Thu, 26 Sep 2013 10:25:02 -0400
7195622: CheckUnhandledOops has limited usefulness now
Summary: Enable CHECK_UNHANDLED_OOPS in fastdebug builds across all supported platforms.
Reviewed-by: coleenp, hseigel, dholmes, stefank, twisti, ihse, rdurbin
Contributed-by: lois.foltan@oracle.com
1 /*
2 * Copyright (c) 2001, 2013, 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.
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23 */
25 #include "precompiled.hpp"
26 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
27 #include "gc_implementation/g1/heapRegion.hpp"
28 #include "gc_implementation/g1/satbQueue.hpp"
29 #include "runtime/mutexLocker.hpp"
30 #include "runtime/thread.inline.hpp"
32 G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap,
33 int max_covered_regions) :
34 CardTableModRefBSForCTRS(whole_heap, max_covered_regions)
35 {
36 _kind = G1SATBCT;
37 }
40 void G1SATBCardTableModRefBS::enqueue(oop pre_val) {
41 // Nulls should have been already filtered.
42 assert(pre_val->is_oop(true), "Error");
44 if (!JavaThread::satb_mark_queue_set().is_active()) return;
45 Thread* thr = Thread::current();
46 if (thr->is_Java_thread()) {
47 JavaThread* jt = (JavaThread*)thr;
48 jt->satb_mark_queue().enqueue(pre_val);
49 } else {
50 MutexLockerEx x(Shared_SATB_Q_lock, Mutex::_no_safepoint_check_flag);
51 JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val);
52 }
53 }
55 template <class T> void
56 G1SATBCardTableModRefBS::write_ref_array_pre_work(T* dst, int count) {
57 if (!JavaThread::satb_mark_queue_set().is_active()) return;
58 T* elem_ptr = dst;
59 for (int i = 0; i < count; i++, elem_ptr++) {
60 T heap_oop = oopDesc::load_heap_oop(elem_ptr);
61 if (!oopDesc::is_null(heap_oop)) {
62 enqueue(oopDesc::decode_heap_oop_not_null(heap_oop));
63 }
64 }
65 }
67 G1SATBCardTableLoggingModRefBS::
68 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap,
69 int max_covered_regions) :
70 G1SATBCardTableModRefBS(whole_heap, max_covered_regions),
71 _dcqs(JavaThread::dirty_card_queue_set())
72 {
73 _kind = G1SATBCTLogging;
74 }
76 void
77 G1SATBCardTableLoggingModRefBS::write_ref_field_work(void* field,
78 oop new_val) {
79 jbyte* byte = byte_for(field);
80 if (*byte != dirty_card) {
81 *byte = dirty_card;
82 Thread* thr = Thread::current();
83 if (thr->is_Java_thread()) {
84 JavaThread* jt = (JavaThread*)thr;
85 jt->dirty_card_queue().enqueue(byte);
86 } else {
87 MutexLockerEx x(Shared_DirtyCardQ_lock,
88 Mutex::_no_safepoint_check_flag);
89 _dcqs.shared_dirty_card_queue()->enqueue(byte);
90 }
91 }
92 }
94 void
95 G1SATBCardTableLoggingModRefBS::write_ref_field_static(void* field,
96 oop new_val) {
97 uintptr_t field_uint = (uintptr_t)field;
98 uintptr_t new_val_uint = cast_from_oop<uintptr_t>(new_val);
99 uintptr_t comb = field_uint ^ new_val_uint;
100 comb = comb >> HeapRegion::LogOfHRGrainBytes;
101 if (comb == 0) return;
102 if (new_val == NULL) return;
103 // Otherwise, log it.
104 G1SATBCardTableLoggingModRefBS* g1_bs =
105 (G1SATBCardTableLoggingModRefBS*)Universe::heap()->barrier_set();
106 g1_bs->write_ref_field_work(field, new_val);
107 }
109 void
110 G1SATBCardTableLoggingModRefBS::invalidate(MemRegion mr, bool whole_heap) {
111 jbyte* byte = byte_for(mr.start());
112 jbyte* last_byte = byte_for(mr.last());
113 Thread* thr = Thread::current();
114 if (whole_heap) {
115 while (byte <= last_byte) {
116 *byte = dirty_card;
117 byte++;
118 }
119 } else {
120 // Enqueue if necessary.
121 if (thr->is_Java_thread()) {
122 JavaThread* jt = (JavaThread*)thr;
123 while (byte <= last_byte) {
124 if (*byte != dirty_card) {
125 *byte = dirty_card;
126 jt->dirty_card_queue().enqueue(byte);
127 }
128 byte++;
129 }
130 } else {
131 MutexLockerEx x(Shared_DirtyCardQ_lock,
132 Mutex::_no_safepoint_check_flag);
133 while (byte <= last_byte) {
134 if (*byte != dirty_card) {
135 *byte = dirty_card;
136 _dcqs.shared_dirty_card_queue()->enqueue(byte);
137 }
138 byte++;
139 }
140 }
141 }
142 }