https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119711
Bug ID: 119711
Summary: dw_attr_struct and dw_loc_descr_node are wasteful with
padding
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
Target Milestone: ---
typedef struct GTY(()) dw_attr_struct {
enum dwarf_attribute dw_attr;
dw_val_node dw_attr_val;
}
dw_attr_node;
struct GTY(()) dw_val_node {
enum dw_val_class val_class;
struct addr_table_entry * GTY(()) val_entry;
union dw_val_struct_union
{
...
GTY ((desc ("%1.val_class"))) v;
};
there's two 4 byte holes after the enums, the whole thing is 40 bytes instead
of 32. It's also dw_val_node::val_entry is only ever != NULL with
-gsplit-dwarf.
dw_loc_descr_node has pointer, then 8+1+1 bitfields, then
int dw_loc_addr and then 2 dw_val_node elts.
At least naming the padding in dw_val_node for outside use can improve things.
