com.techtrader.modules.tools.bytecode
Class MathInstruction

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

public class MathInstruction

extends Instruction

Represents one of the math operations defined in the Constants interface. Changing the type or operation of the instruction will automatically update the underlying opcode. Note, however, that some operations cannot act on floating point types.

Author:

Abe White

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

_byteIndex, _opcode, _opcodeTypes, _owner

Constructor Summary

protected	MathInstruction(Code owner)
protected	MathInstruction(Code owner, int opcode, int operation, Class type)

Method Summary

void	acceptVisit(BCVisitor visit) Accept a visit from a BCVisitor, calling the appropriate methods to notify the visitor that it has entered this entity, and to provide it with the proper callbacks for each sub-entity owned by this object.
protected void	copy(Instruction orig)
boolean	equals(Object other) MathInstructions are equal if they have the same operation and type, or the type of either is unset.
int	getOperation() Return the operation for this math instruction; will be one of the math constant defined in Constants, or -1 if unset.
int	getStackChange() Return the number of stack positions this instruction pushes or pops during its execution.
Class	getType() Get the type of args to operation on; will be one of: int, float, double, long.
MathInstruction	setOperation(int operation) Set the math operation to be performed.
MathInstruction	setType(Class type) Set the type of args to operate on.
MathInstruction	setTypeName(String name) Set the type to load by name.

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

MathInstruction

protected MathInstruction(Code owner)

MathInstruction

protected MathInstruction(Code owner,
                          int opcode,
                          int operation,
                          Class type)

Method Detail

setOperation

public MathInstruction setOperation(int operation)

Set the math operation to be performed. This should be one of the math constant defined in Constants.

Returns:

this Instruction, for method chaining

getOperation

public int getOperation()

Return the operation for this math instruction; will be one of the math constant defined in Constants, or -1 if unset.

getType

public Class getType()

Get the type of args to operation on; will be one of: int, float, double, long. If the type has not been set, this method will return null.

setType

public MathInstruction setType(Class type)

Set the type of args to operate on. Types without direct support are demoted to int.class.

Returns:

this Instruction, for method chaining

setTypeName

public MathInstruction setTypeName(String name)

Set the type to load by name.

Returns:

this Instruction, for method chaining

See Also:

setType(java.lang.Class)

equals

public boolean equals(Object other)

MathInstructions are equal if they have the same operation and type, or the type of either is unset.

Overrides:

equals in class Instruction

getStackChange

public int getStackChange()

Description copied from class: Instruction

Return the number of stack positions this instruction pushes or pops during its execution.

Overrides:

getStackChange in class Instruction

Tags copied from class: Instruction

Returns:

0 if the stack is not affected by this instruction, a positive number if it pushes onto the stack, and a negative number if it pops from the stack

copy

protected void copy(Instruction orig)

Overrides:

copy in class Instruction

acceptVisit

public void acceptVisit(BCVisitor visit)

Description copied from interface: VisitAcceptor

Accept a visit from a BCVisitor, calling the appropriate methods to notify the visitor that it has entered this entity, and to provide it with the proper callbacks for each sub-entity owned by this object.

Overrides:

acceptVisit in class Instruction