[WIP] Upgrading the bindgen for host and guest (WASM) #26

era commented 2023年02月08日 23:17:13 +01:00

It's been a while since this project was sync'ed with wit-bindgen project. There was a couple of changes, but the most important are:

1. wit-bindgen-host-wasmtime-rust was moved to wasmtime
2. We have a new syntax for wit files

This lead to some problems:

1. When starting the server, the compiled wasm example plugin does not work error: failed to parse WebAssembly module caused by: attempted to parse a wasm module with a component parser

Solution:

cargo build --target wasm32-wasi
wasm-tools component new ./target/wasm32-wasi/debug/my-project.wasm \
 -o my-component.wasm --adapt ./wasi_snapshot_preview1.wasm

2. Wasi context

The linker changed to use wasmtime::component::Linker which is not compatible with wasmtime::Linker needed to link the default WasiCtx. Currently there is some work to handle this in a preview repo from Wasmtime, but that repo is very much unstable: https://bytecodealliance.zulipchat.com/#narrow/stream/217126-wasmtime/topic/WasiCtx.20and.20component.3A.3ALinker

It's been a while since this project was sync'ed with wit-bindgen project. There was a couple of changes, but the most important are: 1. wit-bindgen-host-wasmtime-rust was moved to wasmtime 2. We have a new syntax for wit files This lead to some problems: 1. When starting the server, the compiled wasm example plugin does not work error: `failed to parse WebAssembly module caused by: attempted to parse a wasm module with a component parser` Solution: ``` cargo build --target wasm32-wasi wasm-tools component new ./target/wasm32-wasi/debug/my-project.wasm \ -o my-component.wasm --adapt ./wasi_snapshot_preview1.wasm ``` 2. Wasi context The linker changed to use `wasmtime::component::Linker` which is not compatible with `wasmtime::Linker` needed to link the default WasiCtx. Currently there is some work to handle this in a preview repo from Wasmtime, but that repo is very much unstable: https://bytecodealliance.zulipchat.com/#narrow/stream/217126-wasmtime/topic/WasiCtx.20and.20component.3A.3ALinker

era commented 2023年02月08日 23:30:06 +01:00

we also need the preview1 file from: https://github.com/bytecodealliance/preview2-prototyping/releases/tag/latest

we also need the preview1 file from: https://github.com/bytecodealliance/preview2-prototyping/releases/tag/latest

era commented 2023年02月09日 19:11:53 +01:00

New issue and blocking issue:

error while instantiating plugin import `wasi-stderr` not defined

The issue is that the wasmtime generated add_to_linker takes a Component::Linker and not a normal Linker.

related issue: https://github.com/bytecodealliance/wasmtime/issues/4303

While this is not formalized better, there is no point in keep trying to update it.

Relevant: https://bytecodealliance.zulipchat.com/#narrow/stream/217126-wasmtime/topic/WasiCtx.20and.20component.3A.3ALinker

New issue and blocking issue: ``` error while instantiating plugin import `wasi-stderr` not defined ``` The issue is that the wasmtime generated `add_to_linker` takes a Component::Linker and not a normal Linker. related issue: https://github.com/bytecodealliance/wasmtime/issues/4303 While this is not formalized better, there is no point in keep trying to update it. Relevant: https://bytecodealliance.zulipchat.com/#narrow/stream/217126-wasmtime/topic/WasiCtx.20and.20component.3A.3ALinker