NDLI: Inference and Checking of Object Immutability

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Inference and Checking of Object Immutability

Content Provider	ACM Digital Library
Author	Milanova, Ana Dong, Yao
Abstract	Reference immutability guarantees that a reference is not used to modify the referenced object. It is well-understood and there are several scalable inference systems. Object immutability, a stronger immutability guarantee, guarantees that an object is not modified. Unfortunately, object immutability is not as well-understood; specifically, we are unaware of an inference system that infers object immutability across large Java programs and libraries. It is tempting to use reference immutability to reason about object immutability. However, representation exposure and object initialization pose significant challenges. In this paper we present a novel type system and a corresponding inference analysis. We leverage reference immutability to infer object immutability overcoming the challenges due to representation exposure and object initialization. We have implemented our object immutability system for Java. Evaluation on the standard Dacapo benchmarks demonstrates precision and scalability. Nearly 40% of all static objects are inferred immutable. Analysis completes in under 2 minutes on all benchmarks.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISBN	9781450341356
DOI	10.1145/2972206.2972208
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2016-08-29
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Immutability Reference immutability Object immutability
Content Type	Text
Resource Type	Article

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