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Mostly-Automated Verification of Low-Level Programs in Computational Separation Logic 11

Mostly-Automated Verification of Low-Level Programs in Compu...

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32nd acm sigplan conference on programming language design and implementation (PLDI 11)

作者： Chlipala, Adam Harvard Univ Cambridge MA 02138 USA

ISBN: (纸本)9781450306638

Several recent projects have shown the feasibility of verifying low-level systems software. Verifications based on automated theorem-proving have omitted reasoning about first-class code pointers, which is critical for tasks like certifying implementations of threads and processes. Conversely, verifications that deal with first-class code pointers have featured long, complex, manual proofs. In this paper, we introduce the Bedrock framework, which supports mostly-automated proofs about programs with the full range of features needed to implement, e.g., language runtime systems. The heart of our approach is in mostly-automated discharge of verification conditions inspired by separation logic. Our take on separation logic is computational, in the sense that function specifications are usually written in terms of reference implementations in a purely functional language. Logical quantifiers are the most challenging feature for most automated verifiers;by relying on functional programs (written in the expressive language of the Coq proof assistant), we are able to avoid quantifiers almost entirely. This leads to some dramatic improvements compared to both past work in classical verification, which we compare against with implementations of data structures like binary search trees and hash tables;and past work in verified programming with code pointers, which we compare against with examples like function memoization and a cooperative threading library.

关键词： interactive proof assistants separation logic low-level programming languages functional programming

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programming with Binders and Indexed Data-Types 12

Programming with Binders and Indexed Data-Types

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39th Annual acm sigplan-SIGACT Symposium on Principles of programming languages

作者： Cave, Andrew Pientka, Brigitte McGill Univ Montreal PQ H3A 2T5 Canada

ISBN: (纸本)9781450310833

We show how to combine a general purpose type system for an existing language with support for programming with binders and contexts by refining the type system of ML with a restricted form of dependent types where index objects are drawn from contextual LF. This allows the user to specify formal systems within the logical framework LF and index ML types with contextual LF objects. Our language design keeps the index language generic only requiring decidability of equality of the index language providing a modular design. To illustrate the elegance and effectiveness of our language, we give programs for closure conversion and normalization by evaluation. Our three key technical contribution are: 1) We give a bidirectional type system for our core language which is centered around refinement substitutions instead of constraint solving. As a consequence, type checking is decidable and easy to trust, although constraint solving may be undecidable. 2) We give a big-step environment based operational semantics with environments which lends itself to efficient implementation. 3) We prove our language to be type safe and have mechanized our theoretical development in the proof assistant Coq using the fresh approach to binding.

关键词： Logical frameworks higher-order abstract syntax dependent types recursive types

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Almost First-Class language Embedding Taming Staged Embedded DSLs 2015

Almost First-Class Language Embedding Taming Staged Embedded...

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14th acm sigplan International conference on Generative-programming - Concepts and Experiences (GPCE) co-located with SPLASH conference

作者： Scherr, Maximilian Chiba, Shigeru Univ Tokyo Tokyo Japan

ISBN: (纸本)9781450336871

Embedded domain-specific languages (EDSLs), inheriting a general-purpose language's features as well as look-and-feel, have traditionally been second-class or rather non-citizens in terms of host-language design. This makes sense when one regards them to be on the same level as traditional, non-EDSL library interfaces. However, this equivalence only applies to the simplest of EDSLs. In this paper we illustrate why this is detrimental when moving on to EDSLs that employ staging, i.e. program reification, by example of various issues that affect authors and users alike. We believe that if EDSLs are to be considered a reliable, language-like interface abstraction, they require exceptional attention and design scrutiny. Instead of unenforceable conventions, we advocate the acceptance of EDSLs as proper, i.e. almost first-class, citizens while retaining most advantages of pure embeddings. As a small step towards this goal, we present a pragmatic framework prototype for Java. It is based on annotations that explicate and document membership to explicit EDSL entities. In a nutshell, our framework identifies (annotated) method calls and field accesses as EDSL terms and dynamically constructs an abstract-syntax representation, which is eventually passed to a semantics-defining back end implemented by the EDSL author.

关键词： Java implementation embedded DSLs metaprogramming program transformation staging programming languages design

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LoCal: A language for Programs Operating on Serialized Data 2019

LoCal: A Language for Programs Operating on Serialized Data

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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： Vollmer, Michael Koparkar, Chaitanya Rainey, Mike Sakka, Laith Kulkarni, Milind Newton, Ryan R. Indiana Univ Comp Sci Bloomington IN 47405 USA Purdue Univ Elect & Comp Engn W Lafayette IN 47907 USA

ISBN: (纸本)9781450367127

In a typical data-processing program, the representation of data in memory is distinct from its representation in a serialized form on disk. The former has pointers and arbitrary, sparse layout, facilitating easy manipulation by a program, while the latter is packed contiguously, facilitating easy I/O. We propose a language, LoCal, to unify in-memory and serialized formats. LoCal extends a region calculus into a location calculus, employing a type system that tracks the byte-addressed layout of all heap values. We formalize LoCal and prove type safety, and show how LoCal programs can be inferred from unannotated source terms. We transform the existing Gibbon compiler to use LoCal as an intermediate language, with the goal of achieving a balance between code speed and data compactness by introducing just enough indirection into heap layouts, preserving the asymptotic complexity of traditional representations, but working with mostly or completely serialized data. We show that our approach yields significant performance improvement over prior approaches to operating on packed data, without abandoning idiomatic programming with recursive functions.

关键词： Region Calculus Compiler Optimization Data Encoding Tree Traversal

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Web Question Answering with Neurosymbolic Program Synthesis 2021

Web Question Answering with Neurosymbolic Program Synthesis

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

作者： Chen, Qiaochu Lamoreaux, Aaron Wang, Xinyu Durrett, Greg Bastani, Osbert Dillig, Isil Univ Texas Austin Austin TX 78712 USA Univ Michigan Ann Arbor MI 48109 USA Univ Penn Philadelphia PA 19104 USA

ISBN: (纸本)9781450383912

In this paper, we propose a new technique based on program synthesis for extracting information from webpages. Given a natural language query and a few labeled webpages, our method synthesizes a program that can be used to extract similar types of information from other unlabeled webpages. To handle websites with diverse structure, our approach employs a neurosymbolic DSL that incorporates both neural NLP models as well as standard language constructs for tree navigation and string manipulation. We also propose an optimal synthesis algorithm that generates all DSL programs that achieve optimal F-1 score on the training examples. Our synthesis technique is compositional, prunes the search space by exploiting a monotonicity property of the DSL, and uses transductive learning to select programs with good generalization power. We have implemented these ideas in a new tool called WEBQA and evaluate it on 25 different tasks across multiple domains. Our experiments show that WEBQA significantly outperforms existing tools such as state-of-the-art question answering models and wrapper induction systems.

关键词： Program Synthesis programming by Example Web Information Extraction

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Maintaining the consistency of class libraries during their evolution

Maintaining the consistency of class libraries during their ...

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1997 acm sigplan conference on Object-Oriented programming Systems, languages and Applications (OOPSLA 97)

作者： Mezini, M Univ of Siegen Siegen Germany

Two important problems of object-oriented reuse are the propagation of design and implementation specifics of the base software to the inheritors, and the protection of the inheritors against changes in the base software. In this paper, we argue that the simple inheritance rules of existing object-oriented languages are not sufficient for properly dealing with these problems. In the proposal presented in this paper, programmers are enabled to make metalevel declarations of the internal protocols and dependencies of their classes. Additionally, changes of the base module are automatically monitored to filter out information about the alterations that may invalidate already existing inheritors. Based on these informations, the subclassing semantics is adjusted such that the maintenance of the base module properties and the protection of the inheritor is ensured during their integration. In this way, language support is provided for keeping the behavior of reusable software consistent during its evolution.

关键词： Object oriented programming

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Decoupled Lifeguards: Enabling Path Optimizations for Dynamic Correctness Checking Tools 10

Decoupled Lifeguards: Enabling Path Optimizations for Dynami...

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acm sigplan conference on programming language design and implementation

作者： Ruwase, Olatunji Chen, Shimin Gibbons, Phillip B. Mowry, Todd C. Carnegie Mellon Univ Pittsburgh PA 15213 USA Intel Labs Pittsburgh Pittsburgh PA USA

ISBN: (纸本)9781450300193

Dynamic correctness checking tools (a.k.a. lifeguards) can detect a wide array of correctness issues, such as memory, security, and concurrency misbehavior, in unmodified executables at run time. However, lifeguards that are implemented using dynamic binary instrumentation (DBI) often slow down the monitored application by 10-50X, while proposals that replace DBI with hardware still see 3-8X slowdowns. The remaining overhead is the cost of performing the lifeguard analysis itself. In this paper, we explore compiler optimization techniques to reduce this overhead. The lifeguard software is typically structured as a set of event-driven handlers, where the events are individual instructions in the monitored application's dynamic instruction stream. We propose to decouple the lifeguard checking code from the application that it is monitoring so that the lifeguard analysis can be invoked at the granularity of hot paths in the monitored application. In this way, we are able to find many more opportunities for eliminating redundant work in the lifeguard analysis, even starting with well-optimized applications and hand-tuned lifeguard handlers. Experimental results with two lifeguard frameworks-one DBI-based and one hardware-assisted-show significant reduction in monitoring overhead.

关键词： design Performance Reliability Security Dynamic code optimizations Dynamic correctness checking Dynamic program analysis

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Formal design constraints 96

Formal design constraints

引用

Proceedings of the 1996 conference on Object-Oriented programming Systems, languages & Applications

作者： Klarlund, Nils Koistinen, Jari Schwartzbach, Michael I. Univ of Aarhus Aarhus Denmark

ISBN: (纸本)9780897917889

Large software systems are often built on system platforms that support or enforce specific characteristics of the source code or actual design. These characteristics are either captured informally in design guideline documents or in specialized design and implementation languages. In our view, both approaches are unsatisfactory. Informal descriptions do not allow automated analysis and lead to vague constraint descriptions. The language-based approach leads to different languages for different platforms and even for different versions of the same basic platform. Our approach is to describe and name the constraints separately in a design constraint language called CDL, which is based on an extraordinarily concise logic of parse trees. designs are then annotated with the names of the constraints they are supposed to satisfy. We discuss how the design constraint language is integrated into a design language environment. We exhibit industrial and experimental evidence that our choice of design constraint language allows us to formalize naturally and succinctly common design characteristics.

关键词： Object oriented programming

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Polyhedral Auto-transformation with No Integer Linear programming 2018

Polyhedral Auto-transformation with No Integer Linear Progra...

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

作者： Acharya, Aravind Bondhugula, Uday Cohen, Albert Indian Inst Sci Dept Comp Sci & Automat Bangalore Karnataka India INRIA Paris France DI Ecole Normale Super Paris France

ISBN: (纸本)9781450356985

State-of-the-art algorithms used in automatic polyhedral transformation for parallelization and locality optimization typically rely on Integer Linear programming (ILP). This poses a scalability issue when scaling to tens or hundreds of statements, and may be disconcerting in production compiler settings. In this work, we consider relaxing integrality in the ILP formulation of the Pluto algorithm, a popular algorithm used to find good affine transformations. We show that the rational solutions obtained from the relaxed LP formulation can easily be scaled to valid integral ones to obtain desired solutions, although with some caveats. We first present formal results connecting the solution of the relaxed LP to the original Pluto ILP. We then show that there are difficulties in realizing the above theoretical results in practice, and propose an alternate approach to overcome those while still leveraging linear programming. Our new approach obtains dramatic compile-time speedups for a range of large benchmarks. While achieving these compile-time improvements, we show that the performance of the transformed code is not sacrificed. Our approach to automatic transformation provides a mean compilation time improvement of 5.6x over state-of-the-art on relevant challenging benchmarks from the NAS PB, SPEC CPU 2006, and PolyBench suites. We also came across situations where prior frameworks failed to find a transformation in a reasonable amount of time, while our new approach did so instantaneously.

关键词： Polyhedral transformation Pluto algorithm

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GUM: a portable parallel implementation of Haskell

GUM: a portable parallel implementation of Haskell

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Proceedings of the acm sigplan'96 conference on programming language design and implementation, PLDI

作者： Trinder, P.W. Hammond, K. Mattson Jr., J.S. Partridge, A.S. Jones, S.L.Peyton Glasgow Univ Glasgow United Kingdom

GUM is a portable, parallel implementation of the Haskell functional language. Despite sustained research interest in parallel functional programming, GUM is one of the first such systems to be made publicly available. GUM is message-based, and portability is facilitated by using the PVM communications harness that is available on many multi-processors. As a result, GUM is available for both shared-memory (Sun SPARCserver multiprocessors) and distributed-memory (networks of workstations) architectures. The high message-latency of distributed machines is ameliorated by sending messages asynchronously, and by sending large packets of related data in each message. Initial performance figures demonstrate absolute speedups relative to the best sequential compiler technology. To improve the performance of a parallel Haskell program GUM provides tools for monitoring and visualising the behaviour of threads and of processors during execution.

关键词： Computer programming languages

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