Add list of ancestors to class struct

Author: maximecb

src/ast.rs

@@ -324,12 +324,19 @@ impl Function
 #[derive(Default, Clone, Debug)]
 pub struct Class
 {
+    // Class name
     pub name: String,
 
     // Name of the parent class
     pub parent_name: Option<String>,
 
-    // TODO: list of ancestors
+    // List of parent/ancestor classes
+    // Immediate parent listed first
+    pub ancestors: Vec<ClassId>,
+
+    // Flag to indicate this class has subclasses
+    // This is used to accelerate instanceof checks
+    pub subclassed: bool,
 
     // Map of field names to slot indices
     pub fields: HashMap<String, usize>,

src/parser.rs

@@ -1314,6 +1314,8 @@ fn parse_class(input: &mut Lexer, prog: &mut Program, pos: SrcPos) -> Result<(St
     let class_id = prog.reg_class(Class {
         name: class_name.clone(),
         parent_name,
+        ancestors: Vec::default(),
+        subclassed: false,
         fields: HashMap::default(),
         methods: methods.clone(),
         pos,