| // Copyright (C) 2005 Free Software Foundation, Inc. |
| // Contributed by Nathan Sidwell 4 Apr 2005 <nathan@codesourcery.com> |
| // Re-purposed to check for re-rurgesnce of PR 89693 in 2019. |
| |
| // { dg-do compile } |
| // { dg-options "-O3 -fno-ipa-icf-functions" } |
| |
| // Origin: yanliu@ca.ibm.com |
| // nathan@codesourcery.com |
| |
| struct A { |
| virtual void One (); |
| }; |
| struct B { |
| virtual B *Two (); |
| virtual B &Three (); |
| }; |
| |
| struct C : A, B |
| { |
| virtual C *Two (); |
| virtual C &Three (); |
| }; |
| void A::One () {} |
| B *B::Two() {return this;} |
| B &B::Three() {return *this;} |
| C *C::Two () {return 0;} |
| C &C::Three () {return *(C *)0;} |
| |
| B *Foo (B *b) |
| { |
| return b->Two (); |
| } |
| |
| B &Bar (B *b) |
| { |
| return b->Three (); |
| } |
| |
| int main () |
| { |
| C c; |
| |
| /* We should not adjust a null pointer. */ |
| if (Foo (&c)) |
| return 1; |
| /* But we should adjust a (bogus) null reference. */ |
| if (!&Bar (&c)) |
| return 2; |
| |
| return 0; |
| } |