xtuc/wasm-dce

Eliminate unused functions in your WASM binary

This repo has been moved

See https://github.com/xtuc/js-webassembly-interpreter/tree/master/packages/dce.

wasm-dce

Eliminate unused functions in your WASM binary.

Features

• Removes the export instruction
• Replaces the func with an empty one (to preserve the index)

Example

(module
-   (func $func_1 (param i32) (param i32) (result i32)
-     (get_local 0)
-     (get_local 1)
-     (i32.add)
-   )
-   (export "add" (func $func_1))
+   (func)
)

FAQ

Why not use binaryen?

First you can see the JavaScript API is specified here https://github.com/WebAssembly/binaryen/wiki/binaryen.js-API.

I encounter some issues (like removing the func wasn't working) and added an additional parse of the WASM file.

Third party licenses

• js-webassembly-interpreter - GNU General Public License v2.0 see LICENCE

TODO

• Support DCE for exported global, memory, table.
• Remove elements only used by this function (other imports, data, etc).
• Add CLI for node projects or libs