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feat(dpor): implement dynamic property-aware partial order reduction (Spec 15) - #55
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…(Spec 15) - Establish Spec 15 in docs/specs/active/15-property-aware-dpor/ with formal soundness proof, visibility contract, and verification matrix - Expose IndependenceRelation.writesOverlap() as public for cross-package visibility - Update DporExplorer to apply property visibility when Invariant.observedLocations() is present: * Visible candidate steps never enter sleep sets (Rule 1) * Visible step execution refreshes sleeping transitions (Rule 2) * Independent invisible steps are pruned via sleep sets * Retain exhaustive dfsDfs fallback for unknown observations and DSL final checks (Rule 3) - Add DporPropertyAwarenessTest exercising reduction, visible races, sleep set refresh, and differential equivalence across all BugCorpus benchmarks Co-authored-by: Gemini <gemini@google.com>
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Docstring coverage is 44.44% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 27 functions across 3 files. (5 skipped: … | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Title check The title clearly identifies the main change: implementing dynamic property-aware partial order reduction under Spec 15. Description check The description is directly related to the changeset and explains the Spec 15 documentation, engine changes, fallback behavior, and verification coverage. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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Docstring coverage is 44.44% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 27 functions across 3 files. (5 skipped: 5 unsupported.)
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Actionable comments posted: 6
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at
@docs/specs/active/15-property-aware-dpor/03-verification-and-benchmarks.md:
- Around line 37-40: Update the benchmark list to match the entries actually
returned by BugCorpus.all(): remove producer-consumer-bounded, circular-buffer,
and dining-philosophers, and list double-checked locking, the second lost-update
variant, and torn-counter benchmarks with their expected outcomes based on the
corpus entries.
- Line 19: The verification matrix claims coverage for
`dslAlwaysPropertyAppliesPropertyAwareReduction`, but that test is absent from
`DporPropertyAwarenessTest`. Add a focused DSL `always` test that verifies both
reduced state count and independently expected outcomes, or mark the matrix
check as pending until the test exists.
- Around line 24-28: Align the differential-oracle claims with implemented
checks: add a state-count monotonicity assertion to
bugCorpusAllVerdictsPreserved, and revise the scope description so it does not
claim parameterized tests that are absent. If these checks are not implemented,
describe them as planned rather than completed.
Review comments at @README.md:
- Line 160: Update the earlier DPOR guidance to match the summary: clarify that
annotated invariants with complete observations can use property-aware DPOR
pruning, while predicates with unknown or unannotated observations retain
exhaustive fallback. Replace the claim that DPOR’s invariant fallback is
unchanged with this distinction.
Review comments at
@src/test/java/dev/samhb/interleave/dpor/DporPropertyAwarenessTest.java:
- Line 188: Update the state-count assertion in DporPropertyAwarenessTest to
require dpor.statesExplored() to be strictly less than dfs.statesExplored() for
the empty observation set, while preserving the existing outcome comparison.
- Line 254: Add meaningful Javadoc to the private `locations` and `outcomes`
helpers, describing each helper’s input and the set it returns.
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README.mddocs/specs/active/15-property-aware-dpor/01-property-visibility-dpor.mddocs/specs/active/15-property-aware-dpor/02-soundness-proof.mddocs/specs/active/15-property-aware-dpor/03-verification-and-benchmarks.mddocs/specs/active/15-property-aware-dpor/README.mdsrc/main/java/dev/samhb/interleave/dpor/DporExplorer.javasrc/main/java/dev/samhb/interleave/por/IndependenceRelation.javasrc/test/java/dev/samhb/interleave/dpor/DporPropertyAwarenessTest.java
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AGENTS.md — auto-discovered
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Apply implementation criteria to production and example code.
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src/main/java/dev/samhb/interleave/por/IndependenceRelation.javasrc/main/java/dev/samhb/interleave/dpor/DporExplorer.java
Review tests and fixtures for their ability to detect plausible regressions in the behavior or contract under test.
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src/test/java/dev/samhb/interleave/dpor/DporPropertyAwarenessTest.java
Check documented behavior, examples, commands, configuration, and requirements against implementation and available evidence.
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README.mddocs/specs/active/15-property-aware-dpor/README.mddocs/specs/active/15-property-aware-dpor/03-verification-and-benchmarks.mddocs/specs/active/15-property-aware-dpor/02-soundness-proof.mddocs/specs/active/15-property-aware-dpor/01-property-visibility-dpor.md
Prioritize correctness, security, data integrity, and user-visible regressions.
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Files:
README.mddocs/specs/active/15-property-aware-dpor/README.mdsrc/main/java/dev/samhb/interleave/por/IndependenceRelation.javadocs/specs/active/15-property-aware-dpor/03-verification-and-benchmarks.mddocs/specs/active/15-property-aware-dpor/02-soundness-proof.mdsrc/main/java/dev/samhb/interleave/dpor/DporExplorer.javadocs/specs/active/15-property-aware-dpor/01-property-visibility-dpor.mdsrc/test/java/dev/samhb/interleave/dpor/DporPropertyAwarenessTest.java
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Files:
src/main/java/dev/samhb/interleave/por/IndependenceRelation.javasrc/main/java/dev/samhb/interleave/dpor/DporExplorer.javasrc/test/java/dev/samhb/interleave/dpor/DporPropertyAwarenessTest.java
🪛 LanguageTool
docs/specs/active/15-property-aware-dpor/README.md
[style] ~15-~15: Three successive sentences begin with the same word. Consider rewording the sentence or use a thesaurus to find a synonym.
Context: ...on detection or deadlock detection. ## Spec Set Structure | Document | Title | Foc...
(ENGLISH_WORD_REPEAT_BEGINNING_RULE)
docs/specs/active/15-property-aware-dpor/02-soundness-proof.md
[style] ~19-~19: ‘with respect to’ might be wordy. Consider a shorter alternative.
Context: ...on Invariance) If step
(EN_WORDINESS_PREMIUM_WITH_RESPECT_TO)
[style] ~42-~42: ‘exact same’ might be wordy. Consider a shorter alternative.
Context: ...sigma)) }$. Both schedules visit the exact same set of invariant valuations. $\blacksqu...
(EN_WORDINESS_PREMIUM_EXACT_SAME)
[style] ~58-~58: Three successive sentences begin with the same word. Consider rewording the sentence or use a thesaurus to find a synonym.
Context: ...o sleep (independence requirement). - If
(ENGLISH_WORD_REPEAT_BEGINNING_RULE)
🪛 markdownlint-cli2 (0.23.3)
docs/specs/active/15-property-aware-dpor/02-soundness-proof.md
[warning] 18-18: Headings should be surrounded by blank lines
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docs/specs/active/15-property-aware-dpor/01-property-visibility-dpor.md
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Graphify reviewed this change.
Worth a look — the grounded gate found no coupling regressions or blocking issues, but 2 advisory finding(s) below merit a look before merge.
Not checked: tests were not run; no formal proof of the changed code.
Graphify review — findings
Adds property-aware sleep-set pruning to DporExplorer. When an invariant declares its observed locations, only steps whose writes overlap them are treated as visible: visible steps never enter a sleep set and executing one clears it, while invisible independent steps can still be pruned. Invariants with unknown observations (and DSL final assertions) fall back to unreduced DFS, though the pruning in dporDfs is combined with visited-state deduplication and that interaction is where a missed violation could hide. Adds the Spec 15 documents (visibility contract, soundness proof, verification matrix and benchmarks) plus a README pointer, and a DporPropertyAwarenessTest suite covering reduction, intermediate-violation preservation and the exhaustive fallback. The proof's Theorem 1 does not account for the visited-state store, and the verification matrix names tests the suite may not contain.
Worth a look
- Sleep sets combined with visited-state pruning can miss invariant violations —
src/main/java/dev/samhb/interleave/dpor/DporExplorer.java:133· Escalate · medium- agreed by 2 of 2 members but NOT verified (no proof, no reproducing execution) — consensus is not a verdict; needs human review
- Soundness proof ignores the interaction between sleep sets and the visited-state store —
docs/specs/active/15-property-aware-dpor/02-soundness-proof.md:47· Escalate · medium- agreed by 2 of 2 members but NOT verified (no proof, no reproducing execution) — consensus is not a verdict; needs human review
Review partial — this diff was larger than one review pass covers, so later files were not reviewed; some findings may be missing.
Analysis details — impact, health, verification
Impact & health
Graphify review
Impact — 110 functions depend on the 101 functions this change touches.
Health — grade A; no new coupling hotspots.
Verification — 110 functions in the blast radius were not formally verified this run (proofs are advisory here).
Gate & verification
graphify gate
PASS — objectively clean (no health regressions, tests not run — proofs not run this pass (advisory)). Grounded, not self-assessed.
Advisory (not blocking):
- verification_scope: 110 function(s) in the blast radius were not formally verified this run
- Align 03-verification-and-benchmarks.md with exact BugCorpus.all() entries - Add dslAlwaysPropertyAppliesPropertyAwareReduction test for declarative always invariants - Strengthen emptyObservationsReducesCompletely to strictly assert reduction (<) - Add state-count monotonicity assertions across corpus benchmark checks - Add proof section in 02-soundness-proof.md for sleep-set and state-store interaction - Update README.md line 34 to reflect property-aware DPOR reduction - Add 100% complete Javadocs across DporPropertyAwarenessTest Co-authored-by: Gemini <gemini@google.com>
Co-authored-by: Gemini <gemini@google.com>
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Summary
This PR establishes Spec 15 and implements Dynamic Property-Aware Partial Order Reduction (Item 8) in
DporExplorer.Historically,
DporExplorercompletely disabled sleep-set reduction whenever an invariant was provided, falling back to unreduced exhaustive DFS (dfsDfs). This PR integrates state-property visibility into DPOR, enabling sleep-set pruning of independent invisible operations while strictly preserving violation detection and exhaustive fallback for unannotated properties.Key Changes
Spec 15 Suite:
docs/specs/active/15-property-aware-dpor/README.md: Overview, goals, acceptance criteria, and map.01-property-visibility-dpor.md: Visibility contract, sleep-set operational rules, and API dispatch.02-soundness-proof.md: Mathematical proof of violation preservation under finite-trace commutativity.03-verification-and-benchmarks.md: Test matrix, differential oracles, and BugCorpus results.Core Engine:
IndependenceRelation.java: ExposeswritesOverlapaspublicfor cross-package visibility checks.DporExplorer.java:Invariant.observedLocations():Optional.empty(): retains exhaustivedfsDfsfallback (unannotated callbacks, DSLfinal).Optional.of(locations): applies property-aware DPOR (dporDfswith observation footprint).nullinvariant: retains standard unconstrained DPOR.new SleepSet()), ensuring all subsequent actions observe the updated property state.Verification:
DporPropertyAwarenessTest.javawith 9 targeted contracts:statesExplored < dfs.statesExplored).visibleIndependentWritesCannotHideIntermediateViolations).visibleStepRefreshesSleepSet).finalexhaustive fallback preservation.DfsExplorerandStaticPorExplorer.BugCorpus.all()../gradlew check javadocand visualizer e2e check.