scalac generating annotations

Hi,
There was a thread on the users ml about scalac not currently being able to generate runtime (or retained?) annotation classes. One of the sticking points raised was the lack of support for emitting the bytecode for annotations. I've had a quick dive into scalac, and it looks like it uses fjbg for bytecode generation. I've written bytecode generators before, including one that dealt with annotations. However, before I started getting to know fjbg I wanted to check some things.
1. Is fjbg the library that's currently used by scalac for bytecode generation? It certainly seems that way from following things through from the nsc scala source.
2. I've made a cursory search through fjbg and can't find any support whatsoever for representing annotations. I may be being blind. If fjbg is being used this confuses me as last I checked, you could annotate scala code with annotations that where then available to the JVM at run-time. I've had a dig through for occurrences of ACC_ANNOTATION and 0x2000 but not found anything that looks like annotation-writing code. What am I missing?
3. Are there any intentions of moving to one of the 3rd party, off-the-shelf libraries that already have all this stuff implemented and working?
4. Is there a plan to use a bytecode generator implemented in Scala rather than Java? If so, will fjbg be retired?

I'm looking at svn revision 25081, which should be the newest trunk I think.
Thanks,
Matthew
--
Matthew Pocockmailto: turingatemyhamster@gmail.com gchat: turingatemyhamster@gmail.commsn: matthew_pocock@yahoo.co.ukirc.freenode.net: drdozer (0191) 2566550

Hi,
There was a thread on the users ml about scalac not currently being able to generate runtime (or retained?) annotation classes. One of the sticking points raised was the lack of support for emitting the bytecode for annotations. I've had a quick dive into scalac, and it looks like it uses fjbg for bytecode generation. I've written bytecode generators before, including one that dealt with annotations. However, before I started getting to know fjbg I wanted to check some things.
1. Is fjbg the library that's currently used by scalac for bytecode generation?

It certainly seems that way from following things through from the nsc scala source.
2. I've made a cursory search through fjbg and can't find any support whatsoever for representing annotations. I may be being blind. If fjbg is being used this confuses me as last I checked, you could annotate scala code with annotations that where then available to the JVM at run-time. I've had a dig through for occurrences of ACC_ANNOTATION and 0x2000 but not found anything that looks like annotation-writing code. What am I missing?

3. Are there any intentions of moving to one of the 3rd party, off-the-shelf libraries that already have all this stuff implemented and working?

4. Is there a plan to use a bytecode generator implemented in Scala rather than Java? If so, will fjbg be retired?

I'm looking at svn revision 25081, which should be the newest trunk I think.
Thanks,
Matthew
--
Matthew Pocockmailto: turingatemyhamster@gmail.com gchat: turingatemyhamster@gmail.commsn: matthew_pocock@yahoo.co.ukirc.freenode.net: drdozer (0191) 2566550

On 6/14/11 12:12 AM, Lukas Rytz wrote:
> there was some discussion some time ago to rewrite fjbg in Scala.
> http://scala-programming-language.1934581.n4.nabble.com/scala-FJBG-port-...
> http://www.drmaciver.com/repos/fjbg/

I did rewrite it in scala way back in 2008 but it was clear it would
never be as fast unless I wrote java-in-scala, which lacked appeal.

https://github.com/paulp-etc/ssbg

I finished it, and had trunk fully bootstrapped with it: but I don't
think I left it in a particularly working state.