A Machine-Checked, Type-Safe Model of Java Concurrency : Language, Virtual Machine, Memory Model, and Verified Compiler

The Java programming language provides safety and security guarantees such as type safety and its security architecture. They distinguish it from other mainstream programming languages like C and C++. In this work, we develop a machine-checked model of concurrent Java and the Java memory model and investigate the impact of concurrency on these guarantees. From the formal model, we automatically obtain an executable verified compiler to bytecode and a validated virtual machine

Deductive Verification of Concurrent Programs and its Application to Secure Information Flow for Java

Formal verification of concurrent programs still poses a major challenge in computer science. Our approach is an adaptation of the modular rely/guarantee methodology in dynamic logic. Besides functional properties, we investigate language-based security. Our verification approach extends naturally to multi-threaded Java and we present an implementation in the KeY verification system. We propose natural extensions to JML regarding both confidentiality properties and multi-threaded programs

Ogre and Pythia: An Invariance Proof Method for Weak Consistency Models

We design an invariance proof method for concurrent programs parameterised by a weak consistency model. The calculational design of the invariance proof method is by abstract interpretation of a truly parallel analytic semantics. This generalises the methods by Lamport and Owicki-Gries for sequential consistency. We use cat as an example of language to write consistency specifications of both concurrent programs and machine architectures

C의 저수준 기능과 컴파일러 최적화 조화시키기

학위논문 (박사)-- 서울대학교 대학원 : 공과대학 컴퓨터공학부, 2019. 2. 허충길.주류 C 컴파일러들은 프로그램의 성능을 높이기 위해 공격적인 최적화를 수행하는데, 그런 최적화는 저수준 기능을 사용하는 프로그램의 행동을 바꾸기도 한다. 불행히도 C 언어를 디자인할 때 저수준 기능과 컴파일러 최적화를 적절하게 조화시키가 굉장히 어렵다는 것이 학계와 업계의 중론이다. 저수준 기능을 위해서는, 그러한 기능이 시스템 프로그래밍에 사용되는 패턴을 잘 지원해야 한다. 컴파일러 최적화를 위해서는, 주류 컴파일러가 수행하는 복잡하고도 효과적인 최적화를 잘 지원해야 한다. 그러나 저수준 기능과 컴파일러 최적화를 동시에 잘 지원하는 실행의미는 오늘날까지 제안된 바가 없다. 본 박사학위 논문은 시스템 프로그래밍에서 요긴하게 사용되는 저수준 기능과 주요한 컴파일러 최적화를 조화시킨다. 구체적으로, 우린 다음 성질을 만족하는 느슨한 동시성, 분할 컴파일, 정수-포인터 변환의 실행의미를 처음으로 제안한다. 첫째, 기능이 시스템 프로그래밍에서 사용되는 패턴과, 그러한 패턴을 논증할 수 있는 기법을 지원한다. 둘째, 주요한 컴파일러 최적화들을 지원한다. 우리가 제안한 실행의미에 자신감을 얻기 위해 우리는 논문의 주요 결과를 대부분 Coq 증명기 위에서 증명하고, 그 증명을 기계적이고 엄밀하게 확인했다.To improve the performance of C programs, mainstream compilers perform aggressive optimizations that may change the behaviors of programs that use low-level features in unidiomatic ways. Unfortunately, despite many years of research and industrial efforts, it has proven very difficult to adequately balance the conflicting criteria for low-level features and compiler optimizations in the design of the C programming language. On the one hand, C should support the common usage patterns of the low-level features in systems programming. On the other hand, C should also support the sophisticated and yet effective optimizations performed by mainstream compilers. None of the existing proposals for C semantics, however, sufficiently support low-level features and compiler optimizations at the same time. In this dissertation, we resolve the conflict between some of the low-level features crucially used in systems programming and major compiler optimizations. Specifically, we develop the first formal semantics of relaxed-memory concurrency, separate compilation, and cast between integers and pointers that (1) supports their common usage patterns and reasoning principles for programmers, and (2) provably validates major compiler optimizations at the same time. To establish confidence in our formal semantics, we have formalized most of our key results in the Coq theorem prover, which automatically and rigorously checks the validity of the results.Abstract Acknowledgements Chapter I Prologue Chapter II Relaxed-Memory Concurrency Chapter III Separate Compilation and Linking Chapter IV Cast between Integers and Pointers Chapter V Epilogue 초록Docto

Deductive Verification of Safety-Critical Java Programs

This work investigates the application of deductive verification techniques to safety critical Java programs, in particular RTSJ programs. A focus is put on the formalization of the RTSJ memory model in dynamic logic, the utilization of a region-based memory model for ensuring non-interference and a design-by-contract based approach for the formal specification and verification of worst case memory consumption

Anales del XIII Congreso Argentino de Ciencias de la Computación (CACIC)

Contenido: Arquitecturas de computadoras Sistemas embebidos Arquitecturas orientadas a servicios (SOA) Redes de comunicaciones Redes heterogéneas Redes de Avanzada Redes inalámbricas Redes móviles Redes activas Administración y monitoreo de redes y servicios Calidad de Servicio (QoS, SLAs) Seguridad informática y autenticación, privacidad Infraestructura para firma digital y certificados digitales Análisis y detección de vulnerabilidades Sistemas operativos Sistemas P2P Middleware Infraestructura para grid Servicios de integración (Web Services o .Net)Red de Universidades con Carreras en Informática (RedUNCI

Anales del XIII Congreso Argentino de Ciencias de la Computación (CACIC)

Contenido: Arquitecturas de computadoras Sistemas embebidos Arquitecturas orientadas a servicios (SOA) Redes de comunicaciones Redes heterogéneas Redes de Avanzada Redes inalámbricas Redes móviles Redes activas Administración y monitoreo de redes y servicios Calidad de Servicio (QoS, SLAs) Seguridad informática y autenticación, privacidad Infraestructura para firma digital y certificados digitales Análisis y detección de vulnerabilidades Sistemas operativos Sistemas P2P Middleware Infraestructura para grid Servicios de integración (Web Services o .Net)Red de Universidades con Carreras en Informática (RedUNCI

A JMM-faithful non-interference calculus for Java

Abstract. We present a calculus for establishing non-interference of several Java threads running in parallel. The proof system is built atop an implemented sequential Java Dynamic Logic calculus with 100 % Java Card coverage. We present two semantic and one syntactic type of noninterference conditions to make reasoning efficient. In contrast to previous works in this direction, our method takes into full account the weak guarantees of the Java Memory Model concerning visibility and ordering of memory updates between threads.

Law and Development in East and South-East Asia

During the 1980s and 1990s Asian 'developmental states' attracted much attention in political science and economics literature, but the role of law in the economic development was neglected. It was only after the Asian crisis of 1997 that many analysts began to focus on a lack of regulation and transparency as a major factor triggering the crisis. The crucial questions now are how successful the current reforms will be, and which features of the Asian approach to commercial law will be resistant to reform pressures. This book examines the prospects for commercial law reform in Asia, giving particular attention to Japan and Singapore, as frequently cited role models for Asian developmentalism, and also examining development related business laws in countries such as China, Korea, Indonesia, Malaysia, Vietnam and the Philippines