1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
//===-- tsan_suppressions.cc ----------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer (TSan), a race detector.
//
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_libc.h"
#include "sanitizer_common/sanitizer_placement_new.h"
#include "sanitizer_common/sanitizer_suppressions.h"
#include "tsan_suppressions.h"
#include "tsan_rtl.h"
#include "tsan_flags.h"
#include "tsan_mman.h"
#include "tsan_platform.h"
// Suppressions for true/false positives in standard libraries.
static const char *const std_suppressions =
// Libstdc++ 4.4 has data races in std::string.
// See http://crbug.com/181502 for an example.
"race:^_M_rep$\n"
"race:^_M_is_leaked$\n"
// False positive when using std <thread>.
// Happens because we miss atomic synchronization in libstdc++.
// See http://llvm.org/bugs/show_bug.cgi?id=17066 for details.
"race:std::_Sp_counted_ptr_inplace<std::thread::_Impl\n";
// Can be overriden in frontend.
#ifndef TSAN_GO
extern "C" const char *WEAK __tsan_default_suppressions() {
return 0;
}
#endif
namespace __tsan {
static SuppressionContext* g_ctx;
static char *ReadFile(const char *filename) {
if (filename == 0 || filename[0] == 0)
return 0;
InternalScopedBuffer<char> tmp(4*1024);
if (filename[0] == '/' || GetPwd() == 0)
internal_snprintf(tmp.data(), tmp.size(), "%s", filename);
else
internal_snprintf(tmp.data(), tmp.size(), "%s/%s", GetPwd(), filename);
uptr openrv = OpenFile(tmp.data(), false);
if (internal_iserror(openrv)) {
Printf("ThreadSanitizer: failed to open suppressions file '%s'\n",
tmp.data());
Die();
}
fd_t fd = openrv;
const uptr fsize = internal_filesize(fd);
if (fsize == (uptr)-1) {
Printf("ThreadSanitizer: failed to stat suppressions file '%s'\n",
tmp.data());
Die();
}
char *buf = (char*)internal_alloc(MBlockSuppression, fsize + 1);
if (fsize != internal_read(fd, buf, fsize)) {
Printf("ThreadSanitizer: failed to read suppressions file '%s'\n",
tmp.data());
Die();
}
internal_close(fd);
buf[fsize] = 0;
return buf;
}
void InitializeSuppressions() {
ALIGNED(64) static char placeholder_[sizeof(SuppressionContext)];
g_ctx = new(placeholder_) SuppressionContext;
const char *supp = ReadFile(flags()->suppressions);
g_ctx->Parse(supp);
#ifndef TSAN_GO
supp = __tsan_default_suppressions();
g_ctx->Parse(supp);
g_ctx->Parse(std_suppressions);
#endif
}
SuppressionContext *GetSuppressionContext() {
CHECK_NE(g_ctx, 0);
return g_ctx;
}
SuppressionType conv(ReportType typ) {
if (typ == ReportTypeRace)
return SuppressionRace;
else if (typ == ReportTypeVptrRace)
return SuppressionRace;
else if (typ == ReportTypeUseAfterFree)
return SuppressionRace;
else if (typ == ReportTypeThreadLeak)
return SuppressionThread;
else if (typ == ReportTypeMutexDestroyLocked)
return SuppressionMutex;
else if (typ == ReportTypeMutexDoubleLock)
return SuppressionMutex;
else if (typ == ReportTypeMutexBadUnlock)
return SuppressionMutex;
else if (typ == ReportTypeMutexBadReadLock)
return SuppressionMutex;
else if (typ == ReportTypeMutexBadReadUnlock)
return SuppressionMutex;
else if (typ == ReportTypeSignalUnsafe)
return SuppressionSignal;
else if (typ == ReportTypeErrnoInSignal)
return SuppressionNone;
else if (typ == ReportTypeDeadlock)
return SuppressionDeadlock;
Printf("ThreadSanitizer: unknown report type %d\n", typ),
Die();
}
uptr IsSuppressed(ReportType typ, const ReportStack *stack, Suppression **sp) {
CHECK(g_ctx);
if (!g_ctx->SuppressionCount() || stack == 0 || !stack->suppressable)
return 0;
SuppressionType stype = conv(typ);
if (stype == SuppressionNone)
return 0;
Suppression *s;
for (const ReportStack *frame = stack; frame; frame = frame->next) {
if (g_ctx->Match(frame->func, stype, &s) ||
g_ctx->Match(frame->file, stype, &s) ||
g_ctx->Match(frame->module, stype, &s)) {
DPrintf("ThreadSanitizer: matched suppression '%s'\n", s->templ);
s->hit_count++;
*sp = s;
return frame->pc;
}
}
return 0;
}
uptr IsSuppressed(ReportType typ, const ReportLocation *loc, Suppression **sp) {
CHECK(g_ctx);
if (!g_ctx->SuppressionCount() || loc == 0 ||
loc->type != ReportLocationGlobal || !loc->suppressable)
return 0;
SuppressionType stype = conv(typ);
if (stype == SuppressionNone)
return 0;
Suppression *s;
if (g_ctx->Match(loc->name, stype, &s) ||
g_ctx->Match(loc->file, stype, &s) ||
g_ctx->Match(loc->module, stype, &s)) {
DPrintf("ThreadSanitizer: matched suppression '%s'\n", s->templ);
s->hit_count++;
*sp = s;
return loc->addr;
}
return 0;
}
void PrintMatchedSuppressions() {
CHECK(g_ctx);
InternalMmapVector<Suppression *> matched(1);
g_ctx->GetMatched(&matched);
if (!matched.size())
return;
int hit_count = 0;
for (uptr i = 0; i < matched.size(); i++)
hit_count += matched[i]->hit_count;
Printf("ThreadSanitizer: Matched %d suppressions (pid=%d):\n", hit_count,
(int)internal_getpid());
for (uptr i = 0; i < matched.size(); i++) {
Printf("%d %s:%s\n", matched[i]->hit_count,
SuppressionTypeString(matched[i]->type), matched[i]->templ);
}
}
} // namespace __tsan
|
