hotspot dtrace support in soylatte

[Michael Allman]

Hello All,

After working on this problem for a few weeks, I was hoping this could be 
a great big happy announcement that I've ported the Solaris Hotspot dtrace 
probes to Soylatte on Leopard.  However, I have to admit I am stuck and at 
a loss for how to proceed.  If this were a Java problem, I'd have it 
solved by now.  But frankly, at this level of C/C++ I don't know WTF I'm 
doing, and what I have done is more like a half blind merge of code from 
os/solaris to os/bsd.  So apologies for coming here with little to offer.

FWIW, this is the error I get where I'm stuck:

Compiling dtrace.d
/usr/sbin/dtrace  -C -I. -h -o dtrace.o -s dtrace.d \
      classLoadingService.o hashtable.o java.o jni.o memoryManager.o 
objectMonitor_bsd.o runtimeService.o sharedRuntime.o synchronizer.o 
thread.o vmCMSOperations.o vmGCOperations.o ciEnv.o compileBroker.o 
nmethod.o  ||\
   STATUS=$?;\
 	if [ x"$STATUS" = x"1" -a \
        x`uname -r` = x"5.10" -a \
        x`uname -p` = x"sparc" ]; then\
     echo 
"*****************************************************************";\
     echo "* If you are building server compiler, and the error message is 
";\
     echo "* \"incorrect ELF machine type...\", you have run into solaris 
bug ";\
     echo "* 6213962, \"dtrace -G doesn't work on sparcv8+ object 
files\".";\
     echo "* Either patch/upgrade your system (>= S10u1_15), or set the ";\
     echo "* environment variable HOTSPOT_DISABLE_DTRACE_PROBES to disable 
";\
     echo "* dtrace probes for this build.";\
     echo 
"*****************************************************************";\
   fi;\
   exit $STATUS
dtrace: failed to compile script dtrace.d: line 963: extraneous argument 
'nmethod.o' ($15 is not referenced)

I had to hack quite a few things just to get this far.  I can probably 
provide a patch against Landon Fuller's branch at 
http://hg.bikemonkey.org/javasrc_1_6_jrl_darwin/ to anyone who's seriously 
interested, but I think that someone with the right skills and motivation 
could probably reproduce my work --- and more to the point, do it 
correctly --- on their own in a matter of hours.

Perhaps someone with dtrace expertise can explain the problem here.  I 
fear it's a limitation of Leopard's port of DTrace.  But anyway, what 
would be extra super would be someone who knows WTF they're doing taking a 
look at soylatte and dtrace on Leopard and letting me know if this port 
has any chance of working.

Thanks.

Michael