uniswap v4 合约解析1 pool初始化

当我们创建一个pool时，其入口函数位PoolManager合约的initialize方法:

 代码如下：

    /// @inheritdoc IPoolManager
    function initialize(PoolKey memory key, uint160 sqrtPriceX96) external noDelegateCall returns (int24 tick) {
        // see TickBitmap.sol for overflow conditions that can arise from tick spacing being too large
        if (key.tickSpacing > MAX_TICK_SPACING) TickSpacingTooLarge.selector.revertWith(key.tickSpacing);
        if (key.tickSpacing < MIN_TICK_SPACING) TickSpacingTooSmall.selector.revertWith(key.tickSpacing);
        if (key.currency0 >= key.currency1) {
            CurrenciesOutOfOrderOrEqual.selector.revertWith(
                Currency.unwrap(key.currency0), Currency.unwrap(key.currency1)
            );
        }
        if (!key.hooks.isValidHookAddress(key.fee)) Hooks.HookAddressNotValid.selector.revertWith(address(key.hooks));

        uint24 lpFee = key.fee.getInitialLPFee();

        key.hooks.beforeInitialize(key, sqrtPriceX96);

        PoolId id = key.toId();

        tick = _pools[id].initialize(sqrtPriceX96, lpFee);

        // event is emitted before the afterInitialize call to ensure events are always emitted in order
        // emit all details of a pool key. poolkeys are not saved in storage and must always be provided by the caller
        // the key's fee may be a static fee or a sentinel to denote a dynamic fee.
        emit Initialize(id, key.currency0, key.currency1, key.fee, key.tickSpacing, key.hooks, sqrtPriceX96, tick);

        key.hooks.afterInitialize(key, sqrtPriceX96, tick);
    }

校验

第一步是校验

if (key.tickSpacing > MAX_TICK_SPACING) TickSpacingTooLarge.selector.revertWith(key.tickSpacing);
if (key.tickSpacing < MIN_TICK_SPACING) TickSpacingTooSmall.selector.revertWith(key.tickSpacing);

根据MAX_TICK_SPACING和MIN_TICK_SPACING的定义，tickSpa