def look_for_library(contract, ir, node, using_for, t):
for destination in using_for[t]:
lib_contract = contract.slither.get_contract_from_name(
str(destination))
if lib_contract:
lib_call = LibraryCall(lib_contract, ir.function_name,
ir.nbr_arguments, ir.lvalue, ir.type_call)
lib_call.set_expression(ir.expression)
lib_call.call_gas = ir.call_gas
lib_call.arguments = [ir.destination] + ir.arguments
new_ir = convert_type_library_call(lib_call, lib_contract)
if new_ir:
new_ir.set_node(ir.node)
return new_ir
return None
def extract_tmp_call(ins, contract):
assert isinstance(ins, TmpCall)
if isinstance(ins.called, Variable) and isinstance(ins.called.type, FunctionType):
call = InternalDynamicCall(ins.lvalue, ins.called, ins.called.type)
call.set_expression(ins.expression)
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 or an event
if ins.ori.variable_left in contract.inheritance + [contract]:
if str(ins.ori.variable_right) in [f.name for f in contract.functions]:
internalcall = InternalCall((ins.ori.variable_right, ins.ori.variable_left.name), ins.nbr_arguments,
ins.lvalue, ins.type_call)
internalcall.set_expression(ins.expression)
internalcall.call_id = ins.call_id
return internalcall
if str(ins.ori.variable_right) in [f.name for f in contract.events]:
eventcall = EventCall(ins.ori.variable_right)
eventcall.set_expression(ins.expression)
eventcall.call_id = ins.call_id
return eventcall
if isinstance(ins.ori.variable_left, Contract):
st = ins.ori.variable_left.get_structure_from_name(ins.ori.variable_right)
if st:
op = NewStructure(st, ins.lvalue)
op.set_expression(ins.expression)
op.call_id = ins.call_id
return op
libcall = LibraryCall(ins.ori.variable_left, ins.ori.variable_right, ins.nbr_arguments, ins.lvalue,
ins.type_call)
libcall.set_expression(ins.expression)
libcall.call_id = ins.call_id
return libcall
msgcall = HighLevelCall(ins.ori.variable_left, ins.ori.variable_right, ins.nbr_arguments, ins.lvalue,
ins.type_call)
msgcall.call_id = ins.call_id
if ins.call_gas:
msgcall.call_gas = ins.call_gas
if ins.call_value:
msgcall.call_value = ins.call_value
msgcall.set_expression(ins.expression)
return msgcall
if isinstance(ins.ori, TmpCall):
r = extract_tmp_call(ins.ori, contract)
r.set_node(ins.node)
return r
if isinstance(ins.called, SolidityVariableComposed):
if str(ins.called) == 'block.blockhash':
ins.called = SolidityFunction('blockhash(uint256)')
elif str(ins.called) == 'this.balance':
s = SolidityCall(SolidityFunction('this.balance()'), ins.nbr_arguments, ins.lvalue, ins.type_call)
s.set_expression(ins.expression)
return s
if isinstance(ins.called, SolidityFunction):
s = SolidityCall(ins.called, ins.nbr_arguments, ins.lvalue, ins.type_call)
s.set_expression(ins.expression)
return s
if isinstance(ins.ori, TmpNewElementaryType):
n = NewElementaryType(ins.ori.type, ins.lvalue)
n.set_expression(ins.expression)
return n
if isinstance(ins.ori, TmpNewContract):
op = NewContract(Constant(ins.ori.contract_name), ins.lvalue)
op.set_expression(ins.expression)
op.call_id = ins.call_id
return op
if isinstance(ins.ori, TmpNewArray):
n = NewArray(ins.ori.depth, ins.ori.array_type, ins.lvalue)
n.set_expression(ins.expression)
return n
if isinstance(ins.called, Structure):
op = NewStructure(ins.called, ins.lvalue)
op.set_expression(ins.expression)
op.call_id = ins.call_id
op.set_expression(ins.expression)
return op
if isinstance(ins.called, Event):
e = EventCall(ins.called.name)
e.set_expression(ins.expression)
return e
if isinstance(ins.called, Contract):
# Called a base constructor, where there is no constructor
if ins.called.constructor is None:
return Nop()
# Case where:
# contract A{ constructor(uint) }
# contract B is A {}
# contract C is B{ constructor() A(10) B() {}
# C calls B(), which does not exist
# Ideally we should compare here for the parameters types too
if len(ins.called.constructor.parameters) != ins.nbr_arguments:
return Nop()
internalcall = InternalCall(ins.called.constructor, ins.nbr_arguments, ins.lvalue,
ins.type_call)
internalcall.call_id = ins.call_id
internalcall.set_expression(ins.expression)
return internalcall
raise Exception('Not extracted {} {}'.format(type(ins.called), ins))
