My intend is to execute the following functions:

    int counter = 100;

    int count() {
        return counter += 1;
    }

    int add(int a, int b){
        return a + b;
    }

I followed this tutorial
and create a docker container for the webassembly toolchain which allows me to build a *.wasm from *.c with the following command:
docker run --rm --name generate-wasm-default -v ${PWD}:/src -i -t chrisber/llvm-webassembly:latest /bin/build.sh hello_world.c
Basically it does the following:

clang -emit-llvm --target=wasm32 -S hello_world.c
llc hello_world.ll -march=wasm32
s2wasm hello_world.s > hello_world.wast
wast2wasm -o hello_world.wasm hello_world.wast

Then calling within index.js:

const dependencies = {
    "global": {},
    "env": {}
};
const instance = new WebAssembly.Instance(module, dependencies);
const wasm = instance.exports;

Calling the function count:
console.log("count function result is : " + wasm.count()); works just fine, but calling:
console.log("add function result is : " + wasm.add(1,1)); leads to the following error:

Uncaught (in promise) RuntimeError: memory access out of bounds
    at  (<WASM>[1]+15)
    at http://localhost:3000/main.bundle.js:39:60
(anonymous) @ wasm-9d2fd5a6-1:9
(anonymous) @ index.ts:20

My higher goal would be to call functions linked from a shared library like:.

clang -emit-llvm --target=wasm32 -S hello_world.c -L. -lxyz and calling it with

extern "C" {
    //....
}

but the error Uncaught (in promise) RuntimeError: memory access out of bounds prevents me from
experimenting with extern "c".

The project is located here.

• Docker container link
• index.js
• hello_world.c
• hello_world.wast

I'm stuck with this issue and your help is highly appreciated.