[Webkit-unassigned] [Bug 49385] New: Reduce the size of the RegexStackSpaceForBackTrackInfoParentheses in YARR

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=49385

           Summary: Reduce the size of the
                    RegexStackSpaceForBackTrackInfoParentheses in YARR
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: pvarga at inf.u-szeged.hu
                CC: barraclough at apple.com, zherczeg at webkit.org,
                    msaboff at apple.com


The BackTrackInfoParentheses struct in YARR Interpreter stores two members (prevBegin, prevEnd) which are unnecessary for
the current matching logic. These are storing the last successful match of a parentheses. The result of match is restored
from these members in case of backtrack but this isn't needed because the recordParenthesesMatch() or the resetMatches() 
function updates the result of match in every case.

NOTE: This modification is needed just in the Interpreter because the JIT doesn't store
backtrack information of iterative parentheses for the time being.

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