Generalized SynchronisationScope for BuilderMethods

Author: denismerigoux

src/librustc_codegen_llvm/builder.rs

@@ -1097,12 +1097,12 @@ impl BuilderMethods<'a, 'll, 'tcx, Value, BasicBlock>
         }
     }
 
-    fn atomic_fence(&self, order: traits::AtomicOrdering, scope: SynchronizationScope) {
+    fn atomic_fence(&self, order: traits::AtomicOrdering, scope: traits::SynchronizationScope) {
         unsafe {
             llvm::LLVMRustBuildAtomicFence(
                 self.llbuilder,
                 AtomicOrdering::from_generic(order),
-                scope
+                SynchronizationScope::from_generic(scope)
             );
         }
     }

src/librustc_codegen_llvm/intrinsic.rs

@@ -31,7 +31,7 @@ use syntax::symbol::Symbol;
 use builder::Builder;
 use value::Value;
 
-use traits::{BuilderMethods, AtomicRmwBinOp};
+use traits::{BuilderMethods, AtomicRmwBinOp, SynchronizationScope};
 
 use rustc::session::Session;
 use syntax_pos::Span;
@@ -521,12 +521,12 @@ pub fn codegen_intrinsic_call(
                 }
 
                 "fence" => {
-                    bx.atomic_fence(order, llvm::SynchronizationScope::CrossThread);
+                    bx.atomic_fence(order, SynchronizationScope::CrossThread);
                     return;
                 }
 
                 "singlethreadfence" => {
-                    bx.atomic_fence(order, llvm::SynchronizationScope::SingleThread);
+                    bx.atomic_fence(order, SynchronizationScope::SingleThread);
                     return;
                 }
 

src/librustc_codegen_llvm/llvm/ffi.rs

@@ -304,6 +304,16 @@ pub enum SynchronizationScope {
     CrossThread,
 }
 
+impl SynchronizationScope {
+    pub fn from_generic(sc : traits::SynchronizationScope) -> Self {
+        match sc {
+            traits::SynchronizationScope::Other => SynchronizationScope::Other,
+            traits::SynchronizationScope::SingleThread => SynchronizationScope::SingleThread,
+            traits::SynchronizationScope::CrossThread => SynchronizationScope::CrossThread,
+        }
+    }
+}
+
 /// LLVMRustFileType
 #[derive(Copy, Clone)]
 #[repr(C)]

src/librustc_codegen_llvm/traits.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use llvm::{SynchronizationScope, AsmDialect};
+use llvm::AsmDialect;
 use common::*;
 use type_::Type;
 use libc::c_char;
@@ -94,6 +94,14 @@ pub enum AtomicOrdering {
     SequentiallyConsistent,
 }
 
+pub enum SynchronizationScope {
+    // FIXME: figure out if this variant is needed at all.
+    #[allow(dead_code)]
+    Other,
+    SingleThread,
+    CrossThread,
+}
+
 
 pub trait BuilderMethods<'a, 'll :'a, 'tcx: 'll,
     Value : ?Sized,