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// Example from the proposal.
var compute_delta = async (i) => Promise.resolve(i / 100 || 1);
var suspending_compute_delta = new WebAssembly.Function(
{ parameters: ['externref', 'i32'], results: ['f64'] },
compute_delta,
{ suspending: "first" }
);
var ins = wasmEvalText(`(module
(import "js" "init_state" (func $init_state (result f64)))
(import "js" "compute_delta"
(func $compute_delta_import (param externref) (param i32) (result f64)))
(global $suspender (mut externref) (ref.null extern))
(global $state (mut f64) (f64.const nan))
(func $init (global.set $state (call $init_state)))
(start $init)
(func $compute_delta (param i32) (result f64)
(local $suspender_copy externref)
(;return (f64.const 0.3);)
(;unreachable;)
(global.get $suspender)
(local.tee $suspender_copy)
(local.get 0)
(call $compute_delta_import)
(local.get $suspender_copy)
(global.set $suspender)
(return)
)
(func $get_state (export "get_state") (result f64) (global.get $state))
(func $update_state (param i32) (result f64)
(global.set $state (f64.add
(global.get $state) (call $compute_delta (local.get 0))))
(global.get $state)
)
(func (export "update_state_export")
(param $suspender externref) (param i32) (result f64)
(local.get $suspender)
(global.set $suspender)
(local.get 1)
(call $update_state)
(return)
)
)`, {
js: {
init_state() { return 0; },
compute_delta: suspending_compute_delta,
},
});
var update_state = new WebAssembly.Function(
{ parameters: ['i32'], results: ['externref'] },
ins.exports.update_state_export,
{ promising: "first" }
);
var res = update_state(4);
var tasks = res.then((r) => {
print(r);
assertEq(ins.exports.get_state(), .04);
});
assertEq(ins.exports.get_state(), 0);
// Also test with exceptions/traps.
async function test(c) {
var compute_delta = (i) => Promise.resolve(i/100 || 1);
if (c == 1) compute_delta = async (i) => {throw "ff"};
if (c == 2) compute_delta = () => {throw "ff";}
var suspending_compute_delta = new WebAssembly.Function(
{parameters:['externref', 'i32'], results:['f64']},
compute_delta,
{suspending:"first"}
);
var ins = wasmEvalText(`(module
(import "js" "init_state" (func $init_state (result f64)))
(import "js" "compute_delta"
(func $compute_delta_import (param externref) (param i32) (result f64)))
(global $suspender (mut externref) (ref.null extern))
(global $state (mut f64) (f64.const nan))
(func $init (global.set $state (call $init_state)))
(start $init)
(func $compute_delta (param i32) (result f64)
(local $suspender_copy externref)
(;return (f64.const 0.3);)
${c == 3 ? "(unreachable)" : ""}
(global.get $suspender)
(local.tee $suspender_copy)
(local.get 0)
(call $compute_delta_import)
${c == 4 ? "(unreachable)" : ""}
(local.get $suspender_copy)
(global.set $suspender)
(return)
)
(func $get_state (export "get_state") (result f64) (global.get $state))
(func $update_state (param i32) (result f64)
(global.set $state (f64.add
(global.get $state) (call $compute_delta (local.get 0))))
(global.get $state)
)
(func (export "update_state_export")
(param $suspender externref) (param i32) (result f64)
(local.get $suspender)
(global.set $suspender)
(local.get 1)
(call $update_state)
(return)
)
)`, {
js: {
init_state() { return 0; },
compute_delta: suspending_compute_delta,
},
});
var update_state = new WebAssembly.Function(
{parameters:['i32'], results:['externref']},
ins.exports.update_state_export,
{promising : "first"}
);
var res = update_state(4);
var p = res.then((r) => {
assertEq(c, 0);
assertEq(ins.exports.get_state(), .04);
}).catch(_ => {
assertEq(c > 0, true);
});
assertEq(ins.exports.get_state(), 0);
await p;
}
for (let c = 0; c < 5; c++) {
tasks = tasks.then(() => test(c));
}
|
