[Webkit-unassigned] [Bug 164582] New: [JSC] Default parameter part should be retrieved by op_get_argument opcode instead of changing parity

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=164582

            Bug ID: 164582
           Summary: [JSC] Default parameter part should be retrieved by
                    op_get_argument opcode instead of changing parity
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: utatane.tea at gmail.com

If you have a function like,

function func(a, b, options = {}) {
...
}

`func.length` is 2. But the number of parameters of this function is counted as 3.
So if you call it with the form `func(a, b)`, the arity check always fails.
But in the above case, not passing options is common.

Instead, we should retrieve the argument by using `op_get_argument`. It does not increase the arity.

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