[Webkit-unassigned] [Bug 28701] New: How many copies of the parameters do you need?

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=28701

           Summary: How many copies of the parameters do you need?
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: barraclough at apple.com


The function parameters in JSC get copied a lot - and unnecessarily so.

Originally this happened due to duplicating FunctionBodyNodes on recompilation,
though the problem has been exacerbated by copying the parameters from the
original function body onto the executable, then back onto the real body that
will be generated (this happens on every function).  And this is all made worse
since the data structures in question are a little ugly - C style arrays of C++
objects containing ref counts, so they need a full copy-construct (rather than
a simple memcpy).

This can all be greatly simplified by just punting the parameters off into
their own ref-counted object, and forgoing all the copying.

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