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Diffstat (limited to 'docs/miscellaneous.rst')
| -rw-r--r-- | docs/miscellaneous.rst | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/docs/miscellaneous.rst b/docs/miscellaneous.rst index 21978ded..017d5b81 100644 --- a/docs/miscellaneous.rst +++ b/docs/miscellaneous.rst @@ -8,13 +8,17 @@ Miscellaneous Layout of State Variables in Storage ************************************ -Statically-sized variables (everything except mapping and dynamically-sized array types) are laid out contiguously in storage starting from position ``0``. Multiple items that need less than 32 bytes are packed into a single storage slot if possible, according to the following rules: +Statically-sized variables (everything except mapping and dynamically-sized array types) are laid out contiguously in storage starting from position ``0``. Multiple, contiguous items that need less than 32 bytes are packed into a single storage slot if possible, according to the following rules: - The first item in a storage slot is stored lower-order aligned. - Elementary types use only that many bytes that are necessary to store them. - If an elementary type does not fit the remaining part of a storage slot, it is moved to the next storage slot. - Structs and array data always start a new slot and occupy whole slots (but items inside a struct or array are packed tightly according to these rules). +For contracts that use inheritance, the ordering of state variables is determined by the +C3-linearized order of contracts starting with the most base-ward contract. If allowed +by the above rules, state variables from different contracts do share the same storage slot. + .. warning:: When using elements that are smaller than 32 bytes, your contract's gas usage may be higher. This is because the EVM operates on 32 bytes at a time. Therefore, if the element is smaller |