161 lines
6.1 KiB
C++
161 lines
6.1 KiB
C++
/*
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* Copyright (c) 2001, 2017, 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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#ifndef SHARE_VM_GC_SHARED_GENOOPCLOSURES_INLINE_HPP
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#define SHARE_VM_GC_SHARED_GENOOPCLOSURES_INLINE_HPP
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#include "gc/serial/defNewGeneration.hpp"
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#include "gc/shared/cardTableRS.hpp"
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#include "gc/shared/genCollectedHeap.hpp"
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#include "gc/shared/genOopClosures.hpp"
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#include "gc/shared/generation.hpp"
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#include "gc/shared/space.hpp"
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#include "oops/access.inline.hpp"
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#include "oops/compressedOops.inline.hpp"
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inline OopsInGenClosure::OopsInGenClosure(Generation* gen) :
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ExtendedOopClosure(gen->ref_processor()), _orig_gen(gen), _rs(NULL) {
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set_generation(gen);
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}
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inline void OopsInGenClosure::set_generation(Generation* gen) {
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_gen = gen;
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_gen_boundary = _gen->reserved().start();
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// Barrier set for the heap, must be set after heap is initialized
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if (_rs == NULL) {
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_rs = GenCollectedHeap::heap()->rem_set();
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}
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}
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template <class T> inline void OopsInGenClosure::do_barrier(T* p) {
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assert(generation()->is_in_reserved(p), "expected ref in generation");
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T heap_oop = RawAccess<>::oop_load(p);
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assert(!CompressedOops::is_null(heap_oop), "expected non-null oop");
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oop obj = CompressedOops::decode_not_null(heap_oop);
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// If p points to a younger generation, mark the card.
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if ((HeapWord*)obj < _gen_boundary) {
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_rs->inline_write_ref_field_gc(p, obj);
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}
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}
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template <class T> inline void OopsInGenClosure::par_do_barrier(T* p) {
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assert(generation()->is_in_reserved(p), "expected ref in generation");
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T heap_oop = RawAccess<>::oop_load(p);
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assert(!CompressedOops::is_null(heap_oop), "expected non-null oop");
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oop obj = CompressedOops::decode_not_null(heap_oop);
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// If p points to a younger generation, mark the card.
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if ((HeapWord*)obj < gen_boundary()) {
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rs()->write_ref_field_gc_par(p, obj);
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}
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}
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inline void OopsInClassLoaderDataOrGenClosure::do_cld_barrier() {
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assert(_scanned_cld != NULL, "Must be");
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if (!_scanned_cld->has_modified_oops()) {
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_scanned_cld->record_modified_oops();
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}
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}
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// NOTE! Any changes made here should also be made
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// in FastScanClosure::do_oop_work()
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template <class T> inline void ScanClosure::do_oop_work(T* p) {
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T heap_oop = RawAccess<>::oop_load(p);
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// Should we copy the obj?
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if (!CompressedOops::is_null(heap_oop)) {
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oop obj = CompressedOops::decode_not_null(heap_oop);
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if ((HeapWord*)obj < _boundary) {
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assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?");
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oop new_obj = obj->is_forwarded() ? obj->forwardee()
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: _g->copy_to_survivor_space(obj);
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RawAccess<OOP_NOT_NULL>::oop_store(p, new_obj);
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}
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if (is_scanning_a_cld()) {
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do_cld_barrier();
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} else if (_gc_barrier) {
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// Now call parent closure
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do_barrier(p);
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}
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}
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}
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inline void ScanClosure::do_oop_nv(oop* p) { ScanClosure::do_oop_work(p); }
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inline void ScanClosure::do_oop_nv(narrowOop* p) { ScanClosure::do_oop_work(p); }
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// NOTE! Any changes made here should also be made
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// in ScanClosure::do_oop_work()
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template <class T> inline void FastScanClosure::do_oop_work(T* p) {
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T heap_oop = RawAccess<>::oop_load(p);
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// Should we copy the obj?
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if (!CompressedOops::is_null(heap_oop)) {
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oop obj = CompressedOops::decode_not_null(heap_oop);
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if ((HeapWord*)obj < _boundary) {
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assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?");
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oop new_obj = obj->is_forwarded() ? obj->forwardee()
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: _g->copy_to_survivor_space(obj);
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RawAccess<OOP_NOT_NULL>::oop_store(p, new_obj);
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if (is_scanning_a_cld()) {
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do_cld_barrier();
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} else if (_gc_barrier) {
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// Now call parent closure
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do_barrier(p);
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}
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}
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}
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}
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inline void FastScanClosure::do_oop_nv(oop* p) { FastScanClosure::do_oop_work(p); }
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inline void FastScanClosure::do_oop_nv(narrowOop* p) { FastScanClosure::do_oop_work(p); }
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template <class T> void FilteringClosure::do_oop_work(T* p) {
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T heap_oop = RawAccess<>::oop_load(p);
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if (!CompressedOops::is_null(heap_oop)) {
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oop obj = CompressedOops::decode_not_null(heap_oop);
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if ((HeapWord*)obj < _boundary) {
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_cl->do_oop(p);
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}
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}
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}
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void FilteringClosure::do_oop_nv(oop* p) { FilteringClosure::do_oop_work(p); }
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void FilteringClosure::do_oop_nv(narrowOop* p) { FilteringClosure::do_oop_work(p); }
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// Note similarity to ScanClosure; the difference is that
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// the barrier set is taken care of outside this closure.
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template <class T> inline void ScanWeakRefClosure::do_oop_work(T* p) {
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oop obj = RawAccess<OOP_NOT_NULL>::oop_load(p);
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// weak references are sometimes scanned twice; must check
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// that to-space doesn't already contain this object
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if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) {
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oop new_obj = obj->is_forwarded() ? obj->forwardee()
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: _g->copy_to_survivor_space(obj);
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RawAccess<OOP_NOT_NULL>::oop_store(p, new_obj);
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}
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}
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inline void ScanWeakRefClosure::do_oop_nv(oop* p) { ScanWeakRefClosure::do_oop_work(p); }
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inline void ScanWeakRefClosure::do_oop_nv(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); }
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#endif // SHARE_VM_GC_SHARED_GENOOPCLOSURES_INLINE_HPP
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