Expanding compunit_symtabs based on conservative text address range

Hi, 

while working on V3 of Python JIT API [1].  This API allows one to
create a new compunit (struct compunit_symtab*) and "add" to existing
obfile. 

I'd like to ensure that this new compunit does not overlaps with
existing ones and I realized that I need to "expand" compunits before
doing this check. 

To avoid simply expand_all_symtabs(), I'm trying to introduce new 
"quick function" - expand_symtabs_maybe_overlapping(objf, start, end) -
to expand those that may overlap prior real check. 

For partial symbol functions this seems to be straightfoward, just
check the range overlaps with [psymtab->text_low (objfile), psymtab-
>text_high (objfile)) range. 

But for dwarf2_base_index_functions I'm at loss. Is there any better
way than expanding all? 

Or maybe there's a better approach to this problem? 

Thanks! Jan


[1]:
https://inbox.sourceware.org/gdb-patches/[email protected]/