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Fix base must-writing all invalidated variables #1562

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Sep 9, 2024
Merged

Fix base must-writing all invalidated variables #1562

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24 changes: 16 additions & 8 deletions src/analyses/base.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -2045,7 +2045,7 @@ struct
List.map mpt exps
)

let invalidate ?(deep=true) ~ctx (st:store) (exps: exp list): store =
let invalidate ~(must: bool) ?(deep=true) ~ctx (st:store) (exps: exp list): store =
if M.tracing && exps <> [] then M.tracel "invalidate" "Will invalidate expressions [%a]" (d_list ", " d_plainexp) exps;
if exps <> [] then M.info ~category:Imprecise "Invalidating expressions: %a" (d_list ", " d_exp) exps;
(* To invalidate a single address, we create a pair with its corresponding
Expand All @@ -2072,7 +2072,15 @@ struct
let vs = List.map (Tuple3.third) invalids' in
M.tracel "invalidate" "Setting addresses [%a] to values [%a]" (d_list ", " AD.pretty) addrs (d_list ", " VD.pretty) vs
);
set_many ~ctx st invalids'
(* copied from set_many *)
let f (acc: store) ((lval:AD.t),(typ:Cil.typ),(value:value)): store =
let acc' = set ~ctx acc lval typ value in
if must then
acc'
else
D.join acc acc'
in
List.fold_left f st invalids'


let make_entry ?(thread=false) (ctx:(D.t, G.t, C.t, V.t) Analyses.ctx) fundec args: D.t =
Expand Down Expand Up @@ -2211,8 +2219,8 @@ struct
in
(* TODO: what about escaped local variables? *)
(* invalidate arguments and non-static globals for unknown functions *)
let st' = invalidate ~deep:false ~ctx ctx.local shallow_addrs in
invalidate ~deep:true ~ctx st' deep_addrs
let st' = invalidate ~must:false ~deep:false ~ctx ctx.local shallow_addrs in
invalidate ~must:false ~deep:true ~ctx st' deep_addrs

let check_invalid_mem_dealloc ctx special_fn ptr =
let has_non_heap_var = AD.exists (function
Expand Down Expand Up @@ -2302,7 +2310,7 @@ struct
let invalidate_ret_lv st = match lv with
| Some lv ->
if M.tracing then M.tracel "invalidate" "Invalidating lhs %a for function call %s" d_plainlval lv f.vname;
invalidate ~deep:false ~ctx st [Cil.mkAddrOrStartOf lv]
invalidate ~must:true ~deep:false ~ctx st [Cil.mkAddrOrStartOf lv]
| None -> st
in
let addr_type_of_exp exp =
Expand Down Expand Up @@ -2636,14 +2644,14 @@ struct
| Int n when GobOption.exists (Z.equal Z.zero) (ID.to_int n) -> st
| Address ret_a ->
begin match eval_rv ~ctx st id with
| Thread a when ValueDomain.Threads.is_top a -> invalidate ~ctx st [ret_var]
| Thread a when ValueDomain.Threads.is_top a -> invalidate ~must:true ~ctx st [ret_var]
| Thread a ->
let v = List.fold VD.join (VD.bot ()) (List.map (fun x -> G.thread (ctx.global (V.thread x))) (ValueDomain.Threads.elements a)) in
(* TODO: is this type right? *)
set ~ctx st ret_a (Cilfacade.typeOf ret_var) v
| _ -> invalidate ~ctx st [ret_var]
| _ -> invalidate ~must:true ~ctx st [ret_var]
end
| _ -> invalidate ~ctx st [ret_var]
| _ -> invalidate ~must:true ~ctx st [ret_var]
in
let st' = invalidate_ret_lv st' in
Priv.thread_join (Analyses.ask_of_ctx ctx) (priv_getg ctx.global) id st'
Expand Down
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