Mouse movements leading to crash with cocoa

[tomaka]

From glium/glium#425 (comment):

Running the window example from Glutin has the same error, keyboard and clicks work fine, while mouse movement crashes with this crash report: http://pastebin.com/VjV4gWzd

[mystise]

All examples have the same error for me, except for multi window, as that dispatches 3 separate threads (Which crashes even before I move the mouse)

[mystise]

Multi window crash report: http://pastebin.com/a2bDTwhP

[simnalamburt]

My smallest error reproduction

extern crate glutin;

fn main() {
    let window = glutin::Window::new().unwrap();
    let mut it = window.wait_events();
    loop { it.next(); }
}

Stack traces

1. https://github.com/servo/rust-cocoa/blob/master/src/appkit.rs#L1850
2. https://github.com/tomaka/glutin/blob/master/src/cocoa/mod.rs#L441
3. https://github.com/tomaka/glutin/blob/master/src/cocoa/mod.rs#L522
4. https://github.com/tomaka/glutin/blob/master/src/lib.rs#L577
5. https://github.com/tomaka/glutin/blob/master/src/lib.rs#L768
6. https://github.com/simnalamburt/glutin-bug/blob/master/src/main.rs#L6

---

Summary: objc_msgSend_stret call with @selector(locationInWindow) failed with EXC_BAD_ACCESS.

[tomaka]

Oh that's probably useful!

cc @bjz

[brendanzab]

Thanks! I'll have to fix the rust-cocoa bindings. For now we can call msgSend_stret directly. It'll be a few hours before I get home, but if you submit a PR that does something like: msgSend_stret()(..., selector("locationInWindow")) I can hit merge for you.

[brendanzab]

Ugh, seems I caused a regression in servo/cocoa-rs#59. It's really hard to know what needs msgSend vs msgSend_stret... sorry!

[brendanzab]

And thanks for the awesome sleuthing @simnalamburt, I knew exactly what to fix!

[brendanzab]

What are you using for the stack trace? Instruments.app?

[simnalamburt]

Wow! @bjz, thanks for your fix.

Actually that was just Xcode debugger (graphical lldb frontend). I'm pretty new with OS X, even don't know what msgSend_stret is, I just choosed Xcode just because it was already installed in my MBA and it looks easier than CLI lldb. Instruments.app looks awesome by the way! (Real time resource inspector, OpenGL inspector, etc)

[brendanzab]

It would be great if you could do a tutorial on it - I prefer a graphical debugger to the command line.