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Diffstat (limited to 'docs/introduction-to-smart-contracts.rst')
| -rw-r--r-- | docs/introduction-to-smart-contracts.rst | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/docs/introduction-to-smart-contracts.rst b/docs/introduction-to-smart-contracts.rst index 922056ec..ad0a9650 100644 --- a/docs/introduction-to-smart-contracts.rst +++ b/docs/introduction-to-smart-contracts.rst @@ -348,10 +348,12 @@ 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 -quadratically). +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 a word (256-bit), when +accessing (either reading or writing) a previously untouched memory word (ie. any offset +within a word). 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 computations are performed on an area called the **stack**. It has a maximum size of |