Remove ALL_SO_LIBS and so_list_head

This patch started as an attempt to replace ALL_SO_LIBS with an
ordinary C++ iterator.  However, then I tripped over the so_list_head
define again, and decided to remove it as well.

gdb/ChangeLog
2020-05-08  Tom Tromey  <tom@tromey.com>

	* mi/mi-cmd-file.c (mi_cmd_file_list_shared_libraries): Update.
	* solib-svr4.c (svr4_fetch_objfile_link_map): Update.
	(enable_break): Update.
	* solib-frv.c (frv_fdpic_find_global_pointer): Update.
	(frv_fdpic_find_canonical_descriptor): Update.
	(frv_fetch_objfile_link_map): Update.
	* progspace.c (program_space::free_all_objfiles): Update.
	(program_space::solibs): New method.
	* progspace.h (struct program_space) <solibs>: New method.
	* solist.h (master_so_list): Don't declare.
	(ALL_SO_LIBS): Remove.
	* solib.h (so_list_head): Remove.
	(update_solib_list): Update comment.
	* solib.c (master_so_list): Remove.
	(solib_used, update_solib_list, solib_add)
	(info_sharedlibrary_command, clear_solib)
	(reload_shared_libraries_1, remove_user_added_objfile): Update.

1 files changed, 7 insertions, 0 deletions

diff --git a/gdb/progspace.h b/gdb/progspace.h
index 2b88784..0e32224 100644
--- a/gdb/progspace.h
+++ b/gdb/progspace.h
@@ -37,6 +37,7 @@ struct exec;
 struct address_space;
 struct program_space_data;
 struct address_space_data;
+struct so_list;
 
 typedef std::list<std::shared_ptr<objfile>> objfile_list;
 
@@ -264,6 +265,12 @@ struct program_space
   /* Free all the objfiles associated with this program space.  */
   void free_all_objfiles ();
 
+  /* Return a range adapter for iterating over all the solibs in this
+     program space.  Use it like:
+
+     for (so_list *so : pspace->solibs ()) { ... }  */
+  next_adapter<struct so_list> solibs () const;
+
 
   /* Pointer to next in linked list.  */
   struct program_space *next = NULL;