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检索条件"任意字段=Proceedings of the 27th ACM SIGPLAN Conference on Programming Language Design and Implementation"

共 268 条记录，以下是71-80 订阅

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RaTrace: Simple and Efficient Abstractions for BVH Ray Traversal Algorithms 2017

RaTrace: Simple and Efficient Abstractions for BVH Ray Trave...

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16th acm sigplan International conference on Generative programming - Concepts and Experiences (GPCE) co-located with SPLASH conference

作者： Perard-Gayot, Arsene Weier, Martin Membarth, Richard Slusallek, Philipp Leissa, Roland Hack, Sebastian Saarland Univ Comp Graph Lab Saarbrucken Germany Bonn Rhein Sieg Univ Inst Visual Comp St Augustin Germany DFKI Agents & Simulated Real Saarbrucken Germany Saarland Univ Compiler Design Lab Saarbrucken Germany

ISBN: (纸本)9781450355247

In order to achieve the highest possible performance, the ray traversal and intersection routines at the core of every high-performance ray tracer are usually hand-coded, heavily optimized, and implemented separately for each hardware platform-even though they share most of their algorithmic core. the results are implementations that heavily mix algorithmic aspects with hardware and implementation details, making the code non-portable and difficult to change and maintain. In this paper, we present a new approach that offers the ability to define in a functional language a set of conceptual, high-level language abstractions that are optimized away by a special compiler in order to maximize performance. Using this abstraction mechanism we separate a generic ray traversal and intersection algorithm from its low-level aspects that are specific to the target hardware. We demonstrate that our code is not only significantly more flexible, simpler to write, and more concise but also that the compiled results perform as well as state-of-the-art implementations on any of the tested CPU and GPU platforms.

关键词： Computer Graphics Ray Tracing Functional programming Domain-Specific languages

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Composable and compilable macros -: You want it when?

Composable and compilable macros -: You want it <i>when</i>?

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7th International conference on Functional programming

作者： Flatt, M Univ Utah Salt Lake City UT 84112 USA

Many macro systems, especially for Lisp and Scheme, allow macro transformers to perform general computation. Moreover, the language for implementing compile-time macro transformers is usually the same as the language for implementing run-time functions. As a side effect of this sharing, implementations tend to allow the mingling of compile-time values and rum-time values, as well as values from separate compilations. Such mingling breaks programming tools that must parse code without executing it. Macro implementors avoid harmful mingling by obeying certain macro-definition protocols and by inserting phase-distinguishing annotations into the code. However, the annotations are fragile, the protocols are not enforced, and programmers can only reason about the result in terms of the compiler's implementation. MzScheme-the language of the PLT Scheme tool suite-addresses the problem through a macro system that separates compilation without sacrificing the expressiveness of macros.

关键词： languages design macros modules language tower

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Dynamic Enforcement of Determinism in a Parallel Scripting language 14

Dynamic Enforcement of Determinism in a Parallel Scripting L...

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35th acm sigplan conference on programming language design and implementation (PLDI)

作者： Lu, Li Ji, Weixing Scott, Michael L. Univ Rochester Rochester NY 14627 USA Beijing Inst Technol Beijing Peoples R China

ISBN: (纸本)9781450327848

Determinism is an appealing property for parallel programs, as it simplifies understanding, reasoning and debugging. It is particularly appealing in dynamic (scripting) languages, where ease of programming is a dominant design goal. Some existing parallel languages use the type system to enforce determinism statically, but this is not generally practical for dynamic languages. In this paper, we describe how determinism can be obtained-and dynamically enforced/verified-for appropriate extensions to a parallel scripting language. Specifically, we introduce the constructs of Deterministic Parallel Ruby (DPR), together with a run-time system (TARDIS) that verifies properties required for determinism, including correct usage of reductions and commutative operators, and the mutual independence (data-race freedom) of concurrent tasks. Experimental results confirm that DPR can provide scalable performance on multicore machines and that the overhead of TARDIS is low enough for practical testing. In particular, TARDIS significantly outperforms alternative data-race detectors with comparable functionality. We conclude with a discussion of future directions in the dynamic enforcement of determinism.

关键词： design languages Reliability Determinism deterministic parallelism data races scripting language

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Stateless Model Checking Concurrent Programs with Maximal Causality Reduction 15

Stateless Model Checking Concurrent Programs with Maximal Ca...

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36th acm sigplan conference on programming language design and implementation

作者： Huang, Jeff Texas A&M Univ College Stn TX 77843 USA

ISBN: (纸本)9781450334686

We present maximal causality reduction (MCR), a new technique for stateless model checking. MCR systematically explores the state-space of concurrent programs with a provably minimal number of executions. Each execution corresponds to a distinct maximal causal model extracted from a given execution trace, which captures the largest possible set of causally equivalent executions. Moreover, MCR is embarrassingly parallel by shifting the runtime exploration cost to offline analysis. We have designed and implemented MCR using a constraint-based approach and compared with iterative context bounding (ICB) and dynamic partial order reduction (DPOR) on both benchmarks and real-world programs. MCR reduces the number of executions explored by ICB and ICB+DPOR by orders of magnitude, and significantly improves the scalability, efficiency, and effectiveness of the state-of-the-art for both state-space exploration and bug finding. In our experiments, MCR also revealed several new data races and null pointer dereference errors in frequently studied real-world programs.

关键词： Algorithms design theory Maximal Causality Reduction Model Checking

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A General Constraint-centric Scheduling Framework for Spatial Architectures

A General Constraint-centric Scheduling Framework for Spatia...

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34th acm sigplan conference on programming language design and implementation (PLDI)

作者： Nowatzki, Tony Sartin-Tarm, Michael De Carli, Lorenzo Sankaralingam, Karthikeyan Estan, Cristian Robatmili, Behnam Univ Wisconsin Madison WI 53706 USA

ISBN: (纸本)9781450320146

Specialized execution using spatial architectures provides energy efficient computation, but requires effective algorithms for spatially scheduling the computation. Generally, this has been solved with architecture-specific heuristics, an approach which suffers from poor compiler/architect productivity, lack of insight on optimality, and inhibits migration of techniques between architectures. Our goal is to develop a scheduling framework usable for all spatial architectures. To this end, we expresses spatial scheduling as a constraint satisfaction problem using Integer Linear programming (ILP). We observe that architecture primitives and scheduler responsibilities can be related through five abstractions: placement of computation, routing of data, managing event timing, managing resource utilization, and forming the optimization objectives. We encode these responsibilities as 20 general ILP constraints, which are used to create schedulers for the disparate TRIPS, DySER, and PLUG architectures. Our results show that a general declarative approach using ILP is implementable, practical, and typically matches or outperforms specialized schedulers.

关键词： Spatial Architectures Spatial Architecture Scheduling Integer Linear programming

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Automated Clustering and Program Repair for Introductory programming Assignments 2018

Automated Clustering and Program Repair for Introductory Pro...

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39th acm sigplan conference on programming language design and implementation (PLDI)

作者： Gulwani, Sumit Radicek, Ivan Zuleger, Florian Microsoft Corp Redmond WA 98052 USA TU Wien Vienna Austria

ISBN: (纸本)9781450356985

Providing feedback on programming assignments is a tedious task for the instructor, and even impossible in large Massive Open Online Courses with thousands of students. Previous research has suggested that program repair techniques can be used to generate feedback in programming education. In this paper, we present a novel fully automated program repair algorithm for introductory programming assignments. the key idea of the technique, which enables automation and scalability, is to use the existing correct student solutions to repair the incorrect attempts. We evaluate the approach in two experiments: (I) We evaluate the number, size and quality of the generated repairs on 4,293 incorrect student attempts from an existing MOOC. We find that our approach can repair 97% of student attempts, while 81% of those are small repairs of good quality. (II) We conduct a preliminary user study on performance and repair usefulness in an interactive teaching setting. We obtain promising initial results (the average usefulness grade 3.4 on a scale from 1 to 5), and conclude that our approach can be used in an interactive setting.

关键词： programming education MOOC dynamic analysis program repair clustering

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JavaGI in the Battlefield: Practical Experience with Generalized Interfaces 09

JavaGI in the Battlefield: Practical Experience with General...

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8th International conference on Generative programming and Component Engineering

作者： Wehr, Stefan thiemann, Peter Univ Freiburg D-7800 Freiburg Germany

ISBN: (纸本)9781605584942

Generalized interfaces are an extension of the interface concept found in object-oriented languages such as Java or C#. the extension is inspired by Haskell's type classes. It supports retroactive and type-conditional interface implementations, binary methods, symmetric multimethods, interfaces over families of types, and static interface methods. this article reports practical experience with generalized interfaces as implemented in the JavaGI language. Several real-world case studies demonstrate how generalized interfaces provide solutions to extension and integration problems with components in binary form, how they make certain design patterns redundant, and how they eliminate various run-time errors. In each case study, the use of JavaGI results in elegant and highly readable code. Furthermore, the article discusses the implementation of a compiler and a run-time system for JavaGI. Benchmarks show that our implementation offers acceptable performance.

关键词： design Experimentation languages JavaGI retroactive interface implementation external methods multimethods case studies

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Programmable Semantic Fragments the design and implementation of typy 2016

Programmable Semantic Fragments The Design and Implementatio...

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15th acm International conference on Generative programming - Concepts and Experiences (GPCE)

作者： Omar, Cyrus Aldrich, Jonathan Carnegie Mellon Univ Pittsburgh PA 15213 USA

ISBN: (纸本)9781450344463

this paper introduces typy, a statically typed programming language embedded by reflection into Python. typy features a fragmentary semantics, i.e. it delegates semantic control over each term, drawn from Python's fixed concrete and abstract syntax, to some contextually relevant user-defined semantic fragment. the delegated fragment programmatically 1) typechecks the term (following a bidirectional protocol);and 2) assigns dynamic meaning to the term by computing a translation to Python. We argue that this design is expressive with examples of fragments that express the static and dynamic semantics of 1) functional records;2) labeled sums (with nested pattern matching a la ML);3) a variation on JavaScript's prototypal object system;and 4) typed foreign interfaces to Python and OpenCL. these semantic structures are, or would need to be, defined primitively in conventionally structured languages. We further argue that this design is compositionally well-behaved. It avoids the expression problem and the problems of grammar composition because the syntax is fixed. Moreover, programs are semantically stable under fragment composition (i.e. defining a new fragment will not change the meaning of existing program components.)

关键词： metaprogramming bidirectional typechecking pattern matching foreign function interfaces

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FAST: a Transducer-Based language for Tree Manipulation 14

FAST: a Transducer-Based Language for Tree Manipulation

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35th acm sigplan conference on programming language design and implementation (PLDI)

作者： D'Antoni, Loris Veanes, Margus Livshits, Benjamin Molnar, David Univ Penn Philadelphia PA 19104 USA

ISBN: (纸本)9781450327848

Tree automata and tree transducers are used in a wide range of applications in software engineering, from XML processing to language type-checking. While these formalisms are of immense practical use, they can only model finite alphabets, and since many real-world applications operate over in finite domains such as integers, this is often a limitation. To overcome this problem we augment tree automata and transducers with symbolic alphabets represented as parametric theories. Admitting in finite alphabets makes these models more general and succinct than their classical counterparts. Despite this, we show how the main operations, such as composition and language equivalence, remain computable given a decision procedure for the alphabet theory. We introduce a high-level language called Fast that acts as a front-end for the above formalisms. Fast supports symbolic alphabets through tight integration with state-of-the art satisfiability modulo theory (SMT) solvers. We demonstrate our techniques on practical case studies, covering a wide range of applications.

关键词： Symbolic Tree Transducers FAST

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FlashExtract: A Framework for Data Extraction by Examples 14

FlashExtract: A Framework for Data Extraction by Examples

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35th acm sigplan conference on programming language design and implementation (PLDI)

作者： Le, Vu Gulwani, Sumit Univ Calif Davis Davis CA 95616 USA Microsoft Res Redmond Redmond WA USA

ISBN: (纸本)9781450327848

Various document types that combine model and view (e. g., text files, webpages, spreadsheets) make it easy to organize (possibly hierarchical) data, but make it difficult to extract raw data for any further manipulation or querying. We present a general framework FlashExtract to extract relevant data from semi-structured documents using examples. It includes: (a) an interaction model that allows end-users to give examples to extract various fields and to relate them in a hierarchical organization using structure and sequence constructs. (b) an inductive synthesis algorithm to synthesize the intended program from few examples in any underlying domain-specific language for data extraction that has been built using our specified algebra of few core operators (map, filter, merge, and pair). We describe instantiation of our framework to three different domains: text files, webpages, and spreadsheets. On our benchmark comprising 75 documents, FlashExtract is able to extract intended data using an average of 2.36 examples in 0.84 seconds per field.

关键词： languages Algorithms Human Factors Program Synthesis End-user programming programming by Examples

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