modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/20170401-1.c (about)

     1  /* PR45070 */
     2  extern void abort(void);
     3  
     4  struct packed_ushort {
     5      unsigned short ucs;
     6  } __attribute__((packed));
     7  
     8  struct source {
     9      int pos, length;
    10  };
    11  
    12  static int flag;
    13  
    14  static void __attribute__((noinline)) fetch(struct source *p)
    15  {
    16      p->length = 128;
    17  }
    18      
    19  static struct packed_ushort __attribute__((noinline)) next(struct source *p)
    20  {
    21      struct packed_ushort rv;
    22  
    23      if (p->pos >= p->length) {
    24  	if (flag) {
    25  	    flag = 0;
    26  	    fetch(p);
    27  	    return next(p);
    28  	}
    29  	flag = 1;
    30  	rv.ucs = 0xffff;
    31  	return rv;
    32      }
    33      rv.ucs = 0;
    34      return rv;
    35  }
    36  
    37  int main(void)
    38  {
    39      struct source s;
    40      int i;
    41  
    42      s.pos = 0;
    43      s.length = 0;
    44      flag = 0;
    45  
    46      for (i = 0; i < 16; i++) {
    47  	struct packed_ushort rv = next(&s);
    48  	if ((i == 0 && rv.ucs != 0xffff)
    49  	    || (i > 0 && rv.ucs != 0))
    50  	    abort();
    51      }
    52      return 0;
    53  }