gov.nasa.jpf.jvm.bytecode

Class RUNSTART

java.lang.Object

gov.nasa.jpf.vm.Instruction

gov.nasa.jpf.jvm.bytecode.RUNSTART

All Implemented Interfaces:

JVMInstruction, Attributable, InstructionInterface, java.lang.Cloneable

public class RUNSTART
extends Instruction
implements JVMInstruction

this is an artificial instruction that is automatically prepended to a run()/main() method call. The main purpose is to have a special instruction marking the beginning of a new thread execution which does not cause CGs or is otherwise subject to execution semantics that change the program state. For instance, without it we would have to add a new ThreadInfo state to determine if the first instruction within this thread was re-executed or just happens to be the first transition we execute within this thread

Field Summary

Fields

Modifier and Type	Field and Description
static int	OPCODE

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

attr, insnIndex, mi, position

Constructor Summary

Constructors

Constructor and Description
RUNSTART()

Method Summary

Modifier and Type	Method and Description
void	accept(JVMInstructionVisitor insVisitor)
Instruction	execute(ThreadInfo ti) 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()
boolean	isExtendedInstruction() is this one of our own, artificial insns?

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

addAttr, asInstruction, attrIterator, attrIterator, cleanupTransients, getAttr, getAttr, getFileLocation, getFilePos, getInstructionIndex, getLength, getLineNumber, getMethodInfo, getMnemonic, getNext, getNext, getNextAttr, getPosition, getPrev, getSourceLine, getSourceLocation, getSourceOrLocation, hasAttr, hasAttr, init, isBackJump, isCompleted, isFirstInstruction, isMonitorEnterPrologue, isSchedulingRelevant, removeAttr, replaceAttr, requiresClinitExecution, setAttr, setContext, setLocation, setMethodInfo, toPostExecString, toString, typeSafeClone

Methods inherited from class java.lang.Object

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

Methods inherited from interface gov.nasa.jpf.vm.bytecode.InstructionInterface

asInstruction, getFileLocation, getFilePos, getInstructionIndex, getLength, getLineNumber, getMethodInfo, getMnemonic, getNext, getNext, getPosition, getPrev, getSourceLine, getSourceLocation, isBackJump, isCompleted, isFirstInstruction, toPostExecString

Methods inherited from interface gov.nasa.jpf.util.Attributable

addAttr, attrIterator, attrIterator, getAttr, getAttr, getNextAttr, hasAttr, hasAttr, removeAttr, replaceAttr, setAttr

Field Detail

OPCODE

public static final int OPCODE

See Also:

Constant Field Values

Constructor Detail

RUNSTART

public RUNSTART()

Method Detail

execute

public Instruction execute(ThreadInfo ti)

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 interface InstructionInterface

Specified by:

execute in class Instruction

getByteCode

public int getByteCode()

Specified by:

getByteCode in interface InstructionInterface

isExtendedInstruction

public boolean isExtendedInstruction()

Description copied from class: Instruction

is this one of our own, artificial insns?

Specified by:

isExtendedInstruction in interface InstructionInterface

Overrides:

isExtendedInstruction in class Instruction

accept

public void accept(JVMInstructionVisitor insVisitor)

Specified by:

accept in interface JVMInstruction