Package org.eclipse.sisu.space.asm

Class Attribute

java.lang.Object
org.eclipse.sisu.space.asm.Attribute
final class Attribute extends Object
A non standard class, field, method or code attribute.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    (package private) Attribute
    next
    The next attribute in this attribute list.
    final String
    type
    The type of this attribute.
    (package private) byte[]
    value
    The raw value of this attribute, used only for unknown attributes.

  • Constructor Summary

    Constructors
    Modifier
    Constructor
    Description
    protected
    Attribute(String type)
    Constructs a new empty attribute.

  • Method Summary

    Modifier and Type
    Method
    Description
    (package private) final int
    getCount()
    Returns the length of the attribute list that begins with this attribute.
    protected Label[]
    getLabels()
    Returns the labels corresponding to this attribute.
    (package private) final int
    getSize(ClassWriter cw, byte[] code, int len, int maxStack, int maxLocals)
    Returns the size of all the attributes in this attribute list.
    boolean
    isCodeAttribute()
    Returns true if this type of attribute is a code attribute.
    boolean
    isUnknown()
    Returns true if this type of attribute is unknown.
    (package private) final void
    put(ClassWriter cw, byte[] code, int len, int maxStack, int maxLocals, ByteVector out)
    Writes all the attributes of this attribute list in the given byte vector.
    protected Attribute
    read(ClassReader cr, int off, int len, char[] buf, int codeOff, Label[] labels)
    Reads a type attribute.
    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 java.lang.Object

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

  • Field Details

    • type

      public final String type
      The type of this attribute.

    • value

      byte[] value
      The raw value of this attribute, used only for unknown attributes.

    • next

      Attribute next
      The next attribute in this attribute list. May be null.

  • Constructor Details

    • Attribute

      protected Attribute(String type)
      Constructs a new empty attribute.
      Parameters:
      type - the type of the attribute.

  • Method Details

    • isUnknown

      public boolean isUnknown()
      Returns true if this type of attribute is unknown. The default implementation of this method always returns true.
      Returns:
      true if this type of attribute is unknown.

    • isCodeAttribute

      public boolean isCodeAttribute()
      Returns true if this type of attribute is a code attribute.
      Returns:
      true if this type of attribute is a code attribute.

    • getLabels

      protected Label[] getLabels()
      Returns the labels corresponding to this attribute.
      Returns:
      the labels corresponding to this attribute, or null if this attribute is not a code attribute that contains labels.

    • 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.
      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.

    • write

      protected ByteVector write(ClassWriter cw, byte[] code, int len, int maxStack, int maxLocals)
      Returns the byte array form of this 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.

    • getCount

      final int getCount()
      Returns the length of the attribute list that begins with this attribute.
      Returns:
      the length of the attribute list that begins with this attribute.

    • getSize

      final int getSize(ClassWriter cw, byte[] code, int len, int maxStack, int maxLocals)
      Returns the size of all the attributes in this attribute list.
      Parameters:
      cw - the class writer to be used to convert the attributes into byte arrays, with the write method.
      code - the bytecode of the method corresponding to these code attributes, or null if these attributes are not code attributes.
      len - the length of the bytecode of the method corresponding to these code attributes, or null if these attributes are not code attributes.
      maxStack - the maximum stack size of the method corresponding to these code attributes, or -1 if these attributes are not code attributes.
      maxLocals - the maximum number of local variables of the method corresponding to these code attributes, or -1 if these attributes are not code attributes.
      Returns:
      the size of all the attributes in this attribute list. This size includes the size of the attribute headers.

    • put

      final void put(ClassWriter cw, byte[] code, int len, int maxStack, int maxLocals, ByteVector out)
      Writes all the attributes of this attribute list in the given byte vector.
      Parameters:
      cw - the class writer to be used to convert the attributes into byte arrays, with the write method.
      code - the bytecode of the method corresponding to these code attributes, or null if these attributes are not code attributes.
      len - the length of the bytecode of the method corresponding to these code attributes, or null if these attributes are not code attributes.
      maxStack - the maximum stack size of the method corresponding to these code attributes, or -1 if these attributes are not code attributes.
      maxLocals - the maximum number of local variables of the method corresponding to these code attributes, or -1 if these attributes are not code attributes.
      out - where the attributes must be written.