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1 /* |
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2 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 #include "precompiled.hpp" |
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26 #include "classfile/systemDictionary.hpp" |
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27 #include "gc/shared/oopStorage.hpp" |
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28 #include "oops/access.inline.hpp" |
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29 #include "oops/oop.hpp" |
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30 #include "oops/weakHandle.inline.hpp" |
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31 #include "utilities/debug.hpp" |
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32 #include "utilities/ostream.hpp" |
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33 |
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34 template <> OopStorage* WeakHandle<vm_class_loader_data>::get_storage() { |
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35 return SystemDictionary::vm_weak_oop_storage(); |
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36 } |
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37 |
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38 template <WeakHandleType T> |
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39 WeakHandle<T> WeakHandle<T>::create(Handle obj) { |
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40 assert(obj() != NULL, "no need to create weak null oop"); |
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41 oop* oop_addr = get_storage()->allocate(); |
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42 if (oop_addr == NULL) { |
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43 vm_exit_out_of_memory(sizeof(oop*), OOM_MALLOC_ERROR, "Unable to create new weak oop handle in OopStorage"); |
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44 } |
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45 // Create WeakHandle with address returned and store oop into it. |
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46 RootAccess<ON_PHANTOM_OOP_REF>::oop_store(oop_addr, obj()); |
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47 return WeakHandle(oop_addr); |
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48 } |
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49 |
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50 template <WeakHandleType T> |
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51 void WeakHandle<T>::release() const { |
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52 // Only release if the pointer to the object has been created. |
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53 if (_obj != NULL) { |
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54 // Clear the WeakHandle. For class loader data race, the handle may not have |
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55 // been previously cleared by GC. |
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56 RootAccess<ON_PHANTOM_OOP_REF>::oop_store(_obj, (oop)NULL); |
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57 get_storage()->release(_obj); |
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58 } |
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59 } |
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60 |
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61 template <WeakHandleType T> |
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62 void WeakHandle<T>::print() const { print_on(tty); } |
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63 |
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64 template <WeakHandleType T> |
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65 void WeakHandle<T>::print_on(outputStream* st) const { |
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66 st->print("WeakHandle: " PTR_FORMAT, p2i(peek())); |
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67 } |
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68 |
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69 // Provide instantiation. |
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70 template class WeakHandle<vm_class_loader_data>; |
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71 |