Class UnionContextSelector

java.lang.Object
com.ibm.wala.ipa.callgraph.impl.UnionContextSelector
All Implemented Interfaces:
ContextSelector

public class UnionContextSelector extends Object implements ContextSelector
Checks ContextSelectors A and B, then returns the union of their findings.

The returned Context contains the ContextKeys from A and B. If for a given key a value is generated by A as well as B the value generated by A has the precedence.

As the UnionContextSelector optionally returns a DelegatingContext it cannot be used to anihilate ContextValues of B to null.

Author:
Tobias Blaschke <code@tobiasblaschke.de>
See Also:
  • Constructor Details

  • Method Details

    • getCalleeTarget

      public Context getCalleeTarget(CGNode caller, CallSiteReference site, IMethod callee, InstanceKey[] receiver)
      If only one Context exists return it, else return a DelegatingContext.
      Specified by:
      getCalleeTarget in interface ContextSelector
      Parameters:
      caller - the node containing the call site
      site - description of the call site
      receiver - the abstract objects (InstanceKeys) of parameters of interest to the selector
      Returns:
      the Context in which the callee should be evaluated, or null if no information is available.
    • getRelevantParameters

      public IntSet getRelevantParameters(CGNode caller, CallSiteReference site)
      Description copied from interface: ContextSelector
      Given a calling node and a call site, return the set of parameters based on which this selector may choose to specialize contexts.
      Specified by:
      getRelevantParameters in interface ContextSelector
      Parameters:
      caller - the calling node
      site - the specific call site
      Returns:
      the set of parameters of interest
    • toString

      public String toString()
      Overrides:
      toString in class Object