Viewing file:  attr-ifunc-1.C (1.16 KB) -rw-r--r--
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/* { dg-do run } */
/* { dg-require-ifunc "" } */
/* { dg-options "-Wno-pmf-conversions" } */
struct Klass
{
int a[4];
int implementation ();
int magic ();
/* An ifunc resolver must return a pointer to an ordinary (non-member)
function. To make it possible to use ifunc with member functions,
the resolver must convert a member function pointer to an ordinary
function pointer (slicing off the high word). */
typedef int Func (Klass*);
static Func* resolver ();
};
int Klass::implementation ()
{
__builtin_printf ("'ere I am JH\n");
return a[0] + a[1] + a[2] + a[3];
}
Klass::Func* Klass::resolver (void)
{
/* GCC guarantees this conversion to be safe and the resulting pointer
usable to call the member function using ordinary (i.e., non-member)
function call syntax. */
return reinterpret_cast<Func*>(&Klass::implementation);
}
int f (void) __attribute__ ((ifunc ("foo")));
typedef int (F)(void);
extern "C" F* foo () { return 0; }
int Klass::magic () __attribute__ ((ifunc ("_ZN5Klass8resolverEv")));
int main ()
{
Klass obj;
obj.a[0] = 1;
obj.a[1] = 2;
obj.a[2] = 3;
obj.a[3] = 4;
return !(obj.magic () == 10);
}
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