wat-instantiate
v2.0.1
Published
Convert a WAT string to a WASM module.
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#wat-instantiate wat-instantiate is a simple helper function built on top of WebAssembly Binary Toolkit (wabt) that allows you to compile WAT code from within a node module.
Usage
npm install wat-instantiate --save
There is a single function exported by wat-instantiate. This function takes as parameters a string contining your WAT code, an import and export object, and a list of the names of the exported functions.
const wat_instantiate = require("wat-instantiate");
const exportObject = {};
const importObject = {
js: {
global_a: 99,
global_b: 100
}
};
const wat = `
(module
(global (import "js" "global_a") i32)
(global (import "js" "global_b") i32)
(func (export "AddGlobals") (result i32)
get_global 0
get_global 1
i32.add
)
(func (export "IntAdd") (param $var1 i32) (param $var2 i32) (result i32)
get_local $var1
get_local $var2
i32.add
)
(func (export "IntSub") (param $var1 i32) (param $var2 i32) (result i32)
get_local $var1
get_local $var2
i32.sub
)
(func (export "IntMul") (param $var1 i32) (param $var2 i32) (result i32)
get_local $var1
get_local $var2
i32.mul
)
)
`;
const callback = function() {
let add_num = exportObject.IntAdd( 100, 10 );
let sub_num = exportObject.IntSub( 100, 10 );
let mul_num = exportObject.IntMul( 100, 10 );
let global_result = exportObject.AddGlobals();
console.log(`add_num: ${add_num}`);
console.log(`sub_num: ${sub_num}`);
console.log(`mul_num: ${mul_num}`);
console.log(`global_result: ${global_result}`);
}
wat_instantiate(wat, callback, importObject, exportObject);