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检索条件"任意字段=Proceedings of the 32nd ACM SIGPLAN Conference on Programming Language Design and Implementation"

共 71 条记录，以下是21-30 订阅

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Scooter & Sidecar: A Domain-Specific Approach to Writing Secure Database Migrations 2021

Scooter & Sidecar: A Domain-Specific Approach to Writing Sec...

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

作者： Renner, John Sanchez-Stern, Alex Brown, Fraser Lerner, Sorin Stefan, Deian Univ Calif San Diego La Jolla CA 92093 USA

ISBN: (纸本)9781450383912

Web applications often handle large amounts of sensitive user data. Modern secure web frameworks protect this data by (1) using declarative languages to specify security policies alongside database schemas and (2) automatically enforcing these policies at runtime. Unfortunately, these frameworks do not handle the very common situation in which the schemas or the policies need to evolve over time-and updates to schemas and policies need to be performed in a carefully coordinated way. Mistakes during schema or policy migrations can unintentionally leak sensitive data or introduce privilege escalation bugs. In this work, we present a domain-specific language (Scooter) for expressing schema and policy migrations, and an associated SMT-based verifier (Sidecar) which ensures that migrations are secure as the application evolves. We describe the design of Scooter and Sidecar and show that our framework can be used to express realistic schemas, policies, and migrations, without giving up on runtime or verification performance.

关键词： database migration verification secure ORM domain-specific language

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AARTS: Low overhead online adaptive auto-tuning 11

AARTS: Low overhead online adaptive auto-tuning

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1st acm sigplan International Workshop on Adaptive Self-Tuning Computing Systems for the Exaflop Era, Exadapt 2011 - Co-located with 32nd acm sigplan conference on programming language design and implementation, PLDI 2011 at FCRC 2011

作者： Teodoro, George Sussman, Alan Department of Computer Science University of Maryland College Park MD 20742 United States

ISBN: (纸本)9781450307086

We present an online lightweight auto-tuning system for shared-memory parallel programs. We employ an online adaptive tuning algorithm that is based on performance measurements, to adapt to performance variability that arises during program execution. We address the impact of synchronous vs. asynchronous interactions between the application and the tuning system, and describe an adaptive approach that benefits from the improvements provided by both options. We presented a performance study of the online tuning system, and compared it to synchronous tuning systems. Finally, AARTS is evaluated under different scenarios, showing the potential benefits of using online tuning and the ability of AARTS to exploit those benefits. © 2011 acm.

关键词： Computer programming

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language-independent sandboxing of just-in-time compilation and self-modifying code 11

Language-independent sandboxing of just-in-time compilation ...

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32nd acm conference on programming language design and implementation, PLDI 2011

作者： Ansel, Jason Marchenko, Petr Erlingsson, Ulfar Taylor, Elijah Chen, Brad Schuff, Derek L. Sehr, David Biffle, Cliff L. Yee, Bennet Computer Science and Artificial Intelligence Laboratory Massachusetts Institute of Technology United States University College London United Kingdom Google Inc. United States

ISBN: (纸本)9781450306638

When dealing with dynamic, untrusted content, such as on the Web, software behavior must be sandboxed, typically through use of a language like JavaScript. However, even for such specially-designed languages, it is difficult to ensure the safety of highly-optimized, dynamic language runtimes which, for efficiency, rely on advanced techniques such as Just-In-Time (JIT) compilation, large libraries of native-code support routines, and intricate mechanisms for multi-threading and garbage collection. Each new runtime provides a new potential attack surface and this security risk raises a barrier to the adoption of new languages for creating untrusted content. Removing this limitation, this paper introduces general mechanisms for safely and efficiently sandboxing software, such as dynamic language runtimes, that make use of advanced, low-level techniques like runtime code modification. Our language-independent sandboxing builds on Software-based Fault Isolation (SFI), a traditionally static technique. We provide a more flexible form of SFI by adding new constraints and mechanisms that allow safety to be guaranteed despite runtime code modifications. We have added our extensions to both the x86-32 and x86-64 variants of a production-quality, SFI-based sandboxing platform;on those two architectures SFI mechanisms face different challenges. We have also ported two representative language platforms to our extended sandbox: the Mono common language runtime and the V8 JavaScript engine. In detailed evaluations, we find that sandboxing slowdown varies between different benchmarks, languages, and hardware platforms. Overheads are generally moderate and they are close to zero for some important benchmark/platform combinations. © 2011 acm.

关键词： Dynamics

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A simple typed intermediate language for object-oriented languages 05

A simple typed intermediate language for object-oriented lan...

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POPL 2005: The 32nd acm sigplan-SIGACT Symposium on Principles of programming languages

作者： Chen, Juan Tarditi, David Microsoft Research One Microsoft Way Redmond WA 98052 United States

ISBN: (纸本)9781581138306

Traditional class and object encodings are difficult to use in practical type-preserving compilers because of the complexity of the encodings. We propose a simple typed intermediate language for compiling object-oriented languages and prove its soundness. The key ideas are to preserve lightweight notions of classes and objects instead of compiling them away and to separate name-based subclassing from structure-based subtyping. The language can express standard implementation techniques for both dynamic dispatch and runtime type tests. It has decidable type checking even with subtyping between quantified types with different bounds. Because of its simplicity, the language is a more suitable starting point for a practical type-preserving compiler than traditional encoding techniques. Copyright 2005 acm.

关键词： Object oriented programming

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Reticle: A Virtual Machine for programming Modern FPGAs 2021

Reticle: A Virtual Machine for Programming Modern FPGAs

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

作者： Vega, Luis McMahan, Joseph Sampson, Adrian Grossman, Dan Ceze, Luis Univ Washington Seattle WA 98195 USA Cornell Univ Ithaca NY 14853 USA

ISBN: (纸本)9781450383912

Modern field-programmable gate arrays (FPGAs) have recently powered high-profile efficiency gains in systems from datacenters to embedded devices by offering ensembles of heterogeneous, reconfigurable hardware units. programming stacks for FPGAs, however, are stuck in the past-they are based on traditional hardware languages, which were appropriate when FPGAs were simple, homogeneous fabrics of basic programmable primitives. We describe Reticle, a new low-level abstraction for FPGA programming that, unlike existing languages, explicitly represents the special-purpose units available on a particular FPGA device. Reticle has two levels: a portable intermediate language and a target-specific assembly language. We show how to use a standard instruction selection approach to lower intermediate programs to assembly programs, which can be both faster and more effective than the complex metaheuristics that existing FPGA toolchains use. We use Reticle to implement linear algebra operators and coroutines and find that Reticle compilation runs up to 100 times faster than current approaches while producing comparable or better run-time and utilization.

关键词： compilers FPGAs

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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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Sound Probabilistic Inference via Guide Types 2021

Sound Probabilistic Inference via Guide Types

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

作者： Wang, Di Hoffmann, Jan Reps, Thomas Carnegie Mellon Univ Pittsburgh PA 15213 USA Univ Wisconsin Madison WI 53706 USA

ISBN: (纸本)9781450383912

Probabilistic programming languages aim to describe and automate Bayesian modeling and inference. Modern languages support programmable inference, which allows users to customize inference algorithms by incorporating guide programs to improve inference performance. For Bayesian inference to be sound, guide programs must be compatible with model programs. One pervasive but challenging condition for model-guide compatibility is absolute continuity, which requires that the model and guide programs define probability distributions with the same support. This paper presents a new probabilistic programming language that guarantees absolute continuity, and features general programming constructs, such as branching and recursion. Model and guide programs are implemented as coroutines that communicate with each other to synchronize the set of random variables they sample during their execution. Novel guide types describe and enforce communication protocols between coroutines. If the model and guide are well-typed using the same protocol, then they are guaranteed to enjoy absolute continuity. An efficient algorithm infers guide types from code so that users do not have to specify the types. The new programming language is evaluated with an implementation that includes the type-inference algorithm and a prototype compiler that targets Pyro. Experiments show that our language is capable of expressing a variety of probabilistic models with nontrivial control flow and recursion, and that the coroutine-based computation does not introduce significant overhead in actual Bayesian inference.

关键词： Probabilistic programming Bayesian inference type systems coroutines

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MixT: A language for Mixing Consistency in Geodistributed Transactions 2018

MixT: A Language for Mixing Consistency in Geodistributed Tr...

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

作者： Milano, Matthew Myers, Andrew C. Cornell Univ Dept Comp Sci Ithaca NY 14853 USA

ISBN: (纸本)9781450356985

programming concurrent, distributed systems is hard-especially when these systems mutate shared, persistent state replicated at geographic scale. To enable high availability and scalability, a new class of weakly consistent data stores has become popular. However, some data needs strong consistency. To manipulate both weakly and strongly consistent data in a single transaction, we introduce a new abstraction: mixed-consistency transactions, embodied in a new embedded language, MixT. Programmers explicitly associate consistency models with remote storage sites;each atomic, isolated transaction can access a mixture of data with different consistency models. Compile-time information-flow checking, applied to consistency models, ensures that these models are mixed safely and enables the compiler to automatically partition transactions. New run-time mechanisms ensure that consistency models can also be mixed safely, even when the data used by a transaction resides on separate, mutually unaware stores. Performance measurements show that despite their stronger guarantees, mixed-consistency transactions retain much of the speed of weak consistency, significantly outperforming traditional serializable transactions.

关键词： Consistency Transactions Information Flow

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Archface: A contract place where architectural design and code meet together 10

Archface: A contract place where architectural design and co...

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32nd acm/IEEE International conference on Software Engineering, ICSE 2010

作者： Ubayashi, Naoyasu Nomura, Jun Tamai, Tetsuo Kyushu University Fukuoka Japan Kyushu Institute of Technology Fukuoka Japan University of Tokyo Tokyo Japan

ISBN: (纸本)9781605587196

This paper proposes Archface, an interface mechanism for bridging the gap between architectural design and its implementation. Archface, which encapsulates design essence based on the component-and-connector architecture, is not only an ADL (Architecture Description language) but also a programming-level interface. Archface is effective for software evolution because traceability between design and its implementation can be realized by enforcing architectural constraints on program implementation, and this traceability is bidirectional. In Archface, a component exposes program points such as method call/execution and a connector defines how to coordinate exposed program points. A collaborative architecture consisting of components can be encapsulated into a group of interfaces and separated from implementation, because dynamic program points representing control flow can be specified in the interfaces. We can characterize the notion of Archface with the phrase "predicate coordination," in which program points are exposed by a predicate and coordinated by a trait-based connector. © 2010 acm.

关键词： Architectural design

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Strongtalk: Typechecking smalltalk in a production environment 8

Strongtalk: Typechecking smalltalk in a production environme...

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8th Annual conference on Object-Oriented programming Systems, languages, and Applications, OOPSLA 1993

作者： Bracha, Gilad Griswold, David Horizon Technologies of New York Inc. 38 W. 32nd St. New YorkNY10001 United States

ISBN: (纸本)0897915879

Strongtalk™ is a typechecker for a downwardcompatible Smalltalk dialect. It is designed for large-scale production software development, and incorporates a strong, modem structural type system. It not only separates the notions of type and class, but also deals with the more difficult issue of separating inheritance and subtyping using the notion of inherited types [CHC90, Bru93a] to preserve encapsulation. Strongtalk integrates inherited types, metaclasses, blocks and polymorphic methods into a highly usable, full-scale language. © 1993 acm.

关键词： Software design

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