Package com.tonic.analysis.instruction

Class GotoInstruction

java.lang.Object

com.tonic.analysis.instruction.Instruction

com.tonic.analysis.instruction.GotoInstruction

public class GotoInstruction
extends Instruction

Represents the JVM GOTO and GOTO_W instructions.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	GotoInstruction.GotoType	The goto widths (16-bit GOTO vs 32-bit GOTO_W), each pairing a JVM opcode with its mnemonic.

Constructor Summary

Constructors

Constructor	Description
GotoInstruction(int opcode, int offset, int branchOffset)	Constructs a GotoInstruction.
GotoInstruction(int opcode, int offset, short branchOffset)	Constructs a GotoInstruction.

Method Summary

Modifier and Type	Method	Description
void	accept(AbstractBytecodeVisitor visitor)	Accepts a visitor for bytecode analysis.
short	getBranchOffset()	Returns the branch offset.
int	getBranchOffsetWide()	Returns the wide branch offset.
int	getLocalChange()	Returns the change in local variables caused by this instruction.
int	getStackChange()	Returns the change in stack size caused by this instruction.
GotoInstruction.GotoType	getType()
String	toString()	Returns a string representation of the instruction.
void	write(DataOutputStream dos)	Writes the GOTO opcode and its operands 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

GotoInstruction

public GotoInstruction(int opcode,
                       int offset,
                       int branchOffset)

Constructs a GotoInstruction.

Parameters:

opcode - The opcode of the instruction.

offset - The bytecode offset of the instruction.

branchOffset - The branch target offset relative to current instruction.

Throws:

IllegalArgumentException - if the opcode is not GOTO or GOTO_W

GotoInstruction

public GotoInstruction(int opcode,
                       int offset,
                       short branchOffset)

Constructs a GotoInstruction.

Parameters:

opcode - The opcode of the instruction.

offset - The bytecode offset of the instruction.

branchOffset - The branch target offset relative to current instruction.

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.

getType

public GotoInstruction.GotoType getType()

Returns:

the type

write

public void write(DataOutputStream dos)
           throws IOException

Writes the GOTO opcode and its operands 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 (none).

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).

getBranchOffset

public short getBranchOffset()

Returns the branch offset.

Returns:

The branch target offset.

getBranchOffsetWide

public int getBranchOffsetWide()

Returns the wide branch offset.

Returns:

The wide branch target offset.

toString

public String toString()

Returns a string representation of the instruction.

Overrides:

toString in class Instruction

Returns:

The mnemonic and branch target of the instruction.