130 lines
4.2 KiB
Nim
130 lines
4.2 KiB
Nim
import
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json, strutils, sets, hashes,
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chronicles, nimcrypto, eth/common, stint,
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./types, ./memory, ./stack, ../db/accounts_cache,
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eth/trie/hexary,
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./interpreter/opcode_values
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logScope:
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topics = "vm opcode"
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proc hash*(x: Uint256): Hash =
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result = hash(x.toByteArrayBE)
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proc initTracer*(tracer: var TransactionTracer, flags: set[TracerFlags] = {}) =
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tracer.trace = newJObject()
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# make appear at the top of json object
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tracer.trace["gas"] = %0
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tracer.trace["failed"] = %false
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tracer.trace["returnValue"] = %""
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tracer.trace["structLogs"] = newJArray()
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tracer.flags = flags
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tracer.accounts = initHashSet[EthAddress]()
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tracer.storageKeys = @[]
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proc prepare*(tracer: var TransactionTracer, compDepth: int) =
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# this uncommon arragement is intentional
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# compDepth will be varying up and down: 1,2,3,4,3,3,2,2,1
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# see issue #245 and PR #247 discussion
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if compDepth >= tracer.storageKeys.len:
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let prevLen = tracer.storageKeys.len
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tracer.storageKeys.setLen(compDepth + 1)
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for i in prevLen ..< tracer.storageKeys.len - 1:
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tracer.storageKeys[i] = initHashSet[Uint256]()
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tracer.storageKeys[compDepth] = initHashSet[Uint256]()
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proc rememberStorageKey(tracer: var TransactionTracer, compDepth: int, key: Uint256) =
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tracer.storageKeys[compDepth].incl key
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iterator storage(tracer: TransactionTracer, compDepth: int): Uint256 =
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doAssert compDepth >= 0 and compDepth < tracer.storageKeys.len
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for key in tracer.storageKeys[compDepth]:
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yield key
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proc traceOpCodeStarted*(tracer: var TransactionTracer, c: Computation, op: Op): int =
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if unlikely tracer.trace.isNil:
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tracer.initTracer()
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let j = newJObject()
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tracer.trace["structLogs"].add(j)
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j["op"] = %(($op).toUpperAscii)
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j["pc"] = %(c.code.pc - 1)
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j["depth"] = %(c.msg.depth + 1)
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j["gas"] = %c.gasMeter.gasRemaining
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# log stack
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if TracerFlags.DisableStack notin tracer.flags:
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let st = newJArray()
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for v in c.stack.values:
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st.add(%v.dumpHex())
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j["stack"] = st
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# log memory
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if TracerFlags.DisableMemory notin tracer.flags:
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let mem = newJArray()
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const chunkLen = 32
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let numChunks = c.memory.len div chunkLen
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for i in 0 ..< numChunks:
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mem.add(%c.memory.bytes.toOpenArray(i * chunkLen, (i + 1) * chunkLen - 1).toHex())
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j["memory"] = mem
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if TracerFlags.EnableAccount in tracer.flags:
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case op
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of Call, CallCode, DelegateCall, StaticCall:
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if c.stack.values.len > 2:
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tracer.accounts.incl c.stack[^2, EthAddress]
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of ExtCodeCopy, ExtCodeSize, Balance, SelfDestruct:
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if c.stack.values.len > 1:
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tracer.accounts.incl c.stack[^1, EthAddress]
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else:
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discard
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if TracerFlags.DisableStorage notin tracer.flags:
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if op == Sstore:
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if c.stack.values.len > 1:
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tracer.rememberStorageKey(c.msg.depth, c.stack[^1, Uint256])
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result = tracer.trace["structLogs"].len - 1
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proc traceOpCodeEnded*(tracer: var TransactionTracer, c: Computation, op: Op, lastIndex: int) =
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let j = tracer.trace["structLogs"].elems[lastIndex]
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# TODO: figure out how to get storage
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# when contract execution interrupted by exception
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if TracerFlags.DisableStorage notin tracer.flags:
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var storage = newJObject()
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if c.msg.depth < tracer.storageKeys.len:
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var stateDB = c.vmState.stateDB
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for key in tracer.storage(c.msg.depth):
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let value = stateDB.getStorage(c.msg.contractAddress, key)
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storage[key.dumpHex] = %(value.dumpHex)
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j["storage"] = storage
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let gasRemaining = j["gas"].getBiggestInt()
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j["gasCost"] = %(gasRemaining - c.gasMeter.gasRemaining)
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if op in {Return, Revert}:
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let returnValue = %("0x" & toHex(c.output, true))
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j["returnValue"] = returnValue
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tracer.trace["returnValue"] = returnValue
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trace "Op", json = j.pretty()
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proc traceError*(tracer: var TransactionTracer, c: Computation) =
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if tracer.trace["structLogs"].elems.len > 0:
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let j = tracer.trace["structLogs"].elems[^1]
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j["error"] = %(c.error.info)
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trace "Error", json = j.pretty()
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# even though the gasCost is incorrect,
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# we have something to display,
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# it is an error anyway
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let gasRemaining = j["gas"].getBiggestInt()
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j["gasCost"] = %(gasRemaining - c.gasMeter.gasRemaining)
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tracer.trace["failed"] = %true
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