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/*
* Copyright (c) 2005, 2023, 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.
*
*/
#include "precompiled.hpp"
#include "classfile/resolutionErrors.hpp"
#include "memory/allocation.hpp"
#include "oops/constantPool.hpp"
#include "oops/instanceKlass.hpp"
#include "oops/klass.inline.hpp"
#include "oops/symbol.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/mutexLocker.hpp"
#include "utilities/resourceHash.hpp"
class ResolutionErrorKey {
ConstantPool* _cpool;
int _index;
public:
ResolutionErrorKey(ConstantPool* cpool, int index) : _cpool(cpool), _index(index) {
assert(_index > 0, "should be already encoded or otherwise greater than zero");
}
ConstantPool* cpool() const { return _cpool; }
static unsigned hash(const ResolutionErrorKey& key) {
Symbol* name = key._cpool->pool_holder()->name();
return (unsigned int)(name->identity_hash() ^ key._index);
}
static bool equals(const ResolutionErrorKey& l, const ResolutionErrorKey& r) {
return (l._cpool == r._cpool) && (l._index == r._index);
}
};
using InternalResolutionErrorTable = ResourceHashtable<ResolutionErrorKey, ResolutionErrorEntry*, 107, AnyObj::C_HEAP, mtClass,
ResolutionErrorKey::hash,
ResolutionErrorKey::equals>;
static InternalResolutionErrorTable* _resolution_error_table;
void ResolutionErrorTable::initialize() {
_resolution_error_table = new (mtClass) InternalResolutionErrorTable();
}
// create new error entry
void ResolutionErrorTable::add_entry(const constantPoolHandle& pool, int cp_index,
Symbol* error, Symbol* message,
Symbol* cause, Symbol* cause_msg)
{
assert_locked_or_safepoint(SystemDictionary_lock);
assert(!pool.is_null() && error != nullptr, "adding null obj");
ResolutionErrorKey key(pool(), cp_index);
ResolutionErrorEntry *entry = new ResolutionErrorEntry(error, message, cause, cause_msg);
_resolution_error_table->put(key, entry);
}
// create new nest host error entry
void ResolutionErrorTable::add_entry(const constantPoolHandle& pool, int cp_index,
const char* message)
{
assert_locked_or_safepoint(SystemDictionary_lock);
assert(!pool.is_null() && message != nullptr, "adding null obj");
ResolutionErrorKey key(pool(), cp_index);
ResolutionErrorEntry *entry = new ResolutionErrorEntry(message);
_resolution_error_table->put(key, entry);
}
// find entry in the table
ResolutionErrorEntry* ResolutionErrorTable::find_entry(const constantPoolHandle& pool, int cp_index) {
assert_locked_or_safepoint(SystemDictionary_lock);
ResolutionErrorKey key(pool(), cp_index);
ResolutionErrorEntry** entry = _resolution_error_table->get(key);
return entry == nullptr ? nullptr : *entry;
}
ResolutionErrorEntry::ResolutionErrorEntry(Symbol* error, Symbol* message,
Symbol* cause, Symbol* cause_msg):
_error(error),
_message(message),
_cause(cause),
_cause_msg(cause_msg),
_nest_host_error(nullptr) {
Symbol::maybe_increment_refcount(_error);
Symbol::maybe_increment_refcount(_message);
Symbol::maybe_increment_refcount(_cause);
Symbol::maybe_increment_refcount(_cause_msg);
}
ResolutionErrorEntry::~ResolutionErrorEntry() {
// decrement error refcount
Symbol::maybe_decrement_refcount(_error);
Symbol::maybe_decrement_refcount(_message);
Symbol::maybe_decrement_refcount(_cause);
Symbol::maybe_decrement_refcount(_cause_msg);
if (nest_host_error() != nullptr) {
FREE_C_HEAP_ARRAY(char, nest_host_error());
}
}
class ResolutionErrorDeleteIterate : StackObj {
ConstantPool* p;
public:
ResolutionErrorDeleteIterate(ConstantPool* pool):
p(pool) {};
bool do_entry(const ResolutionErrorKey& key, ResolutionErrorEntry* value){
if (key.cpool() == p) {
delete value;
return true;
} else {
return false;
}
}
};
// Delete entries in the table that match with ConstantPool c
void ResolutionErrorTable::delete_entry(ConstantPool* c) {
assert_locked_or_safepoint(SystemDictionary_lock);
ResolutionErrorDeleteIterate deleteIterator(c);
_resolution_error_table->unlink(&deleteIterator);
}
class ResolutionIteratePurgeErrors : StackObj {
public:
bool do_entry(const ResolutionErrorKey& key, ResolutionErrorEntry* value){
ConstantPool* pool = key.cpool();
if (!(pool->pool_holder()->is_loader_alive())) {
delete value;
return true;
} else {
return false;
}
}
};
// Remove unloaded entries from the table
void ResolutionErrorTable::purge_resolution_errors() {
assert_locked_or_safepoint(SystemDictionary_lock);
ResolutionIteratePurgeErrors purgeErrorsIterator;
_resolution_error_table->unlink(&purgeErrorsIterator);
}
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