Move `_global` and `_root` to the MovieClip object, and implement `_parent` while we're in here.

core/src/avm1.rs

@@ -1017,15 +1017,6 @@ impl<'gc> Avm1<'gc> {
         let var_path = self.pop()?;
         let path = var_path.as_string()?;
 
-        // Special hardcoded variables
-        if path == "_root" {
-            self.push(self.root_object(context));
-            return Ok(());
-        } else if path == "_global" {
-            self.push(self.global_object(context));
-            return Ok(());
-        }
-
         let is_slashpath = Self::variable_name_is_slash_path(path);
         let mut result = None;
         if is_slashpath {

core/src/avm1/movie_clip.rs

@@ -1,6 +1,7 @@
 use crate::avm1::object::{Attribute::*, Object};
 use crate::avm1::Value;
 use crate::movie_clip::MovieClip;
+use enumset::EnumSet;
 use gc_arena::MutationContext;
 
 macro_rules! with_movie_clip {
@@ -80,5 +81,33 @@ pub fn create_movie_object<'gc>(gc_context: MutationContext<'gc, '_>) -> Object<
         }
     );
 
+    object.force_set_virtual(
+        "_global",
+        |avm, context, _this, _args| avm.global_object(context),
+        None,
+        EnumSet::new(),
+    );
+
+    object.force_set_virtual(
+        "_root",
+        |avm, context, _this, _args| avm.root_object(context),
+        None,
+        EnumSet::new(),
+    );
+
+    object.force_set_virtual(
+        "_parent",
+        |_avm, _context, this, _args| {
+            this.read()
+                .display_node()
+                .and_then(|mc| mc.read().parent())
+                .and_then(|dn| dn.read().object().as_object().ok())
+                .map(|o| Value::Object(o.to_owned()))
+                .unwrap_or(Value::Undefined)
+        },
+        None,
+        EnumSet::new(),
+    );
+
     object
 }