[Bug middle-end/82546] New: tree_size handling for TYPE nodes is confused

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82546

            Bug ID: 82546
           Summary: tree_size handling for TYPE nodes is confused
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: nathan at gcc dot gnu.org
  Target Milestone: ---

In working on the modules branch I discovered TYPE node size determination is
messed up.

tree_code_size returns sizeof (tree_type_non_common) for all tcc_type nodes.
Not even asking the lang hook for lang extension types.

1) I don't know whether some core types are smaller

2) some lang hooks don't return sizes for types

3) some lang hooks return too-small-a size

4) some langs don't correctly mark the hierarchy matrix -- how GC is working
here I'm not sure.  We may be lucking out with nodes being reachable via other
ways?

5) All our nice tree_type_common, tree_type_with_lang_specific and
tree_type_non_common size optimization is not being used.