Hands on WebAssembly

Prepare

Have emsdk installed and ready

https://github.com/emscripten-core/emsdk.git

How to transpile

This is one way to transpile.

This generates a module of function(s) defined in C source file. C source file can consist only of functions but main function. In the case of no main defined in C source file, --no-entry option is needed.

Modulizing target functions are described in the EXPORTED_FUNCTIONS list.

emcc -O1 --no-entry -s "EXPORTED_FUNCTIONS=['_add']" -o add.wasm add.c

How to run

Run up a server

It can be any server, but python server is easy to start up.

python -m http.server 8080

then, open XXX.html

sample files

add.c

takes two integers and return the sum