[pulsebo] more binary operators

Summary: more useful

Reviewed By: skcho

Differential Revision: D18811181

fbshipit-source-id: b324f2804

infer/src/bufferoverrun/itv.ml

@@ -201,11 +201,22 @@ module ItvPure = struct
     (l', u')
 
 
-  let to_bool : t -> Boolean.t =
+  let to_boolean : t -> Boolean.t =
    fun x -> if is_false x then Boolean.False else if is_true x then Boolean.True else Boolean.Top
 
 
-  let lnot : t -> Boolean.t = fun x -> to_bool x |> Boolean.not_
+  let of_boolean : Boolean.t -> t bottom_lifted = function
+    | True ->
+        NonBottom (of_int 1)
+    | False ->
+        NonBottom (of_int 0)
+    | Bottom ->
+        Bottom
+    | Top ->
+        NonBottom top
+
+
+  let lnot : t -> Boolean.t = fun x -> to_boolean x |> Boolean.not_
 
   let plus : t -> t -> t =
    fun (l1, u1) (l2, u2) -> (Bound.plus_l ~weak:false l1 l2, Bound.plus_u ~weak:false u1 u2)
@@ -368,9 +379,9 @@ module ItvPure = struct
     else Boolean.Top
 
 
-  let land_sem : t -> t -> Boolean.t = fun x y -> Boolean.and_ (to_bool x) (to_bool y)
+  let land_sem : t -> t -> Boolean.t = fun x y -> Boolean.and_ (to_boolean x) (to_boolean y)
 
-  let lor_sem : t -> t -> Boolean.t = fun x y -> Boolean.or_ (to_bool x) (to_bool y)
+  let lor_sem : t -> t -> Boolean.t = fun x y -> Boolean.or_ (to_boolean x) (to_boolean y)
 
   let lift_minmax_bound ~use_minmax_bound ~mk ~f x y =
     let r = f x y in
@@ -404,8 +415,48 @@ module ItvPure = struct
         Bottom
 
 
+  let assert_no_bottom = function Bottom -> assert false | NonBottom x -> x
+
   let arith_binop (bop : Binop.t) x y =
-    match bop with PlusA _ -> Some (plus x y) | MinusA _ -> Some (minus x y) | _ -> None
+    match bop with
+    | Binop.PlusA _ ->
+        plus x y
+    | Binop.MinusA _ ->
+        minus x y
+    | Binop.Mult _ ->
+        mult x y
+    | Binop.PlusPI | Binop.MinusPI | Binop.MinusPP ->
+        top
+    | Binop.Div ->
+        div x y
+    | Binop.Mod ->
+        mod_sem x y
+    | Binop.Shiftlt ->
+        shiftlt x y
+    | Binop.Shiftrt ->
+        shiftrt x y
+    | Binop.Lt ->
+        of_boolean (lt_sem x y) |> assert_no_bottom
+    | Binop.Gt ->
+        of_boolean (gt_sem x y) |> assert_no_bottom
+    | Binop.Le ->
+        of_boolean (le_sem x y) |> assert_no_bottom
+    | Binop.Ge ->
+        of_boolean (ge_sem x y) |> assert_no_bottom
+    | Binop.Eq ->
+        of_boolean (eq_sem x y) |> assert_no_bottom
+    | Binop.Ne ->
+        of_boolean (ne_sem x y) |> assert_no_bottom
+    | Binop.BAnd ->
+        band_sem x y
+    | Binop.BXor ->
+        top
+    | Binop.BOr ->
+        top
+    | Binop.LAnd ->
+        of_boolean (land_sem x y) |> assert_no_bottom
+    | Binop.LOr ->
+        of_boolean (lor_sem x y) |> assert_no_bottom
 
 
   let arith_unop (unop : Unop.t) x = match unop with Neg -> Some (neg x) | BNot | LNot -> None
@@ -634,15 +685,6 @@ let lift2 : (ItvPure.t -> ItvPure.t -> ItvPure.t) -> t -> t -> t =
       NonBottom (f x y)
 
 
-let lift2opt : (ItvPure.t -> ItvPure.t -> ItvPure.t option) -> t -> t -> t option =
- fun f x y ->
-  match (x, y) with
-  | Bottom, _ | _, Bottom ->
-      Some Bottom
-  | NonBottom x, NonBottom y ->
-      f x y |> Option.map ~f:(fun v -> NonBottom v)
-
-
 let bind2_gen : bot:'a -> (ItvPure.t -> ItvPure.t -> 'a) -> t -> t -> 'a =
  fun ~bot f x y ->
   match (x, y) with Bottom, _ | _, Bottom -> bot | NonBottom x, NonBottom y -> f x y
@@ -720,7 +762,7 @@ let max_sem : ?use_minmax_bound:bool -> t -> t -> t =
  fun ?use_minmax_bound -> lift2 (ItvPure.max_sem ?use_minmax_bound)
 
 
-let arith_binop : Binop.t -> t -> t -> t option = fun bop -> lift2opt (ItvPure.arith_binop bop)
+let arith_binop : Binop.t -> t -> t -> t = fun bop -> lift2 (ItvPure.arith_binop bop)
 
 let arith_unop : Unop.t -> t -> t option = fun unop -> lift1opt (ItvPure.arith_unop unop)
 

infer/src/bufferoverrun/itv.mli

@@ -107,7 +107,7 @@ module ItvPure : sig
 
   val get_bound : t -> Symb.BoundEnd.t -> Bound.t
 
-  val arith_binop : Binop.t -> t -> t -> t option
+  val arith_binop : Binop.t -> t -> t -> t
 
   val arith_unop : Unop.t -> t -> t option
 end
@@ -233,7 +233,7 @@ val mod_sem : t -> t -> t
 
 val ne_sem : t -> t -> Boolean.t
 
-val arith_binop : Binop.t -> t -> t -> t option
+val arith_binop : Binop.t -> t -> t -> t
 
 val arith_unop : Unop.t -> t -> t option
 

infer/src/pulse/PulseOperations.ml

@@ -126,11 +126,10 @@ let eval_bo_itv_binop binop_addr bop op_lhs op_rhs astate =
     | AbstractValueOperand v ->
         Memory.get_bo_itv v astate
   in
-  match Itv.ItvPure.arith_binop bop (bo_itv_of_op op_lhs astate) (bo_itv_of_op op_rhs astate) with
-  | None ->
-      astate
-  | Some itv ->
-      Memory.add_attribute binop_addr (BoItv itv) astate
+  let bo_itv =
+    Itv.ItvPure.arith_binop bop (bo_itv_of_op op_lhs astate) (bo_itv_of_op op_rhs astate)
+  in
+  Memory.add_attribute binop_addr (BoItv bo_itv) astate
 
 
 let eval_binop location binop op_lhs op_rhs binop_hist astate =