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Proceedings of the Twelfth Annual International Computer Software & applications conference (COMPSAC 88)

作者： Gupta, A. Fuchs, W.K. Univ of Illinois Urbana IL USA

ISBN: (纸本)0818608730

The authors examine the problem of reliable storage reclamation in a distributed object-oriented system. A distributed algorithm is proposed that utilizes a modified reference counting strategy for intermode pointers and mark-and-sweep for local garbage collection. The algorithm allows nodes to fail in a failstop manner, in which case the global garbage collection functions in a gracefully degraded mode of operation. Compaction of objects is supported and object locality is exploited to reduce overhead.

关键词： COMPUTER programming

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A foundation for evolution from relational to object databases 1st

A foundation for evolution from relational to object databas...

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1st International conference on Extending Database Technology, EDBT 1988

作者： Beech, David Hewlett-Packard Laboratories 1501 Page Mill Road Palo AltoCA94304 United States

ISBN: (纸本)9783540190745

object models have an important part to play in the future of database systems, but progress is hampered by lack of agreement on their essential characteristics. Strong constraints on the design of a common model are exercised by the need to interface well with object models in programming languages, and the desirability of a smooth evolution from existing database technology. This paper briefly reviews some salient features of database and language object concepts, and then draws attention to a correspondence between relational and object database models. It shows how this can be exploited in defining object SQL (OSQL), which reinterprets and extends SQL to define object types and instances, together with functions which relate and manipulate objects. OSQL has been implemented as an interface to the Iris object DBMS. © 1988, Springer-Verlag.

关键词： object-oriented databases

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Finding resume and restart errors in android applications 2016

Finding resume and restart errors in android applications

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2016 ACM SIGPLAN International conference on object-oriented programming, systems, languages, and applications, oopsla 2016

作者： Shan, Zhiyong Azim, Tanzirul Neamtiu, Iulian School of Computer Science and Mathematics University of Central Missouri WarrensburgMO64093 United States Department of Computer Science and Engineering University of California RiversideCA92521 United States Department of Computer Science New Jersey Institute of Technology NewarkNJ07102 United States

ISBN: (纸本)9781450344449

Smartphone apps create and handle a large variety of "instance" data that has to persist across runs, such as the current navigation route, workout results, antivirus settings, or game state. Due to the nature of the smartphone platform, an app can be paused, sent into background, or killed at any time. If the instance data is not saved and restored between runs, in addition to data loss, partially-saved or corrupted data can crash the app upon resume or restart. While smartphone platforms offer API support for data-saving and data-retrieving operations, the use of this API is ad-hoc: left to the programmer, rather than enforced by the compiler. We have observed that several categories of bugs-including data loss, failure to resume/restart or resuming/restarting in the wrong state-are due to incorrect handling of instance data and are easily triggered by just pressing the 'Home' or 'Back' buttons. To help address this problem, we have constructed a tool chain for Android (the KRE finder static analysis and the KREreproducer input generator) that helps find and reproduce such incorrect handling. We have evaluated our approach by running the static analysis on 324 apps, of which 49 were further analyzed manually. Results indicate that our approach is (i) effective, as it has discovered 49 bugs, including in popular Android apps, and (ii) efficient, completing on average in 61 seconds per app. More generally, our approach helps determine whether an app saves too much or too little state. © 2016 ACM.

关键词： Application programs

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OrcO: A Concurrency-First Approach to objects

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ACM SIGPLAN NOTICES 2016年第10期51卷 548-567页

作者： Peters, Arthur Michener Kitchin, David Thywissen, John A. Cook, William R. Univ Texas Austin Austin TX 78712 USA Google Inc Mountain View CA USA

The majority of modern programming languages provide concurrency and object-orientation in some form. However, object-oriented concurrency remains cumbersome in many situations. We introduce the language OrcO, Orc with concurrent objects, which enables a flexible style of concurrent object-oriented programming. OrcO extends the Orc programming language by adding abstractions for programming-in-the-large;namely objects, classes, and inheritance. OrcO objects are designed to be orthogonal to concurrency, allowing the concurrent structure and object structure of a program to evolve independently. This paper describes OrcO's goals and design and provides examples of how OrcO can be used to deftly handle events, object management, and object composition.

关键词： Composition futures language design mixin inheritance object supervision Orc

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A global object name space for the intel hypercube 3

A global object name space for the intel hypercube

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3rd conference on Hypercube Concurrent Computers and applications, C3P 1988

作者： Bain, William L. Block Island Technologies United States

ISBN: (纸本)0897912780

The Intel iPSC® and iPSC®/2 concurrent computer systems provide the processing power and memory to solve very large parallel programming problems. However, their distributed memory and large grain process model complicate the implementation of object oriented programs. As part of the Interwork II™ Concurrent programming Toolkit, software facilities have been constructed for the management of a large number of objects (up to 2∗∗32) in a global object name space. This simplifies the iPSC's programming model by allowing uniform access to objects from any node within the hypercube. objects are dynamically created and destroyed, and two methods of object access are provided. First, a process can gain exclusive access to an object using the Openjobj procedure;the object migrates to the process's local node as a side effect. A second and more efficient access method is to execute one of an object's associated procedures using the Apply procedure. The current implementation transports the procedure name and arguments to the node on which the object resides for execution;a copy of the code exists on every node. Interwork II uses the global object name space to support a distributed, lightweight process model. This allows processes to be uniformly accessed throughout the cube. Additional objects for inter-process communication are also provided. The global object name space is implemented in a fully distributed manner in order to eliminate performance bottlenecks. Techniques for caching object references to further speed up object access are described.

关键词： Parallel programming

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2nd International Workshop on object-oriented Database systems, 1988

2nd International Workshop on Object-Oriented Database Syste...

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2nd International Workshop on object-oriented Database systems, 1988

ISBN: (纸本)9783540503453

The proceedings contain 38 papers. The special focus in this conference is on object-oriented Database systems. The topics include: The design and implementation of O, an object-oriented database system;abstract object types for databases;rule execution in CPLEX: A persistent objectbase;constraint analysis: A tool for explaining the semantics of complex objects;providing uniform access to heterogeneous information bases;the object shell: An extensible system to define an object-oriented view of an existing database;an adaptive derived data manager for distributed databases;mapping object-oriented concepts into relational concepts by meta-compilation in a logic programming environment;foundations of relational object management systems;the COMANDOS integration system: An object oriented approach to the interconnection of heterogeneous applications;a learning-based approach to meta-data evolution in an object-oriented database;zEITGEIST: Database support for object-oriented programming;views, data abstraction, and inheritance in the FUGUE data model;vodak kernel data model;a model for an object management system for software engineering environments;multiple inheritance and genericity for the integration of a database management system in an object-oriented approach;instance inheritance mechanisms for object oriented databases;identification of database objects by key;the design of dynamo: A general-purpose information processing model with a time dimension;a uniform concept for storing and manipulating engineering objects;managing persistent data with mneme: Designing a reliable, shared object interface;integration of database management with an object-oriented programming language;a distributed object server;on dynamically defined complex objects and SQL;common object-oriented repository system;identity, equality and query optimization;optimization of object-retrieval queries.

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Naming anonymous JavaScript functions

Naming anonymous JavaScript functions

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ACM International conference on systems, programming, languages, and applications: Software for Humanity, SPLASH'11

作者： Mirghasemi, Salman Barton, John J. Petitpierre, Claude Switzerland IBM Research Almaden United States Google Inc Mountain View CA United States

ISBN: (纸本)9781450309424

JavaScript developers create programs by calling functions and they use functions to construct objects. JavaScript development tools need to report to developers about those functions and constructors, for example in debugger call-stacks and in object representations. However, most functions are anonymous: developers need not to specify names for functions. Based on our analysis of ten large, widely used JavaScript projects, less than 7% of JavaScript functions are named by developers. After studying examples from these JavaScript projects, we propose Static Function-object Consumption, a principled, automated approach based on local source code analysis for providing names to nameless JavaScript functions. We applied our approach to 90000 anonymous functions that appeared in the analyzed JavaScript projects. The approach is successful in naming more than 99% (91% are unique within their file) of anonymous functions while the average length of function names is kept less than 37 characters.

关键词： object oriented programming

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GENERAL object-oriented SOFTWARE DEVELOPMENT: BACKGROUND AND EXPERIENCE.

GENERAL OBJECT-ORIENTED SOFTWARE DEVELOPMENT: BACKGROUND AND...

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Proceedings of the Twenty-First Annual Hawaii International conference on System Sciences. Volume II: Software Track.

作者： Seidewitz, Ed NASA Greenbelt MD USA NASA Greenbelt MD USA

ISBN: (纸本)0818608420

A project involving the development of a simulation system in Ada in parallel with a similar Fortran development has been undertaken. As part of the project, the Ada development team evaluated object-oriented and process-oriented design methodologies for Ada. Finding these methodologies limited in various ways, the team created a general object-oriented development methodology that they applied to the project. The author provides some background on the development of the methodology, describes the main principles of the approach, and presents some experiences using the methodology, including a general comparison of the Ada and Fortran simulator designs.

关键词： COMPUTER programming languages

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object equality profiling

Object equality profiling

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18th Annual conference on object-oriented programming, systems, languages and applications (oopsla 2003)

作者： Marinov, D O'Callahan, R MIT Comp Sci Lab Cambridge MA 02139 USA IBM Corp Div Res TJ Watson Res Ctr Yorktown Hts NY 10598 USA

We present object Equality Profiling (OEP), a new technique for helping programmers discover optimization opportunities in programs. OEP discovers opportunities for replacing a set of equivalent object instances with a single representative object. Such a set represents an opportunity for automatically or manually applying optimizations such as hash consing, heap compression, lazy allocation, object caching, invariant hoisting, and more. To evaluate OEP, we implemented a tool to help programmers reduce the memory usage of Java programs. Our tool performs a dynamic analysis that records all the objects created during a particular program run. The tool partitions the objects into equivalence classes, and uses collected timing information to determine when elements of an equivalence class could have been safely collapsed into a single representative object without affecting the behavior of that program run. We report the results of applying this tool to benchmarks, including two widely used Web application servers. Many benchmarks exhibit significant amounts of object equivalence, and in most benchmarks our profiler identifies optimization opportunities clustered around a small number of allocation sites. We present a case study of using our profiler to find simple manual optimizations that reduce the average space used by live objects in two SpecJVM benchmarks by 47% and 38% respectively.

关键词： object equality object mergeability profiling profile-guided optimization space savings Java language

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Islands. Aliasing protection in object-oriented languages

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SIGPLAN Notices (ACM Special Interest Group on programming languages) 1991年第11期26卷 271-271页

作者： Hogg, John

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