aoqi@0: /*
aoqi@0:  * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #ifndef SHARE_VM_MEMORY_GENOOPCLOSURES_INLINE_HPP
aoqi@0: #define SHARE_VM_MEMORY_GENOOPCLOSURES_INLINE_HPP
aoqi@0: 
aoqi@0: #include "memory/cardTableRS.hpp"
aoqi@0: #include "memory/defNewGeneration.hpp"
aoqi@0: #include "memory/genCollectedHeap.hpp"
aoqi@0: #include "memory/genOopClosures.hpp"
aoqi@0: #include "memory/genRemSet.hpp"
aoqi@0: #include "memory/generation.hpp"
aoqi@0: #include "memory/sharedHeap.hpp"
aoqi@0: #include "memory/space.hpp"
aoqi@0: 
aoqi@0: inline OopsInGenClosure::OopsInGenClosure(Generation* gen) :
aoqi@0:   ExtendedOopClosure(gen->ref_processor()), _orig_gen(gen), _rs(NULL) {
aoqi@0:   set_generation(gen);
aoqi@0: }
aoqi@0: 
aoqi@0: inline void OopsInGenClosure::set_generation(Generation* gen) {
aoqi@0:   _gen = gen;
aoqi@0:   _gen_boundary = _gen->reserved().start();
aoqi@0:   // Barrier set for the heap, must be set after heap is initialized
aoqi@0:   if (_rs == NULL) {
aoqi@0:     GenRemSet* rs = SharedHeap::heap()->rem_set();
aoqi@0:     assert(rs->rs_kind() == GenRemSet::CardTable, "Wrong rem set kind");
aoqi@0:     _rs = (CardTableRS*)rs;
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: template <class T> inline void OopsInGenClosure::do_barrier(T* p) {
aoqi@0:   assert(generation()->is_in_reserved(p), "expected ref in generation");
aoqi@0:   T heap_oop = oopDesc::load_heap_oop(p);
aoqi@0:   assert(!oopDesc::is_null(heap_oop), "expected non-null oop");
aoqi@0:   oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
aoqi@0:   // If p points to a younger generation, mark the card.
aoqi@0:   if ((HeapWord*)obj < _gen_boundary) {
aoqi@0:     _rs->inline_write_ref_field_gc(p, obj);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: template <class T> inline void OopsInGenClosure::par_do_barrier(T* p) {
aoqi@0:   assert(generation()->is_in_reserved(p), "expected ref in generation");
aoqi@0:   T heap_oop = oopDesc::load_heap_oop(p);
aoqi@0:   assert(!oopDesc::is_null(heap_oop), "expected non-null oop");
aoqi@0:   oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
aoqi@0:   // If p points to a younger generation, mark the card.
aoqi@0:   if ((HeapWord*)obj < gen_boundary()) {
aoqi@0:     rs()->write_ref_field_gc_par(p, obj);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: inline void OopsInKlassOrGenClosure::do_klass_barrier() {
aoqi@0:   assert(_scanned_klass != NULL, "Must be");
aoqi@0:   _scanned_klass->record_modified_oops();
aoqi@0: }
aoqi@0: 
aoqi@0: // NOTE! Any changes made here should also be made
aoqi@0: // in FastScanClosure::do_oop_work()
aoqi@0: template <class T> inline void ScanClosure::do_oop_work(T* p) {
aoqi@0:   T heap_oop = oopDesc::load_heap_oop(p);
aoqi@0:   // Should we copy the obj?
aoqi@0:   if (!oopDesc::is_null(heap_oop)) {
aoqi@0:     oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
aoqi@0:     if ((HeapWord*)obj < _boundary) {
aoqi@0:       assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?");
aoqi@0:       oop new_obj = obj->is_forwarded() ? obj->forwardee()
aoqi@0:                                         : _g->copy_to_survivor_space(obj);
aoqi@0:       oopDesc::encode_store_heap_oop_not_null(p, new_obj);
aoqi@0:     }
aoqi@0: 
aoqi@0:     if (is_scanning_a_klass()) {
aoqi@0:       do_klass_barrier();
aoqi@0:     } else if (_gc_barrier) {
aoqi@0:       // Now call parent closure
aoqi@0:       do_barrier(p);
aoqi@0:     }
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: inline void ScanClosure::do_oop_nv(oop* p)       { ScanClosure::do_oop_work(p); }
aoqi@0: inline void ScanClosure::do_oop_nv(narrowOop* p) { ScanClosure::do_oop_work(p); }
aoqi@0: 
aoqi@0: // NOTE! Any changes made here should also be made
aoqi@0: // in ScanClosure::do_oop_work()
aoqi@0: template <class T> inline void FastScanClosure::do_oop_work(T* p) {
aoqi@0:   T heap_oop = oopDesc::load_heap_oop(p);
aoqi@0:   // Should we copy the obj?
aoqi@0:   if (!oopDesc::is_null(heap_oop)) {
aoqi@0:     oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
aoqi@0:     if ((HeapWord*)obj < _boundary) {
aoqi@0:       assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?");
aoqi@0:       oop new_obj = obj->is_forwarded() ? obj->forwardee()
aoqi@0:                                         : _g->copy_to_survivor_space(obj);
aoqi@0:       oopDesc::encode_store_heap_oop_not_null(p, new_obj);
aoqi@0:       if (is_scanning_a_klass()) {
aoqi@0:         do_klass_barrier();
aoqi@0:       } else if (_gc_barrier) {
aoqi@0:         // Now call parent closure
aoqi@0:         do_barrier(p);
aoqi@0:       }
aoqi@0:     }
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: inline void FastScanClosure::do_oop_nv(oop* p)       { FastScanClosure::do_oop_work(p); }
aoqi@0: inline void FastScanClosure::do_oop_nv(narrowOop* p) { FastScanClosure::do_oop_work(p); }
aoqi@0: 
aoqi@0: // Note similarity to ScanClosure; the difference is that
aoqi@0: // the barrier set is taken care of outside this closure.
aoqi@0: template <class T> inline void ScanWeakRefClosure::do_oop_work(T* p) {
aoqi@0:   assert(!oopDesc::is_null(*p), "null weak reference?");
aoqi@0:   oop obj = oopDesc::load_decode_heap_oop_not_null(p);
aoqi@0:   // weak references are sometimes scanned twice; must check
aoqi@0:   // that to-space doesn't already contain this object
aoqi@0:   if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) {
aoqi@0:     oop new_obj = obj->is_forwarded() ? obj->forwardee()
aoqi@0:                                       : _g->copy_to_survivor_space(obj);
aoqi@0:     oopDesc::encode_store_heap_oop_not_null(p, new_obj);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: inline void ScanWeakRefClosure::do_oop_nv(oop* p)       { ScanWeakRefClosure::do_oop_work(p); }
aoqi@0: inline void ScanWeakRefClosure::do_oop_nv(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); }
aoqi@0: 
aoqi@0: #endif // SHARE_VM_MEMORY_GENOOPCLOSURES_INLINE_HPP