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class="datatemplateentry"> <p> <br/> </p> <div class="wrap_right plugin_wrap"> <p> <div class="bs-wrap bs-wrap-well well"> <span class="bs-wrap bs-wrap-button" data-btn-type="primary" data-btn-size="sm" data-btn-disabled="1">Groupe de travail</span> </p> <div class=""> <p> <span class="bs-wrap bs-wrap-label label label-default">Pôle</span> <a href="https://www.irif.fr/seminaires/programmation/0_pageid" class="wikilink2" title="seminaires:programmation:0_pageid" rel="nofollow" data-wiki-id="seminaires:programmation:0_pageid"><a href="https://www.irif.fr/poles/pps/index" class="wikilink1" title="poles:pps:index" data-wiki-id="poles:pps:index">Preuves, programmes et systèmes</a></a><br/> </p> </div><div class=""> <p> <span class="bs-wrap bs-wrap-label label label-default">Équipe thématique</span> <a href="https://www.irif.fr/seminaires/programmation/0_pageid" class="wikilink2" title="seminaires:programmation:0_pageid" rel="nofollow" data-wiki-id="seminaires:programmation:0_pageid"><a href="https://www.irif.fr/equipes/programmes/index" class="wikilink1" title="equipes:programmes:index" data-wiki-id="equipes:programmes:index">Programmes et Langages (PL)</a></a><br/> </p> </div> <p> </div> </p> <div style='display:none'><div class="wrap_right plugin_wrap"> <p> <span class="bs-wrap bs-wrap-button" data-btn-type="default"><a href="https://www.irif.fr/admindb/seminaires/" class="urlextern" title="https://www.irif.fr/admindb/seminaires/" rel="ugc nofollow">Gestion des séances</a></span> </p> </div></div></div> <h2 id="programmation" class=" page-header pb-3 mb-4 mt-5">Programmation</h2> <div class="level2"> <p> <br/> </p> </div> <h4 id="jour_heure_et_lieu">Jour, heure et lieu</h4> <div class="level4"> <p> Le Lundi à 10h, IRIF, Sophie Germain </p> <p> Le <a href="http://www.irif.fr/_media/ical/programmation.ics" class="urlextern" title="http://www.irif.fr/_media/ical/programmation.ics" rel="ugc nofollow">calendrier</a> des séances (format iCal). <br/> Pour ajouter le calendrier des séances à votre agenda favori, souscrire au calendrier en indiquant ce lien. </p> <p> <br/> </p> </div> <h4 id="contact_s">Contact(s)</h4> <div class="level4"> <div class=""> <p> <a href="https://www.irif.fr/~jkrivine" class="urlextern" title="https://www.irif.fr/~jkrivine" rel="ugc nofollow">Jean Krivine</a><br/> </p> </div> </div> </div> <p> <br/> </p> <div class="level0"> <p> <a href="https://www.irif.fr/equipes/programmes/index" class="urlextern" title="https://www.irif.fr/equipes/programmes/index" rel="ugc nofollow">https://www.irif.fr/equipes/programmes/index</a> </p> </div> </div> <p> <br/> </p> <h3 class="sectionedit3 page-header pb-3 mb-4 mt-5" id="prochaine_seance">Prochaine séance</h3> <div class="level3"> <p> <a href="https://www.irif.fr/seminaires/programmation/index" class="wikilink1" title="seminaires:programmation:index" data-wiki-id="seminaires:programmation:index">Programmation</a><br/> Lundi 25 novembre 2024, 15 heures 30, 3052<br/> <strong>Alexandre Moine</strong> (NYU) <em>Reaching for Unreachability Properties in Separation Logic</em> <span class="bs-wrap bs-wrap-button" data-btn-type="link" data-btn-size="xs" data-btn-collapse="b14-2947"><i class="dw-icons fa-lg fa fa-info-circle" style="color:#777" title=""></i></span><br/> </p> <div class="bs-wrap bs-wrap-collapse collapse" id="b14-2947"><div class="bs-wrap bs-wrap-well well well-sm"> Unreachability is a property at the heart of garbage collection: if a location is unreachable, it can be safely deallocated. However, formally reasoning about unreachability is challenging. Indeed, to prove that a location is unreachable, one has to consider the whole heap and possibly multiple concurrent stacks, making local reasoning apparently out of reach. In this talk, I will present two projects tackling the challenge of unreachability. <p> In the first part, I will present my PhD thesis work: an Iris-fueled Separation Logic with space credits, allowing for the verification of heap space bounds in the presence of concurrency and garbage collection. Crucially, this logic tracks the reachability of heap objects in a modular way, and allows for recovering space credits when the user proves an object unreachable. </p> <p> In the second part, I will present another line of work about disentanglement. Disentanglement is a property of parallel programs asserting that a location allocated by a task must remain unreachable by concurrently executing tasks. Making use of disentanglement, the MPL (MaPLe) compiler for parallel ML equips programs with a blazingly fast, task-local, garbage collector. I will present DisLog, an Iris-fueled Separation Logic for verifying disentanglement, and present ongoing work on TypeDis, a type system for automatically verifying disentanglement. </div> </p> </div> <p> Attention salle et horaire inhabituels </p> <p> <br/> </p> </div> <h3 class="sectionedit4 page-header pb-3 mb-4 mt-5" id="seances_passees">Séances passées</h3> <div class="level3"> <p> <br/> </p> </div> <h4 id="annee_2024">Année 2024</h4> <div class="level4"> </div> <div class="plugin_include_content plugin_include__seminaires:programmation:programmation2024" id="plugin_include__seminaires__programmation__programmation2024"> <div class="level4"> <p> <a href="https://www.irif.fr/seminaires/programmation/index" class="wikilink1" title="seminaires:programmation:index" data-wiki-id="seminaires:programmation:index">Programmation</a><br/> Lundi 18 novembre 2024, 10 heures, 3071<br/> <strong>Guillaume Baudart</strong> (IRIF) <em>Natural Language Intermediate Representation for Mechanized Theorem Proving</em> <span class="bs-wrap bs-wrap-button" data-btn-type="link" data-btn-size="xs" data-btn-collapse="b14-2948"><i class="dw-icons fa-lg fa fa-info-circle" style="color:#777" title=""></i></span><br/> </p> <div class="bs-wrap bs-wrap-collapse collapse" id="b14-2948"><div class="bs-wrap bs-wrap-well well well-sm"> Formal theorem proving is challenging for humans as well as for machines. Thanks to recent advances in LLM capabilities, we believe natural language can serve as a universal interface for reasoning about formal proofs. In this talk, 1) we introduce Pétanque, a new lightweight environment to interact with the Coq theorem prover; 2) we present two interactive proof protocols leveraging natural language as an intermediate representation for designing proof steps; 3) we implement beam search over these interaction protocols, using natural language to rerank proof candidates; and 4) we use Pétanque to benchmark our search algorithms on different datasets. We will then discuss the limitations of our approach and possible future directions. </div> </div> <p> <a href="https://www.irif.fr/seminaires/programmation/index" class="wikilink1" title="seminaires:programmation:index" data-wiki-id="seminaires:programmation:index">Programmation</a><br/> Lundi 4 novembre 2024, 10 heures, 3071<br/> <strong>Thierry Martinez</strong> (INRIA) <em>Coq Deep Pattern-Matching using Small Inversion</em> <span class="bs-wrap bs-wrap-button" data-btn-type="link" data-btn-size="xs" data-btn-collapse="b14-2949"><i class="dw-icons fa-lg fa fa-info-circle" style="color:#777" title=""></i></span><br/> </p> <div class="bs-wrap bs-wrap-collapse collapse" id="b14-2949"><div class="bs-wrap bs-wrap-well well well-sm"> I will present joint work with Pierre Boutillier, Hugo Herbelin, and Meven Lennon-Bertrand. We are implementing a new algorithm, described in Pierre's PhD thesis and further developed during Meven's internship, for pattern-matching elaboration in Coq. This algorithm starts from a richer form of pattern-matching than what is currently available by default in Coq, handling deep and multiple pattern-matching with dependent types, as proposed by Thierry Coquand in the 1990s, while targeting the same elementary form of pattern-matching present in the Coq kernel. <p> Most of the design challenges for this algorithm come from handling the equalities that appear at each level of deconstruction of dependent inductive values. I will compare three approaches: one proposed by Healfdene Goguen, Conor McBride, and James McKinna, which relies on the equivalence axiom between homogeneous and heterogeneous equalities (equivalent to the Uniqueness of Identity Proofs); a refinement proposed by Jesper Cockx, which avoids the need for axioms; and the encoding by small inversion, which moves the proofs of deconstruction of the dependencies from the term level to the type level. While these algorithms give an encoding of dependent pattern-matching into the Coq kernel, this discussion leads us to think about what could be a better primitive form of pattern-matching. </div> </p> </div> <p> <a href="https://www.irif.fr/seminaires/programmation/index" class="wikilink1" title="seminaires:programmation:index" data-wiki-id="seminaires:programmation:index">Programmation</a><br/> Lundi 14 octobre 2024, 10 heures, 4071<br/> <strong>Pierre-Evariste Dagand</strong> (IRIF) <em>A type-theoretic model of smart contracts</em> <span class="bs-wrap bs-wrap-button" data-btn-type="link" data-btn-size="xs" data-btn-collapse="b14-2950"><i class="dw-icons fa-lg fa fa-info-circle" style="color:#777" title=""></i></span><br/> </p> <div class="bs-wrap bs-wrap-collapse collapse" id="b14-2950"><div class="bs-wrap bs-wrap-well well well-sm"> Smart contracts are programs that run on an interpreter cobbled together from a massively distributed network of mutually untrusting computers. Unsurprisingly, the unruly nature of the underlying execution engine has a profound impact on the behavior of the interpreter and thus the semantics of smart contracts. <p> Caught once again by my incurable curiosity, I have set out to delineate precisely what set smart contracts aside in the realm of programming languages. </p> <p> This talk reports on some early results, modeling the semantics of smart contracts in a type-theoretic and monadic framework. The objective of this work is to support formal reasoning at the protocol level (that is, starting from a specification free from programming error). </p> <p> We shall strive to stay on track and in good taste: the presentation will not cover any financial aspect of smart contracts. </div> </p> </div> <p> <a href="https://www.irif.fr/seminaires/programmation/index" class="wikilink1" title="seminaires:programmation:index" data-wiki-id="seminaires:programmation:index">Programmation</a><br/> Lundi 30 septembre 2024, 10 heures, 3071<br/> <strong>Gabriel Scherer</strong> (IRIF) <em>Pattern-matching on mutable values: danger!</em> <span class="bs-wrap bs-wrap-button" data-btn-type="link" data-btn-size="xs" data-btn-collapse="b14-2951"><i class="dw-icons fa-lg fa fa-info-circle" style="color:#777" title=""></i></span><br/> </p> <div class="bs-wrap bs-wrap-collapse collapse" id="b14-2951"><div class="bs-wrap bs-wrap-well well well-sm"> The OCaml pattern-matching compiler is unsound, it generates incorrect code in the obscure corner case where we match on a value with mutable fields, and those fields are mutated during pattern-matching – from when clauses, allocation callbacks, or an access race in concurrent execution. <p> We recall the overall compilation strategy of the OCaml compiler, and explain how to weaken its optimization information to remain correct on mutable data. </div> </p> </div> <p> ## Extended abstract </p> <p> <a href="https://www.irif.fr/~scherer/research/mutable-patterns/mutable-patterns-mlworkshop2024-abstract.pdf" class="urlextern" title="https://www.irif.fr/~scherer/research/mutable-patterns/mutable-patterns-mlworkshop2024-abstract.pdf" rel="ugc nofollow">https://www.irif.fr/~scherer/research/mutable-patterns/mutable-patterns-mlworkshop2024-abstract.pdf</a> </p> </div> </div> <div class="level4"> </div> </div></div><p> <style> .page a.urlextern, .page a.interwiki, .page a.windows, .page a.mail, .page a.media { padding-left: 0 !important; background: none !important; } .page { text-align: justify; } body {font-size: 15px; font-weight: 300; color: #333333; } b,strong {font-weight: 600; color: #333333; } p {margin-bottom:1.3em} h1 {font-size: 2.8em; margin-bottom:1.5em; font-weight: 400; } h2 {font-size: 2.2em; margin-bottom:1.2em; font-weight: 400; } h3 {font-size: 1.9em; margin-bottom:0.9em; font-weight: 400; } h4 {font-size: 1.7em; margin-bottom:0.8em; font-weight: 300; } h5 {font-size: 1.5em; margin-bottom:0.8em; font-weight: 300; } h5 {font-size: 1.4em; margin-bottom:0.8em; font-weight: 300; } </style> </p> </div> </div> <div class="small text-right"> </div> </article> </div> </main> <footer id="dw__footer" class="dw-container py-5 dokuwiki container-fluid">  <div class="dw-container small container-fluid mx-5"> <div class="footer-dw-title"> <div class="media"> <div class="media-left">  <img src="https://www.irif.fr/_media/logo_footer.png" alt="" class="media-object" style="height:10px" /> </div> <div class="media-body"> <div class="row"> <div class="col-sm-2"> <h4 class="media-heading"></h4> <p> </p> </div> <div class="col-sm-10"> </div> </div> </div> </div> </div> <a style="font-size:12px" href="https://www.irif.fr/informations/mentions-legales">Mentions légales</a> <div class="footer-license row"> <hr/> <div id="dw__license" class="col-sm-6"> </div> <div class="col-sm-6"> </div> </div> </div>  </footer> <a href="#dokuwiki__top" class="back-to-top hidden-print btn btn-default" title="Aller au contenu" accesskey="t"> <span class="iconify" data-icon="mdi:chevron-up"></span> </a> <div id="screen__mode"> <span class="visible-xs-block"></span> <span class="visible-sm-block"></span> <span class="visible-md-block"></span> <span class="visible-lg-block"></span> </div> <img src="https://www.irif.fr/lib/exe/taskrunner.php?id=seminaires%3Aprogrammation%3Aindex&1732399341" width="2" height="1" alt="" /> </div> </body> </html>