.. py:module:: ethereum.frontier.vm.memory

Ethereum Virtual Machine (EVM) Memory
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

.. contents:: Table of Contents
    :backlinks: none
    :local:

Introduction
------------

EVM memory operations.


.. only:: stage1

Module Contents
---------------


Functions
~~~~~~~~~

.. autoapisummary::
   :nosignatures:

   ethereum.frontier.vm.memory.memory_write
   ethereum.frontier.vm.memory.memory_read_bytes
   ethereum.frontier.vm.memory.buffer_read



Module Details
---------------

memory_write
~~~~~~~~~~~~


.. function:: memory_write(memory: bytearray, start_position: ethereum.base_types.U256, value: ethereum.base_types.Bytes) -> None
   :noindexentry:

   Writes to memory.

   :param memory: Memory contents of the EVM.
   :param start_position: Starting pointer to the memory.
   :param value: Data to write to memory.




.. undocinclude:: /../src/ethereum/frontier/vm/memory.py
   :language: python
   :pyobject: memory_write

memory_read_bytes
~~~~~~~~~~~~~~~~~


.. function:: memory_read_bytes(memory: bytearray, start_position: ethereum.base_types.U256, size: ethereum.base_types.U256) -> bytearray
   :noindexentry:

   Read bytes from memory.

   :param memory: Memory contents of the EVM.
   :param start_position: Starting pointer to the memory.
   :param size: Size of the data that needs to be read from `start_position`.

   :returns: Data read from memory.
   :rtype: data_bytes




.. undocinclude:: /../src/ethereum/frontier/vm/memory.py
   :language: python
   :pyobject: memory_read_bytes

buffer_read
~~~~~~~~~~~


.. function:: buffer_read(buffer: ethereum.base_types.Bytes, start_position: ethereum.base_types.U256, size: ethereum.base_types.U256) -> ethereum.base_types.Bytes
   :noindexentry:

   Read bytes from a buffer. Padding with zeros if neccesary.

   :param buffer: Memory contents of the EVM.
   :param start_position: Starting pointer to the memory.
   :param size: Size of the data that needs to be read from `start_position`.

   :returns: Data read from memory.
   :rtype: data_bytes




.. undocinclude:: /../src/ethereum/frontier/vm/memory.py
   :language: python
   :pyobject: buffer_read