/*

 * Copyright (c) 2000, 2015, 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/stringTable.hpp"

#include "classfile/systemDictionary.hpp"

#include "code/codeCache.hpp"

#include "gc_interface/collectedHeap.inline.hpp"

#include "memory/sharedHeap.hpp"

#include "oops/oop.inline.hpp"

#include "runtime/atomic.inline.hpp"

#include "runtime/fprofiler.hpp"

#include "runtime/java.hpp"

#include "utilities/copy.hpp"

#include "utilities/workgroup.hpp"

PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC

SharedHeap* SharedHeap::_sh;

SharedHeap::SharedHeap(CollectorPolicy* policy_) :

  CollectedHeap(),

  _collector_policy(policy_),

  _strong_roots_parity(0),

  _workers(NULL)

{

  _sh = this;  // ch is static, should be set only once.

  if (UseConcMarkSweepGC || UseG1GC) {

    _workers = new FlexibleWorkGang("GC Thread", ParallelGCThreads,

                            /* are_GC_task_threads */true,

                            /* are_ConcurrentGC_threads */false);

    if (_workers == NULL) {

      vm_exit_during_initialization("Failed necessary allocation.");

    } else {

      _workers->initialize_workers();

    }

  }

}

bool SharedHeap::heap_lock_held_for_gc() {

  Thread* t = Thread::current();

  return    Heap_lock->owned_by_self()

         || (   (t->is_GC_task_thread() ||  t->is_VM_thread())

             && _thread_holds_heap_lock_for_gc);

}

void SharedHeap::set_par_threads(uint t) {

  assert(t == 0 || !UseSerialGC, "Cannot have parallel threads");

  _n_par_threads = t;

}

void SharedHeap::change_strong_roots_parity() {

  // Also set the new collection parity.

  assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2,

         "Not in range.");

  _strong_roots_parity++;

  if (_strong_roots_parity == 3) _strong_roots_parity = 1;

  assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2,

         "Not in range.");

}

SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* heap, bool activate)

  : MarkScope(activate), _sh(heap)

{

  if (_active) {

    _sh->change_strong_roots_parity();

    // Zero the claimed high water mark in the StringTable

    StringTable::clear_parallel_claimed_index();

  }

}

void SharedHeap::set_barrier_set(BarrierSet* bs) {

  _barrier_set = bs;

  // Cached barrier set for fast access in oops

  oopDesc::set_bs(bs);

}

void SharedHeap::post_initialize() {

  CollectedHeap::post_initialize();

  ref_processing_init();

}

void SharedHeap::ref_processing_init() {}