jdk

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