278 lines
10 KiB
Nim
278 lines
10 KiB
Nim
# Nimbus - Common entry point to the EVM from all different callers
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#
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# Copyright (c) 2018-2021 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 http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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import
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eth/common/eth_types, stint, options, stew/ranges/ptr_arith,
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chronos,
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".."/[vm_types, vm_state, vm_computation, vm_state_transactions],
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".."/[vm_internals, vm_precompiles, vm_gas_costs],
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".."/[db/accounts_cache],
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../common/evmforks,
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./host_types
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when defined(evmc_enabled):
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import ../utils/utils
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import ./host_services
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type
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# Standard call parameters.
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CallParams* = object
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vmState*: BaseVMState # Chain, database, state, block, fork.
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forkOverride*: Option[EVMFork] # Default fork is usually correct.
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origin*: Option[HostAddress] # Default origin is `sender`.
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gasPrice*: GasInt # Gas price for this call.
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gasLimit*: GasInt # Maximum gas available for this call.
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sender*: HostAddress # Sender account.
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to*: HostAddress # Recipient (ignored when `isCreate`).
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isCreate*: bool # True if this is a contract creation.
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value*: HostValue # Value sent from sender to recipient.
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input*: seq[byte] # Input data.
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accessList*: AccessList # EIP-2930 (Berlin) tx access list.
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noIntrinsic*: bool # Don't charge intrinsic gas.
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noAccessList*: bool # Don't initialise EIP-2929 access list.
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noGasCharge*: bool # Don't charge sender account for gas.
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noRefund*: bool # Don't apply gas refund/burn rule.
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# Standard call result. (Some fields are beyond what EVMC can return,
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# and must only be used from tests because they will not always be set).
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CallResult* = object
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isError*: bool # True if the call failed.
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gasUsed*: GasInt # Gas used by the call.
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contractAddress*: EthAddress # Created account (when `isCreate`).
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output*: seq[byte] # Output data.
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logEntries*: seq[Log] # Output logs.
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stack*: Stack # EVM stack on return (for test only).
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memory*: Memory # EVM memory on return (for test only).
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proc hostToComputationMessage*(msg: EvmcMessage): Message =
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Message(
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kind: CallKind(msg.kind),
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depth: msg.depth,
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gas: msg.gas,
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sender: msg.sender.fromEvmc,
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contractAddress: msg.recipient.fromEvmc,
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codeAddress: msg.code_address.fromEvmc,
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value: msg.value.fromEvmc,
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# When input size is zero, input data pointer may be null.
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data: if msg.input_size <= 0: @[]
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else: @(makeOpenArray(msg.input_data, msg.input_size.int)),
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flags: if msg.isStatic: emvcStatic else: emvcNoFlags
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)
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func intrinsicGas*(call: CallParams, fork: EVMFork): GasInt {.inline.} =
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# Compute the baseline gas cost for this transaction. This is the amount
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# of gas needed to send this transaction (but that is not actually used
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# for computation).
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var gas = gasFees[fork][GasTransaction]
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# EIP-2 (Homestead) extra intrinsic gas for contract creations.
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if call.isCreate:
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gas += gasFees[fork][GasTXCreate]
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# Input data cost, reduced in EIP-2028 (Istanbul).
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let gasZero = gasFees[fork][GasTXDataZero]
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let gasNonZero = gasFees[fork][GasTXDataNonZero]
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for b in call.input:
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gas += (if b == 0: gasZero else: gasNonZero)
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# EIP-2930 (Berlin) intrinsic gas for transaction access list.
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if fork >= FkBerlin:
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for account in call.accessList:
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gas += ACCESS_LIST_ADDRESS_COST
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gas += account.storageKeys.len * ACCESS_LIST_STORAGE_KEY_COST
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return gas
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proc initialAccessListEIP2929(call: CallParams) =
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# EIP2929 initial access list.
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let vmState = call.vmState
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if vmState.fork < FkBerlin:
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return
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vmState.mutateStateDB:
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db.accessList(call.sender)
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# For contract creations the EVM will add the contract address to the
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# access list itself, after calculating the new contract address.
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if not call.isCreate:
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db.accessList(call.to)
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# TODO: Check this only adds the correct subset of precompiles.
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for c in activePrecompiles():
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db.accessList(c)
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# EIP2930 optional access list.
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for account in call.accessList:
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db.accessList(account.address)
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for key in account.storageKeys:
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db.accessList(account.address, UInt256.fromBytesBE(key))
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proc setupHost(call: CallParams): TransactionHost =
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let vmState = call.vmState
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vmState.setupTxContext(
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origin = call.origin.get(call.sender),
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gasPrice = call.gasPrice,
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forkOverride = call.forkOverride
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)
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var intrinsicGas: GasInt = 0
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if not call.noIntrinsic:
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intrinsicGas = intrinsicGas(call, vmState.fork)
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let host = TransactionHost(
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vmState: vmState,
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msg: EvmcMessage(
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kind: if call.isCreate: EVMC_CREATE else: EVMC_CALL,
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# Default: flags: {},
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# Default: depth: 0,
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gas: call.gasLimit - intrinsicGas,
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recipient: call.to.toEvmc,
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code_address: call.to.toEvmc,
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sender: call.sender.toEvmc,
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value: call.value.toEvmc,
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)
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# All other defaults in `TransactionHost` are fine.
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)
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# Generate new contract address, prepare code, and update message `recipient`
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# with the contract address. This differs from the previous Nimbus EVM API.
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# Guarded under `evmc_enabled` for now so it doesn't break vm2.
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when defined(evmc_enabled):
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var code: seq[byte]
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if call.isCreate:
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let sender = call.sender
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let contractAddress =
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generateAddress(sender, call.vmState.readOnlyStateDB.getNonce(sender))
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host.msg.recipient = contractAddress.toEvmc
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host.msg.input_size = 0
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host.msg.input_data = nil
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code = call.input
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else:
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# TODO: Share the underlying data, but only after checking this does not
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# cause problems with the database.
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code = host.vmState.readOnlyStateDB.getCode(host.msg.code_address.fromEvmc)
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if call.input.len > 0:
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host.msg.input_size = call.input.len.csize_t
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# Must copy the data so the `host.msg.input_data` pointer
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# remains valid after the end of `call` lifetime.
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host.input = call.input
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host.msg.input_data = host.input[0].addr
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let cMsg = hostToComputationMessage(host.msg)
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host.computation = newComputation(vmState, cMsg, code)
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shallowCopy(host.code, code)
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else:
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if call.input.len > 0:
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host.msg.input_size = call.input.len.csize_t
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# Must copy the data so the `host.msg.input_data` pointer
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# remains valid after the end of `call` lifetime.
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host.input = call.input
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host.msg.input_data = host.input[0].addr
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let cMsg = hostToComputationMessage(host.msg)
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host.computation = newComputation(vmState, cMsg)
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return host
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when defined(evmc_enabled):
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import ./host_services
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proc doExecEvmc(host: TransactionHost, call: CallParams) =
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var callResult = evmcExecComputation(host)
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let c = host.computation
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if callResult.status_code == EVMC_SUCCESS:
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c.error = nil
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elif callResult.status_code == EVMC_REVERT:
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c.setError("EVMC_REVERT", false)
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else:
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c.setError($callResult.status_code, true)
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c.gasMeter.gasRemaining = callResult.gas_left
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c.msg.contractAddress = callResult.create_address.fromEvmc
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c.output = if callResult.output_size <= 0: @[]
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else: @(makeOpenArray(callResult.output_data,
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callResult.output_size.int))
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if not callResult.release.isNil:
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{.gcsafe.}:
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callResult.release(callResult)
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# FIXME-awkwardFactoring: the factoring out of the pre and
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# post parts feels awkward to me, but for now I'd really like
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# not to have too much duplicated code between sync and async.
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# --Adam
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proc prepareToRunComputation(host: TransactionHost, call: CallParams) =
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# Must come after `setupHost` for correct fork.
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if not call.noAccessList:
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initialAccessListEIP2929(call)
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# Charge for gas.
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if not call.noGasCharge:
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host.vmState.mutateStateDB:
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db.subBalance(call.sender, call.gasLimit.u256 * call.gasPrice.u256)
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proc calculateAndPossiblyRefundGas(host: TransactionHost, call: CallParams): GasInt =
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let c = host.computation
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# EIP-3529: Reduction in refunds
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let MaxRefundQuotient = if host.vmState.fork >= FkLondon:
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5.GasInt
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else:
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2.GasInt
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# Calculated gas used, taking into account refund rules.
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if call.noRefund:
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result = c.gasMeter.gasRemaining
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elif not c.shouldBurnGas:
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let maxRefund = (call.gasLimit - c.gasMeter.gasRemaining) div MaxRefundQuotient
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let refund = min(c.getGasRefund(), maxRefund)
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c.gasMeter.returnGas(refund)
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result = c.gasMeter.gasRemaining
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# Refund for unused gas.
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if result > 0 and not call.noGasCharge:
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host.vmState.mutateStateDB:
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db.addBalance(call.sender, result.u256 * call.gasPrice.u256)
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proc finishRunningComputation(host: TransactionHost, call: CallParams): CallResult =
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let c = host.computation
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let gasRemaining = calculateAndPossiblyRefundGas(host, call)
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result.isError = c.isError
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result.gasUsed = call.gasLimit - gasRemaining
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shallowCopy(result.output, c.output)
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result.contractAddress = if call.isCreate: c.msg.contractAddress
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else: default(HostAddress)
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shallowCopy(result.logEntries, c.logEntries)
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result.stack = c.stack
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result.memory = c.memory
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proc runComputation*(call: CallParams): CallResult =
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let host = setupHost(call)
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prepareToRunComputation(host, call)
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when defined(evmc_enabled):
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doExecEvmc(host, call)
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else:
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execComputation(host.computation)
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finishRunningComputation(host, call)
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# FIXME-duplicatedForAsync
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proc asyncRunComputation*(call: CallParams): Future[CallResult] {.async.} =
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let host = setupHost(call)
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prepareToRunComputation(host, call)
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# FIXME-asyncAndEvmc: I'm not sure what to do with EVMC at the moment.
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# when defined(evmc_enabled):
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# doExecEvmc(host, call)
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# else:
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await asyncExecComputation(host.computation)
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return finishRunningComputation(host, call)
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