Make entry_point return an Optional[Node] and update the detectors

Related to #1280
Fix #1279

examples/scripts/taint_mapping.py

@@ -10,6 +10,9 @@
 
 
 def visit_node(node, visited):
+    if node is None:
+        return
+
     if node in visited:
         return
 

slither/core/declarations/function.py

@@ -538,7 +538,7 @@ def nodes(self, nodes: List["Node"]):
         self._nodes = nodes
 
     @property
-    def entry_point(self) -> "Node":
+    def entry_point(self) -> Optional["Node"]:
         """
         Node: Entry point of the function
         """

slither/detectors/statements/calls_in_loop.py

@@ -1,4 +1,4 @@
-from typing import List
+from typing import List, Optional
 from slither.core.cfg.node import NodeType, Node
 from slither.detectors.abstract_detector import AbstractDetector, DetectorClassification
 from slither.core.declarations import Contract
@@ -22,7 +22,11 @@ def detect_call_in_loop(contract: Contract) -> List[Node]:
     return ret
 
 
-def call_in_loop(node: Node, in_loop_counter: int, visited: List[Node], ret: List[Node]) -> None:
+def call_in_loop(
+    node: Optional[Node], in_loop_counter: int, visited: List[Node], ret: List[Node]
+) -> None:
+    if node is None:
+        return
     if node in visited:
         return
     # shared visited

slither/detectors/statements/costly_operations_in_loop.py

@@ -1,4 +1,4 @@
-from typing import List
+from typing import List, Optional
 from slither.core.cfg.node import NodeType, Node
 from slither.detectors.abstract_detector import AbstractDetector, DetectorClassification
 from slither.core.declarations import Contract
@@ -17,8 +17,12 @@ def detect_costly_operations_in_loop(contract: Contract) -> List[Node]:
 
 
 def costly_operations_in_loop(
-    node: Node, in_loop_counter: int, visited: List[Node], ret: List[Node]
+    node: Optional[Node], in_loop_counter: int, visited: List[Node], ret: List[Node]
 ) -> None:
+
+    if node is None:
+        return
+
     if node in visited:
         return
     # shared visited

slither/detectors/statements/delegatecall_in_loop.py

@@ -1,4 +1,4 @@
-from typing import List
+from typing import List, Optional
 from slither.core.cfg.node import NodeType, Node
 from slither.detectors.abstract_detector import AbstractDetector, DetectorClassification
 from slither.slithir.operations import LowLevelCall, InternalCall
@@ -15,8 +15,12 @@ def detect_delegatecall_in_loop(contract: Contract) -> List[Node]:
 
 
 def delegatecall_in_loop(
-    node: Node, in_loop_counter: int, visited: List[Node], results: List[Node]
+    node: Optional[Node], in_loop_counter: int, visited: List[Node], results: List[Node]
 ) -> None:
+
+    if node is None:
+        return
+
     if node in visited:
         return
     # shared visited

slither/detectors/statements/msg_value_in_loop.py

@@ -1,4 +1,4 @@
-from typing import List
+from typing import List, Optional
 from slither.core.cfg.node import NodeType, Node
 from slither.detectors.abstract_detector import AbstractDetector, DetectorClassification
 from slither.slithir.operations import InternalCall
@@ -15,8 +15,12 @@ def detect_msg_value_in_loop(contract: Contract) -> List[Node]:
 
 
 def msg_value_in_loop(
-    node: Node, in_loop_counter: int, visited: List[Node], results: List[Node]
+    node: Optional[Node], in_loop_counter: int, visited: List[Node], results: List[Node]
 ) -> None:
+
+    if node is None:
+        return
+
     if node in visited:
         return
     # shared visited

slither/detectors/variables/uninitialized_local_variables.py

@@ -88,7 +88,11 @@ def _detect(self):
 
         for contract in self.compilation_unit.contracts:
             for function in contract.functions:
-                if function.is_implemented and function.contract_declarer == contract:
+                if (
+                    function.is_implemented
+                    and function.contract_declarer == contract
+                    and function.entry_point
+                ):
                     if function.contains_assembly:
                         continue
                     # dont consider storage variable, as they are detected by another detector

slither/detectors/variables/uninitialized_storage_variables.py

@@ -96,7 +96,7 @@ def _detect(self):
 
         for contract in self.compilation_unit.contracts:
             for function in contract.functions:
-                if function.is_implemented:
+                if function.is_implemented and function.entry_point:
                     uninitialized_storage_variables = [
                         v for v in function.local_variables if v.is_storage and v.uninitialized
                     ]