Package org.apache.bcel.generic

Class GETFIELD

java.lang.Object

org.apache.bcel.generic.Instruction

org.apache.bcel.generic.CPInstruction

org.apache.bcel.generic.FieldOrMethod

org.apache.bcel.generic.FieldInstruction

org.apache.bcel.generic.GETFIELD

All Implemented Interfaces:

java.lang.Cloneable, ExceptionThrower, IndexedInstruction, LoadClass, StackConsumer, StackProducer, TypedInstruction

public class GETFIELD
extends FieldInstruction
implements ExceptionThrower, StackConsumer, StackProducer

GETFIELD - Fetch field from object

 Stack: ..., objectref -> ..., value
 

OR

 Stack: ..., objectref -> ..., value.word1, value.word2
 

Field Summary

Fields inherited from class org.apache.bcel.generic.CPInstruction

index

Fields inherited from class org.apache.bcel.generic.Instruction

EMPTY_ARRAY, length, opcode

Constructor Summary

Constructors

Constructor	Description
GETFIELD()	Empty constructor needed for Instruction.readInstruction.
GETFIELD(int index)	Constructs a GETFIELD instruction.

Method Summary

Modifier and Type	Method	Description
void	accept(Visitor v)	Call corresponding visitor method(s).
java.lang.Class<?>[]	getExceptions()	Gets the exceptions that may be thrown by this instruction.
int	produceStack(ConstantPoolGen cpg)	This method also gives right results for instructions whose effect on the stack depends on the constant pool entry they reference.

Methods inherited from class org.apache.bcel.generic.FieldInstruction

getFieldName, getFieldSize, getFieldType, getType, toString

Methods inherited from class org.apache.bcel.generic.FieldOrMethod

getClassName, getClassType, getLoadClassType, getName, getReferenceType, getSignature

Methods inherited from class org.apache.bcel.generic.CPInstruction

dump, getIndex, initFromFile, setIndex, toString

Methods inherited from class org.apache.bcel.generic.Instruction

consumeStack, copy, dispose, equals, getComparator, getLength, getName, getOpcode, hashCode, isValidByte, isValidShort, readInstruction, setComparator, setLength, setOpcode, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.bcel.generic.StackConsumer

consumeStack

Constructor Detail

GETFIELD

GETFIELD()

Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.

GETFIELD

public GETFIELD(int index)

Constructs a GETFIELD instruction.

Parameters:

index - the constant pool index.

Method Detail

accept

public void accept(Visitor v)

Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call methods according to the class hierarchy in descending order, that is, the most specific visitXXX() call comes last.

Specified by:

accept in class Instruction

Parameters:

v - Visitor object.

getExceptions

public java.lang.Class<?>[] getExceptions()

Description copied from interface: ExceptionThrower

Gets the exceptions that may be thrown by this instruction.

Specified by:

getExceptions in interface ExceptionThrower

Returns:

the exceptions that may be thrown by this instruction.

produceStack

public int produceStack(ConstantPoolGen cpg)

Description copied from class: Instruction

This method also gives right results for instructions whose effect on the stack depends on the constant pool entry they reference.

Specified by:

produceStack in interface StackProducer

Overrides:

produceStack in class Instruction

Parameters:

cpg - the constant pool generator.

Returns:

Number of words produced onto stack by this instruction, or Constants.UNPREDICTABLE, if this cannot be computed statically