gcc/testsuite/gcc.dg/strlenopt-8.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -fdump-tree-strlen" } */
   3
   4 #include "strlenopt.h"
   5
   6 /* Yes, there are people who write code like this.  */
   7
   8 __attribute__((noinline, noclone)) char *
   9 foo (int r)
  10 {
  11   char buf[10] = "";
  12   strcat (buf, r ? "r" : "w");
  13   strcat (buf, "b");
  14   return strdup (buf);
  15 }
  16
  17 __attribute__((noinline, noclone)) char *
  18 bar (int r)
  19 {
  20   char buf[10] = {};
  21   strcat (buf, r ? "r" : "w");
  22   strcat (buf, "b");
  23   return strdup (buf);
  24 }
  25
  26 int
  27 main ()
  28 {
  29   char *q = foo (1);
  30   if (q != NULL)
  31     {
  32       if (strcmp (q, "rb"))
  33         abort ();
  34       free (q);
  35     }
  36   q = bar (0);
  37   if (q != NULL)
  38     {
  39       if (strcmp (q, "wb"))
  40         abort ();
  41       free (q);
  42     }
  43   return 0;
  44 }
  45
  46 /* On non-strict-align targets we inline the memcpy that strcat is turned
  47    into and end up with a short typed load / store which strlenopt is not
  48    able to analyze.  */
  49
  50 /* { dg-final { scan-tree-dump-times "strlen \\(" 0 "strlen" { xfail non_strict_align } } } */
  51 /* { dg-final { scan-tree-dump-times "memcpy \\(" 2 "strlen" { target { non_strict_align } } } } */
  52 /* { dg-final { scan-tree-dump-times "memcpy \\(" 4 "strlen" { target { ! non_strict_align } } } }  */
  53 /* { dg-final { scan-tree-dump-times "strcpy \\(" 0 "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" } } */