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2164f6b1eb
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.
70 lines
1.7 KiB
JavaScript
70 lines
1.7 KiB
JavaScript
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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"use strict";
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((window) => {
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const core = window.Deno.core;
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const ops = core.ops;
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const { BadResourcePrototype, InterruptedPrototype } = core;
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const {
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ArrayIsArray,
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ObjectPrototypeIsPrototypeOf,
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PromiseResolve,
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SymbolAsyncIterator,
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} = window.__bootstrap.primordials;
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class FsWatcher {
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#rid = 0;
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constructor(paths, options) {
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const { recursive } = options;
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this.#rid = ops.op_fs_events_open({ recursive, paths });
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}
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get rid() {
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return this.#rid;
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}
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async next() {
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try {
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const value = await core.opAsync("op_fs_events_poll", this.rid);
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return value
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? { value, done: false }
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: { value: undefined, done: true };
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} catch (error) {
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if (ObjectPrototypeIsPrototypeOf(BadResourcePrototype, error)) {
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return { value: undefined, done: true };
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} else if (
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ObjectPrototypeIsPrototypeOf(InterruptedPrototype, error)
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) {
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return { value: undefined, done: true };
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}
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throw error;
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}
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}
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// TODO(kt3k): This is deprecated. Will be removed in v2.0.
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// See https://github.com/denoland/deno/issues/10577 for details
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return(value) {
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core.close(this.rid);
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return PromiseResolve({ value, done: true });
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}
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close() {
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core.close(this.rid);
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}
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[SymbolAsyncIterator]() {
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return this;
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}
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}
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function watchFs(
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paths,
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options = { recursive: true },
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) {
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return new FsWatcher(ArrayIsArray(paths) ? paths : [paths], options);
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}
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window.__bootstrap.fsEvents = {
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watchFs,
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};
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})(this);
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