Cool! Please share the code on github or whatever. I've been looking at reducing the memory footprint so I tend to consider including dex into your app as a bad thing. But it would be really cool to do the slime dance during development.
I guess a more efficient approach lures in the bsh implementation at android-scripting[1]. I haven't investigated yet but browsing the code reveals it includes a (possibly modified) version of org.objectweb.asm. Remco [1] http://code.google.com/p/android-scripting/ On Tue, Jun 16, 2009 at 5:51 AM, George Jahad<andr...@blackbirdsystems.net> wrote: > > Remco van't Veer has done a lot of great working porting Clojure to > Android, but one thing remains missing, runtime compilation which > would allow a fully functional Repl. The problem is that the Android > VM doesn't use standard Java class files but rather Android specific > ones. There is a host-side tool that converts Java byte codes to > Android ones. But that tool doesn't normally run on Android. > > So, being an Android systems hacker, I was wondering how hard it would > be to get runtime compilation working. > > Turns out, it doesn't seem to be too hard. The trick is basically to > run the Java to Android/Dalvik byte code converter through itself, so > that the convertor can be run on Android; if you load that converted > convertor into Android, you can then invoke it after each class is > compiled, essentially like this: > > if(RT.booleanCast(COMPILE_FILES.deref())) > { > writeClassFile(internalName, bytecode); > String strings[] = {"--dex", "--output=/data/gbj/classes.dex", "/ > data/gbj/classes"}; > com.android.dx.command.Main.main(strings); > } > > (Note that *compile-path* is set elsewhere to "/data/gbj/classes") > > Loading the generated class file is also a bit tricky, but not too > bad. > > > It isn't too fast, partly because of Android's slow GC and partly > because I'm using the filesystem as intermediate storage before > loading the classes, (because I haven't figured out how to do it all > in memory yet.) > > I'll send out a full set of patches if there is interest, but for now > here is an Android app with the repl built in so you can play with > it. (It is version of Remco's simple calculator app with a socket > based repl added.) > > Much thanks to Remco upon whose Android/Clojure work this is all > built. > > App install instructions below. > > g > > > (Note: I've only tested these install instructions out on a Linux host > with this sdk: android-sdk-linux_x86-1.5_r2.zip) > > Download the prebuilt apk file here: > http://georgejahad.com/clojure/calc-debug.apk > > > > To configure the emulator: > emulator -avd <your avd name> > adb install -r calc-debug.apk > adb shell mkdir /data/gbj > adb shell mkdir /data/gbj/classes > adb shell chmod 777 /data/dalvik-cache > adb shell chmod 777 /data/gbj > adb shell chmod 777 /data/gbj/classes > adb forward tcp:8030 tcp:8030 > > > > Then start up the calc app from the emulator gui. > > Then access the repl like so: > telnet localhost 8030 > > Allow compilation like so: > (def *android* true) (def *compile-files* true) > > Now you can compile from the repl. For example, this adds a simple > exponent operator to the calculator: > > (in-ns 'examples.calc) > (defn exp [ b e] (reduce * (repeat b e))) > (def calc-opers {\+ #'+ > \- #'- > \/ #'/ > \* #'* \e #'exp}) > (def calc-allowed-chars (.toCharArray "e0123456789.")) > > You can examine Remco's source code to see how the calculator works > here: > http://github.com/remvee/clj-android/blob/d1e96d33487ddcdc04b403e97f80fcf1b31bb9c2/examples/calc/src/examples/calc.clj > > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
