Create a dwarf_attr_die idiom

We commonly do a dwarf_attr_integrate followed by dwarf_formref_die,
with no care for the Dwarf_Attribute, so I captured that idiom in an
inline function.

* dwarf_wrappers.h (dwarf_attr_die): New.
* dwarf_wrappers.cxx (dwarf_type_name): Call dwarf_attr_die.
* dwflpp.cxx (dwflpp::print_members): Ditto.
  (dwflpp::find_struct_member): Ditto.
* tapsets.cxx (dwarf_derived_probe::saveargs): Ditto.
  (uprobe_derived_probe::saveargs): Ditto.
  (resolve_tracepoint_arg_type): Ditto.
  (tracepoint_derived_probe::build_args): Ditto.

1 files changed, 10 insertions, 0 deletions

diff --git a/dwarf_wrappers.h b/dwarf_wrappers.h
index bc1cde2b..766abb6d 100644
--- a/dwarf_wrappers.h
+++ b/dwarf_wrappers.h
@@ -103,6 +103,16 @@ public:
 };
 
 
+// Look up the DIE for a reference-form attribute name
+inline Dwarf_Die *
+dwarf_attr_die (Dwarf_Die *die, unsigned int attr, Dwarf_Die *result)
+{
+  Dwarf_Attribute attr_mem;
+  return dwarf_formref_die (dwarf_attr_integrate (die, attr, &attr_mem),
+                            result);
+}
+
+
 #if !_ELFUTILS_PREREQ(0, 143)
 // Elfutils prior to 0.143 didn't use attr_integrate when looking up the
 // decl_file or decl_line, so the attributes would sometimes be missed.  For