Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright 2001-2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.com if you need additional information or

  * have any questions.

  *

  */

 inline OopsInGenClosure::OopsInGenClosure(Generation* gen) :

   OopClosure(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) {

     GenRemSet* rs = SharedHeap::heap()->rem_set();

     assert(rs->rs_kind() == GenRemSet::CardTable, "Wrong rem set kind");

     _rs = (CardTableRS*)rs;

   }

 }

 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);

   }

 }

 // 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 (_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 (_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); }

 // 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); }