- 13 Feb, 2018 1 commit
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Benedikt Meurer authored
The idea here is that in case the `thenable` is a JSPromise and `then` is the initial `Promise.prototype.then` method, and the @@species lookup chain is intact, we can skip creating the temporary promise and the closures (with the shared context), and instead directly call into our PerformPromiseThen. This is sound since - given above mentioned conditions - our short-cut PerformPromiseThen(thenable, undefined, undefined, promise_to_resolve) is not observably different from the actual resolve, reject = CreateResolvingFunctions(promise_to_resolve) result_capability = NewPromiseCapability(%Promise%) PerformPromiseThen(thenable, resolve, reject, result_capability) except through PromiseHooks (and potentially via the async stack traces). So we disable the fast-path if either promise hooks are enabled or the debugger is active for now. This improves the performance on the wikipedia benchmark by 20-25% and the bluebird-doxbee benchmark by around 20%. Bug: v8:7253 Change-Id: I23c92ad365c2b71d65057573f2d8febe2afe00b0 Reviewed-on: https://chromium-review.googlesource.com/911800 Commit-Queue: Benedikt Meurer <bmeurer@chromium.org> Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org> Cr-Commit-Position: refs/heads/master@{#51261}
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