Re: [Qemu-devel] [PATCH 27/28] sysbus: apic: ioapic: convert to QEMU Object Model

[Andreas Färber]

Am 25.01.2012 15:40, schrieb Anthony Liguori:
> On 01/25/2012 08:23 AM, Jan Kiszka wrote:
>> On 2012-01-25 15:00, Anthony Liguori wrote:
>>> On 01/25/2012 02:37 AM, Jan Kiszka wrote:
>>>> On 2012-01-25 00:03, Anthony Liguori wrote:
>>>>> They're exactly the same size (16 lines).  If you embed TypeInfo into
>>>>> DeviceTypeInfo, and introduce a Device specific type registration
>>>>> function, then you could do:
>>>>>
>>>>> static DeviceTypeInfo my_device_type_info = {
>>>>>       .type.name = TYPE_MY_DEVICE,
>>>>>       .type.parent = TYPE_PARENT_DEVICE,
>>>>>       .reset = my_device_reset,
>>>>
>>>> And if you introduce some
>>>>
>>>> #define TYPE_UNIMPLEMENTED (void *)&dummy_variable
>>>
>>> (void *) isn't compatible with integers or function pointers (at least
>>> not in a portable way).
> 
> I don't see how they can be compatible since on some platforms
> sizeof(void (*)(void)) != sizeof(void *).

Do you have an example of a platform relevant to QEMU?
Microcontrollers and DOS come to my mind.

Andreas

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