{
    "Function": "withdraw",
    "File": "contracts/legacy/MetaVault.sol",
    "Parent Contracts": [
        "contracts/legacy/IMetaVault.sol",
        "node_modules/@openzeppelin/contracts/token/ERC20/ERC20.sol",
        "node_modules/@openzeppelin/contracts/token/ERC20/IERC20.sol",
        "node_modules/@openzeppelin/contracts/GSN/Context.sol"
    ],
    "High-Level Calls": [
        "SafeMath",
        "IVaultManager",
        "SafeMath",
        "IERC20",
        "IERC20",
        "SafeERC20",
        "IConverter",
        "SafeMath",
        "SafeERC20",
        "IController",
        "SafeMath",
        "SafeMath",
        "SafeMath",
        "SafeMath",
        "SafeMath",
        "SafeMath",
        "IConverter",
        "SafeERC20"
    ],
    "Internal Calls": [
        "require(bool,string)",
        "balanceOf",
        "_burn",
        "totalSupply",
        "unstake",
        "require(bool,string)",
        "balance"
    ],
    "Library Calls": [
        "div",
        "div",
        "safeTransfer",
        "safeTransfer",
        "sub",
        "sub",
        "add",
        "safeTransfer",
        "mul",
        "mul",
        "sub",
        "sub"
    ],
    "Low-Level Calls": [],
    "Code": "function withdraw(uint _shares, address _output) public override {\n        uint _userBal = balanceOf(msg.sender);\n        if (_shares > _userBal) {\n            uint _need = _shares.sub(_userBal);\n            require(_need <= userInfo[msg.sender].amount, \"_userBal+staked < _shares\");\n            unstake(_need);\n        }\n        uint r = (balance().mul(_shares)).div(totalSupply());\n        _burn(msg.sender, _shares);\n\n        if (address(vaultManager) != address(0)) {\n            // expected 0.1% of withdrawal go back to vault (for auto-compounding) to protect withdrawals\n            // it is updated by governance (community vote)\n            uint _withdrawalProtectionFee = vaultManager.withdrawalProtectionFee();\n            if (_withdrawalProtectionFee > 0) {\n                uint _withdrawalProtection = r.mul(_withdrawalProtectionFee).div(10000);\n                r = r.sub(_withdrawalProtection);\n            }\n        }\n\n        // Check balance\n        uint b = token3CRV.balanceOf(address(this));\n        if (b < r) {\n            uint _toWithdraw = r.sub(b);\n            if (controller != address(0)) {\n                IController(controller).withdraw(address(token3CRV), _toWithdraw);\n            }\n            uint _after = token3CRV.balanceOf(address(this));\n            uint _diff = _after.sub(b);\n            if (_diff < _toWithdraw) {\n                r = b.add(_diff);\n            }\n        }\n\n        if (_output == address(token3CRV)) {\n            token3CRV.safeTransfer(msg.sender, r);\n        } else {\n            require(converter.convert_rate(address(token3CRV), _output, r) > 0, \"rate=0\");\n            token3CRV.safeTransfer(address(converter), r);\n            uint _outputAmount = converter.convert(address(token3CRV), _output, r);\n            IERC20(_output).safeTransfer(msg.sender, _outputAmount);\n        }\n    }"
}