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// SPDX-License-Identifier: MIT
pragma solidity 0.8.15;
import { L1Block } from "../L2/L1Block.sol";
import { Predeploys } from "../libraries/Predeploys.sol";
import { Semver } from "../universal/Semver.sol";
/**
* @custom:legacy
* @custom:proxied
* @custom:predeploy 0x4200000000000000000000000000000000000013
* @title L1BlockNumber
* @notice L1BlockNumber is a legacy contract that fills the roll of the OVM_L1BlockNumber contract
* in the old version of the Optimism system. Only necessary for backwards compatibility.
* If you want to access the L1 block number going forward, you should use the L1Block
* contract instead.
*/
contract L1BlockNumber is Semver {
/**
* @custom:semver 0.0.1
*/
constructor() Semver(0, 0, 1) {}
/**
* @notice Returns the L1 block number.
*/
receive() external payable {
uint256 l1BlockNumber = getL1BlockNumber();
assembly {
mstore(0, l1BlockNumber)
return(0, 32)
}
}
/**
* @notice Returns the L1 block number.
*/
// solhint-disable-next-line no-complex-fallback
fallback() external payable {
uint256 l1BlockNumber = getL1BlockNumber();
assembly {
mstore(0, l1BlockNumber)
return(0, 32)
}
}
/**
* @notice Retrieves the latest L1 block number.
*
* @return Latest L1 block number.
*/
function getL1BlockNumber() public view returns (uint256) {
return L1Block(Predeploys.L1_BLOCK_ATTRIBUTES).number();
}
}