284 lines
10 KiB
Nim
284 lines
10 KiB
Nim
# Nimbus
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# Copyright (c) 2019 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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proc hostReleaseResultImpl(res: var nimbus_result) {.cdecl, gcsafe.} =
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dealloc(res.output_data)
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proc hostGetTxContextImpl(ctx: Computation): nimbus_tx_context {.cdecl.} =
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let vmstate = ctx.vmState
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result.tx_gas_price = toEvmc(vmstate.txGasPrice.u256)
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result.tx_origin = vmstate.txOrigin
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result.block_coinbase = vmstate.coinbase
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result.block_number = vmstate.blockNumber.truncate(int64)
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result.block_timestamp = vmstate.timestamp.toUnix()
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result.block_gas_limit = int64(vmstate.gasLimit)
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result.block_difficulty = toEvmc(vmstate.difficulty)
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result.chain_id = toEvmc(vmstate.chaindb.config.chainId.uint.u256)
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result.block_base_fee = toEvmc(vmstate.baseFee)
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proc hostGetBlockHashImpl(ctx: Computation, number: int64): Hash256 {.cdecl.} =
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ctx.vmState.getAncestorHash(number.u256)
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proc hostAccountExistsImpl(ctx: Computation, address: EthAddress): bool {.cdecl.} =
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let db = ctx.vmState.readOnlyStateDB
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if ctx.fork >= FkSpurious:
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not db.isDeadAccount(address)
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else:
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db.accountExists(address)
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proc hostGetStorageImpl(ctx: Computation, address: EthAddress, key: var evmc_bytes32): evmc_bytes32 {.cdecl.} =
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ctx.vmState.stateDB.getStorage(address, Uint256.fromEvmc(key)).toEvmc()
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proc sstoreNetGasMetering(ctx: Computation): bool {.inline.} =
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ctx.fork in {FkConstantinople, FkIstanbul, FkBerlin, FkLondon}
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proc hostSetStorageImpl(ctx: Computation, address: EthAddress,
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key, value: var evmc_bytes32): evmc_storage_status {.cdecl.} =
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let
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slot = Uint256.fromEvmc(key)
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newValue = Uint256.fromEvmc(value)
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statedb = ctx.vmState.readOnlyStateDb
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currValue = statedb.getStorage(address, slot)
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assert address == ctx.msg.contractAddress
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var
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status = EVMC_STORAGE_MODIFIED
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gasRefund = 0.GasInt
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origValue = 0.u256
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if newValue == currValue:
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status = EVMC_STORAGE_UNCHANGED
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else:
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origValue = statedb.getCommittedStorage(address, slot)
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if origValue == currValue or not ctx.sstoreNetGasMetering():
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if currValue == 0:
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status = EVMC_STORAGE_ADDED
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elif newValue == 0:
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status = EVMC_STORAGE_DELETED
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else:
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status = EVMC_STORAGE_MODIFIED_AGAIN
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ctx.vmState.mutateStateDB:
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db.setStorage(address, slot, newValue)
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let gasParam = GasParams(kind: Op.Sstore,
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s_status: status,
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s_currentValue: currValue,
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s_originalValue: origValue
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)
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gasRefund = ctx.gasCosts[Sstore].c_handler(newValue, gasParam)[1]
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if gasRefund != 0:
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ctx.gasMeter.refundGas(gasRefund)
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result = status
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proc hostGetBalanceImpl(ctx: Computation, address: EthAddress): evmc_bytes32 {.cdecl.} =
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ctx.vmState.readOnlyStateDB.getBalance(address).toEvmc()
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proc hostGetCodeSizeImpl(ctx: Computation, address: EthAddress): uint {.cdecl.} =
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ctx.vmState.readOnlyStateDB.getCode(address).len.uint
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proc hostGetCodeHashImpl(ctx: Computation, address: EthAddress): Hash256 {.cdecl.} =
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let db = ctx.vmstate.readOnlyStateDB
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if not db.accountExists(address):
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return
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if db.isEmptyAccount(address):
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return
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db.getCodeHash(address)
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proc hostCopyCodeImpl(ctx: Computation, address: EthAddress,
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codeOffset: int, bufferData: ptr byte,
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bufferSize: int): int {.cdecl.} =
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var code = ctx.vmState.readOnlyStateDB.getCode(address)
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# Handle "big offset" edge case.
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if codeOffset > code.len:
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return 0
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let maxToCopy = code.len - codeOffset
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let numToCopy = min(maxToCopy, bufferSize)
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if numToCopy > 0:
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copyMem(bufferData, code[codeOffset].addr, numToCopy)
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result = numToCopy
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proc hostSelfdestructImpl(ctx: Computation, address, beneficiary: EthAddress) {.cdecl.} =
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assert address == ctx.msg.contractAddress
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ctx.execSelfDestruct(beneficiary)
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proc hostEmitLogImpl(ctx: Computation, address: EthAddress,
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data: ptr byte, dataSize: int,
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topics: UncheckedArray[evmc_bytes32], topicsCount: int) {.cdecl.} =
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var log: Log
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if topicsCount > 0:
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log.topics = newSeq[Topic](topicsCount)
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for i in 0 ..< topicsCount:
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log.topics[i] = topics[i].bytes
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log.data = @(makeOpenArray(data, dataSize))
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log.address = address
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ctx.addLogEntry(log)
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proc hostAccessAccountImpl(ctx: Computation, address: EthAddress): evmc_access_status {.cdecl.} =
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ctx.vmState.mutateStateDB:
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if not db.inAccessList(address):
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db.accessList(address)
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return EVMC_ACCESS_COLD
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else:
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return EVMC_ACCESS_WARM
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proc hostAccessStorageImpl(ctx: Computation, address: EthAddress,
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key: var evmc_bytes32): evmc_access_status {.cdecl.} =
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let slot = Uint256.fromEvmc(key)
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ctx.vmState.mutateStateDB:
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if not db.inAccessList(address, slot):
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db.accessList(address, slot)
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return EVMC_ACCESS_COLD
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else:
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return EVMC_ACCESS_WARM
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proc enterCreateImpl(c: Computation, m: nimbus_message): Computation =
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# TODO: use evmc_message to evoid copy
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let childMsg = Message(
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kind: CallKind(m.kind),
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depth: m.depth,
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gas: m.gas,
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sender: m.sender,
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value: Uint256.fromEvmc(m.value),
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data: @(makeOpenArray(m.inputData, m.inputSize.int))
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)
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return newComputation(c.vmState, childMsg,
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ContractSalt.fromEvmc(m.create2_salt))
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template leaveCreateImpl(c, child: Computation, res: nimbus_result) =
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if not child.shouldBurnGas:
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res.gas_left = child.gasMeter.gasRemaining
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if child.isSuccess:
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c.merge(child)
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res.status_code = EVMC_SUCCESS
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res.create_address = child.msg.contractAddress
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else:
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res.status_code = if child.shouldBurnGas: EVMC_FAILURE else: EVMC_REVERT
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if child.output.len > 0:
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# TODO: can we move the ownership of seq to raw pointer?
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res.output_size = child.output.len.uint
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res.output_data = cast[ptr byte](alloc(child.output.len))
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copyMem(res.output_data, child.output[0].addr, child.output.len)
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res.release = hostReleaseResultImpl
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template enterCallImpl(c: Computation, m: nimbus_message): Computation =
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let childMsg = Message(
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kind: CallKind(m.kind),
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depth: m.depth,
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gas: m.gas,
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sender: m.sender,
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codeAddress: m.destination,
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contractAddress: if m.kind == EVMC_CALL: m.destination else: c.msg.contractAddress,
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value: Uint256.fromEvmc(m.value),
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data: @(makeOpenArray(m.inputData, m.inputSize.int)),
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flags: MsgFlags(m.flags)
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)
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newComputation(c.vmState, childMsg)
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template leaveCallImpl(c, child: Computation, res: nimbus_result) =
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if not child.shouldBurnGas:
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res.gas_left = child.gasMeter.gasRemaining
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if child.isSuccess:
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c.merge(child)
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res.status_code = EVMC_SUCCESS
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else:
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res.status_code = if child.shouldBurnGas: EVMC_FAILURE else: EVMC_REVERT
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if child.output.len > 0:
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# TODO: can we move the ownership of seq to raw pointer?
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res.output_size = child.output.len.uint
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res.output_data = cast[ptr byte](alloc(child.output.len))
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copyMem(res.output_data, child.output[0].addr, child.output.len)
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res.release = hostReleaseResultImpl
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proc enterHostCall(c: Computation, msg: var nimbus_message): Computation {.noinline.} =
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if msg.kind == EVMC_CREATE or msg.kind == EVMC_CREATE2:
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enterCreateImpl(c, msg)
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else:
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enterCallImpl(c, msg)
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proc leaveHostCall(c, child: Computation, kind: evmc_call_kind): nimbus_result {.noinline.} =
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if kind == EVMC_CREATE or kind == EVMC_CREATE2:
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leaveCreateImpl(c, child, result)
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else:
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leaveCallImpl(c, child, result)
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proc hostCallImpl(ctx: Computation, msg: var nimbus_message): nimbus_result {.cdecl.} =
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let child = enterHostCall(ctx, msg)
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child.execCallOrCreate()
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leaveHostCall(ctx, child, msg.kind)
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proc initHostInterface(): evmc_host_interface =
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result.account_exists = cast[evmc_account_exists_fn](hostAccountExistsImpl)
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result.get_storage = cast[evmc_get_storage_fn](hostGetStorageImpl)
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result.set_storage = cast[evmc_set_storage_fn](hostSetStorageImpl)
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result.get_balance = cast[evmc_get_balance_fn](hostGetBalanceImpl)
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result.get_code_size = cast[evmc_get_code_size_fn](hostGetCodeSizeImpl)
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result.get_code_hash = cast[evmc_get_code_hash_fn](hostGetCodeHashImpl)
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result.copy_code = cast[evmc_copy_code_fn](hostCopyCodeImpl)
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result.selfdestruct = cast[evmc_selfdestruct_fn](hostSelfdestructImpl)
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result.call = cast[evmc_call_fn](hostCallImpl)
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result.get_tx_context = cast[evmc_get_tx_context_fn](hostGetTxContextImpl)
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result.get_block_hash = cast[evmc_get_block_hash_fn](hostGetBlockHashImpl)
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result.emit_log = cast[evmc_emit_log_fn](hostEmitLogImpl)
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result.access_account = cast[evmc_access_account_fn](hostAccessAccountImpl)
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result.access_storage = cast[evmc_access_storage_fn](hostAccessStorageImpl)
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proc vmSetOptionImpl(vm: ptr evmc_vm, name, value: cstring): evmc_set_option_result {.cdecl.} =
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return EVMC_SET_OPTION_INVALID_NAME
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proc vmExecuteImpl(vm: ptr evmc_vm, host: ptr evmc_host_interface,
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ctx: Computation, rev: evmc_revision,
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msg: evmc_message, code: ptr byte, code_size: uint): evmc_result {.cdecl.} =
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discard
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proc vmGetCapabilitiesImpl(vm: ptr evmc_vm): evmc_capabilities {.cdecl.} =
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result.incl(EVMC_CAPABILITY_EVM1)
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proc vmDestroyImpl(vm: ptr evmc_vm) {.cdecl.} =
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dealloc(vm)
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const
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EVMC_HOST_NAME = "nimbus_vm"
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EVMC_VM_VERSION = "0.0.1"
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proc init(vm: var evmc_vm) =
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vm.abi_version = EVMC_ABI_VERSION
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vm.name = EVMC_HOST_NAME
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vm.version = EVMC_VM_VERSION
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vm.destroy = vmDestroyImpl
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vm.execute = cast[evmc_execute_fn](vmExecuteImpl)
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vm.get_capabilities = vmGetCapabilitiesImpl
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vm.set_option = vmSetOptionImpl
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let gHost = initHostInterface()
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proc nim_host_get_interface(): ptr nimbus_host_interface {.exportc, cdecl.} =
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result = cast[ptr nimbus_host_interface](gHost.unsafeAddr)
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proc nim_host_create_context(vmstate: BaseVmState, msg: ptr evmc_message): Computation {.exportc, cdecl.} =
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#result = HostContext(
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# vmState: vmstate,
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# gasPrice: GasInt(gasPrice),
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# origin: fromEvmc(origin)
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#)
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GC_ref(result)
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proc nim_host_destroy_context(ctx: Computation) {.exportc, cdecl.} =
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GC_unref(ctx)
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proc nim_create_nimbus_vm(): ptr evmc_vm {.exportc, cdecl.} =
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result = create(evmc_vm)
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init(result[])
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