By Benjamin Weiß
Software program structures play a relevant position in glossy society, and their correctness is usually crucially very important. Formal specification and verification are promising techniques for making sure correctness extra carefully than simply through checking out. This paintings provides an strategy for deductively verifying design-by-contract necessities of object-oriented courses. The process is predicated on dynamic good judgment, and addresses the demanding situations of modularity and automation utilizing dynamic frames and predicate abstraction.
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Extra info for Deductive Verification of Object-Oriented Software: Dynamic Frames, Dynamic Logic and Predicate Abstraction
The concept of object invariants goes back to Hoare . In JML, object invariants are declared with the keyword invariant. size to always be between 0 and the array’s length; we want the array components between these bounds to be 21 2. ArrayStoreException, because the type of its argument might not be compatible with the type of the array. Like method parameters and return values, field declarations of a reference type can be annotated with non_null and nullable to specify whether null values are allowed or not.
In formal specification, behavioural subtyping typically means that a method which overrides another method has a precondition that is implied by the overridden method’s precondition, and, conversely, a postcondition that implies the 23 2. Background on JML overridden method’s postcondition. If all subtypes are behavioural subtypes, then this enables modular reasoning about a dynamically bound method call using only the contract found in the static type of the receiver: if the precondition of this contract holds, then this implies that the precondition of any overriding method must also hold; and the postcondition found in the static type is guaranteed to also be established by any overriding method.
UnknownError. As we consider these errors to be out of the program’s control, we do not demand that the program guarantees that they do not occur, or that any conditions hold afterwards if they do occur. Yet another abbreviation supported by JML is the keyword non_null. g. 2. = null”, respectively. Moreover, as proposed by Chalin and Rioux , non_null has become the default in JML: now the non_null modifier is always implicitly present, unless something is explicitly labelled as nullable. = null”.