[Webkit-unassigned] [Bug 152181] Refactoring HTMLMediaElement getStartDate() implementation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=152181

--- Comment #16 from Darin Adler <darin at apple.com> ---
Comment on attachment 270113
  --> https://bugs.webkit.org/attachment.cgi?id=270113
Make sure HTMLMediaElement getStartDate() always returns a valid Date object

View in context: https://bugs.webkit.org/attachment.cgi?id=270113&action=review

This doesn’t seem right. Is it really acceptable to create a date object with the value NaN?

Why no new test case? What’s the point of making this change if it doesn’t fix a bug?

> Source/WebCore/bindings/js/JSDOMBinding.cpp:120
> +JSValue jsDate(ExecState* exec, double value)
> +{
> +    return DateInstance::create(exec->vm(), exec->lexicalGlobalObject()->dateStructure(), value);
> +}

What does this function do if it’s passed null or infinity? Is it legal to create a date instance with such values? Is it a programming error to call this? If so, then should something ASSERT(std::isfinite(value))? Maybe DateInstance::create already does that?

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