wasm2cl - WASM to Common Lisp transpiler

The finest way to "Heap exhausted, game over."!

Example

# Install the wasm32-wasip1 toolchain
rustup target add wasm32-wasip1
# Build a test file
cargo build --target wasm32-wasip1 --release
# Produce `wasm2cl-wasm2cl-sys/`
# Functions are spread over multiple files to
# reduce the likelyhood of running out of memory
# during compilation.
cargo run --release -- target/wasm32-wasip1/release/wasm2cl.wasm wasm2cl-wasm2cl-sys

;; system `wasm2cl-wasm2cl-sys` will be freshly created in `wasm2cl-wasm2cl-sys/`
;; and system `wasm2cl` is in `runtime/`
(asdf:load-system :wasm2cl-wasm2cl-sys)
(wasm2cl-wasip1:run :wasm2cl-wasm2cl-sys "--help")

TODO

Run the standard conformance tests against this, ideally in CI too.

Ports

There are ports of a few libraries and programs. They require wasi-sdk to build, tested with 33.0.

cd ports
./build.sh <path-to-wasi-sdk>

This produces a few wasm files that can be translated.

• ports/sysroot/games/prboom
• ports/sysroot/bin/sdlquake

Data files for prboom available in ports/prboom-2.5.0/data/ (Doom 1 shareware WAD) Data files for sdlquake available in ports/sdlquake-1.0.9/id1/ (Quake 1 shareware)

SBCL miscompilation on arm64 (updated 2026-8-9)

sdlquake triggers a miscompilation on arm64 related to specialized entry points. This can be worked around by passing the --notinline flag to wasm2cl to disable this SBCL functionality.