def apply_create_message(self, computation: BaseComputation, child_msg: Message) -> None:
child_computation = computation.apply_child_computation(child_msg)
if child_computation.is_error:
computation.stack_push_int(0)
else:
computation.stack_push_bytes(child_msg.storage_address)
computation.return_gas(child_computation.get_gas_remaining())
def __call__(self, computation: BaseComputation) -> None:
stack_data = self.get_stack_data(computation)
gas_cost = self.get_gas_cost(stack_data)
computation.consume_gas(gas_cost, reason=self.mnemonic)
computation.extend_memory(stack_data.memory_start,
stack_data.memory_length)
insufficient_funds = computation.state.account_db.get_balance(
computation.msg.storage_address) < stack_data.endowment
stack_too_deep = computation.msg.depth + 1 > constants.STACK_DEPTH_LIMIT
if insufficient_funds or stack_too_deep:
computation.stack_push(0)
return
call_data = computation.memory_read(stack_data.memory_start,
stack_data.memory_length)
create_msg_gas = self.max_child_gas_modifier(
computation.get_gas_remaining())
computation.consume_gas(create_msg_gas, reason=self.mnemonic)
contract_address = self.generate_contract_address(
stack_data, call_data, computation)
is_collision = computation.state.account_db.account_has_code_or_nonce(
contract_address)
if is_collision:
self.logger.debug2(
"Address collision while creating contract: %s",
encode_hex(contract_address),
)
computation.stack_push(0)
return
child_msg = computation.prepare_child_message(
gas=create_msg_gas,
to=constants.CREATE_CONTRACT_ADDRESS,
value=stack_data.endowment,
data=b'',
code=call_data,
create_address=contract_address,
)
child_computation = computation.apply_child_computation(child_msg)
if child_computation.is_error:
computation.stack_push(0)
else:
computation.stack_push(contract_address)
computation.return_gas(child_computation.get_gas_remaining())
def apply_create_message(self, computation: BaseComputation, child_msg: Message) -> None:
# We need to ensure that creation operates on empty storage **and**
# that if the initialization code fails that we revert the account back
# to its original state root.
snapshot = computation.state.snapshot()
computation.state.delete_storage(child_msg.storage_address)
child_computation = computation.apply_child_computation(child_msg)
if child_computation.is_error:
computation.state.revert(snapshot)
computation.stack_push_int(0)
else:
computation.state.commit(snapshot)
computation.stack_push_bytes(child_msg.storage_address)
computation.return_gas(child_computation.get_gas_remaining())
def __call__(self, computation: BaseComputation) -> None:
computation.consume_gas(
self.gas_cost,
reason=self.mnemonic,
)
(
gas,
value,
to,
sender,
code_address,
memory_input_start_position,
memory_input_size,
memory_output_start_position,
memory_output_size,
should_transfer_value,
is_static,
) = self.get_call_params(computation)
computation.extend_memory(memory_input_start_position,
memory_input_size)
computation.extend_memory(memory_output_start_position,
memory_output_size)
call_data = computation.memory_read(memory_input_start_position,
memory_input_size)
#
# Message gas allocation and fees
#
child_msg_gas, child_msg_gas_fee = self.compute_msg_gas(
computation, gas, to, value)
computation.consume_gas(child_msg_gas_fee, reason=self.mnemonic)
# Pre-call checks
sender_balance = computation.state.account_db.get_balance(
computation.msg.storage_address)
insufficient_funds = should_transfer_value and sender_balance < value
stack_too_deep = computation.msg.depth + 1 > constants.STACK_DEPTH_LIMIT
if insufficient_funds or stack_too_deep:
computation.return_data = b''
if insufficient_funds:
err_message = "Insufficient Funds: have: {0} | need: {1}".format(
sender_balance,
value,
)
elif stack_too_deep:
err_message = "Stack Limit Reached"
else:
raise Exception("Invariant: Unreachable code path")
self.logger.debug2(
"%s failure: %s",
self.mnemonic,
err_message,
)
computation.return_gas(child_msg_gas)
computation.stack_push(0)
else:
if code_address:
code = computation.state.account_db.get_code(code_address)
else:
code = computation.state.account_db.get_code(to)
child_msg_kwargs = {
'gas': child_msg_gas,
'value': value,
'to': to,
'data': call_data,
'code': code,
'code_address': code_address,
'should_transfer_value': should_transfer_value,
'is_static': is_static,
}
if sender is not None:
child_msg_kwargs['sender'] = sender
child_msg = computation.prepare_child_message(**child_msg_kwargs)
child_computation = computation.apply_child_computation(child_msg)
if child_computation.is_error:
computation.stack_push(0)
else:
computation.stack_push(1)
if not child_computation.should_erase_return_data:
actual_output_size = min(memory_output_size,
len(child_computation.output))
computation.memory_write(
memory_output_start_position,
actual_output_size,
child_computation.output[:actual_output_size],
)
if child_computation.should_return_gas:
computation.return_gas(child_computation.get_gas_remaining())