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From: Alan Schmitt <alan.schmitt@polytechnique.org>
To: "lwn" <lwn@lwn.net>, "cwn"  <cwn@lists.idyll.org>, caml-list@inria.fr
Subject: [Caml-list] Attn: Development Editor, Latest OCaml Weekly News
Date: Tue, 11 May 2021 16:47:52 +0200
Message-ID: <871rad499j.fsf@m4x.org> (raw)

[-- Attachment #1: Type: text/plain, Size: 27361 bytes --]

Hello

Here is the latest OCaml Weekly News, for the week of May 04 to 11,
2021.

Table of Contents
─────────────────

Software engineer position at LexiFi (Paris)
Open source editor for iOS, iPadOS and macOS
Backend developer position at Issuu (Copenhagen)
25 years of OCaml
OCaml compiler development newsletter, issue 1: before May 2021
After so many years, I discover 'Str.bounded_full_split regexp str n'
Parser for the Scala programming language?
Old CWN


Software engineer position at LexiFi (Paris)
════════════════════════════════════════════

  Archive:
  <https://discuss.ocaml.org/t/job-software-engineer-position-at-lexifi-paris/7782/1>


Alain Frisch announced
──────────────────────

  [LexiFi] is hiring! We are looking for a fully-time software engineer
  to join our core development team. The vast majority of our stack is
  implemented in OCaml, and we have plenty of exciting projects on a
  wide range of topics.

  More info on <https://www.lexifi.com/careers/software_engineer/>


[LexiFi] <https://www.lexifi.com>


Open source editor for iOS, iPadOS and macOS
════════════════════════════════════════════

  Archive:
  <https://discuss.ocaml.org/t/open-source-editor-for-ios-ipados-and-macos/7624/15>


Continuing this thread, Nathan Fallet announced
───────────────────────────────────────────────

  Just updated the editor, I redesigned the macOS version, and it just
  looks better and more native

  <https://aws1.discourse-cdn.com/standard11/uploads/ocaml/optimized/2X/6/6b03c462755fb37a2d5018013c3d1c8bd45f53bf_2_1380x766.jpeg>

  What are your first impressions on it?


Backend developer position at Issuu (Copenhagen)
════════════════════════════════════════════════

  Archive:
  <https://discuss.ocaml.org/t/job-backend-developer-position-at-issuu-copenhagen/7793/1>


Dario Teixeira announced
────────────────────────

  We are looking for a Backend Developer with experience in machine
  learning – and preferably also OCaml! – to join our Research &
  Development team. You will help build machine learning research
  prototypes and be responsible for integrating them into new and
  existing products.

  At Issuu, we use OCaml extensively in our production systems. If you
  love OCaml and functional programming in general, Issuu is a great
  place to put your passion into real-world products!

  Please find more information about this position at the following
  link:
  <https://jobs.lever.co/issuu/f502cb20-b216-4c67-8357-d748e1b35178>


Anentropic asked and Dario Teixeira replied
───────────────────────────────────────────

        I would love to hear more about your OCaml backend stack

  Well, we love to talk about our OCaml stack! :slightly_smiling_face:

  We rely on the Jane Street ecosystem a lot, using Core as a Stdlib
  replacement and Async for monadic concurrency.

  AMQP forms the backbone of our messaging system, and therefore we use
  [amqp-client] extensively.

  We use both MySQL and Postgresql databases in production. For the
  former we use [ppx_mysql], and for the latter, [PGOCaml]. (Thanks to
  Docker, we can give PGOCaml compile-time access to the DB without
  having to depend on the actual production DB.)

  We currently use Protobuf for serialisation, but spend a great amount
  of time complaining about it. We rely on [ocaml-protoc-plugin] to
  generate the OCaml code from Protobuf definitions.

  Anyway, that's just the basics of our stack. Do let me know if there's
  something else you'd like to know in more detail!


[amqp-client] <https://github.com/andersfugmann/amqp-client>

[ppx_mysql] <https://github.com/issuu/ppx_mysql>

[PGOCaml] <https://github.com/darioteixeira/pgocaml>

[ocaml-protoc-plugin] <https://github.com/issuu/ocaml-protoc-plugin>


roddy asked and Dario Teixeira replied
──────────────────────────────────────

        Do you use Protobuf for interop with non-OCaml systems? If
        not, I'm curious about whether you've considered
        [bin_prot] as an alternative; it seems like an obvious
        choice if you're using Core/Async.

  Yes, we use Protobuf mainly because we have a heterogeneous stack,
  where besides OCaml we also have services running Python, Kotlin, or
  Elixir.


[bin_prot]
<https://github.com/janestreet/bin_prot/blob/master/README.md>


Tim McGilchrist asked and Dario Teixeira
────────────────────────────────────────

        I'm curious about how you structure the business code (for
        want of a better word), in between the technical layers of
        talking to AMQP or an SQL store. Are there larger scale
        patterns like CQRS or DDD that you use to organise code?

  How do you package up code for deployment? Docker / AWS something.
  We're slowly migrating to a micro-service architecture (the pros and
  cons of which are outside the scope of this thread; that's a can of
  worms I'd rather not open…) whose cast of characters includes
  "entities" (responsible for storing/retrieving data from DBs), generic
  backend services that encapsulate business logic, frontend services,
  and backend-for-frontend services.

  We're using Docker for deployment on AWS (mostly), and slowly
  migrating from Docker Swarm to Kubernetes.


25 years of OCaml
═════════════════

  Archive: <https://discuss.ocaml.org/t/25-years-of-ocaml/7813/1>


Xavier Leroy announced
──────────────────────

  25 years ago, on May 9th 1996, release 1.00 of the Objective Caml
  language and system was announced:
  <https://sympa.inria.fr/sympa/arc/caml-list/1996-05/msg00003.html>

  It was already the consolidation of many years of work, integrating
  Jérôme Vouillon and Didier Rémy's work on objects and classes within
  Caml Special Light, itself a combination of my work on modules and
  native-code compilation with earlier code taken from Caml Light,
  especially Damien Doligez's GC.

  Little did I know that O(bjective) Caml would still be there 25 years
  later!

  A lot happened during this time, including several major evolutions of
  the language, and, much more importantly, the emergence of a community
  of users and an ecosystem of tools and libraries.  But maybe this was
  just the beginning for something even bigger?  We'll see…

  Happy birthday, OCaml!


David Allsopp replied
─────────────────────

  Most pleasingly, with a [very small number of patches], the Windows
  port still works in Visual Studio 2019:

  ┌────
  │ C:\Birthday>ocaml.exe
  │ 	Objective Caml version 1.00
  │ 
  │ #print_endline "Happy 25th Birthday, OCaml!";;
  │ Happy 25th Birthday, OCaml!
  │ - : unit = ()
  │ ##quit;;
  │ 
  │ C:\Birthday>type hooray.ml
  │ let rec hip_hip n =
  │   if n > 0 then
  │     let () = print_endline "hip hip! hooray!" in
  │     hip_hip (pred n)
  │ 
  │ let () = hip_hip 25
  │ C:\Birthday>ocamlopt -o hooray.exe hooray.ml
  │ 
  │ C:\Birthday>hooray
  │ hip hip! hooray!
  │ ...
  └────


[very small number of patches]
<https://github.com/dra27/ocaml/commits/25-years-of-ocaml>


On the OCaml Maling List, Roberto Di Cosmo also replied
───────────────────────────────────────────────────────

  Long live OCaml!

  Thanks Xavier, and to all the brilliant minds that contributed to the
  evolution and adoption of this beautiful language, and system, in this
  past quarter of a century.

  If I may add a personal note, one truly remarkable fact is that some
  rather complex code written in 1998 using OCaml 1.07 [1] could be
  compiled and run last year using OCaml 4.x *without modifications*:
  the only visible changes were the new warnings spotting potential
  issues in the code, thanks to the many improvements to the compiler
  over time.

  For the curious, all the details are here:
  <https://www.dicosmo.org/Articles/2020-ReScienceC.pdf>

  Cheers

  Roberto

  [1] that was the first version including support for marshalling
  closures, added in a fantastic one week-spring in Pisa exactly for
  this code :-)


OCaml compiler development newsletter, issue 1: before May 2021
═══════════════════════════════════════════════════════════════

  Archive:
  <https://discuss.ocaml.org/t/ocaml-compiler-development-newsletter-issue-1-before-may-2021/7831/1>


gasche announced
────────────────

  I'm happy to introduce the first issue of the "OCaml compiler
  development newsletter". I asked frequent contributors to the OCaml
  compiler codebase to write a small burb on what they have been doing
  recently, in the interest of sharing more information on what people
  are interested in, looking at and working on.

  This is by no means exhaustive: many people didn't end up having the
  time to write something, and it's fine. But hopefully this can give a
  small window on development activity related to the OCaml compiler,
  structured differently from the endless stream of [Pull Requests] on
  the compiler codebase.

  (This initiative is inspired by the excellent Multicore
  newsletter. Please don't expect that it will be as polished or
  consistent :yo-yo: .)

  Note:

  • Feel free of course to comment or ask questions, but I don't know if
    the people who wrote a small blurb will be looking at the thread, so
    no promises.

  • If you have been working on the OCaml compiler and want to say
    something, please feel free to post! If you would like me to get in
    touch next time I prepare a newsletter issue (some random point in
    the future), please let me know by email at (gabriel.scherer at
    gmail).


[Pull Requests] <https://github.com/ocaml/ocaml/pulls>

@dra27 (David Allsopp)
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  Compiler relocation patches now exist. There's still a few left to
  write, and they need splitting into reviewable PRs, but the core
  features are working. A compiler installation can be copied to a new
  location and still work, meaning that local switches in opam may in
  theory be renamed and, more importantly, we can cache previously-built
  compilers in an opam root to allow a new switch's compiler to be a
  copy. This probably won't be reviewed in time for 4.13, although it's
  intended that once merged opam-repository will carry back-ports to
  earlier compilers.

  A whole slew of scripting pain has lead to some possible patches to
  reduce the use of scripts in the compiler build to somewhat closer to
  none.

  FlexDLL bootstrap has been completely overhauled, reducing build time
  considerably. This will be in 4.13 (#[10135])


[10135] <https://github.com/ocaml/ocaml/pull/10135>


@nojb (Nicolás Ojeda Bär)
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  I am working on #[10159], which enables debug information in
  `-output-complete-exe' binaries. It uses [incbin] under Unix-like
  system and some other method under Windows.


[10159] <https://github.com/ocaml/ocaml/pull/10159>

[incbin] <https://github.com/graphitemaster/incbin>


@gasche (Gabriel Scherer)
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  I worked on bringing more PRs to a decision (merge or close). The
  number of open PRs has gone from 220-ish to 180, which feels nice.

  I have also contributed to @Ekdohibs' project [camlboot], which is a
  "bootstrap-free" implementation of OCaml able to compile the OCaml
  compiler itself. It currently targets OCaml 4.07 for various
  reasons. We were able to do a full build of the OCaml compiler, and
  check that the result produces bootstrap binaries that coincide with
  upstream bootstraps. This gives extremely strong confidence that the
  OCaml bootstrap is free from "trusting trust" attacks. For more
  details, see our [draft paper].


[camlboot] <https://github.com/Ekdohibs/camlboot>

[draft paper] <http://gallium.inria.fr/~scherer/drafts/camlboot.pdf>

with @Octachron (Florian Angeletti)
┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄

  I worked with Florian Angeletti on deprecating certain command-line
  warning-specifier sequences, to avoid usability issues with (new in
  4.12) warning names. Before `-w -partial-match' disables warning 4,
  but `-w -partial' is interpreted as the sequence `w -p -w a -w r -w t
  -w i -w a -w l', most of which are ignored but `-w a' silences all
  warnings. Now multi-letter sequences of "unsigned" specifiers (`-p' is
  signed, `a' is unsigned) are deprecated. (We first deprecated all
  unsigned specifiers, but Leo White tested the result and remarked that
  `-w A' is common, so now we only warn on multi-letter sequences of
  unsigned specifiers.

  I am working with @Octachron (Florian Angeletti) on grouping signature
  items when traversing module signatures. Some items are "ghost items"
  that are morally attached in a "main item"; the code mostly ignores
  this and this creates various bugs in corner cases. This is work that
  Florian started in September 2019 with #[8929], to fix a bug in the
  reprinting of signatures. I only started reviewing in May-September
  2020 and we decided to do sizeable changes, he split it in several
  smaller changes in January 2021 and we merged it in April 2021. Now we
  are looking are fixing other bugs with his code (#[9774],
  #[10385]). Just this week Florian landed a nice PR fixing several
  distinct issues related to signature item grouping: #[10401].


[8929] <https://github.com/ocaml/ocaml/pull/8929>

[9774] <https://github.com/ocaml/ocaml/pull/9774>

[10385] <https://github.com/ocaml/ocaml/pull/10385>

[10401] <https://github.com/ocaml/ocaml/pull/10401>


@xavierleroy (Xavier Leroy)
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  I fixed #[10339], a mysterious crash on the new Macs with "Apple
  silicon".  This was due to a ARM (32 and 64 bits)-specific
  optimization of array bound checking, which was not taken into account
  by the platform-independent parts of the back-end, leading to
  incorrect liveness analysis and wrong register allocation.  #[10354]
  fixes this by informing the platform-independent parts of the back-end
  that some platform-specific instructions can raise.  In passing, it
  refactors similar code that was duplicating platform-independent
  calculations (of which instructions are pure) in platform-dependent
  files.

  I spent quality time with the Jenkins continuous integration system at
  Inria, integrating a new Mac Mini M1.  For unknown reasons, Jenkins
  ran the CI script in x86-64 emulation mode, so we were building and
  testing an x86-64 version of OCaml instead of the intended ARM64
  version.  A bit of scripting later (8b1bc01c3) and voilà, arm64-macos
  is properly tested as part of our CI.

  Currently, I'm reading the "safe points" proposal by Sadiq Jaffer
  (#[10039]) and the changes on top of this proposed by Damien Doligez.
  It's a necessary step towards Multicore OCaml, so we really need to
  move forward on this one.  It's a nontrivial change involving a new
  static analysis and a number of tweaks in every code emitter, but
  things are starting to look good here.


[10339] <https://github.com/ocaml/ocaml/pull/10339>

[10354] <https://github.com/ocaml/ocaml/pull/10354>

[10039] <https://github.com/ocaml/ocaml/pull/10039>


@mshinwell (Mark Shinwell)
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  I did a first pass of review on the safe points PR (#[10039]) and
  significantly simplified the proposed backend changes.  I've also been
  involved in discussions about a new function-level attribute to cause
  an error if safe points (including allocations) might exist within a
  function's body, to make code that currently assumes this robust.
  There will be a design document for this coming in due course.

  I fixed the random segfaults that were occurring on the RISC-V Inria
  CI worker (#[10349]).

  In Flambda 2 land we spent two person-days debugging a problem
  relating to Infix_tag!  We discovered that the code in OCaml 4.12
  onwards for traversing GC roots in static data ("caml_globals") is not
  correct if any of the roots are closures.  This arises in part because
  the new compaction code (#[9728]) has a hidden invariant: it must not
  see any field of a static data root more than once (not even via an
  Infix_tag).  As far as we know, these situations do not arise in the
  existing compiler, although we may propose a patch to guard against
  them.  They arise with Flambda 2 because in order to compile
  statically-allocated inconstant closures (ones whose environment is
  partially or wholly computed at runtime) we register closures directly
  as global roots, so we can patch their environments later.


[10039] <https://github.com/ocaml/ocaml/pull/10039>

[10349] <https://github.com/ocaml/ocaml/pull/10349>

[9728] <https://github.com/ocaml/ocaml/pull/9728>


@garrigue (Jacques Garrigue)
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  I have been working on a number of PRs fixing bugs in the type system,
  which are now merged:
  • #[10277] fixes a theoretical bug in the principality of GADT type
     inference (#[10383] applies only in -principal mode)
  • #[10308] fixes an interaction between local open in patterns and the
     new syntax for introducing existential type variables
  • #[10322] is an internal change using a normal reference inside of a
     weak one for backtracking; the weak reference was an optimization
     when backtracking was a seldom used feature, and was not useful
     anymore
  • #[10344] fixes a bug in the delaying of the evaluation of optional
     arguments
  • #[10347] cleans up some code in the unification algorithm, after a
     strengthening of universal variable scoping
  • #[10362] fixes a forgotten normalization in the type checking
     algorithm

  Some are still in progress:
  • #[10348] improves the way expansion is done during unification, to
     avoid some spurious GADT related ambiguity errors
  • #[10364] changes the typing of the body of the cases of
     pattern-matchings, allowing to warn in some non-principal
     situations; it also uncovered a number of principality related bugs
     inside the the type-checker

  Finally, I have worked with Takafumi Saikawa (@t6s) on making the
  representation of types closer to its logical meaning, by ensuring
  that one always manipulate a normalized view in #[10337] (large
  change, evaluation in progress).


[10277] <https://github.com/ocaml/ocaml/pull/10277>

[10383] <https://github.com/ocaml/ocaml/pull/10383>

[10308] <https://github.com/ocaml/ocaml/pull/10308>

[10322] <https://github.com/ocaml/ocaml/pull/10322>

[10344] <https://github.com/ocaml/ocaml/pull/10344>

[10347] <https://github.com/ocaml/ocaml/pull/10347>

[10362] <https://github.com/ocaml/ocaml/pull/10362>

[10348] <https://github.com/ocaml/ocaml/pull/10348>

[10364] <https://github.com/ocaml/ocaml/pull/10364>

[10337] <https://github.com/ocaml/ocaml/pull/10337>


@let-def (Frédéric Bour)
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  For some time, I have been working on new approaches to generate error
  messages from a Menhir parser.

  My goal at the beginning was to detect and produce a precise message
  for the ‘let ;’ situation:
  ┌────
  │ let x = 5;
  │ let y = 6
  │ let z = 7
  └────
  LR detects an error at the third ‘let’ which is technically correct,
  although we would like to point the user at the ‘;’ which might be the
  root cause of the error. This goal has been achieved, but the
  prototype is far from being ready for production.

  The main idea to increase the expressiveness and maintainability of
  error context identification is to use a flavor of regular
  expressions.  The stack of a parser defines a prefix of a sentential
  form. Our regular expressions are matched against it. Internal details
  of the automaton does not leak (no reference to states), the regular
  language is defined by the grammar alone.  With appropriate tooling,
  specific situations can be captured by starting from a coarse
  expression and refining it to narrow down the interesting cases.

  Now I am focusing on one specific point of the ‘error message’
  development pipeline: improving the efficiency of ‘menhir
  –list-errors’.  This command is used to enumerate sentences that cover
  all erroneous situations (as defined by the LR grammar). On my
  computer and with the OCaml grammar, it takes a few minutes and quite
  a lot of RAM. Early results are encouraging and I hope to have a PR
  for Menhir soon. The performance improvement we are aiming for is to
  make the command almost real time for common grammars and to tackle
  bigger grammars by reducing the memory needs.  For instance, in the
  OCaml case, the runtime is down from 3 minutes to 2–3 seconds and
  memory consumption goes from a few GiB down to 200 MiB.


Daniel Bünzli asked and gasche replied
──────────────────────────────────────

        > […] @Ekdohibs’ project [camlboot ], which is a
          “bootstrap-free”
        > implementation of OCaml able to compile the OCaml
          compiler itself. It currently targets OCaml 4.07 for
          various
        > reasons. We were able to do a full build of the OCaml
          compiler, and check that the result produces bootstrap
        > binaries that coincide with upstream bootstraps. This
          gives extremely strong confidence that the OCaml
          bootstrap is
        > free from “trusting trust” attacks. For more details,
          see our [draft paper].

        Something that is not clear to me (but I read quickly) is
        the impact of `guile` itself being not bootstrapped yet.
        Could there be a *very* elaborate attack (with probability
        0 of existing) on both the guile and ocaml bootstrap or is
        there something in the whole scheme that prevents it ?

  Yes, currently Guile needs to be trusted, and it would be possible
  that a bootstrapping virus in Guile would break our correctness
  result. (It would need to reproduce itself through our compiler and
  interpreter that were written after Guile itself, but I think in
  theory this could be done with an almost-infinitely clever program
  analysis.) Of course, an attack at the source level (inserting
  malicious source, instead of malicious binaries) is also possible
  anywhere in the chain.  Our main reason for using Guile is that this
  is the high-level language community most active on
  debootstrapping-towards-the-metal (through the Guix connection), so we
  believe it is more likely to manage debootstrapping and maintain it in
  the longer run.

  (The seed that Guile depends on is its macro-expander, which is
  written using macros itself. In theory one may perform the
  macro-expansion of the expander, and then manually review the two
  versions to verify the absence of attack there.)


[camlboot ] <https://github.com/Ekdohibs/camlboot>

[draft paper] <http://gallium.inria.fr/~scherer/drafts/camlboot.pdf>


After so many years, I discover 'Str.bounded_full_split regexp str n'
═════════════════════════════════════════════════════════════════════

  Archive:
  <https://discuss.ocaml.org/t/after-so-many-years-i-discover-str-bounded-full-split-regexp-str-n/7838/1>


UnixJunkie said
───────────────

  This is so useful and powerful:
  ┌────
  │ #require "str";;
  │ Str.bounded_full_split (Str.regexp "[()]") "toto (titi, tata (et tutu)) vont au parc (en courant)" 1024;;
  │ - : Str.split_result list =
  │ [Str.Text "toto "; Str.Delim "("; Str.Text "titi, tata "; Str.Delim "(";
  │  Str.Text "et tutu"; Str.Delim ")"; Str.Delim ")"; Str.Text " vont au parc ";
  │  Str.Delim "("; Str.Text "en courant"; Str.Delim ")"]
  └────

  Still finding hidden pearls in the stdlib after so many years!
  :slight_smile:


Parser for the Scala programming language?
══════════════════════════════════════════

  Archive:
  <https://discuss.ocaml.org/t/parser-for-the-scala-programming-language/7541/18>


Deep in this thread, Yoann Padioleau announced
──────────────────────────────────────────────

  I ended up porting the recursive descent parser in the Scala compiler
  to OCaml …  I think it was the fastest way to get a working parser
  from OCaml …

  <https://github.com/returntocorp/pfff/blob/develop/lang_scala/parsing/Parser_scala_recursive_descent.ml>


Old CWN
═══════

  If you happen to miss a CWN, you can [send me a message] and I'll mail
  it to you, or go take a look at [the archive] or the [RSS feed of the
  archives].

  If you also wish to receive it every week by mail, you may subscribe
  [online].

  [Alan Schmitt]


[send me a message] <mailto:alan.schmitt@polytechnique.org>

[the archive] <https://alan.petitepomme.net/cwn/>

[RSS feed of the archives] <https://alan.petitepomme.net/cwn/cwn.rss>

[online] <http://lists.idyll.org/listinfo/caml-news-weekly/>

[Alan Schmitt] <https://alan.petitepomme.net/>


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Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-03  7:35 Alan Schmitt
2019-10-15  7:28 Alan Schmitt
2019-11-05  6:55 Alan Schmitt
2019-11-12 13:21 Alan Schmitt
2019-11-26  8:33 Alan Schmitt
2019-12-03 15:43 Alan Schmitt
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2019-12-17  8:52 Alan Schmitt
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