ysr@777: /*
ysr@777:  * Copyright 2001-2007 Sun Microsystems, Inc.  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:  *
ysr@777:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
ysr@777:  * CA 95054 USA or visit www.sun.com if you need additional information or
ysr@777:  * have any questions.
ysr@777:  *
ysr@777:  */
ysr@777: 
ysr@777: #ifndef SERIALGC
ysr@777: 
ysr@777: class DirtyCardQueueSet;
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 {
ysr@777: private:
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: public:
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@777:   static void write_ref_field_pre_static(void* field, oop newVal) {
ysr@777:     assert(!UseCompressedOops, "Else needs to be templatized");
ysr@777:     oop preVal = *((oop*)field);
ysr@777:     if (preVal != NULL) {
ysr@777:       enqueue(preVal);
ysr@777:     }
ysr@777:   }
ysr@777: 
ysr@777:   // When we know the current java thread:
ysr@777:   static void write_ref_field_pre_static(void* field, oop newVal,
ysr@777:                                          JavaThread* jt);
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@777:   inline void inline_write_ref_field_pre(void* field, oop newVal) {
ysr@777:     write_ref_field_pre_static(field, newVal);
ysr@777:   }
ysr@777: 
ysr@777:   // This is the more general virtual version.
ysr@777:   void write_ref_field_pre_work(void* field, oop new_val) {
ysr@777:     inline_write_ref_field_pre(field, new_val);
ysr@777:   }
ysr@777: 
ysr@777:   virtual void write_ref_array_pre(MemRegion mr);
ysr@777: 
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 {
ysr@777:  private:
ysr@777:   DirtyCardQueueSet& _dcqs;
ysr@777:  public:
ysr@777:   G1SATBCardTableLoggingModRefBS(MemRegion whole_heap,
ysr@777:                                  int max_covered_regions);
ysr@777: 
ysr@777:   bool is_a(BarrierSet::Name bsn) {
ysr@777:     return bsn == BarrierSet::G1SATBCTLogging ||
ysr@777:       G1SATBCardTableModRefBS::is_a(bsn);
ysr@777:   }
ysr@777: 
ysr@777:   void write_ref_field_work(void* field, oop new_val);
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: 
ysr@777: };
ysr@777: 
ysr@777: 
ysr@777: #endif // SERIALGC