[Webkit-unassigned] [Bug 142295] New: optimize content extension backend

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=142295

            Bug ID: 142295
           Summary: optimize content extension backend
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: achristensen at apple.com

Some small optimizations go a long way.

There's no need to add duplicate actions to the serialized list as long as order is preserved.  We can't check the whole list to see if a duplicate action has been added, because that would break ignore-previous-rules, but we can check the previous action, which is where most of the duplicate actions will be.

Also, ignore-previous-rules ignores the previous rules only in that extension, but block can return early without processing other extensions.

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