On Mon, Nov 17, 2014 at 6:10 AM, Francisco Tolmasky <tolma...@gmail.com> wrote:
> I am writing an application that wants to examine the state of an
> application without mutating it.
> If the application throws an error, I'd like to be able to grab the string
> stack trace located in error.stack.
> In JSCore for example, this isn't a problem because I can do
> Object.getOwnPropertyDescriptor(error, "stack").value.
> However, in v8, stack is a getter/setter, not a value. This would maybe not
> be a problem if I could do something like
> Error.prototype.stack.apply(myError). But, as it turns out it is a *unique*
> getter for every error:
> Object.getOwnPropertyDescriptor(new Error, "stack").get !==
> Object.getOwnPropertyDescriptor(new Error, "stack").get.
> As such, I would at the very least like to be able to make sure that its the
> normal stack getter (in which case I can feel
> safe that its not doing any funny business for example if the user has
> overwritten it with their own custom stack getter
> that mutates the state of the program, or possibly throws an exception
> itself!). So far the best I can come up with is to check
> whether the source of the getter is "function() { [native code] }" which is
> obviously not ideal since this doesn't preclude the user
> havign set the stack getter to a *different* native function. Is there any
> way to achieve what I want that I'm missing?
>
> Thanks,
>
> Francisco
I don't think it's possible to do directly but you can probably abuse
the debug API for this.
Start V8 with --expose_debug_as=Debug or evaluate the string 'Debug'
in the debug context (see v8::Debug::GetDebugContext() in
include/v8-debug.h), then execute the following:
var err = /* ... */;
var des = Object.getOwnPropertyDescriptor(err, 'stack');
if (des == null || des.get == null) return;
var debug = Debug.Debug || Debug;
var script = debug.findScript(des.get);
if (script == null || script.name !== 'native messages.js') return;
// err.stack should be safe.
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