如何修复 Solidity 上的 Stack Too Deep 错误？

Question

在稳固性上，我不断收到“堆栈太深”的错误。 我想知道是否有人可以通过以下代码帮助我解决此问题：

function _getTValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256, uint256, uint256) {
        uint256 tFee = calculateTaxFee(tAmount);
        uint256 tLiquidity = calculateLiquidityFee(tAmount);
        uint256 tDev = calculateDevFee(tAmount);
        uint256 tBurn = calculateBurnFee(tAmount);
        uint256 tCharity = calculateCharityFee(tAmount);
        uint256 tTransferAmount = tAmount.sub(tFee).sub(tLiquidity);
                tTransferAmount = tTransferAmount.sub(tDev);
                tTransferAmount = tTransferAmount.sub(tCharity);
                tTransferAmount = tTransferAmount.sub(tBurn);

        return (tTransferAmount, tFee, tLiquidity, tDev, tBurn, tCharity);
    }

谢谢！

Answer 1

您不能拥有超过 16 个局部变量 (iirc)，但在这种特殊情况下，您并不真正需要它们。 Safemoon 有很多冗余代码，尤其是在getValues和transfer函数中。 I suggest you have a look at the way this is done in SafeToken - https://github.com/solidity-guru/safetoken/blob/main/safetoken.sol

_getTValues计算所有这些 t 值的唯一原因是从tTransferAmount中减去它们......但您可以只使用所有费用的总和，例如

function _getTValues(uint256 tAmount) ... {
    uint256 tFeesSum = calculateSumOfFees(tAmount);
    uint256 tTransferAmount = tAmount - tFeesSum; // no need to use SafeMath in solidity ^0.8
    return tTransferAmount;
}