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nimbus-eth1/nimbus/evm/computation.nim

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# 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
".."/[db/ledger, constants],
"."/[code_stream, memory, message, stack, state],
"."/[types],
./interpreter/[gas_meter, gas_costs, op_codes],
./evm_errors,
../common/[common, evmforks],
../utils/utils,
stew/byteutils,
chronicles, chronos,
eth/[keys],
sets
export
common
logScope:
topics = "vm computation"
when defined(evmc_enabled):
import
evmc/evmc,
evmc_helpers,
evmc_api,
stew/ptrops
export
evmc,
evmc_helpers,
evmc_api,
ptrops
const
evmc_enabled* = defined(evmc_enabled)
# ------------------------------------------------------------------------------
# Helpers
# ------------------------------------------------------------------------------
proc generateContractAddress(c: Computation, salt: ContractSalt): EthAddress =
if c.msg.kind == EVMC_CREATE:
let creationNonce = c.vmState.readOnlyStateDB().getNonce(c.msg.sender)
result = generateAddress(c.msg.sender, creationNonce)
else:
result = generateSafeAddress(c.msg.sender, salt, c.msg.data)
# ------------------------------------------------------------------------------
# Public functions
# ------------------------------------------------------------------------------
template getCoinbase*(c: Computation): EthAddress =
when evmc_enabled:
c.host.getTxContext().block_coinbase
else:
c.vmState.coinbase
template getTimestamp*(c: Computation): uint64 =
when evmc_enabled:
# TODO:
# while the choice of using int64 in evmc will not affect
# normal evm/evmc operations.
# the reason why cast[uint64] is being used here because
# some of the tests will fail if the value from test vector overflow
# see setupTxContext of host_services.nim too
# block timestamp overflow should be checked before entering EVM
cast[uint64](c.host.getTxContext().block_timestamp)
else:
c.vmState.blockCtx.timestamp.uint64
template getBlockNumber*(c: Computation): UInt256 =
when evmc_enabled:
c.host.getBlockNumber().u256
else:
c.vmState.blockNumber.u256
template getDifficulty*(c: Computation): DifficultyInt =
when evmc_enabled:
UInt256.fromEvmc c.host.getTxContext().block_prev_randao
else:
c.vmState.difficultyOrPrevRandao
template getGasLimit*(c: Computation): GasInt =
when evmc_enabled:
c.host.getTxContext().block_gas_limit.GasInt
else:
c.vmState.blockCtx.gasLimit
template getBaseFee*(c: Computation): UInt256 =
when evmc_enabled:
UInt256.fromEvmc c.host.getTxContext().block_base_fee
else:
c.vmState.blockCtx.baseFeePerGas.get(0.u256)
template getChainId*(c: Computation): uint64 =
when evmc_enabled:
c.host.getChainId()
else:
c.vmState.com.chainId.uint64
template getOrigin*(c: Computation): EthAddress =
when evmc_enabled:
c.host.getTxContext().tx_origin
else:
c.vmState.txCtx.origin
template getGasPrice*(c: Computation): GasInt =
when evmc_enabled:
UInt256.fromEvmc(c.host.getTxContext().tx_gas_price).truncate(GasInt)
else:
c.vmState.txCtx.gasPrice
template getVersionedHash*(c: Computation, index: int): VersionedHash =
when evmc_enabled:
cast[ptr UncheckedArray[VersionedHash]](c.host.getTxContext().blob_hashes)[index]
else:
c.vmState.txCtx.versionedHashes[index]
template getVersionedHashesLen*(c: Computation): int =
when evmc_enabled:
c.host.getTxContext().blob_hashes_count.int
else:
c.vmState.txCtx.versionedHashes.len
template getBlobBaseFee*(c: Computation): UInt256 =
when evmc_enabled:
UInt256.fromEvmc c.host.getTxContext().blob_base_fee
else:
c.vmState.txCtx.blobBaseFee
proc getBlockHash*(c: Computation, number: BlockNumber): Hash256 =
when evmc_enabled:
let
blockNumber = BlockNumber c.host.getTxContext().block_number
ancestorDepth = blockNumber - number - 1
if ancestorDepth >= constants.MAX_PREV_HEADER_DEPTH:
return Hash256()
if number >= blockNumber:
return Hash256()
c.host.getBlockHash(number)
else:
let
blockNumber = c.vmState.blockNumber
ancestorDepth = blockNumber - number - 1
if ancestorDepth >= constants.MAX_PREV_HEADER_DEPTH:
return Hash256()
if number >= blockNumber:
return Hash256()
c.vmState.getAncestorHash(number)
template accountExists*(c: Computation, address: EthAddress): bool =
when evmc_enabled:
c.host.accountExists(address)
else:
if c.fork >= FkSpurious:
not c.vmState.readOnlyStateDB.isDeadAccount(address)
else:
c.vmState.readOnlyStateDB.accountExists(address)
template getStorage*(c: Computation, slot: UInt256): UInt256 =
when evmc_enabled:
c.host.getStorage(c.msg.contractAddress, slot)
else:
c.vmState.readOnlyStateDB.getStorage(c.msg.contractAddress, slot)
template getBalance*(c: Computation, address: EthAddress): UInt256 =
when evmc_enabled:
c.host.getBalance(address)
else:
c.vmState.readOnlyStateDB.getBalance(address)
template getCodeSize*(c: Computation, address: EthAddress): uint =
when evmc_enabled:
c.host.getCodeSize(address)
else:
uint(c.vmState.readOnlyStateDB.getCodeSize(address))
template getCodeHash*(c: Computation, address: EthAddress): Hash256 =
when evmc_enabled:
c.host.getCodeHash(address)
else:
let
db = c.vmState.readOnlyStateDB
if not db.accountExists(address) or db.isEmptyAccount(address):
default(Hash256)
else:
db.getCodeHash(address)
template selfDestruct*(c: Computation, address: EthAddress) =
when evmc_enabled:
c.host.selfDestruct(c.msg.contractAddress, address)
else:
c.execSelfDestruct(address)
template getCode*(c: Computation, address: EthAddress): seq[byte] =
when evmc_enabled:
c.host.copyCode(address)
else:
c.vmState.readOnlyStateDB.getCode(address)
template setTransientStorage*(c: Computation, slot, val: UInt256) =
when evmc_enabled:
c.host.setTransientStorage(c.msg.contractAddress, slot, val)
else:
c.vmState.stateDB.
setTransientStorage(c.msg.contractAddress, slot, val)
template getTransientStorage*(c: Computation, slot: UInt256): UInt256 =
when evmc_enabled:
c.host.getTransientStorage(c.msg.contractAddress, slot)
else:
c.vmState.readOnlyStateDB.
getTransientStorage(c.msg.contractAddress, slot)
proc newComputation*(vmState: BaseVMState, sysCall: bool, message: Message,
salt: ContractSalt = ZERO_CONTRACTSALT): Computation =
new result
result.vmState = vmState
result.msg = message
result.memory = EvmMemoryRef.new()
result.stack = EvmStackRef.new()
result.returnStack = @[]
result.gasMeter.init(message.gas)
result.sysCall = sysCall
if result.msg.isCreate():
result.msg.contractAddress = result.generateContractAddress(salt)
result.code = newCodeStream(message.data)
message.data = @[]
else:
result.code = newCodeStream(
vmState.readOnlyStateDB.getCode(message.codeAddress))
func newComputation*(vmState: BaseVMState, sysCall: bool,
message: Message, code: seq[byte]): Computation =
new result
result.vmState = vmState
result.msg = message
result.memory = EvmMemoryRef.new()
result.stack = EvmStackRef.new()
result.returnStack = @[]
result.gasMeter.init(message.gas)
result.code = newCodeStream(code)
result.sysCall = sysCall
template gasCosts*(c: Computation): untyped =
c.vmState.gasCosts
template fork*(c: Computation): untyped =
c.vmState.fork
template isSuccess*(c: Computation): bool =
c.error.isNil
template isError*(c: Computation): bool =
not c.isSuccess
func shouldBurnGas*(c: Computation): bool =
c.isError and c.error.burnsGas
proc snapshot*(c: Computation) =
c.savePoint = c.vmState.stateDB.beginSavepoint()
proc commit*(c: Computation) =
c.vmState.stateDB.commit(c.savePoint)
proc dispose*(c: Computation) =
c.vmState.stateDB.safeDispose(c.savePoint)
c.savePoint = nil
proc rollback*(c: Computation) =
c.vmState.stateDB.rollback(c.savePoint)
func setError*(c: Computation, msg: string, burnsGas = false) =
c.error = Error(evmcStatus: EVMC_FAILURE, info: msg, burnsGas: burnsGas)
func setError*(c: Computation, code: evmc_status_code, burnsGas = false) =
c.error = Error(evmcStatus: code, info: $code, burnsGas: burnsGas)
func setError*(
c: Computation, code: evmc_status_code, msg: string, burnsGas = false) =
c.error = Error(evmcStatus: code, info: msg, burnsGas: burnsGas)
func evmcStatus*(c: Computation): evmc_status_code =
if c.isSuccess:
EVMC_SUCCESS
else:
c.error.evmcStatus
func errorOpt*(c: Computation): Opt[string] =
if c.isSuccess:
return Opt.none(string)
if c.error.evmcStatus == EVMC_REVERT:
return Opt.none(string)
Opt.some(c.error.info)
proc writeContract*(c: Computation) =
template withExtra(tracer: untyped, args: varargs[untyped]) =
tracer args, newContract=($c.msg.contractAddress),
blockNumber=c.vmState.blockNumber,
parentHash=($c.vmState.parent.blockHash)
# In each check below, they are guarded by `len > 0`. This includes writing
# out the code, because the account already has zero-length code to handle
# nested calls (this is specified). May as well simplify other branches.
let (len, fork) = (c.output.len, c.fork)
if len == 0:
return
# EIP-3541 constraint (https://eips.ethereum.org/EIPS/eip-3541).
if fork >= FkLondon and c.output[0] == 0xEF.byte:
withExtra trace, "New contract code starts with 0xEF byte, not allowed by EIP-3541"
c.setError(EVMC_CONTRACT_VALIDATION_FAILURE, true)
return
# EIP-170 constraint (https://eips.ethereum.org/EIPS/eip-3541).
if fork >= FkSpurious and len > EIP170_MAX_CODE_SIZE:
withExtra trace, "New contract code exceeds EIP-170 limit",
codeSize=len, maxSize=EIP170_MAX_CODE_SIZE
c.setError(EVMC_OUT_OF_GAS, true)
return
# Charge gas and write the code even if the code address is self-destructed.
# Non-empty code in a newly created, self-destructed account is possible if
# the init code calls `DELEGATECALL` or `CALLCODE` to other code which uses
# `SELFDESTRUCT`. This shows on Mainnet blocks 6001128..6001204, where the
# gas difference matters. The new code can be called later in the
# transaction too, before self-destruction wipes the account at the end.
let
gasParams = GasParams(kind: Create, cr_memLength: len)
res = c.gasCosts[Create].cr_handler(0.u256, gasParams)
codeCost = res.gasCost
if codeCost <= c.gasMeter.gasRemaining:
c.gasMeter.consumeGas(codeCost,
reason = "Write new contract code").
expect("enough gas since we checked against gasRemaining")
c.vmState.mutateStateDB:
db.setCode(c.msg.contractAddress, c.output)
withExtra trace, "Writing new contract code"
return
if fork >= FkHomestead:
# EIP-2 (https://eips.ethereum.org/EIPS/eip-2).
c.setError(EVMC_OUT_OF_GAS, true)
else:
# Before EIP-2, when out of gas for code storage, the account ends up with
# zero-length code and no error. No gas is charged. Code cited in EIP-2:
# https://github.com/ethereum/pyethereum/blob/d117c8f3fd93/ethereum/processblock.py#L304
# https://github.com/ethereum/go-ethereum/blob/401354976bb4/core/vm/instructions.go#L586
# The account already has zero-length code to handle nested calls.
withExtra trace, "New contract given empty code by pre-Homestead rules"
template chainTo*(c: Computation,
toChild: typeof(c.child),
after: untyped) =
c.child = toChild
c.continuation = proc(): EvmResultVoid {.gcsafe, raises: [].} =
c.continuation = nil
after
func merge*(c, child: Computation) =
c.gasMeter.refundGas(child.gasMeter.gasRefunded)
proc execSelfDestruct*(c: Computation, beneficiary: EthAddress) =
c.vmState.mutateStateDB:
let localBalance = c.getBalance(c.msg.contractAddress)
# Register the account to be deleted
if c.fork >= FkCancun:
# Zeroing contract balance except beneficiary
# is the same address
db.subBalance(c.msg.contractAddress, localBalance)
# Transfer to beneficiary
db.addBalance(beneficiary, localBalance)
db.selfDestruct6780(c.msg.contractAddress)
else:
# Transfer to beneficiary
db.addBalance(beneficiary, localBalance)
db.selfDestruct(c.msg.contractAddress)
trace "SELFDESTRUCT",
contractAddress = c.msg.contractAddress.toHex,
localBalance = localBalance.toString,
beneficiary = beneficiary.toHex
func addLogEntry*(c: Computation, log: Log) =
c.vmState.stateDB.addLogEntry(log)
# some gasRefunded operations still relying
# on negative number
func getGasRefund*(c: Computation): GasInt =
if c.isSuccess:
result = c.gasMeter.gasRefunded
func refundSelfDestruct*(c: Computation) =
let cost = gasFees[c.fork][RefundSelfDestruct]
let num = c.vmState.stateDB.selfDestructLen
c.gasMeter.refundGas(cost * num)
func tracingEnabled*(c: Computation): bool =
c.vmState.tracingEnabled
func traceOpCodeStarted*(c: Computation, op: Op): int {.raises: [].} =
c.vmState.captureOpStart(
c,
c.code.pc - 1,
op,
c.gasMeter.gasRemaining,
c.msg.depth + 1)
func traceOpCodeEnded*(c: Computation, op: Op, opIndex: int) {.raises: [].} =
c.vmState.captureOpEnd(
c,
c.code.pc - 1,
op,
c.gasMeter.gasRemaining,
c.gasMeter.gasRefunded,
c.returnData,
c.msg.depth + 1,
opIndex)
func traceError*(c: Computation) {.raises: [].} =
c.vmState.captureFault(
c,
c.code.pc - 1,
c.instr,
c.gasMeter.gasRemaining,
c.gasMeter.gasRefunded,
c.returnData,
c.msg.depth + 1,
c.errorOpt)
func prepareTracer*(c: Computation) =
c.vmState.capturePrepare(c, c.msg.depth)
func opcodeGastCost*(
c: Computation, op: Op, gasCost: GasInt, reason: string): EvmResultVoid
{.raises: [].} =
c.vmState.captureGasCost(
c,
op,
gasCost,
c.gasMeter.gasRemaining,
c.msg.depth + 1)
c.gasMeter.consumeGas(gasCost, reason)
# ------------------------------------------------------------------------------
# End
# ------------------------------------------------------------------------------
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