Package org.checkerframework.dataflow.analysis

Class UnusedAbstractValue

java.lang.Object

org.checkerframework.dataflow.analysis.UnusedAbstractValue

All Implemented Interfaces:

AbstractValue<UnusedAbstractValue>

public final class UnusedAbstractValue
extends Object
implements AbstractValue<UnusedAbstractValue>

UnusedAbstractValue is an AbstractValue that is not involved in any lub computation during dataflow analysis. For those analyses which handle lub computation at a higher level (e.g., store level), it is sufficient to use UnusedAbstractValue and unnecessary to implement another specific AbstractValue. Example analysis using UnusedAbstractValue is LiveVariable analysis. This is a workaround for issue https://github.com/eisop/checker-framework/issues/200

Method Summary

Modifier and Type	Method	Description
UnusedAbstractValue	leastUpperBound(UnusedAbstractValue other)	Compute the least upper bound of two values.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

leastUpperBound

public UnusedAbstractValue leastUpperBound(UnusedAbstractValue other)

Description copied from interface: AbstractValue

Compute the least upper bound of two values.

Important: This method must fulfill the following contract:

• Does not change this.
• Does not change other.
• Returns a fresh object which is not aliased yet.
• Returns an object of the same (dynamic) type as this, even if the signature is more permissive.
• Is commutative.

Specified by:

leastUpperBound in interface AbstractValue<UnusedAbstractValue>