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//===-- asan_thread_registry.cc -------------------------------------------===//
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// AsanThreadRegistry-related code. AsanThreadRegistry is a container
// for summaries of all created threads.
//===----------------------------------------------------------------------===//
#include "asan_stack.h"
#include "asan_thread.h"
#include "asan_thread_registry.h"
#include "sanitizer_common/sanitizer_common.h"
namespace __asan {
static AsanThreadRegistry asan_thread_registry(LINKER_INITIALIZED);
AsanThreadRegistry &asanThreadRegistry() {
return asan_thread_registry;
}
AsanThreadRegistry::AsanThreadRegistry(LinkerInitialized x)
: main_thread_(x),
main_thread_summary_(x),
accumulated_stats_(x),
max_malloced_memory_(x),
mu_(x) { }
void AsanThreadRegistry::Init() {
AsanTSDInit(AsanThreadSummary::TSDDtor);
main_thread_.set_summary(&main_thread_summary_);
main_thread_summary_.set_thread(&main_thread_);
RegisterThread(&main_thread_);
SetCurrent(&main_thread_);
// At this point only one thread exists.
inited_ = true;
}
void AsanThreadRegistry::RegisterThread(AsanThread *thread) {
BlockingMutexLock lock(&mu_);
u32 tid = n_threads_;
n_threads_++;
CHECK(n_threads_ < kMaxNumberOfThreads);
AsanThreadSummary *summary = thread->summary();
CHECK(summary != 0);
summary->set_tid(tid);
thread_summaries_[tid] = summary;
}
void AsanThreadRegistry::UnregisterThread(AsanThread *thread) {
BlockingMutexLock lock(&mu_);
FlushToAccumulatedStatsUnlocked(&thread->stats());
AsanThreadSummary *summary = thread->summary();
CHECK(summary);
summary->set_thread(0);
}
AsanThread *AsanThreadRegistry::GetMain() {
return &main_thread_;
}
AsanThread *AsanThreadRegistry::GetCurrent() {
AsanThreadSummary *summary = (AsanThreadSummary *)AsanTSDGet();
if (!summary) {
#if ASAN_ANDROID
// On Android, libc constructor is called _after_ asan_init, and cleans up
// TSD. Try to figure out if this is still the main thread by the stack
// address. We are not entirely sure that we have correct main thread
// limits, so only do this magic on Android, and only if the found thread is
// the main thread.
AsanThread* thread = FindThreadByStackAddress((uptr)&summary);
if (thread && thread->tid() == 0) {
SetCurrent(thread);
return thread;
}
#endif
return 0;
}
return summary->thread();
}
void AsanThreadRegistry::SetCurrent(AsanThread *t) {
CHECK(t->summary());
if (flags()->verbosity >= 2) {
Report("SetCurrent: %p for thread %p\n",
t->summary(), (void*)GetThreadSelf());
}
// Make sure we do not reset the current AsanThread.
CHECK(AsanTSDGet() == 0);
AsanTSDSet(t->summary());
CHECK(AsanTSDGet() == t->summary());
}
AsanStats &AsanThreadRegistry::GetCurrentThreadStats() {
AsanThread *t = GetCurrent();
return (t) ? t->stats() : main_thread_.stats();
}
void AsanThreadRegistry::GetAccumulatedStats(AsanStats *stats) {
BlockingMutexLock lock(&mu_);
UpdateAccumulatedStatsUnlocked();
internal_memcpy(stats, &accumulated_stats_, sizeof(accumulated_stats_));
}
uptr AsanThreadRegistry::GetCurrentAllocatedBytes() {
BlockingMutexLock lock(&mu_);
UpdateAccumulatedStatsUnlocked();
uptr malloced = accumulated_stats_.malloced;
uptr freed = accumulated_stats_.freed;
// Return sane value if malloced < freed due to racy
// way we update accumulated stats.
return (malloced > freed) ? malloced - freed : 1;
}
uptr AsanThreadRegistry::GetHeapSize() {
BlockingMutexLock lock(&mu_);
UpdateAccumulatedStatsUnlocked();
return accumulated_stats_.mmaped - accumulated_stats_.munmaped;
}
uptr AsanThreadRegistry::GetFreeBytes() {
BlockingMutexLock lock(&mu_);
UpdateAccumulatedStatsUnlocked();
uptr total_free = accumulated_stats_.mmaped
- accumulated_stats_.munmaped
+ accumulated_stats_.really_freed
+ accumulated_stats_.really_freed_redzones;
uptr total_used = accumulated_stats_.malloced
+ accumulated_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;
}
// Return several stats counters with a single call to
// UpdateAccumulatedStatsUnlocked().
void AsanThreadRegistry::FillMallocStatistics(AsanMallocStats *malloc_stats) {
BlockingMutexLock lock(&mu_);
UpdateAccumulatedStatsUnlocked();
malloc_stats->blocks_in_use = accumulated_stats_.mallocs;
malloc_stats->size_in_use = accumulated_stats_.malloced;
malloc_stats->max_size_in_use = max_malloced_memory_;
malloc_stats->size_allocated = accumulated_stats_.mmaped;
}
AsanThreadSummary *AsanThreadRegistry::FindByTid(u32 tid) {
CHECK(tid < n_threads_);
CHECK(thread_summaries_[tid]);
return thread_summaries_[tid];
}
AsanThread *AsanThreadRegistry::FindThreadByStackAddress(uptr addr) {
BlockingMutexLock lock(&mu_);
for (u32 tid = 0; tid < n_threads_; tid++) {
AsanThread *t = thread_summaries_[tid]->thread();
if (!t || !(t->fake_stack().StackSize())) continue;
if (t->fake_stack().AddrIsInFakeStack(addr) || t->AddrIsInStack(addr)) {
return t;
}
}
return 0;
}
void AsanThreadRegistry::UpdateAccumulatedStatsUnlocked() {
for (u32 tid = 0; tid < n_threads_; tid++) {
AsanThread *t = thread_summaries_[tid]->thread();
if (t != 0) {
FlushToAccumulatedStatsUnlocked(&t->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_ < accumulated_stats_.malloced) {
max_malloced_memory_ = accumulated_stats_.malloced;
}
}
void AsanThreadRegistry::FlushToAccumulatedStatsUnlocked(AsanStats *stats) {
// AsanStats consists of variables of type uptr only.
uptr *dst = (uptr*)&accumulated_stats_;
uptr *src = (uptr*)stats;
uptr num_fields = sizeof(AsanStats) / sizeof(uptr);
for (uptr i = 0; i < num_fields; i++) {
dst[i] += src[i];
src[i] = 0;
}
}
} // namespace __asan
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