widl: Use the type_type field to track whether the type is an alias.

tools/widl/typetree.c

@@ -59,7 +59,6 @@ type_t *make_type(enum type_type type)
     t->user_types_registered = FALSE;
     t->tfswrite = FALSE;
     t->checked = FALSE;
-    t->is_alias = FALSE;
     t->typelib_idx = -1;
     init_loc_info(&t->loc_info);
     return t;
@@ -188,12 +187,11 @@ type_t *type_new_pointer(unsigned char pointer_default, type_t *ref, attr_list_t
 
 type_t *type_new_alias(type_t *t, const char *name)
 {
-    type_t *a = duptype(t, 0);
+    type_t *a = make_type(TYPE_ALIAS);
 
     a->name = xstrdup(name);
     a->attrs = NULL;
     a->orig = t;
-    a->is_alias = TRUE;
     /* for pointer types */
     a->details = t->details;
     init_loc_info(&a->loc_info);

tools/widl/typetree.h

@@ -59,7 +59,7 @@ type_t *duptype(type_t *t, int dupname);
 /* un-alias the type until finding the non-alias type */
 static inline type_t *type_get_real_type(const type_t *type)
 {
-    if (type->is_alias)
+    if (type->type_type == TYPE_ALIAS)
         return type_get_real_type(type->orig);
     else
         return (type_t *)type;
@@ -299,7 +299,7 @@ static inline unsigned char type_array_get_ptr_default_fc(const type_t *type)
 
 static inline int type_is_alias(const type_t *type)
 {
-    return type->is_alias;
+    return type->type_type == TYPE_ALIAS;
 }
 
 static inline type_t *type_alias_get_aliasee(const type_t *type)

tools/widl/widltypes.h

@@ -451,7 +451,6 @@ struct _type_t {
   unsigned int user_types_registered : 1;
   unsigned int tfswrite : 1;   /* if the type needs to be written to the TFS */
   unsigned int checked : 1;
-  unsigned int is_alias : 1; /* is the type an alias? */
 };
 
 struct _var_t {
@@ -593,8 +592,6 @@ char *format_namespace(struct namespace *namespace, const char *prefix, const ch
 
 static inline enum type_type type_get_type_detect_alias(const type_t *type)
 {
-    if (type->is_alias)
-        return TYPE_ALIAS;
     return type->type_type;
 }