MyContract.sol

ABI

[
	{
		"constant": false,
		"inputs": [
			{
				"internalType": "string",
				"name": "name",
				"type": "string"
			}
		],
		"name": "registerUser",
		"outputs": [],
		"payable": false,
		"stateMutability": "nonpayable",
		"type": "function"
	}
]

Bytecode

{
	"linkReferences": {},
	"object": "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",
	"opcodes": "PUSH1 0x80 PUSH1 0x40 MSTORE PUSH1 0x0 DUP1 SSTORE CALLVALUE DUP1 ISZERO PUSH2 0x14 JUMPI PUSH1 0x0 DUP1 REVERT JUMPDEST POP PUSH2 0x453 DUP1 PUSH2 0x24 PUSH1 0x0 CODECOPY PUSH1 0x0 RETURN INVALID PUSH1 0x80 PUSH1 0x40 MSTORE CALLVALUE DUP1 ISZERO PUSH2 0x10 JUMPI PUSH1 0x0 DUP1 REVERT JUMPDEST POP PUSH1 0x4 CALLDATASIZE LT PUSH2 0x2B JUMPI PUSH1 0x0 CALLDATALOAD PUSH1 0xE0 SHR DUP1 PUSH4 0x704F1B94 EQ PUSH2 0x30 JUMPI JUMPDEST PUSH1 0x0 DUP1 REVERT JUMPDEST PUSH2 0xE9 PUSH1 0x4 DUP1 CALLDATASIZE SUB PUSH1 0x20 DUP2 LT ISZERO PUSH2 0x46 JUMPI PUSH1 0x0 DUP1 REVERT JUMPDEST DUP2 ADD SWAP1 DUP1 DUP1 CALLDATALOAD SWAP1 PUSH1 0x20 ADD SWAP1 PUSH5 0x100000000 DUP2 GT ISZERO PUSH2 0x63 JUMPI PUSH1 0x0 DUP1 REVERT JUMPDEST DUP3 ADD DUP4 PUSH1 0x20 DUP3 ADD GT ISZERO PUSH2 0x75 JUMPI PUSH1 0x0 DUP1 REVERT JUMPDEST DUP1 CALLDATALOAD SWAP1 PUSH1 0x20 ADD SWAP2 DUP5 PUSH1 0x1 DUP4 MUL DUP5 ADD GT PUSH5 0x100000000 DUP4 GT OR ISZERO PUSH2 0x97 JUMPI PUSH1 0x0 DUP1 REVERT JUMPDEST SWAP2 SWAP1 DUP1 DUP1 PUSH1 0x1F ADD PUSH1 0x20 DUP1 SWAP2 DIV MUL PUSH1 0x20 ADD PUSH1 0x40 MLOAD SWAP1 DUP2 ADD PUSH1 0x40 MSTORE DUP1 SWAP4 SWAP3 SWAP2 SWAP1 DUP2 DUP2 MSTORE PUSH1 0x20 ADD DUP4 DUP4 DUP1 DUP3 DUP5 CALLDATACOPY PUSH1 0x0 DUP2 DUP5 ADD MSTORE PUSH1 0x1F NOT PUSH1 0x1F DUP3 ADD AND SWAP1 POP DUP1 DUP4 ADD SWAP3 POP POP POP POP POP POP POP SWAP2 SWAP3 SWAP2 SWAP3 SWAP1 POP POP POP PUSH2 0xEB JUMP JUMPDEST STOP JUMPDEST PUSH1 0x0 PUSH1 0x1 PUSH1 0x0 CALLER PUSH20 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF AND PUSH20 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF AND DUP2 MSTORE PUSH1 0x20 ADD SWAP1 DUP2 MSTORE PUSH1 0x20 ADD PUSH1 0x0 KECCAK256 SWAP1 POP PUSH1 0x40 MLOAD PUSH1 0x20 ADD DUP1 PUSH1 0x0 ADD SWAP1 POP PUSH1 0x40 MLOAD PUSH1 0x20 DUP2 DUP4 SUB SUB DUP2 MSTORE SWAP1 PUSH1 0x40 MSTORE DUP1 MLOAD SWAP1 PUSH1 0x20 ADD KECCAK256 DUP3 PUSH1 0x40 MLOAD PUSH1 0x20 ADD DUP1 DUP3 DUP1 MLOAD SWAP1 PUSH1 0x20 ADD SWAP1 DUP1 DUP4 DUP4 JUMPDEST PUSH1 0x20 DUP4 LT PUSH2 0x187 JUMPI DUP1 MLOAD DUP3 MSTORE PUSH1 0x20 DUP3 ADD SWAP2 POP PUSH1 0x20 DUP2 ADD SWAP1 POP PUSH1 0x20 DUP4 SUB SWAP3 POP PUSH2 0x164 JUMP JUMPDEST PUSH1 0x1 DUP4 PUSH1 0x20 SUB PUSH2 0x100 EXP SUB DUP1 NOT DUP3 MLOAD AND DUP2 DUP5 MLOAD AND DUP1 DUP3 OR DUP6 MSTORE POP POP POP POP POP POP SWAP1 POP ADD SWAP2 POP POP PUSH1 0x40 MLOAD PUSH1 0x20 DUP2 DUP4 SUB SUB DUP2 MSTORE SWAP1 PUSH1 0x40 MSTORE DUP1 MLOAD SWAP1 PUSH1 0x20 ADD KECCAK256 EQ ISZERO PUSH2 0x1CD JUMPI PUSH1 0x0 DUP1 REVERT JUMPDEST DUP1 PUSH1 0x0 ADD PUSH1 0x0 SWAP1 SLOAD SWAP1 PUSH2 0x100 EXP SWAP1 DIV PUSH20 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF AND PUSH20 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF AND CALLER PUSH20 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF AND EQ ISZERO PUSH2 0x293 JUMPI PUSH1 0x40 MLOAD PUSH32 0x8C379A000000000000000000000000000000000000000000000000000000000 DUP2 MSTORE PUSH1 0x4 ADD DUP1 DUP1 PUSH1 0x20 ADD DUP3 DUP2 SUB DUP3 MSTORE PUSH1 0x12 DUP2 MSTORE PUSH1 0x20 ADD DUP1 PUSH32 0x616C726561647920726567697374657265640000000000000000000000000000 DUP2 MSTORE POP PUSH1 0x20 ADD SWAP2 POP POP PUSH1 0x40 MLOAD DUP1 SWAP2 SUB SWAP1 REVERT JUMPDEST PUSH1 0x40 MLOAD DUP1 PUSH1 0x40 ADD PUSH1 0x40 MSTORE DUP1 CALLER PUSH20 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF AND DUP2 MSTORE PUSH1 0x20 ADD DUP4 DUP2 MSTORE POP PUSH1 0x1 PUSH1 0x0 CALLER PUSH20 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF AND PUSH20 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF AND DUP2 MSTORE PUSH1 0x20 ADD SWAP1 DUP2 MSTORE PUSH1 0x20 ADD PUSH1 0x0 KECCAK256 PUSH1 0x0 DUP3 ADD MLOAD DUP2 PUSH1 0x0 ADD PUSH1 0x0 PUSH2 0x100 EXP DUP2 SLOAD DUP2 PUSH20 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF MUL NOT AND SWAP1 DUP4 PUSH20 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF AND MUL OR SWAP1 SSTORE POP PUSH1 0x20 DUP3 ADD MLOAD DUP2 PUSH1 0x1 ADD SWAP1 DUP1 MLOAD SWAP1 PUSH1 0x20 ADD SWAP1 PUSH2 0x360 SWAP3 SWAP2 SWAP1 PUSH2 0x379 JUMP JUMPDEST POP SWAP1 POP POP PUSH1 0x0 DUP1 DUP2 SLOAD DUP1 SWAP3 SWAP2 SWAP1 PUSH1 0x1 ADD SWAP2 SWAP1 POP SSTORE POP POP POP JUMP JUMPDEST DUP3 DUP1 SLOAD PUSH1 0x1 DUP2 PUSH1 0x1 AND ISZERO PUSH2 0x100 MUL SUB AND PUSH1 0x2 SWAP1 DIV SWAP1 PUSH1 0x0 MSTORE PUSH1 0x20 PUSH1 0x0 KECCAK256 SWAP1 PUSH1 0x1F ADD PUSH1 0x20 SWAP1 DIV DUP2 ADD SWAP3 DUP3 PUSH1 0x1F LT PUSH2 0x3BA JUMPI DUP1 MLOAD PUSH1 0xFF NOT AND DUP4 DUP1 ADD OR DUP6 SSTORE PUSH2 0x3E8 JUMP JUMPDEST DUP3 DUP1 ADD PUSH1 0x1 ADD DUP6 SSTORE DUP3 ISZERO PUSH2 0x3E8 JUMPI SWAP2 DUP3 ADD JUMPDEST DUP3 DUP2 GT ISZERO PUSH2 0x3E7 JUMPI DUP3 MLOAD DUP3 SSTORE SWAP2 PUSH1 0x20 ADD SWAP2 SWAP1 PUSH1 0x1 ADD SWAP1 PUSH2 0x3CC JUMP JUMPDEST JUMPDEST POP SWAP1 POP PUSH2 0x3F5 SWAP2 SWAP1 PUSH2 0x3F9 JUMP JUMPDEST POP SWAP1 JUMP JUMPDEST PUSH2 0x41B SWAP2 SWAP1 JUMPDEST DUP1 DUP3 GT ISZERO PUSH2 0x417 JUMPI PUSH1 0x0 DUP2 PUSH1 0x0 SWAP1 SSTORE POP PUSH1 0x1 ADD PUSH2 0x3FF JUMP JUMPDEST POP SWAP1 JUMP JUMPDEST SWAP1 JUMP INVALID LOG2 PUSH6 0x627A7A723158 KECCAK256 PUSH6 0x3B3AF357DF03 SGT MSTORE8 0xB4 TIMESTAMP 0xCF LOG3 0x49 CHAINID 0xBC 0xCD 0xB2 EXP 0x24 0xD SDIV PUSH29 0x98D1838A0971DCA35464736F6C63430005100032000000000000000000 ",
	"sourceMap": "27:582:0:-;;;162:1;135:28;;27:582;8:9:-1;5:2;;;30:1;27;20:12;5:2;27:582:0;;;;;;;"
}

MyContract.sol

pragma solidity ^0.5.0;

contract MyContract {
    
    struct user {
        address id;
        string name;
    }
    
    uint internal totalUsers = 0;
    mapping(address => user) internal users;
    
    function registerUser(string memory name) public {
        user storage u = users[msg.sender];
        require(keccak256(abi.encodePacked((name))) != keccak256(abi.encodePacked((""))));
        if(msg.sender == u.id) {
            revert("already registered");
        } else {
            users[msg.sender] = user(msg.sender, name);
            totalUsers++;
        }
    }
}