gcc/testsuite/gcc.c-torture/execute/string-opt-9.c

   1 /* Copyright (C) 2000  Free Software Foundation.
   2
   3    Ensure all expected transformations of builtin strcat occur and
   4    perform correctly.
   5
   6    Written by Kaveh R. Ghazi, 11/27/2000.  */
   7
   8 extern void abort (void);
   9 typedef __SIZE_TYPE__ size_t;
  10 extern char *strcat (char *, const char *);
  11 extern char *strcpy (char *, const char *);
  12 extern char *strcmp (const char *, const char *);
  13
  14 int main ()
  15 {
  16   const char *const s1 = "hello world";
  17   const char *const s2 = "";
  18   char dst[64], *d2;
  19
  20   strcpy (dst, s1);
  21   if (strcat (dst, "") != dst || strcmp (dst, s1))
  22     abort();
  23   strcpy (dst, s1);
  24   if (strcat (dst, s2) != dst || strcmp (dst, s1))
  25     abort();
  26   strcpy (dst, s1); d2 = dst;
  27   if (strcat (++d2, s2) != dst+1 || d2 != dst+1 || strcmp (dst, s1))
  28     abort();
  29   strcpy (dst, s1); d2 = dst;
  30   if (strcat (++d2+5, s2) != dst+6 || d2 != dst+1 || strcmp (dst, s1))
  31     abort();
  32   strcpy (dst, s1); d2 = dst;
  33   if (strcat (++d2+5, s1+11) != dst+6 || d2 != dst+1 || strcmp (dst, s1))
  34     abort();
  35
  36   /* Test at least one instance of the __builtin_ style.  We do this
  37      to ensure that it works and that the prototype is correct.  */
  38   strcpy (dst, s1);
  39   if (__builtin_strcat (dst, "") != dst || strcmp (dst, s1))
  40     abort();
  41
  42   return 0;
  43 }
  44
  45 #ifdef __OPTIMIZE__
  46 /* When optimizing, all the above cases should be transformed into
  47    something else.  So any remaining calls to the original function
  48    should abort.  */
  49 __attribute__ ((noinline))
  50 static char *
  51 strcat (char *s1, const char *s2)
  52 {
  53   abort();
  54 }
  55 #endif