[Webkit-unassigned] [Bug 16547] New: Perform return/continue/break syntax checking at parse time

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=16547

           Summary: Perform return/continue/break syntax checking at parse
                    time
           Product: WebKit
           Version: 525+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.4
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: eric at webkit.org
                CC: ggaren at apple.com


Perform return/continue/break syntax checking at parse time

There is no need for ReturnNode or ContinueNode or BreakNode to syntax check at
runtime (and needlessly branch in the common case), instead they could do all
their syntax checking with a similar "codeType()" variable, during parse time.

These branches are somewhat hot in function-heavy code.  One example I saw
tonight was the binary-trees test, where > 1% of total time is spent in
ReturnNode::execute()


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