com.videobug.agent.weaver.method

Class LocalVariables

java.lang.Object

com.videobug.agent.weaver.method.LocalVariables

public class LocalVariables
extends Object

This object is to manage active local variables for each instruction.

Constructor Summary

Constructors

Constructor and Description
LocalVariables(List<?> localVariableNodes, org.objectweb.asm.tree.InsnList instructions) Initialize the object

Method Summary

Modifier and Type	Method and Description
org.objectweb.asm.tree.LocalVariableNode	getLoadVar(int variableIndex)
org.objectweb.asm.tree.LocalVariableNode	getStoreVar(int instructionIndex, int localVariableIndex)
void	visitLabel(org.objectweb.asm.Label label)

Methods inherited from class java.lang.Object

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

Constructor Detail

LocalVariables

public LocalVariables(List<?> localVariableNodes,
                      org.objectweb.asm.tree.InsnList instructions)

Initialize the object

Parameters:

localVariableNodes - represent the local variables.

instructions - is the list of instructions of the method

Method Detail

visitLabel

public void visitLabel(org.objectweb.asm.Label label)

Parameters:

label - Label object being visited Update active variables from the given label.

getLoadVar

public org.objectweb.asm.tree.LocalVariableNode getLoadVar(int variableIndex)

Parameters:

variableIndex - of an existing LOAD instruction

Returns:

a LocalVariableNode of an active variable corresponding to a specified variable index.

getStoreVar

public org.objectweb.asm.tree.LocalVariableNode getStoreVar(int instructionIndex,
                                                            int localVariableIndex)

Parameters:

instructionIndex - index of the instruction for the Store instruction

localVariableIndex - index of the local variable being stored

Returns:

a LocalVariableNode for a specified variable. It requires instruction index, because the specified instruction makes a variable active. If the instruction is not followed by a label (that is a start of a variable scope), this method searches an active variable.