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wasmtime/crates/fuzzing/wasm-spec-interpreter/README.md
Andrew Brown 0c7885cc05 fuzz: improve wasm-spec-interpreter documentation, add library path (#4007) 
The documentation for the `wasm-spec-interpreter` was not up-to-date,
causing some confusion on non-Ubuntu machines. This change adds the
correct dependencies to install and includes the `libgmp` path for
Fedora by default (i.e., `/lib64`).
2022-04-11 09:07:58 -05:00

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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