Make `do_action` execute out of a code stack.

core/src/avm1.rs

@@ -100,9 +100,12 @@ impl<'gc> Avm1<'gc> {
         context: &mut ActionContext<'_, 'gc, '_>,
         code: &[u8],
     ) -> Result<(), Error> {
-        let mut reader = Reader::new(code, self.swf_version);
+        let mut pc_stack = vec![Reader::new(code, self.swf_version)];
 
-        while let Some(action) = reader.read_action()? {
+        while pc_stack.len() > 0 {
+            let mut reader = pc_stack.last_mut().unwrap();
+
+            if let Some(action) = reader.read_action()? {
                 use swf::avm1::types::Action;
                 let result = match action {
                     Action::Add => self.action_add(context),
@@ -219,6 +222,10 @@ impl<'gc> Avm1<'gc> {
                     log::error!("AVM1 error: {}", e);
                     return result;
                 }
+            } else {
+                //Out of code. Return to the parent function.
+                pc_stack.pop();
+            }
         }
 
         Ok(())