+2020-06-17  Andrew Burgess  <andrew.burgess@embecosm.com>
+
+       * ada-lang.c (ada_language_data) Delete
+       la_class_name_from_physname initializer.
+       * c-lang.c (c_language_data): Likewise.
+       (cplus_language_data): Likewise.
+       (cplus_language::class_name_from_physname): New member function.
+       (asm_language_data): Delete la_class_name_from_physname
+       initializer.
+       (minimal_language_data): Likewise.
+       * d-lang.c (d_language_data): Likewise.
+       * dwarf2/read.c (guess_partial_die_structure_name): Update to call
+       method on language_defn class.
+       (guess_full_die_structure_name): Likewise.
+       * f-lang.c (f_language_data): Delete la_class_name_from_physname
+       initializer.
+       * go-lang.c (go_language_data): Likewise.
+       * language.c (language_class_name_from_physname): Delete.
+       (unk_lang_class_name): Delete.
+       (unknown_language_data): Delete la_class_name_from_physname
+       initializer.
+       (auto_language_data): Likewise.
+       * language.h (language_data): Delete la_class_name_from_physname
+       field.
+       (language_defn::class_name_from_physname): New function.
+       (language_class_name_from_physname): Delete declaration.
+       * m2-lang.c (m2_language_data): Delete la_class_name_from_physname
+       initializer.
+       * objc-lang.c (objc_language_data): Likewise.
+       * opencl-lang.c (opencl_language_data): Likewise.
+       * p-lang.c (pascal_language_data): Likewise.
+       * rust-lang.c (rust_language_data): Likewise.
+
 2020-06-16  Tom Tromey  <tom@tromey.com>
 
        * tui/tui-data.h (STATUS_NAME): New macro.
 
   NULL,                         /* name_of_this */
   true,                         /* la_store_sym_names_in_linkage_form_p */
   ada_lookup_symbol_nonlocal,   /* Looking up non-local symbols.  */
-  NULL,                         /* Language specific
-                                  class_name_from_physname */
   ada_op_print_tab,             /* expression operators for printing */
   0,                            /* c-style arrays */
   1,                            /* String lower bound */
 
   NULL,                                /* name_of_this */
   true,                                /* la_store_sym_names_in_linkage_form_p */
   basic_lookup_symbol_nonlocal,        /* lookup_symbol_nonlocal */
-  NULL,                                /* Language specific
-                                  class_name_from_physname */
   c_op_print_tab,              /* expression operators for printing */
   1,                           /* c-style arrays */
   0,                           /* String lower bound */
   "this",                       /* name_of_this */
   false,                       /* la_store_sym_names_in_linkage_form_p */
   cp_lookup_symbol_nonlocal,   /* lookup_symbol_nonlocal */
-  cp_class_name_from_physname,  /* Language specific
-                                  class_name_from_physname */
   c_op_print_tab,              /* expression operators for printing */
   1,                           /* c-style arrays */
   0,                           /* String lower bound */
   {
     return cplus_skip_trampoline (fi, pc);
   }
+
+  /* See language.h.  */
+
+  char *class_name_from_physname (const char *physname) const override
+  {
+    return cp_class_name_from_physname (physname);
+  }
 };
 
 /* The single instance of the C++ language class.  */
   NULL,                                /* name_of_this */
   true,                                /* la_store_sym_names_in_linkage_form_p */
   basic_lookup_symbol_nonlocal,        /* lookup_symbol_nonlocal */
-  NULL,                                /* Language specific
-                                  class_name_from_physname */
   c_op_print_tab,              /* expression operators for printing */
   1,                           /* c-style arrays */
   0,                           /* String lower bound */
   NULL,                                /* name_of_this */
   true,                                /* la_store_sym_names_in_linkage_form_p */
   basic_lookup_symbol_nonlocal,        /* lookup_symbol_nonlocal */
-  NULL,                                /* Language specific
-                                  class_name_from_physname */
   c_op_print_tab,              /* expression operators for printing */
   1,                           /* c-style arrays */
   0,                           /* String lower bound */
 
   "this",
   false,                       /* la_store_sym_names_in_linkage_form_p */
   d_lookup_symbol_nonlocal,
-  NULL,                                /* Language specific
-                                  class_name_from_physname.  */
   d_op_print_tab,              /* Expression operators for printing.  */
   1,                           /* C-style arrays.  */
   0,                           /* String lower bound.  */
 
          && child_pdi->linkage_name != NULL)
        {
          gdb::unique_xmalloc_ptr<char> actual_class_name
-           (language_class_name_from_physname (cu->language_defn,
-                                               child_pdi->linkage_name));
+           (cu->language_defn->class_name_from_physname
+            (child_pdi->linkage_name));
          if (actual_class_name != NULL)
            {
              struct objfile *objfile = cu->per_objfile->objfile;
          if (linkage_name != NULL)
            {
              gdb::unique_xmalloc_ptr<char> actual_name
-               (language_class_name_from_physname (cu->language_defn,
-                                                   linkage_name));
+               (cu->language_defn->class_name_from_physname (linkage_name));
              const char *name = NULL;
 
              if (actual_name != NULL)
 
   NULL,                        /* name_of_this */
   false,                       /* la_store_sym_names_in_linkage_form_p */
   cp_lookup_symbol_nonlocal,   /* lookup_symbol_nonlocal */
-  NULL,                                /* Language specific
-                                  class_name_from_physname */
   f_op_print_tab,              /* expression operators for printing */
   0,                           /* arrays are first-class (not c-style) */
   1,                           /* String lower bound */
 
   NULL,                                /* name_of_this */
   false,                       /* la_store_sym_names_in_linkage_form_p */
   basic_lookup_symbol_nonlocal, 
-  NULL,                                /* Language specific
-                                  class_name_from_physname.  */
   go_op_print_tab,             /* Expression operators for printing.  */
   1,                           /* C-style arrays.  */
   0,                           /* String lower bound.  */
 
   return NULL;
 }
 
-/* Return class name from physname or NULL.  */
-char *
-language_class_name_from_physname (const struct language_defn *lang,
-                                  const char *physname)
-{
-  if (lang != NULL && lang->la_class_name_from_physname)
-    return lang->la_class_name_from_physname (physname);
-  return NULL;
-}
-
 /* Return information about whether TYPE should be passed
    (and returned) by reference at the language level.  */
 
           "function unk_lang_value_print called."));
 }
 
-static char *unk_lang_class_name (const char *mangled)
-{
-  return NULL;
-}
-
 static const struct op_print unk_op_print_tab[] =
 {
   {NULL, OP_NULL, PREC_NULL, 0}
   "this",                      /* name_of_this */
   true,                                /* store_sym_names_in_linkage_form_p */
   basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
-  unk_lang_class_name,         /* Language specific
-                                  class_name_from_physname */
   unk_op_print_tab,            /* expression operators for printing */
   1,                           /* c-style arrays */
   0,                           /* String lower bound */
   "this",                      /* name_of_this */
   false,                       /* store_sym_names_in_linkage_form_p */
   basic_lookup_symbol_nonlocal,        /* lookup_symbol_nonlocal */
-  unk_lang_class_name,         /* Language specific
-                                  class_name_from_physname */
   unk_op_print_tab,            /* expression operators for printing */
   1,                           /* c-style arrays */
   0,                           /* String lower bound */
 
        const struct block *,
        const domain_enum);
 
-    /* Return class name of a mangled method name or NULL.  */
-    char *(*la_class_name_from_physname) (const char *physname);
-
     /* Table for printing expressions.  */
 
     const struct op_print *la_op_print_tab;
     return (CORE_ADDR) 0;
   }
 
+  /* Return class name of a mangled method name or NULL.  */
+  virtual char *class_name_from_physname (const char *physname) const
+  {
+    return nullptr;
+  }
+
   /* List of all known languages.  */
   static const struct language_defn *languages[nr_languages];
 };
 extern char *language_demangle (const struct language_defn *current_language, 
                                const char *mangled, int options);
 
-/* Return class name from physname, or NULL.  */
-extern char *language_class_name_from_physname (const struct language_defn *,
-                                               const char *physname);
-
 /* Splitting strings into words.  */
 extern const char *default_word_break_characters (void);
 
 
   NULL,                                /* name_of_this */
   false,                       /* la_store_sym_names_in_linkage_form_p */
   basic_lookup_symbol_nonlocal,        /* lookup_symbol_nonlocal */
-  NULL,                                /* Language specific
-                                  class_name_from_physname */
   m2_op_print_tab,             /* expression operators for printing */
   0,                           /* arrays are first-class (not c-style) */
   0,                           /* String lower bound */
 
   "self",                      /* name_of_this */
   false,                       /* la_store_sym_names_in_linkage_form_p */
   basic_lookup_symbol_nonlocal,        /* lookup_symbol_nonlocal */
-  NULL,                                /* Language specific
-                                  class_name_from_physname */
   objc_op_print_tab,           /* Expression operators for printing */
   1,                           /* C-style arrays */
   0,                           /* String lower bound */
 
   NULL,                         /* name_of_this */
   false,                       /* la_store_sym_names_in_linkage_form_p */
   basic_lookup_symbol_nonlocal,        /* lookup_symbol_nonlocal */
-  NULL,                                /* Language specific
-                                  class_name_from_physname */
   c_op_print_tab,              /* expression operators for printing */
   1,                           /* c-style arrays */
   0,                           /* String lower bound */
 
   "this",                      /* name_of_this */
   false,                       /* la_store_sym_names_in_linkage_form_p */
   basic_lookup_symbol_nonlocal,        /* lookup_symbol_nonlocal */
-  NULL,                                /* Language specific class_name_from_physname */
   pascal_op_print_tab,         /* expression operators for printing */
   1,                           /* c-style arrays */
   0,                           /* String lower bound */
 
   NULL,                                /* name_of_this */
   false,                       /* la_store_sym_names_in_linkage_form_p */
   rust_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
-  NULL,                                /* Language specific
-                                  class_name_from_physname */
   c_op_print_tab,              /* expression operators for printing */
   1,                           /* c-style arrays */
   0,                           /* String lower bound */