Package com.tonic.analysis.instruction

Class DupInstruction

java.lang.Object

com.tonic.analysis.instruction.Instruction

com.tonic.analysis.instruction.DupInstruction

public class DupInstruction
extends Instruction

Represents the JVM DUP instruction and its variants.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	DupInstruction.DupType	The stack-duplication variants (DUP through DUP2_X2), each pairing a JVM opcode with its mnemonic.

Constructor Summary

Constructors

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

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.
DupInstruction.DupType	getType()
String	toString()	Returns a string representation of the instruction.
void	write(DataOutputStream dos)	Writes the DUP 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

DupInstruction

public DupInstruction(int opcode,
                      int offset)

Constructs a DupInstruction.

Parameters:

opcode - The opcode of the instruction.

offset - The bytecode offset of the instruction.

Throws:

IllegalArgumentException - if the opcode is not a DUP-family opcode

Method Detail

getType

public DupInstruction.DupType getType()

Returns:

the duplication variant

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 DUP 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 based on the DUP type.

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).

toString

public String toString()

Returns a string representation of the instruction.

Overrides:

toString in class Instruction

Returns:

The mnemonic of the DUP instruction.