Re: basic block reordering + java

[Andrew Haley <aph at cambridge dot redhat dot com>]

Jakub Jelinek writes:
 > On Fri, Sep 21, 2001 at 03:30:09PM +0100, Andrew Haley wrote:
 > > Anthony Green writes:
 > >  > 
 > >  > Also, I find that if the last NullPointerException branch is taken,
 > >  > printStackTrace() will produce incorrect results.  You end up seeing the
 > >  > function after this in place of the one calling _Jv_ThrowNullPointerException.
 > >  > Should we be backing up the program counter somewhere? (or emitting a NOP at
 > >  > the very end of each function?)
 > > 
 > > We use backtrace() from glibc.  If it's wrong, this is a glibc bug.
 > 
 > Note that with tail call optimization some routines can be skipped in the
 > backtrace. I don't know if this is the case here,

It's not exactly that: it's that throw() is a noreturn function so
there are no insns after "call throw".  when throw() calls backtrace()
the return pc points after the last insn in the fuction that called
throw().

Andrew.