gdb: Convert language la_demangle field to a method

This commit changes the language_data::la_demangle function pointer
member variable into a member function of language_defn.

The only slightly "weird" change in this commit is in f-lang.c, where
I have given the Fortran language a demangle method that is identical
to the default language_defn::demangle.  The only reason for this is
to give me somewhere to copy the comment that was previously embedded
within the f_language_data structure.

There should be no user visible changes after this commit.

gdb/ChangeLog:

	* ada-lang.c (ada_language_data): Delete la_demangle initializer.
	(ada_language::demangle): New member function.
	* c-lang.c (c_language_data): Delete la_demangle initializer.
	(cplus_language_data): Delete la_demangle initializer.
	(cplus_language::demangle): New member function.
	(asm_language_data): Delete la_demangle initializer.
	(minimal_language_data): Delete la_demangle initializer.
	* d-lang.c (d_language_data): Delete la_demangle initializer.
	(d_language::demangle): New member function.
	* f-lang.c (f_language_data): Delete la_demangle initializer.
	(f_language::demangle): New member function.
	* go-lang.c (go_language_data): Delete la_demangle initializer.
	(go_language::demangle): New member function.
	* language.c (language_demangle): Update.
	(unk_lang_demangle): Delete.
	(unknown_language_data): Delete la_demangle initializer.
	(unknown_language::demangle): New member function.
	(auto_language_data): Delete la_demangle initializer.
	(auto_language::demangle): New member function.
	* language.h (language_data): Delete la_demangle field.
	(language_defn::demangle): New function.
	* m2-lang.c (m2_language_data): Delete la_demangle initializer.
	* objc-lang.c (objc_language_data): Delete la_demangle
	initializer.
	(objc_language::demangle): New member function.
	* opencl-lang.c (opencl_language_data): Delete la_demangle
	initializer.
	* p-lang.c (pascal_language_data): Likewise.
	* rust-lang.c (rust_language_data): Likewise.
	(rust_language::demangle): New member functi

1 files changed, 12 insertions, 7 deletions

diff --git a/gdb/f-lang.c b/gdb/f-lang.c
index 1b0fec6..bd5f78c 100644
--- a/gdb/f-lang.c
+++ b/gdb/f-lang.c
@@ -615,13 +615,6 @@ extern const struct language_data f_language_data =
   NULL,                    	/* name_of_this */
   false,			/* la_store_sym_names_in_linkage_form_p */
   cp_lookup_symbol_nonlocal,	/* lookup_symbol_nonlocal */
-
-  /* We could support demangling here to provide module namespaces
-     also for inferiors with only minimal symbol table (ELF symbols).
-     Just the mangling standard is not standardized across compilers
-     and there is no DW_AT_producer available for inferiors with only
-     the ELF symbols to check the mangling kind.  */
-  NULL,				/* Language specific symbol demangler */
   NULL,				/* Language specific
 				   class_name_from_physname */
   f_op_print_tab,		/* expression operators for printing */
@@ -692,6 +685,18 @@ public:
 
   /* See language.h.  */
 
+  char *demangle (const char *mangled, int options) const override
+  {
+      /* We could support demangling here to provide module namespaces
+	 also for inferiors with only minimal symbol table (ELF symbols).
+	 Just the mangling standard is not standardized across compilers
+	 and there is no DW_AT_producer available for inferiors with only
+	 the ELF symbols to check the mangling kind.  */
+    return nullptr;
+  }
+
+  /* See language.h.  */
+
   void print_type (struct type *type, const char *varstring,
 		   struct ui_file *stream, int show, int level,
 		   const struct type_print_options *flags) const override