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Class DE.fub.inf.JVM.JavaClass.Code

java.lang.Object
  |
  +--DE.fub.inf.JVM.JavaClass.Attribute
        |
        +--DE.fub.inf.JVM.JavaClass.Code

public final class Code
extends Attribute
This class is derived from Attribute and represents a code chunk. It is instantiated by the Attribute.readAttribute() method. A Code attribute contains informations about operand stack, local variables, byte code and the exceptions handled within this method. This attribute has attributes itself, namely LineNumberTable which is used for debugging purposes and LocalVariableTable which contains information about the local variables.

Version:
$Id: Code.java,v 1.3 1998/08/17 09:05:33 dahm Exp $
Author:
M. Dahm
See Also:
Attribute, CodeException, LineNumberTable, LocalVariableTable

Fields inherited from class DE.fub.inf.JVM.JavaClass.Attribute
constant_pool, length, name_index, tag
 
Constructor Summary
Code(Code c)
          Initialize from another object.
Code(int name_index, int length, int max_stack, int max_locals, byte[] code, CodeException[] exception_table, Attribute[] attributes, ConstantPool constant_pool)
           
 
Method Summary
void accept(Visitor v)
          Called by objects that are traversing the nodes of the tree implicitely defined by the contents of a Java class.
Attribute copy(ConstantPool constant_pool)
           
void dump(java.io.DataOutputStream file)
          Dump code attribute to file stream in binary format.
Attribute[] getAttributes()
           
byte[] getCode()
           
CodeException[] getExceptionTable()
           
LineNumberTable getLineNumberTable()
           
LocalVariableTable getLocalVariableTable()
           
int getMaxLocals()
           
int getMaxStack()
           
void setAttributes(Attribute[] attributes)
           
void setCode(byte[] code)
           
void setExceptionTable(CodeException[] exception_table)
           
void setMaxLocals(int max_locals)
           
void setMaxStack(int max_stack)
           
java.lang.String toString()
           
 
Methods inherited from class DE.fub.inf.JVM.JavaClass.Attribute
accept, clone, copy, dump, getConstantPool, getLength, getNameIndex, getTag, setConstantPool, setLength, setNameIndex, toString
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notifyAll, notify, toString, wait, wait, wait
 

Constructor Detail

Code

public Code(Code c)
Initialize from another object. Note that both objects use the same references (shallow copy). Use clone() for a physical copy.

Code

public Code(int name_index,
            int length,
            int max_stack,
            int max_locals,
            byte[] code,
            CodeException[] exception_table,
            Attribute[] attributes,
            ConstantPool constant_pool)
Parameters:
name_index - Index pointing to the name Code
length - Content length in bytes
max_stack - Maximum size of stack
max_locals - Number of local variables
code - Actual byte code
exception_table - Table of handled exceptions
attributes - Attributes of code: LineNumber or LocalVariable
constant_pool - Array of constants
Method Detail

accept

public void accept(Visitor v)
Called by objects that are traversing the nodes of the tree implicitely defined by the contents of a Java class. I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
Parameters:
v - Visitor object
Overrides:
accept in class Attribute

dump

public final void dump(java.io.DataOutputStream file)
               throws java.io.IOException
Dump code attribute to file stream in binary format.
Parameters:
file - Output file stream
Overrides:
dump in class Attribute

getAttributes

public final Attribute[] getAttributes()
Returns:
Collection of code attributes.
See Also:
Attribute

getLineNumberTable

public LineNumberTable getLineNumberTable()
Returns:
LineNumberTable of Code, if it has one

getLocalVariableTable

public LocalVariableTable getLocalVariableTable()
Returns:
LocalVariableTable of Code, if it has one

getCode

public final byte[] getCode()
Returns:
Actual byte code of the method.

getExceptionTable

public final CodeException[] getExceptionTable()
Returns:
Table of handled exceptions.
See Also:
CodeException

getMaxLocals

public final int getMaxLocals()
Returns:
Number of local variables.

getMaxStack

public final int getMaxStack()
Returns:
Maximum size of stack used by this method.

setAttributes

public final void setAttributes(Attribute[] attributes)
Parameters:
attributes. -  

setCode

public final void setCode(byte[] code)
Parameters:
code - byte code

setExceptionTable

public final void setExceptionTable(CodeException[] exception_table)
Parameters:
exception_table - exception table

setMaxLocals

public final void setMaxLocals(int max_locals)
Parameters:
max_locals - maximum number of local variables

setMaxStack

public final void setMaxStack(int max_stack)
Parameters:
max_stack - maximum stack size

toString

public final java.lang.String toString()
Returns:
String representation of code chunk.
Overrides:
toString in class Attribute

copy

public Attribute copy(ConstantPool constant_pool)
Returns:
deep copy of this attribute
Overrides:
copy in class Attribute

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