mirror of
https://github.com/LadybirdBrowser/ladybird
synced 2026-04-26 01:35:08 +02:00
b629914428
Move owned ArrayBuffer storage directly when transferring stream buffers instead of copying the bytes before detaching the source. WebAssembly memory continues to copy because its ArrayBuffer wraps externally-owned storage. Preserve the abrupt completion from DetachArrayBuffer before moving storage so non-transferable buffers, such as WebAssembly.Memory-backed views, still surface TypeError through stream operations instead of aborting. This saves ~130ms of main thread time when loading a YouTube video on my Linux computer. :^)
64 lines
2.2 KiB
HTML
64 lines
2.2 KiB
HTML
<!DOCTYPE html>
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<script src="../include.js"></script>
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<script>
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asyncTest(async done => {
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{
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const stream = new ReadableStream({ type: "bytes" });
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const reader = stream.getReader({ mode: "byob" });
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const memory = new WebAssembly.Memory({ initial: 1 });
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const view = new Uint8Array(memory.buffer, 0, 8);
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try {
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await reader.read(view);
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println("FAIL: read() should reject");
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} catch (error) {
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println(`read() rejected with TypeError: ${error instanceof TypeError}`);
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}
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println(`Read buffer byteLength: ${memory.buffer.byteLength}`);
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}
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{
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let controller;
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new ReadableStream({
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type: "bytes",
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start(streamController) {
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controller = streamController;
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},
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});
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const memory = new WebAssembly.Memory({ initial: 1 });
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try {
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controller.enqueue(new Uint8Array(memory.buffer, 0, 8));
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println("FAIL: enqueue() should throw");
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} catch (error) {
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println(`enqueue() threw TypeError: ${error instanceof TypeError}`);
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}
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println(`Enqueue buffer byteLength: ${memory.buffer.byteLength}`);
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}
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{
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const memory = new WebAssembly.Memory({ initial: 1 });
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const stream = new ReadableStream({
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type: "bytes",
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pull(controller) {
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controller.byobRequest.respondWithNewView(new Uint8Array(memory.buffer, 0, 8));
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},
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});
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const reader = stream.getReader({ mode: "byob" });
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try {
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await reader.read(new Uint8Array(new ArrayBuffer(memory.buffer.byteLength), 0, 8));
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println("FAIL: read() should reject after respondWithNewView()");
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} catch (error) {
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println(`respondWithNewView() rejected with TypeError: ${error instanceof TypeError}`);
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}
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println(`RespondWithNewView buffer byteLength: ${memory.buffer.byteLength}`);
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}
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done();
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});
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</script>
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