ysr@777: /*
mikael@6198:  * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
ysr@777:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ysr@777:  *
ysr@777:  * This code is free software; you can redistribute it and/or modify it
ysr@777:  * under the terms of the GNU General Public License version 2 only, as
ysr@777:  * published by the Free Software Foundation.
ysr@777:  *
ysr@777:  * This code is distributed in the hope that it will be useful, but WITHOUT
ysr@777:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ysr@777:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ysr@777:  * version 2 for more details (a copy is included in the LICENSE file that
ysr@777:  * accompanied this code).
ysr@777:  *
ysr@777:  * You should have received a copy of the GNU General Public License version
ysr@777:  * 2 along with this work; if not, write to the Free Software Foundation,
ysr@777:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ysr@777:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
ysr@777:  *
ysr@777:  */
ysr@777: 
stefank@2314: #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP
stefank@2314: #define SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP
stefank@2314: 
tschatzl@7051: #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp"
stefank@2314: #include "memory/cardTableModRefBS.hpp"
stefank@2314: #include "memory/memRegion.hpp"
stefank@2314: #include "oops/oop.inline.hpp"
jprovino@4542: #include "utilities/macros.hpp"
stefank@2314: 
ysr@777: class DirtyCardQueueSet;
tschatzl@7051: class G1SATBCardTableLoggingModRefBS;
ysr@777: 
ysr@777: // This barrier is specialized to use a logging barrier to support
ysr@777: // snapshot-at-the-beginning marking.
ysr@777: 
ysr@777: class G1SATBCardTableModRefBS: public CardTableModRefBSForCTRS {
mgerdin@5860: protected:
mgerdin@5860:   enum G1CardValues {
mgerdin@5860:     g1_young_gen = CT_MR_BS_last_reserved << 1
mgerdin@5860:   };
mgerdin@5860: 
johnc@2781: public:
mgerdin@5860:   static int g1_young_card_val()   { return g1_young_gen; }
mgerdin@5860: 
ysr@777:   // Add "pre_val" to a set of objects that may have been disconnected from the
ysr@777:   // pre-marking object graph.
ysr@777:   static void enqueue(oop pre_val);
ysr@777: 
ysr@777:   G1SATBCardTableModRefBS(MemRegion whole_heap,
ysr@777:                           int max_covered_regions);
ysr@777: 
ysr@777:   bool is_a(BarrierSet::Name bsn) {
ysr@777:     return bsn == BarrierSet::G1SATBCT || CardTableModRefBS::is_a(bsn);
ysr@777:   }
ysr@777: 
ysr@777:   virtual bool has_write_ref_pre_barrier() { return true; }
ysr@777: 
ysr@777:   // This notes that we don't need to access any BarrierSet data
ysr@777:   // structures, so this can be called from a static context.
ysr@1280:   template <class T> static void write_ref_field_pre_static(T* field, oop newVal) {
ysr@1280:     T heap_oop = oopDesc::load_heap_oop(field);
ysr@1280:     if (!oopDesc::is_null(heap_oop)) {
ysr@1280:       enqueue(oopDesc::decode_heap_oop(heap_oop));
ysr@777:     }
ysr@777:   }
ysr@777: 
ysr@777:   // We export this to make it available in cases where the static
ysr@777:   // type of the barrier set is known.  Note that it is non-virtual.
ysr@1280:   template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) {
ysr@777:     write_ref_field_pre_static(field, newVal);
ysr@777:   }
ysr@777: 
ysr@1280:   // These are the more general virtual versions.
ysr@1280:   virtual void write_ref_field_pre_work(oop* field, oop new_val) {
ysr@777:     inline_write_ref_field_pre(field, new_val);
ysr@777:   }
ysr@1280:   virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) {
ysr@1280:     inline_write_ref_field_pre(field, new_val);
ysr@1280:   }
ysr@1280:   virtual void write_ref_field_pre_work(void* field, oop new_val) {
ysr@1280:     guarantee(false, "Not needed");
ysr@1280:   }
ysr@777: 
ysr@1280:   template <class T> void write_ref_array_pre_work(T* dst, int count);
mgerdin@6989:   virtual void write_ref_array_pre(oop* dst, int count, bool dest_uninitialized);
mgerdin@6989:   virtual void write_ref_array_pre(narrowOop* dst, int count, bool dest_uninitialized);
mgerdin@5811: 
mgerdin@5811: /*
mgerdin@5811:    Claimed and deferred bits are used together in G1 during the evacuation
mgerdin@5811:    pause. These bits can have the following state transitions:
mgerdin@5811:    1. The claimed bit can be put over any other card state. Except that
mgerdin@5811:       the "dirty -> dirty and claimed" transition is checked for in
mgerdin@5811:       G1 code and is not used.
mgerdin@5811:    2. Deferred bit can be set only if the previous state of the card
mgerdin@5811:       was either clean or claimed. mark_card_deferred() is wait-free.
mgerdin@5811:       We do not care if the operation is be successful because if
mgerdin@5811:       it does not it will only result in duplicate entry in the update
mgerdin@5811:       buffer because of the "cache-miss". So it's not worth spinning.
mgerdin@5811:  */
mgerdin@5811: 
mgerdin@5811:   bool is_card_claimed(size_t card_index) {
mgerdin@5811:     jbyte val = _byte_map[card_index];
mgerdin@5811:     return (val & (clean_card_mask_val() | claimed_card_val())) == claimed_card_val();
mgerdin@5811:   }
mgerdin@5811: 
mgerdin@5811:   void set_card_claimed(size_t card_index) {
mgerdin@5811:       jbyte val = _byte_map[card_index];
mgerdin@5811:       if (val == clean_card_val()) {
mgerdin@5811:         val = (jbyte)claimed_card_val();
mgerdin@5811:       } else {
mgerdin@5811:         val |= (jbyte)claimed_card_val();
mgerdin@5811:       }
mgerdin@5811:       _byte_map[card_index] = val;
mgerdin@5811:   }
mgerdin@5811: 
mgerdin@5860:   void verify_g1_young_region(MemRegion mr) PRODUCT_RETURN;
mgerdin@5860:   void g1_mark_as_young(const MemRegion& mr);
mgerdin@5860: 
mgerdin@5811:   bool mark_card_deferred(size_t card_index);
mgerdin@5811: 
mgerdin@5811:   bool is_card_deferred(size_t card_index) {
mgerdin@5811:     jbyte val = _byte_map[card_index];
mgerdin@5811:     return (val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val();
mgerdin@5811:   }
tschatzl@7051: };
mgerdin@5811: 
tschatzl@7051: class G1SATBCardTableLoggingModRefBSChangedListener : public G1MappingChangedListener {
tschatzl@7051:  private:
tschatzl@7051:   G1SATBCardTableLoggingModRefBS* _card_table;
tschatzl@7051:  public:
tschatzl@7051:   G1SATBCardTableLoggingModRefBSChangedListener() : _card_table(NULL) { }
tschatzl@7051: 
tschatzl@7051:   void set_card_table(G1SATBCardTableLoggingModRefBS* card_table) { _card_table = card_table; }
tschatzl@7051: 
tschatzl@7257:   virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled);
ysr@777: };
ysr@777: 
ysr@777: // Adds card-table logging to the post-barrier.
ysr@777: // Usual invariant: all dirty cards are logged in the DirtyCardQueueSet.
ysr@777: class G1SATBCardTableLoggingModRefBS: public G1SATBCardTableModRefBS {
tschatzl@7051:   friend class G1SATBCardTableLoggingModRefBSChangedListener;
ysr@777:  private:
tschatzl@7051:   G1SATBCardTableLoggingModRefBSChangedListener _listener;
ysr@777:   DirtyCardQueueSet& _dcqs;
ysr@777:  public:
tschatzl@7051:   static size_t compute_size(size_t mem_region_size_in_words) {
tschatzl@7051:     size_t number_of_slots = (mem_region_size_in_words / card_size_in_words);
tschatzl@7051:     return ReservedSpace::allocation_align_size_up(number_of_slots);
tschatzl@7051:   }
tschatzl@7051: 
ysr@777:   G1SATBCardTableLoggingModRefBS(MemRegion whole_heap,
ysr@777:                                  int max_covered_regions);
ysr@777: 
tschatzl@7051:   virtual void initialize() { }
tschatzl@7051:   virtual void initialize(G1RegionToSpaceMapper* mapper);
tschatzl@7051: 
tschatzl@7051:   virtual void resize_covered_region(MemRegion new_region) { ShouldNotReachHere(); }
tschatzl@7051: 
ysr@777:   bool is_a(BarrierSet::Name bsn) {
ysr@777:     return bsn == BarrierSet::G1SATBCTLogging ||
ysr@777:       G1SATBCardTableModRefBS::is_a(bsn);
ysr@777:   }
ysr@777: 
goetz@6493:   void write_ref_field_work(void* field, oop new_val, bool release = false);
ysr@777: 
ysr@777:   // Can be called from static contexts.
ysr@777:   static void write_ref_field_static(void* field, oop new_val);
ysr@777: 
ysr@777:   // NB: if you do a whole-heap invalidation, the "usual invariant" defined
ysr@777:   // above no longer applies.
ysr@777:   void invalidate(MemRegion mr, bool whole_heap = false);
ysr@777: 
ysr@777:   void write_region_work(MemRegion mr)    { invalidate(mr); }
ysr@777:   void write_ref_array_work(MemRegion mr) { invalidate(mr); }
ysr@777: };
ysr@777: 
stefank@2314: #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP