On Jun 16, 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
>
Is your source code available somewhere? (I'm interested to know how
you added the socket based REPL and how it interacts with the app )
Raphaël
> 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/d1e96d33487ddcdc04b403e97f8...
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