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/*
* Copyright (c) 2018, 2020, 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.
*
*/

#include "precompiled.hpp"
#include "gc/shared/oopStorage.hpp"
#include "oops/access.inline.hpp"
#include "oops/oop.hpp"
#include "oops/weakHandle.inline.hpp"
#include "utilities/debug.hpp"
#include "utilities/ostream.hpp"

WeakHandle::WeakHandle(OopStorage* storage, Handle obj) :
    WeakHandle(storage, obj()) {}

WeakHandle::WeakHandle(OopStorage* storage, oop obj) :
    _obj(storage->allocate()) {
  assert(obj != NULL, "no need to create weak null oop");

  if (_obj == NULL) {
    vm_exit_out_of_memory(sizeof(oop*), OOM_MALLOC_ERROR,
                          "Unable to create new weak oop handle in OopStorage %s",
                          storage->name());
  }

  NativeAccess<ON_PHANTOM_OOP_REF>::oop_store(_obj, obj);
}

void WeakHandle::release(OopStorage* storage) const {
  // Only release if the pointer to the object has been created.
  if (_obj != NULL) {
    // Clear the WeakHandle.  For race in creating ClassLoaderData, we can release this
    // WeakHandle before it is cleared by GC.
    NativeAccess<ON_PHANTOM_OOP_REF>::oop_store(_obj, (oop)NULL);
    storage->release(_obj);
  }
}

void WeakHandle::print() const { print_on(tty); }

void WeakHandle::print_on(outputStream* st) const {
  st->print("WeakHandle: " PTR_FORMAT, p2i(peek()));
}

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^© Kompilation durch diese Firma

[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]

Datei: Sprache: C

¤ Dauer der Verarbeitung: 0.0 Sekunden (vorverarbeitet) ¤

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