public class Attribute extends Object
Modifier and Type | Field and Description |
---|---|
String |
type
The type of this attribute, also called its name in the JVMS.
|
Modifier | Constructor and Description |
---|---|
protected |
Attribute(String type)
Constructs a new empty attribute.
|
Modifier and Type | Method and Description |
---|---|
protected Label[] |
getLabels()
Returns the labels corresponding to this attribute.
|
boolean |
isCodeAttribute()
Returns true if this type of attribute is a Code attribute.
|
boolean |
isUnknown()
Returns true if this type of attribute is unknown.
|
protected Attribute |
read(ClassReader classReader,
int offset,
int length,
char[] charBuffer,
int codeAttributeOffset,
Label[] labels)
Reads a
type attribute. |
protected ByteVector |
write(ClassWriter classWriter,
byte[] code,
int codeLength,
int maxStack,
int maxLocals)
Returns the byte array form of the content of this attribute.
|
public final String type
protected Attribute(String type)
type
- the type of the attribute.public boolean isUnknown()
public boolean isCodeAttribute()
protected Label[] getLabels()
protected Attribute read(ClassReader classReader, int offset, int length, char[] charBuffer, int codeAttributeOffset, Label[] labels)
type
attribute. This method must return a new Attribute
object,
of type type
, corresponding to the 'length' bytes starting at 'offset', in the given
ClassReader.classReader
- the class that contains the attribute to be read.offset
- index of the first byte of the attribute's content in ClassReader
. The 6
attribute header bytes (attribute_name_index and attribute_length) are not taken into
account here.length
- the length of the attribute's content (excluding the 6 attribute header bytes).charBuffer
- the buffer to be used to call the ClassReader methods requiring a
'charBuffer' parameter.codeAttributeOffset
- index of the first byte of content of the enclosing Code attribute
in ClassReader
, or -1 if the attribute to be read is not a Code attribute. The 6
attribute header bytes (attribute_name_index and attribute_length) 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.Attribute
object corresponding to the specified bytes.protected ByteVector write(ClassWriter classWriter, byte[] code, int codeLength, int maxStack, int maxLocals)
classWriter
- the class to which this attribute must be added. This parameter can be used
to add the items that corresponds to this attribute to the constant pool of this class.code
- the bytecode of the method corresponding to this Code attribute, or null
if this attribute is not a Code attribute. Corresponds to the 'code' field of the Code
attribute.codeLength
- the length of the bytecode of the method corresponding to this code
attribute, or 0 if this attribute is not a Code attribute. Corresponds to the 'code_length'
field of the 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.Copyright © 2007-2023, Oracle and/or its affiliates. All Rights Reserved. Use is subject to license terms.