Huff

/* Simple Counter Contract in Huff */

/* Interface */
#define function getValue() view returns (uint256)
#define function setValue(uint256) nonpayable returns ()

/* Storage Slots */
#define constant VALUE_LOCATION = FREE_STORAGE_POINTER()

/* Getter Macro */
#define macro GET_VALUE() = takes (0) returns (0) {
    [VALUE_LOCATION]   // [value_location]
    sload              // [value]
    0x00 mstore        // []
    0x20 0x00 return   // []
}

/* Setter Macro */
#define macro SET_VALUE() = takes (0) returns (0) {
    0x04 calldataload  // [value]
    [VALUE_LOCATION]   // [value, value_location]
    sstore             // []
    stop               // []
}

/* Main Entry Point */
#define macro MAIN() = takes (0) returns (0) {
    // Get the function selector
    0x00 calldataload 0xE0 shr

    // Jump to the implementation of the function
    dup1 __FUNC_SIG(getValue) eq getvalue jumpi
    dup1 __FUNC_SIG(setValue) eq setvalue jumpi

    // Revert if no match
    0x00 0x00 revert

    getvalue:
        GET_VALUE()
    setvalue:
        SET_VALUE()
}