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检索条件"任意字段=ACM SIGPLAN 96 Conference on Programming Language Design and Implementation"

共 903 条记录，以下是231-240 订阅

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Improving JavaScript Performance by Deconstructing the Type System 14

Improving JavaScript Performance by Deconstructing the Type ...

引用

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

作者： Ahn, Wonsun Choi, Jiho Shull, Thomas Garzaran, Maria J. Torrellas, Josep Univ Illinois Champaign IL 61820 USA

ISBN: (纸本)9781450327848

Increased focus on Java Script performance has resulted in vast performance improvements for many benchmarks. However, for actual code used in websites, the attained improvements often lag far behind those for popular benchmarks. This paper shows that the main reason behind this shortfall is how the compiler understands types. Java Script has no concept of types, but the compiler assigns types to objects anyway for ease of code generation. We examine the way that the Chrome V8 compiler defines types, and identify two design decisions that are the main reasons for the lack of improvement: (1) the inherited prototype object is part of the current object's type definition, and (2) method bindings are also part of the type definition. These requirements make types very unpredictable, which hinders type specialization by the compiler. Hence, we modify V8 to remove these requirements, and use it to compile the Java Script code assembled by JSBench from real websites. On average, we reduce the execution time of JSBench by 36%, and the dynamic instruction count by 49%.

关键词： design languages Performance Java Script Scripting language Dynamic Typing Type Specialization Hidden Class Inline Caching Prototype

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Globally Precise-restartable Execution of Parallel Programs 14

Globally Precise-restartable Execution of Parallel Programs

引用

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

作者： Gupta, Gagan Sridharan, Srinath Sohi, Gurindar S. Univ Wisconsin Madison WI 53706 USA

ISBN: (纸本)9781450327848

Emerging trends in computer design and use are likely to make exceptions, once rare, the norm, especially as the system size grows. Due to exceptions, arising from hardware faults, approximate computing, dynamic resource management, etc., successful and error-free execution of programs may no longer be assured. Yet, designers will want to tolerate the exceptions so that the programs execute completely, efficiently and without external intervention. Modern computers easily handle exceptions in sequential programs, using precise interrupts. But they are ill-equipped to handle exceptions in parallel programs, which are growing in prevalence. In this work we introduce the notion of globally precise-restartable execution of parallel programs, analogous to precise-interruptible execution of sequential programs. We present a software runtime recovery system based on the approach to handle exceptions in suitably-written parallel programs. Qualitative and quantitative analyses show that the proposed system scales with the system size, especially when exceptions are frequent, unlike the conventional checkpoint-and-recovery method.

关键词： design Experimentation Measurement Performance Reliability Deterministic Multithreading Precise Exceptions

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Test-Driven Synthesis 14

Test-Driven Synthesis

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

作者： Perelman, Daniel Gulwani, Sumit Grossman, Dan Provost, Peter Univ Washington Seattle WA 98195 USA Microsoft Corp Mountain View CA USA

ISBN: (纸本)9781450327848

programming-by-example technologies empower end-users to create simple programs merely by providing input/output examples. Existing systems are designed around solvers specialized for a specific set of data types or domain-specific language (DSL). We present a program synthesizer which can be parameterized by an arbitrary DSL that may contain conditionals and loops and therefore is able to synthesize programs in any domain. In order to use our synthesizer, the user provides a sequence of increasingly sophisticated input/output examples along with an expert-written DSL definition. These two inputs correspond to the two key ideas that allow our synthesizer to work in arbitrary domains. First, we developed a novel iterative synthesis technique inspired by test-driven development-which also gives our technique the name of test-driven synthesis-where the input/output examples are consumed one at a time as the program is refined. Second, the DSL allows our system to take an efficient component-based approach to enumerating possible programs. We present applications of our synthesis methodology to end-user programming for transformations over strings, XML, and table layouts. We compare our synthesizer on these applications to state-of-the-art DSL-specific synthesizers as well to the general purpose synthesizer Sketch.

关键词： languages Experimentation program synthesis end-user programming test driven development

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Lem: Reusable Engineering of Real-world Semantics 14

Lem: Reusable Engineering of Real-world Semantics

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19th acm sigplan International conference on Functional programming (ICFP)

作者： Mulligan, Dominic P. Owens, Scott Gray, Kathryn E. Ridge, Tom Sewell, Peter Univ Cambridge Cambridge England Univ Kent Canterbury CT2 7NZ Kent England Univ Leicester Leicester Leics England

ISBN: (纸本)9781450328739

Recent years have seen remarkable successes in rigorous engineering: using mathematically rigorous semantic models (not just idealised calculi) of real-world processors, programming languages, protocols, and security mechanisms, for testing, proof, analysis, and design. Building these models is challenging, requiring experimentation, dialogue with vendors or standards bodies, and validation;their scale adds engineering issues akin to those of programming to the task of writing clear and usable mathematics. But language and tool support for specification is lacking. Proof assistants can be used but bring their own difficulties, and a model produced in one, perhaps requiring many person-years effort and maintained over an extended period, cannot be used by those familiar with another. We introduce Lem, a language for engineering reusable largescale semantic models. The Lem design takes inspiration both from functional programming languages and from proof assistants, and Lem definitions are translatable into OCaml for testing, Coq, HOL4, and Isabelle/ HOL for proof, and LaTeX and HTML for presentation. This requires a delicate balance of expressiveness, careful library design, and implementation of transformations - akin to compilation, but subject to the constraint of producing usable and human-readable code for each target. Lem's effectiveness is demonstrated by its use in practice.

关键词： Lem real-world semantics specification language proof assistants

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Distributed REScala: An Update Algorithm for Distributed Reactive programming 14

Distributed REScala: An Update Algorithm for Distributed Rea...

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2014 acm International conference on Object-Oriented-programming-Systems-languages-and-Applications (OOPSLA 14)

作者： Drechsler, Joscha Salvaneschi, Guido Mogk, Ragnar Mezini, Mira Tech Univ Darmstadt Darmstadt Germany Univ Lancaster Lancaster LA1 4YW England

ISBN: (纸本)9781450325851

Reactive programming improves the design of reactive applications by relocating the logic for managing dependencies between dependent values away from the application logic to the language implementation. Many distributed applications are reactive. Yet, existing change propagation algorithms are not suitable in a distributed setting. We propose Distributed REScala, a reactive language with a change propagation algorithm that works without centralized knowledge about the topology of the dependency structure among reactive values and avoids unnecessary propagation of changes, while retaining safety guarantees (glitch freedom). Distributed REScala enables distributed reactive programming, bringing the benefits of reactive programming to distributed applications. We demonstrate the enabled design improvements by a case study. We also empirically evaluate the performance of our algorithm in comparison to other algorithms in a simulated distributed setting.

关键词： Reactive programming Scala Distributed programming

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Expressing and Verifying Probabilistic Assertions 14

Expressing and Verifying Probabilistic Assertions

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

作者： Sampson, Adrian Panchekha, Pavel Mytkowicz, Todd McKinley, Kathryn S. Grossman, Dan Ceze, Luis Univ Washington Seattle WA 98195 USA

ISBN: (纸本)9781450327848

Traditional assertions express correctness properties that must hold on every program execution. However, many applications have probabilistic outcomes and consequently their correctness properties are also probabilistic (e. g., they identify faces in images, consume sensor data, or run on unreliable hardware). Traditional assertions do not capture these correctness properties. This paper proposes that programmers express probabilistic correctness properties with probabilistic assertions and describes a new probabilistic evaluation approach to efficiently verify these assertions. Probabilistic assertions are Boolean expressions that express the probability that a property will be true in a given execution rather than asserting that the property must always be true. Given either specific inputs or distributions on the input space, probabilistic evaluation verifies probabilistic assertions by first performing distribution extraction to represent the program as a Bayesian network. Probabilistic evaluation then uses statistical properties to simplify this representation to efficiently compute assertion probabilities directly or with sampling. Our approach is a mix of both static and dynamic analysis: distribution extraction statically builds and optimizes the Bayesian network representation and sampling dynamically interprets this representation. We implement our approach in a tool called MAYHAP for C and C++ programs. We evaluate expressiveness, correctness, and performance of MAYHAP on programs that use sensors, perform approximate computation, and obfuscate data for privacy. Our case studies demonstrate that probabilistic assertions describe useful correctness properties and that MAYHAP efficiently verifies them.

关键词： languages Reliability Probabilistic programming approximate computing data obfuscation differential privacy sensors symbolic execution

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Slicing Probabilistic Programs 14

Slicing Probabilistic Programs

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

作者： Hur, Chung-Kil Nori, Aditya V. Rajamani, Sriram K. Samuel, Selva Seoul Natl Univ Seoul 151 South Korea

ISBN: (纸本)9781450327848

Probabilistic programs use familiar notation of programming languages to specify probabilistic models. Suppose we are interested in estimating the distribution of the return expression r of a probabilistic program P. We are interested in slicing the probabilistic program P and obtaining a simpler program SLI (P) which retains only those parts of P that are relevant to estimating r, and elides those parts of P that are not relevant to estimating r. We desire that the SLI transformation be both correct and efficient. By correct, we mean that P and SLI (P) have identical estimates on r. By efficient, we mean that estimation over SLI (P) be as fast as possible. We show that the usual notion of program slicing, which traverses control and data dependencies backward from the return expression r, is unsatisfactory for probabilistic programs, since it produces incorrect slices on some programs and sub-optimal ones on others. Our key insight is that in addition to the usual notions of control dependence and data dependence that are used to slice non-probabilistic programs, a new kind of dependence called observe dependence arises naturally due to observe statements in probabilistic programs. We propose a new definition of SLI (P) which is both correct and efficient for probabilistic programs, by including observe dependence in addition to control and data dependences for computing slices. We prove correctness mathematically, and we demonstrate efficiency empirically. We show that by applying the SLI transformation as a pre-pass, we can improve the efficiency of probabilistic inference, not only in our own inference tool R2, but also in other systems for performing inference such as Church and Infer. NET.

关键词： Probabilistic programming Program Slicing Bayesian Reasoning

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Maximal Sound Predictive Race Detection with Control Flow Abstraction 14

Maximal Sound Predictive Race Detection with Control Flow Ab...

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

作者： Huang, Jeff Meredith, Patrick O'Neil Rosu, Grigore Univ Illinois Dept Comp Sci Urbana IL 61801 USA

ISBN: (纸本)9781450327848

Despite the numerous static and dynamic program analysis techniques in the literature, data races remain one of the most common bugs in modern concurrent software. Further, the techniques that do exist either have limited detection capability or are unsound, meaning that they report false positives. We present a sound race detection technique that achieves a provably higher detection capability than existing sound techniques. A key insight of our technique is the inclusion of abstracted control flow information into the execution model, which increases the space of the causal model permitted by classical happens-before or causally-precedes based detectors. By encoding the control flow and a minimal set of feasibility constraints as a group of first-order logic formulae, we formulate race detection as a constraint solving problem. Moreover, we formally prove that our formulation achieves the maximal possible detection capability for any sound dynamic race detector with respect to the same input trace under the sequential consistency memory model. We demonstrate via extensive experimentation that our technique detects more races than the other state-of-the-art sound race detection techniques, and that it is scalable to executions of real world concurrent applications with tens of millions of critical events. These experiments also revealed several previously unknown races in real systems (e. g., Eclipse) that have been confirmed or fixed by the developers. Our tool is also adopted by Eclipse developers.

关键词： Algorithms design Theory Maximal Sound Data Race Prediction Control Flow

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Typed Lua: An optional type system for Lua

Typed Lua: An optional type system for Lua

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8th Workshop on Dynamic languages and Applications, Dyla 2014, with PLDI 2014

作者： Maidl, André Murbach Mascarenhas, Fabio Ierusalimschy, Roberto PUC-Rio Rio de Janeiro Brazil UFRJ Rio de Janeiro Brazil

ISBN: (纸本)9781450329163

Dynamically typed languages trade flexibility and ease of use for safety, while statically typed languages prioritize the early detection of bugs, and provide a better framework for structure large programs. The idea of optional typing is to combine the two approaches in the same language: the programmer can begin development with dynamic types, and migrate to static types as the program matures. The challenge is designing a type system that feels natural to the programmer that is used to programming in a dynamic language. This paper presents the initial design of Typed Lua, an optionally-typed extension of the Lua scripting language. Lua is an imperative scripting language with first class functions and lightweight metaprogramming mechanisms. The design of Typed Lua's type system has a novel combination of features that preserves some of the idioms that Lua programmers are used to, while bringing static type safety to them. We show how the major features of the type system type these idioms with some examples, and discuss some of the design issues we faced. © 2014 acm.

关键词： gradual typing Lua programming language optional typing type systems

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Compiling a subset of apl into a typed intermediate language∗ 1

Compiling a subset of apl into a typed intermediate language...

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1st acm sigplan International Workshop on Libraries, languages and Compilers for Array programming, ARRAY 2014 - Part of PLDI 2014

作者： Elsman, Martin Dybdal, Martin Department of Computer Science University of Copenhagen Denmark

ISBN: (纸本)9781450329378

We present a compiler and a typed intermediate language for a subset of APL. The intermediate language treats all numeric data as multi-dimensional arrays and the type system makes explicit the ranks of arrays. Primitive operators are polymorphic in rank and in the type of the underlying data operated on. The frontend of the APL compiler deals with much of the gory details of the APL language, including infix resolution, resolution of identity items for reduce operations, resolution of default element values for empty arrays, scalar extensions, and resolution of certain kinds of overloading. We demonstrate the usefulness of the intermediate language by showing that it can be compiled efficiently, using known techniques, such as delayed arrays, into a C-like language. We also demonstrate that the language is sufficiently expressive that some primitive operators, such as APL's inner product operator, which works on arrays of arbitrary dimensions, can be compiled using more primitive operators.. Copyright © 2014 acm 978-1-4503-2937-8/14/06. 15.00.

关键词： Calculations

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