http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55693
--- Comment #12 from Aldy Hernandez <aldyh at gcc dot gnu.org> 2013-01-17
18:43:45 UTC ---
BTW, the reason this works when forcing the instrumented path as Torvald
suggested (comment #7) is because when f1() is instrumented, the call to
__cxa_allocate_exception is also instrumented and we actually call:
dyld_stub__ITM_cxa_allocate_exception() -> _ITM_cxa_allocate_exception, which
is defined in libitm/eh_cpp.cc:
void *
_ITM_cxa_allocate_exception (size_t size)
{
void *r = __cxa_allocate_exception (size);
gtm_thr()->cxa_unthrown = r;
return r;
}
Assembly single stepping through the above shows that the call to
__cxa_allocate_exception (through dyld_stub___cxa_allocate_exception) has a
correct stub, not this "return 0" nonsense I describe in comment #10.
