[cfe-dev] Microsoft vtordisp field support for clang.

[r4start]

On 14/02/2012 15:34, r4start wrote:
> On 14/02/2012 05:06, John McCall wrote:
>> class A { virtual void foo(); } class B : public A { }; class C : 
>> public virtual B { C(); virtual void foo(); }; 
> For this test we will get next result:
>   class C    size(12):
>         +---
>   0    | {vbptr}
>         +---
>   4    | (vtordisp for vbase B)
>         +--- (virtual base B)
>         | +--- (base class A)
>   8    | | {vfptr}
>         | +---
>         +---
> If somewhere in inheritance path class has declare ctor or dtor and 
> overload virtual method from virtual base,
> then before virtual base Microsoft compiler push vtordisp in layout.
>
Also for this test case:

class A { virtual void foo(){} };
class B : public A { };
class C : public virtual B { C(){} virtual void foo(){} };
class D : public C { int qqq; };

   class D    size(16):
          +---
          | +--- (base class C)
    0    | | {vbptr}
          | +---
    4    | qqq
          +---
    8    | (vtordisp for vbase B)
          +--- (virtual base B)
          | +--- (base class A)
   12   | | {vfptr}
          | +---
          +---
As you can see D also has vtordisp for B.

  - Dmitry.