Remove old univariant code from rust-lang.c

Since moving Rust enum handling into dwarf2read.c, some old code for
handling univariant enums in rust-lang.c has been obsolete.  This
patch removes this code.

Tested on x86-64 Fedora 26, using rustc 1.23 (1.24 emits incorrect
DWARF for enums and so can't be used for this test).

2018-04-12  Tom Tromey  <tom@tromey.com>

	* rust-lang.c (rust_print_struct_def): Remove univariant code.
	(rust_evaluate_subexp): Likewise.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 66ca520..836ac9e 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2018-04-12  Tom Tromey  <tom@tromey.com>
+
+       * rust-lang.c (rust_print_struct_def): Remove univariant code.
+       (rust_evaluate_subexp): Likewise.
+
 2018-04-12  Pedro Alves  <palves@redhat.com>
 
        * procfs.c (procfs_detach): Make forward declaration's prototype

diff --git a/gdb/rust-lang.c b/gdb/rust-lang.c
index 6e0537f..cf8a15e 100644 (file)
--- a/gdb/rust-lang.c
+++ b/gdb/rust-lang.c
@@ -631,7 +631,6 @@ rust_print_struct_def (struct type *type, const char *varstring,
   bool is_tuple_struct = rust_tuple_struct_type_p (type);
   bool is_tuple = rust_tuple_type_p (type);
   bool is_enum = rust_enum_p (type);
-  bool is_univariant = false;
 
   int enum_discriminant_index = -1;
 
@@ -653,12 +652,6 @@ rust_print_struct_def (struct type *type, const char *varstring,
            = (struct discriminant_info *) discriminant_prop->data.baton;
          enum_discriminant_index = info->discriminant_index;
        }
-      else if (TYPE_CODE (type) == TYPE_CODE_UNION && TYPE_NFIELDS (type) == 1)
-       {
-         /* Probably a univariant enum.  */
-         fputs_filtered ("enum ", stream);
-         is_univariant = true;
-       }
       else if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
        fputs_filtered ("struct ", stream);
       else
@@ -695,19 +688,12 @@ rust_print_struct_def (struct type *type, const char *varstring,
            continue;
          fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
        }
-      else if (is_univariant)
-       {
-         const char *name
-           = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (type, i)));
-         fputs_filtered (name, stream);
-       }
       else if (!is_tuple_struct)
        fprintf_filtered (stream, "%s: ", TYPE_FIELD_NAME (type, i));
 
       rust_internal_print_type (TYPE_FIELD_TYPE (type, i), NULL,
-                               stream,
-                               ((is_enum || is_univariant) ? show : show - 1),
-                               level + 2, flags, is_enum || is_univariant);
+                               stream, (is_enum ? show : show - 1),
+                               level + 2, flags, is_enum);
       if (!for_rust_enum)
        fputs_filtered (",\n", stream);
       else if (i + 1 < TYPE_NFIELDS (type))
@@ -1592,13 +1578,6 @@ rust_evaluate_subexp (struct type *expect_type, struct expression *exp,
 
         type = value_type (lhs);
 
-       /* Treat a univariant union as if it were an enum.  */
-       if (TYPE_CODE (type) == TYPE_CODE_UNION && TYPE_NFIELDS (type) == 1)
-         {
-           lhs = value_primitive_field (lhs, 0, 0, type);
-           type = value_type (lhs);
-         }
-
        if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
          {
            struct type *outer_type = NULL;