Feature Tip: Add private address tag to any address under My Name Tag !
Overview
Max Total Supply
217,784,269.10084720279330838 st1INCH
Holders
4,565 (0.00%)
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
162.066289678621084967 st1INCHValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
St1inch
Compiler Version
v0.8.17+commit.8df45f5f
Optimization Enabled:
Yes with 1000000 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "@openzeppelin/contracts/utils/math/Math.sol"; import "@openzeppelin/contracts/utils/Address.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; import "@1inch/erc20-pods/contracts/ERC20Pods.sol"; import "@1inch/erc20-pods/contracts/Pod.sol"; import "@1inch/solidity-utils/contracts/libraries/SafeERC20.sol"; import "./helpers/VotingPowerCalculator.sol"; import "./interfaces/IVotable.sol"; /** * @title 1inch staking contract * @notice The contract provides the following features: staking, delegation, farming * How lock period works: * - balances and voting power * - Lock min and max * - Add lock * - earlyWithdrawal * - penalty math */ contract St1inch is ERC20Pods, Ownable, VotingPowerCalculator, IVotable { using SafeERC20 for IERC20; event EmergencyExitSet(bool status); event MaxLossRatioSet(uint256 ratio); event MinLockPeriodRatioSet(uint256 ratio); event FeeReceiverSet(address receiver); event DefaultFarmSet(address defaultFarm); error ApproveDisabled(); error TransferDisabled(); error LockTimeMoreMaxLock(); error LockTimeLessMinLock(); error UnlockTimeHasNotCome(); error StakeUnlocked(); error MinLockPeriodRatioNotReached(); error MinReturnIsNotMet(); error MaxLossIsNotMet(); error MaxLossOverflow(); error LossIsTooBig(); error RescueAmountIsTooLarge(); error ExpBaseTooBig(); error ExpBaseTooSmall(); error DefaultFarmTokenMismatch(); error DepositsDisabled(); error ZeroAddress(); /// @notice The minimum allowed staking period uint256 public constant MIN_LOCK_PERIOD = 30 days; /// @notice The maximum allowed staking period /// @dev WARNING: It is not enough to change the constant only but voting power decrease curve should be revised also uint256 public constant MAX_LOCK_PERIOD = 2 * 365 days; /// @notice Voting power decreased to 1/_VOTING_POWER_DIVIDER after lock expires /// @dev WARNING: It is not enough to change the constant only but voting power decrease curve should be revised also uint256 private constant _VOTING_POWER_DIVIDER = 20; uint256 private constant _PODS_LIMIT = 5; /// @notice Maximum allowed gas spent by each attached pod. If there not enough gas for pod execution then /// transaction is reverted. If pod uses more gas then its execution is reverted silently, not affection the /// main transaction uint256 private constant _POD_CALL_GAS_LIMIT = 500_000; uint256 private constant _ONE = 1e9; IERC20 public immutable oneInch; /// @notice The stucture to store stake information for a staker struct Depositor { uint40 lockTime; // Unix time in seconds uint40 unlockTime; // Unix time in seconds uint176 amount; // Staked 1inch token amount } mapping(address => Depositor) public depositors; uint256 public totalDeposits; bool public emergencyExit; uint256 public maxLossRatio; uint256 public minLockPeriodRatio; address public feeReceiver; address public defaultFarm; /** * @notice Initializes the contract * @param oneInch_ The token to be staked * @param expBase_ The rate for the voting power decrease over time */ constructor(IERC20 oneInch_, uint256 expBase_) ERC20Pods(_PODS_LIMIT, _POD_CALL_GAS_LIMIT) ERC20("Staking 1INCH v2", "st1INCH") VotingPowerCalculator(expBase_, block.timestamp) { // voting power after MAX_LOCK_PERIOD should be equal to staked amount divided by _VOTING_POWER_DIVIDER if (_votingPowerAt(1e18, block.timestamp + MAX_LOCK_PERIOD) * _VOTING_POWER_DIVIDER < 1e18) revert ExpBaseTooBig(); if (_votingPowerAt(1e18, block.timestamp + MAX_LOCK_PERIOD + 1) * _VOTING_POWER_DIVIDER > 1e18) revert ExpBaseTooSmall(); oneInch = oneInch_; } /** * @notice Sets the new contract that would recieve early withdrawal fees * @param feeReceiver_ The receiver contract address */ function setFeeReceiver(address feeReceiver_) external onlyOwner { if (feeReceiver_ == address(0)) revert ZeroAddress(); feeReceiver = feeReceiver_; emit FeeReceiverSet(feeReceiver_); } /** * @notice Sets the new farm that all staking users will automatically join after staking for reward farming * @param defaultFarm_ The farm contract address */ function setDefaultFarm(address defaultFarm_) external onlyOwner { if (defaultFarm_ != address(0) && Pod(defaultFarm_).token() != this) revert DefaultFarmTokenMismatch(); defaultFarm = defaultFarm_; emit DefaultFarmSet(defaultFarm_); } /** * @notice Sets the maximum allowed loss ratio for early withdrawal. If the ratio is not met, actual is more than allowed, * then early withdrawal will revert. * Example: maxLossRatio = 90% and 1000 staked 1inch tokens means that a user can execute early withdrawal only * if his loss is less than or equals 90% of his stake, which is 900 tokens. Thus, if a user loses 900 tokens he is allowed * to do early withdrawal and not if the loss is greater. * @param maxLossRatio_ The maximum loss allowed (9 decimals). */ function setMaxLossRatio(uint256 maxLossRatio_) external onlyOwner { if (maxLossRatio_ > _ONE) revert MaxLossOverflow(); maxLossRatio = maxLossRatio_; emit MaxLossRatioSet(maxLossRatio_); } /** * @notice Sets the minimum allowed lock period ratio for early withdrawal. If the ratio is not met, actual is more than allowed, * then early withdrawal will revert. * @param minLockPeriodRatio_ The maximum loss allowed (9 decimals). */ function setMinLockPeriodRatio(uint256 minLockPeriodRatio_) external onlyOwner { if (minLockPeriodRatio_ > _ONE) revert MaxLossOverflow(); minLockPeriodRatio = minLockPeriodRatio_; emit MinLockPeriodRatioSet(minLockPeriodRatio_); } /** * @notice Sets the emergency exit mode. In emergency mode any stake may withdraw its stake regardless of lock. * The mode is intended to use only for migration to a new version of staking contract. * @param emergencyExit_ set `true` to enter emergency exit mode and `false` to return to normal operations */ function setEmergencyExit(bool emergencyExit_) external onlyOwner { emergencyExit = emergencyExit_; emit EmergencyExitSet(emergencyExit_); } /** * @notice Gets the voting power of the provided account * @param account The address of an account to get voting power for * @return votingPower The voting power available at the block timestamp */ function votingPowerOf(address account) external view returns (uint256) { return _votingPowerAt(balanceOf(account), block.timestamp); } /** * @notice Gets the voting power of the provided account at the given timestamp * @dev To calculate voting power at any timestamp provided the contract stores each balance * as it was staked for the maximum lock time. If a staker locks its stake for less than the maximum * then at the moment of deposit its balance is recorded as it was staked for the maximum but time * equal to `max lock period-lock time` has passed. It makes available voting power calculation * available at any point in time within the maximum lock period. * @param account The address of an account to get voting power for * @param timestamp The timestamp to calculate voting power at * @return votingPower The voting power available at the moment of `timestamp` */ function votingPowerOfAt(address account, uint256 timestamp) external view returns (uint256) { return _votingPowerAt(balanceOf(account), timestamp); } /** * @notice Gets the voting power for the provided balance at the current timestamp assuming that * the balance is a balance at the moment of the maximum lock time * @param balance The balance for the maximum lock time * @return votingPower The voting power available at the block timestamp */ function votingPower(uint256 balance) external view returns (uint256) { return _votingPowerAt(balance, block.timestamp); } /** * @notice Gets the voting power for the provided balance at the current timestamp assuming that * the balance is a balance at the moment of the maximum lock time * @param balance The balance for the maximum lock time * @param timestamp The timestamp to calculate the voting power at * @return votingPower The voting power available at the block timestamp */ function votingPowerAt(uint256 balance, uint256 timestamp) external view returns (uint256) { return _votingPowerAt(balance, timestamp); } /** * @notice Stakes given amount and locks it for the given duration * @param amount The amount of tokens to stake * @param duration The lock period in seconds. If there is a stake locked then the lock period is extended by the duration. * To keep the current lock period unchanged pass 0 for the duration. */ function deposit(uint256 amount, uint256 duration) external { _deposit(msg.sender, amount, duration); } /** * @notice Stakes given amount and locks it for the given duration with permit * @param amount The amount of tokens to stake * @param duration The lock period in seconds. If there is a stake locked then the lock period is extended by the duration. * To keep the current lock period unchanged pass 0 for the duration * @param permit Permit given by the staker */ function depositWithPermit(uint256 amount, uint256 duration, bytes calldata permit) external { oneInch.safePermit(permit); _deposit(msg.sender, amount, duration); } /** * @notice Stakes given amount on behalf of provided account without locking or extending lock * @param account The account to stake for * @param amount The amount to stake */ function depositFor(address account, uint256 amount) external { _deposit(account, amount, 0); } /** * @notice Stakes given amount on behalf of provided account without locking or extending lock with permit * @param account The account to stake for * @param amount The amount to stake * @param permit Permit given by the caller */ function depositForWithPermit(address account, uint256 amount, bytes calldata permit) external { oneInch.safePermit(permit); _deposit(account, amount, 0); } function _deposit(address account, uint256 amount, uint256 duration) private { if (emergencyExit) revert DepositsDisabled(); Depositor memory depositor = depositors[account]; // SLOAD uint256 lockedTill = Math.max(depositor.unlockTime, block.timestamp) + duration; uint256 lockLeft = lockedTill - block.timestamp; if (lockLeft < MIN_LOCK_PERIOD) revert LockTimeLessMinLock(); if (lockLeft > MAX_LOCK_PERIOD) revert LockTimeMoreMaxLock(); uint256 balanceDiff = _balanceAt(depositor.amount + amount, lockedTill) / _VOTING_POWER_DIVIDER - balanceOf(account); depositor.lockTime = uint40(duration == 0 ? depositor.lockTime : block.timestamp); depositor.unlockTime = uint40(lockedTill); depositor.amount += uint176(amount); depositors[account] = depositor; // SSTORE totalDeposits += amount; _mint(account, balanceDiff); if (amount > 0) { oneInch.safeTransferFrom(msg.sender, address(this), amount); } if (defaultFarm != address(0) && !hasPod(account, defaultFarm)) { _addPod(account, defaultFarm); } } /** * @notice Withdraw stake before lock period expires at the cost of losing part of a stake. * The stake loss is proportional to the time passed from the maximum lock period to the lock expiration and voting power. * The more time is passed the less would be the loss. * Formula to calculate return amount = (deposit - voting power)) / 0.95 * @param minReturn The minumum amount of stake acceptable for return. If actual amount is less then the transaction is reverted * @param maxLoss The maximum amount of loss acceptable. If actual loss is bigger then the transaction is reverted */ function earlyWithdraw(uint256 minReturn, uint256 maxLoss) external { earlyWithdrawTo(msg.sender, minReturn, maxLoss); } /** * @notice Withdraw stake before lock period expires at the cost of losing part of a stake to the specified account * The stake loss is proportional to the time passed from the maximum lock period to the lock expiration and voting power. * The more time is passed the less would be the loss. * Formula to calculate return amount = (deposit - voting power)) / 0.95 * @param to The account to withdraw the stake to * @param minReturn The minumum amount of stake acceptable for return. If actual amount is less then the transaction is reverted * @param maxLoss The maximum amount of loss acceptable. If actual loss is bigger then the transaction is reverted */ // ret(balance) = (deposit - vp(balance)) / 0.95 function earlyWithdrawTo(address to, uint256 minReturn, uint256 maxLoss) public { Depositor memory depositor = depositors[msg.sender]; // SLOAD if (emergencyExit || block.timestamp >= depositor.unlockTime) revert StakeUnlocked(); uint256 allowedExitTime = depositor.lockTime + (depositor.unlockTime - depositor.lockTime) * minLockPeriodRatio / _ONE; if (block.timestamp < allowedExitTime) revert MinLockPeriodRatioNotReached(); uint256 amount = depositor.amount; if (amount > 0) { uint256 balance = balanceOf(msg.sender); (uint256 loss, uint256 ret) = _earlyWithdrawLoss(amount, balance); if (ret < minReturn) revert MinReturnIsNotMet(); if (loss > maxLoss) revert MaxLossIsNotMet(); if (loss > amount * maxLossRatio / _ONE) revert LossIsTooBig(); _withdraw(depositor, balance); oneInch.safeTransfer(to, ret); oneInch.safeTransfer(feeReceiver, loss); } } /** * @notice Gets the loss amount if the staker do early withdrawal at the current block * @param account The account to calculate early withdrawal loss for * @return loss The loss amount amount * @return ret The return amount * @return canWithdraw True if the staker can withdraw without penalty, false otherwise */ function earlyWithdrawLoss(address account) external view returns (uint256 loss, uint256 ret, bool canWithdraw) { uint256 amount = depositors[account].amount; (loss, ret) = _earlyWithdrawLoss(amount, balanceOf(account)); canWithdraw = loss <= amount * maxLossRatio / _ONE; } function _earlyWithdrawLoss(uint256 depAmount, uint256 stBalance) private view returns (uint256 loss, uint256 ret) { ret = (depAmount - _votingPowerAt(stBalance, block.timestamp)) * 100 / 95; loss = depAmount - ret; } /** * @notice Withdraws stake if lock period expired */ function withdraw() external { withdrawTo(msg.sender); } /** * @notice Withdraws stake if lock period expired to the given address */ function withdrawTo(address to) public { Depositor memory depositor = depositors[msg.sender]; // SLOAD if (!emergencyExit && block.timestamp < depositor.unlockTime) revert UnlockTimeHasNotCome(); uint256 amount = depositor.amount; if (amount > 0) { _withdraw(depositor, balanceOf(msg.sender)); oneInch.safeTransfer(to, amount); } } function _withdraw(Depositor memory depositor, uint256 balance) private { totalDeposits -= depositor.amount; depositor.amount = 0; // keep unlockTime in storage for next tx optimization depositor.unlockTime = uint40(Math.min(depositor.unlockTime, block.timestamp)); depositors[msg.sender] = depositor; // SSTORE _burn(msg.sender, balance); } /** * @notice Retrieves funds from the contract in emergency situations * @param token The token to retrieve * @param amount The amount of funds to transfer */ function rescueFunds(IERC20 token, uint256 amount) external onlyOwner { if (address(token) == address(0)) { Address.sendValue(payable(msg.sender), amount); } else { if (token == oneInch) { if (amount > oneInch.balanceOf(address(this)) - totalDeposits) revert RescueAmountIsTooLarge(); } token.safeTransfer(msg.sender, amount); } } // ERC20 methods disablers function approve(address, uint256) public pure override(IERC20, ERC20) returns (bool) { revert ApproveDisabled(); } function transfer(address, uint256) public pure override(IERC20, ERC20) returns (bool) { revert TransferDisabled(); } function transferFrom(address, address, uint256) public pure override(IERC20, ERC20) returns (bool) { revert TransferDisabled(); } function increaseAllowance(address, uint256) public pure override returns (bool) { revert ApproveDisabled(); } function decreaseAllowance(address, uint256) public pure override returns (bool) { revert ApproveDisabled(); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "@1inch/solidity-utils/contracts/libraries/AddressSet.sol"; import "./interfaces/IERC20Pods.sol"; import "./interfaces/IPod.sol"; import "./libs/ReentrancyGuard.sol"; abstract contract ERC20Pods is ERC20, IERC20Pods, ReentrancyGuardExt { using AddressSet for AddressSet.Data; using AddressArray for AddressArray.Data; using ReentrancyGuardLib for ReentrancyGuardLib.Data; error PodAlreadyAdded(); error PodNotFound(); error InvalidPodAddress(); error PodsLimitReachedForAccount(); error InsufficientGas(); error ZeroPodsLimit(); uint256 public immutable podsLimit; uint256 public immutable podCallGasLimit; ReentrancyGuardLib.Data private _guard; mapping(address => AddressSet.Data) private _pods; constructor(uint256 podsLimit_, uint256 podCallGasLimit_) { if (podsLimit_ == 0) revert ZeroPodsLimit(); podsLimit = podsLimit_; podCallGasLimit = podCallGasLimit_; _guard.init(); } function hasPod(address account, address pod) public view virtual returns(bool) { return _pods[account].contains(pod); } function podsCount(address account) public view virtual returns(uint256) { return _pods[account].length(); } function podAt(address account, uint256 index) public view virtual returns(address) { return _pods[account].at(index); } function pods(address account) public view virtual returns(address[] memory) { return _pods[account].items.get(); } function balanceOf(address account) public nonReentrantView(_guard) view override(IERC20, ERC20) virtual returns(uint256) { return super.balanceOf(account); } function podBalanceOf(address pod, address account) public nonReentrantView(_guard) view virtual returns(uint256) { if (hasPod(account, pod)) { return super.balanceOf(account); } return 0; } function addPod(address pod) public virtual { _addPod(msg.sender, pod); } function removePod(address pod) public virtual { _removePod(msg.sender, pod); } function removeAllPods() public virtual { _removeAllPods(msg.sender); } function _addPod(address account, address pod) internal virtual { if (pod == address(0)) revert InvalidPodAddress(); if (!_pods[account].add(pod)) revert PodAlreadyAdded(); if (_pods[account].length() > podsLimit) revert PodsLimitReachedForAccount(); emit PodAdded(account, pod); uint256 balance = balanceOf(account); if (balance > 0) { _updateBalances(pod, address(0), account, balance); } } function _removePod(address account, address pod) internal virtual { if (!_pods[account].remove(pod)) revert PodNotFound(); emit PodRemoved(account, pod); uint256 balance = balanceOf(account); if (balance > 0) { _updateBalances(pod, account, address(0), balance); } } function _removeAllPods(address account) internal virtual { address[] memory items = _pods[account].items.get(); uint256 balance = balanceOf(account); unchecked { for (uint256 i = items.length; i > 0; i--) { _pods[account].remove(items[i - 1]); emit PodRemoved(account, items[i - 1]); if (balance > 0) { _updateBalances(items[i - 1], account, address(0), balance); } } } } /// @notice Assembly implementation of the gas limited call to avoid return gas bomb, // moreover call to a destructed pod would also revert even inside try-catch block in Solidity 0.8.17 /// @dev try IPod(pod).updateBalances{gas: _POD_CALL_GAS_LIMIT}(from, to, amount) {} catch {} function _updateBalances(address pod, address from, address to, uint256 amount) private { bytes4 selector = IPod.updateBalances.selector; bytes4 exception = InsufficientGas.selector; uint256 gasLimit = podCallGasLimit; assembly { // solhint-disable-line no-inline-assembly let ptr := mload(0x40) mstore(ptr, selector) mstore(add(ptr, 0x04), from) mstore(add(ptr, 0x24), to) mstore(add(ptr, 0x44), amount) if lt(div(mul(gas(), 63), 64), gasLimit) { mstore(0, exception) revert(0, 4) } pop(call(gasLimit, pod, 0, ptr, 0x64, 0, 0)) } } // ERC20 Overrides function _afterTokenTransfer(address from, address to, uint256 amount) internal nonReentrant(_guard) override virtual { super._afterTokenTransfer(from, to, amount); unchecked { if (amount > 0 && from != to) { address[] memory a = _pods[from].items.get(); address[] memory b = _pods[to].items.get(); uint256 aLength = a.length; uint256 bLength = b.length; for (uint256 i = 0; i < aLength; i++) { address pod = a[i]; uint256 j; for (j = 0; j < bLength; j++) { if (pod == b[j]) { // Both parties are participating of the same Pod _updateBalances(pod, from, to, amount); b[j] = address(0); break; } } if (j == bLength) { // Sender is participating in a Pod, but receiver is not _updateBalances(pod, from, address(0), amount); } } for (uint256 j = 0; j < bLength; j++) { address pod = b[j]; if (pod != address(0)) { // Receiver is participating in a Pod, but sender is not _updateBalances(pod, address(0), to, amount); } } } } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; interface IERC20Pods is IERC20 { event PodAdded(address account, address pod); event PodRemoved(address account, address pod); function hasPod(address account, address pod) external view returns(bool); function podsCount(address account) external view returns(uint256); function podAt(address account, uint256 index) external view returns(address); function pods(address account) external view returns(address[] memory); function podBalanceOf(address pod, address account) external view returns(uint256); function addPod(address pod) external; function removePod(address pod) external; function removeAllPods() external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; interface IPod { function updateBalances(address from, address to, uint256 amount) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; library ReentrancyGuardLib { error ReentrantCall(); uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; struct Data { uint256 _status; } function init(Data storage self) internal { self._status = _NOT_ENTERED; } function enter(Data storage self) internal { if (self._status == _ENTERED) revert ReentrantCall(); self._status = _ENTERED; } function exit(Data storage self) internal { self._status = _NOT_ENTERED; } function check(Data storage self) internal view returns (bool) { return self._status == _ENTERED; } } contract ReentrancyGuardExt { using ReentrancyGuardLib for ReentrancyGuardLib.Data; modifier nonReentrant(ReentrancyGuardLib.Data storage self) { self.enter(); _; self.exit(); } modifier nonReentrantView(ReentrancyGuardLib.Data storage self) { if (self.check()) revert ReentrancyGuardLib.ReentrantCall(); _; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./interfaces/IPod.sol"; import "./interfaces/IERC20Pods.sol"; abstract contract Pod is IPod { error AccessDenied(); IERC20Pods public immutable token; modifier onlyToken { if (msg.sender != address(token)) revert AccessDenied(); _; } constructor(IERC20Pods token_) { token = token_; } function updateBalances(address from, address to, uint256 amount) external onlyToken { _updateBalances(from, to, amount); } function _updateBalances(address from, address to, uint256 amount) internal virtual; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; pragma abicoder v1; interface IDaiLikePermit { function permit( address holder, address spender, uint256 nonce, uint256 expiry, bool allowed, uint8 v, bytes32 r, bytes32 s ) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; pragma abicoder v1; /// @title Library that implements address array on mapping, stores array length at 0 index. library AddressArray { error IndexOutOfBounds(); error PopFromEmptyArray(); error OutputArrayTooSmall(); /// @dev Data struct containing raw mapping. struct Data { mapping(uint256 => uint256) _raw; } /// @dev Length of array. function length(Data storage self) internal view returns (uint256) { return self._raw[0] >> 160; } /// @dev Returns data item from `self` storage at `i`. function at(Data storage self, uint256 i) internal view returns (address) { return address(uint160(self._raw[i])); } /// @dev Returns list of addresses from storage `self`. function get(Data storage self) internal view returns (address[] memory arr) { uint256 lengthAndFirst = self._raw[0]; arr = new address[](lengthAndFirst >> 160); _get(self, arr, lengthAndFirst); } /// @dev Puts list of addresses from `self` storage into `output` array. function get(Data storage self, address[] memory output) internal view returns (address[] memory) { return _get(self, output, self._raw[0]); } function _get( Data storage self, address[] memory output, uint256 lengthAndFirst ) private view returns (address[] memory) { uint256 len = lengthAndFirst >> 160; if (len > output.length) revert OutputArrayTooSmall(); if (len > 0) { output[0] = address(uint160(lengthAndFirst)); unchecked { for (uint256 i = 1; i < len; i++) { output[i] = address(uint160(self._raw[i])); } } } return output; } /// @dev Array push back `account` operation on storage `self`. function push(Data storage self, address account) internal returns (uint256) { unchecked { uint256 lengthAndFirst = self._raw[0]; uint256 len = lengthAndFirst >> 160; if (len == 0) { self._raw[0] = (1 << 160) + uint160(account); } else { self._raw[0] = lengthAndFirst + (1 << 160); self._raw[len] = uint160(account); } return len + 1; } } /// @dev Array pop back operation for storage `self`. function pop(Data storage self) internal { unchecked { uint256 lengthAndFirst = self._raw[0]; uint256 len = lengthAndFirst >> 160; if (len == 0) revert PopFromEmptyArray(); self._raw[len - 1] = 0; if (len > 1) { self._raw[0] = lengthAndFirst - (1 << 160); } } } /// @dev Set element for storage `self` at `index` to `account`. function set( Data storage self, uint256 index, address account ) internal { uint256 len = length(self); if (index >= len) revert IndexOutOfBounds(); if (index == 0) { self._raw[0] = (len << 160) | uint160(account); } else { self._raw[index] = uint160(account); } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; pragma abicoder v1; import "./AddressArray.sol"; /** @title Library that is using AddressArray library for AddressArray.Data * and allows Set operations on address storage data: * 1. add * 2. remove * 3. contains */ library AddressSet { using AddressArray for AddressArray.Data; /** @dev Data struct from AddressArray.Data items * and lookup mapping address => index in data array. */ struct Data { AddressArray.Data items; mapping(address => uint256) lookup; } /// @dev Length of data storage. function length(Data storage s) internal view returns (uint256) { return s.items.length(); } /// @dev Returns data item from `s` storage at `index`. function at(Data storage s, uint256 index) internal view returns (address) { return s.items.at(index); } /// @dev Returns true if storage `s` has `item`. function contains(Data storage s, address item) internal view returns (bool) { return s.lookup[item] != 0; } /// @dev Adds `item` into storage `s` and returns true if successful. function add(Data storage s, address item) internal returns (bool) { if (s.lookup[item] > 0) { return false; } s.lookup[item] = s.items.push(item); return true; } /// @dev Removes `item` from storage `s` and returns true if successful. function remove(Data storage s, address item) internal returns (bool) { uint256 index = s.lookup[item]; if (index == 0) { return false; } if (index < s.items.length()) { unchecked { address lastItem = s.items.at(s.items.length() - 1); s.items.set(index - 1, lastItem); s.lookup[lastItem] = index; } } s.items.pop(); delete s.lookup[item]; return true; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; pragma abicoder v1; /// @title Revert reason forwarder. library RevertReasonForwarder { /// @dev Forwards latest externall call revert. function reRevert() internal pure { // bubble up revert reason from latest external call /// @solidity memory-safe-assembly assembly { // solhint-disable-line no-inline-assembly let ptr := mload(0x40) returndatacopy(ptr, 0, returndatasize()) revert(ptr, returndatasize()) } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; pragma abicoder v1; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol"; import "../interfaces/IDaiLikePermit.sol"; import "../libraries/RevertReasonForwarder.sol"; /// @title Implements efficient safe methods for ERC20 interface. library SafeERC20 { error SafeTransferFailed(); error SafeTransferFromFailed(); error ForceApproveFailed(); error SafeIncreaseAllowanceFailed(); error SafeDecreaseAllowanceFailed(); error SafePermitBadLength(); /// @dev Ensures method do not revert or return boolean `true`, admits call to non-smart-contract. function safeTransferFrom( IERC20 token, address from, address to, uint256 amount ) internal { bytes4 selector = token.transferFrom.selector; bool success; /// @solidity memory-safe-assembly assembly { // solhint-disable-line no-inline-assembly let data := mload(0x40) mstore(data, selector) mstore(add(data, 0x04), from) mstore(add(data, 0x24), to) mstore(add(data, 0x44), amount) success := call(gas(), token, 0, data, 100, 0x0, 0x20) if success { switch returndatasize() case 0 { success := gt(extcodesize(token), 0) } default { success := and(gt(returndatasize(), 31), eq(mload(0), 1)) } } } if (!success) revert SafeTransferFromFailed(); } /// @dev Ensures method do not revert or return boolean `true`, admits call to non-smart-contract. function safeTransfer( IERC20 token, address to, uint256 value ) internal { if (!_makeCall(token, token.transfer.selector, to, value)) { revert SafeTransferFailed(); } } /// @dev If `approve(from, to, amount)` fails, try to `approve(from, to, 0)` before retry. function forceApprove( IERC20 token, address spender, uint256 value ) internal { if (!_makeCall(token, token.approve.selector, spender, value)) { if ( !_makeCall(token, token.approve.selector, spender, 0) || !_makeCall(token, token.approve.selector, spender, value) ) { revert ForceApproveFailed(); } } } /// @dev Allowance increase with safe math check. function safeIncreaseAllowance( IERC20 token, address spender, uint256 value ) internal { uint256 allowance = token.allowance(address(this), spender); if (value > type(uint256).max - allowance) revert SafeIncreaseAllowanceFailed(); forceApprove(token, spender, allowance + value); } /// @dev Allowance decrease with safe math check. function safeDecreaseAllowance( IERC20 token, address spender, uint256 value ) internal { uint256 allowance = token.allowance(address(this), spender); if (value > allowance) revert SafeDecreaseAllowanceFailed(); forceApprove(token, spender, allowance - value); } /// @dev Calls either ERC20 or Dai `permit` for `token`, if unsuccessful forwards revert from external call. function safePermit(IERC20 token, bytes calldata permit) internal { if (!tryPermit(token, permit)) RevertReasonForwarder.reRevert(); } function tryPermit(IERC20 token, bytes calldata permit) internal returns(bool) { if (permit.length == 32 * 7) { return _makeCalldataCall(token, IERC20Permit.permit.selector, permit); } if (permit.length == 32 * 8) { return _makeCalldataCall(token, IDaiLikePermit.permit.selector, permit); } revert SafePermitBadLength(); } function _makeCall( IERC20 token, bytes4 selector, address to, uint256 amount ) private returns (bool success) { /// @solidity memory-safe-assembly assembly { // solhint-disable-line no-inline-assembly let data := mload(0x40) mstore(data, selector) mstore(add(data, 0x04), to) mstore(add(data, 0x24), amount) success := call(gas(), token, 0, data, 0x44, 0x0, 0x20) if success { switch returndatasize() case 0 { success := gt(extcodesize(token), 0) } default { success := and(gt(returndatasize(), 31), eq(mload(0), 1)) } } } } function _makeCalldataCall( IERC20 token, bytes4 selector, bytes calldata args ) private returns (bool success) { /// @solidity memory-safe-assembly assembly { // solhint-disable-line no-inline-assembly let len := add(4, args.length) let data := mload(0x40) mstore(data, selector) calldatacopy(add(data, 0x04), args.offset, args.length) success := call(gas(), token, 0, data, len, 0x0, 0x20) if success { switch returndatasize() case 0 { success := gt(extcodesize(token), 0) } default { success := and(gt(returndatasize(), 31), eq(mload(0), 1)) } } } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _transferOwnership(_msgSender()); } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { _checkOwner(); _; } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if the sender is not the owner. */ function _checkOwner() internal view virtual { require(owner() == _msgSender(), "Ownable: caller is not the owner"); } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _transferOwnership(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol) pragma solidity ^0.8.0; import "./IERC20.sol"; import "./extensions/IERC20Metadata.sol"; import "../../utils/Context.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin Contracts guidelines: functions revert * instead returning `false` on failure. This behavior is nonetheless * conventional and does not conflict with the expectations of ERC20 * applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20, IERC20Metadata { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * The default value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * All two of these values are immutable: they can only be set once during * construction. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5.05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless this function is * overridden; * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `to` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address to, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _transfer(owner, to, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on * `transferFrom`. This is semantically equivalent to an infinite approval. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _approve(owner, spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * NOTE: Does not update the allowance if the current allowance * is the maximum `uint256`. * * Requirements: * * - `from` and `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. * - the caller must have allowance for ``from``'s tokens of at least * `amount`. */ function transferFrom( address from, address to, uint256 amount ) public virtual override returns (bool) { address spender = _msgSender(); _spendAllowance(from, spender, amount); _transfer(from, to, amount); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { address owner = _msgSender(); _approve(owner, spender, allowance(owner, spender) + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { address owner = _msgSender(); uint256 currentAllowance = allowance(owner, spender); require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(owner, spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `from` to `to`. * * This internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. */ function _transfer( address from, address to, uint256 amount ) internal virtual { require(from != address(0), "ERC20: transfer from the zero address"); require(to != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(from, to, amount); uint256 fromBalance = _balances[from]; require(fromBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[from] = fromBalance - amount; // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by // decrementing then incrementing. _balances[to] += amount; } emit Transfer(from, to, amount); _afterTokenTransfer(from, to, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; unchecked { // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above. _balances[account] += amount; } emit Transfer(address(0), account, amount); _afterTokenTransfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; // Overflow not possible: amount <= accountBalance <= totalSupply. _totalSupply -= amount; } emit Transfer(account, address(0), amount); _afterTokenTransfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve( address owner, address spender, uint256 amount ) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Updates `owner` s allowance for `spender` based on spent `amount`. * * Does not update the allowance amount in case of infinite allowance. * Revert if not enough allowance is available. * * Might emit an {Approval} event. */ function _spendAllowance( address owner, address spender, uint256 amount ) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= amount, "ERC20: insufficient allowance"); unchecked { _approve(owner, spender, currentAllowance - amount); } } } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 amount ) internal virtual {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * has been transferred to `to`. * - when `from` is zero, `amount` tokens have been minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens have been burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer( address from, address to, uint256 amount ) internal virtual {} }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. */ interface IERC20Permit { /** * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens, * given ``owner``'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `from` to `to` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 amount ) external returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract. * * _Available since v4.8._ */ function verifyCallResultFromTarget( address target, bool success, bytes memory returndata, string memory errorMessage ) internal view returns (bytes memory) { if (success) { if (returndata.length == 0) { // only check isContract if the call was successful and the return data is empty // otherwise we already know that it was a contract require(isContract(target), "Address: call to non-contract"); } return returndata; } else { _revert(returndata, errorMessage); } } /** * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason or using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { _revert(returndata, errorMessage); } } function _revert(bytes memory returndata, string memory errorMessage) private pure { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly /// @solidity memory-safe-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol) pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { enum Rounding { Down, // Toward negative infinity Up, // Toward infinity Zero // Toward zero } /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a > b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds up instead * of rounding down. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b - 1) / b can overflow on addition, so we distribute. return a == 0 ? 0 : (a - 1) / b + 1; } /** * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0 * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) * with further edits by Uniswap Labs also under MIT license. */ function mulDiv( uint256 x, uint256 y, uint256 denominator ) internal pure returns (uint256 result) { unchecked { // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256 // variables such that product = prod1 * 2^256 + prod0. uint256 prod0; // Least significant 256 bits of the product uint256 prod1; // Most significant 256 bits of the product assembly { let mm := mulmod(x, y, not(0)) prod0 := mul(x, y) prod1 := sub(sub(mm, prod0), lt(mm, prod0)) } // Handle non-overflow cases, 256 by 256 division. if (prod1 == 0) { return prod0 / denominator; } // Make sure the result is less than 2^256. Also prevents denominator == 0. require(denominator > prod1); /////////////////////////////////////////////// // 512 by 256 division. /////////////////////////////////////////////// // Make division exact by subtracting the remainder from [prod1 prod0]. uint256 remainder; assembly { // Compute remainder using mulmod. remainder := mulmod(x, y, denominator) // Subtract 256 bit number from 512 bit number. prod1 := sub(prod1, gt(remainder, prod0)) prod0 := sub(prod0, remainder) } // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1. // See https://cs.stackexchange.com/q/138556/92363. // Does not overflow because the denominator cannot be zero at this stage in the function. uint256 twos = denominator & (~denominator + 1); assembly { // Divide denominator by twos. denominator := div(denominator, twos) // Divide [prod1 prod0] by twos. prod0 := div(prod0, twos) // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one. twos := add(div(sub(0, twos), twos), 1) } // Shift in bits from prod1 into prod0. prod0 |= prod1 * twos; // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for // four bits. That is, denominator * inv = 1 mod 2^4. uint256 inverse = (3 * denominator) ^ 2; // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works // in modular arithmetic, doubling the correct bits in each step. inverse *= 2 - denominator * inverse; // inverse mod 2^8 inverse *= 2 - denominator * inverse; // inverse mod 2^16 inverse *= 2 - denominator * inverse; // inverse mod 2^32 inverse *= 2 - denominator * inverse; // inverse mod 2^64 inverse *= 2 - denominator * inverse; // inverse mod 2^128 inverse *= 2 - denominator * inverse; // inverse mod 2^256 // Because the division is now exact we can divide by multiplying with the modular inverse of denominator. // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1 // is no longer required. result = prod0 * inverse; return result; } } /** * @notice Calculates x * y / denominator with full precision, following the selected rounding direction. */ function mulDiv( uint256 x, uint256 y, uint256 denominator, Rounding rounding ) internal pure returns (uint256) { uint256 result = mulDiv(x, y, denominator); if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) { result += 1; } return result; } /** * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down. * * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11). */ function sqrt(uint256 a) internal pure returns (uint256) { if (a == 0) { return 0; } // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target. // // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`. // // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)` // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))` // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)` // // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit. uint256 result = 1 << (log2(a) >> 1); // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128, // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision // into the expected uint128 result. unchecked { result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; return min(result, a / result); } } /** * @notice Calculates sqrt(a), following the selected rounding direction. */ function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = sqrt(a); return result + (rounding == Rounding.Up && result * result < a ? 1 : 0); } } /** * @dev Return the log in base 2, rounded down, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 128; } if (value >> 64 > 0) { value >>= 64; result += 64; } if (value >> 32 > 0) { value >>= 32; result += 32; } if (value >> 16 > 0) { value >>= 16; result += 16; } if (value >> 8 > 0) { value >>= 8; result += 8; } if (value >> 4 > 0) { value >>= 4; result += 4; } if (value >> 2 > 0) { value >>= 2; result += 2; } if (value >> 1 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 2, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log2(value); return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0); } } /** * @dev Return the log in base 10, rounded down, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >= 10**64) { value /= 10**64; result += 64; } if (value >= 10**32) { value /= 10**32; result += 32; } if (value >= 10**16) { value /= 10**16; result += 16; } if (value >= 10**8) { value /= 10**8; result += 8; } if (value >= 10**4) { value /= 10**4; result += 4; } if (value >= 10**2) { value /= 10**2; result += 2; } if (value >= 10**1) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log10(value); return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0); } } /** * @dev Return the log in base 256, rounded down, of a positive value. * Returns 0 if given 0. * * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string. */ function log256(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 16; } if (value >> 64 > 0) { value >>= 64; result += 8; } if (value >> 32 > 0) { value >>= 32; result += 4; } if (value >> 16 > 0) { value >>= 16; result += 2; } if (value >> 8 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log256(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log256(value); return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0); } } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; contract VotingPowerCalculator { error OriginInTheFuture(); uint256 private constant _ONE = 1e18; uint256 public immutable origin; uint256 public immutable expBase; uint256 private immutable _expTable0; uint256 private immutable _expTable1; uint256 private immutable _expTable2; uint256 private immutable _expTable3; uint256 private immutable _expTable4; uint256 private immutable _expTable5; uint256 private immutable _expTable6; uint256 private immutable _expTable7; uint256 private immutable _expTable8; uint256 private immutable _expTable9; uint256 private immutable _expTable10; uint256 private immutable _expTable11; uint256 private immutable _expTable12; uint256 private immutable _expTable13; uint256 private immutable _expTable14; uint256 private immutable _expTable15; uint256 private immutable _expTable16; uint256 private immutable _expTable17; uint256 private immutable _expTable18; uint256 private immutable _expTable19; uint256 private immutable _expTable20; uint256 private immutable _expTable21; uint256 private immutable _expTable22; uint256 private immutable _expTable23; uint256 private immutable _expTable24; uint256 private immutable _expTable25; uint256 private immutable _expTable26; uint256 private immutable _expTable27; uint256 private immutable _expTable28; uint256 private immutable _expTable29; constructor(uint256 expBase_, uint256 origin_) { if (origin_ > block.timestamp) revert OriginInTheFuture(); origin = origin_; expBase = expBase_; _expTable0 = expBase_; _expTable1 = (_expTable0 * _expTable0) / _ONE; _expTable2 = (_expTable1 * _expTable1) / _ONE; _expTable3 = (_expTable2 * _expTable2) / _ONE; _expTable4 = (_expTable3 * _expTable3) / _ONE; _expTable5 = (_expTable4 * _expTable4) / _ONE; _expTable6 = (_expTable5 * _expTable5) / _ONE; _expTable7 = (_expTable6 * _expTable6) / _ONE; _expTable8 = (_expTable7 * _expTable7) / _ONE; _expTable9 = (_expTable8 * _expTable8) / _ONE; _expTable10 = (_expTable9 * _expTable9) / _ONE; _expTable11 = (_expTable10 * _expTable10) / _ONE; _expTable12 = (_expTable11 * _expTable11) / _ONE; _expTable13 = (_expTable12 * _expTable12) / _ONE; _expTable14 = (_expTable13 * _expTable13) / _ONE; _expTable15 = (_expTable14 * _expTable14) / _ONE; _expTable16 = (_expTable15 * _expTable15) / _ONE; _expTable17 = (_expTable16 * _expTable16) / _ONE; _expTable18 = (_expTable17 * _expTable17) / _ONE; _expTable19 = (_expTable18 * _expTable18) / _ONE; _expTable20 = (_expTable19 * _expTable19) / _ONE; _expTable21 = (_expTable20 * _expTable20) / _ONE; _expTable22 = (_expTable21 * _expTable21) / _ONE; _expTable23 = (_expTable22 * _expTable22) / _ONE; _expTable24 = (_expTable23 * _expTable23) / _ONE; _expTable25 = (_expTable24 * _expTable24) / _ONE; _expTable26 = (_expTable25 * _expTable25) / _ONE; _expTable27 = (_expTable26 * _expTable26) / _ONE; _expTable28 = (_expTable27 * _expTable27) / _ONE; _expTable29 = (_expTable28 * _expTable28) / _ONE; } function _votingPowerAt(uint256 balance, uint256 timestamp) internal view returns (uint256 votingPower) { timestamp = timestamp < origin ? origin : timestamp; // logic in timestamps before origin is undefined unchecked { uint256 t = timestamp - origin; votingPower = balance; if (t & 0x01 != 0) { votingPower = (votingPower * _expTable0) / _ONE; } if (t & 0x02 != 0) { votingPower = (votingPower * _expTable1) / _ONE; } if (t & 0x04 != 0) { votingPower = (votingPower * _expTable2) / _ONE; } if (t & 0x08 != 0) { votingPower = (votingPower * _expTable3) / _ONE; } if (t & 0x10 != 0) { votingPower = (votingPower * _expTable4) / _ONE; } if (t & 0x20 != 0) { votingPower = (votingPower * _expTable5) / _ONE; } if (t & 0x40 != 0) { votingPower = (votingPower * _expTable6) / _ONE; } if (t & 0x80 != 0) { votingPower = (votingPower * _expTable7) / _ONE; } if (t & 0x100 != 0) { votingPower = (votingPower * _expTable8) / _ONE; } if (t & 0x200 != 0) { votingPower = (votingPower * _expTable9) / _ONE; } if (t & 0x400 != 0) { votingPower = (votingPower * _expTable10) / _ONE; } if (t & 0x800 != 0) { votingPower = (votingPower * _expTable11) / _ONE; } if (t & 0x1000 != 0) { votingPower = (votingPower * _expTable12) / _ONE; } if (t & 0x2000 != 0) { votingPower = (votingPower * _expTable13) / _ONE; } if (t & 0x4000 != 0) { votingPower = (votingPower * _expTable14) / _ONE; } if (t & 0x8000 != 0) { votingPower = (votingPower * _expTable15) / _ONE; } if (t & 0x10000 != 0) { votingPower = (votingPower * _expTable16) / _ONE; } if (t & 0x20000 != 0) { votingPower = (votingPower * _expTable17) / _ONE; } if (t & 0x40000 != 0) { votingPower = (votingPower * _expTable18) / _ONE; } if (t & 0x80000 != 0) { votingPower = (votingPower * _expTable19) / _ONE; } if (t & 0x100000 != 0) { votingPower = (votingPower * _expTable20) / _ONE; } if (t & 0x200000 != 0) { votingPower = (votingPower * _expTable21) / _ONE; } if (t & 0x400000 != 0) { votingPower = (votingPower * _expTable22) / _ONE; } if (t & 0x800000 != 0) { votingPower = (votingPower * _expTable23) / _ONE; } if (t & 0x1000000 != 0) { votingPower = (votingPower * _expTable24) / _ONE; } if (t & 0x2000000 != 0) { votingPower = (votingPower * _expTable25) / _ONE; } if (t & 0x4000000 != 0) { votingPower = (votingPower * _expTable26) / _ONE; } if (t & 0x8000000 != 0) { votingPower = (votingPower * _expTable27) / _ONE; } if (t & 0x10000000 != 0) { votingPower = (votingPower * _expTable28) / _ONE; } if (t & 0x20000000 != 0) { votingPower = (votingPower * _expTable29) / _ONE; } } return votingPower; } function _balanceAt(uint256 votingPower, uint256 timestamp) internal view returns (uint256 balance) { timestamp = timestamp < origin ? origin : timestamp; // logic in timestamps before origin is undefined unchecked { uint256 t = timestamp - origin; balance = votingPower; if (t & 0x01 != 0) { balance = (balance * _ONE) / _expTable0; } if (t & 0x02 != 0) { balance = (balance * _ONE) / _expTable1; } if (t & 0x04 != 0) { balance = (balance * _ONE) / _expTable2; } if (t & 0x08 != 0) { balance = (balance * _ONE) / _expTable3; } if (t & 0x10 != 0) { balance = (balance * _ONE) / _expTable4; } if (t & 0x20 != 0) { balance = (balance * _ONE) / _expTable5; } if (t & 0x40 != 0) { balance = (balance * _ONE) / _expTable6; } if (t & 0x80 != 0) { balance = (balance * _ONE) / _expTable7; } if (t & 0x100 != 0) { balance = (balance * _ONE) / _expTable8; } if (t & 0x200 != 0) { balance = (balance * _ONE) / _expTable9; } if (t & 0x400 != 0) { balance = (balance * _ONE) / _expTable10; } if (t & 0x800 != 0) { balance = (balance * _ONE) / _expTable11; } if (t & 0x1000 != 0) { balance = (balance * _ONE) / _expTable12; } if (t & 0x2000 != 0) { balance = (balance * _ONE) / _expTable13; } if (t & 0x4000 != 0) { balance = (balance * _ONE) / _expTable14; } if (t & 0x8000 != 0) { balance = (balance * _ONE) / _expTable15; } if (t & 0x10000 != 0) { balance = (balance * _ONE) / _expTable16; } if (t & 0x20000 != 0) { balance = (balance * _ONE) / _expTable17; } if (t & 0x40000 != 0) { balance = (balance * _ONE) / _expTable18; } if (t & 0x80000 != 0) { balance = (balance * _ONE) / _expTable19; } if (t & 0x100000 != 0) { balance = (balance * _ONE) / _expTable20; } if (t & 0x200000 != 0) { balance = (balance * _ONE) / _expTable21; } if (t & 0x400000 != 0) { balance = (balance * _ONE) / _expTable22; } if (t & 0x800000 != 0) { balance = (balance * _ONE) / _expTable23; } if (t & 0x1000000 != 0) { balance = (balance * _ONE) / _expTable24; } if (t & 0x2000000 != 0) { balance = (balance * _ONE) / _expTable25; } if (t & 0x4000000 != 0) { balance = (balance * _ONE) / _expTable26; } if (t & 0x8000000 != 0) { balance = (balance * _ONE) / _expTable27; } if (t & 0x10000000 != 0) { balance = (balance * _ONE) / _expTable28; } if (t & 0x20000000 != 0) { balance = (balance * _ONE) / _expTable29; } } return balance; } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.17; pragma abicoder v1; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; interface IVotable is IERC20 { /// @dev we assume that voting power is a function of balance that preserves order function votingPowerOf(address account) external view returns (uint256); }
{ "optimizer": { "enabled": true, "runs": 1000000 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "metadata": { "useLiteralContent": true }, "libraries": {} }
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- No Contract Security Audit Submitted- Submit Audit Here
[{"inputs":[{"internalType":"contract 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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000111111111117dc0aa78b770fa6a738034120c3020000000000000000000000000000000000000000000000000de0b6a89858f3e9
-----Decoded View---------------
Arg [0] : oneInch_ (address): 0x111111111117dC0aa78b770fA6A738034120C302
Arg [1] : expBase_ (uint256): 999999952502977513
-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000111111111117dc0aa78b770fa6a738034120c302
Arg [1] : 0000000000000000000000000000000000000000000000000de0b6a89858f3e9
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