Bug 158754

Summary: The Array species constructor watchpoints should be created the first time they are needed rather than on creation
Product: WebKit Reporter: Keith Miller <keith_miller>
Component: New BugsAssignee: Keith Miller <keith_miller>
Status: RESOLVED FIXED    
Severity: Normal CC: benjamin, commit-queue, mark.lam, msaboff, saam
Priority: P2    
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
Patch
benjamin: review+
Micro-benchmark results none

Description Keith Miller 2016-06-14 14:25:25 PDT 
The Array species constructor watchpoints should be created the first time they are needed rather than on creation
Comment 1 Keith Miller 2016-06-14 14:41:32 PDT 
Created attachment 281281 [details]
Patch
Comment 2 Keith Miller 2016-06-14 14:42:28 PDT 
Created attachment 281282 [details]
Micro-benchmark results
Comment 3 Benjamin Poulain 2016-06-14 14:59:08 PDT 
Comment on attachment 281281 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=281281&action=review

> Source/JavaScriptCore/runtime/ArrayPrototype.cpp:1110
> +    // And that Array[Symbol.species] is the primordial GetterSetter.

And -> and
Comment 4 Benjamin Poulain 2016-06-14 15:00:19 PDT 
Maybe add 2 tests where you warm up with-the-original-constructor/without-species, then modify, and run a loop again verifying the changes.
Comment 5 Keith Miller 2016-06-14 15:32:33 PDT 
Committed r202067: <http://trac.webkit.org/changeset/202067>