auto merge of #1772 : pcwalton/servo/borrow-flags-race, r=jdm

r? @jdm

1 files changed, 11 insertions, 0 deletions

diff --git a/src/components/script/dom/bindings/js.rs b/src/components/script/dom/bindings/js.rs
index aa7ba954a48..4aaf3506ae8 100644
--- a/src/components/script/dom/bindings/js.rs
+++ b/src/components/script/dom/bindings/js.rs
@@ -89,6 +89,13 @@ impl<T> JS<T> {
             &mut (**borrowed.get())
         }
     }
+
+    /// Returns an unsafe pointer to the interior of this JS object without touching the borrow
+    /// flags. This is the only method that be safely accessed from layout. (The fact that this
+    /// is unsafe is what necessitates the layout wrappers.)
+    pub unsafe fn unsafe_get(&self) -> *mut T {
+        cast::transmute_copy(&self.ptr)
+    }
 }
 
 impl<From, To> JS<From> {
@@ -96,4 +103,8 @@ impl<From, To> JS<From> {
     pub unsafe fn transmute(self) -> JS<To> {
         cast::transmute(self)
     }
+
+    pub unsafe fn transmute_copy(&self) -> JS<To> {
+        cast::transmute_copy(self)
+    }
 }