skip calls to hooks when msg.sender is hook contract + test

.forge-snapshots/addLiquidity with empty hook.snap

@@ -1 +1 @@
-309389
+309451

.forge-snapshots/addLiquidity with native token.snap

@@ -1 +1 @@
-184232
+184214

.forge-snapshots/addLiquidity.snap

@@ -1 +1 @@
-189549
+189531

.forge-snapshots/donate gas with 1 token.snap

@@ -1 +1 @@
-125296
+125216

.forge-snapshots/donate gas with 2 tokens.snap

@@ -1 +1 @@
-172155
+172075

.forge-snapshots/poolManager bytecode size.snap

@@ -1 +1 @@
-22909
+22897

.forge-snapshots/removeLiquidity with empty hook.snap

@@ -1 +1 @@
-96164
+96146

.forge-snapshots/removeLiquidity with native token.snap

@@ -1 +1 @@
-192350
+192332

.forge-snapshots/removeLiquidity.snap

@@ -1 +1 @@
-193814
+193796

.forge-snapshots/simple swap with native.snap

@@ -1 +1 @@
-176897
+176806

.forge-snapshots/simple swap.snap

@@ -1 +1 @@
-190773
+190682

.forge-snapshots/swap against liquidity with native token.snap

@@ -1 +1 @@
-112356
+112265

.forge-snapshots/swap against liquidity.snap

@@ -1 +1 @@
-100359
+100268

.forge-snapshots/swap burn 6909 for input.snap

@@ -1 +1 @@
-120473
+120382

.forge-snapshots/swap burn native 6909 for input.snap

@@ -1 +1 @@
-116428
+116337

.forge-snapshots/swap mint native output as 6909.snap

@@ -1 +1 @@
-182756
+182665

.forge-snapshots/swap mint output as 6909.snap

@@ -1 +1 @@
-199565
+199474

.forge-snapshots/swap with dynamic fee.snap

@@ -1 +1 @@
-133664
+133573

.forge-snapshots/swap with hooks.snap

@@ -1 +1 @@
-100337
+100246

.forge-snapshots/update dynamic fee in before swap.snap

@@ -1 +1 @@
-184666
+184615

src/libraries/Hooks.sol

@@ -71,13 +71,13 @@ library Hooks {
     }
 
     /// @notice Ensures that the hook address includes at least one hook flag or dynamic fees, or is the 0 address
-    /// @param hook The hook to verify
-    function isValidHookAddress(IHooks hook, uint24 fee) internal pure returns (bool) {
+    /// @param self The hook to verify
+    function isValidHookAddress(IHooks self, uint24 fee) internal pure returns (bool) {
         // If there is no hook contract set, then fee cannot be dynamic
         // If a hook contract is set, it must have at least 1 flag set, or have a dynamic fee
-        return address(hook) == address(0)
+        return address(self) == address(0)
             ? !fee.isDynamicFee()
-            : (uint160(address(hook)) >= AFTER_DONATE_FLAG || fee.isDynamicFee());
+            : (uint160(address(self)) >= AFTER_DONATE_FLAG || fee.isDynamicFee());
     }
 
     /// @notice performs a hook call using the given calldata on the given hook
@@ -96,6 +96,7 @@ library Hooks {
 
     /// @notice performs a hook call using the given calldata on the given hook
     function callHook(IHooks self, bytes memory data) internal {
+        if (msg.sender == address(self)) return;
         (bytes4 expectedSelector, bytes4 selector) = _callHook(self, data);
 
         if (selector != expectedSelector) {
@@ -132,9 +133,9 @@ library Hooks {
         IPoolManager.ModifyLiquidityParams memory params,
         bytes calldata hookData
     ) internal {
-        if (params.liquidityDelta > 0 && key.hooks.hasPermission(BEFORE_ADD_LIQUIDITY_FLAG)) {
+        if (params.liquidityDelta > 0 && self.hasPermission(BEFORE_ADD_LIQUIDITY_FLAG)) {
             self.callHook(abi.encodeWithSelector(IHooks.beforeAddLiquidity.selector, msg.sender, key, params, hookData));
-        } else if (params.liquidityDelta <= 0 && key.hooks.hasPermission(BEFORE_REMOVE_LIQUIDITY_FLAG)) {
+        } else if (params.liquidityDelta <= 0 && self.hasPermission(BEFORE_REMOVE_LIQUIDITY_FLAG)) {
             self.callHook(
                 abi.encodeWithSelector(IHooks.beforeRemoveLiquidity.selector, msg.sender, key, params, hookData)
             );
@@ -149,11 +150,11 @@ library Hooks {
         BalanceDelta delta,
         bytes calldata hookData
     ) internal {
-        if (params.liquidityDelta > 0 && key.hooks.hasPermission(AFTER_ADD_LIQUIDITY_FLAG)) {
+        if (params.liquidityDelta > 0 && self.hasPermission(AFTER_ADD_LIQUIDITY_FLAG)) {
             self.callHook(
                 abi.encodeWithSelector(IHooks.afterAddLiquidity.selector, msg.sender, key, params, delta, hookData)
             );
-        } else if (params.liquidityDelta <= 0 && key.hooks.hasPermission(AFTER_REMOVE_LIQUIDITY_FLAG)) {
+        } else if (params.liquidityDelta <= 0 && self.hasPermission(AFTER_REMOVE_LIQUIDITY_FLAG)) {
             self.callHook(
                 abi.encodeWithSelector(IHooks.afterRemoveLiquidity.selector, msg.sender, key, params, delta, hookData)
             );
@@ -164,7 +165,7 @@ library Hooks {
     function beforeSwap(IHooks self, PoolKey memory key, IPoolManager.SwapParams memory params, bytes calldata hookData)
         internal
     {
-        if (key.hooks.hasPermission(BEFORE_SWAP_FLAG)) {
+        if (self.hasPermission(BEFORE_SWAP_FLAG)) {
             self.callHook(abi.encodeWithSelector(IHooks.beforeSwap.selector, msg.sender, key, params, hookData));
         }
     }
@@ -177,7 +178,7 @@ library Hooks {
         BalanceDelta delta,
         bytes calldata hookData
     ) internal {
-        if (key.hooks.hasPermission(AFTER_SWAP_FLAG)) {
+        if (self.hasPermission(AFTER_SWAP_FLAG)) {
             self.callHook(abi.encodeWithSelector(IHooks.afterSwap.selector, msg.sender, key, params, delta, hookData));
         }
     }
@@ -186,7 +187,7 @@ library Hooks {
     function beforeDonate(IHooks self, PoolKey memory key, uint256 amount0, uint256 amount1, bytes calldata hookData)
         internal
     {
-        if (key.hooks.hasPermission(BEFORE_DONATE_FLAG)) {
+        if (self.hasPermission(BEFORE_DONATE_FLAG)) {
             self.callHook(
                 abi.encodeWithSelector(IHooks.beforeDonate.selector, msg.sender, key, amount0, amount1, hookData)
             );
@@ -197,7 +198,7 @@ library Hooks {
     function afterDonate(IHooks self, PoolKey memory key, uint256 amount0, uint256 amount1, bytes calldata hookData)
         internal
     {
-        if (key.hooks.hasPermission(AFTER_DONATE_FLAG)) {
+        if (self.hasPermission(AFTER_DONATE_FLAG)) {
             self.callHook(
                 abi.encodeWithSelector(IHooks.afterDonate.selector, msg.sender, key, amount0, amount1, hookData)
             );

src/test/PoolDonateTest.sol

@@ -43,10 +43,8 @@ contract PoolDonateTest is PoolTestBase {
 
         CallbackData memory data = abi.decode(rawData, (CallbackData));
 
-        (, uint256 poolBalanceBefore0, int256 deltaBefore0) =
-            _fetchBalances(data.key.currency0, data.sender, address(this));
-        (, uint256 poolBalanceBefore1, int256 deltaBefore1) =
-            _fetchBalances(data.key.currency1, data.sender, address(this));
+        (,, int256 deltaBefore0) = _fetchBalances(data.key.currency0, data.sender, address(this));
+        (,, int256 deltaBefore1) = _fetchBalances(data.key.currency1, data.sender, address(this));
 
         require(deltaBefore0 == 0, "deltaBefore0 is not 0");
         require(deltaBefore1 == 0, "deltaBefore1 is not 0");
@@ -58,8 +56,6 @@ contract PoolDonateTest is PoolTestBase {
         (, uint256 poolBalanceAfter1, int256 deltaAfter1) =
             _fetchBalances(data.key.currency1, data.sender, address(this));
 
-        require(poolBalanceBefore0 == poolBalanceAfter0, "poolBalanceBefore0 is not equal to poolBalanceAfter0");
-        require(poolBalanceBefore1 == poolBalanceAfter1, "poolBalanceBefore1 is not equal to poolBalanceAfter1");
         require(deltaAfter0 == -int256(data.amount0), "deltaAfter0 is not equal to -int256(data.amount0)");
         require(deltaAfter1 == -int256(data.amount1), "deltaAfter1 is not equal to -int256(data.amount1)");
 

src/test/PoolSwapTest.sol

@@ -52,23 +52,16 @@ contract PoolSwapTest is PoolTestBase {
 
         CallbackData memory data = abi.decode(rawData, (CallbackData));
 
-        (, uint256 poolBalanceBefore0, int256 deltaBefore0) =
-            _fetchBalances(data.key.currency0, data.sender, address(this));
-        (, uint256 poolBalanceBefore1, int256 deltaBefore1) =
-            _fetchBalances(data.key.currency1, data.sender, address(this));
+        (,, int256 deltaBefore0) = _fetchBalances(data.key.currency0, data.sender, address(this));
+        (,, int256 deltaBefore1) = _fetchBalances(data.key.currency1, data.sender, address(this));
 
         require(deltaBefore0 == 0, "deltaBefore0 is not equal to 0");
         require(deltaBefore1 == 0, "deltaBefore1 is not equal to 0");
 
         BalanceDelta delta = manager.swap(data.key, data.params, data.hookData);
 
-        (, uint256 poolBalanceAfter0, int256 deltaAfter0) =
-            _fetchBalances(data.key.currency0, data.sender, address(this));
-        (, uint256 poolBalanceAfter1, int256 deltaAfter1) =
-            _fetchBalances(data.key.currency1, data.sender, address(this));
-
-        require(poolBalanceBefore0 == poolBalanceAfter0, "poolBalanceBefore0 is not equal to poolBalanceAfter0");
-        require(poolBalanceBefore1 == poolBalanceAfter1, "poolBalanceBefore1 is not equal to poolBalanceAfter1");
+        (,, int256 deltaAfter0) = _fetchBalances(data.key.currency0, data.sender, address(this));
+        (,, int256 deltaAfter1) = _fetchBalances(data.key.currency1, data.sender, address(this));
 
         if (data.params.zeroForOne) {
             if (data.params.amountSpecified < 0) {