gov.nasa.jpf.jvm.bytecode

Class GETFIELD

java.lang.Object

gov.nasa.jpf.vm.Instruction

gov.nasa.jpf.jvm.JVMInstruction

gov.nasa.jpf.jvm.bytecode.FieldInstruction

gov.nasa.jpf.jvm.bytecode.InstanceFieldInstruction

gov.nasa.jpf.jvm.bytecode.GETFIELD

All Implemented Interfaces:

InstructionVisitorAcceptor, VariableAccessor, Cloneable

public class GETFIELD
extends InstanceFieldInstruction

Fetch field from object ..., objectref => ..., value

Field Summary

Fields inherited from class gov.nasa.jpf.jvm.bytecode.InstanceFieldInstruction

lastThis

Fields inherited from class gov.nasa.jpf.jvm.bytecode.FieldInstruction

className, fi, fname, isReferenceField, lastValue, size, varId

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

attr, insnIndex, mi, position

Constructor Summary

Constructors

Constructor and Description
GETFIELD(String fieldName, String classType, String fieldDescriptor)

Method Summary

Methods

Modifier and Type	Method and Description
void	accept(InstructionVisitor 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()
int	getLength() return the length in bytes of this instruction.
boolean	isRead()
ElementInfo	peekElementInfo(ThreadInfo ti) this one can be used from a choiceGeneratorSet() or executeInstruction() context, since it peeks 'this' from the operand stack (enter didn't pop the value yet) it' less efficient than getLastElementInfo() from a instructionExecuted context
protected void	popOperands1(StackFrame frame)
protected void	popOperands2(StackFrame frame)

Methods inherited from class gov.nasa.jpf.jvm.bytecode.InstanceFieldInstruction

getFieldDescriptor, getFieldInfo, getLastElementInfo, getLastThis, isNewPorFieldBoundary, isSchedulingRelevant, isSkippedFinalField

Methods inherited from class gov.nasa.jpf.jvm.bytecode.FieldInstruction

createAndSetSharedFieldAccessCG, createAndSetSharedObjectExposureCG, getClassName, getFieldName, getFieldSize, getId, getLastValue, getVariableId, init, isLockProtected, isMonitorEnterPrologue, isReferenceField, put, put1, put2, setField

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, isBackJump, isCompleted, isExtendedInstruction, isFirstInstruction, isSchedulingRelevant, removeAttr, replaceAttr, requiresClinitExecution, setAttr, setContext, setLocation, setMethodInfo, toString, typeSafeClone

Methods inherited from class java.lang.Object

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

Constructor Detail

GETFIELD

public GETFIELD(String fieldName,
        String classType,
        String fieldDescriptor)

Method Detail

popOperands1

protected void popOperands1(StackFrame frame)

Specified by:

popOperands1 in class FieldInstruction

popOperands2

protected void popOperands2(StackFrame frame)

Specified by:

popOperands2 in class FieldInstruction

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 class Instruction

peekElementInfo

public ElementInfo peekElementInfo(ThreadInfo ti)

Description copied from class: InstanceFieldInstruction

this one can be used from a choiceGeneratorSet() or executeInstruction() context, since it peeks 'this' from the operand stack (enter didn't pop the value yet) it' less efficient than getLastElementInfo() from a instructionExecuted context

Specified by:

peekElementInfo in class InstanceFieldInstruction

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

isRead

public boolean isRead()

Specified by:

isRead in class FieldInstruction

accept

public void accept(InstructionVisitor insVisitor)

Specified by:

accept in interface InstructionVisitorAcceptor

Overrides:

accept in class InstanceFieldInstruction