Quellcode-Bibliothek

^© Kompilation durch diese Firma

[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]

Datei: oopHandle.hpp Sprache: C

/*
* Copyright (c) 2017, 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_OOPS_OOPHANDLE_HPP
#define SHARE_OOPS_OOPHANDLE_HPP

#include "metaprogramming/primitiveConversions.hpp"
#include "oops/oopsHierarchy.hpp"

class OopStorage;

// Simple classes for wrapping oop and atomically accessed oop pointers
// stored in OopStorage, or stored in the ClassLoaderData handles area.
// These classes help with allocation, release, and NativeAccess loads and
// stores with the appropriate barriers.

class OopHandle {
  friend class VMStructs;
private:
  oop* _obj;

public:
  OopHandle() : _obj(NULL) {}
  explicit OopHandle(oop* w) : _obj(w) {}
  OopHandle(OopStorage* storage, oop obj);

  OopHandle(const OopHandle& copy) : _obj(copy._obj) {}

  OopHandle& operator=(const OopHandle& copy) {
    // Allow "this" to be junk if copy is empty; needed by initialization of
    // raw memory in hashtables.
    assert(is_empty() || copy.is_empty(), "can only copy if empty");
    _obj = copy._obj;
    return *this;
  }

  void swap(OopHandle& copy) {
    ::swap(_obj, copy._obj);
  }

  inline oop resolve() const;
  inline oop peek() const;

  bool is_empty() const { return _obj == NULL; }

  inline void release(OopStorage* storage);

  inline void replace(oop obj);

  inline oop xchg(oop new_value);

  oop* ptr_raw() const { return _obj; }
};

// Convert OopHandle to oop*

template<>
struct PrimitiveConversions::Translate<OopHandle> : public TrueType {
  typedef OopHandle Value;
  typedef oop* Decayed;

  static Decayed decay(Value x) { return x.ptr_raw(); }
  static Value recover(Decayed x) { return OopHandle(x); }
};

#endif // SHARE_OOPS_OOPHANDLE_HPP

¤ Dauer der Verarbeitung: 0.18 Sekunden (vorverarbeitet) ¤

Download des Quellennavigators
Download des sprechenden Kalenders
in der Quellcodebibliothek suchen

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.