1 //===-- dfsan_thread.h ------------------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file is a part of DataFlowSanitizer. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef DFSAN_THREAD_H 14 #define DFSAN_THREAD_H 15 16 #include "dfsan_allocator.h" 17 #include "sanitizer_common/sanitizer_common.h" 18 #include "sanitizer_common/sanitizer_posix.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(thread_callback_t start_routine, void *arg, 28 bool track_origins = false); 29 static void TSDDtor(void *tsd); 30 void Destroy(); 31 32 void Init(); // Should be called from the thread itself. 33 thread_return_t ThreadStart(); 34 35 uptr stack_top(); 36 uptr stack_bottom(); 37 uptr tls_begin() { return tls_begin_; } 38 uptr tls_end() { return tls_end_; } 39 bool IsMainThread() { return start_routine_ == nullptr; } 40 41 bool InSignalHandler() { return in_signal_handler_; } 42 void EnterSignalHandler() { in_signal_handler_++; } 43 void LeaveSignalHandler() { in_signal_handler_--; } 44 45 DFsanThreadLocalMallocStorage &malloc_storage() { return malloc_storage_; } 46 47 int destructor_iterations_; 48 __sanitizer_sigset_t starting_sigset_; 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 thread_callback_t start_routine_; 62 void *arg_; 63 bool track_origins_; 64 65 StackBounds stack_; 66 67 uptr tls_begin_; 68 uptr tls_end_; 69 70 unsigned in_signal_handler_; 71 72 DFsanThreadLocalMallocStorage malloc_storage_; 73 }; 74 75 DFsanThread *GetCurrentThread(); 76 void SetCurrentThread(DFsanThread *t); 77 void DFsanTSDInit(void (*destructor)(void *tsd)); 78 void DFsanTSDDtor(void *tsd); 79 80 } // namespace __dfsan 81 82 #endif // DFSAN_THREAD_H 83