1 /*
   2  * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
  27 #include "gc_implementation/g1/heapRegion.hpp"
  28 #include "gc_implementation/g1/satbQueue.hpp"
  29 #include "runtime/mutexLocker.hpp"
  30 #include "runtime/thread.inline.hpp"
  31 
  32 G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap,
  33                                                  int max_covered_regions) :
  34     CardTableModRefBSForCTRS(whole_heap, max_covered_regions)
  35 {
  36   _kind = G1SATBCT;
  37 }
  38 
  39 
  40 void G1SATBCardTableModRefBS::enqueue(oop pre_val) {
  41   // Nulls should have been already filtered.
  42   assert(pre_val->is_oop(true), "Error");
  43 
  44   if (!JavaThread::satb_mark_queue_set().is_active()) return;
  45   Thread* thr = Thread::current();
  46   if (thr->is_Java_thread()) {
  47     JavaThread* jt = (JavaThread*)thr;
  48     jt->satb_mark_queue().enqueue(pre_val);
  49   } else {
  50     MutexLockerEx x(Shared_SATB_Q_lock, Mutex::_no_safepoint_check_flag);
  51     JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val);
  52   }
  53 }
  54 
  55 template <class T> void
  56 G1SATBCardTableModRefBS::write_ref_array_pre_work(T* dst, int count) {
  57   if (!JavaThread::satb_mark_queue_set().is_active()) return;
  58   T* elem_ptr = dst;
  59   for (int i = 0; i < count; i++, elem_ptr++) {
  60     T heap_oop = oopDesc::load_heap_oop(elem_ptr);
  61     if (!oopDesc::is_null(heap_oop)) {
  62       enqueue(oopDesc::decode_heap_oop_not_null(heap_oop));
  63     }
  64   }
  65 }
  66 
  67 G1SATBCardTableLoggingModRefBS::
  68 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap,
  69                                int max_covered_regions) :
  70   G1SATBCardTableModRefBS(whole_heap, max_covered_regions),
  71   _dcqs(JavaThread::dirty_card_queue_set())
  72 {
  73   _kind = G1SATBCTLogging;
  74 }
  75 
  76 void
  77 G1SATBCardTableLoggingModRefBS::write_ref_field_work(void* field,
  78                                                      oop new_val) {
  79   jbyte* byte = byte_for(field);
  80   if (*byte != dirty_card) {
  81     *byte = dirty_card;
  82     Thread* thr = Thread::current();
  83     if (thr->is_Java_thread()) {
  84       JavaThread* jt = (JavaThread*)thr;
  85       jt->dirty_card_queue().enqueue(byte);
  86     } else {
  87       MutexLockerEx x(Shared_DirtyCardQ_lock,
  88                       Mutex::_no_safepoint_check_flag);
  89       _dcqs.shared_dirty_card_queue()->enqueue(byte);
  90     }
  91   }
  92 }
  93 
  94 void
  95 G1SATBCardTableLoggingModRefBS::write_ref_field_static(void* field,
  96                                                        oop new_val) {
  97   uintptr_t field_uint = (uintptr_t)field;
  98   uintptr_t new_val_uint = (uintptr_t)new_val;
  99   uintptr_t comb = field_uint ^ new_val_uint;
 100   comb = comb >> HeapRegion::LogOfHRGrainBytes;
 101   if (comb == 0) return;
 102   if (new_val == NULL) return;
 103   // Otherwise, log it.
 104   G1SATBCardTableLoggingModRefBS* g1_bs =
 105     (G1SATBCardTableLoggingModRefBS*)Universe::heap()->barrier_set();
 106   g1_bs->write_ref_field_work(field, new_val);
 107 }
 108 
 109 void
 110 G1SATBCardTableLoggingModRefBS::invalidate(MemRegion mr, bool whole_heap) {
 111   jbyte* byte = byte_for(mr.start());
 112   jbyte* last_byte = byte_for(mr.last());
 113   Thread* thr = Thread::current();
 114   if (whole_heap) {
 115     while (byte <= last_byte) {
 116       *byte = dirty_card;
 117       byte++;
 118     }
 119   } else {
 120     // Enqueue if necessary.
 121     if (thr->is_Java_thread()) {
 122       JavaThread* jt = (JavaThread*)thr;
 123       while (byte <= last_byte) {
 124         if (*byte != dirty_card) {
 125           *byte = dirty_card;
 126           jt->dirty_card_queue().enqueue(byte);
 127         }
 128         byte++;
 129       }
 130     } else {
 131       MutexLockerEx x(Shared_DirtyCardQ_lock,
 132                       Mutex::_no_safepoint_check_flag);
 133       while (byte <= last_byte) {
 134         if (*byte != dirty_card) {
 135           *byte = dirty_card;
 136           _dcqs.shared_dirty_card_queue()->enqueue(byte);
 137         }
 138         byte++;
 139       }
 140     }
 141   }
 142 }