Compute cu_name dynamically

We only need cu_name for errors and verbose messages, so it's a waste to
always construct it in focus_on_cu.  It's now built only as-needed.

* dwflpp.cxx (dwflpp::cu_name): Now a method instead of a data member.
  (dwflpp::focus_on_module): No cu_name to clear now.
  (dwflpp::focus_on_cu): No cu_name to set now.
  (dwflpp::declaration_resolve): Adjust to call cu_name() now.
  (dwflpp::iterate_over_functions): Ditto.
* tapsets.cxx (query_cu): Ditto.

1 files changed, 2 insertions, 1 deletions

diff --git a/dwflpp.h b/dwflpp.h
index 08c137c7..1c7c9215 100644
--- a/dwflpp.h
+++ b/dwflpp.h
@@ -170,7 +170,6 @@ struct dwflpp
   Dwarf_Die * cu;
 
   std::string module_name;
-  std::string cu_name;
   std::string function_name;
 
   dwflpp(systemtap_session & session, const std::string& user_module, bool kernel_p);
@@ -183,6 +182,8 @@ struct dwflpp
   void focus_on_cu(Dwarf_Die * c);
   void focus_on_function(Dwarf_Die * f);
 
+  std::string cu_name(void);
+
   Dwarf_Die *query_cu_containing_address(Dwarf_Addr a);
 
   bool module_name_matches(const std::string& pattern);