162 lines
6.0 KiB
C++
162 lines
6.0 KiB
C++
/*
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* Copyright (c) 2001, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "gc/g1/g1BarrierSet.inline.hpp"
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#include "gc/g1/g1BarrierSetAssembler.hpp"
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#include "gc/g1/g1CardTable.inline.hpp"
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#include "gc/g1/g1CollectedHeap.inline.hpp"
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#include "gc/g1/g1SATBMarkQueueSet.hpp"
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#include "gc/g1/g1ThreadLocalData.hpp"
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#include "gc/g1/heapRegion.hpp"
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#include "gc/shared/satbMarkQueue.hpp"
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#include "logging/log.hpp"
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#include "oops/access.inline.hpp"
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#include "oops/compressedOops.inline.hpp"
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#include "oops/oop.inline.hpp"
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#include "runtime/interfaceSupport.inline.hpp"
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#include "runtime/orderAccess.hpp"
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#include "runtime/thread.inline.hpp"
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#include "utilities/macros.hpp"
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#ifdef COMPILER1
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#include "gc/g1/c1/g1BarrierSetC1.hpp"
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#endif
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#ifdef COMPILER2
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#include "gc/g1/c2/g1BarrierSetC2.hpp"
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#endif
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class G1BarrierSetC1;
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class G1BarrierSetC2;
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G1BarrierSet::G1BarrierSet(G1CardTable* card_table) :
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CardTableBarrierSet(make_barrier_set_assembler<G1BarrierSetAssembler>(),
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make_barrier_set_c1<G1BarrierSetC1>(),
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make_barrier_set_c2<G1BarrierSetC2>(),
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card_table,
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BarrierSet::FakeRtti(BarrierSet::G1BarrierSet)),
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_satb_mark_queue_buffer_allocator("SATB Buffer Allocator", G1SATBBufferSize),
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_dirty_card_queue_buffer_allocator("DC Buffer Allocator", G1UpdateBufferSize),
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_satb_mark_queue_set(&_satb_mark_queue_buffer_allocator),
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_dirty_card_queue_set(&_dirty_card_queue_buffer_allocator),
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_shared_dirty_card_queue(&_dirty_card_queue_set)
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{}
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void G1BarrierSet::enqueue(oop pre_val) {
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// Nulls should have been already filtered.
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assert(oopDesc::is_oop(pre_val, true), "Error");
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G1ThreadLocalData::satb_mark_queue(Thread::current()).enqueue(pre_val);
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}
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template <class T> void
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G1BarrierSet::write_ref_array_pre_work(T* dst, size_t count) {
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if (!_satb_mark_queue_set.is_active()) return;
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T* elem_ptr = dst;
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for (size_t i = 0; i < count; i++, elem_ptr++) {
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T heap_oop = RawAccess<>::oop_load(elem_ptr);
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if (!CompressedOops::is_null(heap_oop)) {
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enqueue(CompressedOops::decode_not_null(heap_oop));
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}
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}
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}
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void G1BarrierSet::write_ref_array_pre(oop* dst, size_t count, bool dest_uninitialized) {
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if (!dest_uninitialized) {
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write_ref_array_pre_work(dst, count);
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}
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}
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void G1BarrierSet::write_ref_array_pre(narrowOop* dst, size_t count, bool dest_uninitialized) {
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if (!dest_uninitialized) {
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write_ref_array_pre_work(dst, count);
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}
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}
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void G1BarrierSet::write_ref_field_post_slow(volatile CardValue* byte) {
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// In the slow path, we know a card is not young
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assert(*byte != G1CardTable::g1_young_card_val(), "slow path invoked without filtering");
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OrderAccess::storeload();
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if (*byte != G1CardTable::dirty_card_val()) {
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*byte = G1CardTable::dirty_card_val();
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Thread* thr = Thread::current();
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G1ThreadLocalData::dirty_card_queue(thr).enqueue(byte);
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}
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}
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void G1BarrierSet::invalidate(MemRegion mr) {
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if (mr.is_empty()) {
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return;
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}
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volatile CardValue* byte = _card_table->byte_for(mr.start());
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CardValue* last_byte = _card_table->byte_for(mr.last());
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// skip initial young cards
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for (; byte <= last_byte && *byte == G1CardTable::g1_young_card_val(); byte++);
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if (byte <= last_byte) {
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OrderAccess::storeload();
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// Enqueue if necessary.
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Thread* thr = Thread::current();
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G1DirtyCardQueue& queue = G1ThreadLocalData::dirty_card_queue(thr);
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for (; byte <= last_byte; byte++) {
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CardValue bv = *byte;
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if ((bv != G1CardTable::g1_young_card_val()) &&
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(bv != G1CardTable::dirty_card_val())) {
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*byte = G1CardTable::dirty_card_val();
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queue.enqueue(byte);
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}
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}
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}
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}
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void G1BarrierSet::on_thread_create(Thread* thread) {
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// Create thread local data
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G1ThreadLocalData::create(thread);
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}
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void G1BarrierSet::on_thread_destroy(Thread* thread) {
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// Destroy thread local data
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G1ThreadLocalData::destroy(thread);
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}
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void G1BarrierSet::on_thread_attach(Thread* thread) {
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assert(!G1ThreadLocalData::satb_mark_queue(thread).is_active(), "SATB queue should not be active");
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assert(G1ThreadLocalData::satb_mark_queue(thread).is_empty(), "SATB queue should be empty");
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assert(G1ThreadLocalData::dirty_card_queue(thread).is_active(), "Dirty card queue should be active");
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// Can't assert that the DCQ is empty. There is early execution on
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// the main thread, before it gets added to the threads list, which
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// is where this is called. That execution may enqueue dirty cards.
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// If we are creating the thread during a marking cycle, we should
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// set the active field of the SATB queue to true. That involves
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// copying the global is_active value to this thread's queue.
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bool is_satb_active = _satb_mark_queue_set.is_active();
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G1ThreadLocalData::satb_mark_queue(thread).set_active(is_satb_active);
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}
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void G1BarrierSet::on_thread_detach(Thread* thread) {
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// Flush any deferred card marks.
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CardTableBarrierSet::on_thread_detach(thread);
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G1ThreadLocalData::satb_mark_queue(thread).flush();
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G1ThreadLocalData::dirty_card_queue(thread).on_thread_detach();
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}
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