| /* |
| * Copyright (c) 2001, 2013, 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_implementation/g1/g1SATBCardTableModRefBS.hpp" |
| #include "gc_implementation/g1/heapRegion.hpp" |
| #include "gc_implementation/g1/satbQueue.hpp" |
| #include "runtime/mutexLocker.hpp" |
| #include "runtime/orderAccess.inline.hpp" |
| #include "runtime/thread.inline.hpp" |
| |
| G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap, |
| int max_covered_regions) : |
| CardTableModRefBSForCTRS(whole_heap, max_covered_regions) |
| { |
| _kind = G1SATBCT; |
| } |
| |
| |
| void G1SATBCardTableModRefBS::enqueue(oop pre_val) { |
| // Nulls should have been already filtered. |
| assert(pre_val->is_oop(true), "Error"); |
| |
| if (!JavaThread::satb_mark_queue_set().is_active()) return; |
| Thread* thr = Thread::current(); |
| if (thr->is_Java_thread()) { |
| JavaThread* jt = (JavaThread*)thr; |
| jt->satb_mark_queue().enqueue(pre_val); |
| } else { |
| MutexLockerEx x(Shared_SATB_Q_lock, Mutex::_no_safepoint_check_flag); |
| JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val); |
| } |
| } |
| |
| template <class T> void |
| G1SATBCardTableModRefBS::write_ref_array_pre_work(T* dst, int count) { |
| if (!JavaThread::satb_mark_queue_set().is_active()) return; |
| T* elem_ptr = dst; |
| for (int i = 0; i < count; i++, elem_ptr++) { |
| T heap_oop = oopDesc::load_heap_oop(elem_ptr); |
| if (!oopDesc::is_null(heap_oop)) { |
| enqueue(oopDesc::decode_heap_oop_not_null(heap_oop)); |
| } |
| } |
| } |
| |
| bool G1SATBCardTableModRefBS::mark_card_deferred(size_t card_index) { |
| jbyte val = _byte_map[card_index]; |
| // It's already processed |
| if ((val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val()) { |
| return false; |
| } |
| |
| if (val == g1_young_gen) { |
| // the card is for a young gen region. We don't need to keep track of all pointers into young |
| return false; |
| } |
| |
| // Cached bit can be installed either on a clean card or on a claimed card. |
| jbyte new_val = val; |
| if (val == clean_card_val()) { |
| new_val = (jbyte)deferred_card_val(); |
| } else { |
| if (val & claimed_card_val()) { |
| new_val = val | (jbyte)deferred_card_val(); |
| } |
| } |
| if (new_val != val) { |
| Atomic::cmpxchg(new_val, &_byte_map[card_index], val); |
| } |
| return true; |
| } |
| |
| void G1SATBCardTableModRefBS::g1_mark_as_young(const MemRegion& mr) { |
| jbyte *const first = byte_for(mr.start()); |
| jbyte *const last = byte_after(mr.last()); |
| |
| memset(first, g1_young_gen, last - first); |
| } |
| |
| #ifndef PRODUCT |
| void G1SATBCardTableModRefBS::verify_g1_young_region(MemRegion mr) { |
| verify_region(mr, g1_young_gen, true); |
| } |
| #endif |
| |
| G1SATBCardTableLoggingModRefBS:: |
| G1SATBCardTableLoggingModRefBS(MemRegion whole_heap, |
| int max_covered_regions) : |
| G1SATBCardTableModRefBS(whole_heap, max_covered_regions), |
| _dcqs(JavaThread::dirty_card_queue_set()) |
| { |
| _kind = G1SATBCTLogging; |
| } |
| |
| void |
| G1SATBCardTableLoggingModRefBS::write_ref_field_work(void* field, |
| oop new_val, |
| bool release) { |
| volatile jbyte* byte = byte_for(field); |
| if (*byte == g1_young_gen) { |
| return; |
| } |
| OrderAccess::storeload(); |
| if (*byte != dirty_card) { |
| *byte = dirty_card; |
| Thread* thr = Thread::current(); |
| if (thr->is_Java_thread()) { |
| JavaThread* jt = (JavaThread*)thr; |
| jt->dirty_card_queue().enqueue(byte); |
| } else { |
| MutexLockerEx x(Shared_DirtyCardQ_lock, |
| Mutex::_no_safepoint_check_flag); |
| _dcqs.shared_dirty_card_queue()->enqueue(byte); |
| } |
| } |
| } |
| |
| void |
| G1SATBCardTableLoggingModRefBS::write_ref_field_static(void* field, |
| oop new_val) { |
| uintptr_t field_uint = (uintptr_t)field; |
| uintptr_t new_val_uint = cast_from_oop<uintptr_t>(new_val); |
| uintptr_t comb = field_uint ^ new_val_uint; |
| comb = comb >> HeapRegion::LogOfHRGrainBytes; |
| if (comb == 0) return; |
| if (new_val == NULL) return; |
| // Otherwise, log it. |
| G1SATBCardTableLoggingModRefBS* g1_bs = |
| (G1SATBCardTableLoggingModRefBS*)Universe::heap()->barrier_set(); |
| g1_bs->write_ref_field_work(field, new_val); |
| } |
| |
| void |
| G1SATBCardTableLoggingModRefBS::invalidate(MemRegion mr, bool whole_heap) { |
| volatile jbyte* byte = byte_for(mr.start()); |
| jbyte* last_byte = byte_for(mr.last()); |
| Thread* thr = Thread::current(); |
| if (whole_heap) { |
| while (byte <= last_byte) { |
| *byte = dirty_card; |
| byte++; |
| } |
| } else { |
| // skip all consecutive young cards |
| for (; byte <= last_byte && *byte == g1_young_gen; byte++); |
| |
| if (byte <= last_byte) { |
| OrderAccess::storeload(); |
| // Enqueue if necessary. |
| if (thr->is_Java_thread()) { |
| JavaThread* jt = (JavaThread*)thr; |
| for (; byte <= last_byte; byte++) { |
| if (*byte == g1_young_gen) { |
| continue; |
| } |
| if (*byte != dirty_card) { |
| *byte = dirty_card; |
| jt->dirty_card_queue().enqueue(byte); |
| } |
| } |
| } else { |
| MutexLockerEx x(Shared_DirtyCardQ_lock, |
| Mutex::_no_safepoint_check_flag); |
| for (; byte <= last_byte; byte++) { |
| if (*byte == g1_young_gen) { |
| continue; |
| } |
| if (*byte != dirty_card) { |
| *byte = dirty_card; |
| _dcqs.shared_dirty_card_queue()->enqueue(byte); |
| } |
| } |
| } |
| } |
| } |
| } |