report panic to embedder

components/compositing/compositor_thread.rs

@@ -146,6 +146,8 @@ pub enum EmbedderMsg {
     LoadStart(TopLevelBrowsingContextId),
     /// The load of a page has completed
     LoadComplete(TopLevelBrowsingContextId),
+    /// A pipeline panicked. First string is the reason, second one is the backtrace.
+    Panic(TopLevelBrowsingContextId, String, Option<String>),
 }
 
 /// Messages from the painting thread and the constellation thread to the compositor thread.
@@ -237,6 +239,7 @@ impl Debug for EmbedderMsg {
             EmbedderMsg::SetFullscreenState(..) => write!(f, "SetFullscreenState"),
             EmbedderMsg::LoadStart(..) => write!(f, "LoadStart"),
             EmbedderMsg::LoadComplete(..) => write!(f, "LoadComplete"),
+            EmbedderMsg::Panic(..) => write!(f, "Panic"),
         }
     }
 }

components/compositing/windowing.rs

@@ -189,4 +189,7 @@ pub trait WindowMethods {
     /// will want to avoid blocking on UI events, and just
     /// run the event loop at the vsync interval.
     fn set_animation_state(&self, _state: AnimationState) {}
+
+    /// Called when a pipeline panics.
+    fn handle_panic(&self, browser_id: TopLevelBrowsingContextId, reason: String, backtrace: Option<String>);
 }

components/constellation/constellation.rs

@@ -1482,7 +1482,7 @@ impl<Message, LTF, STF> Constellation<Message, LTF, STF>
     fn handle_panic(&mut self,
                     top_level_browsing_context_id: TopLevelBrowsingContextId,
                     reason: String,
-                    _backtrace: Option<String>)
+                    backtrace: Option<String>)
     {
         if opts::get().hard_fail {
             // It's quite difficult to make Servo exit cleanly if some threads have failed.
@@ -1495,7 +1495,7 @@ impl<Message, LTF, STF> Constellation<Message, LTF, STF>
 
         let browsing_context_id = BrowsingContextId::from(top_level_browsing_context_id);
 
-        // FIXME: report to embedder: (top_level_browsing_context_id, reason, backtrace);
+        self.embedder_proxy.send(EmbedderMsg::Panic(top_level_browsing_context_id, reason, backtrace));
 
         let (window_size, pipeline_id) = {
             let browsing_context = self.browsing_contexts.get(&browsing_context_id);

components/servo/lib.rs

@@ -457,6 +457,11 @@ impl<Window> Servo<Window> where Window: WindowMethods + 'static {
                     // TODO(pcwalton): Specify which frame's load completed.
                     self.compositor.window.load_end(top_level_browsing_context);
                 },
+                (EmbedderMsg::Panic(top_level_browsing_context, reason, backtrace),
+                 ShutdownState::NotShuttingDown) => {
+                    self.compositor.window.handle_panic(top_level_browsing_context, reason, backtrace);
+                },
+
             }
         }
     }