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denoland-deno/runtime/js/11_workers.js
Aapo Alasuutari 2164f6b1eb
perf(ops): Monomorphic sync op calls (#15337)
Welcome to better optimised op calls! Currently opSync is called with parameters of every type and count. This most definitely makes the call megamorphic. Additionally, it seems that spread params leads to V8 not being able to optimise the calls quite as well (apparently Fast Calls cannot be used with spread params).

Monomorphising op calls should lead to some improved performance. Now that unwrapping of sync ops results is done on Rust side, this is pretty simple:

```
opSync("op_foo", param1, param2);
// -> turns to
ops.op_foo(param1, param2);
```

This means sync op calls are now just directly calling the native binding function. When V8 Fast API Calls are enabled, this will enable those to be called on the optimised path.

Monomorphising async ops likely requires using callbacks and is left as an exercise to the reader.
2022-08-11 15:56:56 +02:00

252 lines
6.8 KiB
JavaScript

// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
"use strict";
((window) => {
const core = window.Deno.core;
const ops = core.ops;
const {
Error,
ObjectPrototypeIsPrototypeOf,
StringPrototypeStartsWith,
String,
SymbolIterator,
SymbolToStringTag,
} = window.__bootstrap.primordials;
const webidl = window.__bootstrap.webidl;
const { URL } = window.__bootstrap.url;
const { getLocationHref } = window.__bootstrap.location;
const { serializePermissions } = window.__bootstrap.permissions;
const { log } = window.__bootstrap.util;
const { defineEventHandler } = window.__bootstrap.event;
const {
deserializeJsMessageData,
serializeJsMessageData,
MessagePortPrototype,
} = window.__bootstrap.messagePort;
function createWorker(
specifier,
hasSourceCode,
sourceCode,
permissions,
name,
workerType,
) {
return ops.op_create_worker({
hasSourceCode,
name,
permissions: serializePermissions(permissions),
sourceCode,
specifier,
workerType,
});
}
function hostTerminateWorker(id) {
ops.op_host_terminate_worker(id);
}
function hostPostMessage(id, data) {
ops.op_host_post_message(id, data);
}
function hostRecvCtrl(id) {
return core.opAsync("op_host_recv_ctrl", id);
}
function hostRecvMessage(id) {
return core.opAsync("op_host_recv_message", id);
}
class Worker extends EventTarget {
#id = 0;
#name = "";
// "RUNNING" | "CLOSED" | "TERMINATED"
// "TERMINATED" means that any controls or messages received will be
// discarded. "CLOSED" means that we have received a control
// indicating that the worker is no longer running, but there might
// still be messages left to receive.
#status = "RUNNING";
constructor(specifier, options = {}) {
super();
specifier = String(specifier);
const {
deno,
name,
type = "classic",
} = options;
const workerType = webidl.converters["WorkerType"](type);
if (
StringPrototypeStartsWith(specifier, "./") ||
StringPrototypeStartsWith(specifier, "../") ||
StringPrototypeStartsWith(specifier, "/") || workerType === "classic"
) {
const baseUrl = getLocationHref();
if (baseUrl != null) {
specifier = new URL(specifier, baseUrl).href;
}
}
this.#name = name;
let hasSourceCode, sourceCode;
if (workerType === "classic") {
hasSourceCode = true;
sourceCode = `importScripts("#");`;
} else {
hasSourceCode = false;
sourceCode = "";
}
const id = createWorker(
specifier,
hasSourceCode,
sourceCode,
deno?.permissions,
name,
workerType,
);
this.#id = id;
this.#pollControl();
this.#pollMessages();
}
#handleError(e) {
const event = new ErrorEvent("error", {
cancelable: true,
message: e.message,
lineno: e.lineNumber ? e.lineNumber : undefined,
colno: e.columnNumber ? e.columnNumber : undefined,
filename: e.fileName,
error: null,
});
this.dispatchEvent(event);
// Don't bubble error event to window for loader errors (`!e.fileName`).
// TODO(nayeemrmn): It's not correct to use `e.fileName` to detect user
// errors. It won't be there for non-awaited async ops for example.
if (e.fileName && !event.defaultPrevented) {
window.dispatchEvent(event);
}
return event.defaultPrevented;
}
#pollControl = async () => {
while (this.#status === "RUNNING") {
const [type, data] = await hostRecvCtrl(this.#id);
// If terminate was called then we ignore all messages
if (this.#status === "TERMINATED") {
return;
}
switch (type) {
case 1: { // TerminalError
this.#status = "CLOSED";
} /* falls through */
case 2: { // Error
if (!this.#handleError(data)) {
throw new Error("Unhandled error in child worker.");
}
break;
}
case 3: { // Close
log(`Host got "close" message from worker: ${this.#name}`);
this.#status = "CLOSED";
return;
}
default: {
throw new Error(`Unknown worker event: "${type}"`);
}
}
}
};
#pollMessages = async () => {
while (this.#status !== "TERMINATED") {
const data = await hostRecvMessage(this.#id);
if (this.#status === "TERMINATED" || data === null) {
return;
}
let message, transferables;
try {
const v = deserializeJsMessageData(data);
message = v[0];
transferables = v[1];
} catch (err) {
const event = new MessageEvent("messageerror", {
cancelable: false,
data: err,
});
this.dispatchEvent(event);
return;
}
const event = new MessageEvent("message", {
cancelable: false,
data: message,
ports: transferables.filter((t) =>
ObjectPrototypeIsPrototypeOf(MessagePortPrototype, t)
),
});
this.dispatchEvent(event);
}
};
postMessage(message, transferOrOptions = {}) {
const prefix = "Failed to execute 'postMessage' on 'MessagePort'";
webidl.requiredArguments(arguments.length, 1, { prefix });
message = webidl.converters.any(message);
let options;
if (
webidl.type(transferOrOptions) === "Object" &&
transferOrOptions !== undefined &&
transferOrOptions[SymbolIterator] !== undefined
) {
const transfer = webidl.converters["sequence<object>"](
transferOrOptions,
{ prefix, context: "Argument 2" },
);
options = { transfer };
} else {
options = webidl.converters.StructuredSerializeOptions(
transferOrOptions,
{
prefix,
context: "Argument 2",
},
);
}
const { transfer } = options;
const data = serializeJsMessageData(message, transfer);
if (this.#status === "RUNNING") {
hostPostMessage(this.#id, data);
}
}
terminate() {
if (this.#status !== "TERMINATED") {
this.#status = "TERMINATED";
hostTerminateWorker(this.#id);
}
}
[SymbolToStringTag] = "Worker";
}
defineEventHandler(Worker.prototype, "error");
defineEventHandler(Worker.prototype, "message");
defineEventHandler(Worker.prototype, "messageerror");
webidl.converters["WorkerType"] = webidl.createEnumConverter("WorkerType", [
"classic",
"module",
]);
window.__bootstrap.worker = {
Worker,
};
})(this);