/*

 * Copyright (c) 2001, 2012, 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_MEMORY_SPECIALIZED_OOP_CLOSURES_HPP

#define SHARE_VM_MEMORY_SPECIALIZED_OOP_CLOSURES_HPP

#include "runtime/atomic.hpp"

#include "gc_implementation/g1/g1_specialized_oop_closures.hpp"

// The following OopClosure types get specialized versions of

// "oop_oop_iterate" that invoke the closures' do_oop methods

// non-virtually, using a mechanism defined in this file.  Extend these

// macros in the obvious way to add specializations for new closures.

// Forward declarations.

class OopClosure;

class OopsInGenClosure;

// DefNew

class ScanClosure;

class FastScanClosure;

class FilteringClosure;

// ParNew

class ParScanWithBarrierClosure;

class ParScanWithoutBarrierClosure;

// CMS

class MarkRefsIntoAndScanClosure;

class Par_MarkRefsIntoAndScanClosure;

class PushAndMarkClosure;

class Par_PushAndMarkClosure;

class PushOrMarkClosure;

class Par_PushOrMarkClosure;

class CMSKeepAliveClosure;

class CMSInnerParMarkAndPushClosure;

// Misc

class NoHeaderExtendedOopClosure;

// This macro applies an argument macro to all OopClosures for which we

// want specialized bodies of "oop_oop_iterate".  The arguments to "f" are:

//   "f(closureType, non_virtual)"

// where "closureType" is the name of the particular subclass of OopClosure,

// and "non_virtual" will be the string "_nv" if the closure type should

// have its "do_oop" method invoked non-virtually, or else the

// string "_v".  ("OopClosure" itself will be the only class in the latter

// category.)

// This is split into several because of a Visual C++ 6.0 compiler bug

// where very long macros cause the compiler to crash

// Some other heap might define further specialized closures.

#ifndef FURTHER_SPECIALIZED_OOP_OOP_ITERATE_CLOSURES

#define FURTHER_SPECIALIZED_OOP_OOP_ITERATE_CLOSURES(f) \

        /* None */

#endif

#define SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_S(f)       \

  f(ScanClosure,_nv)                                    \

  f(FastScanClosure,_nv)                                \

  f(FilteringClosure,_nv)

#define SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_P(f)       \

  f(ParScanWithBarrierClosure,_nv)                      \

  f(ParScanWithoutBarrierClosure,_nv)

#define SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_P(f)

#define SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(f)       \

  f(NoHeaderExtendedOopClosure,_nv)                     \

  SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_S(f)             \

  SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_P(f)

#define SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_2(f)       \

  f(MarkRefsIntoAndScanClosure,_nv)                     \

  f(Par_MarkRefsIntoAndScanClosure,_nv)                 \

  f(PushAndMarkClosure,_nv)                             \

  f(Par_PushAndMarkClosure,_nv)                         \

  f(PushOrMarkClosure,_nv)                              \

  f(Par_PushOrMarkClosure,_nv)                          \

  f(CMSKeepAliveClosure,_nv)                            \

  f(CMSInnerParMarkAndPushClosure,_nv)                  \

  FURTHER_SPECIALIZED_OOP_OOP_ITERATE_CLOSURES(f)

#define SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_2(f)

// We separate these out, because sometime the general one has

// a different definition from the specialized ones, and sometimes it

// doesn't.

#define ALL_OOP_OOP_ITERATE_CLOSURES_1(f)               \

  f(ExtendedOopClosure,_v)                              \

  SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(f)

#define ALL_OOP_OOP_ITERATE_CLOSURES_2(f)               \

  SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_2(f)

// This macro applies an argument macro to all OopClosures for which we

// want specialized bodies of a family of methods related to

// "par_oop_iterate".  The arguments to f are the same as above.

// The "root_class" is the most general class to define; this may be

// "OopClosure" in some applications and "OopsInGenClosure" in others.

#define SPECIALIZED_PAR_OOP_ITERATE_CLOSURES(f)        \

  f(MarkRefsIntoAndScanClosure,_nv)                    \

  f(PushAndMarkClosure,_nv)                            \

  f(Par_MarkRefsIntoAndScanClosure,_nv)                \

  f(Par_PushAndMarkClosure,_nv)

#define ALL_PAR_OOP_ITERATE_CLOSURES(f)                \

  f(ExtendedOopClosure,_v)                             \

  SPECIALIZED_PAR_OOP_ITERATE_CLOSURES(f)

// This macro applies an argument macro to all OopClosures for which we

// want specialized bodies of a family of methods related to

// "oops_since_save_marks_do".  The arguments to f are the same as above.

// The "root_class" is the most general class to define; this may be

// "OopClosure" in some applications and "OopsInGenClosure" in others.

// Some other heap might define further specialized closures.

#ifndef FURTHER_SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES

#define FURTHER_SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(f) \

        /* None */

#endif

#define SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES_YOUNG_S(f) \

  f(ScanClosure,_nv)                                     \

  f(FastScanClosure,_nv)

#define SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES_YOUNG_P(f) \

  f(ParScanWithBarrierClosure,_nv)                       \

  f(ParScanWithoutBarrierClosure,_nv)                    \

  FURTHER_SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(f)

#define SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES_YOUNG_P(f)

#define SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES_YOUNG(f)  \

  SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES_YOUNG_S(f)      \

  SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES_YOUNG_P(f)

#define SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(f)        \

  SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES_YOUNG(f)

// We separate these out, because sometime the general one has

// a different definition from the specialized ones, and sometimes it

// doesn't.

// NOTE:   One of the valid criticisms of this

// specialize-oop_oop_iterate-for-specific-closures idiom is that it is

// easy to have a silent performance bug: if you fail to de-virtualize,

// things still work, just slower.  The "SpecializationStats" mode is

// intended to at least make such a failure easy to detect.

// *Not* using the ALL_SINCE_SAVE_MARKS_CLOSURES(f) macro defined

// below means that *only* closures for which oop_oop_iterate specializations

// exist above may be applied to "oops_since_save_marks".  That is,

// this form of the performance bug is caught statically.  When you add

// a definition for the general type, this property goes away.

// Make sure you test with SpecializationStats to find such bugs

// when introducing a new closure where you don't want virtual dispatch.

#define ALL_SINCE_SAVE_MARKS_CLOSURES(f)                \

  f(OopsInGenClosure,_v)                                \

  SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(f)

// For keeping stats on effectiveness.

#define ENABLE_SPECIALIZATION_STATS 0

class SpecializationStats {

public:

  enum Kind {

    ik,             // InstanceKlass

    irk,            // InstanceRefKlass

    oa,             // ObjArrayKlass

    NUM_Kinds

  };

#if ENABLE_SPECIALIZATION_STATS

private:

  static bool _init;

  static bool _wrapped;

  static jint _numCallsAll;

  static jint _numCallsTotal[NUM_Kinds];

  static jint _numCalls_nv[NUM_Kinds];

  static jint _numDoOopCallsTotal[NUM_Kinds];

  static jint _numDoOopCalls_nv[NUM_Kinds];

public:

#endif

  static void clear()  PRODUCT_RETURN;

  static inline void record_call()  PRODUCT_RETURN;

  static inline void record_iterate_call_v(Kind k)  PRODUCT_RETURN;

  static inline void record_iterate_call_nv(Kind k)  PRODUCT_RETURN;

  static inline void record_do_oop_call_v(Kind k)  PRODUCT_RETURN;

  static inline void record_do_oop_call_nv(Kind k)  PRODUCT_RETURN;

  static void print() PRODUCT_RETURN;

};

#ifndef PRODUCT

#if ENABLE_SPECIALIZATION_STATS

inline void SpecializationStats::record_call() {

  Atomic::inc(&_numCallsAll);

}

inline void SpecializationStats::record_iterate_call_v(Kind k) {

  Atomic::inc(&_numCallsTotal[k]);

}

inline void SpecializationStats::record_iterate_call_nv(Kind k) {

  Atomic::inc(&_numCallsTotal[k]);

  Atomic::inc(&_numCalls_nv[k]);

}

inline void SpecializationStats::record_do_oop_call_v(Kind k) {

  Atomic::inc(&_numDoOopCallsTotal[k]);

}

inline void SpecializationStats::record_do_oop_call_nv(Kind k) {

  Atomic::inc(&_numDoOopCallsTotal[k]);

  Atomic::inc(&_numDoOopCalls_nv[k]);

}

#else   // !ENABLE_SPECIALIZATION_STATS

inline void SpecializationStats::record_call() {}

inline void SpecializationStats::record_iterate_call_v(Kind k) {}

inline void SpecializationStats::record_iterate_call_nv(Kind k) {}

inline void SpecializationStats::record_do_oop_call_v(Kind k) {}

inline void SpecializationStats::record_do_oop_call_nv(Kind k) {}

inline void SpecializationStats::clear() {}

inline void SpecializationStats::print() {}

#endif  // ENABLE_SPECIALIZATION_STATS

#endif  // !PRODUCT

#endif // SHARE_VM_MEMORY_SPECIALIZED_OOP_CLOSURES_HPP