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Use Trace208 in Votes to support ERC6372 clocks (#4539)

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Co-authored-by: Francisco <fg@frang.io>
This commit is contained in:
Hadrien Croubois
2023-08-30 19:25:17 +02:00
committed by GitHub
parent 812404cee8
commit cd67894914
9 changed files with 339 additions and 31 deletions
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17
contracts/token/ERC20/extensions/ERC20Votes.sol
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@ -9,7 +9,7 @@ import {Checkpoints} from "../../../utils/structs/Checkpoints.sol";
/**
* @dev Extension of ERC20 to support Compound-like voting and delegation. This version is more generic than Compound's,
* and supports token supply up to 2^224^ - 1, while COMP is limited to 2^96^ - 1.
* and supports token supply up to 2^208^ - 1, while COMP is limited to 2^96^ - 1.
*
* NOTE: This contract does not provide interface compatibility with Compound's COMP token.
*
@ -27,10 +27,17 @@ abstract contract ERC20Votes is ERC20, Votes {
error ERC20ExceededSafeSupply(uint256 increasedSupply, uint256 cap);
/**
* @dev Maximum token supply. Defaults to `type(uint224).max` (2^224^ - 1).
* @dev Maximum token supply. Defaults to `type(uint208).max` (2^208^ - 1).
*
* This maximum is enforced in {_update}. It limits the total supply of the token, which is otherwise a uint256,
* so that checkpoints can be stored in the Trace208 structure used by {{Votes}}. Increasing this value will not
* remove the underlying limitation, and will cause {_update} to fail because of a math overflow in
* {_transferVotingUnits}. An override could be used to further restrict the total supply (to a lower value) if
* additional logic requires it. When resolving override conflicts on this function, the minimum should be
* returned.
*/
function _maxSupply() internal view virtual returns (uint224) {
return type(uint224).max;
function _maxSupply() internal view virtual returns (uint256) {
return type(uint208).max;
}
/**
@ -70,7 +77,7 @@ abstract contract ERC20Votes is ERC20, Votes {
/**
* @dev Get the `pos`-th checkpoint for `account`.
*/
function checkpoints(address account, uint32 pos) public view virtual returns (Checkpoints.Checkpoint224 memory) {
function checkpoints(address account, uint32 pos) public view virtual returns (Checkpoints.Checkpoint208 memory) {
return _checkpoints(account, pos);
}
}