jdk8-mips64-public/hotspot: src/share/vm/runtime/timer.hpp@63147986a428

8019835: Strings interned in different threads equal but does not ==
Summary: Add -XX:+VerifyStringTableAtExit option and code to verify StringTable invariants.
Reviewed-by: rdurbin, sspitsyn, coleenp

     1 /*

     2  * Copyright (c) 1997, 2013, 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  */

    25 #ifndef SHARE_VM_RUNTIME_TIMER_HPP

    26 #define SHARE_VM_RUNTIME_TIMER_HPP

    28 #include "utilities/globalDefinitions.hpp"

    30 // Timers for simple measurement.

    32 class elapsedTimer VALUE_OBJ_CLASS_SPEC {

    33   friend class VMStructs;

    34  private:

    35   jlong _counter;

    36   jlong _start_counter;

    37   bool  _active;

    38  public:

    39   elapsedTimer()             { _active = false; reset(); }

    40   void add(elapsedTimer t);

    41   void start();

    42   void stop();

    43   void reset()               { _counter = 0; }

    44   double seconds() const;

    45   jlong milliseconds() const;

    46   jlong ticks() const        { return _counter; }

    47   jlong active_ticks() const;

    48   bool  is_active() const { return _active; }

    49 };

    51 // TimeStamp is used for recording when an event took place.

    52 class TimeStamp VALUE_OBJ_CLASS_SPEC {

    53  private:

    54   jlong _counter;

    55  public:

    56   TimeStamp()  { _counter = 0; }

    57   void clear() { _counter = 0; }

    58   // has the timestamp been updated since being created or cleared?

    59   bool is_updated() const { return _counter != 0; }

    60   // update to current elapsed time

    61   void update();

    62   // update to given elapsed time

    63   void update_to(jlong ticks);

    64   // returns seconds since updated

    65   // (must not be in a cleared state:  must have been previously updated)

    66   double seconds() const;

    67   jlong milliseconds() const;

    68   // ticks elapsed between VM start and last update

    69   jlong ticks() const { return _counter; }

    70   // ticks elapsed since last update

    71   jlong ticks_since_update() const;

    72 };

    74 // TraceTime is used for tracing the execution time of a block

    75 // Usage:

    76 //  { TraceTime t("block time")

    77 //    some_code();

    78 //  }

    79 //

    81 class TraceTime: public StackObj {

    82  private:

    83   bool          _active;    // do timing

    84   bool          _verbose;   // report every timing

    85   elapsedTimer  _t;         // timer

    86   elapsedTimer* _accum;     // accumulator

    87  public:

    88   // Constructors

    89   TraceTime(const char* title,

    90             bool doit = true);

    91   TraceTime(const char* title,

    92             elapsedTimer* accumulator,

    93             bool doit = true,

    94             bool verbose = false);

    95   ~TraceTime();

    97   // Accessors

    98   void set_verbose(bool verbose)  { _verbose = verbose; }

    99   bool verbose() const            { return _verbose;    }

   101   // Activation

   102   void suspend()  { if (_active) _t.stop();  }

   103   void resume()   { if (_active) _t.start(); }

   104 };

   106 class TraceCPUTime: public StackObj {

   107  private:

   108   bool _active;                 // true if times will be measured and printed

   109   bool _print_cr;               // if true print carriage return at end

   110   double _starting_user_time;   // user time at start of measurement

   111   double _starting_system_time; // system time at start of measurement

   112   double _starting_real_time;   // real time at start of measurement

   113   outputStream* _logfile;       // output is printed to this stream

   114   bool _error;                  // true if an error occurred, turns off output

   116  public:

   117   TraceCPUTime(bool doit = true,

   118                bool print_cr = true,

   119                outputStream *logfile = NULL);

   120   ~TraceCPUTime();

   121 };

   123 class TimeHelper {

   124  public:

   125   static double counter_to_seconds(jlong counter);

   126 };

   128 #endif // SHARE_VM_RUNTIME_TIMER_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/runtime/timer.hpp@63147986a428

src/share/vm/runtime/timer.hpp