/*

 * Copyright (c) 2001, 2012, 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

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 */

#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP

#define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP

#include "gc_implementation/g1/concurrentMark.hpp"

#include "gc_implementation/g1/g1CollectedHeap.hpp"

#include "gc_implementation/g1/g1AllocRegion.inline.hpp"

#include "gc_implementation/g1/g1CollectorPolicy.hpp"

#include "gc_implementation/g1/heapRegionSeq.inline.hpp"

#include "utilities/taskqueue.hpp"

// Inline functions for G1CollectedHeap

template <class T>

inline HeapRegion*

G1CollectedHeap::heap_region_containing(const T addr) const {

  HeapRegion* hr = _hrs.addr_to_region((HeapWord*) addr);

  // hr can be null if addr in perm_gen

  if (hr != NULL && hr->continuesHumongous()) {

    hr = hr->humongous_start_region();

  }

  return hr;

}

template <class T>

inline HeapRegion*

G1CollectedHeap::heap_region_containing_raw(const T addr) const {

  assert(_g1_reserved.contains((const void*) addr), "invariant");

  HeapRegion* res = _hrs.addr_to_region_unsafe((HeapWord*) addr);

  return res;

}

inline bool G1CollectedHeap::obj_in_cs(oop obj) {

  HeapRegion* r = _hrs.addr_to_region((HeapWord*) obj);

  return r != NULL && r->in_collection_set();

}

inline HeapWord*

G1CollectedHeap::attempt_allocation(size_t word_size,

                                    unsigned int* gc_count_before_ret,

                                    int* gclocker_retry_count_ret) {

  assert_heap_not_locked_and_not_at_safepoint();

  assert(!isHumongous(word_size), "attempt_allocation() should not "

         "be called for humongous allocation requests");

  HeapWord* result = _mutator_alloc_region.attempt_allocation(word_size,

                                                      false /* bot_updates */);

  if (result == NULL) {

    result = attempt_allocation_slow(word_size,

                                     gc_count_before_ret,

                                     gclocker_retry_count_ret);

  }

  assert_heap_not_locked();

  if (result != NULL) {

    dirty_young_block(result, word_size);

  }

  return result;

}

inline HeapWord* G1CollectedHeap::survivor_attempt_allocation(size_t

                                                              word_size) {

  assert(!isHumongous(word_size),

         "we should not be seeing humongous-size allocations in this path");

  HeapWord* result = _survivor_gc_alloc_region.attempt_allocation(word_size,

                                                      false /* bot_updates */);

  if (result == NULL) {

    MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);

    result = _survivor_gc_alloc_region.attempt_allocation_locked(word_size,

                                                      false /* bot_updates */);

  }

  if (result != NULL) {

    dirty_young_block(result, word_size);

  }

  return result;

}

inline HeapWord* G1CollectedHeap::old_attempt_allocation(size_t word_size) {

  assert(!isHumongous(word_size),

         "we should not be seeing humongous-size allocations in this path");

  HeapWord* result = _old_gc_alloc_region.attempt_allocation(word_size,

                                                       true /* bot_updates */);

  if (result == NULL) {

    MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);

    result = _old_gc_alloc_region.attempt_allocation_locked(word_size,

                                                       true /* bot_updates */);

  }

  return result;

}

// It dirties the cards that cover the block so that so that the post

// write barrier never queues anything when updating objects on this

// block. It is assumed (and in fact we assert) that the block

// belongs to a young region.

inline void

G1CollectedHeap::dirty_young_block(HeapWord* start, size_t word_size) {

  assert_heap_not_locked();

  // Assign the containing region to containing_hr so that we don't

  // have to keep calling heap_region_containing_raw() in the

  // asserts below.

  DEBUG_ONLY(HeapRegion* containing_hr = heap_region_containing_raw(start);)

  assert(containing_hr != NULL && start != NULL && word_size > 0,

         "pre-condition");

  assert(containing_hr->is_in(start), "it should contain start");

  assert(containing_hr->is_young(), "it should be young");

  assert(!containing_hr->isHumongous(), "it should not be humongous");

  HeapWord* end = start + word_size;

  assert(containing_hr->is_in(end - 1), "it should also contain end - 1");

  MemRegion mr(start, end);

  ((CardTableModRefBS*)_g1h->barrier_set())->dirty(mr);

}

inline RefToScanQueue* G1CollectedHeap::task_queue(int i) const {

  return _task_queues->queue(i);

}

inline bool G1CollectedHeap::isMarkedPrev(oop obj) const {

  return _cm->prevMarkBitMap()->isMarked((HeapWord *)obj);

}

inline bool G1CollectedHeap::isMarkedNext(oop obj) const {

  return _cm->nextMarkBitMap()->isMarked((HeapWord *)obj);

}

#ifndef PRODUCT

// Support for G1EvacuationFailureALot

inline bool

G1CollectedHeap::evacuation_failure_alot_for_gc_type(bool gcs_are_young,

                                                     bool during_initial_mark,

                                                     bool during_marking) {

  bool res = false;

  if (during_marking) {

    res |= G1EvacuationFailureALotDuringConcMark;

  }

  if (during_initial_mark) {

    res |= G1EvacuationFailureALotDuringInitialMark;

  }

  if (gcs_are_young) {

    res |= G1EvacuationFailureALotDuringYoungGC;

  } else {

    // GCs are mixed

    res |= G1EvacuationFailureALotDuringMixedGC;

  }

  return res;

}

inline void

G1CollectedHeap::set_evacuation_failure_alot_for_current_gc() {

  if (G1EvacuationFailureALot) {

    // Note we can't assert that _evacuation_failure_alot_for_current_gc

    // is clear here. It may have been set during a previous GC but that GC

    // did not copy enough objects (i.e. G1EvacuationFailureALotCount) to

    // trigger an evacuation failure and clear the flags and and counts.

    // Check if we have gone over the interval.

    const size_t gc_num = total_collections();

    const size_t elapsed_gcs = gc_num - _evacuation_failure_alot_gc_number;

    _evacuation_failure_alot_for_current_gc = (elapsed_gcs >= G1EvacuationFailureALotInterval);

    // Now check if G1EvacuationFailureALot is enabled for the current GC type.

    const bool gcs_are_young = g1_policy()->gcs_are_young();

    const bool during_im = g1_policy()->during_initial_mark_pause();

    const bool during_marking = mark_in_progress();

    _evacuation_failure_alot_for_current_gc &=

      evacuation_failure_alot_for_gc_type(gcs_are_young,

                                          during_im,

                                          during_marking);

  }

}

inline bool

G1CollectedHeap::evacuation_should_fail() {

  if (!G1EvacuationFailureALot || !_evacuation_failure_alot_for_current_gc) {

    return false;

  }

  // G1EvacuationFailureALot is in effect for current GC

  // Access to _evacuation_failure_alot_count is not atomic;

  // the value does not have to be exact.

  if (++_evacuation_failure_alot_count < G1EvacuationFailureALotCount) {

    return false;

  }

  _evacuation_failure_alot_count = 0;

  return true;

}

inline void G1CollectedHeap::reset_evacuation_should_fail() {

  if (G1EvacuationFailureALot) {

    _evacuation_failure_alot_gc_number = total_collections();

    _evacuation_failure_alot_count = 0;

    _evacuation_failure_alot_for_current_gc = false;

  }

}

#endif  // #ifndef PRODUCT

#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP