maint(ctb): cleanup and comments for SystemConfig

Minor cleanup and comment updates for the SystemConfig contract. Some
comments were missing and functions weren't entirely in the right order.

.changeset/rotten-foxes-grab.md

+---
+'@eth-optimism/contracts-bedrock': patch
+---
+
+Minor comment updates and cleanup to the SystemConfig contract.

op-bindings/bindings/systemconfig.go

@@ -31,7 +31,7 @@ var (
 // SystemConfigMetaData contains all meta data concerning the SystemConfig contract.
 var SystemConfigMetaData = &bind.MetaData{
 	ABI: "[{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_owner\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_overhead\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_scalar\",\"type\":\"uint256\"},{\"internalType\":\"bytes32\",\"name\":\"_batcherHash\",\"type\":\"bytes32\"},{\"internalType\":\"uint64\",\"name\":\"_gasLimit\",\"type\":\"uint64\"},{\"internalType\":\"address\",\"name\":\"_unsafeBlockSigner\",\"type\":\"address\"}],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"version\",\"type\":\"uint256\"},{\"indexed\":true,\"internalType\":\"enumSystemConfig.UpdateType\",\"name\":\"updateType\",\"type\":\"uint8\"},{\"indexed\":false,\"internalType\":\"bytes\",\"name\":\"data\",\"type\":\"bytes\"}],\"name\":\"ConfigUpdate\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"uint8\",\"name\":\"version\",\"type\":\"uint8\"}],\"name\":\"Initialized\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"previousOwner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnershipTransferred\",\"type\":\"event\"},{\"inputs\":[],\"name\":\"MINIMUM_GAS_LIMIT\",\"outputs\":[{\"internalType\":\"uint64\",\"name\":\"\",\"type\":\"uint64\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"UNSAFE_BLOCK_SIGNER_SLOT\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"VERSION\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"batcherHash\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"gasLimit\",\"outputs\":[{\"internalType\":\"uint64\",\"name\":\"\",\"type\":\"uint64\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_owner\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_overhead\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_scalar\",\"type\":\"uint256\"},{\"internalType\":\"bytes32\",\"name\":\"_batcherHash\",\"type\":\"bytes32\"},{\"internalType\":\"uint64\",\"name\":\"_gasLimit\",\"type\":\"uint64\"},{\"internalType\":\"address\",\"name\":\"_unsafeBlockSigner\",\"type\":\"address\"}],\"name\":\"initialize\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"overhead\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"owner\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"renounceOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"scalar\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_batcherHash\",\"type\":\"bytes32\"}],\"name\":\"setBatcherHash\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"_overhead\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_scalar\",\"type\":\"uint256\"}],\"name\":\"setGasConfig\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint64\",\"name\":\"_gasLimit\",\"type\":\"uint64\"}],\"name\":\"setGasLimit\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_unsafeBlockSigner\",\"type\":\"address\"}],\"name\":\"setUnsafeBlockSigner\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"transferOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"unsafeBlockSigner\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"version\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"}]",
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+	Bin: 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 }
 
 // SystemConfigABI is the input ABI used to generate the binding from.

packages/contracts-bedrock/contracts/L1/SystemConfig.sol

@@ -79,13 +79,14 @@ contract SystemConfig is OwnableUpgradeable, Semver {
     event ConfigUpdate(uint256 indexed version, UpdateType indexed updateType, bytes data);
 
     /**
-     * @custom:semver 1.0.0
+     * @custom:semver 1.0.1
      *
      * @param _owner             Initial owner of the contract.
      * @param _overhead          Initial overhead value.
      * @param _scalar            Initial scalar value.
      * @param _batcherHash       Initial batcher hash.
      * @param _gasLimit          Initial gas limit.
+     * @param _unsafeBlockSigner Initial unsafe block signer address.
      */
     constructor(
         address _owner,
@@ -94,7 +95,7 @@ contract SystemConfig is OwnableUpgradeable, Semver {
         bytes32 _batcherHash,
         uint64 _gasLimit,
         address _unsafeBlockSigner
-    ) Semver(1, 0, 0) {
+    ) Semver(1, 0, 1) {
         initialize(_owner, _overhead, _scalar, _batcherHash, _gasLimit, _unsafeBlockSigner);
     }
 
@@ -106,6 +107,7 @@ contract SystemConfig is OwnableUpgradeable, Semver {
      * @param _scalar            Initial scalar value.
      * @param _batcherHash       Initial batcher hash.
      * @param _gasLimit          Initial gas limit.
+     * @param _unsafeBlockSigner Initial unsafe block signer address.
      */
     function initialize(
         address _owner,
@@ -126,11 +128,14 @@ contract SystemConfig is OwnableUpgradeable, Semver {
     }
 
     /**
-     * @notice High level getter for the unsafe block signer address.
-     *         Unsafe blocks can be propagated across the p2p network
-     *         if they are signed by the key corresponding to this address.
+     * @notice High level getter for the unsafe block signer address. Unsafe blocks can be
+     *         propagated across the p2p network if they are signed by the key corresponding to
+     *         this address.
+     *
+     * @return Address of the unsafe block signer.
      */
-    function unsafeBlockSigner() public view returns (address) {
+    // solhint-disable-next-line ordering
+    function unsafeBlockSigner() external view returns (address) {
         address addr;
         bytes32 slot = UNSAFE_BLOCK_SIGNER_SLOT;
         assembly {
@@ -139,12 +144,23 @@ contract SystemConfig is OwnableUpgradeable, Semver {
         return addr;
     }
 
+    /**
+     * @notice Updates the unsafe block signer address.
+     *
+     * @param _unsafeBlockSigner New unsafe block signer address.
+     */
+    function setUnsafeBlockSigner(address _unsafeBlockSigner) external onlyOwner {
+        _setUnsafeBlockSigner(_unsafeBlockSigner);
+
+        bytes memory data = abi.encode(_unsafeBlockSigner);
+        emit ConfigUpdate(VERSION, UpdateType.UNSAFE_BLOCK_SIGNER, data);
+    }
+
     /**
      * @notice Updates the batcher hash.
      *
      * @param _batcherHash New batcher hash.
      */
-    // solhint-disable-next-line ordering
     function setBatcherHash(bytes32 _batcherHash) external onlyOwner {
         batcherHash = _batcherHash;
 
@@ -166,27 +182,6 @@ contract SystemConfig is OwnableUpgradeable, Semver {
         emit ConfigUpdate(VERSION, UpdateType.GAS_CONFIG, data);
     }
 
-    function setUnsafeBlockSigner(address _unsafeBlockSigner) external onlyOwner {
-        _setUnsafeBlockSigner(_unsafeBlockSigner);
-
-        bytes memory data = abi.encode(_unsafeBlockSigner);
-        emit ConfigUpdate(VERSION, UpdateType.UNSAFE_BLOCK_SIGNER, data);
-    }
-
-    /**
-     * @notice Low level setter for the unsafe block signer address.
-     *         This function exists to deduplicate code around storing
-     *         the unsafeBlockSigner address in storage.
-     *
-     * @param _unsafeBlockSigner New unsafeBlockSigner value
-     */
-    function _setUnsafeBlockSigner(address _unsafeBlockSigner) internal {
-        bytes32 slot = UNSAFE_BLOCK_SIGNER_SLOT;
-        assembly {
-            sstore(slot, _unsafeBlockSigner)
-        }
-    }
-
     /**
      * @notice Updates the L2 gas limit.
      *
@@ -199,4 +194,17 @@ contract SystemConfig is OwnableUpgradeable, Semver {
         bytes memory data = abi.encode(_gasLimit);
         emit ConfigUpdate(VERSION, UpdateType.GAS_LIMIT, data);
     }
+
+    /**
+     * @notice Low level setter for the unsafe block signer address. This function exists to
+     *         deduplicate code around storing the unsafeBlockSigner address in storage.
+     *
+     * @param _unsafeBlockSigner New unsafeBlockSigner value.
+     */
+    function _setUnsafeBlockSigner(address _unsafeBlockSigner) internal {
+        bytes32 slot = UNSAFE_BLOCK_SIGNER_SLOT;
+        assembly {
+            sstore(slot, _unsafeBlockSigner)
+        }
+    }
 }