org.objectweb.asm.attrs

Class SourceDebugExtensionAttribute

Known Direct Subclasses:
ASMSourceDebugExtensionAttribute

public class SourceDebugExtensionAttribute
extends Attribute

The SourceDebugExtension attribute is an optional attribute defined in JSR-045 in the attributes table of the ClassFile structure. There can be no more than one SourceDebugExtension attribute in the attributes table of a given ClassFile structure. The SourceDebugExtension attribute has the following format:
   SourceDebugExtension_attribute {
     u2 attribute_name_index;
     u4 attribute_length;
     u1 debug_extension[attribute_length];
   }
 
The items of the SourceDebugExtension_attribute structure are as follows:
Author:
Eugene Kuleshov
See Also:
JSR-045: Debugging Support for Other Languages

Field Summary

String
debugExtension

Fields inherited from class org.objectweb.asm.Attribute

next, type

Constructor Summary

SourceDebugExtensionAttribute()
SourceDebugExtensionAttribute(String debugExtension)
Constructs a new empty attribute.

Method Summary

protected Attribute
read(ClassReader cr, int off, int len, char[] buf, int codeOff, Label[] labels)
Reads a type attribute.
String
toString()
protected ByteVector
write(ClassWriter cw, byte[] code, int len, int maxStack, int maxLocals)
Returns the byte array form of this attribute.

Methods inherited from class org.objectweb.asm.Attribute

getLabels, isUnknown, read, write

Field Details

debugExtension

public String debugExtension

Constructor Details

SourceDebugExtensionAttribute

public SourceDebugExtensionAttribute()

SourceDebugExtensionAttribute

public SourceDebugExtensionAttribute(String debugExtension)
Constructs a new empty attribute.
Parameters:

Method Details

read

protected Attribute read(ClassReader cr,
                         int off,
                         int len,
                         char[] buf,
                         int codeOff,
                         Label[] labels)
Reads a type attribute. This method must return a new Attribute object, of type type, corresponding to the len bytes starting at the given offset, in the given class reader.
Overrides:
read in interface Attribute
Parameters:
cr - the class that contains the attribute to be read.
off - index of the first byte of the attribute's content in cr.b. The 6 attribute header bytes, containing the type and the length of the attribute, are not taken into account here.
len - the length of the attribute's content.
buf - buffer to be used to call readUTF8, readClass or readConst.
codeOff - index of the first byte of code's attribute content in cr.b, or -1 if the attribute to be read is not a code attribute. The 6 attribute header bytes, containing the type and the length of the attribute, are not taken into account here.
labels - the labels of the method's code, or null if the attribute to be read is not a code attribute.
Returns:
a new Attribute object corresponding to the given bytes.

toString

public String toString()

write

protected ByteVector write(ClassWriter cw,
                           byte[] code,
                           int len,
                           int maxStack,
                           int maxLocals)
Returns the byte array form of this attribute.
Overrides:
write in interface Attribute
Parameters:
cw - the class to which this attribute must be added. This parameter can be used to add to the constant pool of this class the items that corresponds to this attribute.
code - the bytecode of the method corresponding to this code attribute, or null if this attribute is not a code attributes.
len - the length of the bytecode of the method corresponding to this code attribute, or null if this attribute is not a code attribute.
maxStack - the maximum stack size of the method corresponding to this code attribute, or -1 if this attribute is not a code attribute.
maxLocals - the maximum number of local variables of the method corresponding to this code attribute, or -1 if this attribute is not a code attribute.
Returns:
the byte array form of this attribute.