[cfe-dev] CGRecordLayoutBuilder for Microsoft layout.

[r4start]

On 22/10/2011 23:43, r4start wrote:
> On 22/10/2011 03:12, Eli Friedman wrote:
>> As for the CodeGen bits, they look more complicated than they should
>> be;
> You add vfptroffset it will be very helpful, I'll try to make my code 
> simpler.
>>   as far as I can tell, the current CodeGen bits are doing the right
>> thing right now,
> Not quite, for example (class D & G from test code)
> struct H : public G,
>            public virtual D
> {
>     virtual ~H(){}
> };
> code in svn will built
>     0 | struct H
>     0 |   struct G (base)
>     0 |     int g_field
>     4 |   (H vftable pointer)
>     8 |   (H vbtable pointer)
>   16 |   class D (virtual base)
>   16 |     (D vftable pointer)
>   24 |     double a
> %struct.H = type { %struct.G, [12 x i8], %class.D }
>
> but right layout is
>     0 | struct H
>     0 |   (H vtable pointer)
>     8 |   (H vbtable pointer)
>     4 |   struct G (base)
>     4 |     int g_field
>   16 |   class D (virtual base)
>   16 |     (D vtable pointer)
>   24 |     double a
> %struct.H = type { i32 (...)**, %struct.G, i32*, [4 x i8], %class.D } or
> %struct.H = type { [4 x i8], %struct.G, [8 x i8], %class.D }
>
> So all complicated code needs only for microsoft "madness" like this.
> About example,  I'll fix it in few days and publish patch.
>
This patch fixes the bug.

  - Dmitry.

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