254 lines
8.5 KiB
C++
254 lines
8.5 KiB
C++
/*
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* Copyright (c) 2001, 2015, 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_implementation/g1/g1CollectedHeap.inline.hpp"
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#include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
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#include "gc_implementation/g1/heapRegion.hpp"
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#include "gc_implementation/g1/satbQueue.hpp"
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#include "oops/oop.inline.hpp"
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#include "runtime/atomic.inline.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/orderAccess.inline.hpp"
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#include "runtime/thread.inline.hpp"
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G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap, BarrierSet::Name kind) :
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CardTableModRefBS(whole_heap, kind) { }
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void G1SATBCardTableModRefBS::enqueue(oop pre_val) {
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// Nulls should have been already filtered.
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assert(pre_val->is_oop(true), "Error");
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if (!JavaThread::satb_mark_queue_set().is_active()) return;
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Thread* thr = Thread::current();
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if (thr->is_Java_thread()) {
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JavaThread* jt = (JavaThread*)thr;
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jt->satb_mark_queue().enqueue(pre_val);
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} else {
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MutexLockerEx x(Shared_SATB_Q_lock, Mutex::_no_safepoint_check_flag);
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JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val);
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}
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}
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template <class T> void
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G1SATBCardTableModRefBS::write_ref_array_pre_work(T* dst, int count) {
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if (!JavaThread::satb_mark_queue_set().is_active()) return;
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T* elem_ptr = dst;
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for (int i = 0; i < count; i++, elem_ptr++) {
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T heap_oop = oopDesc::load_heap_oop(elem_ptr);
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if (!oopDesc::is_null(heap_oop)) {
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enqueue(oopDesc::decode_heap_oop_not_null(heap_oop));
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}
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}
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}
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void G1SATBCardTableModRefBS::write_ref_array_pre(oop* dst, int 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 G1SATBCardTableModRefBS::write_ref_array_pre(narrowOop* dst, int 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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bool G1SATBCardTableModRefBS::mark_card_deferred(size_t card_index) {
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jbyte val = _byte_map[card_index];
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// It's already processed
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if ((val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val()) {
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return false;
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}
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if (val == g1_young_gen) {
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// the card is for a young gen region. We don't need to keep track of all pointers into young
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return false;
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}
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// Cached bit can be installed either on a clean card or on a claimed card.
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jbyte new_val = val;
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if (val == clean_card_val()) {
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new_val = (jbyte)deferred_card_val();
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} else {
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if (val & claimed_card_val()) {
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new_val = val | (jbyte)deferred_card_val();
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}
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}
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if (new_val != val) {
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Atomic::cmpxchg(new_val, &_byte_map[card_index], val);
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}
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return true;
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}
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void G1SATBCardTableModRefBS::g1_mark_as_young(const MemRegion& mr) {
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jbyte *const first = byte_for(mr.start());
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jbyte *const last = byte_after(mr.last());
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// Below we may use an explicit loop instead of memset() because on
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// certain platforms memset() can give concurrent readers phantom zeros.
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if (UseMemSetInBOT) {
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memset(first, g1_young_gen, last - first);
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} else {
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for (jbyte* i = first; i < last; i++) {
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*i = g1_young_gen;
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}
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}
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}
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#ifndef PRODUCT
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void G1SATBCardTableModRefBS::verify_g1_young_region(MemRegion mr) {
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verify_region(mr, g1_young_gen, true);
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}
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#endif
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void G1SATBCardTableLoggingModRefBSChangedListener::on_commit(uint start_idx, size_t num_regions, bool zero_filled) {
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// Default value for a clean card on the card table is -1. So we cannot take advantage of the zero_filled parameter.
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MemRegion mr(G1CollectedHeap::heap()->bottom_addr_for_region(start_idx), num_regions * HeapRegion::GrainWords);
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_card_table->clear(mr);
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}
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G1SATBCardTableLoggingModRefBS::
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G1SATBCardTableLoggingModRefBS(MemRegion whole_heap) :
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G1SATBCardTableModRefBS(whole_heap, BarrierSet::G1SATBCTLogging),
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_dcqs(JavaThread::dirty_card_queue_set()),
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_listener()
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{
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_listener.set_card_table(this);
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}
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void G1SATBCardTableLoggingModRefBS::initialize(G1RegionToSpaceMapper* mapper) {
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mapper->set_mapping_changed_listener(&_listener);
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_byte_map_size = mapper->reserved().byte_size();
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_guard_index = cards_required(_whole_heap.word_size()) - 1;
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_last_valid_index = _guard_index - 1;
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HeapWord* low_bound = _whole_heap.start();
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HeapWord* high_bound = _whole_heap.end();
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_cur_covered_regions = 1;
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_covered[0] = _whole_heap;
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_byte_map = (jbyte*) mapper->reserved().start();
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byte_map_base = _byte_map - (uintptr_t(low_bound) >> card_shift);
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assert(byte_for(low_bound) == &_byte_map[0], "Checking start of map");
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assert(byte_for(high_bound-1) <= &_byte_map[_last_valid_index], "Checking end of map");
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if (TraceCardTableModRefBS) {
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gclog_or_tty->print_cr("G1SATBCardTableModRefBS::G1SATBCardTableModRefBS: ");
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gclog_or_tty->print_cr(" "
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" &_byte_map[0]: " INTPTR_FORMAT
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" &_byte_map[_last_valid_index]: " INTPTR_FORMAT,
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p2i(&_byte_map[0]),
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p2i(&_byte_map[_last_valid_index]));
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gclog_or_tty->print_cr(" "
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" byte_map_base: " INTPTR_FORMAT,
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p2i(byte_map_base));
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}
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}
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void
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G1SATBCardTableLoggingModRefBS::write_ref_field_work(void* field,
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oop new_val,
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bool release) {
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volatile jbyte* byte = byte_for(field);
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if (*byte == g1_young_gen) {
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return;
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}
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OrderAccess::storeload();
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if (*byte != dirty_card) {
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*byte = dirty_card;
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Thread* thr = Thread::current();
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if (thr->is_Java_thread()) {
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JavaThread* jt = (JavaThread*)thr;
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jt->dirty_card_queue().enqueue(byte);
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} else {
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MutexLockerEx x(Shared_DirtyCardQ_lock,
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Mutex::_no_safepoint_check_flag);
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_dcqs.shared_dirty_card_queue()->enqueue(byte);
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}
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}
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}
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void
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G1SATBCardTableLoggingModRefBS::write_ref_field_static(void* field,
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oop new_val) {
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uintptr_t field_uint = (uintptr_t)field;
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uintptr_t new_val_uint = cast_from_oop<uintptr_t>(new_val);
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uintptr_t comb = field_uint ^ new_val_uint;
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comb = comb >> HeapRegion::LogOfHRGrainBytes;
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if (comb == 0) return;
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if (new_val == NULL) return;
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// Otherwise, log it.
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G1SATBCardTableLoggingModRefBS* g1_bs =
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(G1SATBCardTableLoggingModRefBS*)Universe::heap()->barrier_set();
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g1_bs->write_ref_field_work(field, new_val);
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}
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void
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G1SATBCardTableLoggingModRefBS::invalidate(MemRegion mr, bool whole_heap) {
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volatile jbyte* byte = byte_for(mr.start());
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jbyte* last_byte = byte_for(mr.last());
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Thread* thr = Thread::current();
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if (whole_heap) {
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while (byte <= last_byte) {
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*byte = dirty_card;
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byte++;
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}
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} else {
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// skip all consecutive young cards
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for (; byte <= last_byte && *byte == g1_young_gen; 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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if (thr->is_Java_thread()) {
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JavaThread* jt = (JavaThread*)thr;
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for (; byte <= last_byte; byte++) {
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if (*byte == g1_young_gen) {
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continue;
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}
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if (*byte != dirty_card) {
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*byte = dirty_card;
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jt->dirty_card_queue().enqueue(byte);
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}
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}
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} else {
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MutexLockerEx x(Shared_DirtyCardQ_lock,
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Mutex::_no_safepoint_check_flag);
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for (; byte <= last_byte; byte++) {
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if (*byte == g1_young_gen) {
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continue;
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}
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if (*byte != dirty_card) {
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*byte = dirty_card;
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_dcqs.shared_dirty_card_queue()->enqueue(byte);
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}
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}
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}
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}
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}
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}
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