@pinned classes

[div0]

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Justin Spahr-Summers wrote:
> On Wed, 31 Mar 2010 22:59:08 -0400, bearophile 
>>
>> Bye,
>> bearophile
> 
> I think the D2 spec puts restrictions on what you can do with GC-
> allocated pointers (can't convert them to integers, can't perform 
> arithmetic on them outside of their bounds, etc.), and I think they're 
> restrictive enough that a copying garbage collector could work with no 
> changes to compliant code.
> 
> - Justin Spahr-Summers

The trouble with a moving garbage collector is that you have to be able
to accurately scan the stacks of all threads. This is difficult to do
with a language that can arbitrarily call into functions provided by
different languages for which the compiler won't and can't have stack
layout info.

It's especially a pain on windows, as D code is called from window
procedures, so most code is already using a stack which can't be scanned.

Might be more doable on linux, xlib has a vastly better design than win32.

- --
My enormous talent is exceeded only by my outrageous laziness.
http://www.ssTk.co.uk
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