Class StackMap

java.lang.Object

org.apache.bcel.classfile.Attribute

org.apache.bcel.classfile.StackMap

All Implemented Interfaces:

Cloneable, Node

public final class StackMap
extends Attribute

This class represents a stack map attribute used for preverification of Java classes for the Java 2 Micro Edition (J2ME). This attribute is used by the KVM and contained within the Code attribute of a method. See CLDC specification �5.3.1.2

StackMapTable_attribute {
  u2              attribute_name_index;
  u4              attribute_length;
  u2              number_of_entries;
  stack_map_frame entries[number_of_entries];
}

See Also:

• Code
• StackMapEntry
• StackMapType

Field Summary

Fields inherited from class Attribute

constant_pool, EMPTY_ARRAY, length, name_index, tag

Constructor Summary

Constructors

Constructor	Description
StackMap(int nameIndex, int length, StackMapEntry[] table, ConstantPool constantPool)	Constructs a StackMap.

Method Summary

Modifier and Type	Method	Description
void	accept(Visitor v)	Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class.
Attribute	copy(ConstantPool constantPool)	Creates a deep copy of this attribute.
void	dump(DataOutputStream file)	Dumps stack map table attribute to file stream in binary format.
int	getMapLength()	Gets the map length.
StackMapEntry[]	getStackMap()	Gets the stack map.
void	setStackMap(StackMapEntry[] table)	Sets the stack map.
String	toString()

Methods inherited from class Attribute

addAttributeReader, addAttributeReader, clone, getConstantPool, getLength, getName, getNameIndex, getTag, println, readAttribute, readAttribute, removeAttributeReader, setConstantPool, setLength, setNameIndex

Methods inherited from class Object

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

Constructor Details

StackMap

public StackMap(int nameIndex,
 int length,
 StackMapEntry[] table,
 ConstantPool constantPool)

Constructs a StackMap.

Parameters:

nameIndex - Index of name.

length - Content length in bytes.

table - Table of stack map entries.

constantPool - Array of constants.

Method Details

accept

public void accept(Visitor v)

Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class. I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.

Specified by:

accept in interface Node

Specified by:

accept in class Attribute

Parameters:

v - Visitor object.

copy

public Attribute copy(ConstantPool constantPool)

Description copied from class: Attribute

Creates a deep copy of this attribute.

Specified by:

copy in class Attribute

Parameters:

constantPool - constant pool to save.

Returns:

deep copy of this attribute.

dump

public void dump(DataOutputStream file)
          throws IOException

Dumps stack map table attribute to file stream in binary format.

Overrides:

dump in class Attribute

Parameters:

file - Output file stream.

Throws:

IOException - Thrown if an I/O error occurs.

getMapLength

public int getMapLength()

Gets the map length.

Returns:

The map length.

getStackMap

public StackMapEntry[] getStackMap()

Gets the stack map.

Returns:

Array of stack map entries.

setStackMap

public void setStackMap(StackMapEntry[] table)

Sets the stack map.

Parameters:

table - Array of stack map entries.

toString

public String toString()

Overrides:

toString in class Attribute

Returns:

String representation.