Contract

UniswapV3Pool0x458139d6f0c6164e5ade536000be80d06d5bb015

Overview

ETH Balance

0 ETH

ETH Value

$0.00 (@ $1,867/ETH)

Token Holdings

More Info

Private Name Tags

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Contract Creator

0x1f7d…2efa at txn 0x7ac7d3…dc95d6

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Transactions Internal Transactions Token Transfers (ERC-20)NFT Transfers Other Transactions Contract✓Events Analytics Assets Cards Info

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Contract Name

UniswapV3Pool

Compiler

solidity · v0.7.6+commit.7338295f

Optimization

Yes · 800 runs

EVM Version

istanbul

Source

Mirrored from Robinhood Chain explorer

Contract Source Code

Outline

C UniswapV3Pool

ƒ checkTicks

ƒ _blockTimestamp

ƒ balance0

ƒ balance1

ƒ snapshotCumulativesInside

ƒ observe

ƒ increaseObservationCardinalityNext

ƒ initialize

ƒ _modifyPosition

ƒ _updatePosition

ƒ mint

ƒ collect

ƒ burn

ƒ swap

ƒ flash

ƒ setFeeProtocol

ƒ collectProtocol

UniswapV3Pool.sol

// SPDX-License-Identifier: BUSL-1.1
pragma solidity =0.7.6;

import './interfaces/IUniswapV3Pool.sol';

import './NoDelegateCall.sol';

import './libraries/LowGasSafeMath.sol';
import './libraries/SafeCast.sol';
import './libraries/Tick.sol';
import './libraries/TickBitmap.sol';
import './libraries/Position.sol';
import './libraries/Oracle.sol';

import './libraries/FullMath.sol';
import './libraries/FixedPoint128.sol';
import './libraries/TransferHelper.sol';
import './libraries/TickMath.sol';
import './libraries/LiquidityMath.sol';
import './libraries/SqrtPriceMath.sol';
import './libraries/SwapMath.sol';

import './interfaces/IUniswapV3PoolDeployer.sol';
import './interfaces/IUniswapV3Factory.sol';
import './interfaces/IERC20Minimal.sol';
import './interfaces/callback/IUniswapV3MintCallback.sol';
import './interfaces/callback/IUniswapV3SwapCallback.sol';
import './interfaces/callback/IUniswapV3FlashCallback.sol';

contract UniswapV3Pool is IUniswapV3Pool, NoDelegateCall {
    using LowGasSafeMath for uint256;
    using LowGasSafeMath for int256;
    using SafeCast for uint256;
    using SafeCast for int256;
    using Tick for mapping(int24 => Tick.Info);
    using TickBitmap for mapping(int16 => uint256);
    using Position for mapping(bytes32 => Position.Info);
    using Position for Position.Info;
    using Oracle for Oracle.Observation[65535];

    /// @inheritdoc IUniswapV3PoolImmutables
    address public immutable override factory;
    /// @inheritdoc IUniswapV3PoolImmutables
    address public immutable override token0;
    /// @inheritdoc IUniswapV3PoolImmutables
    address public immutable override token1;
    /// @inheritdoc IUniswapV3PoolImmutables
    uint24 public immutable override fee;

    /// @inheritdoc IUniswapV3PoolImmutables
    int24 public immutable override tickSpacing;

    /// @inheritdoc IUniswapV3PoolImmutables
    uint128 public immutable override maxLiquidityPerTick;

    struct Slot0 {
        // the current price
        uint160 sqrtPriceX96;
        // the current tick
        int24 tick;
        // the most-recently updated index of the observations array
        uint16 observationIndex;
        // the current maximum number of observations that are being stored
        uint16 observationCardinality;
        // the next maximum number of observations to store, triggered in observations.write
        uint16 observationCardinalityNext;
        // the current protocol fee as a percentage of the swap fee taken on withdrawal
        // represented as an integer denominator (1/x)%
        uint8 feeProtocol;
        // whether the pool is locked
        bool unlocked;
    }
    /// @inheritdoc IUniswapV3PoolState
    Slot0 public override slot0;

    /// @inheritdoc IUniswapV3PoolState
    uint256 public override feeGrowthGlobal0X128;
    /// @inheritdoc IUniswapV3PoolState
    uint256 public override feeGrowthGlobal1X128;

    // accumulated protocol fees in token0/token1 units
    struct ProtocolFees {
        uint128 token0;
        uint128 token1;
    }
    /// @inheritdoc IUniswapV3PoolState
    ProtocolFees public override protocolFees;

    /// @inheritdoc IUniswapV3PoolState
    uint128 public override liquidity;

    /// @inheritdoc IUniswapV3PoolState
    mapping(int24 => Tick.Info) public override ticks;
    /// @inheritdoc IUniswapV3PoolState
    mapping(int16 => uint256) public override tickBitmap;
    /// @inheritdoc IUniswapV3PoolState
    mapping(bytes32 => Position.Info) public override positions;
    /// @inheritdoc IUniswapV3PoolState
    Oracle.Observation[65535] public override observations;

    /// @dev Mutually exclusive reentrancy protection into the pool to/from a method. This method also prevents entrance
    /// to a function before the pool is initialized. The reentrancy guard is required throughout the contract because
    /// we use balance checks to determine the payment status of interactions such as mint, swap and flash.
    modifier lock() {
        require(slot0.unlocked, 'LOK');
        slot0.unlocked = false;
        _;
        slot0.unlocked = true;
    }

    /// @dev Prevents calling a function from anyone except the address returned by IUniswapV3Factory#owner()
    modifier onlyFactoryOwner() {
        require(msg.sender == IUniswapV3Factory(factory).owner());
        _;
    }

    constructor() {
        int24 _tickSpacing;
        (factory, token0, token1, fee, _tickSpacing) = IUniswapV3PoolDeployer(msg.sender).parameters();
        tickSpacing = _tickSpacing;

        maxLiquidityPerTick = Tick.tickSpacingToMaxLiquidityPerTick(_tickSpacing);
    }

    /// @dev Common checks for valid tick inputs.
    function checkTicks(int24 tickLower, int24 tickUpper) private pure {
        require(tickLower < tickUpper, 'TLU');
        require(tickLower >= TickMath.MIN_TICK, 'TLM');
        require(tickUpper <= TickMath.MAX_TICK, 'TUM');
    }

    /// @dev Returns the block timestamp truncated to 32 bits, i.e. mod 2**32. This method is overridden in tests.
    function _blockTimestamp() internal view virtual returns (uint32) {
        return uint32(block.timestamp); // truncation is desired
    }

    /// @dev Get the pool's balance of token0
    /// @dev This function is gas optimized to avoid a redundant extcodesize check in addition to the returndatasize
    /// check
    function balance0() private view returns (uint256) {
        (bool success, bytes memory data) =
            token0.staticcall(abi.encodeWithSelector(IERC20Minimal.balanceOf.selector, address(this)));
        require(success && data.length >= 32);
        return abi.decode(data, (uint256));
    }

    /// @dev Get the pool's balance of token1
    /// @dev This function is gas optimized to avoid a redundant extcodesize check in addition to the returndatasize
    /// check
    function balance1() private view returns (uint256) {
        (bool success, bytes memory data) =
            token1.staticcall(abi.encodeWithSelector(IERC20Minimal.balanceOf.selector, address(this)));
        require(success && data.length >= 32);
        return abi.decode(data, (uint256));
    }

    /// @inheritdoc IUniswapV3PoolDerivedState
    function snapshotCumulativesInside(int24 tickLower, int24 tickUpper)
        external
        view
        override
        noDelegateCall
        returns (
            int56 tickCumulativeInside,
            uint160 secondsPerLiquidityInsideX128,
            uint32 secondsInside
        )
    {
        checkTicks(tickLower, tickUpper);

        int56 tickCumulativeLower;
        int56 tickCumulativeUpper;
        uint160 secondsPerLiquidityOutsideLowerX128;
        uint160 secondsPerLiquidityOutsideUpperX128;
        uint32 secondsOutsideLower;
        uint32 secondsOutsideUpper;

        {
            Tick.Info storage lower = ticks[tickLower];
            Tick.Info storage upper = ticks[tickUpper];
            bool initializedLower;
            (tickCumulativeLower, secondsPerLiquidityOutsideLowerX128, secondsOutsideLower, initializedLower) = (
                lower.tickCumulativeOutside,
                lower.secondsPerLiquidityOutsideX128,
                lower.secondsOutside,
                lower.initialized
            );
            require(initializedLower);

            bool initializedUpper;
            (tickCumulativeUpper, secondsPerLiquidityOutsideUpperX128, secondsOutsideUpper, initializedUpper) = (
                upper.tickCumulativeOutside,
                upper.secondsPerLiquidityOutsideX128,
                upper.secondsOutside,
                upper.initialized
            );
            require(initializedUpper);
        }

        Slot0 memory _slot0 = slot0;

        if (_slot0.tick < tickLower) {
            return (
                tickCumulativeLower - tickCumulativeUpper,
                secondsPerLiquidityOutsideLowerX128 - secondsPerLiquidityOutsideUpperX128,
                secondsOutsideLower - secondsOutsideUpper
            );
        } else if (_slot0.tick < tickUpper) {
            uint32 time = _blockTimestamp();
            (int56 tickCumulative, uint160 secondsPerLiquidityCumulativeX128) =
                observations.observeSingle(
                    time,
                    0,
                    _slot0.tick,
                    _slot0.observationIndex,
                    liquidity,
                    _slot0.observationCardinality
                );
            return (
                tickCumulative - tickCumulativeLower - tickCumulativeUpper,
                secondsPerLiquidityCumulativeX128 -
                    secondsPerLiquidityOutsideLowerX128 -
                    secondsPerLiquidityOutsideUpperX128,
                time - secondsOutsideLower - secondsOutsideUpper
            );
        } else {
            return (
                tickCumulativeUpper - tickCumulativeLower,
                secondsPerLiquidityOutsideUpperX128 - secondsPerLiquidityOutsideLowerX128,
                secondsOutsideUpper - secondsOutsideLower
            );
        }
    }

    /// @inheritdoc IUniswapV3PoolDerivedState
    function observe(uint32[] calldata secondsAgos)
        external
        view
        override
        noDelegateCall
        returns (int56[] memory tickCumulatives, uint160[] memory secondsPerLiquidityCumulativeX128s)
    {
        return
            observations.observe(
                _blockTimestamp(),
                secondsAgos,
                slot0.tick,
                slot0.observationIndex,
                liquidity,
                slot0.observationCardinality
            );
    }

    /// @inheritdoc IUniswapV3PoolActions
    function increaseObservationCardinalityNext(uint16 observationCardinalityNext)
        external
        override
        lock
        noDelegateCall
    {
        uint16 observationCardinalityNextOld = slot0.observationCardinalityNext; // for the event
        uint16 observationCardinalityNextNew =
            observations.grow(observationCardinalityNextOld, observationCardinalityNext);
        slot0.observationCardinalityNext = observationCardinalityNextNew;
        if (observationCardinalityNextOld != observationCardinalityNextNew)
            emit IncreaseObservationCardinalityNext(observationCardinalityNextOld, observationCardinalityNextNew);
    }

    /// @inheritdoc IUniswapV3PoolActions
    /// @dev not locked because it initializes unlocked
    function initialize(uint160 sqrtPriceX96) external override {
        require(slot0.sqrtPriceX96 == 0, 'AI');

        int24 tick = TickMath.getTickAtSqrtRatio(sqrtPriceX96);

        (uint16 cardinality, uint16 cardinalityNext) = observations.initialize(_blockTimestamp());

        slot0 = Slot0({
            sqrtPriceX96: sqrtPriceX96,
            tick: tick,
            observationIndex: 0,
            observationCardinality: cardinality,
            observationCardinalityNext: cardinalityNext,
            feeProtocol: 0,
            unlocked: true
        });

        emit Initialize(sqrtPriceX96, tick);
    }

    struct ModifyPositionParams {
        // the address that owns the position
        address owner;
        // the lower and upper tick of the position
        int24 tickLower;
        int24 tickUpper;
        // any change in liquidity
        int128 liquidityDelta;
    }

    /// @dev Effect some changes to a position
    /// @param params the position details and the change to the position's liquidity to effect
    /// @return position a storage pointer referencing the position with the given owner and tick range
    /// @return amount0 the amount of token0 owed to the pool, negative if the pool should pay the recipient
    /// @return amount1 the amount of token1 owed to the pool, negative if the pool should pay the recipient
    function _modifyPosition(ModifyPositionParams memory params)
        private
        noDelegateCall
        returns (
            Position.Info storage position,
            int256 amount0,
            int256 amount1
        )
    {
        checkTicks(params.tickLower, params.tickUpper);

        Slot0 memory _slot0 = slot0; // SLOAD for gas optimization

        position = _updatePosition(
            params.owner,
            params.tickLower,
            params.tickUpper,
            params.liquidityDelta,
            _slot0.tick
        );

        if (params.liquidityDelta != 0) {
            if (_slot0.tick < params.tickLower) {
                // current tick is below the passed range; liquidity can only become in range by crossing from left to
                // right, when we'll need _more_ token0 (it's becoming more valuable) so user must provide it
                amount0 = SqrtPriceMath.getAmount0Delta(
                    TickMath.getSqrtRatioAtTick(params.tickLower),
                    TickMath.getSqrtRatioAtTick(params.tickUpper),
                    params.liquidityDelta
                );
            } else if (_slot0.tick < params.tickUpper) {
                // current tick is inside the passed range
                uint128 liquidityBefore = liquidity; // SLOAD for gas optimization

                // write an oracle entry
                (slot0.observationIndex, slot0.observationCardinality) = observations.write(
                    _slot0.observationIndex,
                    _blockTimestamp(),
                    _slot0.tick,
                    liquidityBefore,
                    _slot0.observationCardinality,
                    _slot0.observationCardinalityNext
                );

                amount0 = SqrtPriceMath.getAmount0Delta(
                    _slot0.sqrtPriceX96,
                    TickMath.getSqrtRatioAtTick(params.tickUpper),
                    params.liquidityDelta
                );
                amount1 = SqrtPriceMath.getAmount1Delta(
                    TickMath.getSqrtRatioAtTick(params.tickLower),
                    _slot0.sqrtPriceX96,
                    params.liquidityDelta
                );

                liquidity = LiquidityMath.addDelta(liquidityBefore, params.liquidityDelta);
            } else {
                // current tick is above the passed range; liquidity can only become in range by crossing from right to
                // left, when we'll need _more_ token1 (it's becoming more valuable) so user must provide it
                amount1 = SqrtPriceMath.getAmount1Delta(
                    TickMath.getSqrtRatioAtTick(params.tickLower),
                    TickMath.getSqrtRatioAtTick(params.tickUpper),
                    params.liquidityDelta
                );
            }
        }
    }

    /// @dev Gets and updates a position with the given liquidity delta
    /// @param owner the owner of the position
    /// @param tickLower the lower tick of the position's tick range
    /// @param tickUpper the upper tick of the position's tick range
    /// @param tick the current tick, passed to avoid sloads
    function _updatePosition(
        address owner,
        int24 tickLower,
        int24 tickUpper,
        int128 liquidityDelta,
        int24 tick
    ) private returns (Position.Info storage position) {
        position = positions.get(owner, tickLower, tickUpper);

        uint256 _feeGrowthGlobal0X128 = feeGrowthGlobal0X128; // SLOAD for gas optimization
        uint256 _feeGrowthGlobal1X128 = feeGrowthGlobal1X128; // SLOAD for gas optimization

        // if we need to update the ticks, do it
        bool flippedLower;
        bool flippedUpper;
        if (liquidityDelta != 0) {
            uint32 time = _blockTimestamp();
            (int56 tickCumulative, uint160 secondsPerLiquidityCumulativeX128) =
                observations.observeSingle(
                    time,
                    0,
                    slot0.tick,
                    slot0.observationIndex,
                    liquidity,
                    slot0.observationCardinality
                );

            flippedLower = ticks.update(
                tickLower,
                tick,
                liquidityDelta,
                _feeGrowthGlobal0X128,
                _feeGrowthGlobal1X128,
                secondsPerLiquidityCumulativeX128,
                tickCumulative,
                time,
                false,
                maxLiquidityPerTick
            );
            flippedUpper = ticks.update(
                tickUpper,
                tick,
                liquidityDelta,
                _feeGrowthGlobal0X128,
                _feeGrowthGlobal1X128,
                secondsPerLiquidityCumulativeX128,
                tickCumulative,
                time,
                true,
                maxLiquidityPerTick
            );

            if (flippedLower) {
                tickBitmap.flipTick(tickLower, tickSpacing);
            }
            if (flippedUpper) {
                tickBitmap.flipTick(tickUpper, tickSpacing);
            }
        }

        (uint256 feeGrowthInside0X128, uint256 feeGrowthInside1X128) =
            ticks.getFeeGrowthInside(tickLower, tickUpper, tick, _feeGrowthGlobal0X128, _feeGrowthGlobal1X128);

        position.update(liquidityDelta, feeGrowthInside0X128, feeGrowthInside1X128);

        // clear any tick data that is no longer needed
        if (liquidityDelta < 0) {
            if (flippedLower) {
                ticks.clear(tickLower);
            }
            if (flippedUpper) {
                ticks.clear(tickUpper);
            }
        }
    }

    /// @inheritdoc IUniswapV3PoolActions
    /// @dev noDelegateCall is applied indirectly via _modifyPosition
    function mint(
        address recipient,
        int24 tickLower,
        int24 tickUpper,
        uint128 amount,
        bytes calldata data
    ) external override lock returns (uint256 amount0, uint256 amount1) {
        require(amount > 0);
        (, int256 amount0Int, int256 amount1Int) =
            _modifyPosition(
                ModifyPositionParams({
                    owner: recipient,
                    tickLower: tickLower,
                    tickUpper: tickUpper,
                    liquidityDelta: int256(amount).toInt128()
                })
            );

        amount0 = uint256(amount0Int);
        amount1 = uint256(amount1Int);

        uint256 balance0Before;
        uint256 balance1Before;
        if (amount0 > 0) balance0Before = balance0();
        if (amount1 > 0) balance1Before = balance1();
        IUniswapV3MintCallback(msg.sender).uniswapV3MintCallback(amount0, amount1, data);
        if (amount0 > 0) require(balance0Before.add(amount0) <= balance0(), 'M0');
        if (amount1 > 0) require(balance1Before.add(amount1) <= balance1(), 'M1');

        emit Mint(msg.sender, recipient, tickLower, tickUpper, amount, amount0, amount1);
    }

    /// @inheritdoc IUniswapV3PoolActions
    function collect(
        address recipient,
        int24 tickLower,
        int24 tickUpper,
        uint128 amount0Requested,
        uint128 amount1Requested
    ) external override lock returns (uint128 amount0, uint128 amount1) {
        // we don't need to checkTicks here, because invalid positions will never have non-zero tokensOwed{0,1}
        Position.Info storage position = positions.get(msg.sender, tickLower, tickUpper);

        amount0 = amount0Requested > position.tokensOwed0 ? position.tokensOwed0 : amount0Requested;
        amount1 = amount1Requested > position.tokensOwed1 ? position.tokensOwed1 : amount1Requested;

        if (amount0 > 0) {
            position.tokensOwed0 -= amount0;
            TransferHelper.safeTransfer(token0, recipient, amount0);
        }
        if (amount1 > 0) {
            position.tokensOwed1 -= amount1;
            TransferHelper.safeTransfer(token1, recipient, amount1);
        }

        emit Collect(msg.sender, recipient, tickLower, tickUpper, amount0, amount1);
    }

    /// @inheritdoc IUniswapV3PoolActions
    /// @dev noDelegateCall is applied indirectly via _modifyPosition
    function burn(
        int24 tickLower,
        int24 tickUpper,
        uint128 amount
    ) external override lock returns (uint256 amount0, uint256 amount1) {
        (Position.Info storage position, int256 amount0Int, int256 amount1Int) =
            _modifyPosition(
                ModifyPositionParams({
                    owner: msg.sender,
                    tickLower: tickLower,
                    tickUpper: tickUpper,
                    liquidityDelta: -int256(amount).toInt128()
                })
            );

        amount0 = uint256(-amount0Int);
        amount1 = uint256(-amount1Int);

        if (amount0 > 0 || amount1 > 0) {
            (position.tokensOwed0, position.tokensOwed1) = (
                position.tokensOwed0 + uint128(amount0),
                position.tokensOwed1 + uint128(amount1)
            );
        }

        emit Burn(msg.sender, tickLower, tickUpper, amount, amount0, amount1);
    }

    struct SwapCache {
        // the protocol fee for the input token
        uint8 feeProtocol;
        // liquidity at the beginning of the swap
        uint128 liquidityStart;
        // the timestamp of the current block
        uint32 blockTimestamp;
        // the current value of the tick accumulator, computed only if we cross an initialized tick
        int56 tickCumulative;
        // the current value of seconds per liquidity accumulator, computed only if we cross an initialized tick
        uint160 secondsPerLiquidityCumulativeX128;
        // whether we've computed and cached the above two accumulators
        bool computedLatestObservation;
    }

    // the top level state of the swap, the results of which are recorded in storage at the end
    struct SwapState {
        // the amount remaining to be swapped in/out of the input/output asset
        int256 amountSpecifiedRemaining;
        // the amount already swapped out/in of the output/input asset
        int256 amountCalculated;
        // current sqrt(price)
        uint160 sqrtPriceX96;
        // the tick associated with the current price
        int24 tick;
        // the global fee growth of the input token
        uint256 feeGrowthGlobalX128;
        // amount of input token paid as protocol fee
        uint128 protocolFee;
        // the current liquidity in range
        uint128 liquidity;
    }

    struct StepComputations {
        // the price at the beginning of the step
        uint160 sqrtPriceStartX96;
        // the next tick to swap to from the current tick in the swap direction
        int24 tickNext;
        // whether tickNext is initialized or not
        bool initialized;
        // sqrt(price) for the next tick (1/0)
        uint160 sqrtPriceNextX96;
        // how much is being swapped in in this step
        uint256 amountIn;
        // how much is being swapped out
        uint256 amountOut;
        // how much fee is being paid in
        uint256 feeAmount;
    }

    /// @inheritdoc IUniswapV3PoolActions
    function swap(
        address recipient,
        bool zeroForOne,
        int256 amountSpecified,
        uint160 sqrtPriceLimitX96,
        bytes calldata data
    ) external override noDelegateCall returns (int256 amount0, int256 amount1) {
        require(amountSpecified != 0, 'AS');

        Slot0 memory slot0Start = slot0;

        require(slot0Start.unlocked, 'LOK');
        require(
            zeroForOne
                ? sqrtPriceLimitX96 < slot0Start.sqrtPriceX96 && sqrtPriceLimitX96 > TickMath.MIN_SQRT_RATIO
                : sqrtPriceLimitX96 > slot0Start.sqrtPriceX96 && sqrtPriceLimitX96 < TickMath.MAX_SQRT_RATIO,
            'SPL'
        );

        slot0.unlocked = false;

        SwapCache memory cache =
            SwapCache({
                liquidityStart: liquidity,
                blockTimestamp: _blockTimestamp(),
                feeProtocol: zeroForOne ? (slot0Start.feeProtocol % 16) : (slot0Start.feeProtocol >> 4),
                secondsPerLiquidityCumulativeX128: 0,
                tickCumulative: 0,
                computedLatestObservation: false
            });

        bool exactInput = amountSpecified > 0;

        SwapState memory state =
            SwapState({
                amountSpecifiedRemaining: amountSpecified,
                amountCalculated: 0,
                sqrtPriceX96: slot0Start.sqrtPriceX96,
                tick: slot0Start.tick,
                feeGrowthGlobalX128: zeroForOne ? feeGrowthGlobal0X128 : feeGrowthGlobal1X128,
                protocolFee: 0,
                liquidity: cache.liquidityStart
            });

        // continue swapping as long as we haven't used the entire input/output and haven't reached the price limit
        while (state.amountSpecifiedRemaining != 0 && state.sqrtPriceX96 != sqrtPriceLimitX96) {
            StepComputations memory step;

            step.sqrtPriceStartX96 = state.sqrtPriceX96;

            (step.tickNext, step.initialized) = tickBitmap.nextInitializedTickWithinOneWord(
                state.tick,
                tickSpacing,
                zeroForOne
            );

            // ensure that we do not overshoot the min/max tick, as the tick bitmap is not aware of these bounds
            if (step.tickNext < TickMath.MIN_TICK) {
                step.tickNext = TickMath.MIN_TICK;
            } else if (step.tickNext > TickMath.MAX_TICK) {
                step.tickNext = TickMath.MAX_TICK;
            }

            // get the price for the next tick
            step.sqrtPriceNextX96 = TickMath.getSqrtRatioAtTick(step.tickNext);

            // compute values to swap to the target tick, price limit, or point where input/output amount is exhausted
            (state.sqrtPriceX96, step.amountIn, step.amountOut, step.feeAmount) = SwapMath.computeSwapStep(
                state.sqrtPriceX96,
                (zeroForOne ? step.sqrtPriceNextX96 < sqrtPriceLimitX96 : step.sqrtPriceNextX96 > sqrtPriceLimitX96)
                    ? sqrtPriceLimitX96
                    : step.sqrtPriceNextX96,
                state.liquidity,
                state.amountSpecifiedRemaining,
                fee
            );

            if (exactInput) {
                state.amountSpecifiedRemaining -= (step.amountIn + step.feeAmount).toInt256();
                state.amountCalculated = state.amountCalculated.sub(step.amountOut.toInt256());
            } else {
                state.amountSpecifiedRemaining += step.amountOut.toInt256();
                state.amountCalculated = state.amountCalculated.add((step.amountIn + step.feeAmount).toInt256());
            }

            // if the protocol fee is on, calculate how much is owed, decrement feeAmount, and increment protocolFee
            if (cache.feeProtocol > 0) {
                uint256 delta = step.feeAmount / cache.feeProtocol;
                step.feeAmount -= delta;
                state.protocolFee += uint128(delta);
            }

            // update global fee tracker
            if (state.liquidity > 0)
                state.feeGrowthGlobalX128 += FullMath.mulDiv(step.feeAmount, FixedPoint128.Q128, state.liquidity);

            // shift tick if we reached the next price
            if (state.sqrtPriceX96 == step.sqrtPriceNextX96) {
                // if the tick is initialized, run the tick transition
                if (step.initialized) {
                    // check for the placeholder value, which we replace with the actual value the first time the swap
                    // crosses an initialized tick
                    if (!cache.computedLatestObservation) {
                        (cache.tickCumulative, cache.secondsPerLiquidityCumulativeX128) = observations.observeSingle(
                            cache.blockTimestamp,
                            0,
                            slot0Start.tick,
                            slot0Start.observationIndex,
                            cache.liquidityStart,
                            slot0Start.observationCardinality
                        );
                        cache.computedLatestObservation = true;
                    }
                    int128 liquidityNet =
                        ticks.cross(
                            step.tickNext,
                            (zeroForOne ? state.feeGrowthGlobalX128 : feeGrowthGlobal0X128),
                            (zeroForOne ? feeGrowthGlobal1X128 : state.feeGrowthGlobalX128),
                            cache.secondsPerLiquidityCumulativeX128,
                            cache.tickCumulative,
                            cache.blockTimestamp
                        );
                    // if we're moving leftward, we interpret liquidityNet as the opposite sign
                    // safe because liquidityNet cannot be type(int128).min
                    if (zeroForOne) liquidityNet = -liquidityNet;

                    state.liquidity = LiquidityMath.addDelta(state.liquidity, liquidityNet);
                }

                state.tick = zeroForOne ? step.tickNext - 1 : step.tickNext;
            } else if (state.sqrtPriceX96 != step.sqrtPriceStartX96) {
                // recompute unless we're on a lower tick boundary (i.e. already transitioned ticks), and haven't moved
                state.tick = TickMath.getTickAtSqrtRatio(state.sqrtPriceX96);
            }
        }

        // update tick and write an oracle entry if the tick change
        if (state.tick != slot0Start.tick) {
            (uint16 observationIndex, uint16 observationCardinality) =
                observations.write(
                    slot0Start.observationIndex,
                    cache.blockTimestamp,
                    slot0Start.tick,
                    cache.liquidityStart,
                    slot0Start.observationCardinality,
                    slot0Start.observationCardinalityNext
                );
            (slot0.sqrtPriceX96, slot0.tick, slot0.observationIndex, slot0.observationCardinality) = (
                state.sqrtPriceX96,
                state.tick,
                observationIndex,
                observationCardinality
            );
        } else {
            // otherwise just update the price
            slot0.sqrtPriceX96 = state.sqrtPriceX96;
        }

        // update liquidity if it changed
        if (cache.liquidityStart != state.liquidity) liquidity = state.liquidity;

        // update fee growth global and, if necessary, protocol fees
        // overflow is acceptable, protocol has to withdraw before it hits type(uint128).max fees
        if (zeroForOne) {
            feeGrowthGlobal0X128 = state.feeGrowthGlobalX128;
            if (state.protocolFee > 0) protocolFees.token0 += state.protocolFee;
        } else {
            feeGrowthGlobal1X128 = state.feeGrowthGlobalX128;
            if (state.protocolFee > 0) protocolFees.token1 += state.protocolFee;
        }

        (amount0, amount1) = zeroForOne == exactInput
            ? (amountSpecified - state.amountSpecifiedRemaining, state.amountCalculated)
            : (state.amountCalculated, amountSpecified - state.amountSpecifiedRemaining);

        // do the transfers and collect payment
        if (zeroForOne) {
            if (amount1 < 0) TransferHelper.safeTransfer(token1, recipient, uint256(-amount1));

            uint256 balance0Before = balance0();
            IUniswapV3SwapCallback(msg.sender).uniswapV3SwapCallback(amount0, amount1, data);
            require(balance0Before.add(uint256(amount0)) <= balance0(), 'IIA');
        } else {
            if (amount0 < 0) TransferHelper.safeTransfer(token0, recipient, uint256(-amount0));

            uint256 balance1Before = balance1();
            IUniswapV3SwapCallback(msg.sender).uniswapV3SwapCallback(amount0, amount1, data);
            require(balance1Before.add(uint256(amount1)) <= balance1(), 'IIA');
        }

        emit Swap(msg.sender, recipient, amount0, amount1, state.sqrtPriceX96, state.liquidity, state.tick);
        slot0.unlocked = true;
    }

    /// @inheritdoc IUniswapV3PoolActions
    function flash(
        address recipient,
        uint256 amount0,
        uint256 amount1,
        bytes calldata data
    ) external override lock noDelegateCall {
        uint128 _liquidity = liquidity;
        require(_liquidity > 0, 'L');

        uint256 fee0 = FullMath.mulDivRoundingUp(amount0, fee, 1e6);
        uint256 fee1 = FullMath.mulDivRoundingUp(amount1, fee, 1e6);
        uint256 balance0Before = balance0();
        uint256 balance1Before = balance1();

        if (amount0 > 0) TransferHelper.safeTransfer(token0, recipient, amount0);
        if (amount1 > 0) TransferHelper.safeTransfer(token1, recipient, amount1);

        IUniswapV3FlashCallback(msg.sender).uniswapV3FlashCallback(fee0, fee1, data);

        uint256 balance0After = balance0();
        uint256 balance1After = balance1();

        require(balance0Before.add(fee0) <= balance0After, 'F0');
        require(balance1Before.add(fee1) <= balance1After, 'F1');

        // sub is safe because we know balanceAfter is gt balanceBefore by at least fee
        uint256 paid0 = balance0After - balance0Before;
        uint256 paid1 = balance1After - balance1Before;

        if (paid0 > 0) {
            uint8 feeProtocol0 = slot0.feeProtocol % 16;
            uint256 fees0 = feeProtocol0 == 0 ? 0 : paid0 / feeProtocol0;
            if (uint128(fees0) > 0) protocolFees.token0 += uint128(fees0);
            feeGrowthGlobal0X128 += FullMath.mulDiv(paid0 - fees0, FixedPoint128.Q128, _liquidity);
        }
        if (paid1 > 0) {
            uint8 feeProtocol1 = slot0.feeProtocol >> 4;
            uint256 fees1 = feeProtocol1 == 0 ? 0 : paid1 / feeProtocol1;
            if (uint128(fees1) > 0) protocolFees.token1 += uint128(fees1);
            feeGrowthGlobal1X128 += FullMath.mulDiv(paid1 - fees1, FixedPoint128.Q128, _liquidity);
        }

        emit Flash(msg.sender, recipient, amount0, amount1, paid0, paid1);
    }

    /// @inheritdoc IUniswapV3PoolOwnerActions
    function setFeeProtocol(uint8 feeProtocol0, uint8 feeProtocol1) external override lock onlyFactoryOwner {
        require(
            (feeProtocol0 == 0 || (feeProtocol0 >= 4 && feeProtocol0 <= 10)) &&
                (feeProtocol1 == 0 || (feeProtocol1 >= 4 && feeProtocol1 <= 10))
        );
        uint8 feeProtocolOld = slot0.feeProtocol;
        slot0.feeProtocol = feeProtocol0 + (feeProtocol1 << 4);
        emit SetFeeProtocol(feeProtocolOld % 16, feeProtocolOld >> 4, feeProtocol0, feeProtocol1);
    }

    /// @inheritdoc IUniswapV3PoolOwnerActions
    function collectProtocol(
        address recipient,
        uint128 amount0Requested,
        uint128 amount1Requested
    ) external override lock onlyFactoryOwner returns (uint128 amount0, uint128 amount1) {
        amount0 = amount0Requested > protocolFees.token0 ? protocolFees.token0 : amount0Requested;
        amount1 = amount1Requested > protocolFees.token1 ? protocolFees.token1 : amount1Requested;

        if (amount0 > 0) {
            if (amount0 == protocolFees.token0) amount0--; // ensure that the slot is not cleared, for gas savings
            protocolFees.token0 -= amount0;
            TransferHelper.safeTransfer(token0, recipient, amount0);
        }
        if (amount1 > 0) {
            if (amount1 == protocolFees.token1) amount1--; // ensure that the slot is not cleared, for gas savings
            protocolFees.token1 -= amount1;
            TransferHelper.safeTransfer(token1, recipient, amount1);
        }

        emit CollectProtocol(msg.sender, recipient, amount0, amount1);
    }
}

Contract ABI

[
 {
  "type": "constructor",
  "inputs": [],
  "stateMutability": "nonpayable"
 },
 {
  "name": "Burn",
  "type": "event",
  "inputs": [
   {
    "name": "owner",
    "type": "address",
    "indexed": true,
    "internalType": "address"
   },
   {
    "name": "tickLower",
    "type": "int24",
    "indexed": true,
    "internalType": "int24"
   },
   {
    "name": "tickUpper",
    "type": "int24",
    "indexed": true,
    "internalType": "int24"
   },
   {
    "name": "amount",
    "type": "uint128",
    "indexed": false,
    "internalType": "uint128"
   },
   {
    "name": "amount0",
    "type": "uint256",
    "indexed": false,
    "internalType": "uint256"
   },
   {
    "name": "amount1",
    "type": "uint256",
    "indexed": false,
    "internalType": "uint256"
   }
  ],
  "anonymous": false
 },
 {
  "name": "Collect",
  "type": "event",
  "inputs": [
   {
    "name": "owner",
    "type": "address",
    "indexed": true,
    "internalType": "address"
   },
   {
    "name": "recipient",
    "type": "address",
    "indexed": false,
    "internalType": "address"
   },
   {
    "name": "tickLower",
    "type": "int24",
    "indexed": true,
    "internalType": "int24"
   },
   {
    "name": "tickUpper",
    "type": "int24",
    "indexed": true,
    "internalType": "int24"
   },
   {
    "name": "amount0",
    "type": "uint128",
    "indexed": false,
    "internalType": "uint128"
   },
   {
    "name": "amount1",
    "type": "uint128",
    "indexed": false,
    "internalType": "uint128"
   }
  ],
  "anonymous": false
 },
 {
  "name": "CollectProtocol",
  "type": "event",
  "inputs": [
   {
    "name": "sender",
    "type": "address",
    "indexed": true,
    "internalType": "address"
   },
   {
    "name": "recipient",
    "type": "address",
    "indexed": true,
    "internalType": "address"
   },
   {
    "name": "amount0",
    "type": "uint128",
    "indexed": false,
    "internalType": "uint128"
   },
   {
    "name": "amount1",
    "type": "uint128",
    "indexed": false,
    "internalType": "uint128"
   }
  ],
  "anonymous": false
 },
 {
  "name": "Flash",
  "type": "event",
  "inputs": [
   {
    "name": "sender",
    "type": "address",
    "indexed": true,
    "internalType": "address"
   },
   {
    "name": "recipient",
    "type": "address",
    "indexed": true,
    "internalType": "address"
   },
   {
    "name": "amount0",
    "type": "uint256",
    "indexed": false,
    "internalType": "uint256"
   },
   {
    "name": "amount1",
    "type": "uint256",
    "indexed": false,
    "internalType": "uint256"
   },
   {
    "name": "paid0",
    "type": "uint256",
    "indexed": false,
    "internalType": "uint256"
   },
   {
    "name": "paid1",
    "type": "uint256",
    "indexed": false,
    "internalType": "uint256"
   }
  ],
  "anonymous": false
 },
 {
  "name": "IncreaseObservationCardinalityNext",
  "type": "event",
  "inputs": [
   {
    "name": "observationCardinalityNextOld",
    "type": "uint16",
    "indexed": false,
    "internalType": "uint16"
   },
   {
    "name": "observationCardinalityNextNew",
    "type": "uint16",
    "indexed": false,
    "internalType": "uint16"
   }
  ],
  "anonymous": false
 },
 {
  "name": "Initialize",
  "type": "event",
  "inputs": [
   {
    "name": "sqrtPriceX96",
    "type": "uint160",
    "indexed": false,
    "internalType": "uint160"
   },
   {
    "name": "tick",
    "type": "int24",
    "indexed": false,
    "internalType": "int24"
   }
  ],
  "anonymous": false
 },
 {
  "name": "Mint",
  "type": "event",
  "inputs": [
   {
    "name": "sender",
    "type": "address",
    "indexed": false,
    "internalType": "address"
   },
   {
    "name": "owner",
    "type": "address",
    "indexed": true,
    "internalType": "address"
   },
   {
    "name": "tickLower",
    "type": "int24",
    "indexed": true,
    "internalType": "int24"
   },
   {
    "name": "tickUpper",
    "type": "int24",
    "indexed": true,
    "internalType": "int24"
   },
   {
    "name": "amount",
    "type": "uint128",
    "indexed": false,
    "internalType": "uint128"
   },
   {
    "name": "amount0",
    "type": "uint256",
    "indexed": false,
    "internalType": "uint256"
   },
   {
    "name": "amount1",
    "type": "uint256",
    "indexed": false,
    "internalType": "uint256"
   }
  ],
  "anonymous": false
 },
 {
  "name": "SetFeeProtocol",
  "type": "event",
  "inputs": [
   {
    "name": "feeProtocol0Old",
    "type": "uint8",
    "indexed": false,
    "internalType": "uint8"
   },
   {
    "name": "feeProtocol1Old",
    "type": "uint8",
    "indexed": false,
    "internalType": "uint8"
   },
   {
    "name": "feeProtocol0New",
    "type": "uint8",
    "indexed": false,
    "internalType": "uint8"
   },
   {
    "name": "feeProtocol1New",
    "type": "uint8",
    "indexed": false,
    "internalType": "uint8"
   }
  ],
  "anonymous": false
 },
 {
  "name": "Swap",
  "type": "event",
  "inputs": [
   {
    "name": "sender",
    "type": "address",
    "indexed": true,
    "internalType": "address"
   },
   {
    "name": "recipient",
    "type": "address",
    "indexed": true,
    "internalType": "address"
   },
   {
    "name": "amount0",
    "type": "int256",
    "indexed": false,
    "internalType": "int256"
   },
   {
    "name": "amount1",
    "type": "int256",
    "indexed": false,
    "internalType": "int256"
   },
   {
    "name": "sqrtPriceX96",
    "type": "uint160",
    "indexed": false,
    "internalType": "uint160"
   },
   {
    "name": "liquidity",
    "type": "uint128",
    "indexed": false,
    "internalType": "uint128"
   },
   {
    "name": "tick",
    "type": "int24",
    "indexed": false,
    "internalType": "int24"
   }
  ],
  "anonymous": false
 },
 {
  "name": "burn",
  "type": "function",
  "inputs": [
   {
    "name": "tickLower",
    "type": "int24",
    "internalType": "int24"
   },
   {
    "name": "tickUpper",
    "type": "int24",
    "internalType": "int24"
   },
   {
    "name": "amount",
    "type": "uint128",
    "internalType": "uint128"
   }
  ],
  "outputs": [
   {
    "name": "amount0",
    "type": "uint256",
    "internalType": "uint256"
   },
   {
    "name": "amount1",
    "type": "uint256",
    "internalType": "uint256"
   }
  ],
  "stateMutability": "nonpayable"
 },
 {
  "name": "collect",
  "type": "function",
  "inputs": [
   {
    "name": "recipient",
    "type": "address",
    "internalType": "address"
   },
   {
    "name": "tickLower",
    "type": "int24",
    "internalType": "int24"
   },
   {
    "name": "tickUpper",
    "type": "int24",
    "internalType": "int24"
   },
   {
    "name": "amount0Requested",
    "type": "uint128",
    "internalType": "uint128"
   },
   {
    "name": "amount1Requested",
    "type": "uint128",
    "internalType": "uint128"
   }
  ],
  "outputs": [
   {
    "name": "amount0",
    "type": "uint128",
    "internalType": "uint128"
   },
   {
    "name": "amount1",
    "type": "uint128",
    "internalType": "uint128"
   }
  ],
  "stateMutability": "nonpayable"
 },
 {
  "name": "collectProtocol",
  "type": "function",
  "inputs": [
   {
    "name": "recipient",
    "type": "address",
    "internalType": "address"
   },
   {
    "name": "amount0Requested",
    "type": "uint128",
    "internalType": "uint128"
   },
   {
    "name": "amount1Requested",
    "type": "uint128",
    "internalType": "uint128"
   }
  ],
  "outputs": [
   {
    "name": "amount0",
    "type": "uint128",
    "internalType": "uint128"
   },
   {
    "name": "amount1",
    "type": "uint128",
    "internalType": "uint128"
   }
  ],
  "stateMutability": "nonpayable"
 },
 {
  "name": "factory",
  "type": "function",
  "inputs": [],
  "outputs": [
   {
    "name": "",
    "type": "address",
    "internalType": "address"
   }
  ],
  "stateMutability": "view"
 },
 {
  "name": "fee",
  "type": "function",
  "inputs": [],
  "outputs": [
   {
    "name": "",
    "type": "uint24",
    "internalType": "uint24"
   }
  ],
  "stateMutability": "view"
 },
 {
  "name": "feeGrowthGlobal0X128",
  "type": "function",
  "inputs": [],
  "outputs": [
   {
    "name": "",
    "type": "uint256",
    "internalType": "uint256"
   }
  ],
  "stateMutability": "view"
 },
 {
  "name": "feeGrowthGlobal1X128",
  "type": "function",
  "inputs": [],
  "outputs": [
   {
    "name": "",
    "type": "uint256",
    "internalType": "uint256"
   }
  ],
  "stateMutability": "view"
 },
 {
  "name": "flash",
  "type": "function",
  "inputs": [
   {
    "name": "recipient",
    "type": "address",
    "internalType": "address"
   },
   {
    "name": "amount0",
    "type": "uint256",
    "internalType": "uint256"
   },
   {
    "name": "amount1",
    "type": "uint256",
    "internalType": "uint256"
   },
   {
    "name": "data",
    "type": "bytes",
    "internalType": "bytes"
   }
  ],
  "outputs": [],
  "stateMutability": "nonpayable"
 },
 {
  "name": "increaseObservationCardinalityNext",
  "type": "function",
  "inputs": [
   {
    "name": "observationCardinalityNext",
    "type": "uint16",
    "internalType": "uint16"
   }
  ],
  "outputs": [],
  "stateMutability": "nonpayable"
 },
 {
  "name": "initialize",
  "type": "function",
  "inputs": [
   {
    "name": "sqrtPriceX96",
    "type": "uint160",
    "internalType": "uint160"
   }
  ],
  "outputs": [],
  "stateMutability": "nonpayable"
 },
 {
  "name": "liquidity",
  "type": "function",
  "inputs": [],
  "outputs": [
   {
    "name": "",
    "type": "uint128",
    "internalType": "uint128"
   }
  ],
  "stateMutability": "view"
 },
 {
  "name": "maxLiquidityPerTick",
  "type": "function",
  "inputs": [],
  "outputs": [
   {
    "name": "",
    "type": "uint128",
    "internalType": "uint128"
   }
  ],
  "stateMutability": "view"
 },
 {
  "name": "mint",
  "type": "function",
  "inputs": [
   {
    "name": "recipient",
    "type": "address",
    "internalType": "address"
   },
   {
    "name": "tickLower",
    "type": "int24",
    "internalType": "int24"
   },
   {
    "name": "tickUpper",
    "type": "int24",
    "internalType": "int24"
   },
   {
    "name": "amount",
    "type": "uint128",
    "internalType": "uint128"
   },
   {
    "name": "data",
    "type": "bytes",
    "internalType": "bytes"
   }
  ],
  "outputs": [
   {
    "name": "amount0",
    "type": "uint256",
    "internalType": "uint256"
   },
   {
    "name": "amount1",
    "type": "uint256",
    "internalType": "uint256"
   }
  ],
  "stateMutability": "nonpayable"
 },
 {
  "name": "observations",
  "type": "function",
  "inputs": [
   {
    "name": "",
    "type": "uint256",
    "internalType": "uint256"
   }
  ],
  "outputs": [
   {
    "name": "blockTimestamp",
    "type": "uint32",
    "internalType": "uint32"
   },
   {
    "name": "tickCumulative",
    "type": "int56",
    "internalType": "int56"
   },
   {
    "name": "secondsPerLiquidityCumulativeX128",
    "type": "uint160",
    "internalType": "uint160"
   },
   {
    "name": "initialized",
    "type": "bool",
    "internalType": "bool"
   }
  ],
  "stateMutability": "view"
 },
 {
  "name": "observe",
  "type": "function",
  "inputs": [
   {
    "name": "secondsAgos",
    "type": "uint32[]",
    "internalType": "uint32[]"
   }
  ],
  "outputs": [
   {
    "name": "tickCumulatives",
    "type": "int56[]",
    "internalType": "int56[]"
   },
   {
    "name": "secondsPerLiquidityCumulativeX128s",
    "type": "uint160[]",
    "internalType": "uint160[]"
   }
  ],
  "stateMutability": "view"
 },
 {
  "name": "positions",
  "type": "function",
  "inputs": [
   {
    "name": "",
    "type": "bytes32",
    "internalType": "bytes32"
   }
  ],
  "outputs": [
   {
    "name": "liquidity",
    "type": "uint128",
    "internalType": "uint128"
   },
   {
    "name": "feeGrowthInside0LastX128",
    "type": "uint256",
    "internalType": "uint256"
   },
   {
    "name": "feeGrowthInside1LastX128",
    "type": "uint256",
    "internalType": "uint256"
   },
   {
    "name": "tokensOwed0",
    "type": "uint128",
    "internalType": "uint128"
   },
   {
    "name": "tokensOwed1",
    "type": "uint128",
    "internalType": "uint128"
   }
  ],
  "stateMutability": "view"
 },
 {
  "name": "protocolFees",
  "type": "function",
  "inputs": [],
  "outputs": [
   {
    "name": "token0",
    "type": "uint128",
    "internalType": "uint128"
   },
   {
    "name": "token1",
    "type": "uint128",
    "internalType": "uint128"
   }
  ],
  "stateMutability": "view"
 },
 {
  "name": "setFeeProtocol",
  "type": "function",
  "inputs": [
   {
    "name": "feeProtocol0",
    "type": "uint8",
    "internalType": "uint8"
   },
   {
    "name": "feeProtocol1",
    "type": "uint8",
    "internalType": "uint8"
   }
  ],
  "outputs": [],
  "stateMutability": "nonpayable"
 },
 {
  "name": "slot0",
  "type": "function",
  "inputs": [],
  "outputs": [
   {
    "name": "sqrtPriceX96",
    "type": "uint160",
    "internalType": "uint160"
   },
   {
    "name": "tick",
    "type": "int24",
    "internalType": "int24"
   },
   {
    "name": "observationIndex",
    "type": "uint16",
    "internalType": "uint16"
   },
   {
    "name": "observationCardinality",
    "type": "uint16",
    "internalType": "uint16"
   },
   {
    "name": "observationCardinalityNext",
    "type": "uint16",
    "internalType": "uint16"
   },
   {
    "name": "feeProtocol",
    "type": "uint8",
    "internalType": "uint8"
   },
   {
    "name": "unlocked",
    "type": "bool",
    "internalType": "bool"
   }
  ],
  "stateMutability": "view"
 },
 {
  "name": "snapshotCumulativesInside",
  "type": "function",
  "inputs": [
   {
    "name": "tickLower",
    "type": "int24",
    "internalType": "int24"
   },
   {
    "name": "tickUpper",
    "type": "int24",
    "internalType": "int24"
   }
  ],
  "outputs": [
   {
    "name": "tickCumulativeInside",
    "type": "int56",
    "internalType": "int56"
   },
   {
    "name": "secondsPerLiquidityInsideX128",
    "type": "uint160",
    "internalType": "uint160"
   },
   {
    "name": "secondsInside",
    "type": "uint32",
    "internalType": "uint32"
   }
  ],
  "stateMutability": "view"
 },
 {
  "name": "swap",
  "type": "function",
  "inputs": [
   {
    "name": "recipient",
    "type": "address",
    "internalType": "address"
   },
   {
    "name": "zeroForOne",
    "type": "bool",
    "internalType": "bool"
   },
   {
    "name": "amountSpecified",
    "type": "int256",
    "internalType": "int256"
   },
   {
    "name": "sqrtPriceLimitX96",
    "type": "uint160",
    "internalType": "uint160"
   },
   {
    "name": "data",
    "type": "bytes",
    "internalType": "bytes"
   }
  ],
  "outputs": [
   {
    "name": "amount0",
    "type": "int256",
    "internalType": "int256"
   },
   {
    "name": "amount1",
    "type": "int256",
    "internalType": "int256"
   }
  ],
  "stateMutability": "nonpayable"
 },
 {
  "name": "tickBitmap",
  "type": "function",
  "inputs": [
   {
    "name": "",
    "type": "int16",
    "internalType": "int16"
   }
  ],
  "outputs": [
   {
    "name": "",
    "type": "uint256",
    "internalType": "uint256"
   }
  ],
  "stateMutability": "view"
 },
 {
  "name": "tickSpacing",
  "type": "function",
  "inputs": [],
  "outputs": [
   {
    "name": "",
    "type": "int24",
    "internalType": "int24"
   }
  ],
  "stateMutability": "view"
 },
 {
  "name": "ticks",
  "type": "function",
  "inputs": [
   {
    "name": "",
    "type": "int24",
    "internalType": "int24"
   }
  ],
  "outputs": [
   {
    "name": "liquidityGross",
    "type": "uint128",
    "internalType": "uint128"
   },
   {
    "name": "liquidityNet",
    "type": "int128",
    "internalType": "int128"
   },
   {
    "name": "feeGrowthOutside0X128",
    "type": "uint256",
    "internalType": "uint256"
   },
   {
    "name": "feeGrowthOutside1X128",
    "type": "uint256",
    "internalType": "uint256"
   },
   {
    "name": "tickCumulativeOutside",
    "type": "int56",
    "internalType": "int56"
   },
   {
    "name": "secondsPerLiquidityOutsideX128",
    "type": "uint160",
    "internalType": "uint160"
   },
   {
    "name": "secondsOutside",
    "type": "uint32",
    "internalType": "uint32"
   },
   {
    "name": "initialized",
    "type": "bool",
    "internalType": "bool"
   }
  ],
  "stateMutability": "view"
 },
 {
  "name": "token0",
  "type": "function",
  "inputs": [],
  "outputs": [
   {
    "name": "",
    "type": "address",
    "internalType": "address"
   }
  ],
  "stateMutability": "view"
 },
 {
  "name": "token1",
  "type": "function",
  "inputs": [],
  "outputs": [
   {
    "name": "",
    "type": "address",
    "internalType": "address"
   }
  ],
  "stateMutability": "view"
 }
]

Creation code isn’t shown — this contract was deployed by a factory (internal CREATE), so it has no standalone creation transaction.

Deployed Bytecode

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A contract address hosts a smart contract — a set of code functions that can execute independently of any centralized server. Learn more in our Knowledge Base.

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// SPDX-License-Identifier: BUSL-1.1 pragma solidity =0.7.6; import './interfaces/IUniswapV3Pool.sol'; import './NoDelegateCall.sol'; import './libraries/LowGasSafeMath.sol'; import './libraries/SafeCast.sol'; import './libraries/Tick.sol'; import './libraries/TickBitmap.sol'; import './libraries/Position.sol'; import './libraries/Oracle.sol'; import './libraries/FullMath.sol'; import './libraries/FixedPoint128.sol'; import './libraries/TransferHelper.sol'; import './libraries/TickMath.sol'; import './libraries/LiquidityMath.sol'; import './libraries/SqrtPriceMath.sol'; import './libraries/SwapMath.sol'; import './interfaces/IUniswapV3PoolDeployer.sol'; import './interfaces/IUniswapV3Factory.sol'; import './interfaces/IERC20Minimal.sol'; import './interfaces/callback/IUniswapV3MintCallback.sol'; import './interfaces/callback/IUniswapV3SwapCallback.sol'; import './interfaces/callback/IUniswapV3FlashCallback.sol'; contract UniswapV3Pool is IUniswapV3Pool, NoDelegateCall { using LowGasSafeMath for uint256; using LowGasSafeMath for int256; using SafeCast for uint256; using SafeCast for int256; using Tick for mapping(int24 => Tick.Info); using TickBitmap for mapping(int16 => uint256); using Position for mapping(bytes32 => Position.Info); using Position for Position.Info; using Oracle for Oracle.Observation[65535]; /// @inheritdoc IUniswapV3PoolImmutables address public immutable override factory; /// @inheritdoc IUniswapV3PoolImmutables address public immutable override token0; /// @inheritdoc IUniswapV3PoolImmutables address public immutable override token1; /// @inheritdoc IUniswapV3PoolImmutables uint24 public immutable override fee; /// @inheritdoc IUniswapV3PoolImmutables int24 public immutable override tickSpacing; /// @inheritdoc IUniswapV3PoolImmutables uint128 public immutable override maxLiquidityPerTick; struct Slot0 { // the current price uint160 sqrtPriceX96; // the current tick int24 tick; // the most-recently updated index of the observations array uint16 observationIndex; // the current maximum number of observations that are being stored uint16 observationCardinality; // the next maximum number of observations to store, triggered in observations.write uint16 observationCardinalityNext; // the current protocol fee as a percentage of the swap fee taken on withdrawal // represented as an integer denominator (1/x)% uint8 feeProtocol; // whether the pool is locked bool unlocked; } /// @inheritdoc IUniswapV3PoolState Slot0 public override slot0; /// @inheritdoc IUniswapV3PoolState uint256 public override feeGrowthGlobal0X128; /// @inheritdoc IUniswapV3PoolState uint256 public override feeGrowthGlobal1X128; // accumulated protocol fees in token0/token1 units struct ProtocolFees { uint128 token0; uint128 token1; } /// @inheritdoc IUniswapV3PoolState ProtocolFees public override protocolFees; /// @inheritdoc IUniswapV3PoolState uint128 public override liquidity; /// @inheritdoc IUniswapV3PoolState mapping(int24 => Tick.Info) public override ticks; /// @inheritdoc IUniswapV3PoolState mapping(int16 => uint256) public override tickBitmap; /// @inheritdoc IUniswapV3PoolState mapping(bytes32 => Position.Info) public override positions; /// @inheritdoc IUniswapV3PoolState Oracle.Observation[65535] public override observations; /// @dev Mutually exclusive reentrancy protection into the pool to/from a method. This method also prevents entrance /// to a function before the pool is initialized. The reentrancy guard is required throughout the contract because /// we use balance checks to determine the payment status of interactions such as mint, swap and flash. modifier lock() { require(slot0.unlocked, 'LOK'); slot0.unlocked = false; _; slot0.unlocked = true; } /// @dev Prevents calling a function from anyone except the address returned by IUniswapV3Factory#owner() modifier onlyFactoryOwner() { require(msg.sender == IUniswapV3Factory(factory).owner()); _; } constructor() { int24 _tickSpacing; (factory, token0, token1, fee, _tickSpacing) = IUniswapV3PoolDeployer(msg.sender).parameters(); tickSpacing = _tickSpacing; maxLiquidityPerTick = Tick.tickSpacingToMaxLiquidityPerTick(_tickSpacing); } /// @dev Common checks for valid tick inputs. function checkTicks(int24 tickLower, int24 tickUpper) private pure { require(tickLower < tickUpper, 'TLU'); require(tickLower >= TickMath.MIN_TICK, 'TLM'); require(tickUpper <= TickMath.MAX_TICK, 'TUM'); } /// @dev Returns the block timestamp truncated to 32 bits, i.e. mod 2**32. This method is overridden in tests. function _blockTimestamp() internal view virtual returns (uint32) { return uint32(block.timestamp); // truncation is desired } /// @dev Get the pool's balance of token0 /// @dev This function is gas optimized to avoid a redundant extcodesize check in addition to the returndatasize /// check function balance0() private view returns (uint256) { (bool success, bytes memory data) = token0.staticcall(abi.encodeWithSelector(IERC20Minimal.balanceOf.selector, address(this))); require(success && data.length >= 32); return abi.decode(data, (uint256)); } /// @dev Get the pool's balance of token1 /// @dev This function is gas optimized to avoid a redundant extcodesize check in addition to the returndatasize /// check function balance1() private view returns (uint256) { (bool success, bytes memory data) = token1.staticcall(abi.encodeWithSelector(IERC20Minimal.balanceOf.selector, address(this))); require(success && data.length >= 32); return abi.decode(data, (uint256)); } /// @inheritdoc IUniswapV3PoolDerivedState function snapshotCumulativesInside(int24 tickLower, int24 tickUpper) external view override noDelegateCall returns ( int56 tickCumulativeInside, uint160 secondsPerLiquidityInsideX128, uint32 secondsInside ) { checkTicks(tickLower, tickUpper); int56 tickCumulativeLower; int56 tickCumulativeUpper; uint160 secondsPerLiquidityOutsideLowerX128; uint160 secondsPerLiquidityOutsideUpperX128; uint32 secondsOutsideLower; uint32 secondsOutsideUpper; { Tick.Info storage lower = ticks[tickLower]; Tick.Info storage upper = ticks[tickUpper]; bool initializedLower; (tickCumulativeLower, secondsPerLiquidityOutsideLowerX128, secondsOutsideLower, initializedLower) = ( lower.tickCumulativeOutside, lower.secondsPerLiquidityOutsideX128, lower.secondsOutside, lower.initialized ); require(initializedLower); bool initializedUpper; (tickCumulativeUpper, secondsPerLiquidityOutsideUpperX128, secondsOutsideUpper, initializedUpper) = ( upper.tickCumulativeOutside, upper.secondsPerLiquidityOutsideX128, upper.secondsOutside, upper.initialized ); require(initializedUpper); } Slot0 memory _slot0 = slot0; if (_slot0.tick < tickLower) { return ( tickCumulativeLower - tickCumulativeUpper, secondsPerLiquidityOutsideLowerX128 - secondsPerLiquidityOutsideUpperX128, secondsOutsideLower - secondsOutsideUpper ); } else if (_slot0.tick < tickUpper) { uint32 time = _blockTimestamp(); (int56 tickCumulative, uint160 secondsPerLiquidityCumulativeX128) = observations.observeSingle( time, 0, _slot0.tick, _slot0.observationIndex, liquidity, _slot0.observationCardinality ); return ( tickCumulative - tickCumulativeLower - tickCumulativeUpper, secondsPerLiquidityCumulativeX128 - secondsPerLiquidityOutsideLowerX128 - secondsPerLiquidityOutsideUpperX128, time - secondsOutsideLower - secondsOutsideUpper ); } else { return ( tickCumulativeUpper - tickCumulativeLower, secondsPerLiquidityOutsideUpperX128 - secondsPerLiquidityOutsideLowerX128, secondsOutsideUpper - secondsOutsideLower ); } } /// @inheritdoc IUniswapV3PoolDerivedState function observe(uint32[] calldata secondsAgos) external view override noDelegateCall returns (int56[] memory tickCumulatives, uint160[] memory secondsPerLiquidityCumulativeX128s) { return observations.observe( _blockTimestamp(), secondsAgos, slot0.tick, slot0.observationIndex, liquidity, slot0.observationCardinality ); } /// @inheritdoc IUniswapV3PoolActions function increaseObservationCardinalityNext(uint16 observationCardinalityNext) external override lock noDelegateCall { uint16 observationCardinalityNextOld = slot0.observationCardinalityNext; // for the event uint16 observationCardinalityNextNew = observations.grow(observationCardinalityNextOld, observationCardinalityNext); slot0.observationCardinalityNext = observationCardinalityNextNew; if (observationCardinalityNextOld != observationCardinalityNextNew) emit IncreaseObservationCardinalityNext(observationCardinalityNextOld, observationCardinalityNextNew); } /// @inheritdoc IUniswapV3PoolActions /// @dev not locked because it initializes unlocked function initialize(uint160 sqrtPriceX96) external override { require(slot0.sqrtPriceX96 == 0, 'AI'); int24 tick = TickMath.getTickAtSqrtRatio(sqrtPriceX96); (uint16 cardinality, uint16 cardinalityNext) = observations.initialize(_blockTimestamp()); slot0 = Slot0({ sqrtPriceX96: sqrtPriceX96, tick: tick, observationIndex: 0, observationCardinality: cardinality, observationCardinalityNext: cardinalityNext, feeProtocol: 0, unlocked: true }); emit Initialize(sqrtPriceX96, tick); } struct ModifyPositionParams { // the address that owns the position address owner; // the lower and upper tick of the position int24 tickLower; int24 tickUpper; // any change in liquidity int128 liquidityDelta; } /// @dev Effect some changes to a position /// @param params the position details and the change to the position's liquidity to effect /// @return position a storage pointer referencing the position with the given owner and tick range /// @return amount0 the amount of token0 owed to the pool, negative if the pool should pay the recipient /// @return amount1 the amount of token1 owed to the pool, negative if the pool should pay the recipient function _modifyPosition(ModifyPositionParams memory params) private noDelegateCall returns ( Position.Info storage position, int256 amount0, int256 amount1 ) { checkTicks(params.tickLower, params.tickUpper); Slot0 memory _slot0 = slot0; // SLOAD for gas optimization position = _updatePosition( params.owner, params.tickLower, params.tickUpper, params.liquidityDelta, _slot0.tick ); if (params.liquidityDelta != 0) { if (_slot0.tick < params.tickLower) { // current tick is below the passed range; liquidity can only become in range by crossing from left to // right, when we'll need _more_ token0 (it's becoming more valuable) so user must provide it amount0 = SqrtPriceMath.getAmount0Delta( TickMath.getSqrtRatioAtTick(params.tickLower), TickMath.getSqrtRatioAtTick(params.tickUpper), params.liquidityDelta ); } else if (_slot0.tick < params.tickUpper) { // current tick is inside the passed range uint128 liquidityBefore = liquidity; // SLOAD for gas optimization // write an oracle entry (slot0.observationIndex, slot0.observationCardinality) = observations.write( _slot0.observationIndex, _blockTimestamp(), _slot0.tick, liquidityBefore, _slot0.observationCardinality, _slot0.observationCardinalityNext ); amount0 = SqrtPriceMath.getAmount0Delta( _slot0.sqrtPriceX96, TickMath.getSqrtRatioAtTick(params.tickUpper), params.liquidityDelta ); amount1 = SqrtPriceMath.getAmount1Delta( TickMath.getSqrtRatioAtTick(params.tickLower), _slot0.sqrtPriceX96, params.liquidityDelta ); liquidity = LiquidityMath.addDelta(liquidityBefore, params.liquidityDelta); } else { // current tick is above the passed range; liquidity can only become in range by crossing from right to // left, when we'll need _more_ token1 (it's becoming more valuable) so user must provide it amount1 = SqrtPriceMath.getAmount1Delta( TickMath.getSqrtRatioAtTick(params.tickLower), TickMath.getSqrtRatioAtTick(params.tickUpper), params.liquidityDelta ); } } } /// @dev Gets and updates a position with the given liquidity delta /// @param owner the owner of the position /// @param tickLower the lower tick of the position's tick range /// @param tickUpper the upper tick of the position's tick range /// @param tick the current tick, passed to avoid sloads function _updatePosition( address owner, int24 tickLower, int24 tickUpper, int128 liquidityDelta, int24 tick ) private returns (Position.Info storage position) { position = positions.get(owner, tickLower, tickUpper); uint256 _feeGrowthGlobal0X128 = feeGrowthGlobal0X128; // SLOAD for gas optimization uint256 _feeGrowthGlobal1X128 = feeGrowthGlobal1X128; // SLOAD for gas optimization // if we need to update the ticks, do it bool flippedLower; bool flippedUpper; if (liquidityDelta != 0) { uint32 time = _blockTimestamp(); (int56 tickCumulative, uint160 secondsPerLiquidityCumulativeX128) = observations.observeSingle( time, 0, slot0.tick, slot0.observationIndex, liquidity, slot0.observationCardinality ); flippedLower = ticks.update( tickLower, tick, liquidityDelta, _feeGrowthGlobal0X128, _feeGrowthGlobal1X128, secondsPerLiquidityCumulativeX128, tickCumulative, time, false, maxLiquidityPerTick ); flippedUpper = ticks.update( tickUpper, tick, liquidityDelta, _feeGrowthGlobal0X128, _feeGrowthGlobal1X128, secondsPerLiquidityCumulativeX128, tickCumulative, time, true, maxLiquidityPerTick ); if (flippedLower) { tickBitmap.flipTick(tickLower, tickSpacing); } if (flippedUpper) { tickBitmap.flipTick(tickUpper, tickSpacing); } } (uint256 feeGrowthInside0X128, uint256 feeGrowthInside1X128) = ticks.getFeeGrowthInside(tickLower, tickUpper, tick, _feeGrowthGlobal0X128, _feeGrowthGlobal1X128); position.update(liquidityDelta, feeGrowthInside0X128, feeGrowthInside1X128); // clear any tick data that is no longer needed if (liquidityDelta < 0) { if (flippedLower) { ticks.clear(tickLower); } if (flippedUpper) { ticks.clear(tickUpper); } } } /// @inheritdoc IUniswapV3PoolActions /// @dev noDelegateCall is applied indirectly via _modifyPosition function mint( address recipient, int24 tickLower, int24 tickUpper, uint128 amount, bytes calldata data ) external override lock returns (uint256 amount0, uint256 amount1) { require(amount > 0); (, int256 amount0Int, int256 amount1Int) = _modifyPosition( ModifyPositionParams({ owner: recipient, tickLower: tickLower, tickUpper: tickUpper, liquidityDelta: int256(amount).toInt128() }) ); amount0 = uint256(amount0Int); amount1 = uint256(amount1Int); uint256 balance0Before; uint256 balance1Before; if (amount0 > 0) balance0Before = balance0(); if (amount1 > 0) balance1Before = balance1(); IUniswapV3MintCallback(msg.sender).uniswapV3MintCallback(amount0, amount1, data); if (amount0 > 0) require(balance0Before.add(amount0) <= balance0(), 'M0'); if (amount1 > 0) require(balance1Before.add(amount1) <= balance1(), 'M1'); emit Mint(msg.sender, recipient, tickLower, tickUpper, amount, amount0, amount1); } /// @inheritdoc IUniswapV3PoolActions function collect( address recipient, int24 tickLower, int24 tickUpper, uint128 amount0Requested, uint128 amount1Requested ) external override lock returns (uint128 amount0, uint128 amount1) { // we don't need to checkTicks here, because invalid positions will never have non-zero tokensOwed{0,1} Position.Info storage position = positions.get(msg.sender, tickLower, tickUpper); amount0 = amount0Requested > position.tokensOwed0 ? position.tokensOwed0 : amount0Requested; amount1 = amount1Requested > position.tokensOwed1 ? position.tokensOwed1 : amount1Requested; if (amount0 > 0) { position.tokensOwed0 -= amount0; TransferHelper.safeTransfer(token0, recipient, amount0); } if (amount1 > 0) { position.tokensOwed1 -= amount1; TransferHelper.safeTransfer(token1, recipient, amount1); } emit Collect(msg.sender, recipient, tickLower, tickUpper, amount0, amount1); } /// @inheritdoc IUniswapV3PoolActions /// @dev noDelegateCall is applied indirectly via _modifyPosition function burn( int24 tickLower, int24 tickUpper, uint128 amount ) external override lock returns (uint256 amount0, uint256 amount1) { (Position.Info storage position, int256 amount0Int, int256 amount1Int) = _modifyPosition( ModifyPositionParams({ owner: msg.sender, tickLower: tickLower, tickUpper: tickUpper, liquidityDelta: -int256(amount).toInt128() }) ); amount0 = uint256(-amount0Int); amount1 = uint256(-amount1Int); if (amount0 > 0 || amount1 > 0) { (position.tokensOwed0, position.tokensOwed1) = ( position.tokensOwed0 + uint128(amount0), position.tokensOwed1 + uint128(amount1) ); } emit Burn(msg.sender, tickLower, tickUpper, amount, amount0, amount1); } struct SwapCache { // the protocol fee for the input token uint8 feeProtocol; // liquidity at the beginning of the swap uint128 liquidityStart; // the timestamp of the current block uint32 blockTimestamp; // the current value of the tick accumulator, computed only if we cross an initialized tick int56 tickCumulative; // the current value of seconds per liquidity accumulator, computed only if we cross an initialized tick uint160 secondsPerLiquidityCumulativeX128; // whether we've computed and cached the above two accumulators bool computedLatestObservation; } // the top level state of the swap, the results of which are recorded in storage at the end struct SwapState { // the amount remaining to be swapped in/out of the input/output asset int256 amountSpecifiedRemaining; // the amount already swapped out/in of the output/input asset int256 amountCalculated; // current sqrt(price) uint160 sqrtPriceX96; // the tick associated with the current price int24 tick; // the global fee growth of the input token uint256 feeGrowthGlobalX128; // amount of input token paid as protocol fee uint128 protocolFee; // the current liquidity in range uint128 liquidity; } struct StepComputations { // the price at the beginning of the step uint160 sqrtPriceStartX96; // the next tick to swap to from the current tick in the swap direction int24 tickNext; // whether tickNext is initialized or not bool initialized; // sqrt(price) for the next tick (1/0) uint160 sqrtPriceNextX96; // how much is being swapped in in this step uint256 amountIn; // how much is being swapped out uint256 amountOut; // how much fee is being paid in uint256 feeAmount; } /// @inheritdoc IUniswapV3PoolActions function swap( address recipient, bool zeroForOne, int256 amountSpecified, uint160 sqrtPriceLimitX96, bytes calldata data ) external override noDelegateCall returns (int256 amount0, int256 amount1) { require(amountSpecified != 0, 'AS'); Slot0 memory slot0Start = slot0; require(slot0Start.unlocked, 'LOK'); require( zeroForOne ? sqrtPriceLimitX96 < slot0Start.sqrtPriceX96 && sqrtPriceLimitX96 > TickMath.MIN_SQRT_RATIO : sqrtPriceLimitX96 > slot0Start.sqrtPriceX96 && sqrtPriceLimitX96 < TickMath.MAX_SQRT_RATIO, 'SPL' ); slot0.unlocked = false; SwapCache memory cache = SwapCache({ liquidityStart: liquidity, blockTimestamp: _blockTimestamp(), feeProtocol: zeroForOne ? (slot0Start.feeProtocol % 16) : (slot0Start.feeProtocol >> 4), secondsPerLiquidityCumulativeX128: 0, tickCumulative: 0, computedLatestObservation: false }); bool exactInput = amountSpecified > 0; SwapState memory state = SwapState({ amountSpecifiedRemaining: amountSpecified, amountCalculated: 0, sqrtPriceX96: slot0Start.sqrtPriceX96, tick: slot0Start.tick, feeGrowthGlobalX128: zeroForOne ? feeGrowthGlobal0X128 : feeGrowthGlobal1X128, protocolFee: 0, liquidity: cache.liquidityStart }); // continue swapping as long as we haven't used the entire input/output and haven't reached the price limit while (state.amountSpecifiedRemaining != 0 && state.sqrtPriceX96 != sqrtPriceLimitX96) { StepComputations memory step; step.sqrtPriceStartX96 = state.sqrtPriceX96; (step.tickNext, step.initialized) = tickBitmap.nextInitializedTickWithinOneWord( state.tick, tickSpacing, zeroForOne ); // ensure that we do not overshoot the min/max tick, as the tick bitmap is not aware of these bounds if (step.tickNext < TickMath.MIN_TICK) { step.tickNext = TickMath.MIN_TICK; } else if (step.tickNext > TickMath.MAX_TICK) { step.tickNext = TickMath.MAX_TICK; } // get the price for the next tick step.sqrtPriceNextX96 = TickMath.getSqrtRatioAtTick(step.tickNext); // compute values to swap to the target tick, price limit, or point where input/output amount is exhausted (state.sqrtPriceX96, step.amountIn, step.amountOut, step.feeAmount) = SwapMath.computeSwapStep( state.sqrtPriceX96, (zeroForOne ? step.sqrtPriceNextX96 < sqrtPriceLimitX96 : step.sqrtPriceNextX96 > sqrtPriceLimitX96) ? sqrtPriceLimitX96 : step.sqrtPriceNextX96, state.liquidity, state.amountSpecifiedRemaining, fee ); if (exactInput) { state.amountSpecifiedRemaining -= (step.amountIn + step.feeAmount).toInt256(); state.amountCalculated = state.amountCalculated.sub(step.amountOut.toInt256()); } else { state.amountSpecifiedRemaining += step.amountOut.toInt256(); state.amountCalculated = state.amountCalculated.add((step.amountIn + step.feeAmount).toInt256()); } // if the protocol fee is on, calculate how much is owed, decrement feeAmount, and increment protocolFee if (cache.feeProtocol > 0) { uint256 delta = step.feeAmount / cache.feeProtocol; step.feeAmount -= delta; state.protocolFee += uint128(delta); } // update global fee tracker if (state.liquidity > 0) state.feeGrowthGlobalX128 += FullMath.mulDiv(step.feeAmount, FixedPoint128.Q128, state.liquidity); // shift tick if we reached the next price if (state.sqrtPriceX96 == step.sqrtPriceNextX96) { // if the tick is initialized, run the tick transition if (step.initialized) { // check for the placeholder value, which we replace with the actual value the first time the swap // crosses an initialized tick if (!cache.computedLatestObservation) { (cache.tickCumulative, cache.secondsPerLiquidityCumulativeX128) = observations.observeSingle( cache.blockTimestamp, 0, slot0Start.tick, slot0Start.observationIndex, cache.liquidityStart, slot0Start.observationCardinality ); cache.computedLatestObservation = true; } int128 liquidityNet = ticks.cross( step.tickNext, (zeroForOne ? state.feeGrowthGlobalX128 : feeGrowthGlobal0X128), (zeroForOne ? feeGrowthGlobal1X128 : state.feeGrowthGlobalX128), cache.secondsPerLiquidityCumulativeX128, cache.tickCumulative, cache.blockTimestamp ); // if we're moving leftward, we interpret liquidityNet as the opposite sign // safe because liquidityNet cannot be type(int128).min if (zeroForOne) liquidityNet = -liquidityNet; state.liquidity = LiquidityMath.addDelta(state.liquidity, liquidityNet); } state.tick = zeroForOne ? step.tickNext - 1 : step.tickNext; } else if (state.sqrtPriceX96 != step.sqrtPriceStartX96) { // recompute unless we're on a lower tick boundary (i.e. already transitioned ticks), and haven't moved state.tick = TickMath.getTickAtSqrtRatio(state.sqrtPriceX96); } } // update tick and write an oracle entry if the tick change if (state.tick != slot0Start.tick) { (uint16 observationIndex, uint16 observationCardinality) = observations.write( slot0Start.observationIndex, cache.blockTimestamp, slot0Start.tick, cache.liquidityStart, slot0Start.observationCardinality, slot0Start.observationCardinalityNext ); (slot0.sqrtPriceX96, slot0.tick, slot0.observationIndex, slot0.observationCardinality) = ( state.sqrtPriceX96, state.tick, observationIndex, observationCardinality ); } else { // otherwise just update the price slot0.sqrtPriceX96 = state.sqrtPriceX96; } // update liquidity if it changed if (cache.liquidityStart != state.liquidity) liquidity = state.liquidity; // update fee growth global and, if necessary, protocol fees // overflow is acceptable, protocol has to withdraw before it hits type(uint128).max fees if (zeroForOne) { feeGrowthGlobal0X128 = state.feeGrowthGlobalX128; if (state.protocolFee > 0) protocolFees.token0 += state.protocolFee; } else { feeGrowthGlobal1X128 = state.feeGrowthGlobalX128; if (state.protocolFee > 0) protocolFees.token1 += state.protocolFee; } (amount0, amount1) = zeroForOne == exactInput ? (amountSpecified - state.amountSpecifiedRemaining, state.amountCalculated) : (state.amountCalculated, amountSpecified - state.amountSpecifiedRemaining); // do the transfers and collect payment if (zeroForOne) { if (amount1 < 0) TransferHelper.safeTransfer(token1, recipient, uint256(-amount1)); uint256 balance0Before = balance0(); IUniswapV3SwapCallback(msg.sender).uniswapV3SwapCallback(amount0, amount1, data); require(balance0Before.add(uint256(amount0)) <= balance0(), 'IIA'); } else { if (amount0 < 0) TransferHelper.safeTransfer(token0, recipient, uint256(-amount0)); uint256 balance1Before = balance1(); IUniswapV3SwapCallback(msg.sender).uniswapV3SwapCallback(amount0, amount1, data); require(balance1Before.add(uint256(amount1)) <= balance1(), 'IIA'); } emit Swap(msg.sender, recipient, amount0, amount1, state.sqrtPriceX96, state.liquidity, state.tick); slot0.unlocked = true; } /// @inheritdoc IUniswapV3PoolActions function flash( address recipient, uint256 amount0, uint256 amount1, bytes calldata data ) external override lock noDelegateCall { uint128 _liquidity = liquidity; require(_liquidity > 0, 'L'); uint256 fee0 = FullMath.mulDivRoundingUp(amount0, fee, 1e6); uint256 fee1 = FullMath.mulDivRoundingUp(amount1, fee, 1e6); uint256 balance0Before = balance0(); uint256 balance1Before = balance1(); if (amount0 > 0) TransferHelper.safeTransfer(token0, recipient, amount0); if (amount1 > 0) TransferHelper.safeTransfer(token1, recipient, amount1); IUniswapV3FlashCallback(msg.sender).uniswapV3FlashCallback(fee0, fee1, data); uint256 balance0After = balance0(); uint256 balance1After = balance1(); require(balance0Before.add(fee0) <= balance0After, 'F0'); require(balance1Before.add(fee1) <= balance1After, 'F1'); // sub is safe because we know balanceAfter is gt balanceBefore by at least fee uint256 paid0 = balance0After - balance0Before; uint256 paid1 = balance1After - balance1Before; if (paid0 > 0) { uint8 feeProtocol0 = slot0.feeProtocol % 16; uint256 fees0 = feeProtocol0 == 0 ? 0 : paid0 / feeProtocol0; if (uint128(fees0) > 0) protocolFees.token0 += uint128(fees0); feeGrowthGlobal0X128 += FullMath.mulDiv(paid0 - fees0, FixedPoint128.Q128, _liquidity); } if (paid1 > 0) { uint8 feeProtocol1 = slot0.feeProtocol >> 4; uint256 fees1 = feeProtocol1 == 0 ? 0 : paid1 / feeProtocol1; if (uint128(fees1) > 0) protocolFees.token1 += uint128(fees1); feeGrowthGlobal1X128 += FullMath.mulDiv(paid1 - fees1, FixedPoint128.Q128, _liquidity); } emit Flash(msg.sender, recipient, amount0, amount1, paid0, paid1); } /// @inheritdoc IUniswapV3PoolOwnerActions function setFeeProtocol(uint8 feeProtocol0, uint8 feeProtocol1) external override lock onlyFactoryOwner { require( (feeProtocol0 == 0 || (feeProtocol0 >= 4 && feeProtocol0 <= 10)) && (feeProtocol1 == 0 || (feeProtocol1 >= 4 && feeProtocol1 <= 10)) ); uint8 feeProtocolOld = slot0.feeProtocol; slot0.feeProtocol = feeProtocol0 + (feeProtocol1 << 4); emit SetFeeProtocol(feeProtocolOld % 16, feeProtocolOld >> 4, feeProtocol0, feeProtocol1); } /// @inheritdoc IUniswapV3PoolOwnerActions function collectProtocol( address recipient, uint128 amount0Requested, uint128 amount1Requested ) external override lock onlyFactoryOwner returns (uint128 amount0, uint128 amount1) { amount0 = amount0Requested > protocolFees.token0 ? protocolFees.token0 : amount0Requested; amount1 = amount1Requested > protocolFees.token1 ? protocolFees.token1 : amount1Requested; if (amount0 > 0) { if (amount0 == protocolFees.token0) amount0--; // ensure that the slot is not cleared, for gas savings protocolFees.token0 -= amount0; TransferHelper.safeTransfer(token0, recipient, amount0); } if (amount1 > 0) { if (amount1 == protocolFees.token1) amount1--; // ensure that the slot is not cleared, for gas savings protocolFees.token1 -= amount1; TransferHelper.safeTransfer(token1, recipient, amount1); } emit CollectProtocol(msg.sender, recipient, amount0, amount1); } }

[ { "type": "constructor", "inputs": [], "stateMutability": "nonpayable" }, { "name": "Burn", "type": "event", "inputs": [ { "name": "owner", "type": "address", "indexed": true, "internalType": "address" }, { "name": "tickLower", "type": "int24", "indexed": true, "internalType": "int24" }, { "name": "tickUpper", "type": "int24", "indexed": true, "internalType": "int24" }, { "name": "amount", "type": "uint128", "indexed": false, "internalType": "uint128" }, { "name": "amount0", "type": "uint256", "indexed": false, "internalType": "uint256" }, { "name": "amount1", "type": "uint256", "indexed": false, "internalType": "uint256" } ], "anonymous": false }, { "name": "Collect", "type": "event", "inputs": [ { "name": "owner", "type": "address", "indexed": true, "internalType": "address" }, { "name": "recipient", "type": "address", "indexed": false, "internalType": "address" }, { "name": "tickLower", "type": "int24", "indexed": true, "internalType": "int24" }, { "name": "tickUpper", "type": "int24", "indexed": true, "internalType": "int24" }, { "name": "amount0", "type": "uint128", "indexed": false, "internalType": "uint128" }, { "name": "amount1", "type": "uint128", "indexed": false, "internalType": "uint128" } ], "anonymous": false }, { "name": "CollectProtocol", "type": "event", "inputs": [ { "name": "sender", "type": "address", "indexed": true, "internalType": "address" }, { "name": "recipient", "type": "address", "indexed": true, "internalType": "address" }, { "name": "amount0", "type": "uint128", "indexed": false, "internalType": "uint128" }, { "name": "amount1", "type": "uint128", "indexed": false, "internalType": "uint128" } ], "anonymous": false }, { "name": "Flash", "type": "event", "inputs": [ { "name": "sender", "type": "address", "indexed": true, "internalType": "address" }, { "name": "recipient", "type": "address", "indexed": true, "internalType": "address" }, { "name": "amount0", "type": "uint256", "indexed": false, "internalType": "uint256" }, { "name": "amount1", "type": "uint256", "indexed": false, "internalType": "uint256" }, { "name": "paid0", "type": "uint256", "indexed": false, "internalType": "uint256" }, { "name": "paid1", "type": "uint256", "indexed": false, "internalType": "uint256" } ], "anonymous": false }, { "name": "IncreaseObservationCardinalityNext", "type": "event", "inputs": [ { "name": "observationCardinalityNextOld", "type": "uint16", "indexed": false, "internalType": "uint16" }, { "name": "observationCardinalityNextNew", "type": "uint16", "indexed": false, "internalType": "uint16" } ], "anonymous": false }, { "name": "Initialize", "type": "event", "inputs": [ { "name": "sqrtPriceX96", "type": "uint160", "indexed": false, "internalType": "uint160" }, { "name": "tick", "type": "int24", "indexed": false, "internalType": "int24" } ], "anonymous": false }, { "name": "Mint", "type": "event", "inputs": [ { "name": "sender", "type": "address", "indexed": false, "internalType": "address" }, { "name": "owner", "type": "address", "indexed": true, "internalType": "address" }, { "name": "tickLower", "type": "int24", "indexed": true, "internalType": "int24" }, { "name": "tickUpper", "type": "int24", "indexed": true, "internalType": "int24" }, { "name": "amount", "type": "uint128", "indexed": false, "internalType": "uint128" }, { "name": "amount0", "type": "uint256", "indexed": false, "internalType": "uint256" }, { "name": "amount1", "type": "uint256", "indexed": false, "internalType": "uint256" } ], "anonymous": false }, { "name": "SetFeeProtocol", "type": "event", "inputs": [ { "name": "feeProtocol0Old", "type": "uint8", "indexed": false, "internalType": "uint8" }, { "name": "feeProtocol1Old", "type": "uint8", "indexed": false, "internalType": "uint8" }, { "name": "feeProtocol0New", "type": "uint8", "indexed": false, "internalType": "uint8" }, { "name": "feeProtocol1New", "type": "uint8", "indexed": false, "internalType": "uint8" } ], "anonymous": false }, { "name": "Swap", "type": "event", "inputs": [ { "name": "sender", "type": "address", "indexed": true, "internalType": "address" }, { "name": "recipient", "type": "address", "indexed": true, "internalType": "address" }, { "name": "amount0", "type": "int256", "indexed": false, "internalType": "int256" }, { "name": "amount1", "type": "int256", "indexed": false, "internalType": "int256" }, { "name": "sqrtPriceX96", "type": "uint160", "indexed": false, "internalType": "uint160" }, { "name": "liquidity", "type": "uint128", "indexed": false, "internalType": "uint128" }, { "name": "tick", "type": "int24", "indexed": false, "internalType": "int24" } ], "anonymous": false }, { "name": "burn", "type": "function", "inputs": [ { "name": "tickLower", "type": "int24", "internalType": "int24" }, { "name": "tickUpper", "type": "int24", "internalType": "int24" }, { "name": "amount", "type": "uint128", "internalType": "uint128" } ], "outputs": [ { "name": "amount0", "type": "uint256", "internalType": "uint256" }, { "name": "amount1", "type": "uint256", "internalType": "uint256" } ], "stateMutability": "nonpayable" }, { "name": "collect", "type": "function", "inputs": [ { "name": "recipient", "type": "address", "internalType": "address" }, { "name": "tickLower", "type": "int24", "internalType": "int24" }, { "name": "tickUpper", "type": "int24", "internalType": "int24" }, { "name": "amount0Requested", "type": "uint128", "internalType": "uint128" }, { "name": "amount1Requested", "type": "uint128", "internalType": "uint128" } ], "outputs": [ { "name": "amount0", "type": "uint128", "internalType": "uint128" }, { "name": "amount1", "type": "uint128", "internalType": "uint128" } ], "stateMutability": "nonpayable" }, { "name": "collectProtocol", "type": "function", "inputs": [ { "name": "recipient", "type": "address", "internalType": "address" }, { "name": "amount0Requested", "type": "uint128", "internalType": "uint128" }, { "name": "amount1Requested", "type": "uint128", "internalType": "uint128" } ], "outputs": [ { "name": "amount0", "type": "uint128", "internalType": "uint128" }, { "name": "amount1", "type": "uint128", "internalType": "uint128" } ], "stateMutability": "nonpayable" }, { "name": "factory", "type": "function", "inputs": [], "outputs": [ { "name": "", "type": "address", "internalType": "address" } ], "stateMutability": "view" }, { "name": "fee", "type": "function", "inputs": [], "outputs": [ { "name": "", "type": "uint24", "internalType": "uint24" } ], "stateMutability": "view" }, { "name": "feeGrowthGlobal0X128", "type": "function", "inputs": [], "outputs": [ { "name": "", "type": "uint256", "internalType": "uint256" } ], "stateMutability": "view" }, { "name": "feeGrowthGlobal1X128", "type": "function", "inputs": [], "outputs": [ { "name": "", "type": "uint256", "internalType": "uint256" } ], "stateMutability": "view" }, { "name": "flash", "type": "function", "inputs": [ { "name": "recipient", "type": "address", "internalType": "address" }, { "name": "amount0", "type": "uint256", "internalType": "uint256" }, { "name": "amount1", "type": "uint256", "internalType": "uint256" }, { "name": "data", "type": "bytes", "internalType": "bytes" } ], "outputs": [], "stateMutability": "nonpayable" }, { "name": "increaseObservationCardinalityNext", "type": "function", "inputs": [ { "name": "observationCardinalityNext", "type": "uint16", "internalType": "uint16" } ], "outputs": [], "stateMutability": "nonpayable" }, { "name": "initialize", "type": "function", "inputs": [ { "name": "sqrtPriceX96", "type": "uint160", "internalType": "uint160" } ], "outputs": [], "stateMutability": "nonpayable" }, { "name": "liquidity", "type": "function", "inputs": [], "outputs": [ { "name": "", "type": "uint128", "internalType": "uint128" } ], "stateMutability": "view" }, { "name": "maxLiquidityPerTick", "type": "function", "inputs": [], "outputs": [ { "name": "", "type": "uint128", "internalType": "uint128" } ], "stateMutability": "view" }, { "name": "mint", "type": "function", "inputs": [ { "name": "recipient", "type": "address", "internalType": "address" }, { "name": "tickLower", "type": "int24", "internalType": "int24" }, { "name": "tickUpper", "type": "int24", "internalType": "int24" }, { "name": "amount", "type": "uint128", "internalType": "uint128" }, { "name": "data", "type": "bytes", "internalType": "bytes" } ], "outputs": [ { "name": "amount0", "type": "uint256", "internalType": "uint256" }, { "name": "amount1", "type": "uint256", "internalType": "uint256" } ], "stateMutability": "nonpayable" }, { "name": "observations", "type": "function", "inputs": [ { "name": "", "type": "uint256", "internalType": "uint256" } ], "outputs": [ { "name": "blockTimestamp", "type": "uint32", "internalType": "uint32" }, { "name": "tickCumulative", "type": "int56", "internalType": "int56" }, { "name": "secondsPerLiquidityCumulativeX128", "type": "uint160", "internalType": "uint160" }, { "name": "initialized", "type": "bool", "internalType": "bool" } ], "stateMutability": "view" }, { "name": "observe", "type": "function", "inputs": [ { "name": "secondsAgos", "type": "uint32[]", "internalType": "uint32[]" } ], "outputs": [ { "name": "tickCumulatives", "type": "int56[]", "internalType": "int56[]" }, { "name": "secondsPerLiquidityCumulativeX128s", "type": "uint160[]", "internalType": "uint160[]" } ], "stateMutability": "view" }, { "name": "positions", "type": "function", "inputs": [ { "name": "", "type": "bytes32", "internalType": "bytes32" } ], "outputs": [ { "name": "liquidity", "type": "uint128", "internalType": "uint128" }, { "name": "feeGrowthInside0LastX128", "type": "uint256", "internalType": "uint256" }, { "name": "feeGrowthInside1LastX128", "type": "uint256", "internalType": "uint256" }, { "name": "tokensOwed0", "type": "uint128", "internalType": "uint128" }, { "name": "tokensOwed1", "type": "uint128", "internalType": "uint128" } ], "stateMutability": "view" }, { "name": "protocolFees", "type": "function", "inputs": [], "outputs": [ { "name": "token0", "type": "uint128", "internalType": "uint128" }, { "name": "token1", "type": "uint128", "internalType": "uint128" } ], "stateMutability": "view" }, { "name": "setFeeProtocol", "type": "function", "inputs": [ { "name": "feeProtocol0", "type": "uint8", "internalType": "uint8" }, { "name": "feeProtocol1", "type": "uint8", "internalType": "uint8" } ], "outputs": [], "stateMutability": "nonpayable" }, { "name": "slot0", "type": "function", "inputs": [], "outputs": [ { "name": "sqrtPriceX96", "type": "uint160", "internalType": "uint160" }, { "name": "tick", "type": "int24", "internalType": "int24" }, { "name": "observationIndex", "type": "uint16", "internalType": "uint16" }, { "name": "observationCardinality", "type": "uint16", "internalType": "uint16" }, { "name": "observationCardinalityNext", "type": "uint16", "internalType": "uint16" }, { "name": "feeProtocol", "type": "uint8", "internalType": "uint8" }, { "name": "unlocked", "type": "bool", "internalType": "bool" } ], "stateMutability": "view" }, { "name": "snapshotCumulativesInside", "type": "function", "inputs": [ { "name": "tickLower", "type": "int24", "internalType": "int24" }, { "name": "tickUpper", "type": "int24", "internalType": "int24" } ], "outputs": [ { "name": "tickCumulativeInside", "type": "int56", "internalType": "int56" }, { "name": "secondsPerLiquidityInsideX128", "type": "uint160", "internalType": "uint160" }, { "name": "secondsInside", "type": "uint32", "internalType": "uint32" } ], "stateMutability": "view" }, { "name": "swap", "type": "function", "inputs": [ { "name": "recipient", "type": "address", "internalType": "address" }, { "name": "zeroForOne", "type": "bool", "internalType": "bool" }, { "name": "amountSpecified", "type": "int256", "internalType": "int256" }, { "name": "sqrtPriceLimitX96", "type": "uint160", "internalType": "uint160" }, { "name": "data", "type": "bytes", "internalType": "bytes" } ], "outputs": [ { "name": "amount0", "type": "int256", "internalType": "int256" }, { "name": "amount1", "type": "int256", "internalType": "int256" } ], "stateMutability": "nonpayable" }, { "name": "tickBitmap", "type": "function", "inputs": [ { "name": "", "type": "int16", "internalType": "int16" } ], "outputs": [ { "name": "", "type": "uint256", "internalType": "uint256" } ], "stateMutability": "view" }, { "name": "tickSpacing", "type": "function", "inputs": [], "outputs": [ { "name": "", "type": "int24", "internalType": "int24" } ], "stateMutability": "view" }, { "name": "ticks", "type": "function", "inputs": [ { "name": "", "type": "int24", "internalType": "int24" } ], "outputs": [ { "name": "liquidityGross", "type": "uint128", "internalType": "uint128" }, { "name": "liquidityNet", "type": "int128", "internalType": "int128" }, { "name": "feeGrowthOutside0X128", "type": "uint256", "internalType": "uint256" }, { "name": "feeGrowthOutside1X128", "type": "uint256", "internalType": "uint256" }, { "name": "tickCumulativeOutside", "type": "int56", "internalType": "int56" }, { "name": "secondsPerLiquidityOutsideX128", "type": "uint160", "internalType": "uint160" }, { "name": "secondsOutside", "type": "uint32", "internalType": "uint32" }, { "name": "initialized", "type": "bool", "internalType": "bool" } ], "stateMutability": "view" }, { "name": "token0", "type": "function", "inputs": [], "outputs": [ { "name": "", "type": "address", "internalType": "address" } ], "stateMutability": "view" }, { "name": "token1", "type": "function", "inputs": [], "outputs": [ { "name": "", "type": "address", "internalType": "address" } ], "stateMutability": "view" } ]

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