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feat: use extcodesize for isContract to reduce gas (#2311)

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* feat: use extcodesize for isContract to reduce gas

* feat: add changelog entry
This commit is contained in:
Julian M. Rodriguez
2020-07-14 17:08:41 -03:00
committed by GitHub
parent 98e862e162
commit c801c8d2bb
2 changed files with 12 additions and 7 deletions
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5
CHANGELOG.md
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@ -1,5 +1,10 @@
# Changelog
## 3.1.1 (Unreleased)
### Improvements
* `Address.isContract`: switched from `extcodehash` to `extcodesize` for less gas usage. ([#2311](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2311))
## 3.1.0 (2020-06-23)
### New features

14
contracts/utils/Address.sol
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@ -24,14 +24,14 @@ library Address {
* ====
*/
function isContract(address account) internal view returns (bool) {
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
// for accounts without code, i.e. `keccak256('')`
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
// This method relies in extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
// solhint-disable-next-line no-inline-assembly
assembly { codehash := extcodehash(account) }
return (codehash != accountHash && codehash != 0x0);
assembly { size := extcodesize(account) }
return size > 0;
}
/**