataLayout layout) {
49    super(layout);
50    //assert(layout.tag() == DataLayout.retDataTag, "wrong type");
51  }
52
53  static final int noBci = -1; // value of bci when bci1/2 are not in use.
54
55  static int staticCellCount() {
56    return counterCellCount + MethodData.BciProfileWidth * retRowCellCount;
57  }
58
59  public int cellCount() {
60    return staticCellCount();
61  }
62
63  static int rowLimit() {
64    return MethodData.BciProfileWidth;
65  }
66  static int bciCellIndex(int row) {
67    return bci0Offset + row * retRowCellCount;
68  }
69  static int bciCountCellIndex(int row) {
70    return count0Offset + row * retRowCellCount;
71  }
72  static int bciDisplacementCellIndex(int row) {
73    return displacement0Offset + row * retRowCellCount;
74  }
75
76  // Direct accessors
77  int bci(int row) {
78    return intAt(bciCellIndex(row));
79  }
80  int bciCount(int row) {
81    return uintAt(bciCountCellIndex(row));
82  }
83  int bciDisplacement(int row) {
84    return intAt(bciDisplacementCellIndex(row));
85  }
86
87  // Code generation support
88  static int bciOffset(int row) {
89    return cellOffset(bciCellIndex(row));
90  }
91  static int bciCountOffset(int row) {
92    return cellOffset(bciCountCellIndex(row));
93  }
94  static int bciDisplacementOffset(int row) {
95    return cellOffset(bciDisplacementCellIndex(row));
96  }
97
98  public void printDataOn(PrintStream st) {
99    printShared(st, "RetData");
100    int row;
101    int entries = 0;
102    for (row = 0; row < rowLimit(); row++) {
103      if (bci(row) != noBci)  entries++;
104    }
105    st.println("count(" + count() + ") entries(" + entries + ")");
106    for (row = 0; row < rowLimit(); row++) {
107      if (bci(row) != noBci) {
108        tab(st);
109        st.println(" bci(" + bci(row) + ": count(" + bciCount(row) + ") displacement(" + bciDisplacement(row) + "))");
110      }
111    }
112  }
113}
114