Implement plugable EVM tracer

available tracers:
- Legacy tracer
- new Json tracer

nimbus/evm/computation.nim

@@ -11,7 +11,7 @@
 import
  ".."/[db/accounts_cache, constants],
  "."/[code_stream, memory, message, stack, state],
- "."/[transaction_tracer, types],
+ "."/[types],
  ./interpreter/[gas_meter, gas_costs, op_codes],
  ../common/[common, evmforks],
  ../utils/utils,
@@ -386,22 +386,37 @@ proc refundSelfDestruct*(c: Computation) =
  c.gasMeter.refundGas(cost * num)
 
 proc tracingEnabled*(c: Computation): bool =
- TracerFlags.EnableTracing in c.vmState.tracer.flags
-
-proc traceOpCodeStarted*(c: Computation, op: Op): int
- {.gcsafe, raises: [CatchableError].} =
- c.vmState.tracer.traceOpCodeStarted(c, op)
-
-proc traceOpCodeEnded*(c: Computation, op: Op, lastIndex: int)
- {.gcsafe, raises: [CatchableError].} =
- c.vmState.tracer.traceOpCodeEnded(c, op, lastIndex)
-
-proc traceError*(c: Computation)
- {.gcsafe, raises: [CatchableError].} =
- c.vmState.tracer.traceError(c)
+ c.vmState.tracingEnabled
+
+proc traceOpCodeStarted*(c: Computation, op: Op): int {.gcsafe, raises: [].} =
+ c.vmState.captureOpStart(
+ c.code.pc - 1,
+ op,
+ c.gasMeter.gasRemaining,
+ c.msg.depth + 1)
+
+proc traceOpCodeEnded*(c: Computation, op: Op, opIndex: int) {.gcsafe, raises: [].} =
+ c.vmState.captureOpEnd(
+ c.code.pc - 1,
+ op,
+ c.gasMeter.gasRemaining,
+ c.gasMeter.gasRefunded,
+ c.returnData,
+ c.msg.depth + 1,
+ opIndex)
+
+proc traceError*(c: Computation) {.gcsafe, raises: [].} =
+ c.vmState.captureFault(
+ c.code.pc - 1,
+ c.instr,
+ c.gasMeter.gasRemaining,
+ c.gasMeter.gasRefunded,
+ c.returnData,
+ c.msg.depth + 1,
+ some(c.error.info))
 
 proc prepareTracer*(c: Computation) =
- c.vmState.tracer.prepare(c.msg.depth)
+ c.vmState.capturePrepare(c.msg.depth)
 
 # ------------------------------------------------------------------------------
 # End

nimbus/evm/interpreter_dispatch.nim

@@ -171,8 +171,30 @@ proc afterExecCreate(c: Computation)
  else:
  c.rollback()
 
+
+const
+ MsgKindToOp: array[CallKind, Op] = [
+ CALL,
+ DELEGATECALL,
+ CALLCODE,
+ CREATE,
+ CREATE2
+ ]
+
+func msgToOp(msg: Message): Op =
+ if emvcStatic == msg.flags:
+ return STATICCALL
+ MsgKindToOp[msg.kind]
+
 proc beforeExec(c: Computation): bool
  {.gcsafe, raises: [ValueError].} =
+
+ if c.msg.depth > 0:
+ c.vmState.captureEnter(msgToOp(c.msg),
+ c.msg.sender, c.msg.contractAddress,
+ c.msg.data, c.msg.gas,
+ c.msg.value)
+
  if not c.msg.isCreate:
  c.beforeExecCall()
  false
@@ -181,11 +203,20 @@ proc beforeExec(c: Computation): bool
 
 proc afterExec(c: Computation)
  {.gcsafe, raises: [CatchableError].} =
+
  if not c.msg.isCreate:
  c.afterExecCall()
  else:
  c.afterExecCreate()
 
+ if c.msg.depth > 0:
+ let gasUsed = c.msg.gas - c.gasMeter.gasRemaining
+ let error = if c.isError:
+ some(c.error.info)
+ else:
+ none(string)
+ c.vmState.captureExit(c.output, gasUsed, error)
+
 # ------------------------------------------------------------------------------
 # Public functions
 # ------------------------------------------------------------------------------
@@ -306,7 +337,7 @@ proc asyncExecCallOrCreate*(c: Computation): Future[void] {.async.} =
  defer: c.dispose()
 
  await ifNecessaryGetCode(c.vmState, c.msg.contractAddress)
- 
+
  if c.beforeExec():
  return
  c.executeOpcodes()