Re: [Sablevm-developer] Threading support in SableVM

[Chris P. <chr...@ma...>]

Etienne Gagnon wrote:
> Chris Pickett wrote:
> 
>> ...  One of the more repeatable errors involves an "impossible control 
>> flow" in interpreter.c -- but I can't get an instruction trace on this 
>> so it seems useless.
> 
> 
> Can't you at least call _svmf_dump_stack_trace() [or something like that,
> I don't remember the exact name]?
> 

(Thread.java:-1)  java/lang/Thread.run
(VMThread.java:116)  java/lang/VMThread.callRun
(Thread.java:343)  java/lang/Thread.callRun
(VirtualMachine.java:117)  java/lang/VirtualMachine.runThread
sablevm: INTERNAL ERROR (source file "interpreter.c", line 333): 
impossible control flow

(gdb) bt
#0  0x4012e781 in kill () from /lib/libc.so.6
#1  0x400b4e5e in pthread_kill () from /lib/libpthread.so.0
#2  0x400b5339 in raise () from /lib/libpthread.so.0
#3  0x4012fbe1 in abort () from /lib/libc.so.6
#4  0x4008cabd in _svmh_fatal_error (filename=0x40096c61 
"interpreter.c", linenumber=333, msg=0x4008faca "impossible control 
flow") at fatal.c:29
#5  0x400701c0 in _svmf_interpreter (_env=0x8066e00) at interpreter.c:333
#6  0x40028e2b in _svmh_invoke_static_virtualmachine_runthread 
(env=0x8066e00) at method_invoke.c:5065
#7  0x4001f897 in _svmf_thread_start (_env=0x8066e00) at thread.c:1427
#8  0x400b20ba in pthread_start_thread () from /lib/libpthread.so.0
#9  0x401d4d6a in clone () from /lib/libc.so.6
(gdb)

So it looks like the same kind of error as for the NullPointerException 
that gets thrown by ThreadStarter.java that I sent earlier on.

(test case attached for future reference)