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Class de.fub.bytecode.classfile.Code

java.lang.Object
   |
   +----de.fub.bytecode.classfile.Attribute
           |
           +----de.fub.bytecode.classfile.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 1.10 1999/07/09 15:54:26 dahm Exp $
Author:
M. Dahm
See Also:
Attribute, CodeException, LineNumberTable, LocalVariableTable

Constructor Index

 o Code(Code)
Initialize from another object.
 o Code(int, int, int, int, byte[], CodeException[], Attribute[], ConstantPool)

Method Index

 o accept(Visitor)
Called by objects that are traversing the nodes of the tree implicitely defined by the contents of a Java class.
 o copy(ConstantPool)
 o dump(DataOutputStream)
Dump code attribute to file stream in binary format.
 o getAttributes()
 o getCode()
 o getExceptionTable()
 o getLineNumberTable()
 o getLocalVariableTable()
 o getMaxLocals()
 o getMaxStack()
 o setAttributes(Attribute[])
 o setCode(byte[])
 o setExceptionTable(CodeException[])
 o setMaxLocals(int)
 o setMaxStack(int)
 o toString()
 o toString(boolean)

Constructors

 o 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.

 o 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

Methods

 o 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
 o dump
 public final void dump(DataOutputStream file) throws IOException
Dump code attribute to file stream in binary format.

Parameters:
file - Output file stream
Overrides:
dump in class Attribute
 o getAttributes
 public final Attribute[] getAttributes()
Returns:
Collection of code attributes.
See Also:
Attribute
 o getLineNumberTable
 public LineNumberTable getLineNumberTable()
Returns:
LineNumberTable of Code, if it has one
 o getLocalVariableTable
 public LocalVariableTable getLocalVariableTable()
Returns:
LocalVariableTable of Code, if it has one
 o getCode
 public final byte[] getCode()
Returns:
Actual byte code of the method.
 o getExceptionTable
 public final CodeException[] getExceptionTable()
Returns:
Table of handled exceptions.
See Also:
CodeException
 o getMaxLocals
 public final int getMaxLocals()
Returns:
Number of local variables.
 o getMaxStack
 public final int getMaxStack()
Returns:
Maximum size of stack used by this method.
 o setAttributes
 public final void setAttributes(Attribute attributes[])
 o setCode
 public final void setCode(byte code[])
Parameters:
code - byte code
 o setExceptionTable
 public final void setExceptionTable(CodeException exception_table[])
Parameters:
exception_table - exception table
 o setMaxLocals
 public final void setMaxLocals(int max_locals)
Parameters:
max_locals - maximum number of local variables
 o setMaxStack
 public final void setMaxStack(int max_stack)
Parameters:
max_stack - maximum stack size
 o toString
 public final String toString(boolean verbose)
Returns:
String representation of code chunk.
 o toString
 public final String toString()
Returns:
String representation of code chunk.
Overrides:
toString in class Attribute
 o copy
 public Attribute copy(ConstantPool constant_pool)
Returns:
deep copy of this attribute
Overrides:
copy in class Attribute

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