1/*
2 * Copyright (c) 2011, 2012, 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.
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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// BranchData
35//
36// A BranchData is used to access profiling data for a two-way branch.
37// It consists of taken and notTaken counts as well as a data displacement
38// for the taken case.
39public class BranchData extends JumpData {
40
41  static final int notTakenOffSet = jumpCellCount;
42  static final int branchCellCount = notTakenOffSet + 1;
43
44  public BranchData(DataLayout layout) {
45    super(layout);
46    //assert(layout.tag() == DataLayout.branchDataTag, "wrong type");
47  }
48
49  static int staticCellCount() {
50    return branchCellCount;
51  }
52
53  public int cellCount() {
54    return staticCellCount();
55  }
56
57  // Direct accessor
58  int notTaken() {
59    return uintAt(notTakenOffSet);
60  }
61
62  // Code generation support
63  static int notTakenOffset() {
64    return cellOffset(notTakenOffSet);
65  }
66  static int branchDataSize() {
67    return cellOffset(branchCellCount);
68  }
69
70  public void printDataOn(PrintStream st) {
71    printShared(st, "BranchData");
72    st.println("taken(" + taken() + ") displacement(" + displacement() + ")");
73    tab(st);
74    st.println("not taken(" + notTaken() + ")");
75  }
76}
77