Smalltalk-80: the language and its implementation
Smalltalk-80: the language and its implementation
A semantics of multiple inheritance.
Proc. of the international symposium on Semantics of data types
POPL '90 Proceedings of the 17th ACM SIGPLAN-SIGACT symposium on Principles of programming languages
OOPSLA/ECOOP '90 Proceedings of the European conference on object-oriented programming on Object-oriented programming systems, languages, and applications
Static analysis of linear congruence equalities among variables of a program
TAPSOFT '91 Proceedings of the international joint conference on theory and practice of software development on Colloquium on trees in algebra and programming (CAAP '91): vol 1
Methods and logics for proving programs
Handbook of theoretical computer science (vol. B)
Object-oriented type systems
A denotational semantics of inheritance and its correctness
Information and Computation
A behavioral notion of subtyping
ACM Transactions on Programming Languages and Systems (TOPLAS)
Covariance and contravariance: conflict without a cause
ACM Transactions on Programming Languages and Systems (TOPLAS)
Object-oriented software construction (2nd ed.)
Object-oriented software construction (2nd ed.)
Types as abstract interpretations
Proceedings of the 24th ACM SIGPLAN-SIGACT symposium on Principles of programming languages
SIMULA: an ALGOL-based simulation language
Communications of the ACM
Systematic design of program transformation frameworks by abstract interpretation
POPL '02 Proceedings of the 29th ACM SIGPLAN-SIGACT symposium on Principles of programming languages
POPL '77 Proceedings of the 4th ACM SIGACT-SIGPLAN symposium on Principles of programming languages
Parametric shape analysis via 3-valued logic
ACM Transactions on Programming Languages and Systems (TOPLAS)
Systematic design of program analysis frameworks
POPL '79 Proceedings of the 6th ACM SIGACT-SIGPLAN symposium on Principles of programming languages
Introduction to Algorithms
Distinctness and Sharing Domains for Static Analysis of Java Programs
ECOOP '01 Proceedings of the 15th European Conference on Object-Oriented Programming
Semantics-Based Composition of Class Hierarchies
ECOOP '02 Proceedings of the 16th European Conference on Object-Oriented Programming
WCRE '01 Proceedings of the Eighth Working Conference on Reverse Engineering (WCRE'01)
Refactoring class hierarchies with KABA
OOPSLA '04 Proceedings of the 19th annual ACM SIGPLAN conference on Object-oriented programming, systems, languages, and applications
Class invariants as abstract interpretation of trace semantics
Computer Languages, Systems and Structures
Class-level modular analysis for object oriented languages
SAS'03 Proceedings of the 10th international conference on Static analysis
Abstract interpretation-based verification of non-functional requirements
COORDINATION'05 Proceedings of the 7th international conference on Coordination Models and Languages
Changing programs correctly: refactoring with specifications
FM'06 Proceedings of the 14th international conference on Formal Methods
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A semantics-based framework is presented for the definition and manipulation of class hierarchies for object-oriented languages. The framework is based on the notion of observable of a class, i.e., an abstraction of its semantics when focusing on a behavioral property of interest. We define a semantic subclass relation, capturing the fact that a subclass preserves the behavior of its superclass up to a given (tunable) observed property. We study the relation between syntactic subclass, as present in mainstream object-oriented languages, and the notion of semantic subclass. The approach is then extended to class hierarchies, leading to a semantics-based modular treatment of a suite of basic observable-preserving operators on hierarchies. We instantiate the framework by presenting effective algorithms that compute a semantic superclass for two given classes, that extend a hierarchy with a new class, and that merge two hierarchies by preserving semantic subclass relations.