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Also defines storage requirements for Proxy.\n/// @author Alan Lu - \ncontract Proxied {\n address public masterCopy;\n}\n\n/// @title Proxy - Generic proxy contract allows to execute all transactions applying the code of a master contract.\n/// @author Stefan George - \ncontract Proxy is Proxied {\n /// @dev Constructor function sets address of master copy contract.\n /// @param _masterCopy Master copy address.\n constructor(address _masterCopy) {\n require(_masterCopy != address(0), \"The master copy is required\");\n masterCopy = _masterCopy;\n }\n\n /// @dev Fallback function forwards all transactions and returns all received return data.\n function _fallback() internal {\n address _masterCopy = masterCopy;\n assembly {\n calldatacopy(0, 0, calldatasize())\n let success := delegatecall(not(0), _masterCopy, 0, calldatasize(), 0, 0)\n returndatacopy(0, 0, returndatasize())\n switch success\n case 0 {\n revert(0, returndatasize())\n }\n default {\n return(0, returndatasize())\n }\n }\n }\n\n /**\n * @dev Fallback function that delegates calls to the masterCopy. \n * Runs when no other function in the contract matches the call data.\n */\n fallback () external payable {\n _fallback();\n }\n\n /**\n * @dev Fallback function that receives ether and delegates calls to masterCopy. \n * Runs when call data is empty.\n */\n receive () external payable {\n _fallback();\n }\n}\n", "sourcePath": "/Users/bensniff/Projects/gnosis/util-contracts/contracts/Proxy.sol", "ast": { "absolutePath": "/Users/bensniff/Projects/gnosis/util-contracts/contracts/Proxy.sol", "exportedSymbols": { "Proxied": [ 1616 ], "Proxy": [ 1667 ] }, "id": 1668, "license": "LGPL-3.0-only", "nodeType": "SourceUnit", "nodes": [ { "id": 1612, "literals": [ "solidity", "^", "0.7", ".0" ], "nodeType": "PragmaDirective", "src": "42:23:5" }, { "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "contract", "documentation": { "id": 1613, "nodeType": "StructuredDocumentation", "src": "67:148:5", "text": "@title Proxied - indicates that a contract will be proxied. Also defines storage requirements for Proxy.\n @author Alan Lu - " }, "fullyImplemented": true, "id": 1616, "linearizedBaseContracts": [ 1616 ], "name": "Proxied", "nodeType": "ContractDefinition", "nodes": [ { "constant": false, "functionSelector": "a619486e", "id": 1615, "mutability": "mutable", "name": "masterCopy", "nodeType": "VariableDeclaration", "scope": 1616, "src": "238:25:5", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 1614, "name": "address", "nodeType": "ElementaryTypeName", "src": "238:7:5", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "public" } ], "scope": 1668, "src": "215:51:5" }, { "abstract": false, "baseContracts": [ { "baseName": { "id": 1618, "name": "Proxied", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 1616, "src": "450:7:5", "typeDescriptions": { 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"t_stringliteral_2e9921edd8141a51172691d5d51dd1cbeb601d8d4953527c9d36e0bffd20fed9", "typeString": "literal_string \"The master copy is required\"" } ], "id": 1625, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ -18, -18 ], "referencedDeclaration": -18, "src": "627:7:5", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 1633, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "627:65:5", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 1634, "nodeType": "ExpressionStatement", "src": "627:65:5" }, { "expression": { "id": 1637, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "id": 1635, "name": "masterCopy", "nodeType": 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"number", "nodeType": "YulLiteral", "src": "1282:1:5", "type": "", "value": "0" }, { "arguments": [], "functionName": { "name": "returndatasize", "nodeType": "YulIdentifier", "src": "1285:14:5" }, "nodeType": "YulFunctionCall", "src": "1285:16:5" } ], "functionName": { "name": "return", "nodeType": "YulIdentifier", "src": "1275:6:5" }, "nodeType": "YulFunctionCall", "src": "1275:27:5" }, "nodeType": "YulExpressionStatement", "src": "1275:27:5" } ] }, "nodeType": "YulCase", "src": "1245:75:5", "value": "default" } ], "expression": { "name": "success", "nodeType": "YulIdentifier", "src": "1130:7:5" }, "nodeType": "YulSwitch", "src": "1123:197:5" } ] }, "evmVersion": "istanbul", "externalReferences": [ { "declaration": 1645, "isOffset": false, "isSlot": false, "src": "1022:11:5", "valueSize": 1 } ], "id": 1648, "nodeType": "InlineAssembly", "src": "916:414:5" } ] }, "documentation": { "id": 1641, "nodeType": "StructuredDocumentation", "src": "739:90:5", "text": "@dev Fallback function forwards all transactions and returns all received return data." }, "id": 1650, "implemented": true, "kind": "function", "modifiers": [], "name": "_fallback", "nodeType": "FunctionDefinition", "parameters": { "id": 1642, "nodeType": "ParameterList", "parameters": [], "src": "852:2:5" }, "returnParameters": { "id": 1643, "nodeType": "ParameterList", "parameters": [], "src": "864:0:5" }, "scope": 1667, "src": "834:502:5", "stateMutability": "nonpayable", "virtual": false, "visibility": "internal" }, { "body": { "id": 1657, "nodeType": "Block", "src": "1532:28:5", "statements": [ { "expression": { "arguments": [], "expression": { "argumentTypes": [], "id": 1654, "name": "_fallback", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 1650, "src": "1542:9:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$__$returns$__$", "typeString": "function ()" } }, "id": 1655, "isConstant": false, "isLValue": false, "isPure": false, "kind": 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"1733:28:5", "statements": [ { "expression": { "arguments": [], "expression": { "argumentTypes": [], "id": 1662, "name": "_fallback", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 1650, "src": "1743:9:5", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$__$returns$__$", "typeString": "function ()" } }, "id": 1663, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1743:11:5", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 1664, "nodeType": "ExpressionStatement", "src": "1743:11:5" } ] }, "documentation": { "id": 1659, "nodeType": "StructuredDocumentation", "src": "1566:134:5", "text": " @dev Fallback function that receives ether and delegates calls to masterCopy. \n Runs when call data is empty." }, "id": 1666, "implemented": true, "kind": "receive", "modifiers": 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}