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-rw-r--r--packages/contracts/contracts/protocol/AssetProxy/MultiAssetProxy.sol26
-rw-r--r--packages/contracts/test/asset_proxy/proxies.ts1
2 files changed, 18 insertions, 9 deletions
diff --git a/packages/contracts/contracts/protocol/AssetProxy/MultiAssetProxy.sol b/packages/contracts/contracts/protocol/AssetProxy/MultiAssetProxy.sol
index 6db42e44f..42231e73b 100644
--- a/packages/contracts/contracts/protocol/AssetProxy/MultiAssetProxy.sol
+++ b/packages/contracts/contracts/protocol/AssetProxy/MultiAssetProxy.sol
@@ -18,13 +18,11 @@
pragma solidity 0.4.24;
-import "../../utils/SafeMath/SafeMath.sol";
import "../Exchange/MixinAssetProxyDispatcher.sol";
import "./MixinAuthorizable.sol";
contract MultiAssetProxy is
- SafeMath,
MixinAssetProxyDispatcher,
MixinAuthorizable
{
@@ -172,6 +170,10 @@ contract MultiAssetProxy is
// Calculate number of bytes in `amounts` contents
let amountsByteLen := mul(amountsLen, 32)
+ // Initialize `assetProxyId` and `assetProxy` to 0
+ let assetProxyId := 0
+ let assetProxy := 0
+
// Loop through `amounts` and `nestedAssetData`, calling `transferFrom` for each respective element
for {let i := 0} lt(i, amountsByteLen) {i := add(i, 32)} {
@@ -221,16 +223,22 @@ contract MultiAssetProxy is
}
// Load AssetProxy id
- let assetProxyId := and(
+ let currentAssetProxyId := and(
calldataload(nestedAssetDataElementContentsStart),
0xffffffff00000000000000000000000000000000000000000000000000000000
)
- // To lookup a value in a mapping, we load from the storage location keccak256(k, p),
- // where k is the key left padded to 32 bytes and p is the storage slot
- mstore(132, assetProxyId)
- mstore(164, assetProxies_slot)
- let assetProxy := sload(keccak256(132, 64))
+ // Only load `assetProxy` if `currentAssetProxyId` does not equal `assetProxyId`
+ // We do not need to check if `currentAssetProxyId` is 0 since `assetProxy` is also initialized to 0
+ if iszero(eq(currentAssetProxyId, assetProxyId)) {
+ // Update `assetProxyId`
+ assetProxyId := currentAssetProxyId
+ // To lookup a value in a mapping, we load from the storage location keccak256(k, p),
+ // where k is the key left padded to 32 bytes and p is the storage slot
+ mstore(132, assetProxyId)
+ mstore(164, assetProxies_slot)
+ assetProxy := sload(keccak256(132, 64))
+ }
// Revert if AssetProxy with given id does not exist
if iszero(assetProxy) {
@@ -257,7 +265,7 @@ contract MultiAssetProxy is
0, // pointer to start of input
add(164, nestedAssetDataElementLen), // length of input
0, // write output over memory that won't be reused
- 0 // reserve 512 bytes for output
+ 0 // don't copy output to memory
)
// Revert with reason given by AssetProxy if `transferFrom` call failed
diff --git a/packages/contracts/test/asset_proxy/proxies.ts b/packages/contracts/test/asset_proxy/proxies.ts
index face0b92b..8fa1e602a 100644
--- a/packages/contracts/test/asset_proxy/proxies.ts
+++ b/packages/contracts/test/asset_proxy/proxies.ts
@@ -695,6 +695,7 @@ describe('Asset Transfer Proxies', () => {
});
it('should have an id of 0x94cfcdd7', async () => {
const proxyId = await multiAssetProxy.getProxyId.callAsync();
+ // first 4 bytes of `keccak256('MultiAsset(uint256[],bytes[])')`
const expectedProxyId = '0x94cfcdd7';
expect(proxyId).to.equal(expectedProxyId);
});