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Jul 2, 2025
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Add assumption about array index reads #1772

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Add assumption about array index reads
sim642 Jul 1, 2025
aed73d2
Add "the" before option in array bounds assumption
sim642 Jul 1, 2025
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20 changes: 20 additions & 0 deletions docs/user-guide/assumptions.md
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Expand Up @@ -49,5 +49,25 @@ _NB! This list is likely incomplete._

This affects the `base` analysis.

See [issue #1770](https://github.com/goblint/analyzer/issues/1770).

4. Array index reads are in bounds.

[C11's N1570][n1570] at J.2 states that

> The behavior is undefined in the following circumstances:
>
> - [...]
> - An array subscript is out of range, even if an object is apparently accessible with the given subscript (as in the lvalue expression `a[1][7]` given the declaration `int a[4][5]`) (6.5.6).

after a long list of undefined behaviors.

Goblint does not by default report reading from out of bounds array indices.
Goblint reports out of bounds array index accesses when the `ana.arrayoob` option is enabled.

This affects the `base` analysis.

See [issue #1702](https://github.com/goblint/analyzer/issues/1702).


[n1570]: https://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf
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