Solidity - 堆栈太深

Question

我是编码新手，在 Solidity 中找不到解决 Stack too deep 错误的方法

function _getValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256, uint256, uint256, uint256, uint256) {
    (uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity, uint256 tCharity, uint256 tMarketing) = _getTValues(tAmount);
    (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tLiquidity, tCharity, tMarketing, _getRate());
    return (rAmount, rTransferAmount, rFee, tTransferAmount, tFee, tLiquidity, tCharity, tMarketing);
}

添加 tMarketing 后，我在第 3 行收到错误消息。

我尝试使用此处显示的逻辑解决我的问题：https://soliditydeveloper.com/stacktoodeep

我只是不知道如何正确应用它......

我需要帮助。谢谢大家

这是 _getValues() 函数的依赖项 - _getTValues() 和 _getRValues()（以及它们的依赖项）

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.4;

合约 STACKTOODEEP {

uint256 public _taxFee = 3; // 3% Redistributed to all holders
uint256 private _previousTaxFee = _taxFee;

uint256 public _liquidityFee = 3; // 3% Sent to PancakSwap Liquidity Pool
uint256 private _previousLiquidityFee = _liquidityFee;

uint256 public _charityFee = 2; // 2% Sent to Charity Wallet
uint256 private _previousCharityFee = _charityFee;

uint256 public _marketingFee = 2; // 2% Sent to Marketing Wallet
uint256 private _previousMarketingFee = _marketingFee;

function calculateTaxFee(uint256 _amount) private view returns (uint256) {
    return _amount.mul(_taxFee).div(
        10**2
    );
}

function calculateLiquidityFee(uint256 _amount) private view returns (uint256) {
    return _amount.mul(_liquidityFee).div(
        10**2
    );
}

function calculateCharityFee(uint256 _amount) private view returns (uint256) {
    return _amount.mul(_charityFee).div(
        10**2
    );
}

function calculateMarketingFee(uint256 _amount) private view returns (uint256) {
    return _amount.mul(_marketingFee).div(
        10**2
    );
}

function _getValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256, uint256, uint256, uint256, uint256) {
    (uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity, uint256 tCharity, uint256 tMarketing) = _getTValues(tAmount);
    (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tLiquidity, tCharity, tMarketing, _getRate());
    return (rAmount, rTransferAmount, rFee, tTransferAmount, tFee, tLiquidity, tCharity, tMarketing);
}

function _getTValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256, uint256) {
    uint256 tFee = calculateTaxFee(tAmount);
    uint256 tLiquidity = calculateLiquidityFee(tAmount);
    uint256 tCharity = calculateCharityFee(tAmount);
    uint256 tMarketing = calculateMarketingFee(tAmount);
    uint256 tTransferAmount = tAmount.sub(tFee).sub(tLiquidity);
    return (tTransferAmount, tFee, tLiquidity, tCharity, tMarketing);
}

function _getRValues(uint256 tAmount, uint256 tFee, uint256 tLiquidity, uint256 tCharity, uint256 tMarketing, uint256 currentRate) private pure returns (uint256, uint256, uint256) {
    uint256 rAmount = tAmount.mul(currentRate);
    uint256 rFee = tFee.mul(currentRate);
    uint256 rLiquidity = tLiquidity.mul(currentRate);
    uint256 rCharity = tCharity.mul(currentRate);
    uint256 rMarketing = tMarketing.mul(currentRate);
    uint256 rTransferAmount = rAmount.sub(rFee).sub(rLiquidity).sub(rCharity).sub(rMarketing);
    return (rAmount, rTransferAmount, rFee);
}

}

Answer 1

(uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tLiquidity, tCharity, tMarketing, _getRate());

此行会产生错误（请参阅下面的消息），因为您的代码中没有定义 _getRate() 函数。

DeclarationError：未声明的标识符。 --> Test.sol:45:125: | 45 | (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tLiquidity, tCharity, tMarketing, _getRate()); | ^^^^^^^^

从上下文来看，您似乎是从现有来源复制部分代码。确保您也包含_getRate() 函数。

出于测试目的，我创建了一个像这样的虚拟函数：

function _getRate() private view returns (uint256) {
    return 1;
}

---

那么您将遇到 SafeMath 库的未定义函数的问题，特别是 mul()（乘法）、div()（除法）和 sub()（减法）。

由于您使用的是 Solidity 0.8，因此不需要 SafeMath（但在旧版本中您会需要它），您可以将函数替换为标准算术运算。

示例 1：

_amount.mul(_taxFee).div(
    10**2
);

可以替换为

(_amount * _taxFee) / (10**2);

示例 2：

tAmount.sub(tFee).sub(tLiquidity);

可以替换为

tAmount - tFee - tLiquidity;