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code-423n4 / 2022-04-phuture-findings

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Gas Optimizations #36

Open code423n4 opened 2 years ago

code423n4 commented 2 years ago

Custom Errors Should Be Used For Gas-optimization

Permalinks

  1. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/BaseIndex.sol#L29
  2. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/BaseIndex.sol#L34
  3. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/ChainlinkPriceOracle.sol#L51
  4. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/ChainlinkPriceOracle.sol#L61-L62
  5. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/ChainlinkPriceOracle.sol#L86
  6. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/IndexLogic.sol#L40
  7. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/IndexLogic.sol#L76
  8. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/IndexLogic.sol#L98
  9. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/ManagedIndex.sol#L28
  10. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/ManagedIndex.sol#L40-L48
  11. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/ManagedIndexReweightingLogic.sol#L29
  12. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/ManagedIndexReweightingLogic.sol#L52
  13. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/ManagedIndexReweightingLogic.sol#L58
  14. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/ManagedIndexReweightingLogic.sol#L62
  15. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/ManagedIndexReweightingLogic.sol#L85
  16. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/ManagedIndexReweightingLogic.sol#L104
  17. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/PhuturePriceOracle.sol#L38
  18. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/PhuturePriceOracle.sol#L46-L47
  19. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/PhuturePriceOracle.sol#L56
  20. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/PhuturePriceOracle.sol#L63
  21. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/PhuturePriceOracle.sol#L83
  22. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/PhuturePriceOracle.sol#L93
  23. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/TopNMarketCapIndex.sol#L45
  24. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/TopNMarketCapIndex.sol#L55
  25. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/TopNMarketCapIndexReweightingLogic.sol#L67
  26. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/TrackedIndex.sol#L30
  27. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/TrackedIndexReweightingLogic.sol#L38
  28. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/UniswapV2PathPriceOracle.sol#L24-L25
  29. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/UniswapV2PriceOracle.sol#L46
  30. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/UniswapV2PriceOracle.sol#L83
  31. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/vToken.sol#L46
  32. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/vToken.sol#L59-L60
  33. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/vToken.sol#L75
  34. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/libraries/IndexLibrary.sol#L29
  35. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/libraries/NAV.sol#L49
  36. https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/libraries/NAV.sol#L59

Description

Starting from Solidity v0.8.4, there is a convenient and gas-efficient way to explain to users why an operation failed through the use of custom errors. Until now, you could already use strings to give more information about failures (e.g., revert("Insufficient funds.");), but they are rather expensive, especially when it comes to deploy cost, and it is difficult to use dynamic information in them. Source: https://blog.soliditylang.org/2021/04/21/custom-errors/

Mitigation

Consider using custom errors instead if the contract uses solidity version 0.8.4 or above.

Prefix Increments Cost Less Gas Than Suffix Increments

Permalinks

https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/libraries/FullMath.sol#L124

Description

Using a prefix increment ++i costs less gas than a suffix increment i++.

Mitigation

Use prefix increment rather than suffix increment.

State Variables Can Be More Packed

Permalinks

https://github.com/code-423n4/2022-04-phuture/blob/594459d0865fb6603ba388b53f3f01648f5bb6fb/contracts/UniswapV2PriceOracle.sol#L29

Description

According to the fact that EVM is a stack-based machine with 256-bits size per stack. When the value are read or written in contract storage, a full 256-bits are read or written; so, packing multiple smaller variables in one slot can save more gas from reading and writing.

Mitigation

uint32 private blockTimestampLast can be declared next to the address public immutable override asset1 pack both variable in the same storage.