edu.wisc.cs.stego.lib
Class GenericEditor

java.lang.Object
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  +--edu.wisc.cs.stego.CodeEditor
        |
        +--edu.wisc.cs.stego.modules.Unprofile
              |
              +--edu.wisc.cs.stego.lib.GenericEditor

public class GenericEditor

extends Unprofile

This class is a general purpose CodeEditor which can embed any watermark representable with the WatermarkGraph class. This is the default CodeEditor for the WM program.

See Also:

WatermarkGraph, CodeEditor, WM

Fields inherited from class edu.wisc.cs.stego.modules.Unprofile

graph, INIT_DESC, INIT_METHOD, INIT_POINT, NO_ARGS_VOID, num_points, POINT, PROFILE_CLASS, RECORD_POINT

Constructor Summary

protected

GenericEditor() Just a simple, protected default constructor.

Method Summary

static CodeEditor	buildCodeEditor(java.lang.String[] params) Returns a new instance of a GenericEditor object.
protected void	insertWatermarkCode(ClassFile cls, CodeAttribute code, int where) Given a class, the code of one of it's methods, and an index into that code, insert a portion of the watermark building code.
void	instrumentClasses(WatermarkGraph graph, ProfilePoint[] profile, java.util.Map classes, java.lang.String nodec) This method preforms the work of modifying the target program's classes.
protected void	instrumentNodeClass(ClassFile node, WatermarkGraph graph) Adds the necessary fields and methods to the class that is being used as the node class in the watermark graph.
protected void	setSignature(int nparams) Sets the member variable which is the signature of the wm$connect method for this watermark.

Methods inherited from class edu.wisc.cs.stego.modules.Unprofile

addDefaultConstructor, getProfilingMethodIndex, removeProfilePoint

Methods inherited from class java.lang.Object

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

Constructor Detail

GenericEditor

protected GenericEditor()

Just a simple, protected default constructor. No arguments are required.

Method Detail

buildCodeEditor

public static CodeEditor buildCodeEditor(java.lang.String[] params)

Returns a new instance of a GenericEditor object. Parameters are ignored. This method is a factory method for instantiating GenericEditor instances.

Parameters:

params - is ignored.

Returns:

a new instance of a GenericEditor object.

See Also:

CodeEditor.buildCodeEditor(java.lang.String[])

instrumentClasses

public void instrumentClasses(WatermarkGraph graph,
                              ProfilePoint[] profile,
                              java.util.Map classes,
                              java.lang.String nodec)

This method preforms the work of modifying the target program's classes. It performs some initialization, then calls the identical method in the Unprofile class to take advantage of that classes ability to locate and remove calls to the profiling methods.

Overrides:

instrumentClasses in class Unprofile

Parameters:

graph - the adjacency matrix of the watermark graph.

profile - the array of profile points.

classes - a map containing the classfiles, keyed on the classnames.

nodec - the name of the class to be used as the nodes in the graph.

See Also:

Unprofile

setSignature

protected void setSignature(int nparams)

Sets the member variable which is the signature of the wm$connect method for this watermark.

Parameters:

nparams - the number of integer parameters to wm$connect

instrumentNodeClass

protected void instrumentNodeClass(ClassFile node,
                                   WatermarkGraph graph)

Adds the necessary fields and methods to the class that is being used as the node class in the watermark graph. Field names are added with a prefix of wm$ to avoid symbol scope conflicts.

Overrides:

instrumentNodeClass in class Unprofile

Parameters:

node - the classfile representing the node class.

fields - the names of the pointer fields to add to the class.

insertWatermarkCode

protected void insertWatermarkCode(ClassFile cls,
                                   CodeAttribute code,
                                   int where)

Given a class, the code of one of it's methods, and an index into that code, insert a portion of the watermark building code.

Overrides:

insertWatermarkCode in class Unprofile

Parameters:

code - the code attribute in which to insert code.

where - the index at which to insert the code.