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, 26 insertions, 19 deletions

diff --git a/gdb/c-lang.c b/gdb/c-lang.c
index eb987f4..ce4620a 100644
--- a/gdb/c-lang.c
+++ b/gdb/c-lang.c
@@ -871,11 +871,6 @@ const struct exp_descriptor exp_descriptor_c =
   evaluate_subexp_c
 };
 
-static const char * const c_extensions[] =
-{
-  ".c", NULL
-};
-
 /* Constant data that describes the C language.  */
 
 extern const struct language_data c_language_data =
@@ -885,7 +880,6 @@ extern const struct language_data c_language_data =
   case_sensitive_on,
   array_row_major,
   macro_expansion_c,
-  c_extensions,
   &exp_descriptor_c,
   true,				/* la_store_sym_names_in_linkage_form_p */
   c_op_print_tab,		/* expression operators for printing */
@@ -914,6 +908,14 @@ public:
   { return "C"; }
 
   /* See language.h.  */
+
+  const std::vector<const char *> &filename_extensions () const override
+  {
+    static const std::vector<const char *> extensions = { ".c" };
+    return extensions;
+  }
+
+  /* See language.h.  */
   void language_arch_info (struct gdbarch *gdbarch,
 			   struct language_arch_info *lai) const override
   {
@@ -978,11 +980,6 @@ enum cplus_primitive_types {
   nr_cplus_primitive_types
 };
 
-static const char * const cplus_extensions[] =
-{
-  ".C", ".cc", ".cp", ".cpp", ".cxx", ".c++", NULL
-};
-
 /* Constant data that describes the C++ language.  */
 
 extern const struct language_data cplus_language_data =
@@ -992,7 +989,6 @@ extern const struct language_data cplus_language_data =
   case_sensitive_on,
   array_row_major,
   macro_expansion_c,
-  cplus_extensions,
   &exp_descriptor_c,
   false,			/* la_store_sym_names_in_linkage_form_p */
   c_op_print_tab,		/* expression operators for printing */
@@ -1022,6 +1018,15 @@ public:
 
   /* See language.h.  */
 
+  const std::vector<const char *> &filename_extensions () const override
+  {
+    static const std::vector<const char *> extensions
+      = { ".C", ".cc", ".cp", ".cpp", ".cxx", ".c++" };
+    return extensions;
+  }
+
+  /* See language.h.  */
+
   struct language_pass_by_ref_info pass_by_reference_info
 	(struct type *type) const override
   {
@@ -1187,11 +1192,6 @@ protected:
 
 static cplus_language cplus_language_defn;
 
-static const char * const asm_extensions[] =
-{
-  ".s", ".sx", ".S", NULL
-};
-
 /* Constant data that describes the ASM language.  */
 
 extern const struct language_data asm_language_data =
@@ -1201,7 +1201,6 @@ extern const struct language_data asm_language_data =
   case_sensitive_on,
   array_row_major,
   macro_expansion_c,
-  asm_extensions,
   &exp_descriptor_c,
   true,				/* la_store_sym_names_in_linkage_form_p */
   c_op_print_tab,		/* expression operators for printing */
@@ -1229,6 +1228,15 @@ public:
   const char *natural_name () const override
   { return "Assembly"; }
 
+  /* See language.h.  */
+
+  const std::vector<const char *> &filename_extensions () const override
+  {
+    static const std::vector<const char *> extensions
+      = { ".s", ".sx", ".S" };
+    return extensions;
+  }
+
   /* See language.h.
 
      FIXME: Should this have its own arch info method?  */
@@ -1263,7 +1271,6 @@ extern const struct language_data minimal_language_data =
   case_sensitive_on,
   array_row_major,
   macro_expansion_c,
-  NULL,
   &exp_descriptor_c,
   true,				/* la_store_sym_names_in_linkage_form_p */
   c_op_print_tab,		/* expression operators for printing */