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[sledge] Strengthen Exp.invariant

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Summary: Arguments of `Eq | Dq | And | Or | Xor` exps are sorted.

Reviewed By: mbouaziz

Differential Revision: D14075514

fbshipit-source-id: 5e331758c
master
Josh Berdine 6 years ago committed by Facebook Github Bot
parent 0177549315
commit 49c9b3aec4
3 changed files with 39 additions and 32 deletions
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37
sledge/src/llair/exp.ml
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@ -116,6 +116,8 @@ module T0 = struct
[@@deriving compare, hash, sexp]
let equal = [%compare.equal: t]
let sorted e f = compare e f <= 0
let sort e f = if sorted e f then (e, f) else (f, e)
end
module T = struct
@ -406,9 +408,12 @@ let invariant ?(partial = false) e =
|Urem | And | Or | Xor | Shl | Lshr | Ashr -> (
match args with
| [x; y] -> (
match (typ_of x, typ_of y) with
| Some typ, Some typ' -> assert (Typ.castable typ typ')
| _ -> assert true )
( match op with
| Eq | Dq | And | Or | Xor -> assert (sorted x y)
| _ -> () ) ;
match (typ_of x, typ_of y) with
| Some typ, Some typ' -> assert (Typ.castable typ typ')
| _ -> assert true )
| _ -> assert_arity 2 )
| Splat | Memory | Concat | Ord | Uno | Select -> assert_arity 2
| Conditional | Update -> assert_arity 3
@ -682,7 +687,7 @@ let rec simp_mul typ axs bys =
| ax0I, Integer {data= i}, by0M, Integer {data= j} ->
mul_mf (mul_mm ax0I by0M) (integer (Z.mul ~bits i j) typ)
| ax0I, axJ, by0M, byN ->
if compare axJ byN < 0 then mul_mf (mul_mm ax0J by0M) byN
if compare axJ byN <= 0 then mul_mf (mul_mm ax0J by0M) byN
else mul_mf (mul_mm ax0I by0N) axJ )
in
let rec mul_pm ax0J by =
@ -783,10 +788,10 @@ let simp_and x y =
when Z.is_false data ->
f
| _ ->
let c = compare x y in
let ord = compare x y in
(* e && e ==> e *)
if c = 0 then x
else if c < 0 then App {op= App {op= And; arg= x}; arg= y}
if ord = 0 then x
else if ord < 0 then App {op= App {op= And; arg= x}; arg= y}
else App {op= App {op= And; arg= y}; arg= x}
let simp_or x y =
@ -805,10 +810,10 @@ let simp_or x y =
when Z.is_false data ->
e
| _ ->
let c = compare x y in
let ord = compare x y in
(* e || e ==> e *)
if c = 0 then x
else if c < 0 then App {op= App {op= Or; arg= x}; arg= y}
if ord = 0 then x
else if ord < 0 then App {op= App {op= Or; arg= x}; arg= y}
else App {op= App {op= Or; arg= y}; arg= x}
let rec simp_not (typ : Typ.t) exp =
@ -888,11 +893,11 @@ and simp_eq x y =
else (* b = true ==> b *)
b
| x, y ->
let c = compare x y in
let ord = compare x y in
(* e = e ==> true *)
if c = 0 then bool true
else if c < 0 then App {op= App {op= Eq; arg= y}; arg= x}
else App {op= App {op= Eq; arg= x}; arg= y}
if ord = 0 then bool true
else if ord < 0 then App {op= App {op= Eq; arg= x}; arg= y}
else App {op= App {op= Eq; arg= y}; arg= x}
and simp_dq x y =
match simp_eq x y with
@ -911,8 +916,8 @@ let simp_xor x y =
when Z.is_true data ->
simp_not Typ.bool b
| _ ->
let c = compare x y in
if c <= 0 then App {op= App {op= Xor; arg= x}; arg= y}
let ord = compare x y in
if ord <= 0 then App {op= App {op= Xor; arg= x}; arg= y}
else App {op= App {op= Xor; arg= y}; arg= x}
let simp_shl x y =

2
sledge/src/llair/exp.mli
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@ -77,6 +77,8 @@ type exp = t
include Comparator.S with type t := t
val equal : t -> t -> bool
val sort : t -> t -> t * t
val sorted : t -> t -> bool
val pp : t pp
val invariant : ?partial:bool -> t -> unit

32
sledge/src/llair/exp_test.ml
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@ -171,7 +171,7 @@ let%test_module _ =
let%expect_test _ =
pp (z = y) ;
[%expect {| (%z_2 = %y_1) |}]
[%expect {| (%y_1 = %z_2) |}]
let%expect_test _ =
pp (z = z) ;
@ -187,19 +187,19 @@ let%test_module _ =
let%expect_test _ =
pp (!3 * y = z = Exp.bool true) ;
[%expect {| (%z_2 = (3 × %y_1)) |}]
[%expect {| ((3 × %y_1) = %z_2) |}]
let%expect_test _ =
pp (Exp.bool true = (!3 * y = z)) ;
[%expect {| (%z_2 = (3 × %y_1)) |}]
[%expect {| ((3 × %y_1) = %z_2) |}]
let%expect_test _ =
pp (!3 * y = z = Exp.bool false) ;
[%expect {| (%z_2 ≠ (3 × %y_1)) |}]
[%expect {| ((3 × %y_1) ≠ %z_2) |}]
let%expect_test _ =
pp (Exp.bool false = (!3 * y = z)) ;
[%expect {| (%z_2 ≠ (3 × %y_1)) |}]
[%expect {| ((3 × %y_1) ≠ %z_2) |}]
let%expect_test _ =
pp (y - (!(-3) * y) + !4) ;
@ -211,15 +211,15 @@ let%test_module _ =
let%expect_test _ =
pp (y = (!(-3) * y) + !4) ;
[%expect {| (4 = (4 × %y_1)) |}]
[%expect {| ((4 × %y_1) = 4) |}]
let%expect_test _ =
pp ((!(-3) * y) + !4 = y) ;
[%expect {| (4 = (4 × %y_1)) |}]
[%expect {| ((4 × %y_1) = 4) |}]
let%expect_test _ =
pp (Exp.sub Typ.bool (Exp.bool true) (z = !4)) ;
[%expect {| ((4 = %z_2) + -1) |}]
[%expect {| ((%z_2 = 4) + -1) |}]
let%expect_test _ =
pp (Exp.add Typ.bool (Exp.bool true) (z = !4) = (z = !4)) ;
@ -227,23 +227,23 @@ let%test_module _ =
let%expect_test _ =
pp ((!13 * z) + !42 = (!3 * y) + (!13 * z)) ;
[%expect {| (42 = (3 × %y_1)) |}]
[%expect {| ((3 × %y_1) = 42) |}]
let%expect_test _ =
pp ((!13 * z) + !(-42) = (!3 * y) + (!13 * z)) ;
[%expect {| (42 = (-3 × %y_1)) |}]
[%expect {| ((-3 × %y_1) = 42) |}]
let%expect_test _ =
pp ((!13 * z) + !42 = (!(-3) * y) + (!13 * z)) ;
[%expect {| (42 = (-3 × %y_1)) |}]
[%expect {| ((-3 × %y_1) = 42) |}]
let%expect_test _ =
pp ((!10 * z) + !42 = (!(-3) * y) + (!13 * z)) ;
[%expect {| (42 = ((-3 × %y_1) + (3 × %z_2))) |}]
[%expect {| (((-3 × %y_1) + (3 × %z_2)) = 42) |}]
let%expect_test _ =
pp ~~((!13 * z) + !(-42) != (!3 * y) + (!13 * z)) ;
[%expect {| (42 = (-3 × %y_1)) |}]
[%expect {| ((-3 × %y_1) = 42) |}]
let%expect_test _ =
pp ~~(y > !2 && z <= !3) ;
@ -259,9 +259,9 @@ let%test_module _ =
pp Exp.(dq (eq null z) (bool false)) ;
[%expect
{|
(null = %z_2)
(%z_2 = null)
(null = %z_2)
(%z_2 = null)
(null = %z_2) |}]
(%z_2 = null) |}]
end )

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