383 lines
12 KiB
Nim
383 lines
12 KiB
Nim
# Nimbus
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# Copyright (c) 2018 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
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# http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
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# http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except
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# according to those terms.
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import
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".."/[db/accounts_cache, constants],
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"."/[code_stream, memory, message, stack, state],
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"."/[transaction_tracer, types],
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./interpreter/[gas_meter, gas_costs, op_codes],
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../common/[common, evmforks],
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../utils/utils,
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chronicles, chronos,
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eth/[keys],
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sets
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export
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common
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logScope:
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topics = "vm computation"
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when defined(chronicles_log_level):
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import stew/byteutils
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when defined(evmc_enabled):
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import
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evmc/evmc,
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evmc_helpers,
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evmc_api,
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stew/ranges/ptr_arith
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export
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evmc,
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evmc_helpers,
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evmc_api,
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ptr_arith
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const
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evmc_enabled* = defined(evmc_enabled)
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# ------------------------------------------------------------------------------
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# Helpers
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# ------------------------------------------------------------------------------
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proc generateContractAddress(c: Computation, salt: ContractSalt): EthAddress =
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if c.msg.kind == evmcCreate:
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let creationNonce = c.vmState.readOnlyStateDB().getNonce(c.msg.sender)
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result = generateAddress(c.msg.sender, creationNonce)
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else:
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result = generateSafeAddress(c.msg.sender, salt, c.msg.data)
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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template getCoinbase*(c: Computation): EthAddress =
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when evmc_enabled:
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c.host.getTxContext().block_coinbase
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else:
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c.vmState.coinbase
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template getTimestamp*(c: Computation): int64 =
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when evmc_enabled:
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c.host.getTxContext().block_timestamp
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else:
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c.vmState.timestamp.toUnix
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template getBlockNumber*(c: Computation): UInt256 =
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when evmc_enabled:
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c.host.getTxContext().block_number.u256
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else:
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c.vmState.blockNumber.blockNumberToVmWord
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template getDifficulty*(c: Computation): DifficultyInt =
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when evmc_enabled:
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UInt256.fromEvmc c.host.getTxContext().block_prev_randao
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else:
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c.vmState.difficulty
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template getGasLimit*(c: Computation): GasInt =
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when evmc_enabled:
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c.host.getTxContext().block_gas_limit.GasInt
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else:
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c.vmState.gasLimit
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template getBaseFee*(c: Computation): UInt256 =
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when evmc_enabled:
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UInt256.fromEvmc c.host.getTxContext().block_base_fee
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else:
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c.vmState.baseFee
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template getChainId*(c: Computation): uint =
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when evmc_enabled:
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UInt256.fromEvmc(c.host.getTxContext().chain_id).truncate(uint)
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else:
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c.vmState.com.chainId.uint
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template getOrigin*(c: Computation): EthAddress =
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when evmc_enabled:
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c.host.getTxContext().tx_origin
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else:
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c.vmState.txOrigin
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template getGasPrice*(c: Computation): GasInt =
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when evmc_enabled:
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UInt256.fromEvmc(c.host.getTxContext().tx_gas_price).truncate(GasInt)
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else:
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c.vmState.txGasPrice
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proc getBlockHash*(c: Computation, number: UInt256): Hash256 =
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when evmc_enabled:
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let
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blockNumber = c.host.getTxContext().block_number.u256
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ancestorDepth = blockNumber - number - 1
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if ancestorDepth >= constants.MAX_PREV_HEADER_DEPTH:
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return
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if number >= blockNumber:
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return
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c.host.getBlockHash(number)
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else:
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let
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blockNumber = c.vmState.blockNumber
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ancestorDepth = blockNumber - number - 1
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if ancestorDepth >= constants.MAX_PREV_HEADER_DEPTH:
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return
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if number >= blockNumber:
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return
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c.vmState.getAncestorHash(number.vmWordToBlockNumber)
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template accountExists*(c: Computation, address: EthAddress): bool =
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when evmc_enabled:
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c.host.accountExists(address)
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else:
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if c.fork >= FkSpurious:
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not c.vmState.readOnlyStateDB.isDeadAccount(address)
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else:
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c.vmState.readOnlyStateDB.accountExists(address)
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template getStorage*(c: Computation, slot: UInt256): UInt256 =
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when evmc_enabled:
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c.host.getStorage(c.msg.contractAddress, slot)
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else:
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c.vmState.readOnlyStateDB.getStorage(c.msg.contractAddress, slot)
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template getBalance*(c: Computation, address: EthAddress): UInt256 =
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when evmc_enabled:
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c.host.getBalance(address)
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else:
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c.vmState.readOnlyStateDB.getBalance(address)
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template getCodeSize*(c: Computation, address: EthAddress): uint =
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when evmc_enabled:
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c.host.getCodeSize(address)
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else:
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uint(c.vmState.readOnlyStateDB.getCodeSize(address))
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template getCodeHash*(c: Computation, address: EthAddress): Hash256 =
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when evmc_enabled:
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c.host.getCodeHash(address)
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else:
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let
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db = c.vmState.readOnlyStateDB
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if not db.accountExists(address) or db.isEmptyAccount(address):
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default(Hash256)
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else:
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db.getCodeHash(address)
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template selfDestruct*(c: Computation, address: EthAddress) =
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when evmc_enabled:
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c.host.selfDestruct(c.msg.contractAddress, address)
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else:
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c.execSelfDestruct(address)
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template getCode*(c: Computation, address: EthAddress): seq[byte] =
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when evmc_enabled:
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c.host.copyCode(address)
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else:
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c.vmState.readOnlyStateDB.getCode(address)
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proc newComputation*(vmState: BaseVMState, message: Message,
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salt: ContractSalt = ZERO_CONTRACTSALT): Computation =
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new result
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result.vmState = vmState
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result.msg = message
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result.memory = Memory()
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result.stack = newStack()
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result.returnStack = @[]
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result.gasMeter.init(message.gas)
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result.touchedAccounts = initHashSet[EthAddress]()
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result.selfDestructs = initHashSet[EthAddress]()
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if result.msg.isCreate():
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result.msg.contractAddress = result.generateContractAddress(salt)
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result.code = newCodeStream(message.data)
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message.data = @[]
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else:
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result.code = newCodeStream(
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vmState.readOnlyStateDB.getCode(message.codeAddress))
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proc newComputation*(vmState: BaseVMState, message: Message, code: seq[byte]): Computation =
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new result
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result.vmState = vmState
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result.msg = message
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result.memory = Memory()
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result.stack = newStack()
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result.returnStack = @[]
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result.gasMeter.init(message.gas)
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result.touchedAccounts = initHashSet[EthAddress]()
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result.selfDestructs = initHashSet[EthAddress]()
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result.code = newCodeStream(code)
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template gasCosts*(c: Computation): untyped =
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c.vmState.gasCosts
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template fork*(c: Computation): untyped =
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c.vmState.fork
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proc isOriginComputation*(c: Computation): bool =
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# Is this computation the computation initiated by a transaction
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c.msg.sender == c.vmState.txOrigin
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template isSuccess*(c: Computation): bool =
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c.error.isNil
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template isError*(c: Computation): bool =
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not c.isSuccess
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func shouldBurnGas*(c: Computation): bool =
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c.isError and c.error.burnsGas
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proc isSelfDestructed*(c: Computation, address: EthAddress): bool =
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result = address in c.selfDestructs
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proc snapshot*(c: Computation) =
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c.savePoint = c.vmState.stateDB.beginSavepoint()
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proc commit*(c: Computation) =
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c.vmState.stateDB.commit(c.savePoint)
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proc dispose*(c: Computation) {.inline.} =
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c.vmState.stateDB.safeDispose(c.savePoint)
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c.savePoint = nil
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proc rollback*(c: Computation) =
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c.vmState.stateDB.rollback(c.savePoint)
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proc setError*(c: Computation, msg: string, burnsGas = false) {.inline.} =
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c.error = Error(info: msg, burnsGas: burnsGas)
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proc writeContract*(c: Computation) =
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template withExtra(tracer: untyped, args: varargs[untyped]) =
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tracer args, newContract=($c.msg.contractAddress),
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blockNumber=c.vmState.blockNumber,
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parentHash=($c.vmState.parent.blockHash)
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# In each check below, they are guarded by `len > 0`. This includes writing
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# out the code, because the account already has zero-length code to handle
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# nested calls (this is specified). May as well simplify other branches.
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let (len, fork) = (c.output.len, c.fork)
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if len == 0:
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return
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# EIP-3541 constraint (https://eips.ethereum.org/EIPS/eip-3541).
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if fork >= FkLondon and c.output[0] == 0xEF.byte:
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withExtra trace, "New contract code starts with 0xEF byte, not allowed by EIP-3541"
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# TODO: Return `EVMC_CONTRACT_VALIDATION_FAILURE` (like Silkworm).
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c.setError("EVMC_CONTRACT_VALIDATION_FAILURE", true)
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return
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# EIP-170 constraint (https://eips.ethereum.org/EIPS/eip-3541).
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if fork >= FkSpurious and len > EIP170_MAX_CODE_SIZE:
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withExtra trace, "New contract code exceeds EIP-170 limit",
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codeSize=len, maxSize=EIP170_MAX_CODE_SIZE
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# TODO: Return `EVMC_OUT_OF_GAS` (like Silkworm).
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c.setError("EVMC_OUT_OF_GAS", true)
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return
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# Charge gas and write the code even if the code address is self-destructed.
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# Non-empty code in a newly created, self-destructed account is possible if
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# the init code calls `DELEGATECALL` or `CALLCODE` to other code which uses
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# `SELFDESTRUCT`. This shows on Mainnet blocks 6001128..6001204, where the
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# gas difference matters. The new code can be called later in the
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# transaction too, before self-destruction wipes the account at the end.
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let gasParams = GasParams(kind: Create, cr_memLength: len)
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let codeCost = c.gasCosts[Create].c_handler(0.u256, gasParams).gasCost
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if codeCost <= c.gasMeter.gasRemaining:
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c.gasMeter.consumeGas(codeCost, reason = "Write new contract code")
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c.vmState.mutateStateDB:
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db.setCode(c.msg.contractAddress, c.output)
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withExtra trace, "Writing new contract code"
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return
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if fork >= FkHomestead:
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# EIP-2 (https://eips.ethereum.org/EIPS/eip-2).
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# TODO: Return `EVMC_OUT_OF_GAS` (like Silkworm).
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c.setError("EVMC_OUT_OF_GAS", true)
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else:
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# Before EIP-2, when out of gas for code storage, the account ends up with
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# zero-length code and no error. No gas is charged. Code cited in EIP-2:
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# https://github.com/ethereum/pyethereum/blob/d117c8f3fd93/ethereum/processblock.py#L304
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# https://github.com/ethereum/go-ethereum/blob/401354976bb4/core/vm/instructions.go#L586
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# The account already has zero-length code to handle nested calls.
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withExtra trace, "New contract given empty code by pre-Homestead rules"
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template chainTo*(c: Computation, toChild: typeof(c.child), after: untyped) =
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c.child = toChild
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c.continuation = proc() =
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c.continuation = nil
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after
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# Register an async operation to be performed before the continuation is called.
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template asyncChainTo*(c: Computation, asyncOperation: Future[void], after: untyped) =
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c.pendingAsyncOperation = asyncOperation
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c.continuation = proc() =
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c.continuation = nil
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after
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proc merge*(c, child: Computation) =
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c.logEntries.add child.logEntries
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c.gasMeter.refundGas(child.gasMeter.gasRefunded)
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c.selfDestructs.incl child.selfDestructs
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c.touchedAccounts.incl child.touchedAccounts
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proc execSelfDestruct*(c: Computation, beneficiary: EthAddress) =
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c.vmState.mutateStateDB:
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let
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localBalance = c.getBalance(c.msg.contractAddress)
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beneficiaryBalance = c.getBalance(beneficiary)
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# Transfer to beneficiary
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db.setBalance(beneficiary, localBalance + beneficiaryBalance)
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# Zero the balance of the address being deleted.
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# This must come after sending to beneficiary in case the
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# contract named itself as the beneficiary.
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db.setBalance(c.msg.contractAddress, 0.u256)
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trace "SELFDESTRUCT",
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contractAddress = c.msg.contractAddress.toHex,
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localBalance = localBalance.toString,
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beneficiary = beneficiary.toHex
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c.touchedAccounts.incl beneficiary
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# Register the account to be deleted
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c.selfDestructs.incl(c.msg.contractAddress)
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proc addLogEntry*(c: Computation, log: Log) {.inline.} =
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c.logEntries.add(log)
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proc getGasRefund*(c: Computation): GasInt =
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if c.isSuccess:
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result = c.gasMeter.gasRefunded
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proc refundSelfDestruct*(c: Computation) =
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let cost = gasFees[c.fork][RefundSelfDestruct]
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c.gasMeter.refundGas(cost * c.selfDestructs.len)
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proc tracingEnabled*(c: Computation): bool {.inline.} =
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TracerFlags.EnableTracing in c.vmState.tracer.flags
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proc traceOpCodeStarted*(c: Computation, op: Op): int {.inline.} =
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c.vmState.tracer.traceOpCodeStarted(c, op)
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proc traceOpCodeEnded*(c: Computation, op: Op, lastIndex: int) {.inline.} =
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c.vmState.tracer.traceOpCodeEnded(c, op, lastIndex)
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proc traceError*(c: Computation) {.inline.} =
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c.vmState.tracer.traceError(c)
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proc prepareTracer*(c: Computation) {.inline.} =
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c.vmState.tracer.prepare(c.msg.depth)
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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