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Retain only source backing guard after exact policy transfer

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sorokin.oleg.edu
2026-09-24 17:28:48 -07:00
parent d11b99bb4a
commit fa7a980418
4 changed files with 56 additions and 19 deletions
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harness/analysis-carried-phase-implementation-20260925.md
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@@ -19,3 +19,13 @@ Zero carried mode intentionally refuses E cap 11 at preprojection, while legacy
No Cargo/build/test execution was performed by the implementation agent. Targeted rustfmt on owned files and raw-LF normalization are authoring checks only. Parent owns source review integration, exact-source commits, compiler/focused/full-suite gates and publication. Inherited full-suite failures and formatting issues are not addressed by this patch; parent gates will compare actual outcomes. The documented environment-sensitive upstream stack observation remains a limitation. Existing small-stack controls were not edited or waived.
Independent test-source review corrected two pre-execution fixture mistakes: use the accepted oa_property/sa_property keywords, and distinguish the parser include-edge error span 0..1 from the traversal include-depth span 0..23. These are source-review corrections, not recorded runtime failures.
## Recorded regression and slim-guard candidate
Parent's `d11b99bb` focused run passed all 12 carried tests, but its full run aborted at the unchanged `ordinary_index::tests::small_stack_success_and_late_header_failure_leave_no_partial_owner` with STATUS_STACK_OVERFLOW. The predecessor `18073a6f` full run had completed with 230 passing tests and 16 inherited failures, including that control. This is a failed current full gate, not an inherited-failure waiver or an accepted repair.
The exact-artifact LLDB trace reproduces the overflow during Windows heap allocation under formatting/Exact::parse_decimal, then exact_literal, syntax::binding, declarations::parse, State::parse_typed, Parser::unit, new parse_impl, parse_with_profile, parse, accepted/indexed helpers and the existing worker. The diagnostic child's killed exit is not a test pass. Parent measured individual prologues of parse_impl 11,144 bytes, parse_with_profile 312, accepted 1,752, indexed 1,704 and worker 7,752; these are not the complete active stack. Raw evidence remains in the parent gate records, including `carried-debugger-d11b99b-1.log` and `carried-full-d11b99b-1.stack-frames.json`.
The selected narrow candidate consumes CarriedInput before entering the shared parser. Exact captured policy transfers into Budget and syntax.limits; the retained CarriedGuard holds only Borrowed or Retained(&RetainedSnapshot). This removes the duplicate inline SnapshotPolicy payload from parsed/resolved/indexed/result carriers, while retained backing still borrows the actual allocation-owning bundle. Borrowed source identity remains bound through ParsedMixedSyntax.bundle. Explicit Some mode still distinguishes carried zero from legacy None, and all checks/reservations/Usage remain unchanged. No heap allocation or new logical storage was introduced. The parser wrapper remains uninlined and unchanged.
Only carried tests' guard-shape inspection and direct injected-arithmetic access follow the new internal guard type; all expected counts, limits, spans, outcomes and existing stack tests remain unchanged. The candidate is not claimed to establish a sole overflow cause or a successful repair before parent exact-source gates. All original failure evidence remains retained.