How can I use WebAssembly Reference Types with LDC?

[Richard (Rikki) Andrew Cattermole]

On 15/09/2024 5:05 AM, TM wrote:
> On Saturday, 14 September 2024 at 12:08:13 UTC, kinke wrote:
>> On Saturday, 14 September 2024 at 08:28:02 UTC, TM wrote:
>>> In C/C++, you can access wasm's externref and funcref using:
>>> ```C++
>>> char __attribute__((address_space(10)))* //externref
>>> char __attribute__((address_space(20)))* //funcref
>>> ```
>>> Does D provide similar functionality?
>>
>> Nope, there's currently no way to customize the address-space of 
>> pointers. dcompute has 2-3 magic structs for expressing such pointers.
>>
>> Maybe this could by solved via some magic
>> ```D
>> // magic struct requiring compiler support
>> struct __as_pointer(T, uint addressSpace) { T* ptr; alias this = ptr; }
>>
>> alias ExternRef(T) = __as_pointer!(T, 10);
>> alias FuncRef(T) = __as_pointer!(T, 20);
>> ```
> 
> Thank you for your response. Unfortunately, I was unable to generate 
> wasm's externref using the method you suggested. It appears that 
> dcompute cannot generate code targeting wasm.
> 
> Sadly, it seems difficult to achieve this with the capabilities of the 
> dlang.

Indeed, what Martin is suggesting is that a compiler improvement is 
required.

There is no way to do what you want currently.