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src/share/vm/gc_implementation/g1/g1_specialized_oop_closures.hpp@e1162778c1c8
src/share/vm/gc_implementation/g1/g1_specialized_oop_closures.hpp
Thu, 07 Apr 2011 09:53:20 -0700
- author
- johnc
- date
- Thu, 07 Apr 2011 09:53:20 -0700
- changeset 2781
- e1162778c1c8
- parent 2314
- f95d63e2154a
- child 2962
- ae5b2f1dcf12
- permissions
- -rw-r--r--
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
Summary: A referent object that is only weakly reachable at the start of concurrent marking but is re-attached to the strongly reachable object graph during marking may not be marked as live. This can cause the reference object to be processed prematurely and leave dangling pointers to the referent object. Implement a read barrier for the java.lang.ref.Reference::referent field by intrinsifying the Reference.get() method, and intercepting accesses though JNI, reflection, and Unsafe, so that when a non-null referent object is read it is also logged in an SATB buffer.
Reviewed-by: kvn, iveresov, never, tonyp, dholmes
1 /*
2 * Copyright (c) 2001, 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
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23 */
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1_SPECIALIZED_OOP_CLOSURES_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1_SPECIALIZED_OOP_CLOSURES_HPP
28 // The following OopClosure types get specialized versions of
29 // "oop_oop_iterate" that invoke the closures' do_oop methods
30 // non-virtually, using a mechanism defined in this file. Extend these
31 // macros in the obvious way to add specializations for new closures.
33 // Forward declarations.
34 enum G1Barrier {
35 G1BarrierNone, G1BarrierRS, G1BarrierEvac
36 };
38 template<bool do_gen_barrier, G1Barrier barrier,
39 bool do_mark_forwardee>
40 class G1ParCopyClosure;
41 class G1ParScanClosure;
42 class G1ParPushHeapRSClosure;
44 typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacClosure;
46 class FilterIntoCSClosure;
47 class FilterOutOfRegionClosure;
48 class FilterInHeapRegionAndIntoCSClosure;
49 class FilterAndMarkInHeapRegionAndIntoCSClosure;
51 #ifdef FURTHER_SPECIALIZED_OOP_OOP_ITERATE_CLOSURES
52 #error "FURTHER_SPECIALIZED_OOP_OOP_ITERATE_CLOSURES already defined."
53 #endif
55 #define FURTHER_SPECIALIZED_OOP_OOP_ITERATE_CLOSURES(f) \
56 f(G1ParScanHeapEvacClosure,_nv) \
57 f(G1ParScanClosure,_nv) \
58 f(G1ParPushHeapRSClosure,_nv) \
59 f(FilterIntoCSClosure,_nv) \
60 f(FilterOutOfRegionClosure,_nv) \
61 f(FilterInHeapRegionAndIntoCSClosure,_nv) \
62 f(FilterAndMarkInHeapRegionAndIntoCSClosure,_nv)
64 #ifdef FURTHER_SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES
65 #error "FURTHER_SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES already defined."
66 #endif
68 #define FURTHER_SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(f)
70 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1_SPECIALIZED_OOP_CLOSURES_HPP
