new streams · general · Zulip Chat Archive

I've tracked down a few things that are preventing this from happening. packed_struct requires std by default There are a few uses of std in cranelift-codegen and cranelift-codegen-shared that ...

bjorn3 (Feb 22 2020 at 16:22):

For an old example of how to use it with no_std, see https://github.com/nebulet/nebulet (a kernel running wasm)

nebulet/nebulet

(Going to be) A microkernel that implements a WebAssembly "usermode" that runs in Ring 0. - nebulet/nebulet

NotWearingPants (Feb 22 2020 at 16:23):

yeah im trying to build a new nebulet of some sorts, but its code looks too complicated for no reason

NotWearingPants (Feb 22 2020 at 16:24):

you think that forking nebulet would be better instead of trying to reimplement it with new versions?

bjorn3 (Feb 22 2020 at 16:25):

Forking nebulet will likely save a lot of effort re-implementing stuff that is fairly generic for kernels, like setting up page tables and handling interrupts.

NotWearingPants (Feb 22 2020 at 16:26):

hmm, i don't think nebulet needs page tables because of wasm's memory

NotWearingPants (Feb 22 2020 at 16:27):

but i'm fine with the kernel stuff, i'm just missing the new WebAssembly.Module bit, and it's weird that it requires more than 1 dependency

bjorn3 (Feb 22 2020 at 16:28):

I believe x86_64 always requires page tables. Also the most efficient way to implement a wasm heap is to allocate a region of 4GB and then only map the wasm accessable pages into it.

NotWearingPants (Feb 22 2020 at 16:29):

not sure about 64bit requiring it, but i don't need paging to do this, i can just divvy up the heap into 4GB chunks and give them to the wasm implementation

bjorn3 (Feb 22 2020 at 16:30):

i can just divvy up the heap into 4GB chunks and give them to the wasm implementation

That will only work if you have 4GB * amount of wasm module instances of free memory and is wasteful in any case.

NotWearingPants (Feb 22 2020 at 16:32):

enabling paging just gives me another translation implemented in hardware, whereas wasm can handle translation in software, so i dont see how thats wasteful

NotWearingPants (Feb 22 2020 at 16:32):

so cranelif_wasm + cranelift_codegen is the best way to run wasm? where do i put the imports?

bjorn3 (Feb 22 2020 at 16:33):

NotWearingPants said:

enabling paging just gives me another translation implemented in hardware, whereas wasm can handle translation in software, so i dont see how thats wasteful

While you could handle this translation in software, it is much faster to handle it in hardware.

bjorn3 (Feb 22 2020 at 16:34):

NotWearingPants said:

so cranelif_wasm + cranelift_codegen is the best way to run wasm?

Probably

NotWearingPants said:

where do i put the imports?

What do you mean?

NotWearingPants (Feb 22 2020 at 16:34):

where do i pass the imports that my module requires in the cranelift_wasm+cranelift_codegen code?

bjorn3 (Feb 22 2020 at 16:36):

Context::compile_and_emit accepts a RelocSink. This will get all places where you need to write the address of an import. See for example https://docs.rs/cranelift-simplejit/0.58.0/src/cranelift_simplejit/backend.rs.html#394-442

NotWearingPants (Feb 22 2020 at 16:41):

doesn't look like i can easily pass imports here, but thanks!
ill try to write something up and come back here if i have trouble

Notification Bot (Mar 04 2020 at 09:48):

Till Schneidereit created a new stream #git-wasmtime.

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Possibly a spambot? Also sent a PM to me with just "hi"

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babe hold on

Till Schneidereit (Apr 01 2020 at 10:10):

Yeah, very much looks like a spam bot—I disabled the account

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I also changed the settings to make it so people have to wait 3 days after joining before they can create new streams

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fitzgen (he/him) (Nov 30 2020 at 18:33):

Can we add a git stream for the bytecodealliance/RFCs repo? I can't figure out how to create git streams

cc @Till Schneidereit

Till Schneidereit (Nov 30 2020 at 22:37):

One needs to add a webhook to the repo, and then a bot integration for that webhook for Zulip — both need admin access, so I'll set things up for an rfc-notifications stream. The most difficult question to answer is on which kinds of events to notify :smile: