Contract 0x45b2c4139d96f44667577c0d7f7a7d170b420324

/**
 *Submitted for verification at snowtrace.io on 2021-12-04
*/

// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.5.16;

contract JoetrollerErrorReporter {
    enum Error {
        NO_ERROR,
        UNAUTHORIZED,
        JOETROLLER_MISMATCH,
        INSUFFICIENT_SHORTFALL,
        INSUFFICIENT_LIQUIDITY,
        INVALID_CLOSE_FACTOR,
        INVALID_COLLATERAL_FACTOR,
        INVALID_LIQUIDATION_INCENTIVE,
        MARKET_NOT_ENTERED, // no longer possible
        MARKET_NOT_LISTED,
        MARKET_ALREADY_LISTED,
        MATH_ERROR,
        NONZERO_BORROW_BALANCE,
        PRICE_ERROR,
        REJECTION,
        SNAPSHOT_ERROR,
        TOO_MANY_ASSETS,
        TOO_MUCH_REPAY
    }

    enum FailureInfo {
        ACCEPT_ADMIN_PENDING_ADMIN_CHECK,
        ACCEPT_PENDING_IMPLEMENTATION_ADDRESS_CHECK,
        EXIT_MARKET_BALANCE_OWED,
        EXIT_MARKET_REJECTION,
        SET_CLOSE_FACTOR_OWNER_CHECK,
        SET_CLOSE_FACTOR_VALIDATION,
        SET_COLLATERAL_FACTOR_OWNER_CHECK,
        SET_COLLATERAL_FACTOR_NO_EXISTS,
        SET_COLLATERAL_FACTOR_VALIDATION,
        SET_COLLATERAL_FACTOR_WITHOUT_PRICE,
        SET_IMPLEMENTATION_OWNER_CHECK,
        SET_LIQUIDATION_INCENTIVE_OWNER_CHECK,
        SET_LIQUIDATION_INCENTIVE_VALIDATION,
        SET_MAX_ASSETS_OWNER_CHECK,
        SET_PENDING_ADMIN_OWNER_CHECK,
        SET_PENDING_IMPLEMENTATION_OWNER_CHECK,
        SET_PRICE_ORACLE_OWNER_CHECK,
        SUPPORT_MARKET_EXISTS,
        SUPPORT_MARKET_OWNER_CHECK,
        SET_PAUSE_GUARDIAN_OWNER_CHECK
    }

    /**
     * @dev `error` corresponds to enum Error; `info` corresponds to enum FailureInfo, and `detail` is an arbitrary
     * contract-specific code that enables us to report opaque error codes from upgradeable contracts.
     **/
    event Failure(uint256 error, uint256 info, uint256 detail);

    /**
     * @dev use this when reporting a known error from the money market or a non-upgradeable collaborator
     */
    function fail(Error err, FailureInfo info) internal returns (uint256) {
        emit Failure(uint256(err), uint256(info), 0);

        return uint256(err);
    }

    /**
     * @dev use this when reporting an opaque error from an upgradeable collaborator contract
     */
    function failOpaque(
        Error err,
        FailureInfo info,
        uint256 opaqueError
    ) internal returns (uint256) {
        emit Failure(uint256(err), uint256(info), opaqueError);

        return uint256(err);
    }
}

contract TokenErrorReporter {
    enum Error {
        NO_ERROR,
        UNAUTHORIZED,
        BAD_INPUT,
        JOETROLLER_REJECTION,
        JOETROLLER_CALCULATION_ERROR,
        INTEREST_RATE_MODEL_ERROR,
        INVALID_ACCOUNT_PAIR,
        INVALID_CLOSE_AMOUNT_REQUESTED,
        INVALID_COLLATERAL_FACTOR,
        MATH_ERROR,
        MARKET_NOT_FRESH,
        MARKET_NOT_LISTED,
        TOKEN_INSUFFICIENT_ALLOWANCE,
        TOKEN_INSUFFICIENT_BALANCE,
        TOKEN_INSUFFICIENT_CASH,
        TOKEN_TRANSFER_IN_FAILED,
        TOKEN_TRANSFER_OUT_FAILED
    }

    /*
     * Note: FailureInfo (but not Error) is kept in alphabetical order
     *       This is because FailureInfo grows significantly faster, and
     *       the order of Error has some meaning, while the order of FailureInfo
     *       is entirely arbitrary.
     */
    enum FailureInfo {
        ACCEPT_ADMIN_PENDING_ADMIN_CHECK,
        ACCRUE_INTEREST_BORROW_RATE_CALCULATION_FAILED,
        BORROW_ACCRUE_INTEREST_FAILED,
        BORROW_CASH_NOT_AVAILABLE,
        BORROW_FRESHNESS_CHECK,
        BORROW_MARKET_NOT_LISTED,
        BORROW_JOETROLLER_REJECTION,
        LIQUIDATE_ACCRUE_BORROW_INTEREST_FAILED,
        LIQUIDATE_ACCRUE_COLLATERAL_INTEREST_FAILED,
        LIQUIDATE_COLLATERAL_FRESHNESS_CHECK,
        LIQUIDATE_JOETROLLER_REJECTION,
        LIQUIDATE_JOETROLLER_CALCULATE_AMOUNT_SEIZE_FAILED,
        LIQUIDATE_CLOSE_AMOUNT_IS_UINT_MAX,
        LIQUIDATE_CLOSE_AMOUNT_IS_ZERO,
        LIQUIDATE_FRESHNESS_CHECK,
        LIQUIDATE_LIQUIDATOR_IS_BORROWER,
        LIQUIDATE_REPAY_BORROW_FRESH_FAILED,
        LIQUIDATE_SEIZE_JOETROLLER_REJECTION,
        LIQUIDATE_SEIZE_LIQUIDATOR_IS_BORROWER,
        LIQUIDATE_SEIZE_TOO_MUCH,
        MINT_ACCRUE_INTEREST_FAILED,
        MINT_JOETROLLER_REJECTION,
        MINT_FRESHNESS_CHECK,
        MINT_TRANSFER_IN_FAILED,
        MINT_TRANSFER_IN_NOT_POSSIBLE,
        REDEEM_ACCRUE_INTEREST_FAILED,
        REDEEM_JOETROLLER_REJECTION,
        REDEEM_FRESHNESS_CHECK,
        REDEEM_TRANSFER_OUT_NOT_POSSIBLE,
        REDUCE_RESERVES_ACCRUE_INTEREST_FAILED,
        REDUCE_RESERVES_ADMIN_CHECK,
        REDUCE_RESERVES_CASH_NOT_AVAILABLE,
        REDUCE_RESERVES_FRESH_CHECK,
        REDUCE_RESERVES_VALIDATION,
        REPAY_BEHALF_ACCRUE_INTEREST_FAILED,
        REPAY_BORROW_ACCRUE_INTEREST_FAILED,
        REPAY_BORROW_JOETROLLER_REJECTION,
        REPAY_BORROW_FRESHNESS_CHECK,
        REPAY_BORROW_TRANSFER_IN_NOT_POSSIBLE,
        SET_COLLATERAL_FACTOR_OWNER_CHECK,
        SET_COLLATERAL_FACTOR_VALIDATION,
        SET_JOETROLLER_OWNER_CHECK,
        SET_INTEREST_RATE_MODEL_ACCRUE_INTEREST_FAILED,
        SET_INTEREST_RATE_MODEL_FRESH_CHECK,
        SET_INTEREST_RATE_MODEL_OWNER_CHECK,
        SET_MAX_ASSETS_OWNER_CHECK,
        SET_ORACLE_MARKET_NOT_LISTED,
        SET_PENDING_ADMIN_OWNER_CHECK,
        SET_RESERVE_FACTOR_ACCRUE_INTEREST_FAILED,
        SET_RESERVE_FACTOR_ADMIN_CHECK,
        SET_RESERVE_FACTOR_FRESH_CHECK,
        SET_RESERVE_FACTOR_BOUNDS_CHECK,
        TRANSFER_JOETROLLER_REJECTION,
        TRANSFER_NOT_ALLOWED,
        ADD_RESERVES_ACCRUE_INTEREST_FAILED,
        ADD_RESERVES_FRESH_CHECK,
        ADD_RESERVES_TRANSFER_IN_NOT_POSSIBLE,
        SET_PROTOCOL_SEIZE_SHARE_ACCRUE_INTEREST_FAILED,
        SET_PROTOCOL_SEIZE_SHARE_ADMIN_CHECK,
        SET_PROTOCOL_SEIZE_SHARE_FRESH_CHECK,
        SET_PROTOCOL_SEIZE_SHARE_BOUNDS_CHECK
    }

    /**
     * @dev `error` corresponds to enum Error; `info` corresponds to enum FailureInfo, and `detail` is an arbitrary
     * contract-specific code that enables us to report opaque error codes from upgradeable contracts.
     **/
    event Failure(uint256 error, uint256 info, uint256 detail);

    /**
     * @dev use this when reporting a known error from the money market or a non-upgradeable collaborator
     */
    function fail(Error err, FailureInfo info) internal returns (uint256) {
        emit Failure(uint256(err), uint256(info), 0);

        return uint256(err);
    }

    /**
     * @dev use this when reporting an opaque error from an upgradeable collaborator contract
     */
    function failOpaque(
        Error err,
        FailureInfo info,
        uint256 opaqueError
    ) internal returns (uint256) {
        emit Failure(uint256(err), uint256(info), opaqueError);

        return uint256(err);
    }
}




/**
 * @title ERC 20 Token Standard Interface
 *  https://eips.ethereum.org/EIPS/eip-20
 */
interface EIP20Interface {
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);

    /**
     * @notice Get the total number of tokens in circulation
     * @return The supply of tokens
     */
    function totalSupply() external view returns (uint256);

    /**
     * @notice Gets the balance of the specified address
     * @param owner The address from which the balance will be retrieved
     * @return The balance
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @notice Transfer `amount` tokens from `msg.sender` to `dst`
     * @param dst The address of the destination account
     * @param amount The number of tokens to transfer
     * @return Whether or not the transfer succeeded
     */
    function transfer(address dst, uint256 amount) external returns (bool success);

    /**
     * @notice Transfer `amount` tokens from `src` to `dst`
     * @param src The address of the source account
     * @param dst The address of the destination account
     * @param amount The number of tokens to transfer
     * @return Whether or not the transfer succeeded
     */
    function transferFrom(
        address src,
        address dst,
        uint256 amount
    ) external returns (bool success);

    /**
     * @notice Approve `spender` to transfer up to `amount` from `src`
     * @dev This will overwrite the approval amount for `spender`
     *  and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
     * @param spender The address of the account which may transfer tokens
     * @param amount The number of tokens that are approved (-1 means infinite)
     * @return Whether or not the approval succeeded
     */
    function approve(address spender, uint256 amount) external returns (bool success);

    /**
     * @notice Get the current allowance from `owner` for `spender`
     * @param owner The address of the account which owns the tokens to be spent
     * @param spender The address of the account which may transfer tokens
     * @return The number of tokens allowed to be spent (-1 means infinite)
     */
    function allowance(address owner, address spender) external view returns (uint256 remaining);

    event Transfer(address indexed from, address indexed to, uint256 amount);
    event Approval(address indexed owner, address indexed spender, uint256 amount);
}




/**
 * @title Compound's InterestRateModel Interface
 * @author Compound
 */
contract InterestRateModel {
    /// @notice Indicator that this is an InterestRateModel contract (for inspection)
    bool public constant isInterestRateModel = true;

    /**
     * @notice Calculates the current borrow interest rate per sec
     * @param cash The total amount of cash the market has
     * @param borrows The total amount of borrows the market has outstanding
     * @param reserves The total amnount of reserves the market has
     * @return The borrow rate per sec (as a percentage, and scaled by 1e18)
     */
    function getBorrowRate(
        uint256 cash,
        uint256 borrows,
        uint256 reserves
    ) external view returns (uint256);

    /**
     * @notice Calculates the current supply interest rate per sec
     * @param cash The total amount of cash the market has
     * @param borrows The total amount of borrows the market has outstanding
     * @param reserves The total amnount of reserves the market has
     * @param reserveFactorMantissa The current reserve factor the market has
     * @return The supply rate per sec (as a percentage, and scaled by 1e18)
     */
    function getSupplyRate(
        uint256 cash,
        uint256 borrows,
        uint256 reserves,
        uint256 reserveFactorMantissa
    ) external view returns (uint256);
}




interface ERC3156FlashBorrowerInterface {
    /**
     * @dev Receive a flash loan.
     * @param initiator The initiator of the loan.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @param fee The additional amount of tokens to repay.
     * @param data Arbitrary data structure, intended to contain user-defined parameters.
     * @return The keccak256 hash of "ERC3156FlashBorrower.onFlashLoan"
     */
    function onFlashLoan(
        address initiator,
        address token,
        uint256 amount,
        uint256 fee,
        bytes calldata data
    ) external returns (bytes32);
}






contract PriceOracle {
    /**
     * @notice Get the underlying price of a jToken asset
     * @param jToken The jToken to get the underlying price of
     * @return The underlying asset price mantissa (scaled by 1e18).
     *  Zero means the price is unavailable.
     */
    function getUnderlyingPrice(JToken jToken) external view returns (uint256);
}








/**
 * @title Careful Math
 * @author Compound
 * @notice Derived from OpenZeppelin's SafeMath library
 *         https://github.com/OpenZeppelin/openzeppelin-solidity/blob/master/contracts/math/SafeMath.sol
 */
contract CarefulMath {
    /**
     * @dev Possible error codes that we can return
     */
    enum MathError {
        NO_ERROR,
        DIVISION_BY_ZERO,
        INTEGER_OVERFLOW,
        INTEGER_UNDERFLOW
    }

    /**
     * @dev Multiplies two numbers, returns an error on overflow.
     */
    function mulUInt(uint256 a, uint256 b) internal pure returns (MathError, uint256) {
        if (a == 0) {
            return (MathError.NO_ERROR, 0);
        }

        uint256 c = a * b;

        if (c / a != b) {
            return (MathError.INTEGER_OVERFLOW, 0);
        } else {
            return (MathError.NO_ERROR, c);
        }
    }

    /**
     * @dev Integer division of two numbers, truncating the quotient.
     */
    function divUInt(uint256 a, uint256 b) internal pure returns (MathError, uint256) {
        if (b == 0) {
            return (MathError.DIVISION_BY_ZERO, 0);
        }

        return (MathError.NO_ERROR, a / b);
    }

    /**
     * @dev Subtracts two numbers, returns an error on overflow (i.e. if subtrahend is greater than minuend).
     */
    function subUInt(uint256 a, uint256 b) internal pure returns (MathError, uint256) {
        if (b <= a) {
            return (MathError.NO_ERROR, a - b);
        } else {
            return (MathError.INTEGER_UNDERFLOW, 0);
        }
    }

    /**
     * @dev Adds two numbers, returns an error on overflow.
     */
    function addUInt(uint256 a, uint256 b) internal pure returns (MathError, uint256) {
        uint256 c = a + b;

        if (c >= a) {
            return (MathError.NO_ERROR, c);
        } else {
            return (MathError.INTEGER_OVERFLOW, 0);
        }
    }

    /**
     * @dev add a and b and then subtract c
     */
    function addThenSubUInt(
        uint256 a,
        uint256 b,
        uint256 c
    ) internal pure returns (MathError, uint256) {
        (MathError err0, uint256 sum) = addUInt(a, b);

        if (err0 != MathError.NO_ERROR) {
            return (err0, 0);
        }

        return subUInt(sum, c);
    }
}


/**
 * @title Exponential module for storing fixed-precision decimals
 * @author Compound
 * @notice Exp is a struct which stores decimals with a fixed precision of 18 decimal places.
 *         Thus, if we wanted to store the 5.1, mantissa would store 5.1e18. That is:
 *         `Exp({mantissa: 5100000000000000000})`.
 */
contract Exponential is CarefulMath {
    uint256 constant expScale = 1e18;
    uint256 constant doubleScale = 1e36;
    uint256 constant halfExpScale = expScale / 2;
    uint256 constant mantissaOne = expScale;

    struct Exp {
        uint256 mantissa;
    }

    struct Double {
        uint256 mantissa;
    }

    /**
     * @dev Creates an exponential from numerator and denominator values.
     *      Note: Returns an error if (`num` * 10e18) > MAX_INT,
     *            or if `denom` is zero.
     */
    function getExp(uint256 num, uint256 denom) internal pure returns (MathError, Exp memory) {
        (MathError err0, uint256 scaledNumerator) = mulUInt(num, expScale);
        if (err0 != MathError.NO_ERROR) {
            return (err0, Exp({mantissa: 0}));
        }

        (MathError err1, uint256 rational) = divUInt(scaledNumerator, denom);
        if (err1 != MathError.NO_ERROR) {
            return (err1, Exp({mantissa: 0}));
        }

        return (MathError.NO_ERROR, Exp({mantissa: rational}));
    }

    /**
     * @dev Adds two exponentials, returning a new exponential.
     */
    function addExp(Exp memory a, Exp memory b) internal pure returns (MathError, Exp memory) {
        (MathError error, uint256 result) = addUInt(a.mantissa, b.mantissa);

        return (error, Exp({mantissa: result}));
    }

    /**
     * @dev Subtracts two exponentials, returning a new exponential.
     */
    function subExp(Exp memory a, Exp memory b) internal pure returns (MathError, Exp memory) {
        (MathError error, uint256 result) = subUInt(a.mantissa, b.mantissa);

        return (error, Exp({mantissa: result}));
    }

    /**
     * @dev Multiply an Exp by a scalar, returning a new Exp.
     */
    function mulScalar(Exp memory a, uint256 scalar) internal pure returns (MathError, Exp memory) {
        (MathError err0, uint256 scaledMantissa) = mulUInt(a.mantissa, scalar);
        if (err0 != MathError.NO_ERROR) {
            return (err0, Exp({mantissa: 0}));
        }

        return (MathError.NO_ERROR, Exp({mantissa: scaledMantissa}));
    }

    /**
     * @dev Multiply an Exp by a scalar, then truncate to return an unsigned integer.
     */
    function mulScalarTruncate(Exp memory a, uint256 scalar) internal pure returns (MathError, uint256) {
        (MathError err, Exp memory product) = mulScalar(a, scalar);
        if (err != MathError.NO_ERROR) {
            return (err, 0);
        }

        return (MathError.NO_ERROR, truncate(product));
    }

    /**
     * @dev Multiply an Exp by a scalar, truncate, then add an to an unsigned integer, returning an unsigned integer.
     */
    function mulScalarTruncateAddUInt(
        Exp memory a,
        uint256 scalar,
        uint256 addend
    ) internal pure returns (MathError, uint256) {
        (MathError err, Exp memory product) = mulScalar(a, scalar);
        if (err != MathError.NO_ERROR) {
            return (err, 0);
        }

        return addUInt(truncate(product), addend);
    }

    /**
     * @dev Multiply an Exp by a scalar, then truncate to return an unsigned integer.
     */
    function mul_ScalarTruncate(Exp memory a, uint256 scalar) internal pure returns (uint256) {
        Exp memory product = mul_(a, scalar);
        return truncate(product);
    }

    /**
     * @dev Multiply an Exp by a scalar, truncate, then add an to an unsigned integer, returning an unsigned integer.
     */
    function mul_ScalarTruncateAddUInt(
        Exp memory a,
        uint256 scalar,
        uint256 addend
    ) internal pure returns (uint256) {
        Exp memory product = mul_(a, scalar);
        return add_(truncate(product), addend);
    }

    /**
     * @dev Divide an Exp by a scalar, returning a new Exp.
     */
    function divScalar(Exp memory a, uint256 scalar) internal pure returns (MathError, Exp memory) {
        (MathError err0, uint256 descaledMantissa) = divUInt(a.mantissa, scalar);
        if (err0 != MathError.NO_ERROR) {
            return (err0, Exp({mantissa: 0}));
        }

        return (MathError.NO_ERROR, Exp({mantissa: descaledMantissa}));
    }

    /**
     * @dev Divide a scalar by an Exp, returning a new Exp.
     */
    function divScalarByExp(uint256 scalar, Exp memory divisor) internal pure returns (MathError, Exp memory) {
        /*
          We are doing this as:
          getExp(mulUInt(expScale, scalar), divisor.mantissa)

          How it works:
          Exp = a / b;
          Scalar = s;
          `s / (a / b)` = `b * s / a` and since for an Exp `a = mantissa, b = expScale`
        */
        (MathError err0, uint256 numerator) = mulUInt(expScale, scalar);
        if (err0 != MathError.NO_ERROR) {
            return (err0, Exp({mantissa: 0}));
        }
        return getExp(numerator, divisor.mantissa);
    }

    /**
     * @dev Divide a scalar by an Exp, then truncate to return an unsigned integer.
     */
    function divScalarByExpTruncate(uint256 scalar, Exp memory divisor) internal pure returns (MathError, uint256) {
        (MathError err, Exp memory fraction) = divScalarByExp(scalar, divisor);
        if (err != MathError.NO_ERROR) {
            return (err, 0);
        }

        return (MathError.NO_ERROR, truncate(fraction));
    }

    /**
     * @dev Divide a scalar by an Exp, returning a new Exp.
     */
    function div_ScalarByExp(uint256 scalar, Exp memory divisor) internal pure returns (Exp memory) {
        /*
          We are doing this as:
          getExp(mulUInt(expScale, scalar), divisor.mantissa)

          How it works:
          Exp = a / b;
          Scalar = s;
          `s / (a / b)` = `b * s / a` and since for an Exp `a = mantissa, b = expScale`
        */
        uint256 numerator = mul_(expScale, scalar);
        return Exp({mantissa: div_(numerator, divisor)});
    }

    /**
     * @dev Divide a scalar by an Exp, then truncate to return an unsigned integer.
     */
    function div_ScalarByExpTruncate(uint256 scalar, Exp memory divisor) internal pure returns (uint256) {
        Exp memory fraction = div_ScalarByExp(scalar, divisor);
        return truncate(fraction);
    }

    /**
     * @dev Multiplies two exponentials, returning a new exponential.
     */
    function mulExp(Exp memory a, Exp memory b) internal pure returns (MathError, Exp memory) {
        (MathError err0, uint256 doubleScaledProduct) = mulUInt(a.mantissa, b.mantissa);
        if (err0 != MathError.NO_ERROR) {
            return (err0, Exp({mantissa: 0}));
        }

        // We add half the scale before dividing so that we get rounding instead of truncation.
        //  See "Listing 6" and text above it at https://accu.org/index.php/journals/1717
        // Without this change, a result like 6.6...e-19 will be truncated to 0 instead of being rounded to 1e-18.
        (MathError err1, uint256 doubleScaledProductWithHalfScale) = addUInt(halfExpScale, doubleScaledProduct);
        if (err1 != MathError.NO_ERROR) {
            return (err1, Exp({mantissa: 0}));
        }

        (MathError err2, uint256 product) = divUInt(doubleScaledProductWithHalfScale, expScale);
        // The only error `div` can return is MathError.DIVISION_BY_ZERO but we control `expScale` and it is not zero.
        assert(err2 == MathError.NO_ERROR);

        return (MathError.NO_ERROR, Exp({mantissa: product}));
    }

    /**
     * @dev Multiplies two exponentials given their mantissas, returning a new exponential.
     */
    function mulExp(uint256 a, uint256 b) internal pure returns (MathError, Exp memory) {
        return mulExp(Exp({mantissa: a}), Exp({mantissa: b}));
    }

    /**
     * @dev Multiplies three exponentials, returning a new exponential.
     */
    function mulExp3(
        Exp memory a,
        Exp memory b,
        Exp memory c
    ) internal pure returns (MathError, Exp memory) {
        (MathError err, Exp memory ab) = mulExp(a, b);
        if (err != MathError.NO_ERROR) {
            return (err, ab);
        }
        return mulExp(ab, c);
    }

    /**
     * @dev Divides two exponentials, returning a new exponential.
     *     (a/scale) / (b/scale) = (a/scale) * (scale/b) = a/b,
     *  which we can scale as an Exp by calling getExp(a.mantissa, b.mantissa)
     */
    function divExp(Exp memory a, Exp memory b) internal pure returns (MathError, Exp memory) {
        return getExp(a.mantissa, b.mantissa);
    }

    /**
     * @dev Truncates the given exp to a whole number value.
     *      For example, truncate(Exp{mantissa: 15 * expScale}) = 15
     */
    function truncate(Exp memory exp) internal pure returns (uint256) {
        // Note: We are not using careful math here as we're performing a division that cannot fail
        return exp.mantissa / expScale;
    }

    /**
     * @dev Checks if first Exp is less than second Exp.
     */
    function lessThanExp(Exp memory left, Exp memory right) internal pure returns (bool) {
        return left.mantissa < right.mantissa;
    }

    /**
     * @dev Checks if left Exp <= right Exp.
     */
    function lessThanOrEqualExp(Exp memory left, Exp memory right) internal pure returns (bool) {
        return left.mantissa <= right.mantissa;
    }

    /**
     * @dev returns true if Exp is exactly zero
     */
    function isZeroExp(Exp memory value) internal pure returns (bool) {
        return value.mantissa == 0;
    }

    function safe224(uint256 n, string memory errorMessage) internal pure returns (uint224) {
        require(n < 2**224, errorMessage);
        return uint224(n);
    }

    function safe32(uint256 n, string memory errorMessage) internal pure returns (uint32) {
        require(n < 2**32, errorMessage);
        return uint32(n);
    }

    function add_(Exp memory a, Exp memory b) internal pure returns (Exp memory) {
        return Exp({mantissa: add_(a.mantissa, b.mantissa)});
    }

    function add_(Double memory a, Double memory b) internal pure returns (Double memory) {
        return Double({mantissa: add_(a.mantissa, b.mantissa)});
    }

    function add_(uint256 a, uint256 b) internal pure returns (uint256) {
        return add_(a, b, "addition overflow");
    }

    function add_(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, errorMessage);
        return c;
    }

    function sub_(Exp memory a, Exp memory b) internal pure returns (Exp memory) {
        return Exp({mantissa: sub_(a.mantissa, b.mantissa)});
    }

    function sub_(Double memory a, Double memory b) internal pure returns (Double memory) {
        return Double({mantissa: sub_(a.mantissa, b.mantissa)});
    }

    function sub_(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub_(a, b, "subtraction underflow");
    }

    function sub_(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    function mul_(Exp memory a, Exp memory b) internal pure returns (Exp memory) {
        return Exp({mantissa: mul_(a.mantissa, b.mantissa) / expScale});
    }

    function mul_(Exp memory a, uint256 b) internal pure returns (Exp memory) {
        return Exp({mantissa: mul_(a.mantissa, b)});
    }

    function mul_(uint256 a, Exp memory b) internal pure returns (uint256) {
        return mul_(a, b.mantissa) / expScale;
    }

    function mul_(Double memory a, Double memory b) internal pure returns (Double memory) {
        return Double({mantissa: mul_(a.mantissa, b.mantissa) / doubleScale});
    }

    function mul_(Double memory a, uint256 b) internal pure returns (Double memory) {
        return Double({mantissa: mul_(a.mantissa, b)});
    }

    function mul_(uint256 a, Double memory b) internal pure returns (uint256) {
        return mul_(a, b.mantissa) / doubleScale;
    }

    function mul_(uint256 a, uint256 b) internal pure returns (uint256) {
        return mul_(a, b, "multiplication overflow");
    }

    function mul_(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        if (a == 0 || b == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, errorMessage);
        return c;
    }

    function div_(Exp memory a, Exp memory b) internal pure returns (Exp memory) {
        return Exp({mantissa: div_(mul_(a.mantissa, expScale), b.mantissa)});
    }

    function div_(Exp memory a, uint256 b) internal pure returns (Exp memory) {
        return Exp({mantissa: div_(a.mantissa, b)});
    }

    function div_(uint256 a, Exp memory b) internal pure returns (uint256) {
        return div_(mul_(a, expScale), b.mantissa);
    }

    function div_(Double memory a, Double memory b) internal pure returns (Double memory) {
        return Double({mantissa: div_(mul_(a.mantissa, doubleScale), b.mantissa)});
    }

    function div_(Double memory a, uint256 b) internal pure returns (Double memory) {
        return Double({mantissa: div_(a.mantissa, b)});
    }

    function div_(uint256 a, Double memory b) internal pure returns (uint256) {
        return div_(mul_(a, doubleScale), b.mantissa);
    }

    function div_(uint256 a, uint256 b) internal pure returns (uint256) {
        return div_(a, b, "divide by zero");
    }

    function div_(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    function fraction(uint256 a, uint256 b) internal pure returns (Double memory) {
        return Double({mantissa: div_(mul_(a, doubleScale), b)});
    }

    // implementation from https://github.com/Uniswap/uniswap-lib/commit/99f3f28770640ba1bb1ff460ac7c5292fb8291a0
    // original implementation: https://github.com/abdk-consulting/abdk-libraries-solidity/blob/master/ABDKMath64x64.sol#L687
    function sqrt(uint256 x) internal pure returns (uint256) {
        if (x == 0) return 0;
        uint256 xx = x;
        uint256 r = 1;

        if (xx >= 0x100000000000000000000000000000000) {
            xx >>= 128;
            r <<= 64;
        }
        if (xx >= 0x10000000000000000) {
            xx >>= 64;
            r <<= 32;
        }
        if (xx >= 0x100000000) {
            xx >>= 32;
            r <<= 16;
        }
        if (xx >= 0x10000) {
            xx >>= 16;
            r <<= 8;
        }
        if (xx >= 0x100) {
            xx >>= 8;
            r <<= 4;
        }
        if (xx >= 0x10) {
            xx >>= 4;
            r <<= 2;
        }
        if (xx >= 0x8) {
            r <<= 1;
        }

        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1; // Seven iterations should be enough
        uint256 r1 = x / r;
        return (r < r1 ? r : r1);
    }
}
















contract UnitrollerAdminStorage {
    /**
     * @notice Administrator for this contract
     */
    address public admin;

    /**
     * @notice Pending administrator for this contract
     */
    address public pendingAdmin;

    /**
     * @notice Active brains of Unitroller
     */
    address public implementation;

    /**
     * @notice Pending brains of Unitroller
     */
    address public pendingImplementation;
}

contract JoetrollerV1Storage is UnitrollerAdminStorage {
    /**
     * @notice Oracle which gives the price of any given asset
     */
    PriceOracle public oracle;

    /**
     * @notice Multiplier used to calculate the maximum repayAmount when liquidating a borrow
     */
    uint256 public closeFactorMantissa;

    /**
     * @notice Multiplier representing the discount on collateral that a liquidator receives
     */
    uint256 public liquidationIncentiveMantissa;

    /**
     * @notice Per-account mapping of "assets you are in"
     */
    mapping(address => JToken[]) public accountAssets;

    enum Version {
        VANILLA,
        COLLATERALCAP,
        WRAPPEDNATIVE
    }

    struct Market {
        /// @notice Whether or not this market is listed
        bool isListed;
        /**
         * @notice Multiplier representing the most one can borrow against their collateral in this market.
         *  For instance, 0.9 to allow borrowing 90% of collateral value.
         *  Must be between 0 and 1, and stored as a mantissa.
         */
        uint256 collateralFactorMantissa;
        /// @notice Per-market mapping of "accounts in this asset"
        mapping(address => bool) accountMembership;
        /// @notice JToken version
        Version version;
    }

    /**
     * @notice Official mapping of jTokens -> Market metadata
     * @dev Used e.g. to determine if a market is supported
     */
    mapping(address => Market) public markets;

    /**
     * @notice The Pause Guardian can pause certain actions as a safety mechanism.
     *  Actions which allow users to remove their own assets cannot be paused.
     *  Liquidation / seizing / transfer can only be paused globally, not by market.
     */
    address public pauseGuardian;
    bool public _mintGuardianPaused;
    bool public _borrowGuardianPaused;
    bool public transferGuardianPaused;
    bool public seizeGuardianPaused;
    mapping(address => bool) public mintGuardianPaused;
    mapping(address => bool) public borrowGuardianPaused;

    /// @notice A list of all markets
    JToken[] public allMarkets;

    // @notice The borrowCapGuardian can set borrowCaps to any number for any market. Lowering the borrow cap could disable borrowing on the given market.
    address public borrowCapGuardian;

    // @notice Borrow caps enforced by borrowAllowed for each jToken address. Defaults to zero which corresponds to unlimited borrowing.
    mapping(address => uint256) public borrowCaps;

    // @notice The supplyCapGuardian can set supplyCaps to any number for any market. Lowering the supply cap could disable supplying to the given market.
    address public supplyCapGuardian;

    // @notice Supply caps enforced by mintAllowed for each jToken address. Defaults to zero which corresponds to unlimited supplying.
    mapping(address => uint256) public supplyCaps;

    // @notice creditLimits allowed specific protocols to borrow and repay without collateral.
    mapping(address => uint256) public creditLimits;

    // @notice flashloanGuardianPaused can pause flash loan as a safety mechanism.
    mapping(address => bool) public flashloanGuardianPaused;

    // @notice rewardDistributor The module that handles reward distribution.
    address payable public rewardDistributor;
}


contract JoetrollerInterface {
    /// @notice Indicator that this is a Joetroller contract (for inspection)
    bool public constant isJoetroller = true;

    /*** Assets You Are In ***/

    function enterMarkets(address[] calldata jTokens) external returns (uint256[] memory);

    function exitMarket(address jToken) external returns (uint256);

    /*** Policy Hooks ***/

    function mintAllowed(
        address jToken,
        address minter,
        uint256 mintAmount
    ) external returns (uint256);

    function mintVerify(
        address jToken,
        address minter,
        uint256 mintAmount,
        uint256 mintTokens
    ) external;

    function redeemAllowed(
        address jToken,
        address redeemer,
        uint256 redeemTokens
    ) external returns (uint256);

    function redeemVerify(
        address jToken,
        address redeemer,
        uint256 redeemAmount,
        uint256 redeemTokens
    ) external;

    function borrowAllowed(
        address jToken,
        address borrower,
        uint256 borrowAmount
    ) external returns (uint256);

    function borrowVerify(
        address jToken,
        address borrower,
        uint256 borrowAmount
    ) external;

    function repayBorrowAllowed(
        address jToken,
        address payer,
        address borrower,
        uint256 repayAmount
    ) external returns (uint256);

    function repayBorrowVerify(
        address jToken,
        address payer,
        address borrower,
        uint256 repayAmount,
        uint256 borrowerIndex
    ) external;

    function liquidateBorrowAllowed(
        address jTokenBorrowed,
        address jTokenCollateral,
        address liquidator,
        address borrower,
        uint256 repayAmount
    ) external returns (uint256);

    function liquidateBorrowVerify(
        address jTokenBorrowed,
        address jTokenCollateral,
        address liquidator,
        address borrower,
        uint256 repayAmount,
        uint256 seizeTokens
    ) external;

    function seizeAllowed(
        address jTokenCollateral,
        address jTokenBorrowed,
        address liquidator,
        address borrower,
        uint256 seizeTokens
    ) external returns (uint256);

    function seizeVerify(
        address jTokenCollateral,
        address jTokenBorrowed,
        address liquidator,
        address borrower,
        uint256 seizeTokens
    ) external;

    function transferAllowed(
        address jToken,
        address src,
        address dst,
        uint256 transferTokens
    ) external returns (uint256);

    function transferVerify(
        address jToken,
        address src,
        address dst,
        uint256 transferTokens
    ) external;

    /*** Liquidity/Liquidation Calculations ***/

    function liquidateCalculateSeizeTokens(
        address jTokenBorrowed,
        address jTokenCollateral,
        uint256 repayAmount
    ) external view returns (uint256, uint256);
}

interface JoetrollerInterfaceExtension {
    function checkMembership(address account, JToken jToken) external view returns (bool);

    function updateJTokenVersion(address jToken, JoetrollerV1Storage.Version version) external;

    function flashloanAllowed(
        address jToken,
        address receiver,
        uint256 amount,
        bytes calldata params
    ) external view returns (bool);
}









contract JTokenStorage {
    /**
     * @dev Guard variable for re-entrancy checks
     */
    bool internal _notEntered;

    /**
     * @notice EIP-20 token name for this token
     */
    string public name;

    /**
     * @notice EIP-20 token symbol for this token
     */
    string public symbol;

    /**
     * @notice EIP-20 token decimals for this token
     */
    uint8 public decimals;

    /**
     * @notice Maximum borrow rate that can ever be applied (.0005% / sec)
     */

    uint256 internal constant borrowRateMaxMantissa = 0.0005e16;

    /**
     * @notice Maximum fraction of interest that can be set aside for reserves
     */
    uint256 internal constant reserveFactorMaxMantissa = 1e18;

    /**
     * @notice Administrator for this contract
     */
    address payable public admin;

    /**
     * @notice Pending administrator for this contract
     */
    address payable public pendingAdmin;

    /**
     * @notice Contract which oversees inter-jToken operations
     */
    JoetrollerInterface public joetroller;

    /**
     * @notice Model which tells what the current interest rate should be
     */
    InterestRateModel public interestRateModel;

    /**
     * @notice Initial exchange rate used when minting the first JTokens (used when totalSupply = 0)
     */
    uint256 internal initialExchangeRateMantissa;

    /**
     * @notice Fraction of interest currently set aside for reserves
     */
    uint256 public reserveFactorMantissa;

    /**
     * @notice Block timestamp that interest was last accrued at
     */
    uint256 public accrualBlockTimestamp;

    /**
     * @notice Accumulator of the total earned interest rate since the opening of the market
     */
    uint256 public borrowIndex;

    /**
     * @notice Total amount of outstanding borrows of the underlying in this market
     */
    uint256 public totalBorrows;

    /**
     * @notice Total amount of reserves of the underlying held in this market
     */
    uint256 public totalReserves;

    /**
     * @notice Total number of tokens in circulation
     */
    uint256 public totalSupply;

    /**
     * @notice Official record of token balances for each account
     */
    mapping(address => uint256) internal accountTokens;

    /**
     * @notice Approved token transfer amounts on behalf of others
     */
    mapping(address => mapping(address => uint256)) internal transferAllowances;

    /**
     * @notice Container for borrow balance information
     * @member principal Total balance (with accrued interest), after applying the most recent balance-changing action
     * @member interestIndex Global borrowIndex as of the most recent balance-changing action
     */
    struct BorrowSnapshot {
        uint256 principal;
        uint256 interestIndex;
    }

    /**
     * @notice Mapping of account addresses to outstanding borrow balances
     */
    mapping(address => BorrowSnapshot) internal accountBorrows;
}

contract JErc20Storage {
    /**
     * @notice Underlying asset for this JToken
     */
    address public underlying;

    /**
     * @notice Implementation address for this contract
     */
    address public implementation;
}

contract JSupplyCapStorage {
    /**
     * @notice Internal cash counter for this JToken. Should equal underlying.balanceOf(address(this)) for CERC20.
     */
    uint256 public internalCash;
}

contract JCollateralCapStorage {
    /**
     * @notice Total number of tokens used as collateral in circulation.
     */
    uint256 public totalCollateralTokens;

    /**
     * @notice Record of token balances which could be treated as collateral for each account.
     *         If collateral cap is not set, the value should be equal to accountTokens.
     */
    mapping(address => uint256) public accountCollateralTokens;

    /**
     * @notice Check if accountCollateralTokens have been initialized.
     */
    mapping(address => bool) public isCollateralTokenInit;

    /**
     * @notice Collateral cap for this JToken, zero for no cap.
     */
    uint256 public collateralCap;
}

/*** Interface ***/

contract JTokenInterface is JTokenStorage {
    /**
     * @notice Indicator that this is a JToken contract (for inspection)
     */
    bool public constant isJToken = true;

    /*** Market Events ***/

    /**
     * @notice Event emitted when interest is accrued
     */
    event AccrueInterest(uint256 cashPrior, uint256 interestAccumulated, uint256 borrowIndex, uint256 totalBorrows);

    /**
     * @notice Event emitted when tokens are minted
     */
    event Mint(address minter, uint256 mintAmount, uint256 mintTokens);

    /**
     * @notice Event emitted when tokens are redeemed
     */
    event Redeem(address redeemer, uint256 redeemAmount, uint256 redeemTokens);

    /**
     * @notice Event emitted when underlying is borrowed
     */
    event Borrow(address borrower, uint256 borrowAmount, uint256 accountBorrows, uint256 totalBorrows);

    /**
     * @notice Event emitted when a borrow is repaid
     */
    event RepayBorrow(
        address payer,
        address borrower,
        uint256 repayAmount,
        uint256 accountBorrows,
        uint256 totalBorrows
    );

    /**
     * @notice Event emitted when a borrow is liquidated
     */
    event LiquidateBorrow(
        address liquidator,
        address borrower,
        uint256 repayAmount,
        address jTokenCollateral,
        uint256 seizeTokens
    );

    /*** Admin Events ***/

    /**
     * @notice Event emitted when pendingAdmin is changed
     */
    event NewPendingAdmin(address oldPendingAdmin, address newPendingAdmin);

    /**
     * @notice Event emitted when pendingAdmin is accepted, which means admin is updated
     */
    event NewAdmin(address oldAdmin, address newAdmin);

    /**
     * @notice Event emitted when joetroller is changed
     */
    event NewJoetroller(JoetrollerInterface oldJoetroller, JoetrollerInterface newJoetroller);

    /**
     * @notice Event emitted when interestRateModel is changed
     */
    event NewMarketInterestRateModel(InterestRateModel oldInterestRateModel, InterestRateModel newInterestRateModel);

    /**
     * @notice Event emitted when the reserve factor is changed
     */
    event NewReserveFactor(uint256 oldReserveFactorMantissa, uint256 newReserveFactorMantissa);

    /**
     * @notice Event emitted when the reserves are added
     */
    event ReservesAdded(address benefactor, uint256 addAmount, uint256 newTotalReserves);

    /**
     * @notice Event emitted when the reserves are reduced
     */
    event ReservesReduced(address admin, uint256 reduceAmount, uint256 newTotalReserves);

    /**
     * @notice EIP20 Transfer event
     */
    event Transfer(address indexed from, address indexed to, uint256 amount);

    /**
     * @notice EIP20 Approval event
     */
    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /**
     * @notice Failure event
     */
    event Failure(uint256 error, uint256 info, uint256 detail);

    /*** User Interface ***/

    function transfer(address dst, uint256 amount) external returns (bool);

    function transferFrom(
        address src,
        address dst,
        uint256 amount
    ) external returns (bool);

    function approve(address spender, uint256 amount) external returns (bool);

    function allowance(address owner, address spender) external view returns (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function balanceOfUnderlying(address owner) external returns (uint256);

    function getAccountSnapshot(address account)
        external
        view
        returns (
            uint256,
            uint256,
            uint256,
            uint256
        );

    function borrowRatePerSecond() external view returns (uint256);

    function supplyRatePerSecond() external view returns (uint256);

    function totalBorrowsCurrent() external returns (uint256);

    function borrowBalanceCurrent(address account) external returns (uint256);

    function borrowBalanceStored(address account) public view returns (uint256);

    function exchangeRateCurrent() public returns (uint256);

    function exchangeRateStored() public view returns (uint256);

    function getCash() external view returns (uint256);

    function accrueInterest() public returns (uint256);

    function seize(
        address liquidator,
        address borrower,
        uint256 seizeTokens
    ) external returns (uint256);

    /*** Admin Functions ***/

    function _setPendingAdmin(address payable newPendingAdmin) external returns (uint256);

    function _acceptAdmin() external returns (uint256);

    function _setJoetroller(JoetrollerInterface newJoetroller) public returns (uint256);

    function _setReserveFactor(uint256 newReserveFactorMantissa) external returns (uint256);

    function _reduceReserves(uint256 reduceAmount) external returns (uint256);

    function _setInterestRateModel(InterestRateModel newInterestRateModel) public returns (uint256);
}

contract JErc20Interface is JErc20Storage {
    /*** User Interface ***/

    function mint(uint256 mintAmount) external returns (uint256);

    function redeem(uint256 redeemTokens) external returns (uint256);

    function redeemUnderlying(uint256 redeemAmount) external returns (uint256);

    function borrow(uint256 borrowAmount) external returns (uint256);

    function repayBorrow(uint256 repayAmount) external returns (uint256);

    function repayBorrowBehalf(address borrower, uint256 repayAmount) external returns (uint256);

    function liquidateBorrow(
        address borrower,
        uint256 repayAmount,
        JTokenInterface jTokenCollateral
    ) external returns (uint256);

    function _addReserves(uint256 addAmount) external returns (uint256);
}

contract JWrappedNativeInterface is JErc20Interface {
    /**
     * @notice Flash loan fee ratio
     */
    uint256 public constant flashFeeBips = 8;

    /*** Market Events ***/

    /**
     * @notice Event emitted when a flashloan occured
     */
    event Flashloan(address indexed receiver, uint256 amount, uint256 totalFee, uint256 reservesFee);

    /*** User Interface ***/

    function mintNative() external payable returns (uint256);

    function redeemNative(uint256 redeemTokens) external returns (uint256);

    function redeemUnderlyingNative(uint256 redeemAmount) external returns (uint256);

    function borrowNative(uint256 borrowAmount) external returns (uint256);

    function repayBorrowNative() external payable returns (uint256);

    function repayBorrowBehalfNative(address borrower) external payable returns (uint256);

    function liquidateBorrowNative(address borrower, JTokenInterface jTokenCollateral)
        external
        payable
        returns (uint256);

    function flashLoan(
        ERC3156FlashBorrowerInterface receiver,
        address initiator,
        uint256 amount,
        bytes calldata data
    ) external returns (bool);

    function _addReservesNative() external payable returns (uint256);
}

contract JCapableErc20Interface is JErc20Interface, JSupplyCapStorage {
    /**
     * @notice Flash loan fee ratio
     */
    uint256 public constant flashFeeBips = 8;

    /*** Market Events ***/

    /**
     * @notice Event emitted when a flashloan occured
     */
    event Flashloan(address indexed receiver, uint256 amount, uint256 totalFee, uint256 reservesFee);

    /*** User Interface ***/

    function gulp() external;
}

contract JCollateralCapErc20Interface is JCapableErc20Interface, JCollateralCapStorage {
    /*** Admin Events ***/

    /**
     * @notice Event emitted when collateral cap is set
     */
    event NewCollateralCap(address token, uint256 newCap);

    /**
     * @notice Event emitted when user collateral is changed
     */
    event UserCollateralChanged(address account, uint256 newCollateralTokens);

    /*** User Interface ***/

    function registerCollateral(address account) external returns (uint256);

    function unregisterCollateral(address account) external;

    function flashLoan(
        ERC3156FlashBorrowerInterface receiver,
        address initiator,
        uint256 amount,
        bytes calldata data
    ) external returns (bool);

    /*** Admin Functions ***/

    function _setCollateralCap(uint256 newCollateralCap) external;
}

contract JDelegatorInterface {
    /**
     * @notice Emitted when implementation is changed
     */
    event NewImplementation(address oldImplementation, address newImplementation);

    /**
     * @notice Called by the admin to update the implementation of the delegator
     * @param implementation_ The address of the new implementation for delegation
     * @param allowResign Flag to indicate whether to call _resignImplementation on the old implementation
     * @param becomeImplementationData The encoded bytes data to be passed to _becomeImplementation
     */
    function _setImplementation(
        address implementation_,
        bool allowResign,
        bytes memory becomeImplementationData
    ) public;
}

contract JDelegateInterface {
    /**
     * @notice Called by the delegator on a delegate to initialize it for duty
     * @dev Should revert if any issues arise which make it unfit for delegation
     * @param data The encoded bytes data for any initialization
     */
    function _becomeImplementation(bytes memory data) public;

    /**
     * @notice Called by the delegator on a delegate to forfeit its responsibility
     */
    function _resignImplementation() public;
}

/*** External interface ***/

/**
 * @title Flash loan receiver interface
 */
interface IFlashloanReceiver {
    function executeOperation(
        address sender,
        address underlying,
        uint256 amount,
        uint256 fee,
        bytes calldata params
    ) external;
}

contract JProtocolSeizeShareStorage {
    /**
     * @notice Event emitted when the protocol share of seized collateral is changed
     */
    event NewProtocolSeizeShare(uint256 oldProtocolSeizeShareMantissa, uint256 newProtocolSeizeShareMantissa);

    /**
     * @notice Share of seized collateral that is added to reserves
     */
    uint256 public protocolSeizeShareMantissa;

    /**
     * @notice Maximum fraction of seized collateral that can be set aside for reserves
     */
    uint256 internal constant protocolSeizeShareMaxMantissa = 1e18;
}








/**
 * @title EIP20NonStandardInterface
 * @dev Version of ERC20 with no return values for `transfer` and `transferFrom`
 *  See https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca
 */
interface EIP20NonStandardInterface {
    /**
     * @notice Get the total number of tokens in circulation
     * @return The supply of tokens
     */
    function totalSupply() external view returns (uint256);

    /**
     * @notice Gets the balance of the specified address
     * @param owner The address from which the balance will be retrieved
     * @return The balance
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    ///
    /// !!!!!!!!!!!!!!
    /// !!! NOTICE !!! `transfer` does not return a value, in violation of the ERC-20 specification
    /// !!!!!!!!!!!!!!
    ///

    /**
     * @notice Transfer `amount` tokens from `msg.sender` to `dst`
     * @param dst The address of the destination account
     * @param amount The number of tokens to transfer
     */
    function transfer(address dst, uint256 amount) external;

    ///
    /// !!!!!!!!!!!!!!
    /// !!! NOTICE !!! `transferFrom` does not return a value, in violation of the ERC-20 specification
    /// !!!!!!!!!!!!!!
    ///

    /**
     * @notice Transfer `amount` tokens from `src` to `dst`
     * @param src The address of the source account
     * @param dst The address of the destination account
     * @param amount The number of tokens to transfer
     */
    function transferFrom(
        address src,
        address dst,
        uint256 amount
    ) external;

    /**
     * @notice Approve `spender` to transfer up to `amount` from `src`
     * @dev This will overwrite the approval amount for `spender`
     *  and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
     * @param spender The address of the account which may transfer tokens
     * @param amount The number of tokens that are approved
     * @return Whether or not the approval succeeded
     */
    function approve(address spender, uint256 amount) external returns (bool success);

    /**
     * @notice Get the current allowance from `owner` for `spender`
     * @param owner The address of the account which owns the tokens to be spent
     * @param spender The address of the account which may transfer tokens
     * @return The number of tokens allowed to be spent
     */
    function allowance(address owner, address spender) external view returns (uint256 remaining);

    event Transfer(address indexed from, address indexed to, uint256 amount);
    event Approval(address indexed owner, address indexed spender, uint256 amount);
}



/**
 * @title Compound's JToken Contract
 * @notice Abstract base for JTokens
 * @author Compound
 */
contract JToken is JTokenInterface, Exponential, TokenErrorReporter {
    /**
     * @notice Initialize the money market
     * @param joetroller_ The address of the Joetroller
     * @param interestRateModel_ The address of the interest rate model
     * @param initialExchangeRateMantissa_ The initial exchange rate, scaled by 1e18
     * @param name_ EIP-20 name of this token
     * @param symbol_ EIP-20 symbol of this token
     * @param decimals_ EIP-20 decimal precision of this token
     */
    function initialize(
        JoetrollerInterface joetroller_,
        InterestRateModel interestRateModel_,
        uint256 initialExchangeRateMantissa_,
        string memory name_,
        string memory symbol_,
        uint8 decimals_
    ) public {
        require(msg.sender == admin, "only admin may initialize the market");
        require(accrualBlockTimestamp == 0 && borrowIndex == 0, "market may only be initialized once");

        // Set initial exchange rate
        initialExchangeRateMantissa = initialExchangeRateMantissa_;
        require(initialExchangeRateMantissa > 0, "initial exchange rate must be greater than zero.");

        // Set the joetroller
        uint256 err = _setJoetroller(joetroller_);
        require(err == uint256(Error.NO_ERROR), "setting joetroller failed");

        // Initialize block timestamp and borrow index (block timestamp mocks depend on joetroller being set)
        accrualBlockTimestamp = getBlockTimestamp();
        borrowIndex = mantissaOne;

        // Set the interest rate model (depends on block timestamp / borrow index)
        err = _setInterestRateModelFresh(interestRateModel_);
        require(err == uint256(Error.NO_ERROR), "setting interest rate model failed");

        name = name_;
        symbol = symbol_;
        decimals = decimals_;

        // The counter starts true to prevent changing it from zero to non-zero (i.e. smaller cost/refund)
        _notEntered = true;
    }

    /**
     * @notice Transfer `amount` tokens from `msg.sender` to `dst`
     * @param dst The address of the destination account
     * @param amount The number of tokens to transfer
     * @return Whether or not the transfer succeeded
     */
    function transfer(address dst, uint256 amount) external nonReentrant returns (bool) {
        return transferTokens(msg.sender, msg.sender, dst, amount) == uint256(Error.NO_ERROR);
    }

    /**
     * @notice Transfer `amount` tokens from `src` to `dst`
     * @param src The address of the source account
     * @param dst The address of the destination account
     * @param amount The number of tokens to transfer
     * @return Whether or not the transfer succeeded
     */
    function transferFrom(
        address src,
        address dst,
        uint256 amount
    ) external nonReentrant returns (bool) {
        return transferTokens(msg.sender, src, dst, amount) == uint256(Error.NO_ERROR);
    }

    /**
     * @notice Approve `spender` to transfer up to `amount` from `src`
     * @dev This will overwrite the approval amount for `spender`
     *  and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
     * @param spender The address of the account which may transfer tokens
     * @param amount The number of tokens that are approved (-1 means infinite)
     * @return Whether or not the approval succeeded
     */
    function approve(address spender, uint256 amount) external returns (bool) {
        address src = msg.sender;
        transferAllowances[src][spender] = amount;
        emit Approval(src, spender, amount);
        return true;
    }

    /**
     * @notice Get the current allowance from `owner` for `spender`
     * @param owner The address of the account which owns the tokens to be spent
     * @param spender The address of the account which may transfer tokens
     * @return The number of tokens allowed to be spent (-1 means infinite)
     */
    function allowance(address owner, address spender) external view returns (uint256) {
        return transferAllowances[owner][spender];
    }

    /**
     * @notice Get the token balance of the `owner`
     * @param owner The address of the account to query
     * @return The number of tokens owned by `owner`
     */
    function balanceOf(address owner) external view returns (uint256) {
        return accountTokens[owner];
    }

    /**
     * @notice Get the underlying balance of the `owner`
     * @dev This also accrues interest in a transaction
     * @param owner The address of the account to query
     * @return The amount of underlying owned by `owner`
     */
    function balanceOfUnderlying(address owner) external returns (uint256) {
        Exp memory exchangeRate = Exp({mantissa: exchangeRateCurrent()});
        return mul_ScalarTruncate(exchangeRate, accountTokens[owner]);
    }

    /**
     * @notice Get a snapshot of the account's balances, and the cached exchange rate
     * @dev This is used by joetroller to more efficiently perform liquidity checks.
     * @param account Address of the account to snapshot
     * @return (possible error, token balance, borrow balance, exchange rate mantissa)
     */
    function getAccountSnapshot(address account)
        external
        view
        returns (
            uint256,
            uint256,
            uint256,
            uint256
        )
    {
        uint256 jTokenBalance = getJTokenBalanceInternal(account);
        uint256 borrowBalance = borrowBalanceStoredInternal(account);
        uint256 exchangeRateMantissa = exchangeRateStoredInternal();

        return (uint256(Error.NO_ERROR), jTokenBalance, borrowBalance, exchangeRateMantissa);
    }

    /**
     * @dev Function to simply retrieve block timestamp
     *  This exists mainly for inheriting test contracts to stub this result.
     */
    function getBlockTimestamp() internal view returns (uint256) {
        return block.timestamp;
    }

    /**
     * @notice Returns the current per-sec borrow interest rate for this jToken
     * @return The borrow interest rate per sec, scaled by 1e18
     */
    function borrowRatePerSecond() external view returns (uint256) {
        return interestRateModel.getBorrowRate(getCashPrior(), totalBorrows, totalReserves);
    }

    /**
     * @notice Returns the current per-sec supply interest rate for this jToken
     * @return The supply interest rate per sec, scaled by 1e18
     */
    function supplyRatePerSecond() external view returns (uint256) {
        return interestRateModel.getSupplyRate(getCashPrior(), totalBorrows, totalReserves, reserveFactorMantissa);
    }

    /**
     * @notice Returns the estimated per-sec borrow interest rate for this jToken after some change
     * @return The borrow interest rate per sec, scaled by 1e18
     */
    function estimateBorrowRatePerSecondAfterChange(uint256 change, bool repay) external view returns (uint256) {
        uint256 cashPriorNew;
        uint256 totalBorrowsNew;

        if (repay) {
            cashPriorNew = add_(getCashPrior(), change);
            totalBorrowsNew = sub_(totalBorrows, change);
        } else {
            cashPriorNew = sub_(getCashPrior(), change);
            totalBorrowsNew = add_(totalBorrows, change);
        }
        return interestRateModel.getBorrowRate(cashPriorNew, totalBorrowsNew, totalReserves);
    }

    /**
     * @notice Returns the estimated per-sec supply interest rate for this jToken after some change
     * @return The supply interest rate per sec, scaled by 1e18
     */
    function estimateSupplyRatePerSecondAfterChange(uint256 change, bool repay) external view returns (uint256) {
        uint256 cashPriorNew;
        uint256 totalBorrowsNew;

        if (repay) {
            cashPriorNew = add_(getCashPrior(), change);
            totalBorrowsNew = sub_(totalBorrows, change);
        } else {
            cashPriorNew = sub_(getCashPrior(), change);
            totalBorrowsNew = add_(totalBorrows, change);
        }

        return interestRateModel.getSupplyRate(cashPriorNew, totalBorrowsNew, totalReserves, reserveFactorMantissa);
    }

    /**
     * @notice Returns the current total borrows plus accrued interest
     * @return The total borrows with interest
     */
    function totalBorrowsCurrent() external nonReentrant returns (uint256) {
        require(accrueInterest() == uint256(Error.NO_ERROR), "accrue interest failed");
        return totalBorrows;
    }

    /**
     * @notice Accrue interest to updated borrowIndex and then calculate account's borrow balance using the updated borrowIndex
     * @param account The address whose balance should be calculated after updating borrowIndex
     * @return The calculated balance
     */
    function borrowBalanceCurrent(address account) external nonReentrant returns (uint256) {
        require(accrueInterest() == uint256(Error.NO_ERROR), "accrue interest failed");
        return borrowBalanceStored(account);
    }

    /**
     * @notice Return the borrow balance of account based on stored data
     * @param account The address whose balance should be calculated
     * @return The calculated balance
     */
    function borrowBalanceStored(address account) public view returns (uint256) {
        return borrowBalanceStoredInternal(account);
    }

    /**
     * @notice Return the borrow balance of account based on stored data
     * @param account The address whose balance should be calculated
     * @return the calculated balance or 0 if error code is non-zero
     */
    function borrowBalanceStoredInternal(address account) internal view returns (uint256) {
        /* Get borrowBalance and borrowIndex */
        BorrowSnapshot storage borrowSnapshot = accountBorrows[account];

        /* If borrowBalance = 0 then borrowIndex is likely also 0.
         * Rather than failing the calculation with a division by 0, we immediately return 0 in this case.
         */
        if (borrowSnapshot.principal == 0) {
            return 0;
        }

        /* Calculate new borrow balance using the interest index:
         *  recentBorrowBalance = borrower.borrowBalance * market.borrowIndex / borrower.borrowIndex
         */
        uint256 principalTimesIndex = mul_(borrowSnapshot.principal, borrowIndex);
        uint256 result = div_(principalTimesIndex, borrowSnapshot.interestIndex);
        return result;
    }

    /**
     * @notice Accrue interest then return the up-to-date exchange rate
     * @return Calculated exchange rate scaled by 1e18
     */
    function exchangeRateCurrent() public nonReentrant returns (uint256) {
        require(accrueInterest() == uint256(Error.NO_ERROR), "accrue interest failed");
        return exchangeRateStored();
    }

    /**
     * @notice Calculates the exchange rate from the underlying to the JToken
     * @dev This function does not accrue interest before calculating the exchange rate
     * @return Calculated exchange rate scaled by 1e18
     */
    function exchangeRateStored() public view returns (uint256) {
        return exchangeRateStoredInternal();
    }

    /**
     * @notice Calculates the exchange rate from the underlying to the JToken
     * @dev This function does not accrue interest before calculating the exchange rate
     * @return calculated exchange rate scaled by 1e18
     */
    function exchangeRateStoredInternal() internal view returns (uint256) {
        uint256 _totalSupply = totalSupply;
        if (_totalSupply == 0) {
            /*
             * If there are no tokens minted:
             *  exchangeRate = initialExchangeRate
             */
            return initialExchangeRateMantissa;
        } else {
            /*
             * Otherwise:
             *  exchangeRate = (totalCash + totalBorrows - totalReserves) / totalSupply
             */
            uint256 totalCash = getCashPrior();
            uint256 cashPlusBorrowsMinusReserves = sub_(add_(totalCash, totalBorrows), totalReserves);
            uint256 exchangeRate = div_(cashPlusBorrowsMinusReserves, Exp({mantissa: _totalSupply}));
            return exchangeRate;
        }
    }

    /**
     * @notice Get cash balance of this jToken in the underlying asset
     * @return The quantity of underlying asset owned by this contract
     */
    function getCash() external view returns (uint256) {
        return getCashPrior();
    }

    /**
     * @notice Applies accrued interest to total borrows and reserves
     * @dev This calculates interest accrued from the last checkpointed timestamp
     *   up to the current timestamp and writes new checkpoint to storage.
     */
    function accrueInterest() public returns (uint256) {
        /* Remember the initial block timestamp */
        uint256 currentBlockTimestamp = getBlockTimestamp();
        uint256 accrualBlockTimestampPrior = accrualBlockTimestamp;

        /* Short-circuit accumulating 0 interest */
        if (accrualBlockTimestampPrior == currentBlockTimestamp) {
            return uint256(Error.NO_ERROR);
        }

        /* Read the previous values out of storage */
        uint256 cashPrior = getCashPrior();
        uint256 borrowsPrior = totalBorrows;
        uint256 reservesPrior = totalReserves;
        uint256 borrowIndexPrior = borrowIndex;

        /* Calculate the current borrow interest rate */
        uint256 borrowRateMantissa = interestRateModel.getBorrowRate(cashPrior, borrowsPrior, reservesPrior);
        require(borrowRateMantissa <= borrowRateMaxMantissa, "borrow rate is absurdly high");

        /* Calculate the number of seconds elapsed since the last accrual */
        uint256 timestampDelta = sub_(currentBlockTimestamp, accrualBlockTimestampPrior);

        /*
         * Calculate the interest accumulated into borrows and reserves and the new index:
         *  simpleInterestFactor = borrowRate * timestampDelta
         *  interestAccumulated = simpleInterestFactor * totalBorrows
         *  totalBorrowsNew = interestAccumulated + totalBorrows
         *  totalReservesNew = interestAccumulated * reserveFactor + totalReserves
         *  borrowIndexNew = simpleInterestFactor * borrowIndex + borrowIndex
         */

        Exp memory simpleInterestFactor = mul_(Exp({mantissa: borrowRateMantissa}), timestampDelta);
        uint256 interestAccumulated = mul_ScalarTruncate(simpleInterestFactor, borrowsPrior);
        uint256 totalBorrowsNew = add_(interestAccumulated, borrowsPrior);
        uint256 totalReservesNew = mul_ScalarTruncateAddUInt(
            Exp({mantissa: reserveFactorMantissa}),
            interestAccumulated,
            reservesPrior
        );
        uint256 borrowIndexNew = mul_ScalarTruncateAddUInt(simpleInterestFactor, borrowIndexPrior, borrowIndexPrior);

        /////////////////////////
        // EFFECTS & INTERACTIONS
        // (No safe failures beyond this point)

        /* We write the previously calculated values into storage */
        accrualBlockTimestamp = currentBlockTimestamp;
        borrowIndex = borrowIndexNew;
        totalBorrows = totalBorrowsNew;
        totalReserves = totalReservesNew;

        /* We emit an AccrueInterest event */
        emit AccrueInterest(cashPrior, interestAccumulated, borrowIndexNew, totalBorrowsNew);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Sender supplies assets into the market and receives jTokens in exchange
     * @dev Accrues interest whether or not the operation succeeds, unless reverted
     * @param mintAmount The amount of the underlying asset to supply
     * @param isNative The amount is in native or not
     * @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual mint amount.
     */
    function mintInternal(uint256 mintAmount, bool isNative) internal nonReentrant returns (uint256, uint256) {
        uint256 error = accrueInterest();
        if (error != uint256(Error.NO_ERROR)) {
            // accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed
            return (fail(Error(error), FailureInfo.MINT_ACCRUE_INTEREST_FAILED), 0);
        }
        // mintFresh emits the actual Mint event if successful and logs on errors, so we don't need to
        return mintFresh(msg.sender, mintAmount, isNative);
    }

    /**
     * @notice Sender redeems jTokens in exchange for the underlying asset
     * @dev Accrues interest whether or not the operation succeeds, unless reverted
     * @param redeemTokens The number of jTokens to redeem into underlying
     * @param isNative The amount is in native or not
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function redeemInternal(uint256 redeemTokens, bool isNative) internal nonReentrant returns (uint256) {
        uint256 error = accrueInterest();
        if (error != uint256(Error.NO_ERROR)) {
            // accrueInterest emits logs on errors, but we still want to log the fact that an attempted redeem failed
            return fail(Error(error), FailureInfo.REDEEM_ACCRUE_INTEREST_FAILED);
        }
        // redeemFresh emits redeem-specific logs on errors, so we don't need to
        return redeemFresh(msg.sender, redeemTokens, 0, isNative);
    }

    /**
     * @notice Sender redeems jTokens in exchange for a specified amount of underlying asset
     * @dev Accrues interest whether or not the operation succeeds, unless reverted
     * @param redeemAmount The amount of underlying to receive from redeeming jTokens
     * @param isNative The amount is in native or not
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function redeemUnderlyingInternal(uint256 redeemAmount, bool isNative) internal nonReentrant returns (uint256) {
        uint256 error = accrueInterest();
        if (error != uint256(Error.NO_ERROR)) {
            // accrueInterest emits logs on errors, but we still want to log the fact that an attempted redeem failed
            return fail(Error(error), FailureInfo.REDEEM_ACCRUE_INTEREST_FAILED);
        }
        // redeemFresh emits redeem-specific logs on errors, so we don't need to
        return redeemFresh(msg.sender, 0, redeemAmount, isNative);
    }

    /**
     * @notice Sender borrows assets from the protocol to their own address
     * @param borrowAmount The amount of the underlying asset to borrow
     * @param isNative The amount is in native or not
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function borrowInternal(uint256 borrowAmount, bool isNative) internal nonReentrant returns (uint256) {
        uint256 error = accrueInterest();
        if (error != uint256(Error.NO_ERROR)) {
            // accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed
            return fail(Error(error), FailureInfo.BORROW_ACCRUE_INTEREST_FAILED);
        }
        // borrowFresh emits borrow-specific logs on errors, so we don't need to
        return borrowFresh(msg.sender, borrowAmount, isNative);
    }

    struct BorrowLocalVars {
        MathError mathErr;
        uint256 accountBorrows;
        uint256 accountBorrowsNew;
        uint256 totalBorrowsNew;
    }

    /**
     * @notice Users borrow assets from the protocol to their own address
     * @param borrowAmount The amount of the underlying asset to borrow
     * @param isNative The amount is in native or not
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function borrowFresh(
        address payable borrower,
        uint256 borrowAmount,
        bool isNative
    ) internal returns (uint256) {
        /* Fail if borrow not allowed */
        uint256 allowed = joetroller.borrowAllowed(address(this), borrower, borrowAmount);
        if (allowed != 0) {
            return failOpaque(Error.JOETROLLER_REJECTION, FailureInfo.BORROW_JOETROLLER_REJECTION, allowed);
        }

        /*
         * Return if borrowAmount is zero.
         * Put behind `borrowAllowed` for accuring potential JOE rewards.
         */
        if (borrowAmount == 0) {
            accountBorrows[borrower].principal = borrowBalanceStoredInternal(borrower);
            accountBorrows[borrower].interestIndex = borrowIndex;
            return uint256(Error.NO_ERROR);
        }

        /* Verify market's block timestamp equals current block timestamp */
        if (accrualBlockTimestamp != getBlockTimestamp()) {
            return fail(Error.MARKET_NOT_FRESH, FailureInfo.BORROW_FRESHNESS_CHECK);
        }

        /* Fail gracefully if protocol has insufficient underlying cash */
        if (getCashPrior() < borrowAmount) {
            return fail(Error.TOKEN_INSUFFICIENT_CASH, FailureInfo.BORROW_CASH_NOT_AVAILABLE);
        }

        BorrowLocalVars memory vars;

        /*
         * We calculate the new borrower and total borrow balances, failing on overflow:
         *  accountBorrowsNew = accountBorrows + borrowAmount
         *  totalBorrowsNew = totalBorrows + borrowAmount
         */
        vars.accountBorrows = borrowBalanceStoredInternal(borrower);
        vars.accountBorrowsNew = add_(vars.accountBorrows, borrowAmount);
        vars.totalBorrowsNew = add_(totalBorrows, borrowAmount);

        /////////////////////////
        // EFFECTS & INTERACTIONS
        // (No safe failures beyond this point)

        /*
         * We invoke doTransferOut for the borrower and the borrowAmount.
         *  Note: The jToken must handle variations between ERC-20 and ETH underlying.
         *  On success, the jToken borrowAmount less of cash.
         *  doTransferOut reverts if anything goes wrong, since we can't be sure if side effects occurred.
         */
        doTransferOut(borrower, borrowAmount, isNative);

        /* We write the previously calculated values into storage */
        accountBorrows[borrower].principal = vars.accountBorrowsNew;
        accountBorrows[borrower].interestIndex = borrowIndex;
        totalBorrows = vars.totalBorrowsNew;

        /* We emit a Borrow event */
        emit Borrow(borrower, borrowAmount, vars.accountBorrowsNew, vars.totalBorrowsNew);

        /* We call the defense hook */
        // unused function
        // joetroller.borrowVerify(address(this), borrower, borrowAmount);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Sender repays their own borrow
     * @param repayAmount The amount to repay
     * @param isNative The amount is in native or not
     * @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual repayment amount.
     */
    function repayBorrowInternal(uint256 repayAmount, bool isNative) internal nonReentrant returns (uint256, uint256) {
        uint256 error = accrueInterest();
        if (error != uint256(Error.NO_ERROR)) {
            // accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed
            return (fail(Error(error), FailureInfo.REPAY_BORROW_ACCRUE_INTEREST_FAILED), 0);
        }
        // repayBorrowFresh emits repay-borrow-specific logs on errors, so we don't need to
        return repayBorrowFresh(msg.sender, msg.sender, repayAmount, isNative);
    }

    /**
     * @notice Sender repays a borrow belonging to borrower
     * @param borrower the account with the debt being payed off
     * @param repayAmount The amount to repay
     * @param isNative The amount is in native or not
     * @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual repayment amount.
     */
    function repayBorrowBehalfInternal(
        address borrower,
        uint256 repayAmount,
        bool isNative
    ) internal nonReentrant returns (uint256, uint256) {
        uint256 error = accrueInterest();
        if (error != uint256(Error.NO_ERROR)) {
            // accrueInterest emits logs on errors, but we still want to log the fact that an attempted borrow failed
            return (fail(Error(error), FailureInfo.REPAY_BEHALF_ACCRUE_INTEREST_FAILED), 0);
        }
        // repayBorrowFresh emits repay-borrow-specific logs on errors, so we don't need to
        return repayBorrowFresh(msg.sender, borrower, repayAmount, isNative);
    }

    struct RepayBorrowLocalVars {
        Error err;
        MathError mathErr;
        uint256 repayAmount;
        uint256 borrowerIndex;
        uint256 accountBorrows;
        uint256 accountBorrowsNew;
        uint256 totalBorrowsNew;
        uint256 actualRepayAmount;
    }

    /**
     * @notice Borrows are repaid by another user (possibly the borrower).
     * @param payer the account paying off the borrow
     * @param borrower the account with the debt being payed off
     * @param repayAmount the amount of undelrying tokens being returned
     * @param isNative The amount is in native or not
     * @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual repayment amount.
     */
    function repayBorrowFresh(
        address payer,
        address borrower,
        uint256 repayAmount,
        bool isNative
    ) internal returns (uint256, uint256) {
        /* Fail if repayBorrow not allowed */
        uint256 allowed = joetroller.repayBorrowAllowed(address(this), payer, borrower, repayAmount);
        if (allowed != 0) {
            return (failOpaque(Error.JOETROLLER_REJECTION, FailureInfo.REPAY_BORROW_JOETROLLER_REJECTION, allowed), 0);
        }

        /*
         * Return if repayAmount is zero.
         * Put behind `repayBorrowAllowed` for accuring potential JOE rewards.
         */
        if (repayAmount == 0) {
            accountBorrows[borrower].principal = borrowBalanceStoredInternal(borrower);
            accountBorrows[borrower].interestIndex = borrowIndex;
            return (uint256(Error.NO_ERROR), 0);
        }

        /* Verify market's block timestamp equals current block timestamp */
        if (accrualBlockTimestamp != getBlockTimestamp()) {
            return (fail(Error.MARKET_NOT_FRESH, FailureInfo.REPAY_BORROW_FRESHNESS_CHECK), 0);
        }

        RepayBorrowLocalVars memory vars;

        /* We remember the original borrowerIndex for verification purposes */
        vars.borrowerIndex = accountBorrows[borrower].interestIndex;

        /* We fetch the amount the borrower owes, with accumulated interest */
        vars.accountBorrows = borrowBalanceStoredInternal(borrower);

        /* If repayAmount == -1, repayAmount = accountBorrows */
        if (repayAmount == uint256(-1)) {
            vars.repayAmount = vars.accountBorrows;
        } else {
            vars.repayAmount = repayAmount;
        }

        /////////////////////////
        // EFFECTS & INTERACTIONS
        // (No safe failures beyond this point)

        /*
         * We call doTransferIn for the payer and the repayAmount
         *  Note: The jToken must handle variations between ERC-20 and ETH underlying.
         *  On success, the jToken holds an additional repayAmount of cash.
         *  doTransferIn reverts if anything goes wrong, since we can't be sure if side effects occurred.
         *   it returns the amount actually transferred, in case of a fee.
         */
        vars.actualRepayAmount = doTransferIn(payer, vars.repayAmount, isNative);

        /*
         * We calculate the new borrower and total borrow balances, failing on underflow:
         *  accountBorrowsNew = accountBorrows - actualRepayAmount
         *  totalBorrowsNew = totalBorrows - actualRepayAmount
         */
        vars.accountBorrowsNew = sub_(vars.accountBorrows, vars.actualRepayAmount);
        vars.totalBorrowsNew = sub_(totalBorrows, vars.actualRepayAmount);

        /* We write the previously calculated values into storage */
        accountBorrows[borrower].principal = vars.accountBorrowsNew;
        accountBorrows[borrower].interestIndex = borrowIndex;
        totalBorrows = vars.totalBorrowsNew;

        /* We emit a RepayBorrow event */
        emit RepayBorrow(payer, borrower, vars.actualRepayAmount, vars.accountBorrowsNew, vars.totalBorrowsNew);

        /* We call the defense hook */
        // unused function
        // joetroller.repayBorrowVerify(address(this), payer, borrower, vars.actualRepayAmount, vars.borrowerIndex);

        return (uint256(Error.NO_ERROR), vars.actualRepayAmount);
    }

    /**
     * @notice The sender liquidates the borrowers collateral.
     *  The collateral seized is transferred to the liquidator.
     * @param borrower The borrower of this jToken to be liquidated
     * @param repayAmount The amount of the underlying borrowed asset to repay
     * @param jTokenCollateral The market in which to seize collateral from the borrower
     * @param isNative The amount is in native or not
     * @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual repayment amount.
     */
    function liquidateBorrowInternal(
        address borrower,
        uint256 repayAmount,
        JTokenInterface jTokenCollateral,
        bool isNative
    ) internal nonReentrant returns (uint256, uint256) {
        uint256 error = accrueInterest();
        if (error != uint256(Error.NO_ERROR)) {
            // accrueInterest emits logs on errors, but we still want to log the fact that an attempted liquidation failed
            return (fail(Error(error), FailureInfo.LIQUIDATE_ACCRUE_BORROW_INTEREST_FAILED), 0);
        }

        error = jTokenCollateral.accrueInterest();
        if (error != uint256(Error.NO_ERROR)) {
            // accrueInterest emits logs on errors, but we still want to log the fact that an attempted liquidation failed
            return (fail(Error(error), FailureInfo.LIQUIDATE_ACCRUE_COLLATERAL_INTEREST_FAILED), 0);
        }

        // liquidateBorrowFresh emits borrow-specific logs on errors, so we don't need to
        return liquidateBorrowFresh(msg.sender, borrower, repayAmount, jTokenCollateral, isNative);
    }

    /**
     * @notice The liquidator liquidates the borrowers collateral.
     *  The collateral seized is transferred to the liquidator.
     * @param borrower The borrower of this jToken to be liquidated
     * @param liquidator The address repaying the borrow and seizing collateral
     * @param jTokenCollateral The market in which to seize collateral from the borrower
     * @param repayAmount The amount of the underlying borrowed asset to repay
     * @param isNative The amount is in native or not
     * @return (uint, uint) An error code (0=success, otherwise a failure, see ErrorReporter.sol), and the actual repayment amount.
     */
    function liquidateBorrowFresh(
        address liquidator,
        address borrower,
        uint256 repayAmount,
        JTokenInterface jTokenCollateral,
        bool isNative
    ) internal returns (uint256, uint256) {
        /* Fail if liquidate not allowed */
        uint256 allowed = joetroller.liquidateBorrowAllowed(
            address(this),
            address(jTokenCollateral),
            liquidator,
            borrower,
            repayAmount
        );
        if (allowed != 0) {
            return (failOpaque(Error.JOETROLLER_REJECTION, FailureInfo.LIQUIDATE_JOETROLLER_REJECTION, allowed), 0);
        }

        /* Verify market's block timestamp equals current block timestamp */
        if (accrualBlockTimestamp != getBlockTimestamp()) {
            return (fail(Error.MARKET_NOT_FRESH, FailureInfo.LIQUIDATE_FRESHNESS_CHECK), 0);
        }

        /* Verify jTokenCollateral market's block timestamp equals current block timestamp */
        if (jTokenCollateral.accrualBlockTimestamp() != getBlockTimestamp()) {
            return (fail(Error.MARKET_NOT_FRESH, FailureInfo.LIQUIDATE_COLLATERAL_FRESHNESS_CHECK), 0);
        }

        /* Fail if borrower = liquidator */
        if (borrower == liquidator) {
            return (fail(Error.INVALID_ACCOUNT_PAIR, FailureInfo.LIQUIDATE_LIQUIDATOR_IS_BORROWER), 0);
        }

        /* Fail if repayAmount = 0 */
        if (repayAmount == 0) {
            return (fail(Error.INVALID_CLOSE_AMOUNT_REQUESTED, FailureInfo.LIQUIDATE_CLOSE_AMOUNT_IS_ZERO), 0);
        }

        /* Fail if repayAmount = -1 */
        if (repayAmount == uint256(-1)) {
            return (fail(Error.INVALID_CLOSE_AMOUNT_REQUESTED, FailureInfo.LIQUIDATE_CLOSE_AMOUNT_IS_UINT_MAX), 0);
        }

        /* Fail if repayBorrow fails */
        (uint256 repayBorrowError, uint256 actualRepayAmount) = repayBorrowFresh(
            liquidator,
            borrower,
            repayAmount,
            isNative
        );
        if (repayBorrowError != uint256(Error.NO_ERROR)) {
            return (fail(Error(repayBorrowError), FailureInfo.LIQUIDATE_REPAY_BORROW_FRESH_FAILED), 0);
        }

        /////////////////////////
        // EFFECTS & INTERACTIONS
        // (No safe failures beyond this point)

        /* We calculate the number of collateral tokens that will be seized */
        (uint256 amountSeizeError, uint256 seizeTokens) = joetroller.liquidateCalculateSeizeTokens(
            address(this),
            address(jTokenCollateral),
            actualRepayAmount
        );
        require(amountSeizeError == uint256(Error.NO_ERROR), "LIQUIDATE_JOETROLLER_CALCULATE_AMOUNT_SEIZE_FAILED");

        /* Revert if borrower collateral token balance < seizeTokens */
        require(jTokenCollateral.balanceOf(borrower) >= seizeTokens, "LIQUIDATE_SEIZE_TOO_MUCH");

        // If this is also the collateral, run seizeInternal to avoid re-entrancy, otherwise make an external call
        uint256 seizeError;
        if (address(jTokenCollateral) == address(this)) {
            seizeError = seizeInternal(address(this), liquidator, borrower, seizeTokens);
        } else {
            seizeError = jTokenCollateral.seize(liquidator, borrower, seizeTokens);
        }

        /* Revert if seize tokens fails (since we cannot be sure of side effects) */
        require(seizeError == uint256(Error.NO_ERROR), "token seizure failed");

        /* We emit a LiquidateBorrow event */
        emit LiquidateBorrow(liquidator, borrower, actualRepayAmount, address(jTokenCollateral), seizeTokens);

        /* We call the defense hook */
        // unused function
        // joetroller.liquidateBorrowVerify(address(this), address(jTokenCollateral), liquidator, borrower, actualRepayAmount, seizeTokens);

        return (uint256(Error.NO_ERROR), actualRepayAmount);
    }

    /**
     * @notice Transfers collateral tokens (this market) to the liquidator.
     * @dev Will fail unless called by another jToken during the process of liquidation.
     *  Its absolutely critical to use msg.sender as the borrowed jToken and not a parameter.
     * @param liquidator The account receiving seized collateral
     * @param borrower The account having collateral seized
     * @param seizeTokens The number of jTokens to seize
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function seize(
        address liquidator,
        address borrower,
        uint256 seizeTokens
    ) external nonReentrant returns (uint256) {
        return seizeInternal(msg.sender, liquidator, borrower, seizeTokens);
    }

    /*** Admin Functions ***/

    /**
     * @notice Begins transfer of admin rights. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer.
     * @dev Admin function to begin change of admin. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer.
     * @param newPendingAdmin New pending admin.
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _setPendingAdmin(address payable newPendingAdmin) external returns (uint256) {
        // Check caller = admin
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_PENDING_ADMIN_OWNER_CHECK);
        }

        // Save current value, if any, for inclusion in log
        address oldPendingAdmin = pendingAdmin;

        // Store pendingAdmin with value newPendingAdmin
        pendingAdmin = newPendingAdmin;

        // Emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin)
        emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Accepts transfer of admin rights. msg.sender must be pendingAdmin
     * @dev Admin function for pending admin to accept role and update admin
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _acceptAdmin() external returns (uint256) {
        // Check caller is pendingAdmin and pendingAdmin ≠ address(0)
        if (msg.sender != pendingAdmin || msg.sender == address(0)) {
            return fail(Error.UNAUTHORIZED, FailureInfo.ACCEPT_ADMIN_PENDING_ADMIN_CHECK);
        }

        // Save current values for inclusion in log
        address oldAdmin = admin;
        address oldPendingAdmin = pendingAdmin;

        // Store admin with value pendingAdmin
        admin = pendingAdmin;

        // Clear the pending value
        pendingAdmin = address(0);

        emit NewAdmin(oldAdmin, admin);
        emit NewPendingAdmin(oldPendingAdmin, pendingAdmin);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Sets a new joetroller for the market
     * @dev Admin function to set a new joetroller
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _setJoetroller(JoetrollerInterface newJoetroller) public returns (uint256) {
        // Check caller is admin
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_JOETROLLER_OWNER_CHECK);
        }

        JoetrollerInterface oldJoetroller = joetroller;
        // Ensure invoke joetroller.isJoetroller() returns true
        require(newJoetroller.isJoetroller(), "marker method returned false");

        // Set market's joetroller to newJoetroller
        joetroller = newJoetroller;

        // Emit NewJoetroller(oldJoetroller, newJoetroller)
        emit NewJoetroller(oldJoetroller, newJoetroller);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Accrues interest and sets a new reserve factor for the protocol using _setReserveFactorFresh
     * @dev Admin function to accrue interest and set a new reserve factor
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _setReserveFactor(uint256 newReserveFactorMantissa) external nonReentrant returns (uint256) {
        uint256 error = accrueInterest();
        if (error != uint256(Error.NO_ERROR)) {
            // accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted reserve factor change failed.
            return fail(Error(error), FailureInfo.SET_RESERVE_FACTOR_ACCRUE_INTEREST_FAILED);
        }
        // _setReserveFactorFresh emits reserve-factor-specific logs on errors, so we don't need to.
        return _setReserveFactorFresh(newReserveFactorMantissa);
    }

    /**
     * @notice Sets a new reserve factor for the protocol (*requires fresh interest accrual)
     * @dev Admin function to set a new reserve factor
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _setReserveFactorFresh(uint256 newReserveFactorMantissa) internal returns (uint256) {
        // Check caller is admin
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_RESERVE_FACTOR_ADMIN_CHECK);
        }

        // Verify market's block timestamp equals current block timestamp
        if (accrualBlockTimestamp != getBlockTimestamp()) {
            return fail(Error.MARKET_NOT_FRESH, FailureInfo.SET_RESERVE_FACTOR_FRESH_CHECK);
        }

        // Check newReserveFactor ≤ maxReserveFactor
        if (newReserveFactorMantissa > reserveFactorMaxMantissa) {
            return fail(Error.BAD_INPUT, FailureInfo.SET_RESERVE_FACTOR_BOUNDS_CHECK);
        }

        uint256 oldReserveFactorMantissa = reserveFactorMantissa;
        reserveFactorMantissa = newReserveFactorMantissa;

        emit NewReserveFactor(oldReserveFactorMantissa, newReserveFactorMantissa);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Accrues interest and reduces reserves by transferring from msg.sender
     * @param addAmount Amount of addition to reserves
     * @param isNative The amount is in native or not
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _addReservesInternal(uint256 addAmount, bool isNative) internal nonReentrant returns (uint256) {
        uint256 error = accrueInterest();
        if (error != uint256(Error.NO_ERROR)) {
            // accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted reduce reserves failed.
            return fail(Error(error), FailureInfo.ADD_RESERVES_ACCRUE_INTEREST_FAILED);
        }

        // _addReservesFresh emits reserve-addition-specific logs on errors, so we don't need to.
        (error, ) = _addReservesFresh(addAmount, isNative);
        return error;
    }

    /**
     * @notice Add reserves by transferring from caller
     * @dev Requires fresh interest accrual
     * @param addAmount Amount of addition to reserves
     * @param isNative The amount is in native or not
     * @return (uint, uint) An error code (0=success, otherwise a failure (see ErrorReporter.sol for details)) and the actual amount added, net token fees
     */
    function _addReservesFresh(uint256 addAmount, bool isNative) internal returns (uint256, uint256) {
        // totalReserves + actualAddAmount
        uint256 totalReservesNew;
        uint256 actualAddAmount;

        // We fail gracefully unless market's block timestamp equals current block timestamp
        if (accrualBlockTimestamp != getBlockTimestamp()) {
            return (fail(Error.MARKET_NOT_FRESH, FailureInfo.ADD_RESERVES_FRESH_CHECK), actualAddAmount);
        }

        /////////////////////////
        // EFFECTS & INTERACTIONS
        // (No safe failures beyond this point)

        /*
         * We call doTransferIn for the caller and the addAmount
         *  Note: The jToken must handle variations between ERC-20 and ETH underlying.
         *  On success, the jToken holds an additional addAmount of cash.
         *  doTransferIn reverts if anything goes wrong, since we can't be sure if side effects occurred.
         *  it returns the amount actually transferred, in case of a fee.
         */

        actualAddAmount = doTransferIn(msg.sender, addAmount, isNative);

        totalReservesNew = add_(totalReserves, actualAddAmount);

        // Store reserves[n+1] = reserves[n] + actualAddAmount
        totalReserves = totalReservesNew;

        /* Emit NewReserves(admin, actualAddAmount, reserves[n+1]) */
        emit ReservesAdded(msg.sender, actualAddAmount, totalReservesNew);

        /* Return (NO_ERROR, actualAddAmount) */
        return (uint256(Error.NO_ERROR), actualAddAmount);
    }

    /**
     * @notice Accrues interest and reduces reserves by transferring to admin
     * @param reduceAmount Amount of reduction to reserves
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _reduceReserves(uint256 reduceAmount) external nonReentrant returns (uint256) {
        uint256 error = accrueInterest();
        if (error != uint256(Error.NO_ERROR)) {
            // accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted reduce reserves failed.
            return fail(Error(error), FailureInfo.REDUCE_RESERVES_ACCRUE_INTEREST_FAILED);
        }
        // _reduceReservesFresh emits reserve-reduction-specific logs on errors, so we don't need to.
        return _reduceReservesFresh(reduceAmount);
    }

    /**
     * @notice Reduces reserves by transferring to admin
     * @dev Requires fresh interest accrual
     * @param reduceAmount Amount of reduction to reserves
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _reduceReservesFresh(uint256 reduceAmount) internal returns (uint256) {
        // totalReserves - reduceAmount
        uint256 totalReservesNew;

        // Check caller is admin
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.REDUCE_RESERVES_ADMIN_CHECK);
        }

        // We fail gracefully unless market's block timestamp equals current block timestamp
        if (accrualBlockTimestamp != getBlockTimestamp()) {
            return fail(Error.MARKET_NOT_FRESH, FailureInfo.REDUCE_RESERVES_FRESH_CHECK);
        }

        // Fail gracefully if protocol has insufficient underlying cash
        if (getCashPrior() < reduceAmount) {
            return fail(Error.TOKEN_INSUFFICIENT_CASH, FailureInfo.REDUCE_RESERVES_CASH_NOT_AVAILABLE);
        }

        // Check reduceAmount ≤ reserves[n] (totalReserves)
        if (reduceAmount > totalReserves) {
            return fail(Error.BAD_INPUT, FailureInfo.REDUCE_RESERVES_VALIDATION);
        }

        /////////////////////////
        // EFFECTS & INTERACTIONS
        // (No safe failures beyond this point)

        totalReservesNew = sub_(totalReserves, reduceAmount);

        // Store reserves[n+1] = reserves[n] - reduceAmount
        totalReserves = totalReservesNew;

        // doTransferOut reverts if anything goes wrong, since we can't be sure if side effects occurred.
        // Restrict reducing reserves in native token. Implementations except `JWrappedNative` won't use parameter `isNative`.
        doTransferOut(admin, reduceAmount, true);

        emit ReservesReduced(admin, reduceAmount, totalReservesNew);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice accrues interest and updates the interest rate model using _setInterestRateModelFresh
     * @dev Admin function to accrue interest and update the interest rate model
     * @param newInterestRateModel the new interest rate model to use
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _setInterestRateModel(InterestRateModel newInterestRateModel) public returns (uint256) {
        uint256 error = accrueInterest();
        if (error != uint256(Error.NO_ERROR)) {
            // accrueInterest emits logs on errors, but on top of that we want to log the fact that an attempted change of interest rate model failed
            return fail(Error(error), FailureInfo.SET_INTEREST_RATE_MODEL_ACCRUE_INTEREST_FAILED);
        }
        // _setInterestRateModelFresh emits interest-rate-model-update-specific logs on errors, so we don't need to.
        return _setInterestRateModelFresh(newInterestRateModel);
    }

    /**
     * @notice updates the interest rate model (*requires fresh interest accrual)
     * @dev Admin function to update the interest rate model
     * @param newInterestRateModel the new interest rate model to use
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _setInterestRateModelFresh(InterestRateModel newInterestRateModel) internal returns (uint256) {
        // Used to store old model for use in the event that is emitted on success
        InterestRateModel oldInterestRateModel;

        // Check caller is admin
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_INTEREST_RATE_MODEL_OWNER_CHECK);
        }

        // We fail gracefully unless market's block timestamp equals current block timestamp
        if (accrualBlockTimestamp != getBlockTimestamp()) {
            return fail(Error.MARKET_NOT_FRESH, FailureInfo.SET_INTEREST_RATE_MODEL_FRESH_CHECK);
        }

        // Track the market's current interest rate model
        oldInterestRateModel = interestRateModel;

        // Ensure invoke newInterestRateModel.isInterestRateModel() returns true
        require(newInterestRateModel.isInterestRateModel(), "marker method returned false");

        // Set the interest rate model to newInterestRateModel
        interestRateModel = newInterestRateModel;

        // Emit NewMarketInterestRateModel(oldInterestRateModel, newInterestRateModel)
        emit NewMarketInterestRateModel(oldInterestRateModel, newInterestRateModel);

        return uint256(Error.NO_ERROR);
    }

    /*** Safe Token ***/

    /**
     * @notice Gets balance of this contract in terms of the underlying
     * @dev This excludes the value of the current message, if any
     * @return The quantity of underlying owned by this contract
     */
    function getCashPrior() internal view returns (uint256);

    /**
     * @dev Performs a transfer in, reverting upon failure. Returns the amount actually transferred to the protocol, in case of a fee.
     *  This may revert due to insufficient balance or insufficient allowance.
     */
    function doTransferIn(
        address from,
        uint256 amount,
        bool isNative
    ) internal returns (uint256);

    /**
     * @dev Performs a transfer out, ideally returning an explanatory error code upon failure tather than reverting.
     *  If caller has not called checked protocol's balance, may revert due to insufficient cash held in the contract.
     *  If caller has checked protocol's balance, and verified it is >= amount, this should not revert in normal conditions.
     */
    function doTransferOut(
        address payable to,
        uint256 amount,
        bool isNative
    ) internal;

    /**
     * @notice Transfer `tokens` tokens from `src` to `dst` by `spender`
     * @dev Called by both `transfer` and `transferFrom` internally
     */
    function transferTokens(
        address spender,
        address src,
        address dst,
        uint256 tokens
    ) internal returns (uint256);

    /**
     * @notice Get the account's jToken balances
     */
    function getJTokenBalanceInternal(address account) internal view returns (uint256);

    /**
     * @notice User supplies assets into the market and receives jTokens in exchange
     * @dev Assumes interest has already been accrued up to the current timestamp
     */
    function mintFresh(
        address minter,
        uint256 mintAmount,
        bool isNative
    ) internal returns (uint256, uint256);

    /**
     * @notice User redeems jTokens in exchange for the underlying asset
     * @dev Assumes interest has already been accrued up to the current timestamp
     */
    function redeemFresh(
        address payable redeemer,
        uint256 redeemTokensIn,
        uint256 redeemAmountIn,
        bool isNative
    ) internal returns (uint256);

    /**
     * @notice Transfers collateral tokens (this market) to the liquidator.
     * @dev Called only during an in-kind liquidation, or by liquidateBorrow during the liquidation of another JToken.
     *  Its absolutely critical to use msg.sender as the seizer jToken and not a parameter.
     */
    function seizeInternal(
        address seizerToken,
        address liquidator,
        address borrower,
        uint256 seizeTokens
    ) internal returns (uint256);

    /*** Reentrancy Guard ***/

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     */
    modifier nonReentrant() {
        require(_notEntered, "re-entered");
        _notEntered = false;
        _;
        _notEntered = true; // get a gas-refund post-Istanbul
    }
}



pragma experimental ABIEncoderV2;























contract RewardDistributorStorage {
    /**
     * @notice Administrator for this contract
     */
    address public admin;

    /**
     * @notice Active brains of Unitroller
     */
    Joetroller public joetroller;

    struct RewardMarketState {
        /// @notice The market's last updated joeBorrowIndex or joeSupplyIndex
        uint224 index;
        /// @notice The timestamp number the index was last updated at
        uint32 timestamp;
    }

    /// @notice The portion of supply reward rate that each market currently receives
    mapping(uint8 => mapping(address => uint256)) public rewardSupplySpeeds;

    /// @notice The portion of borrow reward rate that each market currently receives
    mapping(uint8 => mapping(address => uint256)) public rewardBorrowSpeeds;

    /// @notice The JOE/AVAX market supply state for each market
    mapping(uint8 => mapping(address => RewardMarketState)) public rewardSupplyState;

    /// @notice The JOE/AVAX market borrow state for each market
    mapping(uint8 => mapping(address => RewardMarketState)) public rewardBorrowState;

    /// @notice The JOE/AVAX borrow index for each market for each supplier as of the last time they accrued reward
    mapping(uint8 => mapping(address => mapping(address => uint256))) public rewardSupplierIndex;

    /// @notice The JOE/AVAX borrow index for each market for each borrower as of the last time they accrued reward
    mapping(uint8 => mapping(address => mapping(address => uint256))) public rewardBorrowerIndex;

    /// @notice The JOE/AVAX accrued but not yet transferred to each user
    mapping(uint8 => mapping(address => uint256)) public rewardAccrued;

    /// @notice The initial reward index for a market
    uint224 public constant rewardInitialIndex = 1e36;

    /// @notice JOE token contract address
    address public joeAddress;
}

contract RewardDistributor is RewardDistributorStorage, Exponential {
    /// @notice Emitted when a new reward supply speed is calculated for a market
    event RewardSupplySpeedUpdated(uint8 rewardType, JToken indexed jToken, uint256 newSpeed);

    /// @notice Emitted when a new reward borrow speed is calculated for a market
    event RewardBorrowSpeedUpdated(uint8 rewardType, JToken indexed jToken, uint256 newSpeed);

    /// @notice Emitted when JOE/AVAX is distributed to a supplier
    event DistributedSupplierReward(
        uint8 rewardType,
        JToken indexed jToken,
        address indexed supplier,
        uint256 rewardDelta,
        uint256 rewardSupplyIndex
    );

    /// @notice Emitted when JOE/AVAX is distributed to a borrower
    event DistributedBorrowerReward(
        uint8 rewardType,
        JToken indexed jToken,
        address indexed borrower,
        uint256 rewardDelta,
        uint256 rewardBorrowIndex
    );

    /// @notice Emitted when JOE is granted by admin
    event RewardGranted(uint8 rewardType, address recipient, uint256 amount);

    bool private initialized;

    constructor() public {
        admin = msg.sender;
    }

    function initialize() public {
        require(!initialized, "RewardDistributor already initialized");
        joetroller = Joetroller(msg.sender);
        initialized = true;
    }

    /**
     * @notice Checks caller is admin, or this contract is becoming the new implementation
     */
    function adminOrInitializing() internal view returns (bool) {
        return msg.sender == admin || msg.sender == address(joetroller);
    }

    /**
     * @notice Set JOE/AVAX speed for a single market
     * @param rewardType 0 = QI, 1 = AVAX
     * @param jToken The market whose reward speed to update
     * @param rewardSupplySpeed New reward supply speed for market
     * @param rewardBorrowSpeed New reward borrow speed for market
     */
    function _setRewardSpeed(
        uint8 rewardType,
        JToken jToken,
        uint256 rewardSupplySpeed,
        uint256 rewardBorrowSpeed
    ) public {
        require(rewardType <= 1, "rewardType is invalid");
        require(adminOrInitializing(), "only admin can set reward speed");
        setRewardSpeedInternal(rewardType, jToken, rewardSupplySpeed, rewardBorrowSpeed);
    }

    /**
     * @notice Set JOE/AVAX speed for a single market
     * @param rewardType  0: JOE, 1: AVAX
     * @param jToken The market whose speed to update
     * @param newSupplySpeed New JOE or AVAX supply speed for market
     * @param newBorrowSpeed New JOE or AVAX borrow speed for market
     */
    function setRewardSpeedInternal(
        uint8 rewardType,
        JToken jToken,
        uint256 newSupplySpeed,
        uint256 newBorrowSpeed
    ) internal {
        // Handle new supply speeed
        uint256 currentRewardSupplySpeed = rewardSupplySpeeds[rewardType][address(jToken)];
        if (currentRewardSupplySpeed != 0) {
            // note that JOE speed could be set to 0 to halt liquidity rewards for a market
            updateRewardSupplyIndex(rewardType, address(jToken));
        } else if (newSupplySpeed != 0) {
            // Add the JOE market
            require(joetroller.isMarketListed(address(jToken)), "reward market is not listed");

            if (
                rewardSupplyState[rewardType][address(jToken)].index == 0 &&
                rewardSupplyState[rewardType][address(jToken)].timestamp == 0
            ) {
                rewardSupplyState[rewardType][address(jToken)] = RewardMarketState({
                    index: rewardInitialIndex,
                    timestamp: safe32(getBlockTimestamp(), "block timestamp exceeds 32 bits")
                });
            }
        }

        if (currentRewardSupplySpeed != newSupplySpeed) {
            rewardSupplySpeeds[rewardType][address(jToken)] = newSupplySpeed;
            emit RewardSupplySpeedUpdated(rewardType, jToken, newSupplySpeed);
        }

        // Handle new borrow speed
        uint256 currentRewardBorrowSpeed = rewardBorrowSpeeds[rewardType][address(jToken)];
        if (currentRewardBorrowSpeed != 0) {
            // note that JOE speed could be set to 0 to halt liquidity rewards for a market
            Exp memory borrowIndex = Exp({mantissa: jToken.borrowIndex()});
            updateRewardBorrowIndex(rewardType, address(jToken), borrowIndex);
        } else if (newBorrowSpeed != 0) {
            // Add the JOE market
            require(joetroller.isMarketListed(address(jToken)), "reward market is not listed");

            if (
                rewardBorrowState[rewardType][address(jToken)].index == 0 &&
                rewardBorrowState[rewardType][address(jToken)].timestamp == 0
            ) {
                rewardBorrowState[rewardType][address(jToken)] = RewardMarketState({
                    index: rewardInitialIndex,
                    timestamp: safe32(getBlockTimestamp(), "block timestamp exceeds 32 bits")
                });
            }
        }

        if (currentRewardBorrowSpeed != newBorrowSpeed) {
            rewardBorrowSpeeds[rewardType][address(jToken)] = newBorrowSpeed;
            emit RewardBorrowSpeedUpdated(rewardType, jToken, newBorrowSpeed);
        }
    }

    /**
     * @notice Accrue JOE/AVAX to the market by updating the supply index
     * @param rewardType  0: JOE, 1: AVAX
     * @param jToken The market whose supply index to update
     */
    function updateRewardSupplyIndex(uint8 rewardType, address jToken) internal {
        require(rewardType <= 1, "rewardType is invalid");
        RewardMarketState storage supplyState = rewardSupplyState[rewardType][jToken];
        uint256 supplySpeed = rewardSupplySpeeds[rewardType][jToken];
        uint256 blockTimestamp = getBlockTimestamp();
        uint256 deltaTimestamps = sub_(blockTimestamp, uint256(supplyState.timestamp));
        if (deltaTimestamps > 0 && supplySpeed > 0) {
            uint256 supplyTokens = JToken(jToken).totalSupply();
            uint256 rewardAccrued = mul_(deltaTimestamps, supplySpeed);
            Double memory ratio = supplyTokens > 0 ? fraction(rewardAccrued, supplyTokens) : Double({mantissa: 0});
            Double memory index = add_(Double({mantissa: supplyState.index}), ratio);
            rewardSupplyState[rewardType][jToken] = RewardMarketState({
                index: safe224(index.mantissa, "new index exceeds 224 bits"),
                timestamp: safe32(blockTimestamp, "block timestamp exceeds 32 bits")
            });
        } else if (deltaTimestamps > 0) {
            supplyState.timestamp = safe32(blockTimestamp, "block timestamp exceeds 32 bits");
        }
    }

    /**
     * @notice Accrue JOE/AVAX to the market by updating the borrow index
     * @param rewardType  0: JOE, 1: AVAX
     * @param jToken The market whose borrow index to update
     * @param marketBorrowIndex Current index of the borrow market
     */
    function updateRewardBorrowIndex(
        uint8 rewardType,
        address jToken,
        Exp memory marketBorrowIndex
    ) internal {
        require(rewardType <= 1, "rewardType is invalid");
        RewardMarketState storage borrowState = rewardBorrowState[rewardType][jToken];
        uint256 borrowSpeed = rewardBorrowSpeeds[rewardType][jToken];
        uint256 blockTimestamp = getBlockTimestamp();
        uint256 deltaTimestamps = sub_(blockTimestamp, uint256(borrowState.timestamp));
        if (deltaTimestamps > 0 && borrowSpeed > 0) {
            uint256 borrowAmount = div_(JToken(jToken).totalBorrows(), marketBorrowIndex);
            uint256 rewardAccrued = mul_(deltaTimestamps, borrowSpeed);
            Double memory ratio = borrowAmount > 0 ? fraction(rewardAccrued, borrowAmount) : Double({mantissa: 0});
            Double memory index = add_(Double({mantissa: borrowState.index}), ratio);
            rewardBorrowState[rewardType][jToken] = RewardMarketState({
                index: safe224(index.mantissa, "new index exceeds 224 bits"),
                timestamp: safe32(blockTimestamp, "block timestamp exceeds 32 bits")
            });
        } else if (deltaTimestamps > 0) {
            borrowState.timestamp = safe32(blockTimestamp, "block timestamp exceeds 32 bits");
        }
    }

    /**
     * @notice Calculate JOE/AVAX accrued by a supplier and possibly transfer it to them
     * @param rewardType  0: JOE, 1: AVAX
     * @param jToken The market in which the supplier is interacting
     * @param supplier The address of the supplier to distribute JOE/AVAX to
     */
    function distributeSupplierReward(
        uint8 rewardType,
        address jToken,
        address supplier
    ) internal {
        require(rewardType <= 1, "rewardType is invalid");
        RewardMarketState storage supplyState = rewardSupplyState[rewardType][jToken];
        Double memory supplyIndex = Double({mantissa: supplyState.index});
        Double memory supplierIndex = Double({mantissa: rewardSupplierIndex[rewardType][jToken][supplier]});
        rewardSupplierIndex[rewardType][jToken][supplier] = supplyIndex.mantissa;

        if (supplierIndex.mantissa == 0 && supplyIndex.mantissa > 0) {
            supplierIndex.mantissa = rewardInitialIndex;
        }

        Double memory deltaIndex = sub_(supplyIndex, supplierIndex);
        uint256 supplierTokens = JToken(jToken).balanceOf(supplier);
        uint256 supplierDelta = mul_(supplierTokens, deltaIndex);
        uint256 supplierAccrued = add_(rewardAccrued[rewardType][supplier], supplierDelta);
        rewardAccrued[rewardType][supplier] = supplierAccrued;
        emit DistributedSupplierReward(rewardType, JToken(jToken), supplier, supplierDelta, supplyIndex.mantissa);
    }

    /**
     * @notice Calculate JOE/AVAX accrued by a borrower and possibly transfer it to them
     * @dev Borrowers will not begin to accrue until after the first interaction with the protocol.
     * @param rewardType  0: JOE, 1: AVAX
     * @param jToken The market in which the borrower is interacting
     * @param borrower The address of the borrower to distribute JOE/AVAX to
     * @param marketBorrowIndex Current index of the borrow market
     */
    function distributeBorrowerReward(
        uint8 rewardType,
        address jToken,
        address borrower,
        Exp memory marketBorrowIndex
    ) internal {
        require(rewardType <= 1, "rewardType is invalid");
        RewardMarketState storage borrowState = rewardBorrowState[rewardType][jToken];
        Double memory borrowIndex = Double({mantissa: borrowState.index});
        Double memory borrowerIndex = Double({mantissa: rewardBorrowerIndex[rewardType][jToken][borrower]});
        rewardBorrowerIndex[rewardType][jToken][borrower] = borrowIndex.mantissa;

        if (borrowerIndex.mantissa > 0) {
            Double memory deltaIndex = sub_(borrowIndex, borrowerIndex);
            uint256 borrowerAmount = div_(JToken(jToken).borrowBalanceStored(borrower), marketBorrowIndex);
            uint256 borrowerDelta = mul_(borrowerAmount, deltaIndex);
            uint256 borrowerAccrued = add_(rewardAccrued[rewardType][borrower], borrowerDelta);
            rewardAccrued[rewardType][borrower] = borrowerAccrued;
            emit DistributedBorrowerReward(rewardType, JToken(jToken), borrower, borrowerDelta, borrowIndex.mantissa);
        }
    }

    /**
     * @notice Refactored function to calc and rewards accounts supplier rewards
     * @param jToken The market to verify the mint against
     * @param supplier The supplier to be rewarded
     */
    function updateAndDistributeSupplierRewardsForToken(address jToken, address supplier) external {
        require(adminOrInitializing(), "only admin can update and distribute supplier rewards");
        for (uint8 rewardType = 0; rewardType <= 1; rewardType++) {
            updateRewardSupplyIndex(rewardType, jToken);
            distributeSupplierReward(rewardType, jToken, supplier);
        }
    }

    /**
     * @notice Refactored function to calc and rewards accounts supplier rewards
     * @param jToken The market to verify the mint against
     * @param borrower Borrower to be rewarded
     * @param marketBorrowIndex Current index of the borrow market
     */
    function updateAndDistributeBorrowerRewardsForToken(
        address jToken,
        address borrower,
        Exp calldata marketBorrowIndex
    ) external {
        require(adminOrInitializing(), "only admin can update and distribute borrower rewards");
        for (uint8 rewardType = 0; rewardType <= 1; rewardType++) {
            updateRewardBorrowIndex(rewardType, jToken, marketBorrowIndex);
            distributeBorrowerReward(rewardType, jToken, borrower, marketBorrowIndex);
        }
    }

    /*** User functions ***/

    /**
     * @notice Claim all the JOE/AVAX accrued by holder in all markets
     * @param holder The address to claim JOE/AVAX for
     */
    function claimReward(uint8 rewardType, address payable holder) public {
        return claimReward(rewardType, holder, joetroller.getAllMarkets());
    }

    /**
     * @notice Claim all the JOE/AVAX accrued by holder in the specified markets
     * @param rewardType 0 = JOE, 1 = AVAX
     * @param holder The address to claim JOE/AVAX for
     * @param jTokens The list of markets to claim JOE/AVAX in
     */
    function claimReward(
        uint8 rewardType,
        address payable holder,
        JToken[] memory jTokens
    ) public {
        address payable[] memory holders = new address payable[](1);
        holders[0] = holder;
        claimReward(rewardType, holders, jTokens, true, true);
    }

    /**
     * @notice Claim all JOE/AVAX  accrued by the holders
     * @param rewardType  0 = JOE, 1 = AVAX
     * @param holders The addresses to claim JOE/AVAX for
     * @param jTokens The list of markets to claim JOE/AVAX in
     * @param borrowers Whether or not to claim JOE/AVAX earned by borrowing
     * @param suppliers Whether or not to claim JOE/AVAX earned by supplying
     */
    function claimReward(
        uint8 rewardType,
        address payable[] memory holders,
        JToken[] memory jTokens,
        bool borrowers,
        bool suppliers
    ) public payable {
        require(rewardType <= 1, "rewardType is invalid");
        for (uint256 i = 0; i < jTokens.length; i++) {
            JToken jToken = jTokens[i];
            require(joetroller.isMarketListed(address(jToken)), "market must be listed");
            if (borrowers == true) {
                Exp memory borrowIndex = Exp({mantissa: jToken.borrowIndex()});
                updateRewardBorrowIndex(rewardType, address(jToken), borrowIndex);
                for (uint256 j = 0; j < holders.length; j++) {
                    distributeBorrowerReward(rewardType, address(jToken), holders[j], borrowIndex);
                    rewardAccrued[rewardType][holders[j]] = grantRewardInternal(
                        rewardType,
                        holders[j],
                        rewardAccrued[rewardType][holders[j]]
                    );
                }
            }
            if (suppliers == true) {
                updateRewardSupplyIndex(rewardType, address(jToken));
                for (uint256 j = 0; j < holders.length; j++) {
                    distributeSupplierReward(rewardType, address(jToken), holders[j]);
                    rewardAccrued[rewardType][holders[j]] = grantRewardInternal(
                        rewardType,
                        holders[j],
                        rewardAccrued[rewardType][holders[j]]
                    );
                }
            }
        }
    }

    /**
     * @notice Transfer JOE/AVAX to the user
     * @dev Note: If there is not enough JOE/AVAX, we do not perform the transfer all.
     * @param rewardType 0 = JOE, 1 = AVAX.
     * @param user The address of the user to transfer JOE/AVAX to
     * @param amount The amount of JOE/AVAX to (possibly) transfer
     * @return The amount of JOE/AVAX which was NOT transferred to the user
     */
    function grantRewardInternal(
        uint8 rewardType,
        address payable user,
        uint256 amount
    ) internal returns (uint256) {
        if (rewardType == 0) {
            EIP20Interface joe = EIP20Interface(joeAddress);
            uint256 joeRemaining = joe.balanceOf(address(this));
            if (amount > 0 && amount <= joeRemaining) {
                joe.transfer(user, amount);
                return 0;
            }
        } else if (rewardType == 1) {
            uint256 avaxRemaining = address(this).balance;
            if (amount > 0 && amount <= avaxRemaining) {
                user.transfer(amount);
                return 0;
            }
        }
        return amount;
    }

    /*** Joe Distribution Admin ***/

    /**
     * @notice Transfer JOE to the recipient
     * @dev Note: If there is not enough JOE, we do not perform the transfer all.
     * @param rewardType 0 = JOE, 1 = AVAX
     * @param recipient The address of the recipient to transfer JOE to
     * @param amount The amount of JOE to (possibly) transfer
     */
    function _grantReward(
        uint8 rewardType,
        address payable recipient,
        uint256 amount
    ) public {
        require(adminOrInitializing(), "only admin can grant joe");
        uint256 amountLeft = grantRewardInternal(rewardType, recipient, amount);
        require(amountLeft == 0, "insufficient joe for grant");
        emit RewardGranted(rewardType, recipient, amount);
    }

    /**
     * @notice Set the JOE token address
     */
    function setJoeAddress(address newJoeAddress) public {
        require(msg.sender == admin, "only admin can set JOE");
        joeAddress = newJoeAddress;
    }

    /**
     * @notice Set the Joetroller address
     */
    function setJoetroller(address _joetroller) public {
        require(msg.sender == admin, "only admin can set Joetroller");
        joetroller = Joetroller(_joetroller);
    }

    /**
     * @notice Set the admin
     */
    function setAdmin(address _newAdmin) public {
        require(msg.sender == admin, "only admin can set admin");
        admin = _newAdmin;
    }

    /**
     * @notice payable function needed to receive AVAX
     */
    function() external payable {}

    function getBlockTimestamp() public view returns (uint256) {
        return block.timestamp;
    }
}








/**
 * @title JoetrollerCore
 * @dev Storage for the joetroller is at this address, while execution is delegated to the `implementation`.
 * JTokens should reference this contract as their joetroller.
 */
contract Unitroller is UnitrollerAdminStorage, JoetrollerErrorReporter {
    /**
     * @notice Emitted when pendingImplementation is changed
     */
    event NewPendingImplementation(address oldPendingImplementation, address newPendingImplementation);

    /**
     * @notice Emitted when pendingImplementation is accepted, which means joetroller implementation is updated
     */
    event NewImplementation(address oldImplementation, address newImplementation);

    /**
     * @notice Emitted when pendingAdmin is changed
     */
    event NewPendingAdmin(address oldPendingAdmin, address newPendingAdmin);

    /**
     * @notice Emitted when pendingAdmin is accepted, which means admin is updated
     */
    event NewAdmin(address oldAdmin, address newAdmin);

    constructor() public {
        // Set admin to caller
        admin = msg.sender;
    }

    /*** Admin Functions ***/
    function _setPendingImplementation(address newPendingImplementation) public returns (uint256) {
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_PENDING_IMPLEMENTATION_OWNER_CHECK);
        }

        address oldPendingImplementation = pendingImplementation;

        pendingImplementation = newPendingImplementation;

        emit NewPendingImplementation(oldPendingImplementation, pendingImplementation);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Accepts new implementation of joetroller. msg.sender must be pendingImplementation
     * @dev Admin function for new implementation to accept it's role as implementation
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _acceptImplementation() public returns (uint256) {
        // Check caller is pendingImplementation and pendingImplementation ≠ address(0)
        if (msg.sender != pendingImplementation || pendingImplementation == address(0)) {
            return fail(Error.UNAUTHORIZED, FailureInfo.ACCEPT_PENDING_IMPLEMENTATION_ADDRESS_CHECK);
        }

        // Save current values for inclusion in log
        address oldImplementation = implementation;
        address oldPendingImplementation = pendingImplementation;

        implementation = pendingImplementation;

        pendingImplementation = address(0);

        emit NewImplementation(oldImplementation, implementation);
        emit NewPendingImplementation(oldPendingImplementation, pendingImplementation);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Begins transfer of admin rights. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer.
     * @dev Admin function to begin change of admin. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer.
     * @param newPendingAdmin New pending admin.
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _setPendingAdmin(address newPendingAdmin) public returns (uint256) {
        // Check caller = admin
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_PENDING_ADMIN_OWNER_CHECK);
        }

        // Save current value, if any, for inclusion in log
        address oldPendingAdmin = pendingAdmin;

        // Store pendingAdmin with value newPendingAdmin
        pendingAdmin = newPendingAdmin;

        // Emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin)
        emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Accepts transfer of admin rights. msg.sender must be pendingAdmin
     * @dev Admin function for pending admin to accept role and update admin
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _acceptAdmin() public returns (uint256) {
        // Check caller is pendingAdmin
        if (msg.sender != pendingAdmin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.ACCEPT_ADMIN_PENDING_ADMIN_CHECK);
        }

        // Save current values for inclusion in log
        address oldAdmin = admin;
        address oldPendingAdmin = pendingAdmin;

        // Store admin with value pendingAdmin
        admin = pendingAdmin;

        // Clear the pending value
        pendingAdmin = address(0);

        emit NewAdmin(oldAdmin, admin);
        emit NewPendingAdmin(oldPendingAdmin, pendingAdmin);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @dev Delegates execution to an implementation contract.
     * It returns to the external caller whatever the implementation returns
     * or forwards reverts.
     */
    function() external payable {
        // delegate all other functions to current implementation
        (bool success, ) = implementation.delegatecall(msg.data);

        assembly {
            let free_mem_ptr := mload(0x40)
            returndatacopy(free_mem_ptr, 0, returndatasize)

            switch success
            case 0 {
                revert(free_mem_ptr, returndatasize)
            }
            default {
                return(free_mem_ptr, returndatasize)
            }
        }
    }
}


/**
 * @title Compound's Joetroller Contract
 * @author Compound (modified by Cream)
 */
contract Joetroller is JoetrollerV1Storage, JoetrollerInterface, JoetrollerErrorReporter, Exponential {
    /// @notice Emitted when an admin supports a market
    event MarketListed(JToken jToken);

    /// @notice Emitted when an admin delists a market
    event MarketDelisted(JToken jToken);

    /// @notice Emitted when an account enters a market
    event MarketEntered(JToken jToken, address account);

    /// @notice Emitted when an account exits a market
    event MarketExited(JToken jToken, address account);

    /// @notice Emitted when close factor is changed by admin
    event NewCloseFactor(uint256 oldCloseFactorMantissa, uint256 newCloseFactorMantissa);

    /// @notice Emitted when a collateral factor is changed by admin
    event NewCollateralFactor(JToken jToken, uint256 oldCollateralFactorMantissa, uint256 newCollateralFactorMantissa);

    /// @notice Emitted when liquidation incentive is changed by admin
    event NewLiquidationIncentive(uint256 oldLiquidationIncentiveMantissa, uint256 newLiquidationIncentiveMantissa);

    /// @notice Emitted when price oracle is changed
    event NewPriceOracle(PriceOracle oldPriceOracle, PriceOracle newPriceOracle);

    /// @notice Emitted when pause guardian is changed
    event NewPauseGuardian(address oldPauseGuardian, address newPauseGuardian);

    /// @notice Emitted when an action is paused globally
    event ActionPaused(string action, bool pauseState);

    /// @notice Emitted when an action is paused on a market
    event ActionPaused(JToken jToken, string action, bool pauseState);

    /// @notice Emitted when borrow cap for a jToken is changed
    event NewBorrowCap(JToken indexed jToken, uint256 newBorrowCap);

    /// @notice Emitted when borrow cap guardian is changed
    event NewBorrowCapGuardian(address oldBorrowCapGuardian, address newBorrowCapGuardian);

    /// @notice Emitted when supply cap for a jToken is changed
    event NewSupplyCap(JToken indexed jToken, uint256 newSupplyCap);

    /// @notice Emitted when supply cap guardian is changed
    event NewSupplyCapGuardian(address oldSupplyCapGuardian, address newSupplyCapGuardian);

    /// @notice Emitted when protocol's credit limit has changed
    event CreditLimitChanged(address protocol, uint256 creditLimit);

    /// @notice Emitted when jToken version is changed
    event NewJTokenVersion(JToken jToken, Version oldVersion, Version newVersion);

    // No collateralFactorMantissa may exceed this value
    uint256 internal constant collateralFactorMaxMantissa = 0.9e18; // 0.9

    constructor() public {
        admin = msg.sender;
    }

    /**
     * @notice Return all of the markets
     * @dev The automatic getter may be used to access an individual market.
     * @return The list of market addresses
     */
    function getAllMarkets() public view returns (JToken[] memory) {
        return allMarkets;
    }

    function getBlockTimestamp() public view returns (uint256) {
        return block.timestamp;
    }

    /*** Assets You Are In ***/

    /**
     * @notice Returns the assets an account has entered
     * @param account The address of the account to pull assets for
     * @return A dynamic list with the assets the account has entered
     */
    function getAssetsIn(address account) external view returns (JToken[] memory) {
        JToken[] memory assetsIn = accountAssets[account];

        return assetsIn;
    }

    /**
     * @notice Returns whether the given account is entered in the given asset
     * @param account The address of the account to check
     * @param jToken The jToken to check
     * @return True if the account is in the asset, otherwise false.
     */
    function checkMembership(address account, JToken jToken) external view returns (bool) {
        return markets[address(jToken)].accountMembership[account];
    }

    /**
     * @notice Add assets to be included in account liquidity calculation
     * @param jTokens The list of addresses of the jToken markets to be enabled
     * @return Success indicator for whether each corresponding market was entered
     */
    function enterMarkets(address[] memory jTokens) public returns (uint256[] memory) {
        uint256 len = jTokens.length;

        uint256[] memory results = new uint256[](len);
        for (uint256 i = 0; i < len; i++) {
            JToken jToken = JToken(jTokens[i]);

            results[i] = uint256(addToMarketInternal(jToken, msg.sender));
        }

        return results;
    }

    /**
     * @notice Add the market to the borrower's "assets in" for liquidity calculations
     * @param jToken The market to enter
     * @param borrower The address of the account to modify
     * @return Success indicator for whether the market was entered
     */
    function addToMarketInternal(JToken jToken, address borrower) internal returns (Error) {
        Market storage marketToJoin = markets[address(jToken)];

        if (!marketToJoin.isListed) {
            // market is not listed, cannot join
            return Error.MARKET_NOT_LISTED;
        }

        if (marketToJoin.version == Version.COLLATERALCAP) {
            // register collateral for the borrower if the token is CollateralCap version.
            JCollateralCapErc20Interface(address(jToken)).registerCollateral(borrower);
        }

        if (marketToJoin.accountMembership[borrower] == true) {
            // already joined
            return Error.NO_ERROR;
        }

        // survived the gauntlet, add to list
        // NOTE: we store these somewhat redundantly as a significant optimization
        //  this avoids having to iterate through the list for the most common use cases
        //  that is, only when we need to perform liquidity checks
        //  and not whenever we want to check if an account is in a particular market
        marketToJoin.accountMembership[borrower] = true;
        accountAssets[borrower].push(jToken);

        emit MarketEntered(jToken, borrower);

        return Error.NO_ERROR;
    }

    /**
     * @notice Removes asset from sender's account liquidity calculation
     * @dev Sender must not have an outstanding borrow balance in the asset,
     *  or be providing necessary collateral for an outstanding borrow.
     * @param jTokenAddress The address of the asset to be removed
     * @return Whether or not the account successfully exited the market
     */
    function exitMarket(address jTokenAddress) external returns (uint256) {
        JToken jToken = JToken(jTokenAddress);
        /* Get sender tokensHeld and amountOwed underlying from the jToken */
        (uint256 oErr, uint256 tokensHeld, uint256 amountOwed, ) = jToken.getAccountSnapshot(msg.sender);
        require(oErr == 0, "exitMarket: getAccountSnapshot failed"); // semi-opaque error code

        /* Fail if the sender has a borrow balance */
        if (amountOwed != 0) {
            return fail(Error.NONZERO_BORROW_BALANCE, FailureInfo.EXIT_MARKET_BALANCE_OWED);
        }

        /* Fail if the sender is not permitted to redeem all of their tokens */
        uint256 allowed = redeemAllowedInternal(jTokenAddress, msg.sender, tokensHeld);
        if (allowed != 0) {
            return failOpaque(Error.REJECTION, FailureInfo.EXIT_MARKET_REJECTION, allowed);
        }

        Market storage marketToExit = markets[jTokenAddress];

        if (marketToExit.version == Version.COLLATERALCAP) {
            JCollateralCapErc20Interface(jTokenAddress).unregisterCollateral(msg.sender);
        }

        /* Return true if the sender is not already ‘in’ the market */
        if (!marketToExit.accountMembership[msg.sender]) {
            return uint256(Error.NO_ERROR);
        }

        /* Set jToken account membership to false */
        delete marketToExit.accountMembership[msg.sender];

        /* Delete jToken from the account’s list of assets */
        // load into memory for faster iteration
        JToken[] memory userAssetList = accountAssets[msg.sender];
        uint256 len = userAssetList.length;
        uint256 assetIndex = len;
        for (uint256 i = 0; i < len; i++) {
            if (userAssetList[i] == jToken) {
                assetIndex = i;
                break;
            }
        }

        // We *must* have found the asset in the list or our redundant data structure is broken
        assert(assetIndex < len);

        // copy last item in list to location of item to be removed, reduce length by 1
        JToken[] storage storedList = accountAssets[msg.sender];
        if (assetIndex != storedList.length - 1) {
            storedList[assetIndex] = storedList[storedList.length - 1];
        }
        storedList.length--;

        emit MarketExited(jToken, msg.sender);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Return whether a specific market is listed or not
     * @param jTokenAddress The address of the asset to be checked
     * @return Whether or not the market is listed
     */
    function isMarketListed(address jTokenAddress) public view returns (bool) {
        return markets[jTokenAddress].isListed;
    }

    /*** Policy Hooks ***/

    /**
     * @notice Checks if the account should be allowed to mint tokens in the given market
     * @param jToken The market to verify the mint against
     * @param minter The account which would get the minted tokens
     * @param mintAmount The amount of underlying being supplied to the market in exchange for tokens
     * @return 0 if the mint is allowed, otherwise a semi-opaque error code (See ErrorReporter.sol)
     */
    function mintAllowed(
        address jToken,
        address minter,
        uint256 mintAmount
    ) external returns (uint256) {
        // Pausing is a very serious situation - we revert to sound the alarms
        require(!mintGuardianPaused[jToken], "mint is paused");
        require(!isCreditAccount(minter), "credit account cannot mint");

        if (!isMarketListed(jToken)) {
            return uint256(Error.MARKET_NOT_LISTED);
        }

        uint256 supplyCap = supplyCaps[jToken];
        // Supply cap of 0 corresponds to unlimited supplying
        if (supplyCap != 0) {
            uint256 totalCash = JToken(jToken).getCash();
            uint256 totalBorrows = JToken(jToken).totalBorrows();
            uint256 totalReserves = JToken(jToken).totalReserves();
            // totalSupplies = totalCash + totalBorrows - totalReserves
            (MathError mathErr, uint256 totalSupplies) = addThenSubUInt(totalCash, totalBorrows, totalReserves);
            require(mathErr == MathError.NO_ERROR, "totalSupplies failed");

            uint256 nextTotalSupplies = add_(totalSupplies, mintAmount);
            require(nextTotalSupplies < supplyCap, "market supply cap reached");
        }

        // Keep the flywheel moving
        RewardDistributor(rewardDistributor).updateAndDistributeSupplierRewardsForToken(jToken, minter);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Validates mint and reverts on rejection. May emit logs.
     * @param jToken Asset being minted
     * @param minter The address minting the tokens
     * @param actualMintAmount The amount of the underlying asset being minted
     * @param mintTokens The number of tokens being minted
     */
    function mintVerify(
        address jToken,
        address minter,
        uint256 actualMintAmount,
        uint256 mintTokens
    ) external {
        // Shh - currently unused
        jToken;
        minter;
        actualMintAmount;
        mintTokens;

        // Shh - we don't ever want this hook to be marked pure
        if (false) {
            closeFactorMantissa = closeFactorMantissa;
        }
    }

    /**
     * @notice Checks if the account should be allowed to redeem tokens in the given market
     * @param jToken The market to verify the redeem against
     * @param redeemer The account which would redeem the tokens
     * @param redeemTokens The number of jTokens to exchange for the underlying asset in the market
     * @return 0 if the redeem is allowed, otherwise a semi-opaque error code (See ErrorReporter.sol)
     */
    function redeemAllowed(
        address jToken,
        address redeemer,
        uint256 redeemTokens
    ) external returns (uint256) {
        uint256 allowed = redeemAllowedInternal(jToken, redeemer, redeemTokens);
        if (allowed != uint256(Error.NO_ERROR)) {
            return allowed;
        }

        // Keep the flywheel going
        RewardDistributor(rewardDistributor).updateAndDistributeSupplierRewardsForToken(jToken, redeemer);
        return uint256(Error.NO_ERROR);
    }

    function redeemAllowedInternal(
        address jToken,
        address redeemer,
        uint256 redeemTokens
    ) internal view returns (uint256) {
        if (!isMarketListed(jToken)) {
            return uint256(Error.MARKET_NOT_LISTED);
        }

        /* If the redeemer is not 'in' the market, then we can bypass the liquidity check */
        if (!markets[jToken].accountMembership[redeemer]) {
            return uint256(Error.NO_ERROR);
        }

        /* Otherwise, perform a hypothetical liquidity check to guard against shortfall */
        (Error err, , uint256 shortfall) = getHypotheticalAccountLiquidityInternal(
            redeemer,
            JToken(jToken),
            redeemTokens,
            0
        );
        if (err != Error.NO_ERROR) {
            return uint256(err);
        }
        if (shortfall > 0) {
            return uint256(Error.INSUFFICIENT_LIQUIDITY);
        }

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Validates redeem and reverts on rejection. May emit logs.
     * @param jToken Asset being redeemed
     * @param redeemer The address redeeming the tokens
     * @param redeemAmount The amount of the underlying asset being redeemed
     * @param redeemTokens The number of tokens being redeemed
     */
    function redeemVerify(
        address jToken,
        address redeemer,
        uint256 redeemAmount,
        uint256 redeemTokens
    ) external {
        // Shh - currently unused
        jToken;
        redeemer;

        // Require tokens is zero or amount is also zero
        if (redeemTokens == 0 && redeemAmount > 0) {
            revert("redeemTokens zero");
        }
    }

    /**
     * @notice Checks if the account should be allowed to borrow the underlying asset of the given market
     * @param jToken The market to verify the borrow against
     * @param borrower The account which would borrow the asset
     * @param borrowAmount The amount of underlying the account would borrow
     * @return 0 if the borrow is allowed, otherwise a semi-opaque error code (See ErrorReporter.sol)
     */
    function borrowAllowed(
        address jToken,
        address borrower,
        uint256 borrowAmount
    ) external returns (uint256) {
        // Pausing is a very serious situation - we revert to sound the alarms
        require(!borrowGuardianPaused[jToken], "borrow is paused");

        if (!isMarketListed(jToken)) {
            return uint256(Error.MARKET_NOT_LISTED);
        }

        if (!markets[jToken].accountMembership[borrower]) {
            // only jTokens may call borrowAllowed if borrower not in market
            require(msg.sender == jToken, "sender must be jToken");

            // attempt to add borrower to the market
            Error err = addToMarketInternal(JToken(jToken), borrower);
            if (err != Error.NO_ERROR) {
                return uint256(err);
            }

            // it should be impossible to break the important invariant
            assert(markets[jToken].accountMembership[borrower]);
        }

        if (oracle.getUnderlyingPrice(JToken(jToken)) == 0) {
            return uint256(Error.PRICE_ERROR);
        }

        uint256 borrowCap = borrowCaps[jToken];
        // Borrow cap of 0 corresponds to unlimited borrowing
        if (borrowCap != 0) {
            uint256 totalBorrows = JToken(jToken).totalBorrows();
            uint256 nextTotalBorrows = add_(totalBorrows, borrowAmount);
            require(nextTotalBorrows < borrowCap, "market borrow cap reached");
        }

        (Error err, , uint256 shortfall) = getHypotheticalAccountLiquidityInternal(
            borrower,
            JToken(jToken),
            0,
            borrowAmount
        );
        if (err != Error.NO_ERROR) {
            return uint256(err);
        }
        if (shortfall > 0) {
            return uint256(Error.INSUFFICIENT_LIQUIDITY);
        }

        // Keep the flywheel going
        Exp memory borrowIndex = Exp({mantissa: JToken(jToken).borrowIndex()});
        RewardDistributor(rewardDistributor).updateAndDistributeBorrowerRewardsForToken(jToken, borrower, borrowIndex);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Validates borrow and reverts on rejection. May emit logs.
     * @param jToken Asset whose underlying is being borrowed
     * @param borrower The address borrowing the underlying
     * @param borrowAmount The amount of the underlying asset requested to borrow
     */
    function borrowVerify(
        address jToken,
        address borrower,
        uint256 borrowAmount
    ) external {
        // Shh - currently unused
        jToken;
        borrower;
        borrowAmount;

        // Shh - we don't ever want this hook to be marked pure
        if (false) {
            closeFactorMantissa = closeFactorMantissa;
        }
    }

    /**
     * @notice Checks if the account should be allowed to repay a borrow in the given market
     * @param jToken The market to verify the repay against
     * @param payer The account which would repay the asset
     * @param borrower The account which borrowed the asset
     * @param repayAmount The amount of the underlying asset the account would repay
     * @return 0 if the repay is allowed, otherwise a semi-opaque error code (See ErrorReporter.sol)
     */
    function repayBorrowAllowed(
        address jToken,
        address payer,
        address borrower,
        uint256 repayAmount
    ) external returns (uint256) {
        // Shh - currently unused
        payer;
        borrower;
        repayAmount;

        if (!isMarketListed(jToken)) {
            return uint256(Error.MARKET_NOT_LISTED);
        }

        // Keep the flywheel going
        Exp memory borrowIndex = Exp({mantissa: JToken(jToken).borrowIndex()});
        RewardDistributor(rewardDistributor).updateAndDistributeBorrowerRewardsForToken(jToken, borrower, borrowIndex);
        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Validates repayBorrow and reverts on rejection. May emit logs.
     * @param jToken Asset being repaid
     * @param payer The address repaying the borrow
     * @param borrower The address of the borrower
     * @param actualRepayAmount The amount of underlying being repaid
     */
    function repayBorrowVerify(
        address jToken,
        address payer,
        address borrower,
        uint256 actualRepayAmount,
        uint256 borrowerIndex
    ) external {
        // Shh - currently unused
        jToken;
        payer;
        borrower;
        actualRepayAmount;
        borrowerIndex;

        // Shh - we don't ever want this hook to be marked pure
        if (false) {
            closeFactorMantissa = closeFactorMantissa;
        }
    }

    /**
     * @notice Checks if the liquidation should be allowed to occur
     * @param jTokenBorrowed Asset which was borrowed by the borrower
     * @param jTokenCollateral Asset which was used as collateral and will be seized
     * @param liquidator The address repaying the borrow and seizing the collateral
     * @param borrower The address of the borrower
     * @param repayAmount The amount of underlying being repaid
     */
    function liquidateBorrowAllowed(
        address jTokenBorrowed,
        address jTokenCollateral,
        address liquidator,
        address borrower,
        uint256 repayAmount
    ) external returns (uint256) {
        require(!isCreditAccount(borrower), "cannot liquidate credit account");

        // Shh - currently unused
        liquidator;

        if (!isMarketListed(jTokenBorrowed) || !isMarketListed(jTokenCollateral)) {
            return uint256(Error.MARKET_NOT_LISTED);
        }

        /* The borrower must have shortfall in order to be liquidatable */
        (Error err, , uint256 shortfall) = getAccountLiquidityInternal(borrower);
        if (err != Error.NO_ERROR) {
            return uint256(err);
        }
        if (shortfall == 0) {
            return uint256(Error.INSUFFICIENT_SHORTFALL);
        }

        /* The liquidator may not repay more than what is allowed by the closeFactor */
        uint256 borrowBalance = JToken(jTokenBorrowed).borrowBalanceStored(borrower);
        uint256 maxClose = mul_ScalarTruncate(Exp({mantissa: closeFactorMantissa}), borrowBalance);
        if (repayAmount > maxClose) {
            return uint256(Error.TOO_MUCH_REPAY);
        }

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Validates liquidateBorrow and reverts on rejection. May emit logs.
     * @param jTokenBorrowed Asset which was borrowed by the borrower
     * @param jTokenCollateral Asset which was used as collateral and will be seized
     * @param liquidator The address repaying the borrow and seizing the collateral
     * @param borrower The address of the borrower
     * @param actualRepayAmount The amount of underlying being repaid
     */
    function liquidateBorrowVerify(
        address jTokenBorrowed,
        address jTokenCollateral,
        address liquidator,
        address borrower,
        uint256 actualRepayAmount,
        uint256 seizeTokens
    ) external {
        // Shh - currently unused
        jTokenBorrowed;
        jTokenCollateral;
        liquidator;
        borrower;
        actualRepayAmount;
        seizeTokens;

        // Shh - we don't ever want this hook to be marked pure
        if (false) {
            closeFactorMantissa = closeFactorMantissa;
        }
    }

    /**
     * @notice Checks if the seizing of assets should be allowed to occur
     * @param jTokenCollateral Asset which was used as collateral and will be seized
     * @param jTokenBorrowed Asset which was borrowed by the borrower
     * @param liquidator The address repaying the borrow and seizing the collateral
     * @param borrower The address of the borrower
     * @param seizeTokens The number of collateral tokens to seize
     */
    function seizeAllowed(
        address jTokenCollateral,
        address jTokenBorrowed,
        address liquidator,
        address borrower,
        uint256 seizeTokens
    ) external returns (uint256) {
        // Pausing is a very serious situation - we revert to sound the alarms
        require(!seizeGuardianPaused, "seize is paused");
        require(!isCreditAccount(borrower), "cannot sieze from credit account");

        // Shh - currently unused
        liquidator;
        seizeTokens;

        if (!isMarketListed(jTokenCollateral) || !isMarketListed(jTokenBorrowed)) {
            return uint256(Error.MARKET_NOT_LISTED);
        }

        if (JToken(jTokenCollateral).joetroller() != JToken(jTokenBorrowed).joetroller()) {
            return uint256(Error.JOETROLLER_MISMATCH);
        }

        // Keep the flywheel moving
        RewardDistributor(rewardDistributor).updateAndDistributeSupplierRewardsForToken(jTokenCollateral, borrower);
        RewardDistributor(rewardDistributor).updateAndDistributeSupplierRewardsForToken(jTokenCollateral, liquidator);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Validates seize and reverts on rejection. May emit logs.
     * @param jTokenCollateral Asset which was used as collateral and will be seized
     * @param jTokenBorrowed Asset which was borrowed by the borrower
     * @param liquidator The address repaying the borrow and seizing the collateral
     * @param borrower The address of the borrower
     * @param seizeTokens The number of collateral tokens to seize
     */
    function seizeVerify(
        address jTokenCollateral,
        address jTokenBorrowed,
        address liquidator,
        address borrower,
        uint256 seizeTokens
    ) external {
        // Shh - currently unused
        jTokenCollateral;
        jTokenBorrowed;
        liquidator;
        borrower;
        seizeTokens;

        // Shh - we don't ever want this hook to be marked pure
        if (false) {
            closeFactorMantissa = closeFactorMantissa;
        }
    }

    /**
     * @notice Checks if the account should be allowed to transfer tokens in the given market
     * @param jToken The market to verify the transfer against
     * @param src The account which sources the tokens
     * @param dst The account which receives the tokens
     * @param transferTokens The number of jTokens to transfer
     * @return 0 if the transfer is allowed, otherwise a semi-opaque error code (See ErrorReporter.sol)
     */
    function transferAllowed(
        address jToken,
        address src,
        address dst,
        uint256 transferTokens
    ) external returns (uint256) {
        // Pausing is a very serious situation - we revert to sound the alarms
        require(!transferGuardianPaused, "transfer is paused");
        require(!isCreditAccount(dst), "cannot transfer to a credit account");

        // Shh - currently unused
        dst;

        // Currently the only consideration is whether or not
        //  the src is allowed to redeem this many tokens
        uint256 allowed = redeemAllowedInternal(jToken, src, transferTokens);
        if (allowed != uint256(Error.NO_ERROR)) {
            return allowed;
        }

        // Keep the flywheel moving
        RewardDistributor(rewardDistributor).updateAndDistributeSupplierRewardsForToken(jToken, src);
        RewardDistributor(rewardDistributor).updateAndDistributeSupplierRewardsForToken(jToken, dst);
        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Validates transfer and reverts on rejection. May emit logs.
     * @param jToken Asset being transferred
     * @param src The account which sources the tokens
     * @param dst The account which receives the tokens
     * @param transferTokens The number of jTokens to transfer
     */
    function transferVerify(
        address jToken,
        address src,
        address dst,
        uint256 transferTokens
    ) external {
        // Shh - currently unused
        jToken;
        src;
        dst;
        transferTokens;

        // Shh - we don't ever want this hook to be marked pure
        if (false) {
            closeFactorMantissa = closeFactorMantissa;
        }
    }

    /**
     * @notice Checks if the account should be allowed to transfer tokens in the given market
     * @param jToken The market to verify the transfer against
     * @param receiver The account which receives the tokens
     * @param amount The amount of the tokens
     * @param params The other parameters
     */

    function flashloanAllowed(
        address jToken,
        address receiver,
        uint256 amount,
        bytes calldata params
    ) external view returns (bool) {
        return !flashloanGuardianPaused[jToken];
    }

    /**
     * @notice Update JToken's version.
     * @param jToken Version of the asset being updated
     * @param newVersion The new version
     */
    function updateJTokenVersion(address jToken, Version newVersion) external {
        require(msg.sender == jToken, "only jToken could update its version");

        // This function will be called when a new JToken implementation becomes active.
        // If a new JToken is newly created, this market is not listed yet. The version of
        // this market will be taken care of when calling `_supportMarket`.
        if (isMarketListed(jToken)) {
            Version oldVersion = markets[jToken].version;
            markets[jToken].version = newVersion;

            emit NewJTokenVersion(JToken(jToken), oldVersion, newVersion);
        }
    }

    /**
     * @notice Check if the account is a credit account
     * @param account The account needs to be checked
     * @return The account is a credit account or not
     */
    function isCreditAccount(address account) public view returns (bool) {
        return creditLimits[account] > 0;
    }

    /*** Liquidity/Liquidation Calculations ***/

    /**
     * @dev Local vars for avoiding stack-depth limits in calculating account liquidity.
     *  Note that `jTokenBalance` is the number of jTokens the account owns in the market,
     *  whereas `borrowBalance` is the amount of underlying that the account has borrowed.
     */
    struct AccountLiquidityLocalVars {
        uint256 sumCollateral;
        uint256 sumBorrowPlusEffects;
        uint256 jTokenBalance;
        uint256 borrowBalance;
        uint256 exchangeRateMantissa;
        uint256 oraclePriceMantissa;
        Exp collateralFactor;
        Exp exchangeRate;
        Exp oraclePrice;
        Exp tokensToDenom;
    }

    /**
     * @notice Determine the current account liquidity wrt collateral requirements
     * @return (possible error code (semi-opaque),
                account liquidity in excess of collateral requirements,
     *          account shortfall below collateral requirements)
     */
    function getAccountLiquidity(address account)
        public
        view
        returns (
            uint256,
            uint256,
            uint256
        )
    {
        (Error err, uint256 liquidity, uint256 shortfall) = getHypotheticalAccountLiquidityInternal(
            account,
            JToken(0),
            0,
            0
        );

        return (uint256(err), liquidity, shortfall);
    }

    /**
     * @notice Determine the current account liquidity wrt collateral requirements
     * @return (possible error code,
                account liquidity in excess of collateral requirements,
     *          account shortfall below collateral requirements)
     */
    function getAccountLiquidityInternal(address account)
        internal
        view
        returns (
            Error,
            uint256,
            uint256
        )
    {
        return getHypotheticalAccountLiquidityInternal(account, JToken(0), 0, 0);
    }

    /**
     * @notice Determine what the account liquidity would be if the given amounts were redeemed/borrowed
     * @param jTokenModify The market to hypothetically redeem/borrow in
     * @param account The account to determine liquidity for
     * @param redeemTokens The number of tokens to hypothetically redeem
     * @param borrowAmount The amount of underlying to hypothetically borrow
     * @return (possible error code (semi-opaque),
                hypothetical account liquidity in excess of collateral requirements,
     *          hypothetical account shortfall below collateral requirements)
     */
    function getHypotheticalAccountLiquidity(
        address account,
        address jTokenModify,
        uint256 redeemTokens,
        uint256 borrowAmount
    )
        public
        view
        returns (
            uint256,
            uint256,
            uint256
        )
    {
        (Error err, uint256 liquidity, uint256 shortfall) = getHypotheticalAccountLiquidityInternal(
            account,
            JToken(jTokenModify),
            redeemTokens,
            borrowAmount
        );
        return (uint256(err), liquidity, shortfall);
    }

    /**
     * @notice Determine what the account liquidity would be if the given amounts were redeemed/borrowed
     * @param jTokenModify The market to hypothetically redeem/borrow in
     * @param account The account to determine liquidity for
     * @param redeemTokens The number of tokens to hypothetically redeem
     * @param borrowAmount The amount of underlying to hypothetically borrow
     * @dev Note that we calculate the exchangeRateStored for each collateral jToken using stored data,
     *  without calculating accumulated interest.
     * @return (possible error code,
                hypothetical account liquidity in excess of collateral requirements,
     *          hypothetical account shortfall below collateral requirements)
     */
    function getHypotheticalAccountLiquidityInternal(
        address account,
        JToken jTokenModify,
        uint256 redeemTokens,
        uint256 borrowAmount
    )
        internal
        view
        returns (
            Error,
            uint256,
            uint256
        )
    {
        // If credit limit is set to MAX, no need to check account liquidity.
        if (creditLimits[account] == uint256(-1)) {
            return (Error.NO_ERROR, uint256(-1), 0);
        }

        AccountLiquidityLocalVars memory vars; // Holds all our calculation results
        uint256 oErr;

        // For each asset the account is in
        JToken[] memory assets = accountAssets[account];
        for (uint256 i = 0; i < assets.length; i++) {
            JToken asset = assets[i];

            // Read the balances and exchange rate from the jToken
            (oErr, vars.jTokenBalance, vars.borrowBalance, vars.exchangeRateMantissa) = asset.getAccountSnapshot(
                account
            );
            if (oErr != 0) {
                // semi-opaque error code, we assume NO_ERROR == 0 is invariant between upgrades
                return (Error.SNAPSHOT_ERROR, 0, 0);
            }

            // Unlike compound protocol, getUnderlyingPrice is relatively expensive because we use ChainLink as our primary price feed.
            // If user has no supply / borrow balance on this asset, and user is not redeeming / borrowing this asset, skip it.
            if (vars.jTokenBalance == 0 && vars.borrowBalance == 0 && asset != jTokenModify) {
                continue;
            }

            vars.collateralFactor = Exp({mantissa: markets[address(asset)].collateralFactorMantissa});
            vars.exchangeRate = Exp({mantissa: vars.exchangeRateMantissa});

            // Get the normalized price of the asset
            vars.oraclePriceMantissa = oracle.getUnderlyingPrice(asset);
            if (vars.oraclePriceMantissa == 0) {
                return (Error.PRICE_ERROR, 0, 0);
            }
            vars.oraclePrice = Exp({mantissa: vars.oraclePriceMantissa});

            // Pre-compute a conversion factor from tokens -> ether (normalized price value)
            vars.tokensToDenom = mul_(mul_(vars.collateralFactor, vars.exchangeRate), vars.oraclePrice);

            // sumCollateral += tokensToDenom * jTokenBalance
            vars.sumCollateral = mul_ScalarTruncateAddUInt(vars.tokensToDenom, vars.jTokenBalance, vars.sumCollateral);

            // sumBorrowPlusEffects += oraclePrice * borrowBalance
            vars.sumBorrowPlusEffects = mul_ScalarTruncateAddUInt(
                vars.oraclePrice,
                vars.borrowBalance,
                vars.sumBorrowPlusEffects
            );

            // Calculate effects of interacting with jTokenModify
            if (asset == jTokenModify) {
                // redeem effect
                // sumBorrowPlusEffects += tokensToDenom * redeemTokens
                vars.sumBorrowPlusEffects = mul_ScalarTruncateAddUInt(
                    vars.tokensToDenom,
                    redeemTokens,
                    vars.sumBorrowPlusEffects
                );

                // borrow effect
                // sumBorrowPlusEffects += oraclePrice * borrowAmount
                vars.sumBorrowPlusEffects = mul_ScalarTruncateAddUInt(
                    vars.oraclePrice,
                    borrowAmount,
                    vars.sumBorrowPlusEffects
                );
            }
        }

        // If credit limit is set, no need to consider collateral.
        if (creditLimits[account] > 0) {
            vars.sumCollateral = creditLimits[account];
        }

        // These are safe, as the underflow condition is checked first
        if (vars.sumCollateral > vars.sumBorrowPlusEffects) {
            return (Error.NO_ERROR, vars.sumCollateral - vars.sumBorrowPlusEffects, 0);
        } else {
            return (Error.NO_ERROR, 0, vars.sumBorrowPlusEffects - vars.sumCollateral);
        }
    }

    /**
     * @notice Calculate number of tokens of collateral asset to seize given an underlying amount
     * @dev Used in liquidation (called in jToken.liquidateBorrowFresh)
     * @param jTokenBorrowed The address of the borrowed jToken
     * @param jTokenCollateral The address of the collateral jToken
     * @param actualRepayAmount The amount of jTokenBorrowed underlying to convert into jTokenCollateral tokens
     * @return (errorCode, number of jTokenCollateral tokens to be seized in a liquidation)
     */
    function liquidateCalculateSeizeTokens(
        address jTokenBorrowed,
        address jTokenCollateral,
        uint256 actualRepayAmount
    ) external view returns (uint256, uint256) {
        /* Read oracle prices for borrowed and collateral markets */
        uint256 priceBorrowedMantissa = oracle.getUnderlyingPrice(JToken(jTokenBorrowed));
        uint256 priceCollateralMantissa = oracle.getUnderlyingPrice(JToken(jTokenCollateral));
        if (priceBorrowedMantissa == 0 || priceCollateralMantissa == 0) {
            return (uint256(Error.PRICE_ERROR), 0);
        }

        /*
         * Get the exchange rate and calculate the number of collateral tokens to seize:
         *  seizeAmount = actualRepayAmount * liquidationIncentive * priceBorrowed / priceCollateral
         *  seizeTokens = seizeAmount / exchangeRate
         *   = actualRepayAmount * (liquidationIncentive * priceBorrowed) / (priceCollateral * exchangeRate)
         */
        uint256 exchangeRateMantissa = JToken(jTokenCollateral).exchangeRateStored(); // Note: reverts on error
        Exp memory numerator = mul_(
            Exp({mantissa: liquidationIncentiveMantissa}),
            Exp({mantissa: priceBorrowedMantissa})
        );
        Exp memory denominator = mul_(Exp({mantissa: priceCollateralMantissa}), Exp({mantissa: exchangeRateMantissa}));
        Exp memory ratio = div_(numerator, denominator);
        uint256 seizeTokens = mul_ScalarTruncate(ratio, actualRepayAmount);

        return (uint256(Error.NO_ERROR), seizeTokens);
    }

    /*** Admin Functions ***/

    function _setRewardDistributor(address payable newRewardDistributor) public returns (uint256) {
        if (msg.sender != admin) {
            return uint256(Error.UNAUTHORIZED);
        }
        (bool success, ) = newRewardDistributor.call.value(0)(abi.encodeWithSignature("initialize()", 0));
        if (!success) {
            return uint256(Error.REJECTION);
        }

        address oldRewardDistributor = rewardDistributor;
        rewardDistributor = newRewardDistributor;

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Sets a new price oracle for the joetroller
     * @dev Admin function to set a new price oracle
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _setPriceOracle(PriceOracle newOracle) public returns (uint256) {
        // Check caller is admin
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_PRICE_ORACLE_OWNER_CHECK);
        }

        // Track the old oracle for the joetroller
        PriceOracle oldOracle = oracle;

        // Set joetroller's oracle to newOracle
        oracle = newOracle;

        // Emit NewPriceOracle(oldOracle, newOracle)
        emit NewPriceOracle(oldOracle, newOracle);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Sets the closeFactor used when liquidating borrows
     * @dev Admin function to set closeFactor
     * @param newCloseFactorMantissa New close factor, scaled by 1e18
     * @return uint 0=success, otherwise a failure. (See ErrorReporter for details)
     */
    function _setCloseFactor(uint256 newCloseFactorMantissa) external returns (uint256) {
        // Check caller is admin
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_CLOSE_FACTOR_OWNER_CHECK);
        }

        uint256 oldCloseFactorMantissa = closeFactorMantissa;
        closeFactorMantissa = newCloseFactorMantissa;
        emit NewCloseFactor(oldCloseFactorMantissa, closeFactorMantissa);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Sets the collateralFactor for a market
     * @dev Admin function to set per-market collateralFactor
     * @param jToken The market to set the factor on
     * @param newCollateralFactorMantissa The new collateral factor, scaled by 1e18
     * @return uint 0=success, otherwise a failure. (See ErrorReporter for details)
     */
    function _setCollateralFactor(JToken jToken, uint256 newCollateralFactorMantissa) external returns (uint256) {
        // Check caller is admin
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_COLLATERAL_FACTOR_OWNER_CHECK);
        }

        // Verify market is listed
        Market storage market = markets[address(jToken)];
        if (!market.isListed) {
            return fail(Error.MARKET_NOT_LISTED, FailureInfo.SET_COLLATERAL_FACTOR_NO_EXISTS);
        }

        Exp memory newCollateralFactorExp = Exp({mantissa: newCollateralFactorMantissa});

        // Check collateral factor <= 0.9
        Exp memory highLimit = Exp({mantissa: collateralFactorMaxMantissa});
        if (lessThanExp(highLimit, newCollateralFactorExp)) {
            return fail(Error.INVALID_COLLATERAL_FACTOR, FailureInfo.SET_COLLATERAL_FACTOR_VALIDATION);
        }

        // If collateral factor != 0, fail if price == 0
        if (newCollateralFactorMantissa != 0 && oracle.getUnderlyingPrice(jToken) == 0) {
            return fail(Error.PRICE_ERROR, FailureInfo.SET_COLLATERAL_FACTOR_WITHOUT_PRICE);
        }

        // Set market's collateral factor to new collateral factor, remember old value
        uint256 oldCollateralFactorMantissa = market.collateralFactorMantissa;
        market.collateralFactorMantissa = newCollateralFactorMantissa;

        // Emit event with asset, old collateral factor, and new collateral factor
        emit NewCollateralFactor(jToken, oldCollateralFactorMantissa, newCollateralFactorMantissa);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Sets liquidationIncentive
     * @dev Admin function to set liquidationIncentive
     * @param newLiquidationIncentiveMantissa New liquidationIncentive scaled by 1e18
     * @return uint 0=success, otherwise a failure. (See ErrorReporter for details)
     */
    function _setLiquidationIncentive(uint256 newLiquidationIncentiveMantissa) external returns (uint256) {
        // Check caller is admin
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_LIQUIDATION_INCENTIVE_OWNER_CHECK);
        }

        // Save current value for use in log
        uint256 oldLiquidationIncentiveMantissa = liquidationIncentiveMantissa;

        // Set liquidation incentive to new incentive
        liquidationIncentiveMantissa = newLiquidationIncentiveMantissa;

        // Emit event with old incentive, new incentive
        emit NewLiquidationIncentive(oldLiquidationIncentiveMantissa, newLiquidationIncentiveMantissa);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Add the market to the markets mapping and set it as listed
     * @dev Admin function to set isListed and add support for the market
     * @param jToken The address of the market (token) to list
     * @param version The version of the market (token)
     * @return uint 0=success, otherwise a failure. (See enum Error for details)
     */
    function _supportMarket(JToken jToken, Version version) external returns (uint256) {
        require(msg.sender == admin, "only admin may support market");
        require(!isMarketListed(address(jToken)), "market already listed");

        jToken.isJToken(); // Sanity check to make sure its really a JToken

        markets[address(jToken)] = Market({isListed: true, collateralFactorMantissa: 0, version: version});

        _addMarketInternal(address(jToken));

        emit MarketListed(jToken);

        return uint256(Error.NO_ERROR);
    }

    /**
     * @notice Remove the market from the markets mapping
     * @param jToken The address of the market (token) to delist
     */
    function _delistMarket(JToken jToken) external {
        require(msg.sender == admin, "only admin may delist market");
        require(isMarketListed(address(jToken)), "market not listed");
        require(jToken.totalSupply() == 0, "market not empty");

        jToken.isJToken(); // Sanity check to make sure its really a JToken

        delete markets[address(jToken)];

        for (uint256 i = 0; i < allMarkets.length; i++) {
            if (allMarkets[i] == jToken) {
                allMarkets[i] = allMarkets[allMarkets.length - 1];
                delete allMarkets[allMarkets.length - 1];
                allMarkets.length--;
                break;
            }
        }

        emit MarketDelisted(jToken);
    }

    function _addMarketInternal(address jToken) internal {
        for (uint256 i = 0; i < allMarkets.length; i++) {
            require(allMarkets[i] != JToken(jToken), "market already added");
        }
        allMarkets.push(JToken(jToken));
    }

    /**
     * @notice Admin function to change the Supply Cap Guardian
     * @param newSupplyCapGuardian The address of the new Supply Cap Guardian
     */
    function _setSupplyCapGuardian(address newSupplyCapGuardian) external {
        require(msg.sender == admin, "only admin can set supply cap guardian");

        // Save current value for inclusion in log
        address oldSupplyCapGuardian = supplyCapGuardian;

        // Store supplyCapGuardian with value newSupplyCapGuardian
        supplyCapGuardian = newSupplyCapGuardian;

        // Emit NewSupplyCapGuardian(OldSupplyCapGuardian, NewSupplyCapGuardian)
        emit NewSupplyCapGuardian(oldSupplyCapGuardian, newSupplyCapGuardian);
    }

    /**
     * @notice Set the given supply caps for the given jToken markets. Supplying that brings total supplys to or above supply cap will revert.
     * @dev Admin or supplyCapGuardian function to set the supply caps. A supply cap of 0 corresponds to unlimited supplying. If the total borrows
     *      already exceeded the cap, it will prevent anyone to borrow.
     * @param jTokens The addresses of the markets (tokens) to change the supply caps for
     * @param newSupplyCaps The new supply cap values in underlying to be set. A value of 0 corresponds to unlimited supplying.
     */
    function _setMarketSupplyCaps(JToken[] calldata jTokens, uint256[] calldata newSupplyCaps) external {
        require(
            msg.sender == admin || msg.sender == supplyCapGuardian,
            "only admin or supply cap guardian can set supply caps"
        );

        uint256 numMarkets = jTokens.length;
        uint256 numSupplyCaps = newSupplyCaps.length;

        require(numMarkets != 0 && numMarkets == numSupplyCaps, "invalid input");

        for (uint256 i = 0; i < numMarkets; i++) {
            supplyCaps[address(jTokens[i])] = newSupplyCaps[i];
            emit NewSupplyCap(jTokens[i], newSupplyCaps[i]);
        }
    }

    /**
     * @notice Set the given borrow caps for the given jToken markets. Borrowing that brings total borrows to or above borrow cap will revert.
     * @dev Admin or borrowCapGuardian function to set the borrow caps. A borrow cap of 0 corresponds to unlimited borrowing. If the total supplies
     *      already exceeded the cap, it will prevent anyone to mint.
     * @param jTokens The addresses of the markets (tokens) to change the borrow caps for
     * @param newBorrowCaps The new borrow cap values in underlying to be set. A value of 0 corresponds to unlimited borrowing.
     */
    function _setMarketBorrowCaps(JToken[] calldata jTokens, uint256[] calldata newBorrowCaps) external {
        require(
            msg.sender == admin || msg.sender == borrowCapGuardian,
            "only admin or borrow cap guardian can set borrow caps"
        );

        uint256 numMarkets = jTokens.length;
        uint256 numBorrowCaps = newBorrowCaps.length;

        require(numMarkets != 0 && numMarkets == numBorrowCaps, "invalid input");

        for (uint256 i = 0; i < numMarkets; i++) {
            borrowCaps[address(jTokens[i])] = newBorrowCaps[i];
            emit NewBorrowCap(jTokens[i], newBorrowCaps[i]);
        }
    }

    /**
     * @notice Admin function to change the Borrow Cap Guardian
     * @param newBorrowCapGuardian The address of the new Borrow Cap Guardian
     */
    function _setBorrowCapGuardian(address newBorrowCapGuardian) external {
        require(msg.sender == admin, "only admin can set borrow cap guardian");

        // Save current value for inclusion in log
        address oldBorrowCapGuardian = borrowCapGuardian;

        // Store borrowCapGuardian with value newBorrowCapGuardian
        borrowCapGuardian = newBorrowCapGuardian;

        // Emit NewBorrowCapGuardian(OldBorrowCapGuardian, NewBorrowCapGuardian)
        emit NewBorrowCapGuardian(oldBorrowCapGuardian, newBorrowCapGuardian);
    }

    /**
     * @notice Admin function to change the Pause Guardian
     * @param newPauseGuardian The address of the new Pause Guardian
     * @return uint 0=success, otherwise a failure. (See enum Error for details)
     */
    function _setPauseGuardian(address newPauseGuardian) public returns (uint256) {
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_PAUSE_GUARDIAN_OWNER_CHECK);
        }

        // Save current value for inclusion in log
        address oldPauseGuardian = pauseGuardian;

        // Store pauseGuardian with value newPauseGuardian
        pauseGuardian = newPauseGuardian;

        // Emit NewPauseGuardian(OldPauseGuardian, NewPauseGuardian)
        emit NewPauseGuardian(oldPauseGuardian, pauseGuardian);

        return uint256(Error.NO_ERROR);
    }

    function _setMintPaused(JToken jToken, bool state) public returns (bool) {
        require(isMarketListed(address(jToken)), "cannot pause a market that is not listed");
        require(msg.sender == pauseGuardian || msg.sender == admin, "only pause guardian and admin can pause");
        require(msg.sender == admin || state == true, "only admin can unpause");

        mintGuardianPaused[address(jToken)] = state;
        emit ActionPaused(jToken, "Mint", state);
        return state;
    }

    function _setBorrowPaused(JToken jToken, bool state) public returns (bool) {
        require(isMarketListed(address(jToken)), "cannot pause a market that is not listed");
        require(msg.sender == pauseGuardian || msg.sender == admin, "only pause guardian and admin can pause");
        require(msg.sender == admin || state == true, "only admin can unpause");

        borrowGuardianPaused[address(jToken)] = state;
        emit ActionPaused(jToken, "Borrow", state);
        return state;
    }

    function _setFlashloanPaused(JToken jToken, bool state) public returns (bool) {
        require(isMarketListed(address(jToken)), "cannot pause a market that is not listed");
        require(msg.sender == pauseGuardian || msg.sender == admin, "only pause guardian and admin can pause");
        require(msg.sender == admin || state == true, "only admin can unpause");

        flashloanGuardianPaused[address(jToken)] = state;
        emit ActionPaused(jToken, "Flashloan", state);
        return state;
    }

    function _setTransferPaused(bool state) public returns (bool) {
        require(msg.sender == pauseGuardian || msg.sender == admin, "only pause guardian and admin can pause");
        require(msg.sender == admin || state == true, "only admin can unpause");

        transferGuardianPaused = state;
        emit ActionPaused("Transfer", state);
        return state;
    }

    function _setSeizePaused(bool state) public returns (bool) {
        require(msg.sender == pauseGuardian || msg.sender == admin, "only pause guardian and admin can pause");
        require(msg.sender == admin || state == true, "only admin can unpause");

        seizeGuardianPaused = state;
        emit ActionPaused("Seize", state);
        return state;
    }

    function _become(Unitroller unitroller) public {
        require(msg.sender == unitroller.admin(), "only unitroller admin can change brains");
        require(unitroller._acceptImplementation() == 0, "change not authorized");
    }

    /**
     * @notice Sets whitelisted protocol's credit limit
     * @param protocol The address of the protocol
     * @param creditLimit The credit limit
     */
    function _setCreditLimit(address protocol, uint256 creditLimit) public {
        require(msg.sender == admin, "only admin can set protocol credit limit");

        creditLimits[protocol] = creditLimit;
        emit CreditLimitChanged(protocol, creditLimit);
    }

    /**
     * @notice Checks caller is admin, or this contract is becoming the new implementation
     */
    function adminOrInitializing() internal view returns (bool) {
        return msg.sender == admin || msg.sender == implementation;
    }

    /*** Reward distribution functions ***/

    /**
     * @notice Claim all the JOE/AVAX accrued by holder in all markets
     * @param holder The address to claim JOE/AVAX for
     */
    function claimReward(uint8 rewardType, address payable holder) public {
        RewardDistributor(rewardDistributor).claimReward(rewardType, holder);
    }

    /**
     * @notice Claim all the JOE/AVAX accrued by holder in the specified markets
     * @param holder The address to claim JOE/AVAX for
     * @param jTokens The list of markets to claim JOE/AVAX in
     */
    function claimReward(
        uint8 rewardType,
        address payable holder,
        JToken[] memory jTokens
    ) public {
        RewardDistributor(rewardDistributor).claimReward(rewardType, holder, jTokens);
    }

    /**
     * @notice Claim all JOE/AVAX  accrued by the holders
     * @param rewardType  0 = JOE, 1 = AVAX
     * @param holders The addresses to claim JOE/AVAX for
     * @param jTokens The list of markets to claim JOE/AVAX in
     * @param borrowers Whether or not to claim JOE/AVAX earned by borrowing
     * @param suppliers Whether or not to claim JOE/AVAX earned by supplying
     */
    function claimReward(
        uint8 rewardType,
        address payable[] memory holders,
        JToken[] memory jTokens,
        bool borrowers,
        bool suppliers
    ) public payable {
        RewardDistributor(rewardDistributor).claimReward(rewardType, holders, jTokens, borrowers, suppliers);
    }
}

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