1 /*
   2  * Copyright (c) 1997, 2015, 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 
  25 #ifndef SHARE_VM_INTERPRETER_BYTECODEHISTOGRAM_HPP
  26 #define SHARE_VM_INTERPRETER_BYTECODEHISTOGRAM_HPP
  27 
  28 #include "interpreter/bytecodes.hpp"
  29 #include "memory/allocation.hpp"
  30 
  31 // BytecodeCounter counts the number of bytecodes executed
  32 
  33 class BytecodeCounter: AllStatic {
  34  private:
  35   NOT_PRODUCT(static int   _counter_value;)
  36   NOT_PRODUCT(static jlong _reset_time;)
  37 
  38   friend class TemplateInterpreterGenerator;
  39   friend class         BytecodeInterpreter;
  40 
  41  public:
  42   // Initialization
  43   static void reset()                      PRODUCT_RETURN;
  44 
  45   // Counter info (all info since last reset)
  46   static int    counter_value()            PRODUCT_RETURN0 NOT_PRODUCT({ return _counter_value; });
  47   static double elapsed_time()             PRODUCT_RETURN0; // in seconds
  48   static double frequency()                PRODUCT_RETURN0; // bytecodes/seconds
  49 
  50   // Counter printing
  51   static void   print()                    PRODUCT_RETURN;
  52 };
  53 
  54 
  55 // BytecodeHistogram collects number of executions of bytecodes
  56 
  57 class BytecodeHistogram: AllStatic {
  58  private:
  59   NOT_PRODUCT(static int _counters[Bytecodes::number_of_codes];)   // a counter for each bytecode
  60 
  61   friend class TemplateInterpreterGenerator;
  62   friend class         BytecodeInterpreter;
  63 
  64  public:
  65   // Initialization
  66   static void reset()                       PRODUCT_RETURN; // reset counters
  67 
  68   // Profile printing
  69   static void print(float cutoff = 0.01F)   PRODUCT_RETURN; // cutoff in percent
  70 };
  71 
  72 
  73 // BytecodePairHistogram collects number of executions of bytecode pairs.
  74 // A bytecode pair is any sequence of two consequtive bytecodes.
  75 
  76 class BytecodePairHistogram: AllStatic {
  77  public: // for SparcWorks
  78   enum Constants {
  79     log2_number_of_codes = 8,                         // use a power of 2 for faster addressing
  80     number_of_codes      = 1 << log2_number_of_codes, // must be no less than Bytecodes::number_of_codes
  81     number_of_pairs      = number_of_codes * number_of_codes
  82   };
  83 
  84  private:
  85   NOT_PRODUCT(static int  _index;)                      // new bytecode is shifted in - used to index into _counters
  86   NOT_PRODUCT(static int  _counters[number_of_pairs];)  // a counter for each pair
  87 
  88   friend class TemplateInterpreterGenerator;
  89 
  90  public:
  91   // Initialization
  92   static void reset()                       PRODUCT_RETURN;   // reset counters
  93 
  94   // Profile printing
  95   static void print(float cutoff = 0.01F)   PRODUCT_RETURN;   // cutoff in percent
  96 };
  97 
  98 #endif // SHARE_VM_INTERPRETER_BYTECODEHISTOGRAM_HPP