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Class espresso.classfile.javaclass.Code 

java.lang.Object
   |
   +----espresso.classfile.javaclass.Attribute
           |
           +----espresso.classfile.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.

See Also:
Attribute, CodeException, LineNumberTable, LocalVariableTable

Variable Index

o attributes
o attributes_count
o code
o code_length
o constant_pool
o exception_table
o exception_table_length
o max_locals
o max_stack

Constructor Index

o Code()
Empty constructor, all attributes have to be defined via `setXXX' methods.
o Code(Code)
Initialize from another object.
o Code(int, int, DataInputStream, ConstantPool)
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 dump(DataOutputStream)
Dump code attribute to file stream in binary format.
o getAttributes()
o getCode()
o getConstantPool()
o getExceptionTable()
o getMaxLocals()
o getMaxStack()
o setAttributes(Attribute[])
o setCode(byte[])
o setConstantPool(ConstantPool)
o setExceptionTable(CodeException[])
o setMaxLocals(int)
o setMaxStack(int)
o toString()

Variables

o max_stack 
 private int max_stack
o max_locals 
 private int max_locals
o code_length 
 private int code_length
o code 
 private byte code[]
o exception_table_length 
 private int exception_table_length
o exception_table 
 private CodeException exception_table[]
o attributes_count 
 private int attributes_count
o attributes 
 private Attribute attributes[]
o constant_pool 
 private ConstantPool constant_pool

Constructors

o Code 
 public Code()
Empty constructor, all attributes have to be defined via `setXXX' methods. Use at your own risk.

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 
 Code(int name_index,
      int length,
      DataInputStream file,
      ConstantPool constant_pool) throws IOException
Parameters:
name_index - Index pointing to the name Code
length - Content length in bytes
file - Input stream
constant_pool - Array of constants
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 getCode 
 public final byte[] getCode()
Returns:
Actual byte code of the method.
o getConstantPool 
 public final ConstantPool getConstantPool()
Returns:
Constant pool used by this object.
See Also:
ConstantPool
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 setConstantPool 
 public final void setConstantPool(ConstantPool constant_pool)
Parameters:
constant_pool - Constant pool to be used for this object.
See Also:
ConstantPool
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()
Returns:
String representation of code chunk.
Overrides:
toString in class Object 
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