gc-2.js - mozsearch

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// Example from the proposal.

gczeal(2,5);

var compute_delta = (i) => Promise.resolve(i / 100 || 1);

var suspending_compute_delta = new WebAssembly.Suspending(compute_delta);

var ins = wasmEvalText(`(module

    (import "js" "init_state" (func $init_state (result f64)))

    (import "js" "compute_delta"

      (func $compute_delta (param i32) (result f64)))

    (global $state (mut f64) (f64.const nan))

    (func $init (global.set $state (call $init_state)))

    (start $init)

    (func $get_state (export "get_state") (result f64) (global.get $state))

    (func $update_state (export "update_state") (param i32) (result f64)

      (global.set $state (f64.add

        (global.get $state) (call $compute_delta (local.get 0))))

      (global.get $state)

)`, {

    js: {

        init_state() { return 0; },

        compute_delta: suspending_compute_delta,

},

});

var update_state = WebAssembly.promising(ins.exports.update_state);

var res = update_state(4);

var tasks = res.then((r) => {

    print(r);

    assertEq(ins.exports.get_state(), .04);

});

assertEq(ins.exports.get_state(), 0);