Don't assume xdg_surface.{toplevel,popup} is non-NULL

This assumption will become incorrect with future commits.

tinywl/tinywl.c

@@ -122,8 +122,10 @@ static void focus_view(struct tinywl_view *view, struct wlr_surface *surface) {
 		struct wlr_xdg_surface *previous =
 			wlr_xdg_surface_try_from_wlr_surface(seat->keyboard_state.focused_surface);
 		assert(previous != NULL && previous->role == WLR_XDG_SURFACE_ROLE_TOPLEVEL);
+		if (previous->toplevel != NULL) {
 			wlr_xdg_toplevel_set_activated(previous->toplevel, false);
 		}
+	}
 	struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(seat);
 	/* Move the view to the front */
 	wlr_scene_node_raise_to_top(&view->scene_tree->node);

types/scene/xdg_shell.c

@@ -59,10 +59,12 @@ static void scene_xdg_surface_update_position(
 
 	if (xdg_surface->role == WLR_XDG_SURFACE_ROLE_POPUP) {
 		struct wlr_xdg_popup *popup = xdg_surface->popup;
+		if (popup != NULL) {
 			wlr_scene_node_set_position(&scene_xdg_surface->tree->node,
 				popup->current.geometry.x, popup->current.geometry.y);
 		}
 	}
+}
 
 static void scene_xdg_surface_handle_xdg_surface_commit(struct wl_listener *listener,
 		void *data) {

types/xdg_shell/wlr_xdg_popup.c

@@ -485,7 +485,7 @@ void wlr_xdg_popup_get_toplevel_coords(struct wlr_xdg_popup *popup,
 	struct wlr_surface *parent = popup->parent;
 	struct wlr_xdg_surface *xdg_surface;
 	while ((xdg_surface = wlr_xdg_surface_try_from_wlr_surface(parent))) {
-		if (xdg_surface->role == WLR_XDG_SURFACE_ROLE_POPUP) {
+		if (xdg_surface->role == WLR_XDG_SURFACE_ROLE_POPUP && xdg_surface->popup != NULL) {
 			popup_sx += xdg_surface->popup->current.geometry.x;
 			popup_sy += xdg_surface->popup->current.geometry.y;
 			parent = xdg_surface->popup->parent;

types/xdg_shell/wlr_xdg_surface.c

@@ -37,10 +37,14 @@ static void reset_xdg_surface(struct wlr_xdg_surface *surface) {
 
 	switch (surface->role) {
 	case WLR_XDG_SURFACE_ROLE_TOPLEVEL:
+	 	if (surface->toplevel != NULL) {
 			reset_xdg_toplevel(surface->toplevel);
+		}
 		break;
 	case WLR_XDG_SURFACE_ROLE_POPUP:
+	 	if (surface->popup != NULL) {
 			reset_xdg_popup(surface->popup);
+		}
 		break;
 	case WLR_XDG_SURFACE_ROLE_NONE:
 		break;
@@ -100,12 +104,16 @@ static void xdg_surface_handle_ack_configure(struct wl_client *client,
 		assert(0 && "not reached");
 		break;
 	case WLR_XDG_SURFACE_ROLE_TOPLEVEL:
+		if (surface->toplevel != NULL) {
 			handle_xdg_toplevel_ack_configure(surface->toplevel,
 				configure->toplevel_configure);
+		}
 		break;
 	case WLR_XDG_SURFACE_ROLE_POPUP:
+		if (surface->popup != NULL) {
 			handle_xdg_popup_ack_configure(surface->popup,
 				configure->popup_configure);
+		}
 		break;
 	}
 
@@ -137,12 +145,16 @@ static void surface_send_configure(void *user_data) {
 		assert(0 && "not reached");
 		break;
 	case WLR_XDG_SURFACE_ROLE_TOPLEVEL:
+	 	if (surface->toplevel != NULL) {
 			configure->toplevel_configure =
 				send_xdg_toplevel_configure(surface->toplevel);
+		}
 		break;
 	case WLR_XDG_SURFACE_ROLE_POPUP:
+		if (surface->popup != NULL) {
 			configure->popup_configure =
 				send_xdg_popup_configure(surface->popup);
+		}
 		break;
 	}
 
@@ -288,10 +300,14 @@ void xdg_surface_role_commit(struct wlr_surface *wlr_surface) {
 		// inert toplevel or popup
 		return;
 	case WLR_XDG_SURFACE_ROLE_TOPLEVEL:
+		if (surface->toplevel != NULL) {
 			handle_xdg_toplevel_committed(surface->toplevel);
+		}
 		break;
 	case WLR_XDG_SURFACE_ROLE_POPUP:
+		if (surface->popup != NULL) {
 			handle_xdg_popup_committed(surface->popup);
+		}
 		break;
 	}
 
@@ -391,12 +407,16 @@ void destroy_xdg_surface_role_object(struct wlr_xdg_surface *surface) {
 
 	switch (surface->role) {
 	case WLR_XDG_SURFACE_ROLE_TOPLEVEL:
+		if (surface->toplevel != NULL) {
 			destroy_xdg_toplevel(surface->toplevel);
 			surface->toplevel = NULL;
+		}
 		break;
 	case WLR_XDG_SURFACE_ROLE_POPUP:
+		if (surface->popup != NULL) {
 			destroy_xdg_popup(surface->popup);
 			surface->popup = NULL;
+		}
 		break;
 	case WLR_XDG_SURFACE_ROLE_NONE:
 		// This space is intentionally left blank