1  #include <stdint.h>
       2  
       3  struct st
       4  {
       5    char buf[16];
       6    int32_t x;
       7    int32_t y;
       8  };
       9  
      10  struct st arr[10];
      11  
      12  int32_t struct_arr_read_x_element_before_start_far(void)
      13  {
      14    return arr[-100].x; /* { dg-warning "buffer under-read" "warning" } */
      15    /* { dg-message "out-of-bounds read from byte -2384 till byte -2381 but 'arr' starts at byte 0" "final event" { target *-*-* } .-1 } */
      16    /* { dg-message "valid subscripts for 'arr' are '\\\[0\\\]' to '\\\[9\\\]'" "valid subscript note" { target *-*-* } .-2 } */
      17  }
      18  
      19  int32_t struct_arr_read_x_element_before_start_near(void)
      20  {
      21    return arr[-2].x; /* { dg-warning "buffer under-read" "warning" } */
      22    /* { dg-message "out-of-bounds read from byte -32 till byte -29 but 'arr' starts at byte 0" "final event" { target *-*-* } .-1 } */
      23    /* { dg-message "valid subscripts for 'arr' are '\\\[0\\\]' to '\\\[9\\\]'" "valid subscript note" { target *-*-* } .-2 } */
      24  }
      25  
      26  int32_t struct_arr_read_x_element_before_start_off_by_one(void)
      27  {
      28    return arr[-1].x; /* { dg-warning "buffer under-read" "warning" } */
      29    /* { dg-message "out-of-bounds read from byte -8 till byte -5 but 'arr' starts at byte 0" "final event" { target *-*-* } .-1 } */
      30    /* { dg-message "valid subscripts for 'arr' are '\\\[0\\\]' to '\\\[9\\\]'" "valid subscript note" { target *-*-* } .-2 } */
      31  }
      32  
      33  int32_t struct_arr_read_x_element_at_start(void)
      34  {
      35    return arr[0].x;
      36  }
      37  
      38  int32_t struct_arr_read_x_element_at_end(void)
      39  {
      40    return arr[9].x;
      41  }
      42  
      43  int32_t struct_arr_read_x_element_after_end_off_by_one(void)
      44  {
      45    return arr[10].x; /* { dg-warning "buffer over-read" "warning" } */
      46    /* { dg-message "out-of-bounds read from byte 256 till byte 259 but 'arr' ends at byte 240" "final event" { target *-*-* } .-1 } */
      47    /* { dg-message "read of 4 bytes from after the end of 'arr'" "num bad bytes note" { target *-*-* } .-2 } */
      48    /* { dg-message "valid subscripts for 'arr' are '\\\[0\\\]' to '\\\[9\\\]'" "valid subscript note" { target *-*-* } .-3 } */
      49  }
      50  
      51  int32_t struct_arr_read_x_element_after_end_near(void)
      52  {
      53    return arr[11].x; /* { dg-warning "buffer over-read" "warning" } */
      54    /* { dg-message "out-of-bounds read from byte 280 till byte 283 but 'arr' ends at byte 240" "final event" { target *-*-* } .-1 } */
      55    /* { dg-message "read of 4 bytes from after the end of 'arr'" "num bad bytes note" { target *-*-* } .-2 } */
      56    /* { dg-message "valid subscripts for 'arr' are '\\\[0\\\]' to '\\\[9\\\]'" "valid subscript note" { target *-*-* } .-3 } */
      57  }
      58  
      59  int32_t struct_arr_read_x_element_after_end_far(void)
      60  {
      61    return arr[100].x; /* { dg-warning "buffer over-read" "warning" } */
      62    /* { dg-message "out-of-bounds read from byte 2416 till byte 2419 but 'arr' ends at byte 240" "final event" { target *-*-* } .-1 } */
      63    /* { dg-message "read of 4 bytes from after the end of 'arr'" "num bad bytes note" { target *-*-* } .-2 } */
      64    /* { dg-message "valid subscripts for 'arr' are '\\\[0\\\]' to '\\\[9\\\]'" "valid subscript note" { target *-*-* } .-3 } */
      65  }