Formalisation and implementation of an algorithm for bytecode verification of @NonNull types

  • Authors:
  • Chris Male;David J. Pearce;Alex Potanin;Constantine Dymnikov

  • Affiliations:
  • -;-;-;-

  • Venue:
  • Science of Computer Programming
  • Year:
  • 2011

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Abstract

Java's annotation mechanism allows us to extend its type system with non-null types. Checking such types cannot be done using the existing bytecode verification algorithm. We extend this algorithm to verify non-null types using a novel technique that identifies aliasing relationships between local variables and stack locations in the JVM. We formalise this for a subset of Java Bytecode and report on experiences using our implementation.