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检索条件"任意字段=Proceedings of the ACM Sigplan 2003 Conference on Programming Language Design and Implementation"

共 1287 条记录，以下是461-470 订阅

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Visualization Question Answering using Introspective Program Synthesis 2022

Visualization Question Answering using Introspective Program...

引用

43rd acm sigplan International conference on programming language design and implementation (PLDI)

作者： Chen, Yanju Yan, Xifeng Feng, Yu Univ Calif Santa Barbara Dept Comp Sci Santa Barbara CA 93106 USA

ISBN: (纸本)9781450392655

While data visualization plays a crucial role in gaining insights from data, generating answers over complex visualizations from natural language questions is far from an easy task. Mainstream approaches reduce data visualization queries to a semantic parsing problem, which either relies on expensive-to-annotate supervised training data that pairs natural language questions with logical forms, or weakly supervised models that incorporate a larger corpus but fail on long-tailed queries without explanations. This paper aims to answer data visualization queries by automatically synthesizing the corresponding program from natural language. At the core of our technique is an abstract synthesis engine that is bootstrapped by an off-the-shelf weakly supervised model and an optimal synthesis algorithm guided by triangle alignment constraints, which represent consistency among natural language, visualization, and the synthesized program. Starting with a few tentative answers obtained from an off-the-shelf statistical model, our approach first involves an abstract synthesizer that generates a set of sketches that are consistent with the answers. Then we design an instance of optimal synthesis to complete one of the candidate sketches by satisfying common type constraints and maximizing the consistency among three parties, i.e., natural language, the visualization, and the candidate program. We implement the proposed idea in a system called POE that can answer visualization queries from natural language. Our method is fully automated and does not require users to know the underlying schema of the visualizations. We evaluate POE on 629 visualization queries and our experiment shows that Poe outperforms state-of-the-arts by improving the accuracy from 44% to 59%.

关键词： Program Synthesis Visualization Machine Learning Natural language Processing

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signatr: A Data-Driven Fuzzing Tool for R 15

signatr: A Data-Driven Fuzzing Tool for R

引用

15th International conference on Software language Engineering (SLE)

作者： Turcotte, Alexi Donat-Bouillud, Pierre Krikava, Filip Vitek, Jan Northeastern Univ Boston MA 02115 USA Czech Tech Univ Prague Czech Republic

ISBN: (纸本)9781450399197

The fast-and-loose, permissive semantics of dynamic programming languages limit the power of static analyses. For that reason, soundness is often traded for precision through dynamic program analysis. Dynamic analysis is only as good as the available runnable code, and relying solely on test suites is fraught as they do not cover the full gamut of possible behaviors. Fuzzing is an approach for automatically exercising code, and could be used to obtain more runnable code. However, the shape of user-defined data in dynamic languages is difficult to intuit, limiting a fuzzer's reach. We propose a feedback-driven blackbox fuzzing approach which draws inputs from a database of values recorded from existing code. We implement this approach in a tool called signatr for the R language. We present the insights of its design and implementation, and assess signatr's ability to uncover new behaviors by fuzzing 4,829 R functions from 100 R packages, revealing 1,195,184 new signatures.

关键词： R fuzzing dynamic program analysis dynamic programming languages

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CLAP: Recording Local Executions to Reproduce Concurrency Failures

CLAP: Recording Local Executions to Reproduce Concurrency Fa...

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

作者： Huang, Jeff Zhang, Charles Dolby, Julian Hong Kong Univ Sci & Technol Hong Kong Hong Kong Peoples R China

ISBN: (纸本)9781450320146

We present CLAP, a new technique to reproduce concurrency bugs. CLAP has two key steps. First, it logs thread local execution paths at runtime. Second, offline, it computes memory dependencies that accord with the logged execution and are able to reproduce the observed bug. The second step works by combining constraints from the thread paths and constraints based on a memory model, and computing an execution with a constraint solver. CLAP has four major advantages. First, logging purely local execution of each thread is substantially cheaper than logging memory interactions, which enables CLAP to be efficient compared to previous approaches. Second, our logging does not require any synchronization and hence with no added memory barriers or fences;this minimizes perturbation and missed bugs due to extra synchronizations foreclosing certain racy behaviors. Third, since it uses no synchronization, we extend CLAP to work on a range of relaxed memory models, such as TSO and PSO, in addition to sequential consistency. Fourth, CLAP can compute a much simpler execution than the original one, that reveals the bug with minimal thread context switches. To mitigate the scalability issues, we also present an approach to parallelize constraint solving, which theoretically scales our technique to programs with arbitrary execution length. Experimental results on a variety of multithreaded benchmarks and real world concurrent applications validate these advantages by showing that our technique is effective in reproducing concurrency bugs even under relaxed memory models;furthermore, it is significantly more efficient than a state-of-the-art technique that records shared memory dependencies, reducing execution time overhead by 45% and log size by 88% on average.

关键词： Algorithms design Performance Theory Concurrency Bug Reproduction Local Execution Constraint Solving

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The design and implementation of the Habanero-Java parallel programming language

The design and implementation of the Habanero-Java parallel ...

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acm International conference on Systems, programming, languages, and Applications: Software for Humanity, SPLASH'11

作者： Budimlić, Zoran Cavé, Vincent Raman, Raghavan Shirako, Jun Tasįrlar, Saǧnak Zhao, Jisheng Sarkar, Vivek Department of Computer Science Rice University United States

The Habanero-Java language extends sequential Java with a simple but powerful set of constructs for multicore parallelism. Its implementation includes a compiler that generates standard Java classfiles, a runtime syst... 详细信息

ISBN: (纸本)9781450309424

关键词： Parallel programming

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RefinedC: Automating the Foundational Verification of C Code with Refined Ownership Types 2021

RefinedC: Automating the Foundational Verification of C Code...

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42nd acm sigplan International conference on programming language design and implementation (PLDI)

作者： Sammler, Michael Lepigre, Rodolphe Krebbers, Robbert Memarian, Kayvan Dreyer, Derek Garg, Deepak MPI SWS Saarbrucken Germany Radboud Univ Nijmegen Nijmegen Netherlands Univ Cambridge Cambridge England

ISBN: (纸本)9781450383912

Given the central role that C continues to play in systems software, and the difficulty of writing safe and correct C code, it remains a grand challenge to develop effective formal methods for verifying C programs. In this paper, we propose a new approach to this problem: a type system we call RefinedC, which combines ownership types (for modular reasoning about shared state and concurrency) with refinement types (for encoding precise invariants on C data types and Hoare-style specifications for C functions). RefinedC is both automated (requiring minimal user intervention) and foundational (producing a proof of program correctness in Coq), while at the same time handling a range of low-level programming idioms such as pointer arithmetic. In particular, following the approach of RustBelt, the soundness of the RefinedC type system is justified semantically by interpretation into the Coq-based Iris framework for higherorder concurrent separation logic. However, the typing rules of RefinedC are also designed to be encodable in a new "separation logic programmingz language we call Lithium. By restricting to a carefully chosen (yet expressive) fragment of separation logic, Lithium supports predictable, automatic, goal-directed proof search without backtracking. We demonstrate the effectiveness of RefinedC on a range of representative examples of C code.

关键词： C programming language separation logic ownership types refinement types proof automation Iris Coq

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SPL^LIFT - Statically Analyzing Software Product Lines in Minutes Instead of Years 13

SPL<SUP>LIFT</SUP> - Statically Analyzing Software Product L...

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

作者： Bodden, Eric Toledo, Tarsis Ribeiro, Marcio Brabrand, Claus Borba, Paulo Mezini, Mira Tech Univ Darmstadt EC SPRIDE Darmstadt Germany IT Univ Copenhagen Copenhagen Denmark Univ Fed Pernambuco Recife PE Brazil Univ Fed Alagoas Maceio Brazil

ISBN: (纸本)9781450320146

A software product line (SPL) encodes a potentially large variety of software products as variants of some common code base. Up until now, re-using traditional static analyses for SPLs was virtually intractable, as it required programmers to generate and analyze all products individually. In this work, however, we show how an important class of existing inter-procedural static analyses can be transparently lifted to SPLs. Without requiring programmers to change a single line of code, our approach SPLLIFT automatically converts any analysis formulated for traditional programs within the popular IFDS framework for inter-procedural, finite, distributive, subset problems to an SPL-aware analysis formulated in the IDE framework, a well-known extension to IFDS. Using a full implementation based on Heros, Soot, CIDE and JavaBDD, we show that with SPLLIFT one can reuse IFDS-based analyses without changing a single line of code. Through experiments using three static analyses applied to four Java-based product lines, we were able to show that our approach produces correct results and outperforms the traditional approach by several orders of magnitude.

关键词： Software product lines inter-procedural static analysis context sensitive flow sensitive design languages Performance

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A framework for unrestricted whole-program optimization 06

A framework for unrestricted whole-program optimization

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acm sigplan conference on programming language design and implementation, PLDI 2006 - PLAS 2006: 2006 programming languages and Analysis for Security Workshop

作者： Triantafyllis, Spyridon Bridges, Matthew J. Raman, Easwaran Ottoni, Guilherme August, David I. Department of Computer Science Princeton University United States

ISBN: (纸本)1595933743

Procedures have long been the basic units of compilation in conventional optimization frameworks. However, procedures are typically formed to serve software engineering rather than optimization goals, arbitrarily constraining code transformations. Techniques, such as aggressive inlining and interprocedural optimization, have been developed to alleviate this problem, but, due to code growth and compile time issues, these can be applied only *** paper introduces the Procedure Boundary Elimination (PBE) compilation framework, which allows unrestricted whole-program optimization. PBE allows all intra-procedural optimizations and analyses to operate on arbitrary subgraphs of the program, regardless of the original procedure boundaries and without resorting to inlining. In order to control compilation time, PBE also introduces novel extensions of region formation and encapsulation. PBE enables targeted code specialization, which recovers the specialization benefits of inlining while keeping code growth in check. This paper shows that PBE attains better performance than inlining with half the code growth. Copyright © 2006 acm.

关键词： Computer programming

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Object-oriented programming in Scheme 88

Object-oriented programming in Scheme

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1988 acm conference on LISP and Functional programming, LFP 1988

作者： Adams, Norman Rees, Jonathan Tektronix Laboratories Tektronix M/S 50-662 BeavertonOR97077 United States Artificial Intelligence Laboratory Massachusetts Institute of Technology CambridgeMA02139 United States

ISBN: (纸本)089791273X

We describe a small set of additions to Scheme to support object-oriented programming, including a form of multiple inheritance. The extensions proposed are in keeping with the spirit of the Scheme language and consequently differ from Lisp-based object systems such as Flavors and the Common Lisp Object System. Our extensions mesh neatly with the underlying Scheme system. We motivate our design with examples, and then describe implementation techniques that yields efficiency comparable to dynamic object-oriented language implementations considered to be high performance. The complete design has an almost-portable implementation, and the core of this design comprises the object system used in T, a dialect of Scheme. The applicative bias of our approach is unusual in object-oriented programming systems. © 1988 acm.

关键词： Object oriented programming

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Using integer sets for data-parallel program analysis and optimization

Using integer sets for data-parallel program analysis and op...

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proceedings of the 1998 Annual acm sigplan conference on programming language design and implementation, PLDI

作者： Adve, Vikram Mellor-Crummey, John Rice Univ Houston United States

In this paper, we describe our experience with using an abstract integer-set framework to develop the Rice dHPF compiler, a compiler for High Performance Fortran. We present simple, yet general formulations of the major computation partitioning and communication analysis tasks as well as a number of important optimizations in terms of abstract operations on sets of integer tuples. This approach has made it possible to implement a comprehensive collection of advanced optimizations in dHPF, and to do so in the context of a more general computation partitioning model than previous compilers. One potential limitation of the approach is that the underlying class of integer set problems is fundamentally unable to represent HPF data distributions on a symbolic number of processors. We describe how we extend the approach to compile codes for a symbolic number of processors, without requiring any changes to the set formulations for the above optimizations. We show experimentally that the set representation is not a dominant factor in compile times on both small and large codes. Finally, we present preliminary performance measurements to show that the generated code achieves good speedups for a few benchmarks. Overall, we believe we are the first to demonstrate by implementation experience that it is practical to build a compiler for HPF using a general and powerful integer-set framework.

关键词： FORTRAN (programming language)

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Min-cut program decomposition for thread-level speculation

Min-cut program decomposition for thread-level speculation

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proceedings of the 2004 acm sigplan conference on programming language design and implementation (PLDI'04)

作者： Johnson, Troy A. Eigenmann, Rudolf Vijaykumar, T.N. Sch. of Elec. and Comp. Engineering Purdue University West Lafayette IN 47907 United States

With billion-transistor chips on the horizon, single-chip multiprocessors (CMPs) are likely to become commodity components. Speculative CMPs use hardware to enforce dependence, allowing the compiler to improve performance by speculating on ambiguous dependences without absolute guarantees of independence. The compiler is responsible for decomposing a sequential program into speculatively parallel threads, while considering multiple performance overheads related to data dependence, load imbalance, and thread prediction. Although the decomposition problem lends itself to a min-cut-based approach, the over-heads depend on the thread size, requiring the edge weights to be changed as the algorithm progresses. The changing weights make our approach different from graph-theoretic solutions to the general problem of task scheduling. One recent work uses a set of heuristics, each targeting a specific overhead in isolation, and gives precedence to thread prediction, without comparing the performance of the threads resulting from each heuristic. By contrast, our method uses a sequence of balanced min-cuts that give equal consideration to all the overheads, and adjusts the edge weights after every cut. This method achieves an (geometric) average speedup of 74% for floating-point programs and 23% for integer programs on a four-processor chip, improving on the 52% and 13% achieved by the previous heuristics.

关键词： Computer programming

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