{
    "Function": "permit",
    "File": "contracts/l2/token/GraphTokenUpgradeable.sol",
    "Parent Contracts": [
        "node_modules/@openzeppelin/contracts-upgradeable/token/ERC20/ERC20BurnableUpgradeable.sol",
        "node_modules/@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol",
        "node_modules/@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol",
        "node_modules/@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol",
        "node_modules/@openzeppelin/contracts-upgradeable/proxy/Initializable.sol",
        "contracts/governance/Governed.sol",
        "contracts/upgrades/GraphUpgradeable.sol"
    ],
    "High-Level Calls": [
        "SafeMathUpgradeable",
        "ECDSA"
    ],
    "Internal Calls": [
        "require(bool,string)",
        "keccak256(bytes)",
        "abi.encode()",
        "require(bool,string)",
        "_approve",
        "abi.encodePacked()",
        "keccak256(bytes)"
    ],
    "Library Calls": [
        "add",
        "recover"
    ],
    "Low-Level Calls": [],
    "Code": "function permit(\n        address _owner,\n        address _spender,\n        uint256 _value,\n        uint256 _deadline,\n        uint8 _v,\n        bytes32 _r,\n        bytes32 _s\n    ) external {\n        bytes32 digest = keccak256(\n            abi.encodePacked(\n                \"\\x19\\x01\",\n                DOMAIN_SEPARATOR,\n                keccak256(\n                    abi.encode(PERMIT_TYPEHASH, _owner, _spender, _value, nonces[_owner], _deadline)\n                )\n            )\n        );\n\n        address recoveredAddress = ECDSA.recover(digest, _v, _r, _s);\n        require(_owner == recoveredAddress, \"GRT: invalid permit\");\n        require(_deadline == 0 || block.timestamp <= _deadline, \"GRT: expired permit\");\n\n        nonces[_owner] = nonces[_owner].add(1);\n        _approve(_owner, _spender, _value);\n    }"
}