[Webkit-unassigned] [Bug 145605] Function.prototype.bind: Bound functions must use the [[Prototype]] of their target function instead of Function.prototype
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Fri Sep 11 14:21:24 PDT 2015
https://bugs.webkit.org/show_bug.cgi?id=145605
--- Comment #34 from Geoffrey Garen <ggaren at apple.com> ---
> error: invalid operands to binary expression ('JSC::JSValue' and
> 'JSC::FunctionPrototype *')
> bool hasDefaultPrototype = targetPrototype ==
> globalObject->functionPrototype();
To provide the right type, use JSValue(globalObject->functionPrototype()).
> error: comparison of distinct pointer types ('JSC::JSObject *' and
> 'JSC::FunctionPrototype *')
> bool hasDefaultPrototype = asObject(targetPrototype) ==
> globalObject->functionPrototype();
> ~~~~~~~~~~~~~~~~~~~~~~~~~ ^
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ````
>
> which I don't understand because as you rightly say, FunctionPrototype
> inherits from JSObject
In this formulation we have the right type but the compiler doesn't know it. So, you need to #include FunctionPrototype.h.
We shouldn't use this formulation, though, unless we can guarantee that the target callee in fact has a [[Prototype]]. I don't think we can guarantee that.
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