# Nimbus # Copyright (c) 2018-2024 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. {.push raises: [].} import std/[options, sets, strformat], stew/assign2, eth/keys, ../db/ledger, ../common/[common, evmforks], ./interpreter/[op_codes, gas_costs], ./types, ./evm_errors proc init( self: BaseVMState; ac: LedgerRef, parent: BlockHeader; blockCtx: BlockContext; com: CommonRef; tracer: TracerRef, flags: set[VMFlag] = self.flags) = ## Initialisation helper assign(self.parent, parent) self.blockCtx = blockCtx self.gasPool = blockCtx.gasLimit self.com = com self.tracer = tracer self.stateDB = ac self.flags = flags self.blobGasUsed = 0'u64 func blockCtx(com: CommonRef, header: BlockHeader): BlockContext = BlockContext( timestamp : header.timestamp, gasLimit : header.gasLimit, baseFeePerGas: header.baseFeePerGas, prevRandao : header.prevRandao, difficulty : header.difficulty, coinbase : com.minerAddress(header), excessBlobGas: header.excessBlobGas.get(0'u64), ) # -------------- proc `$`*(vmState: BaseVMState): string {.gcsafe, raises: [].} = if vmState.isNil: result = "nil" else: result = &"VMState:"& &"\n blockNumber: {vmState.parent.number + 1}" proc new*( T: type BaseVMState; parent: BlockHeader; ## parent header, account sync position blockCtx: BlockContext; com: CommonRef; ## block chain config tracer: TracerRef = nil): T = ## Create a new `BaseVMState` descriptor from a parent block header. This ## function internally constructs a new account state cache rooted at ## `parent.stateRoot` ## ## This `new()` constructor and its variants (see below) provide a save ## `BaseVMState` environment where the account state cache is synchronised ## with the `parent` block header. new result result.init( ac = LedgerRef.init(com.db, parent.stateRoot), parent = parent, blockCtx = blockCtx, com = com, tracer = tracer) proc reinit*(self: BaseVMState; ## Object descriptor parent: BlockHeader; ## parent header, account sync pos. blockCtx: BlockContext; linear: bool ): bool = ## Re-initialise state descriptor. The `LedgerRef` database is ## re-initilaise only if its `rootHash` doe not point to `parent.stateRoot`, ## already. Accumulated state data are reset. When linear, we assume that ## the state recently processed the parent block. ## ## This function returns `true` unless the `LedgerRef` database could be ## queries about its `rootHash`, i.e. `isTopLevelClean` evaluated `true`. If ## this function returns `false`, the function argument `self` is left ## untouched. if self.stateDB.isTopLevelClean: let tracer = self.tracer com = self.com db = com.db ac = if linear or self.stateDB.rootHash == parent.stateRoot: self.stateDB else: LedgerRef.init(db, parent.stateRoot) flags = self.flags self[].reset self.init( ac = ac, parent = parent, blockCtx = blockCtx, com = com, tracer = tracer, flags = flags) return true # else: false proc reinit*(self: BaseVMState; ## Object descriptor parent: BlockHeader; ## parent header, account sync pos. header: BlockHeader; ## header with tx environment data fields linear: bool ): bool = ## Variant of `reinit()`. The `parent` argument is used to sync the accounts ## cache and the `header` is used as a container to pass the `timestamp`, ## `gasLimit`, and `fee` values. ## ## It requires the `header` argument properly initalised so that for PoA ## networks, the miner address is retrievable via `ecRecover()`. self.reinit( parent = parent, blockCtx = self.com.blockCtx(header), linear = linear ) proc reinit*(self: BaseVMState; ## Object descriptor header: BlockHeader; ## header with tx environment data fields ): bool = ## This is a variant of the `reinit()` function above where the field ## `header.parentHash`, is used to fetch the `parent` BlockHeader to be ## used in the `update()` variant, above. var parent: BlockHeader self.com.db.getBlockHeader(header.parentHash, parent) and self.reinit( parent = parent, header = header, linear = false) proc init*( self: BaseVMState; ## Object descriptor parent: BlockHeader; ## parent header, account sync position header: BlockHeader; ## header with tx environment data fields com: CommonRef; ## block chain config tracer: TracerRef = nil) = ## Variant of `new()` constructor above for in-place initalisation. The ## `parent` argument is used to sync the accounts cache and the `header` ## is used as a container to pass the `timestamp`, `gasLimit`, and `fee` ## values. ## ## It requires the `header` argument properly initalised so that for PoA ## networks, the miner address is retrievable via `ecRecover()`. self.init( ac = LedgerRef.init(com.db, parent.stateRoot), parent = parent, blockCtx = com.blockCtx(header), com = com, tracer = tracer) proc new*( T: type BaseVMState; parent: BlockHeader; ## parent header, account sync position header: BlockHeader; ## header with tx environment data fields com: CommonRef; ## block chain config tracer: TracerRef = nil): T = ## This is a variant of the `new()` constructor above where the `parent` ## argument is used to sync the accounts cache and the `header` is used ## as a container to pass the `timestamp`, `gasLimit`, and `fee` values. ## ## It requires the `header` argument properly initalised so that for PoA ## networks, the miner address is retrievable via `ecRecover()`. new result result.init( parent = parent, header = header, com = com, tracer = tracer) proc new*( T: type BaseVMState; header: BlockHeader; ## header with tx environment data fields com: CommonRef; ## block chain config tracer: TracerRef = nil): EvmResult[T] = ## This is a variant of the `new()` constructor above where the field ## `header.parentHash`, is used to fetch the `parent` BlockHeader to be ## used in the `new()` variant, above. var parent: BlockHeader if com.db.getBlockHeader(header.parentHash, parent): ok(BaseVMState.new( parent = parent, header = header, com = com, tracer = tracer)) else: err(evmErr(EvmHeaderNotFound)) proc init*( vmState: BaseVMState; header: BlockHeader; ## header with tx environment data fields com: CommonRef; ## block chain config tracer: TracerRef = nil): bool = ## Variant of `new()` which does not throw an exception on a dangling ## `BlockHeader` parent hash reference. var parent: BlockHeader if com.db.getBlockHeader(header.parentHash, parent): vmState.init( parent = parent, header = header, com = com, tracer = tracer) return true proc coinbase*(vmState: BaseVMState): EthAddress = vmState.blockCtx.coinbase proc blockNumber*(vmState: BaseVMState): BlockNumber = # it should return current block number # and not head.number vmState.parent.number + 1 proc difficultyOrPrevRandao*(vmState: BaseVMState): UInt256 = if vmState.com.consensus == ConsensusType.POS: # EIP-4399/EIP-3675 UInt256.fromBytesBE(vmState.blockCtx.prevRandao.data) else: vmState.blockCtx.difficulty proc baseFeePerGas*(vmState: BaseVMState): UInt256 = vmState.blockCtx.baseFeePerGas.get(0.u256) method getAncestorHash*( vmState: BaseVMState, blockNumber: BlockNumber): Hash256 {.gcsafe, base.} = let db = vmState.com.db try: var blockHash: Hash256 if db.getBlockHash(blockNumber, blockHash): blockHash else: Hash256() except RlpError: Hash256() proc readOnlyStateDB*(vmState: BaseVMState): ReadOnlyStateDB {.inline.} = ReadOnlyStateDB(vmState.stateDB) template mutateStateDB*(vmState: BaseVMState, body: untyped) = block: var db {.inject.} = vmState.stateDB body proc getAndClearLogEntries*(vmState: BaseVMState): seq[Log] = vmState.stateDB.getAndClearLogEntries() proc status*(vmState: BaseVMState): bool = ExecutionOK in vmState.flags proc `status=`*(vmState: BaseVMState, status: bool) = if status: vmState.flags.incl ExecutionOK else: vmState.flags.excl ExecutionOK proc collectWitnessData*(vmState: BaseVMState): bool = CollectWitnessData in vmState.flags proc `collectWitnessData=`*(vmState: BaseVMState, status: bool) = if status: vmState.flags.incl CollectWitnessData else: vmState.flags.excl CollectWitnessData func forkDeterminationInfoForVMState*(vmState: BaseVMState): ForkDeterminationInfo = # FIXME-Adam: Is this timestamp right? Note that up above in blockNumber we add 1; # should timestamp be adding 12 or something? # Also, can I get the TD? Do I need to? forkDeterminationInfo(vmState.blockNumber, vmState.blockCtx.timestamp) func determineFork*(vmState: BaseVMState): EVMFork = vmState.com.toEVMFork(vmState.forkDeterminationInfoForVMState) func tracingEnabled*(vmState: BaseVMState): bool = vmState.tracer.isNil.not proc captureTxStart*(vmState: BaseVMState, gasLimit: GasInt) = if vmState.tracingEnabled: vmState.tracer.captureTxStart(gasLimit) proc captureTxEnd*(vmState: BaseVMState, restGas: GasInt) = if vmState.tracingEnabled: vmState.tracer.captureTxEnd(restGas) proc captureStart*(vmState: BaseVMState, comp: Computation, sender: EthAddress, to: EthAddress, create: bool, input: openArray[byte], gasLimit: GasInt, value: UInt256) = if vmState.tracingEnabled: vmState.tracer.captureStart(comp, sender, to, create, input, gasLimit, value) proc captureEnd*(vmState: BaseVMState, comp: Computation, output: openArray[byte], gasUsed: GasInt, error: Opt[string]) = if vmState.tracingEnabled: vmState.tracer.captureEnd(comp, output, gasUsed, error) proc captureEnter*(vmState: BaseVMState, comp: Computation, op: Op, sender: EthAddress, to: EthAddress, input: openArray[byte], gasLimit: GasInt, value: UInt256) = if vmState.tracingEnabled: vmState.tracer.captureEnter(comp, op, sender, to, input, gasLimit, value) proc captureExit*(vmState: BaseVMState, comp: Computation, output: openArray[byte], gasUsed: GasInt, error: Opt[string]) = if vmState.tracingEnabled: vmState.tracer.captureExit(comp, output, gasUsed, error) proc captureOpStart*(vmState: BaseVMState, comp: Computation, pc: int, op: Op, gas: GasInt, depth: int): int = if vmState.tracingEnabled: let fixed = vmState.gasCosts[op].kind == GckFixed result = vmState.tracer.captureOpStart(comp, fixed, pc, op, gas, depth) proc captureGasCost*(vmState: BaseVMState, comp: Computation, op: Op, gasCost: GasInt, gasRemaining: GasInt, depth: int) = if vmState.tracingEnabled: let fixed = vmState.gasCosts[op].kind == GckFixed vmState.tracer.captureGasCost(comp, fixed, op, gasCost, gasRemaining, depth) proc captureOpEnd*(vmState: BaseVMState, comp: Computation, pc: int, op: Op, gas: GasInt, refund: GasInt, rData: openArray[byte], depth: int, opIndex: int) = if vmState.tracingEnabled: let fixed = vmState.gasCosts[op].kind == GckFixed vmState.tracer.captureOpEnd(comp, fixed, pc, op, gas, refund, rData, depth, opIndex) proc captureFault*(vmState: BaseVMState, comp: Computation, pc: int, op: Op, gas: GasInt, refund: GasInt, rData: openArray[byte], depth: int, error: Opt[string]) = if vmState.tracingEnabled: let fixed = vmState.gasCosts[op].kind == GckFixed vmState.tracer.captureFault(comp, fixed, pc, op, gas, refund, rData, depth, error) proc capturePrepare*(vmState: BaseVMState, comp: Computation, depth: int) = if vmState.tracingEnabled: vmState.tracer.capturePrepare(comp, depth)