Packed protocol version

l1-contracts/contracts/common/Config.sol

@@ -27,10 +27,11 @@ uint256 constant PRIORITY_OPERATION_L2_TX_TYPE = 255;
 /// @dev Denotes the type of the zkSync transaction that is used for system upgrades.
 uint256 constant SYSTEM_UPGRADE_L2_TX_TYPE = 254;
 
-/// @dev The maximal allowed difference between protocol versions in an upgrade. The 100 gap is needed
+/// @dev The maximal allowed difference between protocol minor versions in an upgrade. The 100 gap is needed
 /// in case a protocol version has been tested on testnet, but then not launched on mainnet, e.g.
 /// due to a bug found.
-uint256 constant MAX_ALLOWED_PROTOCOL_VERSION_DELTA = 100;
+/// We are allowed to jump at most 100 minor versions at a time. The major version is always expected to be 0.
+uint256 constant MAX_ALLOWED_MINOR_VERSION_DELTA = 100;
 
 /// @dev The amount of time in seconds the validator has to process the priority transaction
 /// NOTE: The constant is set to zero for the Alpha release period

l1-contracts/contracts/common/libraries/SemVer.sol

@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity 0.8.24;
+
+/// @dev The number of bits dedicated to the "patch" portion of the protocol version.
+/// This also defines the bit starting from which the "minor" part is located.
+uint256 constant SEMVER_MINOR_OFFSET = 32;
+
+/// @dev The number of bits dedicated to the "patch" and "minor" portions of the protocol version.
+/// This also defines the bit starting from which the "major" part is located.
+/// Note, that currently, only major version of "0" is supported.
+uint256 constant SEMVER_MAJOR_OFFSET = 64;
+
+/**
+ * @author Matter Labs
+ * @custom:security-contact security@matterlabs.dev
+ * @notice The library for managing SemVer for the protocol version.
+ */
+library SemVer {
+    /// @notice Unpacks the SemVer version from a single uint256 into major, minor and patch components.
+    /// @param _packedProtocolVersion The packed protocol version.
+    /// @return major The major version.
+    /// @return minor The minor version.
+    /// @return patch The patch version.
+    function unpackSemVer(
+        uint96 _packedProtocolVersion
+    ) internal pure returns (uint32 major, uint32 minor, uint32 patch) {
+        patch = uint32(_packedProtocolVersion);
+        minor = uint32(_packedProtocolVersion >> SEMVER_MINOR_OFFSET);
+        major = uint32(_packedProtocolVersion >> SEMVER_MAJOR_OFFSET);
+    }
+
+    /// @notice Packs the SemVer version from the major, minor and patch components into a single uint96.
+    /// @param _major The major version.
+    /// @param _minor The minor version.
+    /// @param _patch The patch version.
+    /// @return packedProtocolVersion The packed protocol version.
+    function packSemVer(
+        uint32 _major,
+        uint32 _minor,
+        uint32 _patch
+    ) internal pure returns (uint96 packedProtocolVersion) {
+        packedProtocolVersion =
+            uint96(_patch) |
+            (uint96(_minor) << SEMVER_MINOR_OFFSET) |
+            (uint96(_major) << SEMVER_MAJOR_OFFSET);
+    }
+}

l1-contracts/contracts/dev-contracts/test/CustomUpgradeTest.sol

@@ -28,16 +28,17 @@ contract CustomUpgradeTest is BaseZkSyncUpgrade {
     /// @notice The main function that will be called by the upgrade proxy.
     /// @param _proposedUpgrade The upgrade to be executed.
     function upgrade(ProposedUpgrade calldata _proposedUpgrade) public override returns (bytes32) {
-        _setNewProtocolVersion(_proposedUpgrade.newProtocolVersion);
+        (uint32 newMinorVersion, bool isPatchOnly) = _setNewProtocolVersion(_proposedUpgrade.newProtocolVersion);
         _upgradeL1Contract(_proposedUpgrade.l1ContractsUpgradeCalldata);
         _upgradeVerifier(_proposedUpgrade.verifier, _proposedUpgrade.verifierParams);
-        _setBaseSystemContracts(_proposedUpgrade.bootloaderHash, _proposedUpgrade.defaultAccountHash);
+        _setBaseSystemContracts(_proposedUpgrade.bootloaderHash, _proposedUpgrade.defaultAccountHash, isPatchOnly);
 
         bytes32 txHash;
         txHash = _setL2SystemContractUpgrade(
             _proposedUpgrade.l2ProtocolUpgradeTx,
             _proposedUpgrade.factoryDeps,
-            _proposedUpgrade.newProtocolVersion
+            newMinorVersion,
+            isPatchOnly
         );
 
         _postUpgrade(_proposedUpgrade.postUpgradeCalldata);

l1-contracts/contracts/state-transition/IStateTransitionManager.sol

@@ -131,4 +131,6 @@ interface IStateTransitionManager {
         uint256 _oldProtocolVersion,
         Diamond.DiamondCutData calldata _diamondCut
     ) external;
+
+    function getSemverProtocolVersion() external view returns (uint32, uint32, uint32);
 }

l1-contracts/contracts/state-transition/StateTransitionManager.sol

@@ -3,6 +3,7 @@
 pragma solidity 0.8.24;
 
 import {EnumerableMap} from "@openzeppelin/contracts/utils/structs/EnumerableMap.sol";
+import {SafeCast} from "@openzeppelin/contracts/utils/math/SafeCast.sol";
 
 import {Diamond} from "./libraries/Diamond.sol";
 import {DiamondProxy} from "./chain-deps/DiamondProxy.sol";
@@ -21,6 +22,7 @@ import {ProposedUpgrade} from "../upgrades/BaseZkSyncUpgrade.sol";
 import {ReentrancyGuard} from "../common/ReentrancyGuard.sol";
 import {REQUIRED_L2_GAS_PRICE_PER_PUBDATA, L2_TO_L1_LOG_SERIALIZE_SIZE, DEFAULT_L2_LOGS_TREE_ROOT_HASH, EMPTY_STRING_KECCAK, SYSTEM_UPGRADE_L2_TX_TYPE, PRIORITY_TX_MAX_GAS_LIMIT} from "../common/Config.sol";
 import {VerifierParams} from "./chain-interfaces/IVerifier.sol";
+import {SemVer} from "../common/libraries/SemVer.sol";
 
 /// @title State Transition Manager contract
 /// @author Matter Labs
@@ -47,7 +49,7 @@ contract StateTransitionManager is IStateTransitionManager, ReentrancyGuard, Own
     /// @dev The genesisUpgrade contract address, used to setChainId
     address public genesisUpgrade;
 
-    /// @dev The current protocolVersion
+    /// @dev The current packed protocolVersion. To access human-readable version, use `getSemverProtocolVersion` function.
     uint256 public protocolVersion;
 
     /// @dev The timestamp when protocolVersion can be last used
@@ -84,6 +86,12 @@ contract StateTransitionManager is IStateTransitionManager, ReentrancyGuard, Own
         _;
     }
 
+    /// @return The tuple of (major, minor, patch) protocol version.
+    function getSemverProtocolVersion() external view returns (uint32, uint32, uint32) {
+        // slither-disable-next-line unused-return
+        return SemVer.unpackSemVer(SafeCast.toUint96(protocolVersion));
+    }
+
     /// @notice Returns all the registered hyperchain addresses
     function getAllHyperchains() public view override returns (address[] memory chainAddresses) {
         uint256[] memory keys = hyperchainMap.keys();
@@ -280,6 +288,10 @@ contract StateTransitionManager is IStateTransitionManager, ReentrancyGuard, Own
         uint256[] memory uintEmptyArray;
         bytes[] memory bytesEmptyArray;
 
+        uint256 cachedProtocolVersion = protocolVersion;
+        // slither-disable-next-line unused-return
+        (, uint32 minorVersion, ) = SemVer.unpackSemVer(SafeCast.toUint96(cachedProtocolVersion));
+
         L2CanonicalTransaction memory l2ProtocolUpgradeTx = L2CanonicalTransaction({
             txType: SYSTEM_UPGRADE_L2_TX_TYPE,
             from: uint256(uint160(L2_FORCE_DEPLOYER_ADDR)),
@@ -289,8 +301,8 @@ contract StateTransitionManager is IStateTransitionManager, ReentrancyGuard, Own
             maxFeePerGas: uint256(0),
             maxPriorityFeePerGas: uint256(0),
             paymaster: uint256(0),
-            // Note, that the protocol version is used as "nonce" for system upgrade transactions
-            nonce: protocolVersion,
+            // Note, that the `minor` of the protocol version is used as "nonce" for system upgrade transactions
+            nonce: uint256(minorVersion),
             value: 0,
             reserved: [uint256(0), 0, 0, 0],
             data: systemContextCalldata,
@@ -314,7 +326,7 @@ contract StateTransitionManager is IStateTransitionManager, ReentrancyGuard, Own
             l1ContractsUpgradeCalldata: new bytes(0),
             postUpgradeCalldata: new bytes(0),
             upgradeTimestamp: 0,
-            newProtocolVersion: protocolVersion
+            newProtocolVersion: cachedProtocolVersion
         });
 
         Diamond.FacetCut[] memory emptyArray;
@@ -325,7 +337,7 @@ contract StateTransitionManager is IStateTransitionManager, ReentrancyGuard, Own
         });
 
         IAdmin(_chainContract).executeUpgrade(cutData);
-        emit SetChainIdUpgrade(_chainContract, l2ProtocolUpgradeTx, protocolVersion);
+        emit SetChainIdUpgrade(_chainContract, l2ProtocolUpgradeTx, cachedProtocolVersion);
     }
 
     /// @dev used to register already deployed hyperchain contracts

l1-contracts/contracts/state-transition/chain-deps/facets/Getters.sol

@@ -2,6 +2,8 @@
 
 pragma solidity 0.8.24;
 
+import {SafeCast} from "@openzeppelin/contracts/utils/math/SafeCast.sol";
+
 import {ZkSyncHyperchainBase} from "./ZkSyncHyperchainBase.sol";
 import {PubdataPricingMode} from "../ZkSyncHyperchainStorage.sol";
 import {VerifierParams} from "../../../state-transition/chain-interfaces/IVerifier.sol";
@@ -10,6 +12,7 @@ import {PriorityQueue, PriorityOperation} from "../../../state-transition/librar
 import {UncheckedMath} from "../../../common/libraries/UncheckedMath.sol";
 import {IGetters} from "../../chain-interfaces/IGetters.sol";
 import {ILegacyGetters} from "../../chain-interfaces/ILegacyGetters.sol";
+import {SemVer} from "../../../common/libraries/SemVer.sol";
 
 // While formally the following import is not used, it is needed to inherit documentation from it
 import {IZkSyncHyperchainBase} from "../../chain-interfaces/IZkSyncHyperchainBase.sol";
@@ -143,6 +146,12 @@ contract GettersFacet is ZkSyncHyperchainBase, IGetters, ILegacyGetters {
         return s.protocolVersion;
     }
 
+    /// @inheritdoc IGetters
+    function getSemverProtocolVersion() external view returns (uint32, uint32, uint32) {
+        // slither-disable-next-line unused-return
+        return SemVer.unpackSemVer(SafeCast.toUint96(s.protocolVersion));
+    }
+
     /// @inheritdoc IGetters
     function getL2SystemContractsUpgradeTxHash() external view returns (bytes32) {
         return s.l2SystemContractsUpgradeTxHash;

l1-contracts/contracts/state-transition/chain-interfaces/IGetters.sol

@@ -85,9 +85,12 @@ interface IGetters is IZkSyncHyperchainBase {
     /// @return Whether the diamond is frozen or not
     function isDiamondStorageFrozen() external view returns (bool);
 
-    /// @return The current protocol version
+    /// @return The current packed protocol version. To access human-readable version, use `getSemverProtocolVersion` function.
     function getProtocolVersion() external view returns (uint256);
 
+    /// @return The tuple of (major, minor, patch) protocol version.
+    function getSemverProtocolVersion() external view returns (uint32, uint32, uint32);
+
     /// @return The upgrade system contract transaction hash, 0 if the upgrade is not initialized
     function getL2SystemContractsUpgradeTxHash() external view returns (bytes32);