gold/testsuite/ifuncmain3.c

   1 /* Test STT_GNU_IFUNC symbols with dlopen:
   2
   3    1. Direct function call.
   4    2. Function pointer.
   5    3. Visibility with override.
   6  */
   7
   8 #include <dlfcn.h>
   9 #include <stdlib.h>
  10 #include <stdio.h>
  11
  12 extern int __attribute__ ((noinline)) foo (void);
  13 extern int __attribute__ ((noinline)) foo_hidden (void);
  14 extern int __attribute__ ((noinline)) foo_protected (void);
  15
  16 typedef int (*foo_p) (void);
  17
  18 int
  19 __attribute__ ((noinline))
  20 foo (void)
  21 {
  22   return -30;
  23 }
  24
  25 int
  26 __attribute__ ((noinline))
  27 foo_hidden (void)
  28 {
  29   return -20;
  30 }
  31
  32 int
  33 __attribute__ ((noinline))
  34 foo_protected (void)
  35 {
  36   return -40;
  37 }
  38
  39 int
  40 main (void)
  41 {
  42   foo_p p;
  43   foo_p (*f) (void);
  44   int *ret;
  45
  46   void *h = dlopen ("ifuncmod3.so", RTLD_LAZY);
  47   if (h == NULL)
  48     {
  49       printf ("cannot load: %s\n", dlerror ());
  50       return 1;
  51     }
  52
  53   p = dlsym (h, "foo");
  54   if (p == NULL)
  55     {
  56       printf ("symbol not found: %s\n", dlerror ());
  57       return 1;
  58     }
  59   if ((*p) () != -1)
  60     abort ();
  61
  62   f = dlsym (h, "get_foo_p");
  63   if (f == NULL)
  64     {
  65       printf ("symbol not found: %s\n", dlerror ());
  66       return 1;
  67     }
  68
  69   ret = dlsym (h, "ret_foo");
  70   if (ret == NULL)
  71     {
  72       printf ("symbol not found: %s\n", dlerror ());
  73       return 1;
  74     }
  75
  76   p = (*f) ();
  77   if (p != foo)
  78     abort ();
  79   if (foo () != -30)
  80     abort ();
  81   if (*ret != -30 || (*p) () != *ret)
  82     abort ();
  83
  84   f = dlsym (h, "get_foo_hidden_p");
  85   if (f == NULL)
  86     {
  87       printf ("symbol not found: %s\n", dlerror ());
  88       return 1;
  89     }
  90
  91   ret = dlsym (h, "ret_foo_hidden");
  92   if (ret == NULL)
  93     {
  94       printf ("symbol not found: %s\n", dlerror ());
  95       return 1;
  96     }
  97
  98   p = (*f) ();
  99   if (foo_hidden () != -20)
 100     abort ();
 101   if (*ret != 1 || (*p) () != *ret)
 102     abort ();
 103
 104   f = dlsym (h, "get_foo_protected_p");
 105   if (f == NULL)
 106     {
 107       printf ("symbol not found: %s\n", dlerror ());
 108       return 1;
 109     }
 110
 111   ret = dlsym (h, "ret_foo_protected");
 112   if (ret == NULL)
 113     {
 114       printf ("symbol not found: %s\n", dlerror ());
 115       return 1;
 116     }
 117
 118   p = (*f) ();
 119   if (p == foo_protected)
 120     abort ();
 121   if (foo_protected () != -40)
 122     abort ();
 123   if (*ret != 0 || (*p) () != *ret)
 124     abort ();
 125
 126   if (dlclose (h) != 0)
 127     {
 128       printf ("cannot close: %s\n", dlerror ());
 129       return 1;
 130     }
 131
 132   return 0;
 133 }