1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
//===-- asan_stats.cpp ----------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// Code related to statistics collected by AddressSanitizer.
//===----------------------------------------------------------------------===//
#include "asan_interceptors.h"
#include "asan_internal.h"
#include "asan_stats.h"
#include "asan_thread.h"
#include "sanitizer_common/sanitizer_allocator_interface.h"
#include "sanitizer_common/sanitizer_mutex.h"
#include "sanitizer_common/sanitizer_stackdepot.h"
namespace __asan {
AsanStats::AsanStats() {
Clear();
}
void AsanStats::Clear() {
CHECK(REAL(memset));
REAL(memset)(this, 0, sizeof(AsanStats));
}
static void PrintMallocStatsArray(const char *prefix,
uptr (&array)[kNumberOfSizeClasses]) {
Printf("%s", prefix);
for (uptr i = 0; i < kNumberOfSizeClasses; i++) {
if (!array[i]) continue;
Printf("%zu:%zu; ", i, array[i]);
}
Printf("\n");
}
void AsanStats::Print() {
Printf("Stats: %zuM malloced (%zuM for red zones) by %zu calls\n",
malloced>>20, malloced_redzones>>20, mallocs);
Printf("Stats: %zuM realloced by %zu calls\n", realloced>>20, reallocs);
Printf("Stats: %zuM freed by %zu calls\n", freed>>20, frees);
Printf("Stats: %zuM really freed by %zu calls\n",
really_freed>>20, real_frees);
Printf("Stats: %zuM (%zuM-%zuM) mmaped; %zu maps, %zu unmaps\n",
(mmaped-munmaped)>>20, mmaped>>20, munmaped>>20,
mmaps, munmaps);
PrintMallocStatsArray(" mallocs by size class: ", malloced_by_size);
Printf("Stats: malloc large: %zu\n", malloc_large);
}
void AsanStats::MergeFrom(const AsanStats *stats) {
uptr *dst_ptr = reinterpret_cast<uptr*>(this);
const uptr *src_ptr = reinterpret_cast<const uptr*>(stats);
uptr num_fields = sizeof(*this) / sizeof(uptr);
for (uptr i = 0; i < num_fields; i++)
dst_ptr[i] += src_ptr[i];
}
static Mutex print_lock;
static AsanStats unknown_thread_stats(LINKER_INITIALIZED);
static AsanStats dead_threads_stats(LINKER_INITIALIZED);
static Mutex dead_threads_stats_lock;
// Required for malloc_zone_statistics() on OS X. This can't be stored in
// per-thread AsanStats.
static uptr max_malloced_memory;
static void MergeThreadStats(ThreadContextBase *tctx_base, void *arg) {
AsanStats *accumulated_stats = reinterpret_cast<AsanStats*>(arg);
AsanThreadContext *tctx = static_cast<AsanThreadContext*>(tctx_base);
if (AsanThread *t = tctx->thread)
accumulated_stats->MergeFrom(&t->stats());
}
static void GetAccumulatedStats(AsanStats *stats) {
stats->Clear();
{
ThreadRegistryLock l(&asanThreadRegistry());
asanThreadRegistry()
.RunCallbackForEachThreadLocked(MergeThreadStats, stats);
}
stats->MergeFrom(&unknown_thread_stats);
{
Lock lock(&dead_threads_stats_lock);
stats->MergeFrom(&dead_threads_stats);
}
// This is not very accurate: we may miss allocation peaks that happen
// between two updates of accumulated_stats_. For more accurate bookkeeping
// the maximum should be updated on every malloc(), which is unacceptable.
if (max_malloced_memory < stats->malloced) {
max_malloced_memory = stats->malloced;
}
}
void FlushToDeadThreadStats(AsanStats *stats) {
Lock lock(&dead_threads_stats_lock);
dead_threads_stats.MergeFrom(stats);
stats->Clear();
}
void FillMallocStatistics(AsanMallocStats *malloc_stats) {
AsanStats stats;
GetAccumulatedStats(&stats);
malloc_stats->blocks_in_use = stats.mallocs;
malloc_stats->size_in_use = stats.malloced;
malloc_stats->max_size_in_use = max_malloced_memory;
malloc_stats->size_allocated = stats.mmaped;
}
AsanStats &GetCurrentThreadStats() {
AsanThread *t = GetCurrentThread();
return (t) ? t->stats() : unknown_thread_stats;
}
static void PrintAccumulatedStats() {
AsanStats stats;
GetAccumulatedStats(&stats);
// Use lock to keep reports from mixing up.
Lock lock(&print_lock);
stats.Print();
StackDepotStats stack_depot_stats = StackDepotGetStats();
Printf("Stats: StackDepot: %zd ids; %zdM allocated\n",
stack_depot_stats.n_uniq_ids, stack_depot_stats.allocated >> 20);
PrintInternalAllocatorStats();
}
} // namespace __asan
// ---------------------- Interface ---------------- {{{1
using namespace __asan;
uptr __sanitizer_get_current_allocated_bytes() {
AsanStats stats;
GetAccumulatedStats(&stats);
uptr malloced = stats.malloced;
uptr freed = stats.freed;
// Return sane value if malloced < freed due to racy
// way we update accumulated stats.
return (malloced > freed) ? malloced - freed : 0;
}
uptr __sanitizer_get_heap_size() {
AsanStats stats;
GetAccumulatedStats(&stats);
return stats.mmaped - stats.munmaped;
}
uptr __sanitizer_get_free_bytes() {
AsanStats stats;
GetAccumulatedStats(&stats);
uptr total_free = stats.mmaped
- stats.munmaped
+ stats.really_freed;
uptr total_used = stats.malloced
+ stats.malloced_redzones;
// Return sane value if total_free < total_used due to racy
// way we update accumulated stats.
return (total_free > total_used) ? total_free - total_used : 0;
}
uptr __sanitizer_get_unmapped_bytes() {
return 0;
}
void __asan_print_accumulated_stats() {
PrintAccumulatedStats();
}
|
