/*

 * 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

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 */

#include "precompiled.hpp"

#include "classfile/systemDictionary.hpp"

#include "gc_implementation/parallelScavenge/gcTaskManager.hpp"

#include "gc_implementation/parallelScavenge/objectStartArray.hpp"

#include "gc_implementation/parallelScavenge/parMarkBitMap.hpp"

#include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"

#include "gc_implementation/parallelScavenge/psOldGen.hpp"

#include "gc_implementation/parallelScavenge/psParallelCompact.hpp"

#include "oops/objArrayKlass.inline.hpp"

#include "oops/oop.inline.hpp"

#include "runtime/atomic.inline.hpp"

#include "utilities/stack.inline.hpp"

PSOldGen*            ParCompactionManager::_old_gen = NULL;

ParCompactionManager**  ParCompactionManager::_manager_array = NULL;

RegionTaskQueue**              ParCompactionManager::_region_list = NULL;

OopTaskQueueSet*     ParCompactionManager::_stack_array = NULL;

ParCompactionManager::ObjArrayTaskQueueSet*

  ParCompactionManager::_objarray_queues = NULL;

ObjectStartArray*    ParCompactionManager::_start_array = NULL;

ParMarkBitMap*       ParCompactionManager::_mark_bitmap = NULL;

RegionTaskQueueSet*  ParCompactionManager::_region_array = NULL;

uint*                 ParCompactionManager::_recycled_stack_index = NULL;

int                   ParCompactionManager::_recycled_top = -1;

int                   ParCompactionManager::_recycled_bottom = -1;

ParCompactionManager::ParCompactionManager() :

    _action(CopyAndUpdate),

    _region_stack(NULL),

    _region_stack_index((uint)max_uintx) {

  ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();

  assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");

  _old_gen = heap->old_gen();

  _start_array = old_gen()->start_array();

  marking_stack()->initialize();

  _objarray_stack.initialize();

}

ParCompactionManager::~ParCompactionManager() {

  delete _recycled_stack_index;

}

void ParCompactionManager::initialize(ParMarkBitMap* mbm) {

  assert(PSParallelCompact::gc_task_manager() != NULL,

    "Needed for initialization");

  _mark_bitmap = mbm;

  uint parallel_gc_threads = PSParallelCompact::gc_task_manager()->workers();

  assert(_manager_array == NULL, "Attempt to initialize twice");

  _manager_array = NEW_C_HEAP_ARRAY(ParCompactionManager*, parallel_gc_threads+1, mtGC);

  guarantee(_manager_array != NULL, "Could not allocate manager_array");

  _region_list = NEW_C_HEAP_ARRAY(RegionTaskQueue*,

                         parallel_gc_threads+1, mtGC);

  guarantee(_region_list != NULL, "Could not initialize promotion manager");

  _recycled_stack_index = NEW_C_HEAP_ARRAY(uint, parallel_gc_threads, mtGC);

  // parallel_gc-threads + 1 to be consistent with the number of

  // compaction managers.

  for(uint i=0; i<parallel_gc_threads + 1; i++) {

    _region_list[i] = new RegionTaskQueue();

    region_list(i)->initialize();

  }

  _stack_array = new OopTaskQueueSet(parallel_gc_threads);

  guarantee(_stack_array != NULL, "Could not allocate stack_array");

  _objarray_queues = new ObjArrayTaskQueueSet(parallel_gc_threads);

  guarantee(_objarray_queues != NULL, "Could not allocate objarray_queues");

  _region_array = new RegionTaskQueueSet(parallel_gc_threads);

  guarantee(_region_array != NULL, "Could not allocate region_array");

  // Create and register the ParCompactionManager(s) for the worker threads.

  for(uint i=0; i<parallel_gc_threads; i++) {

    _manager_array[i] = new ParCompactionManager();

    guarantee(_manager_array[i] != NULL, "Could not create ParCompactionManager");

    stack_array()->register_queue(i, _manager_array[i]->marking_stack());

    _objarray_queues->register_queue(i, &_manager_array[i]->_objarray_stack);

    region_array()->register_queue(i, region_list(i));

  }

  // The VMThread gets its own ParCompactionManager, which is not available

  // for work stealing.

  _manager_array[parallel_gc_threads] = new ParCompactionManager();

  guarantee(_manager_array[parallel_gc_threads] != NULL,

    "Could not create ParCompactionManager");

  assert(PSParallelCompact::gc_task_manager()->workers() != 0,

    "Not initialized?");

}

int ParCompactionManager::pop_recycled_stack_index() {

  assert(_recycled_bottom <= _recycled_top, "list is empty");

  // Get the next available index

  if (_recycled_bottom < _recycled_top) {

    uint cur, next, last;

    do {

      cur = _recycled_bottom;

      next = cur + 1;

      last = Atomic::cmpxchg(next, &_recycled_bottom, cur);

    } while (cur != last);

    return _recycled_stack_index[next];

  } else {

    return -1;

  }

}

void ParCompactionManager::push_recycled_stack_index(uint v) {

  // Get the next available index

  int cur = Atomic::add(1, &_recycled_top);

  _recycled_stack_index[cur] = v;

  assert(_recycled_bottom <= _recycled_top, "list top and bottom are wrong");

}

bool ParCompactionManager::should_update() {

  assert(action() != NotValid, "Action is not set");

  return (action() == ParCompactionManager::Update) ||

         (action() == ParCompactionManager::CopyAndUpdate) ||

         (action() == ParCompactionManager::UpdateAndCopy);

}

bool ParCompactionManager::should_copy() {

  assert(action() != NotValid, "Action is not set");

  return (action() == ParCompactionManager::Copy) ||

         (action() == ParCompactionManager::CopyAndUpdate) ||

         (action() == ParCompactionManager::UpdateAndCopy);

}

void ParCompactionManager::region_list_push(uint list_index,

                                            size_t region_index) {

  region_list(list_index)->push(region_index);

}

void ParCompactionManager::verify_region_list_empty(uint list_index) {

  assert(region_list(list_index)->is_empty(), "Not empty");

}

ParCompactionManager*

ParCompactionManager::gc_thread_compaction_manager(int index) {

  assert(index >= 0 && index < (int)ParallelGCThreads, "index out of range");

  assert(_manager_array != NULL, "Sanity");

  return _manager_array[index];

}

void ParCompactionManager::follow_marking_stacks() {

  do {

    // Drain the overflow stack first, to allow stealing from the marking stack.

    oop obj;

    while (marking_stack()->pop_overflow(obj)) {

    }

    while (marking_stack()->pop_local(obj)) {

    }

    // Process ObjArrays one at a time to avoid marking stack bloat.

    ObjArrayTask task;

    if (_objarray_stack.pop_overflow(task) || _objarray_stack.pop_local(task)) {

    }

  } while (!marking_stacks_empty());

  assert(marking_stacks_empty(), "Sanity");

}

void ParCompactionManager::drain_region_stacks() {

  do {

    // Drain overflow stack first so other threads can steal.

    size_t region_index;

    while (region_stack()->pop_overflow(region_index)) {

      PSParallelCompact::fill_and_update_region(this, region_index);

    }

    while (region_stack()->pop_local(region_index)) {

      PSParallelCompact::fill_and_update_region(this, region_index);

    }

  } while (!region_stack()->is_empty());

}