include dependency instance factory

contracts/deploy/DelegatedCall.sol

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+pragma solidity ^0.4.21;
+
+
+/**
+ * @title DelegatedCall
+ * @author Ricardo Guilherme Schmidt (Status Research & Development GmbH) 
+ * @dev Abstract contract that delegates calls by `delegated` modifier to result of `targetDelegatedCall()`
+ *      Important to avoid overwriting wrong storage pointers is that never define storage to this contract
+ */
+contract DelegatedCall {
+    /**
+     * @dev delegates the call of this function
+     */
+    modifier delegated {
+        //require successfull delegate call to remote `_target()`
+        require(targetDelegatedCall().delegatecall(msg.data)); 
+        assembly {
+            let outSize := returndatasize 
+            let outDataPtr := mload(0x40) //load memory
+            returndatacopy(outDataPtr, 0, outSize) //copy last return into pointer
+            return(outDataPtr, outSize) 
+        }
+        assert(false); //should never reach here
+        _; //never will execute local logic
+    }
+
+    /**
+     * @dev defines the address for delegation of calls
+     */
+    function targetDelegatedCall()
+        internal
+        view
+        returns(address);
+
+}

contracts/deploy/Factory.sol

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+pragma solidity ^0.4.17;
+
+import "../common/Controlled.sol";
+
+contract Factory is Controlled {
+
+    event NewKernel(address newKernel, bytes32 codeHash);
+
+    struct Version {
+        uint256 blockNumber;
+        uint256 timestamp;
+        address kernel;
+        bytes32 codeHash;
+    }
+
+    mapping (address => uint256) versionMap;
+
+    Version[] versionLog;
+    uint256 latestUpdate;
+    address latestKernel;
+
+    function Factory(address _kernel)
+        public 
+    {
+        _setKernel(_kernel);
+    }
+
+    function setKernel(address _kernel)
+        external 
+        onlyController
+    {
+        _setKernel(_kernel);
+    }
+
+    function getVersion(uint256 index)
+        public
+        view
+        returns(
+            uint256 blockNumber,
+            uint256 timestamp,
+            address kernel,
+            bytes32 codeHash
+        )
+    {
+        return (
+            versionLog[index].blockNumber, 
+            versionLog[index].timestamp, 
+            versionLog[index].kernel, 
+            versionLog[index].codeHash
+        );
+    }
+
+    function getCodeHash(address _addr) 
+        public 
+        view 
+        returns (bytes32 codeHash) 
+    {
+        bytes memory o_code;
+        uint size;
+        assembly {
+            // retrieve the size of the code, this needs assembly
+            size := extcodesize(_addr)
+        }
+        require (size > 0);
+        assembly {
+            // allocate output byte array - this could also be done without assembly
+            // by using o_code = new bytes(size)
+            o_code := mload(0x40)
+            // new "memory end" including padding
+            mstore(0x40, add(o_code, and(add(add(size, 0x20), 0x1f), not(0x1f))))
+            // store length in memory
+            mstore(o_code, size)
+            // actually retrieve the code, this needs assembly
+            extcodecopy(_addr, add(o_code, 0x20), 0, size)
+        }
+        codeHash = keccak256(o_code);
+    }
+
+    function _setKernel(address _kernel) 
+        internal
+    {
+        require(_kernel != latestKernel);
+        bytes32 _codeHash = getCodeHash(_kernel);
+        versionMap[_kernel] = versionLog.length;
+        versionLog.push(Version({blockNumber: block.number, timestamp: block.timestamp, kernel: _kernel, codeHash: _codeHash}));
+        latestUpdate = block.timestamp;
+        latestKernel = _kernel;
+        emit NewKernel(_kernel, _codeHash);
+    }
+}

contracts/deploy/Instance.sol

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+pragma solidity ^0.4.21;
+
+import "./InstanceStorage.sol";
+import "./DelegatedCall.sol";
+
+/**
+ * @title Instance
+ * @author Ricardo Guilherme Schmidt (Status Research & Development GmbH) 
+ * @dev Contract that forward everything through delegatecall to defined kernel
+ */
+contract Instance is InstanceStorage, DelegatedCall {
+
+    function Instance(address _kernel) public {
+        kernel = _kernel;
+    }
+
+    /**
+     * @dev delegatecall everything (but declared functions) to `_target()`
+     * @notice Verify `kernel()` code to predict behavior
+     */
+    function () external delegated {
+        //all goes to kernel
+    }
+
+    /**
+     * @dev returns kernel if kernel that is configured
+     * @return kernel address
+     */
+    function targetDelegatedCall()
+        internal
+        view
+        returns(address)
+    {
+        return kernel;
+    }
+
+
+}

contracts/deploy/InstanceStorage.sol

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+pragma solidity ^0.4.17;
+
+
+/**
+ * @title InstanceStorage
+ * @author Ricardo Guilherme Schmidt (Status Research & Development GmbH) 
+ * @dev Defines kernel vars that Kernel contract share with Instance.
+ *      Important to avoid overwriting wrong storage pointers is that 
+ *      InstanceStorage should be always the first contract at heritance.
+ */
+contract InstanceStorage {    
+    // protected zone start (InstanceStorage vars)
+    address public kernel;
+    // protected zone end
+}

contracts/deploy/UpdatableInstance.sol

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+pragma solidity ^0.4.17;
+
+import "./Instance.sol";
+
+
+/**
+ * @title UpdatableInstance
+ * @author Ricardo Guilherme Schmidt (Status Research & Development GmbH) 
+ * @dev Contract that can be updated by a call from itself.
+ */
+contract UpdatableInstance is Instance {
+
+    event InstanceUpdated(address oldKernel, address newKernel);
+
+    function UpdatableInstance(address _kernel) 
+        Instance(_kernel) 
+        public
+    {
+
+    }
+    
+    function updateUpdatableInstance(address _kernel) external {
+        require(msg.sender == address(this));
+        InstanceUpdated(kernel, _kernel);
+        kernel = _kernel;
+    }
+
+}