Support Generic arguments to Structs

This removes StructFieldType from the TyTy base as it is not a type that
can be unified against.

It adds in a substition mapper implementation which will likely change
over time when this this support is extended over to Functions and
TupleStructs.

Note generic argument binding is not supported as part of this yet.

Fixes #235

1 files changed, 3 insertions, 20 deletions

diff --git a/gcc/rust/rust-gcc.cc b/gcc/rust/rust-gcc.cc
index 4df813b..7cb24d8 100644
--- a/gcc/rust/rust-gcc.cc
+++ b/gcc/rust/rust-gcc.cc
@@ -1200,27 +1200,10 @@ Gcc_backend::named_type (const std::string &name, Btype *btype,
   if (type == error_mark_node)
     return this->error_type ();
 
-  // The middle-end expects a basic type to have a name.  In Go every
-  // basic type will have a name.  The first time we see a basic type,
-  // give it whatever Go name we have at this point.
-  if (TYPE_NAME (type) == NULL_TREE
-      && location.gcc_location () == BUILTINS_LOCATION
-      && (TREE_CODE (type) == INTEGER_TYPE || TREE_CODE (type) == REAL_TYPE
-	  || TREE_CODE (type) == COMPLEX_TYPE
-	  || TREE_CODE (type) == BOOLEAN_TYPE))
-    {
-      tree decl = build_decl (BUILTINS_LOCATION, TYPE_DECL,
-			      get_identifier_from_string (name), type);
-      TYPE_NAME (type) = decl;
-      return this->make_type (type);
-    }
-
-  tree copy = build_variant_type_copy (type);
   tree decl = build_decl (location.gcc_location (), TYPE_DECL,
-			  get_identifier_from_string (name), copy);
-  DECL_ORIGINAL_TYPE (decl) = type;
-  TYPE_NAME (copy) = decl;
-  return this->make_type (copy);
+			  get_identifier_from_string (name), type);
+  TYPE_NAME (type) = decl;
+  return this->make_type (type);
 }
 
 // Return a pointer type used as a marker for a circular type.