109 lines
3.9 KiB
OCaml
109 lines
3.9 KiB
OCaml
(*
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Cours "Sémantique et Application à la Vérification de programmes"
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Antoine Miné 2015
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Marc Chevalier 2018
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Josselin Giet 2021
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Ecole normale supérieure, Paris, France / CNRS / INRIA
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*)
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open Cfg
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open Domain
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let pp_asserts out a =
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ArcSet.iter (fun arc -> match arc.arc_inst with
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| CFG_assert (b, ext) -> Format.fprintf out "%a@ " Errors.pp_err (AssertFalse, ext, b)
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| _ -> failwith "Failed on non-assert") a
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module Iterator (D : DOMAIN) = struct
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(*let pp_nodes out (s,nodelist) =
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List.iter (fun node -> (Format.fprintf out "<%i>: %a@ " node.node_id D.print (node_abst node s))) nodelist
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*)
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let iterate cfg =
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let failed_asserts = ref ArcSet.empty in
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let rec do_fun (f : func) (ctx : D.t) = (*returns an abstraction of the result of exec*)
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let func_state = ref NodeMap.empty in (*avoid losing precision between function calls*)
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let func_dirty = ref NodeSet.empty in begin
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func_state := NodeMap.add f.func_entry ctx (!func_state);
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let node_abst n = try( NodeMap.find n !func_state )with Not_found -> D.bottom in
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let update_node n s =
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func_state := NodeMap.add n (D.join s (node_abst n)) !func_state in
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let rec iterate n = begin
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(*Format.printf "@[<h 0> Handling node %i@]@ " n.node_id;*)
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func_dirty := NodeSet.remove n !func_dirty;
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let curr_abst = node_abst n in
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let l = List.filter (fun x -> Node.equal x.arc_src n) cfg.cfg_arcs in begin
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List.iter (fun arc -> let s = do_inst curr_abst arc in
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if D.subset s (node_abst arc.arc_dst) then ()
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else (Format.printf "@[<h 0>Got node %i state %a@]@ " arc.arc_dst.node_id D.print s;
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update_node arc.arc_dst s; func_dirty := NodeSet.add arc.arc_dst !func_dirty)) l;
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if NodeSet.is_empty !func_dirty then () else
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iterate (NodeSet.choose !func_dirty)
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end end in
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iterate f.func_entry;
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node_abst f.func_exit;
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end
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and do_inst state arc = (* Returns a D.t describing the state we end up in after following the arc. May be bottom*)
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match arc.arc_inst with
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| CFG_skip _-> state
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| CFG_assign (v, iexpr) -> (D.assign state v iexpr)
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| CFG_guard bexpr -> D.guard state bexpr
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| CFG_assert (bexpr, _) -> (let s = D.guard state (CFG_bool_unary (AST_NOT, bexpr)) in
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if D.is_bottom s then (
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Format.printf "State %a is disjoint with %a@ " D.print state Cfg_printer.print_bool_expr (rm_negations (CFG_bool_unary (AST_NOT, bexpr)));
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state) else (
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Format.printf "Failure of guard on %a@ " D.print s;
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failed_asserts := ArcSet.add arc !failed_asserts;
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(D.guard state bexpr)))
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| CFG_call f -> do_fun f state
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in
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begin
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Format.printf "@[<v 0>";
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let init_st = do_fun {func_id = -1; func_name = "_init";
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func_pos = Lexing.dummy_pos, Lexing.dummy_pos;
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func_entry = cfg.cfg_init_entry;
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func_exit = cfg.cfg_init_exit;
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func_args = [];
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func_ret = None;
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func_calls = []} D.init in
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let rec do_main l = match l with
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| x::_ when x.func_name = "main" -> do_fun x init_st
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| _::q -> do_main q
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| [] -> failwith "function main() not found" in
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let _ = do_main cfg.cfg_funcs in
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Format.printf "@]";
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!failed_asserts
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end
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end
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open Sign
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open Constant
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open Naked
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open Value_domain
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module ConstIterator = Iterator(NonRelational(AddTopBot(Constants)))
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module SignIterator = Iterator(NonRelational(AddTopBot(Signs)))
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(*
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let iterate cfg =
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let () = Random.self_init () in
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let iter_arc arc: unit =
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match arc.arc_inst with
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| CFG_assert (b, ext) ->
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Format.printf "%a@ " Errors.pp_err (AssertFalse, ext, b)
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| _ -> () in
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(* let iter_arc arc: unit =
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match arc.arc_inst with
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| CFG_assert (b, ext) ->
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Format.printf "%a@ " Errors.pp_err (AssertFalse, ext, b)
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| _ -> () in
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let iter_node node: unit =
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Format.printf "<%i>: ⊤@ " node.node_id in
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List.iter iter_arc cfg.cfg_arcs;
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Format.printf "Node Values:@ @[<v 0>";
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List.iter iter_node cfg.cfg_nodes;
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Format.printf "@]"*)
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*)
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