dynamic_annotations.cc
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1 // Copyright 2017 The Abseil Authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 #include <stdlib.h>
16 #include <string.h>
17 
19 
20 #ifndef __has_feature
21 #define __has_feature(x) 0
22 #endif
23 
24 /* Compiler-based ThreadSanitizer defines
25  DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL = 1
26  and provides its own definitions of the functions. */
27 
28 #ifndef DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL
29 # define DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL 0
30 #endif
31 
32 /* Each function is empty and called (via a macro) only in debug mode.
33  The arguments are captured by dynamic tools at runtime. */
34 
35 #if DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL == 0 && !defined(__native_client__)
36 
37 #if __has_feature(memory_sanitizer)
38 #include <sanitizer/msan_interface.h>
39 #endif
40 
41 #ifdef __cplusplus
42 extern "C" {
43 #endif
44 
45 void AnnotateRWLockCreate(const char *, int,
46  const volatile void *){}
47 void AnnotateRWLockDestroy(const char *, int,
48  const volatile void *){}
49 void AnnotateRWLockAcquired(const char *, int,
50  const volatile void *, long){}
51 void AnnotateRWLockReleased(const char *, int,
52  const volatile void *, long){}
53 void AnnotateBenignRace(const char *, int,
54  const volatile void *,
55  const char *){}
56 void AnnotateBenignRaceSized(const char *, int,
57  const volatile void *,
58  size_t,
59  const char *) {}
60 void AnnotateThreadName(const char *, int,
61  const char *){}
62 void AnnotateIgnoreReadsBegin(const char *, int){}
63 void AnnotateIgnoreReadsEnd(const char *, int){}
64 void AnnotateIgnoreWritesBegin(const char *, int){}
65 void AnnotateIgnoreWritesEnd(const char *, int){}
66 void AnnotateEnableRaceDetection(const char *, int, int){}
67 void AnnotateMemoryIsInitialized(const char *, int,
68  const volatile void *mem, size_t size) {
69 #if __has_feature(memory_sanitizer)
70  __msan_unpoison(mem, size);
71 #else
72  (void)mem;
73  (void)size;
74 #endif
75 }
76 
77 void AnnotateMemoryIsUninitialized(const char *, int,
78  const volatile void *mem, size_t size) {
79 #if __has_feature(memory_sanitizer)
80  __msan_allocated_memory(mem, size);
81 #else
82  (void)mem;
83  (void)size;
84 #endif
85 }
86 
87 static int GetRunningOnValgrind(void) {
88 #ifdef RUNNING_ON_VALGRIND
89  if (RUNNING_ON_VALGRIND) return 1;
90 #endif
91  char *running_on_valgrind_str = getenv("RUNNING_ON_VALGRIND");
92  if (running_on_valgrind_str) {
93  return strcmp(running_on_valgrind_str, "0") != 0;
94  }
95  return 0;
96 }
97 
98 /* See the comments in dynamic_annotations.h */
99 int RunningOnValgrind(void) {
100  static volatile int running_on_valgrind = -1;
101  int local_running_on_valgrind = running_on_valgrind;
102  /* C doesn't have thread-safe initialization of statics, and we
103  don't want to depend on pthread_once here, so hack it. */
104  ANNOTATE_BENIGN_RACE(&running_on_valgrind, "safe hack");
105  if (local_running_on_valgrind == -1)
106  running_on_valgrind = local_running_on_valgrind = GetRunningOnValgrind();
107  return local_running_on_valgrind;
108 }
109 
110 /* See the comments in dynamic_annotations.h */
111 double ValgrindSlowdown(void) {
112  /* Same initialization hack as in RunningOnValgrind(). */
113  static volatile double slowdown = 0.0;
114  double local_slowdown = slowdown;
115  ANNOTATE_BENIGN_RACE(&slowdown, "safe hack");
116  if (RunningOnValgrind() == 0) {
117  return 1.0;
118  }
119  if (local_slowdown == 0.0) {
120  char *env = getenv("VALGRIND_SLOWDOWN");
121  slowdown = local_slowdown = env ? atof(env) : 50.0;
122  }
123  return local_slowdown;
124 }
125 
126 #ifdef __cplusplus
127 } // extern "C"
128 #endif
129 #endif /* DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL == 0 */
void AnnotateIgnoreWritesBegin(const char *, int)
void AnnotateRWLockReleased(const char *, int, const volatile void *, long)
#define ANNOTATE_BENIGN_RACE(address, description)
static int GetRunningOnValgrind(void)
void AnnotateIgnoreReadsEnd(const char *, int)
void AnnotateIgnoreWritesEnd(const char *, int)
void AnnotateThreadName(const char *, int, const char *)
void AnnotateBenignRaceSized(const char *, int, const volatile void *, size_t, const char *)
uintptr_t size
void AnnotateBenignRace(const char *, int, const volatile void *, const char *)
double ValgrindSlowdown(void)
void AnnotateMemoryIsInitialized(const char *, int, const volatile void *mem, size_t size)
void AnnotateMemoryIsUninitialized(const char *, int, const volatile void *mem, size_t size)
void AnnotateEnableRaceDetection(const char *, int, int)
void AnnotateIgnoreReadsBegin(const char *, int)
void AnnotateRWLockAcquired(const char *, int, const volatile void *, long)
int RunningOnValgrind(void)
void AnnotateRWLockDestroy(const char *, int, const volatile void *)
void AnnotateRWLockCreate(const char *, int, const volatile void *)


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autogenerated on Wed Jun 19 2019 19:19:56