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[pulse][formula] improve printing

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Summary:
Do not always add parens around sub-terms, and add more parens around
terms in atoms and normal forms when they can be confused with the atom
or normal form structure.

Reviewed By: skcho

Differential Revision: D22925549

fbshipit-source-id: 8646e96a5
master
Jules Villard 4 years ago committed by Facebook GitHub Bot
parent 934a13a134
commit 6f5b125aa0
2 changed files with 103 additions and 45 deletions
Show Stats Download Patch File Download Diff File

107
infer/src/pulse/PulseFormula.ml
Unescape View File

@ -36,48 +36,86 @@ module Term = struct
let equal_syntax = [%compare.equal: t]
let rec pp fmt = function
let needs_paren = function
| Const (Cint i) when IntLit.isnegative i ->
true
| Const (Cfloat _) ->
true
| Const (Cint _ | Cfun _ | Cstr _ | Cclass _) ->
false
| Var _ ->
false
| Minus _
| BitNot _
| Not _
| Add _
| Mult _
| Div _
| Mod _
| BitAnd _
| BitOr _
| BitShiftLeft _
| BitShiftRight _
| BitXor _
| And _
| Or _
| LessThan _
| LessEqual _
| Equal _
| NotEqual _ ->
true
let rec pp_paren ~needs_paren fmt t =
if needs_paren t then F.fprintf fmt "(%a)" pp_no_paren t else pp_no_paren fmt t
and pp_no_paren fmt = function
| Var v ->
AbstractValue.pp fmt v
| Const c ->
Const.pp Pp.text fmt c
| Minus t ->
F.fprintf fmt "-(%a)" pp t
F.fprintf fmt "-%a" (pp_paren ~needs_paren) t
| BitNot t ->
F.fprintf fmt "BitNot(%a)" pp t
F.fprintf fmt "BitNot%a" (pp_paren ~needs_paren) t
| Not t ->
F.fprintf fmt "¬(%a)" pp t
F.fprintf fmt "¬%a" (pp_paren ~needs_paren) t
| Add (t1, Minus t2) ->
F.fprintf fmt "%a-%a" (pp_paren ~needs_paren) t1 (pp_paren ~needs_paren) t2
| Add (t1, t2) ->
F.fprintf fmt "(%a)+(%a)" pp t1 pp t2
F.fprintf fmt "%a+%a" (pp_paren ~needs_paren) t1 (pp_paren ~needs_paren) t2
| Mult (t1, t2) ->
F.fprintf fmt "(%a)×(%a)" pp t1 pp t2
F.fprintf fmt "%a×%a" (pp_paren ~needs_paren) t1 (pp_paren ~needs_paren) t2
| Div (t1, t2) ->
F.fprintf fmt "(%a)÷(%a)" pp t1 pp t2
F.fprintf fmt "%a÷%a" (pp_paren ~needs_paren) t1 (pp_paren ~needs_paren) t2
| Mod (t1, t2) ->
F.fprintf fmt "(%a) mod (%a)" pp t1 pp t2
F.fprintf fmt "%a mod %a" (pp_paren ~needs_paren) t1 (pp_paren ~needs_paren) t2
| BitAnd (t1, t2) ->
F.fprintf fmt "(%a)&(%a)" pp t1 pp t2
F.fprintf fmt "%a&%a" (pp_paren ~needs_paren) t1 (pp_paren ~needs_paren) t2
| BitOr (t1, t2) ->
F.fprintf fmt "(%a)|(%a)" pp t1 pp t2
F.fprintf fmt "%a|%a" (pp_paren ~needs_paren) t1 (pp_paren ~needs_paren) t2
| BitShiftLeft (t1, t2) ->
F.fprintf fmt "(%a)<<(%a)" pp t1 pp t2
F.fprintf fmt "%a<<%a" (pp_paren ~needs_paren) t1 (pp_paren ~needs_paren) t2
| BitShiftRight (t1, t2) ->
F.fprintf fmt "(%a)>>(%a)" pp t1 pp t2
F.fprintf fmt "%a>>%a" (pp_paren ~needs_paren) t1 (pp_paren ~needs_paren) t2
| BitXor (t1, t2) ->
F.fprintf fmt "(%a) xor (%a)" pp t1 pp t2
F.fprintf fmt "%a xor %a" (pp_paren ~needs_paren) t1 (pp_paren ~needs_paren) t2
| And (t1, t2) ->
F.fprintf fmt "(%a)∧(%a)" pp t1 pp t2
F.fprintf fmt "%a∧%a" (pp_paren ~needs_paren) t1 (pp_paren ~needs_paren) t2
| Or (t1, t2) ->
F.fprintf fmt "(%a)∨(%a)" pp t1 pp t2
F.fprintf fmt "%a∨%a" (pp_paren ~needs_paren) t1 (pp_paren ~needs_paren) t2
| LessThan (t1, t2) ->
F.fprintf fmt "(%a)<(%a)" pp t1 pp t2
F.fprintf fmt "%a<%a" (pp_paren ~needs_paren) t1 (pp_paren ~needs_paren) t2
| LessEqual (t1, t2) ->
F.fprintf fmt "(%a)≤(%a)" pp t1 pp t2
F.fprintf fmt "%a≤%a" (pp_paren ~needs_paren) t1 (pp_paren ~needs_paren) t2
| Equal (t1, t2) ->
F.fprintf fmt "(%a)=(%a)" pp t1 pp t2
F.fprintf fmt "%a=%a" (pp_paren ~needs_paren) t1 (pp_paren ~needs_paren) t2
| NotEqual (t1, t2) ->
F.fprintf fmt "(%a)≠(%a)" pp t1 pp t2
F.fprintf fmt "%a≠%a" (pp_paren ~needs_paren) t1 (pp_paren ~needs_paren) t2
let pp fmt t = pp_no_paren fmt t
let of_absval v = Var v
@ -254,15 +292,20 @@ module Atom = struct
type atom = t
let pp fmt = function
let pp fmt atom =
(* add parens around terms that look like atoms to disambiguate *)
let needs_paren (t : Term.t) =
match t with LessThan _ | LessEqual _ | Equal _ | NotEqual _ -> true | _ -> false
in
match atom with
| LessEqual (t1, t2) ->
F.fprintf fmt "%a ≤ %a" Term.pp t1 Term.pp t2
F.fprintf fmt "%a ≤ %a" (Term.pp_paren ~needs_paren) t1 (Term.pp_paren ~needs_paren) t2
| LessThan (t1, t2) ->
F.fprintf fmt "%a < %a" Term.pp t1 Term.pp t2
F.fprintf fmt "%a < %a" (Term.pp_paren ~needs_paren) t1 (Term.pp_paren ~needs_paren) t2
| Equal (t1, t2) ->
F.fprintf fmt "%a = %a" Term.pp t1 Term.pp t2
F.fprintf fmt "%a = %a" (Term.pp_paren ~needs_paren) t1 (Term.pp_paren ~needs_paren) t2
| NotEqual (t1, t2) ->
F.fprintf fmt "%a ≠ %a" Term.pp t1 Term.pp t2
F.fprintf fmt "%a ≠ %a" (Term.pp_paren ~needs_paren) t1 (Term.pp_paren ~needs_paren) t2
let nnot = function
@ -521,25 +564,31 @@ let rec pp fmt = function
in
F.fprintf fmt "@[<hv>%t@]" (fun _fmt -> fold coll ~init:true ~f:pp_coll_aux |> ignore)
in
let term_pp_paren = Term.pp_paren ~needs_paren:Term.needs_paren in
let pp_ts_or_repr repr fmt ts =
if UnionFind.Set.is_empty ts then Term.pp fmt repr
if UnionFind.Set.is_empty ts then term_pp_paren fmt repr
else
pp_collection ~sep:"="
~fold:(IContainer.fold_of_pervasives_set_fold UnionFind.Set.fold)
~pp_item:Term.pp fmt ts
~pp_item:term_pp_paren fmt ts
in
let pp_congruences fmt congruences =
pp_collection ~sep:"∧" ~fold:UnionFind.fold_congruences fmt congruences
let is_empty = ref true in
pp_collection ~sep:" ∧ " ~fold:UnionFind.fold_congruences fmt congruences
~pp_item:(fun fmt ((repr : UnionFind.repr), ts) ->
F.fprintf fmt "%a=%a" Term.pp (repr :> Term.t) (pp_ts_or_repr (repr :> Term.t)) ts )
is_empty := false ;
F.fprintf fmt "%a=%a" term_pp_paren (repr :> Term.t) (pp_ts_or_repr (repr :> Term.t)) ts ) ;
if !is_empty then pp fmt True
in
let pp_atoms fmt atoms =
if Atom.Set.is_empty atoms then pp fmt True
else
pp_collection ~sep:"∧"
~fold:(IContainer.fold_of_pervasives_set_fold Atom.Set.fold)
~pp_item:(fun fmt atom -> F.fprintf fmt "{%a}" Atom.pp atom)
fmt atoms
in
F.fprintf fmt "[%a@;&&@ %a]" pp_congruences congruences pp_atoms facts
F.fprintf fmt "[@[<hv>%a@ &&@ %a@]]" pp_congruences congruences pp_atoms facts
| And (phi1, phi2) ->
F.fprintf fmt "{%a}∧{%a}" pp phi1 pp phi2

33
infer/src/pulse/unit/PulseFormulaTest.ml
Unescape View File

@ -51,14 +51,12 @@ let%test_module _ =
let%expect_test _ =
normalize (x + i 1 - i 1 < x) ;
[%expect {|
[ &&
{((v1)+(1))+(-1) < v1}]|}]
[true && {(v1+1)+(-1) < v1}]|}]
let%expect_test _ =
normalize (x + (y - x) < y) ;
[%expect {|
[ &&
{(v1)+((v2)+(-(v1))) < v2}]|}]
[true && {v1+(v2-v1) < v2}]|}]
let%expect_test _ =
normalize (x = y && y = z && z = i 0 && x = i 1) ;
@ -69,25 +67,36 @@ let%test_module _ =
let%expect_test _ =
normalize (x = w + y + i 1 && y + i 1 = z && x = i 1 && w + z = i 0) ;
[%expect {|
[0=(v4)+(v3)∧1=v1=((v4)+(v2))+(1)∧v3=(v2)+(1) &&
]|}]
[0=(v4+v3) ∧ 1=v1=((v4+v2)+1) ∧ v3=(v2+1) && true]|}]
let%expect_test _ =
normalize (x = i 0 && Formula.Term.of_binop Ne x y = i 0 && y = i 1) ;
[%expect {|
[0=v1=(0≠v2) ∧ 1=v2 && true]|}]
let%expect_test _ =
normalize (x = i 0 && Formula.Term.of_binop Eq x y = i 0 && y = i 1) ;
[%expect {|
[0=v1=(0=v2) ∧ 1=v2 && true]|}]
let%expect_test _ =
simplify ~keep:[x_var] (x = i 0 && y = i 1 && z = i 2 && w = i 3) ;
[%expect {|
[0=v1∧1=v2∧2=v3∧3=v4 &&
]|}]
[0=v1 ∧ 1=v2 ∧ 2=v3 ∧ 3=v4 && true]|}]
let%expect_test _ =
simplify ~keep:[x_var] (x = y + i 1 && x = i 0) ;
[%expect {|
[0=v1=(v2+1) && true]|}]
let%expect_test _ =
simplify ~keep:[y_var] (x = y + i 1 && x = i 0) ;
[%expect {|
[0=v1=(v2)+(1) &&
]|}]
[0=v1=(v2+1) && true]|}]
(* should keep most of this or realize that [w = z] hence this boils down to [z+1 = 0] *)
let%expect_test _ =
simplify ~keep:[y_var; z_var] (x = y + z && w = x - y && v = w + i 1 && v = i 0) ;
[%expect {|
[0=v5=(v4)+(1)∧v1=(v2)+(v3)∧v4=(v1)+(-(v2)) &&
]|}]
[0=v5=(v4+1) ∧ v1=(v2+v3) ∧ v4=(v1-v2) && true]|}]
end )

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