test/sharing3.c

   1 extern /*@only@*/ char *string_copyext (char *s) ;
   2
   3 void f (void)
   4 {
   5   char *s;
   6
   7   if (3 < 4)
   8     {
   9       s = string_copyext ("asdf");
  10       free (s);
  11     }
  12 }
  13
  14
  15 /*@only@*/ char *string_copy (char *s)
  16 {
  17   return s; /* 1. returns temp as only! */
  18 }
  19
  20 /*@only@*/ char *copy_string1 (char *s)
  21 {
  22   return string_copy (s); /* okay */
  23 }
  24
  25 /*@only@*/ char *copy_string2 (char *s)
  26 {
  27   return string_copyext (s); /* okay */
  28 }
  29
  30 void string_free1 (char *s)
  31 {
  32   free (s); /* 2. unqualified as only */
  33 }
  34
  35 void string_free2 (/*@only@*/ char *s)
  36 {
  37   free (s);
  38 }
  39
  40 void string_free3 (/*@only@*/ char *s)
  41 {
  42   char *t = string_copy (s);
  43   string_free2 (s);
  44   *t = 'a';
  45 } /* 3. bad, t not released */
  46
  47 void string_free4 (/*@only@*/ char *s)
  48 {
  49   char *t;
  50   int i;
  51
  52   for (i = 0; i < 3; i++)
  53     {
  54       t = string_copy (s);
  55       *t = 'a';
  56       free (t);
  57     }
  58
  59   free (s);
  60 } /* okay */
  61