On Mon, 2013-12-09 at 16:45 +0100, Mark Wielaard wrote:
When dwarf_getlocation_implicit_pointer and dwarf_getlocation_attr
refer to a DIE that doesn't contain a DW_AT_location then don't generate
an error, but return an empty location expression to signal the actual
value pointed to is not available. This isn't invalid DWARF. Also make
sure that __libdw_intern_expression handles empty location expressions.
+2013-12-09 Mark Wielaard <mjw(a)redhat.com>
+
+ * dwarf_getlocation.c (__libdw_intern_expression): Handle empty
+ location expressions.
+ * dwarf_getlocation_attr.c (dwarf_getlocation_attr): When no
+ location found, return empty location expression.
+ * dwarf_getlocation_implicit_pointer.c
+ (dwarf_getlocation_implicit_pointer): Likewise.
+ (__libdw_empty_loc_attr): New internal function.
+ * libdwP.h (__libdw_empty_loc_attr): Define.
After testing varlocs a bit more on random binaries (varlocs now works
in general on anything I throw at it, extracting all location
expressions as expected) and some testing by Josh I have pushed this to
master.