[Webkit-unassigned] [Bug 81742] New: RegExpMatchesArray should not copy the ovector

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=81742

           Summary: RegExpMatchesArray should not copy the ovector
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: barraclough at apple.com


Currently, all RegExpMatchesArray object contain Vector<int, 32>, used to hold any sub-pattern results.  This makes allocation/construction/destruction of these objects more expensive.  Instead, just store the main match, and recreate the sub-pattern ranges only if necessary (these are often only used for grouping, and the results never accessed).  If the main match (index 0) of the RegExpMatchesArray is accessed, reify that value alone.

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