Cache Dwfl's for reuse between pass 2 and pass 3.

* setupdwfl.h: Introduce DwflPtr.
* setupdwfl.cxx: Cache kernel_dwfl and user_dwfl. Keep track of last used
  module strings. Return cached versions if same query used.
* dwflpp.h: Use DwflPtr instead of Dwfl*.
* dwflpp.cxx: Use DwflPtr and don't dwfl_end().
* translate.cxx: Likewise. Run through dwfl_getmodules() with returned
  ptr offset.

1 files changed, 2 insertions, 1 deletions

diff --git a/dwflpp.h b/dwflpp.h
index 979ec868..226b84d8 100644
--- a/dwflpp.h
+++ b/dwflpp.h
@@ -16,6 +16,7 @@
 #include "elaborate.h"
 #include "session.h"
 #include "unordered.h"
+#include "setupdwfl.h"
 
 #include <cstring>
 #include <iostream>
@@ -286,7 +287,7 @@ struct dwflpp
 
 
 private:
-  Dwfl * dwfl;
+  DwflPtr dwfl_ptr;
 
   // These are "current" values we focus on.
   Dwarf * module_dwarf;