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 21 namespace __tsan { 22 23 const int kTracePartSizeBits = 13; 24 const int kTracePartSize = 1 << kTracePartSizeBits; 25 const int kTraceParts = 2 * 1024 * 1024 / kTracePartSize; 26 const int kTraceSize = kTracePartSize * kTraceParts; 27 28 // Must fit into 3 bits. 29 enum 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. 42 typedef u64 Event; 43 44 struct 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 TraceHeaderTraceHeader53 TraceHeader() : stack0(), epoch0() {} 54 }; 55 56 struct 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 TraceTrace67 Trace() 68 : mtx(MutexTypeTrace, StatMtxTrace) { 69 } 70 }; 71 72 } // namespace __tsan 73 74 #endif // TSAN_TRACE_H 75