1,721,047 research outputs found
Using standard typing algorithms incrementally
Full text linkModern languages are equipped with static type checking/inference that helps programmers to keep a clean programming style and to reduce errors. However, the ever-growing size of programs and their continuous evolution require building fast and efficient analysers. A promising solution is incrementality, aiming at only re-typing the diffs, i.e. those parts of the program that change or are inserted, rather than the entire codebase. We propose an algorithmic schema that drives an incremental usage of existing, standard typing algorithms with no changes. Ours is a grey-box approach: just the shape of the input, that of the results and some domain-specific knowledge are needed to instantiate our schema. Here, we present the foundations of our approach and the conditions for its correctmess. We show it at work to derive two different incremental typing algorithms. The first type checks an imperative language to detect information flow and non-interference, and the second infers types for a functional language. We assessed our proposal on a prototypical imple- mentation of an incremental type checker. Our experiments show that using the type checker incrementally is (almost) always rewardin
A brief tour of formally secure compilation
Full text linkModern programming languages provide helpful high-level abstractions and mechanisms (e.g. types, module, automatic memory management) that enforce good programming practices and are crucial when writing correct and secure code. However, the security guarantees provided by such abstractions are not preserved when a compiler translates a source program into object code. Formally secure compilation is an emerging research field concerned with the design and the implementation of compilers that preserve source-level security properties at the object level. This paper presents a short guided tour of the relevant literature on secure compilation. Our goal is to help newcomers to grasp the basic concepts of this field and, for this reason, we rephrase and present the most relevant results in the literature in a common setting
Towards effective preservation of robust safety properties
No full textSecure compilation investigates when compilation chains preserve security properties. Over the years, different formal criteria and proof techniques have been put forward for proving a compiler secure. However, these proposals require a lot of manual effort by compiler designers. This paper introduces a formal approach to mechanically support these efforts. We focus on the specific class of robust safety properties and we propose a translation validation approach that leverages program analysis techniques to check that a compilation run preserves security
A semantics for disciplined concurrency in COP
No full textA concurrent extension of the recent COP language MLCoDa is presented. We formalise its operational semantics and we propose a run time verification mechanism that enforces a notion of non-interference among concurrent threads. More precisely, this mechanism prevents an application from modifying the context so as to dispose some resources or to contradict assumptions upon which other applications rely
Translation Validation for Security Properties
Full text linkSecure compilation aims to build compilation chains that preserve security properties when translating programs from a source to a target language. Recent research led to the definition of secure compilation principles that, if met, guarantee that the compilation chain in hand never violates specific families of security properties. Still, to the best of our knowledge, no effective procedure is available to check if a compilation chain meets such requirements. Here, we outline our ongoing research inspired by translation validation, to effectively check one of those principles
A. Chizzo, "testimone di un dono che è oltre ogni attesa". Giovani, fede, partecipazione: una passione educativa.
No full textNell’ambito delle sue esperienze didattiche, Vittorino Chizzolini è ben consapevole del valore dell’ambiente e delle sue risorse. Nel vivo di una pratica educativa intensamente vissuta, egli elabora in modo consapevolmente pedagogico il suo pensiero e la sua azione progettuale: la fraternità nelle relazioni, il rifiuto dell’erudizione come sfoggio di cultura, la valorizzazione del contributo delle persone, il distacco da posizioni e vantaggi provenienti dal potere, la dedizione – umile, povera e obbediente – per fare strada ai giovani, un tratto umano inclusivo e in grado di costruire in modo partecipativo reti manifeste e coraggiose
Mechanical incrementalization of typing algorithms
No full textThe ever-growing size of programs and their continuous evolution require building fast and efficient analyzers. Here we focus on the static ones, in particular on type systems, for both checking and inference. Just as programs change by incrementally changing or inserting pieces of code, called diffs, also type systems should be incremental and re-type the diffs, only. An algorithmic schema is proposed that mechanically derives an incremental version of existing, standard typing algorithms. Ours is a grey-box approach: just the shape of the typing rules, that of the types and some domain-specific knowledge are needed to instantiate our schema. Here, we present the foundations of our approach and the conditions for its correctness. Our schema is applied to derive four incremental typing and inference algorithms for languages in different programming paradigms. We implemented an OCaml module that inputs a type system and outputs its incrementalized version. Experimental results show that our approach is effective, and prove its usage beneficial
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
La pedagogia dell'amore di Vittorino Chizzolini.
No full textIl saggio presenta la figura di Vittorino Chizzolini, maestro, pedagogista, animatore dell'editrice La Scuola. Un uomo mite, umile e al tempo stesso autorevole maestro e instancabile promotore di iniziative destinate a lasciare il segno nella vita dei giovani che ne venivano coinvolti, nella comunità degli insegnanti, nella chiesa bresciana e più in generale nella comunità civile. In particolare il contributo si sofferma su 4 dimensioni fondamentali:
1. la dimensione magistrale;
2. la dimensione spirituale;
3. la dimensione operativa:
4. la dimensione personal
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