124 lines
4.5 KiB
C++
124 lines
4.5 KiB
C++
/*
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* Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_CLASSFILE_PROTECTIONDOMAINCACHE_HPP
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#define SHARE_CLASSFILE_PROTECTIONDOMAINCACHE_HPP
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#include "oops/oop.hpp"
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#include "oops/weakHandle.hpp"
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#include "memory/iterator.hpp"
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#include "utilities/hashtable.hpp"
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// This class caches the approved protection domains that can access loaded classes.
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// Dictionary entry pd_set point to entries in this hashtable. Please refer
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// to dictionary.hpp pd_set for more information about how protection domain entries
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// are used.
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// This table is walked during GC, rather than the class loader data graph dictionaries.
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class ProtectionDomainCacheEntry : public HashtableEntry<WeakHandle, mtClass> {
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friend class VMStructs;
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public:
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oop object();
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oop object_no_keepalive();
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ProtectionDomainCacheEntry* next() {
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return (ProtectionDomainCacheEntry*)HashtableEntry<WeakHandle, mtClass>::next();
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}
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ProtectionDomainCacheEntry** next_addr() {
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return (ProtectionDomainCacheEntry**)HashtableEntry<WeakHandle, mtClass>::next_addr();
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}
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void verify();
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};
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// The ProtectionDomainCacheTable contains all protection domain oops. The
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// dictionary entries reference its entries instead of having references to oops
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// directly.
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// This is used to speed up system dictionary iteration: the oops in the
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// protection domain are the only ones referring the Java heap. So when there is
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// need to update these, instead of going over every entry of the system dictionary,
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// we only need to iterate over this set.
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// The amount of different protection domains used is typically magnitudes smaller
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// than the number of system dictionary entries (loaded classes).
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class ProtectionDomainCacheTable : public Hashtable<WeakHandle, mtClass> {
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friend class VMStructs;
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private:
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ProtectionDomainCacheEntry* bucket(int i) const {
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return (ProtectionDomainCacheEntry*) Hashtable<WeakHandle, mtClass>::bucket(i);
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}
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// The following method is not MT-safe and must be done under lock.
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ProtectionDomainCacheEntry** bucket_addr(int i) {
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return (ProtectionDomainCacheEntry**) Hashtable<WeakHandle, mtClass>::bucket_addr(i);
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}
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ProtectionDomainCacheEntry* new_entry(unsigned int hash, WeakHandle protection_domain) {
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ProtectionDomainCacheEntry* entry = (ProtectionDomainCacheEntry*)
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Hashtable<WeakHandle, mtClass>::new_entry(hash, protection_domain);
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return entry;
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}
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static unsigned int compute_hash(Handle protection_domain);
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int index_for(Handle protection_domain);
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ProtectionDomainCacheEntry* add_entry(int index, unsigned int hash, Handle protection_domain);
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ProtectionDomainCacheEntry* find_entry(int index, Handle protection_domain);
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bool _dead_entries;
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int _total_oops_removed;
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public:
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ProtectionDomainCacheTable(int table_size);
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ProtectionDomainCacheEntry* get(Handle protection_domain);
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void unlink();
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void print_on(outputStream* st) const;
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void verify();
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bool has_work() { return _dead_entries; }
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void trigger_cleanup();
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int removed_entries_count() { return _total_oops_removed; };
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};
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class ProtectionDomainEntry :public CHeapObj<mtClass> {
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friend class VMStructs;
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public:
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ProtectionDomainEntry* _next;
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ProtectionDomainCacheEntry* _pd_cache;
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ProtectionDomainEntry(ProtectionDomainCacheEntry* pd_cache, ProtectionDomainEntry* next) {
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_pd_cache = pd_cache;
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_next = next;
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}
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ProtectionDomainEntry* next() { return _next; }
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void set_next(ProtectionDomainEntry* entry) { _next = entry; }
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oop object();
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oop object_no_keepalive();
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};
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#endif // SHARE_CLASSFILE_PROTECTIONDOMAINCACHE_HPP
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