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Rodolphe Lepigre
Iris
Commits
ca3c807e
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ca3c807e
authored
Dec 05, 2017
by
Ralf Jung
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changelog nits
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0523bbf3
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CHANGELOG.md
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ca3c807e
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@@ -13,15 +13,14 @@ Changes in and extensions of the theory:
*
Constructions for least and greatest fixed points over monotone predicates
(defined in the logic of Iris using impredicative quantification).
*
Add a proof of the inverse of
`wp_bind`
.
*
Support verifying code that might get stuck by distinguishing
"non-stuck" vs. "(potentially) stuck" weakest preconditions. (See
[Swasey et al. OOPSLA '17] for examples.) The non-stuck
`WP e @ E {{
Φ }}`
ensures that, as
`e`
runs, it does not get stuck. The stuck
`WP e @ E ?{{ Φ }}`
ensures that, as usual, all invariants are
preserved while
`e`
runs, but it permits execution to get stuck. The
former implies the latter. The full judgment is
`WP e @ s; E {{ Φ
}}`
, where non-stuck WP uses
*stuckness bit*
`s = not_stuck`
while
stuck WP uses
`s = maybe_stuck`
.
*
Support verifying code that might get stuck by distinguishing "non-stuck"
vs. "(potentially) stuck" weakest preconditions. (See
[Swasey et al., OOPSLA '17] for examples.) The non-stuck
`WP e @ E {{ Φ }}`
ensures that, as
`e`
runs, it does not get stuck. The stuck
`WP e @ E ?{{ Φ
}}`
ensures that, as usual, all invariants are preserved while
`e`
runs, but
it permits execution to get stuck. The former implies the latter. The full
judgment is
`WP e @ s; E {{ Φ }}`
, where non-stuck WP uses
*stuckness bit*
`s
= not_stuck`
while stuck WP uses
`s = maybe_stuck`
.
Changes in Coq:
...
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