PR3498: speed up pass-2 and pass-3 for kernel offline dwfl module searching

* dwflpp.cxx (dwflpp ctor): Parametrize for user/kernel modes.
  Update callers.
  (dwfl_report_offline_predicate): New function.  Filter and
  abort searches early if possible.
  (setup_kernel): Use new predicate.
* dwflpp.h: Corresponding changes.
* tapsets.cxx (dwfl_report_offline_predicate): Remove this shared
  implementation.
  (dwarf_builder): Turn kern_dw into module_name->dwflpp* map, just
  like user_dw.
  (get_kern_dw): Adapt.
  (dwarf_build_no_more): Adapt.
* tapsets.h: Remove old shared predicate.
* translate.cxx (dwfl_report_offline_predicate2): New function.
  Filter and abort searches early if possible.
  (emit_symbol_data): Use it.

1 files changed, 2 insertions, 2 deletions

diff --git a/dwflpp.h b/dwflpp.h
index ec6c5a0c..d6d97cd0 100644
--- a/dwflpp.h
+++ b/dwflpp.h
@@ -166,7 +166,7 @@ struct dwflpp
   std::string cu_name;
   std::string function_name;
 
-  dwflpp(systemtap_session & session, const std::string& user_module="");
+  dwflpp(systemtap_session & session, const std::string& user_module, bool kernel_p);
   ~dwflpp();
 
   void get_module_dwarf(bool required = false, bool report = true);
@@ -280,7 +280,7 @@ private:
   Dwarf * module_dwarf;
   Dwarf_Die * function;
 
-  void setup_kernel(bool debuginfo_needed = true);
+  void setup_kernel(const std::string& module_name, bool debuginfo_needed = true);
   void setup_user(const std::string& module_name, bool debuginfo_needed = true);
 
   typedef std::map<Dwarf*, std::vector<Dwarf_Die>*> module_cu_cache_t;