bounds checking and traps

[Zack Weinberg]

"Jan Beulich" <JBeulich@novell.com> writes:

>>These are standard named patterns.  Grep for "gen_trap", and note where
>
>>it is called.
>
> I did exactly that, and didn't find any meaningful references (as I
> said before, folloiwng the call tree, TRAP_IF must be found somewhere in
> order for gen_trap [or gen_conditional_trap] to be called, but I wasn't
> able to find anything anywhere that would actually set TRAP_IF).

Look for the code implementing __builtin_trap().

>>Yes, this may need to be OS dependent.
>
> But then this can't be OS-independent (i386.md) code.

i386.md can certainly contain OS-conditionalized code, if necessary,
but I think the problem is with your OS - this might as well be part
of the i386 ABI.

zw