Object and reference immutability using Java generics
| Autor: | Michael D. Ernst, Mahmood Ali, Shay Artzi, Alex Potanin, Adam Kie|un, Yoav Zibin |
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| Rok vydání: | 2007 |
| Předmět: |
Immutability
Class (computer programming) Java Syntax (programming languages) Computer science Programming language Generics in Java Software_PROGRAMMINGTECHNIQUES computer.software_genre Object (computer science) Immutable object TheoryofComputation_LOGICSANDMEANINGSOFPROGRAMS Compiler Software_PROGRAMMINGLANGUAGES computer computer.programming_language |
| Zdroj: | ESEC/SIGSOFT FSE |
| DOI: | 10.1145/1287624.1287637 |
| Popis: | A compiler-checked immutability guarantee provides useful documentation, facilitates reasoning, and enables optimizations. This paper presents Immutability Generic Java (IGJ), a novel language extension that expresses immutability without changing Java's syntax by building upon Java's generics and annotation mechanisms. In IGJ, each class has one additional type parameter that is Immutable, Mutable, or ReadOnly. IGJ guarantees both reference immutability (only mutable references can mutate an object) and object immutability (an immutable reference points to an immutable object). IGJ is the first proposal for enforcing object immutability within Java's syntax and type system, and its reference immutability is more expressive than previous work. IGJ also permits covariant changes of type parameters in a type-safe manner, e.g., a readonly list of integers is a subtype of a readonly list of numbers. IGJ extends Java's type system with a few simple rules. We formalize this type system and prove it sound. Our IGJ compiler works by type-erasure and generates byte-code that can be executed on any JVM without runtime penalty. |
| Databáze: | OpenAIRE |
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