org.multijava.util.classfile
Class CodeInfo

java.lang.Object
  org.multijava.util.classfile.Attribute
      org.multijava.util.classfile.CodeInfo

Direct Known Subclasses:

SkippedCodeInfo

public class CodeInfo

extends Attribute

This class represents the Java virtual machine instructions and auxiliary information for a single method. VMS 4.7.3: Code Attribute. !!! graf 990904 add support for generic attributes.

Field Summary
private static AsciiConstant	attr
private  AttributeList	attributes
private  int	codeLength
static CodeInfo	DUM_INFO
private  HandlerInfo[]	handlers
private  Instruction[]	instructions
private  int	maxLocals
private  int	maxStack
private  int	paramCnt

 

Constructor Summary
protected	CodeInfo()           This constructor is only used by SkippedCodeInfo
	CodeInfo(DataInput in, ConstantPool cp)           Make up a new attribute
	CodeInfo(Instruction[] instructions, HandlerInfo[] handlers, LineNumberInfo[] lineNumbers, LocalVariableInfo[] localVariables)           Make up a new attribute

 

Method Summary
private  void	compactInstructions()
int	getCodeLength()           Returns the length in bytes of the instruction array.
HandlerInfo[]	getHandlers()           Returns handlers
Instruction[]	getInstructions()           Returns the instruction of code
LineNumberInfo[]	getLineNumbers()           Returns line number information
LocalVariableInfo[]	getLocalVariables()           Returns local variable information
int	getMaxLocals()           Returns the number of locals vars used in this method (including parameters).
int	getMaxStack()           Returns the highest value reached by the stack.
int	getParameterCount()           Gets the number of parameters for this method.
protected  int	getSize()           Returns the space in bytes used by this attribute in the classfile
protected  int	getTag()           Returns the attribute's tag
protected  void	resolveConstants(ConstantPool cp)           Insert or check location of constant value on constant pool
(package private)  void	setCodeLength(int codeLength)           Sets the length in bytes of the instruction array.
(package private)  void	setMaxLocals(int maxLocals)           Sets the number of locals var used by this method.
(package private)  void	setMaxStack(int maxStack)           Sets the highest value reached by the stack.
void	setParameterCount(int paramCnt)           Sets the number of parameters for this method.
void	transformAccessors(AccessorTransformer transformer)           Transforms the accessors contained in this class.
protected  void	write(ConstantPool cp, DataOutput out)           Write this class into the the file (out) getting data position from the constant pool

 

Methods inherited from class java.lang.Object

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

 

Field Detail

DUM_INFO

public static final CodeInfo DUM_INFO

attr

private static AsciiConstant attr

instructions

private Instruction[] instructions

handlers

private HandlerInfo[] handlers

paramCnt

private int paramCnt

maxStack

private int maxStack

maxLocals

private int maxLocals

codeLength

private int codeLength

attributes

private AttributeList attributes

CodeInfo

public CodeInfo(Instruction[] instructions,
                HandlerInfo[] handlers,
                LineNumberInfo[] lineNumbers,
                LocalVariableInfo[] localVariables)

Make up a new attribute

Parameters:

instructions - array of VM instructions

handlers - exception handlers

lineNumbers - line number information

localVariables - local variable information

CodeInfo

public CodeInfo(DataInput in,
                ConstantPool cp)
         throws IOException,
                ClassFileFormatException

Make up a new attribute

Parameters:

in - the stream to read from

cp - the constant pool

Throws:

IOException - an io problem has occured

ClassFileFormatException - attempt to write a bad classfile info

CodeInfo

protected CodeInfo()

This constructor is only used by SkippedCodeInfo

compactInstructions

private void compactInstructions()

transformAccessors

public void transformAccessors(AccessorTransformer transformer)
                        throws BadAccessorException

Transforms the accessors contained in this class.

Parameters:

transformer - the transformer used to transform accessors

Throws:

BadAccessorException

getTag

protected int getTag()

Returns the attribute's tag

getSize

protected int getSize()

Returns the space in bytes used by this attribute in the classfile

getInstructions

public Instruction[] getInstructions()

Returns the instruction of code

getHandlers

public HandlerInfo[] getHandlers()

Returns handlers

getLineNumbers

public LineNumberInfo[] getLineNumbers()

Returns line number information

getLocalVariables

public LocalVariableInfo[] getLocalVariables()

Returns local variable information

getCodeLength

public int getCodeLength()

Returns the length in bytes of the instruction array.

getMaxStack

public int getMaxStack()

Returns the highest value reached by the stack.

getMaxLocals

public int getMaxLocals()

Returns the number of locals vars used in this method (including parameters).

setParameterCount

public void setParameterCount(int paramCnt)

Sets the number of parameters for this method.

getParameterCount

public int getParameterCount()

Gets the number of parameters for this method.

setCodeLength

void setCodeLength(int codeLength)

Sets the length in bytes of the instruction array.

setMaxStack

void setMaxStack(int maxStack)

Sets the highest value reached by the stack.

setMaxLocals

void setMaxLocals(int maxLocals)

Sets the number of locals var used by this method.

resolveConstants

protected void resolveConstants(ConstantPool cp)
                         throws ClassFileFormatException

Insert or check location of constant value on constant pool

Parameters:

cp - the constant pool for this class

Throws:

ClassFileFormatException

write

protected void write(ConstantPool cp,
                     DataOutput out)
              throws IOException,
                     ClassFileFormatException

Write this class into the the file (out) getting data position from the constant pool

Parameters:

cp - the constant pool that contain all data

out - the file where to write this object info

Throws:

IOException - an io problem has occured

ClassFileFormatException - attempt to write a bad classfile info