[Bug symtab/30164] New: Restructure symbol domains

["tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30164

            Bug ID: 30164
           Summary: Restructure symbol domains
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
  Target Milestone: ---

Right now, symbol domains generally follow C.
That is, there is a domain for tags, some for non-C things
(Fortran stuff), a domain for labels, and then VAR_DOMAIN
for everything else -- types, functions, variables.

This leads to bad results, like bug #30158, where an
attempt to look up a function instead finds a namespace.

I think it would be better to drastically overhaul this code.
There should be many more domains, as many as we think
we'll need.  Types, variables, and functions should all
be separate.  Probably namespaces should also be their own thing.

Then, the symbol lookup functions should accept an enum flag
type of all the domains that should be searched.
This way, the C parser can implement its own semantics by
searching the relevant C domains -- but other language parsers
can do as they like.

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