Add wasm reference/pointers translation.

[yurydelendik]

cranelift-wasm is missing conversion of wasm reftypes to cranelift IR. The PR adds capability to translate ref params and locals to IR.

Example: https://gist.github.com/yurydelendik/47b51002f998bccbcad86ace5b62d3d4

/cc @fitzgen

[fitzgen]

👍

[bnjbvr]

Thanks for working on this. Just to make sure to understand how this moves the needle: this only translates from wasm to clif (obviously), but since enable_safepoints is still a thing, embedders need to explicitly enable it, which means implementing more on their side. Is that right? (I am just checking that this won't break e.g. all of Spidermonkey testing.0)

[yurydelendik]

since enable_safepoints is still a thing, embedders need to explicitly enable it, which means implementing more on their side

Correct, this patch mostly prepares cranelift API surface to add wasmtime anyref tests and, for me, to continue wasmtime-api work. You need to specify --set enable_safepoints=true in the clif-util.

[bnjbvr]

Hey @yurydelendik, no pressure here, just wanted to check in what the status of this PR is, and if there's a way we can help?`

[yurydelendik]

just wanted to check in what the status of this PR is, and if there's a way we can help?

I'm seeking the initial feedback, and if I'm close to the "target" I'll rebase that in timely manner. Either way #1176 is the related issue and might influence this PR.

[sunfishcode]

Sorry for the slow review here, but this looks good to me, modulo a rebase at this point.