Proposal: Move primitive-Data.Primitive.Addr API into base

[Carter Schonwald]

... when is a valid pointer not going to point at byte addressable memory
on memory architectures ghc can support or target?

On Thu, Oct 25, 2018 at 8:27 PM Daniel Cartwright <chessai1996 at gmail.com>
wrote:

> Now, one could argue that `Ptr ()` isn't a lie, it sort of reads like C's
> void pointer. But surely something like `Ptr Word8` is a lie, when it is
> not actually a Ptr to Word8 values.
>
> On Thu, Oct 25, 2018 at 8:11 PM Daniel Cartwright <chessai1996 at gmail.com>
> wrote:
>
>> yes, only the type and its instances should be moved as far as i'm aware.
>>
>> Also, it's more than just base.
>>
>> this Ptr is a lie:
>> https://hackage.haskell.org/package/ghc-compact-0.1.0.0/docs/GHC-Compact-Serialized.html#t:SerializedCompact
>> these Ptrs are lies:
>> https://hackage.haskell.org/package/base-4.12.0.0/docs/GHC-IO-Handle.html
>> in GHC.Stats, the foreign import "getRTSStats" has `Ptr () -> IO ()`,
>> this Ptr () is also a lie
>>
>> These are just off the top of my head, there are more
>>
>>
>> On Thu, Oct 25, 2018 at 6:46 PM Carter Schonwald <
>> carter.schonwald at gmail.com> wrote:
>>
>>> hrmm, what are the pieces of base that are using Ptr when they really
>>> should be using Addr? This would help me understand what would be made
>>> better in base :)
>>>
>>> On Thu, Oct 25, 2018 at 6:19 PM David Feuer <david.feuer at gmail.com>
>>> wrote:
>>>
>>>> We shouldn't really need to move anything into base except Addr and its
>>>> base instances.
>>>>
>>>> On Oct 25, 2018 5:59 PM, "Carter Schonwald" <carter.schonwald at gmail.com>
>>>> wrote:
>>>>
>>>> Indeed.  The monad transformer instances for primmonad need to live in
>>>> primmonad OR transformers to avoid orphans.
>>>>
>>>> Either way, unless transformers moves into base (unlikely), no way
>>>> anything using prim monad will.
>>>>
>>>> On Thu, Oct 25, 2018 at 3:34 PM Andrew Martin <
>>>> andrew.thaddeus at gmail.com> wrote:
>>>>
>>>>> I like the idea of moving the type Addr into base. But we cannot move
>>>>> the entire module since it has functions that talk about PrimMonad, and we
>>>>> definitely don't want to move that into base.
>>>>>
>>>>> On Thu, Oct 25, 2018 at 11:25 AM Daniel Cartwright <
>>>>> chessai1996 at gmail.com> wrote:
>>>>>
>>>>>> Motivation: There are a lot of places in base where 'Ptr a' is used
>>>>>> in place of 'Addr', because in base there is no 'Addr', only 'Addr#'. The
>>>>>> problem lies in the fact that many of these uses of 'Ptr a' are lying; the
>>>>>> 'a' value is meaningless. Authors of functions therein have used things
>>>>>> like 'Ptr ()', 'Ptr Word8', 'Ptr a', but these types do not mean what they
>>>>>> say they mean - they're just Addr. There are probably other motivations for
>>>>>> this that I can't think of off the top of my head right now.
>>>>>> _______________________________________________
>>>>>> Libraries mailing list
>>>>>> Libraries at haskell.org
>>>>>> http://mail.haskell.org/cgi-bin/mailman/listinfo/libraries
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> -Andrew Thaddeus Martin
>>>>> _______________________________________________
>>>>> Libraries mailing list
>>>>> Libraries at haskell.org
>>>>> http://mail.haskell.org/cgi-bin/mailman/listinfo/libraries
>>>>>
>>>> _______________________________________________
>>>> Libraries mailing list
>>>> Libraries at haskell.org
>>>> http://mail.haskell.org/cgi-bin/mailman/listinfo/libraries
>>>>
>>>>
>>>> _______________________________________________
>>> Libraries mailing list
>>> Libraries at haskell.org
>>> http://mail.haskell.org/cgi-bin/mailman/listinfo/libraries
>>>
>>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.haskell.org/pipermail/libraries/attachments/20181025/8e79aa60/attachment-0001.html>