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Prove DstLayout padding and field extension #3838

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Prove DstLayout padding and field extension #3838

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5 changes: 4 additions & 1 deletion verification/aeneas/README.md
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Expand Up @@ -268,7 +268,7 @@ whole-program unsafe-code certification.

## Scope and proofs

Rust review entry points: [arithmetic assertions](../../zerocopy/src/util/checks.rs), [nested reference](../../zerocopy/src/layout/nested_reference.rs), [primitive assertions](../../zerocopy/src/layout/primitive_checks.rs), [tail assertions](../../zerocopy/src/layout/tail_checks.rs).
Rust review entry points: [arithmetic assertions](../../zerocopy/src/util/checks.rs), [nested reference](../../zerocopy/src/layout/nested_reference.rs), [primitive assertions](../../zerocopy/src/layout/primitive_checks.rs), [tail assertions](../../zerocopy/src/layout/tail_checks.rs), [composition assertions](../../zerocopy/src/layout/composition_checks.rs).

Extraction starts from the function and nominal-type owners of every present
`aeneas` fence in `zerocopy/src`, including their dependencies. The current
Expand Down Expand Up @@ -361,6 +361,9 @@ See [SEMANTICS.md](SEMANTICS.md) for the Rust correspondence premise.
The checked trailing-size and padding contracts connect machine arithmetic
to the independent recursive semantics.

Extension and normalized padding preserve complete inner sizes, including
padding inside packed fields.

Plain arithmetic clauses use mathematical word values carrying machine bounds
and, for NonZero, positivity. They coerce to `Nat` or `Int` without unwrapping
raw fields. Binding `let N : Nat := n` makes addition and remainder ordinary
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