GNSDiamondCut

Based on EIP-2535: Diamonds (https://eips.ethereum.org/EIPS/eip-2535) Follows diamond-3 implementation (https://github.com/mudgen/diamond-3-hardhat/) Manages all actions (calls, updates and initializations) related to the diamond and its facets.

fallback

fallback() external payable

Forwards call to the right facet using msg.sig using delegatecall. Reverts if signature is not known.

receive

receive() external payable

Allows the contract to receive ether

diamondCut

function diamondCut(struct IDiamondStorage.FacetCut[] _faceCut, address _init, bytes _calldata) external

Add/replace/remove any number of functions and optionally execute a function with delegatecall

Parameters

Name	Type	Description
_faceCut	IDiamondStorage.FacetCut[]
_init	address	The address of the contract or facet to execute _calldata
_calldata	bytes	A function call, including function selector and arguments _calldata is executed with delegatecall on _init

_diamondCut

function _diamondCut(struct IDiamondStorage.FacetCut[] _facetCut, address _init, bytes _calldata) internal

Internal function for diamondCut()

_addFunctions

function _addFunctions(address _facetAddress, bytes4[] _functionSelectors) internal

Adds the facet if it wasn't added yet, and adds its functions to the diamond

Parameters

Name	Type	Description
_facetAddress	address	address of the facet contract
_functionSelectors	bytes4[]	array of function selectors

_replaceFunctions

function _replaceFunctions(address _facetAddress, bytes4[] _functionSelectors) internal

Updates facet contract address for given function selectors

Parameters

Name	Type	Description
_facetAddress	address	address of the facet contract
_functionSelectors	bytes4[]	array of function selectors

_removeFunctions

function _removeFunctions(address _facetAddress, bytes4[] _functionSelectors) internal

Removes some function selectors of a facet from diamond

Parameters

Name	Type	Description
_facetAddress	address	address of the facet contract
_functionSelectors	bytes4[]	array of function selectors

_addFacet

function _addFacet(struct IDiamondStorage.DiamondStorage s, address _facetAddress) internal

Adds a new facet contract address to the diamond

Parameters

Name	Type	Description
s	IDiamondStorage.DiamondStorage	diamond storage pointer
_facetAddress	address	address of the new facet contract

_addFunction

function _addFunction(struct IDiamondStorage.DiamondStorage s, bytes4 _selector, uint96 _selectorPosition, address _facetAddress) internal

Adds a new function to the diamond for a given facet contract

Parameters

Name	Type	Description
s	IDiamondStorage.DiamondStorage	diamond storage pointer
_selector	bytes4	function selector
_selectorPosition	uint96	position of the function selector in the facet selectors array
_facetAddress	address	address of the facet contract

_removeFunction

function _removeFunction(struct IDiamondStorage.DiamondStorage s, address _facetAddress, bytes4 _selector) internal

Removes a function from a facet of the diamond

Parameters

Name	Type	Description
s	IDiamondStorage.DiamondStorage	diamond storage pointer
_facetAddress	address	address of the facet contract
_selector	bytes4	function selector

_initializeDiamondCut

function _initializeDiamondCut(address _init, bytes _calldata) internal

Initializes a facet after updating the diamond using delegatecall

Parameters

Name	Type	Description
_init	address	address of the contract to execute _calldata
_calldata	bytes	function call (selector and arguments)

_enforceHasContractCode

function _enforceHasContractCode(address _contract) internal view

Reverts if the given address is not a contract

Parameters

Name	Type	Description
_contract	address	address to check