1 /*
2 * Copyright (c) 2010, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
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23 */
24
25 #ifndef SHARE_MEMORY_METADATAFACTORY_HPP
26 #define SHARE_MEMORY_METADATAFACTORY_HPP
27
28 #include "classfile/classLoaderData.hpp"
29 #include "memory/classLoaderMetaspace.hpp"
30 #include "oops/array.inline.hpp"
31 #include "utilities/exceptions.hpp"
32 #include "utilities/globalDefinitions.hpp"
33 #include <type_traits>
34
35 class MetadataFactory : AllStatic {
36 public:
37 template <typename T>
38 static Array<T>* new_array(ClassLoaderData* loader_data, int length, TRAPS) {
39 return new (loader_data, length, THREAD) Array<T>(length);
40 }
41
42 template <typename T>
43 static Array<T>* new_array(ClassLoaderData* loader_data, int length, T value, TRAPS) {
44 Array<T>* array = new_array<T>(loader_data, length, CHECK_NULL);
45 for (int i = 0; i < length; i++) {
46 array->at_put(i, value);
47 }
48 return array;
49 }
50
51 // Work-around -- see JDK-8331086.
52 // This API should be used for TrainingData only.
53 template <typename T>
54 static Array<T>* new_array_from_c_heap(int length, MEMFLAGS flags) {
55 return new (length, flags) Array<T>(length);
56 }
57
58 template <typename T>
59 static void free_array(ClassLoaderData* loader_data, Array<T>* data) {
60 if (data != nullptr) {
61 assert(loader_data != nullptr, "shouldn't pass null");
62 assert(!data->is_shared(), "cannot deallocate array in shared spaces");
63 int size = data->size();
64 loader_data->metaspace_non_null()->deallocate((MetaWord*)data, size, false);
65 }
66 }
67
68 // Deallocation method for metadata
69 template <class T>
70 static void free_metadata(ClassLoaderData* loader_data, T* md) {
71 if (md != nullptr) {
72 assert(loader_data != nullptr, "shouldn't pass null");
73 int size = md->size();
74 // Call metadata's deallocate function which will deallocate fields and release_C_heap_structures
75 assert(!md->on_stack(), "can't deallocate things on stack");
76 assert(!md->is_shared(), "cannot deallocate if in shared spaces");
77 md->deallocate_contents(loader_data);
78 bool is_klass = md->is_klass();
79 // Call the destructor. This is currently used for MethodData which has a member
80 // that needs to be destructed to release resources. Most Metadata derived classes have noop
81 // destructors and/or cleanup using deallocate_contents.
82 // T is a potentially const or volatile qualified pointer. Remove any const
83 // or volatile so we can call the destructor of the type T points to.
84 using U = std::remove_cv_t<T>;
85 md->~U();
86 loader_data->metaspace_non_null()->deallocate((MetaWord*)md, size, is_klass);
87 }
88 }
89 };
90
91 #endif // SHARE_MEMORY_METADATAFACTORY_HPP