framac-22.0-beta.md

layout: default
date: 28-10-2020
short_title: Frama-C 22.0-beta (Titanium)
title: Beta release of Frama-C 22.0-beta (Titanium)
link: /fc-versions/titanium.html

Frama-C 22.0-beta (Titanium) is out. Download it here.

Main changes with respect to Frama-C 21 (Scandium) include:

Kernel:

• OCaml version greater than or equal to 4.08.1 required.
• introduce check-only annotations for requires, ensures, loop invariant and lemmas
• \from now accepts &v expressions
• add option -print-config-json, to output Frama-C configuration data in JSON format
• new option -explain, which provides help messages for options used on the command line
• add option -print-cpp-commands, to print the preprocessing commands used by Frama-C
• support for C11's _Noreturn and _Thread_local specifiers
• allows for axiomatic blocks-like extensions

Aorai:

• Ya automata can set auxiliary variables during a transition, and use such variables in subsequent guards.

E-ACSL:

• support of bitwise operators
• support of \separated
• support of complete and disjoint behaviors
• support of logical array comparisons

Eva:

• easier setup of dynamic allocation builtins: new option -eva-alloc-builtin to configure uniformly their behavior (instead of mapping each malloc/calloc/realloc function to the corresponding builtin), and new annotation eva_allocate to locally override the global option
• new builtins for trigonometric functions acos, asin and atan (and their single-precision version acosf, asinf, atanf)
• improved automatic loop unroll (-eva-auto-loop-unroll option) on loops with several exit conditions, conditions using equality operators, temporary variables introduced by the Frama-C normalization or goto statements

Markdown Report:

• update Sarif output to 2.1.0 and prettier URI

Variadic:

• the generated code is now compilable and compatible with E-ACSL

WP:

• upgraded Why3 backend (requires why3 1.3.3)
• support of the \initialized ACSL predicate
• support for generalized check-only ACSL annotations
• added support for Why3 interactive prover (Coq)
• new tactic Bit-Test range
• memory model hypotheses warnings are more precise
• new experimental option: -wp-check-memory-model to automatically check memory model hypotheses
• new warning pedantic-assigns. WP needs precise assigns ... \from ... specification about out pointers to generate precise proof hypotheses

A complete changelog can be found here.