New "iterate_over_objfiles_in_search_order" gdbarch method.

This patch introduces the "iterate_over_objfiles_in_search_order"
gdbarch method, as well as its default implementation, and converts
the areas where it will matter to using this gdbarch method.

The default method implementation is the only one installed, and
the changes should have no functional impact in terms of behavior.
This only paves the way for the architectures that will need their
own version.

gdb/ChangeLog:

        * gdbarch.sh: Add generation of
        "iterate_over_objfiles_in_search_order_cb_ftype" typedef in
        gdbarch.h.  Add include of "objfiles.h" in gdbarch.c.
        (iterate_over_objfiles_in_search_order): New gdbarch method.
        * gdbarch.h, gdbarch.c: Regenerate.
        * objfiles.h (default_iterate_over_objfiles_in_search_order):
        Add declaration.
        * objfiles.c (default_iterate_over_objfiles_in_search_order):
        New function.
        * symtab.c (lookup_symbol_aux_objfile): New function, extracted
        out of lookup_symbol_aux_symtabs.
        (lookup_symbol_aux_symtabs): Replace extracted-out code by
        call to lookup_symbol_aux_objfile.
        (struct global_sym_lookup_data): New type.
        (lookup_symbol_global_iterator_cb): New function.
        (lookup_symbol_global): Search for symbol using
        gdbarch_iterate_over_objfiles_in_search_order and
        lookup_symbol_global_iterator_cb.
        * findvar.c (struct minsym_lookup_data): New type.
        (minsym_lookup_iterator_cb): New function.
        (default_read_var_value) [case LOC_UNRESOLVED]: Resolve the
        symbol's address via gdbarch_iterate_over_objfiles_in_search_order
        and minsym_lookup_iterator_cb.

1 files changed, 25 insertions, 0 deletions

diff --git a/gdb/objfiles.c b/gdb/objfiles.c
index 8d9f8a5..f5e5c75 100644
--- a/gdb/objfiles.c
+++ b/gdb/objfiles.c
@@ -1525,6 +1525,31 @@ gdb_bfd_unref (struct bfd *abfd)
   xfree (name);
 }
 
+/* The default implementation for the "iterate_over_objfiles_in_search_order"
+   gdbarch method.  It is equivalent to use the ALL_OBJFILES macro,
+   searching the objfiles in the order they are stored internally,
+   ignoring CURRENT_OBJFILE.
+
+   On most platorms, it should be close enough to doing the best
+   we can without some knowledge specific to the architecture.  */
+
+void
+default_iterate_over_objfiles_in_search_order
+  (struct gdbarch *gdbarch,
+   iterate_over_objfiles_in_search_order_cb_ftype *cb,
+   void *cb_data, struct objfile *current_objfile)
+{
+  int stop = 0;
+  struct objfile *objfile;
+
+  ALL_OBJFILES (objfile)
+    {
+       stop = cb (objfile, cb_data);
+       if (stop)
+	 return;
+    }
+}
+
 /* Provide a prototype to silence -Wmissing-prototypes.  */
 extern initialize_file_ftype _initialize_objfiles;