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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...

引用

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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Formal loop merging for signal transforms

Formal loop merging for signal transforms

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conference on programming language design and implementation

作者： Franchetti, F Voronenko, Y Püschel, M Carnegie Mellon Univ Dept Elect & Comp Engn Pittsburgh PA 15213 USA

A critical optimization in the domain of linear signal transforms, such as the discrete Fourier transform (DFT), is loop merging, which increases data locality and reuse and thus performance. In particular, this includes the conversion of shuffle operations into array reindexings. To date, loop merging is well understood only for the DFT, and only for Cooley-Tukey FFT based algorithms, which excludes DFT sizes divisible by large primes. In this paper, we present a formal loop merging framework for general signal transforms and its implementation within the SPIRAL code generator. The framework consists of Sigma-SPL, a mathematical language to express loops and index mappings;a rewriting system to merge loops in E-SPL;and a compiler that translates Sigma-SPL into code. We apply the framework to DFT sizes that cannot be handled using only the Cooley-Tukey FFT and compare our method to FFTW 3.0.1 and the vendor library Intel MKL 7.2.1. Compared to FFTW our generated code is a factor of 2-4 faster under equal implementation conditions (same algorithms, same unrolling threshold). For some sizes we show a speed-up of a factor of 9 using Bluestein's algorithm. Further, we give a detailed comparison against the Intel vendor library MKL;our generated code is between 2 times faster and 4.5 times slower.

关键词： linear signal transform discrete Fourier transform DFT loop optimization domain-specific language automatic performance tuning

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A Web Application Is a Domain-Specific language

A Web Application Is a Domain-Specific Language

引用

acm sigplan International conference on Systems, programming, languages and Applications: Software for Humanity (SPLASH Companion)

作者： Lorenz, David H. Rosenan, Boaz Open Univ IL-43107 Raanana Israel Technion Israel Inst Technol IL-32000 Haifa Israel Univ Haifa IL-31905 Haifa Israel

ISBN: (纸本)9781450344371

We introduce a correspondence between the design space of web applications and that of domain-specific languages (DSLs). We note that while most web applications today are implemented in ways that correspond to external DSLs, very little attention is given to implementation techniques corresponding to internal DSLs. We contribute a technique based on internal DSLs, and demonstrate a web application implemented with our technique.

关键词： Domain-specific language (DSL) Web application Von Neumann architecture

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Reticle: A Virtual Machine for programming Modern FPGAs 2021

Reticle: A Virtual Machine for Programming Modern FPGAs

引用

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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Unfold/fold transformations and loop optimization of logic programs 88

Unfold/fold transformations and loop optimization of logic p...

引用

acm sigplan conference on programming language design and implementation, PLDI 1988

作者： Debray, Saumya K. Department of Computer Science University of Arizona TucsonAZ85721 United States

ISBN: (纸本)0897912691

Programs typically spend much of their execution time in loops. This makes the generation of efficient code for loops essential for good performance. Loop optimization of logic programming languages is complicated by the fact that such languages lack the iterative constructs of traditional languages, and instead use recursion to express loops. In this paper, we examine the application of unfold/fold transformations to three kinds of loop optimization for logic programming languages: recursion removal, loop fusion and code motion out of loops. We describe simple unfold/fold transformation sequences for these optimizations that can be automated relatively easily. In the process, we show that the properties of unification and logical variables can sometimes be used to generalize, from traditional languages, the conditions under which these optimizations may be carried out. Our experience suggests that such source-level transformations may he used as an effective tool for the optimization of logic programs. © 1988 acm.

关键词： Logic programming

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An experimental analysis of self-adjusting computation 06

An experimental analysis of self-adjusting computation

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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： Acar, Umut A. Blelloch, Guy E. Blume, Matthias Tangwongsan, Kanat Toyota Technological Institute Japan Carnegie Mellon University United States

ISBN: (纸本)1595933743

Dependence graphs and memoization can be used to efficiently update the output of a program as the input changes dynamically. Recent work has studied techniques for combining these approaches to effectively dynamize a wide range of applications. Toward this end various theoretical results were given. In this paper we describe the implementation of a library based on these ideas, and present experimental results on the efficiency of this library on a variety of applications. The results of the experiments indicate that the approach is effective in practice, often requiring orders of magnitude less time than recomputing the output from scratch. We believe this is the first experimental evidence that incremental computation of any type is effective in practice for a reasonably broad set of applications. Copyright © 2006 acm.

关键词： Dynamic programming

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Multi-modal Synthesis of Regular Expressions 2020

Multi-modal Synthesis of Regular Expressions

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41st acm sigplan conference on programming language design and implementation (PLDI)

作者： Chen, Qiaochu Wang, Xinyu Ye, Xi Durrett, Greg Dillig, Isil Univ Texas Austin Austin TX 78712 USA Univ Michigan Ann Arbor MI 48109 USA

ISBN: (纸本)9781450376136

In this paper, we propose a multi-modal synthesis technique for automatically constructing regular expressions (regexes) from a combination of examples and natural language. Using multiple modalities is useful in this context because natural language alone is often highly ambiguous, whereas examples in isolation are often not sufficient for conveying user intent. Our proposed technique first parses the English description into a so-called hierarchical sketch that guides our programming-by-example (PBE) engine. Since the hierarchical sketch captures crucial hints, the PBE engine can leverage this information to both prioritize the search as well as make useful deductions for pruning the search space. We have implemented the proposed technique in a tool called Regel and evaluate it on over three hundred regexes. Our evaluation shows that Regel achieves 80% accuracy whereas the NLP-only and PBE-only baselines achieve 43% and 26% respectively. We also compare our proposed PBE engine against an adaptation of AlphaRegex, a state-of-the-art regex synthesis tool, and show that our proposed PBE engine is an order of magnitude faster, even if we adapt the search algorithm of AlphaRegex to leverage the sketch. Finally, we conduct a user study involving 20 participants and show that users are twice as likely to successfully come up with the desired regex using Regel compared to without it.

关键词： Program Synthesis programming by Natural languages programming by Example Regular Expression

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Kill-safe synchronization abstractions

Kill-safe synchronization abstractions

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

作者： Flatt, Matthew Findler, Robert Bruce University of Utah United States University of Chicago United States

When an individual task can be forcefully terminated at any time, cooperating tasks must communicate carefully. For example, if two tasks share an object, and if one task is terminated while it manipulates the object, the object may remain in an inconsistent or frozen state that incapacitates the other task. To support communication among terminable tasks, language run-time systems (and operating systems) provide kill-safe abstractions for inter-task communication. No kill-safe guarantee is available, however, for abstractions that are implemented outside the run-time system. In this paper, we show how a run-time system can support new kill-safe abstractions without requiring modification to the run-time system, and without requiring the run-time system to trust any new code. Our design frees the run-time implementor to provide only a modest set of synchronization primitives in the trusted computing base, while still allowing tasks to communicate using sophisticated abstractions.

关键词： Computer programming languages

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Efficient Late Binding of Dynamic Function Compositions 12

Efficient Late Binding of Dynamic Function Compositions

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12th acm sigplan International conference on Software language Engineering (SLE)

作者： Schuetze, Lars Castrillon, Jeronimo Tech Univ Dresden Chair Compiler Construct Dresden Germany

ISBN: (纸本)9781450369817

Adaptive software becomes more and more important as computing is increasingly context-dependent. Runtime adaptability can be achieved by dynamically selecting and applying context-specific code. Role-oriented programming has been proposed as a paradigm to enable runtime adaptive software by design. Roles change the objects' behavior at runtime and thus allow adapting the software to a given context. However, this increased variability and expressiveness has a direct impact on performance and memory consumption. We found a high overhead in the steady-state performance of executing compositions of adaptations. This paper presents a new approach to use run-time information to construct a dispatch plan that can be executed efficiently by the JVM. The concept of late binding is extended to dynamic function compositions. We evaluated the implementation with a benchmark for role-oriented programming languages leveraging context-dependent role semantics achieving a mean speedup of 2.79x over the regular implementation.

关键词： Role-Oriented programming Dispatch Optimization Virtual Machine

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Speculative Separation for Privatization and Reductions 12

Speculative Separation for Privatization and Reductions

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33rd acm sigplan conference on programming language design and implementation

作者： Johnson, Nick P. Kim, Hanjun Prabhu, Prakash Zaks, Ayal August, David I. Princeton Univ Princeton NJ 08544 USA Intel Corp Haifa Israel

ISBN: (纸本)9781450312059

Automatic parallelization is a promising strategy to improve application performance in the multicore era. However, common programming practices such as the reuse of data structures introduce artificial constraints that obstruct automatic parallelization. Privatization relieves these constraints by replicating data structures, thus enabling scalable parallelization. Prior privatization schemes are limited to arrays and scalar variables because they are sensitive to the layout of dynamic data structures. This work presents Privateer, the first fully automatic privatization system to handle dynamic and recursive data structures, even in languages with unrestricted pointers. To reduce sensitivity to memory layout, Privateer speculatively separates memory objects. Privateer's lightweight runtime system validates speculative separation and speculative privatization to ensure correct parallel execution. Privateer enables automatic parallelization of general-purpose C/C++ applications, yielding a geomean whole-program speedup of 11.4x over best sequential execution on 24 cores, while non-speculative parallelization yields only 0.93x.

关键词： languages Performance design Experimentation Automatic parallelization Separation Speculation

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