duke@435: /*
xdono@631:  * Copyright 2002-2008 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: inline void PSScavenge::save_to_space_top_before_gc() {
duke@435:   ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
duke@435:   _to_space_top_before_gc = heap->young_gen()->to_space()->top();
duke@435: }
duke@435: 
coleenp@548: template <class T> inline bool PSScavenge::should_scavenge(T* p) {
coleenp@548:   T heap_oop = oopDesc::load_heap_oop(p);
coleenp@548:   if (oopDesc::is_null(heap_oop)) return false;
coleenp@548:   oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
coleenp@548:   return PSScavenge::is_obj_in_young((HeapWord*)obj);
duke@435: }
duke@435: 
coleenp@548: template <class T>
coleenp@548: inline bool PSScavenge::should_scavenge(T* p, MutableSpace* to_space) {
duke@435:   if (should_scavenge(p)) {
coleenp@548:     oop obj = oopDesc::load_decode_heap_oop_not_null(p);
duke@435:     // Skip objects copied to to_space since the scavenge started.
coleenp@548:     HeapWord* const addr = (HeapWord*)obj;
duke@435:     return addr < to_space_top_before_gc() || addr >= to_space->end();
duke@435:   }
duke@435:   return false;
duke@435: }
duke@435: 
coleenp@548: template <class T>
coleenp@548: inline bool PSScavenge::should_scavenge(T* p, bool check_to_space) {
duke@435:   if (check_to_space) {
coleenp@548:     ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
duke@435:     return should_scavenge(p, heap->young_gen()->to_space());
duke@435:   }
duke@435:   return should_scavenge(p);
duke@435: }
duke@435: 
duke@435: // Attempt to "claim" oop at p via CAS, push the new obj if successful
duke@435: // This version tests the oop* to make sure it is within the heap before
duke@435: // attempting marking.
coleenp@548: template <class T>
duke@435: inline void PSScavenge::copy_and_push_safe_barrier(PSPromotionManager* pm,
coleenp@548:                                                    T*                  p) {
coleenp@548:   assert(should_scavenge(p, true), "revisiting object?");
duke@435: 
coleenp@548:   oop o = oopDesc::load_decode_heap_oop_not_null(p);
coleenp@548:   oop new_obj = o->is_forwarded()
coleenp@548:         ? o->forwardee()
coleenp@548:         : pm->copy_to_survivor_space(o, pm->depth_first());
coleenp@548:   oopDesc::encode_store_heap_oop_not_null(p, new_obj);
duke@435: 
duke@435:   // We cannot mark without test, as some code passes us pointers
duke@435:   // that are outside the heap.
coleenp@548:   if ((!PSScavenge::is_obj_in_young((HeapWord*)p)) &&
duke@435:       Universe::heap()->is_in_reserved(p)) {
coleenp@548:     if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) {
coleenp@548:       card_table()->inline_write_ref_field_gc(p, new_obj);
duke@435:     }
duke@435:   }
duke@435: }