Fix HomeObject for private class methods (#3897)

core/engine/src/bytecompiler/class.rs

@@ -423,21 +423,33 @@ impl ByteCompiler<'_> {
                             self.emit_with_varying_operand(Opcode::PushClassPrivateSetter, index);
                         }
                         MethodDefinition::Ordinary(expr) => {
+                            self.emit(Opcode::RotateLeft, &[Operand::U8(3)]);
+                            self.emit_opcode(Opcode::Dup);
+                            self.emit(Opcode::RotateRight, &[Operand::U8(4)]);
                             self.method(expr.into());
                             let index = self.get_or_insert_private_name(*name);
                             self.emit_with_varying_operand(Opcode::PushClassPrivateMethod, index);
                         }
                         MethodDefinition::Async(expr) => {
+                            self.emit(Opcode::RotateLeft, &[Operand::U8(3)]);
+                            self.emit_opcode(Opcode::Dup);
+                            self.emit(Opcode::RotateRight, &[Operand::U8(4)]);
                             self.method(expr.into());
                             let index = self.get_or_insert_private_name(*name);
                             self.emit_with_varying_operand(Opcode::PushClassPrivateMethod, index);
                         }
                         MethodDefinition::Generator(expr) => {
+                            self.emit(Opcode::RotateLeft, &[Operand::U8(3)]);
+                            self.emit_opcode(Opcode::Dup);
+                            self.emit(Opcode::RotateRight, &[Operand::U8(4)]);
                             self.method(expr.into());
                             let index = self.get_or_insert_private_name(*name);
                             self.emit_with_varying_operand(Opcode::PushClassPrivateMethod, index);
                         }
                         MethodDefinition::AsyncGenerator(expr) => {
+                            self.emit(Opcode::RotateLeft, &[Operand::U8(3)]);
+                            self.emit_opcode(Opcode::Dup);
+                            self.emit(Opcode::RotateRight, &[Operand::U8(4)]);
                             self.method(expr.into());
                             let index = self.get_or_insert_private_name(*name);
                             self.emit_with_varying_operand(Opcode::PushClassPrivateMethod, index);

core/engine/src/vm/opcode/mod.rs

@@ -1450,7 +1450,7 @@ generate_opcodes! {
     ///
     /// Operands: index: `u32`
     ///
-    /// Stack: class, method **=>**
+    /// Stack: class, class_proto, method **=>**
     PushClassPrivateMethod { index: VaryingOperand },
 
     /// Deletes a property by name of an object.

core/engine/src/vm/opcode/push/class/private.rs

@@ -20,6 +20,12 @@ impl PushClassPrivateMethod {
         let name = context.vm.frame().code_block().constant_string(index);
         let method = context.vm.pop();
         let method_object = method.as_callable().expect("method must be callable");
+        let class_proto = context.vm.pop();
+        let class_proto_object = class_proto
+            .as_object()
+            .expect("class_proto must be function object");
+        let class = context.vm.pop();
+        let class_object = class.as_object().expect("class must be function object");
 
         let name_string = js_string!(js_str!("#"), &name);
         let desc = PropertyDescriptor::builder()
@@ -35,9 +41,10 @@ impl PushClassPrivateMethod {
                 &mut InternalMethodContext::new(context),
             )
             .expect("failed to set name property on private method");
-
-        let class = context.vm.pop();
-        let class_object = class.as_object().expect("class must be function object");
+        method_object
+            .downcast_mut::<OrdinaryFunction>()
+            .expect("method must be function object")
+            .set_home_object(class_proto_object.clone());
 
         class_object
             .downcast_mut::<OrdinaryFunction>()