Remove TYPE_TAG_NAME

TYPE_TAG_NAME has been an occasional source of confusion and bugs.  It
seems to me that it is only useful for C and C++ -- but even there,
not so much, because at least with DWARF there doesn't seem to be any
way to wind up with a type where the name and the tag name are both
non-NULL and different.

So, this patch removes TYPE_TAG_NAME entirely.  This should save a
little memory, but more importantly, it simplifies this part of gdb.

A few minor test suite adjustments were needed.  In some situations
the new code does not yield identical output to the old code.

gdb/ChangeLog
2018-06-01  Tom Tromey  <tom@tromey.com>

	* valops.c (enum_constant_from_type, value_namespace_elt)
	(value_maybe_namespace_elt): Update.
	* valarith.c (find_size_for_pointer_math): Update.
	* target-descriptions.c (make_gdb_type): Update.
	* symmisc.c (print_symbol): Update.
	* stabsread.c (define_symbol, read_type)
	(complain_about_struct_wipeout, add_undefined_type)
	(cleanup_undefined_types_1): Update.
	* rust-lang.c (rust_tuple_type_p, rust_slice_type_p)
	(rust_range_type_p, val_print_struct, rust_print_struct_def)
	(rust_internal_print_type, rust_composite_type)
	(rust_evaluate_funcall, rust_evaluate_subexp)
	(rust_inclusive_range_type_p): Update.
	* python/py-type.c (typy_get_tag): Update.
	* p-typeprint.c (pascal_type_print_base): Update.
	* mdebugread.c (parse_symbol, parse_type): Update.
	* m2-typeprint.c (m2_long_set, m2_record_fields, m2_enum):
	Update.
	* guile/scm-type.c (gdbscm_type_tag): Update.
	* go-lang.c (sixg_string_p): Update.
	* gnu-v3-abi.c (build_gdb_vtable_type, build_std_type_info_type):
	Update.
	* gdbtypes.h (struct main_type) <tag_name>: Remove.
	(TYPE_TAG_NAME): Remove.
	* gdbtypes.c (type_name_no_tag): Simplify.
	(check_typedef, check_types_equal, recursive_dump_type)
	(copy_type_recursive, arch_composite_type): Update.
	* f-typeprint.c (f_type_print_base): Update.  Print "Type" prefix
	in summary mode when needed.
	* eval.c (evaluate_funcall): Update.
	* dwarf2read.c (fixup_go_packaging, read_structure_type)
	(process_structure_scope, read_enumeration_type)
	(read_namespace_type, read_module_type, determine_prefix): Update.
	* cp-support.c (inspect_type): Update.
	* coffread.c (process_coff_symbol, decode_base_type): Update.
	* c-varobj.c (c_is_path_expr_parent): Update.
	* c-typeprint.c (c_type_print_base_struct_union): Update.
	(c_type_print_base_1): Update.  Print struct/class/union/enum in
	summary when using C language.
	* ax-gdb.c (gen_struct_ref, gen_namespace_elt)
	(gen_maybe_namespace_elt): Update.
	* ada-lang.c (ada_type_name): Simplify.
	(empty_record, ada_template_to_fixed_record_type_1)
	(template_to_static_fixed_type)
	(to_record_with_fixed_variant_part, ada_check_typedef): Update.

gdb/testsuite/ChangeLog
2018-06-01  Tom Tromey  <tom@tromey.com>

	* gdb.xml/tdesc-regs.exp (load_description): Update expected
	results.
	* gdb.dwarf2/method-ptr.exp: Set language to C++.
	* gdb.dwarf2/member-ptr-forwardref.exp: Set language to C++.
	* gdb.cp/typeid.exp (do_typeid_tests): Update type_re.
	* gdb.base/maint.exp (maint_pass_if): Update.

1 files changed, 7 insertions, 7 deletions

diff --git a/gdb/mdebugread.c b/gdb/mdebugread.c
index eeefb66..98f10b4 100644
--- a/gdb/mdebugread.c
+++ b/gdb/mdebugread.c
@@ -1024,10 +1024,10 @@ parse_symbol (SYMR *sh, union aux_ext *ax, char *ext_sh, int bigend,
 	   (.Fxx or .xxfake or empty) for unnamed struct/union/enums.
 	   Alpha cc puts out an sh->iss of zero for those.  */
 	if (sh->iss == 0 || name[0] == '.' || name[0] == '\0')
-	  TYPE_TAG_NAME (t) = NULL;
+	  TYPE_NAME (t) = NULL;
 	else
-	  TYPE_TAG_NAME (t) = obconcat (&mdebugread_objfile->objfile_obstack,
-					name, (char *) NULL);
+	  TYPE_NAME (t) = obconcat (&mdebugread_objfile->objfile_obstack,
+				    name, (char *) NULL);
 
 	TYPE_CODE (t) = type_code;
 	TYPE_LENGTH (t) = sh->value;
@@ -1687,10 +1687,10 @@ parse_type (int fd, union aux_ext *ax, unsigned int aux_index, int *bs,
 	  /* Do not set the tag name if it is a compiler generated tag name
 	     (.Fxx or .xxfake or empty) for unnamed struct/union/enums.  */
 	  if (name[0] == '.' || name[0] == '\0')
-	    TYPE_TAG_NAME (tp) = NULL;
-	  else if (TYPE_TAG_NAME (tp) == NULL
-		   || strcmp (TYPE_TAG_NAME (tp), name) != 0)
-	    TYPE_TAG_NAME (tp)
+	    TYPE_NAME (tp) = NULL;
+	  else if (TYPE_NAME (tp) == NULL
+		   || strcmp (TYPE_NAME (tp), name) != 0)
+	    TYPE_NAME (tp)
 	      = ((const char *)
 		 obstack_copy0 (&mdebugread_objfile->objfile_obstack,
 				name, strlen (name)));