1 /*
2 * Copyright (c) 2012, 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 MemPointer* itr_cur = _itr.current();
35 if (itr_cur == NULL) return NULL;
36 MemPointer* itr_next = _itr.next();
37
38 while (itr_next != NULL &&
39 same_kind((MemPointerRecord*)itr_cur, (MemPointerRecord*)itr_next)) {
40 itr_cur = itr_next;
41 itr_next = _itr.next();
42 }
43
44 return itr_cur;
45 }
46
47
48 debug_only(volatile jint MemRecorder::_instance_count = 0;)
49
50 MemRecorder::MemRecorder() {
51 assert(MemTracker::is_on(), "Native memory tracking is off");
52 debug_only(Atomic::inc(&_instance_count);)
53 debug_only(set_generation();)
54
55 if (MemTracker::track_callsite()) {
56 _pointer_records = new (std::nothrow)FixedSizeMemPointerArray<SeqMemPointerRecordEx,
57 DEFAULT_RECORDER_PTR_ARRAY_SIZE>();
58 } else {
59 _pointer_records = new (std::nothrow)FixedSizeMemPointerArray<SeqMemPointerRecord,
60 DEFAULT_RECORDER_PTR_ARRAY_SIZE>();
61 }
62 _next = NULL;
63
64
65 if (_pointer_records != NULL) {
66 // recode itself
67 record((address)this, (MemPointerRecord::malloc_tag()|mtNMT|otNMTRecorder),
68 sizeof(MemRecorder), CALLER_PC);
69 record((address)_pointer_records, (MemPointerRecord::malloc_tag()|mtNMT|otNMTRecorder),
70 _pointer_records->instance_size(),CURRENT_PC);
71 }
72 }
73
74 MemRecorder::~MemRecorder() {
75 if (_pointer_records != NULL) {
76 if (MemTracker::is_on()) {
77 MemTracker::record_free((address)_pointer_records, mtNMT);
78 MemTracker::record_free((address)this, mtNMT);
79 }
80 delete _pointer_records;
81 }
82 if (_next != NULL) {
83 delete _next;
84 }
85
86 #ifdef ASSERT
87 Atomic::dec(&_instance_count);
88 #endif
89 }
90
91 // Sorting order:
92 // 1. memory block address
93 // 2. mem pointer record tags
94 // 3. sequence number
95 int MemRecorder::sort_record_fn(const void* e1, const void* e2) {
96 const MemPointerRecord* p1 = (const MemPointerRecord*)e1;
97 const MemPointerRecord* p2 = (const MemPointerRecord*)e2;
98 int delta = UNSIGNED_COMPARE(p1->addr(), p2->addr());
99 if (delta == 0) {
100 int df = UNSIGNED_COMPARE((p1->flags() & MemPointerRecord::tag_masks),
101 (p2->flags() & MemPointerRecord::tag_masks));
102 if (df == 0) {
103 assert(p1->seq() != p2->seq(), "dup seq");
104 return p1->seq() - p2->seq();
105 } else {
106 return df;
107 }
108 } else {
109 return delta;
110 }
111 }
112
113 bool MemRecorder::record(address p, MEMFLAGS flags, size_t size, address pc) {
114 #ifdef ASSERT
115 if (MemPointerRecord::is_virtual_memory_record(flags)) {
116 assert((flags & MemPointerRecord::tag_masks) != 0, "bad virtual memory record");
117 } else {
118 assert((flags & MemPointerRecord::tag_masks) == MemPointerRecord::malloc_tag() ||
119 (flags & MemPointerRecord::tag_masks) == MemPointerRecord::free_tag() ||
120 IS_ARENA_OBJ(flags),
121 "bad malloc record");
122 }
123 // a recorder should only hold records within the same generation
124 unsigned long cur_generation = SequenceGenerator::current_generation();
125 assert(cur_generation == _generation,
126 "this thread did not enter sync point");
127 #endif
128
129 if (MemTracker::track_callsite()) {
130 SeqMemPointerRecordEx ap(p, flags, size, pc);
131 debug_only(check_dup_seq(ap.seq());)
132 return _pointer_records->append(&ap);
133 } else {
134 SeqMemPointerRecord ap(p, flags, size);
135 debug_only(check_dup_seq(ap.seq());)
136 return _pointer_records->append(&ap);
137 }
138 }
139
140 // iterator for alloc pointers
141 SequencedRecordIterator MemRecorder::pointer_itr() {
142 assert(_pointer_records != NULL, "just check");
143 _pointer_records->sort((FN_SORT)sort_record_fn);
144 return SequencedRecordIterator(_pointer_records);
145 }
146
147
148 #ifdef ASSERT
149 void MemRecorder::set_generation() {
150 _generation = SequenceGenerator::current_generation();
151 }
152
153 void MemRecorder::check_dup_seq(jint seq) const {
154 MemPointerArrayIteratorImpl itr(_pointer_records);
155 MemPointerRecord* rc = (MemPointerRecord*)itr.current();
156 while (rc != NULL) {
157 assert(rc->seq() != seq, "dup seq");
158 rc = (MemPointerRecord*)itr.next();
159 }
160 }
161
162 #endif