Rewrite registry.h

This rewrites registry.h, removing all the macros and replacing it
with relatively ordinary template classes.  The result is less code
than the previous setup.  It replaces large macros with a relatively
straightforward C++ class, and now manages its own cleanup.

The existing type-safe "key" class is replaced with the equivalent
template class.  This approach ended up requiring relatively few
changes to the users of the registry code in gdb -- code using the key
system just required a small change to the key's declaration.

All existing users of the old C-like API are now converted to use the
type-safe API.  This mostly involved changing explicit deletion
functions to be an operator() in a deleter class.

The old "save/free" two-phase process is removed, and replaced with a
single "free" phase.  No existing code used both phases.

The old "free" callbacks took a parameter for the enclosing container
object.  However, this wasn't truly needed and is removed here as
well.

1 files changed, 1 insertions, 6 deletions

diff --git a/gdb/inferior.h b/gdb/inferior.h
index c376d78..0178001 100644
--- a/gdb/inferior.h
+++ b/gdb/inferior.h
@@ -595,7 +595,7 @@ public:
   displaced_step_inferior_state displaced_step_state;
 
   /* Per inferior data-pointers required by other GDB modules.  */
-  REGISTRY_FIELDS;
+  registry<inferior> registry_fields;
 
 private:
   /* The inferior's target stack.  */
@@ -615,11 +615,6 @@ private:
   std::string m_cwd;
 };
 
-/* Keep a registry of per-inferior data-pointers required by other GDB
-   modules.  */
-
-DECLARE_REGISTRY (inferior);
-
 /* Add an inferior to the inferior list, print a message that a new
    inferior is found, and return the pointer to the new inferior.
    Caller may use this pointer to initialize the private inferior