Add JNI tapset

[Mark Wielaard]

Hi,

This adds the promised Systemtap JNI tapset to unlock the full power of
tracing your JNI invocations. The following script is pretty cool to run
now:

$ stap -I j2sdk-image/tapset  -e \
  'probe hotspot.method_entry {
    log(thread_indent(1) . " => " . probestr) }
   probe hotspot.method_return {
    log(thread_indent(-1) . " <= " . probestr) }
   probe hotspot.jni.* {
    log(thread_indent(1) . " => " . probestr) }
   probe hotspot.jni.*.return {
    log(thread_indent(-1) . " <= " . name . " " . retstr) }' \
 -c 'j2sdk-image/jre/bin/java -XX:+ExtendedDTraceProbes Hello'

Warning, lots and lots of output :) It will show all java method calls
interleaved with all jni method calls of your program.

Writing the tapset was more work than I imagined (there are 473 new
probe points). So I scripted it mostly. I also added the script I used
to the repository just in case someone would want to regenerate the
tapset from scratch again.

2009-10-19  Mark Wielaard  <mjw at redhat.com>

       * tapset/hotspot_jni.stp.in: New tapset.
       * scripts/jni_create_stap.c: New file.
       * scripts/jni_desc: Likewise.
       * configure.ac (AC_CONFIG_FILES): Add tapset/hotspot_jni.stp.
       * Makefile.am (EXTRA_DIST): Add tapsets and scripts.
       (stamps/icedtea.stamp): Handle tapset/hotspot_jni.stp.in.
       (stamps/icedtea-debug.stamp): Likewise.

(scripts and actual tapset/hotspot_jni.stp.in not included in patch
below because they are pretty big and boring).

Committed and pushed,

Mark
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