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检索条件"任意字段=33rd ACM SIGPLAN Conference on Programming Language Design and Implementation"

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language Transformations in the Classroom 28

Language Transformations in the Classroom

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

作者： Cimini, Matteo Mourad, Benjamin Univ Massachusetts Lowell Lowell MA 01854 USA

language transformations are algorithms that take a language specification in input, and return the language specification modified. language transformations are useful for automatically adding features such as subtyping to programming languages (PLs), and for automatically deriving abstract machines. In this paper, we set forth the thesis that teaching programming languages features with the help of language transformations, in addition to the planned material, can be beneficial for students to help them deepen their understanding of the features being taught. We have conducted a study on integrating language transformations into an undergraduate PL course. We describe our study, the material that we have taught, and the exam submitted to students, and we present the results from this study. Although we refrain from drawing general conclusions on the effectiveness of language transformations, this paper offers encouraging data. We also offer this paper to inspire similar studies.

关键词： Students

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Invertible Syntax Descriptions: Unifying Parsing and Pretty Printing

Invertible Syntax Descriptions: Unifying Parsing and Pretty ...

引用

3rd acm Haskell Symposium on Haskell

作者： Rendel, Tillmann Ostermann, Klaus Univ Marburg D-35032 Marburg Germany

ISBN: (纸本)9781450302524

Parsers and pretty-printers for a language are often quite similar, yet both are typically implemented separately, leading to redundancy and potential inconsistency. We propose a new interface of syntactic descriptions, with which both parser and pretty-printer can be described as a single program. Whether a syntactic description is used as a parser or as a pretty-printer is determined by the implementation of the interface. Syntactic descriptions enable programmers to describe the connection between concrete and abstract syntax once and for all, and use these descriptions for parsing or pretty-printing as needed. We also discuss the generalization of our programming technique towards an algebra of partial isomorphisms.

关键词： design languages embedded domain specific languages invertible computation parser combinators pretty printing

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Modula-2 and Oberon

Modula-2 and Oberon

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3rd acm sigplan History of programming languages conference, HOPL-III

作者： Wirth, Niklaus ETH Zurich

ISBN: (纸本)9781595937667

This is an account of the development of the languages Modula-2 and Oberon. Together with their ancestors ALGOL 60 and Pascal they form a family called Algol-like languages. Pascal (1970) reflected the ideas of structured programming, Modula-2 (1979) added those of modular system design, and Oberon (1988) catered to the object-oriented style. Thus they mirror the essential programming paradigms of the past decades. Here the major language properties are outlined, followed by an account of the respective implementation efforts. The conditions and the environments in which the languages were created are elucidated. We point out that simplicity of design was the most essential guiding principle. Clarity of concepts, economy of features, efficiency and reliability of implementations were its consequences. © 2007 acm.

关键词： Computer programming languages

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Semantic Soundness for language Interoperability 2022

Semantic Soundness for Language Interoperability

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

作者： Patterson, Daniel Mushtak, Noble Wagner, Andrew Ahmed, Amal Northeastern Univ Boston MA 02115 USA

ISBN: (纸本)9781450392655

Programs are rarely implemented in a single language, and thus questions of type soundness should address not only the semantics of a single language, but how it interacts with others. Even between type-safe languages, disparate features can frustrate interoperability, as invariants from one language can easily be violated in the other. In their seminal 2007 paper, Matthews and Findler proposed a multi-language construction that augments the interoperating languages with a pair of boundaries that allow code from one language to be embedded in the other. While this technique has been widely applied, their syntactic source-level interoperability doesn't reflect practical implementations, where the behavior of interaction is only defined after compilation to a common target, and any safety must be ensured by target invariants or inserted target-level "glue code." In this paper, we present a novel framework for the design and verification of sound language interoperability that follows an interoperation-after-compilation strategy. language designers specify what data can be converted between types of the two languages via a convertibility relation tau(A) similar to tau(B) ("tau(A) is convertible to tau(B)") and specify target-level glue code implementing the conversions. Then, by giving a semantic model of source-language types as sets of target-language terms, they can establish not only the meaning of the source types, but also soundness of conversions: i.e., whenever tau(A) similar to tau(B), the corresponding pair of conversions (glue code) convert target terms that behave like tau(A) to target terms that behave like tau(B), and vice versa. With this, they can prove semantic type soundness for the entire system. We illustrate our framework via a series of case studies that demonstrate how our semantic interoperation-after-compilation approach allows us both to account for complex differences in language semantics and make efficiency trade-offs based on particulariti

关键词： language interoperability type soundness semantics logical relations

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Harmless advice 06

Harmless advice

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33rd acm sigplan-SIGACT Symposium on Principles of programming languages, POPL'06

作者： Dantas, Daniel S. Walker, David Princeton University United States

ISBN: (纸本)1595930272

This paper defines an object-oriented language with harmless aspect-oriented advice. A piece of harmless advice is a computation that, like ordinary aspect-oriented advice, executes when control reaches a designated control-flow point. However, unlike ordinary advice, harmless advice is designed to obey a weak non-interference property. Harmless advice may change the termination behavior of computations and use I/O, but it does not otherwise influence the final result of the mainline code. The benefit of harmless advice is that it facilitates local reasoning about program behavior. More specifically, programmers may ignore harmless advice when reasoning about the partial correctness properties of their programs. In addition, programmers may add new pieces of harmless advice to pre-existing programs in typical "after-the-fact" aspect-oriented style without fear they will break important data invariants used by the mainline code. In order to detect and enforce harmlessness, the paper defines a novel type and effect system related to information-flow type systems. The central technical result is that well-typed harmless advice does not interfere with the mainline computation. The paper also presents an implementation of the language and a case study using harmless advice to implement security policies. Copyright © 2006 acm.

关键词： Object oriented programming

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PDL A High-Level Hardware design language for Pipelined Processors 2022

PDL A High-Level Hardware Design Language for Pipelined Proc...

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

作者： Zagieboylo, Drew Sherk, Charles Suh, Gookwon Edward Myers, Andrew C. Cornell Univ Dept Comp Sci Ithaca NY 14853 USA Cornell Univ Sch Elect & Comp Engn Ithaca NY 14853 USA

ISBN: (纸本)9781450392655

Processors are typically designed in Register Transfer Level (RTL) languages, which give designers low-level control over circuit structure and timing. To achieve good performance, processors are pipelined, with multiple instructions executing concurrently in different parts of the circuit. Thus even though processors implement a fundamentally sequential specification (the instruction set architecture), the implementation is highly concurrent. The interactions of multiple instructions-potentially speculative-can cause incorrect behavior. We present PDL, a novel hardware description language targeted at the construction of pipelined processors. PDL provides one-instruction-at-a-time semantics: the first language to enforce that the generated pipelined circuit has the same behavior as a sequential specification. This enforcement facilitates design-space exploration. Adding or removing pipeline stages, moving operations across stages, or otherwise changing pipeline structure normally requires careful analysis of bypass paths and stall logic;with PDL, this analysis is handled by the PDL compiler. At the same time, PDL still offers designers fine-grained control over performance-critical microarchitectural choices such as timing of operations, data forwarding, and speculation. We demonstrate PDL's expressive power and ease of design exploration by implementing several RISC-V cores with differing microarchitectures. Our results show that PDL does not impose significant performance or area overhead compared to a standard HDL.

关键词： Computer Architecture language design

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Visualization Question Answering using Introspective Program Synthesis 2022

Visualization Question Answering using Introspective Program...

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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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Exocompilation for Productive programming of Hardware Accelerators 2022

Exocompilation for Productive Programming of Hardware Accele...

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

作者： Ikarashi, Yuka Bernstein, Gilbert Louis Reinking, Alex Genc, Hasan Ragan-Kelley, Jonathan MIT CSAIL Cambridge MA 02139 USA Univ Calif Berkeley Berkeley CA USA

ISBN: (纸本)9781450392655

High-performance kernel libraries are critical to exploiting accelerators and specialized instructions in many applications. Because compilers are difficult to extend to support diverse and rapidly-evolving hardware targets, and automatic optimization is often insufficient to guarantee state-of-the-art performance, these libraries are commonly still coded and optimized by hand, at great expense, in low-level C and assembly. To better support development of high-performance libraries for specialized hardware, we propose a new programming language, Exo, based on the principle of exocompilation: externalizing target-specific code generation support and optimization policies to user-level code. Exo allows custom hardware instructions, specialized memories, and accelerator configuration state to be defined in user libraries. It builds on the idea of user scheduling to externalize hardware mapping and optimization decisions. Schedules are defined as composable rewrites within the language, and we develop a set of effect analyses which guarantee program equivalence and memory safety through these transformations. We show that Exo enables rapid development of state-of-the-art matrix-matrix multiply and convolutional neural network kernels, for both an embedded neural accelerator and x86 with AVX-512 extensions, in a few dozen lines of code each.

关键词： program optimization hardware accelerators user-schedulable languages instruction abstraction scheduling user-extensible backend & scheduling

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WebRobot: Web Robotic Process Automation using Interactive programming-by-Demonstration 2022

WebRobot: Web Robotic Process Automation using Interactive P...

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

作者： Dong, Rui Huang, Zhicheng Lam, Ian Iong Chen, Yan Wang, Xinyu Univ Michigan Ann Arbor MI 48109 USA Univ Toronto Toronto ON Canada

ISBN: (纸本)9781450392655

It is imperative to democratize robotic process automation (RPA), as RPA has become a main driver of the digital transformation but is still technically very demanding to construct, especially for non-experts. In this paper, we study how to automate an important class of RPA tasks, dubbed web RPA, which are concerned with constructing software bots that automate interactions across data and a web browser. Our main contributions are twofold. First, we develop a formal foundation which allows semantically reasoning about web RPA programs and formulate its synthesis problem in a principled manner. Second, we propose a web RPA program synthesis algorithm based on a new idea called speculative rewriting. This leads to a novel speculate-and-validate methodology in the context of rewrite-based program synthesis, which has also shown to be both theoretically simple and practically efficient for synthesizing programs from demonstrations. We have built these ideas in a new interactive synthesizer called WEBROBOT and evaluate it on 76 web RPA benchmarks. Our results show that WEBROBOT automated a majority of them effectively. Furthermore, we show that WEBROBOT compares favorably with a conventional rewrite-based synthesis baseline implemented using egg. Finally, we conduct a small user study demonstrating WEBROBOT is also usable.

关键词： Program Synthesis programming by Demonstration Rewrite-based Synthesis Robotic Process Automation Web Automation Human-in-the-loop

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The when, why and why not of the BETA programming language

The when, why and why not of the BETA programming language

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3rd acm sigplan History of programming languages conference, HOPL-III

作者： Kristensen, Bent Bruun Madsen, Ole Lehrmann Møller-Pedersen, Birger University of Southern Denmark Campusvej 55 DK-5230 Odense M Denmark University of Aarhus Åbogade 34 DK-8200 Århus N Denmark University of Oslo Gaustadalleen 23 NO-0316 Oslo Norway

ISBN: (纸本)9781595937667

This paper tells the story of the development of BETA: a programming language with just one abstraction mechanism, instead of one abstraction mechanism for each kind of program element (classes, types, procedures, functions, etc.). The paper explains how this single abstraction mechanism, the pattern, came about and how it was designed to be so powerful that it covered the other mechanisms. In addition to describing the technical challenge of capturing all programming elements with just one abstraction mechanism, the paper also explains how the language was based upon a modeling approach, so that it could be used for analysis, design and implementation. It also illustrates how this modeling approach guided and settled the design of specific language concepts. The paper compares the BETA programming language with other languages and explains how such a minimal language can still support modeling, even though it does not have some of the language mechanisms found in other object-oriented languages. Finally, the paper tries to convey the organization, working conditions and social life around the BETA project, which turned out to be a lifelong activity for Kristen Nygaard, the authors of this paper, and many others. © 2007 acm.

关键词： Computer programming languages

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