Fix incorrect slithIR conversion: internal call to inherited contract where considered as external call

Simplify removal of dupplicate node.* elements

slither/core/declarations/function.py

@@ -997,51 +997,34 @@ class Function(ChildContract, SourceMapping):
         calls = [x.calls_as_expression for x in self.nodes]
         calls = [x for x in calls if x]
         calls = [item for sublist in calls for item in sublist]
-        # Remove dupplicate if they share the same string representation
-        # TODO: check if groupby is still necessary here
-        calls = [next(obj) for i, obj in\
-                 groupby(sorted(calls, key=lambda x: str(x)), lambda x: str(x))]
-        self._expression_calls = calls
+        self._expression_calls = list(set(calls))
 
         internal_calls = [x.internal_calls for x in self.nodes]
         internal_calls = [x for x in internal_calls if x]
         internal_calls = [item for sublist in internal_calls for item in sublist]
-        internal_calls = [next(obj) for i, obj in
-                          groupby(sorted(internal_calls, key=lambda x: str(x)), lambda x: str(x))]
-        self._internal_calls = internal_calls
+        self._internal_calls = list(set(internal_calls))
 
         self._solidity_calls = [c for c in internal_calls if isinstance(c, SolidityFunction)]
 
         low_level_calls = [x.low_level_calls for x in self.nodes]
         low_level_calls = [x for x in low_level_calls if x]
         low_level_calls = [item for sublist in low_level_calls for item in sublist]
-        low_level_calls = [next(obj) for i, obj in
-                          groupby(sorted(low_level_calls, key=lambda x: str(x)), lambda x: str(x))]
-
-        self._low_level_calls = low_level_calls
+        self._low_level_calls = list(set(low_level_calls))
 
         high_level_calls = [x.high_level_calls for x in self.nodes]
         high_level_calls = [x for x in high_level_calls if x]
         high_level_calls = [item for sublist in high_level_calls for item in sublist]
-        high_level_calls = [next(obj) for i, obj in
-                          groupby(sorted(high_level_calls, key=lambda x: str(x)), lambda x: str(x))]
-
-        self._high_level_calls = high_level_calls
+        self._high_level_calls = list(set(high_level_calls))
 
         library_calls = [x.library_calls for x in self.nodes]
         library_calls = [x for x in library_calls if x]
         library_calls = [item for sublist in library_calls for item in sublist]
-        library_calls = [next(obj) for i, obj in
-                          groupby(sorted(library_calls, key=lambda x: str(x)), lambda x: str(x))]
-
-        self._library_calls = library_calls
+        self._library_calls = list(set(library_calls))
 
         external_calls_as_expressions = [x.external_calls_as_expressions for x in self.nodes]
         external_calls_as_expressions = [x for x in external_calls_as_expressions if x]
         external_calls_as_expressions = [item for sublist in external_calls_as_expressions for item in sublist]
-        external_calls_as_expressions = [next(obj) for i, obj in
-                          groupby(sorted(external_calls_as_expressions, key=lambda x: str(x)), lambda x: str(x))]
-        self._external_calls_as_expressions = external_calls_as_expressions
+        self._external_calls_as_expressions = list(set(external_calls_as_expressions))
 
 
 

slither/slithir/convert.py

@@ -230,7 +230,7 @@ def propagate_type_and_convert_call(result, node):
         ins = result[idx]
 
         if isinstance(ins, TmpCall):
-            new_ins = extract_tmp_call(ins)
+            new_ins = extract_tmp_call(ins, node.function.contract)
             if new_ins:
                 new_ins.set_node(ins.node)
                 ins = new_ins
@@ -323,12 +323,12 @@ def propagate_types(ir, node):
                     t_type = t.type
                     if isinstance(t_type, Contract):
                         contract = node.slither.get_contract_from_name(t_type.name)
-                        return convert_type_of_high_level_call(ir, contract)
+                        return convert_type_of_high_and_internal_level_call(ir, contract)
 
                 # Convert HighLevelCall to LowLevelCall
                 if isinstance(t, ElementaryType) and t.name == 'address':
                     if ir.destination.name == 'this':
-                        return convert_type_of_high_level_call(ir, node.function.contract)
+                        return convert_type_of_high_and_internal_level_call(ir, node.function.contract)
                     return convert_to_low_level(ir)
 
                 # Convert push operations
@@ -350,6 +350,8 @@ def propagate_types(ir, node):
                 ir.lvalue.set_type(ArrayType(t, length))
             elif isinstance(ir, InternalCall):
                 # if its not a tuple, return a singleton
+                if ir.function is None:
+                    convert_type_of_high_and_internal_level_call(ir, ir.contract)
                 return_type = ir.function.return_type
                 if return_type:
                     if len(return_type) == 1:
@@ -435,7 +437,7 @@ def propagate_types(ir, node):
                 logger.error('Not handling {} during type propgation'.format(type(ir)))
                 exit(-1)
 
-def extract_tmp_call(ins):
+def extract_tmp_call(ins, contract):
     assert isinstance(ins, TmpCall)
 
     if isinstance(ins.called, Variable) and isinstance(ins.called.type, FunctionType):
@@ -443,6 +445,11 @@ def extract_tmp_call(ins):
         call.call_id = ins.call_id
         return call
     if isinstance(ins.ori, Member):
+        # If there is a call on an inherited contract, it is an internal call
+        if ins.ori.variable_left in contract.inheritance + [contract]:
+            internalcall = InternalCall(ins.ori.variable_right, ins.ori.variable_left, ins.nbr_arguments, ins.lvalue, ins.type_call)
+            internalcall.call_id = ins.call_id
+            return internalcall
         if isinstance(ins.ori.variable_left, Contract):
             st = ins.ori.variable_left.get_structure_from_name(ins.ori.variable_right)
             if st:
@@ -457,7 +464,7 @@ def extract_tmp_call(ins):
         return msgcall
 
     if isinstance(ins.ori, TmpCall):
-        r = extract_tmp_call(ins.ori)
+        r = extract_tmp_call(ins.ori, contract)
         return r
     if isinstance(ins.called, SolidityVariableComposed):
         if str(ins.called) == 'block.blockhash':
@@ -671,7 +678,7 @@ def convert_type_library_call(ir, lib_contract):
         ir.lvalue = None
     return ir
 
-def convert_type_of_high_level_call(ir, contract):
+def convert_type_of_high_and_internal_level_call(ir, contract):
     func = None
     sigs = get_sig(ir)
     for sig in sigs:

slither/slithir/operations/internal_call.py

@@ -2,14 +2,20 @@ from slither.core.declarations.function import Function
 from slither.slithir.operations.call import Call
 from slither.slithir.operations.lvalue import OperationWithLValue
 from slither.core.variables.variable import Variable
-
+from slither.slithir.variables import Constant
 
 class InternalCall(Call, OperationWithLValue):
 
-    def __init__(self, function, nbr_arguments, result, type_call):
-        assert isinstance(function, Function)
+    def __init__(self, function, contract, nbr_arguments, result, type_call):
         super(InternalCall, self).__init__()
+        if isinstance(function, Function):
             self._function = function
+            self._function_name = function.name
+        else:
+            isinstance(function, Constant)
+            self._function = None
+            self._function_name = function
+        self._contract = contract
         self._nbr_arguments = nbr_arguments
         self._type_call = type_call
         self._lvalue = result
@@ -22,6 +28,18 @@ class InternalCall(Call, OperationWithLValue):
     def function(self):
         return self._function
 
+    @function.setter
+    def function(self, f):
+        self._function = f
+
+    @property
+    def contract(self):
+        return self._contract
+
+    @property
+    def function_name(self):
+        return self._function_name
+
     @property
     def nbr_arguments(self):
         return self._nbr_arguments

slither/slithir/utils/ssa.py

@@ -565,7 +565,7 @@ def copy_ir(ir, *instances):
         nbr_arguments = ir.nbr_arguments
         lvalue = get_variable(ir, lambda x: x.lvalue, *instances)
         type_call = ir.type_call
-        new_ir = InternalCall(function, nbr_arguments, lvalue, type_call)
+        new_ir = InternalCall(function, function.contract, nbr_arguments, lvalue, type_call)
         new_ir.arguments = get_arguments(ir, *instances)
         return new_ir
     elif isinstance(ir, InternalDynamicCall):

slither/visitors/slithir/expression_to_slithir.py

@@ -131,7 +131,7 @@ class ExpressionToSlithIR(ExpressionVisitor):
                 val = TupleVariable(self._node)
             else:
                 val = TemporaryVariable(self._node)
-            internal_call = InternalCall(called, len(args), val, expression.type_call)
+            internal_call = InternalCall(called, called.contract, len(args), val, expression.type_call)
             self._result.append(internal_call)
             set_val(expression, val)
         else: