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1 //===-- asan_stats.cc -----------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file is a part of AddressSanitizer, an address sanity checker.
11 //
12 // Code related to statistics collected by AddressSanitizer.
13 //===----------------------------------------------------------------------===//
14 #include "asan_interceptors.h"
15 #include "asan_internal.h"
16 #include "asan_stats.h"
17 #include "asan_thread.h"
18 #include "sanitizer_common/sanitizer_allocator_interface.h"
19 #include "sanitizer_common/sanitizer_mutex.h"
20 #include "sanitizer_common/sanitizer_stackdepot.h"
21 
22 namespace __asan {
23 
AsanStats()24 AsanStats::AsanStats() {
25   Clear();
26 }
27 
Clear()28 void AsanStats::Clear() {
29   CHECK(REAL(memset));
30   REAL(memset)(this, 0, sizeof(AsanStats));
31 }
32 
PrintMallocStatsArray(const char * prefix,uptr (& array)[kNumberOfSizeClasses])33 static void PrintMallocStatsArray(const char *prefix,
34                                   uptr (&array)[kNumberOfSizeClasses]) {
35   Printf("%s", prefix);
36   for (uptr i = 0; i < kNumberOfSizeClasses; i++) {
37     if (!array[i]) continue;
38     Printf("%zu:%zu; ", i, array[i]);
39   }
40   Printf("\n");
41 }
42 
Print()43 void AsanStats::Print() {
44   Printf("Stats: %zuM malloced (%zuM for red zones) by %zu calls\n",
45              malloced>>20, malloced_redzones>>20, mallocs);
46   Printf("Stats: %zuM realloced by %zu calls\n", realloced>>20, reallocs);
47   Printf("Stats: %zuM freed by %zu calls\n", freed>>20, frees);
48   Printf("Stats: %zuM really freed by %zu calls\n",
49              really_freed>>20, real_frees);
50   Printf("Stats: %zuM (%zuM-%zuM) mmaped; %zu maps, %zu unmaps\n",
51              (mmaped-munmaped)>>20, mmaped>>20, munmaped>>20,
52              mmaps, munmaps);
53 
54   PrintMallocStatsArray("  mallocs by size class: ", malloced_by_size);
55   Printf("Stats: malloc large: %zu\n", malloc_large);
56 }
57 
MergeFrom(const AsanStats * stats)58 void AsanStats::MergeFrom(const AsanStats *stats) {
59   uptr *dst_ptr = reinterpret_cast<uptr*>(this);
60   const uptr *src_ptr = reinterpret_cast<const uptr*>(stats);
61   uptr num_fields = sizeof(*this) / sizeof(uptr);
62   for (uptr i = 0; i < num_fields; i++)
63     dst_ptr[i] += src_ptr[i];
64 }
65 
66 static BlockingMutex print_lock(LINKER_INITIALIZED);
67 
68 static AsanStats unknown_thread_stats(LINKER_INITIALIZED);
69 static AsanStats dead_threads_stats(LINKER_INITIALIZED);
70 static BlockingMutex dead_threads_stats_lock(LINKER_INITIALIZED);
71 // Required for malloc_zone_statistics() on OS X. This can't be stored in
72 // per-thread AsanStats.
73 static uptr max_malloced_memory;
74 
MergeThreadStats(ThreadContextBase * tctx_base,void * arg)75 static void MergeThreadStats(ThreadContextBase *tctx_base, void *arg) {
76   AsanStats *accumulated_stats = reinterpret_cast<AsanStats*>(arg);
77   AsanThreadContext *tctx = static_cast<AsanThreadContext*>(tctx_base);
78   if (AsanThread *t = tctx->thread)
79     accumulated_stats->MergeFrom(&t->stats());
80 }
81 
GetAccumulatedStats(AsanStats * stats)82 static void GetAccumulatedStats(AsanStats *stats) {
83   stats->Clear();
84   {
85     ThreadRegistryLock l(&asanThreadRegistry());
86     asanThreadRegistry()
87         .RunCallbackForEachThreadLocked(MergeThreadStats, stats);
88   }
89   stats->MergeFrom(&unknown_thread_stats);
90   {
91     BlockingMutexLock lock(&dead_threads_stats_lock);
92     stats->MergeFrom(&dead_threads_stats);
93   }
94   // This is not very accurate: we may miss allocation peaks that happen
95   // between two updates of accumulated_stats_. For more accurate bookkeeping
96   // the maximum should be updated on every malloc(), which is unacceptable.
97   if (max_malloced_memory < stats->malloced) {
98     max_malloced_memory = stats->malloced;
99   }
100 }
101 
FlushToDeadThreadStats(AsanStats * stats)102 void FlushToDeadThreadStats(AsanStats *stats) {
103   BlockingMutexLock lock(&dead_threads_stats_lock);
104   dead_threads_stats.MergeFrom(stats);
105   stats->Clear();
106 }
107 
FillMallocStatistics(AsanMallocStats * malloc_stats)108 void FillMallocStatistics(AsanMallocStats *malloc_stats) {
109   AsanStats stats;
110   GetAccumulatedStats(&stats);
111   malloc_stats->blocks_in_use = stats.mallocs;
112   malloc_stats->size_in_use = stats.malloced;
113   malloc_stats->max_size_in_use = max_malloced_memory;
114   malloc_stats->size_allocated = stats.mmaped;
115 }
116 
GetCurrentThreadStats()117 AsanStats &GetCurrentThreadStats() {
118   AsanThread *t = GetCurrentThread();
119   return (t) ? t->stats() : unknown_thread_stats;
120 }
121 
PrintAccumulatedStats()122 static void PrintAccumulatedStats() {
123   AsanStats stats;
124   GetAccumulatedStats(&stats);
125   // Use lock to keep reports from mixing up.
126   BlockingMutexLock lock(&print_lock);
127   stats.Print();
128   StackDepotStats *stack_depot_stats = StackDepotGetStats();
129   Printf("Stats: StackDepot: %zd ids; %zdM allocated\n",
130          stack_depot_stats->n_uniq_ids, stack_depot_stats->allocated >> 20);
131   PrintInternalAllocatorStats();
132 }
133 
134 }  // namespace __asan
135 
136 // ---------------------- Interface ---------------- {{{1
137 using namespace __asan;  // NOLINT
138 
__sanitizer_get_current_allocated_bytes()139 uptr __sanitizer_get_current_allocated_bytes() {
140   AsanStats stats;
141   GetAccumulatedStats(&stats);
142   uptr malloced = stats.malloced;
143   uptr freed = stats.freed;
144   // Return sane value if malloced < freed due to racy
145   // way we update accumulated stats.
146   return (malloced > freed) ? malloced - freed : 1;
147 }
148 
__sanitizer_get_heap_size()149 uptr __sanitizer_get_heap_size() {
150   AsanStats stats;
151   GetAccumulatedStats(&stats);
152   return stats.mmaped - stats.munmaped;
153 }
154 
__sanitizer_get_free_bytes()155 uptr __sanitizer_get_free_bytes() {
156   AsanStats stats;
157   GetAccumulatedStats(&stats);
158   uptr total_free = stats.mmaped
159                   - stats.munmaped
160                   + stats.really_freed;
161   uptr total_used = stats.malloced
162                   + stats.malloced_redzones;
163   // Return sane value if total_free < total_used due to racy
164   // way we update accumulated stats.
165   return (total_free > total_used) ? total_free - total_used : 1;
166 }
167 
__sanitizer_get_unmapped_bytes()168 uptr __sanitizer_get_unmapped_bytes() {
169   return 0;
170 }
171 
__asan_print_accumulated_stats()172 void __asan_print_accumulated_stats() {
173   PrintAccumulatedStats();
174 }
175