DIP 1029---Add throw as Function Attribute---Community Review Round 1
aldacron at gmail.com
Thu Jan 16 01:07:18 UTC 2020
On Wednesday, 15 January 2020 at 19:25:23 UTC, Ola Fosheim
> On Wednesday, 15 January 2020 at 18:20:00 UTC, H. S. Teoh wrote:
>> As I already pointed out in another thread, I suspect that
>> Walter's beef against exceptions is not really the exceptions
>> themselves, but their *current implementation* in the form of
>> mandatory stack frames and their associated setup, and stack
>> unwinding which is unwieldy to implement and expensive at
>> runtime to execute.
> If that was the case then he would have suggested to fix the
> implementation, not the default...
> You certainly can fix exception performance in the
> implementation with inter-procedural analysis.
>> Elsewhere in said other thread we've already come up with a
>> potential alternative implementation that still allows you to
>> throw errors -- just in a more lightweight form that doesn't
>> require expensive stack frame setup and unwieldy stack
>> unwinding code. At the user code level, it could even retain
>> exactly the same syntax, and work pretty much the same as
>> before, just the actual implementation will follow a different
> D needs to use the same unwind code as C++ if it is going to
> integrate well with C++.
> If C++ interop is the goal then D has to focus on aligning its
> semantics with C++... obviously.
Please everyone, let’s keep this thread focused on reviewing this
DIP. There is another thread discussing default nothrow. Any
further off topic posts in this thread will be deleted.
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