| /* |
| * Copyright (c) 2002, 2015, 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_VM_GC_PARALLEL_PSSCAVENGE_INLINE_HPP |
| #define SHARE_VM_GC_PARALLEL_PSSCAVENGE_INLINE_HPP |
| |
| #include "gc/parallel/cardTableExtension.hpp" |
| #include "gc/parallel/parallelScavengeHeap.hpp" |
| #include "gc/parallel/psPromotionManager.inline.hpp" |
| #include "gc/parallel/psScavenge.hpp" |
| #include "logging/log.hpp" |
| #include "memory/iterator.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "utilities/globalDefinitions.hpp" |
| |
| inline void PSScavenge::save_to_space_top_before_gc() { |
| ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
| _to_space_top_before_gc = heap->young_gen()->to_space()->top(); |
| } |
| |
| template <class T> inline bool PSScavenge::should_scavenge(T* p) { |
| T heap_oop = oopDesc::load_heap_oop(p); |
| return PSScavenge::is_obj_in_young(heap_oop); |
| } |
| |
| template <class T> |
| inline bool PSScavenge::should_scavenge(T* p, MutableSpace* to_space) { |
| if (should_scavenge(p)) { |
| oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
| // Skip objects copied to to_space since the scavenge started. |
| HeapWord* const addr = (HeapWord*)obj; |
| return addr < to_space_top_before_gc() || addr >= to_space->end(); |
| } |
| return false; |
| } |
| |
| template <class T> |
| inline bool PSScavenge::should_scavenge(T* p, bool check_to_space) { |
| if (check_to_space) { |
| ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
| return should_scavenge(p, heap->young_gen()->to_space()); |
| } |
| return should_scavenge(p); |
| } |
| |
| template<bool promote_immediately> |
| class PSRootsClosure: public OopClosure { |
| private: |
| PSPromotionManager* _promotion_manager; |
| |
| protected: |
| template <class T> void do_oop_work(T *p) { |
| if (PSScavenge::should_scavenge(p)) { |
| // We never card mark roots, maybe call a func without test? |
| _promotion_manager->copy_and_push_safe_barrier<T, promote_immediately>(p); |
| } |
| } |
| public: |
| PSRootsClosure(PSPromotionManager* pm) : _promotion_manager(pm) { } |
| void do_oop(oop* p) { PSRootsClosure::do_oop_work(p); } |
| void do_oop(narrowOop* p) { PSRootsClosure::do_oop_work(p); } |
| }; |
| |
| typedef PSRootsClosure</*promote_immediately=*/false> PSScavengeRootsClosure; |
| typedef PSRootsClosure</*promote_immediately=*/true> PSPromoteRootsClosure; |
| |
| // Scavenges a single oop in a Klass. |
| class PSScavengeFromKlassClosure: public OopClosure { |
| private: |
| PSPromotionManager* _pm; |
| // Used to redirty a scanned klass if it has oops |
| // pointing to the young generation after being scanned. |
| Klass* _scanned_klass; |
| public: |
| PSScavengeFromKlassClosure(PSPromotionManager* pm) : _pm(pm), _scanned_klass(NULL) { } |
| void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
| void do_oop(oop* p) { |
| ParallelScavengeHeap* psh = ParallelScavengeHeap::heap(); |
| assert(!psh->is_in_reserved(p), "GC barrier needed"); |
| if (PSScavenge::should_scavenge(p)) { |
| assert(PSScavenge::should_scavenge(p, true), "revisiting object?"); |
| |
| oop o = *p; |
| oop new_obj; |
| if (o->is_forwarded()) { |
| new_obj = o->forwardee(); |
| } else { |
| new_obj = _pm->copy_to_survivor_space</*promote_immediately=*/false>(o); |
| } |
| oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
| |
| if (PSScavenge::is_obj_in_young(new_obj)) { |
| do_klass_barrier(); |
| } |
| } |
| } |
| |
| void set_scanned_klass(Klass* klass) { |
| assert(_scanned_klass == NULL || klass == NULL, "Should always only handling one klass at a time"); |
| _scanned_klass = klass; |
| } |
| |
| private: |
| void do_klass_barrier() { |
| assert(_scanned_klass != NULL, "Should not be called without having a scanned klass"); |
| _scanned_klass->record_modified_oops(); |
| } |
| |
| }; |
| |
| // Scavenges the oop in a Klass. |
| class PSScavengeKlassClosure: public KlassClosure { |
| private: |
| PSScavengeFromKlassClosure _oop_closure; |
| protected: |
| public: |
| PSScavengeKlassClosure(PSPromotionManager* pm) : _oop_closure(pm) { } |
| void do_klass(Klass* klass) { |
| // If the klass has not been dirtied we know that there's |
| // no references into the young gen and we can skip it. |
| |
| NOT_PRODUCT(ResourceMark rm); |
| log_develop_trace(gc, scavenge)("PSScavengeKlassClosure::do_klass " PTR_FORMAT ", %s, dirty: %s", |
| p2i(klass), |
| klass->external_name(), |
| klass->has_modified_oops() ? "true" : "false"); |
| |
| if (klass->has_modified_oops()) { |
| // Clean the klass since we're going to scavenge all the metadata. |
| klass->clear_modified_oops(); |
| |
| // Setup the promotion manager to redirty this klass |
| // if references are left in the young gen. |
| _oop_closure.set_scanned_klass(klass); |
| |
| klass->oops_do(&_oop_closure); |
| |
| _oop_closure.set_scanned_klass(NULL); |
| } |
| } |
| }; |
| |
| #endif // SHARE_VM_GC_PARALLEL_PSSCAVENGE_INLINE_HPP |