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Iris
Iris
Commits
7ec456a8
Commit
7ec456a8
authored
Jun 06, 2019
by
Ralf Jung
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move heap_lang changes to their own section
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cf16995f
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#17247
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CHANGELOG.md
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7ec456a8
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@@ -5,15 +5,12 @@ Coq development, but not every API-breaking change is listed. Changes marked
## Iris master
Changes in
and extensions of the theory
:
Changes in
the theory of Iris itself
:
*
Change in the definition of WP, so that there is a fancy update between
the quantification over the next states and the later modality. This makes it
possible to prove more powerful lifting lemmas: The new versions feature an
"update that takes a step".
*
Weaken the semantics of CAS in heap_lang to be efficiently implementable:
CAS may only be used to compare "unboxed" values that can be represented in a
single machine word.
*
Add weakest preconditions for total program correctness.
*
"(Potentially) stuck" weakest preconditions and the "plainly modality" are no
longer considered experimental.
...
...
@@ -22,13 +19,26 @@ Changes in and extensions of the theory:
*
Add the notion of an "observation" to the language interface, so that
every reduction step can optionally be marked with an event, and an execution
trace has a matching list of events. Change WP so that it is told the entire
future trace of observations from the beginning. Use this in heap_lang to
implement prophecy variables.
future trace of observations from the beginning.
*
The Löb rule is now a derived rule; it follows from later-intro, later
being contractive and the fact that we can take fixpoints of contractive
functions.
*
Add atomic updates and logically atomic triples, including tactic support.
See
`heap_lang/lib/increment.v`
for an example.
*
Extend the state interpretation with a natural number that keeps track of
the number of forked-off threads, and have a global fixed proposition that
describes the postcondition of each forked-off thread (instead of it being
`True`
). Additionally, there is a stronger variant of the adequacy theorem
that allows to make use of the postconditions of the forked-off threads.
*
The user-chosen functor used to instantiate the Iris logic now goes from
COFEs to Cameras (it was OFEs to Cameras).
Changes in heap_lang:
*
Weaken the semantics of CAS in heap_lang to be efficiently implementable:
CAS may only be used to compare "unboxed" values that can be represented in a
single machine word.
*
Implement prophecy variables using the new support for "observations".
*
heap_lang now uses right-to-left evaluation order. This makes it
significantly easier to write specifications of curried functions.
*
heap_lang values are now injected in heap_lang expressions via a specific
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@@ -37,13 +47,8 @@ Changes in and extensions of the theory:
the reflection mechanism that was needed for proving closedness, atomicity and
"valueness" of a term. The price to pay is the addition of new
"administrative" reductions in the operational semantics of the language.
*
Extend the state interpretation with a natural number that keeps track of
the number of forked-off threads, and have a global fixed proposition that
describes the postcondition of each forked-off thread (instead of it being
`True`
). Additionally, there is a stronger variant of the adequacy theorem
that allows to make use of the postconditions of the forked-off threads.
*
The user-chosen functor used to instantiate the Iris logic now goes from
COFEs to Cameras (it was OFEs to Cameras).
*
heap_lang now has support for allocating, accessing and reasoning about arrays
(continuously allocated regions of memory).
Changes in Coq:
...
...
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