tsan_trace.h revision 0ab628c61594eb80612e5389d9c33da0e0d70c66 
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_sync.h"
19
20namespace __tsan {
21
22#ifndef TSAN_HISTORY_SIZE  // in kibitraces
23#define TSAN_HISTORY_SIZE 128
24#endif
25
26const int kTracePartSize = 16 * 1024;
27const int kTraceParts = TSAN_HISTORY_SIZE * 1024 / kTracePartSize;
28const int kTraceSize = kTracePartSize * kTraceParts;
29
30// Must fit into 3 bits.
31enum EventType {
32  EventTypeMop,
33  EventTypeFuncEnter,
34  EventTypeFuncExit,
35  EventTypeLock,
36  EventTypeUnlock,
37  EventTypeRLock,
38  EventTypeRUnlock,
39};
40
41// Represents a thread event (from most significant bit):
42// u64 typ  : 3;   // EventType.
43// u64 addr : 61;  // Associated pc.
44typedef u64 Event;
45
46struct TraceHeader {
47  StackTrace stack0;  // Start stack for the trace.
48  u64        epoch0;  // Start epoch for the trace.
49#ifndef TSAN_GO
50  uptr       stack0buf[kTraceStackSize];
51#endif
52
53  TraceHeader()
54#ifndef TSAN_GO
55      : stack0(stack0buf, kTraceStackSize)
56#else
57      : stack0()
58#endif
59      , epoch0() {
60  }
61};
62
63struct Trace {
64  Event events[kTraceSize];
65  TraceHeader headers[kTraceParts];
66  Mutex mtx;
67
68  Trace()
69    : mtx(MutexTypeTrace, StatMtxTrace) {
70  }
71};
72
73}  // namespace __tsan
74
75#endif  // TSAN_TRACE_H
76