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/*
* Copyright (c) 2001, 2021, 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_GC_G1_G1BARRIERSET_HPP
#define SHARE_GC_G1_G1BARRIERSET_HPP
#include "gc/g1/g1DirtyCardQueue.hpp"
#include "gc/g1/g1SATBMarkQueueSet.hpp"
#include "gc/shared/cardTable.hpp"
#include "gc/shared/cardTableBarrierSet.hpp"
class G1CardTable;
// This barrier is specialized to use a logging barrier to support
// snapshot-at-the-beginning marking.
class G1BarrierSet: public CardTableBarrierSet {
friend class VMStructs;
private:
BufferNode::Allocator _satb_mark_queue_buffer_allocator;
BufferNode::Allocator _dirty_card_queue_buffer_allocator;
G1SATBMarkQueueSet _satb_mark_queue_set;
G1DirtyCardQueueSet _dirty_card_queue_set;
static G1BarrierSet* g1_barrier_set() {
return barrier_set_cast<G1BarrierSet>(BarrierSet::barrier_set());
}
public:
G1BarrierSet(G1CardTable* table);
~G1BarrierSet() { }
virtual bool card_mark_must_follow_store() const {
return true;
}
// Add "pre_val" to a set of objects that may have been disconnected from the
// pre-marking object graph. Prefer the version that takes location, as it
// can avoid touching the heap unnecessarily.
template <class T> static void enqueue(T* dst);
static void enqueue_preloaded(oop pre_val);
static void enqueue_preloaded_if_weak(DecoratorSet decorators, oop value);
template <class T> void write_ref_array_pre_work(T* dst, size_t count);
virtual void write_ref_array_pre(oop* dst, size_t count, bool dest_uninitialized);
virtual void write_ref_array_pre(narrowOop* dst, size_t count, bool dest_uninitialized);
template <DecoratorSet decorators, typename T>
void write_ref_field_pre(T* field);
// NB: if you do a whole-heap invalidation, the "usual invariant" defined
// above no longer applies.
void invalidate(MemRegion mr);
void write_region(MemRegion mr) { invalidate(mr); }
void write_ref_array_work(MemRegion mr) { invalidate(mr); }
template <DecoratorSet decorators, typename T>
void write_ref_field_post(T* field, oop new_val);
void write_ref_field_post_slow(volatile CardValue* byte);
virtual void on_thread_create(Thread* thread);
virtual void on_thread_destroy(Thread* thread);
virtual void on_thread_attach(Thread* thread);
virtual void on_thread_detach(Thread* thread);
static G1SATBMarkQueueSet& satb_mark_queue_set() {
return g1_barrier_set()->_satb_mark_queue_set;
}
static G1DirtyCardQueueSet& dirty_card_queue_set() {
return g1_barrier_set()->_dirty_card_queue_set;
}
// Callbacks for runtime accesses.
template <DecoratorSet decorators, typename BarrierSetT = G1BarrierSet>
class AccessBarrier: public ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT> {
typedef ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT> ModRef;
typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw;
public:
// Needed for loads on non-heap weak references
template <typename T>
static oop oop_load_not_in_heap(T* addr);
// Needed for non-heap stores
template <typename T>
static void oop_store_not_in_heap(T* addr, oop new_value);
// Needed for weak references
static oop oop_load_in_heap_at(oop base, ptrdiff_t offset);
// Defensive: will catch weak oops at addresses in heap
template <typename T>
static oop oop_load_in_heap(T* addr);
};
};
template<>
struct BarrierSet::GetName<G1BarrierSet> {
static const BarrierSet::Name value = BarrierSet::G1BarrierSet;
};
template<>
struct BarrierSet::GetType<BarrierSet::G1BarrierSet> {
typedef ::G1BarrierSet type;
};
#endif // SHARE_GC_G1_G1BARRIERSET_HPP
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