slither/utils/similarity/encode.py

import os
import sys

from slither import Slither
from slither.slithir.operations import *
from slither.slithir.variables import *
from slither.core.declarations import *
from slither.solc_parsing.declarations.function import *

from slither.solc_parsing.variables.state_variable import *
from slither.solc_parsing.variables.local_variable import *
from slither.solc_parsing.variables.local_variable_init_from_tuple import *

def load_contracts(dirname, ext=None):
    r = []
    walk = list(os.walk(dirname))
    for x, y, files in walk:
        for f in files: 
            if ext is None or f.endswith(ext):
                r.append(x + "/".join(y) + "/" + f)
    return r

def ntype(_type):
    if type(_type) is not str:
        _type = str(_type)

    if "struct" in _type:
        return "struct"
    elif "enum" in _type:
        return "enum"
    elif "tuple" in _type:
        return "tuple"
    elif "contract" in _type:
        return "contract"
    elif "mapping" in _type:
        return "mapping"
    elif "." in _type or _type[0].isupper():
        return "<name>"
    else:
        return _type.replace(" ","_")

def encode_ir(ir):
    # operations
    if isinstance(ir, Assignment):
        return '({}):=({})'.format(encode_ir(ir.lvalue), encode_ir(ir.rvalue))
    if isinstance(ir, Index):
        return 'index({})'.format(ntype(ir._type)) 
    if isinstance(ir, Member):
        return 'member' #.format(ntype(ir._type))
    if isinstance(ir, Length):
        return 'length'
    if isinstance(ir, Balance):
        return 'balance'
    if isinstance(ir, Binary):
        return 'binary({})'.format(ir.type_str)
    if isinstance(ir, Unary):
        return 'unary({})'.format(ir.type_str) 
    if isinstance(ir, Condition):
        return 'condition({})'.format(encode_ir(ir.value))
    if isinstance(ir, NewStructure):
        return 'new_structure'
    if isinstance(ir, NewContract):
        return 'new_contract'
    if isinstance(ir, NewArray):
        return 'new_array({})'.format(ntype(ir._array_type)) 
    if isinstance(ir, NewElementaryType):
        return 'new_elementary({})'.format(ntype(ir._type)) 
    if isinstance(ir, Push):
        return 'push({},{})'.format(encode_ir(ir.value), encode_ir(ir.lvalue))
    if isinstance(ir, Delete):
        return 'delete({},{})'.format(encode_ir(ir.lvalue), encode_ir(ir.variable))
    if isinstance(ir, SolidityCall):
        return 'solidity_call({})'.format(ir.function.full_name)
    if isinstance(ir, InternalCall):
        return 'internal_call({})'.format(ntype(ir._type_call)) 
    if isinstance(ir, EventCall): # is this useful?
        return 'event'
    if isinstance(ir, LibraryCall):
        return 'library_call'
    if isinstance(ir, InternalDynamicCall):
        return 'internal_dynamic_call'
    if isinstance(ir, HighLevelCall): # TODO: improve
        return 'high_level_call'
    if isinstance(ir, LowLevelCall): # TODO: improve
        return 'low_level_call'
    if isinstance(ir, TypeConversion):
        return 'type_conversion({})'.format(ntype(ir.type))
    if isinstance(ir, Return): # this can be improved using values
        return 'return' #.format(ntype(ir.type))
    if isinstance(ir, Transfer):
        return 'transfer({})'.format(encode_ir(ir.call_value))
    if isinstance(ir, Send):
        return 'send({})'.format(encode_ir(ir.call_value))
    if isinstance(ir, Unpack): # TODO: improve
        return 'unpack'
    if isinstance(ir, InitArray): # TODO: improve
        return 'init_array'
    if isinstance(ir, FunctionSolc): # TODO: investigate this
        return 'function_solc'

    # variables
    if isinstance(ir, Constant):
        return 'constant({})'.format(ntype(ir._type))
    if isinstance(ir, SolidityVariableComposed):
        return 'solidity_variable_composed({})'.format(ir.name)
    if isinstance(ir, SolidityVariable):
        return 'solidity_variable{}'.format(ir.name)
    if isinstance(ir, TemporaryVariable):
        return 'temporary_variable'
    if isinstance(ir, ReferenceVariable):
        return 'reference({})'.format(ntype(ir._type)) 
    if isinstance(ir, LocalVariableSolc):
        return 'local_solc_variable({})'.format(ir._location) 
    if isinstance(ir, StateVariableSolc):
        return 'state_solc_variable({})'.format(ntype(ir._type))
    if isinstance(ir, LocalVariableInitFromTupleSolc):
        return 'local_variable_init_tuple'
    if isinstance(ir, TupleVariable):
        return 'tuple_variable'

    # default
    else:
        print(type(ir),"is missing encoding!")
        #sys.exit(1)
        return ''
 
def encode_contract(filename, solc):
    r = dict()

    # Init slither
    try: 
        slither = Slither(filename, solc=solc)
    except:
        print("Compilation failed")
        return r

    # Iterate over all the contracts
    for contract in slither.contracts:

        # Iterate over all the functions
        for function in contract.functions:

            # Dont explore inherited functions
            if function.contract == contract:

                if function.nodes == []:
                    continue

                x = "-".join([filename,contract.name,function.name]) 

                r[x] = []

                # Iterate over the nodes of the function
                for node in function.nodes:

                    # Print the Solidity expression of the nodes
                    # And the SlithIR operations
                    if node.expression:

                        #print('\tSolidity expression: {}'.format(node.expression))
                        #print('\tSlithIR:')
                        for ir in node.irs:
                            #print(ir)
                            r[x].append(encode_ir(ir))
                            #print('\t\t\t{}'.format(ir))
    return r