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11th acm sigplan International Workshop on the State Of the Art in Program Analysis, SOAP 2022, co-located with the 43rd acm sigplan International conference on programming language design and implementation, PLDI 2022

作者： Slagel, J. Tanner Muñoz, César Balachandran, Swee Moscato, Mariano Dutle, Aaron Masci, Paolo White, Lauren Nasa Langley Research Center United States National Institute of Aerospace United States

ISBN: (纸本)9781450392747

this paper describes an ongoing effort to embed and verify differential dynamic logic (dL) in the Prototype Verification System (PVS). dL is a logic for specifying and formally reasoning about hybrid systems, i.e., systems that employ both continuous and discrete dynamics. there are several benefits of this effort. First, the embedding of dL in PVS offers an independent formal verification of the semantics and inference rules of dL. Second, the embedding is fully operational within PVS, giving PVS practitioners the ability to use dL in the formal specification and verification of hybrid systems. third, the rich specification language, type system, and powerful interactive prover of PVS can be used on dL objects. In addition to the embedding and verification of dL, a custom extension for Visual Studio Code has been developed, so that a stylized dL syntax can be used to specify hybrid programs and their properties. © 2022 acm.

关键词： Hybrid systems

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Morello MicroPython: A Python Interpreter for CHERI 20

Morello MicroPython: A Python Interpreter for CHERI

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20th acm sigplan International conference on Managed programming languages and Runtimes (MPLR)

作者： Lowther, Duncan Jacob, Dejice Singer, Jeremy Univ Glasgow Glasgow Scotland

ISBN: (纸本)9798400703805

Arm Morello is a prototype system that supports CHERI hardware capabilities for improving runtime security. As Morello becomes more widely available, there is a growing effort to port open source code projects to this novel platform. Although high-level applications generally need minimal code refactoring for CHERI compatibility, low-level systems code bases require significant modification to comply with the stringent memory safety constraints that are dynamically enforced by Morello. In this paper, we describe our work on porting the MicroPython interpreter to Morello with the CheriBSD OS. Our key contribution is to present a set of generic lessons for adapting managed runtime execution environments to CHERI, including (1) a characterization of necessary source code changes, (2) an evaluation of runtime performance of the interpreter on Morello, and (3) a demonstration of pragmatic memory safety bug detection. Although MicroPython is a lightweight interpreter, mostly written in C, we believe that the changes we have implemented and the lessons we have learned are more widely applicable. To the best of our knowledge, this is the first published description of meaningful experience for scripting language runtime engineering with CHERI and Morello.

关键词： CHERI capabilities software implementation

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Generative software product line development using variability-aware design patterns

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COMPUTER languageS SYSTEMS & STRUCTURES 2017年 48卷 89-111页

作者： Seidl, Christoph Schuster, Sven Schaefer, Ina Tech Univ Carolo Wilhelmina Braunschweig Braunschweig Germany

Software Product Lines (SPLs) are an approach to reuse in-the-large that models a set of closely related software systems in terms of commonalities and variabilities. design patterns are best practices for addressing recurring design problems in object-oriented source code. In the practice of implementing SPL, instances of certain design patterns are employed to handle variability, which makes these "variability-aware design patterns" a best practice for SPL design. However, currently there is no dedicated method for proactively developing SPLs using design patterns suitable for realizing variable functionality. In this paper, we present a method to perform generative SPL development with design patterns. We use role models to capture design patterns and their relation to a variability model. We further allow mapping of individual design pattern roles to (parts of) implementation elements to be generated (e.g., classes, methods) and check the conformance of the realization with the specification of the pattern. We provide definitions for the variability-aware versions of the design patterns Observer, Strategy, Template Method and Composite. Furthermore, we support generation of realization's in Java, C++ and UML class diagrams utilizing annotative, compositional and transformational variability realization mechanisms. Hence, we support proactive development of SPLs using design patterns to apply best practices for the realization of variability. We realize our concepts within the Eclipse IDE and demonstrate them within a case study. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： SOFTWARE product line engineering COMPUTER software development SOFTWARE patterns REALIZATION (Linguistics) JAVA (Computer program language) C++ (Computer program language)

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Hera-JVM: A Runtime System for Heterogeneous Multi-Core Architectures 10

Hera-JVM: A Runtime System for Heterogeneous Multi-Core Arch...

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conference on Object Oriented programming Systems, languages and Applications/SPLASH 2010

作者： McIlroy, Ross Sventek, Joe Microsoft Res Cambridge Cambridge England Univ Glasgow Glasgow G12 8QQ Lanark Scotland

ISBN: (纸本)9781450302036

Heterogeneous multi-core processors, such as the IBM Cell processor, can deliver high performance. However, these processors are notoriously difficult to program: different cores support different instruction set architectures, and the processor as a whole does not provide coherence between the different cores' local memories. We present Hera-JVM, an implementation of the Java Virtual Machine which operates over the Cell processor, thereby making this platforms more readily accessible to mainstream developers. Hera-JVM supports the full Java language;threads from an unmodified Java application can be simultaneously executed on both the main PowerPC-based core and on the additional SPE accelerator cores. Migration of threads between these cores is transparent from the point of view of the application, requiring no modification to Java source code or bytecode. Hera-JVM supports the existing Java Memory Model, even though the underlying hardware does not provide cache coherence between the different core types. We examine Hera-JVM's performance under a series of real-world Java benchmarks from the SpecJVM, Java Grande and Dacapo benchmark suites. these benchmarks show a wide variation in relative performance on the different core types of the Cell processor, depending upon the nature of their workload. Execution of these benchmarks on Hera-JVM can achieve speedups of up to 2.25x by using one of the Cell processor's SPE accelerator cores, compared to execution on the main PowerPC-based core. When all six SPE cores are exploited, parallel workloads can achieve speedups of up to 13x compared to execution on the single PowerPC core.

关键词： design languages Performances

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Parameterized types for Java

Parameterized types for Java

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the 1997 24th acm sigplan-SIGACT Symposium on Principles of programming languages, POPL'97

作者： Myers, Andrew C. Bank, Joseph A. Liskov, Barbara Massachusetts Inst of Technology Cambridge MA United States

Java offers the real possibility that most programs can be written in a type-safe language. However, for Java to be broadly useful, it needs additional expressive power. this paper extends Java in one area where more power is needed: support for parametric polymorphism, which allows the definition and implementation of generic abstractions. We discuss both the rationale for our design decisions and the impact of the extension on other parts of Java, including arrays and the class library. We also describe optional extensions to the Java virtual machine to allow parameterized bytecodes, and how to verify them efficiently. We have extended the Jave bytecode interpreter to provide good performance for parameterized code in both execution speed and code size, without slowing down non-parameterized code.

关键词： Object oriented programming

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Charm++: A portable concurrent object oriented system based on C++ 8

Charm++: A portable concurrent object oriented system based ...

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

作者： Kale, Laxmikant V. Krishnan, Sanjeev Department of Computer Science University of Illinois Urbana-Champaign United States

ISBN: (纸本)0897915879

We describe Charm++, an object oriented portable parallel programming language based on C++. Its design philosophy, implementation, sample applications and their performance on various parallel machines are described. Charm++ is an explicitly parallel language consisting of C++ with a few extensions. It provides a clear separation between sequential and parallel objects. the execution model of Charm++ is message driven, thus helping one write programs that are latencytolerant. the language supports multiple inheritance, dynamic binding, overloading, strong typing, and reuse for parallel objects. Charm++ provides specific modes for sharing information between parallel objects. Extensive dynamic load balancing strategies are provided. It is based on the Charm parallel programming system, and its runtime system implementation reuses most of the runtime system for Charm. © 1993 acm.

关键词： Parallel programming

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iTasks: Executable specifications of interactive work flow systems for the web

iTasks: Executable specifications of interactive work flow s...

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12th acm sigplan International conference on Functional programming

作者： Plasmeijer, Rinus Achten, Peter Koopman, Pieter Radboud Univ Nijmegen Inst Comp & Informat Sci Software Technol Dept NL-6525 ED Nijmegen Netherlands

ISBN: (纸本)9781595938152

In this paper we introduce the iTask system: a set of combinators to specify work flows in a pure functional language at a very high level of abstraction. Work flow systems are automated systems in which tasks are coordinated that have to be executed by humans and computers. the combinators that we propose support work flow patterns commonly found in commercial work flow systems. Compared with most of these commercial systems, the iTask system offers several advantages: tasks are statically typed, tasks can be higher order, the combinators are fully compositional, dynamic and recursive work flows can be specified, and last but not least, the specification is used to generate an executable web-based multi-user work flow application. With the iTask system, useful work flows can be defined which cannot be expressed in other systems: work can be interrupted and subsequently directed to other workers for further processing. the implementation is special as well. It is based on the Clean iData toolkit which makes it possible to create fully dynamic, interactive, thin client web applications. thanks to the generic programming techniques used in the iData toolkit, the programming effort is reduced significantly: state handling, form rendering, user interaction, and storage management is handled automatically. the iTask system allows a task to be regarded as a special kind of persistent redex being reduced by the application user via task completion. the combinators control the order in which these redexes are made available to the application user. the system rewrites the persistent task redexes in a similar way as functions are rewritten in lazy functional languages.

关键词： design languages clean iData iTask

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SLE 2016 - Proceedings of the 2016 acm sigplan International conference on Software language Engineering, co-located with SPLASH 2016

SLE 2016 - Proceedings of the 2016 ACM SIGPLAN International...

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9th acm sigplan International conference on Software language Engineering, SLE 2016

ISBN: (纸本)9781450344470

the proceedings contain 23 papers. the topics discussed include: parsing and reflective printing, bidirectionally;taming context-sensitive languages with principled stateful parsing;efficient development of consistent projectional editors using grammar cells;experiences of Models@run-time with EMF and CDO;runtime support for rule-based access-control evaluation through model-transformation;object-oriented design pattern for DSL program monitoring;execution framework of the GEMOC studio;language design and implementation for the domain of coding conventions;BSML-mbeddr: integrating semantically configurable state-machine models in a C programming environment;adding uncertainty and units to quantity types in software models;FRaMED: full-fledge role modeling editor;towards a universal code formatter through machine learning;the IDE portability problem and its solution in Monto;principled syntactic code completion using placeholders;automated testing support for reactive domain-specific modelling languages;symbolic execution of high-level transformations;and raincode assembler compiler.

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language support for lightweight transactions

Language support for lightweight transactions

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18th Annual conference on Object-Oriented programming, Systems, languages and Applications (OOPSLA 2003)

作者： Harris, T Fraser, K Univ Cambridge Comp Lab Cambridge CB3 0FD England

Concurrent programming is notoriously difficult. Current abstractions are intricate and make it hard to design computer systems that are reliable and scalable. We argue that these problems can be addressed by moving to a declarative style of concurrency control in which programmers directly indicate the safety properties that they require. In our scheme the programmer demarks sections of code which execute within lightweight software-based transactions that commit atomically and exactly once. these transactions can update shared data, instantiate objects, invoke library features and so on. they can also block, waiting for arbitrary boolean conditions to become true. Transactions which do not access the same shared memory locations can commit concurrently. Furthermore, in general, no performance penalty is incurred for memory accesses outside transactions. We present a detailed design of this proposal along with an implementation and evaluation. We argue that the resulting system (i) is easier for mainstream programmers to use, (ii) prevents lock-based priority-inversion and deadlock problems and (iii) can offer performance advantages.

关键词： concurrency conditional critical regions transactions non-blocking systems

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Pluggable AOP - designing aspect mechanisms for third-party composition

Pluggable AOP - Designing aspect mechanisms for third-party ...

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OOPSLA'05 - 20th Annual acm conference on Object-Oriented programming, Systems, languages, and Applications

作者： Kojarski, Sergei Lorenz, David H. Department of Computer Science University of Virginia Charlottesville VA 22904-4740 United States Northeastern University University of Virginia

Studies of Aspect-Oriented programming (AOP) usually focus on a language in which a specific aspect extension is integrated with a base language. languages specified in this manner have a fixed, non-extensible AOP functionality. this paper argues the need for AOP to support the integration and use of multiple domain-specific aspect extensions together. We study the more general case of integrating a base language with a set of third-party aspect extensions for that language. We present a general mixin-based semantic framework for implementing dynamic aspect extensions in such a way that multiple, independently developed aspect mechanisms can be subject to third-party composition and work collaboratively. Principles governing the design of a collaborative aspect mechanism are aspectual effect exposure and implementation hiding. Copyright 2005 acm.

关键词： Object oriented programming

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