tuanha1305 / wasm

Utilities for loading and running WASM modules from Dart code

Provides utilities for loading and running WASM modules

Built on top of the Wasmer runtime.

Setup

Run dart run wasm:setup 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.builder().build();
  final square = inst.lookupFunction('square');
  print(square(12));
}

This should print:

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

144