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"source": "pragma solidity 0.4.18;\n\nimport \"./DelegateScript.sol\";\n\n// Inspired by: https://github.com/dapphub/ds-proxy/blob/master/src/proxy.sol\n\n\ncontract DeployDelegateScript is DelegateScript {\n uint256 constant internal SCRIPT_START_LOCATION = 4;\n\n mapping (bytes32 => address) cache;\n\n /**\n * @notice Executes script by delegatecall into a deployed contract (exec() function)\n * @param _script [ specId (uint32) ][ contractInitcode (bytecode) ]\n * @param _input ABI encoded call to be made to contract (if empty executes default exec() function)\n * @param _blacklist If any address is passed, will revert.\n * @return Call return data\n */\n function execScript(bytes _script, bytes _input, address[] _blacklist) external returns (bytes) {\n require(_blacklist.length == 0); // dont have ability to control bans, so fail.\n\n bytes32 id = keccak256(_script);\n address deployed = cache[id];\n if (deployed == address(0)) {\n deployed = deploy(_script);\n cache[id] = deployed;\n }\n\n return DelegateScript.delegate(deployed, _input);\n }\n\n /**\n * @dev Deploys contract byte code to network\n */\n function deploy(bytes _script) internal returns (address addr) {\n assembly {\n // 0x24 = 0x20 (length) + 0x04 (spec id uint32)\n // Length of code is 4 bytes less than total script size\n addr := create(0, add(_script, 0x24), sub(mload(_script), 0x04))\n switch iszero(extcodesize(addr))\n case 1 { revert(0, 0) } // throw if contract failed to deploy\n }\n }\n}", "sourcePath": "@aragon/os/contracts/evmscript/executors/DeployDelegateScript.sol", "ast": { "attributes": { "absolutePath": "@aragon/os/contracts/evmscript/executors/DeployDelegateScript.sol", "exportedSymbols": { "DeployDelegateScript": [ 8585 ] } }, "children": [ { "attributes": { "literals": [ "solidity", "0.4", ".18" ] }, "id": 8508, "name": "PragmaDirective", "src": "0:23:35" }, { "attributes": { "SourceUnit": 8507, "absolutePath": "@aragon/os/contracts/evmscript/executors/DelegateScript.sol", "file": "./DelegateScript.sol", "scope": 8586, "symbolAliases": [ null ], "unitAlias": "" }, "id": 8509, "name": "ImportDirective", "src": "25:30:35" }, { "attributes": { "contractDependencies": [ 7861, 8506 ], "contractKind": "contract", "documentation": null, "fullyImplemented": true, "linearizedBaseContracts": [ 8585, 8506, 7861 ], "name": "DeployDelegateScript", "scope": 8586 }, "children": [ { "attributes": { "arguments": [ null ] }, "children": [ { "attributes": { "contractScope": null, "name": "DelegateScript", "referencedDeclaration": 8506, "type": "contract DelegateScript" }, "id": 8510, "name": "UserDefinedTypeName", "src": "170:14:35" } ], "id": 8511, "name": "InheritanceSpecifier", "src": "170:14:35" }, { "attributes": { "constant": true, "name": "SCRIPT_START_LOCATION", "scope": 8585, "stateVariable": true, "storageLocation": "default", "type": "uint256", "visibility": "internal" }, "children": [ { "attributes": { "name": "uint256", "type": "uint256" }, "id": 8512, "name": "ElementaryTypeName", "src": "191:7:35" }, { "attributes": { "argumentTypes": null, "hexvalue": "34", "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "subdenomination": null, "token": "number", "type": "int_const 4", "value": "4" }, "id": 8513, "name": "Literal", "src": "241:1:35" } ], "id": 8514, "name": "VariableDeclaration", "src": "191:51:35" }, { "attributes": { "constant": false, "name": "cache", "scope": 8585, "stateVariable": true, "storageLocation": "default", "type": "mapping(bytes32 => address)", "value": null, "visibility": "internal" }, "children": [ { "attributes": { "type": "mapping(bytes32 => address)" }, "children": [ { "attributes": { "name": "bytes32", "type": "bytes32" }, "id": 8515, "name": "ElementaryTypeName", "src": "258:7:35" }, { "attributes": { "name": "address", "type": "address" }, "id": 8516, "name": "ElementaryTypeName", "src": "269:7:35" } ], "id": 8517, "name": "Mapping", "src": "249:28:35" } ], "id": 8518, "name": "VariableDeclaration", "src": "249:34:35" }, { "attributes": { "constant": false, "implemented": true, "isConstructor": false, "modifiers": [ null ], "name": "execScript", "payable": false, "scope": 8585, "stateMutability": "nonpayable", "superFunction": 8433, "visibility": "external" }, "children": [ { "children": [ { "attributes": { "constant": false, "name": "_script", "scope": 8575, "stateVariable": false, "storageLocation": "default", "type": "bytes calldata", "value": null, "visibility": "internal" }, "children": [ { "attributes": { "name": "bytes", "type": "bytes storage pointer" }, "id": 8519, "name": "ElementaryTypeName", "src": "684:5:35" } ], "id": 8520, "name": "VariableDeclaration", "src": "684:13:35" }, { "attributes": { "constant": false, "name": "_input", "scope": 8575, "stateVariable": false, "storageLocation": "default", "type": "bytes calldata", "value": null, "visibility": "internal" }, "children": [ { "attributes": { "name": "bytes", "type": "bytes storage pointer" }, "id": 8521, "name": "ElementaryTypeName", "src": "699:5:35" } ], "id": 8522, "name": "VariableDeclaration", "src": "699:12:35" }, { "attributes": { "constant": false, "name": "_blacklist", "scope": 8575, "stateVariable": false, "storageLocation": "default", "type": "address[] calldata", "value": null, "visibility": "internal" }, "children": [ { "attributes": { "length": null, "type": "address[] storage pointer" }, "children": [ { "attributes": { "name": "address", "type": "address" }, "id": 8523, "name": "ElementaryTypeName", "src": "713:7:35" } ], "id": 8524, "name": "ArrayTypeName", "src": "713:9:35" } ], "id": 8525, "name": "VariableDeclaration", "src": "713:20:35" } ], "id": 8526, "name": "ParameterList", "src": "683:51:35" }, { "children": [ { "attributes": { "constant": false, "name": "", "scope": 8575, "stateVariable": false, "storageLocation": "default", "type": "bytes memory", "value": null, 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