1 // This test checks that the implementation of use-after-return
2 // is async-signal-safe.
3 // RUN: %clangxx_asan -std=c++11 -O1 %s -o %t -pthread && %run %t
4 // REQUIRES: stable-runtime
5 #include <signal.h>
6 #include <stdlib.h>
7 #include <stdio.h>
8 #include <sys/time.h>
9 #include <pthread.h>
10 #include <initializer_list>
11
12 int *g;
13 int n_signals;
14
15 typedef void (*Sigaction)(int, siginfo_t *, void *);
16
SignalHandler(int,siginfo_t *,void *)17 void SignalHandler(int, siginfo_t*, void*) {
18 int local;
19 g = &local;
20 n_signals++;
21 }
22
EnableSigprof(Sigaction SignalHandler)23 static void EnableSigprof(Sigaction SignalHandler) {
24 struct sigaction sa;
25 sa.sa_sigaction = SignalHandler;
26 sa.sa_flags = SA_RESTART | SA_SIGINFO;
27 sigemptyset(&sa.sa_mask);
28 if (sigaction(SIGPROF, &sa, NULL) != 0) {
29 perror("sigaction");
30 abort();
31 }
32 struct itimerval timer;
33 timer.it_interval.tv_sec = 0;
34 timer.it_interval.tv_usec = 1;
35 timer.it_value = timer.it_interval;
36 if (setitimer(ITIMER_PROF, &timer, 0) != 0) {
37 perror("setitimer");
38 abort();
39 }
40 }
41
RecursiveFunction(int depth)42 void RecursiveFunction(int depth) {
43 if (depth == 0) return;
44 int local;
45 g = &local;
46 // printf("r: %p\n", &local);
47 // printf("[%2d] n_signals: %d\n", depth, n_signals);
48 RecursiveFunction(depth - 1);
49 RecursiveFunction(depth - 1);
50 }
51
FastThread(void *)52 void *FastThread(void *) {
53 RecursiveFunction(1);
54 return NULL;
55 }
56
SlowThread(void *)57 void *SlowThread(void *) {
58 RecursiveFunction(1);
59 return NULL;
60 }
61
main(int argc,char ** argv)62 int main(int argc, char **argv) {
63 EnableSigprof(SignalHandler);
64
65 for (auto Thread : {&FastThread, &SlowThread}) {
66 for (int i = 0; i < 1000; i++) {
67 fprintf(stderr, ".");
68 const int kNumThread = sizeof(void*) == 8 ? 32 : 8;
69 pthread_t t[kNumThread];
70 for (int i = 0; i < kNumThread; i++)
71 pthread_create(&t[i], 0, Thread, 0);
72 for (int i = 0; i < kNumThread; i++)
73 pthread_join(t[i], 0);
74 }
75 fprintf(stderr, "\n");
76 }
77 }
78