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Re: gcj 4.6 on OpenBSD/x86


On 10/08/2012 01:07 PM, Kurt Miller wrote:
Hi,

Previously I ported gcj in gcc 4.2.4 to OpenBSD. I currently use it to build classpath-0.98 and bootstrap Oracle's 1.6 JVM using classpath and jamvm. I'm now working on gcj from gcc 4.6.3 on x86 and have run into an issue that I could use some help with.

gjar is segfaulting while throwing a ClassCastException from frame 3. Here is some debugging output showing the state and some variables leading up to the segfault. I'm not sure where to go from here. I can't seem to find the root cause of this issue other than something is wrong with 'obj' in frame 3 and obj->getClass()->getName() fails. Any ideas on how to proceed with the debugging on this issue?

Core was generated by `egjar'.
Program terminated with signal 11, Segmentation fault.
#0  0x0c392970 in _Jv_NewStringUTF (bytes=0xfc408b05 <Address 0xfc408b05 out of bounds>)
     at /usr/obj/i386/ports/gcc-4.6.3/gcc-4.6.3/libjava/java/lang/natString.cc:245
245       int size = strlen (bytes);



I haven't studied it closely, but it would appear that 'bytes=0xfc408b05 <Address 0xfc408b05 out of bounds>' indicates a real problem. If it is truly a bad pointer value, you need to figure out where it came from and fix it.


David Daney



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