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/*
* Copyright (c) 2003, 2022, 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.
*
*/
#ifndef SHARE_CLASSFILE_DICTIONARY_HPP
#define SHARE_CLASSFILE_DICTIONARY_HPP
#include "oops/instanceKlass.hpp"
#include "oops/oop.hpp"
#include "oops/oopHandle.hpp"
#include "utilities/concurrentHashTable.hpp"
#include "utilities/ostream.hpp"
class DictionaryEntry;
class ProtectionDomainEntry;
template <typename T> class GrowableArray;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// The data structure for the class loader data dictionaries.
class DictionaryEntry;
class Dictionary : public CHeapObj<mtClass> {
int _number_of_entries;
class Config {
public:
using Value = DictionaryEntry*;
static uintx get_hash(Value const& value, bool* is_dead);
static void* allocate_node(void* context, size_t size, Value const& value);
static void free_node(void* context, void* memory, Value const& value);
};
using ConcurrentTable = ConcurrentHashTable<Config, mtClass>;
ConcurrentTable* _table;
ClassLoaderData* _loader_data; // backpointer to owning loader
ClassLoaderData* loader_data() const { return _loader_data; }
DictionaryEntry* get_entry(Thread* current, Symbol* name);
bool check_if_needs_resize();
int table_size() const;
public:
Dictionary(ClassLoaderData* loader_data, size_t table_size);
~Dictionary();
void add_klass(JavaThread* current, Symbol* class_name, InstanceKlass* obj);
InstanceKlass* find_class(Thread* current, Symbol* name);
void classes_do(void f(InstanceKlass*));
void all_entries_do(KlassClosure* closure);
void classes_do(MetaspaceClosure* it);
void clean_cached_protection_domains(GrowableArray<ProtectionDomainEntry*>* delete_list);
// Protection domains
InstanceKlass* find(Thread* current, Symbol* name, Handle protection_domain);
void validate_protection_domain(InstanceKlass* klass,
Handle class_loader,
Handle protection_domain,
TRAPS);
void print_table_statistics(outputStream* st, const char* table_name);
void print_on(outputStream* st) const;
void print_size(outputStream* st) const;
void verify();
private:
bool is_valid_protection_domain(JavaThread* current, Symbol* name,
Handle protection_domain);
void add_protection_domain(JavaThread* current, InstanceKlass* klass,
Handle protection_domain);
};
// An entry in the class loader data dictionaries, this describes a class as
// { InstanceKlass*, protection_domain_set }.
class DictionaryEntry : public CHeapObj<mtClass> {
private:
// Contains the set of approved protection domains that can access
// this dictionary entry.
//
// [Note that C.protection_domain(), which is stored in the java.lang.Class
// mirror of C, is NOT the same as PD]
//
// If an entry for PD exists in the list, it means that
// it is okay for a caller class to reference the class in this dictionary entry.
//
// The usage of the PD set can be seen in SystemDictionary::validate_protection_domain()
// It is essentially a cache to avoid repeated Java up-calls to
// ClassLoader.checkPackageAccess().
//
InstanceKlass* _instance_klass;
ProtectionDomainEntry* volatile _pd_set;
public:
DictionaryEntry(InstanceKlass* instance_klass);
~DictionaryEntry();
// Tells whether a protection is in the approved set.
bool contains_protection_domain(oop protection_domain) const;
// Adds a protection domain to the approved set.
void add_protection_domain(ClassLoaderData* loader_data, Handle protection_domain);
InstanceKlass* instance_klass() const { return _instance_klass; }
InstanceKlass** instance_klass_addr() { return &_instance_klass; }
ProtectionDomainEntry* pd_set_acquire() const { return Atomic::load_acquire(&_pd_set); }
void release_set_pd_set(ProtectionDomainEntry* entry) { Atomic::release_store(&_pd_set, entry); }
// Tells whether the initiating class' protection domain can access the klass in this entry
inline bool is_valid_protection_domain(Handle protection_domain);
void verify_protection_domain_set();
void print_count(outputStream *st);
void verify();
};
#endif // SHARE_CLASSFILE_DICTIONARY_HPP
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