[MinGW] RFA: Fix GetCallerInfo() for Targets Using SJLJ EH

[Ranjit Mathew]

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Hi,

  _Jv_StackTrace::GetCallerInfo() in stacktrace.cc does not
do anything if the target uses SJLJ EH. The attached patch
proposes to fix this. It also changes fallback_backtrace()
in sysdep/i386/backtrace.h to call the trace callback
function in STATE, if any, and to update STATE->POS with
every frame rather than once at the end.

It seems difficult to exercise this code path though.
Class.forName() doesn't use this function any more and
it indeed works for MinGW even without this patch.
Class.getClassLoader() also seems to ordinarily bypass
this function.

Tested via an i686-pc-linux-gnu to i686-pc-mingw32
cross-compiler.

OK to apply to trunk?

Thanks,
Ranjit.

- --
Ranjit Mathew       Email: rmathew AT gmail DOT com

Bangalore, INDIA.     Web: http://rmathew.com/




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