Adding PRIMARY KEY info

I tried adding the PRIMARY KEY info to pg_class but the resulting data
base system simply dumps core everywhere. Can someone point me to the
areas that need to be addressed? Here's what I did. I added a field
called "relprimary" to pg_class in pg_class.h as type Oid then added
-1 to the pg_class entries in the appropriate place. I would also like
to figure out the oid of the keys for each system table if someone can
point me to those as well.

The next step, of course, is to turn PRIMARY KEY statements into an
update to the class table to insert the oid of the KEY field. I looked
at parser/analyze.c but I think I have to look deeper. Any help?

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