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//=-- lsan_common_mac.cc --------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of LeakSanitizer.
// Implementation of common leak checking functionality. Darwin-specific code.
//
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_platform.h"
#include "lsan_common.h"
#if CAN_SANITIZE_LEAKS && SANITIZER_MAC
#include "sanitizer_common/sanitizer_allocator_internal.h"
#include "lsan_allocator.h"
#include <pthread.h>
namespace __lsan {
typedef struct {
int disable_counter;
u32 current_thread_id;
AllocatorCache cache;
} thread_local_data_t;
static pthread_key_t key;
static pthread_once_t key_once = PTHREAD_ONCE_INIT;
// The main thread destructor requires the current thread id,
// so we can't destroy it until it's been used and reset to invalid tid
void restore_tid_data(void *ptr) {
thread_local_data_t *data = (thread_local_data_t *)ptr;
if (data->current_thread_id != kInvalidTid)
pthread_setspecific(key, data);
}
static void make_tls_key() {
CHECK_EQ(pthread_key_create(&key, restore_tid_data), 0);
}
static thread_local_data_t *get_tls_val(bool alloc) {
pthread_once(&key_once, make_tls_key);
thread_local_data_t *ptr = (thread_local_data_t *)pthread_getspecific(key);
if (ptr == NULL && alloc) {
ptr = (thread_local_data_t *)InternalAlloc(sizeof(*ptr));
ptr->disable_counter = 0;
ptr->current_thread_id = kInvalidTid;
ptr->cache = AllocatorCache();
pthread_setspecific(key, ptr);
}
return ptr;
}
bool DisabledInThisThread() {
thread_local_data_t *data = get_tls_val(false);
return data ? data->disable_counter > 0 : false;
}
void DisableInThisThread() { ++get_tls_val(true)->disable_counter; }
void EnableInThisThread() {
int *disable_counter = &get_tls_val(true)->disable_counter;
if (*disable_counter == 0) {
DisableCounterUnderflow();
}
--*disable_counter;
}
u32 GetCurrentThread() {
thread_local_data_t *data = get_tls_val(false);
CHECK(data);
return data->current_thread_id;
}
void SetCurrentThread(u32 tid) { get_tls_val(true)->current_thread_id = tid; }
AllocatorCache *GetAllocatorCache() { return &get_tls_val(true)->cache; }
// Required on Linux for initialization of TLS behavior, but should not be
// required on Darwin.
void InitializePlatformSpecificModules() {}
// Scans global variables for heap pointers.
void ProcessGlobalRegions(Frontier *frontier) {
MemoryMappingLayout memory_mapping(false);
InternalMmapVector<LoadedModule> modules(/*initial_capacity*/ 128);
memory_mapping.DumpListOfModules(&modules);
for (uptr i = 0; i < modules.size(); ++i) {
// Even when global scanning is disabled, we still need to scan
// system libraries for stashed pointers
if (!flags()->use_globals && modules[i].instrumented()) continue;
for (const __sanitizer::LoadedModule::AddressRange &range :
modules[i].ranges()) {
if (range.executable) continue;
ScanGlobalRange(range.beg, range.end, frontier);
}
}
}
void ProcessPlatformSpecificAllocations(Frontier *frontier) {
CHECK(0 && "unimplemented");
}
void DoStopTheWorld(StopTheWorldCallback callback, void *argument) {
CHECK(0 && "unimplemented");
}
} // namespace __lsan
#endif // CAN_SANITIZE_LEAKS && SANITIZER_MAC
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