gcc/testsuite/gcc.dg/Wfree-nonheap-object-3.c

   1 /* PR ????? - No warning on attempts to access free object
   2    Verify that freeing unallocated objects referenced indirectly through
   3    pointers obtained from function calls is diagnosed.
   4    { dg-do compile }
   5    { dg-options "-O2 -Wall -Wfree-nonheap-object" }  */
   6
   7 typedef __SIZE_TYPE__ size_t;
   8
   9 extern void free (void*);
  10 extern char* memchr (const void*, int, size_t);
  11 extern char* strchr (const char*, int);
  12
  13 void sink (void*, ...);
  14
  15 extern char ecarr[];
  16 extern void* eparr[];
  17
  18 extern char *eptr;
  19
  20
  21 void warn_free_memchr_ecarr (int x, size_t n)
  22 {
  23   char *p = memchr (ecarr, x, n);
  24   sink (p);
  25   free (p);                   // { dg-warning "\\\[-Wfree-nonheap-object" }
  26 }
  27
  28 void warn_free_memchr_ecarr_offset (int i, int j, int x, size_t n)
  29 {
  30   char *p = memchr (ecarr + i, x, n);
  31   char *q = p + j;
  32   sink (p, q);
  33   free (q);                   // { dg-warning "\\\[-Wfree-nonheap-object" }
  34 }
  35
  36
  37 void warn_free_memchr_local_arr (int x, size_t n)
  38 {
  39   char a[8];
  40   sink (a);
  41
  42   char *p = memchr (a, x, n);
  43   sink (p);
  44   free (p);                   // { dg-warning "\\\[-Wfree-nonheap-object" }
  45 }
  46
  47 void warn_free_memchr_local_arr_offset (int i, int j, int x, size_t n)
  48 {
  49   char a[8];
  50   sink (a);
  51
  52   char *p = memchr (a + i, x, n);
  53   char *q = p + j;
  54   sink (p, q);
  55   free (q);                   // { dg-warning "\\\[-Wfree-nonheap-object" }
  56 }
  57