diff options
Diffstat (limited to '')
| -rw-r--r-- | compiler/Extract.ml | 8 | ||||
| -rw-r--r-- | compiler/PureMicroPasses.ml | 43 |
2 files changed, 48 insertions, 3 deletions
diff --git a/compiler/Extract.ml b/compiler/Extract.ml index 8dd5910f..f2b5f00f 100644 --- a/compiler/Extract.ml +++ b/compiler/Extract.ml @@ -2054,7 +2054,13 @@ and extract_StructUpdate (ctx : extraction_ctx) (fmt : F.formatter) let var_name = ctx_get_var (Option.get supd.init) ctx in F.pp_print_string fmt var_name; F.pp_print_space fmt (); - F.pp_print_string fmt "where"; + let where_keyword = + match !backend with + | FStar -> "where" + | Lean -> "with" + | Coq -> raise (Failure "Unreachable") + in + F.pp_print_string fmt where_keyword; F.pp_print_space fmt ()); F.pp_open_hvbox fmt 0; let delimiter = match !backend with Lean -> "," | Coq | FStar -> ";" in diff --git a/compiler/PureMicroPasses.ml b/compiler/PureMicroPasses.ml index 7d01a622..74f3c576 100644 --- a/compiler/PureMicroPasses.ml +++ b/compiler/PureMicroPasses.ml @@ -1178,8 +1178,47 @@ let simplify_aggregates (ctx : trans_ctx) (def : fun_decl) : fun_decl = List.length filt_var_projs = List.length updates && List.for_all (fun y -> y = x) filt_var_projs then { e with e = Var x } - else (* TODO *) - super#visit_texpression env e + else if + (* Attempt to create an "update" expression (i.e., of + the shape [{ x with f := v }]). + + This is not supported by Coq *) + !Config.backend <> Coq + then ( + (* Compute the number of occurrences of each variable *) + let occurs = ref VarId.Map.empty in + List.iter + (fun x -> + let num = + match VarId.Map.find_opt x !occurs with + | None -> 1 + | Some n -> n + 1 + in + occurs := VarId.Map.add x num !occurs) + filt_var_projs; + (* Find the max - note that we can initialize the max at 0, + because there is at least one variable *) + let max = ref 0 in + let x = ref x in + List.iter + (fun (y, n) -> + if n > !max then ( + max := n; + x := y)) + (VarId.Map.bindings !occurs); + (* Create the update expression *) + let updates = + List.filter_map + (fun ((fid, fe), y_opt) -> + if y_opt = Some !x then None else Some (fid, fe)) + (List.combine updates var_projs) + in + let supd = + StructUpdate { struct_id; init = Some !x; updates } + in + let e = { e with e = supd } in + super#visit_texpression env e) + else super#visit_texpression env e | _ -> super#visit_texpression env e end in |