[Bug cli/29314] New: Invalid space completion for template class function symbols

[Bug cli/29314] New: Invalid space completion for template class function symbols

[macro at orcam dot me.uk]

https://sourceware.org/bugzilla/show_bug.cgi?id=29314

            Bug ID: 29314
           Summary: Invalid space completion for template class function
                    symbols
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: cli
          Assignee: unassigned at sourceware dot org
          Reporter: macro at orcam dot me.uk
  Target Milestone: ---

When debugging `cc1' from GCC 12, which has a huge number of template
class functions, e.g.:

hash_table<action_record_hasher, false, xcallocator>::expand()
hash_table<action_record_hasher, false,
xcallocator>::find_slot_with_hash(action_record* const&, unsigned int,
insert_option)
hash_table<action_record_hasher, false, xcallocator>::~hash_table()
hash_table<addr_hasher, false, xcallocator>::expand()
[1100+ entries follow]

if you try to complete it correctly, it seems to work as expected:

(gdb) break hash_tab<Tab>
(gdb) break hash_table<
(gdb) break hash_table<<Tab><Tab>
Display all 200 possibilities? (y or n)

However if you do it with a space inserted, then you get:

(gdb) break hash_tab <Tab>
(gdb) break hash_tab le<

Further completion stops working at this point, presumably because the
completer now looks for a token starting with "le<", but it shouldn't
have inserted the "le<" part in this place, because after a space it's
not the first argument to the `break' command anymore.

To reproduce run:

$ gdb /path/to/cc1

(having compiled `cc1' with debug info of course; the host/target does
not seem to matter, I have seen it with various configurations) and just
enter the commands above.

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