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perf(ext/fetch): use new instead of createBranded (#20624)

This PR optimizes `fromInner*` methods of `Request` / `Header` /
`Response` used by `Deno.serve` and `fetch` by using `new` instead of
`ObjectCreate` from `createBranded`.

The "brand" is created by passing `webidl.brand` to the constructor
instead.


142449ecab/ext/webidl/00_webidl.js (L1001-L1005)

### Benchmark
```js
const createBranded = Symbol("create branded");
const brand = Symbol("brand");
class B {
  constructor(init) {
    if (init === createBranded) {
      this[brand] = brand;
    }
  }
}

Deno.bench("Object.create(protoype)", () => {
  Object.create(B.prototype);
});

Deno.bench("new Class", () => {
  new B(createBranded);
});
```

```
cpu: 13th Gen Intel(R) Core(TM) i9-13900H
runtime: deno 1.37.0 (x86_64-unknown-linux-gnu)

benchmark                    time (avg)        iter/s             (min … max)       p75       p99      p995
----------------------------------------------------------------------------- -----------------------------
Object.create(protoype)       8.74 ns/iter 114,363,610.3    (7.32 ns … 26.02 ns)   8.65 ns  13.39 ns  14.47 ns
new Class                     3.05 ns/iter 328,271,012.2      (2.78 ns … 9.1 ns)   3.06 ns   3.46 ns    3.5 ns
```
This commit is contained in:
Marcos Casagrande 2023-09-22 04:06:42 +02:00 committed by GitHub
parent 142449ecab
commit 65a94a6176
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
3 changed files with 24 additions and 6 deletions

View file

@ -40,6 +40,7 @@ const _headerList = Symbol("header list");
const _iterableHeaders = Symbol("iterable headers");
const _iterableHeadersCache = Symbol("iterable headers cache");
const _guard = Symbol("guard");
const _brand = webidl.brand;
/**
* @typedef Header
@ -286,12 +287,17 @@ class Headers {
/** @param {HeadersInit} [init] */
constructor(init = undefined) {
if (init === _brand) {
this[_brand] = _brand;
return;
}
const prefix = "Failed to construct 'Headers'";
if (init !== undefined) {
init = webidl.converters["HeadersInit"](init, prefix, "Argument 1");
}
this[webidl.brand] = webidl.brand;
this[_brand] = _brand;
this[_guard] = "none";
if (init !== undefined) {
fillHeaders(this, init);
@ -486,7 +492,7 @@ webidl.converters["Headers"] = webidl.createInterfaceConverter(
* @returns {Headers}
*/
function headersFromHeaderList(list, guard) {
const headers = webidl.createBranded(Headers);
const headers = new Headers(_brand);
headers[_headerList] = list;
headers[_guard] = guard;
return headers;

View file

@ -52,6 +52,7 @@ const _mimeType = Symbol("mime type");
const _body = Symbol("body");
const _url = Symbol("url");
const _method = Symbol("method");
const _brand = webidl.brand;
/**
* @param {(() => string)[]} urlList
@ -275,6 +276,11 @@ class Request {
* @param {RequestInit} init
*/
constructor(input, init = {}) {
if (input === _brand) {
this[_brand] = _brand;
return;
}
const prefix = "Failed to construct 'Request'";
webidl.requiredArguments(arguments.length, 1, prefix);
input = webidl.converters["RequestInfo_DOMString"](
@ -284,7 +290,7 @@ class Request {
);
init = webidl.converters["RequestInit"](init, prefix, "Argument 2");
this[webidl.brand] = webidl.brand;
this[_brand] = _brand;
/** @type {InnerRequest} */
let request;
@ -554,7 +560,7 @@ function toInnerRequest(request) {
* @returns {Request}
*/
function fromInnerRequest(inner, signal, guard) {
const request = webidl.createBranded(Request);
const request = new Request(_brand);
request[_request] = inner;
request[_signal] = signal;
request[_getHeaders] = () => headersFromHeaderList(inner.headerList, guard);

View file

@ -60,6 +60,7 @@ const _response = Symbol("response");
const _headers = Symbol("headers");
const _mimeType = Symbol("mime type");
const _body = Symbol("body");
const _brand = webidl.brand;
/**
* @typedef InnerResponse
@ -305,6 +306,11 @@ class Response {
* @param {ResponseInit} init
*/
constructor(body = null, init = undefined) {
if (body === _brand) {
this[_brand] = _brand;
return;
}
const prefix = "Failed to construct 'Response'";
body = webidl.converters["BodyInit_DOMString?"](body, prefix, "Argument 1");
init = webidl.converters["ResponseInit_fast"](init, prefix, "Argument 2");
@ -320,7 +326,7 @@ class Response {
bodyWithType = extractBody(body);
}
initializeAResponse(this, init, bodyWithType);
this[webidl.brand] = webidl.brand;
this[_brand] = _brand;
}
/**
@ -489,7 +495,7 @@ function toInnerResponse(response) {
* @returns {Response}
*/
function fromInnerResponse(inner, guard) {
const response = webidl.createBranded(Response);
const response = new Response(_brand);
response[_response] = inner;
response[_headers] = headersFromHeaderList(inner.headerList, guard);
return response;