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, 2 insertions, 8 deletions

diff --git a/gdb/language.c b/gdb/language.c
index 0b1b488..cc40762 100644
--- a/gdb/language.c
+++ b/gdb/language.c
@@ -503,12 +503,8 @@ add_set_language_command ()
 
   /* Add the filename extensions.  */
   for (const auto &lang : language_defn::languages)
-    if (lang->la_filename_extensions != NULL)
-      {
-	for (size_t i = 0; lang->la_filename_extensions[i] != NULL; ++i)
-	  add_filename_language (lang->la_filename_extensions[i],
-				 lang->la_language);
-      }
+    for (const char * const &ext : lang->filename_extensions ())
+      add_filename_language (ext, lang->la_language);
 
   /* Build the "help set language" docs.  */
   string_file doc;
@@ -784,7 +780,6 @@ extern const struct language_data unknown_language_data =
   case_sensitive_on,
   array_row_major,
   macro_expansion_no,
-  NULL,
   &exp_descriptor_standard,
   true,				/* store_sym_names_in_linkage_form_p */
   unk_op_print_tab,		/* expression operators for printing */
@@ -921,7 +916,6 @@ extern const struct language_data auto_language_data =
   case_sensitive_on,
   array_row_major,
   macro_expansion_no,
-  NULL,
   &exp_descriptor_standard,
   false,			/* store_sym_names_in_linkage_form_p */
   unk_op_print_tab,		/* expression operators for printing */