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检索条件"任意字段=37th ACM SIGPLAN Conference on Programming Language Design and Implementation"

共 318 条记录，以下是61-70 订阅

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Achieving High Coverage for Floating-Point Code via Unconstrained programming 2017

Achieving High Coverage for Floating-Point Code via Unconstr...

引用

38th acm sigplan conference on programming language design and implementation (PLDI)

作者： Fu, Zhoulai Su, Zhendong Univ Calif Davis Davis CA 95616 USA

ISBN: (纸本)9781450349888

Achieving high code coverage is essential in testing, which gives us confidence in code quality. Testing floating-point code usually requires painstaking efforts in handling floating-point constraints, e.g., in symbolic execution. this paper turns the challenge of testing floating-point code into the opportunity of applying unconstrained programming-the mathematical solution for calculating function minimum points over the entire search space. Our core insight is to derive a representing function from the floating-point program, any of whose minimum points is a test input guaranteed to exercise a new branch of the tested program. this guarantee allows us to achieve high coverage of the floating-point program by repeatedly minimizing the representing function. We have realized this approach in a tool called CoverMe and conducted an extensive evaluation of it on Sun's C math library. Our evaluation results show that CoverMe achieves, on average, 90.8% branch coverage in 6.9 seconds, drastically outperforming our compared tools: (1) Random testing, (2) AFL, a highly optimized, robust fuzzer released by Google, and (3) Austin, a state-of-the-art coverage-based testing tool designed to support floating-point code.

关键词： Unconstrained programming Representing Function CoverMe

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Asynchronous programming, analysis and testing with state machines 15

Asynchronous programming, analysis and testing with state ma...

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Proceedings of the 36th acm sigplan conference on programming language design and implementation

作者： Deligiannis, Pantazis Donaldson, Alastair F. Ketema, Jeroen Lal, Akash thomson, Paul Imperial College London United Kingdom Microsoft Research India

ISBN: (纸本)9781450334686

programming efficient asynchronous systems is challenging because it can often be hard to express the design declaratively, or to defend against data races and interleaving-dependent assertion violations. Previous work has only addressed these challenges in isolation, by either designing a new declarative language, a new data race detection tool or a new testing technique. We present P#, a language for high-reliability asynchronous programming co-designed with a static data race analysis and systematic concurrency testing infrastructure. We describe our experience using P# to write several distributed protocols and port an industrial-scale system internal to Microsoft, showing that the combined techniques, by leveraging the design of P#, are effective in finding bugs. © 2015 acm.

关键词： Testing

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Gen: A General-Purpose Probabilistic programming System with Programmable Inference 2019

Gen: A General-Purpose Probabilistic Programming System with...

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40th acm sigplan conference on programming language design and implementation (PLDI) part of acm's Federated Computing Research conference (FCRC)

作者： Cusumano-Towner, Marco F. Saad, Feras A. Lew, Alexander K. Mansinghka, Vikash K. MIT Cambridge MA 02139 USA

ISBN: (纸本)9781450367127

Although probabilistic programming is widely used for some restricted classes of statistical models, existing systems lack the flexibility and efficiency needed for practical use with more challenging models arising in fields like computer vision and robotics. this paper introduces Gen, a generalpurpose probabilistic programming system that achieves modeling flexibility and inference efficiency via several novel language constructs: (i) the generative function interface for encapsulating probabilistic models;(ii) interoperable modeling languages that strike different flexibility/efficiency tradeoffs;(iii) combinators that exploit common patterns of conditional independence;and (iv) an inference library that empowers users to implement efficient inference algorithms at a high level of abstraction. We show that Gen outperforms state-of-the-art probabilistic programming systems, sometimes by multiple orders of magnitude, on diverse problems including object tracking, estimating 3D body pose from a depth image, and inferring the structure of a time series.

关键词： Probabilistic programming Markov chain Monte Carlo sequential Monte Carlo variational inference

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Reusable Inline Caching for JavaScript Performance 2019

Reusable Inline Caching for JavaScript Performance

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40th acm sigplan conference on programming language design and implementation (PLDI) part of acm's Federated Computing Research conference (FCRC)

作者： Choi, Jiho Shull, thomas Torrellas, Josep Univ Illinois Champaign IL 61820 USA

ISBN: (纸本)9781450367127

JavaScript performance is paramount to a user's browsing experience. Browser vendors have gone to great lengths to improve JavaScript's steady-state performance. this has led to sophisticated web applications. However, as users increasingly expect instantaneous page load times, another important goal for JavaScript engines is to attain minimal startup times. In this paper, we reduce the startup time of JavaScript programs by enhancing the reuse of compilation and optimization information across different executions. Specifically, we propose a new scheme to increase the startup performance of Inline Caching (IC), a key optimization for dynamic type systems. the idea is to represent a substantial portion of the IC information in an execution in a context-independent way, and reuse it in subsequent executions. We call our enhanced IC design Reusable Inline Caching (RIC). We integrate RIC into the state-of-the-art Google V8 JavaScript engine and measure its impact on the initialization time of popular JavaScript libraries. By recycling IC information collected from a previous execution, RIC reduces the average initialization time per library by 17%.

关键词： Inline Caching JavaScript Scripting language Dynamic Typing

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Component-Based Synthesis of Table Consolidation and Transformation Tasks from Examples 2017

Component-Based Synthesis of Table Consolidation and Transfo...

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38th acm sigplan conference on programming language design and implementation (PLDI)

作者： Feng, Yu Martins, Ruben Van Geffen, Jacob Dillig, Isil Chaudhuri, Swarat Univ Texas Austin Austin TX 78712 USA Rice Univ Houston TX 77251 USA

ISBN: (纸本)9781450349888

this paper presents a novel component-based synthesis algorithm that marries the power of type-directed search with lightweight SMT-based deduction and partial evaluation. Given a set of components together with their over-approximate first-order specifications, our method first generates a program sketch over a subset of the components and checks its feasibility using an SMT solver. Since a program sketch typically represents many concrete programs, the use of SMT-based deduction greatly increases the scalability of the algorithm. Once a feasible program sketch is found, our algorithm completes the sketch in a bottom-up fashion, using partial evaluation to further increase the power of deduction for rejecting partially-filled program sketches. We apply the proposed synthesis methodology for automating a large class of data preparation tasks that commonly arise in data science. We have evaluated our synthesis algorithm on dozens of data wrangling and consolidation tasks obtained from on-line forums, and we show that our approach can automatically solve a large class of problems encountered by R users.

关键词： Program synthesis programming by example data preparation Component-based synthesis SMT-based deduction

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Defining the Undefinedness of C 15

Defining the Undefinedness of C

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36th acm sigplan conference on programming language design and implementation

作者： Hathhorn, Chris Ellison, Chucky Rosu, Grigore Univ Missouri Columbia MO 65211 USA Univ Illinois Urbana IL 61801 USA

ISBN: (纸本)9781450334686

We present a "negative" semantics of the C11 language-a semantics that does not just give meaning to correct programs, but also rejects undefined programs. We investigate undefined behavior in C and discuss the techniques and special considerations needed for formally specifying it. We have used these techniques to modify and extend a semantics of C into one that captures undefined behavior. the amount of semantic infrastructure and effort required to achieve this was unexpectedly high, in the end nearly doubling the size of the original semantics. From our semantics, we have automatically extracted an undefinedness checker, which we evaluate against other popular analysis tools, using our own test suite in addition to a third-party test suite. Our checker is capable of detecting examples of all 77 categories of core language undefinedness appearing in the C11 standard, more than any other tool we considered. Based on this evaluation, we argue that our work is the most comprehensive and complete semantic treatment of undefined behavior in C, and thus of the C language itself.

关键词： Undefined behavior programming language semantics C11 K Framework

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First-class Runtime Generation of High-performance Types using Exotypes 14

First-class Runtime Generation of High-performance Types usi...

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

作者： DeVito, Zachary Ritchie, Daniel Fisher, Matt Aiken, Alex Hanrahan, Pat Stanford Univ Stanford CA 94305 USA

ISBN: (纸本)9781450327848

We introduce exotypes, user-defined types that combine the flexibility of meta-object protocols in dynamically-typed languages with the performance control of low-level languages. Like objects in dynamic languages, exotypes are defined programmatically at runtime, allowing behavior based on external data such as a database schema. To achieve high performance, we use staged programming to define the behavior of an exotype during a runtime compilation step and implement exotypes in Terra, a low-level staged programming language. We show how exotype constructors compose, and use exotypes to implement high-performance libraries for serialization, dynamic assembly, automatic differentiation, and probabilistic programming. Each exotype achieves expressiveness similar to libraries written in dynamically-typed languages but implements optimizations that exceed the performance of existing libraries written in low-level statically-typed languages. though each implementation is significantly shorter, our serialization library is 11 times faster than Kryo, and our dynamic assembler is 3-20 times faster than Google's Chrome assembler.

关键词： design Performance Lua Staged computation DSL

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A Lightweight Symbolic Virtual Machine for Solver-Aided Host languages 14

A Lightweight Symbolic Virtual Machine for Solver-Aided Host...

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

作者： Torlak, Emina Bodik, Rastislav Univ Calif Berkeley Berkeley CA 94608 USA

ISBN: (纸本)9781450327848

Solver-aided domain-specific languages (SDSLs) are an emerging class of computer-aided programming systems. they ease the construction of programs by using satisfiability solvers to automate tasks such as verification, debugging, synthesis, and non-deterministic execution. But reducing programming tasks to satisfiability problems involves translating programs to logical constraints, which is an engineering challenge even for domain-specific languages. We have previously shown that translation to constraints can be avoided if SDSLs are implemented by (traditional) embedding into a host language that is itself solver-aided. this paper describes how to implement a symbolic virtual machine (SVM) for such a host language. Our symbolic virtual machine is lightweight because it compiles to constraints only a small subset of the host's constructs, while allowing SDSL designers to use the entire language, including constructs for DSL embedding. this lightweight compilation employs a novel symbolic execution technique with two key properties: it produces compact encodings, and it enables concrete evaluation to strip away host constructs that are outside the subset compilable to constraints. Our symbolic virtual machine architecture is at the heart of ROSETTE, a solver-aided language that is host to several new SDSLs.

关键词： design languages Solver-Aided languages Symbolic Virtual Machine

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Interactive Parser Synthesis by Example 15

Interactive Parser Synthesis by Example

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36th acm sigplan conference on programming language design and implementation

作者： Leung, Alan Sarracino, John Lerner, Sorin Univ Calif San Diego San Diego CA 92103 USA

ISBN: (纸本)9781450334686

Despite decades of research on parsing, the construction of parsers remains a painstaking, manual process prone to subtle bugs and pitfalls. We present a programming-by-example framework called Parsify that is able to synthesize a parser from input/output examples. the user does not write a single line of code. To achieve this, Parsify provides: (a) an iterative algorithm for synthesizing and refining a grammar one example at a time, (b) an interface that provides immediate visual feedback in response to changes in the grammar being refined, and (c) a graphical mechanism for specifying example parse trees using only textual selections. We empirically demonstrate the viability of our approach by using Parsify to construct parsers for source code drawn from Verilog, SQL, Apache, and Tiger.

关键词： Algorithms Human Factors languages Parsing programming by Example Program Synthesis

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An Applied Quantum Hoare Logic 2019

An Applied Quantum Hoare Logic

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40th acm sigplan conference on programming language design and implementation (PLDI) part of acm's Federated Computing Research conference (FCRC)

作者： Zhou, Li Yu, Nengkun Ying, Mingsheng Tsinghua Univ Dept Comp Sci & Technol Beijing Peoples R China Univ Technol Sydney CQSI FEIT Sydney NSW Australia Chinese Acad Sci Inst Software Beijing Peoples R China Tsinghua Univ Beijing Peoples R China

ISBN: (纸本)9781450367127

We derive a variant of quantum Hoare logic (QHL), called applied quantum Hoare logic (aQHL for short), by: (1) restricting QHL to a special class of preconditions and postconditions, namely projections, which can significantly simplify verification of quantum programs and are much more convenient when used in debugging and testing;and (2) adding several rules for reasoning about robustness of quantum programs, i.e. error bounds of outputs. the effectiveness of aQHL is shown by its applications to verify two sophisticated quantum algorithms: HHL (Harrow-Hassidim-Lloyd) for solving systems of linear equations and qPCA (quantum Principal Component Analysis).

关键词： Quantum computation programming languages Hoare logic projections robustness

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