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Check overflows when generating witnesses #1546

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merged 2 commits into from
Jul 17, 2024
Merged

Check overflows when generating witnesses #1546

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14d51d5
Check overflows when generating witnesses
michael-schwarz Jul 12, 2024
06ea5e0
Rm resolved TODO
michael-schwarz Jul 17, 2024
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6 changes: 3 additions & 3 deletions src/cdomains/apron/sharedFunctions.apron.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -274,8 +274,7 @@ struct
let expr = ref (fst @@ coeff_to_const false (Linexpr1.get_cst linexpr1)) in
let append_summand (c:Coeff.union_5) v =
match V.to_cil_varinfo v with
| Some vinfo ->
(* TODO: What to do with variables that have a type that cannot be stored into ILongLong to avoid overflows? *)
| Some vinfo when IntDomain.Size.is_cast_injective ~from_type:vinfo.vtype ~to_type:(TInt(ILongLong,[])) ->
let var = Cilfacade.mkCast ~e:(Lval(Var vinfo,NoOffset)) ~newt:longlong in
let coeff, flip = coeff_to_const true c in
let prod = BinOp(Mult, coeff, var, longlong) in
Expand All @@ -284,13 +283,14 @@ struct
else
expr := BinOp(PlusA,!expr,prod,longlong)
| None -> M.warn ~category:Analyzer "Invariant Apron: cannot convert to cil var: %s" (Var.to_string v); raise Unsupported_Linexpr1
| _ -> M.warn ~category:Analyzer "Invariant Apron: cannot convert to cil var in overflow preserving manner: %s" (Var.to_string v); raise Unsupported_Linexpr1
in
Linexpr1.iter append_summand linexpr1;
!expr


let lcm_den linexpr1 =
let exception UnsupportedScalar
let exception UnsupportedScalar
in
let frac_of_scalar scalar =
if Scalar.is_infty scalar <> 0 then (* infinity means unbounded *)
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