duke@435: /*
trims@2708:  * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #include "precompiled.hpp"
stefank@2314: #include "classfile/resolutionErrors.hpp"
stefank@2314: #include "memory/resourceArea.hpp"
stefank@2314: #include "oops/oop.inline.hpp"
stefank@2314: #include "runtime/handles.inline.hpp"
stefank@2314: #include "runtime/safepoint.hpp"
stefank@2314: #include "utilities/hashtable.inline.hpp"
duke@435: 
duke@435: // add new entry to the table
duke@435: void ResolutionErrorTable::add_entry(int index, unsigned int hash,
coleenp@2497:                                      constantPoolHandle pool, int cp_index, Symbol* error)
duke@435: {
duke@435:   assert_locked_or_safepoint(SystemDictionary_lock);
coleenp@2497:   assert(!pool.is_null() && error != NULL, "adding NULL obj");
duke@435: 
coleenp@2497:   ResolutionErrorEntry* entry = new_entry(hash, pool(), cp_index, error);
duke@435:   add_entry(index, entry);
duke@435: }
duke@435: 
duke@435: // find entry in the table
duke@435: ResolutionErrorEntry* ResolutionErrorTable::find_entry(int index, unsigned int hash,
duke@435:                                                        constantPoolHandle pool, int cp_index)
duke@435: {
duke@435:   assert_locked_or_safepoint(SystemDictionary_lock);
duke@435: 
duke@435:   for (ResolutionErrorEntry *error_probe = bucket(index);
duke@435:                          error_probe != NULL;
duke@435:                          error_probe = error_probe->next()) {
duke@435:   if (error_probe->hash() == hash && error_probe->pool() == pool()) {
duke@435:       return error_probe;;
duke@435:     }
duke@435:   }
duke@435:   return NULL;
duke@435: }
duke@435: 
coleenp@2497: void ResolutionErrorEntry::set_error(Symbol* e) {
coleenp@2497:   assert(e == NULL || _error == NULL, "cannot reset error");
coleenp@2497:   _error = e;
coleenp@2497:   if (_error != NULL) _error->increment_refcount();
coleenp@2497: }
coleenp@2497: 
duke@435: // create new error entry
duke@435: ResolutionErrorEntry* ResolutionErrorTable::new_entry(int hash, constantPoolOop pool,
coleenp@2497:                                                       int cp_index, Symbol* error)
duke@435: {
coleenp@2497:   ResolutionErrorEntry* entry = (ResolutionErrorEntry*)Hashtable<constantPoolOop>::new_entry(hash, pool);
duke@435:   entry->set_cp_index(cp_index);
coleenp@2497:   NOT_PRODUCT(entry->set_error(NULL);)
duke@435:   entry->set_error(error);
duke@435: 
duke@435:   return entry;
duke@435: }
duke@435: 
coleenp@2497: void ResolutionErrorTable::free_entry(ResolutionErrorEntry *entry) {
coleenp@2497:   // decrement error refcount
coleenp@2497:   assert(entry->error() != NULL, "error should be set");
coleenp@2497:   entry->error()->decrement_refcount();
coleenp@2497:   Hashtable<constantPoolOop>::free_entry(entry);
coleenp@2497: }
coleenp@2497: 
coleenp@2497: 
duke@435: // create resolution error table
duke@435: ResolutionErrorTable::ResolutionErrorTable(int table_size)
coleenp@2497:     : Hashtable<constantPoolOop>(table_size, sizeof(ResolutionErrorEntry)) {
duke@435: }
duke@435: 
duke@435: // GC support
duke@435: void ResolutionErrorTable::oops_do(OopClosure* f) {
duke@435:   for (int i = 0; i < table_size(); i++) {
duke@435:     for (ResolutionErrorEntry* probe = bucket(i);
duke@435:                            probe != NULL;
duke@435:                            probe = probe->next()) {
duke@435:       assert(probe->pool() != (constantPoolOop)NULL, "resolution error table is corrupt");
coleenp@2497:       assert(probe->error() != (Symbol*)NULL, "resolution error table is corrupt");
duke@435:       probe->oops_do(f);
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: // GC support
duke@435: void ResolutionErrorEntry::oops_do(OopClosure* blk) {
duke@435:   blk->do_oop((oop*)pool_addr());
duke@435: }
duke@435: 
duke@435: // Remove unloaded entries from the table
duke@435: void ResolutionErrorTable::purge_resolution_errors(BoolObjectClosure* is_alive) {
jcoomes@1844:   assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
duke@435:   for (int i = 0; i < table_size(); i++) {
duke@435:     for (ResolutionErrorEntry** p = bucket_addr(i); *p != NULL; ) {
duke@435:       ResolutionErrorEntry* entry = *p;
duke@435:       assert(entry->pool() != (constantPoolOop)NULL, "resolution error table is corrupt");
duke@435:       constantPoolOop pool = entry->pool();
duke@435:       if (is_alive->do_object_b(pool)) {
duke@435:         p = entry->next_addr();
duke@435:       } else {
duke@435:         *p = entry->next();
duke@435:         free_entry(entry);
duke@435:       }
duke@435:     }
duke@435:   }
duke@435: }