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# IRIS COQ DEVELOPMENT
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This is the Coq development of the [Iris Project](http://iris-project.org),
which includes the [MoSeL proof mode](http://iris-project.org/mosel/).
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A LaTeX version of the core logic definitions and some derived forms is
available in [docs/iris.tex](docs/iris.tex).  A compiled PDF version of this
document is [available online](http://plv.mpi-sws.org/iris/appendix-3.1.pdf).

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## Building Iris

### Prerequisites
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This version is known to compile with:

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 - Coq 8.7.1 / 8.7.2 / 8.8.0 / 8.8.1
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 - A development version of [std++](https://gitlab.mpi-sws.org/robbertkrebbers/coq-stdpp)
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For a version compatible with Coq 8.6, have a look at the
[iris-3.1 branch](https://gitlab.mpi-sws.org/FP/iris-coq/tree/iris-3.1).
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If you need to work with Coq 8.5, please check out the
[iris-3.0 branch](https://gitlab.mpi-sws.org/FP/iris-coq/tree/iris-3.0).

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### Working *with* Iris
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To use Iris in your own proofs, we recommend you install Iris via opam (1.2.2 or
newer).  To obtain the latest stable release, you have to add the Coq opam
repository:
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    opam repo add coq-released https://coq.inria.fr/opam/released
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To obtain a development version, also add the Iris opam repository:
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    opam repo add iris-dev https://gitlab.mpi-sws.org/FP/opam-dev.git
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Either way, you can now do `opam install coq-iris`.  To fetch updates later, run
`opam update && opam upgrade`.  However, notice that we do not guarnatee
backwards-compatibility, so upgrading Iris may break your Iris-using
developments.

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### Working *on* Iris
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To work on Iris itself, you need to install its build-dependencies.  Again we
recommend you do that with opam (1.2.2 or newer).  This requires the following
two repositories:
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    opam repo add coq-released https://coq.inria.fr/opam/released
    opam repo add iris-dev https://gitlab.mpi-sws.org/FP/opam-dev.git
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Once you got opam set up, run `make build-dep` to install the right versions
of the dependencies.
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Run `make -jN` to build the full development, where `N` is the number of your
CPU cores.
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To update Iris, do `git pull`.  After an update, the development may fail to
compile because of outdated dependencies.  To fix that, please run `opam update`
followed by `make build-dep`.

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## Directory Structure
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* The folder [algebra](theories/algebra) contains the COFE and CMRA
  constructions as well as the solver for recursive domain equations.
* The folder [base_logic](theories/base_logic) defines the Iris base logic and
  the primitive connectives.  It also contains derived constructions that are
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  entirely independent of the choice of resources.
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  * The subfolder [lib](theories/base_logic/lib) contains some generally useful
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    derived constructions.  Most importantly, it defines composeable
    dynamic resources and ownership of them; the other constructions depend
    on this setup.
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* The folder [program_logic](theories/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
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  constructions that work for any such language.
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* The folder [bi](theories/bi) contains the BI++ laws, as well as derived
  connectives, laws and constructions that are applicable for general BIS.
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* The folder [proofmode](theories/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
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  [ProofMode.md](ProofMode.md).
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* The folder [heap_lang](theories/heap_lang) defines the ML-like concurrent heap
  language
  * The subfolder [lib](theories/heap_lang/lib) contains a few derived
    constructions within this language, e.g., parallel composition.
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    For more examples of using Iris and heap_lang, have a look at the
    [Iris Examples](https://gitlab.mpi-sws.org/FP/iris-examples).
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* The folder [tests](theories/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.
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## Case Studies
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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/FP/iris-examples) is where we
  collect miscellaneous case studies that do not have their own repository.
* [LambdaRust](https://gitlab.mpi-sws.org/FP/LambdaRust-coq/) is a Coq
  formalization of the core Rust type system.
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* [iGPS](https://gitlab.mpi-sws.org/FP/sra-gps/tree/gen_proofmode_WIP) is a
  logic for release-acquire memory.
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* [Iris Atomic](https://gitlab.mpi-sws.org/FP/iris-atomic/) is an experimental
  formalization of logically atomic triples in Iris.
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## Notes for Iris Developers

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* Information on how to set up your editor for unicode input and output is
  collected in [Editor.md](Editor.md).
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* The Iris Proof Mode (IPM) / MoSeL is documented at [ProofMode.md](ProofMode.md).
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* Naming conventions are documented at [Naming.md](Naming.md).

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### How to update the std++ dependency
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* Do the change in std++, push it.
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* Wait for CI to publish a new std++ version on the opam archive, then run
  `opam update iris-dev`.
* In Iris, change the `opam` file to depend on the new version.
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* Run `make build-dep` (in Iris) to install the new version of std++.
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  You may have to do `make clean` as Coq will likely complain about .vo file
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  mismatches.
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### How to write/update test cases

The files in `tests/` are test cases.  Each of the `.v` files comes with a
matching `.ref` file containing the expected output of `coqc`.  Adding `Show.`
in selected places in the proofs makes `coqc` print the current goal state.
This is used to make sure the proof mode prints goals and reduces terms the way
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we expect it to.  You can run `MAKE_REF=1 make` to re-generate all the `.ref` files;
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this is useful after adding or removing `Show.` from a test.  If you do this,
make sure to check the diff for any unexpected changes in the output!