wasmdec

wasmdec is a program that converts WebAssembly binaries to pseudo-C code.

Example

wasmdec will translate this WebAssembly binary:

(module
	(func $addTwo (param i32 i32) (result i32)
		(return
			(i32.add (get_local 0) (get_local 1))
		)
	)
	(export "addTwo" $addTwo)
)

To the following pseudo-C code:

int fn_addTwo(int arg0, int arg1) {
	return arg0 + arg1;
}

Installing with release

• Grab a release on the releases page and select the correct tarball for your OS and arch.
• Extract and run install.sh as root.

Installing manually

Getting the code

Clone the repository with

git clone https://github.com/wwwg/wasmdec.git --recursive

Make sure the recursive flag is set to clone all the submodules.

Building

To build wasmdec and install all of it's dependencies, run sudo make all in the wasmdec directory. GCC 7 or higher is reccomended.

Usage

wasmdec -o (output file) (options) input file

Where options is one of:

• -e or --extra : Writes extra information about the binary to output files (Obsolete when using memdump)
• -m or --memdump : Dumps the binary's memory to disk. Please note that if memdump ONLY dumps memory and doesn't perform any translation.
• -d or --debug : Print extra debug information to stdout

WebAssembly Feature Support

wasmdec supports almost every single WASM expression, with the exception of atomics. No support for atomics are planned.