Mercurial > jdk8-mips64-public > hotspot / annotate
src/share/vm/memory/defNewGeneration.inline.hpp@7ae4e26cb1e0 (annotated)
src/share/vm/memory/defNewGeneration.inline.hpp
Thu, 12 Oct 2017 21:27:07 +0800
- author
- aoqi
- date
- Thu, 12 Oct 2017 21:27:07 +0800
- changeset 7535
- 7ae4e26cb1e0
- parent 6876
- 710a3c8b516e
- permissions
- -rw-r--r--
merge
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 7 | * published by the Free Software Foundation. |
| aoqi@0 | 8 | * |
| aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 13 | * accompanied this code). |
| aoqi@0 | 14 | * |
| aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 18 | * |
| aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 21 | * questions. |
| aoqi@0 | 22 | * |
| aoqi@0 | 23 | */ |
| aoqi@0 | 24 | |
| aoqi@0 | 25 | #ifndef SHARE_VM_MEMORY_DEFNEWGENERATION_INLINE_HPP |
| aoqi@0 | 26 | #define SHARE_VM_MEMORY_DEFNEWGENERATION_INLINE_HPP |
| aoqi@0 | 27 | |
| aoqi@0 | 28 | #include "memory/cardTableRS.hpp" |
| aoqi@0 | 29 | #include "memory/defNewGeneration.hpp" |
| aoqi@0 | 30 | #include "memory/space.hpp" |
| aoqi@0 | 31 | |
| aoqi@0 | 32 | // Methods of protected closure types |
| aoqi@0 | 33 | |
| aoqi@0 | 34 | template <class T> |
| aoqi@0 | 35 | inline void DefNewGeneration::KeepAliveClosure::do_oop_work(T* p) { |
| aoqi@0 | 36 | #ifdef ASSERT |
| aoqi@0 | 37 | { |
| aoqi@0 | 38 | // We never expect to see a null reference being processed |
| aoqi@0 | 39 | // as a weak reference. |
| aoqi@0 | 40 | assert (!oopDesc::is_null(*p), "expected non-null ref"); |
| aoqi@0 | 41 | oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
| aoqi@0 | 42 | assert (obj->is_oop(), "expected an oop while scanning weak refs"); |
| aoqi@0 | 43 | } |
| aoqi@0 | 44 | #endif // ASSERT |
| aoqi@0 | 45 | |
| aoqi@0 | 46 | _cl->do_oop_nv(p); |
| aoqi@0 | 47 | |
| aoqi@0 | 48 | // Card marking is trickier for weak refs. |
| aoqi@0 | 49 | // This oop is a 'next' field which was filled in while we |
| aoqi@0 | 50 | // were discovering weak references. While we might not need |
| aoqi@0 | 51 | // to take a special action to keep this reference alive, we |
| aoqi@0 | 52 | // will need to dirty a card as the field was modified. |
| aoqi@0 | 53 | // |
| aoqi@0 | 54 | // Alternatively, we could create a method which iterates through |
| aoqi@0 | 55 | // each generation, allowing them in turn to examine the modified |
| aoqi@0 | 56 | // field. |
| aoqi@0 | 57 | // |
| aoqi@0 | 58 | // We could check that p is also in an older generation, but |
| aoqi@0 | 59 | // dirty cards in the youngest gen are never scanned, so the |
| aoqi@0 | 60 | // extra check probably isn't worthwhile. |
| aoqi@0 | 61 | if (Universe::heap()->is_in_reserved(p)) { |
| aoqi@0 | 62 | oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
| aoqi@0 | 63 | _rs->inline_write_ref_field_gc(p, obj); |
| aoqi@0 | 64 | } |
| aoqi@0 | 65 | } |
| aoqi@0 | 66 | |
| aoqi@0 | 67 | template <class T> |
| aoqi@0 | 68 | inline void DefNewGeneration::FastKeepAliveClosure::do_oop_work(T* p) { |
| aoqi@0 | 69 | #ifdef ASSERT |
| aoqi@0 | 70 | { |
| aoqi@0 | 71 | // We never expect to see a null reference being processed |
| aoqi@0 | 72 | // as a weak reference. |
| aoqi@0 | 73 | assert (!oopDesc::is_null(*p), "expected non-null ref"); |
| aoqi@0 | 74 | oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
| aoqi@0 | 75 | assert (obj->is_oop(), "expected an oop while scanning weak refs"); |
| aoqi@0 | 76 | } |
| aoqi@0 | 77 | #endif // ASSERT |
| aoqi@0 | 78 | |
| aoqi@0 | 79 | _cl->do_oop_nv(p); |
| aoqi@0 | 80 | |
| aoqi@0 | 81 | // Optimized for Defnew generation if it's the youngest generation: |
| aoqi@0 | 82 | // we set a younger_gen card if we have an older->youngest |
| aoqi@0 | 83 | // generation pointer. |
| aoqi@0 | 84 | oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
| aoqi@0 | 85 | if (((HeapWord*)obj < _boundary) && Universe::heap()->is_in_reserved(p)) { |
| aoqi@0 | 86 | _rs->inline_write_ref_field_gc(p, obj); |
| aoqi@0 | 87 | } |
| aoqi@0 | 88 | } |
| aoqi@0 | 89 | |
| aoqi@0 | 90 | #endif // SHARE_VM_MEMORY_DEFNEWGENERATION_INLINE_HPP |
