1//===-- tsan_trace.h --------------------------------------------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file is a part of ThreadSanitizer (TSan), a race detector. 11// 12//===----------------------------------------------------------------------===// 13#ifndef TSAN_TRACE_H 14#define TSAN_TRACE_H 15 16#include "tsan_defs.h" 17#include "tsan_mutex.h" 18#include "tsan_stack_trace.h" 19#include "tsan_mutexset.h" 20 21namespace __tsan { 22 23const int kTracePartSizeBits = 13; 24const int kTracePartSize = 1 << kTracePartSizeBits; 25const int kTraceParts = 2 * 1024 * 1024 / kTracePartSize; 26const int kTraceSize = kTracePartSize * kTraceParts; 27 28// Must fit into 3 bits. 29enum EventType { 30 EventTypeMop, 31 EventTypeFuncEnter, 32 EventTypeFuncExit, 33 EventTypeLock, 34 EventTypeUnlock, 35 EventTypeRLock, 36 EventTypeRUnlock 37}; 38 39// Represents a thread event (from most significant bit): 40// u64 typ : 3; // EventType. 41// u64 addr : 61; // Associated pc. 42typedef u64 Event; 43 44struct TraceHeader { 45#ifndef SANITIZER_GO 46 BufferedStackTrace stack0; // Start stack for the trace. 47#else 48 VarSizeStackTrace stack0; 49#endif 50 u64 epoch0; // Start epoch for the trace. 51 MutexSet mset0; 52 53 TraceHeader() : stack0(), epoch0() {} 54}; 55 56struct Trace { 57 Mutex mtx; 58#ifndef SANITIZER_GO 59 // Must be last to catch overflow as paging fault. 60 // Go shadow stack is dynamically allocated. 61 uptr shadow_stack[kShadowStackSize]; 62#endif 63 // Must be the last field, because we unmap the unused part in 64 // CreateThreadContext. 65 TraceHeader headers[kTraceParts]; 66 67 Trace() 68 : mtx(MutexTypeTrace, StatMtxTrace) { 69 } 70}; 71 72} // namespace __tsan 73 74#endif // TSAN_TRACE_H 75