add support for self.balance

slither/core/declarations/solidity_variables.py

@@ -39,6 +39,7 @@ SOLIDITY_VARIABLES_COMPOSED = {
     # Vyper
     "chain.id": "uint256",
     "block.prevhash": "bytes32",
+    "self.balance": "uint256",
 
 }
 

slither/vyper_parsing/expressions/expression_parsing.py

@@ -368,7 +368,7 @@ def parse_expression(expression: Dict, caller_context) -> "Expression":
         member_name = expression.attr
         if isinstance(expression.value, Name):
 
-            if expression.value.id  == "self":
+            if expression.value.id  == "self" and member_name != "balance":
                 var, was_created = find_variable(member_name, caller_context)
                 # TODO replace with self
                 if was_created: