com.techtrader.modules.tools.bytecode
Class CmpInstruction

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

public class CmpInstruction

extends Instruction

An instruction comparing two stack values that varies depending on the value type.

Author:

Abe White

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

_byteIndex, _opcode, _opcodeTypes, _owner

Constructor Summary

protected	CmpInstruction(Code owner)
protected	CmpInstruction(Code owner, int opcode, Class type, int nan)

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) Two cmp instructions are equal if the type and NaN value they reference is equal or the type of either instruction is unset.
int	getNaNValue() Get the number that will be placed on the stack if this instruction is of type float or double and one of the operands is NaN.
int	getStackChange() Return the number of stack positions this instruction pushes or pops during its execution.
Class	getType() Get the type of value to operate on; this is one of: float, double, long.
String	getTypeName() Get the type of value to operate on; this is one of: float, double, long.
void	setNaNValue(int nan) Set the number that will be placed on the stack if this instruction is of type float or double and one of the operands is NaN.
CmpInstruction	setType(Class type) Set the type of value to operate on; primitives that have no direct support (byte, char, boolean, int) will be conerted to long.class.
CmpInstruction	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

CmpInstruction

protected CmpInstruction(Code owner)

CmpInstruction

protected CmpInstruction(Code owner,
                         int opcode,
                         Class type,
                         int nan)

Method Detail

getType

public Class getType()

Get the type of value to operate on; this is one of: float, double, long.

getTypeName

public String getTypeName()

Get the type of value to operate on; this is one of: float, double, long.

setType

public CmpInstruction setType(Class type)

Set the type of value to operate on; primitives that have no direct support (byte, char, boolean, int) will be conerted to long.class.

Returns:

this Instruction, for method chaining

setTypeName

public CmpInstruction setTypeName(String name)

Set the type to load by name.

Returns:

this Instruction, for method chaining

See Also:

setType(java.lang.Class)

getNaNValue

public int getNaNValue()

Get the number that will be placed on the stack if this instruction is of type float or double and one of the operands is NaN. The return value will be either 1 or -1.

setNaNValue

public void setNaNValue(int nan)

Set the number that will be placed on the stack if this instruction is of type float or double and one of the operands is NaN. The value must be either 1 or -1.

equals

public boolean equals(Object other)

Two cmp instructions are equal if the type and NaN value they reference is equal or the type of either instruction 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

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

copy

protected void copy(Instruction orig)

Overrides:

copy in class Instruction