1 #ifdef USE_PRAGMA_IDENT_HDR 2 #pragma ident "@(#)psScavenge.inline.hpp 1.18 07/05/05 17:05:29 JVM" 3 #endif 4 /* 5 * Copyright 2002-2008 Sun Microsystems, Inc. All Rights Reserved. 6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 7 * 8 * This code is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License version 2 only, as 10 * published by the Free Software Foundation. 11 * 12 * This code is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 * version 2 for more details (a copy is included in the LICENSE file that 16 * accompanied this code). 17 * 18 * You should have received a copy of the GNU General Public License version 19 * 2 along with this work; if not, write to the Free Software Foundation, 20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 21 * 22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 23 * CA 95054 USA or visit www.sun.com if you need additional information or 24 * have any questions. 25 * 26 */ 27 28 inline void PSScavenge::save_to_space_top_before_gc() { 29 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); 30 _to_space_top_before_gc = heap->young_gen()->to_space()->top(); 31 } 32 33 template <class T> inline bool PSScavenge::should_scavenge(T* p) { 34 T heap_oop = oopDesc::load_heap_oop(p); 35 if (oopDesc::is_null(heap_oop)) return false; 36 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 37 return PSScavenge::is_obj_in_young((HeapWord*)obj); 38 } 39 40 template <class T> 41 inline bool PSScavenge::should_scavenge(T* p, MutableSpace* to_space) { 42 if (should_scavenge(p)) { 43 oop obj = oopDesc::load_decode_heap_oop_not_null(p); 44 // Skip objects copied to to_space since the scavenge started. 45 HeapWord* const addr = (HeapWord*)obj; 46 return addr < to_space_top_before_gc() || addr >= to_space->end(); 47 } 48 return false; 49 } 50 51 template <class T> 52 inline bool PSScavenge::should_scavenge(T* p, bool check_to_space) { 53 if (check_to_space) { 54 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); 55 return should_scavenge(p, heap->young_gen()->to_space()); 56 } 57 return should_scavenge(p); 58 } 59 60 // Attempt to "claim" oop at p via CAS, push the new obj if successful 61 // This version tests the oop* to make sure it is within the heap before 62 // attempting marking. 63 template <class T> 64 inline void PSScavenge::copy_and_push_safe_barrier(PSPromotionManager* pm, 65 T* p) { 66 assert(should_scavenge(p, true), "revisiting object?"); 67 68 oop o = oopDesc::load_decode_heap_oop_not_null(p); 69 oop new_obj = o->is_forwarded() 70 ? o->forwardee() 71 : pm->copy_to_survivor_space(o, pm->depth_first()); 72 oopDesc::encode_store_heap_oop_not_null(p, new_obj); 73 74 // We cannot mark without test, as some code passes us pointers 75 // that are outside the heap. 76 if ((!PSScavenge::is_obj_in_young((HeapWord*)p)) && 77 Universe::heap()->is_in_reserved(p)) { 78 if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) { 79 card_table()->inline_write_ref_field_gc(p, new_obj); 80 } 81 } 82 }