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 /*

  * Copyright (c) 2014, 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_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;

   size_t            _alloc_buffer_waste;

   size_t            _undo_waste;

   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))

   void   add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; }

   void   add_to_undo_waste(size_t waste)         { _undo_waste += waste; }

   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) {

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

     _refs->push(ref);

   }

   template <class T> void update_rs(HeapRegion* from, T* p, int 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