gov.nasa.jpf.jvm.bytecode

Class GETFIELD

java.lang.Object

gov.nasa.jpf.vm.Instruction

gov.nasa.jpf.vm.bytecode.FieldInstruction

gov.nasa.jpf.vm.bytecode.InstanceFieldInstruction

gov.nasa.jpf.jvm.bytecode.JVMInstanceFieldInstruction

gov.nasa.jpf.jvm.bytecode.GETFIELD

All Implemented Interfaces:

JVMFieldInstruction, JVMInstruction, Attributable, InstructionInterface, ReadInstruction, ReadOrWriteInstruction, java.lang.Cloneable

public class GETFIELD
extends JVMInstanceFieldInstruction
implements ReadInstruction

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

Field Summary

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

lastThis

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

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

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

attr, insnIndex, mi, position

Constructor Summary

Constructors

Constructor and Description
GETFIELD(java.lang.String fieldName, java.lang.String classType, java.lang.String fieldDescriptor)

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()
int	getLength() return the length in bytes of this instruction.
int	getObjectSlot(StackFrame frame)
boolean	isMonitorEnterPrologue() is this instruction part of a monitorenter code pattern
boolean	isRead()
ElementInfo	peekElementInfo(ThreadInfo ti)

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

getElementInfo, getFieldDescriptor, getFieldInfo, getLastElementInfo, getLastThis, toPostExecString

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

getClassName, getFieldName, getFieldSize, getId, getLastValue, getVariableId, isReferenceField, setField, toString

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

addAttr, asInstruction, 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, 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.ReadOrWriteInstruction

getElementInfo

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

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

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

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

Methods inherited from interface gov.nasa.jpf.jvm.bytecode.JVMFieldInstruction

getFieldInfo, getFieldName, getLastValue, isReferenceField

Constructor Detail

GETFIELD

public GETFIELD(java.lang.String fieldName,
                java.lang.String classType,
                java.lang.String fieldDescriptor)

Method Detail

getObjectSlot

public int getObjectSlot(StackFrame frame)

Specified by:

getObjectSlot in class InstanceFieldInstruction

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

peekElementInfo

public ElementInfo peekElementInfo(ThreadInfo ti)

Specified by:

peekElementInfo in interface JVMFieldInstruction

Specified by:

peekElementInfo in class FieldInstruction

isMonitorEnterPrologue

public boolean isMonitorEnterPrologue()

Description copied from class: Instruction

is this instruction part of a monitorenter code pattern

Overrides:

isMonitorEnterPrologue in class FieldInstruction

getLength

public int getLength()

Description copied from class: Instruction

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

Specified by:

getLength in interface InstructionInterface

Overrides:

getLength in class Instruction

getByteCode

public int getByteCode()

Specified by:

getByteCode in interface InstructionInterface

isRead

public boolean isRead()

Specified by:

isRead in interface ReadOrWriteInstruction

Specified by:

isRead in class FieldInstruction

accept

public void accept(JVMInstructionVisitor insVisitor)

Specified by:

accept in interface JVMInstruction

Overrides:

accept in class JVMInstanceFieldInstruction