Package com.tonic.analysis.instruction

Class Instruction

java.lang.Object

com.tonic.analysis.instruction.Instruction

Direct Known Subclasses:

AALoadInstruction, AAStoreInstruction, AConstNullInstruction, ALoadInstruction, ANewArrayInstruction, ArithmeticInstruction, ArithmeticShiftInstruction, ArrayLengthInstruction, AStoreInstruction, ATHROWInstruction, BALOADInstruction, BAStoreInstruction, BipushInstruction, CALoadInstruction, CAStoreInstruction, CheckCastInstruction, CompareInstruction, ConditionalBranchInstruction, ConversionInstruction, DALoadInstruction, DAStoreInstruction, DConstInstruction, DLoadInstruction, DNegInstruction, DStoreInstruction, DupInstruction, FALoadInstruction, FAStoreInstruction, FConstInstruction, FLoadInstruction, FNegInstruction, FStoreInstruction, GetFieldInstruction, GotoInstruction, I2LInstruction, IALoadInstruction, IAndInstruction, IAStoreInstruction, IConstInstruction, IIncInstruction, ILoadInstruction, INegInstruction, InstanceOfInstruction, InvokeDynamicInstruction, InvokeInterfaceInstruction, InvokeSpecialInstruction, InvokeStaticInstruction, InvokeVirtualInstruction, IOrInstruction, IStoreInstruction, IXorInstruction, JsrInstruction, LALoadInstruction, LandInstruction, LAStoreInstruction, LConstInstruction, Ldc2WInstruction, LdcInstruction, LdcWInstruction, LLoadInstruction, LNegInstruction, LookupSwitchInstruction, LorInstruction, LStoreInstruction, LXorInstruction, MethodReturnInstruction, MonitorEnterInstruction, MonitorExitInstruction, MultiANewArrayInstruction, NarrowingConversionInstruction, NewObjectInstruction, NewPrimitiveArrayInstruction, NopInstruction, Pop2Instruction, PopInstruction, PutFieldInstruction, RetInstruction, SALoadInstruction, SAStoreInstruction, SipushInstruction, SwapInstruction, TableSwitchInstruction, UnknownInstruction, WideIIncInstruction, WideInstruction

public abstract class Instruction
extends Object

Represents a single bytecode instruction.

Constructor Summary

Constructors

Constructor	Description
Instruction(int opcode, int offset, int length)	Constructs an Instruction.

Method Summary

Modifier and Type	Method	Description
abstract void	accept(AbstractBytecodeVisitor visitor)	Accepts a visitor for bytecode analysis.
int	getLength()
abstract int	getLocalChange()	Returns the change in local variables caused by this instruction.
int	getOffset()
int	getOpcode()
abstract int	getStackChange()	Returns the change in stack size caused by this instruction.
void	setOffset(int offset)	Updates this instruction's bytecode offset.
String	toString()
abstract void	write(DataOutputStream dos)	Writes the instruction to the DataOutputStream.

Methods inherited from class java.lang.Object

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

Constructor Detail

Instruction

public Instruction(int opcode,
                   int offset,
                   int length)

Constructs an Instruction.

Parameters:

opcode - The opcode of the instruction.

offset - The bytecode offset of the instruction.

length - The length of the instruction in bytes.

Method Detail

getOpcode

public int getOpcode()

Returns:

the opcode

getOffset

public int getOffset()

Returns:

the offset

getLength

public int getLength()

Returns:

the encoded length of the instruction in bytes

setOffset

public void setOffset(int offset)

Updates this instruction's bytecode offset.

Parameters:

offset - the new bytecode offset

accept

public abstract void accept(AbstractBytecodeVisitor visitor)

Accepts a visitor for bytecode analysis.

Parameters:

visitor - The visitor to accept.

write

public abstract void write(DataOutputStream dos)
                    throws IOException

Writes the instruction to the DataOutputStream.

Parameters:

dos - The DataOutputStream to write to.

Throws:

IOException - If an I/O error occurs.

getStackChange

public abstract int getStackChange()

Returns the change in stack size caused by this instruction.

Returns:

The stack size change.

getLocalChange

public abstract int getLocalChange()

Returns the change in local variables caused by this instruction.

Returns:

The local variables size change.

toString

public String toString()

Overrides:

toString in class Object