Test the deque a bit. Give it a get-by-index method. Fix two uncovered state-calculation bugs --- one decently, the other with an ugly hack. Bug on the latter coming right up.

src/Makefile

@@ -426,6 +426,7 @@ TEST_XFAILS_LLVM := $(addprefix test/run-pass/, \
                       lazy-and-or.rs \
                       lazy-init.rs \
                       lazychan.rs \
+                      lib-deque.rs \
                       lib-rand.rs \
                       linear-for-loop.rs \
                       list.rs \

src/boot/me/semant.ml

@@ -1061,6 +1061,23 @@ let rec simplified_ty (t:Ast.ty) : Ast.ty =
     | t -> t
 ;;
 
+let rec innermost_box_ty (t:Ast.ty) : Ast.ty =
+  match strip_mutable_or_constrained_ty t with
+      Ast.TY_box t -> innermost_box_ty t
+    | _ -> t
+;;
+
+let simplified_ty_innermost_was_mutable (t:Ast.ty) : Ast.ty * bool =
+  let rec simplify_innermost t =
+    match t with
+        Ast.TY_mutable t -> (fst (simplify_innermost t), true)
+      | Ast.TY_constrained (t, _) -> simplify_innermost t
+      | _ -> (t, false)
+  in
+  let t = innermost_box_ty t in
+    simplify_innermost t
+;;
+
 let rec project_type
     (base_ty:Ast.ty)
     (comp:Ast.lval_component)

src/boot/me/trans.ml

@@ -1103,6 +1103,7 @@ let trans_visitor
       (t:Ast.ty)
       (sz:int64)
       (align:int64)
+      (force_stateful:bool)
       : Il.operand =
     trans_crate_rel_data_operand
       (DATA_tydesc t)
@@ -1112,7 +1113,9 @@ let trans_visitor
           let fix fixup =
             fixup_rel_word tydesc_fixup fixup
           in
-          let is_stateful = if type_has_state t then 1L else 0L in
+          let is_stateful =
+            if (force_stateful || type_has_state t) then 1L else 0L
+          in
           log cx "tydesc for %a has sz=%Ld, align=%Ld, is_stateful=%Ld"
             Ast.sprintf_ty t sz align is_stateful;
             Asm.DEF
@@ -2343,11 +2346,15 @@ let trans_visitor
         dst_cell dst_ty src_cell src_ty None
 
 
-  and get_dynamic_tydesc (idopt:node_id option) (t:Ast.ty) : Il.cell =
+  and get_dynamic_tydesc
+      (idopt:node_id option)
+      (t:Ast.ty)
+      (force_stateful:bool)
+      : Il.cell =
     let td = next_vreg_cell Il.voidptr_t in
     let root_desc =
       Il.Cell (crate_rel_to_ptr
-                 (get_static_tydesc idopt t 0L 0L)
+                 (get_static_tydesc idopt t 0L 0L force_stateful)
                  (tydesc_rty abi))
     in
     let (t, param_descs) = linearize_ty_params t in
@@ -2378,15 +2385,17 @@ let trans_visitor
 
   and get_tydesc (idopt:node_id option) (ty:Ast.ty) : Il.cell =
     log cx "getting tydesc for %a" Ast.sprintf_ty ty;
-    match simplified_ty ty with
+    let (ty, mut) = simplified_ty_innermost_was_mutable ty in
+    match ty with
         Ast.TY_param (idx, _) ->
           (get_ty_param_in_current_frame idx)
       | t when has_parametric_types t ->
-          (get_dynamic_tydesc idopt t)
+          (get_dynamic_tydesc idopt t mut)
       | _ ->
           (crate_rel_to_ptr (get_static_tydesc idopt ty
                                (ty_sz abi ty)
-                               (ty_align abi ty))
+                               (ty_align abi ty)
+                               mut)
              (tydesc_rty abi))
 
   and box_rc_cell (cell:Il.cell) : Il.cell =

src/lib/deque.rs

@@ -17,6 +17,8 @@ type t[T] = obj {
 
   fn peek_front() -> T;
   fn peek_back() -> T;
+
+  fn get(int i) -> T;
 };
 
 fn create[T]() -> t[T] {
@@ -128,6 +130,11 @@ fn create[T]() -> t[T] {
     fn peek_back() -> T {
       ret get[T](elts, hi);
     }
+
+    fn get(int i) -> T {
+      let uint idx = (lo + (i as uint)) % _vec.len[cell[T]](elts);
+      ret get[T](elts, idx);
+    }
   }
 
   let vec[cell[T]] v = _vec.init_elt[cell[T]](util.none[T](),

src/rt/rust_crate_cache.cpp

@@ -216,6 +216,7 @@ rust_crate_cache::get_type_desc(size_t size,
                  "rust_crate_cache::descs[%" PRIdPTR "] = 0x%" PRIxPTR,
                  i, descs[i]);
         td->descs[i] = descs[i];
+        td->is_stateful |= descs[i]->is_stateful;
     }
     adjust_disp(td->copy_glue_off, descs[0], td);
     adjust_disp(td->drop_glue_off, descs[0], td);

src/rt/rust_upcall.cpp

@@ -499,8 +499,13 @@ extern "C" CDECL uintptr_t upcall_require_c_sym(rust_task *task,
 }
 
 extern "C" CDECL type_desc *
-upcall_get_type_desc(rust_task *task, rust_crate const *curr_crate,
+upcall_get_type_desc(rust_task *task,
-    size_t size, size_t align, size_t n_descs, type_desc const **descs) {
+                     rust_crate const *curr_crate,
+                     size_t size,
+                     size_t align,
+                     size_t n_descs,
+                     type_desc const **descs)
+{
     LOG_UPCALL_ENTRY(task);
     task->log(rust_log::UPCALL | rust_log::CACHE,
               "upcall get_type_desc with size=%" PRIdPTR

src/test/run-pass/lib-deque.rs

@@ -0,0 +1,17 @@
+// -*- rust -*-
+
+use std;
+import std.deque;
+
+fn main() {
+  let deque.t[int] d1 = deque.create[int]();
+  check (d1.size() == 0u);
+  d1.add_front(17);
+  d1.add_front(42);
+  d1.add_back(137);
+  check (d1.size() == 3u);
+  d1.add_back(137);
+  check (d1.size() == 4u);
+  /* FIXME (issue #133):  We should check that the numbers come back
+   * to us correctly once the deque stops zeroing them out. */
+}