Quelle iterator.inline.hpp Sprache: C

/*
* Copyright (c) 2014, 2022, 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_MEMORY_ITERATOR_INLINE_HPP
#define SHARE_MEMORY_ITERATOR_INLINE_HPP

#include "memory/iterator.hpp"

#include "classfile/classLoaderData.hpp"
#include "code/nmethod.hpp"
#include "oops/access.inline.hpp"
#include "oops/compressedOops.inline.hpp"
#include "oops/klass.hpp"
#include "oops/instanceKlass.inline.hpp"
#include "oops/instanceMirrorKlass.inline.hpp"
#include "oops/instanceClassLoaderKlass.inline.hpp"
#include "oops/instanceRefKlass.inline.hpp"
#include "oops/instanceStackChunkKlass.inline.hpp"
#include "oops/objArrayKlass.inline.hpp"
#include "oops/typeArrayKlass.inline.hpp"
#include "utilities/debug.hpp"

// Defaults to strong claiming.
inline MetadataVisitingOopIterateClosure::MetadataVisitingOopIterateClosure(ReferenceDiscoverer* rd) :
    ClaimMetadataVisitingOopIterateClosure(ClassLoaderData::_claim_strong, rd) {}

inline void ClaimMetadataVisitingOopIterateClosure::do_cld(ClassLoaderData* cld) {
  cld->oops_do(this, _claim);
}

inline void ClaimMetadataVisitingOopIterateClosure::do_klass(Klass* k) {
  ClassLoaderData* cld = k->class_loader_data();
  ClaimMetadataVisitingOopIterateClosure::do_cld(cld);
}

inline void ClaimMetadataVisitingOopIterateClosure::do_nmethod(nmethod* nm) {
  nm->follow_nmethod(this);
}

inline void ClaimMetadataVisitingOopIterateClosure::do_method(Method* m) {
  // Mark interpreted frames for class redefinition
  m->record_gc_epoch();
}

// Dispatch table implementation for *Klass::oop_oop_iterate
//
// It allows for a single call to do a multi-dispatch to an optimized version
//   of oop_oop_iterate that statically know all these types:
//   - OopClosureType    : static type give at call site
//   - Klass*            : dynamic to static type through Klass::kind() -> table index
//   - UseCompressedOops : dynamic to static value determined once
//
// when users call obj->oop_iterate(&cl).
//
// oopDesc::oop_iterate() calls OopOopIterateDispatch::function(klass)(cl, obj, klass),
//   which dispatches to an optimized version of
//   [Instance, ObjArry, etc]Klass::oop_oop_iterate(oop, OopClosureType)
//
// OopClosureType :
//   If OopClosureType has an implementation of do_oop (and do_metadata et.al.),
//   then the static type of OopClosureType will be used to allow inlining of
//   do_oop (even though do_oop is virtual). Otherwise, a virtual call will be
//   used when calling do_oop.
//
// Klass* :
//   A table mapping from *Klass::Kind to function is setup. This happens once
//   when the program starts, when the static _table instance is initialized for
//   the OopOopIterateDispatch specialized with the OopClosureType.
//
// UseCompressedOops :
//   Initially the table is populated with an init function, and not the actual
//   oop_oop_iterate function. This is done, so that the first time we dispatch
//   through the init function we check what the value of UseCompressedOops
//   became, and use that to determine if we should install an optimized
//   narrowOop version or optimized oop version of oop_oop_iterate. The appropriate
//   oop_oop_iterate function replaces the init function in the table, and
//   succeeding calls will jump directly to oop_oop_iterate.

template <typename OopClosureType>
class OopOopIterateDispatch : public AllStatic {
private:
  typedef void (*FunctionType)(OopClosureType*, oop, Klass*);

  class Table {
  private:
    template <typename KlassType, typename T>
    static void oop_oop_iterate(OopClosureType* cl, oop obj, Klass* k) {
      ((KlassType*)k)->KlassType::template oop_oop_iterate<T>(obj, cl);
    }

    template <typename KlassType>
    static void init(OopClosureType* cl, oop obj, Klass* k) {
      OopOopIterateDispatch<OopClosureType>::_table.set_resolve_function_and_execute<KlassType>(cl, obj, k);
    }

    template <typename KlassType>
    void set_init_function() {
      _function[KlassType::Kind] = &init<KlassType>;
    }

    template <typename KlassType>
    void set_resolve_function() {
      // Size requirement to prevent word tearing
      // when functions pointers are updated.
      STATIC_ASSERT(sizeof(_function[0]) == sizeof(void*));
      if (UseCompressedOops) {
        _function[KlassType::Kind] = &oop_oop_iterate<KlassType, narrowOop>;
      } else {
        _function[KlassType::Kind] = &oop_oop_iterate<KlassType, oop>;
      }
    }

    template <typename KlassType>
    void set_resolve_function_and_execute(OopClosureType* cl, oop obj, Klass* k) {
      set_resolve_function<KlassType>();
      _function[KlassType::Kind](cl, obj, k);
    }

  public:
    FunctionType _function[KLASS_KIND_COUNT];

    Table(){
      set_init_function<InstanceKlass>();
      set_init_function<InstanceRefKlass>();
      set_init_function<InstanceMirrorKlass>();
      set_init_function<InstanceClassLoaderKlass>();
      set_init_function<InstanceStackChunkKlass>();
      set_init_function<ObjArrayKlass>();
      set_init_function<TypeArrayKlass>();
    }
  };

  static Table _table;
public:

  static FunctionType function(Klass* klass) {
    return _table._function[klass->kind()];
  }
};

template <typename OopClosureType>
typename OopOopIterateDispatch<OopClosureType>::Table OopOopIterateDispatch<OopClosureType>::_table;

template <typename OopClosureType>
class OopOopIterateBoundedDispatch {
private:
  typedef void (*FunctionType)(OopClosureType*, oop, Klass*, MemRegion);

  class Table {
  private:
    template <typename KlassType, typename T>
    static void oop_oop_iterate_bounded(OopClosureType* cl, oop obj, Klass* k, MemRegion mr) {
      ((KlassType*)k)->KlassType::template oop_oop_iterate_bounded<T>(obj, cl, mr);
    }

    template <typename KlassType>
    static void init(OopClosureType* cl, oop obj, Klass* k, MemRegion mr) {
      OopOopIterateBoundedDispatch<OopClosureType>::_table.set_resolve_function_and_execute<KlassType>(cl, obj, k, mr);
    }

    template <typename KlassType>
    void set_init_function() {
      _function[KlassType::Kind] = &init<KlassType>;
    }

    template <typename KlassType>
    void set_resolve_function() {
      if (UseCompressedOops) {
        _function[KlassType::Kind] = &oop_oop_iterate_bounded<KlassType, narrowOop>;
      } else {
        _function[KlassType::Kind] = &oop_oop_iterate_bounded<KlassType, oop>;
      }
    }

    template <typename KlassType>
    void set_resolve_function_and_execute(OopClosureType* cl, oop obj, Klass* k, MemRegion mr) {
      set_resolve_function<KlassType>();
      _function[KlassType::Kind](cl, obj, k, mr);
    }

  public:
    FunctionType _function[KLASS_KIND_COUNT];

    Table(){
      set_init_function<InstanceKlass>();
      set_init_function<InstanceRefKlass>();
      set_init_function<InstanceMirrorKlass>();
      set_init_function<InstanceClassLoaderKlass>();
      set_init_function<InstanceStackChunkKlass>();
      set_init_function<ObjArrayKlass>();
      set_init_function<TypeArrayKlass>();
    }
  };

  static Table _table;
public:

  static FunctionType function(Klass* klass) {
    return _table._function[klass->kind()];
  }
};

template <typename OopClosureType>
typename OopOopIterateBoundedDispatch<OopClosureType>::Table OopOopIterateBoundedDispatch<OopClosureType>::_table;

template <typename OopClosureType>
class OopOopIterateBackwardsDispatch {
private:
  typedef void (*FunctionType)(OopClosureType*, oop, Klass*);

  class Table {
  private:
    template <typename KlassType, typename T>
    static void oop_oop_iterate_backwards(OopClosureType* cl, oop obj, Klass* k) {
      ((KlassType*)k)->KlassType::template oop_oop_iterate_reverse<T>(obj, cl);
    }

    template <typename KlassType>
    static void init(OopClosureType* cl, oop obj, Klass* k) {
      OopOopIterateBackwardsDispatch<OopClosureType>::_table.set_resolve_function_and_execute<KlassType>(cl, obj, k);
    }

    template <typename KlassType>
    void set_init_function() {
      _function[KlassType::Kind] = &init<KlassType>;
    }

    template <typename KlassType>
    void set_resolve_function() {
      if (UseCompressedOops) {
        _function[KlassType::Kind] = &oop_oop_iterate_backwards<KlassType, narrowOop>;
      } else {
        _function[KlassType::Kind] = &oop_oop_iterate_backwards<KlassType, oop>;
      }
    }

    template <typename KlassType>
    void set_resolve_function_and_execute(OopClosureType* cl, oop obj, Klass* k) {
      set_resolve_function<KlassType>();
      _function[KlassType::Kind](cl, obj, k);
    }

  public:
    FunctionType _function[KLASS_KIND_COUNT];

    Table(){
      set_init_function<InstanceKlass>();
      set_init_function<InstanceRefKlass>();
      set_init_function<InstanceMirrorKlass>();
      set_init_function<InstanceClassLoaderKlass>();
      set_init_function<InstanceStackChunkKlass>();
      set_init_function<ObjArrayKlass>();
      set_init_function<TypeArrayKlass>();
    }
  };

  static Table _table;
public:

  static FunctionType function(Klass* klass) {
    return _table._function[klass->kind()];
  }
};

template <typename OopClosureType>
typename OopOopIterateBackwardsDispatch<OopClosureType>::Table OopOopIterateBackwardsDispatch<OopClosureType>::_table;

template <typename OopClosureType>
void OopIteratorClosureDispatch::oop_oop_iterate(OopClosureType* cl, oop obj, Klass* klass) {
  OopOopIterateDispatch<OopClosureType>::function(klass)(cl, obj, klass);
}

template <typename OopClosureType>
void OopIteratorClosureDispatch::oop_oop_iterate(OopClosureType* cl, oop obj, Klass* klass, MemRegion mr) {
  OopOopIterateBoundedDispatch<OopClosureType>::function(klass)(cl, obj, klass, mr);
}

template <typename OopClosureType>
void OopIteratorClosureDispatch::oop_oop_iterate_backwards(OopClosureType* cl, oop obj, Klass* klass) {
  OopOopIterateBackwardsDispatch<OopClosureType>::function(klass)(cl, obj, klass);
}

#endif // SHARE_MEMORY_ITERATOR_INLINE_HPP

quality100%

¤ Dauer der Verarbeitung: 0.12 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.