org.multijava.util.classfile
Class InstructionHandle

java.lang.Object
  org.multijava.util.classfile.AbstractInstructionAccessor
      org.multijava.util.classfile.InstructionHandle

All Implemented Interfaces:

InstructionAccessor

class InstructionHandle

extends AbstractInstructionAccessor

Field Summary
private  int	index
private  Instruction	insn
private  InstructionHandle	next
private  CodePosition	position
private  int	stackHeight

 

Constructor Summary

InstructionHandle(Instruction insn, InstructionHandle prev)           Creates a new instruction handle.

 

Method Summary
void	attachTo(AccessorContainer container)           Notifies this handle that is has been attached to the specified container.
(package private)  boolean	checkInstruction(CodeEnv env, int curStack)           Verifies the enclosed instruction and computes the stack height.
(package private)  void	dump()
Instruction	getInstruction()           Returns the enclosed instruction.
(package private)  int	getLocalVar()           Returns the maximum index of local vars used by this instruction.
InstructionHandle	getNext()           Returns the handle of the next instruction in textual order.
(package private)  CodePosition	getPosition()           Gets the position of current instruction
(package private)  int	getStackHeight()           Returns the stack height after execution of this instruction.
(package private)  void	setAddress()           Sets the final position of this instruction in the code array.
(package private)  boolean	setAddressAndAdvancePC(CodePosition position)           Sets the position of this instruction and return true if address is final

 

Methods inherited from class org.multijava.util.classfile.AbstractInstructionAccessor

transform

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

insn

private final Instruction insn

next

private InstructionHandle next

index

private int index

position

private CodePosition position

stackHeight

private int stackHeight

InstructionHandle

public InstructionHandle(Instruction insn,
                         InstructionHandle prev)

Creates a new instruction handle.

Parameters:

insn - the instruction

prev - the handle of the next instruction in textual order

getInstruction

public Instruction getInstruction()

Returns the enclosed instruction.

getNext

public InstructionHandle getNext()

Returns the handle of the next instruction in textual order.

attachTo

public void attachTo(AccessorContainer container)

Notifies this handle that is has been attached to the specified container.

getPosition

CodePosition getPosition()

Gets the position of current instruction

getStackHeight

final int getStackHeight()

Returns the stack height after execution of this instruction.

getLocalVar

final int getLocalVar()

Returns the maximum index of local vars used by this instruction.

checkInstruction

final boolean checkInstruction(CodeEnv env,
                               int curStack)
                        throws ClassFileFormatException

Verifies the enclosed instruction and computes the stack height.

Parameters:

env - the check environment

curStack - the stack height at the beginning of the execution of the instruction

Returns:

true iff the next instruction in textual order needs to be checked, i.e. this instruction has not been checked before and it can complete normally

Throws:

ClassFileFormatException - a problem was detected

setAddressAndAdvancePC

boolean setAddressAndAdvancePC(CodePosition position)

Sets the position of this instruction and return true if address is final

setAddress

void setAddress()

Sets the final position of this instruction in the code array.

dump

void dump()