/*

 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#ifndef SHARE_VM_INTERPRETER_BYTECODEHISTOGRAM_HPP

#define SHARE_VM_INTERPRETER_BYTECODEHISTOGRAM_HPP

#include "interpreter/bytecodes.hpp"

#include "memory/allocation.hpp"

// BytecodeCounter counts the number of bytecodes executed

class BytecodeCounter: AllStatic {

 private:

  NOT_PRODUCT(static int   _counter_value;)

  NOT_PRODUCT(static jlong _reset_time;)

  friend class TemplateInterpreterGenerator;

  friend class         BytecodeInterpreter;

 public:

  // Initialization

  static void reset()                      PRODUCT_RETURN;

  // Counter info (all info since last reset)

  static int    counter_value()            PRODUCT_RETURN0 NOT_PRODUCT({ return _counter_value; });

  static double elapsed_time()             PRODUCT_RETURN0; // in seconds

  static double frequency()                PRODUCT_RETURN0; // bytecodes/seconds

  // Counter printing

  static void   print()                    PRODUCT_RETURN;

};

// BytecodeHistogram collects number of executions of bytecodes

class BytecodeHistogram: AllStatic {

 private:

  NOT_PRODUCT(static int _counters[Bytecodes::number_of_codes];)   // a counter for each bytecode

  friend class TemplateInterpreterGenerator;

  friend class         InterpreterGenerator;

  friend class         BytecodeInterpreter;

 public:

  // Initialization

  static void reset()                       PRODUCT_RETURN; // reset counters

  // Profile printing

  static void print(float cutoff = 0.01F)   PRODUCT_RETURN; // cutoff in percent

};

// BytecodePairHistogram collects number of executions of bytecode pairs.

// A bytecode pair is any sequence of two consequtive bytecodes.

class BytecodePairHistogram: AllStatic {

 public: // for SparcWorks

  enum Constants {

    log2_number_of_codes = 8,                         // use a power of 2 for faster addressing

    number_of_codes      = 1 << log2_number_of_codes, // must be no less than Bytecodes::number_of_codes

    number_of_pairs      = number_of_codes * number_of_codes

  };

 private:

  NOT_PRODUCT(static int  _index;)                      // new bytecode is shifted in - used to index into _counters

  NOT_PRODUCT(static int  _counters[number_of_pairs];)  // a counter for each pair

  friend class TemplateInterpreterGenerator;

  friend class         InterpreterGenerator;

 public:

  // Initialization

  static void reset()                       PRODUCT_RETURN;   // reset counters

  // Profile printing

  static void print(float cutoff = 0.01F)   PRODUCT_RETURN;   // cutoff in percent

};

#endif // SHARE_VM_INTERPRETER_BYTECODEHISTOGRAM_HPP