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Commit 158f6f7
stream: share webstreams async iterator methods
ReadableStream.prototype.values() built each iterator from an object
literal with a computed symbol-key method plus five closures. Such a
literal is rebuilt through the runtime on every evaluation, costing
close to a microsecond per iterator, which dominates iterating a
short-lived stream.
Move next() and return() to a shared ReadableStreamAsyncIterator
prototype, as for any WebIDL async iterator, and keep the per-iterator
state in its read request. The prototype chain and property shape are
the ones WPT checks; the placeholder AsyncIterator object in util.js is
no longer needed. As in WebIDL, next() and return() now reject when
called on something that is not a ReadableStream async iterator, and
iterators no longer carry own next/return properties.
Add an async-iterator kind to benchmark/webstreams/lifecycle.js.
webstreams/lifecycle.js kind='async-iterator' *** +16.22%
Signed-off-by: Matteo Collina <hello@matteocollina.com>
PR-URL: #66392
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>1 parent aff6017 commit 158f6f7
4 files changed
Lines changed: 239 additions & 158 deletions
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- benchmark/webstreams
- lib/internal/webstreams
- test/parallel
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