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检索条件"任意字段=19th International Symposium on Logic-Based Program Synthesis and Transformation"

共 158 条记录，以下是121-130 订阅

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19th international symposium on Automated Technology for Verification and Analysis, ATVA 2021

19th International Symposium on Automated Technology for Ver...

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19th international symposium on Automated Technology for Verification and Analysis, ATVA 2021

ISBN: (纸本)9783030888848

the proceedings contain 24 papers. the special focus in this conference is on Automated Technology for Verification and Analysis. the topics include: Live synthesis;faster Pushdown Reachability Analysis with Applications in Network Verification;verifying Verified Code;probabilistic Causes in Markov Chains;TEMPEST - synthesis Tool for Reactive Systems and Shields in Probabilistic Environments;AQUA: Automated Quantized Inference for Probabilistic programs;Proving SIFA Protection of Masked Redundant Circuits;verification by Gambling on program Slices;runtime Enforcement of Hyperproperties;determinization and Limit-Determinization of Emerson-Lei Automata;compositional synthesis of Modular Systems;event-B Refinement for Continuous Behaviours Approximation;incorporating Monitors in Reactive synthesis Without Paying the Price;pyNeVer: A Framework for Learning and Verification of Neural Networks;property-Directed Verification and Robustness Certification of Recurrent Neural Networks;automatic Discovery of Fair Paths in Infinite-State Transition Systems;Certifying DFA Bounds for Recognition and Separation;AALpy: An Active Automata Learning Library;Learning Linear Temporal Properties from Noisy Data: A MaxSAT-based Approach;mining Interpretable Spatio-Temporal logic Properties for Spatially Distributed Systems;A Formal Semantics of the GraalVM Intermediate Representation;A Verified Decision Procedure for Orders in Isabelle/HOL.

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Denotation by transformation towards obtaining a denotational semantics by transformation to point-free style

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17th international symposium on logic-based program synthesis and transformation, LOPSTR 2007

作者： Braßel, Bernd Christiansen, Jan Institute of Computer Science University of Kiel Kiel 24098 Germany

ISBN: (纸本)3540787682

It has often been observed that a point-free style of programming provides a more abstract view on programs. We aim to use the gain in abstraction to obtain a denotational semantics for functional logic languages in a straightforward way. Here we propose a set of basic operations based on which arbitrary functional logic programs can be transformed to point-free programs. the semantics of the resulting programs are strict but, nevertheless, the semantics of the original program is preserved. there is a one-to-one mapping from the primitives introduced by the transformation to operations in relation algebra. this mapping can be extended to obtain a relation algebraic model for the whole program. this yields a denotational semantics which is on one hand closely related to point-free functional logic programs and on the other hand connects to the well-developed field of algebraic logic including automatic proving. © 2008 Springer Berlin Heidelberg.

关键词： Semantics

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Completeness of unfolding for rewriting logic theories

Completeness of unfolding for rewriting logic theories

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作者： Alpuente, María Baggi, Michele Falaschi, Moreno Ballis, Demis DSIC Universidad Politécnica de Valencia Camino de Vera s/n 46071 Valencia Spain Dip. di Scienze Matematiche e Informatiche Pian dei Mantellini 44 53100 Siena Italy Dip. Matematica e Informatica Via delle Scienze 206 33100 Udine Italy

ISBN: (纸本)9780769543246

Many transformation systems for program optimization, program synthesis, and program specialization are based on fold/unfold transformations. In this paper, we investigate the semantic properties of a narrowing-based unfolding transformation that is useful to transform rewriting logic theories. We also present a transformation methodology that is able to determine whether an unfolding transformation step would cause incompleteness and avoid this problem by completing the transformed rewrite theory with suitable extra rules. More precisely, our methodology identifies the sources of incompleteness and derives a set of rules that are added to the transformed rewrite theory in order to preserve the semantics of the original theory. © 2010 IEEE.

关键词： Semantics

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Efficient local unfolding with ancestor stacks for full Prolog

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14th international symposium on logic based program synthesis and transformation

作者： Puebla, G Albert, E Hermenegildo, M Tech U Madrid Sch Comp Sci Madrid Spain Univ Complutense Madrid Sch Comp Sci Madrid Spain Univ New Mexico Dept Comp Sci Albuquerque NM 87131 USA Univ New Mexico Dept Elect & Comp Engn Albuquerque NM 87131 USA

ISBN: (纸本)3540266550

the integration of powerful partial evaluation methods into practical compilers for logic programs is still far from reality. this is related both to 1) efficiency issues and to 2) the complications of dealing with practical programs. Regarding efficiency, the most successful unfolding rules used nowadays are based on structural orders applied over (covering) ancestors, i.e., a subsequence of the atoms selected during a derivation. Unfortunately, maintaining the structure of the ancestor relation during unfolding introduces significant overhead. We propose an efficient, practical local unfolding rule based on the notion of covering ancestors which can be used in combination with any structural order and allows a stack-based implementation without losing any opportunities for specialization. Regarding the second issue, we propose assertion-based techniques which allow our approach to deal with real programs that include (Prolog) built-ins and external predicates in a very extensible manner. Finally, we report on our implementation of these techniques in a practical partial evaluator, embedded in a state of the art compiler which uses global analysis extensively (the Ciao compiler and, specifically, its preprocessor CiaoPP). the performance analysis of the resulting system shows that our techniques, in addition to dealing with practical programs, are also significantly more efficient in time and somewhat more efficient in memory than traditional tree-based implementations.

关键词： logic programming

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On Uniquely Closable and Uniquely Typable Skeletons of Lambda Terms 27th

On Uniquely Closable and Uniquely Typable Skeletons of Lambd...

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27th international symposium on logic-based program synthesis and transformation (LOPSTR)

作者： Bodini, Olivier Tarau, Paul UMR CNRS 7030 Lab Informat Paris Nord Paris France Univ North Texas Dept Comp Sci & Engn Denton TX 76203 USA

ISBN: (纸本)9783319944609;9783319944593

Uniquely closable skeletons of lambda terms are Motzkintrees that predetermine the unique closed lambda term that can be obtained by labeling their leaves with de Bruijn indices. Likewise, uniquely typable skeletons of closed lambda terms predetermine the unique simply-typed lambda term that can be obtained by labeling their leaves with de Bruijn indices. We derive, through a sequence of logic program transformations, efficient code for their combinatorial generation and study their statistical properties. As a result, we obtain context-free grammars describing closable and uniquely closable skeletons of lambda terms, opening the door for their in-depth study with tools from analytic combinatorics. Our empirical study of the more difficult case of (uniquely) typable terms reveals some interesting open problems about their density and asymptotic behavior. As a connection between the two classes of terms, we also show that uniquely typable closed lambda term skeletons of size 3n + 1 are in a bijection with binary trees of size n.

关键词： Deriving efficient logic programs logic programming and computational mathematics Combinatorics of lambda terms Inferring simple types Uniquely closable lambda term skeletons Uniquely typable lambda term skeletons

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Multivariant Assertion-based Guidance in Abstract Interpretation 28th

Multivariant Assertion-Based Guidance in Abstract Interpreta...

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28th international symposium on logic-based program synthesis and transformation (LOPSTR(

作者： Garcia-Contreras, Isabel Morales, Jose F. Hermenegildo, Manuel, V IMDEA Software Inst Madrid Spain Univ Politecn Madrid UPM Madrid Spain

ISBN: (纸本)9783030138387;9783030138370

Approximations during program analysis are a necessary evil, as they ensure essential properties, such as soundness and termination of the analysis, but they also imply not always producing useful results. Automatic techniques have been studied to prevent precision loss, typically at the expense of larger resource consumption. In both cases (i.e., when analysis produces inaccurate results and when resource consumption is too high), it is necessary to have some means for users to provide information to guide analysis and thus improve precision and/or performance. We present techniques for supporting within an abstract interpretation framework a rich set of assertions that can deal with multivariance/context-sensitivity, and can handle different run-time semantics for those assertions that cannot be discharged at compile time. We show how the proposed approach can be applied to both improving precision and accelerating analysis. We also provide some formal results on the effects of such assertions on the analysis results.

关键词： program analysis Multivariance Context sensitivity Abstract interpretation Assertions Static analysis User guidance

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Type-based homeomorphic embedding and its applications to online partial evaluation

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17th international symposium on logic-based program synthesis and transformation

作者： Albert, Elvira Gallagher, John Gomez-Zamalloa, Miguel Puebla, German Univ Complutense Madrid DSIC E-28040 Madrid Spain Roskilde Univ CBIT DK-4000 Roskilde Denmark Tech Univ Madrid CLIP E-28660 Madrid Spain

ISBN: (纸本)9783540787686

Homeomorphic Embedding (HEm) has proven to be very powerful for supervising termination of computations, provided that such computations are performed over a finite signature, i.e., the number of constants and function symbols involved is finite. However, there are situations, for example numeric computations, which involve an infinite (or too large) signature, in which HEm does not guarantee termination. Some extensions to HEm for the case of infinite signatures have been proposed which guarantee termination, but they either do not provide systematic means for generating such extensions or the extensions are too simplistic and do not produce the expected results in practice. We introduce Type-based Homeomorphic Embedding (TbHEm) as an extension of the standard, untyped HEm to deal with infinite signatures. In the paper, we show how TbHEm can be used to improve the accuracy of online partial evaluation. For this purpose, we propose an approach to constructing suitable types for partial evaluation automatically based on existing analysis tools for constraint logic programs. We also present useful properties of types which allow us to take full advantage of TbHEm in practice. Experimental results are reported which show that our work improves the state of the practice of online partial evaluation.

关键词： logic programming

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A Hiking Trip through the Orders of Magnitude: Deriving Efficient Generators for Closed Simply-Typed Lambda Terms and Normal Forms 26th

A Hiking Trip Through the Orders of Magnitude: Deriving Effi...

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26th international symposium on logic-based program synthesis and transformation (LOPSTR)

作者： Tarau, Paul Univ North Texas Dept Comp Sci & Engn Denton TX 76203 USA

ISBN: (纸本)9783319631394;9783319631387

Contrary to several other families of lambda terms, no closed formula or generating function is known and none of the sophisticated techniques devised in analytic combinatorics can currently help with counting or generating the set of simply-typed closed lambda terms of a given size. Moreover, their asymptotic scarcity among the set of closed lambda terms makes counting them via brute force generation and type inference quickly intractable, with previous published work showing counts for them only up to size 10. By taking advantage of the synergy between logic variables, unification with occurs check and efficient backtracking in today's Prolog systems, we climb 4 orders of magnitude above previously known counts by deriving progressively faster Horn Clause programs that generate and/or count the set of closed simply-typed lambda terms of sizes up to 14. A similar count for closed simply-typed normal forms is also derived up to size 14.

关键词： logic programming transformations Type inference Combinatorics of lambda terms Simply-typed lambda calculus Simply-typed normal forms

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An Assertion Language for Slicing Constraint logic Languages 28th

An Assertion Language for Slicing Constraint Logic Languages

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28th international symposium on logic-based program synthesis and transformation (LOPSTR(

作者： Falaschi, Moreno Olarte, Carlos Univ Siena Dept Informat Engn & Math Siena Italy Univ Fed Rio Grande do Norte ECT Natal RN Brazil

ISBN: (纸本)9783030138387;9783030138370

Constraint logic programming (CLP) is a language scheme for combining two declarative paradigms: constraint solving and logic programming. Concurrent Constraint programming (CCP) is a declarative model for concurrency where agents interact by telling and asking constraints in a shared store. In a previous paper, we developed a framework for dynamic slicing of CCP where the user first identifies that a (partial) computation is wrong. then, she marks (selects) some parts of the final state corresponding to the data (constraints) and processes that she wants to study more deeply. An automatic process of slicing begins, and the partial computation is "depurated" by removing irrelevant information. In this paper we give two major contributions. First, we extend the framework to CLP, thus generalizing the previous work. Second, we provide an assertion language suitable for both, CCP and CLP, which allows the user to specify some properties of the computations in her program. If a state in a computation does not satisfy an assertion then some "wrong" information is identified and an automatic slicing process can start. We thus make one step further towards automatizing the slicing process. We show that our framework can be integrated with the previous semi-automatic one, giving the user more choices and flexibility. We show by means of examples and experiments the usefulness of our approach.

关键词： Concurrent Constraint programming Constraint logic programming Dynamic slicing Debugging Assertion language

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A Productivity Checker for logic programming 26th

A Productivity Checker for Logic Programming

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26th international symposium on logic-based program synthesis and transformation (LOPSTR)

作者： Komendantskaya, Ekaterina Johann, Patricia Schmidt, Martin Heriot Watt Univ Edinburgh Midlothian Scotland Appalachian State Univ Boone NC 28608 USA Univ Osnabruck Osnabruck Germany

ISBN: (纸本)9783319631394;9783319631387

Automated analysis of recursive derivations in logic programming is known to be a hard problem. Both termination and non-termination are undecidable problems in Turing-complete languages. However, some declarative languages offer a practical work-around for this problem, by making a clear distinction between whether a program is meant to be understood inductively or coinductively. For programs meant to be understood inductively, termination must be guaranteed, whereas for programs meant to be understood coinductively, productive non-termination (or "productivity") must be ensured. In practice, such classification helps to better understand and implement some non-terminating computations. logic programming was one of the first declarative languages to make this distinction: in the 1980's, Lloyd and van Emden's "computations at infinity" captured the big-step operational semantics of derivations that produce infinite terms as answers. In modern terms, computations at infinity describe "global productivity" of computations in logic programming. Most programming languages featuring coinduction also provide an observational, or small-step, notion of productivity as a computational counterpart to global productivity. this kind of productivity is ensured by checking that finite initial fragments of infinite computations can always be observed to produce finite portions of their infinite answer terms. In this paper we introduce a notion of observational productivity for logic programming as an algorithmic approximation of global productivity, give an effective procedure for semi-deciding observational productivity, and offer an implemented automated observational productivity checker for logic programs.

关键词： logic programming Corecursion Coinduction Termination Productivity

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