gdb: Convert la_filename_extensions to a method

Convert language_data::la_filename_extensions member variable to a
virtual method language_defn::filename_extensions.

The new method returns a vector of filename extensions, which means
that where previously we needed a NULL marker on the end of the list,
we can now discard this.

All of the old arrays that contained the extensions now become static
data within each languages filename_extensions method.

I've updated the single use of the filename_extensions method to make
use of this method returning a vector.  And, just in case anyone
accidentally adds a NULL marked into a languages extensions list, I've
added a new assert in add_filename_language (symtab.c) to catch this.

gdb/ChangeLog:

	* ada-lang.c (ada_extensions): Delete, moved into
	ada_language::filename_extensions.
	(ada_language_data): Remove la_filename_extensions initializer.
	(ada_language::filename_extensions): New member function.
	* c-lang.c (c_extensions): Delete, moved into
	c_language::filename_extensions.
	(c_language_data): Remove la_filename_extensions initializer.
	(c_language::filename_extensions): New member function.
	(cplus_extensions): Delete, moved into
	cplus_language::filename_extensions.
	(cplus_language_data): Remove la_filename_extensions initializer.
	(cplus_language::filename_extensions): New member function.
	(asm_extensions): Delete, moved into
	asm_language::filename_extensions.
	(asm_language_data): Remove la_filename_extensions initializer.
	(asm_language::filename_extensions): New member function.
	(minimal_language_data): Remove la_filename_extensions
	initializer.
	* d-lang.c (d_extensions): Delete, moved into
	d_language::filename_extensions.
	(d_language_data): Remove la_filename_extensions initializer.
	(d_language::filename_extensions): New member function.
	* f-lang.c (f_extensions): Delete, moved into
	f_language::filename_extensions.
	(f_language_data): Remove la_filename_extensions initializer.
	(f_language::filename_extensions): New member function.
	* go-lang.c (go_language_data): Remove la_filename_extensions
	initializer.
	* language.c (add_set_language_command): Update now that
	filename_extensions returns a vector.
	(unknown_language_data): Remove la_filename_extensions
	initializer.
	(auto_language_data): Likewise.
	* language.h (language_data): Remove la_filename_extensions field.
	(language_defn::filename_extensions): New member function.
	* m2-lang.c (m2_language_data): Remove la_filename_extensions
	initializer.
	* objc-lang.c (objc_extensions): Delete, moved into
	objc_language::filename_extensions.
	(objc_language_data): Remove la_filename_extensions initializer.
	(objc_language::filename_extensions): New member function.
	* opencl-lang.c (opencl_language_data): Remove
	la_filename_extensions initializer.
	* p-lang.c (pascal_extensions): Delete, moved into
	pascal_language::filename_extensions.
	(pascal_language_data): Remove la_filename_extensions initializer.
	(pascal_language::filename_extensions): New member function.
	* rust-lang.c (rust_extensions): Delete, moved into
	rust_language::filename_extensions.
	(rust_language_data): Remove la_filename_extensions initializer.
	(rust_language::filename_extensions): New member function.
	* symfile.c (add_filename_language): Add new assert.

1 files changed, 9 insertions, 6 deletions

diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index fd9e6d3..b9cd9a3 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -13704,11 +13704,6 @@ ada_get_symbol_name_matcher (const lookup_name_info &lookup_name)
     }
 }
 
-static const char * const ada_extensions[] =
-{
-  ".adb", ".ads", ".a", ".ada", ".dg", NULL
-};
-
 /* Constant data that describes the Ada language.  */
 
 extern const struct language_data ada_language_data =
@@ -13719,7 +13714,6 @@ extern const struct language_data ada_language_data =
                                    that's not quite what this means.  */
   array_row_major,
   macro_expansion_no,
-  ada_extensions,
   &ada_exp_descriptor,
   true,                         /* la_store_sym_names_in_linkage_form_p */
   ada_op_print_tab,             /* expression operators for printing */
@@ -13747,6 +13741,15 @@ public:
   const char *natural_name () const override
   { return "Ada"; }
 
+  /* See language.h.  */
+
+  const std::vector<const char *> &filename_extensions () const override
+  {
+    static const std::vector<const char *> extensions
+      = { ".adb", ".ads", ".a", ".ada", ".dg" };
+    return extensions;
+  }
+
   /* Print an array element index using the Ada syntax.  */
 
   void print_array_index (struct type *index_type,