{ "contractName": "DepositableDelegateProxy", "abi": [ { "constant": true, "inputs": [], "name": "proxyType", "outputs": [ { "name": "proxyTypeId", "type": "uint256" } ], "payable": false, "stateMutability": "pure", "type": "function" }, { "constant": true, "inputs": [], "name": "isDepositable", "outputs": [ { "name": "", "type": "bool" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "implementation", "outputs": [ { "name": "codeAddr", "type": "address" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "payable": true, "stateMutability": "payable", "type": "fallback" }, { "anonymous": false, "inputs": [ { "indexed": false, "name": "sender", "type": "address" }, { "indexed": false, "name": "value", "type": "uint256" } ], "name": "ProxyDeposit", "type": "event" } ], "metadata": "", "bytecode": "0x", "deployedBytecode": "0x", "sourceMap": "", "deployedSourceMap": "", "source": "pragma solidity 0.4.24;\n\nimport \"./DelegateProxy.sol\";\nimport \"./DepositableStorage.sol\";\n\n\ncontract DepositableDelegateProxy is DepositableStorage, DelegateProxy {\n event ProxyDeposit(address sender, uint256 value);\n\n function () external payable {\n uint256 forwardGasThreshold = FWD_GAS_LIMIT;\n bytes32 isDepositablePosition = DEPOSITABLE_POSITION;\n\n // Optimized assembly implementation to prevent EIP-1884 from breaking deposits, reference code in Solidity:\n // https://github.com/aragon/aragonOS/blob/v4.2.1/contracts/common/DepositableDelegateProxy.sol#L10-L20\n assembly {\n // Continue only if the gas left is lower than the threshold for forwarding to the implementation code,\n // otherwise continue outside of the assembly block.\n if lt(gas, forwardGasThreshold) {\n // Only accept the deposit and emit an event if all of the following are true:\n // the proxy accepts deposits (isDepositable), msg.data.length == 0, and msg.value > 0\n if and(and(sload(isDepositablePosition), iszero(calldatasize)), gt(callvalue, 0)) {\n // Equivalent Solidity code for emitting the event:\n // emit ProxyDeposit(msg.sender, msg.value);\n\n let logData := mload(0x40) // free memory pointer\n mstore(logData, caller) // add 'msg.sender' to the log data (first event param)\n mstore(add(logData, 0x20), callvalue) // add 'msg.value' to the log data (second event param)\n\n // Emit an event with one topic to identify the event: keccak256('ProxyDeposit(address,uint256)') = 0x15ee...dee1\n log1(logData, 0x40, 0x15eeaa57c7bd188c1388020bcadc2c436ec60d647d36ef5b9eb3c742217ddee1)\n\n stop() // Stop. 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