# Nimbus # Copyright (c) 2018 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. ## EVM Opcode Handlers: Create Operations ## ====================================== ## {.push raises: [CatchableError].} # basically the annotation type of a `Vm2OpFn` import ../../../constants, ../../../errors, ../../../common/evmforks, ../../../utils/utils, ../../computation, ../../memory, ../../stack, ../../types, ../gas_costs, ../gas_meter, ../op_codes, ../utils/utils_numeric, ./oph_defs, ./oph_helpers, chronicles, eth/common, eth/common/eth_types, stint, strformat when not defined(evmc_enabled): import ../../state, ../../../db/accounts_cache # ------------------------------------------------------------------------------ # Private helpers # ------------------------------------------------------------------------------ when evmc_enabled: template execSubCreate(c: Computation; msg: ref nimbus_message) = c.chainTo(msg): c.gasMeter.returnGas(c.res.gas_left) if c.res.status_code == EVMC_SUCCESS: c.stack.top(c.res.create_address) elif c.res.status_code == EVMC_REVERT: # From create, only use `outputData` if child returned with `REVERT`. c.returnData = @(makeOpenArray(c.res.outputData, c.res.outputSize.int)) if not c.res.release.isNil: c.res.release(c.res) else: proc execSubCreate(c: Computation; childMsg: Message; salt: ContractSalt = ZERO_CONTRACTSALT) = ## Create new VM -- helper for `Create`-like operations # need to provide explicit and for capturing in chainTo proc() var child = newComputation(c.vmState, childMsg, salt) c.chainTo(child): if not child.shouldBurnGas: c.gasMeter.returnGas(child.gasMeter.gasRemaining) if child.isSuccess: c.merge(child) c.stack.top child.msg.contractAddress elif not child.error.burnsGas: # Means return was `REVERT`. # From create, only use `outputData` if child returned with `REVERT`. c.returnData = child.output # ------------------------------------------------------------------------------ # Private, op handlers implementation # ------------------------------------------------------------------------------ const createOp: Vm2OpFn = proc(k: var Vm2Ctx) = ## 0xf0, Create a new account with associated code checkInStaticContext(k.cpt) let cpt = k.cpt endowment = cpt.stack.popInt() memPos = cpt.stack.popInt().safeInt memLen = cpt.stack.peekInt().safeInt cpt.stack.top(0) # EIP-3860 if cpt.fork >= FkShanghai and memLen > EIP3860_MAX_INITCODE_SIZE: trace "Initcode size exceeds maximum", initcodeSize = memLen raise newException(InitcodeError, &"CREATE: have {memLen}, max {EIP3860_MAX_INITCODE_SIZE}") let gasParams = GasParams( kind: Create, cr_currentMemSize: cpt.memory.len, cr_memOffset: memPos, cr_memLength: memLen) let gasCost = cpt.gasCosts[Create].c_handler(1.u256, gasParams).gasCost cpt.opcodeGastCost(Create, gasCost, reason = &"CREATE: GasCreate + {memLen} * memory expansion") cpt.memory.extend(memPos, memLen) cpt.returnData.setLen(0) if cpt.msg.depth >= MaxCallDepth: debug "Computation Failure", reason = "Stack too deep", maxDepth = MaxCallDepth, depth = cpt.msg.depth return if endowment != 0: let senderBalance = cpt.getBalance(cpt.msg.contractAddress) if senderBalance < endowment: debug "Computation Failure", reason = "Insufficient funds available to transfer", required = endowment, balance = senderBalance return var createMsgGas = cpt.gasMeter.gasRemaining if cpt.fork >= FkTangerine: createMsgGas -= createMsgGas div 64 cpt.gasMeter.consumeGas(createMsgGas, reason = "CREATE msg gas") when evmc_enabled: let msg = new(nimbus_message) c = cpt msg[] = nimbus_message( kind: EVMC_CREATE, depth: (cpt.msg.depth + 1).int32, gas: createMsgGas, sender: cpt.msg.contractAddress, input_data: cpt.memory.readPtr(memPos), input_size: memLen.uint, value: toEvmc(endowment), create2_salt: toEvmc(ZERO_CONTRACTSALT), ) c.execSubCreate(msg) else: cpt.execSubCreate( childMsg = Message( kind: EVMC_CREATE, depth: cpt.msg.depth + 1, gas: createMsgGas, sender: cpt.msg.contractAddress, value: endowment, data: cpt.memory.read(memPos, memLen))) # --------------------- create2Op: Vm2OpFn = proc(k: var Vm2Ctx) = ## 0xf5, Behaves identically to CREATE, except using keccak256 checkInStaticContext(k.cpt) let cpt = k.cpt endowment = cpt.stack.popInt() memPos = cpt.stack.popInt().safeInt memLen = cpt.stack.popInt().safeInt salt = ContractSalt(bytes: cpt.stack.peekInt().toBytesBE) cpt.stack.top(0) # EIP-3860 if cpt.fork >= FkShanghai and memLen > EIP3860_MAX_INITCODE_SIZE: trace "Initcode size exceeds maximum", initcodeSize = memLen raise newException(InitcodeError, &"CREATE2: have {memLen}, max {EIP3860_MAX_INITCODE_SIZE}") let gasParams = GasParams( kind: Create, cr_currentMemSize: cpt.memory.len, cr_memOffset: memPos, cr_memLength: memLen) var gasCost = cpt.gasCosts[Create].c_handler(1.u256, gasParams).gasCost gasCost = gasCost + cpt.gasCosts[Create2].m_handler(0, 0, memLen) cpt.opcodeGastCost(Create2, gasCost, reason = &"CREATE2: GasCreate + {memLen} * memory expansion") cpt.memory.extend(memPos, memLen) cpt.returnData.setLen(0) if cpt.msg.depth >= MaxCallDepth: debug "Computation Failure", reason = "Stack too deep", maxDepth = MaxCallDepth, depth = cpt.msg.depth return if endowment != 0: let senderBalance = cpt.getBalance(cpt.msg.contractAddress) if senderBalance < endowment: debug "Computation Failure", reason = "Insufficient funds available to transfer", required = endowment, balance = senderBalance return var createMsgGas = cpt.gasMeter.gasRemaining if cpt.fork >= FkTangerine: createMsgGas -= createMsgGas div 64 cpt.gasMeter.consumeGas(createMsgGas, reason = "CREATE2 msg gas") when evmc_enabled: let msg = new(nimbus_message) c = cpt msg[] = nimbus_message( kind: EVMC_CREATE2, depth: (cpt.msg.depth + 1).int32, gas: createMsgGas, sender: cpt.msg.contractAddress, input_data: cpt.memory.readPtr(memPos), input_size: memLen.uint, value: toEvmc(endowment), create2_salt: toEvmc(salt), ) c.execSubCreate(msg) else: cpt.execSubCreate( salt = salt, childMsg = Message( kind: EVMC_CREATE2, depth: cpt.msg.depth + 1, gas: createMsgGas, sender: cpt.msg.contractAddress, value: endowment, data: cpt.memory.read(memPos, memLen))) # ------------------------------------------------------------------------------ # Public, op exec table entries # ------------------------------------------------------------------------------ const vm2OpExecCreate*: seq[Vm2OpExec] = @[ (opCode: Create, ## 0xf0, Create a new account with associated code forks: Vm2OpAllForks, name: "create", info: "Create a new account with associated code", exec: (prep: vm2OpIgnore, run: createOp, post: vm2OpIgnore)), (opCode: Create2, ## 0xf5, Create using keccak256 forks: Vm2OpConstantinopleAndLater, name: "create2", info: "Behaves identically to CREATE, except using keccak256", exec: (prep: vm2OpIgnore, run: create2Op, post: vm2OpIgnore))] # ------------------------------------------------------------------------------ # End # ------------------------------------------------------------------------------