openzeppelin-contracts/certora/applyHarness.patch

diff -ruN access/AccessControl.sol access/AccessControl.sol
--- access/AccessControl.sol	2022-09-27 10:26:58.548890299 +0200
+++ access/AccessControl.sol	2022-09-27 17:51:32.011301116 +0200
@@ -93,7 +93,7 @@
      *
      * _Available since v4.6._
      */
-    function _checkRole(bytes32 role) internal view virtual {
+    function _checkRole(bytes32 role) public view virtual { // HARNESS: internal -> public
         _checkRole(role, _msgSender());
     }

diff -ruN governance/extensions/GovernorCountingSimple.sol governance/extensions/GovernorCountingSimple.sol
--- governance/extensions/GovernorCountingSimple.sol	2022-09-27 10:26:58.548890299 +0200
+++ governance/extensions/GovernorCountingSimple.sol	2022-09-27 17:51:32.011301116 +0200
@@ -27,7 +27,7 @@
         mapping(address => bool) hasVoted;
     }

-    mapping(uint256 => ProposalVote) private _proposalVotes;
+    mapping(uint256 => ProposalVote) internal _proposalVotes; // HARNESS: private -> internal

     /**
      * @dev See {IGovernor-COUNTING_MODE}.
diff -ruN governance/extensions/GovernorPreventLateQuorum.sol governance/extensions/GovernorPreventLateQuorum.sol
--- governance/extensions/GovernorPreventLateQuorum.sol	2022-08-31 13:44:36.377724869 +0200
+++ governance/extensions/GovernorPreventLateQuorum.sol	2022-09-27 17:51:32.011301116 +0200
@@ -21,8 +21,8 @@
     using SafeCast for uint256;
     using Timers for Timers.BlockNumber;

-    uint64 private _voteExtension;
-    mapping(uint256 => Timers.BlockNumber) private _extendedDeadlines;
+    uint64 internal _voteExtension; // HARNESS: private -> internal
+    mapping(uint256 => Timers.BlockNumber) internal _extendedDeadlines; // HARNESS: private -> internal

     /// @dev Emitted when a proposal deadline is pushed back due to reaching quorum late in its voting period.
     event ProposalExtended(uint256 indexed proposalId, uint64 extendedDeadline);
diff -ruN governance/Governor.sol governance/Governor.sol
--- governance/Governor.sol	2022-09-29 10:07:27.126075551 +0200
+++ governance/Governor.sol	2022-09-27 17:51:32.014634743 +0200
@@ -44,7 +44,7 @@

     string private _name;

-    mapping(uint256 => ProposalCore) private _proposals;
+    mapping(uint256 => ProposalCore) internal _proposals; // HARNESS: private -> internal

     // This queue keeps track of the governor operating on itself. Calls to functions protected by the
     // {onlyGovernance} modifier needs to be whitelisted in this queue. Whitelisting is set in {_beforeExecute},
diff -ruN governance/TimelockController.sol governance/TimelockController.sol
--- governance/TimelockController.sol	2022-09-29 10:07:27.126075551 +0200
+++ governance/TimelockController.sol	2022-09-27 17:51:32.014634743 +0200
@@ -28,10 +28,10 @@
     bytes32 public constant PROPOSER_ROLE = keccak256("PROPOSER_ROLE");
     bytes32 public constant EXECUTOR_ROLE = keccak256("EXECUTOR_ROLE");
     bytes32 public constant CANCELLER_ROLE = keccak256("CANCELLER_ROLE");
-    uint256 internal constant _DONE_TIMESTAMP = uint256(1);
+    uint256 public constant _DONE_TIMESTAMP = uint256(1); // HARNESS: internal -> public

     mapping(bytes32 => uint256) private _timestamps;
-    uint256 private _minDelay;
+    uint256 public _minDelay; // HARNESS: private -> public

     /**
      * @dev Emitted when a call is scheduled as part of operation `id`.
diff -ruN governance/utils/Votes.sol governance/utils/Votes.sol
--- governance/utils/Votes.sol	2022-09-27 10:26:58.548890299 +0200
+++ governance/utils/Votes.sol	2022-09-27 17:51:32.014634743 +0200
@@ -35,7 +35,25 @@
     bytes32 private constant _DELEGATION_TYPEHASH =
         keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");

-    mapping(address => address) private _delegation;
+    // HARNESS : Hooks cannot access any information from Checkpoints yet, so I am also updating votes and fromBlock in this struct
+    struct Ckpt {
+        uint32 fromBlock;
+        uint224 votes;
+    }
+    mapping(address => Ckpt) public _checkpoints;
+
+    // HARNESSED getters
+    function numCheckpoints(address account) public view returns (uint32) {
+        return SafeCast.toUint32(_delegateCheckpoints[account]._checkpoints.length);
+    }
+    function ckptFromBlock(address account, uint32 pos) public view returns (uint32) {
+        return _delegateCheckpoints[account]._checkpoints[pos]._blockNumber;
+    }
+    function ckptVotes(address account, uint32 pos) public view returns (uint224) {
+        return _delegateCheckpoints[account]._checkpoints[pos]._value;
+    }
+
+    mapping(address => address) public _delegation; // HARNESS: private -> public
     mapping(address => Checkpoints.History) private _delegateCheckpoints;
     Checkpoints.History private _totalCheckpoints;

@@ -124,7 +142,7 @@
      *
      * Emits events {DelegateChanged} and {DelegateVotesChanged}.
      */
-    function _delegate(address account, address delegatee) internal virtual {
+    function _delegate(address account, address delegatee) public virtual { // HARNESS: internal -> public
         address oldDelegate = delegates(account);
         _delegation[account] = delegatee;

@@ -142,10 +160,10 @@
         uint256 amount
     ) internal virtual {
         if (from == address(0)) {
-            _totalCheckpoints.push(_add, amount);
+            _totalCheckpoints.push(_totalCheckpoints.latest() + amount); // Harnessed to remove function pointers
         }
         if (to == address(0)) {
-            _totalCheckpoints.push(_subtract, amount);
+            _totalCheckpoints.push(_totalCheckpoints.latest() - amount); // Harnessed to remove function pointers
         }
         _moveDelegateVotes(delegates(from), delegates(to), amount);
     }
@@ -160,11 +178,13 @@
     ) private {
         if (from != to && amount > 0) {
             if (from != address(0)) {
-                (uint256 oldValue, uint256 newValue) = _delegateCheckpoints[from].push(_subtract, amount);
+                (uint256 oldValue, uint256 newValue) = _delegateCheckpoints[from].push(_delegateCheckpoints[from].latest() - amount); // Harnessed to remove function pointers
+                _checkpoints[from] = Ckpt({fromBlock: SafeCast.toUint32(block.number), votes: SafeCast.toUint224(newValue)}); // HARNESS
                 emit DelegateVotesChanged(from, oldValue, newValue);
             }
             if (to != address(0)) {
-                (uint256 oldValue, uint256 newValue) = _delegateCheckpoints[to].push(_add, amount);
+                (uint256 oldValue, uint256 newValue) = _delegateCheckpoints[to].push(_delegateCheckpoints[to].latest() + amount); // Harnessed to remove function pointers
+                _checkpoints[to] = Ckpt({fromBlock: SafeCast.toUint32(block.number), votes: SafeCast.toUint224(newValue)}); // HARNESS
                 emit DelegateVotesChanged(to, oldValue, newValue);
             }
         }
@@ -207,5 +227,5 @@
     /**
      * @dev Must return the voting units held by an account.
      */
-    function _getVotingUnits(address) internal view virtual returns (uint256);
+    function _getVotingUnits(address) public virtual returns (uint256); // HARNESS: internal -> public
 }
diff -ruN mocks/SafeERC20Helper.sol mocks/SafeERC20Helper.sol
--- mocks/SafeERC20Helper.sol	2022-09-26 19:10:21.166619395 +0200
+++ mocks/SafeERC20Helper.sol	2022-09-27 17:51:32.014634743 +0200
@@ -4,7 +4,6 @@

 import "../utils/Context.sol";
 import "../token/ERC20/IERC20.sol";
-import "../token/ERC20/extensions/draft-ERC20Permit.sol";
 import "../token/ERC20/utils/SafeERC20.sol";

 contract ERC20ReturnFalseMock is Context {
@@ -106,42 +105,43 @@
     }
 }

-contract ERC20PermitNoRevertMock is
-    ERC20("ERC20PermitNoRevertMock", "ERC20PermitNoRevertMock"),
-    ERC20Permit("ERC20PermitNoRevertMock")
-{
-    function getChainId() external view returns (uint256) {
-        return block.chainid;
-    }
-
-    function permitThatMayRevert(
-        address owner,
-        address spender,
-        uint256 value,
-        uint256 deadline,
-        uint8 v,
-        bytes32 r,
-        bytes32 s
-    ) public {
-        super.permit(owner, spender, value, deadline, v, r, s);
-    }
-
-    function permit(
-        address owner,
-        address spender,
-        uint256 value,
-        uint256 deadline,
-        uint8 v,
-        bytes32 r,
-        bytes32 s
-    ) public override {
-        try this.permitThatMayRevert(owner, spender, value, deadline, v, r, s) {
-            // do nothing
-        } catch {
-            // do nothing
-        }
-    }
-}
+// Harness remove ?
+// contract ERC20PermitNoRevertMock is
+//     ERC20("ERC20PermitNoRevertMock", "ERC20PermitNoRevertMock"),
+//     ERC20Permit("ERC20PermitNoRevertMock")
+// {
+//     function getChainId() external view returns (uint256) {
+//         return block.chainid;
+//     }
+
+//     function permitThatMayRevert(
+//         address owner,
+//         address spender,
+//         uint256 value,
+//         uint256 deadline,
+//         uint8 v,
+//         bytes32 r,
+//         bytes32 s
+//     ) public {
+//         super.permit(owner, spender, value, deadline, v, r, s);
+//     }
+
+//     function permit(
+//         address owner,
+//         address spender,
+//         uint256 value,
+//         uint256 deadline,
+//         uint8 v,
+//         bytes32 r,
+//         bytes32 s
+//     ) public override {
+//         try this.permitThatMayRevert(owner, spender, value, deadline, v, r, s) {
+//             // do nothing
+//         } catch {
+//             // do nothing
+//         }
+//     }
+// }

 contract SafeERC20Wrapper is Context {
     using SafeERC20 for IERC20;
diff -ruN proxy/utils/Initializable.sol proxy/utils/Initializable.sol
--- proxy/utils/Initializable.sol	2022-09-29 10:07:27.126075551 +0200
+++ proxy/utils/Initializable.sol	2022-09-27 17:51:32.014634743 +0200
@@ -59,12 +59,12 @@
      * @dev Indicates that the contract has been initialized.
      * @custom:oz-retyped-from bool
      */
-    uint8 private _initialized;
+    uint8 internal _initialized; // HARNESS: private -> internal

     /**
      * @dev Indicates that the contract is in the process of being initialized.
      */
-    bool private _initializing;
+    bool internal _initializing; // HARNESS: private -> internal

     /**
      * @dev Triggered when the contract has been initialized or reinitialized.
diff -ruN token/ERC1155/ERC1155.sol token/ERC1155/ERC1155.sol
--- token/ERC1155/ERC1155.sol	2022-09-27 10:26:58.548890299 +0200
+++ token/ERC1155/ERC1155.sol	2022-09-27 17:51:32.014634743 +0200
@@ -21,7 +21,7 @@
     using Address for address;

     // Mapping from token ID to account balances
-    mapping(uint256 => mapping(address => uint256)) private _balances;
+    mapping(uint256 => mapping(address => uint256)) internal _balances; // HARNESS: private -> internal

     // Mapping from account to operator approvals
     mapping(address => mapping(address => bool)) private _operatorApprovals;
@@ -471,7 +471,7 @@
         uint256 id,
         uint256 amount,
         bytes memory data
-    ) private {
+    ) public { // HARNESS: private -> public
         if (to.isContract()) {
             try IERC1155Receiver(to).onERC1155Received(operator, from, id, amount, data) returns (bytes4 response) {
                 if (response != IERC1155Receiver.onERC1155Received.selector) {
@@ -492,7 +492,7 @@
         uint256[] memory ids,
         uint256[] memory amounts,
         bytes memory data
-    ) private {
+    ) public { // HARNESS: private -> public
         if (to.isContract()) {
             try IERC1155Receiver(to).onERC1155BatchReceived(operator, from, ids, amounts, data) returns (
                 bytes4 response
diff -ruN token/ERC20/ERC20.sol token/ERC20/ERC20.sol
--- token/ERC20/ERC20.sol	2022-09-27 10:26:58.548890299 +0200
+++ token/ERC20/ERC20.sol	2022-09-29 10:09:07.479688477 +0200
@@ -256,7 +256,7 @@
      *
      * - `account` cannot be the zero address.
      */
-    function _mint(address account, uint256 amount) internal virtual {
+    function _mint(address account, uint256 amount) public virtual { // HARNESS: internal -> public
         require(account != address(0), "ERC20: mint to the zero address");

         _beforeTokenTransfer(address(0), account, amount);
@@ -282,7 +282,7 @@
      * - `account` cannot be the zero address.
      * - `account` must have at least `amount` tokens.
      */
-    function _burn(address account, uint256 amount) internal virtual {
+    function _burn(address account, uint256 amount) public virtual { // HARNESS: internal -> public
         require(account != address(0), "ERC20: burn from the zero address");

         _beforeTokenTransfer(account, address(0), amount);
diff -ruN token/ERC20/extensions/ERC20Capped.sol token/ERC20/extensions/ERC20Capped.sol
--- token/ERC20/extensions/ERC20Capped.sol	2022-08-31 13:44:36.381058287 +0200
+++ token/ERC20/extensions/ERC20Capped.sol	2022-09-29 10:09:41.376517581 +0200
@@ -30,7 +30,7 @@
     /**
      * @dev See {ERC20-_mint}.
      */
-    function _mint(address account, uint256 amount) internal virtual override {
+    function _mint(address account, uint256 amount) public virtual override { // HARNESS: internal -> public
         require(ERC20.totalSupply() + amount <= cap(), "ERC20Capped: cap exceeded");
         super._mint(account, amount);
     }
diff -ruN token/ERC20/extensions/ERC20FlashMint.sol token/ERC20/extensions/ERC20FlashMint.sol
--- token/ERC20/extensions/ERC20FlashMint.sol	2022-09-29 10:07:27.126075551 +0200
+++ token/ERC20/extensions/ERC20FlashMint.sol	2022-09-27 17:51:32.014634743 +0200
@@ -51,9 +51,11 @@
         // silence warning about unused variable without the addition of bytecode.
         token;
         amount;
-        return 0;
+        return fee; // HARNESS: made "return" nonzero
     }

+    uint256 public fee; // HARNESS: added it to simulate random fee amount
+
     /**
      * @dev Returns the receiver address of the flash fee. By default this
      * implementation returns the address(0) which means the fee amount will be burnt.
diff -ruN token/ERC20/extensions/ERC20Votes.sol token/ERC20/extensions/ERC20Votes.sol
--- token/ERC20/extensions/ERC20Votes.sol	2022-09-27 10:26:58.548890299 +0200
+++ token/ERC20/extensions/ERC20Votes.sol	2022-09-29 10:09:45.489874234 +0200
@@ -33,8 +33,8 @@
     bytes32 private constant _DELEGATION_TYPEHASH =
         keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");

-    mapping(address => address) private _delegates;
-    mapping(address => Checkpoint[]) private _checkpoints;
+    mapping(address => address) public _delegates; // HARNESS: private -> public
+    mapping(address => Checkpoint[]) public _checkpoints;  // HARNESS: private -> public
     Checkpoint[] private _totalSupplyCheckpoints;

     /**
@@ -165,27 +165,27 @@
     /**
      * @dev Maximum token supply. Defaults to `type(uint224).max` (2^224^ - 1).
      */
-    function _maxSupply() internal view virtual returns (uint224) {
+    function _maxSupply() public view virtual returns (uint224) {  // HARNESS: internal -> public
         return type(uint224).max;
     }

     /**
      * @dev Snapshots the totalSupply after it has been increased.
      */
-    function _mint(address account, uint256 amount) internal virtual override {
+    function _mint(address account, uint256 amount) public virtual override { // HARNESS: internal -> public
         super._mint(account, amount);
         require(totalSupply() <= _maxSupply(), "ERC20Votes: total supply risks overflowing votes");

-        _writeCheckpoint(_totalSupplyCheckpoints, _add, amount);
+        _writeCheckpointAdd(_totalSupplyCheckpoints, amount); // HARNESS: new version without pointer
     }

     /**
      * @dev Snapshots the totalSupply after it has been decreased.
      */
-    function _burn(address account, uint256 amount) internal virtual override {
+    function _burn(address account, uint256 amount) public virtual override { // HARNESS: internal -> public (to comply with the ERC20 harness)
         super._burn(account, amount);

-        _writeCheckpoint(_totalSupplyCheckpoints, _subtract, amount);
+        _writeCheckpointSub(_totalSupplyCheckpoints, amount); // HARNESS: new version without pointer
     }

     /**
@@ -208,7 +208,7 @@
      *
      * Emits events {DelegateChanged} and {DelegateVotesChanged}.
      */
-    function _delegate(address delegator, address delegatee) internal virtual {
+    function _delegate(address delegator, address delegatee) public virtual { // HARNESS: internal -> public
         address currentDelegate = delegates(delegator);
         uint256 delegatorBalance = balanceOf(delegator);
         _delegates[delegator] = delegatee;
@@ -225,12 +225,13 @@
     ) private {
         if (src != dst && amount > 0) {
             if (src != address(0)) {
-                (uint256 oldWeight, uint256 newWeight) = _writeCheckpoint(_checkpoints[src], _subtract, amount);
+                (uint256 oldWeight, uint256 newWeight) = _writeCheckpointSub(_checkpoints[src], amount); // HARNESS: new version without pointer
+
                 emit DelegateVotesChanged(src, oldWeight, newWeight);
             }

             if (dst != address(0)) {
-                (uint256 oldWeight, uint256 newWeight) = _writeCheckpoint(_checkpoints[dst], _add, amount);
+                (uint256 oldWeight, uint256 newWeight) = _writeCheckpointAdd(_checkpoints[dst], amount); // HARNESS: new version without pointer
                 emit DelegateVotesChanged(dst, oldWeight, newWeight);
             }
         }
@@ -255,6 +256,55 @@
         }
     }

+    // HARNESS: split _writeCheckpoint() to two functions as a workaround for function pointers that cannot be managed by the tool
+    function _writeCheckpointAdd(
+        Checkpoint[] storage ckpts,
+        uint256 delta
+    ) private returns (uint256 oldWeight, uint256 newWeight) {
+        uint256 pos = ckpts.length;
+        oldWeight = pos == 0 ? 0 : ckpts[pos - 1].votes;
+        newWeight = _add(oldWeight, delta);
+
+        if (pos > 0 && ckpts[pos - 1].fromBlock == block.number) {
+            ckpts[pos - 1].votes = SafeCast.toUint224(newWeight);
+        } else {
+            ckpts.push(Checkpoint({fromBlock: SafeCast.toUint32(block.number), votes: SafeCast.toUint224(newWeight)}));
+        }
+    }
+
+    function _writeCheckpointSub(
+        Checkpoint[] storage ckpts,
+        uint256 delta
+    ) private returns (uint256 oldWeight, uint256 newWeight) {
+        uint256 pos = ckpts.length;
+        oldWeight = pos == 0 ? 0 : ckpts[pos - 1].votes;
+        newWeight = _subtract(oldWeight, delta);
+
+        if (pos > 0 && ckpts[pos - 1].fromBlock == block.number) {
+            ckpts[pos - 1].votes = SafeCast.toUint224(newWeight);
+        } else {
+            ckpts.push(Checkpoint({fromBlock: SafeCast.toUint32(block.number), votes: SafeCast.toUint224(newWeight)}));
+        }
+    }
+
+    // backup of original function
+    //
+    // function _writeCheckpoint(
+    //     Checkpoint[] storage ckpts,
+    //     function(uint256, uint256) view returns (uint256) op,
+    //     uint256 delta
+    // ) private returns (uint256 oldWeight, uint256 newWeight) {
+    //     uint256 pos = ckpts.length;
+    //     oldWeight = pos == 0 ? 0 : ckpts[pos - 1].votes;
+    //     newWeight = op(oldWeight, delta);
+    //
+    //     if (pos > 0 && ckpts[pos - 1].fromBlock == block.number) {
+    //         ckpts[pos - 1].votes = SafeCast.toUint224(newWeight);
+    //     } else {
+    //         ckpts.push(Checkpoint({fromBlock: SafeCast.toUint32(block.number), votes: SafeCast.toUint224(newWeight)}));
+    //     }
+    // }
+
     function _add(uint256 a, uint256 b) private pure returns (uint256) {
         return a + b;
     }
diff -ruN token/ERC20/extensions/ERC20Wrapper.sol token/ERC20/extensions/ERC20Wrapper.sol
--- token/ERC20/extensions/ERC20Wrapper.sol	2022-08-31 13:44:36.381058287 +0200
+++ token/ERC20/extensions/ERC20Wrapper.sol	2022-09-28 11:25:39.319711517 +0200
@@ -55,7 +55,7 @@
      * @dev Mint wrapped token to cover any underlyingTokens that would have been transferred by mistake. Internal
      * function that can be exposed with access control if desired.
      */
-    function _recover(address account) internal virtual returns (uint256) {
+    function _recover(address account) public virtual returns (uint256) { // HARNESS: internal -> public
         uint256 value = underlying.balanceOf(address(this)) - totalSupply();
         _mint(account, value);
         return value;
diff -ruN token/ERC721/extensions/draft-ERC721Votes.sol token/ERC721/extensions/draft-ERC721Votes.sol
--- token/ERC721/extensions/draft-ERC721Votes.sol	2022-09-29 10:07:27.126075551 +0200
+++ token/ERC721/extensions/draft-ERC721Votes.sol	2022-09-27 17:51:32.014634743 +0200
@@ -49,7 +49,7 @@
     /**
      * @dev Returns the balance of `account`.
      */
-    function _getVotingUnits(address account) internal view virtual override returns (uint256) {
+    function _getVotingUnits(address account) public view virtual override returns (uint256) { // HARNESS: internal -> public
         return balanceOf(account);
     }
 }