JDK14/Java14源码在线阅读

/*
 * Copyright (c) 1997, 2019, 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
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#ifndef SHARE_INTERPRETER_BYTECODEHISTOGRAM_HPP
#define SHARE_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         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 solstudio
  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

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