Package com.tonic.analysis.instruction

Class CompareInstruction

java.lang.Object

com.tonic.analysis.instruction.Instruction

com.tonic.analysis.instruction.CompareInstruction

public class CompareInstruction
extends Instruction

Represents the compare instructions (LCMP, FCMPL, FCMPG, DCMPL, DCMPG).

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	CompareInstruction.CompareType	The compare operation kinds, each pairing a JVM opcode with its mnemonic.

Constructor Summary

Constructors

Constructor	Description
CompareInstruction(int opcode, int offset)	Constructs a CompareInstruction.

Method Summary

Modifier and Type	Method	Description
void	accept(AbstractBytecodeVisitor visitor)	Accepts a visitor for bytecode analysis.
int	getLocalChange()	Returns the change in local variables caused by this instruction.
int	getStackChange()	Returns the change in stack size caused by this instruction.
CompareInstruction.CompareType	getType()	Returns the type of compare operation.
String	toString()	Returns a string representation of the instruction.
void	write(DataOutputStream dos)	Writes the compare opcode to the DataOutputStream.

Methods inherited from class com.tonic.analysis.instruction.Instruction

getLength, getOffset, getOpcode, setOffset

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

CompareInstruction

public CompareInstruction(int opcode,
                          int offset)

Constructs a CompareInstruction.

Parameters:

opcode - The opcode of the instruction.

offset - The bytecode offset of the instruction.

Throws:

IllegalArgumentException - if the opcode is not a compare opcode

Method Detail

accept

public void accept(AbstractBytecodeVisitor visitor)

Description copied from class: Instruction

Accepts a visitor for bytecode analysis.

Specified by:

accept in class Instruction

Parameters:

visitor - The visitor to accept.

write

public void write(DataOutputStream dos)
           throws IOException

Writes the compare opcode to the DataOutputStream.

Specified by:

write in class Instruction

Parameters:

dos - The DataOutputStream to write to.

Throws:

IOException - If an I/O error occurs.

getStackChange

public int getStackChange()

Returns the change in stack size caused by this instruction.

Specified by:

getStackChange in class Instruction

Returns:

The stack size change (pops two values, pushes one int).

getLocalChange

public int getLocalChange()

Returns the change in local variables caused by this instruction.

Specified by:

getLocalChange in class Instruction

Returns:

The local variables size change (none).

getType

public CompareInstruction.CompareType getType()

Returns the type of compare operation.

Returns:

The CompareType enum value.

toString

public String toString()

Returns a string representation of the instruction.

Overrides:

toString in class Instruction

Returns:

The mnemonic of the compare instruction.