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Refactor Blockhash lib (#5702)

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This commit is contained in:
Hadrien Croubois
2025-05-29 17:23:34 +02:00
committed by GitHub
parent a7d38c7a33
commit a6ae04acf8
1 changed files with 9 additions and 7 deletions
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16
contracts/utils/Blockhash.sol
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@ -32,19 +32,21 @@ library Blockhash {
distance = current - blockNumber;
}
return distance > 256 && distance <= 8191 ? _historyStorageCall(blockNumber) : blockhash(blockNumber);
return distance < 257 ? blockhash(blockNumber) : _historyStorageCall(blockNumber);
}
/// @dev Internal function to query the EIP-2935 history storage contract.
function _historyStorageCall(uint256 blockNumber) private view returns (bytes32 hash) {
assembly ("memory-safe") {
mstore(0, blockNumber) // Store the blockNumber in scratch space
// Store the blockNumber in scratch space
mstore(0x00, blockNumber)
mstore(0x20, 0)
// In case the history storage address is not deployed, the call will succeed
// without returndata, so the hash will be 0 just as querying `blockhash` directly.
if and(gt(returndatasize(), 0), staticcall(gas(), HISTORY_STORAGE_ADDRESS, 0, 0x20, 0, 0x20)) {
hash := mload(0)
}
// call history storage address
pop(staticcall(gas(), HISTORY_STORAGE_ADDRESS, 0x00, 0x20, 0x20, 0x20))
// load result
hash := mload(0x20)
}
}
}