edu.umd.cs.findbugs.ba

Class PruneInfeasibleExceptionEdges

java.lang.Object

edu.umd.cs.findbugs.ba.PruneInfeasibleExceptionEdges

All Implemented Interfaces:

EdgeTypes

public class PruneInfeasibleExceptionEdges
extends Object
implements EdgeTypes

Prune a CFG to remove infeasible exception edges. In order to determine what kinds of exceptions can be thrown by explicit ATHROW instructions, type analysis must first be performed on the unpruned CFG.

Author:

David Hovemeyer

See Also:

CFG, TypeAnalysis

Field Summary

Fields inherited from interface edu.umd.cs.findbugs.ba.EdgeTypes

BACKEDGE_SOURCE_EDGE, BACKEDGE_TARGET_EDGE, CHECKED_EXCEPTIONS_FLAG, EXIT_EDGE, EXPLICIT_EXCEPTIONS_FLAG, FALL_THROUGH_EDGE, GOTO_EDGE, HANDLED_EXCEPTION_EDGE, IFCMP_EDGE, JSR_EDGE, RET_EDGE, RETURN_EDGE, START_EDGE, SWITCH_DEFAULT_EDGE, SWITCH_EDGE, UNHANDLED_EXCEPTION_EDGE, UNKNOWN_EDGE

Constructor Summary

Constructors

Constructor and Description
PruneInfeasibleExceptionEdges(CFG cfg, org.apache.bcel.generic.MethodGen methodGen, TypeDataflow typeDataflow) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	execute() Prune infeasible exception edges from the CFG.
boolean	wasCFGModified()

Methods inherited from class java.lang.Object

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

Constructor Detail

PruneInfeasibleExceptionEdges

public PruneInfeasibleExceptionEdges(CFG cfg,
                             org.apache.bcel.generic.MethodGen methodGen,
                             TypeDataflow typeDataflow)

Constructor.

Parameters:

cfg - the CFG to prune

methodGen - the method

typeDataflow - initialized TypeDataflow object for the CFG, indicating the types of all stack locations

Method Detail

execute

public void execute()
             throws ClassNotFoundException

Prune infeasible exception edges from the CFG. If the method returns normally, then the operation was successful, and the CFG should no longer contain infeasible exception edges. If ClassNotFoundException or DataflowAnalysisException are thrown, then the operation was unsuccessful, but the CFG is still valid because it was not modified. If a runtime exception is thrown, then the CFG may be partially modified and should be considered invalid.

Throws:

ClassNotFoundException

wasCFGModified

public boolean wasCFGModified()

Returns:

true if modified