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Update GasChecker.sol #2

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Update GasChecker.sol #2

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20 changes: 16 additions & 4 deletions contracts/GasChecker.sol
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Original file line number Diff line number Diff line change
@@ -1,17 +1,29 @@
/**
* @title GasChecker
* @dev A contract that allows to check the gas cost of a function call
*/
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

contract GasChecker {
/**
* @dev Emitted when the actual gas cost is different than the expected one
* @param expected Expected gas cost
* @param actual Actual gas cost
*/
error GasCostDiffers(uint256 expected, uint256 actual);

/**
* @dev Modifier that checks the gas cost of a function call
* @param expected Expected gas cost
*/
modifier checkGasCost(uint256 expected) {
uint256 gas = gasleft();
uint256 gas = gasleft(); // Get the gas remaining at the beginning of the function call
_;
unchecked {
gas -= gasleft();
gas -= gasleft(); // Calculate the actual gas cost by subtracting the remaining gas at the end of the function call from the initial gas
}
if (expected > 0 && gas != expected) {
if (expected > 0 && gas != expected) { // If an expected gas cost is specified and it is not equal to the actual gas cost, revert
revert GasCostDiffers(expected, gas);
}
}
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