rustc: Implement conversions from interior vector data to unsafe pointers and vice-versa

src/lib/ivec.rs

@@ -12,6 +12,8 @@ native "rust-intrinsic" mod rusti {
 native "rust" mod rustrt {
     fn ivec_reserve[T](&mutable T[] v, uint n);
     fn ivec_on_heap[T](&T[] v) -> bool;
+    fn ivec_to_ptr[T](&T[] v) -> *T;
+    fn ivec_copy_from_buf[T](&mutable T[] v, *T ptr, uint count);
 }
 
 /// Reserves space for `n` elements in the given vector.
@@ -23,3 +25,17 @@ fn on_heap[T](&T[] v) -> bool {
     ret rustrt::ivec_on_heap(v);
 }
 
+fn to_ptr[T](&T[] v) -> *T {
+    ret rustrt::ivec_to_ptr(v);
+}
+
+fn len[T](&T[] v) -> uint {
+    ret rusti::ivec_len(v);
+}
+
+mod unsafe {
+    fn copy_from_buf[T](&mutable T[] v, *T ptr, uint count) {
+        ret rustrt::ivec_copy_from_buf(v, ptr, count);
+    }
+}
+