CHANGELOG.md 2.76 KB
Newer Older
Ralf Jung's avatar
Ralf Jung committed
1 2 3
In this changelog, we document "large-ish" changes to Iris that affect even the
way the logic is used on paper.  We also mention some significant changes in the
Coq development, but not every API-breaking change is listed.  Changes marked
4
`[#]` still need to be ported to the Iris Documentation LaTeX file(s).
5

6
## Iris 3.0 (unfinished)
7

8
* There now is a deprecation process.  The modules `*.deprecated`
9
  contain deprecated notations and definitions that are provided for
10
  backwards compatibility and will be removed in a future version of Iris.
Ralf Jung's avatar
Ralf Jung committed
11
* View shifts are radically simplified to just internalize frame-preserving
12
  updates.  Weakestpre is defined inside the logic, and invariants and view
13 14
  shifts with masks are also coded up inside Iris.  Adequacy of weakestpre
  is proven in the logic.
15
* [#] Use OFEs instead of COFEs everywhere.  COFEs are only used for solving the
16 17
  recursive domain equation.  As a consequence, CMRAs no longer need a proof
  of completeness.
18
  (The old `cofeT` is provided by `algebra.deprecated`.)
19
* Renaming and moving things around: uPred and the rest of the base logic are
20
  in `base_logic`, while `program_logic` is for everything involving the
21
  general Iris notion of a language.
Ralf Jung's avatar
Ralf Jung committed
22 23 24
* Changed notation for embedding Coq assertions into Iris.  The new notation
  is ⌜φ⌝.  Also removed `=` and `⊥` from the Iris scope.
  (The old notations are provided in `base_logic.deprecated`.)
25
* Up-closure of namespaces is now a notation (↑) instead of a coercion.
Ralf Jung's avatar
Ralf Jung committed
26
* With invariants and the physical state being handled in the logic, there
27
  is no longer any reason to demand the CMRA unit to be discrete.
Ralf Jung's avatar
Ralf Jung committed
28
* The language can now fork off multiple threads at once.
Ralf Jung's avatar
Ralf Jung committed
29
* Local Updates (for the authoritative monoid) are now a 4-way relation
30
  with syntax-directed lemmas proving them.
Ralf Jung's avatar
Ralf Jung committed
31 32 33

## Iris 2.0

Ralf Jung's avatar
Ralf Jung committed
34 35 36 37
* [heap_lang] No longer use dependent types for expressions.  Instead, values
  carry a proof of closedness.  Substitution, closedness and value-ness proofs
  are performed by computation after reflecting into a term langauge that knows
  about values and closed expressions.
38 39
* [program_logic/language] The language does not define its own "atomic"
  predicate.  Instead, atomicity is defined as reducing in one step to a value.
40 41 42 43 44 45 46 47
* [program_logic] Due to a lack of maintenance and usefulness, lifting lemmas
  for Hoare triples are removed.

## Iris 2.0-rc2

This version matches the final ICFP paper.

* [algebra] Make the core of an RA or CMRA a partial function.
Ralf Jung's avatar
Ralf Jung committed
48
* [program_logic/lifting] Lifting lemmas no longer round-trip through a
Ralf Jung's avatar
Ralf Jung committed
49 50 51
  user-chosen predicate to define the configurations we can reduce to; they
  directly relate to the operational semantics.  This is equivalent and
  much simpler to read.
Ralf Jung's avatar
Ralf Jung committed
52 53 54 55

## Iris 2.0-rc1

This is the Coq development and Iris Documentation as submitted to ICFP.