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(*
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* Copyright (c) 2016 - present Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*)
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open! IStd
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module IdMap = Var.Map
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type astate = AccessPath.raw IdMap.t
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include IdMap
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let pp fmt astate =
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IdMap.pp ~pp_value:AccessPath.pp_raw fmt astate
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let (<=) ~lhs ~rhs =
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if phys_equal lhs rhs
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then true
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else
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try
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IdMap.for_all
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(fun id lhs_ap ->
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let rhs_ap = IdMap.find id rhs in
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let eq = AccessPath.equal_raw lhs_ap rhs_ap in
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if not eq && Config.debug_exceptions
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then
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failwithf "Id %a maps to both %a and %a@."
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Var.pp id
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AccessPath.pp_raw lhs_ap
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AccessPath.pp_raw rhs_ap;
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eq)
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lhs
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with Not_found -> false
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(* in principle, could do a join here if the access paths have the same root. but they should
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always be equal if we are using the map correctly *)
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let check_invariant ap1 ap2 = function
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| Var.ProgramVar pvar when Pvar.is_frontend_tmp pvar ->
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(* Sawja reuses temporary variables which sometimes breaks this invariant *)
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(* TODO: fix (13370224) *)
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()
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| id ->
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if not (AccessPath.equal_raw ap1 ap2)
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then
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failwithf "Id %a maps to both %a and %a@."
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Var.pp id
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AccessPath.pp_raw ap1
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AccessPath.pp_raw ap2
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let join astate1 astate2 =
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if phys_equal astate1 astate2
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then astate1
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else
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IdMap.merge
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(fun var ap1_opt ap2_opt -> match ap1_opt, ap2_opt with
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| Some ap1, Some ap2 ->
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if Config.debug_exceptions then check_invariant ap1 ap2 var;
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ap1_opt
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| Some _, None -> ap1_opt
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| None, Some _ -> ap2_opt
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| None, None -> None)
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astate1
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astate2
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let widen ~prev ~next ~num_iters:_ =
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join prev next
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