1 /*
 2  * Copyright (c) 2018, 2025, 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
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24 
25 #ifndef SHARE_CLASSFILE_CLASSLOADERDATAGRAPH_INLINE_HPP
26 #define SHARE_CLASSFILE_CLASSLOADERDATAGRAPH_INLINE_HPP
27 
28 #include "classfile/classLoaderDataGraph.hpp"
29 
30 #include "classfile/javaClasses.hpp"
31 #include "oops/oop.inline.hpp"
32 #include "runtime/atomicAccess.hpp"
33 #include "runtime/orderAccess.hpp"
34 
35 inline ClassLoaderData *ClassLoaderDataGraph::find_or_create(Handle loader) {
36   guarantee(loader() != nullptr && oopDesc::is_oop(loader()), "Loader must be oop");
37   // Gets the class loader data out of the java/lang/ClassLoader object, if non-null
38   // it's already in the loader_data, so no need to add
39   ClassLoaderData* loader_data = java_lang_ClassLoader::loader_data_acquire(loader());
40   if (loader_data) {
41      return loader_data;
42   }
43   return ClassLoaderDataGraph::add(loader, false);
44 }
45 
46 size_t ClassLoaderDataGraph::num_instance_classes() {
47   return AtomicAccess::load(&_num_instance_classes);
48 }
49 
50 size_t ClassLoaderDataGraph::num_array_classes() {
51   return AtomicAccess::load(&_num_array_classes);
52 }
53 
54 void ClassLoaderDataGraph::inc_instance_classes(size_t count) {
55   AtomicAccess::add(&_num_instance_classes, count, memory_order_relaxed);
56 }
57 
58 void ClassLoaderDataGraph::dec_instance_classes(size_t count) {
59   size_t old_count = AtomicAccess::fetch_then_add(&_num_instance_classes, -count, memory_order_relaxed);
60   assert(old_count >= count, "Sanity");
61 }
62 
63 void ClassLoaderDataGraph::inc_array_classes(size_t count) {
64   AtomicAccess::add(&_num_array_classes, count, memory_order_relaxed);
65 }
66 
67 void ClassLoaderDataGraph::dec_array_classes(size_t count) {
68   size_t old_count = AtomicAccess::fetch_then_add(&_num_array_classes, -count, memory_order_relaxed);
69   assert(old_count >= count, "Sanity");
70 }
71 
72 bool ClassLoaderDataGraph::should_clean_metaspaces_and_reset() {
73   // Only clean metaspaces after full GC.
74   bool do_cleaning = _safepoint_cleanup_needed;
75 #if INCLUDE_JVMTI
76   do_cleaning = do_cleaning && (_should_clean_deallocate_lists || InstanceKlass::should_clean_previous_versions());
77 #else
78   do_cleaning = do_cleaning && _should_clean_deallocate_lists;
79 #endif
80   _safepoint_cleanup_needed = false;  // reset
81   return do_cleaning;
82 }
83 
84 #endif // SHARE_CLASSFILE_CLASSLOADERDATAGRAPH_INLINE_HPP