gcc/testsuite/gcc.dg/strlenopt-5.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -fdump-tree-strlen" } */
   3
   4 #include "strlenopt.h"
   5
   6 __attribute__((noinline, noclone)) char *
   7 foo (char *p, const char *q)
   8 {
   9   char *e = strchr (p, '\0');
  10   strcat (p, q);
  11   return e;
  12 }
  13
  14 __attribute__((noinline, noclone)) char *
  15 bar (char *p)
  16 {
  17   memcpy (p, "abcd", 5);
  18   return strchr (p, '\0');
  19 }
  20
  21 __attribute__((noinline, noclone)) void
  22 baz (char *p)
  23 {
  24   char *e = strchr (p, '\0');
  25   strcat (e, "abcd");
  26 }
  27
  28 char buf[64];
  29
  30 int
  31 main ()
  32 {
  33   char *volatile p = buf;
  34   const char *volatile q = "ij";
  35   memset (buf, 'v', 3);
  36   if (foo (p, q) != buf + 3
  37       || memcmp (buf, "vvvij\0\0\0\0", 10) != 0)
  38     abort ();
  39   memset (buf, '\0', sizeof buf);
  40   if (bar (p) != buf + 4
  41       || memcmp (buf, "abcd\0\0\0\0\0", 10) != 0)
  42     abort ();
  43   memset (buf, 'v', 2);
  44   memset (buf + 2, '\0', -2 + sizeof buf);
  45   baz (p);
  46   if (memcmp (buf, "vvabcd\0\0\0", 10) != 0)
  47     abort ();
  48   return 0;
  49 }
  50
  51 /* { dg-final { scan-tree-dump-times "strlen \\(" 2 "strlen" } } */
  52 /* { dg-final { scan-tree-dump-times "memcpy \\(" 2 "strlen" } } */
  53 /* { dg-final { scan-tree-dump-times "strcpy \\(" 1 "strlen" } } */
  54 /* { dg-final { scan-tree-dump-times "strcat \\(" 0 "strlen" } } */
  55 /* { dg-final { scan-tree-dump-times "strchr \\(" 0 "strlen" } } */
  56 /* { dg-final { scan-tree-dump-times "stpcpy \\(" 0 "strlen" } } */