Solidity - Receive and Fallback functions

Which function is called, fallback() or receive()?

       send Ether
           |
     msg.data is empty?
          / \
        yes  no
        /     \
receive() exists?  fallback()
     /   \
    yes   no
    /      \
receive()   fallback()

---

• The recieve function is executed when no calldata is provided.
• This function cannot have arguments, cannot return anything and must have external visibility and payable state mutability. It can be virtual, can override and can have modifiers

receive() external payable {
      console.log("Me executed when no calldata is provided");
}

• Fallback function is executed when none of the other functions match the give function signature.
• In order to receive ether it should be marked as payable.

fallback() external payable { 
        console.logBytes(msg.data);
}

When the calldata is passed. Through low level interactions like call or through remix ide low level calldata.

function callTota(Contract toCallContract) public returns (bool) {
        (bool success,) = address(toCallContract).call(abi.encodeWithSignature("nthada()"));
        return success;
}

This nthada() function does not exists so ‘console.logBytes(msg.data);’ will be executed.

• If neither a receive Ether nor a payable fallback function is present, the contract cannot receive Ether through a transaction that does not represent a payable function call and throws an exception.