diff options
| -rw-r--r-- | docs/introduction-to-smart-contracts.rst | 8 | ||||
| -rw-r--r-- | docs/miscellaneous.rst | 2 |
2 files changed, 5 insertions, 5 deletions
diff --git a/docs/introduction-to-smart-contracts.rst b/docs/introduction-to-smart-contracts.rst index 922056ec..bfc342d9 100644 --- a/docs/introduction-to-smart-contracts.rst +++ b/docs/introduction-to-smart-contracts.rst @@ -348,9 +348,11 @@ storage. A contract can neither read nor write to any storage apart from its own. The second memory area is called **memory**, of which a contract obtains -a freshly cleared instance for each message call. Memory can be -addressed at byte level, but read and written to in 32 byte (256-bit) -chunks. Memory is more costly the larger it grows (it scales +a freshly cleared instance for each message call. Memory is linear and can be +addressed at byte level, but reads are limited to a width of 256 bits, while writes +can be either 8 bits or 256 bits wide. Memory is expanded by accessing (either +reading or writing) a previously untouched memory offset. At the time of expansion, +the cost in gas must be paid. Memory is more costly the larger it grows (it scales quadratically). The EVM is not a register machine but a stack machine, so all diff --git a/docs/miscellaneous.rst b/docs/miscellaneous.rst index cdc82c78..47da33b8 100644 --- a/docs/miscellaneous.rst +++ b/docs/miscellaneous.rst @@ -60,8 +60,6 @@ The position of ``data[4][9].b`` is at ``keccak256(uint256(9) . keccak256(uint25 Layout in Memory **************** -EVM memory is linear. Reading is limited to 256-bit width, but both 8-bit and 256-bit writes are allowed. Memory size is 0 at the beginning of execution. Memory is expanded by accessing (either reading or writing) a previously untouched memory offset. At the time of expansion, the cost in gas must be paid. - Solidity reserves three 256-bit slots: - 0 - 64: scratch space for hashing methods - 64 - 96: currently allocated memory size (aka. free memory pointer) |