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111
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1 /* { dg-do run } */
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2 /* { dg-require-ifunc "" } */
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3 /* { dg-options "-Wno-pmf-conversions" } */
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4
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5 struct Klass
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6 {
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7 int a[4];
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8
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9 int implementation ();
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10 int magic ();
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11
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12 /* An ifunc resolver must return a pointer to an ordinary (non-member)
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13 function. To make it possible to use ifunc with member functions,
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14 the resolver must convert a member function pointer to an ordinary
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15 function pointer (slicing off the high word). */
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16 typedef int Func (Klass*);
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17
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18 static Func* resolver ();
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19 };
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20
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21 int Klass::implementation ()
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22 {
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23 __builtin_printf ("'ere I am JH\n");
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24 return a[0] + a[1] + a[2] + a[3];
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25 }
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26
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27 Klass::Func* Klass::resolver (void)
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28 {
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29 /* GCC guarantees this conversion to be safe and the resulting pointer
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30 usable to call the member function using ordinary (i.e., non-member)
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31 function call syntax. */
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32
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33 return reinterpret_cast<Func*>(&Klass::implementation);
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34 }
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35
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36 int f (void) __attribute__ ((ifunc ("foo")));
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37
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38 typedef int (F)(void);
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39 extern "C" F* foo () { return 0; }
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40
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41
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42 int Klass::magic () __attribute__ ((ifunc ("_ZN5Klass8resolverEv")));
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43
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44 int main ()
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45 {
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46 Klass obj;
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47
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48 obj.a[0] = 1;
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49 obj.a[1] = 2;
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50 obj.a[2] = 3;
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51 obj.a[3] = 4;
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52
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53 return !(obj.magic () == 10);
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54 }
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