"David G. Johnston" <david.g.johnston@xxxxxxxxx> writes:
> On Thu, Mar 20, 2025 at 11:54 AM Tom Lane <tgl@xxxxxxxxxxxxx> wrote:
>> I think it's a mistake to suppose that pg_type_d.h is the only
>> place where there's a risk of confusion. We should be thinking
>> about this more generally: genbki.pl is taking zero thought to
>> make what it emits readable. I think it would help to
>> label the sections it emits, perhaps along the lines of
>> /* Auto-generated OID macros */
> I'd consider this enough for the moment, so long as we explicitly address
> the cross-version constancy of the OID values associated with each type.
That's documented elsewhere, I believe. For the foo_d.h files,
I think it'd be sufficient to do something like 0001 attached.
Also, while checking out the results, I noticed that pg_class.h
has an "extern" in the wrong place: it's exposed to client code
which can have no use for it. That extern doesn't mention any
backend-only typedefs, so it's fairly harmless, but it's still
a clear example of somebody not reading the memo. Hence 0002.
> I'm not going to dive deep enough to make more targeted suggestions. It
> does seem, though, that "client code" would seem mostly interested in these
> OIDs and not stuff like the attribute numbers of the columns in pg_type. I
> get a distinct feel of one file serving multiple use cases.
Well, yes it does, but that doesn't make those symbols useless to
client code.
regards, tom lane
diff --git a/src/backend/catalog/genbki.pl b/src/backend/catalog/genbki.pl
index 2501307c92e..df3231fcd41 100644
--- a/src/backend/catalog/genbki.pl
+++ b/src/backend/catalog/genbki.pl
@@ -480,6 +480,8 @@ foreach my $catname (@catnames)
EOM
+ printf $def "/* Macros related to the structure of $catname */\n\n";
+
# Emit OID macros for catalog's OID and rowtype OID, if wanted
printf $def "#define %s %s\n",
$catalog->{relation_oid_macro}, $catalog->{relation_oid}
@@ -561,6 +563,7 @@ EOM
print $def "\n#define Natts_$catname $attnum\n\n";
# Emit client code copied from source header
+ printf $def "/* Definitions copied from ${catname}.h */\n\n";
foreach my $line (@{ $catalog->{client_code} })
{
print $def $line;
@@ -573,6 +576,9 @@ EOM
print $bki "open $catname\n";
}
+ printf $def
+ "\n/* OID symbols for objects defined in ${catname}.dat */\n\n";
+
# For pg_attribute.h, we generate data entries ourselves.
if ($catname eq 'pg_attribute')
{
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index fa96ba07bf4..07d182da796 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -231,8 +231,8 @@ MAKE_SYSCACHE(RELNAMENSP, pg_class_relname_nsp_index, 128);
(relkind) == RELKIND_TOASTVALUE || \
(relkind) == RELKIND_MATVIEW)
-extern int errdetail_relkind_not_supported(char relkind);
-
#endif /* EXPOSE_TO_CLIENT_CODE */
+extern int errdetail_relkind_not_supported(char relkind);
+
#endif /* PG_CLASS_H */
