test/msan/cxa_atexit.cc

   1 // RUN: %clangxx_msan -m64 -O0 %s -o %t && %run %t %p
   2
   3 // PR17377: C++ module destructors get stale argument shadow.
   4
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 class A {
   8 public:
   9   // This destructor get stale argument shadow left from the call to f().
  10   ~A() {
  11     if (this)
  12       exit(0);
  13   }
  14 };
  15
  16 A a;
  17
  18 __attribute__((noinline))
  19 void f(long x) {
  20 }
  21
  22 int main(void) {
  23   long  x;
  24   long * volatile p = &x;
  25   // This call poisons TLS shadow for the first function argument.
  26   f(*p);
  27   return 0;
  28 }