nimbus-eth1/nimbus/vm_state.nim

119 lines
4.2 KiB
Nim

# 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
macros, strformat, tables,
eth_common, eth_trie/db,
./constants, ./errors, ./transaction, ./db/[db_chain, state_db],
./utils/header, json, vm_types, vm/transaction_tracer
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*(header: BlockHeader, chainDB: BaseChainDB, tracerFlags: set[TracerFlags] = {}): BaseVMState =
new result
result.prevHeaders = @[]
result.name = "BaseVM"
result.accessLogs = newAccessLogs()
result.blockHeader = header
result.chaindb = chainDB
result.tracer.initTracer(tracerFlags)
result.tracingEnabled = TracerFlags.EnableTracing in tracerFlags
method blockhash*(vmState: BaseVMState): Hash256 =
vmState.blockHeader.hash
method coinbase*(vmState: BaseVMState): EthAddress =
vmState.blockHeader.coinbase
method timestamp*(vmState: BaseVMState): EthTime =
vmState.blockHeader.timestamp
method blockNumber*(vmState: BaseVMState): BlockNumber =
vmState.blockHeader.blockNumber
method difficulty*(vmState: BaseVMState): UInt256 =
vmState.blockHeader.difficulty
method gasLimit*(vmState: BaseVMState): GasInt =
vmState.blockHeader.gasLimit
method getAncestorHash*(vmState: BaseVMState, blockNumber: BlockNumber): Hash256 =
var ancestorDepth = vmState.blockHeader.blockNumber - blockNumber - 1
if ancestorDepth >= constants.MAX_PREV_HEADER_DEPTH or ancestorDepth < 0:
return
let idx = ancestorDepth.toInt
if idx >= vmState.prevHeaders.len:
return
var header = vmState.prevHeaders[idx]
result = header.hash
when false:
# this was an older version of `mutateStateDB`, kept here for reference
# until `mutateStateDB` is fully implemented.
macro db*(vmState: untyped, readOnly: bool, 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
template mutateStateDB*(vmState: BaseVMState, body: untyped) =
# This should provide more clever change handling in the future
block:
let initialStateRoot = vmState.blockHeader.stateRoot
var db {.inject.} = vmState.chaindb.getStateDB(initialStateRoot, false)
body
let finalStateRoot = db.rootHash
if finalStateRoot != initialStateRoot:
vmState.blockHeader.stateRoot = finalStateRoot
proc readOnlyStateDB*(vmState: BaseVMState): AccountStateDB {.inline.}=
vmState.chaindb.getStateDb(vmState.blockHeader.stateRoot, readOnly = true)
export DbTransaction, commit, rollback, dispose, safeDispose
proc beginTransaction*(vmState: BaseVMState): DbTransaction =
vmState.chaindb.db.beginTransaction()
proc getTracingResult*(vmState: BaseVMState): JsonNode =
assert(vmState.tracingEnabled)
vmState.tracer.trace