[cfe-dev] Making clang work with opaque pointers

[John McCall via cfe-dev]

On 9 Jul 2021, at 7:49, Aaron Ballman wrote:
> On Fri, Jul 9, 2021 at 2:27 AM David Blaikie <dblaikie at gmail.com> 
> wrote:
>>
>> Aaron - any ideas on who, if anyone, might be able to help out on 
>> this?
>
> I've CCed in some folks who may be able to help (but I am not certain
> whether they've got the bandwidth or not).
>
> ~Aaron
>
>>
>> On Thu, Jul 8, 2021 at 4:46 PM Arthur Eubanks via cfe-dev 
>> <cfe-dev at lists.llvm.org> wrote:
>>>
>>> As part of the opaque pointers migration, we need to make the clang 
>>> frontend not depend on PointerType's pointee type. There are a 
>>> couple random places that need to be fixed up to not use 
>>> PointerType::getElementType and Type::getPointerElementType(), but 
>>> the biggest issue is (I believe) clang::CodeGen::Address (and 
>>> LValue/RValue?).

My expectation is that `clang::CodeGen::Address` will just start 
carrying an element type.  So the preparation for removing element types 
should be that we pass an element type to the places that construct an 
`Address` from scratch and (for now) assert that it matches the pointer 
element type.

John.

>>>
>>> I had a very preliminary attempt in https://reviews.llvm.org/D103465 
>>> but am not super familiar with the clang frontend. Is there anybody 
>>> more familiar with clang who'd be willing to make clang work with 
>>> opaque pointers?


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