null allowing @safe code to do unsafe stuff.

[deadalnix]

Le 18/03/2012 17:18, Michel Fortin a écrit :
> On 2012-03-18 15:53:42 +0000, deadalnix <deadalnix at gmail.com> said:
>
>> Le 18/03/2012 16:30, Andrei Alexandrescu a écrit :
>>> On 3/18/12 10:19 AM, Timon Gehr wrote:
>>>> No null checks are necessary as long as there is no class that would
>>>> create such a very large object.
>>>
>>> Yah, we need to insert a rule that prevents creating class objects
>>> larger than 64KB. Java has the same.
>>>
>>> Andrei
>>
>> This is another solution. In this case, we have to ensure that the
>> first 64kb of the system are page protected to detect null pointer
>> deference in druntime.
>
> On Mac OS X, the protected area is much smaller. 4 Kb I think on Snow
> Leopard 32-bit.
>

We can page protect the first 64Kb in druntime.