Rust bindings for the Wasm spec interpreter.

Bytecode Alliance

Last update: Aug 23, 2022

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Overview

wasm-spec-interpreter

This project shows how to use ocaml-interop to call into the Wasm spec interpreter. There are several steps to making this work:

building the OCaml Wasm spec interpreter as a static library
building a Rust-to-OCaml FFI bridge using ocaml-interop and a custom OCaml wrapper
linking both things into a Rust crate

Dependencies

This crate only builds in an environment with:

make (the Wasm spec interpreter uses a Makefile)
ocamlopt, ocamlbuild (available with, e.g., dnf install ocaml)
Linux tools (e.g. ar); currently it is easiest to build the static libraries in a single environment but this could be fixed in the future (TODO)
libgmp, for the OCaml zarith package
git is used by build.rs to retrieve the repository containing the Wasm spec interpreter; it is safe to completely remove ocaml/spec to get a new copy

Build

cargo build --features build-libinterpret

Use FFI_LIB_DIR=path/to/lib/... to specify a different location for the static library (this is mainly for debugging). If the build-libinterpret feature is not provided, this crate will build successfully but fail at runtime.

Test

cargo test --features build-libinterpret

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Comments

Add `LICENSE` file

This crate was previously licensed under the Apache v2 license covering the Wasmtime crates. This change brings the LICENSE file over to the new repository.

opened by abrown 0