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检索条件"任意字段=Proceedings of the ACM SIGPLAN 2002 conference on Programming language design and implementation"

共 1259 条记录，以下是481-490 订阅

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Trace-based Just-in-Time Type Specialization for Dynamic languages 09

Trace-based Just-in-Time Type Specialization for Dynamic Lan...

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acm sigplan conference on programming language design and implementation

作者： Gal, Andreas Eich, Brendan Shaver, Mike Anderson, David Mandelin, David Haghighat, Mohammad R. Kaplan, Blake Hoare, Graydon Zbarsky, Boris Orendorff, Jason Ruderman, Jesse Smith, Edwin Reitmaier, Rick Bebenita, Michael Chang, Mason Franz, Michael Intel Corp Santa Clara CA 95051 USA Univ Calif Irvine Irvine CA USA

ISBN: (纸本)9781605583921

Dynamic languages such as JavaScript are more difficult to compile than statically typed ones. Since no concrete type information is available, traditional compilers need to emit generic code that can handle all possible type combinations at runtime. We present an alternative compilation technique for dynamically-typed languages that identifies frequently executed loop traces at run-time and then generates machine code on the fly that is specialized for the actual dynamic types occurring on each path through the loop. Our method provides cheap inter-procedural type specialization, and an elegant and efficient way of incrementally compiling lazily discovered alternative paths through nested loops. We have implemented a dynamic compiler for JavaScript based on our technique and we have measured speedups of 10x and more for certain benchmark programs.

关键词： design Experimentation Measurement Performance JavaScript just-in-time compilation trace trees

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Executing Code in the Past: Efficient In-Memory Object Graph Versioning 09

Executing Code in the Past: Efficient In-Memory Object Graph...

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24th Annual acm conference on Object-Oriented programming, Systems, languages and Applications

作者： Pluquet, Frederic Langerman, Stefan Wuyts, Roel Univ Libre Bruxelles Dept Comp Sci Fac Sci Brussels Belgium

ISBN: (纸本)9781605587349

Object versioning refers to how an application can have access to previous states of its objects Implementing this mechanism is hard because it needs to be efficient in space and time, and well integrated with the programming language. This paper presents HistOOry, an object versioning system that uses an efficient data structure to store and retrieve past states. It needs only three primitives, and existing code does not need to be modified to be versioned It provides fine-grained control over what parts of objects are versioned and when It stores all states, past and present, in memory. Code can be executed in the past of the system and will see the complete system at that point in time. We have implemented our model in Smalltalk and used it for three applications that need versioning: checked postconditions, stateful execution tracing and a planar point location implementation. Benchmarks are provided to asses the practical complexity of our implementation.

关键词： Object Versioning Object-oriented programming language design

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An Integrated Proof language for Imperative Programs 09

An Integrated Proof Language for Imperative Programs

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acm sigplan conference on programming language design and implementation

作者： Zee, Karen Kuncak, Viktor Rinard, Martin C. CSAIL MIT Cambridge MA USA Ecole Polytech Fed Lausanne IC Lausanne VD Switzerland

ISBN: (纸本)9781605583921

We present an integrated proof language for guiding the actions of multiple reasoning systems as they work together to prove complex correctness properties of imperative programs. The language operates in the context of a program verification system that uses multiple reasoning systems to discharge generated proof obligations. It is designed to 1) enable developers to resolve key choice points in complex program correctness proofs, thereby enabling automated reasoning systems to successfully prove the desired correctness properties;2) allow developers to identify key lemmas for the reasoning systems to prove, thereby guiding the reasoning systems to find an effective proof decomposition;3) enable multiple reasoning systems to work together productively to prove a single correctness property by providing a mechanism that developers can use to divide the property into lemmas, each of which is suitable for a different reasoning system;and 4) enable developers to identify specific lemmas that the reasoning systems should use when attempting to prove other lemmas or correctness properties, thereby appropriately confining the search space so that the reasoning systems can find a proof in an acceptable amount of time. The language includes a rich set of declarative proof constructs that enables developers to direct the reasoning systems as little or as much as they desire. Because the declarative proof statements are embedded into the program as specialized comments, they also serve as verified documentation and are a natural extension of the assertion mechanism found in most program verification systems. We have implemented our integrated proof language in the context of a program verification system for Java and used the resulting system to verify a collection of linked data structure implementations. Our experience indicates that our proof language makes it possible to successfully prove complex program correctness properties that are otherwise beyond the reach of autom

关键词： Algorithms languages Reliability Verification verification theorem prover proof system

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PetaBricks: A language and Compiler for Algorithmic Choice 09

PetaBricks: A Language and Compiler for Algorithmic Choice

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acm sigplan conference on programming language design and implementation

作者： Ansel, Jason Chan, Cy Wong, Yee Lok Olszewski, Marek Zhao, Qin Edelman, Alan Amarasinghe, Saman MIT Comp Sci & Artificial Intelligence Lab Cambridge MA 02139 USA

ISBN: (纸本)9781605583921

It is often impossible to obtain a one-size-fits-all solution for high performance algorithms when considering different choices for data distributions, parallelism, transformations, and blocking. The best solution to these choices is often tightly coupled to different architectures, problem sizes, data, and available system resources. In some cases, completely different algorithms may provide the best performance. Current compiler and programming language techniques are able to change some of these parameters, but today there is no simple way for the programmer to express or the compiler to choose different algorithms to handle different parts of the data. Existing solutions normally can handle only coarse-grained, library level selections or hand coded cutoffs between base cases and recursive cases. We present PetaBricks, a new implicitly parallel language and compiler where having multiple implementations of multiple algorithms to solve a problem is the natural way of programming. We make algorithmic choice a first class construct of the language. Choices are provided in a way that also allows our compiler to tune at a finer granularity. The PetaBricks compiler autotunes programs by making both fine-grained as well as algorithmic choices. Choices also include different automatic parallelization techniques, data distributions, algorithmic parameters, transformations, and blocking. Additionally, we introduce novel techniques to autotune algorithms for different convergence criteria. When choosing between various direct and iterative methods, the PetaBricks compiler is able to tune a program in such a way that delivers near-optimal efficiency for any desired level of accuracy. The compiler has the flexibility of utilizing different convergence criteria for the various components within a single algorithm, providing the user with accuracy choice alongside algorithmic choice.

关键词： Algorithms languages Performance

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implementation of the Memory-safe Full ANSI-C Compiler 09

Implementation of the Memory-safe Full ANSI-C Compiler

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acm sigplan conference on programming language design and implementation

作者： Oiwa, Yutaka Natl Inst Adv Ind Sci & Technol Res Ctr Informat Secur RCIS Tokyo Japan

ISBN: (纸本)9781605583921

This paper describes a completely memory-safe compiler for C language programs that is fully compatible with the ANSI C specification. Programs written in C often suffer from nasty errors due to dangling pointers and buffer overflow. Such errors in Internet server programs are often exploited by malicious attackers to crack an entire system. The origin of these errors is usually corruption of in-memory data structures caused by out-of-bound array accesses. Usual C compilers do not provide any protection against such out-of-bound access, although many other languages such as Java and ML do provide such protection. There have been several proposals for preventing such memory corruption from various aspects: runtime buffer overrun detectors, designs for new C-like languages, and compilers for (subsets of) the C language. However, as far as we know, none of them have achieved full memory protection and full compatibility with the C language specification at the same time. We propose the most powerful solution to this problem ever presented. We have developed Fail-Safe C, a memory-safe implementation of the full ANSI C language. It detects and disallows all unsafe operations, yet conforms to the full ANSI C standard (including casts and unions). This paper introduces several techniques-both compile-time and runtime-to reduce the overhead of runtime checks, while still maintaining 100% memory safety. This compiler lets programmers easily make their programs safe without heavy rewriting or porting of their code. It also supports many of the "dirty tricks" commonly used in many existing C programs, which do not strictly conform to the standard specification. In this paper, we demonstrate several real-world server programs that can be processed by our compiler and present technical details and benchmark results for it.

关键词： Memory Safety C language

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A Study of Memory Management for Web-based Applications on Multicore Processors 09

A Study of Memory Management for Web-based Applications on M...

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acm sigplan conference on programming language design and implementation

作者： Inoue, Hiroshi Komatsu, Hideaki Nakatani, Toshio IBM Tokyo Res Lab Yamato Kanagawa 2428502 Japan

ISBN: (纸本)9781605583921

More and more server workloads are becoming Web-based. In these Web-based workloads, most of the memory objects are used only during one transaction. We study the effect of the memory management approaches on the performance of such Web-based applications on two modern multicore processors. In particular, using six PHP applications, we compare a general-purpose allocator (the default allocator of the PHP runtime) and a region-based allocator, which can reduce the cost of memory management by not supporting per-object free. The region-based allocator achieves better performance for all workloads on one processor core due to its smaller memory management cost. However, when using eight cores, the region-based allocator suffers from hidden costs of increased bus traffics and the performance is reduced for many workloads by as much as 27.2% compared to the default allocator. This is because the memory bandwidth tends to become a bottleneck in systems with multicore processors. We propose a new memory management approach, defrag-dodging, to maximize the performance of the Web-based workloads on multicore processors. In our approach, we reduce the memory management cost by avoiding defragmentation overhead in the malloc and free functions during a transaction. We found that the transactions in Web-based applications are short enough to ignore heap fragmentation, and hence the costs of the defragmentation activities in existing general-purpose allocators outweigh their benefits. By comparing our approach against the region-based approach, we show that a per-object free capability can reduce bus traffic and achieve higher performance on multicore processors. We demonstrate that our defrag-dodging approach improves the performance of all the evaluated applications on both processors by up to 11.4% and 51.5% over the default allocator and the region-based allocator, respectively.

关键词： Dynamic memory management Region-based memory management Scripting language Web-based applications

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A different kind of programming languages course

A different kind of programming languages course

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OOPSLA 2009 Companion - 24th Annual acm conference on Object-Oriented programming, Systems, languages and Applications, OOPSLA 2009

作者： Yeager, Dorian P. Grove City College Grove City PA United States

ISBN: (纸本)9781605587660

The complexity of the well-explored regions of the programming language design space has increased substantially in the last twenty-five years with the addition of a large number of object-oriented programming languages (OOPLs). This design domain was already known to be large and complex before OOPLs came on the scene, and many offerings of the standard programming languages course before that time did not even mention the object-oriented programming (OOP) paradigm. Now that OOP has become mainstream, undergraduate programs which include a course on programming language design and implementation have responded by expanding their existing course or by jettisoning some of the alternative ideas in favor of expanded coverage of OOPLs. There are two facts, however, which must be confronted as we consider what information we would like to pass on to our students in this fascinating area of our discipline. The first is that the design space represented by OOPLs is large enough to justify a separate course, and the second is that a large number of ideas from other language paradigms appear in subsets of well-known languages for OOP. This paper presents a course in the design and implementation of programming languages that (as OOP itself did in the late eighties) turns some accepted notions "inside out" by proposing that the entire course be presented from the OOP point of view. Such a course has been offered by Grove City College for a decade and has matured into a very effective means of communicating essential programming language design and implementation ideas to our students. The course could be offered as the only advanced course in the area, as one course in a two-semester sequence, or as an alternative to the traditional course. Copyright © 2009 acm.

关键词： Object oriented programming

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Effective Interactive Proofs for Higher-Order Imperative Programs

Effective Interactive Proofs for Higher-Order Imperative Pro...

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14th acm sigplan International conference on Functional programming

作者： Chlipala, Adam Malecha, Gregory Morrisett, Greg Shinnar, Avraham Wisnesky, Ryan Harvard Univ Cambridge MA 02138 USA

ISBN: (纸本)9781605583327

We present a new approach for constructing and verifying higher-order, imperative programs using the Coq proof assistant. We build on the past work on the Ynot system, which is based on Hoare Type Theory. That original system was a proof of concept, where every program verification was accomplished via laborious manual proofs, with much code devoted to uninteresting low-level details. In this paper, we present a re-implementation of Ynot which makes it possible to implement fully-verified, higher-order imperative programs with reasonable proof burden. At the same time, our new system is implemented entirely in Coq source files, showcasing the versatility of that proof assistant as a platform for research on language design and verification. Both versions of the system have been evaluated with case studies in the verification of imperative data structures, such as hash tables with higher-order iterators. The verification burden in our new system is reduced by at least an order of magnitude compared to the old system, by replacing manual proof with automation. The core of the automation is a simplification procedure for implications in higher-order separation logic, with hooks that allow programmers to add domain-specific simplification rules. We argue for the effectiveness of our infrastructure by verifying a number of data structures and a packrat parser, and we compare to similar efforts within other projects. Compared to competing approaches to data structure verification, our system includes much less code that must be trusted;namely, about a hundred lines of Coq code defining a program logic. All of our theorems and decision procedures have or build machine-checkable correctness proofs from first principles, removing opportunities for tool bugs to create faulty verifications.

关键词： functional programming interactive proof assistants dependent types separation logic

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Multiparadigm programming in Object-Oriented languages: Current Research Report on the Workshop MPOOL'08 at ECOOP 2008

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22nd European conference on Object-Oriented programming (ECOOP 2008)

作者： Striegnitz, Joerg Davis, Kei Univ Appl Sci Regensburg D-93053 Regensburg Germany Los Alamos Natl Lab Los Alamos 87545 NM USA

ISBN: (纸本)9783642020469

While OO has, become ubiquitously employed for design;implementation, and even conceptualization, many practitioners recognize the concomitant need for other programming paradigms according to problem domain. Nevertheless, the choice of a programming paradigm is strongly influenced by the supporting programming language facilities. In turn, choice of programming language is usually highly constrained by practical considerations. We seek answers to the question of how to address the need for other programming paradigms, or even domain specific languages, in the general context of OO languages. It is clear that this field is active and fluid: novel, disparate approaches' and techniques are still being discovered or invented, And this very novelty adds a. significant element of intellectual entertainment. This article describes the cross section of research efforts reported at the, workshop on Multiparadigm programming in Object-Oriented languages held at, the 2008 European conference on Object-Oriented programming.

关键词： C# 3.0 CLOS Closures Delegates design patterns Eiffel Extension methods Function objects Functional programming Java 7 Multiparadigm programming Object-oriented programming OCaml Open classes Scala Smalltalk

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Extending AOP with Models 09

Extending AOP with Models

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2nd India Software Engineering conference

作者： Kulkarni, Vinay Reddy, Sreedhar Tata Res Dev & Design Ctr Pune Maharashtra India

ISBN: (纸本)9781605584263

Aspect-oriented programming is a promising approach to address separation of concerns. Aspect-oriented programming languages address the problems of scattering and entanglement by providing an abstraction for specifying cross-cutting concerns in a modular manner. The relevant aspects are then composed to derive the desired implementation. However, current aspect-oriented programming languages only allow this composition to be specified in terms of programming language constructs. This is restrictive and can only be used for simple compositions. Many situations in practice need a richer composition context that cannot be expressed using programming language constructs. Models, being at a higher level of abstraction and closer to the problem domain, can be used to capture this information. We propose an approach to extend aspect-oriented programming with a composition mechanism that can make use of the information captured in models. We also outline an implementation of the proposed approach. The proposed approach has been used to seamlessly integrate model-centric and code-centric development.

关键词： Aspect-oriented programming Point-cut extension Models

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