On 09/05/18 18:07, Tom Lane wrote:
> * Replace SPI_tuptable et al with macros that access fields in the
> current SPI stack level (similar to the way that, eg, errno works
> on most modern platforms). This seems do-able, if a bit grotty.
It would mean they'd have to *be* in the stack frame, where they
currently aren't; they're ignored by SPI_connect and just zeroed
by SPI_finish, on the grounds that they're transient and you've
copied them if you care.
Another alternative might be to have SPI_connect save them and
SPI_finish put them back, which leaves you just responsible for
reasoning about your own code. You'd still be expected to save them
across your own uses of other SPI calls, but no longer exposed to
spooky action at a distance from nested uses of SPI in stuff you call.
-Chap