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acm SIGMOD International conference on Management of Data

作者： Aref, Molham ten Cate, Balder Green, Todd J. Kimelfeld, Benny Olteanu, Dan Pasalic, Emir Veldhuizen, Todd L. Washburn, Geoffrey LogicBlox Inc Atlanta GA 30309 USA

ISBN: (纸本)9781450327589

The LogicBlox system aims to reduce the complexity of software development for modern applications which enhance and automate decision-making and enable their users to evolve their capabilities via a "self-service" model. Our perspective in this area is informed by over twenty years of experience building dozens of missioncritical enterprise applications that are in use by hundreds of large enterprises across industries such as retail, telecommunications, banking, and government. We designed and built LogicBlox to be the system we wished we had when developing those applications. In this paper, we discuss the design considerations behind the LogicBlox system and give an overview of its implementation, highlighting innovative aspects. These include: LogiQL, a unified and declarative language based on Datalog;the use of purely functional data structures;novel join processing strategies;advanced incremental maintenance and live programming facilities;a novel concurrency control scheme;and built-in support for prescriptive and predictive analytics.

关键词： LogicBlox LogiQL Datalog Leapfrog Triejoin Incremental Maintenance Transaction Repair Live programming Predictive Analytics

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Beyond the PDP-11: Architectural support for a memory-safe C abstract machine 15

Beyond the PDP-11: Architectural support for a memory-safe C...

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20th International conference on Architectural Support for programming languages and Operating Systems (ASPLOS)

作者： Chisnall, David Rothwell, Colin Watson, Robert N. M. Woodruff, Jonathan Vadera, Munraj Moore, Simon W. Roe, Michael Davis, Brooks Neumann, Peter G. Univ Cambridge Cambridge CB2 1TN England SRI Int Princeton NJ USA

ISBN: (纸本)9781450328357

We propose a new memory-safe interpretation of the C abstract machine that provides stronger protection to benefit security and debugging. Despite ambiguities in the specification intended to provide implementation flexibility, contemporary implementations of C have converged on a memory model similar to the PDP-11, the original target for C. This model lacks support for memory safety despite well-documented impacts on security and reliability. Attempts to change this model are often hampered by assumptions embedded in a large body of existing C code, dating back to the memory model exposed by the original C compiler for the PDP-11. Our experience with attempting to implement a memory-safe variant of C on the CHERI experimental microprocessor led us to identify a number of problematic idioms. We describe these as well as their interaction with existing memory safety schemes and the assumptions that they make beyond the requirements of the C specification. Finally, we refine the CHERI ISA and abstract model for C, by combining elements of the CHERI capability model and fat pointers, and present a softcore CPU that implements a C abstract machine that can run legacy C code with strong memory protection guarantees.

关键词： capabilities processor design compilers memory protection C language security memory safety bounds checking

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From network interface to multithreaded web applications : A case study in modular program verification 15

From network interface to multithreaded web applications : A...

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42nd Annual acm sigplan-SIGACT Symposium on Principles of programming languages, POPL 2015

作者： Chlipala, Adam MIT CSAIL United States

ISBN: (纸本)9781450333009

Many verifications of realistic software systems are monolithic, in the sense that they define single global invariants over complete system state. More modular proof techniques promise to support reuse of component proofs and even reduce the effort required to verify one concrete system, just as modularity simplifies standard software development. This paper reports on one case study applying modular proof techniques in the Coq proof assistant. To our knowledge, it is the first modular verification certifying a system that combines infrastructure with an application of interest to end users. We assume a nonblocking API for managing TCP networking streams, and on top of that we work our way up to certifying multithreaded, database-backed Web applications. Key verified components include a cooperative threading library and an implementation of a domain-specific language for XML processing. We have deployed our case-study system on mobile robots, where it interfaces with off-the-shelf components for sensing, actuation, and control. Copyright © 2015 by the Association for Computing Machinery, Inc. (acm).

关键词： Software design

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implementation of real-time WiFi receiver in Ziria, language for rapid prototyping of wireless PHY 21

Implementation of real-time WiFi receiver in Ziria, language...

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21st Annual International conference on Mobile Computing and Networking, MobiCom 2015

作者： Stewart, Gordon Gowda, Mahanth Mainland, Geoffrey Radunović, Božidar Vytiniotis, Dimitrios Ohio University United States UIUC United States Drexel United States Microsoft Research United States

ISBN: (纸本)9781450336192

Software-defined radios (SDR) have the potential to bring major innovation in wireless networking design. However, their impact so far has been limited due to complex programming tools. Most of the existing tools are either too slow to achieve the full line speeds of contemporary wireless PHYs or are too complex to master. In this demo we present our novel SDR programming environment called Ziria. Ziria consists of a novel programming language and an optimizing compiler. The compiler is able to synthesize very efficient SDR code from high-level PHY descriptions written in Ziria language. To illustrate its potential, we present the design of an LTE-like PHY layer in Ziria. We run it on the Sora SDR platform and demonstrate on a test-bed that it is able to operate in real-time.

关键词： Software radio

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acm International conference Proceeding Series

ACM International Conference Proceeding Series

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11th Central and Eastern European Software Engineering conference in Russia, CEE-SECR 2015

ISBN: (纸本)9781450341301

The proceedings contain 11 papers. The topics discussed include: securing outsourced database: architecture for protected web resource;implementation of request switch in PleskFS file system;automatic request analyzer for QoS enabled storage system;aspect markup of a source code for quick navigating a project;on development of static analysis tools for string-embedded languages;some aspects of a modern common-purpose programming language design;CPU utilization prediction methods overview;discovering clones in software: from complex algorithms to everyday desktop tool;justification of the choice of neural networks learning algorithms for indoor mobile positioning;BDD by example: Russian Bylina written in gherkin language;and usage of design patterns as a kind of components of software architecture.

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EXPLORER : Query- and Demand-Driven Exploration of Interprocedural Control Flow Properties

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acm sigplan NOTICES 2015年第10期50卷 520-534页

作者： Feng, Yu Wang, Xinyu Dillig, Isil Lin, Calvin Univ Texas Austin Austin TX 78712 USA

This paper describes a general framework-and its implementation in a tool called EXPLORER-for statically answering a class of interprocedural control flow queries about Java programs. EXPLORER allows users to formulate queries about feasible callstack configurations using regular expressions, and it employs a precise, demand-driven algorithm for answering such queries. Specifically, EXPLORER constructs an automaton A that is iteratively refined until either the language accepted by A is empty (meaning that the query has been refuted) or until no further refinement is possible based on a precise, context-sensitive abstraction of the program. We evaluate EXPLORER by applying it to three different program analysis tasks, namely, (1) analysis of the observer design pattern in Java, (2) identification of a class of performance bugs, and (3) analysis of inter-component communication in Android applications. Our evaluation shows that EXPLORER is both efficient and precise.

关键词： Algorithms languages Program analysis Demand-driven analysis points-to analysis query language control flow properties

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Cross-Layer Memory Management for Managed language Applications

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acm sigplan NOTICES 2015年第10期50卷 488-504页

作者： Jantz, Michael R. Robinson, Forrest J. Kulkarni, Prasad A. Doshi, Kshitij A. Univ Tennessee Knoxville TN 37996 USA Univ Kansas Lawrence KS 66045 USA Intel Corp Santa Clara CA 95051 USA

Performance and energy efficiency in memory have become critically important for a wide range of computing domains. However, it is difficult to control and optimize memory power and performance because these effects depend upon activity across multiple layers of the vertical execution stack. To address this challenge, we construct a novel and collaborative framework that employs object placement, cross-layer communication, and page-level management to effectively distribute application objects in the DRAM hardware to achieve desired power/performance goals. In this work, we describe the design and implementation of our framework, which is the first to integrate automatic object profiling and analysis at the application layer with fine-grained management of memory hardware resources in the operating system. We demonstrate the utility of our framework by employing it to more effectively control memory power consumption. We design a custom memory-intensive workload to show the potential of our approach. Next, we develop sampling and profiling-based analyses and modify the code generator in the HotSpot VM to understand object usage patterns and automatically determine and control the placement of hot and cold objects in a partitioned VM heap. This information is communicated to the operating system, which uses it to map the logical application pages to the appropriate DRAM ranks according to user-defined provisioning goals. We evaluate our framework and find that it achieves our test goal of significant DRAM energy savings across a variety of workloads, without any source code modifications or recompilations.

关键词： design Experimentation Performance Cross-layer Power Efficiency DRAM HotSpot

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PLDI'12 - proceedings of the 2012 acm sigplan conference on programming language design and implementation

PLDI'12 - Proceedings of the 2012 ACM SIGPLAN Conference on ...

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33rd acm sigplan conference on programming language design and implementation, PLDI'12

ISBN: (纸本)9781450312059

The proceedings contain 48 papers. The topics discussed include: adaptive input-aware compilation for graphics engines;and then there were none: a stall-free real-time garbage collector for reconfigurable hardware;the implicit calculus: a new foundation for generic programming;deterministic parallelism via liquid effects;speculative linearizability;understanding and detecting real-world performance bugs;input-sensitive profiling;language-based control and mitigation of timing channels;Diderot: a parallel DSL for image analysis and visualization;synthesising graphics card programs from DSLs;Parcae: a system for flexible parallel execution;JANUS: exploiting parallelism via hindsight;reagents: expressing and composing fine-grained concurrency;and proving acceptability properties of relaxed nondeterministic approximate programs.

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Getting F-Bounded Polymorphism into Shape 14

Getting F-Bounded Polymorphism into Shape

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35th acm sigplan conference on programming language design and implementation (PLDI)

作者： Greenman, Ben Muehlboeck, Fabian Tate, Ross Cornell Univ Ithaca NY 14853 USA

ISBN: (纸本)9781450327848

We present a way to restrict recursive inheritance without sacrificing the benefits of F-bounded polymorphism. In particular, we distinguish two new concepts, materials and shapes, and demonstrate through a survey of 13.5 million lines of open-source generic-Java code that these two concepts never actually overlap in practice. With this Material-Shape Separation, we prove that even naive type-checking algorithms are sound and complete, some of which address problems that were unsolvable even under the existing proposals for restricting inheritance. We illustrate how the simplicity of our design reflects the design intuitions employed by programmers and potentially enables new features coming into demand for upcoming programming languages.

关键词： Algorithms design languages Materials Shapes Separation Subtyping F-Bounded Polymorphism Variance Decidability Joins Higher-Kinded Types

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Code Completion with Statistical language Models 14

Code Completion with Statistical Language Models

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35th acm sigplan conference on programming language design and implementation (PLDI)

作者： Raychev, Veselin Vechev, Martin Yahav, Eran Swiss Fed Inst Technol Zurich Switzerland Technion Haifa Israel

ISBN: (纸本)9781450327848

We address the problem of synthesizing code completions for programs using APIs. Given a program with holes, we synthesize completions for holes with the most likely sequences of method calls. Our main idea is to reduce the problem of code completion to a natural-language processing problem of predicting probabilities of sentences. We design a simple and scalable static analysis that extracts sequences of method calls from a large codebase, and index these into a statistical language model. We then employ the language model to find the highest ranked sentences, and use them to synthesize a code completion. Our approach is able to synthesize sequences of calls across multiple objects together with their arguments. Experiments show that our approach is fast and effective. Virtually all computed completions typecheck, and the desired completion appears in the top 3 results in 90% of the cases.

关键词： Static analysis

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