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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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3 changes: 2 additions & 1 deletion src/cdomains/apron/sharedFunctions.apron.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -274,7 +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 ->
| Some vinfo when IntDomain.Size.is_cast_injective ~from_type:vinfo.vtype ~to_type:(TInt(ILongLong,[])) ->
(* TODO: What to do with variables that have a type that cannot be stored into ILongLong to avoid overflows? *)
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let var = Cilfacade.mkCast ~e:(Lval(Var vinfo,NoOffset)) ~newt:longlong in
let coeff, flip = coeff_to_const true c in
Expand All @@ -284,6 +284,7 @@ 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
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