libsanitizer/tsan/tsan_trace.h

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