1//===-- tsan_trace.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 ThreadSanitizer (TSan), a race detector. 10// 11//===----------------------------------------------------------------------===// 12#ifndef TSAN_TRACE_H 13#define TSAN_TRACE_H 14 15#include "tsan_defs.h" 16#include "tsan_mutex.h" 17#include "tsan_stack_trace.h" 18#include "tsan_mutexset.h" 19 20namespace __tsan { 21 22const int kTracePartSizeBits = 13; 23const int kTracePartSize = 1 << kTracePartSizeBits; 24const int kTraceParts = 2 * 1024 * 1024 / kTracePartSize; 25const int kTraceSize = kTracePartSize * kTraceParts; 26 27// Must fit into 3 bits. 28enum EventType { 29 EventTypeMop, 30 EventTypeFuncEnter, 31 EventTypeFuncExit, 32 EventTypeLock, 33 EventTypeUnlock, 34 EventTypeRLock, 35 EventTypeRUnlock 36}; 37 38// Represents a thread event (from most significant bit): 39// u64 typ : 3; // EventType. 40// u64 addr : 61; // Associated pc. 41typedef u64 Event; 42 43const uptr kEventPCBits = 61; 44 45struct TraceHeader { 46#if !SANITIZER_GO 47 BufferedStackTrace stack0; // Start stack for the trace. 48#else 49 VarSizeStackTrace stack0; 50#endif 51 u64 epoch0; // Start epoch for the trace. 52 MutexSet mset0; 53 54 TraceHeader() : stack0(), epoch0() {} 55}; 56 57struct Trace { 58 Mutex mtx; 59#if !SANITIZER_GO 60 // Must be last to catch overflow as paging fault. 61 // Go shadow stack is dynamically allocated. 62 uptr shadow_stack[kShadowStackSize]; 63#endif 64 // Must be the last field, because we unmap the unused part in 65 // CreateThreadContext. 66 TraceHeader headers[kTraceParts]; 67 68 Trace() 69 : mtx(MutexTypeTrace, StatMtxTrace) { 70 } 71}; 72 73} // namespace __tsan 74 75#endif // TSAN_TRACE_H 76