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检索条件"任意字段=ACM SIGPLAN Conference on Programming Language Design and Implementation, PLDI 1988"

共 918 条记录，以下是911-920 订阅

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Incremental analysis of real programming languages 97

Incremental analysis of real programming languages

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Proceedings of the acm sigplan 1997 conference on programming language design and implementation

作者： Tim A. Wagner Susan L. Graham University of California Berkeley

ISBN: (纸本)9780897919074

A major research goal for compilers and environments is the automatic derivation of tools from formal specifications. However, the formal model of the language is often inadequate; in particular, LR(k) grammars are unable to describe the natural syntax of many languages, such as C++ and Fortran, which are inherently non-deterministic. designers of batch compilers work around such limitations by combining generated components with ad hoc techniques (for instance, performing partial type and scope analysis in tandem with parsing). Unfortunately, the complexity of incremental systems precludes the use of batch solutions. The inability to generate incremental tools for important languages inhibits the widespread use of language-rich interactive *** address this problem by extending the language model itself, introducing a program representation based on parse dags that is suitable for both batch and incremental analysis. Ambiguities unresolved by one stage are retained in this representation until further stages can complete the analysis, even if the reaolution depends on further actions by the user. Representing ambiguity explicitly increases the number and variety of languages that can be analyzed incrementally using existing *** create this representation, we have developed an efficient incremental parser for general context-free grammars. Our algorithm combines Tomita's generalized LR parser with reuse of entire subtrees via state-matching. Disambiguation can occur statically, during or after parsing, or during semantic analysis (using existing incremental techniques); program errors that preclude disambiguation retsin multiple interpretations indefinitely. Our representation and analyses gain efficiency by exploiting the local nature of ambiguities: for the SPEC95 C programs, the explicit representation of ambiguity requires only 0.5% additional space and less than 1% additional time during reconstruction.

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Incrementalization across object abstraction 05

Incrementalization across object abstraction

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Proceedings of the 20th annual acm sigplan conference on Object-oriented programming, systems, languages, and applications

作者： Yanhong A. Liu Scott D. Stoller Michael Gorbovitski Tom Rothamel Yanni Ellen Liu State University of New York at Stony Brook Stony Brook NY University of Manitoba Winnipeg MB Canada

ISBN: (纸本)9781595930316

Object abstraction supports the separation of what operations are provided by systems and components from how the operations are implemented, and is essential in enabling the construction of complex systems from components. Unfortunately, clear and modular implementations have poor performance when expensive query operations are repeated, while efficient implementations that incrementally maintain these query results are much more difficult to develop and to understand, because the code blows up significantly, and is no longer clear or *** paper describes a powerful and systematic method that first allows the "what" of each component to be specified in a clear and modular fashion and implemented straightforwardly in an object-oriented language; then analyzes the queries and updates, across object abstraction, in the straightforward implementation; and finally derives the sophisticated and efficient "how" of each component by incrementally maintaining the results of repeated expensive queries with respect to updates to their parameters. Our implementation and experimental results for example applications in query optimization, role-based access control, etc. demonstrate the effectiveness and benefit of the method.

关键词： program analysis design invariants program optimization incrementalization object-oriented abstraction program transformation

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Featherweight Java: a minimal core calculus for Java and GJ 99

Featherweight Java: a minimal core calculus for Java and GJ

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Proceedings of the 14th acm sigplan conference on Object-oriented programming, systems, languages, and applications

作者： Atshushi Igarashi Benjamin Pierce Philip Wadler Dept. of Comp. & Info. Sci. University of Pennsylvania Bell Laboratories Lucent Technologies

ISBN: (纸本)9781581132380

Several recent studies have introduced lightweight versions of Java: reduced languages in which complex features like threads and reflection are dropped to enable rigorous arguments about key properties such as type safety. We carry this process a step further, omitting almost all features of the full language (including interfaces and even assignment) to obtain a small calculus, Featherweight Java, for which rigorous proofs are not only possible but *** Java bears a similar relation to full Java as the lambda-calculus does to languages such as ML and Haskell. It offers a similar computational “feel,” providing classes, methods, fields, inheritance, and dynamic typecasts, with a semantics closely following Java's. A proof of type safety for Featherweight Java thus illustrates many of the interesting features of a safety proof for the full language, while remaining pleasingly compact. The syntax, type rules, and operational semantics of Featherweight Java fit on one page, making it easier to understand the consequences of extensions and *** an illustration of its utility in this regard, we extend Featherweight Java with generic classes in the style of GJ (Bracha, Odersky, Stoutamire, and Wadler) and sketch a proof of type safety. The extended system formalizes for the first time some of the key features of GJ.

关键词： language design implementation theoretical foundations

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Halide: a language and compiler for optimizing parallelism, locality, and recomputation in image processing pipelines 13

Halide: a language and compiler for optimizing parallelism, ...

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Proceedings of the 34th acm sigplan conference on programming language design and implementation

作者： Jonathan Ragan-Kelley Connelly Barnes Andrew Adams Sylvain Paris Frédo Durand Saman Amarasinghe Massachusetts Institute of Technology Cambridge MA USA Adobe Cambridge MA USA

ISBN: (纸本)9781450320146

Image processing pipelines combine the challenges of stencil computations and stream programs. They are composed of large graphs of different stencil stages, as well as complex reductions, and stages with global or data-dependent access patterns. Because of their complex structure, the performance difference between a naive implementation of a pipeline and an optimized one is often an order of magnitude. Efficient implementations require optimization of both parallelism and locality, but due to the nature of stencils, there is a fundamental tension between parallelism, locality, and introducing redundant recomputation of shared *** present a systematic model of the tradeoff space fundamental to stencil pipelines, a schedule representation which describes concrete points in this space for each stage in an image processing pipeline, and an optimizing compiler for the Halide image processing language that synthesizes high performance implementations from a Halide algorithm and a schedule. Combining this compiler with stochastic search over the space of schedules enables terse, composable programs to achieve state-of-the-art performance on a wide range of real image processing pipelines, and across different hardware architectures, including multicores with SIMD, and heterogeneous CPU+GPU execution. From simple Halide programs written in a few hours, we demonstrate performance up to 5x faster than hand-tuned C, intrinsics, and CUDA implementations optimized by experts over weeks or months, for image processing applications beyond the reach of past automatic compilers.

关键词： autotuning parallelism locality compiler vectorization gpu redundant computation optimization domain specific language image processing

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Lightweight object-oriented shared variables for distributed applications on the Internet 98

Lightweight object-oriented shared variables for distributed...

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Proceedings of the 13th acm sigplan conference on Object-oriented programming, systems, languages, and applications

作者： Jacob Harris Vivek Sarkar Massachusetts Institute of Technology IBM T. J. Watson Research Center

ISBN: (纸本)9781581130058

This paper describes a lightweight yet powerful approach for writing distributed applications using shared variables. Our approach, called SHAREHOLDER, is inspired by the flexible and intuitive model of information access common to the World Wide Web. The distributed applications targeted by our approach all share a weak consistency model and loose transaction semantics, similar to a user's model of accessing email, bulletin boards, chat rooms, etc. on the Internet. The SHAREHOLDER infrastructure has several advantages. Its highly object-oriented view of shared variables simplifies their initialization and configuration. A shared variable's distribution mechanism is specified through an associated configuration object, and the programmer does not need to write any extra code to implement the sharing mechanism. These configuration objects can be initialized at run-time, allowing tremendous flexibility in dynamic control of distribution of shared variables. Finally, the programmer can treat shared variables and local variables interchangeably, thus simplifying conversion of a serial application into a distributed application.

关键词： language design and implementation persistence world wide web distributed and parallel systems

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Finding application errors and security flaws using PQL: a program query language 05

Finding application errors and security flaws using PQL: a p...

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Proceedings of the 20th annual acm sigplan conference on Object-oriented programming, systems, languages, and applications

作者： Michael Martin Benjamin Livshits Monica S. Lam Stanford University

ISBN: (纸本)9781595930316

A number of effective error detection tools have been built in recent years to check if a program conforms to certain design rules. An important class of design rules deals with sequences of events asso-ciated with a set of related objects. This paper presents a language called PQL (Program Query language) that allows programmers to express such questions easily in an application-specific context. A query looks like a code excerpt corresponding to the shortest amount of code that would violate a design rule. Details of the tar-get application's precise implementation are abstracted away. The programmer may also specify actions to perform when a match is found, such as recording relevant information or even correcting an erroneous execution on the *** have developed both static and dynamic techniques to find solutions to PQL queries. Our static analyzer finds all potential matches conservatively using a context-sensitive, flow-insensitive, inclusion-based pointer alias analysis. Static results are also use-ful in reducing the number of instrumentation points for dynamic analysis. Our dynamic analyzer instruments the source program to catch all violations precisely as the program runs and to optionally perform user-specified *** have implemented the techniques described in this paper and found 206 errors in 6 large real-world open-source Java applica-tions containing a total of nearly 60,000 classes. These errors are important security flaws, resource leaks, and violations of consis-tency invariants. The combination of static and dynamic analysis proves effective at addressing a wide range of debugging and pro-gram comprehension queries. We have found that dynamic analysis is especially suitable for preventing errors such as security vulner-abilities at runtime.

关键词： bug finding resource leaks pattern matching SQL injection web applications program traces

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A generational on-the-fly garbage collector for Java 00

A generational on-the-fly garbage collector for Java

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Proceedings of the acm sigplan 2000 conference on programming language design and implementation

作者： Tamar Domani Elliot K. Kolodner Erez Petrank IBM Haifa Research Lab. Computer Science Dept. Technion - Israel Institute of Technology

ISBN: (纸本)9781581131994

An on-the-fly garbage collector does not stop the program threads to perform the collection. Instead, the collector executes in a separate thread (or process) in parallel to the program. On-the-fly collectors are useful for multi-threaded applications running on multiprocessor servers, where it is important to fully utilize all processors and provide even response time, especially for systems for which stopping the threads is a costly operation. In this work, we report on the incorporation of generations into an on-the-fly garbage collector. The incorporation is non-trivial since an on-the-fly collector avoids explicit synchronization with the program threads. To the best of our knowledge, such an incorporation has not been tried before. We have implemented the collector for a prototype Java Virtual Machine on AIX, and measured its performance on a 4-way *** for other generational collectors, an on-the-fly generationalcollector has the potential for reducing the overall running time and working set of an application by concentrating collection efforts on the young objects. However, in contrast to other generational collectors,on-the-fly collectors do not move the objects; thus, there is no segregation between the old and the young objects. Furthermore, on-the-fly collectors do not stop the threads, so there is no extra benefit for the short pauses obtained by generational collection. Nevertheless, comparing our on-the-fly collector with and without generations, it turns out that the generational collector performs better for most applications. The best reduction in overall running time for the benchmarks we measured was 25%. However, there were some benchmarks for which it had no effect and one for which the overall running time increased by 4%.

关键词： memory management generational garbage collection programming languages garbage collection

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Load-reuse analysis: design and evaluation 99

Load-reuse analysis: design and evaluation

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Proceedings of the acm sigplan 1999 conference on programming language design and implementation

作者： Rastislav Bodík Rajiv Gupta Mary Lou Soffa Dept. of Computer Science University of Pittsburgh Pittsburgh PA

ISBN: (纸本)9781581130942

Load-reuse analysis finds instructions that repeatedly access the same memory location. This location can be promoted to a register, eliminating redundant loads by reusing the results of prior memory accesses. This paper develops a load-reuse analysis and designs a method for evaluating its *** designing the analysis, we aspire for completeness---the goal of exposing all reuse that can be harvested by a subsequent program transformation. For register promotion, a suitable transformation is partial redundancy elimination (PRE). To approach the ideal goal of PRE-completeness, the load-reuse analysis is phrased as a data-flow problem on a program representation that is path-sensitive, as it detects reuse even when it originates in a different instruction along each control flow path. Furthermore, the analysis is comprehensive, as it treats scalar, array and pointer-based loads *** evaluating the analysis, we compare it with an ideal analysis. By observing the run-time stream of memory references, we collect all PRE-exploitable reuse and treat it as the ideal analysis performance. To compare the (static) load-reuse analysis with the (dynamic) ideal reuse, we use an estimator algorithm that computes, given a data-flow solution and a program profile, the dynamic amount of reuse detected by the analysis. We developed a family of estimators that differ in how well they bound the profiling error inherent in the edge profile. By bounding the error, the estimators offer a precise and practical method for determining the run-time optimization *** experiments show that about 55% of loads executed in Spec95 exhibit reuse. Of those, our analysis exposes about 80%.

关键词： register promotion program representations data-flow analysis profile-guided optimizations

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