We are thrilled to announce Dezyne 2.14: Dezyne is now being released as free software (FLOSS); thank you verum.com! Of course, Verum will continue to sponsor development of Dezyne, as well as offer the commercial Dezyne-IDE integration.

This release introduces implicit interface illegals: Specifying illegal in an interface is now optional, similar to components.

Dezyne now also has implicit temporary variables: a single valued action or call can now be used in if and reply expressions.

A new command dzn graph can be used to generate simplified (filtered) state diagrams using --hide and --remove options.

In the verification and simulation traces, the beginning of a livelock error is now marked with <loop>.

The documentation has seen a major rewrite and is available here: https://dezyne.org/documentation.html.

We will evaluate your reports and track them via the Gitlab dezyne-issues project, see our guide to writing helpful bug reports.

What's next?

Full blocking support and verification with system scope. Introducing a new keyword defer for asynchronous behavior and deprecation of async.

Future

Looking beyond the next releases we will introduce implicit interface constraints. Hierarchical behaviors, module-specifications and data-interfaces. Support for Model Based Testing.

Enjoy!
The Dezyne developers.

Here are the compressed sources and a GPG detached signature[*]:
dezyne-2.14.0.tar.gz
dezyne-2.14.0.tar.gz.sig

Here are the MD5 and SHA1 checksums:
05ec3d262ff142e957a0b2d1eafed1d4 dezyne-2.14.0.tar.gz
56de95b39815e1605f0789661d97bf22f288796a dezyne-2.14.0.tar.gz

[*] Use a .sig file to verify that the corresponding file (without the .sig suffix) is intact. First, be sure to download both the .sig file and the corresponding tarball. Then, run a command like this:

gpg --verify dezyne-2.14.0.tar.gz.sig

If that command fails because you don't have the required public key, then run this command to import it:

gpg --keyserver keys.gnupg.net --recv-keys 1A858392E331EAFDB8C27FFBF3C1A0D9C1D65273

and rerun the gpg --verify command.

NEWS

Changes in 2.14.0 since 2.13.3

• Release

  • Dezyne is now released as free software, under the terms of the GNU Affero General Public Licence, version 3 or later (AGPL3+). The Dezyne runtime is released under the GNU Lesser General Public License, version 3 or later (LGPL3+).
  • Dezyne now mostly conforms to the reuse 3.0 specification (except where it conflicts with the GNU standard names of license files).

• Language

  • The need for temporary variables has been removed for the most common cases; the expression of the if and reply statement now allows the use of a single valued action or function call. The && and the || operators allow them as their left-hand operand only (#26).
  • The need for explicit illegals in interfaces has been removed.
  • The behaviour keyword has been deprecated and is renamed to behavior, as software commonly uses US English.

• Parser

  • The well-formedness check now reports incorrect usage of blocking out-bindings.
  • The well-formedness check now uses info for any informational messages that follow an error.
  • Using a formal binging (<-) with non-data member variable is now reported as an error.
  • Well-formedness errors are made more consistent.

• Verification

  • The interface completeness check has been removed; just like components, unspecified events in an interface behavior are now marked implicitly illegal.
  • The beginning of a livelock loop is now marked in the trace with "<loop>" (#44).
  • The dependency on the m4-cw tool has been removed from the verification pipeline.

• Simulation

  • The beginning of a livelock loop is now marked in the trace with "<loop>" (#44).
  • In case of a non-compliance error related to mixing inevitable and optional the simulator now reports which events are expected to be inevitable and which are optional in the interface (#61).

• Code

  • In the generated C++, the initialization of the meta object in the member initialization list of a component or system uses the address of the meta objects of its ports. An instance of the Clang compiler reports a false positive when using the -Wuninitialized option. Although the ports have not been initialized at this point the address of a member is valid and can be safely captured. This is now side stepped by deferring the initalization of this field to the body of the constructor.

• Views

  • A new command dzn graph can be used to generate graphs using different backends: "dependency", "lts", "state", and "system". The "state" backend now supports hiding of unwanted detail. The new options -R,--remove=... and -H,--hide=... can be used to filter-out port state or extended state from the nodes, action transition labels or even all transition labels (#29).
  • The dzn explore command has been deprecated and users are requested to use dzn graph instead. dzn explore is planned to be removed in the next release.

• Documentation

  • The Dezyne Reference Manual has been largely rewritten and the outdated Dezyne Tutorial has been removed.
  • The "Well-formedness" chapter has been updated to use the well-formed errors that are actually generated.

• Noteworthy bug fixes

  • The use of an undefined variable now produces a parse error. This regression was introduced in 2.13.3.

  • The use of an interface enum as event now produces a parse error.

  • The simulator now also reports a Y-fork: forking a requires-out event to more than one provides ports.

  • The simulator no longer reports false positives for the interface unobservably non-deterministic check.

  • The simulator no longer lists events on a blocked port as eligible.

  • The simulator no longer reports false potitives for the compliance check in the case of a blocking trace with a stateful provides port.

  • A quadratic performance problem when parsing pre-processed dezyne input has been fixed.

  • The parser now avoids repeating stat calls, improving the performance of parsing large projects on Windows.

About Dezyne

Dezyne is a programming language and a set of tools to specify, validate, verify, simulate, document, and implement concurrent control software for embedded and cyber-physical systems.

The Dezyne language has formal semantics expressed in mCRL2 developed at the department of Mathematics and Computer Science of the Eindhoven University of Technology (TUE). Dezyne requires that every model is finite, deterministic and free of deadlocks, livelocks, and contract violations. This is achieved by means of the language itself as well as builtin verification through model checking. This allows the construction of complex systems by assembling independently verified components.

Dezyne is free software, it is distributed under the terms of the GNU Affero General Public Licence version 3 or later.

About Verum

Verum, the organization behind the Dezyne language, is committed to continuing to invest in the language for the benefit of all its users. Verum assists its customers and partners in solving the software challenges of today and tomorrow, by offering expert consultancy on the application of the Dezyne language and the development and use of its tools, as well as on Verum's commercial tools like IDE support based on the LSP (Language Server Protocol), interactive integrated graphics, interactive simulation, (custom) code generation and (custom) runtime library support.