Re: JS 45 problem

On 5/24/16 10:32 AM, Kent Williams wrote:
>         obj = JS_NewObject(cx, &TESTO);

Kent,

This line is the problem.  JS_NewObject used to guess at the prototype 
to use based on the name of the given class and what that name resolved 
to in global scope.

This was all sorts of broken and fragile, and was removed (see 
<https://bugzilla.mozilla.org/show_bug.cgi?id=1125567>).  If you use 
JS_NewObject, you will get an object whose prototype is Object.prototype.

What you want here is JS_NewObjectWithGivenProto and pass in the thing 
you want as your prototype.

I think you have a few options for how to do that:

1)  Save the value returned from JS_InitClass and use that.  Should be 
the right thing as long as no one is subclassing you.

2)  In the constructor, get the "prototype" property of args.callee() 
and use that.  Again, should be the right thing as long as no one is 
subclassing you.

3)  In the constructor, get the "prototype" property of 
args.newTarget().  Should do the right thing (as in, use the proto of 
the constructor that was actually invoked) even if you're subclassed.

-Boris