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Prove trailing sizes, padding and capacity including overflow - #3836

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@joshlf

@joshlf joshlf commented Oct 8, 2026 •

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Connect the extracted trailing-layout methods to independent unbounded
formulas for complete size, byte capacity and wrapping padding. Express
size_for_elems through the mathematical view and preserve exact raw
guarantees through independently checked contract implications.

Add Rust assertion harnesses comparing complete optional sizes and
capacities with remainder-based checked arithmetic. Explicit alignment and
phase witnesses identify every nonzero encoding without imposing new
physical-offset or object-size restrictions. Keep broad arithmetic lemmas
available for later composition proofs.

Authored by an AI agent acting on joshlf's behalf.


Latest Update: v31 — Compare vs v30

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Codex Review Summary

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Review Status Commit Review trigger
📝 Code Review ✅ Completed 2026-10-08T10:25:02.032242Z 63387dc PR opened
🔒 Security Review ✅ Completed 2026-10-08T10:24:55.480009Z 63387dc PR opened
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This was referenced Oct 8, 2026
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Codecov Report

❌ Patch coverage is 0% with 59 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.70%. Comparing base (b0f71c3) to head (84c7afd).

Files with missing lines Patch % Lines
zerocopy/src/layout/tail_checks.rs 0.00% 59 Missing ⚠️
Additional details and impacted files
@@                          Coverage Diff                          @@
##           Gw5blxfy2ukqgizynv5tybeaa67xgzkmj    #3836      +/-   ##
=====================================================================
- Coverage                              57.64%   56.70%   -0.94%     
=====================================================================
  Files                                     28       29       +1     
  Lines                                   3990     4049      +59     
=====================================================================
- Hits                                    2300     2296       -4     
- Misses                                  1690     1753      +63     

☔ View full report in Codecov by Harness.
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@joshlf
joshlf force-pushed the Gw5blxfy2ukqgizynv5tybeaa67xgzkmj branch from 33c6b9b to e320074 Compare October 15, 2026 00:40
@joshlf
joshlf force-pushed the Gqu6avyeazw6fkdvao6pa77ywfvvmqw5z branch from 32d401c to 37b44ea Compare October 15, 2026 00:40
@joshlf
joshlf force-pushed the Gqu6avyeazw6fkdvao6pa77ywfvvmqw5z branch from 37b44ea to abc0ada Compare October 15, 2026 01:19
@joshlf
joshlf force-pushed the Gw5blxfy2ukqgizynv5tybeaa67xgzkmj branch 2 times, most recently from 56b7eaf to 9d19a2d Compare October 15, 2026 04:53
@joshlf
joshlf force-pushed the Gqu6avyeazw6fkdvao6pa77ywfvvmqw5z branch from abc0ada to 677987b Compare October 15, 2026 04:53
@joshlf
joshlf force-pushed the Gw5blxfy2ukqgizynv5tybeaa67xgzkmj branch from 9d19a2d to d52524f Compare October 15, 2026 14:22
@joshlf
joshlf force-pushed the Gqu6avyeazw6fkdvao6pa77ywfvvmqw5z branch from 677987b to 32b8312 Compare October 15, 2026 14:22
Connect the extracted trailing-layout methods to independent unbounded
formulas for complete size, byte capacity and wrapping padding. Express
size_for_elems through the mathematical view and preserve exact raw
guarantees through independently checked contract implications.

Add Rust assertion harnesses comparing complete optional sizes and
capacities with remainder-based checked arithmetic. Explicit alignment and
phase witnesses identify every nonzero encoding without imposing new
physical-offset or object-size restrictions. Keep broad arithmetic lemmas
available for later composition proofs.

gherrit-pr-id: Gqu6avyeazw6fkdvao6pa77ywfvvmqw5z
Agent-authored-by: AI agent acting on joshlf's behalf

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