1 /* 2 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP 27 28 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp" 29 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 30 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp" 31 #include "gc_implementation/parallelScavenge/psScavenge.hpp" 32 33 inline void PSScavenge::save_to_space_top_before_gc() { 34 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); 35 _to_space_top_before_gc = heap->young_gen()->to_space()->top(); 36 } 37 38 template <class T> inline bool PSScavenge::should_scavenge(T* p) { 39 T heap_oop = oopDesc::load_heap_oop(p); 40 if (oopDesc::is_null(heap_oop)) return false; 41 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 42 return PSScavenge::is_obj_in_young((HeapWord*)obj); 43 } 44 45 template <class T> 46 inline bool PSScavenge::should_scavenge(T* p, MutableSpace* to_space) { 47 if (should_scavenge(p)) { 48 oop obj = oopDesc::load_decode_heap_oop_not_null(p); 49 // Skip objects copied to to_space since the scavenge started. 50 HeapWord* const addr = (HeapWord*)obj; 51 return addr < to_space_top_before_gc() || addr >= to_space->end(); 52 } 53 return false; 54 } 55 56 template <class T> 57 inline bool PSScavenge::should_scavenge(T* p, bool check_to_space) { 58 if (check_to_space) { 59 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); 60 return should_scavenge(p, heap->young_gen()->to_space()); 61 } 62 return should_scavenge(p); 63 } 64 65 // Attempt to "claim" oop at p via CAS, push the new obj if successful 66 // This version tests the oop* to make sure it is within the heap before 67 // attempting marking. 68 template <class T> 69 inline void PSScavenge::copy_and_push_safe_barrier(PSPromotionManager* pm, 70 T* p) { 71 assert(should_scavenge(p, true), "revisiting object?"); 72 73 oop o = oopDesc::load_decode_heap_oop_not_null(p); 74 oop new_obj = o->is_forwarded() 75 ? o->forwardee() 76 : pm->copy_to_survivor_space(o); 77 oopDesc::encode_store_heap_oop_not_null(p, new_obj); 78 79 // We cannot mark without test, as some code passes us pointers 80 // that are outside the heap. 81 if ((!PSScavenge::is_obj_in_young((HeapWord*)p)) && 82 Universe::heap()->is_in_reserved(p)) { 83 if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) { 84 card_table()->inline_write_ref_field_gc(p, new_obj); 85 } 86 } 87 } 88 89 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP