You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
60 lines
1.6 KiB
60 lines
1.6 KiB
(*
|
|
* Copyright (c) 2016 - present Facebook, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This source code is licensed under the BSD style license found in the
|
|
* LICENSE file in the root directory of this source tree. An additional grant
|
|
* of patent rights can be found in the PATENTS file in the same directory.
|
|
*)
|
|
|
|
open! IStd
|
|
module IdMap = Var.Map
|
|
module L = Logging
|
|
|
|
type astate = AccessPath.t IdMap.t
|
|
|
|
include IdMap
|
|
|
|
let pp fmt astate = IdMap.pp ~pp_value:AccessPath.pp fmt astate
|
|
|
|
let check_invariant ap1 ap2 = function
|
|
| Var.ProgramVar pvar when Pvar.is_ssa_frontend_tmp pvar ->
|
|
(* Sawja reuses temporary variables which sometimes breaks this invariant *)
|
|
()
|
|
| id ->
|
|
if not (AccessPath.equal ap1 ap2) then
|
|
L.(die InternalError)
|
|
"Id %a maps to both %a and %a" Var.pp id AccessPath.pp ap1 AccessPath.pp ap2
|
|
|
|
|
|
let ( <= ) ~lhs ~rhs =
|
|
if phys_equal lhs rhs then true
|
|
else
|
|
IdMap.for_all
|
|
(fun id lhs_ap ->
|
|
let rhs_has = IdMap.mem id rhs in
|
|
if rhs_has && Config.debug_exceptions then check_invariant lhs_ap (IdMap.find id rhs) id ;
|
|
rhs_has )
|
|
lhs
|
|
|
|
|
|
let join astate1 astate2 =
|
|
if phys_equal astate1 astate2 then astate1
|
|
else
|
|
IdMap.merge
|
|
(fun var ap1_opt ap2_opt ->
|
|
match (ap1_opt, ap2_opt) with
|
|
| Some ap1, Some ap2 ->
|
|
if Config.debug_exceptions then check_invariant ap1 ap2 var ;
|
|
ap1_opt
|
|
| Some _, None ->
|
|
ap1_opt
|
|
| None, Some _ ->
|
|
ap2_opt
|
|
| None, None ->
|
|
None )
|
|
astate1 astate2
|
|
|
|
|
|
let widen ~prev ~next ~num_iters:_ = join prev next
|