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Benjamin Peters
Iris
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ea2417ba
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ea2417ba
authored
2 years ago
by
Ralf Jung
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set release date to tomorrow, re-flow changelog
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CHANGELOG.md
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@@ -3,32 +3,30 @@ way the logic is used on paper. We also document changes in the Coq
development; every API-breaking change should be listed, but not every new
lemma.
## Iris 4.0.0 (2022-08-
??
)
## Iris 4.0.0 (2022-08-
18
)
The highlight of
th
is
release
is the
*later credits*
mechanism, which
provides a new
way to eliminate later modalities.
The highlight of
Ir
is
4.0
is the
*later credits*
mechanism, which
provides a new
way to eliminate later modalities.
This new mechanism complements the existing techniques of taking program steps,
exploiting timelessness, and various modality commuting rules.
At each program step, one obtains a credit
`£ 1`
, which is an
ownable Iris resource. These credits don't have to be used at the present step,
but can be saved up, and used to eliminate laters at any point in the
verification using the fancy update modality.
Later credits are particularly
useful in proofs where there is not a one-to-one correspondence between program
steps and later eliminations, for example, logical atomicity proofs.
As a consequence, we have been able to simplify the definition of logical atomicity
by removing the 'laterable' mechanism.
exploiting timelessness, and various modality commuting rules. At each program
step, one obtains a credit
`£ 1`
, which is an ownable Iris resource. These
credits don't have to be used at the present step, but can be saved up, and used
to eliminate laters at any point in the verification using the fancy update
modality. Later credits are particularly useful in proofs where there is not a
one-to-one correspondence between program steps and later eliminations, for
example, logical atomicity proofs. As a consequence, we have been able to
simplify the definition of logical atomicity by removing the 'laterable'
mechanism.
The later credit mechanism is described in detail in the
[
ICFP'22 paper
](
https://plv.mpi-sws.org/later-credits/
)
and there is a
[
ICFP'22 paper
](
https://plv.mpi-sws.org/later-credits/
)
and there is a
[
small tutorial
](
https://gitlab.mpi-sws.org/iris/iris/-/blob/master/tests/later_credits_paper.v
)
in the Iris repository.
The
[
examples
](
https://gitlab.mpi-sws.org/iris/examples/
)
repository contains
some
logically atomic case studies that make use of later credits:
the counter with a
backup (Section 4 of the later credits paper), as well as
the elimination stack,
conditional increment, and RDCSS.
in the Iris repository.
The
[
examples
](
https://gitlab.mpi-sws.org/iris/examples/
)
repository contains
some
logically atomic case studies that make use of later credits:
the counter with a
backup (Section 4 of the later credits paper), as well as
the elimination stack,
conditional increment, and RDCSS.
Iris 4.0 supports Coq 8.13 - 8.16.
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