这个是 solidity 的常见错误，就是 solidity 嫌弃你方法所需参数过多。
- InternalCompilerError: Stack too deep, try removing local variables
参考资料
解决方案
重申一遍
这个是偶然之间发现的，如果你按照下面这样写就会报错
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pragma solidity ^0.8.4;
interface functionContract {
function swapExactTokensForTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
}
contract MultiTrade {
constructor() {
}
function tokenSwap(uint32 count, address[] calldata cexAddress, uint[] calldata amountIns, uint[] calldata amountOutMins, address[][] memory paths, address[] calldata tos, uint deadlines) public {
uint amountIn = amountIns[0];
for (uint i = 0; i < count; i++) {
address swapAddress = cexAddress[i];
address[] memory path = paths[i];
address base = path[0];
address token = path[path.length - 1];
address to = tos[i];
uint amountOut = amountOutMins[i];
functionContract routerCex = functionContract(swapAddress);
functionContract baseToken = functionContract(base);
functionContract tokenContract = functionContract(token);
if(baseToken.allowance(address(this),swapAddress) == 0){
baseToken.approve(swapAddress,type(uint256).max);
}
routerCex.swapExactTokensForTokens(amountIn,amountOut,path,to,deadlines);
amountIn = tokenContract.balanceOf(address(this));
}
}
}
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这个报错是说 deadlines 有 stacktoodeep，即上面代码的第 41 行。
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pragma solidity ^0.8.4;
interface functionContract {
function swapExactTokensForTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
}
contract MultiTrade {
constructor() {
}
function tokenSwap(uint32 count, address[] calldata cexAddress, uint[] calldata amountIns, uint[] calldata amountOutMins, address[][] memory paths, address[] calldata tos, uint deadlines) public {
uint amountIn = amountIns[0];
for (uint i = 0; i < count; i++) {
address swapAddress = cexAddress[i];
address[] memory path = paths[i];
address base = path[0];
address token = path[path.length - 1];
address to = tos[i];
uint amountOut = amountOutMins[i];
uint deadline = deadlines;
functionContract routerCex = functionContract(swapAddress);
functionContract baseToken = functionContract(base);
functionContract tokenContract = functionContract(token);
if(baseToken.allowance(address(this),swapAddress) == 0){
baseToken.approve(swapAddress,type(uint256).max);
}
routerCex.swapExactTokensForTokens(amountIn,amountOut,path,to,deadline);
amountIn = tokenContract.balanceOf(address(this));
}
}
}
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只需要加上一句
uint deadline = deadlines;
然后引用 deadline 就好了，非常的魔性。
