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//===-- 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 : 1;
}
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 : 1;
}
uptr __sanitizer_get_unmapped_bytes() {
return 0;
}
void __asan_print_accumulated_stats() {
PrintAccumulatedStats();
}
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