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# IRIS COQ DEVELOPMENT [[coqdoc]](https://plv.mpi-sws.org/coqdoc/iris/)
This is the Coq development of the [Iris Project](http://iris-project.org),
which includes [MoSeL](http://iris-project.org/mosel/), a general proof mode
for carrying out separation logic proofs in Coq.
For using the Coq library, check out the
[API documentation](https://plv.mpi-sws.org/coqdoc/iris/).
For understanding the theory of Iris, a LaTeX version of the core logic
definitions and some derived forms is available in
[tex/iris.tex](tex/iris.tex). A compiled PDF version of this document is
[available online](http://plv.mpi-sws.org/iris/appendix-3.2.pdf).
## Side-effects
Importing Iris has some side effects as the library sets some global options.
* First of all, Iris imports std++, so the
[std++ side-effects](https://gitlab.mpi-sws.org/iris/stdpp/#side-effects)
apply.
* On top of that, Iris imports ssreflect, which replaces the default `rewrite`
tactic with the ssreflect version. However, `done` is overwritten to keep
using the std++ version of the tactic. We also set `SsrOldRewriteGoalsOrder`
and re-open `general_if_scope` to un-do some effects of ssreflect.
- A development version of [std++](https://gitlab.mpi-sws.org/iris/stdpp)
If you need to work with Coq 8.7 or Coq 8.8, please check out the
[iris-3.2 branch](https://gitlab.mpi-sws.org/iris/iris/tree/iris-3.2).
For Coq 8.9, you can use the
[iris-3.3 branch](https://gitlab.mpi-sws.org/iris/iris/tree/iris-3.3).
To use Iris in your own proofs, we recommend you install Iris via opam (2.0.0 or
newer). To obtain the latest stable release, you have to add the Coq opam
repository:
opam repo add coq-released https://coq.inria.fr/opam/released
To obtain a development version, also add the Iris opam repository:
opam repo add iris-dev https://gitlab.mpi-sws.org/iris/opam.git
Either way, you can now install Iris:
- `opam install coq-iris` will install the libraries making up the Iris logic,
but leave it up to you to instantiate the `program_logic.language` interface
to define a programming language for Iris to reason about.
- `opam install coq-iris-heap-lang` will additionally install HeapLang, the
default language used by various Iris projects.
To fetch updates later, run `opam update && opam upgrade`. However, notice that
we do not guarantee backwards-compatibility, so upgrading Iris may break your
Iris-using developments. If you want to be notified of breaking changes, please
let us know your account name on the
[MPI-SWS GitLab](https://gitlab.mpi-sws.org/) so we can add you to the
See the [contribution guide](CONTRIBUTING.md) for information on how to work on
the Iris development itself.
* The folder [prelude](iris/prelude) contains modules imported everywhere in
Iris.
* The folder [algebra](iris/algebra) contains the COFE and CMRA
constructions as well as the solver for recursive domain equations.
* The folder [base_logic](iris/base_logic) defines the Iris base logic and
the primitive connectives. It also contains derived constructions that are
entirely independent of the choice of resources.
* The subfolder [lib](iris/base_logic/lib) contains some generally useful
derived constructions. Most importantly, it defines composable
dynamic resources and ownership of them; the other constructions depend
on this setup.
* The folder [program_logic](iris/program_logic) specializes the base logic
to build Iris, the program logic. This includes weakest preconditions that
are defined for any language satisfying some generic axioms, and some derived
constructions that work for any such language.
* The folder [bi](iris/bi) contains the BI++ laws, as well as derived
connectives, laws and constructions that are applicable for general BIS.
* The folder [proofmode](iris/proofmode) contains
[MoSeL](http://iris-project.org/mosel/), which extends Coq with contexts for
intuitionistic and spatial BI++ assertions. It also contains tactics for
interactive proofs. Documentation can be found in
* The folder [heap_lang](iris_heap_lang) defines the ML-like concurrent heap
* The subfolder [lib](iris_heap_lang/lib) contains a few derived
constructions within this language, e.g., parallel composition.
For more examples of using Iris and heap_lang, have a look at the
* The folder [tests](tests) contains modules we use to test our
infrastructure. Users of the Iris Coq library should *not* depend on these
modules; they may change or disappear without any notice.
* The folder [si_logic](iris/si_logic) defines a "plain" step-indexed logic
and shows that it is an instance of the BI interface.
The following is a (probably incomplete) list of case studies that use Iris, and
that should be compatible with this version:
* [Iris Examples](https://gitlab.mpi-sws.org/iris/examples) is where we
collect miscellaneous case studies that do not have their own repository.
* [LambdaRust](https://gitlab.mpi-sws.org/iris/lambda-rust) is a Coq
* [GPFSL](https://gitlab.mpi-sws.org/iris/gpfsl) is a logic for release-acquire
and relaxed memory.
* [Iron](https://gitlab.mpi-sws.org/iris/iron) is a linear separation logic
built on top of Iris for precise reasoning about resources (such as making
* [Actris](https://gitlab.mpi-sws.org/iris/actris) is a separation logic
built on top of Iris for session-type based reasoning of message-passing
programs.
Ralf Jung
committed
Getting along with Iris in Coq:
* Iris proof patterns and conventions are documented in the
[proof guide](docs/proof_guide.md).
* Various notions of equality and logical entailment in Iris and their Coq
interface are described in the
[equality docs](docs/equalities_and_entailments.md).
* The Iris tactics are described in the
[the Iris Proof Mode (IPM) / MoSeL documentation](docs/proof_mode.md) as well as the
[HeapLang documentation](docs/heap_lang.md).
* The generated coqdoc is [available online](https://plv.mpi-sws.org/coqdoc/iris/).
Contacting the developers:
* Discussion about the Iris Coq development happens on the mailing list
[iris-club@lists.mpi-sws.org](https://lists.mpi-sws.org/listinfo/iris-club)
and in the [Iris Chat](https://mattermost.mpi-sws.org/iris). This is also the
right place to ask questions. The chat requires an account at the
[MPI-SWS GitLab](https://gitlab.mpi-sws.org/users/sign_in) (use the "Register"
tab). If you have trouble joining the chat, please contact
[Ralf](https://gitlab.mpi-sws.org/jung).
[issue tracker](https://gitlab.mpi-sws.org/iris/iris/issues), which also
requires an MPI-SWS GitLab account.
* To contribute to Iris itself, see the [contribution guide](CONTRIBUTING.md).
Miscellaneous:
* Information on how to set up your editor for unicode input and output is
* If you are writing a paper that uses Iris in one way or another, you could use
the [Iris LaTeX macros](tex/iris.sty) for typesetting the various Iris