New Backend trait containing associated types

3 files changed, 19 insertions, 4 deletions

diff --git a/src/librustc_codegen_llvm/interfaces/backend.rs b/src/librustc_codegen_llvm/interfaces/backend.rs
new file mode 100644
index 00000000000..b2a6bf2dd8c
--- /dev/null
+++ b/src/librustc_codegen_llvm/interfaces/backend.rs
@@ -0,0 +1,15 @@
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+pub trait Backend {
+    type Value;
+    type BasicBlock;
+    type Type;
+}
diff --git a/src/librustc_codegen_llvm/interfaces/builder.rs b/src/librustc_codegen_llvm/interfaces/builder.rs
index 994ddd65d3d..c43e41724ee 100644
--- a/src/librustc_codegen_llvm/interfaces/builder.rs
+++ b/src/librustc_codegen_llvm/interfaces/builder.rs
@@ -14,6 +14,7 @@ use rustc::ty::TyCtxt;
 use rustc::ty::layout::{Align, Size};
 use rustc::session::Session;
 use builder::MemFlags;
+use super::backend::Backend;
 
 use std::borrow::Cow;
 use std::ops::Range;
@@ -21,10 +22,7 @@ use syntax::ast::AsmDialect;
 
 
 
-pub trait BuilderMethods<'a, 'll :'a, 'tcx: 'll> {
-    type Value;
-    type BasicBlock;
-    type Type;
+pub trait BuilderMethods<'a, 'll :'a, 'tcx: 'll> : Backend {
 
     fn new_block<'b>(
         cx: &'a CodegenCx<'ll, 'tcx, Self::Value>,
diff --git a/src/librustc_codegen_llvm/interfaces/mod.rs b/src/librustc_codegen_llvm/interfaces/mod.rs
index d0cd8e6a696..b9a356874ba 100644
--- a/src/librustc_codegen_llvm/interfaces/mod.rs
+++ b/src/librustc_codegen_llvm/interfaces/mod.rs
@@ -9,5 +9,7 @@
 // except according to those terms.
 
 mod builder;
+mod backend;
 
 pub use self::builder::BuilderMethods;
+pub use self::backend::Backend;