wasm

This package provides utilities for loading and running WASM modules. It is built on top of the Wasmer runtime.

Setup

Run dart bin/setup.dart to build the Wasmer runtime.

Basic Usage

As a simple example, we'll try to call the following C function from Dart using package:wasm. For a more detailed example that uses WASI, check out the example directory.

extern "C" int square(int n) { return n * n; }

We can compile this C++ code to WASM using a recent version of clang:

clang --target=wasm32 -nostdlib -Wl,--export-all -Wl,--no-entry -o square.wasm square.cc

Then we can load and run it like this:

import "dart:io";
import "package:wasm/wasm.dart";

void main() {
  final data = File("square.wasm").readAsBytesSync();
  final mod = WasmModule(data);
  print(mod.describe());
  final inst = mod.instantiate().build();
  final square = inst.lookupFunction("square");
  print(square(12));
}

This should print:

export memory: memory
export function: int32 square(int32)

144