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This PR adds the `kernel` directory which contains a port of the Extism memory allocator compiled to WebAssembly and removes `runtime/src/memory.rs` completely. Being able to re-use memory functions as a WASM module allows us to begin to experiment with porting Extism to new runtimes! This is in a draft state while I'm verifying some of these changes.
21 lines
772 B
Markdown
21 lines
772 B
Markdown
# Extism kernel
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The Extism kernel implements core parts of the Extism runtime in Rust compiled to WebAssembly. This code is a conceptual
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re-write of [memory.rs][] with the goal of making core parts of the Extism implementation more portable across WebAssembly
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runtimes.
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See [lib.rs][] for more details about the implementation itself.
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## Building
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Because this crate is built using the `wasm32-unknown-unknown` target, it is a separate build process from the `extism-runtime` crate.
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To build `extism-runtime.wasm`, strip it and copy it to the proper location in the `extism-runtime` tree you can run:
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```shell
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$ sh build.sh
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```
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[memory.rs]: https://github.com/extism/extism/blob/f4aa139eced4a74eb4a103f78222ba503e146109/runtime/src/memory.rs
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[lib.rs]: ./src/lib.rs
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