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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.oops;
  26 
  27 import java.io.*;
  28 import java.util.*;
  29 import sun.jvm.hotspot.debugger.*;
  30 import sun.jvm.hotspot.runtime.*;
  31 import sun.jvm.hotspot.types.*;
  32 import 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.
  41 public 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 }