Package com.ibm.wala.ipa.callgraph.propagation.cfa

Class nObjContextSelector

java.lang.Object

com.ibm.wala.ipa.callgraph.propagation.cfa.nObjContextSelector

All Implemented Interfaces:

ContextSelector

public class nObjContextSelector
extends Object
implements ContextSelector

k-limited object sensitive context selector

• for static method : For a few well-known static factory methods from the standard libraries, use CallerSiteContext.Otherwise, directly copy the context of the last non-static method
• for virtual method : The Context consists of n allocation sites
• for an object(fixed at allocation) : The heap context consists of n allocation sites inherited from CGNode

Field Summary

Fields

Modifier and Type	Field	Description
static final ContextKey	ALLOCATION_STRING_KEY

Constructor Summary

Constructors

Constructor	Description
nObjContextSelector(int n, ContextSelector base)

Method Summary

Modifier and Type	Method	Description
Context	getCalleeTarget(CGNode caller, CallSiteReference site, IMethod callee, InstanceKey[] actualParameters)	Given a calling node and a call site, returns the Context in which the callee should be evaluated.
protected Context	getCalleeTargetForStaticCall(CGNode caller, CallSiteReference site, IMethod callee)
IntSet	getRelevantParameters(CGNode caller, CallSiteReference site)	Given a calling node and a call site, return the set of parameters based on which this selector may choose to specialize contexts.

Methods inherited from class java.lang.Object

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

Field Details

ALLOCATION_STRING_KEY

public static final ContextKey ALLOCATION_STRING_KEY

Constructor Details

nObjContextSelector

public nObjContextSelector(int n,
 ContextSelector base)

Method Details

getCalleeTarget

public Context getCalleeTarget(CGNode caller,
 CallSiteReference site,
 IMethod callee,
 InstanceKey[] actualParameters)

Description copied from interface: ContextSelector

Given a calling node and a call site, returns the Context in which the callee should be evaluated.

Specified by:

getCalleeTarget in interface ContextSelector

Parameters:

caller - the node containing the call site

site - description of the call site

actualParameters - 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.

getCalleeTargetForStaticCall

protected Context getCalleeTargetForStaticCall(CGNode caller,
 CallSiteReference site,
 IMethod callee)

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