/*

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 * 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.

 *

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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/g1RemSet.inline.hpp"

#include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"

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

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

#include "utilities/taskqueue.hpp"

// Inline functions for G1CollectedHeap

// Return the region with the given index. It assumes the index is valid.

inline HeapRegion* G1CollectedHeap::region_at(uint index) const { return _hrs.at(index); }

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 void G1CollectedHeap::old_set_remove(HeapRegion* hr) {

  _old_set.remove(hr);

}

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);

  g1_barrier_set()->g1_mark_as_young(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);

}

// This is a fast test on whether a reference points into the

// collection set or not. Assume that the reference

// points into the heap.

inline bool G1CollectedHeap::in_cset_fast_test(oop obj) {

  // let's make sure the result is consistent with what the slower

  // test returns

  assert( ret || !obj_in_cs(obj), "sanity");

  assert(!ret ||  obj_in_cs(obj), "sanity");

  return ret;

}

#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

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

  HeapRegion* hr = heap_region_containing(obj);

  return hr != NULL && hr->is_young();

}

// We don't need barriers for initializing stores to objects

// in the young gen: for the SATB pre-barrier, there is no

// pre-value that needs to be remembered; for the remembered-set

// update logging post-barrier, we don't maintain remembered set

// information for young gen objects.

inline bool G1CollectedHeap::can_elide_initializing_store_barrier(oop new_obj) {

  return is_in_young(new_obj);

}

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

  const HeapRegion* hr = heap_region_containing(obj);

  if (hr == NULL) {

    if (obj == NULL) return false;

    else return true;

  }

  else return is_obj_dead(obj, hr);

}

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

  const HeapRegion* hr = heap_region_containing(obj);

  if (hr == NULL) {

    if (obj == NULL) return false;

    else return true;

  }

  else return is_obj_ill(obj, hr);

}

template <class T> inline void G1ParScanThreadState::immediate_rs_update(HeapRegion* from, T* p, int tid) {

  if (!from->is_survivor()) {

    _g1_rem->par_write_ref(from, p, tid);

  }

}

template <class T> void G1ParScanThreadState::update_rs(HeapRegion* from, T* p, int tid) {

  if (G1DeferredRSUpdate) {

    deferred_rs_update(from, p, tid);

  } else {

    immediate_rs_update(from, p, tid);

  }

}

inline void G1ParScanThreadState::do_oop_partial_array(oop* p) {

  assert(has_partial_array_mask(p), "invariant");

  oop from_obj = clear_partial_array_mask(p);

  assert(Universe::heap()->is_in_reserved(from_obj), "must be in heap.");

  assert(from_obj->is_objArray(), "must be obj array");

  objArrayOop from_obj_array = objArrayOop(from_obj);

  // The from-space object contains the real length.

  int length                 = from_obj_array->length();

  assert(from_obj->is_forwarded(), "must be forwarded");

  oop to_obj                 = from_obj->forwardee();

  assert(from_obj != to_obj, "should not be chunking self-forwarded objects");

  objArrayOop to_obj_array   = objArrayOop(to_obj);

  // We keep track of the next start index in the length field of the

  // to-space object.

  int next_index             = to_obj_array->length();

  assert(0 <= next_index && next_index < length,

         err_msg("invariant, next index: %d, length: %d", next_index, length));

  int start                  = next_index;

  int end                    = length;

  int remainder              = end - start;

  // We'll try not to push a range that's smaller than ParGCArrayScanChunk.

  if (remainder > 2 * ParGCArrayScanChunk) {

    end = start + ParGCArrayScanChunk;

    to_obj_array->set_length(end);

    // Push the remainder before we process the range in case another

    // worker has run out of things to do and can steal it.

    oop* from_obj_p = set_partial_array_mask(from_obj);

    push_on_queue(from_obj_p);

  } else {

    assert(length == end, "sanity");

    // We'll process the final range for this object. Restore the length

    // so that the heap remains parsable in case of evacuation failure.

    to_obj_array->set_length(end);

  }

  _scanner.set_region(_g1h->heap_region_containing_raw(to_obj));

  // Process indexes [start,end). It will also process the header

  // along with the first chunk (i.e., the chunk with start == 0).

  // Note that at this point the length field of to_obj_array is not

  // correct given that we are using it to keep track of the next

  // start index. oop_iterate_range() (thankfully!) ignores the length

  // field and only relies on the start / end parameters.  It does

  // however return the size of the object which will be incorrect. So

  // we have to ignore it even if we wanted to use it.

  to_obj_array->oop_iterate_range(&_scanner, start, end);

}

template <class T> inline void G1ParScanThreadState::deal_with_reference(T* ref_to_scan) {

  if (!has_partial_array_mask(ref_to_scan)) {

    // Note: we can use "raw" versions of "region_containing" because

    // "obj_to_scan" is definitely in the heap, and is not in a

    // humongous region.

    HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan);

    do_oop_evac(ref_to_scan, r);

  } else {

    do_oop_partial_array((oop*)ref_to_scan);

  }

}

inline void G1ParScanThreadState::deal_with_reference(StarTask ref) {

  assert(verify_task(ref), "sanity");

  if (ref.is_narrow()) {

    deal_with_reference((narrowOop*)ref);

  } else {

    deal_with_reference((oop*)ref);

  }

}

#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP