<snip>

    tx_state = message.tx_env.state

    refund_counter = U256(0)

    if message.target == Bytes0(b""):

        is_collision = account_has_code_or_nonce(

            tx_state, message.current_target

        ) or account_has_storage(tx_state, message.current_target)

        if is_collision:

            return MessageCallOutput(

                gas_left=Uint(0),

                refund_counter=U256(0),

                logs=tuple(),

                accounts_to_delete=set(),

                error=AddressCollision(),

            )

        else:

            evm = process_create_message(message)

    else:

        evm = process_message(message)

    if evm.error:

        logs: Tuple[Log, ...] = ()

        accounts_to_delete = set()

    else:

        logs = evm.logs

        accounts_to_delete = evm.accounts_to_delete

        refund_counter += U256(evm.refund_counter)

    tx_end = TransactionEnd(

        int(message.gas) - int(evm.gas_left), evm.output, evm.error

    )

    evm_trace(evm, tx_end)

    return MessageCallOutput(

        gas_left=evm.gas_left,

        refund_counter=refund_counter,

        logs=logs,

        accounts_to_delete=accounts_to_delete,

        error=evm.error,

    )

    <snip>

    tx_state = message.tx_env.state

    # take snapshot of state before processing the message

    snapshot = copy_tx_state(tx_state)

    # If the address where the account is being created has storage, it is

    # destroyed. This can only happen in the following highly unlikely

    # circumstances:

    # * The address created by a `CREATE` call collides with a subsequent

    #   `CREATE` or `CREATE2` call.

    # * The first `CREATE` happened before Spurious Dragon and left empty

    #   code.

    destroy_storage(tx_state, message.current_target)

    # In the previously mentioned edge case the preexisting storage is ignored

    # for gas refund purposes. In order to do this we must track created

    # accounts.

    mark_account_created(tx_state, message.current_target)

    increment_nonce(tx_state, message.current_target)

    evm = process_message(message)

    if not evm.error:

        contract_code = evm.output

        contract_code_gas = (

            ulen(contract_code) * GasCosts.CODE_DEPOSIT_PER_BYTE

        )

        try:

            if len(contract_code) > 0:

                if contract_code[0] == 0xEF:

                    raise InvalidContractPrefix

            charge_gas(evm, contract_code_gas)

            if len(contract_code) > MAX_CODE_SIZE:

                raise OutOfGasError

        except ExceptionalHalt as error:

            restore_tx_state(tx_state, snapshot)

            evm.gas_left = Uint(0)

            evm.output = b""

            evm.error = error

        else:

            set_code(tx_state, message.current_target, contract_code)

    else:

        restore_tx_state(tx_state, snapshot)

    return evm

    <snip>

    tx_state = message.tx_env.state

    if message.depth > STACK_DEPTH_LIMIT:

        raise StackDepthLimitError("Stack depth limit reached")

    code = message.code

    valid_jump_destinations = get_valid_jump_destinations(code)

    evm = Evm(

        pc=Uint(0),

        stack=[],

        memory=bytearray(),

        code=code,

        gas_left=message.gas,

        valid_jump_destinations=valid_jump_destinations,

        logs=(),

        refund_counter=0,

        running=True,

        message=message,

        output=b"",

        accounts_to_delete=set(),

        return_data=b"",

        error=None,

        accessed_addresses=message.accessed_addresses,

        accessed_storage_keys=message.accessed_storage_keys,

    )

    # take snapshot of state before processing the message

    snapshot = copy_tx_state(tx_state)

    if message.should_transfer_value and message.value != 0:

        move_ether(

            tx_state,

            message.caller,

            message.current_target,

            message.value,

        )

    try:

        if evm.message.code_address in PRE_COMPILED_CONTRACTS:

            evm_trace(evm, PrecompileStart(evm.message.code_address))

            PRE_COMPILED_CONTRACTS[evm.message.code_address](evm)

            evm_trace(evm, PrecompileEnd())

        else:

            while evm.running and evm.pc < ulen(evm.code):

                try:

                    op = Ops(evm.code[evm.pc])

                except ValueError as e:

                    raise InvalidOpcode(evm.code[evm.pc]) from e

                evm_trace(evm, OpStart(op))

                op_implementation[op](evm)

                evm_trace(evm, OpEnd())

            evm_trace(evm, EvmStop(Ops.STOP))

    except ExceptionalHalt as error:

        evm_trace(evm, OpException(error))

        evm.gas_left = Uint(0)

        evm.output = b""

        evm.error = error

    except Revert as error:

        evm_trace(evm, OpException(error))

        evm.error = error

    if evm.error:

        restore_tx_state(tx_state, snapshot)

    return evm