duke@435: /*
coleenp@6316:  * Copyright (c) 2003, 2014, 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/dictionary.hpp"
stefank@2314: #include "classfile/systemDictionary.hpp"
tschatzl@5862: #include "memory/iterator.hpp"
stefank@2314: #include "oops/oop.inline.hpp"
stefank@2314: #include "prims/jvmtiRedefineClassesTrace.hpp"
goetz@6911: #include "runtime/orderAccess.inline.hpp"
stefank@2314: #include "utilities/hashtable.inline.hpp"
duke@435: 
drchase@6680: PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
duke@435: 
duke@435: DictionaryEntry*  Dictionary::_current_class_entry = NULL;
duke@435: int               Dictionary::_current_class_index =    0;
duke@435: 
duke@435: 
duke@435: Dictionary::Dictionary(int table_size)
coleenp@4037:   : TwoOopHashtable<Klass*, mtClass>(table_size, sizeof(DictionaryEntry)) {
duke@435:   _current_class_index = 0;
duke@435:   _current_class_entry = NULL;
tschatzl@5862:   _pd_cache_table = new ProtectionDomainCacheTable(defaultProtectionDomainCacheSize);
duke@435: };
duke@435: 
duke@435: 
zgu@3900: Dictionary::Dictionary(int table_size, HashtableBucket<mtClass>* t,
duke@435:                        int number_of_entries)
coleenp@4037:   : TwoOopHashtable<Klass*, mtClass>(table_size, sizeof(DictionaryEntry), t, number_of_entries) {
duke@435:   _current_class_index = 0;
duke@435:   _current_class_entry = NULL;
tschatzl@5862:   _pd_cache_table = new ProtectionDomainCacheTable(defaultProtectionDomainCacheSize);
duke@435: };
duke@435: 
tschatzl@5862: ProtectionDomainCacheEntry* Dictionary::cache_get(oop protection_domain) {
tschatzl@5862:   return _pd_cache_table->get(protection_domain);
tschatzl@5862: }
duke@435: 
coleenp@4037: DictionaryEntry* Dictionary::new_entry(unsigned int hash, Klass* klass,
coleenp@4037:                                        ClassLoaderData* loader_data) {
coleenp@4037:   DictionaryEntry* entry = (DictionaryEntry*)Hashtable<Klass*, mtClass>::new_entry(hash, klass);
coleenp@4037:   entry->set_loader_data(loader_data);
duke@435:   entry->set_pd_set(NULL);
coleenp@4037:   assert(klass->oop_is_instance(), "Must be");
duke@435:   return entry;
duke@435: }
duke@435: 
duke@435: 
duke@435: void Dictionary::free_entry(DictionaryEntry* entry) {
duke@435:   // avoid recursion when deleting linked list
duke@435:   while (entry->pd_set() != NULL) {
duke@435:     ProtectionDomainEntry* to_delete = entry->pd_set();
duke@435:     entry->set_pd_set(to_delete->next());
duke@435:     delete to_delete;
duke@435:   }
coleenp@4037:   Hashtable<Klass*, mtClass>::free_entry(entry);
duke@435: }
duke@435: 
duke@435: 
duke@435: bool DictionaryEntry::contains_protection_domain(oop protection_domain) const {
duke@435: #ifdef ASSERT
coleenp@4037:   if (protection_domain == InstanceKlass::cast(klass())->protection_domain()) {
duke@435:     // Ensure this doesn't show up in the pd_set (invariant)
duke@435:     bool in_pd_set = false;
duke@435:     for (ProtectionDomainEntry* current = _pd_set;
duke@435:                                 current != NULL;
duke@435:                                 current = current->next()) {
duke@435:       if (current->protection_domain() == protection_domain) {
duke@435:         in_pd_set = true;
duke@435:         break;
duke@435:       }
duke@435:     }
duke@435:     if (in_pd_set) {
duke@435:       assert(false, "A klass's protection domain should not show up "
duke@435:                     "in its sys. dict. PD set");
duke@435:     }
duke@435:   }
duke@435: #endif /* ASSERT */
duke@435: 
coleenp@4037:   if (protection_domain == InstanceKlass::cast(klass())->protection_domain()) {
duke@435:     // Succeeds trivially
duke@435:     return true;
duke@435:   }
duke@435: 
duke@435:   for (ProtectionDomainEntry* current = _pd_set;
duke@435:                               current != NULL;
duke@435:                               current = current->next()) {
duke@435:     if (current->protection_domain() == protection_domain) return true;
duke@435:   }
duke@435:   return false;
duke@435: }
duke@435: 
duke@435: 
tschatzl@5862: void DictionaryEntry::add_protection_domain(Dictionary* dict, oop protection_domain) {
duke@435:   assert_locked_or_safepoint(SystemDictionary_lock);
duke@435:   if (!contains_protection_domain(protection_domain)) {
tschatzl@5862:     ProtectionDomainCacheEntry* entry = dict->cache_get(protection_domain);
duke@435:     ProtectionDomainEntry* new_head =
tschatzl@5862:                 new ProtectionDomainEntry(entry, _pd_set);
duke@435:     // Warning: Preserve store ordering.  The SystemDictionary is read
duke@435:     //          without locks.  The new ProtectionDomainEntry must be
duke@435:     //          complete before other threads can be allowed to see it
duke@435:     //          via a store to _pd_set.
duke@435:     OrderAccess::release_store_ptr(&_pd_set, new_head);
duke@435:   }
duke@435:   if (TraceProtectionDomainVerification && WizardMode) {
duke@435:     print();
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
thartmann@7064: void Dictionary::do_unloading() {
jcoomes@1844:   assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
duke@435: 
duke@435:   // Remove unloadable entries and classes from system dictionary
duke@435:   // The placeholder array has been handled in always_strong_oops_do.
duke@435:   DictionaryEntry* probe = NULL;
thartmann@7064:   for (int index = 0; index < table_size(); index++) {
duke@435:     for (DictionaryEntry** p = bucket_addr(index); *p != NULL; ) {
duke@435:       probe = *p;
coleenp@4037:       Klass* e = probe->klass();
coleenp@4037:       ClassLoaderData* loader_data = probe->loader_data();
duke@435: 
coleenp@4037:       InstanceKlass* ik = InstanceKlass::cast(e);
duke@435: 
duke@435:       // Non-unloadable classes were handled in always_strong_oops_do
coleenp@4037:       if (!is_strongly_reachable(loader_data, e)) {
duke@435:         // Entry was not visited in phase1 (negated test from phase1)
coleenp@4037:         assert(!loader_data->is_the_null_class_loader_data(), "unloading entry with null class loader");
coleenp@4037:         ClassLoaderData* k_def_class_loader_data = ik->class_loader_data();
duke@435: 
duke@435:         // Do we need to delete this system dictionary entry?
duke@435:         bool purge_entry = false;
duke@435: 
duke@435:         // Do we need to delete this system dictionary entry?
coleenp@4037:         if (loader_data->is_unloading()) {
duke@435:           // If the loader is not live this entry should always be
thartmann@7064:           // removed (will never be looked up again).
duke@435:           purge_entry = true;
duke@435:         } else {
duke@435:           // The loader in this entry is alive. If the klass is dead,
coleenp@4037:           // (determined by checking the defining class loader)
duke@435:           // the loader must be an initiating loader (rather than the
duke@435:           // defining loader). Remove this entry.
coleenp@4037:           if (k_def_class_loader_data->is_unloading()) {
coleenp@4037:             // If we get here, the class_loader_data must not be the defining
duke@435:             // loader, it must be an initiating one.
coleenp@4037:             assert(k_def_class_loader_data != loader_data,
duke@435:                    "cannot have live defining loader and unreachable klass");
duke@435:             // Loader is live, but class and its defining loader are dead.
duke@435:             // Remove the entry. The class is going away.
duke@435:             purge_entry = true;
duke@435:           }
duke@435:         }
duke@435: 
duke@435:         if (purge_entry) {
duke@435:           *p = probe->next();
duke@435:           if (probe == _current_class_entry) {
duke@435:             _current_class_entry = NULL;
duke@435:           }
duke@435:           free_entry(probe);
duke@435:           continue;
duke@435:         }
duke@435:       }
duke@435:       p = probe->next_addr();
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
stefank@6992: void Dictionary::roots_oops_do(OopClosure* strong, OopClosure* weak) {
stefank@6992:   // Skip the strong roots probe marking if the closures are the same.
stefank@6992:   if (strong == weak) {
stefank@6992:     oops_do(strong);
stefank@6992:     return;
stefank@6992:   }
stefank@6992: 
stefank@6992:   for (int index = 0; index < table_size(); index++) {
stefank@6992:     for (DictionaryEntry *probe = bucket(index);
stefank@6992:                           probe != NULL;
stefank@6992:                           probe = probe->next()) {
stefank@6992:       Klass* e = probe->klass();
stefank@6992:       ClassLoaderData* loader_data = probe->loader_data();
stefank@6992:       if (is_strongly_reachable(loader_data, e)) {
stefank@6992:         probe->set_strongly_reachable();
stefank@6992:       }
stefank@6992:     }
stefank@6992:   }
stefank@6992:   _pd_cache_table->roots_oops_do(strong, weak);
stefank@6992: }
duke@435: 
coleenp@4037: void Dictionary::always_strong_oops_do(OopClosure* blk) {
tschatzl@5862:   // Follow all system classes and temporary placeholders in dictionary; only
tschatzl@5862:   // protection domain oops contain references into the heap. In a first
tschatzl@5862:   // pass over the system dictionary determine which need to be treated as
tschatzl@5862:   // strongly reachable and mark them as such.
duke@435:   for (int index = 0; index < table_size(); index++) {
duke@435:     for (DictionaryEntry *probe = bucket(index);
duke@435:                           probe != NULL;
duke@435:                           probe = probe->next()) {
coleenp@4037:       Klass* e = probe->klass();
coleenp@4037:       ClassLoaderData* loader_data = probe->loader_data();
coleenp@4037:       if (is_strongly_reachable(loader_data, e)) {
tschatzl@5862:         probe->set_strongly_reachable();
duke@435:       }
duke@435:     }
duke@435:   }
tschatzl@5862:   // Then iterate over the protection domain cache to apply the closure on the
tschatzl@5862:   // previously marked ones.
tschatzl@5862:   _pd_cache_table->always_strong_oops_do(blk);
duke@435: }
duke@435: 
duke@435: 
coleenp@4037: void Dictionary::always_strong_classes_do(KlassClosure* closure) {
coleenp@4037:   // Follow all system classes and temporary placeholders in dictionary
duke@435:   for (int index = 0; index < table_size(); index++) {
duke@435:     for (DictionaryEntry* probe = bucket(index);
duke@435:                           probe != NULL;
duke@435:                           probe = probe->next()) {
coleenp@4037:       Klass* e = probe->klass();
coleenp@4037:       ClassLoaderData* loader_data = probe->loader_data();
coleenp@4037:       if (is_strongly_reachable(loader_data, e)) {
coleenp@4037:         closure->do_klass(e);
coleenp@4037:       }
coleenp@4037:     }
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
coleenp@4037: 
coleenp@4037: //   Just the classes from defining class loaders
coleenp@4037: void Dictionary::classes_do(void f(Klass*)) {
coleenp@4037:   for (int index = 0; index < table_size(); index++) {
coleenp@4037:     for (DictionaryEntry* probe = bucket(index);
coleenp@4037:                           probe != NULL;
coleenp@4037:                           probe = probe->next()) {
coleenp@4037:       Klass* k = probe->klass();
coleenp@4037:       if (probe->loader_data() == InstanceKlass::cast(k)->class_loader_data()) {
duke@435:         f(k);
duke@435:       }
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: // Added for initialize_itable_for_klass to handle exceptions
duke@435: //   Just the classes from defining class loaders
coleenp@4037: void Dictionary::classes_do(void f(Klass*, TRAPS), TRAPS) {
duke@435:   for (int index = 0; index < table_size(); index++) {
duke@435:     for (DictionaryEntry* probe = bucket(index);
duke@435:                           probe != NULL;
duke@435:                           probe = probe->next()) {
coleenp@4037:       Klass* k = probe->klass();
coleenp@4037:       if (probe->loader_data() == InstanceKlass::cast(k)->class_loader_data()) {
duke@435:         f(k, CHECK);
duke@435:       }
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: //   All classes, and their class loaders
duke@435: // Don't iterate over placeholders
coleenp@4037: void Dictionary::classes_do(void f(Klass*, ClassLoaderData*)) {
duke@435:   for (int index = 0; index < table_size(); index++) {
duke@435:     for (DictionaryEntry* probe = bucket(index);
duke@435:                           probe != NULL;
duke@435:                           probe = probe->next()) {
coleenp@4037:       Klass* k = probe->klass();
coleenp@4037:       f(k, probe->loader_data());
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: void Dictionary::oops_do(OopClosure* f) {
tschatzl@5862:   // Only the protection domain oops contain references into the heap. Iterate
tschatzl@5862:   // over all of them.
tschatzl@5862:   _pd_cache_table->oops_do(f);
duke@435: }
duke@435: 
coleenp@4037: void Dictionary::methods_do(void f(Method*)) {
duke@435:   for (int index = 0; index < table_size(); index++) {
duke@435:     for (DictionaryEntry* probe = bucket(index);
duke@435:                           probe != NULL;
duke@435:                           probe = probe->next()) {
coleenp@4037:       Klass* k = probe->klass();
coleenp@4037:       if (probe->loader_data() == InstanceKlass::cast(k)->class_loader_data()) {
duke@435:         // only take klass is we have the entry with the defining class loader
coleenp@4037:         InstanceKlass::cast(k)->methods_do(f);
duke@435:       }
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
tschatzl@5862: void Dictionary::unlink(BoolObjectClosure* is_alive) {
tschatzl@5862:   // Only the protection domain cache table may contain references to the heap
tschatzl@5862:   // that need to be unlinked.
tschatzl@5862:   _pd_cache_table->unlink(is_alive);
tschatzl@5862: }
duke@435: 
coleenp@4037: Klass* Dictionary::try_get_next_class() {
duke@435:   while (true) {
duke@435:     if (_current_class_entry != NULL) {
coleenp@4037:       Klass* k = _current_class_entry->klass();
duke@435:       _current_class_entry = _current_class_entry->next();
duke@435:       return k;
duke@435:     }
duke@435:     _current_class_index = (_current_class_index + 1) % table_size();
duke@435:     _current_class_entry = bucket(_current_class_index);
duke@435:   }
duke@435:   // never reached
duke@435: }
duke@435: 
duke@435: // Add a loaded class to the system dictionary.
duke@435: // Readers of the SystemDictionary aren't always locked, so _buckets
duke@435: // is volatile. The store of the next field in the constructor is
duke@435: // also cast to volatile;  we do this to ensure store order is maintained
duke@435: // by the compilers.
duke@435: 
coleenp@4037: void Dictionary::add_klass(Symbol* class_name, ClassLoaderData* loader_data,
duke@435:                            KlassHandle obj) {
duke@435:   assert_locked_or_safepoint(SystemDictionary_lock);
duke@435:   assert(obj() != NULL, "adding NULL obj");
hseigel@4278:   assert(obj()->name() == class_name, "sanity check on name");
stefank@4667:   assert(loader_data != NULL, "Must be non-NULL");
duke@435: 
coleenp@4037:   unsigned int hash = compute_hash(class_name, loader_data);
duke@435:   int index = hash_to_index(hash);
coleenp@4037:   DictionaryEntry* entry = new_entry(hash, obj(), loader_data);
duke@435:   add_entry(index, entry);
duke@435: }
duke@435: 
duke@435: 
duke@435: // This routine does not lock the system dictionary.
duke@435: //
duke@435: // Since readers don't hold a lock, we must make sure that system
duke@435: // dictionary entries are only removed at a safepoint (when only one
duke@435: // thread is running), and are added to in a safe way (all links must
duke@435: // be updated in an MT-safe manner).
duke@435: //
duke@435: // Callers should be aware that an entry could be added just after
duke@435: // _buckets[index] is read here, so the caller will not see the new entry.
duke@435: DictionaryEntry* Dictionary::get_entry(int index, unsigned int hash,
coleenp@2497:                                        Symbol* class_name,
coleenp@4037:                                        ClassLoaderData* loader_data) {
duke@435:   debug_only(_lookup_count++);
duke@435:   for (DictionaryEntry* entry = bucket(index);
duke@435:                         entry != NULL;
duke@435:                         entry = entry->next()) {
coleenp@4037:     if (entry->hash() == hash && entry->equals(class_name, loader_data)) {
duke@435:       return entry;
duke@435:     }
duke@435:     debug_only(_lookup_length++);
duke@435:   }
duke@435:   return NULL;
duke@435: }
duke@435: 
duke@435: 
coleenp@4037: Klass* Dictionary::find(int index, unsigned int hash, Symbol* name,
coleenp@4037:                           ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
coleenp@4037:   DictionaryEntry* entry = get_entry(index, hash, name, loader_data);
duke@435:   if (entry != NULL && entry->is_valid_protection_domain(protection_domain)) {
duke@435:     return entry->klass();
duke@435:   } else {
duke@435:     return NULL;
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
coleenp@4037: Klass* Dictionary::find_class(int index, unsigned int hash,
coleenp@4037:                                 Symbol* name, ClassLoaderData* loader_data) {
duke@435:   assert_locked_or_safepoint(SystemDictionary_lock);
coleenp@4037:   assert (index == index_for(name, loader_data), "incorrect index?");
duke@435: 
coleenp@4037:   DictionaryEntry* entry = get_entry(index, hash, name, loader_data);
coleenp@4037:   return (entry != NULL) ? entry->klass() : (Klass*)NULL;
duke@435: }
duke@435: 
duke@435: 
duke@435: // Variant of find_class for shared classes.  No locking required, as
duke@435: // that table is static.
duke@435: 
coleenp@4037: Klass* Dictionary::find_shared_class(int index, unsigned int hash,
coleenp@2497:                                        Symbol* name) {
coleenp@4037:   assert (index == index_for(name, NULL), "incorrect index?");
duke@435: 
coleenp@4037:   DictionaryEntry* entry = get_entry(index, hash, name, NULL);
coleenp@4037:   return (entry != NULL) ? entry->klass() : (Klass*)NULL;
duke@435: }
duke@435: 
duke@435: 
duke@435: void Dictionary::add_protection_domain(int index, unsigned int hash,
duke@435:                                        instanceKlassHandle klass,
coleenp@4037:                                        ClassLoaderData* loader_data, Handle protection_domain,
duke@435:                                        TRAPS) {
coleenp@2497:   Symbol*  klass_name = klass->name();
coleenp@4037:   DictionaryEntry* entry = get_entry(index, hash, klass_name, loader_data);
duke@435: 
duke@435:   assert(entry != NULL,"entry must be present, we just created it");
duke@435:   assert(protection_domain() != NULL,
duke@435:          "real protection domain should be present");
duke@435: 
tschatzl@5862:   entry->add_protection_domain(this, protection_domain());
duke@435: 
duke@435:   assert(entry->contains_protection_domain(protection_domain()),
duke@435:          "now protection domain should be present");
duke@435: }
duke@435: 
duke@435: 
duke@435: bool Dictionary::is_valid_protection_domain(int index, unsigned int hash,
coleenp@2497:                                             Symbol* name,
coleenp@4037:                                             ClassLoaderData* loader_data,
duke@435:                                             Handle protection_domain) {
coleenp@4037:   DictionaryEntry* entry = get_entry(index, hash, name, loader_data);
duke@435:   return entry->is_valid_protection_domain(protection_domain);
duke@435: }
duke@435: 
duke@435: 
duke@435: void Dictionary::reorder_dictionary() {
duke@435: 
duke@435:   // Copy all the dictionary entries into a single master list.
duke@435: 
duke@435:   DictionaryEntry* master_list = NULL;
duke@435:   for (int i = 0; i < table_size(); ++i) {
duke@435:     DictionaryEntry* p = bucket(i);
duke@435:     while (p != NULL) {
duke@435:       DictionaryEntry* tmp;
duke@435:       tmp = p->next();
duke@435:       p->set_next(master_list);
duke@435:       master_list = p;
duke@435:       p = tmp;
duke@435:     }
duke@435:     set_entry(i, NULL);
duke@435:   }
duke@435: 
duke@435:   // Add the dictionary entries back to the list in the correct buckets.
duke@435:   while (master_list != NULL) {
duke@435:     DictionaryEntry* p = master_list;
duke@435:     master_list = master_list->next();
duke@435:     p->set_next(NULL);
coleenp@4037:     Symbol* class_name = InstanceKlass::cast((Klass*)(p->klass()))->name();
coleenp@4037:     // Since the null class loader data isn't copied to the CDS archive,
coleenp@4037:     // compute the hash with NULL for loader data.
coleenp@4037:     unsigned int hash = compute_hash(class_name, NULL);
duke@435:     int index = hash_to_index(hash);
duke@435:     p->set_hash(hash);
coleenp@4037:     p->set_loader_data(NULL);   // loader_data isn't copied to CDS
duke@435:     p->set_next(bucket(index));
duke@435:     set_entry(index, p);
duke@435:   }
duke@435: }
duke@435: 
tschatzl@5862: ProtectionDomainCacheTable::ProtectionDomainCacheTable(int table_size)
tschatzl@5862:   : Hashtable<oop, mtClass>(table_size, sizeof(ProtectionDomainCacheEntry))
tschatzl@5862: {
tschatzl@5862: }
tschatzl@5862: 
tschatzl@5862: void ProtectionDomainCacheTable::unlink(BoolObjectClosure* is_alive) {
tschatzl@5862:   assert(SafepointSynchronize::is_at_safepoint(), "must be");
tschatzl@5862:   for (int i = 0; i < table_size(); ++i) {
tschatzl@5862:     ProtectionDomainCacheEntry** p = bucket_addr(i);
tschatzl@5862:     ProtectionDomainCacheEntry* entry = bucket(i);
tschatzl@5862:     while (entry != NULL) {
tschatzl@5862:       if (is_alive->do_object_b(entry->literal())) {
tschatzl@5862:         p = entry->next_addr();
tschatzl@5862:       } else {
tschatzl@5862:         *p = entry->next();
tschatzl@5862:         free_entry(entry);
tschatzl@5862:       }
tschatzl@5862:       entry = *p;
tschatzl@5862:     }
tschatzl@5862:   }
tschatzl@5862: }
tschatzl@5862: 
tschatzl@5862: void ProtectionDomainCacheTable::oops_do(OopClosure* f) {
tschatzl@5862:   for (int index = 0; index < table_size(); index++) {
tschatzl@5862:     for (ProtectionDomainCacheEntry* probe = bucket(index);
tschatzl@5862:                                      probe != NULL;
tschatzl@5862:                                      probe = probe->next()) {
tschatzl@5862:       probe->oops_do(f);
tschatzl@5862:     }
tschatzl@5862:   }
tschatzl@5862: }
tschatzl@5862: 
stefank@6992: void ProtectionDomainCacheTable::roots_oops_do(OopClosure* strong, OopClosure* weak) {
stefank@6992:   for (int index = 0; index < table_size(); index++) {
stefank@6992:     for (ProtectionDomainCacheEntry* probe = bucket(index);
stefank@6992:                                      probe != NULL;
stefank@6992:                                      probe = probe->next()) {
stefank@6992:       if (probe->is_strongly_reachable()) {
stefank@6992:         probe->reset_strongly_reachable();
stefank@6992:         probe->oops_do(strong);
stefank@6992:       } else {
stefank@6992:         if (weak != NULL) {
stefank@6992:           probe->oops_do(weak);
stefank@6992:         }
stefank@6992:       }
stefank@6992:     }
stefank@6992:   }
stefank@6992: }
stefank@6992: 
tschatzl@5862: uint ProtectionDomainCacheTable::bucket_size() {
tschatzl@5862:   return sizeof(ProtectionDomainCacheEntry);
tschatzl@5862: }
tschatzl@5862: 
tschatzl@5862: #ifndef PRODUCT
tschatzl@5862: void ProtectionDomainCacheTable::print() {
tschatzl@5862:   tty->print_cr("Protection domain cache table (table_size=%d, classes=%d)",
tschatzl@5862:                 table_size(), number_of_entries());
tschatzl@5862:   for (int index = 0; index < table_size(); index++) {
tschatzl@5862:     for (ProtectionDomainCacheEntry* probe = bucket(index);
tschatzl@5862:                                      probe != NULL;
tschatzl@5862:                                      probe = probe->next()) {
tschatzl@5862:       probe->print();
tschatzl@5862:     }
tschatzl@5862:   }
tschatzl@5862: }
tschatzl@5862: 
tschatzl@5862: void ProtectionDomainCacheEntry::print() {
tschatzl@5862:   tty->print_cr("entry "PTR_FORMAT" value "PTR_FORMAT" strongly_reachable %d next "PTR_FORMAT,
jcoomes@5865:                 this, (void*)literal(), _strongly_reachable, next());
tschatzl@5862: }
tschatzl@5862: #endif
tschatzl@5862: 
tschatzl@5862: void ProtectionDomainCacheTable::verify() {
tschatzl@5862:   int element_count = 0;
tschatzl@5862:   for (int index = 0; index < table_size(); index++) {
tschatzl@5862:     for (ProtectionDomainCacheEntry* probe = bucket(index);
tschatzl@5862:                                      probe != NULL;
tschatzl@5862:                                      probe = probe->next()) {
tschatzl@5862:       probe->verify();
tschatzl@5862:       element_count++;
tschatzl@5862:     }
tschatzl@5862:   }
tschatzl@5862:   guarantee(number_of_entries() == element_count,
tschatzl@5862:             "Verify of protection domain cache table failed");
tschatzl@5862:   debug_only(verify_lookup_length((double)number_of_entries() / table_size()));
tschatzl@5862: }
tschatzl@5862: 
tschatzl@5862: void ProtectionDomainCacheEntry::verify() {
tschatzl@5862:   guarantee(literal()->is_oop(), "must be an oop");
tschatzl@5862: }
tschatzl@5862: 
tschatzl@5862: void ProtectionDomainCacheTable::always_strong_oops_do(OopClosure* f) {
tschatzl@5862:   // the caller marked the protection domain cache entries that we need to apply
tschatzl@5862:   // the closure on. Only process them.
tschatzl@5862:   for (int index = 0; index < table_size(); index++) {
tschatzl@5862:     for (ProtectionDomainCacheEntry* probe = bucket(index);
tschatzl@5862:                                      probe != NULL;
tschatzl@5862:                                      probe = probe->next()) {
tschatzl@5862:       if (probe->is_strongly_reachable()) {
tschatzl@5862:         probe->reset_strongly_reachable();
tschatzl@5862:         probe->oops_do(f);
tschatzl@5862:       }
tschatzl@5862:     }
tschatzl@5862:   }
tschatzl@5862: }
tschatzl@5862: 
tschatzl@5862: ProtectionDomainCacheEntry* ProtectionDomainCacheTable::get(oop protection_domain) {
tschatzl@5862:   unsigned int hash = compute_hash(protection_domain);
tschatzl@5862:   int index = hash_to_index(hash);
tschatzl@5862: 
tschatzl@5862:   ProtectionDomainCacheEntry* entry = find_entry(index, protection_domain);
tschatzl@5862:   if (entry == NULL) {
tschatzl@5862:     entry = add_entry(index, hash, protection_domain);
tschatzl@5862:   }
tschatzl@5862:   return entry;
tschatzl@5862: }
tschatzl@5862: 
tschatzl@5862: ProtectionDomainCacheEntry* ProtectionDomainCacheTable::find_entry(int index, oop protection_domain) {
tschatzl@5862:   for (ProtectionDomainCacheEntry* e = bucket(index); e != NULL; e = e->next()) {
tschatzl@5862:     if (e->protection_domain() == protection_domain) {
tschatzl@5862:       return e;
tschatzl@5862:     }
tschatzl@5862:   }
tschatzl@5862: 
tschatzl@5862:   return NULL;
tschatzl@5862: }
tschatzl@5862: 
tschatzl@5862: ProtectionDomainCacheEntry* ProtectionDomainCacheTable::add_entry(int index, unsigned int hash, oop protection_domain) {
tschatzl@5862:   assert_locked_or_safepoint(SystemDictionary_lock);
tschatzl@5862:   assert(index == index_for(protection_domain), "incorrect index?");
tschatzl@5862:   assert(find_entry(index, protection_domain) == NULL, "no double entry");
tschatzl@5862: 
tschatzl@5862:   ProtectionDomainCacheEntry* p = new_entry(hash, protection_domain);
tschatzl@5862:   Hashtable<oop, mtClass>::add_entry(index, p);
tschatzl@5862:   return p;
tschatzl@5862: }
tschatzl@5862: 
tschatzl@5862: void ProtectionDomainCacheTable::free(ProtectionDomainCacheEntry* to_delete) {
tschatzl@5862:   unsigned int hash = compute_hash(to_delete->protection_domain());
tschatzl@5862:   int index = hash_to_index(hash);
tschatzl@5862: 
tschatzl@5862:   ProtectionDomainCacheEntry** p = bucket_addr(index);
tschatzl@5862:   ProtectionDomainCacheEntry* entry = bucket(index);
tschatzl@5862:   while (true) {
tschatzl@5862:     assert(entry != NULL, "sanity");
tschatzl@5862: 
tschatzl@5862:     if (entry == to_delete) {
tschatzl@5862:       *p = entry->next();
tschatzl@5862:       Hashtable<oop, mtClass>::free_entry(entry);
tschatzl@5862:       break;
tschatzl@5862:     } else {
tschatzl@5862:       p = entry->next_addr();
tschatzl@5862:       entry = *p;
tschatzl@5862:     }
tschatzl@5862:   }
tschatzl@5862: }
tschatzl@5862: 
jrose@1145: SymbolPropertyTable::SymbolPropertyTable(int table_size)
zgu@3900:   : Hashtable<Symbol*, mtSymbol>(table_size, sizeof(SymbolPropertyEntry))
jrose@1145: {
jrose@1145: }
zgu@3900: SymbolPropertyTable::SymbolPropertyTable(int table_size, HashtableBucket<mtSymbol>* t,
jrose@1145:                                          int number_of_entries)
zgu@3900:   : Hashtable<Symbol*, mtSymbol>(table_size, sizeof(SymbolPropertyEntry), t, number_of_entries)
jrose@1145: {
jrose@1145: }
jrose@1145: 
jrose@1145: 
jrose@1145: SymbolPropertyEntry* SymbolPropertyTable::find_entry(int index, unsigned int hash,
coleenp@2497:                                                      Symbol* sym,
jrose@1862:                                                      intptr_t sym_mode) {
jrose@1862:   assert(index == index_for(sym, sym_mode), "incorrect index?");
jrose@1145:   for (SymbolPropertyEntry* p = bucket(index); p != NULL; p = p->next()) {
coleenp@2497:     if (p->hash() == hash && p->symbol() == sym && p->symbol_mode() == sym_mode) {
jrose@1145:       return p;
jrose@1145:     }
jrose@1145:   }
jrose@1145:   return NULL;
jrose@1145: }
jrose@1145: 
jrose@1145: 
jrose@1145: SymbolPropertyEntry* SymbolPropertyTable::add_entry(int index, unsigned int hash,
coleenp@2497:                                                     Symbol* sym, intptr_t sym_mode) {
jrose@1145:   assert_locked_or_safepoint(SystemDictionary_lock);
jrose@1862:   assert(index == index_for(sym, sym_mode), "incorrect index?");
jrose@1862:   assert(find_entry(index, hash, sym, sym_mode) == NULL, "no double entry");
jrose@1145: 
coleenp@2497:   SymbolPropertyEntry* p = new_entry(hash, sym, sym_mode);
zgu@3900:   Hashtable<Symbol*, mtSymbol>::add_entry(index, p);
jrose@1145:   return p;
jrose@1145: }
jrose@1145: 
jrose@1145: void SymbolPropertyTable::oops_do(OopClosure* f) {
jrose@1145:   for (int index = 0; index < table_size(); index++) {
jrose@1145:     for (SymbolPropertyEntry* p = bucket(index); p != NULL; p = p->next()) {
coleenp@4037:       if (p->method_type() != NULL) {
coleenp@4037:         f->do_oop(p->method_type_addr());
jrose@1145:       }
jrose@1145:     }
jrose@1145:   }
jrose@1145: }
jrose@1145: 
coleenp@4037: void SymbolPropertyTable::methods_do(void f(Method*)) {
jrose@1145:   for (int index = 0; index < table_size(); index++) {
jrose@1145:     for (SymbolPropertyEntry* p = bucket(index); p != NULL; p = p->next()) {
coleenp@4037:       Method* prop = p->method();
coleenp@4037:       if (prop != NULL) {
coleenp@4037:         f((Method*)prop);
jrose@1145:       }
jrose@1145:     }
jrose@1145:   }
jrose@1145: }
jrose@1145: 
duke@435: 
duke@435: // ----------------------------------------------------------------------------
duke@435: #ifndef PRODUCT
duke@435: 
duke@435: void Dictionary::print() {
duke@435:   ResourceMark rm;
duke@435:   HandleMark   hm;
duke@435: 
acorn@3491:   tty->print_cr("Java system dictionary (table_size=%d, classes=%d)",
acorn@3491:                  table_size(), number_of_entries());
duke@435:   tty->print_cr("^ indicates that initiating loader is different from "
duke@435:                 "defining loader");
duke@435: 
duke@435:   for (int index = 0; index < table_size(); index++) {
duke@435:     for (DictionaryEntry* probe = bucket(index);
duke@435:                           probe != NULL;
duke@435:                           probe = probe->next()) {
duke@435:       if (Verbose) tty->print("%4d: ", index);
coleenp@4037:       Klass* e = probe->klass();
coleenp@4037:       ClassLoaderData* loader_data =  probe->loader_data();
duke@435:       bool is_defining_class =
coleenp@4037:          (loader_data == InstanceKlass::cast(e)->class_loader_data());
duke@435:       tty->print("%s%s", is_defining_class ? " " : "^",
hseigel@4278:                    e->external_name());
coleenp@4037: 
duke@435:         tty->print(", loader ");
coleenp@4037:       loader_data->print_value();
duke@435:       tty->cr();
duke@435:     }
duke@435:   }
tschatzl@5862:   tty->cr();
tschatzl@5862:   _pd_cache_table->print();
tschatzl@5862:   tty->cr();
duke@435: }
duke@435: 
duke@435: #endif
duke@435: 
duke@435: void Dictionary::verify() {
duke@435:   guarantee(number_of_entries() >= 0, "Verify of system dictionary failed");
coleenp@4037: 
duke@435:   int element_count = 0;
duke@435:   for (int index = 0; index < table_size(); index++) {
duke@435:     for (DictionaryEntry* probe = bucket(index);
duke@435:                           probe != NULL;
duke@435:                           probe = probe->next()) {
coleenp@4037:       Klass* e = probe->klass();
coleenp@4037:       ClassLoaderData* loader_data = probe->loader_data();
hseigel@4278:       guarantee(e->oop_is_instance(),
duke@435:                               "Verify of system dictionary failed");
duke@435:       // class loader must be present;  a null class loader is the
duke@435:       // boostrap loader
coleenp@4037:       guarantee(loader_data != NULL || DumpSharedSpaces ||
coleenp@4304:                 loader_data->class_loader() == NULL ||
coleenp@4037:                 loader_data->class_loader()->is_instance(),
duke@435:                 "checking type of class_loader");
coleenp@6316:       e->verify();
duke@435:       probe->verify_protection_domain_set();
duke@435:       element_count++;
duke@435:     }
duke@435:   }
duke@435:   guarantee(number_of_entries() == element_count,
duke@435:             "Verify of system dictionary failed");
duke@435:   debug_only(verify_lookup_length((double)number_of_entries() / table_size()));
tschatzl@5862: 
tschatzl@5862:   _pd_cache_table->verify();
duke@435: }
coleenp@4037: