574 lines
19 KiB
Nim
574 lines
19 KiB
Nim
# Nimbus
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# Copyright (c) 2018-2019 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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import
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strformat, times, sets, sequtils, options,
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chronicles, stint, nimcrypto, eth/common,
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./utils/[macros_procs_opcodes, v2utils_numeric],
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./gas_meter, ./v2gas_costs, ./v2opcode_values, ./v2forks,
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../v2memory, ../stack, ../code_stream, ../v2computation, ../v2state, ../v2types,
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../../errors, ../../constants,
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../../db/[db_chain, accounts_cache]
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# verify that experimental op table compiles
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import
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./op_handlers, ./op_handlers/oph_defs
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logScope:
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topics = "opcode impl"
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# ##################################
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# Syntactic sugar
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proc gasEip2929AccountCheck(c: Computation, address: EthAddress, prevCost = 0.GasInt) =
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c.vmState.mutateStateDB:
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let gasCost = if not db.inAccessList(address):
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db.accessList(address)
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ColdAccountAccessCost
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else:
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WarmStorageReadCost
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c.gasMeter.consumeGas(gasCost - prevCost, reason = "gasEIP2929AccountCheck")
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template push(x: typed) {.dirty.} =
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## Push an expression on the computation stack
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c.stack.push x
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proc writePaddedResult(mem: var Memory,
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data: openarray[byte],
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memPos, dataPos, len: Natural,
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paddingValue = 0.byte) =
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mem.extend(memPos, len)
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let dataEndPosition = dataPos.int64 + len - 1
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let sourceBytes = data[min(dataPos, data.len) .. min(data.len - 1, dataEndPosition)]
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mem.write(memPos, sourceBytes)
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# Don't duplicate zero-padding of mem.extend
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let paddingOffset = min(memPos + sourceBytes.len, mem.len)
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let numPaddingBytes = min(mem.len - paddingOffset, len - sourceBytes.len)
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if numPaddingBytes > 0:
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# TODO: avoid unnecessary memory allocation
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mem.write(paddingOffset, repeat(paddingValue, numPaddingBytes))
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template sstoreNetGasMeteringImpl(c: Computation, slot, newValue: Uint256) =
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let stateDB = c.vmState.readOnlyStateDB
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let currentValue {.inject.} = c.getStorage(slot)
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let
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gasParam = GasParams(
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kind: Op.Sstore,
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s_currentValue: currentValue,
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s_originalValue: stateDB.getCommittedStorage(c.msg.contractAddress, slot))
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(gasCost, gasRefund) = c.gasCosts[Sstore].c_handler(newValue, gasParam)
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c.gasMeter.consumeGas(gasCost, &"SSTORE EIP2200: {c.msg.contractAddress}[{slot}] -> {newValue} ({currentValue})")
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if gasRefund != 0:
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c.gasMeter.refundGas(gasRefund)
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c.vmState.mutateStateDB:
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db.setStorage(c.msg.contractAddress, slot, newValue)
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# ##################################
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# re-implemented OP handlers
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var gdbBPHook_counter = 0
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proc gdbBPHook*() =
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gdbBPHook_counter.inc
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stderr.write &"*** Hello {gdbBPHook_counter}\n"
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stderr.flushFile
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template opHandlerX(callName: untyped; opCode: Op; fork = FkBerlin) =
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proc callName*(c: Computation) =
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gdbBPHook()
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var desc: Vm2Ctx
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desc.cpt = c
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vm2OpHandlers[fork][opCode].exec.run(desc)
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template opHandler(callName: untyped; opCode: Op; fork = FkBerlin) =
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proc callName*(c: Computation) =
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var desc: Vm2Ctx
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desc.cpt = c
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vm2OpHandlers[fork][opCode].exec.run(desc)
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opHandler add, Op.Add
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opHandler mul, Op.Mul
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opHandler sub, Op.Sub
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opHandler divide, Op.Div
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opHandler sdiv, Op.Sdiv
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opHandler modulo, Op.Mod
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opHandler smod, Op.Smod
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opHandler addmod, Op.AddMod
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opHandler mulmod, Op.MulMod
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opHandler exp, Op.Exp
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opHandler signExtend, Op.SignExtend
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opHandler lt, Op.Lt
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opHandler gt, Op.Gt
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opHandler slt, Op.Slt
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opHandler sgt, Op.Sgt
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opHandler eq, Op.Eq
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opHandler isZero, Op.IsZero
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opHandler andOp, Op.And
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opHandler orOp, Op.Or
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opHandler xorOp, Op.Xor
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opHandler notOp, Op.Not
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opHandler byteOp, Op.Byte
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opHandler shlOp, Op.Shl
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opHandler shrOp, Op.Shr
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opHandler sarOp, Op.Sar
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opHandler sha3, Op.Sha3
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opHandler address, Op.Address
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opHandler balance, Op.Balance, FkFrontier
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opHandler balanceEIP2929, Op.Balance
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opHandler origin, Op.Origin
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opHandler caller, Op.Caller
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opHandler callValue, Op.CallValue
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opHandler callDataLoad, Op.CallDataLoad
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opHandler callDataSize, Op.CallDataSize
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opHandler callDataCopy, Op.CallDataCopy
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opHandler codeSize, Op.CodeSize
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opHandler codeCopy, Op.CodeCopy
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opHandler gasprice, Op.GasPrice
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opHandler extCodeSize, Op.ExtCodeSize, FkFrontier
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opHandler extCodeSizeEIP2929, Op.ExtCodeSize
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opHandler extCodeCopy, Op.ExtCodeCopy, FkFrontier
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opHandler extCodeCopyEIP2929, Op.ExtCodeCopy
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opHandler returnDataSize, Op.ReturnDataSize
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opHandler returnDataCopy, Op.ReturnDataCopy
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opHandler extCodeHash, Op.ExtCodeHash, FkFrontier
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opHandler extCodeHashEIP2929, Op.ExtCodeHash
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opHandler blockhash, Op.Blockhash
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opHandler coinbase, Op.Coinbase
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opHandler timestamp, Op.Timestamp
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opHandler blocknumber, Op.Number
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opHandler difficulty, Op.Difficulty
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opHandler gasLimit, Op.GasLimit
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opHandler chainId, Op.ChainId
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opHandler selfBalance, Op.SelfBalance
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opHandler pop, Op.Pop
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opHandler mload, Op.Mload
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opHandler mstore, Op.Mstore
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opHandler mstore8, Op.Mstore8
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opHandler sload, Op.Sload, FkFrontier
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opHandler sloadEIP2929, Op.Sload
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opHandler sstore, Op.Sstore, FkFrontier
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opHandler sstoreEIP1283, Op.Sstore, FkConstantinople
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opHandler sstoreEIP2200, Op.Sstore, FkIstanbul
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opHandler sstoreEIP2929, Op.Sstore
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opHandler jump, Op.Jump
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opHandler jumpI, Op.JumpI
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opHandler pc, Op.Pc
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opHandler msize, Op.Msize
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opHandler gas, Op.Gas
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opHandler jumpDest, Op.JumpDest
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opHandler beginSub, Op.BeginSub
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opHandler returnSub, Op.ReturnSub
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opHandler jumpSub, Op.JumpSub
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opHandler push1, Op.Push1
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opHandler push2, Op.Push2
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opHandler push3, Op.Push3
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opHandler push4, Op.Push4
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opHandler push5, Op.Push5
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opHandler push6, Op.Push6
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opHandler push7, Op.Push7
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opHandler push8, Op.Push8
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opHandler push9, Op.Push9
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opHandler push10, Op.Push10
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opHandler push11, Op.Push11
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opHandler push12, Op.Push12
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opHandler push13, Op.Push13
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opHandler push14, Op.Push14
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opHandler push15, Op.Push15
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opHandler push16, Op.Push16
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opHandler push17, Op.Push17
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opHandler push18, Op.Push18
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opHandler push19, Op.Push19
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opHandler push20, Op.Push20
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opHandler push21, Op.Push21
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opHandler push22, Op.Push22
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opHandler push23, Op.Push23
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opHandler push24, Op.Push24
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opHandler push25, Op.Push25
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opHandler push26, Op.Push26
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opHandler push27, Op.Push27
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opHandler push28, Op.Push28
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opHandler push29, Op.Push29
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opHandler push30, Op.Push30
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opHandler push31, Op.Push31
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opHandler push32, Op.Push32
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opHandler dup1, Op.Dup1
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opHandler dup2, Op.Dup2
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opHandler dup3, Op.Dup3
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opHandler dup4, Op.Dup4
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opHandler dup5, Op.Dup5
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opHandler dup6, Op.Dup6
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opHandler dup7, Op.Dup7
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opHandler dup8, Op.Dup8
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opHandler dup9, Op.Dup9
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opHandler dup10, Op.Dup10
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opHandler dup11, Op.Dup11
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opHandler dup12, Op.Dup12
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opHandler dup13, Op.Dup13
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opHandler dup14, Op.Dup14
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opHandler dup15, Op.Dup15
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opHandler dup16, Op.Dup16
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opHandler swap1, Op.Swap1
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opHandler swap2, Op.Swap2
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opHandler swap3, Op.Swap3
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opHandler swap4, Op.Swap4
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opHandler swap5, Op.Swap5
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opHandler swap6, Op.Swap6
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opHandler swap7, Op.Swap7
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opHandler swap8, Op.Swap8
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opHandler swap9, Op.Swap9
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opHandler swap10, Op.Swap10
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opHandler swap11, Op.Swap11
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opHandler swap12, Op.Swap12
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opHandler swap13, Op.Swap13
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opHandler swap14, Op.Swap14
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opHandler swap15, Op.Swap15
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opHandler swap16, Op.Swap16
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opHandler log0, Op.Log0
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opHandler log1, Op.Log1
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opHandler log2, Op.Log2
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opHandler log3, Op.Log3
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opHandler log4, Op.Log4
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# ##########################################
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# f0s: System operations.
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template genCreate(callName: untyped, opCode: Op): untyped =
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op callName, inline = false:
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checkInStaticContext(c)
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let
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endowment = c.stack.popInt()
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memPos = c.stack.popInt().safeInt
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when opCode == Create:
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const callKind = evmcCreate
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let memLen {.inject.} = c.stack.peekInt().safeInt
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let salt = 0.u256
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else:
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const callKind = evmcCreate2
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let memLen {.inject.} = c.stack.popInt().safeInt
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let salt = c.stack.peekInt()
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c.stack.top(0)
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let gasParams = GasParams(kind: Create,
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cr_currentMemSize: c.memory.len,
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cr_memOffset: memPos,
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cr_memLength: memLen
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)
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var gasCost = c.gasCosts[Create].c_handler(1.u256, gasParams).gasCost
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when opCode == Create2:
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gasCost = gasCost + c.gasCosts[Create2].m_handler(0, 0, memLen)
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let reason = &"CREATE: GasCreate + {memLen} * memory expansion"
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c.gasMeter.consumeGas(gasCost, reason = reason)
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c.memory.extend(memPos, memLen)
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c.returnData.setLen(0)
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if c.msg.depth >= MaxCallDepth:
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debug "Computation Failure", reason = "Stack too deep", maxDepth = MaxCallDepth, depth = c.msg.depth
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return
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if endowment != 0:
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let senderBalance = c.getBalance(c.msg.contractAddress)
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if senderBalance < endowment:
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debug "Computation Failure", reason = "Insufficient funds available to transfer", required = endowment, balance = senderBalance
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return
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var createMsgGas = c.gasMeter.gasRemaining
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if c.fork >= FkTangerine:
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createMsgGas -= createMsgGas div 64
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c.gasMeter.consumeGas(createMsgGas, reason="CREATE")
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block:
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let childMsg = Message(
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kind: callKind,
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depth: c.msg.depth + 1,
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gas: createMsgGas,
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sender: c.msg.contractAddress,
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value: endowment,
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data: c.memory.read(memPos, memLen)
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)
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var child = newComputation(c.vmState, childMsg, salt)
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c.chainTo(child):
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if not child.shouldBurnGas:
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c.gasMeter.returnGas(child.gasMeter.gasRemaining)
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if child.isSuccess:
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c.merge(child)
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c.stack.top child.msg.contractAddress
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else:
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c.returnData = child.output
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genCreate(create, Create)
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genCreate(create2, Create2)
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proc callParams(c: Computation): (UInt256, UInt256, EthAddress, EthAddress, CallKind, int, int, int, int, MsgFlags) =
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let gas = c.stack.popInt()
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let destination = c.stack.popAddress()
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let value = c.stack.popInt()
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result = (gas,
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value,
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destination,
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c.msg.contractAddress, # sender
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evmcCall,
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c.stack.popInt().cleanMemRef,
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c.stack.popInt().cleanMemRef,
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c.stack.popInt().cleanMemRef,
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c.stack.popInt().cleanMemRef,
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c.msg.flags)
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proc callCodeParams(c: Computation): (UInt256, UInt256, EthAddress, EthAddress, CallKind, int, int, int, int, MsgFlags) =
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let gas = c.stack.popInt()
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let destination = c.stack.popAddress()
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let value = c.stack.popInt()
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result = (gas,
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value,
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destination,
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c.msg.contractAddress, # sender
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evmcCallCode,
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c.stack.popInt().cleanMemRef,
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c.stack.popInt().cleanMemRef,
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c.stack.popInt().cleanMemRef,
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c.stack.popInt().cleanMemRef,
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c.msg.flags)
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proc delegateCallParams(c: Computation): (UInt256, UInt256, EthAddress, EthAddress, CallKind, int, int, int, int, MsgFlags) =
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let gas = c.stack.popInt()
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let destination = c.stack.popAddress()
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result = (gas,
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c.msg.value, # value
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destination,
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c.msg.sender, # sender
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evmcDelegateCall,
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c.stack.popInt().cleanMemRef,
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c.stack.popInt().cleanMemRef,
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c.stack.popInt().cleanMemRef,
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c.stack.popInt().cleanMemRef,
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c.msg.flags)
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proc staticCallParams(c: Computation): (UInt256, UInt256, EthAddress, EthAddress, CallKind, int, int, int, int, MsgFlags) =
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let gas = c.stack.popInt()
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let destination = c.stack.popAddress()
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result = (gas,
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0.u256, # value
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destination,
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c.msg.contractAddress, # sender
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evmcCall,
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c.stack.popInt().cleanMemRef,
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c.stack.popInt().cleanMemRef,
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c.stack.popInt().cleanMemRef,
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c.stack.popInt().cleanMemRef,
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emvcStatic) # is_static
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template genCall(callName: untyped, opCode: Op): untyped =
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op callName, inline = false:
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## CALL, 0xf1, Message-Call into an account
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## CALLCODE, 0xf2, Message-call into this account with an alternative account's code.
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## DELEGATECALL, 0xf4, Message-call into this account with an alternative account's code, but persisting the current values for sender and value.
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## STATICCALL, 0xfa, Static message-call into an account.
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when opCode == Call:
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if emvcStatic == c.msg.flags and c.stack[^3, Uint256] > 0.u256:
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raise newException(StaticContextError, "Cannot modify state while inside of a STATICCALL context")
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let (gas, value, destination, sender, callKind,
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memInPos, memInLen, memOutPos, memOutLen, flags) = `callName Params`(c)
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push: 0
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let (memOffset, memLength) = if calcMemSize(memInPos, memInLen) > calcMemSize(memOutPos, memOutLen):
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(memInPos, memInLen)
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else:
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(memOutPos, memOutLen)
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# EIP2929
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# This came before old gas calculator
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# because it will affect `c.gasMeter.gasRemaining`
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# and further `childGasLimit`
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if c.fork >= FkBerlin:
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c.vmState.mutateStateDB:
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if not db.inAccessList(destination):
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db.accessList(destination)
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# The WarmStorageReadCostEIP2929 (100) is already deducted in the form of a constant `gasCall`
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c.gasMeter.consumeGas(ColdAccountAccessCost - WarmStorageReadCost, reason = "EIP2929 gasCall")
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let contractAddress = when opCode in {Call, StaticCall}: destination else: c.msg.contractAddress
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var (gasCost, childGasLimit) = c.gasCosts[opCode].c_handler(
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value,
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GasParams(kind: opCode,
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c_isNewAccount: not c.accountExists(contractAddress),
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c_gasBalance: c.gasMeter.gasRemaining,
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c_contractGas: gas,
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c_currentMemSize: c.memory.len,
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c_memOffset: memOffset,
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c_memLength: memLength
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))
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# EIP 2046: temporary disabled
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# reduce gas fee for precompiles
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# from 700 to 40
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#when opCode == StaticCall:
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# if c.fork >= FkBerlin and destination.toInt <= MaxPrecompilesAddr:
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# gasCost = gasCost - 660.GasInt
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if gasCost >= 0:
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c.gasMeter.consumeGas(gasCost, reason = $opCode)
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c.returnData.setLen(0)
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if c.msg.depth >= MaxCallDepth:
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debug "Computation Failure", reason = "Stack too deep", maximumDepth = MaxCallDepth, depth = c.msg.depth
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# return unused gas
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c.gasMeter.returnGas(childGasLimit)
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return
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if gasCost < 0 and childGasLimit <= 0:
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raise newException(OutOfGas, "Gas not enough to perform calculation (" & callName.astToStr & ")")
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c.memory.extend(memInPos, memInLen)
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c.memory.extend(memOutPos, memOutLen)
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when opCode in {CallCode, Call}:
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let senderBalance = c.getBalance(sender)
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if senderBalance < value:
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debug "Insufficient funds", available = senderBalance, needed = c.msg.value
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# return unused gas
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c.gasMeter.returnGas(childGasLimit)
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return
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block:
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let msg = Message(
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kind: callKind,
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depth: c.msg.depth + 1,
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gas: childGasLimit,
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sender: sender,
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contractAddress: contractAddress,
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codeAddress: destination,
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value: value,
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data: c.memory.read(memInPos, memInLen),
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flags: flags)
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var child = newComputation(c.vmState, msg)
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c.chainTo(child):
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if not child.shouldBurnGas:
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c.gasMeter.returnGas(child.gasMeter.gasRemaining)
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|
|
|
if child.isSuccess:
|
|
c.merge(child)
|
|
c.stack.top(1)
|
|
|
|
c.returnData = child.output
|
|
let actualOutputSize = min(memOutLen, child.output.len)
|
|
if actualOutputSize > 0:
|
|
c.memory.write(memOutPos,
|
|
child.output.toOpenArray(0, actualOutputSize - 1))
|
|
|
|
genCall(call, Call)
|
|
genCall(callCode, CallCode)
|
|
genCall(delegateCall, DelegateCall)
|
|
genCall(staticCall, StaticCall)
|
|
|
|
op returnOp, inline = false, startPos, size:
|
|
## 0xf3, Halt execution returning output data.
|
|
let (pos, len) = (startPos.cleanMemRef, size.cleanMemRef)
|
|
|
|
c.gasMeter.consumeGas(
|
|
c.gasCosts[Return].m_handler(c.memory.len, pos, len),
|
|
reason = "RETURN"
|
|
)
|
|
|
|
c.memory.extend(pos, len)
|
|
c.output = c.memory.read(pos, len)
|
|
|
|
op revert, inline = false, startPos, size:
|
|
## 0xfd, Halt execution reverting state changes but returning data and remaining gas.
|
|
let (pos, len) = (startPos.cleanMemRef, size.cleanMemRef)
|
|
c.gasMeter.consumeGas(
|
|
c.gasCosts[Revert].m_handler(c.memory.len, pos, len),
|
|
reason = "REVERT"
|
|
)
|
|
|
|
c.memory.extend(pos, len)
|
|
c.output = c.memory.read(pos, len)
|
|
# setError(msg, false) will signal cheap revert
|
|
c.setError("REVERT opcode executed", false)
|
|
|
|
op selfDestruct, inline = false:
|
|
## 0xff Halt execution and register account for later deletion.
|
|
let beneficiary = c.stack.popAddress()
|
|
c.selfDestruct(beneficiary)
|
|
|
|
op selfDestructEip150, inline = false:
|
|
let beneficiary = c.stack.popAddress()
|
|
|
|
let gasParams = GasParams(kind: SelfDestruct,
|
|
sd_condition: not c.accountExists(beneficiary)
|
|
)
|
|
|
|
let gasCost = c.gasCosts[SelfDestruct].c_handler(0.u256, gasParams).gasCost
|
|
c.gasMeter.consumeGas(gasCost, reason = "SELFDESTRUCT EIP150")
|
|
c.selfDestruct(beneficiary)
|
|
|
|
op selfDestructEip161, inline = false:
|
|
checkInStaticContext(c)
|
|
|
|
let
|
|
beneficiary = c.stack.popAddress()
|
|
isDead = not c.accountExists(beneficiary)
|
|
balance = c.getBalance(c.msg.contractAddress)
|
|
|
|
let gasParams = GasParams(kind: SelfDestruct,
|
|
sd_condition: isDead and not balance.isZero
|
|
)
|
|
|
|
let gasCost = c.gasCosts[SelfDestruct].c_handler(0.u256, gasParams).gasCost
|
|
c.gasMeter.consumeGas(gasCost, reason = "SELFDESTRUCT EIP161")
|
|
c.selfDestruct(beneficiary)
|
|
|
|
# Constantinople's new opcodes
|
|
|
|
op selfDestructEIP2929, inline = false:
|
|
checkInStaticContext(c)
|
|
|
|
let
|
|
beneficiary = c.stack.popAddress()
|
|
isDead = not c.accountExists(beneficiary)
|
|
balance = c.getBalance(c.msg.contractAddress)
|
|
|
|
let gasParams = GasParams(kind: SelfDestruct,
|
|
sd_condition: isDead and not balance.isZero
|
|
)
|
|
|
|
var gasCost = c.gasCosts[SelfDestruct].c_handler(0.u256, gasParams).gasCost
|
|
|
|
c.vmState.mutateStateDB:
|
|
if not db.inAccessList(beneficiary):
|
|
db.accessList(beneficiary)
|
|
gasCost = gasCost + ColdAccountAccessCost
|
|
|
|
c.gasMeter.consumeGas(gasCost, reason = "SELFDESTRUCT EIP161")
|
|
c.selfDestruct(beneficiary)
|