Ethereum 2.0: “Performance Returned: Arithmetic downstream or overflow” error
As Ethereum continues to develop and improve, new issues that may affect network stability and safety are found. One such problem is a mistake that affects a certain intelligent contract impact with Ethereum’s virtual machine (EVM). In this article, we examine the “performance return: arithmetic underflow or overflow” error details and explain what it means to your smart contracts.
What is “performance restored: arithmetic downstream or overflow” error?
“Performance is restored: arithmetic downstream or overflow” error occurs when an intelligent agreement tries to perform an arithmetic operation that causes a submerged (number less than zero) or overflow (total number than the maximum value that can be recorded in the int32 field). This error is typically due to incorrect processing of sliding numbers or other types of information.
How affects intelligent contracts?
The fault known as “integer” or “floating downstream of the point” occurs when an intelligent agreement tries to divide two integers integer. For example:
`
UINT256 Value = 123/456; //
Uint256 result = value; // wrong result
`
In this scenario, the / operator performs an integer, leading to result = 0. However, if the dividend is too small (eg the “value” is less than 456) or too large (eg” value “is greater than^2^256-1), the result is a sub-bleeding error.
Causes of error
The exact cause of this error may vary according to a particularly intelligent agreement and its implementation. However, general reasons include:
- Handling Incorrect handling of sliding tracks or other data types
- UsingUINT256
for signed integers
...
What does this mean to your smart contracts?
"Performance is restored: arithmetic downstream or overflow" error can have significant consequences for your intelligent contracts, especially those with valuable transactions. Some of the possible problems are:
- Incorrect handling of large numbers, leading to incorrect results and potential returns
- Failure to enter the user correctly, leading to errors and potential returns
- Rounding errors or other precision questions that can lead to unexpected behavior
Reducing Risk
It is necessary to alleviate this risk:
- Use the correct data types : Make sure that smart contracts use the correct data type for expected income and outputs.
2
- Test extensively : Perform thorough testing to identify and fix any problems before introducing an intelligent contract.
Understanding "Performance Restores: Arithmetic Low or Overflow" error, you can take action to mitigate its effect on intelligent contracts and ensure the stability and safety of Ethereum -based applications.
Example Correction
Preventing this error in a simple example:
Solidity
Pragman solidity ^0.8.0;
Contract simple {
UINT256 Public value;
Constructor (Address [] Memory Setting Dydus, Uint256 _Toltokenforsale, Uint256 _Softcap) {
// platform a sign with fixed value
value = 10000000000; // a million units of characters
}
Function transfer (address recipient, Uint256 quantity) Public {
if (amount> value) return (“inadequate balance”);
value -= quantity;
}
}
`
In this example, we have introduced a simple repair using the Token Uint256` data type and feeding the user by validating errors.
