/*

 * Copyright (c) 2014, 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

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 */

#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1PARSCANTHREADSTATE_HPP

#define SHARE_VM_GC_IMPLEMENTATION_G1_G1PARSCANTHREADSTATE_HPP

#include "gc_implementation/g1/dirtyCardQueue.hpp"

#include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"

#include "gc_implementation/g1/g1CollectedHeap.hpp"

#include "gc_implementation/g1/g1CollectorPolicy.hpp"

#include "gc_implementation/g1/g1OopClosures.hpp"

#include "gc_implementation/g1/g1RemSet.hpp"

#include "gc_implementation/shared/ageTable.hpp"

#include "memory/allocation.hpp"

#include "oops/oop.hpp"

class HeapRegion;

class outputStream;

class G1ParScanThreadState : public StackObj {

 private:

  G1CollectedHeap* _g1h;

  RefToScanQueue*  _refs;

  DirtyCardQueue   _dcq;

  G1SATBCardTableModRefBS* _ct_bs;

  G1RemSet* _g1_rem;

  G1ParGCAllocator* _g1_par_allocator;

  ageTable          _age_table;

  InCSetState       _dest[InCSetState::Num];

  // Local tenuring threshold.

  uint              _tenuring_threshold;

  G1ParScanClosure  _scanner;

  OopsInHeapRegionClosure*      _evac_failure_cl;

  int  _hash_seed;

  uint _queue_num;

  size_t _term_attempts;

  double _start;

  double _start_strong_roots;

  double _strong_roots_time;

  double _start_term;

  double _term_time;

  // Map from young-age-index (0 == not young, 1 is youngest) to

  // surviving words. base is what we get back from the malloc call

  size_t* _surviving_young_words_base;

  // this points into the array, as we use the first few entries for padding

  size_t* _surviving_young_words;

#define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t))

  DirtyCardQueue& dirty_card_queue()             { return _dcq;  }

  G1SATBCardTableModRefBS* ctbs()                { return _ct_bs; }

  InCSetState dest(InCSetState original) const {

    assert(original.is_valid(),

           err_msg("Original state invalid: " CSETSTATE_FORMAT, original.value()));

    assert(_dest[original.value()].is_valid_gen(),

           err_msg("Dest state is invalid: " CSETSTATE_FORMAT, _dest[original.value()].value()));

    return _dest[original.value()];

  }

 public:

  G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num, ReferenceProcessor* rp);

  ~G1ParScanThreadState();

  ageTable*         age_table()       { return &_age_table;       }

#ifdef ASSERT

  bool queue_is_empty() const { return _refs->is_empty(); }

  bool verify_ref(narrowOop* ref) const;

  bool verify_ref(oop* ref) const;

  bool verify_task(StarTask ref) const;

#endif // ASSERT

  template <class T> void push_on_queue(T* ref);

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

    // If the new value of the field points to the same region or

    // is the to-space, we don't need to include it in the Rset updates.

    if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) {

      size_t card_index = ctbs()->index_for(p);

      // If the card hasn't been added to the buffer, do it.

      if (ctbs()->mark_card_deferred(card_index)) {

        dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index));

      }

    }

  }

  void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) {

    _evac_failure_cl = evac_failure_cl;

  }

  OopsInHeapRegionClosure* evac_failure_closure() { return _evac_failure_cl; }

  int* hash_seed() { return &_hash_seed; }

  uint queue_num() { return _queue_num; }

  size_t term_attempts() const  { return _term_attempts; }

  void note_term_attempt() { _term_attempts++; }

  void start_strong_roots() {

    _start_strong_roots = os::elapsedTime();

  }

  void end_strong_roots() {

    _strong_roots_time += (os::elapsedTime() - _start_strong_roots);

  }

  double strong_roots_time() const { return _strong_roots_time; }

  void start_term_time() {

    note_term_attempt();

    _start_term = os::elapsedTime();

  }

  void end_term_time() {

    _term_time += (os::elapsedTime() - _start_term);

  }

  double term_time() const { return _term_time; }

  double elapsed_time() const {

    return os::elapsedTime() - _start;

  }

  static void print_termination_stats_hdr(outputStream* const st = gclog_or_tty);

  void print_termination_stats(int i, outputStream* const st = gclog_or_tty) const;

  size_t* surviving_young_words() {

    // We add on to hide entry 0 which accumulates surviving words for

    // age -1 regions (i.e. non-young ones)

    return _surviving_young_words;

  }

 private:

  #define G1_PARTIAL_ARRAY_MASK 0x2

  inline bool has_partial_array_mask(oop* ref) const {

    return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;

  }

  // We never encode partial array oops as narrowOop*, so return false immediately.

  // This allows the compiler to create optimized code when popping references from

  // the work queue.

  inline bool has_partial_array_mask(narrowOop* ref) const {

    assert(((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) != G1_PARTIAL_ARRAY_MASK, "Partial array oop reference encoded as narrowOop*");

    return false;

  }

  // Only implement set_partial_array_mask() for regular oops, not for narrowOops.

  // We always encode partial arrays as regular oop, to allow the

  // specialization for has_partial_array_mask() for narrowOops above.

  // This means that unintentional use of this method with narrowOops are caught

  // by the compiler.

  inline oop* set_partial_array_mask(oop obj) const {

    assert(((uintptr_t)(void *)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");

    return (oop*) ((uintptr_t)(void *)obj | G1_PARTIAL_ARRAY_MASK);

  }

  inline oop clear_partial_array_mask(oop* ref) const {

    return cast_to_oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK);

  }

  inline void do_oop_partial_array(oop* p);

  // This method is applied to the fields of the objects that have just been copied.

  template <class T> inline void do_oop_evac(T* p, HeapRegion* from);

  template <class T> inline void deal_with_reference(T* ref_to_scan);

  inline void dispatch_reference(StarTask ref);

  // Tries to allocate word_sz in the PLAB of the next "generation" after trying to

  // allocate into dest. State is the original (source) cset state for the object

  // that is allocated for.

  // Returns a non-NULL pointer if successful, and updates dest if required.

  HeapWord* allocate_in_next_plab(InCSetState const state,

                                  InCSetState* dest,

                                  size_t word_sz,

                                  AllocationContext_t const context);

  inline InCSetState next_state(InCSetState const state, markOop const m, uint& age);

 public:

  oop copy_to_survivor_space(InCSetState const state, oop const obj, markOop const old_mark);

  void trim_queue();

  inline void steal_and_trim_queue(RefToScanQueueSet *task_queues);

};

#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1PARSCANTHREADSTATE_HPP