• caitpotter88's avatar
    [esnext] use map instance_descriptors() when possible in Object.values/entries() · cee0dca2
    caitpotter88 authored
    When possible (non-Proxy receiver, expecting only String-names), walk the instance_descriptors() array rather than performing [[OwnPropertyKeys]]. If the map changes during a call to an accessor property, resort to a slower property lookup.
    
    For now, the fast path is not taken if the object contains any element keys.
    
    Offers a measurable improvement over the existing version, in select situations.
    
    BUG=v8:4663
    LOG=N
    R=cbruni@chromium.org, verwaest@chromium.org, adamk@chromium.org
    
    Review URL: https://codereview.chromium.org/1751643003
    
    Cr-Commit-Position: refs/heads/master@{#34567}
    cee0dca2
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