nimbus-eth1/nimbus/vm_state.nim

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# Nimbus
# Copyright (c) 2018 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
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macros, strformat, tables,
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stint, eth_common,
./logging, ./constants, ./errors, ./transaction, ./db/[db_chain, state_db],
./utils/header
type
BaseVMState* = ref object of RootObj
prevHeaders*: seq[BlockHeader]
# receipts*:
chaindb*: BaseChainDB
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accessLogs*: AccessLogs
blockHeader*: BlockHeader
name*: string
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AccessLogs* = ref object
reads*: Table[string, string]
writes*: Table[string, string]
proc newAccessLogs*: AccessLogs =
AccessLogs(reads: initTable[string, string](), writes: initTable[string, string]())
proc update*[K, V](t: var Table[K, V], elements: Table[K, V]) =
for k, v in elements:
t[k] = v
proc `$`*(vmState: BaseVMState): string =
if vmState.isNil:
result = "nil"
else:
result = &"VMState {vmState.name}:\n header: {vmState.blockHeader}\n chaindb: {vmState.chaindb}"
proc newBaseVMState*: BaseVMState =
new(result)
result.prevHeaders = @[]
result.name = "BaseVM"
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result.accessLogs = newAccessLogs()
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# result.blockHeader = # TODO...
method logger*(vmState: BaseVMState): Logger =
logging.getLogger(&"evm.vmState.{vmState.name}")
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method blockhash*(vmState: BaseVMState): Hash256 =
vmState.blockHeader.hash
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method coinbase*(vmState: BaseVMState): EthAddress =
vmState.blockHeader.coinbase
method timestamp*(vmState: BaseVMState): EthTime =
vmState.blockHeader.timestamp
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method blockNumber*(vmState: BaseVMState): BlockNumber =
vmState.blockHeader.blockNumber
method difficulty*(vmState: BaseVMState): UInt256 =
vmState.blockHeader.difficulty
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method gasLimit*(vmState: BaseVMState): GasInt =
vmState.blockHeader.gasLimit
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method getAncestorHash*(vmState: BaseVMState, blockNumber: BlockNumber): Hash256 =
var ancestorDepth = vmState.blockHeader.blockNumber - blockNumber - 1.u256
if ancestorDepth >= constants.MAX_PREV_HEADER_DEPTH or
ancestorDepth < 0 or
ancestorDepth >= vmState.prevHeaders.len.u256:
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return
var header = vmState.prevHeaders[ancestorDepth.toInt]
result = header.hash
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macro db*(vmState: untyped, readOnly: untyped, handler: untyped): untyped =
# vm.state.db:
# setupStateDB(fixture{"pre"}, stateDb)
# code = db.getCode(fixture{"exec"}{"address"}.getStr)
let db = ident("db")
result = quote:
block:
var `db` = `vmState`.chaindb.getStateDB(`vmState`.blockHeader.stateRoot, `readOnly`)
`handler`
if `readOnly`:
# This acts as a secondary check that no mutation took place for
# read_only databases.
assert `db`.rootHash == `vmState`.blockHeader.stateRoot
elif `vmState`.blockHeader.stateRoot != `db`.rootHash:
`vmState`.blockHeader.stateRoot = `db`.rootHash
# TODO
# `vmState`.accessLogs.reads.update(`db`.db.accessLogs.reads)
# `vmState`.accessLogs.writes.update(`db`.db.accessLogs.writes)
# remove the reference to the underlying `db` object to ensure that no
# further modifications can occur using the `State` object after
# leaving the context.
# TODO `db`.db = nil
# state._trie = None
proc readOnlyStateDB*(vmState: BaseVMState): AccountStateDB {.inline.}=
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vmState.chaindb.getStateDb(Hash256(), readOnly = true)