gov.nasa.jpf.jvm.bytecode

Class GOTO

java.lang.Object

gov.nasa.jpf.vm.Instruction

gov.nasa.jpf.jvm.JVMInstruction

gov.nasa.jpf.jvm.bytecode.GOTO

All Implemented Interfaces:

InstructionVisitorAcceptor, Cloneable

Direct Known Subclasses:

GOTO_W

public class GOTO
extends JVMInstruction

Branch always No change <2do> store this as code insnIndex, not as bytecode position

Field Summary

Fields

Modifier and Type	Field and Description
protected int	targetPosition

Fields inherited from class gov.nasa.jpf.vm.Instruction

attr, insnIndex, mi, position

Constructor Summary

Constructors

Constructor and Description
GOTO(int targetPosition)

Method Summary

Methods

Modifier and Type	Method and Description
void	accept(InstructionVisitor insVisitor)
Instruction	execute(ThreadInfo th) this is the real workhorse returns next instruction to enter in this thread <2do> it's unfortunate we roll every side effect into this method, because it diminishes the value of the 'executeInstruction' notification: all insns that require some sort of late binding (InvokeVirtual, GetField, ..) are not yet fully analyzable (e.g.
int	getByteCode()
int	getLength() return the length in bytes of this instruction.
Instruction	getTarget()
boolean	isBackJump() answer if this is a potential loop closing jump
String	toString()
Instruction	typeSafeClone(MethodInfo mi) this is overridden by any Instruction that use a cache for class or method to provide a type safe cloning

Methods inherited from class gov.nasa.jpf.vm.Instruction

addAttr, attrIterator, attrIterator, cleanupTransients, getAttr, getAttr, getFileLocation, getFilePos, getInstructionIndex, getLineNumber, getMethodInfo, getMnemonic, getNext, getNext, getNextAttr, getPosition, getPrev, getSourceLine, getSourceLocation, getSourceOrLocation, hasAttr, hasAttr, init, isCompleted, isExtendedInstruction, isFirstInstruction, isSchedulingRelevant, removeAttr, replaceAttr, requiresClinitExecution, setAttr, setContext, setLocation, setMethodInfo

Methods inherited from class java.lang.Object

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

Field Detail

targetPosition

protected int targetPosition

Constructor Detail

GOTO

public GOTO(int targetPosition)

Method Detail

execute

public Instruction execute(ThreadInfo th)

Description copied from class: Instruction

this is the real workhorse returns next instruction to enter in this thread <2do> it's unfortunate we roll every side effect into this method, because it diminishes the value of the 'executeInstruction' notification: all insns that require some sort of late binding (InvokeVirtual, GetField, ..) are not yet fully analyzable (e.g. the callee of InvokeVirtuals is not known yet), putting the burden of duplicating the related code of enter() in the listener. It would be better if we factor this 'prepareExecution' out of enter()

Specified by:

execute in class Instruction

isBackJump

public boolean isBackJump()

Description copied from class: Instruction

answer if this is a potential loop closing jump

Overrides:

isBackJump in class Instruction

getTarget

public Instruction getTarget()

getLength

public int getLength()

Description copied from class: Instruction

return the length in bytes of this instruction. override if this is not 1

Overrides:

getLength in class Instruction

getByteCode

public int getByteCode()

Specified by:

getByteCode in class Instruction

toString

public String toString()

Overrides:

toString in class Instruction

accept

public void accept(InstructionVisitor insVisitor)

typeSafeClone

public Instruction typeSafeClone(MethodInfo mi)

Description copied from class: Instruction

this is overridden by any Instruction that use a cache for class or method to provide a type safe cloning

Overrides:

typeSafeClone in class Instruction