uniswap v3/v4 中pool的状态管理

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已于 2025-06-08 19:15:44 修改 · 1.7k 阅读

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于 2023-02-17 20:12:58 首次发布

文章详细介绍了UniswapV3中tick的存储结构和价格计算方法，包括tick的流动性管理，Q64.94精度的定点数表示，以及如何通过位图高效管理大量ticks。在价格变动时，根据tick的liquidityNet和liquidityGross更新流动性，并展示了计算sqrtPriceX96的复杂但优化过的算法过程。

首先看一下v4版本pool的state结构

 /// @notice The state of a pool
    /// @dev Note that feeGrowthGlobal can be artificially inflated
    /// For pools with a single liquidity position, actors can donate to themselves to freely inflate feeGrowthGlobal
    /// atomically donating and collecting fees in the same unlockCallback may make the inflated value more extreme
    struct State {
        Slot0 slot0;
        uint256 feeGrowthGlobal0X128;
        uint256 feeGrowthGlobal1X128;
        uint128 liquidity;
        mapping(int24 tick => TickInfo) ticks;
        mapping(int16 wordPos => uint256) tickBitmap;
        mapping(bytes32 positionKey => Position.State) positions;
    }

slot0

Slot0 是一个紧凑的结构体，使用 bytes32 类型来存储多个字段的数据。通过这种方式，可以在以太坊智能合约中节省存储成本，因为存储多个字段在一个存储槽中比单独存储每个字段更节省 gas。

type Slot0 is bytes32;

using Slot0Library for Slot0 global;

/// @notice Library for getting and setting values in the Slot0 type
library Slot0Library {
    uint160 internal constant MASK_160_BITS = 0x00FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF;
    uint24 internal constant MASK_24_BITS = 0xFFFFFF;

    uint8 internal constant TICK_OFFSET = 160;
    uint8 internal constant PROTOCOL_FEE_OFFSET = 184;
    uint8 internal constant LP_FEE_OFFSET = 208;

    // #### GETTERS ####
    function sqrtPriceX96(Slot0 _packed) internal pure returns (uint160 _sqrtPriceX96) {
        assembly ("memory-safe") {
            _sqrtPriceX96 := and(MASK_160_BITS, _packed)
        }
    }

    function tick(Slot0 _packed) internal pure returns (int24 _tick) {
        assembly ("memory-safe") {
            _tick := signextend(2, shr(TICK_OFFSET, _packed))
        }
    }

    function protocolFee(Slot0 _packed) internal pure returns (uint24 _protocolFee) {
        assembly ("memory-safe") {
            _protocolFee := and(MASK_24_BITS, shr(PROTOCOL_FEE_OFFSET, _packed))
        }
    }

    function lpFee(Slot0 _packed) internal pure returns (uint24 _lpFee) {
        assembly ("memory-safe") {
            _lpFee := and(MASK_24_BITS, shr(LP_FEE_OFFSET, _packed))
        }
    }

    // #### SETTERS ####
    function setSqrtPriceX96(Slot0 _packed, uint160 _sqrtPriceX96) internal pure returns (Slot0 _result) {
        assembly ("memory-safe") {
            _result := or(and(not(MASK_160_BITS), _packed), and(MASK_160_BITS, _sqrtPriceX96))
        }
    }

    function setTick(Slot0 _packed, int24 _tick) internal pure returns (Slot0 _result) {
        assembly ("memory-safe") {
            _result := or(and(not(shl(TICK_OFFSET, MASK_24_BITS)), _packed), shl(TICK_OFFSET, and(MASK_24_BITS, _tick)))
        }
    }

    function setProtocolFee(Slot0 _packed, uint24 _protocolFee) internal pure returns (Slot0 _result) {
        assembly ("memory-safe") {
            _result :=
                or(
                    and(not(shl(PROTOCOL_FEE_OFFSET, MASK_24_BITS)), _packed),
                    shl(PROTOCOL_FEE_OFFSET, and(MASK_24_BITS, _protocolFee))
                )
        }
    }

    function setLpFee(Slot0 _packed, uint24 _lpFee) internal pure returns (Slot0 _result) {
        assembly ("memory-safe") {
            _result :=
                or(and(not(shl(LP_FEE_OFFSET, MASK_24_BITS)), _packed), shl(LP_FEE_OFFSET, and(MASK_24_BITS, _lpFee)))
        }
    }
}

type Slot0 is bytes32; 其中byte32代表32个字节，每个字节8位，总共256位,其数据的布局如下

（从最低有效位到最高有效位）：