nimbus-eth1/nimbus/vm2/interpreter_dispatch.nim

# 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.

import
  ./compu_helper,
  ./interpreter/[forks_list, gas_costs, gas_meter,
                 op_codes, op_handlers, op_handlers/oph_defs],
  ./code_stream,
  ./v2types,
  chronicles

logScope:
  topics = "vm opcode"

proc selectVM*(c: Computation, fork: Fork) {.gcsafe.} =
  var desc: Vm2Ctx

  if c.tracingEnabled:
    c.prepareTracer()

  while true:
    c.instr = c.code.next()
    var op = c.instr

    if op == Stop:
      trace "op: Stop"
      if not c.code.atEnd() and c.tracingEnabled:
        c.opIndex = c.traceOpCodeStarted(Stop)
        c.traceOpCodeEnded(Stop, c.opIndex)
      break

    if c.tracingEnabled:
      c.opIndex = c.traceOpCodeStarted(op)
    if BaseGasCosts[op].kind == GckFixed:
      c.gasMeter.consumeGas(c.gasCosts[op].cost, reason = $op)

    desc.cpt = c
    opHandlersRun(fork, op, desc)

    if c.tracingEnabled:
      c.traceOpCodeEnded(op, c.opIndex)

    case op
    of Create, Create2, Call, CallCode, DelegateCall, StaticCall:
      if not c.continuation.isNil:
        break
    of Return, Revert, SelfDestruct:
      break
    else:
      discard