wasm-load-module-example

Naive side by side performance comparison of unmemoized Fibonacci number calculations. Serves to demonstrate how to compile C function to WebAssembly and call it from JS without emscripten runtime.

How to build & run

1. yarn install
2. docker build -t wasm-load-module-example .
3. docker cp $(docker run -d wasm-load-module-example):/usr/src/fib.wasm ./src/
4. yarn start

To find names of exported wasm functions

Get inside docker container:

docker run -it wasm-load-module-example bash

Once inside check WAST:

root@66cd9754dbf5:/usr/src# wasm-dis fib.wasm
(module
 (type $0 (func (param i32) (result i32)))
 (type $1 (func (result i32)))
 (global $global$0 (mut i32) (i32.const 2752))
 (export "_fibC" (func $0))
 (export "_main" (func $1))
 (export "stackAlloc" (func $2))
...

Helpful reading

Compiling a New C/C++ Module to WebAssembly

Using the WebAssembly JavaScript API

WebAssembly Standalone