nimbus-eth1/tools/common/state_clearing.nim

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# Nimbus
# Copyright (c) 2023-2024 Status Research & Development GmbH
# Licensed under either of
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
# http://www.apache.org/licenses/LICENSE-2.0)
# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
# http://opensource.org/licenses/MIT)
# at your option. This file may not be copied, modified, or distributed except
# according to those terms.
import
../../nimbus/common/common,
../../nimbus/[evm/state, evm/types],
../../nimbus/db/ledger
proc coinbaseStateClearing*(vmState: BaseVMState,
miner: EthAddress,
touched = true) =
# This is necessary due to the manner in which the state tests are
# generated. State tests are generated from the BlockChainTest tests
# in which these transactions are included in the larger context of a
# block and thus, the mechanisms which would touch/create/clear the
# coinbase account based on the mining reward are present during test
# generation, but not part of the execution, thus we must artificially
# create the account in VMs prior to the state clearing rules,
# as well as conditionally cleaning up the coinbase account when left
# empty in VMs after the state clearing rules came into effect.
vmState.mutateStateDB:
if touched:
db.addBalance(miner, 0.u256)
# db.persist is an important step when using `db/ledger`
# it will affect the account storage's location
# during the next call to `getComittedStorage`
# and the result of rootHash
# do not clear cache, we need the cache when constructing
# post state
db.persist(clearEmptyAccount = vmState.fork >= FkSpurious)