Implemented some more native methods

src/classfile.rs

@@ -854,6 +854,24 @@ impl Into<String> for &AbstractTypeDescription {
 
 impl AbstractTypeDescription {
 
+    pub fn storage_size(&self) -> u8 {
+        match self.array_level {
+            0 => match self.kind {
+                AbstractTypeKind::Void() => 0,
+                AbstractTypeKind::Byte() => 1,
+                AbstractTypeKind::Char() => 2,
+                AbstractTypeKind::Double() => 8,
+                AbstractTypeKind::Float() => 4,
+                AbstractTypeKind::Int() => 4,
+                AbstractTypeKind::Long() => 8,
+                AbstractTypeKind::Short() => 2,
+                AbstractTypeKind::Boolean() => 1,
+                AbstractTypeKind::Classname(_) => 8
+            }
+            _ => 8
+        }
+    }
+
     pub fn super_component(&self) -> Self {
         AbstractTypeDescription {
             array_level: 0,
@@ -927,6 +945,14 @@ impl AbstractTypeDescription {
             kind: AbstractTypeKind::Classname(name.to_string()),
         }
     }
+
+    pub fn extract_class_name(&self) -> &String {
+        match self.kind {
+            AbstractTypeKind::Classname(ref name) => name,
+            _ => unreachable!()
+        }
+    }
+
 }
 
 #[derive(Debug, Eq, PartialEq)]