1// RUN: %clangxx_dfsan %s -fno-exceptions -o %t && %run %t
2// RUN: %clangxx_dfsan -DORIGIN_TRACKING -mllvm -dfsan-track-origins=1 %s -fno-exceptions -o %t && %run %t
3//
4// Use -fno-exceptions to turn off exceptions to avoid instrumenting
5// __cxa_begin_catch, std::terminate and __gxx_personality_v0.
6//
7// TODO: Support builtin atomics. For example, https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
8// DFSan instrumentation pass cannot identify builtin callsites yet.
9
10#include <sanitizer/dfsan_interface.h>
11
12#include <assert.h>
13#include <atomic>
14#include <pthread.h>
15
16std::atomic<int> atomic_i{0};
17
18struct arg_struct {
19 size_t index;
20 dfsan_origin origin;
21};
22
23static void *ThreadFn(void *arg) {
24 if (((arg_struct *)arg)->index % 2) {
25 int i = 10;
26 dfsan_set_label(label: 8, addr: (void *)&i, size: sizeof(i));
27 atomic_i.store(i, std::memory_order_relaxed);
28 return 0;
29 }
30 int j = atomic_i.load();
31 assert(dfsan_get_label(j) == 0 || dfsan_get_label(j) == 2);
32#ifdef ORIGIN_TRACKING
33 if (dfsan_get_label(j) == 2)
34 assert(dfsan_get_init_origin(&j) == ((arg_struct *)arg)->origin);
35#endif
36 return 0;
37}
38
39int main(void) {
40 int i = 10;
41 dfsan_set_label(label: 2, addr: (void *)&i, size: sizeof(i));
42#ifdef ORIGIN_TRACKING
43 dfsan_origin origin = dfsan_get_origin(i);
44#endif
45 atomic_i.store(i, std::memory_order_relaxed);
46 const int kNumThreads = 24;
47 pthread_t t[kNumThreads];
48 arg_struct args[kNumThreads];
49 for (int i = 0; i < kNumThreads; ++i) {
50 args[i].index = i;
51#ifdef ORIGIN_TRACKING
52 args[i].origin = origin;
53#endif
54 pthread_create(newthread: &t[i], attr: 0, start_routine: ThreadFn, arg: (void *)(args + i));
55 }
56 for (int i = 0; i < kNumThreads; ++i)
57 pthread_join(th: t[i], thread_return: 0);
58 return 0;
59}
60

source code of compiler-rt/test/dfsan/atomic.cpp