This fixes various instances of ICEs in dwarf2out_finish when
processing the limbo DIE list. With LTO we can end up with
limbos with RECORD_TYPE context for example when we partitioned
away record-local statics and nothing references the record
type itself.
In general it seems safe to not expose LTO (with it's semi-broken
debug information support) to this kind of sanity check in
limbo DIE processing (I've done some real fixes in this
area lately, but some are really hard to tackle if we do not
want to make partitioning dependent on dwarf2out internals - we
feed dwarf2out with types/decls in sometimes unpredicted order).
Another kind of fix that crossed my mind would be iterating
over the limbo list repeatedly and emitting origins there
on-the-fly, but not sure if we'd not run into more issues that way.
LTO bootstrapped and tested on x86_64-unknown-linux-gnu.
This seems to be the last ICE caused by a LTO mozilla build with -g.
Ok for trunk?
Thanks,
Richard.
2012-01-02 Richard Guenther <rguent...@suse.de>
PR debug/51650
* dwarf2out.c (dwarf2out_finish): When processing LTO IL
allow any kind of parents for limbo DIEs.
Index: gcc/dwarf2out.c
===================================================================
--- gcc/dwarf2out.c (revision 182784)
+++ gcc/dwarf2out.c (working copy)
@@ -22501,15 +22501,22 @@ dwarf2out_finish (const char *filename)
else if (TYPE_P (node->created_for))
context = TYPE_CONTEXT (node->created_for);
- gcc_assert (context
- && (TREE_CODE (context) == FUNCTION_DECL
- || TREE_CODE (context) == NAMESPACE_DECL));
+ /* With LTO we can end up with limbo DIEs with parents
+ we never output due to partitioning being done
+ unaware of things like class-scope statics or functions. */
+ gcc_assert (in_lto_p
+ || (context
+ && (TREE_CODE (context) == FUNCTION_DECL
+ || TREE_CODE (context) == NAMESPACE_DECL)));
- origin = lookup_decl_die (context);
+ if (context)
+ origin = lookup_decl_die (context);
+ else
+ origin = comp_unit_die ();
if (origin)
- add_child_die (origin, die);
+ add_child_die (origin, die);
else
- add_child_die (comp_unit_die (), die);
+ add_child_die (comp_unit_die (), die);
}
}
}
