Merge pull request #449 from crytic/dev-true-false-branch

Node API: add true/false branchs for if statement

slither/core/cfg/node.py

@@ -2,6 +2,7 @@
     Node module
 """
 import logging
+from typing import Optional
 
 from slither.core.children.child_function import ChildFunction
 from slither.core.declarations import Contract
@@ -24,6 +25,7 @@ from slither.all_exceptions import SlitherException
 
 logger = logging.getLogger("Node")
 
+
 ###################################################################################
 ###################################################################################
 # region NodeType
@@ -31,7 +33,6 @@ logger = logging.getLogger("Node")
 ###################################################################################
 
 class NodeType:
-
     ENTRYPOINT = 0x0  # no expression
 
     # Node with expression
@@ -69,8 +70,7 @@ class NodeType:
     # Use for state variable declaration
     OTHER_ENTRYPOINT = 0x50
 
-
-#    @staticmethod
+    #    @staticmethod
     def str(t):
         if t == NodeType.ENTRYPOINT:
             return 'ENTRY_POINT'
@@ -118,6 +118,7 @@ def link_nodes(n1, n2):
     n1.add_son(n2)
     n2.add_father(n1)
 
+
 def insert_node(origin, node_inserted):
     sons = origin.sons
     link_nodes(origin, node_inserted)
@@ -127,6 +128,7 @@ def insert_node(origin, node_inserted):
 
         link_nodes(node_inserted, son)
 
+
 def recheable(node):
     '''
     Return the set of nodes reacheable from the node
@@ -167,7 +169,7 @@ class Node(SourceMapping, ChildFunction):
         self._dominators = set()
         self._immediate_dominator = None
         ## Nodes of the dominators tree
-        #self._dom_predecessors = set()
+        # self._dom_predecessors = set()
         self._dom_successors = set()
         # Dominance frontier
         self._dominance_frontier = set()
@@ -396,6 +398,7 @@ class Node(SourceMapping, ChildFunction):
             Include library calls
         """
         return list(self._library_calls)
+
     @property
     def low_level_calls(self):
         """
@@ -547,7 +550,6 @@ class Node(SourceMapping, ChildFunction):
     def add_inline_asm(self, asm):
         self._asm_source_code = asm
 
-
     # endregion
     ###################################################################################
     ###################################################################################
@@ -621,6 +623,20 @@ class Node(SourceMapping, ChildFunction):
         """
         return list(self._sons)
 
+    @property
+    def son_true(self) -> Optional["Node"]:
+        if self.type == NodeType.IF:
+            return self._sons[0]
+        else:
+            return None
+
+    @property
+    def son_false(self) -> Optional["Node"]:
+        if self.type == NodeType.IF and len(self._sons) >= 1:
+            return self._sons[1]
+        else:
+            return None
+
     # endregion
     ###################################################################################
     ###################################################################################
@@ -748,9 +764,6 @@ class Node(SourceMapping, ChildFunction):
         assert v == variable
         nodes.add(node)
 
-
-
-
     # endregion
     ###################################################################################
     ###################################################################################
@@ -809,7 +822,8 @@ class Node(SourceMapping, ChildFunction):
                     try:
                         self._high_level_calls.append((ir.destination.type.type, ir.function))
                     except AttributeError:
-                        raise SlitherException(f'Function not found on {ir}. Please try compiling with a recent Solidity version.')
+                        raise SlitherException(
+                            f'Function not found on {ir}. Please try compiling with a recent Solidity version.')
             elif isinstance(ir, LibraryCall):
                 assert isinstance(ir.destination, Contract)
                 self._high_level_calls.append((ir.destination, ir.function))
@@ -884,7 +898,6 @@ class Node(SourceMapping, ChildFunction):
         vars_read = [self._convert_ssa(x) for x in self._ssa_vars_read]
         vars_written = [self._convert_ssa(x) for x in self._ssa_vars_written]
 
-
         self._vars_read += [v for v in vars_read if v not in self._vars_read]
         self._state_vars_read = [v for v in self._vars_read if isinstance(v, StateVariable)]
         self._local_vars_read = [v for v in self._vars_read if isinstance(v, LocalVariable)]
@@ -893,7 +906,6 @@ class Node(SourceMapping, ChildFunction):
         self._state_vars_written = [v for v in self._vars_written if isinstance(v, StateVariable)]
         self._local_vars_written = [v for v in self._vars_written if isinstance(v, LocalVariable)]
 
-
     # endregion
     ###################################################################################
     ###################################################################################
@@ -902,7 +914,7 @@ class Node(SourceMapping, ChildFunction):
     ###################################################################################
 
     def __str__(self):
-        txt = NodeType.str(self._node_type) + ' '+ str(self.expression)
+        txt = NodeType.str(self._node_type) + ' ' + str(self.expression)
         return txt
 
     # endregion

slither/core/declarations/function.py

@@ -1111,6 +1111,14 @@ class Function(ChildContract, ChildInheritance, SourceMapping):
             if node.irs:
                 label += '\nIRs:\n' + '\n'.join([str(ir) for ir in node.irs])
             content += '{}[label="{}"];\n'.format(node.node_id, label)
+            if node.type == NodeType.IF:
+                true_node = node.son_true
+                if true_node:
+                    content += '{}->{}[label="True"];\n'.format(node.node_id, true_node.node_id)
+                false_node = node.son_false
+                if false_node:
+                    content += '{}->{}[label="False"];\n'.format(node.node_id, false_node.node_id)
+            else:
                 for son in node.sons:
                     content += '{}->{};\n'.format(node.node_id, son.node_id)