compiler-rt/test/tsan/simple_stack2.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
   2 #include "test.h"
   3
   4 int Global;
   5
   6 void __attribute__((noinline)) foo1() {
   7   Global = 42;
   8 }
   9
  10 void __attribute__((noinline)) bar1() {
  11   volatile int tmp = 42;
  12   int tmp2 = tmp;
  13   (void)tmp2;
  14   foo1();
  15 }
  16
  17 void __attribute__((noinline)) foo2() {
  18   volatile int tmp = Global;
  19   int tmp2 = tmp;
  20   (void)tmp2;
  21 }
  22
  23 void __attribute__((noinline)) bar2() {
  24   volatile int tmp = 42;
  25   int tmp2 = tmp;
  26   (void)tmp2;
  27   foo2();
  28 }
  29
  30 void *Thread1(void *x) {
  31   barrier_wait(&barrier);
  32   bar1();
  33   return NULL;
  34 }
  35
  36 int main() {
  37   barrier_init(&barrier, 2);
  38   pthread_t t;
  39   pthread_create(&t, NULL, Thread1, NULL);
  40   bar2();
  41   barrier_wait(&barrier);
  42   pthread_join(t, NULL);
  43 }
  44
  45 // CHECK:      WARNING: ThreadSanitizer: data race
  46 // CHECK-NEXT:   Write of size 4 at {{.*}} by thread T1:
  47 // CHECK-NEXT:     #0 foo1{{.*}} {{.*}}simple_stack2.cpp:[[@LINE-40]]{{(:10)?}} ({{.*}})
  48 // CHECK-NEXT:     #1 bar1{{.*}} {{.*}}simple_stack2.cpp:[[@LINE-34]]{{(:3)?}} ({{.*}})
  49 // CHECK-NEXT:     #2 Thread1{{.*}} {{.*}}simple_stack2.cpp:[[@LINE-17]]{{(:3)?}} ({{.*}})
  50 // CHECK:        Previous read of size 4 at {{.*}} by main thread:
  51 // CHECK-NEXT:     #0 foo2{{.*}} {{.*}}simple_stack2.cpp:[[@LINE-33]]{{(:22)?}} ({{.*}})
  52 // CHECK-NEXT:     #1 bar2{{.*}} {{.*}}simple_stack2.cpp:[[@LINE-25]]{{(:3)?}} ({{.*}})
  53 // CHECK-NEXT:     #2 main{{.*}} {{.*}}simple_stack2.cpp:[[@LINE-13]]{{(:3)?}} ({{.*}})