temporarily remove branch ins

bin/main.ml

@@ -8,17 +8,31 @@ let[@warning "-26"] () =
     let int n = Code.Cst_int (Int64.of_int n) in
     let reg n = Code.Reg n in
 
-    let posn_vt = Value.make_vtable [ "x"; "y" ] in
+    let vtable = Value.make_vtable [ "x"; "y" ] in
     let ep =
       Code.make_basic_block
         [
-          CON (0, posn_vt);
-          (* MOV (1, int 0); "x" *)
-          (* MOV (2, int 100); *)
-          (* SET (0, 1); *)
-          (* MOV (1, int 1); "y" *)
-          (* MOV (2, int 100); *)
-          (* SET (0, 1); *)
+          (* obj o {...} *)
+          CON (0, vtable);
+          (* o.x = 999 *)
+          MOV (2, int 999);
+          MOV (1, int 0);
+          SET (0, 1);
+          (* o.y = 11 *)
+          MOV (2, int 11);
+          MOV (1, int 1);
+          SET (0, 1);
+          (* _1 = o.x *)
+          MOV (1, int 0);
+          GET (0, 1);
+          (* _2 = o.y *)
+          MOV (2, int 1);
+          GET (0, 2);
+          (* _3 = _1 * _2 *)
+          MUL (2, reg 1);
+          (* o.x = _3 *)
+          MOV (1, int 0);
+          SET (0, 1);
         ]
     in
 

lib/runtime/code.ml

@@ -20,8 +20,9 @@ and ins =
   | SUB of regidx * operand
   | MUL of regidx * operand
   | CON of regidx * Value.vtable
+  | GET of regidx * regidx
+  | SET of regidx * regidx
   | JMP of basic_block
-  | BRT of operand * basic_block * basic_block
   | RET
 
 let make_basic_block ins_list = { ins_builder = List.rev ins_list; ins_list }
@@ -53,10 +54,12 @@ let frame_size prog =
   let ins acc = function
     | MOV (r, v) | ADD (r, v) | SUB (r, v) | MUL (r, v) -> op (reg acc r) v
     | CON (r, _) -> reg acc r
-    | BRT (v, b1, b2) ->
-        enqueue b1;
-        enqueue b2;
-        op acc v
+    | GET (o, v) -> reg (reg acc o) v
+    | SET (o, v) -> reg (reg acc o) (v + 1)
+    (* | BRT (v, b1, b2) -> *)
+    (*     enqueue b1; *)
+    (*     enqueue b2; *)
+    (*     op acc v *)
     | JMP b ->
         enqueue b;
         acc
@@ -83,16 +86,28 @@ let pp_operand ppf = function
   | Cst_int n -> Fmt.pf ppf "#%s" (Int64.to_string n)
   | Reg r -> pp_reg ppf r
 
+let pp_vtable ppf vt =
+  Fmt.pf ppf "(%d){" vt.Value.n_slots;
+  let sep = ref "" in
+  Hashtbl.iter
+    (fun name -> function
+      | Value.Method -> ()
+      | Value.Field idx ->
+          Fmt.pf ppf "%s%s@%d" !sep name idx;
+          sep := ";")
+    vt.elems;
+  Fmt.pf ppf "}"
+
 let pp_ins ~get_bb_name ppf = function
   | MOV (l, r) -> Fmt.pf ppf "mov %a, %a" pp_reg l pp_operand r
   | ADD (l, r) -> Fmt.pf ppf "add %a, %a" pp_reg l pp_operand r
   | SUB (l, r) -> Fmt.pf ppf "sub %a, %a" pp_reg l pp_operand r
   | MUL (l, r) -> Fmt.pf ppf "mul %a, %a" pp_reg l pp_operand r
-  | CON (l, vt) -> Fmt.pf ppf "con %a, %a" pp_reg l Value.pp_vtable vt
+  | CON (l, vt) -> Fmt.pf ppf "con %a, %a" pp_reg l pp_vtable vt
+  | GET (o, s) -> Fmt.pf ppf "mov %a, %a[%a]" pp_reg s pp_reg o pp_reg s
+  | SET (o, s) -> Fmt.pf ppf "mov %a[%a], %a" pp_reg o pp_reg s pp_reg (s + 1)
   | RET -> Fmt.pf ppf "ret"
   | JMP l -> Fmt.pf ppf "jmp %s" (get_bb_name l)
-  | BRT (v, l1, l2) ->
-      Fmt.pf ppf "brt %a, %s, %s" pp_operand v (get_bb_name l1) (get_bb_name l2)
 
 let pp_program ppf pr =
   let ep = pr.entrypoint in

lib/runtime/interp.ml

@@ -16,9 +16,15 @@ module Op = struct
     | Value.Int x, Value.Int y -> Value.Int (Int64.mul x y)
     | _, _ -> raise (Runtime_error "cannot mul non integer values")
 
-  let is_true = function
-    | Value.True -> true
-    | _ -> false
+  let get o s =
+    match o, s with
+    | Value.Obj (_, slots), Value.Int i -> slots.(Int64.to_int i)
+    | _ -> raise (Runtime_error "get field of non-object")
+
+  let set o s v =
+    match o, s with
+    | Value.Obj (_, slots), Value.Int i -> slots.(Int64.to_int i) <- v
+    | _ -> raise (Runtime_error "set field of non-object")
 end
 
 type frame = {
@@ -47,11 +53,10 @@ let exec fr = function
   | Code.SUB (l, r) -> fr.regs.(l) <- Op.add fr.regs.(l) (eval fr r)
   | Code.MUL (l, r) -> fr.regs.(l) <- Op.mul fr.regs.(l) (eval fr r)
   | Code.CON (l, vt) -> fr.regs.(l) <- Value.make_obj vt
+  | Code.GET (o, s) -> fr.regs.(s) <- Op.get fr.regs.(o) fr.regs.(s)
+  | Code.SET (o, s) -> Op.set fr.regs.(o) fr.regs.(s) fr.regs.(s + 1)
   | Code.RET -> fr.pc <- []
   | Code.JMP l -> fr.pc <- Code.instructions l
-  | Code.BRT (v, l1, l2) ->
-      if Value.equal (eval fr v) True then fr.pc <- Code.instructions l1
-      else fr.pc <- Code.instructions l2
 
 let rec run fr =
   match fr.pc with

lib/runtime/value.ml

@@ -15,18 +15,6 @@ let make_vtable fields =
     elems = List.to_seq fields |> Seq.mapi (fun i name -> name, Field i) |> Hashtbl.of_seq;
   }
 
-let pp_vtable ppf vt =
-  Fmt.pf ppf "<%d>{" vt.n_slots;
-  let sep = ref "" in
-  Hashtbl.iter
-    (fun name -> function
-      | Method -> ()
-      | Field idx ->
-          Fmt.pf ppf "%s%s@%d" !sep name idx;
-          sep := ";")
-    vt.elems;
-  Fmt.pf ppf "}"
-
 type t =
   | Nil
   | True