nimbus-eth1/tests/macro_assembler.nim

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import
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macrocache, strutils, unittest,
stew/byteutils, chronicles, stew/ranges, eth/common,
../nimbus/vm/interpreter/opcode_values,
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stew/shims/macros
import
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options, json, os, eth/trie/[db, hexary],
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../nimbus/[vm_state, tracer, vm_types, transaction, utils],
../nimbus/db/[db_chain, state_db],
../nimbus/vm_state_transactions,
../nimbus/vm/interpreter/[vm_forks, gas_costs],
../nimbus/vm/[message, computation, memory]
export opcode_values, byteutils
{.experimental: "dynamicBindSym".}
# backported from Nim 0.19.9
# remove this when we use newer Nim
proc newLitFixed*(arg: enum): NimNode {.compileTime.} =
result = newCall(
arg.type.getTypeInst[1],
newLit(int(arg))
)
type
VMWord* = array[32, byte]
Storage* = tuple[key, val: VMWord]
Assembler* = object
title*: string
stack*: seq[VMWord]
memory*: seq[VMWord]
storage*: seq[Storage]
code*: seq[byte]
logs*: seq[Log]
success*: bool
gasLimit*: GasInt
gasUsed*: GasInt
data*: seq[byte]
output*: seq[byte]
fork*: Fork
const
idToOpcode = CacheTable"NimbusMacroAssembler"
static:
for n in Op:
idToOpcode[$n] = newLit(ord(n))
proc validateVMWord(val: string, n: NimNode): VMWord =
if val.len <= 2 or val.len > 66: error("invalid hex string", n)
if not (val[0] == '0' and val[1] == 'x'): error("invalid hex string", n)
let zerosLen = 64 - (val.len - 2)
let value = repeat('0', zerosLen) & val.substr(2)
hexToByteArray(value, result)
proc validateVMWord(val: NimNode): VMWord =
val.expectKind(nnkStrLit)
validateVMWord(val.strVal, val)
proc parseVMWords(list: NimNode): seq[VMWord] =
result = @[]
list.expectKind nnkStmtList
for val in list:
result.add validateVMWord(val)
proc validateStorage(val: NimNode): Storage =
val.expectKind(nnkCall)
val[0].expectKind(nnkStrLit)
val[1].expectKind(nnkStmtList)
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doAssert(val[1].len == 1)
val[1][0].expectKind(nnkStrLit)
result = (validateVMWord(val[0]), validateVMWord(val[1][0]))
proc parseStorage(list: NimNode): seq[Storage] =
result = @[]
list.expectKind nnkStmtList
for val in list:
result.add validateStorage(val)
proc parseSuccess(list: NimNode): bool =
list.expectKind nnkStmtList
list[0].expectKind(nnkIdent)
$list[0] == "true"
proc parseData(list: NimNode): seq[byte] =
result = @[]
list.expectKind nnkStmtList
for n in list:
n.expectKind(nnkStrLit)
result.add hexToSeqByte(n.strVal)
proc parseLog(node: NimNode): Log =
node.expectKind(nnkPar)
for item in node:
item.expectKind(nnkExprColonExpr)
let label = item[0].strVal
let body = item[1]
case label.normalize
of "address":
body.expectKind(nnkStrLit)
let value = body.strVal
if value.len < 20:
error("bad address format", body)
hexToByteArray(value, result.address)
of "topics":
body.expectKind(nnkBracket)
for x in body:
result.topics.add validateVMWord(x.strVal, x)
of "data":
result.data = hexToSeqByte(body.strVal)
else:error("unknown log section '" & label & "'", item[0])
proc parseLogs(list: NimNode): seq[Log] =
result = @[]
list.expectKind nnkStmtList
for n in list:
result.add parseLog(n)
proc validateOpcode(sym: NimNode) =
let typ = getTypeInst(sym)
typ.expectKind(nnkSym)
if $typ != "Op":
error("unknown opcode '" & $sym & "'", sym)
proc addOpCode(code: var seq[byte], node, params: NimNode) =
node.expectKind nnkSym
let opcode = Op(idToOpcode[node.strVal].intVal)
case opcode
of Push1..Push32:
if params.len != 1:
error("expect 1 param, but got " & $params.len, node)
let paramWidth = (opcode.ord - 95) * 2
params[0].expectKind nnkStrLit
var val = params[0].strVal
if val[0] == '0' and val[1] == 'x':
val = val.substr(2)
if val.len != paramWidth:
error("expected param with " & $paramWidth & " hex digits, got " & $val.len, node)
code.add byte(opcode)
code.add hexToSeqByte(val)
else:
error("invalid hex format", node)
else:
if params.len > 0:
error("there should be no param for this instruction", node)
code.add byte(opcode)
proc parseCode(codes: NimNode): seq[byte] =
let emptyNode = newEmptyNode()
codes.expectKind nnkStmtList
for pc, line in codes:
line.expectKind({nnkCommand, nnkIdent, nnkStrLit})
if line.kind == nnkStrLit:
result.add hexToSeqByte(line.strVal)
elif line.kind == nnkIdent:
let sym = bindSym(line)
validateOpcode(sym)
result.addOpCode(sym, emptyNode)
elif line.kind == nnkCommand:
let sym = bindSym(line[0])
validateOpcode(sym)
var params = newNimNode(nnkBracket)
for i in 1 ..< line.len:
params.add line[i]
result.addOpCode(sym, params)
else:
error("unknown syntax: " & line.toStrLit.strVal, line)
proc parseFork(fork: NimNode): Fork =
fork[0].expectKind({nnkIdent, nnkStrLit})
parseEnum[Fork](strip(fork[0].strVal))
proc generateVMProxy(boa: Assembler): NimNode =
let
vmProxy = genSym(nskProc, "vmProxy")
blockNumber = ident("blockNumber")
chainDB = ident("chainDB")
title = boa.title
body = newLitFixed(boa)
result = quote do:
test `title`:
proc `vmProxy`(): bool =
let boa = `body`
runVM(`blockNumber`, `chainDB`, boa)
check `vmProxy`()
when defined(macro_assembler_debug):
echo result.toStrLit.strVal
const
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blockFile = "tests" / "fixtures" / "PersistBlockTests" / "block47205.json"
proc initComputation(vmState: BaseVMState, tx: Transaction, sender: EthAddress, data: seq[byte], forkOverride=none(Fork)) : BaseComputation =
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doAssert tx.isContractCreation
let fork =
if forkOverride.isSome:
forkOverride.get
else:
vmState.blockNumber.toFork
let gasUsed = 0 #tx.payload.intrinsicGas.GasInt + gasFees[fork][GasTXCreate]
let contractAddress = generateAddress(sender, tx.accountNonce)
let msg = newMessage(tx.gasLimit - gasUsed, tx.gasPrice, tx.to, sender, tx.value, data, tx.payload,
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contractCreation = false,
options = newMessageOptions(origin = sender, createAddress = contractAddress))
newBaseComputation(vmState, vmState.blockNumber, msg, some(fork))
proc initDatabase*(): (Uint256, BaseChainDB) =
let
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node = json.parseFile(blockFile)
blockNumber = UInt256.fromHex(node["blockNumber"].getStr())
memoryDB = newMemoryDB()
state = node["state"]
for k, v in state:
let key = hexToSeqByte(k)
let value = hexToSeqByte(v.getStr())
memoryDB.put(key, value)
result = (blockNumber, newBaseChainDB(memoryDB, false))
proc initComputation(blockNumber: Uint256, chainDB: BaseChainDB, payload, data: seq[byte], fork: Fork): BaseComputation =
let
parentNumber = blockNumber - 1
parent = chainDB.getBlockHeader(parentNumber)
header = chainDB.getBlockHeader(blockNumber)
headerHash = header.blockHash
body = chainDB.getBlockBody(headerHash)
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vmState = newBaseVMState(parent.stateRoot, header, chainDB)
var
tx = body.transactions[0]
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sender = transaction.getSender(tx)
tx.payload = payload
tx.gasLimit = 500000000
initComputation(vmState, tx, sender, data, some(fork))
proc runVM*(blockNumber: Uint256, chainDB: BaseChainDB, boa: Assembler): bool =
var computation = initComputation(blockNumber, chainDB, boa.code, boa.data, boa.fork)
let gas = computation.gasMeter.gasRemaining
execComputation(computation)
let gasUsed = gas - computation.gasMeter.gasRemaining
if computation.isSuccess:
if boa.success == false:
error "different success value", expected=boa.success, actual=true
return false
else:
if boa.success == true:
error "different success value", expected=boa.success, actual=false
return false
if boa.stack.len != computation.stack.values.len:
error "different stack len", expected=boa.stack.len, actual=computation.stack.values.len
return false
for i, v in computation.stack.values:
let actual = v.dumpHex()
let val = boa.stack[i].toHex()
if actual != val:
error "different stack value", idx=i, expected=val, actual=actual
return false
const chunkLen = 32
let numChunks = computation.memory.len div chunkLen
if numChunks != boa.memory.len:
error "different memory len", expected=boa.memory.len, actual=numChunks
return false
for i in 0 ..< numChunks:
let actual = computation.memory.bytes.toOpenArray(i * chunkLen, (i + 1) * chunkLen - 1).toHex()
let mem = boa.memory[i].toHex()
if mem != actual:
error "different memory value", idx=i, expected=mem, actual=actual
return false
var
stateDB = computation.vmState.accountDb
account = stateDB.getAccount(computation.msg.storageAddress)
trie = initSecureHexaryTrie(chainDB.db, account.storageRoot)
for kv in boa.storage:
let key = kv[0].toHex()
let val = kv[1].toHex()
let keyBytes = (@(kv[0])).toRange
let actual = trie.get(keyBytes).toOpenArray().toHex()
let zerosLen = 64 - (actual.len)
let value = repeat('0', zerosLen) & actual
if val != value:
error "storage has different value", key=key, expected=val, actual=value
return false
let logs = computation.vmState.logEntries
if logs.len != boa.logs.len:
error "different logs len", expected=boa.logs.len, actual=logs.len
return false
for i, log in boa.logs:
let eAddr = log.address.toHex()
let aAddr = logs[i].address.toHex()
if eAddr != aAddr:
error "different address", expected=eAddr, actual=aAddr, idx=i
return false
let eData = log.data.toHex()
let aData = logs[i].data.toHex()
if eData != aData:
error "different data", expected=eData, actual=aData, idx=i
return false
if log.topics.len != logs[i].topics.len:
error "different topics len", expected=log.topics.len, actual=logs[i].topics.len, idx=i
return false
for x, t in log.topics:
let eTopic = t.toHex()
let aTopic = logs[i].topics[x].toHex()
if eTopic != aTopic:
error "different topic in log entry", expected=eTopic, actual=aTopic, logIdx=i, topicIdx=x
return false
if boa.output.len > 0:
let actual = computation.output.toHex()
let expected = boa.output.toHex()
if expected != actual:
error "different output detected", expected=expected, actual=actual
return false
result = true
macro assembler*(list: untyped): untyped =
var boa = Assembler(success: true, fork: FkFrontier)
list.expectKind nnkStmtList
for callSection in list:
callSection.expectKind(nnkCall)
let label = callSection[0].strVal
let body = callSection[1]
case label.normalize
of "title":
let title = body[0]
title.expectKind(nnkStrLit)
boa.title = title.strVal
of "code" : boa.code = parseCode(body)
of "memory": boa.memory = parseVMWords(body)
of "stack" : boa.stack = parseVMWords(body)
of "storage": boa.storage = parseStorage(body)
of "logs": boa.logs = parseLogs(body)
of "success": boa.success = parseSuccess(body)
of "data": boa.data = parseData(body)
of "output": boa.output = parseData(body)
of "fork": boa.fork = parseFork(body)
else: error("unknown section '" & label & "'", callSection[0])
result = boa.generateVMProxy()