1 /*
2 * Copyright (c) 2012, 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.
22 *
23 */
24
25 #include "precompiled.hpp"
26
27 #include "runtime/atomic.hpp"
28 #include "services/memBaseline.hpp"
29 #include "services/memRecorder.hpp"
30 #include "services/memPtr.hpp"
31 #include "services/memTracker.hpp"
32
33 MemPointer* SequencedRecordIterator::next_record() {
34 MemPointerRecord* itr_cur = (MemPointerRecord*)_itr.current();
35 if (itr_cur == NULL) {
36 return itr_cur;
37 }
38
39 MemPointerRecord* itr_next = (MemPointerRecord*)_itr.next();
40
41 // don't collapse virtual memory records
42 while (itr_next != NULL && !itr_cur->is_vm_pointer() &&
43 !itr_next->is_vm_pointer() &&
44 same_kind(itr_cur, itr_next)) {
45 itr_cur = itr_next;
46 itr_next = (MemPointerRecord*)_itr.next();
47 }
48
49 return itr_cur;
50 }
51
52
53 volatile jint MemRecorder::_instance_count = 0;
54
55 MemRecorder::MemRecorder() {
56 assert(MemTracker::is_on(), "Native memory tracking is off");
57 Atomic::inc(&_instance_count);
58 set_generation();
59
60 if (MemTracker::track_callsite()) {
61 _pointer_records = new (std::nothrow)FixedSizeMemPointerArray<SeqMemPointerRecordEx,
62 DEFAULT_RECORDER_PTR_ARRAY_SIZE>();
63 } else {
64 _pointer_records = new (std::nothrow)FixedSizeMemPointerArray<SeqMemPointerRecord,
65 DEFAULT_RECORDER_PTR_ARRAY_SIZE>();
66 }
67 _next = NULL;
68
69
70 if (_pointer_records != NULL) {
71 // recode itself
72 address pc = CURRENT_PC;
73 record((address)this, (MemPointerRecord::malloc_tag()|mtNMT|otNMTRecorder),
74 sizeof(MemRecorder), SequenceGenerator::next(), pc);
75 record((address)_pointer_records, (MemPointerRecord::malloc_tag()|mtNMT|otNMTRecorder),
76 _pointer_records->instance_size(), SequenceGenerator::next(), pc);
77 }
78 }
79
80 MemRecorder::~MemRecorder() {
81 if (_pointer_records != NULL) {
82 if (MemTracker::is_on()) {
83 MemTracker::record_free((address)_pointer_records, mtNMT);
84 MemTracker::record_free((address)this, mtNMT);
85 }
86 delete _pointer_records;
87 }
88 // delete all linked recorders
89 while (_next != NULL) {
90 MemRecorder* tmp = _next;
91 _next = _next->next();
92 tmp->set_next(NULL);
93 delete tmp;
94 }
95 Atomic::dec(&_instance_count);
96 }
97
98 // Sorting order:
99 // 1. memory block address
100 // 2. mem pointer record tags
101 // 3. sequence number
102 int MemRecorder::sort_record_fn(const void* e1, const void* e2) {
103 const MemPointerRecord* p1 = (const MemPointerRecord*)e1;
104 const MemPointerRecord* p2 = (const MemPointerRecord*)e2;
105 int delta = UNSIGNED_COMPARE(p1->addr(), p2->addr());
106 if (delta == 0) {
107 int df = UNSIGNED_COMPARE((p1->flags() & MemPointerRecord::tag_masks),
108 (p2->flags() & MemPointerRecord::tag_masks));
109 if (df == 0) {
110 assert(p1->seq() != p2->seq(), "dup seq");
111 return p1->seq() - p2->seq();
112 } else {
113 return df;
114 }
115 } else {
116 return delta;
117 }
118 }
119
120 bool MemRecorder::record(address p, MEMFLAGS flags, size_t size, jint seq, address pc) {
121 assert(seq > 0, "No sequence number");
122 #ifdef ASSERT
123 if (MemPointerRecord::is_virtual_memory_record(flags)) {
124 assert((flags & MemPointerRecord::tag_masks) != 0, "bad virtual memory record");
125 } else {
126 assert((flags & MemPointerRecord::tag_masks) == MemPointerRecord::malloc_tag() ||
127 (flags & MemPointerRecord::tag_masks) == MemPointerRecord::free_tag() ||
128 IS_ARENA_OBJ(flags),
129 "bad malloc record");
130 }
131 // a recorder should only hold records within the same generation
132 unsigned long cur_generation = SequenceGenerator::current_generation();
133 assert(cur_generation == _generation,
134 "this thread did not enter sync point");
135 #endif
136
137 if (MemTracker::track_callsite()) {
138 SeqMemPointerRecordEx ap(p, flags, size, seq, pc);
139 debug_only(check_dup_seq(ap.seq());)
140 return _pointer_records->append(&ap);
141 } else {
142 SeqMemPointerRecord ap(p, flags, size, seq);
143 debug_only(check_dup_seq(ap.seq());)
144 return _pointer_records->append(&ap);
145 }
146 }
147
148 // iterator for alloc pointers
149 SequencedRecordIterator MemRecorder::pointer_itr() {
150 assert(_pointer_records != NULL, "just check");
151 _pointer_records->sort((FN_SORT)sort_record_fn);
152 return SequencedRecordIterator(_pointer_records);
153 }
154
155
156 void MemRecorder::set_generation() {
157 _generation = SequenceGenerator::current_generation();
158 }
159
160 #ifdef ASSERT
161
162 void MemRecorder::check_dup_seq(jint seq) const {
163 MemPointerArrayIteratorImpl itr(_pointer_records);
164 MemPointerRecord* rc = (MemPointerRecord*)itr.current();
165 while (rc != NULL) {
166 assert(rc->seq() != seq, "dup seq");
167 rc = (MemPointerRecord*)itr.next();
168 }
169 }
170
171 #endif