elf/ifuncmain7.c

   1 /* Test local STT_GNU_IFUNC symbols:
   2
   3    1. Direct function call.
   4    2. Function pointer.
   5  */
   6
   7 #include <stdlib.h>
   8
   9 extern int foo (void);
  10
  11 static int
  12 one (void)
  13 {
  14   return -30;
  15 }
  16
  17 static void * foo_ifunc (void) __asm__ ("foo");
  18 __asm__(".type foo, %gnu_indirect_function");
  19
  20 static void *
  21 __attribute__ ((used))
  22 foo_ifunc (void)
  23 {
  24   return one;
  25 }
  26
  27 typedef int (*foo_p) (void);
  28
  29 foo_p foo_ptr = foo;
  30
  31 foo_p
  32 __attribute__ ((noinline))
  33 get_foo_p (void)
  34 {
  35   return foo_ptr;
  36 }
  37
  38 foo_p
  39 __attribute__ ((noinline))
  40 get_foo (void)
  41 {
  42   return foo;
  43 }
  44
  45 int
  46 main (void)
  47 {
  48   foo_p p;
  49
  50   p = get_foo ();
  51   if (p != foo)
  52     abort ();
  53   if ((*p) () != -30)
  54     abort ();
  55
  56   p = get_foo_p ();
  57   if (p != foo)
  58     abort ();
  59   if ((*p) () != -30)
  60     abort ();
  61
  62   if (foo_ptr != foo)
  63     abort ();
  64   if ((*foo_ptr) () != -30)
  65     abort ();
  66   if (foo () != -30)
  67     abort ();
  68
  69   return 0;
  70 }