com.techtrader.modules.tools.bytecode
Class LocalVariableInstruction

java.lang.Object
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  +--com.techtrader.modules.tools.bytecode.Instruction
        |
        +--com.techtrader.modules.tools.bytecode.LocalVariableInstruction

Direct Known Subclasses:

IIncInstruction, RetInstruction, TypedLocalVariableInstruction

public abstract class LocalVariableInstruction

extends Instruction

Represents an instruction that has an argument of an index into the local variable array of the current frame. This includes most of the LOAD and STORE instructions.

The local variable array size is fixed by the 'maxLocals' property of the code block. Long and double types take up 2 local variable indexes.

Parameter values to methods are loaded into the local variable array prior to the execution of the first instruction. The 0th-index of the array is set to the instance of the class the method is being invoked on.

Author:

Abe White

Field Summary

protected int

_index

Fields inherited from class com.techtrader.modules.tools.bytecode.Instruction

_byteIndex, _opcode, _opcodeTypes, _owner

Constructor Summary

protected

LocalVariableInstruction(Code owner)

Method Summary

protected void	calculateOpCode() Subclasses with variable opcodes can use this method to be notified that information possibly affecting the opcode has been changed.
protected void	copy(Instruction orig)
boolean	equals(Object other) Two local variable instructions are equal if the local index they reference is equal or if either index is 0/unset.
int	getIndex() Get the index of the local variable that this instruction should operate on.
LocalVariableInstruction	setIndex(int index) Set the index of the local variable that this instruction should operate on.

Methods inherited from class com.techtrader.modules.tools.bytecode.Instruction

acceptVisit, getByteIndex, getLength, getName, getOpCode, getOwner, getStackChange, invalidate, readData, setByteIndex, setOpCode, writeData

Methods inherited from class java.lang.Object

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

Field Detail

_index

protected int _index

Constructor Detail

LocalVariableInstruction

protected LocalVariableInstruction(Code owner)

Method Detail

setIndex

public LocalVariableInstruction setIndex(int index)

Set the index of the local variable that this instruction should operate on.

Returns:

this Instruction, for method chaining

getIndex

public int getIndex()

Get the index of the local variable that this instruction should operate on.

equals

public boolean equals(Object other)

Two local variable instructions are equal if the local index they reference is equal or if either index is 0/unset.

Overrides:

equals in class Instruction

calculateOpCode

protected void calculateOpCode()

Subclasses with variable opcodes can use this method to be notified that information possibly affecting the opcode has been changed.

copy

protected void copy(Instruction orig)

Overrides:

copy in class Instruction