1 /*
   2  * Copyright (c) 2016, 2017, 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 #ifndef SHARE_VM_GC_G1_G1SATBCARDTABLEMODREFBS_INLINE_HPP
  26 #define SHARE_VM_GC_G1_G1SATBCARDTABLEMODREFBS_INLINE_HPP
  27 
  28 #include "gc/shared/accessBarrierSupport.inline.hpp"
  29 #include "gc/g1/g1SATBCardTableModRefBS.hpp"
  30 #include "oops/oop.inline.hpp"
  31 
  32 template <DecoratorSet decorators, typename T>
  33 inline void G1SATBCardTableModRefBS::write_ref_field_pre(T* field) {
  34   if (HasDecorator<decorators, ARRAYCOPY_DEST_NOT_INITIALIZED>::value ||
  35       HasDecorator<decorators, AS_NO_KEEPALIVE>::value) {
  36     return;
  37   }
  38 
  39   T heap_oop = oopDesc::load_heap_oop(field);
  40   if (!oopDesc::is_null(heap_oop)) {
  41     enqueue(oopDesc::decode_heap_oop_not_null(heap_oop));
  42   }
  43 }
  44 
  45 template <DecoratorSet decorators, typename T>
  46 inline void G1SATBCardTableLoggingModRefBS::write_ref_field_post(T* field, oop new_val) {
  47   volatile jbyte* byte = byte_for(field);
  48   if (*byte != g1_young_gen) {
  49     // Take a slow path for cards in old
  50     write_ref_field_post_slow(byte);
  51   }
  52 }
  53 
  54 void G1SATBCardTableModRefBS::set_card_claimed(size_t card_index) {
  55   jbyte val = _byte_map[card_index];
  56   if (val == clean_card_val()) {
  57     val = (jbyte)claimed_card_val();
  58   } else {
  59     val |= (jbyte)claimed_card_val();
  60   }
  61   _byte_map[card_index] = val;
  62 }
  63 
  64 inline void G1SATBCardTableModRefBS::enqueue_if_weak(DecoratorSet decorators, oop value) {
  65   assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "Reference strength must be known");
  66   const bool on_strong_oop_ref = (decorators & ON_STRONG_OOP_REF) != 0;
  67   const bool peek              = (decorators & AS_NO_KEEPALIVE) != 0;
  68 
  69   if (!peek && !on_strong_oop_ref && value != NULL) {
  70     enqueue(value);
  71   }
  72 }
  73 
  74 template <DecoratorSet decorators, typename BarrierSetT>
  75 template <typename T>
  76 inline oop G1SATBCardTableLoggingModRefBS::AccessBarrier<decorators, BarrierSetT>::
  77 oop_load_not_in_heap(T* addr) {
  78   oop value = ModRef::oop_load_not_in_heap(addr);
  79   enqueue_if_weak(decorators, value);
  80   return value;
  81 }
  82 
  83 template <DecoratorSet decorators, typename BarrierSetT>
  84 template <typename T>
  85 inline oop G1SATBCardTableLoggingModRefBS::AccessBarrier<decorators, BarrierSetT>::
  86 oop_load_in_heap(T* addr) {
  87   oop value = ModRef::oop_load_in_heap(addr);
  88   enqueue_if_weak(decorators, value);
  89   return value;
  90 }
  91 
  92 template <DecoratorSet decorators, typename BarrierSetT>
  93 inline oop G1SATBCardTableLoggingModRefBS::AccessBarrier<decorators, BarrierSetT>::
  94 oop_load_in_heap_at(oop base, ptrdiff_t offset) {
  95   oop value = ModRef::oop_load_in_heap_at(base, offset);
  96   enqueue_if_weak(AccessBarrierSupport::resolve_possibly_unknown_oop_ref_strength<decorators>(base, offset), value);
  97   return value;
  98 }
  99 
 100 template <DecoratorSet decorators, typename BarrierSetT>
 101 template <typename T>
 102 inline void G1SATBCardTableLoggingModRefBS::AccessBarrier<decorators, BarrierSetT>::
 103 oop_store_not_in_heap(T* addr, oop new_value) {
 104   if (HasDecorator<decorators, IN_CONCURRENT_ROOT>::value) {
 105     // For roots not scanned in a safepoint, we have to apply SATB barriers
 106     // even for roots.
 107     G1SATBCardTableLoggingModRefBS *bs = barrier_set_cast<G1SATBCardTableLoggingModRefBS>(BarrierSet::barrier_set());
 108     bs->write_ref_field_pre<decorators>(addr);
 109   }
 110   Raw::oop_store(addr, new_value);
 111 }
 112 
 113 #endif // SHARE_VM_GC_G1_G1SATBCARDTABLEMODREFBS_INLINE_HPP