jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp@d35872270666 (annotated)

src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp@d35872270666 (annotated)

src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp

Tue, 09 Sep 2014 00:05:25 +0200

author: sjohanss
date: Tue, 09 Sep 2014 00:05:25 +0200
changeset 7131: d35872270666
parent 7051: 1f1d373cd044
child 7195: c02ec279b062
permissions: -rw-r--r--

8057658: Enable G1 FullGC extensions
Summary: Refactored the G1 FullGC code to enable it to be extended.
Reviewed-by: mgerdin, brutisso

 /*
  * Copyright (c) 2001, 2013, 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.
  *
  */
 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP
 #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp"
 #include "memory/cardTableModRefBS.hpp"
 #include "memory/memRegion.hpp"
 #include "oops/oop.inline.hpp"
 #include "utilities/macros.hpp"
 #if INCLUDE_ALL_GCS
 class DirtyCardQueueSet;
 class G1SATBCardTableLoggingModRefBS;
 // This barrier is specialized to use a logging barrier to support
 // snapshot-at-the-beginning marking.
 class G1SATBCardTableModRefBS: public CardTableModRefBSForCTRS {
 protected:
   enum G1CardValues {
     g1_young_gen = CT_MR_BS_last_reserved << 1
   };
 public:
   static int g1_young_card_val()   { return g1_young_gen; }
   // Add "pre_val" to a set of objects that may have been disconnected from the
   // pre-marking object graph.
   static void enqueue(oop pre_val);
   G1SATBCardTableModRefBS(MemRegion whole_heap,
                           int max_covered_regions);
   bool is_a(BarrierSet::Name bsn) {
     return bsn == BarrierSet::G1SATBCT || CardTableModRefBS::is_a(bsn);
   }
   virtual bool has_write_ref_pre_barrier() { return true; }
   // This notes that we don't need to access any BarrierSet data
   // structures, so this can be called from a static context.
   template <class T> static void write_ref_field_pre_static(T* field, oop newVal) {
     T heap_oop = oopDesc::load_heap_oop(field);
     if (!oopDesc::is_null(heap_oop)) {
       enqueue(oopDesc::decode_heap_oop(heap_oop));
     }
   }
   // We export this to make it available in cases where the static
   // type of the barrier set is known.  Note that it is non-virtual.
   template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) {
     write_ref_field_pre_static(field, newVal);
   }
   // These are the more general virtual versions.
   virtual void write_ref_field_pre_work(oop* field, oop new_val) {
     inline_write_ref_field_pre(field, new_val);
   }
   virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) {
     inline_write_ref_field_pre(field, new_val);
   }
   virtual void write_ref_field_pre_work(void* field, oop new_val) {
     guarantee(false, "Not needed");
   }
   template <class T> void write_ref_array_pre_work(T* dst, int count);
   virtual void write_ref_array_pre(oop* dst, int count, bool dest_uninitialized);
   virtual void write_ref_array_pre(narrowOop* dst, int count, bool dest_uninitialized);
 /*
    Claimed and deferred bits are used together in G1 during the evacuation
    pause. These bits can have the following state transitions:
 . The claimed bit can be put over any other card state. Except that
       the "dirty -> dirty and claimed" transition is checked for in
       G1 code and is not used.
 . Deferred bit can be set only if the previous state of the card
       was either clean or claimed. mark_card_deferred() is wait-free.
       We do not care if the operation is be successful because if
       it does not it will only result in duplicate entry in the update
       buffer because of the "cache-miss". So it's not worth spinning.
  */
   bool is_card_claimed(size_t card_index) {
     jbyte val = _byte_map[card_index];
     return (val & (clean_card_mask_val() | claimed_card_val())) == claimed_card_val();
   }
   void set_card_claimed(size_t card_index) {
       jbyte val = _byte_map[card_index];
       if (val == clean_card_val()) {
         val = (jbyte)claimed_card_val();
       } else {
         val |= (jbyte)claimed_card_val();
       }
       _byte_map[card_index] = val;
   }
   void verify_g1_young_region(MemRegion mr) PRODUCT_RETURN;
   void g1_mark_as_young(const MemRegion& mr);
   bool mark_card_deferred(size_t card_index);
   bool is_card_deferred(size_t card_index) {
     jbyte val = _byte_map[card_index];
     return (val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val();
   }
 };
 class G1SATBCardTableLoggingModRefBSChangedListener : public G1MappingChangedListener {
  private:
   G1SATBCardTableLoggingModRefBS* _card_table;
  public:
   G1SATBCardTableLoggingModRefBSChangedListener() : _card_table(NULL) { }
   void set_card_table(G1SATBCardTableLoggingModRefBS* card_table) { _card_table = card_table; }
   virtual void on_commit(uint start_idx, size_t num_regions);
 };
 // Adds card-table logging to the post-barrier.
 // Usual invariant: all dirty cards are logged in the DirtyCardQueueSet.
 class G1SATBCardTableLoggingModRefBS: public G1SATBCardTableModRefBS {
   friend class G1SATBCardTableLoggingModRefBSChangedListener;
  private:
   G1SATBCardTableLoggingModRefBSChangedListener _listener;
   DirtyCardQueueSet& _dcqs;
  public:
   static size_t compute_size(size_t mem_region_size_in_words) {
     size_t number_of_slots = (mem_region_size_in_words / card_size_in_words);
     return ReservedSpace::allocation_align_size_up(number_of_slots);
   }
   G1SATBCardTableLoggingModRefBS(MemRegion whole_heap,
                                  int max_covered_regions);
   virtual void initialize() { }
   virtual void initialize(G1RegionToSpaceMapper* mapper);
   virtual void resize_covered_region(MemRegion new_region) { ShouldNotReachHere(); }
   bool is_a(BarrierSet::Name bsn) {
     return bsn == BarrierSet::G1SATBCTLogging ||
       G1SATBCardTableModRefBS::is_a(bsn);
   }
   void write_ref_field_work(void* field, oop new_val, bool release = false);
   // Can be called from static contexts.
   static void write_ref_field_static(void* field, oop new_val);
   // NB: if you do a whole-heap invalidation, the "usual invariant" defined
   // above no longer applies.
   void invalidate(MemRegion mr, bool whole_heap = false);
   void write_region_work(MemRegion mr)    { invalidate(mr); }
   void write_ref_array_work(MemRegion mr) { invalidate(mr); }
 };
 #endif // INCLUDE_ALL_GCS
 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp@d35872270666 (annotated)

src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp