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Add comments to unsafeAccess functions of Arrays library (#3718)

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tincho
2022-09-24 00:23:32 +02:00
committed by GitHub
parent e2362ce74f
commit 561d0eead3
1 changed files with 9 additions and 0 deletions
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9
contracts/utils/Arrays.sol
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@ -56,6 +56,9 @@ library Arrays {
*/ */
function unsafeAccess(address[] storage arr, uint256 pos) internal pure returns (StorageSlot.AddressSlot storage) { function unsafeAccess(address[] storage arr, uint256 pos) internal pure returns (StorageSlot.AddressSlot storage) {
bytes32 slot; bytes32 slot;
// We use assembly to calculate the storage slot of the element at index `pos` of the dynamic array `arr`
// following https://docs.soliditylang.org/en/v0.8.17/internals/layout_in_storage.html#mappings-and-dynamic-arrays.
/// @solidity memory-safe-assembly /// @solidity memory-safe-assembly
assembly { assembly {
mstore(0, arr.slot) mstore(0, arr.slot)
@ -71,6 +74,9 @@ library Arrays {
*/ */
function unsafeAccess(bytes32[] storage arr, uint256 pos) internal pure returns (StorageSlot.Bytes32Slot storage) { function unsafeAccess(bytes32[] storage arr, uint256 pos) internal pure returns (StorageSlot.Bytes32Slot storage) {
bytes32 slot; bytes32 slot;
// We use assembly to calculate the storage slot of the element at index `pos` of the dynamic array `arr`
// following https://docs.soliditylang.org/en/v0.8.17/internals/layout_in_storage.html#mappings-and-dynamic-arrays.
/// @solidity memory-safe-assembly /// @solidity memory-safe-assembly
assembly { assembly {
mstore(0, arr.slot) mstore(0, arr.slot)
@ -86,6 +92,9 @@ library Arrays {
*/ */
function unsafeAccess(uint256[] storage arr, uint256 pos) internal pure returns (StorageSlot.Uint256Slot storage) { function unsafeAccess(uint256[] storage arr, uint256 pos) internal pure returns (StorageSlot.Uint256Slot storage) {
bytes32 slot; bytes32 slot;
// We use assembly to calculate the storage slot of the element at index `pos` of the dynamic array `arr`
// following https://docs.soliditylang.org/en/v0.8.17/internals/layout_in_storage.html#mappings-and-dynamic-arrays.
/// @solidity memory-safe-assembly /// @solidity memory-safe-assembly
assembly { assembly {
mstore(0, arr.slot) mstore(0, arr.slot)