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Formalisation and . . . Bytecode Verification of @NonNull Types

By Chris Male, David J. Pearce, Alex Potanin and Constantine Dymnikov


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

Year: 2013
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