Add nonReentrant modifiers on functions that use getCurrentContextAddress only, add lockMutex modifier on functions that make external calls

packages/contracts/src/2.0.0/protocol/Exchange/MixinExchangeCore.sol

@@ -56,6 +56,7 @@ contract MixinExchangeCore is
     /// @param targetOrderEpoch Orders created with a salt less or equal to this value will be cancelled.
     function cancelOrdersUpTo(uint256 targetOrderEpoch)
         external
+        nonReentrant
     {
         address makerAddress = getCurrentContextAddress();
         // If this function is called via `executeTransaction`, we only update the orderEpoch for the makerAddress/msg.sender combination.
@@ -88,7 +89,7 @@ contract MixinExchangeCore is
         bytes memory signature
     )
         public
-        nonReentrant
+        lockMutex
         returns (FillResults memory fillResults)
     {
         fillResults = fillOrderInternal(
@@ -104,6 +105,7 @@ contract MixinExchangeCore is
     /// @param order Order to cancel. Order must be OrderStatus.FILLABLE.
     function cancelOrder(Order memory order)
         public
+        nonReentrant
     {
         // Fetch current order status
         OrderInfo memory orderInfo = getOrderInfo(order);

packages/contracts/src/2.0.0/protocol/Exchange/MixinMatchOrders.sol

@@ -50,7 +50,7 @@ contract MixinMatchOrders is
         bytes memory rightSignature
     )
         public
-        nonReentrant
+        lockMutex
         returns (LibFillResults.MatchedFillResults memory matchedFillResults)
     {
         // We assume that rightOrder.takerAssetData == leftOrder.makerAssetData and rightOrder.makerAssetData == leftOrder.takerAssetData.

packages/contracts/src/2.0.0/protocol/Exchange/MixinSignatureValidator.sol

@@ -19,6 +19,7 @@
 pragma solidity 0.4.24;
 
 import "../../utils/LibBytes/LibBytes.sol";
+import "../../utils/ReentrancyGuard/ReentrancyGuard.sol";
 import "./mixins/MSignatureValidator.sol";
 import "./mixins/MTransactions.sol";
 import "./interfaces/IWallet.sol";
@@ -26,6 +27,7 @@ import "./interfaces/IValidator.sol";
 
 
 contract MixinSignatureValidator is
+    ReentrancyGuard,
     MSignatureValidator,
     MTransactions
 {
@@ -69,6 +71,7 @@ contract MixinSignatureValidator is
         bool approval
     )
         external
+        nonReentrant
     {
         address signerAddress = getCurrentContextAddress();
         allowedValidators[signerAddress][validatorAddress] = approval;

packages/contracts/src/2.0.0/protocol/Exchange/MixinWrapperFunctions.sol

@@ -46,7 +46,7 @@ contract MixinWrapperFunctions is
         bytes memory signature
     )
         public
-        nonReentrant
+        lockMutex
         returns (FillResults memory fillResults)
     {
         fillResults = fillOrKillOrderInternal(
@@ -69,6 +69,7 @@ contract MixinWrapperFunctions is
         bytes memory signature
     )
         public
+        nonReentrant
         returns (FillResults memory fillResults)
     {
         // ABI encode calldata for `fillOrder`
@@ -88,14 +89,7 @@ contract MixinWrapperFunctions is
                 fillOrderCalldata,                  // write output over input
                 128                                 // output size is 128 bytes
             )
-            switch success
+            if success {
-            case 0 {
-                mstore(fillResults, 0)
-                mstore(add(fillResults, 32), 0)
-                mstore(add(fillResults, 64), 0)
-                mstore(add(fillResults, 96), 0)
-            }
-            case 1 {
                 mstore(fillResults, mload(fillOrderCalldata))
                 mstore(add(fillResults, 32), mload(add(fillOrderCalldata, 32)))
                 mstore(add(fillResults, 64), mload(add(fillOrderCalldata, 64)))
@@ -117,7 +111,7 @@ contract MixinWrapperFunctions is
         bytes[] memory signatures
     )
         public
-        nonReentrant
+        lockMutex
         returns (FillResults memory totalFillResults)
     {
         uint256 ordersLength = orders.length;
@@ -144,7 +138,7 @@ contract MixinWrapperFunctions is
         bytes[] memory signatures
     )
         public
-        nonReentrant
+        lockMutex
         returns (FillResults memory totalFillResults)
     {
         uint256 ordersLength = orders.length;
@@ -172,6 +166,7 @@ contract MixinWrapperFunctions is
         bytes[] memory signatures
     )
         public
+        nonReentrant
         returns (FillResults memory totalFillResults)
     {
         uint256 ordersLength = orders.length;
@@ -197,7 +192,7 @@ contract MixinWrapperFunctions is
         bytes[] memory signatures
     )
         public
-        nonReentrant
+        lockMutex
         returns (FillResults memory totalFillResults)
     {
         bytes memory takerAssetData = orders[0].takerAssetData;
@@ -242,6 +237,7 @@ contract MixinWrapperFunctions is
         bytes[] memory signatures
     )
         public
+        nonReentrant
         returns (FillResults memory totalFillResults)
     {
         bytes memory takerAssetData = orders[0].takerAssetData;
@@ -285,7 +281,7 @@ contract MixinWrapperFunctions is
         bytes[] memory signatures
     )
         public
-        nonReentrant
+        lockMutex
         returns (FillResults memory totalFillResults)
     {
         bytes memory makerAssetData = orders[0].makerAssetData;
@@ -338,6 +334,7 @@ contract MixinWrapperFunctions is
         bytes[] memory signatures
     )
         public
+        nonReentrant
         returns (FillResults memory totalFillResults)
     {
         bytes memory makerAssetData = orders[0].makerAssetData;