https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84620
Bug ID: 84620
Summary: DW_AT_GNU_entry_view should not use address class
forms, but constant forms
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: mark at gcc dot gnu.org
CC: aoliva at gcc dot gnu.org
Target Milestone: ---
In some situations gcc will emit the view index in DWARF as a DW_FORM_addr (or
DW_FORM_GNU_addr_index). This is confusing to DWARF consumers which might
process address class attributes specially. A view number really is a constant
class attribute. Ideally it should use DW_FORM_udata. But if a constant sized
form is needed, it could also use DW_FORM_data1, DW_FORM_data2, DW_FORM_data4
or
DW_FORM_data8.
The issue seems to come from gcc dwarf2out.c internally using
dw_val_class_lbl_id, which seems to be used for the special DW_AT_high_pc case
where it could be either an address or an (constant) offset from low_pc (so it
can be represented either as address class or constant class).
It seems view numbers are always constant class and so should use a different
(or new) dw_val_class in dwarf2out.
