--- /dev/null 2018-03-24 19:23:43.035000297 -0400 +++ new/src/hotspot/share/oops/weakHandle.cpp 2018-03-26 13:40:57.002286153 -0400 @@ -0,0 +1,67 @@ +/* + * Copyright (c) 2018, 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 "memory/universe.hpp" +#include "oops/access.inline.hpp" +#include "oops/oop.hpp" +#include "oops/weakHandle.hpp" +#include "utilities/debug.hpp" +#include "utilities/ostream.hpp" + +WeakHandle WeakHandle::create(Handle obj) { + assert(obj() != NULL, "no need to create weak null oop"); + oop* oop_addr = Universe::vm_weak_oop_storage()->allocate(); + if (oop_addr == NULL) { + vm_exit_out_of_memory(sizeof(oop*), OOM_MALLOC_ERROR, "Unable to create new weak oop handle in OopStorage"); + } + // Create WeakHandle with address returned and store oop into it. + RootAccess::oop_store(oop_addr, obj()); + return WeakHandle(oop_addr); +} + +oop WeakHandle::resolve() const { + if (_obj == NULL) { + return NULL; // for initialization + } + return RootAccess::oop_load(_obj); +} + +oop WeakHandle::peek() const { + if (_obj == NULL) { + return NULL; // needed? + } + return RootAccess::oop_load(_obj); +} + +void WeakHandle::release() const { + Universe::vm_weak_oop_storage()->release(_obj); +} + +void WeakHandle::print() const { print_on(tty); } + +void WeakHandle::print_on(outputStream* st) const { + st->print("WeakHandle: " PTR_FORMAT, p2i(peek())); +}