CHANGELOG.md

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 [#] still need to be ported to the Iris Documentation LaTeX file(s).

Iris 3.0~rc1

This version matches the ESOP submission.

• View shifts are radically simplified to just internalize frame-preserving updates. Weakestpre is defined inside the logic, and invariants and view shifts with masks are also coded up inside Iris. Adequacy of weakestpre is proven in the logic.
• With invariants and the physical state being handled in the logic, there is no longer any reason to demand the CMRA unit to be discrete.
• The language can now fork off multiple threads at once.
• Local Updates (for the authoritative monoid) are now a 4-way relation with syntax-directed lemmas proving them.

Iris 2.0

• [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.
• [program_logic/language] The language does not define its own "atomic" predicate. Instead, atomicity is defined as reducing in one step to a value.
• [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.
• [program_logic/lifting] Lifting lemmas no longer round-trip through a 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.

Iris 2.0-rc1

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