Elamur Groupantswasi-gate-scenarios
The groupant beside wasi-host/examples/mlab_gate.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.
Facts
Implementation material. A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised.
Components
| component | label | where |
|---|---|---|
| approximant | partial | approximant |
| ast | partial | ../syntax.json |
| cost | symbolic source derived | invariant |
| descriptant | present | descriptant |
| invariant | partial | invariant |
| tests | compile and source review | tests |
Obernants
The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.
| id | type | label | where |
|---|---|---|---|
behavior_complement | behavior_complement | partial source derived model | behavior_complement |
reverse_reconstruction | reverse_reconstruction | partial source derived model | reverse_reconstruction |
fresh_vfs | fresh_vfs | partial source derived model | fresh_vfs |
trap_text | trap_text | partial source derived model | trap_text |
counter_relation | counter_relation | partial source derived model | counter_relation |
timing_scope | timing_scope | partial source derived model | timing_scope |
Model text
descriptant
wasi-gate-scenarios
For each parsed scenario instantiate native Vfs and interpreter, then guest argv mlab,-e,code,--fs,real plus optional --vm; merge stderr, append trap, compare n==g, increment total/times and same or diffs.
Epoch 2026-10-31
Prospective review recorded before edits. Source review found late output FAULT effects and weaker-than-capability rights metadata; these are modeled as current behavior rather than silently repaired. Only bounded new test blocks were added; production code remains unchanged. Actual finite results and exact restoration receipts live under $MOVA_DATA/runs/octopus-wave31-wasi-2026-10-31. No full mlab guest, frozen suite, GPU or corpus run. This node retains its scoped observations for future refinement.
approximant
Forward relation
For each parsed scenario instantiate native Vfs and interpreter, then guest argv mlab,-e,code,--fs,real plus optional --vm; merge stderr, append trap, compare n==g, increment total/times and same or diffs.
Scope: wasi-gate-scenarios. State and transitions follow the authoritative source, including partial effects before errors. No executable approximate replacement is attached: categorical errno/effects and module execution lack a useful validated percentage metric; future numerical profiles may only use1/2/5/10% caps after domain/reference evidence.
invariant
Invariant and cost
For each parsed scenario instantiate native Vfs and interpreter, then guest argv mlab,-e,code,--fs,real plus optional --vm; merge stderr, append trap, compare n==g, increment total/times and same or diffs.
The invariant is conditional on the admitted transition: For one completed scenario, same and diff cannot both increment; guest stdout equality with native is insufficient to exclude differing stderr before merge settings.
Cost: Sum scenario parsing and native/guest costs; captures O(output bytes), diffs retained O(total differing output).
No wall-time gain, universal resource bound or atomic rollback is inferred. External Vfs/wasmi/native-mlab work remains separately charged.
models
Typed model catalog
behavior_complement
Subject: wasi-host/examples/mlab_gate.rs at SHA-256 a7947069ab507ffd5ad7b71ae9146bca16e08b827af78bc5961993c788b699b8, scope wasi-gate-scenarios. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: For one completed scenario, same and diff cannot both increment; guest stdout equality with native is insufficient to exclude differing stderr before merge settings.
Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.
reverse_reconstruction
Subject: wasi-host/examples/mlab_gate.rs at SHA-256 a7947069ab507ffd5ad7b71ae9146bca16e08b827af78bc5961993c788b699b8, scope wasi-gate-scenarios. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: A diff string preserves scenario id and debug outputs but not Vfs state, fuel or guest exit. Equal output admits different states and errors excluded by comparison.
Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.
fresh_vfs
Subject: wasi-host/examples/mlab_gate.rs at SHA-256 a7947069ab507ffd5ad7b71ae9146bca16e08b827af78bc5961993c788b699b8, scope wasi-gate-scenarios. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: No scenario shares Vfs; guest real means WASI guest API mapping, not host real filesystem.
Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.
trap_text
Subject: wasi-host/examples/mlab_gate.rs at SHA-256 a7947069ab507ffd5ad7b71ae9146bca16e08b827af78bc5961993c788b699b8, scope wasi-gate-scenarios. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: Trap Some contributes literal <trap: text>; its formatting can affect equality independent of stdout.
Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.
counter_relation
Subject: wasi-host/examples/mlab_gate.rs at SHA-256 a7947069ab507ffd5ad7b71ae9146bca16e08b827af78bc5961993c788b699b8, scope wasi-gate-scenarios. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: total increments once per scenario, same iff n==g; diffs.len=total-same absent panic.
Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.
timing_scope
Subject: wasi-host/examples/mlab_gate.rs at SHA-256 a7947069ab507ffd5ad7b71ae9146bca16e08b827af78bc5961993c788b699b8, scope wasi-gate-scenarios. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: Native duration includes interpreter creation/run/output extraction; guest duration includes host.run only; timing comparison has differing setup scope.
Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.
tests
Checks and limits
Source review and compilation only for this scope; no runtime branch-coverage claim.
Exact names: .
Memory tests bypass linker ABI; tiny empty/unreachable guests exercise engine outcomes only. The CLI test uses isolated import/export/journal fixtures.
Five compiled production/helper-source controls: append offset, virtual clock advance, trap status, CLI export gate and newest-mtime max. Each compiles, fails its selected assertion, restores exact original bytes and passes again. These controls cover their target relations, not every node. No assertion-only mutants. See external source-test-map.json, native-commands.json, verify.rs and numeric/raw receipts in $MOVA_DATA/runs/octopus-wave31-wasi-2026-10-31. The example main and frozen mlab paths are never executed.
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