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[Enhancement] Optimize CairoLib Functions by Overloading with calldata for Gas Efficiency #11

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Summary

This pull request introduces optimizations to the CairoLib.sol library by overloading functions to accept calldata parameters instead of memory. These changes aim to enhance gas efficiency when interacting with Cairo contracts on Starknet.

Changes Introduced

  • Function Overloading with calldata:

    • Added overloaded versions of callCairo, staticcallCairo, and multicallCairo functions that accept calldata parameters.
    • Retained original memory parameter functions to ensure backward compatibility.
  • Code Adjustments:

    • Updated internal function calls to utilize the appropriate overloaded functions based on the data location.
    • Ensured consistency in encoding mechanisms (abi.encode) to handle both memory and calldata inputs effectively.

Rationale

Overloading functions with calldata parameters can lead to significant gas savings by eliminating unnecessary data copying into memory, especially for functions that do not modify input data. This optimization aligns with the feature request outlined in #8 and enhances the efficiency of interactions between Solidity and Cairo contracts.

Considerations

  • Backward Compatibility: The original functions with memory parameters are retained to prevent breaking existing integrations.
  • Compiler Ambiguity: Care was taken to avoid overloading based solely on string data locations to prevent compiler resolution issues.
  • Testing: While the changes have been tested locally and pass existing test suites, further review and testing within the project's CI/CD pipeline are recommended to ensure comprehensive coverage.

Related Issue #8

  • Optimization: kakarot-lib#8 - overload functions with calldata location.

Additional Notes

I understand that this contribution was not explicitly requested. However, considering the nature of the issue and the potential benefits of the proposed optimizations, I wanted to offer this solution. I'm open to feedback and willing to make further adjustments to better align with the project's goals and standards.

Please feel free to review the changes and let me know if there are any areas that require modification or additional testing. I'm eager to contribute and support the project's development in any way I can.

Checklist

  • I have read the Contributing Guidelines.
  • My code follows the project's code style.
  • My changes passes al of the tests.

Thank you for considering my contribution!

return callCairo(call.contractAddress, call.functionSelector, call.data);
}

function callCairo(uint256 contractAddress, uint256 functionSelector) internal returns (bytes memory) {
uint256[] memory data = new uint256[](0);
return callCairo(contractAddress, functionSelector, data);
return callCairo(contractAddress, functionSelector);
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I am not sure this can work: it would call itself recursively.
You would need to pass the data as the actual function overloaded has a third parameter.

@@ -19,7 +19,7 @@ library CairoLib {
/// @param functionSelector The function selector of the Cairo contract function to be called.
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As a general comment: you need to keep the memory version of the functions as most of the library is used inside a contract that would do some processing on the input data.
The code is in contradiction with your PR description as the memory version are removed

Backward Compatibility: The original functions with memory parameters are retained to prevent breaking existing integrations.

I think use cases need to be shown: this should to be done in sync with end-to-end tests in the kakarot repo to ensure the usage is relevant and functional. For now, all use case need preprocessing on input hence using calldata is not possible.
You can look at how this library is used in the following PRs.

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Alright, I will look more into that.

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2 participants