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simplifying use of process_splitting by moving normalization inside

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Reviewed By: cristianoc, jeremydubreil

Differential Revision: D2686422

fb-gh-sync-id: a220110
master
Sam Blackshear 9 years ago committed by facebook-github-bot-7
parent 37d2e84192
commit a6543cd665
1 changed files with 78 additions and 72 deletions
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140
infer/src/backend/tabulation.ml
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@ -119,13 +119,7 @@ let spec_find_rename trace_call (proc_name : Procname.t) : (int * Prop.exposed S
raise (Exceptions.Precondition_not_found (Localise.verbatim_desc (Procname.to_string proc_name), try assert false with Assert_failure x -> x))
end
(** Process a splitting coming straight from a call to the prover:
change the instantiating substitution so that it returns primed vars,
except for vars occurring in the missing part, where it returns
footprint vars. *)
let process_splitting actual_pre sub1 sub2 frame missing_pi missing_sigma frame_fld missing_fld frame_typ missing_typ =
(*
let check_precondition () =
let check_splitting_precondition sub1 sub2 =
let dom1 = Sil.sub_domain sub1 in
let rng1 = Sil.sub_range sub1 in
let dom2 = Sil.sub_domain sub2 in
@ -137,11 +131,19 @@ let process_splitting actual_pre sub1 sub2 frame missing_pi missing_sigma frame_
L.d_str "Dom(Sub2): "; Sil.d_exp_list (IList.map (fun id -> Sil.Var id) dom2); L.d_ln ();
L.d_str "Ran(Sub2): "; Sil.d_exp_list rng2; L.d_ln ();
assert false
end in
check_precondition ();
*)
let sub = Sil.sub_join sub1 sub2 in
end
(** Process a splitting coming straight from a call to the prover:
change the instantiating substitution so that it returns primed vars,
except for vars occurring in the missing part, where it returns
footprint vars. *)
let process_splitting actual_pre sub1 sub2 frame missing_pi missing_sigma frame_fld missing_fld frame_typ missing_typ =
let hpred_has_only_footprint_vars hpred =
let fav = Sil.fav_new () in
Sil.hpred_fav_add fav hpred;
Sil.fav_for_all fav Ident.is_footprint in
let sub = Sil.sub_join sub1 sub2 in
let sub1_inverse =
let sub1_list = Sil.sub_to_list sub1 in
let sub1_list' = IList.filter (function (_, Sil.Var _) -> true | _ -> false) sub1_list in
@ -205,7 +207,38 @@ let process_splitting actual_pre sub1 sub2 frame missing_pi missing_sigma frame_
let sub_list' =
IList.map (fun (id, e) -> (id, Sil.exp_sub sub1 e)) sub_list in
let sub' = Sil.sub_of_list (sub2_list @ sub_list') in
{ sub = sub'; frame = frame; missing_pi = missing_pi; missing_sigma = missing_sigma; frame_fld = frame_fld; missing_fld = missing_fld; frame_typ = frame_typ; missing_typ = missing_typ }
(* normalize everything w.r.t sub' *)
let norm_missing_pi = Prop.pi_sub sub' missing_pi in
let norm_missing_sigma = Prop.sigma_sub sub' missing_sigma in
let norm_frame_fld = Prop.sigma_sub sub' frame_fld in
let norm_frame_typ =
IList.map (fun (e, te) -> Sil.exp_sub sub' e, Sil.exp_sub sub' te) frame_typ in
let norm_missing_typ =
IList.map (fun (e, te) -> Sil.exp_sub sub' e, Sil.exp_sub sub' te) missing_typ in
let norm_missing_fld =
let sigma = Prop.sigma_sub sub' missing_fld in
let filter hpred =
if not (hpred_has_only_footprint_vars hpred) then
begin
L.d_warning "Missing fields hpred has non-footprint vars: "; Sil.d_hpred hpred; L.d_ln ();
false
end
else match hpred with
| Sil.Hpointsto(Sil.Var id, _, _) -> true
| Sil.Hpointsto(Sil.Lvar pvar, _, _) -> Sil.pvar_is_global pvar
| _ ->
L.d_warning "Missing fields in complex pred: "; Sil.d_hpred hpred; L.d_ln ();
false in
IList.filter filter sigma in
let norm_frame = Prop.sigma_sub sub' frame in
{ sub = sub';
frame = norm_frame;
missing_pi = norm_missing_pi;
missing_sigma = norm_missing_sigma;
frame_fld = norm_frame_fld;
missing_fld = norm_missing_fld;
frame_typ = norm_frame_typ;
missing_typ = norm_missing_typ; }
(** Check whether an inst represents a dereference without null check, and return the line number and path position *)
let find_dereference_without_null_check_in_inst = function
@ -344,11 +377,6 @@ let post_process_post
check_path_errors_in_post caller_pname post' post_path;
post', post_path
let hpred_has_only_footprint_vars hpred =
let fav = Sil.fav_new () in
Sil.hpred_fav_add fav hpred;
Sil.fav_for_all fav Ident.is_footprint
let hpred_lhs_compare hpred1 hpred2 = match hpred1, hpred2 with
| Sil.Hpointsto(e1, _, _), Sil.Hpointsto(e2, _, _) -> Sil.exp_compare e1 e2
| Sil.Hpointsto _, _ -> - 1
@ -610,27 +638,6 @@ let combine
actual_pre path_pre split
caller_pdesc callee_pname loc =
let caller_pname = Cfg.Procdesc.get_proc_name caller_pdesc in
let new_footprint_pi = Prop.pi_sub split.sub split.missing_pi in
let new_footprint_sigma = Prop.sigma_sub split.sub split.missing_sigma in
let new_frame_fld = Prop.sigma_sub split.sub split.frame_fld in
let new_frame_typ = IList.map (fun (e, te) -> Sil.exp_sub split.sub e, Sil.exp_sub split.sub te) split.frame_typ in
let new_missing_typ = IList.map (fun (e, te) -> Sil.exp_sub split.sub e, Sil.exp_sub split.sub te) split.missing_typ in
let new_missing_fld =
let sigma = Prop.sigma_sub split.sub split.missing_fld in
let filter hpred =
if not (hpred_has_only_footprint_vars hpred) then
begin
L.d_warning "Missing fields hpred has non-footprint vars: "; Sil.d_hpred hpred; L.d_ln ();
false
end
else match hpred with
| Sil.Hpointsto(Sil.Var id, _, _) -> true
| Sil.Hpointsto(Sil.Lvar pvar, _, _) -> Sil.pvar_is_global pvar
| _ ->
L.d_warning "Missing fields in complex pred: "; Sil.d_hpred hpred; L.d_ln ();
false in
IList.filter filter sigma in
let instantiated_frame = Prop.sigma_sub split.sub split.frame in
let instantiated_post =
let posts' =
if !Config.footprint && posts = []
@ -653,20 +660,20 @@ let combine
caller_pname callee_pname loc actual_pre (Prop.prop_sub split.sub p, path)))
posts' in
L.d_increase_indent 1;
L.d_strln "New footprint:"; Prop.d_pi_sigma new_footprint_pi new_footprint_sigma; L.d_ln ();
L.d_strln "Frame fld:"; Prop.d_sigma new_frame_fld; L.d_ln ();
if new_frame_typ <> [] then L.d_strln "Frame typ:"; Prover.d_typings new_frame_typ; L.d_ln ();
L.d_strln "Missing fld:"; Prop.d_sigma new_missing_fld; L.d_ln ();
if new_frame_typ <> [] then L.d_strln "Missing typ:"; Prover.d_typings new_missing_typ; L.d_ln ();
L.d_strln "Instantiated frame:"; Prop.d_sigma instantiated_frame; L.d_ln ();
L.d_strln "New footprint:"; Prop.d_pi_sigma split.missing_pi split.missing_sigma; L.d_ln ();
L.d_strln "Frame fld:"; Prop.d_sigma split.frame_fld; L.d_ln ();
if split.frame_typ <> [] then begin L.d_strln "Frame typ:"; Prover.d_typings split.frame_typ; L.d_ln () end;
L.d_strln "Missing fld:"; Prop.d_sigma split.missing_fld; L.d_ln ();
if split.missing_typ <> [] then begin L.d_strln "Missing typ:"; Prover.d_typings split.missing_typ; L.d_ln (); end;
L.d_strln "Instantiated frame:"; Prop.d_sigma split.frame; L.d_ln ();
L.d_strln "Instantiated post:"; Propgraph.d_proplist Prop.prop_emp (IList.map fst instantiated_post);
L.d_decrease_indent 1; L.d_ln ();
let compute_result post_p =
let post_p' =
let post_sigma = sigma_star_fld (Prop.get_sigma post_p) new_frame_fld in
let post_sigma' = sigma_star_typ post_sigma new_frame_typ in
let post_sigma = sigma_star_fld (Prop.get_sigma post_p) split.frame_fld in
let post_sigma' = sigma_star_typ post_sigma split.frame_typ in
Prop.replace_sigma post_sigma' post_p in
let post_p1 = Prop.prop_sigma_star (prop_copy_footprint_pure actual_pre post_p') instantiated_frame in
let post_p1 = Prop.prop_sigma_star (prop_copy_footprint_pure actual_pre post_p') split.frame in
let handle_null_case_analysis sigma =
let id_assigned_to_null id =
@ -674,7 +681,7 @@ let combine
| Sil.Aeq (Sil.Var id', Sil.Const (Sil.Cint i)) ->
Ident.equal id id' && Sil.Int.isnull i
| _ -> false in
IList.exists filter new_footprint_pi in
IList.exists filter split.missing_pi in
let f (e, inst_opt) = match e, inst_opt with
| Sil.Var id, Some inst when id_assigned_to_null id ->
let inst' = Sil.inst_set_null_case_flag inst in
@ -686,7 +693,7 @@ let combine
let post_p1_sigma = Prop.get_sigma post_p1 in
let post_p1_sigma' = handle_null_case_analysis post_p1_sigma in
let post_p1' = Prop.replace_sigma post_p1_sigma' post_p1 in
Prop.normalize (Prop.replace_pi (Prop.get_pi post_p1 @ new_footprint_pi) post_p1') in
Prop.normalize (Prop.replace_pi (Prop.get_pi post_p1 @ split.missing_pi) post_p1') in
let post_p3 = (** replace [result|callee] with an aux variable dedicated to this proc *)
let callee_ret_pvar =
@ -723,7 +730,12 @@ let combine
let post_p4 =
if !Config.footprint
then
prop_footprint_add_pi_sigma_starfld_sigma post_p3 new_footprint_pi new_footprint_sigma new_missing_fld new_missing_typ
prop_footprint_add_pi_sigma_starfld_sigma
post_p3
split.missing_pi
split.missing_sigma
split.missing_fld
split.missing_typ
else Some post_p3 in
post_p4 in
let _results = IList.map (fun (p, path) -> (compute_result p, path)) instantiated_post in
@ -758,10 +770,8 @@ let mk_actual_precondition prop actual_params formal_params =
let inconsistent_actualpre_missing actual_pre split_opt =
match split_opt with
| Some split ->
let norm_missing_pi = Prop.pi_sub split.sub split.missing_pi in
let norm_missing_sigma = Prop.sigma_sub split.sub split.missing_sigma in
let prop'= Prop.normalize (Prop.prop_sigma_star actual_pre norm_missing_sigma) in
let prop''= IList.fold_left Prop.prop_atom_and prop' norm_missing_pi in
let prop'= Prop.normalize (Prop.prop_sigma_star actual_pre split.missing_sigma) in
let prop''= IList.fold_left Prop.prop_atom_and prop' split.missing_pi in
Prover.check_inconsistency prop''
| None -> false
@ -916,12 +926,8 @@ let exe_spec
if !Config.taint_analysis then
do_taint_check caller_pname callee_pname actual_pre missing_pi sub2 prop
else missing_pi in
let split = process_splitting actual_pre sub1 sub2 frame missing_pi' missing_sigma frame_fld missing_fld frame_typ missing_typ in
d_splitting split; L.d_ln ();
let norm_missing_pi = Prop.pi_sub split.sub split.missing_pi in
let norm_missing_sigma = Prop.sigma_sub split.sub split.missing_sigma in
(split, norm_missing_pi, norm_missing_sigma) in
let report_valid_res split norm_missing_pi norm_missing_sigma =
process_splitting actual_pre sub1 sub2 frame missing_pi' missing_sigma frame_fld missing_fld frame_typ missing_typ in
let report_valid_res split =
match combine
cfg ret_ids posts
actual_pre path_pre split
@ -934,8 +940,8 @@ let exe_spec
IList.partition (fun (p, _) -> Prover.check_inconsistency p) results in
let incons_pre_missing = inconsistent_actualpre_missing actual_pre (Some split) in
Valid_res { incons_pre_missing = incons_pre_missing;
vr_pi = norm_missing_pi;
vr_sigma = norm_missing_sigma;
vr_pi = split.missing_pi;
vr_sigma = split.missing_sigma;
vr_cons_res = consistent_results;
vr_incons_res = inconsistent_results } in
begin
@ -943,8 +949,8 @@ let exe_spec
let subbed_pre = (Prop.prop_sub sub1 actual_pre) in
match check_dereferences callee_pname subbed_pre sub2 spec_pre formal_params with
| Some (Deref_undef _, _) when !Config.angelic_execution ->
let (split, norm_missing_pi, norm_missing_sigma) = do_split () in
report_valid_res split norm_missing_pi norm_missing_sigma
let split = do_split () in
report_valid_res split
| Some (deref_error, desc) ->
let rec join_paths = function
| [] -> None
@ -955,7 +961,7 @@ let exe_spec
let pjoin = join_paths posts in (* join the paths from the posts *)
Invalid_res (Dereference_error (deref_error, desc, pjoin))
| None ->
let (split, norm_missing_pi, norm_missing_sigma) = do_split () in
let split = do_split () in
(* check if a missing_fld hpred is about a hidden field *)
let hpred_missing_hidden = function
| Sil.Hpointsto (_, Sil.Estruct ([(fld, _)], _), _) -> Ident.fieldname_is_hidden fld
@ -963,7 +969,7 @@ let exe_spec
(* missing fields minus hidden fields *)
let missing_fld_nohidden =
IList.filter (fun hp -> not (hpred_missing_hidden hp)) missing_fld in
if !Config.footprint = false && norm_missing_sigma != [] then
if !Config.footprint = false && split.missing_sigma != [] then
begin
L.d_strln "Implication error: missing_sigma not empty in re-execution";
Invalid_res Missing_sigma_not_empty
@ -973,7 +979,7 @@ let exe_spec
L.d_strln "Implication error: missing_fld not empty in re-execution";
Invalid_res Missing_fld_not_empty
end
else report_valid_res split norm_missing_pi norm_missing_sigma
else report_valid_res split
end
let remove_constant_string_class prop =

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