compiler-rt/test/msan/alloca.cpp

   1 // RUN: %clangxx_msan -O0 -g %s -o %t && %run %t
   2 // RUN: %clangxx_msan -O3 -g %s -o %t && %run %t
   3
   4 #include <assert.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <stdio.h>
   8 #include <sanitizer/msan_interface.h>
   9
  10 int main(void) {
  11   char *p = (char *)alloca(16);
  12   assert(0 == __msan_test_shadow(p, 16));
  13   assert(0 == __msan_test_shadow(p + 15, 1));
  14
  15   memset(p, 0, 16);
  16   assert(-1 == __msan_test_shadow(p, 16));
  17
  18   volatile int x = 0;
  19   char * volatile q = (char *)alloca(42 * x);
  20   assert(-1 == __msan_test_shadow(p, 16));
  21
  22   int r[x];
  23   int *volatile r2 = r;
  24   assert(-1 == __msan_test_shadow(p, 16));
  25 }