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//===-- hwasan_thread.h -----------------------------------------*- C++ -*-===//
//
// 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 HWAddressSanitizer.
//
//===----------------------------------------------------------------------===//
#ifndef HWASAN_THREAD_H
#define HWASAN_THREAD_H
#include "hwasan_allocator.h"
#include "sanitizer_common/sanitizer_common.h"
namespace __hwasan {
class Thread {
public:
static void Create(); // Must be called from the thread itself.
void Destroy();
uptr stack_top() { return stack_top_; }
uptr stack_bottom() { return stack_bottom_; }
uptr tls_begin() { return tls_begin_; }
uptr tls_end() { return tls_end_; }
bool IsMainThread() { return unique_id_ == 0; }
bool AddrIsInStack(uptr addr) {
return addr >= stack_bottom_ && addr < stack_top_;
}
bool InSignalHandler() { return in_signal_handler_; }
void EnterSignalHandler() { in_signal_handler_++; }
void LeaveSignalHandler() { in_signal_handler_--; }
bool InSymbolizer() { return in_symbolizer_; }
void EnterSymbolizer() { in_symbolizer_++; }
void LeaveSymbolizer() { in_symbolizer_--; }
bool InInterceptorScope() { return in_interceptor_scope_; }
void EnterInterceptorScope() { in_interceptor_scope_++; }
void LeaveInterceptorScope() { in_interceptor_scope_--; }
HwasanThreadLocalMallocStorage &malloc_storage() { return malloc_storage_; }
HeapAllocationsRingBuffer *heap_allocations() {
return heap_allocations_;
}
tag_t GenerateRandomTag();
int destructor_iterations_;
void DisableTagging() { tagging_disabled_++; }
void EnableTagging() { tagging_disabled_--; }
bool TaggingIsDisabled() const { return tagging_disabled_; }
template <class CB>
static void VisitAllLiveThreads(CB cb) {
SpinMutexLock l(&thread_list_mutex);
Thread *t = main_thread;
while (t) {
cb(t);
t = t->next_;
}
}
u64 unique_id() const { return unique_id_; }
void Announce() {
if (announced_) return;
announced_ = true;
Print("Thread: ");
}
private:
// NOTE: There is no Thread constructor. It is allocated
// via mmap() and *must* be valid in zero-initialized state.
void Init();
void ClearShadowForThreadStackAndTLS();
void Print(const char *prefix);
uptr stack_top_;
uptr stack_bottom_;
uptr tls_begin_;
uptr tls_end_;
unsigned in_signal_handler_;
unsigned in_symbolizer_;
unsigned in_interceptor_scope_;
u32 random_state_;
u32 random_buffer_;
HwasanThreadLocalMallocStorage malloc_storage_;
HeapAllocationsRingBuffer *heap_allocations_;
static void InsertIntoThreadList(Thread *t);
static void RemoveFromThreadList(Thread *t);
Thread *next_; // All live threads form a linked list.
static SpinMutex thread_list_mutex;
static Thread *main_thread;
u64 unique_id_; // counting from zero.
u32 tagging_disabled_; // if non-zero, malloc uses zero tag in this thread.
bool announced_;
};
Thread *GetCurrentThread();
void SetCurrentThread(Thread *t);
struct ScopedTaggingDisabler {
ScopedTaggingDisabler() { GetCurrentThread()->DisableTagging(); }
~ScopedTaggingDisabler() { GetCurrentThread()->EnableTagging(); }
};
} // namespace __hwasan
#endif // HWASAN_THREAD_H
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