Re: Reminder: Illegal Package-Private Accesses in libgcj

[Andrew Haley <aph at redhat dot com>]

Bryce McKinlay writes:
 > 
 > On Nov 4, 2003, at 12:25 AM, Andrew Haley wrote:
 > 
 > > Bryce McKinlay writes:
 > >>
 > >> If there are targets that will never support the unwinder (are
 > >> there?), then it might make sense to allow platforms to define some
 > >> platform-specific unwinding functions, but ideally, by far the
 > >> cleanest and most efficient solution is to get the libgcc DWARF2
 > >> unwinder working.
 > >
 > > Efficient?  I don't think so.  The glibc backtrace() function simply
 > > walks a linked list, and there's no more efficient way to do it than
 > > that.  The DWARF unwinder is a couple of orders of magnitude slower.
 > 
 > OK, but how do you get the java.lang.Class object from the IP value 
 > which backtrace() gives you?

We look it up in a hash table.  We sure don't call external programs!

Andrew.