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/*
* Copyright (c) 2001, 2022, 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.
*
*/
#include "precompiled.hpp"
#include "gc/g1/g1BarrierSet.inline.hpp"
#include "gc/g1/g1BarrierSetAssembler.hpp"
#include "gc/g1/g1CardTable.inline.hpp"
#include "gc/g1/g1CollectedHeap.inline.hpp"
#include "gc/g1/g1SATBMarkQueueSet.hpp"
#include "gc/g1/g1ThreadLocalData.hpp"
#include "gc/g1/heapRegion.hpp"
#include "gc/shared/satbMarkQueue.hpp"
#include "logging/log.hpp"
#include "oops/access.inline.hpp"
#include "oops/compressedOops.inline.hpp"
#include "oops/oop.inline.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/javaThread.hpp"
#include "runtime/orderAccess.hpp"
#include "utilities/macros.hpp"
#ifdef COMPILER1
#include "gc/g1/c1/g1BarrierSetC1.hpp"
#endif
#ifdef COMPILER2
#include "gc/g1/c2/g1BarrierSetC2.hpp"
#endif
class G1BarrierSetC1;
class G1BarrierSetC2;
G1BarrierSet::G1BarrierSet(G1CardTable* card_table) :
CardTableBarrierSet(make_barrier_set_assembler<G1BarrierSetAssembler>(),
make_barrier_set_c1<G1BarrierSetC1>(),
make_barrier_set_c2<G1BarrierSetC2>(),
card_table,
BarrierSet::FakeRtti(BarrierSet::G1BarrierSet)),
_satb_mark_queue_buffer_allocator("SATB Buffer Allocator", G1SATBBufferSize),
_dirty_card_queue_buffer_allocator("DC Buffer Allocator", G1UpdateBufferSize),
_satb_mark_queue_set(&_satb_mark_queue_buffer_allocator),
_dirty_card_queue_set(&_dirty_card_queue_buffer_allocator)
{}
template <class T> void
G1BarrierSet::write_ref_array_pre_work(T* dst, size_t count) {
G1SATBMarkQueueSet& queue_set = G1BarrierSet::satb_mark_queue_set();
if (!queue_set.is_active()) return;
SATBMarkQueue& queue = G1ThreadLocalData::satb_mark_queue(Thread::current());
T* elem_ptr = dst;
for (size_t i = 0; i < count; i++, elem_ptr++) {
T heap_oop = RawAccess<>::oop_load(elem_ptr);
if (!CompressedOops::is_null(heap_oop)) {
queue_set.enqueue_known_active(queue, CompressedOops::decode_not_null(heap_oop));
}
}
}
void G1BarrierSet::write_ref_array_pre(oop* dst, size_t count, bool dest_uninitialized) {
if (!dest_uninitialized) {
write_ref_array_pre_work(dst, count);
}
}
void G1BarrierSet::write_ref_array_pre(narrowOop* dst, size_t count, bool dest_uninitialized) {
if (!dest_uninitialized) {
write_ref_array_pre_work(dst, count);
}
}
void G1BarrierSet::write_ref_field_post_slow(volatile CardValue* byte) {
// In the slow path, we know a card is not young
assert(*byte != G1CardTable::g1_young_card_val(), "slow path invoked without filtering");
OrderAccess::storeload();
if (*byte != G1CardTable::dirty_card_val()) {
*byte = G1CardTable::dirty_card_val();
Thread* thr = Thread::current();
G1DirtyCardQueue& queue = G1ThreadLocalData::dirty_card_queue(thr);
G1BarrierSet::dirty_card_queue_set().enqueue(queue, byte);
}
}
void G1BarrierSet::invalidate(MemRegion mr) {
if (mr.is_empty()) {
return;
}
volatile CardValue* byte = _card_table->byte_for(mr.start());
CardValue* last_byte = _card_table->byte_for(mr.last());
// skip initial young cards
for (; byte <= last_byte && *byte == G1CardTable::g1_young_card_val(); byte++);
if (byte <= last_byte) {
OrderAccess::storeload();
// Enqueue if necessary.
Thread* thr = Thread::current();
G1DirtyCardQueueSet& qset = G1BarrierSet::dirty_card_queue_set();
G1DirtyCardQueue& queue = G1ThreadLocalData::dirty_card_queue(thr);
for (; byte <= last_byte; byte++) {
CardValue bv = *byte;
if ((bv != G1CardTable::g1_young_card_val()) &&
(bv != G1CardTable::dirty_card_val())) {
*byte = G1CardTable::dirty_card_val();
qset.enqueue(queue, byte);
}
}
}
}
void G1BarrierSet::on_thread_create(Thread* thread) {
// Create thread local data
G1ThreadLocalData::create(thread);
}
void G1BarrierSet::on_thread_destroy(Thread* thread) {
// Destroy thread local data
G1ThreadLocalData::destroy(thread);
}
void G1BarrierSet::on_thread_attach(Thread* thread) {
BarrierSet::on_thread_attach(thread);
SATBMarkQueue& queue = G1ThreadLocalData::satb_mark_queue(thread);
assert(!queue.is_active(), "SATB queue should not be active");
assert(queue.buffer() == nullptr, "SATB queue should not have a buffer");
assert(queue.index() == 0, "SATB queue index should be zero");
// Can't assert that the DCQ is empty. There is early execution on
// the main thread, before it gets added to the threads list, which
// is where this is called. That execution may enqueue dirty cards.
// If we are creating the thread during a marking cycle, we should
// set the active field of the SATB queue to true. That involves
// copying the global is_active value to this thread's queue.
queue.set_active(_satb_mark_queue_set.is_active());
}
void G1BarrierSet::on_thread_detach(Thread* thread) {
// Flush any deferred card marks.
CardTableBarrierSet::on_thread_detach(thread);
{
SATBMarkQueue& queue = G1ThreadLocalData::satb_mark_queue(thread);
G1BarrierSet::satb_mark_queue_set().flush_queue(queue);
}
{
G1DirtyCardQueue& queue = G1ThreadLocalData::dirty_card_queue(thread);
G1DirtyCardQueueSet& qset = G1BarrierSet::dirty_card_queue_set();
qset.flush_queue(queue);
qset.record_detached_refinement_stats(queue.refinement_stats());
}
}
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