Package edu.umd.cs.findbugs.ba.bcp

Class Opcode

java.lang.Object

edu.umd.cs.findbugs.ba.bcp.PatternElement

edu.umd.cs.findbugs.ba.bcp.Opcode

public class Opcode
extends PatternElement

PatternElement to match instructions with a particular opcode.

Author:

David Hovemeyer

See Also:

• PatternElement

Constructor Summary

Constructors

Constructor	Description
Opcode(int opcode)	Constructor.

Method Summary

Modifier and Type	Method	Description
boolean	acceptBranch(Edge edge, org.apache.bcel.generic.InstructionHandle source)	Return whether or not it is acceptable to take the given branch.
MatchResult	match(org.apache.bcel.generic.InstructionHandle handle, org.apache.bcel.generic.ConstantPoolGen cpg, ValueNumberFrame before, ValueNumberFrame after, BindingSet bindingSet)	Return whether or not this element matches the given instruction with the given Bindings in effect.
int	maxOccur()	Return the maximum number of instructions this PatternElement must match in the ByteCodePattern.
int	minOccur()	Return the minimum number of instructions this PatternElement must match in the ByteCodePattern.

Methods inherited from class edu.umd.cs.findbugs.ba.bcp.PatternElement

addOrCheckDefinition, allowTrailingEdges, dominatedBy, getDominatedBy, getLabel, getNext, label, lookup, setAllowTrailingEdges, setIndex, setNext, toString

Methods inherited from class java.lang.Object

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

Constructor Details

Opcode

public Opcode(int opcode)

Constructor.

Parameters:

opcode - the opcode to match

Method Details

match

public MatchResult match(org.apache.bcel.generic.InstructionHandle handle,
 org.apache.bcel.generic.ConstantPoolGen cpg,
 ValueNumberFrame before,
 ValueNumberFrame after,
 BindingSet bindingSet)
                  throws DataflowAnalysisException

Description copied from class: PatternElement

Return whether or not this element matches the given instruction with the given Bindings in effect.

Specified by:

match in class PatternElement

Parameters:

handle - the instruction

cpg - the ConstantPoolGen from the method

before - the ValueNumberFrame representing values in the Java stack frame just before the execution of the instruction

after - the ValueNumberFrame representing values in the Java stack frame just after the execution of the instruction

bindingSet - the set of Bindings

Returns:

if the match is successful, returns a MatchResult with the PatternElement and BindingSet; if the match is not successful, returns null

Throws:

DataflowAnalysisException

acceptBranch

public boolean acceptBranch(Edge edge,
 org.apache.bcel.generic.InstructionHandle source)

Description copied from class: PatternElement

Return whether or not it is acceptable to take the given branch.

Specified by:

acceptBranch in class PatternElement

Parameters:

edge - the Edge representing the branch

source - the source instruction of the branch

Returns:

true if the Edge is acceptable, false if not

minOccur

public int minOccur()

Description copied from class: PatternElement

Return the minimum number of instructions this PatternElement must match in the ByteCodePattern.

Specified by:

minOccur in class PatternElement

maxOccur

public int maxOccur()

Description copied from class: PatternElement

Return the maximum number of instructions this PatternElement must match in the ByteCodePattern.

Specified by:

maxOccur in class PatternElement