1 //===-- dfsan_thread.h -------------------------------------------*- C++ 2 //-*-===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file is a part of DataFlowSanitizer. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef DFSAN_THREAD_H 15 #define DFSAN_THREAD_H 16 17 #include "dfsan_allocator.h" 18 #include "sanitizer_common/sanitizer_common.h" 19 20 namespace __dfsan { 21 22 class DFsanThread { 23 public: 24 // NOTE: There is no DFsanThread constructor. It is allocated 25 // via mmap() and *must* be valid in zero-initialized state. 26 27 static DFsanThread *Create(void *start_routine_trampoline, 28 thread_callback_t start_routine, void *arg, 29 bool track_origins = false); 30 static void TSDDtor(void *tsd); 31 void Destroy(); 32 33 void Init(); // Should be called from the thread itself. 34 thread_return_t ThreadStart(); 35 36 uptr stack_top(); 37 uptr stack_bottom(); 38 uptr tls_begin() { return tls_begin_; } 39 uptr tls_end() { return tls_end_; } 40 bool IsMainThread() { return start_routine_ == nullptr; } 41 42 bool InSignalHandler() { return in_signal_handler_; } 43 void EnterSignalHandler() { in_signal_handler_++; } 44 void LeaveSignalHandler() { in_signal_handler_--; } 45 46 DFsanThreadLocalMallocStorage &malloc_storage() { return malloc_storage_; } 47 48 int destructor_iterations_; 49 50 private: 51 void SetThreadStackAndTls(); 52 void ClearShadowForThreadStackAndTLS(); 53 struct StackBounds { 54 uptr bottom; 55 uptr top; 56 }; 57 StackBounds GetStackBounds() const; 58 59 bool AddrIsInStack(uptr addr); 60 61 void *start_routine_trampoline_; 62 thread_callback_t start_routine_; 63 void *arg_; 64 bool track_origins_; 65 66 StackBounds stack_; 67 68 uptr tls_begin_; 69 uptr tls_end_; 70 71 unsigned in_signal_handler_; 72 73 DFsanThreadLocalMallocStorage malloc_storage_; 74 }; 75 76 DFsanThread *GetCurrentThread(); 77 void SetCurrentThread(DFsanThread *t); 78 void DFsanTSDInit(void (*destructor)(void *tsd)); 79 void DFsanTSDDtor(void *tsd); 80 81 } // namespace __dfsan 82 83 #endif // DFSAN_THREAD_H 84