1  /* This tests that when faced with two references to the same memory
       2     location in the same basic block, the second reference should not
       3     be instrumented by the Address Sanitizer.  */
       4  
       5  /* { dg-options "-fdump-tree-sanopt" } */
       6  /* { dg-do compile } */
       7  /* { dg-skip-if "" { *-*-* } { "*" } { "-O0" } } */
       8  
       9  extern char tab[6];
      10  
      11  static int
      12  test0 ()
      13  {
      14    /* __builtin___asan_report_store1 called 2 times for the two stores
      15       below.  */
      16    tab[0] = 1;
      17    tab[1] = 2;
      18  
      19    /* This load should not be instrumented because it is to the same
      20       memory location as above.  */
      21    char t0 = tab[1];
      22  
      23    /* Likewise.  */
      24    char t1 = tab[1];
      25  
      26    return t0 + t1;
      27  }
      28  
      29  __attribute__((noinline, noclone)) static int
      30  test1 (int i)
      31  {
      32    char foo[4] = {};
      33    
      34    /*__builtin___asan_report_store1 called 1 time here to instrument
      35      the initialization.  */
      36    foo[i] = 1;
      37  
      38    /* Instrument tab memory region.  */
      39    __builtin_memset (tab, 3, sizeof (tab));
      40  
      41    /* Instrument tab[1] with access size 3.  */
      42    __builtin_memcpy (&tab[1], foo + i, 3);
      43  
      44    /* This should not generate a __builtin___asan_report_load1 because
      45       the reference to tab[1] has been already instrumented above.  */
      46    return tab[1];
      47  
      48    /* So for these functions, there should be 3 calls to
      49       __builtin___asan_report_store1.  */
      50  }
      51  
      52  int
      53  main ()
      54  {
      55    return test0 () && test1 (0);
      56  }
      57  
      58  /* { dg-final { scan-tree-dump-times "__builtin___asan_report_store1" 3 "sanopt" } } */
      59  /* { dg-final { scan-tree-dump-not "__builtin___asan_report_load1" "sanopt" } } */