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Adding delimited and composable control to a production programming environment

acm sigplan NOTICES 2007年第9期42卷 165-176页

作者： Flatt, Matthew Yu, Gang Findler, Robert Bruce Felleisen, Matthias Univ Utah Salt Lake City UT 84112 USA Chinese Acad Sci Inst Software Beijing 100864 Peoples R China Univ Chicago Chicago IL 60637 USA Northeastern Univ Boston MA 02115 USA

Operators for delimiting control and for capturing composable continuations litter the landscape of theoretical programming language research. Numerous papers explain their advantages, how the operators explain each other (or don't), and other aspects of the operators' existence. Production programming languages, however, do not support these operators, partly because their relationship to existing and demonstrably useful constructs-such as exceptions and dynamic binding-remains relatively unexplored. In this paper, we report on our effort of translating the theory of delimited and composable control into a viable implementation for a production system. the report shows how this effort involved a substantial design element, including work with a formal model, as well as significant practical exploration and engineering. the resulting version of PLT Scheme incorporates the expressive combination of delimited and composable control alongside dynamic-wind, dynamic binding, and exception handling. None of the additional operators subvert the intended benefits of existing control operators, so that programmers can freely mix and match control operators.

关键词： design languages

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Temporal NetKAT

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acm sigplan NOTICES 2016年第6期51卷 386-401页

作者： Beckett, Ryan Greenberg, Michael Walker, David Princeton Univ Princeton NJ 08544 USA Pomona Coll Claremont CA 91711 USA

Over the past 5-10 years, the rise of software-defined networking (SDN) has inspired a wide range of new systems, libraries, hypervisors and languages for programming, monitoring, and debugging network behavior. Oftentimes, these systems are disjoint-one language for programming and another for verification, and yet another for run-time monitoring and debugging. In this paper, we present a new, unified framework, called Temporal NetKAT, capable of facilitating all of these tasks at once. As its name suggests, Temporal NetKAT is the synthesis of two formal theories: past-time (finite trace) linear temporal logic and (network) Kleene Algebra with Tests. Temporal predicates allow programmers to write down concise properties of a packet's path through the network and to make dynamic packet-forwarding, access control or debugging decisions on that basis. In addition to being useful for programming, the combined equational theory of LTL and NetKAT facilitates proofs of pathbased correctness properties. Using new, general, proof techniques, we show that the equational semantics is sound with respect to the denotational semantics, and, for a class of programs we call network-wide programs, complete. We have also implemented a compiler for temporal NetKAT, evaluated its performance on a range of benchmarks, and studied the effectiveness of several optimizations.

关键词： Software-defined networking Network programming languages Domain-specific languages Kleene algebra with tests NetKAT Temporal logic

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Synthesizing Transformations on Hierarchically Structured Data

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acm sigplan NOTICES 2016年第6期51卷 508-521页

作者： Yaghmazadeh, Navid Klinger, Christian Dillig, Isil Chaudhuri, Swarat Univ Texas Austin Austin TX 78712 USA Univ Freiburg Freiburg Germany Rice Univ Houston TX 77251 USA

this paper presents a new approach for synthesizing transformations on tree-structured data, such as Unix directories and XML documents. We consider a general abstraction for such data, called hierarchical data trees (HDTs) and present a novel example-driven synthesis algorithm for HDT transformations. Our central insight is to reduce the problem of synthesizing tree transformers to the synthesis of list transformations that are applied to the paths of the tree. the synthesis problem over lists is solved using a new algorithm that combines SMT solving and decision tree learning. We have implemented our technique in a system called HADES and show that HADES can automatically synthesize a variety of interesting transformations collected from online forums.

关键词： languages Program synthesis programming by example data transformations

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Classbox/J: Controlling the scope of change in Java

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acm sigplan NOTICES 2005年第10期40卷 177-189页

作者： Bergel, A Ducasse, S Nierstrasz, O Univ Bern Software Composit Grp Bern Switzerland Univ Savoie Language & Software Evolut Grp LISTIC Chambery France

Unanticipated changes to complex software systems can introduce anomalies such as duplicated code, suboptimal inheritance relationships and a proliferation of run-tirne downcasts. Refactoring to eliminate these anomalies may not be an option, at least in certain stages of software evolution. Classboxes are modules that restrict the visibility of changes to selected clients only, thereby offering more freedom in the way unanticipated changes may be implemented, and thus reducing the need for convoluted design anomalies. In this paper we demonstrate how classboxes can be implemented in statically-typed languages like Java. We also present an extended case study of Swing, a Java GUI package built on top of AWT, and we document the ensuing anomalies that Swing introduces. We show how Classbox/J, a prototype implementation of classboxes for Java, is used to provide a cleaner implementation of Swing using local refinement rather than subclassing.

关键词： language design module package open-classes class extension

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Parametric polymorphism for software component architectures

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acm sigplan NOTICES 2005年第10期40卷 147-166页

作者： Oancea, CE Watt, SM Univ Western Ontario Dept Comp Sci London ON Canada

Parametric polymorphism has become a common feature of mainstream programming languages, but software component architectures have lagged behind and do not support it. We examine the problem of providing parametric polymorphism with components combined from different programming languages. We have investigated how to resolve different binding times and parametrization semantics in a range of representative languages and have identified a common ground that can be suitably mapped to different language bindings. We present a generic component architecture extension that provides support for parameterized components and that can be easily adapted to work oil top of various software component architectures in use today (e.g., CORBA, DCOM, JNI). We have implemented and tested this architecture on top Of CORBA. We also present Generic Interface Definition language (GIDL), an extension to CORBA-IDL supporting generic types and we describe language bindings for C++, Java and Aldor. We explain our implementation of GIDL, consisting of a GIDL to IDL compiler and tools for generating linkage code under the language bindings. We demonstrate how this architecture can be used to access C++'s STL, and Aldor's BasicMath libraries in a multi-language environment and discuss our mappings in the context of automatic library interface generation.

关键词： languages design antiunification generics parametric polymorphisrn software component architecture templates

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AtomCaml: First-class atomicity via rollback

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acm sigplan NOTICES 2005年第9期40卷 92-104页

作者： Ringenburg, MF Grossman, D Univ Washington Dept Comp Sci & Engn Seattle WA 98195 USA

We have designed, implemented, and evaluated AtomCaml, an extension to Objective Caml that provides a synchronization primitive for atomic (transactional) execution of code. A first-class primitive function of type (unit -> 'a) -> 'a evaluates its argument (which may call other functions, even external C functions) as though no other thread has interleaved execution. Our design ensures fair scheduling and obstruction-freedom. Our implementation extends the Objective Cam] bytecode compiler and run-time system to support atomicity. A logging-and-rollback approach lets us undo uncompleted atomic blocks upon thread pre-emption, and retry them when the thread is rescheduled. the mostly functional nature of the Caml language and the Objective Caml implementation's commitment to a uniprocessor execution model (i.e., threads are interleaved, not executed simultaneously) allow particularly efficient logging. We have evaluated the efficiency and ease-of-use of AtomCaml by writing libraries and microbenchmarks, writing a small application, and replacing all locking with atomicity in an existing, large multithreaded application. Our experience indicates the performance overhead is negligible, atomic helps avoid synchronization mistakes, and idioms such as condition variables adapt reasonably to the atomic approach.

关键词： languages atomicity transactions concurrent programming Objective Caml

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Program Synthesis from Polymorphic Refinement Types

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acm sigplan NOTICES 2016年第6期51卷 522-538页

作者： Polikarpova, Nadia Kuraj, Ivan Solar-Lezama, Armando MIT CSAIL Cambridge MA USA

We present a method for synthesizing recursive functions that provably satisfy a given specification in the form of a polymorphic refinement type. We observe that such specifications are particularly suitable for program synthesis for two reasons. First, they offer a unique combination of expressive power and decidability, which enables automatic verification-and hence synthesis-of nontrivial programs. Second, a type-based specification for a program can often be effectively decomposed into independent specifications for its components, causing the synthesizer to consider fewer component combinations and leading to a combinatorial reduction in the size of the search space. At the core of our synthesis procedure is a newalgorithm for refinement type checking, which supports specification decomposition. We have evaluated our prototype implementation on a large set of synthesis problems and found that it exceeds the state of the art in terms of both scalability and usability. the tool was able to synthesize more complex programs than those reported in prior work (several sorting algorithms and operations on balanced search trees), as well as most of the benchmarks tackled by existing synthesizers, often starting from a more concise and intuitive user input.

关键词： languages Verification Program Synthesis Functional programming Refinement Types Predicate Abstraction

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Higher-Order and Tuple-Based Massively-Parallel Prefix Sums

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acm sigplan NOTICES 2016年第6期51卷 539-552页

作者： Maleki, Sepideh Yang, Annie Burtscher, Martin Texas State Univ Dept Comp Sci San Marcos TX 78666 USA

Prefix sums are an important parallel primitive, especially in massively-parallel programs. this paper discusses two orthogonal generalizations thereof, which we call higher-order and tuple-based prefix sums. Moreover, it describes and evaluates SAM, a GPU-friendly algorithm for computing prefix sums and other scans that directly supports higher orders and tuple values. Its templated CUDA implementation unifies all of these computations in a single 100-statement kernel. SAM is communication-efficient in the sense that it minimizes main-memory accesses. When computing prefix sums of a million or more values, it outperforms thrust and CUDPP on both a Titan X and a K40 GPU. On the Titan X, SAM reaches memory-copy speeds for large input sizes, which cannot be surpassed. SAM outperforms CUB, the currently fastest conventional prefix sum implementation, by up to a factor of 2.9 on eighth-order prefix sums and by up to a factor of 2.6 on eight-tuple prefix sums.

关键词： Algorithms Performance design Higher-order prefix sums tuple-based prefix sums carry propagation GPU programming

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Session details: language design 13

Session details: Language design

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Proceedings of the 34th acm sigplan conference on programming language design and implementation

作者： Umut A. Acar Carnegie Mellon University

No abstract available.

ISBN: (纸本)9781450320146

No abstract available.

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Session details: Probabilistic programming 14

Session details: Probabilistic programming

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Proceedings of the 35th acm sigplan conference on programming language design and implementation

作者： Ben Zorn Microsoft Research

No abstract available.

ISBN: (纸本)9781450327848

No abstract available.

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