/*

 * Copyright (c) 2003, 2017, 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/classLoaderData.inline.hpp"

#include "classfile/sharedClassUtil.hpp"

#include "classfile/dictionary.hpp"

#include "classfile/protectionDomainCache.hpp"

#include "classfile/systemDictionary.hpp"

#include "classfile/systemDictionaryShared.hpp"

#include "logging/log.hpp"

#include "logging/logStream.hpp"

#include "memory/iterator.hpp"

#include "memory/resourceArea.hpp"

#include "oops/oop.inline.hpp"

#include "runtime/orderAccess.inline.hpp"

#include "utilities/hashtable.inline.hpp"

size_t Dictionary::entry_size() {

  if (DumpSharedSpaces) {

    return SystemDictionaryShared::dictionary_entry_size();

  } else {

    return sizeof(DictionaryEntry);

  }

}

};

                       int number_of_entries)

};

}

  entry->set_pd_set(NULL);

  assert(klass->is_instance_klass(), "Must be");

  if (DumpSharedSpaces) {

    SystemDictionaryShared::init_shared_dictionary_entry(klass, entry);

  }

  return entry;

}

void Dictionary::free_entry(DictionaryEntry* entry) {

  // avoid recursion when deleting linked list

  while (entry->pd_set() != NULL) {

    ProtectionDomainEntry* to_delete = entry->pd_set();

    entry->set_pd_set(to_delete->next());

    delete to_delete;

  }

}

bool DictionaryEntry::contains_protection_domain(oop protection_domain) const {

#ifdef ASSERT

    // Ensure this doesn't show up in the pd_set (invariant)

    bool in_pd_set = false;

    for (ProtectionDomainEntry* current = _pd_set;

                                current != NULL;

                                current = current->next()) {

      if (current->protection_domain() == protection_domain) {

        in_pd_set = true;

        break;

      }

    }

    if (in_pd_set) {

      assert(false, "A klass's protection domain should not show up "

                    "in its sys. dict. PD set");

    }

  }

#endif /* ASSERT */

    // Succeeds trivially

    return true;

  }

  for (ProtectionDomainEntry* current = _pd_set;

                              current != NULL;

                              current = current->next()) {

    if (current->protection_domain() == protection_domain) return true;

  }

  return false;

}

void DictionaryEntry::add_protection_domain(Dictionary* dict, Handle protection_domain) {

  assert_locked_or_safepoint(SystemDictionary_lock);

  if (!contains_protection_domain(protection_domain())) {

    ProtectionDomainEntry* new_head =

                new ProtectionDomainEntry(entry, _pd_set);

    // Warning: Preserve store ordering.  The SystemDictionary is read

    //          without locks.  The new ProtectionDomainEntry must be

    //          complete before other threads can be allowed to see it

    //          via a store to _pd_set.

    OrderAccess::release_store_ptr(&_pd_set, new_head);

  }

  LogTarget(Trace, protectiondomain) lt;

  if (lt.is_enabled()) {

    LogStream ls(lt);

    print_count(&ls);

  }

}

void Dictionary::do_unloading() {

  assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");

  DictionaryEntry* probe = NULL;

  for (int index = 0; index < table_size(); index++) {

    for (DictionaryEntry** p = bucket_addr(index); *p != NULL; ) {

      probe = *p;

      }

      p = probe->next_addr();

    }

  }

}

void Dictionary::remove_classes_in_error_state() {

  assert(DumpSharedSpaces, "supported only when dumping");

  DictionaryEntry* probe = NULL;

  for (int index = 0; index < table_size(); index++) {

    for (DictionaryEntry** p = bucket_addr(index); *p != NULL; ) {

      probe = *p;

      if (ik->is_in_error_state()) { // purge this entry

        *p = probe->next();

        free_entry(probe);

        ResourceMark rm;

        tty->print_cr("Preload Warning: Removed error class: %s", ik->external_name());

        continue;

      }

      p = probe->next_addr();

    }

  }

}

//   Just the classes from defining class loaders

  for (int index = 0; index < table_size(); index++) {

    for (DictionaryEntry* probe = bucket(index);

                          probe != NULL;

                          probe = probe->next()) {

        f(k);

      }

    }

  }

}

// Added for initialize_itable_for_klass to handle exceptions

//   Just the classes from defining class loaders

  for (int index = 0; index < table_size(); index++) {

    for (DictionaryEntry* probe = bucket(index);

                          probe != NULL;

                          probe = probe->next()) {

        f(k, CHECK);

      }

    }

  }

}

  for (int index = 0; index < table_size(); index++) {

    for (DictionaryEntry* probe = bucket(index);

                          probe != NULL;

                          probe = probe->next()) {

    }

  }

}

// Readers of the SystemDictionary aren't always locked, so _buckets

// is volatile. The store of the next field in the constructor is

// also cast to volatile;  we do this to ensure store order is maintained

// by the compilers.

                           InstanceKlass* obj) {

  assert_locked_or_safepoint(SystemDictionary_lock);

  assert(obj != NULL, "adding NULL obj");

  assert(obj->name() == class_name, "sanity check on name");

  add_entry(index, entry);

}

//

// Since readers don't hold a lock, we must make sure that system

// dictionary entries are only removed at a safepoint (when only one

// thread is running), and are added to in a safe way (all links must

// be updated in an MT-safe manner).

//

// Callers should be aware that an entry could be added just after

// _buckets[index] is read here, so the caller will not see the new entry.

DictionaryEntry* Dictionary::get_entry(int index, unsigned int hash,

  for (DictionaryEntry* entry = bucket(index);

                        entry != NULL;

                        entry = entry->next()) {

    }

  }

  return NULL;

}

InstanceKlass* Dictionary::find(int index, unsigned int hash, Symbol* name,

  if (entry != NULL && entry->is_valid_protection_domain(protection_domain)) {

  } else {

    return NULL;

  }

}

InstanceKlass* Dictionary::find_class(int index, unsigned int hash,

  assert_locked_or_safepoint(SystemDictionary_lock);

}

// Variant of find_class for shared classes.  No locking required, as

// that table is static.

InstanceKlass* Dictionary::find_shared_class(int index, unsigned int hash,

                                             Symbol* name) {

}

void Dictionary::add_protection_domain(int index, unsigned int hash,

                                       InstanceKlass* klass,

                                       TRAPS) {

  Symbol*  klass_name = klass->name();

  assert(entry != NULL,"entry must be present, we just created it");

  assert(protection_domain() != NULL,

         "real protection domain should be present");

  entry->add_protection_domain(this, protection_domain);

  assert(entry->contains_protection_domain(protection_domain()),

         "now protection domain should be present");

}

bool Dictionary::is_valid_protection_domain(int index, unsigned int hash,

                                            Symbol* name,

                                            Handle protection_domain) {

  return entry->is_valid_protection_domain(protection_domain);

}

void Dictionary::reorder_dictionary() {

  // Copy all the dictionary entries into a single master list.

  DictionaryEntry* master_list = NULL;

  for (int i = 0; i < table_size(); ++i) {

    DictionaryEntry* p = bucket(i);

    while (p != NULL) {

      DictionaryEntry* tmp;

      tmp = p->next();

      p->set_next(master_list);

      master_list = p;

      p = tmp;

    }

    set_entry(i, NULL);

  }

  // Add the dictionary entries back to the list in the correct buckets.

  while (master_list != NULL) {

    DictionaryEntry* p = master_list;

    master_list = master_list->next();

    p->set_next(NULL);

    // Since the null class loader data isn't copied to the CDS archive,

    // compute the hash with NULL for loader data.

    int index = hash_to_index(hash);

    p->set_hash(hash);

    p->set_next(bucket(index));

    set_entry(index, p);

  }

}

SymbolPropertyTable::SymbolPropertyTable(int table_size)

  : Hashtable<Symbol*, mtSymbol>(table_size, sizeof(SymbolPropertyEntry))

{

}

SymbolPropertyTable::SymbolPropertyTable(int table_size, HashtableBucket<mtSymbol>* t,

                                         int number_of_entries)

  : Hashtable<Symbol*, mtSymbol>(table_size, sizeof(SymbolPropertyEntry), t, number_of_entries)

{

}

SymbolPropertyEntry* SymbolPropertyTable::find_entry(int index, unsigned int hash,

                                                     Symbol* sym,

                                                     intptr_t sym_mode) {

  assert(index == index_for(sym, sym_mode), "incorrect index?");

  for (SymbolPropertyEntry* p = bucket(index); p != NULL; p = p->next()) {

    if (p->hash() == hash && p->symbol() == sym && p->symbol_mode() == sym_mode) {

      return p;

    }

  }

  return NULL;

}

SymbolPropertyEntry* SymbolPropertyTable::add_entry(int index, unsigned int hash,

                                                    Symbol* sym, intptr_t sym_mode) {

  assert_locked_or_safepoint(SystemDictionary_lock);

  assert(index == index_for(sym, sym_mode), "incorrect index?");

  assert(find_entry(index, hash, sym, sym_mode) == NULL, "no double entry");

  SymbolPropertyEntry* p = new_entry(hash, sym, sym_mode);

  Hashtable<Symbol*, mtSymbol>::add_entry(index, p);

  return p;

}

void SymbolPropertyTable::oops_do(OopClosure* f) {

  for (int index = 0; index < table_size(); index++) {

    for (SymbolPropertyEntry* p = bucket(index); p != NULL; p = p->next()) {

      if (p->method_type() != NULL) {

        f->do_oop(p->method_type_addr());

      }

    }

  }

}

void SymbolPropertyTable::methods_do(void f(Method*)) {

  for (int index = 0; index < table_size(); index++) {

    for (SymbolPropertyEntry* p = bucket(index); p != NULL; p = p->next()) {

      Method* prop = p->method();

      if (prop != NULL) {

        f((Method*)prop);

      }

    }

  }

}

// ----------------------------------------------------------------------------

void Dictionary::print(bool details) {

  ResourceMark rm;

  if (details) {

                   table_size(), number_of_entries());

    tty->print_cr("^ indicates that initiating loader is different from "

                  "defining loader");

  }

  for (int index = 0; index < table_size(); index++) {

    for (DictionaryEntry* probe = bucket(index);

                          probe != NULL;

                          probe = probe->next()) {

      bool is_defining_class =

      if (details) {

        tty->print("%4d: ", index);

      }

      tty->print("%s%s", ((!details) || is_defining_class) ? " " : "^",

                 e->external_name());

      if (details) {

        tty->print(", loader ");

      }

      tty->cr();

    }

  }

  tty->cr();

}

void DictionaryEntry::verify() {

  ClassLoaderData* cld = loader_data();

  // class loader must be present;  a null class loader is the

  // boostrap loader

  guarantee(cld != NULL || DumpSharedSpaces ||

            cld->class_loader() == NULL ||

            cld->class_loader()->is_instance(),

            "checking type of class_loader");

}