Florian Weimer wrote: > * Andrew Haley: > >> Florian Weimer wrote: >>> Under what circumstances is it possible to throw a C++ exception from >>> a signal handler? (I'm most interested in GNU/Linux with libc 2.7 and >>> later.) >> It depends on the architecture, but we have support on x86 and a bunch >> of others. Compile with -fnon-call-exceptions. > > How does this affect code generation? It doesn't affect the code very much, but it does generate a good deal more unwinder data. It affects instruction combination: obviously, if an instruction may trap, then you can't combine it with its successor. It also affects anything that involves memory accesses: if writes may trap, you can't reorder them. grep for flag_non_call_exceptions in the source and you'll see the differences. Andrew.
