| /* |
| * Copyright (c) 2001, 2016, 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_SHARED_GENOOPCLOSURES_INLINE_HPP |
| #define SHARE_VM_GC_SHARED_GENOOPCLOSURES_INLINE_HPP |
| |
| #include "gc/serial/defNewGeneration.hpp" |
| #include "gc/shared/cardTableRS.hpp" |
| #include "gc/shared/genCollectedHeap.hpp" |
| #include "gc/shared/genOopClosures.hpp" |
| #include "gc/shared/generation.hpp" |
| #include "gc/shared/space.hpp" |
| |
| inline OopsInGenClosure::OopsInGenClosure(Generation* gen) : |
| ExtendedOopClosure(gen->ref_processor()), _orig_gen(gen), _rs(NULL) { |
| set_generation(gen); |
| } |
| |
| inline void OopsInGenClosure::set_generation(Generation* gen) { |
| _gen = gen; |
| _gen_boundary = _gen->reserved().start(); |
| // Barrier set for the heap, must be set after heap is initialized |
| if (_rs == NULL) { |
| _rs = GenCollectedHeap::heap()->rem_set(); |
| } |
| } |
| |
| template <class T> inline void OopsInGenClosure::do_barrier(T* p) { |
| assert(generation()->is_in_reserved(p), "expected ref in generation"); |
| T heap_oop = oopDesc::load_heap_oop(p); |
| assert(!oopDesc::is_null(heap_oop), "expected non-null oop"); |
| oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| // If p points to a younger generation, mark the card. |
| if ((HeapWord*)obj < _gen_boundary) { |
| _rs->inline_write_ref_field_gc(p, obj); |
| } |
| } |
| |
| template <class T> inline void OopsInGenClosure::par_do_barrier(T* p) { |
| assert(generation()->is_in_reserved(p), "expected ref in generation"); |
| T heap_oop = oopDesc::load_heap_oop(p); |
| assert(!oopDesc::is_null(heap_oop), "expected non-null oop"); |
| oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| // If p points to a younger generation, mark the card. |
| if ((HeapWord*)obj < gen_boundary()) { |
| rs()->write_ref_field_gc_par(p, obj); |
| } |
| } |
| |
| inline void OopsInKlassOrGenClosure::do_klass_barrier() { |
| assert(_scanned_klass != NULL, "Must be"); |
| _scanned_klass->record_modified_oops(); |
| } |
| |
| // NOTE! Any changes made here should also be made |
| // in FastScanClosure::do_oop_work() |
| template <class T> inline void ScanClosure::do_oop_work(T* p) { |
| T heap_oop = oopDesc::load_heap_oop(p); |
| // Should we copy the obj? |
| if (!oopDesc::is_null(heap_oop)) { |
| oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| if ((HeapWord*)obj < _boundary) { |
| assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); |
| oop new_obj = obj->is_forwarded() ? obj->forwardee() |
| : _g->copy_to_survivor_space(obj); |
| oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
| } |
| |
| if (is_scanning_a_klass()) { |
| do_klass_barrier(); |
| } else if (_gc_barrier) { |
| // Now call parent closure |
| do_barrier(p); |
| } |
| } |
| } |
| |
| inline void ScanClosure::do_oop_nv(oop* p) { ScanClosure::do_oop_work(p); } |
| inline void ScanClosure::do_oop_nv(narrowOop* p) { ScanClosure::do_oop_work(p); } |
| |
| // NOTE! Any changes made here should also be made |
| // in ScanClosure::do_oop_work() |
| template <class T> inline void FastScanClosure::do_oop_work(T* p) { |
| T heap_oop = oopDesc::load_heap_oop(p); |
| // Should we copy the obj? |
| if (!oopDesc::is_null(heap_oop)) { |
| oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| if ((HeapWord*)obj < _boundary) { |
| assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); |
| oop new_obj = obj->is_forwarded() ? obj->forwardee() |
| : _g->copy_to_survivor_space(obj); |
| oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
| if (is_scanning_a_klass()) { |
| do_klass_barrier(); |
| } else if (_gc_barrier) { |
| // Now call parent closure |
| do_barrier(p); |
| } |
| } |
| } |
| } |
| |
| inline void FastScanClosure::do_oop_nv(oop* p) { FastScanClosure::do_oop_work(p); } |
| inline void FastScanClosure::do_oop_nv(narrowOop* p) { FastScanClosure::do_oop_work(p); } |
| |
| template <class T> void FilteringClosure::do_oop_work(T* p) { |
| T heap_oop = oopDesc::load_heap_oop(p); |
| if (!oopDesc::is_null(heap_oop)) { |
| oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| if ((HeapWord*)obj < _boundary) { |
| _cl->do_oop(p); |
| } |
| } |
| } |
| |
| void FilteringClosure::do_oop_nv(oop* p) { FilteringClosure::do_oop_work(p); } |
| void FilteringClosure::do_oop_nv(narrowOop* p) { FilteringClosure::do_oop_work(p); } |
| |
| // Note similarity to ScanClosure; the difference is that |
| // the barrier set is taken care of outside this closure. |
| template <class T> inline void ScanWeakRefClosure::do_oop_work(T* p) { |
| assert(!oopDesc::is_null(*p), "null weak reference?"); |
| oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
| // weak references are sometimes scanned twice; must check |
| // that to-space doesn't already contain this object |
| if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) { |
| oop new_obj = obj->is_forwarded() ? obj->forwardee() |
| : _g->copy_to_survivor_space(obj); |
| oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
| } |
| } |
| |
| inline void ScanWeakRefClosure::do_oop_nv(oop* p) { ScanWeakRefClosure::do_oop_work(p); } |
| inline void ScanWeakRefClosure::do_oop_nv(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); } |
| |
| #endif // SHARE_VM_GC_SHARED_GENOOPCLOSURES_INLINE_HPP |