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Prove normalized layout padding and field extension #3753

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Prove normalized layout padding and field extension #3753

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6 changes: 5 additions & 1 deletion verification/aeneas/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -127,7 +127,7 @@ zerocopy's unsafe pointer operations are sound.

## 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. Every present
Expand All @@ -144,6 +144,7 @@ added without extending the specification set.
| `SizeInfo::try_to_nonzero_elem_size`, `max_elems_for_bytes` | Exact zero handling, preserved representation fields, and greatest fitting element count. |
| `DstLayout::requires_static_padding` | Exact negation of the recorded shallow-unpadded flag. |
| Trailing size, padding, and capacity | Exact size-offset and capacity formulas, checked-size overflow, and wrapping padding; successful sizes and physical padding refine the independent recursive semantics. |
| `DstLayout::{extend,pad_to_align}` | Exact field placement, alignment, padding flags, and normalized size formulas; outer padding preserves each field's complete inner size. |

Every registered function uses total `spec`: accepted raw representations,
supplied mathematical ghosts, and explicit requirements imply successful
Expand Down Expand Up @@ -175,6 +176,9 @@ 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 NonZero positivity. Their Nat/Int arithmetic does not wrap; explicit raw
clauses preserve the extracted representation vocabulary while retaining
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