How to write a Scala macro that evaluates to a Tree similar to "reify" -

i want write macro captures program snippet , makes available tree @ runtime. basically, want functionality of reify embed in different syntax. want call apply on workload companion object, supply code , store tree of supplied code in member of newly created workload object.

val wl = workload {   // code ... }  wl.tree // tree of 'some code' 

unfortunately, can not forward reify because macro. guess, have write own macro similar reify. have no idea how return tree macro , source of reify mentions hardwired implementation.

how can accomplished?

update

i wrote small example underline point

import scala.reflect.runtime.universe._  object macrofun {   import scala.reflect.macros.blackbox.context   import scala.language.experimental.macros    def getsometree: expr[unit] = macro gettreeimpl    def gettreeimpl(c: context): c.expr[expr[unit]] = {     import c.universe._      val expr = reify {       println("hello world!")     }      ???   } } 

the thing missing, way turn expr c.expr[expr[unit]]

here how did in end. make sure call reify on runtime universe expr not depend on context.

class erplmacro(val c: context) {   def lift[t:c.weaktypetag](exp: c.expr[t]) = {     import c.universe._     q"""erplruntime.compile(scala.reflect.runtime.universe.reify($exp))"""   } }  object erplruntime {   def compile[t](ctxelems: (scala.symbol,any)*)(exp: expr[t]): unit = // ... }  trait erplapi {   def compile[t](exp: t): unit = macro erplmacro.lift[t] }