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Relational: Assert type bounds after branch #1698

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Relational: Assert type bounds after branch #1698

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15c2c74
Relational: Assert type bounds after `branch`
michael-schwarz Feb 27, 2025
d0298f5
Use translated expression
michael-schwarz Feb 27, 2025
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2 changes: 2 additions & 0 deletions src/analyses/apron/relationAnalysis.apron.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -272,6 +272,8 @@ struct
RD.assert_inv ask rel' e' (not b) (no_overflow ask e)
)
in
let vars = Basetype.CilExp.get_vars e |> List.unique ~eq:CilType.Varinfo.equal |> List.filter RD.Tracked.varinfo_tracked in
let res = List.fold_left (assert_type_bounds ask) res vars in
if RD.is_bot_env res then raise Deadcode;
{st with rel = res}

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23 changes: 23 additions & 0 deletions tests/regression/24-octagon/18-dead.c
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Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
//SKIP PARAM: --enable ana.int.interval --set ana.activated[+] apron
// NOCRASH (was arithmetic on bottom)
int main(void)
{
int a;
unsigned short b;
int tmp;

b = (unsigned short )a;

if ((int )b + (int )b < (int )b) {

tmp = (int )b;
b += 1;

if (! tmp) {
tmp = 1;
}

}

return 0;
}
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