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Feat: Interval proofs from guards and locals drop provably safe integer checks (#148) #218

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b-re-w merged 3 commits into from
Oct 17, 2026
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Feat: Interval proofs from guards and locals drop provably safe integer checks (#148) #218

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d69f1a9
Feat: Interval proofs from guards and locals drop provably safe integ…
b-re-w Oct 17, 2026
de73628
Test: The sanitizer run checks every proven op (TP_CHECK_PROVEN); SPE…
b-re-w Oct 17, 2026
8011a60
Bench: Record the interval-proofs A/B (#148)
b-re-w Oct 17, 2026
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2 changes: 1 addition & 1 deletion .github/workflows/typedpython.yml
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Expand Up @@ -78,7 +78,7 @@ jobs:
run: |
env $(.venv/bin/python tools/sanitizers.py env) \
.venv/bin/python -m pytest -q -m "not measurement and not race_mutant" \
src/test/python/test_cgen.py src/test/python/test_runtime.py src/test/python/test_pipeline.py
src/test/python/test_cgen.py src/test/python/test_runtime.py src/test/python/test_pipeline.py src/test/python/test_interval_proofs.py

app-fixture:
# #45: a TypedPython-compiled module calling Kotlin through the upcall table, in the app
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308 changes: 308 additions & 0 deletions benchmarks/typedpython/results/2026-10-17-interval-proofs-ab.json
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1 change: 1 addition & 0 deletions docs/SPEC.md
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Expand Up @@ -577,6 +577,7 @@ All in `PM/commonTest`, so they run wherever the interpreter loads.
| No deopting node in an impure function | not compiled; diagnostic |
| Array access in bounds, or a runtime bounds check kept | the check stays (never an unchecked access) |
| Array parameters only indexed, stored, `len`-ed; no aliasing (entry guard) | not compiled; diagnostic |
| Integer ops proven safe by the verifier's intervals (constants, `len`, `range` variables, guards such as `if x < e` / `while lo < hi`, joined local assignments, `//` and `%` by constants) | emitted unchecked (a shift/mask for `//`/`%` by a power of two of a non-negative value); the sanitizer CI run builds with `TP_CHECK_PROVEN` and turns a wrong proof into a SystemError (#148) |
| A function holding an array parameter runs no user code: closed, and no slot read or `C(args)` whose slow path runs user code, in its whole call tree (#203) | not compiled; diagnostic |
| OBJ references follow one ownership rule; no IR form for free, borrowed alias or NULL read | not compiled; diagnostic |
| Integer overflow checked and promoted (deopt); an op marked `proven` must re-prove its interval fits i64 | not compiled; diagnostic `verify/proven-overflow` |
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